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:
parent
4fa4476bf8
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15
ld/ChangeLog
15
ld/ChangeLog
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@ -1,3 +1,18 @@
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Wed May 11 16:24:19 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
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Don't create unnecessary output sections.
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* ldlang.c (out_bfd_get_section_by_name): Remove.
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(wild_section): Call bfd_get_section_by_name rather than
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our_bfd_get_section_by_name. Don't call wild_doit if there is no
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section.
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(lang_create_output_section_statements): Remove.
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(map_input_to_output_sections): For several cases, call init_os if
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it has not already been called.
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(lang_size_sections): If output section was not created, skip it.
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(lang_process): Don't call lan_create_output_section_statements.
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(lang_place_orphans): Skip files with just_syms_flags set to true.
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* ld.texinfo: Document change.
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Tue May 10 14:31:16 1994 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
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* ldlang.c (wild_doit): Don't bother initializing the vma and
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@ -9,7 +9,7 @@
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@ifinfo
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@format
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START-INFO-DIR-ENTRY
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* Ld:: The GNU linker.
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* Ld: (ld). The GNU linker.
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END-INFO-DIR-ENTRY
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@end format
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@end ifinfo
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@ -98,6 +98,9 @@ This file documents the GNU linker ld.
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@ifset H8300
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* H8/300:: ld and the H8/300
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@end ifset
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@ifset Hitachi
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* Hitachi:: ld and other Hitachi micros
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@end ifset
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@ifset I960
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* i960:: ld and the Intel 960 family
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@end ifset
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@ -1432,6 +1435,15 @@ sequence of characters, but any name which does not conform to the standard
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@code{ld} symbol name syntax must be quoted.
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@xref{Symbols, , Symbol Names}.
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The linker will not create output sections which do not have any
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contents. This is for convenience when referring to input sections that
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may or may not exist. For example,
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@example
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.foo @{ *(.foo @}
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@end example
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will only create a @samp{.foo} section in the output file if there is a
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@samp{.foo} section in at least one input file.
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@node Section Placement
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@subsection Section Placement
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@ -1713,7 +1725,7 @@ optional portions:
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SECTIONS @{
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@dots{}
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@var{secname} @var{start} BLOCK(@var{align}) (NOLOAD) : AT ( @var{ldadr} )
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@{ @var{contents} @} =@var{fill} >@var{region}
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@{ @var{contents} @} >@var{region} =@var{fill}
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@dots{}
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@}
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@end smallexample
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@ -1722,7 +1734,7 @@ SECTIONS @{
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Definition}, and @pxref{Section Placement} for details on
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@var{contents}. The remaining elements---@var{start},
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@code{BLOCK(@var{align)}}, @code{(NOLOAD)}, @code{AT ( @var{ldadr} )},
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@code{=@var{fill}}, and @code{>@var{region}}---are all optional.
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@code{>@var{region}}, and @code{=@var{fill}}---are all optional.
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@table @code
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@cindex start address, section
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@ -1816,6 +1828,13 @@ for (dst = _bstart; dst< _bend; dst++)
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*dst = 0;
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@end smallexample
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@kindex >@var{region}
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@cindex section, assigning to memory region
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@cindex memory regions and sections
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@item >@var{region}
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Assign this section to a previously defined region of memory.
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@xref{MEMORY}.
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@kindex =@var{fill}
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@cindex section fill pattern
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@cindex fill pattern, entire section
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@ -1828,13 +1847,6 @@ significant bytes of the value, repeated as necessary. You can also
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change the fill value with a @code{FILL} statement in the @var{contents}
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of a section definition.
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@kindex >@var{region}
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@cindex section, assigning to memory region
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@cindex memory regions and sections
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@item >@var{region}
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Assign this section to a previously defined region of memory.
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@xref{MEMORY}.
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@end table
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@node Entry Point
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@ -2072,6 +2084,19 @@ top page of memory).
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@end ifclear
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@end ifset
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@ifclear GENERIC
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@ifset Hitachi
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@c This stuff is pointless to say unless you're especially concerned
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@c with Hitachi chips; don't enable it for generic case, please.
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@node Hitachi
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@chapter @code{ld} and other Hitachi chips
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@code{ld} also supports the H8/300H, the H8/500, and the Hitachi SH. No
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special features, commands, or command-line options are required for
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these chips.
