cc/linkable.go

package cc

import (
	"android/soong/android"
	"android/soong/bazel/cquery"
	"android/soong/fuzz"
	"android/soong/snapshot"

	"github.com/google/blueprint"
)

// PlatformSanitizeable is an interface for sanitizing platform modules.
type PlatformSanitizeable interface {
	LinkableInterface

	// SanitizePropDefined returns whether the Sanitizer properties struct for this module is defined.
	SanitizePropDefined() bool

	// IsSanitizerEnabled returns whether a sanitizer is enabled.
	IsSanitizerEnabled(t SanitizerType) bool

	// IsSanitizerExplicitlyDisabled returns whether a sanitizer has been explicitly disabled (set to false) rather
	// than left undefined.
	IsSanitizerExplicitlyDisabled(t SanitizerType) bool

	// SetSanitizer enables or disables the specified sanitizer type if it's supported, otherwise this should panic.
	SetSanitizer(t SanitizerType, b bool)

	// StaticallyLinked returns true if the module is statically linked.
	StaticallyLinked() bool

	// SetInSanitizerDir sets the module installation to the sanitizer directory.
	SetInSanitizerDir()

	// SanitizeNever returns true if this module should never be sanitized.
	SanitizeNever() bool

	// SanitizerSupported returns true if a sanitizer type is supported by this modules compiler.
	SanitizerSupported(t SanitizerType) bool

	// MinimalRuntimeDep returns true if this module needs to link the minimal UBSan runtime,
	// either because it requires it or because a dependent module which requires it to be linked in this module.
	MinimalRuntimeDep() bool

	// UbsanRuntimeDep returns true if this module needs to link the full UBSan runtime,
	// either because it requires it or because a dependent module which requires it to be linked in this module.
	UbsanRuntimeDep() bool

	// UbsanRuntimeNeeded returns true if the full UBSan runtime is required by this module.
	UbsanRuntimeNeeded() bool

	// MinimalRuntimeNeeded returns true if the minimal UBSan runtime is required by this module
	MinimalRuntimeNeeded() bool

	// SanitizableDepTagChecker returns a SantizableDependencyTagChecker function type.
	SanitizableDepTagChecker() SantizableDependencyTagChecker
}

// SantizableDependencyTagChecker functions check whether or not a dependency
// tag can be sanitized. These functions should return true if the tag can be
// sanitized, otherwise they should return false. These functions should also
// handle all possible dependency tags in the dependency tree. For example,
// Rust modules can depend on both Rust and CC libraries, so the Rust module
// implementation should handle tags from both.
type SantizableDependencyTagChecker func(tag blueprint.DependencyTag) bool

// Snapshottable defines those functions necessary for handling module snapshots.
type Snapshottable interface {
	snapshot.VendorSnapshotModuleInterface
	snapshot.RecoverySnapshotModuleInterface

	// SnapshotHeaders returns a list of header paths provided by this module.
	SnapshotHeaders() android.Paths

	// SnapshotLibrary returns true if this module is a snapshot library.
	IsSnapshotLibrary() bool

	// EffectiveLicenseFiles returns the list of License files for this module.
	EffectiveLicenseFiles() android.Paths

	// SnapshotRuntimeLibs returns a list of libraries needed by this module at runtime but which aren't build dependencies.
	SnapshotRuntimeLibs() []string

	// SnapshotSharedLibs returns the list of shared library dependencies for this module.
	SnapshotSharedLibs() []string

	// SnapshotStaticLibs returns the list of static library dependencies for this module.
	SnapshotStaticLibs() []string

	// IsSnapshotPrebuilt returns true if this module is a snapshot prebuilt.
	IsSnapshotPrebuilt() bool
}

// LinkableInterface is an interface for a type of module that is linkable in a C++ library.
type LinkableInterface interface {
	android.Module
	Snapshottable

	Module() android.Module
	CcLibrary() bool
	CcLibraryInterface() bool

	// BaseModuleName returns the android.ModuleBase.BaseModuleName() value for this module.
	BaseModuleName() string

	OutputFile() android.OptionalPath
	UnstrippedOutputFile() android.Path
	CoverageFiles() android.Paths

	// CoverageOutputFile returns the output archive of gcno coverage information files.
	CoverageOutputFile() android.OptionalPath

	NonCcVariants() bool

	SelectedStl() string

	BuildStaticVariant() bool
	BuildSharedVariant() bool
	SetStatic()
	SetShared()
	IsPrebuilt() bool
	Toc() android.OptionalPath

	// IsFuzzModule returns true if this a *_fuzz module.
	IsFuzzModule() bool

	// FuzzPackagedModule returns the fuzz.FuzzPackagedModule for this module.
	// Expects that IsFuzzModule returns true.
	FuzzPackagedModule() fuzz.FuzzPackagedModule

	// FuzzSharedLibraries returns the shared library dependencies for this module.
	// Expects that IsFuzzModule returns true.
	FuzzSharedLibraries() android.RuleBuilderInstalls

