Error
ProcessPOSIX::DoDetach(bool keep_stopped)
{
Error error;
if (keep_stopped)
{
// FIXME: If you want to implement keep_stopped,
// this would be the place to do it.
error.SetErrorString("Detaching with keep_stopped true is not currently supported on this platform.");
return error;
}
Mutex::Locker lock(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i)
{
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.GetThreadAtIndex(i, false).get());
error = m_monitor->Detach(thread->GetID());
}
if (error.Success())
SetPrivateState(eStateDetached);
return error;
}
// ProcessPOSIX override
void
ProcessLinux::StopAllThreads(lldb::tid_t stop_tid)
{
// If a breakpoint occurs while we're stopping threads, we'll get back
// here, but we don't want to do it again. Only the MonitorChildProcess
// thread calls this function, so we don't need to protect this flag.
if (m_stopping_threads)
return;
m_stopping_threads = true;
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS));
if (log)
log->Printf ("ProcessLinux::%s() stopping all threads", __FUNCTION__);
// Walk the thread list and stop the other threads. The thread that caused
// the stop should already be marked as stopped before we get here.
Mutex::Locker thread_list_lock(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i)
{
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.GetThreadAtIndex(i, false).get());
assert(thread);
lldb::tid_t tid = thread->GetID();
if (!StateIsStoppedState(thread->GetState(), false))
m_monitor->StopThread(tid);
}
m_stopping_threads = false;
if (log)
log->Printf ("ProcessLinux::%s() finished", __FUNCTION__);
}
void
ProcessPOSIX::RefreshStateAfterStop()
{
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS));
if (log && log->GetMask().Test(POSIX_LOG_VERBOSE))
log->Printf ("ProcessPOSIX::%s(), message_queue size = %d", __FUNCTION__, (int)m_message_queue.size());
Mutex::Locker lock(m_message_mutex);
// This method used to only handle one message. Changing it to loop allows
// it to handle the case where we hit a breakpoint while handling a different
// breakpoint.
while (!m_message_queue.empty())
{
ProcessMessage &message = m_message_queue.front();
// Resolve the thread this message corresponds to and pass it along.
lldb::tid_t tid = message.GetTID();
if (log)
log->Printf ("ProcessPOSIX::%s(), message_queue size = %d, pid = %" PRIi64, __FUNCTION__, (int)m_message_queue.size(), tid);
if (message.GetKind() == ProcessMessage::eNewThreadMessage)
{
if (log)
log->Printf ("ProcessPOSIX::%s() adding thread, tid = %" PRIi64, __FUNCTION__, message.GetChildTID());
lldb::tid_t child_tid = message.GetChildTID();
ThreadSP thread_sp;
thread_sp.reset(CreateNewPOSIXThread(*this, child_tid));
Mutex::Locker lock(m_thread_list.GetMutex());
m_thread_list.AddThread(thread_sp);
}
m_thread_list.RefreshStateAfterStop();
POSIXThread *thread = static_cast<POSIXThread*>(
GetThreadList().FindThreadByID(tid, false).get());
if (thread)
thread->Notify(message);
if (message.GetKind() == ProcessMessage::eExitMessage)
{
// FIXME: We should tell the user about this, but the limbo message is probably better for that.
