diff --git a/Android.bp b/Android.bp
index c9a48b4..1b68adb 100644
--- a/Android.bp
+++ b/Android.bp
@@ -55,8 +55,10 @@
         "android/mutator.go",
         "android/namespace.go",
         "android/neverallow.go",
+        "android/notices.go",
         "android/onceper.go",
         "android/override_module.go",
+        "android/package.go",
         "android/package_ctx.go",
         "android/path_properties.go",
         "android/paths.go",
@@ -78,12 +80,16 @@
         "android/env.go",
     ],
     testSrcs: [
+        "android/android_test.go",
         "android/arch_test.go",
         "android/config_test.go",
         "android/expand_test.go",
+        "android/module_test.go",
+        "android/mutator_test.go",
         "android/namespace_test.go",
         "android/neverallow_test.go",
         "android/onceper_test.go",
+        "android/package_test.go",
         "android/path_properties_test.go",
         "android/paths_test.go",
         "android/prebuilt_test.go",
@@ -293,6 +299,7 @@
         "java/jdeps_test.go",
         "java/kotlin_test.go",
         "java/plugin_test.go",
+        "java/robolectric_test.go",
         "java/sdk_test.go",
     ],
     pluginFor: ["soong_build"],
diff --git a/OWNERS b/OWNERS
index 85c70df..4ae045d 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,5 @@
-per-file * = asmundak@google.com,ccross@android.com,dwillemsen@google.com,jungjw@google.com
+per-file * = asmundak@google.com,ccross@android.com,dwillemsen@google.com,jungjw@google.com,paulduffin@google.com
+
 per-file ndk_*.go, *gen_stub_libs.py = danalbert@google.com
 per-file clang.go,global.go = srhines@google.com, chh@google.com, pirama@google.com, yikong@google.com
 per-file tidy.go = srhines@google.com, chh@google.com
diff --git a/README.md b/README.md
index 8fdce4b..ebbe8bc 100644
--- a/README.md
+++ b/README.md
@@ -133,6 +133,25 @@
 
 This is based on the Bazel package concept.
 
+The `package` module type allows information to be specified about a package. Only a single
+`package` module can be specified per package and in the case where there are multiple `.bp` files
+in the same package directory it is highly recommended that the `package` module (if required) is
+specified in the `Android.bp` file.
+
+Unlike most module type `package` does not have a `name` property. Instead the name is set to the
+name of the package, e.g. if the package is in `top/intermediate/package` then the package name is
+`//top/intermediate/package`.
+
+E.g. The following will set the default visibility for all the modules defined in the package and
+any subpackages that do not set their own default visibility (irrespective of whether they are in
+the same `.bp` file as the `package` module) to be visible to all the subpackages by default.
+
+```
+package {
+    default_visibility: [":__subpackages"]
+}
+```
+
 ### Name resolution
 
 Soong provides the ability for modules in different directories to specify
@@ -191,13 +210,13 @@
 `//independent:evil`)
 * `["//project"]`: This is shorthand for `["//project:__pkg__"]`
 * `[":__subpackages__"]`: This is shorthand for `["//project:__subpackages__"]`
-where `//project` is the module's package. e.g. using `[":__subpackages__"]` in
+where `//project` is the module's package, e.g. using `[":__subpackages__"]` in
 `packages/apps/Settings/Android.bp` is equivalent to
 `//packages/apps/Settings:__subpackages__`.
 * `["//visibility:legacy_public"]`: The default visibility, behaves as
 `//visibility:public` for now. It is an error if it is used in a module.
 
-The visibility rules of `//visibility:public` and `//visibility:private` can not
+The visibility rules of `//visibility:public` and `//visibility:private` cannot
 be combined with any other visibility specifications, except
 `//visibility:public` is allowed to override visibility specifications imported
 through the `defaults` property.
@@ -207,13 +226,22 @@
 say `vendor/google`, instead it must make itself visible to all packages within
 `vendor/` using `//vendor:__subpackages__`.
 
-If a module does not specify the `visibility` property the module is
-`//visibility:legacy_public`. Once the build has been completely switched over to
-soong it is possible that a global refactoring will be done to change this to
-`//visibility:private` at which point all modules that do not currently specify
-a `visibility` property will be updated to have
-`visibility = [//visibility:legacy_public]` added. It will then be the owner's
-responsibility to replace that with a more appropriate visibility.
+If a module does not specify the `visibility` property then it uses the
+`default_visibility` property of the `package` module in the module's package.
+
+If the `default_visibility` property is not set for the module's package then
+it will use the `default_visibility` of its closest ancestor package for which
+a `default_visibility` property is specified.
+
+If no `default_visibility` property can be found then the module uses the
+global default of `//visibility:legacy_public`.
+
+Once the build has been completely switched over to soong it is possible that a
+global refactoring will be done to change this to `//visibility:private` at
+which point all packages that do not currently specify a `default_visibility`
+property will be updated to have
+`default_visibility = [//visibility:legacy_public]` added. It will then be the
+owner's responsibility to replace that with a more appropriate visibility.
 
 ### Formatter
 
diff --git a/android/android_test.go b/android/android_test.go
new file mode 100644
index 0000000..46b7054
--- /dev/null
+++ b/android/android_test.go
@@ -0,0 +1,46 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+var buildDir string
+
+func setUp() {
+	var err error
+	buildDir, err = ioutil.TempDir("", "soong_android_test")
+	if err != nil {
+		panic(err)
+	}
+}
+
+func tearDown() {
+	os.RemoveAll(buildDir)
+}
+
+func TestMain(m *testing.M) {
+	run := func() int {
+		setUp()
+		defer tearDown()
+
+		return m.Run()
+	}
+
+	os.Exit(run())
+}
diff --git a/android/apex.go b/android/apex.go
index bf11ba2..17df762 100644
--- a/android/apex.go
+++ b/android/apex.go
@@ -15,6 +15,7 @@
 package android
 
 import (
+	"sort"
 	"sync"
 
 	"github.com/google/blueprint"
@@ -86,7 +87,9 @@
 	ApexProperties ApexProperties
 
 	canHaveApexVariants bool
-	apexVariations      []string
+
+	apexVariationsLock sync.Mutex // protects apexVariations during parallel apexDepsMutator
+	apexVariations     []string
 }
 
 func (m *ApexModuleBase) apexModuleBase() *ApexModuleBase {
@@ -94,6 +97,8 @@
 }
 
 func (m *ApexModuleBase) BuildForApex(apexName string) {
+	m.apexVariationsLock.Lock()
+	defer m.apexVariationsLock.Unlock()
 	if !InList(apexName, m.apexVariations) {
 		m.apexVariations = append(m.apexVariations, apexName)
 	}
@@ -122,6 +127,7 @@
 
 func (m *ApexModuleBase) CreateApexVariations(mctx BottomUpMutatorContext) []blueprint.Module {
 	if len(m.apexVariations) > 0 {
+		sort.Strings(m.apexVariations)
 		variations := []string{""} // Original variation for platform
 		variations = append(variations, m.apexVariations...)
 
diff --git a/android/api_levels.go b/android/api_levels.go
index 51d4703..961685a 100644
--- a/android/api_levels.go
+++ b/android/api_levels.go
@@ -85,7 +85,7 @@
 // * Numeric API levels are simply converted.
 // * "minimum" and "current" are not currently handled since the former is
 //   NDK specific and the latter has inconsistent meaning.
-func ApiStrToNum(ctx BaseContext, apiLevel string) (int, error) {
+func ApiStrToNum(ctx BaseModuleContext, apiLevel string) (int, error) {
 	num, ok := getApiLevelsMap(ctx.Config())[apiLevel]
 	if ok {
 		return num, nil
diff --git a/android/arch.go b/android/arch.go
index 68fc149..46e582c 100644
--- a/android/arch.go
+++ b/android/arch.go
@@ -710,10 +710,10 @@
 //    - The HostOrDeviceSupported value passed in to InitAndroidArchModule by the module type factory, which selects
 //      whether the module type can compile for host, device or both.
 //    - The host_supported and device_supported properties on the module.
-// If host is supported for the module, the Host and HostCross OsClasses are  are selected.  If device is supported
+// If host is supported for the module, the Host and HostCross OsClasses are selected.  If device is supported
 // for the module, the Device OsClass is selected.
 // Within each selected OsClass, the multilib selection is determined by:
-//    - The compile_multilib property if it set (which may be overriden by target.android.compile_multlib or
+//    - The compile_multilib property if it set (which may be overridden by target.android.compile_multilib or
 //      target.host.compile_multilib).
 //    - The default multilib passed to InitAndroidArchModule if compile_multilib was not set.
 // Valid multilib values include:
@@ -1129,7 +1129,7 @@
 
 var variantReplacer = strings.NewReplacer("-", "_", ".", "_")
 
-func (a *ModuleBase) appendProperties(ctx BottomUpMutatorContext,
+func (m *ModuleBase) appendProperties(ctx BottomUpMutatorContext,
 	dst interface{}, src reflect.Value, field, srcPrefix string) reflect.Value {
 
 	src = src.FieldByName(field)
@@ -1167,16 +1167,16 @@
 }
 
 // Rewrite the module's properties structs to contain arch-specific values.
-func (a *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
-	arch := a.Arch()
-	os := a.Os()
+func (m *ModuleBase) setArchProperties(ctx BottomUpMutatorContext) {
+	arch := m.Arch()
+	os := m.Os()
 
-	for i := range a.generalProperties {
-		genProps := a.generalProperties[i]
-		if a.archProperties[i] == nil {
+	for i := range m.generalProperties {
+		genProps := m.generalProperties[i]
+		if m.archProperties[i] == nil {
 			continue
 		}
-		for _, archProperties := range a.archProperties[i] {
+		for _, archProperties := range m.archProperties[i] {
 			archPropValues := reflect.ValueOf(archProperties).Elem()
 
 			archProp := archPropValues.FieldByName("Arch")
@@ -1197,7 +1197,7 @@
 			if arch.ArchType != Common {
 				field := proptools.FieldNameForProperty(t.Name)
 				prefix := "arch." + t.Name
-				archStruct := a.appendProperties(ctx, genProps, archProp, field, prefix)
+				archStruct := m.appendProperties(ctx, genProps, archProp, field, prefix)
 
 				// Handle arch-variant-specific properties in the form:
 				// arch: {
@@ -1209,7 +1209,7 @@
 				if v != "" {
 					field := proptools.FieldNameForProperty(v)
 					prefix := "arch." + t.Name + "." + v
-					a.appendProperties(ctx, genProps, archStruct, field, prefix)
+					m.appendProperties(ctx, genProps, archStruct, field, prefix)
 				}
 
 				// Handle cpu-variant-specific properties in the form:
@@ -1223,7 +1223,7 @@
 					if c != "" {
 						field := proptools.FieldNameForProperty(c)
 						prefix := "arch." + t.Name + "." + c
-						a.appendProperties(ctx, genProps, archStruct, field, prefix)
+						m.appendProperties(ctx, genProps, archStruct, field, prefix)
 					}
 				}
 
@@ -1236,7 +1236,7 @@
 				for _, feature := range arch.ArchFeatures {
 					field := proptools.FieldNameForProperty(feature)
 					prefix := "arch." + t.Name + "." + feature
-					a.appendProperties(ctx, genProps, archStruct, field, prefix)
+					m.appendProperties(ctx, genProps, archStruct, field, prefix)
 				}
 
 				// Handle multilib-specific properties in the form:
@@ -1247,7 +1247,7 @@
 				// },
 				field = proptools.FieldNameForProperty(t.Multilib)
 				prefix = "multilib." + t.Multilib
-				a.appendProperties(ctx, genProps, multilibProp, field, prefix)
+				m.appendProperties(ctx, genProps, multilibProp, field, prefix)
 			}
 
 			// Handle host-specific properties in the form:
@@ -1259,7 +1259,7 @@
 			if os.Class == Host || os.Class == HostCross {
 				field = "Host"
 				prefix = "target.host"
-				a.appendProperties(ctx, genProps, targetProp, field, prefix)
+				m.appendProperties(ctx, genProps, targetProp, field, prefix)
 			}
 
 			// Handle target OS generalities of the form:
@@ -1274,24 +1274,24 @@
 			if os.Linux() {
 				field = "Linux"
 				prefix = "target.linux"
-				a.appendProperties(ctx, genProps, targetProp, field, prefix)
+				m.appendProperties(ctx, genProps, targetProp, field, prefix)
 
 				if arch.ArchType != Common {
 					field = "Linux_" + arch.ArchType.Name
 					prefix = "target.linux_" + arch.ArchType.Name
-					a.appendProperties(ctx, genProps, targetProp, field, prefix)
+					m.appendProperties(ctx, genProps, targetProp, field, prefix)
 				}
 			}
 
 			if os.Bionic() {
 				field = "Bionic"
 				prefix = "target.bionic"
-				a.appendProperties(ctx, genProps, targetProp, field, prefix)
+				m.appendProperties(ctx, genProps, targetProp, field, prefix)
 
 				if arch.ArchType != Common {
 					field = "Bionic_" + t.Name
 					prefix = "target.bionic_" + t.Name
-					a.appendProperties(ctx, genProps, targetProp, field, prefix)
+					m.appendProperties(ctx, genProps, targetProp, field, prefix)
 				}
 			}
 
@@ -1321,18 +1321,18 @@
 			// },
 			field = os.Field
 			prefix = "target." + os.Name
-			a.appendProperties(ctx, genProps, targetProp, field, prefix)
+			m.appendProperties(ctx, genProps, targetProp, field, prefix)
 
 			if arch.ArchType != Common {
 				field = os.Field + "_" + t.Name
 				prefix = "target." + os.Name + "_" + t.Name
-				a.appendProperties(ctx, genProps, targetProp, field, prefix)
+				m.appendProperties(ctx, genProps, targetProp, field, prefix)
 			}
 
 			if (os.Class == Host || os.Class == HostCross) && os != Windows {
 				field := "Not_windows"
 				prefix := "target.not_windows"
-				a.appendProperties(ctx, genProps, targetProp, field, prefix)
+				m.appendProperties(ctx, genProps, targetProp, field, prefix)
 			}
 
 			// Handle 64-bit device properties in the form:
@@ -1352,11 +1352,11 @@
 				if ctx.Config().Android64() {
 					field := "Android64"
 					prefix := "target.android64"
-					a.appendProperties(ctx, genProps, targetProp, field, prefix)
+					m.appendProperties(ctx, genProps, targetProp, field, prefix)
 				} else {
 					field := "Android32"
 					prefix := "target.android32"
-					a.appendProperties(ctx, genProps, targetProp, field, prefix)
+					m.appendProperties(ctx, genProps, targetProp, field, prefix)
 				}
 
 				if (arch.ArchType == X86 && (hasArmAbi(arch) ||
@@ -1365,7 +1365,7 @@
 						hasX86AndroidArch(ctx.Config().Targets[Android])) {
 					field := "Arm_on_x86"
 					prefix := "target.arm_on_x86"
-					a.appendProperties(ctx, genProps, targetProp, field, prefix)
+					m.appendProperties(ctx, genProps, targetProp, field, prefix)
 				}
 				if (arch.ArchType == X86_64 && (hasArmAbi(arch) ||
 					hasArmAndroidArch(ctx.Config().Targets[Android]))) ||
@@ -1373,7 +1373,7 @@
 						hasX8664AndroidArch(ctx.Config().Targets[Android])) {
 					field := "Arm_on_x86_64"
 					prefix := "target.arm_on_x86_64"
-					a.appendProperties(ctx, genProps, targetProp, field, prefix)
+					m.appendProperties(ctx, genProps, targetProp, field, prefix)
 				}
 			}
 		}
diff --git a/android/config.go b/android/config.go
index b0d8b7f..e4012fa 100644
--- a/android/config.go
+++ b/android/config.go
@@ -216,6 +216,7 @@
 			AAPTPreferredConfig:         stringPtr("xhdpi"),
 			AAPTCharacteristics:         stringPtr("nosdcard"),
 			AAPTPrebuiltDPI:             []string{"xhdpi", "xxhdpi"},
+			UncompressPrivAppDex:        boolPtr(true),
 		},
 
 		buildDir:     buildDir,
diff --git a/android/defaults.go b/android/defaults.go
index d4fbf48..844b4d4 100644
--- a/android/defaults.go
+++ b/android/defaults.go
@@ -80,6 +80,9 @@
 	return d.defaultableProperties
 }
 
+func (d *DefaultsModuleBase) GenerateAndroidBuildActions(ctx ModuleContext) {
+}
+
 func InitDefaultsModule(module DefaultableModule) {
 	module.AddProperties(
 		&hostAndDeviceProperties{},
diff --git a/android/defaults_test.go b/android/defaults_test.go
new file mode 100644
index 0000000..fa26595
--- /dev/null
+++ b/android/defaults_test.go
@@ -0,0 +1,116 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import (
+	"testing"
+
+	"github.com/google/blueprint/proptools"
+)
+
+type defaultsTestProperties struct {
+	Foo []string
+}
+
+type defaultsTestModule struct {
+	ModuleBase
+	DefaultableModuleBase
+	properties defaultsTestProperties
+}
+
+func (d *defaultsTestModule) GenerateAndroidBuildActions(ctx ModuleContext) {
+	ctx.Build(pctx, BuildParams{
+		Rule:   Touch,
+		Output: PathForModuleOut(ctx, "out"),
+	})
+}
+
+func defaultsTestModuleFactory() Module {
+	module := &defaultsTestModule{}
+	module.AddProperties(&module.properties)
+	InitDefaultableModule(module)
+	InitAndroidModule(module)
+	return module
+}
+
+type defaultsTestDefaults struct {
+	ModuleBase
+	DefaultsModuleBase
+}
+
+func defaultsTestDefaultsFactory() Module {
+	defaults := &defaultsTestDefaults{}
+	defaults.AddProperties(&defaultsTestProperties{})
+	InitDefaultsModule(defaults)
+	return defaults
+}
+
+func TestDefaultsAllowMissingDependencies(t *testing.T) {
+	config := TestConfig(buildDir, nil)
+	config.TestProductVariables.Allow_missing_dependencies = proptools.BoolPtr(true)
+
+	ctx := NewTestContext()
+	ctx.SetAllowMissingDependencies(true)
+
+	ctx.RegisterModuleType("test", ModuleFactoryAdaptor(defaultsTestModuleFactory))
+	ctx.RegisterModuleType("defaults", ModuleFactoryAdaptor(defaultsTestDefaultsFactory))
+
+	ctx.PreArchMutators(RegisterDefaultsPreArchMutators)
+
+	ctx.Register()
+
+	bp := `
+		defaults {
+			name: "defaults",
+			defaults: ["missing"],
+			foo: ["defaults"],
+		}
+
+		test {
+			name: "missing_defaults",
+			defaults: ["missing"],
+			foo: ["module"],
+		}
+
+		test {
+			name: "missing_transitive_defaults",
+			defaults: ["defaults"],
+			foo: ["module"],
+		}
+	`
+
+	ctx.MockFileSystem(map[string][]byte{
+		"Android.bp": []byte(bp),
+	})
+
+	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
+	FailIfErrored(t, errs)
+	_, errs = ctx.PrepareBuildActions(config)
+	FailIfErrored(t, errs)
+
+	missingDefaults := ctx.ModuleForTests("missing_defaults", "").Output("out")
+	missingTransitiveDefaults := ctx.ModuleForTests("missing_transitive_defaults", "").Output("out")
+
+	if missingDefaults.Rule != ErrorRule {
+		t.Errorf("expected missing_defaults rule to be ErrorRule, got %#v", missingDefaults.Rule)
+	}
+
+	if g, w := missingDefaults.Args["error"], "module missing_defaults missing dependencies: missing\n"; g != w {
+		t.Errorf("want error %q, got %q", w, g)
+	}
+
+	// TODO: missing transitive defaults is currently not handled
+	_ = missingTransitiveDefaults
+}
diff --git a/android/hooks.go b/android/hooks.go
index d55678e..2d2f797 100644
--- a/android/hooks.go
+++ b/android/hooks.go
@@ -27,7 +27,7 @@
 // been applied.
 type LoadHookContext interface {
 	// TODO: a new context that includes Config() but not Target(), etc.?
-	BaseContext
+	BaseModuleContext
 	AppendProperties(...interface{})
 	PrependProperties(...interface{})
 	CreateModule(blueprint.ModuleFactory, ...interface{})
@@ -36,7 +36,7 @@
 // Arch hooks are run after the module has been split into architecture variants, and can be used
 // to add architecture-specific properties.
 type ArchHookContext interface {
-	BaseContext
+	BaseModuleContext
 	AppendProperties(...interface{})
 	PrependProperties(...interface{})
 }
@@ -129,18 +129,18 @@
 
 func LoadHookMutator(ctx TopDownMutatorContext) {
 	if m, ok := ctx.Module().(Module); ok {
-		// Cast through *androidTopDownMutatorContext because AppendProperties is implemented
-		// on *androidTopDownMutatorContext but not exposed through TopDownMutatorContext
-		var loadHookCtx LoadHookContext = ctx.(*androidTopDownMutatorContext)
+		// Cast through *topDownMutatorContext because AppendProperties is implemented
+		// on *topDownMutatorContext but not exposed through TopDownMutatorContext
+		var loadHookCtx LoadHookContext = ctx.(*topDownMutatorContext)
 		m.base().hooks.runLoadHooks(loadHookCtx, m.base())
 	}
 }
 
 func archHookMutator(ctx TopDownMutatorContext) {
 	if m, ok := ctx.Module().(Module); ok {
-		// Cast through *androidTopDownMutatorContext because AppendProperties is implemented
-		// on *androidTopDownMutatorContext but not exposed through TopDownMutatorContext
-		var archHookCtx ArchHookContext = ctx.(*androidTopDownMutatorContext)
+		// Cast through *topDownMutatorContext because AppendProperties is implemented
+		// on *topDownMutatorContext but not exposed through TopDownMutatorContext
+		var archHookCtx ArchHookContext = ctx.(*topDownMutatorContext)
 		m.base().hooks.runArchHooks(archHookCtx, m.base())
 	}
 }
diff --git a/android/module.go b/android/module.go
index 1c36279..43b8763 100644
--- a/android/module.go
+++ b/android/module.go
@@ -18,7 +18,6 @@
 	"fmt"
 	"path"
 	"path/filepath"
-	"sort"
 	"strings"
 	"text/scanner"
 
@@ -56,7 +55,61 @@
 
 type ModuleBuildParams BuildParams
 
-type androidBaseContext interface {
+// BaseModuleContext is the same as blueprint.BaseModuleContext except that Config() returns
+// a Config instead of an interface{}, and some methods have been wrapped to use an android.Module
+// instead of a blueprint.Module, plus some extra methods that return Android-specific information
+// about the current module.
+type BaseModuleContext interface {
+	Module() Module
+	ModuleName() string
+	ModuleDir() string
+	ModuleType() string
+	Config() Config
+
+	OtherModuleName(m blueprint.Module) string
+	OtherModuleDir(m blueprint.Module) string
+	OtherModuleErrorf(m blueprint.Module, fmt string, args ...interface{})
+	OtherModuleDependencyTag(m blueprint.Module) blueprint.DependencyTag
+	OtherModuleExists(name string) bool
+
+	GetDirectDepsWithTag(tag blueprint.DependencyTag) []Module
+	GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module
+	GetDirectDep(name string) (blueprint.Module, blueprint.DependencyTag)
+
+	VisitDirectDepsBlueprint(visit func(blueprint.Module))
+	VisitDirectDeps(visit func(Module))
+	VisitDirectDepsWithTag(tag blueprint.DependencyTag, visit func(Module))
+	VisitDirectDepsIf(pred func(Module) bool, visit func(Module))
+	// Deprecated: use WalkDeps instead to support multiple dependency tags on the same module
+	VisitDepsDepthFirst(visit func(Module))
+	// Deprecated: use WalkDeps instead to support multiple dependency tags on the same module
+	VisitDepsDepthFirstIf(pred func(Module) bool, visit func(Module))
+	WalkDeps(visit func(Module, Module) bool)
+	WalkDepsBlueprint(visit func(blueprint.Module, blueprint.Module) bool)
+	// GetWalkPath is supposed to be called in visit function passed in WalkDeps()
+	// and returns a top-down dependency path from a start module to current child module.
+	GetWalkPath() []Module
+
+	ContainsProperty(name string) bool
+	Errorf(pos scanner.Position, fmt string, args ...interface{})
+	ModuleErrorf(fmt string, args ...interface{})
+	PropertyErrorf(property, fmt string, args ...interface{})
+	Failed() bool
+
+	// GlobWithDeps returns a list of files that match the specified pattern but do not match any
+	// of the patterns in excludes.  It also adds efficient dependencies to rerun the primary
+	// builder whenever a file matching the pattern as added or removed, without rerunning if a
+	// file that does not match the pattern is added to a searched directory.
+	GlobWithDeps(pattern string, excludes []string) ([]string, error)
+
+	Glob(globPattern string, excludes []string) Paths
+	GlobFiles(globPattern string, excludes []string) Paths
+
+	Fs() pathtools.FileSystem
+	AddNinjaFileDeps(deps ...string)
+
+	AddMissingDependencies(missingDeps []string)
+
 	Target() Target
 	TargetPrimary() bool
 	MultiTargets() []Target
@@ -78,37 +131,12 @@
 	DeviceConfig() DeviceConfig
 }
 
+// Deprecated: use BaseModuleContext instead
 type BaseContext interface {
 	BaseModuleContext
-	androidBaseContext
-}
-
-// BaseModuleContext is the same as blueprint.BaseModuleContext except that Config() returns
-// a Config instead of an interface{}.
-type BaseModuleContext interface {
-	ModuleName() string
-	ModuleDir() string
-	ModuleType() string
-	Config() Config
-
-	ContainsProperty(name string) bool
-	Errorf(pos scanner.Position, fmt string, args ...interface{})
-	ModuleErrorf(fmt string, args ...interface{})
-	PropertyErrorf(property, fmt string, args ...interface{})
-	Failed() bool
-
-	// GlobWithDeps returns a list of files that match the specified pattern but do not match any
-	// of the patterns in excludes.  It also adds efficient dependencies to rerun the primary
-	// builder whenever a file matching the pattern as added or removed, without rerunning if a
-	// file that does not match the pattern is added to a searched directory.
-	GlobWithDeps(pattern string, excludes []string) ([]string, error)
-
-	Fs() pathtools.FileSystem
-	AddNinjaFileDeps(deps ...string)
 }
 
 type ModuleContext interface {
-	androidBaseContext
 	BaseModuleContext
 
 	// Deprecated: use ModuleContext.Build instead.
@@ -117,8 +145,6 @@
 	ExpandSources(srcFiles, excludes []string) Paths
 	ExpandSource(srcFile, prop string) Path
 	ExpandOptionalSource(srcFile *string, prop string) OptionalPath
-	Glob(globPattern string, excludes []string) Paths
-	GlobFiles(globPattern string, excludes []string) Paths
 
 	InstallExecutable(installPath OutputPath, name string, srcPath Path, deps ...Path) OutputPath
 	InstallFile(installPath OutputPath, name string, srcPath Path, deps ...Path) OutputPath
@@ -126,8 +152,6 @@
 	InstallAbsoluteSymlink(installPath OutputPath, name string, absPath string) OutputPath
 	CheckbuildFile(srcPath Path)
 
-	AddMissingDependencies(deps []string)
-
 	InstallInData() bool
 	InstallInSanitizerDir() bool
 	InstallInRecovery() bool
@@ -136,30 +160,8 @@
 	HostRequiredModuleNames() []string
 	TargetRequiredModuleNames() []string
 
-	// android.ModuleContext methods
-	// These are duplicated instead of embedded so that can eventually be wrapped to take an
-	// android.Module instead of a blueprint.Module
-	OtherModuleName(m blueprint.Module) string
-	OtherModuleErrorf(m blueprint.Module, fmt string, args ...interface{})
-	OtherModuleDependencyTag(m blueprint.Module) blueprint.DependencyTag
-
-	GetDirectDepsWithTag(tag blueprint.DependencyTag) []Module
-	GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module
-	GetDirectDep(name string) (blueprint.Module, blueprint.DependencyTag)
-
 	ModuleSubDir() string
 
-	VisitDirectDepsBlueprint(visit func(blueprint.Module))
-	VisitDirectDeps(visit func(Module))
-	VisitDirectDepsWithTag(tag blueprint.DependencyTag, visit func(Module))
-	VisitDirectDepsIf(pred func(Module) bool, visit func(Module))
-	// Deprecated: use WalkDeps instead to support multiple dependency tags on the same module
-	VisitDepsDepthFirst(visit func(Module))
-	// Deprecated: use WalkDeps instead to support multiple dependency tags on the same module
-	VisitDepsDepthFirstIf(pred func(Module) bool, visit func(Module))
-	WalkDeps(visit func(Module, Module) bool)
-	WalkDepsBlueprint(visit func(blueprint.Module, blueprint.Module) bool)
-
 	Variable(pctx PackageContext, name, value string)
 	Rule(pctx PackageContext, name string, params blueprint.RuleParams, argNames ...string) blueprint.Rule
 	// Similar to blueprint.ModuleContext.Build, but takes Paths instead of []string,
@@ -200,6 +202,55 @@
 	BuildParamsForTests() []BuildParams
 	RuleParamsForTests() map[blueprint.Rule]blueprint.RuleParams
 	VariablesForTests() map[string]string
+
+	// Get the qualified module id for this module.
+	qualifiedModuleId(ctx BaseModuleContext) qualifiedModuleName
+
+	// Get information about the properties that can contain visibility rules.
+	visibilityProperties() []visibilityProperty
+}
+
+// Qualified id for a module
+type qualifiedModuleName struct {
+	// The package (i.e. directory) in which the module is defined, without trailing /
+	pkg string
+
+	// The name of the module, empty string if package.
+	name string
+}
+
+func (q qualifiedModuleName) String() string {
+	if q.name == "" {
+		return "//" + q.pkg
+	}
+	return "//" + q.pkg + ":" + q.name
+}
+
+func (q qualifiedModuleName) isRootPackage() bool {
+	return q.pkg == "" && q.name == ""
+}
+
+// Get the id for the package containing this module.
+func (q qualifiedModuleName) getContainingPackageId() qualifiedModuleName {
+	pkg := q.pkg
+	if q.name == "" {
+		if pkg == "" {
+			panic(fmt.Errorf("Cannot get containing package id of root package"))
+		}
+
+		index := strings.LastIndex(pkg, "/")
+		if index == -1 {
+			pkg = ""
+		} else {
+			pkg = pkg[:index]
+		}
+	}
+	return newPackageId(pkg)
+}
+
+func newPackageId(pkg string) qualifiedModuleName {
+	// A qualified id for a package module has no name.
+	return qualifiedModuleName{pkg: pkg, name: ""}
 }
 
 type nameProperties struct {
@@ -234,6 +285,20 @@
 	//      //packages/apps/Settings:__subpackages__.
 	//  ["//visibility:legacy_public"]: The default visibility, behaves as //visibility:public
 	//      for now. It is an error if it is used in a module.
+	//
+	// If a module does not specify the `visibility` property then it uses the
+	// `default_visibility` property of the `package` module in the module's package.
+	//
+	// If a module does not specify the `visibility` property then it uses the
+	// `default_visibility` property of the `package` module in the module's package.
+	//
+	// If the `default_visibility` property is not set for the module's package then
+	// it will use the `default_visibility` of its closest ancestor package for which
+	// a `default_visibility` property is specified.
+	//
+	// If no `default_visibility` property can be found then the module uses the
+	// global default of `//visibility:legacy_public`.
+	//
 	// See https://android.googlesource.com/platform/build/soong/+/master/README.md#visibility for
 	// more details.
 	Visibility []string
@@ -341,6 +406,8 @@
 	SkipInstall bool `blueprint:"mutated"`
 
 	NamespaceExportedToMake bool `blueprint:"mutated"`
+
+	MissingDeps []string `blueprint:"mutated"`
 }
 
 type hostAndDeviceProperties struct {
@@ -457,9 +524,9 @@
 // The ModuleBase type is responsible for implementing the GenerateBuildActions
 // method to support the blueprint.Module interface. This method will then call
 // the module's GenerateAndroidBuildActions method once for each build variant
-// that is to be built. GenerateAndroidBuildActions is passed a
-// AndroidModuleContext rather than the usual blueprint.ModuleContext.
-// AndroidModuleContext exposes extra functionality specific to the Android build
+// that is to be built. GenerateAndroidBuildActions is passed a ModuleContext
+// rather than the usual blueprint.ModuleContext.
+// ModuleContext exposes extra functionality specific to the Android build
 // system including details about the particular build variant that is to be
 // generated.
 //
@@ -526,83 +593,95 @@
 	prefer32 func(ctx BaseModuleContext, base *ModuleBase, class OsClass) bool
 }
 
-func (a *ModuleBase) DepsMutator(BottomUpMutatorContext) {}
+func (m *ModuleBase) DepsMutator(BottomUpMutatorContext) {}
 
-func (a *ModuleBase) AddProperties(props ...interface{}) {
-	a.registerProps = append(a.registerProps, props...)
+func (m *ModuleBase) AddProperties(props ...interface{}) {
+	m.registerProps = append(m.registerProps, props...)
 }
 
-func (a *ModuleBase) GetProperties() []interface{} {
-	return a.registerProps
+func (m *ModuleBase) GetProperties() []interface{} {
+	return m.registerProps
 }
 
-func (a *ModuleBase) BuildParamsForTests() []BuildParams {
-	return a.buildParams
+func (m *ModuleBase) BuildParamsForTests() []BuildParams {
+	return m.buildParams
 }
 
-func (a *ModuleBase) RuleParamsForTests() map[blueprint.Rule]blueprint.RuleParams {
-	return a.ruleParams
+func (m *ModuleBase) RuleParamsForTests() map[blueprint.Rule]blueprint.RuleParams {
+	return m.ruleParams
 }
 
-func (a *ModuleBase) VariablesForTests() map[string]string {
-	return a.variables
+func (m *ModuleBase) VariablesForTests() map[string]string {
+	return m.variables
 }
 
-func (a *ModuleBase) Prefer32(prefer32 func(ctx BaseModuleContext, base *ModuleBase, class OsClass) bool) {
-	a.prefer32 = prefer32
+func (m *ModuleBase) Prefer32(prefer32 func(ctx BaseModuleContext, base *ModuleBase, class OsClass) bool) {
+	m.prefer32 = prefer32
 }
 
 // Name returns the name of the module.  It may be overridden by individual module types, for
 // example prebuilts will prepend prebuilt_ to the name.
-func (a *ModuleBase) Name() string {
-	return String(a.nameProperties.Name)
+func (m *ModuleBase) Name() string {
+	return String(m.nameProperties.Name)
 }
 
 // BaseModuleName returns the name of the module as specified in the blueprints file.
-func (a *ModuleBase) BaseModuleName() string {
-	return String(a.nameProperties.Name)
+func (m *ModuleBase) BaseModuleName() string {
+	return String(m.nameProperties.Name)
 }
 
-func (a *ModuleBase) base() *ModuleBase {
-	return a
+func (m *ModuleBase) base() *ModuleBase {
+	return m
 }
 
-func (a *ModuleBase) SetTarget(target Target, multiTargets []Target, primary bool) {
-	a.commonProperties.CompileTarget = target
-	a.commonProperties.CompileMultiTargets = multiTargets
-	a.commonProperties.CompilePrimary = primary
+func (m *ModuleBase) qualifiedModuleId(ctx BaseModuleContext) qualifiedModuleName {
+	return qualifiedModuleName{pkg: ctx.ModuleDir(), name: ctx.ModuleName()}
 }
 
-func (a *ModuleBase) Target() Target {
-	return a.commonProperties.CompileTarget
+func (m *ModuleBase) visibilityProperties() []visibilityProperty {
+	return []visibilityProperty{
+		newVisibilityProperty("visibility", func() []string {
+			return m.base().commonProperties.Visibility
+		}),
+	}
 }
 
-func (a *ModuleBase) TargetPrimary() bool {
-	return a.commonProperties.CompilePrimary
+func (m *ModuleBase) SetTarget(target Target, multiTargets []Target, primary bool) {
+	m.commonProperties.CompileTarget = target
+	m.commonProperties.CompileMultiTargets = multiTargets
+	m.commonProperties.CompilePrimary = primary
 }
 
-func (a *ModuleBase) MultiTargets() []Target {
-	return a.commonProperties.CompileMultiTargets
+func (m *ModuleBase) Target() Target {
+	return m.commonProperties.CompileTarget
 }
 
-func (a *ModuleBase) Os() OsType {
-	return a.Target().Os
+func (m *ModuleBase) TargetPrimary() bool {
+	return m.commonProperties.CompilePrimary
 }
 
-func (a *ModuleBase) Host() bool {
-	return a.Os().Class == Host || a.Os().Class == HostCross
+func (m *ModuleBase) MultiTargets() []Target {
+	return m.commonProperties.CompileMultiTargets
 }
 
-func (a *ModuleBase) Arch() Arch {
-	return a.Target().Arch
+func (m *ModuleBase) Os() OsType {
+	return m.Target().Os
 }
 
-func (a *ModuleBase) ArchSpecific() bool {
-	return a.commonProperties.ArchSpecific
+func (m *ModuleBase) Host() bool {
+	return m.Os().Class == Host || m.Os().Class == HostCross
 }
 
-func (a *ModuleBase) OsClassSupported() []OsClass {
-	switch a.commonProperties.HostOrDeviceSupported {
+func (m *ModuleBase) Arch() Arch {
+	return m.Target().Arch
+}
+
+func (m *ModuleBase) ArchSpecific() bool {
+	return m.commonProperties.ArchSpecific
+}
+
+func (m *ModuleBase) OsClassSupported() []OsClass {
+	switch m.commonProperties.HostOrDeviceSupported {
 	case HostSupported:
 		return []OsClass{Host, HostCross}
 	case HostSupportedNoCross:
@@ -611,13 +690,13 @@
 		return []OsClass{Device}
 	case HostAndDeviceSupported, HostAndDeviceDefault:
 		var supported []OsClass
-		if Bool(a.hostAndDeviceProperties.Host_supported) ||
-			(a.commonProperties.HostOrDeviceSupported == HostAndDeviceDefault &&
-				a.hostAndDeviceProperties.Host_supported == nil) {
+		if Bool(m.hostAndDeviceProperties.Host_supported) ||
+			(m.commonProperties.HostOrDeviceSupported == HostAndDeviceDefault &&
+				m.hostAndDeviceProperties.Host_supported == nil) {
 			supported = append(supported, Host, HostCross)
 		}
-		if a.hostAndDeviceProperties.Device_supported == nil ||
-			*a.hostAndDeviceProperties.Device_supported {
+		if m.hostAndDeviceProperties.Device_supported == nil ||
+			*m.hostAndDeviceProperties.Device_supported {
 			supported = append(supported, Device)
 		}
 		return supported
@@ -626,49 +705,49 @@
 	}
 }
 
-func (a *ModuleBase) DeviceSupported() bool {
-	return a.commonProperties.HostOrDeviceSupported == DeviceSupported ||
-		a.commonProperties.HostOrDeviceSupported == HostAndDeviceSupported &&
-			(a.hostAndDeviceProperties.Device_supported == nil ||
-				*a.hostAndDeviceProperties.Device_supported)
+func (m *ModuleBase) DeviceSupported() bool {
+	return m.commonProperties.HostOrDeviceSupported == DeviceSupported ||
+		m.commonProperties.HostOrDeviceSupported == HostAndDeviceSupported &&
+			(m.hostAndDeviceProperties.Device_supported == nil ||
+				*m.hostAndDeviceProperties.Device_supported)
 }
 
-func (a *ModuleBase) Platform() bool {
-	return !a.DeviceSpecific() && !a.SocSpecific() && !a.ProductSpecific() && !a.ProductServicesSpecific()
+func (m *ModuleBase) Platform() bool {
+	return !m.DeviceSpecific() && !m.SocSpecific() && !m.ProductSpecific() && !m.ProductServicesSpecific()
 }
 
-func (a *ModuleBase) DeviceSpecific() bool {
-	return Bool(a.commonProperties.Device_specific)
+func (m *ModuleBase) DeviceSpecific() bool {
+	return Bool(m.commonProperties.Device_specific)
 }
 
-func (a *ModuleBase) SocSpecific() bool {
-	return Bool(a.commonProperties.Vendor) || Bool(a.commonProperties.Proprietary) || Bool(a.commonProperties.Soc_specific)
+func (m *ModuleBase) SocSpecific() bool {
+	return Bool(m.commonProperties.Vendor) || Bool(m.commonProperties.Proprietary) || Bool(m.commonProperties.Soc_specific)
 }
 
-func (a *ModuleBase) ProductSpecific() bool {
-	return Bool(a.commonProperties.Product_specific)
+func (m *ModuleBase) ProductSpecific() bool {
+	return Bool(m.commonProperties.Product_specific)
 }
 
-func (a *ModuleBase) ProductServicesSpecific() bool {
-	return Bool(a.commonProperties.Product_services_specific)
+func (m *ModuleBase) ProductServicesSpecific() bool {
+	return Bool(m.commonProperties.Product_services_specific)
 }
 
-func (a *ModuleBase) Enabled() bool {
-	if a.commonProperties.Enabled == nil {
-		return !a.Os().DefaultDisabled
+func (m *ModuleBase) Enabled() bool {
+	if m.commonProperties.Enabled == nil {
+		return !m.Os().DefaultDisabled
 	}
-	return *a.commonProperties.Enabled
+	return *m.commonProperties.Enabled
 }
 
-func (a *ModuleBase) SkipInstall() {
-	a.commonProperties.SkipInstall = true
+func (m *ModuleBase) SkipInstall() {
+	m.commonProperties.SkipInstall = true
 }
 
-func (a *ModuleBase) ExportedToMake() bool {
-	return a.commonProperties.NamespaceExportedToMake
+func (m *ModuleBase) ExportedToMake() bool {
+	return m.commonProperties.NamespaceExportedToMake
 }
 
-func (a *ModuleBase) computeInstallDeps(
+func (m *ModuleBase) computeInstallDeps(
 	ctx blueprint.ModuleContext) Paths {
 
 	result := Paths{}
@@ -683,35 +762,35 @@
 	return result
 }
 
-func (a *ModuleBase) filesToInstall() Paths {
-	return a.installFiles
+func (m *ModuleBase) filesToInstall() Paths {
+	return m.installFiles
 }
 
-func (p *ModuleBase) NoAddressSanitizer() bool {
-	return p.noAddressSanitizer
+func (m *ModuleBase) NoAddressSanitizer() bool {
+	return m.noAddressSanitizer
 }
 
-func (p *ModuleBase) InstallInData() bool {
+func (m *ModuleBase) InstallInData() bool {
 	return false
 }
 
-func (p *ModuleBase) InstallInSanitizerDir() bool {
+func (m *ModuleBase) InstallInSanitizerDir() bool {
 	return false
 }
 
-func (p *ModuleBase) InstallInRecovery() bool {
-	return Bool(p.commonProperties.Recovery)
+func (m *ModuleBase) InstallInRecovery() bool {
+	return Bool(m.commonProperties.Recovery)
 }
 
-func (a *ModuleBase) Owner() string {
-	return String(a.commonProperties.Owner)
+func (m *ModuleBase) Owner() string {
+	return String(m.commonProperties.Owner)
 }
 
-func (a *ModuleBase) NoticeFile() OptionalPath {
-	return a.noticeFile
+func (m *ModuleBase) NoticeFile() OptionalPath {
+	return m.noticeFile
 }
 
-func (a *ModuleBase) generateModuleTarget(ctx ModuleContext) {
+func (m *ModuleBase) generateModuleTarget(ctx ModuleContext) {
 	allInstalledFiles := Paths{}
 	allCheckbuildFiles := Paths{}
 	ctx.VisitAllModuleVariants(func(module Module) {
@@ -736,7 +815,7 @@
 			Default:   !ctx.Config().EmbeddedInMake(),
 		})
 		deps = append(deps, name)
-		a.installTarget = name
+		m.installTarget = name
 	}
 
 	if len(allCheckbuildFiles) > 0 {
@@ -747,7 +826,7 @@
 			Implicits: allCheckbuildFiles,
 		})
 		deps = append(deps, name)
-		a.checkbuildTarget = name
+		m.checkbuildTarget = name
 	}
 
 	if len(deps) > 0 {
@@ -763,26 +842,26 @@
 			Implicits: deps,
 		})
 
-		a.blueprintDir = ctx.ModuleDir()
+		m.blueprintDir = ctx.ModuleDir()
 	}
 }
 
-func determineModuleKind(a *ModuleBase, ctx blueprint.BaseModuleContext) moduleKind {
-	var socSpecific = Bool(a.commonProperties.Vendor) || Bool(a.commonProperties.Proprietary) || Bool(a.commonProperties.Soc_specific)
-	var deviceSpecific = Bool(a.commonProperties.Device_specific)
-	var productSpecific = Bool(a.commonProperties.Product_specific)
-	var productServicesSpecific = Bool(a.commonProperties.Product_services_specific)
+func determineModuleKind(m *ModuleBase, ctx blueprint.BaseModuleContext) moduleKind {
+	var socSpecific = Bool(m.commonProperties.Vendor) || Bool(m.commonProperties.Proprietary) || Bool(m.commonProperties.Soc_specific)
+	var deviceSpecific = Bool(m.commonProperties.Device_specific)
+	var productSpecific = Bool(m.commonProperties.Product_specific)
+	var productServicesSpecific = Bool(m.commonProperties.Product_services_specific)
 
 	msg := "conflicting value set here"
 	if socSpecific && deviceSpecific {
 		ctx.PropertyErrorf("device_specific", "a module cannot be specific to SoC and device at the same time.")
-		if Bool(a.commonProperties.Vendor) {
+		if Bool(m.commonProperties.Vendor) {
 			ctx.PropertyErrorf("vendor", msg)
 		}
-		if Bool(a.commonProperties.Proprietary) {
+		if Bool(m.commonProperties.Proprietary) {
 			ctx.PropertyErrorf("proprietary", msg)
 		}
-		if Bool(a.commonProperties.Soc_specific) {
+		if Bool(m.commonProperties.Soc_specific) {
 			ctx.PropertyErrorf("soc_specific", msg)
 		}
 	}
@@ -801,13 +880,13 @@
 		if deviceSpecific {
 			ctx.PropertyErrorf("device_specific", msg)
 		} else {
-			if Bool(a.commonProperties.Vendor) {
+			if Bool(m.commonProperties.Vendor) {
 				ctx.PropertyErrorf("vendor", msg)
 			}
-			if Bool(a.commonProperties.Proprietary) {
+			if Bool(m.commonProperties.Proprietary) {
 				ctx.PropertyErrorf("proprietary", msg)
 			}
-			if Bool(a.commonProperties.Soc_specific) {
+			if Bool(m.commonProperties.Soc_specific) {
 				ctx.PropertyErrorf("soc_specific", msg)
 			}
 		}
@@ -826,27 +905,36 @@
 	}
 }
 
-func (a *ModuleBase) androidBaseContextFactory(ctx blueprint.BaseModuleContext) androidBaseContextImpl {
-	return androidBaseContextImpl{
-		target:        a.commonProperties.CompileTarget,
-		targetPrimary: a.commonProperties.CompilePrimary,
-		multiTargets:  a.commonProperties.CompileMultiTargets,
-		kind:          determineModuleKind(a, ctx),
-		config:        ctx.Config().(Config),
+func (m *ModuleBase) baseModuleContextFactory(ctx blueprint.BaseModuleContext) baseModuleContext {
+	return baseModuleContext{
+		BaseModuleContext: ctx,
+		target:            m.commonProperties.CompileTarget,
+		targetPrimary:     m.commonProperties.CompilePrimary,
+		multiTargets:      m.commonProperties.CompileMultiTargets,
+		kind:              determineModuleKind(m, ctx),
+		config:            ctx.Config().(Config),
 	}
 }
 
-func (a *ModuleBase) GenerateBuildActions(blueprintCtx blueprint.ModuleContext) {
-	ctx := &androidModuleContext{
-		module:                 a.module,
-		ModuleContext:          blueprintCtx,
-		androidBaseContextImpl: a.androidBaseContextFactory(blueprintCtx),
-		installDeps:            a.computeInstallDeps(blueprintCtx),
-		installFiles:           a.installFiles,
-		missingDeps:            blueprintCtx.GetMissingDependencies(),
-		variables:              make(map[string]string),
+func (m *ModuleBase) GenerateBuildActions(blueprintCtx blueprint.ModuleContext) {
+	ctx := &moduleContext{
+		module:            m.module,
+		bp:                blueprintCtx,
+		baseModuleContext: m.baseModuleContextFactory(blueprintCtx),
+		installDeps:       m.computeInstallDeps(blueprintCtx),
+		installFiles:      m.installFiles,
+		variables:         make(map[string]string),
 	}
 
+	// Temporarily continue to call blueprintCtx.GetMissingDependencies() to maintain the previous behavior of never
+	// reporting missing dependency errors in Blueprint when AllowMissingDependencies == true.
+	// TODO: This will be removed once defaults modules handle missing dependency errors
+	blueprintCtx.GetMissingDependencies()
+
+	// For the final GenerateAndroidBuildActions pass, require that all visited dependencies Soong modules and
+	// are enabled.
+	ctx.baseModuleContext.strictVisitDeps = true
+
 	if ctx.config.captureBuild {
 		ctx.ruleParams = make(map[blueprint.Rule]blueprint.RuleParams)
 	}
@@ -869,70 +957,80 @@
 	ctx.Variable(pctx, "moduleDescSuffix", s)
 
 	// Some common property checks for properties that will be used later in androidmk.go
-	if a.commonProperties.Dist.Dest != nil {
-		_, err := validateSafePath(*a.commonProperties.Dist.Dest)
+	if m.commonProperties.Dist.Dest != nil {
+		_, err := validateSafePath(*m.commonProperties.Dist.Dest)
 		if err != nil {
 			ctx.PropertyErrorf("dist.dest", "%s", err.Error())
 		}
 	}
-	if a.commonProperties.Dist.Dir != nil {
-		_, err := validateSafePath(*a.commonProperties.Dist.Dir)
+	if m.commonProperties.Dist.Dir != nil {
+		_, err := validateSafePath(*m.commonProperties.Dist.Dir)
 		if err != nil {
 			ctx.PropertyErrorf("dist.dir", "%s", err.Error())
 		}
 	}
-	if a.commonProperties.Dist.Suffix != nil {
-		if strings.Contains(*a.commonProperties.Dist.Suffix, "/") {
+	if m.commonProperties.Dist.Suffix != nil {
+		if strings.Contains(*m.commonProperties.Dist.Suffix, "/") {
 			ctx.PropertyErrorf("dist.suffix", "Suffix may not contain a '/' character.")
 		}
 	}
 
-	if a.Enabled() {
-		a.module.GenerateAndroidBuildActions(ctx)
-		if ctx.Failed() {
-			return
-		}
-
-		a.installFiles = append(a.installFiles, ctx.installFiles...)
-		a.checkbuildFiles = append(a.checkbuildFiles, ctx.checkbuildFiles...)
-
-		notice := proptools.StringDefault(a.commonProperties.Notice, "NOTICE")
-		if m := SrcIsModule(notice); m != "" {
-			a.noticeFile = ctx.ExpandOptionalSource(&notice, "notice")
+	if m.Enabled() {
+		notice := proptools.StringDefault(m.commonProperties.Notice, "NOTICE")
+		if module := SrcIsModule(notice); module != "" {
+			m.noticeFile = ctx.ExpandOptionalSource(&notice, "notice")
 		} else {
 			noticePath := filepath.Join(ctx.ModuleDir(), notice)
-			a.noticeFile = ExistentPathForSource(ctx, noticePath)
+			m.noticeFile = ExistentPathForSource(ctx, noticePath)
 		}
+
+		m.module.GenerateAndroidBuildActions(ctx)
+		if ctx.Failed() {
+			return
+		}
+
+		m.installFiles = append(m.installFiles, ctx.installFiles...)
+		m.checkbuildFiles = append(m.checkbuildFiles, ctx.checkbuildFiles...)
+	} else if ctx.Config().AllowMissingDependencies() {
+		// If the module is not enabled it will not create any build rules, nothing will call
+		// ctx.GetMissingDependencies(), and blueprint will consider the missing dependencies to be unhandled
+		// and report them as an error even when AllowMissingDependencies = true.  Call
+		// ctx.GetMissingDependencies() here to tell blueprint not to handle them.
+		ctx.GetMissingDependencies()
 	}
 
-	if a == ctx.FinalModule().(Module).base() {
-		a.generateModuleTarget(ctx)
+	if m == ctx.FinalModule().(Module).base() {
+		m.generateModuleTarget(ctx)
 		if ctx.Failed() {
 			return
 		}
 	}
 
-	a.buildParams = ctx.buildParams
-	a.ruleParams = ctx.ruleParams
-	a.variables = ctx.variables
+	m.buildParams = ctx.buildParams
+	m.ruleParams = ctx.ruleParams
+	m.variables = ctx.variables
 }
 
-type androidBaseContextImpl struct {
+type baseModuleContext struct {
+	blueprint.BaseModuleContext
 	target        Target
 	multiTargets  []Target
 	targetPrimary bool
 	debug         bool
 	kind          moduleKind
 	config        Config
+
+	walkPath []Module
+
+	strictVisitDeps bool // If true, enforce that all dependencies are enabled
 }
 
-type androidModuleContext struct {
-	blueprint.ModuleContext
-	androidBaseContextImpl
+type moduleContext struct {
+	bp blueprint.ModuleContext
+	baseModuleContext
 	installDeps     Paths
 	installFiles    Paths
 	checkbuildFiles Paths
-	missingDeps     []string
 	module          Module
 
 	// For tests
@@ -941,25 +1039,22 @@
 	variables   map[string]string
 }
 
-func (a *androidModuleContext) ninjaError(desc string, outputs []string, err error) {
-	a.ModuleContext.Build(pctx.PackageContext, blueprint.BuildParams{
-		Rule:        ErrorRule,
-		Description: desc,
-		Outputs:     outputs,
-		Optional:    true,
+func (m *moduleContext) ninjaError(params BuildParams, err error) (PackageContext, BuildParams) {
+	return pctx, BuildParams{
+		Rule:            ErrorRule,
+		Description:     params.Description,
+		Output:          params.Output,
+		Outputs:         params.Outputs,
+		ImplicitOutput:  params.ImplicitOutput,
+		ImplicitOutputs: params.ImplicitOutputs,
 		Args: map[string]string{
 			"error": err.Error(),
 		},
-	})
-	return
+	}
 }
 
-func (a *androidModuleContext) Config() Config {
-	return a.ModuleContext.Config().(Config)
-}
-
-func (a *androidModuleContext) ModuleBuild(pctx PackageContext, params ModuleBuildParams) {
-	a.Build(pctx, BuildParams(params))
+func (m *moduleContext) ModuleBuild(pctx PackageContext, params ModuleBuildParams) {
+	m.Build(pctx, BuildParams(params))
 }
 
 func convertBuildParams(params BuildParams) blueprint.BuildParams {
@@ -1002,86 +1097,100 @@
 	return bparams
 }
 
-func (a *androidModuleContext) Variable(pctx PackageContext, name, value string) {
-	if a.config.captureBuild {
-		a.variables[name] = value
+func (m *moduleContext) Variable(pctx PackageContext, name, value string) {
+	if m.config.captureBuild {
+		m.variables[name] = value
 	}
 
-	a.ModuleContext.Variable(pctx.PackageContext, name, value)
+	m.bp.Variable(pctx.PackageContext, name, value)
 }
 
-func (a *androidModuleContext) Rule(pctx PackageContext, name string, params blueprint.RuleParams,
+func (m *moduleContext) Rule(pctx PackageContext, name string, params blueprint.RuleParams,
 	argNames ...string) blueprint.Rule {
 
-	rule := a.ModuleContext.Rule(pctx.PackageContext, name, params, argNames...)
+	rule := m.bp.Rule(pctx.PackageContext, name, params, argNames...)
 
-	if a.config.captureBuild {
-		a.ruleParams[rule] = params
+	if m.config.captureBuild {
+		m.ruleParams[rule] = params
 	}
 
 	return rule
 }
 
-func (a *androidModuleContext) Build(pctx PackageContext, params BuildParams) {
-	if a.config.captureBuild {
-		a.buildParams = append(a.buildParams, params)
+func (m *moduleContext) Build(pctx PackageContext, params BuildParams) {
+	if params.Description != "" {
+		params.Description = "${moduleDesc}" + params.Description + "${moduleDescSuffix}"
 	}
 
-	bparams := convertBuildParams(params)
-
-	if bparams.Description != "" {
-		bparams.Description = "${moduleDesc}" + params.Description + "${moduleDescSuffix}"
+	if missingDeps := m.GetMissingDependencies(); len(missingDeps) > 0 {
+		pctx, params = m.ninjaError(params, fmt.Errorf("module %s missing dependencies: %s\n",
+			m.ModuleName(), strings.Join(missingDeps, ", ")))
 	}
 
-	if a.missingDeps != nil {
-		a.ninjaError(bparams.Description, bparams.Outputs,
-			fmt.Errorf("module %s missing dependencies: %s\n",
-				a.ModuleName(), strings.Join(a.missingDeps, ", ")))
-		return
+	if m.config.captureBuild {
+		m.buildParams = append(m.buildParams, params)
 	}
 
-	a.ModuleContext.Build(pctx.PackageContext, bparams)
+	m.bp.Build(pctx.PackageContext, convertBuildParams(params))
 }
 
-func (a *androidModuleContext) GetMissingDependencies() []string {
-	return a.missingDeps
+func (b *baseModuleContext) Module() Module {
+	module, _ := b.BaseModuleContext.Module().(Module)
+	return module
 }
 
-func (a *androidModuleContext) AddMissingDependencies(deps []string) {
+func (b *baseModuleContext) Config() Config {
+	return b.BaseModuleContext.Config().(Config)
+}
+
+func (m *moduleContext) GetMissingDependencies() []string {
+	var missingDeps []string
+	missingDeps = append(missingDeps, m.Module().base().commonProperties.MissingDeps...)
+	missingDeps = append(missingDeps, m.bp.GetMissingDependencies()...)
+	missingDeps = FirstUniqueStrings(missingDeps)
+	return missingDeps
+}
+
+func (b *baseModuleContext) AddMissingDependencies(deps []string) {
 	if deps != nil {
-		a.missingDeps = append(a.missingDeps, deps...)
-		a.missingDeps = FirstUniqueStrings(a.missingDeps)
+		missingDeps := &b.Module().base().commonProperties.MissingDeps
+		*missingDeps = append(*missingDeps, deps...)
+		*missingDeps = FirstUniqueStrings(*missingDeps)
 	}
 }
 
-func (a *androidModuleContext) validateAndroidModule(module blueprint.Module) Module {
+func (b *baseModuleContext) validateAndroidModule(module blueprint.Module, strict bool) Module {
 	aModule, _ := module.(Module)
+
+	if !strict {
+		return aModule
+	}
+
 	if aModule == nil {
-		a.ModuleErrorf("module %q not an android module", a.OtherModuleName(aModule))
+		b.ModuleErrorf("module %q not an android module", b.OtherModuleName(module))
 		return nil
 	}
 
 	if !aModule.Enabled() {
-		if a.Config().AllowMissingDependencies() {
-			a.AddMissingDependencies([]string{a.OtherModuleName(aModule)})
+		if b.Config().AllowMissingDependencies() {
+			b.AddMissingDependencies([]string{b.OtherModuleName(aModule)})
 		} else {
-			a.ModuleErrorf("depends on disabled module %q", a.OtherModuleName(aModule))
+			b.ModuleErrorf("depends on disabled module %q", b.OtherModuleName(aModule))
 		}
 		return nil
 	}
-
 	return aModule
 }
 
-func (a *androidModuleContext) getDirectDepInternal(name string, tag blueprint.DependencyTag) (blueprint.Module, blueprint.DependencyTag) {
+func (b *baseModuleContext) getDirectDepInternal(name string, tag blueprint.DependencyTag) (blueprint.Module, blueprint.DependencyTag) {
 	type dep struct {
 		mod blueprint.Module
 		tag blueprint.DependencyTag
 	}
 	var deps []dep
-	a.VisitDirectDepsBlueprint(func(m blueprint.Module) {
-		if aModule, _ := m.(Module); aModule != nil && aModule.base().BaseModuleName() == name {
-			returnedTag := a.ModuleContext.OtherModuleDependencyTag(aModule)
+	b.VisitDirectDepsBlueprint(func(module blueprint.Module) {
+		if aModule, _ := module.(Module); aModule != nil && aModule.base().BaseModuleName() == name {
+			returnedTag := b.BaseModuleContext.OtherModuleDependencyTag(aModule)
 			if tag == nil || returnedTag == tag {
 				deps = append(deps, dep{aModule, returnedTag})
 			}
@@ -1091,17 +1200,17 @@
 		return deps[0].mod, deps[0].tag
 	} else if len(deps) >= 2 {
 		panic(fmt.Errorf("Multiple dependencies having same BaseModuleName() %q found from %q",
-			name, a.ModuleName()))
+			name, b.ModuleName()))
 	} else {
 		return nil, nil
 	}
 }
 
-func (a *androidModuleContext) GetDirectDepsWithTag(tag blueprint.DependencyTag) []Module {
+func (b *baseModuleContext) GetDirectDepsWithTag(tag blueprint.DependencyTag) []Module {
 	var deps []Module
-	a.VisitDirectDepsBlueprint(func(m blueprint.Module) {
-		if aModule, _ := m.(Module); aModule != nil {
-			if a.ModuleContext.OtherModuleDependencyTag(aModule) == tag {
+	b.VisitDirectDepsBlueprint(func(module blueprint.Module) {
+		if aModule, _ := module.(Module); aModule != nil {
+			if b.BaseModuleContext.OtherModuleDependencyTag(aModule) == tag {
 				deps = append(deps, aModule)
 			}
 		}
@@ -1109,42 +1218,42 @@
 	return deps
 }
 
-func (a *androidModuleContext) GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module {
-	m, _ := a.getDirectDepInternal(name, tag)
-	return m
+func (m *moduleContext) GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module {
+	module, _ := m.getDirectDepInternal(name, tag)
+	return module
 }
 
-func (a *androidModuleContext) GetDirectDep(name string) (blueprint.Module, blueprint.DependencyTag) {
-	return a.getDirectDepInternal(name, nil)
+func (b *baseModuleContext) GetDirectDep(name string) (blueprint.Module, blueprint.DependencyTag) {
+	return b.getDirectDepInternal(name, nil)
 }
 
-func (a *androidModuleContext) VisitDirectDepsBlueprint(visit func(blueprint.Module)) {
-	a.ModuleContext.VisitDirectDeps(visit)
+func (b *baseModuleContext) VisitDirectDepsBlueprint(visit func(blueprint.Module)) {
+	b.BaseModuleContext.VisitDirectDeps(visit)
 }
 
-func (a *androidModuleContext) VisitDirectDeps(visit func(Module)) {
-	a.ModuleContext.VisitDirectDeps(func(module blueprint.Module) {
-		if aModule := a.validateAndroidModule(module); aModule != nil {
+func (b *baseModuleContext) VisitDirectDeps(visit func(Module)) {
+	b.BaseModuleContext.VisitDirectDeps(func(module blueprint.Module) {
+		if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
 			visit(aModule)
 		}
 	})
 }
 
-func (a *androidModuleContext) VisitDirectDepsWithTag(tag blueprint.DependencyTag, visit func(Module)) {
-	a.ModuleContext.VisitDirectDeps(func(module blueprint.Module) {
-		if aModule := a.validateAndroidModule(module); aModule != nil {
-			if a.ModuleContext.OtherModuleDependencyTag(aModule) == tag {
+func (b *baseModuleContext) VisitDirectDepsWithTag(tag blueprint.DependencyTag, visit func(Module)) {
+	b.BaseModuleContext.VisitDirectDeps(func(module blueprint.Module) {
+		if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
+			if b.BaseModuleContext.OtherModuleDependencyTag(aModule) == tag {
 				visit(aModule)
 			}
 		}
 	})
 }
 
-func (a *androidModuleContext) VisitDirectDepsIf(pred func(Module) bool, visit func(Module)) {
-	a.ModuleContext.VisitDirectDepsIf(
+func (b *baseModuleContext) VisitDirectDepsIf(pred func(Module) bool, visit func(Module)) {
+	b.BaseModuleContext.VisitDirectDepsIf(
 		// pred
 		func(module blueprint.Module) bool {
-			if aModule := a.validateAndroidModule(module); aModule != nil {
+			if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
 				return pred(aModule)
 			} else {
 				return false
@@ -1156,19 +1265,19 @@
 		})
 }
 
-func (a *androidModuleContext) VisitDepsDepthFirst(visit func(Module)) {
-	a.ModuleContext.VisitDepsDepthFirst(func(module blueprint.Module) {
-		if aModule := a.validateAndroidModule(module); aModule != nil {
+func (b *baseModuleContext) VisitDepsDepthFirst(visit func(Module)) {
+	b.BaseModuleContext.VisitDepsDepthFirst(func(module blueprint.Module) {
+		if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
 			visit(aModule)
 		}
 	})
 }
 
-func (a *androidModuleContext) VisitDepsDepthFirstIf(pred func(Module) bool, visit func(Module)) {
-	a.ModuleContext.VisitDepsDepthFirstIf(
+func (b *baseModuleContext) VisitDepsDepthFirstIf(pred func(Module) bool, visit func(Module)) {
+	b.BaseModuleContext.VisitDepsDepthFirstIf(
 		// pred
 		func(module blueprint.Module) bool {
-			if aModule := a.validateAndroidModule(module); aModule != nil {
+			if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
 				return pred(aModule)
 			} else {
 				return false
@@ -1180,15 +1289,21 @@
 		})
 }
 
-func (a *androidModuleContext) WalkDepsBlueprint(visit func(blueprint.Module, blueprint.Module) bool) {
-	a.ModuleContext.WalkDeps(visit)
+func (b *baseModuleContext) WalkDepsBlueprint(visit func(blueprint.Module, blueprint.Module) bool) {
+	b.BaseModuleContext.WalkDeps(visit)
 }
 
-func (a *androidModuleContext) WalkDeps(visit func(Module, Module) bool) {
-	a.ModuleContext.WalkDeps(func(child, parent blueprint.Module) bool {
-		childAndroidModule := a.validateAndroidModule(child)
-		parentAndroidModule := a.validateAndroidModule(parent)
+func (b *baseModuleContext) WalkDeps(visit func(Module, Module) bool) {
+	b.walkPath = []Module{b.Module()}
+	b.BaseModuleContext.WalkDeps(func(child, parent blueprint.Module) bool {
+		childAndroidModule, _ := child.(Module)
+		parentAndroidModule, _ := parent.(Module)
 		if childAndroidModule != nil && parentAndroidModule != nil {
+			// record walkPath before visit
+			for b.walkPath[len(b.walkPath)-1] != parentAndroidModule {
+				b.walkPath = b.walkPath[0 : len(b.walkPath)-1]
+			}
+			b.walkPath = append(b.walkPath, childAndroidModule)
 			return visit(childAndroidModule, parentAndroidModule)
 		} else {
 			return false
@@ -1196,143 +1311,151 @@
 	})
 }
 
-func (a *androidModuleContext) VisitAllModuleVariants(visit func(Module)) {
-	a.ModuleContext.VisitAllModuleVariants(func(module blueprint.Module) {
+func (b *baseModuleContext) GetWalkPath() []Module {
+	return b.walkPath
+}
+
+func (m *moduleContext) VisitAllModuleVariants(visit func(Module)) {
+	m.bp.VisitAllModuleVariants(func(module blueprint.Module) {
 		visit(module.(Module))
 	})
 }
 
-func (a *androidModuleContext) PrimaryModule() Module {
-	return a.ModuleContext.PrimaryModule().(Module)
+func (m *moduleContext) PrimaryModule() Module {
+	return m.bp.PrimaryModule().(Module)
 }
 
-func (a *androidModuleContext) FinalModule() Module {
-	return a.ModuleContext.FinalModule().(Module)
+func (m *moduleContext) FinalModule() Module {
+	return m.bp.FinalModule().(Module)
 }
 
-func (a *androidBaseContextImpl) Target() Target {
-	return a.target
+func (m *moduleContext) ModuleSubDir() string {
+	return m.bp.ModuleSubDir()
 }
 
-func (a *androidBaseContextImpl) TargetPrimary() bool {
-	return a.targetPrimary
+func (b *baseModuleContext) Target() Target {
+	return b.target
 }
 
-func (a *androidBaseContextImpl) MultiTargets() []Target {
-	return a.multiTargets
+func (b *baseModuleContext) TargetPrimary() bool {
+	return b.targetPrimary
 }
 
-func (a *androidBaseContextImpl) Arch() Arch {
-	return a.target.Arch
+func (b *baseModuleContext) MultiTargets() []Target {
+	return b.multiTargets
 }
 
-func (a *androidBaseContextImpl) Os() OsType {
-	return a.target.Os
+func (b *baseModuleContext) Arch() Arch {
+	return b.target.Arch
 }
 
-func (a *androidBaseContextImpl) Host() bool {
-	return a.target.Os.Class == Host || a.target.Os.Class == HostCross
+func (b *baseModuleContext) Os() OsType {
+	return b.target.Os
 }
 
-func (a *androidBaseContextImpl) Device() bool {
-	return a.target.Os.Class == Device
+func (b *baseModuleContext) Host() bool {
+	return b.target.Os.Class == Host || b.target.Os.Class == HostCross
 }
 
-func (a *androidBaseContextImpl) Darwin() bool {
-	return a.target.Os == Darwin
+func (b *baseModuleContext) Device() bool {
+	return b.target.Os.Class == Device
 }
 
-func (a *androidBaseContextImpl) Fuchsia() bool {
-	return a.target.Os == Fuchsia
+func (b *baseModuleContext) Darwin() bool {
+	return b.target.Os == Darwin
 }
 
-func (a *androidBaseContextImpl) Windows() bool {
-	return a.target.Os == Windows
+func (b *baseModuleContext) Fuchsia() bool {
+	return b.target.Os == Fuchsia
 }
 
-func (a *androidBaseContextImpl) Debug() bool {
-	return a.debug
+func (b *baseModuleContext) Windows() bool {
+	return b.target.Os == Windows
 }
 
-func (a *androidBaseContextImpl) PrimaryArch() bool {
-	if len(a.config.Targets[a.target.Os]) <= 1 {
+func (b *baseModuleContext) Debug() bool {
+	return b.debug
+}
+
+func (b *baseModuleContext) PrimaryArch() bool {
+	if len(b.config.Targets[b.target.Os]) <= 1 {
 		return true
 	}
-	return a.target.Arch.ArchType == a.config.Targets[a.target.Os][0].Arch.ArchType
+	return b.target.Arch.ArchType == b.config.Targets[b.target.Os][0].Arch.ArchType
 }
 
-func (a *androidBaseContextImpl) AConfig() Config {
-	return a.config
+func (b *baseModuleContext) AConfig() Config {
+	return b.config
 }
 
-func (a *androidBaseContextImpl) DeviceConfig() DeviceConfig {
-	return DeviceConfig{a.config.deviceConfig}
+func (b *baseModuleContext) DeviceConfig() DeviceConfig {
+	return DeviceConfig{b.config.deviceConfig}
 }
 
-func (a *androidBaseContextImpl) Platform() bool {
-	return a.kind == platformModule
+func (b *baseModuleContext) Platform() bool {
+	return b.kind == platformModule
 }
 
-func (a *androidBaseContextImpl) DeviceSpecific() bool {
-	return a.kind == deviceSpecificModule
+func (b *baseModuleContext) DeviceSpecific() bool {
+	return b.kind == deviceSpecificModule
 }
 
-func (a *androidBaseContextImpl) SocSpecific() bool {
-	return a.kind == socSpecificModule
+func (b *baseModuleContext) SocSpecific() bool {
+	return b.kind == socSpecificModule
 }
 
-func (a *androidBaseContextImpl) ProductSpecific() bool {
-	return a.kind == productSpecificModule
+func (b *baseModuleContext) ProductSpecific() bool {
+	return b.kind == productSpecificModule
 }
 
-func (a *androidBaseContextImpl) ProductServicesSpecific() bool {
-	return a.kind == productServicesSpecificModule
+func (b *baseModuleContext) ProductServicesSpecific() bool {
+	return b.kind == productServicesSpecificModule
 }
 
 // Makes this module a platform module, i.e. not specific to soc, device,
 // product, or product_services.
-func (a *ModuleBase) MakeAsPlatform() {
-	a.commonProperties.Vendor = boolPtr(false)
-	a.commonProperties.Proprietary = boolPtr(false)
-	a.commonProperties.Soc_specific = boolPtr(false)
-	a.commonProperties.Product_specific = boolPtr(false)
-	a.commonProperties.Product_services_specific = boolPtr(false)
+func (m *ModuleBase) MakeAsPlatform() {
+	m.commonProperties.Vendor = boolPtr(false)
+	m.commonProperties.Proprietary = boolPtr(false)
+	m.commonProperties.Soc_specific = boolPtr(false)
+	m.commonProperties.Product_specific = boolPtr(false)
+	m.commonProperties.Product_services_specific = boolPtr(false)
 }
 
