common/module.go - SHIFTPHONES/android_build_soong - Gitiles

 // Copyright 2015 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 common

 import (
 	"fmt"
 	"path/filepath"
 	"strings"

 	"android/soong"
 	"android/soong/glob"

 	"github.com/google/blueprint"
 )

 var (
 	DeviceSharedLibrary = "shared_library"
 	DeviceStaticLibrary = "static_library"
 	DeviceExecutable    = "executable"
 	HostSharedLibrary   = "host_shared_library"
 	HostStaticLibrary   = "host_static_library"
 	HostExecutable      = "host_executable"
 )

 type ModuleBuildParams struct {
 	Rule      blueprint.Rule
 	Output    WritablePath
 	Outputs   WritablePaths
 	Input     Path
 	Inputs    Paths
 	Implicit  Path
 	Implicits Paths
 	OrderOnly Paths
 	Default   bool
 	Args      map[string]string
 }

 type androidBaseContext interface {
 	Arch() Arch
 	HostOrDevice() HostOrDevice
 	HostType() HostType
 	Host() bool
 	Device() bool
 	Darwin() bool
 	Debug() bool
 	AConfig() Config
 	Proprietary() bool
 	InstallInData() bool
 }

 type AndroidBaseContext interface {
 	blueprint.BaseModuleContext
 	androidBaseContext
 }

 type AndroidModuleContext interface {
 	blueprint.ModuleContext
 	androidBaseContext

 	// Similar to Build, but takes Paths instead of []string,
 	// and performs more verification.
 	ModuleBuild(pctx blueprint.PackageContext, params ModuleBuildParams)

 	ExpandSources(srcFiles, excludes []string) Paths
 	Glob(outDir, globPattern string, excludes []string) Paths

 	InstallFile(installPath OutputPath, srcPath Path, deps ...Path) Path
 	InstallFileName(installPath OutputPath, name string, srcPath Path, deps ...Path) Path
 	CheckbuildFile(srcPath Path)
 }

 type AndroidModule interface {
 	blueprint.Module

 	GenerateAndroidBuildActions(AndroidModuleContext)

 	base() *AndroidModuleBase
 	Enabled() bool
 	HostOrDevice() HostOrDevice
 	InstallInData() bool
 }

 type commonProperties struct {
 	Name string
 	Deps []string
 	Tags []string

 	// emit build rules for this module
 	Enabled *bool `android:"arch_variant"`

 	// control whether this module compiles for 32-bit, 64-bit, or both.  Possible values
 	// are "32" (compile for 32-bit only), "64" (compile for 64-bit only), "both" (compile for both
 	// architectures), or "first" (compile for 64-bit on a 64-bit platform, and 32-bit on a 32-bit
 	// platform
 	Compile_multilib string

 	// whether this is a proprietary vendor module, and should be installed into /vendor
 	Proprietary bool

 	// Set by HostOrDeviceMutator
 	CompileHostOrDevice HostOrDevice `blueprint:"mutated"`

 	// Set by HostTypeMutator
 	CompileHostType HostType `blueprint:"mutated"`

 	// Set by ArchMutator
 	CompileArch Arch `blueprint:"mutated"`

 	// Set by InitAndroidModule
 	HostOrDeviceSupported HostOrDeviceSupported `blueprint:"mutated"`
 }

 type hostAndDeviceProperties struct {
 	Host_supported   bool
 	Device_supported bool
 }

 type Multilib string

 const (
 	MultilibBoth    Multilib = "both"
 	MultilibFirst   Multilib = "first"
 	MultilibCommon  Multilib = "common"
 	MultilibDefault Multilib = ""
 )

 func InitAndroidModule(m AndroidModule,
 	propertyStructs ...interface{}) (blueprint.Module, []interface{}) {

 	base := m.base()
 	base.module = m

 	propertyStructs = append(propertyStructs, &base.commonProperties, &base.variableProperties)

 	return m, propertyStructs
 }

 func InitAndroidArchModule(m AndroidModule, hod HostOrDeviceSupported, defaultMultilib Multilib,
 	propertyStructs ...interface{}) (blueprint.Module, []interface{}) {

 	_, propertyStructs = InitAndroidModule(m, propertyStructs...)

 	base := m.base()
 	base.commonProperties.HostOrDeviceSupported = hod
 	base.commonProperties.Compile_multilib = string(defaultMultilib)

 	switch hod {
 	case HostAndDeviceSupported:
 		// Default to module to device supported, host not supported, can override in module
 		// properties
 		base.hostAndDeviceProperties.Device_supported = true
 		fallthrough
 	case HostAndDeviceDefault:
 		propertyStructs = append(propertyStructs, &base.hostAndDeviceProperties)
 	}

