| //===-- ThreadGDBRemote.cpp -------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| |
| #include "ThreadGDBRemote.h" |
| |
| #include "lldb/Core/ArchSpec.h" |
| #include "lldb/Core/DataExtractor.h" |
| #include "lldb/Core/StreamString.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/RegisterContext.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Unwind.h" |
| #include "lldb/Breakpoint/WatchpointLocation.h" |
| |
| #include "LibUnwindRegisterContext.h" |
| #include "ProcessGDBRemote.h" |
| #include "ProcessGDBRemoteLog.h" |
| #include "StringExtractorGDBRemote.h" |
| #include "UnwindLibUnwind.h" |
| #include "UnwindMacOSXFrameBackchain.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| //---------------------------------------------------------------------- |
| // Thread Registers |
| //---------------------------------------------------------------------- |
| |
| ThreadGDBRemote::ThreadGDBRemote (ProcessGDBRemote &process, lldb::tid_t tid) : |
| Thread(process, tid), |
| m_stop_info_stop_id (0), |
| m_stop_info (this), |
| m_thread_name (), |
| m_dispatch_queue_name (), |
| m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS), |
| m_unwinder_ap () |
| { |
| // ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD | GDBR_LOG_VERBOSE, "ThreadGDBRemote::ThreadGDBRemote ( pid = %i, tid = 0x%4.4x, )", m_process.GetID(), GetID()); |
| ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", this, m_process.GetID(), GetID()); |
| } |
| |
| ThreadGDBRemote::~ThreadGDBRemote () |
| { |
| ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", this, m_process.GetID(), GetID()); |
| } |
| |
| |
| const char * |
| ThreadGDBRemote::GetInfo () |
| { |
| return NULL; |
| } |
| |
| |
| const char * |
| ThreadGDBRemote::GetName () |
| { |
| if (m_thread_name.empty()) |
| return NULL; |
| return m_thread_name.c_str(); |
| } |
| |
| |
| const char * |
| ThreadGDBRemote::GetQueueName () |
| { |
| // Always re-fetch the dispatch queue name since it can change |
| if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS) |
| return GetGDBProcess().GetDispatchQueueNameForThread (m_thread_dispatch_qaddr, m_dispatch_queue_name); |
| return NULL; |
| } |
| |
| bool |
| ThreadGDBRemote::WillResume (StateType resume_state) |
| { |
| // TODO: cache for next time in case we can match things up?? |
| ClearStackFrames(); |
| int signo = GetResumeSignal(); |
| m_stop_info.Clear(); |
| switch (resume_state) |
| { |
| case eStateSuspended: |
| case eStateStopped: |
| // Don't append anything for threads that should stay stopped. |
| break; |
| |
| case eStateRunning: |
| if (m_process.GetUnixSignals().SignalIsValid (signo)) |
| GetGDBProcess().m_continue_packet.Printf(";C%2.2x:%4.4x", signo, GetID()); |
| else |
| GetGDBProcess().m_continue_packet.Printf(";c:%4.4x", GetID()); |
| break; |
| |
| case eStateStepping: |
| if (m_process.GetUnixSignals().SignalIsValid (signo)) |
| GetGDBProcess().m_continue_packet.Printf(";S%2.2x:%4.4x", signo, GetID()); |
| else |
| GetGDBProcess().m_continue_packet.Printf(";s:%4.4x", GetID()); |
| break; |
| } |
| Thread::WillResume(resume_state); |
| return true; |
| } |
| |
| void |
| ThreadGDBRemote::RefreshStateAfterStop() |
| { |
| // Invalidate all registers in our register context |
| GetRegisterContext()->Invalidate(); |
| } |
| |
| Unwind * |
| ThreadGDBRemote::GetUnwinder () |
| { |
| if (m_unwinder_ap.get() == NULL) |
| { |
| const ArchSpec target_arch (GetProcess().GetTarget().GetArchitecture ()); |
| if (target_arch == ArchSpec("x86_64") || target_arch == ArchSpec("i386")) |
| { |
| m_unwinder_ap.reset (new UnwindLibUnwind (*this, GetGDBProcess().GetLibUnwindAddressSpace())); |
| } |
| else |
| { |
| m_unwinder_ap.reset (new UnwindMacOSXFrameBackchain (*this)); |
| } |
| } |
| return m_unwinder_ap.get(); |
| } |
| |
| uint32_t |
| ThreadGDBRemote::GetStackFrameCount() |
| { |
| Unwind *unwinder = GetUnwinder (); |
| if (unwinder) |
| return unwinder->GetFrameCount(); |
| return 0; |
| } |
| |
| // Make sure that GetStackFrameAtIndex() does NOT call GetStackFrameCount() when |
| // getting the stack frame at index zero! This way GetStackFrameCount() (via |
| // GetStackFRameData()) can call this function to get the first frame in order |
| // to provide the first frame to a lower call for efficiency sake (avoid |
| // redundant lookups in the frame symbol context). |
| lldb::StackFrameSP |
| ThreadGDBRemote::GetStackFrameAtIndex (uint32_t idx) |
