1 /* Floating point definitions for GDB.
3 Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
4 1997, 1998, 1999, 2000, 2001, 2003, 2005, 2006, 2007, 2008
5 Free Software Foundation, Inc.
7 This file is part of GDB.
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.
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.
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/>. */
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
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. */
38 #include "floatformat.h" /* For struct floatformat */
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.
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. */
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"
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
60 # undef HAVE_LONG_DOUBLE
61 # undef PRINTF_HAS_LONG_DOUBLE
62 # undef SCANF_HAS_LONG_DOUBLE
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). */
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
);
81 extern int floatformat_is_negative (const struct floatformat
*,
83 extern enum float_kind
floatformat_classify (const struct floatformat
*,
85 extern const char *floatformat_mantissa (const struct floatformat
*,
88 /* These functions have been replaced by extract_typed_floating and
91 Most calls are passing in TYPE_LENGTH (TYPE) so can be changed to
92 just pass the TYPE. The remainder pass in the length of a
93 register, those calls should instead pass in the floating point
94 type that corresponds to that length. */
96 extern DOUBLEST
deprecated_extract_floating (const void *addr
, int len
);
97 extern void deprecated_store_floating (void *addr
, int len
, DOUBLEST val
);
99 /* Given TYPE, return its floatformat. TYPE_FLOATFORMAT() may return
100 NULL. type_floatformat() detects that and returns a floatformat
101 based on the type size when FLOATFORMAT is NULL. */
103 const struct floatformat
*floatformat_from_type (const struct type
*type
);
105 extern DOUBLEST
extract_typed_floating (const void *addr
,
106 const struct type
*type
);
107 extern void store_typed_floating (void *addr
, const struct type
*type
,
109 extern void convert_typed_floating (const void *from
,
110 const struct type
*from_type
,
111 void *to
, const struct type
*to_type
);
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