1 //===-- CommandObjectExpression.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 "CommandObjectExpression.h" 11 12 // C Includes 13 // C++ Includes 14 // Other libraries and framework includes 15 // Project includes 16 #include "lldb/Interpreter/Args.h" 17 #include "lldb/Core/Value.h" 18 #include "lldb/Core/InputReader.h" 19 #include "lldb/Core/ValueObjectVariable.h" 20 #include "lldb/Expression/ClangExpressionVariable.h" 21 #include "lldb/Expression/ClangUserExpression.h" 22 #include "lldb/Expression/ClangFunction.h" 23 #include "lldb/Expression/DWARFExpression.h" 24 #include "lldb/Host/Host.h" 25 #include "lldb/Core/Debugger.h" 26 #include "lldb/Interpreter/CommandInterpreter.h" 27 #include "lldb/Interpreter/CommandReturnObject.h" 28 #include "lldb/Target/ObjCLanguageRuntime.h" 29 #include "lldb/Symbol/ObjectFile.h" 30 #include "lldb/Symbol/Variable.h" 31 #include "lldb/Target/Process.h" 32 #include "lldb/Target/StackFrame.h" 33 #include "lldb/Target/Target.h" 34 #include "lldb/Target/Thread.h" 35 #include "llvm/ADT/StringRef.h" 36 37 using namespace lldb; 38 using namespace lldb_private; 39 40 CommandObjectExpression::CommandOptions::CommandOptions (CommandInterpreter &interpreter) : 41 Options(interpreter) 42 { 43 // Keep only one place to reset the values to their defaults 44 OptionParsingStarting(); 45 } 46 47 48 CommandObjectExpression::CommandOptions::~CommandOptions () 49 { 50 } 51 52 Error 53 CommandObjectExpression::CommandOptions::SetOptionValue (uint32_t option_idx, const char *option_arg) 54 { 55 Error error; 56 57 char short_option = (char) m_getopt_table[option_idx].val; 58 59 switch (short_option) 60 { 61 //case 'l': 62 //if (language.SetLanguageFromCString (option_arg) == false) 63 //{ 64 // error.SetErrorStringWithFormat("Invalid language option argument '%s'.\n", option_arg); 65 //} 66 //break; 67 68 case 'g': 69 debug = true; 70 break; 71 72 case 'f': 73 error = Args::StringToFormat(option_arg, format, NULL); 74 break; 75 76 case 'o': 77 print_object = true; 78 break; 79 80 case 'd': 81 { 82 bool success; 83 bool result; 84 result = Args::StringToBoolean(option_arg, true, &success); 85 if (!success) 86 error.SetErrorStringWithFormat("Invalid dynamic value setting: \"%s\".\n", option_arg); 87 else 88 { 89 if (result) 90 use_dynamic = eLazyBoolYes; 91 else 92 use_dynamic = eLazyBoolNo; 93 } 94 } 95 break; 96 97 case 'u': 98 { 99 bool success; 100 unwind_on_error = Args::StringToBoolean(option_arg, true, &success); 101 if (!success) 102 error.SetErrorStringWithFormat("Could not convert \"%s\" to a boolean value.", option_arg); 103 break; 104 } 105 default: 106 error.SetErrorStringWithFormat("Invalid short option character '%c'.\n", short_option); 107 break; 108 } 109 110 return error; 111 } 112 113 void 114 CommandObjectExpression::CommandOptions::OptionParsingStarting () 115 { 116 //language.Clear(); 117 debug = false; 118 format = eFormatDefault; 119 print_object = false; 120 use_dynamic = eLazyBoolCalculate; 121 unwind_on_error = true; 122 show_types = true; 123 show_summary = true; 124 } 125 126 const OptionDefinition* 127 CommandObjectExpression::CommandOptions::GetDefinitions () 128 { 129 return g_option_table; 130 } 131 132 CommandObjectExpression::CommandObjectExpression (CommandInterpreter &interpreter) : 133 CommandObject (interpreter, 134 "expression", 135 "Evaluate a C/ObjC/C++ expression in the current program context, using variables currently in scope.", 136 NULL), 137 m_options (interpreter), 138 m_expr_line_count (0), 139 m_expr_lines () 140 { 141 SetHelpLong( 142 "Examples: \n\ 143 \n\ 144 expr my_struct->a = my_array[3] \n\ 145 expr -f bin -- (index * 8) + 5 \n\ 146 expr char c[] = \"foo\"; c[0]\n"); 147 148 CommandArgumentEntry arg; 149 CommandArgumentData expression_arg; 150 151 // Define the first (and only) variant of this arg. 152 expression_arg.arg_type = eArgTypeExpression; 153 expression_arg.arg_repetition = eArgRepeatPlain; 154 155 // There is only one variant this argument could be; put it into the argument entry. 156 arg.push_back (expression_arg); 157 158 // Push the data for the first argument into the m_arguments vector. 159 m_arguments.push_back (arg); 160 } 161 162 CommandObjectExpression::~CommandObjectExpression () 163 { 164 } 165 166 Options * 167 CommandObjectExpression::GetOptions () 168 { 169 return &m_options; 170 } 171 172 173 bool 174 CommandObjectExpression::Execute 175 ( 176 Args& command, 177 CommandReturnObject &result 178 ) 179 { 180 return false; 181 } 182 183 184 size_t 185 CommandObjectExpression::MultiLineExpressionCallback 186 ( 187 void *baton, 188 InputReader &reader, 189 lldb::InputReaderAction notification, 190 const char *bytes, 191 size_t bytes_len 192 ) 193 { 194 CommandObjectExpression *cmd_object_expr = (CommandObjectExpression *) baton; 195 bool batch_mode = reader.GetDebugger().GetCommandInterpreter().GetBatchCommandMode(); 196 197 switch (notification) 198 { 199 case eInputReaderActivate: 200 if (!batch_mode) 201 { 202 StreamSP async_strm_sp(reader.GetDebugger().GetAsyncOutputStream()); 203 if (async_strm_sp) 204 { 205 async_strm_sp->PutCString("Enter expressions, then terminate with an empty line to evaluate:\n"); 206 async_strm_sp->Flush(); 207 } 208 } 209 // Fall through 210 case eInputReaderReactivate: 211 break; 212 213 case eInputReaderDeactivate: 214 break; 215 216 case eInputReaderAsynchronousOutputWritten: 217 break; 218 219 case eInputReaderGotToken: 220 ++cmd_object_expr->m_expr_line_count; 221 if (bytes && bytes_len) 222 { 223 cmd_object_expr->m_expr_lines.append (bytes, bytes_len + 1); 224 } 225 226 if (bytes_len == 0) 227 reader.SetIsDone(true); 228 break; 229 230 case eInputReaderInterrupt: 231 cmd_object_expr->m_expr_lines.clear(); 232 reader.SetIsDone (true); 233 if (!batch_mode) 234 { 235 StreamSP async_strm_sp (reader.GetDebugger().GetAsyncOutputStream()); 236 if (async_strm_sp) 237 { 238 async_strm_sp->PutCString("Expression evaluation cancelled.\n"); 239 async_strm_sp->Flush(); 240 } 241 } 242 break; 243 244 case eInputReaderEndOfFile: 245 reader.SetIsDone (true); 246 break; 247 248 case eInputReaderDone: 249 if (cmd_object_expr->m_expr_lines.size() > 0) 250 { 251 StreamSP output_stream = reader.GetDebugger().GetAsyncOutputStream(); 252 StreamSP error_stream = reader.GetDebugger().GetAsyncErrorStream(); 253 cmd_object_expr->EvaluateExpression (cmd_object_expr->m_expr_lines.c_str(), 254 output_stream.get(), 255 error_stream.get()); 256 output_stream->Flush(); 257 error_stream->Flush(); 258 } 259 break; 260 } 261 262 return bytes_len; 263 } 264 265 bool 266 CommandObjectExpression::EvaluateExpression 267 ( 268 const char *expr, 269 Stream *output_stream, 270 Stream *error_stream, 271 CommandReturnObject *result 272 ) 273 { 274 if (m_exe_ctx.target) 275 { 276 lldb::ValueObjectSP result_valobj_sp; 277 278 ExecutionResults exe_results; 279 280 bool keep_in_memory = true; 281 lldb::DynamicValueType use_dynamic; 282 // If use