bool ProcessFreeBSD::IsSoftwareStepBreakpoint(lldb::tid_t tid) {
ThreadSP thread = GetThreadList().FindThreadByID(tid);
if (!thread)
return false;
assert(thread->GetRegisterContext());
lldb::addr_t stop_pc = thread->GetRegisterContext()->GetPC();
const auto &iter = m_threads_stepping_with_breakpoint.find(tid);
if (iter == m_threads_stepping_with_breakpoint.end())
return false;
lldb::break_id_t bp_id = iter->second;
BreakpointSP bp = GetTarget().GetBreakpointByID(bp_id);
if (!bp)
return false;
BreakpointLocationSP bp_loc = bp->FindLocationByAddress(stop_pc);
if (!bp_loc)
return false;
GetTarget().RemoveBreakpointByID(bp_id);
m_threads_stepping_with_breakpoint.erase(tid);
return true;
}
ThreadSP
SystemRuntimeMacOSX::GetExtendedBacktraceThread (ThreadSP real_thread, ConstString type)
{
ThreadSP originating_thread_sp;
if (BacktraceRecordingHeadersInitialized() && type == ConstString ("libdispatch"))
{
Error error;
// real_thread is either an actual, live thread (in which case we need to call into
// libBacktraceRecording to find its originator) or it is an extended backtrace itself,
// in which case we get the token from it and call into libBacktraceRecording to find
// the originator of that token.
if (real_thread->GetExtendedBacktraceToken() != LLDB_INVALID_ADDRESS)
{
originating_thread_sp = GetExtendedBacktraceFromItemRef (real_thread->GetExtendedBacktraceToken());
}
else
{
ThreadSP cur_thread_sp (m_process->GetThreadList().GetSelectedThread());
AppleGetThreadItemInfoHandler::GetThreadItemInfoReturnInfo ret = m_get_thread_item_info_handler.GetThreadItemInfo (*cur_thread_sp.get(), real_thread->GetID(), m_page_to_free, m_page_to_free_size, error);
m_page_to_free = LLDB_INVALID_ADDRESS;
m_page_to_free_size = 0;
if (ret.item_buffer_ptr != 0 && ret.item_buffer_ptr != LLDB_INVALID_ADDRESS && ret.item_buffer_size > 0)
{
DataBufferHeap data (ret.item_buffer_size, 0);
if (m_process->ReadMemory (ret.item_buffer_ptr, data.GetBytes(), ret.item_buffer_size, error) && error.Success())
{
DataExtractor extractor (data.GetBytes(), data.GetByteSize(), m_process->GetByteOrder(), m_process->GetAddressByteSize());
ItemInfo item = ExtractItemInfoFromBuffer (extractor);
bool stop_id_is_valid = true;
if (item.stop_id == 0)
stop_id_is_valid = false;
originating_thread_sp.reset (new HistoryThread (*m_process,
item.enqueuing_thread_id,
item.enqueuing_callstack,
item.stop_id,
stop_id_is_valid));
originating_thread_sp->SetExtendedBacktraceToken (item.item_that_enqueued_this);
originating_thread_sp->SetQueueName (item.enqueuing_queue_label.c_str());
originating_thread_sp->SetQueueID (item.enqueuing_queue_serialnum);
// originating_thread_sp->SetThreadName (item.enqueuing_thread_label.c_str());
}
m_page_to_free = ret.item_buffer_ptr;
m_page_to_free_size = ret.item_buffer_size;
}
}
}
return originating_thread_sp;
}
bool
SystemRuntimeMacOSX::SafeToCallFunctionsOnThisThread (ThreadSP thread_sp)
{
if (thread_sp && thread_sp->GetStackFrameCount() > 0 && thread_sp->GetFrameWithConcreteFrameIndex(0))
{
const SymbolContext sym_ctx (thread_sp->GetFrameWithConcreteFrameIndex(0)->GetSymbolContext (eSymbolContextSymbol));
static ConstString g_select_symbol ("__select");
if (sym_ctx.GetFunctionName() == g_select_symbol)
