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/* Wrapper to call lto.  Used by collect2 and the linker plugin.

   Copyright (C) 2009, 2010 Free Software Foundation, Inc.

   Factored out of collect2 by Rafael Espindola <espindola@google.com>

This file is part of GCC.

GCC 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, or (at your option) any later

version.

GCC 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 GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

/* This program is passed a gcc, a list of gcc arguments and a list of

   object files containing IL. It scans the argument list to check if

   we are in whopr mode or not modifies the arguments and needed and

   prints a list of output files on stdout.

   Example:

   $ lto-wrapper gcc/xgcc -B gcc a.o b.o -o test -flto

   The above will print something like

   /tmp/ccwbQ8B2.lto.o

   If -fwhopr is used instead, more than one file might be produced

   ./ccXj2DTk.lto.ltrans.o

   ./ccCJuXGv.lto.ltrans.o

*/

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "intl.h"

#include "libiberty.h"

int debug;                              /* true if -debug */

enum lto_mode_d {

  LTO_MODE_NONE,                        /* Not doing LTO. */

  LTO_MODE_LTO,                         /* Normal LTO. */

  LTO_MODE_WHOPR                        /* WHOPR. */

};

/* Current LTO mode.  */

static enum lto_mode_d lto_mode = LTO_MODE_NONE;

static char *ltrans_output_file;

static char *flto_out;

static char *args_name;

static void maybe_unlink_file (const char *);

/* Delete tempfiles and exit function.  */

static void

lto_wrapper_exit (int status)

{

  static bool cleanup_done = false;

  if (!cleanup_done)

    {

      /* Setting cleanup_done prevents an infinite loop if one of the

         calls to maybe_unlink_file fails. */

      cleanup_done = true;

      if (ltrans_output_file)

        maybe_unlink_file (ltrans_output_file);

      if (flto_out)

        maybe_unlink_file (flto_out);

      if (args_name)

        maybe_unlink_file (args_name);

    }

  exit (status);

}

/* Just die. CMSGID is the error message. */

static void __attribute__ ((format (printf, 1, 2)))

fatal (const char * cmsgid, ...)

{

  va_list ap;

  va_start (ap, cmsgid);

  fprintf (stderr, "lto-wrapper: ");

  vfprintf (stderr, _(cmsgid), ap);

  fprintf (stderr, "\n");

  va_end (ap);

  lto_wrapper_exit (FATAL_EXIT_CODE);

}

/* Die when sys call fails. CMSGID is the error message.  */

static void __attribute__ ((format (printf, 1, 2)))

fatal_perror (const char *cmsgid, ...)

{

  int e = errno;

  va_list ap;

  va_start (ap, cmsgid);

  fprintf (stderr, "lto-wrapper: ");

  vfprintf (stderr, _(cmsgid), ap);

  fprintf (stderr, ": %s\n", xstrerror (e));

  va_end (ap);

  lto_wrapper_exit (FATAL_EXIT_CODE);

}

/* Execute a program, and wait for the reply. ARGV are the arguments. The

   last one must be NULL. */

static struct pex_obj *

collect_execute (char **argv)

{

  struct pex_obj *pex;

  const char *errmsg;

  int err;

  if (debug)

    {

      char **p_argv;

      const char *str;

      for (p_argv = argv; (str = *p_argv) != (char *) 0; p_argv++)

        fprintf (stderr, " %s", str);

      fprintf (stderr, "\n");

    }

  fflush (stdout);

  fflush (stderr);

  pex = pex_init (0, "lto-wrapper", NULL);

  if (pex == NULL)

    fatal_perror ("pex_init failed");

  errmsg = pex_run (pex, PEX_LAST | PEX_SEARCH, argv[0], argv, NULL,

                    NULL, &err);

  if (errmsg != NULL)

    {

      if (err != 0)

        {

          errno = err;

          fatal_perror (errmsg);

        }

      else

        fatal (errmsg);

    }

  return pex;

}

/* Wait for a process to finish, and exit if a nonzero status is found.

   PROG is the program name. PEX is the process we should wait for. */

static int

collect_wait (const char *prog, struct pex_obj *pex)

{

  int status;

  if (!pex_get_status (pex, 1, &status))

    fatal_perror ("can't get program status");

  pex_free (pex);

  if (status)

    {

      if (WIFSIGNALED (status))

        {

          int sig = WTERMSIG (status);

          if (WCOREDUMP (status))

            fatal ("%s terminated with signal %d [%s], core dumped",

                   prog, sig, strsignal (sig));

          else

            fatal ("%s terminated with signal %d [%s]",

                   prog, sig, strsignal (sig));

        }

      if (WIFEXITED (status))

        fatal ("%s returned %d exit status", prog, WEXITSTATUS (status));

    }

  return 0;

}

/* Unlink a temporary LTRANS file unless requested otherwise.  */

static void

maybe_unlink_file (const char *file)

{

  if (! debug)

    {

      if (unlink_if_ordinary (file))

        fatal_perror ("deleting LTRANS file %s", file);

    }

  else

    fprintf (stderr, "[Leaving LTRANS %s]\n", file);

}

/* Execute program ARGV[0] with arguments ARGV. Wait for it to finish.  */

static void

fork_execute (char **argv)

{

  struct pex_obj *pex;

  char *new_argv[3];

  char *at_args;

