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/Breakpoint/Watchpoint.h" 14 #include "lldb/Core/ArchSpec.h" 15 #include "lldb/Core/DataExtractor.h" 16 #include "lldb/Core/State.h" 17 #include "lldb/Core/StreamString.h" 18 #include "lldb/Target/Platform.h" 19 #include "lldb/Target/Process.h" 20 #include "lldb/Target/RegisterContext.h" 21 #include "lldb/Target/StopInfo.h" 22 #include "lldb/Target/SystemRuntime.h" 23 #include "lldb/Target/Target.h" 24 #include "lldb/Target/UnixSignals.h" 25 #include "lldb/Target/Unwind.h" 26 27 #include "ProcessGDBRemote.h" 28 #include "ProcessGDBRemoteLog.h" 29 #include "Utility/StringExtractorGDBRemote.h" 30 31 using namespace lldb; 32 using namespace lldb_private; 33 using namespace lldb_private::process_gdb_remote; 34 35 //---------------------------------------------------------------------- 36 // Thread Registers 37 //---------------------------------------------------------------------- 38 39 ThreadGDBRemote::ThreadGDBRemote (Process &process, lldb::tid_t tid) : 40 Thread(process, tid), 41 m_thread_name (), 42 m_dispatch_queue_name (), 43 m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS) 44 { 45 ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", 46 this, 47 process.GetID(), 48 GetID()); 49 } 50 51 ThreadGDBRemote::~ThreadGDBRemote () 52 { 53 ProcessSP process_sp(GetProcess()); 54 ProcessGDBRemoteLog::LogIf(GDBR_LOG_THREAD, "%p: ThreadGDBRemote::~ThreadGDBRemote (pid = %i, tid = 0x%4.4x)", 55 this, 56 process_sp ? process_sp->GetID() : LLDB_INVALID_PROCESS_ID, 57 GetID()); 58 DestroyThread(); 59 } 60 61 const char * 62 ThreadGDBRemote::GetName () 63 { 64 if (m_thread_name.empty()) 65 return NULL; 66 return m_thread_name.c_str(); 67 } 68 69 70 const char * 71 ThreadGDBRemote::GetQueueName () 72 { 73 // Always re-fetch the dispatch queue name since it can change 74 75 if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS) 76 { 77 ProcessSP process_sp (GetProcess()); 78 if (process_sp) 79 { 80 SystemRuntime *runtime = process_sp->GetSystemRuntime (); 81 if (runtime) 82 { 83 m_dispatch_queue_name = runtime->GetQueueNameFromThreadQAddress (m_thread_dispatch_qaddr); 84 } 85 if (m_dispatch_queue_name.length() > 0) 86 { 87 return m_dispatch_queue_name.c_str(); 88 } 89 } 90 } 91 return NULL; 92 } 93 94 queue_id_t 95 ThreadGDBRemote::GetQueueID () 96 { 97 if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS) 98 { 99 ProcessSP process_sp (GetProcess()); 100 if (process_sp) 101 { 102 SystemRuntime *runtime = process_sp->GetSystemRuntime (); 103 if (runtime) 104 { 105 return runtime->GetQueueIDFromThreadQAddress (m_thread_dispatch_qaddr); 106 } 107 } 108 } 109 return LLDB_INVALID_QUEUE_ID; 110 } 111 112 QueueSP 113 ThreadGDBRemote::GetQueue () 114 { 115 queue_id_t queue_id = GetQueueID(); 116 QueueSP queue; 117 if (queue_id != LLDB_INVALID_QUEUE_ID) 118 { 119 ProcessSP process_sp (GetProcess()); 120 if (process_sp) 121 { 122 queue = process_sp->GetQueueList().FindQueueByID (queue_id); 123 } 124 } 125 return queue; 126 } 127 128 addr_t 129 ThreadGDBRemote::GetQueueLibdispatchQueueAddress () 130 { 131 addr_t dispatch_queue_t_addr = LLDB_INVALID_ADDRESS; 132 if (m_thread_dispatch_qaddr != 0 || m_thread_dispatch_qaddr != LLDB_INVALID_ADDRESS) 133 { 134 ProcessSP process_sp (GetProcess()); 135 if (process_sp) 136 { 137 SystemRuntime *runtime = process_sp->GetSystemRuntime (); 138 if (runtime) 139 { 140 dispatch_queue_t_addr = runtime->GetLibdispatchQueueAddressFromThreadQAddress (m_thread_dispatch_qaddr); 141 } 142 } 143 } 144 return dispatch_queue_t_addr; 145 } 146 147 StructuredData::ObjectSP 148 ThreadGDBRemote::FetchThreadExtendedInfo () 149 { 150 StructuredData::ObjectSP object_sp; 151 const lldb::user_id_t tid = GetProtocolID(); 152 Log *log(GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD)); 153 if (log) 154 log->Printf ("Fetching extended information for thread %4.4" PRIx64, tid); 155 ProcessSP process_sp (GetProcess()); 156 if (process_sp) 157 { 158 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 