dynamic is not set, get it from the target: 283 switch (m_options.use_dynamic) 284 { 285 case eLazyBoolCalculate: 286 use_dynamic = m_exe_ctx.target->GetPreferDynamicValue(); 287 break; 288 case eLazyBoolYes: 289 use_dynamic = lldb::eDynamicCanRunTarget; 290 break; 291 case eLazyBoolNo: 292 use_dynamic = lldb::eNoDynamicValues; 293 break; 294 } 295 296 exe_results = m_exe_ctx.target->EvaluateExpression(expr, 297 m_exe_ctx.frame, 298 eExecutionPolicyOnlyWhenNeeded, 299 m_options.unwind_on_error, 300 keep_in_memory, 301 use_dynamic, 302 result_valobj_sp); 303 304 if (exe_results == eExecutionInterrupted && !m_options.unwind_on_error) 305 { 306 uint32_t start_frame = 0; 307 uint32_t num_frames = 1; 308 uint32_t num_frames_with_source = 0; 309 if (m_exe_ctx.thread) 310 { 311 m_exe_ctx.thread->GetStatus (result->GetOutputStream(), 312 start_frame, 313 num_frames, 314 num_frames_with_source); 315 } 316 else if (m_exe_ctx.process) 317 { 318 bool only_threads_with_stop_reason = true; 319 m_exe_ctx.process->GetThreadStatus (result->GetOutputStream(), 320 only_threads_with_stop_reason, 321 start_frame, 322 num_frames, 323 num_frames_with_source); 324 } 325 } 326 327 if (result_valobj_sp) 328 { 329 if (result_valobj_sp->GetError().Success()) 330 { 331 if (m_options.format != eFormatDefault) 332 result_valobj_sp->SetFormat (m_options.format); 333 334 ValueObject::DumpValueObject (*(output_stream), 335 result_valobj_sp.get(), // Variable object to dump 336 result_valobj_sp->GetName().GetCString(),// Root object name 337 0, // Pointer depth to traverse (zero means stop at pointers) 338 0, // Current depth, this is the top most, so zero... 339 UINT32_MAX, // Max depth to go when dumping concrete types, dump everything... 340 m_options.show_types, // Show types when dumping? 341 false, // Show locations of variables, no since this is a host address which we don't care to see 342 m_options.print_object, // Print the objective C object? 343 use_dynamic, 344 true, // Use synthetic children if available 345 true, // Scope is already checked. Const results are always in scope. 346 false, // Don't flatten output 347 0, // Always use summaries (you might want an option --no-summary like there is for frame variable) 348 false); // Do not show more children than settings allow 349 if (result) 350 result->SetStatus (eReturnStatusSuccessFinishResult); 351 } 352 else 353 { 354 if (result_valobj_sp->GetError().GetError() == ClangUserExpression::kNoResult) 355 { 356 error_stream->PutCString("<no result>\n"); 357 358 if (result) 359 result->SetStatus (eReturnStatusSuccessFinishResult); 360 } 361 else 362 { 363 const char *error_cstr = result_valobj_sp->GetError().AsCString(); 364 if (error_cstr && error_cstr[0]) 365 { 366 int error_cstr_len = strlen (error_cstr); 367 const bool ends_with_newline = error_cstr[error_cstr_len - 1] == '\n'; 368 if (strstr(error_cstr, "error:") != error_cstr) 369 error_stream->PutCString ("error: "); 370 error_stream->Write(error_cstr, error_cstr_len); 371 if (!ends_with_newline) 372 error_stream->EOL(); 373 } 374 else 375 { 376 error_stream->PutCString ("error: unknown error\n"); 377 } 378 379 if (result) 380 result->SetStatus (eReturnStatusFailed); 381 } 382 } 383 } 384 } 385 else 386 { 387 error_stream->Printf ("error: invalid execution context for expression\n"); 388 return false; 389 } 390 391 return true; 392 } 393 394 bool 395 CommandObjectExpression::ExecuteRawCommandString 396 ( 397 const char *command, 398 