 	return InitArchModule(m, propertyStructs...)
 }

 // A AndroidModuleBase object contains the properties that are common to all Android
 // modules.  It should be included as an anonymous field in every module
 // struct definition.  InitAndroidModule should then be called from the module's
 // factory function, and the return values from InitAndroidModule should be
 // returned from the factory function.
 //
 // The AndroidModuleBase type is responsible for implementing the
 // GenerateBuildActions method to support the blueprint.Module interface. This
 // method will then call the module's GenerateAndroidBuildActions method once
 // for each build variant that is to be built. GenerateAndroidBuildActions is
 // passed a AndroidModuleContext rather than the usual blueprint.ModuleContext.
 // AndroidModuleContext exposes extra functionality specific to the Android build
 // system including details about the particular build variant that is to be
 // generated.
 //
 // For example:
 //
 //     import (
 //         "android/soong/common"
 //         "github.com/google/blueprint"
 //     )
 //
 //     type myModule struct {
 //         common.AndroidModuleBase
 //         properties struct {
 //             MyProperty string
 //         }
 //     }
 //
 //     func NewMyModule() (blueprint.Module, []interface{}) {
 //         m := &myModule{}
 //         return common.InitAndroidModule(m, &m.properties)
 //     }
 //
 //     func (m *myModule) GenerateAndroidBuildActions(ctx common.AndroidModuleContext) {
 //         // Get the CPU architecture for the current build variant.
 //         variantArch := ctx.Arch()
 //
 //         // ...
 //     }
 type AndroidModuleBase struct {
 	// Putting the curiously recurring thing pointing to the thing that contains
 	// the thing pattern to good use.
 	module AndroidModule

 	commonProperties        commonProperties
 	variableProperties      variableProperties
 	hostAndDeviceProperties hostAndDeviceProperties
 	generalProperties       []interface{}
 	archProperties          []*archProperties

 	noAddressSanitizer bool
 	installFiles       Paths
 	checkbuildFiles    Paths

 	// Used by buildTargetSingleton to create checkbuild and per-directory build targets
 	// Only set on the final variant of each module
 	installTarget    string
 	checkbuildTarget string
 	blueprintDir     string
 }

 func (a *AndroidModuleBase) base() *AndroidModuleBase {
 	return a
 }

 func (a *AndroidModuleBase) SetHostOrDevice(hod HostOrDevice) {
 	a.commonProperties.CompileHostOrDevice = hod
 }

 func (a *AndroidModuleBase) SetHostType(ht HostType) {
 	a.commonProperties.CompileHostType = ht
 }

 func (a *AndroidModuleBase) SetArch(arch Arch) {
 	a.commonProperties.CompileArch = arch
 }

 func (a *AndroidModuleBase) HostOrDevice() HostOrDevice {
 	return a.commonProperties.CompileHostOrDevice
 }

 func (a *AndroidModuleBase) HostType() HostType {
 	return a.commonProperties.CompileHostType
 }

 func (a *AndroidModuleBase) Host() bool {
 	return a.HostOrDevice().Host()
 }

 func (a *AndroidModuleBase) Arch() Arch {
 	return a.commonProperties.CompileArch
 }

 func (a *AndroidModuleBase) HostSupported() bool {
 	return a.commonProperties.HostOrDeviceSupported == HostSupported ||
 		a.commonProperties.HostOrDeviceSupported == HostAndDeviceSupported &&
 			a.hostAndDeviceProperties.Host_supported
 }

 func (a *AndroidModuleBase) DeviceSupported() bool {
 	return a.commonProperties.HostOrDeviceSupported == DeviceSupported ||
 		a.commonProperties.HostOrDeviceSupported == HostAndDeviceSupported &&
 			a.hostAndDeviceProperties.Device_supported
 }

 func (a *AndroidModuleBase) Enabled() bool {
 	if a.commonProperties.Enabled == nil {
 		if a.HostSupported() && a.HostOrDevice().Host() && a.HostType() == Windows {
 			return false
 		} else {
 			return true
 		}
 	}
 	return *a.commonProperties.Enabled
 }

 func (a *AndroidModuleBase) computeInstallDeps(
 	ctx blueprint.ModuleContext) Paths {

 	result := Paths{}
 	ctx.VisitDepsDepthFirstIf(isFileInstaller,
 		func(m blueprint.Module) {
 			fileInstaller := m.(fileInstaller)
 			files := fileInstaller.filesToInstall()
 			result = append(result, files...)
 		})

 	return result
 }

 func (a *AndroidModuleBase) filesToInstall() Paths {
 	return a.installFiles
 }

 func (p *AndroidModuleBase) NoAddressSanitizer() bool {
 	return p.noAddressSanitizer
 }

 func (p *AndroidModuleBase) InstallInData() bool {
 	return false
 }

 func (a *AndroidModuleBase) generateModuleTarget(ctx blueprint.ModuleContext) {
 	if a != ctx.FinalModule().(AndroidModule).base() {
 		return
 	}

 	allInstalledFiles := Paths{}
 	allCheckbuildFiles := Paths{}
 	ctx.VisitAllModuleVariants(func(module blueprint.Module) {
 		a := module.(AndroidModule).base()
 		allInstalledFiles = append(allInstalledFiles, a.installFiles...)
 		allCheckbuildFiles = append(allCheckbuildFiles, a.checkbuildFiles...)
 	})

 	deps := []string{}

 	if len(allInstalledFiles) > 0 {
 		name := ctx.ModuleName() + "-install"
 		ctx.Build(pctx, blueprint.BuildParams{
 			Rule:      blueprint.Phony,
 			Outputs:   []string{name},
 			Implicits: allInstalledFiles.Strings(),
 			Optional:  ctx.Config().(Config).EmbeddedInMake(),
 		})
 		deps = append(deps, name)
 		a.installTarget = name
 	}

