v8 reinit cause crash

[neufeng]

Cocos Creator 2.4.2
ScriptEngine::init()
_isolate = v8::Isolate::New(_createParams);

after exit cocos, then enter cocos again, crash on above line。It seams some incorrect use of Allocator!!!

[sky068]

我也遇到这个问题了，原生app集成cocos，二次启动就这个错误，请问有解嘛？

[PatriceJiang]

v8::platform::NewDefaultPlatform().release();
v8::V8::InitializePlatform(_platform);


v8::V8::Dispose();
v8::V8::ShutdownPlatform();

不需要多次执行, 从 scriptEngine 中抽出来

[ljs19850321]

楼上正解，但是重新初始化有黑屏现象，你们有嘛？ @PatriceJiang

[yuhanle]

我们目前退出时没做释放，第二次进入直接获取之前的 v8 使用。没有遇到黑屏问题

[296230428]

楼上能给个 demo 看看吗

[wdx700]

不释放V8，会导致V8一直在后台运行，占用内存和线程资源
如果不是纯游戏的APP，应该释放V8
目前也遇到这个问题，还没找到解决办法

[yuhanle]

楼上能给个 demo 看看吗

不好意思，最近才看到这里的消息。我截了屏可以参考下 cc @wdx700

除此之外，v8 占用的内存不多

其中两个个文件的修改，按截屏顺序看

1. cocos/bindings/jswrapper/v8/ScriptEngine.cpp
2. cocos/bindings/jswrapper/v8/ScriptEngine.h

[wdx700]

楼上能给个 demo 看看吗

不好意思，最近才看到这里的消息。我截了屏可以参考下 cc @wdx700

除此之外，v8 占用的内存不多

其中两个个文件的修改，按截屏顺序看

1. cocos/bindings/jswrapper/v8/ScriptEngine.cpp
2. cocos/bindings/jswrapper/v8/ScriptEngine.h

我们是自己改了Cocos的代码，封装成View方式加载cocos动画，退出页面时改cocos代码释放掉v8 engine
然后再次进入，第二次Initialize v8 engine，之后就会遇到崩溃
art_sigsegv_fault 0x0000007c07a7c2e8
art::FaultManager::HandleFault(int, siginfo*, void*) 0x0000007c07a7c7fc
art::SignalChain::Handler(int, siginfo*, void*) 0x0000005619525e54
0x0000007e9e6668b0
v8::internal::wasm::WasmEngine::AddIsolate(v8::internal::Isolate*) 0x0000007b97ddc608
v8::internal::wasm::WasmEngine::AddIsolate(v8::internal::Isolate*) 0x0000007b97ddc608
v8::internal::Isolate::Init(v8::internal::ReadOnlyDeserializer*, v8::internal::StartupDeserializer*) 0x0000007b97b25b80
v8::internal::Isolate::InitWithSnapshot(v8::internal::ReadOnlyDeserializer*, v8::internal::StartupDeserializer*) 0x0000007b97b260b0
v8::internal::Snapshot::Initialize(v8::internal::Isolate*) 0x0000007b97dc07b4
v8::Isolate::Initialize(v8::Isolate*, v8::Isolate::CreateParams const&) 0x0000007b97aa1270
v8::Isolate::New(v8::Isolate::CreateParams const&) 0x0000007b97aa1370
se::ScriptEngine::init() ScriptEngine.cpp:412
se::ScriptEngine::start() ScriptEngine.cpp:588
Game::init() Game.cpp:59
(anonymous namespace)::createGame(ANativeWindow*) JniCocosActivity.cpp:57
(anonymous namespace)::preExecCmd(signed char) JniCocosActivity.cpp:87
(anonymous namespace)::glThreadEntry() JniCocosActivity.cpp:134
decltype(std::__ndk1::forward<void ()()>(fp)()) std::__ndk1::__invoke<void ()()>(void (&&)()) type_traits:4353
void std::__ndk1::__thread_execute<std::__ndk1::unique_ptr<std::__ndk1::__thread_struct, std::__ndk1::default_deletestd::__ndk1::__thread_struct >, void ()()>(std::__ndk1::tuple<std::__ndk1::unique_ptr<std::__ndk1::__thread_struct, std::__ndk1::default_deletestd::__ndk1::__thread_struct >, void ()()>&, std::__ndk1::__tuple_indices<>) thread:342
void std::__ndk1::__thread_proxy<std::__ndk1::tuple<std::__ndk1::unique_ptr<std::__ndk1::__thread_struct, std::__ndk1::default_deletestd::__ndk1::__thread_struct >, void ()()> >(void) thread:352
__pthread_start(void*) 0x0000007e997b4d50
__start_thread 0x0000007e9975528c

