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 #if HOST_BYTE_ORDER == BIG_ENDIAN
  41 #ifndef HOST_FLOAT_FORMAT
  42 #define HOST_FLOAT_FORMAT &floatformat_ieee_single_big
  43 #endif
  44 #ifndef HOST_DOUBLE_FORMAT
  45 #define HOST_DOUBLE_FORMAT &floatformat_ieee_double_big
  46 #endif
  47 #else /* LITTLE_ENDIAN */
  48 #ifndef HOST_FLOAT_FORMAT
  49 #define HOST_FLOAT_FORMAT &floatformat_ieee_single_little
  50 #endif
  51 #ifndef HOST_DOUBLE_FORMAT
  52 #define HOST_DOUBLE_FORMAT &floatformat_ieee_double_little
  53 #endif
  54 #endif
  55
  56 #ifndef HOST_LONG_DOUBLE_FORMAT
  57 #define HOST_LONG_DOUBLE_FORMAT &floatformat_unknown
  58 #endif
  59
  60 /* Use `long double' if the host compiler supports it.  (Note that this is not
  61    necessarily any longer than `double'.  On SunOS/gcc, it's the same as
  62    double.)  This is necessary because GDB internally converts all floating
  63    point values to the widest type supported by the host.
  64
  65    There are problems however, when the target `long double' is longer than the
  66    host's `long double'.  In general, we'll probably reduce the precision of
  67    any such values and print a warning.  */
  68
  69 #ifdef HAVE_LONG_DOUBLE
  70 typedef long double DOUBLEST;
  71 #else
  72 typedef double DOUBLEST;
  73 #endif
  74
  75 extern void floatformat_to_doublest (const struct floatformat *,
  76                                      char *, DOUBLEST *);
  77 extern void floatformat_from_doublest (const struct floatformat *,
  78                                        DOUBLEST *, char *);
  79
  80 extern int floatformat_is_negative (const struct floatformat *, char *);
  81 extern int floatformat_is_nan (const struct floatformat *, char *);
  82 extern char *floatformat_mantissa (const struct floatformat *, char *);
  83
  84 extern DOUBLEST extract_floating (void *, int);
  85 extern void store_floating (void *, int, DOUBLEST);
  86
  87 #endif