	Device() bool
	Host() bool

	InRamdisk() bool
	OnlyInRamdisk() bool

	InVendorRamdisk() bool
	OnlyInVendorRamdisk() bool

	InRecovery() bool
	OnlyInRecovery() bool

	InVendor() bool

	UseSdk() bool

	// IsNdk returns true if the library is in the configs known NDK list.
	IsNdk(config android.Config) bool

	// IsStubs returns true if the this is a stubs library.
	IsStubs() bool

	// IsLlndk returns true for both LLNDK (public) and LLNDK-private libs.
	IsLlndk() bool

	// IsLlndkPublic returns true only for LLNDK (public) libs.
	IsLlndkPublic() bool

	// HasLlndkStubs returns true if this library has a variant that will build LLNDK stubs.
	HasLlndkStubs() bool

	// NeedsLlndkVariants returns true if this module has LLNDK stubs or provides LLNDK headers.
	NeedsLlndkVariants() bool

	// NeedsVendorPublicLibraryVariants returns true if this module has vendor public library stubs.
	NeedsVendorPublicLibraryVariants() bool

	//StubsVersion returns the stubs version for this module.
	StubsVersion() string

	// UseVndk returns true if the module is using VNDK libraries instead of the libraries in /system/lib or /system/lib64.
	// "product" and "vendor" variant modules return true for this function.
	// When BOARD_VNDK_VERSION is set, vendor variants of "vendor_available: true", "vendor: true",
	// "soc_specific: true" and more vendor installed modules are included here.
	// When PRODUCT_PRODUCT_VNDK_VERSION is set, product variants of "vendor_available: true" or
	// "product_specific: true" modules are included here.
	UseVndk() bool

	// Bootstrap tests if this module is allowed to use non-APEX version of libraries.
	Bootstrap() bool

	// IsVndkSp returns true if this is a VNDK-SP module.
	IsVndkSp() bool

	MustUseVendorVariant() bool
	IsVndk() bool
	IsVndkExt() bool
	IsVndkPrivate() bool
	IsVendorPublicLibrary() bool
	IsVndkPrebuiltLibrary() bool
	HasVendorVariant() bool
	HasProductVariant() bool
	HasNonSystemVariants() bool
	ProductSpecific() bool
	InProduct() bool
	SdkAndPlatformVariantVisibleToMake() bool

	// SubName returns the modules SubName, used for image and NDK/SDK variations.
	SubName() string

	SdkVersion() string
	MinSdkVersion() string
	AlwaysSdk() bool
	IsSdkVariant() bool

	SplitPerApiLevel() bool

	// SetPreventInstall sets the PreventInstall property to 'true' for this module.
	SetPreventInstall()
	// SetHideFromMake sets the HideFromMake property to 'true' for this module.
	SetHideFromMake()

	// KernelHeadersDecorator returns true if this is a kernel headers decorator module.
	// This is specific to cc and should always return false for all other packages.
	KernelHeadersDecorator() bool

	// HiddenFromMake returns true if this module is hidden from Make.
	HiddenFromMake() bool

	// RelativeInstallPath returns the relative install path for this module.
	RelativeInstallPath() string

	// Binary returns true if this is a binary module.
	Binary() bool

	// Object returns true if this is an object module.
	Object() bool

	// Rlib returns true if this is an rlib module.
	Rlib() bool

	// Dylib returns true if this is an dylib module.
	Dylib() bool

	// Static returns true if this is a static library module.
	Static() bool

	// Shared returns true if this is a shared library module.
	Shared() bool

	// Header returns true if this is a library headers module.
	Header() bool

	// StaticExecutable returns true if this is a binary module with "static_executable: true".
	StaticExecutable() bool

	// EverInstallable returns true if the module is ever installable
	EverInstallable() bool

	// PreventInstall returns true if this module is prevented from installation.
	PreventInstall() bool

	// InstallInData returns true if this module is installed in data.
	InstallInData() bool

	// Installable returns a bool pointer to the module installable property.
	Installable() *bool

	// Symlinks returns a list of symlinks that should be created for this module.
	Symlinks() []string

	// VndkVersion returns the VNDK version string for this module.
	VndkVersion() string

	// Partition returns the partition string for this module.
	Partition() string

	// FuzzModule returns the fuzz.FuzzModule associated with the module.
	FuzzModuleStruct() fuzz.FuzzModule
}

var (
	// Dependency tag for crtbegin, an object file responsible for initialization.
	CrtBeginDepTag = dependencyTag{name: "crtbegin"}
	// Dependency tag for crtend, an object file responsible for program termination.
	CrtEndDepTag = dependencyTag{name: "crtend"}
	// Dependency tag for coverage library.
	CoverageDepTag = dependencyTag{name: "coverage"}
)

// GetImageVariantType returns the ImageVariantType string value for the given module
// (these are defined in cc/image.go).
func GetImageVariantType(c LinkableInterface) ImageVariantType {
	if c.Host() {
		return hostImageVariant
	} else if c.InVendor() {
		return vendorImageVariant
	} else if c.InProduct() {
		return productImageVariant
	} else if c.InRamdisk() {
		return ramdiskImageVariant
	} else if c.InVendorRamdisk() {
		return vendorRamdiskImageVariant
	} else if c.InRecovery() {
		return recoveryImageVariant
	} else {
		return coreImageVariant
	}
}

