/* MI Command Set.

   Copyright (C) 2000-2005, 2007-2012 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 "target.h"
#include "inferior.h"
#include "gdb_string.h"
#include "exceptions.h"
#include "top.h"
#include "gdbthread.h"
#include "mi-cmds.h"
#include "mi-parse.h"
#include "mi-getopt.h"
#include "mi-console.h"
#include "ui-out.h"
#include "mi-out.h"
#include "interps.h"
#include "event-loop.h"
#include "event-top.h"
#include "gdbcore.h"		/* For write_memory().  */
#include "value.h"
#include "regcache.h"
#include "gdb.h"
#include "frame.h"
#include "mi-main.h"
#include "mi-common.h"
#include "language.h"
#include "valprint.h"
#include "inferior.h"
#include "osdata.h"
#include "splay-tree.h"
#include "tracepoint.h"
#include "ada-lang.h"
#include "linespec.h"

#include <ctype.h>
#include <sys/time.h>

#if defined HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif

#ifdef HAVE_GETRUSAGE
struct rusage rusage;
#endif

enum
  {
    FROM_TTY = 0
  };

int mi_debug_p;

struct ui_file *raw_stdout;

/* This is used to pass the current command timestamp down to
   continuation routines.  */
static struct mi_timestamp *current_command_ts;

static int do_timings = 0;

char *current_token;
/* Few commands would like to know if options like --thread-group were
   explicitly specified.  This variable keeps the current parsed
   command including all option, and make it possible.  */
static struct mi_parse *current_context;

int running_result_record_printed = 1;

/* Flag indicating that the target has proceeded since the last
   command was issued.  */
int mi_proceeded;

extern void _initialize_mi_main (void);
static void mi_cmd_execute (struct mi_parse *parse);

static void mi_execute_cli_command (const char *cmd, int args_p,
				    const char *args);
static void mi_execute_async_cli_command (char *cli_command, 
					  char **argv, int argc);
static int register_changed_p (int regnum, struct regcache *,
			       struct regcache *);
static void get_register (struct frame_info *, int regnum, int format);

/* Command implementations.  FIXME: Is this libgdb?  No.  This is the MI
   layer that calls libgdb.  Any operation used in the below should be
   formalized.  */

static void timestamp (struct mi_timestamp *tv);

static void print_diff_now (struct mi_timestamp *start);
static void print_diff (struct mi_timestamp *start, struct mi_timestamp *end);

void
mi_cmd_gdb_exit (char *command, char **argv, int argc)
{
  /* We have to print everything right here because we never return.  */
  if (current_token)
    fputs_unfiltered (current_token, raw_stdout);
  fputs_unfiltered ("^exit\n", raw_stdout);
  mi_out_put (current_uiout, raw_stdout);
  gdb_flush (raw_stdout);
  /* FIXME: The function called is not yet a formal libgdb function.  */
  quit_force (NULL, FROM_TTY);
}

void
mi_cmd_exec_next (char *command, char **argv, int argc)
{
  /* FIXME: Should call a libgdb function, not a cli wrapper.  */
  if (argc > 0 && strcmp(argv[0], "--reverse") == 0)
    mi_execute_async_cli_command ("reverse-next", argv + 1, argc - 1);
  else
    mi_execute_async_cli_command ("next", argv, argc);
}

void
mi_cmd_exec_next_instruction (char *command, char **argv, int argc)
{
  /* FIXME: Should call a libgdb function, not a cli wrapper.  */
  if (argc > 0 && strcmp(argv[0], "--reverse") == 0)
    mi_execute_async_cli_command ("reverse-nexti", argv + 1, argc - 1);
  else
    mi_execute_async_cli_command ("nexti", argv, argc);
}

void
mi_cmd_exec_step (char *command, char **argv, int argc)
{
  /* FIXME: Should call a libgdb function, not a cli wrapper.  */
  if (argc > 0 && strcmp(argv[0], "--reverse") == 0)
    mi_execute_async_cli_command ("reverse-step", argv + 1, argc - 1);
  else
    mi_execute_async_cli_command ("step", argv, argc);
}

void
mi_cmd_exec_step_instruction (char *command, char **argv, int argc)
{
  /* FIXME: Should call a libgdb function, not a cli wrapper.  */
  if (argc > 0 && strcmp(argv[0], "--reverse") == 0)
    mi_execute_async_cli_command ("reverse-stepi", argv + 1, argc - 1);
  else
    mi_execute_async_cli_command ("stepi", argv, argc);
}

void
mi_cmd_exec_finish (char *command, char **argv, int argc)
{
  /* FIXME: Should call a libgdb function, not a cli wrapper.  */
  if (argc > 0 && strcmp(argv[0], "--reverse") == 0)
    mi_execute_async_cli_command ("reverse-finish", argv + 1, argc - 1);
  else
    mi_execute_async_cli_command ("finish", argv, argc);
}

void
mi_cmd_exec_return (char *command, char **argv, int argc)
{
  /* This command doesn't really execute the target, it just pops the
     specified number of frames.  */
  if (argc)
    /* Call return_command with from_tty argument equal to 0 so as to
       avoid being queried.  */
    return_command (*argv, 0);
  else
    /* Call return_command with from_tty argument equal to 0 so as to
       avoid being queried.  */
    return_command (NULL, 0);

  /* Because we have called return_command with from_tty = 0, we need
     to print the frame here.  */
  print_stack_frame (get_selected_frame (NULL), 1, LOC_AND_ADDRESS);
}

void
mi_cmd_exec_jump (char *args, char **argv, int argc)
{
  /* FIXME: Should call a libgdb function, not a cli wrapper.  */
  mi_execute_async_cli_command ("jump", argv, argc);
}
 
static void
proceed_thread (struct thread_info *thread, int pid)
{
  if (!is_stopped (thread->ptid))
    return;

  if (pid != 0 && PIDGET (thread->ptid) != pid)
    return;

  switch_to_thread (thread->ptid);
  clear_proceed_status ();
  proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT, 0);
}

static int
proceed_thread_callback (struct thread_info *thread, void *arg)
{
  int pid = *(int *)arg;

  proceed_thread (thread, pid);
  return 0;
}

static void
exec_continue (char **argv, int argc)
{
  if (non_stop)
    {
      /* In non-stop mode, 'resume' always resumes a single thread.
	 Therefore, to resume all threads of the current inferior, or
	 all threads in all inferiors, we need to iterate over
	 threads.

	 See comment on infcmd.c:proceed_thread_callback for rationale.  */
      if (current_context->all || current_context->thread_group != -1)
	{
	  int pid = 0;
	  struct cleanup *back_to = make_cleanup_restore_current_thread ();

	  if (!current_context->all)
	    {
	      struct inferior *inf
		= find_inferior_id (current_context->thread_group);

	      pid = inf->pid;
	    }
	  iterate_over_threads (proceed_thread_callback, &pid);
	  do_cleanups (back_to);
	}
      else
	{
	  continue_1 (0);
	}
    }
  else
    {
      struct cleanup *back_to = make_cleanup_restore_integer (&sched_multi);

      if (current_context->all)
	{
	  sched_multi = 1;
	  continue_1 (0);
	}
      else
	{
	  /* In all-stop mode, -exec-continue traditionally resumed
	     either all threads, or one thread, depending on the
	     'scheduler-locking' variable.  Let's continue to do the
	     same.  */
	  continue_1 (1);
	}
      do_cleanups (back_to);
    }
}

static void
exec_direction_forward (void *notused)
{
  execution_direction = EXEC_FORWARD;
}

static void
exec_reverse_continue (char **argv, int argc)
{
  enum exec_direction_kind dir = execution_direction;
  struct cleanup *old_chain;

  if (dir == EXEC_REVERSE)
    error (_("Already in reverse mode."));

  if (!target_can_execute_reverse)
    error (_("Target %s does not support this command."), target_shortname);

  old_chain = make_cleanup (exec_direction_forward, NULL);
  execution_direction = EXEC_REVERSE;
  exec_continue (argv, argc);
  do_cleanups (old_chain);
}

void
mi_cmd_exec_continue (char *command, char **argv, int argc)
{
  if (argc > 0 && strcmp (argv[0], "--reverse") == 0)
    exec_reverse_continue (argv + 1, argc - 1);
  else
    exec_continue (argv, argc);
}

static int
interrupt_thread_callback (struct thread_info *thread, void *arg)
{
  int pid = *(int *)arg;

  if (!is_running (thread->ptid))
    return 0;

  if (PIDGET (thread->ptid) != pid)
    return 0;

  target_stop (thread->ptid);
  return 0;
}

/* Interrupt the execution of the target.  Note how we must play
   around with the token variables, in order to display the current
   token in the result of the interrupt command, and the previous
   execution token when the target finally stops.  See comments in
   mi_cmd_execute.  */

void
mi_cmd_exec_interrupt (char *command, char **argv, int argc)
{
  /* In all-stop mode, everything stops, so we don't need to try
     anything specific.  */
  if (!non_stop)
    {
      interrupt_target_1 (0);
      return;
    }

