commit 483a6a52ee7e9aac0ab542c034a7e716d2fc6ef3
parent 5f934c35fb33d3194b7d8a11b01ceb074734434d
Author: Heikki Lindholm <holin@iki.fi>
Date: Fri, 28 Dec 2007 15:22:55 +0000
add readers for various float types (from gdb)
Diffstat:
3 files changed, 777 insertions(+), 2 deletions(-)
diff --git a/src/plugins/Makefile.am b/src/plugins/Makefile.am
@@ -125,8 +125,8 @@ endif
noinst_LTLIBRARIES = \
libpack.la \
- libconvert.la
-
+ libconvert.la \
+ libconvert_numeric.la
if HAVE_ZLIB
libextractor_qt_la_LDFLAGS = \
@@ -238,6 +238,10 @@ libconvert_la_SOURCES = \
libconvert_la_LDFLAGS = \
$(LIBICONV)
+libconvert_numeric_la_SOURCES = \
+ convert_numeric.c \
+ convert_numeric.h
+
libextractor_zip_la_SOURCES = \
zipextractor.c
libextractor_zip_la_LDFLAGS = \
diff --git a/src/plugins/convert_numeric.c b/src/plugins/convert_numeric.c
@@ -0,0 +1,631 @@
+/* IEEE floating point support routines, for GDB, the GNU Debugger.
+ Copyright 1991, 1994, 1999, 2000, 2003, 2005, 2006
+ 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 2 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, write to the Free Software
+Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
+
+/* This is needed to pick up the NAN macro on some systems. */
+/* #define _GNU_SOURCE */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <math.h>
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+/* On some platforms, <float.h> provides DBL_QNAN. */
+#ifdef STDC_HEADERS
+#include <float.h>
+#endif
+
+/*#include "ansidecl.h"*/
+/*#include "libiberty.h"*/
+#include "convert_numeric.h"
+
+#ifndef INFINITY
+#ifdef HUGE_VAL
+#define INFINITY HUGE_VAL
+#else
+#define INFINITY (1.0 / 0.0)
+#endif
+#endif
+
+#ifndef NAN
+#ifdef DBL_QNAN
+#define NAN DBL_QNAN
+#else
+#define NAN (0.0 / 0.0)
+#endif
+#endif
+
+static unsigned long get_field (const unsigned char *,
+ enum floatformat_byteorders,
+ unsigned int,
+ unsigned int,
+ unsigned int);
+static int floatformat_always_valid (const struct floatformat *fmt,
+ const void *from);
+
+static int
+floatformat_always_valid (const struct floatformat *fmt /*ATTRIBUTE_UNUSED*/,
+ const void *from /*ATTRIBUTE_UNUSED*/)
+{
+ return 1;
+}
+
+/* The odds that CHAR_BIT will be anything but 8 are low enough that I'm not
+ going to bother with trying to muck around with whether it is defined in
+ a system header, what we do if not, etc. */
+#define FLOATFORMAT_CHAR_BIT 8
+
+/* floatformats for IEEE single and double, big and little endian. */
+const struct floatformat floatformat_ieee_single_big =
+{
+ floatformat_big, 32, 0, 1, 8, 127, 255, 9, 23,
+ floatformat_intbit_no,
+ "floatformat_ieee_single_big",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_ieee_single_little =
+{
+ floatformat_little, 32, 0, 1, 8, 127, 255, 9, 23,
+ floatformat_intbit_no,
+ "floatformat_ieee_single_little",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_ieee_double_big =
+{
+ floatformat_big, 64, 0, 1, 11, 1023, 2047, 12, 52,
+ floatformat_intbit_no,
+ "floatformat_ieee_double_big",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_ieee_double_little =
+{
+ floatformat_little, 64, 0, 1, 11, 1023, 2047, 12, 52,
+ floatformat_intbit_no,
+ "floatformat_ieee_double_little",
+ floatformat_always_valid
+};
+
+/* floatformat for IEEE double, little endian byte order, with big endian word
+ ordering, as on the ARM. */
+
+const struct floatformat floatformat_ieee_double_littlebyte_bigword =
+{
+ floatformat_littlebyte_bigword, 64, 0, 1, 11, 1023, 2047, 12, 52,
+ floatformat_intbit_no,
