Merge "Revert "Use proto output instead of jsonproto output for aquery""
diff --git a/.gitignore b/.gitignore
index 45884c4..5d2bc0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 /.idea
 *.iml
+*.ipr
+*.iws
+
diff --git a/android/allowlists/allowlists.go b/android/allowlists/allowlists.go
index 6165239..1cc4d54 100644
--- a/android/allowlists/allowlists.go
+++ b/android/allowlists/allowlists.go
@@ -1334,23 +1334,6 @@
 		"prebuilt_platform-robolectric-4.4-prebuilt",
 		"prebuilt_platform-robolectric-4.5.1-prebuilt",
 		"prebuilt_currysrc_org.eclipse",
-
-		// TODO(b/247782695 and/or b/242847534) Fix mixed build between unconverted gensrcs and converted filegroup
-		"connectivity_service_proto",
-		"data_stall_event_proto",
-		"device_policy_proto",
-		"dns_resolver_proto",
-		"ipconnectivity-proto-src",
-		"launcher_proto",
-		"libstats_atom_enum_protos",
-		"libstats_atom_message_protos",
-		"network_stack_proto",
-		"service-permission-streaming-proto-sources",
-		"srcs_bluetooth_protos",
-		"srcs_bluetooth_leaudio_protos",
-		"style_proto",
-		"tethering_proto",
-		"text_classifier_proto",
 	}
 
 	ProdMixedBuildsEnabledList = []string{
diff --git a/android/bazel_handler.go b/android/bazel_handler.go
index f16ee60..e829326 100644
--- a/android/bazel_handler.go
+++ b/android/bazel_handler.go
@@ -577,7 +577,7 @@
 		"HOME=" + paths.homeDir,
 		pwdPrefix(),
 		"BUILD_DIR=" + absolutePath(paths.soongOutDir),
-		// Make OUT_DIR absolute here so tools/bazel.sh uses the correct
+		// Make OUT_DIR absolute here so build/bazel/bin/bazel uses the correct
 		// OUT_DIR at <root>/out, instead of <root>/out/soong/workspace/out.
 		"OUT_DIR=" + absolutePath(paths.outDir()),
 		// Disables local host detection of gcc; toolchain information is defined
diff --git a/android/filegroup.go b/android/filegroup.go
index 6b11172..af4d89a 100644
--- a/android/filegroup.go
+++ b/android/filegroup.go
@@ -234,7 +234,8 @@
 }
 
 func (fg *fileGroup) IsMixedBuildSupported(ctx BaseModuleContext) bool {
-	return true
+	// TODO(b/247782695), TODO(b/242847534) Fix mixed builds for filegroups
+	return false
 }
 
 func (fg *fileGroup) ProcessBazelQueryResponse(ctx ModuleContext) {
diff --git a/android/filegroup_test.go b/android/filegroup_test.go
index a7ea805..8292d5e 100644
--- a/android/filegroup_test.go
+++ b/android/filegroup_test.go
@@ -6,6 +6,8 @@
 )
 
 func TestFileGroupWithPathProp(t *testing.T) {
+	// TODO(b/247782695), TODO(b/242847534) Fix mixed builds for filegroups
+	t.Skip("Re-enable once filegroups are corrected for mixed builds")
 	outBaseDir := "outputbase"
 	pathPrefix := outBaseDir + "/execroot/__main__"
 	expectedOutputfile := filepath.Join(pathPrefix, "a/b/c/d/test.aidl")
diff --git a/android/makevars.go b/android/makevars.go
index 5165a55..0800190 100644
--- a/android/makevars.go
+++ b/android/makevars.go
@@ -471,7 +471,7 @@
 			fmt.Fprintf(buf, " %s", dep.String())
 		}
 		fmt.Fprintln(buf)
-		fmt.Fprintln(buf, "\t@echo \"Install $@\"")
+		fmt.Fprintln(buf, "\t@echo \"Install: $@\"")
 		fmt.Fprintf(buf, "\trm -f $@ && cp -f %s $< $@\n", preserveSymlinksFlag)
 		if install.executable {
 			fmt.Fprintf(buf, "\tchmod +x $@\n")
@@ -515,7 +515,7 @@
 			fromStr = symlink.absFrom
 		}
 
-		fmt.Fprintln(buf, "\t@echo \"Symlink $@\"")
+		fmt.Fprintln(buf, "\t@echo \"Symlink: $@\"")
 		fmt.Fprintf(buf, "\trm -f $@ && ln -sfn %s $@", fromStr)
 		fmt.Fprintln(buf)
 		fmt.Fprintln(buf)
diff --git a/android/module.go b/android/module.go
index 5aecb05..b41a898 100644
--- a/android/module.go
+++ b/android/module.go
@@ -928,6 +928,8 @@
 	Tags bazel.StringListAttribute
 
 	Applicable_licenses bazel.LabelListAttribute
+
+	Testonly *bool
 }
 
 // constraintAttributes represents Bazel attributes pertaining to build constraints,
diff --git a/android/paths.go b/android/paths.go
index dbcdb23..375297f 100644
--- a/android/paths.go
+++ b/android/paths.go
@@ -1139,6 +1139,21 @@
 	return path
 }
 
+// MaybeExistentPathForSource joins the provided path components and validates that the result
+// neither escapes the source dir nor is in the out dir.
+// It does not validate whether the path exists.
+func MaybeExistentPathForSource(ctx PathContext, pathComponents ...string) SourcePath {
+	path, err := pathForSource(ctx, pathComponents...)
+	if err != nil {
+		reportPathError(ctx, err)
+	}
+
+	if pathtools.IsGlob(path.String()) {
+		ReportPathErrorf(ctx, "path may not contain a glob: %s", path.String())
+	}
+	return path
+}
+
 // ExistentPathForSource returns an OptionalPath with the SourcePath, rooted from SrcDir, *not*
 // rooted from the module's local source directory, if the path exists, or an empty OptionalPath if
 // it doesn't exist. Dependencies are added so that the ninja file will be regenerated if the state
diff --git a/apex/apex.go b/apex/apex.go
index 88a057f..09cdc82 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -17,13 +17,14 @@
 package apex
 
 import (
-	"android/soong/bazel/cquery"
 	"fmt"
 	"path/filepath"
 	"regexp"
 	"sort"
 	"strings"
 
+	"android/soong/bazel/cquery"
+
 	"github.com/google/blueprint"
 	"github.com/google/blueprint/bootstrap"
 	"github.com/google/blueprint/proptools"
@@ -47,7 +48,7 @@
 
 func registerApexBuildComponents(ctx android.RegistrationContext) {
 	ctx.RegisterModuleType("apex", BundleFactory)
-	ctx.RegisterModuleType("apex_test", testApexBundleFactory)
+	ctx.RegisterModuleType("apex_test", TestApexBundleFactory)
 	ctx.RegisterModuleType("apex_vndk", vndkApexBundleFactory)
 	ctx.RegisterModuleType("apex_defaults", defaultsFactory)
 	ctx.RegisterModuleType("prebuilt_apex", PrebuiltFactory)
@@ -2563,7 +2564,7 @@
 
