platform_build_soong/cc/cc.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 cc

// This file contains the module types for compiling C/C++ for Android, and converts the properties
// into the flags and filenames necessary to pass to the compiler.  The final creation of the rules
// is handled in builder.go

import (
	"strconv"
	"strings"

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

	"android/soong/android"
	"android/soong/cc/config"
	"android/soong/genrule"
)

func init() {
	android.RegisterModuleType("cc_defaults", defaultsFactory)

	android.PreDepsMutators(func(ctx android.RegisterMutatorsContext) {
		ctx.BottomUp("image", imageMutator).Parallel()
		ctx.BottomUp("link", LinkageMutator).Parallel()
		ctx.BottomUp("vndk", vndkMutator).Parallel()
		ctx.BottomUp("ndk_api", ndkApiMutator).Parallel()
		ctx.BottomUp("test_per_src", testPerSrcMutator).Parallel()
		ctx.BottomUp("version", versionMutator).Parallel()
		ctx.BottomUp("begin", BeginMutator).Parallel()
	})

	android.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
		ctx.TopDown("asan_deps", sanitizerDepsMutator(asan))
		ctx.BottomUp("asan", sanitizerMutator(asan)).Parallel()

		ctx.TopDown("hwasan_deps", sanitizerDepsMutator(hwasan))
		ctx.BottomUp("hwasan", sanitizerMutator(hwasan)).Parallel()

		ctx.TopDown("cfi_deps", sanitizerDepsMutator(cfi))
		ctx.BottomUp("cfi", sanitizerMutator(cfi)).Parallel()

		ctx.TopDown("scs_deps", sanitizerDepsMutator(scs))
		ctx.BottomUp("scs", sanitizerMutator(scs)).Parallel()

		ctx.TopDown("tsan_deps", sanitizerDepsMutator(tsan))
		ctx.BottomUp("tsan", sanitizerMutator(tsan)).Parallel()

		ctx.TopDown("sanitize_runtime_deps", sanitizerRuntimeDepsMutator)

		ctx.BottomUp("coverage", coverageLinkingMutator).Parallel()
		ctx.TopDown("vndk_deps", sabiDepsMutator)

		ctx.TopDown("lto_deps", ltoDepsMutator)
		ctx.BottomUp("lto", ltoMutator).Parallel()
	})

	pctx.Import("android/soong/cc/config")
}

type Deps struct {
	SharedLibs, LateSharedLibs                  []string
	StaticLibs, LateStaticLibs, WholeStaticLibs []string
	HeaderLibs                                  []string
	RuntimeLibs                                 []string

	ReexportSharedLibHeaders, ReexportStaticLibHeaders, ReexportHeaderLibHeaders []string

	ObjFiles []string

	GeneratedSources []string
	GeneratedHeaders []string

	ReexportGeneratedHeaders []string

	CrtBegin, CrtEnd string

	// Used for host bionic
	LinkerFlagsFile string
	DynamicLinker   string
}

type PathDeps struct {
	// Paths to .so files
	SharedLibs, LateSharedLibs android.Paths
	// Paths to the dependencies to use for .so files (.so.toc files)
	SharedLibsDeps, LateSharedLibsDeps android.Paths
	// Paths to .a files
	StaticLibs, LateStaticLibs, WholeStaticLibs android.Paths

	// Paths to .o files
	Objs               Objects
	StaticLibObjs      Objects
	WholeStaticLibObjs Objects

	// Paths to generated source files
	GeneratedSources android.Paths
	GeneratedHeaders android.Paths

	Flags, ReexportedFlags []string
	ReexportedFlagsDeps    android.Paths

	// Paths to crt*.o files
	CrtBegin, CrtEnd android.OptionalPath

	// Path to the file container flags to use with the linker
	LinkerFlagsFile android.OptionalPath

	// Path to the dynamic linker binary
	DynamicLinker android.OptionalPath
}

type Flags struct {
	GlobalFlags     []string // Flags that apply to C, C++, and assembly source files
	ArFlags         []string // Flags that apply to ar
	AsFlags         []string // Flags that apply to assembly source files
	CFlags          []string // Flags that apply to C and C++ source files
	ToolingCFlags   []string // Flags that apply to C and C++ source files parsed by clang LibTooling tools
	ConlyFlags      []string // Flags that apply to C source files
	CppFlags        []string // Flags that apply to C++ source files
	ToolingCppFlags []string // Flags that apply to C++ source files parsed by clang LibTooling tools
	YaccFlags       []string // Flags that apply to Yacc source files
	aidlFlags       []string // Flags that apply to aidl source files
	rsFlags         []string // Flags that apply to renderscript source files
	LdFlags         []string // Flags that apply to linker command lines
	libFlags        []string // Flags to add libraries early to the link order
	TidyFlags       []string // Flags that apply to clang-tidy
	SAbiFlags       []string // Flags that apply to header-abi-dumper
	YasmFlags       []string // Flags that apply to yasm assembly source files

	// Global include flags that apply to C, C++, and assembly source files
	// These must be after any module include flags, which will be in GlobalFlags.
	SystemIncludeFlags []string

	Toolchain config.Toolchain
	Tidy      bool
	Coverage  bool
	SAbiDump  bool

	RequiredInstructionSet string
	DynamicLinker          string

	CFlagsDeps  android.Paths // Files depended on by compiler flags
	LdFlagsDeps android.Paths // Files depended on by linker flags

	GroupStaticLibs bool

	protoDeps        android.Paths
	protoFlags       []string // Flags that apply to proto source files
	protoOutTypeFlag string   // The output type, --cpp_out for example
	protoOutParams   []string // Flags that modify the output of proto generated files
	protoC           bool     // Whether to use C instead of C++
	protoOptionsFile bool     // Whether to look for a .options file next to the .proto
	ProtoRoot        bool
}

type ObjectLinkerProperties struct {
	// names of other cc_object modules to link into this module using partial linking
	Objs []string `android:"arch_variant"`

	// if set, add an extra objcopy --prefix-symbols= step
	Prefix_symbols *string
}

// Properties used to compile all C or C++ modules
type BaseProperties struct {
	// Deprecated. true is the default, false is invalid.
	Clang *bool `android:"arch_variant"`

	// Minimum sdk version supported when compiling against the ndk
	Sdk_version *string

	AndroidMkSharedLibs      []string `blueprint:"mutated"`
	AndroidMkStaticLibs      []string `blueprint:"mutated"`
	AndroidMkRuntimeLibs     []string `blueprint:"mutated"`
	AndroidMkWholeStaticLibs []string `blueprint:"mutated"`
	HideFromMake             bool     `blueprint:"mutated"`
	PreventInstall           bool     `blueprint:"mutated"`

	UseVndk bool `blueprint:"mutated"`

	// *.logtags files, to combine together in order to generate the /system/etc/event-log-tags
	// file
	Logtags []string

	// Make this module available when building for recovery
	Recovery_available *bool

	InRecovery bool `blueprint:"mutated"`
}

type VendorProperties struct {
	// whether this module should be allowed to be directly depended by other
	// modules with `vendor: true`, `proprietary: true`, or `vendor_available:true`.
	// If set to true, two variants will be built separately, one like
	// normal, and the other limited to the set of libraries and headers
	// that are exposed to /vendor modules.
	//
	// The vendor variant may be used with a different (newer) /system,
	// so it shouldn't have any unversioned runtime dependencies, or
	// make assumptions about the system that may not be true in the
	// future.
	//
	// If set to false, this module becomes inaccessible from /vendor modules.
	//
	// Default value is true when vndk: {enabled: true} or vendor: true.
	//
	// Nothing happens if BOARD_VNDK_VERSION isn't set in the BoardConfig.mk
	Vendor_available *bool

