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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
|
/* CGEN generic opcode support.
Copyright (C) 2002-2016 Free Software Foundation, Inc.
This file is part of libopcodes.
This library 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.
It 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
/* Functions for manipulating CGEN_BITSET. */
#include "libiberty.h"
#include "cgen/bitset.h"
#include <string.h>
/* Create a bit mask. */
CGEN_BITSET *
cgen_bitset_create (unsigned bit_count)
{
CGEN_BITSET * mask = xmalloc (sizeof (* mask));
cgen_bitset_init (mask, bit_count);
return mask;
}
/* Initialize an existing bit mask. */
void
cgen_bitset_init (CGEN_BITSET * mask, unsigned bit_count)
{
if (! mask)
return;
mask->length = (bit_count / 8) + 1;
mask->bits = xmalloc (mask->length);
cgen_bitset_clear (mask);
}
/* Clear the bits of a bit mask. */
void
cgen_bitset_clear (CGEN_BITSET * mask)
{
unsigned i;
if (! mask)
return;
for (i = 0; i < mask->length; ++i)
mask->bits[i] = 0;
}
/* Add a bit to a bit mask. */
void
cgen_bitset_add (CGEN_BITSET * mask, unsigned bit_num)
{
int byte_ix, bit_ix;
int bit_mask;
if (! mask)
return;
byte_ix = bit_num / 8;
bit_ix = bit_num % 8;
bit_mask = 1 << (7 - bit_ix);
mask->bits[byte_ix] |= bit_mask;
}
/* Set a bit mask. */
void
cgen_bitset_set (CGEN_BITSET * mask, unsigned bit_num)
{
if (! mask)
return;
cgen_bitset_clear (mask);
cgen_bitset_add (mask, bit_num);
}
/* Test for a bit in a bit mask.
Returns 1 if the bit is found */
int
cgen_bitset_contains (CGEN_BITSET * mask, unsigned bit_num)
{
int byte_ix, bit_ix;
int bit_mask;
if (! mask)
return 1; /* No bit restrictions. */
byte_ix = bit_num / 8;
bit_ix = 7 - (bit_num % 8);
bit_mask = 1 << bit_ix;
return (mask->bits[byte_ix] & bit_mask) >> bit_ix;
}
/* Compare two bit masks for equality.
Returns 0 if they are equal. */
int
cgen_bitset_compare (CGEN_BITSET * mask1, CGEN_BITSET * mask2)
{
if (mask1 == mask2)
return 0;
if (! mask1 || ! mask2)
return 1;
if (mask1->length != mask2->length)
return 1;
return memcmp (mask1->bits, mask2->bits, mask1->length);
}
/* Test two bit masks for common bits.
Returns 1 if a common bit is found. */
int
cgen_bitset_intersect_p (CGEN_BITSET * mask1, CGEN_BITSET * mask2)
{
unsigned i, limit;
if (mask1 == mask2)
return 1;
if (! mask1 || ! mask2)
return 0;
limit = mask1->length < mask2->length ? mask1->length : mask2->length;
for (i = 0; i < limit; ++i)
if ((mask1->bits[i] & mask2->bits[i]))
return 1;
return 0;
}
/* Make a copy of a bit mask. */
CGEN_BITSET *
cgen_bitset_copy (CGEN_BITSET * mask)
{
CGEN_BITSET* newmask;
if (! mask)
return NULL;
newmask = cgen_bitset_create ((mask->length * 8) - 1);
memcpy (newmask->bits, mask->bits, mask->length);
return newmask;
}
/* Combine two bit masks. */
void
cgen_bitset_union (CGEN_BITSET * mask1, CGEN_BITSET * mask2,
CGEN_BITSET * result)
{
unsigned i;
if (! mask1 || ! mask2 || ! result
|| mask1->length != mask2->length
|| mask1->length != result->length)
return;
for (i = 0; i < result->length; ++i)
result->bits[i] = mask1->bits[i] | mask2->bits[i];
}
|