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/* Top level stuff for GDB, the GNU debugger.

   Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,

   1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008,

   2009, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

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

#include "defs.h"

#include "top.h"

#include "target.h"

#include "inferior.h"

#include "symfile.h"

#include "gdbcore.h"

#include "exceptions.h"

#include "getopt.h"

#include <sys/types.h>

#include "gdb_stat.h"

#include <ctype.h>

#include "gdb_string.h"

#include "event-loop.h"

#include "ui-out.h"

#include "interps.h"

#include "main.h"

#include "source.h"

/* If nonzero, display time usage both at startup and for each command.  */

int display_time;

/* If nonzero, display space usage both at startup and for each command.  */

int display_space;

/* The selected interpreter.  This will be used as a set command

   variable, so it should always be malloc'ed - since

   do_setshow_command will free it. */

char *interpreter_p;

/* Whether xdb commands will be handled */

int xdb_commands = 0;

/* Whether dbx commands will be handled */

int dbx_commands = 0;

/* System root path, used to find libraries etc.  */

char *gdb_sysroot = 0;

/* GDB datadir, used to store data files.  */

char *gdb_datadir = 0;

struct ui_file *gdb_stdout;

struct ui_file *gdb_stderr;

struct ui_file *gdb_stdlog;

struct ui_file *gdb_stdin;

/* target IO streams */

struct ui_file *gdb_stdtargin;

struct ui_file *gdb_stdtarg;

struct ui_file *gdb_stdtargerr;

/* Support for the --batch-silent option.  */

int batch_silent = 0;

/* Support for --return-child-result option.

   Set the default to -1 to return error in the case

   that the program does not run or does not complete.  */

int return_child_result = 0;

int return_child_result_value = -1;

/* Whether to enable writing into executable and core files */

extern int write_files;

/* GDB as it has been invoked from the command line (i.e. argv[0]).  */

static char *gdb_program_name;

static void print_gdb_help (struct ui_file *);

/* These two are used to set the external editor commands when gdb is farming

   out files to be edited by another program. */

extern char *external_editor_command;

/* Relocate a file or directory.  PROGNAME is the name by which gdb

   was invoked (i.e., argv[0]).  INITIAL is the default value for the

   file or directory.  FLAG is true if the value is relocatable, false

   otherwise.  Returns a newly allocated string; this may return NULL

   under the same conditions as make_relative_prefix.  */

static char *

relocate_path (const char *progname, const char *initial, int flag)

{

  if (flag)

    return make_relative_prefix (progname, BINDIR, initial);

  return xstrdup (initial);

}

/* Like relocate_path, but specifically checks for a directory.

   INITIAL is relocated according to the rules of relocate_path.  If

   the result is a directory, it is used; otherwise, INITIAL is used.

   The chosen directory is then canonicalized using lrealpath.  This

   function always returns a newly-allocated string.  */

static char *

relocate_directory (const char *progname, const char *initial, int flag)

{

  char *dir;

  dir = relocate_path (progname, initial, flag);

  if (dir)

    {

      struct stat s;

      if (stat (dir, &s) != 0 || !S_ISDIR (s.st_mode))

        {

          xfree (dir);

          dir = NULL;

        }

    }

  if (!dir)

    dir = xstrdup (initial);

  /* Canonicalize the directory.  */

  if (*dir)

    {

      char *canon_sysroot = lrealpath (dir);

      if (canon_sysroot)

        {

          xfree (dir);

          dir = canon_sysroot;

        }

    }

  return dir;

}

/* Compute the locations of init files that GDB should source and return

   them in SYSTEM_GDBINIT, HOME_GDBINIT, LOCAL_GDBINIT.  If there is

   no system gdbinit (resp. home gdbinit and local gdbinit) to be loaded,

   then SYSTEM_GDBINIT (resp. HOME_GDBINIT and LOCAL_GDBINIT) is set to

   NULL.  */

static void

get_init_files (char **system_gdbinit,

                char **home_gdbinit,

                char **local_gdbinit)

