#include "gdb-stabs.h"
#include "gdbthread.h"
#include "remote.h"
+#include "remote-notif.h"
#include "regcache.h"
#include "value.h"
#include "gdb_assert.h"
static void initialize_sigint_signal_handler (void);
static int getpkt_sane (char **buf, long *sizeof_buf, int forever);
static int getpkt_or_notif_sane (char **buf, long *sizeof_buf,
- int forever);
+ int forever, int *is_notif);
static void handle_remote_sigint (int);
static void handle_remote_sigint_twice (int);
void _initialize_remote (void);
struct stop_reply;
-static struct stop_reply *stop_reply_xmalloc (void);
static void stop_reply_xfree (struct stop_reply *);
-static void do_stop_reply_xfree (void *arg);
-static void remote_parse_stop_reply (char *buf, struct stop_reply *);
+static void remote_parse_stop_reply (char *, struct stop_reply *);
static void push_stop_reply (struct stop_reply *);
-static void remote_get_pending_stop_replies (void);
-static void discard_pending_stop_replies (int pid);
+static void discard_pending_stop_replies (struct inferior *);
static int peek_stop_reply (ptid_t ptid);
static void remote_async_inferior_event_handler (gdb_client_data);
-static void remote_async_get_pending_events_handler (gdb_client_data);
static void remote_terminal_ours (void);
static int remote_can_run_breakpoint_commands (void);
-/* The non-stop remote protocol provisions for one pending stop reply.
- This is where we keep it until it is acknowledged. */
-
-static struct stop_reply *pending_stop_reply = NULL;
-
/* For "remote". */
static struct cmd_list_element *remote_cmdlist;
static struct async_event_handler *remote_async_inferior_event_token;
-/* Asynchronous signal handle registered as event loop source for when
- the remote sent us a %Stop notification. The registered callback
- will do a vStopped sequence to pull the rest of the events out of
- the remote side into our event queue. */
-
-static struct async_event_handler *remote_async_get_pending_events_token;
\f
static ptid_t magic_null_ptid;
inferior_ptid = null_ptid;
discard_all_inferiors ();
- /* We're no longer interested in any of these events. */
- discard_pending_stop_replies (-1);
+ /* Stop replies may from inferiors which are still unknown to GDB.
+ We are closing the remote target, so we should discard
+ everything, including the stop replies from GDB-unknown
+ inferiors. */
+ discard_pending_stop_replies (NULL);
if (remote_async_inferior_event_token)
delete_async_event_handler (&remote_async_inferior_event_token);
- if (remote_async_get_pending_events_token)
- delete_async_event_handler (&remote_async_get_pending_events_token);
+
+ remote_notif_unregister_async_event_handler ();
}
/* Query the remote side for the text, data and bss offsets. */
else if (rs->non_stop_aware)
{
/* Don't assume that the stub can operate in all-stop mode.
- Request it explicitely. */
+ Request it explicitly. */
putpkt ("QNonStop:0");
getpkt (&rs->buf, &rs->buf_size, 0);
mechanism. */
if (strcmp (rs->buf, "OK") != 0)
{
- struct stop_reply *stop_reply;
- struct cleanup *old_chain;
-
- stop_reply = stop_reply_xmalloc ();
- old_chain = make_cleanup (do_stop_reply_xfree, stop_reply);
+ struct notif_client *notif = ¬if_client_stop;
- remote_parse_stop_reply (rs->buf, stop_reply);
- discard_cleanups (old_chain);
-
- /* get_pending_stop_replies acks this one, and gets the rest
- out. */
- pending_stop_reply = stop_reply;
- remote_get_pending_stop_replies ();
+ /* remote_notif_get_pending_replies acks this one, and gets
+ the rest out. */
+ notif_client_stop.pending_event
+ = remote_notif_parse (notif, rs->buf);
