Merge "Support empty srcs for configurable attrs"
diff --git a/TEST_MAPPING b/TEST_MAPPING
new file mode 100644
index 0000000..9f386ca
--- /dev/null
+++ b/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "imports": [
+    {
+      "path": "packages/modules/SdkExtensions"
+    }
+  ]
+}
diff --git a/android/apex.go b/android/apex.go
index 4b74436..4618fe9 100644
--- a/android/apex.go
+++ b/android/apex.go
@@ -117,19 +117,6 @@
 	return false
 }
 
-// InApexByBaseName tells whether this apex variant of the module is part of the given apexVariant
-// or not, where the APEX is specified by its canonical base name, i.e. typically beginning with
-// "com.android.". In particular this function doesn't differentiate between source and prebuilt
-// APEXes, where the latter may have "prebuilt_" prefixes.
-func (i ApexInfo) InApexVariantByBaseName(apexVariant string) bool {
-	for _, a := range i.InApexVariants {
-		if RemoveOptionalPrebuiltPrefix(a) == apexVariant {
-			return true
-		}
-	}
-	return false
-}
-
 func (i ApexInfo) InApexModule(apexModuleName string) bool {
 	for _, a := range i.InApexModules {
 		if a == apexModuleName {
@@ -669,8 +656,8 @@
 	mctx.VisitDirectDeps(func(dep Module) {
 		if _, ok := mctx.OtherModuleDependencyTag(dep).(CopyDirectlyInAnyApexTag); ok {
 			depBase := dep.(ApexModule).apexModuleBase()
-			base.ApexProperties.DirectlyInAnyApex = depBase.ApexProperties.DirectlyInAnyApex
-			base.ApexProperties.InAnyApex = depBase.ApexProperties.InAnyApex
+			depBase.ApexProperties.DirectlyInAnyApex = base.ApexProperties.DirectlyInAnyApex
+			depBase.ApexProperties.InAnyApex = base.ApexProperties.InAnyApex
 		}
 	})
 
diff --git a/apex/apex.go b/apex/apex.go
index 3448327..926085b 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -2020,7 +2020,7 @@
 	a.filesInfo = filesInfo
 
 	// Set suffix and primaryApexType depending on the ApexType
-	buildFlattenedAsDefault := ctx.Config().FlattenApex() && !ctx.Config().UnbundledBuildApps()
+	buildFlattenedAsDefault := ctx.Config().FlattenApex()
 	switch a.properties.ApexType {
 	case imageApex:
 		if buildFlattenedAsDefault {
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 364013f..4d00944 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -7611,6 +7611,80 @@
 		}))
 }
 
+func TestApexJavaCoverage(t *testing.T) {
+	bp := `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			java_libs: ["mylib"],
+			bootclasspath_fragments: ["mybootclasspathfragment"],
+			systemserverclasspath_fragments: ["mysystemserverclasspathfragment"],
+			updatable: false,
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+
+		java_library {
+			name: "mylib",
+			srcs: ["mylib.java"],
+			apex_available: ["myapex"],
+			compile_dex: true,
+		}
+
+		bootclasspath_fragment {
+			name: "mybootclasspathfragment",
+			contents: ["mybootclasspathlib"],
+			apex_available: ["myapex"],
+		}
+
+		java_library {
+			name: "mybootclasspathlib",
+			srcs: ["mybootclasspathlib.java"],
+			apex_available: ["myapex"],
+			compile_dex: true,
+		}
+
+		systemserverclasspath_fragment {
+			name: "mysystemserverclasspathfragment",
+			contents: ["mysystemserverclasspathlib"],
+			apex_available: ["myapex"],
+		}
+
+		java_library {
+			name: "mysystemserverclasspathlib",
+			srcs: ["mysystemserverclasspathlib.java"],
+			apex_available: ["myapex"],
+			compile_dex: true,
+		}
+	`
+
+	result := android.GroupFixturePreparers(
+		PrepareForTestWithApexBuildComponents,
+		prepareForTestWithMyapex,
+		java.PrepareForTestWithJavaDefaultModules,
+		android.PrepareForTestWithAndroidBuildComponents,
+		android.FixtureWithRootAndroidBp(bp),
+		android.FixtureMergeEnv(map[string]string{
+			"EMMA_INSTRUMENT": "true",
+		}),
+	).RunTest(t)
+
+	// Make sure jacoco ran on both mylib and mybootclasspathlib
+	if result.ModuleForTests("mylib", "android_common_apex10000").MaybeRule("jacoco").Rule == nil {
+		t.Errorf("Failed to find jacoco rule for mylib")
+	}
+	if result.ModuleForTests("mybootclasspathlib", "android_common_apex10000").MaybeRule("jacoco").Rule == nil {
+		t.Errorf("Failed to find jacoco rule for mybootclasspathlib")
+	}
+	if result.ModuleForTests("mysystemserverclasspathlib", "android_common_apex10000").MaybeRule("jacoco").Rule == nil {
+		t.Errorf("Failed to find jacoco rule for mysystemserverclasspathlib")
+	}
+}
+
 func TestMain(m *testing.M) {
 	os.Exit(m.Run())
 }
diff --git a/apex/prebuilt.go b/apex/prebuilt.go
index 6125ef5..81bfc86 100644
--- a/apex/prebuilt.go
+++ b/apex/prebuilt.go
@@ -228,10 +228,11 @@
 	})
 