-func (a *ModuleBase) EnableNativeBridgeSupportByDefault() {
-	a.commonProperties.Native_bridge_supported = boolPtr(true)
+func (m *ModuleBase) EnableNativeBridgeSupportByDefault() {
+	m.commonProperties.Native_bridge_supported = boolPtr(true)
 }
 
-func (a *androidModuleContext) InstallInData() bool {
-	return a.module.InstallInData()
+func (m *moduleContext) InstallInData() bool {
+	return m.module.InstallInData()
 }
 
-func (a *androidModuleContext) InstallInSanitizerDir() bool {
-	return a.module.InstallInSanitizerDir()
+func (m *moduleContext) InstallInSanitizerDir() bool {
+	return m.module.InstallInSanitizerDir()
 }
 
-func (a *androidModuleContext) InstallInRecovery() bool {
-	return a.module.InstallInRecovery()
+func (m *moduleContext) InstallInRecovery() bool {
+	return m.module.InstallInRecovery()
 }
 
-func (a *androidModuleContext) skipInstall(fullInstallPath OutputPath) bool {
-	if a.module.base().commonProperties.SkipInstall {
+func (m *moduleContext) skipInstall(fullInstallPath OutputPath) bool {
+	if m.module.base().commonProperties.SkipInstall {
 		return true
 	}
 
 	// We'll need a solution for choosing which of modules with the same name in different
 	// namespaces to install.  For now, reuse the list of namespaces exported to Make as the
 	// list of namespaces to install in a Soong-only build.
-	if !a.module.base().commonProperties.NamespaceExportedToMake {
+	if !m.module.base().commonProperties.NamespaceExportedToMake {
 		return true
 	}
 
-	if a.Device() {
-		if a.Config().SkipDeviceInstall() {
+	if m.Device() {
+		if m.Config().SkipDeviceInstall() {
 			return true
 		}
 
-		if a.Config().SkipMegaDeviceInstall(fullInstallPath.String()) {
+		if m.Config().SkipMegaDeviceInstall(fullInstallPath.String()) {
 			return true
 		}
 	}
@@ -1340,29 +1463,29 @@
 	return false
 }
 
-func (a *androidModuleContext) InstallFile(installPath OutputPath, name string, srcPath Path,
+func (m *moduleContext) InstallFile(installPath OutputPath, name string, srcPath Path,
 	deps ...Path) OutputPath {
-	return a.installFile(installPath, name, srcPath, Cp, deps)
+	return m.installFile(installPath, name, srcPath, Cp, deps)
 }
 
-func (a *androidModuleContext) InstallExecutable(installPath OutputPath, name string, srcPath Path,
+func (m *moduleContext) InstallExecutable(installPath OutputPath, name string, srcPath Path,
 	deps ...Path) OutputPath {
-	return a.installFile(installPath, name, srcPath, CpExecutable, deps)
+	return m.installFile(installPath, name, srcPath, CpExecutable, deps)
 }
 
-func (a *androidModuleContext) installFile(installPath OutputPath, name string, srcPath Path,
+func (m *moduleContext) installFile(installPath OutputPath, name string, srcPath Path,
 	rule blueprint.Rule, deps []Path) OutputPath {
 
-	fullInstallPath := installPath.Join(a, name)
-	a.module.base().hooks.runInstallHooks(a, fullInstallPath, false)
+	fullInstallPath := installPath.Join(m, name)
+	m.module.base().hooks.runInstallHooks(m, fullInstallPath, false)
 
-	if !a.skipInstall(fullInstallPath) {
+	if !m.skipInstall(fullInstallPath) {
 
-		deps = append(deps, a.installDeps...)
+		deps = append(deps, m.installDeps...)
 
 		var implicitDeps, orderOnlyDeps Paths
 
-		if a.Host() {
+		if m.Host() {
 			// Installed host modules might be used during the build, depend directly on their
 			// dependencies so their timestamp is updated whenever their dependency is updated
 			implicitDeps = deps
@@ -1370,73 +1493,73 @@
 			orderOnlyDeps = deps
 		}
 
-		a.Build(pctx, BuildParams{
+		m.Build(pctx, BuildParams{
 			Rule:        rule,
 			Description: "install " + fullInstallPath.Base(),
 			Output:      fullInstallPath,
 			Input:       srcPath,
 			Implicits:   implicitDeps,
 			OrderOnly:   orderOnlyDeps,
-			Default:     !a.Config().EmbeddedInMake(),
+			Default:     !m.Config().EmbeddedInMake(),
 		})
 
-		a.installFiles = append(a.installFiles, fullInstallPath)
+		m.installFiles = append(m.installFiles, fullInstallPath)
 	}
-	a.checkbuildFiles = append(a.checkbuildFiles, srcPath)
+	m.checkbuildFiles = append(m.checkbuildFiles, srcPath)
 	return fullInstallPath
 }
 
-func (a *androidModuleContext) InstallSymlink(installPath OutputPath, name string, srcPath OutputPath) OutputPath {
-	fullInstallPath := installPath.Join(a, name)
-	a.module.base().hooks.runInstallHooks(a, fullInstallPath, true)
+func (m *moduleContext) InstallSymlink(installPath OutputPath, name string, srcPath OutputPath) OutputPath {
+	fullInstallPath := installPath.Join(m, name)
+	m.module.base().hooks.runInstallHooks(m, fullInstallPath, true)
 
-	if !a.skipInstall(fullInstallPath) {
+	if !m.skipInstall(fullInstallPath) {
 
 		relPath, err := filepath.Rel(path.Dir(fullInstallPath.String()), srcPath.String())
 		if err != nil {
 			panic(fmt.Sprintf("Unable to generate symlink between %q and %q: %s", fullInstallPath.Base(), srcPath.Base(), err))
 		}
-		a.Build(pctx, BuildParams{
+		m.Build(pctx, BuildParams{
 			Rule:        Symlink,
 			Description: "install symlink " + fullInstallPath.Base(),
 			Output:      fullInstallPath,
 			OrderOnly:   Paths{srcPath},
-			Default:     !a.Config().EmbeddedInMake(),
+			Default:     !m.Config().EmbeddedInMake(),
 			Args: map[string]string{
 				"fromPath": relPath,
 			},
 		})
 
-		a.installFiles = append(a.installFiles, fullInstallPath)
-		a.checkbuildFiles = append(a.checkbuildFiles, srcPath)
+		m.installFiles = append(m.installFiles, fullInstallPath)
+		m.checkbuildFiles = append(m.checkbuildFiles, srcPath)
 	}
 	return fullInstallPath
 }
 
 // installPath/name -> absPath where absPath might be a path that is available only at runtime
 // (e.g. /apex/...)
-func (a *androidModuleContext) InstallAbsoluteSymlink(installPath OutputPath, name string, absPath string) OutputPath {
-	fullInstallPath := installPath.Join(a, name)
-	a.module.base().hooks.runInstallHooks(a, fullInstallPath, true)
+func (m *moduleContext) InstallAbsoluteSymlink(installPath OutputPath, name string, absPath string) OutputPath {
+	fullInstallPath := installPath.Join(m, name)
+	m.module.base().hooks.runInstallHooks(m, fullInstallPath, true)
 
-	if !a.skipInstall(fullInstallPath) {
-		a.Build(pctx, BuildParams{
+	if !m.skipInstall(fullInstallPath) {
+		m.Build(pctx, BuildParams{
 			Rule:        Symlink,
 			Description: "install symlink " + fullInstallPath.Base() + " -> " + absPath,
 			Output:      fullInstallPath,
-			Default:     !a.Config().EmbeddedInMake(),
+			Default:     !m.Config().EmbeddedInMake(),
 			Args: map[string]string{
 				"fromPath": absPath,
 			},
 		})
 
-		a.installFiles = append(a.installFiles, fullInstallPath)
+		m.installFiles = append(m.installFiles, fullInstallPath)
 	}
 	return fullInstallPath
 }
 
-func (a *androidModuleContext) CheckbuildFile(srcPath Path) {
-	a.checkbuildFiles = append(a.checkbuildFiles, srcPath)
+func (m *moduleContext) CheckbuildFile(srcPath Path) {
+	m.checkbuildFiles = append(m.checkbuildFiles, srcPath)
 }
 
 type fileInstaller interface {
@@ -1462,39 +1585,60 @@
 	return -1
 }
 
-func SrcIsModule(s string) string {
+// SrcIsModule decodes module references in the format ":name" into the module name, or empty string if the input
+// was not a module reference.
+func SrcIsModule(s string) (module string) {
 	if len(s) > 1 && s[0] == ':' {
 		return s[1:]
 	}
 	return ""
 }
 
-type sourceDependencyTag struct {
-	blueprint.BaseDependencyTag
+// SrcIsModule decodes module references in the format ":name{.tag}" into the module name and tag, ":name" into the
+// module name and an empty string for the tag, or empty strings if the input was not a module reference.
+func SrcIsModuleWithTag(s string) (module, tag string) {
+	if len(s) > 1 && s[0] == ':' {
+		module = s[1:]
+		if tagStart := strings.IndexByte(module, '{'); tagStart > 0 {
+			if module[len(module)-1] == '}' {
+				tag = module[tagStart+1 : len(module)-1]
+				module = module[:tagStart]
+				return module, tag
+			}
+		}
+		return module, ""
+	}
+	return "", ""
 }
 
-var SourceDepTag sourceDependencyTag
+type sourceOrOutputDependencyTag struct {
+	blueprint.BaseDependencyTag
+	tag string
+}
+
+func sourceOrOutputDepTag(tag string) blueprint.DependencyTag {
+	return sourceOrOutputDependencyTag{tag: tag}
+}
+
+var SourceDepTag = sourceOrOutputDepTag("")
 
 // Adds necessary dependencies to satisfy filegroup or generated sources modules listed in srcFiles
 // using ":module" syntax, if any.
 //
 // Deprecated: tag the property with `android:"path"` instead.
 func ExtractSourcesDeps(ctx BottomUpMutatorContext, srcFiles []string) {
-	var deps []string
 	set := make(map[string]bool)
 
 	for _, s := range srcFiles {
-		if m := SrcIsModule(s); m != "" {
-			if _, found := set[m]; found {
-				ctx.ModuleErrorf("found source dependency duplicate: %q!", m)
+		if m, t := SrcIsModuleWithTag(s); m != "" {
+			if _, found := set[s]; found {
+				ctx.ModuleErrorf("found source dependency duplicate: %q!", s)
 			} else {
-				set[m] = true
-				deps = append(deps, m)
+				set[s] = true
+				ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
 			}
 		}
 	}
-
-	ctx.AddDependency(ctx.Module(), SourceDepTag, deps...)
 }
 
 // Adds necessary dependencies to satisfy filegroup or generated sources modules specified in s
@@ -1503,16 +1647,25 @@
 // Deprecated: tag the property with `android:"path"` instead.
 func ExtractSourceDeps(ctx BottomUpMutatorContext, s *string) {
 	if s != nil {
-		if m := SrcIsModule(*s); m != "" {
-			ctx.AddDependency(ctx.Module(), SourceDepTag, m)
+		if m, t := SrcIsModuleWithTag(*s); m != "" {
+			ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
 		}
 	}
 }
 
+// A module that implements SourceFileProducer can be referenced from any property that is tagged with `android:"path"`
+// using the ":module" syntax and provides a list of paths to be used as if they were listed in the property.
 type SourceFileProducer interface {
 	Srcs() Paths
 }
 
+// A module that implements OutputFileProducer can be referenced from any property that is tagged with `android:"path"`
+// using the ":module" syntax or ":module{.tag}" syntax and provides a list of otuput files to be used as if they were
+// listed in the property.
+type OutputFileProducer interface {
+	OutputFiles(tag string) (Paths, error)
+}
+
 type HostToolProvider interface {
 	HostToolPath() OptionalPath
 }
@@ -1521,54 +1674,54 @@
 // be tagged with `android:"path" to support automatic source module dependency resolution.
 //
 // Deprecated: use PathsForModuleSrc or PathsForModuleSrcExcludes instead.
-func (ctx *androidModuleContext) ExpandSources(srcFiles, excludes []string) Paths {
-	return PathsForModuleSrcExcludes(ctx, srcFiles, excludes)
+func (m *moduleContext) ExpandSources(srcFiles, excludes []string) Paths {
+	return PathsForModuleSrcExcludes(m, srcFiles, excludes)
 }
 
 // Returns a single path expanded from globs and modules referenced using ":module" syntax.  The property must
 // be tagged with `android:"path" to support automatic source module dependency resolution.
 //
 // Deprecated: use PathForModuleSrc instead.
-func (ctx *androidModuleContext) ExpandSource(srcFile, prop string) Path {
-	return PathForModuleSrc(ctx, srcFile)
+func (m *moduleContext) ExpandSource(srcFile, prop string) Path {
+	return PathForModuleSrc(m, srcFile)
 }
 
 // Returns an optional single path expanded from globs and modules referenced using ":module" syntax if
 // the srcFile is non-nil.  The property must be tagged with `android:"path" to support automatic source module
 // dependency resolution.
-func (ctx *androidModuleContext) ExpandOptionalSource(srcFile *string, prop string) OptionalPath {
+func (m *moduleContext) ExpandOptionalSource(srcFile *string, prop string) OptionalPath {
 	if srcFile != nil {
-		return OptionalPathForPath(PathForModuleSrc(ctx, *srcFile))
+		return OptionalPathForPath(PathForModuleSrc(m, *srcFile))
 	}
 	return OptionalPath{}
 }
 
-func (ctx *androidModuleContext) RequiredModuleNames() []string {
-	return ctx.module.base().commonProperties.Required
+func (m *moduleContext) RequiredModuleNames() []string {
+	return m.module.base().commonProperties.Required
 }
 
-func (ctx *androidModuleContext) HostRequiredModuleNames() []string {
-	return ctx.module.base().commonProperties.Host_required
+func (m *moduleContext) HostRequiredModuleNames() []string {
+	return m.module.base().commonProperties.Host_required
 }
 
-func (ctx *androidModuleContext) TargetRequiredModuleNames() []string {
-	return ctx.module.base().commonProperties.Target_required
+func (m *moduleContext) TargetRequiredModuleNames() []string {
+	return m.module.base().commonProperties.Target_required
 }
 
-func (ctx *androidModuleContext) Glob(globPattern string, excludes []string) Paths {
-	ret, err := ctx.GlobWithDeps(globPattern, excludes)
+func (b *baseModuleContext) Glob(globPattern string, excludes []string) Paths {
+	ret, err := b.GlobWithDeps(globPattern, excludes)
 	if err != nil {
-		ctx.ModuleErrorf("glob: %s", err.Error())
+		b.ModuleErrorf("glob: %s", err.Error())
 	}
-	return pathsForModuleSrcFromFullPath(ctx, ret, true)
+	return pathsForModuleSrcFromFullPath(b, ret, true)
 }
 
-func (ctx *androidModuleContext) GlobFiles(globPattern string, excludes []string) Paths {
-	ret, err := ctx.GlobWithDeps(globPattern, excludes)
+func (b *baseModuleContext) GlobFiles(globPattern string, excludes []string) Paths {
+	ret, err := b.GlobWithDeps(globPattern, excludes)
 	if err != nil {
-		ctx.ModuleErrorf("glob: %s", err.Error())
+		b.ModuleErrorf("glob: %s", err.Error())
 	}
-	return pathsForModuleSrcFromFullPath(ctx, ret, false)
+	return pathsForModuleSrcFromFullPath(b, ret, false)
 }
 
 func init() {
@@ -1628,17 +1781,8 @@
 		return
 	}
 
-	sortedKeys := func(m map[string]Paths) []string {
-		s := make([]string, 0, len(m))
-		for k := range m {
-			s = append(s, k)
-		}
-		sort.Strings(s)
-		return s
-	}
-
 	// Ensure ancestor directories are in modulesInDir
-	dirs := sortedKeys(modulesInDir)
+	dirs := SortedStringKeys(modulesInDir)
 	for _, dir := range dirs {
 		dir := parentDir(dir)
 		for dir != "." && dir != "/" {
@@ -1651,7 +1795,6 @@
 	}
 
 	// Make directories build their direct subdirectories
-	dirs = sortedKeys(modulesInDir)
 	for _, dir := range dirs {
 		p := parentDir(dir)
 		if p != "." && p != "/" {
@@ -1708,8 +1851,7 @@
 	}
 
 	// Wrap those into host|host-cross|target phony rules
-	osClasses := sortedKeys(osClass)
-	for _, class := range osClasses {
+	for _, class := range SortedStringKeys(osClass) {
 		ctx.Build(pctx, BuildParams{
 			Rule:      blueprint.Phony,
 			Output:    PathForPhony(ctx, class),
diff --git a/android/module_test.go b/android/module_test.go
new file mode 100644
index 0000000..c790a68
--- /dev/null
+++ b/android/module_test.go
@@ -0,0 +1,141 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import "testing"
+
+func TestSrcIsModule(t *testing.T) {
+	type args struct {
+		s string
+	}
+	tests := []struct {
+		name       string
+		args       args
+		wantModule string
+	}{
+		{
+			name: "file",
+			args: args{
+				s: "foo",
+			},
+			wantModule: "",
+		},
+		{
+			name: "module",
+			args: args{
+				s: ":foo",
+			},
+			wantModule: "foo",
+		},
+		{
+			name: "tag",
+			args: args{
+				s: ":foo{.bar}",
+			},
+			wantModule: "foo{.bar}",
+		},
+		{
+			name: "extra colon",
+			args: args{
+				s: ":foo:bar",
+			},
+			wantModule: "foo:bar",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if gotModule := SrcIsModule(tt.args.s); gotModule != tt.wantModule {
+				t.Errorf("SrcIsModule() = %v, want %v", gotModule, tt.wantModule)
+			}
+		})
+	}
+}
+
+func TestSrcIsModuleWithTag(t *testing.T) {
+	type args struct {
+		s string
+	}
+	tests := []struct {
+		name       string
+		args       args
+		wantModule string
+		wantTag    string
+	}{
+		{
+			name: "file",
+			args: args{
+				s: "foo",
+			},
+			wantModule: "",
+			wantTag:    "",
+		},
+		{
+			name: "module",
+			args: args{
+				s: ":foo",
+			},
+			wantModule: "foo",
+			wantTag:    "",
+		},
+		{
+			name: "tag",
+			args: args{
+				s: ":foo{.bar}",
+			},
+			wantModule: "foo",
+			wantTag:    ".bar",
+		},
+		{
+			name: "empty tag",
+			args: args{
+				s: ":foo{}",
+			},
+			wantModule: "foo",
+			wantTag:    "",
+		},
+		{
+			name: "extra colon",
+			args: args{
+				s: ":foo:bar",
+			},
+			wantModule: "foo:bar",
+		},
+		{
+			name: "invalid tag",
+			args: args{
+				s: ":foo{.bar",
+			},
+			wantModule: "foo{.bar",
+		},
+		{
+			name: "invalid tag 2",
+			args: args{
+				s: ":foo.bar}",
+			},
+			wantModule: "foo.bar}",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotModule, gotTag := SrcIsModuleWithTag(tt.args.s)
+			if gotModule != tt.wantModule {
+				t.Errorf("SrcIsModuleWithTag() gotModule = %v, want %v", gotModule, tt.wantModule)
+			}
+			if gotTag != tt.wantTag {
+				t.Errorf("SrcIsModuleWithTag() gotTag = %v, want %v", gotTag, tt.wantTag)
+			}
+		})
+	}
+}
diff --git a/android/mutator.go b/android/mutator.go
index 0e80249..070b420 100644
--- a/android/mutator.go
+++ b/android/mutator.go
@@ -66,8 +66,8 @@
 }
 
 type RegisterMutatorsContext interface {
-	TopDown(name string, m AndroidTopDownMutator) MutatorHandle
-	BottomUp(name string, m AndroidBottomUpMutator) MutatorHandle
+	TopDown(name string, m TopDownMutator) MutatorHandle
+	BottomUp(name string, m BottomUpMutator) MutatorHandle
 }
 
 type RegisterMutatorFunc func(RegisterMutatorsContext)
@@ -75,6 +75,8 @@
 var preArch = []RegisterMutatorFunc{
 	registerLoadHookMutator,
 	RegisterNamespaceMutator,
+	// Rename package module types.
+	registerPackageRenamer,
 	RegisterPrebuiltsPreArchMutators,
 	registerVisibilityRuleChecker,
 	RegisterDefaultsPreArchMutators,
@@ -110,52 +112,27 @@
 	postDeps = append(postDeps, f)
 }
 
-type AndroidTopDownMutator func(TopDownMutatorContext)
+type TopDownMutator func(TopDownMutatorContext)
 
 type TopDownMutatorContext interface {
 	BaseModuleContext
-	androidBaseContext
 
-	OtherModuleExists(name string) bool
 	Rename(name string)
-	Module() Module
-
-	OtherModuleName(m blueprint.Module) string
-	OtherModuleDir(m blueprint.Module) string
-	OtherModuleErrorf(m blueprint.Module, fmt string, args ...interface{})
-	OtherModuleDependencyTag(m blueprint.Module) blueprint.DependencyTag
 
 	CreateModule(blueprint.ModuleFactory, ...interface{})
-
-	GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module
-	GetDirectDep(name string) (blueprint.Module, blueprint.DependencyTag)
-
-	VisitDirectDeps(visit func(Module))
-	VisitDirectDepsWithTag(tag blueprint.DependencyTag, visit func(Module))
-	VisitDirectDepsIf(pred func(Module) bool, visit func(Module))
-	VisitDepsDepthFirst(visit func(Module))
-	VisitDepsDepthFirstIf(pred func(Module) bool, visit func(Module))
-	WalkDeps(visit func(Module, Module) bool)
-	// GetWalkPath is supposed to be called in visit function passed in WalkDeps()
-	// and returns a top-down dependency path from a start module to current child module.
-	GetWalkPath() []Module
 }
 
-type androidTopDownMutatorContext struct {
-	blueprint.TopDownMutatorContext
-	androidBaseContextImpl
-	walkPath []Module
+type topDownMutatorContext struct {
+	bp blueprint.TopDownMutatorContext
+	baseModuleContext
 }
 
-type AndroidBottomUpMutator func(BottomUpMutatorContext)
+type BottomUpMutator func(BottomUpMutatorContext)
 
 type BottomUpMutatorContext interface {
 	BaseModuleContext
-	androidBaseContext
 
-	OtherModuleExists(name string) bool
 	Rename(name string)
-	Module() blueprint.Module
 
 	AddDependency(module blueprint.Module, tag blueprint.DependencyTag, name ...string)
 	AddReverseDependency(module blueprint.Module, tag blueprint.DependencyTag, name string)
@@ -168,17 +145,17 @@
 	ReplaceDependencies(string)
 }
 
-type androidBottomUpMutatorContext struct {
-	blueprint.BottomUpMutatorContext
-	androidBaseContextImpl
+type bottomUpMutatorContext struct {
+	bp blueprint.BottomUpMutatorContext
+	baseModuleContext
 }
 
-func (x *registerMutatorsContext) BottomUp(name string, m AndroidBottomUpMutator) MutatorHandle {
+func (x *registerMutatorsContext) BottomUp(name string, m BottomUpMutator) MutatorHandle {
 	f := func(ctx blueprint.BottomUpMutatorContext) {
 		if a, ok := ctx.Module().(Module); ok {
-			actx := &androidBottomUpMutatorContext{
-				BottomUpMutatorContext: ctx,
-				androidBaseContextImpl: a.base().androidBaseContextFactory(ctx),
+			actx := &bottomUpMutatorContext{
+				bp:                ctx,
+				baseModuleContext: a.base().baseModuleContextFactory(ctx),
 			}
 			m(actx)
 		}
@@ -188,12 +165,12 @@
 	return mutator
 }
 
-func (x *registerMutatorsContext) TopDown(name string, m AndroidTopDownMutator) MutatorHandle {
+func (x *registerMutatorsContext) TopDown(name string, m TopDownMutator) MutatorHandle {
 	f := func(ctx blueprint.TopDownMutatorContext) {
 		if a, ok := ctx.Module().(Module); ok {
-			actx := &androidTopDownMutatorContext{
-				TopDownMutatorContext:  ctx,
-				androidBaseContextImpl: a.base().androidBaseContextFactory(ctx),
+			actx := &topDownMutatorContext{
+				bp:                ctx,
+				baseModuleContext: a.base().baseModuleContextFactory(ctx),
 			}
 			m(actx)
 		}
@@ -218,106 +195,13 @@
 	}
 }
 
-func (a *androidTopDownMutatorContext) Config() Config {
-	return a.config
-}
-
-func (a *androidBottomUpMutatorContext) Config() Config {
-	return a.config
-}
-
-func (a *androidTopDownMutatorContext) Module() Module {
-	module, _ := a.TopDownMutatorContext.Module().(Module)
-	return module
-}
-
-func (a *androidTopDownMutatorContext) VisitDirectDeps(visit func(Module)) {
-	a.TopDownMutatorContext.VisitDirectDeps(func(module blueprint.Module) {
-		if aModule, _ := module.(Module); aModule != nil {
-			visit(aModule)
-		}
-	})
-}
-
-func (a *androidTopDownMutatorContext) VisitDirectDepsWithTag(tag blueprint.DependencyTag, visit func(Module)) {
-	a.TopDownMutatorContext.VisitDirectDeps(func(module blueprint.Module) {
-		if aModule, _ := module.(Module); aModule != nil {
-			if a.TopDownMutatorContext.OtherModuleDependencyTag(aModule) == tag {
-				visit(aModule)
-			}
-		}
-	})
-}
-
-func (a *androidTopDownMutatorContext) VisitDirectDepsIf(pred func(Module) bool, visit func(Module)) {
-	a.TopDownMutatorContext.VisitDirectDepsIf(
-		// pred
-		func(module blueprint.Module) bool {
-			if aModule, _ := module.(Module); aModule != nil {
-				return pred(aModule)
-			} else {
-				return false
-			}
-		},
-		// visit
-		func(module blueprint.Module) {
-			visit(module.(Module))
-		})
-}
-
-func (a *androidTopDownMutatorContext) VisitDepsDepthFirst(visit func(Module)) {
-	a.TopDownMutatorContext.VisitDepsDepthFirst(func(module blueprint.Module) {
-		if aModule, _ := module.(Module); aModule != nil {
-			visit(aModule)
-		}
-	})
-}
-
-func (a *androidTopDownMutatorContext) VisitDepsDepthFirstIf(pred func(Module) bool, visit func(Module)) {
-	a.TopDownMutatorContext.VisitDepsDepthFirstIf(
-		// pred
-		func(module blueprint.Module) bool {
-			if aModule, _ := module.(Module); aModule != nil {
-				return pred(aModule)
-			} else {
-				return false
-			}
-		},
-		// visit
-		func(module blueprint.Module) {
-			visit(module.(Module))
-		})
-}
-
-func (a *androidTopDownMutatorContext) WalkDeps(visit func(Module, Module) bool) {
-	a.walkPath = []Module{a.Module()}
-	a.TopDownMutatorContext.WalkDeps(func(child, parent blueprint.Module) bool {
-		childAndroidModule, _ := child.(Module)
-		parentAndroidModule, _ := parent.(Module)
-		if childAndroidModule != nil && parentAndroidModule != nil {
-			// record walkPath before visit
-			for a.walkPath[len(a.walkPath)-1] != parentAndroidModule {
-				a.walkPath = a.walkPath[0 : len(a.walkPath)-1]
-			}
-			a.walkPath = append(a.walkPath, childAndroidModule)
-			return visit(childAndroidModule, parentAndroidModule)
-		} else {
-			return false
-		}
-	})
-}
-
-func (a *androidTopDownMutatorContext) GetWalkPath() []Module {
-	return a.walkPath
-}
-
-func (a *androidTopDownMutatorContext) AppendProperties(props ...interface{}) {
+func (t *topDownMutatorContext) AppendProperties(props ...interface{}) {
 	for _, p := range props {
-		err := proptools.AppendMatchingProperties(a.Module().base().customizableProperties,
+		err := proptools.AppendMatchingProperties(t.Module().base().customizableProperties,
 			p, nil)
 		if err != nil {
 			if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
-				a.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
+				t.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
 			} else {
 				panic(err)
 			}
@@ -325,16 +209,74 @@
 	}
 }
 
-func (a *androidTopDownMutatorContext) PrependProperties(props ...interface{}) {
+func (t *topDownMutatorContext) PrependProperties(props ...interface{}) {
 	for _, p := range props {
-		err := proptools.PrependMatchingProperties(a.Module().base().customizableProperties,
+		err := proptools.PrependMatchingProperties(t.Module().base().customizableProperties,
 			p, nil)
 		if err != nil {
 			if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
-				a.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
+				t.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
 			} else {
 				panic(err)
 			}
 		}
 	}
 }
+
+// android.topDownMutatorContext either has to embed blueprint.TopDownMutatorContext, in which case every method that
+// has an overridden version in android.BaseModuleContext has to be manually forwarded to BaseModuleContext to avoid
+// ambiguous method errors, or it has to store a blueprint.TopDownMutatorContext non-embedded, in which case every
+// non-overridden method has to be forwarded.  There are fewer non-overridden methods, so use the latter.  The following
+// methods forward to the identical blueprint versions for topDownMutatorContext and bottomUpMutatorContext.
+
+func (t *topDownMutatorContext) Rename(name string) {
+	t.bp.Rename(name)
+}
+
+func (t *topDownMutatorContext) CreateModule(factory blueprint.ModuleFactory, props ...interface{}) {
+	t.bp.CreateModule(factory, props...)
+}
+
+func (b *bottomUpMutatorContext) Rename(name string) {
+	b.bp.Rename(name)
+}
+
+func (b *bottomUpMutatorContext) AddDependency(module blueprint.Module, tag blueprint.DependencyTag, name ...string) {
+	b.bp.AddDependency(module, tag, name...)
+}
+
+func (b *bottomUpMutatorContext) AddReverseDependency(module blueprint.Module, tag blueprint.DependencyTag, name string) {
+	b.bp.AddReverseDependency(module, tag, name)
+}
+
+func (b *bottomUpMutatorContext) CreateVariations(variations ...string) []blueprint.Module {
+	return b.bp.CreateVariations(variations...)
+}
+
+func (b *bottomUpMutatorContext) CreateLocalVariations(variations ...string) []blueprint.Module {
+	return b.bp.CreateLocalVariations(variations...)
+}
+
+func (b *bottomUpMutatorContext) SetDependencyVariation(variation string) {
+	b.bp.SetDependencyVariation(variation)
+}
+
+func (b *bottomUpMutatorContext) AddVariationDependencies(variations []blueprint.Variation, tag blueprint.DependencyTag,
+	names ...string) {
+
+	b.bp.AddVariationDependencies(variations, tag, names...)
+}
+
+func (b *bottomUpMutatorContext) AddFarVariationDependencies(variations []blueprint.Variation,
+	tag blueprint.DependencyTag, names ...string) {
+
+	b.bp.AddFarVariationDependencies(variations, tag, names...)
+}
+
+func (b *bottomUpMutatorContext) AddInterVariantDependency(tag blueprint.DependencyTag, from, to blueprint.Module) {
+	b.bp.AddInterVariantDependency(tag, from, to)
+}
+
+func (b *bottomUpMutatorContext) ReplaceDependencies(name string) {
+	b.bp.ReplaceDependencies(name)
+}
diff --git a/android/mutator_test.go b/android/mutator_test.go
new file mode 100644
index 0000000..4cef400
--- /dev/null
+++ b/android/mutator_test.go
@@ -0,0 +1,99 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import (
+	"io/ioutil"
+	"os"
+	"reflect"
+	"testing"
+
+	"github.com/google/blueprint/proptools"
+)
+
+type mutatorTestModule struct {
+	ModuleBase
+	props struct {
+	}
+
+	missingDeps []string
+}
+
+func mutatorTestModuleFactory() Module {
+	module := &mutatorTestModule{}
+	module.AddProperties(&module.props)
+	InitAndroidModule(module)
+	return module
+}
+
+func (m *mutatorTestModule) GenerateAndroidBuildActions(ctx ModuleContext) {
+	ctx.Build(pctx, BuildParams{
+		Rule:   Touch,
+		Output: PathForModuleOut(ctx, "output"),
+	})
+
+	m.missingDeps = ctx.GetMissingDependencies()
+}
+
+func (m *mutatorTestModule) DepsMutator(ctx BottomUpMutatorContext) {
+	ctx.AddDependency(ctx.Module(), nil, "regular_missing_dep")
+}
+
+func addMissingDependenciesMutator(ctx TopDownMutatorContext) {
+	ctx.AddMissingDependencies([]string{"added_missing_dep"})
+}
+
+func TestMutatorAddMissingDependencies(t *testing.T) {
+	buildDir, err := ioutil.TempDir("", "soong_mutator_test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(buildDir)
+
+	config := TestConfig(buildDir, nil)
+	config.TestProductVariables.Allow_missing_dependencies = proptools.BoolPtr(true)
+
+	ctx := NewTestContext()
+	ctx.SetAllowMissingDependencies(true)
+
+	ctx.RegisterModuleType("test", ModuleFactoryAdaptor(mutatorTestModuleFactory))
+	ctx.PreDepsMutators(func(ctx RegisterMutatorsContext) {
+		ctx.TopDown("add_missing_dependencies", addMissingDependenciesMutator)
+	})
+
+	bp := `
+		test {
+			name: "foo",
+		}
+	`
+
+	mockFS := map[string][]byte{
+		"Android.bp": []byte(bp),
+	}
+
+	ctx.MockFileSystem(mockFS)
+
+	ctx.Register()
+	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
+	FailIfErrored(t, errs)
+	_, errs = ctx.PrepareBuildActions(config)
+	FailIfErrored(t, errs)
+
+	foo := ctx.ModuleForTests("foo", "").Module().(*mutatorTestModule)
+
+	if g, w := foo.missingDeps, []string{"added_missing_dep", "regular_missing_dep"}; !reflect.DeepEqual(g, w) {
+		t.Errorf("want foo missing deps %q, got %q", w, g)
+	}
+}
diff --git a/android/namespace.go b/android/namespace.go
index 78d7f3c..27ec163 100644
--- a/android/namespace.go
+++ b/android/namespace.go
@@ -222,6 +222,11 @@
 }
 
 func (r *NameResolver) getNamespacesToSearchForModule(sourceNamespace *Namespace) (searchOrder []*Namespace) {
+	if sourceNamespace.visibleNamespaces == nil {
+		// When handling dependencies before namespaceMutator, assume they are non-Soong Blueprint modules and give
+		// access to all namespaces.
+		return r.sortedNamespaces.sortedItems()
+	}
 	return sourceNamespace.visibleNamespaces
 }
 
diff --git a/android/namespace_test.go b/android/namespace_test.go
index 9a791a5..20241fe 100644
--- a/android/namespace_test.go
+++ b/android/namespace_test.go
@@ -16,8 +16,6 @@
 
 import (
 	"errors"
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"reflect"
 	"testing"
@@ -93,6 +91,28 @@
 	// setupTest will report any errors
 }
 
+func TestDependingOnBlueprintModuleInRootNamespace(t *testing.T) {
+	_ = setupTest(t,
+		map[string]string{
+			".": `
+			blueprint_test_module {
+				name: "a",
+			}
+			`,
+			"dir1": `
+			soong_namespace {
+			}
+			blueprint_test_module {
+				name: "b",
+				deps: ["a"],
+			}
+			`,
+		},
+	)
+
+	// setupTest will report any errors
+}
+
 func TestDependingOnModuleInImportedNamespace(t *testing.T) {
 	ctx := setupTest(t,
 		map[string]string{
@@ -613,18 +633,13 @@
 }
 
 func setupTestFromFiles(bps map[string][]byte) (ctx *TestContext, errs []error) {
-	buildDir, err := ioutil.TempDir("", "soong_namespace_test")
-	if err != nil {
-		return nil, []error{err}
-	}
-	defer os.RemoveAll(buildDir)
-
 	config := TestConfig(buildDir, nil)
 
 	ctx = NewTestContext()
 	ctx.MockFileSystem(bps)
 	ctx.RegisterModuleType("test_module", ModuleFactoryAdaptor(newTestModule))
 	ctx.RegisterModuleType("soong_namespace", ModuleFactoryAdaptor(NamespaceFactory))
+	ctx.RegisterModuleType("blueprint_test_module", newBlueprintTestModule)
 	ctx.PreArchMutators(RegisterNamespaceMutator)
 	ctx.PreDepsMutators(func(ctx RegisterMutatorsContext) {
 		ctx.BottomUp("rename", renameMutator)
@@ -649,6 +664,7 @@
 }
 
 func setupTest(t *testing.T, bps map[string]string) (ctx *TestContext) {
+	t.Helper()
 	ctx, errs := setupTestExpectErrs(bps)
 	FailIfErrored(t, errs)
 	return ctx
@@ -726,3 +742,22 @@
 	InitAndroidModule(m)
 	return m
 }
+
+type blueprintTestModule struct {
+	blueprint.SimpleName
+	properties struct {
+		Deps []string
+	}
+}
+
+func (b *blueprintTestModule) DynamicDependencies(ctx blueprint.DynamicDependerModuleContext) []string {
+	return b.properties.Deps
+}
+
+func (b *blueprintTestModule) GenerateBuildActions(blueprint.ModuleContext) {
+}
+
+func newBlueprintTestModule() (blueprint.Module, []interface{}) {
+	m := &blueprintTestModule{}
+	return m, []interface{}{&m.properties, &m.SimpleName.Properties}
+}
diff --git a/android/neverallow.go b/android/neverallow.go
index 9314483..f35d1fe 100644
--- a/android/neverallow.go
+++ b/android/neverallow.go
@@ -95,15 +95,17 @@
 		"external/icu",
 		"external/okhttp",
 		"external/wycheproof",
+
+		// Not really a core library but still needs access to same capabilities.
+		"development",
 	}
 
-	// Core library constraints. The no_standard_libs can only be used in core
-	// library projects. Access to core library targets is restricted using
-	// visibility rules.
+	// Core library constraints. The sdk_version: "none" can only be used in core library projects.
+	// Access to core library targets is restricted using visibility rules.
 	rules := []*rule{
 		neverallow().
-			notIn(append(coreLibraryProjects, "development")...).
-			with("no_standard_libs", "true"),
+			notIn(coreLibraryProjects...).
+			with("sdk_version", "none"),
 	}
 
 	return rules
diff --git a/android/neverallow_test.go b/android/neverallow_test.go
index 00c51ea..ee3c94f 100644
--- a/android/neverallow_test.go
+++ b/android/neverallow_test.go
@@ -15,8 +15,6 @@
 package android
 
 import (
-	"io/ioutil"
-	"os"
 	"testing"
 )
 
@@ -148,15 +146,41 @@
 		},
 		expectedError: "java_device_for_host can only be used in whitelisted projects",
 	},
+	// Libcore rule tests
+	{
+		name: "sdk_version: \"none\" inside core libraries",
+		fs: map[string][]byte{
+			"libcore/Blueprints": []byte(`
+				java_library {
+					name: "inside_core_libraries",
+					sdk_version: "none",
+				}`),
+		},
+	},
+	{
+		name: "sdk_version: \"none\" outside core libraries",
+		fs: map[string][]byte{
+			"Blueprints": []byte(`
+				java_library {
+					name: "outside_core_libraries",
+					sdk_version: "none",
+				}`),
+		},
+		expectedError: "module \"outside_core_libraries\": violates neverallow",
+	},
+	{
+		name: "sdk_version: \"current\"",
+		fs: map[string][]byte{
+			"Blueprints": []byte(`
+				java_library {
+					name: "outside_core_libraries",
+					sdk_version: "current",
+				}`),
+		},
+	},
 }
 
 func TestNeverallow(t *testing.T) {
-	buildDir, err := ioutil.TempDir("", "soong_neverallow_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(buildDir)
-
 	config := TestConfig(buildDir, nil)
 
 	for _, test := range neverallowTests {
@@ -176,6 +200,7 @@
 	ctx := NewTestContext()
 	ctx.RegisterModuleType("cc_library", ModuleFactoryAdaptor(newMockCcLibraryModule))
 	ctx.RegisterModuleType("java_library", ModuleFactoryAdaptor(newMockJavaLibraryModule))
+	ctx.RegisterModuleType("java_library_host", ModuleFactoryAdaptor(newMockJavaLibraryModule))
 	ctx.RegisterModuleType("java_device_for_host", ModuleFactoryAdaptor(newMockJavaLibraryModule))
 	ctx.PostDepsMutators(registerNeverallowMutator)
 	ctx.Register()
@@ -227,7 +252,8 @@
 }
 
 type mockJavaLibraryProperties struct {
-	Libs []string
+	Libs        []string
+	Sdk_version *string
 }
 
 type mockJavaLibraryModule struct {
diff --git a/android/notices.go b/android/notices.go
new file mode 100644
index 0000000..dbb88fc
--- /dev/null
+++ b/android/notices.go
@@ -0,0 +1,87 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import (
+	"path/filepath"
+
+	"github.com/google/blueprint"
+)
+
+func init() {
+	pctx.SourcePathVariable("merge_notices", "build/soong/scripts/mergenotice.py")
+	pctx.SourcePathVariable("generate_notice", "build/make/tools/generate-notice-files.py")
+
+	pctx.HostBinToolVariable("minigzip", "minigzip")
+}
+
+var (
+	mergeNoticesRule = pctx.AndroidStaticRule("mergeNoticesRule", blueprint.RuleParams{
+		Command:     `${merge_notices} --output $out $in`,
+		CommandDeps: []string{"${merge_notices}"},
+		Description: "merge notice files into $out",
+	})
+
+	generateNoticeRule = pctx.AndroidStaticRule("generateNoticeRule", blueprint.RuleParams{
+		Command: `rm -rf $tmpDir $$(dirname $out) && ` +
+			`mkdir -p $tmpDir $$(dirname $out) && ` +
+			`${generate_notice} --text-output $tmpDir/NOTICE.txt --html-output $tmpDir/NOTICE.html -t "$title" -s $inputDir && ` +
+			`${minigzip} -c $tmpDir/NOTICE.html > $out`,
+		CommandDeps: []string{"${generate_notice}", "${minigzip}"},
+		Description: "produce notice file $out",
+	}, "tmpDir", "title", "inputDir")
+)
+
+func MergeNotices(ctx ModuleContext, mergedNotice WritablePath, noticePaths []Path) {
+	ctx.Build(pctx, BuildParams{
+		Rule:        mergeNoticesRule,
+		Description: "merge notices",
+		Inputs:      noticePaths,
+		Output:      mergedNotice,
+	})
+}
+
+func BuildNoticeOutput(ctx ModuleContext, installPath OutputPath, installFilename string,
+	noticePaths []Path) ModuleOutPath {
+	// Merge all NOTICE files into one.
+	// TODO(jungjw): We should just produce a well-formatted NOTICE.html file in a single pass.
+	//
+	// generate-notice-files.py, which processes the merged NOTICE file, has somewhat strict rules
+	// about input NOTICE file paths.
+	// 1. Their relative paths to the src root become their NOTICE index titles. We want to use
+	// on-device paths as titles, and so output the merged NOTICE file the corresponding location.
+	// 2. They must end with .txt extension. Otherwise, they're ignored.
+	noticeRelPath := InstallPathToOnDevicePath(ctx, installPath.Join(ctx, installFilename+".txt"))
+	mergedNotice := PathForModuleOut(ctx, filepath.Join("NOTICE_FILES/src", noticeRelPath))
+	MergeNotices(ctx, mergedNotice, noticePaths)
+
+	// Transform the merged NOTICE file into a gzipped HTML file.
+	noticeOutput := PathForModuleOut(ctx, "NOTICE", "NOTICE.html.gz")
+	tmpDir := PathForModuleOut(ctx, "NOTICE_tmp")
+	title := "Notices for " + ctx.ModuleName()
+	ctx.Build(pctx, BuildParams{
+		Rule:        generateNoticeRule,
+		Description: "generate notice output",
+		Input:       mergedNotice,
+		Output:      noticeOutput,
+		Args: map[string]string{
+			"tmpDir":   tmpDir.String(),
+			"title":    title,
+			"inputDir": PathForModuleOut(ctx, "NOTICE_FILES/src").String(),
+		},
+	})
+
+	return noticeOutput
+}
diff --git a/android/override_module.go b/android/override_module.go
index 5a57c93..22fb7de 100644
--- a/android/override_module.go
+++ b/android/override_module.go
@@ -95,8 +95,6 @@
 
 // Base module struct for overridable module types
 type OverridableModuleBase struct {
-	ModuleBase
-
 	// List of OverrideModules that override this base module
 	overrides []OverrideModule
 	// Used to parallelize registerOverrideMutator executions. Note that only addOverride locks this
@@ -144,7 +142,7 @@
 	// Adds the base module to the overrides property, if exists, of the overriding module. See the
 	// comment on OverridableModuleBase.overridesProperty for details.
 	if b.overridesProperty != nil {
-		*b.overridesProperty = append(*b.overridesProperty, b.Name())
+		*b.overridesProperty = append(*b.overridesProperty, ctx.ModuleName())
 	}
 	for _, p := range b.overridableProperties {
 		for _, op := range o.getOverridingProperties() {
diff --git a/android/package.go b/android/package.go
new file mode 100644
index 0000000..03f6a1e
--- /dev/null
+++ b/android/package.go
@@ -0,0 +1,194 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package android
+
+import (
+	"fmt"
+	"sync/atomic"
+
+	"github.com/google/blueprint"
+)
+
+func init() {
+	RegisterModuleType("package", PackageFactory)
+}
+
+// The information maintained about each package.
+type packageInfo struct {
+	// The module from which this information was populated. If `duplicated` = true then this is the
+	// module that has been renamed and must be used to report errors.
+	module *packageModule
+
+	// If true this indicates that there are two package statements in the same package which is not
+	// allowed and will cause the build to fail. This flag is set by packageRenamer and checked in
+	// packageErrorReporter
+	duplicated bool
+}
+
+type packageProperties struct {
+	Name string `blueprint:"mutated"`
+
+	// Specifies the default visibility for all modules defined in this package.
+	Default_visibility []string
+}
+
+type packageModule struct {
+	ModuleBase
+
+	properties  packageProperties
+	packageInfo *packageInfo
+}
+
+func (p *packageModule) GenerateAndroidBuildActions(ModuleContext) {
+	// Nothing to do.
+}
+
+func (p *packageModule) GenerateBuildActions(ctx blueprint.ModuleContext) {
+	// Nothing to do.
+}
+
+func (p *packageModule) qualifiedModuleId(ctx BaseModuleContext) qualifiedModuleName {
+	// Override to create a package id.
+	return newPackageId(ctx.ModuleDir())
+}
+
+// Override to ensure that the default_visibility rules are checked by the visibility module during
+// its checking phase.
+func (p *packageModule) visibilityProperties() []visibilityProperty {
+	return []visibilityProperty{
+		newVisibilityProperty("default_visibility", func() []string {
+			return p.properties.Default_visibility
+		}),
+	}
+}
+
+func (p *packageModule) Name() string {
+	return p.properties.Name
+}
+
+func (p *packageModule) setName(name string) {
+	p.properties.Name = name
+}
+
+// Counter to ensure package modules are created with a unique name within whatever namespace they
+// belong.
+var packageCount uint32 = 0
+
+func PackageFactory() Module {
+	module := &packageModule{}
+
+	// Get a unique if for the package. Has to be done atomically as the creation of the modules are
+	// done in parallel.
+	id := atomic.AddUint32(&packageCount, 1)
+	name := fmt.Sprintf("soong_package_%d", id)
+
+	module.properties.Name = name
+
+	module.AddProperties(&module.properties)
+	return module
+}
+
+// Registers the function that renames the packages.
+func registerPackageRenamer(ctx RegisterMutatorsContext) {
+	ctx.BottomUp("packageRenamer", packageRenamer).Parallel()
+	ctx.BottomUp("packageErrorReporter", packageErrorReporter).Parallel()
+}
+
+// Renames the package to match the package directory.
+//
+// This also creates a PackageInfo object for each package and uses that to detect and remember
+// duplicates for later error reporting.
+func packageRenamer(ctx BottomUpMutatorContext) {
+	m, ok := ctx.Module().(*packageModule)
+	if !ok {
+		return
+	}
+
+	packageName := "//" + ctx.ModuleDir()
+
+	pi := newPackageInfo(ctx, packageName, m)
+	if pi.module != m {
+		// Remember that the package was duplicated but do not rename as that will cause an error to
+		// be logged with the generated name. Similarly, reporting the error here will use the generated
+		// name as renames are only processed after this phase.
+		pi.duplicated = true
+	} else {
+		// This is the first package module in this package so rename it to match the package name.
+		m.setName(packageName)
+		ctx.Rename(packageName)
+
+		// Store a package info reference in the module.
+		m.packageInfo = pi
+	}
+}
+
+// Logs any deferred errors.
+func packageErrorReporter(ctx BottomUpMutatorContext) {
+	m, ok := ctx.Module().(*packageModule)
+	if !ok {
+		return
+	}
+
+	packageDir := ctx.ModuleDir()
+	packageName := "//" + packageDir
+
+	// Get the PackageInfo for the package. Should have been populated in the packageRenamer phase.
+	pi := findPackageInfo(ctx, packageName)
+	if pi == nil {
+		ctx.ModuleErrorf("internal error, expected package info to be present for package '%s'",
+			packageName)
+		return
+	}
+
+	if pi.module != m {
+		// The package module has been duplicated but this is not the module that has been renamed so
+		// ignore it. An error will be logged for the renamed module which will ensure that the error
+		// message uses the correct name.
+		return
+	}
+
+	// Check to see whether there are duplicate package modules in the package.
+	if pi.duplicated {
+		ctx.ModuleErrorf("package {...} specified multiple times")
+		return
+	}
+}
+
+type defaultPackageInfoKey string
+
+func newPackageInfo(
+	ctx BaseModuleContext, packageName string, module *packageModule) *packageInfo {
+	key := NewCustomOnceKey(defaultPackageInfoKey(packageName))
+
+	return ctx.Config().Once(key, func() interface{} {
+		return &packageInfo{module: module}
+	}).(*packageInfo)
+}
+
+// Get the PackageInfo for the package name (starts with //, no trailing /), is nil if no package
+// module type was specified.
+func findPackageInfo(ctx BaseModuleContext, packageName string) *packageInfo {
+	key := NewCustomOnceKey(defaultPackageInfoKey(packageName))
+
+	pi := ctx.Config().Once(key, func() interface{} {
+		return nil
+	})
+
+	if pi == nil {
+		return nil
+	} else {
+		return pi.(*packageInfo)
+	}
+}
diff --git a/android/package_test.go b/android/package_test.go
new file mode 100644
index 0000000..f1f47ac
--- /dev/null
+++ b/android/package_test.go
@@ -0,0 +1,111 @@
+package android
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+var packageTests = []struct {
+	name           string
+	fs             map[string][]byte
+	expectedErrors []string
+}{
+	// Package default_visibility handling is tested in visibility_test.go
+	{
+		name: "package must not accept visibility and name properties",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					name: "package",
+					visibility: ["//visibility:private"],
+				}`),
+		},
+		expectedErrors: []string{
+			`top/Blueprints:3:10: mutated field name cannot be set in a Blueprint file`,
+			`top/Blueprints:4:16: unrecognized property "visibility"`,
+		},
+	},
+	{
+		name: "multiple packages in separate directories",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+				}`),
+			"other/Blueprints": []byte(`
+				package {
+				}`),
+			"other/nested/Blueprints": []byte(`
+				package {
+				}`),
+		},
+	},
+	{
+		name: "package must not be specified more than once per package",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					default_visibility: ["//visibility:private"],
+				}
+
+        package {
+				}`),
+		},
+		expectedErrors: []string{
+			`module "//top": package {...} specified multiple times`,
+		},
+	},
+}
+
+func TestPackage(t *testing.T) {
+	buildDir, err := ioutil.TempDir("", "soong_package_test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(buildDir)
+
+	for _, test := range packageTests {
+		t.Run(test.name, func(t *testing.T) {
+			_, errs := testPackage(buildDir, test.fs)
+
+			expectedErrors := test.expectedErrors
+			if expectedErrors == nil {
+				FailIfErrored(t, errs)
+			} else {
+				for _, expectedError := range expectedErrors {
+					FailIfNoMatchingErrors(t, expectedError, errs)
+				}
+				if len(errs) > len(expectedErrors) {
+					t.Errorf("additional errors found, expected %d, found %d", len(expectedErrors), len(errs))
+					for i, expectedError := range expectedErrors {
+						t.Errorf("expectedErrors[%d] = %s", i, expectedError)
+					}
+					for i, err := range errs {
+						t.Errorf("errs[%d] = %s", i, err)
+					}
+				}
+			}
+		})
+	}
+}
+
+func testPackage(buildDir string, fs map[string][]byte) (*TestContext, []error) {
+
+	// Create a new config per test as visibility information is stored in the config.
+	config := TestArchConfig(buildDir, nil)
+
+	ctx := NewTestArchContext()
+	ctx.RegisterModuleType("package", ModuleFactoryAdaptor(PackageFactory))
+	ctx.PreArchMutators(registerPackageRenamer)
+	ctx.Register()
+
+	ctx.MockFileSystem(fs)
+
+	_, errs := ctx.ParseBlueprintsFiles(".")
+	if len(errs) > 0 {
+		return ctx, errs
+	}
+
+	_, errs = ctx.PrepareBuildActions(config)
+	return ctx, errs
+}
diff --git a/android/path_properties.go b/android/path_properties.go
index 1a12290..af7af59 100644
--- a/android/path_properties.go
+++ b/android/path_properties.go
@@ -39,14 +39,12 @@
 		pathProperties := pathPropertiesForPropertyStruct(ctx, ps)
 		pathProperties = FirstUniqueStrings(pathProperties)
 
-		var deps []string
 		for _, s := range pathProperties {
-			if m := SrcIsModule(s); m != "" {
-				deps = append(deps, m)
+			if m, t := SrcIsModuleWithTag(s); m != "" {
+				ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
 			}
 		}
 
-		ctx.AddDependency(ctx.Module(), SourceDepTag, deps...)
 	}
 }
 
diff --git a/android/path_properties_test.go b/android/path_properties_test.go
index ecc2d21..fa187fa 100644
--- a/android/path_properties_test.go
+++ b/android/path_properties_test.go
@@ -41,8 +41,10 @@
 }
 
 func (p *pathDepsMutatorTestModule) GenerateAndroidBuildActions(ctx ModuleContext) {
-	ctx.VisitDirectDepsWithTag(SourceDepTag, func(dep Module) {
-		p.sourceDeps = append(p.sourceDeps, ctx.OtherModuleName(dep))
+	ctx.VisitDirectDeps(func(dep Module) {
+		if _, ok := ctx.OtherModuleDependencyTag(dep).(sourceOrOutputDependencyTag); ok {
+			p.sourceDeps = append(p.sourceDeps, ctx.OtherModuleName(dep))
+		}
 	})
 }
 
@@ -59,7 +61,7 @@
 				name: "foo",
 				foo: ":a",
 				bar: [":b"],
-				baz: ":c",
+				baz: ":c{.bar}",
 				qux: ":d",
 			}`,
 			deps: []string{"a", "b", "c"},
diff --git a/android/paths.go b/android/paths.go
index da387a8..20b8b82 100644
--- a/android/paths.go
+++ b/android/paths.go
@@ -41,9 +41,7 @@
 var _ PathContext = ModuleContext(nil)
 
 type ModuleInstallPathContext interface {
-	PathContext
-
-	androidBaseContext
+	BaseModuleContext
 
 	InstallInData() bool
 	InstallInSanitizerDir() bool
@@ -217,21 +215,23 @@
 	return ret
 }
 
-// PathsForModuleSrc returns Paths rooted from the module's local source directory.  It expands globs and references
-// to SourceFileProducer modules using the ":name" syntax.  Properties passed as the paths argument must have been
-// annotated with struct tag `android:"path"` so that dependencies on SourceFileProducer modules will have already
-// been handled by the path_properties mutator.  If ctx.Config().AllowMissingDependencies() is true, then any missing
-// SourceFileProducer dependencies will cause the module to be marked as having missing dependencies.
+// PathsForModuleSrc returns Paths rooted from the module's local source directory.  It expands globs, references to
+// SourceFileProducer modules using the ":name" syntax, and references to OutputFileProducer modules using the
+// ":name{.tag}" syntax.  Properties passed as the paths argument must have been annotated with struct tag
+// `android:"path"` so that dependencies on SourceFileProducer modules will have already been handled by the
+// path_properties mutator.  If ctx.Config().AllowMissingDependencies() is true then any missing SourceFileProducer or
+// OutputFileProducer dependencies will cause the module to be marked as having missing dependencies.
 func PathsForModuleSrc(ctx ModuleContext, paths []string) Paths {
 	return PathsForModuleSrcExcludes(ctx, paths, nil)
 }
 
 // PathsForModuleSrcExcludes returns Paths rooted from the module's local source directory, excluding paths listed in
-// the excludes arguments.  It expands globs and references to SourceFileProducer modules in both paths and excludes
-// using the ":name" syntax.  Properties passed as the paths or excludes argument must have been annotated with struct
-// tag `android:"path"` so that dependencies on SourceFileProducer modules will have already been handled by the
-// path_properties mutator.  If ctx.Config().AllowMissingDependencies() is true, then any missing SourceFileProducer
-// dependencies will cause the module to be marked as having missing dependencies.
+// the excludes arguments.  It expands globs, references to SourceFileProducer modules using the ":name" syntax, and
+// references to OutputFileProducer modules using the ":name{.tag}" syntax.  Properties passed as the paths or excludes
+// argument must have been annotated with struct tag `android:"path"` so that dependencies on SourceFileProducer modules
+// will have already been handled by the path_properties mutator.  If ctx.Config().AllowMissingDependencies() is
+// truethen any missing SourceFileProducer or OutputFileProducer dependencies will cause the module to be marked as
+// having missing dependencies.
 func PathsForModuleSrcExcludes(ctx ModuleContext, paths, excludes []string) Paths {
 	ret, missingDeps := PathsAndMissingDepsForModuleSrcExcludes(ctx, paths, excludes)
 	if ctx.Config().AllowMissingDependencies() {
@@ -245,12 +245,13 @@
 }
 
 // PathsAndMissingDepsForModuleSrcExcludes returns Paths rooted from the module's local source directory, excluding
-// paths listed in the excludes arguments, and a list of missing dependencies.  It expands globs and references to
-// SourceFileProducer modules in both paths and excludes using the ":name" syntax.  Properties passed as the paths or
-// excludes argument must have been annotated with struct tag `android:"path"` so that dependencies on
-// SourceFileProducer modules will have already been handled by the path_properties mutator.  If
-// ctx.Config().AllowMissingDependencies() is true, then any missing SourceFileProducer dependencies will be returned,
-// and they will NOT cause the module to be marked as having missing dependencies.
+// paths listed in the excludes arguments, and a list of missing dependencies.  It expands globs, references to
+// SourceFileProducer modules using the ":name" syntax, and references to OutputFileProducer modules using the
+// ":name{.tag}" syntax.  Properties passed as the paths or excludes argument must have been annotated with struct tag
+// `android:"path"` so that dependencies on SourceFileProducer modules will have already been handled by the
+// path_properties mutator.  If ctx.Config().AllowMissingDependencies() is true then any missing SourceFileProducer or
+// OutputFileProducer dependencies will be returned, and they will NOT cause the module to be marked as having missing
+// dependencies.
 func PathsAndMissingDepsForModuleSrcExcludes(ctx ModuleContext, paths, excludes []string) (Paths, []string) {
 	prefix := pathForModuleSrc(ctx).String()
 
@@ -262,16 +263,24 @@
 	var missingExcludeDeps []string
 
 	for _, e := range excludes {
-		if m := SrcIsModule(e); m != "" {
-			module := ctx.GetDirectDepWithTag(m, SourceDepTag)
+		if m, t := SrcIsModuleWithTag(e); m != "" {
+			module := ctx.GetDirectDepWithTag(m, sourceOrOutputDepTag(t))
 			if module == nil {
 				missingExcludeDeps = append(missingExcludeDeps, m)
 				continue
 			}
-			if srcProducer, ok := module.(SourceFileProducer); ok {
+			if outProducer, ok := module.(OutputFileProducer); ok {
+				outputFiles, err := outProducer.OutputFiles(t)
+				if err != nil {
+					ctx.ModuleErrorf("path dependency %q: %s", e, err)
+				}
+				expandedExcludes = append(expandedExcludes, outputFiles.Strings()...)
+			} else if t != "" {
+				ctx.ModuleErrorf("path dependency %q is not an output file producing module", e)
+			} else if srcProducer, ok := module.(SourceFileProducer); ok {
 				expandedExcludes = append(expandedExcludes, srcProducer.Srcs().Strings()...)
 			} else {
-				ctx.ModuleErrorf("srcs dependency %q is not a source file producing module", m)
+				ctx.ModuleErrorf("path dependency %q is not a source file producing module", e)
 			}
 		} else {
 			expandedExcludes = append(expandedExcludes, filepath.Join(prefix, e))
@@ -307,12 +316,20 @@
 }
 
 func expandOneSrcPath(ctx ModuleContext, s string, expandedExcludes []string) (Paths, error) {
-	if m := SrcIsModule(s); m != "" {
-		module := ctx.GetDirectDepWithTag(m, SourceDepTag)
+	if m, t := SrcIsModuleWithTag(s); m != "" {
+		module := ctx.GetDirectDepWithTag(m, sourceOrOutputDepTag(t))
 		if module == nil {
 			return nil, missingDependencyError{[]string{m}}
 		}
-		if srcProducer, ok := module.(SourceFileProducer); ok {
+		if outProducer, ok := module.(OutputFileProducer); ok {
+			outputFiles, err := outProducer.OutputFiles(t)
+			if err != nil {
+				return nil, fmt.Errorf("path dependency %q: %s", s, err)
+			}
+			return outputFiles, nil
+		} else if t != "" {
+			return nil, fmt.Errorf("path dependency %q is not an output file producing module", s)
+		} else if srcProducer, ok := module.(SourceFileProducer); ok {
 			moduleSrcs := srcProducer.Srcs()
 			for _, e := range expandedExcludes {
 				for j := 0; j < len(moduleSrcs); j++ {
@@ -324,7 +341,7 @@
 			}
 			return moduleSrcs, nil
 		} else {
-			return nil, fmt.Errorf("path dependency %q is not a source file producing module", m)
+			return nil, fmt.Errorf("path dependency %q is not a source file producing module", s)
 		}
 	} else if pathtools.IsGlob(s) {
 		paths := ctx.GlobFiles(pathForModuleSrc(ctx, s).String(), expandedExcludes)
@@ -350,7 +367,7 @@
 // each string. If incDirs is false, strip paths with a trailing '/' from the list.
 // It intended for use in globs that only list files that exist, so it allows '$' in
 // filenames.
-func pathsForModuleSrcFromFullPath(ctx ModuleContext, paths []string, incDirs bool) Paths {
+func pathsForModuleSrcFromFullPath(ctx BaseModuleContext, paths []string, incDirs bool) Paths {
 	prefix := filepath.Join(ctx.Config().srcDir, ctx.ModuleDir()) + "/"
 	if prefix == "./" {
 		prefix = ""
diff --git a/android/paths_test.go b/android/paths_test.go
index b52d713..7bcfe41 100644
--- a/android/paths_test.go
+++ b/android/paths_test.go
@@ -17,8 +17,6 @@
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
-	"os"
 	"reflect"
 	"strings"
 	"testing"
@@ -200,7 +198,7 @@
 }
 
 type moduleInstallPathContextImpl struct {
-	androidBaseContextImpl
+	baseModuleContext
 
 	inData         bool
 	inSanitizerDir bool
@@ -212,7 +210,7 @@
 }
 
 func (m moduleInstallPathContextImpl) Config() Config {
-	return m.androidBaseContextImpl.config
+	return m.baseModuleContext.config
 }
 
 func (moduleInstallPathContextImpl) AddNinjaFileDeps(deps ...string) {}
@@ -244,7 +242,7 @@
 		{
 			name: "host binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: hostTarget,
 				},
 			},
@@ -255,7 +253,7 @@
 		{
 			name: "system binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 				},
 			},
@@ -265,7 +263,7 @@
 		{
 			name: "vendor binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   socSpecificModule,
 				},
@@ -276,7 +274,7 @@
 		{
 			name: "odm binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   deviceSpecificModule,
 				},
@@ -287,7 +285,7 @@
 		{
 			name: "product binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   productSpecificModule,
 				},
@@ -298,7 +296,7 @@
 		{
 			name: "product_services binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   productServicesSpecificModule,
 				},
@@ -310,7 +308,7 @@
 		{
 			name: "system native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 				},
 				inData: true,
@@ -321,7 +319,7 @@
 		{
 			name: "vendor native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   socSpecificModule,
 				},
@@ -333,7 +331,7 @@
 		{
 			name: "odm native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   deviceSpecificModule,
 				},
@@ -345,7 +343,7 @@
 		{
 			name: "product native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   productSpecificModule,
 				},
@@ -358,7 +356,7 @@
 		{
 			name: "product_services native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   productServicesSpecificModule,
 				},
@@ -371,7 +369,7 @@
 		{
 			name: "sanitized system binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 				},
 				inSanitizerDir: true,
@@ -382,7 +380,7 @@
 		{
 			name: "sanitized vendor binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   socSpecificModule,
 				},
@@ -394,7 +392,7 @@
 		{
 			name: "sanitized odm binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   deviceSpecificModule,
 				},
@@ -406,7 +404,7 @@
 		{
 			name: "sanitized product binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   productSpecificModule,
 				},
@@ -419,7 +417,7 @@
 		{
 			name: "sanitized product_services binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   productServicesSpecificModule,
 				},
@@ -432,7 +430,7 @@
 		{
 			name: "sanitized system native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 				},
 				inData:         true,
@@ -444,7 +442,7 @@
 		{
 			name: "sanitized vendor native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   socSpecificModule,
 				},
@@ -457,7 +455,7 @@
 		{
 			name: "sanitized odm native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   deviceSpecificModule,
 				},
@@ -470,7 +468,7 @@
 		{
 			name: "sanitized product native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   productSpecificModule,
 				},
@@ -483,7 +481,7 @@
 		{
 			name: "sanitized product_services native test binary",
 			ctx: &moduleInstallPathContextImpl{
-				androidBaseContextImpl: androidBaseContextImpl{
+				baseModuleContext: baseModuleContext{
 					target: deviceTarget,
 					kind:   productServicesSpecificModule,
 				},
@@ -497,7 +495,7 @@
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			tc.ctx.androidBaseContextImpl.config = testConfig
+			tc.ctx.baseModuleContext.config = testConfig
 			output := PathForModuleInstall(tc.ctx, tc.in...)
 			if output.basePath.path != tc.out {
 				t.Errorf("unexpected path:\n got: %q\nwant: %q\n",
@@ -758,6 +756,50 @@
 	if !p.props.Module_handles_missing_deps {
 		p.missingDeps = ctx.GetMissingDependencies()
 	}
+
+	ctx.Build(pctx, BuildParams{
+		Rule:   Touch,
+		Output: PathForModuleOut(ctx, "output"),
+	})
+}
+
+type pathForModuleSrcOutputFileProviderModule struct {
+	ModuleBase
+	props struct {
+		Outs   []string
+		Tagged []string
+	}
+
+	outs   Paths
+	tagged Paths
+}
+
+func pathForModuleSrcOutputFileProviderModuleFactory() Module {
+	module := &pathForModuleSrcOutputFileProviderModule{}
+	module.AddProperties(&module.props)
+	InitAndroidModule(module)
+	return module
+}
+
+func (p *pathForModuleSrcOutputFileProviderModule) GenerateAndroidBuildActions(ctx ModuleContext) {
+	for _, out := range p.props.Outs {
+		p.outs = append(p.outs, PathForModuleOut(ctx, out))
+	}
+
+	for _, tagged := range p.props.Tagged {
+		p.tagged = append(p.tagged, PathForModuleOut(ctx, tagged))
+	}
+}
+
+func (p *pathForModuleSrcOutputFileProviderModule) OutputFiles(tag string) (Paths, error) {
+	switch tag {
+	case "":
+		return p.outs, nil
+	case ".tagged":
+		return p.tagged, nil
+	default:
+		return nil, fmt.Errorf("unsupported tag %q", tag)
+	}
 }
 
 type pathForModuleSrcTestCase struct {
@@ -776,6 +818,7 @@
 			ctx := NewTestContext()
 
 			ctx.RegisterModuleType("test", ModuleFactoryAdaptor(pathForModuleSrcTestModuleFactory))
+			ctx.RegisterModuleType("output_file_provider", ModuleFactoryAdaptor(pathForModuleSrcOutputFileProviderModuleFactory))
 			ctx.RegisterModuleType("filegroup", ModuleFactoryAdaptor(FileGroupFactory))
 
 			fgBp := `
@@ -785,9 +828,18 @@
 				}
 			`
 
+			ofpBp := `
+				output_file_provider {
+					name: "b",
+					outs: ["gen/b"],
+					tagged: ["gen/c"],
+				}
+			`
+
 			mockFS := map[string][]byte{
 				"fg/Android.bp":     []byte(fgBp),
 				"foo/Android.bp":    []byte(test.bp),
+				"ofp/Android.bp":    []byte(ofpBp),
 				"fg/src/a":          nil,
 				"foo/src/b":         nil,
 				"foo/src/c":         nil,
@@ -799,7 +851,7 @@
 			ctx.MockFileSystem(mockFS)
 
 			ctx.Register()
-			_, errs := ctx.ParseFileList(".", []string{"fg/Android.bp", "foo/Android.bp"})
+			_, errs := ctx.ParseFileList(".", []string{"fg/Android.bp", "foo/Android.bp", "ofp/Android.bp"})
 			FailIfErrored(t, errs)
 			_, errs = ctx.PrepareBuildActions(config)
 			FailIfErrored(t, errs)
@@ -871,6 +923,26 @@
 			rels: []string{"src/a"},
 		},
 		{
+			name: "output file provider",
+			bp: `
+			test {
+				name: "foo",
+				srcs: [":b"],
+			}`,
+			srcs: []string{buildDir + "/.intermediates/ofp/b/gen/b"},
+			rels: []string{"gen/b"},
+		},
+		{
+			name: "output file provider tagged",
+			bp: `
+			test {
+				name: "foo",
+				srcs: [":b{.tagged}"],
+			}`,
+			srcs: []string{buildDir + "/.intermediates/ofp/b/gen/c"},
+			rels: []string{"gen/c"},
+		},
+		{
 			name: "special characters glob",
 			bp: `
 			test {
@@ -882,12 +954,6 @@
 		},
 	}
 
-	buildDir, err := ioutil.TempDir("", "soong_paths_for_module_src_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(buildDir)
-
 	testPathForModuleSrc(t, buildDir, tests)
 }
 
@@ -924,6 +990,26 @@
 			rel: "src/a",
 		},
 		{
+			name: "output file provider",
+			bp: `
+			test {
+				name: "foo",
+				src: ":b",
+			}`,
+			src: buildDir + "/.intermediates/ofp/b/gen/b",
+			rel: "gen/b",
+		},
+		{
+			name: "output file provider tagged",
+			bp: `
+			test {
+				name: "foo",
+				src: ":b{.tagged}",
+			}`,
+			src: buildDir + "/.intermediates/ofp/b/gen/c",
+			rel: "gen/c",
+		},
+		{
 			name: "special characters glob",
 			bp: `
 			test {
@@ -935,22 +1021,10 @@
 		},
 	}
 
-	buildDir, err := ioutil.TempDir("", "soong_path_for_module_src_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(buildDir)
-
 	testPathForModuleSrc(t, buildDir, tests)
 }
 
 func TestPathsForModuleSrc_AllowMissingDependencies(t *testing.T) {
-	buildDir, err := ioutil.TempDir("", "soong_paths_for_module_src_allow_missing_dependencies_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(buildDir)
-
 	config := TestConfig(buildDir, nil)
 	config.TestProductVariables.Allow_missing_dependencies = proptools.BoolPtr(true)
 
diff --git a/android/prebuilt_etc.go b/android/prebuilt_etc.go
index b13ce2a..069e1f5 100644
--- a/android/prebuilt_etc.go
+++ b/android/prebuilt_etc.go
@@ -24,6 +24,7 @@
 	RegisterModuleType("prebuilt_usr_share", PrebuiltUserShareFactory)
 	RegisterModuleType("prebuilt_usr_share_host", PrebuiltUserShareHostFactory)
 	RegisterModuleType("prebuilt_font", PrebuiltFontFactory)
+	RegisterModuleType("prebuilt_firmware", PrebuiltFirmwareFactory)
 
