cc/library_stub.go - SHIFTPHONES/android_build_soong - Gitiles

 // 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 cc

 import (
 	"regexp"
 	"strings"

 	"android/soong/android"
 	"android/soong/multitree"
 )

 var (
 	ndkVariantRegex  = regexp.MustCompile("ndk\\.([a-zA-Z0-9]+)")
 	stubVariantRegex = regexp.MustCompile("apex\\.([a-zA-Z0-9]+)")
 )

 func init() {
 	RegisterLibraryStubBuildComponents(android.InitRegistrationContext)
 }

 func RegisterLibraryStubBuildComponents(ctx android.RegistrationContext) {
 	ctx.RegisterModuleType("cc_api_library", CcApiLibraryFactory)
 	ctx.RegisterModuleType("cc_api_headers", CcApiHeadersFactory)
 	ctx.RegisterModuleType("cc_api_variant", CcApiVariantFactory)
 }

 func updateImportedLibraryDependency(ctx android.BottomUpMutatorContext) {
 	m, ok := ctx.Module().(*Module)
 	if !ok {
 		return
 	}

 	apiLibrary, ok := m.linker.(*apiLibraryDecorator)
 	if !ok {
 		return
 	}

 	if m.UseVndk() && apiLibrary.hasLLNDKStubs() {
 		// Add LLNDK variant dependency
 		if inList("llndk", apiLibrary.properties.Variants) {
 			variantName := BuildApiVariantName(m.BaseModuleName(), "llndk", "")
 			ctx.AddDependency(m, nil, variantName)
 		}
 	} else if m.IsSdkVariant() {
 		// Add NDK variant dependencies
 		targetVariant := "ndk." + m.StubsVersion()
 		if inList(targetVariant, apiLibrary.properties.Variants) {
 			variantName := BuildApiVariantName(m.BaseModuleName(), targetVariant, "")
 			ctx.AddDependency(m, nil, variantName)
 		}
 	} else if m.IsStubs() {
 		targetVariant := "apex." + m.StubsVersion()
 		if inList(targetVariant, apiLibrary.properties.Variants) {
 			variantName := BuildApiVariantName(m.BaseModuleName(), targetVariant, "")
 			ctx.AddDependency(m, nil, variantName)
 		}
 	}
 }

 // 'cc_api_library' is a module type which is from the exported API surface
 // with C shared library type. The module will replace original module, and
 // offer a link to the module that generates shared library object from the
 // map file.
 type apiLibraryProperties struct {
 	Src      *string `android:"arch_variant"`
 	Variants []string
 }

 type apiLibraryDecorator struct {
 	*libraryDecorator
 	properties apiLibraryProperties
 }

 func CcApiLibraryFactory() android.Module {
 	module, decorator := NewLibrary(android.DeviceSupported)
 	apiLibraryDecorator := &apiLibraryDecorator{
 		libraryDecorator: decorator,
 	}
 	apiLibraryDecorator.BuildOnlyShared()

 	module.stl = nil
 	module.sanitize = nil
 	decorator.disableStripping()

 	module.compiler = nil
 	module.linker = apiLibraryDecorator
 	module.installer = nil
 	module.library = apiLibraryDecorator
 	module.AddProperties(&module.Properties, &apiLibraryDecorator.properties)

 	// Prevent default system libs (libc, libm, and libdl) from being linked
 	if apiLibraryDecorator.baseLinker.Properties.System_shared_libs == nil {
 		apiLibraryDecorator.baseLinker.Properties.System_shared_libs = []string{}
 	}

 	apiLibraryDecorator.baseLinker.Properties.No_libcrt = BoolPtr(true)
 	apiLibraryDecorator.baseLinker.Properties.Nocrt = BoolPtr(true)

 	module.Init()

 	return module
 }

 func (d *apiLibraryDecorator) Name(basename string) string {
 	return basename + multitree.GetApiImportSuffix()
 }

 // Export include dirs without checking for existence.
 // The directories are not guaranteed to exist during Soong analysis.
 func (d *apiLibraryDecorator) exportIncludes(ctx ModuleContext) {
 	exporterProps := d.flagExporter.Properties
 	for _, dir := range exporterProps.Export_include_dirs {
 		d.dirs = append(d.dirs, android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), dir))
 	}
 	// system headers
 	for _, dir := range exporterProps.Export_system_include_dirs {
 		d.systemDirs = append(d.systemDirs, android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), dir))
 	}
 }

 func (d *apiLibraryDecorator) linkerInit(ctx BaseModuleContext) {
 	d.baseLinker.linkerInit(ctx)

 	if d.hasNDKStubs() {
 		// Set SDK version of module as current
 		ctx.Module().(*Module).Properties.Sdk_version = StringPtr("current")

