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* defs.h (HOST_FLOAT_FORMAT, HOST_DOUBLE_FORMAT)

Browse Source 
(HOST_FLOAT_FORMAT, HOST_DOUBLE_FORMAT)
(HOST_LONG_DOUBLE_FORMAT, DOUBLEST)
(floatformat_to_doublest, floatformat_from_doublest)
(floatformat_is_negative, floatformat_is_nan)
(floatformat_mantissa, store_floating)
(extract_floating): Move declaration from here.
* doublest.h: To here.  New file.
* utils.c (get_field, floatformat_to_doublest, put_field)
(ldfrexp, floatformat_from_doublest, floatformat_is_negative)
(floatformat_is_nan, floatformat_mantissa)
(FLOATFORMAT_CHAR_BIT): Move from here.
* doublest.c: To here.  New file.
* findvar.c (store_floating, extract_floating): Move from here.
* doublest.c: To here.
* Makefile.in (SFILES): Add doublest.c.
(COMMON_OBS): Add doublest.o.
(doublest.o): Specify dependencies.
(doublest_h): Define.

* config/m88k/tm-m88k.h: Include "doublest.h".
* config/i960/tm-i960.h: Ditto.
* config/i386/tm-symmetry.h: Ditto.
* rs6000-tdep.c, valarith.c: Ditto.
* valprint.c, stabsread.c, sh-tdep.c: Ditto.
* ia64-tdep.c, i387-tdep.c, i386-tdep.c: Ditto.
* values.c, arm-tdep.c, arm-linux-tdep.c: Ditto.
* alpha-tdep.c, ax.h, expression.h: Ditto.
* sh-tdep.c, parse.c, top.c, value.h: Ditto.

* Makefile.in (arm-tdep.o): Add $(doublest_h).
(i386-tdep.o, i387-tdep.o, ia64-tdep.o): Ditto.
(rs6000-tdep.o, stabsread.o, valarith.o): Ditto.
(values.o, valprint.o, arm-linux-tdep.o): Ditto.
(alpha-tdep.o, ax_h, parse.o, top.o, value_h): Ditto.
(parser_defs_h): Ditto.
(expression_h): Add $(doublest_h) and $(symtab_h).
This commit is contained in:
Andrew Cagney 2001-08-01 18:39:27 +00:00
parent 1b0cad1ced
commit d16aafd8c8
28 changed files with 806 additions and 679 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
gdb/ChangeLog
View File

@ -1,3 +1,43 @@
2001-07-31 Andrew Cagney <ac131313@redhat.com>
* defs.h (HOST_FLOAT_FORMAT, HOST_DOUBLE_FORMAT)
(HOST_FLOAT_FORMAT, HOST_DOUBLE_FORMAT)
(HOST_LONG_DOUBLE_FORMAT, DOUBLEST)
(floatformat_to_doublest, floatformat_from_doublest)
(floatformat_is_negative, floatformat_is_nan)
(floatformat_mantissa, store_floating)
(extract_floating): Move declaration from here.
* doublest.h: To here. New file.
* utils.c (get_field, floatformat_to_doublest, put_field)
(ldfrexp, floatformat_from_doublest, floatformat_is_negative)
(floatformat_is_nan, floatformat_mantissa)
(FLOATFORMAT_CHAR_BIT): Move from here.
* doublest.c: To here. New file.
* findvar.c (store_floating, extract_floating): Move from here.
* doublest.c: To here.
* Makefile.in (SFILES): Add doublest.c.
(COMMON_OBS): Add doublest.o.
(doublest.o): Specify dependencies.
(doublest_h): Define.
* config/m88k/tm-m88k.h: Include "doublest.h".
* config/i960/tm-i960.h: Ditto.
* config/i386/tm-symmetry.h: Ditto.
* rs6000-tdep.c, valarith.c: Ditto.
* valprint.c, stabsread.c, sh-tdep.c: Ditto.
* ia64-tdep.c, i387-tdep.c, i386-tdep.c: Ditto.
* values.c, arm-tdep.c, arm-linux-tdep.c: Ditto.
* alpha-tdep.c, ax.h, expression.h: Ditto.
* sh-tdep.c, parse.c, top.c, value.h: Ditto.
* Makefile.in (arm-tdep.o): Add $(doublest_h).
(i386-tdep.o, i387-tdep.o, ia64-tdep.o): Ditto.
(rs6000-tdep.o, stabsread.o, valarith.o): Ditto.
(values.o, valprint.o, arm-linux-tdep.o): Ditto.
(alpha-tdep.o, ax_h, parse.o, top.o, value_h): Ditto.
(parser_defs_h): Ditto.
(expression_h): Add $(doublest_h) and $(symtab_h).
2001-08-01 Andrew Cagney <ac131313@redhat.com>
* Makefile.in: Sort header definitions.

