v8 FunctionTemplate::GetFunction() crashes with Access Violation

Question

I have a really simple method that initializes v8, I am unable to track the reason (other v8 stuff works just fine):

void JavascriptEngine::init() {
    m_platform = v8::platform::NewDefaultPlatform();

    v8::V8::InitializeExternalStartupData(".");

    v8::V8::InitializeICU();
    v8::V8::InitializePlatform(&*m_platform);
    v8::V8::Initialize();

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

    v8::Isolate::Scope isolate_scope(m_isolate);
    v8::HandleScope handle_scope(m_isolate);

    m_context = make_unique<v8::Persistent<v8::Context>>(m_isolate, 
        create_new_context());

    v8::Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New(m_isolate);
    t->SetClassName(v8::String::NewFromUtf8(m_isolate, "Test", v8::NewStringType::kNormal).ToLocalChecked());
    t->Set(m_isolate, "func_property", v8::Number::New(m_isolate, 1));

    auto f = t->GetFunction(); // CRASH

    ...//rest of the code
}

Error I got:

Exception thrown: read access violation.
**this** was nullptr.

Using Visual Studio 2017. What am I missing?

Answer 1

To GetFunction you need to have Context and enter it. Depends on what v8 version you use, there are methods which require Isolate and Context be passed explicitly. In general, this is what v8 internally moves to - to pass Isolate and Context to methods that require that (there couldb some inconsistency, though).