java/platform_bootclasspath.go - platform/build/soong - Git at Google

 // 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 java

 import (
 	"fmt"

 	"android/soong/android"
 	"android/soong/dexpreopt"
 )

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

 func registerPlatformBootclasspathBuildComponents(ctx android.RegistrationContext) {
 	ctx.RegisterSingletonModuleType("platform_bootclasspath", platformBootclasspathFactory)
 }

 // The tags used for the dependencies between the platform bootclasspath and any configured boot
 // jars.
 var (
 	platformBootclasspathArtBootJarDepTag  = bootclasspathDependencyTag{name: "art-boot-jar"}
 	platformBootclasspathBootJarDepTag     = bootclasspathDependencyTag{name: "platform-boot-jar"}
 	platformBootclasspathApexBootJarDepTag = bootclasspathDependencyTag{name: "apex-boot-jar"}
 )

 type platformBootclasspathModule struct {
 	android.SingletonModuleBase
 	ClasspathFragmentBase

 	properties platformBootclasspathProperties

 	// The apex:module pairs obtained from the configured modules.
 	configuredModules []android.Module

 	// The apex:module pairs obtained from the fragments.
 	fragments []android.Module

 	// Path to the monolithic hiddenapi-flags.csv file.
 	hiddenAPIFlagsCSV android.OutputPath

 	// Path to the monolithic hiddenapi-index.csv file.
 	hiddenAPIIndexCSV android.OutputPath

 	// Path to the monolithic hiddenapi-unsupported.csv file.
 	hiddenAPIMetadataCSV android.OutputPath
 }

 type platformBootclasspathProperties struct {
 	BootclasspathFragmentsDepsProperties

 	HiddenAPIFlagFileProperties
 }

 func platformBootclasspathFactory() android.SingletonModule {
 	m := &platformBootclasspathModule{}
 	m.AddProperties(&m.properties)
 	initClasspathFragment(m, BOOTCLASSPATH)
 	android.InitAndroidArchModule(m, android.DeviceSupported, android.MultilibCommon)
 	return m
 }

 var _ android.OutputFileProducer = (*platformBootclasspathModule)(nil)

 func (b *platformBootclasspathModule) AndroidMkEntries() (entries []android.AndroidMkEntries) {
 	entries = append(entries, android.AndroidMkEntries{
 		Class: "FAKE",
 		// Need at least one output file in order for this to take effect.
 		OutputFile: android.OptionalPathForPath(b.hiddenAPIFlagsCSV),
 		Include:    "$(BUILD_PHONY_PACKAGE)",
 	})
 	entries = append(entries, b.classpathFragmentBase().androidMkEntries()...)
 	return
 }

 // Make the hidden API files available from the platform-bootclasspath module.
 func (b *platformBootclasspathModule) OutputFiles(tag string) (android.Paths, error) {
 	switch tag {
 	case "hiddenapi-flags.csv":
 		return android.Paths{b.hiddenAPIFlagsCSV}, nil
 	case "hiddenapi-index.csv":
 		return android.Paths{b.hiddenAPIIndexCSV}, nil
 	case "hiddenapi-metadata.csv":
 		return android.Paths{b.hiddenAPIMetadataCSV}, nil
 	}

 	return nil, fmt.Errorf("unknown tag %s", tag)
 }

 func (b *platformBootclasspathModule) DepsMutator(ctx android.BottomUpMutatorContext) {
 	b.hiddenAPIDepsMutator(ctx)

 	if SkipDexpreoptBootJars(ctx) {
 		return
 	}

 	// Add a dependency onto the dex2oat tool which is needed for creating the boot image. The
 	// path is retrieved from the dependency by GetGlobalSoongConfig(ctx).
 	dexpreopt.RegisterToolDeps(ctx)
 }

 func (b *platformBootclasspathModule) hiddenAPIDepsMutator(ctx android.BottomUpMutatorContext) {
 	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
 		return
 	}

 	// Add dependencies onto the stub lib modules.
 	apiLevelToStubLibModules := hiddenAPIComputeMonolithicStubLibModules(ctx.Config())
 	hiddenAPIAddStubLibDependencies(ctx, apiLevelToStubLibModules)
 }

 func (b *platformBootclasspathModule) BootclasspathDepsMutator(ctx android.BottomUpMutatorContext) {
 	// Add dependencies on all the modules configured in the "art" boot image.
 	artImageConfig := genBootImageConfigs(ctx)[artBootImageName]
 	addDependenciesOntoBootImageModules(ctx, artImageConfig.modules, platformBootclasspathArtBootJarDepTag)

 	// Add dependencies on all the non-updatable module configured in the "boot" boot image. That does
 	// not include modules configured in the "art" boot image.
 	bootImageConfig := b.getImageConfig(ctx)
 	addDependenciesOntoBootImageModules(ctx, bootImageConfig.modules, platformBootclasspathBootJarDepTag)

 	// Add dependencies on all the apex jars.
 	apexJars := dexpreopt.GetGlobalConfig(ctx).ApexBootJars
 	addDependenciesOntoBootImageModules(ctx, apexJars, platformBootclasspathApexBootJarDepTag)

