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Don't create unnecessary output sections. 

* ldlang.c (out_bfd_get_section_by_name): Remove.
	(wild_section): Call bfd_get_section_by_name rather than
	our_bfd_get_section_by_name.  Don't call wild_doit if there is no
	section.
	(lang_create_output_section_statements): Remove.
	(map_input_to_output_sections): For several cases, call init_os if
	it has not already been called.
	(lang_size_sections): If output section was not created, skip it.
	(lang_process): Don't call lan_create_output_section_statements.
	(lang_place_orphans): Skip files with just_syms_flags set to true.
	* ld.texinfo: Document change.
This commit is contained in:
Ian Lance Taylor 1994-05-11 20:29:21 +00:00
parent 4fa4476bf8
commit f9d3d71ae8
3 changed files with 72 additions and 57 deletions
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15
ld/ChangeLog
View File

@ -1,3 +1,18 @@
Wed May 11 16:24:19 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
Don't create unnecessary output sections.
* ldlang.c (out_bfd_get_section_by_name): Remove.
(wild_section): Call bfd_get_section_by_name rather than
our_bfd_get_section_by_name. Don't call wild_doit if there is no
section.
(lang_create_output_section_statements): Remove.
(map_input_to_output_sections): For several cases, call init_os if
it has not already been called.
(lang_size_sections): If output section was not created, skip it.
(lang_process): Don't call lan_create_output_section_statements.
(lang_place_orphans): Skip files with just_syms_flags set to true.
* ld.texinfo: Document change.
Tue May 10 14:31:16 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
* ldlang.c (wild_doit): Don't bother initializing the vma and

45
ld/ld.texinfo
View File

@ -9,7 +9,7 @@
@ifinfo
@format
START-INFO-DIR-ENTRY
* Ld:: The GNU linker.
* Ld: (ld). The GNU linker.
END-INFO-DIR-ENTRY
@end format
@end ifinfo
@ -98,6 +98,9 @@ This file documents the GNU linker ld.
@ifset H8300
* H8/300:: ld and the H8/300
@end ifset
@ifset Hitachi
* Hitachi:: ld and other Hitachi micros
@end ifset
@ifset I960
* i960:: ld and the Intel 960 family
@end ifset
@ -1432,6 +1435,15 @@ sequence of characters, but any name which does not conform to the standard
@code{ld} symbol name syntax must be quoted.
@xref{Symbols, , Symbol Names}.
The linker will not create output sections which do not have any
contents. This is for convenience when referring to input sections that
may or may not exist. For example,
@example
.foo @{ *(.foo @}
@end example
will only create a @samp{.foo} section in the output file if there is a
@samp{.foo} section in at least one input file.
@node Section Placement
@subsection Section Placement
@ -1713,7 +1725,7 @@ optional portions:
SECTIONS @{
@dots{}
@var{secname} @var{start} BLOCK(@var{align}) (NOLOAD) : AT ( @var{ldadr} )
@{ @var{contents} @} =@var{fill} >@var{region}
@{ @var{contents} @} >@var{region} =@var{fill}
@dots{}
@}
@end smallexample
@ -1722,7 +1734,7 @@ SECTIONS @{
Definition}, and @pxref{Section Placement} for details on
@var{contents}. The remaining elements---@var{start},
@code{BLOCK(@var{align)}}, @code{(NOLOAD)}, @code{AT ( @var{ldadr} )},
@code{=@var{fill}}, and @code{>@var{region}}---are all optional.
@code{>@var{region}}, and @code{=@var{fill}}---are all optional.
@table @code
@cindex start address, section
@ -1816,6 +1828,13 @@ for (dst = _bstart; dst< _bend; dst++)
*dst = 0;
@end smallexample
@kindex >@var{region}
@cindex section, assigning to memory region
@cindex memory regions and sections
@item >@var{region}
Assign this section to a previously defined region of memory.
@xref{MEMORY}.
@kindex =@var{fill}
@cindex section fill pattern
@cindex fill pattern, entire section
@ -1828,13 +1847,6 @@ significant bytes of the value, repeated as necessary. You can also
change the fill value with a @code{FILL} statement in the @var{contents}
of a section definition.
@kindex >@var{region}
@cindex section, assigning to memory region
@cindex memory regions and sections
@item >@var{region}
Assign this section to a previously defined region of memory.
@xref{MEMORY}.
@end table
@node Entry Point
@ -2072,6 +2084,19 @@ top page of memory).
@end ifclear
@end ifset
@ifclear GENERIC
@ifset Hitachi
@c This stuff is pointless to say unless you're especially concerned
@c with Hitachi chips; don't enable it for generic case, please.
@node Hitachi
@chapter @code{ld} and other Hitachi chips
@code{ld} also supports the H8/300H, the H8/500, and the Hitachi SH. No
special features, commands, or command-line options are required for
these chips.
@end ifset
@end ifclear
@ifset I960
@ifclear GENERIC
@raisesections

