android/module.go

// 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 android

import (
	"fmt"
	"os"
	"path"
	"path/filepath"
	"regexp"
	"strings"
	"text/scanner"

	"github.com/google/blueprint"
	"github.com/google/blueprint/proptools"
)

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

type BuildParams struct {
	Rule            blueprint.Rule
	Deps            blueprint.Deps
	Depfile         WritablePath
	Description     string
	Output          WritablePath
	Outputs         WritablePaths
	ImplicitOutput  WritablePath
	ImplicitOutputs WritablePaths
	Input           Path
	Inputs          Paths
	Implicit        Path
	Implicits       Paths
	OrderOnly       Paths
	Validation      Path
	Validations     Paths
	Default         bool
	Args            map[string]string
}

type ModuleBuildParams BuildParams

// EarlyModuleContext provides methods that can be called early, as soon as the properties have
// been parsed into the module and before any mutators have run.
type EarlyModuleContext interface {
	Module() Module
	ModuleName() string
	ModuleDir() string
	ModuleType() string
	BlueprintsFile() string

	ContainsProperty(name string) bool
	Errorf(pos scanner.Position, fmt string, args ...interface{})
	ModuleErrorf(fmt string, args ...interface{})
	PropertyErrorf(property, fmt string, args ...interface{})
	Failed() bool

	AddNinjaFileDeps(deps ...string)

	DeviceSpecific() bool
	SocSpecific() bool
	ProductSpecific() bool
	SystemExtSpecific() bool
	Platform() bool

	Config() Config
	DeviceConfig() DeviceConfig

	// Deprecated: use Config()
	AConfig() Config

	// GlobWithDeps returns a list of files that match the specified pattern but do not match any
	// of the patterns in excludes.  It also adds efficient dependencies to rerun the primary
	// builder whenever a file matching the pattern as added or removed, without rerunning if a
	// file that does not match the pattern is added to a searched directory.
	GlobWithDeps(pattern string, excludes []string) ([]string, error)

	Glob(globPattern string, excludes []string) Paths
	GlobFiles(globPattern string, excludes []string) Paths
	IsSymlink(path Path) bool
	Readlink(path Path) string

	Namespace() *Namespace
}

// BaseModuleContext is the same as blueprint.BaseModuleContext except that Config() returns
// a Config instead of an interface{}, and some methods have been wrapped to use an android.Module
// instead of a blueprint.Module, plus some extra methods that return Android-specific information
// about the current module.
type BaseModuleContext interface {
	EarlyModuleContext

	blueprintBaseModuleContext() blueprint.BaseModuleContext

	OtherModuleName(m blueprint.Module) string
	OtherModuleDir(m blueprint.Module) string
	OtherModuleErrorf(m blueprint.Module, fmt string, args ...interface{})
	OtherModuleDependencyTag(m blueprint.Module) blueprint.DependencyTag
	OtherModuleExists(name string) bool
	OtherModuleDependencyVariantExists(variations []blueprint.Variation, name string) bool
	OtherModuleReverseDependencyVariantExists(name string) bool
	OtherModuleType(m blueprint.Module) string

	GetDirectDepsWithTag(tag blueprint.DependencyTag) []Module
	GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module
	GetDirectDep(name string) (blueprint.Module, blueprint.DependencyTag)

	VisitDirectDepsBlueprint(visit func(blueprint.Module))
	VisitDirectDeps(visit func(Module))
	VisitDirectDepsWithTag(tag blueprint.DependencyTag, visit func(Module))
	VisitDirectDepsIf(pred func(Module) bool, visit func(Module))
	// Deprecated: use WalkDeps instead to support multiple dependency tags on the same module
	VisitDepsDepthFirst(visit func(Module))
	// Deprecated: use WalkDeps instead to support multiple dependency tags on the same module
	VisitDepsDepthFirstIf(pred func(Module) bool, visit func(Module))
	WalkDeps(visit func(Module, Module) bool)
	WalkDepsBlueprint(visit func(blueprint.Module, blueprint.Module) bool)
	// GetWalkPath is supposed to be called in visit function passed in WalkDeps()
	// and returns a top-down dependency path from a start module to current child module.
	GetWalkPath() []Module

	// GetTagPath is supposed to be called in visit function passed in WalkDeps()
	// and returns a top-down dependency tags path from a start module to current child module.
	// It has one less entry than GetWalkPath() as it contains the dependency tags that
	// exist between each adjacent pair of modules in the GetWalkPath().
	// GetTagPath()[i] is the tag between GetWalkPath()[i] and GetWalkPath()[i+1]
	GetTagPath() []blueprint.DependencyTag

	// GetPathString is supposed to be called in visit function passed in WalkDeps()
	// and returns a multi-line string showing the modules and dependency tags
	// among them along the top-down dependency path from a start module to current child module.
	// skipFirst when set to true, the output doesn't include the start module,
	// which is already printed when this function is used along with ModuleErrorf().
	GetPathString(skipFirst bool) string

	AddMissingDependencies(missingDeps []string)

	Target() Target
	TargetPrimary() bool

	// The additional arch specific targets (e.g. 32/64 bit) that this module variant is
	// responsible for creating.
	MultiTargets() []Target
	Arch() Arch
	Os() OsType
	Host() bool
	Device() bool
	Darwin() bool
	Fuchsia() bool
	Windows() bool
	Debug() bool
	PrimaryArch() bool
}

// Deprecated: use EarlyModuleContext instead
type BaseContext interface {
	EarlyModuleContext
}

type ModuleContext interface {
	BaseModuleContext

	// Deprecated: use ModuleContext.Build instead.
	ModuleBuild(pctx PackageContext, params ModuleBuildParams)

	ExpandSources(srcFiles, excludes []string) Paths
	ExpandSource(srcFile, prop string) Path
	ExpandOptionalSource(srcFile *string, prop string) OptionalPath

	InstallExecutable(installPath InstallPath, name string, srcPath Path, deps ...Path) InstallPath
	InstallFile(installPath InstallPath, name string, srcPath Path, deps ...Path) InstallPath
	InstallSymlink(installPath InstallPath, name string, srcPath InstallPath) InstallPath
	InstallAbsoluteSymlink(installPath InstallPath, name string, absPath string) InstallPath
	CheckbuildFile(srcPath Path)

	InstallInData() bool
	InstallInTestcases() bool
	InstallInSanitizerDir() bool
	InstallInRamdisk() bool
	InstallInRecovery() bool
	InstallInRoot() bool
	InstallBypassMake() bool
	InstallForceOS() (*OsType, *ArchType)

	RequiredModuleNames() []string
	HostRequiredModuleNames() []string
	TargetRequiredModuleNames() []string

	ModuleSubDir() string

	Variable(pctx PackageContext, name, value string)
	Rule(pctx PackageContext, name string, params blueprint.RuleParams, argNames ...string) blueprint.Rule
	// Similar to blueprint.ModuleContext.Build, but takes Paths instead of []string,
	// and performs more verification.
	Build(pctx PackageContext, params BuildParams)
	// Phony creates a Make-style phony rule, a rule with no commands that can depend on other
	// phony rules or real files.  Phony can be called on the same name multiple times to add
	// additional dependencies.
	Phony(phony string, deps ...Path)

	PrimaryModule() Module
	FinalModule() Module
	VisitAllModuleVariants(visit func(Module))

	GetMissingDependencies() []string
}

type Module interface {
	blueprint.Module

	// GenerateAndroidBuildActions is analogous to Blueprints' GenerateBuildActions,
	// but GenerateAndroidBuildActions also has access to Android-specific information.
	// For more information, see Module.GenerateBuildActions within Blueprint's module_ctx.go
	GenerateAndroidBuildActions(ModuleContext)

	// Add dependencies to the components of a module, i.e. modules that are created
	// by the module and which are considered to be part of the creating module.
	//
	// This is called before prebuilts are renamed so as to allow a dependency to be
	// added directly to a prebuilt child module instead of depending on a source module
	// and relying on prebuilt processing to switch to the prebuilt module if preferred.
	//
	// A dependency on a prebuilt must include the "prebuilt_" prefix.
	ComponentDepsMutator(ctx BottomUpMutatorContext)

	DepsMutator(BottomUpMutatorContext)

	base() *ModuleBase
	Disable()
	Enabled() bool
	Target() Target
	InstallInData() bool
	InstallInTestcases() bool
	InstallInSanitizerDir() bool
	InstallInRamdisk() bool
	InstallInRecovery() bool
	InstallInRoot() bool
	InstallBypassMake() bool
	InstallForceOS() (*OsType, *ArchType)
	SkipInstall()
	IsSkipInstall() bool
	MakeUninstallable()
	ReplacedByPrebuilt()
	IsReplacedByPrebuilt() bool
	ExportedToMake() bool
	InitRc() Paths
	VintfFragments() Paths
	NoticeFiles() Paths

	AddProperties(props ...interface{})
	GetProperties() []interface{}

	BuildParamsForTests() []BuildParams
	RuleParamsForTests() map[blueprint.Rule]blueprint.RuleParams
	VariablesForTests() map[string]string

	// String returns a string that includes the module name and variants for printing during debugging.
	String() string

	// Get the qualified module id for this module.
	qualifiedModuleId(ctx BaseModuleContext) qualifiedModuleName

	// Get information about the properties that can contain visibility rules.
	visibilityProperties() []visibilityProperty

	RequiredModuleNames() []string
	HostRequiredModuleNames() []string
	TargetRequiredModuleNames() []string

	filesToInstall() InstallPaths
}

// Qualified id for a module
type qualifiedModuleName struct {
	// The package (i.e. directory) in which the module is defined, without trailing /
	pkg string

	// The name of the module, empty string if package.
	name string
}

func (q qualifiedModuleName) String() string {
	if q.name == "" {
		return "//" + q.pkg
	}
	return "//" + q.pkg + ":" + q.name
}

func (q qualifiedModuleName) isRootPackage() bool {
	return q.pkg == "" && q.name == ""
}

