blob: 5599fc05636bd2a574e3e1b985ed8e35745e82b6 [file] [log] [blame]
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// Shared code used by fasta_perf and incremental_perf.
library front_end.tool.perf_common;
import 'dart:io';
import 'package:front_end/src/api_prototype/front_end.dart';
import 'package:front_end/src/fasta/command_line_reporting.dart';
import 'package:front_end/src/fasta/fasta_codes.dart';
import 'package:kernel/target/flutter.dart' show FlutterTarget;
import 'package:kernel/target/targets.dart' show Target, TargetFlags;
import 'package:kernel/target/vm.dart' show VmTarget;
/// Error messages that we temporarily allow when compiling benchmarks in strong
/// mode.
/// This whitelist lets us run the compiler benchmarks while those errors get
/// fixed. We don't blindly allow any error message because we would then miss
/// situations where the benchmarks are actually broken.
/// Note: the performance bots compile both dart2js and the flutter-gallery app
/// as benchmarks, so they both need to be checked before we remove a message
/// from this set.
final whitelistMessageCode = new Set<String>.from(<String>[
// Code names in this list should match the key used in messages.yaml,,,
// The following errors are not covered by unit tests in the SDK repo because
// they are only seen today in the flutter-gallery benchmark (external to
// this repo).,,,,
onErrorHandler(bool isStrong) {
bool messageReported = false;
return (CompilationMessage m) {
if (m.severity == Severity.internalProblem ||
m.severity == Severity.error) {
if (!isStrong || !whitelistMessageCode.contains(m.code)) {
var uri = m.span.start.sourceUrl;
var offset = m.span.start.offset;
stderr.writeln('$uri:$offset: '
'${severityName(m.severity, capitalized: true)}: ${m.message}');
exitCode = 1;
} else if (!messageReported) {
messageReported = true;
stderr.writeln('Whitelisted error messages omitted');
/// Creates a [VmTarget] or [FlutterTarget] with strong-mode enabled or
/// disabled.
// TODO(sigmund): delete as soon as the disableTypeInference flag and the
// strongMode flag get merged, and we have a single way of specifying the
// strong-mode flag to the FE.
Target createTarget({bool isFlutter: false, bool strongMode: true}) {
var flags = new TargetFlags(strongMode: strongMode);
if (isFlutter) {
return strongMode
? new FlutterTarget(flags)
: new LegacyFlutterTarget(flags);
} else {
return strongMode ? new VmTarget(flags) : new LegacyVmTarget(flags);
class LegacyVmTarget extends VmTarget {
LegacyVmTarget(TargetFlags flags) : super(flags);
bool get disableTypeInference => true;
class LegacyFlutterTarget extends FlutterTarget {
LegacyFlutterTarget(TargetFlags flags) : super(flags);
bool get disableTypeInference => true;
class TimingsCollector {
final Stopwatch stopwatch = new Stopwatch();
final Map<String, List<double>> timings = <String, List<double>>{};
final bool verbose;
String currentKey;
void start(String key) {
if (currentKey != null) {
throw "Attempt to time '$key' while '$currentKey' is running.";
currentKey = key;
void stop(String key) {
if (currentKey == null) {
throw "Need to call 'start' before calling 'stop'.";
if (currentKey != key) {
throw "Can't stop timing '$key' because '$currentKey' is running.";
currentKey = null;
double duration =
stopwatch.elapsedMicroseconds / Duration.microsecondsPerMillisecond;
List<double> durations = (timings[key] ??= <double>[]);
if (verbose) {
print("$key took: ${duration}ms");
void printTimings() {
timings.forEach((String key, List<double> durations) {
double total = 0.0;
for (double duration in durations.skip(3)) {
total += duration;
print("$key took: ${total/(durations.length - 3)}ms");