+ remote_notif_get_pending_events (notif);
/* Make sure that threads that were stopped remain
stopped. */
remote_async_inferior_event_token
= create_async_event_handler (remote_async_inferior_event_handler,
NULL);
- remote_async_get_pending_events_token
- = create_async_event_handler (remote_async_get_pending_events_handler,
- NULL);
+ remote_notif_register_async_event_handler ();
/* Reset the target state; these things will be queried either by
remote_query_supported or as they are needed. */
if (from_tty && !extended)
puts_filtered (_("Ending remote debugging.\n"));
- discard_pending_stop_replies (pid);
target_mourn_inferior ();
}
if (target_can_async_p ())
{
- struct stop_reply *stop_reply;
- struct cleanup *old_chain;
+ struct notif_event *reply
+ = remote_notif_parse (¬if_client_stop, wait_status);
- stop_reply = stop_reply_xmalloc ();
- old_chain = make_cleanup (do_stop_reply_xfree, stop_reply);
- remote_parse_stop_reply (wait_status, stop_reply);
- discard_cleanups (old_chain);
- push_stop_reply (stop_reply);
+ push_stop_reply ((struct stop_reply *) reply);
target_async (inferior_event_handler, 0);
}
struct remote_state *rs = get_remote_state ();
char *buf;
+ /* In all-stop, we can't mark REMOTE_ASYNC_GET_PENDING_EVENTS_TOKEN
+ (explained in remote-notif.c:handle_notification) so
+ remote_notif_process is not called. We need find a place where
+ it is safe to start a 'vNotif' sequence. It is good to do it
+ before resuming inferior, because inferior was stopped and no RSP
+ traffic at that moment. */
+ if (!non_stop)
+ remote_notif_process (¬if_client_stop);
+
last_sent_signal = siggnal;
last_sent_step = step;
DEF_VEC_O(cached_reg_t);
-struct stop_reply
+typedef struct stop_reply
{
- struct stop_reply *next;
+ struct notif_event base;
+ /* The identifier of the thread about this event */
ptid_t ptid;
struct target_waitstatus ws;
int replay_event;
int core;
-};
-
-/* The list of already fetched and acknowledged stop events. */
-static struct stop_reply *stop_reply_queue;
-
-static struct stop_reply *
-stop_reply_xmalloc (void)
-{
- struct stop_reply *r = XMALLOC (struct stop_reply);
+} *stop_reply_p;
- r->next = NULL;
- return r;
-}
+DECLARE_QUEUE_P (stop_reply_p);
+DEFINE_QUEUE_P (stop_reply_p);
+/* The list of already fetched and acknowledged stop events. This
+ queue is used for notification Stop, and other notifications
+ don't need queue for their events, because the notification events
+ of Stop can't be consumed immediately, so that events should be
+ queued first, and be consumed by remote_wait_{ns,as} one per
+ time. Other notifications can consume their events immediately,
+ so queue is not needed for them. */
+static QUEUE (stop_reply_p) *stop_reply_queue;
static void
stop_reply_xfree (struct stop_reply *r)
}
}
-/* Discard all pending stop replies of inferior PID. If PID is -1,
+static void
+remote_notif_stop_parse (struct notif_client *self, char *buf,
+ struct notif_event *event)
+{
+ remote_parse_stop_reply (buf, (struct stop_reply *) event);
+}
+
+static void
+remote_notif_stop_ack (struct notif_client *self, char *buf,
+ struct notif_event *event)
+{
+ struct stop_reply *stop_reply = (struct stop_reply *) event;
+
+ /* acknowledge */
+ putpkt ((char *) self->ack_command);
+
+ if (stop_reply->ws.kind == TARGET_WAITKIND_IGNORE)
+ /* We got an unknown stop reply. */
+ error (_("Unknown stop reply"));
+
+ push_stop_reply (stop_reply);
+}
+
+static int
+remote_notif_stop_can_get_pending_events (struct notif_client *self)
+{
+ /* We can't get pending events in remote_notif_process for