	// whether this module is capable of being loaded with other instance
	// (possibly an older version) of the same module in the same process.
	// Currently, a shared library that is a member of VNDK (vndk: {enabled: true})
	// can be double loaded in a vendor process if the library is also a
	// (direct and indirect) dependency of an LLNDK library. Such libraries must be
	// explicitly marked as `double_loadable: true` by the owner, or the dependency
	// from the LLNDK lib should be cut if the lib is not designed to be double loaded.
	Double_loadable *bool
}

type ModuleContextIntf interface {
	static() bool
	staticBinary() bool
	toolchain() config.Toolchain
	useSdk() bool
	sdkVersion() string
	useVndk() bool
	isVndk() bool
	isVndkSp() bool
	isVndkExt() bool
	inRecovery() bool
	shouldCreateVndkSourceAbiDump() bool
	selectedStl() string
	baseModuleName() string
	getVndkExtendsModuleName() string
	isPgoCompile() bool
}

type ModuleContext interface {
	android.ModuleContext
	ModuleContextIntf
}

type BaseModuleContext interface {
	android.BaseContext
	ModuleContextIntf
}

type DepsContext interface {
	android.BottomUpMutatorContext
	ModuleContextIntf
}

type feature interface {
	begin(ctx BaseModuleContext)
	deps(ctx DepsContext, deps Deps) Deps
	flags(ctx ModuleContext, flags Flags) Flags
	props() []interface{}
}

type compiler interface {
	compilerInit(ctx BaseModuleContext)
	compilerDeps(ctx DepsContext, deps Deps) Deps
	compilerFlags(ctx ModuleContext, flags Flags, deps PathDeps) Flags
	compilerProps() []interface{}

	appendCflags([]string)
	appendAsflags([]string)
	compile(ctx ModuleContext, flags Flags, deps PathDeps) Objects
}

type linker interface {
	linkerInit(ctx BaseModuleContext)
	linkerDeps(ctx DepsContext, deps Deps) Deps
	linkerFlags(ctx ModuleContext, flags Flags) Flags
	linkerProps() []interface{}

	link(ctx ModuleContext, flags Flags, deps PathDeps, objs Objects) android.Path
	appendLdflags([]string)
}

type installer interface {
	installerProps() []interface{}
	install(ctx ModuleContext, path android.Path)
	inData() bool
	inSanitizerDir() bool
	hostToolPath() android.OptionalPath
}

type dependencyTag struct {
	blueprint.BaseDependencyTag
	name    string
	library bool

	reexportFlags bool
}

var (
	sharedDepTag          = dependencyTag{name: "shared", library: true}
	sharedExportDepTag    = dependencyTag{name: "shared", library: true, reexportFlags: true}
	lateSharedDepTag      = dependencyTag{name: "late shared", library: true}
	staticDepTag          = dependencyTag{name: "static", library: true}
	staticExportDepTag    = dependencyTag{name: "static", library: true, reexportFlags: true}
	lateStaticDepTag      = dependencyTag{name: "late static", library: true}
	wholeStaticDepTag     = dependencyTag{name: "whole static", library: true, reexportFlags: true}
	headerDepTag          = dependencyTag{name: "header", library: true}
	headerExportDepTag    = dependencyTag{name: "header", library: true, reexportFlags: true}
	genSourceDepTag       = dependencyTag{name: "gen source"}
	genHeaderDepTag       = dependencyTag{name: "gen header"}
	genHeaderExportDepTag = dependencyTag{name: "gen header", reexportFlags: true}
	objDepTag             = dependencyTag{name: "obj"}
	crtBeginDepTag        = dependencyTag{name: "crtbegin"}
	crtEndDepTag          = dependencyTag{name: "crtend"}
	linkerFlagsDepTag     = dependencyTag{name: "linker flags file"}
	dynamicLinkerDepTag   = dependencyTag{name: "dynamic linker"}
	reuseObjTag           = dependencyTag{name: "reuse objects"}
	ndkStubDepTag         = dependencyTag{name: "ndk stub", library: true}
	ndkLateStubDepTag     = dependencyTag{name: "ndk late stub", library: true}
	vndkExtDepTag         = dependencyTag{name: "vndk extends", library: true}
	runtimeDepTag         = dependencyTag{name: "runtime lib"}
)

// Module contains the properties and members used by all C/C++ module types, and implements
// the blueprint.Module interface.  It delegates to compiler, linker, and installer interfaces
// to construct the output file.  Behavior can be customized with a Customizer interface
type Module struct {
	android.ModuleBase
	android.DefaultableModuleBase
	android.ApexModuleBase

	Properties       BaseProperties
	VendorProperties VendorProperties

	// initialize before calling Init
	hod      android.HostOrDeviceSupported
	multilib android.Multilib

	// delegates, initialize before calling Init
	features  []feature
	compiler  compiler
	linker    linker
	installer installer
	stl       *stl
	sanitize  *sanitize
	coverage  *coverage
	sabi      *sabi
	vndkdep   *vndkdep
	lto       *lto
	pgo       *pgo

	androidMkSharedLibDeps []string

	outputFile android.OptionalPath

	cachedToolchain config.Toolchain

	subAndroidMkOnce map[subAndroidMkProvider]bool

	// Flags used to compile this module
	flags Flags

	// When calling a linker, if module A depends on module B, then A must precede B in its command
	// line invocation. depsInLinkOrder stores the proper ordering of all of the transitive
	// deps of this module
	depsInLinkOrder android.Paths

	// only non-nil when this is a shared library that reuses the objects of a static library
	staticVariant *Module
}

func (c *Module) OutputFile() android.OptionalPath {
	return c.outputFile
}

func (c *Module) Init() android.Module {
	c.AddProperties(&c.Properties, &c.VendorProperties)
	if c.compiler != nil {
		c.AddProperties(c.compiler.compilerProps()...)
	}
	if c.linker != nil {
		c.AddProperties(c.linker.linkerProps()...)
	}
	if c.installer != nil {
		c.AddProperties(c.installer.installerProps()...)
	}
	if c.stl != nil {
		c.AddProperties(c.stl.props()...)
	}
	if c.sanitize != nil {
		c.AddProperties(c.sanitize.props()...)
	}
	if c.coverage != nil {
		c.AddProperties(c.coverage.props()...)
	}
	if c.sabi != nil {
		c.AddProperties(c.sabi.props()...)
	}
	if c.vndkdep != nil {
		c.AddProperties(c.vndkdep.props()...)
	}
	if c.lto != nil {
		c.AddProperties(c.lto.props()...)
	}
	if c.pgo != nil {
		c.AddProperties(c.pgo.props()...)
	}
	for _, feature := range c.features {
		c.AddProperties(feature.props()...)
	}

	c.Prefer32(func(ctx android.BaseModuleContext, base *android.ModuleBase, class android.OsClass) bool {
		switch class {
		case android.Device:
			return ctx.Config().DevicePrefer32BitExecutables()
		case android.HostCross:
			// Windows builds always prefer 32-bit
			return true
		default:
			return false
		}
	})
	android.InitAndroidArchModule(c, c.hod, c.multilib)

	android.InitDefaultableModule(c)

	android.InitApexModule(c)

	return c
}

// Returns true for dependency roots (binaries)
// TODO(ccross): also handle dlopenable libraries
func (c *Module) isDependencyRoot() bool {
	if root, ok := c.linker.(interface {
		isDependencyRoot() bool
	}); ok {
		return root.isDependencyRoot()
	}
	return false
}

func (c *Module) useVndk() bool {
	return c.Properties.UseVndk
}

func (c *Module) isVndk() bool {
	if vndkdep := c.vndkdep; vndkdep != nil {
		return vndkdep.isVndk()
	}
	return false
}

func (c *Module) isPgoCompile() bool {
	if pgo := c.pgo; pgo != nil {
		return pgo.Properties.PgoCompile
	}
	return false
}

func (c *Module) isVndkSp() bool {
	if vndkdep := c.vndkdep; vndkdep != nil {
		return vndkdep.isVndkSp()
	}
	return false
}

func (c *Module) isVndkExt() bool {
	if vndkdep := c.vndkdep; vndkdep != nil {
		return vndkdep.isVndkExt()
	}
	return false
}

func (c *Module) getVndkExtendsModuleName() string {
	if vndkdep := c.vndkdep; vndkdep != nil {
		return vndkdep.getVndkExtendsModuleName()
	}
	return ""
}

