Identical Code Folding committed to gold.

[Cary Coutant]

For the record, this patch was approved offline by Ian.

-cary


On Wed, Aug 5, 2009 at 2:03 PM, Sriraman Tallam<tmsriram@google.com> wrote:
> Hi,
>
>      I committed the Identical Code Folding (ICF) patch to gold.
>
> Thanks,
> -Sriraman.
>
>
> 2009-08-05  Sriraman Tallam  <tmsriram@google.com>
>
>    * icf.cc: New file.
>    * icf.h: New file.
>    * Makefile.am (CCFILES): Add icf.cc.
>    (HFILES): Add icf.h
>    * Makefile.in: Regenerate.
>    * dynobj.h (Sized_dynobj::do_section_entsize): New function.
>    * gc.h (gc_process_relocs): Populate lists used by icf to contain
>    section, symbol and addend information for the relocs.
>    * gold.cc (queue_middle_tasks): Call identical code folding.
>    * gold.h: Add defines for multimap.
>    * layout.cc (Layout::create_symtab_sections): Add symtab as parameter
>    to the call of finalize_local_symbols.
>    * main.cc (main): Create object of class Icf.
>    * object.cc (Sized_relobj::do_layout): Allow this function to be
>    called twice during icf.
>    (Sized_relobj::do_finalize_local_symbols): Fold symbols corresponding
>    to sections marked as identical by icf.
>    (Sized_relobj::do_section_flags): Get section_flags from Symbols_data
>    when available.
>    (Sized_relobj::do_section_entsize): New function.
>    * object.h (Object::section_entsize): New function.
>    (Object::do_section_entsize): New pure virtual function.
>    (Relobj::finalize_local_symbols): Add new parameter.
>    (Relobj::do_section_entsize): New function.
>    * options.h (General_options::icf): New option.
>    (General_options::icf_iterations): New option.
>    (General_options::print_icf_sections): New option.
>    * plugin.cc (Sized_pluginobj::do_section_entsize): New function.
>    * plugin.h (Sized_pluginobj::do_section_entsize): New function.
>    * reloc.cc (Read_relocs::run): Delay scanning relocs when doing
>    icf.
>    * symtab.cc (Symbol_table::is_section_folded): New function.
>    (Symbol_table::sized_finalize_symbol):  Fold symbols corresponding
>    to sections marked as identical by icf.
>    * symtab.h (Symbol_table::set_icf): New function.
>    (Symbol_table::icf): New function.
>    (Symbol_table::is_section_folded): New function.
>    (Symbol_table::icf_): New data member.
>    * target-reloc.h (relocate_section): Ignore sections folded by icf.
>    * testsuite/Makefile.am: Add commands to build icf_test.
>    * testsuite/Makefile.in: Regenerate.
>    * testsuite/icf_test.sh: New file.
>    * testsuite/icf_test.cc: New file.
>