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Side by Side Diff: cc/base/hash_pair.h

Issue 13051003: cpplint.py pass on cc/(base|debug|quads|resources)/ (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: fix prioritized_resource_unittest Created 7 years, 9 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 // Defines methods for hashing a pair of integers. 5 // Defines methods for hashing a pair of integers.
6 6
7 #ifndef CC_BASE_HASH_PAIR_H_ 7 #ifndef CC_BASE_HASH_PAIR_H_
8 #define CC_BASE_HASH_PAIR_H_ 8 #define CC_BASE_HASH_PAIR_H_
9 9
10 #include <utility>
11
12 #include "base/basictypes.h"
10 #include "base/hash_tables.h" 13 #include "base/hash_tables.h"
11 14
12 #if defined(COMPILER_MSVC) 15 #if defined(COMPILER_MSVC)
13 16
14 #define DEFINE_PAIR_HASH_FUNCTION_START(type1, type2) \ 17 #define DEFINE_PAIR_HASH_FUNCTION_START(type1, type2) \
15 template<> \ 18 template<> \
16 inline std::size_t hash_value<std::pair<type1, type2> >( \ 19 inline std::size_t hash_value<std::pair<type1, type2> >( \
17 const std::pair<type1, type2>& value) 20 const std::pair<type1, type2>& value)
18 21
19 #define DEFINE_PAIR_HASH_FUNCTION_END() 22 #define DEFINE_PAIR_HASH_FUNCTION_END()
20 23
21 #elif defined(COMPILER_GCC) 24 #elif defined(COMPILER_GCC)
22 25
23 #define DEFINE_PAIR_HASH_FUNCTION_START(type1, type2) \ 26 #define DEFINE_PAIR_HASH_FUNCTION_START(type1, type2) \
24 template<> \ 27 template<> \
25 struct hash<std::pair<type1, type2> > { \ 28 struct hash<std::pair<type1, type2> > { \
26 std::size_t operator()(std::pair<type1, type2> value) const 29 std::size_t operator()(std::pair<type1, type2> value) const
27 30
28 #define DEFINE_PAIR_HASH_FUNCTION_END() \ 31 #define DEFINE_PAIR_HASH_FUNCTION_END() \
29 }; 32 };
30 33
31 #else 34 #else
32 #error define DEFINE_PAIR_HASH_FUNCTION_START for your compiler 35 #error define DEFINE_PAIR_HASH_FUNCTION_START for your compiler
33 #endif // COMPILER 36 #endif // COMPILER
34 37
35 namespace BASE_HASH_NAMESPACE { 38 namespace BASE_HASH_NAMESPACE {
36 39
37 // Implement hashing for pairs of at-most 32 bit integer values. 40 // Implement hashing for pairs of at-most 32 bit integer values.
38 // When size_t is 32 bits, we turn the 64-bit hash code into 32 bits by using 41 // When size_t is 32 bits, we turn the 64-bit hash code into 32 bits by using
39 // multiply-add hashing. This algorithm, as described in 42 // multiply-add hashing. This algorithm, as described in
40 // Theorem 4.3.3 of the thesis "Über die Komplexität der Multiplikation in 43 // Theorem 4.3.3 of the thesis "Über die Komplexität der Multiplikation in
41 // eingeschränkten Branchingprogrammmodellen" by Woelfel, is: 44 // eingeschränkten Branchingprogrammmodellen" by Woelfel, is:
42 // 45 //
43 // h32(x32, y32) = (h64(x32, y32) * rand_odd64 + rand16 * 2^16) % 2^64 / 2^32 46 // h32(x32, y32) = (h64(x32, y32) * rand_odd64 + rand16 * 2^16) % 2^64 / 2^32
(...skipping 10 matching lines...) Expand all