 	if len(allCheckbuildFiles) > 0 {
 		name := ctx.ModuleName() + "-checkbuild"
 		ctx.Build(pctx, blueprint.BuildParams{
 			Rule:      blueprint.Phony,
 			Outputs:   []string{name},
 			Implicits: allCheckbuildFiles.Strings(),
 			Optional:  true,
 		})
 		deps = append(deps, name)
 		a.checkbuildTarget = name
 	}

 	if len(deps) > 0 {
 		suffix := ""
 		if ctx.Config().(Config).EmbeddedInMake() {
 			suffix = "-soong"
 		}

 		ctx.Build(pctx, blueprint.BuildParams{
 			Rule:      blueprint.Phony,
 			Outputs:   []string{ctx.ModuleName() + suffix},
 			Implicits: deps,
 			Optional:  true,
 		})

 		a.blueprintDir = ctx.ModuleDir()
 	}
 }

 func (a *AndroidModuleBase) androidBaseContextFactory(ctx blueprint.BaseModuleContext) androidBaseContextImpl {
 	return androidBaseContextImpl{
 		arch:          a.commonProperties.CompileArch,
 		hod:           a.commonProperties.CompileHostOrDevice,
 		ht:            a.commonProperties.CompileHostType,
 		proprietary:   a.commonProperties.Proprietary,
 		config:        ctx.Config().(Config),
 		installInData: a.module.InstallInData(),
 	}
 }

 func (a *AndroidModuleBase) GenerateBuildActions(ctx blueprint.ModuleContext) {
 	androidCtx := &androidModuleContext{
 		ModuleContext:          ctx,
 		androidBaseContextImpl: a.androidBaseContextFactory(ctx),
 		installDeps:            a.computeInstallDeps(ctx),
 		installFiles:           a.installFiles,
 		missingDeps:            ctx.GetMissingDependencies(),
 	}

 	if !a.Enabled() {
 		return
 	}

 	a.module.GenerateAndroidBuildActions(androidCtx)
 	if ctx.Failed() {
 		return
 	}

 	a.installFiles = append(a.installFiles, androidCtx.installFiles...)
 	a.checkbuildFiles = append(a.checkbuildFiles, androidCtx.checkbuildFiles...)

 	a.generateModuleTarget(ctx)
 	if ctx.Failed() {
 		return
 	}
 }

 type androidBaseContextImpl struct {
 	arch          Arch
 	hod           HostOrDevice
 	ht            HostType
 	debug         bool
 	config        Config
 	proprietary   bool
 	installInData bool
 }

 type androidModuleContext struct {
 	blueprint.ModuleContext
 	androidBaseContextImpl
 	installDeps     Paths
 	installFiles    Paths
 	checkbuildFiles Paths
 	missingDeps     []string
 }

 func (a *androidModuleContext) ninjaError(outputs []string, err error) {
 	a.ModuleContext.Build(pctx, blueprint.BuildParams{
 		Rule:     ErrorRule,
 		Outputs:  outputs,
 		Optional: true,
 		Args: map[string]string{
 			"error": err.Error(),
 		},
 	})
 	return
 }

 func (a *androidModuleContext) Build(pctx blueprint.PackageContext, params blueprint.BuildParams) {
 	if a.missingDeps != nil {
 		a.ninjaError(params.Outputs, fmt.Errorf("module %s missing dependencies: %s\n",
 			a.ModuleName(), strings.Join(a.missingDeps, ", ")))
 		return
 	}

 	params.Optional = true
 	a.ModuleContext.Build(pctx, params)
 }

 func (a *androidModuleContext) ModuleBuild(pctx blueprint.PackageContext, params ModuleBuildParams) {
 	bparams := blueprint.BuildParams{
 		Rule:      params.Rule,
 		Outputs:   params.Outputs.Strings(),
 		Inputs:    params.Inputs.Strings(),
 		Implicits: params.Implicits.Strings(),
 		OrderOnly: params.OrderOnly.Strings(),
 		Args:      params.Args,
 		Optional:  !params.Default,
 	}

 	if params.Output != nil {
 		bparams.Outputs = append(bparams.Outputs, params.Output.String())
 	}
 	if params.Input != nil {
 		bparams.Inputs = append(bparams.Inputs, params.Input.String())
 	}
 	if params.Implicit != nil {
 		bparams.Implicits = append(bparams.Implicits, params.Implicit.String())
 	}

 	if a.missingDeps != nil {
 		a.ninjaError(bparams.Outputs, fmt.Errorf("module %s missing dependencies: %s\n",
 			a.ModuleName(), strings.Join(a.missingDeps, ", ")))
 		return
 	}

 	a.ModuleContext.Build(pctx, bparams)
 }

 func (a *androidModuleContext) GetMissingDependencies() []string {
 	return a.missingDeps
 }

 func (a *androidBaseContextImpl) Arch() Arch {
 	return a.arch
 }

 func (a *androidBaseContextImpl) HostOrDevice() HostOrDevice {
 	return a.hod
 }

 func (a *androidBaseContextImpl) HostType() HostType {
 	return a.ht
 }

 func (a *androidBaseContextImpl) Host() bool {
 	return a.hod.Host()
 }

 func (a *androidBaseContextImpl) Device() bool {
 	return a.hod.Device()
 }

 func (a *androidBaseContextImpl) Darwin() bool {
 	return a.hod.Host() && a.ht == Darwin
 }

 func (a *androidBaseContextImpl) Debug() bool {
 	return a.debug
 }

 func (a *androidBaseContextImpl) AConfig() Config {
 	return a.config
 }

 func (a *androidBaseContextImpl) Proprietary() bool {
 	return a.proprietary
 }

 func (a *androidBaseContextImpl) InstallInData() bool {
 	return a.installInData
 }

 func (a *androidModuleContext) InstallFileName(installPath OutputPath, name string, srcPath Path,
 	deps ...Path) Path {

 	fullInstallPath := installPath.Join(a, name)

 	if a.Host() || !a.AConfig().SkipDeviceInstall() {
 		deps = append(deps, a.installDeps...)

