Merge changes from topic "roll-rust-1.47.0"

* changes:
  Use Rust 1.47.0 prebuilts
  rust: set STD_ENV_ARCH
diff --git a/android/config.go b/android/config.go
index a499057..e87a4ac 100644
--- a/android/config.go
+++ b/android/config.go
@@ -974,13 +974,21 @@
 	return c.productVariables.ModulesLoadedByPrivilegedModules
 }
 
-func (c *config) DexpreoptGlobalConfig(ctx PathContext) ([]byte, error) {
+func (c *config) DexpreoptGlobalConfigPath(ctx PathContext) OptionalPath {
 	if c.productVariables.DexpreoptGlobalConfig == nil {
+		return OptionalPathForPath(nil)
+	}
+	return OptionalPathForPath(
+		pathForBuildToolDep(ctx, *c.productVariables.DexpreoptGlobalConfig))
+}
+
+func (c *config) DexpreoptGlobalConfig(ctx PathContext) ([]byte, error) {
+	path := c.DexpreoptGlobalConfigPath(ctx)
+	if !path.Valid() {
 		return nil, nil
 	}
-	path := absolutePath(*c.productVariables.DexpreoptGlobalConfig)
-	ctx.AddNinjaFileDeps(path)
-	return ioutil.ReadFile(path)
+	ctx.AddNinjaFileDeps(path.String())
+	return ioutil.ReadFile(absolutePath(path.String()))
 }
 
 func (c *config) FrameworksBaseDirExists(ctx PathContext) bool {
diff --git a/android/writedocs.go b/android/writedocs.go
index 4eb15e6..91c2318 100644
--- a/android/writedocs.go
+++ b/android/writedocs.go
@@ -48,6 +48,13 @@
 	deps = append(deps, pathForBuildToolDep(ctx, ctx.Config().moduleListFile))
 	deps = append(deps, pathForBuildToolDep(ctx, ctx.Config().ProductVariablesFileName))
 
+	// The dexpreopt configuration may not exist, but if it does, it's a dependency
+	// of soong_build.
+	dexpreoptConfigPath := ctx.Config().DexpreoptGlobalConfigPath(ctx)
+	if dexpreoptConfigPath.Valid() {
+		deps = append(deps, dexpreoptConfigPath.Path())
+	}
+
 	// Generate build system docs for the primary builder.  Generating docs reads the source
 	// files used to build the primary builder, but that dependency will be picked up through
 	// the dependency on the primary builder itself.  There are no dependencies on the
diff --git a/apex/allowed_deps.txt b/apex/allowed_deps.txt
index e5b91e5..8c70a56 100644
--- a/apex/allowed_deps.txt
+++ b/apex/allowed_deps.txt
@@ -235,6 +235,7 @@
 libc_headers(minSdkVersion:apex_inherit)
 libc_headers_arch(minSdkVersion:apex_inherit)
 libcap(minSdkVersion:29)
+libclang_rt.hwasan-aarch64-android.llndk(minSdkVersion:(no version))
 libcodec2(minSdkVersion:29)
 libcodec2_headers(minSdkVersion:29)
 libcodec2_hidl@1.0(minSdkVersion:29)
diff --git a/apex/apex.go b/apex/apex.go
index b02711e..fdc105e 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -276,8 +276,6 @@
 		"libc_malloc_debug_backtrace",
 		"libcamera_client",
 		"libcamera_metadata",
-		"libdexfile_external_headers",
-		"libdexfile_support",
 		"libdvr_headers",
 		"libexpat",
 		"libfifo",
@@ -304,10 +302,6 @@
 		"libmp4extractor",
 		"libmpeg2extractor",
 		"libnativebase_headers",
-		"libnativebridge-headers",
-		"libnativebridge_lazy",
-		"libnativeloader-headers",
-		"libnativeloader_lazy",
 		"libnativewindow_headers",
 		"libnblog",
 		"liboggextractor",
@@ -431,7 +425,6 @@
 		"libcodec2_soft_vp9dec",
 		"libcodec2_soft_vp9enc",
 		"libcodec2_vndk",
-		"libdexfile_support",
 		"libdvr_headers",
 		"libfmq",
 		"libfmq",
@@ -454,8 +447,6 @@
 		"libmedia_headers",
 		"libmpeg2dec",
 		"libnativebase_headers",
-		"libnativebridge_lazy",
-		"libnativeloader_lazy",
 		"libnativewindow_headers",
 		"libpdx_headers",
 		"libscudo_wrapper",
@@ -563,8 +554,6 @@
 		"libdebuggerd_common_headers",
 		"libdebuggerd_handler_core",
 		"libdebuggerd_handler_fallback",
-		"libdexfile_external_headers",
-		"libdexfile_support",
 		"libdl_static",
 		"libjemalloc5",
 		"liblinker_main",
diff --git a/apex/apex_singleton.go b/apex/apex_singleton.go
index 803e0c5..ee9fc81 100644
--- a/apex/apex_singleton.go
+++ b/apex/apex_singleton.go
@@ -100,6 +100,8 @@
 			"new_allowed_deps": newAllowedDeps.String(),
 		},
 	})
+
+	ctx.Phony("apex-allowed-deps-check", s.allowedApexDepsInfoCheckResult)
 }
 
