diff --git a/cc/snapshot_prebuilt.go b/cc/snapshot_prebuilt.go
new file mode 100644
index 0000000..b291bd0
--- /dev/null
+++ b/cc/snapshot_prebuilt.go
@@ -0,0 +1,844 @@
+// Copyright 2020 The Android Open Source Project
+//
+// 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 defines snapshot prebuilt modules, e.g. vendor snapshot and recovery snapshot. Such
+// snapshot modules will override original source modules with setting BOARD_VNDK_VERSION, with
+// snapshot mutators and snapshot information maps which are also defined in this file.
+
+import (
+	"strings"
+	"sync"
+
+	"android/soong/android"
+)
+
+// Defines the specifics of different images to which the snapshot process is applicable, e.g.,
+// vendor, recovery, ramdisk.
+type snapshotImage interface {
+	// Used to register callbacks with the build system.
+	init()
+
+	// Function that returns true if the module is included in this image.
+	// Using a function return instead of a value to prevent early
+	// evalution of a function that may be not be defined.
+	inImage(m *Module) func() bool
+
+	// Returns the value of the "available" property for a given module for
+	// and snapshot, e.g., "vendor_available", "recovery_available", etc.
+	// or nil if the property is not defined.
+	available(m *Module) *bool
+
+	// Returns true if a dir under source tree is an SoC-owned proprietary
+	// directory, such as device/, vendor/, etc.
+	//
+	// For a given snapshot (e.g., vendor, recovery, etc.) if
+	// isProprietaryPath(dir) returns true, then the module in dir will be
+	// built from sources.
+	isProprietaryPath(dir string) bool
+
+	// Whether to include VNDK in the snapshot for this image.
+	includeVndk() bool
+
+	// Whether a given module has been explicitly excluded from the
+	// snapshot, e.g., using the exclude_from_vendor_snapshot or
+	// exclude_from_recovery_snapshot properties.
+	excludeFromSnapshot(m *Module) bool
+}
+
+type vendorSnapshotImage struct{}
+type recoverySnapshotImage struct{}
+
+func (vendorSnapshotImage) init() {
+	android.RegisterSingletonType("vendor-snapshot", VendorSnapshotSingleton)
+	android.RegisterModuleType("vendor_snapshot_shared", VendorSnapshotSharedFactory)
+	android.RegisterModuleType("vendor_snapshot_static", VendorSnapshotStaticFactory)
+	android.RegisterModuleType("vendor_snapshot_header", VendorSnapshotHeaderFactory)
+	android.RegisterModuleType("vendor_snapshot_binary", VendorSnapshotBinaryFactory)
+	android.RegisterModuleType("vendor_snapshot_object", VendorSnapshotObjectFactory)
+}
+
+func (vendorSnapshotImage) inImage(m *Module) func() bool {
+	return m.inVendor
+}
+
+func (vendorSnapshotImage) available(m *Module) *bool {
+	return m.VendorProperties.Vendor_available
+}
+
+func (vendorSnapshotImage) isProprietaryPath(dir string) bool {
+	return isVendorProprietaryPath(dir)
+}
+
+// vendor snapshot includes static/header libraries with vndk: {enabled: true}.
+func (vendorSnapshotImage) includeVndk() bool {
+	return true
+}
+
+func (vendorSnapshotImage) excludeFromSnapshot(m *Module) bool {
+	return m.ExcludeFromVendorSnapshot()
+}
+
+func (recoverySnapshotImage) init() {
+	android.RegisterSingletonType("recovery-snapshot", RecoverySnapshotSingleton)
+	android.RegisterModuleType("recovery_snapshot_shared", RecoverySnapshotSharedFactory)
+	android.RegisterModuleType("recovery_snapshot_static", RecoverySnapshotStaticFactory)
+	android.RegisterModuleType("recovery_snapshot_header", RecoverySnapshotHeaderFactory)
+	android.RegisterModuleType("recovery_snapshot_binary", RecoverySnapshotBinaryFactory)
+	android.RegisterModuleType("recovery_snapshot_object", RecoverySnapshotObjectFactory)
+}
+
+func (recoverySnapshotImage) inImage(m *Module) func() bool {
+	return m.InRecovery
+}
+
+func (recoverySnapshotImage) available(m *Module) *bool {
+	return m.Properties.Recovery_available
+}
+
+func (recoverySnapshotImage) isProprietaryPath(dir string) bool {
+	return isRecoveryProprietaryPath(dir)
+}
+
+// recovery snapshot does NOT treat vndk specially.
