Merge changes I45274836,I47268b81

* changes:
  Add PrebuiltNameFromSource
  Add IsModulePreferred

android/prebuilt.go

@@ -82,6 +82,12 @@ func RemoveOptionalPrebuiltPrefix(name string) string {
 }
 
 func (p *Prebuilt) Name(name string) string {
+	return PrebuiltNameFromSource(name)
+}
+
+// PrebuiltNameFromSource returns the result of prepending the "prebuilt_" prefix to the supplied
+// name.
+func PrebuiltNameFromSource(name string) string {
 	return "prebuilt_" + name
 }
 
@@ -213,6 +219,26 @@ type PrebuiltInterface interface {
 	Prebuilt() *Prebuilt
 }
 
+// IsModulePreferred returns true if the given module is preferred.
+//
+// A source module is preferred if there is no corresponding prebuilt module or the prebuilt module
+// does not have "prefer: true".
+//
+// A prebuilt module is preferred if there is no corresponding source module or the prebuilt module
+// has "prefer: true".
+func IsModulePreferred(module Module) bool {
+	if module.IsReplacedByPrebuilt() {
+		// A source module that has been replaced by a prebuilt counterpart.
+		return false
+	}
+	if prebuilt, ok := module.(PrebuiltInterface); ok {
+		if p := prebuilt.Prebuilt(); p != nil {
+			return p.UsePrebuilt()
+		}
+	}
+	return true
+}
+
 func RegisterPrebuiltsPreArchMutators(ctx RegisterMutatorsContext) {
 	ctx.BottomUp("prebuilt_rename", PrebuiltRenameMutator).Parallel()
 }

apex/prebuilt.go

@@ -250,7 +250,7 @@ func prebuiltApexExportedModuleName(ctx android.BottomUpMutatorContext, name str
 	// the unprefixed name is the one to use. If the unprefixed one turns out to be a source module
 	// and not a renamed prebuilt module then that will be detected and reported as an error when
 	// processing the dependency in ApexInfoMutator().
-	prebuiltName := "prebuilt_" + name
+	prebuiltName := android.PrebuiltNameFromSource(name)
 	if ctx.OtherModuleExists(prebuiltName) {
 		name = prebuiltName
 	}

java/boot_jars.go

@@ -56,16 +56,7 @@ func isActiveModule(module android.Module) bool {
 	if !module.Enabled() {
 		return false
 	}
-	if module.IsReplacedByPrebuilt() {
-		// A source module that has been replaced by a prebuilt counterpart.
-		return false
-	}
-	if prebuilt, ok := module.(android.PrebuiltInterface); ok {
-		if p := prebuilt.Prebuilt(); p != nil {
-			return p.UsePrebuilt()
-		}
-	}
-	return true
+	return android.IsModulePreferred(module)
 }
 
 func (b *bootJarsSingleton) GenerateBuildActions(ctx android.SingletonContext) {

java/platform_compat_config.go

@@ -232,15 +232,7 @@ func isModulePreferredByCompatConfig(module android.Module) bool {
 		}
 	}
 
-	// A prebuilt module should only be used when it is preferred.
-	if pi, ok := module.(android.PrebuiltInterface); ok {
-		if p := pi.Prebuilt(); p != nil {
-			return p.UsePrebuilt()
-		}
-	}
-
-	// Otherwise, a module should only be used if it has not been replaced by a prebuilt.
-	return !module.IsReplacedByPrebuilt()
+	return android.IsModulePreferred(module)
 }
 
 func (p *platformCompatConfigSingleton) GenerateBuildActions(ctx android.SingletonContext) {

java/sdk_library.go

@@ -1945,11 +1945,11 @@ func (module *SdkLibraryImport) ComponentDepsMutator(ctx android.BottomUpMutator
 		}
 
 		// Add dependencies to the prebuilt stubs library
-		ctx.AddVariationDependencies(nil, apiScope.stubsTag, "prebuilt_"+module.stubsLibraryModuleName(apiScope))
+		ctx.AddVariationDependencies(nil, apiScope.stubsTag, android.PrebuiltNameFromSource(module.stubsLibraryModuleName(apiScope)))
 
 		if len(scopeProperties.Stub_srcs) > 0 {
 			// Add dependencies to the prebuilt stubs source library
-			ctx.AddVariationDependencies(nil, apiScope.stubsSourceTag, "prebuilt_"+module.stubsSourceModuleName(apiScope))
+			ctx.AddVariationDependencies(nil, apiScope.stubsSourceTag, android.PrebuiltNameFromSource(module.stubsSourceModuleName(apiScope)))
 		}
 	}
 }

java/system_modules.go

@@ -236,7 +236,7 @@ func (system *systemModulesImport) Prebuilt() *android.Prebuilt {
 // modules.
 func (system *systemModulesImport) ComponentDepsMutator(ctx android.BottomUpMutatorContext) {
 	for _, lib := range system.properties.Libs {
-		ctx.AddVariationDependencies(nil, systemModulesLibsTag, "prebuilt_"+lib)
+		ctx.AddVariationDependencies(nil, systemModulesLibsTag, android.PrebuiltNameFromSource(lib))
 	}
 }