54 uint64 odd_random = 481046412LL << 32 | 1025306954LL; \ 57 uint64 odd_random = 481046412LL << 32 | 1025306954LL; \
55 uint32 shift_random = 10121U << 16; \ 58 uint32 shift_random = 10121U << 16; \
56 \ 59 \
57 hash64 = hash64 * odd_random + shift_random; \ 60 hash64 = hash64 * odd_random + shift_random; \
58 std::size_t high_bits = static_cast<std::size_t>( \ 61 std::size_t high_bits = static_cast<std::size_t>( \
59 hash64 >> (sizeof(uint64) - sizeof(std::size_t))); \ 62 hash64 >> (sizeof(uint64) - sizeof(std::size_t))); \
60 return high_bits; \ 63 return high_bits; \
61 } \ 64 } \
62 DEFINE_PAIR_HASH_FUNCTION_END(); 65 DEFINE_PAIR_HASH_FUNCTION_END();
63 66
64 DEFINE_32BIT_PAIR_HASH(short, short); 67 DEFINE_32BIT_PAIR_HASH(int16, int16);
65 DEFINE_32BIT_PAIR_HASH(short, unsigned short); 68 DEFINE_32BIT_PAIR_HASH(int16, uint16);
66 DEFINE_32BIT_PAIR_HASH(short, int); 69 DEFINE_32BIT_PAIR_HASH(int16, int32);
67 DEFINE_32BIT_PAIR_HASH(short, unsigned); 70 DEFINE_32BIT_PAIR_HASH(int16, uint32);
68 DEFINE_32BIT_PAIR_HASH(unsigned short, short); 71 DEFINE_32BIT_PAIR_HASH(uint16, int16);
69 DEFINE_32BIT_PAIR_HASH(unsigned short, unsigned short); 72 DEFINE_32BIT_PAIR_HASH(uint16, uint16);
70 DEFINE_32BIT_PAIR_HASH(unsigned short, int); 73 DEFINE_32BIT_PAIR_HASH(uint16, int32);
71 DEFINE_32BIT_PAIR_HASH(unsigned short, unsigned); 74 DEFINE_32BIT_PAIR_HASH(uint16, uint32);
72 DEFINE_32BIT_PAIR_HASH(int, short); 75 DEFINE_32BIT_PAIR_HASH(int32, int16);
73 DEFINE_32BIT_PAIR_HASH(int, unsigned short); 76 DEFINE_32BIT_PAIR_HASH(int32, uint16);
74 DEFINE_32BIT_PAIR_HASH(int, int); 77 DEFINE_32BIT_PAIR_HASH(int32, int32);
75 DEFINE_32BIT_PAIR_HASH(int, unsigned); 78 DEFINE_32BIT_PAIR_HASH(int32, uint32);
76 DEFINE_32BIT_PAIR_HASH(unsigned, short); 79 DEFINE_32BIT_PAIR_HASH(uint32, int16);
77 DEFINE_32BIT_PAIR_HASH(unsigned, unsigned short); 80 DEFINE_32BIT_PAIR_HASH(uint32, uint16);
78 DEFINE_32BIT_PAIR_HASH(unsigned, int); 81 DEFINE_32BIT_PAIR_HASH(uint32, int32);
79 DEFINE_32BIT_PAIR_HASH(unsigned, unsigned); 82 DEFINE_32BIT_PAIR_HASH(uint32, uint32);
80 83
81 #undef DEFINE_32BIT_PAIR_HASH 84 #undef DEFINE_32BIT_PAIR_HASH
82 85
83 // Implement hashing for pairs of up-to 64-bit integer values. 86 // Implement hashing for pairs of up-to 64-bit integer values.
84 // We use the compound integer hash method to produce a 64-bit hash code, by 87 // We use the compound integer hash method to produce a 64-bit hash code, by
85 // breaking the two 64-bit inputs into 4 32-bit values: 88 // breaking the two 64-bit inputs into 4 32-bit values:
86 // http://opendatastructures.org/versions/edition-0.1d/ods-java/node33.html#SECT ION00832000000000000000 89 // http://opendatastructures.org/versions/edition-0.1d/ods-java/node33.html#SECT ION00832000000000000000
87 // Then we reduce our result to 32 bits if required, similar to above. 90 // Then we reduce our result to 32 bits if required, similar to above.