+func (recoverySnapshotImage) includeVndk() bool {
+	return false
+}
+
+func (recoverySnapshotImage) excludeFromSnapshot(m *Module) bool {
+	return m.ExcludeFromRecoverySnapshot()
+}
+
+var vendorSnapshotImageSingleton vendorSnapshotImage
+var recoverySnapshotImageSingleton recoverySnapshotImage
+
+func init() {
+	vendorSnapshotImageSingleton.init()
+	recoverySnapshotImageSingleton.init()
+}
+
+const (
+	vendorSnapshotHeaderSuffix = ".vendor_header."
+	vendorSnapshotSharedSuffix = ".vendor_shared."
+	vendorSnapshotStaticSuffix = ".vendor_static."
+	vendorSnapshotBinarySuffix = ".vendor_binary."
+	vendorSnapshotObjectSuffix = ".vendor_object."
+)
+
+const (
+	recoverySnapshotHeaderSuffix = ".recovery_header."
+	recoverySnapshotSharedSuffix = ".recovery_shared."
+	recoverySnapshotStaticSuffix = ".recovery_static."
+	recoverySnapshotBinarySuffix = ".recovery_binary."
+	recoverySnapshotObjectSuffix = ".recovery_object."
+)
+
+var (
+	vendorSnapshotsLock         sync.Mutex
+	vendorSuffixModulesKey      = android.NewOnceKey("vendorSuffixModules")
+	vendorSnapshotHeaderLibsKey = android.NewOnceKey("vendorSnapshotHeaderLibs")
+	vendorSnapshotStaticLibsKey = android.NewOnceKey("vendorSnapshotStaticLibs")
+	vendorSnapshotSharedLibsKey = android.NewOnceKey("vendorSnapshotSharedLibs")
+	vendorSnapshotBinariesKey   = android.NewOnceKey("vendorSnapshotBinaries")
+	vendorSnapshotObjectsKey    = android.NewOnceKey("vendorSnapshotObjects")
+)
+
+// vendorSuffixModules holds names of modules whose vendor variants should have the vendor suffix.
+// This is determined by source modules, and then this will be used when exporting snapshot modules
+// to Makefile.
+//
+// For example, if libbase has "vendor_available: true", the name of core variant will be "libbase"
+// while the name of vendor variant will be "libbase.vendor". In such cases, the vendor snapshot of
+// "libbase" should be exported with the name "libbase.vendor".
+//
+// Refer to VendorSnapshotSourceMutator and makeLibName which use this.
+func vendorSuffixModules(config android.Config) map[string]bool {
+	return config.Once(vendorSuffixModulesKey, func() interface{} {
+		return make(map[string]bool)
+	}).(map[string]bool)
+}
+
+// these are vendor snapshot maps holding names of vendor snapshot modules
+func vendorSnapshotHeaderLibs(config android.Config) *snapshotMap {
+	return config.Once(vendorSnapshotHeaderLibsKey, func() interface{} {
+		return newSnapshotMap()
+	}).(*snapshotMap)
+}
+
+func vendorSnapshotSharedLibs(config android.Config) *snapshotMap {
+	return config.Once(vendorSnapshotSharedLibsKey, func() interface{} {
+		return newSnapshotMap()
+	}).(*snapshotMap)
+}
+
+func vendorSnapshotStaticLibs(config android.Config) *snapshotMap {
+	return config.Once(vendorSnapshotStaticLibsKey, func() interface{} {
+		return newSnapshotMap()
+	}).(*snapshotMap)
+}
+
+func vendorSnapshotBinaries(config android.Config) *snapshotMap {
+	return config.Once(vendorSnapshotBinariesKey, func() interface{} {
+		return newSnapshotMap()
+	}).(*snapshotMap)
+}
+
+func vendorSnapshotObjects(config android.Config) *snapshotMap {
+	return config.Once(vendorSnapshotObjectsKey, func() interface{} {
+		return newSnapshotMap()
+	}).(*snapshotMap)
+}
+
+type baseSnapshotDecoratorProperties struct {
+	// snapshot version.