+ notification stop, and we have to do this in remote_wait_ns
+ instead. If we fetch all queued events from stub, remote stub
+ may exit and we have no chance to process them back in
+ remote_wait_ns. */
+ mark_async_event_handler (remote_async_inferior_event_token);
+ return 0;
+}
+
+static void
+stop_reply_dtr (struct notif_event *event)
+{
+ struct stop_reply *r = (struct stop_reply *) event;
+
+ VEC_free (cached_reg_t, r->regcache);
+}
+
+static struct notif_event *
+remote_notif_stop_alloc_reply (void)
+{
+ struct notif_event *r
+ = (struct notif_event *) XMALLOC (struct stop_reply);
+
+ r->dtr = stop_reply_dtr;
+
+ return r;
+}
+
+/* A client of notification Stop. */
+
+struct notif_client notif_client_stop =
+{
+ "Stop",
+ "vStopped",
+ remote_notif_stop_parse,
+ remote_notif_stop_ack,
+ remote_notif_stop_can_get_pending_events,
+ remote_notif_stop_alloc_reply,
+ NULL,
+};
+
+/* A parameter to pass data in and out. */
+
+struct queue_iter_param
+{
+ void *input;
+ struct stop_reply *output;
+};
+
+/* Remove all queue elements meet the condition it checks. */
+
+static int
+remote_notif_remove_all (QUEUE (stop_reply_p) *q,
+ QUEUE_ITER (stop_reply_p) *iter,
+ stop_reply_p event,
+ void *data)
+{
+ struct queue_iter_param *param = data;
+ struct inferior *inf = param->input;
+
+ if (inf == NULL || ptid_get_pid (event->ptid) == inf->pid)
+ {
+ stop_reply_xfree (event);
+ QUEUE_remove_elem (stop_reply_p, q, iter);
+ }
+
+ return 1;
+}
+
+/* Discard all pending stop replies of inferior INF. If INF is NULL,
discard everything. */
static void
-discard_pending_stop_replies (int pid)
+discard_pending_stop_replies (struct inferior *inf)
{
- struct stop_reply *prev = NULL, *reply, *next;
+ int i;
+ struct queue_iter_param param;
+ struct stop_reply *reply
+ = (struct stop_reply *) notif_client_stop.pending_event;
/* Discard the in-flight notification. */
- if (pending_stop_reply != NULL
- && (pid == -1
- || ptid_get_pid (pending_stop_reply->ptid) == pid))
+ if (reply != NULL
+ && (inf == NULL
+ || ptid_get_pid (reply->ptid) == inf->pid))
{
- stop_reply_xfree (pending_stop_reply);
- pending_stop_reply = NULL;
+ stop_reply_xfree (reply);
+ notif_client_stop.pending_event = NULL;
}
+ param.input = inf;
+ param.output = NULL;
/* Discard the stop replies we have already pulled with
vStopped. */
- for (reply = stop_reply_queue; reply; reply = next)
- {
- next = reply->next;
- if (pid == -1
- || ptid_get_pid (reply->ptid) == pid)
- {
- if (reply == stop_reply_queue)
- stop_reply_queue = reply->next;
- else
- prev->next = reply->next;
+ QUEUE_iterate (stop_reply_p, stop_reply_queue,
+ remote_notif_remove_all, ¶m);
+}
- stop_reply_xfree (reply);
- }
- else
- prev = reply;
+/* A parameter to pass data in and out. */
+
+static int
+remote_notif_remove_once_on_match (QUEUE (stop_reply_p) *q,
+ QUEUE_ITER (stop_reply_p) *iter,
+ stop_reply_p event,
+ void *data)
+{
+ struct queue_iter_param *param = data;
+ ptid_t *ptid = param->input;
+
+ if (ptid_match (event->ptid, *ptid))
+ {
+ param->output = event;
+ QUEUE_remove_elem (stop_reply_p, q, iter);
+ return 0;
}
+
+ return 1;
}
-/* Cleanup wrapper. */
+/* Remove the first reply in 'stop_reply_queue' which matches
+ PTID. */
-static void
-do_stop_reply_xfree (void *arg)
+static struct stop_reply *
+remote_notif_remove_queued_reply (ptid_t ptid)
{
- struct stop_reply *r = arg;
+ struct queue_iter_param param;
- stop_reply_xfree (r);
+ param.input = &ptid;
+ param.output = NULL;
+
+ QUEUE_iterate (stop_reply_p, stop_reply_queue,
+ remote_notif_remove_once_on_match, ¶m);
