1 /* Floating point definitions for GDB. 2 3 Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 4 1997, 1998, 1999, 2000, 2001, 2003, 2005, 2006, 2007, 2008, 2009 5 Free Software Foundation, Inc. 6 7 This file is part of GDB. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 21 22 #ifndef DOUBLEST_H 23 #define DOUBLEST_H 24 25 struct type; 26 struct floatformat; 27 28 /* Setup definitions for host and target floating point formats. We need to 29 consider the format for `float', `double', and `long double' for both target 30 and host. We need to do this so that we know what kind of conversions need 31 to be done when converting target numbers to and from the hosts DOUBLEST 32 data type. */ 33 34 /* This is used to indicate that we don't know the format of the floating point 35 number. Typically, this is useful for native ports, where the actual format 36 is irrelevant, since no conversions will be taking place. */ 37 38 #include "floatformat.h" /* For struct floatformat */ 39 40 /* Use `long double' if the host compiler supports it. (Note that this is not 41 necessarily any longer than `double'. On SunOS/gcc, it's the same as 42 double.) This is necessary because GDB internally converts all floating 43 point values to the widest type supported by the host. 44 45 There are problems however, when the target `long double' is longer than the 46 host's `long double'. In general, we'll probably reduce the precision of 47 any such values and print a warning. */ 48 49 #if (defined HAVE_LONG_DOUBLE && defined PRINTF_HAS_LONG_DOUBLE \ 50 && defined SCANF_HAS_LONG_DOUBLE) 51 typedef long double DOUBLEST; 52 # define DOUBLEST_PRINT_FORMAT "Lg" 53 # define DOUBLEST_SCAN_FORMAT "Lg" 54 #else 55 typedef double DOUBLEST; 56 # define DOUBLEST_PRINT_FORMAT "g" 57 # define DOUBLEST_SCAN_FORMAT "lg" 58 /* If we can't scan or print long double, we don't want to use it 59 anywhere. */ 60 # undef HAVE_LONG_DOUBLE 61 # undef PRINTF_HAS_LONG_DOUBLE 62 # undef SCANF_HAS_LONG_DOUBLE 63 #endif 64 65 /* Different kinds of floatformat numbers recognized by 66 floatformat_classify. To avoid portability issues, we use local 67 values instead of the C99 macros (FP_NAN et cetera). */ 68 enum float_kind { 69 float_nan, 70 float_infinite, 71 float_zero, 72 float_normal, 73 float_subnormal 74 }; 75 76 extern void floatformat_to_doublest (const struct floatformat *, 77 const void *in, DOUBLEST *out); 78 extern void floatformat_from_doublest (const struct floatformat *, 79 const DOUBLEST *in, void *out); 80 81 extern int floatformat_is_negative (const struct floatformat *, 82 const bfd_byte *); 83 extern enum float_kind floatformat_classify (const struct floatformat *, 84 const bfd_byte *); 85 extern const char *floatformat_mantissa (const struct floatformat *, 86 const bfd_byte *); 87 88 /* Given TYPE, return its floatformat. TYPE_FLOATFORMAT() may return 89 NULL. type_floatformat() detects that and returns a floatformat 90 based on the type size when FLOATFORMAT is NULL. */ 91 92 const struct floatformat *floatformat_from_type (const struct type *type); 93 94 extern DOUBLEST extract_typed_floating (const void *addr, 95 const struct type *type); 96 extern void store_typed_floating (void *addr, const struct type *type, 97 DOUBLEST val); 98 extern void convert_typed_floating (const void *from, 99 const struct type *from_type, 100 void *to, const struct type *to_type); 101 102 #endif 103