147 lines
4.6 KiB
C
147 lines
4.6 KiB
C
/* Handling of inferior events for the event loop for GDB, the GNU debugger.
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Copyright (C) 1999-2015 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"
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#include "infrun.h"
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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 "language.h"
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#include "gdbthread.h"
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#include "continuations.h"
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#include "interps.h"
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#include "top.h"
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#include "observer.h"
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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 cleanup *cleanup_if_error = make_bpstat_clear_actions_cleanup ();
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switch (event_type)
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{
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case INF_REG_EVENT:
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/* 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 cancel the current command. */
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{
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volatile struct gdb_exception ex;
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TRY_CATCH (ex, RETURN_MASK_ALL)
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{
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fetch_inferior_event (client_data);
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}
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if (ex.reason < 0)
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{
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bpstat_clear_actions ();
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do_all_intermediate_continuations (1);
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do_all_continuations (1);
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throw_exception (ex);
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}
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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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/* 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 (0);
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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 (), 0);
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else
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do_all_intermediate_continuations (0);
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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 (), 0);
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else
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do_all_continuations (0);
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/* When running a command list (from a user command, say), these
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are only run when the command list is all done. */
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if (interpreter_async)
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{
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volatile struct gdb_exception e;
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check_frame_language_change ();
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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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exception_print (gdb_stderr, e);
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}
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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 (), 0);
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else
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do_all_intermediate_continuations (0);
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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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discard_cleanups (cleanup_if_error);
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}
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