diff --git a/Android.bp b/Android.bp
index 9b55c8c..f425c3f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -186,14 +186,15 @@
         "cc/rs.go",
         "cc/sanitize.go",
         "cc/sabi.go",
+        "cc/snapshot_utils.go",
         "cc/stl.go",
         "cc/strip.go",
         "cc/sysprop.go",
         "cc/tidy.go",
         "cc/util.go",
+        "cc/vendor_snapshot.go",
         "cc/vndk.go",
         "cc/vndk_prebuilt.go",
-        "cc/xom.go",
 
         "cc/cflag_artifacts.go",
         "cc/cmakelists.go",
diff --git a/android/apex.go b/android/apex.go
index 9195388..43a42df 100644
--- a/android/apex.go
+++ b/android/apex.go
@@ -19,6 +19,14 @@
 	"sync"
 )
 
+type ApexInfo struct {
+	// Name of the apex variant that this module is mutated into
+	ApexName string
+
+	// Whether this apex variant needs to target Android 10
+	LegacyAndroid10Support bool
+}
+
 // ApexModule is the interface that a module type is expected to implement if
 // the module has to be built differently depending on whether the module
 // is destined for an apex or not (installed to one of the regular partitions).
@@ -38,9 +46,12 @@
 	Module
 	apexModuleBase() *ApexModuleBase
 
-	// Marks that this module should be built for the APEX of the specified name.
+	// Marks that this module should be built for the specified APEXes.
 	// Call this before apex.apexMutator is run.
-	BuildForApex(apexName string)
+	BuildForApexes(apexes []ApexInfo)
+
+	// Returns the APEXes that this module will be built for
+	ApexVariations() []ApexInfo
 
 	// Returns the name of APEX that this module will be built for. Empty string
 	// is returned when 'IsForPlatform() == true'. Note that a module can be
@@ -66,13 +77,9 @@
 	IsInstallableToApex() bool
 
 	// Mutate this module into one or more variants each of which is built
-	// for an APEX marked via BuildForApex().
+	// for an APEX marked via BuildForApexes().
 	CreateApexVariations(mctx BottomUpMutatorContext) []Module
 
-	// Sets the name of the apex variant of this module. Called inside
-	// CreateApexVariations.
-	setApexName(apexName string)
-
 	// Tests if this module is available for the specified APEX or ":platform"
 	AvailableFor(what string) bool
 
@@ -88,12 +95,10 @@
 	//
 	// "//apex_available:anyapex" is a pseudo APEX name that matches to any APEX.
 	// "//apex_available:platform" refers to non-APEX partitions like "system.img".
-	// Default is ["//apex_available:platform", "//apex_available:anyapex"].
-	// TODO(b/128708192) change the default to ["//apex_available:platform"]
+	// Default is ["//apex_available:platform"].
 	Apex_available []string
 
-	// Name of the apex variant that this module is mutated into
-	ApexName string `blueprint:"mutated"`
+	Info ApexInfo `blueprint:"mutated"`
 }
 
 // Provides default implementation for the ApexModule interface. APEX-aware
@@ -104,31 +109,37 @@
 	canHaveApexVariants bool
 
 	apexVariationsLock sync.Mutex // protects apexVariations during parallel apexDepsMutator
-	apexVariations     []string
+	apexVariations     []ApexInfo
 }
 
 func (m *ApexModuleBase) apexModuleBase() *ApexModuleBase {
 	return m
 }
 
-func (m *ApexModuleBase) BuildForApex(apexName string) {
+func (m *ApexModuleBase) BuildForApexes(apexes []ApexInfo) {
 	m.apexVariationsLock.Lock()
 	defer m.apexVariationsLock.Unlock()
-	if !InList(apexName, m.apexVariations) {
-		m.apexVariations = append(m.apexVariations, apexName)
+nextApex:
+	for _, apex := range apexes {
+		for _, v := range m.apexVariations {
+			if v.ApexName == apex.ApexName {
+				continue nextApex
+			}
+		}
+		m.apexVariations = append(m.apexVariations, apex)
 	}
 }
 
+func (m *ApexModuleBase) ApexVariations() []ApexInfo {
+	return m.apexVariations
+}
+
 func (m *ApexModuleBase) ApexName() string {
-	return m.ApexProperties.ApexName
+	return m.ApexProperties.Info.ApexName
 }
 
 func (m *ApexModuleBase) IsForPlatform() bool {
-	return m.ApexProperties.ApexName == ""
-}
-
-func (m *ApexModuleBase) setApexName(apexName string) {
-	m.ApexProperties.ApexName = apexName
+	return m.ApexProperties.Info.ApexName == ""
 }
 
 func (m *ApexModuleBase) CanHaveApexVariants() bool {
@@ -177,25 +188,35 @@
 	}
 }
 
+type byApexName []ApexInfo
+
+func (a byApexName) Len() int           { return len(a) }
+func (a byApexName) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+func (a byApexName) Less(i, j int) bool { return a[i].ApexName < a[j].ApexName }
+
 func (m *ApexModuleBase) CreateApexVariations(mctx BottomUpMutatorContext) []Module {
 	if len(m.apexVariations) > 0 {
 		m.checkApexAvailableProperty(mctx)
 
-		sort.Strings(m.apexVariations)
+		sort.Sort(byApexName(m.apexVariations))
 		variations := []string{}
 		variations = append(variations, "") // Original variation for platform
-		variations = append(variations, m.apexVariations...)
+		for _, apex := range m.apexVariations {
+			variations = append(variations, apex.ApexName)
+		}
 
 		defaultVariation := ""
 		mctx.SetDefaultDependencyVariation(&defaultVariation)
 
 		modules := mctx.CreateVariations(variations...)
-		for i, m := range modules {
+		for i, mod := range modules {
 			platformVariation := i == 0
-			if platformVariation && !mctx.Host() && !m.(ApexModule).AvailableFor(AvailableToPlatform) {
-				m.SkipInstall()
+			if platformVariation && !mctx.Host() && !mod.(ApexModule).AvailableFor(AvailableToPlatform) {
+				mod.SkipInstall()
 			}
-			m.(ApexModule).setApexName(variations[i])
+			if !platformVariation {
+				mod.(ApexModule).apexModuleBase().ApexProperties.Info = m.apexVariations[i-1]
+			}
 		}
 		return modules
 	}
@@ -219,18 +240,20 @@
 }
 
 // Update the map to mark that a module named moduleName is directly or indirectly
-// depended on by an APEX named apexName. Directly depending means that a module
+// depended on by the specified APEXes. Directly depending means that a module
 // is explicitly listed in the build definition of the APEX via properties like
 // native_shared_libs, java_libs, etc.
-func UpdateApexDependency(apexName string, moduleName string, directDep bool) {
+func UpdateApexDependency(apexes []ApexInfo, moduleName string, directDep bool) {
 	apexNamesMapMutex.Lock()
 	defer apexNamesMapMutex.Unlock()
-	apexNames, ok := apexNamesMap()[moduleName]
-	if !ok {
-		apexNames = make(map[string]bool)
-		apexNamesMap()[moduleName] = apexNames
+	for _, apex := range apexes {
+		apexesForModule, ok := apexNamesMap()[moduleName]
+		if !ok {
+			apexesForModule = make(map[string]bool)
+			apexNamesMap()[moduleName] = apexesForModule
+		}
+		apexesForModule[apex.ApexName] = apexesForModule[apex.ApexName] || directDep
 	}
-	apexNames[apexName] = apexNames[apexName] || directDep
 }
 
 // TODO(b/146393795): remove this when b/146393795 is fixed
diff --git a/android/arch.go b/android/arch.go
index 3657e6d..73a490d 100644
--- a/android/arch.go
+++ b/android/arch.go
@@ -765,7 +765,7 @@
 	}
 
 	if len(moduleOSList) == 0 {
-		base.commonProperties.Enabled = boolPtr(false)
+		base.Disable()
 		return
 	}
 
@@ -869,7 +869,7 @@
 	}
 
 	if len(targets) == 0 {
-		base.commonProperties.Enabled = boolPtr(false)
+		base.Disable()
 		return
 	}
 
@@ -1521,12 +1521,7 @@
 
 // hasArmAbi returns true if arch has at least one arm ABI
 func hasArmAbi(arch Arch) bool {
-	for _, abi := range arch.Abi {
-		if strings.HasPrefix(abi, "arm") {
-			return true
-		}
-	}
-	return false
+	return PrefixInList(arch.Abi, "arm")
 }
 
 // hasArmArch returns true if targets has at least non-native_bridge arm Android arch
diff --git a/android/config.go b/android/config.go
index d0ac4c3..1fe6f05 100644
--- a/android/config.go
+++ b/android/config.go
@@ -790,14 +790,6 @@
 	return Bool(c.productVariables.DisableScudo)
 }
 
-func (c *config) EnableXOM() bool {
-	if c.productVariables.EnableXOM == nil {
-		return true
-	} else {
-		return Bool(c.productVariables.EnableXOM)
-	}
-}
-
 func (c *config) Android64() bool {
 	for _, t := range c.Targets[Android] {
 		if t.Arch.ArchType.Multilib == "lib64" {
@@ -898,11 +890,7 @@
 func (c *config) EnforceRROExcludedOverlay(path string) bool {
 	excluded := c.productVariables.EnforceRROExcludedOverlays
 	if excluded != nil {
-		for _, exclude := range excluded {
-			if strings.HasPrefix(path, exclude) {
-				return true
-			}
-		}
+		return HasAnyPrefix(path, excluded)
 	}
 	return false
 }
@@ -923,8 +911,23 @@
 	return c.productVariables.ModulesLoadedByPrivilegedModules
 }
 
+// Expected format for apexJarValue = <apex name>:<jar name>
+func SplitApexJarPair(apexJarValue string) (string, string) {
+	var apexJarPair []string = strings.SplitN(apexJarValue, ":", 2)
+	if apexJarPair == nil || len(apexJarPair) != 2 {
+		panic(fmt.Errorf("malformed apexJarValue: %q, expected format: <apex>:<jar>",
+			apexJarValue))
+	}
+	return apexJarPair[0], apexJarPair[1]
+}
+
 func (c *config) BootJars() []string {
-	return c.productVariables.BootJars
+	jars := c.productVariables.BootJars
+	for _, p := range c.productVariables.UpdatableBootJars {
+		_, jar := SplitApexJarPair(p)
+		jars = append(jars, jar)
+	}
+	return jars
 }
 
 func (c *config) DexpreoptGlobalConfig(ctx PathContext) ([]byte, error) {
@@ -1043,12 +1046,12 @@
 func (c *deviceConfig) CoverageEnabledForPath(path string) bool {
 	coverage := false
 	if c.config.productVariables.CoveragePaths != nil {
-		if InList("*", c.config.productVariables.CoveragePaths) || PrefixInList(path, c.config.productVariables.CoveragePaths) {
+		if InList("*", c.config.productVariables.CoveragePaths) || HasAnyPrefix(path, c.config.productVariables.CoveragePaths) {
 			coverage = true
 		}
 	}
 	if coverage && c.config.productVariables.CoverageExcludePaths != nil {
-		if PrefixInList(path, c.config.productVariables.CoverageExcludePaths) {
+		if HasAnyPrefix(path, c.config.productVariables.CoverageExcludePaths) {
 			coverage = false
 		}
 	}
@@ -1121,28 +1124,21 @@
 	if c.productVariables.IntegerOverflowExcludePaths == nil {
 		return false
 	}
-	return PrefixInList(path, c.productVariables.IntegerOverflowExcludePaths)
+	return HasAnyPrefix(path, c.productVariables.IntegerOverflowExcludePaths)
 }
 
 func (c *config) CFIDisabledForPath(path string) bool {
 	if c.productVariables.CFIExcludePaths == nil {
 		return false
 	}
-	return PrefixInList(path, c.productVariables.CFIExcludePaths)
+	return HasAnyPrefix(path, c.productVariables.CFIExcludePaths)
 }
 
 func (c *config) CFIEnabledForPath(path string) bool {
 	if c.productVariables.CFIIncludePaths == nil {
 		return false
 	}
-	return PrefixInList(path, c.productVariables.CFIIncludePaths)
-}
-
-func (c *config) XOMDisabledForPath(path string) bool {
-	if c.productVariables.XOMExcludePaths == nil {
-		return false
-	}
-	return PrefixInList(path, c.productVariables.XOMExcludePaths)
+	return HasAnyPrefix(path, c.productVariables.CFIIncludePaths)
 }
 
 func (c *config) VendorConfig(name string) VendorConfig {
diff --git a/android/module.go b/android/module.go
index 0a8737b..fd3fec3 100644
--- a/android/module.go
+++ b/android/module.go
@@ -204,6 +204,7 @@
 	DepsMutator(BottomUpMutatorContext)
 
 	base() *ModuleBase
+	Disable()
 	Enabled() bool
 	Target() Target
 	InstallInData() bool
@@ -215,6 +216,8 @@
 	InstallBypassMake() bool
 	SkipInstall()
 	ExportedToMake() bool
+	InitRc() Paths
+	VintfFragments() Paths
 	NoticeFile() OptionalPath
 
 	AddProperties(props ...interface{})
@@ -291,6 +294,12 @@
 
 type commonProperties struct {
 	// emit build rules for this module
+	//
+	// Disabling a module should only be done for those modules that cannot be built
+	// in the current environment. Modules that can build in the current environment
+	// but are not usually required (e.g. superceded by a prebuilt) should not be
+	// disabled as that will prevent them from being built by the checkbuild target
+	// and so prevent early detection of changes that have broken those modules.
 	Enabled *bool `android:"arch_variant"`
 
 	// Controls the visibility of this module to other modules. Allowable values are one or more of
@@ -653,6 +662,9 @@
 	ruleParams  map[blueprint.Rule]blueprint.RuleParams
 	variables   map[string]string
 
+	initRcPaths         Paths
+	vintfFragmentsPaths Paths
+
 	prefer32 func(ctx BaseModuleContext, base *ModuleBase, class OsClass) bool
 }
 
@@ -825,6 +837,10 @@
 	return *m.commonProperties.Enabled
 }
 
+func (m *ModuleBase) Disable() {
+	m.commonProperties.Enabled = proptools.BoolPtr(false)
+}
+
 func (m *ModuleBase) SkipInstall() {
 	m.commonProperties.SkipInstall = true
 }
@@ -923,6 +939,14 @@
 	return m.base().commonProperties.Target_required
 }
 
+func (m *ModuleBase) InitRc() Paths {
+	return append(Paths{}, m.initRcPaths...)
+}
+
+func (m *ModuleBase) VintfFragments() Paths {
+	return append(Paths{}, m.vintfFragmentsPaths...)
+}
+
 func (m *ModuleBase) generateModuleTarget(ctx ModuleContext) {
 	allInstalledFiles := Paths{}
 	allCheckbuildFiles := Paths{}
@@ -1088,6 +1112,9 @@
 	if !ctx.PrimaryArch() {
 		suffix = append(suffix, ctx.Arch().ArchType.String())
 	}
+	if apex, ok := m.module.(ApexModule); ok && !apex.IsForPlatform() {
+		suffix = append(suffix, apex.ApexName())
+	}
 
 	ctx.Variable(pctx, "moduleDesc", desc)
 
@@ -1139,6 +1166,8 @@
 
 		m.installFiles = append(m.installFiles, ctx.installFiles...)
 		m.checkbuildFiles = append(m.checkbuildFiles, ctx.checkbuildFiles...)
+		m.initRcPaths = PathsForModuleSrc(ctx, m.commonProperties.Init_rc)
+		m.vintfFragmentsPaths = PathsForModuleSrc(ctx, m.commonProperties.Vintf_fragments)
 	} else if ctx.Config().AllowMissingDependencies() {
 		// If the module is not enabled it will not create any build rules, nothing will call
 		// ctx.GetMissingDependencies(), and blueprint will consider the missing dependencies to be unhandled
diff --git a/android/neverallow.go b/android/neverallow.go
index cef73fb..0cb2029 100644
--- a/android/neverallow.go
+++ b/android/neverallow.go
@@ -111,7 +111,9 @@
 
 		// TODO(b/67974785): always enforce the manifest
 		NeverAllow().
-			Without("name", "libhidltransport-impl-internal").
+			Without("name", "libhidlbase-combined-impl").
+			Without("name", "libhidlbase").
+			Without("name", "libhidlbase_pgo").
 			With("product_variables.enforce_vintf_manifest.cflags", "*").
 			Because("manifest enforcement should be independent of ."),
 
@@ -405,8 +407,8 @@
 }
 
 func (r *rule) appliesToPath(dir string) bool {
-	includePath := len(r.paths) == 0 || hasAnyPrefix(dir, r.paths)
-	excludePath := hasAnyPrefix(dir, r.unlessPaths)
+	includePath := len(r.paths) == 0 || HasAnyPrefix(dir, r.paths)
+	excludePath := HasAnyPrefix(dir, r.unlessPaths)
 	return includePath && !excludePath
 }
 
@@ -472,15 +474,6 @@
 	return names
 }
 
-func hasAnyPrefix(s string, prefixes []string) bool {
-	for _, prefix := range prefixes {
-		if strings.HasPrefix(s, prefix) {
-			return true
-		}
-	}
-	return false
-}
-
 func hasAnyProperty(properties []interface{}, props []ruleProperty) bool {
 	for _, v := range props {
 		if hasProperty(properties, v) {
diff --git a/android/util.go b/android/util.go
index e985fc1..ade851e 100644
--- a/android/util.go
+++ b/android/util.go
@@ -122,7 +122,7 @@
 }
 
 // Returns true if the given string s is prefixed with any string in the given prefix list.
-func PrefixInList(s string, prefixList []string) bool {
+func HasAnyPrefix(s string, prefixList []string) bool {
 	for _, prefix := range prefixList {
 		if strings.HasPrefix(s, prefix) {
 			return true
@@ -132,7 +132,7 @@
 }
 
 // Returns true if any string in the given list has the given prefix.
-func PrefixedStringInList(list []string, prefix string) bool {
+func PrefixInList(list []string, prefix string) bool {
 	for _, s := range list {
 		if strings.HasPrefix(s, prefix) {
 			return true
diff --git a/android/util_test.go b/android/util_test.go
index 90fefee..1f9ca36 100644
--- a/android/util_test.go
+++ b/android/util_test.go
@@ -252,7 +252,7 @@
 
 	for _, testCase := range testcases {
 		t.Run(testCase.str, func(t *testing.T) {
-			out := PrefixInList(testCase.str, prefixes)
+			out := HasAnyPrefix(testCase.str, prefixes)
 			if out != testCase.expected {
 				t.Errorf("incorrect output:")
 				t.Errorf("       str: %#v", testCase.str)
diff --git a/android/variable.go b/android/variable.go
index 58e5940..9cbe624 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -230,7 +230,8 @@
 	UncompressPrivAppDex             *bool    `json:",omitempty"`
 	ModulesLoadedByPrivilegedModules []string `json:",omitempty"`
 
-	BootJars []string `json:",omitempty"`
+	BootJars          []string `json:",omitempty"`
+	UpdatableBootJars []string `json:",omitempty"`
 
 	IntegerOverflowExcludePaths []string `json:",omitempty"`
 
@@ -240,9 +241,6 @@
 
 	DisableScudo *bool `json:",omitempty"`
 
-	EnableXOM       *bool    `json:",omitempty"`
-	XOMExcludePaths []string `json:",omitempty"`
-
 	Experimental_mte *bool `json:",omitempty"`
 
 	VendorPath    *string `json:",omitempty"`
diff --git a/apex/androidmk.go b/apex/androidmk.go
index 714045f..0abec0d 100644
--- a/apex/androidmk.go
+++ b/apex/androidmk.go
@@ -217,6 +217,12 @@
 			}
 			fmt.Fprintln(w, "include $(BUILD_PREBUILT)")
 		}
+
+		// m <module_name> will build <module_name>.<apex_name> as well.
+		if fi.moduleName != moduleName && a.primaryApexType {
+			fmt.Fprintln(w, ".PHONY: "+fi.moduleName)
+			fmt.Fprintln(w, fi.moduleName+": "+moduleName)
+		}
 	}
 	return moduleNames
 }
diff --git a/apex/apex.go b/apex/apex.go
index eafc186..002bf5b 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -94,7 +94,6 @@
 		"libcutils",
 		"libcutils_headers",
 		"libdiagnose_usb",
-		"liblog",
 		"liblog_headers",
 		"libmdnssd",
 		"libminijail",
@@ -170,7 +169,6 @@
 		"libicuuc_headers",
 		"libicuuc_stubdata",
 		"libjdwp_headers",
-		"liblog",
 		"liblog_headers",
 		"liblz4",
 		"liblzma",
@@ -234,7 +232,6 @@
 		"libbase",
 		"libbase_headers",
 		"libbinder_headers",
-		"libbinderthreadstate",
 		"libbluetooth",
 		"libbluetooth-types",
 		"libbluetooth-types-header",
@@ -286,7 +283,6 @@
 		"libsystem_headers",
 		"libtinyxml2",
 		"libudrv-uipc",
-		"libutils",
 		"libutils_headers",
 		"libz",
 		"media_plugin_headers",
@@ -351,7 +347,6 @@
 		"libbacktrace_headers",
 		"libbase",
 		"libbase_headers",
-		"libbinderthreadstate",
 		"libbuildversion",
 		"libc++",
 		"libcrypto",
@@ -379,7 +374,6 @@
 		"libtextclassifier_hash_headers",
 		"libtextclassifier_hash_static",
 		"libtflite_kernel_utils",
-		"libutils",
 		"libutils_headers",
 		"philox_random",
 		"philox_random_headers",
@@ -441,7 +435,6 @@
 		"libbase",
 		"libbase_headers",
 		"libbinder_headers",
-		"libbinderthreadstate",
 		"libbluetooth-types-header",
 		"libbufferhub",
 		"libbufferhub_headers",
@@ -525,7 +518,6 @@
 		"libui",
 		"libui_headers",
 		"libunwindstack",
-		"libutils",
 		"libutils_headers",
 		"libvibrator",
 		"libvorbisidec",
@@ -587,7 +579,6 @@
 		"libbase",
 		"libbase_headers",
 		"libbinder_headers",
-		"libbinderthreadstate",
 		"libbluetooth-types-header",
 		"libbufferhub_headers",
 		"libc++",
@@ -697,7 +688,6 @@
 		"libui",
 		"libui_headers",
 		"libunwindstack",
-		"libutils",
 		"libutils_headers",
 		"libvorbisidec",
 		"libvpx",
@@ -795,7 +785,6 @@
 		"libjemalloc5",
 		"liblinker_main",
 		"liblinker_malloc",
-		"liblog",
 		"liblog_headers",
 		"liblz4",
 		"liblzma",
@@ -828,7 +817,6 @@
 		"libcutils_headers",
 		"libgtest_prod",
 		"libjsoncpp",
-		"liblog",
 		"liblog_headers",
 		"libnativehelper_header_only",
 		"libnetd_client_headers",
@@ -844,7 +832,6 @@
 		"libstatssocket_headers",
 		"libsystem_headers",
 		"libsysutils",
-		"libutils",
 		"libutils_headers",
 		"netd_event_listener_interface-ndk_platform",
 		"server_configurable_flags",
@@ -861,7 +848,6 @@
 		"fmtlib",
 		"libbacktrace_headers",
 		"libbase_headers",
-		"libbinderthreadstate",
 		"libcgrouprc",
 		"libcgrouprc_format",
 		"libcutils",
@@ -871,13 +857,11 @@
 		"libhidltransport-impl-internal",
 		"libhwbinder-impl-internal",
 		"libjsoncpp",
-		"liblog",
 		"liblog_headers",
 		"libprocessgroup",
 		"libprocessgroup_headers",
 		"libsystem_headers",
 		"libtetherutilsjni",
-		"libutils",
 		"libutils_headers",
 		"libvndksupport",
 		"tethering-aidl-interfaces-java",
@@ -924,7 +908,6 @@
 		"libprotobuf-java-lite",
 		"libprotobuf-java-nano",
 		"libsystem_headers",
-		"libutils",
 		"libutils_headers",
 		"libwifi-jni",
 		"net-utils-services-common",
@@ -1032,7 +1015,7 @@
 }
 
 func RegisterPostDepsMutators(ctx android.RegisterMutatorsContext) {
-	ctx.BottomUp("apex_deps", apexDepsMutator)
+	ctx.TopDown("apex_deps", apexDepsMutator)
 	ctx.BottomUp("apex", apexMutator).Parallel()
 	ctx.BottomUp("apex_flattened", apexFlattenedMutator).Parallel()
 	ctx.BottomUp("apex_uses", apexUsesMutator).Parallel()
@@ -1040,29 +1023,29 @@
 
 // Mark the direct and transitive dependencies of apex bundles so that they
 // can be built for the apex bundles.
-func apexDepsMutator(mctx android.BottomUpMutatorContext) {
+func apexDepsMutator(mctx android.TopDownMutatorContext) {
+	var apexBundles []android.ApexInfo
+	var directDep bool
 	if a, ok := mctx.Module().(*apexBundle); ok && !a.vndkApex {
-		apexBundleName := mctx.ModuleName()
-		mctx.WalkDeps(func(child, parent android.Module) bool {
-			depName := mctx.OtherModuleName(child)
-			// If the parent is apexBundle, this child is directly depended.
-			_, directDep := parent.(*apexBundle)
-			if a.installable() && !a.testApex {
-				// TODO(b/123892969): Workaround for not having any way to annotate test-apexs
-				// non-installable apex's cannot be installed and so should not prevent libraries from being
-				// installed to the system.
-				android.UpdateApexDependency(apexBundleName, depName, directDep)
-			}
-
-			if am, ok := child.(android.ApexModule); ok && am.CanHaveApexVariants() &&
-				(directDep || am.DepIsInSameApex(mctx, child)) {
-				am.BuildForApex(apexBundleName)
-				return true
-			} else {
-				return false
-			}
-		})
+		apexBundles = []android.ApexInfo{{mctx.ModuleName(), proptools.Bool(a.properties.Legacy_android10_support)}}
+		directDep = true
+	} else if am, ok := mctx.Module().(android.ApexModule); ok {
+		apexBundles = am.ApexVariations()
+		directDep = false
 	}
+
+	if len(apexBundles) == 0 {
+		return
+	}
+
+	mctx.VisitDirectDeps(func(child android.Module) {
+		depName := mctx.OtherModuleName(child)
+		if am, ok := child.(android.ApexModule); ok && am.CanHaveApexVariants() &&
+			(directDep || am.DepIsInSameApex(mctx, child)) {
+			android.UpdateApexDependency(apexBundles, depName, directDep)
+			am.BuildForApexes(apexBundles)
+		}
+	})
 }
 
 // Create apex variations if a module is included in APEX(s).
@@ -1466,6 +1449,12 @@
 	return false
 }
 
+type depInfo struct {
+	to         string
+	from       []string
+	isExternal bool
+}
+
 type apexBundle struct {
 	android.ModuleBase
 	android.DefaultableModuleBase
@@ -1499,10 +1488,8 @@
 	// list of module names that should be installed along with this APEX
 	requiredDeps []string
 
-	// list of module names that this APEX is depending on (to be shown via *-deps-info target)
-	externalDeps []string
 	// list of module names that this APEX is including (to be shown via *-deps-info target)
-	internalDeps []string
+	depInfos map[string]depInfo
 
 	testApex        bool
 	vndkApex        bool
@@ -1936,21 +1923,9 @@
 	return true
 }
 
-// Ensures that the dependencies are marked as available for this APEX
-func (a *apexBundle) checkApexAvailability(ctx android.ModuleContext) {
-	// Let's be practical. Availability for test, host, and the VNDK apex isn't important
-	if ctx.Host() || a.testApex || a.vndkApex {
-		return
-	}
-
-	checkDep := func(ctx android.ModuleContext, am android.ApexModule) {
-		apexName := ctx.ModuleName()
-		if am.AvailableFor(apexName) || whitelistedApexAvailable(apexName, am) {
-			return
-		}
-		ctx.ModuleErrorf("requires %q that is not available for the APEX.", am.Name())
-	}
-
+// Visit dependencies that contributes to the payload of this APEX
+func (a *apexBundle) walkPayloadDeps(ctx android.ModuleContext,
+	do func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool)) {
 	ctx.WalkDepsBlueprint(func(child, parent blueprint.Module) bool {
 		am, ok := child.(android.ApexModule)
 		if !ok || !am.CanHaveApexVariants() {
@@ -1960,7 +1935,7 @@
 		// Check for the direct dependencies that contribute to the payload
 		if dt, ok := ctx.OtherModuleDependencyTag(child).(dependencyTag); ok {
 			if dt.payload {
-				checkDep(ctx, am)
+				do(ctx, parent, am, false /* externalDep */)
 				return true
 			}
 			return false
@@ -1968,15 +1943,58 @@
 
 		// Check for the indirect dependencies if it is considered as part of the APEX
 		if am.DepIsInSameApex(ctx, am) {
-			checkDep(ctx, am)
+			do(ctx, parent, am, false /* externalDep */)
 			return true
 		}
 
+		do(ctx, parent, am, true /* externalDep */)
+
 		// As soon as the dependency graph crosses the APEX boundary, don't go further.
 		return false
 	})
 }
 
+// Ensures that the dependencies are marked as available for this APEX
+func (a *apexBundle) checkApexAvailability(ctx android.ModuleContext) {
+	// Let's be practical. Availability for test, host, and the VNDK apex isn't important
+	if ctx.Host() || a.testApex || a.vndkApex {
+		return
+	}
+
+	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) {
+		apexName := ctx.ModuleName()
+		if externalDep || to.AvailableFor(apexName) || whitelistedApexAvailable(apexName, to) {
+			return
+		}
+		ctx.ModuleErrorf("requires %q that is not available for the APEX.", to.Name())
+	})
+}
+
+// Collects the list of module names that directly or indirectly contributes to the payload of this APEX
+func (a *apexBundle) collectDepsInfo(ctx android.ModuleContext) {
+	a.depInfos = make(map[string]depInfo)
+	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) {
+		if from.Name() == to.Name() {
+			// This can happen for cc.reuseObjTag. We are not interested in tracking this.
+			return
+		}
+
+		if info, exists := a.depInfos[to.Name()]; exists {
+			if !android.InList(from.Name(), info.from) {
+				info.from = append(info.from, from.Name())
+			}
+			info.isExternal = info.isExternal && externalDep
+			a.depInfos[to.Name()] = info
+		} else {
+			a.depInfos[to.Name()] = depInfo{
+				to:         to.Name(),
+				from:       []string{from.Name()},
+				isExternal: externalDep,
+			}
+		}
+	})
+}
+
 func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	buildFlattenedAsDefault := ctx.Config().FlattenApex() && !ctx.Config().UnbundledBuild()
 	switch a.properties.ApexType {
@@ -2014,6 +2032,8 @@
 
 	a.checkApexAvailability(ctx)
 