+	Version string
+
+	// Target arch name of the snapshot (e.g. 'arm64' for variant 'aosp_arm64')
+	Target_arch string
+}
+
+// baseSnapshotDecorator provides common basic functions for all snapshot modules, such as snapshot
+// version, snapshot arch, etc. It also adds a special suffix to Soong module name, so it doesn't
+// collide with source modules. e.g. the following example module,
+//
+// vendor_snapshot_static {
+//     name: "libbase",
+//     arch: "arm64",
+//     version: 30,
+//     ...
+// }
+//
+// will be seen as "libbase.vendor_static.30.arm64" by Soong.
+type baseSnapshotDecorator struct {
+	baseProperties baseSnapshotDecoratorProperties
+	moduleSuffix   string
+}
+
+func (p *baseSnapshotDecorator) Name(name string) string {
+	return name + p.NameSuffix()
+}
+
+func (p *baseSnapshotDecorator) NameSuffix() string {
+	versionSuffix := p.version()
+	if p.arch() != "" {
+		versionSuffix += "." + p.arch()
+	}
+
+	return p.moduleSuffix + versionSuffix
+}
+
+func (p *baseSnapshotDecorator) version() string {
+	return p.baseProperties.Version
+}
+
+func (p *baseSnapshotDecorator) arch() string {
+	return p.baseProperties.Target_arch
+}
+
+func (p *baseSnapshotDecorator) isSnapshotPrebuilt() bool {
+	return true
+}
+
+// Call this with a module suffix after creating a snapshot module, such as
+// vendorSnapshotSharedSuffix, recoverySnapshotBinarySuffix, etc.
+func (p *baseSnapshotDecorator) init(m *Module, suffix string) {
+	p.moduleSuffix = suffix
+	m.AddProperties(&p.baseProperties)
+	android.AddLoadHook(m, func(ctx android.LoadHookContext) {
+		vendorSnapshotLoadHook(ctx, p)
+	})
+}
+
+// vendorSnapshotLoadHook disables snapshots if it's not BOARD_VNDK_VERSION.
+// As vendor snapshot is only for vendor, such modules won't be used at all.
+func vendorSnapshotLoadHook(ctx android.LoadHookContext, p *baseSnapshotDecorator) {
+	if p.version() != ctx.DeviceConfig().VndkVersion() {
+		ctx.Module().Disable()
+		return
+	}
+}
+
+//
+// Module definitions for snapshots of libraries (shared, static, header).
+//
+// Modules (vendor|recovery)_snapshot_(shared|static|header) are defined here. Shared libraries and
+// static libraries have their prebuilt library files (.so for shared, .a for static) as their src,
+// which can be installed or linked against. Also they export flags needed when linked, such as
+// include directories, c flags, sanitize dependency information, etc.
+//
+// These modules are auto-generated by development/vendor_snapshot/update.py.
+type snapshotLibraryProperties struct {
+	// Prebuilt file for each arch.
+	Src *string `android:"arch_variant"`
+
+	// list of directories that will be added to the include path (using -I).
+	Export_include_dirs []string `android:"arch_variant"`
+
+	// list of directories that will be added to the system path (using -isystem).
+	Export_system_include_dirs []string `android:"arch_variant"`
+
+	// list of flags that will be used for any module that links against this module.
+	Export_flags []string `android:"arch_variant"`
+
+	// Whether this prebuilt needs to depend on sanitize ubsan runtime or not.
+	Sanitize_ubsan_dep *bool `android:"arch_variant"`
+
+	// Whether this prebuilt needs to depend on sanitize minimal runtime or not.
+	Sanitize_minimal_dep *bool `android:"arch_variant"`
+}
+
+type snapshotSanitizer interface {
+	isSanitizerEnabled(t sanitizerType) bool
+	setSanitizerVariation(t sanitizerType, enabled bool)
+}
+
+type snapshotLibraryDecorator struct {
+	baseSnapshotDecorator
+	*libraryDecorator
+	properties          snapshotLibraryProperties
+	sanitizerProperties struct {
+		CfiEnabled bool `blueprint:"mutated"`
+
+		// Library flags for cfi variant.
