| 1 | /* Decimal floating point support for GDB. |
| 2 | |
| 3 | Copyright 2007 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | |
| 22 | /* The order of the following headers is important for making sure |
| 23 | decNumber structure is large enough to hold decimal128 digits. */ |
| 24 | |
| 25 | #include "dpd/decimal128.h" |
| 26 | #include "dpd/decimal64.h" |
| 27 | #include "dpd/decimal32.h" |
| 28 | |
| 29 | /* In GDB, we are using an array of gdb_byte to represent decimal values. |
| 30 | They are stored in host byte order. This routine does the conversion if |
| 31 | the target byte order is different. */ |
| 32 | static void |
| 33 | match_endianness (const gdb_byte *from, int len, gdb_byte *to) |
| 34 | { |
| 35 | int i; |
| 36 | |
| 37 | #if WORDS_BIGENDIAN |
| 38 | #define OPPOSITE_BYTE_ORDER BFD_ENDIAN_LITTLE |
| 39 | #else |
| 40 | #define OPPOSITE_BYTE_ORDER BFD_ENDIAN_BIG |
| 41 | #endif |
| 42 | |
| 43 | if (gdbarch_byte_order (current_gdbarch) == OPPOSITE_BYTE_ORDER) |
| 44 | for (i = 0; i < len; i++) |
| 45 | to[i] = from[len - i - 1]; |
| 46 | else |
| 47 | for (i = 0; i < len; i++) |
| 48 | to[i] = from[i]; |
| 49 | |
| 50 | return; |
| 51 | } |
| 52 | |
| 53 | /* Convert decimal type to its string representation. LEN is the length |
| 54 | of the decimal type, 4 bytes for decimal32, 8 bytes for decimal64 and |
| 55 | 16 bytes for decimal128. */ |
| 56 | void |
| 57 | decimal_to_string (const gdb_byte *decbytes, int len, char *s) |
| 58 | { |
| 59 | gdb_byte dec[16]; |
| 60 | |
| 61 | match_endianness (decbytes, len, dec); |
| 62 | switch (len) |
| 63 | { |
| 64 | case 4: |
| 65 | decimal32ToString ((decimal32 *) dec, s); |
| 66 | break; |
| 67 | case 8: |
| 68 | decimal64ToString ((decimal64 *) dec, s); |
| 69 | break; |
| 70 | case 16: |
| 71 | decimal128ToString ((decimal128 *) dec, s); |
| 72 | break; |
| 73 | default: |
| 74 | error (_("Unknown decimal floating point type.\n")); |
| 75 | break; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | /* Convert the string form of a decimal value to its decimal representation. |
| 80 | LEN is the length of the decimal type, 4 bytes for decimal32, 8 bytes for |
| 81 | decimal64 and 16 bytes for decimal128. */ |
| 82 | int |
| 83 | decimal_from_string (gdb_byte *decbytes, int len, const char *string) |
| 84 | { |
| 85 | decContext set; |
| 86 | gdb_byte dec[16]; |
| 87 | |
| 88 | switch (len) |
| 89 | { |
| 90 | case 4: |
| 91 | decContextDefault (&set, DEC_INIT_DECIMAL32); |
| 92 | set.traps = 0; |
| 93 | decimal32FromString ((decimal32 *) dec, string, &set); |
| 94 | break; |
| 95 | case 8: |
| 96 | decContextDefault (&set, DEC_INIT_DECIMAL64); |
| 97 | set.traps = 0; |
| 98 | decimal64FromString ((decimal64 *) dec, string, &set); |
| 99 | break; |
| 100 | case 16: |
| 101 | decContextDefault (&set, DEC_INIT_DECIMAL128); |
| 102 | set.traps = 0; |
| 103 | decimal128FromString ((decimal128 *) dec, string, &set); |
| 104 | break; |
| 105 | default: |
| 106 | error (_("Unknown decimal floating point type.\n")); |
| 107 | break; |
| 108 | } |
| 109 | |
| 110 | match_endianness (dec, len, decbytes); |
| 111 | |
| 112 | return 1; |
| 113 | } |