Merge "Revert "Revert "Allow libz to have stub even though it's not an ...""
diff --git a/android/module.go b/android/module.go
index 7e64f0a..45477ea 100644
--- a/android/module.go
+++ b/android/module.go
@@ -104,6 +104,8 @@
 type BaseModuleContext interface {
 	EarlyModuleContext
 
+	blueprintBaseModuleContext() blueprint.BaseModuleContext
+
 	OtherModuleName(m blueprint.Module) string
 	OtherModuleDir(m blueprint.Module) string
 	OtherModuleErrorf(m blueprint.Module, fmt string, args ...interface{})
@@ -1439,6 +1441,10 @@
 	return b.bp.GetDirectDepWithTag(name, tag)
 }
 
+func (b *baseModuleContext) blueprintBaseModuleContext() blueprint.BaseModuleContext {
+	return b.bp
+}
+
 type moduleContext struct {
 	bp blueprint.ModuleContext
 	baseModuleContext
@@ -2361,3 +2367,8 @@
 	Installed_paths   []string `json:"installed,omitempty"`
 	SrcJars           []string `json:"srcjars,omitempty"`
 }
+
+func CheckBlueprintSyntax(ctx BaseModuleContext, filename string, contents string) []error {
+	bpctx := ctx.blueprintBaseModuleContext()
+	return blueprint.CheckBlueprintSyntax(bpctx.ModuleFactories(), filename, contents)
+}
diff --git a/apex/apex.go b/apex/apex.go
index 4b59c6d..9659c3f 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -1848,6 +1848,51 @@
 	}
 }
 
+// Ensures that a lib providing stub isn't statically linked
+func (a *apexBundle) checkStaticLinkingToStubLibraries(ctx android.ModuleContext) {
+	// Practically, we only care about regular APEXes on the device.
+	if ctx.Host() || a.testApex || a.vndkApex {
+		return
+	}
+
+	a.walkPayloadDeps(ctx, func(ctx android.ModuleContext, from blueprint.Module, to android.ApexModule, externalDep bool) bool {
+		if ccm, ok := to.(*cc.Module); ok {
+			apexName := ctx.ModuleName()
+			fromName := ctx.OtherModuleName(from)
+			toName := ctx.OtherModuleName(to)
+
+			// If `to` is not actually in the same APEX as `from` then it does not need apex_available and neither
+			// do any of its dependencies.
+			if am, ok := from.(android.DepIsInSameApex); ok && !am.DepIsInSameApex(ctx, to) {
+				// As soon as the dependency graph crosses the APEX boundary, don't go further.
+				return false
+			}
+
+			// TODO(jiyong) remove this check when R is published to AOSP. Currently, libstatssocket
+			// is capable of providing a stub variant, but is being statically linked from the bluetooth
+			// APEX.
+			if toName == "libstatssocket" {
+				return false
+			}
+
+			// The dynamic linker and crash_dump tool in the runtime APEX is the only exception to this rule.
+			// It can't make the static dependencies dynamic because it can't
+			// do the dynamic linking for itself.
+			if apexName == "com.android.runtime" && (fromName == "linker" || fromName == "crash_dump") {
+				return false
+			}
+
+			isStubLibraryFromOtherApex := ccm.HasStubsVariants() && !android.DirectlyInApex(apexName, toName)
+			if isStubLibraryFromOtherApex && !externalDep {
+				ctx.ModuleErrorf("%q required by %q is a native library providing stub. "+
+					"It shouldn't be included in this APEX via static linking. Dependency path: %s", to.String(), fromName, ctx.GetPathString(false))
+			}
+
+		}
+		return true
+	})
+}
+
 func (a *apexBundle) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	buildFlattenedAsDefault := ctx.Config().FlattenApex() && !ctx.Config().UnbundledBuild()
 	switch a.properties.ApexType {
@@ -1885,6 +1930,7 @@
 
 	a.checkApexAvailability(ctx)
 	a.checkUpdatable(ctx)
+	a.checkStaticLinkingToStubLibraries(ctx)
 
 	handleSpecialLibs := !android.Bool(a.properties.Ignore_system_library_special_case)
 
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 5461deb..2d3f52f 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -4833,6 +4833,42 @@
 	}
 }
 
+func TestNoStaticLinkingToStubsLib(t *testing.T) {
+	testApexError(t, `.*required by "mylib" is a native library providing stub.*`, `
+		apex {
+			name: "myapex",
+			key: "myapex.key",
+			native_shared_libs: ["mylib"],
+		}
+
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+
+		cc_library {
+			name: "mylib",
+			srcs: ["mylib.cpp"],
+			static_libs: ["otherlib"],
+			system_shared_libs: [],
+			stl: "none",
+			apex_available: [ "myapex" ],
+		}
+
+		cc_library {
+			name: "otherlib",
+			srcs: ["mylib.cpp"],
+			system_shared_libs: [],
+			stl: "none",
+			stubs: {
+				versions: ["1", "2", "3"],
+			},
+			apex_available: [ "myapex" ],
+		}
+	`)
+}
+
 func TestMain(m *testing.M) {
 	run := func() int {
 		setUp()
diff --git a/cc/cc.go b/cc/cc.go
index 6bf022d..b97dba9 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -2881,6 +2881,9 @@
 				return false
 			}
 		}
+	} else if ctx.OtherModuleDependencyTag(dep) == llndkImplDep {
+		// We don't track beyond LLNDK
+		return false
 	}
 	return true
 }
diff --git a/java/java.go b/java/java.go
index d943a3a..5b1dcd7 100644
--- a/java/java.go
+++ b/java/java.go
@@ -643,13 +643,15 @@
 			}
 		} else if sdkDep.useModule {
 			ctx.AddVariationDependencies(nil, bootClasspathTag, sdkDep.bootclasspath...)
-			ctx.AddVariationDependencies(nil, systemModulesTag, sdkDep.systemModules)
 			ctx.AddVariationDependencies(nil, java9LibTag, sdkDep.java9Classpath...)
 			if j.deviceProperties.EffectiveOptimizeEnabled() && sdkDep.hasStandardLibs() {
 				ctx.AddVariationDependencies(nil, proguardRaiseTag, config.DefaultBootclasspathLibraries...)
 				ctx.AddVariationDependencies(nil, proguardRaiseTag, config.DefaultLibraries...)
 			}
 		}
+		if sdkDep.systemModules != "" {
+			ctx.AddVariationDependencies(nil, systemModulesTag, sdkDep.systemModules)
+		}
 