CommandReturnObject &result 399 ) 400 { 401 m_exe_ctx = m_interpreter.GetExecutionContext(); 402 403 m_options.NotifyOptionParsingStarting(); 404 405 const char * expr = NULL; 406 407 if (command[0] == '\0') 408 { 409 m_expr_lines.clear(); 410 m_expr_line_count = 0; 411 412 InputReaderSP reader_sp (new InputReader(m_interpreter.GetDebugger())); 413 if (reader_sp) 414 { 415 Error err (reader_sp->Initialize (CommandObjectExpression::MultiLineExpressionCallback, 416 this, // baton 417 eInputReaderGranularityLine, // token size, to pass to callback function 418 NULL, // end token 419 NULL, // prompt 420 true)); // echo input 421 if (err.Success()) 422 { 423 m_interpreter.GetDebugger().PushInputReader (reader_sp); 424 result.SetStatus (eReturnStatusSuccessFinishNoResult); 425 } 426 else 427 { 428 result.AppendError (err.AsCString()); 429 result.SetStatus (eReturnStatusFailed); 430 } 431 } 432 else 433 { 434 result.AppendError("out of memory"); 435 result.SetStatus (eReturnStatusFailed); 436 } 437 return result.Succeeded(); 438 } 439 440 if (command[0] == '-') 441 { 442 // We have some options and these options MUST end with --. 443 const char *end_options = NULL; 444 const char *s = command; 445 while (s && s[0]) 446 { 447 end_options = ::strstr (s, "--"); 448 if (end_options) 449 { 450 end_options += 2; // Get past the "--" 451 if (::isspace (end_options[0])) 452 { 453 expr = end_options; 454 while (::isspace (*expr)) 455 ++expr; 456 break; 457 } 458 } 459 s = end_options; 460 } 461 462 if (end_options) 463 { 464 Args args (command, end_options - command); 465 if (!ParseOptions (args, result)) 466 return false; 467 468 Error error (m_options.NotifyOptionParsingFinished()); 469 if (error.Fail()) 470 { 471 result.AppendError (error.AsCString()); 472 result.SetStatus (eReturnStatusFailed); 473 return false; 474 } 475 } 476 } 477 478 if (expr == NULL) 479 expr = command; 480 481 if (EvaluateExpression (expr, &(result.GetOutputStream()), &(result.GetErrorStream()), &result)) 482 return true; 483 484 result.SetStatus (eReturnStatusFailed); 485 return false; 486 } 487 488 OptionDefinition 489 CommandObjectExpression::CommandOptions::g_option_table[] = 490 { 491 //{ LLDB_OPT_SET_ALL, false, "language", 'l', required_argument, NULL, 0, "[c|c++|objc|objc++]", "Sets the language to use when parsing the expression."}, 492 //{ LLDB_OPT_SET_1, false, "format", 'f', required_argument, NULL, 0, "[ [bool|b] | [bin] | [char|c] | [oct|o] | [dec|i|d|u] | [hex|x] | [float|f] | [cstr|s] ]", "Specify the format that the expression output should use."}, 493 { LLDB_OPT_SET_1, false, "format", 'f', required_argument, NULL, 0, eArgTypeExprFormat, "Specify the format that the expression output should use."}, 494 { LLDB_OPT_SET_2, false, "object-description", 'o', no_argument, NULL, 0, eArgTypeNone, "Print the object description of the value resulting from the expression."}, 495 { LLDB_OPT_SET_2, false, "dynamic-value", 'd', required_argument, NULL, 0, eArgTypeBoolean, "Upcast the value resulting from the expression to its dynamic type if available."}, 496 { LLDB_OPT_SET_ALL, false, "unwind-on-error", 'u', required_argument, NULL, 0, eArgTypeBoolean, "Clean up program state if the expression causes a crash, breakpoint hit or signal."}, 497 { LLDB_OPT_SET_ALL, false, "debug", 'g', no_argument, NULL, 0, eArgTypeNone, "Enable verbose debug logging of the expression parsing and evaluation."}, 498 { 0, false, NULL, 0, 0, NULL, 0, eArgTypeNone, NULL } 499 }; 500 501