1 //===-- OperatingSystemPython.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 #include "lldb/lldb-python.h" 11 12 #ifndef LLDB_DISABLE_PYTHON 13 14 #include "OperatingSystemPython.h" 15 // C Includes 16 // C++ Includes 17 // Other libraries and framework includes 18 #include "lldb/Core/ArchSpec.h" 19 #include "lldb/Core/DataBufferHeap.h" 20 #include "lldb/Core/Debugger.h" 21 #include "lldb/Core/Module.h" 22 #include "lldb/Core/PluginManager.h" 23 #include "lldb/Core/RegisterValue.h" 24 #include "lldb/Core/StreamString.h" 25 #include "lldb/Core/StructuredData.h" 26 #include "lldb/Core/ValueObjectVariable.h" 27 #include "lldb/Interpreter/CommandInterpreter.h" 28 #include "lldb/Interpreter/ScriptInterpreter.h" 29 #include "lldb/Symbol/ClangNamespaceDecl.h" 30 #include "lldb/Symbol/ObjectFile.h" 31 #include "lldb/Symbol/VariableList.h" 32 #include "lldb/Target/Process.h" 33 #include "lldb/Target/StopInfo.h" 34 #include "lldb/Target/Target.h" 35 #include "lldb/Target/ThreadList.h" 36 #include "lldb/Target/Thread.h" 37 #include "Plugins/Process/Utility/DynamicRegisterInfo.h" 38 #include "Plugins/Process/Utility/RegisterContextDummy.h" 39 #include "Plugins/Process/Utility/RegisterContextMemory.h" 40 #include "Plugins/Process/Utility/ThreadMemory.h" 41 42 using namespace lldb; 43 using namespace lldb_private; 44 45 void 46 OperatingSystemPython::Initialize() 47 { 48 PluginManager::RegisterPlugin (GetPluginNameStatic(), 49 GetPluginDescriptionStatic(), 50 CreateInstance); 51 } 52 53 void 54 OperatingSystemPython::Terminate() 55 { 56 PluginManager::UnregisterPlugin (CreateInstance); 57 } 58 59 OperatingSystem * 60 OperatingSystemPython::CreateInstance (Process *process, bool force) 61 { 62 // Python OperatingSystem plug-ins must be requested by name, so force must be true 63 FileSpec python_os_plugin_spec (process->GetPythonOSPluginPath()); 64 if (python_os_plugin_spec && python_os_plugin_spec.Exists()) 65 { 66 std::unique_ptr<OperatingSystemPython> os_ap (new OperatingSystemPython (process, python_os_plugin_spec)); 67 if (os_ap.get() && os_ap->IsValid()) 68 return os_ap.release(); 69 } 70 return NULL; 71 } 72 73 74 ConstString 75 OperatingSystemPython::GetPluginNameStatic() 76 { 77 static ConstString g_name("python"); 78 return g_name; 79 } 80 81 const char * 82 OperatingSystemPython::GetPluginDescriptionStatic() 83 { 84 return "Operating system plug-in that gathers OS information from a python class that implements the necessary OperatingSystem functionality."; 85 } 86 87 88 OperatingSystemPython::OperatingSystemPython (lldb_private::Process *process, const FileSpec &python_module_path) : 89 OperatingSystem (process), 90 m_thread_list_valobj_sp (), 91 m_register_info_ap (), 92 m_interpreter (NULL), 93 m_python_object_sp () 94 { 95 if (!process) 96 return; 97 TargetSP target_sp = process->CalculateTarget(); 98 if (!target_sp) 99 return; 100 m_interpreter = target_sp->GetDebugger().GetCommandInterpreter().GetScriptInterpreter(); 101 if (m_interpreter) 102 { 103 104 std::string os_plugin_class_name (python_module_path.GetFilename().AsCString("")); 105 if (!os_plugin_class_name.empty()) 106 { 107 const bool init_session = false; 108 const bool allow_reload = true; 109 char python_module_path_cstr[PATH_MAX]; 110 python_module_path.GetPath(python_module_path_cstr, sizeof(python_module_path_cstr)); 111 Error error; 112 if (m_interpreter->LoadScriptingModule (python_module_path_cstr, allow_reload, init_session, error)) 113 { 114 // Strip the ".py" extension if there is one 115 size_t py_extension_pos = os_plugin_class_name.rfind(".py"); 116 if (py_extension_pos != std::string::npos) 117 os_plugin_class_name.erase (py_extension_pos); 118 // Add ".OperatingSystemPlugIn" to the module name to get a string like "modulename.OperatingSystemPlugIn" 119 os_plugin_class_name += ".OperatingSystemPlugIn"; 