 	// Add dependencies on all the fragments.
 	b.properties.BootclasspathFragmentsDepsProperties.addDependenciesOntoFragments(ctx)
 }

 func addDependenciesOntoBootImageModules(ctx android.BottomUpMutatorContext, modules android.ConfiguredJarList, tag bootclasspathDependencyTag) {
 	for i := 0; i < modules.Len(); i++ {
 		apex := modules.Apex(i)
 		name := modules.Jar(i)

 		addDependencyOntoApexModulePair(ctx, apex, name, tag)
 	}
 }

 // GenerateSingletonBuildActions does nothing and must never do anything.
 //
 // This module only implements android.SingletonModule so that it can implement
 // android.SingletonMakeVarsProvider.
 func (b *platformBootclasspathModule) GenerateSingletonBuildActions(android.SingletonContext) {
 	// Keep empty
 }

 func (d *platformBootclasspathModule) MakeVars(ctx android.MakeVarsContext) {
 	d.generateHiddenApiMakeVars(ctx)
 }

 func (b *platformBootclasspathModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	// Gather all the dependencies from the art, platform, and apex boot jars.
 	artModules := gatherApexModulePairDepsWithTag(ctx, platformBootclasspathArtBootJarDepTag)
 	platformModules := gatherApexModulePairDepsWithTag(ctx, platformBootclasspathBootJarDepTag)
 	apexModules := gatherApexModulePairDepsWithTag(ctx, platformBootclasspathApexBootJarDepTag)

 	// Concatenate them all, in order as they would appear on the bootclasspath.
 	var allModules []android.Module
 	allModules = append(allModules, artModules...)
 	allModules = append(allModules, platformModules...)
 	allModules = append(allModules, apexModules...)
 	b.configuredModules = allModules

 	// Gather all the fragments dependencies.
 	b.fragments = gatherApexModulePairDepsWithTag(ctx, bootclasspathFragmentDepTag)

 	// Check the configuration of the boot modules.
 	// ART modules are checked by the art-bootclasspath-fragment.
 	b.checkPlatformModules(ctx, platformModules)
 	b.checkApexModules(ctx, apexModules)

 	b.generateClasspathProtoBuildActions(ctx)

 	bootDexJarByModule := b.generateHiddenAPIBuildActions(ctx, b.configuredModules, b.fragments)
 	buildRuleForBootJarsPackageCheck(ctx, bootDexJarByModule)

 	// Nothing to do if skipping the dexpreopt of boot image jars.
 	if SkipDexpreoptBootJars(ctx) {
 		return
 	}

 	b.generateBootImageBuildActions(ctx, platformModules, apexModules)
 }

 // Generate classpaths.proto config
 func (b *platformBootclasspathModule) generateClasspathProtoBuildActions(ctx android.ModuleContext) {
 	configuredJars := b.configuredJars(ctx)
 	// ART and platform boot jars must have a corresponding entry in DEX2OATBOOTCLASSPATH
 	classpathJars := configuredJarListToClasspathJars(ctx, configuredJars, BOOTCLASSPATH, DEX2OATBOOTCLASSPATH)
 	b.classpathFragmentBase().generateClasspathProtoBuildActions(ctx, configuredJars, classpathJars)
 }

 func (b *platformBootclasspathModule) configuredJars(ctx android.ModuleContext) android.ConfiguredJarList {
 	// Include all non APEX jars
 	jars := b.getImageConfig(ctx).modules

 	// Include jars from APEXes that don't populate their classpath proto config.
 	remainingJars := dexpreopt.GetGlobalConfig(ctx).ApexBootJars
 	for _, fragment := range b.fragments {
 		info := ctx.OtherModuleProvider(fragment, ClasspathFragmentProtoContentInfoProvider).(ClasspathFragmentProtoContentInfo)
 		if info.ClasspathFragmentProtoGenerated {
 			remainingJars = remainingJars.RemoveList(info.ClasspathFragmentProtoContents)
 		}
 	}
 	for i := 0; i < remainingJars.Len(); i++ {
 		jars = jars.Append(remainingJars.Apex(i), remainingJars.Jar(i))
 	}

 	return jars
 }

 // checkPlatformModules ensures that the non-updatable modules supplied are not part of an
 // apex module.
 func (b *platformBootclasspathModule) checkPlatformModules(ctx android.ModuleContext, modules []android.Module) {
 	// TODO(satayev): change this check to only allow core-icu4j, all apex jars should not be here.
 	for _, m := range modules {
 		apexInfo := ctx.OtherModuleProvider(m, android.ApexInfoProvider).(android.ApexInfo)
 		fromUpdatableApex := apexInfo.Updatable
 		if fromUpdatableApex {
 			// error: this jar is part of an updatable apex
 			ctx.ModuleErrorf("module %q from updatable apexes %q is not allowed in the framework boot image", ctx.OtherModuleName(m), apexInfo.InApexVariants)
 		} else {
 			// ok: this jar is part of the platform or a non-updatable apex
 		}
 	}
 }