 func (s *apexDepsInfoSingleton) MakeVars(ctx android.MakeVarsContext) {
diff --git a/cc/vndk_prebuilt.go b/cc/vndk_prebuilt.go
index dddd5ac..6029f5a 100644
--- a/cc/vndk_prebuilt.go
+++ b/cc/vndk_prebuilt.go
@@ -52,7 +52,7 @@
 	// VNDK snapshot version.
 	Version *string
 
-	// Target arch name of the snapshot (e.g. 'arm64' for variant 'aosp_arm64_ab')
+	// Target arch name of the snapshot (e.g. 'arm64' for variant 'aosp_arm64')
 	Target_arch *string
 
 	// If the prebuilt snapshot lib is built with 32 bit binder, this must be set to true.
diff --git a/cmd/soong_build/bazel_overlay.go b/cmd/soong_build/bazel_overlay.go
index cdc5775..fc1b492 100644
--- a/cmd/soong_build/bazel_overlay.go
+++ b/cmd/soong_build/bazel_overlay.go
@@ -370,7 +370,7 @@
 
 		// Canonicalize and normalize module property types to Bazel attribute types
 		starlarkAttrType := prop.Type
-		if starlarkAttrType == "list of strings" {
+		if starlarkAttrType == "list of string" {
 			starlarkAttrType = "string_list"
 		} else if starlarkAttrType == "int64" {
 			starlarkAttrType = "int"
diff --git a/cmd/soong_build/bazel_overlay_test.go b/cmd/soong_build/bazel_overlay_test.go
index de060bb..548888e 100644
--- a/cmd/soong_build/bazel_overlay_test.go
+++ b/cmd/soong_build/bazel_overlay_test.go
@@ -277,7 +277,7 @@
 		},
 		bpdoc.Property{
 			Name: "string_list_prop",
-			Type: "list of strings",
+			Type: "list of string",
 		},
 		bpdoc.Property{
 			Name: "nested_prop",
diff --git a/python/python.go b/python/python.go
index 479c729..945e264 100644
--- a/python/python.go
+++ b/python/python.go
@@ -101,6 +101,13 @@
 	// this property name is hidden from users' perspectives, and soong will populate it during
 	// runtime.
 	Actual_version string `blueprint:"mutated"`
+
+	// true, if the module is required to be built with actual_version.
+	Enabled *bool `blueprint:"mutated"`
+
+	// true, if the binary is required to be built with embedded launcher.
+	// TODO(nanzhang): Remove this flag when embedded Python3 is supported later.
+	Embedded_launcher *bool `blueprint:"mutated"`
 }
 
 type pathMapping struct {
@@ -228,15 +235,18 @@
 	return func(mctx android.BottomUpMutatorContext) {
 		if base, ok := mctx.Module().(*Module); ok {
 			versionNames := []string{}
+			versionProps := []VersionProperties{}
 			// PY3 is first so that we alias the PY3 variant rather than PY2 if both
 			// are available
 			if !(base.properties.Version.Py3.Enabled != nil &&
 				*(base.properties.Version.Py3.Enabled) == false) {
 				versionNames = append(versionNames, pyVersion3)
+				versionProps = append(versionProps, base.properties.Version.Py3)
 			}
 			if base.properties.Version.Py2.Enabled != nil &&
 				*(base.properties.Version.Py2.Enabled) == true {
 				versionNames = append(versionNames, pyVersion2)
+				versionProps = append(versionProps, base.properties.Version.Py2)
 			}
 			modules := mctx.CreateVariations(versionNames...)
 			if len(versionNames) > 0 {
@@ -245,6 +255,11 @@
 			for i, v := range versionNames {
 				// set the actual version for Python module.
 				modules[i].(*Module).properties.Actual_version = v
+				// append versioned properties for the Python module
+				err := proptools.AppendMatchingProperties([]interface{}{&modules[i].(*Module).properties}, &versionProps[i], nil)
+				if err != nil {
+					panic(err)
+				}
 			}
 		}
 	}
@@ -270,15 +285,8 @@
 	}
 }
 
