| // main.cc -- gold main function. |
| |
| // Copyright (C) 2006-2024 Free Software Foundation, Inc. |
| // Written by Ian Lance Taylor <iant@google.com>. |
| |
| // This file is part of gold. |
| |
| // This program is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License as published by |
| // the Free Software Foundation; either version 3 of the License, or |
| // (at your option) any later version. |
| |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| // MA 02110-1301, USA. |
| |
| #include "gold.h" |
| |
| #include <cstdio> |
| #include <cstring> |
| |
| #if defined(HAVE_MALLINFO) || defined(HAVE_MALLINFO2) |
| #include <malloc.h> |
| #endif |
| |
| #include "libiberty.h" |
| |
| #include "script.h" |
| #include "options.h" |
| #include "target-select.h" |
| #include "parameters.h" |
| #include "errors.h" |
| #include "mapfile.h" |
| #include "dirsearch.h" |
| #include "workqueue.h" |
| #include "object.h" |
| #include "archive.h" |
| #include "symtab.h" |
| #include "layout.h" |
| #include "plugin.h" |
| #include "gc.h" |
| #include "icf.h" |
| #include "incremental.h" |
| #include "gdb-index.h" |
| #include "timer.h" |
| |
| using namespace gold; |
| |
| // This function emits the commandline to a hard-coded file in temp. |
| // This is useful for debugging since ld is typically invoked by gcc, |
| // so its commandline is not always easy to extract. You should be |
| // able to run 'gcc -B... foo.o -o foo' to invoke this linker the |
| // first time, and then /tmp/ld-run-foo.sh to invoke it on subsequent |
| // runes. "/tmp/ld-run-foo.sh debug" will run the linker inside gdb |
| // (or whatever value the environment variable GDB is set to), for |
| // even easier debugging. Since this is a debugging-only tool, and |
| // creates files, it is only turned on when the user explicitly asks |
| // for it, by compiling with -DDEBUG. Do not do this for release |
| // versions of the linker! |
| |
| #ifdef DEBUG |
| #include <stdio.h> |
| #include <sys/stat.h> // for chmod() |
| |
| static std::string |
| collect_argv(int argc, char** argv) |
| { |
| // This is used by write_debug_script(), which wants the unedited argv. |
| std::string args; |
| for (int i = 0; i < argc; ++i) |
| { |
| args.append(" '"); |
| // Now append argv[i], but with all single-quotes escaped |
| const char* argpos = argv[i]; |
| while (1) |
| { |
| const int len = strcspn(argpos, "'"); |
| args.append(argpos, len); |
| if (argpos[len] == '\0') |
| break; |
| args.append("'\"'\"'"); |
| argpos += len + 1; |
| } |
| args.append("'"); |
| } |
| return args; |
| } |
| |
| static void |
| write_debug_script(std::string filename_str, |
| const char* argv_0, const char* args) |
| { |
| size_t slash = filename_str.rfind('/'); |
| if (slash != std::string::npos) |
| filename_str = filename_str.c_str() + slash + 1; |
| filename_str = std::string("/tmp/ld-run-") + filename_str + ".sh"; |
| const char* filename = filename_str.c_str(); |
| FILE* fp = fopen(filename, "w"); |
| if (fp) |
| { |
| fprintf(fp, "[ \"$1\" = debug ]" |
| " && PREFIX=\"${GDB-gdb} --annotate=3 --fullname %s --args\"" |
| " && shift\n", |
| argv_0); |
| fprintf(fp, "$PREFIX%s $*\n", args); |
| fclose(fp); |
| chmod(filename, 0755); |
| } |
| else |
| filename = "[none]"; |
| fprintf(stderr, "Welcome to gold! Commandline written to %s.\n", filename); |
| fflush(stderr); |
| } |
| |
| #else // !defined(DEBUG) |
| |
| static inline std::string |
| collect_argv(int, char**) |
| { |
| return ""; |
| } |
| |
| static inline void |