 	PreDepsMutators(func(ctx RegisterMutatorsContext) {
 		ctx.BottomUp("prebuilt_etc", prebuiltEtcMutator).Parallel()
@@ -61,7 +62,9 @@
 	sourceFilePath Path
 	outputFilePath OutputPath
 	// The base install location, e.g. "etc" for prebuilt_etc, "usr/share" for prebuilt_usr_share.
-	installDirBase         string
+	installDirBase string
+	// The base install location when soc_specific property is set to true, e.g. "firmware" for prebuilt_firmware.
+	socInstallDirBase      string
 	installDirPath         OutputPath
 	additionalDependencies *Paths
 }
@@ -121,7 +124,14 @@
 		return
 	}
 	p.outputFilePath = PathForModuleOut(ctx, filename).OutputPath
-	p.installDirPath = PathForModuleInstall(ctx, p.installDirBase, String(p.properties.Sub_dir))
+
+	// If soc install dir was specified and SOC specific is set, set the installDirPath to the specified
+	// socInstallDirBase.
+	installBaseDir := p.installDirBase
+	if ctx.SocSpecific() && p.socInstallDirBase != "" {
+		installBaseDir = p.socInstallDirBase
+	}
+	p.installDirPath = PathForModuleInstall(ctx, installBaseDir, String(p.properties.Sub_dir))
 
 	// This ensures that outputFilePath has the correct name for others to
 	// use, as the source file may have a different name.
@@ -250,3 +260,14 @@
 	InitAndroidArchModule(module, DeviceSupported, MultilibFirst)
 	return module
 }
+
+// prebuilt_firmware installs a firmware file to <partition>/etc/firmware directory for system image.
+// If soc_specific property is set to true, the firmware file is installed to the vendor <partition>/firmware
+// directory for vendor image.
+func PrebuiltFirmwareFactory() Module {
+	module := &PrebuiltEtc{installDirBase: "etc/firmware", socInstallDirBase: "firmware"}
+	InitPrebuiltEtcModule(module)
+	// This module is device-only
+	InitAndroidArchModule(module, DeviceSupported, MultilibFirst)
+	return module
+}
diff --git a/android/prebuilt_etc_test.go b/android/prebuilt_etc_test.go
index a5c4480..0a2c7a4 100644
--- a/android/prebuilt_etc_test.go
+++ b/android/prebuilt_etc_test.go
@@ -15,22 +15,20 @@
 package android
 
 import (
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"reflect"
 	"testing"
 )
 
 func testPrebuiltEtc(t *testing.T, bp string) (*TestContext, Config) {
-	config, buildDir := setUp(t)
-	defer tearDown(buildDir)
+	config := TestArchConfig(buildDir, nil)
 	ctx := NewTestArchContext()
 	ctx.RegisterModuleType("prebuilt_etc", ModuleFactoryAdaptor(PrebuiltEtcFactory))
 	ctx.RegisterModuleType("prebuilt_etc_host", ModuleFactoryAdaptor(PrebuiltEtcHostFactory))
 	ctx.RegisterModuleType("prebuilt_usr_share", ModuleFactoryAdaptor(PrebuiltUserShareFactory))
 	ctx.RegisterModuleType("prebuilt_usr_share_host", ModuleFactoryAdaptor(PrebuiltUserShareHostFactory))
 	ctx.RegisterModuleType("prebuilt_font", ModuleFactoryAdaptor(PrebuiltFontFactory))
+	ctx.RegisterModuleType("prebuilt_firmware", ModuleFactoryAdaptor(PrebuiltFirmwareFactory))
 	ctx.PreDepsMutators(func(ctx RegisterMutatorsContext) {
 		ctx.BottomUp("prebuilt_etc", prebuiltEtcMutator).Parallel()
 	})
@@ -50,20 +48,6 @@
 	return ctx, config
 }
 
-func setUp(t *testing.T) (config Config, buildDir string) {
-	buildDir, err := ioutil.TempDir("", "soong_prebuilt_etc_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	config = TestArchConfig(buildDir, nil)
-	return
-}
-
-func tearDown(buildDir string) {
-	os.RemoveAll(buildDir)
-}
-
 func TestPrebuiltEtcVariants(t *testing.T) {
 	ctx, _ := testPrebuiltEtc(t, `
 		prebuilt_etc {
@@ -235,3 +219,39 @@
 		t.Errorf("expected %q, got %q", expected, p.installDirPath.RelPathString())
 	}
 }
+
+func TestPrebuiltFirmwareDirPath(t *testing.T) {
+	targetPath := "target/product/test_device"
+	tests := []struct {
+		description  string
+		config       string
+		expectedPath string
+	}{{
+		description: "prebuilt: system firmware",
+		config: `
+			prebuilt_firmware {
+				name: "foo.conf",
+				src: "foo.conf",
+			}`,
+		expectedPath: filepath.Join(targetPath, "system/etc/firmware"),
+	}, {
+		description: "prebuilt: vendor firmware",
+		config: `
+			prebuilt_firmware {
+				name: "foo.conf",
+				src: "foo.conf",
+				soc_specific: true,
+				sub_dir: "sub_dir",
+			}`,
+		expectedPath: filepath.Join(targetPath, "vendor/firmware/sub_dir"),
+	}}
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			ctx, _ := testPrebuiltEtc(t, tt.config)
+			p := ctx.ModuleForTests("foo.conf", "android_arm64_armv8-a_core").Module().(*PrebuiltEtc)
+			if p.installDirPath.RelPathString() != tt.expectedPath {
+				t.Errorf("expected %q, got %q", tt.expectedPath, p.installDirPath)
+			}
+		})
+	}
+}
diff --git a/android/prebuilt_test.go b/android/prebuilt_test.go
index e182641..0a18e2c 100644
--- a/android/prebuilt_test.go
+++ b/android/prebuilt_test.go
@@ -15,8 +15,7 @@
 package android
 
 import (
-	"io/ioutil"
-	"os"
+	"fmt"
 	"testing"
 
 	"github.com/google/blueprint"
@@ -126,12 +125,6 @@
 }
 
 func TestPrebuilts(t *testing.T) {
-	buildDir, err := ioutil.TempDir("", "soong_prebuilt_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(buildDir)
-
 	config := TestConfig(buildDir, nil)
 
 	for _, test := range prebuiltsTests {
@@ -250,8 +243,13 @@
 	return &p.prebuilt
 }
 
-func (p *prebuiltModule) Srcs() Paths {
-	return Paths{p.src}
+func (p *prebuiltModule) OutputFiles(tag string) (Paths, error) {
+	switch tag {
+	case "":
+		return Paths{p.src}, nil
+	default:
+		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
+	}
 }
 
 type sourceModule struct {
diff --git a/android/rule_builder.go b/android/rule_builder.go
index 4a3b022..8d7e74b 100644
--- a/android/rule_builder.go
+++ b/android/rule_builder.go
@@ -525,6 +525,15 @@
 	return c
 }
 
+// OutputDir adds the output directory to the command line. This is only available when used with RuleBuilder.Sbox,
+// and will be the temporary output directory managed by sbox, not the final one.
+func (c *RuleBuilderCommand) OutputDir() *RuleBuilderCommand {
+	if !c.sbox {
+		panic("OutputDir only valid with Sbox")
+	}
+	return c.Text("__SBOX_OUT_DIR__")
+}
+
 // DepFile adds the specified depfile path to the paths returned by RuleBuilder.DepFiles and adds it to the command
 // line, and causes RuleBuilder.Build file to set the depfile flag for ninja.  If multiple depfiles are added to
 // commands in a single RuleBuilder then RuleBuilder.Build will add an extra command to merge the depfiles together.
diff --git a/android/rule_builder_test.go b/android/rule_builder_test.go
index df0f256..cfbc2ab 100644
--- a/android/rule_builder_test.go
+++ b/android/rule_builder_test.go
@@ -16,8 +16,6 @@
 
 import (
 	"fmt"
-	"io/ioutil"
-	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -418,12 +416,6 @@
 }
 
 func TestRuleBuilder_Build(t *testing.T) {
-	buildDir, err := ioutil.TempDir("", "soong_test_rule_builder")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(buildDir)
-
 	bp := `
 		rule_builder_test {
 			name: "foo",
diff --git a/android/sh_binary.go b/android/sh_binary.go
index cf415c5..fb7446d 100644
--- a/android/sh_binary.go
+++ b/android/sh_binary.go
@@ -16,7 +16,6 @@
 
 import (
 	"fmt"
-	"io"
 	"strings"
 )
 
@@ -58,6 +57,10 @@
 	// the name of the test configuration (for example "AndroidTest.xml") that should be
 	// installed with the module.
 	Test_config *string `android:"arch_variant"`
+
+	// list of files or filegroup modules that provide data that should be installed alongside
+	// the test.
+	Data []string `android:"path,arch_variant"`
 }
 
 type ShBinary struct {
@@ -73,6 +76,8 @@
 	ShBinary
 
 	testProperties TestProperties
+
+	data Paths
 }
 
 func (s *ShBinary) DepsMutator(ctx BottomUpMutatorContext) {
@@ -122,30 +127,50 @@
 	})
 }
 
-func (s *ShBinary) AndroidMk() AndroidMkData {
-	return AndroidMkData{
+func (s *ShBinary) AndroidMkEntries() AndroidMkEntries {
+	return AndroidMkEntries{
 		Class:      "EXECUTABLES",
 		OutputFile: OptionalPathForPath(s.outputFilePath),
 		Include:    "$(BUILD_SYSTEM)/soong_cc_prebuilt.mk",
-		Extra: []AndroidMkExtraFunc{
-			func(w io.Writer, outputFile Path) {
-				fmt.Fprintln(w, "LOCAL_MODULE_RELATIVE_PATH :=", String(s.properties.Sub_dir))
-				fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX :=")
-				fmt.Fprintln(w, "LOCAL_MODULE_STEM :=", s.outputFilePath.Rel())
-			},
+		AddCustomEntries: func(name, prefix, moduleDir string, entries *AndroidMkEntries) {
+			s.customAndroidMkEntries(entries)
 		},
 	}
 }
 
-func (s *ShTest) AndroidMk() AndroidMkData {
-	data := s.ShBinary.AndroidMk()
-	data.Class = "NATIVE_TESTS"
-	data.Extra = append(data.Extra, func(w io.Writer, outputFile Path) {
-		fmt.Fprintln(w, "LOCAL_COMPATIBILITY_SUITE :=",
-			strings.Join(s.testProperties.Test_suites, " "))
-		fmt.Fprintln(w, "LOCAL_TEST_CONFIG :=", String(s.testProperties.Test_config))
-	})
-	return data
+func (s *ShBinary) customAndroidMkEntries(entries *AndroidMkEntries) {
+	entries.SetString("LOCAL_MODULE_RELATIVE_PATH", String(s.properties.Sub_dir))
+	entries.SetString("LOCAL_MODULE_SUFFIX", "")
+	entries.SetString("LOCAL_MODULE_STEM", s.outputFilePath.Rel())
+}
+
+func (s *ShTest) GenerateAndroidBuildActions(ctx ModuleContext) {
+	s.ShBinary.GenerateAndroidBuildActions(ctx)
+
+	s.data = PathsForModuleSrc(ctx, s.testProperties.Data)
+}
+
+func (s *ShTest) AndroidMkEntries() AndroidMkEntries {
+	return AndroidMkEntries{
+		Class:      "NATIVE_TESTS",
+		OutputFile: OptionalPathForPath(s.outputFilePath),
+		Include:    "$(BUILD_SYSTEM)/soong_cc_prebuilt.mk",
+		AddCustomEntries: func(name, prefix, moduleDir string, entries *AndroidMkEntries) {
+			s.customAndroidMkEntries(entries)
+
+			entries.AddStrings("LOCAL_COMPATIBILITY_SUITE", s.testProperties.Test_suites...)
+			entries.SetString("LOCAL_TEST_CONFIG", String(s.testProperties.Test_config))
+			for _, d := range s.data {
+				rel := d.Rel()
+				path := d.String()
+				if !strings.HasSuffix(path, rel) {
+					panic(fmt.Errorf("path %q does not end with %q", path, rel))
+				}
+				path = strings.TrimSuffix(path, rel)
+				entries.AddStrings("LOCAL_TEST_DATA", path+":"+rel)
+			}
+		},
+	}
 }
 
 func InitShBinaryModule(s *ShBinary) {
diff --git a/android/sh_binary_test.go b/android/sh_binary_test.go
new file mode 100644
index 0000000..c99e18c
--- /dev/null
+++ b/android/sh_binary_test.go
@@ -0,0 +1,50 @@
+package android
+
+import (
+	"reflect"
+	"testing"
+)
+
+func testShBinary(t *testing.T, bp string) (*TestContext, Config) {
+	config := TestArchConfig(buildDir, nil)
+
+	ctx := NewTestArchContext()
+	ctx.RegisterModuleType("sh_test", ModuleFactoryAdaptor(ShTestFactory))
+	ctx.Register()
+	mockFiles := map[string][]byte{
+		"Android.bp":         []byte(bp),
+		"test.sh":            nil,
+		"testdata/data1":     nil,
+		"testdata/sub/data2": nil,
+	}
+	ctx.MockFileSystem(mockFiles)
+	_, errs := ctx.ParseFileList(".", []string{"Android.bp"})
+	FailIfErrored(t, errs)
+	_, errs = ctx.PrepareBuildActions(config)
+	FailIfErrored(t, errs)
+
+	return ctx, config
+}
+
+func TestShTestTestData(t *testing.T) {
+	ctx, config := testShBinary(t, `
+		sh_test {
+			name: "foo",
+			src: "test.sh",
+			filename: "test.sh",
+			data: [
+				"testdata/data1",
+				"testdata/sub/data2",
+			],
+		}
+	`)
+
+	mod := ctx.ModuleForTests("foo", "android_arm64_armv8-a").Module().(*ShTest)
+
+	entries := AndroidMkEntriesForTest(t, config, "", mod)
+	expected := []string{":testdata/data1", ":testdata/sub/data2"}
+	actual := entries.EntryMap["LOCAL_TEST_DATA"]
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("Unexpected test data expected: %q, actual: %q", expected, actual)
+	}
+}
diff --git a/android/testing.go b/android/testing.go
index c0db75e..44bee4b 100644
--- a/android/testing.go
+++ b/android/testing.go
@@ -179,7 +179,7 @@
 
 func maybeBuildParamsFromDescription(provider testBuildProvider, desc string) TestingBuildParams {
 	for _, p := range provider.BuildParamsForTests() {
-		if p.Description == desc {
+		if strings.Contains(p.Description, desc) {
 			return newTestingBuildParams(provider, p)
 		}
 	}
diff --git a/android/util.go b/android/util.go
index f7a3437..3b8bc78 100644
--- a/android/util.go
+++ b/android/util.go
@@ -16,6 +16,7 @@
 
 import (
 	"fmt"
+	"reflect"
 	"regexp"
 	"runtime"
 	"sort"
@@ -77,10 +78,15 @@
 	return string(ret)
 }
 
-func sortedKeys(m map[string][]string) []string {
-	s := make([]string, 0, len(m))
-	for k := range m {
-		s = append(s, k)
+func SortedStringKeys(m interface{}) []string {
+	v := reflect.ValueOf(m)
+	if v.Kind() != reflect.Map {
+		panic(fmt.Sprintf("%#v is not a map", m))
+	}
+	keys := v.MapKeys()
+	s := make([]string, 0, len(keys))
+	for _, key := range keys {
+		s = append(s, key.String())
 	}
 	sort.Strings(s)
 	return s
diff --git a/android/variable.go b/android/variable.go
index d039a16..b4f31c6 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -402,12 +402,12 @@
 	}
 }
 
-func (a *ModuleBase) setVariableProperties(ctx BottomUpMutatorContext,
+func (m *ModuleBase) setVariableProperties(ctx BottomUpMutatorContext,
 	prefix string, productVariablePropertyValue reflect.Value, variableValue interface{}) {
 
 	printfIntoProperties(ctx, prefix, productVariablePropertyValue, variableValue)
 
-	err := proptools.AppendMatchingProperties(a.generalProperties,
+	err := proptools.AppendMatchingProperties(m.generalProperties,
 		productVariablePropertyValue.Addr().Interface(), nil)
 	if err != nil {
 		if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
diff --git a/android/visibility.go b/android/visibility.go
index c7ef1da..94af343 100644
--- a/android/visibility.go
+++ b/android/visibility.go
@@ -23,14 +23,21 @@
 
 // Enforces visibility rules between modules.
 //
-// Two stage process:
-// * First stage works bottom up to extract visibility information from the modules, parse it,
+// Multi stage process:
+// * First stage works bottom up, before defaults expansion, to check the syntax of the visibility
+//   rules that have been specified.
+//
+// * Second stage works bottom up to extract the package info for each package and store them in a
+//   map by package name. See package.go for functionality for this.
+//
+// * Third stage works bottom up to extract visibility information from the modules, parse it,
 //   create visibilityRule structures and store them in a map keyed by the module's
 //   qualifiedModuleName instance, i.e. //<pkg>:<name>. The map is stored in the context rather
 //   than a global variable for testing. Each test has its own Config so they do not share a map
-//   and so can be run in parallel.
+//   and so can be run in parallel. If a module has no visibility specified then it uses the
+//   default package visibility if specified.
 //
-// * Second stage works top down and iterates over all the deps for each module. If the dep is in
+// * Fourth stage works top down and iterates over all the deps for each module. If the dep is in
 //   the same package then it is automatically visible. Otherwise, for each dep it first extracts
 //   its visibilityRule from the config map. If one could not be found then it assumes that it is
 //   publicly visible. Otherwise, it calls the visibility rule to check that the module can see
@@ -48,19 +55,6 @@
 
 var visibilityRuleRegexp = regexp.MustCompile(visibilityRulePattern)
 
-// Qualified id for a module
-type qualifiedModuleName struct {
-	// The package (i.e. directory) in which the module is defined, without trailing /
-	pkg string
-
-	// The name of the module.
-	name string
-}
-
-func (q qualifiedModuleName) String() string {
-	return fmt.Sprintf("//%s:%s", q.pkg, q.name)
-}
-
 // A visibility rule is associated with a module and determines which other modules it is visible
 // to, i.e. which other modules can depend on the rule's module.
 type visibilityRule interface {
@@ -71,6 +65,32 @@
 	String() string
 }
 
+// Describes the properties provided by a module that contain visibility rules.
+type visibilityPropertyImpl struct {
+	name          string
+	stringsGetter func() []string
+}
+
+type visibilityProperty interface {
+	getName() string
+	getStrings() []string
+}
+
+func newVisibilityProperty(name string, stringsGetter func() []string) visibilityProperty {
+	return visibilityPropertyImpl{
+		name:          name,
+		stringsGetter: stringsGetter,
+	}
+}
+
+func (p visibilityPropertyImpl) getName() string {
+	return p.name
+}
+
+func (p visibilityPropertyImpl) getStrings() []string {
+	return p.stringsGetter()
+}
+
 // A compositeRule is a visibility rule composed from a list of atomic visibility rules.
 //
 // The list corresponds to the list of strings in the visibility property after defaults expansion.
@@ -96,9 +116,9 @@
 	return false
 }
 
-func (r compositeRule) String() string {
-	s := make([]string, 0, len(r))
-	for _, r := range r {
+func (c compositeRule) String() string {
+	s := make([]string, 0, len(c))
+	for _, r := range c {
 		s = append(s, r.String())
 	}
 
@@ -173,9 +193,12 @@
 	ctx.BottomUp("visibilityRuleChecker", visibilityRuleChecker).Parallel()
 }
 
+// Registers the function that gathers the visibility rules for each module.
+//
 // Visibility is not dependent on arch so this must be registered before the arch phase to avoid
 // having to process multiple variants for each module. This goes after defaults expansion to gather
-// the complete visibility lists from flat lists.
+// the complete visibility lists from flat lists and after the package info is gathered to ensure
+// that default_visibility is available.
 func registerVisibilityRuleGatherer(ctx RegisterMutatorsContext) {
 	ctx.BottomUp("visibilityRuleGatherer", visibilityRuleGatherer).Parallel()
 }
@@ -193,33 +216,36 @@
 		for _, props := range d.properties() {
 			if cp, ok := props.(*commonProperties); ok {
 				if visibility := cp.Visibility; visibility != nil {
-					checkRules(ctx, qualified.pkg, visibility)
+					checkRules(ctx, qualified.pkg, "visibility", visibility)
 				}
 			}
 		}
 	} else if m, ok := ctx.Module().(Module); ok {
-		if visibility := m.base().commonProperties.Visibility; visibility != nil {
-			checkRules(ctx, qualified.pkg, visibility)
+		visibilityProperties := m.visibilityProperties()
+		for _, p := range visibilityProperties {
+			if visibility := p.getStrings(); visibility != nil {
+				checkRules(ctx, qualified.pkg, p.getName(), visibility)
+			}
 		}
 	}
 }
 
-func checkRules(ctx BottomUpMutatorContext, currentPkg string, visibility []string) {
+func checkRules(ctx BaseModuleContext, currentPkg, property string, visibility []string) {
 	ruleCount := len(visibility)
 	if ruleCount == 0 {
 		// This prohibits an empty list as its meaning is unclear, e.g. it could mean no visibility and
 		// it could mean public visibility. Requiring at least one rule makes the owner's intent
 		// clearer.
-		ctx.PropertyErrorf("visibility", "must contain at least one visibility rule")
+		ctx.PropertyErrorf(property, "must contain at least one visibility rule")
 		return
 	}
 
 	for _, v := range visibility {
-		ok, pkg, name := splitRule(ctx, v, currentPkg)
+		ok, pkg, name := splitRule(v, currentPkg)
 		if !ok {
 			// Visibility rule is invalid so ignore it. Keep going rather than aborting straight away to
 			// ensure all the rules on this module are checked.
-			ctx.PropertyErrorf("visibility",
+			ctx.PropertyErrorf(property,
 				"invalid visibility pattern %q must match"+
 					" //<package>:<module>, //<package> or :<module>",
 				v)
@@ -230,14 +256,14 @@
 			switch name {
 			case "private", "public":
 			case "legacy_public":
-				ctx.PropertyErrorf("visibility", "//visibility:legacy_public must not be used")
+				ctx.PropertyErrorf(property, "//visibility:legacy_public must not be used")
 				continue
 			default:
-				ctx.PropertyErrorf("visibility", "unrecognized visibility rule %q", v)
+				ctx.PropertyErrorf(property, "unrecognized visibility rule %q", v)
 				continue
 			}
 			if ruleCount != 1 {
-				ctx.PropertyErrorf("visibility", "cannot mix %q with any other visibility rules", v)
+				ctx.PropertyErrorf(property, "cannot mix %q with any other visibility rules", v)
 				continue
 			}
 		}
@@ -246,7 +272,7 @@
 		// restrictions on the rules.
 		if !isAncestor("vendor", currentPkg) {
 			if !isAllowedFromOutsideVendor(pkg, name) {
-				ctx.PropertyErrorf("visibility",
+				ctx.PropertyErrorf(property,
 					"%q is not allowed. Packages outside //vendor cannot make themselves visible to specific"+
 						" targets within //vendor, they can only use //vendor:__subpackages__.", v)
 				continue
@@ -265,23 +291,27 @@
 		return
 	}
 
-	qualified := createQualifiedModuleName(ctx)
+	qualifiedModuleId := m.qualifiedModuleId(ctx)
+	currentPkg := qualifiedModuleId.pkg
 
-	visibility := m.base().commonProperties.Visibility
-	if visibility != nil {
-		rule := parseRules(ctx, qualified.pkg, visibility)
-		if rule != nil {
-			moduleToVisibilityRuleMap(ctx).Store(qualified, rule)
+	// Parse all the properties into rules and store them.
+	visibilityProperties := m.visibilityProperties()
+	for _, p := range visibilityProperties {
+		if visibility := p.getStrings(); visibility != nil {
+			rule := parseRules(ctx, currentPkg, visibility)
+			if rule != nil {
+				moduleToVisibilityRuleMap(ctx).Store(qualifiedModuleId, rule)
+			}
 		}
 	}
 }
 
-func parseRules(ctx BottomUpMutatorContext, currentPkg string, visibility []string) compositeRule {
+func parseRules(ctx BaseModuleContext, currentPkg string, visibility []string) compositeRule {
 	rules := make(compositeRule, 0, len(visibility))
 	hasPrivateRule := false
 	hasNonPrivateRule := false
 	for _, v := range visibility {
-		ok, pkg, name := splitRule(ctx, v, currentPkg)
+		ok, pkg, name := splitRule(v, currentPkg)
 		if !ok {
 			continue
 		}
@@ -336,7 +366,7 @@
 	return !isAncestor("vendor", pkg)
 }
 
-func splitRule(ctx BaseModuleContext, ruleExpression string, currentPkg string) (bool, string, string) {
+func splitRule(ruleExpression string, currentPkg string) (bool, string, string) {
 	// Make sure that the rule is of the correct format.
 	matches := visibilityRuleRegexp.FindStringSubmatch(ruleExpression)
 	if ruleExpression == "" || matches == nil {
@@ -378,11 +408,15 @@
 			return
 		}
 
-		rule, ok := moduleToVisibilityRule.Load(depQualified)
+		value, ok := moduleToVisibilityRule.Load(depQualified)
+		var rule compositeRule
 		if ok {
-			if !rule.(compositeRule).matches(qualified) {
-				ctx.ModuleErrorf("depends on %s which is not visible to this module", depQualified)
-			}
+			rule = value.(compositeRule)
+		} else {
+			rule = packageDefaultVisibility(ctx, depQualified)
+		}
+		if rule != nil && !rule.matches(qualified) {
+			ctx.ModuleErrorf("depends on %s which is not visible to this module", depQualified)
 		}
 	})
 }
@@ -393,3 +427,20 @@
 	qualified := qualifiedModuleName{dir, moduleName}
 	return qualified
 }
+
+func packageDefaultVisibility(ctx BaseModuleContext, moduleId qualifiedModuleName) compositeRule {
+	moduleToVisibilityRule := moduleToVisibilityRuleMap(ctx)
+	packageQualifiedId := moduleId.getContainingPackageId()
+	for {
+		value, ok := moduleToVisibilityRule.Load(packageQualifiedId)
+		if ok {
+			return value.(compositeRule)
+		}
+
+		if packageQualifiedId.isRootPackage() {
+			return nil
+		}
+
+		packageQualifiedId = packageQualifiedId.getContainingPackageId()
+	}
+}
diff --git a/android/visibility_test.go b/android/visibility_test.go
index 09c5b1b..af6acf4 100644
--- a/android/visibility_test.go
+++ b/android/visibility_test.go
@@ -1,8 +1,6 @@
 package android
 
 import (
-	"io/ioutil"
-	"os"
 	"testing"
 
 	"github.com/google/blueprint"
@@ -660,15 +658,170 @@
 				` visible to this module`,
 		},
 	},
+	// Package default_visibility tests
+	{
+		name: "package default_visibility property is checked",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					default_visibility: ["//visibility:invalid"],
+				}`),
+		},
+		expectedErrors: []string{`default_visibility: unrecognized visibility rule "//visibility:invalid"`},
+	},
+	{
+		// This test relies on the default visibility being legacy_public.
+		name: "package default_visibility property used when no visibility specified",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					default_visibility: ["//visibility:private"],
+				}
+
+				mock_library {
+					name: "libexample",
+				}`),
+			"outsider/Blueprints": []byte(`
+				mock_library {
+					name: "liboutsider",
+					deps: ["libexample"],
+				}`),
+		},
+		expectedErrors: []string{
+			`module "liboutsider" variant "android_common": depends on //top:libexample which is not` +
+				` visible to this module`,
+		},
+	},
+	{
+		name: "package default_visibility public does not override visibility private",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					default_visibility: ["//visibility:public"],
+				}
+
+				mock_library {
+					name: "libexample",
+					visibility: ["//visibility:private"],
+				}`),
+			"outsider/Blueprints": []byte(`
+				mock_library {
+					name: "liboutsider",
+					deps: ["libexample"],
+				}`),
+		},
+		expectedErrors: []string{
+			`module "liboutsider" variant "android_common": depends on //top:libexample which is not` +
+				` visible to this module`,
+		},
+	},
+	{
+		name: "package default_visibility private does not override visibility public",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					default_visibility: ["//visibility:private"],
+				}
+
+				mock_library {
+					name: "libexample",
+					visibility: ["//visibility:public"],
+				}`),
+			"outsider/Blueprints": []byte(`
+				mock_library {
+					name: "liboutsider",
+					deps: ["libexample"],
+				}`),
+		},
+	},
+	{
+		name: "package default_visibility :__subpackages__",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					default_visibility: [":__subpackages__"],
+				}
+
+				mock_library {
+					name: "libexample",
+				}`),
+			"top/nested/Blueprints": []byte(`
+				mock_library {
+					name: "libnested",
+					deps: ["libexample"],
+				}`),
+			"outsider/Blueprints": []byte(`
+				mock_library {
+					name: "liboutsider",
+					deps: ["libexample"],
+				}`),
+		},
+		expectedErrors: []string{
+			`module "liboutsider" variant "android_common": depends on //top:libexample which is not` +
+				` visible to this module`,
+		},
+	},
+	{
+		name: "package default_visibility inherited to subpackages",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					default_visibility: ["//outsider"],
+				}
+
+				mock_library {
+					name: "libexample",
+          visibility: [":__subpackages__"],
+				}`),
+			"top/nested/Blueprints": []byte(`
+				mock_library {
+					name: "libnested",
+					deps: ["libexample"],
+				}`),
+			"outsider/Blueprints": []byte(`
+				mock_library {
+					name: "liboutsider",
+					deps: ["libexample", "libnested"],
+				}`),
+		},
+		expectedErrors: []string{
+			`module "liboutsider" variant "android_common": depends on //top:libexample which is not` +
+				` visible to this module`,
+		},
+	},
+	{
+		name: "package default_visibility inherited to subpackages",
+		fs: map[string][]byte{
+			"top/Blueprints": []byte(`
+				package {
+					default_visibility: ["//visibility:private"],
+				}`),
+			"top/nested/Blueprints": []byte(`
+				package {
+					default_visibility: ["//outsider"],
+				}
+
+				mock_library {
+					name: "libnested",
+				}`),
+			"top/other/Blueprints": []byte(`
+				mock_library {
+					name: "libother",
+				}`),
+			"outsider/Blueprints": []byte(`
+				mock_library {
+					name: "liboutsider",
+					deps: ["libother", "libnested"],
+				}`),
+		},
+		expectedErrors: []string{
+			`module "liboutsider" variant "android_common": depends on //top/other:libother which is` +
+				` not visible to this module`,
+		},
+	},
 }
 
 func TestVisibility(t *testing.T) {
-	buildDir, err := ioutil.TempDir("", "soong_neverallow_test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(buildDir)
-
 	for _, test := range visibilityTests {
 		t.Run(test.name, func(t *testing.T) {
 			_, errs := testVisibility(buildDir, test.fs)
@@ -700,8 +853,10 @@
 	config := TestArchConfig(buildDir, nil)
 
 	ctx := NewTestArchContext()
+	ctx.RegisterModuleType("package", ModuleFactoryAdaptor(PackageFactory))
 	ctx.RegisterModuleType("mock_library", ModuleFactoryAdaptor(newMockLibraryModule))
 	ctx.RegisterModuleType("mock_defaults", ModuleFactoryAdaptor(defaultsFactory))
+	ctx.PreArchMutators(registerPackageRenamer)
 	ctx.PreArchMutators(registerVisibilityRuleChecker)
 	ctx.PreArchMutators(RegisterDefaultsPreArchMutators)
 	ctx.PreArchMutators(registerVisibilityRuleGatherer)
@@ -759,6 +914,3 @@
 	InitDefaultsModule(m)
 	return m
 }
-
-func (*mockDefaults) GenerateAndroidBuildActions(ctx ModuleContext) {
-}
diff --git a/android/vts_config_test.go b/android/vts_config_test.go
index 7d4c9b1..142b2f5 100644
--- a/android/vts_config_test.go
+++ b/android/vts_config_test.go
@@ -15,19 +15,11 @@
 package android
 
 import (
-	"io/ioutil"
-	"os"
 	"testing"
 )
 
 func testVtsConfig(test *testing.T, bpFileContents string) *TestContext {
-	buildDir, err := ioutil.TempDir("", "soong_vts_config_test")
-	if err != nil {
-		test.Fatal(err)
-	}
-
 	config := TestArchConfig(buildDir, nil)
-	defer func() { os.RemoveAll(buildDir) }()
 
 	ctx := NewTestArchContext()
 	ctx.RegisterModuleType("vts_config", ModuleFactoryAdaptor(VtsConfigFactory))
diff --git a/androidmk/Android.bp b/androidmk/Android.bp
index 1d939b0..79fe530 100644
--- a/androidmk/Android.bp
+++ b/androidmk/Android.bp
@@ -30,6 +30,7 @@
         "androidmk-parser",
         "blueprint-parser",
         "bpfix-lib",
+        "soong-android",
     ],
 }
 
diff --git a/androidmk/cmd/androidmk/android.go b/androidmk/cmd/androidmk/android.go
index 24057af..af81e43 100644
--- a/androidmk/cmd/androidmk/android.go
+++ b/androidmk/cmd/androidmk/android.go
@@ -15,9 +15,9 @@
 package main
 
 import (
+	"android/soong/android"
 	mkparser "android/soong/androidmk/parser"
 	"fmt"
-	"sort"
 	"strings"
 
 	bpparser "github.com/google/blueprint/parser"
@@ -185,7 +185,6 @@
 			"LOCAL_NO_CRT":                     "nocrt",
 			"LOCAL_ALLOW_UNDEFINED_SYMBOLS":    "allow_undefined_symbols",
 			"LOCAL_RTTI_FLAG":                  "rtti",
-			"LOCAL_NO_STANDARD_LIBRARIES":      "no_standard_libs",
 			"LOCAL_PACK_MODULE_RELOCATIONS":    "pack_relocations",
 			"LOCAL_TIDY":                       "tidy",
 			"LOCAL_USE_CLANG_LLD":              "use_clang_lld",
@@ -335,15 +334,6 @@
 	}
 }
 
-func sortedMapKeys(inputMap map[string]string) (sortedKeys []string) {
-	keys := make([]string, 0, len(inputMap))
-	for key := range inputMap {
-		keys = append(keys, key)
-	}
-	sort.Strings(keys)
-	return keys
-}
-
 // splitAndAssign splits a Make list into components and then
 // creates the corresponding variable assignments.
 func splitAndAssign(ctx variableAssignmentContext, splitFunc listSplitFunc, namesByClassification map[string]string) error {
@@ -357,7 +347,7 @@
 		return err
 	}
 
-	for _, nameClassification := range sortedMapKeys(namesByClassification) {
+	for _, nameClassification := range android.SortedStringKeys(namesByClassification) {
 		name := namesByClassification[nameClassification]
 		if component, ok := lists[nameClassification]; ok && !emptyList(component) {
 			err = setVariable(ctx.file, ctx.append, ctx.prefix, name, component, true)
diff --git a/androidmk/cmd/androidmk/androidmk_test.go b/androidmk/cmd/androidmk/androidmk_test.go
index 2eab0cc..4d5180e 100644
--- a/androidmk/cmd/androidmk/androidmk_test.go
+++ b/androidmk/cmd/androidmk/androidmk_test.go
@@ -1179,6 +1179,84 @@
 `,
 	},
 	{
+		desc: "prebuilt_firmware subdir_bar in $(TARGET_OUT_ETC)",
+		in: `
+include $(CLEAR_VARS)
+LOCAL_MODULE := foo
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/firmware/bar
+LOCAL_SRC_FILES := foo.fw
+include $(BUILD_PREBUILT)
+`,
+		expected: `
+prebuilt_firmware {
+	name: "foo",
+
+	src: "foo.fw",
+	sub_dir: "bar",
+}
+`,
+	},
+	{
+		desc: "prebuilt_firmware subdir_bar in $(TARGET_OUT)",
+		in: `
+include $(CLEAR_VARS)
+LOCAL_MODULE := foo
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_PATH := $(TARGET_OUT)/etc/firmware/bar
+LOCAL_SRC_FILES := foo.fw
+include $(BUILD_PREBUILT)
+`,
+		expected: `
+prebuilt_firmware {
+	name: "foo",
+
+	src: "foo.fw",
+	sub_dir: "bar",
+}
+`,
+	},
+	{
+		desc: "prebuilt_firmware subdir_bar in $(TARGET_OUT_VENDOR)",
+		in: `
+include $(CLEAR_VARS)
+LOCAL_MODULE := foo
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_PATH := $(TARGET_OUT_VENDOR)/firmware/bar
+LOCAL_SRC_FILES := foo.fw
+include $(BUILD_PREBUILT)
+`,
+		expected: `
+prebuilt_firmware {
+	name: "foo",
+
+	src: "foo.fw",
+	sub_dir: "bar",
+	proprietary: true,
+}
+`,
+	},
+	{
+		desc: "prebuilt_firmware subdir_bar in $(TARGET_OUT)/vendor",
+		in: `
+include $(CLEAR_VARS)
+LOCAL_MODULE := foo
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MODULE_PATH := $(TARGET_OUT)/vendor/firmware/bar
+LOCAL_SRC_FILES := foo.fw
+include $(BUILD_PREBUILT)
+`,
+		expected: `
+prebuilt_firmware {
+	name: "foo",
+
+	src: "foo.fw",
+	sub_dir: "bar",
+	proprietary: true,
+}
+`,
+	},
+	{
 		desc: "vts_config",
 		in: `
 include $(CLEAR_VARS)
diff --git a/apex/apex.go b/apex/apex.go
index 51d0718..a77e295 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -61,7 +61,7 @@
 			`--key ${key} ${opt_flags} ${image_dir} ${out} `,
 		CommandDeps: []string{"${apexer}", "${avbtool}", "${e2fsdroid}", "${merge_zips}",
 			"${mke2fs}", "${resize2fs}", "${sefcontext_compile}",
-			"${soong_zip}", "${zipalign}", "${aapt2}"},
+			"${soong_zip}", "${zipalign}", "${aapt2}", "prebuilts/sdk/current/public/android.jar"},
 		Description: "APEX ${image_dir} => ${out}",
 	}, "tool_path", "image_dir", "copy_commands", "manifest", "file_contexts", "canned_fs_config", "key", "opt_flags")
 
@@ -90,12 +90,6 @@
 		CommandDeps: []string{"${zip2zip}"},
 		Description: "app bundle",
 	}, "abi")
-
-	apexMergeNoticeRule = pctx.StaticRule("apexMergeNoticeRule", blueprint.RuleParams{
-		Command:     `${mergenotice} --output $out $inputs`,
-		CommandDeps: []string{"${mergenotice}"},
-		Description: "merge notice files into $out",
-	}, "inputs")
 )
 
 var imageApexSuffix = ".apex"
@@ -144,8 +138,6 @@
 	pctx.HostBinToolVariable("zip2zip", "zip2zip")
 	pctx.HostBinToolVariable("zipalign", "zipalign")
 
-	pctx.SourcePathVariable("mergenotice", "build/soong/scripts/mergenotice.py")
-
 	android.RegisterModuleType("apex", apexBundleFactory)
 	android.RegisterModuleType("apex_test", testApexBundleFactory)
 	android.RegisterModuleType("apex_defaults", defaultsFactory)
@@ -153,7 +145,7 @@
 
 	android.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.TopDown("apex_deps", apexDepsMutator)
-		ctx.BottomUp("apex", apexMutator)
+		ctx.BottomUp("apex", apexMutator).Parallel()
 	})
 }
 
@@ -402,8 +394,6 @@
 	container_certificate_file android.Path
 	container_private_key_file android.Path
 
-	mergedNoticeFile android.WritablePath
-
 	// list of files to be included in this apex
 	filesInfo []apexFile
 
@@ -552,7 +542,7 @@
 	}
 }
 
-func (a *apexBundle) getCertString(ctx android.BaseContext) string {
+func (a *apexBundle) getCertString(ctx android.BaseModuleContext) string {
 	certificate, overridden := ctx.DeviceConfig().OverrideCertificateFor(ctx.ModuleName())
 	if overridden {
 		return ":" + certificate
@@ -560,11 +550,16 @@
 	return String(a.properties.Certificate)
 }
 
-func (a *apexBundle) Srcs() android.Paths {
-	if file, ok := a.outputFiles[imageApex]; ok {
-		return android.Paths{file}
-	} else {
-		return nil
+func (a *apexBundle) OutputFiles(tag string) (android.Paths, error) {
+	switch tag {
+	case "":
+		if file, ok := a.outputFiles[imageApex]; ok {
+			return android.Paths{file}, nil
+		} else {
+			return nil, nil
+		}
+	default:
+		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
 	}
 }
 
@@ -831,8 +826,6 @@
 	a.installDir = android.PathForModuleInstall(ctx, "apex")
 	a.filesInfo = filesInfo
 
-	a.buildNoticeFile(ctx)
-
 	if a.apexTypes.zip() {
 		a.buildUnflattenedApex(ctx, zipApex)
 	}
@@ -846,35 +839,27 @@
 	}
 }
 
-func (a *apexBundle) buildNoticeFile(ctx android.ModuleContext) {
+func (a *apexBundle) buildNoticeFile(ctx android.ModuleContext, apexFileName string) android.OptionalPath {
 	noticeFiles := []android.Path{}
-	noticeFilesString := []string{}
 	for _, f := range a.filesInfo {
 		if f.module != nil {
 			notice := f.module.NoticeFile()
 			if notice.Valid() {
 				noticeFiles = append(noticeFiles, notice.Path())
-				noticeFilesString = append(noticeFilesString, notice.Path().String())
 			}
 		}
 	}
 	// append the notice file specified in the apex module itself
 	if a.NoticeFile().Valid() {
 		noticeFiles = append(noticeFiles, a.NoticeFile().Path())
-		noticeFilesString = append(noticeFilesString, a.NoticeFile().Path().String())
 	}
 
-	if len(noticeFiles) > 0 {
-		a.mergedNoticeFile = android.PathForModuleOut(ctx, "NOTICE")
-		ctx.Build(pctx, android.BuildParams{
-			Rule:   apexMergeNoticeRule,
-			Inputs: noticeFiles,
-			Output: a.mergedNoticeFile,
-			Args: map[string]string{
-				"inputs": strings.Join(noticeFilesString, " "),
-			},
-		})
+	if len(noticeFiles) == 0 {
+		return android.OptionalPath{}
 	}
+
+	return android.OptionalPathForPath(
+		android.BuildNoticeOutput(ctx, a.installDir, apexFileName, android.FirstUniquePaths(noticeFiles)))
 }
 
 func (a *apexBundle) buildUnflattenedApex(ctx android.ModuleContext, apexType apexPackaging) {
@@ -999,6 +984,13 @@
 		}
 		optFlags = append(optFlags, "--target_sdk_version "+targetSdkVersion)
 
+		noticeFile := a.buildNoticeFile(ctx, ctx.ModuleName()+suffix)
+		if noticeFile.Valid() {
+			// If there's a NOTICE file, embed it as an asset file in the APEX.
+			implicitInputs = append(implicitInputs, noticeFile.Path())
+			optFlags = append(optFlags, "--assets_dir "+filepath.Dir(noticeFile.String()))
+		}
+
 		ctx.Build(pctx, android.BuildParams{
 			Rule:        apexRule,
 			Implicits:   implicitInputs,
@@ -1057,6 +1049,10 @@
 		Description: "signapk",
 		Output:      a.outputFiles[apexType],
 		Input:       unsignedOutputFile,
+		Implicits: []android.Path{
+			a.container_certificate_file,
+			a.container_private_key_file,
+		},
 		Args: map[string]string{
 			"certificates": a.container_certificate_file.String() + " " + a.container_private_key_file.String(),
 			"flags":        "-a 4096", //alignment
@@ -1241,9 +1237,6 @@
 				fmt.Fprintln(w, "LOCAL_MODULE_PATH :=", filepath.Join("$(OUT_DIR)", a.installDir.RelPathString()))
 				fmt.Fprintln(w, "LOCAL_MODULE_STEM :=", name+apexType.suffix())
 				fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE :=", !a.installable())
-				if a.installable() && a.mergedNoticeFile != nil {
-					fmt.Fprintln(w, "LOCAL_NOTICE_FILE :=", a.mergedNoticeFile.String())
-				}
 				if len(moduleNames) > 0 {
 					fmt.Fprintln(w, "LOCAL_REQUIRED_MODULES +=", strings.Join(moduleNames, " "))
 				}
@@ -1290,9 +1283,6 @@
 	android.DefaultsModuleBase
 }
 
-func (*Defaults) GenerateAndroidBuildActions(ctx android.ModuleContext) {
-}
-
 func defaultsFactory() android.Module {
 	return DefaultsFactory()
 }
@@ -1383,8 +1373,13 @@
 	p.properties.Source = src
 }
 
-func (p *Prebuilt) Srcs() android.Paths {
-	return android.Paths{p.outputApex}
+func (p *Prebuilt) OutputFiles(tag string) (android.Paths, error) {
+	switch tag {
+	case "":
+		return android.Paths{p.outputApex}, nil
+	default:
+		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
+	}
 }
 
 func (p *Prebuilt) InstallFilename() string {
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 5276ce4..2e44db7 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -27,9 +27,15 @@
 	"android/soong/java"
 )
 
+var buildDir string
+
 func testApex(t *testing.T, bp string) *android.TestContext {
-	config, buildDir := setup(t)
-	defer teardown(buildDir)
+	config := android.TestArchConfig(buildDir, nil)
+	config.TestProductVariables.DeviceVndkVersion = proptools.StringPtr("current")
+	config.TestProductVariables.DefaultAppCertificate = proptools.StringPtr("vendor/foo/devkeys/test")
+	config.TestProductVariables.CertificateOverrides = []string{"myapex_keytest:myapex.certificate.override"}
+	config.TestProductVariables.Platform_sdk_codename = proptools.StringPtr("Q")
+	config.TestProductVariables.Platform_sdk_final = proptools.BoolPtr(false)
 
 	ctx := android.NewTestArchContext()
 	ctx.RegisterModuleType("apex", android.ModuleFactoryAdaptor(apexBundleFactory))
@@ -188,22 +194,15 @@
 	return ctx
 }
 
-func setup(t *testing.T) (config android.Config, buildDir string) {
-	buildDir, err := ioutil.TempDir("", "soong_apex_test")
+func setUp() {
+	var err error
+	buildDir, err = ioutil.TempDir("", "soong_apex_test")
 	if err != nil {
-		t.Fatal(err)
+		panic(err)
 	}
-
-	config = android.TestArchConfig(buildDir, nil)
-	config.TestProductVariables.DeviceVndkVersion = proptools.StringPtr("current")
-	config.TestProductVariables.DefaultAppCertificate = proptools.StringPtr("vendor/foo/devkeys/test")
-	config.TestProductVariables.CertificateOverrides = []string{"myapex_keytest:myapex.certificate.override"}
-	config.TestProductVariables.Platform_sdk_codename = proptools.StringPtr("Q")
-	config.TestProductVariables.Platform_sdk_final = proptools.BoolPtr(false)
-	return
 }
 
-func teardown(buildDir string) {
+func tearDown() {
 	os.RemoveAll(buildDir)
 }
 
@@ -310,6 +309,8 @@
 
 	optFlags := apexRule.Args["opt_flags"]
 	ensureContains(t, optFlags, "--pubkey vendor/foo/devkeys/testkey.avbpubkey")
+	// Ensure that the NOTICE output is being packaged as an asset.
+	ensureContains(t, optFlags, "--assets_dir "+buildDir+"/.intermediates/myapex/android_common_myapex/NOTICE")
 
 	copyCmds := apexRule.Args["copy_commands"]
 
@@ -347,10 +348,10 @@
 		t.Errorf("Could not find all expected symlinks! foo: %t, foo_link_64: %t. Command was %s", found_foo, found_foo_link_64, copyCmds)
 	}
 
-	apexMergeNoticeRule := ctx.ModuleForTests("myapex", "android_common_myapex").Rule("apexMergeNoticeRule")
-	noticeInputs := strings.Split(apexMergeNoticeRule.Args["inputs"], " ")
-	if len(noticeInputs) != 3 {
-		t.Errorf("number of input notice files: expected = 3, actual = %d", len(noticeInputs))
+	mergeNoticesRule := ctx.ModuleForTests("myapex", "android_common_myapex").Rule("mergeNoticesRule")
+	noticeInputs := mergeNoticesRule.Inputs.Strings()
+	if len(noticeInputs) != 2 {
+		t.Errorf("number of input notice files: expected = 2, actual = %q", len(noticeInputs))
 	}
 	ensureListContains(t, noticeInputs, "NOTICE")
 	ensureListContains(t, noticeInputs, "custom_notice")
@@ -585,7 +586,7 @@
 
 		cc_library {
 			name: "libc",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",
@@ -596,7 +597,7 @@
 
 		cc_library {
 			name: "libm",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",
@@ -607,7 +608,7 @@
 
 		cc_library {
 			name: "libdl",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",
@@ -1283,3 +1284,14 @@
 		t.Errorf("installFilename invalid. expected: %q, actual: %q", expected, p.installFilename)
 	}
 }
+
+func TestMain(m *testing.M) {
+	run := func() int {
+		setUp()
+		defer tearDown()
+
+		return m.Run()
+	}
+
+	os.Exit(run())
+}
diff --git a/bpf/bpf.go b/bpf/bpf.go
index dcbf9ad..90ec963 100644
--- a/bpf/bpf.go
+++ b/bpf/bpf.go
@@ -122,13 +122,18 @@
 	}
 }
 
-// Implements SourceFileProducer interface so that the obj output can be used in the data property
+// Implements OutputFileFileProducer interface so that the obj output can be used in the data property
 // of other modules.
-func (bpf *bpf) Srcs() android.Paths {
-	return bpf.objs
+func (bpf *bpf) OutputFiles(tag string) (android.Paths, error) {
+	switch tag {
+	case "":
+		return bpf.objs, nil
+	default:
+		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
+	}
 }
 
-var _ android.SourceFileProducer = (*bpf)(nil)
+var _ android.OutputFileProducer = (*bpf)(nil)
 
 func bpfFactory() android.Module {
 	module := &bpf{}
diff --git a/bpfix/bpfix/bpfix.go b/bpfix/bpfix/bpfix.go
index 17cff18..cac4d9a 100644
--- a/bpfix/bpfix/bpfix.go
+++ b/bpfix/bpfix/bpfix.go
@@ -503,16 +503,18 @@
 }
 
 var localModuleUpdate = map[string][]etcPrebuiltModuleUpdate{
-	"HOST_OUT":                        {{prefix: "/etc", modType: "prebuilt_etc_host"}, {prefix: "/usr/share", modType: "prebuilt_usr_share_host"}},
-	"PRODUCT_OUT":                     {{prefix: "/system/etc"}, {prefix: "/vendor/etc", flags: []string{"proprietary"}}},
-	"TARGET_OUT":                      {{prefix: "/etc"}, {prefix: "/usr/share", modType: "prebuilt_usr_share"}, {prefix: "/fonts", modType: "prebuilt_font"}},
-	"TARGET_OUT_ETC":                  {{prefix: ""}},
+	"HOST_OUT":    {{prefix: "/etc", modType: "prebuilt_etc_host"}, {prefix: "/usr/share", modType: "prebuilt_usr_share_host"}},
+	"PRODUCT_OUT": {{prefix: "/system/etc"}, {prefix: "/vendor/etc", flags: []string{"proprietary"}}},
+	"TARGET_OUT": {{prefix: "/usr/share", modType: "prebuilt_usr_share"}, {prefix: "/fonts", modType: "prebuilt_font"},
+		{prefix: "/etc/firmware", modType: "prebuilt_firmware"}, {prefix: "/vendor/firmware", modType: "prebuilt_firmware", flags: []string{"proprietary"}},
+		{prefix: "/etc"}},
+	"TARGET_OUT_ETC":                  {{prefix: "/firmware", modType: "prebuilt_firmware"}, {prefix: ""}},
 	"TARGET_OUT_PRODUCT":              {{prefix: "/etc", flags: []string{"product_specific"}}, {prefix: "/fonts", modType: "prebuilt_font", flags: []string{"product_specific"}}},
 	"TARGET_OUT_PRODUCT_ETC":          {{prefix: "", flags: []string{"product_specific"}}},
 	"TARGET_OUT_ODM":                  {{prefix: "/etc", flags: []string{"device_specific"}}},
 	"TARGET_OUT_PRODUCT_SERVICES":     {{prefix: "/etc", flags: []string{"product_services_specific"}}},
 	"TARGET_OUT_PRODUCT_SERVICES_ETC": {{prefix: "", flags: []string{"product_services_specific"}}},
-	"TARGET_OUT_VENDOR":               {{prefix: "/etc", flags: []string{"proprietary"}}},
+	"TARGET_OUT_VENDOR":               {{prefix: "/etc", flags: []string{"proprietary"}}, {prefix: "/firmware", modType: "prebuilt_firmware", flags: []string{"proprietary"}}},
 	"TARGET_OUT_VENDOR_ETC":           {{prefix: "", flags: []string{"proprietary"}}},
 	"TARGET_RECOVERY_ROOT_OUT":        {{prefix: "/system/etc", flags: []string{"recovery"}}},
 }
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 32ccf4c..272d3d4 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -156,12 +156,18 @@
 
 func (library *libraryDecorator) androidMkWriteExportedFlags(w io.Writer) {
 	exportedFlags := library.exportedFlags()
+	for _, dir := range library.exportedDirs() {
+		exportedFlags = append(exportedFlags, "-I"+dir)
+	}
+	for _, dir := range library.exportedSystemDirs() {
+		exportedFlags = append(exportedFlags, "-isystem "+dir)
+	}
 	if len(exportedFlags) > 0 {
 		fmt.Fprintln(w, "LOCAL_EXPORT_CFLAGS :=", strings.Join(exportedFlags, " "))
 	}
-	exportedFlagsDeps := library.exportedFlagsDeps()
-	if len(exportedFlagsDeps) > 0 {
-		fmt.Fprintln(w, "LOCAL_EXPORT_C_INCLUDE_DEPS :=", strings.Join(exportedFlagsDeps.Strings(), " "))
+	exportedDeps := library.exportedDeps()
+	if len(exportedDeps) > 0 {
+		fmt.Fprintln(w, "LOCAL_EXPORT_C_INCLUDE_DEPS :=", strings.Join(exportedDeps.Strings(), " "))
 	}
 }
 
diff --git a/cc/binary.go b/cc/binary.go
index 93d1de2..1757f1c 100644
--- a/cc/binary.go
+++ b/cc/binary.go
@@ -36,7 +36,7 @@
 	Prefix_symbols *string
 
 	// if set, install a symlink to the preferred architecture
-	Symlink_preferred_arch *bool
+	Symlink_preferred_arch *bool `android:"arch_variant"`
 
 	// install symlinks to the binary.  Symlink names will have the suffix and the binary
 	// extension (if any) appended
@@ -106,13 +106,17 @@
 
 }
 
-func (binary *binaryDecorator) getStem(ctx BaseModuleContext) string {
+func (binary *binaryDecorator) getStemWithoutSuffix(ctx BaseModuleContext) string {
 	stem := ctx.baseModuleName()
 	if String(binary.Properties.Stem) != "" {
 		stem = String(binary.Properties.Stem)
 	}
 
-	return stem + String(binary.Properties.Suffix)
+	return stem
+}
+
+func (binary *binaryDecorator) getStem(ctx BaseModuleContext) string {
+	return binary.getStemWithoutSuffix(ctx) + String(binary.Properties.Suffix)
 }
 
 func (binary *binaryDecorator) linkerDeps(ctx DepsContext, deps Deps) Deps {
@@ -326,7 +330,7 @@
 		}
 		strippedOutputFile := outputFile
 		outputFile = android.PathForModuleOut(ctx, "unstripped", fileName)
-		binary.stripper.strip(ctx, outputFile, strippedOutputFile, builderFlags)
+		binary.stripper.stripExecutableOrSharedLib(ctx, outputFile, strippedOutputFile, builderFlags)
 	}
 
 	binary.unstrippedOutputFile = outputFile
@@ -350,7 +354,7 @@
 			if binary.stripper.needsStrip(ctx) {
 				out := android.PathForModuleOut(ctx, "versioned-stripped", fileName)
 				binary.distFile = android.OptionalPathForPath(out)
-				binary.stripper.strip(ctx, versionedOutputFile, out, builderFlags)
+				binary.stripper.stripExecutableOrSharedLib(ctx, versionedOutputFile, out, builderFlags)
 			}
 
 			binary.injectVersionSymbol(ctx, outputFile, versionedOutputFile)
@@ -388,7 +392,7 @@
 
 	objs.coverageFiles = append(objs.coverageFiles, deps.StaticLibObjs.coverageFiles...)
 	objs.coverageFiles = append(objs.coverageFiles, deps.WholeStaticLibObjs.coverageFiles...)
-	binary.coverageOutputFile = TransformCoverageFilesToLib(ctx, objs, builderFlags, binary.getStem(ctx))
+	binary.coverageOutputFile = TransformCoverageFilesToZip(ctx, objs, binary.getStem(ctx))
 
 	// Need to determine symlinks early since some targets (ie APEX) need this
 	// information but will not call 'install'
@@ -398,11 +402,11 @@
 	}
 
 	if Bool(binary.Properties.Symlink_preferred_arch) {
-		if String(binary.Properties.Stem) == "" && String(binary.Properties.Suffix) == "" {
-			ctx.PropertyErrorf("symlink_preferred_arch", "must also specify stem or suffix")
+		if String(binary.Properties.Suffix) == "" {
+			ctx.PropertyErrorf("symlink_preferred_arch", "must also specify suffix")
 		}
 		if ctx.TargetPrimary() {
-			binary.symlinks = append(binary.symlinks, ctx.baseModuleName())
+			binary.symlinks = append(binary.symlinks, binary.getStemWithoutSuffix(ctx))
 		}
 	}
 
diff --git a/cc/builder.go b/cc/builder.go
index 7cf5c29..ee40736 100644
--- a/cc/builder.go
+++ b/cc/builder.go
@@ -22,7 +22,6 @@
 	"fmt"
 	"path/filepath"
 	"runtime"
-	"strconv"
 	"strings"
 
 	"github.com/google/blueprint"
@@ -93,20 +92,6 @@
 		},
 		"arCmd", "arFlags")
 
-	darwinAr = pctx.AndroidStaticRule("darwinAr",
-		blueprint.RuleParams{
-			Command:     "rm -f ${out} && ${config.MacArPath} $arFlags $out $in",
-			CommandDeps: []string{"${config.MacArPath}"},
-		},
-		"arFlags")
-
-	darwinAppendAr = pctx.AndroidStaticRule("darwinAppendAr",
-		blueprint.RuleParams{
-			Command:     "cp -f ${inAr} ${out}.tmp && ${config.MacArPath} $arFlags ${out}.tmp $in && mv ${out}.tmp ${out}",
-			CommandDeps: []string{"${config.MacArPath}", "${inAr}"},
-		},
-		"arFlags", "inAr")
-
 	darwinStrip = pctx.AndroidStaticRule("darwinStrip",
 		blueprint.RuleParams{
 			Command:     "${config.MacStripPath} -u -r -o $out $in",
@@ -228,6 +213,14 @@
 		blueprint.RuleParams{
 			Command: "gunzip -c $in > $out",
 		})
+
+	zip = pctx.AndroidStaticRule("zip",
+		blueprint.RuleParams{
+			Command:        "cat $out.rsp | tr ' ' '\\n' | tr -d \\' | sort -u > ${out}.tmp && ${SoongZipCmd} -o ${out} -C $$OUT_DIR -l ${out}.tmp",
+			CommandDeps:    []string{"${SoongZipCmd}"},
+			Rspfile:        "$out.rsp",
+			RspfileContent: "$in",
+		})
 )
 
 func init() {
@@ -240,6 +233,8 @@
 		// Darwin doesn't have /proc
 		pctx.StaticVariable("relPwd", "")
 	}
+
+	pctx.HostBinToolVariable("SoongZipCmd", "soong_zip")
 }
 
 type builderFlags struct {
@@ -421,7 +416,7 @@
 			ccCmd = "clang"
 			moduleCflags = cflags
 			moduleToolingCflags = toolingCflags
-		case ".cpp", ".cc", ".mm":
+		case ".cpp", ".cc", ".cxx", ".mm":
 			ccCmd = "clang++"
 			moduleCflags = cppflags
 			moduleToolingCflags = toolingCppflags
@@ -505,11 +500,6 @@
 func TransformObjToStaticLib(ctx android.ModuleContext, objFiles android.Paths,
 	flags builderFlags, outputFile android.ModuleOutPath, deps android.Paths) {
 
-	if ctx.Darwin() {
-		transformDarwinObjToStaticLib(ctx, objFiles, flags, outputFile, deps)
-		return
-	}
-
 	arCmd := "${config.ClangBin}/llvm-ar"
 	arFlags := "crsD"
 	if !ctx.Darwin() {
@@ -532,82 +522,6 @@
 	})
 }
 
-// Generate a rule for compiling multiple .o files to a static library (.a) on
-// darwin.  The darwin ar tool doesn't support @file for list files, and has a
-// very small command line length limit, so we have to split the ar into multiple
-// steps, each appending to the previous one.
-func transformDarwinObjToStaticLib(ctx android.ModuleContext, objFiles android.Paths,
-	flags builderFlags, outputFile android.ModuleOutPath, deps android.Paths) {
-
-	arFlags := "cqs"
-
-	if len(objFiles) == 0 {
-		dummy := android.PathForModuleOut(ctx, "dummy"+objectExtension)
-		dummyAr := android.PathForModuleOut(ctx, "dummy"+staticLibraryExtension)
-
-		ctx.Build(pctx, android.BuildParams{
-			Rule:        emptyFile,
-			Description: "empty object file",
-			Output:      dummy,
-			Implicits:   deps,
-		})
-
-		ctx.Build(pctx, android.BuildParams{
-			Rule:        darwinAr,
-			Description: "empty static archive",
-			Output:      dummyAr,
-			Input:       dummy,
-			Args: map[string]string{
-				"arFlags": arFlags,
-			},
-		})
-
-		ctx.Build(pctx, android.BuildParams{
-			Rule:        darwinAppendAr,
-			Description: "static link " + outputFile.Base(),
-			Output:      outputFile,
-			Input:       dummy,
-			Args: map[string]string{
-				"arFlags": "d",
-				"inAr":    dummyAr.String(),
-			},
-		})
-
-		return
-	}
-
-	// ARG_MAX on darwin is 262144, use half that to be safe
-	objFilesLists, err := splitListForSize(objFiles, 131072)
-	if err != nil {
-		ctx.ModuleErrorf("%s", err.Error())
-	}
-
-	var in, out android.WritablePath
-	for i, l := range objFilesLists {
-		in = out
-		out = outputFile
-		if i != len(objFilesLists)-1 {
-			out = android.PathForModuleOut(ctx, outputFile.Base()+strconv.Itoa(i))
-		}
-
-		build := android.BuildParams{
-			Rule:        darwinAr,
-			Description: "static link " + out.Base(),
-			Output:      out,
-			Inputs:      l,
-			Implicits:   deps,
-			Args: map[string]string{
-				"arFlags": arFlags,
-			},
-		}
-		if i != 0 {
-			build.Rule = darwinAppendAr
-			build.Args["inAr"] = in.String()
-		}
-		ctx.Build(pctx, build)
-	}
-}
-
 // Generate a rule for compiling multiple .o files, plus static libraries, whole static libraries,
 // and shared libraries, to a shared library (.so) or dynamic executable
 func TransformObjToDynamicBinary(ctx android.ModuleContext,
@@ -883,13 +797,18 @@
 	})
 }
 
-func TransformCoverageFilesToLib(ctx android.ModuleContext,
-	inputs Objects, flags builderFlags, baseName string) android.OptionalPath {
+func TransformCoverageFilesToZip(ctx android.ModuleContext,
+	inputs Objects, baseName string) android.OptionalPath {
 
 	if len(inputs.coverageFiles) > 0 {
-		outputFile := android.PathForModuleOut(ctx, baseName+".gcnodir")
+		outputFile := android.PathForModuleOut(ctx, baseName+".zip")
 
-		TransformObjToStaticLib(ctx, inputs.coverageFiles, flags, outputFile, nil)
+		ctx.Build(pctx, android.BuildParams{
+			Rule:        zip,
+			Description: "zip " + outputFile.Base(),
+			Inputs:      inputs.coverageFiles,
+			Output:      outputFile,
+		})
 
 		return android.OptionalPathForPath(outputFile)
 	}
diff --git a/cc/cc.go b/cc/cc.go
index 09496fc..6215067 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -19,6 +19,7 @@
 // is handled in builder.go
 
 import (
+	"fmt"
 	"io"
 	"strconv"
 	"strings"
@@ -64,7 +65,7 @@
 		ctx.TopDown("tsan_deps", sanitizerDepsMutator(tsan))
 		ctx.BottomUp("tsan", sanitizerMutator(tsan)).Parallel()
 
-		ctx.TopDown("sanitize_runtime_deps", sanitizerRuntimeDepsMutator)
+		ctx.TopDown("sanitize_runtime_deps", sanitizerRuntimeDepsMutator).Parallel()
 		ctx.BottomUp("sanitize_runtime", sanitizerRuntimeMutator).Parallel()
 
 		ctx.BottomUp("coverage", coverageMutator).Parallel()
@@ -118,8 +119,13 @@
 	GeneratedSources android.Paths
 	GeneratedHeaders android.Paths
 
-	Flags, ReexportedFlags []string
-	ReexportedFlagsDeps    android.Paths
+	Flags                []string
+	IncludeDirs          []string
+	SystemIncludeDirs    []string
+	ReexportedDirs       []string
+	ReexportedSystemDirs []string
+	ReexportedFlags      []string
+	ReexportedDeps       android.Paths
 
 	// Paths to crt*.o files
 	CrtBegin, CrtEnd android.OptionalPath
@@ -277,7 +283,7 @@
 }
 
 type BaseModuleContext interface {
-	android.BaseContext
+	android.BaseModuleContext
 	ModuleContextIntf
 }
 
@@ -640,7 +646,7 @@
 }
 
 type baseModuleContext struct {
-	android.BaseContext
+	android.BaseModuleContext
 	moduleContextImpl
 }
 
@@ -772,6 +778,10 @@
 		// APEX variants do not need ABI dumps.
 		return false
 	}
+	if ctx.isStubs() {
+		// Stubs do not need ABI dumps.
+		return false
+	}
 	if ctx.isNdk() {
 		return true
 	}
@@ -987,6 +997,14 @@
 	flags.ConlyFlags, _ = filterList(flags.ConlyFlags, config.IllegalFlags)
 
 	flags.GlobalFlags = append(flags.GlobalFlags, deps.Flags...)
+
+	for _, dir := range deps.IncludeDirs {
+		flags.GlobalFlags = append(flags.GlobalFlags, "-I"+dir)
+	}
+	for _, dir := range deps.SystemIncludeDirs {
+		flags.GlobalFlags = append(flags.GlobalFlags, "-isystem "+dir)
+	}
+
 	c.flags = flags
 	// We need access to all the flags seen by a source file.
 	if c.sabi != nil {
@@ -1039,7 +1057,7 @@
 	}
 }
 
-func (c *Module) toolchain(ctx android.BaseContext) config.Toolchain {
+func (c *Module) toolchain(ctx android.BaseModuleContext) config.Toolchain {
 	if c.cachedToolchain == nil {
 		c.cachedToolchain = config.FindToolchain(ctx.Os(), ctx.Arch())
 	}
@@ -1160,7 +1178,7 @@
 
 func (c *Module) beginMutator(actx android.BottomUpMutatorContext) {
 	ctx := &baseModuleContext{
-		BaseContext: actx,
+		BaseModuleContext: actx,
 		moduleContextImpl: moduleContextImpl{
 			mod: c,
 		},
@@ -1577,6 +1595,13 @@
 	llndkLibraries := llndkLibraries(ctx.Config())
 	vendorPublicLibraries := vendorPublicLibraries(ctx.Config())
 
+	reexportExporter := func(exporter exportedFlagsProducer) {
+		depPaths.ReexportedDirs = append(depPaths.ReexportedDirs, exporter.exportedDirs()...)
+		depPaths.ReexportedSystemDirs = append(depPaths.ReexportedSystemDirs, exporter.exportedSystemDirs()...)
+		depPaths.ReexportedFlags = append(depPaths.ReexportedFlags, exporter.exportedFlags()...)
+		depPaths.ReexportedDeps = append(depPaths.ReexportedDeps, exporter.exportedDeps()...)
+	}
+
 	ctx.VisitDirectDeps(func(dep android.Module) {
 		depName := ctx.OtherModuleName(dep)
 		depTag := ctx.OtherModuleDependencyTag(dep)
@@ -1598,14 +1623,13 @@
 				if genRule, ok := dep.(genrule.SourceFileGenerator); ok {
 					depPaths.GeneratedHeaders = append(depPaths.GeneratedHeaders,
 						genRule.GeneratedDeps()...)
-					flags := includeDirsToFlags(genRule.GeneratedHeaderDirs())
-					depPaths.Flags = append(depPaths.Flags, flags)
+					dirs := genRule.GeneratedHeaderDirs().Strings()
+					depPaths.IncludeDirs = append(depPaths.IncludeDirs, dirs...)
 					if depTag == genHeaderExportDepTag {
-						depPaths.ReexportedFlags = append(depPaths.ReexportedFlags, flags)
-						depPaths.ReexportedFlagsDeps = append(depPaths.ReexportedFlagsDeps,
-							genRule.GeneratedDeps()...)
+						depPaths.ReexportedDirs = append(depPaths.ReexportedDirs, dirs...)
+						depPaths.ReexportedDeps = append(depPaths.ReexportedDeps, genRule.GeneratedDeps()...)
 						// Add these re-exported flags to help header-abi-dumper to infer the abi exported by a library.
-						c.sabi.Properties.ReexportedIncludeFlags = append(c.sabi.Properties.ReexportedIncludeFlags, flags)
+						c.sabi.Properties.ReexportedIncludes = append(c.sabi.Properties.ReexportedIncludes, dirs...)
 