  FILE *args;

  int status;

  args_name = make_temp_file (".args");

  at_args = concat ("@", args_name, NULL);

  args = fopen (args_name, "w");

  if (args == NULL)

    fatal ("failed to open %s", args_name);

  status = writeargv (&argv[1], args);

  if (status)

    fatal ("could not write to temporary file %s",  args_name);

  fclose (args);

  new_argv[0] = argv[0];

  new_argv[1] = at_args;

  new_argv[2] = NULL;

  pex = collect_execute (new_argv);

  collect_wait (new_argv[0], pex);

  maybe_unlink_file (args_name);

  free (at_args);

}

/* Execute gcc. ARGC is the number of arguments. ARGV contains the arguments. */

static void

run_gcc (unsigned argc, char *argv[])

{

  unsigned i;

  unsigned new_argc = argc;

  const char **new_argv;

  const char **argv_ptr;

  char *list_option_full = NULL;

  new_argc += 12;

  new_argv = (const char **) xcalloc (sizeof (char *), new_argc);

  argv_ptr = new_argv;

  *argv_ptr++ = argv[0];

  *argv_ptr++ = "-combine";

  *argv_ptr++ = "-x";

  *argv_ptr++ = "lto";

  *argv_ptr++ = "-c";

  if (lto_mode == LTO_MODE_LTO)

    {

      flto_out = make_temp_file (".lto.o");

      *argv_ptr++ = "-o";

      *argv_ptr++ = flto_out;

    }

  else if (lto_mode == LTO_MODE_WHOPR)

    {

      const char *list_option = "-fltrans-output-list=";

      size_t list_option_len = strlen (list_option);

      char *tmp;

      ltrans_output_file = make_temp_file (".ltrans.out");

      list_option_full = (char *) xmalloc (sizeof (char) *

                         (strlen (ltrans_output_file) + list_option_len + 1));

      tmp = list_option_full;

      *argv_ptr++ = tmp;

      strcpy (tmp, list_option);

      tmp += list_option_len;

      strcpy (tmp, ltrans_output_file);

      *argv_ptr++ = "-fwpa";

    }

  else

    fatal ("invalid LTO mode");

  /* Add inherited GCC options to the LTO back end command line.

     Filter out some obviously inappropriate options that will

     conflict with  the options that we force above.  We pass

     all of the remaining options on to LTO, and let it complain

     about any it doesn't like. Note that we invoke LTO via the

     `gcc' driver, so the usual option processing takes place.

     Except for `-flto' and `-fwhopr', we should only filter options that

     are meaningful to `ld', lest an option go silently unclaimed.  */

  for (i = 1; i < argc; i++)

    {

      const char *s = argv[i];

      if (strcmp (s, "-flto") == 0 || strcmp (s, "-fwhopr") == 0)

        /* We've handled this LTO option, don't pass it on.  */

        ;

      else if (*s == '-' && s[1] == 'o')

        {

          /* Drop `-o' and its filename argument.  We will use a

             temporary file for the LTO output.  The `-o' option

             will be interpreted by the linker.  */

          if (s[2] == '\0')

            {

              char *output_dir, *base, *name;

              i++;

              output_dir = xstrdup (argv[i]);

              base = output_dir;

              for (name = base; *name; name++)

                if (IS_DIR_SEPARATOR (*name))

                  base = name + 1;

              *base = '\0';

              *argv_ptr++ = "-dumpbase";

              if (*output_dir == '\0')

                {

                  static char current_dir[] =

                    { '.', DIR_SEPARATOR, '\0' };

                  output_dir = current_dir;

                  *argv_ptr++ = argv[i];

                }

              else

                *argv_ptr++ = &argv[i][base - output_dir];

              *argv_ptr++ = "-dumpdir";

              *argv_ptr++ = output_dir;

            }

        }

      else

        /* Pass the option or argument to LTO.  */

        *argv_ptr++ = s;

    }

  *argv_ptr = NULL;

  fork_execute (CONST_CAST (char **, new_argv));

  free (new_argv);

  new_argv = NULL;

  if (lto_mode == LTO_MODE_LTO)

    {

      printf("%s\n", flto_out);

      free (flto_out);

      flto_out = NULL;

    }

  else if (lto_mode == LTO_MODE_WHOPR)

    {

      FILE *stream = fopen (ltrans_output_file, "r");

      int c;

      if (!stream)

        fatal_perror ("fopen: %s", ltrans_output_file);

      while ((c = getc (stream)) != EOF)

        putc (c, stdout);

      fclose (stream);

      maybe_unlink_file (ltrans_output_file);

      free (list_option_full);

    }

  else

    fatal ("invalid LTO mode");

}

/* Parse the command line. Copy any unused argument to GCC_ARGV. ARGC is the

   number of arguments. ARGV contains the arguments. */

static int

process_args (int argc, char *argv[], char *gcc_argv[])

{

  int i;

  int j = 0;

  for (i = 1; i < argc; i ++)

    {

      if (! strcmp (argv[i], "-debug"))

        debug = 1;

      else if (! strcmp (argv[i], "-flto"))

        lto_mode = LTO_MODE_LTO;

      else if (! strcmp (argv[i], "-fwhopr"))

        lto_mode = LTO_MODE_WHOPR;

      else

        {

          gcc_argv[j] = argv[i];

          j++;

        }

    }

  return j;

}

/* Entry point.  */

int

main (int argc, char *argv[])

{

  char **gcc_argv;

  int gcc_argc;

  gcc_init_libintl ();

  /* We may be called with all the arguments stored in some file and

     passed with @file.  Expand them into argv before processing.  */

  expandargv (&argc, &argv);

  gcc_argv = (char **) xcalloc (sizeof (char *), argc);

  gcc_argc = process_args (argc, argv, gcc_argv);

  run_gcc (gcc_argc, gcc_argv);

  free (gcc_argv);

  return 0;

}