// Returns true only when this module is configured to have core and vendor
// variants.
func (c *Module) hasVendorVariant() bool {
	return c.isVndk() || Bool(c.VendorProperties.Vendor_available)
}

func (c *Module) inRecovery() bool {
	return c.Properties.InRecovery || c.ModuleBase.InstallInRecovery()
}

func (c *Module) onlyInRecovery() bool {
	return c.ModuleBase.InstallInRecovery()
}

type baseModuleContext struct {
	android.BaseContext
	moduleContextImpl
}

type depsContext struct {
	android.BottomUpMutatorContext
	moduleContextImpl
}

type moduleContext struct {
	android.ModuleContext
	moduleContextImpl
}

func (ctx *moduleContext) SocSpecific() bool {
	return ctx.ModuleContext.SocSpecific() ||
		(ctx.mod.hasVendorVariant() && ctx.mod.useVndk() && !ctx.mod.isVndk())
}

type moduleContextImpl struct {
	mod *Module
	ctx BaseModuleContext
}

func (ctx *moduleContextImpl) toolchain() config.Toolchain {
	return ctx.mod.toolchain(ctx.ctx)
}

func (ctx *moduleContextImpl) static() bool {
	return ctx.mod.static()
}

func (ctx *moduleContextImpl) staticBinary() bool {
	if static, ok := ctx.mod.linker.(interface {
		staticBinary() bool
	}); ok {
		return static.staticBinary()
	}
	return false
}

func (ctx *moduleContextImpl) useSdk() bool {
	if ctx.ctx.Device() && !ctx.useVndk() && !ctx.inRecovery() {
		return String(ctx.mod.Properties.Sdk_version) != ""
	}
	return false
}

func (ctx *moduleContextImpl) sdkVersion() string {
	if ctx.ctx.Device() {
		if ctx.useVndk() {
			vndk_ver := ctx.ctx.DeviceConfig().VndkVersion()
			if vndk_ver == "current" {
				platform_vndk_ver := ctx.ctx.DeviceConfig().PlatformVndkVersion()
				if inList(platform_vndk_ver, ctx.ctx.Config().PlatformVersionCombinedCodenames()) {
					return "current"
				}
				return platform_vndk_ver
			}
			return vndk_ver
		}
		return String(ctx.mod.Properties.Sdk_version)
	}
	return ""
}

func (ctx *moduleContextImpl) useVndk() bool {
	return ctx.mod.useVndk()
}

func (ctx *moduleContextImpl) isVndk() bool {
	return ctx.mod.isVndk()
}

func (ctx *moduleContextImpl) isPgoCompile() bool {
	return ctx.mod.isPgoCompile()
}

func (ctx *moduleContextImpl) isVndkSp() bool {
	return ctx.mod.isVndkSp()
}

func (ctx *moduleContextImpl) isVndkExt() bool {
	return ctx.mod.isVndkExt()
}

func (ctx *moduleContextImpl) inRecovery() bool {
	return ctx.mod.inRecovery()
}

// Check whether ABI dumps should be created for this module.
func (ctx *moduleContextImpl) shouldCreateVndkSourceAbiDump() bool {
	if ctx.ctx.Config().IsEnvTrue("SKIP_ABI_CHECKS") {
		return false
	}
	if sanitize := ctx.mod.sanitize; sanitize != nil {
		if !sanitize.isVariantOnProductionDevice() {
			return false
		}
	}
	if !ctx.ctx.Device() {
		// Host modules do not need ABI dumps.
		return false
	}
	if inList(ctx.baseModuleName(), llndkLibraries) {
		return true
	}
	if inList(ctx.baseModuleName(), ndkMigratedLibs) {
		return true
	}
	if ctx.useVndk() && ctx.isVndk() {
		// Return true if this is VNDK-core, VNDK-SP, or VNDK-Ext and this is not
		// VNDK-private.
		return Bool(ctx.mod.VendorProperties.Vendor_available) || ctx.isVndkExt()
	}
	return false
}

func (ctx *moduleContextImpl) selectedStl() string {
	if stl := ctx.mod.stl; stl != nil {
		return stl.Properties.SelectedStl
	}
	return ""
}

func (ctx *moduleContextImpl) baseModuleName() string {
	return ctx.mod.ModuleBase.BaseModuleName()
}

func (ctx *moduleContextImpl) getVndkExtendsModuleName() string {
	return ctx.mod.getVndkExtendsModuleName()
}

func newBaseModule(hod android.HostOrDeviceSupported, multilib android.Multilib) *Module {
	return &Module{
		hod:      hod,
		multilib: multilib,
	}
}

func newModule(hod android.HostOrDeviceSupported, multilib android.Multilib) *Module {
	module := newBaseModule(hod, multilib)
	module.features = []feature{
		&tidyFeature{},
	}
	module.stl = &stl{}
	module.sanitize = &sanitize{}
	module.coverage = &coverage{}
	module.sabi = &sabi{}
	module.vndkdep = &vndkdep{}
	module.lto = &lto{}
	module.pgo = &pgo{}
	return module
}

func (c *Module) Prebuilt() *android.Prebuilt {
	if p, ok := c.linker.(prebuiltLinkerInterface); ok {
		return p.prebuilt()
	}
	return nil
}

func (c *Module) Name() string {
	name := c.ModuleBase.Name()
	if p, ok := c.linker.(interface {
		Name(string) string
	}); ok {
		name = p.Name(name)
	}
	return name
}

// orderDeps reorders dependencies into a list such that if module A depends on B, then
// A will precede B in the resultant list.
// This is convenient for passing into a linker.
// Note that directSharedDeps should be the analogous static library for each shared lib dep
func orderDeps(directStaticDeps []android.Path, directSharedDeps []android.Path, allTransitiveDeps map[android.Path][]android.Path) (orderedAllDeps []android.Path, orderedDeclaredDeps []android.Path) {
	// If A depends on B, then
	//   Every list containing A will also contain B later in the list
	//   So, after concatenating all lists, the final instance of B will have come from the same
	//     original list as the final instance of A
	//   So, the final instance of B will be later in the concatenation than the final A
	//   So, keeping only the final instance of A and of B ensures that A is earlier in the output
	//     list than B
	for _, dep := range directStaticDeps {
		orderedAllDeps = append(orderedAllDeps, dep)
		orderedAllDeps = append(orderedAllDeps, allTransitiveDeps[dep]...)
	}
	for _, dep := range directSharedDeps {
		orderedAllDeps = append(orderedAllDeps, dep)
		orderedAllDeps = append(orderedAllDeps, allTransitiveDeps[dep]...)
	}

	orderedAllDeps = android.LastUniquePaths(orderedAllDeps)

	// We don't want to add any new dependencies into directStaticDeps (to allow the caller to
	// intentionally exclude or replace any unwanted transitive dependencies), so we limit the
	// resultant list to only what the caller has chosen to include in directStaticDeps
	_, orderedDeclaredDeps = android.FilterPathList(orderedAllDeps, directStaticDeps)

	return orderedAllDeps, orderedDeclaredDeps
}

func orderStaticModuleDeps(module *Module, staticDeps []*Module, sharedDeps []*Module) (results []android.Path) {
	// convert Module to Path
	allTransitiveDeps := make(map[android.Path][]android.Path, len(staticDeps))
	staticDepFiles := []android.Path{}
	for _, dep := range staticDeps {
		allTransitiveDeps[dep.outputFile.Path()] = dep.depsInLinkOrder
		staticDepFiles = append(staticDepFiles, dep.outputFile.Path())
	}
	sharedDepFiles := []android.Path{}
	for _, sharedDep := range sharedDeps {
		staticAnalogue := sharedDep.staticVariant
		if staticAnalogue != nil {
			allTransitiveDeps[staticAnalogue.outputFile.Path()] = staticAnalogue.depsInLinkOrder
			sharedDepFiles = append(sharedDepFiles, staticAnalogue.outputFile.Path())
		}
	}