 					}
 				} else {
@@ -1643,10 +1667,9 @@
 		if depTag == reuseObjTag {
 			if l, ok := ccDep.compiler.(libraryInterface); ok {
 				c.staticVariant = ccDep
-				objs, flags, deps := l.reuseObjs()
+				objs, exporter := l.reuseObjs()
 				depPaths.Objs = depPaths.Objs.Append(objs)
-				depPaths.ReexportedFlags = append(depPaths.ReexportedFlags, flags...)
-				depPaths.ReexportedFlagsDeps = append(depPaths.ReexportedFlagsDeps, deps...)
+				reexportExporter(exporter)
 				return
 			}
 		}
@@ -1709,18 +1732,20 @@
 			}
 
 			if i, ok := ccDep.linker.(exportedFlagsProducer); ok {
-				flags := i.exportedFlags()
-				deps := i.exportedFlagsDeps()
-				depPaths.Flags = append(depPaths.Flags, flags...)
-				depPaths.GeneratedHeaders = append(depPaths.GeneratedHeaders, deps...)
+				depPaths.IncludeDirs = append(depPaths.IncludeDirs, i.exportedDirs()...)
+				depPaths.SystemIncludeDirs = append(depPaths.SystemIncludeDirs, i.exportedSystemDirs()...)
+				depPaths.GeneratedHeaders = append(depPaths.GeneratedHeaders, i.exportedDeps()...)
+				depPaths.Flags = append(depPaths.Flags, i.exportedFlags()...)
 
 				if t.reexportFlags {
-					depPaths.ReexportedFlags = append(depPaths.ReexportedFlags, flags...)
-					depPaths.ReexportedFlagsDeps = append(depPaths.ReexportedFlagsDeps, deps...)
+					reexportExporter(i)
 					// Add these re-exported flags to help header-abi-dumper to infer the abi exported by a library.
 					// Re-exported shared library headers must be included as well since they can help us with type information
 					// about template instantiations (instantiated from their headers).
-					c.sabi.Properties.ReexportedIncludeFlags = append(c.sabi.Properties.ReexportedIncludeFlags, flags...)
+					// -isystem headers are not included since for bionic libraries, abi-filtering is taken care of by version
+					// scripts.
+					c.sabi.Properties.ReexportedIncludes = append(
+						c.sabi.Properties.ReexportedIncludes, i.exportedDirs()...)
 				}
 			}
 
@@ -1882,12 +1907,16 @@
 
 	// Dedup exported flags from dependencies
 	depPaths.Flags = android.FirstUniqueStrings(depPaths.Flags)
+	depPaths.IncludeDirs = android.FirstUniqueStrings(depPaths.IncludeDirs)
+	depPaths.SystemIncludeDirs = android.FirstUniqueStrings(depPaths.SystemIncludeDirs)
 	depPaths.GeneratedHeaders = android.FirstUniquePaths(depPaths.GeneratedHeaders)
+	depPaths.ReexportedDirs = android.FirstUniqueStrings(depPaths.ReexportedDirs)
+	depPaths.ReexportedSystemDirs = android.FirstUniqueStrings(depPaths.ReexportedSystemDirs)
 	depPaths.ReexportedFlags = android.FirstUniqueStrings(depPaths.ReexportedFlags)
-	depPaths.ReexportedFlagsDeps = android.FirstUniquePaths(depPaths.ReexportedFlagsDeps)
+	depPaths.ReexportedDeps = android.FirstUniquePaths(depPaths.ReexportedDeps)
 
 	if c.sabi != nil {
-		c.sabi.Properties.ReexportedIncludeFlags = android.FirstUniqueStrings(c.sabi.Properties.ReexportedIncludeFlags)
+		c.sabi.Properties.ReexportedIncludes = android.FirstUniqueStrings(c.sabi.Properties.ReexportedIncludes)
 	}
 
 	return depPaths
@@ -1925,11 +1954,16 @@
 	return c.outputFile
 }
 
-func (c *Module) Srcs() android.Paths {
-	if c.outputFile.Valid() {
-		return android.Paths{c.outputFile.Path()}
+func (c *Module) OutputFiles(tag string) (android.Paths, error) {
+	switch tag {
+	case "":
+		if c.outputFile.Valid() {
+			return android.Paths{c.outputFile.Path()}, nil
+		}
+		return android.Paths{}, nil
+	default:
+		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
 	}
-	return android.Paths{}
 }
 
 func (c *Module) static() bool {
@@ -2006,7 +2040,11 @@
 }
 
 func (c *Module) IDEInfo(dpInfo *android.IdeInfo) {
-	dpInfo.Srcs = append(dpInfo.Srcs, c.Srcs().Strings()...)
+	outputFiles, err := c.OutputFiles("")
+	if err != nil {
+		panic(err)
+	}
+	dpInfo.Srcs = append(dpInfo.Srcs, outputFiles.Strings()...)
 }
 
 func (c *Module) AndroidMkWriteAdditionalDependenciesForSourceAbiDiff(w io.Writer) {
@@ -2026,9 +2064,6 @@
 	android.ApexModuleBase
 }
 
-func (*Defaults) GenerateAndroidBuildActions(ctx android.ModuleContext) {
-}
-
 // cc_defaults provides a set of properties that can be inherited by other cc
 // modules. A module can use the properties from a cc_defaults using
 // `defaults: ["<:default_module_name>"]`. Properties of both modules are
diff --git a/cc/cc_test.go b/cc/cc_test.go
index 997e11e..ca34185 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -184,7 +184,7 @@
 		cc_library {
 			name: "libTest",
 			srcs: ["foo.c"],
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			vendor_available: true,
@@ -647,7 +647,7 @@
 	testCcError(t, "module \".*\" variant \".*\": link.* \".*\" which is not LL-NDK, VNDK-SP, .*double_loadable", `
 		cc_library {
 			name: "libllndk",
-			no_libgcc: true,
+			no_libcrt: true,
 			shared_libs: ["libnondoubleloadable"],
 		}
 
@@ -1786,7 +1786,7 @@
 		shared_libs: ["libllndk"],
 		vendor: true,
 		srcs: ["foo.c"],
-		no_libgcc: true,
+		no_libcrt: true,
 		nocrt: true,
 	}
 	`)
@@ -1815,7 +1815,7 @@
 	cc_library {
 		name: "libvendor_available1",
 		vendor_available: true,
-		no_libgcc : true,
+		no_libcrt : true,
 		nocrt : true,
 		system_shared_libs : [],
 	}
@@ -1823,7 +1823,7 @@
 		name: "libvendor_available2",
 		vendor_available: true,
 		runtime_libs: ["libvendor_available1"],
-		no_libgcc : true,
+		no_libcrt : true,
 		nocrt : true,
 		system_shared_libs : [],
 	}
@@ -1836,21 +1836,21 @@
 				exclude_runtime_libs: ["libvendor_available1"],
 			}
 		},
-		no_libgcc : true,
+		no_libcrt : true,
 		nocrt : true,
 		system_shared_libs : [],
 	}
 	cc_library {
 		name: "libcore",
 		runtime_libs: ["libvendor_available1"],
-		no_libgcc : true,
+		no_libcrt : true,
 		nocrt : true,
 		system_shared_libs : [],
 	}
 	cc_library {
 		name: "libvendor1",
 		vendor: true,
-		no_libgcc : true,
+		no_libcrt : true,
 		nocrt : true,
 		system_shared_libs : [],
 	}
@@ -1858,7 +1858,7 @@
 		name: "libvendor2",
 		vendor: true,
 		runtime_libs: ["libvendor_available1", "libvendor1"],
-		no_libgcc : true,
+		no_libcrt : true,
 		nocrt : true,
 		system_shared_libs : [],
 	}
@@ -2050,7 +2050,7 @@
 		name: "libvendorpublic",
 		srcs: ["foo.c"],
 		vendor: true,
-		no_libgcc: true,
+		no_libcrt: true,
 		nocrt: true,
 	}
 
@@ -2059,7 +2059,7 @@
 		shared_libs: ["libvendorpublic"],
 		vendor: false,
 		srcs: ["foo.c"],
-		no_libgcc: true,
+		no_libcrt: true,
 		nocrt: true,
 	}
 	cc_library {
@@ -2067,7 +2067,7 @@
 		shared_libs: ["libvendorpublic"],
 		vendor: true,
 		srcs: ["foo.c"],
-		no_libgcc: true,
+		no_libcrt: true,
 		nocrt: true,
 	}
 	`)
diff --git a/cc/compdb.go b/cc/compdb.go
index 1102651..ecc67b8 100644
--- a/cc/compdb.go
+++ b/cc/compdb.go
@@ -141,7 +141,7 @@
 		isAsm = false
 		isCpp = false
 		clangPath = ccPath
-	case ".cpp", ".cc", ".mm":
+	case ".cpp", ".cc", ".cxx", ".mm":
 		isAsm = false
 		isCpp = true
 		clangPath = cxxPath
diff --git a/cc/compiler.go b/cc/compiler.go
index 7667ae7..fd6184b 100644
--- a/cc/compiler.go
+++ b/cc/compiler.go
@@ -225,11 +225,6 @@
 		deps = protoDeps(ctx, deps, &compiler.Proto, Bool(compiler.Properties.Proto.Static))
 	}
 
-	if compiler.hasSrcExt(".sysprop") {
-		deps.HeaderLibs = append(deps.HeaderLibs, "libbase_headers")
-		deps.SharedLibs = append(deps.SharedLibs, "liblog")
-	}
-
 	if Bool(compiler.Properties.Openmp) {
 		deps.StaticLibs = append(deps.StaticLibs, "libomp")
 	}
diff --git a/cc/config/global.go b/cc/config/global.go
index 24075d9..a27246e 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -122,8 +122,8 @@
 
 	// prebuilts/clang default settings.
 	ClangDefaultBase         = "prebuilts/clang/host"
-	ClangDefaultVersion      = "clang-r353983c"
-	ClangDefaultShortVersion = "9.0.3"
+	ClangDefaultVersion      = "clang-r353983d"
+	ClangDefaultShortVersion = "9.0.4"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{
diff --git a/cc/gen.go b/cc/gen.go
index ae761d0..7516b28 100644
--- a/cc/gen.go
+++ b/cc/gen.go
@@ -16,6 +16,7 @@
 
 import (
 	"path/filepath"
+	"strings"
 
 	"github.com/google/blueprint"
 
@@ -24,6 +25,7 @@
 
 func init() {
 	pctx.SourcePathVariable("lexCmd", "prebuilts/build-tools/${config.HostPrebuiltTag}/bin/flex")
+	pctx.SourcePathVariable("m4Cmd", "prebuilts/build-tools/${config.HostPrebuiltTag}/bin/m4")
 
 	pctx.HostBinToolVariable("aidlCmd", "aidl-cpp")
 	pctx.HostBinToolVariable("syspropCmd", "sysprop_cpp")
@@ -32,26 +34,17 @@
 var (
 	lex = pctx.AndroidStaticRule("lex",
 		blueprint.RuleParams{
-			Command:     "$lexCmd -o$out $in",
-			CommandDeps: []string{"$lexCmd"},
+			Command:     "M4=$m4Cmd $lexCmd -o$out $in",
+			CommandDeps: []string{"$lexCmd", "$m4Cmd"},
 		})
 
-	aidl = pctx.AndroidStaticRule("aidl",
-		blueprint.RuleParams{
-			Command:     "$aidlCmd -d${out}.d --ninja $aidlFlags $in $outDir $out",
-			CommandDeps: []string{"$aidlCmd"},
-			Depfile:     "${out}.d",
-			Deps:        blueprint.DepsGCC,
-		},
-		"aidlFlags", "outDir")
-
 	sysprop = pctx.AndroidStaticRule("sysprop",
 		blueprint.RuleParams{
-			Command: "$syspropCmd --header-dir=$headerOutDir --system-header-dir=$systemOutDir " +
+			Command: "$syspropCmd --header-dir=$headerOutDir --public-header-dir=$publicOutDir " +
 				"--source-dir=$srcOutDir --include-name=$includeName $in",
 			CommandDeps: []string{"$syspropCmd"},
 		},
-		"headerOutDir", "systemOutDir", "srcOutDir", "includeName")
+		"headerOutDir", "publicOutDir", "srcOutDir", "includeName")
 
 	windmc = pctx.AndroidStaticRule("windmc",
 		blueprint.RuleParams{
@@ -105,6 +98,7 @@
 	}
 
 	cmd.Text("BISON_PKGDATADIR=prebuilts/build-tools/common/bison").
+		FlagWithInput("M4=", ctx.Config().PrebuiltBuildTool(ctx, "m4")).
 		Tool(ctx.Config().PrebuiltBuildTool(ctx, "bison")).
 		Flag("-d").
 		Flags(flags).
@@ -114,20 +108,37 @@
 	return ret
 }
 
-func genAidl(ctx android.ModuleContext, aidlFile android.Path, outFile android.ModuleGenPath, aidlFlags string) android.Paths {
-	ctx.Build(pctx, android.BuildParams{
-		Rule:        aidl,
-		Description: "aidl " + aidlFile.Rel(),
-		Output:      outFile,
-		Input:       aidlFile,
-		Args: map[string]string{
-			"aidlFlags": aidlFlags,
-			"outDir":    android.PathForModuleGen(ctx, "aidl").String(),
-		},
-	})
+func genAidl(ctx android.ModuleContext, rule *android.RuleBuilder, aidlFile android.Path,
+	outFile, depFile android.ModuleGenPath, aidlFlags string) android.Paths {
 
-	// TODO: This should return the generated headers, not the source file.
-	return android.Paths{outFile}
+	aidlPackage := strings.TrimSuffix(aidlFile.Rel(), aidlFile.Base())
+	baseName := strings.TrimSuffix(aidlFile.Base(), aidlFile.Ext())
+	shortName := strings.TrimPrefix(baseName, "I")
+
+	outDir := android.PathForModuleGen(ctx, "aidl")
+	headerI := outDir.Join(ctx, aidlPackage, baseName+".h")
+	headerBn := outDir.Join(ctx, aidlPackage, "Bn"+shortName+".h")
+	headerBp := outDir.Join(ctx, aidlPackage, "Bp"+shortName+".h")
+
+	cmd := rule.Command()
+	cmd.Tool(ctx.Config().HostToolPath(ctx, "aidl-cpp")).
+		FlagWithDepFile("-d", depFile).
+		Flag("--ninja").
+		Flag(aidlFlags).
+		Input(aidlFile).
+		OutputDir().
+		Output(outFile).
+		ImplicitOutputs(android.WritablePaths{
+			headerI,
+			headerBn,
+			headerBp,
+		})
+
+	return android.Paths{
+		headerI,
+		headerBn,
+		headerBp,
+	}
 }
 
 func genLex(ctx android.ModuleContext, lexFile android.Path, outFile android.ModuleGenPath) {
@@ -141,7 +152,7 @@
 
 func genSysprop(ctx android.ModuleContext, syspropFile android.Path) (android.Path, android.Path) {
 	headerFile := android.PathForModuleGen(ctx, "sysprop", "include", syspropFile.Rel()+".h")
-	systemHeaderFile := android.PathForModuleGen(ctx, "sysprop/system", "include", syspropFile.Rel()+".h")
+	publicHeaderFile := android.PathForModuleGen(ctx, "sysprop/public", "include", syspropFile.Rel()+".h")
 	cppFile := android.PathForModuleGen(ctx, "sysprop", syspropFile.Rel()+".cpp")
 
 	ctx.Build(pctx, android.BuildParams{
@@ -152,7 +163,7 @@
 		Input:          syspropFile,
 		Args: map[string]string{
 			"headerOutDir": filepath.Dir(headerFile.String()),
-			"systemOutDir": filepath.Dir(systemHeaderFile.String()),
+			"publicOutDir": filepath.Dir(publicHeaderFile.String()),
 			"srcOutDir":    filepath.Dir(cppFile.String()),
 			"includeName":  syspropFile.Rel() + ".h",
 		},
@@ -187,6 +198,8 @@
 	var deps android.Paths
 	var rsFiles android.Paths
 
+	var aidlRule *android.RuleBuilder
+
 	var yaccRule_ *android.RuleBuilder
 	yaccRule := func() *android.RuleBuilder {
 		if yaccRule_ == nil {
@@ -218,9 +231,13 @@
 			srcFiles[i] = ccFile
 			deps = append(deps, headerFile)
 		case ".aidl":
+			if aidlRule == nil {
+				aidlRule = android.NewRuleBuilder().Sbox(android.PathForModuleGen(ctx, "aidl"))
+			}
 			cppFile := android.GenPathWithExt(ctx, "aidl", srcFile, "cpp")
+			depFile := android.GenPathWithExt(ctx, "aidl", srcFile, "cpp.d")
 			srcFiles[i] = cppFile
-			deps = append(deps, genAidl(ctx, srcFile, cppFile, buildFlags.aidlFlags)...)
+			deps = append(deps, genAidl(ctx, aidlRule, srcFile, cppFile, depFile, buildFlags.aidlFlags)...)
 		case ".rs", ".fs":
 			cppFile := rsGeneratedCppFile(ctx, srcFile)
 			rsFiles = append(rsFiles, srcFiles[i])
@@ -236,6 +253,10 @@
 		}
 	}
 
+	if aidlRule != nil {
+		aidlRule.Build(pctx, ctx, "aidl", "gen aidl")
+	}
+
 	if yaccRule_ != nil {
 		yaccRule_.Build(pctx, ctx, "yacc", "gen yacc")
 	}
diff --git a/cc/gen_test.go b/cc/gen_test.go
index a0f7308..e4219d9 100644
--- a/cc/gen_test.go
+++ b/cc/gen_test.go
@@ -15,6 +15,7 @@
 package cc
 
 import (
+	"path/filepath"
 	"testing"
 )
 
@@ -32,7 +33,7 @@
 		aidl := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("aidl")
 		libfoo := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Module().(*Module)
 
-		if !inList("-I"+aidl.Args["outDir"], libfoo.flags.GlobalFlags) {
+		if !inList("-I"+filepath.Dir(aidl.Output.String()), libfoo.flags.GlobalFlags) {
 			t.Errorf("missing aidl includes in global flags")
 		}
 	})
@@ -55,7 +56,7 @@
 		aidl := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Rule("aidl")
 		libfoo := ctx.ModuleForTests("libfoo", "android_arm_armv7-a-neon_core_shared").Module().(*Module)
 
-		if !inList("-I"+aidl.Args["outDir"], libfoo.flags.GlobalFlags) {
+		if !inList("-I"+filepath.Dir(aidl.Output.String()), libfoo.flags.GlobalFlags) {
 			t.Errorf("missing aidl includes in global flags")
 		}
 	})
diff --git a/cc/genrule.go b/cc/genrule.go
index decf6ea..e594f4b 100644
--- a/cc/genrule.go
+++ b/cc/genrule.go
@@ -42,5 +42,7 @@
 
 	android.InitAndroidArchModule(module, android.HostAndDeviceSupported, android.MultilibBoth)
 
+	android.InitApexModule(module)
+
 	return module
 }
diff --git a/cc/kernel_headers.go b/cc/kernel_headers.go
index c1da578..fff419e 100644
--- a/cc/kernel_headers.go
+++ b/cc/kernel_headers.go
@@ -25,9 +25,7 @@
 func (stub *kernelHeadersDecorator) link(ctx ModuleContext, flags Flags, deps PathDeps, objs Objects) android.Path {
 	if ctx.Device() {
 		f := &stub.libraryDecorator.flagExporter
-		for _, dir := range ctx.DeviceConfig().DeviceKernelHeaderDirs() {
-			f.flags = append(f.flags, "-isystem "+dir)
-		}
+		f.reexportSystemDirs(ctx.DeviceConfig().DeviceKernelHeaderDirs()...)
 	}
 	return stub.libraryDecorator.linkStatic(ctx, flags, deps, objs)
 }
diff --git a/cc/library.go b/cc/library.go
index 3053831..5fbb36e 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -15,6 +15,7 @@
 package cc
 
 import (
+	"fmt"
 	"io"
 	"path/filepath"
 	"regexp"
@@ -207,8 +208,10 @@
 type flagExporter struct {
 	Properties FlagExporterProperties
 
-	flags     []string
-	flagsDeps android.Paths
+	dirs       []string
+	systemDirs []string
+	flags      []string
+	deps       android.Paths
 }
 
 func (f *flagExporter) exportedIncludes(ctx ModuleContext) android.Paths {
@@ -219,32 +222,57 @@
 	}
 }
 
-func (f *flagExporter) exportIncludes(ctx ModuleContext, inc string) {
-	includeDirs := f.exportedIncludes(ctx)
-	for _, dir := range includeDirs.Strings() {
-		f.flags = append(f.flags, inc+dir)
-	}
+func (f *flagExporter) exportIncludes(ctx ModuleContext) {
+	f.dirs = append(f.dirs, f.exportedIncludes(ctx).Strings()...)
 }
 
-func (f *flagExporter) reexportFlags(flags []string) {
+func (f *flagExporter) exportIncludesAsSystem(ctx ModuleContext) {
+	f.systemDirs = append(f.systemDirs, f.exportedIncludes(ctx).Strings()...)
+}
+
+func (f *flagExporter) reexportDirs(dirs ...string) {
+	f.dirs = append(f.dirs, dirs...)
+}
+
+func (f *flagExporter) reexportSystemDirs(dirs ...string) {
+	f.systemDirs = append(f.systemDirs, dirs...)
+}
+
+func (f *flagExporter) reexportFlags(flags ...string) {
+	for _, flag := range flags {
+		if strings.HasPrefix(flag, "-I") || strings.HasPrefix(flag, "-isystem") {
+			panic(fmt.Errorf("Exporting invalid flag %q: "+
+				"use reexportDirs or reexportSystemDirs to export directories", flag))
+		}
+	}
 	f.flags = append(f.flags, flags...)
 }
 
-func (f *flagExporter) reexportDeps(deps android.Paths) {
-	f.flagsDeps = append(f.flagsDeps, deps...)
+func (f *flagExporter) reexportDeps(deps ...android.Path) {
+	f.deps = append(f.deps, deps...)
+}
+
+func (f *flagExporter) exportedDirs() []string {
+	return f.dirs
+}
+
+func (f *flagExporter) exportedSystemDirs() []string {
+	return f.systemDirs
 }
 
 func (f *flagExporter) exportedFlags() []string {
 	return f.flags
 }
 
-func (f *flagExporter) exportedFlagsDeps() android.Paths {
-	return f.flagsDeps
+func (f *flagExporter) exportedDeps() android.Paths {
+	return f.deps
 }
 
 type exportedFlagsProducer interface {
+	exportedDirs() []string
+	exportedSystemDirs() []string
 	exportedFlags() []string
-	exportedFlagsDeps() android.Paths
+	exportedDeps() android.Paths
 }
 
 var _ exportedFlagsProducer = (*flagExporter)(nil)
@@ -256,9 +284,7 @@
 	MutatedProperties LibraryMutatedProperties
 
 	// For reusing static library objects for shared library
-	reuseObjects       Objects
-	reuseExportedFlags []string
-	reuseExportedDeps  android.Paths
+	reuseObjects Objects
 
 	// table-of-contents file to optimize out relinking when possible
 	tocFile android.OptionalPath
@@ -405,25 +431,6 @@
 	return flags
 }
 
-func extractExportIncludesFromFlags(flags []string) []string {
-	// This method is used in the  generation of rules which produce
-	// abi-dumps for source files. Exported headers are needed to infer the
-	// abi exported by a library and filter out the rest of the abi dumped
-	// from a source. We extract the include flags exported by a library.
-	// This includes the flags exported which are re-exported from static
-	// library dependencies, exported header library dependencies and
-	// generated header dependencies. -isystem headers are not included
-	// since for bionic libraries, abi-filtering is taken care of by version
-	// scripts.
-	var exportedIncludes []string
-	for _, flag := range flags {
-		if strings.HasPrefix(flag, "-I") {
-			exportedIncludes = append(exportedIncludes, flag)
-		}
-	}
-	return exportedIncludes
-}
-
 func (library *libraryDecorator) shouldCreateVndkSourceAbiDump(ctx ModuleContext) bool {
 	if library.Properties.Header_abi_checker.Enabled != nil {
 		return Bool(library.Properties.Header_abi_checker.Enabled)
@@ -456,8 +463,8 @@
 		for _, dir := range exportIncludeDirs.Strings() {
 			SourceAbiFlags = append(SourceAbiFlags, "-I"+dir)
 		}
-		for _, reexportedInclude := range extractExportIncludesFromFlags(library.sabi.Properties.ReexportedIncludeFlags) {
-			SourceAbiFlags = append(SourceAbiFlags, reexportedInclude)
+		for _, reexportedInclude := range library.sabi.Properties.ReexportedIncludes {
+			SourceAbiFlags = append(SourceAbiFlags, "-I"+reexportedInclude)
 		}
 		flags.SAbiFlags = SourceAbiFlags
 		total_length := len(library.baseCompiler.Properties.Srcs) + len(deps.GeneratedSources) + len(library.Properties.Shared.Srcs) +
@@ -487,7 +494,7 @@
 	getWholeStaticMissingDeps() []string
 	static() bool
 	objs() Objects
-	reuseObjs() (Objects, []string, android.Paths)
+	reuseObjs() (Objects, exportedFlagsProducer)
 	toc() android.OptionalPath
 
 	// Returns true if the build options for the module have selected a static or shared build
@@ -644,7 +651,7 @@
 
 	TransformObjToStaticLib(ctx, library.objects.objFiles, builderFlags, outputFile, objs.tidyFiles)
 
-	library.coverageOutputFile = TransformCoverageFilesToLib(ctx, library.objects, builderFlags,
+	library.coverageOutputFile = TransformCoverageFilesToZip(ctx, library.objects,
 		ctx.ModuleName()+library.MutatedProperties.VariantName)
 
 	library.wholeStaticMissingDeps = ctx.GetMissingDependencies()
@@ -721,7 +728,7 @@
 		}
 		strippedOutputFile := outputFile
 		outputFile = android.PathForModuleOut(ctx, "unstripped", fileName)
-		library.stripper.strip(ctx, outputFile, strippedOutputFile, builderFlags)
+		library.stripper.stripExecutableOrSharedLib(ctx, outputFile, strippedOutputFile, builderFlags)
 	}
 
 	library.unstrippedOutputFile = outputFile
@@ -738,7 +745,7 @@
 			if library.stripper.needsStrip(ctx) {
 				out := android.PathForModuleOut(ctx, "versioned-stripped", fileName)
 				library.distFile = android.OptionalPathForPath(out)
-				library.stripper.strip(ctx, versionedOutputFile, out, builderFlags)
+				library.stripper.stripExecutableOrSharedLib(ctx, versionedOutputFile, out, builderFlags)
 			}
 
 			library.injectVersionSymbol(ctx, outputFile, versionedOutputFile)
@@ -764,7 +771,7 @@
 	objs.sAbiDumpFiles = append(objs.sAbiDumpFiles, deps.StaticLibObjs.sAbiDumpFiles...)
 	objs.sAbiDumpFiles = append(objs.sAbiDumpFiles, deps.WholeStaticLibObjs.sAbiDumpFiles...)
 
-	library.coverageOutputFile = TransformCoverageFilesToLib(ctx, objs, builderFlags, library.getLibName(ctx))
+	library.coverageOutputFile = TransformCoverageFilesToZip(ctx, objs, library.getLibName(ctx))
 	library.linkSAbiDumpFiles(ctx, objs, fileName, ret)
 
 	return ret
@@ -803,7 +810,7 @@
 }
 
 func (library *libraryDecorator) linkSAbiDumpFiles(ctx ModuleContext, objs Objects, fileName string, soFile android.Path) {
-	if len(objs.sAbiDumpFiles) > 0 && library.shouldCreateVndkSourceAbiDump(ctx) {
+	if library.shouldCreateVndkSourceAbiDump(ctx) {
 		vndkVersion := ctx.DeviceConfig().PlatformVndkVersion()
 		if ver := ctx.DeviceConfig().VndkVersion(); ver != "" && ver != "current" {
 			vndkVersion = ver
@@ -814,8 +821,8 @@
 		for _, dir := range exportIncludeDirs.Strings() {
 			SourceAbiFlags = append(SourceAbiFlags, "-I"+dir)
 		}
-		for _, reexportedInclude := range extractExportIncludesFromFlags(library.sabi.Properties.ReexportedIncludeFlags) {
-			SourceAbiFlags = append(SourceAbiFlags, reexportedInclude)
+		for _, reexportedInclude := range library.sabi.Properties.ReexportedIncludes {
+			SourceAbiFlags = append(SourceAbiFlags, "-I"+reexportedInclude)
 		}
 		exportedHeaderFlags := strings.Join(SourceAbiFlags, " ")
 		library.sAbiOutputFile = TransformDumpToLinkedDump(ctx, objs.sAbiDumpFiles, soFile, fileName, exportedHeaderFlags,
@@ -842,19 +849,17 @@
 		out = library.linkShared(ctx, flags, deps, objs)
 	}
 
-	library.exportIncludes(ctx, "-I")
-	library.reexportFlags(deps.ReexportedFlags)
-	library.reexportDeps(deps.ReexportedFlagsDeps)
+	library.exportIncludes(ctx)
+	library.reexportDirs(deps.ReexportedDirs...)
+	library.reexportSystemDirs(deps.ReexportedSystemDirs...)
+	library.reexportFlags(deps.ReexportedFlags...)
+	library.reexportDeps(deps.ReexportedDeps...)
 
 	if Bool(library.Properties.Aidl.Export_aidl_headers) {
 		if library.baseCompiler.hasSrcExt(".aidl") {
-			flags := []string{
-				"-I" + android.PathForModuleGen(ctx, "aidl").String(),
-			}
-			library.reexportFlags(flags)
-			library.reuseExportedFlags = append(library.reuseExportedFlags, flags...)
-			library.reexportDeps(library.baseCompiler.pathDeps) // TODO: restrict to aidl deps
-			library.reuseExportedDeps = append(library.reuseExportedDeps, library.baseCompiler.pathDeps...)
+			dir := android.PathForModuleGen(ctx, "aidl").String()
+			library.reexportDirs(dir)
+			library.reexportDeps(library.baseCompiler.pathDeps...) // TODO: restrict to aidl deps
 		}
 	}
 
@@ -862,45 +867,34 @@
 		if library.baseCompiler.hasSrcExt(".proto") {
 			includes := []string{}
 			if flags.proto.CanonicalPathFromRoot {
-				includes = append(includes, "-I"+flags.proto.SubDir.String())
+				includes = append(includes, flags.proto.SubDir.String())
 			}
-			includes = append(includes, "-I"+flags.proto.Dir.String())
-			library.reexportFlags(includes)
-			library.reuseExportedFlags = append(library.reuseExportedFlags, includes...)
-			library.reexportDeps(library.baseCompiler.pathDeps) // TODO: restrict to proto deps
-			library.reuseExportedDeps = append(library.reuseExportedDeps, library.baseCompiler.pathDeps...)
+			includes = append(includes, flags.proto.Dir.String())
+			library.reexportDirs(includes...)
+			library.reexportDeps(library.baseCompiler.pathDeps...) // TODO: restrict to proto deps
 		}
 	}
 
 	if library.baseCompiler.hasSrcExt(".sysprop") {
-		internalFlags := []string{
-			"-I" + android.PathForModuleGen(ctx, "sysprop", "include").String(),
-		}
-		systemFlags := []string{
-			"-I" + android.PathForModuleGen(ctx, "sysprop/system", "include").String(),
-		}
-
-		flags := internalFlags
-
+		dir := android.PathForModuleGen(ctx, "sysprop", "include").String()
 		if library.Properties.Sysprop.Platform != nil {
 			isProduct := ctx.ProductSpecific() && !ctx.useVndk()
 			isVendor := ctx.useVndk()
 			isOwnerPlatform := Bool(library.Properties.Sysprop.Platform)
 
-			useSystem := isProduct || (isOwnerPlatform == isVendor)
+			usePublic := isProduct || (isOwnerPlatform == isVendor)
 
-			if useSystem {
-				flags = systemFlags
+			if usePublic {
+				dir = android.PathForModuleGen(ctx, "sysprop/public", "include").String()
 			}
 		}
 
-		library.reexportFlags(flags)
-		library.reexportDeps(library.baseCompiler.pathDeps)
-		library.reuseExportedFlags = append(library.reuseExportedFlags, flags...)
+		library.reexportDirs(dir)
+		library.reexportDeps(library.baseCompiler.pathDeps...)
 	}
 
 	if library.buildStubs() {
-		library.reexportFlags([]string{"-D" + versioningMacroName(ctx.ModuleName()) + "=" + library.stubsVersion()})
+		library.reexportFlags("-D" + versioningMacroName(ctx.ModuleName()) + "=" + library.stubsVersion())
 	}
 
 	return out
@@ -922,8 +916,8 @@
 	return library.objects
 }
 
-func (library *libraryDecorator) reuseObjs() (Objects, []string, android.Paths) {
-	return library.reuseObjects, library.reuseExportedFlags, library.reuseExportedDeps
+func (library *libraryDecorator) reuseObjs() (Objects, exportedFlagsProducer) {
+	return library.reuseObjects, &library.flagExporter
 }
 
 func (library *libraryDecorator) toc() android.OptionalPath {
diff --git a/cc/linker.go b/cc/linker.go
index 986a562..dda2fcb 100644
--- a/cc/linker.go
+++ b/cc/linker.go
@@ -57,9 +57,6 @@
 	// This flag should only be necessary for compiling low-level libraries like libc.
 	Allow_undefined_symbols *bool `android:"arch_variant"`
 
-	// don't link in libgcc.a
-	No_libgcc *bool
-
 	// don't link in libclang_rt.builtins-*.a
 	No_libcrt *bool `android:"arch_variant"`
 
@@ -230,9 +227,6 @@
 			deps.LateStaticLibs = append(deps.LateStaticLibs, config.BuiltinsRuntimeLibrary(ctx.toolchain()))
 			deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
 			deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc_stripped")
-		} else if !Bool(linker.Properties.No_libgcc) {
-			deps.LateStaticLibs = append(deps.LateStaticLibs, "libatomic")
-			deps.LateStaticLibs = append(deps.LateStaticLibs, "libgcc")
 		}
 
 		systemSharedLibs := linker.Properties.System_shared_libs
diff --git a/cc/llndk_library.go b/cc/llndk_library.go
index 6cdf5c7..8290103 100644
--- a/cc/llndk_library.go
+++ b/cc/llndk_library.go
@@ -134,6 +134,7 @@
 	if !Bool(stub.Properties.Unversioned) {
 		linkerScriptFlag := "-Wl,--version-script," + stub.versionScriptPath.String()
 		flags.LdFlags = append(flags.LdFlags, linkerScriptFlag)
+		flags.LdFlagsDeps = append(flags.LdFlagsDeps, stub.versionScriptPath)
 	}
 
 	if len(stub.Properties.Export_preprocessed_headers) > 0 {
@@ -144,17 +145,17 @@
 			timestampFiles = append(timestampFiles, stub.processHeaders(ctx, dir, genHeaderOutDir))
 		}
 
-		includePrefix := "-I"
 		if Bool(stub.Properties.Export_headers_as_system) {
-			includePrefix = "-isystem "
+			stub.reexportSystemDirs(genHeaderOutDir.String())
+		} else {
+			stub.reexportDirs(genHeaderOutDir.String())
 		}
 
-		stub.reexportFlags([]string{includePrefix + genHeaderOutDir.String()})
-		stub.reexportDeps(timestampFiles)
+		stub.reexportDeps(timestampFiles...)
 	}
 
 	if Bool(stub.Properties.Export_headers_as_system) {
-		stub.exportIncludes(ctx, "-isystem ")
+		stub.exportIncludesAsSystem(ctx)
 		stub.libraryDecorator.flagExporter.Properties.Export_include_dirs = []string{}
 	}
 
diff --git a/cc/makevars.go b/cc/makevars.go
index a71f479..78a32c8 100644
--- a/cc/makevars.go
+++ b/cc/makevars.go
@@ -161,6 +161,8 @@
 
 	ctx.Strict("AIDL_CPP", "${aidlCmd}")
 
+	ctx.Strict("M4", "${m4Cmd}")
+
 	ctx.Strict("RS_GLOBAL_INCLUDES", "${config.RsGlobalIncludes}")
 
 	ctx.Strict("SOONG_STRIP_PATH", "${stripPath}")
diff --git a/cc/ndk_library.go b/cc/ndk_library.go
index ff990b5..969cb3f 100644
--- a/cc/ndk_library.go
+++ b/cc/ndk_library.go
@@ -121,7 +121,7 @@
 	}
 }
 
-func normalizeNdkApiLevel(ctx android.BaseContext, apiLevel string,
+func normalizeNdkApiLevel(ctx android.BaseModuleContext, apiLevel string,
 	arch android.Arch) (string, error) {
 
 	if apiLevel == "current" {
@@ -167,7 +167,7 @@
 	return strconv.Atoi(firstSupportedVersion)
 }
 
-func shouldUseVersionScript(ctx android.BaseContext, stub *stubDecorator) (bool, error) {
+func shouldUseVersionScript(ctx android.BaseModuleContext, stub *stubDecorator) (bool, error) {
 	// unversioned_until is normally empty, in which case we should use the version script.
 	if String(stub.properties.Unversioned_until) == "" {
 		return true, nil
@@ -337,6 +337,7 @@
 	if useVersionScript {
 		linkerScriptFlag := "-Wl,--version-script," + stub.versionScriptPath.String()
 		flags.LdFlags = append(flags.LdFlags, linkerScriptFlag)
+		flags.LdFlagsDeps = append(flags.LdFlagsDeps, stub.versionScriptPath)
 	}
 
 	return stub.libraryDecorator.link(ctx, flags, deps, objs)
diff --git a/cc/ndk_prebuilt.go b/cc/ndk_prebuilt.go
index 026ff22..4356732 100644
--- a/cc/ndk_prebuilt.go
+++ b/cc/ndk_prebuilt.go
@@ -25,7 +25,7 @@
 func init() {
 	android.RegisterModuleType("ndk_prebuilt_object", ndkPrebuiltObjectFactory)
 	android.RegisterModuleType("ndk_prebuilt_static_stl", ndkPrebuiltStaticStlFactory)
-	android.RegisterModuleType("ndk_prebuilt_shared_stl", ndkPrebuiltSharedStlFactory)
+	android.RegisterModuleType("ndk_prebuilt_shared_stl", NdkPrebuiltSharedStlFactory)
 }
 
 // NDK prebuilt libraries.
@@ -107,7 +107,7 @@
 // library (stl) library for linking operation. The soong's module name format
 // is ndk_<NAME>.so where the library is located under
 // ./prebuilts/ndk/current/sources/cxx-stl/llvm-libc++/libs/$(HOST_ARCH)/<NAME>.so.
-func ndkPrebuiltSharedStlFactory() android.Module {
+func NdkPrebuiltSharedStlFactory() android.Module {
 	module, library := NewLibrary(android.DeviceSupported)
 	library.BuildOnlyShared()
 	module.compiler = nil
@@ -151,7 +151,7 @@
 		ctx.ModuleErrorf("NDK prebuilt libraries must have an ndk_lib prefixed name")
 	}
 
-	ndk.exportIncludes(ctx, "-isystem ")
+	ndk.exportIncludesAsSystem(ctx)
 
 	libName := strings.TrimPrefix(ctx.ModuleName(), "ndk_")
 	libExt := flags.Toolchain.ShlibSuffix()
diff --git a/cc/pgo.go b/cc/pgo.go
index 7334ea2..4e915ff 100644
--- a/cc/pgo.go
+++ b/cc/pgo.go
@@ -27,10 +27,9 @@
 
 var (
 	// Add flags to ignore warnings that profiles are old or missing for
-	// some functions, and turn on the experimental new pass manager.
+	// some functions.
 	profileUseOtherFlags = []string{
 		"-Wno-backend-plugin",
-		"-fexperimental-new-pass-manager",
 	}
 
 	globalPgoProfileProjects = []string{
diff --git a/cc/prebuilt.go b/cc/prebuilt.go
index 48e4667..dc6c43a 100644
--- a/cc/prebuilt.go
+++ b/cc/prebuilt.go
@@ -85,9 +85,11 @@
 	flags Flags, deps PathDeps, objs Objects) android.Path {
 	// TODO(ccross): verify shared library dependencies
 	if len(p.properties.Srcs) > 0 {
-		p.libraryDecorator.exportIncludes(ctx, "-I")
-		p.libraryDecorator.reexportFlags(deps.ReexportedFlags)
-		p.libraryDecorator.reexportDeps(deps.ReexportedFlagsDeps)
+		p.libraryDecorator.exportIncludes(ctx)
+		p.libraryDecorator.reexportDirs(deps.ReexportedDirs...)
+		p.libraryDecorator.reexportSystemDirs(deps.ReexportedSystemDirs...)
+		p.libraryDecorator.reexportFlags(deps.ReexportedFlags...)
+		p.libraryDecorator.reexportDeps(deps.ReexportedDeps...)
 
 		builderFlags := flagsToBuilderFlags(flags)
 
@@ -98,7 +100,7 @@
 			libName := ctx.baseModuleName() + flags.Toolchain.ShlibSuffix()
 			if p.needsStrip(ctx) {
 				stripped := android.PathForModuleOut(ctx, "stripped", libName)
-				p.strip(ctx, in, stripped, builderFlags)
+				p.stripExecutableOrSharedLib(ctx, in, stripped, builderFlags)
 				in = stripped
 			}
 
@@ -197,7 +199,7 @@
 
 		if p.needsStrip(ctx) {
 			stripped := android.PathForModuleOut(ctx, "stripped", fileName)
-			p.strip(ctx, in, stripped, builderFlags)
+			p.stripExecutableOrSharedLib(ctx, in, stripped, builderFlags)
 			in = stripped
 		}
 
diff --git a/cc/rs.go b/cc/rs.go
index 5421b92..fbc6bfb 100644
--- a/cc/rs.go
+++ b/cc/rs.go
@@ -72,11 +72,12 @@
 	stampFile := android.PathForModuleGen(ctx, "rs", "rs.stamp")
 	depFiles := make(android.WritablePaths, 0, len(rsFiles))
 	genFiles := make(android.WritablePaths, 0, 2*len(rsFiles))
+	headers := make(android.Paths, 0, len(rsFiles))
 	for _, rsFile := range rsFiles {
 		depFiles = append(depFiles, rsGeneratedDepFile(ctx, rsFile))
-		genFiles = append(genFiles,
-			rsGeneratedCppFile(ctx, rsFile),
-			rsGeneratedHFile(ctx, rsFile))
+		headerFile := rsGeneratedHFile(ctx, rsFile)
+		genFiles = append(genFiles, rsGeneratedCppFile(ctx, rsFile), headerFile)
+		headers = append(headers, headerFile)
 	}
 
 	ctx.Build(pctx, android.BuildParams{
@@ -92,7 +93,7 @@
 		},
 	})
 
-	return android.Paths{stampFile}
+	return headers
 }
 
 func rsFlags(ctx ModuleContext, flags Flags, properties *BaseCompilerProperties) Flags {
diff --git a/cc/sabi.go b/cc/sabi.go
index 451176f..ae7b31d 100644
--- a/cc/sabi.go
+++ b/cc/sabi.go
@@ -28,8 +28,8 @@
 )
 
 type SAbiProperties struct {
-	CreateSAbiDumps        bool `blueprint:"mutated"`
-	ReexportedIncludeFlags []string
+	CreateSAbiDumps    bool     `blueprint:"mutated"`
+	ReexportedIncludes []string `blueprint:"mutated"`
 }
 
 type sabi struct {
diff --git a/cc/sanitize.go b/cc/sanitize.go
index fdda7be..0eb9a74 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -40,7 +40,8 @@
 	hwasanCflags = []string{"-fno-omit-frame-pointer", "-Wno-frame-larger-than=",
 		"-mllvm", "-hwasan-create-frame-descriptions=0",
 		"-mllvm", "-hwasan-allow-ifunc",
-		"-fsanitize-hwaddress-abi=platform"}
+		"-fsanitize-hwaddress-abi=platform",
+		"-fno-experimental-new-pass-manager"}
 
 	cfiCflags = []string{"-flto", "-fsanitize-cfi-cross-dso",
 		"-fsanitize-blacklist=external/compiler-rt/lib/cfi/cfi_blacklist.txt"}
@@ -467,6 +468,10 @@
 		// TODO(b/131771163): LTO and Fuzzer support is mutually incompatible.
 		_, flags.LdFlags = removeFromList("-flto", flags.LdFlags)
 		flags.LdFlags = append(flags.LdFlags, "-fno-lto")
+
+		// TODO(b/133876586): Experimental PM breaks sanitizer coverage.
+		_, flags.CFlags = removeFromList("-fexperimental-new-pass-manager", flags.CFlags)
+		flags.CFlags = append(flags.CFlags, "-fno-experimental-new-pass-manager")
 	}
 
 	if Bool(sanitize.Properties.Sanitize.Cfi) {
@@ -700,8 +705,8 @@
 			if !isSanitizableDependencyTag(mctx.OtherModuleDependencyTag(child)) {
 				return false
 			}
-			if d, ok := child.(*Module); ok && d.static() && d.sanitize != nil {
 
+			if d, ok := child.(*Module); ok && d.static() && d.sanitize != nil {
 				if enableMinimalRuntime(d.sanitize) {
 					// If a static dependency is built with the minimal runtime,
 					// make sure we include the ubsan minimal runtime.
@@ -712,8 +717,17 @@
 					// make sure we include the ubsan runtime.
 					c.sanitize.Properties.UbsanRuntimeDep = true
 				}
+
+				if c.sanitize.Properties.MinimalRuntimeDep &&
+					c.sanitize.Properties.UbsanRuntimeDep {
+					// both flags that this mutator might set are true, so don't bother recursing
+					return false
+				}
+
+				return true
+			} else {
+				return false
 			}
-			return true
 		})
 	}
 }
diff --git a/cc/strip.go b/cc/strip.go
index 4daa759..f3e3374 100644
--- a/cc/strip.go
+++ b/cc/strip.go
@@ -41,7 +41,7 @@
 }
 
 func (stripper *stripper) strip(ctx ModuleContext, in android.Path, out android.ModuleOutPath,
-	flags builderFlags) {
+	flags builderFlags, isStaticLib bool) {
 	if ctx.Darwin() {
 		TransformDarwinStrip(ctx, in, out)
 	} else {
@@ -57,9 +57,19 @@
 		if Bool(stripper.StripProperties.Strip.Use_gnu_strip) {
 			flags.stripUseGnuStrip = true
 		}
-		if ctx.Config().Debuggable() && !flags.stripKeepMiniDebugInfo {
+		if ctx.Config().Debuggable() && !flags.stripKeepMiniDebugInfo && !isStaticLib {
 			flags.stripAddGnuDebuglink = true
 		}
 		TransformStrip(ctx, in, out, flags)
 	}
 }
+
+func (stripper *stripper) stripExecutableOrSharedLib(ctx ModuleContext, in android.Path,
+	out android.ModuleOutPath, flags builderFlags) {
+	stripper.strip(ctx, in, out, flags, false)
+}
+
+func (stripper *stripper) stripStaticLib(ctx ModuleContext, in android.Path, out android.ModuleOutPath,
+	flags builderFlags) {
+	stripper.strip(ctx, in, out, flags, true)
+}
diff --git a/cc/test.go b/cc/test.go
index dae2a37..c735fd9 100644
--- a/cc/test.go
+++ b/cc/test.go
@@ -64,6 +64,10 @@
 
 	// Test options.
 	Test_options TestOptions
+
+	// Add RootTargetPreparer to auto generated test config. This guarantees the test to run
+	// with root permission.
+	Require_root *bool
 }
 
 func init() {
@@ -273,18 +277,19 @@
 
 func (test *testBinary) install(ctx ModuleContext, file android.Path) {
 	test.data = android.PathsForModuleSrc(ctx, test.Properties.Data)
-	optionsMap := map[string]string{}
-	if Bool(test.testDecorator.Properties.Isolated) {
-		optionsMap["not-shardable"] = "true"
+	var configs []tradefed.Config
+	if Bool(test.Properties.Require_root) {
+		configs = append(configs, tradefed.Preparer{"com.android.tradefed.targetprep.RootTargetPreparer"})
 	}
-
+	if Bool(test.testDecorator.Properties.Isolated) {
+		configs = append(configs, tradefed.Option{"not-shardable", "true"})
+	}
 	if test.Properties.Test_options.Run_test_as != nil {
-		optionsMap["run-test-as"] = String(test.Properties.Test_options.Run_test_as)
+		configs = append(configs, tradefed.Option{"run-test-as", String(test.Properties.Test_options.Run_test_as)})
 	}
 
 	test.testConfig = tradefed.AutoGenNativeTestConfig(ctx, test.Properties.Test_config,
-		test.Properties.Test_config_template,
-		test.Properties.Test_suites, optionsMap)
+		test.Properties.Test_config_template, test.Properties.Test_suites, configs)
 
 	test.binaryDecorator.baseInstaller.dir = "nativetest"
 	test.binaryDecorator.baseInstaller.dir64 = "nativetest64"
@@ -371,6 +376,10 @@
 	// the name of the test configuration template (for example "AndroidTestTemplate.xml") that
 	// should be installed with the module.
 	Test_config_template *string `android:"path,arch_variant"`
+
+	// Add RootTargetPreparer to auto generated test config. This guarantees the test to run
+	// with root permission.
+	Require_root *bool
 }
 
 type benchmarkDecorator struct {
@@ -403,8 +412,12 @@
 
 func (benchmark *benchmarkDecorator) install(ctx ModuleContext, file android.Path) {
 	benchmark.data = android.PathsForModuleSrc(ctx, benchmark.Properties.Data)
+	var configs []tradefed.Config
+	if Bool(benchmark.Properties.Require_root) {
+		configs = append(configs, tradefed.Preparer{"com.android.tradefed.targetprep.RootTargetPreparer"})
+	}
 	benchmark.testConfig = tradefed.AutoGenNativeBenchmarkTestConfig(ctx, benchmark.Properties.Test_config,
-		benchmark.Properties.Test_config_template, benchmark.Properties.Test_suites)
+		benchmark.Properties.Test_config_template, benchmark.Properties.Test_suites, configs)
 
 	benchmark.binaryDecorator.baseInstaller.dir = filepath.Join("benchmarktest", ctx.ModuleName())
 	benchmark.binaryDecorator.baseInstaller.dir64 = filepath.Join("benchmarktest64", ctx.ModuleName())
diff --git a/cc/testing.go b/cc/testing.go
index d9be900..df7cb78 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -78,7 +78,7 @@
 
 		cc_library {
 			name: "libc",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			recovery_available: true,
@@ -89,7 +89,7 @@
 		}
 		cc_library {
 			name: "libm",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			recovery_available: true,
@@ -100,7 +100,7 @@
 		}
 		cc_library {
 			name: "libdl",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			recovery_available: true,
@@ -111,7 +111,7 @@
 		}
 		cc_library {
 			name: "libc++_static",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",
@@ -120,7 +120,7 @@
 		}
 		cc_library {
 			name: "libc++",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",
@@ -133,7 +133,7 @@
 		}
 		cc_library {
 			name: "libunwind_llvm",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			stl: "none",
diff --git a/cc/toolchain_library.go b/cc/toolchain_library.go
index b4c51ab..fef4508 100644
--- a/cc/toolchain_library.go
+++ b/cc/toolchain_library.go
@@ -86,7 +86,7 @@
 		fileName := ctx.ModuleName() + staticLibraryExtension
 		outputFile := android.PathForModuleOut(ctx, fileName)
 		buildFlags := flagsToBuilderFlags(flags)
-		library.stripper.strip(ctx, srcPath, outputFile, buildFlags)
+		library.stripper.stripStaticLib(ctx, srcPath, outputFile, buildFlags)
 		return outputFile
 	}
 
diff --git a/cc/util.go b/cc/util.go
index 3862728..2e1bb25 100644
--- a/cc/util.go
+++ b/cc/util.go
@@ -29,10 +29,6 @@
 	return android.JoinWithPrefix(dirs.Strings(), "-I")
 }
 
-func includeFilesToFlags(files android.Paths) string {
-	return android.JoinWithPrefix(files.Strings(), "-include ")
-}
-
 func ldDirsToFlags(dirs []string) string {
 	return android.JoinWithPrefix(dirs, "-L")
 }
diff --git a/cc/vendor_public_library.go b/cc/vendor_public_library.go
index 5738d25..f0de267 100644
--- a/cc/vendor_public_library.go
+++ b/cc/vendor_public_library.go
@@ -125,6 +125,7 @@
 	if !Bool(stub.Properties.Unversioned) {
 		linkerScriptFlag := "-Wl,--version-script," + stub.versionScriptPath.String()
 		flags.LdFlags = append(flags.LdFlags, linkerScriptFlag)
+		flags.LdFlagsDeps = append(flags.LdFlagsDeps, stub.versionScriptPath)
 	}
 	return stub.libraryDecorator.link(ctx, flags, deps, objs)
 }
diff --git a/cc/vndk.go b/cc/vndk.go
index 60a3d78..f9f3764 100644
--- a/cc/vndk.go
+++ b/cc/vndk.go
@@ -467,6 +467,10 @@
 			return
 		}
 
+		if m.Target().NativeBridge == android.NativeBridgeEnabled {
+			return
+		}
+
 		lib, is_lib := m.linker.(*libraryDecorator)
 		prebuilt_lib, is_prebuilt_lib := m.linker.(*prebuiltLibraryLinker)
 
@@ -526,8 +530,15 @@
 
 	var modulePathTxtBuilder strings.Builder
 
+	modulePaths := modulePaths(ctx.Config())
+	var libs []string
+	for lib := range modulePaths {
+		libs = append(libs, lib)
+	}
+	sort.Strings(libs)
+
 	first := true
-	for lib, dir := range modulePaths(ctx.Config()) {
+	for _, lib := range libs {
 		if first {
 			first = false
 		} else {
@@ -535,7 +546,7 @@
 		}
 		modulePathTxtBuilder.WriteString(lib)
 		modulePathTxtBuilder.WriteString(".so ")
-		modulePathTxtBuilder.WriteString(dir)
+		modulePathTxtBuilder.WriteString(modulePaths[lib])
 	}
 
 	ctx.Build(pctx, android.BuildParams{
diff --git a/cmd/multiproduct_kati/main.go b/cmd/multiproduct_kati/main.go
index 330c5dd..1171a65 100644
--- a/cmd/multiproduct_kati/main.go
+++ b/cmd/multiproduct_kati/main.go
@@ -156,10 +156,12 @@
 }
 
 func main() {
-	writer := terminal.NewWriter(terminal.StdioImpl{})
-	defer writer.Finish()
+	stdio := terminal.StdioImpl{}
 
-	log := logger.New(writer)
+	output := terminal.NewStatusOutput(stdio.Stdout(), "",
+		build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD"))
+
+	log := logger.New(output)
 	defer log.Cleanup()
 
 	flag.Parse()
@@ -172,8 +174,7 @@
 
 	stat := &status.Status{}
 	defer stat.Finish()
-	stat.AddOutput(terminal.NewStatusOutput(writer, "",
-		build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD")))
+	stat.AddOutput(output)
 
 	var failures failureCount
 	stat.AddOutput(&failures)
@@ -188,7 +189,7 @@
 		Context: ctx,
 		Logger:  log,
 		Tracer:  trace,
-		Writer:  writer,
+		Writer:  output,
 		Status:  stat,
 	}}
 
@@ -341,7 +342,7 @@
 	} else if failures > 1 {
 		log.Fatalf("%d failures", failures)
 	} else {
-		writer.Print("Success")
+		fmt.Fprintln(output, "Success")
 	}
 }
 
@@ -386,7 +387,7 @@
 		Context: mpctx.Context,
 		Logger:  log,
 		Tracer:  mpctx.Tracer,
-		Writer:  terminal.NewWriter(terminal.NewCustomStdio(nil, f, f)),
+		Writer:  f,
 		Thread:  mpctx.Tracer.NewThread(product),
 		Status:  &status.Status{},
 	}}
@@ -466,3 +467,8 @@
 }
 
 func (f *failureCount) Flush() {}
+
+func (f *failureCount) Write(p []byte) (int, error) {
+	// discard writes
+	return len(p), nil
+}
diff --git a/cmd/soong_ui/main.go b/cmd/soong_ui/main.go
index 5f9bd01..4d59a39 100644
--- a/cmd/soong_ui/main.go
+++ b/cmd/soong_ui/main.go
@@ -61,10 +61,8 @@
 		config: func(ctx build.Context, args ...string) build.Config {
 			return build.NewConfig(ctx, args...)
 		},
-		stdio: func() terminal.StdioInterface {
-			return terminal.StdioImpl{}
-		},
-		run: make,
+		stdio: stdio,
+		run:   make,
 	}, {
 		flag:        "--dumpvar-mode",
 		description: "print the value of the legacy make variable VAR to stdout",
@@ -77,6 +75,12 @@
 		config:      dumpVarConfig,
 		stdio:       customStdio,
 		run:         dumpVars,
+	}, {
+		flag:        "--build-mode",
+		description: "build modules based on the specified build action",
+		config:      buildActionConfig,
+		stdio:       stdio,
+		run:         make,
 	},
 }
 
@@ -109,10 +113,10 @@
 		os.Exit(1)
 	}
 
-	writer := terminal.NewWriter(c.stdio())
-	defer writer.Finish()
+	output := terminal.NewStatusOutput(c.stdio().Stdout(), os.Getenv("NINJA_STATUS"),
+		build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD"))
 
-	log := logger.New(writer)
+	log := logger.New(output)
 	defer log.Cleanup()
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -125,8 +129,7 @@
 
 	stat := &status.Status{}
 	defer stat.Finish()
-	stat.AddOutput(terminal.NewStatusOutput(writer, os.Getenv("NINJA_STATUS"),
-		build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD")))
+	stat.AddOutput(output)
 	stat.AddOutput(trace.StatusTracer())
 
 	build.SetupSignals(log, cancel, func() {
@@ -140,7 +143,7 @@
 		Logger:  log,
 		Metrics: met,
 		Tracer:  trace,
-		Writer:  writer,
+		Writer:  output,
 		Status:  stat,
 	}}
 
@@ -158,8 +161,10 @@
 	trace.SetOutput(filepath.Join(logsDir, "build.trace"))
 	stat.AddOutput(status.NewVerboseLog(log, filepath.Join(logsDir, "verbose.log")))
 	stat.AddOutput(status.NewErrorLog(log, filepath.Join(logsDir, "error.log")))
+	stat.AddOutput(status.NewProtoErrorLog(log, filepath.Join(logsDir, "build_error")))
+	stat.AddOutput(status.NewCriticalPath(log))
 
-	defer met.Dump(filepath.Join(logsDir, "build_metrics"))
+	defer met.Dump(filepath.Join(logsDir, "soong_metrics"))
 
 	if start, ok := os.LookupEnv("TRACE_BEGIN_SOONG"); ok {
 		if !strings.HasSuffix(start, "N") {
@@ -185,13 +190,13 @@
 func dumpVar(ctx build.Context, config build.Config, args []string, _ string) {
 	flags := flag.NewFlagSet("dumpvar", flag.ExitOnError)
 	flags.Usage = func() {
-		fmt.Fprintf(os.Stderr, "usage: %s --dumpvar-mode [--abs] <VAR>\n\n", os.Args[0])
-		fmt.Fprintln(os.Stderr, "In dumpvar mode, print the value of the legacy make variable VAR to stdout")
-		fmt.Fprintln(os.Stderr, "")
+		fmt.Fprintf(ctx.Writer, "usage: %s --dumpvar-mode [--abs] <VAR>\n\n", os.Args[0])
+		fmt.Fprintln(ctx.Writer, "In dumpvar mode, print the value of the legacy make variable VAR to stdout")
+		fmt.Fprintln(ctx.Writer, "")
 
-		fmt.Fprintln(os.Stderr, "'report_config' is a special case that prints the human-readable config banner")
-		fmt.Fprintln(os.Stderr, "from the beginning of the build.")
-		fmt.Fprintln(os.Stderr, "")
+		fmt.Fprintln(ctx.Writer, "'report_config' is a special case that prints the human-readable config banner")
+		fmt.Fprintln(ctx.Writer, "from the beginning of the build.")
+		fmt.Fprintln(ctx.Writer, "")
 		flags.PrintDefaults()
 	}
 	abs := flags.Bool("abs", false, "Print the absolute path of the value")
@@ -235,15 +240,15 @@
 func dumpVars(ctx build.Context, config build.Config, args []string, _ string) {
 	flags := flag.NewFlagSet("dumpvars", flag.ExitOnError)
 	flags.Usage = func() {
-		fmt.Fprintf(os.Stderr, "usage: %s --dumpvars-mode [--vars=\"VAR VAR ...\"]\n\n", os.Args[0])
-		fmt.Fprintln(os.Stderr, "In dumpvars mode, dump the values of one or more legacy make variables, in")
-		fmt.Fprintln(os.Stderr, "shell syntax. The resulting output may be sourced directly into a shell to")
-		fmt.Fprintln(os.Stderr, "set corresponding shell variables.")
-		fmt.Fprintln(os.Stderr, "")
+		fmt.Fprintf(ctx.Writer, "usage: %s --dumpvars-mode [--vars=\"VAR VAR ...\"]\n\n", os.Args[0])
+		fmt.Fprintln(ctx.Writer, "In dumpvars mode, dump the values of one or more legacy make variables, in")
+		fmt.Fprintln(ctx.Writer, "shell syntax. The resulting output may be sourced directly into a shell to")
+		fmt.Fprintln(ctx.Writer, "set corresponding shell variables.")
+		fmt.Fprintln(ctx.Writer, "")
 
-		fmt.Fprintln(os.Stderr, "'report_config' is a special case that dumps a variable containing the")
-		fmt.Fprintln(os.Stderr, "human-readable config banner from the beginning of the build.")
-		fmt.Fprintln(os.Stderr, "")
+		fmt.Fprintln(ctx.Writer, "'report_config' is a special case that dumps a variable containing the")
+		fmt.Fprintln(ctx.Writer, "human-readable config banner from the beginning of the build.")
+		fmt.Fprintln(ctx.Writer, "")
 		flags.PrintDefaults()
 	}
 
@@ -300,6 +305,10 @@
 	}
 }
 
+func stdio() terminal.StdioInterface {
+	return terminal.StdioImpl{}
+}
+
 func customStdio() terminal.StdioInterface {
 	return terminal.NewCustomStdio(os.Stdin, os.Stderr, os.Stderr)
 }
@@ -309,16 +318,98 @@
 	return build.NewConfig(ctx)
 }
 
+func buildActionConfig(ctx build.Context, args ...string) build.Config {
+	flags := flag.NewFlagSet("build-mode", flag.ContinueOnError)
+	flags.Usage = func() {
+		fmt.Fprintf(ctx.Writer, "usage: %s --build-mode --dir=<path> <build action> [<build arg 1> <build arg 2> ...]\n\n", os.Args[0])
+		fmt.Fprintln(ctx.Writer, "In build mode, build the set of modules based on the specified build")
+		fmt.Fprintln(ctx.Writer, "action. The --dir flag is required to determine what is needed to")
+		fmt.Fprintln(ctx.Writer, "build in the source tree based on the build action. See below for")
+		fmt.Fprintln(ctx.Writer, "the list of acceptable build action flags.")
+		fmt.Fprintln(ctx.Writer, "")
+		flags.PrintDefaults()
+	}
+
+	buildActionFlags := []struct {
+		name              string
+		description       string
+		action            build.BuildAction
+		buildDependencies bool
+		set               bool
+	}{{
+		name:              "all-modules",
+		description:       "Build action: build from the top of the source tree.",
+		action:            build.BUILD_MODULES,
+		buildDependencies: true,
+	}, {
+		name:              "modules-in-a-dir-no-deps",
+		description:       "Build action: builds all of the modules in the current directory without their dependencies.",
+		action:            build.BUILD_MODULES_IN_A_DIRECTORY,
+		buildDependencies: false,
+	}, {
+		name:              "modules-in-dirs-no-deps",
+		description:       "Build action: builds all of the modules in the supplied directories without their dependencies.",
+		action:            build.BUILD_MODULES_IN_DIRECTORIES,
+		buildDependencies: false,
+	}, {
+		name:              "modules-in-a-dir",
+		description:       "Build action: builds all of the modules in the current directory and their dependencies.",
+		action:            build.BUILD_MODULES_IN_A_DIRECTORY,
+		buildDependencies: true,
+	}, {
+		name:              "modules-in-dirs",
+		description:       "Build action: builds all of the modules in the supplied directories and their dependencies.",
+		action:            build.BUILD_MODULES_IN_DIRECTORIES,
+		buildDependencies: true,
+	}}
+	for i, flag := range buildActionFlags {
+		flags.BoolVar(&buildActionFlags[i].set, flag.name, false, flag.description)
+	}
+	dir := flags.String("dir", "", "Directory of the executed build command.")
+
+	// Only interested in the first two args which defines the build action and the directory.
+	// The remaining arguments are passed down to the config.
+	const numBuildActionFlags = 2
+	if len(args) < numBuildActionFlags {
+		flags.Usage()
+		ctx.Fatalln("Improper build action arguments.")
+	}
+	flags.Parse(args[0:numBuildActionFlags])
+
+	// The next block of code is to validate that exactly one build action is set and the dir flag
+	// is specified.
+	buildActionCount := 0
+	var buildAction build.BuildAction
+	buildDependency := false
+	for _, flag := range buildActionFlags {
+		if flag.set {
+			buildActionCount++
+			buildAction = flag.action
+			buildDependency = flag.buildDependencies
+		}
+	}
+	if buildActionCount != 1 {
+		ctx.Fatalln("Build action not defined.")
+	}
+	if *dir == "" {
+		ctx.Fatalln("-dir not specified.")
+	}
+
+	// Remove the build action flags from the args as they are not recognized by the config.
+	args = args[numBuildActionFlags:]
+	return build.NewBuildActionConfig(buildAction, *dir, buildDependency, ctx, args...)
+}
+
 func make(ctx build.Context, config build.Config, _ []string, logsDir string) {
 	if config.IsVerbose() {
 		writer := ctx.Writer
-		writer.Print("! The argument `showcommands` is no longer supported.")
-		writer.Print("! Instead, the verbose log is always written to a compressed file in the output dir:")
-		writer.Print("!")
-		writer.Print(fmt.Sprintf("!   gzip -cd %s/verbose.log.gz | less -R", logsDir))
-		writer.Print("!")
-		writer.Print("! Older versions are saved in verbose.log.#.gz files")
-		writer.Print("")
+		fmt.Fprintln(writer, "! The argument `showcommands` is no longer supported.")
+		fmt.Fprintln(writer, "! Instead, the verbose log is always written to a compressed file in the output dir:")
+		fmt.Fprintln(writer, "!")
+		fmt.Fprintf(writer, "!   gzip -cd %s/verbose.log.gz | less -R\n", logsDir)
+		fmt.Fprintln(writer, "!")
+		fmt.Fprintln(writer, "! Older versions are saved in verbose.log.#.gz files")
+		fmt.Fprintln(writer, "")
 		time.Sleep(5 * time.Second)
 	}
 
diff --git a/cmd/zipsync/zipsync.go b/cmd/zipsync/zipsync.go
index ea755f5..a6023d3 100644
--- a/cmd/zipsync/zipsync.go
+++ b/cmd/zipsync/zipsync.go
@@ -30,6 +30,7 @@
 	outputDir  = flag.String("d", "", "output dir")
 	outputFile = flag.String("l", "", "output list file")
 	filter     = flag.String("f", "", "optional filter pattern")
+	zipPrefix  = flag.String("zip-prefix", "", "optional prefix within the zip file to extract, stripping the prefix")
 )
 
 func must(err error) {
@@ -77,6 +78,10 @@
 	var files []string
 	seen := make(map[string]string)
 
+	if *zipPrefix != "" {
+		*zipPrefix = filepath.Clean(*zipPrefix) + "/"
+	}
+
 	for _, input := range inputs {
 		reader, err := zip.OpenReader(input)
 		if err != nil {
@@ -85,23 +90,30 @@
 		defer reader.Close()
 
 		for _, f := range reader.File {
+			name := f.Name
+			if *zipPrefix != "" {
+				if !strings.HasPrefix(name, *zipPrefix) {
+					continue
+				}
+				name = strings.TrimPrefix(name, *zipPrefix)
+			}
 			if *filter != "" {
-				if match, err := filepath.Match(*filter, filepath.Base(f.Name)); err != nil {
+				if match, err := filepath.Match(*filter, filepath.Base(name)); err != nil {
 					log.Fatal(err)
 				} else if !match {
 					continue
 				}
 			}
-			if filepath.IsAbs(f.Name) {
-				log.Fatalf("%q in %q is an absolute path", f.Name, input)
+			if filepath.IsAbs(name) {
+				log.Fatalf("%q in %q is an absolute path", name, input)
 			}
 
-			if prev, exists := seen[f.Name]; exists {
-				log.Fatalf("%q found in both %q and %q", f.Name, prev, input)
+			if prev, exists := seen[name]; exists {
+				log.Fatalf("%q found in both %q and %q", name, prev, input)
 			}
-			seen[f.Name] = input
+			seen[name] = input
 
-			filename := filepath.Join(*outputDir, f.Name)
+			filename := filepath.Join(*outputDir, name)
 			if f.FileInfo().IsDir() {
 				must(os.MkdirAll(filename, f.FileInfo().Mode()))
 			} else {
diff --git a/dexpreopt/config.go b/dexpreopt/config.go
index 5a1bd74..3e32958 100644
--- a/dexpreopt/config.go
+++ b/dexpreopt/config.go
@@ -79,13 +79,11 @@
 	InstructionSetFeatures map[android.ArchType]string // instruction set for each architecture
 
 	// Only used for boot image
-	DirtyImageObjects      android.OptionalPath // path to a dirty-image-objects file
-	PreloadedClasses       android.OptionalPath // path to a preloaded-classes file
-	BootImageProfiles      android.Paths        // path to a boot-image-profile.txt file
-	UseProfileForBootImage bool                 // whether a profile should be used to compile the boot image
-	BootFlags              string               // extra flags to pass to dex2oat for the boot image
-	Dex2oatImageXmx        string               // max heap size for dex2oat for the boot image
-	Dex2oatImageXms        string               // initial heap size for dex2oat for the boot image
+	DirtyImageObjects android.OptionalPath // path to a dirty-image-objects file
+	BootImageProfiles android.Paths        // path to a boot-image-profile.txt file
+	BootFlags         string               // extra flags to pass to dex2oat for the boot image
+	Dex2oatImageXmx   string               // max heap size for dex2oat for the boot image
+	Dex2oatImageXms   string               // initial heap size for dex2oat for the boot image
 
 	Tools Tools // paths to tools possibly used by the generated commands
 }
@@ -121,8 +119,9 @@
 	UsesLibraries                []string
 	LibraryPaths                 map[string]android.Path
 
-	Archs           []android.ArchType
-	DexPreoptImages []android.Path
+	Archs               []android.ArchType
+	DexPreoptImages     []android.Path
+	DexPreoptImagesDeps []android.Paths
 
 	PreoptBootClassPathDexFiles     android.Paths // file paths of boot class path files
 	PreoptBootClassPathDexLocations []string      // virtual locations of boot class path files
@@ -182,7 +181,6 @@
 		// Copies of entries in GlobalConfig that are not constructable without extra parameters.  They will be
 		// used to construct the real value manually below.
 		DirtyImageObjects string
-		PreloadedClasses  string
 		BootImageProfiles []string
 
 		Tools struct {
@@ -205,7 +203,6 @@
 
 	// Construct paths that require a PathContext.
 	config.GlobalConfig.DirtyImageObjects = android.OptionalPathForPath(constructPath(ctx, config.DirtyImageObjects))
-	config.GlobalConfig.PreloadedClasses = android.OptionalPathForPath(constructPath(ctx, config.PreloadedClasses))
 	config.GlobalConfig.BootImageProfiles = constructPaths(ctx, config.BootImageProfiles)
 
 	config.GlobalConfig.Tools.Profman = constructPath(ctx, config.Tools.Profman)
@@ -257,6 +254,9 @@
 	config.ModuleConfig.StripInputPath = constructPath(ctx, config.StripInputPath)
 	config.ModuleConfig.StripOutputPath = constructWritablePath(ctx, config.StripOutputPath)
 
+	// This needs to exist, but dependencies are already handled in Make, so we don't need to pass them through JSON.
+	config.ModuleConfig.DexPreoptImagesDeps = make([]android.Paths, len(config.ModuleConfig.DexPreoptImages))
+
 	return config.ModuleConfig, nil
 }
 
@@ -317,9 +317,7 @@
 		CpuVariant:                         nil,
 		InstructionSetFeatures:             nil,
 		DirtyImageObjects:                  android.OptionalPath{},
-		PreloadedClasses:                   android.OptionalPath{},
 		BootImageProfiles:                  nil,
-		UseProfileForBootImage:             false,
 		BootFlags:                          "",
 		Dex2oatImageXmx:                    "",
 		Dex2oatImageXms:                    "",
diff --git a/dexpreopt/dexpreopt.go b/dexpreopt/dexpreopt.go
index 0be37d0..e02e60f 100644
--- a/dexpreopt/dexpreopt.go
+++ b/dexpreopt/dexpreopt.go
@@ -125,7 +125,8 @@
 
 			for i, arch := range module.Archs {
 				image := module.DexPreoptImages[i]
-				dexpreoptCommand(ctx, global, module, rule, arch, profile, image, appImage, generateDM)
+				imageDeps := module.DexPreoptImagesDeps[i]
+				dexpreoptCommand(ctx, global, module, rule, arch, profile, image, imageDeps, appImage, generateDM)
 			}
 		}
 	}
@@ -190,7 +191,7 @@
 }
 
 func dexpreoptCommand(ctx android.PathContext, global GlobalConfig, module ModuleConfig, rule *android.RuleBuilder,
-	arch android.ArchType, profile, bootImage android.Path, appImage, generateDM bool) {
+	arch android.ArchType, profile, bootImage android.Path, bootImageDeps android.Paths, appImage, generateDM bool) {
 
 	// HACK: make soname in Soong-generated .odex files match Make.
 	base := filepath.Base(module.DexLocation)
@@ -353,7 +354,7 @@
 		Flag("--runtime-arg").FlagWithList("-Xbootclasspath-locations:", module.PreoptBootClassPathDexLocations, ":").
 		Flag("${class_loader_context_arg}").
 		Flag("${stored_class_loader_context_arg}").
-		FlagWithArg("--boot-image=", bootImageLocation).Implicit(bootImage).
+		FlagWithArg("--boot-image=", bootImageLocation).Implicits(bootImageDeps).
 		FlagWithInput("--dex-file=", module.DexPath).
 		FlagWithArg("--dex-location=", dexLocationArg).
 		FlagWithOutput("--oat-file=", odexPath).ImplicitOutput(vdexPath).
diff --git a/dexpreopt/dexpreopt_test.go b/dexpreopt/dexpreopt_test.go
index 0402f87..7f1fe42 100644
--- a/dexpreopt/dexpreopt_test.go
+++ b/dexpreopt/dexpreopt_test.go
@@ -38,6 +38,7 @@
 		LibraryPaths:                    nil,
 		Archs:                           []android.ArchType{android.Arm},
 		DexPreoptImages:                 android.Paths{android.PathForTesting("system/framework/arm/boot.art")},
+		DexPreoptImagesDeps:             []android.Paths{android.Paths{}},
 		PreoptBootClassPathDexFiles:     nil,
 		PreoptBootClassPathDexLocations: nil,
 		PreoptExtractedApk:              false,
diff --git a/finder/finder_test.go b/finder/finder_test.go
index 29711fc..f6d0aa9 100644
--- a/finder/finder_test.go
+++ b/finder/finder_test.go
@@ -891,8 +891,8 @@
 			IncludeFiles: []string{"findme.txt"},
 		},
 	)
-	foundPaths := finder.FindNamedAt("/tmp", "findme.txt")
 	filesystem.Clock.Tick()
+	foundPaths := finder.FindNamedAt("/tmp", "findme.txt")
 	finder.Shutdown()
 	// check the response of the first finder
 	assertSameResponse(t, foundPaths, []string{"/tmp/a/findme.txt"})
@@ -1522,8 +1522,8 @@
 			IncludeFiles: []string{"hi.txt"},
 		},
 	)
-	foundPaths := finder.FindAll()
 	filesystem.Clock.Tick()
+	foundPaths := finder.FindAll()
 	finder.Shutdown()
 	// check results
 	assertSameResponse(t, foundPaths, []string{"/tmp/a/hi.txt"})
@@ -1583,8 +1583,8 @@
 			IncludeFiles: []string{"hi.txt"},
 		},
 	)
-	foundPaths := finder.FindAll()
 	filesystem.Clock.Tick()
+	foundPaths := finder.FindAll()
 	finder.Shutdown()
 	allPaths := []string{"/tmp/hi.txt", "/tmp/a/hi.txt", "/tmp/a/a/hi.txt", "/tmp/b/hi.txt"}
 	// check results
@@ -1629,8 +1629,8 @@
 			IncludeFiles: []string{"hi.txt"},
 		},
 	)
-	foundPaths := finder.FindAll()
 	filesystem.Clock.Tick()
+	foundPaths := finder.FindAll()
 	finder.Shutdown()
 	// check results
 	assertSameResponse(t, foundPaths, []string{"/tmp/hi.txt"})
@@ -1650,8 +1650,8 @@
 			IncludeFiles: []string{"hi.txt"},
 		},
 	)
-	foundPaths := finder.FindAll()
 	filesystem.Clock.Tick()
+	foundPaths := finder.FindAll()
 	finder.Shutdown()
 	// check results
 	assertSameResponse(t, foundPaths, []string{"/tmp/a/hi.txt"})
diff --git a/genrule/genrule.go b/genrule/genrule.go
index 87e6747..b0657ff 100644
--- a/genrule/genrule.go
+++ b/genrule/genrule.go
@@ -101,6 +101,7 @@
 type Module struct {
 	android.ModuleBase
 	android.DefaultableModuleBase
+	android.ApexModuleBase
 