// Get the id for the package containing this module.
func (q qualifiedModuleName) getContainingPackageId() qualifiedModuleName {
	pkg := q.pkg
	if q.name == "" {
		if pkg == "" {
			panic(fmt.Errorf("Cannot get containing package id of root package"))
		}

		index := strings.LastIndex(pkg, "/")
		if index == -1 {
			pkg = ""
		} else {
			pkg = pkg[:index]
		}
	}
	return newPackageId(pkg)
}

func newPackageId(pkg string) qualifiedModuleName {
	// A qualified id for a package module has no name.
	return qualifiedModuleName{pkg: pkg, name: ""}
}

type Dist struct {
	// Copy the output of this module to the $DIST_DIR when `dist` is specified on the
	// command line and any of these targets are also on the command line, or otherwise
	// built
	Targets []string `android:"arch_variant"`

	// The name of the output artifact. This defaults to the basename of the output of
	// the module.
	Dest *string `android:"arch_variant"`

	// The directory within the dist directory to store the artifact. Defaults to the
	// top level directory ("").
	Dir *string `android:"arch_variant"`

	// A suffix to add to the artifact file name (before any extension).
	Suffix *string `android:"arch_variant"`

	// A string tag to select the OutputFiles associated with the tag. Defaults to the
	// the empty "" string.
	Tag *string `android:"arch_variant"`
}

type nameProperties struct {
	// The name of the module.  Must be unique across all modules.
	Name *string
}

type commonProperties struct {
	// emit build rules for this module
	//
	// Disabling a module should only be done for those modules that cannot be built
	// in the current environment. Modules that can build in the current environment
	// but are not usually required (e.g. superceded by a prebuilt) should not be
	// disabled as that will prevent them from being built by the checkbuild target
	// and so prevent early detection of changes that have broken those modules.
	Enabled *bool `android:"arch_variant"`

	// Controls the visibility of this module to other modules. Allowable values are one or more of
	// these formats:
	//
	//  ["//visibility:public"]: Anyone can use this module.
	//  ["//visibility:private"]: Only rules in the module's package (not its subpackages) can use
	//      this module.
	//  ["//visibility:override"]: Discards any rules inherited from defaults or a creating module.
	//      Can only be used at the beginning of a list of visibility rules.
	//  ["//some/package:__pkg__", "//other/package:__pkg__"]: Only modules in some/package and
	//      other/package (defined in some/package/*.bp and other/package/*.bp) have access to
	//      this module. Note that sub-packages do not have access to the rule; for example,
	//      //some/package/foo:bar or //other/package/testing:bla wouldn't have access. __pkg__
	//      is a special module and must be used verbatim. It represents all of the modules in the
	//      package.
	//  ["//project:__subpackages__", "//other:__subpackages__"]: Only modules in packages project
	//      or other or in one of their sub-packages have access to this module. For example,
	//      //project:rule, //project/library:lib or //other/testing/internal:munge are allowed
	//      to depend on this rule (but not //independent:evil)
	//  ["//project"]: This is shorthand for ["//project:__pkg__"]
	//  [":__subpackages__"]: This is shorthand for ["//project:__subpackages__"] where
	//      //project is the module's package. e.g. using [":__subpackages__"] in
	//      packages/apps/Settings/Android.bp is equivalent to
	//      //packages/apps/Settings:__subpackages__.
	//  ["//visibility:legacy_public"]: The default visibility, behaves as //visibility:public
	//      for now. It is an error if it is used in a module.
	//
	// If a module does not specify the `visibility` property then it uses the
	// `default_visibility` property of the `package` module in the module's package.
	//
	// If the `default_visibility` property is not set for the module's package then
	// it will use the `default_visibility` of its closest ancestor package for which
	// a `default_visibility` property is specified.
	//
	// If no `default_visibility` property can be found then the module uses the
	// global default of `//visibility:legacy_public`.
	//
	// The `visibility` property has no effect on a defaults module although it does
	// apply to any non-defaults module that uses it. To set the visibility of a
	// defaults module, use the `defaults_visibility` property on the defaults module;
	// not to be confused with the `default_visibility` property on the package module.
	//
	// See https://android.googlesource.com/platform/build/soong/+/master/README.md#visibility for
	// more details.
	Visibility []string

	// 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 `android:"arch_variant"`

	Target struct {
		Host struct {
			Compile_multilib *string
		}
		Android struct {
			Compile_multilib *string
		}
	}

	// If set to true then the archMutator will create variants for each arch specific target
	// (e.g. 32/64) that the module is required to produce. If set to false then it will only
	// create a variant for the architecture and will list the additional arch specific targets
	// that the variant needs to produce in the CompileMultiTargets property.
	UseTargetVariants bool   `blueprint:"mutated"`
	Default_multilib  string `blueprint:"mutated"`

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

	// vendor who owns this module
	Owner *string

	// whether this module is specific to an SoC (System-On-a-Chip). When set to true,
	// it is installed into /vendor (or /system/vendor if vendor partition does not exist).
	// Use `soc_specific` instead for better meaning.
	Vendor *bool

	// whether this module is specific to an SoC (System-On-a-Chip). When set to true,
	// it is installed into /vendor (or /system/vendor if vendor partition does not exist).
	Soc_specific *bool

	// whether this module is specific to a device, not only for SoC, but also for off-chip
	// peripherals. When set to true, it is installed into /odm (or /vendor/odm if odm partition
	// does not exist, or /system/vendor/odm if both odm and vendor partitions do not exist).
	// This implies `soc_specific:true`.
	Device_specific *bool

	// whether this module is specific to a software configuration of a product (e.g. country,
	// network operator, etc). When set to true, it is installed into /product (or
	// /system/product if product partition does not exist).
	Product_specific *bool

	// whether this module extends system. When set to true, it is installed into /system_ext
	// (or /system/system_ext if system_ext partition does not exist).
	System_ext_specific *bool

	// Whether this module is installed to recovery partition
	Recovery *bool

	// Whether this module is installed to ramdisk
	Ramdisk *bool

	// Whether this module is built for non-native architecures (also known as native bridge binary)
	Native_bridge_supported *bool `android:"arch_variant"`

	// init.rc files to be installed if this module is installed
	Init_rc []string `android:"path"`

	// VINTF manifest fragments to be installed if this module is installed
	Vintf_fragments []string `android:"path"`

	// names of other modules to install if this module is installed
	Required []string `android:"arch_variant"`

	// names of other modules to install on host if this module is installed
	Host_required []string `android:"arch_variant"`

	// names of other modules to install on target if this module is installed
	Target_required []string `android:"arch_variant"`

	// relative path to a file to include in the list of notices for the device
	Notice *string `android:"path"`

	// The OsType of artifacts that this module variant is responsible for creating.
	//
	// Set by osMutator
	CompileOS OsType `blueprint:"mutated"`

	// The Target of artifacts that this module variant is responsible for creating.
	//
	// Set by archMutator
	CompileTarget Target `blueprint:"mutated"`

	// The additional arch specific targets (e.g. 32/64 bit) that this module variant is
	// responsible for creating.
	//
	// By default this is nil as, where necessary, separate variants are created for the
	// different multilib types supported and that information is encapsulated in the
	// CompileTarget so the module variant simply needs to create artifacts for that.
	//
	// However, if UseTargetVariants is set to false (e.g. by
	// InitAndroidMultiTargetsArchModule)  then no separate variants are created for the
	// multilib targets. Instead a single variant is created for the architecture and
	// this contains the multilib specific targets that this variant should create.
	//
	// Set by archMutator
	CompileMultiTargets []Target `blueprint:"mutated"`

	// True if the module variant's CompileTarget is the primary target
	//
	// Set by archMutator
	CompilePrimary bool `blueprint:"mutated"`

	// Set by InitAndroidModule
	HostOrDeviceSupported HostOrDeviceSupported `blueprint:"mutated"`
	ArchSpecific          bool                  `blueprint:"mutated"`

	// If set to true then a CommonOS variant will be created which will have dependencies
	// on all its OsType specific variants. Used by sdk/module_exports to create a snapshot
	// that covers all os and architecture variants.
	//
	// The OsType specific variants can be retrieved by calling
	// GetOsSpecificVariantsOfCommonOSVariant
	//
	// Set at module initialization time by calling InitCommonOSAndroidMultiTargetsArchModule
	CreateCommonOSVariant bool `blueprint:"mutated"`

	// If set to true then this variant is the CommonOS variant that has dependencies on its
	// OsType specific variants.
	//
	// Set by osMutator.
	CommonOSVariant bool `blueprint:"mutated"`

	SkipInstall bool `blueprint:"mutated"`

	// Whether the module has been replaced by a prebuilt
	ReplacedByPrebuilt bool `blueprint:"mutated"`

	// Disabled by mutators. If set to true, it overrides Enabled property.
	ForcedDisabled bool `blueprint:"mutated"`

	NamespaceExportedToMake bool `blueprint:"mutated"`

	MissingDeps []string `blueprint:"mutated"`

	// Name and variant strings stored by mutators to enable Module.String()
	DebugName       string   `blueprint:"mutated"`
	DebugMutators   []string `blueprint:"mutated"`
	DebugVariations []string `blueprint:"mutated"`

	// set by ImageMutator
	ImageVariation string `blueprint:"mutated"`
}

type distProperties struct {
	// configuration to distribute output files from this module to the distribution
	// directory (default: $OUT/dist, configurable with $DIST_DIR)
	Dist Dist `android:"arch_variant"`

	// a list of configurations to distribute output files from this module to the
	// distribution directory (default: $OUT/dist, configurable with $DIST_DIR)
	Dists []Dist `android:"arch_variant"`
}

// A map of OutputFile tag keys to Paths, for disting purposes.
type TaggedDistFiles map[string]Paths

func MakeDefaultDistFiles(paths ...Path) TaggedDistFiles {
	for _, path := range paths {
		if path == nil {
			panic("The path to a dist file cannot be nil.")
		}
	}

	// The default OutputFile tag is the empty "" string.
	return TaggedDistFiles{"": paths}
}

type hostAndDeviceProperties struct {
	// If set to true, build a variant of the module for the host.  Defaults to false.
	Host_supported *bool

	// If set to true, build a variant of the module for the device.  Defaults to true.
	Device_supported *bool
}

type Multilib string

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

type HostOrDeviceSupported int

const (
	_ HostOrDeviceSupported = iota

	// Host and HostCross are built by default. Device is not supported.
	HostSupported

