mirror of
https://github.com/dart-lang/sdk
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b4b0868b40
Change-Id: Id4375435ffeda6a442dc6963323d8d494e8344ff Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/242360 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
88 lines
2.6 KiB
Dart
88 lines
2.6 KiB
Dart
// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart=2.9
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import 'dart:convert';
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import 'dart:io';
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import 'package:compiler/src/dart2js.dart' as dart2js;
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Future<void> main(List<String> args) async {
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if (args.contains('--child')) {
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return;
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}
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// Include dart2js and prevent tree-shaking to make this program have a
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// non-trival snapshot size.
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if (args.contains('--train')) {
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args.remove('--train');
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return dart2js.main(args);
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}
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var tempDir;
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var events;
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try {
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tempDir = await Directory.systemTemp.createTemp();
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final timelinePath =
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tempDir.uri.resolve('Startup-timeline.json').toFilePath();
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final p = await Process.run(Platform.executable, [
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...Platform.executableArguments,
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'--timeline_recorder=file:$timelinePath',
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'--timeline_streams=VM,Isolate,Embedder',
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Platform.script.toFilePath(),
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'--child'
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]);
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if (p.exitCode != 0) {
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print(p.stdout);
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print(p.stderr);
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throw 'Child process failed: ${p.exitCode}';
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}
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events = jsonDecode(await File(timelinePath).readAsString());
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} finally {
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await tempDir.delete(recursive: true);
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}
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var mainIsolateId;
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for (final event in events) {
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if (event['name'] == 'InitializeIsolate' &&
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event['args']['isolateName'] == 'main') {
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mainIsolateId = event['args']['isolateId'];
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}
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}
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if (mainIsolateId == null) {
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throw 'Could not determine main isolate';
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}
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void report(String name, String isolateId) {
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var filtered = events.where((event) => event['name'] == name);
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if (isolateId != null) {
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filtered =
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filtered.where((event) => event['args']['isolateId'] == isolateId);
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}
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var micros;
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final durations = filtered.where((event) => event['ph'] == 'X');
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final begins = filtered.where((event) => event['ph'] == 'B');
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final ends = filtered.where((event) => event['ph'] == 'E');
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if (durations.length == 1 && begins.length == 0 && ends.length == 0) {
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micros = durations.single['dur'];
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} else if (durations.length == 0 &&
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begins.length == 1 &&
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ends.length == 1) {
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micros = ends.single['ts'] - begins.single['ts'];
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} else {
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print(durations.toList());
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print(begins.toList());
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print(ends.toList());
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throw '$name is missing or ambiguous';
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}
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print('Startup.$name(StartupTime): $micros us.');
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}
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report('CreateIsolateGroupAndSetupHelper', null);
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report('InitializeIsolate', mainIsolateId);
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report('ReadProgramSnapshot', mainIsolateId);
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}
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