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/* MI Interpreter Definitions and Commands for GDB, the GNU debugger.

   Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "gdb_string.h"

#include "interps.h"

#include "event-top.h"

#include "event-loop.h"

#include "inferior.h"

#include "ui-out.h"

#include "top.h"

#include "exceptions.h"

#include "mi-main.h"

#include "mi-cmds.h"

#include "mi-out.h"

#include "mi-console.h"

#include "mi-common.h"

#include "observer.h"

#include "gdbthread.h"

#include "solist.h"

/* These are the interpreter setup, etc. functions for the MI interpreter */

static void mi_execute_command_wrapper (char *cmd);

static void mi_command_loop (int mi_version);

/* These are hooks that we put in place while doing interpreter_exec

   so we can report interesting things that happened "behind the mi's

   back" in this command */

static int mi_interp_query_hook (const char *ctlstr, va_list ap)

     ATTR_FORMAT (printf, 1, 0);

static void mi3_command_loop (void);

static void mi2_command_loop (void);

static void mi1_command_loop (void);

static void mi_insert_notify_hooks (void);

static void mi_remove_notify_hooks (void);

static void mi_on_normal_stop (struct bpstats *bs, int print_frame);

static void mi_new_thread (struct thread_info *t);

static void mi_thread_exit (struct thread_info *t, int silent);

static void mi_inferior_appeared (int pid);

static void mi_inferior_exit (int pid);

static void mi_on_resume (ptid_t ptid);

static void mi_solib_loaded (struct so_list *solib);

static void mi_solib_unloaded (struct so_list *solib);

static void mi_about_to_proceed (void);

static void *

mi_interpreter_init (int top_level)

{

  struct mi_interp *mi = XMALLOC (struct mi_interp);

  /* HACK: We need to force stdout/stderr to point at the console.  This avoids

     any potential side effects caused by legacy code that is still

     using the TUI / fputs_unfiltered_hook.  So we set up output channels for

     this now, and swap them in when we are run. */

  raw_stdout = stdio_fileopen (stdout);

  /* Create MI channels */

  mi->out = mi_console_file_new (raw_stdout, "~", '"');

  mi->err = mi_console_file_new (raw_stdout, "&", '"');

  mi->log = mi->err;

  mi->targ = mi_console_file_new (raw_stdout, "@", '"');

  mi->event_channel = mi_console_file_new (raw_stdout, "=", 0);

  if (top_level)

    {

      observer_attach_new_thread (mi_new_thread);

      observer_attach_thread_exit (mi_thread_exit);

      observer_attach_inferior_appeared (mi_inferior_appeared);

      observer_attach_inferior_exit (mi_inferior_exit);

      observer_attach_normal_stop (mi_on_normal_stop);

      observer_attach_target_resumed (mi_on_resume);

      observer_attach_solib_loaded (mi_solib_loaded);

      observer_attach_solib_unloaded (mi_solib_unloaded);

      observer_attach_about_to_proceed (mi_about_to_proceed);

    }

  return mi;

}

static int

mi_interpreter_resume (void *data)

{

  struct mi_interp *mi = data;

  /* As per hack note in mi_interpreter_init, swap in the output channels... */

  gdb_setup_readline ();

  /* These overwrite some of the initialization done in

     _intialize_event_loop.  */

  call_readline = gdb_readline2;

  input_handler = mi_execute_command_wrapper;

  add_file_handler (input_fd, stdin_event_handler, 0);

  async_command_editing_p = 0;

  /* FIXME: This is a total hack for now.  PB's use of the MI

     implicitly relies on a bug in the async support which allows

     asynchronous commands to leak through the commmand loop.  The bug

     involves (but is not limited to) the fact that sync_execution was

     erroneously initialized to 0.  Duplicate by initializing it thus

     here...  */

  sync_execution = 0;

  gdb_stdout = mi->out;

  /* Route error and log output through the MI */

  gdb_stderr = mi->err;

  gdb_stdlog = mi->log;

  /* Route target output through the MI. */

  gdb_stdtarg = mi->targ;

  /* Route target error through the MI as well. */

  gdb_stdtargerr = mi->targ;