  if (current_context->all)
    {
      /* This will interrupt all threads in all inferiors.  */
      interrupt_target_1 (1);
    }
  else if (current_context->thread_group != -1)
    {
      struct inferior *inf = find_inferior_id (current_context->thread_group);

      iterate_over_threads (interrupt_thread_callback, &inf->pid);
    }
  else
    {
      /* Interrupt just the current thread -- either explicitly
	 specified via --thread or whatever was current before
	 MI command was sent.  */
      interrupt_target_1 (0);
    }
}

static int
run_one_inferior (struct inferior *inf, void *arg)
{
  if (inf->pid != 0)
    {
      if (inf->pid != ptid_get_pid (inferior_ptid))
	{
	  struct thread_info *tp;

	  tp = any_thread_of_process (inf->pid);
	  if (!tp)
	    error (_("Inferior has no threads."));

	  switch_to_thread (tp->ptid);
	}
    }
  else
    {
      set_current_inferior (inf);
      switch_to_thread (null_ptid);
      set_current_program_space (inf->pspace);
    }
  mi_execute_cli_command ("run", target_can_async_p (),
			  target_can_async_p () ? "&" : NULL);
  return 0;
}

void
mi_cmd_exec_run (char *command, char **argv, int argc)
{
  if (current_context->all)
    {
      struct cleanup *back_to = save_current_space_and_thread ();

      iterate_over_inferiors (run_one_inferior, NULL);
      do_cleanups (back_to);
    }
  else
    {
      mi_execute_cli_command ("run", target_can_async_p (),
			      target_can_async_p () ? "&" : NULL);
    }
}


static int
find_thread_of_process (struct thread_info *ti, void *p)
{
  int pid = *(int *)p;

  if (PIDGET (ti->ptid) == pid && !is_exited (ti->ptid))
    return 1;

  return 0;
}

void
mi_cmd_target_detach (char *command, char **argv, int argc)
{
  if (argc != 0 && argc != 1)
    error (_("Usage: -target-detach [pid | thread-group]"));

  if (argc == 1)
    {
      struct thread_info *tp;
      char *end = argv[0];
      int pid;

      /* First see if we are dealing with a thread-group id.  */
      if (*argv[0] == 'i')
	{
	  struct inferior *inf;
	  int id = strtoul (argv[0] + 1, &end, 0);

	  if (*end != '\0')
	    error (_("Invalid syntax of thread-group id '%s'"), argv[0]);

	  inf = find_inferior_id (id);
	  if (!inf)
	    error (_("Non-existent thread-group id '%d'"), id);

	  pid = inf->pid;
	}
      else
	{
	  /* We must be dealing with a pid.  */
	  pid = strtol (argv[0], &end, 10);

	  if (*end != '\0')
	    error (_("Invalid identifier '%s'"), argv[0]);
	}

      /* Pick any thread in the desired process.  Current
	 target_detach detaches from the parent of inferior_ptid.  */
      tp = iterate_over_threads (find_thread_of_process, &pid);
      if (!tp)
	error (_("Thread group is empty"));

      switch_to_thread (tp->ptid);
    }

  detach_command (NULL, 0);
}

void
mi_cmd_thread_select (char *command, char **argv, int argc)
{
  enum gdb_rc rc;
  char *mi_error_message;

  if (argc != 1)
    error (_("-thread-select: USAGE: threadnum."));

  rc = gdb_thread_select (current_uiout, argv[0], &mi_error_message);

  if (rc == GDB_RC_FAIL)
    {
      make_cleanup (xfree, mi_error_message);
      error ("%s", mi_error_message);
    }
}

void
mi_cmd_thread_list_ids (char *command, char **argv, int argc)
{
  enum gdb_rc rc;
  char *mi_error_message;

  if (argc != 0)
    error (_("-thread-list-ids: No arguments required."));

  rc = gdb_list_thread_ids (current_uiout, &mi_error_message);

  if (rc == GDB_RC_FAIL)
    {
      make_cleanup (xfree, mi_error_message);
      error ("%s", mi_error_message);
    }
}

void
mi_cmd_thread_info (char *command, char **argv, int argc)
{
  if (argc != 0 && argc != 1)
    error (_("Invalid MI command"));

  print_thread_info (current_uiout, argv[0], -1);
}

DEF_VEC_I(int);

struct collect_cores_data
{
  int pid;

  VEC (int) *cores;
};

static int
collect_cores (struct thread_info *ti, void *xdata)
{
  struct collect_cores_data *data = xdata;

  if (ptid_get_pid (ti->ptid) == data->pid)
    {
      int core = target_core_of_thread (ti->ptid);

      if (core != -1)
	VEC_safe_push (int, data->cores, core);
    }

  return 0;
}

static int *
unique (int *b, int *e)
{
  int *d = b;

  while (++b != e)
    if (*d != *b)
      *++d = *b;
  return ++d;
}

struct print_one_inferior_data
{
  int recurse;
  VEC (int) *inferiors;
};

static int
print_one_inferior (struct inferior *inferior, void *xdata)
{
  struct print_one_inferior_data *top_data = xdata;
  struct ui_out *uiout = current_uiout;

  if (VEC_empty (int, top_data->inferiors)
      || bsearch (&(inferior->pid), VEC_address (int, top_data->inferiors),
		  VEC_length (int, top_data->inferiors), sizeof (int),
		  compare_positive_ints))
    {
      struct collect_cores_data data;
      struct cleanup *back_to
	= make_cleanup_ui_out_tuple_begin_end (uiout, NULL);

      ui_out_field_fmt (uiout, "id", "i%d", inferior->num);
      ui_out_field_string (uiout, "type", "process");
      if (inferior->pid != 0)
	ui_out_field_int (uiout, "pid", inferior->pid);

      if (inferior->pspace->ebfd)
	{
	  ui_out_field_string (uiout, "executable",
			       bfd_get_filename (inferior->pspace->ebfd));
	}

      data.cores = 0;
      if (inferior->pid != 0)
	{
	  data.pid = inferior->pid;
	  iterate_over_threads (collect_cores, &data);
	}

      if (!VEC_empty (int, data.cores))
	{
	  int *b, *e;
	  struct cleanup *back_to_2 =
	    make_cleanup_ui_out_list_begin_end (uiout, "cores");

	  qsort (VEC_address (int, data.cores),
		 VEC_length (int, data.cores), sizeof (int),
		 compare_positive_ints);

	  b = VEC_address (int, data.cores);
	  e = b + VEC_length (int, data.cores);
	  e = unique (b, e);

	  for (; b != e; ++b)
	    ui_out_field_int (uiout, NULL, *b);

	  do_cleanups (back_to_2);
	}

      if (top_data->recurse)
	print_thread_info (uiout, NULL, inferior->pid);

      do_cleanups (back_to);
    }

  return 0;
}

/* Output a field named 'cores' with a list as the value.  The
   elements of the list are obtained by splitting 'cores' on
   comma.  */

static void
output_cores (struct ui_out *uiout, const char *field_name, const char *xcores)
{
  struct cleanup *back_to = make_cleanup_ui_out_list_begin_end (uiout,
								field_name);
  char *cores = xstrdup (xcores);
  char *p = cores;

  make_cleanup (xfree, cores);

  for (p = strtok (p, ","); p;  p = strtok (NULL, ","))
    ui_out_field_string (uiout, NULL, p);

  do_cleanups (back_to);
}

static void
free_vector_of_ints (void *xvector)
{
  VEC (int) **vector = xvector;

  VEC_free (int, *vector);
}

static void
do_nothing (splay_tree_key k)
{
}

static void
free_vector_of_osdata_items (splay_tree_value xvalue)
{
  VEC (osdata_item_s) *value = (VEC (osdata_item_s) *) xvalue;

  /* We don't free the items itself, it will be done separately.  */
  VEC_free (osdata_item_s, value);
}

static int
splay_tree_int_comparator (splay_tree_key xa, splay_tree_key xb)
{
  int a = xa;
  int b = xb;

  return a - b;
}

static void
free_splay_tree (void *xt)
{
  splay_tree t = xt;
  splay_tree_delete (t);
}

static void
list_available_thread_groups (VEC (int) *ids, int recurse)
{
  struct osdata *data;
  struct osdata_item *item;
  int ix_items;
  struct ui_out *uiout = current_uiout;

  /* This keeps a map from integer (pid) to VEC (struct osdata_item *)*
     The vector contains information about all threads for the given pid.
     This is assigned an initial value to avoid "may be used uninitialized"
     warning from gcc.  */
  splay_tree tree = NULL;

