* readelf.c (process_relocs): Determine type of reloc from

[deliverable/binutils-gdb.git] / gdb / main.c

/* Top level stuff for GDB, the GNU debugger.
   Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995
   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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "top.h"
#include "event-loop.h"
#include "target.h"
#include "inferior.h"
#include "call-cmds.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "getopt.h"

#include <sys/types.h>
#include "gdb_stat.h"
#include <ctype.h>

#include "gdb_string.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;

/* Whether this is the async version or not.  The async version is
invoked on the command line with the -nw --async options.  In this
version, the usual command_loop is substituted by and event loop which
processes UI events asynchronously. */
int async = 0;

/* Whether this is the command line version or not */
int tui_version = 0;

/* Whether xdb commands will be handled */
int xdb_commands = 0;

/* Whether dbx commands will be handled */
int dbx_commands = 0;

GDB_FILE *gdb_stdout;
GDB_FILE *gdb_stderr;

/* Whether to enable writing into executable and core files */
extern int write_files;

static void print_gdb_help PARAMS ((GDB_FILE *));

/* These two are used to set the external editor commands when gdb is farming
   out files to be edited by another program. */

extern int enable_external_editor;
extern char * external_editor_command;

#ifdef __CYGWIN__
#include <windows.h> /* for MAX_PATH */
#include <sys/cygwin.h> /* for cygwin32_conv_to_posix_path */
#endif

int
main (argc, argv)
     int argc;
     char **argv;
{
  int count;
  static int quiet = 0;
  static int batch = 0;

  /* Pointers to various arguments from command line.  */
  char *symarg = NULL;
  char *execarg = NULL;
  char *corearg = 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.  */
  char **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;
  
  struct stat homebuf, cwdbuf;
  char *homedir, *homeinit;

  register int i;

  long time_at_startup = get_run_time ();

  int gdb_file_size;

  START_PROGRESS (argv[0], 0);

#ifdef MPW
  /* Do all Mac-specific setup. */
  mac_init ();
#endif /* MPW */

  /* This needs to happen before the first use of malloc.  */
  init_malloc ((PTR) NULL);

#if defined (ALIGN_STACK_ON_STARTUP)
  i = (int) &count & 0x3;
  if (i != 0)
    alloca (4 - i);
#endif

  /* If error() is called from initialization code, just exit */
  if (SET_TOP_LEVEL ()) {
    exit(1);
  }

  cmdsize = 1;
  cmdarg = (char **) 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;

  getcwd (gdb_dirbuf, sizeof (gdb_dirbuf));
  current_directory = gdb_dirbuf;

  gdb_file_size = sizeof(GDB_FILE);

  gdb_stdout = (GDB_FILE *)xmalloc (gdb_file_size);
  gdb_stdout->ts_streamtype = afile;
  gdb_stdout->ts_filestream = stdout;
  gdb_stdout->ts_strbuf = NULL;
  gdb_stdout->ts_buflen = 0;

  gdb_stderr = (GDB_FILE *)xmalloc (gdb_file_size);
  gdb_stderr->ts_streamtype = afile;
  gdb_stderr->ts_filestream = stderr;
  gdb_stderr->ts_strbuf = NULL;
  gdb_stderr->ts_buflen = 0;

  /* 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).  */
    static struct option long_options[] =
       {
        {"async", no_argument, &async, 1},  
#if defined(TUI)
	{"tui", no_argument, &tui_version, 1},
#endif
	{"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},
	{"mapped", no_argument, &mapped_symbol_files, 1},
	{"m", no_argument, &mapped_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", 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, 12},
	{"help", no_argument, &print_help, 1},
	{"se", required_argument, 0, 10},
	{"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'},
	{"command", required_argument, 0, 'x'},
	{"version", no_argument, &print_version, 1},
	{"x", required_argument, 0, 'x'},
	{"directory", required_argument, 0, 'd'},
	{"cd", required_argument, 0, 11},
	{"tty", required_argument, 0, 't'},
	{"baud", required_argument, 0, 'b'},
	{"b", required_argument, 0, 'b'},
	{"nw", no_argument, &use_windows, 0},
	{"nowindows", no_argument, &use_windows, 0},
	{"w", no_argument, &use_windows, 1},
	{"windows", no_argument, &use_windows, 1},
	{"statistics", no_argument, 0, 13},
	{"write", no_argument, &write_files, 1},
/* Allow machine descriptions to add more options... */
#ifdef ADDITIONAL_OPTIONS
	ADDITIONAL_OPTIONS
#endif
	{0, no_argument, 0, 0}
      };

    while (1)
      {
	int option_index;

	c = getopt_long_only (argc, argv, "",
			      long_options, &option_index);
	if (c == EOF)
	  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 10:
	    symarg = optarg;
	    execarg = optarg;
	    break;
	  case 11:
	    cdarg = optarg;
	    break;
	  case 12:
	    /* FIXME: what if the syntax is wrong (e.g. not digits)?  */
	    annotation_level = atoi (optarg);
	    break;
	  case 13:
	    /* Enable the display of both time and space usage.  */
	    display_time = 1;
	    display_space = 1;
	    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 'x':
	    cmdarg[ncmd++] = optarg;
	    if (ncmd >= cmdsize)
	      {
		cmdsize *= 2;
		cmdarg = (char **) xrealloc ((char *)cmdarg,
					     cmdsize * sizeof (*cmdarg));
	      }
	    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;
	    }
	  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;