 		// Add NDK stub as NDK known libs
 		name := ctx.ModuleName()

 		ndkKnownLibsLock.Lock()
 		ndkKnownLibs := getNDKKnownLibs(ctx.Config())
 		if !inList(name, *ndkKnownLibs) {
 			*ndkKnownLibs = append(*ndkKnownLibs, name)
 		}
 		ndkKnownLibsLock.Unlock()
 	}
 }

 func (d *apiLibraryDecorator) link(ctx ModuleContext, flags Flags, deps PathDeps, objects Objects) android.Path {
 	m, _ := ctx.Module().(*Module)

 	var in android.Path

 	// src might not exist during the beginning of soong analysis in Multi-tree
 	if src := String(d.properties.Src); src != "" {
 		in = android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), src)
 	}

 	libName := m.BaseModuleName() + multitree.GetApiImportSuffix()

 	load_cc_variant := func(apiVariantModule string) {
 		var mod android.Module

 		ctx.VisitDirectDeps(func(depMod android.Module) {
 			if depMod.Name() == apiVariantModule {
 				mod = depMod
 				libName = apiVariantModule
 			}
 		})

 		if mod != nil {
 			variantMod, ok := mod.(*CcApiVariant)
 			if ok {
 				in = variantMod.Src()

 				// Copy LLDNK properties to cc_api_library module
 				d.libraryDecorator.flagExporter.Properties.Export_include_dirs = append(
 					d.libraryDecorator.flagExporter.Properties.Export_include_dirs,
 					variantMod.exportProperties.Export_include_dirs...)

 				// Export headers as system include dirs if specified. Mostly for libc
 				if Bool(variantMod.exportProperties.Export_headers_as_system) {
 					d.libraryDecorator.flagExporter.Properties.Export_system_include_dirs = append(
 						d.libraryDecorator.flagExporter.Properties.Export_system_include_dirs,
 						d.libraryDecorator.flagExporter.Properties.Export_include_dirs...)
 					d.libraryDecorator.flagExporter.Properties.Export_include_dirs = nil
 				}
 			}
 		}
 	}

 	if m.UseVndk() && d.hasLLNDKStubs() {
 		// LLNDK variant
 		load_cc_variant(BuildApiVariantName(m.BaseModuleName(), "llndk", ""))
 	} else if m.IsSdkVariant() {
 		// NDK Variant
 		load_cc_variant(BuildApiVariantName(m.BaseModuleName(), "ndk", m.StubsVersion()))
 	} else if m.IsStubs() {
 		// APEX Variant
 		load_cc_variant(BuildApiVariantName(m.BaseModuleName(), "apex", m.StubsVersion()))
 	}

 	// Flags reexported from dependencies. (e.g. vndk_prebuilt_shared)
 	d.exportIncludes(ctx)
 	d.libraryDecorator.reexportDirs(deps.ReexportedDirs...)
 	d.libraryDecorator.reexportSystemDirs(deps.ReexportedSystemDirs...)
 	d.libraryDecorator.reexportFlags(deps.ReexportedFlags...)
 	d.libraryDecorator.reexportDeps(deps.ReexportedDeps...)
 	d.libraryDecorator.addExportedGeneratedHeaders(deps.ReexportedGeneratedHeaders...)

 	if in == nil {
 		ctx.PropertyErrorf("src", "Unable to locate source property")
 		return nil
 	}

 	// Make the _compilation_ of rdeps have an order-only dep on cc_api_library.src (an .so file)
 	// The .so file itself has an order-only dependency on the headers contributed by this library.
 	// Creating this dependency ensures that the headers are assembled before compilation of rdeps begins.
 	d.libraryDecorator.reexportDeps(in)
 	d.libraryDecorator.flagExporter.setProvider(ctx)

 	d.unstrippedOutputFile = in
 	libName += flags.Toolchain.ShlibSuffix()

 	tocFile := android.PathForModuleOut(ctx, libName+".toc")
 	d.tocFile = android.OptionalPathForPath(tocFile)
 	TransformSharedObjectToToc(ctx, in, tocFile)

 	outputFile := android.PathForModuleOut(ctx, libName)