 		a.ModuleBuild(pctx, ModuleBuildParams{
 			Rule:      Cp,
 			Output:    fullInstallPath,
 			Input:     srcPath,
 			OrderOnly: Paths(deps),
 			Default:   !a.AConfig().EmbeddedInMake(),
 		})

 		a.installFiles = append(a.installFiles, fullInstallPath)
 	}
 	a.checkbuildFiles = append(a.checkbuildFiles, srcPath)
 	return fullInstallPath
 }

 func (a *androidModuleContext) InstallFile(installPath OutputPath, srcPath Path, deps ...Path) Path {
 	return a.InstallFileName(installPath, filepath.Base(srcPath.String()), srcPath, deps...)
 }

 func (a *androidModuleContext) CheckbuildFile(srcPath Path) {
 	a.checkbuildFiles = append(a.checkbuildFiles, srcPath)
 }

 type fileInstaller interface {
 	filesToInstall() Paths
 }

 func isFileInstaller(m blueprint.Module) bool {
 	_, ok := m.(fileInstaller)
 	return ok
 }

 func isAndroidModule(m blueprint.Module) bool {
 	_, ok := m.(AndroidModule)
 	return ok
 }

 func findStringInSlice(str string, slice []string) int {
 	for i, s := range slice {
 		if s == str {
 			return i
 		}
 	}
 	return -1
 }

 func (ctx *androidModuleContext) ExpandSources(srcFiles, excludes []string) Paths {
 	prefix := PathForModuleSrc(ctx).String()
 	for i, e := range excludes {
 		j := findStringInSlice(e, srcFiles)
 		if j != -1 {
 			srcFiles = append(srcFiles[:j], srcFiles[j+1:]...)
 		}

 		excludes[i] = filepath.Join(prefix, e)
 	}

 	globbedSrcFiles := make(Paths, 0, len(srcFiles))
 	for _, s := range srcFiles {
 		if glob.IsGlob(s) {
 			globbedSrcFiles = append(globbedSrcFiles, ctx.Glob("src_glob", filepath.Join(prefix, s), excludes)...)
 		} else {
 			globbedSrcFiles = append(globbedSrcFiles, PathForModuleSrc(ctx, s))
 		}
 	}

 	return globbedSrcFiles
 }

 func (ctx *androidModuleContext) Glob(outDir, globPattern string, excludes []string) Paths {
 	ret, err := Glob(ctx, PathForModuleOut(ctx, outDir).String(), globPattern, excludes)
 	if err != nil {
 		ctx.ModuleErrorf("glob: %s", err.Error())
 	}
 	return pathsForModuleSrcFromFullPath(ctx, ret)
 }

 func init() {
 	soong.RegisterSingletonType("buildtarget", BuildTargetSingleton)
 }

 func BuildTargetSingleton() blueprint.Singleton {
 	return &buildTargetSingleton{}
 }

 type buildTargetSingleton struct{}

 func (c *buildTargetSingleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
 	checkbuildDeps := []string{}

 	dirModules := make(map[string][]string)

 	ctx.VisitAllModules(func(module blueprint.Module) {
 		if a, ok := module.(AndroidModule); ok {
 			blueprintDir := a.base().blueprintDir
 			installTarget := a.base().installTarget
 			checkbuildTarget := a.base().checkbuildTarget

 			if checkbuildTarget != "" {
 				checkbuildDeps = append(checkbuildDeps, checkbuildTarget)
 				dirModules[blueprintDir] = append(dirModules[blueprintDir], checkbuildTarget)
 			}

 			if installTarget != "" {
 				dirModules[blueprintDir] = append(dirModules[blueprintDir], installTarget)
 			}
 		}
 	})

 	suffix := ""
 	if ctx.Config().(Config).EmbeddedInMake() {
 		suffix = "-soong"
 	}

 	// Create a top-level checkbuild target that depends on all modules
 	ctx.Build(pctx, blueprint.BuildParams{
 		Rule:      blueprint.Phony,
 		Outputs:   []string{"checkbuild" + suffix},
 		Implicits: checkbuildDeps,
 		Optional:  true,
 	})

 	// Create a mm/<directory> target that depends on all modules in a directory
 	dirs := sortedKeys(dirModules)
 	for _, dir := range dirs {
 		ctx.Build(pctx, blueprint.BuildParams{
 			Rule:      blueprint.Phony,
 			Outputs:   []string{filepath.Join("mm", dir)},
 			Implicits: dirModules[dir],
 			// HACK: checkbuild should be an optional build, but force it
 			// enabled for now in standalone builds
 			Optional: ctx.Config().(Config).EmbeddedInMake(),
 		})
 	}
 }

 type AndroidModulesByName struct {
 	slice []AndroidModule
 	ctx   interface {
 		ModuleName(blueprint.Module) string
 		ModuleSubDir(blueprint.Module) string
 	}
 }

 func (s AndroidModulesByName) Len() int { return len(s.slice) }
 func (s AndroidModulesByName) Less(i, j int) bool {
 	mi, mj := s.slice[i], s.slice[j]
 	ni, nj := s.ctx.ModuleName(mi), s.ctx.ModuleName(mj)

 	if ni != nj {
 		return ni < nj
 	} else {
 		return s.ctx.ModuleSubDir(mi) < s.ctx.ModuleSubDir(mj)
 	}
 }
 func (s AndroidModulesByName) Swap(i, j int) { s.slice[i], s.slice[j] = s.slice[j], s.slice[i] }
	// Copyright 2015 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 common

	import (
	"fmt"
	"path/filepath"
	"strings"