  /* get_osdata will throw if it cannot return data.  */
  data = get_osdata ("processes");
  make_cleanup_osdata_free (data);

  if (recurse)
    {
      struct osdata *threads = get_osdata ("threads");

      make_cleanup_osdata_free (threads);
      tree = splay_tree_new (splay_tree_int_comparator,
			     do_nothing,
			     free_vector_of_osdata_items);
      make_cleanup (free_splay_tree, tree);

      for (ix_items = 0;
	   VEC_iterate (osdata_item_s, threads->items,
			ix_items, item);
	   ix_items++)
	{
	  const char *pid = get_osdata_column (item, "pid");
	  int pid_i = strtoul (pid, NULL, 0);
	  VEC (osdata_item_s) *vec = 0;

	  splay_tree_node n = splay_tree_lookup (tree, pid_i);
	  if (!n)
	    {
	      VEC_safe_push (osdata_item_s, vec, item);
	      splay_tree_insert (tree, pid_i, (splay_tree_value)vec);
	    }
	  else
	    {
	      vec = (VEC (osdata_item_s) *) n->value;
	      VEC_safe_push (osdata_item_s, vec, item);
	      n->value = (splay_tree_value) vec;
	    }
	}
    }

  make_cleanup_ui_out_list_begin_end (uiout, "groups");

  for (ix_items = 0;
       VEC_iterate (osdata_item_s, data->items,
		    ix_items, item);
       ix_items++)
    {
      struct cleanup *back_to;

      const char *pid = get_osdata_column (item, "pid");
      const char *cmd = get_osdata_column (item, "command");
      const char *user = get_osdata_column (item, "user");
      const char *cores = get_osdata_column (item, "cores");

      int pid_i = strtoul (pid, NULL, 0);

      /* At present, the target will return all available processes
	 and if information about specific ones was required, we filter
	 undesired processes here.  */
      if (ids && bsearch (&pid_i, VEC_address (int, ids),
			  VEC_length (int, ids),
			  sizeof (int), compare_positive_ints) == NULL)
	continue;


      back_to = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);

      ui_out_field_fmt (uiout, "id", "%s", pid);
      ui_out_field_string (uiout, "type", "process");
      if (cmd)
	ui_out_field_string (uiout, "description", cmd);
      if (user)
	ui_out_field_string (uiout, "user", user);
      if (cores)
	output_cores (uiout, "cores", cores);

      if (recurse)
	{
	  splay_tree_node n = splay_tree_lookup (tree, pid_i);
	  if (n)
	    {
	      VEC (osdata_item_s) *children = (VEC (osdata_item_s) *) n->value;
	      struct osdata_item *child;
	      int ix_child;

	      make_cleanup_ui_out_list_begin_end (uiout, "threads");

	      for (ix_child = 0;
		   VEC_iterate (osdata_item_s, children, ix_child, child);
		   ++ix_child)
		{
		  struct cleanup *back_to_2 =
		    make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
		  const char *tid = get_osdata_column (child, "tid");
		  const char *tcore = get_osdata_column (child, "core");

		  ui_out_field_string (uiout, "id", tid);
		  if (tcore)
		    ui_out_field_string (uiout, "core", tcore);

		  do_cleanups (back_to_2);
		}
	    }
	}

      do_cleanups (back_to);
    }
}

void
mi_cmd_list_thread_groups (char *command, char **argv, int argc)
{
  struct ui_out *uiout = current_uiout;
  struct cleanup *back_to;
  int available = 0;
  int recurse = 0;
  VEC (int) *ids = 0;

  enum opt
  {
    AVAILABLE_OPT, RECURSE_OPT
  };
  static const struct mi_opt opts[] =
    {
      {"-available", AVAILABLE_OPT, 0},
      {"-recurse", RECURSE_OPT, 1},
      { 0, 0, 0 }
    };

  int oind = 0;
  char *oarg;

  while (1)
    {
      int opt = mi_getopt ("-list-thread-groups", argc, argv, opts,
			   &oind, &oarg);

      if (opt < 0)
	break;
      switch ((enum opt) opt)
	{
	case AVAILABLE_OPT:
	  available = 1;
	  break;
	case RECURSE_OPT:
	  if (strcmp (oarg, "0") == 0)
	    ;
	  else if (strcmp (oarg, "1") == 0)
	    recurse = 1;
	  else
	    error (_("only '0' and '1' are valid values "
		     "for the '--recurse' option"));
	  break;
	}
    }

  for (; oind < argc; ++oind)
    {
      char *end;
      int inf;

      if (*(argv[oind]) != 'i')
	error (_("invalid syntax of group id '%s'"), argv[oind]);

      inf = strtoul (argv[oind] + 1, &end, 0);

      if (*end != '\0')
	error (_("invalid syntax of group id '%s'"), argv[oind]);
      VEC_safe_push (int, ids, inf);
    }
  if (VEC_length (int, ids) > 1)
    qsort (VEC_address (int, ids),
	   VEC_length (int, ids),
	   sizeof (int), compare_positive_ints);

  back_to = make_cleanup (free_vector_of_ints, &ids);

  if (available)
    {
      list_available_thread_groups (ids, recurse);
    }
  else if (VEC_length (int, ids) == 1)
    {
      /* Local thread groups, single id.  */
      int id = *VEC_address (int, ids);
      struct inferior *inf = find_inferior_id (id);

      if (!inf)
	error (_("Non-existent thread group id '%d'"), id);
      
      print_thread_info (uiout, NULL, inf->pid);
    }
  else
    {
      struct print_one_inferior_data data;

      data.recurse = recurse;
      data.inferiors = ids;

      /* Local thread groups.  Either no explicit ids -- and we
	 print everything, or several explicit ids.  In both cases,
	 we print more than one group, and have to use 'groups'
	 as the top-level element.  */
      make_cleanup_ui_out_list_begin_end (uiout, "groups");
      update_thread_list ();
      iterate_over_inferiors (print_one_inferior, &data);
    }

  do_cleanups (back_to);
}

void
mi_cmd_data_list_register_names (char *command, char **argv, int argc)
{
  struct gdbarch *gdbarch;
  struct ui_out *uiout = current_uiout;
  int regnum, numregs;
  int i;
  struct cleanup *cleanup;

  /* Note that the test for a valid register must include checking the
     gdbarch_register_name because gdbarch_num_regs may be allocated
     for the union of the register sets within a family of related
     processors.  In this case, some entries of gdbarch_register_name
     will change depending upon the particular processor being
     debugged.  */

  gdbarch = get_current_arch ();
  numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);

  cleanup = make_cleanup_ui_out_list_begin_end (uiout, "register-names");

  if (argc == 0)		/* No args, just do all the regs.  */
    {
      for (regnum = 0;
	   regnum < numregs;
	   regnum++)
	{
	  if (gdbarch_register_name (gdbarch, regnum) == NULL
	      || *(gdbarch_register_name (gdbarch, regnum)) == '\0')
	    ui_out_field_string (uiout, NULL, "");
	  else
	    ui_out_field_string (uiout, NULL,
				 gdbarch_register_name (gdbarch, regnum));
	}
    }

  /* Else, list of register #s, just do listed regs.  */
  for (i = 0; i < argc; i++)
    {
      regnum = atoi (argv[i]);
      if (regnum < 0 || regnum >= numregs)
	error (_("bad register number"));

      if (gdbarch_register_name (gdbarch, regnum) == NULL
	  || *(gdbarch_register_name (gdbarch, regnum)) == '\0')
	ui_out_field_string (uiout, NULL, "");
      else
	ui_out_field_string (uiout, NULL,
			     gdbarch_register_name (gdbarch, regnum));
    }
  do_cleanups (cleanup);
}

void
mi_cmd_data_list_changed_registers (char *command, char **argv, int argc)
{
  static struct regcache *this_regs = NULL;
  struct ui_out *uiout = current_uiout;
  struct regcache *prev_regs;
  struct gdbarch *gdbarch;
  int regnum, numregs, changed;
  int i;
  struct cleanup *cleanup;

  /* The last time we visited this function, the current frame's
     register contents were saved in THIS_REGS.  Move THIS_REGS over
     to PREV_REGS, and refresh THIS_REGS with the now-current register
     contents.  */

  prev_regs = this_regs;
  this_regs = frame_save_as_regcache (get_selected_frame (NULL));
  cleanup = make_cleanup_regcache_xfree (prev_regs);

  /* Note that the test for a valid register must include checking the
     gdbarch_register_name because gdbarch_num_regs may be allocated
     for the union of the register sets within a family of related
     processors.  In this case, some entries of gdbarch_register_name
     will change depending upon the particular processor being
     debugged.  */

  gdbarch = get_regcache_arch (this_regs);
  numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);

  make_cleanup_ui_out_list_begin_end (uiout, "changed-registers");

  if (argc == 0)
    {
      /* No args, just do all the regs.  */
      for (regnum = 0;
	   regnum < numregs;
	   regnum++)
	{
	  if (gdbarch_register_name (gdbarch, regnum) == NULL
	      || *(gdbarch_register_name (gdbarch, regnum)) == '\0')
	    continue;
	  changed = register_changed_p (regnum, prev_regs, this_regs);
	  if (changed < 0)
	    error (_("-data-list-changed-registers: "
		     "Unable to read register contents."));
	  else if (changed)
	    ui_out_field_int (uiout, NULL, regnum);
	}
    }

