stackframe这个类是在stack_frame.dart这个文件里的，主要是解析报错信息的，就如下展示的报错信息：
#0 getSampleStack. (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:40:57)
#1 new Future.sync (dart:async/future.dart:224:31)
#2 getSampleStack (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:40:10)
#3 main (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:46:40)
#4 main (package:flutter_goldens/flutter_goldens.dart:43:17)
#5 main.. (file:///temp/path.whatever/listener.dart:47:18)
#6 _rootRun (dart:async/zone.dart:1126:13)
#7 _CustomZone.run (dart:async/zone.dart:1023:19)
#8 _runZoned (dart:async/zone.dart:1518:10)
#9 runZoned (dart:async/zone.dart:1465:12)
#10 Declarer.declare (package:test_api/src/backend/declarer.dart:130:22)
#11 RemoteListener.start... (package:test_api/src/remote_listener.dart:124:26)
#12 _rootRun (dart:async/zone.dart:1126:13)
#13 _CustomZone.run (dart:async/zone.dart:1023:19)
#14 _runZoned (dart:async/zone.dart:1518:10)
#15 runZoned (dart:async/zone.dart:1502:12)
#16 RemoteListener.start.. (package:test_api/src/remote_listener.dart:70:9)
#17 _rootRun (dart:async/zone.dart:1126:13)
#18 _CustomZone.run (dart:async/zone.dart:1023:19)
#19 _runZoned (dart:async/zone.dart:1518:10)
#20 runZoned (dart:async/zone.dart:1465:12)
#21 StackTraceFormatter.asCurrent (package:test_api/src/backend/stack_trace_formatter.dart:41:31)
#22 RemoteListener.start. (package:test_api/src/remote_listener.dart:69:29)
#23 _rootRun (dart:async/zone.dart:1126:13)
#24 _CustomZone.run (dart:async/zone.dart:1023:19)
#25 _runZoned (dart:async/zone.dart:1518:10)
#26 runZoned (dart:async/zone.dart:1465:12)
#27 SuiteChannelManager.asCurrent (package:test_api/src/suite_channel_manager.dart:34:31)
#28 RemoteListener.start (package:test_api/src/remote_listener.dart:68:27)
#29 serializeSuite (file:///temp/path.whatever/listener.dart:17:25)
#30 main (file:///temp/path.whatever/listener.dart:43:36)
#31 _runMainZoned.. (dart:ui/hooks.dart:239:25)
#32 _rootRun (dart:async/zone.dart:1126:13)
#33 _CustomZone.run (dart:async/zone.dart:1023:19)
#34 _runZoned (dart:async/zone.dart:1518:10)
#35 runZoned (dart:async/zone.dart:1502:12)
#36 _runMainZoned. (dart:ui/hooks.dart:231:5)
#37 _startIsolate. (dart:isolate-patch/isolate_patch.dart:307:19)
#38 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)
是不是觉得很在console里常常看到这个？这个类就是解析这一部分信息的, 输出的结果就是如下图所示：
StackFrame(number: 0, className: '', method: 'getSampleStack', packageScheme: 'file', package: '', packagePath: '/path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart', line: 40, column: 57, source: '#0 getSampleStack. (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:40:57)'),
StackFrame(number: 1, className: 'Future', method: 'sync', packageScheme: 'dart', package: 'async', packagePath: 'future.dart', line: 224, column: 31, isConstructor: true, source: '#1 new Future.sync (dart:async/future.dart:224:31)'),
StackFrame(number: 2, className: '', method: 'getSampleStack', packageScheme: 'file', package: '', packagePath: '/path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart', line: 40, column: 10, source: '#2 getSampleStack (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:40:10)'),
StackFrame(number: 3, className: '', method: 'main', packageScheme: 'file', package: '', packagePath: '/path/to/flutter/packages/flutter/foundation/error_reporting_test.dart', line: 46, column: 40, source: '#3 main (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:46:40)'),
StackFrame(number: 4, className: '', method: 'main', packageScheme: 'package', package: 'flutter_goldens', packagePath: 'flutter_goldens.dart', line: 43, column: 17, source: '#4 main (package:flutter_goldens/flutter_goldens.dart:43:17)'),