{

  static char *sysgdbinit = NULL;

  static char *homeinit = NULL;

  static char *localinit = NULL;

  static int initialized = 0;

  if (!initialized)

    {

      struct stat homebuf, cwdbuf, s;

      char *homedir, *relocated_sysgdbinit;

      if (SYSTEM_GDBINIT[0])

        {

          relocated_sysgdbinit = relocate_path (gdb_program_name,

                                                SYSTEM_GDBINIT,

                                                SYSTEM_GDBINIT_RELOCATABLE);

          if (relocated_sysgdbinit && stat (relocated_sysgdbinit, &s) == 0)

            sysgdbinit = relocated_sysgdbinit;

          else

            xfree (relocated_sysgdbinit);

        }

      homedir = getenv ("HOME");

      /* If the .gdbinit file in the current directory is the same as

         the $HOME/.gdbinit file, it should not be sourced.  homebuf

         and cwdbuf are used in that purpose. Make sure that the stats

         are zero in case one of them fails (this guarantees that they

         won't match if either exists).  */

      memset (&homebuf, 0, sizeof (struct stat));

      memset (&cwdbuf, 0, sizeof (struct stat));

      if (homedir)

        {

          homeinit = xstrprintf ("%s/%s", homedir, gdbinit);

          if (stat (homeinit, &homebuf) != 0)

            {

              xfree (homeinit);

              homeinit = NULL;

            }

        }

      if (stat (gdbinit, &cwdbuf) == 0)

        {

          if (!homeinit

              || memcmp ((char *) &homebuf, (char *) &cwdbuf,

                         sizeof (struct stat)))

            localinit = gdbinit;

        }

      initialized = 1;

    }

  *system_gdbinit = sysgdbinit;

  *home_gdbinit = homeinit;

  *local_gdbinit = localinit;

}

/* Call command_loop.  If it happens to return, pass that through as a

   non-zero return status. */

static int

captured_command_loop (void *data)

{

  current_interp_command_loop ();

  /* FIXME: cagney/1999-11-05: A correct command_loop() implementaton

     would clean things up (restoring the cleanup chain) to the state

     they were just prior to the call.  Technically, this means that

     the do_cleanups() below is redundant.  Unfortunately, many FUNCs

     are not that well behaved.  do_cleanups should either be replaced

     with a do_cleanups call (to cover the problem) or an assertion

     check to detect bad FUNCs code. */

  do_cleanups (ALL_CLEANUPS);

  /* If the command_loop returned, normally (rather than threw an

     error) we try to quit. If the quit is aborted, catch_errors()

     which called this catch the signal and restart the command

     loop. */

  quit_command (NULL, instream == stdin);

  return 1;

}

static int

captured_main (void *data)

{

  struct captured_main_args *context = data;

  int argc = context->argc;

  char **argv = context->argv;

  static int quiet = 0;

  static int batch = 0;

  static int set_args = 0;

  /* Pointers to various arguments from command line.  */

  char *symarg = NULL;

  char *execarg = NULL;

  char *pidarg = NULL;

  char *corearg = NULL;

  char *pid_or_core_arg = NULL;

  char *cdarg = NULL;

  char *ttyarg = NULL;

  /* These are static so that we can take their address in an initializer.  */

  static int print_help;

  static int print_version;

  /* Pointers to all arguments of --command option.  */

  struct cmdarg {

    enum {

      CMDARG_FILE,

      CMDARG_COMMAND

    } type;

    char *string;

  } *cmdarg;

  /* Allocated size of cmdarg.  */

  int cmdsize;

  /* Number of elements of cmdarg used.  */

  int ncmd;

  /* Indices of all arguments of --directory option.  */

  char **dirarg;

  /* Allocated size.  */

  int dirsize;

  /* Number of elements used.  */

  int ndir;

  /* gdb init files.  */

  char *system_gdbinit;

  char *home_gdbinit;

  char *local_gdbinit;

  int i;

  long time_at_startup = get_run_time ();

#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);

#ifdef HAVE_SBRK

  lim_at_start = (char *) sbrk (0);