  /* Else, list of register #s, just do listed regs.  */
  for (i = 0; i < argc; i++)
    {
      regnum = atoi (argv[i]);

      if (regnum >= 0
	  && regnum < numregs
	  && gdbarch_register_name (gdbarch, regnum) != NULL
	  && *gdbarch_register_name (gdbarch, regnum) != '\000')
	{
	  changed = register_changed_p (regnum, prev_regs, this_regs);
	  if (changed < 0)
	    error (_("-data-list-changed-registers: "
		     "Unable to read register contents."));
	  else if (changed)
	    ui_out_field_int (uiout, NULL, regnum);
	}
      else
	error (_("bad register number"));
    }
  do_cleanups (cleanup);
}

static int
register_changed_p (int regnum, struct regcache *prev_regs,
		    struct regcache *this_regs)
{
  struct gdbarch *gdbarch = get_regcache_arch (this_regs);
  gdb_byte prev_buffer[MAX_REGISTER_SIZE];
  gdb_byte this_buffer[MAX_REGISTER_SIZE];
  enum register_status prev_status;
  enum register_status this_status;

  /* First time through or after gdbarch change consider all registers
     as changed.  */
  if (!prev_regs || get_regcache_arch (prev_regs) != gdbarch)
    return 1;

  /* Get register contents and compare.  */
  prev_status = regcache_cooked_read (prev_regs, regnum, prev_buffer);
  this_status = regcache_cooked_read (this_regs, regnum, this_buffer);

  if (this_status != prev_status)
    return 1;
  else if (this_status == REG_VALID)
    return memcmp (prev_buffer, this_buffer,
		   register_size (gdbarch, regnum)) != 0;
  else
    return 0;
}

/* Return a list of register number and value pairs.  The valid
   arguments expected are: a letter indicating the format in which to
   display the registers contents.  This can be one of: x
   (hexadecimal), d (decimal), N (natural), t (binary), o (octal), r
   (raw).  After the format argument there can be a sequence of
   numbers, indicating which registers to fetch the content of.  If
   the format is the only argument, a list of all the registers with
   their values is returned.  */

void
mi_cmd_data_list_register_values (char *command, char **argv, int argc)
{
  struct ui_out *uiout = current_uiout;
  struct frame_info *frame;
  struct gdbarch *gdbarch;
  int regnum, numregs, format;
  int i;
  struct cleanup *list_cleanup, *tuple_cleanup;

  /* Note that the test for a valid register must include checking the
     gdbarch_register_name because gdbarch_num_regs may be allocated
     for the union of the register sets within a family of related
     processors.  In this case, some entries of gdbarch_register_name
     will change depending upon the particular processor being
     debugged.  */

  if (argc == 0)
    error (_("-data-list-register-values: Usage: "
	     "-data-list-register-values <format> [<regnum1>...<regnumN>]"));

  format = (int) argv[0][0];

  frame = get_selected_frame (NULL);
  gdbarch = get_frame_arch (frame);
  numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);

  list_cleanup = make_cleanup_ui_out_list_begin_end (uiout, "register-values");

  if (argc == 1)
    {
      /* No args, beside the format: do all the regs.  */
      for (regnum = 0;
	   regnum < numregs;
	   regnum++)
	{
	  if (gdbarch_register_name (gdbarch, regnum) == NULL
	      || *(gdbarch_register_name (gdbarch, regnum)) == '\0')
	    continue;
	  tuple_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
	  ui_out_field_int (uiout, "number", regnum);
	  get_register (frame, regnum, format);
	  do_cleanups (tuple_cleanup);
	}
    }

  /* Else, list of register #s, just do listed regs.  */
  for (i = 1; i < argc; i++)
    {
      regnum = atoi (argv[i]);

      if (regnum >= 0
	  && regnum < numregs
	  && gdbarch_register_name (gdbarch, regnum) != NULL
	  && *gdbarch_register_name (gdbarch, regnum) != '\000')
	{
	  tuple_cleanup = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
	  ui_out_field_int (uiout, "number", regnum);
	  get_register (frame, regnum, format);
	  do_cleanups (tuple_cleanup);
	}
      else
	error (_("bad register number"));
    }
  do_cleanups (list_cleanup);
}

/* Output one register's contents in the desired format.  */

static void
get_register (struct frame_info *frame, int regnum, int format)
{
  struct gdbarch *gdbarch = get_frame_arch (frame);
  struct ui_out *uiout = current_uiout;
  struct value *val;

  if (format == 'N')
    format = 0;

  val = get_frame_register_value (frame, regnum);

  if (value_optimized_out (val))
    error (_("Optimized out"));

  if (format == 'r')
    {
      int j;
      char *ptr, buf[1024];
      const gdb_byte *valaddr = value_contents_for_printing (val);

      strcpy (buf, "0x");
      ptr = buf + 2;
      for (j = 0; j < register_size (gdbarch, regnum); j++)
	{
	  int idx = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ?
		    j : register_size (gdbarch, regnum) - 1 - j;

	  sprintf (ptr, "%02x", (unsigned char) valaddr[idx]);
	  ptr += 2;
	}
      ui_out_field_string (uiout, "value", buf);
    }
  else
    {
      struct value_print_options opts;
      struct ui_file *stb;
      struct cleanup *old_chain;

      stb = mem_fileopen ();
      old_chain = make_cleanup_ui_file_delete (stb);

      get_formatted_print_options (&opts, format);
      opts.deref_ref = 1;
      val_print (value_type (val),
		 value_contents_for_printing (val),
		 value_embedded_offset (val), 0,
		 stb, 0, val, &opts, current_language);
      ui_out_field_stream (uiout, "value", stb);
      do_cleanups (old_chain);
    }
}

/* Write given values into registers. The registers and values are
   given as pairs.  The corresponding MI command is 
   -data-write-register-values <format>
                               [<regnum1> <value1>...<regnumN> <valueN>] */
void
mi_cmd_data_write_register_values (char *command, char **argv, int argc)
{
  struct regcache *regcache;
  struct gdbarch *gdbarch;
  int numregs, i;
  char format;

  /* Note that the test for a valid register must include checking the
     gdbarch_register_name because gdbarch_num_regs may be allocated
     for the union of the register sets within a family of related
     processors.  In this case, some entries of gdbarch_register_name
     will change depending upon the particular processor being
     debugged.  */

  regcache = get_current_regcache ();
  gdbarch = get_regcache_arch (regcache);
  numregs = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);

  if (argc == 0)
    error (_("-data-write-register-values: Usage: -data-write-register-"
	     "values <format> [<regnum1> <value1>...<regnumN> <valueN>]"));

  format = (int) argv[0][0];

  if (!target_has_registers)
    error (_("-data-write-register-values: No registers."));

  if (!(argc - 1))
    error (_("-data-write-register-values: No regs and values specified."));

  if ((argc - 1) % 2)
    error (_("-data-write-register-values: "
	     "Regs and vals are not in pairs."));

  for (i = 1; i < argc; i = i + 2)
    {
      int regnum = atoi (argv[i]);

      if (regnum >= 0 && regnum < numregs
	  && gdbarch_register_name (gdbarch, regnum)
	  && *gdbarch_register_name (gdbarch, regnum))
	{
	  LONGEST value;

	  /* Get the value as a number.  */
	  value = parse_and_eval_address (argv[i + 1]);

	  /* Write it down.  */
	  regcache_cooked_write_signed (regcache, regnum, value);
	}
      else
	error (_("bad register number"));
    }
}

/* Evaluate the value of the argument.  The argument is an
   expression. If the expression contains spaces it needs to be
   included in double quotes.  */

void
mi_cmd_data_evaluate_expression (char *command, char **argv, int argc)
{
  struct expression *expr;
  struct cleanup *old_chain;
  struct value *val;
  struct ui_file *stb;
  struct value_print_options opts;
  struct ui_out *uiout = current_uiout;

  stb = mem_fileopen ();
  old_chain = make_cleanup_ui_file_delete (stb);

  if (argc != 1)
    error (_("-data-evaluate-expression: "
	     "Usage: -data-evaluate-expression expression"));

  expr = parse_expression (argv[0]);

  make_cleanup (free_current_contents, &expr);

  val = evaluate_expression (expr);

  /* Print the result of the expression evaluation.  */
  get_user_print_options (&opts);
  opts.deref_ref = 0;
  common_val_print (val, stb, 0, &opts, current_language);

  ui_out_field_stream (uiout, "value", stb);

  do_cleanups (old_chain);
}

/* This is the -data-read-memory command.

   ADDR: start address of data to be dumped.
   WORD-FORMAT: a char indicating format for the ``word''.  See 
   the ``x'' command.
   WORD-SIZE: size of each ``word''; 1,2,4, or 8 bytes.
   NR_ROW: Number of rows.
   NR_COL: The number of colums (words per row).
   ASCHAR: (OPTIONAL) Append an ascii character dump to each row.  Use
   ASCHAR for unprintable characters.

