java/platform_bootclasspath.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 java

 import (
 	"fmt"

 	"android/soong/android"
 	"android/soong/dexpreopt"
 	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
 )

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

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

 	ctx.FinalDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.BottomUp("platform_bootclasspath_deps", platformBootclasspathDepsMutator)
 	})
 }

 type platformBootclasspathDependencyTag struct {
 	blueprint.BaseDependencyTag

 	name string
 }

 // Avoid having to make platform bootclasspath content visible to the platform bootclasspath.
 //
 // This is a temporary workaround to make it easier to migrate to platform bootclasspath with proper
 // dependencies.
 // TODO(b/177892522): Remove this and add needed visibility.
 func (t platformBootclasspathDependencyTag) ExcludeFromVisibilityEnforcement() {
 }

 // The tag used for the dependency between the platform bootclasspath and any configured boot jars.
 var platformBootclasspathModuleDepTag = platformBootclasspathDependencyTag{name: "module"}

 // The tag used for the dependency between the platform bootclasspath and bootclasspath_fragments.
 var platformBootclasspathFragmentDepTag = platformBootclasspathDependencyTag{name: "fragment"}

 var _ android.ExcludeFromVisibilityEnforcementTag = platformBootclasspathDependencyTag{}

 type platformBootclasspathModule struct {
 	android.ModuleBase
 	ClasspathFragmentBase

 	properties platformBootclasspathProperties

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

 	// The apex:module pairs obtained from the fragments.
 	//
 	// Currently only for testing.
 	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
 }

 // ApexVariantReference specifies a particular apex variant of a module.
 type ApexVariantReference struct {
 	// The name of the module apex variant, i.e. the apex containing the module variant.
 	//
 	// If this is not specified then it defaults to "platform" which will cause a dependency to be
 	// added to the module's platform variant.
 	Apex *string

 	// The name of the module.
 	Module *string
 }

 type platformBootclasspathProperties struct {
 	// The names of the bootclasspath_fragment modules that form part of this
 	// platform_bootclasspath.
 	Fragments []ApexVariantReference

 	Hidden_api HiddenAPIFlagFileProperties
 }

 func platformBootclasspathFactory() android.Module {
 	m := &platformBootclasspathModule{}
 	m.AddProperties(&m.properties)
 	// TODO(satayev): split systemserver and apex jars into separate configs.
 	initClasspathFragment(m)
 	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().getAndroidMkEntries()...)
 	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) {
 	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 platformBootclasspathDepsMutator(ctx android.BottomUpMutatorContext) {
 	m := ctx.Module()
 	if p, ok := m.(*platformBootclasspathModule); ok {
 		// Add dependencies on all the modules configured in the "art" boot image.
 		artImageConfig := genBootImageConfigs(ctx)[artBootImageName]
 		addDependenciesOntoBootImageModules(ctx, artImageConfig.modules)

 		// Add dependencies on all the modules configured in the "boot" boot image. That does not
 		// include modules configured in the "art" boot image.
 		bootImageConfig := p.getImageConfig(ctx)
 		addDependenciesOntoBootImageModules(ctx, bootImageConfig.modules)

 		// Add dependencies on all the updatable modules.
 		updatableModules := dexpreopt.GetGlobalConfig(ctx).UpdatableBootJars
 		addDependenciesOntoBootImageModules(ctx, updatableModules)

 		// Add dependencies on all the fragments.
 		addDependencyOntoApexVariants(ctx, "fragments", p.properties.Fragments, platformBootclasspathFragmentDepTag)
 	}
 }

 func addDependencyOntoApexVariants(ctx android.BottomUpMutatorContext, propertyName string, refs []ApexVariantReference, tag blueprint.DependencyTag) {
 	for i, ref := range refs {
 		apex := proptools.StringDefault(ref.Apex, "platform")

 		if ref.Module == nil {
 			ctx.PropertyErrorf(propertyName, "missing module name at position %d", i)
 			continue
 		}
 		name := proptools.String(ref.Module)