47
gdb/Makefile.in
View File

@ -541,7 +541,7 @@ SFILES = ax-general.c ax-gdb.c bcache.c blockframe.c breakpoint.c \
tui/tuiStack.c tui/tuiStack.h tui/tuiWin.c tui/tuiWin.h \
tui/tui-file.h tui/tui-file.c tui/tui-out.c tui/tui-hooks.c \
ui-file.h ui-file.c \
frame.c \
frame.c doublest.c \
gnu-v2-abi.c gnu-v3-abi.c hpacc-abi.c cp-abi.c
LINTFILES = $(SFILES) $(YYFILES) $(CONFIG_SRCS) init.c
@ -579,7 +579,7 @@ nm_h = @nm_h@
annotate_h = annotate.h $(symtab_h) $(gdbtypes_h)
arch_utils_h = arch-utils.h
ax_h = ax.h
ax_h = ax.h $(doublest_h)
breakpoint_h = breakpoint.h $(frame_h) $(value_h)
call_cmds_h = call-cmds.h
cli_cmds_h = $(srcdir)/cli/cli-cmds.h
@ -593,9 +593,10 @@ completer_h = completer.h
cp_abi_h = cp-abi.h
dcache_h = dcache.h
defs_h = defs.h $(xm_h) $(tm_h) $(nm_h) config.status config.h gdbarch.h ui-file.h
doublest_h = doublest.h $(floatformat_h)
event_loop_h = event-loop.h
event_top_h = event-top.h
expression_h = expression.h
expression_h = expression.h $(doublest_h) $(symtab_h)
frame_h = frame.h
gdb_h = gdb.h
gdb_string_h = gdb_string.h
@ -606,7 +607,7 @@ gdbtypes_h = gdbtypes.h
inf_loop_h = inf-loop.h
inferior_h = inferior.h $(breakpoint_h)
memattr_h = memattr.h
parser_defs_h = parser-defs.h
parser_defs_h = parser-defs.h $(doublest_h)
regcache_h = regcache.h
remote_h = remote.h
remote_utils_h = remote-utils.h $(target_h)
@ -616,7 +617,7 @@ target_h = target.h $(bfd_h) $(symtab_h) $(dcache_h) $(memattr_h)
top_h = top.h
tracepoint_h = tracepoint.h
ui_out_h = ui-out.h
value_h = value.h $(symtab_h) $(gdbtypes_h) $(expression_h)
value_h = value.h $(symtab_h) $(gdbtypes_h) $(expression_h) $(doublest_h)
version_h = version.h
# Header files that need to have srcdir added. Note that in the cases
@ -693,7 +694,9 @@ COMMON_OBS = version.o blockframe.o breakpoint.o findvar.o regcache.o \
c-valprint.o cp-valprint.o ch-valprint.o f-valprint.o m2-valprint.o \
nlmread.o serial.o mdebugread.o os9kread.o top.o utils.o \
ui-file.o \
frame.o \
frame.o doublest.o \
ui-file.o \
frame.o doublest.o \
gnu-v2-abi.o gnu-v3-abi.o hpacc-abi.o cp-abi.o
OBS = $(COMMON_OBS) $(ANNOTATE_OBS)
@ -1201,8 +1204,8 @@ alpha-nat.o: alpha-nat.c $(defs_h) $(gdbcore_h) $(inferior_h) $(target_h) \
$(regcache_h)
alpha-tdep.o: alpha-tdep.c $(defs_h) $(gdbcmd_h) $(gdbcore_h) \
$(inferior_h) $(symtab_h) $(dis_asm_h) $(gdb_string_h) linespec.h \
$(regcache_h)
$(inferior_h) $(symtab_h) $(dis-asm.h) $(gdb_string_h) linespec.h \
$(regcache_h) $(doublest_h)
annotate.o: annotate.c $(defs_h) $(annotate_h) $(value_h) $(target_h) $(gdbtypes_h)
@ -1210,10 +1213,10 @@ arm-linux-nat.o: arm-linux-nat.c $(defs_h) $(inferior_h) $(gdbcore_h) \
$(gdb_string_h) $(regcache_h)
arm-linux-tdep.o: arm-linux-tdep.c $(defs_h) $(target_h) $(value_h) \
$(gdbtypes_h) $(floatformat_h) $(regcache_h)
$(gdbtypes_h) $(floatformat_h) $(regcache_h) $(doublest_h)
arm-tdep.o: arm-tdep.c $(gdbcmd_h) $(gdbcore_h) $(inferior_h) $(defs_h) \
$(gdbcore_h) $(regcache_h)
$(gdbcore_h) $(regcache_h) $(doublest_h)
bcache.o: bcache.c bcache.h $(defs_h)
@ -1237,6 +1240,9 @@ c-typeprint.o: c-typeprint.c c-lang.h $(defs_h) $(expression_h) \
c-valprint.o: c-valprint.c $(defs_h) $(expression_h) $(gdbtypes_h) \
language.h $(symtab_h) valprint.h $(value_h) $(cp_abi_h)
doublest.o: doublest.c $(defs_h) $(doublest_h) $(floatformat_h) \
gdb_assert.h gdb_string.h
f-lang.o: f-lang.c f-lang.h $(defs_h) $(expression_h) $(gdbtypes_h) \
language.h $(parser_defs_h) $(symtab_h) $(gdb_string_h)
@ -1522,7 +1528,8 @@ i386gnu-nat.o: gnu-nat.h
i386-tdep.o: i386-tdep.c $(defs_h) $(gdb_string_h) $(frame_h) \
$(inferior_h) $(gdbcore_h) $(target_h) $(floatformat_h) \
$(symtab_h) $(gdbcmd_h) $(command_h) $(arch_utils_h) $(regcache_h)
$(symtab_h) $(gdbcmd_h) $(command_h) $(arch_utils_h) $(regcache_h) \
$(doublest_h)
i386-nat.o: i386-nat.c $(defs_h) $(breakpoint_h) $(command_h) $(gdbcmd_h)
@ -1561,7 +1568,7 @@ i386-linux-tdep.o: i386-linux-tdep.c $(defs_h) $(gdbcore_h) $(frame_h) \
i386v4-nat.o: i386v4-nat.c $(defs_h) $(regcache_h)
i387-tdep.o: i387-tdep.c $(floatformat_h) $(defs_h) $(gdbcore_h) \
$(inferior_h) language.h $(regcache_h)
$(inferior_h) language.h $(regcache_h) $(doublest_h)
i960-tdep.o: i960-tdep.c $(floatformat_h) $(defs_h) $(expression_h) \
$(frame_h) $(gdbtypes_h) $(symtab_h) $(value_h) $(gdbcore_h) \
@ -1574,7 +1581,7 @@ ia64-linux-tdep.o: ia64-linux-tdep.c $(defs_h) $(arch_utils_h)
ia64-tdep.o: ia64-tdep.c $(defs_h) $(inferior_h) $(symfile_h) $(gdbcore_h) \
$(arch_utils_h) $(floatformat_h) objfiles.h \
$(INCLUDE_DIR)/elf/common.h $(regcache_h)
$(INCLUDE_DIR)/elf/common.h $(regcache_h) $(doublest_h)
infcmd.o: infcmd.c $(defs_h) environ.h $(gdbcmd_h) $(gdbcore_h) \
$(inferior_h) $(target_h) language.h $(symfile_h) $(gdb_string_h) \
@ -1771,7 +1778,7 @@ hp-symtab-read.o: hp-symtab-read.c hpread.h $(bfd_h) buildsym.h complaints.h \
parse.o: parse.c $(command_h) $(defs_h) $(expression_h) $(frame_h) \
$(gdbtypes_h) language.h $(parser_defs_h) $(symtab_h) $(value_h) \
$(gdb_string_h) linespec.h
$(gdb_string_h) linespec.h $(doublest_h)
ppc-bdm.o: ppc-bdm.c $(defs_h) $(gdbcore_h) $(gdb_string_h) $(frame_h) \
$(inferior_h) $(bfd_h) $(symfile_h) $(target_h) $(gdbcmd_h) \
@ -1956,7 +1963,7 @@ serial.o: serial.c $(defs_h) serial.h $(gdb_string_h)
sh-tdep.o: sh-tdep.c $(bfd_h) $(dis_asm_h) \
$(srcdir)/../opcodes/sh-opc.h $(defs_h) $(expression_h) $(frame_h) \
$(gdbcmd_h) $(gdbtypes_h) $(symtab_h) $(value_h) $(arch_utils_h) \
$(regcache_h)
$(regcache_h) $(doublest_h)
sh3-rom.o: sh3-rom.c monitor.h $(bfd_h) gdb_wait.h $(defs_h) $(gdbcmd_h) \
$(inferior_h) $(target_h) serial.h terminal.h $(arch_utils_h) \
@ -1995,7 +2002,7 @@ dsrec.o: dsrec.c $(defs_h) srec.h
stabsread.o: stabsread.c $(bfd_h) $(INCLUDE_DIR)/aout/stab.def \
$(INCLUDE_DIR)/aout/stab_gnu.h buildsym.h complaints.h $(defs_h) \
$(gdbtypes_h) objfiles.h stabsread.h $(symfile_h) $(symtab_h) \
$(gdb_string_h)
$(gdb_string_h) $(doublest_h)
stack.o: stack.c $(defs_h) $(gdbcmd_h) $(gdbcore_h) $(inferior_h) \
language.h $(target_h) $(gdb_string_h) $(ui_out_h)
@ -2050,7 +2057,7 @@ top.o: top.c top.h $(bfd_h) $(getopt_h) $(readline_headers) call-cmds.h \
$(cli_cmds_h) $(cli_script_h) $(cli_setshow_h) \
$(defs_h) $(gdbcmd_h) $(inferior_h) language.h \
$(remote_utils_h) $(gdb_string_h) $(event_loop_h) $(event_top_h) \
$(completer_h) $(version_h) $(ui_out_h) \
$(completer_h) $(version_h) $(ui_out_h) $(doublest_h) \
serial.h
typeprint.o: typeprint.c $(defs_h) $(expression_h) $(gdbcmd_h) \
@ -2069,18 +2076,18 @@ utils.o: utils.c $(bfd_h) $(defs_h) $(expression_h) $(gdbcmd_h) \
valarith.o: valarith.c $(bfd_h) $(defs_h) $(expression_h) \
$(gdbtypes_h) language.h $(symtab_h) $(target_h) $(value_h) \
$(gdb_string_h)
$(gdb_string_h) $(doublest_h)
valops.o: valops.c $(defs_h) $(gdbcore_h) $(inferior_h) $(target_h) \
$(gdb_string_h) $(regcache_h) $(cp_abi_h)
valprint.o: valprint.c $(defs_h) $(expression_h) $(gdbcmd_h) \
$(gdbcore_h) $(gdbtypes_h) language.h $(symtab_h) $(target_h) \
$(value_h) $(gdb_string_h) valprint.h
$(value_h) $(gdb_string_h) valprint.h $(doublest_h)
values.o: values.c $(defs_h) $(expression_h) $(frame_h) $(gdbcmd_h) \
$(gdbcore_h) $(gdbtypes_h) $(symtab_h) $(target_h) $(value_h) \
$(gdb_string_h) scm-lang.h
$(gdb_string_h) scm-lang.h $(doublest_h)
vax-tdep.o: vax-tdep.c $(OP_INCLUDE)/vax.h $(defs_h) $(symtab_h)

