在MFC中创建新上下文时发生崩溃

Question

V8版本：10.5.0

IDE：VS2022

我试图将V8嵌入MFC。简单地测试，我创建了一个对话框项目，在onInitDialog（）上初始化V8，将其处置为ondestroy（）。然后，我编写了代码以在bn_clicked事件中创建上下文并运行脚本（“ Hello World！）”。因此，按下按钮时，我想显示“ Hello World！”。但是崩溃发生在创建上下文的代码中（v8 :: local＆lt; v8 :: context＆gt; context＆gtoction = v8 :: context :: new（ky ke new（xyalle，nullptr）;）。

由于测试，这仅发生在MFC中。这种崩溃不会在控制台程序中发生。

有人，任何人帮助我〜。下面有我的整个代码。

cpp

BOOL Cv8TestDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    ...

    // Initialize V8.
    v8::V8::InitializeICUDefaultLocation("");
    v8::V8::InitializeExternalStartupData("");
    std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform();
    v8::V8::InitializePlatform(platform.get());
    v8::V8::Initialize();

    // Create a new Isolate and make it the current one.

    m_create_params.array_buffer_allocator = v8::ArrayBuffer::Allocator::NewDefaultAllocator();
    m_isolate = v8::Isolate::New(m_create_params);

    return TRUE;
}

void Cv8TestDlg::OnDestroy()
{
    CDialogEx::OnDestroy();

    m_isolate->Dispose();
    v8::V8::Dispose();
    v8::V8::DisposePlatform();
    delete m_create_params.array_buffer_allocator;
}

void Cv8TestDlg::OnRun()
{
    CString text;
    v8::Isolate* isolate = m_isolate;

    v8::Isolate::Scope isolate_scope(isolate);

    // Create a stack-allocated handle scope.
    v8::HandleScope handle_scope(isolate);

    // Create a new context.
    v8::Local<v8::Context> context = v8::Context::New(isolate, nullptr);

    // Enter the context for compiling and running the hello world script.
    v8::Context::Scope context_scope(context);
    {
        // Create a string containing the JavaScript source code.
        v8::Local<v8::String> source = v8::String::NewFromUtf8Literal(isolate, "'Hello' + ', World!'");

        // Compile the source code.
        v8::Local<v8::Script> script = v8::Script::Compile(context, source).ToLocalChecked();

        // Run the script to get the result.
        v8::Local<v8::Value> result = script->Run(context).ToLocalChecked();

        // Convert the result to an UTF8 string and print it.
        v8::String::Value utf8(isolate, result);
        text = (LPCWSTR)*utf8;
    }

    GetDlgItem(IDC_EDIT1)->SetWindowText(text);
}

h

class Cv8TestDlg : public CDialogEx
{
    ...

    v8::Isolate::CreateParams m_create_params;
    v8::Isolate* m_isolate = nullptr;

    virtual BOOL OnInitDialog();

    ...

    afx_msg void OnDestroy();
    afx_msg void OnRun();
};

碰撞呼叫堆栈

v8.dll!v8::internal::tracing::TraceEventHelper::GetTracingController() 
v8.dll!v8::NewContext(v8::Isolate * external_isolate, v8::ExtensionConfiguration * extensions, v8::MaybeLocal<v8::ObjectTemplate> global_template, v8::MaybeLocal<v8::Value> global_object, unsigned __int64 context_snapshot_index, v8::DeserializeInternalFieldsCallback embedder_fields_deserializer, v8::MicrotaskQueue * microtask_queue) line 6391    C++
v8.dll!v8::Context::New(v8::Isolate * external_isolate, v8::ExtensionConfiguration * extensions, v8::MaybeLocal<v8::ObjectTemplate> global_template, v8::MaybeLocal<v8::Value> global_object, v8::DeserializeInternalFieldsCallback internal_fields_deserializer, v8::MicrotaskQueue * microtask_queue) line 6413   C++
v8Test.exe!Cv8TestDlg::OnRun() line 198 C++

异常消息

）：0xc0000005：0x00000000000000000088

（0x00007ffadbb43d53（v8.dll）， v8test.exe -event.cc）

v8::TracingController* TraceEventHelper::GetTracingController() {
->  return v8::internal::V8::GetCurrentPlatform()->GetTracingController();
}

Answer 1

我认为问题是std :: simolor_ptr＆lt; v8 :: Platform＆gt;平台在oninitdialog中。 std :: unique_ptr的目的是销毁指向指针范围范围范围时指出的事物（即在这种情况下，在函数的末尾）。 v8 ::平台应该是长寿的，直到v8 :: v8 :: disposeplatform（）呼叫。