| write_debug_script(std::string, const char*, const char*) |
| { |
| } |
| |
| #endif // !defined(DEBUG) |
| |
| |
| int |
| main(int argc, char** argv) |
| { |
| #if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES) |
| setlocale(LC_MESSAGES, ""); |
| #endif |
| #if defined (HAVE_SETLOCALE) |
| setlocale(LC_CTYPE, ""); |
| #endif |
| bindtextdomain(PACKAGE, LOCALEDIR); |
| textdomain(PACKAGE); |
| |
| program_name = argv[0]; |
| |
| // In libiberty; expands @filename to the args in "filename". |
| expandargv(&argc, &argv); |
| |
| // This is used by write_debug_script(), which wants the unedited argv. |
| std::string args = collect_argv(argc, argv); |
| |
| Errors errors(program_name); |
| |
| // Initialize the global parameters, to let random code get to the |
| // errors object. |
| set_parameters_errors(&errors); |
| |
| // Handle the command line options. |
| Command_line command_line; |
| command_line.process(argc - 1, const_cast<const char**>(argv + 1)); |
| |
| Timer timer; |
| if (command_line.options().stats()) |
| { |
| timer.start(); |
| set_parameters_timer(&timer); |
| } |
| |
| // Store some options in the globally accessible parameters. |
| set_parameters_options(&command_line.options()); |
| |
| // Do this as early as possible (since it prints a welcome message). |
| write_debug_script(command_line.options().output_file_name(), |
| program_name, args.c_str()); |
| |
| // If the user asked for a map file, open it. |
| Mapfile* mapfile = NULL; |
| if (command_line.options().user_set_Map()) |
| { |
| mapfile = new Mapfile(); |
| if (!mapfile->open(command_line.options().Map())) |
| { |
| delete mapfile; |
| mapfile = NULL; |
| } |
| } |
| |
| // The GNU linker ignores version scripts when generating |
| // relocatable output. If we are not compatible, then we break the |
| // Linux kernel build, which uses a linker script with -r which must |
| // not force symbols to be local. It would actually be useful to |
| // permit symbols to be forced local with -r, though, as it would |
| // permit some linker optimizations. Perhaps we need yet another |
| // option to control this. FIXME. |
| if (parameters->options().relocatable()) |
| command_line.script_options().version_script_info()->clear(); |
| |
| // The work queue. |
| Workqueue workqueue(command_line.options()); |
| |
| // The list of input objects. |
| Input_objects input_objects; |
| |
| // The Garbage Collection (GC, --gc-sections) Object. |
| Garbage_collection gc; |
| |
| // The Identical Code Folding (ICF, --icf) Object. |
| Icf icf; |
| |
| // The symbol table. We're going to guess here how many symbols |
| // we're going to see based on the number of input files. Even when |
| // this is off, it means at worst we don't quite optimize hashtable |
| // resizing as well as we could have (perhaps using more memory). |
| Symbol_table symtab(command_line.number_of_input_files() * 1024, |
| command_line.version_script()); |
| |
| if (parameters->options().gc_sections()) |
| symtab.set_gc(&gc); |
| |
| if (parameters->options().icf_enabled()) |
| symtab.set_icf(&icf); |
| |
| // The layout object. |
| Layout layout(command_line.number_of_input_files(), |
| &command_line.script_options()); |
| |
| if (layout.incremental_inputs() != NULL) |
| layout.incremental_inputs()->report_command_line(argc, argv); |
| |
| if (parameters->options().section_ordering_file()) |
| layout.read_layout_from_file(); |
| |
| // Load plugin libraries. |
| if (command_line.options().has_plugins()) |
