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 /* 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 #ifdef HAVE_LONG_DOUBLE
  48 typedef long double DOUBLEST;
  49 #else
  50 typedef double DOUBLEST;
  51 #endif
  52
  53 extern void floatformat_to_doublest (const struct floatformat *,
  54                                      const void *in, DOUBLEST *out);
  55 extern void floatformat_from_doublest (const struct floatformat *,
  56                                        const DOUBLEST *in, void *out);
  57
  58 extern int floatformat_is_negative (const struct floatformat *, char *);
  59 extern int floatformat_is_nan (const struct floatformat *, char *);
  60 extern char *floatformat_mantissa (const struct floatformat *, char *);
  61
  62 /* These two functions are deprecated in favour of
  63    extract_typed_floating and store_typed_floating.  See comments in
  64    'doublest.c' for details.  */
  65
  66 extern DOUBLEST extract_floating (const void *addr, int len);
  67 extern void store_floating (void *addr, int len, DOUBLEST val);
  68
  69 /* Given TYPE, return its floatformat.  TYPE_FLOATFORMAT() may return
  70    NULL.  type_floatformat() detects that and returns a floatformat
  71    based on the type size when FLOATFORMAT is NULL.  */
  72
  73 const struct floatformat *floatformat_from_type (const struct type *type);
  74
  75 extern DOUBLEST extract_typed_floating (const void *addr,
  76                                         const struct type *type);
  77 extern void store_typed_floating (void *addr, const struct type *type,
  78                                   DOUBLEST val);
  79 extern void convert_typed_floating (const void *from,
  80                                     const struct type *from_type,
  81                                     void *to, const struct type *to_type);
  82
  83 #endif