+		Cfi snapshotLibraryProperties `android:"arch_variant"`
+	}
+	androidMkVendorSuffix bool
+}
+
+func (p *snapshotLibraryDecorator) linkerFlags(ctx ModuleContext, flags Flags) Flags {
+	p.libraryDecorator.libName = strings.TrimSuffix(ctx.ModuleName(), p.NameSuffix())
+	return p.libraryDecorator.linkerFlags(ctx, flags)
+}
+
+func (p *snapshotLibraryDecorator) matchesWithDevice(config android.DeviceConfig) bool {
+	arches := config.Arches()
+	if len(arches) == 0 || arches[0].ArchType.String() != p.arch() {
+		return false
+	}
+	if !p.header() && p.properties.Src == nil {
+		return false
+	}
+	return true
+}
+
+// cc modules' link functions are to link compiled objects into final binaries.
+// As snapshots are prebuilts, this just returns the prebuilt binary after doing things which are
+// done by normal library decorator, e.g. exporting flags.
+func (p *snapshotLibraryDecorator) link(ctx ModuleContext, flags Flags, deps PathDeps, objs Objects) android.Path {
+	m := ctx.Module().(*Module)
+	p.androidMkVendorSuffix = vendorSuffixModules(ctx.Config())[m.BaseModuleName()]
+
+	if p.header() {
+		return p.libraryDecorator.link(ctx, flags, deps, objs)
+	}
+
+	if p.sanitizerProperties.CfiEnabled {
+		p.properties = p.sanitizerProperties.Cfi
+	}
+
+	if !p.matchesWithDevice(ctx.DeviceConfig()) {
+		return nil
+	}
+
+	p.libraryDecorator.reexportDirs(android.PathsForModuleSrc(ctx, p.properties.Export_include_dirs)...)
+	p.libraryDecorator.reexportSystemDirs(android.PathsForModuleSrc(ctx, p.properties.Export_system_include_dirs)...)
+	p.libraryDecorator.reexportFlags(p.properties.Export_flags...)
+
+	in := android.PathForModuleSrc(ctx, *p.properties.Src)
+	p.unstrippedOutputFile = in
+
+	if p.shared() {
+		libName := in.Base()
+		builderFlags := flagsToBuilderFlags(flags)
+
+		// Optimize out relinking against shared libraries whose interface hasn't changed by
+		// depending on a table of contents file instead of the library itself.
+		tocFile := android.PathForModuleOut(ctx, libName+".toc")
+		p.tocFile = android.OptionalPathForPath(tocFile)
+		transformSharedObjectToToc(ctx, in, tocFile, builderFlags)
+
+		ctx.SetProvider(SharedLibraryInfoProvider, SharedLibraryInfo{
+			SharedLibrary:           in,
+			UnstrippedSharedLibrary: p.unstrippedOutputFile,
+
+			TableOfContents: p.tocFile,
+		})
+	}
+
+	if p.static() {
+		depSet := android.NewDepSetBuilder(android.TOPOLOGICAL).Direct(in).Build()
+		ctx.SetProvider(StaticLibraryInfoProvider, StaticLibraryInfo{
+			StaticLibrary: in,
+
+			TransitiveStaticLibrariesForOrdering: depSet,
+		})
+	}
+
+	p.libraryDecorator.flagExporter.setProvider(ctx)
+
+	return in
+}
+
+func (p *snapshotLibraryDecorator) install(ctx ModuleContext, file android.Path) {
+	if p.matchesWithDevice(ctx.DeviceConfig()) && (p.shared() || p.static()) {
+		p.baseInstaller.install(ctx, file)
+	}
+}
+
+func (p *snapshotLibraryDecorator) nativeCoverage() bool {
+	return false
+}
+
+func (p *snapshotLibraryDecorator) isSanitizerEnabled(t sanitizerType) bool {
+	switch t {
+	case cfi:
+		return p.sanitizerProperties.Cfi.Src != nil
+	default:
+		return false
+	}
+}
+
+func (p *snapshotLibraryDecorator) setSanitizerVariation(t sanitizerType, enabled bool) {
+	if !enabled {
+		return
+	}
+	switch t {
+	case cfi:
+		p.sanitizerProperties.CfiEnabled = true
+	default:
+		return
+	}
+}
+
+func snapshotLibraryFactory(suffix string) (*Module, *snapshotLibraryDecorator) {
+	module, library := NewLibrary(android.DeviceSupported)
+
+	module.stl = nil
+	module.sanitize = nil
+	library.disableStripping()
+
+	prebuilt := &snapshotLibraryDecorator{