 	// For other packages to make their own genrules with extra
 	// properties
@@ -582,9 +583,6 @@
 	android.DefaultsModuleBase
 }
 
-func (*Defaults) GenerateAndroidBuildActions(ctx android.ModuleContext) {
-}
-
 func defaultsFactory() android.Module {
 	return DefaultsFactory()
 }
diff --git a/jar/Android.bp b/jar/Android.bp
index 6c2e60e..2563474 100644
--- a/jar/Android.bp
+++ b/jar/Android.bp
@@ -18,8 +18,10 @@
     srcs: [
         "jar.go",
     ],
+    testSrcs: [
+        "jar_test.go",
+    ],
     deps: [
         "android-archive-zip",
     ],
 }
-
diff --git a/jar/jar.go b/jar/jar.go
index fa0e693..a8f06a4 100644
--- a/jar/jar.go
+++ b/jar/jar.go
@@ -17,9 +17,12 @@
 import (
 	"bytes"
 	"fmt"
+	"io"
 	"os"
 	"strings"
+	"text/scanner"
 	"time"
+	"unicode"
 
 	"android/soong/third_party/zip"
 )
@@ -112,3 +115,111 @@
 
 	return finalBytes, nil
 }
+
+var javaIgnorableIdentifier = &unicode.RangeTable{
+	R16: []unicode.Range16{
+		{0x00, 0x08, 1},
+		{0x0e, 0x1b, 1},
+		{0x7f, 0x9f, 1},
+	},
+	LatinOffset: 3,
+}
+
+func javaIdentRune(ch rune, i int) bool {
+	if unicode.IsLetter(ch) {
+		return true
+	}
+	if unicode.IsDigit(ch) && i > 0 {
+		return true
+	}
+
+	if unicode.In(ch,
+		unicode.Nl, // letter number
+		unicode.Sc, // currency symbol
+		unicode.Pc, // connecting punctuation
+	) {
+		return true
+	}
+
+	if unicode.In(ch,
+		unicode.Cf, // format
+		unicode.Mc, // combining mark
+		unicode.Mn, // non-spacing mark
+		javaIgnorableIdentifier,
+	) && i > 0 {
+		return true
+	}
+
+	return false
+}
+
+// JavaPackage parses the package out of a java source file by looking for the package statement, or the first valid
+// non-package statement, in which case it returns an empty string for the package.
+func JavaPackage(r io.Reader, src string) (string, error) {
+	var s scanner.Scanner
+	var sErr error
+
+	s.Init(r)
+	s.Filename = src
+	s.Error = func(s *scanner.Scanner, msg string) {
+		sErr = fmt.Errorf("error parsing %q: %s", src, msg)
+	}
+	s.IsIdentRune = javaIdentRune
+
+	tok := s.Scan()
+	if sErr != nil {
+		return "", sErr
+	}
+	if tok == scanner.Ident {
+		switch s.TokenText() {
+		case "package":
+		// Nothing
+		case "import":
+			// File has no package statement, first keyword is an import
+			return "", nil
+		case "class", "enum", "interface":
+			// File has no package statement, first keyword is a type declaration
+			return "", nil
+		case "public", "protected", "private", "abstract", "static", "final", "strictfp":
+			// File has no package statement, first keyword is a modifier
+			return "", nil
+		case "module", "open":
+			// File has no package statement, first keyword is a module declaration
+			return "", nil
+		default:
+			return "", fmt.Errorf(`expected first token of java file to be "package", got %q`, s.TokenText())
+		}
+	} else if tok == '@' {
+		// File has no package statement, first token is an annotation
+		return "", nil
+	} else if tok == scanner.EOF {
+		// File no package statement, it has no non-whitespace non-comment tokens
+		return "", nil
+	} else {
+		return "", fmt.Errorf(`expected first token of java file to be "package", got %q`, s.TokenText())
+	}
+
+	var pkg string
+	for {
+		tok = s.Scan()
+		if sErr != nil {
+			return "", sErr
+		}
+		if tok != scanner.Ident {
+			return "", fmt.Errorf(`expected "package <package>;", got "package %s%s"`, pkg, s.TokenText())
+		}
+		pkg += s.TokenText()
+
+		tok = s.Scan()
+		if sErr != nil {
+			return "", sErr
+		}
+		if tok == ';' {
+			return pkg, nil
+		} else if tok == '.' {
+			pkg += "."
+		} else {
+			return "", fmt.Errorf(`expected "package <package>;", got "package %s%s"`, pkg, s.TokenText())
+		}
+	}
+}
diff --git a/jar/jar_test.go b/jar/jar_test.go
new file mode 100644
index 0000000..c92011e
--- /dev/null
+++ b/jar/jar_test.go
@@ -0,0 +1,182 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jar
+
+import (
+	"bytes"
+	"io"
+	"testing"
+)
+
+func TestGetJavaPackage(t *testing.T) {
+	type args struct {
+		r   io.Reader
+		src string
+	}
+	tests := []struct {
+		name    string
+		in      string
+		want    string
+		wantErr bool
+	}{
+		{
+			name: "simple",
+			in:   "package foo.bar;",
+			want: "foo.bar",
+		},
+		{
+			name: "comment",
+			in:   "/* test */\npackage foo.bar;",
+			want: "foo.bar",
+		},
+		{
+			name: "no package",
+			in:   "import foo.bar;",
+			want: "",
+		},
+		{
+			name:    "missing semicolon error",
+			in:      "package foo.bar",
+			wantErr: true,
+		},
+		{
+			name:    "parser error",
+			in:      "/*",
+			wantErr: true,
+		},
+		{
+			name:    "parser ident error",
+			in:      "package 0foo.bar;",
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			buf := bytes.NewBufferString(tt.in)
+			got, err := JavaPackage(buf, "<test>")
+			if (err != nil) != tt.wantErr {
+				t.Errorf("JavaPackage() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("JavaPackage() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_javaIdentRune(t *testing.T) {
+	// runes that should be valid anywhere in an identifier
+	validAnywhere := []rune{
+		// letters, $, _
+		'a',
+		'A',
+		'$',
+		'_',
+
+		// assorted unicode
+		'𐐀',
+		'𐐨',
+		'ǅ',
+		'ῼ',
+		'ʰ',
+		'ﾟ',
+		'ƻ',
+		'㡢',
+		'￦',
+		'＿',
+		'Ⅰ',
+		'𐍊',
+	}
+
+	// runes that should be invalid as the first rune in an identifier, but valid anywhere else
+	validAfterFirst := []rune{
+		// digits
+		'0',
+
+		// assorted unicode
+		'᥍',
+		'𝟎',
+		'ྂ',
+		'𝆀',
+
+		// control characters
+		'\x00',
+		'\b',
+		'\u000e',
+		'\u001b',
+		'\u007f',
+		'\u009f',
+		'\u00ad',
+		0xE007F,
+
+		// zero width space
+		'\u200b',
+	}
+
+	// runes that should never be valid in an identifier
+	invalid := []rune{
+		';',
+		0x110000,
+	}
+
+	validFirst := validAnywhere
+	invalidFirst := append(validAfterFirst, invalid...)
+	validPart := append(validAnywhere, validAfterFirst...)
+	invalidPart := invalid
+
+	check := func(t *testing.T, ch rune, i int, want bool) {
+		t.Helper()
+		if got := javaIdentRune(ch, i); got != want {
+			t.Errorf("javaIdentRune() = %v, want %v", got, want)
+		}
+	}
+
+	t.Run("first", func(t *testing.T) {
+		t.Run("valid", func(t *testing.T) {
+			for _, ch := range validFirst {
+				t.Run(string(ch), func(t *testing.T) {
+					check(t, ch, 0, true)
+				})
+			}
+		})
+
+		t.Run("invalid", func(t *testing.T) {
+			for _, ch := range invalidFirst {
+				t.Run(string(ch), func(t *testing.T) {
+					check(t, ch, 0, false)
+				})
+			}
+		})
+	})
+
+	t.Run("part", func(t *testing.T) {
+		t.Run("valid", func(t *testing.T) {
+			for _, ch := range validPart {
+				t.Run(string(ch), func(t *testing.T) {
+					check(t, ch, 1, true)
+				})
+			}
+		})
+
+		t.Run("invalid", func(t *testing.T) {
+			for _, ch := range invalidPart {
+				t.Run(string(ch), func(t *testing.T) {
+					check(t, ch, 1, false)
+				})
+			}
+		})
+	})
+}
diff --git a/java/aapt2.go b/java/aapt2.go
index bcc8e97..f0eb99c 100644
--- a/java/aapt2.go
+++ b/java/aapt2.go
@@ -55,12 +55,14 @@
 
 var aapt2CompileRule = pctx.AndroidStaticRule("aapt2Compile",
 	blueprint.RuleParams{
-		Command:     `${config.Aapt2Cmd} compile -o $outDir $cFlags --legacy $in`,
+		Command:     `${config.Aapt2Cmd} compile -o $outDir $cFlags $in`,
 		CommandDeps: []string{"${config.Aapt2Cmd}"},
 	},
 	"outDir", "cFlags")
 
-func aapt2Compile(ctx android.ModuleContext, dir android.Path, paths android.Paths) android.WritablePaths {
+func aapt2Compile(ctx android.ModuleContext, dir android.Path, paths android.Paths,
+	flags []string) android.WritablePaths {
+
 	shards := shardPaths(paths, AAPT2_SHARD_SIZE)
 
 	ret := make(android.WritablePaths, 0, len(paths))
@@ -81,9 +83,7 @@
 			Outputs:     outPaths,
 			Args: map[string]string{
 				"outDir": android.PathForModuleOut(ctx, "aapt2", dir.String()).String(),
-				// Always set --pseudo-localize, it will be stripped out later for release
-				// builds that don't want it.
-				"cFlags": "--pseudo-localize",
+				"cFlags": strings.Join(flags, " "),
 			},
 		})
 	}
@@ -94,42 +94,31 @@
 	return ret
 }
 
-func aapt2CompileDirs(ctx android.ModuleContext, flata android.WritablePath, dirs android.Paths, deps android.Paths) {
-	ctx.Build(pctx, android.BuildParams{
-		Rule:        aapt2CompileRule,
-		Description: "aapt2 compile dirs",
-		Implicits:   deps,
-		Output:      flata,
-		Args: map[string]string{
-			"outDir": flata.String(),
-			// Always set --pseudo-localize, it will be stripped out later for release
-			// builds that don't want it.
-			"cFlags": "--pseudo-localize " + android.JoinWithPrefix(dirs.Strings(), "--dir "),
-		},
-	})
-}
-
 var aapt2CompileZipRule = pctx.AndroidStaticRule("aapt2CompileZip",
 	blueprint.RuleParams{
-		Command: `${config.ZipSyncCmd} -d $resZipDir $in && ` +
-			`${config.Aapt2Cmd} compile -o $out $cFlags --legacy --dir $resZipDir`,
+		Command: `${config.ZipSyncCmd} -d $resZipDir $zipSyncFlags $in && ` +
+			`${config.Aapt2Cmd} compile -o $out $cFlags --dir $resZipDir`,
 		CommandDeps: []string{
 			"${config.Aapt2Cmd}",
 			"${config.ZipSyncCmd}",
 		},
-	}, "cFlags", "resZipDir")
+	}, "cFlags", "resZipDir", "zipSyncFlags")
 
-func aapt2CompileZip(ctx android.ModuleContext, flata android.WritablePath, zip android.Path) {
+func aapt2CompileZip(ctx android.ModuleContext, flata android.WritablePath, zip android.Path, zipPrefix string,
+	flags []string) {
+
+	if zipPrefix != "" {
+		zipPrefix = "--zip-prefix " + zipPrefix
+	}
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        aapt2CompileZipRule,
 		Description: "aapt2 compile zip",
 		Input:       zip,
 		Output:      flata,
 		Args: map[string]string{
-			// Always set --pseudo-localize, it will be stripped out later for release
-			// builds that don't want it.
-			"cFlags":    "--pseudo-localize",
-			"resZipDir": android.PathForModuleOut(ctx, "aapt2", "reszip", flata.Base()).String(),
+			"cFlags":       strings.Join(flags, " "),
+			"resZipDir":    android.PathForModuleOut(ctx, "aapt2", "reszip", flata.Base()).String(),
+			"zipSyncFlags": zipPrefix,
 		},
 	})
 }
diff --git a/java/aar.go b/java/aar.go
index 65a7c2a..c9306de 100644
--- a/java/aar.go
+++ b/java/aar.go
@@ -17,6 +17,7 @@
 import (
 	"android/soong/android"
 	"fmt"
+	"path/filepath"
 	"strings"
 
 	"github.com/google/blueprint"
@@ -80,11 +81,13 @@
 	rTxt                    android.Path
 	extraAaptPackagesFile   android.Path
 	mergedManifestFile      android.Path
+	noticeFile              android.OptionalPath
 	isLibrary               bool
 	useEmbeddedNativeLibs   bool
 	useEmbeddedDex          bool
 	usesNonSdkApis          bool
 	sdkLibraries            []string
+	hasNoCode               bool
 
 	splitNames []string
 	splits     []split
@@ -110,8 +113,9 @@
 	return a.transitiveManifestPaths
 }
 
-func (a *aapt) aapt2Flags(ctx android.ModuleContext, sdkContext sdkContext, manifestPath android.Path) (flags []string,
-	deps android.Paths, resDirs, overlayDirs []globbedResourceDir, rroDirs []rroDir, resZips android.Paths) {
+func (a *aapt) aapt2Flags(ctx android.ModuleContext, sdkContext sdkContext,
+	manifestPath android.Path) (compileFlags, linkFlags []string, linkDeps android.Paths,
+	resDirs, overlayDirs []globbedResourceDir, rroDirs []rroDir, resZips android.Paths) {
 
 	hasVersionCode := false
 	hasVersionName := false
@@ -123,8 +127,6 @@
 		}
 	}
 
-	var linkFlags []string
-
 	// Flags specified in Android.bp
 	linkFlags = append(linkFlags, a.aaptProperties.Aaptflags...)
 
@@ -135,8 +137,6 @@
 	resourceDirs := android.PathsWithOptionalDefaultForModuleSrc(ctx, a.aaptProperties.Resource_dirs, "res")
 	resourceZips := android.PathsForModuleSrc(ctx, a.aaptProperties.Resource_zips)
 
-	var linkDeps android.Paths
-
 	// Glob directories into lists of paths
 	for _, dir := range resourceDirs {
 		resDirs = append(resDirs, globbedResourceDir{
@@ -153,10 +153,16 @@
 		assetFiles = append(assetFiles, androidResourceGlob(ctx, dir)...)
 	}
 
+	assetDirStrings := assetDirs.Strings()
+	if a.noticeFile.Valid() {
+		assetDirStrings = append(assetDirStrings, filepath.Dir(a.noticeFile.Path().String()))
+		assetFiles = append(assetFiles, a.noticeFile.Path())
+	}
+
 	linkFlags = append(linkFlags, "--manifest "+manifestPath.String())
 	linkDeps = append(linkDeps, manifestPath)
 
-	linkFlags = append(linkFlags, android.JoinWithPrefix(assetDirs.Strings(), "-A "))
+	linkFlags = append(linkFlags, android.JoinWithPrefix(assetDirStrings, "-A "))
 	linkDeps = append(linkDeps, assetFiles...)
 
 	// SDK version flags
@@ -184,11 +190,16 @@
 		linkFlags = append(linkFlags, "--version-name ", versionName)
 	}
 
-	return linkFlags, linkDeps, resDirs, overlayDirs, rroDirs, resourceZips
+	linkFlags, compileFlags = android.FilterList(linkFlags, []string{"--legacy"})
+
+	// Always set --pseudo-localize, it will be stripped out later for release
+	// builds that don't want it.
+	compileFlags = append(compileFlags, "--pseudo-localize")
+
+	return compileFlags, linkFlags, linkDeps, resDirs, overlayDirs, rroDirs, resourceZips
 }
 
-func (a *aapt) deps(ctx android.BottomUpMutatorContext, sdkContext sdkContext) {
-	sdkDep := decodeSdkDep(ctx, sdkContext)
+func (a *aapt) deps(ctx android.BottomUpMutatorContext, sdkDep sdkDep) {
 	if sdkDep.frameworkResModule != "" {
 		ctx.AddVariationDependencies(nil, frameworkResTag, sdkDep.frameworkResModule)
 	}
@@ -204,7 +215,7 @@
 	manifestSrcPath := android.PathForModuleSrc(ctx, manifestFile)
 
 	manifestPath := manifestFixer(ctx, manifestSrcPath, sdkContext, sdkLibraries,
-		a.isLibrary, a.useEmbeddedNativeLibs, a.usesNonSdkApis, a.useEmbeddedDex)
+		a.isLibrary, a.useEmbeddedNativeLibs, a.usesNonSdkApis, a.useEmbeddedDex, a.hasNoCode)
 
 	a.transitiveManifestPaths = append(android.Paths{manifestPath}, transitiveStaticLibManifests...)
 
@@ -220,7 +231,7 @@
 		a.mergedManifestFile = manifestPath
 	}
 
-	linkFlags, linkDeps, resDirs, overlayDirs, rroDirs, resZips := a.aapt2Flags(ctx, sdkContext, manifestPath)
+	compileFlags, linkFlags, linkDeps, resDirs, overlayDirs, rroDirs, resZips := a.aapt2Flags(ctx, sdkContext, manifestPath)
 
 	rroDirs = append(rroDirs, staticRRODirs...)
 	linkFlags = append(linkFlags, libFlags...)
@@ -239,12 +250,12 @@
 
 	var compiledResDirs []android.Paths
 	for _, dir := range resDirs {
-		compiledResDirs = append(compiledResDirs, aapt2Compile(ctx, dir.dir, dir.files).Paths())
+		compiledResDirs = append(compiledResDirs, aapt2Compile(ctx, dir.dir, dir.files, compileFlags).Paths())
 	}
 
 	for i, zip := range resZips {
 		flata := android.PathForModuleOut(ctx, fmt.Sprintf("reszip.%d.flata", i))
-		aapt2CompileZip(ctx, flata, zip)
+		aapt2CompileZip(ctx, flata, zip, "", compileFlags)
 		compiledResDirs = append(compiledResDirs, android.Paths{flata})
 	}
 
@@ -273,7 +284,7 @@
 	}
 
 	for _, dir := range overlayDirs {
-		compiledOverlay = append(compiledOverlay, aapt2Compile(ctx, dir.dir, dir.files).Paths()...)
+		compiledOverlay = append(compiledOverlay, aapt2Compile(ctx, dir.dir, dir.files, compileFlags).Paths()...)
 	}
 
 	var splitPackages android.WritablePaths
@@ -400,8 +411,9 @@
 
 func (a *AndroidLibrary) DepsMutator(ctx android.BottomUpMutatorContext) {
 	a.Module.deps(ctx)
-	if !Bool(a.properties.No_framework_libs) && !Bool(a.properties.No_standard_libs) {
-		a.aapt.deps(ctx, sdkContext(a))
+	sdkDep := decodeSdkDep(ctx, sdkContext(a))
+	if sdkDep.hasFrameworkLibs() {
+		a.aapt.deps(ctx, sdkDep)
 	}
 }
 
@@ -555,13 +567,13 @@
 }
 
 // Unzip an AAR into its constituent files and directories.  Any files in Outputs that don't exist in the AAR will be
-// touched to create an empty file, and any directories in $expectedDirs will be created.
+// touched to create an empty file. The res directory is not extracted, as it will be extracted in its own rule.
 var unzipAAR = pctx.AndroidStaticRule("unzipAAR",
 	blueprint.RuleParams{
-		Command: `rm -rf $outDir && mkdir -p $outDir $expectedDirs && ` +
-			`unzip -qo -d $outDir $in && touch $out`,
+		Command: `rm -rf $outDir && mkdir -p $outDir && ` +
+			`unzip -qo -d $outDir $in && rm -rf $outDir/res && touch $out`,
 	},
-	"expectedDirs", "outDir")
+	"outDir")
 
 func (a *AARImport) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	if len(a.properties.Aars) != 1 {
@@ -579,7 +591,6 @@
 	}
 
 	extractedAARDir := android.PathForModuleOut(ctx, "aar")
-	extractedResDir := extractedAARDir.Join(ctx, "res")
 	a.classpathFile = extractedAARDir.Join(ctx, "classes.jar")
 	a.proguardFlags = extractedAARDir.Join(ctx, "proguard.txt")
 	a.manifest = extractedAARDir.Join(ctx, "AndroidManifest.xml")
@@ -590,16 +601,16 @@
 		Outputs:     android.WritablePaths{a.classpathFile, a.proguardFlags, a.manifest},
 		Description: "unzip AAR",
 		Args: map[string]string{
-			"expectedDirs": extractedResDir.String(),
-			"outDir":       extractedAARDir.String(),
+			"outDir": extractedAARDir.String(),
 		},
 	})
 
+	// Always set --pseudo-localize, it will be stripped out later for release
+	// builds that don't want it.
+	compileFlags := []string{"--pseudo-localize"}
 	compiledResDir := android.PathForModuleOut(ctx, "flat-res")
-	aaptCompileDeps := android.Paths{a.classpathFile}
-	aaptCompileDirs := android.Paths{extractedResDir}
 	flata := compiledResDir.Join(ctx, "gen_res.flata")
-	aapt2CompileDirs(ctx, flata, aaptCompileDirs, aaptCompileDeps)
+	aapt2CompileZip(ctx, flata, aar, "res", compileFlags)
 
 	a.exportPackage = android.PathForModuleOut(ctx, "package-res.apk")
 	srcJar := android.PathForModuleGen(ctx, "R.jar")
diff --git a/java/android_manifest.go b/java/android_manifest.go
index b5921be..021883e 100644
--- a/java/android_manifest.go
+++ b/java/android_manifest.go
@@ -53,7 +53,7 @@
 
 // Uses manifest_fixer.py to inject minSdkVersion, etc. into an AndroidManifest.xml
 func manifestFixer(ctx android.ModuleContext, manifest android.Path, sdkContext sdkContext, sdkLibraries []string,
-	isLibrary, useEmbeddedNativeLibs, usesNonSdkApis, useEmbeddedDex bool) android.Path {
+	isLibrary, useEmbeddedNativeLibs, usesNonSdkApis, useEmbeddedDex, hasNoCode bool) android.Path {
 
 	var args []string
 	if isLibrary {
@@ -87,6 +87,10 @@
 		}
 	}
 
+	if hasNoCode {
+		args = append(args, "--has-no-code")
+	}
+
 	var deps android.Paths
 	targetSdkVersion := sdkVersionOrDefault(ctx, sdkContext.targetSdkVersion())
 	if targetSdkVersion == ctx.Config().PlatformSdkCodename() &&
diff --git a/java/androidmk.go b/java/androidmk.go
index 5491b3e..39c2d13 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -97,14 +97,6 @@
 				if library.proguardDictionary != nil {
 					fmt.Fprintln(w, "LOCAL_SOONG_PROGUARD_DICT :=", library.proguardDictionary.String())
 				}
-
-				// Temporary hack: export sources used to compile framework.jar to Make
-				// to be used for droiddoc
-				// TODO(ccross): remove this once droiddoc is in soong
-				if (library.Name() == "framework") || (library.Name() == "framework-annotation-proc") {
-					fmt.Fprintln(w, "SOONG_FRAMEWORK_SRCS :=", strings.Join(library.compiledJavaSrcs.Strings(), " "))
-					fmt.Fprintln(w, "SOONG_FRAMEWORK_SRCJARS :=", strings.Join(library.compiledSrcJars.Strings(), " "))
-				}
 			},
 		},
 		Custom: func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
diff --git a/java/app.go b/java/app.go
index 2d817fe..f58b0f8 100644
--- a/java/app.go
+++ b/java/app.go
@@ -19,6 +19,7 @@
 import (
 	"path/filepath"
 	"reflect"
+	"sort"
 	"strings"
 
 	"github.com/google/blueprint"
@@ -103,6 +104,10 @@
 	// Use_embedded_native_libs still selects whether they are stored uncompressed and aligned or compressed.
 	// True for android_test* modules.
 	AlwaysPackageNativeLibs bool `blueprint:"mutated"`
+
+	// If set, find and merge all NOTICE files that this module and its dependencies have and store
+	// it in the APK as an asset.
+	Embed_notices *bool
 }
 
 // android_app properties that can be overridden by override_android_app
@@ -159,8 +164,9 @@
 		ctx.PropertyErrorf("stl", "sdk_version must be set in order to use c++_shared")
 	}
 
-	if !Bool(a.properties.No_framework_libs) && !Bool(a.properties.No_standard_libs) {
-		a.aapt.deps(ctx, sdkContext(a))
+	sdkDep := decodeSdkDep(ctx, sdkContext(a))
+	if sdkDep.hasFrameworkLibs() {
+		a.aapt.deps(ctx, sdkDep)
 	}
 
 	embedJni := a.shouldEmbedJnis(ctx)
@@ -175,12 +181,12 @@
 		ctx.AddFarVariationDependencies(variation, tag, a.appProperties.Jni_libs...)
 		if String(a.appProperties.Stl) == "c++_shared" {
 			if embedJni {
-				ctx.AddFarVariationDependencies(variation, tag, "libc++")
+				ctx.AddFarVariationDependencies(variation, tag, "ndk_libc++_shared")
 			}
 		}
 	}
 
-	a.usesLibrary.deps(ctx, Bool(a.properties.No_framework_libs))
+	a.usesLibrary.deps(ctx, sdkDep.hasFrameworkLibs())
 }
 
 func (a *AndroidApp) OverridablePropertiesDepsMutator(ctx android.BottomUpMutatorContext) {
@@ -223,15 +229,16 @@
 		return true
 	}
 
-	if ctx.Config().UnbundledBuild() {
-		return false
-	}
-
-	// Uncompress dex in APKs of privileged apps
+	// Uncompress dex in APKs of privileged apps (even for unbundled builds, they may
+	// be preinstalled as prebuilts).
 	if ctx.Config().UncompressPrivAppDex() && Bool(a.appProperties.Privileged) {
 		return true
 	}
 
+	if ctx.Config().UnbundledBuild() {
+		return false
+	}
+
 	return shouldUncompressDex(ctx, &a.dexpreopter)
 }
 
@@ -243,6 +250,9 @@
 func (a *AndroidApp) aaptBuildActions(ctx android.ModuleContext) {
 	a.aapt.usesNonSdkApis = Bool(a.Module.deviceProperties.Platform_apis)
 
+	// Ask manifest_fixer to add or update the application element indicating this app has no code.
+	a.aapt.hasNoCode = !a.hasCode(ctx)
+
 	aaptLinkFlags := []string{}
 
 	// Add TARGET_AAPT_CHARACTERISTICS values to AAPT link flags if they exist and --product flags were not provided.
@@ -347,6 +357,54 @@
 	return jniJarFile
 }
 
+func (a *AndroidApp) noticeBuildActions(ctx android.ModuleContext, installDir android.OutputPath) android.OptionalPath {
+	if !Bool(a.appProperties.Embed_notices) && !ctx.Config().IsEnvTrue("ALWAYS_EMBED_NOTICES") {
+		return android.OptionalPath{}
+	}
+
+	// Collect NOTICE files from all dependencies.
+	seenModules := make(map[android.Module]bool)
+	noticePathSet := make(map[android.Path]bool)
+
+	ctx.WalkDeps(func(child android.Module, parent android.Module) bool {
+		// Have we already seen this?
+		if _, ok := seenModules[child]; ok {
+			return false
+		}
+		seenModules[child] = true
+
+		// Skip host modules.
+		if child.Target().Os.Class == android.Host || child.Target().Os.Class == android.HostCross {
+			return false
+		}
+
+		path := child.(android.Module).NoticeFile()
+		if path.Valid() {
+			noticePathSet[path.Path()] = true
+		}
+		return true
+	})
+
+	// If the app has one, add it too.
+	if a.NoticeFile().Valid() {
+		noticePathSet[a.NoticeFile().Path()] = true
+	}
+
+	if len(noticePathSet) == 0 {
+		return android.OptionalPath{}
+	}
+	var noticePaths []android.Path
+	for path := range noticePathSet {
+		noticePaths = append(noticePaths, path)
+	}
+	sort.Slice(noticePaths, func(i, j int) bool {
+		return noticePaths[i].String() < noticePaths[j].String()
+	})
+	noticeFile := android.BuildNoticeOutput(ctx, installDir, a.installApkName+".apk", noticePaths)
+
+	return android.OptionalPathForPath(noticeFile)
+}
+
 // Reads and prepends a main cert from the default cert dir if it hasn't been set already, i.e. it
 // isn't a cert module reference. Also checks and enforces system cert restriction if applicable.
 func processMainCert(m android.ModuleBase, certPropValue string, certificates []Certificate, ctx android.ModuleContext) []Certificate {
@@ -387,6 +445,18 @@
 	// Check if the install APK name needs to be overridden.
 	a.installApkName = ctx.DeviceConfig().OverridePackageNameFor(a.Name())
 
+	var installDir android.OutputPath
+	if ctx.ModuleName() == "framework-res" {
+		// framework-res.apk is installed as system/framework/framework-res.apk
+		installDir = android.PathForModuleInstall(ctx, "framework")
+	} else if Bool(a.appProperties.Privileged) {
+		installDir = android.PathForModuleInstall(ctx, "priv-app", a.installApkName)
+	} else {
+		installDir = android.PathForModuleInstall(ctx, "app", a.installApkName)
+	}
+
+	a.aapt.noticeFile = a.noticeBuildActions(ctx, installDir)
+
 	// Process all building blocks, from AAPT to certificates.
 	a.aaptBuildActions(ctx)
 
@@ -428,16 +498,6 @@
 	a.bundleFile = bundleFile
 
 	// Install the app package.
-	var installDir android.OutputPath
-	if ctx.ModuleName() == "framework-res" {
-		// framework-res.apk is installed as system/framework/framework-res.apk
-		installDir = android.PathForModuleInstall(ctx, "framework")
-	} else if Bool(a.appProperties.Privileged) {
-		installDir = android.PathForModuleInstall(ctx, "priv-app", a.installApkName)
-	} else {
-		installDir = android.PathForModuleInstall(ctx, "app", a.installApkName)
-	}
-
 	ctx.InstallFile(installDir, a.installApkName+".apk", a.outputFile)
 	for _, split := range a.aapt.splits {
 		ctx.InstallFile(installDir, a.installApkName+"_"+split.suffix+".apk", split.path)
@@ -479,7 +539,7 @@
 	return jniLibs, certificates
 }
 
-func (a *AndroidApp) getCertString(ctx android.BaseContext) string {
+func (a *AndroidApp) getCertString(ctx android.BaseModuleContext) string {
 	certificate, overridden := ctx.DeviceConfig().OverrideCertificateFor(ctx.ModuleName())
 	if overridden {
 		return ":" + certificate
@@ -780,7 +840,7 @@
 		ctx.AddDependency(ctx.Module(), certificateTag, cert)
 	}
 
-	a.usesLibrary.deps(ctx, false)
+	a.usesLibrary.deps(ctx, true)
 }
 
 func (a *AndroidAppImport) uncompressEmbeddedJniLibs(
@@ -934,17 +994,22 @@
 	usesLibraryProperties UsesLibraryProperties
 }
 
-func (u *usesLibrary) deps(ctx android.BottomUpMutatorContext, noFrameworkLibs bool) {
-	ctx.AddVariationDependencies(nil, usesLibTag, u.usesLibraryProperties.Uses_libs...)
-	ctx.AddVariationDependencies(nil, usesLibTag, u.presentOptionalUsesLibs(ctx)...)
-	if !noFrameworkLibs {
-		// dexpreopt/dexpreopt.go needs the paths to the dex jars of these libraries in case construct_context.sh needs
-		// to pass them to dex2oat.  Add them as a dependency so we can determine the path to the dex jar of each
-		// library to dexpreopt.
-		ctx.AddVariationDependencies(nil, usesLibTag,
-			"org.apache.http.legacy",
-			"android.hidl.base-V1.0-java",
-			"android.hidl.manager-V1.0-java")
+func (u *usesLibrary) deps(ctx android.BottomUpMutatorContext, hasFrameworkLibs bool) {
+	if !ctx.Config().UnbundledBuild() {
+		ctx.AddVariationDependencies(nil, usesLibTag, u.usesLibraryProperties.Uses_libs...)
+		ctx.AddVariationDependencies(nil, usesLibTag, u.presentOptionalUsesLibs(ctx)...)
+		// Only add these extra dependencies if the module depends on framework libs. This avoids
+		// creating a cyclic dependency:
+		//     e.g. framework-res -> org.apache.http.legacy -> ... -> framework-res.
+		if hasFrameworkLibs {
+			// dexpreopt/dexpreopt.go needs the paths to the dex jars of these libraries in case construct_context.sh needs
+			// to pass them to dex2oat.  Add them as a dependency so we can determine the path to the dex jar of each
+			// library to dexpreopt.
+			ctx.AddVariationDependencies(nil, usesLibTag,
+				"org.apache.http.legacy",
+				"android.hidl.base-V1.0-java",
+				"android.hidl.manager-V1.0-java")
+		}
 	}
 }
 
diff --git a/java/app_builder.go b/java/app_builder.go
index fa77bbf..348c8b4 100644
--- a/java/app_builder.go
+++ b/java/app_builder.go
@@ -31,7 +31,7 @@
 var (
 	Signapk = pctx.AndroidStaticRule("signapk",
 		blueprint.RuleParams{
-			Command: `${config.JavaCmd} -Djava.library.path=$$(dirname $signapkJniLibrary) ` +
+			Command: `${config.JavaCmd} ${config.JavaVmFlags} -Djava.library.path=$$(dirname $signapkJniLibrary) ` +
 				`-jar $signapkCmd $flags $certificates $in $out`,
 			CommandDeps: []string{"$signapkCmd", "$signapkJniLibrary"},
 		},
diff --git a/java/app_test.go b/java/app_test.go
index 559afcc..c7ea338 100644
--- a/java/app_test.go
+++ b/java/app_test.go
@@ -130,8 +130,12 @@
 		foo.Output(expectedOutput)
 	}
 
-	if g, w := foo.Module().(*AndroidApp).Srcs().Strings(), expectedOutputs; !reflect.DeepEqual(g, w) {
-		t.Errorf("want Srcs() = %q, got %q", w, g)
+	outputFiles, err := foo.Module().(*AndroidApp).OutputFiles("")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if g, w := outputFiles.Strings(), expectedOutputs; !reflect.DeepEqual(g, w) {
+		t.Errorf(`want OutputFiles("") = %q, got %q`, w, g)
 	}
 }
 
@@ -552,34 +556,34 @@
 
 		android_test {
 			name: "test",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			jni_libs: ["libjni"],
 		}
 
 		android_test {
 			name: "test_first",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			compile_multilib: "first",
 			jni_libs: ["libjni"],
 		}
 
 		android_test {
 			name: "test_both",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			compile_multilib: "both",
 			jni_libs: ["libjni"],
 		}
 
 		android_test {
 			name: "test_32",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			compile_multilib: "32",
 			jni_libs: ["libjni"],
 		}
 
 		android_test {
 			name: "test_64",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			compile_multilib: "64",
 			jni_libs: ["libjni"],
 		}
@@ -642,26 +646,26 @@
 
 		android_test {
 			name: "test",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			jni_libs: ["libjni"],
 		}
 
 		android_test {
 			name: "test_noembed",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			jni_libs: ["libjni"],
 			use_embedded_native_libs: false,
 		}
 
 		android_test_helper_app {
 			name: "test_helper",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			jni_libs: ["libjni"],
 		}
 
 		android_test_helper_app {
 			name: "test_helper_noembed",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			jni_libs: ["libjni"],
 			use_embedded_native_libs: false,
 		}
@@ -696,7 +700,6 @@
 			}
 		})
 	}
-
 }
 
 func TestCertificates(t *testing.T) {
@@ -1199,6 +1202,10 @@
 			compile_multilib: "both",
 			sdk_version: "current",
 		}
+
+		ndk_prebuilt_shared_stl {
+			name: "ndk_libc++_shared",
+		}
 		`)
 
 	testCases := []struct {
@@ -1208,7 +1215,7 @@
 		{"stl",
 			[]string{
 				"libjni.so",
-				"libc++.so",
+				"libc++_shared.so",
 			},
 		},
 		{"system",
@@ -1319,3 +1326,251 @@
 		t.Errorf("wanted %q in %q", w, cmd)
 	}
 }
+
+func TestCodelessApp(t *testing.T) {
+	testCases := []struct {
+		name   string
+		bp     string
+		noCode bool
+	}{
+		{
+			name: "normal",
+			bp: `
+				android_app {
+					name: "foo",
+					srcs: ["a.java"],
+				}
+			`,
+			noCode: false,
+		},
+		{
+			name: "app without sources",
+			bp: `
+				android_app {
+					name: "foo",
+				}
+			`,
+			noCode: true,
+		},
+		{
+			name: "app with libraries",
+			bp: `
+				android_app {
+					name: "foo",
+					static_libs: ["lib"],
+				}
+
+				java_library {
+					name: "lib",
+					srcs: ["a.java"],
+				}
+			`,
+			noCode: false,
+		},
+		{
+			name: "app with sourceless libraries",
+			bp: `
+				android_app {
+					name: "foo",
+					static_libs: ["lib"],
+				}
+
+				java_library {
+					name: "lib",
+				}
+			`,
+			// TODO(jungjw): this should probably be true
+			noCode: false,
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.name, func(t *testing.T) {
+			ctx := testApp(t, test.bp)
+
+			foo := ctx.ModuleForTests("foo", "android_common")
+			manifestFixerArgs := foo.Output("manifest_fixer/AndroidManifest.xml").Args["args"]
+			if strings.Contains(manifestFixerArgs, "--has-no-code") != test.noCode {
+				t.Errorf("unexpected manifest_fixer args: %q", manifestFixerArgs)
+			}
+		})
+	}
+}
+
+func TestEmbedNotice(t *testing.T) {
+	ctx := testJava(t, cc.GatherRequiredDepsForTest(android.Android)+`
+		android_app {
+			name: "foo",
+			srcs: ["a.java"],
+			static_libs: ["javalib"],
+			jni_libs: ["libjni"],
+			notice: "APP_NOTICE",
+			embed_notices: true,
+		}
+
+		// No embed_notice flag
+		android_app {
+			name: "bar",
+			srcs: ["a.java"],
+			jni_libs: ["libjni"],
+			notice: "APP_NOTICE",
+		}
+
+		// No NOTICE files
+		android_app {
+			name: "baz",
+			srcs: ["a.java"],
+			embed_notices: true,
+		}
+
+		cc_library {
+			name: "libjni",
+			system_shared_libs: [],
+			stl: "none",
+			notice: "LIB_NOTICE",
+		}
+
+		java_library {
+			name: "javalib",
+			srcs: [
+				":gen",
+			],
+		}
+
+		genrule {
+			name: "gen",
+			tools: ["gentool"],
+			out: ["gen.java"],
+			notice: "GENRULE_NOTICE",
+		}
+
+		java_binary_host {
+			name: "gentool",
+			srcs: ["b.java"],
+			notice: "TOOL_NOTICE",
+		}
+	`)
+
+	// foo has NOTICE files to process, and embed_notices is true.
+	foo := ctx.ModuleForTests("foo", "android_common")
+	// verify merge notices rule.
+	mergeNotices := foo.Rule("mergeNoticesRule")
+	noticeInputs := mergeNotices.Inputs.Strings()
+	// TOOL_NOTICE should be excluded as it's a host module.
+	if len(mergeNotices.Inputs) != 3 {
+		t.Errorf("number of input notice files: expected = 3, actual = %q", noticeInputs)
+	}
+	if !inList("APP_NOTICE", noticeInputs) {
+		t.Errorf("APP_NOTICE is missing from notice files, %q", noticeInputs)
+	}
+	if !inList("LIB_NOTICE", noticeInputs) {
+		t.Errorf("LIB_NOTICE is missing from notice files, %q", noticeInputs)
+	}
+	if !inList("GENRULE_NOTICE", noticeInputs) {
+		t.Errorf("GENRULE_NOTICE is missing from notice files, %q", noticeInputs)
+	}
+	// aapt2 flags should include -A <NOTICE dir> so that its contents are put in the APK's /assets.
+	res := foo.Output("package-res.apk")
+	aapt2Flags := res.Args["flags"]
+	e := "-A " + buildDir + "/.intermediates/foo/android_common/NOTICE"
+	if !strings.Contains(aapt2Flags, e) {
+		t.Errorf("asset dir flag for NOTICE, %q is missing in aapt2 link flags, %q", e, aapt2Flags)
+	}
+
+	// bar has NOTICE files to process, but embed_notices is not set.
+	bar := ctx.ModuleForTests("bar", "android_common")
+	mergeNotices = bar.MaybeRule("mergeNoticesRule")
+	if mergeNotices.Rule != nil {
+		t.Errorf("mergeNotices shouldn't have run for bar")
+	}
+
+	// baz's embed_notice is true, but it doesn't have any NOTICE files.
+	baz := ctx.ModuleForTests("baz", "android_common")
+	mergeNotices = baz.MaybeRule("mergeNoticesRule")
+	if mergeNotices.Rule != nil {
+		t.Errorf("mergeNotices shouldn't have run for baz")
+	}
+}
+
+func TestUncompressDex(t *testing.T) {
+	testCases := []struct {
+		name string
+		bp   string
+
+		uncompressedPlatform  bool
+		uncompressedUnbundled bool
+	}{
+		{
+			name: "normal",
+			bp: `
+				android_app {
+					name: "foo",
+					srcs: ["a.java"],
+				}
+			`,
+			uncompressedPlatform:  true,
+			uncompressedUnbundled: false,
+		},
+		{
+			name: "use_embedded_dex",
+			bp: `
+				android_app {
+					name: "foo",
+					use_embedded_dex: true,
+					srcs: ["a.java"],
+				}
+			`,
+			uncompressedPlatform:  true,
+			uncompressedUnbundled: true,
+		},
+		{
+			name: "privileged",
+			bp: `
+				android_app {
+					name: "foo",
+					privileged: true,
+					srcs: ["a.java"],
+				}
+			`,
+			uncompressedPlatform:  true,
+			uncompressedUnbundled: true,
+		},
+	}
+
+	test := func(t *testing.T, bp string, want bool, unbundled bool) {
+		t.Helper()
+
+		config := testConfig(nil)
+		if unbundled {
+			config.TestProductVariables.Unbundled_build = proptools.BoolPtr(true)
+		}
+
+		ctx := testAppContext(config, bp, nil)
+
+		run(t, ctx, config)
+
+		foo := ctx.ModuleForTests("foo", "android_common")
+		dex := foo.Rule("r8")
+		uncompressedInDexJar := strings.Contains(dex.Args["zipFlags"], "-L 0")
+		aligned := foo.MaybeRule("zipalign").Rule != nil
+
+		if uncompressedInDexJar != want {
+			t.Errorf("want uncompressed in dex %v, got %v", want, uncompressedInDexJar)
+		}
+
+		if aligned != want {
+			t.Errorf("want aligned %v, got %v", want, aligned)
+		}
+	}
+
+	for _, tt := range testCases {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Run("platform", func(t *testing.T) {
+				test(t, tt.bp, tt.uncompressedPlatform, false)
+			})
+			t.Run("unbundled", func(t *testing.T) {
+				test(t, tt.bp, tt.uncompressedUnbundled, true)
+			})
+		})
+	}
+}
diff --git a/java/builder.go b/java/builder.go
index d257d1d..a48e8b1 100644
--- a/java/builder.go
+++ b/java/builder.go
@@ -43,7 +43,8 @@
 			Command: `rm -rf "$outDir" "$annoDir" "$srcJarDir" && mkdir -p "$outDir" "$annoDir" "$srcJarDir" && ` +
 				`${config.ZipSyncCmd} -d $srcJarDir -l $srcJarDir/list -f "*.java" $srcJars && ` +
 				`(if [ -s $srcJarDir/list ] || [ -s $out.rsp ] ; then ` +
-				`${config.SoongJavacWrapper} ${config.JavacWrapper}${config.JavacCmd} ${config.JavacHeapFlags} ${config.CommonJdkFlags} ` +
+				`${config.SoongJavacWrapper} ${config.JavacWrapper}${config.JavacCmd} ` +
+				`${config.JavacHeapFlags} ${config.JavacVmFlags} ${config.CommonJdkFlags} ` +
 				`$processorpath $processor $javacFlags $bootClasspath $classpath ` +
 				`-source $javaVersion -target $javaVersion ` +
 				`-d $outDir -s $annoDir @$out.rsp @$srcJarDir/list ; fi ) && ` +
@@ -64,7 +65,7 @@
 	turbine = pctx.AndroidStaticRule("turbine",
 		blueprint.RuleParams{
 			Command: `rm -rf "$outDir" && mkdir -p "$outDir" && ` +
-				`${config.JavaCmd} -jar ${config.TurbineJar} --output $out.tmp ` +
+				`${config.JavaCmd} ${config.JavaVmFlags} -jar ${config.TurbineJar} --output $out.tmp ` +
 				`--temp_dir "$outDir" --sources @$out.rsp  --source_jars $srcJars ` +
 				`--javacopts ${config.CommonJdkFlags} ` +
 				`$javacFlags -source $javaVersion -target $javaVersion -- $bootClasspath $classpath && ` +
@@ -108,7 +109,7 @@
 
 	jarjar = pctx.AndroidStaticRule("jarjar",
 		blueprint.RuleParams{
-			Command:     "${config.JavaCmd} -jar ${config.JarjarCmd} process $rulesFile $in $out",
+			Command:     "${config.JavaCmd} ${config.JavaVmFlags} -jar ${config.JarjarCmd} process $rulesFile $in $out",
 			CommandDeps: []string{"${config.JavaCmd}", "${config.JarjarCmd}", "$rulesFile"},
 		},
 		"rulesFile")
@@ -124,7 +125,7 @@
 
 	jetifier = pctx.AndroidStaticRule("jetifier",
 		blueprint.RuleParams{
-			Command:     "${config.JavaCmd} -jar ${config.JetifierJar} -l error -o $out -i $in",
+			Command:     "${config.JavaCmd}  ${config.JavaVmFlags} -jar ${config.JetifierJar} -l error -o $out -i $in",
 			CommandDeps: []string{"${config.JavaCmd}", "${config.JetifierJar}"},
 		},
 	)
@@ -147,15 +148,16 @@
 }
 
 type javaBuilderFlags struct {
-	javacFlags    string
-	bootClasspath classpath
-	classpath     classpath
-	processorPath classpath
-	processor     string
-	systemModules classpath
-	aidlFlags     string
-	aidlDeps      android.Paths
-	javaVersion   string
+	javacFlags        string
+	bootClasspath     classpath
+	classpath         classpath
+	processorPath     classpath
+	processor         string
+	systemModules     classpath
+	systemModulesDeps android.Paths
+	aidlFlags         string
+	aidlDeps          android.Paths
+	javaVersion       string
 
 	errorProneExtraJavacFlags string
 	errorProneProcessorPath   classpath
@@ -247,7 +249,7 @@
 
 	var bootClasspath string
 	if flags.javaVersion == "1.9" {
-		deps = append(deps, flags.systemModules...)
+		deps = append(deps, flags.systemModulesDeps...)
 		bootClasspath = flags.systemModules.FormJavaSystemModulesPath("--system=", ctx.Device())
 	} else {
 		deps = append(deps, flags.bootClasspath...)
@@ -429,7 +431,7 @@
 	if len(*x) > 1 {
 		panic("more than one system module")
 	} else if len(*x) == 1 {
-		return optName + strings.TrimSuffix((*x)[0].String(), "lib/modules")
+		return optName + (*x)[0].String()
 	} else if forceEmpty {
 		return optName + "none"
 	} else {
diff --git a/java/config/config.go b/java/config/config.go
index f9552d5..6ade649 100644
--- a/java/config/config.go
+++ b/java/config/config.go
@@ -69,6 +69,8 @@
 		// b/65004097: prevent using java.lang.invoke.StringConcatFactory when using -target 1.9
 		`-XDstringConcat=inline`,
 	}, " "))
+	pctx.StaticVariable("JavaVmFlags", "-XX:OnError=\"cat hs_err_pid%p.log\" -XX:CICompilerCount=6 -XX:+UseDynamicNumberOfGCThreads")
+	pctx.StaticVariable("JavacVmFlags", "-J-XX:OnError=\"cat hs_err_pid%p.log\" -J-XX:CICompilerCount=6 -J-XX:+UseDynamicNumberOfGCThreads")
 
 	pctx.VariableConfigMethod("hostPrebuiltTag", android.Config.PrebuiltOS)
 
diff --git a/java/config/kotlin.go b/java/config/kotlin.go
index 7cea042..fd8e3db 100644
--- a/java/config/kotlin.go
+++ b/java/config/kotlin.go
@@ -32,6 +32,7 @@
 	pctx.SourcePathVariable("KotlinScriptRuntimeJar", "external/kotlinc/lib/kotlin-script-runtime.jar")
 	pctx.SourcePathVariable("KotlinTrove4jJar", "external/kotlinc/lib/trove4j.jar")
 	pctx.SourcePathVariable("KotlinKaptJar", "external/kotlinc/lib/kotlin-annotation-processing.jar")
+	pctx.SourcePathVariable("KotlinAnnotationJar", "external/kotlinc/lib/annotations-13.0.jar")
 	pctx.SourcePathVariable("KotlinStdlibJar", KotlinStdlibJar)
 
 	// These flags silence "Illegal reflective access" warnings when running kotlinc in OpenJDK9
diff --git a/java/config/makevars.go b/java/config/makevars.go
index 9c78511..ead298a 100644
--- a/java/config/makevars.go
+++ b/java/config/makevars.go
@@ -39,8 +39,8 @@
 	ctx.Strict("ANDROID_JAVA8_HOME", "prebuilts/jdk/jdk8/${hostPrebuiltTag}")
 	ctx.Strict("ANDROID_JAVA9_HOME", "prebuilts/jdk/jdk9/${hostPrebuiltTag}")
 	ctx.Strict("ANDROID_JAVA_TOOLCHAIN", "${JavaToolchain}")
-	ctx.Strict("JAVA", "${JavaCmd}")
-	ctx.Strict("JAVAC", "${JavacCmd}")
+	ctx.Strict("JAVA", "${JavaCmd} ${JavaVmFlags}")
+	ctx.Strict("JAVAC", "${JavacCmd} ${JavacVmFlags}")
 	ctx.Strict("JAR", "${JarCmd}")
 	ctx.Strict("JAR_ARGS", "${JarArgsCmd}")
 	ctx.Strict("JAVADOC", "${JavadocCmd}")
@@ -58,8 +58,8 @@
 		ctx.Strict("ERROR_PRONE_CHECKS", "${ErrorProneChecks}")
 	}
 
-	ctx.Strict("TARGET_JAVAC", "${JavacCmd} ${CommonJdkFlags}")
-	ctx.Strict("HOST_JAVAC", "${JavacCmd} ${CommonJdkFlags}")
+	ctx.Strict("TARGET_JAVAC", "${JavacCmd}  ${JavacVmFlags} ${CommonJdkFlags}")
+	ctx.Strict("HOST_JAVAC", "${JavacCmd}  ${JavacVmFlags} ${CommonJdkFlags}")
 
 	ctx.Strict("JLINK", "${JlinkCmd}")
 	ctx.Strict("JMOD", "${JmodCmd}")
diff --git a/java/device_host_converter_test.go b/java/device_host_converter_test.go
index 146bf6f..9b9d0d8 100644
--- a/java/device_host_converter_test.go
+++ b/java/device_host_converter_test.go
@@ -126,7 +126,7 @@
 
 		java_library {
 			name: "device_module",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 			srcs: ["b.java"],
 			java_resources: ["java-res/b/b"],
 			static_libs: ["host_for_device_module"],
diff --git a/java/dexpreopt.go b/java/dexpreopt.go
index 23d2aa6..ed12fe6 100644
--- a/java/dexpreopt.go
+++ b/java/dexpreopt.go
@@ -132,8 +132,10 @@
 	}
 
 	var images android.Paths
+	var imagesDeps []android.Paths
 	for _, arch := range archs {
 		images = append(images, bootImage.images[arch])
+		imagesDeps = append(imagesDeps, bootImage.imagesDeps[arch])
 	}
 
 	dexLocation := android.InstallPathToOnDevicePath(ctx, d.installPath)
@@ -173,8 +175,9 @@
 		UsesLibraries:                d.usesLibs,
 		LibraryPaths:                 d.libraryPaths,
 
-		Archs:           archs,
-		DexPreoptImages: images,
+		Archs:               archs,
+		DexPreoptImages:     images,
+		DexPreoptImagesDeps: imagesDeps,
 
 		// We use the dex paths and dex locations of the default boot image, as it
 		// contains the full dexpreopt boot classpath. Other images may just contain a subset of
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 2a1a901..fe468a9 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -58,9 +58,32 @@
 	symbolsDir   android.OutputPath
 	targets      []android.Target
 	images       map[android.ArchType]android.OutputPath
+	imagesDeps   map[android.ArchType]android.Paths
 	zip          android.WritablePath
 }
 
+func (image bootImageConfig) moduleFiles(ctx android.PathContext, dir android.OutputPath, exts ...string) []android.OutputPath {
+	ret := make([]android.OutputPath, 0, len(image.modules)*len(exts))
+
+	// dex preopt on the bootclasspath produces multiple files.  The first dex file
+	// is converted into to 'name'.art (to match the legacy assumption that 'name'.art
+	// exists), and the rest are converted to 'name'-<jar>.art.
+	// In addition, each .art file has an associated .oat and .vdex file, and an
+	// unstripped .oat file
+	for i, m := range image.modules {
+		name := image.name
+		if i != 0 {
+			name += "-" + m
+		}
+
+		for _, ext := range exts {
+			ret = append(ret, dir.Join(ctx, name+ext))
+		}
+	}
+
+	return ret
+}
+
 type bootImage struct {
 	bootImageConfig
 
@@ -263,8 +286,6 @@
 	if profile != nil {
 		cmd.FlagWithArg("--compiler-filter=", "speed-profile")
 		cmd.FlagWithInput("--profile-file=", profile)
-	} else if global.PreloadedClasses.Valid() {
-		cmd.FlagWithInput("--image-classes=", global.PreloadedClasses.Path())
 	}
 
 	if global.DirtyImageObjects.Valid() {
@@ -302,49 +323,38 @@
 	installDir := filepath.Join("/system/framework", arch.String())
 	vdexInstallDir := filepath.Join("/system/framework")
 
-	var extraFiles android.WritablePaths
 	var vdexInstalls android.RuleBuilderInstalls
 	var unstrippedInstalls android.RuleBuilderInstalls
 
 	var zipFiles android.WritablePaths
 
-	// dex preopt on the bootclasspath produces multiple files.  The first dex file
-	// is converted into to 'name'.art (to match the legacy assumption that 'name'.art
-	// exists), and the rest are converted to 'name'-<jar>.art.
-	// In addition, each .art file has an associated .oat and .vdex file, and an
-	// unstripped .oat file
-	for i, m := range image.modules {
-		name := image.name
-		if i != 0 {
-			name += "-" + m
-		}
+	for _, artOrOat := range image.moduleFiles(ctx, outputDir, ".art", ".oat") {
+		cmd.ImplicitOutput(artOrOat)
+		zipFiles = append(zipFiles, artOrOat)
 
-		art := outputDir.Join(ctx, name+".art")
-		oat := outputDir.Join(ctx, name+".oat")
-		vdex := outputDir.Join(ctx, name+".vdex")
-		unstrippedOat := symbolsDir.Join(ctx, name+".oat")
+		// Install the .oat and .art files
+		rule.Install(artOrOat, filepath.Join(installDir, artOrOat.Base()))
+	}
 
-		extraFiles = append(extraFiles, art, oat, vdex, unstrippedOat)
-
-		zipFiles = append(zipFiles, art, oat, vdex)
-
-		// Install the .oat and .art files.
-		rule.Install(art, filepath.Join(installDir, art.Base()))
-		rule.Install(oat, filepath.Join(installDir, oat.Base()))
+	for _, vdex := range image.moduleFiles(ctx, outputDir, ".vdex") {
+		cmd.ImplicitOutput(vdex)
+		zipFiles = append(zipFiles, vdex)
 
 		// The vdex files are identical between architectures, install them to a shared location.  The Make rules will
 		// only use the install rules for one architecture, and will create symlinks into the architecture-specific
 		// directories.
 		vdexInstalls = append(vdexInstalls,
 			android.RuleBuilderInstall{vdex, filepath.Join(vdexInstallDir, vdex.Base())})
+	}
+
+	for _, unstrippedOat := range image.moduleFiles(ctx, symbolsDir, ".oat") {
+		cmd.ImplicitOutput(unstrippedOat)
 
 		// Install the unstripped oat files.  The Make rules will put these in $(TARGET_OUT_UNSTRIPPED)
 		unstrippedInstalls = append(unstrippedInstalls,
 			android.RuleBuilderInstall{unstrippedOat, filepath.Join(installDir, unstrippedOat.Base())})
 	}
 
-	cmd.ImplicitOutputs(extraFiles)
-
 	rule.Build(pctx, ctx, image.name+"JarsDexpreopt_"+arch.String(), "dexpreopt "+image.name+" jars "+arch.String())
 
 	// save output and installed files for makevars
@@ -362,7 +372,7 @@
 func bootImageProfileRule(ctx android.SingletonContext, image *bootImage, missingDeps []string) android.WritablePath {
 	global := dexpreoptGlobalConfig(ctx)
 
-	if !global.UseProfileForBootImage || ctx.Config().IsPdkBuild() || ctx.Config().UnbundledBuild() {
+	if global.DisableGenerateProfile || ctx.Config().IsPdkBuild() || ctx.Config().UnbundledBuild() {
 		return nil
 	}
 	return ctx.Config().Once(bootImageProfileRuleKey, func() interface{} {
@@ -496,6 +506,7 @@
 			for _, arch := range arches {
 				ctx.Strict("DEXPREOPT_IMAGE_VDEX_BUILT_INSTALLED_"+current.name+"_"+arch.String(), current.vdexInstalls[arch].String())
 				ctx.Strict("DEXPREOPT_IMAGE_"+current.name+"_"+arch.String(), current.images[arch].String())
+				ctx.Strict("DEXPREOPT_IMAGE_DEPS_"+current.name+"_"+arch.String(), strings.Join(current.imagesDeps[arch].Strings(), " "))
 				ctx.Strict("DEXPREOPT_IMAGE_BUILT_INSTALLED_"+current.name+"_"+arch.String(), current.installs[arch].String())
 				ctx.Strict("DEXPREOPT_IMAGE_UNSTRIPPED_BUILT_INSTALLED_"+current.name+"_"+arch.String(), current.unstrippedInstalls[arch].String())
 				if current.zip != nil {
diff --git a/java/dexpreopt_bootjars_test.go b/java/dexpreopt_bootjars_test.go
index cbb52f1..f91ff69 100644
--- a/java/dexpreopt_bootjars_test.go
+++ b/java/dexpreopt_bootjars_test.go
@@ -62,6 +62,7 @@
 	bootArt := dexpreoptBootJars.Output("boot.art")
 
 	expectedInputs := []string{
+		"dex_bootjars/boot.prof",
 		"dex_bootjars_input/foo.jar",
 		"dex_bootjars_input/bar.jar",
 		"dex_bootjars_input/baz.jar",
diff --git a/java/dexpreopt_config.go b/java/dexpreopt_config.go
index d903f45..4a4d6d5 100644
--- a/java/dexpreopt_config.go
+++ b/java/dexpreopt_config.go
@@ -49,7 +49,8 @@
 		return ctx.Config().Once(dexpreoptTestGlobalConfigKey, func() interface{} {
 			// Nope, return a config with preopting disabled
 			return globalConfigAndRaw{dexpreopt.GlobalConfig{
-				DisablePreopt: true,
+				DisablePreopt:          true,
+				DisableGenerateProfile: true,
 			}, nil}
 		})
 	}).(globalConfigAndRaw)
@@ -137,27 +138,35 @@
 
 		dir := android.PathForOutput(ctx, ctx.Config().DeviceName(), "dex_bootjars")
 		symbolsDir := android.PathForOutput(ctx, ctx.Config().DeviceName(), "dex_bootjars_unstripped")
-		images := make(map[android.ArchType]android.OutputPath)
 		zip := dir.Join(ctx, "boot.zip")
 
 		targets := dexpreoptTargets(ctx)
 
-		for _, target := range targets {
-			images[target.Arch.ArchType] = dir.Join(ctx,
-				"system/framework", target.Arch.ArchType.String()).Join(ctx, "boot.art")
-		}
-
-		return bootImageConfig{
+		imageConfig := bootImageConfig{
 			name:         "boot",
 			modules:      nonUpdatableBootModules,
 			dexLocations: nonUpdatableBootLocations,
 			dexPaths:     nonUpdatableBootDexPaths,
 			dir:          dir,
 			symbolsDir:   symbolsDir,
-			images:       images,
+			images:       make(map[android.ArchType]android.OutputPath),
+			imagesDeps:   make(map[android.ArchType]android.Paths),
 			targets:      targets,
 			zip:          zip,
 		}
+
+		for _, target := range targets {
+			imageDir := dir.Join(ctx, "system/framework", target.Arch.ArchType.String())
+			imageConfig.images[target.Arch.ArchType] = imageDir.Join(ctx, "boot.art")
+
+			imagesDeps := make([]android.Path, 0, len(imageConfig.modules)*3)
+			for _, dep := range imageConfig.moduleFiles(ctx, imageDir, ".art", ".oat", ".vdex") {
+				imagesDeps = append(imagesDeps, dep)
+			}
+			imageConfig.imagesDeps[target.Arch.ArchType] = imagesDeps
+		}
+
+		return imageConfig
 	}).(bootImageConfig)
 }
 
@@ -196,16 +205,10 @@
 
 		dir := android.PathForOutput(ctx, ctx.Config().DeviceName(), "dex_apexjars")
 		symbolsDir := android.PathForOutput(ctx, ctx.Config().DeviceName(), "dex_apexjars_unstripped")
-		images := make(map[android.ArchType]android.OutputPath)
 
 		targets := dexpreoptTargets(ctx)
 
-		for _, target := range targets {
-			images[target.Arch.ArchType] = dir.Join(ctx,
-				"system/framework", target.Arch.ArchType.String(), "apex.art")
-		}
-
-		return bootImageConfig{
+		imageConfig := bootImageConfig{
 			name:         "apex",
 			modules:      imageModules,
 			dexLocations: bootLocations,
@@ -213,8 +216,22 @@
 			dir:          dir,
 			symbolsDir:   symbolsDir,
 			targets:      targets,
-			images:       images,
+			images:       make(map[android.ArchType]android.OutputPath),
+			imagesDeps:   make(map[android.ArchType]android.Paths),
 		}
+
+		for _, target := range targets {
+			imageDir := dir.Join(ctx, "system/framework", target.Arch.ArchType.String())
+			imageConfig.images[target.Arch.ArchType] = imageDir.Join(ctx, "apex.art")
+
+			imagesDeps := make([]android.Path, 0, len(imageConfig.modules)*3)
+			for _, dep := range imageConfig.moduleFiles(ctx, imageDir, ".art", ".oat", ".vdex") {
+				imagesDeps = append(imagesDeps, dep)
+			}
+			imageConfig.imagesDeps[target.Arch.ArchType] = imagesDeps
+		}
+
+		return imageConfig
 	}).(bootImageConfig)
 }
 
diff --git a/java/droiddoc.go b/java/droiddoc.go
index 57da6b6..734b411 100644
--- a/java/droiddoc.go
+++ b/java/droiddoc.go
@@ -73,7 +73,7 @@
 			Command: `rm -rf "$outDir" "$srcJarDir" "$stubsDir" && ` +
 				`mkdir -p "$outDir" "$srcJarDir" "$stubsDir" && ` +
 				`${config.ZipSyncCmd} -d $srcJarDir -l $srcJarDir/list -f "*.java" $srcJars && ` +
-				`${config.JavaCmd} -jar ${config.MetalavaJar} -encoding UTF-8 -source $javaVersion @$out.rsp @$srcJarDir/list ` +
+				`${config.JavaCmd}  ${config.JavaVmFlags} -jar ${config.MetalavaJar} -encoding UTF-8 -source $javaVersion @$out.rsp @$srcJarDir/list ` +
 				`$bootclasspathArgs $classpathArgs $sourcepathArgs --no-banner --color --quiet --format=v2 ` +
 				`$opts && ` +
 				`${config.SoongZipCmd} -write_if_changed -jar -o $out -C $stubsDir -D $stubsDir && ` +
@@ -95,7 +95,7 @@
 		blueprint.RuleParams{
 			Command: `( rm -rf "$srcJarDir" && mkdir -p "$srcJarDir" && ` +
 				`${config.ZipSyncCmd} -d $srcJarDir -l $srcJarDir/list -f "*.java" $srcJars && ` +
-				`${config.JavaCmd} -jar ${config.MetalavaJar} -encoding UTF-8 -source $javaVersion @$out.rsp @$srcJarDir/list ` +
+				`${config.JavaCmd}  ${config.JavaVmFlags} -jar ${config.MetalavaJar} -encoding UTF-8 -source $javaVersion @$out.rsp @$srcJarDir/list ` +
 				`$bootclasspathArgs $classpathArgs $sourcepathArgs --no-banner --color --quiet --format=v2 ` +
 				`$opts && touch $out && rm -rf "$srcJarDir") || ` +
 				`( echo -e "$msg" ; exit 38 )`,
@@ -120,7 +120,7 @@
 			Command: `rm -rf "$outDir" "$srcJarDir" "$stubsDir" && ` +
 				`mkdir -p "$outDir" "$srcJarDir" "$stubsDir" && ` +
 				`${config.ZipSyncCmd} -d $srcJarDir -l $srcJarDir/list -f "*.java" $srcJars && ` +
-				`${config.JavaCmd} -jar ${config.DokkaJar} $srcJarDir ` +
+				`${config.JavaCmd} ${config.JavaVmFlags} -jar ${config.DokkaJar} $srcJarDir ` +
 				`$classpathArgs -format dac -dacRoot /reference/kotlin -output $outDir $opts && ` +
 				`${config.SoongZipCmd} -write_if_changed -d -o $docZip -C $outDir -D $outDir && ` +
 				`${config.SoongZipCmd} -write_if_changed -jar -o $out -C $stubsDir -D $stubsDir && ` +
@@ -171,13 +171,6 @@
 	// list of java libraries that will be in the classpath.
 	Libs []string `android:"arch_variant"`
 
-	// don't build against the default libraries (bootclasspath, ext, and framework for device
-	// targets)
-	No_standard_libs *bool
-
-	// don't build against the framework libraries (ext, and framework for device targets)
-	No_framework_libs *bool
-
 	// the java library (in classpath) for documentation that provides java srcs and srcjars.
 	Srcs_lib *string
 
@@ -497,8 +490,13 @@
 	stubsSrcJar android.WritablePath
 }
 
-func (j *Javadoc) Srcs() android.Paths {
-	return android.Paths{j.stubsSrcJar}
+func (j *Javadoc) OutputFiles(tag string) (android.Paths, error) {
+	switch tag {
+	case "":
+		return android.Paths{j.stubsSrcJar}, nil
+	default:
+		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
+	}
 }
 
 func JavadocFactory() android.Module {
@@ -519,7 +517,7 @@
 	return module
 }
 
-var _ android.SourceFileProducer = (*Javadoc)(nil)
+var _ android.OutputFileProducer = (*Javadoc)(nil)
 
 func (j *Javadoc) sdkVersion() string {
 	return String(j.properties.Sdk_version)
@@ -535,14 +533,14 @@
 
 func (j *Javadoc) addDeps(ctx android.BottomUpMutatorContext) {
 	if ctx.Device() {
-		if !Bool(j.properties.No_standard_libs) {
-			sdkDep := decodeSdkDep(ctx, sdkContext(j))
+		sdkDep := decodeSdkDep(ctx, sdkContext(j))
+		if sdkDep.hasStandardLibs() {
 			if sdkDep.useDefaultLibs {
 				ctx.AddVariationDependencies(nil, bootClasspathTag, config.DefaultBootclasspathLibraries...)
 				if ctx.Config().TargetOpenJDK9() {
 					ctx.AddVariationDependencies(nil, systemModulesTag, config.DefaultSystemModules)
 				}
-				if !Bool(j.properties.No_framework_libs) {
+				if sdkDep.hasFrameworkLibs() {
 					ctx.AddVariationDependencies(nil, libTag, config.DefaultLibraries...)
 				}
 			} else if sdkDep.useModule {
@@ -687,10 +685,11 @@
 				panic("Found two system module dependencies")
 			}
 			sm := module.(*SystemModules)
-			if sm.outputFile == nil {
+			if sm.outputDir == nil && len(sm.outputDeps) == 0 {
 				panic("Missing directory for system module dependency")
 			}
-			deps.systemModules = sm.outputFile
+			deps.systemModules = sm.outputDir
+			deps.systemModulesDeps = sm.outputDeps
 		}
 	})
 	// do not pass exclude_srcs directly when expanding srcFiles since exclude_srcs
@@ -771,6 +770,7 @@
 		if deps.systemModules != nil {
 			systemModules = append(systemModules, deps.systemModules)
 		}
+		implicits = append(implicits, deps.systemModulesDeps...)
 		bootClasspathArgs = systemModules.FormJavaSystemModulesPath("--system ", ctx.Device())
 		bootClasspathArgs = bootClasspathArgs + " --patch-module java.base=."
 	}
@@ -1746,7 +1746,7 @@
 		jdiff := android.PathForOutput(ctx, "host", ctx.Config().PrebuiltOS(), "framework", "jdiff.jar")
 		jdiffImplicits = append(jdiffImplicits, android.Paths{jdiff, d.apiXmlFile, d.lastReleasedApiXmlFile}...)
 
