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gecko/js/src/jsproxy.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
* May 28, 2008.
*
* The Initial Developer of the Original Code is
* Mozilla Foundation
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Andreas Gal <gal@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsproxy_h___
#define jsproxy_h___
#include "jsapi.h"
#include "jsobj.h"
namespace js {
/* Base class for all C++ proxy handlers. */
class JSProxyHandler {
public:
virtual ~JSProxyHandler();
/* ES5 Harmony fundamental proxy traps. */
virtual bool getPropertyDescriptor(JSContext *cx, JSObject *proxy, jsid id,
JSPropertyDescriptor *desc) = 0;
virtual bool getOwnPropertyDescriptor(JSContext *cx, JSObject *proxy, jsid id,
JSPropertyDescriptor *desc) = 0;
virtual bool defineProperty(JSContext *cx, JSObject *proxy, jsid id,
JSPropertyDescriptor *desc) = 0;
virtual bool getOwnPropertyNames(JSContext *cx, JSObject *proxy, JSIdArray **idap) = 0;
virtual bool delete_(JSContext *cx, JSObject *proxy, jsid id, bool *bp) = 0;
virtual bool enumerate(JSContext *cx, JSObject *proxy, JSIdArray **idap) = 0;
virtual bool fix(JSContext *cx, JSObject *proxy, jsval *vp) = 0;
/* ES5 Harmony derived proxy traps. */
virtual bool has(JSContext *cx, JSObject *proxy, jsid id, bool *bp);
virtual bool hasOwn(JSContext *cx, JSObject *proxy, jsid id, bool *bp);
virtual bool get(JSContext *cx, JSObject *proxy, JSObject *receiver, jsid id, jsval *vp);
virtual bool set(JSContext *cx, JSObject *proxy, JSObject *receiver, jsid id, jsval *vp);
virtual bool enumerateOwn(JSContext *cx, JSObject *proxy, JSIdArray **idap);
virtual bool iterate(JSContext *cx, JSObject *proxy, uintN flags, jsval *vp);
/* Spidermonkey extensions. */
virtual void finalize(JSContext *cx, JSObject *proxy);
virtual void trace(JSTracer *trc, JSObject *proxy);
virtual const void *family() = 0;
};
/* No-op wrapper handler base class. */
class JSNoopProxyHandler {
JSObject *mWrappedObject;
protected:
JS_FRIEND_API(JSNoopProxyHandler(JSObject *));
public:
JS_FRIEND_API(virtual ~JSNoopProxyHandler());
/* ES5 Harmony fundamental proxy traps. */
virtual JS_FRIEND_API(bool) getPropertyDescriptor(JSContext *cx, JSObject *proxy, jsid id,
JSPropertyDescriptor *desc);
virtual JS_FRIEND_API(bool) getOwnPropertyDescriptor(JSContext *cx, JSObject *proxy, jsid id,
JSPropertyDescriptor *desc);
virtual JS_FRIEND_API(bool) defineProperty(JSContext *cx, JSObject *proxy, jsid id,
JSPropertyDescriptor *desc);
virtual JS_FRIEND_API(bool) getOwnPropertyNames(JSContext *cx, JSObject *proxy,
JSIdArray **idap);
virtual JS_FRIEND_API(bool) delete_(JSContext *cx, JSObject *proxy, jsid id, bool *bp);
virtual JS_FRIEND_API(bool) enumerate(JSContext *cx, JSObject *proxy, JSIdArray **idap);
virtual JS_FRIEND_API(bool) fix(JSContext *cx, JSObject *proxy, jsval *vp);
/* ES5 Harmony derived proxy traps. */
virtual JS_FRIEND_API(bool) has(JSContext *cx, JSObject *proxy, jsid id, bool *bp);
virtual JS_FRIEND_API(bool) hasOwn(JSContext *cx, JSObject *proxy, jsid id, bool *bp);
virtual JS_FRIEND_API(bool) get(JSContext *cx, JSObject *proxy, JSObject *receiver, jsid id,
jsval *vp);
virtual JS_FRIEND_API(bool) set(JSContext *cx, JSObject *proxy, JSObject *receiver, jsid id,
jsval *vp);
virtual JS_FRIEND_API(bool) enumerateOwn(JSContext *cx, JSObject *proxy, JSIdArray **idap);
virtual JS_FRIEND_API(bool) iterate(JSContext *cx, JSObject *proxy, uintN flags, jsval *vp);
/* Spidermonkey extensions. */
virtual JS_FRIEND_API(void) finalize(JSContext *cx, JSObject *proxy);
virtual JS_FRIEND_API(void) trace(JSTracer *trc, JSObject *proxy);
virtual JS_FRIEND_API(const void *) family();
static JSNoopProxyHandler singleton;
template <class T>
static JSObject *wrap(JSContext *cx, JSObject *obj, JSObject *proto, JSObject *parent,
JSString *className);
inline JSObject *wrappedObject(JSObject *proxy) {
return mWrappedObject ? mWrappedObject : JSVAL_TO_OBJECT(proxy->getProxyPrivate());