1
gdb/alpha-tdep.c
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@ -32,6 +32,7 @@
#include "gdb_string.h"
#include "linespec.h"
#include "regcache.h"
#include "doublest.h"
/* FIXME: Some of this code should perhaps be merged with mips-tdep.c. */

1
gdb/arm-linux-tdep.c
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@ -26,6 +26,7 @@
#include "gdbcore.h"
#include "frame.h"
#include "regcache.h"
#include "doublest.h"
/* For arm_linux_skip_solib_resolver. */
#include "symtab.h"

1
gdb/arm-tdep.c
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@ -30,6 +30,7 @@
#include "dis-asm.h" /* For register flavors. */
#include <ctype.h> /* for isupper () */
#include "regcache.h"
#include "doublest.h"
/* Each OS has a different mechanism for accessing the various
registers stored in the sigcontext structure.

2
gdb/ax.h
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@ -21,6 +21,8 @@
#ifndef AGENTEXPR_H
#define AGENTEXPR_H
#include "doublest.h" /* For DOUBLEST. */
/* It's sometimes useful to be able to debug programs that you can't
really stop for more than a fraction of a second. To this end, the
user can specify a tracepoint (like a breakpoint, but you don't

1
gdb/config/i386/tm-symmetry.h
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@ -25,6 +25,7 @@
#define TM_SYMMETRY_H 1
#include "regcache.h"
#include "doublest.h"
/* I don't know if this will work for cross-debugging, even if you do get
a copy of the right include file. */

2
gdb/config/i960/tm-i960.h
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@ -25,6 +25,8 @@
#define I80960
#endif
#include "doublest.h"
/* Hook for the SYMBOL_CLASS of a parameter when decoding DBX symbol
information. In the i960, parameters can be stored as locals or as
args, depending on the type of the debug record.

1
gdb/config/m88k/tm-m88k.h
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@ -20,6 +20,7 @@
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "doublest.h"
#include "regcache.h"
/* g++ support is not yet included. */

58
gdb/defs.h
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@ -1255,64 +1255,6 @@ extern void store_address (void *, int, LONGEST);
extern void store_typed_address (void *buf, struct type *type, CORE_ADDR addr);
/* Setup definitions for host and target floating point formats. We need to
consider the format for `float', `double', and `long double' for both target
and host. We need to do this so that we know what kind of conversions need
to be done when converting target numbers to and from the hosts DOUBLEST
data type. */
/* This is used to indicate that we don't know the format of the floating point
number. Typically, this is useful for native ports, where the actual format
is irrelevant, since no conversions will be taking place. */
extern const struct floatformat floatformat_unknown;
#if HOST_BYTE_ORDER == BIG_ENDIAN
#ifndef HOST_FLOAT_FORMAT
#define HOST_FLOAT_FORMAT &floatformat_ieee_single_big
#endif
#ifndef HOST_DOUBLE_FORMAT
#define HOST_DOUBLE_FORMAT &floatformat_ieee_double_big
#endif
#else /* LITTLE_ENDIAN */
#ifndef HOST_FLOAT_FORMAT
#define HOST_FLOAT_FORMAT &floatformat_ieee_single_little
#endif
#ifndef HOST_DOUBLE_FORMAT
#define HOST_DOUBLE_FORMAT &floatformat_ieee_double_little
#endif
#endif
#ifndef HOST_LONG_DOUBLE_FORMAT
#define HOST_LONG_DOUBLE_FORMAT &floatformat_unknown
#endif
/* Use `long double' if the host compiler supports it. (Note that this is not
necessarily any longer than `double'. On SunOS/gcc, it's the same as
double.) This is necessary because GDB internally converts all floating
point values to the widest type supported by the host.
There are problems however, when the target `long double' is longer than the
host's `long double'. In general, we'll probably reduce the precision of
any such values and print a warning. */
#ifdef HAVE_LONG_DOUBLE
typedef long double DOUBLEST;
#else
typedef double DOUBLEST;
#endif
extern void floatformat_to_doublest (const struct floatformat *,
char *, DOUBLEST *);
extern void floatformat_from_doublest (const struct floatformat *,
DOUBLEST *, char *);
extern int floatformat_is_negative (const struct floatformat *, char *);
extern int floatformat_is_nan (const struct floatformat *, char *);
extern char *floatformat_mantissa (const struct floatformat *, char *);
extern DOUBLEST extract_floating (void *, int);
extern void store_floating (void *, int, DOUBLEST);
/* From valops.c */