  /* Replace all the hooks that we know about.  There really needs to

     be a better way of doing this... */

  clear_interpreter_hooks ();

  deprecated_show_load_progress = mi_load_progress;

  /* If we're _the_ interpreter, take control. */

  if (current_interp_named_p (INTERP_MI1))

    deprecated_command_loop_hook = mi1_command_loop;

  else if (current_interp_named_p (INTERP_MI2))

    deprecated_command_loop_hook = mi2_command_loop;

  else if (current_interp_named_p (INTERP_MI3))

    deprecated_command_loop_hook = mi3_command_loop;

  else

    deprecated_command_loop_hook = mi2_command_loop;

  return 1;

}

static int

mi_interpreter_suspend (void *data)

{

  gdb_disable_readline ();

  return 1;

}

static struct gdb_exception

mi_interpreter_exec (void *data, const char *command)

{

  static struct gdb_exception ok;

  char *tmp = alloca (strlen (command) + 1);

  strcpy (tmp, command);

  mi_execute_command_wrapper (tmp);

  return exception_none;

}

/* Never display the default gdb prompt in mi case.  */

static int

mi_interpreter_prompt_p (void *data)

{

  return 0;

}

void

mi_cmd_interpreter_exec (char *command, char **argv, int argc)

{

  struct interp *interp_to_use;

  int i;

  struct interp_procs *procs;

  char *mi_error_message = NULL;

  struct cleanup *old_chain;

  if (argc < 2)

    error ("mi_cmd_interpreter_exec: Usage: -interpreter-exec interp command");

  interp_to_use = interp_lookup (argv[0]);

  if (interp_to_use == NULL)

    error ("mi_cmd_interpreter_exec: could not find interpreter \"%s\"", argv[0]);

  if (!interp_exec_p (interp_to_use))

    error ("mi_cmd_interpreter_exec: interpreter \"%s\" does not support command execution",

              argv[0]);

  /* Insert the MI out hooks, making sure to also call the interpreter's hooks

     if it has any. */

  /* KRS: We shouldn't need this... Events should be installed and they should

     just ALWAYS fire something out down the MI channel... */

  mi_insert_notify_hooks ();

  /* Now run the code... */

  old_chain = make_cleanup (null_cleanup, 0);

  for (i = 1; i < argc; i++)

    {

      struct gdb_exception e = interp_exec (interp_to_use, argv[i]);

      if (e.reason < 0)

        {

          mi_error_message = xstrdup (e.message);

          make_cleanup (xfree, mi_error_message);

          break;

        }

    }

  mi_remove_notify_hooks ();

  if (mi_error_message != NULL)

    error ("%s", mi_error_message);

  do_cleanups (old_chain);

}

/*

 * mi_insert_notify_hooks - This inserts a number of hooks that are meant to produce

 * async-notify ("=") MI messages while running commands in another interpreter

 * using mi_interpreter_exec.  The canonical use for this is to allow access to

 * the gdb CLI interpreter from within the MI, while still producing MI style output

 * when actions in the CLI command change gdb's state.

*/

static void

mi_insert_notify_hooks (void)

{

  deprecated_query_hook = mi_interp_query_hook;

}

static void

mi_remove_notify_hooks (void)

{

  deprecated_query_hook = NULL;

}

static int

mi_interp_query_hook (const char *ctlstr, va_list ap)

{

  return 1;

}

static void

mi_execute_command_wrapper (char *cmd)

{

  mi_execute_command (cmd, stdin == instream);

}

static void

mi1_command_loop (void)

{

  mi_command_loop (1);

}

static void

mi2_command_loop (void)

{

  mi_command_loop (2);

}

static void

mi3_command_loop (void)

{

  mi_command_loop (3);

}

static void

mi_command_loop (int mi_version)

{

  /* Turn off 8 bit strings in quoted output.  Any character with the

     high bit set is printed using C's octal format. */

  sevenbit_strings = 1;

  /* Tell the world that we're alive */

  fputs_unfiltered ("(gdb) \n", raw_stdout);

  gdb_flush (raw_stdout);

  start_event_loop ();