-func (p *Module) isEmbeddedLauncherEnabled(actual_version string) bool {
-	switch actual_version {
-	case pyVersion2:
-		return Bool(p.properties.Version.Py2.Embedded_launcher)
-	case pyVersion3:
-		return Bool(p.properties.Version.Py3.Embedded_launcher)
-	}
-
-	return false
+func (p *Module) isEmbeddedLauncherEnabled() bool {
+	return Bool(p.properties.Embedded_launcher)
 }
 
 func hasSrcExt(srcs []string, ext string) bool {
@@ -292,18 +300,7 @@
 }
 
 func (p *Module) hasSrcExt(ctx android.BottomUpMutatorContext, ext string) bool {
-	if hasSrcExt(p.properties.Srcs, protoExt) {
-		return true
-	}
-	switch p.properties.Actual_version {
-	case pyVersion2:
-		return hasSrcExt(p.properties.Version.Py2.Srcs, protoExt)
-	case pyVersion3:
-		return hasSrcExt(p.properties.Version.Py3.Srcs, protoExt)
-	default:
-		panic(fmt.Errorf("unknown Python Actual_version: %q for module: %q.",
-			p.properties.Actual_version, ctx.ModuleName()))
-	}
+	return hasSrcExt(p.properties.Srcs, protoExt)
 }
 
 func (p *Module) DepsMutator(ctx android.BottomUpMutatorContext) {
@@ -312,13 +309,12 @@
 	if p.hasSrcExt(ctx, protoExt) && p.Name() != "libprotobuf-python" {
 		ctx.AddVariationDependencies(nil, pythonLibTag, "libprotobuf-python")
 	}
+	ctx.AddVariationDependencies(nil, pythonLibTag, android.LastUniqueStrings(p.properties.Libs)...)
+
 	switch p.properties.Actual_version {
 	case pyVersion2:
-		ctx.AddVariationDependencies(nil, pythonLibTag,
-			uniqueLibs(ctx, p.properties.Libs, "version.py2.libs",
-				p.properties.Version.Py2.Libs)...)
 
-		if p.bootstrapper != nil && p.isEmbeddedLauncherEnabled(pyVersion2) {
+		if p.bootstrapper != nil && p.isEmbeddedLauncherEnabled() {
 			ctx.AddVariationDependencies(nil, pythonLibTag, "py2-stdlib")
 
 			launcherModule := "py2-launcher"
@@ -340,11 +336,8 @@
 		}
 
 	case pyVersion3:
-		ctx.AddVariationDependencies(nil, pythonLibTag,
-			uniqueLibs(ctx, p.properties.Libs, "version.py3.libs",
-				p.properties.Version.Py3.Libs)...)
 
-		if p.bootstrapper != nil && p.isEmbeddedLauncherEnabled(pyVersion3) {
+		if p.bootstrapper != nil && p.isEmbeddedLauncherEnabled() {
 			ctx.AddVariationDependencies(nil, pythonLibTag, "py3-stdlib")
 
 			launcherModule := "py3-launcher"
@@ -375,34 +368,6 @@
 	}
 }
 
-// check "libs" duplicates from current module dependencies.
-func uniqueLibs(ctx android.BottomUpMutatorContext,
-	commonLibs []string, versionProp string, versionLibs []string) []string {
-	set := make(map[string]string)
-	ret := []string{}
-
-	// deps from "libs" property.
-	for _, l := range commonLibs {
-		if _, found := set[l]; found {
-			ctx.PropertyErrorf("libs", "%q has duplicates within libs.", l)
-		} else {
-			set[l] = "libs"
-			ret = append(ret, l)
-		}
-	}
-	// deps from "version.pyX.libs" property.
-	for _, l := range versionLibs {
-		if _, found := set[l]; found {
-			ctx.PropertyErrorf(versionProp, "%q has duplicates within %q.", set[l])
-		} else {
-			set[l] = versionProp
-			ret = append(ret, l)
-		}
-	}
-
-	return ret
-}
-
 func (p *Module) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	p.GeneratePythonBuildActions(ctx)
 