	// Host is built by default. HostCross and Device are not supported.
	HostSupportedNoCross

	// Device is built by default. Host and HostCross are not supported.
	DeviceSupported

	// Device is built by default. Host and HostCross are supported.
	HostAndDeviceSupported

	// Host, HostCross, and Device are built by default.
	HostAndDeviceDefault

	// Nothing is supported. This is not exposed to the user, but used to mark a
	// host only module as unsupported when the module type is not supported on
	// the host OS. E.g. benchmarks are supported on Linux but not Darwin.
	NeitherHostNorDeviceSupported
)

type moduleKind int

const (
	platformModule moduleKind = iota
	deviceSpecificModule
	socSpecificModule
	productSpecificModule
	systemExtSpecificModule
)

func (k moduleKind) String() string {
	switch k {
	case platformModule:
		return "platform"
	case deviceSpecificModule:
		return "device-specific"
	case socSpecificModule:
		return "soc-specific"
	case productSpecificModule:
		return "product-specific"
	case systemExtSpecificModule:
		return "systemext-specific"
	default:
		panic(fmt.Errorf("unknown module kind %d", k))
	}
}

func initAndroidModuleBase(m Module) {
	m.base().module = m
}

func InitAndroidModule(m Module) {
	initAndroidModuleBase(m)
	base := m.base()

	m.AddProperties(
		&base.nameProperties,
		&base.commonProperties,
		&base.distProperties)

	initProductVariableModule(m)

	base.generalProperties = m.GetProperties()
	base.customizableProperties = m.GetProperties()

	// The default_visibility property needs to be checked and parsed by the visibility module during
	// its checking and parsing phases so make it the primary visibility property.
	setPrimaryVisibilityProperty(m, "visibility", &base.commonProperties.Visibility)
}

func InitAndroidArchModule(m Module, hod HostOrDeviceSupported, defaultMultilib Multilib) {
	InitAndroidModule(m)

	base := m.base()
	base.commonProperties.HostOrDeviceSupported = hod
	base.commonProperties.Default_multilib = string(defaultMultilib)
	base.commonProperties.ArchSpecific = true
	base.commonProperties.UseTargetVariants = true

	switch hod {
	case HostAndDeviceSupported, HostAndDeviceDefault:
		m.AddProperties(&base.hostAndDeviceProperties)
	}

	InitArchModule(m)
}

func InitAndroidMultiTargetsArchModule(m Module, hod HostOrDeviceSupported, defaultMultilib Multilib) {
	InitAndroidArchModule(m, hod, defaultMultilib)
	m.base().commonProperties.UseTargetVariants = false
}

// As InitAndroidMultiTargetsArchModule except it creates an additional CommonOS variant that
// has dependencies on all the OsType specific variants.
func InitCommonOSAndroidMultiTargetsArchModule(m Module, hod HostOrDeviceSupported, defaultMultilib Multilib) {
	InitAndroidArchModule(m, hod, defaultMultilib)
	m.base().commonProperties.UseTargetVariants = false
	m.base().commonProperties.CreateCommonOSVariant = true
}

// A ModuleBase 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 ModuleBase 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 ModuleContext
// rather than the usual blueprint.ModuleContext.
// ModuleContext 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/android"
//     )
//
//     type myModule struct {
//         android.ModuleBase
//         properties struct {
//             MyProperty string
//         }
//     }
//
//     func NewMyModule() android.Module) {
//         m := &myModule{}
//         m.AddProperties(&m.properties)
//         android.InitAndroidModule(m)
//         return m
//     }
//
//     func (m *myModule) GenerateAndroidBuildActions(ctx android.ModuleContext) {
//         // Get the CPU architecture for the current build variant.
//         variantArch := ctx.Arch()
//
//         // ...
//     }
type ModuleBase struct {
	// Putting the curiously recurring thing pointing to the thing that contains
	// the thing pattern to good use.
	// TODO: remove this
	module Module

	nameProperties          nameProperties
	commonProperties        commonProperties
	distProperties          distProperties
	variableProperties      interface{}
	hostAndDeviceProperties hostAndDeviceProperties
	generalProperties       []interface{}
	archProperties          [][]interface{}
	customizableProperties  []interface{}

	// Information about all the properties on the module that contains visibility rules that need
	// checking.
	visibilityPropertyInfo []visibilityProperty

	// The primary visibility property, may be nil, that controls access to the module.
	primaryVisibilityProperty visibilityProperty

	noAddressSanitizer bool
	installFiles       InstallPaths
	checkbuildFiles    Paths
	noticeFiles        Paths
	phonies            map[string]Paths

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

	hooks hooks

	registerProps []interface{}

	// For tests
	buildParams []BuildParams
	ruleParams  map[blueprint.Rule]blueprint.RuleParams
	variables   map[string]string

	initRcPaths         Paths
	vintfFragmentsPaths Paths

	prefer32 func(ctx BaseModuleContext, base *ModuleBase, class OsClass) bool
}

func (m *ModuleBase) ComponentDepsMutator(BottomUpMutatorContext) {}

func (m *ModuleBase) DepsMutator(BottomUpMutatorContext) {}

func (m *ModuleBase) AddProperties(props ...interface{}) {
	m.registerProps = append(m.registerProps, props...)
}

func (m *ModuleBase) GetProperties() []interface{} {
	return m.registerProps
}

func (m *ModuleBase) BuildParamsForTests() []BuildParams {
	return m.buildParams
}

func (m *ModuleBase) RuleParamsForTests() map[blueprint.Rule]blueprint.RuleParams {
	return m.ruleParams
}

func (m *ModuleBase) VariablesForTests() map[string]string {
	return m.variables
}

func (m *ModuleBase) Prefer32(prefer32 func(ctx BaseModuleContext, base *ModuleBase, class OsClass) bool) {
	m.prefer32 = prefer32
}

// Name returns the name of the module.  It may be overridden by individual module types, for
// example prebuilts will prepend prebuilt_ to the name.
func (m *ModuleBase) Name() string {
	return String(m.nameProperties.Name)
}

// String returns a string that includes the module name and variants for printing during debugging.
func (m *ModuleBase) String() string {
	sb := strings.Builder{}
	sb.WriteString(m.commonProperties.DebugName)
	sb.WriteString("{")
	for i := range m.commonProperties.DebugMutators {
		if i != 0 {
			sb.WriteString(",")
		}
		sb.WriteString(m.commonProperties.DebugMutators[i])
		sb.WriteString(":")
		sb.WriteString(m.commonProperties.DebugVariations[i])
	}
	sb.WriteString("}")
	return sb.String()
}

// BaseModuleName returns the name of the module as specified in the blueprints file.
func (m *ModuleBase) BaseModuleName() string {
	return String(m.nameProperties.Name)
}

func (m *ModuleBase) base() *ModuleBase {
	return m
}

func (m *ModuleBase) qualifiedModuleId(ctx BaseModuleContext) qualifiedModuleName {
	return qualifiedModuleName{pkg: ctx.ModuleDir(), name: ctx.ModuleName()}
}

func (m *ModuleBase) visibilityProperties() []visibilityProperty {
	return m.visibilityPropertyInfo
}

func (m *ModuleBase) Dists() []Dist {
	if len(m.distProperties.Dist.Targets) > 0 {
		// Make a copy of the underlying Dists slice to protect against
		// backing array modifications with repeated calls to this method.
		distsCopy := append([]Dist(nil), m.distProperties.Dists...)
		return append(distsCopy, m.distProperties.Dist)
	} else {
		return m.distProperties.Dists
	}
}

func (m *ModuleBase) GenerateTaggedDistFiles(ctx BaseModuleContext) TaggedDistFiles {
	distFiles := make(TaggedDistFiles)
	for _, dist := range m.Dists() {
		var tag string
		var distFilesForTag Paths
		if dist.Tag == nil {
			tag = ""
		} else {
			tag = *dist.Tag
		}
		distFilesForTag, err := m.base().module.(OutputFileProducer).OutputFiles(tag)
		if err != nil {
			ctx.PropertyErrorf("dist.tag", "%s", err.Error())
		}
		for _, distFile := range distFilesForTag {
			if distFile != nil && !distFiles[tag].containsPath(distFile) {
				distFiles[tag] = append(distFiles[tag], distFile)
			}
		}
	}

	return distFiles
}

func (m *ModuleBase) Target() Target {
	return m.commonProperties.CompileTarget
}

func (m *ModuleBase) TargetPrimary() bool {
	return m.commonProperties.CompilePrimary
}

func (m *ModuleBase) MultiTargets() []Target {
	return m.commonProperties.CompileMultiTargets
}

func (m *ModuleBase) Os() OsType {
	return m.Target().Os
}

func (m *ModuleBase) Host() bool {
	return m.Os().Class == Host || m.Os().Class == HostCross
}

func (m *ModuleBase) Device() bool {
	return m.Os().Class == Device
}

func (m *ModuleBase) Arch() Arch {
	return m.Target().Arch
}

func (m *ModuleBase) ArchSpecific() bool {
	return m.commonProperties.ArchSpecific
}