	// reorder the dependencies based on transitive dependencies
	module.depsInLinkOrder, results = orderDeps(staticDepFiles, sharedDepFiles, allTransitiveDeps)

	return results
}

func (c *Module) GenerateAndroidBuildActions(actx android.ModuleContext) {
	ctx := &moduleContext{
		ModuleContext: actx,
		moduleContextImpl: moduleContextImpl{
			mod: c,
		},
	}
	ctx.ctx = ctx

	deps := c.depsToPaths(ctx)
	if ctx.Failed() {
		return
	}

	if c.Properties.Clang != nil && *c.Properties.Clang == false {
		ctx.PropertyErrorf("clang", "false (GCC) is no longer supported")
	}

	flags := Flags{
		Toolchain: c.toolchain(ctx),
	}
	if c.compiler != nil {
		flags = c.compiler.compilerFlags(ctx, flags, deps)
	}
	if c.linker != nil {
		flags = c.linker.linkerFlags(ctx, flags)
	}
	if c.stl != nil {
		flags = c.stl.flags(ctx, flags)
	}
	if c.sanitize != nil {
		flags = c.sanitize.flags(ctx, flags)
	}
	if c.coverage != nil {
		flags = c.coverage.flags(ctx, flags)
	}
	if c.lto != nil {
		flags = c.lto.flags(ctx, flags)
	}
	if c.pgo != nil {
		flags = c.pgo.flags(ctx, flags)
	}
	for _, feature := range c.features {
		flags = feature.flags(ctx, flags)
	}
	if ctx.Failed() {
		return
	}

	flags.CFlags, _ = filterList(flags.CFlags, config.IllegalFlags)
	flags.CppFlags, _ = filterList(flags.CppFlags, config.IllegalFlags)
	flags.ConlyFlags, _ = filterList(flags.ConlyFlags, config.IllegalFlags)

	flags.GlobalFlags = append(flags.GlobalFlags, deps.Flags...)
	c.flags = flags
	// We need access to all the flags seen by a source file.
	if c.sabi != nil {
		flags = c.sabi.flags(ctx, flags)
	}
	// Optimization to reduce size of build.ninja
	// Replace the long list of flags for each file with a module-local variable
	ctx.Variable(pctx, "cflags", strings.Join(flags.CFlags, " "))
	ctx.Variable(pctx, "cppflags", strings.Join(flags.CppFlags, " "))
	ctx.Variable(pctx, "asflags", strings.Join(flags.AsFlags, " "))
	flags.CFlags = []string{"$cflags"}
	flags.CppFlags = []string{"$cppflags"}
	flags.AsFlags = []string{"$asflags"}

	var objs Objects
	if c.compiler != nil {
		objs = c.compiler.compile(ctx, flags, deps)
		if ctx.Failed() {
			return
		}
	}

	if c.linker != nil {
		outputFile := c.linker.link(ctx, flags, deps, objs)
		if ctx.Failed() {
			return
		}
		c.outputFile = android.OptionalPathForPath(outputFile)
	}

	if c.installer != nil && !c.Properties.PreventInstall && c.IsForPlatform() && c.outputFile.Valid() {
		c.installer.install(ctx, c.outputFile.Path())
		if ctx.Failed() {
			return
		}
	}
}

func (c *Module) toolchain(ctx BaseModuleContext) config.Toolchain {
	if c.cachedToolchain == nil {
		c.cachedToolchain = config.FindToolchain(ctx.Os(), ctx.Arch())
	}
	return c.cachedToolchain
}

func (c *Module) begin(ctx BaseModuleContext) {
	if c.compiler != nil {
		c.compiler.compilerInit(ctx)
	}
	if c.linker != nil {
		c.linker.linkerInit(ctx)
	}
	if c.stl != nil {
		c.stl.begin(ctx)
	}
	if c.sanitize != nil {
		c.sanitize.begin(ctx)
	}
	if c.coverage != nil {
		c.coverage.begin(ctx)
	}
	if c.sabi != nil {
		c.sabi.begin(ctx)
	}
	if c.vndkdep != nil {
		c.vndkdep.begin(ctx)
	}
	if c.lto != nil {
		c.lto.begin(ctx)
	}
	if c.pgo != nil {
		c.pgo.begin(ctx)
	}
	for _, feature := range c.features {
		feature.begin(ctx)
	}
	if ctx.useSdk() {
		version, err := normalizeNdkApiLevel(ctx, ctx.sdkVersion(), ctx.Arch())
		if err != nil {
			ctx.PropertyErrorf("sdk_version", err.Error())
		}
		c.Properties.Sdk_version = StringPtr(version)
	}
}

func (c *Module) deps(ctx DepsContext) Deps {
	deps := Deps{}

	if c.compiler != nil {
		deps = c.compiler.compilerDeps(ctx, deps)
	}
	// Add the PGO dependency (the clang_rt.profile runtime library), which
	// sometimes depends on symbols from libgcc, before libgcc gets added
	// in linkerDeps().
	if c.pgo != nil {
		deps = c.pgo.deps(ctx, deps)
	}
	if c.linker != nil {
		deps = c.linker.linkerDeps(ctx, deps)
	}
	if c.stl != nil {
		deps = c.stl.deps(ctx, deps)
	}
	if c.sanitize != nil {
		deps = c.sanitize.deps(ctx, deps)
	}
	if c.coverage != nil {
		deps = c.coverage.deps(ctx, deps)
	}
	if c.sabi != nil {
		deps = c.sabi.deps(ctx, deps)
	}
	if c.vndkdep != nil {
		deps = c.vndkdep.deps(ctx, deps)
	}
	if c.lto != nil {
		deps = c.lto.deps(ctx, deps)
	}
	for _, feature := range c.features {
		deps = feature.deps(ctx, deps)
	}

	deps.WholeStaticLibs = android.LastUniqueStrings(deps.WholeStaticLibs)
	deps.StaticLibs = android.LastUniqueStrings(deps.StaticLibs)
	deps.LateStaticLibs = android.LastUniqueStrings(deps.LateStaticLibs)
	deps.SharedLibs = android.LastUniqueStrings(deps.SharedLibs)
	deps.LateSharedLibs = android.LastUniqueStrings(deps.LateSharedLibs)
	deps.HeaderLibs = android.LastUniqueStrings(deps.HeaderLibs)
	deps.RuntimeLibs = android.LastUniqueStrings(deps.RuntimeLibs)

	for _, lib := range deps.ReexportSharedLibHeaders {
		if !inList(lib, deps.SharedLibs) {
			ctx.PropertyErrorf("export_shared_lib_headers", "Shared library not in shared_libs: '%s'", lib)
		}
	}

	for _, lib := range deps.ReexportStaticLibHeaders {
		if !inList(lib, deps.StaticLibs) {
			ctx.PropertyErrorf("export_static_lib_headers", "Static library not in static_libs: '%s'", lib)
		}
	}

	for _, lib := range deps.ReexportHeaderLibHeaders {
		if !inList(lib, deps.HeaderLibs) {
			ctx.PropertyErrorf("export_header_lib_headers", "Header library not in header_libs: '%s'", lib)
		}
	}

	for _, gen := range deps.ReexportGeneratedHeaders {
		if !inList(gen, deps.GeneratedHeaders) {
			ctx.PropertyErrorf("export_generated_headers", "Generated header module not in generated_headers: '%s'", gen)
		}
	}

	return deps
}

func (c *Module) beginMutator(actx android.BottomUpMutatorContext) {
	ctx := &baseModuleContext{
		BaseContext: actx,
		moduleContextImpl: moduleContextImpl{
			mod: c,
		},
	}
	ctx.ctx = ctx

	c.begin(ctx)
}

// Split name#version into name and version
func stubsLibNameAndVersion(name string) (string, string) {
	if sharp := strings.LastIndex(name, "#"); sharp != -1 && sharp != len(name)-1 {
		version := name[sharp+1:]
		libname := name[:sharp]
		return libname, version
	}
	return name, ""
}

func (c *Module) DepsMutator(actx android.BottomUpMutatorContext) {
	ctx := &depsContext{
		BottomUpMutatorContext: actx,
		moduleContextImpl: moduleContextImpl{
			mod: c,
		},
	}
	ctx.ctx = ctx

	deps := c.deps(ctx)

	variantNdkLibs := []string{}
	variantLateNdkLibs := []string{}
	if ctx.Os() == android.Android {
		version := ctx.sdkVersion()