 // checkApexModules ensures that the apex modules supplied are not from the platform.
 func (b *platformBootclasspathModule) checkApexModules(ctx android.ModuleContext, modules []android.Module) {
 	for _, m := range modules {
 		apexInfo := ctx.OtherModuleProvider(m, android.ApexInfoProvider).(android.ApexInfo)
 		fromUpdatableApex := apexInfo.Updatable
 		if fromUpdatableApex {
 			// ok: this jar is part of an updatable apex
 		} else {
 			name := ctx.OtherModuleName(m)
 			if apexInfo.IsForPlatform() {
 				// If AlwaysUsePrebuiltSdks() returns true then it is possible that the updatable list will
 				// include platform variants of a prebuilt module due to workarounds elsewhere. In that case
 				// do not treat this as an error.
 				// TODO(b/179354495): Always treat this as an error when migration to bootclasspath_fragment
 				//  modules is complete.
 				if !ctx.Config().AlwaysUsePrebuiltSdks() {
 					// error: this jar is part of the platform
 					ctx.ModuleErrorf("module %q from platform is not allowed in the apex boot jars list", name)
 				}
 			} else {
 				// TODO(b/177892522): Treat this as an error.
 				// Cannot do that at the moment because framework-wifi and framework-tethering are in the
 				// PRODUCT_APEX_BOOT_JARS but not marked as updatable in AOSP.
 			}
 		}
 	}
 }

 func (b *platformBootclasspathModule) getImageConfig(ctx android.EarlyModuleContext) *bootImageConfig {
 	return defaultBootImageConfig(ctx)
 }

 // generateHiddenAPIBuildActions generates all the hidden API related build rules.
 func (b *platformBootclasspathModule) generateHiddenAPIBuildActions(ctx android.ModuleContext, modules []android.Module, fragments []android.Module) bootDexJarByModule {

 	// Save the paths to the monolithic files for retrieval via OutputFiles().
 	b.hiddenAPIFlagsCSV = hiddenAPISingletonPaths(ctx).flags
 	b.hiddenAPIIndexCSV = hiddenAPISingletonPaths(ctx).index
 	b.hiddenAPIMetadataCSV = hiddenAPISingletonPaths(ctx).metadata

 	bootDexJarByModule := extractBootDexJarsFromModules(ctx, modules)

 	// Don't run any hiddenapi rules if UNSAFE_DISABLE_HIDDENAPI_FLAGS=true. This is a performance
 	// optimization that can be used to reduce the incremental build time but as its name suggests it
 	// can be unsafe to use, e.g. when the changes affect anything that goes on the bootclasspath.
 	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
 		paths := android.OutputPaths{b.hiddenAPIFlagsCSV, b.hiddenAPIIndexCSV, b.hiddenAPIMetadataCSV}
 		for _, path := range paths {
 			ctx.Build(pctx, android.BuildParams{
 				Rule:   android.Touch,
 				Output: path,
 			})
 		}
 		return bootDexJarByModule
 	}

 	// Construct a list of ClasspathElement objects from the modules and fragments.
 	classpathElements := CreateClasspathElements(ctx, modules, fragments)

 	monolithicInfo := b.createAndProvideMonolithicHiddenAPIInfo(ctx, classpathElements)

 	// Extract the classes jars only from those libraries that do not have corresponding fragments as
 	// the fragments will have already provided the flags that are needed.
 	classesJars := monolithicInfo.ClassesJars

 	// Create the input to pass to buildRuleToGenerateHiddenAPIStubFlagsFile
 	input := newHiddenAPIFlagInput()

 	// Gather stub library information from the dependencies on modules provided by
 	// hiddenAPIComputeMonolithicStubLibModules.
 	input.gatherStubLibInfo(ctx, nil)

 	// Use the flag files from this module and all the fragments.
 	input.FlagFilesByCategory = monolithicInfo.FlagsFilesByCategory

 	// Generate the monolithic stub-flags.csv file.
 	stubFlags := hiddenAPISingletonPaths(ctx).stubFlags
 	buildRuleToGenerateHiddenAPIStubFlagsFile(ctx, "platform-bootclasspath-monolithic-hiddenapi-stub-flags", "monolithic hidden API stub flags", stubFlags, bootDexJarByModule.bootDexJars(), input, monolithicInfo.StubFlagSubsets)

 	// Generate the annotation-flags.csv file from all the module annotations.
 	annotationFlags := android.PathForModuleOut(ctx, "hiddenapi-monolithic", "annotation-flags-from-classes.csv")
 	buildRuleToGenerateAnnotationFlags(ctx, "intermediate hidden API flags", classesJars, stubFlags, annotationFlags)

 	// Generate the monolithic hiddenapi-flags.csv file.
 	//
 	// Use annotation flags generated directly from the classes jars as well as annotation flag files
 	// provided by prebuilts.
 	allAnnotationFlagFiles := android.Paths{annotationFlags}
 	allAnnotationFlagFiles = append(allAnnotationFlagFiles, monolithicInfo.AnnotationFlagsPaths...)
 	allFlags := hiddenAPISingletonPaths(ctx).flags
 	buildRuleToGenerateHiddenApiFlags(ctx, "hiddenAPIFlagsFile", "monolithic hidden API flags", allFlags, stubFlags, allAnnotationFlagFiles, monolithicInfo.FlagsFilesByCategory, monolithicInfo.FlagSubsets, android.OptionalPath{})

 	// Generate an intermediate monolithic hiddenapi-metadata.csv file directly from the annotations
 	// in the source code.
 	intermediateMetadataCSV := android.PathForModuleOut(ctx, "hiddenapi-monolithic", "metadata-from-classes.csv")
 	buildRuleToGenerateMetadata(ctx, "intermediate hidden API metadata", classesJars, stubFlags, intermediateMetadataCSV)

