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2009-10-28 * plugin.h (Plugin::Plugin): Initialize cleanup_done_.Cary Coutant1-7/+10
(Plugin::cleanup_done_): New member. (Plugin_manager::Plugin_manager): Remove cleanup_done_. (Plugin_manager::cleanup_done_): Remove. (Plugin_manager::add_input_file): Edit error message. * plugin.cc (Plugin::cleanup): Test and set cleanup_done_. (Plugin_manager::cleanup): Remove use of cleanup_done_.
2009-10-12 * plugin.cc: Include "gold.h" before other header files.Ian Lance Taylor1-1/+2
2009-10-102009-10-10 Chris Demetriou <cgd@google.com>Chris Demetriou1-1/+5
* options.h (Input_file_argument::Input_file_type): New enum. (Input_file_argument::is_lib_): Replace with... (Input_file_argument::type_): New member. (Input_file_argument::Input_file_argument): Take Input_file_type 'type' rather than boolean 'is_lib' as second argument. (Input_file_argument::is_lib): Use type_. (Input_file_argument::is_searched_file): New function. (Input_file_argument::may_need_search): Handle is_searched_file. * options.cc (General_options::parse_library): Support -l:filename. (General_options::parse_just_symbols): Update for Input_file_argument changes. (Command_line::process): Likewise. * archive.cc (Archive::get_file_and_offset): Likewise. * plugin.cc (Plugin_manager::release_input_file): Likewise. * script.cc (read_script_file, script_add_file): Likewise. * fileread.cc (Input_file::Input_file): Likewise. (Input_file::will_search_for): Handle is_searched_file. (Input_file::open): Likewise. * readsyms.cc (Read_symbols::get_name): Likewise. * testsuite/Makefile.am (searched_file_test): New test. * testsuite/Makefile.in: Regenerate. * testsuite/searched_file_test.cc: New file. * testsuite/searched_file_test_lib.cc: New file.
2009-10-09 * plugin.cc: Don't include dlfcn.h when ENABLE_PLUGINS is notIan Lance Taylor1-0/+3
defined.
2009-10-06 * plugin.cc (add_input_library): New.Ian Lance Taylor1-4/+20
(Plugin::load): Add add_input_library to tv. (Plugin_manager::add_input_file): Add the is_lib argument. (add_input_file): Update call to Plugin_manager::add_input_file. (add_input_library): New. * plugin.h (Plugin_manager::add_input_file): Add the is_lib argument.
2009-09-30 * object.h (class Object): Remove target_ field, and target,Ian Lance Taylor1-10/+6
sized_target, and set_target methods. (Object::sized_target): Remove. (class Sized_relobj): Update declarations. Remove sized_target. * object.cc (Sized_relobj::setup): Remove target parameter. Change all callers. (Input_objects::add_object): Don't do anything with the target. (make_elf_sized_object): Add punconfigured parameter. Change all callers. Set or test parameter target. * dynobj.cc (Sized_dynobj::target): Remove target parameter. Change all callers. * parameters.cc (Parameters::set_target): Change parameter type to be non-const. (Parameters::default_target): Remove. (set_parameters_target): Change parameter type to be non-const. (parameters_force_valid_target): New function. (parameters_clear_target): New function. * parameters.h (class Parameters): Update declarations. Remove default_target method. Add sized_target and clear_target methods. Change target_ to be non-const. (set_parameters_target): Update declaration. (parameters_force_valid_target): Declare. (parameters_clear_target): Declare. * readsyms.cc (Read_symbols::do_read_symbols): Pass punconfigured as NULL if we aren't searching. (Add_symbols::run): Don't check for compatible target. * fileread.cc (Input_file::open_binary): Call parameters_force_valid_target. * gold.cc (queue_middle_tasks): Likewise. * plugin.cc (make_sized_plugin_object): Likewise. Don't call set_target on object. * dynobj.h (class Sized_dynobj): Update declarations. * archive.cc (Archive::get_elf_object_for_member): Return NULL if make_elf_object returns NULL. (Archive::include_member): Don't check whether object target is compatible. * output.cc (Output_section::add_input_section): Get target from parameters. (Output_section::relax_input_section): Likewise. * reloc.cc (Sized_relobj::do_gc_process_relocs): Get target from parameters. (Sized_relobj::do_scan_relocs): Likewise. (Sized_relobj::relocate_sections): Likewise. * resolve.cc (Symbol_table::resolve): Likewise. * symtab.cc (Symbol_table::wrap_symbol): Likewise. Remove object parameter. Change all callers. (Symbol_table::add_from_object): Get target from parameters. (Symbol_table::add_from_relobj): Don't check object target. (Symbol_table::add_from_dynobj): Likewise. (Symbol_table::define_special_symbol): Get target from parameters. * symtab.h (class Symbol_table): Update declaration. * testsuite/binary_unittest.cc (gold_testsuite): Remove target parameter. Change all callers. Clear parameter target. (Binary_test): Test target here. * testsuite/object_unittest.cc (gold_testsuite): Remove target_test_pointer parameter. Change all callers. (Object_test): Test target here.