{
return false;
}
}
return true;
}
addr_t
SystemRuntimeMacOSX::GetThreadCreatorItem (ThreadSP thread_sp)
{
addr_t enqueued_item_ptr = thread_sp->GetExtendedBacktraceToken();
if (enqueued_item_ptr == LLDB_INVALID_ADDRESS)
{
if (thread_sp->GetQueueID() == LLDB_INVALID_QUEUE_ID || thread_sp->GetQueueID() == 0)
return LLDB_INVALID_ADDRESS;
Error error;
uint64_t this_thread_queue_id = thread_sp->GetQueueID();
addr_t queues_head = GetQueuesHead();
if (queues_head == LLDB_INVALID_ADDRESS)
return LLDB_INVALID_ADDRESS;
// Step through the queues_head linked list looking for a queue matching this thread, if any
uint64_t queue_obj_ptr = queues_head;
enqueued_item_ptr = LLDB_INVALID_ADDRESS;
while (queue_obj_ptr != 0)
{
uint64_t queue_id = m_process->ReadUnsignedIntegerFromMemory (queue_obj_ptr + m_ldi_header.queue_offsets.queue_id, 8, LLDB_INVALID_ADDRESS, error);
if (error.Success() && queue_id != LLDB_INVALID_ADDRESS)
{
if (queue_id == this_thread_queue_id)
{
enqueued_item_ptr = m_process->ReadPointerFromMemory (queue_obj_ptr + m_ldi_header.queue_offsets.current_item_ptr, error);
break;
}
}
queue_obj_ptr = m_process->ReadPointerFromMemory (queue_obj_ptr + m_ldi_header.queue_offsets.next, error);
if (error.Success() == false || queue_obj_ptr == LLDB_INVALID_ADDRESS)
{
break;
}
}
}
return enqueued_item_ptr;
}
void
SystemRuntimeMacOSX::SetNewThreadExtendedBacktraceToken (ThreadSP original_thread_sp, ThreadSP new_extended_thread_sp)
{
addr_t enqueued_item_ptr = GetThreadCreatorItem (original_thread_sp);
if (enqueued_item_ptr != LLDB_INVALID_ADDRESS)
{
Error error;
uint64_t further_extended_backtrace = m_process->ReadPointerFromMemory (enqueued_item_ptr + m_ldi_header.item_offsets.enqueueing_thread_dispatch_block_ptr, error);
if (error.Success() && further_extended_backtrace != 0 && further_extended_backtrace != LLDB_INVALID_ADDRESS)
{
new_extended_thread_sp->SetExtendedBacktraceToken (further_extended_backtrace);
}
}
}
void
ThreadCollection::AddThreadSortedByIndexID (const ThreadSP &thread_sp)
{
std::lock_guard<std::recursive_mutex> guard(GetMutex());
// Make sure we always keep the threads sorted by thread index ID
const uint32_t thread_index_id = thread_sp->GetIndexID();
if (m_threads.empty() || m_threads.back()->GetIndexID() < thread_index_id)
m_threads.push_back (thread_sp);
else
{
m_threads.insert(std::upper_bound(m_threads.begin(), m_threads.end(), thread_sp,
[] (const ThreadSP &lhs, const ThreadSP &rhs) -> bool
{
return lhs->GetIndexID() < rhs->GetIndexID();
}), thread_sp);
}
}
void
SystemRuntimeMacOSX::SetNewThreadQueueID (ThreadSP original_thread_sp, ThreadSP new_extended_thread_sp)
{
queue_id_t queue_id = LLDB_INVALID_QUEUE_ID;
addr_t enqueued_item_ptr = GetThreadCreatorItem (original_thread_sp);
if (enqueued_item_ptr != LLDB_INVALID_ADDRESS && m_ldi_header.item_offsets.queue_id_from_thread_info != 0xffff)
{
Error error;
queue_id = m_process->ReadUnsignedIntegerFromMemory (enqueued_item_ptr + m_ldi_header.item_offsets.queue_id_from_thread_info, 8, LLDB_INVALID_QUEUE_ID, error);
if (!error.Success())
queue_id = LLDB_INVALID_QUEUE_ID;
}
if (queue_id != LLDB_INVALID_QUEUE_ID)
{
new_extended_thread_sp->SetQueueID (queue_id);
}
}
void
