gecko/js/src/jswatchpoint.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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 * ***** 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
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 *
 * 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 an implementation of watchpoints for SpiderMonkey.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Jason Orendorff <jorendorff@mozilla.com>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
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#ifndef jswatchpoint_h___
#define jswatchpoint_h___

#include "jshashtable.h"
#include "jsprvtd.h"
#include "jsapi.h"
#include "jsvalue.h"

namespace js {

struct WatchKey {
    WatchKey() {}
    WatchKey(JSObject *obj, jsid id) : object(obj), id(id) {}
    JSObject *object;
    jsid id;
};

struct Watchpoint {
    JSWatchPointHandler handler;
    JSObject *closure;
    bool held;  /* true if currently running handler */
};

template <>
struct DefaultHasher<WatchKey> {
    typedef WatchKey Lookup;
    static inline js::HashNumber hash(const Lookup &key);

    static bool match(const WatchKey &k, const Lookup &l) {
        return k.object == l.object && k.id == l.id;
    }
};

class WatchpointMap {
  public:
    typedef HashMap<WatchKey, Watchpoint, DefaultHasher<WatchKey>, SystemAllocPolicy> Map;

    bool init();
    bool watch(JSContext *cx, JSObject *obj, jsid id,
               JSWatchPointHandler handler, JSObject *closure);
    void unwatch(JSObject *obj, jsid id,
                 JSWatchPointHandler *handlerp, JSObject **closurep);
    void unwatchObject(JSObject *obj);
    void clear();

    bool triggerWatchpoint(JSContext *cx, JSObject *obj, jsid id, Value *vp);

    static bool markAllIteratively(JSTracer *trc);
    bool markIteratively(JSTracer *trc);
    static void sweepAll(JSRuntime *rt);
    void sweep();

  private:
    Map map;
};

}

#endif /* jswatchpoint_h___ */