all_aconfig_declarations: record finalized flags

Teach all_aconfig_declarations to create an artifact that records all
flags used with @FlaggedApi that are currently slated for inclusion in
the next API finalization. The actual data processing is offloaded to a
new tool, record-finalized-flags. The artifact will be stored in the
prebuilts/sdk/<version>/ directories.

Bug: 377676163
Test: m sdk dist && test -e out/dist/finalized-flags.txt
Change-Id: Iacd7c1d61ca35a4cfae9d83006331fe81337045e

3 files changed, 42 insertions, 1 deletions

diff --git a/aconfig/Android.bp b/aconfig/Android.bp
index 1fe417e7a..1505ba55e 100644
--- a/aconfig/Android.bp
+++ b/aconfig/Android.bp
@@ -31,4 +31,10 @@ bootstrap_go_package {
 
 all_aconfig_declarations {
     name: "all_aconfig_declarations",
+    api_files: [
+        ":frameworks-base-api-current.txt",
+        ":frameworks-base-api-system-current.txt",
+        ":frameworks-base-api-system-server-current.txt",
+        ":frameworks-base-api-module-lib-current.txt",
+    ],
 }
diff --git a/aconfig/all_aconfig_declarations.go b/aconfig/all_aconfig_declarations.go
index 05cb065cc..bb906077a 100644
--- a/aconfig/all_aconfig_declarations.go
+++ b/aconfig/all_aconfig_declarations.go
@@ -30,7 +30,8 @@ import (
 // doesn't need to pull from multiple builds and merge them.
 func AllAconfigDeclarationsFactory() android.SingletonModule {
 	module := &allAconfigDeclarationsSingleton{releaseMap: make(map[string]allAconfigReleaseDeclarationsSingleton)}
-	android.InitAndroidModule(module)
+	module.AddProperties(&module.properties)
+	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibCommon)
 	return module
 }
 
@@ -39,10 +40,15 @@ type allAconfigReleaseDeclarationsSingleton struct {
 	intermediateTextProtoPath   android.OutputPath
 }
 
+type allAconfigReleaseDeclarationsProperties struct {
+	Api_files []string `android:"arch_variant,path"`
+}
+
 type allAconfigDeclarationsSingleton struct {
 	android.SingletonModuleBase
 
 	releaseMap map[string]allAconfigReleaseDeclarationsSingleton
+	properties allAconfigReleaseDeclarationsProperties
 }
 
 func (this *allAconfigDeclarationsSingleton) sortedConfigNames() []string {
@@ -55,6 +61,26 @@ func (this *allAconfigDeclarationsSingleton) sortedConfigNames() []string {
 }
 
 func (this *allAconfigDeclarationsSingleton) GenerateAndroidBuildActions(ctx android.ModuleContext) {
+	apiFiles := android.Paths{}
+	for _, apiFile := range this.properties.Api_files {
+		if path := android.PathForModuleSrc(ctx, apiFile); path != nil {
+			apiFiles = append(apiFiles, path)
+		}
+	}
+	flagFile := android.PathForIntermediates(ctx, "all_aconfig_declarations.pb")
+
+	output := android.PathForIntermediates(ctx, "finalized-flags.txt")
+
+	ctx.Build(pctx, android.BuildParams{
+		Rule:   RecordFinalizedFlagsRule,
+		Inputs: append(apiFiles, flagFile),
+		Output: output,
+		Args: map[string]string{
+			"api_files": android.JoinPathsWithPrefix(apiFiles, "--api-file "),
+			"flag_file": "--flag-file " + flagFile.String(),
+		},
+	})
+	ctx.Phony("all_aconfig_declarations", output)
 }
 
 func (this *allAconfigDeclarationsSingleton) GenerateSingletonBuildActions(ctx android.SingletonContext) {
@@ -123,4 +149,5 @@ func (this *allAconfigDeclarationsSingleton) MakeVars(ctx android.MakeVarsContex
 			ctx.DistForGoalWithFilename(goal, this.releaseMap[rcName].intermediateTextProtoPath, assembleFileName(rcName, "flags.textproto"))
 		}
 	}
+	ctx.DistForGoalWithFilename("sdk", android.PathForIntermediates(ctx, "finalized-flags.txt"), "finalized-flags.txt")
 }
diff --git a/aconfig/init.go b/aconfig/init.go
index 519d50264..e221153a7 100644
--- a/aconfig/init.go
+++ b/aconfig/init.go
@@ -70,6 +70,13 @@ var (
 				"${aconfig}",
 			},
 		}, "cache_files")
+	RecordFinalizedFlagsRule = pctx.AndroidStaticRule("RecordFinalizedFlagsRule",
+		blueprint.RuleParams{
+			Command: `${record-finalized-flags} ${flag_file} ${api_files} > ${out}`,
+			CommandDeps: []string{
+				"${record-finalized-flags}",
+			},
+		}, "api_files", "flag_file")
 
 	CreateStorageRule = pctx.AndroidStaticRule("aconfig_create_storage",
 		blueprint.RuleParams{
@@ -112,6 +119,7 @@ func init() {
 	RegisterBuildComponents(android.InitRegistrationContext)
 	pctx.HostBinToolVariable("aconfig", "aconfig")
 	pctx.HostBinToolVariable("soong_zip", "soong_zip")
+	pctx.HostBinToolVariable("record-finalized-flags", "record-finalized-flags")
 }
 
 func RegisterBuildComponents(ctx android.RegistrationContext) {