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Side by Side Diff: base/memory/aligned_memory.h

Issue 1549003002: Switch to standard integer types in base/memory/. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 12 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 // AlignedMemory is a POD type that gives you a portable way to specify static 5 // AlignedMemory is a POD type that gives you a portable way to specify static
6 // or local stack data of a given alignment and size. For example, if you need 6 // or local stack data of a given alignment and size. For example, if you need
7 // static storage for a class, but you want manual control over when the object 7 // static storage for a class, but you want manual control over when the object
8 // is constructed and destructed (you don't want static initialization and 8 // is constructed and destructed (you don't want static initialization and
9 // destruction), use AlignedMemory: 9 // destruction), use AlignedMemory:
10 // 10 //
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27 // AlignedFree(my_array); 27 // AlignedFree(my_array);
28 // 28 //
29 // Or using scoped_ptr: 29 // Or using scoped_ptr:
30 // 30 //
31 // scoped_ptr<float, AlignedFreeDeleter> my_array( 31 // scoped_ptr<float, AlignedFreeDeleter> my_array(
32 // static_cast<float*>(AlignedAlloc(size, alignment))); 32 // static_cast<float*>(AlignedAlloc(size, alignment)));
33 33
34 #ifndef BASE_MEMORY_ALIGNED_MEMORY_H_ 34 #ifndef BASE_MEMORY_ALIGNED_MEMORY_H_
35 #define BASE_MEMORY_ALIGNED_MEMORY_H_ 35 #define BASE_MEMORY_ALIGNED_MEMORY_H_
36 36
37 #include <stddef.h>
38 #include <stdint.h>
39
37 #include "base/base_export.h" 40 #include "base/base_export.h"
38 #include "base/basictypes.h"
39 #include "base/compiler_specific.h" 41 #include "base/compiler_specific.h"
40 42
41 #if defined(COMPILER_MSVC) 43 #if defined(COMPILER_MSVC)
42 #include <malloc.h> 44 #include <malloc.h>
43 #else 45 #else
44 #include <stdlib.h> 46 #include <stdlib.h>
45 #endif 47 #endif
46 48
47 namespace base { 49 namespace base {
48 50
49 // AlignedMemory is specialized for all supported alignments. 51 // AlignedMemory is specialized for all supported alignments.
50 // Make sure we get a compiler error if someone uses an unsupported alignment. 52 // Make sure we get a compiler error if someone uses an unsupported alignment.
51 template <size_t Size, size_t ByteAlignment> 53 template <size_t Size, size_t ByteAlignment>
52 struct AlignedMemory {}; 54 struct AlignedMemory {};
53 55
54 #define BASE_DECL_ALIGNED_MEMORY(byte_alignment) \ 56 #define BASE_DECL_ALIGNED_MEMORY(byte_alignment) \
55 template <size_t Size> \ 57 template <size_t Size> \
56 class AlignedMemory<Size, byte_alignment> { \ 58 class AlignedMemory<Size, byte_alignment> { \
57 public: \ 59 public: \
58 ALIGNAS(byte_alignment) uint8 data_[Size]; \ 60 ALIGNAS(byte_alignment) uint8_t data_[Size]; \
59 void* void_data() { return static_cast<void*>(data_); } \ 61 void* void_data() { return static_cast<void*>(data_); } \
60 const void* void_data() const { \ 62 const void* void_data() const { return static_cast<const void*>(data_); } \
61 return static_cast<const void*>(data_); \ 63 template <typename Type> \
62 } \ 64 Type* data_as() { \
63 template<typename Type> \ 65 return static_cast<Type*>(void_data()); \
64 Type* data_as() { return static_cast<Type*>(void_data()); } \ 66 } \
65 template<typename Type> \ 67 template <typename Type> \
66 const Type* data_as() const { \ 68 const Type* data_as() const { \
67 return static_cast<const Type*>(void_data()); \ 69 return static_cast<const Type*>(void_data()); \
68 } \ 70 } \
69 private: \ 71 \
70 void* operator new(size_t); \ 72 private: \
71 void operator delete(void*); \ 73 void* operator new(size_t); \
72 } 74 void operator delete(void*); \
75 }
73 76
74 // Specialization for all alignments is required because MSVC (as of VS 2008) 77 // Specialization for all alignments is required because MSVC (as of VS 2008)
75 // does not understand ALIGNAS(ALIGNOF(Type)) or ALIGNAS(template_param). 78 // does not understand ALIGNAS(ALIGNOF(Type)) or ALIGNAS(template_param).
76 // Greater than 4096 alignment is not supported by some compilers, so 4096 is 79 // Greater than 4096 alignment is not supported by some compilers, so 4096 is
77 // the maximum specified here. 80 // the maximum specified here.
78 BASE_DECL_ALIGNED_MEMORY(1); 81 BASE_DECL_ALIGNED_MEMORY(1);
79 BASE_DECL_ALIGNED_MEMORY(2); 82 BASE_DECL_ALIGNED_MEMORY(2);
80 BASE_DECL_ALIGNED_MEMORY(4); 83 BASE_DECL_ALIGNED_MEMORY(4);
81 BASE_DECL_ALIGNED_MEMORY(8); 84 BASE_DECL_ALIGNED_MEMORY(8);
82 BASE_DECL_ALIGNED_MEMORY(16); 85 BASE_DECL_ALIGNED_MEMORY(16);
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105 // scoped_ptr<Foo, base::AlignedFreeDeleter> foo; 108 // scoped_ptr<Foo, base::AlignedFreeDeleter> foo;
106 struct AlignedFreeDeleter { 109 struct AlignedFreeDeleter {
107 inline void operator()(void* ptr) const { 110 inline void operator()(void* ptr) const {
108 AlignedFree(ptr); 111 AlignedFree(ptr);
109 } 112 }
110 }; 113 };
111 114
112 } // namespace base 115 } // namespace base
113 116
114 #endif // BASE_MEMORY_ALIGNED_MEMORY_H_ 117 #endif // BASE_MEMORY_ALIGNED_MEMORY_H_
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