#ifdef ADDITIONAL_OPTION_CASES
	  ADDITIONAL_OPTION_CASES
#endif
	  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;
#ifdef TUI
	/* Disable the TUI as well.  */
	tui_version = 0;
#endif
      }

#ifdef TUI
    /* An explicit --tui flag overrides the default UI, which is the
       window system.  */
    if (tui_version)
      use_windows = 0;
#endif      

    /* OK, that's all the options.  The other arguments are filenames.  */
    count = 0;
    for (; optind < argc; optind++)
      switch (++count)
	{
	case 1:
	  symarg = argv[optind];
	  execarg = argv[optind];
	  break;
	case 2:
	  corearg = argv[optind];
	  break;
	case 3:
	  fprintf_unfiltered (gdb_stderr,
		   "Excess command line arguments ignored. (%s%s)\n",
		   argv[optind], (optind == argc - 1) ? "" : " ...");
	  break;
	}
    if (batch)
      quiet = 1;
  }

  /* Get ready to invoke the event loop instead of the
     command_loop. See event-loop.h for more details.*/
  if (async)
    async_hook = setup_event_loop;
#if defined(TUI)
  if (tui_version)
    init_ui_hook = tuiInit;
#endif
  gdb_init (argv[0]);

  /* Do these (and anything which might call wrap_here or *_filtered)
     after initialize_all_files.  */
  if (print_version)
    {
      print_gdb_version (gdb_stdout);
      wrap_here ("");
      printf_filtered ("\n");
      exit (0);
    }

  if (print_help)
    {
      print_gdb_help (gdb_stdout);
      fputs_unfiltered ("\n", gdb_stdout);
      exit (0);
    }

  if (!quiet)
    {
      /* Print all the junk at the top, with trailing "..." if we are about
	 to read a symbol file (possibly slowly).  */
      print_gdb_version (gdb_stdout);
      if (symarg)
	printf_filtered ("..");
      wrap_here("");
      gdb_flush (gdb_stdout);		/* Force to screen during slow operations */
    }

  error_pre_print = "\n\n";
  quit_pre_print = error_pre_print;

  /* We may get more than one warning, don't double space all of them... */
  warning_pre_print = "\nwarning: ";

  /* Read and execute $HOME/.gdbinit file, if it exists.  This is done
     *before* all the command line arguments are processed; it sets
     global parameters, which are independent of what file you are
     debugging or what directory you are in.  */
#ifdef __CYGWIN32__
  {
    char * tmp = getenv ("HOME");
    
    if (tmp != NULL)
      {
        homedir = (char *) alloca (MAX_PATH+1);
        cygwin32_conv_to_posix_path (tmp, homedir);
      }
    else
      homedir = NULL;
  }
#else
  homedir = getenv ("HOME");  
#endif
  if (homedir)
    {
      homeinit = (char *) alloca (strlen (homedir) +
				  strlen (gdbinit) + 10);
      strcpy (homeinit, homedir);
      strcat (homeinit, "/");
      strcat (homeinit, gdbinit);

      if (!inhibit_gdbinit)
	{
	  if (!SET_TOP_LEVEL ())
	    source_command (homeinit, 0);
	}
      do_cleanups (ALL_CLEANUPS);

      /* Do stats; no need to do them elsewhere since we'll only
	 need them if homedir is set.  Make sure that they 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));
      
      stat (homeinit, &homebuf);
      stat (gdbinit, &cwdbuf); /* We'll only need this if
				       homedir was set.  */
    }