 		if ctx.ModuleName() == "android_stubs_current" ||
 			ctx.ModuleName() == "android_system_stubs_current" ||
@@ -1052,19 +1054,10 @@
 }
 
 func getJavaVersion(ctx android.ModuleContext, javaVersion string, sdkContext sdkContext) javaVersion {
-	sdk, err := sdkContext.sdkVersion().effectiveVersion(ctx)
-	if err != nil {
-		ctx.PropertyErrorf("sdk_version", "%s", err)
-	}
 	if javaVersion != "" {
 		return normalizeJavaVersion(ctx, javaVersion)
-	} else if ctx.Device() && sdk <= 23 {
-		return JAVA_VERSION_7
-	} else if ctx.Device() && sdk <= 29 {
-		return JAVA_VERSION_8
-	} else if ctx.Device() && ctx.Config().UnbundledBuildUsePrebuiltSdks() {
-		// TODO(b/142896162): once we have prebuilt system modules we can use 1.9 for unbundled builds
-		return JAVA_VERSION_8
+	} else if ctx.Device() {
+		return sdkContext.sdkVersion().defaultJavaLanguageVersion(ctx)
 	} else {
 		return JAVA_VERSION_9
 	}
diff --git a/java/prebuilt_apis.go b/java/prebuilt_apis.go
index 03bc76b..999c72f 100644
--- a/java/prebuilt_apis.go
+++ b/java/prebuilt_apis.go
@@ -15,11 +15,12 @@
 package java
 
 import (
-	"android/soong/android"
 	"sort"
 	"strings"
 
 	"github.com/google/blueprint/proptools"
+
+	"android/soong/android"
 )
 
 func init() {
@@ -69,6 +70,10 @@
 	return
 }
 
+func prebuiltApiModuleName(mctx android.LoadHookContext, module string, scope string, apiver string) string {
+	return mctx.ModuleName() + "_" + scope + "_" + apiver + "_" + module
+}
+
 func createImport(mctx android.LoadHookContext, module string, scope string, apiver string, path string) {
 	props := struct {
 		Name        *string
@@ -76,7 +81,7 @@
 		Sdk_version *string
 		Installable *bool
 	}{}
-	props.Name = proptools.StringPtr(mctx.ModuleName() + "_" + scope + "_" + apiver + "_" + module)
+	props.Name = proptools.StringPtr(prebuiltApiModuleName(mctx, module, scope, apiver))
 	props.Jars = append(props.Jars, path)
 	// TODO(hansson): change to scope after migration is done.
 	props.Sdk_version = proptools.StringPtr("current")
@@ -124,6 +129,27 @@
 	}
 }
 
+func createSystemModules(mctx android.LoadHookContext, apiver string) {
+	props := struct {
+		Name *string
+		Libs []string
+	}{}
+	props.Name = proptools.StringPtr(prebuiltApiModuleName(mctx, "system_modules", "public", apiver))
+	props.Libs = append(props.Libs, prebuiltApiModuleName(mctx, "core-for-system-modules", "public", apiver))
+
+	mctx.CreateModule(SystemModulesFactory, &props)
+}
+
+func prebuiltSdkSystemModules(mctx android.LoadHookContext) {
+	for _, apiver := range mctx.Module().(*prebuiltApis).properties.Api_dirs {
+		jar := android.ExistentPathForSource(mctx,
+			mctx.ModuleDir(), apiver, "public", "core-for-system-modules.jar")
+		if jar.Valid() {
+			createSystemModules(mctx, apiver)
+		}
+	}
+}
+
 func prebuiltApiFiles(mctx android.LoadHookContext) {
 	mydir := mctx.ModuleDir() + "/"
 	// <apiver>/<scope>/api/<module>.txt
@@ -178,6 +204,7 @@
 	if _, ok := mctx.Module().(*prebuiltApis); ok {
 		prebuiltApiFiles(mctx)
 		prebuiltSdkStubs(mctx)
+		prebuiltSdkSystemModules(mctx)
 	}
 }
 
@@ -191,7 +218,9 @@
 // Similarly, it generates a java_import for all API .jar files found under the
 // directory where the Android.bp is located. Specifically, an API file located
 // at ./<ver>/<scope>/api/<module>.jar generates a java_import module named
-// <prebuilt-api-module>.<scope>.<ver>.<module>.
+// <prebuilt-api-module>_<scope>_<ver>_<module>, and for SDK versions >= 30
+// a java_system_modules module named
+// <prebuilt-api-module>_public_<ver>_system_modules
 func PrebuiltApisFactory() android.Module {
 	module := &prebuiltApis{}
 	module.AddProperties(&module.properties)
diff --git a/java/sdk.go b/java/sdk.go
index 690451c..9310f78 100644
--- a/java/sdk.go
+++ b/java/sdk.go
@@ -252,6 +252,20 @@
 	return ver.String(), err
 }
 
