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// main.cc -- gold main function.

// Copyright 2006, 2007, 2008, 2009, 2010 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 "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 "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();

  // 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();

  // Load plugin libraries.

  if (command_line.options().has_plugins())

    command_line.options().plugins()->load_plugins();

  // 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();

  // 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().stats())

    {

      Timer::TimeStats 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();

      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());

}