+	a.collectDepsInfo(ctx)
+
 	handleSpecialLibs := !android.Bool(a.properties.Ignore_system_library_special_case)
 
 	// native lib dependencies
@@ -2045,13 +2065,11 @@
 	})
 
 	var filesInfo []apexFile
+	// TODO(jiyong) do this using walkPayloadDeps
 	ctx.WalkDepsBlueprint(func(child, parent blueprint.Module) bool {
 		depTag := ctx.OtherModuleDependencyTag(child)
 		depName := ctx.OtherModuleName(child)
 		if _, isDirectDep := parent.(*apexBundle); isDirectDep {
-			if depTag != keyTag && depTag != certificateTag {
-				a.internalDeps = append(a.internalDeps, depName)
-			}
 			switch depTag {
 			case sharedLibTag:
 				if c, ok := child.(*cc.Module); ok {
@@ -2188,7 +2206,6 @@
 							if !android.DirectlyInAnyApex(ctx, cc.Name()) && !android.InList(cc.Name(), a.requiredDeps) {
 								a.requiredDeps = append(a.requiredDeps, cc.Name())
 							}
-							a.externalDeps = append(a.externalDeps, depName)
 							requireNativeLibs = append(requireNativeLibs, cc.OutputFile().Path().Base())
 							// Don't track further
 							return false
@@ -2196,8 +2213,6 @@
 						af := apexFileForNativeLibrary(ctx, cc, handleSpecialLibs)
 						af.transitiveDep = true
 						filesInfo = append(filesInfo, af)
-						a.internalDeps = append(a.internalDeps, depName)
-						a.internalDeps = append(a.internalDeps, cc.AllStaticDeps()...)
 						return true // track transitive dependencies
 					}
 				} else if cc.IsTestPerSrcDepTag(depTag) {
@@ -2214,10 +2229,7 @@
 						return true // track transitive dependencies
 					}
 				} else if java.IsJniDepTag(depTag) {
-					a.externalDeps = append(a.externalDeps, depName)
 					return true
-				} else if java.IsStaticLibDepTag(depTag) {
-					a.internalDeps = append(a.internalDeps, depName)
 				} else if am.CanHaveApexVariants() && am.IsInstallableToApex() {
 					ctx.ModuleErrorf("unexpected tag %q for indirect dependency %q", depTag, depName)
 				}
@@ -2365,12 +2377,16 @@
 	return bundle
 }
 
+// apex_test is an APEX for testing. The difference from the ordinary apex module type is that
+// certain compatibility checks such as apex_available are not done for apex_test.
 func testApexBundleFactory() android.Module {
 	bundle := newApexBundle()
 	bundle.testApex = true
 	return bundle
 }
 
+// apex packages other modules into an APEX file which is a packaging format for system-level
+// components like binaries, shared libraries, etc.
 func BundleFactory() android.Module {
 	return newApexBundle()
 }
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 508bde6..5000c88 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -453,7 +453,6 @@
 			srcs: ["foo/bar/MyClass.java"],
 			sdk_version: "none",
 			system_modules: "none",
-			compile_dex: true,
 			static_libs: ["myotherjar"],
 			libs: ["mysharedjar"],
 			// TODO: remove //apex_available:platform
@@ -468,7 +467,6 @@
 			srcs: ["foo/bar/MyClass.java"],
 			sdk_version: "none",
 			system_modules: "none",
-			compile_dex: true,
 			// TODO: remove //apex_available:platform
 			apex_available: [
 				"//apex_available:platform",
@@ -481,7 +479,6 @@
 			srcs: ["foo/bar/MyClass.java"],
 			sdk_version: "none",
 			system_modules: "none",
-			compile_dex: true,
 		}
 	`)
 
@@ -549,10 +546,11 @@
 	ensureListContains(t, noticeInputs, "custom_notice")
 
 	depsInfo := strings.Split(ctx.ModuleForTests("myapex", "android_common_myapex_image").Output("myapex-deps-info.txt").Args["content"], "\\n")
-	ensureListContains(t, depsInfo, "internal myjar")
-	ensureListContains(t, depsInfo, "internal mylib")
-	ensureListContains(t, depsInfo, "internal mylib2")
-	ensureListContains(t, depsInfo, "internal myotherjar")
+	ensureListContains(t, depsInfo, "myjar <- myapex")
+	ensureListContains(t, depsInfo, "mylib <- myapex")
+	ensureListContains(t, depsInfo, "mylib2 <- mylib")
+	ensureListContains(t, depsInfo, "myotherjar <- myjar")
+	ensureListContains(t, depsInfo, "mysharedjar (external) <- myjar")
 }
 
 func TestDefaults(t *testing.T) {
@@ -594,7 +592,6 @@
 			srcs: ["foo/bar/MyClass.java"],
 			sdk_version: "none",
 			system_modules: "none",
-			compile_dex: true,
 			apex_available: [ "myapex" ],
 		}
 
@@ -796,6 +793,7 @@
 			name: "mylib",
 			srcs: ["mylib.cpp"],
 			shared_libs: ["libfoo#10"],
+			static_libs: ["libbaz"],
 			system_shared_libs: [],
 			stl: "none",
 			apex_available: [ "myapex2" ],
@@ -819,6 +817,14 @@
 			stl: "none",
 		}
 
+		cc_library_static {
+			name: "libbaz",
+			srcs: ["mylib.cpp"],
+			system_shared_libs: [],
+			stl: "none",
+			apex_available: [ "myapex2" ],
+		}
+
 	`)
 
 	apexRule := ctx.ModuleForTests("myapex2", "android_common_myapex2_image").Rule("apexRule")
@@ -846,10 +852,10 @@
 	ensureNotContains(t, libFooStubsLdFlags, "libbar.so")
 
 	depsInfo := strings.Split(ctx.ModuleForTests("myapex2", "android_common_myapex2_image").Output("myapex2-deps-info.txt").Args["content"], "\\n")
-	ensureListContains(t, depsInfo, "internal mylib")
-	ensureListContains(t, depsInfo, "external libfoo")
-	ensureListNotContains(t, depsInfo, "internal libfoo")
-	ensureListNotContains(t, depsInfo, "external mylib")
+
+	ensureListContains(t, depsInfo, "mylib <- myapex2")
+	ensureListContains(t, depsInfo, "libbaz <- mylib")
+	ensureListContains(t, depsInfo, "libfoo (external) <- mylib")
 }
 
 func TestApexWithRuntimeLibsDependency(t *testing.T) {
@@ -2361,11 +2367,6 @@
 
 	// Ensure that the platform variant ends with _shared
 	ensureListContains(t, ctx.ModuleVariantsForTests("mylib_common_test"), "android_arm64_armv8-a_shared")
-
-	if android.InAnyApex("mylib_common_test") {
-		t.Log("Found mylib_common_test in some apex!")
-		t.Fail()
-	}
 }
 
 func TestApexWithTarget(t *testing.T) {
@@ -2987,7 +2988,6 @@
 			srcs: ["foo/bar/MyClass.java"],
 			sdk_version: "none",
 			system_modules: "none",
-			compile_dex: true,
 			enabled: false,
 		}
 	`)
@@ -3437,6 +3437,7 @@
 		apex {
 			name: "myapex",
 			key: "myapex.key",
+			native_shared_libs: ["mylib"],
 			legacy_android10_support: true,
 		}
 
@@ -3445,12 +3446,54 @@
 			public_key: "testkey.avbpubkey",
 			private_key: "testkey.pem",
 		}
-	`)
+
+		cc_library {
+			name: "mylib",
+			srcs: ["mylib.cpp"],
+			stl: "libc++",
+			system_shared_libs: [],
+			apex_available: [ "myapex" ],
+		}
+
+		cc_library {
+			name: "libc++",
+			srcs: ["mylib.cpp"],
+			stl: "none",
+			system_shared_libs: [],
+			apex_available: [ "myapex" ],
+		}
+
+		cc_library_static {
+			name: "libc++demangle",
+			srcs: ["mylib.cpp"],
+			stl: "none",
+			system_shared_libs: [],
+		}
+
+		cc_library_static {
+			name: "libunwind_llvm",
+			srcs: ["mylib.cpp"],
+			stl: "none",
+			system_shared_libs: [],
+		}
+	`, withUnbundledBuild)
 
 	module := ctx.ModuleForTests("myapex", "android_common_myapex_image")
 	args := module.Rule("apexRule").Args
 	ensureContains(t, args["opt_flags"], "--manifest_json "+module.Output("apex_manifest.json").Output.String())
 	ensureNotContains(t, args["opt_flags"], "--no_hashtree")
+
+	// The copies of the libraries in the apex should have one more dependency than
+	// the ones outside the apex, namely the unwinder. Ideally we should check
+	// the dependency names directly here but for some reason the names are blank in
+	// this test.
+	for _, lib := range []string{"libc++", "mylib"} {
+		apexImplicits := ctx.ModuleForTests(lib, "android_arm64_armv8-a_shared_myapex").Rule("ld").Implicits
+		nonApexImplicits := ctx.ModuleForTests(lib, "android_arm64_armv8-a_shared").Rule("ld").Implicits
+		if len(apexImplicits) != len(nonApexImplicits)+1 {
+			t.Errorf("%q missing unwinder dep", lib)
+		}
+	}
 }
 
 func TestJavaSDKLibrary(t *testing.T) {
@@ -3518,7 +3561,6 @@
 			srcs: ["foo/bar/MyClass.java"],
 			sdk_version: "none",
 			system_modules: "none",
-			compile_dex: true,
 			apex_available: [ "myapex" ],
 		}
 	`)
@@ -3547,6 +3589,7 @@
 			srcs: ["foo/bar/MyClass.java"],
 			sdk_version: "none",
 			system_modules: "none",
+			compile_dex: false,
 		}
 	`)
 }
@@ -3633,7 +3676,6 @@
 			sdk_version: "none",
 			system_modules: "none",
 			libs: ["myotherjar"],
-			compile_dex: true,
 			apex_available: [
 				"myapex",
 				"//apex_available:platform",
diff --git a/apex/builder.go b/apex/builder.go
index 51818eb..5e0baf4 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -239,7 +239,7 @@
 	rule.Command().
 		Implicit(builtApex).
 		Text("(cd " + imageDir.String() + " ; ").
-		Text("find . -type f -printf \"%s %p\\n\") ").
+		Text("find . \\( -type f -o -type l \\) -printf \"%s %p\\n\") ").
 		Text(" | sort -nr > ").
 		Output(output)
 	rule.Build(pctx, ctx, "installed-files."+a.Name(), "Installed files")
@@ -596,19 +596,14 @@
 		return
 	}
 
-	internalDeps := a.internalDeps
-	externalDeps := a.externalDeps
-
-	internalDeps = android.SortedUniqueStrings(internalDeps)
-	externalDeps = android.SortedUniqueStrings(externalDeps)
-	externalDeps = android.RemoveListFromList(externalDeps, internalDeps)
-
 	var content strings.Builder
-	for _, name := range internalDeps {
-		fmt.Fprintf(&content, "internal %s\\n", name)
-	}
-	for _, name := range externalDeps {
-		fmt.Fprintf(&content, "external %s\\n", name)
+	for _, key := range android.SortedStringKeys(a.depInfos) {
+		info := a.depInfos[key]
+		toName := info.to
+		if info.isExternal {
+			toName = toName + " (external)"
+		}
+		fmt.Fprintf(&content, "%s <- %s\\n", toName, strings.Join(android.SortedUniqueStrings(info.from), ", "))
 	}
 
 	depsInfoFile := android.PathForOutput(ctx, a.Name()+"-deps-info.txt")
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 137cb63..d8210fc 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -413,9 +413,12 @@
 }
 
 func (c *vndkPrebuiltLibraryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
+	// Each vndk prebuilt is exported to androidMk only when BOARD_VNDK_VERSION != current
+	// and the version of the prebuilt is same as BOARD_VNDK_VERSION.
 	ret.Class = "SHARED_LIBRARIES"
 
-	ret.SubName = c.NameSuffix()
+	// shouldn't add any suffixes due to mk modules
+	ret.SubName = ""
 
 	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
 		c.libraryDecorator.androidMkWriteExportedFlags(w)
@@ -426,6 +429,61 @@
 		fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := "+suffix)
 		fmt.Fprintln(w, "LOCAL_MODULE_PATH := "+path)
 		fmt.Fprintln(w, "LOCAL_MODULE_STEM := "+stem)
+		if c.tocFile.Valid() {
+			fmt.Fprintln(w, "LOCAL_SOONG_TOC := "+c.tocFile.String())
+		}
+	})
+}
+
+func (c *vendorSnapshotLibraryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
+	// Each vendor snapshot is exported to androidMk only when BOARD_VNDK_VERSION != current
+	// and the version of the prebuilt is same as BOARD_VNDK_VERSION.
+	if c.shared() {
+		ret.Class = "SHARED_LIBRARIES"
+	} else if c.static() {
+		ret.Class = "STATIC_LIBRARIES"
+	} else if c.header() {
+		ret.Class = "HEADER_LIBRARIES"
+	}
+
+	if c.androidMkVendorSuffix {
+		ret.SubName = vendorSuffix
+	} else {
+		ret.SubName = ""
+	}
+
+	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
+		c.libraryDecorator.androidMkWriteExportedFlags(w)
+
+		if c.shared() {
+			path, file := filepath.Split(c.path.ToMakePath().String())
+			stem, suffix, ext := android.SplitFileExt(file)
+			fmt.Fprintln(w, "LOCAL_BUILT_MODULE_STEM := $(LOCAL_MODULE)"+ext)
+			fmt.Fprintln(w, "LOCAL_MODULE_SUFFIX := "+suffix)
+			if c.shared() {
+				fmt.Fprintln(w, "LOCAL_MODULE_PATH := "+path)
+				fmt.Fprintln(w, "LOCAL_MODULE_STEM := "+stem)
+			}
+			if c.tocFile.Valid() {
+				fmt.Fprintln(w, "LOCAL_SOONG_TOC := "+c.tocFile.String())
+			}
+		} else { // static or header
+			fmt.Fprintln(w, "LOCAL_UNINSTALLABLE_MODULE := true")
+		}
+	})
+}
+
+func (c *vendorSnapshotBinaryDecorator) AndroidMk(ctx AndroidMkContext, ret *android.AndroidMkData) {
+	ret.Class = "EXECUTABLES"
+
+	if c.androidMkVendorSuffix {
+		ret.SubName = vendorSuffix
+	} else {
+		ret.SubName = ""
+	}
+
+	ret.Extra = append(ret.Extra, func(w io.Writer, outputFile android.Path) {
+		fmt.Fprintln(w, "LOCAL_MODULE_SYMLINKS := "+strings.Join(c.Properties.Symlinks, " "))
 	})
 }
 
diff --git a/cc/cc.go b/cc/cc.go
index 2e55841..5af8459 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -49,6 +49,8 @@
 		ctx.BottomUp("version", VersionMutator).Parallel()
 		ctx.BottomUp("begin", BeginMutator).Parallel()
 		ctx.BottomUp("sysprop_cc", SyspropMutator).Parallel()
+		ctx.BottomUp("vendor_snapshot", VendorSnapshotMutator).Parallel()
+		ctx.BottomUp("vendor_snapshot_source", VendorSnapshotSourceMutator).Parallel()
 	})
 
 	ctx.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
@@ -93,6 +95,8 @@
 	HeaderLibs                                  []string
 	RuntimeLibs                                 []string
 
+	StaticUnwinderIfLegacy bool
+
 	ReexportSharedLibHeaders, ReexportStaticLibHeaders, ReexportHeaderLibHeaders []string
 
 	ObjFiles []string
@@ -242,6 +246,10 @@
 	// Even if DeviceConfig().VndkUseCoreVariant() is set, this module must use vendor variant.
 	// see soong/cc/config/vndk.go
 	MustUseVendorVariant bool `blueprint:"mutated"`
+
+	// Used by vendor snapshot to record dependencies from snapshot modules.
+	SnapshotSharedLibs  []string `blueprint:"mutated"`
+	SnapshotRuntimeLibs []string `blueprint:"mutated"`
 }
 
 type VendorProperties struct {
@@ -379,6 +387,7 @@
 	lateSharedDepTag      = DependencyTag{Name: "late shared", Library: true, Shared: true}
 	staticExportDepTag    = DependencyTag{Name: "static", Library: true, ReexportFlags: true}
 	lateStaticDepTag      = DependencyTag{Name: "late static", Library: true}
+	staticUnwinderDepTag  = DependencyTag{Name: "static unwinder", 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}
@@ -403,13 +412,6 @@
 	return ok && ccDepTag.Shared
 }
 
-func IsStaticDepTag(depTag blueprint.DependencyTag) bool {
-	ccDepTag, ok := depTag.(DependencyTag)
-	return ok && (ccDepTag == staticExportDepTag ||
-		ccDepTag == lateStaticDepTag ||
-		ccDepTag == wholeStaticDepTag)
-}
-
 func IsRuntimeDepTag(depTag blueprint.DependencyTag) bool {
 	ccDepTag, ok := depTag.(DependencyTag)
 	return ok && ccDepTag == runtimeDepTag
@@ -451,9 +453,6 @@
 	vndkdep   *vndkdep
 	lto       *lto
 	pgo       *pgo
-	xom       *xom
-
-	androidMkSharedLibDeps []string
 
 	outputFile android.OptionalPath
 
@@ -475,9 +474,6 @@
 	makeLinkType string
 	// Kythe (source file indexer) paths for this compilation module
 	kytheFiles android.Paths
-
-	// name of the modules that are direct or indirect static deps of this module
-	allStaticDeps []string
 }
 
 func (c *Module) Toc() android.OptionalPath {
@@ -740,9 +736,6 @@
 	if c.pgo != nil {
 		c.AddProperties(c.pgo.props()...)
 	}
-	if c.xom != nil {
-		c.AddProperties(c.xom.props()...)
-	}
 	for _, feature := range c.features {
 		c.AddProperties(feature.props()...)
 	}
@@ -930,6 +923,19 @@
 	return c.linker != nil && c.linker.nativeCoverage()
 }
 
+func (c *Module) isSnapshotPrebuilt() bool {
+	if _, ok := c.linker.(*vndkPrebuiltLibraryDecorator); ok {
+		return true
+	}
+	if _, ok := c.linker.(*vendorSnapshotLibraryDecorator); ok {
+		return true
+	}
+	if _, ok := c.linker.(*vendorSnapshotBinaryDecorator); ok {
+		return true
+	}
+	return false
+}
+
 func (c *Module) ExportedIncludeDirs() android.Paths {
 	if flagsProducer, ok := c.linker.(exportedFlagsProducer); ok {
 		return flagsProducer.exportedDirs()
@@ -1199,7 +1205,6 @@
 	module.vndkdep = &vndkdep{}
 	module.lto = &lto{}
 	module.pgo = &pgo{}
-	module.xom = &xom{}
 	return module
 }
 
@@ -1288,15 +1293,6 @@
 	return results
 }
 
-func gatherTransitiveStaticDeps(staticDeps []LinkableInterface) []string {
-	var ret []string
-	for _, dep := range staticDeps {
-		ret = append(ret, dep.Module().Name())
-		ret = append(ret, dep.AllStaticDeps()...)
-	}
-	return android.FirstUniqueStrings(ret)
-}
-
 func (c *Module) IsTestPerSrcAllTestsVariation() bool {
 	test, ok := c.linker.(testPerSrc)
 	return ok && test.isAllTestsVariation()
@@ -1403,9 +1399,6 @@
 	if c.pgo != nil {
 		flags = c.pgo.flags(ctx, flags)
 	}
-	if c.xom != nil {
-		flags = c.xom.flags(ctx, flags)
-	}
 	for _, feature := range c.features {
 		flags = feature.flags(ctx, flags)
 	}
@@ -1624,6 +1617,10 @@
 }
 
 func (c *Module) DepsMutator(actx android.BottomUpMutatorContext) {
+	if !c.Enabled() {
+		return
+	}
+
 	ctx := &depsContext{
 		BottomUpMutatorContext: actx,
 		moduleContextImpl: moduleContextImpl{
@@ -1639,7 +1636,7 @@
 	if ctx.Os() == android.Android {
 		version := ctx.sdkVersion()
 
-		// rewriteNdkLibs takes a list of names of shared libraries and scans it for three types
+		// rewriteLibs 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.
@@ -1655,7 +1652,26 @@
 		// nonvariantLibs
 
 		vendorPublicLibraries := vendorPublicLibraries(actx.Config())
-		rewriteNdkLibs := func(list []string) (nonvariantLibs []string, variantLibs []string) {
+		vendorSnapshotSharedLibs := vendorSnapshotSharedLibs(actx.Config())
+
+		rewriteVendorLibs := func(lib string) string {
+			if isLlndkLibrary(lib, ctx.Config()) {
+				return lib + llndkLibrarySuffix
+			}
+
+			// only modules with BOARD_VNDK_VERSION uses snapshot.
+			if c.VndkVersion() != actx.DeviceConfig().VndkVersion() {
+				return lib
+			}
+
+			if snapshot, ok := vendorSnapshotSharedLibs.get(lib, actx.Arch().ArchType); ok {
+				return snapshot
+			}
+
+			return lib
+		}
+
+		rewriteLibs := func(list []string) (nonvariantLibs []string, variantLibs []string) {
 			variantLibs = []string{}
 			nonvariantLibs = []string{}
 			for _, entry := range list {
@@ -1667,8 +1683,8 @@
 					} else {
 						variantLibs = append(variantLibs, name+ndkLibrarySuffix)
 					}
-				} else if ctx.useVndk() && isLlndkLibrary(name, ctx.Config()) {
-					nonvariantLibs = append(nonvariantLibs, name+llndkLibrarySuffix)
+				} else if ctx.useVndk() {
+					nonvariantLibs = append(nonvariantLibs, rewriteVendorLibs(entry))
 				} else if (ctx.Platform() || ctx.ProductSpecific()) && inList(name, *vendorPublicLibraries) {
 					vendorPublicLib := name + vendorPublicLibrarySuffix
 					if actx.OtherModuleExists(vendorPublicLib) {
@@ -1687,9 +1703,14 @@
 			return nonvariantLibs, variantLibs
 		}
 
-		deps.SharedLibs, variantNdkLibs = rewriteNdkLibs(deps.SharedLibs)
-		deps.LateSharedLibs, variantLateNdkLibs = rewriteNdkLibs(deps.LateSharedLibs)
-		deps.ReexportSharedLibHeaders, _ = rewriteNdkLibs(deps.ReexportSharedLibHeaders)
+		deps.SharedLibs, variantNdkLibs = rewriteLibs(deps.SharedLibs)
+		deps.LateSharedLibs, variantLateNdkLibs = rewriteLibs(deps.LateSharedLibs)
+		deps.ReexportSharedLibHeaders, _ = rewriteLibs(deps.ReexportSharedLibHeaders)
+		if ctx.useVndk() {
+			for idx, lib := range deps.RuntimeLibs {
+				deps.RuntimeLibs[idx] = rewriteVendorLibs(lib)
+			}
+		}
 	}
 
 	buildStubs := false
@@ -1701,11 +1722,28 @@
 		}
 	}
 
+	rewriteSnapshotLibs := func(lib string, snapshotMap *snapshotMap) string {
+		// only modules with BOARD_VNDK_VERSION uses snapshot.
+		if c.VndkVersion() != actx.DeviceConfig().VndkVersion() {
+			return lib
+		}
+
+		if snapshot, ok := snapshotMap.get(lib, actx.Arch().ArchType); ok {
+			return snapshot
+		}
+
+		return lib
+	}
+
+	vendorSnapshotHeaderLibs := vendorSnapshotHeaderLibs(actx.Config())
 	for _, lib := range deps.HeaderLibs {
 		depTag := headerDepTag
 		if inList(lib, deps.ReexportHeaderLibHeaders) {
 			depTag = headerExportDepTag
 		}
+
+		lib = rewriteSnapshotLibs(lib, vendorSnapshotHeaderLibs)
+
 		if buildStubs {
 			actx.AddFarVariationDependencies(append(ctx.Target().Variations(), c.ImageVariation()),
 				depTag, lib)
@@ -1721,12 +1759,16 @@
 	}
 
 	syspropImplLibraries := syspropImplLibraries(actx.Config())
+	vendorSnapshotStaticLibs := vendorSnapshotStaticLibs(actx.Config())
 
 	for _, lib := range deps.WholeStaticLibs {
 		depTag := wholeStaticDepTag
 		if impl, ok := syspropImplLibraries[lib]; ok {
 			lib = impl
 		}
+
+		lib = rewriteSnapshotLibs(lib, vendorSnapshotStaticLibs)
+
 		actx.AddVariationDependencies([]blueprint.Variation{
 			{Mutator: "link", Variation: "static"},
 		}, depTag, lib)
@@ -1742,14 +1784,24 @@
 			lib = impl
 		}
 
+		lib = rewriteSnapshotLibs(lib, vendorSnapshotStaticLibs)
+
 		actx.AddVariationDependencies([]blueprint.Variation{
 			{Mutator: "link", Variation: "static"},
 		}, depTag, lib)
 	}
 
-	actx.AddVariationDependencies([]blueprint.Variation{
-		{Mutator: "link", Variation: "static"},
-	}, lateStaticDepTag, deps.LateStaticLibs...)
+	if deps.StaticUnwinderIfLegacy && ctx.Config().UnbundledBuild() {
+		actx.AddVariationDependencies([]blueprint.Variation{
+			{Mutator: "link", Variation: "static"},
+		}, staticUnwinderDepTag, staticUnwinder(actx))
+	}
+
+	for _, lib := range deps.LateStaticLibs {
+		actx.AddVariationDependencies([]blueprint.Variation{
+			{Mutator: "link", Variation: "static"},
+		}, lateStaticDepTag, rewriteSnapshotLibs(lib, vendorSnapshotStaticLibs))
+	}
 
 	addSharedLibDependencies := func(depTag DependencyTag, name string, version string) {
 		var variations []blueprint.Variation
@@ -2118,6 +2170,14 @@
 			}
 		}
 
+		if depTag == staticUnwinderDepTag {
+			if c.ApexProperties.Info.LegacyAndroid10Support {
+				depTag = StaticDepTag
+			} else {
+				return
+			}
+		}
+
 		// Extract ExplicitlyVersioned field from the depTag and reset it inside the struct.
 		// Otherwise, SharedDepTag and lateSharedDepTag with ExplicitlyVersioned set to true
 		// won't be matched to SharedDepTag and lateSharedDepTag.
@@ -2296,14 +2356,33 @@
 			*depPtr = append(*depPtr, dep.Path())
 		}
 
-		makeLibName := func(depName string) string {
+		vendorSuffixModules := vendorSuffixModules(ctx.Config())
+
+		baseLibName := func(depName string) string {
 			libName := strings.TrimSuffix(depName, llndkLibrarySuffix)
 			libName = strings.TrimSuffix(libName, vendorPublicLibrarySuffix)
 			libName = strings.TrimPrefix(libName, "prebuilt_")
+			return libName
+		}
+
+		makeLibName := func(depName string) string {
+			libName := baseLibName(depName)
 			isLLndk := isLlndkLibrary(libName, ctx.Config())
 			isVendorPublicLib := inList(libName, *vendorPublicLibraries)
 			bothVendorAndCoreVariantsExist := ccDep.HasVendorVariant() || isLLndk
 
+			if c, ok := ccDep.(*Module); ok {
+				// Use base module name for snapshots when exporting to Makefile.
+				if c.isSnapshotPrebuilt() && !c.IsVndk() {
+					baseName := c.BaseModuleName()
+					if vendorSuffixModules[baseName] {
+						return baseName + ".vendor"
+					} else {
+						return baseName
+					}
+				}
+			}
+
 			if ctx.DeviceConfig().VndkUseCoreVariant() && ccDep.IsVndk() && !ccDep.MustUseVendorVariant() && !c.InRamdisk() && !c.InRecovery() {
 				// The vendor module is a no-vendor-variant VNDK library.  Depend on the
 				// core module instead.
@@ -2343,6 +2422,8 @@
 			// they merely serve as Make dependencies and do not affect this lib itself.
 			c.Properties.AndroidMkSharedLibs = append(
 				c.Properties.AndroidMkSharedLibs, makeLibName(depName))
+			// Record baseLibName for snapshots.
+			c.Properties.SnapshotSharedLibs = append(c.Properties.SnapshotSharedLibs, baseLibName(depName))
 		case ndkStubDepTag, ndkLateStubDepTag:
 			c.Properties.AndroidMkSharedLibs = append(
 				c.Properties.AndroidMkSharedLibs,
@@ -2353,6 +2434,8 @@
 		case runtimeDepTag:
 			c.Properties.AndroidMkRuntimeLibs = append(
 				c.Properties.AndroidMkRuntimeLibs, makeLibName(depName))
+			// Record baseLibName for snapshots.
+			c.Properties.SnapshotRuntimeLibs = append(c.Properties.SnapshotRuntimeLibs, baseLibName(depName))
 		case wholeStaticDepTag:
 			c.Properties.AndroidMkWholeStaticLibs = append(
 				c.Properties.AndroidMkWholeStaticLibs, makeLibName(depName))
@@ -2378,8 +2461,6 @@
 		c.sabi.Properties.ReexportedIncludes = android.FirstUniqueStrings(c.sabi.Properties.ReexportedIncludes)
 	}
 
-	c.allStaticDeps = gatherTransitiveStaticDeps(directStaticDeps)
-
 	return depPaths
 }
 
@@ -2539,10 +2620,6 @@
 	return false
 }
 
-func (c *Module) AllStaticDeps() []string {
-	return c.allStaticDeps
-}
-
 func (c *Module) AndroidMkWriteAdditionalDependenciesForSourceAbiDiff(w io.Writer) {
 	if c.linker != nil {
 		if library, ok := c.linker.(*libraryDecorator); ok {
@@ -2615,7 +2692,6 @@
 		&VndkProperties{},
 		&LTOProperties{},
 		&PgoProperties{},
-		&XomProperties{},
 		&android.ProtoProperties{},
 	)
 
