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102 lines
2.9 KiB
Dart
102 lines
2.9 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'dart:convert';
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import 'utils.dart';
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void _checkExitCode(int code) {
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if (code != 0) {
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throw Exception(
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'Unexpected exit code = $code!',
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);
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}
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}
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Future<void> _execAndCheck(String executable, List<String> args) async {
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_checkExitCode(await exec(executable, args));
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}
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// Measure the CPU/GPU percentage for [duration] while a Flutter app is running
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// on an iOS device (e.g., right after a Flutter driver test has finished, which
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// doesn't close the Flutter app, and the Flutter app has an indefinite
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// animation). The return should have a format like the following json
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// ```
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// {"gpu_percentage":12.6,"cpu_percentage":18.15}
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// ```
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Future<Map<String, dynamic>> measureIosCpuGpu({
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Duration duration = const Duration(seconds: 10),
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String deviceId,
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}) async {
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await _execAndCheck('pub', <String>[
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'global',
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'activate',
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'gauge',
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'0.1.5',
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]);
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await _execAndCheck('pub', <String>[
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'global',
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'run',
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'gauge',
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'ioscpugpu',
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'new',
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if (deviceId != null) ...<String>['-w', deviceId],
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'-l',
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'${duration.inMilliseconds}',
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]);
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return json.decode(file('$cwd/result.json').readAsStringSync()) as Map<String, dynamic>;
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}
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Future<String> dylibSymbols(String pathToDylib) {
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return eval('nm', <String>['-g', pathToDylib]);
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}
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Future<String> fileType(String pathToBinary) {
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return eval('file', <String>[pathToBinary]);
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}
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Future<bool> containsBitcode(String pathToBinary) async {
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// See: https://stackoverflow.com/questions/32755775/how-to-check-a-static-library-is-built-contain-bitcode
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final String loadCommands = await eval('otool', <String>[
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'-l',
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pathToBinary,
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]);
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if (!loadCommands.contains('__LLVM')) {
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return false;
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}
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// Presence of the section may mean a bitcode marker was embedded (size=1), but there is no content.
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if (!loadCommands.contains('size 0x0000000000000001')) {
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return true;
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}
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// Check the false positives: size=1 wasn't referencing the __LLVM section.
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bool emptyBitcodeMarkerFound = false;
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// Section
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// sectname __bundle
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// segname __LLVM
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// addr 0x003c4000
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// size 0x0042b633
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// offset 3932160
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// ...
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final List<String> lines = LineSplitter.split(loadCommands).toList();
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lines.asMap().forEach((int index, String line) {
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if (line.contains('segname __LLVM') && lines.length - index - 1 > 3) {
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final String emptyBitcodeMarker = lines
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.skip(index - 1)
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.take(3)
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.firstWhere(
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(String line) => line.contains(' size 0x0000000000000001'),
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orElse: () => null,
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);
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if (emptyBitcodeMarker != null) {
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emptyBitcodeMarkerFound = true;
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return;
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}
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}
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});
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return !emptyBitcodeMarkerFound;
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}
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