627
gdb/doublest.c Normal file
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@ -0,0 +1,627 @@
/* Floating point routines for GDB, the GNU debugger.
Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
1997, 1998, 1999, 2000, 2001
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Support for converting target fp numbers into host DOUBLEST format. */
/* XXX - This code should really be in libiberty/floatformat.c,
however configuration issues with libiberty made this very
difficult to do in the available time. */
#include "defs.h"
#include "doublest.h"
#include "floatformat.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include <math.h> /* ldexp */
/* 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
static unsigned long get_field (unsigned char *,
enum floatformat_byteorders,
unsigned int, unsigned int, unsigned int);
/* Extract a field which starts at START and is LEN bytes long. DATA and
TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */
static unsigned long
get_field (unsigned char *data, enum floatformat_byteorders order,
unsigned int total_len, unsigned int start, unsigned int len)
{
unsigned long result;
unsigned int cur_byte;
int cur_bitshift;
/* Start at the least significant part of the field. */
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
{
/* We start counting from the other end (i.e, from the high bytes
rather than the low bytes). As such, we need to be concerned
with what happens if bit 0 doesn't start on a byte boundary.
I.e, we need to properly handle the case where total_len is
not evenly divisible by 8. So we compute ``excess'' which
represents the number of bits from the end of our starting
byte needed to get to bit 0. */
int excess = FLOATFORMAT_CHAR_BIT - (total_len % FLOATFORMAT_CHAR_BIT);
cur_byte = (total_len / FLOATFORMAT_CHAR_BIT)
- ((start + len + excess) / FLOATFORMAT_CHAR_BIT);
cur_bitshift = ((start + len + excess) % FLOATFORMAT_CHAR_BIT)
- FLOATFORMAT_CHAR_BIT;
}
else
{
cur_byte = (start + len) / FLOATFORMAT_CHAR_BIT;
cur_bitshift =
((start + len) % FLOATFORMAT_CHAR_BIT) - FLOATFORMAT_CHAR_BIT;
}
if (cur_bitshift > -FLOATFORMAT_CHAR_BIT)
result = *(data + cur_byte) >> (-cur_bitshift);
else
result = 0;
cur_bitshift += FLOATFORMAT_CHAR_BIT;
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
++cur_byte;
else
--cur_byte;
/* Move towards the most significant part of the field. */
while (cur_bitshift < len)
{
result |= (unsigned long)*(data + cur_byte) << cur_bitshift;
cur_bitshift += FLOATFORMAT_CHAR_BIT;
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
++cur_byte;
else
--cur_byte;
}
if (len < sizeof(result) * FLOATFORMAT_CHAR_BIT)
/* Mask out bits which are not part of the field */
result &= ((1UL << len) - 1);
return result;
}
/* Convert from FMT to a DOUBLEST.
FROM is the address of the extended float.
Store the DOUBLEST in *TO. */
void
floatformat_to_doublest (const struct floatformat *fmt, char *from,
DOUBLEST *to)
{
unsigned char *ufrom = (unsigned char *) from;
DOUBLEST 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 */
/* If the mantissa bits are not contiguous from one end of the
mantissa to the other, we need to make a private copy of the
source bytes that is in the right order since the unpacking
algorithm assumes that the bits are contiguous.
Swap the bytes individually rather than accessing them through
"long *" since we have no guarantee that they start on a long
alignment, and also sizeof(long) for the host could be different
than sizeof(long) for the target. FIXME: Assumes sizeof(long)
for the target is 4. */
if (fmt->byteorder == floatformat_littlebyte_bigword)
{
static unsigned char *newfrom;
unsigned char *swapin, *swapout;
int longswaps;
longswaps = fmt->totalsize / FLOATFORMAT_CHAR_BIT;
longswaps >>= 3;
if (newfrom == NULL)
{
newfrom = (unsigned char *) xmalloc (fmt->totalsize);
}
swapout = newfrom;
swapin = ufrom;
ufrom = newfrom;
while (longswaps-- > 0)
{
/* This is ugly, but efficient */
*swapout++ = swapin[4];
*swapout++ = swapin[5];
*swapout++ = swapin[6];
*swapout++ = swapin[7];
*swapout++ = swapin[0];
*swapout++ = swapin[1];
*swapout++ = swapin[2];
*swapout++ = swapin[3];
swapin += 8;
}
}
exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize,
fmt->exp_start, fmt->exp_len);
/* Note that if exponent indicates a NaN, we can't really do anything useful
(not knowing if the host has NaN's, or how to build one). So it will
end up as an infinity or something close; that is OK. */
mant_bits_left = fmt->man_len;
mant_off = fmt->man_start;
dto = 0.0;
special_exponent = exponent == 0 || exponent == fmt->exp_nan;
/* Don't bias NaNs. Use minimum exponent for denorms. For simplicity,
we don't check for zero as the exponent doesn't matter. */
if (!special_exponent)
exponent -= fmt->exp_bias;
else if (exponent == 0)
exponent = 1 - 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);
dto += ldexp ((double) mant, exponent - mant_bits);
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 bytes 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 cur_bitshift;
/* Start at the least significant part of the field. */
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
{
int excess = FLOATFORMAT_CHAR_BIT - (total_len % FLOATFORMAT_CHAR_BIT);
cur_byte = (total_len / FLOATFORMAT_CHAR_BIT)
- ((start + len + excess) / FLOATFORMAT_CHAR_BIT);
cur_bitshift = ((start + len + excess) % FLOATFORMAT_CHAR_BIT)
- FLOATFORMAT_CHAR_BIT;
}
else
{
cur_byte = (start + len) / FLOATFORMAT_CHAR_BIT;
cur_bitshift =
((start + len) % FLOATFORMAT_CHAR_BIT) - FLOATFORMAT_CHAR_BIT;
}
if (cur_bitshift > -FLOATFORMAT_CHAR_BIT)
{
*(data + cur_byte) &=
~(((1 << ((start + len) % FLOATFORMAT_CHAR_BIT)) - 1)
<< (-cur_bitshift));
*(data + cur_byte) |=
(stuff_to_put & ((1 << FLOATFORMAT_CHAR_BIT) - 1)) << (-cur_bitshift);
}
cur_bitshift += FLOATFORMAT_CHAR_BIT;
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
++cur_byte;
else
--cur_byte;
/* Move towards the most significant part of the field. */
while (cur_bitshift < len)
{
if (len - cur_bitshift < FLOATFORMAT_CHAR_BIT)
{
/* This is the last byte. */
*(data + cur_byte) &=
~((1 << (len - cur_bitshift)) - 1);
*(data + cur_byte) |= (stuff_to_put >> cur_bitshift);
}
else
*(data + cur_byte) = ((stuff_to_put >> cur_bitshift)
& ((1 << FLOATFORMAT_CHAR_BIT) - 1));
cur_bitshift += FLOATFORMAT_CHAR_BIT;
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
++cur_byte;
else
--cur_byte;
}
}
#ifdef HAVE_LONG_DOUBLE
/* Return the fractional part of VALUE, and put the exponent of VALUE in *EPTR.
The range of the returned value is >= 0.5 and < 1.0. This is equivalent to
frexp, but operates on the long double data type. */
static long double ldfrexp (long double value, int *eptr);
static long double
ldfrexp (long double value, int *eptr)
{
long double tmp;
int exp;
/* Unfortunately, there are no portable functions for extracting the exponent
