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Isuru Samarathunga
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/**
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* \file libyasm/floatnum.h
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* \brief YASM floating point (IEEE) interface.
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*
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* \license
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* Copyright (C) 2001-2007 Peter Johnson
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*
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* Based on public-domain x86 assembly code by Randall Hyde (8/28/91).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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* \endlicense
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*/
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#ifndef YASM_FLOATNUM_H
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#define YASM_FLOATNUM_H
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#ifndef YASM_LIB_DECL
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#define YASM_LIB_DECL
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#endif
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/** Initialize floatnum internal data structures. */
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YASM_LIB_DECL
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void yasm_floatnum_initialize(void);
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/** Clean up internal floatnum allocations. */
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YASM_LIB_DECL
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void yasm_floatnum_cleanup(void);
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/** Create a new floatnum from a decimal string. The input string must be in
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* standard C representation ([+-]123.456e[-+]789).
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* \param str floating point decimal string
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* \return Newly allocated floatnum.
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*/
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YASM_LIB_DECL
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/*@only@*/ yasm_floatnum *yasm_floatnum_create(const char *str);
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/** Duplicate a floatnum.
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* \param flt floatnum
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* \return Newly allocated floatnum with the same value as flt.
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*/
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YASM_LIB_DECL
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/*@only@*/ yasm_floatnum *yasm_floatnum_copy(const yasm_floatnum *flt);
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/** Destroy (free allocated memory for) a floatnum.
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* \param flt floatnum
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*/
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YASM_LIB_DECL
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void yasm_floatnum_destroy(/*@only@*/ yasm_floatnum *flt);
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/** Floating point calculation function: acc = acc op operand.
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* \note Not all operations in yasm_expr_op may be supported; unsupported
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* operations will result in an error.
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* \param acc floatnum accumulator
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* \param op operation
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* \param operand floatnum operand
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* \return Nonzero on error.
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*/
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YASM_LIB_DECL
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int yasm_floatnum_calc(yasm_floatnum *acc, yasm_expr_op op,
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yasm_floatnum *operand);
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/** Convert a floatnum to single-precision and return as 32-bit value.
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* The 32-bit value is a "standard" C value (eg, of unknown endian).
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* \param flt floatnum
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* \param ret_val pointer to storage for 32-bit output
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* \return Nonzero if flt can't fit into single precision: -1 if underflow
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* occurred, 1 if overflow occurred.
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*/
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YASM_LIB_DECL
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int yasm_floatnum_get_int(const yasm_floatnum *flt,
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/*@out@*/ unsigned long *ret_val);
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/** Output a #yasm_floatnum to buffer in little-endian or big-endian. Puts the
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* value into the least significant bits of the destination, or may be shifted
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* into more significant bits by the shift parameter. The destination bits are
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* cleared before being set. [0] should be the first byte output to the file.
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* \note Not all sizes are valid. Currently, only 32 (single-precision), 64
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* (double-precision), and 80 (extended-precision) are valid sizes.
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* Use yasm_floatnum_check_size() to check for supported sizes.
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* \param flt floatnum
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* \param ptr pointer to storage for size bytes of output
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* \param destsize destination size (in bytes)
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* \param valsize size (in bits)
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* \param shift left shift (in bits)
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* \param bigendian endianness (nonzero=big, zero=little)
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* \param warn enables standard overflow/underflow warnings
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* \return Nonzero if flt can't fit into the specified precision: -1 if
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* underflow occurred, 1 if overflow occurred.
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*/
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YASM_LIB_DECL
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int yasm_floatnum_get_sized(const yasm_floatnum *flt, unsigned char *ptr,
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size_t destsize, size_t valsize, size_t shift,
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int bigendian, int warn);
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/** Basic check to see if size is valid for flt conversion (using
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* yasm_floatnum_get_sized()). Doesn't actually check for underflow/overflow
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* but rather checks for size=32,64,80
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* (at present).
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* \param flt floatnum
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* \param size number of bits of output space
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* \return 1 if valid size, 0 if invalid size.
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*/
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YASM_LIB_DECL
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int yasm_floatnum_check_size(const yasm_floatnum *flt, size_t size);
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/** Print various representations of a floatnum. For debugging purposes only.
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* \param f file
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* \param flt floatnum
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*/
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YASM_LIB_DECL
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void yasm_floatnum_print(const yasm_floatnum *flt, FILE *f);
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#endif
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