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1 /* | 1 /* |
2 * Copyright (C) 2009 Apple Inc. All rights reserved. | 2 * Copyright (C) 2009 Apple Inc. All rights reserved. |
3 * Copyright (C) 2013 Google Inc. All rights reserved. | 3 * Copyright (C) 2013 Google Inc. All rights reserved. |
4 * | 4 * |
5 * Redistribution and use in source and binary forms, with or without | 5 * Redistribution and use in source and binary forms, with or without |
6 * modification, are permitted provided that the following conditions | 6 * modification, are permitted provided that the following conditions |
7 * are met: | 7 * are met: |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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42 enum InitializationPolicy { | 42 enum InitializationPolicy { |
43 ZeroInitialize, | 43 ZeroInitialize, |
44 DontInitialize | 44 DontInitialize |
45 }; | 45 }; |
46 | 46 |
47 enum SharingType { | 47 enum SharingType { |
48 NotShared, | 48 NotShared, |
49 Shared, | 49 Shared, |
50 }; | 50 }; |
51 | 51 |
| 52 enum OutOfMemoryPolicy { |
| 53 // CrashIfOutOfMemory_DEPRECATED should never be used inside the |
| 54 // scope of a script execution context, and is deprecated for all other |
| 55 // uses. |
| 56 CrashIfOutOfMemory_DEPRECATED, |
| 57 // When using the NullDataIfOutOfMemory policy in the scope of a |
| 58 // script context, a RangeError DOM exception must be thrown |
| 59 // if the ArrayBufferContents' data is null (allocation failed). |
| 60 // Spec: http://ecma-international.org/ecma-262/6.0/#sec-createbytedatab
lock |
| 61 // However, an exception must *not* be thrown if the requested buffer si
ze |
| 62 // was 0 bytes, which also results in a null data pointer. |
| 63 NullDataIfOutOfMemory, |
| 64 }; |
| 65 |
52 ArrayBufferContents(); | 66 ArrayBufferContents(); |
53 ArrayBufferContents(unsigned numElements, unsigned elementByteSize, SharingT
ype isShared, ArrayBufferContents::InitializationPolicy); | 67 ArrayBufferContents(unsigned numElements, unsigned elementByteSize, SharingT
ype isShared, InitializationPolicy, OutOfMemoryPolicy); |
54 | 68 |
55 // Use with care. data must be allocated with allocateMemory. | 69 // Use with care. data must be allocated with allocateMemory. |
56 // ArrayBufferContents will take ownership of the data and free it (using fr
eeMemory) | 70 // ArrayBufferContents will take ownership of the data and free it (using fr
eeMemory) |
57 // upon destruction. | 71 // upon destruction. |
58 // This constructor will not call observer->StartObserving(), so it is a res
ponsibility | 72 // This constructor will not call observer->StartObserving(), so it is a res
ponsibility |
59 // of the caller to make sure JS knows about external memory. | 73 // of the caller to make sure JS knows about external memory. |
60 ArrayBufferContents(void* data, unsigned sizeInBytes, SharingType isShared); | 74 ArrayBufferContents(void* data, unsigned sizeInBytes, SharingType, OutOfMemo
ryPolicy); |
61 | 75 |
62 ~ArrayBufferContents(); | 76 ~ArrayBufferContents(); |
63 | 77 |
64 void neuter(); | 78 void neuter(); |
65 | 79 |
66 void* data() const { return m_holder ? m_holder->data() : nullptr; } | 80 void* data() const { return m_holder ? m_holder->data() : nullptr; } |
67 unsigned sizeInBytes() const { return m_holder ? m_holder->sizeInBytes() : 0
; } | 81 unsigned sizeInBytes() const { return m_holder ? m_holder->sizeInBytes() : 0
; } |