  /* Now perform all the actions indicated by the arguments.  */
  if (cdarg != NULL)
    {
      if (!SET_TOP_LEVEL ())
	{
	  cd_command (cdarg, 0);
	}
    }
  do_cleanups (ALL_CLEANUPS);

  for (i = 0; i < ndir; i++)
    if (!SET_TOP_LEVEL ())
      directory_command (dirarg[i], 0);
  free ((PTR)dirarg);
  do_cleanups (ALL_CLEANUPS);

  if (execarg != NULL
      && symarg != NULL
      && STREQ (execarg, symarg))
    {
      /* The exec file and the symbol-file are the same.  If we can't open
	 it, better only print one error message.  */
      if (!SET_TOP_LEVEL ())
	{
	  exec_file_command (execarg, !batch);
	  symbol_file_command (symarg, 0);
	}
    }
  else
    {
      if (execarg != NULL)
	if (!SET_TOP_LEVEL ())
	  exec_file_command (execarg, !batch);
      if (symarg != NULL)
	if (!SET_TOP_LEVEL ())
	  symbol_file_command (symarg, 0);
    }
  do_cleanups (ALL_CLEANUPS);

  /* After the symbol file has been read, print a newline to get us
     beyond the copyright line...  But errors should still set off
     the error message with a (single) blank line.  */
  if (!quiet)
    printf_filtered ("\n");
  error_pre_print = "\n";
  quit_pre_print = error_pre_print;
  warning_pre_print = "\nwarning: ";

  if (corearg != NULL)
    {
      if (!SET_TOP_LEVEL ())
	core_file_command (corearg, !batch);
      else if (isdigit (corearg[0]) && !SET_TOP_LEVEL ())
	attach_command (corearg, !batch);
    }
  do_cleanups (ALL_CLEANUPS);

  if (ttyarg != NULL)
    if (!SET_TOP_LEVEL ())
      tty_command (ttyarg, !batch);
  do_cleanups (ALL_CLEANUPS);

#ifdef ADDITIONAL_OPTION_HANDLER
  ADDITIONAL_OPTION_HANDLER;
#endif

  /* Error messages should no longer be distinguished with extra output. */
  error_pre_print = NULL;
  quit_pre_print = NULL;
  warning_pre_print = "warning: ";

  /* Read the .gdbinit file in the current directory, *if* it isn't
     the same as the $HOME/.gdbinit file (it should exist, also).  */
  
  if (!homedir
      || memcmp ((char *) &homebuf, (char *) &cwdbuf, sizeof (struct stat)))
    if (!inhibit_gdbinit)
      {
	if (!SET_TOP_LEVEL ())
	  source_command (gdbinit, 0);
      }
  do_cleanups (ALL_CLEANUPS);

  for (i = 0; i < ncmd; i++)
    {
      if (!SET_TOP_LEVEL ())
	{
	  /* NOTE: I am commenting this out, because it is not clear
	     where this feature is used. It is very old and
	     undocumented. ezannoni: 1999-05-04*/
#if 0
	  if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0')
	    read_command_file (stdin);
	  else
#endif
	    source_command (cmdarg[i], !batch);
	  do_cleanups (ALL_CLEANUPS);
	}
    }
  free ((PTR)cmdarg);

  /* Read in the old history after all the command files have been read. */
  init_history();

  if (batch)
    {
      /* We have hit the end of the batch file.  */
      exit (0);
    }

  /* Do any host- or target-specific hacks.  This is used for i960 targets
     to force the user to set a nindy target and spec its parameters.  */

#ifdef BEFORE_MAIN_LOOP_HOOK
  BEFORE_MAIN_LOOP_HOOK;
#endif

  END_PROGRESS (argv[0]);

  /* Show time and/or space usage.  */

  if (display_time)
    {
      long init_time = get_run_time () - time_at_startup;

      printf_unfiltered ("Startup time: %ld.%06ld\n",
			 init_time / 1000000, init_time % 1000000);
    }

  if (display_space)
    {
#ifdef HAVE_SBRK
      extern char **environ;
      char *lim = (char *) sbrk (0);

      printf_unfiltered ("Startup size: data size %ld\n",
			 (long) (lim - (char *) &environ));
#endif
    }

  /* Call the event loop, if gdb was invoked with the --async
     option. Control will never get back to this file, if the event
     loop is invoked. See the files event-*.[ch] for details. */
  if (async_hook)
    async_hook();
                
  /* The default command loop. 
     The WIN32 Gui calls this main to set up gdb's state, and 
     has its own command loop. */
#if !defined _WIN32 || defined __GNUC__
  while (1)
    {
      if (!SET_TOP_LEVEL ())
	{
	  do_cleanups (ALL_CLEANUPS);		/* Do complete cleanup */
	  /* GUIs generally have their own command loop, mainloop, or whatever.
	     This is a good place to gain control because many error
	     conditions will end up here via longjmp(). */
	  if (command_loop_hook)
	    command_loop_hook ();
	  else
	    command_loop ();
          quit_command ((char *)0, instream == stdin);
	}
    }