@@ -410,11 +375,7 @@
 	if p.bootstrapper != nil {
 		p.walkTransitiveDeps(ctx)
 		embeddedLauncher := false
-		if p.properties.Actual_version == pyVersion2 {
-			embeddedLauncher = p.isEmbeddedLauncherEnabled(pyVersion2)
-		} else {
-			embeddedLauncher = p.isEmbeddedLauncherEnabled(pyVersion3)
-		}
+		embeddedLauncher = p.isEmbeddedLauncherEnabled()
 		p.installSource = p.bootstrapper.bootstrap(ctx, p.properties.Actual_version,
 			embeddedLauncher, p.srcsPathMappings, p.srcsZip, p.depsSrcsZips)
 	}
@@ -439,17 +400,6 @@
 	// expand python files from "srcs" property.
 	srcs := p.properties.Srcs
 	exclude_srcs := p.properties.Exclude_srcs
-	switch p.properties.Actual_version {
-	case pyVersion2:
-		srcs = append(srcs, p.properties.Version.Py2.Srcs...)
-		exclude_srcs = append(exclude_srcs, p.properties.Version.Py2.Exclude_srcs...)
-	case pyVersion3:
-		srcs = append(srcs, p.properties.Version.Py3.Srcs...)
-		exclude_srcs = append(exclude_srcs, p.properties.Version.Py3.Exclude_srcs...)
-	default:
-		panic(fmt.Errorf("unknown Python Actual_version: %q for module: %q.",
-			p.properties.Actual_version, ctx.ModuleName()))
-	}
 	expandedSrcs := android.PathsForModuleSrcExcludes(ctx, srcs, exclude_srcs)
 	requiresSrcs := true
 	if p.bootstrapper != nil && !p.bootstrapper.autorun() {
diff --git a/python/python_test.go b/python/python_test.go
index 23db24e..10b565a 100644
--- a/python/python_test.go
+++ b/python/python_test.go
@@ -395,10 +395,11 @@
 
 	if !reflect.DeepEqual(actualPyRunfiles, expectedPyRunfiles) {
 		testErrs = append(testErrs, errors.New(fmt.Sprintf(
-			`binary "%s" variant "%s" has unexpected pyRunfiles: %q!`,
+			`binary "%s" variant "%s" has unexpected pyRunfiles: %q! (expected: %q)`,
 			base.Name(),
 			base.properties.Actual_version,
-			actualPyRunfiles)))
+			actualPyRunfiles,
+			expectedPyRunfiles)))
 	}
 
 	if base.srcsZip.String() != strings.Replace(expectedSrcsZip, "@prefix@", buildDir, 1) {
diff --git a/rust/bindgen.go b/rust/bindgen.go
index 3db2d65..09af649 100644
--- a/rust/bindgen.go
+++ b/rust/bindgen.go
@@ -32,7 +32,7 @@
 	bindgenClangVersion = "clang-r383902c"
 
 	//TODO(b/160803703) Use a prebuilt bindgen instead of the built bindgen.
-	_ = pctx.SourcePathVariable("bindgenCmd", "out/host/${config.HostPrebuiltTag}/bin/bindgen")
+	_ = pctx.HostBinToolVariable("bindgenCmd", "bindgen")
 	_ = pctx.SourcePathVariable("bindgenClang",
 		"${cc_config.ClangBase}/${config.HostPrebuiltTag}/"+bindgenClangVersion+"/bin/clang")
 	_ = pctx.SourcePathVariable("bindgenLibClang",
diff --git a/rust/protobuf.go b/rust/protobuf.go
index ebb1c3c..28a4597 100644
--- a/rust/protobuf.go
+++ b/rust/protobuf.go
@@ -22,9 +22,18 @@
 	defaultProtobufFlags = []string{""}
 )
 
