The Tor Browser: js/src/vm/ProxyObject.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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/. */

     7 #include "vm/ProxyObject.h"

     9 #include "jscompartment.h"

    10 #include "jsgcinlines.h"

    11 #include "jsinferinlines.h"

    12 #include "jsobjinlines.h"

    14 using namespace js;

    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_);

    23     const Class *clasp = options.clasp();

    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());

    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     }

    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;

    50     Rooted<ProxyObject*> proxy(cx, &obj->as<ProxyObject>());

    51     proxy->initHandler(handler);

    52     proxy->initCrossCompartmentPrivate(priv);

    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());

    58     return proxy;

    59 }

    61 void

    62 ProxyObject::initCrossCompartmentPrivate(HandleValue priv)

    63 {

    64     initCrossCompartmentSlot(PRIVATE_SLOT, priv);

    65 }

    67 void

    68 ProxyObject::initHandler(BaseProxyHandler *handler)

    69 {

    70     initSlot(HANDLER_SLOT, PrivateValue(handler));

    71 }

    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 }

    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 }

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