/* Handling of inferior events for the event loop for GDB, the GNU debugger.
- Copyright (C) 1999-2014 Free Software Foundation, Inc.
+ Copyright (C) 1999-2019 Free Software Foundation, Inc.
Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
This file is part of GDB.
#include "defs.h"
#include "inferior.h"
#include "infrun.h"
-#include "target.h" /* For enum inferior_event_type. */
#include "event-loop.h"
#include "event-top.h"
#include "inf-loop.h"
#include "remote.h"
-#include "exceptions.h"
#include "language.h"
#include "gdbthread.h"
#include "continuations.h"
#include "interps.h"
#include "top.h"
+#include "observable.h"
-static int fetch_inferior_event_wrapper (gdb_client_data client_data);
+/* General function to handle events in the inferior. */
-/* General function to handle events in the inferior. So far it just
- takes care of detecting errors reported by select() or poll(),
- otherwise it assumes that all is OK, and goes on reading data from
- the fd. This however may not always be what we want to do. */
void
inferior_event_handler (enum inferior_event_type event_type,
gdb_client_data client_data)
{
- struct cleanup *cleanup_if_error = make_bpstat_clear_actions_cleanup ();
-
switch (event_type)
{
case INF_REG_EVENT:
- /* Use catch errors for now, until the inner layers of
- fetch_inferior_event (i.e. readchar) can return meaningful
- error status. If an error occurs while getting an event from
- the target, just cancel the current command. */
- if (!catch_errors (fetch_inferior_event_wrapper,
- client_data, "", RETURN_MASK_ALL))
- {
- bpstat_clear_actions ();
- do_all_intermediate_continuations (1);
- do_all_continuations (1);
- async_enable_stdin ();
- display_gdb_prompt (0);
- }
+ fetch_inferior_event (client_data);
break;
case INF_EXEC_COMPLETE:
/* Unregister the inferior from the event loop. This is done
so that when the inferior is not running we don't get
distracted by spurious inferior output. */
- if (target_has_execution)
- target_async (NULL, 0);
+ if (target_has_execution && target_can_async_p ())
+ target_async (0);
}
/* Do all continuations associated with the whole inferior (not
a particular thread). */
- if (!ptid_equal (inferior_ptid, null_ptid))
+ if (inferior_ptid != null_ptid)
do_all_inferior_continuations (0);
- /* If we were doing a multi-step (eg: step n, next n), but it
- got interrupted by a breakpoint, still do the pending
- continuations. The continuation itself is responsible for
- distinguishing the cases. The continuations are allowed to
- touch the inferior memory, e.g. to remove breakpoints, so run
- them before running breakpoint commands, which may resume the
- target. */
- if (non_stop
- && target_has_execution
- && !ptid_equal (inferior_ptid, null_ptid))
- do_all_intermediate_continuations_thread (inferior_thread (), 0);
- else
- do_all_intermediate_continuations (0);
-
- /* Always finish the previous command before running any
- breakpoint commands. Any stop cancels the previous command.
- E.g. a "finish" or "step-n" command interrupted by an
- unrelated breakpoint is canceled. */
- if (non_stop
- && target_has_execution
- && !ptid_equal (inferior_ptid, null_ptid))
- do_all_continuations_thread (inferior_thread (), 0);
- else
- do_all_continuations (0);
-
/* When running a command list (from a user command, say), these
are only run when the command list is all done. */
- if (interpreter_async)
+ if (current_ui->async)
{
- volatile struct gdb_exception e;
-
check_frame_language_change ();
/* Don't propagate breakpoint commands errors. Either we're
stopping or some command resumes the inferior. The user will
be informed. */
- TRY_CATCH (e, RETURN_MASK_ALL)
+ try
{
bpstat_do_actions ();
}
- exception_print (gdb_stderr, e);
+ catch (const gdb_exception &e)
+ {
+ /* If the user was running a foreground execution
+ command, then propagate the error so that the prompt
+ can be reenabled. Otherwise, the user already has
+ the prompt and is typing some unrelated command, so
+ just inform the user and swallow the exception. */
+ if (current_ui->prompt_state == PROMPT_BLOCKED)
+ throw;
+ else
+ exception_print (gdb_stderr, e);
+ }
}
break;
- case INF_EXEC_CONTINUE:
- /* Is there anything left to do for the command issued to
- complete? */
-
- if (non_stop)
- do_all_intermediate_continuations_thread (inferior_thread (), 0);
- else
- do_all_intermediate_continuations (0);
- break;
-
- case INF_TIMER:
default:
printf_unfiltered (_("Event type not recognized.\n"));
break;
}
-
- discard_cleanups (cleanup_if_error);
-}
-
-static int
-fetch_inferior_event_wrapper (gdb_client_data client_data)
-{
- fetch_inferior_event (client_data);
- return 1;
}