}

static void

mi_new_thread (struct thread_info *t)

{

  struct mi_interp *mi = top_level_interpreter_data ();

  fprintf_unfiltered (mi->event_channel,

                      "thread-created,id=\"%d\",group-id=\"%d\"",

                      t->num, t->ptid.pid);

  gdb_flush (mi->event_channel);

}

static void

mi_thread_exit (struct thread_info *t, int silent)

{

  struct mi_interp *mi;

  if (silent)

    return;

  mi = top_level_interpreter_data ();

  target_terminal_ours ();

  fprintf_unfiltered (mi->event_channel,

                      "thread-exited,id=\"%d\",group-id=\"%d\"",

                      t->num,t->ptid.pid);

  gdb_flush (mi->event_channel);

}

void

mi_inferior_appeared (int pid)

{

  struct mi_interp *mi = top_level_interpreter_data ();

  target_terminal_ours ();

  fprintf_unfiltered (mi->event_channel, "thread-group-created,id=\"%d\"",

                      pid);

  gdb_flush (mi->event_channel);

}

static void

mi_inferior_exit (int pid)

{

  struct mi_interp *mi = top_level_interpreter_data ();

  target_terminal_ours ();

  fprintf_unfiltered (mi->event_channel, "thread-group-exited,id=\"%d\"",

                      pid);

  gdb_flush (mi->event_channel);

}

static void

mi_on_normal_stop (struct bpstats *bs, int print_frame)

{

  /* Since this can be called when CLI command is executing,

     using cli interpreter, be sure to use MI uiout for output,

     not the current one.  */

  struct ui_out *mi_uiout = interp_ui_out (top_level_interpreter ());

  struct mi_interp *mi = top_level_interpreter_data ();

  if (print_frame)

    {

      int core;

      if (uiout != mi_uiout)

        {

          /* The normal_stop function has printed frame information into

             CLI uiout, or some other non-MI uiout.  There's no way we

             can extract proper fields from random uiout object, so we print

             the frame again.  In practice, this can only happen when running

             a CLI command in MI.  */

          struct ui_out *saved_uiout = uiout;

          uiout = mi_uiout;

          print_stack_frame (get_selected_frame (NULL), 0, SRC_AND_LOC);

          uiout = saved_uiout;

        }

      ui_out_field_int (mi_uiout, "thread-id",

                        pid_to_thread_id (inferior_ptid));

      if (non_stop)

        {

          struct cleanup *back_to = make_cleanup_ui_out_list_begin_end

            (mi_uiout, "stopped-threads");

          ui_out_field_int (mi_uiout, NULL,

                            pid_to_thread_id (inferior_ptid));

          do_cleanups (back_to);

        }

      else

        ui_out_field_string (mi_uiout, "stopped-threads", "all");

      core = target_core_of_thread (inferior_ptid);

      if (core != -1)

        ui_out_field_int (mi_uiout, "core", core);

    }

  fputs_unfiltered ("*stopped", raw_stdout);

  mi_out_put (mi_uiout, raw_stdout);

  mi_out_rewind (mi_uiout);

  mi_print_timing_maybe ();

  fputs_unfiltered ("\n", raw_stdout);

  gdb_flush (raw_stdout);

}

static void

mi_about_to_proceed (void)

{

  /* Suppress output while calling an inferior function.  */

  if (!ptid_equal (inferior_ptid, null_ptid))

    {

      struct thread_info *tp = inferior_thread ();

      if (tp->in_infcall)

        return;

    }

  mi_proceeded = 1;

}

static int

mi_output_running_pid (struct thread_info *info, void *arg)

{

  ptid_t *ptid = arg;

  if (ptid_get_pid (*ptid) == ptid_get_pid (info->ptid))

    fprintf_unfiltered (raw_stdout,

                        "*running,thread-id=\"%d\"\n",

                        info->num);

  return 0;

}

static int

mi_inferior_count (struct inferior *inf, void *arg)

{

  if (inf->pid != 0)

    {

      int *count_p = arg;

      (*count_p)++;

    }

  return 0;

}

static void

mi_on_resume (ptid_t ptid)

{

  struct thread_info *tp = NULL;

  if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid))

    tp = inferior_thread ();

  else

    tp = find_thread_ptid (ptid);

  /* Suppress output while calling an inferior function.  */

  if (tp->in_infcall)

    return;

  /* To cater for older frontends, emit ^running, but do it only once

     per each command.  We do it here, since at this point we know

     that the target was successfully resumed, and in non-async mode,

     we won't return back to MI interpreter code until the target

     is done running, so delaying the output of "^running" until then

     will make it impossible for frontend to know what's going on.