@@ -2733,10 +2809,16 @@
 			platformVndkVersion,
 			productVndkVersion,
 		)
-	} else if lib, ok := m.linker.(*vndkPrebuiltLibraryDecorator); ok {
+	} else if m.isSnapshotPrebuilt() {
 		// Make vendor variants only for the versions in BOARD_VNDK_VERSION and
 		// PRODUCT_EXTRA_VNDK_VERSIONS.
-		vendorVariants = append(vendorVariants, lib.version())
+		if snapshot, ok := m.linker.(interface {
+			version() string
+		}); ok {
+			vendorVariants = append(vendorVariants, snapshot.version())
+		} else {
+			mctx.ModuleErrorf("version is unknown for snapshot prebuilt")
+		}
 	} else if m.HasVendorVariant() && !vendorSpecific {
 		// This will be available in /system, /vendor and /product
 		// or a /system directory that is available to vendor and product.
@@ -2833,6 +2915,14 @@
 		m.Properties.ImageVariationPrefix = VendorVariationPrefix
 		m.Properties.VndkVersion = strings.TrimPrefix(variant, VendorVariationPrefix)
 		squashVendorSrcs(m)
+
+		// Makefile shouldn't know vendor modules other than BOARD_VNDK_VERSION.
+		// Hide other vendor variants to avoid collision.
+		vndkVersion := ctx.DeviceConfig().VndkVersion()
+		if vndkVersion != "current" && vndkVersion != "" && vndkVersion != m.Properties.VndkVersion {
+			m.Properties.HideFromMake = true
+			m.SkipInstall()
+		}
 	} else if strings.HasPrefix(variant, ProductVariationPrefix) {
 		m.Properties.ImageVariationPrefix = ProductVariationPrefix
 		m.Properties.VndkVersion = strings.TrimPrefix(variant, ProductVariationPrefix)
diff --git a/cc/cc_test.go b/cc/cc_test.go
index c105954..b78f1f3 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -258,8 +258,8 @@
 	}
 }
 
-func checkVndkSnapshot(t *testing.T, ctx *android.TestContext, moduleName, snapshotFilename, subDir, variant string) {
-	vndkSnapshot := ctx.SingletonForTests("vndk-snapshot")
+func checkSnapshot(t *testing.T, ctx *android.TestContext, singletonName, moduleName, snapshotFilename, subDir, variant string) {
+	snapshotSingleton := ctx.SingletonForTests(singletonName)
 
 	mod, ok := ctx.ModuleForTests(moduleName, variant).Module().(android.OutputFileProducer)
 	if !ok {
@@ -273,9 +273,9 @@
 	}
 	snapshotPath := filepath.Join(subDir, snapshotFilename)
 
-	out := vndkSnapshot.Output(snapshotPath)
+	out := snapshotSingleton.Output(snapshotPath)
 	if out.Input.String() != outputFiles[0].String() {
-		t.Errorf("The input of VNDK snapshot must be %q, but %q", out.Input.String(), outputFiles[0])
+		t.Errorf("The input of snapshot %q must be %q, but %q", moduleName, out.Input.String(), outputFiles[0])
 	}
 }
 
@@ -398,16 +398,16 @@
 	variant := "android_vendor.VER_arm64_armv8-a_shared"
 	variant2nd := "android_vendor.VER_arm_armv7-a-neon_shared"
 
-	checkVndkSnapshot(t, ctx, "libvndk", "libvndk.so", vndkCoreLibPath, variant)
-	checkVndkSnapshot(t, ctx, "libvndk", "libvndk.so", vndkCoreLib2ndPath, variant2nd)
-	checkVndkSnapshot(t, ctx, "libvndk_sp", "libvndk_sp-x.so", vndkSpLibPath, variant)
-	checkVndkSnapshot(t, ctx, "libvndk_sp", "libvndk_sp-x.so", vndkSpLib2ndPath, variant2nd)
+	checkSnapshot(t, ctx, "vndk-snapshot", "libvndk", "libvndk.so", vndkCoreLibPath, variant)
+	checkSnapshot(t, ctx, "vndk-snapshot", "libvndk", "libvndk.so", vndkCoreLib2ndPath, variant2nd)
+	checkSnapshot(t, ctx, "vndk-snapshot", "libvndk_sp", "libvndk_sp-x.so", vndkSpLibPath, variant)
+	checkSnapshot(t, ctx, "vndk-snapshot", "libvndk_sp", "libvndk_sp-x.so", vndkSpLib2ndPath, variant2nd)
 
 	snapshotConfigsPath := filepath.Join(snapshotVariantPath, "configs")
-	checkVndkSnapshot(t, ctx, "llndk.libraries.txt", "llndk.libraries.txt", snapshotConfigsPath, "")
-	checkVndkSnapshot(t, ctx, "vndkcore.libraries.txt", "vndkcore.libraries.txt", snapshotConfigsPath, "")
-	checkVndkSnapshot(t, ctx, "vndksp.libraries.txt", "vndksp.libraries.txt", snapshotConfigsPath, "")
-	checkVndkSnapshot(t, ctx, "vndkprivate.libraries.txt", "vndkprivate.libraries.txt", snapshotConfigsPath, "")
+	checkSnapshot(t, ctx, "vndk-snapshot", "llndk.libraries.txt", "llndk.libraries.txt", snapshotConfigsPath, "")
+	checkSnapshot(t, ctx, "vndk-snapshot", "vndkcore.libraries.txt", "vndkcore.libraries.txt", snapshotConfigsPath, "")
+	checkSnapshot(t, ctx, "vndk-snapshot", "vndksp.libraries.txt", "vndksp.libraries.txt", snapshotConfigsPath, "")
+	checkSnapshot(t, ctx, "vndk-snapshot", "vndkprivate.libraries.txt", "vndkprivate.libraries.txt", snapshotConfigsPath, "")
 
 	checkVndkOutput(t, ctx, "vndk/vndk.libraries.txt", []string{
 		"LLNDK: libc.so",
@@ -799,6 +799,88 @@
 	`)
 }
 
+func TestVendorSnapshot(t *testing.T) {
+	bp := `
+	cc_library {
+		name: "libvndk",
+		vendor_available: true,
+		vndk: {
+			enabled: true,
+		},
+		nocrt: true,
+	}
+
+	cc_library {
+		name: "libvendor",
+		vendor: true,
+		nocrt: true,
+	}
+
+	cc_library {
+		name: "libvendor_available",
+		vendor_available: true,
+		nocrt: true,
+	}
+
+	cc_library_headers {
+		name: "libvendor_headers",
+		vendor_available: true,
+		nocrt: true,
+	}
+
+	cc_binary {
+		name: "vendor_bin",
+		vendor: true,
+		nocrt: true,
+	}
+
+	cc_binary {
+		name: "vendor_available_bin",
+		vendor_available: true,
+		nocrt: true,
+	}
+`
+	config := TestConfig(buildDir, android.Android, nil, bp, nil)
+	config.TestProductVariables.DeviceVndkVersion = StringPtr("current")
+	config.TestProductVariables.Platform_vndk_version = StringPtr("VER")
+	ctx := testCcWithConfig(t, config)
+
+	// Check Vendor snapshot output.
+
+	snapshotDir := "vendor-snapshot"
+	snapshotVariantPath := filepath.Join(buildDir, snapshotDir, "arm64")
+
+	for _, arch := range [][]string{
+		[]string{"arm64", "armv8-a"},
+		[]string{"arm", "armv7-a-neon"},
+	} {
+		archType := arch[0]
+		archVariant := arch[1]
+		archDir := fmt.Sprintf("arch-%s-%s", archType, archVariant)
+
+		// For shared libraries, only non-VNDK vendor_available modules are captured
+		sharedVariant := fmt.Sprintf("android_vendor.VER_%s_%s_shared", archType, archVariant)
+		sharedDir := filepath.Join(snapshotVariantPath, archDir, "shared")
+		checkSnapshot(t, ctx, "vendor-snapshot", "libvendor", "libvendor.so", sharedDir, sharedVariant)
+		checkSnapshot(t, ctx, "vendor-snapshot", "libvendor_available", "libvendor_available.so", sharedDir, sharedVariant)
+
+		// For static libraries, all vendor:true and vendor_available modules (including VNDK) are captured.
+		staticVariant := fmt.Sprintf("android_vendor.VER_%s_%s_static", archType, archVariant)
+		staticDir := filepath.Join(snapshotVariantPath, archDir, "static")
+		checkSnapshot(t, ctx, "vendor-snapshot", "libvndk", "libvndk.a", staticDir, staticVariant)
+		checkSnapshot(t, ctx, "vendor-snapshot", "libvendor", "libvendor.a", staticDir, staticVariant)
+		checkSnapshot(t, ctx, "vendor-snapshot", "libvendor_available", "libvendor_available.a", staticDir, staticVariant)
+
+		// For binary libraries, all vendor:true and vendor_available modules are captured.
+		if archType == "arm64" {
+			binaryVariant := fmt.Sprintf("android_vendor.VER_%s_%s", archType, archVariant)
+			binaryDir := filepath.Join(snapshotVariantPath, archDir, "binary")
+			checkSnapshot(t, ctx, "vendor-snapshot", "vendor_bin", "vendor_bin", binaryDir, binaryVariant)
+			checkSnapshot(t, ctx, "vendor-snapshot", "vendor_available_bin", "vendor_available_bin", binaryDir, binaryVariant)
+		}
+	}
+}
+
 func TestDoubleLoadableDepError(t *testing.T) {
 	// Check whether an error is emitted when a LLNDK depends on a non-double_loadable VNDK lib.
 	testCcError(t, "module \".*\" variant \".*\": link.* \".*\" which is not LL-NDK, VNDK-SP, .*double_loadable", `
diff --git a/cc/cflag_artifacts.go b/cc/cflag_artifacts.go
index b61f2a8..855ff25 100644
--- a/cc/cflag_artifacts.go
+++ b/cc/cflag_artifacts.go
@@ -41,12 +41,7 @@
 // filter.
 func allowedDir(subdir string) bool {
 	subdir += "/"
-	for _, prefix := range TrackedCFlagsDir {
-		if strings.HasPrefix(subdir, prefix) {
-			return true
-		}
-	}
-	return false
+	return android.HasAnyPrefix(subdir, TrackedCFlagsDir)
 }
 
 func (s *cflagArtifactsText) genFlagFilename(flag string) string {
diff --git a/cc/compiler.go b/cc/compiler.go
index 1ced451..c1a8d96 100644
--- a/cc/compiler.go
+++ b/cc/compiler.go
@@ -241,12 +241,7 @@
 // Return true if the module is in the WarningAllowedProjects.
 func warningsAreAllowed(subdir string) bool {
 	subdir += "/"
-	for _, prefix := range config.WarningAllowedProjects {
-		if strings.HasPrefix(subdir, prefix) {
-			return true
-		}
-	}
-	return false
+	return android.HasAnyPrefix(subdir, config.WarningAllowedProjects)
 }
 
 func addToModuleList(ctx ModuleContext, key android.OnceKey, module string) {
@@ -515,7 +510,7 @@
 
 	// Exclude directories from manual binder interface whitelisting.
 	//TODO(b/145621474): Move this check into IInterface.h when clang-tidy no longer uses absolute paths.
-	if android.PrefixInList(ctx.ModuleDir(), allowedManualInterfacePaths) {
+	if android.HasAnyPrefix(ctx.ModuleDir(), allowedManualInterfacePaths) {
 		flags.Local.CFlags = append(flags.Local.CFlags, "-DDO_NOT_CHECK_MANUAL_BINDER_INTERFACES")
 	}
 
@@ -604,16 +599,12 @@
 func isThirdParty(path string) bool {
 	thirdPartyDirPrefixes := []string{"external/", "vendor/", "hardware/"}
 
-	for _, prefix := range thirdPartyDirPrefixes {
-		if strings.HasPrefix(path, prefix) {
-			for _, prefix := range thirdPartyDirPrefixExceptions {
-				if prefix.MatchString(path) {
-					return false
-				}
+	if android.HasAnyPrefix(path, thirdPartyDirPrefixes) {
+		for _, prefix := range thirdPartyDirPrefixExceptions {
+			if prefix.MatchString(path) {
+				return false
 			}
-			break
 		}
 	}
-
 	return true
 }
diff --git a/cc/config/clang.go b/cc/config/clang.go
index 8618d09..21cabd5 100644
--- a/cc/config/clang.go
+++ b/cc/config/clang.go
@@ -169,6 +169,12 @@
 		"-Wno-reorder-init-list",
 		// http://b/145211066
 		"-Wno-implicit-int-float-conversion",
+		// New warnings to be fixed after clang-r377782.
+		"-Wno-bitwise-conditional-parentheses", // http://b/148286937
+		"-Wno-int-in-bool-context",             // http://b/148287349
+		"-Wno-sizeof-array-div",                // http://b/148815709
+		"-Wno-tautological-bitwise-compare",    // http://b/148831363
+		"-Wno-tautological-overlap-compare",    // http://b/148815696
 	}, " "))
 
 	// Extra cflags for external third-party projects to disable warnings that
diff --git a/cc/config/global.go b/cc/config/global.go
index 333885f..d01dd84 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -127,8 +127,8 @@
 
 	// prebuilts/clang default settings.
 	ClangDefaultBase         = "prebuilts/clang/host"
-	ClangDefaultVersion      = "clang-r370808b"
-	ClangDefaultShortVersion = "10.0.2"
+	ClangDefaultVersion      = "clang-r377782b"
+	ClangDefaultShortVersion = "10.0.4"
 
 	// Directories with warnings from Android.bp files.
 	WarningAllowedProjects = []string{
diff --git a/cc/config/x86_darwin_host.go b/cc/config/x86_darwin_host.go
index 63b9d48..25225b5 100644
--- a/cc/config/x86_darwin_host.go
+++ b/cc/config/x86_darwin_host.go
@@ -100,7 +100,7 @@
 	pctx.VariableFunc("macSdkRoot", func(ctx android.PackageVarContext) string {
 		return xcrunSdk(ctx, "--show-sdk-path")
 	})
-	pctx.StaticVariable("macMinVersion", "10.8")
+	pctx.StaticVariable("macMinVersion", "10.10")
 	pctx.VariableFunc("MacArPath", func(ctx android.PackageVarContext) string {
 		return xcrun(ctx, "--find", "ar")
 	})
diff --git a/cc/library.go b/cc/library.go
index 0bddab5..bca9a96 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -281,11 +281,9 @@
 }
 
 func (f *flagExporter) reexportFlags(flags ...string) {
-	for _, flag := range flags {
-		if strings.HasPrefix(flag, "-I") || strings.HasPrefix(flag, "-isystem") {
-			panic(fmt.Errorf("Exporting invalid flag %q: "+
-				"use reexportDirs or reexportSystemDirs to export directories", flag))
-		}
+	if android.PrefixInList(flags, "-I") || android.PrefixInList(flags, "-isystem") {
+		panic(fmt.Errorf("Exporting invalid flag %q: "+
+			"use reexportDirs or reexportSystemDirs to export directories", flag))
 	}
 	f.flags = append(f.flags, flags...)
 }
diff --git a/cc/linkable.go b/cc/linkable.go
index 2abb112..e4f034c 100644
--- a/cc/linkable.go
+++ b/cc/linkable.go
@@ -54,8 +54,6 @@
 	ToolchainLibrary() bool
 	NdkPrebuiltStl() bool
 	StubDecorator() bool
-
-	AllStaticDeps() []string
 }
 
 type DependencyTag struct {
diff --git a/cc/pgo.go b/cc/pgo.go
index 8eb3400..d5c4b87 100644
--- a/cc/pgo.go
+++ b/cc/pgo.go
@@ -256,6 +256,12 @@
 		}
 	}
 
+	// PGO profile use is not feasible for a Clang coverage build because
+	// -fprofile-use and -fprofile-instr-generate are incompatible.
+	if ctx.DeviceConfig().ClangCoverageEnabled() {
+		return
+	}
+
 	if !ctx.Config().IsEnvTrue("ANDROID_PGO_NO_PROFILE_USE") &&
 		proptools.BoolDefault(pgo.Properties.Pgo.Enable_profile_use, true) {
 		if profileFile := pgo.Properties.getPgoProfileFile(ctx); profileFile.Valid() {
diff --git a/cc/sanitize.go b/cc/sanitize.go
index 93c4b41..5663aa7 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -350,6 +350,12 @@
 		s.Diag.Cfi = nil
 	}
 
+	// Also disable CFI if building against snapshot.
+	vndkVersion := ctx.DeviceConfig().VndkVersion()
+	if ctx.useVndk() && vndkVersion != "current" && vndkVersion != "" {
+		s.Cfi = nil
+	}
+
 	// HWASan ramdisk (which is built from recovery) goes over some bootloader limit.
 	// Keep libc instrumented so that ramdisk / recovery can run hwasan-instrumented code if necessary.
 	if (ctx.inRamdisk() || ctx.inRecovery()) && !strings.HasPrefix(ctx.ModuleDir(), "bionic/libc") {
@@ -739,13 +745,16 @@
 				return false
 			}
 
-			if d, ok := child.(*Module); ok && d.static() && d.sanitize != nil {
+			d, ok := child.(*Module)
+			if !ok || !d.static() {
+				return false
+			}
+			if d.sanitize != nil {
 				if enableMinimalRuntime(d.sanitize) {
 					// If a static dependency is built with the minimal runtime,
 					// make sure we include the ubsan minimal runtime.
 					c.sanitize.Properties.MinimalRuntimeDep = true
-				} else if Bool(d.sanitize.Properties.Sanitize.Diag.Integer_overflow) ||
-					len(d.sanitize.Properties.Sanitize.Diag.Misc_undefined) > 0 {
+				} else if enableUbsanRuntime(d.sanitize) {
 					// If a static dependency runs with full ubsan diagnostics,
 					// make sure we include the ubsan runtime.
 					c.sanitize.Properties.UbsanRuntimeDep = true
@@ -758,9 +767,18 @@
 				}
 
 				return true
-			} else {
-				return false
 			}
+
+			if p, ok := d.linker.(*vendorSnapshotLibraryDecorator); ok {
+				if Bool(p.properties.Sanitize_minimal_dep) {
+					c.sanitize.Properties.MinimalRuntimeDep = true
+				}
+				if Bool(p.properties.Sanitize_ubsan_dep) {
+					c.sanitize.Properties.UbsanRuntimeDep = true
+				}
+			}
+
+			return false
 		})
 	}
 }
@@ -901,12 +919,31 @@
 			// Note that by adding dependency with {static|shared}DepTag, the lib is
 			// added to libFlags and LOCAL_SHARED_LIBRARIES by cc.Module
 			if c.staticBinary() {
+				deps := append(extraStaticDeps, runtimeLibrary)
+				// If we're using snapshots and in vendor, redirect to snapshot whenever possible
+				if c.VndkVersion() == mctx.DeviceConfig().VndkVersion() {
+					snapshots := vendorSnapshotStaticLibs(mctx.Config())
+					for idx, dep := range deps {
+						if lib, ok := snapshots.get(dep, mctx.Arch().ArchType); ok {
+							deps[idx] = lib
+						}
+					}
+				}
+
 				// static executable gets static runtime libs
 				mctx.AddFarVariationDependencies(append(mctx.Target().Variations(), []blueprint.Variation{
 					{Mutator: "link", Variation: "static"},
 					c.ImageVariation(),
-				}...), StaticDepTag, append([]string{runtimeLibrary}, extraStaticDeps...)...)
+				}...), StaticDepTag, deps...)
 			} else if !c.static() && !c.header() {
+				// If we're using snapshots and in vendor, redirect to snapshot whenever possible
+				if c.VndkVersion() == mctx.DeviceConfig().VndkVersion() {
+					snapshots := vendorSnapshotSharedLibs(mctx.Config())
+					if lib, ok := snapshots.get(runtimeLibrary, mctx.Arch().ArchType); ok {
+						runtimeLibrary = lib
+					}
+				}
+
 				// dynamic executable and shared libs get shared runtime libs
 				mctx.AddFarVariationDependencies(append(mctx.Target().Variations(), []blueprint.Variation{
 					{Mutator: "link", Variation: "shared"},
@@ -1052,6 +1089,11 @@
 	return false
 }
 
+func enableUbsanRuntime(sanitize *sanitize) bool {
+	return Bool(sanitize.Properties.Sanitize.Diag.Integer_overflow) ||
+		len(sanitize.Properties.Sanitize.Diag.Misc_undefined) > 0
+}
+
 func cfiMakeVarsProvider(ctx android.MakeVarsContext) {
 	cfiStaticLibs := cfiStaticLibs(ctx.Config())
 	sort.Strings(*cfiStaticLibs)
diff --git a/cc/snapshot_utils.go b/cc/snapshot_utils.go
new file mode 100644
index 0000000..8f48f86
--- /dev/null
+++ b/cc/snapshot_utils.go
@@ -0,0 +1,131 @@
+// 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
+
+import (
+	"strings"
+
+	"android/soong/android"
+)
+
+var (
+	headerExts = []string{".h", ".hh", ".hpp", ".hxx", ".h++", ".inl", ".inc", ".ipp", ".h.generic"}
+)
+
+type snapshotLibraryInterface interface {
+	exportedFlagsProducer
+	libraryInterface
+}
+
+var _ snapshotLibraryInterface = (*prebuiltLibraryLinker)(nil)
+var _ snapshotLibraryInterface = (*libraryDecorator)(nil)
+
+type snapshotMap struct {
+	snapshots map[string]string
+}
+
+func newSnapshotMap() *snapshotMap {
+	return &snapshotMap{
+		snapshots: make(map[string]string),
+	}
+}
+
+func snapshotMapKey(name string, arch android.ArchType) string {
+	return name + ":" + arch.String()
+}
+
+// Adds a snapshot name for given module name and architecture.
+// e.g. add("libbase", X86, "libbase.vndk.29.x86")
+func (s *snapshotMap) add(name string, arch android.ArchType, snapshot string) {
+	s.snapshots[snapshotMapKey(name, arch)] = snapshot
+}
+
+// Returns snapshot name for given module name and architecture, if found.
+// e.g. get("libcutils", X86) => "libcutils.vndk.29.x86", true
+func (s *snapshotMap) get(name string, arch android.ArchType) (snapshot string, found bool) {
+	snapshot, found = s.snapshots[snapshotMapKey(name, arch)]
+	return snapshot, found
+}
+
+func exportedHeaders(ctx android.SingletonContext, l exportedFlagsProducer) android.Paths {
+	var ret android.Paths
+
+	// Headers in the source tree should be globbed. On the contrast, generated headers
+	// can't be globbed, and they should be manually collected.
+	// So, we first filter out intermediate directories (which contains generated headers)
+	// from exported directories, and then glob headers under remaining directories.
+	for _, path := range append(l.exportedDirs(), l.exportedSystemDirs()...) {
+		dir := path.String()
+		// Skip if dir is for generated headers
+		if strings.HasPrefix(dir, android.PathForOutput(ctx).String()) {
+			continue
+		}
+		exts := headerExts
+		// Glob all files under this special directory, because of C++ headers.
+		if strings.HasPrefix(dir, "external/libcxx/include") {
+			exts = []string{""}
+		}
+		for _, ext := range exts {
+			glob, err := ctx.GlobWithDeps(dir+"/**/*"+ext, nil)
+			if err != nil {
+				ctx.Errorf("%#v\n", err)
+				return nil
+			}
+			for _, header := range glob {
+				if strings.HasSuffix(header, "/") {
+					continue
+				}
+				ret = append(ret, android.PathForSource(ctx, header))
+			}
+		}
+	}
+
+	// Collect generated headers
+	for _, header := range append(l.exportedGeneratedHeaders(), l.exportedDeps()...) {
+		// TODO(b/148123511): remove exportedDeps after cleaning up genrule
+		if strings.HasSuffix(header.Base(), "-phony") {
+			continue
+		}
+		ret = append(ret, header)
+	}
+
+	return ret
+}
+
+func copyFile(ctx android.SingletonContext, path android.Path, out string) android.OutputPath {
+	outPath := android.PathForOutput(ctx, out)
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        android.Cp,
+		Input:       path,
+		Output:      outPath,
+		Description: "Cp " + out,
+		Args: map[string]string{
+			"cpFlags": "-f -L",
+		},
+	})
+	return outPath
+}
+
+func writeStringToFile(ctx android.SingletonContext, content, out string) android.OutputPath {
+	outPath := android.PathForOutput(ctx, out)
+	ctx.Build(pctx, android.BuildParams{
+		Rule:        android.WriteFile,
+		Output:      outPath,
+		Description: "WriteFile " + out,
+		Args: map[string]string{
+			"content": content,
+		},
+	})
+	return outPath
+}
diff --git a/cc/stl.go b/cc/stl.go
index af015f9..eda8a4f 100644
--- a/cc/stl.go
+++ b/cc/stl.go
@@ -151,6 +151,14 @@
 	return version < 21
 }
 
+func staticUnwinder(ctx android.BaseModuleContext) string {
+	if ctx.Arch().ArchType == android.Arm {
+		return "libunwind_llvm"
+	} else {
+		return "libgcc_stripped"
+	}
+}
+
 func (stl *stl) deps(ctx BaseModuleContext, deps Deps) Deps {
 	switch stl.Properties.SelectedStl {
 	case "libstdc++":
@@ -172,16 +180,16 @@
 		}
 		if ctx.toolchain().Bionic() {
 			if ctx.staticBinary() {
-				deps.StaticLibs = append(deps.StaticLibs, "libm", "libc")
-				if ctx.Arch().ArchType == android.Arm {
-					deps.StaticLibs = append(deps.StaticLibs, "libunwind_llvm")
-				} else {
-					deps.StaticLibs = append(deps.StaticLibs, "libgcc_stripped")
-				}
+				deps.StaticLibs = append(deps.StaticLibs, "libm", "libc", staticUnwinder(ctx))
+			} else {
+				deps.StaticUnwinderIfLegacy = true
 			}
 		}
 	case "":
 		// None or error.
+		if ctx.toolchain().Bionic() && ctx.Module().Name() == "libc++" {
+			deps.StaticUnwinderIfLegacy = true
+		}
 	case "ndk_system":
 		// TODO: Make a system STL prebuilt for the NDK.
 		// The system STL doesn't have a prebuilt (it uses the system's libstdc++), but it does have
diff --git a/cc/testing.go b/cc/testing.go
index ba8ed95..60e5cf5 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -320,6 +320,7 @@
 	RegisterRequiredBuildComponentsForTest(ctx)
 	ctx.PreArchMutators(android.RegisterDefaultsPreArchMutators)
 	ctx.RegisterSingletonType("vndk-snapshot", VndkSnapshotSingleton)
+	ctx.RegisterSingletonType("vendor-snapshot", VendorSnapshotSingleton)
 