+		libraryDecorator: library,
+	}
+
+	prebuilt.baseLinker.Properties.No_libcrt = BoolPtr(true)
+	prebuilt.baseLinker.Properties.Nocrt = BoolPtr(true)
+
+	// Prevent default system libs (libc, libm, and libdl) from being linked
+	if prebuilt.baseLinker.Properties.System_shared_libs == nil {
+		prebuilt.baseLinker.Properties.System_shared_libs = []string{}
+	}
+
+	module.compiler = nil
+	module.linker = prebuilt
+	module.installer = prebuilt
+
+	prebuilt.init(module, suffix)
+	module.AddProperties(
+		&prebuilt.properties,
+		&prebuilt.sanitizerProperties,
+	)
+
+	return module, prebuilt
+}
+
+// vendor_snapshot_shared is a special prebuilt shared library which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of vendor snapshot, vendor_snapshot_shared
+// overrides the vendor variant of the cc shared library with the same name, if BOARD_VNDK_VERSION
+// is set.
+func VendorSnapshotSharedFactory() android.Module {
+	module, prebuilt := snapshotLibraryFactory(vendorSnapshotSharedSuffix)
+	prebuilt.libraryDecorator.BuildOnlyShared()
+	return module.Init()
+}
+
+// recovery_snapshot_shared is a special prebuilt shared library which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of recovery snapshot, recovery_snapshot_shared
+// overrides the recovery variant of the cc shared library with the same name, if BOARD_VNDK_VERSION
+// is set.
+func RecoverySnapshotSharedFactory() android.Module {
+	module, prebuilt := snapshotLibraryFactory(recoverySnapshotSharedSuffix)
+	prebuilt.libraryDecorator.BuildOnlyShared()
+	return module.Init()
+}
+
+// vendor_snapshot_static is a special prebuilt static library which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of vendor snapshot, vendor_snapshot_static
+// overrides the vendor variant of the cc static library with the same name, if BOARD_VNDK_VERSION
+// is set.
+func VendorSnapshotStaticFactory() android.Module {
+	module, prebuilt := snapshotLibraryFactory(vendorSnapshotStaticSuffix)
+	prebuilt.libraryDecorator.BuildOnlyStatic()
+	return module.Init()
+}
+
+// recovery_snapshot_static is a special prebuilt static library which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of recovery snapshot, recovery_snapshot_static
+// overrides the recovery variant of the cc static library with the same name, if BOARD_VNDK_VERSION
+// is set.
+func RecoverySnapshotStaticFactory() android.Module {
+	module, prebuilt := snapshotLibraryFactory(recoverySnapshotStaticSuffix)
+	prebuilt.libraryDecorator.BuildOnlyStatic()
+	return module.Init()
+}
+
+// vendor_snapshot_header is a special header library which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of vendor snapshot, vendor_snapshot_header
+// overrides the vendor variant of the cc header library with the same name, if BOARD_VNDK_VERSION
+// is set.
+func VendorSnapshotHeaderFactory() android.Module {
+	module, prebuilt := snapshotLibraryFactory(vendorSnapshotHeaderSuffix)
+	prebuilt.libraryDecorator.HeaderOnly()
+	return module.Init()
+}
+
+// recovery_snapshot_header is a special header library which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of recovery snapshot, recovery_snapshot_header
+// overrides the recovery variant of the cc header library with the same name, if BOARD_VNDK_VERSION
+// is set.
+func RecoverySnapshotHeaderFactory() android.Module {
+	module, prebuilt := snapshotLibraryFactory(recoverySnapshotHeaderSuffix)
+	prebuilt.libraryDecorator.HeaderOnly()
+	return module.Init()
+}
+
+var _ snapshotSanitizer = (*snapshotLibraryDecorator)(nil)
+
+//
+// Module definitions for snapshots of executable binaries.
