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* NEWS: Mention new linker map file generation and the

Browse source 
--reduce-memory-overheads option.
	* ld.texinfo: Document --reduce-memory-overheads option.
	* ld.h (map_symbol_def): New struct.
	(struct user_section_struct, section_userdata_type): Rename to:
	(struct lean_user_section_struct, lean_section_userdata_type).
	(struct fat_user_section_struct, fat_section_userdata_type): New.
	(SECTION_USERDATA_SIZE): Define.
	(args_type): New member reduce_memory_overheads.
	* ldlang.c (map_obstack): New static variable.
	(init_map_userdata, print_all_symbols, sort_def_symbol): New functions.
	(lang_map): Unless command_line.reduce_memory_overheads is set,
	initialize lists of defined symbols for each section.
	(print_input_section): Unless command_line.reduce_memory_overheads
	is set, use print_all_symbols.
	(init_os): Use lean_section_userdata_type / SECTION_USERDATA_SIZE.
	* ldmain.c (main): Initialize command_line.reduce_memory_overheads.
	* lexsup.c (enum option_values): Add OPTION_REDUCE_MEMORY_OVERHEADS.
	(ld_options): Add entry for --reduce-memory-overheads.
	(parse_args): Handle OPTION_REDUCE_MEMORY_OVERHEADS.
This commit is contained in:
Joern Rennecke 2004-05-19 14:15:55 +00:00
parent 0841712ea9
commit 35835446e4
7 changed files with 149 additions and 9 deletions
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23
ld/ChangeLog
View file

@ -1,3 +1,26 @@
2004-05-19 J"orn Rennecke <joern.rennecke@superh.com>
* NEWS: Mention new linker map file generation and the
--reduce-memory-overheads option.
* ld.texinfo: Document --reduce-memory-overheads option.
* ld.h (map_symbol_def): New struct.
(struct user_section_struct, section_userdata_type): Rename to:
(struct lean_user_section_struct, lean_section_userdata_type).
(struct fat_user_section_struct, fat_section_userdata_type): New.
(SECTION_USERDATA_SIZE): Define.
(args_type): New member reduce_memory_overheads.
* ldlang.c (map_obstack): New static variable.
(init_map_userdata, print_all_symbols, sort_def_symbol): New functions.
(lang_map): Unless command_line.reduce_memory_overheads is set,
initialize lists of defined symbols for each section.
(print_input_section): Unless command_line.reduce_memory_overheads
is set, use print_all_symbols.
(init_os): Use lean_section_userdata_type / SECTION_USERDATA_SIZE.
* ldmain.c (main): Initialize command_line.reduce_memory_overheads.
* lexsup.c (enum option_values): Add OPTION_REDUCE_MEMORY_OVERHEADS.
(ld_options): Add entry for --reduce-memory-overheads.
(parse_args): Handle OPTION_REDUCE_MEMORY_OVERHEADS.
2004-05-19 Jakub Jelinek <jakub@redhat.com>
* ldgram.y (sect_constraint): New.

6
ld/NEWS
View file

@ -1,5 +1,11 @@
-*- text -*-
* 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.
* New PE --large-address-aware option to indicate executables support virtual
addresses greater than 2 gigabytes.

31
ld/ld.h
View file

@ -78,11 +78,32 @@ struct wildcard_list {
struct wildcard_spec spec;
};
struct map_symbol_def {
struct bfd_link_hash_entry *entry;
struct map_symbol_def *next;
};
/* Extra information we hold on sections */
typedef struct user_section_struct {
/* Pointer to the section where this data will go */
typedef struct lean_user_section_struct {
/* For output sections: pointer to the section where this data will go. */
struct lang_input_statement_struct *file;
} section_userdata_type;
} lean_section_userdata_type;
/* The initial part of fat_user_section_struct has to be idential with
lean_user_section_struct. */
typedef struct fat_user_section_struct {
/* For output sections: pointer to the section where this data will go. */
struct lang_input_statement_struct *file;
/* For input sections, when writing a map file: head / tail of a linked
list of hash table entries for symbols defined in this section. */
struct map_symbol_def *map_symbol_def_head;
struct map_symbol_def **map_symbol_def_tail;
} fat_section_userdata_type;
#define SECTION_USERDATA_SIZE \
(command_line.reduce_memory_overheads \
? sizeof (lean_section_userdata_type) \
: sizeof (fat_section_userdata_type))
#define get_userdata(x) ((x)->userdata)
@ -154,6 +175,10 @@ typedef struct {
input files. */
bfd_boolean accept_unknown_input_arch;
/* If TRUE reduce memory overheads, at the expense of speed.
This will cause map file generation to use an O(N^2) algorithm. */
bfd_boolean reduce_memory_overheads;
} args_type;
extern args_type command_line;

8
ld/ld.texinfo
View file

@ -1734,6 +1734,14 @@ 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 --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.
@end table
@c man end