of a long double, so we have to do it iteratively by multiplying or dividing
by two until the fraction is between 0.5 and 1.0. */
if (value < 0.0l)
value = -value;
tmp = 1.0l;
exp = 0;
if (value >= tmp) /* Value >= 1.0 */
while (value >= tmp)
{
tmp *= 2.0l;
exp++;
}
else if (value != 0.0l) /* Value < 1.0 and > 0.0 */
{
while (value < tmp)
{
tmp /= 2.0l;
exp--;
}
tmp *= 2.0l;
exp++;
}
*eptr = exp;
return value / tmp;
}
#endif /* HAVE_LONG_DOUBLE */
/* The converse: convert the DOUBLEST *FROM to an extended float
and store where TO points. Neither FROM nor TO have any alignment
restrictions. */
void
floatformat_from_doublest (CONST struct floatformat *fmt, DOUBLEST *from,
char *to)
{
DOUBLEST dfrom;
int exponent;
DOUBLEST mant;
unsigned int mant_bits, mant_off;
int mant_bits_left;
unsigned char *uto = (unsigned char *) to;
memcpy (&dfrom, from, sizeof (dfrom));
memset (uto, 0, (fmt->totalsize + FLOATFORMAT_CHAR_BIT - 1)
/ FLOATFORMAT_CHAR_BIT);
if (dfrom == 0)
return; /* Result is zero */
if (dfrom != dfrom) /* Result is NaN */
{
/* From is 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 irrel */
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->man_start,
32, 1);
return;
}
/* 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 + dfrom == dfrom && dfrom != 0.0) /* Result is Infinity */
{
/* Infinity exponent is same as NaN's. */
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start,
fmt->exp_len, fmt->exp_nan);
/* Infinity mantissa is all zeroes. */
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->man_start,
fmt->man_len, 0);
return;
}
#ifdef HAVE_LONG_DOUBLE
mant = ldfrexp (dfrom, &exponent);
#else
mant = frexp (dfrom, &exponent);
#endif
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, fmt->exp_len,
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) & 0xffffffffL;
mant -= mant_long;
/* If the integer bit is implicit, then we need to discard it.
If we are discarding a zero, we should be (but are not) creating
a denormalized number which means adjusting the exponent
(I think). */
if (mant_bits_left == fmt->man_len
&& fmt->intbit == floatformat_intbit_no)
{
mant_long <<= 1;
mant_long &= 0xffffffffL;
mant_bits -= 1;
}
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;
}
if (fmt->byteorder == floatformat_littlebyte_bigword)
{
int count;
unsigned char *swaplow = uto;
unsigned char *swaphigh = uto + 4;
unsigned char tmp;
for (count = 0; count < 4; count++)
{
tmp = *swaplow;
*swaplow++ = *swaphigh;
*swaphigh++ = tmp;
}
}
}
/* Check if VAL (which is assumed to be a floating point number whose
format is described by FMT) is negative. */
int
floatformat_is_negative (const struct floatformat *fmt, char *val)
{
unsigned char *uval = (unsigned char *) val;
return get_field (uval, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1);
}
/* Check if VAL is "not a number" (NaN) for FMT. */
int
floatformat_is_nan (const struct floatformat *fmt, char *val)
{
unsigned char *uval = (unsigned char *) val;
long exponent;
unsigned long mant;
unsigned int mant_bits, mant_off;
int mant_bits_left;
if (! fmt->exp_nan)
return 0;
exponent = get_field (uval, fmt->byteorder, fmt->totalsize,
fmt->exp_start, fmt->exp_len);
if (exponent != fmt->exp_nan)
return 0;
mant_bits_left = fmt->man_len;
mant_off = fmt->man_start;
while (mant_bits_left > 0)
{
mant_bits = min (mant_bits_left, 32);
mant = get_field (uval, fmt->byteorder, fmt->totalsize,
mant_off, mant_bits);
/* If there is an explicit integer bit, mask it off. */
if (mant_off == fmt->man_start
&& fmt->intbit == floatformat_intbit_yes)
mant &= ~(1 << (mant_bits - 1));
if (mant)
return 1;
mant_off += mant_bits;
mant_bits_left -= mant_bits;
}
return 0;
}
/* Convert the mantissa of VAL (which is assumed to be a floating
point number whose format is described by FMT) into a hexadecimal
and store it in a static string. Return a pointer to that string. */
char *
floatformat_mantissa (const struct floatformat *fmt, char *val)
{
unsigned char *uval = (unsigned char *) val;
unsigned long mant;
unsigned int mant_bits, mant_off;
int mant_bits_left;
static char res[50];
char buf[9];
/* Make sure we have enough room to store the mantissa. */
gdb_assert (sizeof res > ((fmt->man_len + 7) / 8) * 2);
mant_off = fmt->man_start;
mant_bits_left = fmt->man_len;
mant_bits = (mant_bits_left % 32) > 0 ? mant_bits_left % 32 : 32;
mant = get_field (uval, fmt->byteorder, fmt->totalsize,
mant_off, mant_bits);
sprintf (res, "%lx", mant);
mant_off += mant_bits;
mant_bits_left -= mant_bits;
while (mant_bits_left > 0)
{
mant = get_field (uval, fmt->byteorder, fmt->totalsize,
mant_off, 32);
sprintf (buf, "%08lx", mant);
strcat (res, buf);
mant_off += 32;
mant_bits_left -= 32;
}
return res;
}
/* Extract a floating-point number from a target-order byte-stream at ADDR.
Returns the value as type DOUBLEST.
If the host and target formats agree, we just copy the raw data into the
appropriate type of variable and return, letting the host increase precision
as necessary. Otherwise, we call the conversion routine and let it do the
dirty work. */
DOUBLEST
extract_floating (void *addr, int len)
{
DOUBLEST dretval;
if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT)
{
if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
{
float retval;
memcpy (&retval, addr, sizeof (retval));
return retval;
}
else
floatformat_to_doublest (TARGET_FLOAT_FORMAT, addr, &dretval);
}
else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT)
{
if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
{
double retval;
memcpy (&retval, addr, sizeof (retval));
return retval;
}
else
floatformat_to_doublest (TARGET_DOUBLE_FORMAT, addr, &dretval);
}
else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT)
{
if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
{
DOUBLEST retval;
memcpy (&retval, addr, sizeof (retval));
return retval;
}
else
floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, &dretval);
}
else
{
error ("Can't deal with a floating point number of %d bytes.", len);
}
return dretval;
}
void
store_floating (void *addr, int len, DOUBLEST val)
{
if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT)
{
if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
{
float floatval = val;
memcpy (addr, &floatval, sizeof (floatval));
}
else
floatformat_from_doublest (TARGET_FLOAT_FORMAT, &val, addr);
}
else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT)
{
if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
{
double doubleval = val;
memcpy (addr, &doubleval, sizeof (doubleval));
}
else
floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &val, addr);
}
else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT)
{
if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
memcpy (addr, &val, sizeof (val));
else
floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr);
}
else
{
error ("Can't deal with a floating point number of %d bytes.", len);
}
}