68 bool isShared() const { return m_holder ? m_holder->isShared() : false; } | 82 bool isShared() const { return m_holder ? m_holder->isShared() : false; } |
69 | 83 |
70 void transfer(ArrayBufferContents& other); | 84 void transfer(ArrayBufferContents& other); |
71 void shareWith(ArrayBufferContents& other); | 85 void shareWith(ArrayBufferContents& other); |
72 void copyTo(ArrayBufferContents& other); | 86 void copyTo(ArrayBufferContents& other, OutOfMemoryPolicy); |
73 | 87 |
74 static void allocateMemory(size_t, InitializationPolicy, void*&); | 88 static void deprecatedAllocateMemoryOrCrash(size_t, InitializationPolicy, vo
id*& data); |
| 89 static void allocateMemoryOrNull(size_t, InitializationPolicy, void*& data); |
75 static void freeMemory(void*, size_t); | 90 static void freeMemory(void*, size_t); |
76 static void setAdjustAmoutOfExternalAllocatedMemoryFunction(AdjustAmountOfEx
ternalAllocatedMemoryFunction function) | 91 static void setAdjustAmoutOfExternalAllocatedMemoryFunction(AdjustAmountOfEx
ternalAllocatedMemoryFunction function) |
77 { | 92 { |
78 ASSERT(!s_adjustAmountOfExternalAllocatedMemoryFunction); | 93 ASSERT(!s_adjustAmountOfExternalAllocatedMemoryFunction); |
79 s_adjustAmountOfExternalAllocatedMemoryFunction = function; | 94 s_adjustAmountOfExternalAllocatedMemoryFunction = function; |
80 } | 95 } |
| 96 static void fakeOutOfMemoryForNextArrayBufferAllocationForTesting() |
| 97 { |
| 98 s_fakeAllocationFailureForTestingOneTime = true; |
| 99 } |
81 | 100 |
82 private: | 101 private: |
83 class DataHolder : public ThreadSafeRefCounted<DataHolder> { | 102 class DataHolder : public ThreadSafeRefCounted<DataHolder> { |
84 WTF_MAKE_NONCOPYABLE(DataHolder); | 103 WTF_MAKE_NONCOPYABLE(DataHolder); |
85 public: | 104 public: |
86 DataHolder(); | 105 DataHolder(); |
87 ~DataHolder(); | 106 ~DataHolder(); |
88 | 107 |
89 void allocateNew(unsigned sizeInBytes, SharingType isShared, Initializat
ionPolicy); | 108 void allocateNew(unsigned sizeInBytes, SharingType, InitializationPolicy
, OutOfMemoryPolicy); |
90 void adopt(void* data, unsigned sizeInBytes, SharingType isShared); | 109 void adopt(void* data, unsigned sizeInBytes, SharingType isShared); |
91 void copyMemoryTo(DataHolder& other); | 110 void copyMemoryTo(DataHolder& other, OutOfMemoryPolicy); |
92 | 111 |
93 void* data() const { return m_data; } | 112 void* data() const { return m_data; } |
94 unsigned sizeInBytes() const { return m_sizeInBytes; } | 113 unsigned sizeInBytes() const { return m_sizeInBytes; } |
95 bool isShared() const { return m_isShared == Shared; } | 114 bool isShared() const { return m_isShared == Shared; } |
96 | 115 |
97 private: | 116 private: |
98 void* m_data; | 117 void* m_data; |
99 unsigned m_sizeInBytes; | 118 unsigned m_sizeInBytes; |
100 SharingType m_isShared; | 119 SharingType m_isShared; |
101 }; | 120 }; |
102 | 121 |
103 RefPtr<DataHolder> m_holder; | 122 RefPtr<DataHolder> m_holder; |
104 static AdjustAmountOfExternalAllocatedMemoryFunction s_adjustAmountOfExterna
lAllocatedMemoryFunction; | 123 static AdjustAmountOfExternalAllocatedMemoryFunction s_adjustAmountOfExterna
lAllocatedMemoryFunction; |
| 124 static bool s_fakeAllocationFailureForTestingOneTime; |
105 }; | 125 }; |
106 | 126 |
107 } // namespace WTF | 127 } // namespace WTF |
108 | 128 |
109 #endif // ArrayBufferContents_h | 129 #endif // ArrayBufferContents_h |
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