290 lines
8.7 KiB
C++
290 lines
8.7 KiB
C++
// main.cc -- gold main function.
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// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#include "gold.h"
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#include <cstdio>
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#include <cstring>
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#ifdef HAVE_MALLINFO
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#include <malloc.h>
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#endif
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#include "libiberty.h"
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#include "script.h"
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#include "options.h"
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#include "parameters.h"
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#include "errors.h"
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#include "mapfile.h"
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#include "dirsearch.h"
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#include "workqueue.h"
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#include "object.h"
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#include "archive.h"
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#include "symtab.h"
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#include "layout.h"
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#include "plugin.h"
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#include "gc.h"
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#include "icf.h"
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#include "incremental.h"
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#include "timer.h"
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using namespace gold;
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// This function emits the commandline to a hard-coded file in temp.
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// This is useful for debugging since ld is typically invoked by gcc,
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// so its commandline is not always easy to extract. You should be
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// able to run 'gcc -B... foo.o -o foo' to invoke this linker the
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// first time, and then /tmp/ld-run-foo.sh to invoke it on subsequent
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// runes. "/tmp/ld-run-foo.sh debug" will run the linker inside gdb
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// (or whatever value the environment variable GDB is set to), for
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// even easier debugging. Since this is a debugging-only tool, and
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// creates files, it is only turned on when the user explicitly asks
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// for it, by compiling with -DDEBUG. Do not do this for release
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// versions of the linker!
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#ifdef DEBUG
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#include <stdio.h>
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#include <sys/stat.h> // for chmod()
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static std::string
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collect_argv(int argc, char** argv)
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{
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// This is used by write_debug_script(), which wants the unedited argv.
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std::string args;
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for (int i = 0; i < argc; ++i)
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{
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args.append(" '");
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// Now append argv[i], but with all single-quotes escaped
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const char* argpos = argv[i];
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while (1)
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{
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const int len = strcspn(argpos, "'");
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args.append(argpos, len);
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if (argpos[len] == '\0')
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break;
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args.append("'\"'\"'");
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argpos += len + 1;
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}
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args.append("'");
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}
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return args;
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}
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static void
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write_debug_script(std::string filename_str,
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const char* argv_0, const char* args)
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{
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size_t slash = filename_str.rfind('/');
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if (slash != std::string::npos)
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filename_str = filename_str.c_str() + slash + 1;
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filename_str = std::string("/tmp/ld-run-") + filename_str + ".sh";
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const char* filename = filename_str.c_str();
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FILE* fp = fopen(filename, "w");
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if (fp)
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{
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fprintf(fp, "[ \"$1\" = debug ]"
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" && PREFIX=\"${GDB-gdb} --annotate=3 --fullname %s --args\""
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" && shift\n",
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argv_0);
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fprintf(fp, "$PREFIX%s $*\n", args);
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fclose(fp);
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chmod(filename, 0755);
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}
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else
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filename = "[none]";
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fprintf(stderr, "Welcome to gold! Commandline written to %s.\n", filename);
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fflush(stderr);
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}
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#else // !defined(DEBUG)
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static inline std::string
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collect_argv(int, char**)
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{
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return "";
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}
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static inline void
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write_debug_script(std::string, const char*, const char*)
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{
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}
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#endif // !defined(DEBUG)
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int
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main(int argc, char** argv)
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{
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#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
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setlocale (LC_MESSAGES, "");
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#endif
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#if defined (HAVE_SETLOCALE)
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setlocale (LC_CTYPE, "");
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#endif
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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program_name = argv[0];
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// In libiberty; expands @filename to the args in "filename".
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expandargv(&argc, &argv);
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// This is used by write_debug_script(), which wants the unedited argv.
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std::string args = collect_argv(argc, argv);
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Errors errors(program_name);
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// Initialize the global parameters, to let random code get to the
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// errors object.
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set_parameters_errors(&errors);
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// Handle the command line options.
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Command_line command_line;
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command_line.process(argc - 1, const_cast<const char**>(argv + 1));
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Timer timer;
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if (command_line.options().stats())
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timer.start();
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// Store some options in the globally accessible parameters.