		// rewriteNdkLibs takes a list of names of shared libraries and scans it for three types
		// of names:
		//
		// 1. Name of an NDK library that refers to a prebuilt module.
		//    For each of these, it adds the name of the prebuilt module (which will be in
		//    prebuilts/ndk) to the list of nonvariant libs.
		// 2. Name of an NDK library that refers to an ndk_library module.
		//    For each of these, it adds the name of the ndk_library module to the list of
		//    variant libs.
		// 3. Anything else (so anything that isn't an NDK library).
		//    It adds these to the nonvariantLibs list.
		//
		// The caller can then know to add the variantLibs dependencies differently from the
		// nonvariantLibs
		rewriteNdkLibs := func(list []string) (nonvariantLibs []string, variantLibs []string) {
			variantLibs = []string{}
			nonvariantLibs = []string{}
			for _, entry := range list {
				// strip #version suffix out
				name, _ := stubsLibNameAndVersion(entry)
				if ctx.useSdk() && inList(name, ndkPrebuiltSharedLibraries) {
					if !inList(name, ndkMigratedLibs) {
						nonvariantLibs = append(nonvariantLibs, name+".ndk."+version)
					} else {
						variantLibs = append(variantLibs, name+ndkLibrarySuffix)
					}
				} else if ctx.useVndk() && inList(name, llndkLibraries) {
					nonvariantLibs = append(nonvariantLibs, name+llndkLibrarySuffix)
				} else if (ctx.Platform() || ctx.ProductSpecific()) && inList(name, vendorPublicLibraries) {
					vendorPublicLib := name + vendorPublicLibrarySuffix
					if actx.OtherModuleExists(vendorPublicLib) {
						nonvariantLibs = append(nonvariantLibs, vendorPublicLib)
					} else {
						// This can happen if vendor_public_library module is defined in a
						// namespace that isn't visible to the current module. In that case,
						// link to the original library.
						nonvariantLibs = append(nonvariantLibs, name)
					}
				} else {
					// put name#version back
					nonvariantLibs = append(nonvariantLibs, entry)
				}
			}
			return nonvariantLibs, variantLibs
		}

		deps.SharedLibs, variantNdkLibs = rewriteNdkLibs(deps.SharedLibs)
		deps.LateSharedLibs, variantLateNdkLibs = rewriteNdkLibs(deps.LateSharedLibs)
		deps.ReexportSharedLibHeaders, _ = rewriteNdkLibs(deps.ReexportSharedLibHeaders)
	}

	if c.linker != nil {
		if library, ok := c.linker.(*libraryDecorator); ok {
			if library.buildStubs() {
				// Stubs lib does not have dependency to other libraries. Don't proceed.
				return
			}
		}
	}

	for _, lib := range deps.HeaderLibs {
		depTag := headerDepTag
		if inList(lib, deps.ReexportHeaderLibHeaders) {
			depTag = headerExportDepTag
		}
		actx.AddVariationDependencies(nil, depTag, lib)
	}

	actx.AddVariationDependencies([]blueprint.Variation{
		{Mutator: "link", Variation: "static"},
	}, wholeStaticDepTag, deps.WholeStaticLibs...)

	for _, lib := range deps.StaticLibs {
		depTag := staticDepTag
		if inList(lib, deps.ReexportStaticLibHeaders) {
			depTag = staticExportDepTag
		}
		actx.AddVariationDependencies([]blueprint.Variation{
			{Mutator: "link", Variation: "static"},
		}, depTag, lib)
	}

	actx.AddVariationDependencies([]blueprint.Variation{
		{Mutator: "link", Variation: "static"},
	}, lateStaticDepTag, deps.LateStaticLibs...)

	// shared lib names without the #version suffix
	var sharedLibNames []string

	for _, lib := range deps.SharedLibs {
		name, version := stubsLibNameAndVersion(lib)
		sharedLibNames = append(sharedLibNames, name)
		depTag := sharedDepTag
		if inList(lib, deps.ReexportSharedLibHeaders) {
			depTag = sharedExportDepTag
		}
		var variations []blueprint.Variation
		variations = append(variations, blueprint.Variation{Mutator: "link", Variation: "shared"})
		if version != "" && ctx.Os() == android.Android && !ctx.useVndk() && !c.inRecovery() {
			variations = append(variations, blueprint.Variation{Mutator: "version", Variation: version})
		}
		actx.AddVariationDependencies(variations, depTag, name)
	}

	for _, lib := range deps.LateSharedLibs {
		name, version := stubsLibNameAndVersion(lib)
		if inList(name, sharedLibNames) {
			// This is to handle the case that some of the late shared libs (libc, libdl, libm, ...)
			// are added also to SharedLibs with version (e.g., libc#10). If not skipped, we will be
			// linking against both the stubs lib and the non-stubs lib at the same time.
			continue
		}
		depTag := lateSharedDepTag
		var variations []blueprint.Variation
		variations = append(variations, blueprint.Variation{Mutator: "link", Variation: "shared"})
		if version != "" && ctx.Os() == android.Android && !ctx.useVndk() && !c.inRecovery() {
			variations = append(variations, blueprint.Variation{Mutator: "version", Variation: version})
		}
		actx.AddVariationDependencies(variations, depTag, name)
	}

	actx.AddVariationDependencies([]blueprint.Variation{
		{Mutator: "link", Variation: "shared"},
	}, runtimeDepTag, deps.RuntimeLibs...)

	actx.AddDependency(c, genSourceDepTag, deps.GeneratedSources...)

	for _, gen := range deps.GeneratedHeaders {
		depTag := genHeaderDepTag
		if inList(gen, deps.ReexportGeneratedHeaders) {
			depTag = genHeaderExportDepTag
		}
		actx.AddDependency(c, depTag, gen)
	}

	actx.AddVariationDependencies(nil, objDepTag, deps.ObjFiles...)

	if deps.CrtBegin != "" {
		actx.AddVariationDependencies(nil, crtBeginDepTag, deps.CrtBegin)
	}
	if deps.CrtEnd != "" {
		actx.AddVariationDependencies(nil, crtEndDepTag, deps.CrtEnd)
	}
	if deps.LinkerFlagsFile != "" {
		actx.AddDependency(c, linkerFlagsDepTag, deps.LinkerFlagsFile)
	}
	if deps.DynamicLinker != "" {
		actx.AddDependency(c, dynamicLinkerDepTag, deps.DynamicLinker)
	}

	version := ctx.sdkVersion()
	actx.AddVariationDependencies([]blueprint.Variation{
		{Mutator: "ndk_api", Variation: version},
		{Mutator: "link", Variation: "shared"},
	}, ndkStubDepTag, variantNdkLibs...)
	actx.AddVariationDependencies([]blueprint.Variation{
		{Mutator: "ndk_api", Variation: version},
		{Mutator: "link", Variation: "shared"},
	}, ndkLateStubDepTag, variantLateNdkLibs...)

	if vndkdep := c.vndkdep; vndkdep != nil {
		if vndkdep.isVndkExt() {
			baseModuleMode := vendorMode
			if actx.DeviceConfig().VndkVersion() == "" {
				baseModuleMode = coreMode
			}
			actx.AddVariationDependencies([]blueprint.Variation{
				{Mutator: "image", Variation: baseModuleMode},
				{Mutator: "link", Variation: "shared"},
			}, vndkExtDepTag, vndkdep.getVndkExtendsModuleName())
		}
	}
}

func BeginMutator(ctx android.BottomUpMutatorContext) {
	if c, ok := ctx.Module().(*Module); ok && c.Enabled() {
		c.beginMutator(ctx)
	}
}

// Whether a module can link to another module, taking into
// account NDK linking.
func checkLinkType(ctx android.ModuleContext, from *Module, to *Module, tag dependencyTag) {
	if from.Target().Os != android.Android {
		// Host code is not restricted
		return
	}
	if from.Properties.UseVndk {
		// Though vendor code is limited by the vendor mutator,
		// each vendor-available module needs to check
		// link-type for VNDK.
		if from.vndkdep != nil {
			from.vndkdep.vndkCheckLinkType(ctx, to, tag)
		}
		return
	}
	if String(from.Properties.Sdk_version) == "" {
		// Platform code can link to anything
		return
	}
	if from.inRecovery() {
		// Recovery code is not NDK
		return
	}
	if _, ok := to.linker.(*toolchainLibraryDecorator); ok {
		// These are always allowed
		return
	}
	if _, ok := to.linker.(*ndkPrebuiltStlLinker); ok {
		// These are allowed, but they don't set sdk_version
		return
	}
	if _, ok := to.linker.(*stubDecorator); ok {
		// These aren't real libraries, but are the stub shared libraries that are included in
		// the NDK.
		return
	}
	if String(to.Properties.Sdk_version) == "" {
		// NDK code linking to platform code is never okay.
		ctx.ModuleErrorf("depends on non-NDK-built library %q",
			ctx.OtherModuleName(to))
	}

	// At this point we know we have two NDK libraries, but we need to
	// check that we're not linking against anything built against a higher
	// API level, as it is only valid to link against older or equivalent
	// APIs.