+func (s sdkSpec) defaultJavaLanguageVersion(ctx android.EarlyModuleContext) javaVersion {
+	sdk, err := s.effectiveVersion(ctx)
+	if err != nil {
+		ctx.PropertyErrorf("sdk_version", "%s", err)
+	}
+	if sdk <= 23 {
+		return JAVA_VERSION_7
+	} else if sdk <= 29 {
+		return JAVA_VERSION_8
+	} else {
+		return JAVA_VERSION_9
+	}
+}
+
 func sdkSpecFrom(str string) sdkSpec {
 	switch str {
 	// special cases first
@@ -370,10 +384,16 @@
 			return sdkDep{}
 		}
 
+		var systemModules string
+		if sdkVersion.defaultJavaLanguageVersion(ctx).usesJavaModules() {
+			systemModules = "sdk_public_" + sdkVersion.version.String() + "_system_modules"
+		}
+
 		return sdkDep{
-			useFiles: true,
-			jars:     android.Paths{jarPath.Path(), lambdaStubsPath},
-			aidl:     android.OptionalPathForPath(aidlPath.Path()),
+			useFiles:      true,
+			jars:          android.Paths{jarPath.Path(), lambdaStubsPath},
+			aidl:          android.OptionalPathForPath(aidlPath.Path()),
+			systemModules: systemModules,
 		}
 	}
 
diff --git a/java/sdk_test.go b/java/sdk_test.go
index 088db9e..fb86463 100644
--- a/java/sdk_test.go
+++ b/java/sdk_test.go
@@ -83,6 +83,16 @@
 		},
 		{
 
+			name:           "sdk v30",
+			properties:     `sdk_version: "30",`,
+			bootclasspath:  []string{`""`},
+			system:         "sdk_public_30_system_modules",
+			java8classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			java9classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			aidl:           "-pprebuilts/sdk/30/public/framework.aidl",
+		},
+		{
+
 			name:           "current",
 			properties:     `sdk_version: "current",`,
 			bootclasspath:  []string{"android_stubs_current", "core-lambda-stubs"},
@@ -110,6 +120,16 @@
 		},
 		{
 
+			name:           "system_30",
+			properties:     `sdk_version: "system_30",`,
+			bootclasspath:  []string{`""`},
+			system:         "sdk_public_30_system_modules",
+			java8classpath: []string{"prebuilts/sdk/30/system/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			java9classpath: []string{"prebuilts/sdk/30/system/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			aidl:           "-pprebuilts/sdk/30/public/framework.aidl",
+		},
+		{
+
 			name:           "test_current",
 			properties:     `sdk_version: "test_current",`,
 			bootclasspath:  []string{"android_test_stubs_current", "core-lambda-stubs"},
@@ -176,12 +196,24 @@
 		},
 		{
 
+			name:           "unbundled sdk v30",
+			unbundled:      true,
+			properties:     `sdk_version: "30",`,
+			bootclasspath:  []string{`""`},
+			system:         "sdk_public_30_system_modules",
+			java8classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			java9classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			aidl:           "-pprebuilts/sdk/30/public/framework.aidl",
+		},
+		{
+
 			name:           "unbundled current",
 			unbundled:      true,
 			properties:     `sdk_version: "current",`,
 			bootclasspath:  []string{`""`},
-			forces8:        true,
+			system:         "sdk_public_current_system_modules",
 			java8classpath: []string{"prebuilts/sdk/current/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			java9classpath: []string{"prebuilts/sdk/current/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
 			aidl:           "-pprebuilts/sdk/current/public/framework.aidl",
 		},
 
@@ -189,27 +221,30 @@
 			name:           "pdk default",
 			pdk:            true,
 			bootclasspath:  []string{`""`},
-			forces8:        true,
-			java8classpath: []string{"prebuilts/sdk/29/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
-			aidl:           "-pprebuilts/sdk/29/public/framework.aidl",
+			system:         "sdk_public_30_system_modules",
+			java8classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			java9classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			aidl:           "-pprebuilts/sdk/30/public/framework.aidl",
 		},
 		{
 			name:           "pdk current",
 			pdk:            true,
 			properties:     `sdk_version: "current",`,
 			bootclasspath:  []string{`""`},
-			forces8:        true,
-			java8classpath: []string{"prebuilts/sdk/29/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
-			aidl:           "-pprebuilts/sdk/29/public/framework.aidl",
+			system:         "sdk_public_30_system_modules",
+			java8classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			java9classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			aidl:           "-pprebuilts/sdk/30/public/framework.aidl",
 		},
 		{
 			name:           "pdk 29",
 			pdk:            true,
 			properties:     `sdk_version: "29",`,
 			bootclasspath:  []string{`""`},
-			forces8:        true,
-			java8classpath: []string{"prebuilts/sdk/29/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
-			aidl:           "-pprebuilts/sdk/29/public/framework.aidl",
+			system:         "sdk_public_30_system_modules",
+			java8classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			java9classpath: []string{"prebuilts/sdk/30/public/android.jar", "prebuilts/sdk/tools/core-lambda-stubs.jar"},
+			aidl:           "-pprebuilts/sdk/30/public/framework.aidl",
 		},
 		{
 			name:           "module_current",
@@ -292,12 +327,16 @@
 			if testcase.system == "none" {
 				system = "--system=none"
 			} else if testcase.system != "" {
-				system = "--system=" + filepath.Join(buildDir, ".intermediates", testcase.system, "android_common", "system")
+				dir := ""
+				if strings.HasPrefix(testcase.system, "sdk_public_") {
+					dir = "prebuilts/sdk"
+				}
+				system = "--system=" + filepath.Join(buildDir, ".intermediates", dir, testcase.system, "android_common", "system")
 				// The module-relative parts of these paths are hardcoded in system_modules.go:
 				systemDeps = []string{
-					filepath.Join(buildDir, ".intermediates", testcase.system, "android_common", "system", "lib", "modules"),
-					filepath.Join(buildDir, ".intermediates", testcase.system, "android_common", "system", "lib", "jrt-fs.jar"),
-					filepath.Join(buildDir, ".intermediates", testcase.system, "android_common", "system", "release"),
+					filepath.Join(buildDir, ".intermediates", dir, testcase.system, "android_common", "system", "lib", "modules"),
+					filepath.Join(buildDir, ".intermediates", dir, testcase.system, "android_common", "system", "lib", "jrt-fs.jar"),
+					filepath.Join(buildDir, ".intermediates", dir, testcase.system, "android_common", "system", "release"),
 				}
 			}
 
