flutter engine framework断点调试

编译framework

https://github.com/flutter/engine/blob/master/CONTRIBUTING.md

编译release

debug

ninja -C out/ios_debug_unopt && ninja -C out/host_debug_unopt

release

$ ninja -C out/ios_release_unopt && ninja -C out/host_release_unopt 

指定engine版本运行 flutter run

$../../bin/flutter run --local-engine-src-path /Users/boo/Documents/engine/engine/src/out/ios_debug  --local-engine=ios_debug_unopt

$  flutter run --local-engine-src-path /Users/boo/Documents/engine/engine/src  --local-engine=ios_debug_unopt

flutter packages get --local-engine-src-path /Users/boo/Documents/engine/engine/src  --local-engine=ios_debug_sim_unopt -d XXXX

//运行flutter
$ flutter run --local-engine-src-path /Users/boo/Documents/engine/engine/src  --local-engine=ios_debug_sim_unopt -d XXXX

修改完源代码添加runscript

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cd /Users/boo/Documents/engine/engine/src

ninja -C out/ios_debug_unopt && ninja -C out/host_debug_unopt

cp -rf /Users/boo/Documents/engine/engine/src/out/ios_debug_unopt/Flutter.framework  /Users/boo/Documents/demo/flutterbeta/flutterOnExistApp_SelfEngine/Flutter/engine

作用是重新编译framework使其生效
注意这里的debug，release，或模拟器目录要设正确，否则编译不过，下次生效

打开

设置xcode断点

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initWithFlutterAssets:dartMain:packages:

hellobooob

修改资源加载路径

https://github.com/flutter/engine/blob/f4aadb11cf132c13c16c8f8011680d3f9cc7d505/shell/platform/darwin/ios/framework/Source/FlutterDartProject.mm

修复循环引用

image.png image.png

常见错误

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Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_FlutterAppDelegate", referenced from:
      _OBJC_CLASS_$_AppDelegate in AppDelegate.o
  "_OBJC_CLASS_$_FlutterMethodChannel", referenced from:
      objc-class-ref in libpackage_info.a(PackageInfoPlugin.o)
  "_OBJC_METACLASS_$_FlutterAppDelegate", referenced from:
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
  "_FlutterMethodNotImplemented", referenced from:
      -[FLTPackageInfoPlugin handleMethodCall:result:] in libpackage_info.a(PackageInfoPlugin.o)
  "_OBJC_CLASS_$_FlutterViewController", referenced from:
      objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

flutter.framework编译版本问题，需要重新编译或使用旧的替换先

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[VERBOSE-1:callback_cache.cc(132)] Could not parse callback cache, aborting restore
2018-10-18 16:47:21.434650+0800 flutterOnExistApp[33371:13930425] [VERBOSE-2:shell.cc(181)] Dart Error: Can't load Kernel binary: Invalid kernel binary format version.
2018-10-18 16:47:21.434875+0800 flutterOnExistApp[33371:13930425] [VERBOSE-2:engine.cc(157)] Could not prepare to run the isolate.
2018-10-18 16:47:21.435723+0800 flutterOnExistApp[33371:13930425] [VERBOSE-2:engine.cc(116)] Engine not prepare and launch isolate.
2018-10-18 16:47:21.436000+0800 flutterOnExistApp[33371:13930425] [VERBOSE-2:FlutterViewController.mm(462)] Could not launch engine with configuration.
2018-10-18 16:47:21.554817+0800 flutterOnExistApp[33371:13930431] flutter: Observatory listening on http://127.0.0.1:54038/

还是flutter.framework 编译版本问
题

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出现错误
You must specify --local-engine if you are using a locally built engine.

image.png

提示出错了，engin少了一个e 应该是engine

$ flutter packages get --local-engine=ios_debug_unopt

$ flutter run  --local-engine=ios_debug_unopt

---

问题

image.png

Unable to detect local Flutter engine build directory.
Either specify a dependency_override for the sky_engine package in your pubspec.yaml and
ensure --package-root is set if necessary, or set the $FLUTTER_ENGINE environment variable, or
use --local-engine-src-path to specify the path to the root of your flutter/engine repository.
Failed to package /Users/boo/Documents/demo/flutterbeta/flutterOnExistApp_SelfEngine/myflutter.
Command /bin/sh failed with exit code 255

重新执行

pod update

其他不通过情况再尝试使用

flutter packages get

flutter run

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问题：

2018-10-18 21:24:03.474221+0800 flutterOnExistApp[54577:15146469] [VERBOSE-2:shell.cc(182)] Dart Error: Can't load Kernel binary: Invalid kernel binary format version.
2018-10-18 21:24:03.474442+0800 flutterOnExistApp[54577:15146469] [VERBOSE-2:engine.cc(174)] Could not prepare to run the isolate.
2018-10-18 21:24:03.474760+0800 flutterOnExistApp[54577:15146469] [VERBOSE-2:engine.cc(121)] Engine not prepare and launch isolate.
2018-10-18 21:24:03.475266+0800 flutterOnExistApp[54577:15146469] [VERBOSE-2:FlutterViewController.mm(486)] Could not launch engine with configuration.
2018-10-18 21:24:03.522773+0800 flutterOnExistApp[54577:15146476] flutter: Observatory listening on http://127.0.0.1:56060/

flutter 和 engine版本不一致

需要更新到一致状态
使用命令

flutter upgrade

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