+ "floatformat_ieee_double_littlebyte_bigword",
+ floatformat_always_valid
+};
+
+/* floatformat for VAX. Not quite IEEE, but close enough. */
+
+const struct floatformat floatformat_vax_f =
+{
+ floatformat_vax, 32, 0, 1, 8, 129, 0, 9, 23,
+ floatformat_intbit_no,
+ "floatformat_vax_f",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_vax_d =
+{
+ floatformat_vax, 64, 0, 1, 8, 129, 0, 9, 55,
+ floatformat_intbit_no,
+ "floatformat_vax_d",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_vax_g =
+{
+ floatformat_vax, 64, 0, 1, 11, 1025, 0, 12, 52,
+ floatformat_intbit_no,
+ "floatformat_vax_g",
+ floatformat_always_valid
+};
+
+static int floatformat_i387_ext_is_valid (const struct floatformat *fmt,
+ const void *from);
+
+static int
+floatformat_i387_ext_is_valid (const struct floatformat *fmt, const void *from)
+{
+ /* In the i387 double-extended format, if the exponent is all ones,
+ then the integer bit must be set. If the exponent is neither 0
+ nor ~0, the intbit must also be set. Only if the exponent is
+ zero can it be zero, and then it must be zero. */
+ unsigned long exponent, int_bit;
+ const unsigned char *ufrom = (const unsigned char *) from;
+
+ exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize,
+ fmt->exp_start, fmt->exp_len);
+ int_bit = get_field (ufrom, fmt->byteorder, fmt->totalsize,
+ fmt->man_start, 1);
+
+ if ((exponent == 0) != (int_bit == 0))
+ return 0;
+ else
+ return 1;
+}
+
+const struct floatformat floatformat_i387_ext =
+{
+ floatformat_little, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64,
+ floatformat_intbit_yes,
+ "floatformat_i387_ext",
+ floatformat_i387_ext_is_valid
+};
+const struct floatformat floatformat_m68881_ext =
+{
+ /* Note that the bits from 16 to 31 are unused. */
+ floatformat_big, 96, 0, 1, 15, 0x3fff, 0x7fff, 32, 64,
+ floatformat_intbit_yes,
+ "floatformat_m68881_ext",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_i960_ext =
+{
+ /* Note that the bits from 0 to 15 are unused. */
+ floatformat_little, 96, 16, 17, 15, 0x3fff, 0x7fff, 32, 64,
+ floatformat_intbit_yes,
+ "floatformat_i960_ext",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_m88110_ext =
+{
+ floatformat_big, 80, 0, 1, 15, 0x3fff, 0x7fff, 16, 64,
+ floatformat_intbit_yes,
+ "floatformat_m88110_ext",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_m88110_harris_ext =
+{
+ /* Harris uses raw format 128 bytes long, but the number is just an ieee
+ double, and the last 64 bits are wasted. */
+ floatformat_big,128, 0, 1, 11, 0x3ff, 0x7ff, 12, 52,
+ floatformat_intbit_no,
+ "floatformat_m88110_ext_harris",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_arm_ext_big =
+{
+ /* Bits 1 to 16 are unused. */
+ floatformat_big, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64,
+ floatformat_intbit_yes,
+ "floatformat_arm_ext_big",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_arm_ext_littlebyte_bigword =
+{
+ /* Bits 1 to 16 are unused. */
+ floatformat_littlebyte_bigword, 96, 0, 17, 15, 0x3fff, 0x7fff, 32, 64,
+ floatformat_intbit_yes,
+ "floatformat_arm_ext_littlebyte_bigword",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_ia64_spill_big =
+{
+ floatformat_big, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64,
+ floatformat_intbit_yes,
+ "floatformat_ia64_spill_big",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_ia64_spill_little =
+{
+ floatformat_little, 128, 0, 1, 17, 65535, 0x1ffff, 18, 64,
+ floatformat_intbit_yes,
