[flutter_tools] Apply --no-causal-async-stacks and --lazy-async-stacks to profile/release builds (#49377)

packages/flutter_tools/lib/src/base/build.dart

@@ -49,7 +49,6 @@ class GenSnapshot {
     Iterable<String> additionalArgs = const <String>[],
   }) {
     final List<String> args = <String>[
-      '--causal_async_stacks',
       ...additionalArgs,
     ];
 
@@ -156,6 +155,13 @@ class AOTSnapshotter {
       genSnapshotArgs.add('--no-use-integer-division');
     }
 
+    // Optimization arguments.
+    genSnapshotArgs.addAll(<String>[
+      // Faster async/await
+      '--no-causal-async-stacks',
+      '--lazy-async-stacks',
+    ]);
+
     genSnapshotArgs.add(mainPath);
 
     // TODO(jonahwilliams): fully remove input checks once all callers are

packages/flutter_tools/lib/src/codegen.dart

@@ -95,7 +95,6 @@ class CodeGeneratingKernelCompiler implements KernelCompiler {
     bool linkPlatformKernelIn = false,
     bool aot = false,
     @required BuildMode buildMode,
-    bool causalAsyncStacks = true,
     bool trackWidgetCreation,
     List<String> extraFrontEndOptions,
     // These arguments are currently unused.
@@ -133,7 +132,6 @@ class CodeGeneratingKernelCompiler implements KernelCompiler {
       linkPlatformKernelIn: linkPlatformKernelIn,
       aot: aot,
       buildMode: buildMode,
-      causalAsyncStacks: causalAsyncStacks,
       trackWidgetCreation: trackWidgetCreation,
       extraFrontEndOptions: extraFrontEndOptions,
       sdkRoot: sdkRoot,

packages/flutter_tools/lib/src/compile.dart

@@ -277,7 +277,6 @@ class KernelCompiler {
     @required BuildMode buildMode,
     bool linkPlatformKernelIn = false,
     bool aot = false,
-    bool causalAsyncStacks = true,
     @required bool trackWidgetCreation,
     List<String> extraFrontEndOptions,
     String packagesPath,
@@ -313,7 +312,7 @@ class KernelCompiler {
       '--sdk-root',
       sdkRoot,
       '--target=$targetModel',
-      '-Ddart.developer.causal_async_stacks=$causalAsyncStacks',
+      '-Ddart.developer.causal_async_stacks=${buildMode == BuildMode.debug}',
       for (final Object dartDefine in dartDefines)
         '-D$dartDefine',
       ..._buildModeOptions(buildMode),
@@ -451,7 +450,6 @@ class _RejectRequest extends _CompilationRequest {
 abstract class ResidentCompiler {
   factory ResidentCompiler(String sdkRoot, {
     @required BuildMode buildMode,
-    bool causalAsyncStacks,
     bool trackWidgetCreation,
     String packagesPath,
     List<String> fileSystemRoots,
@@ -512,7 +510,6 @@ class DefaultResidentCompiler implements ResidentCompiler {
   DefaultResidentCompiler(
     String sdkRoot, {
     @required this.buildMode,
-    this.causalAsyncStacks = true,
     this.trackWidgetCreation = true,
     this.packagesPath,
     this.fileSystemRoots,
@@ -531,7 +528,6 @@ class DefaultResidentCompiler implements ResidentCompiler {
        sdkRoot = sdkRoot.endsWith('/') ? sdkRoot : '$sdkRoot/';
 
   final BuildMode buildMode;
-  final bool causalAsyncStacks;
   final bool trackWidgetCreation;
   final String packagesPath;
   final TargetModel targetModel;
@@ -651,7 +647,7 @@ class DefaultResidentCompiler implements ResidentCompiler {
       sdkRoot,
       '--incremental',
       '--target=$targetModel',
-      '-Ddart.developer.causal_async_stacks=$causalAsyncStacks',
+      '-Ddart.developer.causal_async_stacks=${buildMode == BuildMode.debug}',
       for (final Object dartDefine in dartDefines)
         '-D$dartDefine',
       if (outputPath != null) ...<String>[

packages/flutter_tools/lib/src/fuchsia/fuchsia_build.dart

@@ -98,7 +98,8 @@ Future<void> _genSnapshot(
 
   final List<String> command = <String>[
     genSnapshot,
-    '--no_causal_async_stacks',
+    '--no-causal-async-stacks',
+    '--lazy-async-stacks',
     '--deterministic',
     '--snapshot_kind=app-aot-blobs',
     '--vm_snapshot_data=$vmSnapshotData',

packages/flutter_tools/lib/src/fuchsia/fuchsia_kernel_compiler.dart

@@ -71,6 +71,7 @@ class FuchsiaKernelCompiler {
 
       if (buildInfo.isProfile) '-Ddart.vm.profile=true',
       if (buildInfo.mode.isRelease) '-Ddart.vm.release=true',
+      '-Ddart.developer.causal_async_stacks=${buildInfo.isDebug}',
 