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set_parameters_options(&command_line.options());
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// Do this as early as possible (since it prints a welcome message).
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write_debug_script(command_line.options().output_file_name(),
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program_name, args.c_str());
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// If the user asked for a map file, open it.
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Mapfile* mapfile = NULL;
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if (command_line.options().user_set_Map())
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{
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mapfile = new Mapfile();
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if (!mapfile->open(command_line.options().Map()))
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{
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delete mapfile;
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mapfile = NULL;
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}
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}
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// The GNU linker ignores version scripts when generating
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// relocatable output. If we are not compatible, then we break the
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// Linux kernel build, which uses a linker script with -r which must
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// not force symbols to be local. It would actually be useful to
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// permit symbols to be forced local with -r, though, as it would
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// permit some linker optimizations. Perhaps we need yet another
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// option to control this. FIXME.
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if (parameters->options().relocatable())
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command_line.script_options().version_script_info()->clear();
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// Load plugin libraries.
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if (command_line.options().has_plugins())
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command_line.options().plugins()->load_plugins();
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// The work queue.
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Workqueue workqueue(command_line.options());
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// The list of input objects.
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Input_objects input_objects;
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// The Garbage Collection (GC, --gc-sections) Object.
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Garbage_collection gc;
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// The Identical Code Folding (ICF, --icf) Object.
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Icf icf;
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// The symbol table. We're going to guess here how many symbols
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// we're going to see based on the number of input files. Even when
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// this is off, it means at worst we don't quite optimize hashtable
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// resizing as well as we could have (perhap using more memory).
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Symbol_table symtab(command_line.number_of_input_files() * 1024,
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command_line.version_script());
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if (parameters->options().gc_sections())
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symtab.set_gc(&gc);
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if (parameters->options().icf_enabled())
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symtab.set_icf(&icf);
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// The layout object.
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Layout layout(command_line.number_of_input_files(),
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&command_line.script_options());
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if (layout.incremental_inputs() != NULL)
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{
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layout.incremental_inputs()->report_command_line(argc, argv);
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layout.incremental_inputs()->report_inputs(command_line.inputs());
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}
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// Get the search path from the -L options.
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Dirsearch search_path;
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search_path.initialize(&workqueue, &command_line.options().library_path());
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// Queue up the first set of tasks.
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queue_initial_tasks(command_line.options(), search_path,
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command_line, &workqueue, &input_objects,
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&symtab, &layout, mapfile);
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// Run the main task processing loop.
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workqueue.process(0);
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if (command_line.options().stats())
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{
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Timer::TimeStats elapsed = timer.get_elapsed_time();
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fprintf(stderr,
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_("%s: total run time: " \
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"(user: %ld.%06ld sys: %ld.%06ld wall: %ld.%06ld)\n"),
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program_name,
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elapsed.user / 1000, (elapsed.user % 1000) * 1000,
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elapsed.sys / 1000, (elapsed.user % 1000) * 1000,
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elapsed.wall / 1000, (elapsed.wall % 1000) * 1000);
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#ifdef HAVE_MALLINFO
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struct mallinfo m = mallinfo();
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fprintf(stderr, _("%s: total space allocated by malloc: %d bytes\n"),
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program_name, m.arena);
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#endif
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File_read::print_stats();
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Archive::print_stats();
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fprintf(stderr, _("%s: output file size: %lld bytes\n"),
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program_name, static_cast<long long>(layout.output_file_size()));
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symtab.print_stats();
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layout.print_stats();
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}
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if (mapfile != NULL)
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mapfile->close();
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// Issue defined symbol report.
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if (command_line.options().user_set_print_symbol_counts())
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input_objects.print_symbol_counts(&symtab);
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if (parameters->options().fatal_warnings()
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&& errors.warning_count() > 0
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&& errors.error_count() == 0)
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gold_error("treating warnings as errors");
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// If the user used --noinhibit-exec, we force the exit status to be
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// successful. This is compatible with GNU ld.
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gold_exit(errors.error_count() == 0
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|| parameters->options().noinhibit_exec());
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}
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