mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:51:15 +08:00
173 lines
3.7 KiB
C
173 lines
3.7 KiB
C
/* CGEN generic opcode support.
|
|
Copyright 2002, 2005, 2007
|
|
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 "opcode/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];
|
|
}
|