Hello, I'm working on a game engine that uses V8 JavaScript for scripting,
and I'm exposing a Sprite class to the JavaScript API, and I've run into a
problem: it isn't being garbage collected.
Here's how I'm wrapping the class:
v8::Persistent<v8::ObjectTemplate> _template;
// ...
v8::Handle<v8::ObjectTemplate> CreateTemplate() { v8::HandleScope
handle_scope; v8::Handle<v8::FunctionTemplate> templ =
v8::FunctionTemplate::New(); // ... set some methods ...
v8::Handle<v8::ObjectTemplate> t = templ->InstanceTemplate();
t->SetInternalFieldCount(1); return handle_scope.Close(t); } FUNC_TYPE
Wrap(FUNC_ARGS) { v8::HandleScope handle_scope; if (args.IsConstructCall())
{ v8::String::Utf8Value filename(args[0]); Video::Sprite* s = new
Video::Sprite(Scripting::ToCString(filename)); // Create the class template
if it doesn't exist yet if (_template.IsEmpty()) { _template =
v8::Persistent<v8::ObjectTemplate>::New(CreateTemplate()); }
v8::Persistent<v8::Object> result =
v8::Persistent<v8::Object>::New(_template->NewInstance());
result.MakeWeak(s, WeakRefCallback); result->SetInternalField(0,
v8::External::New(s)); return handle_scope.Close(result); } return
v8::Undefined(); } void WeakRefCallback(v8::Persistent<v8::Value> object,
void* parameter) { Video::Sprite* s =
static_cast<Video::Sprite*>(parameter); delete s; object.Dispose(); }
I'm testing the garbage collection by continually creating and deleting
sprites in the JavaScript. However the WeakRefCallback is never called, and
the memory usage continues to rise and rise. I've checked to make sure that
the GC is running (with v8::V8::AddGCEpilogueCallback) and it is, quite
frequently, however this is not disposing of the deleted JavaScript sprites.
Anyone have any ideas as to why?
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