 	// Create an ApexInfo for the prebuilt_apex.
+	apexVariationName := android.RemoveOptionalPrebuiltPrefix(mctx.ModuleName())
 	apexInfo := android.ApexInfo{
-		ApexVariationName: android.RemoveOptionalPrebuiltPrefix(mctx.ModuleName()),
-		InApexVariants:    []string{mctx.ModuleName()},
-		InApexModules:     []string{mctx.ModuleName()},
+		ApexVariationName: apexVariationName,
+		InApexVariants:    []string{apexVariationName},
+		InApexModules:     []string{apexVariationName},
 		ApexContents:      []*android.ApexContents{apexContents},
 		ForPrebuiltApex:   true,
 	}
diff --git a/bazel/properties.go b/bazel/properties.go
index 3904756..b9d6ead 100644
--- a/bazel/properties.go
+++ b/bazel/properties.go
@@ -331,49 +331,174 @@
 	HasConfigurableValues() bool
 }
 
-// Represents an attribute whose value is a single label
-type LabelAttribute struct {
-	Value  Label
+type labelArchValues struct {
 	X86    Label
 	X86_64 Label
 	Arm    Label
 	Arm64  Label
+
+	ConditionsDefault Label
+}
+
+type labelTargetValue struct {
+	// E.g. for android
+	OsValue Label
+
+	// E.g. for android_arm, android_arm64, ...
+	ArchValues labelArchValues
+}
+
+type labelTargetValues struct {
+	Android     labelTargetValue
+	Darwin      labelTargetValue
+	Fuchsia     labelTargetValue
+	Linux       labelTargetValue
+	LinuxBionic labelTargetValue
+	Windows     labelTargetValue
+
+	ConditionsDefault labelTargetValue
+}
+
+// Represents an attribute whose value is a single label
+type LabelAttribute struct {
+	Value Label
+
+	ArchValues labelArchValues
+
+	TargetValues labelTargetValues
 }
 
 func (attr *LabelAttribute) GetValueForArch(arch string) Label {
-	switch arch {
-	case ARCH_ARM:
-		return attr.Arm
-	case ARCH_ARM64:
-		return attr.Arm64
-	case ARCH_X86:
-		return attr.X86
-	case ARCH_X86_64:
-		return attr.X86_64
-	case CONDITIONS_DEFAULT:
-		return attr.Value
-	default:
-		panic("Invalid arch type")
+	var v *Label
+	if v = attr.archValuePtrs()[arch]; v == nil {
+		panic(fmt.Errorf("Unknown arch: %s", arch))
 	}
+	return *v
 }
 
 func (attr *LabelAttribute) SetValueForArch(arch string, value Label) {
-	switch arch {
-	case ARCH_ARM:
-		attr.Arm = value
-	case ARCH_ARM64:
-		attr.Arm64 = value
-	case ARCH_X86:
-		attr.X86 = value
-	case ARCH_X86_64:
-		attr.X86_64 = value
-	default:
-		panic("Invalid arch type")
+	var v *Label
+	if v = attr.archValuePtrs()[arch]; v == nil {
+		panic(fmt.Errorf("Unknown arch: %s", arch))
+	}
+	*v = value
+}
+
+func (attr *LabelAttribute) archValuePtrs() map[string]*Label {
+	return map[string]*Label{
+		ARCH_X86:           &attr.ArchValues.X86,
+		ARCH_X86_64:        &attr.ArchValues.X86_64,
+		ARCH_ARM:           &attr.ArchValues.Arm,
+		ARCH_ARM64:         &attr.ArchValues.Arm64,
+		CONDITIONS_DEFAULT: &attr.ArchValues.ConditionsDefault,
 	}
 }
 