 	// Generate the monolithic hiddenapi-metadata.csv file.
 	//
 	// Use metadata files generated directly from the classes jars as well as metadata files provided
 	// by prebuilts.
 	//
 	// This has the side effect of ensuring that the output file uses | quotes just in case that is
 	// important for the tools that consume the metadata file.
 	allMetadataFlagFiles := android.Paths{intermediateMetadataCSV}
 	allMetadataFlagFiles = append(allMetadataFlagFiles, monolithicInfo.MetadataPaths...)
 	metadataCSV := hiddenAPISingletonPaths(ctx).metadata
 	b.buildRuleMergeCSV(ctx, "monolithic hidden API metadata", allMetadataFlagFiles, metadataCSV)

 	// Generate an intermediate monolithic hiddenapi-index.csv file directly from the CSV files in the
 	// classes jars.
 	intermediateIndexCSV := android.PathForModuleOut(ctx, "hiddenapi-monolithic", "index-from-classes.csv")
 	buildRuleToGenerateIndex(ctx, "intermediate hidden API index", classesJars, intermediateIndexCSV)

 	// Generate the monolithic hiddenapi-index.csv file.
 	//
 	// Use index files generated directly from the classes jars as well as index files provided
 	// by prebuilts.
 	allIndexFlagFiles := android.Paths{intermediateIndexCSV}
 	allIndexFlagFiles = append(allIndexFlagFiles, monolithicInfo.IndexPaths...)
 	indexCSV := hiddenAPISingletonPaths(ctx).index
 	b.buildRuleMergeCSV(ctx, "monolithic hidden API index", allIndexFlagFiles, indexCSV)

 	return bootDexJarByModule
 }

 // createAndProvideMonolithicHiddenAPIInfo creates a MonolithicHiddenAPIInfo and provides it for
 // testing.
 func (b *platformBootclasspathModule) createAndProvideMonolithicHiddenAPIInfo(ctx android.ModuleContext, classpathElements ClasspathElements) MonolithicHiddenAPIInfo {
 	// Create a temporary input structure in which to collate information provided directly by this
 	// module, either through properties or direct dependencies.
 	temporaryInput := newHiddenAPIFlagInput()

 	// Create paths to the flag files specified in the properties.
 	temporaryInput.extractFlagFilesFromProperties(ctx, &b.properties.HiddenAPIFlagFileProperties)

 	// Create the monolithic info, by starting with the flag files specified on this and then merging
 	// in information from all the fragment dependencies of this.
 	monolithicInfo := newMonolithicHiddenAPIInfo(ctx, temporaryInput.FlagFilesByCategory, classpathElements)

 	// Store the information for testing.
 	ctx.SetProvider(MonolithicHiddenAPIInfoProvider, monolithicInfo)
 	return monolithicInfo
 }

 func (b *platformBootclasspathModule) buildRuleMergeCSV(ctx android.ModuleContext, desc string, inputPaths android.Paths, outputPath android.WritablePath) {
 	rule := android.NewRuleBuilder(pctx, ctx)
 	rule.Command().
 		BuiltTool("merge_csv").
 		Flag("--key_field signature").
 		FlagWithOutput("--output=", outputPath).
 		Inputs(inputPaths)

 	rule.Build(desc, desc)
 }

 // generateHiddenApiMakeVars generates make variables needed by hidden API related make rules, e.g.
 // veridex and run-appcompat.
 func (b *platformBootclasspathModule) generateHiddenApiMakeVars(ctx android.MakeVarsContext) {
 	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
 		return
 	}
 	// INTERNAL_PLATFORM_HIDDENAPI_FLAGS is used by Make rules in art/ and cts/.
 	ctx.Strict("INTERNAL_PLATFORM_HIDDENAPI_FLAGS", b.hiddenAPIFlagsCSV.String())
 }

 // generateBootImageBuildActions generates ninja rules related to the boot image creation.
 func (b *platformBootclasspathModule) generateBootImageBuildActions(ctx android.ModuleContext, platformModules, apexModules []android.Module) {
 	// Force the GlobalSoongConfig to be created and cached for use by the dex_bootjars
 	// GenerateSingletonBuildActions method as it cannot create it for itself.
 	dexpreopt.GetGlobalSoongConfig(ctx)

 	imageConfig := b.getImageConfig(ctx)
 	if imageConfig == nil {
 		return
 	}

 	global := dexpreopt.GetGlobalConfig(ctx)
 	if !shouldBuildBootImages(ctx.Config(), global) {
 		return
 	}

 	// Generate the framework profile rule
 	bootFrameworkProfileRule(ctx, imageConfig)

 	// Copy platform module dex jars to their predefined locations.
 	platformBootDexJarsByModule := extractEncodedDexJarsFromModules(ctx, platformModules)
 	copyBootJarsToPredefinedLocations(ctx, platformBootDexJarsByModule, imageConfig.dexPathsByModule)

 	// Copy apex module dex jars to their predefined locations.
 	config := GetApexBootConfig(ctx)
 	apexBootDexJarsByModule := extractEncodedDexJarsFromModules(ctx, apexModules)
 	copyBootJarsToPredefinedLocations(ctx, apexBootDexJarsByModule, config.dexPathsByModule)

 	// Build a profile for the image config and then use that to build the boot image.
 	profile := bootImageProfileRule(ctx, imageConfig)

 	// Build boot image files for the android variants.
 	androidBootImageFiles := buildBootImageVariantsForAndroidOs(ctx, imageConfig, profile)