  /* No exit -- exit is through quit_command.  */
#endif

}

/* Don't use *_filtered for printing help.  We don't want to prompt
   for continue no matter how small the screen or how much we're going
   to print.  */

static void
print_gdb_help (stream)
  GDB_FILE *stream;
{
      fputs_unfiltered ("\
This is the GNU debugger.  Usage:\n\n\
    gdb [options] [executable-file [core-file or process-id]]\n\n\
Options:\n\n\
", stream);
      fputs_unfiltered ("\
  -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
  --batch            Exit after processing options.\n\
  --cd=DIR           Change current directory to DIR.\n\
  --command=FILE     Execute GDB commands from FILE.\n\
  --core=COREFILE    Analyze the core dump COREFILE.\n\
", stream);
      fputs_unfiltered ("\
  --dbx              DBX compatibility mode.\n\
  --directory=DIR    Search for source files in DIR.\n\
  --epoch            Output information used by epoch emacs-GDB interface.\n\
  --exec=EXECFILE    Use EXECFILE as the executable.\n\
  --fullname         Output information used by emacs-GDB interface.\n\
  --help             Print this message.\n\
", stream);
      fputs_unfiltered ("\
  --mapped           Use mapped symbol files if supported on this system.\n\
  --nw		     Do not use a window interface.\n\
  --nx               Do not read .gdbinit file.\n\
  --quiet            Do not print version number on startup.\n\
  --readnow          Fully read symbol files on first access.\n\
", stream);
      fputs_unfiltered ("\
  --se=FILE          Use FILE as symbol file and executable file.\n\
  --symbols=SYMFILE  Read symbols from SYMFILE.\n\
  --tty=TTY          Use TTY for input/output by the program being debugged.\n\
", stream);
#if defined(TUI)
      fputs_unfiltered ("\
  --tui              Use a terminal user interface.\n\
", stream);
#endif
      fputs_unfiltered ("\
  --version          Print version information and then exit.\n\
  -w                 Use a window interface.\n\
  --write            Set writing into executable and core files.\n\
  --xdb              XDB compatibility mode.\n\
", stream);
#ifdef ADDITIONAL_OPTION_HELP
      fputs_unfiltered (ADDITIONAL_OPTION_HELP, stream);
#endif
      fputs_unfiltered ("\n\
For more information, type \"help\" from within GDB, or consult the\n\
GDB manual (available as on-line info or a printed manual).\n\
Report bugs to \"bug-gdb@prep.ai.mit.edu\".\
", stream);
}

\f
/* All I/O sent to the *_filtered and *_unfiltered functions eventually ends up
   here.  The fputs_unfiltered_hook is primarily used by GUIs to collect all
   output and send it to the GUI, instead of the controlling terminal.  Only
   output to gdb_stdout and gdb_stderr are sent to the hook.  Everything else
   is sent on to fputs to allow file I/O to be handled appropriately.  */

void
fputs_unfiltered (linebuffer, stream)
     const char *linebuffer;
     GDB_FILE *stream;
{
#if defined(TUI)
  extern int tui_owns_terminal;
#endif
  /* If anything (GUI, TUI) wants to capture GDB output, this is
   * the place... the way to do it is to set up 
   * fputs_unfiltered_hook.
   * Our TUI ("gdb -tui") used to hook output, but in the
   * new (XDB style) scheme, we do not do that anymore... - RT
   */
  if (fputs_unfiltered_hook
      && (stream == gdb_stdout
	  || stream == gdb_stderr))
    fputs_unfiltered_hook (linebuffer, stream);
  else
    {
#if defined(TUI)
      if (tui_version && tui_owns_terminal) {
	/* If we get here somehow while updating the TUI (from
	 * within a tuiDo(), then we need to temporarily 
	 * set up the terminal for GDB output. This probably just
	 * happens on error output.
	 */

        if (stream->ts_streamtype == astring) {
           gdb_file_adjust_strbuf(strlen(linebuffer), stream);
           strcat(stream->ts_strbuf, linebuffer);
        } else {
           tuiTermUnsetup(0, (tui_version) ? cmdWin->detail.commandInfo.curch : 0);
           fputs (linebuffer, stream->ts_filestream);
           tuiTermSetup(0);
           if (linebuffer[strlen(linebuffer) - 1] == '\n')
              tuiClearCommandCharCount();
           else
              tuiIncrCommandCharCountBy(strlen(linebuffer));
        }
      } else {
        /* The normal case - just do a fputs() */
        if (stream->ts_streamtype == astring) {
           gdb_file_adjust_strbuf(strlen(linebuffer), stream);
           strcat(stream->ts_strbuf, linebuffer);
        } else fputs (linebuffer, stream->ts_filestream);
      }
 

#else
      if (stream->ts_streamtype == astring) {
           gdb_file_adjust_strbuf(strlen(linebuffer), stream);
           strcat(stream->ts_strbuf, linebuffer);
        } else fputs (linebuffer, stream->ts_filestream);
#endif
    }
}