bool
WatchpointMap::triggerWatchpoint(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp)
{
Map::Ptr p = map.lookup(WatchKey(obj, id));
if (!p || p->value().held)
return true;
AutoEntryHolder holder(cx, map, p);
/* Copy the entry, since GC would invalidate p. */
JSWatchPointHandler handler = p->value().handler;
RootedObject closure(cx, p->value().closure);
/* Determine the property's old value. */
Value old;
old.setUndefined();
if (obj->isNative()) {
NativeObject* nobj = &obj->as<NativeObject>();
if (Shape* shape = nobj->lookup(cx, id)) {
if (shape->hasSlot())
old = nobj->getSlot(shape->slot());
}
}
// Read barrier to prevent an incorrectly gray closure from escaping the
// watchpoint. See the comment before UnmarkGrayChildren in gc/Marking.cpp
JS::ExposeObjectToActiveJS(closure);
/* Call the handler. */
return handler(cx, obj, id, old, vp.address(), closure);
}
JS::ForceLexicalInitialization(JSContext *cx, HandleObject obj)
{
AssertHeapIsIdle();
CHECK_REQUEST(cx);
assertSameCompartment(cx, obj);
bool initializedAny = false;
NativeObject* nobj = &obj->as<NativeObject>();
for (Shape::Range<NoGC> r(nobj->lastProperty()); !r.empty(); r.popFront()) {
Shape* s = &r.front();
Value v = nobj->getSlot(s->slot());
if (s->isDataProperty() && v.isMagic() && v.whyMagic() == JS_UNINITIALIZED_LEXICAL) {
nobj->setSlot(s->slot(), UndefinedValue());
initializedAny = true;
}
}
return initializedAny;
}