 // 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 {
+func TestApexBundleFactory() android.Module {
 	bundle := newApexBundle()
 	bundle.testApex = true
 	return bundle
@@ -3359,6 +3360,7 @@
 	Compressible          bazel.BoolAttribute
 	Package_name          *string
 	Logging_parent        *string
+	Tests                 bazel.LabelListAttribute
 }
 
 type convertedNativeSharedLibs struct {
@@ -3368,13 +3370,19 @@
 
 // ConvertWithBp2build performs bp2build conversion of an apex
 func (a *apexBundle) ConvertWithBp2build(ctx android.TopDownMutatorContext) {
-	// We do not convert apex_test modules at this time
-	if ctx.ModuleType() != "apex" {
+	// We only convert apex and apex_test modules at this time
+	if ctx.ModuleType() != "apex" && ctx.ModuleType() != "apex_test" {
 		return
 	}
 
 	attrs, props := convertWithBp2build(a, ctx)
-	ctx.CreateBazelTargetModule(props, android.CommonAttributes{Name: a.Name()}, &attrs)
+	commonAttrs := android.CommonAttributes{
+		Name: a.Name(),
+	}
+	if a.testApex {
+		commonAttrs.Testonly = proptools.BoolPtr(a.testApex)
+	}
+	ctx.CreateBazelTargetModule(props, commonAttrs, &attrs)
 }
 
 func convertWithBp2build(a *apexBundle, ctx android.TopDownMutatorContext) (bazelApexBundleAttributes, bazel.BazelTargetModuleProperties) {
@@ -3441,6 +3449,12 @@
 	binaries := android.BazelLabelForModuleDeps(ctx, a.properties.ApexNativeDependencies.Binaries)
 	binariesLabelListAttribute := bazel.MakeLabelListAttribute(binaries)
 
+	var testsAttrs bazel.LabelListAttribute
+	if a.testApex && len(a.properties.ApexNativeDependencies.Tests) > 0 {
+		tests := android.BazelLabelForModuleDeps(ctx, a.properties.ApexNativeDependencies.Tests)
+		testsAttrs = bazel.MakeLabelListAttribute(tests)
+	}
+
 	var updatableAttribute bazel.BoolAttribute
 	if a.properties.Updatable != nil {
 		updatableAttribute.Value = a.properties.Updatable
@@ -3483,6 +3497,7 @@
 		Compressible:          compressibleAttribute,
 		Package_name:          packageName,
 		Logging_parent:        loggingParent,
+		Tests:                 testsAttrs,
 	}
 
 	props := bazel.BazelTargetModuleProperties{
diff --git a/bp2build/apex_conversion_test.go b/bp2build/apex_conversion_test.go
index a666e49..b6061e4 100644
--- a/bp2build/apex_conversion_test.go
+++ b/bp2build/apex_conversion_test.go
@@ -42,6 +42,7 @@
 	ctx.RegisterModuleType("android_app_certificate", java.AndroidAppCertificateFactory)
 	ctx.RegisterModuleType("filegroup", android.FileGroupFactory)
 	ctx.RegisterModuleType("prebuilt_etc", etc.PrebuiltEtcFactory)
+	ctx.RegisterModuleType("cc_test", cc.TestFactory)
 }
 
 func runOverrideApexTestCase(t *testing.T, tc Bp2buildTestCase) {
@@ -1249,3 +1250,28 @@
 			}),
 		}})
 }
+
+func TestApexTestBundleSimple(t *testing.T) {
+	runApexTestCase(t, Bp2buildTestCase{
+		Description:                "apex_test - simple",
+		ModuleTypeUnderTest:        "apex_test",
+		ModuleTypeUnderTestFactory: apex.TestApexBundleFactory,
+		Filesystem:                 map[string]string{},
+		Blueprint: `
+cc_test { name: "cc_test_1", bazel_module: { bp2build_available: false } }
+
+apex_test {
+	name: "test_com.android.apogee",
+	file_contexts: "file_contexts_file",
+	tests: ["cc_test_1"],
+}
+`,
+		ExpectedBazelTargets: []string{
+			MakeBazelTarget("apex", "test_com.android.apogee", AttrNameToString{
+				"file_contexts": `"file_contexts_file"`,
+				"manifest":      `"apex_manifest.json"`,
+				"testonly":      `True`,
+				"tests":         `[":cc_test_1"]`,
+			}),
+		}})
+}
diff --git a/bp2build/symlink_forest.go b/bp2build/symlink_forest.go
index 7c39a11..092b240 100644
--- a/bp2build/symlink_forest.go
+++ b/bp2build/symlink_forest.go
@@ -202,13 +202,13 @@
 		}
 	}
 
-	allEntries := make(map[string]bool)
+	allEntries := make(map[string]struct{})
 	for n := range srcDirMap {
-		allEntries[n] = true
+		allEntries[n] = struct{}{}
 	}
 
 	for n := range buildFilesMap {
-		allEntries[n] = true
+		allEntries[n] = struct{}{}
 	}
 
 	err := os.MkdirAll(shared.JoinPath(topdir, forestDir), 0777)
@@ -250,15 +250,8 @@
 			continue
 		}
 
-		sDir := false
-		bDir := false
-		if sExists {
-			sDir = isDir(shared.JoinPath(topdir, srcChild), srcChildEntry)
-		}
-
-		if bExists {
-			bDir = isDir(shared.JoinPath(topdir, buildFilesChild), buildFilesChildEntry)
-		}
+		sDir := sExists && isDir(shared.JoinPath(topdir, srcChild), srcChildEntry)
+		bDir := bExists && isDir(shared.JoinPath(topdir, buildFilesChild), buildFilesChildEntry)
 
 		if !sExists {
 			if bDir && excludeChild != nil {
@@ -285,17 +278,9 @@
 			// Neither is a directory. Merge them.
 			srcBuildFile := shared.JoinPath(topdir, srcChild)
 			generatedBuildFile := shared.JoinPath(topdir, buildFilesChild)
-			// Add the src and generated build files as dependencies so that bp2build
-			// is rerun when they change. Currently, this is only really necessary
-			// for srcBuildFile, because if we regenerate the generated build files
-			// we will always rerun the symlink forest generation as well. If that
-			// is later split up into separate, fully dependency-tracing steps, then
-			// we'll need srcBuildFile as well. Adding srcBuildFile here today
-			// technically makes it a dependency of bp2build_workspace_marker, which
-			// also implicitly outputs that file, but since bp2build_workspace_marker
-			// will always have a newer timestamp than the generatedBuildFile it
-			// shouldn't be a problem.
-			*acc = append(*acc, srcBuildFile, generatedBuildFile)
+			// The Android.bp file that codegen used to produce `buildFilesChild` is
+			// already a dependency, we can ignore `buildFilesChild`.
+			*acc = append(*acc, srcChild)
 			err = mergeBuildFiles(shared.JoinPath(topdir, forestChild), srcBuildFile, generatedBuildFile, cfg.IsEnvTrue("BP2BUILD_VERBOSE"))
 			if err != nil {
 				fmt.Fprintf(os.Stderr, "Error merging %s and %s: %s",
diff --git a/build_test.bash b/build_test.bash
index 92819a1..eda4beb 100755
--- a/build_test.bash
+++ b/build_test.bash
@@ -48,8 +48,10 @@
 