 	// TODO(b/270485584) This copies with a new name, just to avoid conflict with prebuilts.
 	// We can just use original input if there is any way to avoid name conflict without copy.
 	ctx.Build(pctx, android.BuildParams{
 		Rule:        android.Cp,
 		Description: "API surface imported library",
 		Input:       in,
 		Output:      outputFile,
 		Args: map[string]string{
 			"cpFlags": "-L",
 		},
 	})

 	ctx.SetProvider(SharedLibraryInfoProvider, SharedLibraryInfo{
 		SharedLibrary: outputFile,
 		Target:        ctx.Target(),

 		TableOfContents: d.tocFile,
 	})

 	d.shareStubs(ctx)

 	return outputFile
 }

 // Share additional information about stub libraries with provider
 func (d *apiLibraryDecorator) shareStubs(ctx ModuleContext) {
 	stubs := ctx.GetDirectDepsWithTag(stubImplDepTag)
 	if len(stubs) > 0 {
 		var stubsInfo []SharedStubLibrary
 		for _, stub := range stubs {
 			stubInfo := ctx.OtherModuleProvider(stub, SharedLibraryInfoProvider).(SharedLibraryInfo)
 			flagInfo := ctx.OtherModuleProvider(stub, FlagExporterInfoProvider).(FlagExporterInfo)
 			stubsInfo = append(stubsInfo, SharedStubLibrary{
 				Version:           moduleLibraryInterface(stub).stubsVersion(),
 				SharedLibraryInfo: stubInfo,
 				FlagExporterInfo:  flagInfo,
 			})
 		}
 		ctx.SetProvider(SharedLibraryStubsProvider, SharedLibraryStubsInfo{
 			SharedStubLibraries: stubsInfo,

 			IsLLNDK: ctx.IsLlndk(),
 		})
 	}
 }

 func (d *apiLibraryDecorator) availableFor(what string) bool {
 	// Stub from API surface should be available for any APEX.
 	return true
 }

 func (d *apiLibraryDecorator) hasApexStubs() bool {
 	for _, variant := range d.properties.Variants {
 		if strings.HasPrefix(variant, "apex") {
 			return true
 		}
 	}
 	return false
 }

 func (d *apiLibraryDecorator) hasStubsVariants() bool {
 	return d.hasApexStubs()
 }

 func (d *apiLibraryDecorator) stubsVersions(ctx android.BaseMutatorContext) []string {
 	m, ok := ctx.Module().(*Module)

 	if !ok {
 		return nil
 	}

 	// TODO(b/244244438) Create more version information for NDK and APEX variations
 	// NDK variants
 	if m.IsSdkVariant() {
 		// TODO(b/249193999) Do not check if module has NDK stubs once all NDK cc_api_library contains ndk variant of cc_api_variant.
 		if d.hasNDKStubs() {
 			return d.getNdkVersions()
 		}
 	}

 	if d.hasLLNDKStubs() && m.UseVndk() {
 		// LLNDK libraries only need a single stubs variant.
 		return []string{android.FutureApiLevel.String()}
 	}

 	stubsVersions := d.getStubVersions()

 	if len(stubsVersions) != 0 {
 		return stubsVersions
 	}

 	if m.MinSdkVersion() == "" {
 		return nil
 	}

 	firstVersion, err := nativeApiLevelFromUser(ctx,
 		m.MinSdkVersion())

 	if err != nil {
 		return nil
 	}

 	return ndkLibraryVersions(ctx, firstVersion)
 }

 func (d *apiLibraryDecorator) hasLLNDKStubs() bool {
 	return inList("llndk", d.properties.Variants)
 }

 func (d *apiLibraryDecorator) hasNDKStubs() bool {
 	for _, variant := range d.properties.Variants {
 		if ndkVariantRegex.MatchString(variant) {
 			return true
 		}
 	}
 	return false
 }

 func (d *apiLibraryDecorator) getNdkVersions() []string {
 	ndkVersions := []string{}

 	for _, variant := range d.properties.Variants {
 		if match := ndkVariantRegex.FindStringSubmatch(variant); len(match) == 2 {
 			ndkVersions = append(ndkVersions, match[1])
 		}
 	}

 	return ndkVersions
 }

 func (d *apiLibraryDecorator) getStubVersions() []string {
 	stubVersions := []string{}

