1 | /* |
2 | * Copyright (C) 2011-2018 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 | #pragma once |
30 | |
31 | #include <wtf/Assertions.h> |
32 | #include <wtf/MetaAllocatorPtr.h> |
33 | #include <wtf/RedBlackTree.h> |
34 | #include <wtf/ThreadSafeRefCounted.h> |
35 | |
36 | namespace WTF { |
37 | |
38 | class MetaAllocator; |
39 | class PrintStream; |
40 | |
41 | class MetaAllocatorHandle : public ThreadSafeRefCounted<MetaAllocatorHandle>, public RedBlackTree<MetaAllocatorHandle, void*>::Node { |
42 | private: |
43 | MetaAllocatorHandle(MetaAllocator*, void* start, size_t sizeInBytes, void* ownerUID); |
44 | |
45 | public: |
46 | using MemoryPtr = MetaAllocatorPtr<HandleMemoryPtrTag>; |
47 | |
48 | WTF_EXPORT_PRIVATE ~MetaAllocatorHandle(); |
49 | |
50 | MemoryPtr start() const |
51 | { |
52 | return m_start; |
53 | } |
54 | |
55 | MemoryPtr end() const |
56 | { |
57 | return m_end; |
58 | } |
59 | |
60 | uintptr_t startAsInteger() const |
61 | { |
62 | return m_start.untaggedPtr<uintptr_t>(); |
63 | } |
64 | |
65 | uintptr_t endAsInteger() const |
66 | { |
67 | return m_end.untaggedPtr<uintptr_t>(); |
68 | } |
69 | |
70 | size_t sizeInBytes() const |
71 | { |
72 | return m_end.untaggedPtr<size_t>() - m_start.untaggedPtr<size_t>(); |
73 | } |
74 | |
75 | bool containsIntegerAddress(uintptr_t address) const |
76 | { |
77 | return address >= startAsInteger() && address < endAsInteger(); |
78 | } |
79 | |
80 | bool contains(void* address) const |
81 | { |
82 | return containsIntegerAddress(reinterpret_cast<uintptr_t>(address)); |
83 | } |
84 | |
85 | WTF_EXPORT_PRIVATE void shrink(size_t newSizeInBytes); |
86 | |
87 | bool isManaged() |
88 | { |
89 | return !!m_allocator; |
90 | } |
91 | |
92 | MetaAllocator* allocator() |
93 | { |
94 | ASSERT(m_allocator); |
95 | return m_allocator; |
96 | } |
97 | |
98 | void* ownerUID() |
99 | { |
100 | return m_ownerUID; |
101 | } |
102 | |
103 | void* key() |
104 | { |
105 | return m_start.untaggedPtr(); |
106 | } |
107 | |
108 | WTF_EXPORT_PRIVATE void dump(PrintStream& out) const; |
109 | |
110 | private: |
111 | friend class MetaAllocator; |
112 | |
113 | MetaAllocator* m_allocator; |
114 | MemoryPtr m_start; |
115 | MemoryPtr m_end; |
116 | void* m_ownerUID; |
117 | }; |
118 | |
119 | } |
120 | |