+ "floatformat_ia64_spill_little",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_ia64_quad_big =
+{
+ floatformat_big, 128, 0, 1, 15, 16383, 0x7fff, 16, 112,
+ floatformat_intbit_no,
+ "floatformat_ia64_quad_big",
+ floatformat_always_valid
+};
+const struct floatformat floatformat_ia64_quad_little =
+{
+ floatformat_little, 128, 0, 1, 15, 16383, 0x7fff, 16, 112,
+ floatformat_intbit_no,
+ "floatformat_ia64_quad_little",
+ floatformat_always_valid
+};
+
+
+#ifndef min
+#define min(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
+/* Extract a field which starts at START and is LEN bits long. DATA and
+ TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */
+static unsigned long
+get_field (const unsigned char *data, enum floatformat_byteorders order,
+ unsigned int total_len, unsigned int start, unsigned int len)
+{
+ unsigned long result = 0;
+ unsigned int cur_byte;
+ int lo_bit, hi_bit, cur_bitshift = 0;
+ int nextbyte = (order == floatformat_little) ? 1 : -1;
+
+ /* Start is in big-endian bit order! Fix that first. */
+ start = total_len - (start + len);
+
+ /* Start at the least significant part of the field. */
+ if (order == floatformat_little)
+ cur_byte = start / FLOATFORMAT_CHAR_BIT;
+ else
+ cur_byte = (total_len - start - 1) / FLOATFORMAT_CHAR_BIT;
+
+ lo_bit = start % FLOATFORMAT_CHAR_BIT;
+ hi_bit = min (lo_bit + len, FLOATFORMAT_CHAR_BIT);
+
+ do
+ {
+ unsigned int shifted = *(data + cur_byte) >> lo_bit;
+ unsigned int bits = hi_bit - lo_bit;
+ unsigned int mask = (1 << bits) - 1;
+ result |= (shifted & mask) << cur_bitshift;
+ len -= bits;
+ cur_bitshift += bits;
+ cur_byte += nextbyte;
+ lo_bit = 0;
+ hi_bit = min (len, FLOATFORMAT_CHAR_BIT);
+ }
+ while (len != 0);
+
+ return result;
+}
+
+/* Convert from FMT to a double.
+ FROM is the address of the extended float.
+ Store the double in *TO. */
+
+void
+floatformat_to_double (const struct floatformat *fmt,
+ const void *from, double *to)
+{
+ const unsigned char *ufrom = (const unsigned char *) from;
+ double dto;
+ long exponent;
+ unsigned long mant;
+ unsigned int mant_bits, mant_off;
+ int mant_bits_left;
+ int special_exponent; /* It's a NaN, denorm or zero */
+
+ exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize,
+ fmt->exp_start, fmt->exp_len);
+
+ /* If the exponent indicates a NaN, we don't have information to
+ decide what to do. So we handle it like IEEE, except that we
+ don't try to preserve the type of NaN. FIXME. */
+ if ((unsigned long) exponent == fmt->exp_nan)
+ {
+ int nan;
+
+ mant_off = fmt->man_start;
+ mant_bits_left = fmt->man_len;
+ nan = 0;
+ while (mant_bits_left > 0)
+ {
+ mant_bits = min (mant_bits_left, 32);
+
+ if (get_field (ufrom, fmt->byteorder, fmt->totalsize,
+ mant_off, mant_bits) != 0)
+ {
+ /* This is a NaN. */
+ nan = 1;
+ break;
+ }
+
+ mant_off += mant_bits;
+ mant_bits_left -= mant_bits;
+ }
+
+ /* On certain systems (such as GNU/Linux), the use of the
+ INFINITY macro below may generate a warning that can not be
+ silenced due to a bug in GCC (PR preprocessor/11931). The
+ preprocessor fails to recognise the __extension__ keyword in
+ conjunction with the GNU/C99 extension for hexadecimal
+ floating point constants and will issue a warning when
+ compiling with -pedantic. */
+ if (nan)
+ dto = NAN;
+ else
+ dto = INFINITY;
+
+ if (get_field (ufrom, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1))
+ dto = -dto;
+
+ *to = dto;
+
+ return;
+ }
+
+ mant_bits_left = fmt->man_len;
+ mant_off = fmt->man_start;
+ dto = 0.0;
+
