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1 /* | 1 /* |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * 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 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
29 */ | 29 */ |
30 | 30 |
31 #ifndef WTF_h | 31 #ifndef WTF_h |
32 #define WTF_h | 32 #define WTF_h |
33 | 33 |
34 #include "wtf/Compiler.h" | 34 #include "wtf/Compiler.h" |
35 #include "wtf/CurrentTime.h" | 35 #include "wtf/CurrentTime.h" |
36 #include "wtf/PartitionAlloc.h" | 36 #include "wtf/PartitionAlloc.h" |
37 #include <limits.h> | |
37 | 38 |
38 namespace WTF { | 39 namespace WTF { |
39 | 40 |
40 // This function must be called exactly once from the main thread before using a nything else in WTF. | 41 // This function must be called exactly once from the main thread before using a nything else in WTF. |
41 WTF_EXPORT void initialize(TimeFunction currentTimeFunction, TimeFunction monoto nicallyIncreasingTimeFunction); | 42 WTF_EXPORT void initialize(TimeFunction currentTimeFunction, TimeFunction monoto nicallyIncreasingTimeFunction); |
42 WTF_EXPORT void shutdown(); | 43 WTF_EXPORT void shutdown(); |
43 | 44 |
44 class Partitions { | 45 class Partitions { |
45 public: | 46 public: |
46 static void initialize(); | 47 static void initialize(); |
47 static void shutdown(); | 48 static void shutdown(); |
48 static ALWAYS_INLINE PartitionRoot* getBufferPartition() { return m_bufferAl locator.root(); } | 49 static ALWAYS_INLINE PartitionRoot* getBufferPartition() { return m_bufferAl locator.root(); } |
49 | 50 |
50 private: | 51 private: |
51 static PartitionAllocator<4096> m_bufferAllocator; | 52 static PartitionAllocator<4096> m_bufferAllocator; |
52 }; | 53 }; |
53 | 54 |
54 | 55 |
56 class QuantizedAllocation { | |
abarth-chromium
2013/09/07 05:08:24
Why is this in WTF.h? Please put it in its own he
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57 public: | |
58 static const size_t kMaxAllocation = 32768; | |
59 static const size_t kMaxRounding = 4096; | |
60 static const size_t kMinRounding = 16; | |
61 static const size_t kMinRoundingLimit = 256; | |
62 static const size_t kTableSize = kMaxAllocation / kMinRoundingLimit; | |
abarth-chromium
2013/09/07 05:08:24
Can you add some comments explaining where these n
| |
63 | |
64 // Using "unsigned" is not a limitation because Chromium's max malloc() is 2 GB even on 64-bit. | |
65 static const size_t kMaxUnquantizedAllocation = UINT_MAX - kMaxRounding; | |
66 | |
67 static void init(); | |
68 | |
69 static size_t quantizedSize(size_t size) | |
70 { | |
71 size_t roundToLessOne; | |
72 if (UNLIKELY(size >= kMaxAllocation)) | |
73 roundToLessOne = kMaxRounding - 1; | |
74 else | |
75 roundToLessOne = table[size / kMinRoundingLimit]; | |
76 return (size + roundToLessOne) & ~roundToLessOne; | |
77 } | |
78 | |
79 private: | |
80 static unsigned short table[kTableSize]; | |
81 }; | |
82 | |
55 } // namespace WTF | 83 } // namespace WTF |
56 | 84 |
57 #endif // WTF_h | 85 #endif // WTF_h |
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