 case $(uname) in
   Linux)
-    export LD_PRELOAD=/lib/x86_64-linux-gnu/libSegFault.so
-    export SEGFAULT_USE_ALTSTACK=1
+    if [[ -f /lib/x86_64-linux-gnu/libSegFault.so ]]; then
+      export LD_PRELOAD=/lib/x86_64-linux-gnu/libSegFault.so
+      export SEGFAULT_USE_ALTSTACK=1
+    fi
     ulimit -a
     ;;
 esac
@@ -62,7 +64,7 @@
 
 echo
 echo "Running Bazel smoke test..."
-STANDALONE_BAZEL=true "${TOP}/tools/bazel" --batch --max_idle_secs=1 help
+STANDALONE_BAZEL=true "${TOP}/build/bazel/bin/bazel" --batch --max_idle_secs=1 help
 
 echo
 echo "Running Soong test..."
diff --git a/cc/cc.go b/cc/cc.go
index eb7c639..a8011b8 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -2335,9 +2335,11 @@
 	ctx.ctx = ctx
 
 	deps := c.deps(ctx)
-
 	apiImportInfo := GetApiImports(c, actx)
-	deps = updateDepsWithApiImports(deps, apiImportInfo)
+
+	if ctx.Os() == android.Android && c.Target().NativeBridge != android.NativeBridgeEnabled {
+		deps = updateDepsWithApiImports(deps, apiImportInfo)
+	}
 
 	c.Properties.AndroidMkSystemSharedLibs = deps.SystemSharedLibs
 
@@ -2362,7 +2364,9 @@
 		}
 
 		// Check header lib replacement from API surface first, and then check again with VSDK
-		lib = GetReplaceModuleName(lib, apiImportInfo.HeaderLibs)
+		if ctx.Os() == android.Android && c.Target().NativeBridge != android.NativeBridgeEnabled {
+			lib = GetReplaceModuleName(lib, apiImportInfo.HeaderLibs)
+		}
 		lib = GetReplaceModuleName(lib, GetSnapshot(c, &snapshotInfo, actx).HeaderLibs)
 
 		if c.isNDKStubLibrary() {
diff --git a/cc/config/arm64_linux_host.go b/cc/config/arm64_linux_host.go
index 2d316e6..9f5124b 100644
--- a/cc/config/arm64_linux_host.go
+++ b/cc/config/arm64_linux_host.go
@@ -58,8 +58,8 @@
 )
 
 func init() {
-	pctx.StaticVariable("LinuxBionicArm64Cflags", strings.Join(linuxCrossCflags, " "))
-	pctx.StaticVariable("LinuxBionicArm64Ldflags", strings.Join(linuxCrossLdflags, " "))
+	exportedVars.ExportStringListStaticVariable("LinuxBionicArm64Cflags", linuxCrossCflags)
+	exportedVars.ExportStringListStaticVariable("LinuxBionicArm64Ldflags", linuxCrossLdflags)
 }
 
 // toolchain config for ARM64 Linux CrossHost. Almost everything is the same as the ARM64 Android
diff --git a/cc/config/x86_linux_bionic_host.go b/cc/config/x86_linux_bionic_host.go
index 96a53bf..e006471 100644
--- a/cc/config/x86_linux_bionic_host.go
+++ b/cc/config/x86_linux_bionic_host.go
@@ -15,8 +15,6 @@
 package config
 
 import (
-	"strings"
-
 	"android/soong/android"
 )
 
@@ -71,14 +69,13 @@
 )
 
 func init() {
-
-	pctx.StaticVariable("LinuxBionicCflags", strings.Join(linuxBionicCflags, " "))
-	pctx.StaticVariable("LinuxBionicLdflags", strings.Join(linuxBionicLdflags, " "))
-	pctx.StaticVariable("LinuxBionicLldflags", strings.Join(linuxBionicLdflags, " "))
+	exportedVars.ExportStringListStaticVariable("LinuxBionicCflags", linuxBionicCflags)
+	exportedVars.ExportStringListStaticVariable("LinuxBionicLdflags", linuxBionicLdflags)
+	exportedVars.ExportStringListStaticVariable("LinuxBionicLldflags", linuxBionicLdflags)
 
 	// Use the device gcc toolchain for now
-	pctx.StaticVariable("LinuxBionicGccVersion", x86_64GccVersion)
-	pctx.SourcePathVariable("LinuxBionicGccRoot",
+	exportedVars.ExportStringStaticVariable("LinuxBionicGccVersion", x86_64GccVersion)
+	exportedVars.ExportSourcePathVariable("LinuxBionicGccRoot",
 		"prebuilts/gcc/${HostPrebuiltTag}/x86/x86_64-linux-android-${LinuxBionicGccVersion}")
 }
 
diff --git a/cc/library_stub.go b/cc/library_stub.go
index 1283d76..1b02330 100644
--- a/cc/library_stub.go
+++ b/cc/library_stub.go
@@ -77,6 +77,19 @@
 	return basename + multitree.GetApiImportSuffix()
 }
 
+// Export include dirs without checking for existence.
+// The directories are not guaranteed to exist during Soong analysis.
+func (d *apiLibraryDecorator) exportIncludes(ctx ModuleContext) {
+	exporterProps := d.flagExporter.Properties
+	for _, dir := range exporterProps.Export_include_dirs {
+		d.dirs = append(d.dirs, android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), dir))
+	}
+	// system headers
+	for _, dir := range exporterProps.Export_system_include_dirs {
+		d.systemDirs = append(d.systemDirs, android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), dir))
+	}
+}
+
 func (d *apiLibraryDecorator) link(ctx ModuleContext, flags Flags, deps PathDeps, objects Objects) android.Path {
 	// Export headers as system include dirs if specified. Mostly for libc
 	if Bool(d.libraryDecorator.Properties.Llndk.Export_headers_as_system) {
@@ -87,7 +100,7 @@
 	}
 
 	// Flags reexported from dependencies. (e.g. vndk_prebuilt_shared)
-	d.libraryDecorator.flagExporter.exportIncludes(ctx)
+	d.exportIncludes(ctx)
 	d.libraryDecorator.reexportDirs(deps.ReexportedDirs...)
 	d.libraryDecorator.reexportSystemDirs(deps.ReexportedSystemDirs...)
 	d.libraryDecorator.reexportFlags(deps.ReexportedFlags...)
@@ -95,7 +108,13 @@
 	d.libraryDecorator.addExportedGeneratedHeaders(deps.ReexportedGeneratedHeaders...)
 	d.libraryDecorator.flagExporter.setProvider(ctx)
 