	// Current can link against anything.
	if String(from.Properties.Sdk_version) != "current" {
		// Otherwise we need to check.
		if String(to.Properties.Sdk_version) == "current" {
			// Current can't be linked against by anything else.
			ctx.ModuleErrorf("links %q built against newer API version %q",
				ctx.OtherModuleName(to), "current")
		} else {
			fromApi, err := strconv.Atoi(String(from.Properties.Sdk_version))
			if err != nil {
				ctx.PropertyErrorf("sdk_version",
					"Invalid sdk_version value (must be int or current): %q",
					String(from.Properties.Sdk_version))
			}
			toApi, err := strconv.Atoi(String(to.Properties.Sdk_version))
			if err != nil {
				ctx.PropertyErrorf("sdk_version",
					"Invalid sdk_version value (must be int or current): %q",
					String(to.Properties.Sdk_version))
			}

			if toApi > fromApi {
				ctx.ModuleErrorf("links %q built against newer API version %q",
					ctx.OtherModuleName(to), String(to.Properties.Sdk_version))
			}
		}
	}

	// Also check that the two STL choices are compatible.
	fromStl := from.stl.Properties.SelectedStl
	toStl := to.stl.Properties.SelectedStl
	if fromStl == "" || toStl == "" {
		// Libraries that don't use the STL are unrestricted.
	} else if fromStl == "ndk_system" || toStl == "ndk_system" {
		// We can be permissive with the system "STL" since it is only the C++
		// ABI layer, but in the future we should make sure that everyone is
		// using either libc++ or nothing.
	} else if getNdkStlFamily(from) != getNdkStlFamily(to) {
		ctx.ModuleErrorf("uses %q and depends on %q which uses incompatible %q",
			from.stl.Properties.SelectedStl, ctx.OtherModuleName(to),
			to.stl.Properties.SelectedStl)
	}
}

// Tests whether the dependent library is okay to be double loaded inside a single process.
// If a library is a member of VNDK and at the same time dependencies of an LLNDK library,
// it is subject to be double loaded. Such lib should be explicitly marked as double_loaded: true
// or as vndk-sp (vndk: { enabled: true, support_system_process: true}).
func checkDoubleLoadableLibries(ctx android.ModuleContext, from *Module, to *Module) {
	if _, ok := from.linker.(*libraryDecorator); !ok {
		return
	}

	if inList(ctx.ModuleName(), llndkLibraries) ||
		(from.useVndk() && Bool(from.VendorProperties.Double_loadable)) {
		_, depIsLlndk := to.linker.(*llndkStubDecorator)
		depIsVndkSp := false
		if to.vndkdep != nil && to.vndkdep.isVndkSp() {
			depIsVndkSp = true
		}
		depIsVndk := false
		if to.vndkdep != nil && to.vndkdep.isVndk() {
			depIsVndk = true
		}
		depIsDoubleLoadable := Bool(to.VendorProperties.Double_loadable)
		if !depIsLlndk && !depIsVndkSp && !depIsDoubleLoadable && depIsVndk {
			ctx.ModuleErrorf("links VNDK library %q that isn't double_loadable.",
				ctx.OtherModuleName(to))
		}
	}
}

// Convert dependencies to paths.  Returns a PathDeps containing paths
func (c *Module) depsToPaths(ctx android.ModuleContext) PathDeps {
	var depPaths PathDeps

	directStaticDeps := []*Module{}
	directSharedDeps := []*Module{}

	ctx.VisitDirectDeps(func(dep android.Module) {
		depName := ctx.OtherModuleName(dep)
		depTag := ctx.OtherModuleDependencyTag(dep)

		ccDep, _ := dep.(*Module)
		if ccDep == nil {
			// handling for a few module types that aren't cc Module but that are also supported
			switch depTag {
			case genSourceDepTag:
				if genRule, ok := dep.(genrule.SourceFileGenerator); ok {
					depPaths.GeneratedSources = append(depPaths.GeneratedSources,
						genRule.GeneratedSourceFiles()...)
				} else {
					ctx.ModuleErrorf("module %q is not a gensrcs or genrule", depName)
				}
				// Support exported headers from a generated_sources dependency
				fallthrough
			case genHeaderDepTag, genHeaderExportDepTag:
				if genRule, ok := dep.(genrule.SourceFileGenerator); ok {
					depPaths.GeneratedHeaders = append(depPaths.GeneratedHeaders,
						genRule.GeneratedDeps()...)
					flags := includeDirsToFlags(genRule.GeneratedHeaderDirs())
					depPaths.Flags = append(depPaths.Flags, flags)
					if depTag == genHeaderExportDepTag {
						depPaths.ReexportedFlags = append(depPaths.ReexportedFlags, flags)
						depPaths.ReexportedFlagsDeps = append(depPaths.ReexportedFlagsDeps,
							genRule.GeneratedDeps()...)
						// Add these re-exported flags to help header-abi-dumper to infer the abi exported by a library.
						c.sabi.Properties.ReexportedIncludeFlags = append(c.sabi.Properties.ReexportedIncludeFlags, flags)

					}
				} else {
					ctx.ModuleErrorf("module %q is not a genrule", depName)
				}
			case linkerFlagsDepTag:
				if genRule, ok := dep.(genrule.SourceFileGenerator); ok {
					files := genRule.GeneratedSourceFiles()
					if len(files) == 1 {
						depPaths.LinkerFlagsFile = android.OptionalPathForPath(files[0])
					} else if len(files) > 1 {
						ctx.ModuleErrorf("module %q can only generate a single file if used for a linker flag file", depName)
					}
				} else {
					ctx.ModuleErrorf("module %q is not a genrule", depName)
				}
			}
			return
		}

		if dep.Target().Os != ctx.Os() {
			ctx.ModuleErrorf("OS mismatch between %q and %q", ctx.ModuleName(), depName)
			return
		}
		if dep.Target().Arch.ArchType != ctx.Arch().ArchType {
			ctx.ModuleErrorf("Arch mismatch between %q and %q", ctx.ModuleName(), depName)
			return
		}

		// re-exporting flags
		if depTag == reuseObjTag {
			if l, ok := ccDep.compiler.(libraryInterface); ok {
				c.staticVariant = ccDep
				objs, flags, deps := l.reuseObjs()
				depPaths.Objs = depPaths.Objs.Append(objs)
				depPaths.ReexportedFlags = append(depPaths.ReexportedFlags, flags...)
				depPaths.ReexportedFlagsDeps = append(depPaths.ReexportedFlagsDeps, deps...)
				return
			}
		}
		if t, ok := depTag.(dependencyTag); ok && t.library {
			if i, ok := ccDep.linker.(exportedFlagsProducer); ok {
				flags := i.exportedFlags()
				deps := i.exportedFlagsDeps()
				depPaths.Flags = append(depPaths.Flags, flags...)
				depPaths.GeneratedHeaders = append(depPaths.GeneratedHeaders, deps...)

