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0db7851f9f
For historical reasons, the TYPE_FLOATFORMAT element is still set to hold
an array of two floatformat structs, one for big-endian and the other for
little-endian. When accessing the element via floatformat_from_type,
the code would check the type's byte order and return the appropriate
floatformat.
However, these days this is quite unnecessary, since the type's byte order
is already known at the time the type is allocated and the floatformat is
installed into TYPE_FLOATFORMAT. Therefore, we can just install the correct
version here.
Also, moves the (now trivially simple) floatformat_from_type accessor to
gdbtypes.{c,h}, since it doesn't really need to be in doublest.c now.
gdb/ChangeLog
2017-09-27 Ulrich Weigand <uweigand@de.ibm.com>
* doublest.h (floatformat_from_type): Move to gdbtypes.h.
* doublest.c (floatformat_from_type): Move to gdbtypes.c.
* gdbtypes.h (union type_specific): Make field floatformat hold
just a single struct floatformat, not an array.
(floatformat_from_type): Move here.
* gdbtypes.c (floatformat_from_type): Move here. Update to
changed TYPE_FLOATFORMAT definition.
(verify_floatformat): Update to changed TYPE_FLOATFORMAT.
(recursive_dump_type): Likewise.
(init_float_type): Install correct floatformat for byte order.
(arch_float_type): Likewise.
99 lines
3.6 KiB
C
99 lines
3.6 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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/* 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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