 	return ctx
 }
diff --git a/cc/vendor_snapshot.go b/cc/vendor_snapshot.go
new file mode 100644
index 0000000..d92caa1
--- /dev/null
+++ b/cc/vendor_snapshot.go
@@ -0,0 +1,830 @@
+// 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
+
+import (
+	"encoding/json"
+	"path/filepath"
+	"sort"
+	"strings"
+	"sync"
+
+	"github.com/google/blueprint/proptools"
+
+	"android/soong/android"
+)
+
+const (
+	vendorSnapshotHeaderSuffix = ".vendor_header."
+	vendorSnapshotSharedSuffix = ".vendor_shared."
+	vendorSnapshotStaticSuffix = ".vendor_static."
+	vendorSnapshotBinarySuffix = ".vendor_binary."
+)
+
+var (
+	vendorSnapshotsLock         sync.Mutex
+	vendorSuffixModulesKey      = android.NewOnceKey("vendorSuffixModules")
+	vendorSnapshotHeaderLibsKey = android.NewOnceKey("vendorSnapshotHeaderLibs")
+	vendorSnapshotStaticLibsKey = android.NewOnceKey("vendorSnapshotStaticLibs")
+	vendorSnapshotSharedLibsKey = android.NewOnceKey("vendorSnapshotSharedLibs")
+	vendorSnapshotBinariesKey   = android.NewOnceKey("vendorSnapshotBinaries")
+)
+
+// vendor snapshot maps hold names of vendor snapshot modules per arch.
+func vendorSuffixModules(config android.Config) map[string]bool {
+	return config.Once(vendorSuffixModulesKey, func() interface{} {
+		return make(map[string]bool)
+	}).(map[string]bool)
+}
+
+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)
+}
+
+type vendorSnapshotLibraryProperties struct {
+	// snapshot version.
+	Version string
+
+	// Target arch name of the snapshot (e.g. 'arm64' for variant 'aosp_arm64')
+	Target_arch string
+
+	// Prebuilt file for each arch.
+	Src *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"`
+
+	// Check the prebuilt ELF files (e.g. DT_SONAME, DT_NEEDED, resolution of undefined symbols,
+	// etc).
+	Check_elf_files *bool
+
+	// 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 vendorSnapshotLibraryDecorator struct {
+	*libraryDecorator
+	properties            vendorSnapshotLibraryProperties
+	androidMkVendorSuffix bool
+}
+
+func (p *vendorSnapshotLibraryDecorator) Name(name string) string {
+	return name + p.NameSuffix()
+}
+
+func (p *vendorSnapshotLibraryDecorator) NameSuffix() string {
+	versionSuffix := p.version()
+	if p.arch() != "" {
+		versionSuffix += "." + p.arch()
+	}
+
+	var linkageSuffix string
+	if p.buildShared() {
+		linkageSuffix = vendorSnapshotSharedSuffix
+	} else if p.buildStatic() {
+		linkageSuffix = vendorSnapshotStaticSuffix
+	} else {
+		linkageSuffix = vendorSnapshotHeaderSuffix
+	}
+
+	return linkageSuffix + versionSuffix
+}
+
+func (p *vendorSnapshotLibraryDecorator) version() string {
+	return p.properties.Version
+}
+
+func (p *vendorSnapshotLibraryDecorator) arch() string {
+	return p.properties.Target_arch
+}
+
+func (p *vendorSnapshotLibraryDecorator) linkerFlags(ctx ModuleContext, flags Flags) Flags {
+	p.libraryDecorator.libName = strings.TrimSuffix(ctx.ModuleName(), p.NameSuffix())
+	return p.libraryDecorator.linkerFlags(ctx, flags)
+}
+
+func (p *vendorSnapshotLibraryDecorator) 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
+}
+
+func (p *vendorSnapshotLibraryDecorator) 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.matchesWithDevice(ctx.DeviceConfig()) {
+		return nil
+	}
+
+	p.libraryDecorator.exportIncludes(ctx)
+	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)
+	}
+
+	return in
+}
+
+func (p *vendorSnapshotLibraryDecorator) nativeCoverage() bool {
+	return false
+}
+
+func (p *vendorSnapshotLibraryDecorator) install(ctx ModuleContext, file android.Path) {
+	if p.matchesWithDevice(ctx.DeviceConfig()) && (p.shared() || p.static()) {
+		p.baseInstaller.install(ctx, file)
+	}
+}
+
+type vendorSnapshotInterface interface {
+	version() string
+}
+
+func vendorSnapshotLoadHook(ctx android.LoadHookContext, p vendorSnapshotInterface) {
+	if p.version() != ctx.DeviceConfig().VndkVersion() {
+		ctx.Module().Disable()
+		return
+	}
+}
+
+func vendorSnapshotLibrary() (*Module, *vendorSnapshotLibraryDecorator) {
+	module, library := NewLibrary(android.DeviceSupported)
+
+	module.stl = nil
+	module.sanitize = nil
+	library.StripProperties.Strip.None = BoolPtr(true)
+
+	prebuilt := &vendorSnapshotLibraryDecorator{
+		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
+
+	module.AddProperties(
+		&prebuilt.properties,
+	)
+
+	return module, prebuilt
+}
+
+func VendorSnapshotSharedFactory() android.Module {
+	module, prebuilt := vendorSnapshotLibrary()
+	prebuilt.libraryDecorator.BuildOnlyShared()
+	android.AddLoadHook(module, func(ctx android.LoadHookContext) {
+		vendorSnapshotLoadHook(ctx, prebuilt)
+	})
+	return module.Init()
+}
+
+func VendorSnapshotStaticFactory() android.Module {
+	module, prebuilt := vendorSnapshotLibrary()
+	prebuilt.libraryDecorator.BuildOnlyStatic()
+	android.AddLoadHook(module, func(ctx android.LoadHookContext) {
+		vendorSnapshotLoadHook(ctx, prebuilt)
+	})
+	return module.Init()
+}
+
+func VendorSnapshotHeaderFactory() android.Module {
+	module, prebuilt := vendorSnapshotLibrary()
+	prebuilt.libraryDecorator.HeaderOnly()
+	android.AddLoadHook(module, func(ctx android.LoadHookContext) {
+		vendorSnapshotLoadHook(ctx, prebuilt)
+	})
+	return module.Init()
+}
+
+type vendorSnapshotBinaryProperties struct {
+	// snapshot version.
+	Version string
+
+	// Target arch name of the snapshot (e.g. 'arm64' for variant 'aosp_arm64_ab')
+	Target_arch string
+
+	// Prebuilt file for each arch.
+	Src *string `android:"arch_variant"`
+}
+
+type vendorSnapshotBinaryDecorator struct {
+	*binaryDecorator
+	properties            vendorSnapshotBinaryProperties
+	androidMkVendorSuffix bool
+}
+
+func (p *vendorSnapshotBinaryDecorator) Name(name string) string {
+	return name + p.NameSuffix()
+}
+
+func (p *vendorSnapshotBinaryDecorator) NameSuffix() string {
+	versionSuffix := p.version()
+	if p.arch() != "" {
+		versionSuffix += "." + p.arch()
+	}
+	return vendorSnapshotBinarySuffix + versionSuffix
+}
+
+func (p *vendorSnapshotBinaryDecorator) version() string {
+	return p.properties.Version
+}
+
+func (p *vendorSnapshotBinaryDecorator) arch() string {
+	return p.properties.Target_arch
+}
+
+func (p *vendorSnapshotBinaryDecorator) matchesWithDevice(config android.DeviceConfig) bool {
+	if config.DeviceArch() != p.arch() {
+		return false
+	}
+	if p.properties.Src == nil {
+		return false
+	}
+	return true
+}
+
+func (p *vendorSnapshotBinaryDecorator) 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)
+	builderFlags := flagsToBuilderFlags(flags)
+	p.unstrippedOutputFile = in
+	binName := in.Base()
+	if p.needsStrip(ctx) {
+		stripped := android.PathForModuleOut(ctx, "stripped", binName)
+		p.stripExecutableOrSharedLib(ctx, in, stripped, builderFlags)
+		in = stripped
+	}
+
+	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 VendorSnapshotBinaryFactory() 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 := &vendorSnapshotBinaryDecorator{
+		binaryDecorator: binary,
+	}
+
+	module.compiler = nil
+	module.sanitize = nil
+	module.stl = nil
+	module.linker = prebuilt
+
+	android.AddLoadHook(module, func(ctx android.LoadHookContext) {
+		vendorSnapshotLoadHook(ctx, prebuilt)
+	})
+
+	module.AddProperties(&prebuilt.properties)
+	return module.Init()
+}
+
+func 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)
+}
+
+func VendorSnapshotSingleton() android.Singleton {
+	return &vendorSnapshotSingleton{}
+}
+
+type vendorSnapshotSingleton struct {
+	vendorSnapshotZipFile android.OptionalPath
+}
+
+var (
+	// Modules under following directories are ignored. They are OEM's and vendor's
+	// proprietary modules(device/, vendor/, and hardware/).
+	// TODO(b/65377115): Clean up these with more maintainable way
+	vendorProprietaryDirs = []string{
+		"device",
+		"vendor",
+		"hardware",
+	}
+
+	// Modules under following directories are included as they are in AOSP,
+	// although hardware/ is normally for vendor's own.
+	// TODO(b/65377115): Clean up these with more maintainable way
+	aospDirsUnderProprietary = []string{
+		"hardware/interfaces",
+		"hardware/libhardware",
+		"hardware/libhardware_legacy",
+		"hardware/ril",
+	}
+)
+
+// Determine if a dir under source tree is an SoC-owned proprietary directory, such as
+// device/, vendor/, etc.
+func isVendorProprietaryPath(dir string) bool {
+	for _, p := range vendorProprietaryDirs {
+		if strings.HasPrefix(dir, p) {
+			// filter out AOSP defined directories, e.g. hardware/interfaces/
+			aosp := false
+			for _, p := range aospDirsUnderProprietary {
+				if strings.HasPrefix(dir, p) {
+					aosp = true
+					break
+				}
+			}
+			if !aosp {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// Determine if a module is going to be included in vendor snapshot or not.
+//
+// Targets of vendor snapshot are "vendor: true" or "vendor_available: true" modules in
+// AOSP. They are not guaranteed to be compatible with older vendor images. (e.g. might
+// depend on newer VNDK) So they are captured as vendor snapshot To build older vendor
+// image and newer system image altogether.
+func isVendorSnapshotModule(ctx android.SingletonContext, m *Module) bool {
+	if !m.Enabled() {
+		return false
+	}
+	// skip proprietary modules, but include all VNDK (static)
+	if isVendorProprietaryPath(ctx.ModuleDir(m)) && !m.IsVndk() {
+		return false
+	}
+	if m.Target().Os.Class != android.Device {
+		return false
+	}
+	if m.Target().NativeBridge == android.NativeBridgeEnabled {
+		return false
+	}
+	// the module must be installed in /vendor
+	if !m.installable() || m.isSnapshotPrebuilt() || !m.inVendor() {
+		return false
+	}
+	// exclude test modules
+	if _, ok := m.linker.(interface{ gtest() bool }); ok {
+		return false
+	}
+	// TODO(b/65377115): add full support for sanitizer
+	if m.sanitize != nil && !m.sanitize.isUnsanitizedVariant() {
+		return false
+	}
+
+	// Libraries
+	if l, ok := m.linker.(snapshotLibraryInterface); ok {
+		if l.static() {
+			return proptools.BoolDefault(m.VendorProperties.Vendor_available, true)
+		}
+		if l.shared() {
+			return !m.IsVndk()
+		}
+		return true
+	}
+
+	// Binaries
+	_, ok := m.linker.(*binaryDecorator)
+	if !ok {
+		if _, ok := m.linker.(*prebuiltBinaryLinker); !ok {
+			return false
+		}
+	}
+	return proptools.BoolDefault(m.VendorProperties.Vendor_available, true)
+}
+
+func (c *vendorSnapshotSingleton) GenerateBuildActions(ctx android.SingletonContext) {
+	// BOARD_VNDK_VERSION must be set to 'current' in order to generate a vendor snapshot.
+	if ctx.DeviceConfig().VndkVersion() != "current" {
+		return
+	}
+
+	var snapshotOutputs android.Paths
+
+	/*
+		Vendor snapshot zipped artifacts directory structure:
+		{SNAPSHOT_ARCH}/
+			arch-{TARGET_ARCH}-{TARGET_ARCH_VARIANT}/
+				shared/
+					(.so shared libraries)
+				static/
+					(.a static libraries)
+				header/
+					(header only libraries)
+				binary/
+					(executable binaries)
+			arch-{TARGET_2ND_ARCH}-{TARGET_2ND_ARCH_VARIANT}/
+				shared/
+					(.so shared libraries)
+				static/
+					(.a static libraries)
+				header/
+					(header only libraries)
+				binary/
+					(executable binaries)
+			NOTICE_FILES/
+				(notice files, e.g. libbase.txt)
+			configs/
+				(config files, e.g. init.rc files, vintf_fragments.xml files, etc.)
+			include/
+				(header files of same directory structure with source tree)
+	*/
+
+	snapshotDir := "vendor-snapshot"
+	snapshotArchDir := filepath.Join(snapshotDir, ctx.DeviceConfig().DeviceArch())
+
+	includeDir := filepath.Join(snapshotArchDir, "include")
+	configsDir := filepath.Join(snapshotArchDir, "configs")
+	noticeDir := filepath.Join(snapshotArchDir, "NOTICE_FILES")
+
+	installedNotices := make(map[string]bool)
+	installedConfigs := make(map[string]bool)
+
+	var headers android.Paths
+
+	type vendorSnapshotLibraryInterface interface {
+		exportedFlagsProducer
+		libraryInterface
+	}
+
+	var _ vendorSnapshotLibraryInterface = (*prebuiltLibraryLinker)(nil)
+	var _ vendorSnapshotLibraryInterface = (*libraryDecorator)(nil)
+
+	installSnapshot := func(m *Module) android.Paths {
+		targetArch := "arch-" + m.Target().Arch.ArchType.String()
+		if m.Target().Arch.ArchVariant != "" {
+			targetArch += "-" + m.Target().Arch.ArchVariant
+		}
+
+		var ret android.Paths
+
+		prop := struct {
+			ModuleName          string `json:",omitempty"`
+			RelativeInstallPath string `json:",omitempty"`
+
+			// library flags
+			ExportedDirs       []string `json:",omitempty"`
+			ExportedSystemDirs []string `json:",omitempty"`
+			ExportedFlags      []string `json:",omitempty"`
+			SanitizeMinimalDep bool     `json:",omitempty"`
+			SanitizeUbsanDep   bool     `json:",omitempty"`
+
+			// binary flags
+			Symlinks []string `json:",omitempty"`
+
+			// dependencies
+			SharedLibs  []string `json:",omitempty"`
+			RuntimeLibs []string `json:",omitempty"`
+			Required    []string `json:",omitempty"`
+
+			// extra config files
+			InitRc         []string `json:",omitempty"`
+			VintfFragments []string `json:",omitempty"`
+		}{}
+
+		// Common properties among snapshots.
+		prop.ModuleName = ctx.ModuleName(m)
+		prop.RelativeInstallPath = m.RelativeInstallPath()
+		prop.RuntimeLibs = m.Properties.SnapshotRuntimeLibs
+		prop.Required = m.RequiredModuleNames()
+		for _, path := range m.InitRc() {
+			prop.InitRc = append(prop.InitRc, filepath.Join("configs", path.Base()))
+		}
+		for _, path := range m.VintfFragments() {
+			prop.VintfFragments = append(prop.VintfFragments, filepath.Join("configs", path.Base()))
+		}
+
+		// install config files. ignores any duplicates.
+		for _, path := range append(m.InitRc(), m.VintfFragments()...) {
+			out := filepath.Join(configsDir, path.Base())
+			if !installedConfigs[out] {
+				installedConfigs[out] = true
+				ret = append(ret, copyFile(ctx, path, out))
+			}
+		}
+
+		var propOut string
+
+		if l, ok := m.linker.(vendorSnapshotLibraryInterface); ok {
+			// library flags
+			prop.ExportedFlags = l.exportedFlags()
+			for _, dir := range l.exportedDirs() {
+				prop.ExportedDirs = append(prop.ExportedDirs, filepath.Join("include", dir.String()))
+			}
+			for _, dir := range l.exportedSystemDirs() {
+				prop.ExportedSystemDirs = append(prop.ExportedSystemDirs, filepath.Join("include", dir.String()))
+			}
+			// shared libs dependencies aren't meaningful on static or header libs
+			if l.shared() {
+				prop.SharedLibs = m.Properties.SnapshotSharedLibs
+			}
+			if l.static() && m.sanitize != nil {
+				prop.SanitizeMinimalDep = m.sanitize.Properties.MinimalRuntimeDep || enableMinimalRuntime(m.sanitize)
+				prop.SanitizeUbsanDep = m.sanitize.Properties.UbsanRuntimeDep || enableUbsanRuntime(m.sanitize)
+			}
+
+			var libType string
+			if l.static() {
+				libType = "static"
+			} else if l.shared() {
+				libType = "shared"
+			} else {
+				libType = "header"
+			}
+
+			var stem string
+
+			// install .a or .so
+			if libType != "header" {
+				libPath := m.outputFile.Path()
+				stem = libPath.Base()
+				snapshotLibOut := filepath.Join(snapshotArchDir, targetArch, libType, stem)
+				ret = append(ret, copyFile(ctx, libPath, snapshotLibOut))
+			} else {
+				stem = ctx.ModuleName(m)
+			}
+
+			propOut = filepath.Join(snapshotArchDir, targetArch, libType, stem+".json")
+		} else {
+			// binary flags
+			prop.Symlinks = m.Symlinks()
+			prop.SharedLibs = m.Properties.SnapshotSharedLibs
+
+			// install bin
+			binPath := m.outputFile.Path()
+			snapshotBinOut := filepath.Join(snapshotArchDir, targetArch, "binary", binPath.Base())
+			ret = append(ret, copyFile(ctx, binPath, snapshotBinOut))
+			propOut = snapshotBinOut + ".json"
+		}
+
+		j, err := json.Marshal(prop)
+		if err != nil {
+			ctx.Errorf("json marshal to %q failed: %#v", propOut, err)
+			return nil
+		}
+		ret = append(ret, writeStringToFile(ctx, string(j), propOut))
+
+		return ret
+	}
+
+	ctx.VisitAllModules(func(module android.Module) {
+		m, ok := module.(*Module)
+		if !ok || !isVendorSnapshotModule(ctx, m) {
+			return
+		}
+
+		snapshotOutputs = append(snapshotOutputs, installSnapshot(m)...)
+		if l, ok := m.linker.(vendorSnapshotLibraryInterface); ok {
+			headers = append(headers, exportedHeaders(ctx, l)...)
+		}
+
+		if m.NoticeFile().Valid() {
+			noticeName := ctx.ModuleName(m) + ".txt"
+			noticeOut := filepath.Join(noticeDir, noticeName)
+			// skip already copied notice file
+			if !installedNotices[noticeOut] {
+				installedNotices[noticeOut] = true
+				snapshotOutputs = append(snapshotOutputs, copyFile(
+					ctx, m.NoticeFile().Path(), noticeOut))
+			}
+		}
+	})
+
+	// install all headers after removing duplicates
+	for _, header := range android.FirstUniquePaths(headers) {
+		snapshotOutputs = append(snapshotOutputs, copyFile(
+			ctx, header, filepath.Join(includeDir, header.String())))
+	}
+
+	// All artifacts are ready. Sort them to normalize ninja and then zip.
+	sort.Slice(snapshotOutputs, func(i, j int) bool {
+		return snapshotOutputs[i].String() < snapshotOutputs[j].String()
+	})
+
+	zipPath := android.PathForOutput(ctx, snapshotDir, "vendor-"+ctx.Config().DeviceName()+".zip")
+	zipRule := android.NewRuleBuilder()
+
+	// filenames in rspfile from FlagWithRspFileInputList might be single-quoted. Remove it with tr
+	snapshotOutputList := android.PathForOutput(ctx, snapshotDir, "vendor-"+ctx.Config().DeviceName()+"_list")
+	zipRule.Command().
+		Text("tr").
+		FlagWithArg("-d ", "\\'").
+		FlagWithRspFileInputList("< ", snapshotOutputs).
+		FlagWithOutput("> ", snapshotOutputList)
+
+	zipRule.Temporary(snapshotOutputList)
+
+	zipRule.Command().
+		BuiltTool(ctx, "soong_zip").
+		FlagWithOutput("-o ", zipPath).
+		FlagWithArg("-C ", android.PathForOutput(ctx, snapshotDir).String()).
+		FlagWithInput("-l ", snapshotOutputList)
+
+	zipRule.Build(pctx, ctx, zipPath.String(), "vendor snapshot "+zipPath.String())
+	zipRule.DeleteTemporaryFiles()
+	c.vendorSnapshotZipFile = android.OptionalPathForPath(zipPath)
+}
+
+func (c *vendorSnapshotSingleton) MakeVars(ctx android.MakeVarsContext) {
+	ctx.Strict("SOONG_VENDOR_SNAPSHOT_ZIP", c.vendorSnapshotZipFile.String())
+}
+
+type snapshotInterface interface {
+	matchesWithDevice(config android.DeviceConfig) bool
+}
+
+var _ snapshotInterface = (*vndkPrebuiltLibraryDecorator)(nil)
+var _ snapshotInterface = (*vendorSnapshotLibraryDecorator)(nil)
+var _ snapshotInterface = (*vendorSnapshotBinaryDecorator)(nil)
+
+// gathers all snapshot modules for vendor, and disable unnecessary snapshots
+// 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
+	}
+
+	snapshot, ok := module.linker.(snapshotInterface)
+	if !ok {
+		return
+	}
+
+	if !snapshot.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.(*vendorSnapshotBinaryDecorator); ok {
+		snapshotMap = vendorSnapshotBinaries(ctx.Config())
+	} else {
+		return
+	}
+
+	vendorSnapshotsLock.Lock()
+	defer vendorSnapshotsLock.Unlock()
+	snapshotMap.add(module.BaseModuleName(), ctx.Arch().ArchType, ctx.ModuleName())
+}
+
+// Disables source modules which have snapshots
+func VendorSnapshotSourceMutator(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 {
+		return
+	}
+
+	if module.HasVendorVariant() {
+		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
+	}
+
+	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.(*binaryDecorator); ok {
+		snapshotMap = vendorSnapshotBinaries(ctx.Config())
+	} else if _, ok := module.linker.(*prebuiltBinaryLinker); ok {
+		snapshotMap = vendorSnapshotBinaries(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()
+	}
+}
diff --git a/cc/vndk.go b/cc/vndk.go
index ab73035..4578a7d 100644
--- a/cc/vndk.go
+++ b/cc/vndk.go
@@ -229,8 +229,6 @@
 	vndkUsingCoreVariantLibrariesKey = android.NewOnceKey("vndkUsingCoreVariantLibraries")
 	vndkMustUseVendorVariantListKey  = android.NewOnceKey("vndkMustUseVendorVariantListKey")
 	vndkLibrariesLock                sync.Mutex
-
-	headerExts = []string{".h", ".hh", ".hpp", ".hxx", ".h++", ".inl", ".inc", ".ipp", ".h.generic"}
 )
 
 func vndkCoreLibraries(config android.Config) map[string]string {
@@ -548,29 +546,10 @@
 	snapshotDir := "vndk-snapshot"
 	snapshotArchDir := filepath.Join(snapshotDir, ctx.DeviceConfig().DeviceArch())
 
-	targetArchDirMap := make(map[android.ArchType]string)
-	for _, target := range ctx.Config().Targets[android.Android] {
-		dir := snapshotArchDir
-		if ctx.DeviceConfig().BinderBitness() == "32" {
-			dir = filepath.Join(dir, "binder32")
-		}
-		arch := "arch-" + target.Arch.ArchType.String()
-		if target.Arch.ArchVariant != "" {
-			arch += "-" + target.Arch.ArchVariant
-		}
-		dir = filepath.Join(dir, arch)
-		targetArchDirMap[target.Arch.ArchType] = dir
-	}
 	configsDir := filepath.Join(snapshotArchDir, "configs")
 	noticeDir := filepath.Join(snapshotArchDir, "NOTICE_FILES")
 	includeDir := filepath.Join(snapshotArchDir, "include")
 
-	// set of include paths exported by VNDK libraries
-	exportedIncludes := make(map[string]bool)
-
-	// generated header files among exported headers.
-	var generatedHeaders android.Paths
-
 	// set of notice files copied.
 	noticeBuilt := make(map[string]bool)
 
@@ -581,67 +560,20 @@
 	// e.g. moduleNames["libprotobuf-cpp-full-3.9.1.so"] = "libprotobuf-cpp-full"
 	moduleNames := make(map[string]string)
 
-	installSnapshotFileFromPath := func(path android.Path, out string) android.OutputPath {
-		outPath := android.PathForOutput(ctx, out)
-		ctx.Build(pctx, android.BuildParams{
-			Rule:        android.Cp,
-			Input:       path,
-			Output:      outPath,
-			Description: "vndk snapshot " + out,
-			Args: map[string]string{
-				"cpFlags": "-f -L",
-			},
-		})
-		return outPath
-	}
+	var headers android.Paths
 
-	installSnapshotFileFromContent := func(content, out string) android.OutputPath {
-		outPath := android.PathForOutput(ctx, out)
-		ctx.Build(pctx, android.BuildParams{
-			Rule:        android.WriteFile,
-			Output:      outPath,
-			Description: "vndk snapshot " + out,
-			Args: map[string]string{
-				"content": content,
-			},
-		})
-		return outPath
-	}
-
-	type vndkSnapshotLibraryInterface interface {
-		exportedFlagsProducer
-		libraryInterface
-	}
-
-	var _ vndkSnapshotLibraryInterface = (*prebuiltLibraryLinker)(nil)
-	var _ vndkSnapshotLibraryInterface = (*libraryDecorator)(nil)
-
-	installVndkSnapshotLib := func(m *Module, l vndkSnapshotLibraryInterface, vndkType string) (android.Paths, bool) {
-		targetArchDir, ok := targetArchDirMap[m.Target().Arch.ArchType]
-		if !ok {
-			return nil, false
-		}
-
+	installVndkSnapshotLib := func(m *Module, l snapshotLibraryInterface, vndkType string) (android.Paths, bool) {
 		var ret android.Paths
 
-		libPath := m.outputFile.Path()
-		stem := libPath.Base()
-		snapshotLibOut := filepath.Join(targetArchDir, "shared", vndkType, stem)
-		ret = append(ret, installSnapshotFileFromPath(libPath, snapshotLibOut))
-
-		moduleNames[stem] = ctx.ModuleName(m)
-		modulePaths[stem] = ctx.ModuleDir(m)
-
-		if m.NoticeFile().Valid() {
-			noticeName := stem + ".txt"
-			// skip already copied notice file
-			if _, ok := noticeBuilt[noticeName]; !ok {
-				noticeBuilt[noticeName] = true
-				ret = append(ret, installSnapshotFileFromPath(
-					m.NoticeFile().Path(), filepath.Join(noticeDir, noticeName)))
-			}
+		targetArch := "arch-" + m.Target().Arch.ArchType.String()
+		if m.Target().Arch.ArchVariant != "" {
+			targetArch += "-" + m.Target().Arch.ArchVariant
 		}
 
+		libPath := m.outputFile.Path()
+		snapshotLibOut := filepath.Join(snapshotArchDir, targetArch, "shared", vndkType, libPath.Base())
+		ret = append(ret, copyFile(ctx, libPath, snapshotLibOut))
+
 		if ctx.Config().VndkSnapshotBuildArtifacts() {
 			prop := struct {
 				ExportedDirs        []string `json:",omitempty"`
@@ -661,19 +593,19 @@
 				ctx.Errorf("json marshal to %q failed: %#v", propOut, err)
 				return nil, false
 			}
-			ret = append(ret, installSnapshotFileFromContent(string(j), propOut))
+			ret = append(ret, writeStringToFile(ctx, string(j), propOut))
 		}
 		return ret, true
 	}
 
-	isVndkSnapshotLibrary := func(m *Module) (i vndkSnapshotLibraryInterface, vndkType string, isVndkSnapshotLib bool) {
+	isVndkSnapshotLibrary := func(m *Module) (i snapshotLibraryInterface, vndkType string, isVndkSnapshotLib bool) {
 		if m.Target().NativeBridge == android.NativeBridgeEnabled {
 			return nil, "", false
 		}
-		if !m.UseVndk() || !m.installable() || !m.inVendor() {
+		if !m.inVendor() || !m.installable() || m.isSnapshotPrebuilt() {
 			return nil, "", false
 		}
-		l, ok := m.linker.(vndkSnapshotLibraryInterface)
+		l, ok := m.linker.(snapshotLibraryInterface)
 		if !ok || !l.shared() {
 			return nil, "", false
 		}
@@ -699,75 +631,38 @@
 			return
 		}
 
+		// install .so files for appropriate modules.
+		// Also install .json files if VNDK_SNAPSHOT_BUILD_ARTIFACTS
 		libs, ok := installVndkSnapshotLib(m, l, vndkType)
 		if !ok {
 			return
 		}
-
 		snapshotOutputs = append(snapshotOutputs, libs...)
 
-		// We glob headers from include directories inside source tree. So we first gather
-		// all include directories inside our source tree. On the contrast, we manually
-		// collect generated headers from dependencies as they can't globbed.
-		generatedHeaders = append(generatedHeaders, l.exportedGeneratedHeaders()...)
-		for _, dir := range append(l.exportedDirs(), l.exportedSystemDirs()...) {
-			exportedIncludes[dir.String()] = true
+		// These are for generating module_names.txt and module_paths.txt
+		stem := m.outputFile.Path().Base()
+		moduleNames[stem] = ctx.ModuleName(m)
+		modulePaths[stem] = ctx.ModuleDir(m)
+
+		if m.NoticeFile().Valid() {
+			noticeName := stem + ".txt"
+			// skip already copied notice file
+			if _, ok := noticeBuilt[noticeName]; !ok {
+				noticeBuilt[noticeName] = true
+				snapshotOutputs = append(snapshotOutputs, copyFile(
+					ctx, m.NoticeFile().Path(), filepath.Join(noticeDir, noticeName)))
+			}
+		}
+
+		if ctx.Config().VndkSnapshotBuildArtifacts() {
+			headers = append(headers, exportedHeaders(ctx, l)...)
 		}
 	})
 
-	if ctx.Config().VndkSnapshotBuildArtifacts() {
-		globbedHeaders := make(map[string]bool)
-
-		for _, dir := range android.SortedStringKeys(exportedIncludes) {
-			// Skip if dir is for generated headers
-			if strings.HasPrefix(dir, android.PathForOutput(ctx).String()) {
-				continue
-			}
-			exts := headerExts
-			// Glob all files under this special directory, because of C++ headers.
-			if strings.HasPrefix(dir, "external/libcxx/include") {
-				exts = []string{""}
-			}
-			for _, ext := range exts {
-				glob, err := ctx.GlobWithDeps(dir+"/**/*"+ext, nil)
-				if err != nil {
-					ctx.Errorf("%#v\n", err)
-					return
-				}
-				for _, header := range glob {
-					if strings.HasSuffix(header, "/") {
-						continue
-					}
-					globbedHeaders[header] = true
-				}
-			}
-		}
-
-		for _, header := range android.SortedStringKeys(globbedHeaders) {
-			snapshotOutputs = append(snapshotOutputs, installSnapshotFileFromPath(
-				android.PathForSource(ctx, header), filepath.Join(includeDir, header)))
-		}
-
-		isHeader := func(path string) bool {
-			for _, ext := range headerExts {
-				if strings.HasSuffix(path, ext) {
-					return true
-				}
-			}
-			return false
-		}
-
-		// For generated headers, manually install one by one, rather than glob
-		for _, path := range android.PathsToDirectorySortedPaths(android.FirstUniquePaths(generatedHeaders)) {
-			header := path.String()
-
-			if !isHeader(header) {
-				continue
-			}
-
-			snapshotOutputs = append(snapshotOutputs, installSnapshotFileFromPath(
-				path, filepath.Join(includeDir, header)))
-		}
+	// install all headers after removing duplicates
+	for _, header := range android.FirstUniquePaths(headers) {
+		snapshotOutputs = append(snapshotOutputs, copyFile(
+			ctx, header, filepath.Join(includeDir, header.String())))
 	}
 
 	// install *.libraries.txt except vndkcorevariant.libraries.txt
@@ -776,7 +671,8 @@
 		if !ok || !m.Enabled() || m.Name() == vndkUsingCoreVariantLibrariesTxt {
 			return
 		}
-		snapshotOutputs = append(snapshotOutputs, installSnapshotFileFromPath(m.OutputFile(), filepath.Join(configsDir, m.Name())))
+		snapshotOutputs = append(snapshotOutputs, copyFile(
+			ctx, m.OutputFile(), filepath.Join(configsDir, m.Name())))
 	})
 
 	/*
@@ -796,7 +692,7 @@
 			txtBuilder.WriteString(" ")
 			txtBuilder.WriteString(m[k])
 		}
-		return installSnapshotFileFromContent(txtBuilder.String(), path)
+		return writeStringToFile(ctx, txtBuilder.String(), path)
 	}
 
 	/*
@@ -827,14 +723,13 @@
 	zipPath := android.PathForOutput(ctx, snapshotDir, "android-vndk-"+ctx.DeviceConfig().DeviceArch()+".zip")
 	zipRule := android.NewRuleBuilder()
 