+type PluginType int
+
+const (
+	Protobuf PluginType = iota
+	Grpc
+)
+
 func init() {
 	android.RegisterModuleType("rust_protobuf", RustProtobufFactory)
 	android.RegisterModuleType("rust_protobuf_host", RustProtobufHostFactory)
+	android.RegisterModuleType("rust_grpcio", RustGrpcioFactory)
+	android.RegisterModuleType("rust_grpcio_host", RustGrpcioHostFactory)
 }
 
 var _ SourceProvider = (*protobufDecorator)(nil)
@@ -41,15 +50,18 @@
 	*BaseSourceProvider
 
 	Properties ProtobufProperties
+	plugin     PluginType
 }
 
 func (proto *protobufDecorator) GenerateSource(ctx ModuleContext, deps PathDeps) android.Path {
 	var protoFlags android.ProtoFlags
-	pluginPath := ctx.Config().HostToolPath(ctx, "protoc-gen-rust")
+	var pluginPath android.Path
 
 	protoFlags.OutTypeFlag = "--rust_out"
+	outDir := android.PathForModuleOut(ctx)
 
-	protoFlags.Flags = append(protoFlags.Flags, " --plugin="+pluginPath.String())
+	pluginPath, protoFlags = proto.setupPlugin(ctx, protoFlags, outDir)
+
 	protoFlags.Flags = append(protoFlags.Flags, defaultProtobufFlags...)
 	protoFlags.Flags = append(protoFlags.Flags, proto.Properties.Proto_flags...)
 
@@ -60,7 +72,6 @@
 		ctx.PropertyErrorf("proto", "invalid path to proto file")
 	}
 
-	outDir := android.PathForModuleOut(ctx)
 	stem := proto.BaseSourceProvider.getStem(ctx)
 	// rust protobuf-codegen output <stem>.rs
 	stemFile := android.PathForModuleOut(ctx, stem+".rs")
@@ -79,6 +90,23 @@
 	return modFile
 }
 
+func (proto *protobufDecorator) setupPlugin(ctx ModuleContext, protoFlags android.ProtoFlags, outDir android.ModuleOutPath) (android.Path, android.ProtoFlags) {
+	var pluginPath android.Path
+
+	if proto.plugin == Protobuf {
+		pluginPath = ctx.Config().HostToolPath(ctx, "protoc-gen-rust")
+		protoFlags.Flags = append(protoFlags.Flags, "--plugin="+pluginPath.String())
+	} else if proto.plugin == Grpc {
+		pluginPath = ctx.Config().HostToolPath(ctx, "grpc_rust_plugin")
+		protoFlags.Flags = append(protoFlags.Flags, "--grpc_out="+outDir.String())
+		protoFlags.Flags = append(protoFlags.Flags, "--plugin=protoc-gen-grpc="+pluginPath.String())
+	} else {
+		ctx.ModuleErrorf("Unknown protobuf plugin type requested")
+	}
+
+	return pluginPath, protoFlags
+}
+
 func (proto *protobufDecorator) SourceProviderProps() []interface{} {
 	return append(proto.BaseSourceProvider.SourceProviderProps(), &proto.Properties)
 }
@@ -104,10 +132,34 @@
 	return module.Init()
 }
 
+func RustGrpcioFactory() android.Module {
+	module, _ := NewRustGrpcio(android.HostAndDeviceSupported)
+	return module.Init()
+}
+
+// A host-only variant of rust_protobuf. Refer to rust_protobuf for more details.
+func RustGrpcioHostFactory() android.Module {
+	module, _ := NewRustGrpcio(android.HostSupported)
+	return module.Init()
+}
+
 func NewRustProtobuf(hod android.HostOrDeviceSupported) (*Module, *protobufDecorator) {
 	protobuf := &protobufDecorator{
 		BaseSourceProvider: NewSourceProvider(),
 		Properties:         ProtobufProperties{},
+		plugin:             Protobuf,
+	}
+
+	module := NewSourceProviderModule(hod, protobuf, false)
+
+	return module, protobuf
+}
+
+func NewRustGrpcio(hod android.HostOrDeviceSupported) (*Module, *protobufDecorator) {
+	protobuf := &protobufDecorator{
+		BaseSourceProvider: NewSourceProvider(),
+		Properties:         ProtobufProperties{},
+		plugin:             Grpc,
 	}
 
 	module := NewSourceProviderModule(hod, protobuf, false)
diff --git a/rust/protobuf_test.go b/rust/protobuf_test.go
index bd11a5a..7c39071 100644
--- a/rust/protobuf_test.go
+++ b/rust/protobuf_test.go
@@ -15,8 +15,10 @@
 package rust
 
