I tried every possible method but cannot intercept setting members on a
Local<Function> instance. Also couldn't find any example in the
https://chromium.googlesource.com/v8/v8/+/refs/heads/lkgr/test/cctest/test-api-interceptors.cc
Is this simply not possible?
On Monday, March 2, 2020 at 11:32:50 AM UTC+2, Darin Dimitrov wrote:
>
> I managed to intercept the setting of the instance method with the
> following:
>
> myClassTemplate->PrototypeTemplate()->SetHandler(
> NamedPropertyHandlerConfiguration(nullptr, [](Local<Name> property, Local<
> Value> value, const PropertyCallbackInfo<Value>& info) {
> printf("This will be called when setting the instance method on the
> prototype");
> }));
>
>
> So the question remains only for the static method interception.
>
>
> On Monday, March 2, 2020 at 11:10:26 AM UTC+2, Darin Dimitrov wrote:
>>
>> I am embedding V8 in my application and registered a custom class
>> (MyClass). I am looking for a way to intercept the setting of methods on
>> this class.
>>
>> Here's my code:
>>
>>
>> auto platform = platform::NewDefaultPlatform();
>> V8::InitializePlatform(platform.get());
>> V8::Initialize();
>> std::string flags = "--expose_gc --jitless";
>> V8::SetFlagsFromString(flags.c_str(), flags.size());
>> Isolate::CreateParams create_params;
>> create_params.array_buffer_allocator = ArrayBuffer::Allocator::
>> NewDefaultAllocator();
>>
>> Isolate* isolate = Isolate::New(create_params);
>> {
>> Isolate::Scope isolate_scope(isolate);
>> HandleScope handle_scope(isolate);
>>
>> Local<FunctionTemplate> myClassTemplate = FunctionTemplate::New(
>> isolate);
>> Local<FunctionTemplate> myInstanceMethodTemplate = FunctionTemplate::
>> New(isolate);
>> myClassTemplate->InstanceTemplate()->Set(v8::String::NewFromUtf8(
>> isolate, "myInstanceMethod", v8::NewStringType::kNormal).ToLocalChecked
>> (), myInstanceMethodTemplate);
>>
>> Local<ObjectTemplate> globalTemplate = ObjectTemplate::New(isolate);
>> globalTemplate->Set(v8::String::NewFromUtf8(isolate, "MyClass", v8::
>> NewStringType::kNormal).ToLocalChecked(), myClassTemplate);
>>
>> Local<v8::Context> context = v8::Context::New(isolate, nullptr,
>> globalTemplate);
>> Context::Scope context_scope(context);
>> {
>> Local<v8::Function> myClassCtor = myClassTemplate->GetFunction(
>> context).ToLocalChecked();
>> Local<v8::Function> myStaticMethod = v8::Function::New(context,
>> nullptr).ToLocalChecked();
>> assert(myClassCtor->Set(context, v8::String::NewFromUtf8(isolate,
>> "myStaticMethod", v8::NewStringType::kNormal).ToLocalChecked(),
>> myStaticMethod).FromMaybe(false));
>>
>> std::string src = R"(
>> // I want to intercept setting this static method and raise
>> some C++ callback when this code is executed
>> MyClass.myStaticMethod = () => { };
>>
>> // I want to intercept setting this instance method and raise
>> some C++ callback when this code is executed
>> MyClass.prototype.myInstanceMethod = () => { };
>> )";
>>
>> Local<v8::String> source = v8::String::NewFromUtf8(isolate, src.
>> c_str(), v8::NewStringType::kNormal).ToLocalChecked();
>> Local<Script> script = Script::Compile(context, source).
>> ToLocalChecked();
>> Local<Value> result = script->Run(context).ToLocalChecked();
>> assert(!result.IsEmpty());
>> }
>>
>> }
>>
>> isolate->Dispose();
>> V8::Dispose();
>> V8::ShutdownPlatform();
>> delete create_params.array_buffer_allocator;
>>
>>
>>
>> In this code I need a C++ callback to be raised when the script is trying
>> to replace some existing static or instance method on my custom class.
>>
>> Is there some API in V8 that I can use to achieve that?
>>
>> I have tried registering a NamedPropertyHandlerConfiguration but my
>> callback is never called:
>>
>> myClassTemplate->InstanceTemplate()->SetHandler(
>> NamedPropertyHandlerConfiguration(nullptr, [](Local<Name> property, Local
>> <Value> value, const PropertyCallbackInfo<Value>& info) {
>> printf("ok");
>> }));
>>
>>
>> Basically I need a way to detect that some script is trying to replace
>> the methods which I have registered manually.
>>
>
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