Identical Code Folding committed to gold.

[Sriraman Tallam <tmsriram at google dot com>]

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.

Attachment: icf_patch
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