 	for _, variant := range d.properties.Variants {
 		if match := stubVariantRegex.FindStringSubmatch(variant); len(match) == 2 {
 			stubVersions = append(stubVersions, match[1])
 		}
 	}

 	return stubVersions
 }

 // 'cc_api_headers' is similar with 'cc_api_library', but which replaces
 // header libraries. The module will replace any dependencies to existing
 // original header libraries.
 type apiHeadersDecorator struct {
 	*libraryDecorator
 }

 func CcApiHeadersFactory() android.Module {
 	module, decorator := NewLibrary(android.DeviceSupported)
 	apiHeadersDecorator := &apiHeadersDecorator{
 		libraryDecorator: decorator,
 	}
 	apiHeadersDecorator.HeaderOnly()

 	module.stl = nil
 	module.sanitize = nil
 	decorator.disableStripping()

 	module.compiler = nil
 	module.linker = apiHeadersDecorator
 	module.installer = nil

 	// Prevent default system libs (libc, libm, and libdl) from being linked
 	if apiHeadersDecorator.baseLinker.Properties.System_shared_libs == nil {
 		apiHeadersDecorator.baseLinker.Properties.System_shared_libs = []string{}
 	}

 	apiHeadersDecorator.baseLinker.Properties.No_libcrt = BoolPtr(true)
 	apiHeadersDecorator.baseLinker.Properties.Nocrt = BoolPtr(true)

 	module.Init()

 	return module
 }

 func (d *apiHeadersDecorator) Name(basename string) string {
 	return basename + multitree.GetApiImportSuffix()
 }

 func (d *apiHeadersDecorator) availableFor(what string) bool {
 	// Stub from API surface should be available for any APEX.
 	return true
 }

 type ccApiexportProperties struct {
 	Src     *string `android:"arch_variant"`
 	Variant *string
 	Version *string
 }

 type variantExporterProperties struct {
 	// Header directory to export
 	Export_include_dirs []string `android:"arch_variant"`

 	// Export all headers as system include
 	Export_headers_as_system *bool
 }

 type CcApiVariant struct {
 	android.ModuleBase

 	properties       ccApiexportProperties
 	exportProperties variantExporterProperties

 	src android.Path
 }

 var _ android.Module = (*CcApiVariant)(nil)
 var _ android.ImageInterface = (*CcApiVariant)(nil)

 func CcApiVariantFactory() android.Module {
 	module := &CcApiVariant{}

 	module.AddProperties(&module.properties)
 	module.AddProperties(&module.exportProperties)

 	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibBoth)
 	return module
 }

 func (v *CcApiVariant) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	// No need to build

 	if String(v.properties.Src) == "" {
 		ctx.PropertyErrorf("src", "src is a required property")
 	}

 	// Skip the existence check of the stub prebuilt file.
 	// The file is not guaranteed to exist during Soong analysis.
 	// Build orchestrator will be responsible for creating a connected ninja graph.
 	v.src = android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), String(v.properties.Src))
 }

 func (v *CcApiVariant) Name() string {
 	version := String(v.properties.Version)
 	return BuildApiVariantName(v.BaseModuleName(), *v.properties.Variant, version)
 }

 func (v *CcApiVariant) Src() android.Path {
 	return v.src
 }

 func BuildApiVariantName(baseName string, variant string, version string) string {
 	names := []string{baseName, variant}
 	if version != "" {
 		names = append(names, version)
 	}

 	return strings.Join(names[:], ".") + multitree.GetApiImportSuffix()
 }

 // Implement ImageInterface to generate image variants
 func (v *CcApiVariant) ImageMutatorBegin(ctx android.BaseModuleContext) {}
 func (v *CcApiVariant) CoreVariantNeeded(ctx android.BaseModuleContext) bool {
 	return inList(String(v.properties.Variant), []string{"ndk", "apex"})
 }
 func (v *CcApiVariant) RamdiskVariantNeeded(ctx android.BaseModuleContext) bool       { return false }
 func (v *CcApiVariant) VendorRamdiskVariantNeeded(ctx android.BaseModuleContext) bool { return false }
 func (v *CcApiVariant) DebugRamdiskVariantNeeded(ctx android.BaseModuleContext) bool  { return false }
 func (v *CcApiVariant) RecoveryVariantNeeded(ctx android.BaseModuleContext) bool      { return false }
 func (v *CcApiVariant) ExtraImageVariations(ctx android.BaseModuleContext) []string {
 	var variations []string
 	platformVndkVersion := ctx.DeviceConfig().PlatformVndkVersion()

 	if String(v.properties.Variant) == "llndk" {
 		variations = append(variations, VendorVariationPrefix+platformVndkVersion)
 		variations = append(variations, ProductVariationPrefix+platformVndkVersion)
 	}

 	return variations
 }
 func (v *CcApiVariant) SetImageVariation(ctx android.BaseModuleContext, variation string, module android.Module) {
 }
	// 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 cc

	import (
	"regexp"
	"strings"

