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105 lines
3.9 KiB
C
105 lines
3.9 KiB
C
/* Floating point definitions for GDB.
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Copyright (C) 1986-2017 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef DOUBLEST_H
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#define DOUBLEST_H
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struct type;
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struct floatformat;
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/* Setup definitions for host and target floating point formats. We need to
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consider the format for `float', `double', and `long double' for both target
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and host. We need to do this so that we know what kind of conversions need
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to be done when converting target numbers to and from the hosts DOUBLEST
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data type. */
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/* This is used to indicate that we don't know the format of the floating point
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number. Typically, this is useful for native ports, where the actual format
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is irrelevant, since no conversions will be taking place. */
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#include "floatformat.h" /* For struct floatformat */
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/* Use `long double' if the host compiler supports it. (Note that this is not
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necessarily any longer than `double'. On SunOS/gcc, it's the same as
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double.) This is necessary because GDB internally converts all floating
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point values to the widest type supported by the host.
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There are problems however, when the target `long double' is longer than the
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host's `long double'. In general, we'll probably reduce the precision of
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any such values and print a warning. */
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#if (defined HAVE_LONG_DOUBLE && defined PRINTF_HAS_LONG_DOUBLE \
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&& defined SCANF_HAS_LONG_DOUBLE)
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typedef long double DOUBLEST;
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# define DOUBLEST_PRINT_FORMAT "Lg"
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# define DOUBLEST_SCAN_FORMAT "Lg"
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#else
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typedef double DOUBLEST;
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# define DOUBLEST_PRINT_FORMAT "g"
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# define DOUBLEST_SCAN_FORMAT "lg"
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/* If we can't scan or print long double, we don't want to use it
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anywhere. */
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# undef HAVE_LONG_DOUBLE
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# undef PRINTF_HAS_LONG_DOUBLE
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# undef SCANF_HAS_LONG_DOUBLE
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#endif
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/* Different kinds of floatformat numbers recognized by
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floatformat_classify. To avoid portability issues, we use local
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values instead of the C99 macros (FP_NAN et cetera). */
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enum float_kind {
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float_nan,
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float_infinite,
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float_zero,
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float_normal,
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float_subnormal
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};
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extern void floatformat_to_doublest (const struct floatformat *,
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const void *in, DOUBLEST *out);
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extern void floatformat_from_doublest (const struct floatformat *,
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const DOUBLEST *in, void *out);
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extern int floatformat_is_negative (const struct floatformat *,
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const bfd_byte *);
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extern enum float_kind floatformat_classify (const struct floatformat *,
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const bfd_byte *);
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extern const char *floatformat_mantissa (const struct floatformat *,
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const bfd_byte *);
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/* Given TYPE, return its floatformat. TYPE_FLOATFORMAT() may return
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NULL. type_floatformat() detects that and returns a floatformat
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based on the type size when FLOATFORMAT is NULL. */
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const struct floatformat *floatformat_from_type (const struct type *type);
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/* Return the floatformat's total size in host bytes. */
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extern size_t floatformat_totalsize_bytes (const struct floatformat *fmt);
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extern DOUBLEST extract_typed_floating (const void *addr,
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const struct type *type);
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extern void store_typed_floating (void *addr, const struct type *type,
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DOUBLEST val);
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extern void convert_typed_floating (const void *from,
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const struct type *from_type,
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void *to, const struct type *to_type);
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#endif
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