-	// If output files are too many, soong_zip command can exceed ARG_MAX.
-	// So first dump file lists into a single list file, and then feed it to Soong
+	// filenames in rspfile from FlagWithRspFileInputList might be single-quoted. Remove it with xargs
 	snapshotOutputList := android.PathForOutput(ctx, snapshotDir, "android-vndk-"+ctx.DeviceConfig().DeviceArch()+"_list")
 	zipRule.Command().
-		Text("( xargs").
-		FlagWithRspFileInputList("-n1 echo < ", snapshotOutputs).
-		FlagWithOutput("| tr -d \\' > ", snapshotOutputList).
-		Text(")")
+		Text("tr").
+		FlagWithArg("-d ", "\\'").
+		FlagWithRspFileInputList("< ", snapshotOutputs).
+		FlagWithOutput("> ", snapshotOutputList)
 
 	zipRule.Temporary(snapshotOutputList)
 
@@ -845,6 +740,7 @@
 		FlagWithInput("-l ", snapshotOutputList)
 
 	zipRule.Build(pctx, ctx, zipPath.String(), "vndk snapshot "+zipPath.String())
+	zipRule.DeleteTemporaryFiles()
 	c.vndkSnapshotZipFile = android.OptionalPathForPath(zipPath)
 }
 
diff --git a/cc/vndk_prebuilt.go b/cc/vndk_prebuilt.go
index c941c46..50bc325 100644
--- a/cc/vndk_prebuilt.go
+++ b/cc/vndk_prebuilt.go
@@ -31,7 +31,8 @@
 //
 // vndk_prebuilt_shared {
 //     name: "libfoo",
-//     version: "27.1.0",
+//     version: "27",
+//     target_arch: "arm64",
 //     vendor_available: true,
 //     vndk: {
 //         enabled: true,
@@ -61,10 +62,6 @@
 	// Prebuilt files for each arch.
 	Srcs []string `android:"arch_variant"`
 
-	// list of directories relative to the Blueprints file that will be added to the include
-	// path (using -isystem) for any module that links against this module.
-	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"`
 
@@ -137,11 +134,26 @@
 
 	if len(p.properties.Srcs) > 0 && p.shared() {
 		p.libraryDecorator.exportIncludes(ctx)
-		p.libraryDecorator.reexportSystemDirs(
-			android.PathsForModuleSrc(ctx, p.properties.Export_system_include_dirs)...)
 		p.libraryDecorator.reexportFlags(p.properties.Export_flags...)
 		// current VNDK prebuilts are only shared libs.
-		return p.singleSourcePath(ctx)
+
+		in := p.singleSourcePath(ctx)
+		builderFlags := flagsToBuilderFlags(flags)
+		p.unstrippedOutputFile = in
+		libName := in.Base()
+		if p.needsStrip(ctx) {
+			stripped := android.PathForModuleOut(ctx, "stripped", libName)
+			p.stripExecutableOrSharedLib(ctx, in, stripped, builderFlags)
+			in = stripped
+		}
+
+		// 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)
+
+		return in
 	}
 
 	ctx.Module().SkipInstall()
@@ -212,6 +224,15 @@
 		&prebuilt.properties,
 	)
 
+	android.AddLoadHook(module, func(ctx android.LoadHookContext) {
+		// Only vndk snapshots of BOARD_VNDK_VERSION will be used when building.
+		if prebuilt.version() != ctx.DeviceConfig().VndkVersion() {
+			module.SkipInstall()
+			module.Properties.HideFromMake = true
+			return
+		}
+	})
+
 	return module
 }
 
@@ -220,7 +241,8 @@
 //
 //    vndk_prebuilt_shared {
 //        name: "libfoo",
-//        version: "27.1.0",
+//        version: "27",
+//        target_arch: "arm64",
 //        vendor_available: true,
 //        vndk: {
 //            enabled: true,
diff --git a/cc/xom.go b/cc/xom.go
deleted file mode 100644
index ce817aa..0000000
--- a/cc/xom.go
+++ /dev/null
@@ -1,79 +0,0 @@
-// Copyright 2018 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
-
-import (
-	"android/soong/android"
-)
-
-type XomProperties struct {
-	Xom *bool
-}
-
-type xom struct {
-	Properties XomProperties
-}
-
-func (xom *xom) props() []interface{} {
-	return []interface{}{&xom.Properties}
-}
-
-func (xom *xom) begin(ctx BaseModuleContext) {}
-
-func (xom *xom) deps(ctx BaseModuleContext, deps Deps) Deps {
-	return deps
-}
-
-func (xom *xom) flags(ctx ModuleContext, flags Flags) Flags {
-	disableXom := false
-
-	if !ctx.Config().EnableXOM() || ctx.Config().XOMDisabledForPath(ctx.ModuleDir()) {
-		disableXom = true
-	}
-
-	if xom.Properties.Xom != nil && !*xom.Properties.Xom {
-		return flags
-	}
-
-	// If any static dependencies have XOM disabled, we should disable XOM in this module,
-	// the assumption being if it's been explicitly disabled then there's probably incompatible
-	// code in the library which may get pulled in.
-	if !disableXom {
-		ctx.VisitDirectDeps(func(m android.Module) {
-			cc, ok := m.(*Module)
-			if !ok || cc.xom == nil || !cc.static() {
-				return
-			}
-			if cc.xom.Properties.Xom != nil && !*cc.xom.Properties.Xom {
-				disableXom = true
-				return
-			}
-		})
-	}
-
-	// Enable execute-only if none of the dependencies disable it,
-	// also if it's explicitly set true (allows overriding dependencies disabling it).
-	if !disableXom || (xom.Properties.Xom != nil && *xom.Properties.Xom) {
-		// XOM is only supported on AArch64 when using lld.
-		if ctx.Arch().ArchType == android.Arm64 && ctx.useClangLld(ctx) {
-			flags.Local.LdFlags = append(flags.Local.LdFlags,
-				"-Wl,--execute-only",
-				"-Wl,-z,separate-code",
-			)
-		}
-	}
-
-	return flags
-}
diff --git a/dexpreopt/Android.bp b/dexpreopt/Android.bp
index c5f24e2..b8f7ea6 100644
--- a/dexpreopt/Android.bp
+++ b/dexpreopt/Android.bp
@@ -4,6 +4,7 @@
     srcs: [
         "config.go",
         "dexpreopt.go",
+        "testing.go",
     ],
     testSrcs: [
         "dexpreopt_test.go",
diff --git a/dexpreopt/config.go b/dexpreopt/config.go
index 720f79e..98850e5 100644
--- a/dexpreopt/config.go
+++ b/dexpreopt/config.go
@@ -16,14 +16,16 @@
 
 import (
 	"encoding/json"
+	"fmt"
 	"strings"
 
+	"github.com/google/blueprint"
+
 	"android/soong/android"
 )
 
 // GlobalConfig stores the configuration for dex preopting. The fields are set
-// from product variables via dex_preopt_config.mk, except for SoongConfig
-// which come from CreateGlobalSoongConfig.
+// from product variables via dex_preopt_config.mk.
 type GlobalConfig struct {
 	DisablePreopt        bool     // disable preopt for all modules
 	DisablePreoptModules []string // modules with preopt disabled by product-specific config
@@ -32,9 +34,6 @@
 
 	UseArtImage bool // use the art image (use other boot class path dex files without image)
 
-	GenerateApexImage bool // generate an extra boot image only containing jars from the runtime apex
-	UseApexImage      bool // use the apex image by default
-
 	HasSystemOther        bool     // store odex files that match PatternsOnSystemOther on the system_other partition
 	PatternsOnSystemOther []string // patterns (using '%' to denote a prefix match) to put odex on the system_other partition
 
@@ -84,8 +83,6 @@
 	BootFlags         string               // extra flags to pass to dex2oat for the boot image
 	Dex2oatImageXmx   string               // max heap size for dex2oat for the boot image
 	Dex2oatImageXms   string               // initial heap size for dex2oat for the boot image
-
-	SoongConfig GlobalSoongConfig // settings read from dexpreopt_soong.config
 }
 
 // GlobalSoongConfig contains the global config that is generated from Soong,
@@ -181,14 +178,11 @@
 	return constructPath(ctx, path).(android.WritablePath)
 }
 
-// LoadGlobalConfig reads the global dexpreopt.config file into a GlobalConfig
-// struct, except the SoongConfig field which is set from the provided
-// soongConfig argument. LoadGlobalConfig is used directly in Soong and in
-// dexpreopt_gen called from Make to read the $OUT/dexpreopt.config written by
-// Make.
-func LoadGlobalConfig(ctx android.PathContext, data []byte, soongConfig GlobalSoongConfig) (GlobalConfig, error) {
+// ParseGlobalConfig parses the given data assumed to be read from the global
+// dexpreopt.config file into a GlobalConfig struct.
+func ParseGlobalConfig(ctx android.PathContext, data []byte) (*GlobalConfig, error) {
 	type GlobalJSONConfig struct {
-		GlobalConfig
+		*GlobalConfig
 
 		// Copies of entries in GlobalConfig that are not constructable without extra parameters.  They will be
 		// used to construct the real value manually below.
@@ -206,19 +200,70 @@
 	config.GlobalConfig.DirtyImageObjects = android.OptionalPathForPath(constructPath(ctx, config.DirtyImageObjects))
 	config.GlobalConfig.BootImageProfiles = constructPaths(ctx, config.BootImageProfiles)
 
-	// Set this here to force the caller to provide a value for this struct (from
-	// either CreateGlobalSoongConfig or LoadGlobalSoongConfig).
-	config.GlobalConfig.SoongConfig = soongConfig
-
 	return config.GlobalConfig, nil
 }
 
-// LoadModuleConfig reads a per-module dexpreopt.config file into a ModuleConfig struct.  It is not used in Soong, which
-// receives a ModuleConfig struct directly from java/dexpreopt.go.  It is used in dexpreopt_gen called from oMake to
-// read the module dexpreopt.config written by Make.
-func LoadModuleConfig(ctx android.PathContext, data []byte) (ModuleConfig, error) {
+type globalConfigAndRaw struct {
+	global *GlobalConfig
+	data   []byte
+}
+
+// GetGlobalConfig returns the global dexpreopt.config that's created in the
+// make config phase. It is loaded once the first time it is called for any
+// ctx.Config(), and returns the same data for all future calls with the same
+// ctx.Config(). A value can be inserted for tests using
+// setDexpreoptTestGlobalConfig.
+func GetGlobalConfig(ctx android.PathContext) *GlobalConfig {
+	return getGlobalConfigRaw(ctx).global
+}
+
+// GetGlobalConfigRawData is the same as GetGlobalConfig, except that it returns
+// the literal content of dexpreopt.config.
+func GetGlobalConfigRawData(ctx android.PathContext) []byte {
+	return getGlobalConfigRaw(ctx).data
+}
+
+var globalConfigOnceKey = android.NewOnceKey("DexpreoptGlobalConfig")
+var testGlobalConfigOnceKey = android.NewOnceKey("TestDexpreoptGlobalConfig")
+
+func getGlobalConfigRaw(ctx android.PathContext) globalConfigAndRaw {
+	return ctx.Config().Once(globalConfigOnceKey, func() interface{} {
+		if data, err := ctx.Config().DexpreoptGlobalConfig(ctx); err != nil {
+			panic(err)
+		} else if data != nil {
+			globalConfig, err := ParseGlobalConfig(ctx, data)
+			if err != nil {
+				panic(err)
+			}
+			return globalConfigAndRaw{globalConfig, data}
+		}
+
+		// No global config filename set, see if there is a test config set
+		return ctx.Config().Once(testGlobalConfigOnceKey, func() interface{} {
+			// Nope, return a config with preopting disabled
+			return globalConfigAndRaw{&GlobalConfig{
+				DisablePreopt:          true,
+				DisableGenerateProfile: true,
+			}, nil}
+		})
+	}).(globalConfigAndRaw)
+}
+
+// SetTestGlobalConfig sets a GlobalConfig that future calls to GetGlobalConfig
+// will return. It must be called before the first call to GetGlobalConfig for
+// the config.
+func SetTestGlobalConfig(config android.Config, globalConfig *GlobalConfig) {
+	config.Once(testGlobalConfigOnceKey, func() interface{} { return globalConfigAndRaw{globalConfig, nil} })
+}
+
+// ParseModuleConfig parses a per-module dexpreopt.config file into a
+// ModuleConfig struct. It is not used in Soong, which receives a ModuleConfig
+// struct directly from java/dexpreopt.go. It is used in dexpreopt_gen called
+// from Make to read the module dexpreopt.config written in the Make config
+// stage.
+func ParseModuleConfig(ctx android.PathContext, data []byte) (*ModuleConfig, error) {
 	type ModuleJSONConfig struct {
-		ModuleConfig
+		*ModuleConfig
 
 		// Copies of entries in ModuleConfig that are not constructable without extra parameters.  They will be
 		// used to construct the real value manually below.
@@ -255,21 +300,63 @@
 	return config.ModuleConfig, nil
 }
 
-// CreateGlobalSoongConfig creates a GlobalSoongConfig from the current context.
-// Should not be used in dexpreopt_gen.
-func CreateGlobalSoongConfig(ctx android.PathContext) GlobalSoongConfig {
-	// Default to debug version to help find bugs.
+// dex2oatModuleName returns the name of the module to use for the dex2oat host
+// tool. It should be a binary module with public visibility that is compiled
+// and installed for host.
+func dex2oatModuleName(config android.Config) string {
+	// Default to the debug variant of dex2oat to help find bugs.
 	// Set USE_DEX2OAT_DEBUG to false for only building non-debug versions.
-	var dex2oatBinary string
-	if ctx.Config().Getenv("USE_DEX2OAT_DEBUG") == "false" {
-		dex2oatBinary = "dex2oat"
+	if config.Getenv("USE_DEX2OAT_DEBUG") == "false" {
+		return "dex2oat"
 	} else {
-		dex2oatBinary = "dex2oatd"
+		return "dex2oatd"
+	}
+}
+
+var dex2oatDepTag = struct {
+	blueprint.BaseDependencyTag
+}{}
+
+// RegisterToolDeps adds the necessary dependencies to binary modules for tools
+// that are required later when Get(Cached)GlobalSoongConfig is called. It
+// should be called from a mutator that's registered with
+// android.RegistrationContext.FinalDepsMutators.
+func RegisterToolDeps(ctx android.BottomUpMutatorContext) {
+	dex2oatBin := dex2oatModuleName(ctx.Config())
+	v := ctx.Config().BuildOSTarget.Variations()
+	ctx.AddFarVariationDependencies(v, dex2oatDepTag, dex2oatBin)
+}
+
+func dex2oatPathFromDep(ctx android.ModuleContext) android.Path {
+	dex2oatBin := dex2oatModuleName(ctx.Config())
+
+	dex2oatModule := ctx.GetDirectDepWithTag(dex2oatBin, dex2oatDepTag)
+	if dex2oatModule == nil {
+		// If this happens there's probably a missing call to AddToolDeps in DepsMutator.
+		panic(fmt.Sprintf("Failed to lookup %s dependency", dex2oatBin))
 	}
 
-	return GlobalSoongConfig{
+	dex2oatPath := dex2oatModule.(android.HostToolProvider).HostToolPath()
+	if !dex2oatPath.Valid() {
+		panic(fmt.Sprintf("Failed to find host tool path in %s", dex2oatModule))
+	}
+
+	return dex2oatPath.Path()
+}
+
+// createGlobalSoongConfig creates a GlobalSoongConfig from the current context.
+// Should not be used in dexpreopt_gen.
+func createGlobalSoongConfig(ctx android.ModuleContext) *GlobalSoongConfig {
+	if ctx.Config().TestProductVariables != nil {
+		// If we're called in a test there'll be a confusing error from the path
+		// functions below that gets reported without a stack trace, so let's panic
+		// properly with a more helpful message.
+		panic("This should not be called from tests. Please call GlobalSoongConfigForTests somewhere in the test setup.")
+	}
+
+	return &GlobalSoongConfig{
 		Profman:          ctx.Config().HostToolPath(ctx, "profman"),
-		Dex2oat:          ctx.Config().HostToolPath(ctx, dex2oatBinary),
+		Dex2oat:          dex2oatPathFromDep(ctx),
 		Aapt:             ctx.Config().HostToolPath(ctx, "aapt"),
 		SoongZip:         ctx.Config().HostToolPath(ctx, "soong_zip"),
 		Zip2zip:          ctx.Config().HostToolPath(ctx, "zip2zip"),
@@ -278,6 +365,47 @@
 	}
 }
 
+// The main reason for this Once cache for GlobalSoongConfig is to make the
+// dex2oat path available to singletons. In ordinary modules we get it through a
+// dex2oatDepTag dependency, but in singletons there's no simple way to do the
+// same thing and ensure the right variant is selected, hence this cache to make
+// the resolved path available to singletons. This means we depend on there
+// being at least one ordinary module with a dex2oatDepTag dependency.
+//
+// TODO(b/147613152): Implement a way to deal with dependencies from singletons,
+// and then possibly remove this cache altogether (but the use in
+// GlobalSoongConfigForTests also needs to be rethought).
+var globalSoongConfigOnceKey = android.NewOnceKey("DexpreoptGlobalSoongConfig")
+
+// GetGlobalSoongConfig creates a GlobalSoongConfig the first time it's called,
+// and later returns the same cached instance.
+func GetGlobalSoongConfig(ctx android.ModuleContext) *GlobalSoongConfig {
+	globalSoong := ctx.Config().Once(globalSoongConfigOnceKey, func() interface{} {
+		return createGlobalSoongConfig(ctx)
+	}).(*GlobalSoongConfig)
+
+	// Always resolve the tool path from the dependency, to ensure that every
+	// module has the dependency added properly.
+	myDex2oat := dex2oatPathFromDep(ctx)
+	if myDex2oat != globalSoong.Dex2oat {
+		panic(fmt.Sprintf("Inconsistent dex2oat path in cached config: expected %s, got %s", globalSoong.Dex2oat, myDex2oat))
+	}
+
+	return globalSoong
+}
+
+// GetCachedGlobalSoongConfig returns a cached GlobalSoongConfig created by an
+// earlier GetGlobalSoongConfig call. This function works with any context
+// compatible with a basic PathContext, since it doesn't try to create a
+// GlobalSoongConfig with the proper paths (which requires a full
+// ModuleContext). If there has been no prior call to GetGlobalSoongConfig, nil
+// is returned.
+func GetCachedGlobalSoongConfig(ctx android.PathContext) *GlobalSoongConfig {
+	return ctx.Config().Once(globalSoongConfigOnceKey, func() interface{} {
+		return (*GlobalSoongConfig)(nil)
+	}).(*GlobalSoongConfig)
+}
+
 type globalJsonSoongConfig struct {
 	Profman          string
 	Dex2oat          string
@@ -288,17 +416,18 @@
 	ConstructContext string
 }
 
-// LoadGlobalSoongConfig reads the dexpreopt_soong.config file into a
-// GlobalSoongConfig struct. It is only used in dexpreopt_gen.
-func LoadGlobalSoongConfig(ctx android.PathContext, data []byte) (GlobalSoongConfig, error) {
+// ParseGlobalSoongConfig parses the given data assumed to be read from the
+// global dexpreopt_soong.config file into a GlobalSoongConfig struct. It is
+// only used in dexpreopt_gen.
+func ParseGlobalSoongConfig(ctx android.PathContext, data []byte) (*GlobalSoongConfig, error) {
 	var jc globalJsonSoongConfig
 
 	err := json.Unmarshal(data, &jc)
 	if err != nil {
-		return GlobalSoongConfig{}, err
+		return &GlobalSoongConfig{}, err
 	}
 
-	config := GlobalSoongConfig{
+	config := &GlobalSoongConfig{
 		Profman:          constructPath(ctx, jc.Profman),
 		Dex2oat:          constructPath(ctx, jc.Dex2oat),
 		Aapt:             constructPath(ctx, jc.Aapt),
@@ -312,7 +441,17 @@
 }
 
 func (s *globalSoongConfigSingleton) GenerateBuildActions(ctx android.SingletonContext) {
-	config := CreateGlobalSoongConfig(ctx)
+	if GetGlobalConfig(ctx).DisablePreopt {
+		return
+	}
+
+	config := GetCachedGlobalSoongConfig(ctx)
+	if config == nil {
+		// No module has enabled dexpreopting, so we assume there will be no calls
+		// to dexpreopt_gen.
+		return
+	}
+
 	jc := globalJsonSoongConfig{
 		Profman:          config.Profman.String(),
 		Dex2oat:          config.Dex2oat.String(),
@@ -339,7 +478,14 @@
 }
 
 func (s *globalSoongConfigSingleton) MakeVars(ctx android.MakeVarsContext) {
-	config := CreateGlobalSoongConfig(ctx)
+	if GetGlobalConfig(ctx).DisablePreopt {
+		return
+	}
+
+	config := GetCachedGlobalSoongConfig(ctx)
+	if config == nil {
+		return
+	}
 
 	ctx.Strict("DEX2OAT", config.Dex2oat.String())
 	ctx.Strict("DEXPREOPT_GEN_DEPS", strings.Join([]string{
@@ -353,8 +499,8 @@
 	}, " "))
 }
 
-func GlobalConfigForTests(ctx android.PathContext) GlobalConfig {
-	return GlobalConfig{
+func GlobalConfigForTests(ctx android.PathContext) *GlobalConfig {
+	return &GlobalConfig{
 		DisablePreopt:                      false,
 		DisablePreoptModules:               nil,
 		OnlyPreoptBootImageAndSystemServer: false,
@@ -392,7 +538,14 @@
 		BootFlags:                          "",
 		Dex2oatImageXmx:                    "",
 		Dex2oatImageXms:                    "",
-		SoongConfig: GlobalSoongConfig{
+	}
+}
+
+func GlobalSoongConfigForTests(config android.Config) *GlobalSoongConfig {
+	// Install the test GlobalSoongConfig in the Once cache so that later calls to
+	// Get(Cached)GlobalSoongConfig returns it without trying to create a real one.
+	return config.Once(globalSoongConfigOnceKey, func() interface{} {
+		return &GlobalSoongConfig{
 			Profman:          android.PathForTesting("profman"),
 			Dex2oat:          android.PathForTesting("dex2oat"),
 			Aapt:             android.PathForTesting("aapt"),
@@ -400,6 +553,6 @@
 			Zip2zip:          android.PathForTesting("zip2zip"),
 			ManifestCheck:    android.PathForTesting("manifest_check"),
 			ConstructContext: android.PathForTesting("construct_context.sh"),
-		},
-	}
+		}
+	}).(*GlobalSoongConfig)
 }
diff --git a/dexpreopt/dexpreopt.go b/dexpreopt/dexpreopt.go
index ac5b691..6cb9873 100644
--- a/dexpreopt/dexpreopt.go
+++ b/dexpreopt/dexpreopt.go
@@ -41,16 +41,25 @@
 
 	"android/soong/android"
 
+	"github.com/google/blueprint"
 	"github.com/google/blueprint/pathtools"
 )
 
 const SystemPartition = "/system/"
 const SystemOtherPartition = "/system_other/"
 
+type dependencyTag struct {
+	blueprint.BaseDependencyTag
+	name string
+}
+
+var SystemServerDepTag = dependencyTag{name: "system-server-dep"}
+var SystemServerForcedDepTag = dependencyTag{name: "system-server-forced-dep"}
+
 // GenerateDexpreoptRule generates a set of commands that will preopt a module based on a GlobalConfig and a
 // ModuleConfig.  The produced files and their install locations will be available through rule.Installs().
-func GenerateDexpreoptRule(ctx android.PathContext,
-	global GlobalConfig, module ModuleConfig) (rule *android.RuleBuilder, err error) {
+func GenerateDexpreoptRule(ctx android.PathContext, globalSoong *GlobalSoongConfig,
+	global *GlobalConfig, module *ModuleConfig) (rule *android.RuleBuilder, err error) {
 
 	defer func() {
 		if r := recover(); r != nil {
@@ -72,13 +81,13 @@
 
 	var profile android.WritablePath
 	if generateProfile {
-		profile = profileCommand(ctx, global, module, rule)
+		profile = profileCommand(ctx, globalSoong, global, module, rule)
 	}
 	if generateBootProfile {
-		bootProfileCommand(ctx, global, module, rule)
+		bootProfileCommand(ctx, globalSoong, global, module, rule)
 	}
 
-	if !dexpreoptDisabled(global, module) {
+	if !dexpreoptDisabled(ctx, global, module) {
 		// Don't preopt individual boot jars, they will be preopted together.
 		if !contains(global.BootJars, module.Name) {
 			appImage := (generateProfile || module.ForceCreateAppImage || global.DefaultAppImages) &&
@@ -87,7 +96,7 @@
 			generateDM := shouldGenerateDM(module, global)
 
 			for archIdx, _ := range module.Archs {
-				dexpreoptCommand(ctx, global, module, rule, archIdx, profile, appImage, generateDM)
+				dexpreoptCommand(ctx, globalSoong, global, module, rule, archIdx, profile, appImage, generateDM)
 			}
 		}
 	}
@@ -95,14 +104,21 @@
 	return rule, nil
 }
 
-func dexpreoptDisabled(global GlobalConfig, module ModuleConfig) bool {
+func dexpreoptDisabled(ctx android.PathContext, global *GlobalConfig, module *ModuleConfig) bool {
 	if contains(global.DisablePreoptModules, module.Name) {
 		return true
 	}
 
 	// Don't preopt system server jars that are updatable.
 	for _, p := range global.UpdatableSystemServerJars {
-		if _, jar := SplitApexJarPair(p); jar == module.Name {
+		if _, jar := android.SplitApexJarPair(p); jar == module.Name {
+			return true
+		}
+	}
+
+	// Don't preopt system server jars that are not Soong modules.
+	if android.InList(module.Name, NonUpdatableSystemServerJars(ctx, global)) {
+		if _, ok := ctx.(android.ModuleContext); !ok {
 			return true
 		}
 	}
@@ -119,8 +135,8 @@
 	return false
 }
 
-func profileCommand(ctx android.PathContext, global GlobalConfig, module ModuleConfig,
-	rule *android.RuleBuilder) android.WritablePath {
+func profileCommand(ctx android.PathContext, globalSoong *GlobalSoongConfig, global *GlobalConfig,
+	module *ModuleConfig, rule *android.RuleBuilder) android.WritablePath {
 
 	profilePath := module.BuildPath.InSameDir(ctx, "profile.prof")
 	profileInstalledPath := module.DexLocation + ".prof"
@@ -131,7 +147,7 @@
 
 	cmd := rule.Command().
 		Text(`ANDROID_LOG_TAGS="*:e"`).
-		Tool(global.SoongConfig.Profman)
+		Tool(globalSoong.Profman)
 
 	if module.ProfileIsTextListing {
 		// The profile is a test listing of classes (used for framework jars).
@@ -158,8 +174,8 @@
 	return profilePath
 }
 
-func bootProfileCommand(ctx android.PathContext, global GlobalConfig, module ModuleConfig,
-	rule *android.RuleBuilder) android.WritablePath {
+func bootProfileCommand(ctx android.PathContext, globalSoong *GlobalSoongConfig, global *GlobalConfig,
+	module *ModuleConfig, rule *android.RuleBuilder) android.WritablePath {
 
 	profilePath := module.BuildPath.InSameDir(ctx, "profile.bprof")
 	profileInstalledPath := module.DexLocation + ".bprof"
@@ -170,7 +186,7 @@
 
 	cmd := rule.Command().
 		Text(`ANDROID_LOG_TAGS="*:e"`).
-		Tool(global.SoongConfig.Profman)
+		Tool(globalSoong.Profman)
 
 	// The profile is a test listing of methods.
 	// We need to generate the actual binary profile.
@@ -190,8 +206,9 @@
 	return profilePath
 }
 
-func dexpreoptCommand(ctx android.PathContext, global GlobalConfig, module ModuleConfig, rule *android.RuleBuilder,
-	archIdx int, profile android.WritablePath, appImage bool, generateDM bool) {
+func dexpreoptCommand(ctx android.PathContext, globalSoong *GlobalSoongConfig, global *GlobalConfig,
+	module *ModuleConfig, rule *android.RuleBuilder, archIdx int, profile android.WritablePath,
+	appImage bool, generateDM bool) {
 
 	arch := module.Archs[archIdx]
 
@@ -236,7 +253,8 @@
 	var conditionalClassLoaderContextHost29 android.Paths
 	var conditionalClassLoaderContextTarget29 []string
 
-	var classLoaderContextHostString string
+	var classLoaderContextHostString, classLoaderContextDeviceString string
+	var classLoaderDeps android.Paths
 
 	if module.EnforceUsesLibraries {
 		usesLibs := append(copyOf(module.UsesLibraries), module.PresentOptionalUsesLibraries...)
@@ -282,6 +300,30 @@
 			filepath.Join("/system/framework", hidlBase+".jar"))
 
 		classLoaderContextHostString = strings.Join(classLoaderContextHost.Strings(), ":")
+	} else if android.InList(module.Name, NonUpdatableSystemServerJars(ctx, global)) {
+		// We expect that all dexpreopted system server jars are Soong modules.
+		mctx, isModule := ctx.(android.ModuleContext)
+		if !isModule {
+			panic("Cannot dexpreopt system server jar that is not a soong module.")
+		}
+
+		// System server jars should be dexpreopted together: class loader context of each jar
+		// should include preceding jars (which can be found as dependencies of the current jar
+		// with a special tag).
+		var jarsOnHost android.Paths
+		var jarsOnDevice []string
+		mctx.VisitDirectDepsWithTag(SystemServerDepTag, func(dep android.Module) {
+			depName := mctx.OtherModuleName(dep)
+			if jar, ok := dep.(interface{ DexJar() android.Path }); ok {
+				jarsOnHost = append(jarsOnHost, jar.DexJar())
+				jarsOnDevice = append(jarsOnDevice, "/system/framework/"+depName+".jar")
+			} else {
+				mctx.ModuleErrorf("module \"%s\" is not a jar", depName)
+			}
+		})
+		classLoaderContextHostString = strings.Join(jarsOnHost.Strings(), ":")
+		classLoaderContextDeviceString = strings.Join(jarsOnDevice, ":")
+		classLoaderDeps = jarsOnHost
 	} else {
 		// Pass special class loader context to skip the classpath and collision check.
 		// This will get removed once LOCAL_USES_LIBRARIES is enforced.
@@ -293,20 +335,25 @@
 	rule.Command().FlagWithArg("mkdir -p ", filepath.Dir(odexPath.String()))
 	rule.Command().FlagWithOutput("rm -f ", odexPath)
 	// Set values in the environment of the rule.  These may be modified by construct_context.sh.
-	rule.Command().FlagWithArg("class_loader_context_arg=--class-loader-context=", classLoaderContextHostString)
-	rule.Command().Text(`stored_class_loader_context_arg=""`)
+	if classLoaderContextHostString == `\&` {
+		rule.Command().Text(`class_loader_context_arg=--class-loader-context=\&`)
+		rule.Command().Text(`stored_class_loader_context_arg=""`)
+	} else {
+		rule.Command().Text("class_loader_context_arg=--class-loader-context=PCL[" + classLoaderContextHostString + "]")
+		rule.Command().Text("stored_class_loader_context_arg=--stored-class-loader-context=PCL[" + classLoaderContextDeviceString + "]")
+	}
 
 	if module.EnforceUsesLibraries {
 		if module.ManifestPath != nil {
 			rule.Command().Text(`target_sdk_version="$(`).
-				Tool(global.SoongConfig.ManifestCheck).
+				Tool(globalSoong.ManifestCheck).
 				Flag("--extract-target-sdk-version").
 				Input(module.ManifestPath).
 				Text(`)"`)
 		} else {
 			// No manifest to extract targetSdkVersion from, hope that DexJar is an APK
 			rule.Command().Text(`target_sdk_version="$(`).
-				Tool(global.SoongConfig.Aapt).
+				Tool(globalSoong.Aapt).
 				Flag("dump badging").
 				Input(module.DexPath).
 				Text(`| grep "targetSdkVersion" | sed -n "s/targetSdkVersion:'\(.*\)'/\1/p"`).
@@ -327,7 +374,7 @@
 			Implicits(conditionalClassLoaderContextHost29)
 		rule.Command().Textf(`conditional_target_libs_29="%s"`,
 			strings.Join(conditionalClassLoaderContextTarget29, " "))
-		rule.Command().Text("source").Tool(global.SoongConfig.ConstructContext).Input(module.DexPath)
+		rule.Command().Text("source").Tool(globalSoong.ConstructContext).Input(module.DexPath)
 	}
 