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

 func addDependencyOntoApexModulePair(ctx android.BottomUpMutatorContext, apex string, name string, tag blueprint.DependencyTag) {
 	var variations []blueprint.Variation
 	if apex != "platform" {
 		// Pick the correct apex variant.
 		variations = []blueprint.Variation{
 			{Mutator: "apex", Variation: apex},
 		}
 	}

 	addedDep := false
 	if ctx.OtherModuleDependencyVariantExists(variations, name) {
 		ctx.AddFarVariationDependencies(variations, tag, name)
 		addedDep = true
 	}

 	// Add a dependency on the prebuilt module if it exists.
 	prebuiltName := android.PrebuiltNameFromSource(name)
 	if ctx.OtherModuleDependencyVariantExists(variations, prebuiltName) {
 		ctx.AddVariationDependencies(variations, tag, prebuiltName)
 		addedDep = true
 	}

 	// If no appropriate variant existing for this, so no dependency could be added, then it is an
 	// error, unless missing dependencies are allowed. The simplest way to handle that is to add a
 	// dependency that will not be satisfied and the default behavior will handle it.
 	if !addedDep {
 		// Add dependency on the unprefixed (i.e. source or renamed prebuilt) module which we know does
 		// not exist. The resulting error message will contain useful information about the available
 		// variants.
 		reportMissingVariationDependency(ctx, variations, name)

 		// Add dependency on the missing prefixed prebuilt variant too if a module with that name exists
 		// so that information about its available variants will be reported too.
 		if ctx.OtherModuleExists(prebuiltName) {
 			reportMissingVariationDependency(ctx, variations, prebuiltName)
 		}
 	}
 }

 // reportMissingVariationDependency intentionally adds a dependency on a missing variation in order
 // to generate an appropriate error message with information about the available variations.
 func reportMissingVariationDependency(ctx android.BottomUpMutatorContext, variations []blueprint.Variation, name string) {
 	modules := ctx.AddFarVariationDependencies(variations, nil, name)
 	if len(modules) != 1 {
 		panic(fmt.Errorf("Internal Error: expected one module, found %d", len(modules)))
 		return
 	}
 	if modules[0] != nil {
 		panic(fmt.Errorf("Internal Error: expected module to be missing but was found: %q", modules[0]))
 		return
 	}
 }

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

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

 func (b *platformBootclasspathModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	b.classpathFragmentBase().generateAndroidBuildActions(ctx)

 	ctx.VisitDirectDepsIf(isActiveModule, func(module android.Module) {
 		tag := ctx.OtherModuleDependencyTag(module)
 		if tag == platformBootclasspathModuleDepTag {
 			b.configuredModules = append(b.configuredModules, module)
 		} else if tag == platformBootclasspathFragmentDepTag {
 			b.fragments = append(b.fragments, module)
 		}
 	})

 	b.generateHiddenAPIBuildActions(ctx, b.configuredModules)

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

 	// 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
 	}

 	// Construct the boot image info from the config.
 	info := BootImageInfo{imageConfig: imageConfig}

 	// Make it available for other modules.
 	ctx.SetProvider(BootImageInfoProvider, info)
 }

 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) {

 	// 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

 	// 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
 	}

 	hiddenAPISupportingModules := []hiddenAPISupportingModule{}
 	for _, module := range modules {
 		if h, ok := module.(hiddenAPISupportingModule); ok {
 			if h.bootDexJar() == nil {
 				ctx.ModuleErrorf("module %s does not provide a bootDexJar file", module)
 			}
 			if h.flagsCSV() == nil {
 				ctx.ModuleErrorf("module %s does not provide a flagsCSV file", module)
 			}
 			if h.indexCSV() == nil {
 				ctx.ModuleErrorf("module %s does not provide an indexCSV file", module)
 			}
 			if h.metadataCSV() == nil {
 				ctx.ModuleErrorf("module %s does not provide a metadataCSV file", module)
 			}

 			if ctx.Failed() {
 				continue
 			}

 			hiddenAPISupportingModules = append(hiddenAPISupportingModules, h)
 		} else {
 			ctx.ModuleErrorf("module %s of type %s does not support hidden API processing", module, ctx.OtherModuleType(module))
 		}
 	}

 	moduleSpecificFlagsPaths := android.Paths{}
 	for _, module := range hiddenAPISupportingModules {
 		moduleSpecificFlagsPaths = append(moduleSpecificFlagsPaths, module.flagsCSV())
 	}