-	in := android.PathForModuleSrc(ctx, *d.properties.Src)
+	if d.properties.Src == nil {
+		ctx.PropertyErrorf("src", "src is a required property")
+	}
+	// Skip the existence check of the stub prebuilt file.
+	// The file is not guaranteed to exist during Soong analysis.
+	// Build orchestrator will be responsible for creating a connected ninja graph.
+	in := android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), *d.properties.Src)
 
 	d.unstrippedOutputFile = in
 	libName := d.libraryDecorator.getLibName(ctx) + flags.Toolchain.ShlibSuffix()
diff --git a/cc/library_stub_test.go b/cc/library_stub_test.go
index 288a34c..5cb4e61 100644
--- a/cc/library_stub_test.go
+++ b/cc/library_stub_test.go
@@ -241,3 +241,41 @@
 	android.AssertBoolEquals(t, "original header should be used for original library", true, hasDirectDependency(t, ctx, libfoo, libfooHeader))
 	android.AssertBoolEquals(t, "Header from API surface should not be used for original library", false, hasDirectDependency(t, ctx, libfoo, libfooHeaderApiImport))
 }
+
+func TestExportDirFromStubLibrary(t *testing.T) {
+	bp := `
+		cc_library {
+			name: "libfoo",
+			export_include_dirs: ["source_include_dir"],
+			export_system_include_dirs: ["source_system_include_dir"],
+			vendor_available: true,
+		}
+		cc_api_library {
+			name: "libfoo",
+			export_include_dirs: ["stub_include_dir"],
+			export_system_include_dirs: ["stub_system_include_dir"],
+			vendor_available: true,
+			src: "libfoo.so",
+		}
+		api_imports {
+			name: "api_imports",
+			shared_libs: [
+				"libfoo",
+			],
+			header_libs: [],
+		}
+		// vendor binary
+		cc_binary {
+			name: "vendorbin",
+			vendor: true,
+			srcs: ["vendor.cc"],
+			shared_libs: ["libfoo"],
+		}
+	`
+	ctx := prepareForCcTest.RunTestWithBp(t, bp)
+	vendorCFlags := ctx.ModuleForTests("vendorbin", "android_vendor.29_arm64_armv8-a").Rule("cc").Args["cFlags"]
+	android.AssertStringDoesContain(t, "Vendor binary should compile using headers provided by stub", vendorCFlags, "-Istub_include_dir")
+	android.AssertStringDoesNotContain(t, "Vendor binary should not compile using headers of source", vendorCFlags, "-Isource_include_dir")
+	android.AssertStringDoesContain(t, "Vendor binary should compile using system headers provided by stub", vendorCFlags, "-isystem stub_system_include_dir")
+	android.AssertStringDoesNotContain(t, "Vendor binary should not compile using system headers of source", vendorCFlags, "-isystem source_system_include_dir")
+}
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index 70f58f5..87710c0 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -15,6 +15,7 @@
 package main
 
 import (
+	"bytes"
 	"flag"
 	"fmt"
 	"io/ioutil"
@@ -478,12 +479,19 @@
 		os.Exit(1)
 	}
 
-	err = ioutil.WriteFile(path, data, 0666)
-	if err != nil {
+	if preexistingData, err := os.ReadFile(path); err != nil {
+		if !os.IsNotExist(err) {
+			fmt.Fprintf(os.Stderr, "error reading used environment file '%s': %s\n", usedEnvFile, err)
+			os.Exit(1)
+		}
+	} else if bytes.Equal(preexistingData, data) {
+		// used environment file is unchanged
+		return
+	}
+	if err = os.WriteFile(path, data, 0666); err != nil {
 		fmt.Fprintf(os.Stderr, "error writing used environment file '%s': %s\n", usedEnvFile, err)
 		os.Exit(1)
 	}
-
 	// Touch the output file so that it's not older than the file we just
 	// wrote. We can't write the environment file earlier because one an access
 	// new environment variables while writing it.
@@ -511,6 +519,12 @@
 	}
 }
 
+func touchIfDoesNotExist(path string) {
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		touch(path)
+	}
+}
+
 // Find BUILD files in the srcDir which are not in the allowlist
 // (android.Bp2BuildConversionAllowlist#ShouldKeepExistingBuildFileForDir)
 // and return their paths so they can be left out of the Bazel workspace dir (i.e. ignored)
@@ -608,21 +622,11 @@
 		bp2buildCtx.SetAllowMissingDependencies(configuration.AllowMissingDependencies())
 		bp2buildCtx.SetNameInterface(newNameResolver(configuration))
 		bp2buildCtx.RegisterForBazelConversion()
+		bp2buildCtx.SetModuleListFile(cmdlineArgs.ModuleListFile)
 
 		var ninjaDeps []string
 		ninjaDeps = append(ninjaDeps, extraNinjaDeps...)
 
-		// The bp2build process is a purely functional process that only depends on
-		// Android.bp files. It must not depend on the values of per-build product
-		// configurations or variables, since those will generate different BUILD
-		// files based on how the user has configured their tree.
-		bp2buildCtx.SetModuleListFile(cmdlineArgs.ModuleListFile)
-		if modulePaths, err := bp2buildCtx.ListModulePaths("."); err != nil {
-			panic(err)
-		} else {
-			ninjaDeps = append(ninjaDeps, modulePaths...)
-		}
-
 		// Run the loading and analysis pipeline to prepare the graph of regular
 		// Modules parsed from Android.bp files, and the BazelTargetModules mapped
 		// from the regular Modules.
@@ -676,8 +680,9 @@
 
 		writeDepFile(bp2buildMarker, eventHandler, ninjaDeps)
 
-		// Create an empty bp2build marker file.
-		touch(shared.JoinPath(topDir, bp2buildMarker))
+		// Create an empty bp2build marker file, if it does not already exist.
+		// Note the relevant rule has `restat = true`
+		touchIfDoesNotExist(shared.JoinPath(topDir, bp2buildMarker))
 	})
 
 	// Only report metrics when in bp2build mode. The metrics aren't relevant
diff --git a/cmd/soong_ui/main.go b/cmd/soong_ui/main.go
index b06e4fe..19166d2 100644
--- a/cmd/soong_ui/main.go
+++ b/cmd/soong_ui/main.go
@@ -132,8 +132,13 @@
 		build.OsEnvironment().IsEnvTrue("ANDROID_QUIET_BUILD"),
 		build.OsEnvironment().IsEnvTrue("SOONG_UI_ANSI_OUTPUT"))
 
+	// Create and start a new metric record.
+	met := metrics.New()
+	met.SetBuildDateTime(buildStarted)
+	met.SetBuildCommand(os.Args)
+
 	// Attach a new logger instance to the terminal output.
-	log := logger.New(output)
+	log := logger.NewWithMetrics(output, met)
 	defer log.Cleanup()
 
 	// Create a context to simplify the program termination process.
@@ -144,11 +149,6 @@
 	trace := tracer.New(log)
 	defer trace.Close()
 
