/* See nat/windows-nat.h. */
-bool
-windows_process_info::matching_pending_stop (bool debug_events)
-{
- /* If there are pending stops, and we might plausibly hit one of
- them, we don't want to actually continue the inferior -- we just
- want to report the stop. In this case, we just pretend to
- continue. See the comment by the definition of "pending_stops"
- for details on why this is needed. */
- for (const auto &item : pending_stops)
- {
- if (desired_stop_thread_id == -1
- || desired_stop_thread_id == item.thread_id)
- {
- DEBUG_EVENTS ("pending stop anticipated, desired=0x%x, item=0x%x",
- desired_stop_thread_id, item.thread_id);
- return true;
- }
- }
-
- return false;
-}
-
-/* See nat/windows-nat.h. */
-
-std::optional<pending_stop>
-windows_process_info::fetch_pending_stop (bool debug_events)
-{
- std::optional<pending_stop> result;
- for (auto iter = pending_stops.begin ();
- iter != pending_stops.end ();
- ++iter)
- {
- if (desired_stop_thread_id == -1
- || desired_stop_thread_id == iter->thread_id)
- {
- result = *iter;
- current_event = iter->event;
-
- DEBUG_EVENTS ("pending stop found in 0x%x (desired=0x%x)",
- iter->thread_id, desired_stop_thread_id);
-
- pending_stops.erase (iter);
- break;
- }
- }
-
- return result;
-}
-
-/* See nat/windows-nat.h. */
-
BOOL
continue_last_debug_event (DWORD continue_status, bool debug_events)
{
namespace windows_nat
{
+/* Info about a potential pending stop. Each thread holds one of
+ these. See "windows_thread_info::pending_stop" for more
+ information. */
+struct pending_stop
+{
+ /* The target waitstatus we computed. TARGET_WAITKIND_IGNORE if the
+ thread does not have a pending stop. */
+ target_waitstatus status;
+
+ /* The event. A few fields of this can be referenced after a stop,
+ and it seemed simplest to store the entire event. */
+ DEBUG_EVENT event;
+};
+
+
/* Thread information structure used to track extra information about
each thread. */
struct windows_thread_info
was not. */
int suspended = 0;
+/* Info about a potential pending stop.
+
+ Sometimes, Windows will report a stop on a thread that has been
+ ostensibly suspended. We believe what happens here is that two
+ threads hit a breakpoint simultaneously, and the Windows kernel
+ queues the stop events. However, this can result in the strange
+ effect of trying to single step thread A -- leaving all other
+ threads suspended -- and then seeing a stop in thread B. To handle
+ this scenario, we queue all such "pending" stops here, and then
+ process them once the step has completed. See PR gdb/22992. */
+ struct pending_stop pending_stop {};
+
/* The context of the thread, including any manipulations. */
union
{
gdb::unique_xmalloc_ptr<char> name;
};
-
-/* A single pending stop. See "pending_stops" for more
- information. */
-struct pending_stop
-{
- /* The thread id. */
- DWORD thread_id;
-
- /* The target waitstatus we computed. */
- target_waitstatus status;
-
- /* The event. A few fields of this can be referenced after a stop,
- and it seemed simplest to store the entire event. */
- DEBUG_EVENT event;
-};
-
enum handle_exception_result
{
HANDLE_EXCEPTION_UNHANDLED = 0,
stop. */
DEBUG_EVENT current_event {};
- /* The ID of the thread for which we anticipate a stop event.