+//
+// Modules (vendor|recovery)_snapshot_binary are defined here. They have their prebuilt executable
+// binaries (e.g. toybox, sh) as their src, which can be installed.
+//
+// These modules are auto-generated by development/vendor_snapshot/update.py.
+type snapshotBinaryProperties struct {
+	// Prebuilt file for each arch.
+	Src *string `android:"arch_variant"`
+}
+
+type snapshotBinaryDecorator struct {
+	baseSnapshotDecorator
+	*binaryDecorator
+	properties            snapshotBinaryProperties
+	androidMkVendorSuffix bool
+}
+
+func (p *snapshotBinaryDecorator) matchesWithDevice(config android.DeviceConfig) bool {
+	if config.DeviceArch() != p.arch() {
+		return false
+	}
+	if p.properties.Src == nil {
+		return false
+	}
+	return true
+}
+
+// cc modules' link functions are to link compiled objects into final binaries.
+// As snapshots are prebuilts, this just returns the prebuilt binary
+func (p *snapshotBinaryDecorator) link(ctx ModuleContext, flags Flags, deps PathDeps, objs Objects) android.Path {
+	if !p.matchesWithDevice(ctx.DeviceConfig()) {
+		return nil
+	}
+
+	in := android.PathForModuleSrc(ctx, *p.properties.Src)
+	p.unstrippedOutputFile = in
+	binName := in.Base()
+
+	m := ctx.Module().(*Module)
+	p.androidMkVendorSuffix = vendorSuffixModules(ctx.Config())[m.BaseModuleName()]
+
+	// use cpExecutable to make it executable
+	outputFile := android.PathForModuleOut(ctx, binName)
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        android.CpExecutable,
+		Description: "prebuilt",
+		Output:      outputFile,
+		Input:       in,
+	})
+
+	return outputFile
+}
+
+func (p *snapshotBinaryDecorator) nativeCoverage() bool {
+	return false
+}
+
+// vendor_snapshot_binary is a special prebuilt executable binary which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of vendor snapshot, vendor_snapshot_binary
+// overrides the vendor variant of the cc binary with the same name, if BOARD_VNDK_VERSION is set.
+func VendorSnapshotBinaryFactory() android.Module {
+	return snapshotBinaryFactory(vendorSnapshotBinarySuffix)
+}
+
+// recovery_snapshot_binary is a special prebuilt executable binary which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of recovery snapshot, recovery_snapshot_binary
+// overrides the recovery variant of the cc binary with the same name, if BOARD_VNDK_VERSION is set.
+func RecoverySnapshotBinaryFactory() android.Module {
+	return snapshotBinaryFactory(recoverySnapshotBinarySuffix)
+}
+
+func snapshotBinaryFactory(suffix string) android.Module {
+	module, binary := NewBinary(android.DeviceSupported)
+	binary.baseLinker.Properties.No_libcrt = BoolPtr(true)
+	binary.baseLinker.Properties.Nocrt = BoolPtr(true)
+
+	// Prevent default system libs (libc, libm, and libdl) from being linked
+	if binary.baseLinker.Properties.System_shared_libs == nil {
+		binary.baseLinker.Properties.System_shared_libs = []string{}
+	}
+
+	prebuilt := &snapshotBinaryDecorator{
+		binaryDecorator: binary,
+	}
+
+	module.compiler = nil
+	module.sanitize = nil
+	module.stl = nil
+	module.linker = prebuilt
+
+	prebuilt.init(module, suffix)
+	module.AddProperties(&prebuilt.properties)
+	return module.Init()
+}
+
+//
+// Module definitions for snapshots of object files (*.o).
+//
+// Modules (vendor|recovery)_snapshot_object are defined here. They have their prebuilt object
+// files (*.o) as their src.
+//
+// These modules are auto-generated by development/vendor_snapshot/update.py.
+type vendorSnapshotObjectProperties struct {
+	// Prebuilt file for each arch.
