Switch to libunwind to remove dependency on libgcc for musl am: 441898c285

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1983628

Change-Id: I1520b92b0fa7a3266915cd20dd45019df761a849
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
index 9cf7bbd..ccf9e9d 100644
--- a/filesystem/filesystem.go
+++ b/filesystem/filesystem.go
@@ -43,8 +43,14 @@
 	// Function that builds extra files under the root directory and returns the files
 	buildExtraFiles func(ctx android.ModuleContext, root android.OutputPath) android.OutputPaths
 
+	// Function that filters PackagingSpecs returned by PackagingBase.GatherPackagingSpecs()
+	filterPackagingSpecs func(specs map[string]android.PackagingSpec)
+
 	output     android.OutputPath
 	installDir android.InstallPath
+
+	// For testing. Keeps the result of CopyDepsToZip()
+	entries []string
 }
 
 type symlinkDefinition struct {
@@ -226,7 +232,7 @@
 
 func (f *filesystem) buildImageUsingBuildImage(ctx android.ModuleContext) android.OutputPath {
 	depsZipFile := android.PathForModuleOut(ctx, "deps.zip").OutputPath
-	f.CopyDepsToZip(ctx, f.GatherPackagingSpecs(ctx), depsZipFile)
+	f.entries = f.CopyDepsToZip(ctx, f.gatherFilteredPackagingSpecs(ctx), depsZipFile)
 
 	builder := android.NewRuleBuilder(pctx, ctx)
 	depsBase := proptools.StringDefault(f.properties.Base_dir, ".")
@@ -345,7 +351,7 @@
 	}
 
 	depsZipFile := android.PathForModuleOut(ctx, "deps.zip").OutputPath
-	f.CopyDepsToZip(ctx, f.GatherPackagingSpecs(ctx), depsZipFile)
+	f.entries = f.CopyDepsToZip(ctx, f.gatherFilteredPackagingSpecs(ctx), depsZipFile)
 
 	builder := android.NewRuleBuilder(pctx, ctx)
 	depsBase := proptools.StringDefault(f.properties.Base_dir, ".")
@@ -434,3 +440,14 @@
 	}
 	return nil
 }
+
+// Filter the result of GatherPackagingSpecs to discard items targeting outside "system" partition.
+// Note that "apex" module installs its contents to "apex"(fake partition) as well
+// for symbol lookup by imitating "activated" paths.
+func (f *filesystem) gatherFilteredPackagingSpecs(ctx android.ModuleContext) map[string]android.PackagingSpec {
+	specs := f.PackagingBase.GatherPackagingSpecs(ctx)
+	if f.filterPackagingSpecs != nil {
+		f.filterPackagingSpecs(specs)
+	}
+	return specs
+}
diff --git a/filesystem/filesystem_test.go b/filesystem/filesystem_test.go
index e78fdff..cda06d9 100644
--- a/filesystem/filesystem_test.go
+++ b/filesystem/filesystem_test.go
@@ -45,11 +45,11 @@
 
 func TestFileSystemFillsLinkerConfigWithStubLibs(t *testing.T) {
 	result := fixture.RunTestWithBp(t, `
-	        android_system_image {
+		android_system_image {
 			name: "myfilesystem",
 			deps: [
 				"libfoo",
-                                "libbar",
+				"libbar",
 			],
 			linker_config_src: "linker.config.json",
 		}
@@ -74,3 +74,54 @@
 	android.AssertStringDoesNotContain(t, "linker.config.pb should not have libbar",
 		output.RuleParams.Command, "libbar.so")
 }
+
+func registerComponent(ctx android.RegistrationContext) {
+	ctx.RegisterModuleType("component", componentFactory)
+}
+
+func componentFactory() android.Module {
+	m := &component{}
+	m.AddProperties(&m.properties)
+	android.InitAndroidArchModule(m, android.DeviceSupported, android.MultilibCommon)
+	return m
+}
+
+type component struct {
+	android.ModuleBase
+	properties struct {
+		Install_copy_in_data []string
+	}
+}
+
+func (c *component) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+	output := android.PathForModuleOut(ctx, c.Name())
+	dir := android.PathForModuleInstall(ctx, "components")
+	ctx.InstallFile(dir, c.Name(), output)
+
+	dataDir := android.PathForModuleInPartitionInstall(ctx, "data", "components")
+	for _, d := range c.properties.Install_copy_in_data {
+		ctx.InstallFile(dataDir, d, output)
+	}
+}
+
+func TestFileSystemGathersItemsOnlyInSystemPartition(t *testing.T) {
+	f := android.GroupFixturePreparers(fixture, android.FixtureRegisterWithContext(registerComponent))
+	result := f.RunTestWithBp(t, `
+		android_system_image {
+			name: "myfilesystem",
+			multilib: {
+				common: {
+					deps: ["foo"],
+				},
+			},
+			linker_config_src: "linker.config.json",
+		}
+		component {
+			name: "foo",
+			install_copy_in_data: ["bar"],
+		}
+	`)
+
+	module := result.ModuleForTests("myfilesystem", "android_common").Module().(*systemImage)
+	android.AssertDeepEquals(t, "entries should have foo only", []string{"components/foo"}, module.entries)
+}
diff --git a/filesystem/system_image.go b/filesystem/system_image.go
index 1d24d6d..75abf70 100644
--- a/filesystem/system_image.go
+++ b/filesystem/system_image.go
@@ -37,6 +37,7 @@
 	module := &systemImage{}
 	module.AddProperties(&module.properties)
 	module.filesystem.buildExtraFiles = module.buildExtraFiles
+	module.filesystem.filterPackagingSpecs = module.filterPackagingSpecs
 	initFilesystemModule(&module.filesystem)
 	return module
 }
@@ -53,7 +54,7 @@
 
