[PATCH][GOLD] Adjust section offset in an output section during relaxation.

[=?big5?b?RG91ZyBLd2FuICjD9q62vHcp?= <dougkwan at google dot com>]

Hi,

    This mainly fixes a problem in which section offsets of input
sections in an output section are not updated during relaxation.  If
one of the input sections is relaxed, all the input sections after
that need to have their section offsets updated.  I took a simpler
approach of updating all the section offsets.  This patch also
contains a few unrelated changes that are used by the EXIDX code.  I
renamed Output_section::add_input_section_for_script() to
Output_section::add_simple_input_section() since it is also used by
the EXIDX fix-up and the method is not really for scripts only.  I
also added Output_section::discard_states() method to discard the
currently saved states.  The EXIDX fix-up needs to modify many saved
states.  So it is easier to just discard the saved states and re-take
another snapshot after the fix-up.

-Doug

2010-01-22  Doug Kwan  <dougkwan@google.com>

        * arm.cc (Target_arm::do_relax): Record an output section for section
        offset adjustment it contains any stub table that has changed.
        * layout.cc (Layout::clean_up_after_relaxation): Adjust section
        offsets in an output section if necessary.
        * output.cc (Output_section::Output_section): Initialize
        section_offsets_need_adjustments_.
        (Output_section::add_input_section_for_script): Renamed to
        Output_section::add_simple_input_section.
        (Output_section::save_states): Add a comment.
        (Output_section::discard_states): New method defintion.
        (Output_section::adjust_section_offsets): Same.
        * output.h (Output_section::add_input_section_for_script): Renamed to
        Output_section::add_simple_input_section.
        (Output_section::discard_states): New method declaration.
        (Output_section::adjust_section_offsets): Same.
        (Output_section::section_offsets_need_adjustment,
        Output_section::set_section_offsets_need_adjustment): New method
        definitions.
        (Output_section::section_offsets_need_adjustment_): New data member.
        * script-sections.cc
        (Output_section_element_input::set_section_address): Adjust code for
        renaming of Output_section::add_input_section_for_script.
        (Orphan_output_section::set_section_address): Same.

Attachment: patch-output.txt
Description: Text document