diff --git a/java/testing.go b/java/testing.go
index 53181a0..1967148 100644
--- a/java/testing.go
+++ b/java/testing.go
@@ -55,36 +55,54 @@
 		"assets_a/a":             nil,
 		"assets_b/b":             nil,
 
-		"prebuilts/sdk/14/public/android.jar":         nil,
-		"prebuilts/sdk/14/public/framework.aidl":      nil,
-		"prebuilts/sdk/14/system/android.jar":         nil,
-		"prebuilts/sdk/17/public/android.jar":         nil,
-		"prebuilts/sdk/17/public/framework.aidl":      nil,
-		"prebuilts/sdk/17/system/android.jar":         nil,
-		"prebuilts/sdk/29/public/android.jar":         nil,
-		"prebuilts/sdk/29/public/framework.aidl":      nil,
-		"prebuilts/sdk/29/system/android.jar":         nil,
-		"prebuilts/sdk/29/system/foo.jar":             nil,
-		"prebuilts/sdk/current/core/android.jar":      nil,
-		"prebuilts/sdk/current/public/android.jar":    nil,
-		"prebuilts/sdk/current/public/framework.aidl": nil,
-		"prebuilts/sdk/current/public/core.jar":       nil,
-		"prebuilts/sdk/current/system/android.jar":    nil,
-		"prebuilts/sdk/current/test/android.jar":      nil,
-		"prebuilts/sdk/28/public/api/foo.txt":         nil,
-		"prebuilts/sdk/28/system/api/foo.txt":         nil,
-		"prebuilts/sdk/28/test/api/foo.txt":           nil,
-		"prebuilts/sdk/28/public/api/foo-removed.txt": nil,
-		"prebuilts/sdk/28/system/api/foo-removed.txt": nil,
-		"prebuilts/sdk/28/test/api/foo-removed.txt":   nil,
-		"prebuilts/sdk/28/public/api/bar.txt":         nil,
-		"prebuilts/sdk/28/system/api/bar.txt":         nil,
-		"prebuilts/sdk/28/test/api/bar.txt":           nil,
-		"prebuilts/sdk/28/public/api/bar-removed.txt": nil,
-		"prebuilts/sdk/28/system/api/bar-removed.txt": nil,
-		"prebuilts/sdk/28/test/api/bar-removed.txt":   nil,
-		"prebuilts/sdk/tools/core-lambda-stubs.jar":   nil,
-		"prebuilts/sdk/Android.bp":                    []byte(`prebuilt_apis { name: "sdk", api_dirs: ["14", "28", "current"],}`),
+		"prebuilts/sdk/14/public/android.jar":                      nil,
+		"prebuilts/sdk/14/public/framework.aidl":                   nil,
+		"prebuilts/sdk/14/system/android.jar":                      nil,
+		"prebuilts/sdk/17/public/android.jar":                      nil,
+		"prebuilts/sdk/17/public/framework.aidl":                   nil,
+		"prebuilts/sdk/17/system/android.jar":                      nil,
+		"prebuilts/sdk/29/public/android.jar":                      nil,
+		"prebuilts/sdk/29/public/framework.aidl":                   nil,
+		"prebuilts/sdk/29/system/android.jar":                      nil,
+		"prebuilts/sdk/29/system/foo.jar":                          nil,
+		"prebuilts/sdk/30/public/android.jar":                      nil,
+		"prebuilts/sdk/30/public/framework.aidl":                   nil,
+		"prebuilts/sdk/30/system/android.jar":                      nil,
+		"prebuilts/sdk/30/system/foo.jar":                          nil,
+		"prebuilts/sdk/30/public/core-for-system-modules.jar":      nil,
+		"prebuilts/sdk/current/core/android.jar":                   nil,
+		"prebuilts/sdk/current/public/android.jar":                 nil,
+		"prebuilts/sdk/current/public/framework.aidl":              nil,
+		"prebuilts/sdk/current/public/core.jar":                    nil,
+		"prebuilts/sdk/current/public/core-for-system-modules.jar": nil,
+		"prebuilts/sdk/current/system/android.jar":                 nil,
+		"prebuilts/sdk/current/test/android.jar":                   nil,
+		"prebuilts/sdk/28/public/api/foo.txt":                      nil,
+		"prebuilts/sdk/28/system/api/foo.txt":                      nil,
+		"prebuilts/sdk/28/test/api/foo.txt":                        nil,
+		"prebuilts/sdk/28/public/api/foo-removed.txt":              nil,
+		"prebuilts/sdk/28/system/api/foo-removed.txt":              nil,
+		"prebuilts/sdk/28/test/api/foo-removed.txt":                nil,
+		"prebuilts/sdk/28/public/api/bar.txt":                      nil,
+		"prebuilts/sdk/28/system/api/bar.txt":                      nil,
+		"prebuilts/sdk/28/test/api/bar.txt":                        nil,
+		"prebuilts/sdk/28/public/api/bar-removed.txt":              nil,
+		"prebuilts/sdk/28/system/api/bar-removed.txt":              nil,
+		"prebuilts/sdk/28/test/api/bar-removed.txt":                nil,
+		"prebuilts/sdk/30/public/api/foo.txt":                      nil,
+		"prebuilts/sdk/30/system/api/foo.txt":                      nil,
+		"prebuilts/sdk/30/test/api/foo.txt":                        nil,
+		"prebuilts/sdk/30/public/api/foo-removed.txt":              nil,
+		"prebuilts/sdk/30/system/api/foo-removed.txt":              nil,
+		"prebuilts/sdk/30/test/api/foo-removed.txt":                nil,
+		"prebuilts/sdk/30/public/api/bar.txt":                      nil,
+		"prebuilts/sdk/30/system/api/bar.txt":                      nil,
+		"prebuilts/sdk/30/test/api/bar.txt":                        nil,
+		"prebuilts/sdk/30/public/api/bar-removed.txt":              nil,
+		"prebuilts/sdk/30/system/api/bar-removed.txt":              nil,
+		"prebuilts/sdk/30/test/api/bar-removed.txt":                nil,
+		"prebuilts/sdk/tools/core-lambda-stubs.jar":                nil,
+		"prebuilts/sdk/Android.bp":                                 []byte(`prebuilt_apis { name: "sdk", api_dirs: ["14", "28", "30", "current"],}`),
 