 func (attr LabelAttribute) HasConfigurableValues() bool {
-	return attr.Arm.Label != "" || attr.Arm64.Label != "" || attr.X86.Label != "" || attr.X86_64.Label != ""
+	for arch := range PlatformArchMap {
+		if attr.GetValueForArch(arch).Label != "" {
+			return true
+		}
+	}
+
+	for os := range PlatformOsMap {
+		if attr.GetOsValueForTarget(os).Label != "" {
+			return true
+		}
+		// TODO(b/187530594): Should we also check arch=CONDITIONS_DEFAULT (not in AllArches)
+		for _, arch := range AllArches {
+			if attr.GetOsArchValueForTarget(os, arch).Label != "" {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func (attr *LabelAttribute) getValueForTarget(os string) labelTargetValue {
+	var v *labelTargetValue
+	if v = attr.targetValuePtrs()[os]; v == nil {
+		panic(fmt.Errorf("Unknown os: %s", os))
+	}
+	return *v
+}
+
+func (attr *LabelAttribute) GetOsValueForTarget(os string) Label {
+	var v *labelTargetValue
+	if v = attr.targetValuePtrs()[os]; v == nil {
+		panic(fmt.Errorf("Unknown os: %s", os))
+	}
+	return v.OsValue
+}
+
+func (attr *LabelAttribute) GetOsArchValueForTarget(os string, arch string) Label {
+	var v *labelTargetValue
+	if v = attr.targetValuePtrs()[os]; v == nil {
+		panic(fmt.Errorf("Unknown os: %s", os))
+	}
+	switch arch {
+	case ARCH_X86:
+		return v.ArchValues.X86
+	case ARCH_X86_64:
+		return v.ArchValues.X86_64
+	case ARCH_ARM:
+		return v.ArchValues.Arm
+	case ARCH_ARM64:
+		return v.ArchValues.Arm64
+	case CONDITIONS_DEFAULT:
+		return v.ArchValues.ConditionsDefault
+	default:
+		panic(fmt.Errorf("Unknown arch: %s\n", arch))
+	}
+}
+
+func (attr *LabelAttribute) setValueForTarget(os string, value labelTargetValue) {
+	var v *labelTargetValue
+	if v = attr.targetValuePtrs()[os]; v == nil {
+		panic(fmt.Errorf("Unknown os: %s", os))
+	}
+	*v = value
+}
+
+func (attr *LabelAttribute) SetOsValueForTarget(os string, value Label) {
+	var v *labelTargetValue
+	if v = attr.targetValuePtrs()[os]; v == nil {
+		panic(fmt.Errorf("Unknown os: %s", os))
+	}
+	v.OsValue = value
+}
+
+func (attr *LabelAttribute) SetOsArchValueForTarget(os string, arch string, value Label) {
+	var v *labelTargetValue
+	if v = attr.targetValuePtrs()[os]; v == nil {
+		panic(fmt.Errorf("Unknown os: %s", os))
+	}
+	switch arch {
+	case ARCH_X86:
+		v.ArchValues.X86 = value
+	case ARCH_X86_64:
+		v.ArchValues.X86_64 = value
+	case ARCH_ARM:
+		v.ArchValues.Arm = value
+	case ARCH_ARM64:
+		v.ArchValues.Arm64 = value
+	case CONDITIONS_DEFAULT:
+		v.ArchValues.ConditionsDefault = value
+	default:
+		panic(fmt.Errorf("Unknown arch: %s\n", arch))
+	}
+}
+
+func (attr *LabelAttribute) targetValuePtrs() map[string]*labelTargetValue {
+	return map[string]*labelTargetValue{
+		OS_ANDROID:         &attr.TargetValues.Android,
+		OS_DARWIN:          &attr.TargetValues.Darwin,
+		OS_FUCHSIA:         &attr.TargetValues.Fuchsia,
+		OS_LINUX:           &attr.TargetValues.Linux,
+		OS_LINUX_BIONIC:    &attr.TargetValues.LinuxBionic,
+		OS_WINDOWS:         &attr.TargetValues.Windows,
+		CONDITIONS_DEFAULT: &attr.TargetValues.ConditionsDefault,
+	}
 }
 
 // Arch-specific label_list typed Bazel attribute values. This should correspond
@@ -383,7 +508,6 @@
 	X86_64 LabelList
 	Arm    LabelList
 	Arm64  LabelList
-	Common LabelList
 
 	ConditionsDefault LabelList
 }
@@ -629,7 +753,6 @@
 	X86_64 []string
 	Arm    []string
 	Arm64  []string
-	Common []string
 
 	ConditionsDefault []string
 }
diff --git a/bp2build/cc_library_conversion_test.go b/bp2build/cc_library_conversion_test.go
index 6aa148e..49f1f42 100644
--- a/bp2build/cc_library_conversion_test.go
+++ b/bp2build/cc_library_conversion_test.go
@@ -808,3 +808,46 @@
 )`},
 	})
 }
+
+func TestCcLibraryLabelAttributeGetTargetProperties(t *testing.T) {
+	runCcLibraryTestCase(t, bp2buildTestCase{
+		description:                        "cc_library GetTargetProperties on a LabelAttribute",
+		moduleTypeUnderTest:                "cc_library",
+		moduleTypeUnderTestFactory:         cc.LibraryFactory,
+		moduleTypeUnderTestBp2BuildMutator: cc.CcLibraryBp2Build,
+		depsMutators:                       []android.RegisterMutatorFunc{cc.RegisterDepsBp2Build},
+		dir:                                "foo/bar",
+		filesystem: map[string]string{
+			"foo/bar/Android.bp": `
+		cc_library {
+		   name: "a",
+		   srcs: ["a.cpp"],
+		   target: {
+		     android_arm: {
+		       version_script: "android_arm.map",
+		     },
+		     linux_bionic_arm64: {
+		       version_script: "linux_bionic_arm64.map",
+		     },
+		   },
+
+		   bazel_module: { bp2build_available: true },
+		}
+		`,
+		},
+		blueprint: soongCcLibraryPreamble,
+		expectedBazelTargets: []string{`cc_library(
+    name = "a",
+    copts = [
+        "-Ifoo/bar",
+        "-I$(BINDIR)/foo/bar",
+    ],
+    srcs = ["a.cpp"],
+    version_script = select({
+        "//build/bazel/platforms:android_arm": "android_arm.map",
+        "//build/bazel/platforms:linux_bionic_arm64": "linux_bionic_arm64.map",
+        "//conditions:default": None,
+    }),
+)`},
+	})
+}
diff --git a/bp2build/configurability.go b/bp2build/configurability.go
index 42ff197..7e1a298 100644
--- a/bp2build/configurability.go
+++ b/bp2build/configurability.go
@@ -60,19 +60,67 @@
 }
 
 func getLabelValue(label bazel.LabelAttribute) (reflect.Value, []selects) {
-	var value reflect.Value
-	var archSelects selects
-
-	if label.HasConfigurableValues() {
-		archSelects = map[string]reflect.Value{}
-		for arch, selectKey := range bazel.PlatformArchMap {
-			archSelects[selectKey] = reflect.ValueOf(label.GetValueForArch(arch))
-		}
-	} else {
-		value = reflect.ValueOf(label.Value)
+	value := reflect.ValueOf(label.Value)
+	if !label.HasConfigurableValues() {
+		return value, []selects{}
 	}
 