| command_line.options().plugins()->load_plugins(&layout); |
| |
| // Get the search path from the -L options. |
| Dirsearch search_path; |
| search_path.initialize(&workqueue, &command_line.options().library_path()); |
| |
| // Queue up the first set of tasks. |
| queue_initial_tasks(command_line.options(), search_path, |
| command_line, &workqueue, &input_objects, |
| &symtab, &layout, mapfile); |
| |
| // Run the main task processing loop. |
| workqueue.process(0); |
| |
| if (command_line.options().print_output_format()) |
| print_output_format(); |
| |
| if (command_line.options().stats()) |
| { |
| timer.stamp(2); |
| Timer::TimeStats elapsed = timer.get_pass_time(0); |
| fprintf(stderr, |
| _("%s: initial tasks run time: " \ |
| "(user: %ld.%06ld sys: %ld.%06ld wall: %ld.%06ld)\n"), |
| program_name, |
| elapsed.user / 1000, (elapsed.user % 1000) * 1000, |
| elapsed.sys / 1000, (elapsed.sys % 1000) * 1000, |
| elapsed.wall / 1000, (elapsed.wall % 1000) * 1000); |
| elapsed = timer.get_pass_time(1); |
| fprintf(stderr, |
| _("%s: middle tasks run time: " \ |
| "(user: %ld.%06ld sys: %ld.%06ld wall: %ld.%06ld)\n"), |
| program_name, |
| elapsed.user / 1000, (elapsed.user % 1000) * 1000, |
| elapsed.sys / 1000, (elapsed.sys % 1000) * 1000, |
| elapsed.wall / 1000, (elapsed.wall % 1000) * 1000); |
| elapsed = timer.get_pass_time(2); |
| fprintf(stderr, |
| _("%s: final tasks run time: " \ |
| "(user: %ld.%06ld sys: %ld.%06ld wall: %ld.%06ld)\n"), |
| program_name, |
| elapsed.user / 1000, (elapsed.user % 1000) * 1000, |
| elapsed.sys / 1000, (elapsed.sys % 1000) * 1000, |
| elapsed.wall / 1000, (elapsed.wall % 1000) * 1000); |
| elapsed = timer.get_elapsed_time(); |
| fprintf(stderr, |
| _("%s: total run time: " \ |
| "(user: %ld.%06ld sys: %ld.%06ld wall: %ld.%06ld)\n"), |
| program_name, |
| elapsed.user / 1000, (elapsed.user % 1000) * 1000, |
| elapsed.sys / 1000, (elapsed.sys % 1000) * 1000, |
| elapsed.wall / 1000, (elapsed.wall % 1000) * 1000); |
| |
| #if defined(HAVE_MALLINFO2) |
| struct mallinfo2 m = mallinfo2(); |
| fprintf(stderr, _("%s: total space allocated by malloc: %lld bytes\n"), |
| program_name, static_cast<long long>(m.arena)); |
| #elif defined(HAVE_MALLINFO) |
| struct mallinfo m = mallinfo(); |
| fprintf(stderr, _("%s: total space allocated by malloc: %lld bytes\n"), |
| program_name, static_cast<long long>(m.arena)); |
| #endif |
| |
| File_read::print_stats(); |
| Archive::print_stats(); |
| Lib_group::print_stats(); |
| fprintf(stderr, _("%s: output file size: %lld bytes\n"), |
| program_name, static_cast<long long>(layout.output_file_size())); |
| symtab.print_stats(); |
| layout.print_stats(); |
| Gdb_index::print_stats(); |
| Free_list::print_stats(); |
| } |
| |
| // Issue defined symbol report. |
| if (command_line.options().user_set_print_symbol_counts()) |
| input_objects.print_symbol_counts(&symtab); |
| |
| // Output cross reference table. |
| if (command_line.options().cref()) |
| input_objects.print_cref(&symtab, |
| mapfile == NULL ? stdout : mapfile->file()); |
| |
| if (mapfile != NULL) |
| mapfile->close(); |
| |
| if (parameters->options().fatal_warnings() |
| && errors.warning_count() > 0 |
| && errors.error_count() == 0) |
| gold_error("treating warnings as errors"); |
| |
| // If the user used --noinhibit-exec, we force the exit status to be |
| // successful. This is compatible with GNU ld. |
| gold_exit((errors.error_count() == 0 |
| || parameters->options().noinhibit_exec()) |
| ? GOLD_OK |
| : GOLD_ERR); |
| } |