	"android/soong"
	"android/soong/glob"

	"github.com/google/blueprint"
	)

	var (
	DeviceSharedLibrary = "shared_library"
	DeviceStaticLibrary = "static_library"
	DeviceExecutable = "executable"
	HostSharedLibrary = "host_shared_library"
	HostStaticLibrary = "host_static_library"
	HostExecutable = "host_executable"
	)

	type ModuleBuildParams struct {
	Rule blueprint.Rule
	Output WritablePath
	Outputs WritablePaths
	Input Path
	Inputs Paths
	Implicit Path
	Implicits Paths
	OrderOnly Paths
	Default bool
	Args map[string]string
	}

	type androidBaseContext interface {
	Arch() Arch
	HostOrDevice() HostOrDevice
	HostType() HostType
	Host() bool
	Device() bool
	Darwin() bool
	Debug() bool
	AConfig() Config
	Proprietary() bool
	InstallInData() bool
	}

	type AndroidBaseContext interface {
	blueprint.BaseModuleContext
	androidBaseContext
	}

	type AndroidModuleContext interface {
	blueprint.ModuleContext
	androidBaseContext

	// Similar to Build, but takes Paths instead of []string,
	// and performs more verification.
	ModuleBuild(pctx blueprint.PackageContext, params ModuleBuildParams)

	ExpandSources(srcFiles, excludes []string) Paths
	Glob(outDir, globPattern string, excludes []string) Paths

	InstallFile(installPath OutputPath, srcPath Path, deps ...Path) Path
	InstallFileName(installPath OutputPath, name string, srcPath Path, deps ...Path) Path
	CheckbuildFile(srcPath Path)
	}

	type AndroidModule interface {
	blueprint.Module

	GenerateAndroidBuildActions(AndroidModuleContext)

	base() *AndroidModuleBase
	Enabled() bool
	HostOrDevice() HostOrDevice
	InstallInData() bool
	}

	type commonProperties struct {
	Name string
	Deps []string
	Tags []string

	// emit build rules for this module
	Enabled *bool `android:"arch_variant"`

	// control whether this module compiles for 32-bit, 64-bit, or both. Possible values
	// are "32" (compile for 32-bit only), "64" (compile for 64-bit only), "both" (compile for both
	// architectures), or "first" (compile for 64-bit on a 64-bit platform, and 32-bit on a 32-bit
	// platform
	Compile_multilib string

	// whether this is a proprietary vendor module, and should be installed into /vendor
	Proprietary bool

	// Set by HostOrDeviceMutator
	CompileHostOrDevice HostOrDevice `blueprint:"mutated"`

	// Set by HostTypeMutator
	CompileHostType HostType `blueprint:"mutated"`

	// Set by ArchMutator
	CompileArch Arch `blueprint:"mutated"`

	// Set by InitAndroidModule
	HostOrDeviceSupported HostOrDeviceSupported `blueprint:"mutated"`
	}

	type hostAndDeviceProperties struct {
	Host_supported bool
	Device_supported bool
	}

	type Multilib string

	const (
	MultilibBoth Multilib = "both"
	MultilibFirst Multilib = "first"
	MultilibCommon Multilib = "common"
	MultilibDefault Multilib = ""
	)

	func InitAndroidModule(m AndroidModule,
	propertyStructs ...interface{}) (blueprint.Module, []interface{}) {

	base := m.base()
	base.module = m

	propertyStructs = append(propertyStructs, &base.commonProperties, &base.variableProperties)

	return m, propertyStructs
	}

	func InitAndroidArchModule(m AndroidModule, hod HostOrDeviceSupported, defaultMultilib Multilib,
	propertyStructs ...interface{}) (blueprint.Module, []interface{}) {

	_, propertyStructs = InitAndroidModule(m, propertyStructs...)

	base := m.base()
	base.commonProperties.HostOrDeviceSupported = hod
	base.commonProperties.Compile_multilib = string(defaultMultilib)

	switch hod {
	case HostAndDeviceSupported:
	// Default to module to device supported, host not supported, can override in module
	// properties
	base.hostAndDeviceProperties.Device_supported = true
	fallthrough
	case HostAndDeviceDefault:
	propertyStructs = append(propertyStructs, &base.hostAndDeviceProperties)
	}