-	return value, []selects{archSelects}
+	// Keep track of which arches and oses have been used in case we need to raise a warning
+	usedArches := make(map[string]bool)
+	usedOses := make(map[string]bool)
+
+	archSelects := map[string]reflect.Value{}
+	for arch, selectKey := range bazel.PlatformArchMap {
+		archSelects[selectKey] = reflect.ValueOf(label.GetValueForArch(arch))
+		if archSelects[selectKey].IsValid() && !isZero(archSelects[selectKey]) {
+			usedArches[arch] = true
+		}
+	}
+
+	osSelects := map[string]reflect.Value{}
+	for _, os := range android.SortedStringKeys(bazel.PlatformOsMap) {
+		selectKey := bazel.PlatformOsMap[os]
+		osSelects[selectKey] = reflect.ValueOf(label.GetOsValueForTarget(os))
+		if osSelects[selectKey].IsValid() && !isZero(osSelects[selectKey]) {
+			usedOses[os] = true
+		}
+	}
+
+	osArchSelects := make([]selects, 0)
+	for _, os := range android.SortedStringKeys(bazel.PlatformOsMap) {
+		archSelects := make(map[string]reflect.Value)
+		// TODO(b/187530594): Should we also check arch=CONDITIONS_DEFAULT? (not in AllArches)
+		for _, arch := range bazel.AllArches {
+			target := os + "_" + arch
+			selectKey := bazel.PlatformTargetMap[target]
+			archSelects[selectKey] = reflect.ValueOf(label.GetOsArchValueForTarget(os, arch))
+			if archSelects[selectKey].IsValid() && !isZero(archSelects[selectKey]) {
+				if _, ok := usedArches[arch]; ok {
+					fmt.Printf("WARNING: Same arch used twice in LabelAttribute select: arch '%s'\n", arch)
+				}
+				if _, ok := usedOses[os]; ok {
+					fmt.Printf("WARNING: Same os used twice in LabelAttribute select: os '%s'\n", os)
+				}
+			}
+		}
+		osArchSelects = append(osArchSelects, archSelects)
+	}
+
+	// Because we have to return a single Label, we can only use one select statement
+	combinedSelects := map[string]reflect.Value{}
+	for k, v := range archSelects {
+		combinedSelects[k] = v
+	}
+	for k, v := range osSelects {
+		combinedSelects[k] = v
+	}
+	for _, osArchSelect := range osArchSelects {
+		for k, v := range osArchSelect {
+			combinedSelects[k] = v
+		}
+	}
+
+	return value, []selects{combinedSelects}
 }
 
 func getLabelListValues(list bazel.LabelListAttribute) (reflect.Value, []selects) {
diff --git a/cc/bp2build.go b/cc/bp2build.go
index d96fd26..5d024f8 100644
--- a/cc/bp2build.go
+++ b/cc/bp2build.go
@@ -572,6 +572,10 @@
 
 			linkopts.SetOsValueForTarget(os.Name, getBp2BuildLinkerFlags(baseLinkerProps))
 
+			if baseLinkerProps.Version_script != nil {
+				versionScript.SetOsValueForTarget(os.Name, android.BazelLabelForModuleSrcSingle(ctx, *baseLinkerProps.Version_script))
+			}
+
 			sharedLibs := baseLinkerProps.Shared_libs
 			dynamicDeps.SetOsValueForTarget(os.Name, android.BazelLabelForModuleDeps(ctx, sharedLibs))
 		}
@@ -586,6 +590,10 @@
 
 				linkopts.SetOsArchValueForTarget(os.Name, arch.Name, getBp2BuildLinkerFlags(baseLinkerProps))
 
+				if baseLinkerProps.Version_script != nil {
+					versionScript.SetOsArchValueForTarget(os.Name, arch.Name, android.BazelLabelForModuleSrcSingle(ctx, *baseLinkerProps.Version_script))
+				}
+
 				sharedLibs := baseLinkerProps.Shared_libs
 				dynamicDeps.SetOsArchValueForTarget(os.Name, arch.Name, android.BazelLabelForModuleDeps(ctx, sharedLibs))
 			}
diff --git a/cc/cc.go b/cc/cc.go
index 8a34dad..aa218bf 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -729,12 +729,6 @@
 	llndkStubDepTag       = dependencyTag{name: "llndk stub"}
 )
 
-type copyDirectlyInAnyApexDependencyTag dependencyTag
-
-func (copyDirectlyInAnyApexDependencyTag) CopyDirectlyInAnyApex() {}
-
-var _ android.CopyDirectlyInAnyApexTag = copyDirectlyInAnyApexDependencyTag{}
-
 func IsSharedDepTag(depTag blueprint.DependencyTag) bool {
 	ccLibDepTag, ok := depTag.(libraryDependencyTag)
 	return ok && ccLibDepTag.shared()
diff --git a/cc/image.go b/cc/image.go
index 47a424b..c6b209f 100644
--- a/cc/image.go
+++ b/cc/image.go
@@ -579,7 +579,7 @@
 