// True if the current variant is a CommonOS variant, false otherwise.
func (m *ModuleBase) IsCommonOSVariant() bool {
	return m.commonProperties.CommonOSVariant
}

func (m *ModuleBase) OsClassSupported() []OsClass {
	switch m.commonProperties.HostOrDeviceSupported {
	case HostSupported:
		return []OsClass{Host, HostCross}
	case HostSupportedNoCross:
		return []OsClass{Host}
	case DeviceSupported:
		return []OsClass{Device}
	case HostAndDeviceSupported, HostAndDeviceDefault:
		var supported []OsClass
		if Bool(m.hostAndDeviceProperties.Host_supported) ||
			(m.commonProperties.HostOrDeviceSupported == HostAndDeviceDefault &&
				m.hostAndDeviceProperties.Host_supported == nil) {
			supported = append(supported, Host, HostCross)
		}
		if m.hostAndDeviceProperties.Device_supported == nil ||
			*m.hostAndDeviceProperties.Device_supported {
			supported = append(supported, Device)
		}
		return supported
	default:
		return nil
	}
}

func (m *ModuleBase) DeviceSupported() bool {
	return m.commonProperties.HostOrDeviceSupported == DeviceSupported ||
		m.commonProperties.HostOrDeviceSupported == HostAndDeviceSupported &&
			(m.hostAndDeviceProperties.Device_supported == nil ||
				*m.hostAndDeviceProperties.Device_supported)
}

func (m *ModuleBase) HostSupported() bool {
	return m.commonProperties.HostOrDeviceSupported == HostSupported ||
		m.commonProperties.HostOrDeviceSupported == HostAndDeviceSupported &&
			(m.hostAndDeviceProperties.Host_supported != nil &&
				*m.hostAndDeviceProperties.Host_supported)
}

func (m *ModuleBase) Platform() bool {
	return !m.DeviceSpecific() && !m.SocSpecific() && !m.ProductSpecific() && !m.SystemExtSpecific()
}

func (m *ModuleBase) DeviceSpecific() bool {
	return Bool(m.commonProperties.Device_specific)
}

func (m *ModuleBase) SocSpecific() bool {
	return Bool(m.commonProperties.Vendor) || Bool(m.commonProperties.Proprietary) || Bool(m.commonProperties.Soc_specific)
}

func (m *ModuleBase) ProductSpecific() bool {
	return Bool(m.commonProperties.Product_specific)
}

func (m *ModuleBase) SystemExtSpecific() bool {
	return Bool(m.commonProperties.System_ext_specific)
}

// RequiresStableAPIs returns true if the module will be installed to a partition that may
// be updated separately from the system image.
func (m *ModuleBase) RequiresStableAPIs(ctx BaseModuleContext) bool {
	return m.SocSpecific() || m.DeviceSpecific() ||
		(m.ProductSpecific() && ctx.Config().EnforceProductPartitionInterface())
}

func (m *ModuleBase) PartitionTag(config DeviceConfig) string {
	partition := "system"
	if m.SocSpecific() {
		// A SoC-specific module could be on the vendor partition at
		// "vendor" or the system partition at "system/vendor".
		if config.VendorPath() == "vendor" {
			partition = "vendor"
		}
	} else if m.DeviceSpecific() {
		// A device-specific module could be on the odm partition at
		// "odm", the vendor partition at "vendor/odm", or the system
		// partition at "system/vendor/odm".
		if config.OdmPath() == "odm" {
			partition = "odm"
		} else if strings.HasPrefix(config.OdmPath(), "vendor/") {
			partition = "vendor"
		}
	} else if m.ProductSpecific() {
		// A product-specific module could be on the product partition
		// at "product" or the system partition at "system/product".
		if config.ProductPath() == "product" {
			partition = "product"
		}
	} else if m.SystemExtSpecific() {
		// A system_ext-specific module could be on the system_ext
		// partition at "system_ext" or the system partition at
		// "system/system_ext".
		if config.SystemExtPath() == "system_ext" {
			partition = "system_ext"
		}
	}
	return partition
}

func (m *ModuleBase) Enabled() bool {
	if m.commonProperties.ForcedDisabled {
		return false
	}
	if m.commonProperties.Enabled == nil {
		return !m.Os().DefaultDisabled
	}
	return *m.commonProperties.Enabled
}

func (m *ModuleBase) Disable() {
	m.commonProperties.ForcedDisabled = true
}

func (m *ModuleBase) SkipInstall() {
	m.commonProperties.SkipInstall = true
}

func (m *ModuleBase) IsSkipInstall() bool {
	return m.commonProperties.SkipInstall == true
}

// Similar to SkipInstall, but if the AndroidMk entry would set
// LOCAL_UNINSTALLABLE_MODULE then this variant may still output that entry
// rather than leaving it out altogether. That happens in cases where it would
// have other side effects, in particular when it adds a NOTICE file target,
// which other install targets might depend on.
func (m *ModuleBase) MakeUninstallable() {
	m.SkipInstall()
}

func (m *ModuleBase) ReplacedByPrebuilt() {
	m.commonProperties.ReplacedByPrebuilt = true
	m.SkipInstall()
}

func (m *ModuleBase) IsReplacedByPrebuilt() bool {
	return m.commonProperties.ReplacedByPrebuilt
}

func (m *ModuleBase) ExportedToMake() bool {
	return m.commonProperties.NamespaceExportedToMake
}

func (m *ModuleBase) computeInstallDeps(ctx blueprint.ModuleContext) InstallPaths {

	var result InstallPaths
	// TODO(ccross): we need to use WalkDeps and have some way to know which dependencies require installation
	ctx.VisitDepsDepthFirst(func(m blueprint.Module) {
		if a, ok := m.(Module); ok {
			result = append(result, a.filesToInstall()...)
		}
	})

	return result
}

func (m *ModuleBase) filesToInstall() InstallPaths {
	return m.installFiles
}

func (m *ModuleBase) NoAddressSanitizer() bool {
	return m.noAddressSanitizer
}

func (m *ModuleBase) InstallInData() bool {
	return false
}

func (m *ModuleBase) InstallInTestcases() bool {
	return false
}

func (m *ModuleBase) InstallInSanitizerDir() bool {
	return false
}

func (m *ModuleBase) InstallInRamdisk() bool {
	return Bool(m.commonProperties.Ramdisk)
}

func (m *ModuleBase) InstallInRecovery() bool {
	return Bool(m.commonProperties.Recovery)
}

func (m *ModuleBase) InstallInRoot() bool {
	return false
}

func (m *ModuleBase) InstallBypassMake() bool {
	return false
}

func (m *ModuleBase) InstallForceOS() (*OsType, *ArchType) {
	return nil, nil
}

func (m *ModuleBase) Owner() string {
	return String(m.commonProperties.Owner)
}

func (m *ModuleBase) NoticeFiles() Paths {
	return m.noticeFiles
}

func (m *ModuleBase) setImageVariation(variant string) {
	m.commonProperties.ImageVariation = variant
}

func (m *ModuleBase) ImageVariation() blueprint.Variation {
	return blueprint.Variation{
		Mutator:   "image",
		Variation: m.base().commonProperties.ImageVariation,
	}
}

func (m *ModuleBase) getVariationByMutatorName(mutator string) string {
	for i, v := range m.commonProperties.DebugMutators {
		if v == mutator {
			return m.commonProperties.DebugVariations[i]
		}
	}

	return ""
}

func (m *ModuleBase) InRamdisk() bool {
	return m.base().commonProperties.ImageVariation == RamdiskVariation
}

func (m *ModuleBase) InRecovery() bool {
	return m.base().commonProperties.ImageVariation == RecoveryVariation
}

func (m *ModuleBase) RequiredModuleNames() []string {
	return m.base().commonProperties.Required
}

func (m *ModuleBase) HostRequiredModuleNames() []string {
	return m.base().commonProperties.Host_required
}

func (m *ModuleBase) TargetRequiredModuleNames() []string {
	return m.base().commonProperties.Target_required
}

func (m *ModuleBase) InitRc() Paths {
	return append(Paths{}, m.initRcPaths...)
}

func (m *ModuleBase) VintfFragments() Paths {
	return append(Paths{}, m.vintfFragmentsPaths...)
}

func (m *ModuleBase) generateModuleTarget(ctx ModuleContext) {
	var allInstalledFiles InstallPaths
	var allCheckbuildFiles Paths
	ctx.VisitAllModuleVariants(func(module Module) {
		a := module.base()
		allInstalledFiles = append(allInstalledFiles, a.installFiles...)
		allCheckbuildFiles = append(allCheckbuildFiles, a.checkbuildFiles...)
	})

	var deps Paths

	namespacePrefix := ctx.Namespace().id
	if namespacePrefix != "" {
		namespacePrefix = namespacePrefix + "-"
	}

	if len(allInstalledFiles) > 0 {
		name := namespacePrefix + ctx.ModuleName() + "-install"
		ctx.Phony(name, allInstalledFiles.Paths()...)
		m.installTarget = PathForPhony(ctx, name)
		deps = append(deps, m.installTarget)
	}

	if len(allCheckbuildFiles) > 0 {
		name := namespacePrefix + ctx.ModuleName() + "-checkbuild"
		ctx.Phony(name, allCheckbuildFiles...)
		m.checkbuildTarget = PathForPhony(ctx, name)
		deps = append(deps, m.checkbuildTarget)
	}

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

		ctx.Phony(namespacePrefix+ctx.ModuleName()+suffix, deps...)

		m.blueprintDir = ctx.ModuleDir()
	}
}

func determineModuleKind(m *ModuleBase, ctx blueprint.EarlyModuleContext) moduleKind {
	var socSpecific = Bool(m.commonProperties.Vendor) || Bool(m.commonProperties.Proprietary) || Bool(m.commonProperties.Soc_specific)
	var deviceSpecific = Bool(m.commonProperties.Device_specific)
	var productSpecific = Bool(m.commonProperties.Product_specific)
	var systemExtSpecific = Bool(m.commonProperties.System_ext_specific)

	msg := "conflicting value set here"
	if socSpecific && deviceSpecific {
		ctx.PropertyErrorf("device_specific", "a module cannot be specific to SoC and device at the same time.")
		if Bool(m.commonProperties.Vendor) {
			ctx.PropertyErrorf("vendor", msg)
		}
		if Bool(m.commonProperties.Proprietary) {
			ctx.PropertyErrorf("proprietary", msg)
		}
		if Bool(m.commonProperties.Soc_specific) {
			ctx.PropertyErrorf("soc_specific", msg)
		}
	}

	if productSpecific && systemExtSpecific {
		ctx.PropertyErrorf("product_specific", "a module cannot be specific to product and system_ext at the same time.")
		ctx.PropertyErrorf("system_ext_specific", msg)
	}

	if (socSpecific || deviceSpecific) && (productSpecific || systemExtSpecific) {
		if productSpecific {
			ctx.PropertyErrorf("product_specific", "a module cannot be specific to SoC or device and product at the same time.")
		} else {
			ctx.PropertyErrorf("system_ext_specific", "a module cannot be specific to SoC or device and system_ext at the same time.")
		}
		if deviceSpecific {
			ctx.PropertyErrorf("device_specific", msg)
		} else {
			if Bool(m.commonProperties.Vendor) {
				ctx.PropertyErrorf("vendor", msg)
			}
			if Bool(m.commonProperties.Proprietary) {
				ctx.PropertyErrorf("proprietary", msg)
			}
			if Bool(m.commonProperties.Soc_specific) {
				ctx.PropertyErrorf("soc_specific", msg)
			}
		}
	}