				if t.reexportFlags {
					depPaths.ReexportedFlags = append(depPaths.ReexportedFlags, flags...)
					depPaths.ReexportedFlagsDeps = append(depPaths.ReexportedFlagsDeps, deps...)
					// Add these re-exported flags to help header-abi-dumper to infer the abi exported by a library.
					// Re-exported shared library headers must be included as well since they can help us with type information
					// about template instantiations (instantiated from their headers).
					c.sabi.Properties.ReexportedIncludeFlags = append(c.sabi.Properties.ReexportedIncludeFlags, flags...)
				}
			}

			checkLinkType(ctx, c, ccDep, t)
			checkDoubleLoadableLibries(ctx, c, ccDep)
		}

		var ptr *android.Paths
		var depPtr *android.Paths

		linkFile := ccDep.outputFile
		depFile := android.OptionalPath{}

		switch depTag {
		case ndkStubDepTag, sharedDepTag, sharedExportDepTag:
			ptr = &depPaths.SharedLibs
			depPtr = &depPaths.SharedLibsDeps
			depFile = ccDep.linker.(libraryInterface).toc()
			directSharedDeps = append(directSharedDeps, ccDep)
		case lateSharedDepTag, ndkLateStubDepTag:
			ptr = &depPaths.LateSharedLibs
			depPtr = &depPaths.LateSharedLibsDeps
			depFile = ccDep.linker.(libraryInterface).toc()
		case staticDepTag, staticExportDepTag:
			ptr = nil
			directStaticDeps = append(directStaticDeps, ccDep)
		case lateStaticDepTag:
			ptr = &depPaths.LateStaticLibs
		case wholeStaticDepTag:
			ptr = &depPaths.WholeStaticLibs
			staticLib, ok := ccDep.linker.(libraryInterface)
			if !ok || !staticLib.static() {
				ctx.ModuleErrorf("module %q not a static library", depName)
				return
			}

			if missingDeps := staticLib.getWholeStaticMissingDeps(); missingDeps != nil {
				postfix := " (required by " + ctx.OtherModuleName(dep) + ")"
				for i := range missingDeps {
					missingDeps[i] += postfix
				}
				ctx.AddMissingDependencies(missingDeps)
			}
			depPaths.WholeStaticLibObjs = depPaths.WholeStaticLibObjs.Append(staticLib.objs())
		case headerDepTag:
			// Nothing
		case objDepTag:
			depPaths.Objs.objFiles = append(depPaths.Objs.objFiles, linkFile.Path())
		case crtBeginDepTag:
			depPaths.CrtBegin = linkFile
		case crtEndDepTag:
			depPaths.CrtEnd = linkFile
		case dynamicLinkerDepTag:
			depPaths.DynamicLinker = linkFile
		}

		switch depTag {
		case staticDepTag, staticExportDepTag, lateStaticDepTag:
			staticLib, ok := ccDep.linker.(libraryInterface)
			if !ok || !staticLib.static() {
				ctx.ModuleErrorf("module %q not a static library", depName)
				return
			}

			// When combining coverage files for shared libraries and executables, coverage files
			// in static libraries act as if they were whole static libraries. The same goes for
			// source based Abi dump files.
			depPaths.StaticLibObjs.coverageFiles = append(depPaths.StaticLibObjs.coverageFiles,
				staticLib.objs().coverageFiles...)
			depPaths.StaticLibObjs.sAbiDumpFiles = append(depPaths.StaticLibObjs.sAbiDumpFiles,
				staticLib.objs().sAbiDumpFiles...)

		}

		if ptr != nil {
			if !linkFile.Valid() {
				ctx.ModuleErrorf("module %q missing output file", depName)
				return
			}
			*ptr = append(*ptr, linkFile.Path())
		}

		if depPtr != nil {
			dep := depFile
			if !dep.Valid() {
				dep = linkFile
			}
			*depPtr = append(*depPtr, dep.Path())
		}

		makeLibName := func(depName string) string {
			libName := strings.TrimSuffix(depName, llndkLibrarySuffix)
			libName = strings.TrimSuffix(libName, vendorPublicLibrarySuffix)
			libName = strings.TrimPrefix(libName, "prebuilt_")
			isLLndk := inList(libName, llndkLibraries)
			isVendorPublicLib := inList(libName, vendorPublicLibraries)
			bothVendorAndCoreVariantsExist := ccDep.hasVendorVariant() || isLLndk
			if c.useVndk() && bothVendorAndCoreVariantsExist {
				// The vendor module in Make will have been renamed to not conflict with the core
				// module, so update the dependency name here accordingly.
				return libName + vendorSuffix
			} else if (ctx.Platform() || ctx.ProductSpecific()) && isVendorPublicLib {
				return libName + vendorPublicLibrarySuffix
			} else if ccDep.inRecovery() && !ccDep.onlyInRecovery() {
				return libName + recoverySuffix
			} else {
				return libName
			}
		}

		// Export the shared libs to Make.
		switch depTag {
		case sharedDepTag, sharedExportDepTag, lateSharedDepTag:
			// Note: the order of libs in this list is not important because
			// they merely serve as Make dependencies and do not affect this lib itself.
			c.Properties.AndroidMkSharedLibs = append(
				c.Properties.AndroidMkSharedLibs, makeLibName(depName))
		case staticDepTag, staticExportDepTag, lateStaticDepTag:
			c.Properties.AndroidMkStaticLibs = append(
				c.Properties.AndroidMkStaticLibs, makeLibName(depName))
		case runtimeDepTag:
			c.Properties.AndroidMkRuntimeLibs = append(
				c.Properties.AndroidMkRuntimeLibs, makeLibName(depName))
		case wholeStaticDepTag:
			c.Properties.AndroidMkWholeStaticLibs = append(
				c.Properties.AndroidMkWholeStaticLibs, makeLibName(depName))
		}
	})

	// use the ordered dependencies as this module's dependencies
	depPaths.StaticLibs = append(depPaths.StaticLibs, orderStaticModuleDeps(c, directStaticDeps, directSharedDeps)...)

	// Dedup exported flags from dependencies
	depPaths.Flags = android.FirstUniqueStrings(depPaths.Flags)
	depPaths.GeneratedHeaders = android.FirstUniquePaths(depPaths.GeneratedHeaders)
	depPaths.ReexportedFlags = android.FirstUniqueStrings(depPaths.ReexportedFlags)
	depPaths.ReexportedFlagsDeps = android.FirstUniquePaths(depPaths.ReexportedFlagsDeps)

	if c.sabi != nil {
		c.sabi.Properties.ReexportedIncludeFlags = android.FirstUniqueStrings(c.sabi.Properties.ReexportedIncludeFlags)
	}

	return depPaths
}

func (c *Module) InstallInData() bool {
	if c.installer == nil {
		return false
	}
	return c.installer.inData()
}

func (c *Module) InstallInSanitizerDir() bool {
	if c.installer == nil {
		return false
	}
	if c.sanitize != nil && c.sanitize.inSanitizerDir() {
		return true
	}
	return c.installer.inSanitizerDir()
}

func (c *Module) InstallInRecovery() bool {
	return c.inRecovery()
}

func (c *Module) HostToolPath() android.OptionalPath {
	if c.installer == nil {
		return android.OptionalPath{}
	}
	return c.installer.hostToolPath()
}

func (c *Module) IntermPathForModuleOut() android.OptionalPath {
	return c.outputFile
}

func (c *Module) Srcs() android.Paths {
	if c.outputFile.Valid() {
		return android.Paths{c.outputFile.Path()}
	}
	return android.Paths{}
}

func (c *Module) static() bool {
	if static, ok := c.linker.(interface {
		static() bool
	}); ok {
		return static.static()
	}
	return false
}

func (c *Module) getMakeLinkType() string {
	if c.useVndk() {
		if inList(c.Name(), vndkCoreLibraries) || inList(c.Name(), vndkSpLibraries) || inList(c.Name(), llndkLibraries) {
			if inList(c.Name(), vndkPrivateLibraries) {
				return "native:vndk_private"
			} else {
				return "native:vndk"
			}
		} else {
			return "native:vendor"
		}
	} else if c.inRecovery() {
		return "native:recovery"
	} else if c.Target().Os == android.Android && String(c.Properties.Sdk_version) != "" {
		return "native:ndk:none:none"
		// TODO(b/114741097): use the correct ndk stl once build errors have been fixed
		//family, link := getNdkStlFamilyAndLinkType(c)
		//return fmt.Sprintf("native:ndk:%s:%s", family, link)
	} else {
		return "native:platform"
	}
}

// Overrides ApexModule.IsInstallabeToApex()
// Only shared libraries are installable to APEX.
func (c *Module) IsInstallableToApex() bool {
	if shared, ok := c.linker.(interface {
		shared() bool
	}); ok {
		return shared.shared()
	}
	return false
}