87
gdb/doublest.h Normal file
View File

@ -0,0 +1,87 @@
/* Floating point definitions for GDB.
Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
1997, 1998, 1999, 2000, 2001
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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef DOUBLEST_H
#define DOUBLEST_H
/* Setup definitions for host and target floating point formats. We need to
consider the format for `float', `double', and `long double' for both target
and host. We need to do this so that we know what kind of conversions need
to be done when converting target numbers to and from the hosts DOUBLEST
data type. */
/* This is used to indicate that we don't know the format of the floating point
number. Typically, this is useful for native ports, where the actual format
is irrelevant, since no conversions will be taking place. */
#include "floatformat.h" /* For struct floatformat */
extern const struct floatformat floatformat_unknown;
#if HOST_BYTE_ORDER == BIG_ENDIAN
#ifndef HOST_FLOAT_FORMAT
#define HOST_FLOAT_FORMAT &floatformat_ieee_single_big
#endif
#ifndef HOST_DOUBLE_FORMAT
#define HOST_DOUBLE_FORMAT &floatformat_ieee_double_big
#endif
#else /* LITTLE_ENDIAN */
#ifndef HOST_FLOAT_FORMAT
#define HOST_FLOAT_FORMAT &floatformat_ieee_single_little
#endif
#ifndef HOST_DOUBLE_FORMAT
#define HOST_DOUBLE_FORMAT &floatformat_ieee_double_little
#endif
#endif
#ifndef HOST_LONG_DOUBLE_FORMAT
#define HOST_LONG_DOUBLE_FORMAT &floatformat_unknown
#endif
/* Use `long double' if the host compiler supports it. (Note that this is not
necessarily any longer than `double'. On SunOS/gcc, it's the same as
double.) This is necessary because GDB internally converts all floating
point values to the widest type supported by the host.
There are problems however, when the target `long double' is longer than the
host's `long double'. In general, we'll probably reduce the precision of
any such values and print a warning. */
#ifdef HAVE_LONG_DOUBLE
typedef long double DOUBLEST;
#else
typedef double DOUBLEST;
#endif
extern void floatformat_to_doublest (const struct floatformat *,
char *, DOUBLEST *);
extern void floatformat_from_doublest (const struct floatformat *,
DOUBLEST *, char *);
extern int floatformat_is_negative (const struct floatformat *, char *);
extern int floatformat_is_nan (const struct floatformat *, char *);
extern char *floatformat_mantissa (const struct floatformat *, char *);
extern DOUBLEST extract_floating (void *, int);
extern void store_floating (void *, int, DOUBLEST);
#endif

1
gdb/expression.h
View File

@ -23,6 +23,7 @@
#include "symtab.h" /* Needed for "struct block" type. */
#include "doublest.h" /* Needed for DOUBLEST. */
/* Definitions for saved C expressions. */

96
gdb/findvar.c
View File

@ -288,102 +288,6 @@ store_typed_address (void *buf, struct type *type, CORE_ADDR addr)
/* Extract a floating-point number from a target-order byte-stream at ADDR.
Returns the value as type DOUBLEST.
If the host and target formats agree, we just copy the raw data into the
appropriate type of variable and return, letting the host increase precision
as necessary. Otherwise, we call the conversion routine and let it do the
dirty work. */
DOUBLEST
extract_floating (void *addr, int len)
{
DOUBLEST dretval;
if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT)
{
if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
{
float retval;
memcpy (&retval, addr, sizeof (retval));
return retval;
}
else
floatformat_to_doublest (TARGET_FLOAT_FORMAT, addr, &dretval);
}
else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT)
{
if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
{
double retval;
memcpy (&retval, addr, sizeof (retval));
return retval;
}
else
floatformat_to_doublest (TARGET_DOUBLE_FORMAT, addr, &dretval);
}
else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT)
{
if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
{
DOUBLEST retval;
memcpy (&retval, addr, sizeof (retval));
return retval;
}
else
floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, &dretval);
}
else
{
error ("Can't deal with a floating point number of %d bytes.", len);
}
return dretval;
}
void
store_floating (void *addr, int len, DOUBLEST val)
{
if (len * TARGET_CHAR_BIT == TARGET_FLOAT_BIT)
{
if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
{
float floatval = val;
memcpy (addr, &floatval, sizeof (floatval));
}
else
floatformat_from_doublest (TARGET_FLOAT_FORMAT, &val, addr);
}
else if (len * TARGET_CHAR_BIT == TARGET_DOUBLE_BIT)
{
if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
{
double doubleval = val;
memcpy (addr, &doubleval, sizeof (doubleval));
}
else
floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &val, addr);
}
else if (len * TARGET_CHAR_BIT == TARGET_LONG_DOUBLE_BIT)
{
if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
memcpy (addr, &val, sizeof (val));
else
floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr);
}
else
{
error ("Can't deal with a floating point number of %d bytes.", len);
}
}
/* Return a `value' with the contents of register REGNUM
in its virtual format, with the type specified by
REGISTER_VIRTUAL_TYPE.

1
gdb/i386-tdep.c
View File

@ -32,6 +32,7 @@
#include "command.h"
#include "arch-utils.h"
#include "regcache.h"
#include "doublest.h"
#include "gdb_assert.h"

1
gdb/i387-tdep.c
View File

@ -28,6 +28,7 @@
#include "floatformat.h"
#include "regcache.h"
#include "gdb_assert.h"
#include "doublest.h"
/* FIXME: Eliminate the next two functions when we have the time to

1
gdb/ia64-tdep.c
View File

@ -26,6 +26,7 @@
#include "arch-utils.h"
#include "floatformat.h"
#include "regcache.h"
#include "doublest.h"
#include "objfiles.h"
#include "elf/common.h" /* for DT_PLTGOT value */

1
gdb/parse.c
View File

@ -46,6 +46,7 @@
#include "symfile.h" /* for overlay functions */
#include "inferior.h" /* for NUM_PSEUDO_REGS. NOTE: replace
with "gdbarch.h" when appropriate. */
#include "doublest.h"
/* Symbols which architectures can redefine. */

2
gdb/parser-defs.h
View File

@ -24,6 +24,8 @@
#if !defined (PARSER_DEFS_H)
#define PARSER_DEFS_H 1
#include "doublest.h"
struct std_regs
{
char *name;

1
gdb/rs6000-tdep.c
View File

@ -31,6 +31,7 @@
#include "objfiles.h"
#include "arch-utils.h"
#include "regcache.h"
#include "doublest.h"
#include "bfd/libbfd.h" /* for bfd_default_set_arch_mach */
#include "coff/internal.h" /* for libcoff.h */

1
gdb/sh-tdep.c
View File

@ -39,6 +39,7 @@
#include "arch-utils.h"
#include "floatformat.h"
#include "regcache.h"
#include "doublest.h"
#include "solib-svr4.h"

1
gdb/stabsread.c
View File

@ -43,6 +43,7 @@
#include "complaints.h"
#include "demangle.h"
#include "language.h"
#include "doublest.h"
#include <ctype.h>

1
gdb/top.c
View File

@ -40,6 +40,7 @@
#include "top.h"
#include "version.h"
#include "serial.h"
#include "doublest.h"
/* readline include files */
#include <readline/readline.h>

