1/*
2 * Copyright (C) 2011, 2013 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef WTF_MetaAllocatorHandle_h
30#define WTF_MetaAllocatorHandle_h
31
32#include <wtf/Assertions.h>
33#include <wtf/RedBlackTree.h>
34#include <wtf/ThreadSafeRefCounted.h>
35#include <wtf/RefPtr.h>
36
37namespace WTF {
38
39class MetaAllocator;
40
41class MetaAllocatorHandle : public ThreadSafeRefCounted<MetaAllocatorHandle>, public RedBlackTree<MetaAllocatorHandle, void*>::Node {
42private:
43    MetaAllocatorHandle(MetaAllocator*, void* start, size_t sizeInBytes, void* ownerUID);
44
45public:
46    WTF_EXPORT_PRIVATE ~MetaAllocatorHandle();
47
48    void* start() const
49    {
50        return m_start;
51    }
52
53    void* end() const
54    {
55        return reinterpret_cast<void*>(endAsInteger());
56    }
57
58    uintptr_t startAsInteger() const
59    {
60        return reinterpret_cast<uintptr_t>(m_start);
61    }
62
63    uintptr_t endAsInteger() const
64    {
65        return startAsInteger() + m_sizeInBytes;
66    }
67
68    size_t sizeInBytes() const
69    {
70        return m_sizeInBytes;
71    }
72
73    bool containsIntegerAddress(uintptr_t address) const
74    {
75        return address - startAsInteger() < sizeInBytes();
76    }
77
78    bool contains(void* address) const
79    {
80        return containsIntegerAddress(reinterpret_cast<uintptr_t>(address));
81    }
82
83    WTF_EXPORT_PRIVATE void shrink(size_t newSizeInBytes);
84
85    bool isManaged()
86    {
87        return !!m_allocator;
88    }
89
90    MetaAllocator* allocator()
91    {
92        ASSERT(m_allocator);
93        return m_allocator;
94    }
95
96    void* ownerUID()
97    {
98        return m_ownerUID;
99    }
100
101    void* key()
102    {
103        return m_start;
104    }
105
106private:
107    friend class MetaAllocator;
108
109    MetaAllocator* m_allocator;
110    void* m_start;
111    size_t m_sizeInBytes;
112    void* m_ownerUID;
113};
114
115}
116
117#endif
118