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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [inf-loop.c] - Blame information for rev 227

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1 227 jeremybenn
/* Handling of inferior events for the event loop for GDB, the GNU debugger.
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   Copyright (C) 1999, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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   Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"           /* For fetch_inferior_event. */
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#include "target.h"             /* For enum inferior_event_type. */
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#include "event-loop.h"
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#include "event-top.h"
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#include "inf-loop.h"
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#include "remote.h"
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#include "exceptions.h"
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#include "language.h"
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#include "gdbthread.h"
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static int fetch_inferior_event_wrapper (gdb_client_data client_data);
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void
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inferior_event_handler_wrapper (gdb_client_data client_data)
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{
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  inferior_event_handler (INF_QUIT_REQ, client_data);
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}
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/* General function to handle events in the inferior. So far it just
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   takes care of detecting errors reported by select() or poll(),
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   otherwise it assumes that all is OK, and goes on reading data from
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   the fd. This however may not always be what we want to do. */
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void
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inferior_event_handler (enum inferior_event_type event_type,
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                        gdb_client_data client_data)
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{
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  struct gdb_exception e;
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  int was_sync = 0;
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  switch (event_type)
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    {
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    case INF_ERROR:
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      printf_unfiltered (_("error detected from target.\n"));
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      pop_all_targets_above (file_stratum, 0);
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      discard_all_intermediate_continuations ();
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      discard_all_continuations ();
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      async_enable_stdin ();
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      break;
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    case INF_REG_EVENT:
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      /* Use catch errors for now, until the inner layers of
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         fetch_inferior_event (i.e. readchar) can return meaningful
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         error status.  If an error occurs while getting an event from
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         the target, just get rid of the target. */
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      if (!catch_errors (fetch_inferior_event_wrapper,
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                         client_data, "", RETURN_MASK_ALL))
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        {
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          pop_all_targets_above (file_stratum, 0);
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          discard_all_intermediate_continuations ();
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          discard_all_continuations ();
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          async_enable_stdin ();
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          display_gdb_prompt (0);
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        }
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      break;
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    case INF_EXEC_COMPLETE:
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      if (!non_stop)
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        {
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          /* Unregister the inferior from the event loop. This is done
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             so that when the inferior is not running we don't get
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             distracted by spurious inferior output.  */
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          if (target_has_execution)
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            target_async (NULL, 0);
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        }
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      /* The call to async_enable_stdin below resets 'sync_execution'.
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         However, if sync_execution is 1 now, we also need to show the
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         prompt below, so save the current value.  */
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      was_sync = sync_execution;
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      async_enable_stdin ();
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      /* Do all continuations associated with the whole inferior (not
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         a particular thread).  */
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      if (!ptid_equal (inferior_ptid, null_ptid))
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        do_all_inferior_continuations ();
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      /* If we were doing a multi-step (eg: step n, next n), but it
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         got interrupted by a breakpoint, still do the pending
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         continuations.  The continuation itself is responsible for
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         distinguishing the cases.  The continuations are allowed to
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         touch the inferior memory, e.g. to remove breakpoints, so run
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         them before running breakpoint commands, which may resume the
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         target.  */
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      if (non_stop
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          && target_has_execution
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          && !ptid_equal (inferior_ptid, null_ptid))
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        do_all_intermediate_continuations_thread (inferior_thread ());
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      else
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        do_all_intermediate_continuations ();
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      /* Always finish the previous command before running any
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         breakpoint commands.  Any stop cancels the previous command.
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         E.g. a "finish" or "step-n" command interrupted by an
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         unrelated breakpoint is canceled.  */
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      if (non_stop
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          && target_has_execution
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          && !ptid_equal (inferior_ptid, null_ptid))
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        do_all_continuations_thread (inferior_thread ());
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      else
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        do_all_continuations ();
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      if (current_language != expected_language
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          && language_mode == language_mode_auto)
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        language_info (1);      /* Print what changed.  */
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      /* Don't propagate breakpoint commands errors.  Either we're
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         stopping or some command resumes the inferior.  The user will
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         be informed.  */
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      TRY_CATCH (e, RETURN_MASK_ALL)
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        {
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          bpstat_do_actions ();
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        }
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      if (!was_sync
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          && exec_done_display_p
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          && (ptid_equal (inferior_ptid, null_ptid)
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              || !is_running (inferior_ptid)))
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        printf_unfiltered (_("completed.\n"));
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      break;
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    case INF_EXEC_CONTINUE:
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      /* Is there anything left to do for the command issued to
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         complete? */
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      if (non_stop)
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        do_all_intermediate_continuations_thread (inferior_thread ());
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      else
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        do_all_intermediate_continuations ();
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      break;
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    case INF_QUIT_REQ:
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      /* FIXME: ezannoni 1999-10-04. This call should really be a
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         target vector entry, so that it can be used for any kind of
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         targets. */
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      async_remote_interrupt_twice (NULL);
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      break;
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    case INF_TIMER:
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    default:
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      printf_unfiltered (_("Event type not recognized.\n"));
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      break;
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    }
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}
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static int
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fetch_inferior_event_wrapper (gdb_client_data client_data)
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{
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  fetch_inferior_event (client_data);
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  return 1;
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}

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