	"android/soong/android"
	"android/soong/multitree"
	)

	var (
	ndkVariantRegex = regexp.MustCompile("ndk\\.([a-zA-Z0-9]+)")
	stubVariantRegex = regexp.MustCompile("apex\\.([a-zA-Z0-9]+)")
	)

	func init() {
	RegisterLibraryStubBuildComponents(android.InitRegistrationContext)
	}

	func RegisterLibraryStubBuildComponents(ctx android.RegistrationContext) {
	ctx.RegisterModuleType("cc_api_library", CcApiLibraryFactory)
	ctx.RegisterModuleType("cc_api_headers", CcApiHeadersFactory)
	ctx.RegisterModuleType("cc_api_variant", CcApiVariantFactory)
	}

	func updateImportedLibraryDependency(ctx android.BottomUpMutatorContext) {
	m, ok := ctx.Module().(*Module)
	if !ok {
	return
	}

	apiLibrary, ok := m.linker.(*apiLibraryDecorator)
	if !ok {
	return
	}

	if m.UseVndk() && apiLibrary.hasLLNDKStubs() {
	// Add LLNDK variant dependency
	if inList("llndk", apiLibrary.properties.Variants) {
	variantName := BuildApiVariantName(m.BaseModuleName(), "llndk", "")
	ctx.AddDependency(m, nil, variantName)
	}
	} else if m.IsSdkVariant() {
	// Add NDK variant dependencies
	targetVariant := "ndk." + m.StubsVersion()
	if inList(targetVariant, apiLibrary.properties.Variants) {
	variantName := BuildApiVariantName(m.BaseModuleName(), targetVariant, "")
	ctx.AddDependency(m, nil, variantName)
	}
	} else if m.IsStubs() {
	targetVariant := "apex." + m.StubsVersion()
	if inList(targetVariant, apiLibrary.properties.Variants) {
	variantName := BuildApiVariantName(m.BaseModuleName(), targetVariant, "")
	ctx.AddDependency(m, nil, variantName)
	}
	}
	}

	// 'cc_api_library' is a module type which is from the exported API surface
	// with C shared library type. The module will replace original module, and
	// offer a link to the module that generates shared library object from the
	// map file.
	type apiLibraryProperties struct {
	Src *string `android:"arch_variant"`
	Variants []string
	}

	type apiLibraryDecorator struct {
	*libraryDecorator
	properties apiLibraryProperties
	}

	func CcApiLibraryFactory() android.Module {
	module, decorator := NewLibrary(android.DeviceSupported)
	apiLibraryDecorator := &apiLibraryDecorator{
	libraryDecorator: decorator,
	}
	apiLibraryDecorator.BuildOnlyShared()

	module.stl = nil
	module.sanitize = nil
	decorator.disableStripping()

	module.compiler = nil
	module.linker = apiLibraryDecorator
	module.installer = nil
	module.library = apiLibraryDecorator
	module.AddProperties(&module.Properties, &apiLibraryDecorator.properties)

	// Prevent default system libs (libc, libm, and libdl) from being linked
	if apiLibraryDecorator.baseLinker.Properties.System_shared_libs == nil {
	apiLibraryDecorator.baseLinker.Properties.System_shared_libs = []string{}
	}

	apiLibraryDecorator.baseLinker.Properties.No_libcrt = BoolPtr(true)
	apiLibraryDecorator.baseLinker.Properties.Nocrt = BoolPtr(true)

	module.Init()

	return module
	}

	func (d *apiLibraryDecorator) Name(basename string) string {
	return basename + multitree.GetApiImportSuffix()
	}

