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Add --hash-size switch to the linker

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This commit is contained in:
Nick Clifton 2004-05-21 15:38:04 +00:00
parent 8377c19cc4
commit 2d643429de
12 changed files with 131 additions and 22 deletions
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12
bfd/ChangeLog
View File

@ -1,3 +1,15 @@
2004-05-21 Andy Chittenden <achittenden@bluearc.com>
* hash.c (bfd_default_hash_table_size): New variable.
(bfd_hash_table_init): Use new variable instead of DEFAULT_SIZE.
(bfd_hash_set_default_size): New function. Set the default size
to a selected prime number close to the argument. Document new
function.
* bfd-in.h: Add prototype for bfd_hash_set_default_size.
* bfd-in2.h: Regenerate.
* Makefile.am (hash.lo): Add dependency upon libiberty.h.
* Makefile.in: Regenerate.
2004-05-21 Mark Kettenis <kettenis@gnu.org>
* libaout.h (machine_type): Add M_88K_OPENBSD and M_HPPA_OPENBSD.

2
bfd/Makefile.am
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@ -894,7 +894,7 @@ syms.lo: syms.c $(INCDIR)/filenames.h $(INCDIR)/safe-ctype.h \
$(INCDIR)/bfdlink.h $(INCDIR)/aout/stab_gnu.h $(INCDIR)/aout/stab.def
targets.lo: targets.c $(INCDIR)/filenames.h $(INCDIR)/fnmatch.h \
targmatch.h
hash.lo: hash.c $(INCDIR)/filenames.h $(INCDIR)/objalloc.h
hash.lo: hash.c $(INCDIR)/filenames.h $(INCDIR)/objalloc.h $(INCDIR)/libiberty.h
linker.lo: linker.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h \
genlink.h
srec.lo: srec.c $(INCDIR)/filenames.h $(INCDIR)/libiberty.h \

2
bfd/Makefile.in
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@ -1431,7 +1431,7 @@ syms.lo: syms.c $(INCDIR)/filenames.h $(INCDIR)/safe-ctype.h \
$(INCDIR)/bfdlink.h $(INCDIR)/aout/stab_gnu.h $(INCDIR)/aout/stab.def
targets.lo: targets.c $(INCDIR)/filenames.h $(INCDIR)/fnmatch.h \
targmatch.h
hash.lo: hash.c $(INCDIR)/filenames.h $(INCDIR)/objalloc.h
hash.lo: hash.c $(INCDIR)/filenames.h $(INCDIR)/objalloc.h $(INCDIR)/libiberty.h
linker.lo: linker.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h \
genlink.h
srec.lo: srec.c $(INCDIR)/filenames.h $(INCDIR)/libiberty.h \

5
bfd/bfd-in.h
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@ -433,6 +433,11 @@ extern void bfd_hash_traverse
bfd_boolean (*) (struct bfd_hash_entry *, void *),
void *info);
/* Allows the default size of a hash table to be configured. New hash
tables allocated using bfd_hash_table_init will be created with
this size. */
extern void bfd_hash_set_default_size (bfd_size_type);
#define COFF_SWAP_TABLE (void *) &bfd_coff_std_swap_table
/* User program access to BFD facilities. */

5
bfd/bfd-in2.h
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@ -440,6 +440,11 @@ extern void bfd_hash_traverse
bfd_boolean (*) (struct bfd_hash_entry *, void *),
void *info);
/* Allows the default size of a hash table to be configured. New hash
tables allocated using bfd_hash_table_init will be created with
this size. */
extern void bfd_hash_set_default_size (bfd_size_type);
#define COFF_SWAP_TABLE (void *) &bfd_coff_std_swap_table
/* User program access to BFD facilities. */