-	// Create and start a new metric record.
-	met := metrics.New()
-	met.SetBuildDateTime(buildStarted)
-	met.SetBuildCommand(os.Args)
-
 	// Create a new Status instance, which manages action counts and event output channels.
 	stat := &status.Status{}
 	defer stat.Finish()
@@ -281,7 +281,7 @@
 
 	if flags.NArg() != 1 {
 		flags.Usage()
-		os.Exit(1)
+		ctx.Fatalf("Invalid usage")
 	}
 
 	varName := flags.Arg(0)
@@ -341,7 +341,7 @@
 
 	if flags.NArg() != 0 {
 		flags.Usage()
-		os.Exit(1)
+		ctx.Fatalf("Invalid usage")
 	}
 
 	vars := strings.Fields(*varsStr)
@@ -502,7 +502,7 @@
 		fmt.Fprintln(writer, "!")
 		fmt.Fprintln(writer, "! Older versions are saved in verbose.log.#.gz files")
 		fmt.Fprintln(writer, "")
-		ctx.Fatal("done")
+		ctx.Fatal("Invalid argument")
 	}
 
 	if _, ok := config.Environment().Get("ONE_SHOT_MAKEFILE"); ok {
@@ -513,7 +513,7 @@
 		fmt.Fprintln(writer, "!")
 		fmt.Fprintln(writer, "! Otherwise, either specify a module name with m, or use mma / MODULES-IN-...")
 		fmt.Fprintln(writer, "")
-		ctx.Fatal("done")
+		ctx.Fatal("Invalid environment")
 	}
 
 	build.Build(ctx, config)
diff --git a/java/java_test.go b/java/java_test.go
index d2373e3..3b86f9a 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -1288,6 +1288,8 @@
 }
 
 func TestAidlIncludeDirFromConvertedFileGroupWithPathPropInMixedBuilds(t *testing.T) {
+	// TODO(b/247782695), TODO(b/242847534) Fix mixed builds for filegroups
+	t.Skip("Re-enable once filegroups are corrected for mixed builds")
 	bp := `
 	filegroup {
 		name: "foo_aidl",
diff --git a/java/lint.go b/java/lint.go
index fcd6d31..9827159 100644
--- a/java/lint.go
+++ b/java/lint.go
@@ -333,7 +333,7 @@
 		l.extraMainlineLintErrors = append(l.extraMainlineLintErrors, updatabilityChecks...)
 		// Skip lint warning checks for NewApi warnings for libcore where they come from source
 		// files that reference the API they are adding (b/208656169).
-		if ctx.ModuleDir() != "libcore" {
+		if !strings.HasPrefix(ctx.ModuleDir(), "libcore") {
 			_, filtered := android.FilterList(l.properties.Lint.Warning_checks, updatabilityChecks)
 
 			if len(filtered) != 0 {
diff --git a/tests/apex_comparison_tests.sh b/tests/apex_comparison_tests.sh
index 61d131b..5fbbd0f 100755
--- a/tests/apex_comparison_tests.sh
+++ b/tests/apex_comparison_tests.sh
@@ -34,7 +34,7 @@
 BAZEL_OUTPUT_DIR="$OUTPUT_DIR/bazel"
 
 function call_bazel() {
-  tools/bazel --output_base="$BAZEL_OUTPUT_DIR" $@
+  build/bazel/bin/bazel --output_base="$BAZEL_OUTPUT_DIR" $@
 }
 
 function cleanup {
diff --git a/tests/lib.sh b/tests/lib.sh
index 4b4d908..7dd2bf3 100644
--- a/tests/lib.sh
+++ b/tests/lib.sh
@@ -128,7 +128,6 @@
 
   symlink_file WORKSPACE
   symlink_file BUILD
-  symlink_file tools/bazel
 }
 
 function run_bazel {
@@ -136,7 +135,7 @@
   # output should not be parsed as such.
   rm -rf out/ninja_build
 
-  tools/bazel "$@"
+  build/bazel/bin/bazel "$@"
 }
 
 function run_ninja {
diff --git a/ui/build/bazel.go b/ui/build/bazel.go
index 0ebfcd8..bd469a4 100644
--- a/ui/build/bazel.go
+++ b/ui/build/bazel.go
@@ -85,9 +85,9 @@
 
 	bazelEnv["SHELL"] = "/bin/bash"
 
-	// `tools/bazel` is the default entry point for executing Bazel in the AOSP
+	// `build/bazel/bin/bazel` is the default entry point for executing Bazel in the AOSP
 	// source tree.
-	bazelExecutable := filepath.Join("tools", "bazel")
+	bazelExecutable := filepath.Join("build", "bazel", "bin", "bazel")
 	cmd := Command(ctx, config, "bazel", bazelExecutable)
 
 	// Append custom startup flags to the Bazel command. Startup flags affect
diff --git a/ui/build/config.go b/ui/build/config.go
index cde8d5d..889311d 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -464,10 +464,11 @@
 
 func buildConfig(config Config) *smpb.BuildConfig {
 	c := &smpb.BuildConfig{
-		ForceUseGoma:    proto.Bool(config.ForceUseGoma()),
-		UseGoma:         proto.Bool(config.UseGoma()),
-		UseRbe:          proto.Bool(config.UseRBE()),
-		BazelMixedBuild: proto.Bool(config.BazelBuildEnabled()),
+		ForceUseGoma:                proto.Bool(config.ForceUseGoma()),
+		UseGoma:                     proto.Bool(config.UseGoma()),
+		UseRbe:                      proto.Bool(config.UseRBE()),
+		BazelMixedBuild:             proto.Bool(config.BazelBuildEnabled()),
+		ForceDisableBazelMixedBuild: proto.Bool(config.IsBazelMixedBuildForceDisabled()),
 	}
 	c.Targets = append(c.Targets, config.arguments...)
 
@@ -1452,6 +1453,10 @@
 	return c.emptyNinjaFile
 }
 
+func (c *configImpl) IsBazelMixedBuildForceDisabled() bool {
+	return c.Environment().IsEnvTrue("BUILD_BROKEN_DISABLE_BAZEL")
+}
+
 func GetMetricsUploader(topDir string, env *Environment) string {
 	if p, ok := env.Get("METRICS_UPLOADER"); ok {
 		metricsUploader := filepath.Join(topDir, p)
diff --git a/ui/build/config_test.go b/ui/build/config_test.go
index 9ea5110..968544b 100644
--- a/ui/build/config_test.go
+++ b/ui/build/config_test.go
@@ -28,6 +28,7 @@
 	"android/soong/ui/logger"
 	smpb "android/soong/ui/metrics/metrics_proto"
 	"android/soong/ui/status"
+
 	"google.golang.org/protobuf/encoding/prototext"
 