505
gdb/utils.c
View File

@ -2326,511 +2326,6 @@ initialize_utils (void)
#ifdef SIGWINCH_HANDLER_BODY
SIGWINCH_HANDLER_BODY
#endif
/* Support for converting target fp numbers into host DOUBLEST format. */
/* XXX - This code should really be in libiberty/floatformat.c, however
configuration issues with libiberty made this very difficult to do in the
available time. */
#include "floatformat.h"
#include <math.h> /* ldexp */
/* 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
static unsigned long get_field (unsigned char *,
enum floatformat_byteorders,
unsigned int, unsigned int, unsigned int);
/* Extract a field which starts at START and is LEN bytes long. DATA and
TOTAL_LEN are the thing we are extracting it from, in byteorder ORDER. */
static unsigned long
get_field (unsigned char *data, enum floatformat_byteorders order,
unsigned int total_len, unsigned int start, unsigned int len)
{
unsigned long result;
unsigned int cur_byte;
int cur_bitshift;
/* Start at the least significant part of the field. */
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
{
/* We start counting from the other end (i.e, from the high bytes
rather than the low bytes). As such, we need to be concerned
with what happens if bit 0 doesn't start on a byte boundary.
I.e, we need to properly handle the case where total_len is
not evenly divisible by 8. So we compute ``excess'' which
represents the number of bits from the end of our starting
byte needed to get to bit 0. */
int excess = FLOATFORMAT_CHAR_BIT - (total_len % FLOATFORMAT_CHAR_BIT);
cur_byte = (total_len / FLOATFORMAT_CHAR_BIT)
- ((start + len + excess) / FLOATFORMAT_CHAR_BIT);
cur_bitshift = ((start + len + excess) % FLOATFORMAT_CHAR_BIT)
- FLOATFORMAT_CHAR_BIT;
}
else
{
cur_byte = (start + len) / FLOATFORMAT_CHAR_BIT;
cur_bitshift =
((start + len) % FLOATFORMAT_CHAR_BIT) - FLOATFORMAT_CHAR_BIT;
}
if (cur_bitshift > -FLOATFORMAT_CHAR_BIT)
result = *(data + cur_byte) >> (-cur_bitshift);
else
result = 0;
cur_bitshift += FLOATFORMAT_CHAR_BIT;
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
++cur_byte;
else
--cur_byte;
/* Move towards the most significant part of the field. */
while (cur_bitshift < len)
{
result |= (unsigned long)*(data + cur_byte) << cur_bitshift;
cur_bitshift += FLOATFORMAT_CHAR_BIT;
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
++cur_byte;
else
--cur_byte;
}
if (len < sizeof(result) * FLOATFORMAT_CHAR_BIT)
/* Mask out bits which are not part of the field */
result &= ((1UL << len) - 1);
return result;
}
/* Convert from FMT to a DOUBLEST.
FROM is the address of the extended float.
Store the DOUBLEST in *TO. */
void
floatformat_to_doublest (const struct floatformat *fmt, char *from,
DOUBLEST *to)
{
unsigned char *ufrom = (unsigned char *) from;
DOUBLEST 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 */
/* If the mantissa bits are not contiguous from one end of the
mantissa to the other, we need to make a private copy of the
source bytes that is in the right order since the unpacking
algorithm assumes that the bits are contiguous.
Swap the bytes individually rather than accessing them through
"long *" since we have no guarantee that they start on a long
alignment, and also sizeof(long) for the host could be different
than sizeof(long) for the target. FIXME: Assumes sizeof(long)
for the target is 4. */
if (fmt->byteorder == floatformat_littlebyte_bigword)
{
static unsigned char *newfrom;
unsigned char *swapin, *swapout;
int longswaps;
longswaps = fmt->totalsize / FLOATFORMAT_CHAR_BIT;
longswaps >>= 3;
if (newfrom == NULL)
{
newfrom = (unsigned char *) xmalloc (fmt->totalsize);
}
swapout = newfrom;
swapin = ufrom;
ufrom = newfrom;
while (longswaps-- > 0)
{
/* This is ugly, but efficient */
*swapout++ = swapin[4];
*swapout++ = swapin[5];
*swapout++ = swapin[6];
*swapout++ = swapin[7];
*swapout++ = swapin[0];
*swapout++ = swapin[1];
*swapout++ = swapin[2];
*swapout++ = swapin[3];
swapin += 8;
}
}
exponent = get_field (ufrom, fmt->byteorder, fmt->totalsize,
fmt->exp_start, fmt->exp_len);
/* Note that if exponent indicates a NaN, we can't really do anything useful
(not knowing if the host has NaN's, or how to build one). So it will
end up as an infinity or something close; that is OK. */
mant_bits_left = fmt->man_len;
mant_off = fmt->man_start;
dto = 0.0;
special_exponent = exponent == 0 || exponent == fmt->exp_nan;
/* Don't bias NaNs. Use minimum exponent for denorms. For simplicity,
we don't check for zero as the exponent doesn't matter. */
if (!special_exponent)
exponent -= fmt->exp_bias;
else if (exponent == 0)
exponent = 1 - 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);
dto += ldexp ((double) mant, exponent - mant_bits);
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 bytes 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 cur_bitshift;
/* Start at the least significant part of the field. */
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
{
int excess = FLOATFORMAT_CHAR_BIT - (total_len % FLOATFORMAT_CHAR_BIT);
cur_byte = (total_len / FLOATFORMAT_CHAR_BIT)
- ((start + len + excess) / FLOATFORMAT_CHAR_BIT);
cur_bitshift = ((start + len + excess) % FLOATFORMAT_CHAR_BIT)
- FLOATFORMAT_CHAR_BIT;
}
else
{
cur_byte = (start + len) / FLOATFORMAT_CHAR_BIT;
cur_bitshift =
((start + len) % FLOATFORMAT_CHAR_BIT) - FLOATFORMAT_CHAR_BIT;
}
if (cur_bitshift > -FLOATFORMAT_CHAR_BIT)
{
*(data + cur_byte) &=
~(((1 << ((start + len) % FLOATFORMAT_CHAR_BIT)) - 1)
<< (-cur_bitshift));
*(data + cur_byte) |=
(stuff_to_put & ((1 << FLOATFORMAT_CHAR_BIT) - 1)) << (-cur_bitshift);
}
cur_bitshift += FLOATFORMAT_CHAR_BIT;
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
++cur_byte;
else
--cur_byte;
/* Move towards the most significant part of the field. */
while (cur_bitshift < len)
{
if (len - cur_bitshift < FLOATFORMAT_CHAR_BIT)
{
/* This is the last byte. */
*(data + cur_byte) &=
~((1 << (len - cur_bitshift)) - 1);
*(data + cur_byte) |= (stuff_to_put >> cur_bitshift);
}
else
*(data + cur_byte) = ((stuff_to_put >> cur_bitshift)
& ((1 << FLOATFORMAT_CHAR_BIT) - 1));
cur_bitshift += FLOATFORMAT_CHAR_BIT;
