The Tor Browser: js/xpconnect/wrappers/ChromeObjectWrapper.h@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 #ifndef __ChromeObjectWrapper_h__

     8 #define __ChromeObjectWrapper_h__

    10 #include "mozilla/Attributes.h"

    12 #include "FilteringWrapper.h"

    14 namespace xpc {

    16 struct ExposedPropertiesOnly;

    18 // When chrome JS objects are exposed to content, they get a ChromeObjectWrapper.

    19 //

    20 // The base filtering wrapper here does most of the work for us. We define a

    21 // custom class here to introduce custom behavior with respect to the prototype

    22 // chain.

    23 #define ChromeObjectWrapperBase \

    24   FilteringWrapper<js::CrossCompartmentSecurityWrapper, ExposedPropertiesOnly>

    26 class ChromeObjectWrapper : public ChromeObjectWrapperBase

    27 {

    28   public:

    29     ChromeObjectWrapper() : ChromeObjectWrapperBase(0) {}

    31     /* Custom traps. */

    32     virtual bool getPropertyDescriptor(JSContext *cx, JS::Handle<JSObject*> wrapper,

    33                                        JS::Handle<jsid> id,

    34                                        JS::MutableHandle<JSPropertyDescriptor> desc) MOZ_OVERRIDE;

    35     virtual bool has(JSContext *cx, JS::Handle<JSObject*> wrapper,

    36                      JS::Handle<jsid> id, bool *bp) MOZ_OVERRIDE;

    37     virtual bool get(JSContext *cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> receiver,

    38                      JS::Handle<jsid> id, JS::MutableHandle<JS::Value> vp) MOZ_OVERRIDE;

    40     virtual bool objectClassIs(JS::Handle<JSObject*> obj, js::ESClassValue classValue,

    41                                JSContext *cx) MOZ_OVERRIDE;

    43     virtual bool enter(JSContext *cx, JS::Handle<JSObject*> wrapper, JS::Handle<jsid> id,

    44                        js::Wrapper::Action act, bool *bp) MOZ_OVERRIDE;

    46     // NB: One might think we'd need to implement enumerate(), keys(), iterate(),

    47     // and getPropertyNames() here. However, ES5 built-in properties aren't

    48     // enumerable (and SpiderMonkey's implementation seems to match the spec

    49     // modulo Error.prototype.fileName and Error.prototype.lineNumber). Since

    50     // we're only remapping the prototypes of standard objects, there would

    51     // never be anything more to enumerate up the prototype chain. So we can

    52     // atually skip these.

    54     static ChromeObjectWrapper singleton;

    55 };

    57 } /* namespace xpc */

    59 #endif /* __ChromeObjectWrapper_h__ */

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