 	// we need "Module"s for packaging items
 	var otherModules []android.Module
-	deps := s.GatherPackagingSpecs(ctx)
+	deps := s.gatherFilteredPackagingSpecs(ctx)
 	ctx.WalkDeps(func(child, parent android.Module) bool {
 		for _, ps := range child.PackagingSpecs() {
 			if _, ok := deps[ps.RelPathInPackage()]; ok {
@@ -68,3 +69,14 @@
 	builder.Build("conv_linker_config", "Generate linker config protobuf "+output.String())
 	return output
 }
+
+// Filter the result of GatherPackagingSpecs to discard items targeting outside "system" partition.
+// Note that "apex" module installs its contents to "apex"(fake partition) as well
+// for symbol lookup by imitating "activated" paths.
+func (s *systemImage) filterPackagingSpecs(specs map[string]android.PackagingSpec) {
+	for k, ps := range specs {
+		if ps.Partition() != "system" {
+			delete(specs, k)
+		}
+	}
+}
diff --git a/snapshot/host_fake_snapshot.go b/snapshot/host_fake_snapshot.go
index 1a75f3a..b04657d 100644
--- a/snapshot/host_fake_snapshot.go
+++ b/snapshot/host_fake_snapshot.go
@@ -68,6 +68,12 @@
 	registerHostSnapshotComponents(android.InitRegistrationContext)
 }
 
+// Add prebuilt information to snapshot data
+type hostSnapshotFakeJsonFlags struct {
+	SnapshotJsonFlags
+	Prebuilt bool `json:",omitempty"`
+}
+
 func registerHostSnapshotComponents(ctx android.RegistrationContext) {
 	ctx.RegisterSingletonType("host-fake-snapshot", HostToolsFakeAndroidSingleton)
 }
@@ -94,7 +100,9 @@
 	// Find all host binary modules add 'fake' versions to snapshot
 	var outputs android.Paths
 	seen := make(map[string]bool)
-	var jsonData []SnapshotJsonFlags
+	var jsonData []hostSnapshotFakeJsonFlags
+	prebuilts := make(map[string]bool)
+
 	ctx.VisitAllModules(func(module android.Module) {
 		if module.Target().Os != ctx.Config().BuildOSTarget.Os {
 			return
@@ -104,9 +112,10 @@
 		}
 
 		if android.IsModulePrebuilt(module) {
+			// Add non-prebuilt module name to map of prebuilts
+			prebuilts[android.RemoveOptionalPrebuiltPrefix(module.Name())] = true
 			return
 		}
-
 		if !module.Enabled() || module.IsHideFromMake() {
 			return
 		}
@@ -120,11 +129,17 @@
 			if !seen[outFile] {
 				seen[outFile] = true
 				outputs = append(outputs, WriteStringToFileRule(ctx, "", outFile))
-				jsonData = append(jsonData, *hostJsonDesc(module))
+				jsonData = append(jsonData, hostSnapshotFakeJsonFlags{*hostJsonDesc(module), false})
 			}
 		}
 	})
-
+	// Update any module prebuilt information
+	for idx, _ := range jsonData {
+		if _, ok := prebuilts[jsonData[idx].ModuleName]; ok {
+			// Prebuilt exists for this module
+			jsonData[idx].Prebuilt = true
+		}
+	}
 	marsh, err := json.Marshal(jsonData)
 	if err != nil {
 		ctx.Errorf("host fake snapshot json marshal failure: %#v", err)