if (order == floatformat_little || order == floatformat_littlebyte_bigword)
++cur_byte;
else
--cur_byte;
}
}
#ifdef HAVE_LONG_DOUBLE
/* Return the fractional part of VALUE, and put the exponent of VALUE in *EPTR.
The range of the returned value is >= 0.5 and < 1.0. This is equivalent to
frexp, but operates on the long double data type. */
static long double ldfrexp (long double value, int *eptr);
static long double
ldfrexp (long double value, int *eptr)
{
long double tmp;
int exp;
/* Unfortunately, there are no portable functions for extracting the exponent
of a long double, so we have to do it iteratively by multiplying or dividing
by two until the fraction is between 0.5 and 1.0. */
if (value < 0.0l)
value = -value;
tmp = 1.0l;
exp = 0;
if (value >= tmp) /* Value >= 1.0 */
while (value >= tmp)
{
tmp *= 2.0l;
exp++;
}
else if (value != 0.0l) /* Value < 1.0 and > 0.0 */
{
while (value < tmp)
{
tmp /= 2.0l;
exp--;
}
tmp *= 2.0l;
exp++;
}
*eptr = exp;
return value / tmp;
}
#endif /* HAVE_LONG_DOUBLE */
/* The converse: convert the DOUBLEST *FROM to an extended float
and store where TO points. Neither FROM nor TO have any alignment
restrictions. */
void
floatformat_from_doublest (CONST struct floatformat *fmt, DOUBLEST *from,
char *to)
{
DOUBLEST dfrom;
int exponent;
DOUBLEST mant;
unsigned int mant_bits, mant_off;
int mant_bits_left;
unsigned char *uto = (unsigned char *) to;
memcpy (&dfrom, from, sizeof (dfrom));
memset (uto, 0, (fmt->totalsize + FLOATFORMAT_CHAR_BIT - 1)
/ FLOATFORMAT_CHAR_BIT);
if (dfrom == 0)
return; /* Result is zero */
if (dfrom != dfrom) /* Result is NaN */
{
/* From is 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 irrel */
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->man_start,
32, 1);
return;
}
/* 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 + dfrom == dfrom && dfrom != 0.0) /* Result is Infinity */
{
/* Infinity exponent is same as NaN's. */
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start,
fmt->exp_len, fmt->exp_nan);
/* Infinity mantissa is all zeroes. */
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->man_start,
fmt->man_len, 0);
return;
}
#ifdef HAVE_LONG_DOUBLE
mant = ldfrexp (dfrom, &exponent);
#else
mant = frexp (dfrom, &exponent);
#endif
put_field (uto, fmt->byteorder, fmt->totalsize, fmt->exp_start, fmt->exp_len,
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) & 0xffffffffL;
mant -= mant_long;
/* If the integer bit is implicit, then we need to discard it.
If we are discarding a zero, we should be (but are not) creating
a denormalized number which means adjusting the exponent
(I think). */
if (mant_bits_left == fmt->man_len
&& fmt->intbit == floatformat_intbit_no)
{
mant_long <<= 1;
mant_long &= 0xffffffffL;
mant_bits -= 1;
}
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;
}
if (fmt->byteorder == floatformat_littlebyte_bigword)
{
int count;
unsigned char *swaplow = uto;
unsigned char *swaphigh = uto + 4;
unsigned char tmp;
for (count = 0; count < 4; count++)
{
tmp = *swaplow;
*swaplow++ = *swaphigh;
*swaphigh++ = tmp;
}
}
}
/* Check if VAL (which is assumed to be a floating point number whose
format is described by FMT) is negative. */
int
floatformat_is_negative (const struct floatformat *fmt, char *val)
{
unsigned char *uval = (unsigned char *) val;
return get_field (uval, fmt->byteorder, fmt->totalsize, fmt->sign_start, 1);
}
/* Check if VAL is "not a number" (NaN) for FMT. */
int
floatformat_is_nan (const struct floatformat *fmt, char *val)
{
unsigned char *uval = (unsigned char *) val;
long exponent;
unsigned long mant;
unsigned int mant_bits, mant_off;
int mant_bits_left;
if (! fmt->exp_nan)
return 0;
exponent = get_field (uval, fmt->byteorder, fmt->totalsize,
fmt->exp_start, fmt->exp_len);
if (exponent != fmt->exp_nan)
return 0;
mant_bits_left = fmt->man_len;
mant_off = fmt->man_start;
while (mant_bits_left > 0)
{
mant_bits = min (mant_bits_left, 32);
mant = get_field (uval, fmt->byteorder, fmt->totalsize,
mant_off, mant_bits);
/* If there is an explicit integer bit, mask it off. */
if (mant_off == fmt->man_start
&& fmt->intbit == floatformat_intbit_yes)
mant &= ~(1 << (mant_bits - 1));
if (mant)
return 1;
mant_off += mant_bits;
mant_bits_left -= mant_bits;
}
return 0;
}
/* Convert the mantissa of VAL (which is assumed to be a floating
point number whose format is described by FMT) into a hexadecimal
and store it in a static string. Return a pointer to that string. */
char *
floatformat_mantissa (const struct floatformat *fmt, char *val)
{
unsigned char *uval = (unsigned char *) val;
unsigned long mant;
unsigned int mant_bits, mant_off;
int mant_bits_left;
static char res[50];
char buf[9];
/* Make sure we have enough room to store the mantissa. */
gdb_assert (sizeof res > ((fmt->man_len + 7) / 8) * 2);
mant_off = fmt->man_start;
mant_bits_left = fmt->man_len;
mant_bits = (mant_bits_left % 32) > 0 ? mant_bits_left % 32 : 32;
mant = get_field (uval, fmt->byteorder, fmt->totalsize,
mant_off, mant_bits);
sprintf (res, "%lx", mant);
mant_off += mant_bits;
mant_bits_left -= mant_bits;
while (mant_bits_left > 0)
{
mant = get_field (uval, fmt->byteorder, fmt->totalsize,
mant_off, 32);
sprintf (buf, "%08lx", mant);
strcat (res, buf);
mant_off += 32;
mant_bits_left -= 32;
}
return res;
}
/* print routines to handle variable size regs, etc. */

1
gdb/valarith.c
View File

@ -28,6 +28,7 @@
#include "target.h"
#include "language.h"
#include "gdb_string.h"
#include "doublest.h"
#include <math.h>
/* Define whether or not the C operator '/' truncates towards zero for

1
gdb/valprint.c
View File

@ -33,6 +33,7 @@
#include "annotate.h"
#include "valprint.h"
#include "floatformat.h"
#include "doublest.h"
#include <errno.h>

2
gdb/value.h
View File

@ -23,6 +23,8 @@
#if !defined (VALUE_H)
#define VALUE_H 1
#include "doublest.h"
/*
* The structure which defines the type of a value. It should never
* be possible for a program lval value to survive over a call to the inferior

1
gdb/values.c
View File

@ -32,6 +32,7 @@
#include "language.h"
#include "scm-lang.h"
#include "demangle.h"
#include "doublest.h"
/* Prototypes for exported functions. */