 	// Devices that do not have a product partition use a symlink from /product to /system/product.
@@ -340,7 +387,7 @@
 
 	cmd := rule.Command().
 		Text(`ANDROID_LOG_TAGS="*:e"`).
-		Tool(global.SoongConfig.Dex2oat).
+		Tool(globalSoong.Dex2oat).
 		Flag("--avoid-storing-invocation").
 		FlagWithOutput("--write-invocation-to=", invocationPath).ImplicitOutput(invocationPath).
 		Flag("--runtime-arg").FlagWithArg("-Xms", global.Dex2oatXms).
@@ -348,7 +395,7 @@
 		Flag("--runtime-arg").FlagWithInputList("-Xbootclasspath:", module.PreoptBootClassPathDexFiles, ":").
 		Flag("--runtime-arg").FlagWithList("-Xbootclasspath-locations:", module.PreoptBootClassPathDexLocations, ":").
 		Flag("${class_loader_context_arg}").
-		Flag("${stored_class_loader_context_arg}").
+		Flag("${stored_class_loader_context_arg}").Implicits(classLoaderDeps).
 		FlagWithArg("--boot-image=", strings.Join(module.DexPreoptImageLocations, ":")).Implicits(module.DexPreoptImagesDeps[archIdx].Paths()).
 		FlagWithInput("--dex-file=", module.DexPath).
 		FlagWithArg("--dex-location=", dexLocationArg).
@@ -379,7 +426,7 @@
 		cmd.FlagWithArg("--copy-dex-files=", "false")
 	}
 
-	if !anyHavePrefix(preoptFlags, "--compiler-filter=") {
+	if !android.PrefixInList(preoptFlags, "--compiler-filter=") {
 		var compilerFilter string
 		if contains(global.SystemServerJars, module.Name) {
 			// Jars of system server, use the product option if it is set, speed otherwise.
@@ -409,7 +456,7 @@
 		dmInstalledPath := pathtools.ReplaceExtension(module.DexLocation, "dm")
 		tmpPath := module.BuildPath.InSameDir(ctx, "primary.vdex")
 		rule.Command().Text("cp -f").Input(vdexPath).Output(tmpPath)
-		rule.Command().Tool(global.SoongConfig.SoongZip).
+		rule.Command().Tool(globalSoong.SoongZip).
 			FlagWithArg("-L", "9").
 			FlagWithOutput("-o", dmPath).
 			Flag("-j").
@@ -474,14 +521,14 @@
 	rule.Install(vdexPath, vdexInstallPath)
 }
 
-func shouldGenerateDM(module ModuleConfig, global GlobalConfig) bool {
+func shouldGenerateDM(module *ModuleConfig, global *GlobalConfig) bool {
 	// Generating DM files only makes sense for verify, avoid doing for non verify compiler filter APKs.
 	// No reason to use a dm file if the dex is already uncompressed.
 	return global.GenerateDMFiles && !module.UncompressedDex &&
 		contains(module.PreoptFlags, "--compiler-filter=verify")
 }
 
-func OdexOnSystemOtherByName(name string, dexLocation string, global GlobalConfig) bool {
+func OdexOnSystemOtherByName(name string, dexLocation string, global *GlobalConfig) bool {
 	if !global.HasSystemOther {
 		return false
 	}
@@ -503,7 +550,7 @@
 	return false
 }
 
-func odexOnSystemOther(module ModuleConfig, global GlobalConfig) bool {
+func odexOnSystemOther(module *ModuleConfig, global *GlobalConfig) bool {
 	return OdexOnSystemOtherByName(module.Name, module.DexLocation, global)
 }
 
@@ -516,7 +563,7 @@
 	return filepath.Join(filepath.Dir(filepath.Dir(path.String())), filepath.Base(path.String()))
 }
 
-func pathForLibrary(module ModuleConfig, lib string) android.Path {
+func pathForLibrary(module *ModuleConfig, lib string) android.Path {
 	path, ok := module.LibraryPaths[lib]
 	if !ok {
 		panic(fmt.Errorf("unknown library path for %q", lib))
@@ -537,19 +584,29 @@
 }
 
 // Expected format for apexJarValue = <apex name>:<jar name>
-func SplitApexJarPair(apexJarValue string) (string, string) {
-	var apexJarPair []string = strings.SplitN(apexJarValue, ":", 2)
-	if apexJarPair == nil || len(apexJarPair) != 2 {
-		panic(fmt.Errorf("malformed apexJarValue: %q, expected format: <apex>:<jar>",
-			apexJarValue))
-	}
-	return apexJarPair[0], apexJarPair[1]
+func GetJarLocationFromApexJarPair(apexJarValue string) string {
+	apex, jar := android.SplitApexJarPair(apexJarValue)
+	return filepath.Join("/apex", apex, "javalib", jar+".jar")
 }
 
-// Expected format for apexJarValue = <apex name>:<jar name>
-func GetJarLocationFromApexJarPair(apexJarValue string) string {
-	apex, jar := SplitApexJarPair(apexJarValue)
-	return filepath.Join("/apex", apex, "javalib", jar+".jar")
+func GetJarsFromApexJarPairs(apexJarPairs []string) []string {
+	modules := make([]string, len(apexJarPairs))
+	for i, p := range apexJarPairs {
+		_, jar := android.SplitApexJarPair(p)
+		modules[i] = jar
+	}
+	return modules
+}
+
+var nonUpdatableSystemServerJarsKey = android.NewOnceKey("nonUpdatableSystemServerJars")
+
+// TODO: eliminate the superficial global config parameter by moving global config definition
+// from java subpackage to dexpreopt.
+func NonUpdatableSystemServerJars(ctx android.PathContext, global *GlobalConfig) []string {
+	return ctx.Config().Once(nonUpdatableSystemServerJarsKey, func() interface{} {
+		return android.RemoveListFromList(global.SystemServerJars,
+			GetJarsFromApexJarPairs(global.UpdatableSystemServerJars))
+	}).([]string)
 }
 
 func contains(l []string, s string) bool {
@@ -561,32 +618,4 @@
 	return false
 }
 
-// remove all elements in a from b, returning a new slice
-func filterOut(a []string, b []string) []string {
-	var ret []string
-	for _, x := range b {
-		if !contains(a, x) {
-			ret = append(ret, x)
-		}
-	}
-	return ret
-}
-
-func replace(l []string, from, to string) {
-	for i := range l {
-		if l[i] == from {
-			l[i] = to
-		}
-	}
-}
-
 var copyOf = android.CopyOf
-
-func anyHavePrefix(l []string, prefix string) bool {
-	for _, x := range l {
-		if strings.HasPrefix(x, prefix) {
-			return true
-		}
-	}
-	return false
-}
diff --git a/dexpreopt/dexpreopt_gen/dexpreopt_gen.go b/dexpreopt/dexpreopt_gen/dexpreopt_gen.go
index e2818bb..e89f045 100644
--- a/dexpreopt/dexpreopt_gen/dexpreopt_gen.go
+++ b/dexpreopt/dexpreopt_gen/dexpreopt_gen.go
@@ -80,13 +80,13 @@
 
 	globalSoongConfigData, err := ioutil.ReadFile(*globalSoongConfigPath)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "error reading global config %q: %s\n", *globalSoongConfigPath, err)
+		fmt.Fprintf(os.Stderr, "error reading global Soong config %q: %s\n", *globalSoongConfigPath, err)
 		os.Exit(2)
 	}
 
-	globalSoongConfig, err := dexpreopt.LoadGlobalSoongConfig(ctx, globalSoongConfigData)
+	globalSoongConfig, err := dexpreopt.ParseGlobalSoongConfig(ctx, globalSoongConfigData)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "error loading global config %q: %s\n", *globalSoongConfigPath, err)
+		fmt.Fprintf(os.Stderr, "error parsing global Soong config %q: %s\n", *globalSoongConfigPath, err)
 		os.Exit(2)
 	}
 
@@ -96,9 +96,9 @@
 		os.Exit(2)
 	}
 
-	globalConfig, err := dexpreopt.LoadGlobalConfig(ctx, globalConfigData, globalSoongConfig)
+	globalConfig, err := dexpreopt.ParseGlobalConfig(ctx, globalConfigData)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "error parse global config %q: %s\n", *globalConfigPath, err)
+		fmt.Fprintf(os.Stderr, "error parsing global config %q: %s\n", *globalConfigPath, err)
 		os.Exit(2)
 	}
 
@@ -108,9 +108,9 @@
 		os.Exit(2)
 	}
 
-	moduleConfig, err := dexpreopt.LoadModuleConfig(ctx, moduleConfigData)
+	moduleConfig, err := dexpreopt.ParseModuleConfig(ctx, moduleConfigData)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "error loading module config %q: %s\n", *moduleConfigPath, err)
+		fmt.Fprintf(os.Stderr, "error parsing module config %q: %s\n", *moduleConfigPath, err)
 		os.Exit(2)
 	}
 
@@ -130,12 +130,12 @@
 		}
 	}()
 
-	writeScripts(ctx, globalConfig, moduleConfig, *dexpreoptScriptPath)
+	writeScripts(ctx, globalSoongConfig, globalConfig, moduleConfig, *dexpreoptScriptPath)
 }
 
-func writeScripts(ctx android.PathContext, global dexpreopt.GlobalConfig, module dexpreopt.ModuleConfig,
-	dexpreoptScriptPath string) {
-	dexpreoptRule, err := dexpreopt.GenerateDexpreoptRule(ctx, global, module)
+func writeScripts(ctx android.PathContext, globalSoong *dexpreopt.GlobalSoongConfig,
+	global *dexpreopt.GlobalConfig, module *dexpreopt.ModuleConfig, dexpreoptScriptPath string) {
+	dexpreoptRule, err := dexpreopt.GenerateDexpreoptRule(ctx, globalSoong, global, module)
 	if err != nil {
 		panic(err)
 	}
@@ -150,7 +150,7 @@
 		dexpreoptRule.Command().Text("mkdir -p").Flag(filepath.Dir(installPath.String()))
 		dexpreoptRule.Command().Text("cp -f").Input(install.From).Output(installPath)
 	}
-	dexpreoptRule.Command().Tool(global.SoongConfig.SoongZip).
+	dexpreoptRule.Command().Tool(globalSoong.SoongZip).
 		FlagWithArg("-o ", "$2").
 		FlagWithArg("-C ", installDir.String()).
 		FlagWithArg("-D ", installDir.String())
diff --git a/dexpreopt/dexpreopt_test.go b/dexpreopt/dexpreopt_test.go
index a128dc0..d239993 100644
--- a/dexpreopt/dexpreopt_test.go
+++ b/dexpreopt/dexpreopt_test.go
@@ -20,20 +20,20 @@
 	"testing"
 )
 
-func testSystemModuleConfig(ctx android.PathContext, name string) ModuleConfig {
+func testSystemModuleConfig(ctx android.PathContext, name string) *ModuleConfig {
 	return testModuleConfig(ctx, name, "system")
 }
 
-func testSystemProductModuleConfig(ctx android.PathContext, name string) ModuleConfig {
+func testSystemProductModuleConfig(ctx android.PathContext, name string) *ModuleConfig {
 	return testModuleConfig(ctx, name, "system/product")
 }
 
-func testProductModuleConfig(ctx android.PathContext, name string) ModuleConfig {
+func testProductModuleConfig(ctx android.PathContext, name string) *ModuleConfig {
 	return testModuleConfig(ctx, name, "product")
 }
 
-func testModuleConfig(ctx android.PathContext, name, partition string) ModuleConfig {
-	return ModuleConfig{
+func testModuleConfig(ctx android.PathContext, name, partition string) *ModuleConfig {
+	return &ModuleConfig{
 		Name:                            name,
 		DexLocation:                     fmt.Sprintf("/%s/app/test/%s.apk", partition, name),
 		BuildPath:                       android.PathForOutput(ctx, fmt.Sprintf("%s/%s.apk", name, name)),
@@ -61,10 +61,13 @@
 }
 
 func TestDexPreopt(t *testing.T) {
-	ctx := android.PathContextForTesting(android.TestConfig("out", nil, "", nil))
-	global, module := GlobalConfigForTests(ctx), testSystemModuleConfig(ctx, "test")
+	config := android.TestConfig("out", nil, "", nil)
+	ctx := android.PathContextForTesting(config)
+	globalSoong := GlobalSoongConfigForTests(config)
+	global := GlobalConfigForTests(ctx)
+	module := testSystemModuleConfig(ctx, "test")
 
-	rule, err := GenerateDexpreoptRule(ctx, global, module)
+	rule, err := GenerateDexpreoptRule(ctx, globalSoong, global, module)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -80,7 +83,9 @@
 }
 
 func TestDexPreoptSystemOther(t *testing.T) {
-	ctx := android.PathContextForTesting(android.TestConfig("out", nil, "", nil))
+	config := android.TestConfig("out", nil, "", nil)
+	ctx := android.PathContextForTesting(config)
+	globalSoong := GlobalSoongConfigForTests(config)
 	global := GlobalConfigForTests(ctx)
 	systemModule := testSystemModuleConfig(ctx, "Stest")
 	systemProductModule := testSystemProductModuleConfig(ctx, "SPtest")
@@ -89,7 +94,7 @@
 	global.HasSystemOther = true
 
 	type moduleTest struct {
-		module            ModuleConfig
+		module            *ModuleConfig
 		expectedPartition string
 	}
 	tests := []struct {
@@ -118,7 +123,7 @@
 	for _, test := range tests {
 		global.PatternsOnSystemOther = test.patterns
 		for _, mt := range test.moduleTests {
-			rule, err := GenerateDexpreoptRule(ctx, global, mt.module)
+			rule, err := GenerateDexpreoptRule(ctx, globalSoong, global, mt.module)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -138,12 +143,15 @@
 }
 
 func TestDexPreoptProfile(t *testing.T) {
-	ctx := android.PathContextForTesting(android.TestConfig("out", nil, "", nil))
-	global, module := GlobalConfigForTests(ctx), testSystemModuleConfig(ctx, "test")
+	config := android.TestConfig("out", nil, "", nil)
+	ctx := android.PathContextForTesting(config)
+	globalSoong := GlobalSoongConfigForTests(config)
+	global := GlobalConfigForTests(ctx)
+	module := testSystemModuleConfig(ctx, "test")
 
 	module.ProfileClassListing = android.OptionalPathForPath(android.PathForTesting("profile"))
 
-	rule, err := GenerateDexpreoptRule(ctx, global, module)
+	rule, err := GenerateDexpreoptRule(ctx, globalSoong, global, module)
 	if err != nil {
 		t.Fatal(err)
 	}
diff --git a/dexpreopt/testing.go b/dexpreopt/testing.go
new file mode 100644
index 0000000..b572eb3
--- /dev/null
+++ b/dexpreopt/testing.go
@@ -0,0 +1,47 @@
+// Copyright 2020 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 dexpreopt
+
+import (
+	"android/soong/android"
+)
+
+type dummyToolBinary struct {
+	android.ModuleBase
+}
+
+func (m *dummyToolBinary) GenerateAndroidBuildActions(ctx android.ModuleContext) {}
+
+func (m *dummyToolBinary) HostToolPath() android.OptionalPath {
+	return android.OptionalPathForPath(android.PathForTesting("dex2oat"))
+}
+
+func dummyToolBinaryFactory() android.Module {
+	module := &dummyToolBinary{}
+	android.InitAndroidArchModule(module, android.HostSupported, android.MultilibFirst)
+	return module
+}
+
+func RegisterToolModulesForTest(ctx *android.TestContext) {
+	ctx.RegisterModuleType("dummy_tool_binary", dummyToolBinaryFactory)
+}
+
+func BpToolModulesForTest() string {
+	return `
+		dummy_tool_binary {
+			name: "dex2oatd",
+		}
+	`
+}
diff --git a/java/aar.go b/java/aar.go
index 24c5e7d..6e3b9e6 100644
--- a/java/aar.go
+++ b/java/aar.go
@@ -101,6 +101,7 @@
 	usesNonSdkApis          bool
 	sdkLibraries            []string
 	hasNoCode               bool
+	LoggingParent           string
 
 	splitNames []string
 	splits     []split
@@ -134,15 +135,8 @@
 	manifestPath android.Path) (compileFlags, linkFlags []string, linkDeps android.Paths,
 	resDirs, overlayDirs []globbedResourceDir, rroDirs []rroDir, resZips android.Paths) {
 
-	hasVersionCode := false
-	hasVersionName := false
-	for _, f := range a.aaptProperties.Aaptflags {
-		if strings.HasPrefix(f, "--version-code") {
-			hasVersionCode = true
-		} else if strings.HasPrefix(f, "--version-name") {
-			hasVersionName = true
-		}
-	}
+	hasVersionCode := android.PrefixInList(a.aaptProperties.Aaptflags, "--version-code")
+	hasVersionName := android.PrefixInList(a.aaptProperties.Aaptflags, "--version-name")
 
 	// Flags specified in Android.bp
 	linkFlags = append(linkFlags, a.aaptProperties.Aaptflags...)
@@ -241,7 +235,8 @@
 	manifestSrcPath := android.PathForModuleSrc(ctx, manifestFile)
 
 	manifestPath := manifestFixer(ctx, manifestSrcPath, sdkContext, sdkLibraries,
-		a.isLibrary, a.useEmbeddedNativeLibs, a.usesNonSdkApis, a.useEmbeddedDex, a.hasNoCode)
+		a.isLibrary, a.useEmbeddedNativeLibs, a.usesNonSdkApis, a.useEmbeddedDex, a.hasNoCode,
+		a.LoggingParent)
 
 	// Add additional manifest files to transitive manifests.
 	additionalManifests := android.PathsForModuleSrc(ctx, a.aaptProperties.Additional_manifests)
@@ -337,7 +332,7 @@
 
 	// Extract assets from the resource package output so that they can be used later in aapt2link
 	// for modules that depend on this one.
-	if android.PrefixedStringInList(linkFlags, "-A ") || len(assetPackages) > 0 {
+	if android.PrefixInList(linkFlags, "-A ") || len(assetPackages) > 0 {
 		assets := android.PathForModuleOut(ctx, "assets.zip")
 		ctx.Build(pctx, android.BuildParams{
 			Rule:        extractAssetsRule,
diff --git a/java/android_manifest.go b/java/android_manifest.go
index e3646f5..9a71be2 100644
--- a/java/android_manifest.go
+++ b/java/android_manifest.go
@@ -53,7 +53,7 @@
 
 // Uses manifest_fixer.py to inject minSdkVersion, etc. into an AndroidManifest.xml
 func manifestFixer(ctx android.ModuleContext, manifest android.Path, sdkContext sdkContext, sdkLibraries []string,
-	isLibrary, useEmbeddedNativeLibs, usesNonSdkApis, useEmbeddedDex, hasNoCode bool) android.Path {
+	isLibrary, useEmbeddedNativeLibs, usesNonSdkApis, useEmbeddedDex, hasNoCode bool, loggingParent string) android.Path {
 
 	var args []string
 	if isLibrary {
@@ -91,6 +91,9 @@
 		args = append(args, "--has-no-code")
 	}
 
+	if loggingParent != "" {
+		args = append(args, "--logging-parent", loggingParent)
+	}
 	var deps android.Paths
 	targetSdkVersion, err := sdkContext.targetSdkVersion().effectiveVersionString(ctx)
 	if err != nil {
diff --git a/java/app.go b/java/app.go
index 9503ec4..71bad68 100755
--- a/java/app.go
+++ b/java/app.go
@@ -111,6 +111,9 @@
 
 	// the package name of this app. The package name in the manifest file is used if one was not given.
 	Package_name *string
+
+	// the logging parent of this app.
+	Logging_parent *string
 }
 
 type AndroidApp struct {
@@ -142,6 +145,10 @@
 	noticeOutputs android.NoticeOutputs
 }
 
+func (a *AndroidApp) IsInstallable() bool {
+	return Bool(a.properties.Installable)
+}
+
 func (a *AndroidApp) ExportedProguardFlagFiles() android.Paths {
 	return nil
 }
@@ -269,13 +276,7 @@
 	aaptLinkFlags := []string{}
 
 	// Add TARGET_AAPT_CHARACTERISTICS values to AAPT link flags if they exist and --product flags were not provided.
-	hasProduct := false
-	for _, f := range a.aaptProperties.Aaptflags {
-		if strings.HasPrefix(f, "--product") {
-			hasProduct = true
-			break
-		}
-	}
+	hasProduct := android.PrefixInList(a.aaptProperties.Aaptflags, "--product")
 	if !hasProduct && len(ctx.Config().ProductAAPTCharacteristics()) > 0 {
 		aaptLinkFlags = append(aaptLinkFlags, "--product", ctx.Config().ProductAAPTCharacteristics())
 	}
@@ -305,7 +306,7 @@
 
 	a.aapt.splitNames = a.appProperties.Package_splits
 	a.aapt.sdkLibraries = a.exportedSdkLibs
-
+	a.aapt.LoggingParent = String(a.overridableAppProperties.Logging_parent)
 	a.aapt.buildActions(ctx, sdkContext(a), aaptLinkFlags...)
 
 	// apps manifests are handled by aapt, don't let Module see them
@@ -338,7 +339,6 @@
 		installDir = filepath.Join("app", a.installApkName)
 	}
 	a.dexpreopter.installPath = android.PathForModuleInstall(ctx, installDir, a.installApkName+".apk")
-	a.dexpreopter.isInstallable = Bool(a.properties.Installable)
 	a.dexpreopter.uncompressedDex = a.shouldUncompressDex(ctx)
 
 	a.dexpreopter.enforceUsesLibs = a.usesLibrary.enforceUsesLibraries()
@@ -922,6 +922,10 @@
 	Filename *string
 }
 
+func (a *AndroidAppImport) IsInstallable() bool {
+	return true
+}
+
 // Updates properties with variant-specific values.
 func (a *AndroidAppImport) processVariants(ctx android.LoadHookContext) {
 	config := ctx.Config()
@@ -1064,7 +1068,6 @@
 	}
 
 	a.dexpreopter.installPath = installDir.Join(ctx, a.BaseModuleName()+".apk")
-	a.dexpreopter.isInstallable = true
 	a.dexpreopter.isPresignedPrebuilt = Bool(a.properties.Presigned)
 	a.dexpreopter.uncompressedDex = a.shouldUncompressDex(ctx)
 
diff --git a/java/app_test.go b/java/app_test.go
index c86b038..6d94160 100644
--- a/java/app_test.go
+++ b/java/app_test.go
@@ -1181,6 +1181,7 @@
 			name: "bar",
 			base: "foo",
 			certificate: ":new_certificate",
+			logging_parent: "bah",
 		}
 
 		android_app_certificate {
@@ -1196,37 +1197,41 @@
 		`)
 
 	expectedVariants := []struct {
-		moduleName  string
-		variantName string
-		apkName     string
-		apkPath     string
-		signFlag    string
-		overrides   []string
-		aaptFlag    string
+		moduleName     string
+		variantName    string
+		apkName        string
+		apkPath        string
+		signFlag       string
+		overrides      []string
+		aaptFlag       string
+		logging_parent string
 	}{
 		{
-			moduleName:  "foo",
-			variantName: "android_common",
-			apkPath:     "/target/product/test_device/system/app/foo/foo.apk",
-			signFlag:    "build/make/target/product/security/expiredkey.x509.pem build/make/target/product/security/expiredkey.pk8",
-			overrides:   []string{"qux"},
-			aaptFlag:    "",
+			moduleName:     "foo",
+			variantName:    "android_common",
+			apkPath:        "/target/product/test_device/system/app/foo/foo.apk",
+			signFlag:       "build/make/target/product/security/expiredkey.x509.pem build/make/target/product/security/expiredkey.pk8",
+			overrides:      []string{"qux"},
+			aaptFlag:       "",
+			logging_parent: "",
 		},
 		{
-			moduleName:  "bar",
-			variantName: "android_common_bar",
-			apkPath:     "/target/product/test_device/system/app/bar/bar.apk",
-			signFlag:    "cert/new_cert.x509.pem cert/new_cert.pk8",
-			overrides:   []string{"qux", "foo"},
-			aaptFlag:    "",
+			moduleName:     "bar",
+			variantName:    "android_common_bar",
+			apkPath:        "/target/product/test_device/system/app/bar/bar.apk",
+			signFlag:       "cert/new_cert.x509.pem cert/new_cert.pk8",
+			overrides:      []string{"qux", "foo"},
+			aaptFlag:       "",
+			logging_parent: "bah",
 		},
 		{
-			moduleName:  "baz",
-			variantName: "android_common_baz",
-			apkPath:     "/target/product/test_device/system/app/baz/baz.apk",
-			signFlag:    "build/make/target/product/security/expiredkey.x509.pem build/make/target/product/security/expiredkey.pk8",
-			overrides:   []string{"qux", "foo"},
-			aaptFlag:    "--rename-manifest-package org.dandroid.bp",
+			moduleName:     "baz",
+			variantName:    "android_common_baz",
+			apkPath:        "/target/product/test_device/system/app/baz/baz.apk",
+			signFlag:       "build/make/target/product/security/expiredkey.x509.pem build/make/target/product/security/expiredkey.pk8",
+			overrides:      []string{"qux", "foo"},
+			aaptFlag:       "--rename-manifest-package org.dandroid.bp",
+			logging_parent: "",
 		},
 	}
 	for _, expected := range expectedVariants {
@@ -1260,6 +1265,13 @@
 				expected.overrides, mod.appProperties.Overrides)
 		}
 
+		// Test Overridable property: Logging_parent
+		logging_parent := mod.aapt.LoggingParent
+		if expected.logging_parent != logging_parent {
+			t.Errorf("Incorrect overrides property value for logging parent, expected: %q, got: %q",
+				expected.logging_parent, logging_parent)
+		}
+
 		// Check the package renaming flag, if exists.
 		res := variant.Output("package-res.apk")
 		aapt2Flags := res.Args["flags"]
diff --git a/java/dexpreopt.go b/java/dexpreopt.go
index 5faec08..4313964 100644
--- a/java/dexpreopt.go
+++ b/java/dexpreopt.go
@@ -19,6 +19,11 @@
 	"android/soong/dexpreopt"
 )
 
+type dexpreopterInterface interface {
+	IsInstallable() bool // Structs that embed dexpreopter must implement this.
+	dexpreoptDisabled(ctx android.BaseModuleContext) bool
+}
+
 type dexpreopter struct {
 	dexpreoptProperties DexpreoptProperties
 
@@ -26,7 +31,6 @@
 	uncompressedDex     bool
 	isSDKLibrary        bool
 	isTest              bool
-	isInstallable       bool
 	isPresignedPrebuilt bool
 
 	manifestFile     android.Path
@@ -58,8 +62,8 @@
 	}
 }
 
-func (d *dexpreopter) dexpreoptDisabled(ctx android.ModuleContext) bool {
-	global := dexpreoptGlobalConfig(ctx)
+func (d *dexpreopter) dexpreoptDisabled(ctx android.BaseModuleContext) bool {
+	global := dexpreopt.GetGlobalConfig(ctx)
 
 	if global.DisablePreopt {
 		return true
@@ -81,7 +85,11 @@
 		return true
 	}
 
-	if !d.isInstallable {
+	if !ctx.Module().(dexpreopterInterface).IsInstallable() {
+		return true
+	}
+
+	if ctx.Host() {
 		return true
 	}
 
@@ -95,30 +103,34 @@
 	return false
 }
 
+func dexpreoptToolDepsMutator(ctx android.BottomUpMutatorContext) {
+	if d, ok := ctx.Module().(dexpreopterInterface); !ok || d.dexpreoptDisabled(ctx) {
+		return
+	}
+	dexpreopt.RegisterToolDeps(ctx)
+}
+
 func odexOnSystemOther(ctx android.ModuleContext, installPath android.InstallPath) bool {
-	return dexpreopt.OdexOnSystemOtherByName(ctx.ModuleName(), android.InstallPathToOnDevicePath(ctx, installPath), dexpreoptGlobalConfig(ctx))
+	return dexpreopt.OdexOnSystemOtherByName(ctx.ModuleName(), android.InstallPathToOnDevicePath(ctx, installPath), dexpreopt.GetGlobalConfig(ctx))
 }
 
 func (d *dexpreopter) dexpreopt(ctx android.ModuleContext, dexJarFile android.ModuleOutPath) android.ModuleOutPath {
-	if d.dexpreoptDisabled(ctx) {
+	// TODO(b/148690468): The check on d.installPath is to bail out in cases where
+	// the dexpreopter struct hasn't been fully initialized before we're called,
+	// e.g. in aar.go. This keeps the behaviour that dexpreopting is effectively
+	// disabled, even if installable is true.
+	if d.dexpreoptDisabled(ctx) || d.installPath.Base() == "." {
 		return dexJarFile
 	}
 