 		"prebuilts/apk/app.apk":        nil,
 		"prebuilts/apk/app_arm.apk":    nil,
diff --git a/sdk/update.go b/sdk/update.go
index 476a4a5..1ba5806 100644
--- a/sdk/update.go
+++ b/sdk/update.go
@@ -350,6 +350,9 @@
 	bp = newGeneratedFile(ctx, "snapshot", "Android.bp")
 	generateBpContents(&bp.generatedContents, bpFile)
 
+	contents := bp.content.String()
+	syntaxCheckSnapshotBpFile(ctx, contents)
+
 	bp.build(pctx, ctx, nil)
 
 	filesToZip := builder.filesToZip
@@ -394,6 +397,36 @@
 	return outputZipFile
 }
 
+// Check the syntax of the generated Android.bp file contents and if they are
+// invalid then log an error with the contents (tagged with line numbers) and the
+// errors that were found so that it is easy to see where the problem lies.
+func syntaxCheckSnapshotBpFile(ctx android.ModuleContext, contents string) {
+	errs := android.CheckBlueprintSyntax(ctx, "Android.bp", contents)
+	if len(errs) != 0 {
+		message := &strings.Builder{}
+		_, _ = fmt.Fprint(message, `errors in generated Android.bp snapshot:
+
+Generated Android.bp contents
+========================================================================
+`)
+		for i, line := range strings.Split(contents, "\n") {
+			_, _ = fmt.Fprintf(message, "%6d:    %s\n", i+1, line)
+		}
+
+		_, _ = fmt.Fprint(message, `
+========================================================================
+
+Errors found:
+`)
+
+		for _, err := range errs {
+			_, _ = fmt.Fprintf(message, "%s\n", err.Error())
+		}
+
+		ctx.ModuleErrorf("%s", message.String())
+	}
+}
+
 func extractCommonProperties(ctx android.ModuleContext, extractor *commonValueExtractor, commonProperties interface{}, inputPropertiesSlice interface{}) {
 	err := extractor.extractCommonProperties(commonProperties, inputPropertiesSlice)
 	if err != nil {
diff --git a/ui/build/ninja.go b/ui/build/ninja.go
index 1b13e5d..fa44cb1 100644
--- a/ui/build/ninja.go
+++ b/ui/build/ninja.go
@@ -39,6 +39,7 @@
 	args := []string{
 		"-d", "keepdepfile",
 		"-d", "keeprsp",
+		"-d", "stats",
 		"--frontend_file", fifo,
 	}
 
diff --git a/ui/build/soong.go b/ui/build/soong.go
index 2fbf381..6a12add 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -119,6 +119,7 @@
 		cmd := Command(ctx, config, "soong "+name,
 			config.PrebuiltBuildTool("ninja"),
 			"-d", "keepdepfile",
+			"-d", "stats",
 			"-o", "usesphonyoutputs=yes",
 			"-o", "preremoveoutputs=yes",
 			"-w", "dupbuild=err",
diff --git a/ui/status/ninja.go b/ui/status/ninja.go
index 9cf2f6a..a11774c 100644
--- a/ui/status/ninja.go
+++ b/ui/status/ninja.go
@@ -174,6 +174,8 @@
 				n.status.Print("warning: " + message)
 			case ninja_frontend.Status_Message_ERROR:
 				n.status.Error(message)
+			case ninja_frontend.Status_Message_DEBUG:
+				n.status.Verbose(message)
 			default:
 				n.status.Print(message)
 			}
diff --git a/ui/status/ninja_frontend/frontend.pb.go b/ui/status/ninja_frontend/frontend.pb.go
index 7c05eed..7ba9de2 100644
--- a/ui/status/ninja_frontend/frontend.pb.go
+++ b/ui/status/ninja_frontend/frontend.pb.go
@@ -3,9 +3,11 @@
 