+ if (notif_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "notif: discard queued event: 'Stop' in %s\n",
+ target_pid_to_str (ptid));
+
+ return param.output;
}
/* Look for a queued stop reply belonging to PTID. If one is found,
static struct stop_reply *
queued_stop_reply (ptid_t ptid)
{
- struct stop_reply *it;
- struct stop_reply **it_link;
-
- it = stop_reply_queue;
- it_link = &stop_reply_queue;
- while (it)
- {
- if (ptid_match (it->ptid, ptid))
- {
- *it_link = it->next;
- it->next = NULL;
- break;
- }
+ struct stop_reply *r = remote_notif_remove_queued_reply (ptid);
- it_link = &it->next;
- it = *it_link;
- }
-
- if (stop_reply_queue)
+ if (!QUEUE_is_empty (stop_reply_p, stop_reply_queue))
/* There's still at least an event left. */
mark_async_event_handler (remote_async_inferior_event_token);
- return it;
+ return r;
}
/* Push a fully parsed stop reply in the stop reply queue. Since we
static void
push_stop_reply (struct stop_reply *new_event)
{
- struct stop_reply *event;
+ QUEUE_enque (stop_reply_p, stop_reply_queue, new_event);
- if (stop_reply_queue)
- {
- for (event = stop_reply_queue;
- event && event->next;
- event = event->next)
- ;
-
- event->next = new_event;
- }
- else
- stop_reply_queue = new_event;
+ if (notif_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "notif: push 'Stop' %s to queue %d\n",
+ target_pid_to_str (new_event->ptid),
+ QUEUE_length (stop_reply_p,
+ stop_reply_queue));
mark_async_event_handler (remote_async_inferior_event_token);
}
+static int
+stop_reply_match_ptid_and_ws (QUEUE (stop_reply_p) *q,
+ QUEUE_ITER (stop_reply_p) *iter,
+ struct stop_reply *event,
+ void *data)
+{
+ ptid_t *ptid = data;
+
+ return !(ptid_equal (*ptid, event->ptid)
+ && event->ws.kind == TARGET_WAITKIND_STOPPED);
+}
+
/* Returns true if we have a stop reply for PTID. */
static int
peek_stop_reply (ptid_t ptid)
{
- struct stop_reply *it;
-
- for (it = stop_reply_queue; it; it = it->next)
- if (ptid_equal (ptid, it->ptid))
- {
- if (it->ws.kind == TARGET_WAITKIND_STOPPED)
- return 1;
- }
-
- return 0;
+ return !QUEUE_iterate (stop_reply_p, stop_reply_queue,
+ stop_reply_match_ptid_and_ws, &ptid);
}
/* Parse the stop reply in BUF. Either the function succeeds, and the
error (_("No process or thread specified in stop reply: %s"), buf);
}
-/* When the stub wants to tell GDB about a new stop reply, it sends a
- stop notification (%Stop). Those can come it at any time, hence,
- we have to make sure that any pending putpkt/getpkt sequence we're
- making is finished, before querying the stub for more events with
- vStopped. E.g., if we started a vStopped sequence immediatelly
- upon receiving the %Stop notification, something like this could
- happen:
+/* When the stub wants to tell GDB about a new notification reply, it
+ sends a notification (%Stop, for example). Those can come it at
+ any time, hence, we have to make sure that any pending
+ putpkt/getpkt sequence we're making is finished, before querying
+ the stub for more events with the corresponding ack command
+ (vStopped, for example). E.g., if we started a vStopped sequence
+ immediately upon receiving the notification, something like this
+ could happen:
1.1) --> Hg 1
1.2) <-- OK
2.9) --> OK
*/
-static void
-remote_get_pending_stop_replies (void)
+void
+remote_notif_get_pending_events (struct notif_client *nc)
{
struct remote_state *rs = get_remote_state ();
- if (pending_stop_reply)
+ if (nc->pending_event)
{
- /* acknowledge */
- putpkt ("vStopped");
+ if (notif_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "notif: process: '%s' ack pending event\n",
+ nc->name);