#endif

  cmdsize = 1;

  cmdarg = (struct cmdarg *) xmalloc (cmdsize * sizeof (*cmdarg));

  ncmd = 0;

  dirsize = 1;

  dirarg = (char **) xmalloc (dirsize * sizeof (*dirarg));

  ndir = 0;

  quit_flag = 0;

  line = (char *) xmalloc (linesize);

  line[0] = '\0';                /* Terminate saved (now empty) cmd line */

  instream = stdin;

  gdb_stdout = stdio_fileopen (stdout);

  gdb_stderr = stdio_fileopen (stderr);

  gdb_stdlog = gdb_stderr;      /* for moment */

  gdb_stdtarg = gdb_stderr;     /* for moment */

  gdb_stdin = stdio_fileopen (stdin);

  gdb_stdtargerr = gdb_stderr;  /* for moment */

  gdb_stdtargin = gdb_stdin;    /* for moment */

  gdb_program_name = xstrdup (argv[0]);

  if (! getcwd (gdb_dirbuf, sizeof (gdb_dirbuf)))

    /* Don't use *_filtered or warning() (which relies on

       current_target) until after initialize_all_files(). */

    fprintf_unfiltered (gdb_stderr,

                        _("%s: warning: error finding working directory: %s\n"),

                        argv[0], safe_strerror (errno));

  current_directory = gdb_dirbuf;

  /* Set the sysroot path.  */

  gdb_sysroot = relocate_directory (argv[0], TARGET_SYSTEM_ROOT,

                                    TARGET_SYSTEM_ROOT_RELOCATABLE);

  debug_file_directory = relocate_directory (argv[0], DEBUGDIR,

                                             DEBUGDIR_RELOCATABLE);

  gdb_datadir = relocate_directory (argv[0], GDB_DATADIR,

                                    GDB_DATADIR_RELOCATABLE);

#ifdef RELOC_SRCDIR

  add_substitute_path_rule (RELOC_SRCDIR,

                            make_relative_prefix (argv[0], BINDIR,

                                                  RELOC_SRCDIR));

#endif

  /* There will always be an interpreter.  Either the one passed into

     this captured main, or one specified by the user at start up, or

     the console.  Initialize the interpreter to the one requested by

     the application.  */

  interpreter_p = xstrdup (context->interpreter_p);

  /* Parse arguments and options.  */

  {

    int c;

    /* When var field is 0, use flag field to record the equivalent

       short option (or arbitrary numbers starting at 10 for those

       with no equivalent).  */

    enum {

      OPT_SE = 10,

      OPT_CD,

      OPT_ANNOTATE,

      OPT_STATISTICS,

      OPT_TUI,

      OPT_NOWINDOWS,

      OPT_WINDOWS

    };