     In future (MI3), we'll be outputting "^done" here.  */

  if (!running_result_record_printed && mi_proceeded)

    {

      fprintf_unfiltered (raw_stdout, "%s^running\n",

                          current_token ? current_token : "");

    }

  if (PIDGET (ptid) == -1)

    fprintf_unfiltered (raw_stdout, "*running,thread-id=\"all\"\n");

  else if (ptid_is_pid (ptid))

    {

      int count = 0;

      /* Backwards compatibility.  If there's only one inferior,

         output "all", otherwise, output each resumed thread

         individually.  */

      iterate_over_inferiors (mi_inferior_count, &count);

      if (count == 1)

        fprintf_unfiltered (raw_stdout, "*running,thread-id=\"all\"\n");

      else

        iterate_over_threads (mi_output_running_pid, &ptid);

    }

  else

    {

      struct thread_info *ti = find_thread_ptid (ptid);

      gdb_assert (ti);

      fprintf_unfiltered (raw_stdout, "*running,thread-id=\"%d\"\n", ti->num);

    }

  if (!running_result_record_printed && mi_proceeded)

    {

      running_result_record_printed = 1;

      /* This is what gdb used to do historically -- printing prompt even if

         it cannot actually accept any input.  This will be surely removed

         for MI3, and may be removed even earler.  */

      /* FIXME: review the use of target_is_async_p here -- is that

         what we want? */

      if (!target_is_async_p ())

        fputs_unfiltered ("(gdb) \n", raw_stdout);

    }

  gdb_flush (raw_stdout);

}

static void

mi_solib_loaded (struct so_list *solib)

{

  struct mi_interp *mi = top_level_interpreter_data ();

  target_terminal_ours ();

  fprintf_unfiltered (mi->event_channel,

                      "library-loaded,id=\"%s\",target-name=\"%s\",host-name=\"%s\",symbols-loaded=\"%d\"",

                      solib->so_original_name, solib->so_original_name,

                      solib->so_name, solib->symbols_loaded);

  gdb_flush (mi->event_channel);

}

static void

mi_solib_unloaded (struct so_list *solib)

{

  struct mi_interp *mi = top_level_interpreter_data ();

  target_terminal_ours ();

  fprintf_unfiltered (mi->event_channel,

                      "library-unloaded,id=\"%s\",target-name=\"%s\",host-name=\"%s\"",

                      solib->so_original_name, solib->so_original_name,

                      solib->so_name);

  gdb_flush (mi->event_channel);

}

extern initialize_file_ftype _initialize_mi_interp; /* -Wmissing-prototypes */

void

_initialize_mi_interp (void)

{

  static const struct interp_procs procs =

  {

    mi_interpreter_init,        /* init_proc */

    mi_interpreter_resume,      /* resume_proc */

    mi_interpreter_suspend,     /* suspend_proc */

    mi_interpreter_exec,        /* exec_proc */

    mi_interpreter_prompt_p     /* prompt_proc_p */

  };

  /* The various interpreter levels.  */

  interp_add (interp_new (INTERP_MI1, NULL, mi_out_new (1), &procs));

  interp_add (interp_new (INTERP_MI2, NULL, mi_out_new (2), &procs));

  interp_add (interp_new (INTERP_MI3, NULL, mi_out_new (3), &procs));

  /* "mi" selects the most recent released version.  "mi2" was

     released as part of GDB 6.0.  */

  interp_add (interp_new (INTERP_MI, NULL, mi_out_new (2), &procs));

}