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Hi This patch adds support for doing relaxation in Gold. The basic idea is to run part of Layout::finalize until a target hook tell it to stop. To be able to do that, we save some of the states of output sections and output segments and rollback the output sections and output segment states before the relaxation look is restarted. Some of derived classes of Output_data are changed so that they either keep their data size constant or can compute their data size repeatedly. Some output section data may indeed changes. For example, it is possible, though not likely that different number of PT_LOAD segments are created by a script during different iteration of the relaxation loop so now the Output_segment_headers can adjust its size accordingly. I also added a class Output_relaxed_input_section, which will be sub-classed by a target to implement target-specific relaxation. Since this is quite a big change, I also added some debug code. This has been tested on the x86_64 target by running all the tests with a dummy relaxation pass and checks enabled. All tests passed. -Doug 2009-09-04 Doug Kwan <dougkwan@google.com> * gold.cc (demangle.h): New include. (demangled_typename): New function. * gold.h (typeinfo): New include. (RELXAXATION_DEBUG): Add comment. (demangled_typename): New declaration. * layout.cc (Relaxation_debug_check): New class. (Relaxation_debug_check::check_output_data_for_reset_values, Relaxation_debug_check::read_sections, Relaxation_debug_check::read_sections): New method definitions. (Layout::Layout): Initialize data members record_output_section_data_from_scrips_ and script_output_section_data_list_. (Layout::save_segments, Layout::restore_segments, Layout::clean_up_after_relaxation): New method definitions. (Layout::finalize): Support relaxation. (Layout::set_asection_address_from_script): Move code for orphan section placement out. (Layout::place_orphan_sections_in_script, Layout::print_segments, Layout::print_sections, Layout::print_special_outputs): New method definitions. * layout.h (Layout::print_segments, Layout::print_sections, Layout::print_special_outputs): Declare new methods. (Layout::new_output_section_data_from_script): New method definition. (Layout::place_orphan_sections_in_script): New method declaration. (Layout::Segment_states): New type declaration. (Layout::save_segments, Layout::restore_segments, Layout::clean_up_after_relaxation): New method declarations. (Layout::Output_section_data_list): New type declaration. (Layout::record_output_section_data_from_script_, Layout::script_output_section_data_list_): New data member. * options.h (--relax-debug): New option. * output.cc (Output_data::do_debug): New method definition. (Output_section_headers::do_size): New method definition. (Output_section_headers::Output_section_headers): Move size computation to Output_section_headers::do_size. (Output_segment_headers::do_size): New method definition. (Output_file_header::Output_file_header): Move size computation to Output_file_header::do_size and call it. (Output_file_header::do_size): New method definition. (Output_data_group::Output_data_group): Adjust call to Output_section_data. (Output_data_dynamic::set_final_data_size): Add DT_NULL tag only once. (Output_symtab_xindex::do_write): Add array bound check. (Output_section::Input_section::print_to_mapfile): Handle RELAXED_INPUT_SECTION_CODE. (Output_section::Input_section::debug): New method definition. (Output_section::Output_section): Initialize data member checkpoint_. (Output_section::~Output_section): Delete checkpoint object pointed by checkpoint_. (Output_section::add_input_section): Always add an Input_section if relaxing. (Output_section::add_merge_input_section): Add assert. (Output_section::relax_input_section): New method definition. (Output_section::set_final_data_size): Set load address to zero for an unallocated section. (Output_section::do_address_and_file_offset_have_reset_values): New method definition. (Output_section::Input_section_sort_enty::Input_section_sort_enty): Handle relaxed input section. (Output_section::sort_attached_input_sections): Checkpoint input section list lazily. (Output_section::get_input_sections): Change type of input_sections to list of Simple_input_section pointers. Checkpoint input section list lazily. Also handle relaxed input sections. (Output_section::add_input_section_for_script): Take a reference to a Simple_input_section object instead of Relobj pointer and section index as parameter. Handle relaxed input sections. (Output_section::save_states, Output_section::restore_states): New method definitions. (Output_section::do_debug): New method definition. (Output_section::debug): New method