 	// Zip the android variant boot image files up.
 	buildBootImageZipInPredefinedLocation(ctx, imageConfig, androidBootImageFiles.byArch)

 	// Build boot image files for the host variants. There are use directly by ART host side tests.
 	buildBootImageVariantsForBuildOs(ctx, imageConfig, profile)

 	dumpOatRules(ctx, imageConfig)
 }
	// 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 java

	import (
	"fmt"

	"android/soong/android"
	"android/soong/dexpreopt"
	)

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

	func registerPlatformBootclasspathBuildComponents(ctx android.RegistrationContext) {
	ctx.RegisterSingletonModuleType("platform_bootclasspath", platformBootclasspathFactory)
	}

	// The tags used for the dependencies between the platform bootclasspath and any configured boot
	// jars.
	var (
	platformBootclasspathArtBootJarDepTag = bootclasspathDependencyTag{name: "art-boot-jar"}
	platformBootclasspathBootJarDepTag = bootclasspathDependencyTag{name: "platform-boot-jar"}
	platformBootclasspathApexBootJarDepTag = bootclasspathDependencyTag{name: "apex-boot-jar"}
	)

	type platformBootclasspathModule struct {
	android.SingletonModuleBase
	ClasspathFragmentBase

	properties platformBootclasspathProperties

	// The apex:module pairs obtained from the configured modules.
	configuredModules []android.Module

	// The apex:module pairs obtained from the fragments.
	fragments []android.Module

	// Path to the monolithic hiddenapi-flags.csv file.
	hiddenAPIFlagsCSV android.OutputPath

	// Path to the monolithic hiddenapi-index.csv file.
	hiddenAPIIndexCSV android.OutputPath

	// Path to the monolithic hiddenapi-unsupported.csv file.
	hiddenAPIMetadataCSV android.OutputPath
	}

	type platformBootclasspathProperties struct {
	BootclasspathFragmentsDepsProperties

	HiddenAPIFlagFileProperties
	}

	func platformBootclasspathFactory() android.SingletonModule {
	m := &platformBootclasspathModule{}
	m.AddProperties(&m.properties)
	initClasspathFragment(m, BOOTCLASSPATH)
	android.InitAndroidArchModule(m, android.DeviceSupported, android.MultilibCommon)
	return m
	}

	var _ android.OutputFileProducer = (*platformBootclasspathModule)(nil)

	func (b *platformBootclasspathModule) AndroidMkEntries() (entries []android.AndroidMkEntries) {
	entries = append(entries, android.AndroidMkEntries{
	Class: "FAKE",
	// Need at least one output file in order for this to take effect.
	OutputFile: android.OptionalPathForPath(b.hiddenAPIFlagsCSV),
	Include: "$(BUILD_PHONY_PACKAGE)",
	})
	entries = append(entries, b.classpathFragmentBase().androidMkEntries()...)
	return
	}

	// Make the hidden API files available from the platform-bootclasspath module.
	func (b *platformBootclasspathModule) OutputFiles(tag string) (android.Paths, error) {
	switch tag {
	case "hiddenapi-flags.csv":
	return android.Paths{b.hiddenAPIFlagsCSV}, nil
	case "hiddenapi-index.csv":
	return android.Paths{b.hiddenAPIIndexCSV}, nil
	case "hiddenapi-metadata.csv":
	return android.Paths{b.hiddenAPIMetadataCSV}, nil
	}

	return nil, fmt.Errorf("unknown tag %s", tag)
	}

	func (b *platformBootclasspathModule) DepsMutator(ctx android.BottomUpMutatorContext) {
	b.hiddenAPIDepsMutator(ctx)

	if SkipDexpreoptBootJars(ctx) {
	return
	}

	// Add a dependency onto the dex2oat tool which is needed for creating the boot image. The
	// path is retrieved from the dependency by GetGlobalSoongConfig(ctx).
	dexpreopt.RegisterToolDeps(ctx)
	}

	func (b *platformBootclasspathModule) hiddenAPIDepsMutator(ctx android.BottomUpMutatorContext) {
	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
	return
	}

	// Add dependencies onto the stub lib modules.
	apiLevelToStubLibModules := hiddenAPIComputeMonolithicStubLibModules(ctx.Config())
	hiddenAPIAddStubLibDependencies(ctx, apiLevelToStubLibModules)
	}

	func (b *platformBootclasspathModule) BootclasspathDepsMutator(ctx android.BottomUpMutatorContext) {
	// Add dependencies on all the modules configured in the "art" boot image.
	artImageConfig := genBootImageConfigs(ctx)[artBootImageName]
	addDependenciesOntoBootImageModules(ctx, artImageConfig.modules, platformBootclasspathArtBootJarDepTag)

	// Add dependencies on all the non-updatable module configured in the "boot" boot image. That does
	// not include modules configured in the "art" boot image.
	bootImageConfig := b.getImageConfig(ctx)
	addDependenciesOntoBootImageModules(ctx, bootImageConfig.modules, platformBootclasspathBootJarDepTag)

	// Add dependencies on all the apex jars.
	apexJars := dexpreopt.GetGlobalConfig(ctx).ApexBootJars
	addDependenciesOntoBootImageModules(ctx, apexJars, platformBootclasspathApexBootJarDepTag)

