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/* Decimal floating point support for GDB.
Copyright 2007, 2008 Free Software Foundation, Inc.
This file is part of GDB.
This program 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 of the License, or
(at your option) any later version.
This program 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
/* The order of the following headers is important for making sure
decNumber structure is large enough to hold decimal128 digits. */
#include "dpd/decimal128.h"
#include "dpd/decimal64.h"
#include "dpd/decimal32.h"
/* In GDB, we are using an array of gdb_byte to represent decimal values.
They are stored in host byte order. This routine does the conversion if
the target byte order is different. */
static void
match_endianness (const gdb_byte *from, int len, gdb_byte *to)
{
int i;
#if WORDS_BIGENDIAN
#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_LITTLE
#else
#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_BIG
#endif
if (gdbarch_byte_order (current_gdbarch) == OPPOSITE_BYTE_ORDER)
for (i = 0; i < len; i++)
to[i] = from[len - i - 1];
else
for (i = 0; i < len; i++)
to[i] = from[i];
return;
}
/* Convert decimal type to its string representation. LEN is the length
of the decimal type, 4 bytes for decimal32, 8 bytes for decimal64 and
16 bytes for decimal128. */
void
decimal_to_string (const gdb_byte *decbytes, int len, char *s)
{
gdb_byte dec[16];
match_endianness (decbytes, len, dec);
switch (len)
{
case 4:
decimal32ToString ((decimal32 *) dec, s);
break;
case 8:
decimal64ToString ((decimal64 *) dec, s);
break;
case 16:
decimal128ToString ((decimal128 *) dec, s);
break;
default:
error (_("Unknown decimal floating point type."));
break;
}
}
/* Convert the string form of a decimal value to its decimal representation.
LEN is the length of the decimal type, 4 bytes for decimal32, 8 bytes for
decimal64 and 16 bytes for decimal128. */
int
decimal_from_string (gdb_byte *decbytes, int len, const char *string)
{
decContext set;
gdb_byte dec[16];
switch (len)
{
case 4:
decContextDefault (&set, DEC_INIT_DECIMAL32);
set.traps = 0;
decimal32FromString ((decimal32 *) dec, string, &set);
break;
case 8:
decContextDefault (&set, DEC_INIT_DECIMAL64);
set.traps = 0;
decimal64FromString ((decimal64 *) dec, string, &set);
break;
case 16:
decContextDefault (&set, DEC_INIT_DECIMAL128);
set.traps = 0;
decimal128FromString ((decimal128 *) dec, string, &set);
break;
default:
error (_("Unknown decimal floating point type."));
break;
}
match_endianness (dec, len, decbytes);
return 1;
}
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