	if productSpecific {
		return productSpecificModule
	} else if systemExtSpecific {
		return systemExtSpecificModule
	} else if deviceSpecific {
		return deviceSpecificModule
	} else if socSpecific {
		return socSpecificModule
	} else {
		return platformModule
	}
}

func (m *ModuleBase) earlyModuleContextFactory(ctx blueprint.EarlyModuleContext) earlyModuleContext {
	return earlyModuleContext{
		EarlyModuleContext: ctx,
		kind:               determineModuleKind(m, ctx),
		config:             ctx.Config().(Config),
	}
}

func (m *ModuleBase) baseModuleContextFactory(ctx blueprint.BaseModuleContext) baseModuleContext {
	return baseModuleContext{
		bp:                 ctx,
		earlyModuleContext: m.earlyModuleContextFactory(ctx),
		os:                 m.commonProperties.CompileOS,
		target:             m.commonProperties.CompileTarget,
		targetPrimary:      m.commonProperties.CompilePrimary,
		multiTargets:       m.commonProperties.CompileMultiTargets,
	}
}

func (m *ModuleBase) GenerateBuildActions(blueprintCtx blueprint.ModuleContext) {
	ctx := &moduleContext{
		module:            m.module,
		bp:                blueprintCtx,
		baseModuleContext: m.baseModuleContextFactory(blueprintCtx),
		installDeps:       m.computeInstallDeps(blueprintCtx),
		installFiles:      m.installFiles,
		variables:         make(map[string]string),
	}

	// Temporarily continue to call blueprintCtx.GetMissingDependencies() to maintain the previous behavior of never
	// reporting missing dependency errors in Blueprint when AllowMissingDependencies == true.
	// TODO: This will be removed once defaults modules handle missing dependency errors
	blueprintCtx.GetMissingDependencies()

	// For the final GenerateAndroidBuildActions pass, require that all visited dependencies Soong modules and
	// are enabled. Unless the module is a CommonOS variant which may have dependencies on disabled variants
	// (because the dependencies are added before the modules are disabled). The
	// GetOsSpecificVariantsOfCommonOSVariant(...) method will ensure that the disabled variants are
	// ignored.
	ctx.baseModuleContext.strictVisitDeps = !m.IsCommonOSVariant()

	if ctx.config.captureBuild {
		ctx.ruleParams = make(map[blueprint.Rule]blueprint.RuleParams)
	}

	desc := "//" + ctx.ModuleDir() + ":" + ctx.ModuleName() + " "
	var suffix []string
	if ctx.Os().Class != Device && ctx.Os().Class != Generic {
		suffix = append(suffix, ctx.Os().String())
	}
	if !ctx.PrimaryArch() {
		suffix = append(suffix, ctx.Arch().ArchType.String())
	}
	if apex, ok := m.module.(ApexModule); ok && !apex.IsForPlatform() {
		suffix = append(suffix, apex.ApexVariationName())
	}

	ctx.Variable(pctx, "moduleDesc", desc)

	s := ""
	if len(suffix) > 0 {
		s = " [" + strings.Join(suffix, " ") + "]"
	}
	ctx.Variable(pctx, "moduleDescSuffix", s)

	// Some common property checks for properties that will be used later in androidmk.go
	if m.distProperties.Dist.Dest != nil {
		_, err := validateSafePath(*m.distProperties.Dist.Dest)
		if err != nil {
			ctx.PropertyErrorf("dist.dest", "%s", err.Error())
		}
	}
	if m.distProperties.Dist.Dir != nil {
		_, err := validateSafePath(*m.distProperties.Dist.Dir)
		if err != nil {
			ctx.PropertyErrorf("dist.dir", "%s", err.Error())
		}
	}
	if m.distProperties.Dist.Suffix != nil {
		if strings.Contains(*m.distProperties.Dist.Suffix, "/") {
			ctx.PropertyErrorf("dist.suffix", "Suffix may not contain a '/' character.")
		}
	}

	if m.Enabled() {
		// ensure all direct android.Module deps are enabled
		ctx.VisitDirectDepsBlueprint(func(bm blueprint.Module) {
			if _, ok := bm.(Module); ok {
				ctx.validateAndroidModule(bm, ctx.baseModuleContext.strictVisitDeps)
			}
		})

		m.noticeFiles = make([]Path, 0)
		optPath := OptionalPath{}
		notice := proptools.StringDefault(m.commonProperties.Notice, "")
		if module := SrcIsModule(notice); module != "" {
			optPath = ctx.ExpandOptionalSource(&notice, "notice")
		} else if notice != "" {
			noticePath := filepath.Join(ctx.ModuleDir(), notice)
			optPath = ExistentPathForSource(ctx, noticePath)
		}
		if optPath.Valid() {
			m.noticeFiles = append(m.noticeFiles, optPath.Path())
		} else {
			for _, notice = range []string{"LICENSE", "LICENCE", "NOTICE"} {
				noticePath := filepath.Join(ctx.ModuleDir(), notice)
				optPath = ExistentPathForSource(ctx, noticePath)
				if optPath.Valid() {
					m.noticeFiles = append(m.noticeFiles, optPath.Path())
				}
			}
		}

		m.module.GenerateAndroidBuildActions(ctx)
		if ctx.Failed() {
			return
		}

		m.installFiles = append(m.installFiles, ctx.installFiles...)
		m.checkbuildFiles = append(m.checkbuildFiles, ctx.checkbuildFiles...)
		m.initRcPaths = PathsForModuleSrc(ctx, m.commonProperties.Init_rc)
		m.vintfFragmentsPaths = PathsForModuleSrc(ctx, m.commonProperties.Vintf_fragments)
		for k, v := range ctx.phonies {
			m.phonies[k] = append(m.phonies[k], v...)
		}
	} else if ctx.Config().AllowMissingDependencies() {
		// If the module is not enabled it will not create any build rules, nothing will call
		// ctx.GetMissingDependencies(), and blueprint will consider the missing dependencies to be unhandled
		// and report them as an error even when AllowMissingDependencies = true.  Call
		// ctx.GetMissingDependencies() here to tell blueprint not to handle them.
		ctx.GetMissingDependencies()
	}

	if m == ctx.FinalModule().(Module).base() {
		m.generateModuleTarget(ctx)
		if ctx.Failed() {
			return
		}
	}

	m.buildParams = ctx.buildParams
	m.ruleParams = ctx.ruleParams
	m.variables = ctx.variables
}

type earlyModuleContext struct {
	blueprint.EarlyModuleContext

	kind   moduleKind
	config Config
}

func (e *earlyModuleContext) Glob(globPattern string, excludes []string) Paths {
	ret, err := e.GlobWithDeps(globPattern, excludes)
	if err != nil {
		e.ModuleErrorf("glob: %s", err.Error())
	}
	return pathsForModuleSrcFromFullPath(e, ret, true)
}

func (e *earlyModuleContext) GlobFiles(globPattern string, excludes []string) Paths {
	ret, err := e.GlobWithDeps(globPattern, excludes)
	if err != nil {
		e.ModuleErrorf("glob: %s", err.Error())
	}
	return pathsForModuleSrcFromFullPath(e, ret, false)
}

func (b *earlyModuleContext) IsSymlink(path Path) bool {
	fileInfo, err := b.config.fs.Lstat(path.String())
	if err != nil {
		b.ModuleErrorf("os.Lstat(%q) failed: %s", path.String(), err)
	}
	return fileInfo.Mode()&os.ModeSymlink == os.ModeSymlink
}

func (b *earlyModuleContext) Readlink(path Path) string {
	dest, err := b.config.fs.Readlink(path.String())
	if err != nil {
		b.ModuleErrorf("os.Readlink(%q) failed: %s", path.String(), err)
	}
	return dest
}

func (e *earlyModuleContext) Module() Module {
	module, _ := e.EarlyModuleContext.Module().(Module)
	return module
}

func (e *earlyModuleContext) Config() Config {
	return e.EarlyModuleContext.Config().(Config)
}

func (e *earlyModuleContext) AConfig() Config {
	return e.config
}

func (e *earlyModuleContext) DeviceConfig() DeviceConfig {
	return DeviceConfig{e.config.deviceConfig}
}

func (e *earlyModuleContext) Platform() bool {
	return e.kind == platformModule
}

func (e *earlyModuleContext) DeviceSpecific() bool {
	return e.kind == deviceSpecificModule
}

func (e *earlyModuleContext) SocSpecific() bool {
	return e.kind == socSpecificModule
}

func (e *earlyModuleContext) ProductSpecific() bool {
	return e.kind == productSpecificModule
}

func (e *earlyModuleContext) SystemExtSpecific() bool {
	return e.kind == systemExtSpecificModule
}

func (e *earlyModuleContext) Namespace() *Namespace {
	return e.EarlyModuleContext.Namespace().(*Namespace)
}

type baseModuleContext struct {
	bp blueprint.BaseModuleContext
	earlyModuleContext
	os            OsType
	target        Target
	multiTargets  []Target
	targetPrimary bool
	debug         bool

	walkPath []Module
	tagPath  []blueprint.DependencyTag

	strictVisitDeps bool // If true, enforce that all dependencies are enabled
}

func (b *baseModuleContext) OtherModuleName(m blueprint.Module) string {
	return b.bp.OtherModuleName(m)
}
func (b *baseModuleContext) OtherModuleDir(m blueprint.Module) string { return b.bp.OtherModuleDir(m) }
func (b *baseModuleContext) OtherModuleErrorf(m blueprint.Module, fmt string, args ...interface{}) {
	b.bp.OtherModuleErrorf(m, fmt, args...)
}
func (b *baseModuleContext) OtherModuleDependencyTag(m blueprint.Module) blueprint.DependencyTag {
	return b.bp.OtherModuleDependencyTag(m)
}
func (b *baseModuleContext) OtherModuleExists(name string) bool { return b.bp.OtherModuleExists(name) }
func (b *baseModuleContext) OtherModuleDependencyVariantExists(variations []blueprint.Variation, name string) bool {
	return b.bp.OtherModuleDependencyVariantExists(variations, name)
}
func (b *baseModuleContext) OtherModuleReverseDependencyVariantExists(name string) bool {
	return b.bp.OtherModuleReverseDependencyVariantExists(name)
}
func (b *baseModuleContext) OtherModuleType(m blueprint.Module) string {
	return b.bp.OtherModuleType(m)
}

func (b *baseModuleContext) GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module {
	return b.bp.GetDirectDepWithTag(name, tag)
}

func (b *baseModuleContext) blueprintBaseModuleContext() blueprint.BaseModuleContext {
	return b.bp
}

type moduleContext struct {
	bp blueprint.ModuleContext
	baseModuleContext
	installDeps     InstallPaths
	installFiles    InstallPaths
	checkbuildFiles Paths
	module          Module
	phonies         map[string]Paths

