9b913628cf
Thiago Jung Bauermann <bauerman@br.ibm.com> * Makefile.in (LIBDECNUMBER_DIR, LIBDECNUMBER, LIBDECNUMBER_SRC LIBDECNUMBER_CFLAGS): New macros for libdecnumber. (INTERNAL_CFLAGS_BASE): Add LIBDECNUMBER_CFLAGS in. (INSTALLED_LIBS): Add -ldecnumber in. (CLIBS): Add LIBDECNUMBER in. (decimal128_h, decimal64_h, decimal32_h): New macros for decimal headers. (dfp_h): New macros for decimal floating point. (dfp.o): New target. (COMMON_OBS): Add dfp.o in. (c-exp.o): Add dfp_h as dependency. (valprint.o): Add dfp_h as dependency. (value.o): Add dfp_h as dependency. * dfp.h: New header file for decimal floating point support in GDB. * dfp.c: New source file for decimal floating point support in GDB. Implement decimal_from_string and decimal_to_string based on libdecnumber API. * configure.ac: Add AC_C_BIGENDIAN test. * config.in, configure: Regenerate.
113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
/* Decimal floating point support for GDB.
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Copyright 2007 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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/* The order of the following headers is important for making sure
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decNumber structure is large enough to hold decimal128 digits. */
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#include "dpd/decimal128.h"
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#include "dpd/decimal64.h"
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#include "dpd/decimal32.h"
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/* In GDB, we are using an array of gdb_byte to represent decimal values.
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They are stored in host byte order. This routine does the conversion if
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the target byte order is different. */
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static void
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match_endianness (const gdb_byte *from, int len, gdb_byte *to)
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{
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int i;
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#if WORDS_BIGENDIAN
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#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_LITTLE
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#else
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#define OPPOSITE_BYTE_ORDER BFD_ENDIAN_BIG
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#endif
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if (gdbarch_byte_order (current_gdbarch) == OPPOSITE_BYTE_ORDER)
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for (i = 0; i < len; i++)
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to[i] = from[len - i - 1];
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else
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for (i = 0; i < len; i++)
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to[i] = from[i];
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return;
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}
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/* Convert decimal type to its string representation. LEN is the length
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of the decimal type, 4 bytes for decimal32, 8 bytes for decimal64 and
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16 bytes for decimal128. */
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void
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decimal_to_string (const gdb_byte *decbytes, int len, char *s)
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{
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gdb_byte dec[16];
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match_endianness (decbytes, len, dec);
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switch (len)
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{
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case 4:
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decimal32ToString ((decimal32 *) dec, s);
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break;
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case 8:
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decimal64ToString ((decimal64 *) dec, s);
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break;
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case 16:
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decimal128ToString ((decimal128 *) dec, s);
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break;
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default:
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error (_("Unknown decimal floating point type.\n"));
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break;
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}
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}
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/* Convert the string form of a decimal value to its decimal representation.
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LEN is the length of the decimal type, 4 bytes for decimal32, 8 bytes for
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decimal64 and 16 bytes for decimal128. */
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int
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decimal_from_string (gdb_byte *decbytes, int len, const char *string)
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{
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decContext set;
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gdb_byte dec[16];
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switch (len)
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{
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case 4:
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decContextDefault (&set, DEC_INIT_DECIMAL32);
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set.traps = 0;
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decimal32FromString ((decimal32 *) dec, string, &set);
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break;
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case 8:
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decContextDefault (&set, DEC_INIT_DECIMAL64);
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set.traps = 0;
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decimal64FromString ((decimal64 *) dec, string, &set);
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break;
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case 16:
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decContextDefault (&set, DEC_INIT_DECIMAL128);
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set.traps = 0;
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decimal128FromString ((decimal128 *) dec, string, &set);
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break;
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default:
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error (_("Unknown decimal floating point type.\n"));
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break;
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}
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match_endianness (dec, len, decbytes);
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return 1;
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}
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