	return InitArchModule(m, propertyStructs...)
	}

	// A AndroidModuleBase object contains the properties that are common to all Android
	// modules. It should be included as an anonymous field in every module
	// struct definition. InitAndroidModule should then be called from the module's
	// factory function, and the return values from InitAndroidModule should be
	// returned from the factory function.
	//
	// The AndroidModuleBase type is responsible for implementing the
	// GenerateBuildActions method to support the blueprint.Module interface. This
	// method will then call the module's GenerateAndroidBuildActions method once
	// for each build variant that is to be built. GenerateAndroidBuildActions is
	// passed a AndroidModuleContext rather than the usual blueprint.ModuleContext.
	// AndroidModuleContext exposes extra functionality specific to the Android build
	// system including details about the particular build variant that is to be
	// generated.
	//
	// For example:
	//
	// import (
	// "android/soong/common"
	// "github.com/google/blueprint"
	// )
	//
	// type myModule struct {
	// common.AndroidModuleBase
	// properties struct {
	// MyProperty string
	// }
	// }
	//
	// func NewMyModule() (blueprint.Module, []interface{}) {
	// m := &myModule{}
	// return common.InitAndroidModule(m, &m.properties)
	// }
	//
	// func (m *myModule) GenerateAndroidBuildActions(ctx common.AndroidModuleContext) {
	// // Get the CPU architecture for the current build variant.
	// variantArch := ctx.Arch()
	//
	// // ...
	// }
	type AndroidModuleBase struct {
	// Putting the curiously recurring thing pointing to the thing that contains
	// the thing pattern to good use.
	module AndroidModule

	commonProperties commonProperties
	variableProperties variableProperties
	hostAndDeviceProperties hostAndDeviceProperties
	generalProperties []interface{}
	archProperties []*archProperties

	noAddressSanitizer bool
	installFiles Paths
	checkbuildFiles Paths

	// Used by buildTargetSingleton to create checkbuild and per-directory build targets
	// Only set on the final variant of each module
	installTarget string
	checkbuildTarget string
	blueprintDir string
	}

	func (a AndroidModuleBase) base() AndroidModuleBase {
	return a
	}

	func (a *AndroidModuleBase) SetHostOrDevice(hod HostOrDevice) {
	a.commonProperties.CompileHostOrDevice = hod
	}

	func (a *AndroidModuleBase) SetHostType(ht HostType) {
	a.commonProperties.CompileHostType = ht
	}

	func (a *AndroidModuleBase) SetArch(arch Arch) {
	a.commonProperties.CompileArch = arch
	}

	func (a *AndroidModuleBase) HostOrDevice() HostOrDevice {
	return a.commonProperties.CompileHostOrDevice
	}

	func (a *AndroidModuleBase) HostType() HostType {
	return a.commonProperties.CompileHostType
	}

	func (a *AndroidModuleBase) Host() bool {
	return a.HostOrDevice().Host()
	}

	func (a *AndroidModuleBase) Arch() Arch {
	return a.commonProperties.CompileArch
	}

	func (a *AndroidModuleBase) HostSupported() bool {
	return a.commonProperties.HostOrDeviceSupported == HostSupported \|\|
	a.commonProperties.HostOrDeviceSupported == HostAndDeviceSupported &&
	a.hostAndDeviceProperties.Host_supported
	}

	func (a *AndroidModuleBase) DeviceSupported() bool {
	return a.commonProperties.HostOrDeviceSupported == DeviceSupported \|\|
	a.commonProperties.HostOrDeviceSupported == HostAndDeviceSupported &&
	a.hostAndDeviceProperties.Device_supported
	}

	func (a *AndroidModuleBase) Enabled() bool {
	if a.commonProperties.Enabled == nil {
	if a.HostSupported() && a.HostOrDevice().Host() && a.HostType() == Windows {
	return false
	} else {
	return true
	}
	}
	return *a.commonProperties.Enabled
	}

	func (a *AndroidModuleBase) computeInstallDeps(
	ctx blueprint.ModuleContext) Paths {

	result := Paths{}
	ctx.VisitDepsDepthFirstIf(isFileInstaller,
	func(m blueprint.Module) {
	fileInstaller := m.(fileInstaller)
	files := fileInstaller.filesToInstall()
	result = append(result, files...)
	})

	return result
	}

	func (a *AndroidModuleBase) filesToInstall() Paths {
	return a.installFiles
	}

	func (p *AndroidModuleBase) NoAddressSanitizer() bool {
	return p.noAddressSanitizer
	}

	func (p *AndroidModuleBase) InstallInData() bool {
	return false
	}

	func (a *AndroidModuleBase) generateModuleTarget(ctx blueprint.ModuleContext) {
	if a != ctx.FinalModule().(AndroidModule).base() {
	return
	}

	allInstalledFiles := Paths{}
	allCheckbuildFiles := Paths{}
	ctx.VisitAllModuleVariants(func(module blueprint.Module) {
	a := module.(AndroidModule).base()
	allInstalledFiles = append(allInstalledFiles, a.installFiles...)
	allCheckbuildFiles = append(allCheckbuildFiles, a.checkbuildFiles...)
	})

	deps := []string{}

	if len(allInstalledFiles) > 0 {
	name := ctx.ModuleName() + "-install"
	ctx.Build(pctx, blueprint.BuildParams{
	Rule: blueprint.Phony,
	Outputs: []string{name},
	Implicits: allInstalledFiles.Strings(),
	Optional: ctx.Config().(Config).EmbeddedInMake(),
	})
	deps = append(deps, name)
	a.installTarget = name
	}