	// Add dependencies on all the fragments.
	b.properties.BootclasspathFragmentsDepsProperties.addDependenciesOntoFragments(ctx)
	}

	func addDependenciesOntoBootImageModules(ctx android.BottomUpMutatorContext, modules android.ConfiguredJarList, tag bootclasspathDependencyTag) {
	for i := 0; i < modules.Len(); i++ {
	apex := modules.Apex(i)
	name := modules.Jar(i)

	addDependencyOntoApexModulePair(ctx, apex, name, tag)
	}
	}

	// GenerateSingletonBuildActions does nothing and must never do anything.
	//
	// This module only implements android.SingletonModule so that it can implement
	// android.SingletonMakeVarsProvider.
	func (b *platformBootclasspathModule) GenerateSingletonBuildActions(android.SingletonContext) {
	// Keep empty
	}

	func (d *platformBootclasspathModule) MakeVars(ctx android.MakeVarsContext) {
	d.generateHiddenApiMakeVars(ctx)
	}

	func (b *platformBootclasspathModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	// Gather all the dependencies from the art, platform, and apex boot jars.
	artModules := gatherApexModulePairDepsWithTag(ctx, platformBootclasspathArtBootJarDepTag)
	platformModules := gatherApexModulePairDepsWithTag(ctx, platformBootclasspathBootJarDepTag)
	apexModules := gatherApexModulePairDepsWithTag(ctx, platformBootclasspathApexBootJarDepTag)

	// Concatenate them all, in order as they would appear on the bootclasspath.
	var allModules []android.Module
	allModules = append(allModules, artModules...)
	allModules = append(allModules, platformModules...)
	allModules = append(allModules, apexModules...)
	b.configuredModules = allModules

	// Gather all the fragments dependencies.
	b.fragments = gatherApexModulePairDepsWithTag(ctx, bootclasspathFragmentDepTag)

	// Check the configuration of the boot modules.
	// ART modules are checked by the art-bootclasspath-fragment.
	b.checkPlatformModules(ctx, platformModules)
	b.checkApexModules(ctx, apexModules)

	b.generateClasspathProtoBuildActions(ctx)

	bootDexJarByModule := b.generateHiddenAPIBuildActions(ctx, b.configuredModules, b.fragments)
	buildRuleForBootJarsPackageCheck(ctx, bootDexJarByModule)

	// Nothing to do if skipping the dexpreopt of boot image jars.
	if SkipDexpreoptBootJars(ctx) {
	return
	}

	b.generateBootImageBuildActions(ctx, platformModules, apexModules)
	}

	// Generate classpaths.proto config
	func (b *platformBootclasspathModule) generateClasspathProtoBuildActions(ctx android.ModuleContext) {
	configuredJars := b.configuredJars(ctx)
	// ART and platform boot jars must have a corresponding entry in DEX2OATBOOTCLASSPATH
	classpathJars := configuredJarListToClasspathJars(ctx, configuredJars, BOOTCLASSPATH, DEX2OATBOOTCLASSPATH)
	b.classpathFragmentBase().generateClasspathProtoBuildActions(ctx, configuredJars, classpathJars)
	}

	func (b *platformBootclasspathModule) configuredJars(ctx android.ModuleContext) android.ConfiguredJarList {
	// Include all non APEX jars
	jars := b.getImageConfig(ctx).modules

	// Include jars from APEXes that don't populate their classpath proto config.
	remainingJars := dexpreopt.GetGlobalConfig(ctx).ApexBootJars
	for _, fragment := range b.fragments {
	info := ctx.OtherModuleProvider(fragment, ClasspathFragmentProtoContentInfoProvider).(ClasspathFragmentProtoContentInfo)
	if info.ClasspathFragmentProtoGenerated {
	remainingJars = remainingJars.RemoveList(info.ClasspathFragmentProtoContents)
	}
	}
	for i := 0; i < remainingJars.Len(); i++ {
	jars = jars.Append(remainingJars.Apex(i), remainingJars.Jar(i))
	}

	return jars
	}

	// checkPlatformModules ensures that the non-updatable modules supplied are not part of an
	// apex module.
	func (b *platformBootclasspathModule) checkPlatformModules(ctx android.ModuleContext, modules []android.Module) {
	// TODO(satayev): change this check to only allow core-icu4j, all apex jars should not be here.
	for _, m := range modules {
	apexInfo := ctx.OtherModuleProvider(m, android.ApexInfoProvider).(android.ApexInfo)
	fromUpdatableApex := apexInfo.Updatable
	if fromUpdatableApex {
	// error: this jar is part of an updatable apex
	ctx.ModuleErrorf("module %q from updatable apexes %q is not allowed in the framework boot image", ctx.OtherModuleName(m), apexInfo.InApexVariants)
	} else {
	// ok: this jar is part of the platform or a non-updatable apex
	}
	}
	}