 	augmentationInfo := b.properties.Hidden_api.hiddenAPIFlagFileInfo(ctx)

 	outputPath := hiddenAPISingletonPaths(ctx).flags
 	baseFlagsPath := hiddenAPISingletonPaths(ctx).stubFlags
 	ruleToGenerateHiddenApiFlags(ctx, outputPath, baseFlagsPath, moduleSpecificFlagsPaths, augmentationInfo)

 	b.generateHiddenAPIIndexRules(ctx, hiddenAPISupportingModules)
 	b.generatedHiddenAPIMetadataRules(ctx, hiddenAPISupportingModules)
 }

 func (b *platformBootclasspathModule) generateHiddenAPIIndexRules(ctx android.ModuleContext, modules []hiddenAPISupportingModule) {
 	indexes := android.Paths{}
 	for _, module := range modules {
 		indexes = append(indexes, module.indexCSV())
 	}

 	rule := android.NewRuleBuilder(pctx, ctx)
 	rule.Command().
 		BuiltTool("merge_csv").
 		Flag("--key_field signature").
 		FlagWithArg("--header=", "signature,file,startline,startcol,endline,endcol,properties").
 		FlagWithOutput("--output=", hiddenAPISingletonPaths(ctx).index).
 		Inputs(indexes)
 	rule.Build("platform-bootclasspath-monolithic-hiddenapi-index", "monolithic hidden API index")
 }

 func (b *platformBootclasspathModule) generatedHiddenAPIMetadataRules(ctx android.ModuleContext, modules []hiddenAPISupportingModule) {
 	metadataCSVFiles := android.Paths{}
 	for _, module := range modules {
 		metadataCSVFiles = append(metadataCSVFiles, module.metadataCSV())
 	}

 	rule := android.NewRuleBuilder(pctx, ctx)

 	outputPath := hiddenAPISingletonPaths(ctx).metadata

 	rule.Command().
 		BuiltTool("merge_csv").
 		Flag("--key_field signature").
 		FlagWithOutput("--output=", outputPath).
 		Inputs(metadataCSVFiles)

 	rule.Build("platform-bootclasspath-monolithic-hiddenapi-metadata", "monolithic hidden API metadata")
 }
	// 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"
	"github.com/google/blueprint"
	"github.com/google/blueprint/proptools"
	)

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

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

	ctx.FinalDepsMutators(func(ctx android.RegisterMutatorsContext) {
	ctx.BottomUp("platform_bootclasspath_deps", platformBootclasspathDepsMutator)
	})
	}

	type platformBootclasspathDependencyTag struct {
	blueprint.BaseDependencyTag

	name string
	}

	// Avoid having to make platform bootclasspath content visible to the platform bootclasspath.
	//
	// This is a temporary workaround to make it easier to migrate to platform bootclasspath with proper
	// dependencies.
	// TODO(b/177892522): Remove this and add needed visibility.
	func (t platformBootclasspathDependencyTag) ExcludeFromVisibilityEnforcement() {
	}

	// The tag used for the dependency between the platform bootclasspath and any configured boot jars.
	var platformBootclasspathModuleDepTag = platformBootclasspathDependencyTag{name: "module"}

	// The tag used for the dependency between the platform bootclasspath and bootclasspath_fragments.
	var platformBootclasspathFragmentDepTag = platformBootclasspathDependencyTag{name: "fragment"}

	var _ android.ExcludeFromVisibilityEnforcementTag = platformBootclasspathDependencyTag{}

	type platformBootclasspathModule struct {
	android.ModuleBase
	ClasspathFragmentBase

	properties platformBootclasspathProperties

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

	// The apex:module pairs obtained from the fragments.
	//
	// Currently only for testing.
	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
	}

	// ApexVariantReference specifies a particular apex variant of a module.
	type ApexVariantReference struct {
	// The name of the module apex variant, i.e. the apex containing the module variant.
	//
	// If this is not specified then it defaults to "platform" which will cause a dependency to be
	// added to the module's platform variant.
	Apex *string