definition. * output.h (Output_data::Output_data): Initialize is_data_size_fixed_. (Output_data::is_data_size_fixed): New method definition. (Output_data::reset_addresss_and_file_offset): Do not reset data size if it is fixed. (Output_data::address_and_file_offset_have_reset_values): New method definition. (Output_data::debug): New method definitions. (Output_data::do_address_and_file_offset_have_reset_values): New method definition. (Output_data::do_debug): New method definitions. (Output_data::set_data_size): Check that data size is not fixed. (Output_data::fix_data_size): New method definition. (Output_data::is_data_size_fixed_): New data member. (Output_section_headers::set_final_data_size): New method definition. (Output_section_headers::do_size): New method declaration. (Output_segment_headers::set_final_data_size): New method definition. (Output_segment_headers::do_size): New method declaration. (Output_file_header::set_final_data_size)::New method definition. (Output_file_header::do_size)::New method declaration. (Output_section_data::Output_section_data): Add new parameter is_data_size_fixed and use it to fix data size. (Output_data_const::Output_data_const): Adjust call to base class constructor and fix data size. (Output_data_const_buffer::Output_data_const_buffer): Adjust call to base class constructor and fix data size. (Output_data_fixed_space::Output_data_fixed_space): Adjust call to base class constructor and fix data size. (Output_data_zero_fill::Output_data_zero_fill): Adjust call to base class constructor and fix data size. (Output_data_group::set_final_data_size): New method definition. (Output_data_dynamic::Dynamic_entry::tag): New method definition. (Output_symtab_xindex::Output_symtab_xindex): Adjust call to base class constructor and fix data size. (Output_relaxed_input_section): New class definition. (Output_section::Simple_input_section): New class definition. (Output_section::get_input_sections): Adjust parameter list. (Output_section::add_input_section_for_script): Same. (Output_section::save_states, Output_section::restore_states, Output_section::do_address_and_file_offset_have_reset_values, Output_section::do_debug): New method declarations. (Output_section::Input_section::Input_section): Handle RELAXED_INPUT_SECTION_CODE. Add new overload for Output_relaxed_input_section. (Output_section::Input_section::is_input_section): Handle relaxed input section. (Output_section::Input_section::is_relaxed_input_section, Output_section::Input_section::output_section_data, Output_section::Input_section::relaxed_input_section): New method definitions. (Output_section::Input_section::debug): New method declaration and definition. (Output_section::Input_section::RELAXED_INPUT_SECTION_CODE): New enum value. (Output_section::Input_section::u1_, Output_section::Input_section::u2_ ): Update comments. (Output_section::Checkpoint): New classs definition. (Output_section::relax_input_section): New method declaration. (Output_section::checkpoint_): New data member. (Output_segment): Update comments. (Output_segment::Output_segment): Un-privatize copy constructor. (Output_segment::operator=): Un-privatize. (Output_segment::debug): New method declaration and definition. * script-sections.cc (Output_section_element::Input_section_list): Change element type to Output_section::Simple_input_section. (Output_section_element_dot_assignment::set_section_addresses): Register output section data for relaxation clean up. (Output_data_exression::Output_data_expression): Adjust call to base constructor to fix data size. (Output_section_element_data::set_section_addresses): Register Output_data_expression object for relaxation clean up. (struct Input_section_info): Replace Relobj pointer and section index pair with Output_section::Simple_input_section and Convert struct to a class. (Input_section_sorter::operator()): Adjust access to Input_section_info data member to use accessors. (Output_section_element_input::set_section_addresses): Use layout parameter. Adjust code to use Output_section::Simple_input_section and Input_secction_info classes. Register filler for relaxation clean up. (Orphan_output_section::set_section_addresses): Replace Relobj pointer and section index pair with Output_section::Simple_input_section class. Adjust code accordingly. (Phdrs_element::release_segment): New method definition. (Script_sections::attach_sections_using_phdrs_clause): Do not modify segment list. (Script_sections::release_segments): New method definition. * gold/script-sections.h (Script_sections::release_segments): New method declaration. * gold/target.h (Target::may_relax, Target::relax, Target::do_may_relax, Target::do_relax): New method definitions.
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