	// For tests
	buildParams []BuildParams
	ruleParams  map[blueprint.Rule]blueprint.RuleParams
	variables   map[string]string
}

func (m *moduleContext) ninjaError(params BuildParams, err error) (PackageContext, BuildParams) {
	return pctx, BuildParams{
		Rule:            ErrorRule,
		Description:     params.Description,
		Output:          params.Output,
		Outputs:         params.Outputs,
		ImplicitOutput:  params.ImplicitOutput,
		ImplicitOutputs: params.ImplicitOutputs,
		Args: map[string]string{
			"error": err.Error(),
		},
	}
}

func (m *moduleContext) ModuleBuild(pctx PackageContext, params ModuleBuildParams) {
	m.Build(pctx, BuildParams(params))
}

func convertBuildParams(params BuildParams) blueprint.BuildParams {
	bparams := blueprint.BuildParams{
		Rule:            params.Rule,
		Description:     params.Description,
		Deps:            params.Deps,
		Outputs:         params.Outputs.Strings(),
		ImplicitOutputs: params.ImplicitOutputs.Strings(),
		Inputs:          params.Inputs.Strings(),
		Implicits:       params.Implicits.Strings(),
		OrderOnly:       params.OrderOnly.Strings(),
		Validations:     params.Validations.Strings(),
		Args:            params.Args,
		Optional:        !params.Default,
	}

	if params.Depfile != nil {
		bparams.Depfile = params.Depfile.String()
	}
	if params.Output != nil {
		bparams.Outputs = append(bparams.Outputs, params.Output.String())
	}
	if params.ImplicitOutput != nil {
		bparams.ImplicitOutputs = append(bparams.ImplicitOutputs, params.ImplicitOutput.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 params.Validation != nil {
		bparams.Validations = append(bparams.Validations, params.Validation.String())
	}

	bparams.Outputs = proptools.NinjaEscapeList(bparams.Outputs)
	bparams.ImplicitOutputs = proptools.NinjaEscapeList(bparams.ImplicitOutputs)
	bparams.Inputs = proptools.NinjaEscapeList(bparams.Inputs)
	bparams.Implicits = proptools.NinjaEscapeList(bparams.Implicits)
	bparams.OrderOnly = proptools.NinjaEscapeList(bparams.OrderOnly)
	bparams.Validations = proptools.NinjaEscapeList(bparams.Validations)
	bparams.Depfile = proptools.NinjaEscape(bparams.Depfile)

	return bparams
}

func (m *moduleContext) Variable(pctx PackageContext, name, value string) {
	if m.config.captureBuild {
		m.variables[name] = value
	}

	m.bp.Variable(pctx.PackageContext, name, value)
}

func (m *moduleContext) Rule(pctx PackageContext, name string, params blueprint.RuleParams,
	argNames ...string) blueprint.Rule {

	if m.config.UseRemoteBuild() {
		if params.Pool == nil {
			// When USE_GOMA=true or USE_RBE=true are set and the rule is not supported by goma/RBE, restrict
			// jobs to the local parallelism value
			params.Pool = localPool
		} else if params.Pool == remotePool {
			// remotePool is a fake pool used to identify rule that are supported for remoting. If the rule's
			// pool is the remotePool, replace with nil so that ninja runs it at NINJA_REMOTE_NUM_JOBS
			// parallelism.
			params.Pool = nil
		}
	}

	rule := m.bp.Rule(pctx.PackageContext, name, params, argNames...)

	if m.config.captureBuild {
		m.ruleParams[rule] = params
	}

	return rule
}

func (m *moduleContext) Build(pctx PackageContext, params BuildParams) {
	if params.Description != "" {
		params.Description = "${moduleDesc}" + params.Description + "${moduleDescSuffix}"
	}

	if missingDeps := m.GetMissingDependencies(); len(missingDeps) > 0 {
		pctx, params = m.ninjaError(params, fmt.Errorf("module %s missing dependencies: %s\n",
			m.ModuleName(), strings.Join(missingDeps, ", ")))
	}

	if m.config.captureBuild {
		m.buildParams = append(m.buildParams, params)
	}

	m.bp.Build(pctx.PackageContext, convertBuildParams(params))
}

func (m *moduleContext) Phony(name string, deps ...Path) {
	addPhony(m.config, name, deps...)
}

func (m *moduleContext) GetMissingDependencies() []string {
	var missingDeps []string
	missingDeps = append(missingDeps, m.Module().base().commonProperties.MissingDeps...)
	missingDeps = append(missingDeps, m.bp.GetMissingDependencies()...)
	missingDeps = FirstUniqueStrings(missingDeps)
	return missingDeps
}

func (b *baseModuleContext) AddMissingDependencies(deps []string) {
	if deps != nil {
		missingDeps := &b.Module().base().commonProperties.MissingDeps
		*missingDeps = append(*missingDeps, deps...)
		*missingDeps = FirstUniqueStrings(*missingDeps)
	}
}

func (b *baseModuleContext) validateAndroidModule(module blueprint.Module, strict bool) Module {
	aModule, _ := module.(Module)

	if !strict {
		return aModule
	}

	if aModule == nil {
		b.ModuleErrorf("module %q not an android module", b.OtherModuleName(module))
		return nil
	}

	if !aModule.Enabled() {
		if b.Config().AllowMissingDependencies() {
			b.AddMissingDependencies([]string{b.OtherModuleName(aModule)})
		} else {
			b.ModuleErrorf("depends on disabled module %q", b.OtherModuleName(aModule))
		}
		return nil
	}
	return aModule
}

func (b *baseModuleContext) getDirectDepInternal(name string, tag blueprint.DependencyTag) (blueprint.Module, blueprint.DependencyTag) {
	type dep struct {
		mod blueprint.Module
		tag blueprint.DependencyTag
	}
	var deps []dep
	b.VisitDirectDepsBlueprint(func(module blueprint.Module) {
		if aModule, _ := module.(Module); aModule != nil && aModule.base().BaseModuleName() == name {
			returnedTag := b.bp.OtherModuleDependencyTag(aModule)
			if tag == nil || returnedTag == tag {
				deps = append(deps, dep{aModule, returnedTag})
			}
		}
	})
	if len(deps) == 1 {
		return deps[0].mod, deps[0].tag
	} else if len(deps) >= 2 {
		panic(fmt.Errorf("Multiple dependencies having same BaseModuleName() %q found from %q",
			name, b.ModuleName()))
	} else {
		return nil, nil
	}
}

func (b *baseModuleContext) GetDirectDepsWithTag(tag blueprint.DependencyTag) []Module {
	var deps []Module
	b.VisitDirectDepsBlueprint(func(module blueprint.Module) {
		if aModule, _ := module.(Module); aModule != nil {
			if b.bp.OtherModuleDependencyTag(aModule) == tag {
				deps = append(deps, aModule)
			}
		}
	})
	return deps
}

func (m *moduleContext) GetDirectDepWithTag(name string, tag blueprint.DependencyTag) blueprint.Module {
	module, _ := m.getDirectDepInternal(name, tag)
	return module
}

func (b *baseModuleContext) GetDirectDep(name string) (blueprint.Module, blueprint.DependencyTag) {
	return b.getDirectDepInternal(name, nil)
}

func (b *baseModuleContext) VisitDirectDepsBlueprint(visit func(blueprint.Module)) {
	b.bp.VisitDirectDeps(visit)
}

func (b *baseModuleContext) VisitDirectDeps(visit func(Module)) {
	b.bp.VisitDirectDeps(func(module blueprint.Module) {
		if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
			visit(aModule)
		}
	})
}

func (b *baseModuleContext) VisitDirectDepsWithTag(tag blueprint.DependencyTag, visit func(Module)) {
	b.bp.VisitDirectDeps(func(module blueprint.Module) {
		if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
			if b.bp.OtherModuleDependencyTag(aModule) == tag {
				visit(aModule)
			}
		}
	})
}

func (b *baseModuleContext) VisitDirectDepsIf(pred func(Module) bool, visit func(Module)) {
	b.bp.VisitDirectDepsIf(
		// pred
		func(module blueprint.Module) bool {
			if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
				return pred(aModule)
			} else {
				return false
			}
		},
		// visit
		func(module blueprint.Module) {
			visit(module.(Module))
		})
}

func (b *baseModuleContext) VisitDepsDepthFirst(visit func(Module)) {
	b.bp.VisitDepsDepthFirst(func(module blueprint.Module) {
		if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
			visit(aModule)
		}
	})
}

func (b *baseModuleContext) VisitDepsDepthFirstIf(pred func(Module) bool, visit func(Module)) {
	b.bp.VisitDepsDepthFirstIf(
		// pred
		func(module blueprint.Module) bool {
			if aModule := b.validateAndroidModule(module, b.strictVisitDeps); aModule != nil {
				return pred(aModule)
			} else {
				return false
			}
		},
		// visit
		func(module blueprint.Module) {
			visit(module.(Module))
		})
}

func (b *baseModuleContext) WalkDepsBlueprint(visit func(blueprint.Module, blueprint.Module) bool) {
	b.bp.WalkDeps(visit)
}

func (b *baseModuleContext) WalkDeps(visit func(Module, Module) bool) {
	b.walkPath = []Module{b.Module()}
	b.tagPath = []blueprint.DependencyTag{}
	b.bp.WalkDeps(func(child, parent blueprint.Module) bool {
		childAndroidModule, _ := child.(Module)
		parentAndroidModule, _ := parent.(Module)
		if childAndroidModule != nil && parentAndroidModule != nil {
			// record walkPath before visit
			for b.walkPath[len(b.walkPath)-1] != parentAndroidModule {
				b.walkPath = b.walkPath[0 : len(b.walkPath)-1]
				b.tagPath = b.tagPath[0 : len(b.tagPath)-1]
			}
			b.walkPath = append(b.walkPath, childAndroidModule)
			b.tagPath = append(b.tagPath, b.OtherModuleDependencyTag(childAndroidModule))
			return visit(childAndroidModule, parentAndroidModule)
		} else {
			return false
		}
	})
}

func (b *baseModuleContext) GetWalkPath() []Module {
	return b.walkPath
}

func (b *baseModuleContext) GetTagPath() []blueprint.DependencyTag {
	return b.tagPath
}