- Normally this is -1, meaning we'll accept an event in any
- thread. */
- DWORD desired_stop_thread_id = -1;
-
- /* A vector of pending stops. Sometimes, Windows will report a stop
- on a thread that has been ostensibly suspended. We believe what
- happens here is that two threads hit a breakpoint simultaneously,
- and the Windows kernel queues the stop events. However, this can
- result in the strange effect of trying to single step thread A --
- leaving all other threads suspended -- and then seeing a stop in
- thread B. To handle this scenario, we queue all such "pending"
- stops here, and then process them once the step has completed. See
- PR gdb/22992. */
- std::vector<pending_stop> pending_stops;
-
/* Contents of $_siginfo */
EXCEPTION_RECORD siginfo_er {};
void add_all_dlls ();
- /* Return true if there is a pending stop matching
- desired_stop_thread_id. If DEBUG_EVENTS is true, logging will be
- enabled. */
-
- bool matching_pending_stop (bool debug_events);
-
- /* See if a pending stop matches DESIRED_STOP_THREAD_ID. If so,
- remove it from the list of pending stops, set 'current_event', and
- return it. Otherwise, return an empty optional. */
-
- std::optional<pending_stop> fetch_pending_stop (bool debug_events);
-
const char *pid_to_exec_file (int);
template<typename Function>
windows_nat_target::windows_continue (DWORD continue_status, int id,
windows_continue_flags cont_flags)
{
- windows_process.desired_stop_thread_id = id;
-
- if (windows_process.matching_pending_stop (debug_events))
+ for (auto &th : windows_process.thread_list)
{
- /* There's no need to really continue, because there's already
- another event pending. However, we do need to inform the
- event loop of this. */
- serial_event_set (m_wait_event);
- return TRUE;
+ if ((id == -1 || id == (int) th->tid)
+ && !th->suspended
+ && th->pending_stop.status.kind () != TARGET_WAITKIND_IGNORE)
+ {
+ DEBUG_EVENTS ("got matching pending stop event "
+ "for 0x%x, not resuming",
+ th->tid);
+
+ /* There's no need to really continue, because there's already
+ another event pending. However, we do need to inform the
+ event loop of this. */
+ serial_event_set (m_wait_event);
+ return TRUE;
+ }
}
for (auto &th : windows_process.thread_list)
DWORD thread_id = 0;
/* If there is a relevant pending stop, report it now. See the
- comment by the definition of "pending_stops" for details on why
- this is needed. */
- std::optional<pending_stop> stop
- = windows_process.fetch_pending_stop (debug_events);
- if (stop.has_value ())
+ comment by the definition of "windows_thread_info::pending_stop"
+ for details on why this is needed. */
+ for (auto &th : windows_process.thread_list)
{
- thread_id = stop->thread_id;
- *ourstatus = stop->status;
- windows_process.current_event = stop->event;
+ if (!th->suspended
+ && th->pending_stop.status.kind () != TARGET_WAITKIND_IGNORE)
+ {
+ DEBUG_EVENTS ("reporting pending event for 0x%x", th->tid);
+
+ thread_id = th->tid;
+ *ourstatus = th->pending_stop.status;
+ th->pending_stop.status.set_ignore ();
+ windows_process.current_event = th->pending_stop.event;
- ptid_t ptid (windows_process.current_event.dwProcessId, thread_id);
- windows_thread_info *th = windows_process.find_thread (ptid);
- if (th != nullptr)
- windows_process.invalidate_context (th);
- return ptid;
+ ptid_t ptid (windows_process.process_id, thread_id);
+ windows_process.invalidate_context (th.get ());
+ return ptid;
+ }
}
windows_process.last_sig = GDB_SIGNAL_0;
}
/* Record the existence of this thread. */
thread_id = current_event->dwThreadId;
- add_thread
- (ptid_t (current_event->dwProcessId, current_event->dwThreadId, 0),
- current_event->u.CreateThread.hThread,
- current_event->u.CreateThread.lpThreadLocalBase,
- false /* main_thread_p */);
+ {
+ windows_thread_info *th
+ = (add_thread
+ (ptid_t (current_event->dwProcessId, current_event->dwThreadId, 0),
+ current_event->u.CreateThread.hThread,
+ current_event->u.CreateThread.lpThreadLocalBase,
+ false /* main_thread_p */));
+
+ /* This updates debug registers if necessary. */
+ windows_process.continue_one_thread (th, 0);
+ }
break;
case EXIT_THREAD_DEBUG_EVENT:
current_event->dwThreadId, 0),
current_event->u.ExitThread.dwExitCode,
false /* main_thread_p */);
+ thread_id = 0;
break;
case CREATE_PROCESS_DEBUG_EVENT:
ourstatus->set_exited (exit_status);
else
ourstatus->set_signalled (gdb_signal_from_host (exit_signal));
-
- thread_id = current_event->dwThreadId;
+ return ptid_t (current_event->dwProcessId);
}
break;
if (!thread_id || windows_process.saw_create != 1)
{
- CHECK (windows_continue (continue_status,
- windows_process.desired_stop_thread_id, 0));
+ continue_last_debug_event_main_thread
+ (_("Failed to resume program execution"), continue_status);
+ ourstatus->set_ignore ();
+ return null_ptid;
}
- else if (windows_process.desired_stop_thread_id != -1
