gecko/js/xpconnect/wrappers/ChromeObjectWrapper.h

60 lines
2.4 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 "mozilla/Attributes.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, JS::Handle<JSObject*> wrapper,
JS::Handle<jsid> id, js::PropertyDescriptor *desc,
unsigned flags) MOZ_OVERRIDE;
virtual bool has(JSContext *cx, JS::Handle<JSObject*> wrapper,
JS::Handle<jsid> id, bool *bp) MOZ_OVERRIDE;
virtual bool get(JSContext *cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> receiver,
JS::Handle<jsid> id, JS::MutableHandle<JS::Value> vp) MOZ_OVERRIDE;
virtual bool objectClassIs(JS::Handle<JSObject*> obj, js::ESClassValue classValue,
JSContext *cx) MOZ_OVERRIDE;
virtual bool enter(JSContext *cx, JS::Handle<JSObject*> wrapper, JS::Handle<jsid> id,
js::Wrapper::Action act, bool *bp) 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__ */