	if len(allCheckbuildFiles) > 0 {
	name := ctx.ModuleName() + "-checkbuild"
	ctx.Build(pctx, blueprint.BuildParams{
	Rule: blueprint.Phony,
	Outputs: []string{name},
	Implicits: allCheckbuildFiles.Strings(),
	Optional: true,
	})
	deps = append(deps, name)
	a.checkbuildTarget = name
	}

	if len(deps) > 0 {
	suffix := ""
	if ctx.Config().(Config).EmbeddedInMake() {
	suffix = "-soong"
	}

	ctx.Build(pctx, blueprint.BuildParams{
	Rule: blueprint.Phony,
	Outputs: []string{ctx.ModuleName() + suffix},
	Implicits: deps,
	Optional: true,
	})

	a.blueprintDir = ctx.ModuleDir()
	}
	}

	func (a *AndroidModuleBase) androidBaseContextFactory(ctx blueprint.BaseModuleContext) androidBaseContextImpl {
	return androidBaseContextImpl{
	arch: a.commonProperties.CompileArch,
	hod: a.commonProperties.CompileHostOrDevice,
	ht: a.commonProperties.CompileHostType,
	proprietary: a.commonProperties.Proprietary,
	config: ctx.Config().(Config),
	installInData: a.module.InstallInData(),
	}
	}

	func (a *AndroidModuleBase) GenerateBuildActions(ctx blueprint.ModuleContext) {
	androidCtx := &androidModuleContext{
	ModuleContext: ctx,
	androidBaseContextImpl: a.androidBaseContextFactory(ctx),
	installDeps: a.computeInstallDeps(ctx),
	installFiles: a.installFiles,
	missingDeps: ctx.GetMissingDependencies(),
	}

	if !a.Enabled() {
	return
	}

	a.module.GenerateAndroidBuildActions(androidCtx)
	if ctx.Failed() {
	return
	}

	a.installFiles = append(a.installFiles, androidCtx.installFiles...)
	a.checkbuildFiles = append(a.checkbuildFiles, androidCtx.checkbuildFiles...)

	a.generateModuleTarget(ctx)
	if ctx.Failed() {
	return
	}
	}

	type androidBaseContextImpl struct {
	arch Arch
	hod HostOrDevice
	ht HostType
	debug bool
	config Config
	proprietary bool
	installInData bool
	}

	type androidModuleContext struct {
	blueprint.ModuleContext
	androidBaseContextImpl
	installDeps Paths
	installFiles Paths
	checkbuildFiles Paths
	missingDeps []string
	}

	func (a *androidModuleContext) ninjaError(outputs []string, err error) {
	a.ModuleContext.Build(pctx, blueprint.BuildParams{
	Rule: ErrorRule,
	Outputs: outputs,
	Optional: true,
	Args: map[string]string{
	"error": err.Error(),
	},
	})
	return
	}

	func (a *androidModuleContext) Build(pctx blueprint.PackageContext, params blueprint.BuildParams) {
	if a.missingDeps != nil {
	a.ninjaError(params.Outputs, fmt.Errorf("module %s missing dependencies: %s\n",
	a.ModuleName(), strings.Join(a.missingDeps, ", ")))
	return
	}

	params.Optional = true
	a.ModuleContext.Build(pctx, params)
	}

	func (a *androidModuleContext) ModuleBuild(pctx blueprint.PackageContext, params ModuleBuildParams) {
	bparams := blueprint.BuildParams{
	Rule: params.Rule,
	Outputs: params.Outputs.Strings(),
	Inputs: params.Inputs.Strings(),
	Implicits: params.Implicits.Strings(),
	OrderOnly: params.OrderOnly.Strings(),
	Args: params.Args,
	Optional: !params.Default,
	}

	if params.Output != nil {
	bparams.Outputs = append(bparams.Outputs, params.Output.String())
	}
	if params.Input != nil {
	bparams.Inputs = append(bparams.Inputs, params.Input.String())
	}
	if params.Implicit != nil {
	bparams.Implicits = append(bparams.Implicits, params.Implicit.String())
	}

	if a.missingDeps != nil {
	a.ninjaError(bparams.Outputs, fmt.Errorf("module %s missing dependencies: %s\n",
	a.ModuleName(), strings.Join(a.missingDeps, ", ")))
	return
	}

	a.ModuleContext.Build(pctx, bparams)
	}

	func (a *androidModuleContext) GetMissingDependencies() []string {
	return a.missingDeps
	}

	func (a *androidBaseContextImpl) Arch() Arch {
	return a.arch
	}

	func (a *androidBaseContextImpl) HostOrDevice() HostOrDevice {
	return a.hod
	}

	func (a *androidBaseContextImpl) HostType() HostType {
	return a.ht
	}

	func (a *androidBaseContextImpl) Host() bool {
	return a.hod.Host()
	}

	func (a *androidBaseContextImpl) Device() bool {
	return a.hod.Device()
	}

	func (a *androidBaseContextImpl) Darwin() bool {
	return a.hod.Host() && a.ht == Darwin
	}

	func (a *androidBaseContextImpl) Debug() bool {
	return a.debug
	}

	func (a *androidBaseContextImpl) AConfig() Config {
	return a.config
	}

	func (a *androidBaseContextImpl) Proprietary() bool {
	return a.proprietary
	}

	func (a *androidBaseContextImpl) InstallInData() bool {
	return a.installInData
	}

	func (a *androidModuleContext) InstallFileName(installPath OutputPath, name string, srcPath Path,
	deps ...Path) Path {

	fullInstallPath := installPath.Join(a, name)

	if a.Host() \|\| !a.AConfig().SkipDeviceInstall() {
	deps = append(deps, a.installDeps...)