+	Src *string `android:"arch_variant"`
+}
+
+type snapshotObjectLinker struct {
+	baseSnapshotDecorator
+	objectLinker
+	properties            vendorSnapshotObjectProperties
+	androidMkVendorSuffix bool
+}
+
+func (p *snapshotObjectLinker) matchesWithDevice(config android.DeviceConfig) bool {
+	if config.DeviceArch() != p.arch() {
+		return false
+	}
+	if p.properties.Src == nil {
+		return false
+	}
+	return true
+}
+
+// cc modules' link functions are to link compiled objects into final binaries.
+// As snapshots are prebuilts, this just returns the prebuilt binary
+func (p *snapshotObjectLinker) link(ctx ModuleContext, flags Flags, deps PathDeps, objs Objects) android.Path {
+	if !p.matchesWithDevice(ctx.DeviceConfig()) {
+		return nil
+	}
+
+	m := ctx.Module().(*Module)
+	p.androidMkVendorSuffix = vendorSuffixModules(ctx.Config())[m.BaseModuleName()]
+
+	return android.PathForModuleSrc(ctx, *p.properties.Src)
+}
+
+func (p *snapshotObjectLinker) nativeCoverage() bool {
+	return false
+}
+
+// vendor_snapshot_object is a special prebuilt compiled object file which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of vendor snapshot, vendor_snapshot_object
+// overrides the vendor variant of the cc object with the same name, if BOARD_VNDK_VERSION is set.
+func VendorSnapshotObjectFactory() android.Module {
+	module := newObject()
+
+	prebuilt := &snapshotObjectLinker{
+		objectLinker: objectLinker{
+			baseLinker: NewBaseLinker(nil),
+		},
+	}
+	module.linker = prebuilt
+
+	prebuilt.init(module, vendorSnapshotObjectSuffix)
+	module.AddProperties(&prebuilt.properties)
+	return module.Init()
+}
+
+// recovery_snapshot_object is a special prebuilt compiled object file which is auto-generated by
+// development/vendor_snapshot/update.py. As a part of recovery snapshot, recovery_snapshot_object
+// overrides the recovery variant of the cc object with the same name, if BOARD_VNDK_VERSION is set.
+func RecoverySnapshotObjectFactory() android.Module {
+	module := newObject()
+
+	prebuilt := &snapshotObjectLinker{
+		objectLinker: objectLinker{
+			baseLinker: NewBaseLinker(nil),
+		},
+	}
+	module.linker = prebuilt
+
+	prebuilt.init(module, recoverySnapshotObjectSuffix)
+	module.AddProperties(&prebuilt.properties)
+	return module.Init()
+}
+
+type snapshotInterface interface {
+	matchesWithDevice(config android.DeviceConfig) bool
+}
+
+var _ snapshotInterface = (*vndkPrebuiltLibraryDecorator)(nil)
+var _ snapshotInterface = (*snapshotLibraryDecorator)(nil)
+var _ snapshotInterface = (*snapshotBinaryDecorator)(nil)
+var _ snapshotInterface = (*snapshotObjectLinker)(nil)
+
+//
+// Mutators that helps vendor snapshot modules override source modules.
+//
+
+// VendorSnapshotMutator gathers all snapshots for vendor, and disable all snapshots which don't
+// match with device, e.g.
+//   - snapshot version is different with BOARD_VNDK_VERSION
+//   - snapshot arch is different with device's arch (e.g. arm vs x86)
+//
+// This also handles vndk_prebuilt_shared, except for they won't be disabled in any cases, given
+// that any versions of VNDK might be packed into vndk APEX.
