gdb/doublest.h

   1 /* Floating point definitions for GDB.
   2    Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   3    1997, 1998, 1999, 2000, 2001
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #ifndef DOUBLEST_H
  24 #define DOUBLEST_H
  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 extern const struct floatformat floatformat_unknown;
  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 #ifdef HAVE_LONG_DOUBLE
  50 typedef long double DOUBLEST;
  51 #else
  52 typedef double DOUBLEST;
  53 #endif
  54
  55 extern void floatformat_to_doublest (const struct floatformat *,
  56                                      const void *in, DOUBLEST *out);
  57 extern void floatformat_from_doublest (const struct floatformat *,
  58                                        const DOUBLEST *in, void *out);
  59
  60 extern int floatformat_is_negative (const struct floatformat *, char *);
  61 extern int floatformat_is_nan (const struct floatformat *, char *);
  62 extern char *floatformat_mantissa (const struct floatformat *, char *);
  63
  64 /* Use extract_typed_float() and store_typed_float(). */
  65 extern DOUBLEST extract_floating (const void *in, int); /* DEPRECATED */
  66 extern void store_floating (void *, int, DOUBLEST); /* DEPRECATED */
  67
  68 extern DOUBLEST extract_typed_floating (const void *addr,
  69                                         const struct type *type);
  70 extern void store_typed_floating (void *addr, const struct type *type,
  71                                   DOUBLEST val);
  72
  73 #endif