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张梦 371476bf84 Fix dartvm re-init Flag check crash 
Fix dartvm re-init Flag check crash,if dartvm first init set FLAG_causal_async_stacks and FLAG_lazy_async_stacks both true, when we re-init dart vm we will get a crash,it's better to read flag before flag check.

I got this crash when we modified flutter engine [common/settings.h](https://github.com/flutter/engine/blob/master/common/settings.h), because we want to destory dartvm to release memory，but when we recreate the Flutter engine ,we got crash below
```dart
 [VERBOSE-3:dart_vm.cc(421)] Error while initializing the Dart VM: To use --lazy-async-stacks, please disable --causal-async-stacks!
```
So I changed the code order, First to initialize flag from snopshot,then we check the Flag  is legal or not

Closes https://github.com/dart-lang/sdk/pull/43312
https://github.com/dart-lang/sdk/pull/43312

GitOrigin-RevId: d8b05f613751a3516c864a526d5976f570d589d5
Change-Id: I4cb73df93000333963bd68da3d5dae96e382a2e1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/161720
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
2020-09-11 16:29:52 +00:00
.dart_tool [vm/wasm] Wasm module instantiation and function calling 2020-09-02 00:22:21 +00:00
.github Update new issue template. 2019-04-30 18:14:21 +00:00
benchmarks [benchmarks] Adding benchmarks for dynamic closure calls. 2020-08-28 14:49:18 +00:00
build Reland "[vm/wasm] Boilerplate for package:wasm" 2020-08-21 18:23:00 +00:00
client
docs process docs: Add link to experimental flags yaml file 2020-05-30 02:28:22 +00:00
pkg [cfe] Implement addHashCode to valueClass transformation 2020-09-11 16:05:52 +00:00
runtime Fix dartvm re-init Flag check crash 2020-09-11 16:29:52 +00:00
samples Revert "[samples/ffi] Generate sqlite3 bindings with package:ffigen" 2020-08-11 19:38:18 +00:00
samples-dev/swarm [cfe] Check overrides on operators 2020-07-08 08:45:34 +00:00
sdk [dart2js] Fix global type analysis 2020-09-11 04:07:41 +00:00
tests Change resolution of assignment to PropertyAccess. 2020-09-11 15:50:20 +00:00
third_party Reland "[vm/wasm] Boilerplate for package:wasm" 2020-08-21 18:23:00 +00:00
tools Bump dartdoc to ab98003fc368f484fcc4c055770adea47bc83fbd 2020-09-10 02:20:30 +00:00
utils add --strong-null-safety flag to the kernel worker 2020-08-19 18:57:47 +00:00
.clang-format
.gitattributes Migrate language_2/string to null safety. 2020-06-17 21:14:43 +00:00
.gitconfig
.gitignore [vm/ffi] Cleanup old documentation references 2020-09-10 10:18:55 +00:00
.gn
.mailmap fix my name in .mailmap 2018-09-11 01:45:52 +00:00
.packages Reland "[vm/wasm] Boilerplate for package:wasm" 2020-08-21 18:23:00 +00:00
.style.yapf Mass format python with yapf 2019-08-05 20:34:31 +00:00
.vpython [infra] Add .vpython spec to fix gsutil on the bots (#31065) 2018-10-11 15:11:35 +00:00
AUTHORS [runtime/vm] ARM64: Support unaligned memory accesses for regex. 2019-10-15 20:11:40 +00:00
BUILD.gn Reland "[vm] Fix some Fuchsia tests" 2020-08-06 21:29:29 +00:00
CHANGELOG.md Revert "Enable long path on Windows" 2020-09-08 22:34:50 +00:00
codereview.settings
CONTRIBUTING.md Fix a number of outdated URLs across a number of markdown files 2020-05-29 09:23:45 +00:00
DEPS [co19] Roll co19 to b82516f08b02a10f5a65b7157e8cfdf00f10bdf4 2020-09-10 13:20:08 +00:00
LICENSE Remove third_party licenses from LICENSE 2019-08-21 07:43:34 +00:00
PATENT_GRANT Rename patent file 2019-08-16 12:03:17 +00:00
PRESUBMIT.py [Core Libraries] Eliminate the fork in the core libraries. 2020-06-16 23:37:36 +00:00
README.dart-sdk Add dart2native to sdk README 2020-01-20 09:32:58 +00:00
README.md Fix typo in README.md 2020-08-10 20:56:14 +00:00
sdk_args.gni [build] Automatically rebuild sdk_hash when the Git commit changes. 2020-07-09 21:12:15 +00:00
WATCHLISTS [dart2js] 20 dart2js tests ported to nnbd #1. 2020-06-26 15:21:42 +00:00

README.md

Dart

A client-optimized language for fast apps on any platform

Dart is:

  • Optimized for UI: Develop with a programming language specialized around the needs of user interface creation

  • Productive: Make changes iteratively: use hot reload to see the result instantly in your running app

  • Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web

Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:

  • Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.

  • Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).

Dart platforms illustration

License & patents

Dart is free and open source.

See LICENSE and PATENT_GRANT.

Using Dart

Visit dart.dev to learn more about the language, tools, getting started, and more.

Browse pub.dev for more packages and libraries contributed by the community and the Dart team.

Building Dart

If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.

There are more documents on our wiki.

Contributing to Dart

The easiest way to contribute to Dart is to file issues.

You can also contribute patches, as described in Contributing.