SystemRuntimeMacOSX::SetNewThreadThreadName (ThreadSP original_thread_sp, ThreadSP new_extended_thread_sp)
{
addr_t enqueued_item_ptr = GetThreadCreatorItem (original_thread_sp);
if (enqueued_item_ptr != LLDB_INVALID_ADDRESS)
{
Error error;
addr_t thread_name_ptr = m_process->ReadPointerFromMemory (enqueued_item_ptr + m_ldi_header.item_offsets.thread_name_ptr, error);
if (thread_name_ptr != LLDB_INVALID_ADDRESS && error.Success())
{
char namebuf[512];
if (m_process->ReadCStringFromMemory (thread_name_ptr, namebuf, sizeof (namebuf), error) > 0 && error.Success())
{
new_extended_thread_sp->SetName (namebuf);
}
}
}
}
bool
OperatingSystemGo::UpdateThreadList(ThreadList &old_thread_list, ThreadList &real_thread_list,
ThreadList &new_thread_list)
{
new_thread_list = real_thread_list;
Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_OS));
if (!(m_allg_sp || Init(real_thread_list)) || (m_allg_sp && !m_allglen_sp) ||
!GetGlobalPluginProperties()->GetEnableGoroutines())
{
return new_thread_list.GetSize(false) > 0;
}
if (log)
log->Printf("OperatingSystemGo::UpdateThreadList(%d, %d, %d) fetching thread data from Go for pid %" PRIu64,
old_thread_list.GetSize(false), real_thread_list.GetSize(false), new_thread_list.GetSize(0),
m_process->GetID());
uint64_t allglen = m_allglen_sp->GetValueAsUnsigned(0);
if (allglen == 0)
{
return new_thread_list.GetSize(false) > 0;
}
std::vector<Goroutine> goroutines;
// The threads that are in "new_thread_list" upon entry are the threads from the
// lldb_private::Process subclass, no memory threads will be in this list.
Error err;
for (uint64_t i = 0; i < allglen; ++i)
{
goroutines.push_back(CreateGoroutineAtIndex(i, err));
if (err.Fail())
{
err.PutToLog(log, "OperatingSystemGo::UpdateThreadList");
return new_thread_list.GetSize(false) > 0;
}
}
// Make a map so we can match goroutines with backing threads.
std::map<uint64_t, ThreadSP> stack_map;
for (uint32_t i = 0; i < real_thread_list.GetSize(false); ++i)
{
ThreadSP thread = real_thread_list.GetThreadAtIndex(i, false);
stack_map[thread->GetRegisterContext()->GetSP()] = thread;
}
for (const Goroutine &goroutine : goroutines)
{
if (0 /* Gidle */ == goroutine.m_status || 6 /* Gdead */ == goroutine.m_status)
{
continue;
}
ThreadSP memory_thread = old_thread_list.FindThreadByID(goroutine.m_goid, false);
if (memory_thread && IsOperatingSystemPluginThread(memory_thread) && memory_thread->IsValid())
{
memory_thread->ClearBackingThread();
}
else
{
memory_thread.reset(new ThreadMemory(*m_process, goroutine.m_goid, nullptr, nullptr, goroutine.m_gobuf));
}
// Search for the backing thread if the goroutine is running.
if (2 == (goroutine.m_status & 0xfff))
{
auto backing_it = stack_map.lower_bound(goroutine.m_lostack);
if (backing_it != stack_map.end())
{
if (goroutine.m_histack >= backing_it->first)
{
if (log)
log->Printf("OperatingSystemGo::UpdateThreadList found backing thread %" PRIx64 " (%" PRIx64
") for thread %" PRIx64 "",
backing_it->second->GetID(), backing_it->second->GetProtocolID(),
memory_thread->GetID());
memory_thread->SetBackingThread(backing_it->second);
new_thread_list.RemoveThreadByID(backing_it->second->GetID(), false);
}
}
}
new_thread_list.AddThread(memory_thread);
}
return new_thread_list.GetSize(false) > 0;
}
