1/*
2 * Copyright (C) 2009 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef PtrAndFlags_h
32#define PtrAndFlags_h
33
34#include <wtf/Assertions.h>
35
36namespace WTF {
37 template<class T, typename FlagEnum> class PtrAndFlagsBase {
38 public:
39 bool isFlagSet(FlagEnum flagNumber) const { ASSERT(flagNumber < 2); return m_ptrAndFlags & (1 << flagNumber); }
40 void setFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags |= (1 << flagNumber);}
41 void clearFlag(FlagEnum flagNumber) { ASSERT(flagNumber < 2); m_ptrAndFlags &= ~(1 << flagNumber);}
42 T* get() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); }
43 void set(T* ptr)
44 {
45 ASSERT(!(reinterpret_cast<intptr_t>(ptr) & 3));
46 m_ptrAndFlags = reinterpret_cast<intptr_t>(ptr) | (m_ptrAndFlags & 3);
47#ifndef NDEBUG
48 m_leaksPtr = ptr;
49#endif
50 }
51
52 bool operator!() const { return !get(); }
53 T* operator->() const { return reinterpret_cast<T*>(m_ptrAndFlags & ~3); }
54
55 protected:
56 intptr_t m_ptrAndFlags;
57#ifndef NDEBUG
58 void* m_leaksPtr; // Only used to allow tools like leaks on OSX to detect that the memory is referenced.
59#endif
60 };
61
62 template<class T, typename FlagEnum> class PtrAndFlags : public PtrAndFlagsBase<T, FlagEnum> {
63 public:
64 PtrAndFlags()
65 {
66 PtrAndFlagsBase<T, FlagEnum>::m_ptrAndFlags = 0;
67 }
68 PtrAndFlags(T* ptr)
69 {
70 PtrAndFlagsBase<T, FlagEnum>::m_ptrAndFlags = 0;
71 PtrAndFlagsBase<T, FlagEnum>::set(ptr);
72 }
73 };
74} // namespace WTF
75
76using WTF::PtrAndFlagsBase;
77using WTF::PtrAndFlags;
78
79#endif // PtrAndFlags_h
80

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/wtf/PtrAndFlags.h