// DepTagMakeSuffix returns the makeSuffix value of a particular library dependency tag.
// Returns an empty string if not a library dependency tag.
func DepTagMakeSuffix(depTag blueprint.DependencyTag) string {
	if libDepTag, ok := depTag.(libraryDependencyTag); ok {
		return libDepTag.makeSuffix
	}
	return ""
}

// SharedDepTag returns the dependency tag for any C++ shared libraries.
func SharedDepTag() blueprint.DependencyTag {
	return libraryDependencyTag{Kind: sharedLibraryDependency}
}

// StaticDepTag returns the dependency tag for any C++ static libraries.
func StaticDepTag(wholeStatic bool) blueprint.DependencyTag {
	return libraryDependencyTag{Kind: staticLibraryDependency, wholeStatic: wholeStatic}
}

// IsWholeStaticLib whether a dependency tag is a whole static library dependency.
func IsWholeStaticLib(depTag blueprint.DependencyTag) bool {
	if tag, ok := depTag.(libraryDependencyTag); ok {
		return tag.wholeStatic
	}
	return false
}

// HeaderDepTag returns the dependency tag for any C++ "header-only" libraries.
func HeaderDepTag() blueprint.DependencyTag {
	return libraryDependencyTag{Kind: headerLibraryDependency}
}

// SharedLibraryInfo is a provider to propagate information about a shared C++ library.
type SharedLibraryInfo struct {
	SharedLibrary android.Path
	Target        android.Target

	TableOfContents android.OptionalPath

	// should be obtained from static analogue
	TransitiveStaticLibrariesForOrdering *android.DepSet
}

var SharedLibraryInfoProvider = blueprint.NewProvider(SharedLibraryInfo{})

// SharedStubLibrary is a struct containing information about a stub shared library.
// Stub libraries are used for cross-APEX dependencies; when a library is to depend on a shared
// library in another APEX, it must depend on the stub version of that library.
type SharedStubLibrary struct {
	// The version of the stub (corresponding to the stable version of the shared library being
	// stubbed).
	Version           string
	SharedLibraryInfo SharedLibraryInfo
	FlagExporterInfo  FlagExporterInfo
}

// SharedLibraryStubsInfo is a provider to propagate information about all shared library stubs
// which are dependencies of a library.
// Stub libraries are used for cross-APEX dependencies; when a library is to depend on a shared
// library in another APEX, it must depend on the stub version of that library.
type SharedLibraryStubsInfo struct {
	SharedStubLibraries []SharedStubLibrary

	IsLLNDK bool
}

var SharedLibraryStubsProvider = blueprint.NewProvider(SharedLibraryStubsInfo{})

// StaticLibraryInfo is a provider to propagate information about a static C++ library.
type StaticLibraryInfo struct {
	StaticLibrary android.Path
	Objects       Objects
	ReuseObjects  Objects

	// A static library may contain prebuilt static libraries included with whole_static_libs
	// that won't appear in Objects.  They are transitively available in
	// WholeStaticLibsFromPrebuilts.
	WholeStaticLibsFromPrebuilts android.Paths

	// This isn't the actual transitive DepSet, shared library dependencies have been
	// converted into static library analogues.  It is only used to order the static
	// library dependencies that were specified for the current module.
	TransitiveStaticLibrariesForOrdering *android.DepSet
}

var StaticLibraryInfoProvider = blueprint.NewProvider(StaticLibraryInfo{})

// HeaderLibraryInfo is a marker provider that identifies a module as a header library.
type HeaderLibraryInfo struct {
}

// HeaderLibraryInfoProvider is a marker provider that identifies a module as a header library.
var HeaderLibraryInfoProvider = blueprint.NewProvider(HeaderLibraryInfo{})

// FlagExporterInfo is a provider to propagate transitive library information
// pertaining to exported include paths and flags.
type FlagExporterInfo struct {
	IncludeDirs       android.Paths // Include directories to be included with -I
	SystemIncludeDirs android.Paths // System include directories to be included with -isystem
	Flags             []string      // Exported raw flags.
	Deps              android.Paths
	GeneratedHeaders  android.Paths
}

var FlagExporterInfoProvider = blueprint.NewProvider(FlagExporterInfo{})

// flagExporterInfoFromCcInfo populates FlagExporterInfo provider with information from Bazel.
func flagExporterInfoFromCcInfo(ctx android.ModuleContext, ccInfo cquery.CcInfo) FlagExporterInfo {

	includes := android.PathsForBazelOut(ctx, ccInfo.Includes)
	systemIncludes := android.PathsForBazelOut(ctx, ccInfo.SystemIncludes)
	headers := android.PathsForBazelOut(ctx, ccInfo.Headers)

	return FlagExporterInfo{
		IncludeDirs:       android.FirstUniquePaths(includes),
		SystemIncludeDirs: android.FirstUniquePaths(systemIncludes),
		GeneratedHeaders:  headers,
		// necessary to ensure generated headers are considered implicit deps of dependent actions
		Deps: headers,
	}
}