+ special_exponent = exponent == 0 || (unsigned long) exponent == fmt->exp_nan;
+
+ /* Don't bias zero's, denorms or NaNs. */
+ if (!special_exponent)
+ exponent -= fmt->exp_bias;
+
+ /* Build the result algebraically. Might go infinite, underflow, etc;
+ who cares. */
+
+ /* If this format uses a hidden bit, explicitly add it in now. Otherwise,
+ increment the exponent by one to account for the integer bit. */
+
+ if (!special_exponent)
+ {
+ if (fmt->intbit == floatformat_intbit_no)
+ dto = ldexp (1.0, exponent);
+ else
+ exponent++;
+ }
+
+ while (mant_bits_left > 0)
+ {
+ mant_bits = min (mant_bits_left, 32);
+
+ mant = get_field (ufrom, fmt->byteorder, fmt->totalsize,
+ mant_off, mant_bits);
+
+ /* Handle denormalized numbers. FIXME: What should we do for
+ non-IEEE formats? */
+ if (special_exponent && exponent == 0 && mant != 0)
+ dto += ldexp ((double)mant,
+ (- fmt->exp_bias
+ - mant_bits
+ - (mant_off - fmt->man_start)
+ + 1));
+ else
+ dto += ldexp ((double)mant, exponent - mant_bits);
+ if (exponent != 0)
+ exponent -= mant_bits;
+ mant_off += mant_bits;
+ mant_bits_left -= mant_bits;
+ }
+
+ /* Negate it if negative. */
+ if (get_field (ufrom, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1))
+ dto = -dto;
+ *to = dto;
+}
+
+static void put_field (unsigned char *, enum floatformat_byteorders,
+ unsigned int,
+ unsigned int,
+ unsigned int,
+ unsigned long);
+
+/* Set a field which starts at START and is LEN bits long. DATA and
+ TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */
+static void
+put_field (unsigned char *data, enum floatformat_byteorders order,
+ unsigned int total_len, unsigned int start, unsigned int len,
+ unsigned long stuff_to_put)
+{
+ unsigned int cur_byte;
+ int lo_bit, hi_bit;
+ int nextbyte = (order == floatformat_little) ? 1 : -1;
+
+ /* Start is in big-endian bit order! Fix that first. */
+ start = total_len - (start + len);
+
+ /* Start at the least significant part of the field. */
+ if (order == floatformat_little)
+ cur_byte = start / FLOATFORMAT_CHAR_BIT;
+ else
+ cur_byte = (total_len - start - 1) / FLOATFORMAT_CHAR_BIT;
+
+ lo_bit = start % FLOATFORMAT_CHAR_BIT;
+ hi_bit = min (lo_bit + len, FLOATFORMAT_CHAR_BIT);
+
+ do
+ {
+ unsigned char *byte_ptr = data + cur_byte;
+ unsigned int bits = hi_bit - lo_bit;
+ unsigned int mask = ((1 << bits) - 1) << lo_bit;
+ *byte_ptr = (*byte_ptr & ~mask) | ((stuff_to_put << lo_bit) & mask);
+ stuff_to_put >>= bits;
+ len -= bits;
+ cur_byte += nextbyte;
+ lo_bit = 0;
+ hi_bit = min (len, FLOATFORMAT_CHAR_BIT);
+ }
+ while (len != 0);
+}
+
+/* The converse: convert the double *FROM to an extended float
+ and store where TO points. Neither FROM nor TO have any alignment
+ restrictions. */
+
+void
+floatformat_from_double (const struct floatformat *fmt,
+ const double *from, void *to)
+{
+ double dfrom;
+ int exponent;
+ double mant;
+ unsigned int mant_bits, mant_off;
+ int mant_bits_left;
+ unsigned char *uto = (unsigned char *) to;
+
+ dfrom = *from;
+ memset (uto, 0, fmt->totalsize / FLOATFORMAT_CHAR_BIT);
+
+ /* If negative, set the sign bit. */
+ if (dfrom < 0)
+ {
+ put_field (uto, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1, 1);
+ dfrom = -dfrom;
+ }
+
+ if (dfrom == 0)
+ {
+ /* 0.0. */
+ return;
+ }
+
+ if (dfrom != dfrom)
+ {
+ /* NaN. */
+ put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len, fmt->exp_nan);
+ /* Be sure it's not infinity, but NaN value is irrelevant. */
+ put_field (uto, fmt->byteorder, fmt->totalsize, fmt->man_start,