	// Export include dirs without checking for existence.
	// The directories are not guaranteed to exist during Soong analysis.
	func (d *apiLibraryDecorator) exportIncludes(ctx ModuleContext) {
	exporterProps := d.flagExporter.Properties
	for _, dir := range exporterProps.Export_include_dirs {
	d.dirs = append(d.dirs, android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), dir))
	}
	// system headers
	for _, dir := range exporterProps.Export_system_include_dirs {
	d.systemDirs = append(d.systemDirs, android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), dir))
	}
	}

	func (d *apiLibraryDecorator) linkerInit(ctx BaseModuleContext) {
	d.baseLinker.linkerInit(ctx)

	if d.hasNDKStubs() {
	// Set SDK version of module as current
	ctx.Module().(*Module).Properties.Sdk_version = StringPtr("current")

	// Add NDK stub as NDK known libs
	name := ctx.ModuleName()

	ndkKnownLibsLock.Lock()
	ndkKnownLibs := getNDKKnownLibs(ctx.Config())
	if !inList(name, *ndkKnownLibs) {
	ndkKnownLibs = append(ndkKnownLibs, name)
	}
	ndkKnownLibsLock.Unlock()
	}
	}

	func (d *apiLibraryDecorator) link(ctx ModuleContext, flags Flags, deps PathDeps, objects Objects) android.Path {
	m, _ := ctx.Module().(*Module)

	var in android.Path

	// src might not exist during the beginning of soong analysis in Multi-tree
	if src := String(d.properties.Src); src != "" {
	in = android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), src)
	}

	libName := m.BaseModuleName() + multitree.GetApiImportSuffix()

	load_cc_variant := func(apiVariantModule string) {
	var mod android.Module

	ctx.VisitDirectDeps(func(depMod android.Module) {
	if depMod.Name() == apiVariantModule {
	mod = depMod
	libName = apiVariantModule
	}
	})

	if mod != nil {
	variantMod, ok := mod.(*CcApiVariant)
	if ok {
	in = variantMod.Src()

	// Copy LLDNK properties to cc_api_library module
	d.libraryDecorator.flagExporter.Properties.Export_include_dirs = append(
	d.libraryDecorator.flagExporter.Properties.Export_include_dirs,
	variantMod.exportProperties.Export_include_dirs...)

	// Export headers as system include dirs if specified. Mostly for libc
	if Bool(variantMod.exportProperties.Export_headers_as_system) {
	d.libraryDecorator.flagExporter.Properties.Export_system_include_dirs = append(
	d.libraryDecorator.flagExporter.Properties.Export_system_include_dirs,
	d.libraryDecorator.flagExporter.Properties.Export_include_dirs...)
	d.libraryDecorator.flagExporter.Properties.Export_include_dirs = nil
	}
	}
	}
	}

	if m.UseVndk() && d.hasLLNDKStubs() {
	// LLNDK variant
	load_cc_variant(BuildApiVariantName(m.BaseModuleName(), "llndk", ""))
	} else if m.IsSdkVariant() {
	// NDK Variant
	load_cc_variant(BuildApiVariantName(m.BaseModuleName(), "ndk", m.StubsVersion()))
	} else if m.IsStubs() {
	// APEX Variant
	load_cc_variant(BuildApiVariantName(m.BaseModuleName(), "apex", m.StubsVersion()))
	}

	// Flags reexported from dependencies. (e.g. vndk_prebuilt_shared)
	d.exportIncludes(ctx)
	d.libraryDecorator.reexportDirs(deps.ReexportedDirs...)
	d.libraryDecorator.reexportSystemDirs(deps.ReexportedSystemDirs...)
	d.libraryDecorator.reexportFlags(deps.ReexportedFlags...)
	d.libraryDecorator.reexportDeps(deps.ReexportedDeps...)
	d.libraryDecorator.addExportedGeneratedHeaders(deps.ReexportedGeneratedHeaders...)

	if in == nil {
	ctx.PropertyErrorf("src", "Unable to locate source property")
	return nil
	}

	// Make the _compilation_ of rdeps have an order-only dep on cc_api_library.src (an .so file)
	// The .so file itself has an order-only dependency on the headers contributed by this library.
	// Creating this dependency ensures that the headers are assembled before compilation of rdeps begins.
	d.libraryDecorator.reexportDeps(in)
	d.libraryDecorator.flagExporter.setProvider(ctx)

	d.unstrippedOutputFile = in
	libName += flags.Toolchain.ShlibSuffix()

	tocFile := android.PathForModuleOut(ctx, libName+".toc")
	d.tocFile = android.OptionalPathForPath(tocFile)
	TransformSharedObjectToToc(ctx, in, tocFile)

	outputFile := android.PathForModuleOut(ctx, libName)