	// The name of the module.
	Module *string
	}

	type platformBootclasspathProperties struct {
	// The names of the bootclasspath_fragment modules that form part of this
	// platform_bootclasspath.
	Fragments []ApexVariantReference

	Hidden_api HiddenAPIFlagFileProperties
	}

	func platformBootclasspathFactory() android.Module {
	m := &platformBootclasspathModule{}
	m.AddProperties(&m.properties)
	// TODO(satayev): split systemserver and apex jars into separate configs.
	initClasspathFragment(m)
	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().getAndroidMkEntries()...)
	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) {
	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 platformBootclasspathDepsMutator(ctx android.BottomUpMutatorContext) {
	m := ctx.Module()
	if p, ok := m.(*platformBootclasspathModule); ok {
	// Add dependencies on all the modules configured in the "art" boot image.
	artImageConfig := genBootImageConfigs(ctx)[artBootImageName]
	addDependenciesOntoBootImageModules(ctx, artImageConfig.modules)

	// Add dependencies on all the modules configured in the "boot" boot image. That does not
	// include modules configured in the "art" boot image.
	bootImageConfig := p.getImageConfig(ctx)
	addDependenciesOntoBootImageModules(ctx, bootImageConfig.modules)

	// Add dependencies on all the updatable modules.
	updatableModules := dexpreopt.GetGlobalConfig(ctx).UpdatableBootJars
	addDependenciesOntoBootImageModules(ctx, updatableModules)

	// Add dependencies on all the fragments.
	addDependencyOntoApexVariants(ctx, "fragments", p.properties.Fragments, platformBootclasspathFragmentDepTag)
	}
	}

	func addDependencyOntoApexVariants(ctx android.BottomUpMutatorContext, propertyName string, refs []ApexVariantReference, tag blueprint.DependencyTag) {
	for i, ref := range refs {
	apex := proptools.StringDefault(ref.Apex, "platform")

	if ref.Module == nil {
	ctx.PropertyErrorf(propertyName, "missing module name at position %d", i)
	continue
	}
	name := proptools.String(ref.Module)

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

	func addDependencyOntoApexModulePair(ctx android.BottomUpMutatorContext, apex string, name string, tag blueprint.DependencyTag) {
	var variations []blueprint.Variation
	if apex != "platform" {
	// Pick the correct apex variant.
	variations = []blueprint.Variation{
	{Mutator: "apex", Variation: apex},
	}
	}

	addedDep := false
	if ctx.OtherModuleDependencyVariantExists(variations, name) {
	ctx.AddFarVariationDependencies(variations, tag, name)
	addedDep = true
	}

	// Add a dependency on the prebuilt module if it exists.
	prebuiltName := android.PrebuiltNameFromSource(name)
	if ctx.OtherModuleDependencyVariantExists(variations, prebuiltName) {
	ctx.AddVariationDependencies(variations, tag, prebuiltName)
	addedDep = true
	}

	// If no appropriate variant existing for this, so no dependency could be added, then it is an
	// error, unless missing dependencies are allowed. The simplest way to handle that is to add a
	// dependency that will not be satisfied and the default behavior will handle it.
	if !addedDep {
	// Add dependency on the unprefixed (i.e. source or renamed prebuilt) module which we know does
	// not exist. The resulting error message will contain useful information about the available
	// variants.
	reportMissingVariationDependency(ctx, variations, name)

	// Add dependency on the missing prefixed prebuilt variant too if a module with that name exists
	// so that information about its available variants will be reported too.
	if ctx.OtherModuleExists(prebuiltName) {
	reportMissingVariationDependency(ctx, variations, prebuiltName)
	}
	}
	}

	// reportMissingVariationDependency intentionally adds a dependency on a missing variation in order
	// to generate an appropriate error message with information about the available variations.
	func reportMissingVariationDependency(ctx android.BottomUpMutatorContext, variations []blueprint.Variation, name string) {
	modules := ctx.AddFarVariationDependencies(variations, nil, name)
	if len(modules) != 1 {
	panic(fmt.Errorf("Internal Error: expected one module, found %d", len(modules)))
	return
	}
	if modules[0] != nil {
	panic(fmt.Errorf("Internal Error: expected module to be missing but was found: %q", modules[0]))
	return
	}
	}

