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Diffstat (limited to 'binutils-2.25/gold/main.cc')
| -rw-r--r-- | binutils-2.25/gold/main.cc | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/binutils-2.25/gold/main.cc b/binutils-2.25/gold/main.cc new file mode 100644 index 00000000..d3292981 --- /dev/null +++ b/binutils-2.25/gold/main.cc @@ -0,0 +1,332 @@ +// main.cc -- gold main function. + +// Copyright 2006, 2007, 2008, 2009, 2010, 2011 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> + +#ifdef HAVE_MALLINFO +#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); + +#ifdef HAVE_MALLINFO + struct mallinfo m = mallinfo(); + fprintf(stderr, _("%s: total space allocated by malloc: %d bytes\n"), + program_name, 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); +} |