// A regexp for removing boilerplate from BaseDependencyTag from the string representation of
// a dependency tag.
var tagCleaner = regexp.MustCompile(`\QBaseDependencyTag:{}\E(, )?`)

// PrettyPrintTag returns string representation of the tag, but prefers
// custom String() method if available.
func PrettyPrintTag(tag blueprint.DependencyTag) string {
	// Use tag's custom String() method if available.
	if stringer, ok := tag.(fmt.Stringer); ok {
		return stringer.String()
	}

	// Otherwise, get a default string representation of the tag's struct.
	tagString := fmt.Sprintf("%T: %+v", tag, tag)

	// Remove the boilerplate from BaseDependencyTag as it adds no value.
	tagString = tagCleaner.ReplaceAllString(tagString, "")
	return tagString
}

func (b *baseModuleContext) GetPathString(skipFirst bool) string {
	sb := strings.Builder{}
	tagPath := b.GetTagPath()
	walkPath := b.GetWalkPath()
	if !skipFirst {
		sb.WriteString(walkPath[0].String())
	}
	for i, m := range walkPath[1:] {
		sb.WriteString("\n")
		sb.WriteString(fmt.Sprintf("           via tag %s\n", PrettyPrintTag(tagPath[i])))
		sb.WriteString(fmt.Sprintf("    -> %s", m.String()))
	}
	return sb.String()
}

func (m *moduleContext) VisitAllModuleVariants(visit func(Module)) {
	m.bp.VisitAllModuleVariants(func(module blueprint.Module) {
		visit(module.(Module))
	})
}

func (m *moduleContext) PrimaryModule() Module {
	return m.bp.PrimaryModule().(Module)
}

func (m *moduleContext) FinalModule() Module {
	return m.bp.FinalModule().(Module)
}

func (m *moduleContext) ModuleSubDir() string {
	return m.bp.ModuleSubDir()
}

func (b *baseModuleContext) Target() Target {
	return b.target
}

func (b *baseModuleContext) TargetPrimary() bool {
	return b.targetPrimary
}

func (b *baseModuleContext) MultiTargets() []Target {
	return b.multiTargets
}

func (b *baseModuleContext) Arch() Arch {
	return b.target.Arch
}

func (b *baseModuleContext) Os() OsType {
	return b.os
}

func (b *baseModuleContext) Host() bool {
	return b.os.Class == Host || b.os.Class == HostCross
}

func (b *baseModuleContext) Device() bool {
	return b.os.Class == Device
}

func (b *baseModuleContext) Darwin() bool {
	return b.os == Darwin
}

func (b *baseModuleContext) Fuchsia() bool {
	return b.os == Fuchsia
}

func (b *baseModuleContext) Windows() bool {
	return b.os == Windows
}

func (b *baseModuleContext) Debug() bool {
	return b.debug
}

func (b *baseModuleContext) PrimaryArch() bool {
	if len(b.config.Targets[b.target.Os]) <= 1 {
		return true
	}
	return b.target.Arch.ArchType == b.config.Targets[b.target.Os][0].Arch.ArchType
}

// Makes this module a platform module, i.e. not specific to soc, device,
// product, or system_ext.
func (m *ModuleBase) MakeAsPlatform() {
	m.commonProperties.Vendor = boolPtr(false)
	m.commonProperties.Proprietary = boolPtr(false)
	m.commonProperties.Soc_specific = boolPtr(false)
	m.commonProperties.Product_specific = boolPtr(false)
	m.commonProperties.System_ext_specific = boolPtr(false)
}

func (m *ModuleBase) EnableNativeBridgeSupportByDefault() {
	m.commonProperties.Native_bridge_supported = boolPtr(true)
}

func (m *ModuleBase) MakeAsSystemExt() {
	m.commonProperties.Vendor = boolPtr(false)
	m.commonProperties.Proprietary = boolPtr(false)
	m.commonProperties.Soc_specific = boolPtr(false)
	m.commonProperties.Product_specific = boolPtr(false)
	m.commonProperties.System_ext_specific = boolPtr(true)
}

// IsNativeBridgeSupported returns true if "native_bridge_supported" is explicitly set as "true"
func (m *ModuleBase) IsNativeBridgeSupported() bool {
	return proptools.Bool(m.commonProperties.Native_bridge_supported)
}

func (m *moduleContext) InstallInData() bool {
	return m.module.InstallInData()
}

func (m *moduleContext) InstallInTestcases() bool {
	return m.module.InstallInTestcases()
}

func (m *moduleContext) InstallInSanitizerDir() bool {
	return m.module.InstallInSanitizerDir()
}

func (m *moduleContext) InstallInRamdisk() bool {
	return m.module.InstallInRamdisk()
}

func (m *moduleContext) InstallInRecovery() bool {
	return m.module.InstallInRecovery()
}

func (m *moduleContext) InstallInRoot() bool {
	return m.module.InstallInRoot()
}

func (m *moduleContext) InstallBypassMake() bool {
	return m.module.InstallBypassMake()
}

func (m *moduleContext) InstallForceOS() (*OsType, *ArchType) {
	return m.module.InstallForceOS()
}

func (m *moduleContext) skipInstall(fullInstallPath InstallPath) bool {
	if m.module.base().commonProperties.SkipInstall {
		return true
	}

	// We'll need a solution for choosing which of modules with the same name in different
	// namespaces to install.  For now, reuse the list of namespaces exported to Make as the
	// list of namespaces to install in a Soong-only build.
	if !m.module.base().commonProperties.NamespaceExportedToMake {
		return true
	}

	if m.Device() {
		if m.Config().EmbeddedInMake() && !m.InstallBypassMake() {
			return true
		}

		if m.Config().SkipMegaDeviceInstall(fullInstallPath.String()) {
			return true
		}
	}

	return false
}

func (m *moduleContext) InstallFile(installPath InstallPath, name string, srcPath Path,
	deps ...Path) InstallPath {
	return m.installFile(installPath, name, srcPath, Cp, deps)
}

func (m *moduleContext) InstallExecutable(installPath InstallPath, name string, srcPath Path,
	deps ...Path) InstallPath {
	return m.installFile(installPath, name, srcPath, CpExecutable, deps)
}

func (m *moduleContext) installFile(installPath InstallPath, name string, srcPath Path,
	rule blueprint.Rule, deps []Path) InstallPath {

	fullInstallPath := installPath.Join(m, name)
	m.module.base().hooks.runInstallHooks(m, srcPath, fullInstallPath, false)

	if !m.skipInstall(fullInstallPath) {

		deps = append(deps, m.installDeps.Paths()...)

		var implicitDeps, orderOnlyDeps Paths

		if m.Host() {
			// Installed host modules might be used during the build, depend directly on their
			// dependencies so their timestamp is updated whenever their dependency is updated
			implicitDeps = deps
		} else {
			orderOnlyDeps = deps
		}

		m.Build(pctx, BuildParams{
			Rule:        rule,
			Description: "install " + fullInstallPath.Base(),
			Output:      fullInstallPath,
			Input:       srcPath,
			Implicits:   implicitDeps,
			OrderOnly:   orderOnlyDeps,
			Default:     !m.Config().EmbeddedInMake(),
		})

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

func (m *moduleContext) InstallSymlink(installPath InstallPath, name string, srcPath InstallPath) InstallPath {
	fullInstallPath := installPath.Join(m, name)
	m.module.base().hooks.runInstallHooks(m, srcPath, fullInstallPath, true)

	if !m.skipInstall(fullInstallPath) {

		relPath, err := filepath.Rel(path.Dir(fullInstallPath.String()), srcPath.String())
		if err != nil {
			panic(fmt.Sprintf("Unable to generate symlink between %q and %q: %s", fullInstallPath.Base(), srcPath.Base(), err))
		}
		m.Build(pctx, BuildParams{
			Rule:        Symlink,
			Description: "install symlink " + fullInstallPath.Base(),
			Output:      fullInstallPath,
			Input:       srcPath,
			Default:     !m.Config().EmbeddedInMake(),
			Args: map[string]string{
				"fromPath": relPath,
			},
		})

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

// installPath/name -> absPath where absPath might be a path that is available only at runtime
// (e.g. /apex/...)
func (m *moduleContext) InstallAbsoluteSymlink(installPath InstallPath, name string, absPath string) InstallPath {
	fullInstallPath := installPath.Join(m, name)
	m.module.base().hooks.runInstallHooks(m, nil, fullInstallPath, true)

	if !m.skipInstall(fullInstallPath) {
		m.Build(pctx, BuildParams{
			Rule:        Symlink,
			Description: "install symlink " + fullInstallPath.Base() + " -> " + absPath,
			Output:      fullInstallPath,
			Default:     !m.Config().EmbeddedInMake(),
			Args: map[string]string{
				"fromPath": absPath,
			},
		})

		m.installFiles = append(m.installFiles, fullInstallPath)
	}
	return fullInstallPath
}

func (m *moduleContext) CheckbuildFile(srcPath Path) {
	m.checkbuildFiles = append(m.checkbuildFiles, srcPath)
}

// SrcIsModule decodes module references in the format ":name" into the module name, or empty string if the input
// was not a module reference.
func SrcIsModule(s string) (module string) {
	if len(s) > 1 && s[0] == ':' {
		return s[1:]
	}
	return ""
}

