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// main.cc -- gold main function.
// Copyright 2006, 2007, 2008 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 <cstring>
#ifdef HAVE_MALLINFO
#include <malloc.h>
#endif
#include "libiberty.h"
#include "script.h"
#include "options.h"
#include "parameters.h"
#include "errors.h"
#include "dirsearch.h"
#include "workqueue.h"
#include "object.h"
#include "symtab.h"
#include "layout.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));
long start_time = 0;
if (command_line.options().stats())
start_time = get_run_time();
// 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());
// 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 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 (perhap using more memory).
Symbol_table symtab(command_line.number_of_input_files() * 1024,
command_line.version_script());
// The layout object.
Layout layout(command_line.options(), &command_line.script_options());
// 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);
// Run the main task processing loop.
workqueue.process(0);
if (command_line.options().stats())
{
long run_time = get_run_time() - start_time;
fprintf(stderr, _("%s: total run time: %ld.%06ld seconds\n"),
program_name, run_time / 1000000, run_time % 1000000);
#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();
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();
}
gold_exit(errors.error_count() == 0);
}
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