120 StructuredData::ObjectSP object_sp = 121 m_interpreter->OSPlugin_CreatePluginObject(os_plugin_class_name.c_str(), process->CalculateProcess()); 122 if (object_sp && object_sp->IsValid()) 123 m_python_object_sp = object_sp; 124 } 125 } 126 } 127 } 128 129 OperatingSystemPython::~OperatingSystemPython () 130 { 131 } 132 133 DynamicRegisterInfo * 134 OperatingSystemPython::GetDynamicRegisterInfo () 135 { 136 if (m_register_info_ap.get() == NULL) 137 { 138 if (!m_interpreter || !m_python_object_sp) 139 return NULL; 140 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OS)); 141 142 if (log) 143 log->Printf ("OperatingSystemPython::GetDynamicRegisterInfo() fetching thread register definitions from python for pid %" PRIu64, m_process->GetID()); 144 145 StructuredData::DictionarySP dictionary = m_interpreter->OSPlugin_RegisterInfo(m_python_object_sp); 146 if (!dictionary) 147 return NULL; 148 149 m_register_info_ap.reset(new DynamicRegisterInfo(*dictionary, m_process->GetTarget().GetArchitecture())); 150 assert (m_register_info_ap->GetNumRegisters() > 0); 151 assert (m_register_info_ap->GetNumRegisterSets() > 0); 152 } 153 return m_register_info_ap.get(); 154 } 155 156 //------------------------------------------------------------------ 157 // PluginInterface protocol 158 //------------------------------------------------------------------ 159 ConstString 160 OperatingSystemPython::GetPluginName() 161 { 162 return GetPluginNameStatic(); 163 } 164 165 uint32_t 166 OperatingSystemPython::GetPluginVersion() 167 { 168 return 1; 169 } 170 171 bool 172 OperatingSystemPython::UpdateThreadList (ThreadList &old_thread_list, 173 ThreadList &core_thread_list, 174 ThreadList &new_thread_list) 175 { 176 if (!m_interpreter || !m_python_object_sp) 177 return false; 178 179 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_OS)); 180 181 // First thing we have to do is to try to get the API lock, and the run lock. 182 // We're going to change the thread content of the process, and we're going 183 // to use python, which requires the API lock to do it. 184 // 185 // If someone already has the API lock, that is ok, we just want to avoid 186 // external code from making new API calls while this call is happening. 187 // 188 // This is a recursive lock so we can grant it to any Python code called on 189 // the stack below us. 190 Target &target = m_process->GetTarget(); 191 Mutex::Locker api_locker; 192 api_locker.TryLock(target.GetAPIMutex()); 193 194 if (log) 195 log->Printf ("OperatingSystemPython::UpdateThreadList() fetching thread data from python for pid %" PRIu64, m_process->GetID()); 196 197 // The threads that are in "new_thread_list" upon entry are the threads from the 198 // lldb_private::Process subclass, no memory threads will be in this list. 199 200 auto lock = m_interpreter->AcquireInterpreterLock(); // to make sure threads_list stays alive 201 StructuredData::ArraySP threads_list = m_interpreter->OSPlugin_ThreadsInfo(m_python_object_sp); 202 203 const uint32_t num_cores = core_thread_list.GetSize(false); 204 205 // Make a map so we can keep track of which cores were used from the 206 // core_thread list. Any real threads/cores that weren't used should 207 // later be put back into the "new_thread_list". 