 import (
-	"android/soong/android"
+	"strings"
 	"testing"
+
+	"android/soong/android"
 )
 
 func TestRustProtobuf(t *testing.T) {
@@ -28,12 +30,41 @@
 			source_stem: "buf",
 		}
 	`)
-	// Check that there's a rule to generate the expected output
-	_ = ctx.ModuleForTests("librust_proto", "android_arm64_armv8-a_source").Output("buf.rs")
-
 	// Check that libprotobuf is added as a dependency.
 	librust_proto := ctx.ModuleForTests("librust_proto", "android_arm64_armv8-a_dylib").Module().(*Module)
 	if !android.InList("libprotobuf", librust_proto.Properties.AndroidMkDylibs) {
 		t.Errorf("libprotobuf dependency missing for rust_protobuf (dependency missing from AndroidMkDylibs)")
 	}
+
+	// Make sure the correct plugin is being used.
+	librust_proto_out := ctx.ModuleForTests("librust_proto", "android_arm64_armv8-a_source").Output("buf.rs")
+	cmd := librust_proto_out.RuleParams.Command
+	if w := "protoc-gen-rust"; !strings.Contains(cmd, w) {
+		t.Errorf("expected %q in %q", w, cmd)
+	}
+
+}
+
+func TestRustGrpcio(t *testing.T) {
+	ctx := testRust(t, `
+		rust_grpcio {
+			name: "librust_grpcio",
+			proto: "buf.proto",
+			crate_name: "rust_grpcio",
+			source_stem: "buf",
+		}
+	`)
+
+	// Check that libprotobuf is added as a dependency.
+	librust_grpcio_module := ctx.ModuleForTests("librust_grpcio", "android_arm64_armv8-a_dylib").Module().(*Module)
+	if !android.InList("libprotobuf", librust_grpcio_module.Properties.AndroidMkDylibs) {
+		t.Errorf("libprotobuf dependency missing for rust_grpcio (dependency missing from AndroidMkDylibs)")
+	}
+
+	// Make sure the correct plugin is being used.
+	librust_grpcio_out := ctx.ModuleForTests("librust_grpcio", "android_arm64_armv8-a_source").Output("buf.rs")
+	cmd := librust_grpcio_out.RuleParams.Command
+	if w := "protoc-gen-grpc"; !strings.Contains(cmd, w) {
+		t.Errorf("expected %q in %q", w, cmd)
+	}
 }
diff --git a/rust/testing.go b/rust/testing.go
index 42b0da1..4a1894c 100644
--- a/rust/testing.go
+++ b/rust/testing.go
@@ -132,6 +132,8 @@
 	ctx.RegisterModuleType("rust_ffi_host", RustFFIHostFactory)
 	ctx.RegisterModuleType("rust_ffi_host_shared", RustFFISharedHostFactory)
 	ctx.RegisterModuleType("rust_ffi_host_static", RustFFIStaticHostFactory)
+	ctx.RegisterModuleType("rust_grpcio", RustGrpcioFactory)
+	ctx.RegisterModuleType("rust_grpcio_host", RustGrpcioHostFactory)
 	ctx.RegisterModuleType("rust_proc_macro", ProcMacroFactory)
 	ctx.RegisterModuleType("rust_protobuf", RustProtobufFactory)
 	ctx.RegisterModuleType("rust_protobuf_host", RustProtobufHostFactory)
diff --git a/ui/build/bazel.go b/ui/build/bazel.go
index c5702c0..978553d 100644
--- a/ui/build/bazel.go
+++ b/ui/build/bazel.go
@@ -15,6 +15,8 @@
 package build
 