2009-08-05*** empty log message ***Sriraman Tallam1-0/+10
2009-07-17 PR 10400Ian Lance Taylor1-6/+3
* layout.h: #include <map>. (class Kept_section): Change from struct to class. Add accessors and setters. Add section size to Comdat_group mapping. Change Comdat_group to std::map. Add is_comdat_ field. Add linkonce_size field in union. (class Layout): Update declaration of find_or_add_kept_section. Don't declare find_kept_object. * layout.cc (Layout::find_or_add_kept_section): Remove candidate parameter. Add object, shndx, is_comdat, and is_group_name parameters. Change all callers. Adjust for new Kept_section. (Layout::find_kept_object): Remove. * object.cc (Sized_relobj::include_section_group): Update use of Kept_section. Rename secnum to shndx. Only record Kept_comdat_section if sections are the same size. (Sized_relobj::include_linkonce_section): Update use of Kept_section. Only record Kept_comdat_section if sections are the same size. Set size of linkonce section. (Sized_relobj::map_to_kept_section): Update call to get_kept_comdat_section. * object.h (class Sized_relobj): Rename fields in Kept_comdat_section to drop trailing underscores; change object field to Relobj*. Change Kept_comdat_section_table to store struct rather than pointer. (Sized_relobj::set_kept_comdat_section): Remove kept parameter. Add kept_object and kept_shndx parameters. Change all callers. (Sized_relobj::get_kept_comdat_section): Change return type to bool. Add kept_object and kept_shndx parameters. Change all callers. * plugin.cc (Pluginobj::include_comdat_group): Update call to Layout::find_or_add_kept_section.
2009-05-15 * gold.h (Incremental_argument_list): Remove (invalid) forwardIan Lance Taylor1-0/+3
declaration. * incremental.cc (Incremental_inputs::report_achive): New method. (Incremental_inputs::report_object): New method. (Incremental_inputs::report_script): New method. (Incremental_inputs::finalize_inputs): New method. (Incremental_inputs::finalize): Call finalize_inputs(). (Incremental_inputs::sized_create_incremental_inputs_section_data): Create inputs entries. * incremental.h (Incremental_input_type): New enum. (Incremental_inputs::Incremental_input): Initialize new fields. (Incremental_inputs::report_inputs): New method. (Incremental_inputs::report_achive): New method. (Incremental_inputs::report_object): New method. (Incremental_inputs::report_script): New method. (Incremental_inputs::finalize_inputs): New method. (Incremental_inputs::Input_info): New struct. (Incremental_inputs::Input_info_map): New typedef. (Incremental_inputs::lock_): New field. (Incremental_inputs::Inputs_): New field. (Incremental_inputs::Inputs_map): New field. * main.cc (main): Call Incremental_input::report_inputs. * options.h (Input_argument_list): Typedef moved from Input_arguments. (Input_file_group::Files): Remove, use ::Input_argument_list. (Input_file_group::Input_argument_list): Remove, use ::Input_argument_list. * plugin.cc (Plugin_manager::add_input_file): Add error in incremental build. * read_syms.cc (do_read_syms): Call Incremental_input::report_* functions. * script.cc (read_input_script): Call Incremental_input::report_script. * script.h (Script_info): New class.