 	// If using a snapshot, the recovery variant under AOSP directories is not needed,
 	// except for kernel headers, which needs all variants.
-	if m.KernelHeadersDecorator() &&
+	if !m.KernelHeadersDecorator() &&
 		!m.IsSnapshotPrebuilt() &&
 		usingRecoverySnapshot &&
 		!isRecoveryProprietaryModule(mctx) {
diff --git a/cmd/go2bp/Android.bp b/cmd/go2bp/Android.bp
new file mode 100644
index 0000000..53d70b6
--- /dev/null
+++ b/cmd/go2bp/Android.bp
@@ -0,0 +1,26 @@
+// Copyright 2021 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 {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+blueprint_go_binary {
+    name: "go2bp",
+    deps: [
+        "blueprint-proptools",
+        "bpfix-lib",
+    ],
+    srcs: ["go2bp.go"],
+}
diff --git a/cmd/go2bp/go2bp.go b/cmd/go2bp/go2bp.go
new file mode 100644
index 0000000..67138f1
--- /dev/null
+++ b/cmd/go2bp/go2bp.go
@@ -0,0 +1,361 @@
+// Copyright 2021 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 main
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"strings"
+	"text/template"
+
+	"github.com/google/blueprint/proptools"
+
+	"android/soong/bpfix/bpfix"
+)
+
+type RewriteNames []RewriteName
+type RewriteName struct {
+	prefix string
+	repl   string
+}
+
+func (r *RewriteNames) String() string {
+	return ""
+}
+
+func (r *RewriteNames) Set(v string) error {
+	split := strings.SplitN(v, "=", 2)
+	if len(split) != 2 {
+		return fmt.Errorf("Must be in the form of <prefix>=<replace>")
+	}
+	*r = append(*r, RewriteName{
+		prefix: split[0],
+		repl:   split[1],
+	})
+	return nil
+}
+
+func (r *RewriteNames) GoToBp(name string) string {
+	ret := name
+	for _, r := range *r {
+		prefix := r.prefix
+		if name == prefix {
+			ret = r.repl
+			break
+		}
+		prefix += "/"
+		if strings.HasPrefix(name, prefix) {
+			ret = r.repl + "-" + strings.TrimPrefix(name, prefix)
+		}
+	}
+	return strings.ReplaceAll(ret, "/", "-")
+}
+
+var rewriteNames = RewriteNames{}
+
+type Exclude map[string]bool
+
+func (e Exclude) String() string {
+	return ""
+}
+
+func (e Exclude) Set(v string) error {
+	e[v] = true
+	return nil
+}
+
+var excludes = make(Exclude)
+var excludeDeps = make(Exclude)
+var excludeSrcs = make(Exclude)
+
+type GoModule struct {
+	Dir string
+}
+
+type GoPackage struct {
+	Dir         string
+	ImportPath  string
+	Name        string
+	Imports     []string
+	GoFiles     []string
+	TestGoFiles []string
+	TestImports []string
+
+	Module *GoModule
+}
+
+func (g GoPackage) IsCommand() bool {
+	return g.Name == "main"
+}
+
+func (g GoPackage) BpModuleType() string {
+	if g.IsCommand() {
+		return "blueprint_go_binary"
+	}
+	return "bootstrap_go_package"
+}
+
+func (g GoPackage) BpName() string {
+	if g.IsCommand() {
+		return filepath.Base(g.ImportPath)
+	}
+	return rewriteNames.GoToBp(g.ImportPath)
+}
+
+func (g GoPackage) BpDeps(deps []string) []string {
+	var ret []string
+	for _, d := range deps {
+		// Ignore stdlib dependencies
+		if !strings.Contains(d, ".") {
+			continue
+		}
+		if _, ok := excludeDeps[d]; ok {
+			continue
+		}
+		name := rewriteNames.GoToBp(d)
+		ret = append(ret, name)
+	}
+	return ret
+}
+
+func (g GoPackage) BpSrcs(srcs []string) []string {
+	var ret []string
+	prefix, err := filepath.Rel(g.Module.Dir, g.Dir)
+	if err != nil {
+		panic(err)
+	}
+	for _, f := range srcs {
+		f = filepath.Join(prefix, f)
+		if _, ok := excludeSrcs[f]; ok {
+			continue
+		}
+		ret = append(ret, f)
+	}
+	return ret
+}
+
+// AllImports combines Imports and TestImports, as blueprint does not differentiate these.
+func (g GoPackage) AllImports() []string {
+	imports := append([]string(nil), g.Imports...)
+	imports = append(imports, g.TestImports...)
+
+	if len(imports) == 0 {
+		return nil
+	}
+
+	// Sort and de-duplicate
+	sort.Strings(imports)
+	j := 0
+	for i := 1; i < len(imports); i++ {
+		if imports[i] == imports[j] {
+			continue
+		}
+		j++
+		imports[j] = imports[i]
+	}
+	return imports[:j+1]
+}
+
+var bpTemplate = template.Must(template.New("bp").Parse(`
+{{.BpModuleType}} {
+    name: "{{.BpName}}",
+    {{- if not .IsCommand}}
+    pkgPath: "{{.ImportPath}}",
+    {{- end}}
+    {{- if .BpDeps .AllImports}}
+    deps: [
+        {{- range .BpDeps .AllImports}}
+        "{{.}}",
+        {{- end}}
+    ],
+    {{- end}}
+    {{- if .BpSrcs .GoFiles}}
+    srcs: [
+        {{- range .BpSrcs .GoFiles}}
+        "{{.}}",
+        {{- end}}
+    ],
+    {{- end}}
+    {{- if .BpSrcs .TestGoFiles}}
+    testSrcs: [
+    	{{- range .BpSrcs .TestGoFiles}}
+        "{{.}}",
+       {{- end}}
+    ],
+    {{- end}}
+}
+`))
+
+func rerunForRegen(filename string) error {
+	buf, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+
+	scanner := bufio.NewScanner(bytes.NewBuffer(buf))
+
+	// Skip the first line in the file
+	for i := 0; i < 2; i++ {
+		if !scanner.Scan() {
+			if scanner.Err() != nil {
+				return scanner.Err()
+			} else {
+				return fmt.Errorf("unexpected EOF")
+			}
+		}
+	}
+
+	// Extract the old args from the file
+	line := scanner.Text()
+	if strings.HasPrefix(line, "// go2bp ") {
+		line = strings.TrimPrefix(line, "// go2bp ")
+	} else {
+		return fmt.Errorf("unexpected second line: %q", line)
+	}
+	args := strings.Split(line, " ")
+	lastArg := args[len(args)-1]
+	args = args[:len(args)-1]
+
+	// Append all current command line args except -regen <file> to the ones from the file
+	for i := 1; i < len(os.Args); i++ {
+		if os.Args[i] == "-regen" || os.Args[i] == "--regen" {
+			i++
+		} else {
+			args = append(args, os.Args[i])
+		}
+	}
+	args = append(args, lastArg)
+
+	cmd := os.Args[0] + " " + strings.Join(args, " ")
+	// Re-exec pom2bp with the new arguments
+	output, err := exec.Command("/bin/sh", "-c", cmd).Output()
+	if exitErr, _ := err.(*exec.ExitError); exitErr != nil {
+		return fmt.Errorf("failed to run %s\n%s", cmd, string(exitErr.Stderr))
+	} else if err != nil {
+		return err
+	}
+
+	return ioutil.WriteFile(filename, output, 0666)
+}
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, `go2bp, a tool to create Android.bp files from go modules
+
+The tool will extract the necessary information from Go files to create an Android.bp that can
+compile them. This needs to be run from the same directory as the go.mod file.
+
+Usage: %s [--rewrite <pkg-prefix>=<replace>] [-exclude <package>] [-regen <file>]
+
+  -rewrite <pkg-prefix>=<replace>
+     rewrite can be used to specify mappings between go package paths and Android.bp modules. The -rewrite
+     option can be specified multiple times. When determining the Android.bp module for a given Go
+     package, mappings are searched in the order they were specified. The first <pkg-prefix> matching
+     either the package directly, or as the prefix '<pkg-prefix>/' will be replaced with <replace>.
+     After all replacements are finished, all '/' characters are replaced with '-'.
+  -exclude <package>
+     Don't put the specified go package in the Android.bp file.
+  -exclude-deps <package>
+     Don't put the specified go package in the dependency lists.
+  -exclude-srcs <module>
+     Don't put the specified source files in srcs or testSrcs lists.
+  -regen <file>
+     Read arguments from <file> and overwrite it.
+
+`, os.Args[0])
+	}
+
+	var regen string
+
+	flag.Var(&excludes, "exclude", "Exclude go package")
+	flag.Var(&excludeDeps, "exclude-dep", "Exclude go package from deps")
+	flag.Var(&excludeSrcs, "exclude-src", "Exclude go file from source lists")
+	flag.Var(&rewriteNames, "rewrite", "Regex(es) to rewrite artifact names")
+	flag.StringVar(&regen, "regen", "", "Rewrite specified file")
+	flag.Parse()
+
+	if regen != "" {
+		err := rerunForRegen(regen)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}
+
+	if flag.NArg() != 0 {
+		fmt.Fprintf(os.Stderr, "Unused argument detected: %v\n", flag.Args())
+		os.Exit(1)
+	}
+
+	if _, err := os.Stat("go.mod"); err != nil {
+		fmt.Fprintln(os.Stderr, "go.mod file not found")
+		os.Exit(1)
+	}
+
+	cmd := exec.Command("go", "list", "-json", "./...")
+	output, err := cmd.Output()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to dump the go packages: %v\n", err)
+		os.Exit(1)
+	}
+	decoder := json.NewDecoder(bytes.NewReader(output))
+
+	pkgs := []GoPackage{}
+	for decoder.More() {
+		pkg := GoPackage{}
+		err := decoder.Decode(&pkg)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "Failed to parse json: %v\n", err)
+			os.Exit(1)
+		}
+		pkgs = append(pkgs, pkg)
+	}
+
+	buf := &bytes.Buffer{}
+
+	fmt.Fprintln(buf, "// Automatically generated with:")
+	fmt.Fprintln(buf, "// go2bp", strings.Join(proptools.ShellEscapeList(os.Args[1:]), " "))
+
+	for _, pkg := range pkgs {
+		if excludes[pkg.ImportPath] {
+			continue
+		}
+		if len(pkg.BpSrcs(pkg.GoFiles)) == 0 && len(pkg.BpSrcs(pkg.TestGoFiles)) == 0 {
+			continue
+		}
+		err := bpTemplate.Execute(buf, pkg)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, "Error writing", pkg.Name, err)
+			os.Exit(1)
+		}
+	}
+
+	out, err := bpfix.Reformat(buf.String())
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Error formatting output", err)
+		os.Exit(1)
+	}
+
+	os.Stdout.WriteString(out)
+}
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index 7abb67f..0336fb6 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -17,7 +17,6 @@
 import (
 	"flag"
 	"fmt"
-	"io/fs"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -364,54 +363,41 @@
 // - won't be overwritten by corresponding bp2build generated files
 //
 // And return their paths so they can be left out of the Bazel workspace dir (i.e. ignored)
-func getPathsToIgnoredBuildFiles(topDir string, outDir string, generatedRoot string) ([]string, error) {
+func getPathsToIgnoredBuildFiles(topDir string, generatedRoot string, srcDirBazelFiles []string) []string {
 	paths := make([]string, 0)
 