   Reads SIZE*NR_ROW*NR_COL bytes starting at ADDR from memory and
   displayes them.  Returns:

   {addr="...",rowN={wordN="..." ,... [,ascii="..."]}, ...}

   Returns: 
   The number of bytes read is SIZE*ROW*COL.  */

void
mi_cmd_data_read_memory (char *command, char **argv, int argc)
{
  struct gdbarch *gdbarch = get_current_arch ();
  struct ui_out *uiout = current_uiout;
  struct cleanup *cleanups = make_cleanup (null_cleanup, NULL);
  CORE_ADDR addr;
  long total_bytes, nr_cols, nr_rows;
  char word_format;
  struct type *word_type;
  long word_size;
  char word_asize;
  char aschar;
  gdb_byte *mbuf;
  int nr_bytes;
  long offset = 0;
  int oind = 0;
  char *oarg;
  enum opt
  {
    OFFSET_OPT
  };
  static const struct mi_opt opts[] =
    {
      {"o", OFFSET_OPT, 1},
      { 0, 0, 0 }
    };

  while (1)
    {
      int opt = mi_getopt ("-data-read-memory", argc, argv, opts,
			   &oind, &oarg);

      if (opt < 0)
	break;
      switch ((enum opt) opt)
	{
	case OFFSET_OPT:
	  offset = atol (oarg);
	  break;
	}
    }
  argv += oind;
  argc -= oind;

  if (argc < 5 || argc > 6)
    error (_("-data-read-memory: Usage: "
	     "ADDR WORD-FORMAT WORD-SIZE NR-ROWS NR-COLS [ASCHAR]."));

  /* Extract all the arguments. */

  /* Start address of the memory dump.  */
  addr = parse_and_eval_address (argv[0]) + offset;
  /* The format character to use when displaying a memory word.  See
     the ``x'' command.  */
  word_format = argv[1][0];
  /* The size of the memory word.  */
  word_size = atol (argv[2]);
  switch (word_size)
    {
    case 1:
      word_type = builtin_type (gdbarch)->builtin_int8;
      word_asize = 'b';
      break;
    case 2:
      word_type = builtin_type (gdbarch)->builtin_int16;
      word_asize = 'h';
      break;
    case 4:
      word_type = builtin_type (gdbarch)->builtin_int32;
      word_asize = 'w';
      break;
    case 8:
      word_type = builtin_type (gdbarch)->builtin_int64;
      word_asize = 'g';
      break;
    default:
      word_type = builtin_type (gdbarch)->builtin_int8;
      word_asize = 'b';
    }
  /* The number of rows.  */
  nr_rows = atol (argv[3]);
  if (nr_rows <= 0)
    error (_("-data-read-memory: invalid number of rows."));

  /* Number of bytes per row.  */
  nr_cols = atol (argv[4]);
  if (nr_cols <= 0)
    error (_("-data-read-memory: invalid number of columns."));

  /* The un-printable character when printing ascii.  */
  if (argc == 6)
    aschar = *argv[5];
  else
    aschar = 0;

  /* Create a buffer and read it in.  */
  total_bytes = word_size * nr_rows * nr_cols;
  mbuf = xcalloc (total_bytes, 1);
  make_cleanup (xfree, mbuf);

  /* Dispatch memory reads to the topmost target, not the flattened
     current_target.  */
  nr_bytes = target_read (current_target.beneath,
			  TARGET_OBJECT_MEMORY, NULL, mbuf,
			  addr, total_bytes);
  if (nr_bytes <= 0)
    error (_("Unable to read memory."));

  /* Output the header information.  */
  ui_out_field_core_addr (uiout, "addr", gdbarch, addr);
  ui_out_field_int (uiout, "nr-bytes", nr_bytes);
  ui_out_field_int (uiout, "total-bytes", total_bytes);
  ui_out_field_core_addr (uiout, "next-row",
			  gdbarch, addr + word_size * nr_cols);
  ui_out_field_core_addr (uiout, "prev-row",
			  gdbarch, addr - word_size * nr_cols);
  ui_out_field_core_addr (uiout, "next-page", gdbarch, addr + total_bytes);
  ui_out_field_core_addr (uiout, "prev-page", gdbarch, addr - total_bytes);

  /* Build the result as a two dimentional table.  */
  {
    struct ui_file *stream;
    struct cleanup *cleanup_stream;
    int row;
    int row_byte;

    stream = mem_fileopen ();
    cleanup_stream = make_cleanup_ui_file_delete (stream);

    make_cleanup_ui_out_list_begin_end (uiout, "memory");
    for (row = 0, row_byte = 0;
	 row < nr_rows;
	 row++, row_byte += nr_cols * word_size)
      {
	int col;
	int col_byte;
	struct cleanup *cleanup_tuple;
	struct cleanup *cleanup_list_data;
	struct value_print_options opts;

	cleanup_tuple = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
	ui_out_field_core_addr (uiout, "addr", gdbarch, addr + row_byte);
	/* ui_out_field_core_addr_symbolic (uiout, "saddr", addr +
	   row_byte); */
	cleanup_list_data = make_cleanup_ui_out_list_begin_end (uiout, "data");
	get_formatted_print_options (&opts, word_format);
	for (col = 0, col_byte = row_byte;
	     col < nr_cols;
	     col++, col_byte += word_size)
	  {
	    if (col_byte + word_size > nr_bytes)
	      {
		ui_out_field_string (uiout, NULL, "N/A");
	      }
	    else
	      {
		ui_file_rewind (stream);
		print_scalar_formatted (mbuf + col_byte, word_type, &opts,
					word_asize, stream);
		ui_out_field_stream (uiout, NULL, stream);
	      }
	  }
	do_cleanups (cleanup_list_data);
	if (aschar)
	  {
	    int byte;

	    ui_file_rewind (stream);
	    for (byte = row_byte;
		 byte < row_byte + word_size * nr_cols; byte++)
	      {
		if (byte >= nr_bytes)
		  fputc_unfiltered ('X', stream);
		else if (mbuf[byte] < 32 || mbuf[byte] > 126)
		  fputc_unfiltered (aschar, stream);
		else
		  fputc_unfiltered (mbuf[byte], stream);
	      }
	    ui_out_field_stream (uiout, "ascii", stream);
	  }
	do_cleanups (cleanup_tuple);
      }
    do_cleanups (cleanup_stream);
  }
  do_cleanups (cleanups);
}

void
mi_cmd_data_read_memory_bytes (char *command, char **argv, int argc)
{
  struct gdbarch *gdbarch = get_current_arch ();
  struct ui_out *uiout = current_uiout;
  struct cleanup *cleanups;
  CORE_ADDR addr;
  LONGEST length;
  memory_read_result_s *read_result;
  int ix;
  VEC(memory_read_result_s) *result;
  long offset = 0;
  int oind = 0;
  char *oarg;
  enum opt
  {
    OFFSET_OPT
  };
  static const struct mi_opt opts[] =
    {
      {"o", OFFSET_OPT, 1},
      { 0, 0, 0 }
    };

  while (1)
    {
      int opt = mi_getopt ("-data-read-memory-bytes", argc, argv, opts,
			   &oind, &oarg);
      if (opt < 0)
	break;
      switch ((enum opt) opt)
	{
	case OFFSET_OPT:
	  offset = atol (oarg);
	  break;
	}
    }
  argv += oind;
  argc -= oind;

  if (argc != 2)
    error (_("Usage: [ -o OFFSET ] ADDR LENGTH."));

  addr = parse_and_eval_address (argv[0]) + offset;
  length = atol (argv[1]);

  result = read_memory_robust (current_target.beneath, addr, length);

  cleanups = make_cleanup (free_memory_read_result_vector, result);

  if (VEC_length (memory_read_result_s, result) == 0)
    error (_("Unable to read memory."));

  make_cleanup_ui_out_list_begin_end (uiout, "memory");
  for (ix = 0;
       VEC_iterate (memory_read_result_s, result, ix, read_result);
       ++ix)
    {
      struct cleanup *t = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
      char *data, *p;
      int i;

      ui_out_field_core_addr (uiout, "begin", gdbarch, read_result->begin);
      ui_out_field_core_addr (uiout, "offset", gdbarch, read_result->begin
			      - addr);
      ui_out_field_core_addr (uiout, "end", gdbarch, read_result->end);

      data = xmalloc ((read_result->end - read_result->begin) * 2 + 1);

      for (i = 0, p = data;
	   i < (read_result->end - read_result->begin);
	   ++i, p += 2)
	{
	  sprintf (p, "%02x", read_result->data[i]);
	}
      ui_out_field_string (uiout, "contents", data);
      xfree (data);
      do_cleanups (t);
    }
  do_cleanups (cleanups);
}

/* Implementation of the -data-write_memory command.

   COLUMN_OFFSET: optional argument. Must be preceded by '-o'. The
   offset from the beginning of the memory grid row where the cell to
   be written is.
   ADDR: start address of the row in the memory grid where the memory
   cell is, if OFFSET_COLUMN is specified.  Otherwise, the address of
   the location to write to.
   FORMAT: a char indicating format for the ``word''.  See 
   the ``x'' command.
   WORD_SIZE: size of each ``word''; 1,2,4, or 8 bytes
   VALUE: value to be written into the memory address.

   Writes VALUE into ADDR + (COLUMN_OFFSET * WORD_SIZE).

