1 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 : *
3 : * ***** BEGIN LICENSE BLOCK *****
4 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 : *
6 : * The contents of this file are subject to the Mozilla Public License Version
7 : * 1.1 (the "License"); you may not use this file except in compliance with
8 : * the License. You may obtain a copy of the License at
9 : * http://www.mozilla.org/MPL/
10 : *
11 : * Software distributed under the License is distributed on an "AS IS" basis,
12 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 : * for the specific language governing rights and limitations under the
14 : * License.
15 : *
16 : * The Original Code is an implementation of watchpoints for SpiderMonkey.
17 : *
18 : * The Initial Developer of the Original Code is
19 : * Mozilla Foundation.
20 : * Portions created by the Initial Developer are Copyright (C) 2011
21 : * the Initial Developer. All Rights Reserved.
22 : *
23 : * Contributor(s):
24 : * Jason Orendorff <jorendorff@mozilla.com>
25 : *
26 : * Alternatively, the contents of this file may be used under the terms of
27 : * either the GNU General Public License Version 2 or later (the "GPL"), or
28 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 : * in which case the provisions of the GPL or the LGPL are applicable instead
30 : * of those above. If you wish to allow use of your version of this file only
31 : * under the terms of either the GPL or the LGPL, and not to allow others to
32 : * use your version of this file under the terms of the MPL, indicate your
33 : * decision by deleting the provisions above and replace them with the notice
34 : * and other provisions required by the GPL or the LGPL. If you do not delete
35 : * the provisions above, a recipient may use your version of this file under
36 : * the terms of any one of the MPL, the GPL or the LGPL.
37 : *
38 : * ***** END LICENSE BLOCK ***** */
39 :
40 : #ifndef jswatchpoint_h___
41 : #define jswatchpoint_h___
42 :
43 : #include "jsalloc.h"
44 : #include "jsprvtd.h"
45 : #include "jsapi.h"
46 : #include "jsfriendapi.h"
47 :
48 : #include "gc/Barrier.h"
49 : #include "js/HashTable.h"
50 :
51 : namespace js {
52 :
53 54129 : struct WatchKey {
54 25698 : WatchKey() {}
55 8036 : WatchKey(JSObject *obj, jsid id) : object(obj), id(id) {}
56 3783 : WatchKey(const WatchKey &key) : object(key.object.get()), id(key.id.get()) {}
57 : HeapPtrObject object;
58 : HeapId id;
59 : };
60 :
61 75736 : struct Watchpoint {
62 : JSWatchPointHandler handler;
63 : HeapPtrObject closure;
64 : bool held; /* true if currently running handler */
65 : };
66 :
67 : template <>
68 : struct DefaultHasher<WatchKey> {
69 : typedef WatchKey Lookup;
70 : static inline js::HashNumber hash(const Lookup &key);
71 :
72 5796 : static bool match(const WatchKey &k, const Lookup &l) {
73 5796 : return k.object == l.object && k.id.get() == l.id.get();
74 : }
75 : };
76 :
77 450 : class WatchpointMap {
78 : public:
79 : typedef HashMap<WatchKey, Watchpoint, DefaultHasher<WatchKey>, SystemAllocPolicy> Map;
80 :
81 : bool init();
82 : bool watch(JSContext *cx, JSObject *obj, jsid id,
83 : JSWatchPointHandler handler, JSObject *closure);
84 : void unwatch(JSObject *obj, jsid id,
85 : JSWatchPointHandler *handlerp, JSObject **closurep);
86 : void unwatchObject(JSObject *obj);
87 : void clear();
88 :
89 : bool triggerWatchpoint(JSContext *cx, JSObject *obj, jsid id, Value *vp);
90 :
91 : static bool markAllIteratively(JSTracer *trc);
92 : bool markIteratively(JSTracer *trc);
93 : void markAll(JSTracer *trc);
94 : static void sweepAll(JSRuntime *rt);
95 : void sweep();
96 :
97 : static void traceAll(WeakMapTracer *trc);
98 : void trace(WeakMapTracer *trc);
99 :
100 : private:
101 : Map map;
102 : };
103 :
104 : }
105 :
106 : #endif /* jswatchpoint_h___ */
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