Merge default into minor

--HG--
branch : minor

src/modules/physics/box2d/Fixture.cpp

@@ -43,11 +43,11 @@ Fixture::Fixture(Body *body, Shape *shape, float density)
 	: body(body)
 	, fixture(nullptr)
 {
-	data = new fixtureudata();
-	data->ref = nullptr;
+	udata = new fixtureudata();
+	udata->ref = nullptr;
 	b2FixtureDef def;
 	def.shape = shape->shape;
-	def.userData = (void *)data;
+	def.userData = (void *)udata;
 	def.density = density;
 	fixture = body->body->CreateFixture(&def);
 	this->retain();
@@ -57,7 +57,7 @@ Fixture::Fixture(Body *body, Shape *shape, float density)
 Fixture::Fixture(b2Fixture *f)
 	: fixture(f)
 {
-	data = (fixtureudata *)f->GetUserData();
+	udata = (fixtureudata *)f->GetUserData();
 	body = (Body *)Memoizer::find(f->GetBody());
 	if (!body)
 		body = new Body(f->GetBody());
@@ -67,10 +67,13 @@ Fixture::Fixture(b2Fixture *f)
 
 Fixture::~Fixture()
 {
-	if (data != nullptr)
-		delete data->ref;
+	if (!udata)
+		return;
 
-	delete data;
+	if (udata->ref)
+		delete udata->ref;
+
+	delete udata;
 }
 
 Shape::Type Fixture::getType() const
@@ -241,16 +244,24 @@ int Fixture::setUserData(lua_State *L)
 {
 	love::luax_assert_argc(L, 1, 1);
 
-	delete data->ref;
-	data->ref = new Reference(L);
+	if (udata == nullptr)
+	{
+		udata = new fixtureudata();
+		fixture->SetUserData((void *) udata);
+	}
+
+	if(!udata->ref)
+		udata->ref = new Reference();
+
+	udata->ref->ref(L);
 
 	return 0;
 }
 
 int Fixture::getUserData(lua_State *L)
 {
-	if (data->ref != nullptr)
-		data->ref->push(L);
+	if (udata->ref != nullptr)
+		udata->ref->push(L);
 	else
 		lua_pushnil(L);
 
@@ -323,6 +334,10 @@ void Fixture::destroy(bool implicit)
 	Memoizer::remove(fixture);
 	fixture = nullptr;
 
+	// Remove userdata reference to avoid it sticking around after GC
+	if (udata && udata->ref)
+		udata->ref->unref();
+
 	// Box2D fixture destroyed. Release its reference to the love Fixture.
 	this->release();
 }