darling-gdb/gdb/inf-loop.c
Pedro Alves 604ead4a92 2008-07-12 Pedro Alves <pedro@codesourcery.com>
Rewrite continuations internals on top of cleanups and plug
	continuation arguments leaks.

	* defs.h (struct continuation): Make it opaque.
	(add_continuation, add_intermediate_continuation): Drop the int
	argument of the continuation hook argument.  Add
	continuation_free_args argument.
	(do_all_continuations, do_all_intermediate_continuations): Drop
	the error_p argument.

	* utils.c (add_continuation): Drop the int argument of the
	continuation hook argument.  Add continuation_free_args argument.
	Reimplement on top of cleanups.
	(do_all_continuations): Drop error argument.  Reimplement on top
	of cleanups.
	(discard_all_continuations): Reimplement on top of cleanups.
	(add_intermediate_continuation): Drop the int argument of the
	continuation hook argument.  Add continuation_free_args argument.
	Reimplement on top of cleanups.
	(do_all_intermediate_continuations): Drop error argument.
	Reimplement on top of cleanups.
	(discard_all_intermediate_continuations): Reimplement on top of
	cleanups.

	* breakpoint.c (until_break_command_continuation): Drop error
	argument.  Add xfree as continuation argument deleter.

	* inf-loop.c (inferior_event_handler): On error, discard all
	continuations.  Adjust to new do_all_intermediate_continuations
	and do_all_continuations interfaces.

	* infcmd.c (step_1_continuation): Drop error_p argument.  Adjust.
	Pass xfree as continuation argument deleter.
	(finish_command_continuation): Drop error_p argument.  Adjust.
	(finish_command_continuation_free_arg): New.
	(finish_command): Pass finish_command_continuation_free_arg as
	continuation argument deleter.  Adjust to new do_all_continuations
	interfaces.
	(attach_command_continuation): Drop error_p argument.
	(attach_command_continuation_free_args): New.
	(attach_command): Pass attach_command_continuation_free_args as
	continuation argument deleter.

	* interps.c (interp_set): Adjust to new do_all_continuations
	interfaces.

	* event-top.c (stdin_event_handler): In error, also discard the
	intermediate continuations.
2008-07-12 19:25:42 +00:00

151 lines
4.9 KiB
C

/* Handling of inferior events for the event loop for GDB, the GNU debugger.
Copyright (C) 1999, 2007, 2008 Free Software Foundation, Inc.
Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
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 "inferior.h" /* For fetch_inferior_event. */
#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"
static int fetch_inferior_event_wrapper (gdb_client_data client_data);
void
inferior_event_handler_wrapper (gdb_client_data client_data)
{
inferior_event_handler (INF_QUIT_REQ, client_data);
}
/* 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 gdb_exception e;
int was_sync = 0;
switch (event_type)
{
case INF_ERROR:
printf_unfiltered (_("error detected from target.\n"));
target_async (NULL, 0);
pop_target ();
discard_all_intermediate_continuations ();
discard_all_continuations ();
async_enable_stdin ();
break;
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 get rid of the target. */
if (!catch_errors (fetch_inferior_event_wrapper,
client_data, "", RETURN_MASK_ALL))
{
target_async (NULL, 0);
pop_target ();
discard_all_intermediate_continuations ();
discard_all_continuations ();
async_enable_stdin ();
display_gdb_prompt (0);
}
break;
case INF_EXEC_COMPLETE:
if (!non_stop)
{
/* 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);
}
/* The call to async_enable_stdin below resets 'sync_execution'.
However, if sync_execution is 1 now, we also need to show the
prompt below, so save the current value. */
was_sync = sync_execution;
async_enable_stdin ();
/* 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. */
do_all_intermediate_continuations ();
/* 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. */
do_all_continuations ();
if (current_language != expected_language
&& language_mode == language_mode_auto)
language_info (1); /* Print what changed. */
/* 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)
{
bpstat_do_actions (&stop_bpstat);
}
if (!was_sync && !is_running (inferior_ptid) && exec_done_display_p)
printf_unfiltered (_("completed.\n"));
break;
case INF_EXEC_CONTINUE:
/* Is there anything left to do for the command issued to
complete? */
do_all_intermediate_continuations ();
break;
case INF_QUIT_REQ:
/* FIXME: ezannoni 1999-10-04. This call should really be a
target vector entry, so that it can be used for any kind of
targets. */
async_remote_interrupt_twice (NULL);
break;
case INF_TIMER:
default:
printf_unfiltered (_("Event type not recognized.\n"));
break;
}
}
static int
fetch_inferior_event_wrapper (gdb_client_data client_data)
{
fetch_inferior_event (client_data);
return 1;
}