	// TODO(b/270485584) This copies with a new name, just to avoid conflict with prebuilts.
	// We can just use original input if there is any way to avoid name conflict without copy.
	ctx.Build(pctx, android.BuildParams{
	Rule: android.Cp,
	Description: "API surface imported library",
	Input: in,
	Output: outputFile,
	Args: map[string]string{
	"cpFlags": "-L",
	},
	})

	ctx.SetProvider(SharedLibraryInfoProvider, SharedLibraryInfo{
	SharedLibrary: outputFile,
	Target: ctx.Target(),

	TableOfContents: d.tocFile,
	})

	d.shareStubs(ctx)

	return outputFile
	}

	// Share additional information about stub libraries with provider
	func (d *apiLibraryDecorator) shareStubs(ctx ModuleContext) {
	stubs := ctx.GetDirectDepsWithTag(stubImplDepTag)
	if len(stubs) > 0 {
	var stubsInfo []SharedStubLibrary
	for _, stub := range stubs {
	stubInfo := ctx.OtherModuleProvider(stub, SharedLibraryInfoProvider).(SharedLibraryInfo)
	flagInfo := ctx.OtherModuleProvider(stub, FlagExporterInfoProvider).(FlagExporterInfo)
	stubsInfo = append(stubsInfo, SharedStubLibrary{
	Version: moduleLibraryInterface(stub).stubsVersion(),
	SharedLibraryInfo: stubInfo,
	FlagExporterInfo: flagInfo,
	})
	}
	ctx.SetProvider(SharedLibraryStubsProvider, SharedLibraryStubsInfo{
	SharedStubLibraries: stubsInfo,

	IsLLNDK: ctx.IsLlndk(),
	})
	}
	}

	func (d *apiLibraryDecorator) availableFor(what string) bool {
	// Stub from API surface should be available for any APEX.
	return true
	}

	func (d *apiLibraryDecorator) hasApexStubs() bool {
	for _, variant := range d.properties.Variants {
	if strings.HasPrefix(variant, "apex") {
	return true
	}
	}
	return false
	}

	func (d *apiLibraryDecorator) hasStubsVariants() bool {
	return d.hasApexStubs()
	}

	func (d *apiLibraryDecorator) stubsVersions(ctx android.BaseMutatorContext) []string {
	m, ok := ctx.Module().(*Module)

	if !ok {
	return nil
	}

	// TODO(b/244244438) Create more version information for NDK and APEX variations
	// NDK variants
	if m.IsSdkVariant() {
	// TODO(b/249193999) Do not check if module has NDK stubs once all NDK cc_api_library contains ndk variant of cc_api_variant.
	if d.hasNDKStubs() {
	return d.getNdkVersions()
	}
	}

	if d.hasLLNDKStubs() && m.UseVndk() {
	// LLNDK libraries only need a single stubs variant.
	return []string{android.FutureApiLevel.String()}
	}

	stubsVersions := d.getStubVersions()

	if len(stubsVersions) != 0 {
	return stubsVersions
	}

	if m.MinSdkVersion() == "" {
	return nil
	}

	firstVersion, err := nativeApiLevelFromUser(ctx,
	m.MinSdkVersion())

	if err != nil {
	return nil
	}

	return ndkLibraryVersions(ctx, firstVersion)
	}

	func (d *apiLibraryDecorator) hasLLNDKStubs() bool {
	return inList("llndk", d.properties.Variants)
	}

	func (d *apiLibraryDecorator) hasNDKStubs() bool {
	for _, variant := range d.properties.Variants {
	if ndkVariantRegex.MatchString(variant) {
	return true
	}
	}
	return false
	}

	func (d *apiLibraryDecorator) getNdkVersions() []string {
	ndkVersions := []string{}

	for _, variant := range d.properties.Variants {
	if match := ndkVariantRegex.FindStringSubmatch(variant); len(match) == 2 {
	ndkVersions = append(ndkVersions, match[1])
	}
	}

	return ndkVersions
	}

	func (d *apiLibraryDecorator) getStubVersions() []string {
	stubVersions := []string{}

	for _, variant := range d.properties.Variants {
	if match := stubVariantRegex.FindStringSubmatch(variant); len(match) == 2 {
	stubVersions = append(stubVersions, match[1])
	}
	}

	return stubVersions
	}

	// 'cc_api_headers' is similar with 'cc_api_library', but which replaces
	// header libraries. The module will replace any dependencies to existing
	// original header libraries.
	type apiHeadersDecorator struct {
	*libraryDecorator
	}

	func CcApiHeadersFactory() android.Module {
	module, decorator := NewLibrary(android.DeviceSupported)
	apiHeadersDecorator := &apiHeadersDecorator{
	libraryDecorator: decorator,
	}
	apiHeadersDecorator.HeaderOnly()

	module.stl = nil
	module.sanitize = nil
	decorator.disableStripping()

	module.compiler = nil
	module.linker = apiHeadersDecorator
	module.installer = nil