   Prints nothing.  */

void
mi_cmd_data_write_memory (char *command, char **argv, int argc)
{
  struct gdbarch *gdbarch = get_current_arch ();
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR addr;
  char word_format;
  long word_size;
  /* FIXME: ezannoni 2000-02-17 LONGEST could possibly not be big
     enough when using a compiler other than GCC.  */
  LONGEST value;
  void *buffer;
  struct cleanup *old_chain;
  long offset = 0;
  int oind = 0;
  char *oarg;
  enum opt
  {
    OFFSET_OPT
  };
  static const struct mi_opt opts[] =
    {
      {"o", OFFSET_OPT, 1},
      { 0, 0, 0 }
    };

  while (1)
    {
      int opt = mi_getopt ("-data-write-memory", argc, argv, opts,
			   &oind, &oarg);

      if (opt < 0)
	break;
      switch ((enum opt) opt)
	{
	case OFFSET_OPT:
	  offset = atol (oarg);
	  break;
	}
    }
  argv += oind;
  argc -= oind;

  if (argc != 4)
    error (_("-data-write-memory: Usage: "
	     "[-o COLUMN_OFFSET] ADDR FORMAT WORD-SIZE VALUE."));

  /* Extract all the arguments.  */
  /* Start address of the memory dump.  */
  addr = parse_and_eval_address (argv[0]);
  /* The format character to use when displaying a memory word.  See
     the ``x'' command.  */
  word_format = argv[1][0];
  /* The size of the memory word.  */
  word_size = atol (argv[2]);

  /* Calculate the real address of the write destination.  */
  addr += (offset * word_size);

  /* Get the value as a number.  */
  value = parse_and_eval_address (argv[3]);
  /* Get the value into an array.  */
  buffer = xmalloc (word_size);
  old_chain = make_cleanup (xfree, buffer);
  store_signed_integer (buffer, word_size, byte_order, value);
  /* Write it down to memory.  */
  write_memory_with_notification (addr, buffer, word_size);
  /* Free the buffer.  */
  do_cleanups (old_chain);
}

/* Implementation of the -data-write-memory-bytes command.

   ADDR: start address
   DATA: string of bytes to write at that address.  */

void
mi_cmd_data_write_memory_bytes (char *command, char **argv, int argc)
{
  CORE_ADDR addr;
  char *cdata;
  gdb_byte *data;
  int len, r, i;
  struct cleanup *back_to;

  if (argc != 2)
    error (_("Usage: ADDR DATA."));

  addr = parse_and_eval_address (argv[0]);
  cdata = argv[1];
  if (strlen (cdata) % 2)
    error (_("Hex-encoded '%s' must have an even number of characters."),
	   cdata);

  len = strlen (cdata)/2;

  data = xmalloc (len);
  back_to = make_cleanup (xfree, data);

  for (i = 0; i < len; ++i)
    {
      int x;
      sscanf (cdata + i * 2, "%02x", &x);
      data[i] = (gdb_byte) x;
    }

  write_memory_with_notification (addr, data, len);

  do_cleanups (back_to);
}

void
mi_cmd_enable_timings (char *command, char **argv, int argc)
{
  if (argc == 0)
    do_timings = 1;
  else if (argc == 1)
    {
      if (strcmp (argv[0], "yes") == 0)
	do_timings = 1;
      else if (strcmp (argv[0], "no") == 0)
	do_timings = 0;
      else
	goto usage_error;
    }
  else
    goto usage_error;
    
  return;

 usage_error:
  error (_("-enable-timings: Usage: %s {yes|no}"), command);
}

void
mi_cmd_list_features (char *command, char **argv, int argc)
{
  if (argc == 0)
    {
      struct cleanup *cleanup = NULL;
      struct ui_out *uiout = current_uiout;

      cleanup = make_cleanup_ui_out_list_begin_end (uiout, "features");      
      ui_out_field_string (uiout, NULL, "frozen-varobjs");
      ui_out_field_string (uiout, NULL, "pending-breakpoints");
      ui_out_field_string (uiout, NULL, "thread-info");
      ui_out_field_string (uiout, NULL, "data-read-memory-bytes");
      ui_out_field_string (uiout, NULL, "breakpoint-notifications");
      ui_out_field_string (uiout, NULL, "ada-task-info");
      
#if HAVE_PYTHON
      ui_out_field_string (uiout, NULL, "python");
#endif
      
      do_cleanups (cleanup);
      return;
    }

  error (_("-list-features should be passed no arguments"));
}

void
mi_cmd_list_target_features (char *command, char **argv, int argc)
{
  if (argc == 0)
    {
      struct cleanup *cleanup = NULL;
      struct ui_out *uiout = current_uiout;

      cleanup = make_cleanup_ui_out_list_begin_end (uiout, "features");      
      if (target_can_async_p ())
	ui_out_field_string (uiout, NULL, "async");
      if (target_can_execute_reverse)
	ui_out_field_string (uiout, NULL, "reverse");
      
      do_cleanups (cleanup);
      return;
    }

  error (_("-list-target-features should be passed no arguments"));
}

void
mi_cmd_add_inferior (char *command, char **argv, int argc)
{
  struct inferior *inf;

  if (argc != 0)
    error (_("-add-inferior should be passed no arguments"));

  inf = add_inferior_with_spaces ();

  ui_out_field_fmt (current_uiout, "inferior", "i%d", inf->num);
}

/* Callback used to find the first inferior other than the current
   one.  */
   
static int
get_other_inferior (struct inferior *inf, void *arg)
{
  if (inf == current_inferior ())
    return 0;

  return 1;
}

void
mi_cmd_remove_inferior (char *command, char **argv, int argc)
{
  int id;
  struct inferior *inf;

  if (argc != 1)
    error (_("-remove-inferior should be passed a single argument"));

  if (sscanf (argv[0], "i%d", &id) != 1)
    error (_("the thread group id is syntactically invalid"));

  inf = find_inferior_id (id);
  if (!inf)
    error (_("the specified thread group does not exist"));

  if (inf->pid != 0)
    error (_("cannot remove an active inferior"));

  if (inf == current_inferior ())
    {
      struct thread_info *tp = 0;
      struct inferior *new_inferior 
	= iterate_over_inferiors (get_other_inferior, NULL);

      if (new_inferior == NULL)
	error (_("Cannot remove last inferior"));

      set_current_inferior (new_inferior);
      if (new_inferior->pid != 0)
	tp = any_thread_of_process (new_inferior->pid);
      switch_to_thread (tp ? tp->ptid : null_ptid);
      set_current_program_space (new_inferior->pspace);
    }

  delete_inferior_1 (inf, 1 /* silent */);
}


/* Execute a command within a safe environment.
   Return <0 for error; >=0 for ok.

   args->action will tell mi_execute_command what action
   to perfrom after the given command has executed (display/suppress
   prompt, display error).  */

static void
captured_mi_execute_command (struct ui_out *uiout, struct mi_parse *context)
{
  struct cleanup *cleanup;

  if (do_timings)
    current_command_ts = context->cmd_start;

  current_token = xstrdup (context->token);
  cleanup = make_cleanup (free_current_contents, &current_token);

  running_result_record_printed = 0;
  mi_proceeded = 0;
  switch (context->op)
    {
    case MI_COMMAND:
      /* A MI command was read from the input stream.  */
      if (mi_debug_p)
	/* FIXME: gdb_???? */
	fprintf_unfiltered (raw_stdout, " token=`%s' command=`%s' args=`%s'\n",
			    context->token, context->command, context->args);

      mi_cmd_execute (context);

      /* Print the result if there were no errors.

	 Remember that on the way out of executing a command, you have
	 to directly use the mi_interp's uiout, since the command
	 could have reset the interpreter, in which case the current
	 uiout will most likely crash in the mi_out_* routines.  */
      if (!running_result_record_printed)
	{
	  fputs_unfiltered (context->token, raw_stdout);
	  /* There's no particularly good reason why target-connect results
	     in not ^done.  Should kill ^connected for MI3.  */
	  fputs_unfiltered (strcmp (context->command, "target-select") == 0
			    ? "^connected" : "^done", raw_stdout);
	  mi_out_put (uiout, raw_stdout);
	  mi_out_rewind (uiout);
	  mi_print_timing_maybe ();
	  fputs_unfiltered ("\n", raw_stdout);
	}
      else
	/* The command does not want anything to be printed.  In that
	   case, the command probably should not have written anything
	   to uiout, but in case it has written something, discard it.  */
	mi_out_rewind (uiout);
      break;

    case CLI_COMMAND:
      {
	char *argv[2];

	/* A CLI command was read from the input stream.  */
	/* This "feature" will be removed as soon as we have a
	   complete set of mi commands.  */
	/* Echo the command on the console.  */
	fprintf_unfiltered (gdb_stdlog, "%s\n", context->command);
	/* Call the "console" interpreter.  */
	argv[0] = "console";
	argv[1] = context->command;
	mi_cmd_interpreter_exec ("-interpreter-exec", argv, 2);