-		opts := " -encoding UTF-8 -source 1.8 -J-Xmx1600m -XDignore.symbol.file " +
+		opts := " -source 1.8 -J-Xmx1600m -XDignore.symbol.file " +
 			"-doclet jdiff.JDiff -docletpath " + jdiff.String() + " -quiet " +
 			"-newapi " + strings.TrimSuffix(d.apiXmlFile.Base(), d.apiXmlFile.Ext()) +
 			" -newapidir " + filepath.Dir(d.apiXmlFile.String()) +
@@ -1803,9 +1803,6 @@
 	android.DefaultsModuleBase
 }
 
-func (*DocDefaults) GenerateAndroidBuildActions(ctx android.ModuleContext) {
-}
-
 func DocDefaultsFactory() android.Module {
 	module := &DocDefaults{}
 
diff --git a/java/hiddenapi_singleton.go b/java/hiddenapi_singleton.go
index b1ddab4..cf9f492 100644
--- a/java/hiddenapi_singleton.go
+++ b/java/hiddenapi_singleton.go
@@ -15,11 +15,14 @@
 package java
 
 import (
+	"fmt"
+
 	"android/soong/android"
 )
 
 func init() {
 	android.RegisterSingletonType("hiddenapi", hiddenAPISingletonFactory)
+	android.RegisterModuleType("hiddenapi_flags", hiddenAPIFlagsFactory)
 }
 
 type hiddenAPISingletonPathsStruct struct {
@@ -307,3 +310,48 @@
 		Text("fi").
 		Text(")")
 }
+
+type hiddenAPIFlagsProperties struct {
+	// name of the file into which the flags will be copied.
+	Filename *string
+}
+
+type hiddenAPIFlags struct {
+	android.ModuleBase
+
+	properties hiddenAPIFlagsProperties
+
+	outputFilePath android.OutputPath
+}
+
+func (h *hiddenAPIFlags) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+	filename := String(h.properties.Filename)
+
+	inputPath := hiddenAPISingletonPaths(ctx).flags
+	h.outputFilePath = android.PathForModuleOut(ctx, filename).OutputPath
+
+	// This ensures that outputFilePath has the correct name for others to
+	// use, as the source file may have a different name.
+	ctx.Build(pctx, android.BuildParams{
+		Rule:   android.Cp,
+		Output: h.outputFilePath,
+		Input:  inputPath,
+	})
+}
+
+func (h *hiddenAPIFlags) OutputFiles(tag string) (android.Paths, error) {
+	switch tag {
+	case "":
+		return android.Paths{h.outputFilePath}, nil
+	default:
+		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
+	}
+}
+
+// hiddenapi-flags provides access to the hiddenapi-flags.csv file generated during the build.
+func hiddenAPIFlagsFactory() android.Module {
+	module := &hiddenAPIFlags{}
+	module.AddProperties(&module.properties)
+	android.InitAndroidArchModule(module, android.HostAndDeviceSupported, android.MultilibCommon)
+	return module
+}
diff --git a/java/jacoco.go b/java/jacoco.go
index 8b6d4ac..bce9822 100644
--- a/java/jacoco.go
+++ b/java/jacoco.go
@@ -31,7 +31,7 @@
 	jacoco = pctx.AndroidStaticRule("jacoco", blueprint.RuleParams{
 		Command: `rm -rf $tmpDir && mkdir -p $tmpDir && ` +
 			`${config.Zip2ZipCmd} -i $in -o $strippedJar $stripSpec && ` +
-			`${config.JavaCmd} -jar ${config.JacocoCLIJar} ` +
+			`${config.JavaCmd} ${config.JavaVmFlags} -jar ${config.JacocoCLIJar} ` +
 			`  instrument --quiet --dest $tmpDir $strippedJar && ` +
 			`${config.Ziptime} $tmpJar && ` +
 			`${config.MergeZipsCmd} --ignore-duplicates -j $out $tmpJar $in`,
diff --git a/java/java.go b/java/java.go
index 31c6afe..bf80ced 100644
--- a/java/java.go
+++ b/java/java.go
@@ -82,13 +82,6 @@
 	// list of files that should be excluded from java_resources and java_resource_dirs
 	Exclude_java_resources []string `android:"path,arch_variant"`
 
-	// don't build against the default libraries (bootclasspath, ext, and framework for device
-	// targets)
-	No_standard_libs *bool
-
-	// don't build against the framework libraries (ext, and framework for device targets)
-	No_framework_libs *bool
-
 	// list of module-specific flags that will be used for javac compiles
 	Javacflags []string `android:"arch_variant"`
 
@@ -351,15 +344,22 @@
 	dexpreopter
 }
 
-func (j *Module) Srcs() android.Paths {
-	return append(android.Paths{j.outputFile}, j.extraOutputFiles...)
+func (j *Module) OutputFiles(tag string) (android.Paths, error) {
+	switch tag {
+	case "":
+		return append(android.Paths{j.outputFile}, j.extraOutputFiles...), nil
+	case ".jar":
+		return android.Paths{j.implementationAndResourcesJar}, nil
+	default:
+		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
+	}
 }
 
 func (j *Module) DexJarFile() android.Path {
 	return j.dexJarFile
 }
 
-var _ android.SourceFileProducer = (*Module)(nil)
+var _ android.OutputFileProducer = (*Module)(nil)
 
 type Dependency interface {
 	HeaderJars() android.Paths
@@ -373,8 +373,8 @@
 }
 
 type SdkLibraryDependency interface {
-	SdkHeaderJars(ctx android.BaseContext, sdkVersion string) android.Paths
-	SdkImplementationJars(ctx android.BaseContext, sdkVersion string) android.Paths
+	SdkHeaderJars(ctx android.BaseModuleContext, sdkVersion string) android.Paths
+	SdkImplementationJars(ctx android.BaseModuleContext, sdkVersion string) android.Paths
 }
 
 type SrcDependency interface {
@@ -433,6 +433,16 @@
 
 	jars android.Paths
 	aidl android.OptionalPath
+
+	noStandardLibs, noFrameworksLibs bool
+}
+
+func (s sdkDep) hasStandardLibs() bool {
+	return !s.noStandardLibs
+}
+
+func (s sdkDep) hasFrameworkLibs() bool {
+	return !s.noStandardLibs && !s.noFrameworksLibs
 }
 
 type jniLib struct {
@@ -441,11 +451,11 @@
 	target android.Target
 }
 
-func (j *Module) shouldInstrument(ctx android.BaseContext) bool {
+func (j *Module) shouldInstrument(ctx android.BaseModuleContext) bool {
 	return j.properties.Instrument && ctx.Config().IsEnvTrue("EMMA_INSTRUMENT")
 }
 
-func (j *Module) shouldInstrumentStatic(ctx android.BaseContext) bool {
+func (j *Module) shouldInstrumentStatic(ctx android.BaseModuleContext) bool {
 	return j.shouldInstrument(ctx) &&
 		(ctx.Config().IsEnvTrue("EMMA_INSTRUMENT_STATIC") ||
 			ctx.Config().UnbundledBuild())
@@ -471,12 +481,12 @@
 
 func (j *Module) deps(ctx android.BottomUpMutatorContext) {
 	if ctx.Device() {
-		if !Bool(j.properties.No_standard_libs) {
-			sdkDep := decodeSdkDep(ctx, sdkContext(j))
+		sdkDep := decodeSdkDep(ctx, sdkContext(j))
+		if sdkDep.hasStandardLibs() {
 			if sdkDep.useDefaultLibs {
 				ctx.AddVariationDependencies(nil, bootClasspathTag, config.DefaultBootclasspathLibraries...)
 				ctx.AddVariationDependencies(nil, systemModulesTag, config.DefaultSystemModules)
-				if !Bool(j.properties.No_framework_libs) {
+				if sdkDep.hasFrameworkLibs() {
 					ctx.AddVariationDependencies(nil, libTag, config.DefaultLibraries...)
 				}
 			} else if sdkDep.useModule {
@@ -488,8 +498,8 @@
 				}
 			}
 		} else if j.deviceProperties.System_modules == nil {
-			ctx.PropertyErrorf("no_standard_libs",
-				"system_modules is required to be set when no_standard_libs is true, did you mean no_framework_libs?")
+			ctx.PropertyErrorf("sdk_version",
+				`system_modules is required to be set when sdk_version is "none", did you mean "core_platform"`)
 		} else if *j.deviceProperties.System_modules != "none" {
 			ctx.AddVariationDependencies(nil, systemModulesTag, *j.deviceProperties.System_modules)
 		}
@@ -611,6 +621,7 @@
 	srcs               android.Paths
 	srcJars            android.Paths
 	systemModules      android.Path
+	systemModulesDeps  android.Paths
 	aidlPreprocess     android.OptionalPath
 	kotlinStdlib       android.Paths
 	kotlinAnnotations  android.Paths
@@ -657,7 +668,7 @@
 		return javaSdk, true
 	case ver == "current":
 		return javaSdk, false
-	case ver == "":
+	case ver == "" || ver == "none" || ver == "core_platform":
 		return javaPlatform, false
 	default:
 		if _, err := strconv.Atoi(ver); err != nil {
@@ -813,19 +824,16 @@
 			}
 		default:
 			switch tag {
-			case android.DefaultsDepTag, android.SourceDepTag:
-				// Nothing to do
 			case systemModulesTag:
 				if deps.systemModules != nil {
 					panic("Found two system module dependencies")
 				}
 				sm := module.(*SystemModules)
-				if sm.outputFile == nil {
+				if sm.outputDir == nil || len(sm.outputDeps) == 0 {
 					panic("Missing directory for system module dependency")
 				}
-				deps.systemModules = sm.outputFile
-			default:
-				ctx.ModuleErrorf("depends on non-java module %q", otherName)
+				deps.systemModules = sm.outputDir
+				deps.systemModulesDeps = sm.outputDeps
 			}
 		}
 	})
@@ -839,7 +847,8 @@
 	var ret string
 	v := sdkContext.sdkVersion()
 	// For PDK builds, use the latest SDK version instead of "current"
-	if ctx.Config().IsPdkBuild() && (v == "" || v == "current") {
+	if ctx.Config().IsPdkBuild() &&
+		(v == "" || v == "none" || v == "core_platform" || v == "current") {
 		sdkVersions := ctx.Config().Get(sdkVersionsKey).([]int)
 		latestSdkVersion := 0
 		if len(sdkVersions) > 0 {
@@ -858,7 +867,11 @@
 		ret = "1.7"
 	} else if ctx.Device() && sdk <= 29 || !ctx.Config().TargetOpenJDK9() {
 		ret = "1.8"
-	} else if ctx.Device() && sdkContext.sdkVersion() != "" && sdk == android.FutureApiLevel {
+	} else if ctx.Device() &&
+		sdkContext.sdkVersion() != "" &&
+		sdkContext.sdkVersion() != "none" &&
+		sdkContext.sdkVersion() != "core_platform" &&
+		sdk == android.FutureApiLevel {
 		// TODO(ccross): once we generate stubs we should be able to use 1.9 for sdk_version: "current"
 		ret = "1.8"
 	} else {
@@ -910,7 +923,7 @@
 	flags.processor = strings.Join(deps.processorClasses, ",")
 
 	if len(flags.bootClasspath) == 0 && ctx.Host() && flags.javaVersion != "1.9" &&
-		!Bool(j.properties.No_standard_libs) &&
+		decodeSdkDep(ctx, sdkContext(j)).hasStandardLibs() &&
 		inList(flags.javaVersion, []string{"1.6", "1.7", "1.8"}) {
 		// Give host-side tools a version of OpenJDK's standard libraries
 		// close to what they're targeting. As of Dec 2017, AOSP is only
@@ -950,6 +963,7 @@
 	// systemModules
 	if deps.systemModules != nil {
 		flags.systemModules = append(flags.systemModules, deps.systemModules)
+		flags.systemModulesDeps = append(flags.systemModulesDeps, deps.systemModulesDeps...)
 	}
 
 	// aidl flags.
@@ -966,8 +980,6 @@
 
 func (j *Module) compile(ctx android.ModuleContext, aaptSrcJar android.Path) {
 
-	hasSrcs := false
-
 	j.exportAidlIncludeDirs = android.PathsForModuleSrc(ctx, j.deviceProperties.Aidl.Export_include_dirs)
 
 	deps := j.collectDeps(ctx)
@@ -982,9 +994,6 @@
 	}
 
 	srcFiles = j.genSources(ctx, srcFiles, flags)
-	if len(srcFiles) > 0 {
-		hasSrcs = true
-	}
 
 	srcJars := srcFiles.FilterByExt(".srcjar")
 	srcJars = append(srcJars, deps.srcJars...)
@@ -1181,7 +1190,6 @@
 
 	if len(deps.staticJars) > 0 {
 		jars = append(jars, deps.staticJars...)
-		hasSrcs = true
 	}
 
 	manifest := j.overrideManifest
@@ -1293,7 +1301,7 @@
 
 	j.implementationAndResourcesJar = implementationAndResourcesJar
 
-	if ctx.Device() && hasSrcs &&
+	if ctx.Device() && j.hasCode(ctx) &&
 		(Bool(j.properties.Installable) || Bool(j.deviceProperties.Compile_dex)) {
 		// Dex compilation
 		var dexOutputFile android.ModuleOutPath
@@ -1498,6 +1506,11 @@
 	return jdeps
 }
 
+func (j *Module) hasCode(ctx android.ModuleContext) bool {
+	srcFiles := android.PathsForModuleSrcExcludes(ctx, j.properties.Srcs, j.properties.Exclude_srcs)
+	return len(srcFiles) > 0 || len(ctx.GetDirectDepsWithTag(staticLibTag)) > 0
+}
+
 //
 // Java libraries (.jar file)
 //
@@ -2129,9 +2142,6 @@
 	android.DefaultsModuleBase
 }
 
-func (*Defaults) GenerateAndroidBuildActions(ctx android.ModuleContext) {
-}
-
 // java_defaults provides a set of properties that can be inherited by other java or android modules.
 //
 // A module can use the properties from a java_defaults module using `defaults: ["defaults_module_name"]`.  Each
diff --git a/java/java_test.go b/java/java_test.go
index 3a7ed4e..a98ea84 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -105,6 +105,7 @@
 	ctx.RegisterModuleType("cc_object", android.ModuleFactoryAdaptor(cc.ObjectFactory))
 	ctx.RegisterModuleType("toolchain_library", android.ModuleFactoryAdaptor(cc.ToolchainLibraryFactory))
 	ctx.RegisterModuleType("llndk_library", android.ModuleFactoryAdaptor(cc.LlndkLibraryFactory))
+	ctx.RegisterModuleType("ndk_prebuilt_shared_stl", android.ModuleFactoryAdaptor(cc.NdkPrebuiltSharedStlFactory))
 	ctx.PreDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.BottomUp("link", cc.LinkageMutator).Parallel()
 		ctx.BottomUp("begin", cc.BeginMutator).Parallel()
@@ -120,6 +121,10 @@
 		"b.kt":                   nil,
 		"a.jar":                  nil,
 		"b.jar":                  nil,
+		"APP_NOTICE":             nil,
+		"GENRULE_NOTICE":         nil,
+		"LIB_NOTICE":             nil,
+		"TOOL_NOTICE":            nil,
 		"java-res/a/a":           nil,
 		"java-res/b/b":           nil,
 		"java-res2/a":            nil,
@@ -134,6 +139,8 @@
 		"api/test-removed.txt":   nil,
 		"framework/aidl/a.aidl":  nil,
 
+		"prebuilts/ndk/current/sources/cxx-stl/llvm-libc++/libs/arm64-v8a/libc++_shared.so": nil,
+
 		"prebuilts/sdk/14/public/android.jar":         nil,
 		"prebuilts/sdk/14/public/framework.aidl":      nil,
 		"prebuilts/sdk/14/system/android.jar":         nil,
@@ -209,7 +216,7 @@
 	setDexpreoptTestGlobalConfig(config, dexpreopt.GlobalConfigForTests(pathCtx))
 
 	ctx.Register()
-	_, errs := ctx.ParseFileList(".", []string{"Android.bp", "prebuilts/sdk/Android.bp"})
+	_, errs := ctx.ParseBlueprintsFiles("Android.bp")
 	android.FailIfErrored(t, errs)
 	_, errs = ctx.PrepareBuildActions(config)
 	android.FailIfErrored(t, errs)
@@ -839,6 +846,19 @@
 	}
 }
 
+func TestJavaLibrary(t *testing.T) {
+	config := testConfig(nil)
+	ctx := testContext(config, "", map[string][]byte{
+		"libcore/Android.bp": []byte(`
+				java_library {
+						name: "core",
+						sdk_version: "none",
+						system_modules: "none",
+				}`),
+	})
+	run(t, ctx, config)
+}
+
 func TestJavaSdkLibrary(t *testing.T) {
 	ctx := testJava(t, `
 		droiddoc_template {
@@ -997,7 +1017,7 @@
 		java_library {
 			name: "bar",
 			srcs: ["b.java"],
-			no_standard_libs: true,
+			sdk_version: "none",
 			system_modules: "none",
 			patch_module: "java.base",
 		}
diff --git a/java/kotlin.go b/java/kotlin.go
index 33167ba..8306907 100644
--- a/java/kotlin.go
+++ b/java/kotlin.go
@@ -44,6 +44,7 @@
 			"${config.KotlinScriptRuntimeJar}",
 			"${config.KotlinStdlibJar}",
 			"${config.KotlinTrove4jJar}",
+			"${config.KotlinAnnotationJar}",
 			"${config.GenKotlinBuildFileCmd}",
 			"${config.SoongZipCmd}",
 			"${config.ZipSyncCmd}",
diff --git a/java/robolectric.go b/java/robolectric.go
index b87ee0d..1de56a5 100644
--- a/java/robolectric.go
+++ b/java/robolectric.go
@@ -17,6 +17,7 @@
 import (
 	"fmt"
 	"io"
+	"strconv"
 	"strings"
 
 	"android/soong/android"
@@ -40,6 +41,9 @@
 	Test_options struct {
 		// Timeout in seconds when running the tests.
 		Timeout *int64
+
+		// Number of shards to use when running the tests.
+		Shards *int64
 	}
 }
 
@@ -48,7 +52,8 @@
 
 	robolectricProperties robolectricProperties
 
-	libs []string
+	libs  []string
+	tests []string
 }
 
 func (r *robolectricTest) DepsMutator(ctx android.BottomUpMutatorContext) {
@@ -69,6 +74,39 @@
 	for _, dep := range ctx.GetDirectDepsWithTag(libTag) {
 		r.libs = append(r.libs, ctx.OtherModuleName(dep))
 	}
+
+	// TODO: this could all be removed if tradefed was used as the test runner, it will find everything
+	// annotated as a test and run it.
+	for _, src := range r.compiledJavaSrcs {
+		s := src.Rel()
+		if !strings.HasSuffix(s, "Test.java") {
+			continue
+		} else if strings.HasSuffix(s, "/BaseRobolectricTest.java") {
+			continue
+		} else if strings.HasPrefix(s, "src/") {
+			s = strings.TrimPrefix(s, "src/")
+		}
+		r.tests = append(r.tests, s)
+	}
+}
+
+func shardTests(paths []string, shards int) [][]string {
+	if shards > len(paths) {
+		shards = len(paths)
+	}
+	if shards == 0 {
+		return nil
+	}
+	ret := make([][]string, 0, shards)
+	shardSize := (len(paths) + shards - 1) / shards
+	for len(paths) > shardSize {
+		ret = append(ret, paths[0:shardSize])
+		paths = paths[shardSize:]
+	}
+	if len(paths) > 0 {
+		ret = append(ret, paths)
+	}
+	return ret
 }
 
 func (r *robolectricTest) AndroidMk() android.AndroidMkData {
@@ -77,24 +115,50 @@
 	data.Custom = func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
 		android.WriteAndroidMkData(w, data)
 
-		fmt.Fprintln(w, "")
-		fmt.Fprintln(w, "include $(CLEAR_VARS)")
-		fmt.Fprintln(w, "LOCAL_MODULE := Run"+name)
-		fmt.Fprintln(w, "LOCAL_JAVA_LIBRARIES :=", name)
-		fmt.Fprintln(w, "LOCAL_JAVA_LIBRARIES += ", strings.Join(r.libs, " "))
-		fmt.Fprintln(w, "LOCAL_TEST_PACKAGE :=", String(r.robolectricProperties.Instrumentation_for))
-		if t := r.robolectricProperties.Test_options.Timeout; t != nil {
-			fmt.Fprintln(w, "LOCAL_ROBOTEST_TIMEOUT :=", *t)
+		if s := r.robolectricProperties.Test_options.Shards; s != nil && *s > 1 {
+			shards := shardTests(r.tests, int(*s))
+			for i, shard := range shards {
+				r.writeTestRunner(w, name, "Run"+name+strconv.Itoa(i), shard)
+			}
+
+			// TODO: add rules to dist the outputs of the individual tests, or combine them together?
+			fmt.Fprintln(w, "")
+			fmt.Fprintln(w, ".PHONY:", "Run"+name)
+			fmt.Fprintln(w, "Run"+name, ": \\")
+			for i := range shards {
+				fmt.Fprintln(w, "   ", "Run"+name+strconv.Itoa(i), "\\")
+			}
+			fmt.Fprintln(w, "")
+		} else {
+			r.writeTestRunner(w, name, "Run"+name, r.tests)
 		}
-		fmt.Fprintln(w, "-include external/robolectric-shadows/run_robotests.mk")
 	}
 
 	return data
 }
 
+func (r *robolectricTest) writeTestRunner(w io.Writer, module, name string, tests []string) {
+	fmt.Fprintln(w, "")
+	fmt.Fprintln(w, "include $(CLEAR_VARS)")
+	fmt.Fprintln(w, "LOCAL_MODULE :=", name)
+	fmt.Fprintln(w, "LOCAL_JAVA_LIBRARIES :=", module)
+	fmt.Fprintln(w, "LOCAL_JAVA_LIBRARIES += ", strings.Join(r.libs, " "))
+	fmt.Fprintln(w, "LOCAL_TEST_PACKAGE :=", String(r.robolectricProperties.Instrumentation_for))
+	fmt.Fprintln(w, "LOCAL_ROBOTEST_FILES :=", strings.Join(tests, " "))
+	if t := r.robolectricProperties.Test_options.Timeout; t != nil {
+		fmt.Fprintln(w, "LOCAL_ROBOTEST_TIMEOUT :=", *t)
+	}
+	fmt.Fprintln(w, "-include external/robolectric-shadows/run_robotests.mk")
+
+}
+
 // An android_robolectric_test module compiles tests against the Robolectric framework that can run on the local host
 // instead of on a device.  It also generates a rule with the name of the module prefixed with "Run" that can be
 // used to run the tests.  Running the tests with build rule will eventually be deprecated and replaced with atest.
+//
+// The test runner considers any file listed in srcs whose name ends with Test.java to be a test class, unless
+// it is named BaseRobolectricTest.java.  The path to the each source file must exactly match the package
+// name, or match the package name when the prefix "src/" is removed.
 func RobolectricTestFactory() android.Module {
 	module := &robolectricTest{}
 
diff --git a/java/robolectric_test.go b/java/robolectric_test.go
new file mode 100644
index 0000000..e89c6e7
--- /dev/null
+++ b/java/robolectric_test.go
@@ -0,0 +1,88 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package java
+
+import (
+	"reflect"
+	"testing"
+)
+
+func Test_shardTests(t *testing.T) {
+	type args struct {
+		paths  []string
+		shards int
+	}
+	tests := []struct {
+		name string
+		args args
+		want [][]string
+	}{
+		{
+			name: "empty",
+			args: args{
+				paths:  nil,
+				shards: 1,
+			},
+			want: [][]string(nil),
+		},
+		{
+			name: "too many shards",
+			args: args{
+				paths:  []string{"a", "b"},
+				shards: 3,
+			},
+			want: [][]string{{"a"}, {"b"}},
+		},
+		{
+			name: "single shard",
+			args: args{
+				paths:  []string{"a", "b"},
+				shards: 1,
+			},
+			want: [][]string{{"a", "b"}},
+		},
+		{
+			name: "shard per input",
+			args: args{
+				paths:  []string{"a", "b", "c"},
+				shards: 3,
+			},
+			want: [][]string{{"a"}, {"b"}, {"c"}},
+		},
+		{
+			name: "balanced shards",
+			args: args{
+				paths:  []string{"a", "b", "c", "d"},
+				shards: 2,
+			},
+			want: [][]string{{"a", "b"}, {"c", "d"}},
+		},
+		{
+			name: "unbalanced shards",
+			args: args{
+				paths:  []string{"a", "b", "c"},
+				shards: 2,
+			},
+			want: [][]string{{"a", "b"}, {"c"}},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := shardTests(tt.args.paths, tt.args.shards); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("shardTests() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/java/sdk.go b/java/sdk.go
index e93f8fb..7b79a49 100644
--- a/java/sdk.go
+++ b/java/sdk.go
@@ -38,7 +38,7 @@
 var apiFingerprintPathKey = android.NewOnceKey("apiFingerprintPathKey")
 
 type sdkContext interface {
-	// sdkVersion eturns the sdk_version property of the current module, or an empty string if it is not set.
+	// sdkVersion returns the sdk_version property of the current module, or an empty string if it is not set.
 	sdkVersion() string
 	// minSdkVersion returns the min_sdk_version property of the current module, or sdkVersion() if it is not set.
 	minSdkVersion() string
@@ -46,9 +46,9 @@
 	targetSdkVersion() string
 }
 
-func sdkVersionOrDefault(ctx android.BaseContext, v string) string {
+func sdkVersionOrDefault(ctx android.BaseModuleContext, v string) string {
 	switch v {
-	case "", "current", "system_current", "test_current", "core_current":
+	case "", "none", "current", "test_current", "system_current", "core_current", "core_platform":
 		return ctx.Config().DefaultAppTargetSdk()
 	default:
 		return v
@@ -57,9 +57,9 @@
 
 // Returns a sdk version as a number.  For modules targeting an unreleased SDK (meaning it does not yet have a number)
 // it returns android.FutureApiLevel (10000).
-func sdkVersionToNumber(ctx android.BaseContext, v string) (int, error) {
+func sdkVersionToNumber(ctx android.BaseModuleContext, v string) (int, error) {
 	switch v {
-	case "", "current", "test_current", "system_current", "core_current":
+	case "", "none", "current", "test_current", "system_current", "core_current", "core_platform":
 		return ctx.Config().DefaultAppTargetSdkInt(), nil
 	default:
 		n := android.GetNumericSdkVersion(v)
@@ -71,7 +71,7 @@
 	}
 }
 
-func sdkVersionToNumberAsString(ctx android.BaseContext, v string) (string, error) {
+func sdkVersionToNumberAsString(ctx android.BaseModuleContext, v string) (string, error) {
 	n, err := sdkVersionToNumber(ctx, v)
 	if err != nil {
 		return "", err
@@ -79,8 +79,9 @@
 	return strconv.Itoa(n), nil
 }
 
-func decodeSdkDep(ctx android.BaseContext, sdkContext sdkContext) sdkDep {
+func decodeSdkDep(ctx android.BaseModuleContext, sdkContext sdkContext) sdkDep {
 	v := sdkContext.sdkVersion()
+
 	// For PDK builds, use the latest SDK version instead of "current"
 	if ctx.Config().IsPdkBuild() && (v == "" || v == "current") {
 		sdkVersions := ctx.Config().Get(sdkVersionsKey).([]int)
@@ -151,9 +152,9 @@
 		}
 
 		if m == "core.current.stubs" {
-			ret.systemModules = "core-system-modules"
-		} else if m == "core.platform.api.stubs" {
-			ret.systemModules = "core-platform-api-stubs-system-modules"
+			ret.systemModules = "core-current-stubs-system-modules"
+			// core_current does not include framework classes.
+			ret.noFrameworksLibs = true
 		}
 		return ret
 	}
@@ -173,7 +174,8 @@
 		}
 	}
 
-	if ctx.Config().UnbundledBuildUsePrebuiltSdks() && v != "" {
+	if ctx.Config().UnbundledBuildUsePrebuiltSdks() &&
+		v != "" && v != "none" && v != "core_platform" {
 		return toPrebuilt(v)
 	}
 
@@ -183,6 +185,16 @@
 			useDefaultLibs:     true,
 			frameworkResModule: "framework-res",
 		}
+	case "none":
+		return sdkDep{
+			noStandardLibs: true,
+		}
+	case "core_platform":
+		return sdkDep{
+			useDefaultLibs:     true,
+			frameworkResModule: "framework-res",
+			noFrameworksLibs:   true,
+		}
 	case "current":
 		return toModule("android_stubs_current", "framework-res", sdkFrameworkAidlPath(ctx))
 	case "system_current":
diff --git a/java/sdk_library.go b/java/sdk_library.go
index 5b65c0c..b4a3f29 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -159,7 +159,8 @@
 	ctx.AddVariationDependencies(nil, publicApiStubsTag, module.stubsName(apiScopePublic))
 	ctx.AddVariationDependencies(nil, publicApiFileTag, module.docsName(apiScopePublic))
 
-	if !Bool(module.properties.No_standard_libs) {
+	sdkDep := decodeSdkDep(ctx, sdkContext(&module.Library))
+	if sdkDep.hasStandardLibs() {
 		ctx.AddVariationDependencies(nil, systemApiStubsTag, module.stubsName(apiScopeSystem))
 		ctx.AddVariationDependencies(nil, systemApiFileTag, module.docsName(apiScopeSystem))
 		ctx.AddVariationDependencies(nil, testApiFileTag, module.docsName(apiScopeTest))
@@ -384,7 +385,6 @@
 		Device_specific   *bool
 		Product_specific  *bool
 		Compile_dex       *bool
-		No_standard_libs  *bool
 		System_modules    *string
 		Java_version      *string
 		Product_variables struct {
@@ -401,17 +401,22 @@
 		}
 	}{}
 
+	sdkVersion := module.sdkVersion(apiScope)
+	sdkDep := decodeSdkDep(mctx, sdkContext(&module.Library))
+	if !sdkDep.hasStandardLibs() {
+		sdkVersion = "none"
+	}
+
 	props.Name = proptools.StringPtr(module.stubsName(apiScope))
 	// sources are generated from the droiddoc
 	props.Srcs = []string{":" + module.docsName(apiScope)}
-	props.Sdk_version = proptools.StringPtr(module.sdkVersion(apiScope))
+	props.Sdk_version = proptools.StringPtr(sdkVersion)
 	props.Libs = module.sdkLibraryProperties.Stub_only_libs
 	// Unbundled apps will use the prebult one from /prebuilts/sdk
 	if mctx.Config().UnbundledBuildUsePrebuiltSdks() {
 		props.Product_variables.Unbundled_build.Enabled = proptools.BoolPtr(false)
 	}
 	props.Product_variables.Pdk.Enabled = proptools.BoolPtr(false)
-	props.No_standard_libs = module.Library.Module.properties.No_standard_libs
 	props.System_modules = module.Library.Module.deviceProperties.System_modules
 	props.Openjdk9.Srcs = module.Library.Module.properties.Openjdk9.Srcs
 	props.Openjdk9.Javacflags = module.Library.Module.properties.Openjdk9.Javacflags
@@ -441,13 +446,13 @@
 		Srcs_lib                         *string
 		Srcs_lib_whitelist_dirs          []string
 		Srcs_lib_whitelist_pkgs          []string
+		Sdk_version                      *string
 		Libs                             []string
 		Arg_files                        []string
 		Args                             *string
 		Api_tag_name                     *string
 		Api_filename                     *string
 		Removed_api_filename             *string
-		No_standard_libs                 *bool
 		Java_version                     *string
 		Merge_annotations_dirs           []string
 		Merge_inclusion_annotations_dirs []string
@@ -462,9 +467,16 @@
 		}
 	}{}
 
+	sdkDep := decodeSdkDep(mctx, sdkContext(&module.Library))
+	sdkVersion := ""
+	if !sdkDep.hasStandardLibs() {
+		sdkVersion = "none"
+	}
+
 	props.Name = proptools.StringPtr(module.docsName(apiScope))
 	props.Srcs = append(props.Srcs, module.Library.Module.properties.Srcs...)
 	props.Srcs = append(props.Srcs, module.sdkLibraryProperties.Api_srcs...)
+	props.Sdk_version = proptools.StringPtr(sdkVersion)
 	props.Installable = proptools.BoolPtr(false)
 	// A droiddoc module has only one Libs property and doesn't distinguish between
 	// shared libs and static libs. So we need to add both of these libs to Libs property.
@@ -472,7 +484,6 @@
 	props.Libs = append(props.Libs, module.Library.Module.properties.Static_libs...)
 	props.Aidl.Include_dirs = module.Library.Module.deviceProperties.Aidl.Include_dirs
 	props.Aidl.Local_include_dirs = module.Library.Module.deviceProperties.Aidl.Local_include_dirs
-	props.No_standard_libs = module.Library.Module.properties.No_standard_libs
 	props.Java_version = module.Library.Module.properties.Java_version
 
 	props.Merge_annotations_dirs = module.sdkLibraryProperties.Merge_annotations_dirs
@@ -591,9 +602,9 @@
 	mctx.CreateModule(android.ModuleFactoryAdaptor(android.PrebuiltEtcFactory), &etcProps)
 }
 
-func (module *SdkLibrary) PrebuiltJars(ctx android.BaseContext, sdkVersion string) android.Paths {
+func (module *SdkLibrary) PrebuiltJars(ctx android.BaseModuleContext, sdkVersion string) android.Paths {
 	var api, v string
-	if sdkVersion == "" {
+	if sdkVersion == "" || sdkVersion == "none" {
 		api = "system"
 		v = "current"
 	} else if strings.Contains(sdkVersion, "_") {
@@ -615,7 +626,7 @@
 }
 
 // to satisfy SdkLibraryDependency interface
-func (module *SdkLibrary) SdkHeaderJars(ctx android.BaseContext, sdkVersion string) android.Paths {
+func (module *SdkLibrary) SdkHeaderJars(ctx android.BaseModuleContext, sdkVersion string) android.Paths {
 	// This module is just a wrapper for the stubs.
 	if ctx.Config().UnbundledBuildUsePrebuiltSdks() {
 		return module.PrebuiltJars(ctx, sdkVersion)
@@ -631,7 +642,7 @@
 }
 
 // to satisfy SdkLibraryDependency interface
-func (module *SdkLibrary) SdkImplementationJars(ctx android.BaseContext, sdkVersion string) android.Paths {
+func (module *SdkLibrary) SdkImplementationJars(ctx android.BaseModuleContext, sdkVersion string) android.Paths {
 	// This module is just a wrapper for the stubs.
 	if ctx.Config().UnbundledBuildUsePrebuiltSdks() {
 		return module.PrebuiltJars(ctx, sdkVersion)
@@ -701,7 +712,8 @@
 	module.createStubsLibrary(mctx, apiScopePublic)
 	module.createDocs(mctx, apiScopePublic)
 
-	if !Bool(module.properties.No_standard_libs) {
+	sdkDep := decodeSdkDep(mctx, sdkContext(&module.Library))
+	if sdkDep.hasStandardLibs() {
 		// for system API stubs
 		module.createStubsLibrary(mctx, apiScopeSystem)
 		module.createDocs(mctx, apiScopeSystem)
@@ -840,13 +852,13 @@
 }
 
 // to satisfy SdkLibraryDependency interface
-func (module *sdkLibraryImport) SdkHeaderJars(ctx android.BaseContext, sdkVersion string) android.Paths {
+func (module *sdkLibraryImport) SdkHeaderJars(ctx android.BaseModuleContext, sdkVersion string) android.Paths {
 	// This module is just a wrapper for the prebuilt stubs.
 	return module.stubsPath
 }
 
 // to satisfy SdkLibraryDependency interface
-func (module *sdkLibraryImport) SdkImplementationJars(ctx android.BaseContext, sdkVersion string) android.Paths {
+func (module *sdkLibraryImport) SdkImplementationJars(ctx android.BaseModuleContext, sdkVersion string) android.Paths {
 	// This module is just a wrapper for the stubs.
 	return module.stubsPath
 }
diff --git a/java/sdk_test.go b/java/sdk_test.go
index cc4da2e..f82a4fb 100644
--- a/java/sdk_test.go
+++ b/java/sdk_test.go
@@ -47,6 +47,14 @@
 			aidl:          "-Iframework/aidl",
 		},
 		{
+			name:          `sdk_version:"core_platform"`,
+			properties:    `sdk_version:"core_platform"`,
+			bootclasspath: config.DefaultBootclasspathLibraries,
+			system:        config.DefaultSystemModules,
+			classpath:     []string{},
+			aidl:          "",
+		},
+		{
 			name:          "blank sdk version",
 			properties:    `sdk_version: "",`,
 			bootclasspath: config.DefaultBootclasspathLibraries,
@@ -106,7 +114,7 @@
 		{
 
 			name:          "nostdlib",
-			properties:    `no_standard_libs: true, system_modules: "none"`,
+			properties:    `sdk_version: "none", system_modules: "none"`,
 			system:        "none",
 			bootclasspath: []string{`""`},
 			classpath:     []string{},
@@ -114,7 +122,7 @@
 		{
 
 			name:          "nostdlib system_modules",
-			properties:    `no_standard_libs: true, system_modules: "core-platform-api-stubs-system-modules"`,
+			properties:    `sdk_version: "none", system_modules: "core-platform-api-stubs-system-modules"`,
 			system:        "core-platform-api-stubs-system-modules",
 			bootclasspath: []string{`""`},
 			classpath:     []string{},
@@ -129,13 +137,6 @@
 			classpath:     []string{},
 		},
 		{
-			name:       "host nostdlib",
-			moduleType: "java_library_host",
-			host:       android.Host,
-			properties: `no_standard_libs: true`,
-			classpath:  []string{},
-		},
-		{
 
 			name:          "host supported default",
 			host:          android.Host,
@@ -146,7 +147,7 @@
 		{
 			name:       "host supported nostdlib",
 			host:       android.Host,
-			properties: `host_supported: true, no_standard_libs: true, system_modules: "none"`,
+			properties: `host_supported: true, sdk_version: "none", system_modules: "none"`,
 			classpath:  []string{},
 		},
 		{
@@ -245,7 +246,7 @@
 			if testcase.system == "none" {
 				system = "--system=none"
 			} else if testcase.system != "" {
-				system = "--system=" + filepath.Join(buildDir, ".intermediates", testcase.system, "android_common", "system") + "/"
+				system = "--system=" + filepath.Join(buildDir, ".intermediates", testcase.system, "android_common", "system")
 			}
 
 			checkClasspath := func(t *testing.T, ctx *android.TestContext) {
diff --git a/java/system_modules.go b/java/system_modules.go
index 8005360..c616249 100644
--- a/java/system_modules.go
+++ b/java/system_modules.go
@@ -42,7 +42,11 @@
 			`${config.MergeZipsCmd} -j ${workDir}/module.jar ${workDir}/classes.jar $in && ` +
 			`${config.JmodCmd} create --module-version 9 --target-platform android ` +
 			`  --class-path ${workDir}/module.jar ${workDir}/jmod/${moduleName}.jmod && ` +
-			`${config.JlinkCmd} --module-path ${workDir}/jmod --add-modules ${moduleName} --output ${outDir} && ` +
+			`${config.JlinkCmd} --module-path ${workDir}/jmod --add-modules ${moduleName} --output ${outDir} ` +
+			// Note: The system-modules jlink plugin is disabled because (a) it is not
+			// useful on Android, and (b) it causes errors with later versions of jlink
+			// when the jdk.internal.module is absent from java.base (as it is here).
+			`  --disable-plugin system-modules && ` +
 			`cp ${config.JrtFsJar} ${outDir}/lib/`,
 		CommandDeps: []string{
 			"${moduleInfoJavaPath}",
@@ -57,7 +61,7 @@
 		"moduleName", "classpath", "outDir", "workDir")
 )
 
-func TransformJarsToSystemModules(ctx android.ModuleContext, moduleName string, jars android.Paths) android.WritablePath {
+func TransformJarsToSystemModules(ctx android.ModuleContext, moduleName string, jars android.Paths) (android.Path, android.Paths) {
 	outDir := android.PathForModuleOut(ctx, "system")
 	workDir := android.PathForModuleOut(ctx, "modules")
 	outputFile := android.PathForModuleOut(ctx, "system/lib/modules")
@@ -80,7 +84,7 @@
 		},
 	})
 
-	return outputFile
+	return outDir, outputs.Paths()
 }
 
 func SystemModulesFactory() android.Module {
@@ -97,18 +101,13 @@
 
 	properties SystemModulesProperties
 
-	outputFile android.Path
+	outputDir  android.Path
+	outputDeps android.Paths
 }
 
 type SystemModulesProperties struct {
 	// List of java library modules that should be included in the system modules
 	Libs []string
-
-	// List of prebuilt jars that should be included in the system modules
-	Jars []string
-
-	// Sdk version that should be included in the system modules
-	Sdk_version *string
 }
 
 func (system *SystemModules) GenerateAndroidBuildActions(ctx android.ModuleContext) {
@@ -119,9 +118,7 @@
 		jars = append(jars, dep.HeaderJars()...)
 	})
 
-	jars = append(jars, android.PathsForModuleSrc(ctx, system.properties.Jars)...)
-
-	system.outputFile = TransformJarsToSystemModules(ctx, "java.base", jars)
+	system.outputDir, system.outputDeps = TransformJarsToSystemModules(ctx, "java.base", jars)
 }
 
 func (system *SystemModules) DepsMutator(ctx android.BottomUpMutatorContext) {
@@ -131,16 +128,22 @@
 func (system *SystemModules) AndroidMk() android.AndroidMkData {
 	return android.AndroidMkData{
 		Custom: func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
-			makevar := "SOONG_SYSTEM_MODULES_" + name
 			fmt.Fprintln(w)
-			fmt.Fprintln(w, makevar, ":=", system.outputFile.String())
-			fmt.Fprintln(w, ".KATI_READONLY", ":=", makevar)
+
+			makevar := "SOONG_SYSTEM_MODULES_" + name
+			fmt.Fprintln(w, makevar, ":=$=", system.outputDir.String())
+			fmt.Fprintln(w)
+
+			makevar = "SOONG_SYSTEM_MODULES_LIBS_" + name
+			fmt.Fprintln(w, makevar, ":=$=", strings.Join(system.properties.Libs, " "))
+			fmt.Fprintln(w)
+
+			makevar = "SOONG_SYSTEM_MODULES_DEPS_" + name
+			fmt.Fprintln(w, makevar, ":=$=", strings.Join(system.outputDeps.Strings(), " "))
+			fmt.Fprintln(w)
+
 			fmt.Fprintln(w, name+":", "$("+makevar+")")
 			fmt.Fprintln(w, ".PHONY:", name)
-			fmt.Fprintln(w)
-			makevar = "SOONG_SYSTEM_MODULES_LIBS_" + name
-			fmt.Fprintln(w, makevar, ":=", strings.Join(system.properties.Libs, " "))
-			fmt.Fprintln(w, ".KATI_READONLY :=", makevar)
 		},
 	}
 }
diff --git a/java/testing.go b/java/testing.go
index fc7842d..5d116a7 100644
--- a/java/testing.go
+++ b/java/testing.go
@@ -54,8 +54,7 @@
 			java_library {
 				name: "%s",
 				srcs: ["a.java"],
-				no_standard_libs: true,
-				sdk_version: "core_current",
+				sdk_version: "none",
 				system_modules: "core-platform-api-stubs-system-modules",
 			}
 		`, extra)
@@ -65,8 +64,7 @@
 		java_library {
 			name: "framework",
 			srcs: ["a.java"],
-			no_standard_libs: true,
-			sdk_version: "core_current",
+			sdk_version: "none",
 			system_modules: "core-platform-api-stubs-system-modules",
 			aidl: {
 				export_include_dirs: ["framework/aidl"],
@@ -75,14 +73,13 @@
 
 		android_app {
 			name: "framework-res",
-			no_framework_libs: true,
+			sdk_version: "core_platform",
 		}
 
 		java_library {
 			name: "android.hidl.base-V1.0-java",
 			srcs: ["a.java"],
-			no_standard_libs: true,
-			sdk_version: "core_current",
+			sdk_version: "none",
 			system_modules: "core-platform-api-stubs-system-modules",
 			installable: true,
 		}
@@ -90,8 +87,7 @@
 		java_library {
 			name: "android.hidl.manager-V1.0-java",
 			srcs: ["a.java"],
-			no_standard_libs: true,
-			sdk_version: "core_current",
+			sdk_version: "none",
 			system_modules: "core-platform-api-stubs-system-modules",
 			installable: true,
 		}
@@ -99,8 +95,7 @@
 		java_library {
 			name: "org.apache.http.legacy",
 			srcs: ["a.java"],
-			no_standard_libs: true,
-			sdk_version: "core_current",
+			sdk_version: "none",
 			system_modules: "core-platform-api-stubs-system-modules",
 			installable: true,
 		}
@@ -108,6 +103,7 @@
 
 	systemModules := []string{
 		"core-system-modules",
+		"core-current-stubs-system-modules",
 		"core-platform-api-stubs-system-modules",
 		"android_stubs_current_system_modules",
 		"android_system_stubs_current_system_modules",
diff --git a/scripts/manifest_fixer.py b/scripts/manifest_fixer.py
index bb14851..945bc18 100755
--- a/scripts/manifest_fixer.py
+++ b/scripts/manifest_fixer.py
@@ -59,6 +59,9 @@
                       default=None, type=lambda x: (str(x).lower() == 'true'),
                       help=('specify if the app wants to use embedded native libraries. Must not conflict '
                             'if already declared in the manifest.'))
+  parser.add_argument('--has-no-code', dest='has_no_code', action='store_true',
+                      help=('adds hasCode="false" attribute to application. Ignored if application elem '
+                            'already has a hasCode attribute.'))
   parser.add_argument('input', help='input AndroidManifest.xml file')
   parser.add_argument('output', help='output AndroidManifest.xml file')
   return parser.parse_args()
@@ -245,6 +248,28 @@
                        (attr.value, value))
 
 
+def set_has_code_to_false(doc):
+  manifest = parse_manifest(doc)
+  elems = get_children_with_tag(manifest, 'application')
+  application = elems[0] if len(elems) == 1 else None
+  if len(elems) > 1:
+    raise RuntimeError('found multiple <application> tags')
+  elif not elems:
+    application = doc.createElement('application')
+    indent = get_indent(manifest.firstChild, 1)
+    first = manifest.firstChild
+    manifest.insertBefore(doc.createTextNode(indent), first)
+    manifest.insertBefore(application, first)
+
+  attr = application.getAttributeNodeNS(android_ns, 'hasCode')
+  if attr is not None:
+    # Do nothing if the application already has a hasCode attribute.
+    return
+  attr = doc.createAttributeNS(android_ns, 'android:hasCode')
+  attr.value = 'false'
+  application.setAttributeNode(attr)
+
+
 def main():
   """Program entry point."""
   try:
@@ -269,6 +294,9 @@
     if args.use_embedded_dex:
       add_use_embedded_dex(doc)
 
+    if args.has_no_code:
+      set_has_code_to_false(doc)
+
     if args.extract_native_libs is not None:
       add_extract_native_libs(doc, args.extract_native_libs)
 
diff --git a/scripts/manifest_fixer_test.py b/scripts/manifest_fixer_test.py
index 2035421..ea8095e 100755
--- a/scripts/manifest_fixer_test.py
+++ b/scripts/manifest_fixer_test.py
@@ -424,5 +424,47 @@
     self.assertRaises(RuntimeError, self.run_test, manifest_input, False)
 
 
+class AddNoCodeApplicationTest(unittest.TestCase):
+  """Unit tests for set_has_code_to_false function."""
+
+  def run_test(self, input_manifest):
+    doc = minidom.parseString(input_manifest)
+    manifest_fixer.set_has_code_to_false(doc)
+    output = StringIO.StringIO()
+    manifest_fixer.write_xml(output, doc)
+    return output.getvalue()
+
+  manifest_tmpl = (
+      '<?xml version="1.0" encoding="utf-8"?>\n'
+      '<manifest xmlns:android="http://schemas.android.com/apk/res/android">\n'
+      '%s'
+      '</manifest>\n')
+
+  def test_no_application(self):
+    manifest_input = self.manifest_tmpl % ''
+    expected = self.manifest_tmpl % '    <application android:hasCode="false"/>\n'
+    output = self.run_test(manifest_input)
+    self.assertEqual(output, expected)
+
+  def test_has_application_no_has_code(self):
+    manifest_input = self.manifest_tmpl % '    <application/>\n'
+    expected = self.manifest_tmpl % '    <application android:hasCode="false"/>\n'
+    output = self.run_test(manifest_input)
+    self.assertEqual(output, expected)
+
+  def test_has_application_has_code_false(self):
+    """ Do nothing if there's already an application elemeent. """
+    manifest_input = self.manifest_tmpl % '    <application android:hasCode="false"/>\n'
+    output = self.run_test(manifest_input)
+    self.assertEqual(output, manifest_input)
+
+  def test_has_application_has_code_true(self):
+    """ Do nothing if there's already an application elemeent even if its
+     hasCode attribute is true. """
+    manifest_input = self.manifest_tmpl % '    <application android:hasCode="true"/>\n'
+    output = self.run_test(manifest_input)
+    self.assertEqual(output, manifest_input)
+
+
 if __name__ == '__main__':
   unittest.main(verbosity=2)
diff --git a/scripts/system-clang-format b/scripts/system-clang-format
index 55773a2..14abd93 100644
--- a/scripts/system-clang-format
+++ b/scripts/system-clang-format
@@ -4,6 +4,7 @@
 ColumnLimit: 100
 CommentPragmas: NOLINT:.*
 DerivePointerAlignment: false
+IncludeBlocks: Preserve
 IndentWidth: 4
 ContinuationIndentWidth: 8
 PointerAlignment: Left
diff --git a/scripts/system-clang-format-2 b/scripts/system-clang-format-2
index ede5d7e..e28b379 100644
--- a/scripts/system-clang-format-2
+++ b/scripts/system-clang-format-2
@@ -3,6 +3,7 @@
 ColumnLimit: 100
 CommentPragmas: NOLINT:.*
 DerivePointerAlignment: false
+IncludeBlocks: Preserve
 IndentWidth: 2
 PointerAlignment: Left
 TabWidth: 2
diff --git a/sysprop/sysprop_library.go b/sysprop/sysprop_library.go
index 3f2709e..86061c6 100644
--- a/sysprop/sysprop_library.go
+++ b/sysprop/sysprop_library.go
@@ -123,6 +123,8 @@
 		Sysprop          struct {
 			Platform *bool
 		}
+		Header_libs []string
+		Shared_libs []string
 	}{}
 
 	ccProps.Name = proptools.StringPtr(m.CcModuleName())
@@ -130,6 +132,8 @@
 	ccProps.Device_specific = proptools.BoolPtr(deviceSpecific)
 	ccProps.Product_specific = proptools.BoolPtr(productSpecific)
 	ccProps.Sysprop.Platform = proptools.BoolPtr(owner == "Platform")
+	ccProps.Header_libs = []string{"libbase_headers"}
+	ccProps.Shared_libs = []string{"liblog"}
 
 	ctx.CreateModule(android.ModuleFactoryAdaptor(cc.LibraryFactory), &m.commonProperties, &ccProps)
 }
diff --git a/sysprop/sysprop_test.go b/sysprop/sysprop_test.go
index d78238a..0566036 100644
--- a/sysprop/sysprop_test.go
+++ b/sysprop/sysprop_test.go
@@ -278,7 +278,7 @@
 
 		cc_library {
 			name: "liblog",
-			no_libgcc: true,
+			no_libcrt: true,
 			nocrt: true,
 			system_shared_libs: [],
 			recovery_available: true,
@@ -313,13 +313,13 @@
 	vendorVariant := "android_arm64_armv8-a_vendor_static"
 
 	platformInternalPath := "libsysprop-platform/android_arm64_armv8-a_core_static/gen/sysprop/include"
-	platformSystemCorePath := "libsysprop-platform/android_arm64_armv8-a_core_static/gen/sysprop/system/include"
-	platformSystemVendorPath := "libsysprop-platform/android_arm64_armv8-a_vendor_static/gen/sysprop/system/include"
+	platformPublicCorePath := "libsysprop-platform/android_arm64_armv8-a_core_static/gen/sysprop/public/include"
+	platformPublicVendorPath := "libsysprop-platform/android_arm64_armv8-a_vendor_static/gen/sysprop/public/include"
 
-	platformOnProductPath := "libsysprop-platform-on-product/android_arm64_armv8-a_core_static/gen/sysprop/system/include"
+	platformOnProductPath := "libsysprop-platform-on-product/android_arm64_armv8-a_core_static/gen/sysprop/public/include"
 
 	vendorInternalPath := "libsysprop-vendor/android_arm64_armv8-a_vendor_static/gen/sysprop/include"
-	vendorSystemPath := "libsysprop-vendor/android_arm64_armv8-a_core_static/gen/sysprop/system/include"
+	vendorPublicPath := "libsysprop-vendor/android_arm64_armv8-a_core_static/gen/sysprop/public/include"
 
 	platformClient := ctx.ModuleForTests("cc-client-platform", coreVariant)
 	platformFlags := platformClient.Rule("cc").Args["cFlags"]
@@ -342,20 +342,20 @@
 	productClient := ctx.ModuleForTests("cc-client-product", coreVariant)
 	productFlags := productClient.Rule("cc").Args["cFlags"]
 
-	// Product should use platform's and vendor's system headers
+	// Product should use platform's and vendor's public headers
 	if !strings.Contains(productFlags, platformOnProductPath) ||
-		!strings.Contains(productFlags, vendorSystemPath) {
+		!strings.Contains(productFlags, vendorPublicPath) {
 		t.Errorf("flags for product must contain %#v and %#v, but was %#v.",
-			platformSystemCorePath, vendorSystemPath, productFlags)
+			platformPublicCorePath, vendorPublicPath, productFlags)
 	}
 
 	vendorClient := ctx.ModuleForTests("cc-client-vendor", vendorVariant)
 	vendorFlags := vendorClient.Rule("cc").Args["cFlags"]
 
-	// Vendor should use platform's system header and vendor's internal header
-	if !strings.Contains(vendorFlags, platformSystemVendorPath) ||
+	// Vendor should use platform's public header and vendor's internal header
+	if !strings.Contains(vendorFlags, platformPublicVendorPath) ||
 		!strings.Contains(vendorFlags, vendorInternalPath) {
 		t.Errorf("flags for vendor must contain %#v and %#v, but was %#v.",
-			platformSystemVendorPath, vendorInternalPath, vendorFlags)
+			platformPublicVendorPath, vendorInternalPath, vendorFlags)
 	}
 }
diff --git a/tradefed/autogen.go b/tradefed/autogen.go
index da5dabe..952b022 100644
--- a/tradefed/autogen.go
+++ b/tradefed/autogen.go
@@ -16,7 +16,6 @@
 
 import (
 	"fmt"
-	"sort"
 	"strings"
 
 	"github.com/google/blueprint"
@@ -39,9 +38,9 @@
 }
 
 var autogenTestConfig = pctx.StaticRule("autogenTestConfig", blueprint.RuleParams{
-	Command:     "sed 's&{MODULE}&${name}&g;s&{EXTRA_OPTIONS}&'${extraOptions}'&g' $template > $out",
+	Command:     "sed 's&{MODULE}&${name}&g;s&{EXTRA_CONFIGS}&'${extraConfigs}'&g' $template > $out",
 	CommandDeps: []string{"$template"},
-}, "name", "template", "extraOptions")
+}, "name", "template", "extraConfigs")
 
 func testConfigPath(ctx android.ModuleContext, prop *string, testSuites []string) (path android.Path, autogenPath android.WritablePath) {
 	if p := getTestConfig(ctx, prop); p != nil {
@@ -57,17 +56,38 @@
 	}
 }
 
-func autogenTemplate(ctx android.ModuleContext, output android.WritablePath, template string, optionsMap map[string]string) {
-	// If no test option found, delete {EXTRA_OPTIONS} line.
-	var options []string
-	for optionName, value := range optionsMap {
-		if value != "" {
-			options = append(options, fmt.Sprintf(`<option name="%s" value="%s" />`, optionName, value))
-		}
+type Config interface {
+	Config() string
+}
+
+type Option struct {
+	Name  string
+	Value string
+}
+
+var _ Config = Option{}
+
+func (o Option) Config() string {
+	return fmt.Sprintf(`<option name="%s" value="%s" />`, o.Name, o.Value)
+}
+
+type Preparer struct {
+	Class string
+}
+
+var _ Config = Preparer{}
+
+func (p Preparer) Config() string {
+	return fmt.Sprintf(`<target_preparer class="%s" />`, p.Class)
+}
+
+func autogenTemplate(ctx android.ModuleContext, output android.WritablePath, template string, configs []Config) {
+	var configStrings []string
+	for _, config := range configs {
+		configStrings = append(configStrings, config.Config())
 	}
-	sort.Strings(options)
-	extraOptions := strings.Join(options, "\n        ")
-	extraOptions = proptools.NinjaAndShellEscape(extraOptions)
+	extraConfigs := strings.Join(configStrings, "\n        ")
+	extraConfigs = proptools.NinjaAndShellEscape(extraConfigs)
 
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        autogenTestConfig,
@@ -76,26 +96,23 @@
 		Args: map[string]string{
 			"name":         ctx.ModuleName(),
 			"template":     template,
-			"extraOptions": extraOptions,
+			"extraConfigs": extraConfigs,
 		},
 	})
 }
 
 func AutoGenNativeTestConfig(ctx android.ModuleContext, testConfigProp *string,
-	testConfigTemplateProp *string, testSuites []string,
-	optionsMap map[string]string) android.Path {
+	testConfigTemplateProp *string, testSuites []string, config []Config) android.Path {
 	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites)
 	if autogenPath != nil {
 		templatePath := getTestConfigTemplate(ctx, testConfigTemplateProp)
 		if templatePath.Valid() {
-			autogenTemplate(ctx, autogenPath, templatePath.String(), optionsMap)
+			autogenTemplate(ctx, autogenPath, templatePath.String(), config)
 		} else {
 			if ctx.Device() {
-				autogenTemplate(ctx, autogenPath, "${NativeTestConfigTemplate}",
-					optionsMap)
+				autogenTemplate(ctx, autogenPath, "${NativeTestConfigTemplate}", config)
 			} else {
-				autogenTemplate(ctx, autogenPath, "${NativeHostTestConfigTemplate}",
-					optionsMap)
+				autogenTemplate(ctx, autogenPath, "${NativeHostTestConfigTemplate}", config)
 			}
 		}
 		return autogenPath
@@ -104,14 +121,14 @@
 }
 
 func AutoGenNativeBenchmarkTestConfig(ctx android.ModuleContext, testConfigProp *string,
-	testConfigTemplateProp *string, testSuites []string) android.Path {
+	testConfigTemplateProp *string, testSuites []string, configs []Config) android.Path {
 	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites)
 	if autogenPath != nil {
 		templatePath := getTestConfigTemplate(ctx, testConfigTemplateProp)
 		if templatePath.Valid() {
-			autogenTemplate(ctx, autogenPath, templatePath.String(), nil)
+			autogenTemplate(ctx, autogenPath, templatePath.String(), configs)
 		} else {
-			autogenTemplate(ctx, autogenPath, "${NativeBenchmarkTestConfigTemplate}", nil)
+			autogenTemplate(ctx, autogenPath, "${NativeBenchmarkTestConfigTemplate}", configs)
 		}
 		return autogenPath
 	}
diff --git a/ui/build/config.go b/ui/build/config.go
index c298f00..4a70f06 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -61,6 +61,31 @@
 
 const srcDirFileCheck = "build/soong/root.bp"
 
+type BuildAction uint
+
+const (
+	// Builds all of the modules and their dependencies of a specified directory, relative to the root
+	// directory of the source tree.
+	BUILD_MODULES_IN_A_DIRECTORY BuildAction = iota
+
+	// Builds all of the modules and their dependencies of a list of specified directories. All specified
+	// directories are relative to the root directory of the source tree.
+	BUILD_MODULES_IN_DIRECTORIES
+
+	// Build a list of specified modules. If none was specified, simply build the whole source tree.
+	BUILD_MODULES
+)
+
+// checkTopDir validates that the current directory is at the root directory of the source tree.
+func checkTopDir(ctx Context) {
+	if _, err := os.Stat(srcDirFileCheck); err != nil {
+		if os.IsNotExist(err) {
+			ctx.Fatalf("Current working directory must be the source tree. %q not found.", srcDirFileCheck)
+		}
+		ctx.Fatalln("Error verifying tree state:", err)
+	}
+}
+
 func NewConfig(ctx Context, args ...string) Config {
 	ret := &configImpl{
 		environ: OsEnvironment(),
@@ -154,12 +179,7 @@
 	ret.environ.Set("TMPDIR", absPath(ctx, ret.TempDir()))
 
 	// Precondition: the current directory is the top of the source tree
-	if _, err := os.Stat(srcDirFileCheck); err != nil {
-		if os.IsNotExist(err) {
-			log.Fatalf("Current working directory must be the source tree. %q not found", srcDirFileCheck)
-		}
-		log.Fatalln("Error verifying tree state:", err)
-	}
+	checkTopDir(ctx)
 
 	if srcDir := absPath(ctx, "."); strings.ContainsRune(srcDir, ' ') {
 		log.Println("You are building in a directory whose absolute path contains a space character:")
@@ -229,6 +249,205 @@
 	return Config{ret}
 }
 
+// NewBuildActionConfig returns a build configuration based on the build action. The arguments are
+// processed based on the build action and extracts any arguments that belongs to the build action.
+func NewBuildActionConfig(action BuildAction, dir string, buildDependencies bool, ctx Context, args ...string) Config {
+	return NewConfig(ctx, getConfigArgs(action, dir, buildDependencies, ctx, args)...)
+}
+
+// getConfigArgs processes the command arguments based on the build action and creates a set of new
+// arguments to be accepted by Config.
+func getConfigArgs(action BuildAction, dir string, buildDependencies bool, ctx Context, args []string) []string {
+	// The next block of code verifies that the current directory is the root directory of the source
+	// tree. It then finds the relative path of dir based on the root directory of the source tree
+	// and verify that dir is inside of the source tree.
+	checkTopDir(ctx)
+	topDir, err := os.Getwd()
+	if err != nil {
+		ctx.Fatalf("Error retrieving top directory: %v", err)
+	}
+	dir, err = filepath.Abs(dir)
+	if err != nil {
+		ctx.Fatalf("Unable to find absolute path %s: %v", dir, err)
+	}
+	relDir, err := filepath.Rel(topDir, dir)
+	if err != nil {
+		ctx.Fatalf("Unable to find relative path %s of %s: %v", relDir, topDir, err)
+	}
+	// If there are ".." in the path, it's not in the source tree.
+	if strings.Contains(relDir, "..") {
+		ctx.Fatalf("Directory %s is not under the source tree %s", dir, topDir)
+	}
+
+	configArgs := args[:]
+
+	// If the arguments contains GET-INSTALL-PATH, change the target name prefix from MODULES-IN- to
+	// GET-INSTALL-PATH-IN- to extract the installation path instead of building the modules.
+	targetNamePrefix := "MODULES-IN-"
+	if inList("GET-INSTALL-PATH", configArgs) {
+		targetNamePrefix = "GET-INSTALL-PATH-IN-"
+		configArgs = removeFromList("GET-INSTALL-PATH", configArgs)
+	}
+
+	var buildFiles []string
+	var targets []string
+
+	switch action {
+	case BUILD_MODULES:
+		// No additional processing is required when building a list of specific modules or all modules.
+	case BUILD_MODULES_IN_A_DIRECTORY:
+		// If dir is the root source tree, all the modules are built of the source tree are built so
+		// no need to find the build file.
+		if topDir == dir {
+			break
+		}
+		// Find the build file from the directory where the build action was triggered by traversing up
+		// the source tree. If a blank build filename is returned, simply use the directory where the build
+		// action was invoked.
+		buildFile := findBuildFile(ctx, relDir)
+		if buildFile == "" {
+			buildFile = filepath.Join(relDir, "Android.mk")
+		}
+		buildFiles = []string{buildFile}
+		targets = []string{convertToTarget(filepath.Dir(buildFile), targetNamePrefix)}
+	case BUILD_MODULES_IN_DIRECTORIES:
+		newConfigArgs, dirs := splitArgs(configArgs)
+		configArgs = newConfigArgs
+		targets, buildFiles = getTargetsFromDirs(ctx, relDir, dirs, targetNamePrefix)
+	}
+
+	// This is to support building modules without building their dependencies. Soon, this will be
+	// deprecated.
+	if !buildDependencies && len(buildFiles) > 0 {
+		if err := os.Setenv("ONE_SHOT_MAKEFILE", strings.Join(buildFiles, " ")); err != nil {
+			ctx.Fatalf("Unable to set ONE_SHOT_MAKEFILE environment variable: %v", err)
+		}
+	}
+
+	// Tidy only override all other specified targets.
+	tidyOnly := os.Getenv("WITH_TIDY_ONLY")
+	if tidyOnly == "true" || tidyOnly == "1" {
+		configArgs = append(configArgs, "tidy_only")
+	} else {
+		configArgs = append(configArgs, targets...)
+	}
+
+	return configArgs
+}
+
+// convertToTarget replaces "/" to "-" in dir and pre-append the targetNamePrefix to the target name.
+func convertToTarget(dir string, targetNamePrefix string) string {
+	return targetNamePrefix + strings.ReplaceAll(dir, "/", "-")
+}
+
+// findBuildFile finds a build file (makefile or blueprint file) by looking at dir first. If not
+// found, go up one level and repeat again until one is found and the path of that build file
+// relative to the root directory of the source tree is returned. The returned filename of build
+// file is "Android.mk". If one was not found, a blank string is returned.
+func findBuildFile(ctx Context, dir string) string {
+	// If the string is empty, assume it is top directory of the source tree.
+	if dir == "" {
+		return ""
+	}
+
+	for ; dir != "."; dir = filepath.Dir(dir) {
+		for _, buildFile := range []string{"Android.bp", "Android.mk"} {
+			_, err := os.Stat(filepath.Join(dir, buildFile))
+			if err == nil {
+				// Returning the filename Android.mk as it might be used for ONE_SHOT_MAKEFILE variable.
+				return filepath.Join(dir, "Android.mk")
+			}
+			if !os.IsNotExist(err) {
+				ctx.Fatalf("Error retrieving the build file stats: %v", err)
+			}
+		}
+	}
+
+	return ""
+}
+
+// splitArgs iterates over the arguments list and splits into two lists: arguments and directories.
+func splitArgs(args []string) (newArgs []string, dirs []string) {
+	specialArgs := map[string]bool{
+		"showcommands": true,
+		"snod":         true,
+		"dist":         true,
+		"checkbuild":   true,
+	}
+
+	newArgs = []string{}
+	dirs = []string{}
+
+	for _, arg := range args {
+		// It's a dash argument if it starts with "-" or it's a key=value pair, it's not a directory.
+		if strings.IndexRune(arg, '-') == 0 || strings.IndexRune(arg, '=') != -1 {
+			newArgs = append(newArgs, arg)
+			continue
+		}
+
+		if _, ok := specialArgs[arg]; ok {
+			newArgs = append(newArgs, arg)
+			continue
+		}
+
+		dirs = append(dirs, arg)
+	}
+
+	return newArgs, dirs
+}
+
+// getTargetsFromDirs iterates over the dirs list and creates a list of targets to build. If a
+// directory from the dirs list does not exist, a fatal error is raised. relDir is related to the
+// source root tree where the build action command was invoked. Each directory is validated if the
+// build file can be found and follows the format "dir1:target1,target2,...". Target is optional.
+func getTargetsFromDirs(ctx Context, relDir string, dirs []string, targetNamePrefix string) (targets []string, buildFiles []string) {
+	for _, dir := range dirs {
+		// The directory may have specified specific modules to build. ":" is the separator to separate
+		// the directory and the list of modules.
+		s := strings.Split(dir, ":")
+		l := len(s)
+		if l > 2 { // more than one ":" was specified.
+			ctx.Fatalf("%s not in proper directory:target1,target2,... format (\":\" was specified more than once)", dir)
+		}
+
+		dir = filepath.Join(relDir, s[0])
+		if _, err := os.Stat(dir); err != nil {
+			ctx.Fatalf("couldn't find directory %s", dir)
+		}
+
+		// Verify that if there are any targets specified after ":". Each target is separated by ",".
+		var newTargets []string
+		if l == 2 && s[1] != "" {
+			newTargets = strings.Split(s[1], ",")
+			if inList("", newTargets) {
+				ctx.Fatalf("%s not in proper directory:target1,target2,... format", dir)
+			}
+		}
+
+		buildFile := findBuildFile(ctx, dir)
+		if buildFile == "" {
+			ctx.Fatalf("Build file not found for %s directory", dir)
+		}
+		buildFileDir := filepath.Dir(buildFile)
+
+		// If there are specified targets, find the build file in the directory. If dir does not
+		// contain the build file, bail out as it is required for one shot build. If there are no
+		// target specified, build all the modules in dir (or the closest one in the dir path).
+		if len(newTargets) > 0 {
+			if buildFileDir != dir {
+				ctx.Fatalf("Couldn't locate a build file from %s directory", dir)
+			}
+		} else {
+			newTargets = []string{convertToTarget(buildFileDir, targetNamePrefix)}
+		}
+
+		buildFiles = append(buildFiles, buildFile)
+		targets = append(targets, newTargets...)
+	}
+
+	return targets, buildFiles
+}
+
 func (c *configImpl) parseArgs(ctx Context, args []string) {
 	for i := 0; i < len(args); i++ {
 		arg := strings.TrimSpace(args[i])
diff --git a/ui/build/config_test.go b/ui/build/config_test.go
index 242e3af..856af11 100644
--- a/ui/build/config_test.go
+++ b/ui/build/config_test.go
@@ -17,19 +17,22 @@
 import (
 	"bytes"
 	"context"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
 	"reflect"
 	"strings"
 	"testing"
 
 	"android/soong/ui/logger"
-	"android/soong/ui/terminal"
 )
 
 func testContext() Context {
 	return Context{&ContextImpl{
 		Context: context.Background(),
 		Logger:  logger.New(&bytes.Buffer{}),
-		Writer:  terminal.NewWriter(terminal.NewCustomStdio(&bytes.Buffer{}, &bytes.Buffer{}, &bytes.Buffer{})),
+		Writer:  &bytes.Buffer{},
 	}}
 }
 
