path: root/gdb/main.c

/* Top level stuff for GDB, the GNU debugger.
   Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994
   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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include <setjmp.h>
#include "top.h"
#include "target.h"
#include "inferior.h"
#include "call-cmds.h"

#include "getopt.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>

#include <string.h>
/* R_OK lives in either unistd.h or sys/file.h.  */
#ifdef USG
#include <unistd.h>
#endif
#ifndef	NO_SYS_FILE
#include <sys/file.h>
#endif

/* Temporary variable for SET_TOP_LEVEL.  */
static int top_level_val;

/* Do a setjmp on error_return and quit_return.  catch_errors is
   generally a cleaner way to do this, but main() would look pretty
   ugly if it had to use catch_errors each time.  */

#define SET_TOP_LEVEL() \
  (((top_level_val = setjmp (error_return)) \
    ? (PTR) 0 : (PTR) memcpy (quit_return, error_return, sizeof (jmp_buf))) \
   , top_level_val)

extern void gdb_init PARAMS ((void));

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;

/* start-sanitize-mpw */
#ifdef MPW
  /* Drop into MacsBug, but only if the executable is specially named. */
  if (strcmp(argv[0], "DEBUGGDB") == 0)
    DebugStr("\pat start of GDB main");
  /* Do all Mac-specific setup. */
  mac_init ();
#endif /* MPW */
/* end-sanitize-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;

  /* 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[] =
      {
	{"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'},
/* 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 'f':
	    annotation_level = 1;
	    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;
	    }
	    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);
	  }
      }

    /* 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;
  }

  gdb_init ();

  /* 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)
    {
      /* --version is intentionally not documented here, because we
	 are printing the version here, and the help is long enough
	 already.  */

      print_gdb_version (gdb_stdout);
      /* Make sure the output gets printed.  */
      wrap_here ("");
      printf_filtered ("\n");

      /* But don't use *_filtered here.  We don't want to prompt for continue
	 no matter how small the screen or how much we're going to print.  */
/* start-sanitize-mpw */
/* For reasons too ugly to describe... */
#ifdef MPW_C
      fputs_unfiltered ("This is the GNU debugger.\n", gdb_stdout);
#else
/* end-sanitize-mpw */
      fputs_unfiltered ("\
This is the GNU debugger.  Usage:\n\
    gdb [options] [executable-file [core-file or process-id]]\n\
Options:\n\
  --help             Print this message.\n\
  --quiet            Do not print version number on startup.\n\
  --fullname         Output information used by emacs-GDB interface.\n\
  --epoch            Output information used by epoch emacs-GDB interface.\n\
  --batch            Exit after processing options.\n\
  --nx               Do not read .gdbinit file.\n\
  --tty=TTY          Use TTY for input/output by the program being debugged.\n\
  --cd=DIR           Change current directory to DIR.\n\
  --directory=DIR    Search for source files in DIR.\n\
  --command=FILE     Execute GDB commands from FILE.\n\
  --symbols=SYMFILE  Read symbols from SYMFILE.\n\
  --exec=EXECFILE    Use EXECFILE as the executable.\n\
  --se=FILE          Use FILE as symbol file and executable file.\n\
  --core=COREFILE    Analyze the core dump COREFILE.\n\
  -b BAUDRATE        Set serial port baud rate used for remote debugging.\n\
  --mapped           Use mapped symbol files if supported on this system.\n\
  --readnow          Fully read symbol files on first access.\n\
", gdb_stdout);
/* start-sanitize-mpw */
#endif /* MPW_C */
/* end-sanitize-mpw */
#ifdef ADDITIONAL_OPTION_HELP
      fputs_unfiltered (ADDITIONAL_OPTION_HELP, gdb_stdout);
#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", 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_gnu_advertisement ();
      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";
  /* 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.  */
  homedir = getenv ("HOME");
  if (homedir)
    {
      homeinit = (char *) alloca (strlen (getenv ("HOME")) +
				  strlen (gdbinit) + 10);
      strcpy (homeinit, getenv ("HOME"));
      strcat (homeinit, "/");
      strcat (homeinit, gdbinit);
      if (!inhibit_gdbinit && access (homeinit, R_OK) == 0)
	{
	  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";
  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 = 0;
  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 && access (gdbinit, R_OK) == 0)
      {
	if (!SET_TOP_LEVEL ())
	  source_command (gdbinit, 0);
      }
  do_cleanups (ALL_CLEANUPS);

  for (i = 0; i < ncmd; i++)
    {
      if (!SET_TOP_LEVEL ())
	{
	  if (cmdarg[i][0] == '-' && cmdarg[i][1] == '\0')
	    read_command_file (stdin);
	  else
	    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

  /* The command loop.  */

  while (1)
    {
      if (!SET_TOP_LEVEL ())
	{
	  do_cleanups (ALL_CLEANUPS);		/* Do complete cleanup */
/* start-sanitize-mpw */
#ifdef MPW
	  /* If we're being a Mac application, go into a Mac-specific
	     event-handling loop instead.  We still want to be inside
	     the outer loop, because that will catch longjmps resulting
	     from some command executions. */
	  if (mac_app)
	    mac_command_loop ();
	  else
#endif /* MPW */
/* end-sanitize-mpw */
	  command_loop ();
          quit_command ((char *)0, instream == stdin);
	}
    }
  /* No exit -- exit is through quit_command.  */
}

void
init_proc ()
{
}

int
proc_wait (pid, status)
     int pid;
     int *status;
{
#ifndef __GO32__
  return wait (status);
#endif
}

void
proc_remove_foreign (pid)
     int pid;
{
}

void
fputs_unfiltered (linebuffer, stream)
     const char *linebuffer;
     FILE *stream;
{
  fputs (linebuffer, stream);
}