google v8持久上下文-脚本编译崩溃

Question

我正在尝试使用一个全局上下文进行以后的执行。调用function1时，脚本返回正确的值。但是，当我在那之后调用function2时，Script :: Compile崩溃。函数1是v8的初始化，因此我只调用它一次。

全局变量：

    Isolate *isolate;
    Persistent<Context> pContext;

function1的代码：

    auto platform = platform::NewDefaultPlatform();
    V8::InitializePlatform(platform.get());
    V8::Initialize();

    Isolate::CreateParams create_params;
    create_params.array_buffer_allocator = ArrayBuffer::Allocator::NewDefaultAllocator();
    isolate = Isolate::New(create_params);

    Locker locker(isolate);

    Isolate::Scope isolate_scope(isolate);
    HandleScope handle_scope(isolate);

    Local<Context> context = Context::New(isolate);
    pContext.Reset(isolate, context);

    Context::Scope context_scope(context);

    Local<Script> script = Script::Compile(context, to_v8(isolate, "'Test'")).ToLocalChecked();

    Local<Value> r = script->Run(context).ToLocalChecked();

    cout << "script result: " << *(String::Utf8Value(isolate, r));

function2：

Isolate::Scope isolate_scope(isolate);
HandleScope handle_scope(isolate);

Local<Context> context = Local<Context>::New(isolate, pContext);

Local<Script> script = Script::Compile(context, to_v8(isolate, "'Test'")).ToLocalChecked();

Context::Scope context_scope(context);
Local<Value> r = script->Run(context).ToLocalChecked();

cout << "script result: " << *(String::Utf8Value(isolate, r));

我得到的Stacktrace：

at v8::internal::Compiler::GetSharedFunctionInfoForScript[v8::internal::Isolate*, v8::internal::Handle<v8::internal::String>, v8::internal::Compiler::ScriptDetails const&, v8::ScriptOriginOptions, v8::Extension*, v8::internal::ScriptData*, v8::ScriptCompiler::CompileOptions, v8::ScriptCompiler::NoCacheReason, v8::internal::NativesFlag] (UnknownFile:?)
at v8::ScriptCompiler::CompileUnboundInternal[v8::Isolate*, v8::ScriptCompiler::Source*, v8::ScriptCompiler::CompileOptions, v8::ScriptCompiler::NoCacheReason] (UnknownFile:?)
at v8::ScriptCompiler::Compile[v8::Local<v8::Context>, v8::ScriptCompiler::Source*, v8::ScriptCompiler::CompileOptions, v8::ScriptCompiler::NoCacheReason] (UnknownFile:?)
at v8::Script::Compile[v8::Local<v8::Context>, v8::Local<v8::String>, v8::ScriptOrigin*] (UnknownFile:?)

to_v8是v8 :: String :: NewFromUtf8（）的函数

Answer 1

看起来像是与Embedded V8 context and script compilation crash相同的问题：v8::platform::NewDefaultPlatform返回std::unique_ptr（由于使用了auto而没有看到），因此当它超出范围时会被销毁。将其设置为全局变量，然后一切正常。

注1：如果您编译了Debug版本并使用了Debugger，则可以自己解决此类问题，与不得不在某个地方发布问题然后等待某人获得答案相比，这可以节省很多时间。来回答它。

注2：注意auto。类型是有意义的。如这个问题所示，看到它们（通过将它们拼写出来）有助于避免错误。