 	"google.golang.org/protobuf/proto"
@@ -1015,40 +1016,55 @@
 			name:    "none set",
 			environ: Environment{},
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(false),
-				UseGoma:         proto.Bool(false),
-				UseRbe:          proto.Bool(false),
-				BazelMixedBuild: proto.Bool(false),
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(false),
+				ForceDisableBazelMixedBuild: proto.Bool(false),
 			},
 		},
 		{
 			name:    "force use goma",
 			environ: Environment{"FORCE_USE_GOMA=1"},
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(true),
-				UseGoma:         proto.Bool(false),
-				UseRbe:          proto.Bool(false),
-				BazelMixedBuild: proto.Bool(false),
+				ForceUseGoma:                proto.Bool(true),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(false),
+				ForceDisableBazelMixedBuild: proto.Bool(false),
 			},
 		},
 		{
 			name:    "use goma",
 			environ: Environment{"USE_GOMA=1"},
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(false),
-				UseGoma:         proto.Bool(true),
-				UseRbe:          proto.Bool(false),
-				BazelMixedBuild: proto.Bool(false),
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(true),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(false),
+				ForceDisableBazelMixedBuild: proto.Bool(false),
 			},
 		},
 		{
 			name:    "use rbe",
 			environ: Environment{"USE_RBE=1"},
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(false),
-				UseGoma:         proto.Bool(false),
-				UseRbe:          proto.Bool(true),
-				BazelMixedBuild: proto.Bool(false),
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(true),
+				BazelMixedBuild:             proto.Bool(false),
+				ForceDisableBazelMixedBuild: proto.Bool(false),
+			},
+		},
+		{
+			name:    "disable mixed builds",
+			environ: Environment{"BUILD_BROKEN_DISABLE_BAZEL=1"},
+			expectedBuildConfig: &smpb.BuildConfig{
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(false),
+				ForceDisableBazelMixedBuild: proto.Bool(true),
 			},
 		},
 		{
@@ -1056,10 +1072,11 @@
 			environ:  Environment{},
 			useBazel: true,
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(false),
-				UseGoma:         proto.Bool(false),
-				UseRbe:          proto.Bool(false),
-				BazelMixedBuild: proto.Bool(false),
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(false),
+				ForceDisableBazelMixedBuild: proto.Bool(false),
 			},
 		},
 		{
@@ -1067,10 +1084,11 @@
 			environ:      Environment{},
 			bazelDevMode: true,
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(false),
-				UseGoma:         proto.Bool(false),
-				UseRbe:          proto.Bool(false),
-				BazelMixedBuild: proto.Bool(true),
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(true),
+				ForceDisableBazelMixedBuild: proto.Bool(false),
 			},
 		},
 		{
@@ -1078,10 +1096,11 @@
 			environ:       Environment{},
 			bazelProdMode: true,
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(false),
-				UseGoma:         proto.Bool(false),
-				UseRbe:          proto.Bool(false),
-				BazelMixedBuild: proto.Bool(true),
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(true),
+				ForceDisableBazelMixedBuild: proto.Bool(false),
 			},
 		},
 		{
@@ -1089,10 +1108,11 @@
 			environ:          Environment{},
 			bazelStagingMode: true,
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(false),
-				UseGoma:         proto.Bool(false),
-				UseRbe:          proto.Bool(false),
-				BazelMixedBuild: proto.Bool(true),
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(true),
+				ForceDisableBazelMixedBuild: proto.Bool(false),
 			},
 		},
 		{
@@ -1101,11 +1121,12 @@
 			useBazel:  true,
 			arguments: []string{"droid", "dist"},
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(false),
-				UseGoma:         proto.Bool(false),
-				UseRbe:          proto.Bool(false),
-				BazelMixedBuild: proto.Bool(false),
-				Targets:         []string{"droid", "dist"},
+				ForceUseGoma:                proto.Bool(false),
+				UseGoma:                     proto.Bool(false),
+				UseRbe:                      proto.Bool(false),
+				BazelMixedBuild:             proto.Bool(false),
+				Targets:                     []string{"droid", "dist"},
+				ForceDisableBazelMixedBuild: proto.Bool(false),
 			},
 		},
 		{
@@ -1114,14 +1135,16 @@
 				"FORCE_USE_GOMA=1",
 				"USE_GOMA=1",
 				"USE_RBE=1",
+				"BUILD_BROKEN_DISABLE_BAZEL=1",
 			},
 			useBazel:     true,
 			bazelDevMode: true,
 			expectedBuildConfig: &smpb.BuildConfig{
-				ForceUseGoma:    proto.Bool(true),
-				UseGoma:         proto.Bool(true),
-				UseRbe:          proto.Bool(true),
-				BazelMixedBuild: proto.Bool(true),
+				ForceUseGoma:                proto.Bool(true),
+				UseGoma:                     proto.Bool(true),
+				UseRbe:                      proto.Bool(true),
+				BazelMixedBuild:             proto.Bool(true),
+				ForceDisableBazelMixedBuild: proto.Bool(true),
 			},
 		},
 	}
diff --git a/ui/build/context.go b/ui/build/context.go
index 4a4352c..2fef0d0 100644
--- a/ui/build/context.go
+++ b/ui/build/context.go
@@ -48,7 +48,7 @@
 		c.Tracer.Begin(desc, c.Thread)
 	}
 	if c.Metrics != nil {
-		c.Metrics.EventTracer.Begin(name, desc, c.Thread)
+		c.Metrics.EventTracer.Begin(name, desc)
 	}
 }
 
@@ -58,7 +58,7 @@
 		c.Tracer.End(c.Thread)
 	}
 	if c.Metrics != nil {
-		c.Metrics.SetTimeMetrics(c.Metrics.EventTracer.End(c.Thread))
+		c.Metrics.SetTimeMetrics(c.Metrics.EventTracer.End())
 	}
 }
 
diff --git a/ui/build/soong.go b/ui/build/soong.go
index 00e0497..88e5592 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -399,7 +399,7 @@
 	soongBuildEnv := config.Environment().Copy()
 	soongBuildEnv.Set("TOP", os.Getenv("TOP"))
 	// For Bazel mixed builds.
-	soongBuildEnv.Set("BAZEL_PATH", "./tools/bazel")
+	soongBuildEnv.Set("BAZEL_PATH", "./build/bazel/bin/bazel")
 	// Bazel's HOME var is set to an output subdirectory which doesn't exist. This
 	// prevents Bazel from file I/O in the actual user HOME directory.
 	soongBuildEnv.Set("BAZEL_HOME", absPath(ctx, filepath.Join(config.BazelOutDir(), "bazelhome")))
diff --git a/ui/logger/Android.bp b/ui/logger/Android.bp
index 269a5a0..7883ea6 100644
--- a/ui/logger/Android.bp
+++ b/ui/logger/Android.bp
@@ -25,4 +25,7 @@
     testSrcs: [
         "logger_test.go",
     ],
+    deps: [
+        "soong-ui-metrics",
+    ],
 }
diff --git a/ui/logger/logger.go b/ui/logger/logger.go
index 9b26ae8..1185298 100644
--- a/ui/logger/logger.go
+++ b/ui/logger/logger.go
@@ -29,6 +29,7 @@
 package logger
 
 import (
+	"android/soong/ui/metrics"
 	"errors"
 	"fmt"
 	"io"
@@ -72,8 +73,8 @@
 	Output(calldepth int, str string) error
 }
 
-// fatalLog is the type used when Fatal[f|ln]
-type fatalLog struct {
+// fatalError is the type used when Fatal[f|ln]
+type fatalError struct {
 	error
 }
 
@@ -127,7 +128,7 @@
 
 	if p == nil {
 		return
-	} else if log, ok := p.(fatalLog); ok {
+	} else if log, ok := p.(fatalError); ok {
 		fn(error(log))
 	} else {
 		panic(p)
@@ -141,6 +142,7 @@
 	fileLogger *log.Logger
 	mutex      sync.Mutex
 	file       *os.File
+	metrics    *metrics.Metrics
 }
 
 var _ Logger = &stdLogger{}
@@ -149,9 +151,14 @@
 // os.Stderr, but it may be a buffer for tests, or a separate log file if
 // the user doesn't need to see the output.
 func New(out io.Writer) *stdLogger {
+	return NewWithMetrics(out, nil)
+}
+
+func NewWithMetrics(out io.Writer, m *metrics.Metrics) *stdLogger {
 	return &stdLogger{
 		stderr:     log.New(out, "", log.Ltime),
 		fileLogger: log.New(ioutil.Discard, "", log.Ldate|log.Lmicroseconds|log.Llongfile),
+		metrics:    m,
 	}
 }
 
@@ -201,7 +208,7 @@
 	fatal := false
 	p := recover()
 
