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 void 84 ThreadGDBRemote::WillResume (StateType resume_state) 85 { 86 int signo = GetResumeSignal(); 87 const lldb::user_id_t tid = GetProtocolID(); 88 Log *log(lldb_private::GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD)); 89 if (log) 90 log->Printf ("Resuming thread: %4.4" PRIx64 " with state: %s.", tid, StateAsCString(resume_state)); 91 92 ProcessSP process_sp (GetProcess()); 93 if (process_sp) 94 { 95 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 96 switch (resume_state) 97 { 98 case eStateSuspended: 99 case eStateStopped: 100 // Don't append anything for threads that should stay stopped. 101 break; 102 103 case eStateRunning: 104 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 105 gdb_process->m_continue_C_tids.push_back(std::make_pair(tid, signo)); 106 else 107 gdb_process->m_continue_c_tids.push_back(tid); 108 break; 109 110 case eStateStepping: 111 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 112 gdb_process->m_continue_S_tids.push_back(std::make_pair(tid, signo)); 113 else 114 gdb_process->m_continue_s_tids.push_back(tid); 115 break; 116 117 default: 118 break; 119 } 120 } 121 } 122 123 void 124 ThreadGDBRemote::RefreshStateAfterStop() 125 { 126 // Invalidate all registers in our register context. We don't set "force" to 127 // true because the stop reply packet might have had some register values 128 // that were expedited and these will already be copied into the register 129 // context by the time this function gets called. The GDBRemoteRegisterContext 130 // class has been made smart enough to detect when it needs to invalidate 131 // which registers are valid by putting hooks in the register read and 132 // register supply functions where they check the process stop ID and do 133 // the right thing. 134 const bool force = false; 135 GetRegisterContext()->InvalidateIfNeeded (force); 136 } 137 138 bool 139 ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread) 140 { 141 return thread != 0; 142 } 143 144 void 145 ThreadGDBRemote::Dump(Log *log, uint32_t index) 146 { 147 } 148 149 150 bool 151 ThreadGDBRemote::ShouldStop (bool &step_more) 152 { 153 return true; 154 } 155 lldb::RegisterContextSP 156 ThreadGDBRemote::GetRegisterContext () 157 { 158 if (m_reg_context_sp.get() == NULL) 159 m_reg_context_sp = CreateRegisterContextForFrame (NULL); 160 return m_reg_context_sp; 161 } 162 163 lldb::RegisterContextSP 164 ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame) 165 { 166 lldb::RegisterContextSP reg_ctx_sp; 167 const bool read_all_registers_at_once = false; 168 uint32_t concrete_frame_idx = 0; 169 170 if (frame) 171 concrete_frame_idx = frame->GetConcreteFrameIndex (); 172 173 174 if (concrete_frame_idx == 0) 175 { 176 ProcessSP process_sp (GetProcess()); 177 if (process_sp) 178 { 179 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 180 reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once)); 181 } 182 } 183 else 184 { 185 Unwind *unwinder = GetUnwinder (); 186 if (unwinder) 187 reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame); 188 } 189 return reg_ctx_sp; 190 } 191 192 bool 193 ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response) 194 { 195 GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get()); 196 assert (gdb_reg_ctx); 197 return gdb_reg_ctx->PrivateSetRegisterValue (reg, response); 198 } 199 200 lldb::StopInfoSP 201 ThreadGDBRemote::GetPrivateStopReason () 202 { 203 ProcessSP process_sp (GetProcess()); 204 if (process_sp) 205 { 206 const uint32_t process_stop_id = process_sp->GetStopID(); 207 if (m_thread_stop_reason_stop_id == process_stop_id) 208 { 209 // Our stop info is up to date even if it is empty... 210 return m_actual_stop_info_sp; 211 } 212 213 if (m_actual_stop_info_sp && m_actual_stop_info_sp->IsValid()) 214 { 215 // The stop info is up to date, reset it so everything updates 216 SetStopInfo (m_actual_stop_info_sp); 217 } 218 else 219 { 220 if (IsStillAtLastBreakpointHit()) 221 { 222 SetStopInfo(m_actual_stop_info_sp); 223 } 224 else 225 { 226 // If GetGDBProcess().SetThreadStopInfo() doesn't find a stop reason 227 // for this thread, then m_actual_stop_info_sp will not ever contain 228 // a valid stop reason and the "m_actual_stop_info_sp->IsValid() == false" 229 // check will never be able to tell us if we have the correct stop info 230 // for this thread and we will continually send qThreadStopInfo packets 231 // down to the remote GDB server, so we need to keep our own notion 232 // of the stop ID that m_actual_stop_info_sp is valid for (even if it 233 // contains nothing). We use m_thread_stop_reason_stop_id for this below. 234 m_actual_stop_info_sp.reset(); 235 236 StringExtractorGDBRemote stop_packet; 237 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 238 if (gdb_process->GetGDBRemote().GetThreadStopInfo(GetProtocolID(), stop_packet)) 239 { 240 gdb_process->SetThreadStopInfo (stop_packet); 241 } 242 else 243 { 244 SetStopInfo (StopInfoSP()); 245 } 246 } 247 } 248 } 249 return m_actual_stop_info_sp; 250 } 251 252 253