@@ -173,3 +176,922 @@
 		})
 	}
 }
+
+func TestConfigCheckTopDir(t *testing.T) {
+	ctx := testContext()
+	buildRootDir := filepath.Dir(srcDirFileCheck)
+	expectedErrStr := fmt.Sprintf("Current working directory must be the source tree. %q not found.", srcDirFileCheck)
+
+	tests := []struct {
+		// ********* Setup *********
+		// Test description.
+		description string
+
+		// ********* Action *********
+		// If set to true, the build root file is created.
+		rootBuildFile bool
+
+		// The current path where Soong is being executed.
+		path string
+
+		// ********* Validation *********
+		// Expecting error and validate the error string against expectedErrStr.
+		wantErr bool
+	}{{
+		description:   "current directory is the root source tree",
+		rootBuildFile: true,
+		path:          ".",
+		wantErr:       false,
+	}, {
+		description:   "one level deep in the source tree",
+		rootBuildFile: true,
+		path:          "1",
+		wantErr:       true,
+	}, {
+		description:   "very deep in the source tree",
+		rootBuildFile: true,
+		path:          "1/2/3/4/5/6/7/8/9/1/2/3/4/5/6/7/8/9/1/2/3/4/5/6/7/8/9/1/2/3/4/5/6/7",
+		wantErr:       true,
+	}, {
+		description:   "outside of source tree",
+		rootBuildFile: false,
+		path:          "1/2/3/4/5",
+		wantErr:       true,
+	}}
+
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			defer logger.Recover(func(err error) {
+				if !tt.wantErr {
+					t.Fatalf("Got unexpected error: %v", err)
+				}
+				if expectedErrStr != err.Error() {
+					t.Fatalf("expected %s, got %s", expectedErrStr, err.Error())
+				}
+			})
+
+			// Create the root source tree.
+			rootDir, err := ioutil.TempDir("", "")
+			if err != nil {
+				t.Fatal(err)
+			}
+			defer os.RemoveAll(rootDir)
+
+			// Create the build root file. This is to test if topDir returns an error if the build root
+			// file does not exist.
+			if tt.rootBuildFile {
+				dir := filepath.Join(rootDir, buildRootDir)
+				if err := os.MkdirAll(dir, 0755); err != nil {
+					t.Errorf("failed to create %s directory: %v", dir, err)
+				}
+				f := filepath.Join(rootDir, srcDirFileCheck)
+				if err := ioutil.WriteFile(f, []byte{}, 0644); err != nil {
+					t.Errorf("failed to create file %s: %v", f, err)
+				}
+			}
+
+			// Next block of code is to set the current directory.
+			dir := rootDir
+			if tt.path != "" {
+				dir = filepath.Join(dir, tt.path)
+				if err := os.MkdirAll(dir, 0755); err != nil {
+					t.Errorf("failed to create %s directory: %v", dir, err)
+				}
+			}
+			curDir, err := os.Getwd()
+			if err != nil {
+				t.Fatalf("failed to get the current directory: %v", err)
+			}
+			defer func() { os.Chdir(curDir) }()
+
+			if err := os.Chdir(dir); err != nil {
+				t.Fatalf("failed to change directory to %s: %v", dir, err)
+			}
+
+			checkTopDir(ctx)
+		})
+	}
+}
+
+func TestConfigConvertToTarget(t *testing.T) {
+	tests := []struct {
+		// ********* Setup *********
+		// Test description.
+		description string
+
+		// ********* Action *********
+		// The current directory where Soong is being executed.
+		dir string
+
+		// The current prefix string to be pre-appended to the target.
+		prefix string
+
+		// ********* Validation *********
+		// The expected target to be invoked in ninja.
+		expectedTarget string
+	}{{
+		description:    "one level directory in source tree",
+		dir:            "test1",
+		prefix:         "MODULES-IN-",
+		expectedTarget: "MODULES-IN-test1",
+	}, {
+		description:    "multiple level directories in source tree",
+		dir:            "test1/test2/test3/test4",
+		prefix:         "GET-INSTALL-PATH-IN-",
+		expectedTarget: "GET-INSTALL-PATH-IN-test1-test2-test3-test4",
+	}}
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			target := convertToTarget(tt.dir, tt.prefix)
+			if target != tt.expectedTarget {
+				t.Errorf("expected %s, got %s for target", tt.expectedTarget, target)
+			}
+		})
+	}
+}
+
+func setTop(t *testing.T, dir string) func() {
+	curDir, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("failed to get current directory: %v", err)
+	}
+	if err := os.Chdir(dir); err != nil {
+		t.Fatalf("failed to change directory to top dir %s: %v", dir, err)
+	}
+	return func() { os.Chdir(curDir) }
+}
+
+func createBuildFiles(t *testing.T, topDir string, buildFiles []string) {
+	for _, buildFile := range buildFiles {
+		buildFile = filepath.Join(topDir, buildFile)
+		if err := ioutil.WriteFile(buildFile, []byte{}, 0644); err != nil {
+			t.Errorf("failed to create file %s: %v", buildFile, err)
+		}
+	}
+}
+
+func createDirectories(t *testing.T, topDir string, dirs []string) {
+	for _, dir := range dirs {
+		dir = filepath.Join(topDir, dir)
+		if err := os.MkdirAll(dir, 0755); err != nil {
+			t.Errorf("failed to create %s directory: %v", dir, err)
+		}
+	}
+}
+
+func TestConfigGetTargets(t *testing.T) {
+	ctx := testContext()
+	tests := []struct {
+		// ********* Setup *********
+		// Test description.
+		description string
+
+		// Directories that exist in the source tree.
+		dirsInTrees []string
+
+		// Build files that exists in the source tree.
+		buildFiles []string
+
+		// ********* Action *********
+		// Directories passed in to soong_ui.
+		dirs []string
+
+		// Current directory that the user executed the build action command.
+		curDir string
+
+		// ********* Validation *********
+		// Expected targets from the function.
+		expectedTargets []string
+
+		// Expected build from the build system.
+		expectedBuildFiles []string
+
+		// Expecting error from running test case.
+		errStr string
+	}{{
+		description:        "one target dir specified",
+		dirsInTrees:        []string{"0/1/2/3"},
+		buildFiles:         []string{"0/1/2/3/Android.bp"},
+		dirs:               []string{"1/2/3"},
+		curDir:             "0",
+		expectedTargets:    []string{"MODULES-IN-0-1-2-3"},
+		expectedBuildFiles: []string{"0/1/2/3/Android.mk"},
+	}, {
+		description: "one target dir specified, build file does not exist",
+		dirsInTrees: []string{"0/1/2/3"},
+		buildFiles:  []string{},
+		dirs:        []string{"1/2/3"},
+		curDir:      "0",
+		errStr:      "Build file not found for 0/1/2/3 directory",
+	}, {
+		description: "one target dir specified, invalid targets specified",
+		dirsInTrees: []string{"0/1/2/3"},
+		buildFiles:  []string{},
+		dirs:        []string{"1/2/3:t1:t2"},
+		curDir:      "0",
+		errStr:      "1/2/3:t1:t2 not in proper directory:target1,target2,... format (\":\" was specified more than once)",
+	}, {
+		description:        "one target dir specified, no targets specified but has colon",
+		dirsInTrees:        []string{"0/1/2/3"},
+		buildFiles:         []string{"0/1/2/3/Android.bp"},
+		dirs:               []string{"1/2/3:"},
+		curDir:             "0",
+		expectedTargets:    []string{"MODULES-IN-0-1-2-3"},
+		expectedBuildFiles: []string{"0/1/2/3/Android.mk"},
+	}, {
+		description:        "one target dir specified, two targets specified",
+		dirsInTrees:        []string{"0/1/2/3"},
+		buildFiles:         []string{"0/1/2/3/Android.bp"},
+		dirs:               []string{"1/2/3:t1,t2"},
+		curDir:             "0",
+		expectedTargets:    []string{"t1", "t2"},
+		expectedBuildFiles: []string{"0/1/2/3/Android.mk"},
+	}, {
+		description: "one target dir specified, no targets and has a comma",
+		dirsInTrees: []string{"0/1/2/3"},
+		buildFiles:  []string{"0/1/2/3/Android.bp"},
+		dirs:        []string{"1/2/3:,"},
+		curDir:      "0",
+		errStr:      "0/1/2/3 not in proper directory:target1,target2,... format",
+	}, {
+		description: "one target dir specified, improper targets defined",
+		dirsInTrees: []string{"0/1/2/3"},
+		buildFiles:  []string{"0/1/2/3/Android.bp"},
+		dirs:        []string{"1/2/3:,t1"},
+		curDir:      "0",
+		errStr:      "0/1/2/3 not in proper directory:target1,target2,... format",
+	}, {
+		description: "one target dir specified, blank target",
+		dirsInTrees: []string{"0/1/2/3"},
+		buildFiles:  []string{"0/1/2/3/Android.bp"},
+		dirs:        []string{"1/2/3:t1,"},
+		curDir:      "0",
+		errStr:      "0/1/2/3 not in proper directory:target1,target2,... format",
+	}, {
+		description:        "one target dir specified, many targets specified",
+		dirsInTrees:        []string{"0/1/2/3"},
+		buildFiles:         []string{"0/1/2/3/Android.bp"},
+		dirs:               []string{"1/2/3:t1,t2,t3,t4,t5,t6,t7,t8,t9,t10"},
+		curDir:             "0",
+		expectedTargets:    []string{"t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9", "t10"},
+		expectedBuildFiles: []string{"0/1/2/3/Android.mk"},
+	}, {
+		description: "one target dir specified, one target specified, build file does not exist",
+		dirsInTrees: []string{"0/1/2/3"},
+		buildFiles:  []string{},
+		dirs:        []string{"1/2/3:t1"},
+		curDir:      "0",
+		errStr:      "Build file not found for 0/1/2/3 directory",
+	}, {
+		description: "one target dir specified, one target specified, build file not in target dir",
+		dirsInTrees: []string{"0/1/2/3"},
+		buildFiles:  []string{"0/1/2/Android.mk"},
+		dirs:        []string{"1/2/3:t1"},
+		curDir:      "0",
+		errStr:      "Couldn't locate a build file from 0/1/2/3 directory",
+	}, {
+		description:        "one target dir specified, build file not in target dir",
+		dirsInTrees:        []string{"0/1/2/3"},
+		buildFiles:         []string{"0/1/2/Android.mk"},
+		dirs:               []string{"1/2/3"},
+		curDir:             "0",
+		expectedTargets:    []string{"MODULES-IN-0-1-2"},
+		expectedBuildFiles: []string{"0/1/2/Android.mk"},
+	}, {
+		description:        "multiple targets dir specified, targets specified",
+		dirsInTrees:        []string{"0/1/2/3", "0/3/4"},
+		buildFiles:         []string{"0/1/2/3/Android.bp", "0/3/4/Android.mk"},
+		dirs:               []string{"1/2/3:t1,t2", "3/4:t3,t4,t5"},
+		curDir:             "0",
+		expectedTargets:    []string{"t1", "t2", "t3", "t4", "t5"},
+		expectedBuildFiles: []string{"0/1/2/3/Android.mk", "0/3/4/Android.mk"},
+	}, {
+		description:        "multiple targets dir specified, one directory has targets specified",
+		dirsInTrees:        []string{"0/1/2/3", "0/3/4"},
+		buildFiles:         []string{"0/1/2/3/Android.bp", "0/3/4/Android.mk"},
+		dirs:               []string{"1/2/3:t1,t2", "3/4"},
+		curDir:             "0",
+		expectedTargets:    []string{"t1", "t2", "MODULES-IN-0-3-4"},
+		expectedBuildFiles: []string{"0/1/2/3/Android.mk", "0/3/4/Android.mk"},
+	}, {
+		description: "two dirs specified, only one dir exist",
+		dirsInTrees: []string{"0/1/2/3"},
+		buildFiles:  []string{"0/1/2/3/Android.mk"},
+		dirs:        []string{"1/2/3:t1", "3/4"},
+		curDir:      "0",
+		errStr:      "couldn't find directory 0/3/4",
+	}, {
+		description:        "multiple targets dirs specified at root source tree",
+		dirsInTrees:        []string{"0/1/2/3", "0/3/4"},
+		buildFiles:         []string{"0/1/2/3/Android.bp", "0/3/4/Android.mk"},
+		dirs:               []string{"0/1/2/3:t1,t2", "0/3/4"},
+		curDir:             ".",
+		expectedTargets:    []string{"t1", "t2", "MODULES-IN-0-3-4"},
+		expectedBuildFiles: []string{"0/1/2/3/Android.mk", "0/3/4/Android.mk"},
+	}, {
+		description: "no directories specified",
+		dirsInTrees: []string{"0/1/2/3", "0/3/4"},
+		buildFiles:  []string{"0/1/2/3/Android.bp", "0/3/4/Android.mk"},
+		dirs:        []string{},
+		curDir:      ".",
+	}}
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			defer logger.Recover(func(err error) {
+				if tt.errStr == "" {
+					t.Fatalf("Got unexpected error: %v", err)
+				}
+				if tt.errStr != err.Error() {
+					t.Errorf("expected %s, got %s", tt.errStr, err.Error())
+				}
+			})
+
+			// Create the root source tree.
+			topDir, err := ioutil.TempDir("", "")
+			if err != nil {
+				t.Fatalf("failed to create temp dir: %v", err)
+			}
+			defer os.RemoveAll(topDir)
+
+			createDirectories(t, topDir, tt.dirsInTrees)
+			createBuildFiles(t, topDir, tt.buildFiles)
+			r := setTop(t, topDir)
+			defer r()
+
+			targets, buildFiles := getTargetsFromDirs(ctx, tt.curDir, tt.dirs, "MODULES-IN-")
+			if !reflect.DeepEqual(targets, tt.expectedTargets) {
+				t.Errorf("expected %v, got %v for targets", tt.expectedTargets, targets)
+			}
+			if !reflect.DeepEqual(buildFiles, tt.expectedBuildFiles) {
+				t.Errorf("expected %v, got %v for build files", tt.expectedBuildFiles, buildFiles)
+			}
+
+			// If the execution reached here and there was an expected error code, the unit test case failed.
+			if tt.errStr != "" {
+				t.Errorf("expecting error %s", tt.errStr)
+			}
+		})
+	}
+}
+
+func TestConfigFindBuildFile(t *testing.T) {
+	ctx := testContext()
+
+	tests := []struct {
+		// ********* Setup *********
+		// Test description.
+		description string
+
+		// Array of build files to create in dir.
+		buildFiles []string
+
+		// ********* Action *********
+		// Directory to create, also the base directory is where findBuildFile is invoked.
+		dir string
+
+		// ********* Validation *********
+		// Expected build file path to find.
+		expectedBuildFile string
+	}{{
+		description:       "build file exists at leaf directory",
+		buildFiles:        []string{"1/2/3/Android.bp"},
+		dir:               "1/2/3",
+		expectedBuildFile: "1/2/3/Android.mk",
+	}, {
+		description:       "build file exists in all directory paths",
+		buildFiles:        []string{"1/Android.mk", "1/2/Android.mk", "1/2/3/Android.mk"},
+		dir:               "1/2/3",
+		expectedBuildFile: "1/2/3/Android.mk",
+	}, {
+		description:       "build file does not exist in all directory paths",
+		buildFiles:        []string{},
+		dir:               "1/2/3",
+		expectedBuildFile: "",
+	}, {
+		description:       "build file exists only at top directory",
+		buildFiles:        []string{"Android.bp"},
+		dir:               "1/2/3",
+		expectedBuildFile: "",
+	}, {
+		description:       "build file exist in a subdirectory",
+		buildFiles:        []string{"1/2/Android.bp"},
+		dir:               "1/2/3",
+		expectedBuildFile: "1/2/Android.mk",
+	}, {
+		description:       "build file exists in a subdirectory",
+		buildFiles:        []string{"1/Android.mk"},
+		dir:               "1/2/3",
+		expectedBuildFile: "1/Android.mk",
+	}, {
+		description:       "top directory",
+		buildFiles:        []string{"Android.bp"},
+		dir:               ".",
+		expectedBuildFile: "",
+	}}
+
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			defer logger.Recover(func(err error) {
+				t.Fatalf("Got unexpected error: %v", err)
+			})
+
+			topDir, err := ioutil.TempDir("", "")
+			if err != nil {
+				t.Fatalf("failed to create temp dir: %v", err)
+			}
+			defer os.RemoveAll(topDir)
+
+			if tt.dir != "" {
+				createDirectories(t, topDir, []string{tt.dir})
+			}
+
+			createBuildFiles(t, topDir, tt.buildFiles)
+
+			curDir, err := os.Getwd()
+			if err != nil {
+				t.Fatalf("Could not get working directory: %v", err)
+			}
+			defer func() { os.Chdir(curDir) }()
+			if err := os.Chdir(topDir); err != nil {
+				t.Fatalf("Could not change top dir to %s: %v", topDir, err)
+			}
+
+			buildFile := findBuildFile(ctx, tt.dir)
+			if buildFile != tt.expectedBuildFile {
+				t.Errorf("expected %q, got %q for build file", tt.expectedBuildFile, buildFile)
+			}
+		})
+	}
+}
+
+func TestConfigSplitArgs(t *testing.T) {
+	tests := []struct {
+		// ********* Setup *********
+		// Test description.
+		description string
+
+		// ********* Action *********
+		// Arguments passed in to soong_ui.
+		args []string
+
+		// ********* Validation *********
+		// Expected newArgs list after extracting the directories.
+		expectedNewArgs []string
+
+		// Expected directories
+		expectedDirs []string
+	}{{
+		description:     "flags but no directories specified",
+		args:            []string{"showcommands", "-j", "-k"},
+		expectedNewArgs: []string{"showcommands", "-j", "-k"},
+		expectedDirs:    []string{},
+	}, {
+		description:     "flags and one directory specified",
+		args:            []string{"snod", "-j", "dir:target1,target2"},
+		expectedNewArgs: []string{"snod", "-j"},
+		expectedDirs:    []string{"dir:target1,target2"},
+	}, {
+		description:     "flags and directories specified",
+		args:            []string{"dist", "-k", "dir1", "dir2:target1,target2"},
+		expectedNewArgs: []string{"dist", "-k"},
+		expectedDirs:    []string{"dir1", "dir2:target1,target2"},
+	}, {
+		description:     "only directories specified",
+		args:            []string{"dir1", "dir2", "dir3:target1,target2"},
+		expectedNewArgs: []string{},
+		expectedDirs:    []string{"dir1", "dir2", "dir3:target1,target2"},
+	}}
+	for _, tt := range tests {
+		t.Run(tt.description, func(t *testing.T) {
+			args, dirs := splitArgs(tt.args)
+			if !reflect.DeepEqual(tt.expectedNewArgs, args) {
+				t.Errorf("expected %v, got %v for arguments", tt.expectedNewArgs, args)
+			}
+			if !reflect.DeepEqual(tt.expectedDirs, dirs) {
+				t.Errorf("expected %v, got %v for directories", tt.expectedDirs, dirs)
+			}
+		})
+	}
+}
+
+type envVar struct {
+	name  string
+	value string
+}
+
+type buildActionTestCase struct {
+	// ********* Setup *********
+	// Test description.
+	description string
+
+	// Directories that exist in the source tree.
+	dirsInTrees []string
+
+	// Build files that exists in the source tree.
+	buildFiles []string
+
+	// ********* Action *********
+	// Arguments passed in to soong_ui.
+	args []string
+
+	// Directory where the build action was invoked.
+	curDir string
+
+	// WITH_TIDY_ONLY environment variable specified.
+	tidyOnly string
+
+	// ********* Validation *********
+	// Expected arguments to be in Config instance.
+	expectedArgs []string
+
+	// Expected environment variables to be set.
+	expectedEnvVars []envVar
+}
+
+func testGetConfigArgs(t *testing.T, tt buildActionTestCase, action BuildAction, buildDependencies bool) {
+	ctx := testContext()
+
+	// Environment variables to set it to blank on every test case run.
+	resetEnvVars := []string{
+		"ONE_SHOT_MAKEFILE",
+		"WITH_TIDY_ONLY",
+	}
+
+	for _, name := range resetEnvVars {
+		if err := os.Unsetenv(name); err != nil {
+			t.Fatalf("failed to unset environment variable %s: %v", name, err)
+		}
+	}
+	if tt.tidyOnly != "" {
+		if err := os.Setenv("WITH_TIDY_ONLY", tt.tidyOnly); err != nil {
+			t.Errorf("failed to set WITH_TIDY_ONLY to %s: %v", tt.tidyOnly, err)
+		}
+	}
+
+	// Create the root source tree.
+	topDir, err := ioutil.TempDir("", "")
+	if err != nil {
+		t.Fatalf("failed to create temp dir: %v", err)
+	}
+	defer os.RemoveAll(topDir)
+
+	createDirectories(t, topDir, tt.dirsInTrees)
+	createBuildFiles(t, topDir, tt.buildFiles)
+
+	r := setTop(t, topDir)
+	defer r()
+
+	// The next block is to create the root build file.
+	rootBuildFileDir := filepath.Dir(srcDirFileCheck)
+	if err := os.MkdirAll(rootBuildFileDir, 0755); err != nil {
+		t.Fatalf("Failed to create %s directory: %v", rootBuildFileDir, err)
+	}
+
+	if err := ioutil.WriteFile(srcDirFileCheck, []byte{}, 0644); err != nil {
+		t.Fatalf("failed to create %s file: %v", srcDirFileCheck, err)
+	}
+
+	args := getConfigArgs(action, tt.curDir, buildDependencies, ctx, tt.args)
+	if !reflect.DeepEqual(tt.expectedArgs, args) {
+		t.Fatalf("expected %v, got %v for config arguments", tt.expectedArgs, args)
+	}
+
+	for _, env := range tt.expectedEnvVars {
+		if val := os.Getenv(env.name); val != env.value {
+			t.Errorf("expecting %s, got %s for environment variable %s", env.value, val, env.name)
+		}
+	}
+}
+
+func TestGetConfigArgsBuildModules(t *testing.T) {
+	tests := []buildActionTestCase{{
+		description:     "normal execution from the root source tree directory",
+		dirsInTrees:     []string{"0/1/2", "0/2", "0/3"},
+		buildFiles:      []string{"0/1/2/Android.mk", "0/2/Android.bp", "0/3/Android.mk"},
+		args:            []string{"-j", "fake_module", "fake_module2"},
+		curDir:          ".",
+		tidyOnly:        "",
+		expectedArgs:    []string{"-j", "fake_module", "fake_module2"},
+		expectedEnvVars: []envVar{},
+	}, {
+		description:     "normal execution in deep directory",
+		dirsInTrees:     []string{"0/1/2", "0/2", "0/3", "1/2/3/4/5/6/7/8/9/1/2/3/4/5/6"},
+		buildFiles:      []string{"0/1/2/Android.mk", "0/2/Android.bp", "1/2/3/4/5/6/7/8/9/1/2/3/4/5/6/Android.mk"},
+		args:            []string{"-j", "fake_module", "fake_module2", "-k"},
+		curDir:          "1/2/3/4/5/6/7/8/9",
+		tidyOnly:        "",
+		expectedArgs:    []string{"-j", "fake_module", "fake_module2", "-k"},
+		expectedEnvVars: []envVar{},
+	}, {
+		description:     "normal execution in deep directory, no targets",
+		dirsInTrees:     []string{"0/1/2", "0/2", "0/3", "1/2/3/4/5/6/7/8/9/1/2/3/4/5/6"},
+		buildFiles:      []string{"0/1/2/Android.mk", "0/2/Android.bp", "1/2/3/4/5/6/7/8/9/1/2/3/4/5/6/Android.mk"},
+		args:            []string{"-j", "-k"},
+		curDir:          "1/2/3/4/5/6/7/8/9",
+		tidyOnly:        "",
+		expectedArgs:    []string{"-j", "-k"},
+		expectedEnvVars: []envVar{},
+	}, {
+		description:     "normal execution in root source tree, no args",
+		dirsInTrees:     []string{"0/1/2", "0/2", "0/3"},
+		buildFiles:      []string{"0/1/2/Android.mk", "0/2/Android.bp"},
+		args:            []string{},
+		curDir:          "1/2/3/4/5/6/7/8/9",
+		tidyOnly:        "",
+		expectedArgs:    []string{},
+		expectedEnvVars: []envVar{},
+	}}
+	for _, tt := range tests {
+		t.Run("build action BUILD_MODULES with dependencies, "+tt.description, func(t *testing.T) {
+			testGetConfigArgs(t, tt, BUILD_MODULES, true)
+		})
+	}
+}
+
+// TODO: Remove this test case once mm shell build command has been deprecated.
+func TestGetConfigArgsBuildModulesInDirecotoryNoDeps(t *testing.T) {
+	tests := []buildActionTestCase{{
+		description:  "normal execution in a directory",
+		dirsInTrees:  []string{"0/1/2"},
+		buildFiles:   []string{"0/1/2/Android.mk"},
+		args:         []string{"-j", "-k", "showcommands", "fake-module"},
+		curDir:       "0/1/2",
+		tidyOnly:     "",
+		expectedArgs: []string{"-j", "-k", "showcommands", "fake-module", "MODULES-IN-0-1-2"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/2/Android.mk"}},
+	}, {
+		description:  "makefile in parent directory",
+		dirsInTrees:  []string{"0/1/2"},
+		buildFiles:   []string{"0/1/Android.mk"},
+		args:         []string{},
+		curDir:       "0/1/2",
+		tidyOnly:     "",
+		expectedArgs: []string{"MODULES-IN-0-1"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/Android.mk"}},
+	}, {
+		description:  "build file not found",
+		dirsInTrees:  []string{"0/1/2"},
+		buildFiles:   []string{},
+		args:         []string{},
+		curDir:       "0/1/2",
+		tidyOnly:     "",
+		expectedArgs: []string{"MODULES-IN-0-1-2"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/2/Android.mk"}},
+	}, {
+		description:  "build action executed at root directory",
+		dirsInTrees:  []string{},
+		buildFiles:   []string{},
+		args:         []string{},
+		curDir:       ".",
+		tidyOnly:     "",
+		expectedArgs: []string{},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: ""}},
+	}, {
+		description:  "GET-INSTALL-PATH specified,",
+		dirsInTrees:  []string{"0/1/2"},
+		buildFiles:   []string{"0/1/Android.mk"},
+		args:         []string{"GET-INSTALL-PATH"},
+		curDir:       "0/1/2",
+		tidyOnly:     "",
+		expectedArgs: []string{"GET-INSTALL-PATH-IN-0-1"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/Android.mk"}},
+	}, {
+		description:  "tidy only environment variable specified,",
+		dirsInTrees:  []string{"0/1/2"},
+		buildFiles:   []string{"0/1/Android.mk"},
+		args:         []string{"GET-INSTALL-PATH"},
+		curDir:       "0/1/2",
+		tidyOnly:     "true",
+		expectedArgs: []string{"tidy_only"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/Android.mk"}},
+	}}
+	for _, tt := range tests {
+		t.Run("build action BUILD_MODULES_IN_DIR without their dependencies, "+tt.description, func(t *testing.T) {
+			testGetConfigArgs(t, tt, BUILD_MODULES_IN_A_DIRECTORY, false)
+		})
+	}
+}
+
+func TestGetConfigArgsBuildModulesInDirectory(t *testing.T) {
+	tests := []buildActionTestCase{{
+		description:     "normal execution in a directory",
+		dirsInTrees:     []string{"0/1/2"},
+		buildFiles:      []string{"0/1/2/Android.mk"},
+		args:            []string{"fake-module"},
+		curDir:          "0/1/2",
+		tidyOnly:        "",
+		expectedArgs:    []string{"fake-module", "MODULES-IN-0-1-2"},
+		expectedEnvVars: []envVar{},
+	}, {
+		description:     "build file in parent directory",
+		dirsInTrees:     []string{"0/1/2"},
+		buildFiles:      []string{"0/1/Android.mk"},
+		args:            []string{},
+		curDir:          "0/1/2",
+		tidyOnly:        "",
+		expectedArgs:    []string{"MODULES-IN-0-1"},
+		expectedEnvVars: []envVar{},
+	},
+		{
+			description:     "build file in parent directory, multiple module names passed in",
+			dirsInTrees:     []string{"0/1/2"},
+			buildFiles:      []string{"0/1/Android.mk"},
+			args:            []string{"fake-module1", "fake-module2", "fake-module3"},
+			curDir:          "0/1/2",
+			tidyOnly:        "",
+			expectedArgs:    []string{"fake-module1", "fake-module2", "fake-module3", "MODULES-IN-0-1"},
+			expectedEnvVars: []envVar{},
+		}, {
+			description:     "build file in 2nd level parent directory",
+			dirsInTrees:     []string{"0/1/2"},
+			buildFiles:      []string{"0/Android.bp"},
+			args:            []string{},
+			curDir:          "0/1/2",
+			tidyOnly:        "",
+			expectedArgs:    []string{"MODULES-IN-0"},
+			expectedEnvVars: []envVar{},
+		}, {
+			description:     "build action executed at root directory",
+			dirsInTrees:     []string{},
+			buildFiles:      []string{},
+			args:            []string{},
+			curDir:          ".",
+			tidyOnly:        "",
+			expectedArgs:    []string{},
+			expectedEnvVars: []envVar{},
+		}, {
+			description:     "build file not found - no error is expected to return",
+			dirsInTrees:     []string{"0/1/2"},
+			buildFiles:      []string{},
+			args:            []string{},
+			curDir:          "0/1/2",
+			tidyOnly:        "",
+			expectedArgs:    []string{"MODULES-IN-0-1-2"},
+			expectedEnvVars: []envVar{},
+		}, {
+			description:     "GET-INSTALL-PATH specified,",
+			dirsInTrees:     []string{"0/1/2"},
+			buildFiles:      []string{"0/1/Android.mk"},
+			args:            []string{"GET-INSTALL-PATH", "-j", "-k", "GET-INSTALL-PATH"},
+			curDir:          "0/1/2",
+			tidyOnly:        "",
+			expectedArgs:    []string{"-j", "-k", "GET-INSTALL-PATH-IN-0-1"},
+			expectedEnvVars: []envVar{},
+		}, {
+			description:     "tidy only environment variable specified,",
+			dirsInTrees:     []string{"0/1/2"},
+			buildFiles:      []string{"0/1/Android.mk"},
+			args:            []string{"GET-INSTALL-PATH"},
+			curDir:          "0/1/2",
+			tidyOnly:        "true",
+			expectedArgs:    []string{"tidy_only"},
+			expectedEnvVars: []envVar{},
+		}, {
+			description:     "normal execution in root directory with args",
+			dirsInTrees:     []string{},
+			buildFiles:      []string{},
+			args:            []string{"-j", "-k", "fake_module"},
+			curDir:          "",
+			tidyOnly:        "",
+			expectedArgs:    []string{"-j", "-k", "fake_module"},
+			expectedEnvVars: []envVar{},
+		}}
+	for _, tt := range tests {
+		t.Run("build action BUILD_MODULES_IN_DIR, "+tt.description, func(t *testing.T) {
+			testGetConfigArgs(t, tt, BUILD_MODULES_IN_A_DIRECTORY, true)
+		})
+	}
+}
+
+// TODO: Remove this test case once mmm shell build command has been deprecated.
+func TestGetConfigArgsBuildModulesInDirectoriesNoDeps(t *testing.T) {
+	tests := []buildActionTestCase{{
+		description:  "normal execution in a directory",
+		dirsInTrees:  []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/2/3.3"},
+		buildFiles:   []string{"0/1/2/3.1/Android.bp", "0/1/2/3.2/Android.bp", "0/1/2/3.3/Android.bp"},
+		args:         []string{"3.1/:t1,t2", "3.2/:t3,t4", "3.3/:t5,t6"},
+		curDir:       "0/1/2",
+		tidyOnly:     "",
+		expectedArgs: []string{"t1", "t2", "t3", "t4", "t5", "t6"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/2/3.1/Android.mk 0/1/2/3.2/Android.mk 0/1/2/3.3/Android.mk"}},
+	}, {
+		description:  "GET-INSTALL-PATH specified",
+		dirsInTrees:  []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/2/3.3"},
+		buildFiles:   []string{"0/1/2/3.1/Android.bp", "0/1/2/3.2/Android.bp", "0/1/2/3.3/Android.bp"},
+		args:         []string{"GET-INSTALL-PATH", "3.1/", "3.2/", "3.3/:t6"},
+		curDir:       "0/1/2",
+		tidyOnly:     "",
+		expectedArgs: []string{"GET-INSTALL-PATH-IN-0-1-2-3.1", "GET-INSTALL-PATH-IN-0-1-2-3.2", "t6"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/2/3.1/Android.mk 0/1/2/3.2/Android.mk 0/1/2/3.3/Android.mk"}},
+	}, {
+		description:  "tidy only environment variable specified",
+		dirsInTrees:  []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/2/3.3"},
+		buildFiles:   []string{"0/1/2/3.1/Android.bp", "0/1/2/3.2/Android.bp", "0/1/2/3.3/Android.bp"},
+		args:         []string{"GET-INSTALL-PATH", "3.1/", "3.2/", "3.3/:t6"},
+		curDir:       "0/1/2",
+		tidyOnly:     "1",
+		expectedArgs: []string{"tidy_only"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/2/3.1/Android.mk 0/1/2/3.2/Android.mk 0/1/2/3.3/Android.mk"}},
+	}, {
+		description:  "normal execution from top dir directory",
+		dirsInTrees:  []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/2/3.3"},
+		buildFiles:   []string{"0/1/2/3.1/Android.bp", "0/1/2/3.2/Android.bp", "0/1/2/3.3/Android.bp"},
+		args:         []string{"0/1/2/3.1", "0/1/2/3.2/:t3,t4", "0/1/2/3.3/:t5,t6"},
+		curDir:       ".",
+		tidyOnly:     "",
+		expectedArgs: []string{"MODULES-IN-0-1-2-3.1", "t3", "t4", "t5", "t6"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: "0/1/2/3.1/Android.mk 0/1/2/3.2/Android.mk 0/1/2/3.3/Android.mk"}},
+	}}
+	for _, tt := range tests {
+		t.Run("build action BUILD_MODULES_IN_DIRS_NO_DEPS, "+tt.description, func(t *testing.T) {
+			testGetConfigArgs(t, tt, BUILD_MODULES_IN_DIRECTORIES, false)
+		})
+	}
+}
+
+func TestGetConfigArgsBuildModulesInDirectories(t *testing.T) {
+	tests := []buildActionTestCase{{
+		description:  "normal execution in a directory",
+		dirsInTrees:  []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/2/3.3"},
+		buildFiles:   []string{"0/1/2/3.1/Android.bp", "0/1/2/3.2/Android.bp", "0/1/2/3.3/Android.bp"},
+		args:         []string{"3.1/", "3.2/", "3.3/"},
+		curDir:       "0/1/2",
+		tidyOnly:     "",
+		expectedArgs: []string{"MODULES-IN-0-1-2-3.1", "MODULES-IN-0-1-2-3.2", "MODULES-IN-0-1-2-3.3"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: ""}},
+	}, {
+		description:  "GET-INSTALL-PATH specified",
+		dirsInTrees:  []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/3"},
+		buildFiles:   []string{"0/1/2/3.1/Android.bp", "0/1/2/3.2/Android.bp", "0/1/Android.bp"},
+		args:         []string{"GET-INSTALL-PATH", "2/3.1/", "2/3.2", "3"},
+		curDir:       "0/1",
+		tidyOnly:     "",
+		expectedArgs: []string{"GET-INSTALL-PATH-IN-0-1-2-3.1", "GET-INSTALL-PATH-IN-0-1-2-3.2", "GET-INSTALL-PATH-IN-0-1"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: ""}},
+	}, {
+		description:  "tidy only environment variable specified",
+		dirsInTrees:  []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/2/3.3"},
+		buildFiles:   []string{"0/1/2/3.1/Android.bp", "0/1/2/3.2/Android.bp", "0/1/2/3.3/Android.bp"},
+		args:         []string{"GET-INSTALL-PATH", "3.1/", "3.2/", "3.3"},
+		curDir:       "0/1/2",
+		tidyOnly:     "1",
+		expectedArgs: []string{"tidy_only"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: ""}},
+	}, {
+		description:  "normal execution from top dir directory",
+		dirsInTrees:  []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/3", "0/2"},
+		buildFiles:   []string{"0/1/2/3.1/Android.bp", "0/1/2/3.2/Android.bp", "0/1/3/Android.bp", "0/2/Android.bp"},
+		args:         []string{"0/1/2/3.1", "0/1/2/3.2", "0/1/3", "0/2"},
+		curDir:       ".",
+		tidyOnly:     "",
+		expectedArgs: []string{"MODULES-IN-0-1-2-3.1", "MODULES-IN-0-1-2-3.2", "MODULES-IN-0-1-3", "MODULES-IN-0-2"},
+		expectedEnvVars: []envVar{
+			envVar{
+				name:  "ONE_SHOT_MAKEFILE",
+				value: ""}},
+	}}
+	for _, tt := range tests {
+		t.Run("build action BUILD_MODULES_IN_DIRS, "+tt.description, func(t *testing.T) {
+			testGetConfigArgs(t, tt, BUILD_MODULES_IN_DIRECTORIES, true)
+		})
+	}
+}
diff --git a/ui/build/context.go b/ui/build/context.go
index 249e898..3945ce0 100644
--- a/ui/build/context.go
+++ b/ui/build/context.go
@@ -16,12 +16,12 @@
 
 import (
 	"context"
+	"io"
 
 	"android/soong/ui/logger"
 	"android/soong/ui/metrics"
 	"android/soong/ui/metrics/metrics_proto"
 	"android/soong/ui/status"
-	"android/soong/ui/terminal"
 	"android/soong/ui/tracer"
 )
 
@@ -35,7 +35,7 @@
 
 	Metrics *metrics.Metrics
 
-	Writer terminal.Writer
+	Writer io.Writer
 	Status *status.Status
 
 	Thread tracer.Thread
@@ -70,7 +70,7 @@
 	if c.Metrics != nil {
 		realTime := end - begin
 		c.Metrics.SetTimeMetrics(
-			metrics_proto.PerfInfo{
+			soong_metrics_proto.PerfInfo{
 				Desc:      &desc,
 				Name:      &name,
 				StartTime: &begin,
diff --git a/ui/build/dumpvars.go b/ui/build/dumpvars.go
index 4335667..266130f 100644
--- a/ui/build/dumpvars.go
+++ b/ui/build/dumpvars.go
@@ -249,7 +249,7 @@
 	env := config.Environment()
 	// Print the banner like make does
 	if !env.IsEnvTrue("ANDROID_QUIET_BUILD") {
-		ctx.Writer.Print(Banner(make_vars))
+		fmt.Fprintln(ctx.Writer, Banner(make_vars))
 	}
 
 	// Populate the environment
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 4a30391..e2c5043 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -79,7 +79,6 @@
 	// We need bzip2 here even though we provide a bzip2 binary because
 	// GNU tar seems to avoid calling ours.
 	"bzip2":    Allowed,
-	"date":     Allowed,
 	"dd":       Allowed,
 	"diff":     Allowed,
 	"egrep":    Allowed,
@@ -89,23 +88,22 @@
 	"getopt":   Allowed,
 	"git":      Allowed,
 	"grep":     Allowed,
+	"gzcat":    Allowed,
 	"gzip":     Allowed,
 	"hexdump":  Allowed,
 	"jar":      Allowed,
 	"java":     Allowed,
 	"javap":    Allowed,
 	"lsof":     Allowed,
-	"m4":       Allowed,
+	"m4":       Log,
 	"openssl":  Allowed,
 	"patch":    Allowed,
 	"pstree":   Allowed,
 	"python3":  Allowed,
 	"realpath": Allowed,
 	"rsync":    Allowed,
-	"sed":      Allowed,
 	"sh":       Allowed,
 	"tar":      Allowed,
-	"timeout":  Allowed,
 	"tr":       Allowed,
 	"unzip":    Allowed,
 	"zip":      Allowed,
@@ -133,6 +131,7 @@
 	"cp":        LinuxOnlyPrebuilt,
 	"comm":      LinuxOnlyPrebuilt,
 	"cut":       LinuxOnlyPrebuilt,
+	"date":      LinuxOnlyPrebuilt,
 	"dirname":   LinuxOnlyPrebuilt,
 	"du":        LinuxOnlyPrebuilt,
 	"echo":      LinuxOnlyPrebuilt,
@@ -156,6 +155,7 @@
 	"readlink":  LinuxOnlyPrebuilt,
 	"rm":        LinuxOnlyPrebuilt,
 	"rmdir":     LinuxOnlyPrebuilt,
+	"sed":       LinuxOnlyPrebuilt,
 	"seq":       LinuxOnlyPrebuilt,
 	"setsid":    LinuxOnlyPrebuilt,
 	"sha1sum":   LinuxOnlyPrebuilt,
@@ -166,6 +166,7 @@
 	"stat":      LinuxOnlyPrebuilt,
 	"tail":      LinuxOnlyPrebuilt,
 	"tee":       LinuxOnlyPrebuilt,
+	"timeout":   LinuxOnlyPrebuilt,
 	"touch":     LinuxOnlyPrebuilt,
 	"true":      LinuxOnlyPrebuilt,
 	"uname":     LinuxOnlyPrebuilt,
diff --git a/ui/build/util.go b/ui/build/util.go
index 0676a86..75e6753 100644
--- a/ui/build/util.go
+++ b/ui/build/util.go
@@ -44,6 +44,17 @@
 	return indexList(s, list) != -1
 }
 
+// removeFromlist removes all occurrences of the string in list.
+func removeFromList(s string, list []string) []string {
+	filteredList := make([]string, 0, len(list))
+	for _, ls := range list {
+		if s != ls {
+			filteredList = append(filteredList, ls)
+		}
+	}
+	return filteredList
+}
+
 // ensureDirectoriesExist is a shortcut to os.MkdirAll, sending errors to the ctx logger.
 func ensureDirectoriesExist(ctx Context, dirs ...string) {
 	for _, dir := range dirs {
diff --git a/ui/metrics/metrics.go b/ui/metrics/metrics.go
index 790b67a..bc86f0a 100644
--- a/ui/metrics/metrics.go
+++ b/ui/metrics/metrics.go
@@ -33,19 +33,19 @@
 )
 
 type Metrics struct {
-	metrics    metrics_proto.MetricsBase
+	metrics    soong_metrics_proto.MetricsBase
 	TimeTracer TimeTracer
 }
 
 func New() (metrics *Metrics) {
 	m := &Metrics{
-		metrics:    metrics_proto.MetricsBase{},
+		metrics:    soong_metrics_proto.MetricsBase{},
 		TimeTracer: &timeTracerImpl{},
 	}
 	return m
 }
 
-func (m *Metrics) SetTimeMetrics(perf metrics_proto.PerfInfo) {
+func (m *Metrics) SetTimeMetrics(perf soong_metrics_proto.PerfInfo) {
 	switch perf.GetName() {
 	case RunKati:
 		m.metrics.KatiRuns = append(m.metrics.KatiRuns, &perf)
@@ -76,11 +76,11 @@
 		case "TARGET_BUILD_VARIANT":
 			switch v {
 			case "user":
-				m.metrics.TargetBuildVariant = metrics_proto.MetricsBase_USER.Enum()
+				m.metrics.TargetBuildVariant = soong_metrics_proto.MetricsBase_USER.Enum()
 			case "userdebug":
-				m.metrics.TargetBuildVariant = metrics_proto.MetricsBase_USERDEBUG.Enum()
+				m.metrics.TargetBuildVariant = soong_metrics_proto.MetricsBase_USERDEBUG.Enum()
 			case "eng":
-				m.metrics.TargetBuildVariant = metrics_proto.MetricsBase_ENG.Enum()
+				m.metrics.TargetBuildVariant = soong_metrics_proto.MetricsBase_ENG.Enum()
 			default:
 				// ignored
 			}
@@ -112,18 +112,18 @@
 	}
 }
 
-func (m *Metrics) getArch(arch string) *metrics_proto.MetricsBase_ARCH {
+func (m *Metrics) getArch(arch string) *soong_metrics_proto.MetricsBase_Arch {
 	switch arch {
 	case "arm":
-		return metrics_proto.MetricsBase_ARM.Enum()
+		return soong_metrics_proto.MetricsBase_ARM.Enum()
 	case "arm64":
-		return metrics_proto.MetricsBase_ARM64.Enum()
+		return soong_metrics_proto.MetricsBase_ARM64.Enum()
 	case "x86":
-		return metrics_proto.MetricsBase_X86.Enum()
+		return soong_metrics_proto.MetricsBase_X86.Enum()
 	case "x86_64":
-		return metrics_proto.MetricsBase_X86_64.Enum()
+		return soong_metrics_proto.MetricsBase_X86_64.Enum()
 	default:
-		return metrics_proto.MetricsBase_UNKNOWN.Enum()
+		return soong_metrics_proto.MetricsBase_UNKNOWN.Enum()
 	}
 }
 
@@ -148,7 +148,7 @@
 		return err
 	}
 	tempPath := outputPath + ".tmp"
-	err = ioutil.WriteFile(tempPath, []byte(data), 0777)
+	err = ioutil.WriteFile(tempPath, []byte(data), 0644)
 	if err != nil {
 		return err
 	}
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index feefc89..5486ec1 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -1,11 +1,13 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // source: metrics.proto
 
-package metrics_proto
+package soong_metrics_proto
 
-import proto "github.com/golang/protobuf/proto"
-import fmt "fmt"
-import math "math"
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	math "math"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
@@ -16,65 +18,70 @@
 // is compatible with the proto package it is being compiled against.
 // A compilation error at this line likely means your copy of the
 // proto package needs to be updated.
-const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
 
-type MetricsBase_BUILDVARIANT int32
+type MetricsBase_BuildVariant int32
 
 const (
-	MetricsBase_USER      MetricsBase_BUILDVARIANT = 0
-	MetricsBase_USERDEBUG MetricsBase_BUILDVARIANT = 1
-	MetricsBase_ENG       MetricsBase_BUILDVARIANT = 2
+	MetricsBase_USER      MetricsBase_BuildVariant = 0
+	MetricsBase_USERDEBUG MetricsBase_BuildVariant = 1
+	MetricsBase_ENG       MetricsBase_BuildVariant = 2
 )
 
-var MetricsBase_BUILDVARIANT_name = map[int32]string{
+var MetricsBase_BuildVariant_name = map[int32]string{
 	0: "USER",
 	1: "USERDEBUG",
 	2: "ENG",
 }
-var MetricsBase_BUILDVARIANT_value = map[string]int32{
+
+var MetricsBase_BuildVariant_value = map[string]int32{
 	"USER":      0,
 	"USERDEBUG": 1,
 	"ENG":       2,
 }
 
-func (x MetricsBase_BUILDVARIANT) Enum() *MetricsBase_BUILDVARIANT {
-	p := new(MetricsBase_BUILDVARIANT)
+func (x MetricsBase_BuildVariant) Enum() *MetricsBase_BuildVariant {
+	p := new(MetricsBase_BuildVariant)
 	*p = x
 	return p
 }
-func (x MetricsBase_BUILDVARIANT) String() string {
-	return proto.EnumName(MetricsBase_BUILDVARIANT_name, int32(x))
+
+func (x MetricsBase_BuildVariant) String() string {
+	return proto.EnumName(MetricsBase_BuildVariant_name, int32(x))
 }
-func (x *MetricsBase_BUILDVARIANT) UnmarshalJSON(data []byte) error {
-	value, err := proto.UnmarshalJSONEnum(MetricsBase_BUILDVARIANT_value, data, "MetricsBase_BUILDVARIANT")
+
+func (x *MetricsBase_BuildVariant) UnmarshalJSON(data []byte) error {
+	value, err := proto.UnmarshalJSONEnum(MetricsBase_BuildVariant_value, data, "MetricsBase_BuildVariant")
 	if err != nil {
 		return err
 	}
-	*x = MetricsBase_BUILDVARIANT(value)
+	*x = MetricsBase_BuildVariant(value)
 	return nil
 }
-func (MetricsBase_BUILDVARIANT) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_metrics_9e7b895801991242, []int{0, 0}
+
+func (MetricsBase_BuildVariant) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_6039342a2ba47b72, []int{0, 0}
 }
 
-type MetricsBase_ARCH int32
+type MetricsBase_Arch int32
 
 const (
-	MetricsBase_UNKNOWN MetricsBase_ARCH = 0
-	MetricsBase_ARM     MetricsBase_ARCH = 1
-	MetricsBase_ARM64   MetricsBase_ARCH = 2
-	MetricsBase_X86     MetricsBase_ARCH = 3
-	MetricsBase_X86_64  MetricsBase_ARCH = 4
+	MetricsBase_UNKNOWN MetricsBase_Arch = 0
+	MetricsBase_ARM     MetricsBase_Arch = 1
+	MetricsBase_ARM64   MetricsBase_Arch = 2
+	MetricsBase_X86     MetricsBase_Arch = 3
+	MetricsBase_X86_64  MetricsBase_Arch = 4
 )
 
-var MetricsBase_ARCH_name = map[int32]string{
+var MetricsBase_Arch_name = map[int32]string{
 	0: "UNKNOWN",
 	1: "ARM",
 	2: "ARM64",
 	3: "X86",
 	4: "X86_64",
 }
-var MetricsBase_ARCH_value = map[string]int32{
+
+var MetricsBase_Arch_value = map[string]int32{
 	"UNKNOWN": 0,
 	"ARM":     1,
 	"ARM64":   2,
@@ -82,63 +89,70 @@
 	"X86_64":  4,
 }
 
-func (x MetricsBase_ARCH) Enum() *MetricsBase_ARCH {
-	p := new(MetricsBase_ARCH)
+func (x MetricsBase_Arch) Enum() *MetricsBase_Arch {
+	p := new(MetricsBase_Arch)
 	*p = x
 	return p
 }
-func (x MetricsBase_ARCH) String() string {
-	return proto.EnumName(MetricsBase_ARCH_name, int32(x))
+
+func (x MetricsBase_Arch) String() string {
+	return proto.EnumName(MetricsBase_Arch_name, int32(x))
 }
-func (x *MetricsBase_ARCH) UnmarshalJSON(data []byte) error {
-	value, err := proto.UnmarshalJSONEnum(MetricsBase_ARCH_value, data, "MetricsBase_ARCH")
+
+func (x *MetricsBase_Arch) UnmarshalJSON(data []byte) error {
+	value, err := proto.UnmarshalJSONEnum(MetricsBase_Arch_value, data, "MetricsBase_Arch")
 	if err != nil {
 		return err
 	}
-	*x = MetricsBase_ARCH(value)
+	*x = MetricsBase_Arch(value)
 	return nil
 }
-func (MetricsBase_ARCH) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_metrics_9e7b895801991242, []int{0, 1}
+
+func (MetricsBase_Arch) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_6039342a2ba47b72, []int{0, 1}
 }
 
-type ModuleTypeInfo_BUILDSYSTEM int32
+type ModuleTypeInfo_BuildSystem int32
 
 const (
-	ModuleTypeInfo_UNKNOWN ModuleTypeInfo_BUILDSYSTEM = 0
-	ModuleTypeInfo_SOONG   ModuleTypeInfo_BUILDSYSTEM = 1
-	ModuleTypeInfo_MAKE    ModuleTypeInfo_BUILDSYSTEM = 2
+	ModuleTypeInfo_UNKNOWN ModuleTypeInfo_BuildSystem = 0
+	ModuleTypeInfo_SOONG   ModuleTypeInfo_BuildSystem = 1
+	ModuleTypeInfo_MAKE    ModuleTypeInfo_BuildSystem = 2
 )
 
-var ModuleTypeInfo_BUILDSYSTEM_name = map[int32]string{
+var ModuleTypeInfo_BuildSystem_name = map[int32]string{
 	0: "UNKNOWN",
 	1: "SOONG",
 	2: "MAKE",
 }
-var ModuleTypeInfo_BUILDSYSTEM_value = map[string]int32{
+
+var ModuleTypeInfo_BuildSystem_value = map[string]int32{
 	"UNKNOWN": 0,
 	"SOONG":   1,
 	"MAKE":    2,
 }
 
-func (x ModuleTypeInfo_BUILDSYSTEM) Enum() *ModuleTypeInfo_BUILDSYSTEM {
-	p := new(ModuleTypeInfo_BUILDSYSTEM)
+func (x ModuleTypeInfo_BuildSystem) Enum() *ModuleTypeInfo_BuildSystem {
+	p := new(ModuleTypeInfo_BuildSystem)
 	*p = x
 	return p
 }
-func (x ModuleTypeInfo_BUILDSYSTEM) String() string {
-	return proto.EnumName(ModuleTypeInfo_BUILDSYSTEM_name, int32(x))
+
+func (x ModuleTypeInfo_BuildSystem) String() string {
+	return proto.EnumName(ModuleTypeInfo_BuildSystem_name, int32(x))
 }
-func (x *ModuleTypeInfo_BUILDSYSTEM) UnmarshalJSON(data []byte) error {
-	value, err := proto.UnmarshalJSONEnum(ModuleTypeInfo_BUILDSYSTEM_value, data, "ModuleTypeInfo_BUILDSYSTEM")
+
+func (x *ModuleTypeInfo_BuildSystem) UnmarshalJSON(data []byte) error {
+	value, err := proto.UnmarshalJSONEnum(ModuleTypeInfo_BuildSystem_value, data, "ModuleTypeInfo_BuildSystem")
 	if err != nil {
 		return err
 	}
-	*x = ModuleTypeInfo_BUILDSYSTEM(value)
+	*x = ModuleTypeInfo_BuildSystem(value)
 	return nil
 }
-func (ModuleTypeInfo_BUILDSYSTEM) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_metrics_9e7b895801991242, []int{2, 0}
+
+func (ModuleTypeInfo_BuildSystem) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_6039342a2ba47b72, []int{2, 0}
 }
 
 type MetricsBase struct {
@@ -151,17 +165,17 @@
 	// The target product information, eg. aosp_arm.
 	TargetProduct *string `protobuf:"bytes,4,opt,name=target_product,json=targetProduct" json:"target_product,omitempty"`
 	// The target build variant information, eg. eng.
-	TargetBuildVariant *MetricsBase_BUILDVARIANT `protobuf:"varint,5,opt,name=target_build_variant,json=targetBuildVariant,enum=build_metrics.MetricsBase_BUILDVARIANT,def=2" json:"target_build_variant,omitempty"`
+	TargetBuildVariant *MetricsBase_BuildVariant `protobuf:"varint,5,opt,name=target_build_variant,json=targetBuildVariant,enum=soong_build_metrics.MetricsBase_BuildVariant,def=2" json:"target_build_variant,omitempty"`
 	// The target arch information, eg. arm.
-	TargetArch *MetricsBase_ARCH `protobuf:"varint,6,opt,name=target_arch,json=targetArch,enum=build_metrics.MetricsBase_ARCH,def=0" json:"target_arch,omitempty"`
+	TargetArch *MetricsBase_Arch `protobuf:"varint,6,opt,name=target_arch,json=targetArch,enum=soong_build_metrics.MetricsBase_Arch,def=0" json:"target_arch,omitempty"`
 	// The target arch variant information, eg. armv7-a-neon.
 	TargetArchVariant *string `protobuf:"bytes,7,opt,name=target_arch_variant,json=targetArchVariant" json:"target_arch_variant,omitempty"`
 	// The target cpu variant information, eg. generic.
 	TargetCpuVariant *string `protobuf:"bytes,8,opt,name=target_cpu_variant,json=targetCpuVariant" json:"target_cpu_variant,omitempty"`
 	// The host arch information, eg. x86_64.
-	HostArch *MetricsBase_ARCH `protobuf:"varint,9,opt,name=host_arch,json=hostArch,enum=build_metrics.MetricsBase_ARCH,def=0" json:"host_arch,omitempty"`
+	HostArch *MetricsBase_Arch `protobuf:"varint,9,opt,name=host_arch,json=hostArch,enum=soong_build_metrics.MetricsBase_Arch,def=0" json:"host_arch,omitempty"`
 	// The host 2nd arch information, eg. x86.
-	Host_2NdArch *MetricsBase_ARCH `protobuf:"varint,10,opt,name=host_2nd_arch,json=host2ndArch,enum=build_metrics.MetricsBase_ARCH,def=0" json:"host_2nd_arch,omitempty"`
+	Host_2NdArch *MetricsBase_Arch `protobuf:"varint,10,opt,name=host_2nd_arch,json=host2ndArch,enum=soong_build_metrics.MetricsBase_Arch,def=0" json:"host_2nd_arch,omitempty"`
 	// The host os information, eg. linux.
 	HostOs *string `protobuf:"bytes,11,opt,name=host_os,json=hostOs" json:"host_os,omitempty"`
 	// The host os extra information, eg. Linux-4.17.0-3rodete2-amd64-x86_64-Debian-GNU.
@@ -191,16 +205,17 @@
 func (m *MetricsBase) String() string { return proto.CompactTextString(m) }
 func (*MetricsBase) ProtoMessage()    {}
 func (*MetricsBase) Descriptor() ([]byte, []int) {
-	return fileDescriptor_metrics_9e7b895801991242, []int{0}
+	return fileDescriptor_6039342a2ba47b72, []int{0}
 }
+
 func (m *MetricsBase) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_MetricsBase.Unmarshal(m, b)
 }
 func (m *MetricsBase) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_MetricsBase.Marshal(b, m, deterministic)
 }
-func (dst *MetricsBase) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_MetricsBase.Merge(dst, src)
+func (m *MetricsBase) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_MetricsBase.Merge(m, src)
 }
 func (m *MetricsBase) XXX_Size() int {
 	return xxx_messageInfo_MetricsBase.Size(m)
@@ -211,10 +226,10 @@
 
 var xxx_messageInfo_MetricsBase proto.InternalMessageInfo
 
-const Default_MetricsBase_TargetBuildVariant MetricsBase_BUILDVARIANT = MetricsBase_ENG
-const Default_MetricsBase_TargetArch MetricsBase_ARCH = MetricsBase_UNKNOWN
-const Default_MetricsBase_HostArch MetricsBase_ARCH = MetricsBase_UNKNOWN
-const Default_MetricsBase_Host_2NdArch MetricsBase_ARCH = MetricsBase_UNKNOWN
+const Default_MetricsBase_TargetBuildVariant MetricsBase_BuildVariant = MetricsBase_ENG
+const Default_MetricsBase_TargetArch MetricsBase_Arch = MetricsBase_UNKNOWN
+const Default_MetricsBase_HostArch MetricsBase_Arch = MetricsBase_UNKNOWN
+const Default_MetricsBase_Host_2NdArch MetricsBase_Arch = MetricsBase_UNKNOWN
 
 func (m *MetricsBase) GetBuildDateTimestamp() int64 {
 	if m != nil && m.BuildDateTimestamp != nil {
@@ -244,14 +259,14 @@
 	return ""
 }
 
-func (m *MetricsBase) GetTargetBuildVariant() MetricsBase_BUILDVARIANT {
+func (m *MetricsBase) GetTargetBuildVariant() MetricsBase_BuildVariant {
 	if m != nil && m.TargetBuildVariant != nil {
 		return *m.TargetBuildVariant
 	}
 	return Default_MetricsBase_TargetBuildVariant
 }
 
-func (m *MetricsBase) GetTargetArch() MetricsBase_ARCH {
+func (m *MetricsBase) GetTargetArch() MetricsBase_Arch {
 	if m != nil && m.TargetArch != nil {
 		return *m.TargetArch
 	}
@@ -272,14 +287,14 @@
 	return ""
 }
 
-func (m *MetricsBase) GetHostArch() MetricsBase_ARCH {
+func (m *MetricsBase) GetHostArch() MetricsBase_Arch {
 	if m != nil && m.HostArch != nil {
 		return *m.HostArch
 	}
 	return Default_MetricsBase_HostArch
 }
 
-func (m *MetricsBase) GetHost_2NdArch() MetricsBase_ARCH {
+func (m *MetricsBase) GetHost_2NdArch() MetricsBase_Arch {
 	if m != nil && m.Host_2NdArch != nil {
 		return *m.Host_2NdArch
 	}
@@ -378,16 +393,17 @@
 func (m *PerfInfo) String() string { return proto.CompactTextString(m) }
 func (*PerfInfo) ProtoMessage()    {}
 func (*PerfInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_metrics_9e7b895801991242, []int{1}
+	return fileDescriptor_6039342a2ba47b72, []int{1}
 }
+
 func (m *PerfInfo) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_PerfInfo.Unmarshal(m, b)
 }
 func (m *PerfInfo) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_PerfInfo.Marshal(b, m, deterministic)
 }
-func (dst *PerfInfo) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_PerfInfo.Merge(dst, src)
+func (m *PerfInfo) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_PerfInfo.Merge(m, src)
 }
 func (m *PerfInfo) XXX_Size() int {
 	return xxx_messageInfo_PerfInfo.Size(m)
@@ -435,7 +451,7 @@
 
 type ModuleTypeInfo struct {
 	// The build system, eg. Soong or Make.
-	BuildSystem *ModuleTypeInfo_BUILDSYSTEM `protobuf:"varint,1,opt,name=build_system,json=buildSystem,enum=build_metrics.ModuleTypeInfo_BUILDSYSTEM,def=0" json:"build_system,omitempty"`
+	BuildSystem *ModuleTypeInfo_BuildSystem `protobuf:"varint,1,opt,name=build_system,json=buildSystem,enum=soong_build_metrics.ModuleTypeInfo_BuildSystem,def=0" json:"build_system,omitempty"`
 	// The module type, eg. java_library, cc_binary, and etc.
 	ModuleType *string `protobuf:"bytes,2,opt,name=module_type,json=moduleType" json:"module_type,omitempty"`
 	// The number of logical modules.
@@ -449,16 +465,17 @@
 func (m *ModuleTypeInfo) String() string { return proto.CompactTextString(m) }
 func (*ModuleTypeInfo) ProtoMessage()    {}
 func (*ModuleTypeInfo) Descriptor() ([]byte, []int) {
-	return fileDescriptor_metrics_9e7b895801991242, []int{2}
+	return fileDescriptor_6039342a2ba47b72, []int{2}
 }
+
 func (m *ModuleTypeInfo) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_ModuleTypeInfo.Unmarshal(m, b)
 }
 func (m *ModuleTypeInfo) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_ModuleTypeInfo.Marshal(b, m, deterministic)
 }
-func (dst *ModuleTypeInfo) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_ModuleTypeInfo.Merge(dst, src)
+func (m *ModuleTypeInfo) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_ModuleTypeInfo.Merge(m, src)
 }
 func (m *ModuleTypeInfo) XXX_Size() int {
 	return xxx_messageInfo_ModuleTypeInfo.Size(m)
@@ -469,9 +486,9 @@
 
 var xxx_messageInfo_ModuleTypeInfo proto.InternalMessageInfo
 
-const Default_ModuleTypeInfo_BuildSystem ModuleTypeInfo_BUILDSYSTEM = ModuleTypeInfo_UNKNOWN
+const Default_ModuleTypeInfo_BuildSystem ModuleTypeInfo_BuildSystem = ModuleTypeInfo_UNKNOWN
 
-func (m *ModuleTypeInfo) GetBuildSystem() ModuleTypeInfo_BUILDSYSTEM {
+func (m *ModuleTypeInfo) GetBuildSystem() ModuleTypeInfo_BuildSystem {
 	if m != nil && m.BuildSystem != nil {
 		return *m.BuildSystem
 	}
@@ -493,65 +510,65 @@
 }
 
 func init() {
-	proto.RegisterType((*MetricsBase)(nil), "build_metrics.MetricsBase")
-	proto.RegisterType((*PerfInfo)(nil), "build_metrics.PerfInfo")
-	proto.RegisterType((*ModuleTypeInfo)(nil), "build_metrics.ModuleTypeInfo")
-	proto.RegisterEnum("build_metrics.MetricsBase_BUILDVARIANT", MetricsBase_BUILDVARIANT_name, MetricsBase_BUILDVARIANT_value)
-	proto.RegisterEnum("build_metrics.MetricsBase_ARCH", MetricsBase_ARCH_name, MetricsBase_ARCH_value)
-	proto.RegisterEnum("build_metrics.ModuleTypeInfo_BUILDSYSTEM", ModuleTypeInfo_BUILDSYSTEM_name, ModuleTypeInfo_BUILDSYSTEM_value)
+	proto.RegisterEnum("soong_build_metrics.MetricsBase_BuildVariant", MetricsBase_BuildVariant_name, MetricsBase_BuildVariant_value)
+	proto.RegisterEnum("soong_build_metrics.MetricsBase_Arch", MetricsBase_Arch_name, MetricsBase_Arch_value)
+	proto.RegisterEnum("soong_build_metrics.ModuleTypeInfo_BuildSystem", ModuleTypeInfo_BuildSystem_name, ModuleTypeInfo_BuildSystem_value)
+	proto.RegisterType((*MetricsBase)(nil), "soong_build_metrics.MetricsBase")
+	proto.RegisterType((*PerfInfo)(nil), "soong_build_metrics.PerfInfo")
+	proto.RegisterType((*ModuleTypeInfo)(nil), "soong_build_metrics.ModuleTypeInfo")
 }
 
-func init() { proto.RegisterFile("metrics.proto", fileDescriptor_metrics_9e7b895801991242) }
+func init() { proto.RegisterFile("metrics.proto", fileDescriptor_6039342a2ba47b72) }
 
-var fileDescriptor_metrics_9e7b895801991242 = []byte{
-	// 783 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x94, 0x55, 0xdd, 0x6e, 0xdb, 0x36,
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-	0x32, 0xff, 0x75, 0xbe, 0x18, 0x4d, 0x6a, 0x57, 0x03, 0x25, 0x73, 0xb4, 0x21, 0x2f, 0xc0, 0xcb,
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-	0x25, 0xfc, 0x1f, 0x00, 0x00, 0xff, 0xff, 0xd4, 0x8d, 0x19, 0x89, 0x22, 0x06, 0x00, 0x00,
+var fileDescriptor_6039342a2ba47b72 = []byte{
+	// 769 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x9c, 0x55, 0x6f, 0x6b, 0xdb, 0x46,
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+	0x61, 0xaa, 0xdf, 0xe1, 0xd8, 0x9c, 0x9b, 0xdc, 0x49, 0xc5, 0x32, 0x4c, 0xd7, 0x1d, 0xbd, 0xbc,
+	0xff, 0xba, 0xdc, 0x91, 0x9a, 0x61, 0x74, 0x85, 0xb2, 0xc6, 0xc5, 0xf9, 0x7c, 0x5b, 0x25, 0x3f,
+	0x80, 0x97, 0xa1, 0x86, 0xaa, 0x5d, 0x51, 0x77, 0x09, 0xd9, 0xde, 0x86, 0xfc, 0x08, 0xdd, 0xbc,
+	0xcc, 0x28, 0xdf, 0x50, 0x53, 0x94, 0xd8, 0x6f, 0x27, 0x3c, 0xce, 0xcb, 0x6c, 0xb5, 0x31, 0xfb,
+	0xc9, 0xfe, 0x4b, 0xf0, 0x1a, 0x7b, 0xdd, 0x7d, 0x17, 0x2e, 0x1c, 0x5e, 0xad, 0x56, 0x4b, 0xfd,
+	0xd2, 0x1c, 0xb0, 0x17, 0xd3, 0xcb, 0xb9, 0x7f, 0x30, 0xfb, 0xee, 0xb7, 0xea, 0xef, 0x51, 0x25,
+	0xa7, 0xf8, 0x4b, 0xf9, 0x2f, 0x00, 0x00, 0xff, 0xff, 0x81, 0xd0, 0x84, 0x23, 0x62, 0x06, 0x00,
+	0x00,
 }
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index b3de2f4..93034eb 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -14,10 +14,8 @@
 
 syntax = "proto2";
 
-option optimize_for = LITE_RUNTIME;
-
-package build_metrics;
-option go_package = "metrics_proto";
+package soong_build_metrics;
+option go_package = "soong_metrics_proto";
 
 message MetricsBase {
   // Timestamp generated when the build starts.
@@ -32,15 +30,15 @@
   // The target product information, eg. aosp_arm.
   optional string target_product = 4;
 
-  enum BUILDVARIANT {
+  enum BuildVariant {
     USER = 0;
     USERDEBUG = 1;
     ENG = 2;
   }
   // The target build variant information, eg. eng.
-  optional BUILDVARIANT target_build_variant = 5 [default = ENG];
+  optional BuildVariant target_build_variant = 5 [default = ENG];
 
-  enum ARCH {
+  enum Arch {
     UNKNOWN = 0;
     ARM = 1;
     ARM64 = 2;
@@ -48,7 +46,7 @@
     X86_64 = 4;
   }
   // The target arch information, eg. arm.
-  optional ARCH target_arch = 6 [default = UNKNOWN];
+  optional Arch target_arch = 6 [default = UNKNOWN];
 
   // The target arch variant information, eg. armv7-a-neon.
   optional string target_arch_variant = 7;
@@ -57,10 +55,10 @@
   optional string target_cpu_variant = 8;
 
   // The host arch information, eg. x86_64.
-  optional ARCH host_arch = 9 [default = UNKNOWN];
+  optional Arch host_arch = 9 [default = UNKNOWN];
 
   // The host 2nd arch information, eg. x86.
-  optional ARCH host_2nd_arch = 10 [default = UNKNOWN];
+  optional Arch host_2nd_arch = 10 [default = UNKNOWN];
 
   // The host os information, eg. linux.
   optional string host_os = 11;
@@ -113,13 +111,13 @@
 }
 
 message ModuleTypeInfo {
-  enum BUILDSYSTEM {
+  enum BuildSystem {
     UNKNOWN = 0;
     SOONG = 1;
     MAKE = 2;
   }
   // The build system, eg. Soong or Make.
-  optional BUILDSYSTEM build_system = 1 [default = UNKNOWN];
+  optional BuildSystem build_system = 1 [default = UNKNOWN];
 
   // The module type, eg. java_library, cc_binary, and etc.
   optional string module_type = 2;
diff --git a/ui/metrics/time.go b/ui/metrics/time.go
index 7e8801a..b8baf16 100644
--- a/ui/metrics/time.go
+++ b/ui/metrics/time.go
@@ -30,7 +30,7 @@
 
 type TimeTracer interface {
 	Begin(name, desc string, thread tracer.Thread)
-	End(thread tracer.Thread) metrics_proto.PerfInfo
+	End(thread tracer.Thread) soong_metrics_proto.PerfInfo
 }
 
 type timeTracerImpl struct {
@@ -51,11 +51,11 @@
 	t.activeEvents = append(t.activeEvents, timeEvent{name: name, desc: desc, atNanos: atNanos})
 }
 
-func (t *timeTracerImpl) End(thread tracer.Thread) metrics_proto.PerfInfo {
+func (t *timeTracerImpl) End(thread tracer.Thread) soong_metrics_proto.PerfInfo {
 	return t.endAt(t.now())
 }
 
-func (t *timeTracerImpl) endAt(atNanos uint64) metrics_proto.PerfInfo {
+func (t *timeTracerImpl) endAt(atNanos uint64) soong_metrics_proto.PerfInfo {
 	if len(t.activeEvents) < 1 {
 		panic("Internal error: No pending events for endAt to end!")
 	}
@@ -63,7 +63,7 @@
 	t.activeEvents = t.activeEvents[:len(t.activeEvents)-1]
 	realTime := atNanos - lastEvent.atNanos
 