+ 32, 1);
+ return;
+ }
+
+ if (dfrom + dfrom == dfrom)
+ {
+ /* This can only happen for an infinite value (or zero, which we
+ already handled above). */
+ put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len, fmt->exp_nan);
+ return;
+ }
+
+ mant = frexp (dfrom, &exponent);
+ if (exponent + fmt->exp_bias - 1 > 0)
+ put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len, exponent + fmt->exp_bias - 1);
+ else
+ {
+ /* Handle a denormalized number. FIXME: What should we do for
+ non-IEEE formats? */
+ put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start,
+ fmt->exp_len, 0);
+ mant = ldexp (mant, exponent + fmt->exp_bias - 1);
+ }
+
+ mant_bits_left = fmt->man_len;
+ mant_off = fmt->man_start;
+ while (mant_bits_left > 0)
+ {
+ unsigned long mant_long;
+ mant_bits = mant_bits_left < 32 ? mant_bits_left : 32;
+
+ mant *= 4294967296.0;
+ mant_long = (unsigned long)mant;
+ mant -= mant_long;
+
+ /* If the integer bit is implicit, and we are not creating a
+ denormalized number, then we need to discard it. */
+ if ((unsigned int) mant_bits_left == fmt->man_len
+ && fmt->intbit == floatformat_intbit_no
+ && exponent + fmt->exp_bias - 1 > 0)
+ {
+ mant_long &= 0x7fffffff;
+ mant_bits -= 1;
+ }
+ else if (mant_bits < 32)
+ {
+ /* The bits we want are in the most significant MANT_BITS bits of
+ mant_long. Move them to the least significant. */
+ mant_long >>= 32 - mant_bits;
+ }
+
+ put_field (uto, fmt->byteorder, fmt->totalsize,
+ mant_off, mant_bits, mant_long);
+ mant_off += mant_bits;
+ mant_bits_left -= mant_bits;
+ }
+}
+
+/* Return non-zero iff the data at FROM is a valid number in format FMT. */
+
+int
+floatformat_is_valid (const struct floatformat *fmt, const void *from)
+{
+ return fmt->is_valid (fmt, from);
+}
+
+
+#ifdef IEEE_DEBUG
+
+#include <stdio.h>
+
+/* This is to be run on a host which uses IEEE floating point. */
+
+void
+ieee_test (double n)
+{
+ double result;
+
+ floatformat_to_double (&floatformat_ieee_double_little, &n, &result);
+ if ((n != result && (! isnan (n) || ! isnan (result)))
+ || (n < 0 && result >= 0)
+ || (n >= 0 && result < 0))
+ printf ("Differ(to): %.20g -> %.20g\n", n, result);
+
+ floatformat_from_double (&floatformat_ieee_double_little, &n, &result);
+ if ((n != result && (! isnan (n) || ! isnan (result)))
+ || (n < 0 && result >= 0)
+ || (n >= 0 && result < 0))
+ printf ("Differ(from): %.20g -> %.20g\n", n, result);
+
+#if 0
+ {
+ char exten[16];
+
+ floatformat_from_double (&floatformat_m68881_ext, &n, exten);
+ floatformat_to_double (&floatformat_m68881_ext, exten, &result);
+ if (n != result)
+ printf ("Differ(to+from): %.20g -> %.20g\n", n, result);
+ }
+#endif
+
+#if IEEE_DEBUG > 1
+ /* This is to be run on a host which uses 68881 format. */
+ {
+ long double ex = *(long double *)exten;
+ if (ex != n)
+ printf ("Differ(from vs. extended): %.20g\n", n);
+ }
+#endif
+}
+
+int
+main (void)
+{
+ ieee_test (0.0);
+ ieee_test (0.5);
+ ieee_test (256.0);
+ ieee_test (0.12345);
+ ieee_test (234235.78907234);
+ ieee_test (-512.0);
+ ieee_test (-0.004321);
+ ieee_test (1.2E-70);
+ ieee_test (1.2E-316);
+ ieee_test (4.9406564584124654E-324);
+ ieee_test (- 4.9406564584124654E-324);
+ ieee_test (- 0.0);
+ ieee_test (- INFINITY);
+ ieee_test (- NAN);
+ ieee_test (INFINITY);
+ ieee_test (NAN);
+ return 0;
+}
+#endif
diff --git a/src/plugins/convert_numeric.h b/src/plugins/convert_numeric.h
@@ -0,0 +1,140 @@
+/* IEEE floating point support declarations, for GDB, the GNU Debugger.
+ Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005
+ 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 2 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, write to the Free Software
+Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#if !defined (FLOATFORMAT_H)
+#define FLOATFORMAT_H 1
+
+/*#include "ansidecl.h"*/
+
+/* A floatformat consists of a sign bit, an exponent and a mantissa. Once the
+ bytes are concatenated according to the byteorder flag, then each of those
+ fields is contiguous. We number the bits with 0 being the most significant
+ (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field
+ contains with the *_start and *_len fields. */
+
+/* What is the order of the bytes? */
+
+enum floatformat_byteorders {
+ /* Standard little endian byte order.
+ EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */
+ floatformat_little,
+
+ /* Standard big endian byte order.
+ EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */
+ floatformat_big,
+
+ /* Little endian byte order but big endian word order.
+ EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */
+ floatformat_littlebyte_bigword,
+
+ /* VAX byte order. Little endian byte order with 16-bit words. The
+ following example is an illustration of the byte order only; VAX
+ doesn't have a fully IEEE compliant floating-point format.
+ EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */
+ floatformat_vax
+};
+
+enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };
+
+struct floatformat
+{
+ enum floatformat_byteorders byteorder;
+ unsigned int totalsize; /* Total size of number in bits */
+
+ /* Sign bit is always one bit long. 1 means negative, 0 means positive. */
+ unsigned int sign_start;
+
+ unsigned int exp_start;
+ unsigned int exp_len;
+ /* Bias added to a "true" exponent to form the biased exponent. It
+ is intentionally signed as, otherwize, -exp_bias can turn into a
+ very large number (e.g., given the exp_bias of 0x3fff and a 64
+ bit long, the equation (long)(1 - exp_bias) evaluates to
+ 4294950914) instead of -16382). */
+ int exp_bias;
+ /* Exponent value which indicates NaN. This is the actual value stored in
+ the float, not adjusted by the exp_bias. This usually consists of all
+ one bits. */
+ unsigned int exp_nan;
+
+ unsigned int man_start;
+ unsigned int man_len;
+
+ /* Is the integer bit explicit or implicit? */
+ enum floatformat_intbit intbit;
+
+ /* Internal name for debugging. */
+ const char *name;
+
+ /* Validator method. */
+ int (*is_valid) (const struct floatformat *fmt, const void *from);
+};
+
+/* floatformats for IEEE single and double, big and little endian. */
+
+extern const struct floatformat floatformat_ieee_single_big;
+extern const struct floatformat floatformat_ieee_single_little;
+extern const struct floatformat floatformat_ieee_double_big;
+extern const struct floatformat floatformat_ieee_double_little;
+
+/* floatformat for ARM IEEE double, little endian bytes and big endian words */
+
+extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;
+
+/* floatformats for VAX. */
+
+extern const struct floatformat floatformat_vax_f;
+extern const struct floatformat floatformat_vax_d;
+extern const struct floatformat floatformat_vax_g;
+
+/* floatformats for various extendeds. */
+
+extern const struct floatformat floatformat_i387_ext;
+extern const struct floatformat floatformat_m68881_ext;
+extern const struct floatformat floatformat_i960_ext;
+extern const struct floatformat floatformat_m88110_ext;
+extern const struct floatformat floatformat_m88110_harris_ext;
+extern const struct floatformat floatformat_arm_ext_big;
+extern const struct floatformat floatformat_arm_ext_littlebyte_bigword;
+/* IA-64 Floating Point register spilt into memory. */
+extern const struct floatformat floatformat_ia64_spill_big;
+extern const struct floatformat floatformat_ia64_spill_little;
+extern const struct floatformat floatformat_ia64_quad_big;
+extern const struct floatformat floatformat_ia64_quad_little;
+
+/* Convert from FMT to a double.
+ FROM is the address of the extended float.
+ Store the double in *TO. */
+
+extern void
+floatformat_to_double (const struct floatformat *, const void *, double *);
+
+/* The converse: convert the double *FROM to FMT
+ and store where TO points. */
+
+extern void
+floatformat_from_double (const struct floatformat *, const double *, void *);
+
+/* Return non-zero iff the data at FROM is a valid number in format FMT. */
+
+extern int
+floatformat_is_valid (const struct floatformat *fmt, const void *from);
+
+#endif /* defined (FLOATFORMAT_H) */