[yuhanle]

重复初始化是会有问题的，所以不建议重复初始化。可参考上面的截图，改造支持下 @wdx700

[zeinx920]

重复初始化是会有问题的，所以不建议重复初始化。可参考上面的截图，改造支持下 @wdx700

你好, 请问除了这里修改还需要改其他地方吗, 目前我们第二次进去还是会遇到黑屏的问题, 报错信息如下

2022-09-21 18:45:50.791 30276-30846/org.cocos2d.demo D/cocos2d-x: find in flash memory dirPath(/data/data/org.cocos2d.demo/files/temp)
2022-09-21 18:45:51.131 30276-30846/org.cocos2d.demo D/jswrapper: JS: Cocos Creator v2.4.9
2022-09-21 18:45:51.461 30276-30846/org.cocos2d.demo D/jswrapper: JS: InitScene: 4.0090000000000146ms
2022-09-21 18:45:51.461 30276-30846/org.cocos2d.demo D/jswrapper: JS: AttachPersist: 0.6080000000001746ms
2022-09-21 18:45:51.461 30276-30846/org.cocos2d.demo D/jswrapper: JS: AutoRelease: 0.875999999999749ms
2022-09-21 18:45:51.461 30276-30846/org.cocos2d.demo D/jswrapper: JS: Destroy: 0.06400000000030559ms
2022-09-21 18:45:51.811 30276-30846/org.cocos2d.demo D/jswrapper: JS: Activate: 343.56600000000026ms
2022-09-21 18:45:51.871 30276-30846/org.cocos2d.demo I/Adreno-ES20: <validate_vertex_attrib_state:61>: validate_vertex_attrib_state: No vertex attrib is enabled in a draw call!
2022-09-21 18:45:51.871 30276-30846/org.cocos2d.demo I/Adreno-ES20: <validate_vertex_attrib_state:61>: validate_vertex_attrib_state: No vertex attrib is enabled in a draw call!
2022-09-21 18:45:51.871 30276-30846/org.cocos2d.demo I/Adreno-ES20: <validate_vertex_attrib_state:61>: validate_vertex_attrib_state: No vertex attrib is enabled in a draw call!
2022-09-21 18:45:51.871 30276-30846/org.cocos2d.demo I/Adreno-ES20: <validate_vertex_attrib_state:61>: validate_vertex_attrib_state: No vertex attrib is enabled in a draw call!
2022-09-21 18:45:51.911 30276-30846/org.cocos2d.demo I/Adreno-ES20: <validate_vertex_attrib_state:61>: validate_vertex_attrib_state: No vertex attrib is enabled in a draw call!
2022-09-21 18:45:51.911 30276-30846/org.cocos2d.demo I/Adreno-ES20: <validate_vertex_attrib_state:61>: validate_vertex_attrib_state: No vertex attrib is enabled in a draw call!
2022-09-21 18:45:51.911 30276-30846/org.cocos2d.demo I/Adreno-ES20: <validate_vertex_attrib_state:61>: validate_vertex_attrib_state: No vertex attrib is enabled in a draw call!

[decwang]

在退出时释放下DeviceGraphics这个单例对象就可以修复iOS的黑屏问题.Android目前我们用的是新进程的方式规避的.