-	global := dexpreoptGlobalConfig(ctx)
+	globalSoong := dexpreopt.GetGlobalSoongConfig(ctx)
+	global := dexpreopt.GetGlobalConfig(ctx)
 	bootImage := defaultBootImageConfig(ctx)
 	dexFiles := bootImage.dexPathsDeps.Paths()
 	dexLocations := bootImage.dexLocationsDeps
 	if global.UseArtImage {
 		bootImage = artBootImageConfig(ctx)
 	}
-	if global.UseApexImage {
-		bootImage = frameworkJZBootImageConfig(ctx)
-		dexFiles = bootImage.dexPathsDeps.Paths()
-		dexLocations = bootImage.dexLocationsDeps
-		if global.UseArtImage {
-			bootImage = artJZBootImageConfig(ctx)
-		}
-	}
 
 	var archs []android.ArchType
 	for _, a := range ctx.MultiTargets() {
@@ -164,7 +176,7 @@
 		}
 	}
 
-	dexpreoptConfig := dexpreopt.ModuleConfig{
+	dexpreoptConfig := &dexpreopt.ModuleConfig{
 		Name:            ctx.ModuleName(),
 		DexLocation:     dexLocation,
 		BuildPath:       android.PathForModuleOut(ctx, "dexpreopt", ctx.ModuleName()+".jar").OutputPath,
@@ -199,7 +211,7 @@
 		PresignedPrebuilt: d.isPresignedPrebuilt,
 	}
 
-	dexpreoptRule, err := dexpreopt.GenerateDexpreoptRule(ctx, global, dexpreoptConfig)
+	dexpreoptRule, err := dexpreopt.GenerateDexpreoptRule(ctx, globalSoong, global, dexpreoptConfig)
 	if err != nil {
 		ctx.ModuleErrorf("error generating dexpreopt rule: %s", err.Error())
 		return dexJarFile
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 87f6d5e..655a476 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -165,7 +165,7 @@
 }
 
 func skipDexpreoptBootJars(ctx android.PathContext) bool {
-	if dexpreoptGlobalConfig(ctx).DisablePreopt {
+	if dexpreopt.GetGlobalConfig(ctx).DisablePreopt {
 		return true
 	}
 
@@ -197,13 +197,6 @@
 	// Include dexpreopt files for the primary boot image.
 	files := artBootImageConfig(ctx).imagesDeps
 
-	// For JIT-zygote config, also include dexpreopt files for the primary JIT-zygote image.
-	if dexpreoptGlobalConfig(ctx).UseApexImage {
-		for arch, paths := range artJZBootImageConfig(ctx).imagesDeps {
-			files[arch] = append(files[arch], paths...)
-		}
-	}
-
 	return files
 }
 
@@ -212,11 +205,15 @@
 	if skipDexpreoptBootJars(ctx) {
 		return
 	}
+	if dexpreopt.GetCachedGlobalSoongConfig(ctx) == nil {
+		// No module has enabled dexpreopting, so we assume there will be no boot image to make.
+		return
+	}
 
 	d.dexpreoptConfigForMake = android.PathForOutput(ctx, ctx.Config().DeviceName(), "dexpreopt.config")
 	writeGlobalConfigForMake(ctx, d.dexpreoptConfigForMake)
 
-	global := dexpreoptGlobalConfig(ctx)
+	global := dexpreopt.GetGlobalConfig(ctx)
 
 	// Skip recompiling the boot image for the second sanitization phase. We'll get separate paths
 	// and invalidate first-stage artifacts which are crucial to SANITIZE_LITE builds.
@@ -232,11 +229,6 @@
 	d.defaultBootImage = buildBootImage(ctx, defaultBootImageConfig(ctx))
 	// Create boot image for the ART apex (build artifacts are accessed via the global boot image config).
 	d.otherImages = append(d.otherImages, buildBootImage(ctx, artBootImageConfig(ctx)))
-	if global.GenerateApexImage {
-		// Create boot images for the JIT-zygote experiment.
-		d.otherImages = append(d.otherImages, buildBootImage(ctx, artJZBootImageConfig(ctx)))
-		d.otherImages = append(d.otherImages, buildBootImage(ctx, frameworkJZBootImageConfig(ctx)))
-	}
 
 	dumpOatRules(ctx, d.defaultBootImage)
 }
@@ -307,7 +299,8 @@
 func buildBootImageRuleForArch(ctx android.SingletonContext, image *bootImage,
 	arch android.ArchType, profile android.Path, missingDeps []string) android.WritablePaths {
 
-	global := dexpreoptGlobalConfig(ctx)
+	globalSoong := dexpreopt.GetCachedGlobalSoongConfig(ctx)
+	global := dexpreopt.GetGlobalConfig(ctx)
 
 	symbolsDir := image.symbolsDir.Join(ctx, image.installSubdir, arch.String())
 	symbolsFile := symbolsDir.Join(ctx, image.stem+".oat")
@@ -342,7 +335,7 @@
 
 	invocationPath := outputPath.ReplaceExtension(ctx, "invocation")
 
-	cmd.Tool(global.SoongConfig.Dex2oat).
+	cmd.Tool(globalSoong.Dex2oat).
 		Flag("--avoid-storing-invocation").
 		FlagWithOutput("--write-invocation-to=", invocationPath).ImplicitOutput(invocationPath).
 		Flag("--runtime-arg").FlagWithArg("-Xms", global.Dex2oatImageXms).
@@ -445,7 +438,8 @@
 Rebuild with ART_BOOT_IMAGE_EXTRA_ARGS="--runtime-arg -verbose:verifier" to see verification errors.`
 
 func bootImageProfileRule(ctx android.SingletonContext, image *bootImage, missingDeps []string) android.WritablePath {
-	global := dexpreoptGlobalConfig(ctx)
+	globalSoong := dexpreopt.GetCachedGlobalSoongConfig(ctx)
+	global := dexpreopt.GetGlobalConfig(ctx)
 
 	if global.DisableGenerateProfile || ctx.Config().IsPdkBuild() || ctx.Config().UnbundledBuild() {
 		return nil
@@ -476,7 +470,7 @@
 
 		rule.Command().
 			Text(`ANDROID_LOG_TAGS="*:e"`).
-			Tool(global.SoongConfig.Profman).
+			Tool(globalSoong.Profman).
 			FlagWithInput("--create-profile-from=", bootImageProfile).
 			FlagForEachInput("--apk=", image.dexPathsDeps.Paths()).
 			FlagForEachArg("--dex-location=", image.dexLocationsDeps).
@@ -499,7 +493,8 @@
 var bootImageProfileRuleKey = android.NewOnceKey("bootImageProfileRule")
 
 func bootFrameworkProfileRule(ctx android.SingletonContext, image *bootImage, missingDeps []string) android.WritablePath {
-	global := dexpreoptGlobalConfig(ctx)
+	globalSoong := dexpreopt.GetCachedGlobalSoongConfig(ctx)
+	global := dexpreopt.GetGlobalConfig(ctx)
 
 	if global.DisableGenerateProfile || ctx.Config().IsPdkBuild() || ctx.Config().UnbundledBuild() {
 		return nil
@@ -525,7 +520,7 @@
 
 		rule.Command().
 			Text(`ANDROID_LOG_TAGS="*:e"`).
-			Tool(global.SoongConfig.Profman).
+			Tool(globalSoong.Profman).
 			Flag("--generate-boot-profile").
 			FlagWithInput("--create-profile-from=", bootFrameworkProfile).
 			FlagForEachInput("--apk=", image.dexPathsDeps.Paths()).
@@ -587,7 +582,7 @@
 }
 
 func writeGlobalConfigForMake(ctx android.SingletonContext, path android.WritablePath) {
-	data := dexpreoptGlobalConfigRaw(ctx).data
+	data := dexpreopt.GetGlobalConfigRawData(ctx)
 
 	ctx.Build(pctx, android.BuildParams{
 		Rule:   android.WriteFile,
diff --git a/java/dexpreopt_bootjars_test.go b/java/dexpreopt_bootjars_test.go
index 4ce30f6..c3b2133 100644
--- a/java/dexpreopt_bootjars_test.go
+++ b/java/dexpreopt_bootjars_test.go
@@ -49,7 +49,7 @@
 	pathCtx := android.PathContextForTesting(config)
 	dexpreoptConfig := dexpreopt.GlobalConfigForTests(pathCtx)
 	dexpreoptConfig.BootJars = []string{"foo", "bar", "baz"}
-	setDexpreoptTestGlobalConfig(config, dexpreoptConfig)
+	dexpreopt.SetTestGlobalConfig(config, dexpreoptConfig)
 
 	ctx := testContext()
 
diff --git a/java/dexpreopt_config.go b/java/dexpreopt_config.go
index 637a32f..96f8042 100644
--- a/java/dexpreopt_config.go
+++ b/java/dexpreopt_config.go
@@ -22,60 +22,14 @@
 	"android/soong/dexpreopt"
 )
 
-// dexpreoptGlobalConfig returns the global dexpreopt.config.  It is loaded once the first time it is called for any
-// ctx.Config(), and returns the same data for all future calls with the same ctx.Config().  A value can be inserted
-// for tests using setDexpreoptTestGlobalConfig.
-func dexpreoptGlobalConfig(ctx android.PathContext) dexpreopt.GlobalConfig {
-	return dexpreoptGlobalConfigRaw(ctx).global
-}
-
-type globalConfigAndRaw struct {
-	global dexpreopt.GlobalConfig
-	data   []byte
-}
-
-func dexpreoptGlobalConfigRaw(ctx android.PathContext) globalConfigAndRaw {
-	return ctx.Config().Once(dexpreoptGlobalConfigKey, func() interface{} {
-		if data, err := ctx.Config().DexpreoptGlobalConfig(ctx); err != nil {
-			panic(err)
-		} else if data != nil {
-			soongConfig := dexpreopt.CreateGlobalSoongConfig(ctx)
-			globalConfig, err := dexpreopt.LoadGlobalConfig(ctx, data, soongConfig)
-			if err != nil {
-				panic(err)
-			}
-			return globalConfigAndRaw{globalConfig, data}
-		}
-
-		// No global config filename set, see if there is a test config set
-		return ctx.Config().Once(dexpreoptTestGlobalConfigKey, func() interface{} {
-			// Nope, return a config with preopting disabled
-			return globalConfigAndRaw{dexpreopt.GlobalConfig{
-				DisablePreopt:          true,
-				DisableGenerateProfile: true,
-			}, nil}
-		})
-	}).(globalConfigAndRaw)
-}
-
-// setDexpreoptTestGlobalConfig sets a GlobalConfig that future calls to dexpreoptGlobalConfig will return.  It must
-// be called before the first call to dexpreoptGlobalConfig for the config.
-func setDexpreoptTestGlobalConfig(config android.Config, globalConfig dexpreopt.GlobalConfig) {
-	config.Once(dexpreoptTestGlobalConfigKey, func() interface{} { return globalConfigAndRaw{globalConfig, nil} })
-}
-
-var dexpreoptGlobalConfigKey = android.NewOnceKey("DexpreoptGlobalConfig")
-var dexpreoptTestGlobalConfigKey = android.NewOnceKey("TestDexpreoptGlobalConfig")
-
 // systemServerClasspath returns the on-device locations of the modules in the system server classpath.  It is computed
 // once the first time it is called for any ctx.Config(), and returns the same slice for all future calls with the same
 // ctx.Config().
-func systemServerClasspath(ctx android.PathContext) []string {
+func systemServerClasspath(ctx android.MakeVarsContext) []string {
 	return ctx.Config().OnceStringSlice(systemServerClasspathKey, func() []string {
-		global := dexpreoptGlobalConfig(ctx)
-
+		global := dexpreopt.GetGlobalConfig(ctx)
 		var systemServerClasspathLocations []string
-		for _, m := range global.SystemServerJars {
+		for _, m := range *DexpreoptedSystemServerJars(ctx.Config()) {
 			systemServerClasspathLocations = append(systemServerClasspathLocations,
 				filepath.Join("/system/framework", m+".jar"))
 		}
@@ -112,28 +66,17 @@
 	return moduleName
 }
 
-func getJarsFromApexJarPairs(apexJarPairs []string) []string {
-	modules := make([]string, len(apexJarPairs))
-	for i, p := range apexJarPairs {
-		_, jar := dexpreopt.SplitApexJarPair(p)
-		modules[i] = jar
-	}
-	return modules
-}
-
 var (
-	bootImageConfigKey       = android.NewOnceKey("bootImageConfig")
-	artBootImageName         = "art"
-	frameworkBootImageName   = "boot"
-	artJZBootImageName       = "jitzygote-art"
-	frameworkJZBootImageName = "jitzygote-boot"
+	bootImageConfigKey     = android.NewOnceKey("bootImageConfig")
+	artBootImageName       = "art"
+	frameworkBootImageName = "boot"
 )
 
 // Construct the global boot image configs.
 func genBootImageConfigs(ctx android.PathContext) map[string]*bootImageConfig {
 	return ctx.Config().Once(bootImageConfigKey, func() interface{} {
 
-		global := dexpreoptGlobalConfig(ctx)
+		global := dexpreopt.GetGlobalConfig(ctx)
 		targets := dexpreoptTargets(ctx)
 		deviceDir := android.PathForOutput(ctx, ctx.Config().DeviceName())
 
@@ -143,7 +86,7 @@
 			artModules = append(artModules, "jacocoagent")
 		}
 		frameworkModules := android.RemoveListFromList(global.BootJars,
-			concat(artModules, getJarsFromApexJarPairs(global.UpdatableBootJars)))
+			concat(artModules, dexpreopt.GetJarsFromApexJarPairs(global.UpdatableBootJars)))
 
 		artSubdir := "apex/com.android.art/javalib"
 		frameworkSubdir := "system/framework"
@@ -180,33 +123,9 @@
 			dexLocationsDeps: append(artLocations, frameworkLocations...),
 		}
 
-		// ART config for JIT-zygote boot image.
-		artJZCfg := bootImageConfig{
-			extension:        false,
-			name:             artJZBootImageName,
-			stem:             "apex",
-			installSubdir:    artSubdir,
-			modules:          artModules,
-			dexLocations:     artLocations,
-			dexLocationsDeps: artLocations,
-		}
-
-		// Framework config for JIT-zygote boot image extension.
-		frameworkJZCfg := bootImageConfig{
-			extension:        true,
-			name:             frameworkJZBootImageName,
-			stem:             "apex",
-			installSubdir:    frameworkSubdir,
-			modules:          frameworkModules,
-			dexLocations:     frameworkLocations,
-			dexLocationsDeps: append(artLocations, frameworkLocations...),
-		}
-
 		configs := map[string]*bootImageConfig{
-			artBootImageName:         &artCfg,
-			frameworkBootImageName:   &frameworkCfg,
-			artJZBootImageName:       &artJZCfg,
-			frameworkJZBootImageName: &frameworkJZCfg,
+			artBootImageName:       &artCfg,
+			frameworkBootImageName: &frameworkCfg,
 		}
 
 		// common to all configs
@@ -249,11 +168,6 @@
 		frameworkCfg.primaryImages = artCfg.images
 		frameworkCfg.imageLocations = append(artCfg.imageLocations, frameworkCfg.imageLocations...)
 
-		// specific to the jitzygote-framework config
-		frameworkJZCfg.dexPathsDeps = append(artJZCfg.dexPathsDeps, frameworkJZCfg.dexPathsDeps...)
-		frameworkJZCfg.primaryImages = artJZCfg.images
-		frameworkJZCfg.imageLocations = append(artJZCfg.imageLocations, frameworkJZCfg.imageLocations...)
-
 		return configs
 	}).(map[string]*bootImageConfig)
 }
@@ -266,17 +180,9 @@
 	return *genBootImageConfigs(ctx)[frameworkBootImageName]
 }
 
-func artJZBootImageConfig(ctx android.PathContext) bootImageConfig {
-	return *genBootImageConfigs(ctx)[artJZBootImageName]
-}
-
-func frameworkJZBootImageConfig(ctx android.PathContext) bootImageConfig {
-	return *genBootImageConfigs(ctx)[frameworkJZBootImageName]
-}
-
 func defaultBootclasspath(ctx android.PathContext) []string {
 	return ctx.Config().OnceStringSlice(defaultBootclasspathKey, func() []string {
-		global := dexpreoptGlobalConfig(ctx)
+		global := dexpreopt.GetGlobalConfig(ctx)
 		image := defaultBootImageConfig(ctx)
 
 		updatableBootclasspath := make([]string, len(global.UpdatableBootJars))
diff --git a/java/droiddoc.go b/java/droiddoc.go
index 098400b..6b39314 100644
--- a/java/droiddoc.go
+++ b/java/droiddoc.go
@@ -534,6 +534,9 @@
 		ctx.AddMissingDependencies(sdkDep.java9Classpath)
 	} else if sdkDep.useFiles {
 		deps.bootClasspath = append(deps.bootClasspath, sdkDep.jars...)
+		deps.aidlPreprocess = sdkDep.aidl
+	} else {
+		deps.aidlPreprocess = sdkDep.aidl
 	}
 
 	ctx.VisitDirectDeps(func(module android.Module) {
@@ -602,11 +605,8 @@
 				continue
 			}
 			packageName := strings.ReplaceAll(filepath.Dir(src.Rel()), "/", ".")
-			for _, pkg := range filterPackages {
-				if strings.HasPrefix(packageName, pkg) {
-					filtered = append(filtered, src)
-					break
-				}
+			if android.HasAnyPrefix(packageName, filterPackages) {
+				filtered = append(filtered, src)
 			}
 		}
 		return filtered
diff --git a/java/java.go b/java/java.go
index dd44d06..c3e2c96 100644
--- a/java/java.go
+++ b/java/java.go
@@ -23,12 +23,14 @@
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync"
 
 	"github.com/google/blueprint"
 	"github.com/google/blueprint/pathtools"
 	"github.com/google/blueprint/proptools"
 
 	"android/soong/android"
+	"android/soong/dexpreopt"
 	"android/soong/java/config"
 	"android/soong/tradefed"
 )
@@ -52,6 +54,8 @@
 			PropertyName: "java_tests",
 		},
 	})
+
+	android.PostDepsMutators(RegisterPostDepsMutators)
 }
 
 func RegisterJavaBuildComponents(ctx android.RegistrationContext) {
@@ -72,10 +76,52 @@
 	ctx.RegisterModuleType("java_host_for_device", HostForDeviceFactory)
 	ctx.RegisterModuleType("dex_import", DexImportFactory)
 
+	ctx.FinalDepsMutators(func(ctx android.RegisterMutatorsContext) {
+		ctx.BottomUp("dexpreopt_tool_deps", dexpreoptToolDepsMutator).Parallel()
+	})
+
 	ctx.RegisterSingletonType("logtags", LogtagsSingleton)
 	ctx.RegisterSingletonType("kythe_java_extract", kytheExtractJavaFactory)
 }
 
+func RegisterPostDepsMutators(ctx android.RegisterMutatorsContext) {
+	ctx.BottomUp("ordered_system_server_jars", systemServerJarsDepsMutator)
+}
+
+var (
+	dexpreoptedSystemServerJarsKey  = android.NewOnceKey("dexpreoptedSystemServerJars")
+	dexpreoptedSystemServerJarsLock sync.Mutex
+)
+
+func DexpreoptedSystemServerJars(config android.Config) *[]string {
+	return config.Once(dexpreoptedSystemServerJarsKey, func() interface{} {
+		return &[]string{}
+	}).(*[]string)
+}
+
+// A PostDepsMutator pass that enforces total order on non-updatable system server jars. A total
+// order is neededed because such jars must be dexpreopted together (each jar on the list must have
+// all preceding jars in its class loader context). The total order must be compatible with the
+// partial order imposed by genuine dependencies between system server jars (which is not always
+// respected by the PRODUCT_SYSTEM_SERVER_JARS variable).
+//
+// An earlier mutator pass creates genuine dependencies, and this pass traverses the jars in that
+// order (which is partial and non-deterministic). This pass adds additional dependencies between
+// jars, making the order total and deterministic. It also constructs a global ordered list.
+func systemServerJarsDepsMutator(ctx android.BottomUpMutatorContext) {
+	jars := dexpreopt.NonUpdatableSystemServerJars(ctx, dexpreopt.GetGlobalConfig(ctx))
+	name := ctx.ModuleName()
+	if android.InList(name, jars) {
+		dexpreoptedSystemServerJarsLock.Lock()
+		defer dexpreoptedSystemServerJarsLock.Unlock()
+		jars := DexpreoptedSystemServerJars(ctx.Config())
+		for _, dep := range *jars {
+			ctx.AddDependency(ctx.Module(), dexpreopt.SystemServerDepTag, dep)
+		}
+		*jars = append(*jars, name)
+	}
+}
+
 func (j *Module) checkSdkVersion(ctx android.ModuleContext) {
 	if j.SocSpecific() || j.DeviceSpecific() ||
 		(j.ProductSpecific() && ctx.Config().EnforceProductPartitionInterface()) {
@@ -659,6 +705,11 @@
 	} else if j.shouldInstrumentStatic(ctx) {
 		ctx.AddVariationDependencies(nil, staticLibTag, "jacocoagent")
 	}
+
+	// services depend on com.android.location.provider, but dependency in not registered in a Blueprint file
+	if ctx.ModuleName() == "services" {
+		ctx.AddDependency(ctx.Module(), dexpreopt.SystemServerForcedDepTag, "com.android.location.provider")
+	}
 }
 
 func hasSrcExt(srcs []string, ext string) bool {
@@ -756,6 +807,7 @@
 	javaSdk
 	javaSystem
 	javaModule
+	javaSystemServer
 	javaPlatform
 )
 
@@ -789,6 +841,10 @@
 		return javaModule, true
 	case ver.kind == sdkModule:
 		return javaModule, false
+	case name == "services-stubs":
+		return javaSystemServer, true
+	case ver.kind == sdkSystemServer:
+		return javaSystemServer, false
 	case ver.kind == sdkPrivate || ver.kind == sdkNone || ver.kind == sdkCorePlatform:
 		return javaPlatform, false
 	case !ver.valid():
@@ -824,17 +880,23 @@
 		}
 		break
 	case javaSystem:
-		if otherLinkType == javaPlatform || otherLinkType == javaModule {
+		if otherLinkType == javaPlatform || otherLinkType == javaModule || otherLinkType == javaSystemServer {
 			ctx.ModuleErrorf("compiles against system API, but dependency %q is compiling against private API."+commonMessage,
 				ctx.OtherModuleName(to))
 		}
 		break
 	case javaModule:
-		if otherLinkType == javaPlatform {
+		if otherLinkType == javaPlatform || otherLinkType == javaSystemServer {
 			ctx.ModuleErrorf("compiles against module API, but dependency %q is compiling against private API."+commonMessage,
 				ctx.OtherModuleName(to))
 		}
 		break
+	case javaSystemServer:
+		if otherLinkType == javaPlatform {
+			ctx.ModuleErrorf("compiles against system server API, but dependency %q is compiling against private API."+commonMessage,
+				ctx.OtherModuleName(to))
+		}
+		break
 	case javaPlatform:
 		// no restriction on link-type
 		break
@@ -1475,6 +1537,16 @@
 
 	j.implementationAndResourcesJar = implementationAndResourcesJar
 
+	// Enable dex compilation for the APEX variants, unless it is disabled explicitly
+	if android.DirectlyInAnyApex(ctx, ctx.ModuleName()) && !j.IsForPlatform() {
+		if j.deviceProperties.Compile_dex == nil {
+			j.deviceProperties.Compile_dex = proptools.BoolPtr(true)
+		}
+		if j.deviceProperties.Hostdex == nil {
+			j.deviceProperties.Hostdex = proptools.BoolPtr(true)
+		}
+	}
+
 	if ctx.Device() && j.hasCode(ctx) &&
 		(Bool(j.properties.Installable) || Bool(j.deviceProperties.Compile_dex)) {
 		// Dex compilation
@@ -1724,6 +1796,10 @@
 	return j.jacocoReportClassesFile
 }
 
+func (j *Module) IsInstallable() bool {
+	return Bool(j.properties.Installable)
+}
+
 //
 // Java libraries (.jar file)
 //
@@ -1761,7 +1837,6 @@
 	j.checkSdkVersion(ctx)
 	j.dexpreopter.installPath = android.PathForModuleInstall(ctx, "framework", j.Stem()+".jar")
 	j.dexpreopter.isSDKLibrary = j.deviceProperties.IsSDKLibrary
-	j.dexpreopter.isInstallable = Bool(j.properties.Installable)
 	j.dexpreopter.uncompressedDex = shouldUncompressDex(ctx, &j.dexpreopter)
 	j.deviceProperties.UncompressDex = j.dexpreopter.uncompressedDex
 	j.compile(ctx, nil)
@@ -2518,13 +2593,16 @@
 	return proptools.StringDefault(j.properties.Stem, j.ModuleBase.Name())
 }
 
+func (j *DexImport) IsInstallable() bool {
+	return true
+}
+
 func (j *DexImport) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	if len(j.properties.Jars) != 1 {
 		ctx.PropertyErrorf("jars", "exactly one jar must be provided")
 	}
 
 	j.dexpreopter.installPath = android.PathForModuleInstall(ctx, "framework", j.Stem()+".jar")
-	j.dexpreopter.isInstallable = true
 	j.dexpreopter.uncompressedDex = shouldUncompressDex(ctx, &j.dexpreopter)
 
 	inputJar := ctx.ExpandSource(j.properties.Jars[0], "jars")
diff --git a/java/java_test.go b/java/java_test.go
index 8815c09..a2226b5 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -57,7 +57,15 @@
 }
 
 func testConfig(env map[string]string, bp string, fs map[string][]byte) android.Config {
-	return TestConfig(buildDir, env, bp, fs)
+	bp += dexpreopt.BpToolModulesForTest()
+
+	config := TestConfig(buildDir, env, bp, fs)
+
+	// Set up the global Once cache used for dexpreopt.GlobalSoongConfig, so that
+	// it doesn't create a real one, which would fail.
+	_ = dexpreopt.GlobalSoongConfigForTests(config)
+
+	return config
 }
 
 func testContext() *android.TestContext {
@@ -86,6 +94,8 @@
 	cc.RegisterRequiredBuildComponentsForTest(ctx)
 	ctx.RegisterModuleType("ndk_prebuilt_shared_stl", cc.NdkPrebuiltSharedStlFactory)
 
+	dexpreopt.RegisterToolModulesForTest(ctx)
+
 	return ctx
 }
 
@@ -93,7 +103,7 @@
 	t.Helper()
 
 	pathCtx := android.PathContextForTesting(config)
-	setDexpreoptTestGlobalConfig(config, dexpreopt.GlobalConfigForTests(pathCtx))
+	dexpreopt.SetTestGlobalConfig(config, dexpreopt.GlobalConfigForTests(pathCtx))
 
 	ctx.Register(config)
 	_, errs := ctx.ParseBlueprintsFiles("Android.bp")
@@ -112,7 +122,7 @@
 	ctx := testContext()
 
 	pathCtx := android.PathContextForTesting(config)
-	setDexpreoptTestGlobalConfig(config, dexpreopt.GlobalConfigForTests(pathCtx))
+	dexpreopt.SetTestGlobalConfig(config, dexpreopt.GlobalConfigForTests(pathCtx))
 
 	ctx.Register(config)
 	_, errs := ctx.ParseBlueprintsFiles("Android.bp")
@@ -1112,9 +1122,9 @@
 	ctx.ModuleForTests("foo"+sdkStubsLibrarySuffix, "android_common")
 	ctx.ModuleForTests("foo"+sdkStubsLibrarySuffix+sdkSystemApiSuffix, "android_common")
 	ctx.ModuleForTests("foo"+sdkStubsLibrarySuffix+sdkTestApiSuffix, "android_common")
-	ctx.ModuleForTests("foo"+sdkDocsSuffix, "android_common")
-	ctx.ModuleForTests("foo"+sdkDocsSuffix+sdkSystemApiSuffix, "android_common")
-	ctx.ModuleForTests("foo"+sdkDocsSuffix+sdkTestApiSuffix, "android_common")
+	ctx.ModuleForTests("foo"+sdkStubsSourceSuffix, "android_common")
+	ctx.ModuleForTests("foo"+sdkStubsSourceSuffix+sdkSystemApiSuffix, "android_common")
+	ctx.ModuleForTests("foo"+sdkStubsSourceSuffix+sdkTestApiSuffix, "android_common")
 	ctx.ModuleForTests("foo"+sdkXmlFileSuffix, "android_arm64_armv8-a")
 	ctx.ModuleForTests("foo.api.public.28", "")
 	ctx.ModuleForTests("foo.api.system.28", "")
diff --git a/java/sdk.go b/java/sdk.go
index 1c047a3..1e60d67 100644
--- a/java/sdk.go
+++ b/java/sdk.go
@@ -72,6 +72,7 @@
 	sdkSystem
 	sdkTest
 	sdkModule
+	sdkSystemServer
 	sdkPrivate
 )
 
@@ -94,6 +95,8 @@
 		return "core_platform"
 	case sdkModule:
 		return "module"
+	case sdkSystemServer:
+		return "system_server"
 	default:
 		return "invalid"
 	}
@@ -261,6 +264,8 @@
 			kind = sdkTest
 		case "module":
 			kind = sdkModule
+		case "system_server":
+			kind = sdkSystemServer
 		default:
 			return sdkSpec{sdkInvalid, sdkVersionNone, str}
 		}
@@ -324,13 +329,13 @@
 		}
 	}
 
