mirror of
https://github.com/Gericom/teak-llvm.git
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5160ce5c72
LLDB is crashing when logging is enabled from lldb-perf-clang. This has to do with the global destructor chain as the process and its threads are being torn down. All logging channels now make one and only one instance that is kept in a global pointer which is never freed. This guarantees that logging can correctly continue as the process tears itself down. llvm-svn: 178191
252 lines
8.1 KiB
C++
252 lines
8.1 KiB
C++
//===-- ThreadGDBRemote.cpp -------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "ThreadGDBRemote.h"
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#include "lldb/Core/ArchSpec.h"
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/StreamString.h"
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#include "lldb/Core/State.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/StopInfo.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Unwind.h"
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#include "lldb/Breakpoint/Watchpoint.h"
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#include "ProcessGDBRemote.h"
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#include "ProcessGDBRemoteLog.h"
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#include "Utility/StringExtractorGDBRemote.h"
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using namespace lldb;
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using namespace lldb_private;
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//----------------------------------------------------------------------
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// Thread Registers
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//----------------------------------------------------------------------
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ThreadGDBRemote::ThreadGDBRemote (Process &process, lldb::tid_t tid) :
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Thread(process, tid),
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m_thread_name (),
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m_dispatch_queue_name (),
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m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS)
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{
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ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
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this,
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process.GetID(),
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GetID());
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}
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ThreadGDBRemote::~ThreadGDBRemote ()
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{
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ProcessSP process_sp(GetProcess());
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ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)",
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this,
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process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID,
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GetID());
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DestroyThread();
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}
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const char *
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ThreadGDBRemote::GetName ()
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{
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if (m_thread_name.empty())
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return NULL;
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return m_thread_name.c_str();
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}
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const char *
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ThreadGDBRemote::GetQueueName ()
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{
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// Always re-fetch the dispatch queue name since it can change
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if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS)
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{
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ProcessSP process_sp (GetProcess());
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if (process_sp)
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{
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ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
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return gdb_process->GetDispatchQueueNameForThread (m_thread_dispatch_qaddr, m_dispatch_queue_name);
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}
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}
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return NULL;
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}
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bool
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ThreadGDBRemote::WillResume (StateType resume_state)
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{
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// Call the Thread::WillResume first. If we stop at a signal, the stop info
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// class for signal will set the resume signal that we need below. The signal
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// stuff obeys the Process::UnixSignal defaults.
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// If the thread's WillResume returns false, that means that we aren't going to actually resume,
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// in which case we should not do the rest of our "resume" work.
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if (!Thread::WillResume(resume_state))
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return false;
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ClearStackFrames();
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int signo = GetResumeSignal();
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Log *log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD));
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if (log)
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log->Printf ("Resuming thread: %4.4" PRIx64 " with state: %s.", GetID(), StateAsCString(resume_state));
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ProcessSP process_sp (GetProcess());
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if (process_sp)
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{
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ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
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switch (resume_state)
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{
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case eStateSuspended:
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case eStateStopped:
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// Don't append anything for threads that should stay stopped.
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break;
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case eStateRunning:
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if (gdb_process->GetUnixSignals().SignalIsValid (signo))
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gdb_process->m_continue_C_tids.push_back(std::make_pair(GetID(), signo));
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else
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gdb_process->m_continue_c_tids.push_back(GetID());
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break;
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case eStateStepping:
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if (gdb_process->GetUnixSignals().SignalIsValid (signo))
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gdb_process->m_continue_S_tids.push_back(std::make_pair(GetID(), signo));
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else
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gdb_process->m_continue_s_tids.push_back(GetID());
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break;
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default:
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break;
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}
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return true;
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}
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return false;
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}
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void
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ThreadGDBRemote::RefreshStateAfterStop()
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{
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// Invalidate all registers in our register context. We don't set "force" to
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// true because the stop reply packet might have had some register values
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// that were expedited and these will already be copied into the register
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// context by the time this function gets called. The GDBRemoteRegisterContext
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// class has been made smart enough to detect when it needs to invalidate
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// which registers are valid by putting hooks in the register read and
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// register supply functions where they check the process stop ID and do
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// the right thing.
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const bool force = false;
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GetRegisterContext()->InvalidateIfNeeded (force);
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}
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void
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ThreadGDBRemote::ClearStackFrames ()
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{
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Unwind *unwinder = GetUnwinder ();
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if (unwinder)
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unwinder->Clear();
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Thread::ClearStackFrames();
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}
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bool
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ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread)
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{
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return thread != 0;
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}
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void
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ThreadGDBRemote::Dump(Log *log, uint32_t index)
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{
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}
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bool
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ThreadGDBRemote::ShouldStop (bool &step_more)
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{
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return true;
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}
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lldb::RegisterContextSP
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ThreadGDBRemote::GetRegisterContext ()
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{
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if (m_reg_context_sp.get() == NULL)
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m_reg_context_sp = CreateRegisterContextForFrame (NULL);
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return m_reg_context_sp;
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}
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lldb::RegisterContextSP
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ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame)
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{
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lldb::RegisterContextSP reg_ctx_sp;
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const bool read_all_registers_at_once = false;
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uint32_t concrete_frame_idx = 0;
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if (frame)
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concrete_frame_idx = frame->GetConcreteFrameIndex ();
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if (concrete_frame_idx == 0)
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{
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ProcessSP process_sp (GetProcess());
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if (process_sp)
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{
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ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
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reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once));
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}
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}
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else if (m_unwinder_ap.get())
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reg_ctx_sp = m_unwinder_ap->CreateRegisterContextForFrame (frame);
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return reg_ctx_sp;
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}
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bool
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ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response)
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{
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GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get());
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assert (gdb_reg_ctx);
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return gdb_reg_ctx->PrivateSetRegisterValue (reg, response);
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}
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lldb::StopInfoSP
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ThreadGDBRemote::GetPrivateStopReason ()
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{
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ProcessSP process_sp (GetProcess());
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if (process_sp)
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{
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const uint32_t process_stop_id = process_sp->GetStopID();
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if (m_thread_stop_reason_stop_id != process_stop_id ||
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(m_actual_stop_info_sp && !m_actual_stop_info_sp->IsValid()))
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{
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if (IsStillAtLastBreakpointHit())
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return m_actual_stop_info_sp;
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// If GetGDBProcess().SetThreadStopInfo() doesn't find a stop reason
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// for this thread, then m_actual_stop_info_sp will not ever contain
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// a valid stop reason and the "m_actual_stop_info_sp->IsValid() == false"
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// check will never be able to tell us if we have the correct stop info
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// for this thread and we will continually send qThreadStopInfo packets
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// down to the remote GDB server, so we need to keep our own notion
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// of the stop ID that m_actual_stop_info_sp is valid for (even if it
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// contains nothing). We use m_thread_stop_reason_stop_id for this below.
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m_thread_stop_reason_stop_id = process_stop_id;
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m_actual_stop_info_sp.reset();
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StringExtractorGDBRemote stop_packet;
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ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get());
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if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetID(), stop_packet))
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gdb_process->SetThreadStopInfo (stop_packet);
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}
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}
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return m_actual_stop_info_sp;
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}
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