[flutter_tools] Fix analyze size on arm64 (#141317)

Fixes https://github.com/flutter/flutter/issues/140659

packages/flutter_tools/lib/src/build_system/targets/macos.dart

@@ -455,22 +455,22 @@ abstract class MacOSBundleFlutterAssets extends Target {
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>en</string>
-	<key>CFBundleExecutable</key>
-	<string>App</string>
-	<key>CFBundleIdentifier</key>
-	<string>io.flutter.flutter.app</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>App</string>
-	<key>CFBundlePackageType</key>
-	<string>FMWK</string>
-	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
-	<key>CFBundleVersion</key>
-	<string>1.0</string>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
 </dict>
 </plist>
 

packages/flutter_tools/lib/src/macos/build_macos.dart

@@ -181,11 +181,25 @@ Future<void> _writeCodeSizeAnalysis(BuildInfo buildInfo, SizeAnalyzer? sizeAnaly
   if (buildInfo.codeSizeDirectory == null || sizeAnalyzer == null) {
     return;
   }
-  final String arch = DarwinArch.x86_64.name;
-  final File aotSnapshot = globals.fs.directory(buildInfo.codeSizeDirectory)
-    .childFile('snapshot.$arch.json');
-  final File precompilerTrace = globals.fs.directory(buildInfo.codeSizeDirectory)
-    .childFile('trace.$arch.json');
+  final File? aotSnapshot = DarwinArch.values.map<File?>((DarwinArch arch) {
+    return globals.fs.directory(buildInfo.codeSizeDirectory).childFile('snapshot.${arch.name}.json');
+    // Pick the first if there are multiple for simplicity
+  }).firstWhere(
+    (File? file) => file!.existsSync(),
+    orElse: () => null,
+  );
+  if (aotSnapshot == null) {
+    throw StateError('No code size snapshot file (snapshot.<ARCH>.json) found in ${buildInfo.codeSizeDirectory}');
+  }
+  final File? precompilerTrace = DarwinArch.values.map<File?>((DarwinArch arch) {
+    return globals.fs.directory(buildInfo.codeSizeDirectory).childFile('trace.${arch.name}.json');
+  }).firstWhere(
+    (File? file) => file!.existsSync(),
+    orElse: () => null,
+  );
+  if (precompilerTrace == null) {
+    throw StateError('No precompiler trace file (trace.<ARCH>.json) found in ${buildInfo.codeSizeDirectory}');
+  }
 
   // This analysis is only supported for release builds.
   // Attempt to guess the correct .app by picking the first one.

packages/flutter_tools/test/commands.shard/hermetic/build_macos_test.dart

@@ -585,7 +585,49 @@ STDERR STUFF
     Platform: () => macosPlatform,
   });
 
-  testUsingContext('Performs code size analysis and sends analytics', () async {
+  testUsingContext('code size analysis throws StateError if no code size snapshot generated by gen_snapshot', () async {
+    final BuildCommand command = BuildCommand(
+      artifacts: artifacts,
+      androidSdk: FakeAndroidSdk(),
+      buildSystem: TestBuildSystem.all(BuildResult(success: true)),
+      fileSystem: fileSystem,
+      logger: logger,
+      processUtils: processUtils,
+      osUtils: FakeOperatingSystemUtils(),
+    );
+    createMinimalMockProjectFiles();
+
+    fileSystem.file('build/macos/Build/Products/Release/Runner.app/App')
+      ..createSync(recursive: true)
+      ..writeAsBytesSync(List<int>.generate(10000, (int index) => 0));
+
+    expect(
+      () => createTestCommandRunner(command).run(
+        const <String>['build', 'macos', '--no-pub', '--analyze-size']
+      ),
+      throwsA(
+        isA<StateError>().having(
+          (StateError err) => err.message,
+          'message',
+          'No code size snapshot file (snapshot.<ARCH>.json) found in build/flutter_size_01',
+        ),
+      ),
+    );
+
+    expect(testLogger.statusText, isEmpty);
+  }, overrides: <Type, Generator>{
+    FileSystem: () => fileSystem,
+    ProcessManager: () => FakeProcessManager.list(<FakeCommand>[
+      // we never generate code size snapshot here
+      setUpFakeXcodeBuildHandler('Release'),
+    ]),
+    Platform: () => macosPlatform,
+    FeatureFlags: () => TestFeatureFlags(isMacOSEnabled: true),
+    FileSystemUtils: () => FileSystemUtils(fileSystem: fileSystem, platform: macosPlatform),
+    Usage: () => usage,
+    Analytics: () => fakeAnalytics,
+  });
+  testUsingContext('Performs code size analysis and sends analytics from arm64 host', () async {
     final BuildCommand command = BuildCommand(
       artifacts: artifacts,
       androidSdk: FakeAndroidSdk(),
@@ -614,8 +656,10 @@ STDERR STUFF
   }, overrides: <Type, Generator>{
     FileSystem: () => fileSystem,
     ProcessManager: () => FakeProcessManager.list(<FakeCommand>[
+      // These are generated by gen_snapshot because flutter assemble passes
+      // extra flags specifying this output path
       setUpFakeXcodeBuildHandler('Release', onRun: () {
-        fileSystem.file('build/flutter_size_01/snapshot.x86_64.json')
+        fileSystem.file('build/flutter_size_01/snapshot.arm64.json')
           ..createSync(recursive: true)
           ..writeAsStringSync('''
 [
@@ -626,7 +670,7 @@ STDERR STUFF
     "s": 2400
   }
 ]''');
-        fileSystem.file('build/flutter_size_01/trace.x86_64.json')
+        fileSystem.file('build/flutter_size_01/trace.arm64.json')
           ..createSync(recursive: true)
           ..writeAsStringSync('{}');
       }),