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/tmp/gdb-7.10/gdb/inf-loop.c
Go to the documentation of this file.
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/* 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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TRY
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{
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fetch_inferior_event
(client_data);
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}
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CATCH
(ex,
RETURN_MASK_ALL
)
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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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END_CATCH
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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
(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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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
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{
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bpstat_do_actions
();
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}
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CATCH
(e,
RETURN_MASK_ALL
)
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{
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exception_print
(
gdb_stderr
, e);
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}
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END_CATCH
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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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}
top.h
do_all_intermediate_continuations_thread
void do_all_intermediate_continuations_thread(struct thread_info *thread, int err)
Definition:
continuations.c:285
do_all_intermediate_continuations
void do_all_intermediate_continuations(int err)
Definition:
continuations.c:293
ptid_equal
int ptid_equal(ptid_t ptid1, ptid_t ptid2)
Definition:
ptid.c:76
RETURN_MASK_ALL
Definition:
common-exceptions.h:45
bpstat_clear_actions
void bpstat_clear_actions(void)
Definition:
breakpoint.c:4508
INF_EXEC_COMPLETE
Definition:
target.h:125
inferior_thread
struct thread_info * inferior_thread(void)
Definition:
thread.c:85
INF_REG_EVENT
Definition:
target.h:121
cleanup
Definition:
cleanups.c:38
_
#define _(String)
Definition:
gdb_locale.h:40
defs.h
END_CATCH
#define END_CATCH
Definition:
common-exceptions.h:176
observer.h
event-loop.h
TRY
#define TRY
Definition:
common-exceptions.h:162
CATCH
#define CATCH(EXCEPTION, MASK)
Definition:
common-exceptions.h:171
inferior_event_handler
void inferior_event_handler(enum inferior_event_type event_type, gdb_client_data client_data)
Definition:
inf-loop.c:40
do_all_continuations_thread
void do_all_continuations_thread(struct thread_info *thread, int err)
Definition:
continuations.c:209
exception_print
void exception_print(struct ui_file *file, struct gdb_exception e)
Definition:
exceptions.c:109
inf-loop.h
gdbthread.h
inferior.h
infrun.h
language.h
interpreter_async
int interpreter_async
Definition:
interps.c:46
target_has_execution
#define target_has_execution
Definition:
target.h:1726
printf_unfiltered
void printf_unfiltered(const char *format,...)
Definition:
utils.c:2399
INF_EXEC_CONTINUE
Definition:
target.h:130
interps.h
gdb_client_data
void * gdb_client_data
Definition:
event-loop.h:70
fetch_inferior_event
void fetch_inferior_event(void *client_data)
Definition:
infrun.c:3257
event-top.h
inferior_event_type
inferior_event_type
Definition:
target.h:117
throw_exception
void throw_exception(struct gdb_exception exception)
Definition:
common-exceptions.c:269
discard_cleanups
void discard_cleanups(struct cleanup *old_chain)
Definition:
cleanups.c:213
non_stop
int non_stop
Definition:
infrun.c:180
null_ptid
ptid_t null_ptid
Definition:
ptid.c:25
check_frame_language_change
void check_frame_language_change(void)
Definition:
top.c:330
make_bpstat_clear_actions_cleanup
struct cleanup * make_bpstat_clear_actions_cleanup(void)
Definition:
utils.c:3137
gdb_stderr
struct ui_file * gdb_stderr
Definition:
main.c:72
inferior_ptid
ptid_t inferior_ptid
Definition:
infcmd.c:124
remote.h
do_all_inferior_continuations
void do_all_inferior_continuations(int err)
Definition:
continuations.c:122
target.h
bpstat_do_actions
void bpstat_do_actions(void)
Definition:
breakpoint.c:4668
INF_TIMER
Definition:
target.h:123
target_async
#define target_async(ENABLE)
Definition:
target.h:1754
do_all_continuations
void do_all_continuations(int err)
Definition:
continuations.c:217
continuations.h
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