StackFrame.asynchronousSuspension,
StackFrame(number: 5, className: '', method: 'main', packageScheme: 'file', package: '', packagePath: '/temp/path.whatever/listener.dart', line: 47, column: 18, source: '#5 main.. (file:///temp/path.whatever/listener.dart:47:18)'),
StackFrame(number: 6, className: '', method: '_rootRun', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1126, column: 13, source: '#6 _rootRun (dart:async/zone.dart:1126:13)'),
StackFrame(number: 7, className: '_CustomZone', method: 'run', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1023, column: 19, source: '#7 _CustomZone.run (dart:async/zone.dart:1023:19)'),
StackFrame(number: 8, className: '', method: '_runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1518, column: 10, source: '#8 _runZoned (dart:async/zone.dart:1518:10)'),
StackFrame(number: 9, className: '', method: 'runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1465, column: 12, source: '#9 runZoned (dart:async/zone.dart:1465:12)'),
StackFrame(number: 10, className: 'Declarer', method: 'declare', packageScheme: 'package', package: 'test_api', packagePath: 'src/backend/declarer.dart', line: 130, column: 22, source: '#10 Declarer.declare (package:test_api/src/backend/declarer.dart:130:22)'),
StackFrame(number: 11, className: 'RemoteListener', method: 'start', packageScheme: 'package', package: 'test_api', packagePath: 'src/remote_listener.dart', line: 124, column: 26, source: '#11 RemoteListener.start... (package:test_api/src/remote_listener.dart:124:26)'),
StackFrame.asynchronousSuspension,
StackFrame(number: 12, className: '', method: '_rootRun', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1126, column: 13, source: '#12 _rootRun (dart:async/zone.dart:1126:13)'),
StackFrame(number: 13, className: '_CustomZone', method: 'run' , packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1023, column: 19, source: '#13 _CustomZone.run (dart:async/zone.dart:1023:19)'),
StackFrame(number: 14, className: '', method: '_runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1518, column: 10, source: '#14 _runZoned (dart:async/zone.dart:1518:10)'),
StackFrame(number: 15, className: '', method: 'runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1502, column: 12, source: '#15 runZoned (dart:async/zone.dart:1502:12)'),
StackFrame(number: 16, className: 'RemoteListener', method: 'start', packageScheme: 'package', package: 'test_api', packagePath: 'src/remote_listener.dart', line: 70, column: 9, source: '#16 RemoteListener.start.. (package:test_api/src/remote_listener.dart:70:9)'),
StackFrame(number: 17, className: '', method: '_rootRun', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1126, column: 13, source: '#17 _rootRun (dart:async/zone.dart:1126:13)'),
StackFrame(number: 18, className: '_CustomZone', method: 'run', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1023, column: 19, source: '#18 _CustomZone.run (dart:async/zone.dart:1023:19)'),
StackFrame(number: 19, className: '', method: '_runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1518, column: 10, source: '#19 _runZoned (dart:async/zone.dart:1518:10)'),
StackFrame(number: 20, className: '', method: 'runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1465, column: 12, source: '#20 runZoned (dart:async/zone.dart:1465:12)'),
StackFrame(number: 21, className: 'StackTraceFormatter', method: 'asCurrent', packageScheme: 'package', package: 'test_api', packagePath: 'src/backend/stack_trace_formatter.dart', line: 41, column: 31, source: '#21 StackTraceFormatter.asCurrent (package:test_api/src/backend/stack_trace_formatter.dart:41:31)'),