}
};
/* Dispatch point for handlers that executes the appropriate C++ or scripted traps. */
class JSProxy {
public:
/* ES5 Harmony fundamental proxy traps. */
static bool getPropertyDescriptor(JSContext *cx, JSObject *proxy, jsid id,
JSPropertyDescriptor *desc);
static bool getPropertyDescriptor(JSContext *cx, JSObject *proxy, jsid id, jsval *vp);
static bool getOwnPropertyDescriptor(JSContext *cx, JSObject *proxy, jsid id,
JSPropertyDescriptor *desc);
static bool getOwnPropertyDescriptor(JSContext *cx, JSObject *proxy, jsid id, jsval *vp);
static bool defineProperty(JSContext *cx, JSObject *proxy, jsid id, JSPropertyDescriptor *desc);
static bool defineProperty(JSContext *cx, JSObject *proxy, jsid id, jsval v);
static bool getOwnPropertyNames(JSContext *cx, JSObject *proxy, JSIdArray **idap);
static bool delete_(JSContext *cx, JSObject *proxy, jsid id, bool *bp);
static bool enumerate(JSContext *cx, JSObject *proxy, JSIdArray **idap);
static bool fix(JSContext *cx, JSObject *proxy, jsval *vp);
/* ES5 Harmony derived proxy traps. */
static bool has(JSContext *cx, JSObject *proxy, jsid id, bool *bp);
static bool hasOwn(JSContext *cx, JSObject *proxy, jsid id, bool *bp);
static bool get(JSContext *cx, JSObject *proxy, JSObject *receiver, jsid id, jsval *vp);
static bool set(JSContext *cx, JSObject *proxy, JSObject *receiver, jsid id, jsval *vp);
static bool enumerateOwn(JSContext *cx, JSObject *proxy, JSIdArray **idap);
static bool iterate(JSContext *cx, JSObject *proxy, uintN flags, jsval *vp);
};
/* Shared between object and function proxies. */
const uint32 JSSLOT_PROXY_HANDLER = JSSLOT_PRIVATE + 0;
/* Object proxies only. */
const uint32 JSSLOT_PROXY_CLASS = JSSLOT_PRIVATE + 1;
const uint32 JSSLOT_PROXY_PRIVATE = JSSLOT_PRIVATE + 2;
/* Function proxies only. */
const uint32 JSSLOT_PROXY_CALL = JSSLOT_PRIVATE + 1;
const uint32 JSSLOT_PROXY_CONSTRUCT = JSSLOT_PRIVATE + 2;
extern JS_FRIEND_API(JSClass) ObjectProxyClass;
extern JS_FRIEND_API(JSClass) FunctionProxyClass;
extern JSClass CallableObjectClass;
}
inline bool
JSObject::isObjectProxy() const
{
return getClass() == &js::ObjectProxyClass;
}
inline bool
JSObject::isFunctionProxy() const
{
return getClass() == &js::FunctionProxyClass;
}
inline bool
JSObject::isProxy() const
{
return isObjectProxy() || isFunctionProxy();
}
inline jsval
JSObject::getProxyHandler() const
{
JS_ASSERT(isProxy());
jsval handler = fslots[js::JSSLOT_PROXY_HANDLER];
JS_ASSERT(JSVAL_IS_OBJECT(handler) || JSVAL_IS_INT(handler));
return handler;
}
inline jsval
JSObject::getProxyPrivate() const
{
JS_ASSERT(isObjectProxy());
return fslots[js::JSSLOT_PROXY_PRIVATE];
}
inline void
JSObject::setProxyPrivate(jsval priv)
{
JS_ASSERT(isObjectProxy());
fslots[js::JSSLOT_PROXY_PRIVATE] = priv;
}
namespace js {
JS_FRIEND_API(JSObject *)
NewObjectProxy(JSContext *cx, jsval handler, JSObject *proto, JSObject *parent,
JSString *className);
JS_FRIEND_API(JSObject *)
NewFunctionProxy(JSContext *cx, jsval handler, JSObject *proto, JSObject *parent,
JSObject *call, JSObject *construct);
JS_FRIEND_API(JSBool)
GetProxyObjectClass(JSContext *cx, JSObject *proxy, const char **namep);
JS_FRIEND_API(JSBool)
FixProxy(JSContext *cx, JSObject *proxy, JSBool *bp);
template <class T>
JSObject *
JSNoopProxyHandler::wrap(JSContext *cx, JSObject *obj, JSObject *proto, JSObject *parent,
JSString *className)
{
if (obj->isCallable()) {
JSNoopProxyHandler *handler = new T(obj);
if (!handler)
return NULL;
JSObject *wrapper = NewFunctionProxy(cx, PRIVATE_TO_JSVAL(handler), proto, parent,
obj, NULL);
if (!wrapper)
delete handler;
return wrapper;
}
JSObject *wrapper = NewObjectProxy(cx, PRIVATE_TO_JSVAL(&T::singleton), proto, parent,
className);
if (wrapper)
wrapper->setProxyPrivate(OBJECT_TO_JSVAL(obj));
return wrapper;
}
}
JS_BEGIN_EXTERN_C
extern JS_FRIEND_API(JSObject *)
js_InitProxyClass(JSContext *cx, JSObject *obj);
JS_END_EXTERN_C
#endif
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