1 /* Floating point definitions for GDB. 2 3 Copyright (C) 1986-2013 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 #ifndef DOUBLEST_H 21 #define DOUBLEST_H 22 23 struct type; 24 struct floatformat; 25 26 /* Setup definitions for host and target floating point formats. We need to 27 consider the format for `float', `double', and `long double' for both target 28 and host. We need to do this so that we know what kind of conversions need 29 to be done when converting target numbers to and from the hosts DOUBLEST 30 data type. */ 31 32 /* This is used to indicate that we don't know the format of the floating point 33 number. Typically, this is useful for native ports, where the actual format 34 is irrelevant, since no conversions will be taking place. */ 35 36 #include "floatformat.h" /* For struct floatformat */ 37 38 /* Use `long double' if the host compiler supports it. (Note that this is not 39 necessarily any longer than `double'. On SunOS/gcc, it's the same as 40 double.) This is necessary because GDB internally converts all floating 41 point values to the widest type supported by the host. 42 43 There are problems however, when the target `long double' is longer than the 44 host's `long double'. In general, we'll probably reduce the precision of 45 any such values and print a warning. */ 46 47 #if (defined HAVE_LONG_DOUBLE && defined PRINTF_HAS_LONG_DOUBLE \ 48 && defined SCANF_HAS_LONG_DOUBLE) 49 typedef long double DOUBLEST; 50 # define DOUBLEST_PRINT_FORMAT "Lg" 51 # define DOUBLEST_SCAN_FORMAT "Lg" 52 #else 53 typedef double DOUBLEST; 54 # define DOUBLEST_PRINT_FORMAT "g" 55 # define DOUBLEST_SCAN_FORMAT "lg" 56 /* If we can't scan or print long double, we don't want to use it 57 anywhere. */ 58 # undef HAVE_LONG_DOUBLE 59 # undef PRINTF_HAS_LONG_DOUBLE 60 # undef SCANF_HAS_LONG_DOUBLE 61 #endif 62 63 /* Different kinds of floatformat numbers recognized by 64 floatformat_classify. To avoid portability issues, we use local 65 values instead of the C99 macros (FP_NAN et cetera). */ 66 enum float_kind { 67 float_nan, 68 float_infinite, 69 float_zero, 70 float_normal, 71 float_subnormal 72 }; 73 74 extern void floatformat_to_doublest (const struct floatformat *, 75 const void *in, DOUBLEST *out); 76 extern void floatformat_from_doublest (const struct floatformat *, 77 const DOUBLEST *in, void *out); 78 79 extern int floatformat_is_negative (const struct floatformat *, 80 const bfd_byte *); 81 extern enum float_kind floatformat_classify (const struct floatformat *, 82 const bfd_byte *); 83 extern const char *floatformat_mantissa (const struct floatformat *, 84 const bfd_byte *); 85 86 /* Given TYPE, return its floatformat. TYPE_FLOATFORMAT() may return 87 NULL. type_floatformat() detects that and returns a floatformat 88 based on the type size when FLOATFORMAT is NULL. */ 89 90 const struct floatformat *floatformat_from_type (const struct type *type); 91 92 extern DOUBLEST extract_typed_floating (const void *addr, 93 const struct type *type); 94 extern void store_typed_floating (void *addr, const struct type *type, 95 DOUBLEST val); 96 extern void convert_typed_floating (const void *from, 97 const struct type *from_type, 98 void *to, const struct type *to_type); 99 100 #endif 101