	// checkApexModules ensures that the apex modules supplied are not from the platform.
	func (b *platformBootclasspathModule) checkApexModules(ctx android.ModuleContext, modules []android.Module) {
	for _, m := range modules {
	apexInfo := ctx.OtherModuleProvider(m, android.ApexInfoProvider).(android.ApexInfo)
	fromUpdatableApex := apexInfo.Updatable
	if fromUpdatableApex {
	// ok: this jar is part of an updatable apex
	} else {
	name := ctx.OtherModuleName(m)
	if apexInfo.IsForPlatform() {
	// If AlwaysUsePrebuiltSdks() returns true then it is possible that the updatable list will
	// include platform variants of a prebuilt module due to workarounds elsewhere. In that case
	// do not treat this as an error.
	// TODO(b/179354495): Always treat this as an error when migration to bootclasspath_fragment
	// modules is complete.
	if !ctx.Config().AlwaysUsePrebuiltSdks() {
	// error: this jar is part of the platform
	ctx.ModuleErrorf("module %q from platform is not allowed in the apex boot jars list", name)
	}
	} else {
	// TODO(b/177892522): Treat this as an error.
	// Cannot do that at the moment because framework-wifi and framework-tethering are in the
	// PRODUCT_APEX_BOOT_JARS but not marked as updatable in AOSP.
	}
	}
	}
	}

	func (b platformBootclasspathModule) getImageConfig(ctx android.EarlyModuleContext) bootImageConfig {
	return defaultBootImageConfig(ctx)
	}

	// generateHiddenAPIBuildActions generates all the hidden API related build rules.
	func (b *platformBootclasspathModule) generateHiddenAPIBuildActions(ctx android.ModuleContext, modules []android.Module, fragments []android.Module) bootDexJarByModule {

	// Save the paths to the monolithic files for retrieval via OutputFiles().
	b.hiddenAPIFlagsCSV = hiddenAPISingletonPaths(ctx).flags
	b.hiddenAPIIndexCSV = hiddenAPISingletonPaths(ctx).index
	b.hiddenAPIMetadataCSV = hiddenAPISingletonPaths(ctx).metadata

	bootDexJarByModule := extractBootDexJarsFromModules(ctx, modules)

	// Don't run any hiddenapi rules if UNSAFE_DISABLE_HIDDENAPI_FLAGS=true. This is a performance
	// optimization that can be used to reduce the incremental build time but as its name suggests it
	// can be unsafe to use, e.g. when the changes affect anything that goes on the bootclasspath.
	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
	paths := android.OutputPaths{b.hiddenAPIFlagsCSV, b.hiddenAPIIndexCSV, b.hiddenAPIMetadataCSV}
	for _, path := range paths {
	ctx.Build(pctx, android.BuildParams{
	Rule: android.Touch,
	Output: path,
	})
	}
	return bootDexJarByModule
	}

	// Construct a list of ClasspathElement objects from the modules and fragments.
	classpathElements := CreateClasspathElements(ctx, modules, fragments)

	monolithicInfo := b.createAndProvideMonolithicHiddenAPIInfo(ctx, classpathElements)

	// Extract the classes jars only from those libraries that do not have corresponding fragments as
	// the fragments will have already provided the flags that are needed.
	classesJars := monolithicInfo.ClassesJars

	// Create the input to pass to buildRuleToGenerateHiddenAPIStubFlagsFile
	input := newHiddenAPIFlagInput()

	// Gather stub library information from the dependencies on modules provided by
	// hiddenAPIComputeMonolithicStubLibModules.
	input.gatherStubLibInfo(ctx, nil)

	// Use the flag files from this module and all the fragments.
	input.FlagFilesByCategory = monolithicInfo.FlagsFilesByCategory

	// Generate the monolithic stub-flags.csv file.
	stubFlags := hiddenAPISingletonPaths(ctx).stubFlags
	buildRuleToGenerateHiddenAPIStubFlagsFile(ctx, "platform-bootclasspath-monolithic-hiddenapi-stub-flags", "monolithic hidden API stub flags", stubFlags, bootDexJarByModule.bootDexJars(), input, monolithicInfo.StubFlagSubsets)

	// Generate the annotation-flags.csv file from all the module annotations.
	annotationFlags := android.PathForModuleOut(ctx, "hiddenapi-monolithic", "annotation-flags-from-classes.csv")
	buildRuleToGenerateAnnotationFlags(ctx, "intermediate hidden API flags", classesJars, stubFlags, annotationFlags)

	// Generate the monolithic hiddenapi-flags.csv file.
	//
	// Use annotation flags generated directly from the classes jars as well as annotation flag files
	// provided by prebuilts.
	allAnnotationFlagFiles := android.Paths{annotationFlags}
	allAnnotationFlagFiles = append(allAnnotationFlagFiles, monolithicInfo.AnnotationFlagsPaths...)
	allFlags := hiddenAPISingletonPaths(ctx).flags
	buildRuleToGenerateHiddenApiFlags(ctx, "hiddenAPIFlagsFile", "monolithic hidden API flags", allFlags, stubFlags, allAnnotationFlagFiles, monolithicInfo.FlagsFilesByCategory, monolithicInfo.FlagSubsets, android.OptionalPath{})

	// Generate an intermediate monolithic hiddenapi-metadata.csv file directly from the annotations
	// in the source code.
	intermediateMetadataCSV := android.PathForModuleOut(ctx, "hiddenapi-monolithic", "metadata-from-classes.csv")
	buildRuleToGenerateMetadata(ctx, "intermediate hidden API metadata", classesJars, stubFlags, intermediateMetadataCSV)

	// Generate the monolithic hiddenapi-metadata.csv file.
	//
	// Use metadata files generated directly from the classes jars as well as metadata files provided
	// by prebuilts.
	//
	// This has the side effect of ensuring that the output file uses \| quotes just in case that is
	// important for the tools that consume the metadata file.
	allMetadataFlagFiles := android.Paths{intermediateMetadataCSV}
	allMetadataFlagFiles = append(allMetadataFlagFiles, monolithicInfo.MetadataPaths...)
	metadataCSV := hiddenAPISingletonPaths(ctx).metadata
	b.buildRuleMergeCSV(ctx, "monolithic hidden API metadata", allMetadataFlagFiles, metadataCSV)