55
bfd/hash.c
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@ -1,28 +1,29 @@
/* hash.c -- hash table routines for BFD
Copyright 1993, 1994, 1995, 1997, 1999, 2001, 2002, 2003
Copyright 1993, 1994, 1995, 1997, 1999, 2001, 2002, 2003, 2004
Free Software Foundation, Inc.
Written by Steve Chamberlain <sac@cygnus.com>
This file is part of BFD, the Binary File Descriptor library.
This file is part of BFD, the Binary File Descriptor library.
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 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.
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. */
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. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "objalloc.h"
#include "libiberty.h"
/*
SECTION
@ -53,6 +54,7 @@ SECTION
@* Looking Up or Entering a String::
@* Traversing a Hash Table::
@* Deriving a New Hash Table Type::
@* Changing the default Hash Table Size::
@end menu
INODE
@ -87,6 +89,10 @@ SUBSECTION
been allocated for a hash table. This will not free up the
<<struct bfd_hash_table>> itself, which you must provide.
@findex bfd_hash_set_default_size
Use <<bfd_hash_set_default_size>> to set the default size of
hash table to use.
INODE
Looking Up or Entering a String, Traversing a Hash Table, Creating and Freeing a Hash Table, Hash Tables
SUBSECTION
@ -295,7 +301,8 @@ SUBSUBSECTION
*/
/* The default number of entries to use when creating a hash table. */
#define DEFAULT_SIZE (4051)
#define DEFAULT_SIZE 4051
static size_t bfd_default_hash_table_size = DEFAULT_SIZE;
/* Create a new hash table, given a number of entries. */
@ -339,7 +346,7 @@ bfd_hash_table_init (table, newfunc)
struct bfd_hash_table *,
const char *));
{
return bfd_hash_table_init_n (table, newfunc, DEFAULT_SIZE);
return bfd_hash_table_init_n (table, newfunc, bfd_default_hash_table_size);
}
/* Free a hash table. */
@ -495,6 +502,24 @@ bfd_hash_traverse (table, func, info)
}
}
void
bfd_hash_set_default_size (bfd_size_type hash_size)
{
int index;
/* Extend this prime list if you want more granularity of hash table size. */
static bfd_size_type hash_size_primes[] =
{
1021, 4051, 8599, 16699
};
/* Work out best prime number near the hash_size. */
for (index = 0; index < ARRAY_SIZE (hash_size_primes) - 1; ++index)
if (hash_size <= hash_size_primes[index])
break;
bfd_default_hash_table_size = hash_size_primes[index];
}
/* A few different object file formats (a.out, COFF, ELF) use a string
table. These functions support adding strings to a string table,
returning the byte offset, and writing out the table.

15
ld/ChangeLog
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@ -1,3 +1,18 @@
2004-05-21 Andy Chittenden <achittenden@bluearc.com>
* ld.h (ld_config_type): Add new field: hash_table_size.
* ldmain.c: Initialise the new field to zero. If it is non-zero
after parsing the linker's command line call
bfd_hash_set_default_size.
* lexsup.c (option_values): Add OPTION_HASH_SIZE.
(ld_options): Add hash-size.
(parse_args): Parse --hash-size option. Allow
--reduce-memory-overheads to set the default hash table size as
well.
* ld.texinfo: Document the new switch. Also mention that
--reduce-memory-overheads can affect the hash table size.
* NEWS: Mention the new feature.
2004-05-19 J"orn Rennecke <joern.rennecke@superh.com>
* NEWS: Mention new linker map file generation and the

8
ld/NEWS
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@ -1,11 +1,19 @@
-*- text -*-
* A new linker command line switch has been added which allows the hash table
size to be set to a suitable prime value near to its argument. This switch
is --hash-size=<NUMBER>. Also if the switch --reduce-memory-overheads is
used, and --hash-size has not been used, then the default value will be set
to 1021.
* Linker map files are now generated with an O(N) algorithm for finding symbols
that are defined in each section. This uses about 40% more memory for
symbols than the old O(N^2) algorithm. You can use the new
--reduce-memory-overheads option to select the old algorithm; this option
might also be used in the future to select similar tradeoffs.
Changes in 2.15:
* New PE --large-address-aware option to indicate executables support virtual
addresses greater than 2 gigabytes.

5
ld/ld.h
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@ -1,5 +1,5 @@
/* ld.h -- general linker header file
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002
Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2004
Free Software Foundation, Inc.
This file is part of GLD, the Gnu Linker.
@ -241,6 +241,9 @@ typedef struct {
/* If set, only search library directories explicitly selected
on the command line. */
bfd_boolean only_cmd_line_lib_dirs;
/* The size of the hash table to use. */
bfd_size_type hash_table_size;
} ld_config_type;
extern ld_config_type config;