-	if _, ok := p.(fatalLog); ok {
+	if _, ok := p.(fatalError); ok {
 		fatal = true
 		p = nil
 	} else if p != nil {
@@ -217,40 +224,56 @@
 	}
 }
 
+type verbosityLevel int
+
+const (
+	verboseLog verbosityLevel = iota
+	infoLog
+	fatalLog
+	panicLog
+)
+
 // Output writes string to both stderr and the file log.
 func (s *stdLogger) Output(calldepth int, str string) error {
-	s.stderr.Output(calldepth+1, str)
+	return s.output(calldepth, str, infoLog)
+}
+
+// output writes string to stderr, the file log, and if fatal or panic, to metrics.
+func (s *stdLogger) output(calldepth int, str string, level verbosityLevel) error {
+	if level != verboseLog || s.verbose {
+		s.stderr.Output(calldepth+1, str)
+	}
+	if level >= fatalLog {
+		s.metrics.SetFatalOrPanicMessage(str)
+	}
 	return s.fileLogger.Output(calldepth+1, str)
 }
 
 // VerboseOutput is equivalent to Output, but only goes to the file log
 // unless SetVerbose(true) has been called.
 func (s *stdLogger) VerboseOutput(calldepth int, str string) error {
-	if s.verbose {
-		s.stderr.Output(calldepth+1, str)
-	}
-	return s.fileLogger.Output(calldepth+1, str)
+	return s.output(calldepth, str, verboseLog)
 }
 
 // Print prints to both stderr and the file log.
 // Arguments are handled in the manner of fmt.Print.
 func (s *stdLogger) Print(v ...interface{}) {
 	output := fmt.Sprint(v...)
-	s.Output(2, output)
+	s.output(2, output, infoLog)
 }
 
 // Printf prints to both stderr and the file log.
 // Arguments are handled in the manner of fmt.Printf.
 func (s *stdLogger) Printf(format string, v ...interface{}) {
 	output := fmt.Sprintf(format, v...)
-	s.Output(2, output)
+	s.output(2, output, infoLog)
 }
 
 // Println prints to both stderr and the file log.
 // Arguments are handled in the manner of fmt.Println.
 func (s *stdLogger) Println(v ...interface{}) {
 	output := fmt.Sprintln(v...)
-	s.Output(2, output)
+	s.output(2, output, infoLog)
 }
 
 // Verbose is equivalent to Print, but only goes to the file log unless
@@ -278,43 +301,43 @@
 // Cleanup will convert to a os.Exit(1).
 func (s *stdLogger) Fatal(v ...interface{}) {
 	output := fmt.Sprint(v...)
-	s.Output(2, output)
-	panic(fatalLog{errors.New(output)})
+	s.output(2, output, fatalLog)
+	panic(fatalError{errors.New(output)})
 }
 
 // Fatalf is equivalent to Printf() followed by a call to panic() that
 // Cleanup will convert to a os.Exit(1).
 func (s *stdLogger) Fatalf(format string, v ...interface{}) {
 	output := fmt.Sprintf(format, v...)
-	s.Output(2, output)
-	panic(fatalLog{errors.New(output)})
+	s.output(2, output, fatalLog)
+	panic(fatalError{errors.New(output)})
 }
 
 // Fatalln is equivalent to Println() followed by a call to panic() that
 // Cleanup will convert to a os.Exit(1).
 func (s *stdLogger) Fatalln(v ...interface{}) {
 	output := fmt.Sprintln(v...)
-	s.Output(2, output)
-	panic(fatalLog{errors.New(output)})
+	s.output(2, output, fatalLog)
+	panic(fatalError{errors.New(output)})
 }
 
 // Panic is equivalent to Print() followed by a call to panic().
 func (s *stdLogger) Panic(v ...interface{}) {
 	output := fmt.Sprint(v...)
-	s.Output(2, output)
+	s.output(2, output, panicLog)
 	panic(output)
 }
 
 // Panicf is equivalent to Printf() followed by a call to panic().
 func (s *stdLogger) Panicf(format string, v ...interface{}) {
 	output := fmt.Sprintf(format, v...)
-	s.Output(2, output)
+	s.output(2, output, panicLog)
 	panic(output)
 }
 
 // Panicln is equivalent to Println() followed by a call to panic().
 func (s *stdLogger) Panicln(v ...interface{}) {
 	output := fmt.Sprintln(v...)
-	s.Output(2, output)
+	s.output(2, output, panicLog)
 	panic(output)
 }
diff --git a/ui/metrics/Android.bp b/ui/metrics/Android.bp
index 05db1d7..2301c56 100644
--- a/ui/metrics/Android.bp
+++ b/ui/metrics/Android.bp
@@ -25,7 +25,6 @@
         "soong-ui-metrics_upload_proto",
         "soong-ui-metrics_proto",
         "soong-ui-mk_metrics_proto",
-        "soong-ui-tracer",
         "soong-shared",
     ],
     srcs: [
diff --git a/ui/metrics/event.go b/ui/metrics/event.go
index ebe664f..b3a027e 100644
--- a/ui/metrics/event.go
+++ b/ui/metrics/event.go
@@ -31,7 +31,6 @@
 	"time"
 
 	soong_metrics_proto "android/soong/ui/metrics/metrics_proto"
-	"android/soong/ui/tracer"
 
 	"google.golang.org/protobuf/proto"
 )
@@ -50,6 +49,10 @@
 	// for metrics analysis).
 	desc string
 
+	nonZeroExitCode bool
+
+	errorMsg *string
+
 	// The time that the event started to occur.
 	start time.Time
 
@@ -68,13 +71,18 @@
 
 func (e event) perfInfo() soong_metrics_proto.PerfInfo {
 	realTime := uint64(_now().Sub(e.start).Nanoseconds())
-	return soong_metrics_proto.PerfInfo{
+	perfInfo := soong_metrics_proto.PerfInfo{
 		Description:           proto.String(e.desc),
 		Name:                  proto.String(e.name),
 		StartTime:             proto.Uint64(uint64(e.start.UnixNano())),
 		RealTime:              proto.Uint64(realTime),
 		ProcessesResourceInfo: e.procResInfo,
+		NonZeroExit:           proto.Bool(e.nonZeroExitCode),
 	}
+	if m := e.errorMsg; m != nil {
+		perfInfo.ErrorMessage = proto.String(*m)
+	}
+	return perfInfo
 }
 
 // EventTracer is an array of events that provides functionality to trace a
@@ -94,6 +102,9 @@
 
 // peek returns the active build event.
 func (t *EventTracer) peek() *event {
+	if t.empty() {
+		return nil
+	}
 	return (*t)[t.lastIndex()]
 }
 
@@ -137,12 +148,12 @@
 }
 
 // Begin starts tracing the event.
-func (t *EventTracer) Begin(name, desc string, _ tracer.Thread) {
+func (t *EventTracer) Begin(name, desc string) {
 	t.push(newEvent(name, desc))
 }
 
 // End performs post calculations such as duration of the event, aggregates
 // the collected performance information into PerfInfo protobuf message.
-func (t *EventTracer) End(tracer.Thread) soong_metrics_proto.PerfInfo {
+func (t *EventTracer) End() soong_metrics_proto.PerfInfo {
 	return t.pop().perfInfo()
 }
diff --git a/ui/metrics/event_test.go b/ui/metrics/event_test.go
index 043450b..a80e7cf 100644
--- a/ui/metrics/event_test.go
+++ b/ui/metrics/event_test.go
@@ -17,8 +17,6 @@
 import (
 	"testing"
 	"time"
-
-	"android/soong/ui/tracer"
 )
 
 func TestEnd(t *testing.T) {
@@ -35,8 +33,31 @@
 		start: startTime,
 	})
 