159 object_sp = gdb_process->GetExtendedInfoForThread (tid); 160 } 161 return object_sp; 162 } 163 164 void 165 ThreadGDBRemote::WillResume (StateType resume_state) 166 { 167 int signo = GetResumeSignal(); 168 const lldb::user_id_t tid = GetProtocolID(); 169 Log *log(GetLogIfAnyCategoriesSet (GDBR_LOG_THREAD)); 170 if (log) 171 log->Printf ("Resuming thread: %4.4" PRIx64 " with state: %s.", tid, StateAsCString(resume_state)); 172 173 ProcessSP process_sp (GetProcess()); 174 if (process_sp) 175 { 176 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 177 switch (resume_state) 178 { 179 case eStateSuspended: 180 case eStateStopped: 181 // Don't append anything for threads that should stay stopped. 182 break; 183 184 case eStateRunning: 185 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 186 gdb_process->m_continue_C_tids.push_back(std::make_pair(tid, signo)); 187 else 188 gdb_process->m_continue_c_tids.push_back(tid); 189 break; 190 191 case eStateStepping: 192 if (gdb_process->GetUnixSignals().SignalIsValid (signo)) 193 gdb_process->m_continue_S_tids.push_back(std::make_pair(tid, signo)); 194 else 195 gdb_process->m_continue_s_tids.push_back(tid); 196 break; 197 198 default: 199 break; 200 } 201 } 202 } 203 204 void 205 ThreadGDBRemote::RefreshStateAfterStop() 206 { 207 // Invalidate all registers in our register context. We don't set "force" to 208 // true because the stop reply packet might have had some register values 209 // that were expedited and these will already be copied into the register 210 // context by the time this function gets called. The GDBRemoteRegisterContext 211 // class has been made smart enough to detect when it needs to invalidate 212 // which registers are valid by putting hooks in the register read and 213 // register supply functions where they check the process stop ID and do 214 // the right thing. 215 const bool force = false; 216 GetRegisterContext()->InvalidateIfNeeded (force); 217 } 218 219 bool 220 ThreadGDBRemote::ThreadIDIsValid (lldb::tid_t thread) 221 { 222 return thread != 0; 223 } 224 225 void 226 ThreadGDBRemote::Dump(Log *log, uint32_t index) 227 { 228 } 229 230 231 bool 232 ThreadGDBRemote::ShouldStop (bool &step_more) 233 { 234 return true; 235 } 236 lldb::RegisterContextSP 237 ThreadGDBRemote::GetRegisterContext () 238 { 239 if (m_reg_context_sp.get() == NULL) 240 m_reg_context_sp = CreateRegisterContextForFrame (NULL); 241 return m_reg_context_sp; 242 } 243 244 lldb::RegisterContextSP 245 ThreadGDBRemote::CreateRegisterContextForFrame (StackFrame *frame) 246 { 247 lldb::RegisterContextSP reg_ctx_sp; 248 uint32_t concrete_frame_idx = 0; 249 250 if (frame) 251 concrete_frame_idx = frame->GetConcreteFrameIndex (); 252 253 254 if (concrete_frame_idx == 0) 255 { 256 ProcessSP process_sp (GetProcess()); 257 if (process_sp) 258 { 259 ProcessGDBRemote *gdb_process = static_cast<ProcessGDBRemote *>(process_sp.get()); 260 // read_all_registers_at_once will be true if 'p' packet is not supported. 261 bool read_all_registers_at_once = !gdb_process->GetGDBRemote().GetpPacketSupported (GetID()); 262 reg_ctx_sp.reset (new GDBRemoteRegisterContext (*this, concrete_frame_idx, gdb_process->m_register_info, read_all_registers_at_once)); 263 } 264 } 265 else 266 { 267 Unwind *unwinder = GetUnwinder (); 268 if (unwinder) 269 reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame); 270 } 271 return reg_ctx_sp; 272 } 273 274 bool 275 ThreadGDBRemote::PrivateSetRegisterValue (uint32_t reg, StringExtractor &response) 276 { 277 GDBRemoteRegisterContext *gdb_reg_ctx = static_cast<GDBRemoteRegisterContext *>(GetRegisterContext ().get()); 278 assert (gdb_reg_ctx); 279 return gdb_reg_ctx->PrivateSetRegisterValue (reg, response); 280 } 281 282 bool 283 ThreadGDBRemote::CalculateStopInfo () 284 { 285 ProcessSP process_sp (GetProcess()); 286 if (process_sp) 287 return static_cast<ProcessGDBRemote *>(process_sp.get())->CalculateThreadStopInfo(this); 288 return false; 289 } 290 291 292