- /* Now we can rely on it. */
- push_stop_reply (pending_stop_reply);
- pending_stop_reply = NULL;
+ /* acknowledge */
+ nc->ack (nc, rs->buf, nc->pending_event);
+ nc->pending_event = NULL;
while (1)
{
if (strcmp (rs->buf, "OK") == 0)
break;
else
- {
- struct cleanup *old_chain;
- struct stop_reply *stop_reply = stop_reply_xmalloc ();
-
- old_chain = make_cleanup (do_stop_reply_xfree, stop_reply);
- remote_parse_stop_reply (rs->buf, stop_reply);
-
- /* acknowledge */
- putpkt ("vStopped");
-
- if (stop_reply->ws.kind != TARGET_WAITKIND_IGNORE)
- {
- /* Now we can rely on it. */
- discard_cleanups (old_chain);
- push_stop_reply (stop_reply);
- }
- else
- /* We got an unknown stop reply. */
- do_cleanups (old_chain);
- }
+ remote_notif_ack (nc, rs->buf);
}
}
+ else
+ {
+ if (notif_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "notif: process: '%s' no pending reply\n",
+ nc->name);
+ }
}
-
/* Called when it is decided that STOP_REPLY holds the info of the
event that is to be returned to the core. This function always
destroys STOP_REPLY. */
struct remote_state *rs = get_remote_state ();
struct stop_reply *stop_reply;
int ret;
+ int is_notif = 0;
/* If in non-stop mode, get out of getpkt even if a
notification is received. */
ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size,
- 0 /* forever */);
+ 0 /* forever */, &is_notif);
while (1)
{
- if (ret != -1)
+ if (ret != -1 && !is_notif)
switch (rs->buf[0])
{
case 'E': /* Error of some sort. */
/* Acknowledge a pending stop reply that may have arrived in the
mean time. */
- if (pending_stop_reply != NULL)
- remote_get_pending_stop_replies ();
+ if (notif_client_stop.pending_event != NULL)
+ remote_notif_get_pending_events (¬if_client_stop);
/* If indeed we noticed a stop reply, we're done. */
stop_reply = queued_stop_reply (ptid);
/* Otherwise do a blocking wait. */
ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size,
- 1 /* forever */);
+ 1 /* forever */, &is_notif);
}
}
else
{
int ret;
+ int is_notif;
if (!target_is_async_p ())
{
_never_ wait for ever -> test on target_is_async_p().
However, before we do that we need to ensure that the caller
knows how to take the target into/out of async mode. */
- ret = getpkt_sane (&rs->buf, &rs->buf_size, wait_forever_enabled_p);
+ ret = getpkt_or_notif_sane (&rs->buf, &rs->buf_size,
+ wait_forever_enabled_p, &is_notif);
+
+ /* GDB gets a notification. Return to core as this event is
+ not interesting. */
+ if (ret != -1 && is_notif)
+ return minus_one_ptid;
+
if (!target_is_async_p ())
signal (SIGINT, ofunc);
}
break;
case 'T': case 'S': case 'X': case 'W':
{
- struct stop_reply *stop_reply;
- struct cleanup *old_chain;
+ struct stop_reply *stop_reply
+ = (struct stop_reply *) remote_notif_parse (¬if_client_stop,
+ rs->buf);
- stop_reply = stop_reply_xmalloc ();
- old_chain = make_cleanup (do_stop_reply_xfree, stop_reply);
- remote_parse_stop_reply (buf, stop_reply);
- discard_cleanups (old_chain);
event_ptid = process_stop_reply (stop_reply, status);
break;
}
{
/* If there are are events left in the queue tell the event loop
to return here. */
- if (stop_reply_queue)
+ if (!QUEUE_is_empty (stop_reply_p, stop_reply_queue))
mark_async_event_handler (remote_async_inferior_event_token);
}
/* Return what we have. Let higher layers handle partial reads. */
return i;
}
-\f
-
-/* Remote notification handler. */
-
-static void
-handle_notification (char *buf)
-{
- if (strncmp (buf, "Stop:", 5) == 0)
- {
- if (pending_stop_reply)
- {
- /* We've already parsed the in-flight stop-reply, but the
- stub for some reason thought we didn't, possibly due to
