1 //===-- ThreadGDBRemote.cpp -------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 11 #include "ThreadGDBRemote.h" 12 13 #include "lldb/Core/ArchSpec.h" 14 #include "lldb/Core/DataExtractor.h" 15 #include "lldb/Core/StreamString.h" 16 #include "lldb/Core/State.h" 17 #include "lldb/Target/Process.h" 18 #include "lldb/Target/RegisterContext.h" 19 #include "lldb/Target/StopInfo.h" 20 #include "lldb/Target/Target.h" 21 #include "lldb/Target/Unwind.h" 22 #include "lldb/Breakpoint/Watchpoint.h" 23 24 #include "ProcessGDBRemote.h" 25 #include "ProcessGDBRemoteLog.h" 26 #include "Utility/StringExtractorGDBRemote.h" 27 28 using namespace lldb; 29 using namespace lldb_private; 30 31 //---------------------------------------------------------------------- 32 // Thread Registers 33 //---------------------------------------------------------------------- 34 35 ThreadGDBRemote::ThreadGDBRemote (const ProcessSP &process_sp, lldb::tid_t tid) : 36 Thread(process_sp, tid), 37 m_thread_name (), 38 m_dispatch_queue_name (), 39 m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS) 40 { 41 ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", 42 this, 43 process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID, 44 GetID()); 45 } 46 47 ThreadGDBRemote::~ThreadGDBRemote () 48 { 49 ProcessSP process_sp(GetProcess()); 50 ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", 51 this, 52 process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID, 53 GetID()); 54 DestroyThread(); 55 } 56 57 const char * 58 ThreadGDBRemote::GetName () 59 { 60 if (m_thread_name.empty()) 61 return NULL; 62 return m_thread_name.c_str(); 63 } 64 65 66 const char * 67 ThreadGDBRemote::GetQueueName () 68 { 69 // Always re-fetch the dispatch queue name since it can change 70 71 if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS) 72 { 73 ProcessSP process_sp (GetProcess()); 74 if (process_sp) 75 { 76 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 77 return gdb_process->GetDispatchQueueNameForThread (m_thread_dispatch_qaddr, m_dispatch_queue_name); 78 } 79 } 80 return NULL; 81 } 82 83 bool 84 ThreadGDBRemote::WillResume (StateType resume_state) 85 { 86 ClearStackFrames(); 87 // Call the Thread::WillResume first. If we stop at a signal, the stop info 88 // class for signal will set the resume signal that we need below. The signal 89 // stuff obeys the Process::UnixSignal defaults. 90 Thread::WillResume(resume_state); 91 92 int signo = GetResumeSignal(); 93 lldb::LogSP log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD)); 94 if (log) 95 log->Printf ("Resuming thread: %4.4llx with state: %s.", GetID(), StateAsCString(resume_state)); 96 97 ProcessSP process_sp (GetProcess()); 98 if (process_sp) 99 { 100 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 101 switch (resume_state) 102 { 103 case eStateSuspended: 104 case eStateStopped: 105 // Don't append anything for threads that should stay stopped. 106 break; 107 108 case eStateRunning: 109 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 110 gdb_process->m_continue_C_tids.push_back(std::make_pair(GetID(), signo)); 111 else 112 gdb_process->m_continue_c_tids.push_back(GetID()); 113 break; 114 115 case eStateStepping: 116 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 117 gdb_process->m_continue_S_tids.push_back(std::make_pair(GetID(), signo)); 118 else 119 gdb_process->m_continue_s_tids.push_back(GetID()); 120 break; 121 122 default: 123 break; 124 } 125 return true; 126 } 127 return false; 128 } 129 130 void 131 ThreadGDBRemote::RefreshStateAfterStop() 132 { 133 // Invalidate all registers in our register context. We don't set "force" to 134 // true because the stop reply packet might have had some register values 135 // that were expedited and these will already be copied into the register 136 // context by the time this function gets called. The GDBRemoteRegisterContext 137 // class has been made smart enough to detect when it needs to invalidate 138 // which registers are valid by putting hooks in the register read and 139 // register supply functions where they check the process stop ID and do 140 // the right thing. 141 const bool force = false; 142 GetRegisterContext()->InvalidateIfNeeded (force); 143 } 144 145 void 146 ThreadGDBRemote::ClearStackFrames () 147 { 148 Unwind *unwinder = GetUnwinder (); 149 if (unwinder) 150 unwinder->Clear(); 151 Thread::ClearStackFrames(); 152 } 153 154 155 bool 156 ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread) 157 { 158 return thread != 0; 159 } 160 161 void 162 ThreadGDBRemote::Dump(Log *log, uint32_t index) 163 { 164 } 165 166 167 bool 168 ThreadGDBRemote::ShouldStop (bool &step_more) 169 { 170 return true; 171 } 172 lldb::RegisterContextSP 173 ThreadGDBRemote::GetRegisterContext () 174 { 175 if (m_reg_context_sp.get() == NULL) 176 m_reg_context_sp = CreateRegisterContextForFrame (NULL); 177 return m_reg_context_sp; 178 } 179 180 lldb::RegisterContextSP 181 ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame) 182 { 183 lldb::RegisterContextSP reg_ctx_sp; 184 const bool read_all_registers_at_once = false; 185 uint32_t concrete_frame_idx = 0; 186 187 if (frame) 188 concrete_frame_idx = frame->GetConcreteFrameIndex (); 189 190 191 if (concrete_frame_idx == 0) 192 { 193 ProcessSP process_sp (GetProcess()); 194 if (process_sp) 195 { 196 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 197 reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once)); 198 } 199 } 200 else if (m_unwinder_ap.get()) 201 reg_ctx_sp = m_unwinder_ap->CreateRegisterContextForFrame (frame); 202 return reg_ctx_sp; 203 } 204 205 bool 206 ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response) 207 { 208 GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get()); 209 assert (gdb_reg_ctx); 210 return gdb_reg_ctx->PrivateSetRegisterValue (reg, response); 211 } 212 213 lldb::StopInfoSP 214 ThreadGDBRemote::GetPrivateStopReason () 215 { 216 ProcessSP process_sp (GetProcess()); 217 if (process_sp) 218 { 219 const uint32_t process_stop_id = process_sp->GetStopID(); 220 if (m_thread_stop_reason_stop_id != process_stop_id || 221 (m_actual_stop_info_sp && !m_actual_stop_info_sp->IsValid())) 222 { 223 // If GetGDBProcess().SetThreadStopInfo() doesn't find a stop reason 224 // for this thread, then m_actual_stop_info_sp will not ever contain 225 // a valid stop reason and the "m_actual_stop_info_sp->IsValid() == false" 226 // check will never be able to tell us if we have the correct stop info 227 // for this thread and we will continually send qThreadStopInfo packets 228 // down to the remote GDB server, so we need to keep our own notion 229 // of the stop ID that m_actual_stop_info_sp is valid for (even if it 230 // contains nothing). We use m_thread_stop_reason_stop_id for this below. 231 m_thread_stop_reason_stop_id = process_stop_id; 232 m_actual_stop_info_sp.reset(); 233 234 StringExtractorGDBRemote stop_packet; 235 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 236 if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetID(), stop_packet)) 237 gdb_process->SetThreadStopInfo (stop_packet); 238 } 239 } 240 return m_actual_stop_info_sp; 241 } 242 243 244