1 /* Floating point definitions for GDB.
3 Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005, 2006
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 2 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, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
30 /* Setup definitions for host and target floating point formats. We need to
31 consider the format for `float', `double', and `long double' for both target
32 and host. We need to do this so that we know what kind of conversions need
33 to be done when converting target numbers to and from the hosts DOUBLEST
36 /* This is used to indicate that we don't know the format of the floating point
37 number. Typically, this is useful for native ports, where the actual format
38 is irrelevant, since no conversions will be taking place. */
40 #include "floatformat.h" /* For struct floatformat */
42 /* Use `long double' if the host compiler supports it. (Note that this is not
43 necessarily any longer than `double'. On SunOS/gcc, it's the same as
44 double.) This is necessary because GDB internally converts all floating
45 point values to the widest type supported by the host.
47 There are problems however, when the target `long double' is longer than the
48 host's `long double'. In general, we'll probably reduce the precision of
49 any such values and print a warning. */
51 #if (defined HAVE_LONG_DOUBLE && defined PRINTF_HAS_LONG_DOUBLE \
52 && defined SCANF_HAS_LONG_DOUBLE)
53 typedef long double DOUBLEST
;
54 # define DOUBLEST_PRINT_FORMAT "%Lg"
55 # define DOUBLEST_SCAN_FORMAT "%Lg"
57 typedef double DOUBLEST
;
58 # define DOUBLEST_PRINT_FORMAT "%g"
59 # define DOUBLEST_SCAN_FORMAT "%lg"
60 /* If we can't scan or print long double, we don't want to use it
62 # undef HAVE_LONG_DOUBLE
63 # undef PRINTF_HAS_LONG_DOUBLE
64 # undef SCANF_HAS_LONG_DOUBLE
67 extern void floatformat_to_doublest (const struct floatformat
*,
68 const void *in
, DOUBLEST
*out
);
69 extern void floatformat_from_doublest (const struct floatformat
*,
70 const DOUBLEST
*in
, void *out
);
72 extern int floatformat_is_negative (const struct floatformat
*,
74 extern int floatformat_is_nan (const struct floatformat
*, const bfd_byte
*);
75 extern const char *floatformat_mantissa (const struct floatformat
*,
78 /* These functions have been replaced by extract_typed_floating and
81 Most calls are passing in TYPE_LENGTH (TYPE) so can be changed to
82 just pass the TYPE. The remainder pass in the length of a
83 register, those calls should instead pass in the floating point
84 type that corresponds to that length. */
86 extern DOUBLEST
deprecated_extract_floating (const void *addr
, int len
);
87 extern void deprecated_store_floating (void *addr
, int len
, DOUBLEST val
);
89 /* Given TYPE, return its floatformat. TYPE_FLOATFORMAT() may return
90 NULL. type_floatformat() detects that and returns a floatformat
91 based on the type size when FLOATFORMAT is NULL. */
93 const struct floatformat
*floatformat_from_type (const struct type
*type
);
95 extern DOUBLEST
extract_typed_floating (const void *addr
,
96 const struct type
*type
);
97 extern void store_typed_floating (void *addr
, const struct type
*type
,
99 extern void convert_typed_floating (const void *from
,
100 const struct type
*from_type
,
101 void *to
, const struct type
*to_type
);
103 /* Table of convenient float-formats. */
104 extern const struct floatformat
*floatformat_ieee_single
[BFD_ENDIAN_UNKNOWN
];
105 extern const struct floatformat
*floatformat_ieee_double
[BFD_ENDIAN_UNKNOWN
];
106 extern const struct floatformat
*floatformat_ieee_quad
[BFD_ENDIAN_UNKNOWN
];
107 extern const struct floatformat
*floatformat_arm_ext
[BFD_ENDIAN_UNKNOWN
];
108 extern const struct floatformat
*floatformat_ia64_spill
[BFD_ENDIAN_UNKNOWN
];
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