    static struct option long_options[] =

    {

      {"tui", no_argument, 0, OPT_TUI},

      {"xdb", no_argument, &xdb_commands, 1},

      {"dbx", no_argument, &dbx_commands, 1},

      {"readnow", no_argument, &readnow_symbol_files, 1},

      {"r", no_argument, &readnow_symbol_files, 1},

      {"quiet", no_argument, &quiet, 1},

      {"q", no_argument, &quiet, 1},

      {"silent", no_argument, &quiet, 1},

      {"nx", no_argument, &inhibit_gdbinit, 1},

      {"n", no_argument, &inhibit_gdbinit, 1},

      {"batch-silent", no_argument, 0, 'B'},

      {"batch", no_argument, &batch, 1},

      {"epoch", no_argument, &epoch_interface, 1},

    /* This is a synonym for "--annotate=1".  --annotate is now preferred,

       but keep this here for a long time because people will be running

       emacses which use --fullname.  */

      {"fullname", no_argument, 0, 'f'},

      {"f", no_argument, 0, 'f'},

      {"annotate", required_argument, 0, OPT_ANNOTATE},

      {"help", no_argument, &print_help, 1},

      {"se", required_argument, 0, OPT_SE},

      {"symbols", required_argument, 0, 's'},

      {"s", required_argument, 0, 's'},

      {"exec", required_argument, 0, 'e'},

      {"e", required_argument, 0, 'e'},

      {"core", required_argument, 0, 'c'},

      {"c", required_argument, 0, 'c'},

      {"pid", required_argument, 0, 'p'},

      {"p", required_argument, 0, 'p'},

      {"command", required_argument, 0, 'x'},

      {"eval-command", required_argument, 0, 'X'},

      {"version", no_argument, &print_version, 1},

      {"x", required_argument, 0, 'x'},

      {"ex", required_argument, 0, 'X'},

#ifdef GDBTK

      {"tclcommand", required_argument, 0, 'z'},

      {"enable-external-editor", no_argument, 0, 'y'},

      {"editor-command", required_argument, 0, 'w'},

#endif

      {"ui", required_argument, 0, 'i'},

      {"interpreter", required_argument, 0, 'i'},

      {"i", required_argument, 0, 'i'},

      {"directory", required_argument, 0, 'd'},

      {"d", required_argument, 0, 'd'},

      {"cd", required_argument, 0, OPT_CD},

      {"tty", required_argument, 0, 't'},

      {"baud", required_argument, 0, 'b'},

      {"b", required_argument, 0, 'b'},

      {"nw", no_argument, NULL, OPT_NOWINDOWS},

      {"nowindows", no_argument, NULL, OPT_NOWINDOWS},

      {"w", no_argument, NULL, OPT_WINDOWS},

      {"windows", no_argument, NULL, OPT_WINDOWS},

      {"statistics", no_argument, 0, OPT_STATISTICS},

      {"write", no_argument, &write_files, 1},

      {"args", no_argument, &set_args, 1},

      {"l", required_argument, 0, 'l'},

      {"return-child-result", no_argument, &return_child_result, 1},

      {0, no_argument, 0, 0}

    };

    while (1)

      {

        int option_index;

        c = getopt_long_only (argc, argv, "",

                              long_options, &option_index);

        if (c == EOF || set_args)

          break;

        /* Long option that takes an argument.  */

        if (c == 0 && long_options[option_index].flag == 0)

          c = long_options[option_index].val;

        switch (c)

          {

          case 0:

            /* Long option that just sets a flag.  */

            break;

          case OPT_SE:

            symarg = optarg;

            execarg = optarg;

            break;

          case OPT_CD:

            cdarg = optarg;

            break;

          case OPT_ANNOTATE:

            /* FIXME: what if the syntax is wrong (e.g. not digits)?  */

            annotation_level = atoi (optarg);

            break;

          case OPT_STATISTICS:

            /* Enable the display of both time and space usage.  */

            display_time = 1;

            display_space = 1;

            break;

          case OPT_TUI:

            /* --tui is equivalent to -i=tui.  */

#ifdef TUI

            xfree (interpreter_p);

            interpreter_p = xstrdup (INTERP_TUI);

#else

            fprintf_unfiltered (gdb_stderr,

                                _("%s: TUI mode is not supported\n"),

                                argv[0]);

            exit (1);

#endif

            break;

          case OPT_WINDOWS:

            /* FIXME: cagney/2003-03-01: Not sure if this option is

               actually useful, and if it is, what it should do.  */

#ifdef GDBTK

            /* --windows is equivalent to -i=insight.  */

            xfree (interpreter_p);

            interpreter_p = xstrdup (INTERP_INSIGHT);

#endif

            use_windows = 1;

            break;

          case OPT_NOWINDOWS:

            /* -nw is equivalent to -i=console.  */

            xfree (interpreter_p);

            interpreter_p = xstrdup (INTERP_CONSOLE);

            use_windows = 0;

            break;

          case 'f':

            annotation_level = 1;

/* We have probably been invoked from emacs.  Disable window interface.  */

            use_windows = 0;

            break;

          case 's':

            symarg = optarg;

            break;

          case 'e':

            execarg = optarg;

            break;

          case 'c':

            corearg = optarg;

            break;

          case 'p':

            pidarg = optarg;

            break;

          case 'x':

            cmdarg[ncmd].type = CMDARG_FILE;

            cmdarg[ncmd++].string = optarg;

            if (ncmd >= cmdsize)

