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![Eric Seidel](/assets/img/avatar_default.png)
Now that I'm able to open the entire SDK in VSC, I'm fixing some of the analysis issues in various files (carefully) without changing their meaning. In this case, I removed unnecessary imports from benchmarks. In regexp_benchmark I ignored one warning which likely would have changed the behavior of the code. BUG=https://github.com/dart-lang/sdk/issues/52419 Change-Id: I9a195a4e45121313bd9f065f2579a165c3fec05b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/303901 Auto-Submit: Eric Seidel <eric@shorebird.dev> Reviewed-by: William Hesse <whesse@google.com> Commit-Queue: William Hesse <whesse@google.com>
124 lines
4.1 KiB
Dart
124 lines
4.1 KiB
Dart
// Copyright (c) 2023, 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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/// This benchmark compares a large switch statement on various kinds of
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/// values. The switch statement is part of a finite-state-machine (FSM)
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/// recognizer.
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///
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/// There are four copies of the same code, differing only by importing
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/// different declarations of the type `State` which makes the same constant
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/// names available using different types.
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///
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/// The switch dispatch on the following types is benchmarked:
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///
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/// - a compact range of `int` values,
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/// - an enum,
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/// - a class that is a bit like an `enum` but not declared as an enum,
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/// - strings.
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///
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/// The actual state-machine is somewhat aritificial. It recognizes a character
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/// string of '0' and '1' character 'bits' that encode a valid UTF-8 string. The
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/// state machine has 48 states and minimal logic in most states, so that as
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/// much time as possible is executing the switch dispatch.
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///
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/// The data is passed to the recogizer as a Uint8List to minimize the time to
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/// access the bytes of the ASCII '0' / '1' character input sequence.
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import 'dart:typed_data';
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import 'package:benchmark_harness/benchmark_harness.dart';
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import 'package:expect/expect.dart';
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import 'match_class.dart' as match_class;
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import 'match_enum.dart' as match_enum;
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import 'match_int.dart' as match_int;
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import 'match_string.dart' as match_string;
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class Benchmark extends BenchmarkBase {
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final bool Function(Uint8List) match;
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Benchmark(String kind, this.match) : super('SwitchFSM.$kind');
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void validation() {
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void check(String s, bool expected) {
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Expect.equals(expected, match(convert(s)), '"$s"');
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}
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check('', true);
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check('0', false);
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check('00', false);
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check('000', false);
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check('0000', false);
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check('00000', false);
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check('000000', false);
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check('0000000', false);
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check('00000000', true);
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check('01010101', true);
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check('10000000', false);
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check('001010101', false);
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check('11000000' '00000000', false);
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check('11000000' '10111111', true);
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check('11000000' '11111111', false);
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check('11100000' '00000000' '00000000', false);
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check('11100000' '10000000' '00000000', false);
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check('11100000' '10111111' '10111111', true);
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check('11110111' '10111111' '10111111' '01111111', false);
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check('11110111' '10111111' '10111111' '10111111', true);
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Expect.equals(testInputLength, testInput.length);
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}
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static const testInputLength = 1000;
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static final Uint8List testInput = convert(makeTestInput(testInputLength));
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static String makeTestInput(int length) {
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// The test input uses most states of the FSM. It is repeated and padded to
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// make the length 1000.
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final testPattern = ''
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'11110111101111111011111110111111'
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'111011111011111110111111'
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'1101111110111111';
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final paddingPattern = '00000000';
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final repeats = testPattern * (length ~/ testPattern.length);
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final padding =
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paddingPattern * ((length - repeats.length) ~/ paddingPattern.length);
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return repeats + padding;
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}
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static Uint8List convert(String s) => Uint8List.fromList(s.codeUnits);
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@override
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void run() {
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Expect.equals(true, match(testInput));
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}
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}
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enum SomeEnum { element }
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void main() {
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// TODO(http://dartbug.com/51657): dart2js will remove `_Enum.index` in simple
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// programs that don't appear to use the field. This defeats the enum-switch
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// optimization that works more reliably in larger programs. Remove this code
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// that marks `_Enum.index` as used when #51657 is fixed.
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Expect.equals(0, SomeEnum.element.index);
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final benchmarks = [
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Benchmark('enum', match_enum.match),
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Benchmark('int', match_int.match),
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Benchmark('class', match_class.match),
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Benchmark('string', match_string.match),
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];
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for (final benchmark in benchmarks) {
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benchmark.validation();
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}
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for (final benchmark in benchmarks) {
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benchmark.warmup();
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}
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for (final benchmark in benchmarks) {
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benchmark.report();
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}
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}
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