 package ninja_frontend
 
-import proto "github.com/golang/protobuf/proto"
-import fmt "fmt"
-import math "math"
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	math "math"
+)
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
@@ -16,7 +18,7 @@
 // is compatible with the proto package it is being compiled against.
 // A compilation error at this line likely means your copy of the
 // proto package needs to be updated.
-const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
 
 type Status_Message_Level int32
 
@@ -24,17 +26,21 @@
 	Status_Message_INFO    Status_Message_Level = 0
 	Status_Message_WARNING Status_Message_Level = 1
 	Status_Message_ERROR   Status_Message_Level = 2
+	Status_Message_DEBUG   Status_Message_Level = 3
 )
 
 var Status_Message_Level_name = map[int32]string{
 	0: "INFO",
 	1: "WARNING",
 	2: "ERROR",
+	3: "DEBUG",
 }
+
 var Status_Message_Level_value = map[string]int32{
 	"INFO":    0,
 	"WARNING": 1,
 	"ERROR":   2,
+	"DEBUG":   3,
 }
 
 func (x Status_Message_Level) Enum() *Status_Message_Level {
@@ -42,9 +48,11 @@
 	*p = x
 	return p
 }
+
 func (x Status_Message_Level) String() string {
 	return proto.EnumName(Status_Message_Level_name, int32(x))
 }
+
 func (x *Status_Message_Level) UnmarshalJSON(data []byte) error {
 	value, err := proto.UnmarshalJSONEnum(Status_Message_Level_value, data, "Status_Message_Level")
 	if err != nil {
@@ -53,8 +61,9 @@
 	*x = Status_Message_Level(value)
 	return nil
 }
+
 func (Status_Message_Level) EnumDescriptor() ([]byte, []int) {
-	return fileDescriptor_frontend_5a49d9b15a642005, []int{0, 5, 0}
+	return fileDescriptor_eca3873955a29cfe, []int{0, 5, 0}
 }
 
 type Status struct {
@@ -73,16 +82,17 @@
 func (m *Status) String() string { return proto.CompactTextString(m) }
 func (*Status) ProtoMessage()    {}
 func (*Status) Descriptor() ([]byte, []int) {
-	return fileDescriptor_frontend_5a49d9b15a642005, []int{0}
+	return fileDescriptor_eca3873955a29cfe, []int{0}
 }
+
 func (m *Status) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Status.Unmarshal(m, b)
 }
 func (m *Status) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_Status.Marshal(b, m, deterministic)
 }
-func (dst *Status) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Status.Merge(dst, src)
+func (m *Status) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Status.Merge(m, src)
 }
 func (m *Status) XXX_Size() int {
 	return xxx_messageInfo_Status.Size(m)
@@ -147,16 +157,17 @@
 func (m *Status_TotalEdges) String() string { return proto.CompactTextString(m) }
 func (*Status_TotalEdges) ProtoMessage()    {}
 func (*Status_TotalEdges) Descriptor() ([]byte, []int) {
-	return fileDescriptor_frontend_5a49d9b15a642005, []int{0, 0}
+	return fileDescriptor_eca3873955a29cfe, []int{0, 0}
 }
+
 func (m *Status_TotalEdges) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Status_TotalEdges.Unmarshal(m, b)
 }
 func (m *Status_TotalEdges) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_Status_TotalEdges.Marshal(b, m, deterministic)
 }
-func (dst *Status_TotalEdges) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Status_TotalEdges.Merge(dst, src)
+func (m *Status_TotalEdges) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Status_TotalEdges.Merge(m, src)
 }
 func (m *Status_TotalEdges) XXX_Size() int {
 	return xxx_messageInfo_Status_TotalEdges.Size(m)
@@ -188,16 +199,17 @@
 func (m *Status_BuildStarted) String() string { return proto.CompactTextString(m) }
 func (*Status_BuildStarted) ProtoMessage()    {}
 func (*Status_BuildStarted) Descriptor() ([]byte, []int) {
-	return fileDescriptor_frontend_5a49d9b15a642005, []int{0, 1}
+	return fileDescriptor_eca3873955a29cfe, []int{0, 1}
 }
+
 func (m *Status_BuildStarted) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Status_BuildStarted.Unmarshal(m, b)
 }
 func (m *Status_BuildStarted) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_Status_BuildStarted.Marshal(b, m, deterministic)
 }
-func (dst *Status_BuildStarted) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Status_BuildStarted.Merge(dst, src)
+func (m *Status_BuildStarted) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Status_BuildStarted.Merge(m, src)
 }
 func (m *Status_BuildStarted) XXX_Size() int {
 	return xxx_messageInfo_Status_BuildStarted.Size(m)
@@ -232,16 +244,17 @@
 func (m *Status_BuildFinished) String() string { return proto.CompactTextString(m) }
 func (*Status_BuildFinished) ProtoMessage()    {}
 func (*Status_BuildFinished) Descriptor() ([]byte, []int) {
-	return fileDescriptor_frontend_5a49d9b15a642005, []int{0, 2}
+	return fileDescriptor_eca3873955a29cfe, []int{0, 2}
 }
+
 func (m *Status_BuildFinished) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Status_BuildFinished.Unmarshal(m, b)
 }
 func (m *Status_BuildFinished) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_Status_BuildFinished.Marshal(b, m, deterministic)
 }
-func (dst *Status_BuildFinished) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Status_BuildFinished.Merge(dst, src)
+func (m *Status_BuildFinished) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Status_BuildFinished.Merge(m, src)
 }
 func (m *Status_BuildFinished) XXX_Size() int {
 	return xxx_messageInfo_Status_BuildFinished.Size(m)
@@ -276,16 +289,17 @@
 func (m *Status_EdgeStarted) String() string { return proto.CompactTextString(m) }
 func (*Status_EdgeStarted) ProtoMessage()    {}
 func (*Status_EdgeStarted) Descriptor() ([]byte, []int) {
-	return fileDescriptor_frontend_5a49d9b15a642005, []int{0, 3}
+	return fileDescriptor_eca3873955a29cfe, []int{0, 3}
 }
+
 func (m *Status_EdgeStarted) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Status_EdgeStarted.Unmarshal(m, b)
 }
 func (m *Status_EdgeStarted) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_Status_EdgeStarted.Marshal(b, m, deterministic)
 }
-func (dst *Status_EdgeStarted) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Status_EdgeStarted.Merge(dst, src)
+func (m *Status_EdgeStarted) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Status_EdgeStarted.Merge(m, src)
 }
 func (m *Status_EdgeStarted) XXX_Size() int {
 	return xxx_messageInfo_Status_EdgeStarted.Size(m)
@@ -353,7 +367,11 @@
 	// Exit status (0 for success).
 	Status *int32 `protobuf:"zigzag32,3,opt,name=status" json:"status,omitempty"`
 	// Edge output, may contain ANSI codes.
-	Output               *string  `protobuf:"bytes,4,opt,name=output" json:"output,omitempty"`
+	Output *string `protobuf:"bytes,4,opt,name=output" json:"output,omitempty"`
+	// Number of milliseconds spent executing in user mode
+	UserTime *uint32 `protobuf:"varint,5,opt,name=user_time,json=userTime" json:"user_time,omitempty"`
+	// Number of milliseconds spent executing in kernel mode
+	SystemTime           *uint32  `protobuf:"varint,6,opt,name=system_time,json=systemTime" json:"system_time,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -363,16 +381,17 @@
 func (m *Status_EdgeFinished) String() string { return proto.CompactTextString(m) }
 func (*Status_EdgeFinished) ProtoMessage()    {}
 func (*Status_EdgeFinished) Descriptor() ([]byte, []int) {
-	return fileDescriptor_frontend_5a49d9b15a642005, []int{0, 4}
+	return fileDescriptor_eca3873955a29cfe, []int{0, 4}
 }
+
 func (m *Status_EdgeFinished) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Status_EdgeFinished.Unmarshal(m, b)
 }
 func (m *Status_EdgeFinished) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_Status_EdgeFinished.Marshal(b, m, deterministic)
 }
-func (dst *Status_EdgeFinished) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Status_EdgeFinished.Merge(dst, src)
+func (m *Status_EdgeFinished) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Status_EdgeFinished.Merge(m, src)
 }
 func (m *Status_EdgeFinished) XXX_Size() int {
 	return xxx_messageInfo_Status_EdgeFinished.Size(m)
@@ -411,8 +430,22 @@
 	return ""
 }
 