 import (
+	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strings"
 )
@@ -32,12 +34,6 @@
 	bazelExecutable := filepath.Join("tools", "bazel")
 	args := []string{
 		"build",
-		"--verbose_failures",
-		"--show_progress_rate_limit=0.05",
-		"--color=yes",
-		"--curses=yes",
-		"--show_timestamps",
-		"--announce_rc",
 		"--output_groups=" + outputGroups,
 		"//:" + config.TargetProduct() + "-" + config.TargetBuildVariant(),
 	}
@@ -51,4 +47,57 @@
 	cmd.Dir = filepath.Join(config.OutDir(), "..")
 	ctx.Status.Status("Starting Bazel..")
 	cmd.RunAndStreamOrFatal()
+
+	// Obtain the Bazel output directory for ninja_build.
+	infoArgs := []string{
+		"info",
+		"output_path",
+	}
+
+	infoCmd := Command(ctx, config, "bazel", bazelExecutable, infoArgs...)
+
+	infoCmd.Environment.Set("DIST_DIR", config.DistDir())
+	infoCmd.Environment.Set("SHELL", "/bin/bash")
+	infoCmd.Dir = filepath.Join(config.OutDir(), "..")
+	ctx.Status.Status("Getting Bazel Info..")
+	outputBasePath := string(infoCmd.OutputOrFatal())
+	// TODO: Don't hardcode out/ as the bazel output directory. This is
+	// currently hardcoded as ninja_build.output_root.
+	bazelNinjaBuildOutputRoot := filepath.Join(outputBasePath, "..", "out")
+
+	symlinkOutdir(ctx, config, bazelNinjaBuildOutputRoot, ".")
+}
+
+// For all files F recursively under rootPath/relativePath, creates symlinks
+// such that OutDir/F resolves to rootPath/F via symlinks.
+func symlinkOutdir(ctx Context, config Config, rootPath string, relativePath string) {
+	destDir := filepath.Join(rootPath, relativePath)
+	os.MkdirAll(destDir, 0755)
+	files, err := ioutil.ReadDir(destDir)
+	if err != nil {
+		ctx.Fatal(err)
+	}
+	for _, f := range files {
+		destPath := filepath.Join(destDir, f.Name())
+		srcPath := filepath.Join(config.OutDir(), relativePath, f.Name())
+		if statResult, err := os.Stat(srcPath); err == nil {
+			if statResult.Mode().IsDir() && f.IsDir() {
+				// Directory under OutDir already exists, so recurse on its contents.
+				symlinkOutdir(ctx, config, rootPath, filepath.Join(relativePath, f.Name()))
+			} else if !statResult.Mode().IsDir() && !f.IsDir() {
+				// File exists both in source and destination, and it's not a directory
+				// in either location. Do nothing.
+				// This can arise for files which are generated under OutDir outside of
+				// soong_build, such as .bootstrap files.
+			} else {
+				// File is a directory in one location but not the other. Raise an error.
+				ctx.Fatalf("Could not link %s to %s due to conflict", srcPath, destPath)
+			}
+		} else if os.IsNotExist(err) {
+			// Create symlink srcPath -> fullDestPath.
+			os.Symlink(destPath, srcPath)
+		} else {
+			ctx.Fatalf("Unable to stat %s: %s", srcPath, err)
+		}
+	}
 }
diff --git a/ui/build/exec.go b/ui/build/exec.go
index 053bbae..8f92269 100644
--- a/ui/build/exec.go
+++ b/ui/build/exec.go
@@ -66,8 +66,11 @@
 }
 
 func (c *Cmd) report() {
-	if c.Cmd.ProcessState != nil {
-		rusage := c.Cmd.ProcessState.SysUsage().(*syscall.Rusage)
+	if state := c.Cmd.ProcessState; state != nil {
+		if c.ctx.Metrics != nil {
+			c.ctx.Metrics.EventTracer.AddProcResInfo(c.name, state)
+		}
+		rusage := state.SysUsage().(*syscall.Rusage)
 		c.ctx.Verbosef("%q finished with exit code %d (%s real, %s user, %s system, %dMB maxrss)",
 			c.name, c.Cmd.ProcessState.ExitCode(),
 			time.Since(c.started).Round(time.Millisecond),
diff --git a/ui/build/test_build.go b/ui/build/test_build.go
index 83b3807..3164680 100644
--- a/ui/build/test_build.go
+++ b/ui/build/test_build.go
@@ -68,6 +68,12 @@
 	miniBootstrapDir := filepath.Join(outDir, "soong", ".minibootstrap")
 	modulePathsDir := filepath.Join(outDir, ".module_paths")
 	variablesFilePath := filepath.Join(outDir, "soong", "soong.variables")
+	// dexpreopt.config is an input to the soong_docs action, which runs the
+	// soong_build primary builder. However, this file is created from $(shell)
+	// invocation at Kati parse time, so it's not an explicit output of any
+	// Ninja action, but it is present during the build itself and can be
+	// treated as an source file.
+	dexpreoptConfigFilePath := filepath.Join(outDir, "soong", "dexpreopt.config")
 
 	danglingRules := make(map[string]bool)
 