| { |
| |
| StackFrameSP frame_sp (m_frames.GetFrameAtIndex(idx)); |
| |
| if (frame_sp.get()) |
| return frame_sp; |
| |
| // Don't try and fetch a frame while process is running |
| // FIXME: This check isn't right because IsRunning checks the Public state, but this |
| // is work you need to do - for instance in ShouldStop & friends - before the public |
| // state has been changed. |
| // if (m_process.IsRunning()) |
| // return frame_sp; |
| |
| // Special case the first frame (idx == 0) so that we don't need to |
| // know how many stack frames there are to get it. If we need any other |
| // frames, then we do need to know if "idx" is a valid index. |
| if (idx == 0) |
| { |
| // If this is the first frame, we want to share the thread register |
| // context with the stack frame at index zero. |
| GetRegisterContext(); |
| assert (m_reg_context_sp.get()); |
| frame_sp.reset (new StackFrame (idx, *this, m_reg_context_sp, m_reg_context_sp->GetSP(), m_reg_context_sp->GetPC())); |
| } |
| else if (idx < GetStackFrameCount()) |
| { |
| Unwind *unwinder = GetUnwinder (); |
| if (unwinder) |
| { |
| addr_t pc, cfa; |
| if (unwinder->GetFrameInfoAtIndex(idx, cfa, pc)) |
| frame_sp.reset (new StackFrame (idx, *this, cfa, pc)); |
| } |
| } |
| m_frames.SetFrameAtIndex(idx, frame_sp); |
| return frame_sp; |
| } |
| |
| void |
| ThreadGDBRemote::ClearStackFrames () |
| { |
| Unwind *unwinder = GetUnwinder (); |
| if (unwinder) |
| unwinder->Clear(); |
| Thread::ClearStackFrames(); |
| } |
| |
| |
| bool |
| ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread) |
| { |
| return thread != 0; |
| } |
| |
| void |
| ThreadGDBRemote::Dump(Log *log, uint32_t index) |
| { |
| } |
| |
| |
| bool |
| ThreadGDBRemote::ShouldStop (bool &step_more) |
| { |
| return true; |
| } |
| RegisterContext * |
| ThreadGDBRemote::GetRegisterContext () |
| { |
| if (m_reg_context_sp.get() == NULL) |
| m_reg_context_sp.reset (CreateRegisterContextForFrame (NULL)); |
| return m_reg_context_sp.get(); |
| } |
| |
| RegisterContext * |
| ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame) |
| { |
| const bool read_all_registers_at_once = false; |
| uint32_t frame_idx = 0; |
| |
| if (frame) |
| frame_idx = frame->GetID(); |
| |
| if (frame_idx == 0) |
| return new GDBRemoteRegisterContext (*this, frame, GetGDBProcess().m_register_info, read_all_registers_at_once); |
| else if (m_unwinder_ap.get() && frame_idx < m_unwinder_ap->GetFrameCount()) |
| return m_unwinder_ap->CreateRegisterContextForFrame (frame); |
| return NULL; |
| } |
| |
| bool |
| ThreadGDBRemote::SaveFrameZeroState (RegisterCheckpoint &checkpoint) |
| { |
| lldb::StackFrameSP frame_sp(GetStackFrameAtIndex (0)); |
| if (frame_sp) |
| { |
| checkpoint.SetStackID(frame_sp->GetStackID()); |
| return frame_sp->GetRegisterContext()->ReadAllRegisterValues (checkpoint.GetData()); |
| } |
| return false; |
| } |
| |
| bool |
| ThreadGDBRemote::RestoreSaveFrameZero (const RegisterCheckpoint &checkpoint) |
| { |
| lldb::StackFrameSP frame_sp(GetStackFrameAtIndex (0)); |
| if (frame_sp) |
| { |
| bool ret = frame_sp->GetRegisterContext()->WriteAllRegisterValues (checkpoint.GetData()); |
| frame_sp->GetRegisterContext()->Invalidate(); |
| ClearStackFrames(); |
| return ret; |
| } |
| return false; |
| } |
| |
| bool |
| ThreadGDBRemote::GetRawStopReason (StopInfo *stop_info) |
| { |
| if (m_stop_info_stop_id != m_process.GetStopID()) |
| { |
| char packet[256]; |
| const int packet_len = snprintf(packet, sizeof(packet), "qThreadStopInfo%x", GetID()); |
| assert (packet_len < (sizeof(packet) - 1)); |
| StringExtractorGDBRemote stop_packet; |
| if (GetGDBProcess().GetGDBRemote().SendPacketAndWaitForResponse(packet, stop_packet, 1, false)) |
| { |
| std::string copy(stop_packet.GetStringRef()); |
| GetGDBProcess().SetThreadStopInfo (stop_packet); |
| // The process should have set the stop info stop ID and also |
| // filled this thread in with valid stop info |
| if (m_stop_info_stop_id != m_process.GetStopID()) |
| { |
| //ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "warning: qThreadStopInfo problem: '%s' => '%s'", packet, stop_packet.GetStringRef().c_str()); |
| printf("warning: qThreadStopInfo problem: '%s' => '%s'\n\torig '%s'\n", packet, stop_packet.GetStringRef().c_str(), copy.c_str()); /// REMOVE THIS |
| return false; |
| } |
| } |
| } |
| *stop_info = m_stop_info; |
| return true; |
| } |
| |
| |