+func (m *Status_EdgeFinished) GetUserTime() uint32 {
+	if m != nil && m.UserTime != nil {
+		return *m.UserTime
+	}
+	return 0
+}
+
+func (m *Status_EdgeFinished) GetSystemTime() uint32 {
+	if m != nil && m.SystemTime != nil {
+		return *m.SystemTime
+	}
+	return 0
+}
+
 type Status_Message struct {
-	// Message priority level (INFO, WARNING, or ERROR).
+	// Message priority level (DEBUG, INFO, WARNING, ERROR).
 	Level *Status_Message_Level `protobuf:"varint,1,opt,name=level,enum=ninja.Status_Message_Level,def=0" json:"level,omitempty"`
 	// Info/warning/error message from Ninja.
 	Message              *string  `protobuf:"bytes,2,opt,name=message" json:"message,omitempty"`
@@ -425,16 +458,17 @@
 func (m *Status_Message) String() string { return proto.CompactTextString(m) }
 func (*Status_Message) ProtoMessage()    {}
 func (*Status_Message) Descriptor() ([]byte, []int) {
-	return fileDescriptor_frontend_5a49d9b15a642005, []int{0, 5}
+	return fileDescriptor_eca3873955a29cfe, []int{0, 5}
 }
+
 func (m *Status_Message) XXX_Unmarshal(b []byte) error {
 	return xxx_messageInfo_Status_Message.Unmarshal(m, b)
 }
 func (m *Status_Message) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
 	return xxx_messageInfo_Status_Message.Marshal(b, m, deterministic)
 }
-func (dst *Status_Message) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Status_Message.Merge(dst, src)
+func (m *Status_Message) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Status_Message.Merge(m, src)
 }
 func (m *Status_Message) XXX_Size() int {
 	return xxx_messageInfo_Status_Message.Size(m)
@@ -462,6 +496,7 @@
 }
 
 func init() {
+	proto.RegisterEnum("ninja.Status_Message_Level", Status_Message_Level_name, Status_Message_Level_value)
 	proto.RegisterType((*Status)(nil), "ninja.Status")
 	proto.RegisterType((*Status_TotalEdges)(nil), "ninja.Status.TotalEdges")
 	proto.RegisterType((*Status_BuildStarted)(nil), "ninja.Status.BuildStarted")
@@ -469,42 +504,46 @@
 	proto.RegisterType((*Status_EdgeStarted)(nil), "ninja.Status.EdgeStarted")
 	proto.RegisterType((*Status_EdgeFinished)(nil), "ninja.Status.EdgeFinished")
 	proto.RegisterType((*Status_Message)(nil), "ninja.Status.Message")
-	proto.RegisterEnum("ninja.Status_Message_Level", Status_Message_Level_name, Status_Message_Level_value)
 }
 
