X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=gold%2Fgold.cc;h=f02d2aadaf7367efcefd9be67a3e61880dda6185;hb=1424c35d071e7d49a4a219c7dee8c88ffd60ddca;hp=0b901bb120d7caabae3b640c84882a6515953d67;hpb=26d3c67de1d0e6434dabb908e5a6fa002f5b1db8;p=binutils-gdb.git diff --git a/gold/gold.cc b/gold/gold.cc index 0b901bb120d..f02d2aadaf7 100644 --- a/gold/gold.cc +++ b/gold/gold.cc @@ -1,6 +1,6 @@ // gold.cc -- main linker functions -// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. +// Copyright (C) 2006-2020 Free Software Foundation, Inc. // Written by Ian Lance Taylor . // This file is part of gold. @@ -30,6 +30,7 @@ #include "libiberty.h" #include "options.h" +#include "target-select.h" #include "debug.h" #include "workqueue.h" #include "dirsearch.h" @@ -44,6 +45,7 @@ #include "gc.h" #include "icf.h" #include "incremental.h" +#include "timer.h" namespace gold { @@ -58,15 +60,15 @@ process_incremental_input(Incremental_binary*, unsigned int, Input_objects*, Task_token*, Task_token*); void -gold_exit(bool status) +gold_exit(Exit_status status) { if (parameters != NULL && parameters->options_valid() && parameters->options().has_plugins()) parameters->options().plugins()->cleanup(); - if (!status && parameters != NULL && parameters->options_valid()) + if (status != GOLD_OK && parameters != NULL && parameters->options_valid()) unlink_if_ordinary(parameters->options().output_file_name()); - exit(status ? EXIT_SUCCESS : EXIT_FAILURE); + exit(status); } void @@ -87,7 +89,7 @@ gold_nomem() const char* const s = ": out of memory\n"; len = write(2, s, strlen(s)); } - gold_exit(false); + gold_exit(GOLD_ERR); } // Handle an unreachable case. @@ -97,7 +99,7 @@ do_gold_unreachable(const char* filename, int lineno, const char* function) { fprintf(stderr, _("%s: internal error in %s, at %s:%d\n"), program_name, function, filename, lineno); - gold_exit(false); + gold_exit(GOLD_ERR); } // This class arranges to run the functions done in the middle of the @@ -134,7 +136,7 @@ Middle_runner::run(Workqueue* workqueue, const Task* task) // This class arranges the tasks to process the relocs for garbage collection. -class Gc_runner : public Task_function_runner +class Gc_runner : public Task_function_runner { public: Gc_runner(const General_options& options, @@ -159,9 +161,9 @@ class Gc_runner : public Task_function_runner void Gc_runner::run(Workqueue* workqueue, const Task* task) { - queue_middle_gc_tasks(this->options_, task, this->input_objects_, - this->symtab_, this->layout_, workqueue, - this->mapfile_); + queue_middle_gc_tasks(this->options_, task, this->input_objects_, + this->symtab_, this->layout_, workqueue, + this->mapfile_); } // Queue up the initial set of tasks for this link job. @@ -173,10 +175,18 @@ queue_initial_tasks(const General_options& options, Workqueue* workqueue, Input_objects* input_objects, Symbol_table* symtab, Layout* layout, Mapfile* mapfile) { - if (cmdline.begin() == cmdline.end()) + if (cmdline.number_of_input_files() == 0) { + bool is_ok = false; if (options.printed_version()) - gold_exit(true); + is_ok = true; + if (options.print_output_format()) + { + print_output_format(); + is_ok = true; + } + if (is_ok) + gold_exit(GOLD_OK); gold_fatal(_("no input files")); } @@ -188,43 +198,29 @@ queue_initial_tasks(const General_options& options, // For incremental links, the base output file. Incremental_binary* ibase = NULL; - if (parameters->incremental()) + if (parameters->incremental_update()) { - if (options.relocatable()) - gold_error(_("incremental linking is incompatible with -r")); - if (options.emit_relocs()) - gold_error(_("incremental linking is incompatible with --emit-relocs")); - if (options.gc_sections()) - gold_error(_("incremental linking is incompatible with --gc-sections")); - if (options.icf_enabled()) - gold_error(_("incremental linking is incompatible with --icf")); - if (options.has_plugins()) - gold_error(_("incremental linking is incompatible with --plugin")); - - if (parameters->incremental_update()) + Output_file* of = new Output_file(options.output_file_name()); + if (of->open_base_file(options.incremental_base(), true)) { - Output_file* of = new Output_file(options.output_file_name()); - if (of->open_base_file(options.incremental_base(), true)) - { - ibase = open_incremental_binary(of); - if (ibase != NULL - && ibase->check_inputs(cmdline, layout->incremental_inputs())) - ibase->init_layout(layout); - else - { - delete ibase; - ibase = NULL; - of->close(); - } - } - if (ibase == NULL) + ibase = open_incremental_binary(of); + if (ibase != NULL + && ibase->check_inputs(cmdline, layout->incremental_inputs())) + ibase->init_layout(layout); + else { - if (set_parameters_incremental_full()) - gold_info(_("linking with --incremental-full")); - else - gold_fatal(_("restart link with --incremental-full")); + delete ibase; + ibase = NULL; + of->close(); } } + if (ibase == NULL) + { + if (set_parameters_incremental_full()) + gold_info(_("linking with --incremental-full")); + else + gold_fallback(_("restart link with --incremental-full")); + } } // Read the input files. We have to add the symbols to the symbol @@ -291,21 +287,21 @@ queue_initial_tasks(const General_options& options, { workqueue->queue(new Task_function(new Gc_runner(options, input_objects, - symtab, - layout, - mapfile), - this_blocker, - "Task_function Gc_runner")); + symtab, + layout, + mapfile), + this_blocker, + "Task_function Gc_runner")); } else { workqueue->queue(new Task_function(new Middle_runner(options, - input_objects, - symtab, - layout, - mapfile), - this_blocker, - "Task_function Middle_runner")); + input_objects, + symtab, + layout, + mapfile), + this_blocker, + "Task_function Middle_runner")); } } @@ -471,12 +467,12 @@ queue_middle_gc_tasks(const General_options& options, } workqueue->queue(new Task_function(new Middle_runner(options, - input_objects, - symtab, - layout, - mapfile), - this_blocker, - "Task_function Middle_runner")); + input_objects, + symtab, + layout, + mapfile), + this_blocker, + "Task_function Middle_runner")); } // Queue up the middle set of tasks. These are the tasks which run @@ -492,26 +488,36 @@ queue_middle_tasks(const General_options& options, Workqueue* workqueue, Mapfile* mapfile) { + Timer* timer = parameters->timer(); + if (timer != NULL) + timer->stamp(0); + + // We have to support the case of not seeing any input objects, and + // generate an empty file. Existing builds depend on being able to + // pass an empty archive to the linker and get an empty object file + // out. In order to do this we need to use a default target. + if (input_objects->number_of_input_objects() == 0 + && layout->incremental_base() == NULL) + parameters_force_valid_target(); + // Add any symbols named with -u options to the symbol table. symtab->add_undefined_symbols_from_command_line(layout); // If garbage collection was chosen, relocs have been read and processed - // at this point by pre_middle_tasks. Layout can then be done for all + // at this point by pre_middle_tasks. Layout can then be done for all // objects. if (parameters->options().gc_sections()) { // Find the start symbol if any. - Symbol* start_sym = symtab->lookup(parameters->entry()); - if (start_sym != NULL) - { - bool is_ordinary; - unsigned int shndx = start_sym->shndx(&is_ordinary); - if (is_ordinary) - { - symtab->gc()->worklist().push( - Section_id(start_sym->object(), shndx)); - } - } + Symbol* sym = symtab->lookup(parameters->entry()); + if (sym != NULL) + symtab->gc_mark_symbol(sym); + sym = symtab->lookup(parameters->options().init()); + if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) + symtab->gc_mark_symbol(sym); + sym = symtab->lookup(parameters->options().fini()); + if (sym != NULL && sym->is_defined() && !sym->is_from_dynobj()) + symtab->gc_mark_symbol(sym); // Symbols named with -u should not be considered garbage. symtab->gc_mark_undef_symbols(layout); gold_assert(symtab->gc() != NULL); @@ -519,29 +525,31 @@ queue_middle_tasks(const General_options& options, symtab->gc()->do_transitive_closure(); } - // If identical code folding (--icf) is chosen it makes sense to do it - // only after garbage collection (--gc-sections) as we do not want to + // If identical code folding (--icf) is chosen it makes sense to do it + // only after garbage collection (--gc-sections) as we do not want to // be folding sections that will be garbage. if (parameters->options().icf_enabled()) { symtab->icf()->find_identical_sections(input_objects, symtab); } - // Call Object::layout for the second time to determine the - // output_sections for all referenced input sections. When - // --gc-sections or --icf is turned on, Object::layout is - // called twice. It is called the first time when the - // symbols are added. + // Call Object::layout for the second time to determine the + // output_sections for all referenced input sections. When + // --gc-sections or --icf is turned