static int
handle_command_errors (struct gdb_exception e)
{
if (e.reason < 0)
{
exception_print (gdb_stderr, e);
/* If any exception escaped to here, we better enable stdin.
Otherwise, any command that calls async_disable_stdin, and
then throws, will leave stdin inoperable. */
async_enable_stdin ();
return 0;
}
return 1;
}
void
start_event_loop (void)
{
/* Loop until there is nothing to do. This is the entry point to the
event loop engine. gdb_do_one_event, called via catch_errors()
will process one event for each invocation. It blocks waits for
an event and then processes it. >0 when an event is processed, 0
when catch_errors() caught an error and <0 when there are no
longer any event sources registered. */
while (1)
{
int gdb_result;
gdb_result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
if (gdb_result < 0)
break;
/* If we long-jumped out of do_one_event, we probably
didn't get around to resetting the prompt, which leaves
readline in a messed-up state. Reset it here. */
if (gdb_result == 0)
{
/* If any exception escaped to here, we better enable
stdin. Otherwise, any command that calls async_disable_stdin,
and then throws, will leave stdin inoperable. */
async_enable_stdin ();
/* FIXME: this should really be a call to a hook that is
interface specific, because interfaces can display the
prompt in their own way. */
display_gdb_prompt (0);
/* This call looks bizarre, but it is required. If the user
entered a command that caused an error,
after_char_processing_hook won't be called from
rl_callback_read_char_wrapper. Using a cleanup there
won't work, since we want this function to be called
after a new prompt is printed. */
if (after_char_processing_hook)
(*after_char_processing_hook) ();
/* Maybe better to set a flag to be checked somewhere as to
whether display the prompt or not. */
}
}
/* We are done with the event loop. There are no more event sources
to listen to. So we exit GDB. */
return;
}
void
start_event_loop (void)
{
/* Loop until there is nothing to do. This is the entry point to
the event loop engine. gdb_do_one_event will process one event
for each invocation. It blocks waiting for an event and then
processes it. */
while (1)
{
int result = 0;
TRY
{
result = gdb_do_one_event ();
}
CATCH (ex, RETURN_MASK_ALL)
{
exception_print (gdb_stderr, ex);
/* If any exception escaped to here, we better enable
stdin. Otherwise, any command that calls async_disable_stdin,
and then throws, will leave stdin inoperable. */
async_enable_stdin ();
/* If we long-jumped out of do_one_event, we probably didn't
get around to resetting the prompt, which leaves readline
in a messed-up state. Reset it here. */
current_ui->prompt_state = PROMPT_NEEDED;
observer_notify_command_error ();
/* This call looks bizarre, but it is required. If the user
entered a command that caused an error,
after_char_processing_hook won't be called from
rl_callback_read_char_wrapper. Using a cleanup there
won't work, since we want this function to be called
after a new prompt is printed. */
if (after_char_processing_hook)
(*after_char_processing_hook) ();
/* Maybe better to set a flag to be checked somewhere as to
whether display the prompt or not. */
}
END_CATCH
if (result < 0)
break;
}
/* 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);
}
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);
}
/* Do all continuations associated with the whole inferior (not
a particular thread). */
if (!ptid_equal (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)
{
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)
{
bpstat_do_actions ();
}
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);
}
/* 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"));
pop_all_targets_above (file_stratum, 0);
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))
{
pop_all_targets_above (file_stratum, 0);
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 ();
/* Do all continuations associated with the whole inferior (not
a particular thread). */
if (!ptid_equal (inferior_ptid, null_ptid))
do_all_inferior_continuations ();
/* 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 ());
else
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. */
if (non_stop
&& target_has_execution
&& !ptid_equal (inferior_ptid, null_ptid))
do_all_continuations_thread (inferior_thread ());
else
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 ();
}
if (!was_sync
&& exec_done_display_p
&& (ptid_equal (inferior_ptid, null_ptid)
|| !is_running (inferior_ptid)))
printf_unfiltered (_("completed.\n"));
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 ());
else
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 void
tui_command_loop (void *data)
{
/* If we are using readline, set things up and display the first
prompt, otherwise just print the prompt. */
if (async_command_editing_p)
{
int length;
char *a_prompt;
char *gdb_prompt = get_prompt ();
/* Tell readline what the prompt to display is and what function
it will need to call after a whole line is read. This also
displays the first prompt. */
length = strlen (PREFIX (0))
+ strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
a_prompt = (char *) alloca (length);
strcpy (a_prompt, PREFIX (0));
strcat (a_prompt, gdb_prompt);
strcat (a_prompt, SUFFIX (0));
rl_callback_handler_install (a_prompt, input_handler);
}
else
display_gdb_prompt (0);
/* Loop until there is nothing to do. This is the entry point to the
event loop engine. gdb_do_one_event, called via catch_errors()
will process one event for each invocation. It blocks waits for
an event and then processes it. >0 when an event is processed, 0
when catch_errors() caught an error and <0 when there are no
longer any event sources registered. */
while (1)
{
int result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
if (result < 0)
break;
/* Update gdb output according to TUI mode. Since catch_errors
preserves the uiout from changing, this must be done at top
level of event loop. */
if (tui_active)
uiout = tui_out;
else
uiout = tui_old_uiout;
if (result == 0)
{
/* If any exception escaped to here, we better enable
stdin. Otherwise, any command that calls async_disable_stdin,
and then throws, will leave stdin inoperable. */
async_enable_stdin ();
/* FIXME: this should really be a call to a hook that is
interface specific, because interfaces can display the
prompt in their own way. */
display_gdb_prompt (0);
/* This call looks bizarre, but it is required. If the user
entered a command that caused an error,
after_char_processing_hook won't be called from
rl_callback_read_char_wrapper. Using a cleanup there
won't work, since we want this function to be called
after a new prompt is printed. */
if (after_char_processing_hook)
(*after_char_processing_hook) ();
/* Maybe better to set a flag to be checked somewhere as to
whether display the prompt or not. */
}
}
/* We are done with the event loop. There are no more event sources
to listen to. So we exit GDB. */
return;
}