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@end ifset
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@end ifclear
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@ifset I960
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@ifclear GENERIC
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@raisesections
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69
ld/ldlang.c
69
ld/ldlang.c
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@ -81,8 +81,6 @@ static void wild_doit PARAMS ((lang_statement_list_type *ptr,
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asection *section,
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lang_output_section_statement_type *output,
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lang_input_statement_type *file));
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static asection *our_bfd_get_section_by_name PARAMS ((bfd *abfd,
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const char *section));
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static void wild_section PARAMS ((lang_wild_statement_type *ptr,
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const char *section,
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lang_input_statement_type *file,
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@ -98,7 +96,6 @@ static void ldlang_open_output PARAMS ((lang_statement_union_type *statement));
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static void open_input_bfds PARAMS ((lang_statement_union_type *statement));
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static void lang_reasonable_defaults PARAMS ((void));
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static void lang_place_undefineds PARAMS ((void));
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static void lang_create_output_section_statements PARAMS ((void));
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static void map_input_to_output_sections
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PARAMS ((lang_statement_union_type *s,
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const char *target,
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@ -701,14 +698,6 @@ wild_doit (ptr, section, output, file)
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}
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}
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static asection *
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our_bfd_get_section_by_name (abfd, section)
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bfd * abfd;
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CONST char *section;
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{
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return bfd_get_section_by_name (abfd, section);
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}
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static void
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wild_section (ptr, section, file, output)
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lang_wild_statement_type * ptr;
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@ -723,21 +712,21 @@ wild_section (ptr, section, file, output)
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if (section == (char *) NULL)
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{
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/* Do the creation to all sections in the file */
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for (s = file->the_bfd->sections; s != (asection *) NULL; s = s->next)
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{
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/* except for bss */
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if ((s->flags & SEC_IS_COMMON) == 0)
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for (s = file->the_bfd->sections; s != NULL; s = s->next)
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{
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wild_doit (&ptr->children, s, output, file);
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/* except for bss */
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if ((s->flags & SEC_IS_COMMON) == 0)
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{
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wild_doit (&ptr->children, s, output, file);
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}
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}
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}
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}
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else
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{
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/* Do the creation to the named section only */
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wild_doit (&ptr->children,
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our_bfd_get_section_by_name (file->the_bfd, section),
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output, file);
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s = bfd_get_section_by_name (file->the_bfd, section);
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if (s != NULL)
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wild_doit (&ptr->children, s, output, file);
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}
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}
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}
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}
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}
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/* Copy important data from out internal form to the bfd way. Also
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create a section for the dummy file
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*/
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static void
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lang_create_output_section_statements ()
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{
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lang_statement_union_type *os;
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for (os = lang_output_section_statement.head;
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os != (lang_statement_union_type *) NULL;
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os = os->output_section_statement.next)
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{
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lang_output_section_statement_type *s =
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&os->output_section_statement;
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init_os (s);
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}
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}
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/* Open input files and attatch to output sections */
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static void
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map_input_to_output_sections (s, target, output_section_statement)
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case lang_reloc_statement_enum:
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case lang_assignment_statement_enum:
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case lang_padding_statement_enum:
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case lang_input_statement_enum:
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if (output_section_statement != NULL
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&& output_section_statement->bfd_section == NULL)
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init_os (output_section_statement);
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break;
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case lang_afile_asection_pair_statement_enum:
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FAIL ();
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}
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}
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break;
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case lang_input_statement_enum:
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/* A standard input statement, has no wildcards */
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break;
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}
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}
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}
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bfd_vma after;
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lang_output_section_statement_type *os = &s->output_section_statement;
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if (os->bfd_section == NULL)
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{
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/* This section was never actually created. */
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break;
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}
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/* If this is a COFF shared library section, use the size and
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address from the input section. FIXME: This is COFF
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specific; it would be cleaner if there were some other way
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{
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asection *s;
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if (file->just_syms_flag)
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continue;
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for (s = file->the_bfd->sections;
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s != (asection *) NULL;
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s = s->next)
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current_target = default_target;
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lang_for_each_statement (ldlang_open_output); /* Open the output file */
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/* For each output section statement, create a section in the output
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file */
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lang_create_output_section_statements ();
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ldemul_create_output_section_statements ();
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