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| 1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 /// This tool gives a breakdown of code size by deferred part in the program. |
| 6 library dart2js_info.bin.deferred_library_size; |
| 7 |
| 8 import 'dart:math'; |
| 9 |
| 10 import 'package:dart2js_info/info.dart'; |
| 11 import 'package:dart2js_info/src/util.dart'; |
| 12 |
| 13 main(args) async { |
| 14 // TODO(het): Would be faster to only parse the 'outputUnits' part |
| 15 var info = await infoFromFile(args.first); |
| 16 var sizeByImport = getSizeByImport(info); |
| 17 printSizes(sizeByImport, info.program.size); |
| 18 } |
| 19 |
| 20 class ImportSize { |
| 21 final String import; |
| 22 final int size; |
| 23 |
| 24 const ImportSize(this.import, this.size); |
| 25 |
| 26 String toString() { |
| 27 return '$import: $size'; |
| 28 } |
| 29 } |
| 30 |
| 31 void printSizes(Map<String, int> sizeByImport, int programSize) { |
| 32 var importSizes = <ImportSize>[]; |
| 33 sizeByImport.forEach((import, size) { |
| 34 importSizes.add(new ImportSize(import, size)); |
| 35 }); |
| 36 // Sort by size, largest first. |
| 37 importSizes.sort((a, b) => b.size - a.size); |
| 38 var longest = importSizes.fold('Percent of code deferred'.length, |
| 39 (longest, importSize) => max(longest, importSize.import.length)); |
| 40 |
| 41 _printRow(label, data, {int width: 15}) { |
| 42 print('${label.toString().padRight(longest + 1)}' |
| 43 '${data.toString().padLeft(width)}'); |
| 44 } |
| 45 |
| 46 print(''); |
| 47 print('Size by library'); |
| 48 print('-' * (longest + 16)); |
| 49 for (var importSize in importSizes) { |
| 50 // TODO(het): split into specific and shared size |
| 51 _printRow(importSize.import, importSize.size); |
| 52 } |
| 53 print('-' * (longest + 16)); |
| 54 |
| 55 var mainChunkSize = sizeByImport['main']; |
| 56 var deferredSize = programSize - mainChunkSize; |
| 57 var percentDeferred = (deferredSize * 100 / programSize).toStringAsFixed(2); |
| 58 _printRow('Main chunk size', mainChunkSize); |
| 59 _printRow('Deferred code size', deferredSize); |
| 60 _printRow('Percent of code deferred', '$percentDeferred%'); |
| 61 } |
| 62 |
| 63 Map<String, int> getSizeByImport(AllInfo info) { |
| 64 var sizeByImport = <String, int>{}; |
| 65 for (var outputUnit in info.outputUnits) { |
| 66 if (outputUnit.name == 'main' || outputUnit.name == null) { |
| 67 sizeByImport['main'] = outputUnit.size; |
| 68 } else { |
| 69 for (var import in outputUnit.imports) { |
| 70 sizeByImport.putIfAbsent(import, () => 0); |
| 71 sizeByImport[import] += outputUnit.size; |
| 72 } |
| 73 } |
| 74 } |
| 75 return sizeByImport; |
| 76 } |
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