gecko-dev/js/xpconnect/wrappers/ChromeObjectWrapper.h

52 lines
2.0 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99 ft=cpp:
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef __ChromeObjectWrapper_h__
#define __ChromeObjectWrapper_h__
#include "FilteringWrapper.h"
#include "AccessCheck.h"
namespace xpc {
// When chrome JS objects are exposed to content, they get a ChromeObjectWrapper.
//
// The base filtering wrapper here does most of the work for us. We define a
// custom class here to introduce custom behavior with respect to the prototype
// chain.
#define ChromeObjectWrapperBase \
FilteringWrapper<js::CrossCompartmentSecurityWrapper, ExposedPropertiesOnly>
class ChromeObjectWrapper : public ChromeObjectWrapperBase
{
public:
ChromeObjectWrapper() : ChromeObjectWrapperBase(0) {};
/* Custom traps. */
virtual bool getPropertyDescriptor(JSContext *cx, JSObject *wrapper,
jsid id, bool set,
js::PropertyDescriptor *desc) MOZ_OVERRIDE;
virtual bool has(JSContext *cx, JSObject *wrapper, jsid id,
bool *bp) MOZ_OVERRIDE;
virtual bool get(JSContext *cx, JSObject *wrapper, JSObject *receiver,
jsid id, js::Value *vp) MOZ_OVERRIDE;
// NB: One might think we'd need to implement enumerate(), keys(), iterate(),
// and getPropertyNames() here. However, ES5 built-in properties aren't
// enumerable (and SpiderMonkey's implementation seems to match the spec
// modulo Error.prototype.fileName and Error.prototype.lineNumber). Since
// we're only remapping the prototypes of standard objects, there would
// never be anything more to enumerate up the prototype chain. So we can
// atually skip these.
static ChromeObjectWrapper singleton;
};
} /* namespace xpc */
#endif /* __ChromeObjectWrapper_h__ */