gdb/doublest.h

   1 /* Floating point definitions for GDB.
   2
   3    Copyright (C) 1986-2017 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 /* Use `long double' if the host compiler supports it.  (Note that this is not
  27    necessarily any longer than `double'.  On SunOS/gcc, it's the same as
  28    double.)  This is necessary because GDB internally converts all floating
  29    point values to the widest type supported by the host.
  30
  31    There are problems however, when the target `long double' is longer than the
  32    host's `long double'.  In general, we'll probably reduce the precision of
  33    any such values and print a warning.  */
  34
  35 #if (defined HAVE_LONG_DOUBLE && defined PRINTF_HAS_LONG_DOUBLE \
  36      && defined SCANF_HAS_LONG_DOUBLE)
  37 typedef long double DOUBLEST;
  38 # define DOUBLEST_PRINT_FORMAT "Lg"
  39 # define DOUBLEST_SCAN_FORMAT "Lg"
  40 #else
  41 typedef double DOUBLEST;
  42 # define DOUBLEST_PRINT_FORMAT "g"
  43 # define DOUBLEST_SCAN_FORMAT "lg"
  44 /* If we can't scan or print long double, we don't want to use it
  45    anywhere.  */
  46 # undef HAVE_LONG_DOUBLE
  47 # undef PRINTF_HAS_LONG_DOUBLE
  48 # undef SCANF_HAS_LONG_DOUBLE
  49 #endif
  50
  51 /* Different kinds of floatformat numbers recognized by
  52    floatformat_classify.  To avoid portability issues, we use local
  53    values instead of the C99 macros (FP_NAN et cetera).  */
  54 enum float_kind {
  55   float_nan,
  56   float_infinite,
  57   float_zero,
  58   float_normal,
  59   float_subnormal
  60 };
  61
  62 extern void floatformat_to_doublest (const struct floatformat *,
  63                                      const void *in, DOUBLEST *out);
  64 extern void floatformat_from_doublest (const struct floatformat *,
  65                                        const DOUBLEST *in, void *out);
  66
  67 extern int floatformat_is_negative (const struct floatformat *,
  68                                     const bfd_byte *);
  69 extern enum float_kind floatformat_classify (const struct floatformat *,
  70                                              const bfd_byte *);
  71 extern const char *floatformat_mantissa (const struct floatformat *,
  72                                          const bfd_byte *);
  73
  74 extern std::string floatformat_to_string (const struct floatformat *fmt,
  75                                           const gdb_byte *in,
  76                                           const char *format = nullptr);
  77
  78 /* Return the floatformat's total size in host bytes.  */
  79
  80 extern size_t floatformat_totalsize_bytes (const struct floatformat *fmt);
  81
  82 extern DOUBLEST extract_typed_floating (const void *addr,
  83                                         const struct type *type);
  84 extern void store_typed_floating (void *addr, const struct type *type,
  85                                   DOUBLEST val);
  86 extern void convert_typed_floating (const void *from,
  87                                     const struct type *from_type,
  88                                     void *to, const struct type *to_type);
  89
  90 #endif