2009-03-14 * readsyms.cc (Read_symbols::incompatible_warning): New function.Ian Lance Taylor1-0/+1
(Read_symbols::requeue): New function. (Read_symbols::do_read_symbols): If make_elf_object fails because the target type is not configured, and the file was searched for, issue a warning and retry with the next directory. (Add_symbols::run): If the file has an incompatible format, and it was searched for, requeue the Read_symbols task. On error, release the object. * readsyms.h (class Read_symbols): Add dirindex_ field. Add dirindex parameter to constructor. Change all callers. Declare incompatible_warning and requeue. (class Add_symbols): Add dirpath_, dirindex_, mapfile_, input_argument_ and input_group_ fields. Add them to constructor. Change all callers. (class Read_script): Add dirindex_ field. Add it to constructor. Change all callers. * archive.cc (Archive::setup): Remove input_objects parameter. Change all callers. (Archive::get_file_and_offset): Likewise. (Archive::read_all_symbols): Likewise. (Archive::read_symbols): Likewise. (Archive::get_elf_object_for_member): Remove input_objects parameter. Add punconfigured parameter. Change all callers. (Archive::add_symbols): Change return type to bool. Check return value of include_member. (Archive::include_all_members): Likewise. (Archive::include_member): Change return type to bool. Return false if first included object has incompatible target. Set included_member_ field. (Add_archive_symbols::run): If add_symbols returns false, requeue Read_symbols task. * archive.h (class Archive): Add included_member_ field. Initialize it in constructor. Add input_file and searched_for methods. Update declarations. (class Add_archive_symbols): Add dirpath_, dirindex_, and input_argument_ fields. Add them to constructor. Change all callers. * script.cc: Include "target-select.h". (class Parser_closure): Add skip_on_incompatible_target_ and found_incompatible_target_ fields. Add skip_on_incompatible_target parameter to constructor. Change all callers. Add methods skip_on_incompatible_target, clear_skip_on_incompatible_target, found_incompatible_target, and set_found_incompatible_target. (read_input_script): Add dirindex parameter. Change all callers. If parser finds an incompatible target, requeue Read_symbols task. (script_set_symbol): Clear skip_on_incompatible_target in closure. (script_add_assertion, script_parse_option): Likewise. (script_start_sections, script_add_phdr): Likewise. (script_check_output_format): New function. * script.h (read_input_script): Update declaration. * script-c.h (script_check_output_format): Declare. * yyscript.y (file_cmd): Handle OUTPUT_FORMAT. (ignore_cmd): Remove OUTPUT_FORMAT. * fileread.cc (Input_file::Input_file): Add explicit this. (Input_file::will_search_for): New function. (Input_file::open): Add pindex parameter. Change all callers. * fileread.h (class Input_file): Add input_file_argument method. Declare will_search_for. Update declarations. * object.cc (make_elf_object): Add punconfigured parameter. Change all callers. * object.h (class Object): Make input_file public. Add searched_for method. (make_elf_object): Update declaration. * dirsearch.cc (Dirsearch::find): Add pindex parameter. Use it to restart search. * dirsearch.h (class Dirsearch): Update declaration. * options.h (class General_options): Add --warn-search-mismatch. * parameters.cc (Parameters::is_compatible_target): New function. * parameters.h (class Parameters): Declare is_compatible_target. * workqueue.cc (Workqueue::add_blocker): New function. * workqueue.h (class Workqueue): Declare add_blocker.
2009-03-13 * fileread.cc (Input_file::open): Remove options parameter.Ian Lance Taylor1-2/+1
Change all callers. (Input_file::open_binary): Likewise. * script.cc (read_input_script): Likewise. * readsyms.h (class Read_symbols): Remove options_ field. Remove options parameter from constructor. Change all callers. (class Read_script): Likewise. * fileread.h (class Input_file): Update declarations. * script.h (read_input_script): Update declaration.