if (log)
log->Printf ("ProcessPOSIX::%s() removing thread, tid = %" PRIi64, __FUNCTION__, tid);
Mutex::Locker lock(m_thread_list.GetMutex());
ThreadSP thread_sp = m_thread_list.RemoveThreadByID(tid, false);
thread_sp.reset();
m_seen_initial_stop.erase(tid);
}
m_message_queue.pop();
}
}
Error
ProcessPOSIX::GetWatchpointSupportInfo(uint32_t &num)
{
Error error;
Mutex::Locker lock(m_thread_list.GetMutex());
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.GetThreadAtIndex(0, false).get());
if (thread)
num = thread->NumSupportedHardwareWatchpoints();
else
error.SetErrorString("Process does not exist.");
return error;
}
Error
ProcessPOSIX::DisableWatchpoint(Watchpoint *wp, bool notify)
{
Error error;
if (wp)
{
user_id_t watchID = wp->GetID();
addr_t addr = wp->GetLoadAddress();
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_WATCHPOINTS));
if (log)
log->Printf("ProcessPOSIX::DisableWatchpoint(watchID = %" PRIu64 ")",
watchID);
if (!wp->IsEnabled())
{
if (log)
log->Printf("ProcessPOSIX::DisableWatchpoint(watchID = %" PRIu64
") addr = 0x%8.8" PRIx64 ": watchpoint already disabled.",
watchID, (uint64_t)addr);
// This is needed (for now) to keep watchpoints disabled correctly
wp->SetEnabled(false, notify);
return error;
}
if (wp->IsHardware())
{
bool wp_disabled = true;
Mutex::Locker lock(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i)
{
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.GetThreadAtIndex(i, false).get());
if (thread)
wp_disabled &= thread->DisableHardwareWatchpoint(wp);
else
wp_disabled = false;
}
if (wp_disabled)
{
wp->SetHardwareIndex(LLDB_INVALID_INDEX32);
wp->SetEnabled(false, notify);
return error;
}
else
error.SetErrorString("Disabling hardware watchpoint failed");
}
}
else
error.SetErrorString("Watchpoint argument was NULL.");
return error;
}
bool
ProcessPOSIX::IsAThreadRunning()
{
bool is_running = false;
Mutex::Locker lock(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i)
{
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.GetThreadAtIndex(i, false).get());
StateType thread_state = thread->GetState();
if (thread_state == eStateRunning || thread_state == eStateStepping)
{
is_running = true;
break;
}
}
return is_running;
}
Error
ProcessPOSIX::DoResume()
{
StateType state = GetPrivateState();
assert(state == eStateStopped);
SetPrivateState(eStateRunning);
bool did_resume = false;
Mutex::Locker lock(m_thread_list.GetMutex());
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i)
{
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.GetThreadAtIndex(i, false).get());
did_resume = thread->Resume() || did_resume;
}
assert(did_resume && "Process resume failed!");
return Error();
}
Error
ProcessPOSIX::EnableWatchpoint(Watchpoint *wp, bool notify)
{
Error error;
if (wp)
{
user_id_t watchID = wp->GetID();
addr_t addr = wp->GetLoadAddress();
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_WATCHPOINTS));
if (log)
log->Printf ("ProcessPOSIX::EnableWatchpoint(watchID = %" PRIu64 ")",
watchID);
if (wp->IsEnabled())
{
if (log)
log->Printf("ProcessPOSIX::EnableWatchpoint(watchID = %" PRIu64
") addr = 0x%8.8" PRIx64 ": watchpoint already enabled.",
watchID, (uint64_t)addr);
return error;
}
// Try to find a vacant watchpoint slot in the inferiors' main thread
uint32_t wp_hw_index = LLDB_INVALID_INDEX32;
Mutex::Locker lock(m_thread_list.GetMutex());
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.GetThreadAtIndex(0, false).get());
if (thread)
wp_hw_index = thread->FindVacantWatchpointIndex();
if (wp_hw_index == LLDB_INVALID_INDEX32)
{
error.SetErrorString("Setting hardware watchpoint failed.");
}
else
{
wp->SetHardwareIndex(wp_hw_index);
bool wp_enabled = true;
uint32_t thread_count = m_thread_list.GetSize(false);
for (uint32_t i = 0; i < thread_count; ++i)
{
thread = static_cast<POSIXThread*>(
m_thread_list.GetThreadAtIndex(i, false).get());
if (thread)
wp_enabled &= thread->EnableHardwareWatchpoint(wp);
else
wp_enabled = false;
}
if (wp_enabled)
{
wp->SetEnabled(true, notify);
return error;
}
else
{
// Watchpoint enabling failed on at least one
// of the threads so roll back all of them
DisableWatchpoint(wp, false);
error.SetErrorString("Setting hardware watchpoint failed");
}
}
}
else
error.SetErrorString("Watchpoint argument was NULL.");
return error;
}
void
ProcessPOSIX::SendMessage(const ProcessMessage &message)
{
Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS));
Mutex::Locker lock(m_message_mutex);
Mutex::Locker thread_lock(m_thread_list.GetMutex());
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.FindThreadByID(message.GetTID(), false).get());
switch (message.GetKind())
{
case ProcessMessage::eInvalidMessage:
return;
case ProcessMessage::eAttachMessage:
SetPrivateState(eStateStopped);
return;
case ProcessMessage::eLimboMessage:
assert(thread);
thread->SetState(eStateStopped);
if (message.GetTID() == GetID())
{
m_exit_status = message.GetExitStatus();
if (m_exit_now)
{
SetPrivateState(eStateExited);
m_monitor->Detach(GetID());
}
else
{
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
}
}
else
{
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
}
break;
case ProcessMessage::eExitMessage:
if (thread != nullptr)
thread->SetState(eStateExited);
else
{
if (log)
log->Warning ("ProcessPOSIX::%s eExitMessage for TID %" PRIu64 " failed to find a thread to mark as eStateExited, ignoring", __FUNCTION__, message.GetTID ());
}
// FIXME: I'm not sure we need to do this.