	// Generate an intermediate monolithic hiddenapi-index.csv file directly from the CSV files in the
	// classes jars.
	intermediateIndexCSV := android.PathForModuleOut(ctx, "hiddenapi-monolithic", "index-from-classes.csv")
	buildRuleToGenerateIndex(ctx, "intermediate hidden API index", classesJars, intermediateIndexCSV)

	// Generate the monolithic hiddenapi-index.csv file.
	//
	// Use index files generated directly from the classes jars as well as index files provided
	// by prebuilts.
	allIndexFlagFiles := android.Paths{intermediateIndexCSV}
	allIndexFlagFiles = append(allIndexFlagFiles, monolithicInfo.IndexPaths...)
	indexCSV := hiddenAPISingletonPaths(ctx).index
	b.buildRuleMergeCSV(ctx, "monolithic hidden API index", allIndexFlagFiles, indexCSV)

	return bootDexJarByModule
	}

	// createAndProvideMonolithicHiddenAPIInfo creates a MonolithicHiddenAPIInfo and provides it for
	// testing.
	func (b *platformBootclasspathModule) createAndProvideMonolithicHiddenAPIInfo(ctx android.ModuleContext, classpathElements ClasspathElements) MonolithicHiddenAPIInfo {
	// Create a temporary input structure in which to collate information provided directly by this
	// module, either through properties or direct dependencies.
	temporaryInput := newHiddenAPIFlagInput()

	// Create paths to the flag files specified in the properties.
	temporaryInput.extractFlagFilesFromProperties(ctx, &b.properties.HiddenAPIFlagFileProperties)

	// Create the monolithic info, by starting with the flag files specified on this and then merging
	// in information from all the fragment dependencies of this.
	monolithicInfo := newMonolithicHiddenAPIInfo(ctx, temporaryInput.FlagFilesByCategory, classpathElements)

	// Store the information for testing.
	ctx.SetProvider(MonolithicHiddenAPIInfoProvider, monolithicInfo)
	return monolithicInfo
	}

	func (b *platformBootclasspathModule) buildRuleMergeCSV(ctx android.ModuleContext, desc string, inputPaths android.Paths, outputPath android.WritablePath) {
	rule := android.NewRuleBuilder(pctx, ctx)
	rule.Command().
	BuiltTool("merge_csv").
	Flag("--key_field signature").
	FlagWithOutput("--output=", outputPath).
	Inputs(inputPaths)

	rule.Build(desc, desc)
	}

	// generateHiddenApiMakeVars generates make variables needed by hidden API related make rules, e.g.
	// veridex and run-appcompat.
	func (b *platformBootclasspathModule) generateHiddenApiMakeVars(ctx android.MakeVarsContext) {
	if ctx.Config().IsEnvTrue("UNSAFE_DISABLE_HIDDENAPI_FLAGS") {
	return
	}
	// INTERNAL_PLATFORM_HIDDENAPI_FLAGS is used by Make rules in art/ and cts/.
	ctx.Strict("INTERNAL_PLATFORM_HIDDENAPI_FLAGS", b.hiddenAPIFlagsCSV.String())
	}

	// generateBootImageBuildActions generates ninja rules related to the boot image creation.
	func (b *platformBootclasspathModule) generateBootImageBuildActions(ctx android.ModuleContext, platformModules, apexModules []android.Module) {
	// Force the GlobalSoongConfig to be created and cached for use by the dex_bootjars
	// GenerateSingletonBuildActions method as it cannot create it for itself.
	dexpreopt.GetGlobalSoongConfig(ctx)

	imageConfig := b.getImageConfig(ctx)
	if imageConfig == nil {
	return
	}

	global := dexpreopt.GetGlobalConfig(ctx)
	if !shouldBuildBootImages(ctx.Config(), global) {
	return
	}

	// Generate the framework profile rule
	bootFrameworkProfileRule(ctx, imageConfig)

	// Copy platform module dex jars to their predefined locations.
	platformBootDexJarsByModule := extractEncodedDexJarsFromModules(ctx, platformModules)
	copyBootJarsToPredefinedLocations(ctx, platformBootDexJarsByModule, imageConfig.dexPathsByModule)

	// Copy apex module dex jars to their predefined locations.
	config := GetApexBootConfig(ctx)
	apexBootDexJarsByModule := extractEncodedDexJarsFromModules(ctx, apexModules)
	copyBootJarsToPredefinedLocations(ctx, apexBootDexJarsByModule, config.dexPathsByModule)

	// Build a profile for the image config and then use that to build the boot image.
	profile := bootImageProfileRule(ctx, imageConfig)

	// Build boot image files for the android variants.
	androidBootImageFiles := buildBootImageVariantsForAndroidOs(ctx, imageConfig, profile)

	// Zip the android variant boot image files up.
	buildBootImageZipInPredefinedLocation(ctx, imageConfig, androidBootImageFiles.byArch)

	// Build boot image files for the host variants. There are use directly by ART host side tests.
	buildBootImageVariantsForBuildOs(ctx, imageConfig, profile)

	dumpOatRules(ctx, imageConfig)
	}