The Tor Browser / file comparison
comparison: js/src/vm/ProxyObject.cpp
js/src/vm/ProxyObject.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:fcf49f02dc39 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #include "vm/ProxyObject.h" | |
| 8 | |
| 9 #include "jscompartment.h" | |
| 10 #include "jsgcinlines.h" | |
| 11 #include "jsinferinlines.h" | |
| 12 #include "jsobjinlines.h" | |
| 13 | |
| 14 using namespace js; | |
| 15 | |
| 16 /* static */ ProxyObject * | |
| 17 ProxyObject::New(JSContext *cx, BaseProxyHandler *handler, HandleValue priv, TaggedProto proto_, | |
| 18 JSObject *parent_, const ProxyOptions &options) | |
| 19 { | |
| 20 Rooted<TaggedProto> proto(cx, proto_); | |
| 21 RootedObject parent(cx, parent_); | |
| 22 | |
| 23 const Class *clasp = options.clasp(); | |
| 24 | |
| 25 JS_ASSERT(isValidProxyClass(clasp)); | |
| 26 JS_ASSERT_IF(proto.isObject(), cx->compartment() == proto.toObject()->compartment()); | |
| 27 JS_ASSERT_IF(parent, cx->compartment() == parent->compartment()); | |
| 28 | |
| 29 /* | |
| 30 * Eagerly mark properties unknown for proxies, so we don't try to track | |
| 31 * their properties and so that we don't need to walk the compartment if | |
| 32 * their prototype changes later. But don't do this for DOM proxies, | |
| 33 * because we want to be able to keep track of them in typesets in useful | |
| 34 * ways. | |
| 35 */ | |
| 36 if (proto.isObject() && !options.singleton() && !clasp->isDOMClass()) { | |
| 37 RootedObject protoObj(cx, proto.toObject()); | |
| 38 if (!JSObject::setNewTypeUnknown(cx, clasp, protoObj)) | |
| 39 return nullptr; | |
| 40 } | |
| 41 | |
| 42 NewObjectKind newKind = options.singleton() ? SingletonObject : GenericObject; | |
| 43 gc::AllocKind allocKind = gc::GetGCObjectKind(clasp); | |
| 44 if (handler->finalizeInBackground(priv)) | |
| 45 allocKind = GetBackgroundAllocKind(allocKind); | |
| 46 RootedObject obj(cx, NewObjectWithGivenProto(cx, clasp, proto, parent, allocKind, newKind)); | |
| 47 if (!obj) | |
| 48 return nullptr; | |
| 49 | |
| 50 Rooted<ProxyObject*> proxy(cx, &obj->as<ProxyObject>()); | |
| 51 proxy->initHandler(handler); | |
| 52 proxy->initCrossCompartmentPrivate(priv); | |
| 53 | |
| 54 /* Don't track types of properties of non-DOM and non-singleton proxies. */ | |
| 55 if (newKind != SingletonObject && !clasp->isDOMClass()) | |
| 56 MarkTypeObjectUnknownProperties(cx, proxy->type()); | |
| 57 | |
| 58 return proxy; | |
| 59 } | |
| 60 | |
| 61 void | |
| 62 ProxyObject::initCrossCompartmentPrivate(HandleValue priv) | |
| 63 { | |
| 64 initCrossCompartmentSlot(PRIVATE_SLOT, priv); | |
| 65 } | |
| 66 | |
| 67 void | |
| 68 ProxyObject::initHandler(BaseProxyHandler *handler) | |
| 69 { | |
| 70 initSlot(HANDLER_SLOT, PrivateValue(handler)); | |
| 71 } | |
| 72 | |
| 73 static void | |
| 74 NukeSlot(ProxyObject *proxy, uint32_t slot) | |
| 75 { | |
| 76 Value old = proxy->getSlot(slot); | |
| 77 if (old.isMarkable()) { | |
| 78 Zone *zone = ZoneOfValue(old); | |
| 79 AutoMarkInDeadZone amd(zone); | |
| 80 proxy->setReservedSlot(slot, NullValue()); | |
| 81 } else { | |
| 82 proxy->setReservedSlot(slot, NullValue()); | |
| 83 } | |
| 84 } | |
| 85 | |
| 86 void | |
| 87 ProxyObject::nuke(BaseProxyHandler *handler) | |
| 88 { | |
| 89 /* Allow people to add their own number of reserved slots beyond the expected 4 */ | |
| 90 unsigned numSlots = JSCLASS_RESERVED_SLOTS(getClass()); | |
| 91 for (unsigned i = 0; i < numSlots; i++) | |
| 92 NukeSlot(this, i); | |
| 93 /* Restore the handler as requested after nuking. */ | |
| 94 setHandler(handler); | |
| 95 } |
