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/* Floating point routines for GDB, the GNU debugger.
Copyright (C) 2017 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "dfp.h"
#include "doublest.h"
#include "gdbtypes.h"
#include "floatformat.h"
#include "target-float.h"
/* Typed floating-point routines. These routines operate on floating-point
values in target format, represented by a byte buffer interpreted as a
"struct type", which may be either a binary or decimal floating-point
type (TYPE_CODE_FLT or TYPE_CODE_DECFLOAT). */
/* Return whether the byte-stream ADDR holds a valid value of
floating-point type TYPE. */
bool
target_float_is_valid (const gdb_byte *addr, const struct type *type)
{
if (TYPE_CODE (type) == TYPE_CODE_FLT)
return floatformat_is_valid (floatformat_from_type (type), addr);
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
return true;
gdb_assert_not_reached ("unexpected type code");
}
/* Return whether the byte-stream ADDR, interpreted as floating-point
type TYPE, is numerically equal to zero (of either sign). */
bool
target_float_is_zero (const gdb_byte *addr, const struct type *type)
{
if (TYPE_CODE (type) == TYPE_CODE_FLT)
return (floatformat_classify (floatformat_from_type (type), addr)
== float_zero);
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
return decimal_is_zero (addr, TYPE_LENGTH (type),
gdbarch_byte_order (get_type_arch (type)));
gdb_assert_not_reached ("unexpected type code");
}
/* Convert the byte-stream ADDR, interpreted as floating-point type TYPE,
to a string, optionally using the print format FORMAT. */
std::string
target_float_to_string (const gdb_byte *addr, const struct type *type,
const char *format)
{
if (TYPE_CODE (type) == TYPE_CODE_FLT)
return floatformat_to_string (floatformat_from_type (type), addr, format);
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
return decimal_to_string (addr, TYPE_LENGTH (type),
gdbarch_byte_order (get_type_arch (type)),
format);
gdb_assert_not_reached ("unexpected type code");
}
/* Parse string STRING into a target floating-number of type TYPE and
store it as byte-stream ADDR. Return whether parsing succeeded. */
bool
target_float_from_string (gdb_byte *addr, const struct type *type,
const std::string &string)
{
/* Ensure possible padding bytes in the target buffer are zeroed out. */
memset (addr, 0, TYPE_LENGTH (type));
if (TYPE_CODE (type) == TYPE_CODE_FLT)
return floatformat_from_string (floatformat_from_type (type), addr,
string);
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
return decimal_from_string (addr, TYPE_LENGTH (type),
gdbarch_byte_order (get_type_arch (type)),
string);
gdb_assert_not_reached ("unexpected type code");
}
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