StackFrame(number: 22, className: 'RemoteListener', method: 'start', packageScheme: 'package', package: 'test_api', packagePath: 'src/remote_listener.dart', line: 69, column: 29, source: '#22 RemoteListener.start. (package:test_api/src/remote_listener.dart:69:29)'),
StackFrame(number: 23, className: '', method: '_rootRun', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1126, column: 13, source: '#23 _rootRun (dart:async/zone.dart:1126:13)'),
StackFrame(number: 24, className: '_CustomZone', method: 'run', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1023, column: 19, source: '#24 _CustomZone.run (dart:async/zone.dart:1023:19)'),
StackFrame(number: 25, className: '', method: '_runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1518, column: 10, source: '#25 _runZoned (dart:async/zone.dart:1518:10)'),
StackFrame(number: 26, className: '', method: 'runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1465, column: 12, source: '#26 runZoned (dart:async/zone.dart:1465:12)'),
StackFrame(number: 27, className: 'SuiteChannelManager', method: 'asCurrent', packageScheme: 'package', package: 'test_api', packagePath: 'src/suite_channel_manager.dart', line: 34, column: 31, source: '#27 SuiteChannelManager.asCurrent (package:test_api/src/suite_channel_manager.dart:34:31)'),
StackFrame(number: 28, className: 'RemoteListener', method: 'start', packageScheme: 'package', package: 'test_api', packagePath: 'src/remote_listener.dart', line: 68, column: 27, source: '#28 RemoteListener.start (package:test_api/src/remote_listener.dart:68:27)'),
StackFrame(number: 29, className: '', method: 'serializeSuite', packageScheme: 'file', package: '', packagePath: '/temp/path.whatever/listener.dart', line: 17, column: 25, source: '#29 serializeSuite (file:///temp/path.whatever/listener.dart:17:25)'),
StackFrame(number: 30, className: '', method: 'main', packageScheme: 'file', package: '', packagePath: '/temp/path.whatever/listener.dart', line: 43, column: 36, source: '#30 main (file:///temp/path.whatever/listener.dart:43:36)'),
StackFrame(number: 31, className: '', method: '_runMainZoned', packageScheme: 'dart', package: 'ui', packagePath: 'hooks.dart', line:239, column: 25, source: '#31 _runMainZoned.. (dart:ui/hooks.dart:239:25)'),
StackFrame(number: 32, className: '', method: '_rootRun', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1126, column: 13, source: '#32 _rootRun (dart:async/zone.dart:1126:13)'),
StackFrame(number: 33, className: '_CustomZone', method: 'run' , packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1023, column: 19, source: '#33 _CustomZone.run (dart:async/zone.dart:1023:19)'),
StackFrame(number: 34, className: '', method: '_runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1518, column: 10, source: '#34 _runZoned (dart:async/zone.dart:1518:10)'),
StackFrame(number: 35, className: '', method: 'runZoned', packageScheme: 'dart', package: 'async', packagePath: 'zone.dart', line: 1502, column: 12, source: '#35 runZoned (dart:async/zone.dart:1502:12)'),
StackFrame(number: 36, className: '', method: '_runMainZoned', packageScheme: 'dart', package: 'ui', packagePath: 'hooks.dart', line: 231, column: 5, source: '#36 _runMainZoned. (dart:ui/hooks.dart:231:5)'),
StackFrame(number: 37, className: '', method: '_startIsolate', packageScheme: 'dart', package: 'isolate-patch', packagePath: 'isolate_patch.dart', line: 307, column: 19, source: '#37 _startIsolate. (dart:isolate-patch/isolate_patch.dart:307:19)'),
StackFrame(number: 38, className: '_RawReceivePortImpl', method: '_handleMessage', packageScheme: 'dart', package: 'isolate-patch', packagePath: 'isolate_patch.dart',
这个类内部逻辑很简单，就不做详细分析，而且对于我们实际开发的意义有限，做统计比较合适。
这是flutter框架源码分析的其中一篇，因能力有限，有诸多不足之处，还请斧正。