@@ -81,7 +87,8 @@
 		if strings.HasPrefix(line, bootstrapDir) ||
 			strings.HasPrefix(line, miniBootstrapDir) ||
 			strings.HasPrefix(line, modulePathsDir) ||
-			line == variablesFilePath {
+			line == variablesFilePath ||
+			line == dexpreoptConfigFilePath {
 			// Leaf node is in one of Soong's bootstrap directories, which do not have
 			// full build rules in the primary build.ninja file.
 			continue
diff --git a/ui/metrics/event.go b/ui/metrics/event.go
index 5a62847..6becfd1 100644
--- a/ui/metrics/event.go
+++ b/ui/metrics/event.go
@@ -15,6 +15,8 @@
 package metrics
 
 import (
+	"os"
+	"syscall"
 	"time"
 
 	"android/soong/ui/metrics/metrics_proto"
@@ -31,11 +33,15 @@
 
 	// the time that the event started to occur.
 	start time.Time
+
+	// The list of process resource information that was executed
+	procResInfo []*soong_metrics_proto.ProcessResourceInfo
 }
 
 type EventTracer interface {
 	Begin(name, desc string, thread tracer.Thread)
 	End(thread tracer.Thread) soong_metrics_proto.PerfInfo
+	AddProcResInfo(string, *os.ProcessState)
 }
 
 type eventTracerImpl struct {
@@ -48,6 +54,34 @@
 	return time.Now()
 }
 
+// AddProcResInfo adds information on an executed process such as max resident set memory
+// and the number of voluntary context switches.
+func (t *eventTracerImpl) AddProcResInfo(name string, state *os.ProcessState) {
+	if len(t.activeEvents) < 1 {
+		return
+	}
+
+	rusage := state.SysUsage().(*syscall.Rusage)
+	// The implementation of the metrics system is a stacked based system. The steps of the
+	// build system in the UI layer is sequential so the Begin function is invoked when a
+	// function (or scoped code) is invoked. That is translated to a new event which is added
+	// at the end of the activeEvents array. When the invoking function is completed, End is
+	// invoked which is a pop operation from activeEvents.
+	curEvent := &t.activeEvents[len(t.activeEvents)-1]
+	curEvent.procResInfo = append(curEvent.procResInfo, &soong_metrics_proto.ProcessResourceInfo{
+		Name:             proto.String(name),
+		UserTimeMicros:   proto.Uint64(uint64(rusage.Utime.Usec)),
+		SystemTimeMicros: proto.Uint64(uint64(rusage.Stime.Usec)),
+		MinorPageFaults:  proto.Uint64(uint64(rusage.Minflt)),
+		MajorPageFaults:  proto.Uint64(uint64(rusage.Majflt)),
+		// ru_inblock and ru_oublock are measured in blocks of 512 bytes.
+		IoInputKb:                  proto.Uint64(uint64(rusage.Inblock / 2)),
+		IoOutputKb:                 proto.Uint64(uint64(rusage.Oublock / 2)),
+		VoluntaryContextSwitches:   proto.Uint64(uint64(rusage.Nvcsw)),
+		InvoluntaryContextSwitches: proto.Uint64(uint64(rusage.Nivcsw)),
+	})
+}
+
 func (t *eventTracerImpl) Begin(name, desc string, _ tracer.Thread) {
 	t.activeEvents = append(t.activeEvents, event{name: name, desc: desc, start: _now()})
 }
@@ -61,9 +95,10 @@
 	realTime := uint64(_now().Sub(lastEvent.start).Nanoseconds())
 
 	return soong_metrics_proto.PerfInfo{
-		Desc:      proto.String(lastEvent.desc),
-		Name:      proto.String(lastEvent.name),
-		StartTime: proto.Uint64(uint64(lastEvent.start.UnixNano())),
-		RealTime:  proto.Uint64(realTime),
+		Desc:                  proto.String(lastEvent.desc),
+		Name:                  proto.String(lastEvent.name),
+		StartTime:             proto.Uint64(uint64(lastEvent.start.UnixNano())),
+		RealTime:              proto.Uint64(realTime),
+		ProcessesResourceInfo: lastEvent.procResInfo,
 	}
 }