-	err := filepath.WalkDir(topDir, func(fFullPath string, fDirEntry fs.DirEntry, err error) error {
+	for _, srcDirBazelFileRelativePath := range srcDirBazelFiles {
+		srcDirBazelFileFullPath := shared.JoinPath(topDir, srcDirBazelFileRelativePath)
+		fileInfo, err := os.Stat(srcDirBazelFileFullPath)
 		if err != nil {
-			// Warn about error, but continue trying to walk the directory tree
-			fmt.Fprintf(os.Stderr, "WARNING: Error accessing path '%s', err: %s\n", fFullPath, err)
-			return nil
+			// Warn about error, but continue trying to check files
+			fmt.Fprintf(os.Stderr, "WARNING: Error accessing path '%s', err: %s\n", srcDirBazelFileFullPath, err)
+			continue
 		}
-		if fDirEntry.IsDir() {
+		if fileInfo.IsDir() {
 			// Don't ignore entire directories
-			return nil
+			continue
 		}
-		if !(fDirEntry.Name() == "BUILD" || fDirEntry.Name() == "BUILD.bazel") {
+		if !(fileInfo.Name() == "BUILD" || fileInfo.Name() == "BUILD.bazel") {
 			// Don't ignore this file - it is not a build file
-			return nil
+			continue
 		}
-		f := strings.TrimPrefix(fFullPath, topDir+"/")
-		if strings.HasPrefix(f, ".repo/") {
-			// Don't check for files to ignore in the .repo dir (recursively)
-			return fs.SkipDir
-		}
-		if strings.HasPrefix(f, outDir+"/") {
-			// Don't check for files to ignore in the out dir (recursively)
-			return fs.SkipDir
-		}
-		if strings.HasPrefix(f, generatedRoot) {
-			// Don't check for files to ignore in the bp2build dir (recursively)
-			// NOTE: This is usually under outDir
-			return fs.SkipDir
-		}
-		fDir := filepath.Dir(f)
-		if android.ShouldKeepExistingBuildFileForDir(fDir) {
+		srcDirBazelFileDir := filepath.Dir(srcDirBazelFileRelativePath)
+		if android.ShouldKeepExistingBuildFileForDir(srcDirBazelFileDir) {
 			// Don't ignore this existing build file
-			return nil
+			continue
 		}
-		f_bp2build := shared.JoinPath(topDir, generatedRoot, f)
-		if _, err := os.Stat(f_bp2build); err == nil {
+		correspondingBp2BuildFile := shared.JoinPath(topDir, generatedRoot, srcDirBazelFileRelativePath)
+		if _, err := os.Stat(correspondingBp2BuildFile); err == nil {
 			// If bp2build generated an alternate BUILD file, don't exclude this workspace path
 			// BUILD file clash resolution happens later in the symlink forest creation
-			return nil
+			continue
 		}
-		fmt.Fprintf(os.Stderr, "Ignoring existing BUILD file: %s\n", f)
-		paths = append(paths, f)
-		return nil
-	})
+		fmt.Fprintf(os.Stderr, "Ignoring existing BUILD file: %s\n", srcDirBazelFileRelativePath)
+		paths = append(paths, srcDirBazelFileRelativePath)
+	}
 