              {

                cmdsize *= 2;

                cmdarg = xrealloc ((char *) cmdarg,

                                   cmdsize * sizeof (*cmdarg));

              }

            break;

          case 'X':

            cmdarg[ncmd].type = CMDARG_COMMAND;

            cmdarg[ncmd++].string = optarg;

            if (ncmd >= cmdsize)

              {

                cmdsize *= 2;

                cmdarg = xrealloc ((char *) cmdarg,

                                   cmdsize * sizeof (*cmdarg));

              }

            break;

          case 'B':

            batch = batch_silent = 1;

            gdb_stdout = ui_file_new();

            break;

#ifdef GDBTK

          case 'z':

            {

extern int gdbtk_test (char *);

              if (!gdbtk_test (optarg))

                {

                  fprintf_unfiltered (gdb_stderr, _("%s: unable to load tclcommand file \"%s\""),

                                      argv[0], optarg);

                  exit (1);

                }

              break;

            }

          case 'y':

            /* Backwards compatibility only.  */

            break;

          case 'w':

            {

              external_editor_command = xstrdup (optarg);

              break;

            }

#endif /* GDBTK */

          case 'i':

            xfree (interpreter_p);

            interpreter_p = xstrdup (optarg);

            break;

          case 'd':

            dirarg[ndir++] = optarg;

            if (ndir >= dirsize)

              {

                dirsize *= 2;

                dirarg = (char **) xrealloc ((char *) dirarg,

                                             dirsize * sizeof (*dirarg));

              }

            break;

          case 't':

            ttyarg = optarg;

            break;

          case 'q':

            quiet = 1;

            break;

          case 'b':

            {

              int i;

              char *p;

              i = strtol (optarg, &p, 0);

              if (i == 0 && p == optarg)

                /* Don't use *_filtered or warning() (which relies on

                   current_target) until after initialize_all_files(). */

                fprintf_unfiltered

                  (gdb_stderr,

                   _("warning: could not set baud rate to `%s'.\n"), optarg);

              else

                baud_rate = i;

            }

            break;

          case 'l':

            {

              int i;

              char *p;

              i = strtol (optarg, &p, 0);

              if (i == 0 && p == optarg)

                /* Don't use *_filtered or warning() (which relies on

                   current_target) until after initialize_all_files(). */

                fprintf_unfiltered

                  (gdb_stderr,

                 _("warning: could not set timeout limit to `%s'.\n"), optarg);

              else

                remote_timeout = i;

            }

            break;

          case '?':

            fprintf_unfiltered (gdb_stderr,

                        _("Use `%s --help' for a complete list of options.\n"),

                                argv[0]);

            exit (1);

          }

      }

    /* If --help or --version, disable window interface.  */

    if (print_help || print_version)

      {

        use_windows = 0;

      }

    if (batch)

      quiet = 1;

  }

  /* Initialize all files.  Give the interpreter a chance to take

     control of the console via the deprecated_init_ui_hook ().  */

  gdb_init (argv[0]);

  /* Now that gdb_init has created the initial inferior, we're in position

     to set args for that inferior.  */

  if (set_args)

    {

      /* The remaining options are the command-line options for the

         inferior.  The first one is the sym/exec file, and the rest

         are arguments.  */

      if (optind >= argc)

        {

          fprintf_unfiltered (gdb_stderr,

                              _("%s: `--args' specified but no program specified\n"),

                              argv[0]);

          exit (1);

        }

      symarg = argv[optind];

      execarg = argv[optind];

      ++optind;

      set_inferior_args_vector (argc - optind, &argv[optind]);

    }

  else

    {

      /* OK, that's all the options.  */

      /* The first argument, if specified, is the name of the

         executable.  */

      if (optind < argc)

        {

          symarg = argv[optind];

          execarg = argv[optind];

          optind++;

        }

      /* If the user hasn't already specified a PID or the name of a