208 std::vector<bool> core_used_map(num_cores, false); 209 if (threads_list) 210 { 211 if (log) 212 { 213 StreamString strm; 214 threads_list->Dump(strm); 215 log->Printf("threads_list = %s", strm.GetString().c_str()); 216 } 217 218 const uint32_t num_threads = threads_list->GetSize(); 219 for (uint32_t i = 0; i < num_threads; ++i) 220 { 221 StructuredData::ObjectSP thread_dict_obj = threads_list->GetItemAtIndex(i); 222 if (auto thread_dict = thread_dict_obj->GetAsDictionary()) 223 { 224 ThreadSP thread_sp(CreateThreadFromThreadInfo(*thread_dict, core_thread_list, old_thread_list, core_used_map, NULL)); 225 if (thread_sp) 226 new_thread_list.AddThread(thread_sp); 227 } 228 } 229 } 230 231 // Any real core threads that didn't end up backing a memory thread should 232 // still be in the main thread list, and they should be inserted at the beginning 233 // of the list 234 uint32_t insert_idx = 0; 235 for (uint32_t core_idx = 0; core_idx < num_cores; ++core_idx) 236 { 237 if (core_used_map[core_idx] == false) 238 { 239 new_thread_list.InsertThread (core_thread_list.GetThreadAtIndex(core_idx, false), insert_idx); 240 ++insert_idx; 241 } 242 } 243 244 return new_thread_list.GetSize(false) > 0; 245 } 246 247 ThreadSP 248 OperatingSystemPython::CreateThreadFromThreadInfo(StructuredData::Dictionary &thread_dict, ThreadList &core_thread_list, 249 ThreadList &old_thread_list, std::vector<bool> &core_used_map, bool *did_create_ptr) 250 { 251 ThreadSP thread_sp; 252 tid_t tid = LLDB_INVALID_THREAD_ID; 253 if (!thread_dict.GetValueForKeyAsInteger("tid", tid)) 254 return ThreadSP(); 255 256 uint32_t core_number; 257 addr_t reg_data_addr; 258 std::string name; 259 std::string queue; 260 261 thread_dict.GetValueForKeyAsInteger("core", core_number, UINT32_MAX); 262 thread_dict.GetValueForKeyAsInteger("register_data_addr", reg_data_addr, LLDB_INVALID_ADDRESS); 263 thread_dict.GetValueForKeyAsString("name", name); 264 thread_dict.GetValueForKeyAsString("queue", queue); 265 266 // See if a thread already exists for "tid" 267 thread_sp = old_thread_list.FindThreadByID(tid, false); 268 if (thread_sp) 269 { 270 // A thread already does exist for "tid", make sure it was an operating system 271 // plug-in generated thread. 272 if (!IsOperatingSystemPluginThread(thread_sp)) 273 { 274 // We have thread ID overlap between the protocol threads and the 275 // operating system threads, clear the thread so we create an 276 // operating system thread for this. 277 thread_sp.reset(); 278 } 279 } 280 281 if (!thread_sp) 282 { 283 if (did_create_ptr) 284 *did_create_ptr = true; 285 thread_sp.reset(new ThreadMemory(*m_process, tid, name.c_str(), queue.c_str(), reg_data_addr)); 286 } 287 288 if (core_number < core_thread_list.GetSize(false)) 289 { 290 ThreadSP core_thread_sp(core_thread_list.GetThreadAtIndex(core_number, false)); 291 if (core_thread_sp) 292 { 293 // Keep track of which cores were set as the backing thread for memory threads... 294 if (core_number < core_used_map.size()) 295 core_used_map[core_number] = true; 296 297 ThreadSP backing_core_thread_sp(core_thread_sp->GetBackingThread()); 298 if (backing_core_thread_sp) 299 { 300 thread_sp->SetBackingThread(backing_core_thread_sp); 301 } 302 else 303 { 304 thread_sp->SetBackingThread(core_thread_sp); 305 } 306 } 307 } 308 return thread_sp; 309 } 310 311 312 313 void 314 OperatingSystemPython::ThreadWasSelected (Thread *thread) 315 { 316 } 317 318 RegisterContextSP 319 OperatingSystemPython::CreateRegisterContextForThread (Thread *thread, addr_t reg_data_addr) 320 { 321 RegisterContextSP reg_ctx_sp; 322 if (!m_interpreter || !m_python_object_sp || !thread) 323 return reg_ctx_sp; 324 325 if (!IsOperatingSystemPluginThread(thread->shared_from_this())) 326 return reg_ctx_sp; 327 328 // First thing we have to do is get the API lock, and the run lock. We're going to change the thread 329 // content of the process, and we're going to use python, which requires the API lock to do it. 330 // So get & hold that. This is a recursive lock so we can grant it to any Python code called on the stack below us. 331 Target &target = m_process->GetTarget(); 332 Mutex::Locker api_locker (target.GetAPIMutex()); 333 334 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_THREAD)); 335 336 auto lock = m_interpreter->AcquireInterpreterLock(); // to make sure python objects stays alive 337 if (reg_data_addr != LLDB_INVALID_ADDRESS) 