2009-03-01 * layout.cc (Layout::find_or_add_kept_section): New function.Ian Lance Taylor1-1/+6
(Layout::add_comdat): Removed. * layout.h (struct Kept_section): Move out of class Layout. Remove trailing underscores from field names. Add group_sections field. Rename group_ field to is_group. Change all uses. (class Layout): Declare find_or_add_kept_section, not add_comdat. * object.cc (Sized_relobj::Sized_relobj): Don't initialize comdat_groups_ field. (Sized_relobj::include_section_group): Use find_or_add_kept_section and Kept_section::group_sections. (Sized_relobj::include_linkonce_section): Likewise. * object.cc (class Sized_relobj): Don't define Comdat_group or Comdat_group_table. Remove find_comdat_group and add_comdat_group. Remove comdat_groups_ field. * plugin.cc (include_comdat_group): Use Layout::find_or_add_kept_section.
2009-02-13 (From Rafael Espindola)Cary Coutant1-46/+1
* archive.cc (Archive::include_member): Update calls to add_symbols. * dynobj.cc (Sized_dynobj<size, big_endian>::make_version_map): Add the Layout argument. * dynobj.h (do_add_symbols): Add the Layout argument. * object.cc (Sized_relobj<size, big_endian>::do_add_symbols): Add the Layout argument. * object.h (Object::add_symbols): Add the Layout argument. (Object::do_add_symbols): Add the Layout argument. (Sized_relobj::do_add_symbols): Add the Layout argument. * plugin.cc (Sized_pluginobj<size, big_endian>::do_add_symbols): Unify the two versions. (Add_plugin_symbols): Remove. * plugin.h (Pluginobj::add_symbols, Pluginobj::do_add_symbols): Remove. (Sized_pluginobj::do_add_symbols): Unify the two versions. (Add_plugin_symbols): Remove. * readsyms.cc (Read_symbols::do_read_symbols): Update call to Add_symbols. Use Add_symbols instead of Add_plugin_symbols. (Add_symbols::run): Make it work with Pulginobj.
2009-01-282009-01-20 Sriraman Tallam <tmsriram@google.com>Sriraman Tallam1-4/+2
* Makefile.am (CCFILES): Add gc.cc. (HFILES): Add gc.h. * Makefile.in: Regenerate. * gold.cc (Gc_runner): New class. (queue_initial_tasks): Call garbage collection related tasks when corresponding options are invoked. (queue_middle_gc_tasks): New function. (queue_middle_tasks): Reorder tasks to allow relocs to be read and processed early before laying out sections during garbage collection. * gold.h (queue_middle_gc_tasks): New function. (is_prefix_of): Move from "layout.cc". * i386.cc (Target_i386::gc_process_relocs): New function. * layout.cc (is_prefix_of): Remove. Move to "gold.h" * main.cc (main): Create object of class "Garbage_collection". * object.cc (Relobj::copy_symbols_data): New function. (Relobj::is_section_name_included): New function. (Sized_relobj::do_layout): Allow this function to be called twice during garbage collection and defer layout of section during the first call. * object.h (Relobj::get_symbols_data): New function. (Relobj::is_section_name_included): New function. (Relobj::copy_symbols_data): New function. (Relobj::set_symbols_data): New function. (Relobj::get_relocs_data): New function. (Relobj::set_relocs_data): New function. (Relobj::is_output_section_offset_invalid): New pure virtual function. (Relobj::gc_process_relocs): New function. (Relobj::do_gc_process_relocs): New pure virtual function. (Relobj::sd_): New data member. (Sized_relobj::is_output_section_offset_invalid): New function. (Sized_relobj::do_gc_process_relocs): New function. * options.h (General_options::gc_sections): Modify to not be a no-op. (General_options::print_gc_sections): New option. * plugin.cc (Plugin_finish::run): Remove function call to Plugin_manager::layout_deferred_objects. Move it to "gold.cc". * powerpc.cc (Target_powerpc::gc_process_relocs): New function. * reloc.cc (Read_relocs::run): Add task to process relocs and determine unreferenced sections when doing garbage collection. (Gc_process_relocs): New class. (Sized_relobj::do_gc_process_relocs): New function. (Sized_relobj::do_scan_relocs): Don't try to scan the relocs for sections that