	/* If we changed interpreters, DON'T print out anything.  */
	if (current_interp_named_p (INTERP_MI)
	    || current_interp_named_p (INTERP_MI1)
	    || current_interp_named_p (INTERP_MI2)
	    || current_interp_named_p (INTERP_MI3))
	  {
	    if (!running_result_record_printed)
	      {
		fputs_unfiltered (context->token, raw_stdout);
		fputs_unfiltered ("^done", raw_stdout);
		mi_out_put (uiout, raw_stdout);
		mi_out_rewind (uiout);
		mi_print_timing_maybe ();
		fputs_unfiltered ("\n", raw_stdout);		
	      }
	    else
	      mi_out_rewind (uiout);
	  }
	break;
      }
    }

  do_cleanups (cleanup);
}

/* Print a gdb exception to the MI output stream.  */

static void
mi_print_exception (const char *token, struct gdb_exception exception)
{
  fputs_unfiltered (token, raw_stdout);
  fputs_unfiltered ("^error,msg=\"", raw_stdout);
  if (exception.message == NULL)
    fputs_unfiltered ("unknown error", raw_stdout);
  else
    fputstr_unfiltered (exception.message, '"', raw_stdout);
  fputs_unfiltered ("\"\n", raw_stdout);
}

void
mi_execute_command (char *cmd, int from_tty)
{
  char *token;
  struct mi_parse *command = NULL;
  volatile struct gdb_exception exception;

  /* This is to handle EOF (^D). We just quit gdb.  */
  /* FIXME: we should call some API function here.  */
  if (cmd == 0)
    quit_force (NULL, from_tty);

  target_log_command (cmd);

  TRY_CATCH (exception, RETURN_MASK_ALL)
    {
      command = mi_parse (cmd, &token);
    }
  if (exception.reason < 0)
    {
      mi_print_exception (token, exception);
      xfree (token);
    }
  else
    {
      volatile struct gdb_exception result;
      ptid_t previous_ptid = inferior_ptid;

      command->token = token;

      if (do_timings)
	{
	  command->cmd_start = (struct mi_timestamp *)
	    xmalloc (sizeof (struct mi_timestamp));
	  timestamp (command->cmd_start);
	}

      TRY_CATCH (result, RETURN_MASK_ALL)
	{
	  captured_mi_execute_command (current_uiout, command);
	}
      if (result.reason < 0)
	{
	  /* The command execution failed and error() was called
	     somewhere.  */
	  mi_print_exception (command->token, result);
	  mi_out_rewind (current_uiout);
	}

      bpstat_do_actions ();

      if (/* The notifications are only output when the top-level
	     interpreter (specified on the command line) is MI.  */      
	  ui_out_is_mi_like_p (interp_ui_out (top_level_interpreter ()))
	  /* Don't try report anything if there are no threads -- 
	     the program is dead.  */
	  && thread_count () != 0
	  /* -thread-select explicitly changes thread. If frontend uses that
	     internally, we don't want to emit =thread-selected, since
	     =thread-selected is supposed to indicate user's intentions.  */
	  && strcmp (command->command, "thread-select") != 0)
	{
	  struct mi_interp *mi = top_level_interpreter_data ();
	  int report_change = 0;

	  if (command->thread == -1)
	    {
	      report_change = (!ptid_equal (previous_ptid, null_ptid)
			       && !ptid_equal (inferior_ptid, previous_ptid)
			       && !ptid_equal (inferior_ptid, null_ptid));
	    }
	  else if (!ptid_equal (inferior_ptid, null_ptid))
	    {
	      struct thread_info *ti = inferior_thread ();

	      report_change = (ti->num != command->thread);
	    }

	  if (report_change)
	    {     
	      struct thread_info *ti = inferior_thread ();

	      target_terminal_ours ();
	      fprintf_unfiltered (mi->event_channel, 
				  "thread-selected,id=\"%d\"",
				  ti->num);
	      gdb_flush (mi->event_channel);
	    }
	}

      mi_parse_free (command);
    }
}

static void
mi_cmd_execute (struct mi_parse *parse)
{
  struct cleanup *cleanup;

  cleanup = prepare_execute_command ();

  if (parse->all && parse->thread_group != -1)
    error (_("Cannot specify --thread-group together with --all"));

  if (parse->all && parse->thread != -1)
    error (_("Cannot specify --thread together with --all"));

  if (parse->thread_group != -1 && parse->thread != -1)
    error (_("Cannot specify --thread together with --thread-group"));

  if (parse->frame != -1 && parse->thread == -1)
    error (_("Cannot specify --frame without --thread"));

  if (parse->thread_group != -1)
    {
      struct inferior *inf = find_inferior_id (parse->thread_group);
      struct thread_info *tp = 0;

      if (!inf)
	error (_("Invalid thread group for the --thread-group option"));

      set_current_inferior (inf);
      /* This behaviour means that if --thread-group option identifies
	 an inferior with multiple threads, then a random one will be
	 picked.  This is not a problem -- frontend should always
	 provide --thread if it wishes to operate on a specific
	 thread.  */
      if (inf->pid != 0)
	tp = any_live_thread_of_process (inf->pid);
      switch_to_thread (tp ? tp->ptid : null_ptid);
      set_current_program_space (inf->pspace);
    }

  if (parse->thread != -1)
    {
      struct thread_info *tp = find_thread_id (parse->thread);

      if (!tp)
	error (_("Invalid thread id: %d"), parse->thread);

      if (is_exited (tp->ptid))
	error (_("Thread id: %d has terminated"), parse->thread);

      switch_to_thread (tp->ptid);
    }

  if (parse->frame != -1)
    {
      struct frame_info *fid;
      int frame = parse->frame;

      fid = find_relative_frame (get_current_frame (), &frame);
      if (frame == 0)
	/* find_relative_frame was successful */
	select_frame (fid);
      else
	error (_("Invalid frame id: %d"), frame);
    }

  current_context = parse;

  if (parse->cmd->suppress_notification != NULL)
    {
      make_cleanup_restore_integer (parse->cmd->suppress_notification);
      *parse->cmd->suppress_notification = 1;
    }

  if (parse->cmd->argv_func != NULL)
    {
      parse->cmd->argv_func (parse->command, parse->argv, parse->argc);
    }
  else if (parse->cmd->cli.cmd != 0)
    {
      /* FIXME: DELETE THIS. */
      /* The operation is still implemented by a cli command.  */
      /* Must be a synchronous one.  */
      mi_execute_cli_command (parse->cmd->cli.cmd, parse->cmd->cli.args_p,
			      parse->args);
    }
  else
    {
      /* FIXME: DELETE THIS.  */
      struct ui_file *stb;

      stb = mem_fileopen ();

      fputs_unfiltered ("Undefined mi command: ", stb);
      fputstr_unfiltered (parse->command, '"', stb);
      fputs_unfiltered (" (missing implementation)", stb);

      make_cleanup_ui_file_delete (stb);
      error_stream (stb);
    }
  do_cleanups (cleanup);
}

/* FIXME: This is just a hack so we can get some extra commands going.
   We don't want to channel things through the CLI, but call libgdb directly.
   Use only for synchronous commands.  */

void
mi_execute_cli_command (const char *cmd, int args_p, const char *args)
{
  if (cmd != 0)
    {
      struct cleanup *old_cleanups;
      char *run;

      if (args_p)
	run = xstrprintf ("%s %s", cmd, args);
      else
	run = xstrdup (cmd);
      if (mi_debug_p)
	/* FIXME: gdb_???? */
	fprintf_unfiltered (gdb_stdout, "cli=%s run=%s\n",
			    cmd, run);
      old_cleanups = make_cleanup (xfree, run);
      execute_command (run, 0 /* from_tty */ );
      do_cleanups (old_cleanups);
      return;
    }
}

void
mi_execute_async_cli_command (char *cli_command, char **argv, int argc)
{
  struct cleanup *old_cleanups;
  char *run;

  if (target_can_async_p ())
    run = xstrprintf ("%s %s&", cli_command, argc ? *argv : "");
  else
    run = xstrprintf ("%s %s", cli_command, argc ? *argv : "");
  old_cleanups = make_cleanup (xfree, run);  

  execute_command (run, 0 /* from_tty */ );

  /* Do this before doing any printing.  It would appear that some
     print code leaves garbage around in the buffer.  */
  do_cleanups (old_cleanups);
}

void
mi_load_progress (const char *section_name,
		  unsigned long sent_so_far,
		  unsigned long total_section,
		  unsigned long total_sent,
		  unsigned long grand_total)
{
  struct timeval time_now, delta, update_threshold;
  static struct timeval last_update;
  static char *previous_sect_name = NULL;
  int new_section;
  struct ui_out *saved_uiout;
  struct ui_out *uiout;

