| // Copyright (c) 2013, 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. |
| |
| // Print a summary of a profile trace. |
| |
| import 'dart:convert'; |
| import 'dart:io'; |
| |
| class TraceSymbol { |
| final String name; |
| int exclusive = 0; |
| int inclusive = 0; |
| TraceSymbol(this.name); |
| } |
| |
| class TraceSummary { |
| final int numSymbols; |
| |
| Map<String, TraceSymbol> _symbols = {}; |
| List _events = []; |
| List<TraceSymbol> _stack = []; |
| List<TraceSymbol> _topExclusive = []; |
| List<TraceSymbol> _topInclusive = []; |
| bool _marked = false; |
| int _totalSamples = 0; |
| |
| TraceSummary(this.numSymbols); |
| |
| void _processEventsFromFile(String name) { |
| var file = new File(name); |
| var events = []; |
| try { |
| var contents = file.readAsStringSync(); |
| events = JSON.decode(contents); |
| } catch (e) { |
| print('Exception for $name $e'); |
| } |
| _processEvents(events); |
| } |
| |
| void _processBegin(Map event) { |
| var name = event['name']; |
| if (name == '<no frame>') { |
| return; |
| } |
| var symbol = _symbols[name]; |
| if (symbol == null) { |
| symbol = new TraceSymbol(name); |
| _symbols[name] = symbol; |
| } |
| _stack.add(symbol); |
| _marked = false; |
| } |
| |
| void _processEnd(Map event) { |
| var name = event['name']; |
| if (name == '<no frame>') { |
| return; |
| } |
| var symbol = _stack.last; |
| if (symbol.name != name) { |
| throw new StateError('$name not found at top of stack.'); |
| } |
| if ((_stack.length > 1) && (_marked == false)) { |
| // We are transitioning from the sequence of begins to the sequence |
| // of ends. Mark the symbols on the stack. |
| _marked = true; |
| _totalSamples++; |
| // Mark all symbols except the top with an inclusive tick. |
| for (int i = 1; i < _stack.length; i++) { |
| _stack[i].inclusive++; |
| } |
| _stack.last.exclusive++; |
| } |
| _stack.removeLast(); |
| } |
| |
| void _processEvents(List events) { |
| for (var i = 0; i < events.length; i++) { |
| Map event = events[i]; |
| if (event['ph'] == 'M') { |
| // Ignore. |
| } else if (event['ph'] == 'B') { |
| _processBegin(event); |
| } else if (event['ph'] == 'E') { |
| _processEnd(event); |
| } |
| } |
| } |
| |
| void _findTopExclusive() { |
| _topExclusive = _symbols.values.toList(); |
| _topExclusive.sort((a, b) { |
| return b.exclusive - a.exclusive; |
| }); |
| } |
| |
| |
| void _findTopInclusive() { |
| _topInclusive = _symbols.values.toList(); |
| _topInclusive.sort((a, b) { |
| return b.inclusive - a.inclusive; |
| }); |
| } |
| |
| void summarize(String input) { |
| _processEventsFromFile(input); |
| _findTopExclusive(); |
| _findTopInclusive(); |
| _print(); |
| } |
| |
| String _pad(String input, int minLength) { |
| int length = input.length; |
| for (int i = 0; i < minLength - length; i++) { |
| input = ' $input'; |
| } |
| return input; |
| } |
| |
| static const TICKS_LENGTH = 10; |
| static const PERCENT_LENGTH = 7; |
| |
| void _printSymbol(int t, String name) { |
| String ticks = t.toString(); |
| ticks = _pad(ticks, TICKS_LENGTH); |
| double total = (t / _totalSamples); |
| String percent = (total * 100.0).toStringAsFixed(2); |
| percent = _pad(percent, PERCENT_LENGTH); |
| print('$ticks $percent $name'); |
| } |
| |
| void _print() { |
| print('Top ${numSymbols} inclusive symbols'); |
| print('--------------------------'); |
| print(' ticks percent name'); |
| _topInclusive.getRange(0, numSymbols).forEach((a) { |
| _printSymbol(a.inclusive, a.name); |
| }); |
| print(''); |
| print('Top ${numSymbols} exclusive symbols'); |
| print('--------------------------'); |
| print(' ticks percent name'); |
| _topExclusive.getRange(0, numSymbols).forEach((a) { |
| _printSymbol(a.exclusive, a.name); |
| }); |
| } |
| } |
| |
| main(List<String> arguments) { |
| if (arguments.length < 1) { |
| print('${Platform.executable} ${Platform.script} <input> [symbol count]'); |
| return; |
| } |
| String input = arguments[0]; |
| int numSymbols = 10; |
| if (arguments.length >= 2) { |
| numSymbols = int.parse(arguments[1]); |
| } |
| TraceSummary ts = new TraceSummary(numSymbols); |
| ts.summarize(input); |
| } |