18
ld/ld.texinfo
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@ -1734,13 +1734,27 @@ If you specify @option{--disable-new-dtags}, no new dynamic tags will be
created. By default, the new dynamic tags are not created. Note that
those options are only available for ELF systems.
@kindex --hash-size=@var{number}
Set the default size of the linker's hash tables to a prime number
close to @var{number}. Increasing this value can reduce the length of
time it takes the linker to perform its tasks, at the expense of
increasing the linker's memory requirements. Similarly reducing this
value can reduce the memory requirements at the expense of speed.
@kindex --reduce-memory-overheads
@item --reduce-memory-overheads
This option reduces memory requirements at ld runtime, at the expense of
linking speed. This was introduced to to select the old O(n^2) algorithm
for link map file generation, rather than the new O(n) algorithm which uses
about 40% more memory for symbol storage. It may be also be used for
similar such tradeoffs in the future.
about 40% more memory for symbol storage.
Another affect of the switch is to set the default hash table size to
1021, which again saves memory at the cost of lengthening the linker's
run time. This is not done however if the *option{--hash-size} switch
has been used.
The @option{--reduce-memory-overheads} switch may be also be used to
enable other tradeoffs in future versions of the linker.
@end table

4
ld/ldmain.c
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@ -267,6 +267,7 @@ main (int argc, char **argv)
config.has_shared = FALSE;
config.split_by_reloc = (unsigned) -1;
config.split_by_file = (bfd_size_type) -1;
config.hash_table_size = 0;
command_line.force_common_definition = FALSE;
command_line.inhibit_common_definition = FALSE;
command_line.interpreter = NULL;
@ -344,6 +345,9 @@ main (int argc, char **argv)
lang_has_input_file = FALSE;
parse_args (argc, argv);
if (config.hash_table_size != 0)
bfd_hash_set_default_size (config.hash_table_size);
ldemul_set_symbols ();
if (link_info.relocatable)

22
ld/lexsup.c
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@ -118,6 +118,7 @@ enum option_values
OPTION_FORCE_EXE_SUFFIX,
OPTION_GC_SECTIONS,
OPTION_NO_GC_SECTIONS,
OPTION_HASH_SIZE,
OPTION_CHECK_SECTIONS,
OPTION_NO_CHECK_SECTIONS,
OPTION_NO_UNDEFINED,
@ -328,6 +329,8 @@ static const struct ld_option ld_options[] =
{ {"no-gc-sections", no_argument, NULL, OPTION_NO_GC_SECTIONS},
'\0', NULL, N_("Don't remove unused sections (default)"),
TWO_DASHES },
{ {"hash-size=<NUMBER>", required_argument, NULL, OPTION_HASH_SIZE},
'\0', NULL, N_("Set default hash table size close to <NUMBER>"), TWO_DASHES },
{ {"help", no_argument, NULL, OPTION_HELP},
'\0', NULL, N_("Print option help"), TWO_DASHES },
{ {"init", required_argument, NULL, OPTION_INIT},
@ -364,6 +367,8 @@ static const struct ld_option ld_options[] =
'\0', N_("TARGET"), N_("Specify target of output file"), EXACTLY_TWO_DASHES },
{ {"qmagic", no_argument, NULL, OPTION_IGNORE},
'\0', NULL, N_("Ignored for Linux compatibility"), ONE_DASH },
{ {"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS},
'\0', NULL, N_("Reduce memory overheads, possibly taking much longer"), TWO_DASHES },
{ {"relax", no_argument, NULL, OPTION_RELAX},
'\0', NULL, N_("Relax branches on certain targets"), TWO_DASHES },
{ {"retain-symbols-file", required_argument, NULL,
@ -447,8 +452,6 @@ static const struct ld_option ld_options[] =
'\0', NULL, N_("Always set DT_NEEDED for following dynamic libs"), TWO_DASHES },
{ {"wrap", required_argument, NULL, OPTION_WRAP},
'\0', N_("SYMBOL"), N_("Use wrapper functions for SYMBOL"), TWO_DASHES },
{ {"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS},
'\0', NULL, N_("reduce memory overheads, possibly taking much longer"), TWO_DASHES },
};
#define OPTION_COUNT ARRAY_SIZE (ld_options)
@ -1224,9 +1227,24 @@ parse_args (unsigned argc, char **argv)
case OPTION_FINI:
link_info.fini_function = optarg;
break;
case OPTION_REDUCE_MEMORY_OVERHEADS:
command_line.reduce_memory_overheads = TRUE;
if (config.hash_table_size == 0)
config.hash_table_size = 1021;
break;
case OPTION_HASH_SIZE:
{
bfd_size_type new_size;
new_size = strtoul (optarg, NULL, 0);
if (new_size)
config.hash_table_size = new_size;
else
einfo (_("%P%X: --hash-size needs a numeric argument\n"));
}
break;
}
}