-	return paths, err
+	return paths
 }
 
 // Returns temporary symlink forest excludes necessary for bazel build //external/... (and bazel build //frameworks/...) to work
@@ -431,6 +417,22 @@
 	return excludes
 }
 
+// Read the bazel.list file that the Soong Finder already dumped earlier (hopefully)
+// It contains the locations of BUILD files, BUILD.bazel files, etc. in the source dir
+func getExistingBazelRelatedFiles(topDir string) ([]string, error) {
+	bazelFinderFile := filepath.Join(filepath.Dir(bootstrap.CmdlineArgs.ModuleListFile), "bazel.list")
+	if !filepath.IsAbs(bazelFinderFile) {
+		// Assume this was a relative path under topDir
+		bazelFinderFile = filepath.Join(topDir, bazelFinderFile)
+	}
+	data, err := ioutil.ReadFile(bazelFinderFile)
+	if err != nil {
+		return nil, err
+	}
+	files := strings.Split(strings.TrimSpace(string(data)), "\n")
+	return files, nil
+}
+
 // Run Soong in the bp2build mode. This creates a standalone context that registers
 // an alternate pipeline of mutators and singletons specifically for generating
 // Bazel BUILD files instead of Ninja files.
@@ -489,14 +491,13 @@
 		excludes = append(excludes, bootstrap.CmdlineArgs.NinjaBuildDir)
 	}
 
-	// FIXME: Don't hardcode this here
-	topLevelOutDir := "out"
-
-	pathsToIgnoredBuildFiles, err := getPathsToIgnoredBuildFiles(topDir, topLevelOutDir, generatedRoot)
+	existingBazelRelatedFiles, err := getExistingBazelRelatedFiles(topDir)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error walking SrcDir: '%s': %s\n", configuration.SrcDir(), err)
+		fmt.Fprintf(os.Stderr, "Error determining existing Bazel-related files: %s\n", err)
 		os.Exit(1)
 	}
+
+	pathsToIgnoredBuildFiles := getPathsToIgnoredBuildFiles(topDir, generatedRoot, existingBazelRelatedFiles)
 	excludes = append(excludes, pathsToIgnoredBuildFiles...)
 
