gdb/mi/mi-cmd-break.c

/* MI Command Set - breakpoint and watchpoint commands.
   Copyright (C) 2000, 2001, 2002, 2007, 2008, 2009, 2010, 2011
   Free Software Foundation, Inc.
   Contributed by Cygnus Solutions (a Red Hat company).

   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 "arch-utils.h"
#include "mi-cmds.h"
#include "ui-out.h"
#include "mi-out.h"
#include "breakpoint.h"
#include "gdb_string.h"
#include "mi-getopt.h"
#include "gdb.h"
#include "exceptions.h"
#include "observer.h"
#include "mi-main.h"

enum
  {
    FROM_TTY = 0
  };

/* True if MI breakpoint observers have been registered.  */

static int mi_breakpoint_observers_installed;

/* Control whether breakpoint_notify may act.  */

static int mi_can_breakpoint_notify;

/* Output a single breakpoint, when allowed. */

static void
breakpoint_notify (struct breakpoint *b)
{
  if (mi_can_breakpoint_notify)
    gdb_breakpoint_query (current_uiout, b->number, NULL);
}

enum bp_type
  {
    REG_BP,
    HW_BP,
    REGEXP_BP
  };

/* Implements the -break-insert command.
   See the MI manual for the list of possible options.  */

void
mi_cmd_break_insert (char *command, char **argv, int argc)
{
  char *address = NULL;
  int hardware = 0;
  int temp_p = 0;
  int thread = -1;
  int ignore_count = 0;
  char *condition = NULL;
  int pending = 0;
  int enabled = 1;
  int tracepoint = 0;
  struct cleanup *back_to;
  enum bptype type_wanted;

  enum opt
    {
      HARDWARE_OPT, TEMP_OPT, CONDITION_OPT,
      IGNORE_COUNT_OPT, THREAD_OPT, PENDING_OPT, DISABLE_OPT,
      TRACEPOINT_OPT,
    };
  static const struct mi_opt opts[] =
  {
    {"h", HARDWARE_OPT, 0},
    {"t", TEMP_OPT, 0},
    {"c", CONDITION_OPT, 1},
    {"i", IGNORE_COUNT_OPT, 1},
    {"p", THREAD_OPT, 1},
    {"f", PENDING_OPT, 0},
    {"d", DISABLE_OPT, 0},
    {"a", TRACEPOINT_OPT, 0},
    { 0, 0, 0 }
  };

  /* Parse arguments. It could be -r or -h or -t, <location> or ``--''
     to denote the end of the option list. */
  int optind = 0;
  char *optarg;

  while (1)
    {
      int opt = mi_getopt ("-break-insert", argc, argv,
			   opts, &optind, &optarg);
      if (opt < 0)
	break;
      switch ((enum opt) opt)
	{
	case TEMP_OPT:
	  temp_p = 1;
	  break;
	case HARDWARE_OPT:
	  hardware = 1;
	  break;
	case CONDITION_OPT:
	  condition = optarg;
	  break;
	case IGNORE_COUNT_OPT:
	  ignore_count = atol (optarg);
	  break;
	case THREAD_OPT:
	  thread = atol (optarg);
	  break;
	case PENDING_OPT:
	  pending = 1;
	  break;
	case DISABLE_OPT:
	  enabled = 0;
	  break;
	case TRACEPOINT_OPT:
	  tracepoint = 1;
	  break;
	}
    }

  if (optind >= argc)
    error (_("-break-insert: Missing <location>"));
  if (optind < argc - 1)
    error (_("-break-insert: Garbage following <location>"));
  address = argv[optind];

  /* Now we have what we need, let's insert the breakpoint! */
  if (! mi_breakpoint_observers_installed)
    {
      observer_attach_breakpoint_created (breakpoint_notify);
      mi_breakpoint_observers_installed = 1;
    }

  back_to = make_cleanup_restore_integer (&mi_can_breakpoint_notify);
  mi_can_breakpoint_notify = 1;

  /* Note that to request a fast tracepoint, the client uses the
     "hardware" flag, although there's nothing of hardware related to
     fast tracepoints -- one can implement slow tracepoints with
     hardware breakpoints, but fast tracepoints are always software.
     "fast" is a misnomer, actually, "jump" would be more appropriate.
     A simulator or an emulator could conceivably implement fast
     regular non-jump based tracepoints.  */
  type_wanted = (tracepoint
		 ? (hardware ? bp_fast_tracepoint : bp_tracepoint)
		 : (hardware ? bp_hardware_breakpoint : bp_breakpoint));

  create_breakpoint (get_current_arch (), address, condition, thread,
		     0 /* condition and thread are valid.  */,
		     temp_p, type_wanted,
		     ignore_count,
		     pending ? AUTO_BOOLEAN_TRUE : AUTO_BOOLEAN_FALSE,
		     &bkpt_breakpoint_ops, 0, enabled, 0);
  do_cleanups (back_to);