88 91
89 #define DEFINE_64BIT_PAIR_HASH(type1, type2) \ 92 #define DEFINE_64BIT_PAIR_HASH(type1, type2) \
(...skipping 23 matching lines...) Expand all
113 uint64 odd_random = 1578233944LL << 32 | 194370989LL; \ 116 uint64 odd_random = 1578233944LL << 32 | 194370989LL; \
114 uint32 shift_random = 20591U << 16; \ 117 uint32 shift_random = 20591U << 16; \
115 \ 118 \
116 hash64 = hash64 * odd_random + shift_random; \ 119 hash64 = hash64 * odd_random + shift_random; \
117 std::size_t high_bits = static_cast<std::size_t>( \ 120 std::size_t high_bits = static_cast<std::size_t>( \
118 hash64 >> (sizeof(uint64) - sizeof(std::size_t))); \ 121 hash64 >> (sizeof(uint64) - sizeof(std::size_t))); \
119 return high_bits; \ 122 return high_bits; \
120 } \ 123 } \
121 DEFINE_PAIR_HASH_FUNCTION_END(); 124 DEFINE_PAIR_HASH_FUNCTION_END();
122 125
123 DEFINE_64BIT_PAIR_HASH(short, int64); 126 DEFINE_64BIT_PAIR_HASH(int16, int64);
124 DEFINE_64BIT_PAIR_HASH(short, uint64); 127 DEFINE_64BIT_PAIR_HASH(int16, uint64);
125 DEFINE_64BIT_PAIR_HASH(unsigned short, int64); 128 DEFINE_64BIT_PAIR_HASH(uint16, int64);
126 DEFINE_64BIT_PAIR_HASH(unsigned short, uint64); 129 DEFINE_64BIT_PAIR_HASH(uint16, uint64);
127 DEFINE_64BIT_PAIR_HASH(int, int64); 130 DEFINE_64BIT_PAIR_HASH(int32, int64);
128 DEFINE_64BIT_PAIR_HASH(int, uint64); 131 DEFINE_64BIT_PAIR_HASH(int32, uint64);
129 DEFINE_64BIT_PAIR_HASH(unsigned, int64); 132 DEFINE_64BIT_PAIR_HASH(uint32, int64);
130 DEFINE_64BIT_PAIR_HASH(unsigned, uint64); 133 DEFINE_64BIT_PAIR_HASH(uint32, uint64);
131 DEFINE_64BIT_PAIR_HASH(int64, short); 134 DEFINE_64BIT_PAIR_HASH(int64, int16);
132 DEFINE_64BIT_PAIR_HASH(int64, unsigned short); 135 DEFINE_64BIT_PAIR_HASH(int64, uint16);
133 DEFINE_64BIT_PAIR_HASH(int64, int); 136 DEFINE_64BIT_PAIR_HASH(int64, int32);
134 DEFINE_64BIT_PAIR_HASH(int64, unsigned); 137 DEFINE_64BIT_PAIR_HASH(int64, uint32);
135 DEFINE_64BIT_PAIR_HASH(int64, int64); 138 DEFINE_64BIT_PAIR_HASH(int64, int64);
136 DEFINE_64BIT_PAIR_HASH(int64, uint64); 139 DEFINE_64BIT_PAIR_HASH(int64, uint64);
137 DEFINE_64BIT_PAIR_HASH(uint64, short); 140 DEFINE_64BIT_PAIR_HASH(uint64, int16);
138 DEFINE_64BIT_PAIR_HASH(uint64, unsigned short); 141 DEFINE_64BIT_PAIR_HASH(uint64, uint16);
139 DEFINE_64BIT_PAIR_HASH(uint64, int); 142 DEFINE_64BIT_PAIR_HASH(uint64, int32);
140 DEFINE_64BIT_PAIR_HASH(uint64, unsigned); 143 DEFINE_64BIT_PAIR_HASH(uint64, uint32);
141 DEFINE_64BIT_PAIR_HASH(uint64, int64); 144 DEFINE_64BIT_PAIR_HASH(uint64, int64);
142 DEFINE_64BIT_PAIR_HASH(uint64, uint64); 145 DEFINE_64BIT_PAIR_HASH(uint64, uint64);
143 146
144 #undef DEFINE_64BIT_PAIR_HASH 147 #undef DEFINE_64BIT_PAIR_HASH
145 } 148 }
146 149
147 #undef DEFINE_PAIR_HASH_FUNCTION_START 150 #undef DEFINE_PAIR_HASH_FUNCTION_START
148 #undef DEFINE_PAIR_HASH_FUNCTION_END 151 #undef DEFINE_PAIR_HASH_FUNCTION_END
149 152
150 #endif // CC_BASE_HASH_PAIR_H_ 153 #endif // CC_BASE_HASH_PAIR_H_
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