-	toModule := func(m, r string, aidl android.Path) sdkDep {
+	toModule := func(modules []string, res string, aidl android.Path) sdkDep {
 		return sdkDep{
 			useModule:          true,
-			bootclasspath:      []string{m, config.DefaultLambdaStubsLibrary},
+			bootclasspath:      append(modules, config.DefaultLambdaStubsLibrary),
 			systemModules:      "core-current-stubs-system-modules",
-			java9Classpath:     []string{m},
-			frameworkResModule: r,
+			java9Classpath:     modules,
+			frameworkResModule: res,
 			aidl:               android.OptionalPathForPath(aidl),
 		}
 	}
@@ -380,16 +385,19 @@
 			noFrameworksLibs:   true,
 		}
 	case sdkPublic:
-		return toModule("android_stubs_current", "framework-res", sdkFrameworkAidlPath(ctx))
+		return toModule([]string{"android_stubs_current"}, "framework-res", sdkFrameworkAidlPath(ctx))
 	case sdkSystem:
-		return toModule("android_system_stubs_current", "framework-res", sdkFrameworkAidlPath(ctx))
+		return toModule([]string{"android_system_stubs_current"}, "framework-res", sdkFrameworkAidlPath(ctx))
 	case sdkTest:
-		return toModule("android_test_stubs_current", "framework-res", sdkFrameworkAidlPath(ctx))
+		return toModule([]string{"android_test_stubs_current"}, "framework-res", sdkFrameworkAidlPath(ctx))
 	case sdkCore:
-		return toModule("core.current.stubs", "", nil)
+		return toModule([]string{"core.current.stubs"}, "", nil)
 	case sdkModule:
 		// TODO(146757305): provide .apk and .aidl that have more APIs for modules
-		return toModule("android_module_lib_stubs_current", "framework-res", sdkFrameworkAidlPath(ctx))
+		return toModule([]string{"android_module_lib_stubs_current"}, "framework-res", sdkFrameworkAidlPath(ctx))
+	case sdkSystemServer:
+		// TODO(146757305): provide .apk and .aidl that have more APIs for modules
+		return toModule([]string{"android_module_lib_stubs_current", "services-stubs"}, "framework-res", sdkFrameworkAidlPath(ctx))
 	default:
 		panic(fmt.Errorf("invalid sdk %q", sdkVersion.raw))
 	}
diff --git a/java/sdk_library.go b/java/sdk_library.go
index f1c565f..4f4029a 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -34,7 +34,7 @@
 	sdkStubsLibrarySuffix = ".stubs"
 	sdkSystemApiSuffix    = ".system"
 	sdkTestApiSuffix      = ".test"
-	sdkDocsSuffix         = ".docs"
+	sdkStubsSourceSuffix  = ".stubs.source"
 	sdkXmlFileSuffix      = ".xml"
 	permissionsTemplate   = `<?xml version="1.0" encoding="utf-8"?>\n` +
 		`<!-- Copyright (C) 2018 The Android Open Source Project\n` +
@@ -109,7 +109,7 @@
 }
 
 func (scope *apiScope) docsModuleName(baseName string) string {
-	return baseName + sdkDocsSuffix + scope.moduleSuffix
+	return baseName + sdkStubsSourceSuffix + scope.moduleSuffix
 }
 
 type apiScopes []*apiScope
@@ -455,6 +455,7 @@
 		Installable         *bool
 		Sdk_version         *string
 		System_modules      *string
+		Patch_module        *string
 		Libs                []string
 		Soc_specific        *bool
 		Device_specific     *bool
@@ -479,6 +480,7 @@
 	sdkVersion := module.sdkVersionForStubsLibrary(mctx, apiScope)
 	props.Sdk_version = proptools.StringPtr(sdkVersion)
 	props.System_modules = module.Library.Module.deviceProperties.System_modules
+	props.Patch_module = module.Library.Module.properties.Patch_module
 	props.Installable = proptools.BoolPtr(false)
 	props.Libs = module.sdkLibraryProperties.Stub_only_libs
 	props.Product_variables.Pdk.Enabled = proptools.BoolPtr(false)
@@ -897,7 +899,7 @@
 
 	module.AddProperties(&module.properties)
 
-	android.InitPrebuiltModule(module, &[]string{})
+	android.InitPrebuiltModule(module, &[]string{""})
 	InitJavaModule(module, android.HostAndDeviceSupported)
 
 	android.AddLoadHook(module, func(mctx android.LoadHookContext) { module.createInternalModules(mctx) })
diff --git a/java/sdk_test.go b/java/sdk_test.go
index c815fe3..ea6733d 100644
--- a/java/sdk_test.go
+++ b/java/sdk_test.go
@@ -212,7 +212,6 @@
 			aidl:           "-pprebuilts/sdk/29/public/framework.aidl",
 		},
 		{
-
 			name:           "module_current",
 			properties:     `sdk_version: "module_current",`,
 			bootclasspath:  []string{"android_module_lib_stubs_current", "core-lambda-stubs"},
@@ -220,6 +219,14 @@
 			java9classpath: []string{"android_module_lib_stubs_current"},
 			aidl:           "-p" + buildDir + "/framework.aidl",
 		},
+		{
+			name:           "system_server_current",
+			properties:     `sdk_version: "system_server_current",`,
+			bootclasspath:  []string{"android_module_lib_stubs_current", "services-stubs", "core-lambda-stubs"},
+			system:         "core-current-stubs-system-modules",
+			java9classpath: []string{"android_module_lib_stubs_current", "services-stubs"},
+			aidl:           "-p" + buildDir + "/framework.aidl",
+		},
 	}
 
 	for _, testcase := range classpathTestcases {
diff --git a/java/testing.go b/java/testing.go
index 8f979c7..3111109 100644
--- a/java/testing.go
+++ b/java/testing.go
@@ -147,6 +147,7 @@
 		"android_system_stubs_current",
 		"android_test_stubs_current",
 		"android_module_lib_stubs_current",
+		"services-stubs",
 		"core.current.stubs",
 		"core.platform.api.stubs",
 		"kotlin-stdlib",
diff --git a/rust/rust.go b/rust/rust.go
index e4f85f0..de6512c 100644
--- a/rust/rust.go
+++ b/rust/rust.go
@@ -354,11 +354,6 @@
 	return nil
 }
 
-func (mod *Module) AllStaticDeps() []string {
-	// TODO(jiyong): do this for rust?
-	return nil
-}
-
 func (mod *Module) Module() android.Module {
 	return mod
 }
@@ -623,21 +618,24 @@
 			linkFile := ccDep.OutputFile()
 			linkPath := linkPathFromFilePath(linkFile.Path())
 			libName := libNameFromFilePath(linkFile.Path())
+			depFlag := "-l" + libName
+
 			if !linkFile.Valid() {
 				ctx.ModuleErrorf("Invalid output file when adding dep %q to %q", depName, ctx.ModuleName())
 			}
 
 			exportDep := false
-
 			switch depTag {
 			case cc.StaticDepTag:
+				depFlag = "-lstatic=" + libName
 				depPaths.linkDirs = append(depPaths.linkDirs, linkPath)
-				depPaths.depFlags = append(depPaths.depFlags, "-l"+libName)
+				depPaths.depFlags = append(depPaths.depFlags, depFlag)
 				directStaticLibDeps = append(directStaticLibDeps, ccDep)
 				mod.Properties.AndroidMkStaticLibs = append(mod.Properties.AndroidMkStaticLibs, depName)
 			case cc.SharedDepTag:
+				depFlag = "-ldylib=" + libName
 				depPaths.linkDirs = append(depPaths.linkDirs, linkPath)
-				depPaths.depFlags = append(depPaths.depFlags, "-l"+libName)
+				depPaths.depFlags = append(depPaths.depFlags, depFlag)
 				directSharedLibDeps = append(directSharedLibDeps, ccDep)
 				mod.Properties.AndroidMkSharedLibs = append(mod.Properties.AndroidMkSharedLibs, depName)
 				exportDep = true
@@ -650,10 +648,10 @@
 			// Make sure these dependencies are propagated
 			if lib, ok := mod.compiler.(*libraryDecorator); ok && exportDep {
 				lib.linkDirs = append(lib.linkDirs, linkPath)
-				lib.depFlags = append(lib.depFlags, "-l"+libName)
+				lib.depFlags = append(lib.depFlags, depFlag)
 			} else if procMacro, ok := mod.compiler.(*procMacroDecorator); ok && exportDep {
 				procMacro.linkDirs = append(procMacro.linkDirs, linkPath)
-				procMacro.depFlags = append(procMacro.depFlags, "-l"+libName)
+				procMacro.depFlags = append(procMacro.depFlags, depFlag)
 			}
 
 		}
diff --git a/scripts/manifest_fixer.py b/scripts/manifest_fixer.py
index 945bc18..c59732b 100755
--- a/scripts/manifest_fixer.py
+++ b/scripts/manifest_fixer.py
@@ -51,6 +51,9 @@
                       help='specify additional <uses-library> tag to add. android:requred is set to false')
   parser.add_argument('--uses-non-sdk-api', dest='uses_non_sdk_api', action='store_true',
                       help='manifest is for a package built against the platform')
+  parser.add_argument('--logging-parent', dest='logging_parent', default='',
+                      help=('specify logging parent as an additional <meta-data> tag. '
+                            'This value is ignored if the logging_parent meta-data tag is present.'))
   parser.add_argument('--use-embedded-dex', dest='use_embedded_dex', action='store_true',
                       help=('specify if the app wants to use embedded dex and avoid extracted,'
                             'locally compiled code. Must not conflict if already declared '
@@ -124,6 +127,52 @@
     element.setAttributeNode(target_attr)
 
 
+def add_logging_parent(doc, logging_parent_value):
+  """Add logging parent as an additional <meta-data> tag.
+
+  Args:
+    doc: The XML document. May be modified by this function.
+    logging_parent_value: A string representing the logging
+      parent value.
+  Raises:
+    RuntimeError: Invalid manifest
+  """
+  manifest = parse_manifest(doc)
+
+  logging_parent_key = 'android.content.pm.LOGGING_PARENT'
+  elems = get_children_with_tag(manifest, 'application')
+  application = elems[0] if len(elems) == 1 else None
+  if len(elems) > 1:
+    raise RuntimeError('found multiple <application> tags')
+  elif not elems:
+    application = doc.createElement('application')
+    indent = get_indent(manifest.firstChild, 1)
+    first = manifest.firstChild
+    manifest.insertBefore(doc.createTextNode(indent), first)
+    manifest.insertBefore(application, first)
+
+  indent = get_indent(application.firstChild, 2)
+
+  last = application.lastChild
+  if last is not None and last.nodeType != minidom.Node.TEXT_NODE:
+    last = None
+
+  if not find_child_with_attribute(application, 'meta-data', android_ns,
+                                   'name', logging_parent_key):
+    ul = doc.createElement('meta-data')
+    ul.setAttributeNS(android_ns, 'android:name', logging_parent_key)
+    ul.setAttributeNS(android_ns, 'android:value', logging_parent_value)
+    application.insertBefore(doc.createTextNode(indent), last)
+    application.insertBefore(ul, last)
+    last = application.lastChild
+
+  # align the closing tag with the opening tag if it's not
+  # indented
+  if last and last.nodeType != minidom.Node.TEXT_NODE:
+    indent = get_indent(application.previousSibling, 1)
+    application.appendChild(doc.createTextNode(indent))
+
+
 def add_uses_libraries(doc, new_uses_libraries, required):
   """Add additional <uses-library> tags
 
@@ -291,6 +340,9 @@
     if args.uses_non_sdk_api:
       add_uses_non_sdk_api(doc)
 
+    if args.logging_parent:
+      add_logging_parent(doc, args.logging_parent)
+
     if args.use_embedded_dex:
       add_use_embedded_dex(doc)
 
diff --git a/scripts/manifest_fixer_test.py b/scripts/manifest_fixer_test.py
index ea8095e..d6e7f26 100755
--- a/scripts/manifest_fixer_test.py
+++ b/scripts/manifest_fixer_test.py
@@ -226,6 +226,47 @@
     self.assertEqual(output, expected)
 
 
+class AddLoggingParentTest(unittest.TestCase):
+  """Unit tests for add_logging_parent function."""
+
+  def add_logging_parent_test(self, input_manifest, logging_parent=None):
+    doc = minidom.parseString(input_manifest)
+    if logging_parent:
+      manifest_fixer.add_logging_parent(doc, logging_parent)
+    output = StringIO.StringIO()
+    manifest_fixer.write_xml(output, doc)
+    return output.getvalue()
+
+  manifest_tmpl = (
+      '<?xml version="1.0" encoding="utf-8"?>\n'
+      '<manifest xmlns:android="http://schemas.android.com/apk/res/android">\n'
+      '%s'
+      '</manifest>\n')
+
+  def uses_logging_parent(self, logging_parent=None):
+    attrs = ''
+    if logging_parent:
+      meta_text = ('<meta-data android:name="android.content.pm.LOGGING_PARENT" '
+                   'android:value="%s"/>\n') % (logging_parent)
+      attrs += '    <application>\n        %s    </application>\n' % (meta_text)
+
+    return attrs
+
+  def test_no_logging_parent(self):
+    """Tests manifest_fixer with no logging_parent."""
+    manifest_input = self.manifest_tmpl % ''
+    expected = self.manifest_tmpl % self.uses_logging_parent()
+    output = self.add_logging_parent_test(manifest_input)
+    self.assertEqual(output, expected)
+
+  def test_logging_parent(self):
+    """Tests manifest_fixer with no logging_parent."""
+    manifest_input = self.manifest_tmpl % ''
+    expected = self.manifest_tmpl % self.uses_logging_parent('FOO')
+    output = self.add_logging_parent_test(manifest_input, 'FOO')
+    self.assertEqual(output, expected)
+
+
 class AddUsesLibrariesTest(unittest.TestCase):
   """Unit tests for add_uses_libraries function."""
 
diff --git a/sdk/java_sdk_test.go b/sdk/java_sdk_test.go
index 79d3c26..0737e5e 100644
--- a/sdk/java_sdk_test.go
+++ b/sdk/java_sdk_test.go
@@ -588,12 +588,13 @@
 	result := testSdkWithJava(t, `
 		sdk {
 			name: "mysdk",
+			java_header_libs: ["exported-system-module"],
 			java_system_modules: ["my-system-modules"],
 		}
 
 		java_system_modules {
 			name: "my-system-modules",
-			libs: ["system-module"],
+			libs: ["system-module", "exported-system-module"],
 		}
 
 		java_library {
@@ -602,6 +603,13 @@
 			sdk_version: "none",
 			system_modules: "none",
 		}
+
+		java_library {
+			name: "exported-system-module",
+			srcs: ["Test.java"],
+			sdk_version: "none",
+			system_modules: "none",
+		}
 	`)
 
 	result.CheckSnapshot("mysdk", "android_common", "",
@@ -609,35 +617,59 @@
 // This is auto-generated. DO NOT EDIT.
 
 java_import {
+    name: "mysdk_exported-system-module@current",
+    sdk_member_name: "exported-system-module",
+    jars: ["java/exported-system-module.jar"],
+}
+
+java_import {
+    name: "exported-system-module",
+    prefer: false,
+    jars: ["java/exported-system-module.jar"],
+}
+
+java_import {
     name: "mysdk_system-module@current",
     sdk_member_name: "system-module",
+    visibility: ["//visibility:private"],
     jars: ["java/system-module.jar"],
 }
 
 java_import {
-    name: "system-module",
+    name: "mysdk_system-module",
     prefer: false,
+    visibility: ["//visibility:private"],
     jars: ["java/system-module.jar"],
 }
 
 java_system_modules_import {
     name: "mysdk_my-system-modules@current",
     sdk_member_name: "my-system-modules",
-    libs: ["mysdk_system-module@current"],
+    libs: [
+        "mysdk_system-module@current",
+        "mysdk_exported-system-module@current",
+    ],
 }
 
 java_system_modules_import {
     name: "my-system-modules",
     prefer: false,
-    libs: ["system-module"],
+    libs: [
+        "mysdk_system-module",
+        "exported-system-module",
+    ],
 }
 
 sdk_snapshot {
     name: "mysdk@current",
+    java_header_libs: ["mysdk_exported-system-module@current"],
     java_system_modules: ["mysdk_my-system-modules@current"],
 }
 `),
-		checkAllCopyRules(".intermediates/system-module/android_common/turbine-combined/system-module.jar -> java/system-module.jar"),
+		checkAllCopyRules(`
+.intermediates/exported-system-module/android_common/turbine-combined/exported-system-module.jar -> java/exported-system-module.jar
+.intermediates/system-module/android_common/turbine-combined/system-module.jar -> java/system-module.jar
+`),
 	)
 }
 
@@ -677,14 +709,16 @@
 java_import {
     name: "mysdk_system-module@current",
     sdk_member_name: "system-module",
+    visibility: ["//visibility:private"],
     device_supported: false,
     host_supported: true,
     jars: ["java/system-module.jar"],
 }
 
 java_import {
-    name: "system-module",
+    name: "mysdk_system-module",
     prefer: false,
+    visibility: ["//visibility:private"],
     device_supported: false,
     host_supported: true,
     jars: ["java/system-module.jar"],
@@ -703,7 +737,7 @@
     prefer: false,
     device_supported: false,
     host_supported: true,
-    libs: ["system-module"],
+    libs: ["mysdk_system-module"],
 }
 
 sdk_snapshot {
diff --git a/sdk/sdk.go b/sdk/sdk.go
index f22763c..dbe9ce2 100644
--- a/sdk/sdk.go
+++ b/sdk/sdk.go
@@ -50,6 +50,9 @@
 	// list properties, e.g. java_libs.
 	dynamicMemberTypeListProperties interface{}
 
+	// The set of exported members.
+	exportedMembers map[string]struct{}
+
 	properties sdkProperties
 
 	snapshotFile android.OptionalPath
@@ -217,6 +220,33 @@
 	return s
 }
 
+func (s *sdk) memberListProperties() []*sdkMemberListProperty {
+	return s.dynamicSdkMemberTypes.memberListProperties
+}
+
+func (s *sdk) getExportedMembers() map[string]struct{} {
+	if s.exportedMembers == nil {
+		// Collect all the exported members.
+		s.exportedMembers = make(map[string]struct{})
+
+		for _, memberListProperty := range s.memberListProperties() {
+			names := memberListProperty.getter(s.dynamicMemberTypeListProperties)
+
+			// Every member specified explicitly in the properties is exported by the sdk.
+			for _, name := range names {
+				s.exportedMembers[name] = struct{}{}
+			}
+		}
+	}
+
+	return s.exportedMembers
+}
+
+func (s *sdk) isInternalMember(memberName string) bool {
+	_, ok := s.getExportedMembers()[memberName]
+	return !ok
+}
+
 func (s *sdk) snapshot() bool {
 	return s.properties.Snapshot
 }
@@ -290,7 +320,7 @@
 // Step 1: create dependencies from an SDK module to its members.
 func memberMutator(mctx android.BottomUpMutatorContext) {
 	if s, ok := mctx.Module().(*sdk); ok {
-		for _, memberListProperty := range s.dynamicSdkMemberTypes.memberListProperties {
+		for _, memberListProperty := range s.memberListProperties() {
 			names := memberListProperty.getter(s.dynamicMemberTypeListProperties)
 			tag := memberListProperty.dependencyTag
 			memberListProperty.memberType.AddDependencies(mctx, tag, names)
diff --git a/sdk/update.go b/sdk/update.go
index 9032d1f..ff567be 100644
--- a/sdk/update.go
+++ b/sdk/update.go
@@ -130,7 +130,9 @@
 				byType[memberType] = append(byType[memberType], member)
 			}
 
-			member.variants = append(member.variants, child.(android.SdkAware))
+			// Only append new variants to the list. This is needed because a member can be both
+			// exported by the sdk and also be a transitive sdk member.
+			member.variants = appendUniqueVariants(member.variants, child.(android.SdkAware))
 
 			// If the member type supports transitive sdk members then recurse down into
 			// its dependencies, otherwise exit traversal.
@@ -141,7 +143,7 @@
 	})
 
 	var members []*sdkMember
-	for _, memberListProperty := range s.dynamicSdkMemberTypes.memberListProperties {
+	for _, memberListProperty := range s.memberListProperties() {
 		membersOfType := byType[memberListProperty.memberType]
 		members = append(members, membersOfType...)
 	}
@@ -149,6 +151,15 @@
 	return members
 }
 
+func appendUniqueVariants(variants []android.SdkAware, newVariant android.SdkAware) []android.SdkAware {
+	for _, v := range variants {
+		if v == newVariant {
+			return variants
+		}
+	}
+	return append(variants, newVariant)
+}
+
 // SDK directory structure
 // <sdk_root>/
 //     Android.bp   : definition of a 'sdk' module is here. This is a hand-made one.
@@ -203,17 +214,20 @@
 	// Create a transformer that will transform an unversioned module into a versioned module.
 	unversionedToVersionedTransformer := unversionedToVersionedTransformation{builder: builder}
 
+	// Create a transformer that will transform an unversioned module by replacing any references
+	// to internal members with a unique module name and setting prefer: false.
+	unversionedTransformer := unversionedTransformation{builder: builder}
+
 	for _, unversioned := range builder.prebuiltOrder {
 		// Copy the unversioned module so it can be modified to make it versioned.
 		versioned := unversioned.deepCopy()
 
 		// Transform the unversioned module into a versioned one.
 		versioned.transform(unversionedToVersionedTransformer)
-
 		bpFile.AddModule(versioned)
 
-		// Set prefer: false - this is not strictly required as that is the default.
-		unversioned.insertAfter("name", "prefer", false)
+		// Transform the unversioned module to make it suitable for use in the snapshot.
+		unversioned.transform(unversionedTransformer)
 		bpFile.AddModule(unversioned)
 	}
 
@@ -235,7 +249,7 @@
 	}
 
 	addHostDeviceSupportedProperties(&s.ModuleBase, snapshotModule)
-	for _, memberListProperty := range s.dynamicSdkMemberTypes.memberListProperties {
+	for _, memberListProperty := range s.memberListProperties() {
 		names := memberListProperty.getter(s.dynamicMemberTypeListProperties)
 		if len(names) > 0 {
 			snapshotModule.AddProperty(memberListProperty.propertyName(), builder.versionedSdkMemberNames(names))
@@ -319,6 +333,30 @@
 	}
 }
 
+type unversionedTransformation struct {
+	identityTransformation
+	builder *snapshotBuilder
+}
+
+func (t unversionedTransformation) transformModule(module *bpModule) *bpModule {
+	// If the module is an internal member then use a unique name for it.
+	name := module.getValue("name").(string)
+	module.setProperty("name", t.builder.unversionedSdkMemberName(name))
+
+	// Set prefer: false - this is not strictly required as that is the default.
+	module.insertAfter("name", "prefer", false)
+
+	return module
+}
+
+func (t unversionedTransformation) transformProperty(name string, value interface{}, tag android.BpPropertyTag) (interface{}, android.BpPropertyTag) {
+	if tag == sdkMemberReferencePropertyTag {
+		return t.builder.unversionedSdkMemberNames(value.([]string)), tag
+	} else {
+		return value, tag
+	}
+}
+
 func generateBpContents(contents *generatedContents, bpFile *bpFile) {
 	contents.Printfln("// This is auto-generated. DO NOT EDIT.")
 	for _, bpModule := range bpFile.order {
@@ -442,11 +480,17 @@
 	m := s.bpFile.newModule(moduleType)
 	m.AddProperty("name", name)
 
-	// Extract visibility information from a member variant. All variants have the same
-	// visibility so it doesn't matter which one is used.
-	visibility := android.EffectiveVisibilityRules(s.ctx, member.Variants()[0])
-	if len(visibility) != 0 {
-		m.AddProperty("visibility", visibility)
+	if s.sdk.isInternalMember(name) {
+		// An internal member is only referenced from the sdk snapshot which is in the
+		// same package so can be marked as private.
+		m.AddProperty("visibility", []string{"//visibility:private"})
+	} else {
+		// Extract visibility information from a member variant. All variants have the same
+		// visibility so it doesn't matter which one is used.
+		visibility := android.EffectiveVisibilityRules(s.ctx, member.Variants()[0])
+		if len(visibility) != 0 {
+			m.AddProperty("visibility", visibility)
+		}
 	}
 
 	addHostDeviceSupportedProperties(&s.sdk.ModuleBase, m)
@@ -482,6 +526,23 @@
 	return references
 }
 
+// Get an internal name unique to the sdk.
+func (s *snapshotBuilder) unversionedSdkMemberName(unversionedName string) string {
+	if s.sdk.isInternalMember(unversionedName) {
+		return s.ctx.ModuleName() + "_" + unversionedName
+	} else {
+		return unversionedName
+	}
+}
+
+func (s *snapshotBuilder) unversionedSdkMemberNames(members []string) []string {
+	var references []string = nil
+	for _, m := range members {
+		references = append(references, s.unversionedSdkMemberName(m))
+	}
+	return references
+}
+
 var _ android.SdkMember = (*sdkMember)(nil)
 
 type sdkMember struct {
diff --git a/tradefed/autogen.go b/tradefed/autogen.go
index c35d8b9..a46dce9 100644
--- a/tradefed/autogen.go
+++ b/tradefed/autogen.go
@@ -44,17 +44,16 @@
 	CommandDeps: []string{"$template"},
 }, "name", "template", "extraConfigs")
 
-func testConfigPath(ctx android.ModuleContext, prop *string, testSuites []string, autoGenConfig *bool) (path android.Path, autogenPath android.WritablePath) {
+func testConfigPath(ctx android.ModuleContext, prop *string, testSuites []string, autoGenConfig *bool, testConfigTemplateProp *string) (path android.Path, autogenPath android.WritablePath) {
 	p := getTestConfig(ctx, prop)
 	if !Bool(autoGenConfig) && p != nil {
 		return p, nil
-	} else if !android.InList("cts", testSuites) && BoolDefault(autoGenConfig, true) {
+	} else if BoolDefault(autoGenConfig, true) && (!android.InList("cts", testSuites) || testConfigTemplateProp != nil) {
 		outputFile := android.PathForModuleOut(ctx, ctx.ModuleName()+".config")
 		return nil, outputFile
 	} else {
 		// CTS modules can be used for test data, so test config files must be
-		// explicitly created using AndroidTest.xml
-		// TODO(b/112602712): remove the path check
+		// explicitly created using AndroidTest.xml or test_config_template.
 		return nil, nil
 	}
 }
@@ -130,7 +129,7 @@
 
 func AutoGenNativeTestConfig(ctx android.ModuleContext, testConfigProp *string,
 	testConfigTemplateProp *string, testSuites []string, config []Config, autoGenConfig *bool) android.Path {
-	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig)
+	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig, testConfigTemplateProp)
 	if autogenPath != nil {
 		templatePath := getTestConfigTemplate(ctx, testConfigTemplateProp)
 		if templatePath.Valid() {
@@ -149,7 +148,7 @@
 
 func AutoGenNativeBenchmarkTestConfig(ctx android.ModuleContext, testConfigProp *string,
 	testConfigTemplateProp *string, testSuites []string, configs []Config, autoGenConfig *bool) android.Path {
-	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig)
+	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig, testConfigTemplateProp)
 	if autogenPath != nil {
 		templatePath := getTestConfigTemplate(ctx, testConfigTemplateProp)
 		if templatePath.Valid() {
@@ -164,7 +163,7 @@
 
 func AutoGenJavaTestConfig(ctx android.ModuleContext, testConfigProp *string, testConfigTemplateProp *string,
 	testSuites []string, autoGenConfig *bool) android.Path {
-	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig)
+	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig, testConfigTemplateProp)
 	if autogenPath != nil {
 		templatePath := getTestConfigTemplate(ctx, testConfigTemplateProp)
 		if templatePath.Valid() {
@@ -184,7 +183,7 @@
 func AutoGenPythonBinaryHostTestConfig(ctx android.ModuleContext, testConfigProp *string,
 	testConfigTemplateProp *string, testSuites []string, autoGenConfig *bool) android.Path {
 
-	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig)
+	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig, testConfigTemplateProp)
 	if autogenPath != nil {
 		templatePath := getTestConfigTemplate(ctx, testConfigTemplateProp)
 		if templatePath.Valid() {
@@ -199,7 +198,7 @@
 
 func AutoGenRustTestConfig(ctx android.ModuleContext, name string, testConfigProp *string,
 	testConfigTemplateProp *string, testSuites []string, autoGenConfig *bool) android.Path {
-	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig)
+	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig, testConfigTemplateProp)
 	if autogenPath != nil {
 		templatePathString := "${RustHostTestConfigTemplate}"
 		if ctx.Device() {
@@ -226,7 +225,7 @@
 
 func AutoGenInstrumentationTestConfig(ctx android.ModuleContext, testConfigProp *string,
 	testConfigTemplateProp *string, manifest android.Path, testSuites []string, autoGenConfig *bool) android.Path {
-	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig)
+	path, autogenPath := testConfigPath(ctx, testConfigProp, testSuites, autoGenConfig, testConfigTemplateProp)
 	if autogenPath != nil {
 		template := "${InstrumentationTestConfigTemplate}"
 		moduleTemplate := getTestConfigTemplate(ctx, testConfigTemplateProp)
diff --git a/ui/build/cleanbuild.go b/ui/build/cleanbuild.go
index 1c4f574..36d4f04 100644
--- a/ui/build/cleanbuild.go
+++ b/ui/build/cleanbuild.go
@@ -237,6 +237,7 @@
 			if fi.IsDir() {
 				if err := os.Remove(old); err == nil {
 					ctx.Println("Removed directory that is no longer installed: ", old)
+					cleanEmptyDirs(ctx, filepath.Dir(old))
 				} else {
 					ctx.Println("Failed to remove directory that is no longer installed (%q): %v", old, err)
 					ctx.Println("It's recommended to run `m installclean`")
@@ -244,6 +245,7 @@
 			} else {
 				if err := os.Remove(old); err == nil {
 					ctx.Println("Removed file that is no longer installed: ", old)
+					cleanEmptyDirs(ctx, filepath.Dir(old))
 				} else if !os.IsNotExist(err) {
 					ctx.Fatalf("Failed to remove file that is no longer installed (%q): %v", old, err)
 				}
@@ -254,3 +256,16 @@
 	// Use the new list as the base for the next build
 	os.Rename(file, oldFile)
 }
+
+func cleanEmptyDirs(ctx Context, dir string) {
+	files, err := ioutil.ReadDir(dir)
+	if err != nil || len(files) > 0 {
+		return
+	}
+	if err := os.Remove(dir); err == nil {
+		ctx.Println("Removed directory that is no longer installed: ", dir)
+	} else {
+		ctx.Fatalf("Failed to remove directory that is no longer installed (%q): %v", dir, err)
+	}
+	cleanEmptyDirs(ctx, filepath.Dir(dir))
+}