}

enum wp_type
{
  REG_WP,
  READ_WP,
  ACCESS_WP
};

void
mi_cmd_break_passcount (char *command, char **argv, int argc)
{
  int n;
  int p;
  struct tracepoint *t;

  if (argc != 2)
    error (_("Usage: tracepoint-number passcount"));

  n = atoi (argv[0]);
  p = atoi (argv[1]);
  t = get_tracepoint (n);

  if (t)
    {
      t->pass_count = p;
      observer_notify_tracepoint_modified (n);
    }
  else
    {
      error (_("Could not find tracepoint %d"), n);
    }
}

/* Insert a watchpoint. The type of watchpoint is specified by the
   first argument: 
   -break-watch <expr> --> insert a regular wp.  
   -break-watch -r <expr> --> insert a read watchpoint.
   -break-watch -a <expr> --> insert an access wp. */

void
mi_cmd_break_watch (char *command, char **argv, int argc)
{
  char *expr = NULL;
  enum wp_type type = REG_WP;
  enum opt
    {
      READ_OPT, ACCESS_OPT
    };
  static const struct mi_opt opts[] =
  {
    {"r", READ_OPT, 0},
    {"a", ACCESS_OPT, 0},
    { 0, 0, 0 }
  };

  /* Parse arguments. */
  int optind = 0;
  char *optarg;

  while (1)
    {
      int opt = mi_getopt ("-break-watch", argc, argv,
			   opts, &optind, &optarg);

      if (opt < 0)
	break;
      switch ((enum opt) opt)
	{
	case READ_OPT:
	  type = READ_WP;
	  break;
	case ACCESS_OPT:
	  type = ACCESS_WP;
	  break;
	}
    }
  if (optind >= argc)
    error (_("-break-watch: Missing <expression>"));
  if (optind < argc - 1)
    error (_("-break-watch: Garbage following <expression>"));
  expr = argv[optind];

  /* Now we have what we need, let's insert the watchpoint! */
  switch (type)
    {
    case REG_WP:
      watch_command_wrapper (expr, FROM_TTY, 0);
      break;
    case READ_WP:
      rwatch_command_wrapper (expr, FROM_TTY, 0);
      break;
    case ACCESS_WP:
      awatch_command_wrapper (expr, FROM_TTY, 0);
      break;
    default:
      error (_("-break-watch: Unknown watchpoint type."));
    }
}

/* The mi_read_next_line consults these variable to return successive
   command lines.  While it would be clearer to use a closure pointer,
   it is not expected that any future code will use read_command_lines_1,
   therefore no point of overengineering.  */

static char **mi_command_line_array;
static int mi_command_line_array_cnt;
static int mi_command_line_array_ptr;

static char *
mi_read_next_line (void)
{
  if (mi_command_line_array_ptr == mi_command_line_array_cnt)
    return NULL;
  else
    return mi_command_line_array[mi_command_line_array_ptr++];
}

void
mi_cmd_break_commands (char *command, char **argv, int argc)
{
  struct command_line *break_command;
  char *endptr;
  int bnum;
  struct breakpoint *b;

  if (argc < 1)
    error (_("USAGE: %s <BKPT> [<COMMAND> [<COMMAND>...]]"), command);

  bnum = strtol (argv[0], &endptr, 0);
  if (endptr == argv[0])
    error (_("breakpoint number argument \"%s\" is not a number."),
	   argv[0]);
  else if (*endptr != '\0')
    error (_("junk at the end of breakpoint number argument \"%s\"."),
	   argv[0]);

  b = get_breakpoint (bnum);
  if (b == NULL)
    error (_("breakpoint %d not found."), bnum);

  mi_command_line_array = argv;
  mi_command_line_array_ptr = 1;
  mi_command_line_array_cnt = argc;

  if (is_tracepoint (b))
    break_command = read_command_lines_1 (mi_read_next_line, 1,
					  check_tracepoint_command, b);
  else
    break_command = read_command_lines_1 (mi_read_next_line, 1, 0, 0);

  breakpoint_set_commands (b, break_command);
}