are garbage collected. * reloc.h (Gc_process_relocs): New class. * sparc.cc (Target_sparc::gc_process_relocs): New function. * symtab.cc (Symbol::should_add_dynsym_entry): Do not add entries for symbols whose corresponding sections are garbage collected. (Symbol_table::Symbol_table): Add new parameter for the garbage collection object. (Symbol_table::gc_mark_undef_symbols): New function. (Symbol_table::gc_mark_symbol_for_shlib): New function. (Symbol_table::gc_mark_dyn_syms): New function. (Symbol_table::resolve): Do not treat symbols seen in dynamic objects as garbage. (Symbol_table::add_from_object): Likewise. (Symbol_table::add_from_relobj): When building shared objects, do not treat externally visible symbols as garbage. (Symbol_table::sized_finalize_symbol): Do not check dynamic symbol table information for static and relocatable links. * symtab.h (Symbol_table::set_gc): New function. (Symbol_table::gc): New function. (Symbol_table::gc_mark_undef_symbols): New function. (Symbol_table::gc_mark_symbol_for_shlib): New function. (Symbol_table::gc_mark_dyn_syms): New function. (Symbol_table::gc_): New data member. * target.h (Sized_target::gc_process_relocs): New pure virtual function. * x86_64.cc (Target_x86_64::gc_process_relocs): New function. * testsuite/testfile.cc (Target_test::gc_process_relocs): New function.
2009-01-15 * archive.cc (Archive::get_elf_object_for_member): Remove callCary Coutant1-14/+88
to File_read::claim_for_plugin. * descriptors.cc (Descriptors::open): Remove reference to is_claimed. (Descriptors::claim_for_plugin): Remove. * descriptors.h (Descriptors::claim_for_plugin): Remove. (Descriptors::is_claimed): Remove. (claim_descriptor_for_plugin): Remove. * fileread.cc (File_read::claim_for_plugin): Remove. * fileread.h (File_read::claim_for_plugin): Remove. (File_read::descriptor): Reopen descriptor if necessary. * plugin.cc (Plugin::load): Add two new APIs to transfer vector. (Plugin_manager::all_symbols_read): Add task parameter. Change all callers. (Plugin_manager::get_input_file): New function. (Plugin_manager::release_input_file): New function. (Pluginobj::Pluginobj): Add filesize parameter and initialize corresponding data member. (Sized_pluginobj::Sized_pluginobj): Add filesize parameter and pass to base constructor. Change all callers. (get_input_file, release_input_file): New functions. (make_sized_plugin_object): Add filesize parameter. Change all callers. * plugin.h (Plugin_manager::Plugin_manager): Initialize task_ member. (Plugin_manager::all_symbols_read): Add task parameter. (Plugin_manager::get_input_file): New function. (Plugin_manager::release_input_file): New function. (Plugin_manager::task_): New data member. (Pluginobj::Pluginobj): Add filesize parameter. (Pluginobj::filename): New function. (Pluginobj::descriptor): New function. (Pluginobj::filesize): New function. (Pluginobj::filesize_): New data member. (Sized_pluginobj::Sized_pluginobj): Add filesize parameter. * readsyms.cc (Read_symbols::do_read_symbols): Remove call to File_read::claim_for_plugin; use Object::unlock to unlock the file. * testsuite/Makefile.am (plugin_test_4): New test case for plugins with archive libraries. * testsuite/Makefile.in: Regenerate. * testsuite/plugin_test.c (struct sym_info): New type. (get_input_file, release_input_file): New static variables. (onload): Capture new transfer vector entries. (claim_file_hook): Stop reading at end of file according to filesize. Factor out parsing of readelf output into separate function. (all_symbols_read_hook): Exercise get_input_file and release_input_file APIs and get the source file name from the symbol table. Convert source file name to corresponding object file name. Print info message when adding new input files. (parse_readelf_line): New function. * testsuite/plugin_test_1.sh: Add checks for new info messages. * testsuite/plugin_test_2.sh: Likewise. * testsuite/plugin_test_3.sh: Likewise. * testsuite/plugin_test_4.sh: New test case.