338 { 339 // The registers data is in contiguous memory, just create the register 340 // context using the address provided 341 if (log) 342 log->Printf ("OperatingSystemPython::CreateRegisterContextForThread (tid = 0x%" PRIx64 ", 0x%" PRIx64 ", reg_data_addr = 0x%" PRIx64 ") creating memory register context", 343 thread->GetID(), 344 thread->GetProtocolID(), 345 reg_data_addr); 346 reg_ctx_sp.reset (new RegisterContextMemory (*thread, 0, *GetDynamicRegisterInfo (), reg_data_addr)); 347 } 348 else 349 { 350 // No register data address is provided, query the python plug-in to let 351 // it make up the data as it sees fit 352 if (log) 353 log->Printf ("OperatingSystemPython::CreateRegisterContextForThread (tid = 0x%" PRIx64 ", 0x%" PRIx64 ") fetching register data from python", 354 thread->GetID(), 355 thread->GetProtocolID()); 356 357 StructuredData::StringSP reg_context_data = m_interpreter->OSPlugin_RegisterContextData(m_python_object_sp, thread->GetID()); 358 if (reg_context_data) 359 { 360 std::string value = reg_context_data->GetValue(); 361 DataBufferSP data_sp(new DataBufferHeap(value.c_str(), value.length())); 362 if (data_sp->GetByteSize()) 363 { 364 RegisterContextMemory *reg_ctx_memory = new RegisterContextMemory (*thread, 0, *GetDynamicRegisterInfo (), LLDB_INVALID_ADDRESS); 365 if (reg_ctx_memory) 366 { 367 reg_ctx_sp.reset(reg_ctx_memory); 368 reg_ctx_memory->SetAllRegisterData (data_sp); 369 } 370 } 371 } 372 } 373 // if we still have no register data, fallback on a dummy context to avoid crashing 374 if (!reg_ctx_sp) 375 { 376 if (log) 377 log->Printf ("OperatingSystemPython::CreateRegisterContextForThread (tid = 0x%" PRIx64 ") forcing a dummy register context", thread->GetID()); 378 reg_ctx_sp.reset(new RegisterContextDummy(*thread,0,target.GetArchitecture().GetAddressByteSize())); 379 } 380 return reg_ctx_sp; 381 } 382 383 StopInfoSP 384 OperatingSystemPython::CreateThreadStopReason (lldb_private::Thread *thread) 385 { 386 // We should have gotten the thread stop info from the dictionary of data for 387 // the thread in the initial call to get_thread_info(), this should have been 388 // cached so we can return it here 389 StopInfoSP stop_info_sp; //(StopInfo::CreateStopReasonWithSignal (*thread, SIGSTOP)); 390 return stop_info_sp; 391 } 392 393 lldb::ThreadSP 394 OperatingSystemPython::CreateThread (lldb::tid_t tid, addr_t context) 395 { 396 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_THREAD)); 397 398 if (log) 399 log->Printf ("OperatingSystemPython::CreateThread (tid = 0x%" PRIx64 ", context = 0x%" PRIx64 ") fetching register data from python", tid, context); 400 401 if (m_interpreter && m_python_object_sp) 402 { 403 // First thing we have to do is get the API lock, and the run lock. We're going to change the thread 404 // content of the process, and we're going to use python, which requires the API lock to do it. 405 // So get & hold that. This is a recursive lock so we can grant it to any Python code called on the stack below us. 406 Target &target = m_process->GetTarget(); 407 Mutex::Locker api_locker (target.GetAPIMutex()); 408 409 auto lock = m_interpreter->AcquireInterpreterLock(); // to make sure thread_info_dict stays alive 410 StructuredData::DictionarySP thread_info_dict = m_interpreter->OSPlugin_CreateThread(m_python_object_sp, tid, context); 411 std::vector<bool> core_used_map; 412 if (thread_info_dict) 413 { 414 ThreadList core_threads(m_process); 415 ThreadList &thread_list = m_process->GetThreadList(); 416 bool did_create = false; 417 ThreadSP thread_sp(CreateThreadFromThreadInfo(*thread_info_dict, core_threads, thread_list, core_used_map, &did_create)); 418 if (did_create) 419 thread_list.AddThread(thread_sp); 420 return thread_sp; 421 } 422 } 423 return ThreadSP(); 424 } 425 426 427 428 #endif // #ifndef LLDB_DISABLE_PYTHON 429