on, or when certain input + // sections have to be mapped to unique segments, Object::layout + // is called twice. It is called the first time when symbols + // are added. if (parameters->options().gc_sections() - || parameters->options().icf_enabled()) + || parameters->options().icf_enabled() + || layout->is_unique_segment_for_sections_specified()) { for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); - p != input_objects->relobj_end(); - ++p) - { - Task_lock_obj tlo(task, *p); - (*p)->layout(symtab, layout, NULL); - } + p != input_objects->relobj_end(); + ++p) + { + Task_lock_obj tlo(task, *p); + (*p)->layout(symtab, layout, NULL); + } } // Layout deferred objects due to plugins. @@ -550,36 +558,45 @@ queue_middle_tasks(const General_options& options, Plugin_manager* plugins = parameters->options().plugins(); gold_assert(plugins != NULL); plugins->layout_deferred_objects(); - } + } + + // Finalize the .eh_frame section. + layout->finalize_eh_frame_section(); + + /* If plugins have specified a section order, re-arrange input sections + according to a specified section order. If --section-ordering-file is + also specified, do not do anything here. */ + if (parameters->options().has_plugins() + && layout->is_section_ordering_specified() + && !parameters->options().section_ordering_file ()) + { + for (Layout::Section_list::const_iterator p + = layout->section_list().begin(); + p != layout->section_list().end(); + ++p) + (*p)->update_section_layout(layout->get_section_order_map()); + } if (parameters->options().gc_sections() || parameters->options().icf_enabled()) { for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); - p != input_objects->relobj_end(); - ++p) - { - // Update the value of output_section stored in rd. - Read_relocs_data* rd = (*p)->get_relocs_data(); - for (Read_relocs_data::Relocs_list::iterator q = rd->relocs.begin(); - q != rd->relocs.end(); - ++q) - { - q->output_section = (*p)->output_section(q->data_shndx); - q->needs_special_offset_handling = - (*p)->is_output_section_offset_invalid(q->data_shndx); - } - } + p != input_objects->relobj_end(); + ++p) + { + // Update the value of output_section stored in rd. + Read_relocs_data* rd = (*p)->get_relocs_data(); + for (Read_relocs_data::Relocs_list::iterator q = rd->relocs.begin(); + q != rd->relocs.end(); + ++q) + { + q->output_section = (*p)->output_section(q->data_shndx); + q->needs_special_offset_handling = + (*p)->is_output_section_offset_invalid(q->data_shndx); + } + } } - // We have to support the case of not seeing any input objects, and - // generate an empty file. Existing builds depend on being able to - // pass an empty archive to the linker and get an empty object file - // out. In order to do this we need to use a default target. - if (input_objects->number_of_input_objects() == 0 - && layout->incremental_base() == NULL) - parameters_force_valid_target(); - int thread_count = options.thread_count_middle(); if (thread_count == 0) thread_count = std::max(2, input_objects->number_of_input_objects()); @@ -614,10 +631,16 @@ queue_middle_tasks(const General_options& options, for (++p; p != input_objects->relobj_end(); ++p) { if ((*p)->uses_split_stack() != uses_split_stack) - gold_fatal(_("cannot mix split-stack '%s' and " - "non-split-stack '%s' when using -r"), - (*input_objects->relobj_begin())->name().c_str(), - (*p)->name().c_str()); + { + const char *name1 + = (*input_objects->relobj_begin())->name().c_str(); + const char *name2 = (*p)->name().c_str(); + const char *name_split = uses_split_stack ? name1 : name2; + const char *name_nosplit = uses_split_stack ? name2 : name1; + gold_fatal(_("cannot mix split-stack '%s' and " + "non-split-stack '%s' when using -r"), + name_split, name_nosplit); + } } } } @@ -638,10 +661,6 @@ queue_middle_tasks(const General_options& options, // dynamic objects that it depends upon. input_objects->check_dynamic_dependencies(); - // See if any of the input definitions violate the One Definition Rule. - // TODO: if this is too slow, do this as a task, rather than inline. - symtab->detect_odr_violations(task, options.output_file_name()); - // Do the --no-undefined-version check. if (!parameters->options().undefined_version()) { @@ -662,8 +681,11 @@ queue_middle_tasks(const General_options& options, // Define symbols from any linker scripts. layout->define_script_symbols(symtab); + // TODO(csilvers): figure out a more principled way to get the target + Target* target = const_cast(¶meters->target()); + // Attach sections to segments. - layout->attach_sections_to_segments(); + layout->attach_sections_to_segments(target); if (!parameters->options().relocatable()) { @@ -673,6 +695,9 @@ queue_middle_tasks(const General_options& options, // Define __start and __stop symbols for output sections where // appropriate. layout->define_section_symbols(symtab); + + // Define target-specific symbols. + target->define_standard_symbols(symtab, layout); } // Make sure we have symbols for any required group signatures. @@ -697,12 +722,12 @@ queue_middle_tasks(const General_options& options, || parameters->options().icf_enabled()) { for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); - p != input_objects->relobj_end(); - ++p) + p != input_objects->relobj_end(); + ++p) { Task_token* next_blocker = new Task_token(true); next_blocker->add_blocker(); - workqueue->queue(new Scan_relocs(symtab, layout, *p, + workqueue->queue(new Scan_relocs(symtab, layout, *p, (*p)->get_relocs_data(), this_blocker, next_blocker)); this_blocker = next_blocker; @@ -722,15 +747,15 @@ queue_middle_tasks(const General_options& options, // some of the sections, and thus change our minds about the types // of references made to the symbols. for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); - p != input_objects->relobj_end(); - ++p) - { + p != input_objects->relobj_end(); + ++p) + { Task_token* next_blocker = new Task_token(true); next_blocker->add_blocker(); - workqueue->queue(new Read_relocs(symtab, layout, *p, this_blocker, + workqueue->queue(new Read_relocs(symtab, layout, *p, this_blocker, next_blocker)); this_blocker = next_blocker; - } + } } if (this_blocker == NULL) @@ -742,24 +767,22 @@ queue_middle_tasks(const General_options& options, // blocker here so that we can run the layout task immediately. this_blocker = new Task_token(true); } - else + else { // If we failed to open any input files, it's possible for // THIS_BLOCKER to be NULL here. There's no real point in // continuing if that happens. gold_assert(parameters->errors()->error_count() > 0); - gold_exit(false); + gold_exit(GOLD_ERR); } } // When all those tasks are complete, we can start laying out the // output file. - // TODO(csilvers): figure out a more principled way to get the target - Target* target = const_cast(¶meters->target()); workqueue->queue(new Task_function(new Layout_task_runner(options, input_objects, symtab, - target, + target, layout, mapfile), this_blocker, @@ -777,6 +800,10 @@ queue_final_tasks(const General_options& options, Workqueue* workqueue, Output_file* of) { + Timer* timer = parameters->timer(); + if (timer != NULL) + timer->stamp(1); + int thread_count = options.thread_count_final(); if (thread_count == 0) thread_count = std::max(2, input_objects->number_of_input_objects()); @@ -790,6 +817,8 @@ queue_final_tasks(const General_options& options, if (!any_postprocessing_sections) { input_sections_blocker = new Task_token(true); + // Write_symbols_task, Relocate_tasks. + input_sections_blocker->add_blocker(); input_sections_blocker->add_blockers(input_objects->number_of_relobjs()); } @@ -818,6 +847,7 @@ queue_final_tasks(const General_options& options, // Queue a task to write out the output sections. workqueue->queue(new Write_sections_task(layout, of, output_sections_blocker, + input_sections_blocker, final_blocker)); // Queue a task to write out everything else. @@ -855,12 +885,28 @@ queue_final_tasks(const General_options& options, final_blocker = new_final_blocker; } - // Queue a task to close the output file. This will be blocked by - // FINAL_BLOCKER. - workqueue->queue(new Task_function(new Close_task_runner(&options, layout, - of), - final_blocker, - "Task_function Close_task_runner")); + // Create tasks for tree-style build ID computation, if necessary. + if (strcmp(options.build_id(), "tree") == 0) + { + // Queue a task to compute the build id. This will be blocked by + // FINAL_BLOCKER, and will in turn schedule the task to close + // the output file. + workqueue->queue(new Task_function(new Build_id_task_runner(&options, + layout, + of), + final_blocker, + "Task_function Build_id_task_runner")); + } + else + { + // Queue a task to close the output file. This will be blocked by + // FINAL_BLOCKER. + workqueue->queue(new Task_function(new Close_task_runner(&options, layout, + of, NULL, 0), + final_blocker, + "Task_function Close_task_runner")); + } + } } // End namespace gold.