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

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

	func (b *platformBootclasspathModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	b.classpathFragmentBase().generateAndroidBuildActions(ctx)

	ctx.VisitDirectDepsIf(isActiveModule, func(module android.Module) {
	tag := ctx.OtherModuleDependencyTag(module)
	if tag == platformBootclasspathModuleDepTag {
	b.configuredModules = append(b.configuredModules, module)
	} else if tag == platformBootclasspathFragmentDepTag {
	b.fragments = append(b.fragments, module)
	}
	})

	b.generateHiddenAPIBuildActions(ctx, b.configuredModules)

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

	// 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
	}

	// Construct the boot image info from the config.
	info := BootImageInfo{imageConfig: imageConfig}

	// Make it available for other modules.
	ctx.SetProvider(BootImageInfoProvider, info)
	}

	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) {

	// 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

	// 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
	}

	hiddenAPISupportingModules := []hiddenAPISupportingModule{}
	for _, module := range modules {
	if h, ok := module.(hiddenAPISupportingModule); ok {
	if h.bootDexJar() == nil {
	ctx.ModuleErrorf("module %s does not provide a bootDexJar file", module)
	}
	if h.flagsCSV() == nil {
	ctx.ModuleErrorf("module %s does not provide a flagsCSV file", module)
	}
	if h.indexCSV() == nil {
	ctx.ModuleErrorf("module %s does not provide an indexCSV file", module)
	}
	if h.metadataCSV() == nil {
	ctx.ModuleErrorf("module %s does not provide a metadataCSV file", module)
	}

	if ctx.Failed() {
	continue
	}

	hiddenAPISupportingModules = append(hiddenAPISupportingModules, h)
	} else {
	ctx.ModuleErrorf("module %s of type %s does not support hidden API processing", module, ctx.OtherModuleType(module))
	}
	}

	moduleSpecificFlagsPaths := android.Paths{}
	for _, module := range hiddenAPISupportingModules {
	moduleSpecificFlagsPaths = append(moduleSpecificFlagsPaths, module.flagsCSV())
	}

	augmentationInfo := b.properties.Hidden_api.hiddenAPIFlagFileInfo(ctx)

	outputPath := hiddenAPISingletonPaths(ctx).flags
	baseFlagsPath := hiddenAPISingletonPaths(ctx).stubFlags
	ruleToGenerateHiddenApiFlags(ctx, outputPath, baseFlagsPath, moduleSpecificFlagsPaths, augmentationInfo)

	b.generateHiddenAPIIndexRules(ctx, hiddenAPISupportingModules)
	b.generatedHiddenAPIMetadataRules(ctx, hiddenAPISupportingModules)
	}

	func (b *platformBootclasspathModule) generateHiddenAPIIndexRules(ctx android.ModuleContext, modules []hiddenAPISupportingModule) {
	indexes := android.Paths{}
	for _, module := range modules {
	indexes = append(indexes, module.indexCSV())
	}

	rule := android.NewRuleBuilder(pctx, ctx)
	rule.Command().
	BuiltTool("merge_csv").
	Flag("--key_field signature").
	FlagWithArg("--header=", "signature,file,startline,startcol,endline,endcol,properties").
	FlagWithOutput("--output=", hiddenAPISingletonPaths(ctx).index).
	Inputs(indexes)
	rule.Build("platform-bootclasspath-monolithic-hiddenapi-index", "monolithic hidden API index")
	}

	func (b *platformBootclasspathModule) generatedHiddenAPIMetadataRules(ctx android.ModuleContext, modules []hiddenAPISupportingModule) {
	metadataCSVFiles := android.Paths{}
	for _, module := range modules {
	metadataCSVFiles = append(metadataCSVFiles, module.metadataCSV())
	}

	rule := android.NewRuleBuilder(pctx, ctx)

	outputPath := hiddenAPISingletonPaths(ctx).metadata

	rule.Command().
	BuiltTool("merge_csv").
	Flag("--key_field signature").
	FlagWithOutput("--output=", outputPath).
	Inputs(metadataCSVFiles)

	rule.Build("platform-bootclasspath-monolithic-hiddenapi-metadata", "monolithic hidden API metadata")
	}