1/*
2 * Copyright (C) 2011, 2013, 2015 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;
40class PrintStream;
41
42class MetaAllocatorHandle : public ThreadSafeRefCounted<MetaAllocatorHandle>, public RedBlackTree<MetaAllocatorHandle, void*>::Node {
43private:
44 MetaAllocatorHandle(MetaAllocator*, void* start, size_t sizeInBytes, void* ownerUID);
45
46public:
47 WTF_EXPORT_PRIVATE ~MetaAllocatorHandle();
48
49 void* start() const
50 {
51 return m_start;
52 }
53
54 void* end() const
55 {
56 return reinterpret_cast<void*>(endAsInteger());
57 }
58
59 uintptr_t startAsInteger() const
60 {
61 return reinterpret_cast<uintptr_t>(m_start);
62 }
63
64 uintptr_t endAsInteger() const
65 {
66 return startAsInteger() + m_sizeInBytes;
67 }
68
69 size_t sizeInBytes() const
70 {
71 return m_sizeInBytes;
72 }
73
74 bool containsIntegerAddress(uintptr_t address) const
75 {
76 return address - startAsInteger() < sizeInBytes();
77 }
78
79 bool contains(void* address) const
80 {
81 return containsIntegerAddress(reinterpret_cast<uintptr_t>(address));
82 }
83
84 WTF_EXPORT_PRIVATE void shrink(size_t newSizeInBytes);
85
86 bool isManaged()
87 {
88 return !!m_allocator;
89 }
90
91 MetaAllocator* allocator()
92 {
93 ASSERT(m_allocator);
94 return m_allocator;
95 }
96
97 void* ownerUID()
98 {
99 return m_ownerUID;
100 }
101
102 void* key()
103 {
104 return m_start;
105 }
106
107 WTF_EXPORT_PRIVATE void dump(PrintStream& out) const;
108
109private:
110 friend class MetaAllocator;
111
112 MetaAllocator* m_allocator;
113 void* m_start;
114 size_t m_sizeInBytes;
115 void* m_ownerUID;
116};
117
118}
119
120#endif
121