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1 /*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #ifndef StorageBarrier_h
27 #define StorageBarrier_h
28
29 #include "JSGlobalData.h"
30 #include "WriteBarrier.h"
31
32 namespace JSC {
33
34 typedef WriteBarrierBase<Unknown>* PropertyStorage;
35 typedef const WriteBarrierBase<Unknown>* ConstPropertyStorage;
36
37 class StorageBarrier {
38 public:
39 enum UncheckedTag { Unchecked };
40 StorageBarrier(JSGlobalData& globalData, JSCell* owner, PropertyStorage storage)
41 {
42 set(globalData, owner, storage);
43 }
44
45 StorageBarrier(PropertyStorage storage, UncheckedTag)
46 {
47 set(storage, Unchecked);
48 }
49
50 void set(JSGlobalData&, JSCell*, PropertyStorage newStorage)
51 {
52 m_storage = newStorage;
53 }
54
55 void set(PropertyStorage newStorage, UncheckedTag)
56 {
57 m_storage = newStorage;
58 }
59
60 WriteBarrierBase<Unknown>* operator->() const { return m_storage; }
61 WriteBarrierBase<Unknown>* operator->() { return m_storage; }
62 WriteBarrierBase<Unknown> operator*() const { return *m_storage; }
63 WriteBarrierBase<Unknown> operator*() { return *m_storage; }
64 const WriteBarrierBase<Unknown>& operator[](size_t i) const { return m_storage[i]; }
65 WriteBarrierBase<Unknown>& operator[](size_t i) { return m_storage[i]; }
66
67 ConstPropertyStorage get() const { return m_storage; }
68 PropertyStorage get() { return m_storage; }
69
70 private:
71 PropertyStorage m_storage;
72 };
73
74 }
75
76 #endif