-	perf := et.End(tracer.Thread(0))
+	perf := et.End()
 	if perf.GetRealTime() != uint64(dur.Nanoseconds()) {
 		t.Errorf("got %d, want %d nanoseconds for event duration", perf.GetRealTime(), dur.Nanoseconds())
 	}
 }
+
+func TestEndWithError(t *testing.T) {
+	startTime := time.Date(2020, time.July, 13, 13, 0, 0, 0, time.UTC)
+	dur := time.Nanosecond * 10
+	initialNow := _now
+	_now = func() time.Time { return startTime.Add(dur) }
+	defer func() { _now = initialNow }()
+
+	err := "foobar"
+	et := &EventTracer{}
+	et.push(&event{
+		desc:            "test",
+		name:            "test",
+		start:           startTime,
+		nonZeroExitCode: true,
+		errorMsg:        &err,
+	})
+
+	perf := et.End()
+	if msg := perf.GetErrorMessage(); msg != err {
+		t.Errorf("got %q, want %q for even error message", msg, err)
+	}
+}
diff --git a/ui/metrics/metrics.go b/ui/metrics/metrics.go
index 0c62865..ce2d946 100644
--- a/ui/metrics/metrics.go
+++ b/ui/metrics/metrics.go
@@ -125,6 +125,21 @@
 	}
 }
 
+// SetFatalOrPanicMessage stores a non-zero exit and the relevant message in the latest event if
+// available or the metrics base.
+func (m *Metrics) SetFatalOrPanicMessage(errMsg string) {
+	if m == nil {
+		return
+	}
+	if event := m.EventTracer.peek(); event != nil {
+		event.nonZeroExitCode = true
+		event.errorMsg = &errMsg
+	} else {
+		m.metrics.ErrorMessage = proto.String(errMsg)
+	}
+	m.metrics.NonZeroExit = proto.Bool(true)
+}
+
 // BuildConfig stores information about the build configuration.
 func (m *Metrics) BuildConfig(b *soong_metrics_proto.BuildConfig) {
 	m.metrics.BuildConfig = b
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index be9b9dc..90d124b 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -338,6 +338,12 @@
 	BazelRuns []*PerfInfo `protobuf:"bytes,27,rep,name=bazel_runs,json=bazelRuns" json:"bazel_runs,omitempty"`
 	// The metrics of the experiment config fetcher
 	ExpConfigFetcher *ExpConfigFetcher `protobuf:"bytes,28,opt,name=exp_config_fetcher,json=expConfigFetcher" json:"exp_config_fetcher,omitempty"`
+	// Whether the build exited with a panic or non-zero exit code, includes both
+	// non-zero exits of recorded phases and non-recorded phases of the build.
+	NonZeroExit *bool `protobuf:"varint,29,opt,name=non_zero_exit,json=nonZeroExit" json:"non_zero_exit,omitempty"`
+	// The error message due to a non-zero exit _only_ if it did not occur in a
+	// recorded phase of the build.
+	ErrorMessage *string `protobuf:"bytes,30,opt,name=error_message,json=errorMessage" json:"error_message,omitempty"`
 }
 
 // Default values for MetricsBase fields.
@@ -576,6 +582,20 @@
 	return nil
 }
 
+func (x *MetricsBase) GetNonZeroExit() bool {
+	if x != nil && x.NonZeroExit != nil {
+		return *x.NonZeroExit
+	}
+	return false
+}
+
+func (x *MetricsBase) GetErrorMessage() string {
+	if x != nil && x.ErrorMessage != nil {
+		return *x.ErrorMessage
+	}
+	return ""
+}
+
 type BuildConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -755,6 +775,11 @@
 	MemoryUse *uint64 `protobuf:"varint,5,opt,name=memory_use,json=memoryUse" json:"memory_use,omitempty"`
 	// The resource information of each executed process.
 	ProcessesResourceInfo []*ProcessResourceInfo `protobuf:"bytes,6,rep,name=processes_resource_info,json=processesResourceInfo" json:"processes_resource_info,omitempty"`
+	// Whether the phase of tool running exited with a panic or non-zero exit
+	// code.
+	NonZeroExit *bool `protobuf:"varint,7,opt,name=non_zero_exit,json=nonZeroExit" json:"non_zero_exit,omitempty"`
+	// The error message, if any, due to a non-zero exit.
+	ErrorMessage *string `protobuf:"bytes,8,opt,name=error_message,json=errorMessage" json:"error_message,omitempty"`
 }
 
 func (x *PerfInfo) Reset() {
@@ -832,6 +857,20 @@
 	return nil
 }
 
+func (x *PerfInfo) GetNonZeroExit() bool {
+	if x != nil && x.NonZeroExit != nil {
+		return *x.NonZeroExit
+	}
+	return false
+}
+
+func (x *PerfInfo) GetErrorMessage() string {
+	if x != nil && x.ErrorMessage != nil {
+		return *x.ErrorMessage
+	}
+	return ""
+}
+
 type ProcessResourceInfo struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1370,7 +1409,7 @@
 var file_metrics_proto_rawDesc = []byte{
 	0x0a, 0x0d, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
 	0x13, 0x73, 0x6f, 0x6f, 0x6e, 0x67, 0x5f, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x6d, 0x65, 0x74,
-	0x72, 0x69, 0x63, 0x73, 0x22, 0xad, 0x0d, 0x0a, 0x0b, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73,
+	0x72, 0x69, 0x63, 0x73, 0x22, 0xf6, 0x0d, 0x0a, 0x0b, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73,
 	0x42, 0x61, 0x73, 0x65, 0x12, 0x30, 0x0a, 0x14, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f, 0x64, 0x61,
 	0x74, 0x65, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x18, 0x01, 0x20, 0x01,
 	0x28, 0x03, 0x52, 0x12, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x44, 0x61, 0x74, 0x65, 0x54, 0x69, 0x6d,
@@ -1470,157 +1509,166 @@
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 }
 
 var (
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index 3e644a1..07a7df1 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -111,6 +111,14 @@
 
   // The metrics of the experiment config fetcher
   optional ExpConfigFetcher exp_config_fetcher = 28;
+
+  // Whether the build exited with a panic or non-zero exit code, includes both
+  // non-zero exits of recorded phases and non-recorded phases of the build.
+  optional bool non_zero_exit = 29;
+
+  // The error message due to a non-zero exit _only_ if it did not occur in a
+  // recorded phase of the build.
+  optional string error_message = 30;
 }
 
 message BuildConfig {
@@ -163,6 +171,13 @@
 
   // The resource information of each executed process.
   repeated ProcessResourceInfo processes_resource_info = 6;
+
+  // Whether the phase of tool running exited with a panic or non-zero exit
+  // code.
+  optional bool non_zero_exit = 7;
+
+  // The error message, if any, due to a non-zero exit.
+  optional string error_message = 8;
 }
 
 message ProcessResourceInfo {