2008-12-24 * gold.cc (gold_exit): Call plugin cleanup handlers on exit.Cary Coutant1-3/+17
* plugin.cc (Plugin_manager::finish): Rename as layout_deferred_objects. Move cleanup to separate function. (Plugin_manager::cleanup): New function. (Plugin_finish::run): Call layout_deferred_objects and cleanup separately. * plugin.h (Plugin_manager::finish): Rename as layout_deferred_objects. (Plugin_manager::cleanup): New function. (Plugin_manager::cleanup_done): New field.
2008-12-23 * plugin.cc (is_visible_from_outside): New function.Cary Coutant1-1/+16
(Pluginobj::get_symbol_resolution_info): Call is_visible_from_outside so we don't return "IR only" status for exported symbols or -r links. * testsuite/Makefile.am (plugin_test_3): New test case. * testsuite/Makefile.in: Regenerate. * testsuite/plugin_test_3.sh: New file.
2008-12-23 * object.cc (Sized_relobj::layout_section): New function.Cary Coutant1-20/+20
(Sized_relobj::do_layout): Defer layout of input sections until after plugin has provided replacement files. (Sized_relobj::do_layout_deferred_sections): New function. * object.h (Relobj::set_section_offset): Remove virtual keyword. (Relobj::layout_deferred_sections): New function. (Relobj::do_layout_deferred_sections): New function. (Sized_relobj::do_layout_deferred_sections): New function. (Sized_relobj::layout_section): New function. (Sized_relobj::Deferred_layout): New structure. (Sized_relobj::deferred_layout_): New field. * plugin.cc (Plugin_manager::finish): Renamed, was cleanup. Change all callers. Layout deferred sections. (class Plugin_finish): Renamed, was Plugin_cleanup. Change all references. (Plugin_hook::run): Move code from do_plugin_hook inline. (Plugin_hook::do_plugin_hook): Remove. * plugin.h (Plugin_manager::Plugin_manager): Add missing initializers. (Plugin_manager::finish): Renamed, was cleanup. (Plugin_manager::should_defer_layout): New function. (Plugin_manager::add_deferred_layout_object): New function. (Plugin_manager::Deferred_layout_list): New type. (Plugin_manager::deferred_layout_objects_): New field. (Plugin_hook::do_plugin_hook): Remove.
2008-12-16 * plugin.cc (Plugin::load): Move LDPT_MESSAGE to front of transferCary Coutant1-13/+14
vector. (Plugin_manager::claim_file): Create plugin object even if plugin did not call the add_symbols callback. (Plugin_obj::get_symbol_resolution_info): Guard against plugin asking for more symbols than were added. * testsuite/Makefile.am (plugin_test_1): Add test case with no global symbols. (empty.syms): New target. * testsuite/Makefile.in: Regenerate. * testsuite/plugin_test.c (claim_file_hook): Add new debug message. Don't call add_symbols if no globals. (all_symbols_read_hook): Don't provide replacement for empty claimed file.
2008-12-052008-12-05 Rafael Avila de Espindola <espindola@google.com>Cary Coutant1-25/+8
* options.cc (General_options::parse_plugin_opt): New. (General_options::add_plugin): The argument now is just the filename. (General_options::add_plugin_option): New. * options.h (plugin_opt): New. (add_plugin): Change argument name. (add_plugin_option): New. * plugin.cc (Plugin::load): Don't parse the plugin option. * plugin.h (Plugin::Plugin): Rename argument. Init filename_. (Plugin::add_option): New. (Plugin::args_): Change type. (Plugin::filename_): New. (Plugin_manager::add_plugin_option): New. * testsuite/Makefile.am (plugin_test_1): Use new syntax. * testsuite/Makefile.in: Regenerate.
