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 (Process &process, lldb::tid_t tid) : 36 Thread(process, 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.GetID(), 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 // Call the Thread::WillResume first. If we stop at a signal, the stop info 87 // class for signal will set the resume signal that we need below. The signal 88 // stuff obeys the Process::UnixSignal defaults. 89 // If the thread's WillResume returns false, that means that we aren't going to actually resume, 90 // in which case we should not do the rest of our "resume" work. 91 92 if (!Thread::WillResume(resume_state)) 93 return false; 94 95 ClearStackFrames(); 96 97 int signo = GetResumeSignal(); 98 Log *log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD)); 99 if (log) 100 log->Printf ("Resuming thread: %4.4" PRIx64 " with state: %s.", GetID(), StateAsCString(resume_state)); 101 102 ProcessSP process_sp (GetProcess()); 103 if (process_sp) 104 { 105 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 106 switch (resume_state) 107 { 108 case eStateSuspended: 109 case eStateStopped: 110 // Don't append anything for threads that should stay stopped. 111 break; 112 113 case eStateRunning: 114 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 115 gdb_process->m_continue_C_tids.push_back(std::make_pair(GetID(), signo)); 116 else 117 gdb_process->m_continue_c_tids.push_back(GetID()); 118 break; 119 120 case eStateStepping: 121 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 122 gdb_process->m_continue_S_tids.push_back(std::make_pair(GetID(), signo)); 123 else 124 gdb_process->m_continue_s_tids.push_back(GetID()); 125 break; 126 127 default: 128 break; 129 } 130 return true; 131 } 132 return false; 133 } 134 135 void 136 ThreadGDBRemote::RefreshStateAfterStop() 137 { 138 // Invalidate all registers in our register context. We don't set "force" to 139 // true because the stop reply packet might have had some register values 140 // that were expedited and these will already be copied into the register 141 // context by the time this function gets called. The GDBRemoteRegisterContext 142 // class has been made smart enough to detect when it needs to invalidate 143 // which registers are valid by putting hooks in the register read and 144 // register supply functions where they check the process stop ID and do 145 // the right thing. 146 const bool force = false; 147 GetRegisterContext()->InvalidateIfNeeded (force); 148 } 149 150 void 151 ThreadGDBRemote::ClearStackFrames () 152 { 153 Unwind *unwinder = GetUnwinder (); 154 if (unwinder) 155 unwinder->Clear(); 156 Thread::ClearStackFrames(); 157 } 158 159 160 bool 161 ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread) 162 { 163 return thread != 0; 164 } 165 166 void 167 ThreadGDBRemote::Dump(Log *log, uint32_t index) 168 { 169 } 170 171 172 bool 173 ThreadGDBRemote::ShouldStop (bool &step_more) 174 { 175 return true; 176 } 177 lldb::RegisterContextSP 178 ThreadGDBRemote::GetRegisterContext () 179 { 180 if (m_reg_context_sp.get() == NULL) 181 m_reg_context_sp = CreateRegisterContextForFrame (NULL); 182 return m_reg_context_sp; 183 } 184 185 lldb::RegisterContextSP 186 ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame) 187 { 188 lldb::RegisterContextSP reg_ctx_sp; 189 const bool read_all_registers_at_once = false; 190 uint32_t concrete_frame_idx = 0; 191 192 if (frame) 193 concrete_frame_idx = frame->GetConcreteFrameIndex (); 194 195 196 if (concrete_frame_idx == 0) 197 { 198 ProcessSP process_sp (GetProcess()); 199 if (process_sp) 200 { 201 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 202 reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once)); 203 } 204 } 205 else 206 { 207 Unwind *unwinder = GetUnwinder (); 208 if (unwinder) 209 reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame); 210 } 211 return reg_ctx_sp; 212 } 213 214 bool 215 ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response) 216 { 217 GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get()); 218 assert (gdb_reg_ctx); 219 return gdb_reg_ctx->PrivateSetRegisterValue (reg, response); 220 } 221 222 lldb::StopInfoSP 223 ThreadGDBRemote::GetPrivateStopReason () 224 { 225 ProcessSP process_sp (GetProcess()); 226 if (process_sp) 227 { 228 const uint32_t process_stop_id = process_sp->GetStopID(); 229 if (m_thread_stop_reason_stop_id != process_stop_id || 230 (m_actual_stop_info_sp && !m_actual_stop_info_sp->IsValid())) 231 { 232 if (IsStillAtLastBreakpointHit()) 233 return m_actual_stop_info_sp; 234 235 // If GetGDBProcess().SetThreadStopInfo() doesn't find a stop reason 236 // for this thread, then m_actual_stop_info_sp will not ever contain 237 // a valid stop reason and the "m_actual_stop_info_sp->IsValid() == false" 238 // check will never be able to tell us if we have the correct stop info 239 // for this thread and we will continually send qThreadStopInfo packets 240 // down to the remote GDB server, so we need to keep our own notion 241 // of the stop ID that m_actual_stop_info_sp is valid for (even if it 242 // contains nothing). We use m_thread_stop_reason_stop_id for this below. 243 m_thread_stop_reason_stop_id = process_stop_id; 244 m_actual_stop_info_sp.reset(); 245 246 StringExtractorGDBRemote stop_packet; 247 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 248 if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetID(), stop_packet)) 249 gdb_process->SetThreadStopInfo (stop_packet); 250 } 251 } 252 return m_actual_stop_info_sp; 253 } 254 255 256