//
// Defaults
//
type Defaults struct {
	android.ModuleBase
	android.DefaultsModuleBase
	android.ApexModuleBase
}

func (*Defaults) GenerateAndroidBuildActions(ctx android.ModuleContext) {
}

func (d *Defaults) DepsMutator(ctx android.BottomUpMutatorContext) {
}

func defaultsFactory() android.Module {
	return DefaultsFactory()
}

func DefaultsFactory(props ...interface{}) android.Module {
	module := &Defaults{}

	module.AddProperties(props...)
	module.AddProperties(
		&BaseProperties{},
		&VendorProperties{},
		&BaseCompilerProperties{},
		&BaseLinkerProperties{},
		&LibraryProperties{},
		&FlagExporterProperties{},
		&BinaryLinkerProperties{},
		&TestProperties{},
		&TestBinaryProperties{},
		&StlProperties{},
		&SanitizeProperties{},
		&StripProperties{},
		&InstallerProperties{},
		&TidyProperties{},
		&CoverageProperties{},
		&SAbiProperties{},
		&VndkProperties{},
		&LTOProperties{},
		&PgoProperties{},
		&android.ProtoProperties{},
	)

	android.InitDefaultsModule(module)
	android.InitApexModule(module)

	return module
}

const (
	// coreMode is the variant used for framework-private libraries, or
	// SDK libraries. (which framework-private libraries can use)
	coreMode = "core"

	// vendorMode is the variant used for /vendor code that compiles
	// against the VNDK.
	vendorMode = "vendor"

	recoveryMode = "recovery"
)

func squashVendorSrcs(m *Module) {
	if lib, ok := m.compiler.(*libraryDecorator); ok {
		lib.baseCompiler.Properties.Srcs = append(lib.baseCompiler.Properties.Srcs,
			lib.baseCompiler.Properties.Target.Vendor.Srcs...)

		lib.baseCompiler.Properties.Exclude_srcs = append(lib.baseCompiler.Properties.Exclude_srcs,
			lib.baseCompiler.Properties.Target.Vendor.Exclude_srcs...)
	}
}

func squashRecoverySrcs(m *Module) {
	if lib, ok := m.compiler.(*libraryDecorator); ok {
		lib.baseCompiler.Properties.Srcs = append(lib.baseCompiler.Properties.Srcs,
			lib.baseCompiler.Properties.Target.Recovery.Srcs...)

		lib.baseCompiler.Properties.Exclude_srcs = append(lib.baseCompiler.Properties.Exclude_srcs,
			lib.baseCompiler.Properties.Target.Recovery.Exclude_srcs...)
	}
}

func imageMutator(mctx android.BottomUpMutatorContext) {
	if mctx.Os() != android.Android {
		return
	}

	if g, ok := mctx.Module().(*genrule.Module); ok {
		if props, ok := g.Extra.(*GenruleExtraProperties); ok {
			var coreVariantNeeded bool = false
			var vendorVariantNeeded bool = false
			var recoveryVariantNeeded bool = false
			if mctx.DeviceConfig().VndkVersion() == "" {
				coreVariantNeeded = true
			} else if Bool(props.Vendor_available) {
				coreVariantNeeded = true
				vendorVariantNeeded = true
			} else if mctx.SocSpecific() || mctx.DeviceSpecific() {
				vendorVariantNeeded = true
			} else {
				coreVariantNeeded = true
			}
			if Bool(props.Recovery_available) {
				recoveryVariantNeeded = true
			}

			if recoveryVariantNeeded {
				primaryArch := mctx.Config().DevicePrimaryArchType()
				moduleArch := g.Target().Arch.ArchType
				if moduleArch != primaryArch {
					recoveryVariantNeeded = false
				}
			}

			var variants []string
			if coreVariantNeeded {
				variants = append(variants, coreMode)
			}
			if vendorVariantNeeded {
				variants = append(variants, vendorMode)
			}
			if recoveryVariantNeeded {
				variants = append(variants, recoveryMode)
			}
			mod := mctx.CreateVariations(variants...)
			for i, v := range variants {
				if v == recoveryMode {
					m := mod[i].(*genrule.Module)
					m.Extra.(*GenruleExtraProperties).InRecovery = true
				}
			}
		}
	}

	m, ok := mctx.Module().(*Module)
	if !ok {
		return
	}

	// Sanity check
	vendorSpecific := mctx.SocSpecific() || mctx.DeviceSpecific()

	if m.VendorProperties.Vendor_available != nil && vendorSpecific {
		mctx.PropertyErrorf("vendor_available",
			"doesn't make sense at the same time as `vendor: true`, `proprietary: true`, or `device_specific:true`")
		return
	}

	if vndkdep := m.vndkdep; vndkdep != nil {
		if vndkdep.isVndk() {
			if vendorSpecific {
				if !vndkdep.isVndkExt() {
					mctx.PropertyErrorf("vndk",
						"must set `extends: \"...\"` to vndk extension")
					return
				}
			} else {
				if vndkdep.isVndkExt() {
					mctx.PropertyErrorf("vndk",
						"must set `vendor: true` to set `extends: %q`",
						m.getVndkExtendsModuleName())
					return
				}
				if m.VendorProperties.Vendor_available == nil {
					mctx.PropertyErrorf("vndk",
						"vendor_available must be set to either true or false when `vndk: {enabled: true}`")
					return
				}
			}
		} else {
			if vndkdep.isVndkSp() {
				mctx.PropertyErrorf("vndk",
					"must set `enabled: true` to set `support_system_process: true`")
				return
			}
			if vndkdep.isVndkExt() {
				mctx.PropertyErrorf("vndk",
					"must set `enabled: true` to set `extends: %q`",
					m.getVndkExtendsModuleName())
				return
			}
		}
	}

	var coreVariantNeeded bool = false
	var vendorVariantNeeded bool = false
	var recoveryVariantNeeded bool = false

	if mctx.DeviceConfig().VndkVersion() == "" {
		// If the device isn't compiling against the VNDK, we always
		// use the core mode.
		coreVariantNeeded = true
	} else if _, ok := m.linker.(*llndkStubDecorator); ok {
		// LL-NDK stubs only exist in the vendor variant, since the
		// real libraries will be used in the core variant.
		vendorVariantNeeded = true
	} else if _, ok := m.linker.(*llndkHeadersDecorator); ok {
		// ... and LL-NDK headers as well
		vendorVariantNeeded = true
	} else if _, ok := m.linker.(*vndkPrebuiltLibraryDecorator); ok {
		// Make vendor variants only for the versions in BOARD_VNDK_VERSION and
		// PRODUCT_EXTRA_VNDK_VERSIONS.
		vendorVariantNeeded = true
	} else if m.hasVendorVariant() && !vendorSpecific {
		// This will be available in both /system and /vendor
		// or a /system directory that is available to vendor.
		coreVariantNeeded = true
		vendorVariantNeeded = true
	} else if vendorSpecific && String(m.Properties.Sdk_version) == "" {
		// This will be available in /vendor (or /odm) only
		vendorVariantNeeded = true
	} else {
		// This is either in /system (or similar: /data), or is a
		// modules built with the NDK. Modules built with the NDK
		// will be restricted using the existing link type checks.
		coreVariantNeeded = true
	}

	if Bool(m.Properties.Recovery_available) {
		recoveryVariantNeeded = true
	}

	if m.ModuleBase.InstallInRecovery() {
		recoveryVariantNeeded = true
		coreVariantNeeded = false
	}

	if recoveryVariantNeeded {
		primaryArch := mctx.Config().DevicePrimaryArchType()
		moduleArch := m.Target().Arch.ArchType
		if moduleArch != primaryArch {
			recoveryVariantNeeded = false
		}
	}

	var variants []string
	if coreVariantNeeded {
		variants = append(variants, coreMode)
	}
	if vendorVariantNeeded {
		variants = append(variants, vendorMode)
	}
	if recoveryVariantNeeded {
		variants = append(variants, recoveryMode)
	}
	mod := mctx.CreateVariations(variants...)
	for i, v := range variants {
		if v == vendorMode {
			m := mod[i].(*Module)
			m.Properties.UseVndk = true
			squashVendorSrcs(m)
		} else if v == recoveryMode {
			m := mod[i].(*Module)
			m.Properties.InRecovery = true
			m.MakeAsPlatform()
			squashRecoverySrcs(m)
		}
	}
}

func getCurrentNdkPrebuiltVersion(ctx DepsContext) string {
	if ctx.Config().PlatformSdkVersionInt() > config.NdkMaxPrebuiltVersionInt {
		return strconv.Itoa(config.NdkMaxPrebuiltVersionInt)
	}
	return ctx.Config().PlatformSdkVersion()
}

var Bool = proptools.Bool
var BoolDefault = proptools.BoolDefault
var BoolPtr = proptools.BoolPtr
var String = proptools.String
var StringPtr = proptools.StringPtr