- timeout on its side. Just ignore it. */
- if (remote_debug)
- fprintf_unfiltered (gdb_stdlog, "ignoring resent notification\n");
- }
- else
- {
- struct cleanup *old_chain;
- struct stop_reply *reply = stop_reply_xmalloc ();
-
- old_chain = make_cleanup (do_stop_reply_xfree, reply);
-
- remote_parse_stop_reply (buf + 5, reply);
-
- discard_cleanups (old_chain);
-
- /* Be careful to only set it after parsing, since an error
- may be thrown then. */
- pending_stop_reply = reply;
-
- /* Notify the event loop there's a stop reply to acknowledge
- and that there may be more events to fetch. */
- mark_async_event_handler (remote_async_get_pending_events_token);
-
- if (remote_debug)
- fprintf_unfiltered (gdb_stdlog, "stop notification captured\n");
- }
- }
- else
- {
- /* We ignore notifications we don't recognize, for compatibility
- with newer stubs. */
- }
-}
\f
/* Read or write LEN bytes from inferior memory at MEMADDR,
0, this function is allowed to time out gracefully and return an
indication of this to the caller. Otherwise return the number of
bytes read. If EXPECTING_NOTIF, consider receiving a notification
- enough reason to return to the caller. */
+ enough reason to return to the caller. *IS_NOTIF is an output
+ boolean that indicates whether *BUF holds a notification or not
+ (a regular packet). */
static int
getpkt_or_notif_sane_1 (char **buf, long *sizeof_buf, int forever,
- int expecting_notif)
+ int expecting_notif, int *is_notif)
{
struct remote_state *rs = get_remote_state ();
int c;
/* Skip the ack char if we're in no-ack mode. */
if (!rs->noack_mode)
serial_write (remote_desc, "+", 1);
+ if (is_notif != NULL)
+ *is_notif = 0;
return val;
}
str);
do_cleanups (old_chain);
}
+ if (is_notif != NULL)
+ *is_notif = 1;
handle_notification (*buf);
/* Notifications require no acknowledgement. */
if (expecting_notif)
- return -1;
+ return val;
}
}
}
static int
getpkt_sane (char **buf, long *sizeof_buf, int forever)
{
- return getpkt_or_notif_sane_1 (buf, sizeof_buf, forever, 0);
+ return getpkt_or_notif_sane_1 (buf, sizeof_buf, forever, 0, NULL);
}
static int
-getpkt_or_notif_sane (char **buf, long *sizeof_buf, int forever)
+getpkt_or_notif_sane (char **buf, long *sizeof_buf, int forever,
+ int *is_notif)
{
- return getpkt_or_notif_sane_1 (buf, sizeof_buf, forever, 1);
+ return getpkt_or_notif_sane_1 (buf, sizeof_buf, forever, 1,
+ is_notif);
}
\f
connected. */
rs->waiting_for_stop_reply = 0;
- /* We're no longer interested in these events. */
- discard_pending_stop_replies (ptid_get_pid (inferior_ptid));
-
/* If the current general thread belonged to the process we just
detached from or has exited, the remote side current general
thread becomes undefined. Considering a case like this:
inferior_event_handler (INF_REG_EVENT, NULL);
}
-static void
-remote_async_get_pending_events_handler (gdb_client_data data)
-{
- remote_get_pending_stop_replies ();
-}
-
static void
remote_async (void (*callback) (enum inferior_event_type event_type,
void *context), void *context)
/* Hook into new objfile notification. */
observer_attach_new_objfile (remote_new_objfile);
+ /* We're no longer interested in notification events of an inferior
+ when it exits. */
+ observer_attach_inferior_exit (discard_pending_stop_replies);
/* Set up signal handlers. */
sigint_remote_token =
init_remote_threadtests ();
#endif
+ stop_reply_queue = QUEUE_alloc (stop_reply_p, stop_reply_xfree);
/* set/show remote ... */
add_prefix_cmd ("remote", class_maintenance, set_remote_cmd, _("\
projects / deliverable / binutils-gdb.git / blobdiff