79
ld/ldlang.c
View file

@ -47,6 +47,7 @@
/* Locals variables. */
static struct obstack stat_obstack;
static struct obstack map_obstack;
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free free
@ -65,6 +66,7 @@ static struct bfd_hash_table lang_definedness_table;
/* Forward declarations. */
static void exp_init_os (etree_type *);
static void init_map_userdata (bfd *, asection *, void *);
static bfd_boolean wildcardp (const char *);
static lang_input_statement_type *lookup_name (const char *);
static bfd_boolean load_symbols (lang_input_statement_type *,
@ -72,6 +74,8 @@ static bfd_boolean load_symbols (lang_input_statement_type *,
static struct bfd_hash_entry *lang_definedness_newfunc
(struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
static void insert_undefined (const char *);
static void print_all_symbols (asection *);
static bfd_boolean sort_def_symbol (struct bfd_link_hash_entry *, void *);
static void print_statement (lang_statement_union_type *,
lang_output_section_statement_type *);
static void print_statement_list (lang_statement_union_type *,
@ -688,6 +692,7 @@ void
lang_map (void)
{
lang_memory_region_type *m;
bfd *p;
minfo (_("\nMemory Configuration\n\n"));
fprintf (config.map_file, "%-16s %-18s %-18s %s\n",
@ -733,15 +738,66 @@ lang_map (void)
fprintf (config.map_file, _("\nLinker script and memory map\n\n"));
if (! command_line.reduce_memory_overheads)
{
obstack_begin (&map_obstack, 1000);
for (p = link_info.input_bfds; p != (bfd *) NULL; p = p->link_next)
bfd_map_over_sections (p, init_map_userdata, 0);
bfd_link_hash_traverse (link_info.hash, sort_def_symbol, 0);
}
print_statements ();
}
static void
init_map_userdata (abfd, sec, data)
bfd *abfd ATTRIBUTE_UNUSED;
asection *sec;
void *data ATTRIBUTE_UNUSED;
{
fat_section_userdata_type *new_data
= ((fat_section_userdata_type *) (stat_alloc
(sizeof (fat_section_userdata_type))));
ASSERT (get_userdata (sec) == NULL);
get_userdata (sec) = new_data;
new_data->map_symbol_def_tail = &new_data->map_symbol_def_head;
}
static bfd_boolean
sort_def_symbol (hash_entry, info)
struct bfd_link_hash_entry *hash_entry;
void *info ATTRIBUTE_UNUSED;
{
if (hash_entry->type == bfd_link_hash_defined
|| hash_entry->type == bfd_link_hash_defweak)
{
struct fat_user_section_struct *ud;
struct map_symbol_def *def;
ud = get_userdata (hash_entry->u.def.section);
if (! ud)
{
/* ??? What do we have to do to initialize this beforehand? */
/* The first time we get here is bfd_abs_section... */
init_map_userdata (0, hash_entry->u.def.section, 0);
ud = get_userdata (hash_entry->u.def.section);
}
else if (!ud->map_symbol_def_tail)
ud->map_symbol_def_tail = &ud->map_symbol_def_head;
def = (struct map_symbol_def *) obstack_alloc (&map_obstack, sizeof *def);
def->entry = hash_entry;
*ud->map_symbol_def_tail = def;
ud->map_symbol_def_tail = &def->next;
}
return TRUE;
}
/* Initialize an output section. */
static void
init_os (lang_output_section_statement_type *s)
{
section_userdata_type *new;
lean_section_userdata_type *new;
if (s->bfd_section != NULL)
return;
@ -749,7 +805,7 @@ init_os (lang_output_section_statement_type *s)
if (strcmp (s->name, DISCARD_SECTION_NAME) == 0)
einfo (_("%P%F: Illegal use of `%s' section\n"), DISCARD_SECTION_NAME);
new = stat_alloc (sizeof (section_userdata_type));
new = stat_alloc (SECTION_USERDATA_SIZE);
s->bfd_section = bfd_get_section_by_name (output_bfd, s->name);
if (s->bfd_section == NULL)
@ -2367,7 +2423,7 @@ print_input_statement (lang_input_statement_type *statm)
}
/* Print all symbols defined in a particular section. This is called
via bfd_link_hash_traverse. */
via bfd_link_hash_traverse, or by print_all_symbols. */
static bfd_boolean
print_one_symbol (struct bfd_link_hash_entry *hash_entry, void *ptr)
@ -2393,6 +2449,18 @@ print_one_symbol (struct bfd_link_hash_entry *hash_entry, void *ptr)
return TRUE;
}
static void
print_all_symbols (sec)
asection *sec;
{
struct fat_user_section_struct *ud = get_userdata (sec);
struct map_symbol_def *def;
*ud->map_symbol_def_tail = 0;
for (def = ud->map_symbol_def_head; def; def = def->next)
print_one_symbol (def->entry, sec);
}
/* Print information about an input section to the map file. */
static void
@ -2445,7 +2513,10 @@ print_input_section (lang_input_section_type *in)
minfo (_("%W (size before relaxing)\n"), i->_raw_size);
}
bfd_link_hash_traverse (link_info.hash, print_one_symbol, i);
if (command_line.reduce_memory_overheads)
bfd_link_hash_traverse (link_info.hash, print_one_symbol, i);
else
print_all_symbols (i);
print_dot = (i->output_section->vma + i->output_offset
+ TO_ADDR (size));

1
ld/ldmain.c
View file

@ -274,6 +274,7 @@ main (int argc, char **argv)
command_line.warn_mismatch = TRUE;
command_line.check_section_addresses = TRUE;
command_line.accept_unknown_input_arch = FALSE;
command_line.reduce_memory_overheads = FALSE;
/* We initialize DEMANGLING based on the environment variable
COLLECT_NO_DEMANGLE. The gcc collect2 program will demangle the

10
ld/lexsup.c
View file

@ -142,7 +142,8 @@ enum option_values
OPTION_PIE,
OPTION_UNRESOLVED_SYMBOLS,
OPTION_WARN_UNRESOLVED_SYMBOLS,
OPTION_ERROR_UNRESOLVED_SYMBOLS
OPTION_ERROR_UNRESOLVED_SYMBOLS,
OPTION_REDUCE_MEMORY_OVERHEADS
};
/* The long options. This structure is used for both the option
@ -445,7 +446,9 @@ static const struct ld_option ld_options[] =
{ {"no-as-needed", no_argument, NULL, OPTION_NO_AS_NEEDED},
'\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 }
'\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)
@ -1221,6 +1224,9 @@ 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;
break;
}
}