// SrcIsModule decodes module references in the format ":name{.tag}" into the module name and tag, ":name" into the
// module name and an empty string for the tag, or empty strings if the input was not a module reference.
func SrcIsModuleWithTag(s string) (module, tag string) {
	if len(s) > 1 && s[0] == ':' {
		module = s[1:]
		if tagStart := strings.IndexByte(module, '{'); tagStart > 0 {
			if module[len(module)-1] == '}' {
				tag = module[tagStart+1 : len(module)-1]
				module = module[:tagStart]
				return module, tag
			}
		}
		return module, ""
	}
	return "", ""
}

type sourceOrOutputDependencyTag struct {
	blueprint.BaseDependencyTag
	tag string
}

func sourceOrOutputDepTag(tag string) blueprint.DependencyTag {
	return sourceOrOutputDependencyTag{tag: tag}
}

var SourceDepTag = sourceOrOutputDepTag("")

// Adds necessary dependencies to satisfy filegroup or generated sources modules listed in srcFiles
// using ":module" syntax, if any.
//
// Deprecated: tag the property with `android:"path"` instead.
func ExtractSourcesDeps(ctx BottomUpMutatorContext, srcFiles []string) {
	set := make(map[string]bool)

	for _, s := range srcFiles {
		if m, t := SrcIsModuleWithTag(s); m != "" {
			if _, found := set[s]; found {
				ctx.ModuleErrorf("found source dependency duplicate: %q!", s)
			} else {
				set[s] = true
				ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
			}
		}
	}
}

// Adds necessary dependencies to satisfy filegroup or generated sources modules specified in s
// using ":module" syntax, if any.
//
// Deprecated: tag the property with `android:"path"` instead.
func ExtractSourceDeps(ctx BottomUpMutatorContext, s *string) {
	if s != nil {
		if m, t := SrcIsModuleWithTag(*s); m != "" {
			ctx.AddDependency(ctx.Module(), sourceOrOutputDepTag(t), m)
		}
	}
}

// A module that implements SourceFileProducer can be referenced from any property that is tagged with `android:"path"`
// using the ":module" syntax and provides a list of paths to be used as if they were listed in the property.
type SourceFileProducer interface {
	Srcs() Paths
}

// A module that implements OutputFileProducer can be referenced from any property that is tagged with `android:"path"`
// using the ":module" syntax or ":module{.tag}" syntax and provides a list of output files to be used as if they were
// listed in the property.
type OutputFileProducer interface {
	OutputFiles(tag string) (Paths, error)
}

// OutputFilesForModule returns the paths from an OutputFileProducer with the given tag.  On error, including if the
// module produced zero paths, it reports errors to the ctx and returns nil.
func OutputFilesForModule(ctx PathContext, module blueprint.Module, tag string) Paths {
	paths, err := outputFilesForModule(ctx, module, tag)
	if err != nil {
		reportPathError(ctx, err)
		return nil
	}
	return paths
}

// OutputFileForModule returns the path from an OutputFileProducer with the given tag.  On error, including if the
// module produced zero or multiple paths, it reports errors to the ctx and returns nil.
func OutputFileForModule(ctx PathContext, module blueprint.Module, tag string) Path {
	paths, err := outputFilesForModule(ctx, module, tag)
	if err != nil {
		reportPathError(ctx, err)
		return nil
	}
	if len(paths) > 1 {
		ReportPathErrorf(ctx, "got multiple output files from module %q, expected exactly one",
			pathContextName(ctx, module))
		return nil
	}
	return paths[0]
}

func outputFilesForModule(ctx PathContext, module blueprint.Module, tag string) (Paths, error) {
	if outputFileProducer, ok := module.(OutputFileProducer); ok {
		paths, err := outputFileProducer.OutputFiles(tag)
		if err != nil {
			return nil, fmt.Errorf("failed to get output file from module %q: %s",
				pathContextName(ctx, module), err.Error())
		}
		if len(paths) == 0 {
			return nil, fmt.Errorf("failed to get output files from module %q", pathContextName(ctx, module))
		}
		return paths, nil
	} else {
		return nil, fmt.Errorf("module %q is not an OutputFileProducer", pathContextName(ctx, module))
	}
}

type HostToolProvider interface {
	HostToolPath() OptionalPath
}

// Returns a list of paths expanded from globs and modules referenced using ":module" syntax.  The property must
// be tagged with `android:"path" to support automatic source module dependency resolution.
//
// Deprecated: use PathsForModuleSrc or PathsForModuleSrcExcludes instead.
func (m *moduleContext) ExpandSources(srcFiles, excludes []string) Paths {
	return PathsForModuleSrcExcludes(m, srcFiles, excludes)
}

// Returns a single path expanded from globs and modules referenced using ":module" syntax.  The property must
// be tagged with `android:"path" to support automatic source module dependency resolution.
//
// Deprecated: use PathForModuleSrc instead.
func (m *moduleContext) ExpandSource(srcFile, prop string) Path {
	return PathForModuleSrc(m, srcFile)
}

// Returns an optional single path expanded from globs and modules referenced using ":module" syntax if
// the srcFile is non-nil.  The property must be tagged with `android:"path" to support automatic source module
// dependency resolution.
func (m *moduleContext) ExpandOptionalSource(srcFile *string, prop string) OptionalPath {
	if srcFile != nil {
		return OptionalPathForPath(PathForModuleSrc(m, *srcFile))
	}
	return OptionalPath{}
}

func (m *moduleContext) RequiredModuleNames() []string {
	return m.module.RequiredModuleNames()
}

func (m *moduleContext) HostRequiredModuleNames() []string {
	return m.module.HostRequiredModuleNames()
}

func (m *moduleContext) TargetRequiredModuleNames() []string {
	return m.module.TargetRequiredModuleNames()
}

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

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

func parentDir(dir string) string {
	dir, _ = filepath.Split(dir)
	return filepath.Clean(dir)
}

type buildTargetSingleton struct{}

func (c *buildTargetSingleton) GenerateBuildActions(ctx SingletonContext) {
	var checkbuildDeps Paths

	mmTarget := func(dir string) string {
		return "MODULES-IN-" + strings.Replace(filepath.Clean(dir), "/", "-", -1)
	}

	modulesInDir := make(map[string]Paths)

	ctx.VisitAllModules(func(module Module) {
		blueprintDir := module.base().blueprintDir
		installTarget := module.base().installTarget
		checkbuildTarget := module.base().checkbuildTarget

		if checkbuildTarget != nil {
			checkbuildDeps = append(checkbuildDeps, checkbuildTarget)
			modulesInDir[blueprintDir] = append(modulesInDir[blueprintDir], checkbuildTarget)
		}

		if installTarget != nil {
			modulesInDir[blueprintDir] = append(modulesInDir[blueprintDir], installTarget)
		}
	})

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

	// Create a top-level checkbuild target that depends on all modules
	ctx.Phony("checkbuild"+suffix, checkbuildDeps...)

	// Make will generate the MODULES-IN-* targets
	if ctx.Config().EmbeddedInMake() {
		return
	}

	// Ensure ancestor directories are in modulesInDir
	dirs := SortedStringKeys(modulesInDir)
	for _, dir := range dirs {
		dir := parentDir(dir)
		for dir != "." && dir != "/" {
			if _, exists := modulesInDir[dir]; exists {
				break
			}
			modulesInDir[dir] = nil
			dir = parentDir(dir)
		}
	}

	// Make directories build their direct subdirectories
	for _, dir := range dirs {
		p := parentDir(dir)
		if p != "." && p != "/" {
			modulesInDir[p] = append(modulesInDir[p], PathForPhony(ctx, mmTarget(dir)))
		}
	}

	// Create a MODULES-IN-<directory> target that depends on all modules in a directory, and
	// depends on the MODULES-IN-* targets of all of its subdirectories that contain Android.bp
	// files.
	for _, dir := range dirs {
		ctx.Phony(mmTarget(dir), modulesInDir[dir]...)
	}

	// Create (host|host-cross|target)-<OS> phony rules to build a reduced checkbuild.
	osDeps := map[OsType]Paths{}
	ctx.VisitAllModules(func(module Module) {
		if module.Enabled() {
			os := module.Target().Os
			osDeps[os] = append(osDeps[os], module.base().checkbuildFiles...)
		}
	})

	osClass := make(map[string]Paths)
	for os, deps := range osDeps {
		var className string

		switch os.Class {
		case Host:
			className = "host"
		case HostCross:
			className = "host-cross"
		case Device:
			className = "target"
		default:
			continue
		}

		name := className + "-" + os.Name
		osClass[className] = append(osClass[className], PathForPhony(ctx, name))

		ctx.Phony(name, deps...)
	}

	// Wrap those into host|host-cross|target phony rules
	for _, class := range SortedStringKeys(osClass) {
		ctx.Phony(class, osClass[class]...)
	}
}

// Collect information for opening IDE project files in java/jdeps.go.
type IDEInfo interface {
	IDEInfo(ideInfo *IdeInfo)
	BaseModuleName() string
}

// Extract the base module name from the Import name.
// Often the Import name has a prefix "prebuilt_".
// Remove the prefix explicitly if needed
// until we find a better solution to get the Import name.
type IDECustomizedModuleName interface {
	IDECustomizedModuleName() string
}

type IdeInfo struct {
	Deps              []string `json:"dependencies,omitempty"`
	Srcs              []string `json:"srcs,omitempty"`
	Aidl_include_dirs []string `json:"aidl_include_dirs,omitempty"`
	Jarjar_rules      []string `json:"jarjar_rules,omitempty"`
	Jars              []string `json:"jars,omitempty"`
	Classes           []string `json:"class,omitempty"`
	Installed_paths   []string `json:"installed,omitempty"`
	SrcJars           []string `json:"srcjars,omitempty"`
	Paths             []string `json:"path,omitempty"`
}

func CheckBlueprintSyntax(ctx BaseModuleContext, filename string, contents string) []error {
	bpctx := ctx.blueprintBaseModuleContext()
	return blueprint.CheckBlueprintSyntax(bpctx.ModuleFactories(), filename, contents)
}