       // Use bytecode and drop the ast in JIT release mode.
       if (buildInfo.isJitRelease) ...<String>[

packages/flutter_tools/test/general.shard/base/build_test.dart

@@ -121,7 +121,6 @@ void main() {
       verify(mockProcessManager.start(
         <String>[
           'gen_snapshot',
-          '--causal_async_stacks',
           '--additional_arg',
         ],
         workingDirectory: anyNamed('workingDirectory'),
@@ -146,7 +145,6 @@ void main() {
       verify(mockProcessManager.start(
         <String>[
           'gen_snapshot_armv7',
-          '--causal_async_stacks',
           '--additional_arg',
         ],
         workingDirectory: anyNamed('workingDirectory'),
@@ -171,7 +169,6 @@ void main() {
       verify(mockProcessManager.start(
         <String>[
           'gen_snapshot_arm64',
-          '--causal_async_stacks',
           '--additional_arg',
         ],
         workingDirectory: anyNamed('workingDirectory'),
@@ -184,7 +181,7 @@ void main() {
               platform: TargetPlatform.android_x64, mode: BuildMode.release))
           .thenReturn('gen_snapshot');
       when(mockProcessManager.start(
-              <String>['gen_snapshot', '--causal_async_stacks', '--strip'],
+              <String>['gen_snapshot', '--strip'],
               workingDirectory: anyNamed('workingDirectory'),
               environment: anyNamed('environment')))
           .thenAnswer((_) => Future<Process>.value(mockProc));
@@ -202,7 +199,7 @@ void main() {
           darwinArch: null,
           additionalArgs: <String>['--strip']);
       verify(mockProcessManager.start(
-              <String>['gen_snapshot', '--causal_async_stacks', '--strip'],
+              <String>['gen_snapshot', '--strip'],
               workingDirectory: anyNamed('workingDirectory'),
               environment: anyNamed('environment')))
           .called(1);
@@ -331,6 +328,8 @@ void main() {
         '--assembly=$assembly',
         '--no-sim-use-hardfp',
         '--no-use-integer-division',
+        '--no-causal-async-stacks',
+        '--lazy-async-stacks',
         'main.dill',
       ]);
 
@@ -388,6 +387,8 @@ void main() {
         '--assembly=$assembly',
         '--no-sim-use-hardfp',
         '--no-use-integer-division',
+        '--no-causal-async-stacks',
+        '--lazy-async-stacks',
         'main.dill',
       ]);
 
@@ -448,6 +449,8 @@ void main() {
         '--assembly=$assembly',
         '--no-sim-use-hardfp',
         '--no-use-integer-division',
+        '--no-causal-async-stacks',
+        '--lazy-async-stacks',
         'main.dill',
       ]);
       verifyNever(mockXcode.cc(argThat(contains('-fembed-bitcode'))));
@@ -493,6 +496,8 @@ void main() {
         '--deterministic',
         '--snapshot_kind=app-aot-assembly',
         '--assembly=${globals.fs.path.join(outputPath, 'snapshot_assembly.S')}',
+        '--no-causal-async-stacks',
+        '--lazy-async-stacks',
         'main.dill',
       ]);
     }, overrides: contextOverrides);
@@ -531,6 +536,8 @@ void main() {
         '--assembly=${globals.fs.path.join(outputPath, 'snapshot_assembly.S')}',
         '--no-sim-use-hardfp',
         '--no-use-integer-division',
+        '--no-causal-async-stacks',
+        '--lazy-async-stacks',
         'main.dill',
       ]);
     }, overrides: contextOverrides);
@@ -567,6 +574,8 @@ void main() {
         '--deterministic',
         '--snapshot_kind=app-aot-assembly',
         '--assembly=${globals.fs.path.join(outputPath, 'snapshot_assembly.S')}',
+        '--no-causal-async-stacks',
+        '--lazy-async-stacks',
         'main.dill',
       ]);
     }, overrides: contextOverrides);
@@ -597,6 +606,8 @@ void main() {
         '--strip',
         '--no-sim-use-hardfp',
         '--no-use-integer-division',
+        '--no-causal-async-stacks',
+        '--lazy-async-stacks',
         'main.dill',
       ]);
     }, overrides: contextOverrides);
@@ -625,6 +636,8 @@ void main() {
         '--snapshot_kind=app-aot-elf',
         '--elf=build/foo/app.so',
         '--strip',
+        '--no-causal-async-stacks',
+        '--lazy-async-stacks',
         'main.dill',
       ]);
     }, overrides: contextOverrides);

packages/flutter_tools/test/general.shard/compile_batch_test.dart

@@ -64,6 +64,10 @@ void main() {
     expect(mockFrontendServerStdIn.getAndClear(), isEmpty);
     expect(testLogger.errorText, equals('\nCompiler message:\nline1\nline2\n'));
     expect(output.outputFilename, equals('/path/to/main.dart.dill'));
+    final VerificationResult argVerification = verify(mockProcessManager.start(captureAny));
+    expect(argVerification.captured.single, containsAll(<String>[
+      '-Ddart.developer.causal_async_stacks=true',
+    ]));
   }, overrides: <Type, Generator>{
     ProcessManager: () => mockProcessManager,
     OutputPreferences: () => OutputPreferences(showColor: false),
@@ -94,6 +98,7 @@ void main() {
       '-Ddart.vm.profile=true',
       '-Ddart.vm.product=false',
       '--bytecode-options=source-positions',
+      '-Ddart.developer.causal_async_stacks=false',
     ]));
   }, overrides: <Type, Generator>{
     ProcessManager: () => mockProcessManager,
@@ -126,6 +131,7 @@ void main() {
       '-Ddart.vm.profile=false',
       '-Ddart.vm.product=true',
       '--bytecode-options=source-positions',
+      '-Ddart.developer.causal_async_stacks=false',
     ]));
   }, overrides: <Type, Generator>{
     ProcessManager: () => mockProcessManager,