69
ld/ldlang.c
View File

@ -81,8 +81,6 @@ static void wild_doit PARAMS ((lang_statement_list_type *ptr,
asection *section,
lang_output_section_statement_type *output,
lang_input_statement_type *file));
static asection *our_bfd_get_section_by_name PARAMS ((bfd *abfd,
const char *section));
static void wild_section PARAMS ((lang_wild_statement_type *ptr,
const char *section,
lang_input_statement_type *file,
@ -98,7 +96,6 @@ static void ldlang_open_output PARAMS ((lang_statement_union_type *statement));
static void open_input_bfds PARAMS ((lang_statement_union_type *statement));
static void lang_reasonable_defaults PARAMS ((void));
static void lang_place_undefineds PARAMS ((void));
static void lang_create_output_section_statements PARAMS ((void));
static void map_input_to_output_sections
PARAMS ((lang_statement_union_type *s,
const char *target,
@ -701,14 +698,6 @@ wild_doit (ptr, section, output, file)
}
}
static asection *
our_bfd_get_section_by_name (abfd, section)
bfd * abfd;
CONST char *section;
{
return bfd_get_section_by_name (abfd, section);
}
static void
wild_section (ptr, section, file, output)
lang_wild_statement_type * ptr;
@ -723,21 +712,21 @@ wild_section (ptr, section, file, output)
if (section == (char *) NULL)
{
/* Do the creation to all sections in the file */
for (s = file->the_bfd->sections; s != (asection *) NULL; s = s->next)
{
/* except for bss */
if ((s->flags & SEC_IS_COMMON) == 0)
for (s = file->the_bfd->sections; s != NULL; s = s->next)
{
wild_doit (&ptr->children, s, output, file);
/* except for bss */
if ((s->flags & SEC_IS_COMMON) == 0)
{
wild_doit (&ptr->children, s, output, file);
}
}
}
}
else
{
/* Do the creation to the named section only */
wild_doit (&ptr->children,
our_bfd_get_section_by_name (file->the_bfd, section),
output, file);
s = bfd_get_section_by_name (file->the_bfd, section);
if (s != NULL)
wild_doit (&ptr->children, s, output, file);
}
}
}
@ -1038,27 +1027,6 @@ lang_place_undefineds ()
}
}
/* Copy important data from out internal form to the bfd way. Also
create a section for the dummy file
*/
static void
lang_create_output_section_statements ()
{
lang_statement_union_type *os;
for (os = lang_output_section_statement.head;
os != (lang_statement_union_type *) NULL;
os = os->output_section_statement.next)
{
lang_output_section_statement_type *s =
&os->output_section_statement;
init_os (s);
}
}
/* Open input files and attatch to output sections */
static void
map_input_to_output_sections (s, target, output_section_statement)
@ -1100,6 +1068,10 @@ map_input_to_output_sections (s, target, output_section_statement)
case lang_reloc_statement_enum:
case lang_assignment_statement_enum:
case lang_padding_statement_enum:
case lang_input_statement_enum:
if (output_section_statement != NULL
&& output_section_statement->bfd_section == NULL)
init_os (output_section_statement);
break;
case lang_afile_asection_pair_statement_enum:
FAIL ();
@ -1119,9 +1091,6 @@ map_input_to_output_sections (s, target, output_section_statement)
}
}
break;
case lang_input_statement_enum:
/* A standard input statement, has no wildcards */
break;
}
}
}
@ -1639,6 +1608,12 @@ lang_size_sections (s, output_section_statement, prev, fill, dot, relax)
bfd_vma after;
lang_output_section_statement_type *os = &s->output_section_statement;
if (os->bfd_section == NULL)
{
/* This section was never actually created. */
break;
}
/* If this is a COFF shared library section, use the size and
address from the input section. FIXME: This is COFF
specific; it would be cleaner if there were some other way
@ -2256,6 +2231,9 @@ lang_place_orphans ()
{
asection *s;
if (file->just_syms_flag)
continue;
for (s = file->the_bfd->sections;
s != (asection *) NULL;
s = s->next)
@ -2516,9 +2494,6 @@ lang_process ()
current_target = default_target;
lang_for_each_statement (ldlang_open_output); /* Open the output file */
/* For each output section statement, create a section in the output
file */
lang_create_output_section_statements ();
ldemul_create_output_section_statements ();