	a.ModuleBuild(pctx, ModuleBuildParams{
	Rule: Cp,
	Output: fullInstallPath,
	Input: srcPath,
	OrderOnly: Paths(deps),
	Default: !a.AConfig().EmbeddedInMake(),
	})

	a.installFiles = append(a.installFiles, fullInstallPath)
	}
	a.checkbuildFiles = append(a.checkbuildFiles, srcPath)
	return fullInstallPath
	}

	func (a *androidModuleContext) InstallFile(installPath OutputPath, srcPath Path, deps ...Path) Path {
	return a.InstallFileName(installPath, filepath.Base(srcPath.String()), srcPath, deps...)
	}

	func (a *androidModuleContext) CheckbuildFile(srcPath Path) {
	a.checkbuildFiles = append(a.checkbuildFiles, srcPath)
	}

	type fileInstaller interface {
	filesToInstall() Paths
	}

	func isFileInstaller(m blueprint.Module) bool {
	_, ok := m.(fileInstaller)
	return ok
	}

	func isAndroidModule(m blueprint.Module) bool {
	_, ok := m.(AndroidModule)
	return ok
	}

	func findStringInSlice(str string, slice []string) int {
	for i, s := range slice {
	if s == str {
	return i
	}
	}
	return -1
	}

	func (ctx *androidModuleContext) ExpandSources(srcFiles, excludes []string) Paths {
	prefix := PathForModuleSrc(ctx).String()
	for i, e := range excludes {
	j := findStringInSlice(e, srcFiles)
	if j != -1 {
	srcFiles = append(srcFiles[:j], srcFiles[j+1:]...)
	}

	excludes[i] = filepath.Join(prefix, e)
	}

	globbedSrcFiles := make(Paths, 0, len(srcFiles))
	for _, s := range srcFiles {
	if glob.IsGlob(s) {
	globbedSrcFiles = append(globbedSrcFiles, ctx.Glob("src_glob", filepath.Join(prefix, s), excludes)...)
	} else {
	globbedSrcFiles = append(globbedSrcFiles, PathForModuleSrc(ctx, s))
	}
	}

	return globbedSrcFiles
	}

	func (ctx *androidModuleContext) Glob(outDir, globPattern string, excludes []string) Paths {
	ret, err := Glob(ctx, PathForModuleOut(ctx, outDir).String(), globPattern, excludes)
	if err != nil {
	ctx.ModuleErrorf("glob: %s", err.Error())
	}
	return pathsForModuleSrcFromFullPath(ctx, ret)
	}

	func init() {
	soong.RegisterSingletonType("buildtarget", BuildTargetSingleton)
	}

	func BuildTargetSingleton() blueprint.Singleton {
	return &buildTargetSingleton{}
	}

	type buildTargetSingleton struct{}

	func (c *buildTargetSingleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
	checkbuildDeps := []string{}

	dirModules := make(map[string][]string)

	ctx.VisitAllModules(func(module blueprint.Module) {
	if a, ok := module.(AndroidModule); ok {
	blueprintDir := a.base().blueprintDir
	installTarget := a.base().installTarget
	checkbuildTarget := a.base().checkbuildTarget

	if checkbuildTarget != "" {
	checkbuildDeps = append(checkbuildDeps, checkbuildTarget)
	dirModules[blueprintDir] = append(dirModules[blueprintDir], checkbuildTarget)
	}

	if installTarget != "" {
	dirModules[blueprintDir] = append(dirModules[blueprintDir], installTarget)
	}
	}
	})

	suffix := ""
	if ctx.Config().(Config).EmbeddedInMake() {
	suffix = "-soong"
	}

	// Create a top-level checkbuild target that depends on all modules
	ctx.Build(pctx, blueprint.BuildParams{
	Rule: blueprint.Phony,
	Outputs: []string{"checkbuild" + suffix},
	Implicits: checkbuildDeps,
	Optional: true,
	})

	// Create a mm/<directory> target that depends on all modules in a directory
	dirs := sortedKeys(dirModules)
	for _, dir := range dirs {
	ctx.Build(pctx, blueprint.BuildParams{
	Rule: blueprint.Phony,
	Outputs: []string{filepath.Join("mm", dir)},
	Implicits: dirModules[dir],
	// HACK: checkbuild should be an optional build, but force it
	// enabled for now in standalone builds
	Optional: ctx.Config().(Config).EmbeddedInMake(),
	})
	}
	}

	type AndroidModulesByName struct {
	slice []AndroidModule
	ctx interface {
	ModuleName(blueprint.Module) string
	ModuleSubDir(blueprint.Module) string
	}
	}

	func (s AndroidModulesByName) Len() int { return len(s.slice) }
	func (s AndroidModulesByName) Less(i, j int) bool {
	mi, mj := s.slice[i], s.slice[j]
	ni, nj := s.ctx.ModuleName(mi), s.ctx.ModuleName(mj)

	if ni != nj {
	return ni < nj
	} else {
	return s.ctx.ModuleSubDir(mi) < s.ctx.ModuleSubDir(mj)
	}
	}
	func (s AndroidModulesByName) Swap(i, j int) { s.slice[i], s.slice[j] = s.slice[j], s.slice[i] }