-	return metrics_proto.PerfInfo{
+	return soong_metrics_proto.PerfInfo{
 		Desc:      &lastEvent.desc,
 		Name:      &lastEvent.name,
 		StartTime: &lastEvent.atNanos,
diff --git a/ui/status/Android.bp b/ui/status/Android.bp
index 901a713..ec929b3 100644
--- a/ui/status/Android.bp
+++ b/ui/status/Android.bp
@@ -19,14 +19,17 @@
         "golang-protobuf-proto",
         "soong-ui-logger",
         "soong-ui-status-ninja_frontend",
+        "soong-ui-status-build_error_proto",
     ],
     srcs: [
+        "critical_path.go",
         "kati.go",
         "log.go",
         "ninja.go",
         "status.go",
     ],
     testSrcs: [
+        "critical_path_test.go",
         "kati_test.go",
         "ninja_test.go",
         "status_test.go",
@@ -41,3 +44,12 @@
         "ninja_frontend/frontend.pb.go",
     ],
 }
+
+bootstrap_go_package {
+    name: "soong-ui-status-build_error_proto",
+    pkgPath: "android/soong/ui/status/build_error_proto",
+    deps: ["golang-protobuf-proto"],
+    srcs: [
+        "build_error_proto/build_error.pb.go",
+    ],
+}
diff --git a/ui/status/build_error_proto/build_error.pb.go b/ui/status/build_error_proto/build_error.pb.go
new file mode 100644
index 0000000..d4d0a6e
--- /dev/null
+++ b/ui/status/build_error_proto/build_error.pb.go
@@ -0,0 +1,175 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: build_error.proto
+
+package soong_build_error_proto
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+type BuildError struct {
+	// List of error messages of the overall build. The error messages
+	// are not associated with a build action.
+	ErrorMessages []string `protobuf:"bytes,1,rep,name=error_messages,json=errorMessages" json:"error_messages,omitempty"`
+	// List of build action errors.
+	ActionErrors         []*BuildActionError `protobuf:"bytes,2,rep,name=action_errors,json=actionErrors" json:"action_errors,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}            `json:"-"`
+	XXX_unrecognized     []byte              `json:"-"`
+	XXX_sizecache        int32               `json:"-"`
+}
+
+func (m *BuildError) Reset()         { *m = BuildError{} }
+func (m *BuildError) String() string { return proto.CompactTextString(m) }
+func (*BuildError) ProtoMessage()    {}
+func (*BuildError) Descriptor() ([]byte, []int) {
+	return fileDescriptor_a2e15b05802a5501, []int{0}
+}
+
+func (m *BuildError) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_BuildError.Unmarshal(m, b)
+}
+func (m *BuildError) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_BuildError.Marshal(b, m, deterministic)
+}
+func (m *BuildError) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_BuildError.Merge(m, src)
+}
+func (m *BuildError) XXX_Size() int {
+	return xxx_messageInfo_BuildError.Size(m)
+}
+func (m *BuildError) XXX_DiscardUnknown() {
+	xxx_messageInfo_BuildError.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_BuildError proto.InternalMessageInfo
+
+func (m *BuildError) GetErrorMessages() []string {
+	if m != nil {
+		return m.ErrorMessages
+	}
+	return nil
+}
+
+func (m *BuildError) GetActionErrors() []*BuildActionError {
+	if m != nil {
+		return m.ActionErrors
+	}
+	return nil
+}
+
+// Build is composed of a list of build action. There can be a set of build
+// actions that can failed.
+type BuildActionError struct {
+	// Description of the command.
+	Description *string `protobuf:"bytes,1,opt,name=description" json:"description,omitempty"`
+	// The command name that raised the error.
+	Command *string `protobuf:"bytes,2,opt,name=command" json:"command,omitempty"`
+	// The command output stream.
+	Output *string `protobuf:"bytes,3,opt,name=output" json:"output,omitempty"`
+	// List of artifacts (i.e. files) that was produced by the command.
+	Artifacts []string `protobuf:"bytes,4,rep,name=artifacts" json:"artifacts,omitempty"`
+	// The error string produced by the build action.
+	Error                *string  `protobuf:"bytes,5,opt,name=error" json:"error,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *BuildActionError) Reset()         { *m = BuildActionError{} }
+func (m *BuildActionError) String() string { return proto.CompactTextString(m) }
+func (*BuildActionError) ProtoMessage()    {}
+func (*BuildActionError) Descriptor() ([]byte, []int) {
+	return fileDescriptor_a2e15b05802a5501, []int{1}
+}
+
+func (m *BuildActionError) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_BuildActionError.Unmarshal(m, b)
+}
+func (m *BuildActionError) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_BuildActionError.Marshal(b, m, deterministic)
+}
+func (m *BuildActionError) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_BuildActionError.Merge(m, src)
+}
+func (m *BuildActionError) XXX_Size() int {
+	return xxx_messageInfo_BuildActionError.Size(m)
+}
+func (m *BuildActionError) XXX_DiscardUnknown() {
+	xxx_messageInfo_BuildActionError.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_BuildActionError proto.InternalMessageInfo
+
+func (m *BuildActionError) GetDescription() string {
+	if m != nil && m.Description != nil {
+		return *m.Description
+	}
+	return ""
+}
+
+func (m *BuildActionError) GetCommand() string {
+	if m != nil && m.Command != nil {
+		return *m.Command
+	}
+	return ""
+}
+
+func (m *BuildActionError) GetOutput() string {
+	if m != nil && m.Output != nil {
+		return *m.Output
+	}
+	return ""
+}
+
+func (m *BuildActionError) GetArtifacts() []string {
+	if m != nil {
+		return m.Artifacts
+	}
+	return nil
+}
+
+func (m *BuildActionError) GetError() string {
+	if m != nil && m.Error != nil {
+		return *m.Error
+	}
+	return ""
+}
+
+func init() {
+	proto.RegisterType((*BuildError)(nil), "soong_build_error.BuildError")
+	proto.RegisterType((*BuildActionError)(nil), "soong_build_error.BuildActionError")
+}
+
+func init() { proto.RegisterFile("build_error.proto", fileDescriptor_a2e15b05802a5501) }
+
+var fileDescriptor_a2e15b05802a5501 = []byte{
+	// 229 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x64, 0x90, 0xc1, 0x4a, 0xc3, 0x40,
+	0x10, 0x86, 0x49, 0x63, 0x95, 0x4c, 0xad, 0xd8, 0x41, 0x74, 0x04, 0x0f, 0xa1, 0x22, 0xe4, 0x94,
+	0x83, 0x6f, 0x60, 0x41, 0xf0, 0xe2, 0x25, 0x47, 0x2f, 0x61, 0xdd, 0xac, 0x65, 0xc1, 0x64, 0xc2,
+	0xce, 0xe6, 0xe8, 0x8b, 0xf8, 0xb4, 0x92, 0x69, 0xa5, 0xa5, 0x39, 0x7e, 0xdf, 0x3f, 0xfb, 0xef,
+	0xce, 0xc2, 0xea, 0x73, 0xf0, 0xdf, 0x4d, 0xed, 0x42, 0xe0, 0x50, 0xf6, 0x81, 0x23, 0xe3, 0x4a,
+	0x98, 0xbb, 0x6d, 0x7d, 0x14, 0xac, 0x7f, 0x00, 0x36, 0x23, 0xbe, 0x8e, 0x84, 0x4f, 0x70, 0xa5,
+	0xba, 0x6e, 0x9d, 0x88, 0xd9, 0x3a, 0xa1, 0x24, 0x4f, 0x8b, 0xac, 0x5a, 0xaa, 0x7d, 0xdf, 0x4b,
+	0x7c, 0x83, 0xa5, 0xb1, 0xd1, 0x73, 0xb7, 0x2b, 0x11, 0x9a, 0xe5, 0x69, 0xb1, 0x78, 0x7e, 0x2c,
+	0x27, 0xfd, 0xa5, 0x96, 0xbf, 0xe8, 0xb0, 0x5e, 0x51, 0x5d, 0x9a, 0x03, 0xc8, 0xfa, 0x37, 0x81,
+	0xeb, 0xd3, 0x11, 0xcc, 0x61, 0xd1, 0x38, 0xb1, 0xc1, 0xf7, 0xa3, 0xa3, 0x24, 0x4f, 0x8a, 0xac,
+	0x3a, 0x56, 0x48, 0x70, 0x61, 0xb9, 0x6d, 0x4d, 0xd7, 0xd0, 0x4c, 0xd3, 0x7f, 0xc4, 0x5b, 0x38,
+	0xe7, 0x21, 0xf6, 0x43, 0xa4, 0x54, 0x83, 0x3d, 0xe1, 0x03, 0x64, 0x26, 0x44, 0xff, 0x65, 0x6c,
+	0x14, 0x3a, 0xd3, 0xa5, 0x0e, 0x02, 0x6f, 0x60, 0xae, 0xcf, 0xa5, 0xb9, 0x1e, 0xda, 0xc1, 0xe6,
+	0xfe, 0xe3, 0x6e, 0xb2, 0x50, 0xad, 0x3f, 0xf9, 0x17, 0x00, 0x00, 0xff, 0xff, 0xb6, 0x18, 0x9e,
+	0x17, 0x5d, 0x01, 0x00, 0x00,
+}
diff --git a/ui/status/build_error_proto/build_error.proto b/ui/status/build_error_proto/build_error.proto
new file mode 100644
index 0000000..9c8470d
--- /dev/null
+++ b/ui/status/build_error_proto/build_error.proto
@@ -0,0 +1,46 @@
+// Copyright 2019 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+
+package soong_build_error;
+option go_package = "soong_build_error_proto";
+
+message BuildError {
+  // List of error messages of the overall build. The error messages
+  // are not associated with a build action.
+  repeated string error_messages = 1;
+
+  // List of build action errors.
+  repeated BuildActionError action_errors = 2;
+}
+
+// Build is composed of a list of build action. There can be a set of build
+// actions that can failed.
+message BuildActionError {
+  // Description of the command.
+  optional string description = 1;
+
+  // The command name that raised the error.
+  optional string command = 2;
+
+  // The command output stream.
+  optional string output = 3;
+
+  // List of artifacts (i.e. files) that was produced by the command.
+  repeated string artifacts = 4;
+
+  // The error string produced by the build action.
+  optional string error = 5;
+}
diff --git a/ui/status/build_error_proto/regen.sh b/ui/status/build_error_proto/regen.sh
new file mode 100755
index 0000000..7c3ec8f
--- /dev/null
+++ b/ui/status/build_error_proto/regen.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+aprotoc --go_out=paths=source_relative:. build_error.proto
diff --git a/ui/status/critical_path.go b/ui/status/critical_path.go
new file mode 100644
index 0000000..444327b
--- /dev/null
+++ b/ui/status/critical_path.go
@@ -0,0 +1,152 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package status
+
+import (
+	"time"
+
+	"android/soong/ui/logger"
+)
+
+func NewCriticalPath(log logger.Logger) StatusOutput {
+	return &criticalPath{
+		log:     log,
+		running: make(map[*Action]time.Time),
+		nodes:   make(map[string]*node),
+		clock:   osClock{},
+	}
+}
+
+type criticalPath struct {
+	log logger.Logger
+
+	nodes   map[string]*node
+	running map[*Action]time.Time
+
+	start, end time.Time
+
+	clock clock
+}
+
+type clock interface {
+	Now() time.Time
+}
+
+type osClock struct{}
+
+func (osClock) Now() time.Time { return time.Now() }
+
+// A critical path node stores the critical path (the minimum time to build the node and all of its dependencies given
+// perfect parallelism) for an node.
+type node struct {
+	action             *Action
+	cumulativeDuration time.Duration
+	duration           time.Duration
+	input              *node
+}
+
+func (cp *criticalPath) StartAction(action *Action, counts Counts) {
+	start := cp.clock.Now()
+	if cp.start.IsZero() {
+		cp.start = start
+	}
+	cp.running[action] = start
+}
+
+func (cp *criticalPath) FinishAction(result ActionResult, counts Counts) {
+	if start, ok := cp.running[result.Action]; ok {
+		delete(cp.running, result.Action)
+
+		// Determine the input to this edge with the longest cumulative duration
+		var criticalPathInput *node
+		for _, input := range result.Action.Inputs {
+			if x := cp.nodes[input]; x != nil {
+				if criticalPathInput == nil || x.cumulativeDuration > criticalPathInput.cumulativeDuration {
+					criticalPathInput = x
+				}
+			}
+		}
+
+		end := cp.clock.Now()
+		duration := end.Sub(start)
+
+		cumulativeDuration := duration
+		if criticalPathInput != nil {
+			cumulativeDuration += criticalPathInput.cumulativeDuration
+		}
+
+		node := &node{
+			action:             result.Action,
+			cumulativeDuration: cumulativeDuration,
+			duration:           duration,
+			input:              criticalPathInput,
+		}
+
+		for _, output := range result.Action.Outputs {
+			cp.nodes[output] = node
+		}
+
+		cp.end = end
+	}
+}
+
+func (cp *criticalPath) Flush() {
+	criticalPath := cp.criticalPath()
+
+	if len(criticalPath) > 0 {
+		// Log the critical path to the verbose log
+		criticalTime := criticalPath[0].cumulativeDuration.Round(time.Second)
+		cp.log.Verbosef("critical path took %s", criticalTime.String())
+		if !cp.start.IsZero() {
+			elapsedTime := cp.end.Sub(cp.start).Round(time.Second)
+			cp.log.Verbosef("elapsed time %s", elapsedTime.String())
+			cp.log.Verbosef("perfect parallelism ratio %d%%",
+				int(float64(criticalTime)/float64(elapsedTime)*100))
+		}
+		cp.log.Verbose("critical path:")
+		for i := len(criticalPath) - 1; i >= 0; i-- {
+			duration := criticalPath[i].duration
+			duration = duration.Round(time.Second)
+			seconds := int(duration.Seconds())
+			cp.log.Verbosef("   %2d:%02d %s",
+				seconds/60, seconds%60, criticalPath[i].action.Description)
+		}
+	}
+}
+
+func (cp *criticalPath) Message(level MsgLevel, msg string) {}
+
+func (cp *criticalPath) Write(p []byte) (n int, err error) { return len(p), nil }
+
+func (cp *criticalPath) criticalPath() []*node {
+	var max *node
+
+	// Find the node with the longest critical path
+	for _, node := range cp.nodes {
+		if max == nil || node.cumulativeDuration > max.cumulativeDuration {
+			max = node
+		}
+	}
+
+	// Follow the critical path back to the leaf node
+	var criticalPath []*node
+	node := max
+	for node != nil {
+		criticalPath = append(criticalPath, node)
+		node = node.input
+	}
+
+	return criticalPath
+}
diff --git a/ui/status/critical_path_test.go b/ui/status/critical_path_test.go
new file mode 100644
index 0000000..965e0ad
--- /dev/null
+++ b/ui/status/critical_path_test.go
@@ -0,0 +1,166 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package status
+
+import (
+	"reflect"
+	"testing"
+	"time"
+)
+
+type testCriticalPath struct {
+	*criticalPath
+	Counts
+
+	actions map[int]*Action
+}
+
+type testClock time.Time
+
+func (t testClock) Now() time.Time { return time.Time(t) }
+
+func (t *testCriticalPath) start(id int, startTime time.Duration, outputs, inputs []string) {
+	t.clock = testClock(time.Unix(0, 0).Add(startTime))
+	action := &Action{
+		Description: outputs[0],
+		Outputs:     outputs,
+		Inputs:      inputs,
+	}
+
+	t.actions[id] = action
+	t.StartAction(action, t.Counts)
+}
+
+func (t *testCriticalPath) finish(id int, endTime time.Duration) {
+	t.clock = testClock(time.Unix(0, 0).Add(endTime))
+	t.FinishAction(ActionResult{
+		Action: t.actions[id],
+	}, t.Counts)
+}
+
+func TestCriticalPath(t *testing.T) {
+	tests := []struct {
+		name     string
+		msgs     func(*testCriticalPath)
+		want     []string
+		wantTime time.Duration
+	}{
+		{
+			name: "empty",
+			msgs: func(cp *testCriticalPath) {},
+		},
+		{
+			name: "duplicate",
+			msgs: func(cp *testCriticalPath) {
+				cp.start(0, 0, []string{"a"}, nil)
+				cp.start(1, 0, []string{"a"}, nil)
+				cp.finish(0, 1000)
+				cp.finish(0, 2000)
+			},
+			want:     []string{"a"},
+			wantTime: 1000,
+		},
+		{
+			name: "linear",
+			//  a
+			//  |
+			//  b
+			//  |
+			//  c
+			msgs: func(cp *testCriticalPath) {
+				cp.start(0, 0, []string{"a"}, nil)
+				cp.finish(0, 1000)
+				cp.start(1, 1000, []string{"b"}, []string{"a"})
+				cp.finish(1, 2000)
+				cp.start(2, 3000, []string{"c"}, []string{"b"})
+				cp.finish(2, 4000)
+			},
+			want:     []string{"c", "b", "a"},
+			wantTime: 3000,
+		},
+		{
+			name: "diamond",
+			//  a
+			//  |\
+			//  b c
+			//  |/
+			//  d
+			msgs: func(cp *testCriticalPath) {
+				cp.start(0, 0, []string{"a"}, nil)
+				cp.finish(0, 1000)
+				cp.start(1, 1000, []string{"b"}, []string{"a"})
+				cp.start(2, 1000, []string{"c"}, []string{"a"})
+				cp.finish(1, 2000)
+				cp.finish(2, 3000)
+				cp.start(3, 3000, []string{"d"}, []string{"b", "c"})
+				cp.finish(3, 4000)
+			},
+			want:     []string{"d", "c", "a"},
+			wantTime: 4000,
+		},
+		{
+			name: "multiple",
+			//  a d
+			//  | |
+			//  b e
+			//  |
+			//  c
+			msgs: func(cp *testCriticalPath) {
+				cp.start(0, 0, []string{"a"}, nil)
+				cp.start(3, 0, []string{"d"}, nil)
+				cp.finish(0, 1000)
+				cp.finish(3, 1000)
+				cp.start(1, 1000, []string{"b"}, []string{"a"})
+				cp.start(4, 1000, []string{"e"}, []string{"d"})
+				cp.finish(1, 2000)
+				cp.start(2, 2000, []string{"c"}, []string{"b"})
+				cp.finish(2, 3000)
+				cp.finish(4, 4000)
+
+			},
+			want:     []string{"e", "d"},
+			wantTime: 4000,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cp := &testCriticalPath{
+				criticalPath: NewCriticalPath(nil).(*criticalPath),
+				actions:      make(map[int]*Action),
+			}
+
+			tt.msgs(cp)
+
+			criticalPath := cp.criticalPath.criticalPath()
+
+			var descs []string
+			for _, x := range criticalPath {
+				descs = append(descs, x.action.Description)
+			}
+
+			if !reflect.DeepEqual(descs, tt.want) {
+				t.Errorf("criticalPath.criticalPath() = %v, want %v", descs, tt.want)
+			}
+
+			var gotTime time.Duration
+			if len(criticalPath) > 0 {
+				gotTime = criticalPath[0].cumulativeDuration
+			}
+			if gotTime != tt.wantTime {
+				t.Errorf("cumulativeDuration[0].cumulativeDuration = %v, want %v", gotTime, tt.wantTime)
+			}
+		})
+	}
+}
diff --git a/ui/status/log.go b/ui/status/log.go
index 921aa44..9090f49 100644
--- a/ui/status/log.go
+++ b/ui/status/log.go
@@ -15,11 +15,17 @@
 package status
 
 import (
-	"android/soong/ui/logger"
 	"compress/gzip"
+	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"strings"
+
+	"github.com/golang/protobuf/proto"
+
+	"android/soong/ui/logger"
+	"android/soong/ui/status/build_error_proto"
 )
 
 type verboseLog struct {
@@ -71,9 +77,13 @@
 	fmt.Fprintf(v.w, "%s%s\n", level.Prefix(), message)
 }
 
-type errorLog struct {
-	w io.WriteCloser
+func (v *verboseLog) Write(p []byte) (int, error) {
+	fmt.Fprint(v.w, string(p))
+	return len(p), nil
+}
 
+type errorLog struct {
+	w     io.WriteCloser
 	empty bool
 }
 
@@ -97,20 +107,17 @@
 		return
 	}
 
-	cmd := result.Command
-	if cmd == "" {
-		cmd = result.Description
-	}
-
 	if !e.empty {
 		fmt.Fprintf(e.w, "\n\n")
 	}
 	e.empty = false
 
 	fmt.Fprintf(e.w, "FAILED: %s\n", result.Description)
+
 	if len(result.Outputs) > 0 {
 		fmt.Fprintf(e.w, "Outputs: %s\n", strings.Join(result.Outputs, " "))
 	}
+
 	fmt.Fprintf(e.w, "Error: %s\n", result.Error)
 	if result.Command != "" {
 		fmt.Fprintf(e.w, "Command: %s\n", result.Command)
@@ -134,3 +141,60 @@
 
 	fmt.Fprintf(e.w, "error: %s\n", message)
 }
+
+func (e *errorLog) Write(p []byte) (int, error) {
+	fmt.Fprint(e.w, string(p))
+	return len(p), nil
+}
+
+type errorProtoLog struct {
+	errorProto soong_build_error_proto.BuildError
+	filename   string
+	log        logger.Logger
+}
+
+func NewProtoErrorLog(log logger.Logger, filename string) StatusOutput {
+	return &errorProtoLog{
+		errorProto: soong_build_error_proto.BuildError{},
+		filename:   filename,
+		log:        log,
+	}
+}
+
+func (e *errorProtoLog) StartAction(action *Action, counts Counts) {}
+
+func (e *errorProtoLog) FinishAction(result ActionResult, counts Counts) {
+	if result.Error == nil {
+		return
+	}
+
+	e.errorProto.ActionErrors = append(e.errorProto.ActionErrors, &soong_build_error_proto.BuildActionError{
+		Description: proto.String(result.Description),
+		Command:     proto.String(result.Command),
+		Output:      proto.String(result.Output),
+		Artifacts:   result.Outputs,
+		Error:       proto.String(result.Error.Error()),
+	})
+}
+
+func (e *errorProtoLog) Flush() {
+	data, err := proto.Marshal(&e.errorProto)
+	if err != nil {
+		e.log.Println("Failed to marshal build status proto: %v", err)
+		return
+	}
+	err = ioutil.WriteFile(e.filename, []byte(data), 0644)
+	if err != nil {
+		e.log.Println("Failed to write file %s: %v", e.errorProto, err)
+	}
+}
+
+func (e *errorProtoLog) Message(level MsgLevel, message string) {
+	if level > ErrorLvl {
+		e.errorProto.ErrorMessages = append(e.errorProto.ErrorMessages, message)
+	}
+}
+
+func (e *errorProtoLog) Write(p []byte) (int, error) {
+	return 0, errors.New("not supported")
+}
diff --git a/ui/status/ninja.go b/ui/status/ninja.go
index ee2a2da..9cf2f6a 100644
--- a/ui/status/ninja.go
+++ b/ui/status/ninja.go
@@ -142,6 +142,7 @@
 			action := &Action{
 				Description: msg.EdgeStarted.GetDesc(),
 				Outputs:     msg.EdgeStarted.Outputs,
+				Inputs:      msg.EdgeStarted.Inputs,
 				Command:     msg.EdgeStarted.GetCommand(),
 			}
 			n.status.StartAction(action)
diff --git a/ui/status/status.go b/ui/status/status.go
index 46ec72e..df33baa 100644
--- a/ui/status/status.go
+++ b/ui/status/status.go
@@ -32,6 +32,10 @@
 	// but they can be any string.
 	Outputs []string
 
+	// Inputs is the (optional) list of inputs. Usually these are files,
+	// but they can be any string.
+	Inputs []string
+
 	// Command is the actual command line executed to perform the action.
 	// It's optional, but one of either Description or Command should be
 	// set.
@@ -173,6 +177,9 @@
 	// Flush is called when your outputs should be flushed / closed. No
 	// output is expected after this call.
 	Flush()
+
+	// Write lets StatusOutput implement io.Writer
+	Write(p []byte) (n int, err error)
 }
 
 // Status is the multiplexer / accumulator between ToolStatus instances (via
diff --git a/ui/status/status_test.go b/ui/status/status_test.go
index e62785f..9494582 100644
--- a/ui/status/status_test.go
+++ b/ui/status/status_test.go
@@ -27,6 +27,11 @@
 func (c counterOutput) Message(level MsgLevel, msg string) {}
 func (c counterOutput) Flush()                             {}
 
+func (c counterOutput) Write(p []byte) (int, error) {
+	// Discard writes
+	return len(p), nil
+}
+
 func (c counterOutput) Expect(t *testing.T, counts Counts) {
 	if Counts(c) == counts {
 		return
diff --git a/ui/terminal/Android.bp b/ui/terminal/Android.bp
index 7104a50..b533b0d 100644
--- a/ui/terminal/Android.bp
+++ b/ui/terminal/Android.bp
@@ -17,11 +17,15 @@
     pkgPath: "android/soong/ui/terminal",
     deps: ["soong-ui-status"],
     srcs: [
+        "dumb_status.go",
+        "format.go",
+        "smart_status.go",
         "status.go",
-        "writer.go",
+        "stdio.go",
         "util.go",
     ],
     testSrcs: [
+        "status_test.go",
         "util_test.go",
     ],
     darwin: {
diff --git a/ui/terminal/dumb_status.go b/ui/terminal/dumb_status.go
new file mode 100644
index 0000000..201770f
--- /dev/null
+++ b/ui/terminal/dumb_status.go
@@ -0,0 +1,71 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package terminal
+
+import (
+	"fmt"
+	"io"
+
+	"android/soong/ui/status"
+)
+
+type dumbStatusOutput struct {
+	writer    io.Writer
+	formatter formatter
+}
+
+// NewDumbStatusOutput returns a StatusOutput that represents the
+// current build status similarly to Ninja's built-in terminal
+// output.
+func NewDumbStatusOutput(w io.Writer, formatter formatter) status.StatusOutput {
+	return &dumbStatusOutput{
+		writer:    w,
+		formatter: formatter,
+	}
+}
+
+func (s *dumbStatusOutput) Message(level status.MsgLevel, message string) {
+	if level >= status.StatusLvl {
+		fmt.Fprintln(s.writer, s.formatter.message(level, message))
+	}
+}
+
+func (s *dumbStatusOutput) StartAction(action *status.Action, counts status.Counts) {
+}
+
+func (s *dumbStatusOutput) FinishAction(result status.ActionResult, counts status.Counts) {
+	str := result.Description
+	if str == "" {
+		str = result.Command
+	}
+
+	progress := s.formatter.progress(counts) + str
+
+	output := s.formatter.result(result)
+	output = string(stripAnsiEscapes([]byte(output)))
+
+	if output != "" {
+		fmt.Fprint(s.writer, progress, "\n", output)
+	} else {
+		fmt.Fprintln(s.writer, progress)
+	}
+}
+
+func (s *dumbStatusOutput) Flush() {}
+
+func (s *dumbStatusOutput) Write(p []byte) (int, error) {
+	fmt.Fprint(s.writer, string(p))
+	return len(p), nil
+}
diff --git a/ui/terminal/format.go b/ui/terminal/format.go
new file mode 100644
index 0000000..4205bdc
--- /dev/null
+++ b/ui/terminal/format.go
@@ -0,0 +1,123 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package terminal
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"android/soong/ui/status"
+)
+
+type formatter struct {
+	format string
+	quiet  bool
+	start  time.Time
+}
+
+// newFormatter returns a formatter for formatting output to
+// the terminal in a format similar to Ninja.
+// format takes nearly all the same options as NINJA_STATUS.
+// %c is currently unsupported.
+func newFormatter(format string, quiet bool) formatter {
+	return formatter{
+		format: format,
+		quiet:  quiet,
+		start:  time.Now(),
+	}
+}
+
+func (s formatter) message(level status.MsgLevel, message string) string {
+	if level >= status.ErrorLvl {
+		return fmt.Sprintf("FAILED: %s", message)
+	} else if level > status.StatusLvl {
+		return fmt.Sprintf("%s%s", level.Prefix(), message)
+	} else if level == status.StatusLvl {
+		return message
+	}
+	return ""
+}
+
+func (s formatter) progress(counts status.Counts) string {
+	if s.format == "" {
+		return fmt.Sprintf("[%3d%% %d/%d] ", 100*counts.FinishedActions/counts.TotalActions, counts.FinishedActions, counts.TotalActions)
+	}
+
+	buf := &strings.Builder{}
+	for i := 0; i < len(s.format); i++ {
+		c := s.format[i]
+		if c != '%' {
+			buf.WriteByte(c)
+			continue
+		}
+
+		i = i + 1
+		if i == len(s.format) {
+			buf.WriteByte(c)
+			break
+		}
+
+		c = s.format[i]
+		switch c {
+		case '%':
+			buf.WriteByte(c)
+		case 's':
+			fmt.Fprintf(buf, "%d", counts.StartedActions)
+		case 't':
+			fmt.Fprintf(buf, "%d", counts.TotalActions)
+		case 'r':
+			fmt.Fprintf(buf, "%d", counts.RunningActions)
+		case 'u':
+			fmt.Fprintf(buf, "%d", counts.TotalActions-counts.StartedActions)
+		case 'f':
+			fmt.Fprintf(buf, "%d", counts.FinishedActions)
+		case 'o':
+			fmt.Fprintf(buf, "%.1f", float64(counts.FinishedActions)/time.Since(s.start).Seconds())
+		case 'c':
+			// TODO: implement?
+			buf.WriteRune('?')
+		case 'p':
+			fmt.Fprintf(buf, "%3d%%", 100*counts.FinishedActions/counts.TotalActions)
+		case 'e':
+			fmt.Fprintf(buf, "%.3f", time.Since(s.start).Seconds())
+		default:
+			buf.WriteString("unknown placeholder '")
+			buf.WriteByte(c)
+			buf.WriteString("'")
+		}
+	}
+	return buf.String()
+}
+
+func (s formatter) result(result status.ActionResult) string {
+	var ret string
+	if result.Error != nil {
+		targets := strings.Join(result.Outputs, " ")
+		if s.quiet || result.Command == "" {
+			ret = fmt.Sprintf("FAILED: %s\n%s", targets, result.Output)
+		} else {
+			ret = fmt.Sprintf("FAILED: %s\n%s\n%s", targets, result.Command, result.Output)
+		}
+	} else if result.Output != "" {
+		ret = result.Output
+	}
+
+	if len(ret) > 0 && ret[len(ret)-1] != '\n' {
+		ret += "\n"
+	}
+
+	return ret
+}
diff --git a/ui/terminal/smart_status.go b/ui/terminal/smart_status.go
new file mode 100644
index 0000000..8659d4d
--- /dev/null
+++ b/ui/terminal/smart_status.go
@@ -0,0 +1,427 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package terminal
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"os/signal"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	"android/soong/ui/status"
+)
+
+const tableHeightEnVar = "SOONG_UI_TABLE_HEIGHT"
+
+type actionTableEntry struct {
+	action    *status.Action
+	startTime time.Time
+}
+
+type smartStatusOutput struct {
+	writer    io.Writer
+	formatter formatter
+
+	lock sync.Mutex
+
+	haveBlankLine bool
+
+	tableMode             bool
+	tableHeight           int
+	requestedTableHeight  int
+	termWidth, termHeight int
+
+	runningActions  []actionTableEntry
+	ticker          *time.Ticker
+	done            chan bool
+	sigwinch        chan os.Signal
+	sigwinchHandled chan bool
+}
+
+// NewSmartStatusOutput returns a StatusOutput that represents the
+// current build status similarly to Ninja's built-in terminal
+// output.
+func NewSmartStatusOutput(w io.Writer, formatter formatter) status.StatusOutput {
+	tableHeight, _ := strconv.Atoi(os.Getenv(tableHeightEnVar))
+
+	s := &smartStatusOutput{
+		writer:    w,
+		formatter: formatter,
+
+		haveBlankLine: true,
+
+		tableMode:            tableHeight > 0,
+		requestedTableHeight: tableHeight,
+
+		done:     make(chan bool),
+		sigwinch: make(chan os.Signal),
+	}
+
+	s.updateTermSize()
+
+	if s.tableMode {
+		// Add empty lines at the bottom of the screen to scroll back the existing history
+		// and make room for the action table.
+		// TODO: read the cursor position to see if the empty lines are necessary?
+		for i := 0; i < s.tableHeight; i++ {
+			fmt.Fprintln(w)
+		}
+
+		// Hide the cursor to prevent seeing it bouncing around
+		fmt.Fprintf(s.writer, ansi.hideCursor())
+
+		// Configure the empty action table
+		s.actionTable()
+
+		// Start a tick to update the action table periodically
+		s.startActionTableTick()
+	}
+
+	s.startSigwinch()
+
+	return s
+}
+
+func (s *smartStatusOutput) Message(level status.MsgLevel, message string) {
+	if level < status.StatusLvl {
+		return
+	}
+
+	str := s.formatter.message(level, message)
+
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	if level > status.StatusLvl {
+		s.print(str)
+	} else {
+		s.statusLine(str)
+	}
+}
+
+func (s *smartStatusOutput) StartAction(action *status.Action, counts status.Counts) {
+	startTime := time.Now()
+
+	str := action.Description
+	if str == "" {
+		str = action.Command
+	}
+
+	progress := s.formatter.progress(counts)
+
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.runningActions = append(s.runningActions, actionTableEntry{
+		action:    action,
+		startTime: startTime,
+	})
+
+	s.statusLine(progress + str)
+}
+
+func (s *smartStatusOutput) FinishAction(result status.ActionResult, counts status.Counts) {
+	str := result.Description
+	if str == "" {
+		str = result.Command
+	}
+
+	progress := s.formatter.progress(counts) + str
+
+	output := s.formatter.result(result)
+
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	for i, runningAction := range s.runningActions {
+		if runningAction.action == result.Action {
+			s.runningActions = append(s.runningActions[:i], s.runningActions[i+1:]...)
+			break
+		}
+	}
+
+	if output != "" {
+		s.statusLine(progress)
+		s.requestLine()
+		s.print(output)
+	} else {
+		s.statusLine(progress)
+	}
+}
+
+func (s *smartStatusOutput) Flush() {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+
+	s.stopSigwinch()
+
+	s.requestLine()
+
+	s.runningActions = nil
+
+	if s.tableMode {
+		s.stopActionTableTick()
+
+		// Update the table after clearing runningActions to clear it
+		s.actionTable()
+
+		// Reset the scrolling region to the whole terminal
+		fmt.Fprintf(s.writer, ansi.resetScrollingMargins())
+		_, height, _ := termSize(s.writer)
+		// Move the cursor to the top of the now-blank, previously non-scrolling region
+		fmt.Fprintf(s.writer, ansi.setCursor(height-s.tableHeight, 0))
+		// Turn the cursor back on
+		fmt.Fprintf(s.writer, ansi.showCursor())
+	}
+}
+
+func (s *smartStatusOutput) Write(p []byte) (int, error) {
+	s.lock.Lock()
+	defer s.lock.Unlock()
+	s.print(string(p))
+	return len(p), nil
+}
+
+func (s *smartStatusOutput) requestLine() {
+	if !s.haveBlankLine {
+		fmt.Fprintln(s.writer)
+		s.haveBlankLine = true
+	}
+}
+
+func (s *smartStatusOutput) print(str string) {
+	if !s.haveBlankLine {
+		fmt.Fprint(s.writer, "\r", ansi.clearToEndOfLine())
+		s.haveBlankLine = true
+	}
+	fmt.Fprint(s.writer, str)
+	if len(str) == 0 || str[len(str)-1] != '\n' {
+		fmt.Fprint(s.writer, "\n")
+	}
+}
+
+func (s *smartStatusOutput) statusLine(str string) {
+	idx := strings.IndexRune(str, '\n')
+	if idx != -1 {
+		str = str[0:idx]
+	}
+
+	// Limit line width to the terminal width, otherwise we'll wrap onto
+	// another line and we won't delete the previous line.
+	str = elide(str, s.termWidth)
+
+	// Move to the beginning on the line, turn on bold, print the output,
+	// turn off bold, then clear the rest of the line.
+	start := "\r" + ansi.bold()
+	end := ansi.regular() + ansi.clearToEndOfLine()
+	fmt.Fprint(s.writer, start, str, end)
+	s.haveBlankLine = false
+}
+
+func elide(str string, width int) string {
+	if width > 0 && len(str) > width {
+		// TODO: Just do a max. Ninja elides the middle, but that's
+		// more complicated and these lines aren't that important.
+		str = str[:width]
+	}
+
+	return str
+}
+
+func (s *smartStatusOutput) startActionTableTick() {
+	s.ticker = time.NewTicker(time.Second)
+	go func() {
+		for {
+			select {
+			case <-s.ticker.C:
+				s.lock.Lock()
+				s.actionTable()
+				s.lock.Unlock()
+			case <-s.done:
+				return
+			}
+		}
+	}()
+}
+
+func (s *smartStatusOutput) stopActionTableTick() {
+	s.ticker.Stop()
+	s.done <- true
+}
+
+func (s *smartStatusOutput) startSigwinch() {
+	signal.Notify(s.sigwinch, syscall.SIGWINCH)
+	go func() {
+		for _ = range s.sigwinch {
+			s.lock.Lock()
+			s.updateTermSize()
+			if s.tableMode {
+				s.actionTable()
+			}
+			s.lock.Unlock()
+			if s.sigwinchHandled != nil {
+				s.sigwinchHandled <- true
+			}
+		}
+	}()
+}
+
+func (s *smartStatusOutput) stopSigwinch() {
+	signal.Stop(s.sigwinch)
+	close(s.sigwinch)
+}
+
+func (s *smartStatusOutput) updateTermSize() {
+	if w, h, ok := termSize(s.writer); ok {
+		firstUpdate := s.termHeight == 0 && s.termWidth == 0
+		oldScrollingHeight := s.termHeight - s.tableHeight
+
+		s.termWidth, s.termHeight = w, h
+
+		if s.tableMode {
+			tableHeight := s.requestedTableHeight
+			if tableHeight > s.termHeight-1 {
+				tableHeight = s.termHeight - 1
+			}
+			s.tableHeight = tableHeight
+
+			scrollingHeight := s.termHeight - s.tableHeight
+
+			if !firstUpdate {
+				// If the scrolling region has changed, attempt to pan the existing text so that it is
+				// not overwritten by the table.
+				if scrollingHeight < oldScrollingHeight {
+					pan := oldScrollingHeight - scrollingHeight
+					if pan > s.tableHeight {
+						pan = s.tableHeight
+					}
+					fmt.Fprint(s.writer, ansi.panDown(pan))
+				}
+			}
+		}
+	}
+}
+
+func (s *smartStatusOutput) actionTable() {
+	scrollingHeight := s.termHeight - s.tableHeight
+
+	// Update the scrolling region in case the height of the terminal changed
+	fmt.Fprint(s.writer, ansi.setScrollingMargins(0, scrollingHeight))
+	// Move the cursor to the first line of the non-scrolling region
+	fmt.Fprint(s.writer, ansi.setCursor(scrollingHeight+1, 0))
+
+	// Write as many status lines as fit in the table
+	var tableLine int
+	var runningAction actionTableEntry
+	for tableLine, runningAction = range s.runningActions {
+		if tableLine >= s.tableHeight {
+			break
+		}
+
+		seconds := int(time.Since(runningAction.startTime).Round(time.Second).Seconds())
+
+		desc := runningAction.action.Description
+		if desc == "" {
+			desc = runningAction.action.Command
+		}
+
+		color := ""
+		if seconds >= 60 {
+			color = ansi.red() + ansi.bold()
+		} else if seconds >= 30 {
+			color = ansi.yellow() + ansi.bold()
+		}
+
+		durationStr := fmt.Sprintf("   %2d:%02d ", seconds/60, seconds%60)
+		desc = elide(desc, s.termWidth-len(durationStr))
+		durationStr = color + durationStr + ansi.regular()
+
+		fmt.Fprint(s.writer, durationStr, desc, ansi.clearToEndOfLine())
+		if tableLine < s.tableHeight-1 {
+			fmt.Fprint(s.writer, "\n")
+		}
+	}
+
+	// Clear any remaining lines in the table
+	for ; tableLine < s.tableHeight; tableLine++ {
+		fmt.Fprint(s.writer, ansi.clearToEndOfLine())
+		if tableLine < s.tableHeight-1 {
+			fmt.Fprint(s.writer, "\n")
+		}
+	}
+
+	// Move the cursor back to the last line of the scrolling region
+	fmt.Fprint(s.writer, ansi.setCursor(scrollingHeight, 0))
+}
+
+var ansi = ansiImpl{}
+
+type ansiImpl struct{}
+
+func (ansiImpl) clearToEndOfLine() string {
+	return "\x1b[K"
+}
+
+func (ansiImpl) setCursor(row, column int) string {
+	// Direct cursor address
+	return fmt.Sprintf("\x1b[%d;%dH", row, column)
+}
+
+func (ansiImpl) setScrollingMargins(top, bottom int) string {
+	// Set Top and Bottom Margins DECSTBM
+	return fmt.Sprintf("\x1b[%d;%dr", top, bottom)
+}
+
+func (ansiImpl) resetScrollingMargins() string {
+	// Set Top and Bottom Margins DECSTBM
+	return fmt.Sprintf("\x1b[r")
+}
+
+func (ansiImpl) red() string {
+	return "\x1b[31m"
+}
+
+func (ansiImpl) yellow() string {
+	return "\x1b[33m"
+}
+
+func (ansiImpl) bold() string {
+	return "\x1b[1m"
+}
+
+func (ansiImpl) regular() string {
+	return "\x1b[0m"
+}
+
+func (ansiImpl) showCursor() string {
+	return "\x1b[?25h"
+}
+
+func (ansiImpl) hideCursor() string {
+	return "\x1b[?25l"
+}
+
+func (ansiImpl) panDown(lines int) string {
+	return fmt.Sprintf("\x1b[%dS", lines)
+}
+
+func (ansiImpl) panUp(lines int) string {
+	return fmt.Sprintf("\x1b[%dT", lines)
+}
diff --git a/ui/terminal/status.go b/ui/terminal/status.go
index 2445c5b..69a2a09 100644
--- a/ui/terminal/status.go
+++ b/ui/terminal/status.go
@@ -15,131 +15,23 @@
 package terminal
 
 import (
-	"fmt"
-	"strings"
-	"time"
+	"io"
 
 	"android/soong/ui/status"
 )
 
-type statusOutput struct {
-	writer Writer
-	format string
-
-	start time.Time
-	quiet bool
-}
-
 // NewStatusOutput returns a StatusOutput that represents the
 // current build status similarly to Ninja's built-in terminal
 // output.
 //
 // statusFormat takes nearly all the same options as NINJA_STATUS.
 // %c is currently unsupported.
-func NewStatusOutput(w Writer, statusFormat string, quietBuild bool) status.StatusOutput {
-	return &statusOutput{
-		writer: w,
-		format: statusFormat,
+func NewStatusOutput(w io.Writer, statusFormat string, quietBuild bool) status.StatusOutput {
+	formatter := newFormatter(statusFormat, quietBuild)
 
-		start: time.Now(),
-		quiet: quietBuild,
-	}
-}
-
-func (s *statusOutput) Message(level status.MsgLevel, message string) {
-	if level >= status.ErrorLvl {
-		s.writer.Print(fmt.Sprintf("FAILED: %s", message))
-	} else if level > status.StatusLvl {
-		s.writer.Print(fmt.Sprintf("%s%s", level.Prefix(), message))
-	} else if level == status.StatusLvl {
-		s.writer.StatusLine(message)
-	}
-}
-
-func (s *statusOutput) StartAction(action *status.Action, counts status.Counts) {
-	if !s.writer.isSmartTerminal() {
-		return
-	}
-
-	str := action.Description
-	if str == "" {
-		str = action.Command
-	}
-
-	s.writer.StatusLine(s.progress(counts) + str)
-}
-
-func (s *statusOutput) FinishAction(result status.ActionResult, counts status.Counts) {
-	str := result.Description
-	if str == "" {
-		str = result.Command
-	}
-
-	progress := s.progress(counts) + str
-
-	if result.Error != nil {
-		targets := strings.Join(result.Outputs, " ")
-		if s.quiet || result.Command == "" {
-			s.writer.StatusAndMessage(progress, fmt.Sprintf("FAILED: %s\n%s", targets, result.Output))
-		} else {
-			s.writer.StatusAndMessage(progress, fmt.Sprintf("FAILED: %s\n%s\n%s", targets, result.Command, result.Output))
-		}
-	} else if result.Output != "" {
-		s.writer.StatusAndMessage(progress, result.Output)
+	if isSmartTerminal(w) {
+		return NewSmartStatusOutput(w, formatter)
 	} else {
-		s.writer.StatusLine(progress)
+		return NewDumbStatusOutput(w, formatter)
 	}
 }
-
-func (s *statusOutput) Flush() {}
-
-func (s *statusOutput) progress(counts status.Counts) string {
-	if s.format == "" {
-		return fmt.Sprintf("[%3d%% %d/%d] ", 100*counts.FinishedActions/counts.TotalActions, counts.FinishedActions, counts.TotalActions)
-	}
-
-	buf := &strings.Builder{}
-	for i := 0; i < len(s.format); i++ {
-		c := s.format[i]
-		if c != '%' {
-			buf.WriteByte(c)
-			continue
-		}
-
-		i = i + 1
-		if i == len(s.format) {
-			buf.WriteByte(c)
-			break
-		}
-
-		c = s.format[i]
-		switch c {
-		case '%':
-			buf.WriteByte(c)
-		case 's':
-			fmt.Fprintf(buf, "%d", counts.StartedActions)
-		case 't':
-			fmt.Fprintf(buf, "%d", counts.TotalActions)
-		case 'r':
-			fmt.Fprintf(buf, "%d", counts.RunningActions)
-		case 'u':
-			fmt.Fprintf(buf, "%d", counts.TotalActions-counts.StartedActions)
-		case 'f':
-			fmt.Fprintf(buf, "%d", counts.FinishedActions)
-		case 'o':
-			fmt.Fprintf(buf, "%.1f", float64(counts.FinishedActions)/time.Since(s.start).Seconds())
-		case 'c':
-			// TODO: implement?
-			buf.WriteRune('?')
-		case 'p':
-			fmt.Fprintf(buf, "%3d%%", 100*counts.FinishedActions/counts.TotalActions)
-		case 'e':
-			fmt.Fprintf(buf, "%.3f", time.Since(s.start).Seconds())
-		default:
-			buf.WriteString("unknown placeholder '")
-			buf.WriteByte(c)
-			buf.WriteString("'")
-		}
-	}
-	return buf.String()
-}
diff --git a/ui/terminal/status_test.go b/ui/terminal/status_test.go
new file mode 100644
index 0000000..81aa238
--- /dev/null
+++ b/ui/terminal/status_test.go
@@ -0,0 +1,284 @@
+// Copyright 2018 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package terminal
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"syscall"
+	"testing"
+
+	"android/soong/ui/status"
+)
+
+func TestStatusOutput(t *testing.T) {
+	tests := []struct {
+		name  string
+		calls func(stat status.StatusOutput)
+		smart string
+		dumb  string
+	}{
+		{
+			name:  "two actions",
+			calls: twoActions,
+			smart: "\r\x1b[1m[  0% 0/2] action1\x1b[0m\x1b[K\r\x1b[1m[ 50% 1/2] action1\x1b[0m\x1b[K\r\x1b[1m[ 50% 1/2] action2\x1b[0m\x1b[K\r\x1b[1m[100% 2/2] action2\x1b[0m\x1b[K\n",
+			dumb:  "[ 50% 1/2] action1\n[100% 2/2] action2\n",
+		},
+		{
+			name:  "two parallel actions",
+			calls: twoParallelActions,
+			smart: "\r\x1b[1m[  0% 0/2] action1\x1b[0m\x1b[K\r\x1b[1m[  0% 0/2] action2\x1b[0m\x1b[K\r\x1b[1m[ 50% 1/2] action1\x1b[0m\x1b[K\r\x1b[1m[100% 2/2] action2\x1b[0m\x1b[K\n",
+			dumb:  "[ 50% 1/2] action1\n[100% 2/2] action2\n",
+		},
+		{
+			name:  "action with output",
+			calls: actionsWithOutput,
+			smart: "\r\x1b[1m[  0% 0/3] action1\x1b[0m\x1b[K\r\x1b[1m[ 33% 1/3] action1\x1b[0m\x1b[K\r\x1b[1m[ 33% 1/3] action2\x1b[0m\x1b[K\r\x1b[1m[ 66% 2/3] action2\x1b[0m\x1b[K\noutput1\noutput2\n\r\x1b[1m[ 66% 2/3] action3\x1b[0m\x1b[K\r\x1b[1m[100% 3/3] action3\x1b[0m\x1b[K\n",
+			dumb:  "[ 33% 1/3] action1\n[ 66% 2/3] action2\noutput1\noutput2\n[100% 3/3] action3\n",
+		},
+		{
+			name:  "action with output without newline",
+			calls: actionsWithOutputWithoutNewline,
+			smart: "\r\x1b[1m[  0% 0/3] action1\x1b[0m\x1b[K\r\x1b[1m[ 33% 1/3] action1\x1b[0m\x1b[K\r\x1b[1m[ 33% 1/3] action2\x1b[0m\x1b[K\r\x1b[1m[ 66% 2/3] action2\x1b[0m\x1b[K\noutput1\noutput2\n\r\x1b[1m[ 66% 2/3] action3\x1b[0m\x1b[K\r\x1b[1m[100% 3/3] action3\x1b[0m\x1b[K\n",
+			dumb:  "[ 33% 1/3] action1\n[ 66% 2/3] action2\noutput1\noutput2\n[100% 3/3] action3\n",
+		},
+		{
+			name:  "action with error",
+			calls: actionsWithError,
+			smart: "\r\x1b[1m[  0% 0/3] action1\x1b[0m\x1b[K\r\x1b[1m[ 33% 1/3] action1\x1b[0m\x1b[K\r\x1b[1m[ 33% 1/3] action2\x1b[0m\x1b[K\r\x1b[1m[ 66% 2/3] action2\x1b[0m\x1b[K\nFAILED: f1 f2\ntouch f1 f2\nerror1\nerror2\n\r\x1b[1m[ 66% 2/3] action3\x1b[0m\x1b[K\r\x1b[1m[100% 3/3] action3\x1b[0m\x1b[K\n",
+			dumb:  "[ 33% 1/3] action1\n[ 66% 2/3] action2\nFAILED: f1 f2\ntouch f1 f2\nerror1\nerror2\n[100% 3/3] action3\n",
+		},
+		{
+			name:  "action with empty description",
+			calls: actionWithEmptyDescription,
+			smart: "\r\x1b[1m[  0% 0/1] command1\x1b[0m\x1b[K\r\x1b[1m[100% 1/1] command1\x1b[0m\x1b[K\n",
+			dumb:  "[100% 1/1] command1\n",
+		},
+		{
+			name:  "messages",
+			calls: actionsWithMessages,
+			smart: "\r\x1b[1m[  0% 0/2] action1\x1b[0m\x1b[K\r\x1b[1m[ 50% 1/2] action1\x1b[0m\x1b[K\r\x1b[1mstatus\x1b[0m\x1b[K\r\x1b[Kprint\nFAILED: error\n\r\x1b[1m[ 50% 1/2] action2\x1b[0m\x1b[K\r\x1b[1m[100% 2/2] action2\x1b[0m\x1b[K\n",
+			dumb:  "[ 50% 1/2] action1\nstatus\nprint\nFAILED: error\n[100% 2/2] action2\n",
+		},
+		{
+			name:  "action with long description",
+			calls: actionWithLongDescription,
+			smart: "\r\x1b[1m[  0% 0/2] action with very long descrip\x1b[0m\x1b[K\r\x1b[1m[ 50% 1/2] action with very long descrip\x1b[0m\x1b[K\n",
+			dumb:  "[ 50% 1/2] action with very long description to test eliding\n",
+		},
+		{
+			name:  "action with output with ansi codes",
+			calls: actionWithOuptutWithAnsiCodes,
+			smart: "\r\x1b[1m[  0% 0/1] action1\x1b[0m\x1b[K\r\x1b[1m[100% 1/1] action1\x1b[0m\x1b[K\n\x1b[31mcolor\x1b[0m\n",
+			dumb:  "[100% 1/1] action1\ncolor\n",
+		},
+	}
+
+	os.Setenv(tableHeightEnVar, "")
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+
+			t.Run("smart", func(t *testing.T) {
+				smart := &fakeSmartTerminal{termWidth: 40}
+				stat := NewStatusOutput(smart, "", false)
+				tt.calls(stat)
+				stat.Flush()
+
+				if g, w := smart.String(), tt.smart; g != w {
+					t.Errorf("want:\n%q\ngot:\n%q", w, g)
+				}
+			})
+
+			t.Run("dumb", func(t *testing.T) {
+				dumb := &bytes.Buffer{}
+				stat := NewStatusOutput(dumb, "", false)
+				tt.calls(stat)
+				stat.Flush()
+
+				if g, w := dumb.String(), tt.dumb; g != w {
+					t.Errorf("want:\n%q\ngot:\n%q", w, g)
+				}
+			})
+		})
+	}
+}
+
+type runner struct {
+	counts status.Counts
+	stat   status.StatusOutput
+}
+
+func newRunner(stat status.StatusOutput, totalActions int) *runner {
+	return &runner{
+		counts: status.Counts{TotalActions: totalActions},
+		stat:   stat,
+	}
+}
+
+func (r *runner) startAction(action *status.Action) {
+	r.counts.StartedActions++
+	r.counts.RunningActions++
+	r.stat.StartAction(action, r.counts)
+}
+
+func (r *runner) finishAction(result status.ActionResult) {
+	r.counts.FinishedActions++
+	r.counts.RunningActions--
+	r.stat.FinishAction(result, r.counts)
+}
+
+func (r *runner) finishAndStartAction(result status.ActionResult, action *status.Action) {
+	r.counts.FinishedActions++
+	r.stat.FinishAction(result, r.counts)
+
+	r.counts.StartedActions++
+	r.stat.StartAction(action, r.counts)
+}
+
+var (
+	action1 = &status.Action{Description: "action1"}
+	result1 = status.ActionResult{Action: action1}
+	action2 = &status.Action{Description: "action2"}
+	result2 = status.ActionResult{Action: action2}
+	action3 = &status.Action{Description: "action3"}
+	result3 = status.ActionResult{Action: action3}
+)
+
+func twoActions(stat status.StatusOutput) {
+	runner := newRunner(stat, 2)
+	runner.startAction(action1)
+	runner.finishAction(result1)
+	runner.startAction(action2)
+	runner.finishAction(result2)
+}
+
+func twoParallelActions(stat status.StatusOutput) {
+	runner := newRunner(stat, 2)
+	runner.startAction(action1)
+	runner.startAction(action2)
+	runner.finishAction(result1)
+	runner.finishAction(result2)
+}
+
+func actionsWithOutput(stat status.StatusOutput) {
+	result2WithOutput := status.ActionResult{Action: action2, Output: "output1\noutput2\n"}
+
+	runner := newRunner(stat, 3)
+	runner.startAction(action1)
+	runner.finishAction(result1)
+	runner.startAction(action2)
+	runner.finishAction(result2WithOutput)
+	runner.startAction(action3)
+	runner.finishAction(result3)
+}
+
+func actionsWithOutputWithoutNewline(stat status.StatusOutput) {
+	result2WithOutputWithoutNewline := status.ActionResult{Action: action2, Output: "output1\noutput2"}
+
+	runner := newRunner(stat, 3)
+	runner.startAction(action1)
+	runner.finishAction(result1)
+	runner.startAction(action2)
+	runner.finishAction(result2WithOutputWithoutNewline)
+	runner.startAction(action3)
+	runner.finishAction(result3)
+}
+
+func actionsWithError(stat status.StatusOutput) {
+	action2WithError := &status.Action{Description: "action2", Outputs: []string{"f1", "f2"}, Command: "touch f1 f2"}
+	result2WithError := status.ActionResult{Action: action2WithError, Output: "error1\nerror2\n", Error: fmt.Errorf("error1")}
+
+	runner := newRunner(stat, 3)
+	runner.startAction(action1)
+	runner.finishAction(result1)
+	runner.startAction(action2WithError)
+	runner.finishAction(result2WithError)
+	runner.startAction(action3)
+	runner.finishAction(result3)
+}
+
+func actionWithEmptyDescription(stat status.StatusOutput) {
+	action1 := &status.Action{Command: "command1"}
+	result1 := status.ActionResult{Action: action1}
+
+	runner := newRunner(stat, 1)
+	runner.startAction(action1)
+	runner.finishAction(result1)
+}
+
+func actionsWithMessages(stat status.StatusOutput) {
+	runner := newRunner(stat, 2)
+
+	runner.startAction(action1)
+	runner.finishAction(result1)
+
+	stat.Message(status.VerboseLvl, "verbose")
+	stat.Message(status.StatusLvl, "status")
+	stat.Message(status.PrintLvl, "print")
+	stat.Message(status.ErrorLvl, "error")
+
+	runner.startAction(action2)
+	runner.finishAction(result2)
+}
+
+func actionWithLongDescription(stat status.StatusOutput) {
+	action1 := &status.Action{Description: "action with very long description to test eliding"}
+	result1 := status.ActionResult{Action: action1}
+
+	runner := newRunner(stat, 2)
+
+	runner.startAction(action1)
+
+	runner.finishAction(result1)
+}
+
+func actionWithOuptutWithAnsiCodes(stat status.StatusOutput) {
+	result1WithOutputWithAnsiCodes := status.ActionResult{Action: action1, Output: "\x1b[31mcolor\x1b[0m"}
+
+	runner := newRunner(stat, 1)
+	runner.startAction(action1)
+	runner.finishAction(result1WithOutputWithAnsiCodes)
+}
+
+func TestSmartStatusOutputWidthChange(t *testing.T) {
+	os.Setenv(tableHeightEnVar, "")
+
+	smart := &fakeSmartTerminal{termWidth: 40}
+	stat := NewStatusOutput(smart, "", false)
+	smartStat := stat.(*smartStatusOutput)
+	smartStat.sigwinchHandled = make(chan bool)
+
+	runner := newRunner(stat, 2)
+
+	action := &status.Action{Description: "action with very long description to test eliding"}
+	result := status.ActionResult{Action: action}
+
+	runner.startAction(action)
+	smart.termWidth = 30
+	// Fake a SIGWINCH
+	smartStat.sigwinch <- syscall.SIGWINCH
+	<-smartStat.sigwinchHandled
+	runner.finishAction(result)
+
+	stat.Flush()
+
+	w := "\r\x1b[1m[  0% 0/2] action with very long descrip\x1b[0m\x1b[K\r\x1b[1m[ 50% 1/2] action with very lo\x1b[0m\x1b[K\n"
+
+	if g := smart.String(); g != w {
+		t.Errorf("want:\n%q\ngot:\n%q", w, g)
+	}
+}
diff --git a/ui/terminal/stdio.go b/ui/terminal/stdio.go
new file mode 100644
index 0000000..dec2963
--- /dev/null
+++ b/ui/terminal/stdio.go
@@ -0,0 +1,55 @@
+// Copyright 2018 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package terminal provides a set of interfaces that can be used to interact
+// with the terminal (including falling back when the terminal is detected to
+// be a redirect or other dumb terminal)
+package terminal
+
+import (
+	"io"
+	"os"
+)
+
+// StdioInterface represents a set of stdin/stdout/stderr Reader/Writers
+type StdioInterface interface {
+	Stdin() io.Reader
+	Stdout() io.Writer
+	Stderr() io.Writer
+}
+
+// StdioImpl uses the OS stdin/stdout/stderr to implement StdioInterface
+type StdioImpl struct{}
+
+func (StdioImpl) Stdin() io.Reader  { return os.Stdin }
+func (StdioImpl) Stdout() io.Writer { return os.Stdout }
+func (StdioImpl) Stderr() io.Writer { return os.Stderr }
+
+var _ StdioInterface = StdioImpl{}
+
+type customStdio struct {
+	stdin  io.Reader
+	stdout io.Writer
+	stderr io.Writer
+}
+
+func NewCustomStdio(stdin io.Reader, stdout, stderr io.Writer) StdioInterface {
+	return customStdio{stdin, stdout, stderr}
+}
+
+func (c customStdio) Stdin() io.Reader  { return c.stdin }
+func (c customStdio) Stdout() io.Writer { return c.stdout }
+func (c customStdio) Stderr() io.Writer { return c.stderr }
+
+var _ StdioInterface = customStdio{}
diff --git a/ui/terminal/util.go b/ui/terminal/util.go
index a85a517..c9377f1 100644
--- a/ui/terminal/util.go
+++ b/ui/terminal/util.go
@@ -22,18 +22,20 @@
 	"unsafe"
 )
 
-func isTerminal(w io.Writer) bool {
+func isSmartTerminal(w io.Writer) bool {
 	if f, ok := w.(*os.File); ok {
 		var termios syscall.Termios
 		_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, f.Fd(),
 			ioctlGetTermios, uintptr(unsafe.Pointer(&termios)),
 			0, 0, 0)
 		return err == 0
+	} else if _, ok := w.(*fakeSmartTerminal); ok {
+		return true
 	}
 	return false
 }
 
-func termWidth(w io.Writer) (int, bool) {
+func termSize(w io.Writer) (width int, height int, ok bool) {
 	if f, ok := w.(*os.File); ok {
 		var winsize struct {
 			ws_row, ws_column    uint16
@@ -42,9 +44,11 @@
 		_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, f.Fd(),
 			syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(&winsize)),
 			0, 0, 0)
-		return int(winsize.ws_column), err == 0
+		return int(winsize.ws_column), int(winsize.ws_row), err == 0
+	} else if f, ok := w.(*fakeSmartTerminal); ok {
+		return f.termWidth, f.termHeight, true
 	}
-	return 0, false
+	return 0, 0, false
 }
 
 // stripAnsiEscapes strips ANSI control codes from a byte array in place.
@@ -99,3 +103,8 @@
 
 	return input
 }
+
+type fakeSmartTerminal struct {
+	bytes.Buffer
+	termWidth, termHeight int
+}
diff --git a/ui/terminal/writer.go b/ui/terminal/writer.go
deleted file mode 100644
index ebe4b2a..0000000
--- a/ui/terminal/writer.go
+++ /dev/null
@@ -1,229 +0,0 @@
-// Copyright 2018 Google Inc. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// Package terminal provides a set of interfaces that can be used to interact
-// with the terminal (including falling back when the terminal is detected to
-// be a redirect or other dumb terminal)
-package terminal
-
-import (
-	"fmt"
-	"io"
-	"os"
-	"strings"
-	"sync"
-)
-
-// Writer provides an interface to write temporary and permanent messages to
-// the terminal.
-//
-// The terminal is considered to be a dumb terminal if TERM==dumb, or if a
-// terminal isn't detected on stdout/stderr (generally because it's a pipe or
-// file). Dumb terminals will strip out all ANSI escape sequences, including
-// colors.
-type Writer interface {
-	// Print prints the string to the terminal, overwriting any current
-	// status being displayed.
-	//
-	// On a dumb terminal, the status messages will be kept.
-	Print(str string)
-
-	// Status prints the first line of the string to the terminal,
-	// overwriting any previous status line. Strings longer than the width
-	// of the terminal will be cut off.
-	//
-	// On a dumb terminal, previous status messages will remain, and the
-	// entire first line of the string will be printed.
-	StatusLine(str string)
-
-	// StatusAndMessage prints the first line of status to the terminal,
-	// similarly to StatusLine(), then prints the full msg below that. The
-	// status line is retained.
-	//
-	// There is guaranteed to be no other output in between the status and
-	// message.
-	StatusAndMessage(status, msg string)
-
-	// Finish ensures that the output ends with a newline (preserving any
-	// current status line that is current displayed).
-	//
-	// This does nothing on dumb terminals.
-	Finish()
-
-	// Write implements the io.Writer interface. This is primarily so that
-	// the logger can use this interface to print to stderr without
-	// breaking the other semantics of this interface.
-	//
-	// Try to use any of the other functions if possible.
-	Write(p []byte) (n int, err error)
-
-	isSmartTerminal() bool
-}
-
-// NewWriter creates a new Writer based on the stdio and the TERM
-// environment variable.
-func NewWriter(stdio StdioInterface) Writer {
-	w := &writerImpl{
-		stdio: stdio,
-
-		haveBlankLine: true,
-	}
-
-	if term, ok := os.LookupEnv("TERM"); ok && term != "dumb" {
-		w.smartTerminal = isTerminal(stdio.Stdout())
-	}
-	w.stripEscapes = !w.smartTerminal
-
-	return w
-}
-
-type writerImpl struct {
-	stdio StdioInterface
-
-	haveBlankLine bool
-
-	// Protecting the above, we assume that smartTerminal and stripEscapes
-	// does not change after initial setup.
-	lock sync.Mutex
-
-	smartTerminal bool
-	stripEscapes  bool
-}
-
-func (w *writerImpl) isSmartTerminal() bool {
-	return w.smartTerminal
-}
-
-func (w *writerImpl) requestLine() {
-	if !w.haveBlankLine {
-		fmt.Fprintln(w.stdio.Stdout())
-		w.haveBlankLine = true
-	}
-}
-
-func (w *writerImpl) Print(str string) {
-	if w.stripEscapes {
-		str = string(stripAnsiEscapes([]byte(str)))
-	}
-
-	w.lock.Lock()
-	defer w.lock.Unlock()
-	w.print(str)
-}
-
-func (w *writerImpl) print(str string) {
-	if !w.haveBlankLine {
-		fmt.Fprint(w.stdio.Stdout(), "\r", "\x1b[K")
-		w.haveBlankLine = true
-	}
-	fmt.Fprint(w.stdio.Stdout(), str)
-	if len(str) == 0 || str[len(str)-1] != '\n' {
-		fmt.Fprint(w.stdio.Stdout(), "\n")
-	}
-}
-
-func (w *writerImpl) StatusLine(str string) {
-	w.lock.Lock()
-	defer w.lock.Unlock()
-
-	w.statusLine(str)
-}
-
-func (w *writerImpl) statusLine(str string) {
-	if !w.smartTerminal {
-		fmt.Fprintln(w.stdio.Stdout(), str)
-		return
-	}
-
-	idx := strings.IndexRune(str, '\n')
-	if idx != -1 {
-		str = str[0:idx]
-	}
-
-	// Limit line width to the terminal width, otherwise we'll wrap onto
-	// another line and we won't delete the previous line.
-	//
-	// Run this on every line in case the window has been resized while
-	// we're printing. This could be optimized to only re-run when we get
-	// SIGWINCH if it ever becomes too time consuming.
-	if max, ok := termWidth(w.stdio.Stdout()); ok {
-		if len(str) > max {
-			// TODO: Just do a max. Ninja elides the middle, but that's
-			// more complicated and these lines aren't that important.
-			str = str[:max]
-		}
-	}
-
-	// Move to the beginning on the line, print the output, then clear
-	// the rest of the line.
-	fmt.Fprint(w.stdio.Stdout(), "\r", str, "\x1b[K")
-	w.haveBlankLine = false
-}
-
-func (w *writerImpl) StatusAndMessage(status, msg string) {
-	if w.stripEscapes {
-		msg = string(stripAnsiEscapes([]byte(msg)))
-	}
-
-	w.lock.Lock()
-	defer w.lock.Unlock()
-
-	w.statusLine(status)
-	w.requestLine()
-	w.print(msg)
-}
-
-func (w *writerImpl) Finish() {
-	w.lock.Lock()
-	defer w.lock.Unlock()
-
-	w.requestLine()
-}
-
-func (w *writerImpl) Write(p []byte) (n int, err error) {
-	w.Print(string(p))
-	return len(p), nil
-}
-
-// StdioInterface represents a set of stdin/stdout/stderr Reader/Writers
-type StdioInterface interface {
-	Stdin() io.Reader
-	Stdout() io.Writer
-	Stderr() io.Writer
-}
-
-// StdioImpl uses the OS stdin/stdout/stderr to implement StdioInterface
-type StdioImpl struct{}
-
-func (StdioImpl) Stdin() io.Reader  { return os.Stdin }
-func (StdioImpl) Stdout() io.Writer { return os.Stdout }
-func (StdioImpl) Stderr() io.Writer { return os.Stderr }
-
-var _ StdioInterface = StdioImpl{}
-
-type customStdio struct {
-	stdin  io.Reader
-	stdout io.Writer
-	stderr io.Writer
-}
-
-func NewCustomStdio(stdin io.Reader, stdout, stderr io.Writer) StdioInterface {
-	return customStdio{stdin, stdout, stderr}
-}
-
-func (c customStdio) Stdin() io.Reader  { return c.stdin }
-func (c customStdio) Stdout() io.Writer { return c.stdout }
-func (c customStdio) Stderr() io.Writer { return c.stderr }
-
-var _ StdioInterface = customStdio{}
diff --git a/ui/tracer/status.go b/ui/tracer/status.go
index af50e2d..c831255 100644
--- a/ui/tracer/status.go
+++ b/ui/tracer/status.go
@@ -85,3 +85,8 @@
 
 func (s *statusOutput) Flush()                                        {}
 func (s *statusOutput) Message(level status.MsgLevel, message string) {}
+
+func (s *statusOutput) Write(p []byte) (int, error) {
+	// Discard writes
+	return len(p), nil
+}
diff --git a/zip/cmd/main.go b/zip/cmd/main.go
index 6f40a3e..fba2e4b 100644
--- a/zip/cmd/main.go
+++ b/zip/cmd/main.go
@@ -136,6 +136,7 @@
 	writeIfChanged := flags.Bool("write_if_changed", false, "only update resultant .zip if it has changed")
 	ignoreMissingFiles := flags.Bool("ignore_missing_files", false, "continue if a requested file does not exist")
 	symlinks := flags.Bool("symlinks", true, "store symbolic links in zip instead of following them")
+	srcJar := flags.Bool("srcjar", false, "move .java files to locations that match their package statement")
 
 	parallelJobs := flags.Int("parallel", runtime.NumCPU(), "number of parallel threads to use")
 	cpuProfile := flags.String("cpuprofile", "", "write cpu profile to file")
@@ -191,6 +192,7 @@
 		FileArgs:                 fileArgsBuilder.FileArgs(),
 		OutputFilePath:           *out,
 		EmulateJar:               *emulateJar,
+		SrcJar:                   *srcJar,
 		AddDirectoryEntriesToZip: *directories,
 		CompressionLevel:         *compLevel,
 		ManifestSourcePath:       *manifest,
diff --git a/zip/zip.go b/zip/zip.go
index 1f5fe43..707c4ef 100644
--- a/zip/zip.go
+++ b/zip/zip.go
@@ -210,6 +210,7 @@
 	FileArgs                 []FileArg
 	OutputFilePath           string
 	EmulateJar               bool
+	SrcJar                   bool
 	AddDirectoryEntriesToZip bool
 	CompressionLevel         int
 	ManifestSourcePath       string
@@ -364,7 +365,7 @@
 		}
 	}
 
-	return z.write(w, pathMappings, args.ManifestSourcePath, args.EmulateJar, args.NumParallelJobs)
+	return z.write(w, pathMappings, args.ManifestSourcePath, args.EmulateJar, args.SrcJar, args.NumParallelJobs)
 }
 
 func Zip(args ZipArgs) error {
@@ -446,7 +447,9 @@
 	sort.SliceStable(mappings, less)
 }
 
-func (z *ZipWriter) write(f io.Writer, pathMappings []pathMapping, manifest string, emulateJar bool, parallelJobs int) error {
+func (z *ZipWriter) write(f io.Writer, pathMappings []pathMapping, manifest string, emulateJar, srcJar bool,
+	parallelJobs int) error {
+
 	z.errors = make(chan error)
 	defer close(z.errors)
 
@@ -489,7 +492,7 @@
 			if emulateJar && ele.dest == jar.ManifestFile {
 				err = z.addManifest(ele.dest, ele.src, ele.zipMethod)
 			} else {
-				err = z.addFile(ele.dest, ele.src, ele.zipMethod, emulateJar)
+				err = z.addFile(ele.dest, ele.src, ele.zipMethod, emulateJar, srcJar)
 			}
 			if err != nil {
 				z.errors <- err
@@ -588,7 +591,7 @@
 }
 
 // imports (possibly with compression) <src> into the zip at sub-path <dest>
-func (z *ZipWriter) addFile(dest, src string, method uint16, emulateJar bool) error {
+func (z *ZipWriter) addFile(dest, src string, method uint16, emulateJar, srcJar bool) error {
 	var fileSize int64
 	var executable bool
 
@@ -606,12 +609,9 @@
 			return nil
 		}
 		return err
-	} else if s.IsDir() {
-		if z.directories {
-			return z.writeDirectory(dest, src, emulateJar)
-		}
-		return nil
-	} else {
+	}
+
+	createParentDirs := func(dest, src string) error {
 		if err := z.writeDirectory(filepath.Dir(dest), src, emulateJar); err != nil {
 			return err
 		}
@@ -625,32 +625,64 @@
 
 		z.createdFiles[dest] = src
 
-		if s.Mode()&os.ModeSymlink != 0 {
-			return z.writeSymlink(dest, src)
-		} else if !s.Mode().IsRegular() {
-			return fmt.Errorf("%s is not a file, directory, or symlink", src)
+		return nil
+	}
+
+	if s.IsDir() {
+		if z.directories {
+			return z.writeDirectory(dest, src, emulateJar)
+		}
+		return nil
+	} else if s.Mode()&os.ModeSymlink != 0 {
+		err = createParentDirs(dest, src)
+		if err != nil {
+			return err
+		}
+
+		return z.writeSymlink(dest, src)
+	} else if s.Mode().IsRegular() {
+		r, err := z.fs.Open(src)
+		if err != nil {
+			return err
+		}
+
+		if srcJar && filepath.Ext(src) == ".java" {
+			// rewrite the destination using the package path if it can be determined
+			pkg, err := jar.JavaPackage(r, src)
+			if err != nil {
+				// ignore errors for now, leaving the file at in its original location in the zip
+			} else {
+				dest = filepath.Join(filepath.Join(strings.Split(pkg, ".")...), filepath.Base(src))
+			}
+
+			_, err = r.Seek(0, io.SeekStart)
+			if err != nil {
+				return err
+			}
 		}
 
 		fileSize = s.Size()
 		executable = s.Mode()&0100 != 0
-	}
 
-	r, err := z.fs.Open(src)
-	if err != nil {
-		return err
-	}
+		header := &zip.FileHeader{
+			Name:               dest,
+			Method:             method,
+			UncompressedSize64: uint64(fileSize),
+		}
 
-	header := &zip.FileHeader{
-		Name:               dest,
-		Method:             method,
-		UncompressedSize64: uint64(fileSize),
-	}
+		if executable {
+			header.SetMode(0700)
+		}
 
-	if executable {
-		header.SetMode(0700)
-	}
+		err = createParentDirs(dest, src)
+		if err != nil {
+			return err
+		}
 
-	return z.writeFileContents(header, r)
+		return z.writeFileContents(header, r)
+	} else {
+		return fmt.Errorf("%s is not a file, directory, or symlink", src)
+	}
 }
 
 func (z *ZipWriter) addManifest(dest string, src string, method uint16) error {
diff --git a/zip/zip_test.go b/zip/zip_test.go
index 93c5f3d..84317d1 100644
--- a/zip/zip_test.go
+++ b/zip/zip_test.go
@@ -40,14 +40,15 @@
 )
 
 var mockFs = pathtools.MockFs(map[string][]byte{
-	"a/a/a":            fileA,
-	"a/a/b":            fileB,
-	"a/a/c -> ../../c": nil,
-	"a/a/d -> b":       nil,
-	"c":                fileC,
-	"l":                []byte("a/a/a\na/a/b\nc\n"),
-	"l2":               []byte("missing\n"),
-	"manifest.txt":     fileCustomManifest,
+	"a/a/a":               fileA,
+	"a/a/b":               fileB,
+	"a/a/c -> ../../c":    nil,
+	"dangling -> missing": nil,
+	"a/a/d -> b":          nil,
+	"c":                   fileC,
+	"l":                   []byte("a/a/a\na/a/b\nc\n"),
+	"l2":                  []byte("missing\n"),
+	"manifest.txt":        fileCustomManifest,
 })
 
 func fh(name string, contents []byte, method uint16) zip.FileHeader {
@@ -210,6 +211,17 @@
 			},
 		},
 		{
+			name: "dangling symlinks",
+			args: fileArgsBuilder().
+				File("dangling"),
+			compressionLevel: 9,
+			storeSymlinks:    true,
+
+			files: []zip.FileHeader{
+				fhLink("dangling", "missing"),
+			},
+		},
+		{
 			name: "list",
 			args: fileArgsBuilder().
 				List("l"),
@@ -554,3 +566,70 @@
 		})
 	}
 }
+
+func TestSrcJar(t *testing.T) {
+	mockFs := pathtools.MockFs(map[string][]byte{
+		"wrong_package.java":       []byte("package foo;"),
+		"foo/correct_package.java": []byte("package foo;"),
+		"src/no_package.java":      nil,
+		"src2/parse_error.java":    []byte("error"),
+	})
+
+	want := []string{
+		"foo/",
+		"foo/wrong_package.java",
+		"foo/correct_package.java",
+		"no_package.java",
+		"src2/",
+		"src2/parse_error.java",
+	}
+
+	args := ZipArgs{}
+	args.FileArgs = NewFileArgsBuilder().File("**/*.java").FileArgs()
+
+	args.SrcJar = true
+	args.AddDirectoryEntriesToZip = true
+	args.Filesystem = mockFs
+	args.Stderr = &bytes.Buffer{}
+
+	buf := &bytes.Buffer{}
+	err := ZipTo(args, buf)
+	if err != nil {
+		t.Fatalf("got error %v", err)
+	}
+
+	br := bytes.NewReader(buf.Bytes())
+	zr, err := zip.NewReader(br, int64(br.Len()))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var got []string
+	for _, f := range zr.File {
+		r, err := f.Open()
+		if err != nil {
+			t.Fatalf("error when opening %s: %s", f.Name, err)
+		}
+
+		crc := crc32.NewIEEE()
+		len, err := io.Copy(crc, r)
+		r.Close()
+		if err != nil {
+			t.Fatalf("error when reading %s: %s", f.Name, err)
+		}
+
+		if uint64(len) != f.UncompressedSize64 {
+			t.Errorf("incorrect length for %s, want %d got %d", f.Name, f.UncompressedSize64, len)
+		}
+
+		if crc.Sum32() != f.CRC32 {
+			t.Errorf("incorrect crc for %s, want %x got %x", f.Name, f.CRC32, crc)
+		}
+
+		got = append(got, f.Name)
+	}
+
+	if !reflect.DeepEqual(want, got) {
+		t.Errorf("want files %q, got %q", want, got)
+	}
+}