  /* This function is called through deprecated_show_load_progress
     which means uiout may not be correct.  Fix it for the duration
     of this function.  */
  saved_uiout = current_uiout;

  if (current_interp_named_p (INTERP_MI)
      || current_interp_named_p (INTERP_MI2))
    current_uiout = mi_out_new (2);
  else if (current_interp_named_p (INTERP_MI1))
    current_uiout = mi_out_new (1);
  else if (current_interp_named_p (INTERP_MI3))
    current_uiout = mi_out_new (3);
  else
    return;

  uiout = current_uiout;

  update_threshold.tv_sec = 0;
  update_threshold.tv_usec = 500000;
  gettimeofday (&time_now, NULL);

  delta.tv_usec = time_now.tv_usec - last_update.tv_usec;
  delta.tv_sec = time_now.tv_sec - last_update.tv_sec;

  if (delta.tv_usec < 0)
    {
      delta.tv_sec -= 1;
      delta.tv_usec += 1000000L;
    }

  new_section = (previous_sect_name ?
		 strcmp (previous_sect_name, section_name) : 1);
  if (new_section)
    {
      struct cleanup *cleanup_tuple;

      xfree (previous_sect_name);
      previous_sect_name = xstrdup (section_name);

      if (current_token)
	fputs_unfiltered (current_token, raw_stdout);
      fputs_unfiltered ("+download", raw_stdout);
      cleanup_tuple = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
      ui_out_field_string (uiout, "section", section_name);
      ui_out_field_int (uiout, "section-size", total_section);
      ui_out_field_int (uiout, "total-size", grand_total);
      do_cleanups (cleanup_tuple);
      mi_out_put (uiout, raw_stdout);
      fputs_unfiltered ("\n", raw_stdout);
      gdb_flush (raw_stdout);
    }

  if (delta.tv_sec >= update_threshold.tv_sec &&
      delta.tv_usec >= update_threshold.tv_usec)
    {
      struct cleanup *cleanup_tuple;

      last_update.tv_sec = time_now.tv_sec;
      last_update.tv_usec = time_now.tv_usec;
      if (current_token)
	fputs_unfiltered (current_token, raw_stdout);
      fputs_unfiltered ("+download", raw_stdout);
      cleanup_tuple = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
      ui_out_field_string (uiout, "section", section_name);
      ui_out_field_int (uiout, "section-sent", sent_so_far);
      ui_out_field_int (uiout, "section-size", total_section);
      ui_out_field_int (uiout, "total-sent", total_sent);
      ui_out_field_int (uiout, "total-size", grand_total);
      do_cleanups (cleanup_tuple);
      mi_out_put (uiout, raw_stdout);
      fputs_unfiltered ("\n", raw_stdout);
      gdb_flush (raw_stdout);
    }

  xfree (uiout);
  current_uiout = saved_uiout;
}

static void 
timestamp (struct mi_timestamp *tv)
{
  gettimeofday (&tv->wallclock, NULL);
#ifdef HAVE_GETRUSAGE
  getrusage (RUSAGE_SELF, &rusage);
  tv->utime.tv_sec = rusage.ru_utime.tv_sec;
  tv->utime.tv_usec = rusage.ru_utime.tv_usec;
  tv->stime.tv_sec = rusage.ru_stime.tv_sec;
  tv->stime.tv_usec = rusage.ru_stime.tv_usec;
#else
  {
    long usec = get_run_time ();

    tv->utime.tv_sec = usec/1000000L;
    tv->utime.tv_usec = usec - 1000000L*tv->utime.tv_sec;
    tv->stime.tv_sec = 0;
    tv->stime.tv_usec = 0;
  }
#endif
}

static void 
print_diff_now (struct mi_timestamp *start)
{
  struct mi_timestamp now;

  timestamp (&now);
  print_diff (start, &now);
}

void
mi_print_timing_maybe (void)
{
  /* If the command is -enable-timing then do_timings may be true
     whilst current_command_ts is not initialized.  */
  if (do_timings && current_command_ts)
    print_diff_now (current_command_ts);
}

static long 
timeval_diff (struct timeval start, struct timeval end)
{
  return ((end.tv_sec - start.tv_sec) * 1000000L)
    + (end.tv_usec - start.tv_usec);
}

static void 
print_diff (struct mi_timestamp *start, struct mi_timestamp *end)
{
  fprintf_unfiltered
    (raw_stdout,
     ",time={wallclock=\"%0.5f\",user=\"%0.5f\",system=\"%0.5f\"}", 
     timeval_diff (start->wallclock, end->wallclock) / 1000000.0, 
     timeval_diff (start->utime, end->utime) / 1000000.0, 
     timeval_diff (start->stime, end->stime) / 1000000.0);
}

void
mi_cmd_trace_define_variable (char *command, char **argv, int argc)
{
  struct expression *expr;
  struct cleanup *back_to;
  LONGEST initval = 0;
  struct trace_state_variable *tsv;
  char *name = 0;

  if (argc != 1 && argc != 2)
    error (_("Usage: -trace-define-variable VARIABLE [VALUE]"));

  expr = parse_expression (argv[0]);
  back_to = make_cleanup (xfree, expr);

  if (expr->nelts == 3 && expr->elts[0].opcode == OP_INTERNALVAR)
    {
      struct internalvar *intvar = expr->elts[1].internalvar;

      if (intvar)
	name = internalvar_name (intvar);
    }

  if (!name || *name == '\0')
    error (_("Invalid name of trace variable"));

  tsv = find_trace_state_variable (name);
  if (!tsv)
    tsv = create_trace_state_variable (name);

  if (argc == 2)
    initval = value_as_long (parse_and_eval (argv[1]));

  tsv->initial_value = initval;

  do_cleanups (back_to);
}

void
mi_cmd_trace_list_variables (char *command, char **argv, int argc)
{
  if (argc != 0)
    error (_("-trace-list-variables: no arguments allowed"));

  tvariables_info_1 ();
}

void
mi_cmd_trace_find (char *command, char **argv, int argc)
{
  char *mode;

  if (argc == 0)
    error (_("trace selection mode is required"));

  mode = argv[0];

  if (strcmp (mode, "none") == 0)
    {
      tfind_1 (tfind_number, -1, 0, 0, 0);
      return;
    }

  if (current_trace_status ()->running)
    error (_("May not look at trace frames while trace is running."));

  if (strcmp (mode, "frame-number") == 0)
    {
      if (argc != 2)
	error (_("frame number is required"));
      tfind_1 (tfind_number, atoi (argv[1]), 0, 0, 0);
    }
  else if (strcmp (mode, "tracepoint-number") == 0)
    {
      if (argc != 2)
	error (_("tracepoint number is required"));
      tfind_1 (tfind_tp, atoi (argv[1]), 0, 0, 0);
    }
  else if (strcmp (mode, "pc") == 0)
    {
      if (argc != 2)
	error (_("PC is required"));
      tfind_1 (tfind_pc, 0, parse_and_eval_address (argv[1]), 0, 0);
    }
  else if (strcmp (mode, "pc-inside-range") == 0)
    {
      if (argc != 3)
	error (_("Start and end PC are required"));
      tfind_1 (tfind_range, 0, parse_and_eval_address (argv[1]),
	       parse_and_eval_address (argv[2]), 0);
    }
  else if (strcmp (mode, "pc-outside-range") == 0)
    {
      if (argc != 3)
	error (_("Start and end PC are required"));
      tfind_1 (tfind_outside, 0, parse_and_eval_address (argv[1]),
	       parse_and_eval_address (argv[2]), 0);
    }
  else if (strcmp (mode, "line") == 0)
    {
      struct symtabs_and_lines sals;
      struct symtab_and_line sal;
      static CORE_ADDR start_pc, end_pc;
      struct cleanup *back_to;

      if (argc != 2)
	error (_("Line is required"));

      sals = decode_line_with_current_source (argv[1],
					      DECODE_LINE_FUNFIRSTLINE);
      back_to = make_cleanup (xfree, sals.sals);

      sal = sals.sals[0];

      if (sal.symtab == 0)
	error (_("Could not find the specified line"));

      if (sal.line > 0 && find_line_pc_range (sal, &start_pc, &end_pc))
	tfind_1 (tfind_range, 0, start_pc, end_pc - 1, 0);
      else
	error (_("Could not find the specified line"));

      do_cleanups (back_to);
    }
  else
    error (_("Invalid mode '%s'"), mode);

  if (has_stack_frames () || get_traceframe_number () >= 0)
    print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
}

void
mi_cmd_trace_save (char *command, char **argv, int argc)
{
  int target_saves = 0;
  char *filename;

  if (argc != 1 && argc != 2)
    error (_("Usage: -trace-save [-r] filename"));

  if (argc == 2)
    {
      filename = argv[1];
      if (strcmp (argv[0], "-r") == 0)
	target_saves = 1;
      else
	error (_("Invalid option: %s"), argv[0]);
    }
  else
    {
      filename = argv[0];
    }

  trace_save (filename, target_saves);
}

void
mi_cmd_trace_start (char *command, char **argv, int argc)
{
  start_tracing (NULL);
}

void
mi_cmd_trace_status (char *command, char **argv, int argc)
{
  trace_status_mi (0);
}

void
mi_cmd_trace_stop (char *command, char **argv, int argc)
{
  stop_tracing (NULL);
  trace_status_mi (1);
}

/* Implement the "-ada-task-info" command.  */

void
mi_cmd_ada_task_info (char *command, char **argv, int argc)
{
  if (argc != 0 && argc != 1)
    error (_("Invalid MI command"));

  print_ada_task_info (current_uiout, argv[0], current_inferior ());
}