- && windows_process.desired_stop_thread_id != thread_id)
+
+ const ptid_t ptid = ptid_t (current_event->dwProcessId, thread_id, 0);
+ windows_thread_info *th = windows_process.find_thread (ptid);
+
+ if (th->suspended)
{
/* Pending stop. See the comment by the definition of
"pending_stops" for details on why this is needed. */
DEBUG_EVENTS ("get_windows_debug_event - "
- "unexpected stop in 0x%x (expecting 0x%x)",
- thread_id, windows_process.desired_stop_thread_id);
+ "unexpected stop in suspended thread 0x%x",
+ thread_id);
if (current_event->dwDebugEventCode == EXCEPTION_DEBUG_EVENT
&& ((current_event->u.Exception.ExceptionRecord.ExceptionCode
== STATUS_WX86_BREAKPOINT))
&& windows_process.windows_initialization_done)
{
- ptid_t ptid = ptid_t (current_event->dwProcessId, thread_id, 0);
- windows_thread_info *th = windows_process.find_thread (ptid);
th->stopped_at_software_breakpoint = true;
th->pc_adjusted = false;
}
- windows_process.pending_stops.push_back
- ({thread_id, *ourstatus, windows_process.current_event});
- thread_id = 0;
- CHECK (windows_continue (continue_status,
- windows_process.desired_stop_thread_id, 0));
- }
-
- if (thread_id == 0)
- {
+ th->pending_stop.status = *ourstatus;
+ th->pending_stop.event = *current_event;
ourstatus->set_ignore ();
+
+ continue_last_debug_event_main_thread
+ (_("Failed to resume program execution"), continue_status);
return null_ptid;
}
- return ptid_t (windows_process.current_event.dwProcessId, thread_id, 0);
+
+ return ptid;
}
/* Wait for interesting events to occur in the target process. */
if (ourstatus->kind () == TARGET_WAITKIND_SPURIOUS)
{
- CHECK (windows_continue (DBG_CONTINUE,
- windows_process.desired_stop_thread_id, 0));
+ continue_last_debug_event_main_thread
+ (_("Failed to resume program execution"), DBG_CONTINUE);
}
else if (ourstatus->kind () != TARGET_WAITKIND_IGNORE)
{
static BOOL
child_continue (DWORD continue_status, int thread_id)
{
- windows_process.desired_stop_thread_id = thread_id;
- if (windows_process.matching_pending_stop (debug_threads))
- return TRUE;
+ process_info *proc = find_process_pid (windows_process.process_id);
+ for (thread_info &thread : proc->thread_list ())
+ {
+ auto *th = static_cast<windows_thread_info *> (thread.target_data ());
+ if ((thread_id == -1 || thread_id == (int) th->tid)
+ && !th->suspended
+ && th->pending_stop.status.kind () != TARGET_WAITKIND_IGNORE)
+ return TRUE;
+ }
/* The inferior will only continue after the ContinueDebugEvent
call. */
windows_process.attaching = 0;
{
- std::optional<pending_stop> stop
- = windows_process.fetch_pending_stop (debug_threads);
- if (stop.has_value ())
+ process_info *proc = find_process_pid (windows_process.process_id);
+ for (thread_info &thread : proc->thread_list ())
{
- *ourstatus = stop->status;
- windows_process.current_event = stop->event;
- ptid = debug_event_ptid (&windows_process.current_event);
- switch_to_thread (find_thread_ptid (ptid));
- return 1;
+ auto *th = static_cast<windows_thread_info *> (thread.target_data ());
+
+ if (!th->suspended
+ && th->pending_stop.status.kind () != TARGET_WAITKIND_IGNORE)
+ {
+ *ourstatus = th->pending_stop.status;
+ th->pending_stop.status.set_ignore ();
+ windows_process.current_event = th->pending_stop.event;
+ ptid = debug_event_ptid (&windows_process.current_event);
+ switch_to_thread (find_thread_ptid (ptid));
+ return 1;
+ }
}
/* Keep the wait time low enough for comfortable remote
else
ourstatus->set_signalled (gdb_signal_from_host (exit_signal));
}
- child_continue (DBG_CONTINUE, windows_process.desired_stop_thread_id);
+ continue_last_debug_event (DBG_CONTINUE, debug_threads);
break;
case LOAD_DLL_DEBUG_EVENT:
ptid = debug_event_ptid (&windows_process.current_event);
- if (windows_process.desired_stop_thread_id != -1
- && windows_process.desired_stop_thread_id != ptid.lwp ())
+ windows_thread_info *th = windows_process.find_thread (ptid);
+
+ if (th != nullptr && th->suspended)
{
/* Pending stop. See the comment by the definition of
- "pending_stops" for details on why this is needed. */
+ "windows_thread_info::pending_stop" for details on why this
+ is needed. */
OUTMSG2 (("get_windows_debug_event - "
- "unexpected stop in 0x%lx (expecting 0x%x)\n",
- ptid.lwp (), windows_process.desired_stop_thread_id));
+ "unexpected stop in suspended thread 0x%x\n",
+ th->tid));
maybe_adjust_pc ();
- windows_process.pending_stops.push_back
- ({(DWORD) ptid.lwp (), *ourstatus, *current_event});
+ th->pending_stop.status = *ourstatus;
+ th->pending_stop.event = *current_event;
ourstatus->set_spurious ();
}
else
[[fallthrough]];
case TARGET_WAITKIND_SPURIOUS:
/* do nothing, just continue */
- child_continue (continue_status,
- windows_process.desired_stop_thread_id);
+ continue_last_debug_event (continue_status, debug_threads);
break;
}
}
projects / thirdparty / binutils-gdb.git / commitdiff