2008-12-01gold/ChangeLog:Cary Coutant1-3/+3
* plugin.cc (ld_plugin_message): Change format parameter to const. Fix mismatch between new[] and delete. include/ChangeLog: * plugin-api.h (ld_plugin_message): Change format parameter to const.
2008-10-02 * plugin.cc (make_sized_plugin_object): Fix conditionalCary Coutant1-4/+20
compilation to work when not all targets are enabled.
2008-09-19Add plugin functionality for link-time optimization (LTO).Cary Coutant1-0/+968
include/: * plugin-api.h: New file. gold/: * configure.ac (plugins): Add --enable-plugins option. * configure: Regenerate. * config.in: Regenerate. * Makefile.am (LIBDL): New variable. (CCFILES): Add plugin.cc. (HFILES): Add plugin.h. (ldadd_var): Add LIBDL. * Makefile.in: Regenerate. * archive.cc: Include "plugin.h". (Archive::setup): Don't preread archive symbols when using a plugin. (Archive::get_file_and_offset): Add memsize parameter. Change callers. (Archive::get_elf_object_for_member): Call plugin hooks for claiming files. (Archive::include_member): Add symbols from plugin objects. * archive.h (Archive::get_file_and_offset): Add memsize parameter. * descriptors.cc (Descriptors::open): Check for file descriptors abandoned by plugins. (Descriptors::claim_for_plugin): New function. * descriptors.h (Descriptors::claim_for_plugin): New function. (Open_descriptor::is_claimed): New field. (claim_descriptor_for_plugin): New function. * fileread.cc (File_read::claim_for_plugin): New function. * fileread.h (File_read::claim_for_plugin): New function. (File_read::descriptor): New function. * gold.cc: Include "plugin.h". (queue_initial_tasks): Add task to call plugin hooks for generating new object files. * main.cc: Include "plugin.h". (main): Load plugin libraries. * object.h (Pluginobj): Declare. (Object::pluginobj): New function. (Object::do_pluginobj): New function. (Object::set_target): New function. * options.cc: Include "plugin.h". (General_options::parse_plugin): New function. (General_options::General_options): Initialize plugins_ field. (General_options::add_plugin): New function. * options.h (Plugin_manager): Declare. (General_options): Add --plugin option. (General_options::has_plugins): New function. (General_options::plugins): New function. (General_options::add_plugin): New function. (General_options::plugins_): New field. * plugin.cc: New file. * plugin.h: New file. * readsyms.cc: Include "plugin.h". (Read_symbols::do_read_symbols): Check for archive before checking for ELF file. Call plugin hooks to claim files. * resolve.cc (Symbol_table::resolve): Record when symbol is referenced from a real object file; force override when processing replacement files. * symtab.cc (Symbol::init_fields): Initialize in_real_elf_ field. (Symbol::init_base_object): Likewise. (Symbol::init_base_output_data): Likewise. (Symbol::init_base_output_segment): Likewise. (Symbol::init_base_constant): Likewise. (Symbol::init_base_undefined): Likewise. (Symbol::output_section): Assert that object is not a plugin. (Symbol_table::add_from_pluginobj): New function. (Symbol_table::sized_finalize_symbol): Treat symbols from plugins as undefined. (Symbol_table::sized_write_globals): Likewise. (Symbol_table::add_from_pluginobj): Instantiate template. * symtab.h (Sized_pluginobj): Declare. (Symbol::in_real_elf): New function. (Symbol::set_in_real_elf): New function. (Symbol::in_real_elf_): New field. (Symbol_table::add_from_pluginobj): New function. * testsuite/Makefile.am (AM_CFLAGS): New variable. (LIBDL): New variable. (LDADD): Add LIBDL. (check_PROGRAMS): Add plugin_test_1 and plugin_test_2. (check_SCRIPTS): Add plugin_test_1.sh and plugin_test_2.sh. (check_DATA): Add plugin_test_1.err and plugin_test_2.err. (MOSTLYCLEANFILES): Likewise. * testsuite/Makefile.in: Regenerate. * testsuite/plugin_test.c: New file. * testsuite/plugin_test_1.sh: New file. * testsuite/plugin_test_2.sh: New file.