	// Prevent default system libs (libc, libm, and libdl) from being linked
	if apiHeadersDecorator.baseLinker.Properties.System_shared_libs == nil {
	apiHeadersDecorator.baseLinker.Properties.System_shared_libs = []string{}
	}

	apiHeadersDecorator.baseLinker.Properties.No_libcrt = BoolPtr(true)
	apiHeadersDecorator.baseLinker.Properties.Nocrt = BoolPtr(true)

	module.Init()

	return module
	}

	func (d *apiHeadersDecorator) Name(basename string) string {
	return basename + multitree.GetApiImportSuffix()
	}

	func (d *apiHeadersDecorator) availableFor(what string) bool {
	// Stub from API surface should be available for any APEX.
	return true
	}

	type ccApiexportProperties struct {
	Src *string `android:"arch_variant"`
	Variant *string
	Version *string
	}

	type variantExporterProperties struct {
	// Header directory to export
	Export_include_dirs []string `android:"arch_variant"`

	// Export all headers as system include
	Export_headers_as_system *bool
	}

	type CcApiVariant struct {
	android.ModuleBase

	properties ccApiexportProperties
	exportProperties variantExporterProperties

	src android.Path
	}

	var _ android.Module = (*CcApiVariant)(nil)
	var _ android.ImageInterface = (*CcApiVariant)(nil)

	func CcApiVariantFactory() android.Module {
	module := &CcApiVariant{}

	module.AddProperties(&module.properties)
	module.AddProperties(&module.exportProperties)

	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibBoth)
	return module
	}

	func (v *CcApiVariant) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	// No need to build

	if String(v.properties.Src) == "" {
	ctx.PropertyErrorf("src", "src is a required property")
	}

	// Skip the existence check of the stub prebuilt file.
	// The file is not guaranteed to exist during Soong analysis.
	// Build orchestrator will be responsible for creating a connected ninja graph.
	v.src = android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), String(v.properties.Src))
	}

	func (v *CcApiVariant) Name() string {
	version := String(v.properties.Version)
	return BuildApiVariantName(v.BaseModuleName(), *v.properties.Variant, version)
	}

	func (v *CcApiVariant) Src() android.Path {
	return v.src
	}

	func BuildApiVariantName(baseName string, variant string, version string) string {
	names := []string{baseName, variant}
	if version != "" {
	names = append(names, version)
	}

	return strings.Join(names[:], ".") + multitree.GetApiImportSuffix()
	}

	// Implement ImageInterface to generate image variants
	func (v *CcApiVariant) ImageMutatorBegin(ctx android.BaseModuleContext) {}
	func (v *CcApiVariant) CoreVariantNeeded(ctx android.BaseModuleContext) bool {
	return inList(String(v.properties.Variant), []string{"ndk", "apex"})
	}
	func (v *CcApiVariant) RamdiskVariantNeeded(ctx android.BaseModuleContext) bool { return false }
	func (v *CcApiVariant) VendorRamdiskVariantNeeded(ctx android.BaseModuleContext) bool { return false }
	func (v *CcApiVariant) DebugRamdiskVariantNeeded(ctx android.BaseModuleContext) bool { return false }
	func (v *CcApiVariant) RecoveryVariantNeeded(ctx android.BaseModuleContext) bool { return false }
	func (v *CcApiVariant) ExtraImageVariations(ctx android.BaseModuleContext) []string {
	var variations []string
	platformVndkVersion := ctx.DeviceConfig().PlatformVndkVersion()

	if String(v.properties.Variant) == "llndk" {
	variations = append(variations, VendorVariationPrefix+platformVndkVersion)
	variations = append(variations, ProductVariationPrefix+platformVndkVersion)
	}

	return variations
	}
	func (v *CcApiVariant) SetImageVariation(ctx android.BaseModuleContext, variation string, module android.Module) {
	}