-func init() { proto.RegisterFile("frontend.proto", fileDescriptor_frontend_5a49d9b15a642005) }
+func init() {
+	proto.RegisterFile("frontend.proto", fileDescriptor_eca3873955a29cfe)
+}
 
-var fileDescriptor_frontend_5a49d9b15a642005 = []byte{
-	// 496 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x6c, 0x53, 0xd1, 0x6e, 0xd3, 0x30,
-	0x14, 0xa5, 0x69, 0xd3, 0x34, 0x37, 0x6d, 0x28, 0x96, 0x40, 0x59, 0x10, 0xa2, 0xda, 0xd3, 0x78,
-	0x20, 0x48, 0xbc, 0x20, 0x10, 0x12, 0xa2, 0xd2, 0x06, 0x43, 0xd0, 0x49, 0xde, 0x24, 0x24, 0x5e,
-	0xaa, 0x74, 0xf6, 0x86, 0x51, 0xe2, 0x54, 0xb1, 0xbb, 0x5f, 0xe0, 0x7f, 0x78, 0xe0, 0xfb, 0x90,
-	0xaf, 0xed, 0x2c, 0x65, 0x7b, 0xcb, 0xf1, 0x3d, 0xe7, 0xde, 0x73, 0x8f, 0x1d, 0x48, 0xaf, 0xda,
-	0x46, 0x6a, 0x2e, 0x59, 0xb1, 0x6d, 0x1b, 0xdd, 0x90, 0x50, 0x0a, 0xf9, 0xab, 0x3c, 0xfc, 0x13,
-	0xc1, 0xf8, 0x5c, 0x97, 0x7a, 0xa7, 0xc8, 0x5b, 0x48, 0x74, 0xa3, 0xcb, 0x6a, 0xcd, 0xd9, 0x35,
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-	0x74, 0x38, 0x71, 0x14, 0x6a, 0x67, 0x7a, 0x48, 0xde, 0xc3, 0xd4, 0x38, 0xef, 0x3c, 0x8c, 0xb0,
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-	0x4e, 0xf2, 0xfc, 0x6e, 0xfa, 0xb3, 0x7e, 0xc6, 0xf9, 0x17, 0x98, 0xf6, 0x03, 0x24, 0x0b, 0x48,
-	0xb6, 0x65, 0x5b, 0x56, 0x15, 0xaf, 0x84, 0xaa, 0x9d, 0xa0, 0x7f, 0x44, 0x32, 0x88, 0x6e, 0x78,
-	0xbb, 0x69, 0x14, 0xc7, 0xfb, 0x98, 0x50, 0x0f, 0xf3, 0x87, 0x30, 0xdb, 0x8b, 0x32, 0xff, 0x3b,
-	0x80, 0xa4, 0x17, 0x0d, 0x49, 0x21, 0x10, 0xcc, 0xf5, 0x0c, 0x04, 0x23, 0xcf, 0x00, 0x30, 0xd6,
-	0xb5, 0x16, 0xb5, 0xed, 0x36, 0xa3, 0x31, 0x9e, 0x5c, 0x88, 0x9a, 0x93, 0x27, 0x30, 0x16, 0x72,
-	0xbb, 0xd3, 0x2a, 0x1b, 0x2e, 0x86, 0x47, 0x31, 0x75, 0xc8, 0x38, 0x68, 0x76, 0x1a, 0x0b, 0x23,
-	0x2c, 0x78, 0x48, 0x08, 0x8c, 0x18, 0x57, 0x97, 0x98, 0x72, 0x4c, 0xf1, 0xdb, 0xb0, 0x2f, 0x9b,
-	0xba, 0x2e, 0x25, 0xc3, 0x04, 0x63, 0xea, 0xa1, 0xad, 0x48, 0xd5, 0x54, 0x3c, 0x8b, 0xec, 0x26,
-	0x0e, 0xe6, 0x02, 0xa6, 0xfd, 0x3b, 0xb9, 0x63, 0xfc, 0x00, 0x26, 0x5c, 0xb2, 0xbe, 0xed, 0x88,
-	0x4b, 0xe6, 0x4d, 0x2b, 0xbc, 0x1a, 0x7c, 0x6b, 0x8f, 0xa8, 0x43, 0xe6, 0xdc, 0xba, 0xc4, 0x17,
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-	0x38, 0x29, 0xfd, 0xff, 0x99, 0x3a, 0x56, 0xf1, 0xd5, 0x50, 0xde, 0x8d, 0x4e, 0x57, 0x27, 0x67,
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+var fileDescriptor_eca3873955a29cfe = []byte{
+	// 539 bytes of a gzipped FileDescriptorProto
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 }
diff --git a/ui/status/ninja_frontend/frontend.proto b/ui/status/ninja_frontend/frontend.proto
index 13fd535..baa0046 100644
--- a/ui/status/ninja_frontend/frontend.proto
+++ b/ui/status/ninja_frontend/frontend.proto
@@ -61,6 +61,10 @@
     optional sint32 status = 3;
     // Edge output, may contain ANSI codes.
     optional string output = 4;
+    // Number of milliseconds spent executing in user mode
+    optional uint32 user_time = 5;
+    // Number of milliseconds spent executing in kernel mode
+    optional uint32 system_time = 6;
   }
 
   message Message {
@@ -68,8 +72,9 @@
       INFO = 0;
       WARNING = 1;
       ERROR = 2;
+      DEBUG = 3;
     }
-    // Message priority level (INFO, WARNING, or ERROR).
+    // Message priority level (DEBUG, INFO, WARNING, ERROR).
     optional Level level = 1 [default = INFO];
     // Info/warning/error message from Ninja.
     optional string message = 2;