 	excludes = append(excludes, getTemporaryExcludes()...)
diff --git a/java/base.go b/java/base.go
index f7989b8..440b004 100644
--- a/java/base.go
+++ b/java/base.go
@@ -1778,3 +1778,9 @@
 func (j *Module) ProvidesUsesLib() *string {
 	return j.usesLibraryProperties.Provides_uses_lib
 }
+
+type ModuleWithStem interface {
+	Stem() string
+}
+
+var _ ModuleWithStem = (*Module)(nil)
diff --git a/java/bootclasspath_fragment.go b/java/bootclasspath_fragment.go
index 188d362..792193f 100644
--- a/java/bootclasspath_fragment.go
+++ b/java/bootclasspath_fragment.go
@@ -22,6 +22,7 @@
 
 	"android/soong/android"
 	"android/soong/dexpreopt"
+
 	"github.com/google/blueprint/proptools"
 
 	"github.com/google/blueprint"
@@ -76,12 +77,17 @@
 	return true
 }
 
+// Contents of bootclasspath fragments in an apex are considered to be directly in the apex, as if
+// they were listed in java_libs.
+func (b bootclasspathFragmentContentDependencyTag) CopyDirectlyInAnyApex() {}
+
 // The tag used for the dependency between the bootclasspath_fragment module and its contents.
 var bootclasspathFragmentContentDepTag = bootclasspathFragmentContentDependencyTag{}
 
 var _ android.ExcludeFromVisibilityEnforcementTag = bootclasspathFragmentContentDepTag
 var _ android.ReplaceSourceWithPrebuilt = bootclasspathFragmentContentDepTag
 var _ android.SdkMemberTypeDependencyTag = bootclasspathFragmentContentDepTag
+var _ android.CopyDirectlyInAnyApexTag = bootclasspathFragmentContentDepTag
 
 func IsBootclasspathFragmentContentDepTag(tag blueprint.DependencyTag) bool {
 	return tag == bootclasspathFragmentContentDepTag
@@ -496,10 +502,21 @@
 
 	global := dexpreopt.GetGlobalConfig(ctx)
 
+	// Convert content names to their appropriate stems, in case a test library is overriding an actual boot jar
+	var stems []string
+	for _, name := range b.properties.Contents {
+		dep := ctx.GetDirectDepWithTag(name, bootclasspathFragmentContentDepTag)
+		if m, ok := dep.(ModuleWithStem); ok {
+			stems = append(stems, m.Stem())
+		} else {
+			ctx.PropertyErrorf("contents", "%v is not a ModuleWithStem", name)
+		}
+	}
+
 	// Only create configs for updatable boot jars. Non-updatable boot jars must be part of the
 	// platform_bootclasspath's classpath proto config to guarantee that they come before any
 	// updatable jars at runtime.
-	return global.UpdatableBootJars.Filter(b.properties.Contents)
+	return global.UpdatableBootJars.Filter(stems)
 }
 
 func (b *BootclasspathFragmentModule) getImageConfig(ctx android.EarlyModuleContext) *bootImageConfig {
diff --git a/java/hiddenapi_singleton.go b/java/hiddenapi_singleton.go
index bdf055a..52934a3 100644
--- a/java/hiddenapi_singleton.go
+++ b/java/hiddenapi_singleton.go
@@ -171,7 +171,7 @@
 			// A platform variant is required but this is for an apex so ignore it.
 			return false
 		}
-	} else if !apexInfo.InApexVariantByBaseName(requiredApex) {
+	} else if !apexInfo.InApexVariant(requiredApex) {
 		// An apex variant for a specific apex is required but this is the wrong apex.
 		return false
 	}
diff --git a/java/systemserver_classpath_fragment.go b/java/systemserver_classpath_fragment.go
index 9111c30..7ffb056 100644
--- a/java/systemserver_classpath_fragment.go
+++ b/java/systemserver_classpath_fragment.go
@@ -17,6 +17,7 @@
 import (
 	"android/soong/android"
 	"android/soong/dexpreopt"
+
 	"github.com/google/blueprint"
 )
 
@@ -97,16 +98,33 @@
 func (s *SystemServerClasspathModule) ClasspathFragmentToConfiguredJarList(ctx android.ModuleContext) android.ConfiguredJarList {
 	global := dexpreopt.GetGlobalConfig(ctx)
 
+	// Convert content names to their appropriate stems, in case a test library is overriding an actual boot jar
+	var stems []string
+	for _, name := range s.properties.Contents {
+		dep := ctx.GetDirectDepWithTag(name, systemServerClasspathFragmentContentDepTag)
+		if m, ok := dep.(ModuleWithStem); ok {
+			stems = append(stems, m.Stem())
+		} else {
+			ctx.PropertyErrorf("contents", "%v is not a ModuleWithStem", name)
+		}
+	}
+
 	// Only create configs for updatable boot jars. Non-updatable system server jars must be part of the
 	// platform_systemserverclasspath's classpath proto config to guarantee that they come before any
 	// updatable jars at runtime.
-	return global.UpdatableSystemServerJars.Filter(s.properties.Contents)
+	return global.UpdatableSystemServerJars.Filter(stems)
 }
 
 type systemServerClasspathFragmentContentDependencyTag struct {
 	blueprint.BaseDependencyTag
 }
 
+// Contents of system server fragments in an apex are considered to be directly in the apex, as if
+// they were listed in java_libs.
+func (systemServerClasspathFragmentContentDependencyTag) CopyDirectlyInAnyApex() {}
+
+var _ android.CopyDirectlyInAnyApexTag = systemServerClasspathFragmentContentDepTag
+
 // The tag used for the dependency between the systemserverclasspath_fragment module and its contents.
 var systemServerClasspathFragmentContentDepTag = systemServerClasspathFragmentContentDependencyTag{}