1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/* An incremental hash abstract data type.
Copyright (C) 2014-2015 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef INCHASH_H
#define INCHASH_H 1
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "hashtab.h"
/* This file implements an incremential hash function ADT, to be used
by code that incrementially hashes a lot of unrelated data
(not in a single memory block) into a single value. The goal
is to make it easy to plug in efficient hash algorithms.
Currently it just implements the plain old jhash based
incremental hash from gcc's tree.c. */
extern hashval_t iterative_hash_host_wide_int (HOST_WIDE_INT, hashval_t);
extern hashval_t iterative_hash_hashval_t (hashval_t, hashval_t);
namespace inchash
{
class hash
{
public:
/* Start incremential hashing, optionally with SEED. */
hash (hashval_t seed = 0)
{
val = seed;
bits = 0;
}
/* End incremential hashing and provide the final value. */
hashval_t end ()
{
return val;
}
/* Add unsigned value V. */
void add_int (unsigned v)
{
val = iterative_hash_hashval_t (v, val);
}
/* Add HOST_WIDE_INT value V. */
void add_wide_int (HOST_WIDE_INT v)
{
val = iterative_hash_host_wide_int (v, val);
}
/* Hash in pointer PTR. */
void add_ptr (void *ptr)
{
add (&ptr, sizeof (ptr));
}
/* Add a memory block DATA with size LEN. */
void add (const void *data, size_t len)
{
val = iterative_hash (data, len, val);
}
/* Merge hash value OTHER. */
void merge_hash (hashval_t other)
{
val = iterative_hash_hashval_t (other, val);
}
/* Hash in state from other inchash OTHER. */
void merge (hash &other)
{
merge_hash (other.val);
}
template<class T> void add_object(T &obj)
{
add (&obj, sizeof(T));
}
/* Support for accumulating boolean flags */
void add_flag (bool flag)
{
bits = (bits << 1) | flag;
}
void commit_flag ()
{
add_int (bits);
bits = 0;
}
/* Support for commutative hashing. Add A and B in a defined order
based on their value. This is useful for hashing commutative
expressions, so that A+B and B+A get the same hash. */
void add_commutative (hash &a, hash &b)
{
if (a.end() > b.end())
{
merge (b);
merge (a);
}
else
{
merge (a);
merge (b);
}
}
private:
hashval_t val;
unsigned bits;
};
}
#endif
|
