michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "vm/ProxyObject.h"
michael@0: 
michael@0: #include "jscompartment.h"
michael@0: #include "jsgcinlines.h"
michael@0: #include "jsinferinlines.h"
michael@0: #include "jsobjinlines.h"
michael@0: 
michael@0: using namespace js;
michael@0: 
michael@0: /* static */ ProxyObject *
michael@0: ProxyObject::New(JSContext *cx, BaseProxyHandler *handler, HandleValue priv, TaggedProto proto_,
michael@0:                  JSObject *parent_, const ProxyOptions &options)
michael@0: {
michael@0:     Rooted<TaggedProto> proto(cx, proto_);
michael@0:     RootedObject parent(cx, parent_);
michael@0: 
michael@0:     const Class *clasp = options.clasp();
michael@0: 
michael@0:     JS_ASSERT(isValidProxyClass(clasp));
michael@0:     JS_ASSERT_IF(proto.isObject(), cx->compartment() == proto.toObject()->compartment());
michael@0:     JS_ASSERT_IF(parent, cx->compartment() == parent->compartment());
michael@0: 
michael@0:     /*
michael@0:      * Eagerly mark properties unknown for proxies, so we don't try to track
michael@0:      * their properties and so that we don't need to walk the compartment if
michael@0:      * their prototype changes later.  But don't do this for DOM proxies,
michael@0:      * because we want to be able to keep track of them in typesets in useful
michael@0:      * ways.
michael@0:      */
michael@0:     if (proto.isObject() && !options.singleton() && !clasp->isDOMClass()) {
michael@0:         RootedObject protoObj(cx, proto.toObject());
michael@0:         if (!JSObject::setNewTypeUnknown(cx, clasp, protoObj))
michael@0:             return nullptr;
michael@0:     }
michael@0: 
michael@0:     NewObjectKind newKind = options.singleton() ? SingletonObject : GenericObject;
michael@0:     gc::AllocKind allocKind = gc::GetGCObjectKind(clasp);
michael@0:     if (handler->finalizeInBackground(priv))
michael@0:         allocKind = GetBackgroundAllocKind(allocKind);
michael@0:     RootedObject obj(cx, NewObjectWithGivenProto(cx, clasp, proto, parent, allocKind, newKind));
michael@0:     if (!obj)
michael@0:         return nullptr;
michael@0: 
michael@0:     Rooted<ProxyObject*> proxy(cx, &obj->as<ProxyObject>());
michael@0:     proxy->initHandler(handler);
michael@0:     proxy->initCrossCompartmentPrivate(priv);
michael@0: 
michael@0:     /* Don't track types of properties of non-DOM and non-singleton proxies. */
michael@0:     if (newKind != SingletonObject && !clasp->isDOMClass())
michael@0:         MarkTypeObjectUnknownProperties(cx, proxy->type());
michael@0: 
michael@0:     return proxy;
michael@0: }
michael@0: 
michael@0: void
michael@0: ProxyObject::initCrossCompartmentPrivate(HandleValue priv)
michael@0: {
michael@0:     initCrossCompartmentSlot(PRIVATE_SLOT, priv);
michael@0: }
michael@0: 
michael@0: void
michael@0: ProxyObject::initHandler(BaseProxyHandler *handler)
michael@0: {
michael@0:     initSlot(HANDLER_SLOT, PrivateValue(handler));
michael@0: }
michael@0: 
michael@0: static void
michael@0: NukeSlot(ProxyObject *proxy, uint32_t slot)
michael@0: {
michael@0:     Value old = proxy->getSlot(slot);
michael@0:     if (old.isMarkable()) {
michael@0:         Zone *zone = ZoneOfValue(old);
michael@0:         AutoMarkInDeadZone amd(zone);
michael@0:         proxy->setReservedSlot(slot, NullValue());
michael@0:     } else {
michael@0:         proxy->setReservedSlot(slot, NullValue());
michael@0:     }
michael@0: }
michael@0: 
michael@0: void
michael@0: ProxyObject::nuke(BaseProxyHandler *handler)
michael@0: {
michael@0:     /* Allow people to add their own number of reserved slots beyond the expected 4 */
michael@0:     unsigned numSlots = JSCLASS_RESERVED_SLOTS(getClass());
michael@0:     for (unsigned i = 0; i < numSlots; i++)
michael@0:         NukeSlot(this, i);
michael@0:     /* Restore the handler as requested after nuking. */
michael@0:     setHandler(handler);
michael@0: }