+//
+// TODO(b/145966707): remove mutator and utilize android.Prebuilt to override source modules
+func VendorSnapshotMutator(ctx android.BottomUpMutatorContext) {
+	vndkVersion := ctx.DeviceConfig().VndkVersion()
+	// don't need snapshot if current
+	if vndkVersion == "current" || vndkVersion == "" {
+		return
+	}
+
+	module, ok := ctx.Module().(*Module)
+	if !ok || !module.Enabled() || module.VndkVersion() != vndkVersion {
+		return
+	}
+
+	if !module.isSnapshotPrebuilt() {
+		return
+	}
+
+	// isSnapshotPrebuilt ensures snapshotInterface
+	if !module.linker.(snapshotInterface).matchesWithDevice(ctx.DeviceConfig()) {
+		// Disable unnecessary snapshot module, but do not disable
+		// vndk_prebuilt_shared because they might be packed into vndk APEX
+		if !module.IsVndk() {
+			module.Disable()
+		}
+		return
+	}
+
+	var snapshotMap *snapshotMap
+
+	if lib, ok := module.linker.(libraryInterface); ok {
+		if lib.static() {
+			snapshotMap = vendorSnapshotStaticLibs(ctx.Config())
+		} else if lib.shared() {
+			snapshotMap = vendorSnapshotSharedLibs(ctx.Config())
+		} else {
+			// header
+			snapshotMap = vendorSnapshotHeaderLibs(ctx.Config())
+		}
+	} else if _, ok := module.linker.(*snapshotBinaryDecorator); ok {
+		snapshotMap = vendorSnapshotBinaries(ctx.Config())
+	} else if _, ok := module.linker.(*snapshotObjectLinker); ok {
+		snapshotMap = vendorSnapshotObjects(ctx.Config())
+	} else {
+		return
+	}
+
+	vendorSnapshotsLock.Lock()
+	defer vendorSnapshotsLock.Unlock()
+	snapshotMap.add(module.BaseModuleName(), ctx.Arch().ArchType, ctx.ModuleName())
+}
+
+// VendorSnapshotSourceMutator disables source modules which have corresponding snapshots.
+func VendorSnapshotSourceMutator(ctx android.BottomUpMutatorContext) {
+	if !ctx.Device() {
+		return
+	}
+
+	vndkVersion := ctx.DeviceConfig().VndkVersion()
+	// don't need snapshot if current
+	if vndkVersion == "current" || vndkVersion == "" {
+		return
+	}
+
+	module, ok := ctx.Module().(*Module)
+	if !ok {
+		return
+	}
+
+	// vendor suffix should be added to snapshots if the source module isn't vendor: true.
+	if !module.SocSpecific() {
+		// But we can't just check SocSpecific() since we already passed the image mutator.
+		// Check ramdisk and recovery to see if we are real "vendor: true" module.
+		ramdisk_available := module.InRamdisk() && !module.OnlyInRamdisk()
+		vendor_ramdisk_available := module.InVendorRamdisk() && !module.OnlyInVendorRamdisk()
+		recovery_available := module.InRecovery() && !module.OnlyInRecovery()
+
+		if !ramdisk_available && !recovery_available && !vendor_ramdisk_available {
+			vendorSnapshotsLock.Lock()
+			defer vendorSnapshotsLock.Unlock()
+
+			vendorSuffixModules(ctx.Config())[ctx.ModuleName()] = true
+		}
+	}
+
+	if module.isSnapshotPrebuilt() || module.VndkVersion() != ctx.DeviceConfig().VndkVersion() {
+		// only non-snapshot modules with BOARD_VNDK_VERSION
+		return
+	}
+
+	// .. and also filter out llndk library
+	if module.isLlndk(ctx.Config()) {
+		return
+	}
+
+	var snapshotMap *snapshotMap
+
+	if lib, ok := module.linker.(libraryInterface); ok {
+		if lib.static() {
+			snapshotMap = vendorSnapshotStaticLibs(ctx.Config())
+		} else if lib.shared() {
+			snapshotMap = vendorSnapshotSharedLibs(ctx.Config())
+		} else {
+			// header
+			snapshotMap = vendorSnapshotHeaderLibs(ctx.Config())
+		}
+	} else if module.binary() {
+		snapshotMap = vendorSnapshotBinaries(ctx.Config())
+	} else if module.object() {
+		snapshotMap = vendorSnapshotObjects(ctx.Config())
+	} else {
+		return
+	}
+
+	if _, ok := snapshotMap.get(ctx.ModuleName(), ctx.Arch().ArchType); !ok {
+		// Corresponding snapshot doesn't exist
+		return
+	}
+
+	// Disables source modules if corresponding snapshot exists.
+	if lib, ok := module.linker.(libraryInterface); ok && lib.buildStatic() && lib.buildShared() {
+		// But do not disable because the shared variant depends on the static variant.
+		module.SkipInstall()
+		module.Properties.HideFromMake = true
+	} else {
+		module.Disable()
+	}
+}