if (message.GetTID() == GetID())
{
SetExitStatus(message.GetExitStatus(), NULL);
}
else if (!IsAThreadRunning())
SetPrivateState(eStateStopped);
break;
case ProcessMessage::eSignalMessage:
case ProcessMessage::eSignalDeliveredMessage:
if (message.GetSignal() == SIGSTOP &&
AddThreadForInitialStopIfNeeded(message.GetTID()))
return;
// Intentional fall-through
case ProcessMessage::eBreakpointMessage:
case ProcessMessage::eTraceMessage:
case ProcessMessage::eWatchpointMessage:
case ProcessMessage::eCrashMessage:
assert(thread);
thread->SetState(eStateStopped);
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
break;
case ProcessMessage::eNewThreadMessage:
{
lldb::tid_t new_tid = message.GetChildTID();
if (WaitingForInitialStop(new_tid))
{
m_monitor->WaitForInitialTIDStop(new_tid);
}
assert(thread);
thread->SetState(eStateStopped);
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
break;
}
case ProcessMessage::eExecMessage:
{
assert(thread);
thread->SetState(eStateStopped);
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
break;
}
}
m_message_queue.push(message);
}
void
ProcessPOSIX::SendMessage(const ProcessMessage &message)
{
Mutex::Locker lock(m_message_mutex);
Mutex::Locker thread_lock(m_thread_list.GetMutex());
POSIXThread *thread = static_cast<POSIXThread*>(
m_thread_list.FindThreadByID(message.GetTID(), false).get());
switch (message.GetKind())
{
case ProcessMessage::eInvalidMessage:
return;
case ProcessMessage::eLimboMessage:
assert(thread);
thread->SetState(eStateStopped);
if (message.GetTID() == GetID())
{
m_exit_status = message.GetExitStatus();
if (m_exit_now)
{
SetPrivateState(eStateExited);
m_monitor->Detach(GetID());
}
else
{
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
}
}
else
{
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
}
break;
case ProcessMessage::eExitMessage:
assert(thread);
thread->SetState(eStateExited);
// FIXME: I'm not sure we need to do this.
if (message.GetTID() == GetID())
{
m_exit_status = message.GetExitStatus();
SetExitStatus(m_exit_status, NULL);
}
else if (!IsAThreadRunning())
SetPrivateState(eStateStopped);
break;
assert(thread);
thread->SetState(eStateStopped);
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
break;
case ProcessMessage::eSignalMessage:
case ProcessMessage::eSignalDeliveredMessage:
if (message.GetSignal() == SIGSTOP &&
AddThreadForInitialStopIfNeeded(message.GetTID()))
return;
// Intentional fall-through
case ProcessMessage::eBreakpointMessage:
case ProcessMessage::eTraceMessage:
case ProcessMessage::eWatchpointMessage:
case ProcessMessage::eNewThreadMessage:
case ProcessMessage::eCrashMessage:
assert(thread);
thread->SetState(eStateStopped);
StopAllThreads(message.GetTID());
SetPrivateState(eStateStopped);
break;
}
m_message_queue.push(message);
}
POSIXThread* POSIXThread__New_1(::uStatic* __this, ::uDelegate* callback)
{
POSIXThread* inst = (POSIXThread*)::uAllocObject(sizeof(POSIXThread), POSIXThread__typeof());
inst->_ObjInit_1(callback);
return inst;
}
