1 //===-- CommandObjectDisassemble.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 "CommandObjectDisassemble.h" 11 12 // C Includes 13 // C++ Includes 14 // Other libraries and framework includes 15 // Project includes 16 #include "lldb/Core/AddressRange.h" 17 #include "lldb/Interpreter/Args.h" 18 #include "lldb/Interpreter/CommandCompletions.h" 19 #include "lldb/Interpreter/CommandInterpreter.h" 20 #include "lldb/Interpreter/CommandReturnObject.h" 21 #include "lldb/Core/Disassembler.h" 22 #include "lldb/Interpreter/Options.h" 23 #include "lldb/Core/SourceManager.h" 24 #include "lldb/Target/StackFrame.h" 25 #include "lldb/Symbol/Symbol.h" 26 #include "lldb/Target/Process.h" 27 #include "lldb/Target/Target.h" 28 29 #define DEFAULT_DISASM_BYTE_SIZE 32 30 #define DEFAULT_DISASM_NUM_INS 4 31 32 using namespace lldb; 33 using namespace lldb_private; 34 35 CommandObjectDisassemble::CommandOptions::CommandOptions (CommandInterpreter &interpreter) : 36 Options(interpreter), 37 num_lines_context(0), 38 num_instructions (0), 39 func_name(), 40 cur_function (false), 41 start_addr(), 42 end_addr (), 43 at_pc (false), 44 frame_line (false), 45 plugin_name (), 46 arch(), 47 some_location_specified (false) 48 { 49 OptionParsingStarting(); 50 } 51 52 CommandObjectDisassemble::CommandOptions::~CommandOptions () 53 { 54 } 55 56 Error 57 CommandObjectDisassemble::CommandOptions::SetOptionValue (uint32_t option_idx, const char *option_arg) 58 { 59 Error error; 60 61 char short_option = (char) m_getopt_table[option_idx].val; 62 63 bool success; 64 65 switch (short_option) 66 { 67 case 'm': 68 show_mixed = true; 69 break; 70 71 case 'C': 72 num_lines_context = Args::StringToUInt32(option_arg, 0, 0, &success); 73 if (!success) 74 error.SetErrorStringWithFormat ("invalid num context lines string: \"%s\"", option_arg); 75 break; 76 77 case 'c': 78 num_instructions = Args::StringToUInt32(option_arg, 0, 0, &success); 79 if (!success) 80 error.SetErrorStringWithFormat ("invalid num of instructions string: \"%s\"", option_arg); 81 break; 82 83 case 'b': 84 show_bytes = true; 85 break; 86 87 case 's': 88 start_addr = Args::StringToUInt64(option_arg, LLDB_INVALID_ADDRESS, 0); 89 if (start_addr == LLDB_INVALID_ADDRESS) 90 start_addr = Args::StringToUInt64(option_arg, LLDB_INVALID_ADDRESS, 16); 91 92 if (start_addr == LLDB_INVALID_ADDRESS) 93 error.SetErrorStringWithFormat ("invalid start address string '%s'", option_arg); 94 some_location_specified = true; 95 break; 96 case 'e': 97 end_addr = Args::StringToUInt64(option_arg, LLDB_INVALID_ADDRESS, 0); 98 if (end_addr == LLDB_INVALID_ADDRESS) 99 end_addr = Args::StringToUInt64(option_arg, LLDB_INVALID_ADDRESS, 16); 100 101 if (end_addr == LLDB_INVALID_ADDRESS) 102 error.SetErrorStringWithFormat ("invalid end address string '%s'", option_arg); 103 break; 104 some_location_specified = true; 105 case 'n': 106 func_name.assign (option_arg); 107 some_location_specified = true; 108 break; 109 110 case 'p': 111 at_pc = true; 112 some_location_specified = true; 113 break; 114 115 case 'l': 116 frame_line = true; 117 // Disassemble the current source line kind of implies showing mixed 118 // source code context. 119 show_mixed = true; 120 some_location_specified = true; 121 break; 122 123 case 'P': 124 plugin_name.assign (option_arg); 125 break; 126 127 case 'r': 128 raw = true; 129 break; 130 131 case 'f': 132 cur_function = true; 133 some_location_specified = true; 134 break; 135 136 case 'a': 137 if (!arch.SetTriple (option_arg, m_interpreter.GetPlatform (true).get())) 138 arch.SetTriple (option_arg); 139 break; 140 141 default: 142 error.SetErrorStringWithFormat("unrecognized short option '%c'", short_option); 143 break; 144 } 145 146 return error; 147 } 148 149 void 150 CommandObjectDisassemble::CommandOptions::OptionParsingStarting () 151 { 152 show_mixed = false; 153 show_bytes = false; 154 num_lines_context = 0; 155 num_instructions = 0; 156 func_name.clear(); 157 cur_function = false; 158 at_pc = false; 159 frame_line = false; 160 start_addr = LLDB_INVALID_ADDRESS; 161 end_addr = LLDB_INVALID_ADDRESS; 162 raw = false; 163 plugin_name.clear(); 164 arch.Clear(); 165 some_location_specified = false; 166 } 167 168 Error 169 CommandObjectDisassemble::CommandOptions::OptionParsingFinished () 170 { 171 if (!some_location_specified) 172 at_pc = true; 173 return Error(); 174 175 } 176 177 const OptionDefinition* 178 CommandObjectDisassemble::CommandOptions::GetDefinitions () 179 { 180 return g_option_table; 181 } 182 183 OptionDefinition 184 CommandObjectDisassemble::CommandOptions::g_option_table[] = 185 { 186 { LLDB_OPT_SET_ALL , false , "bytes", 'b', no_argument , NULL, 0, eArgTypeNone, "Show opcode bytes when disassembling."}, 187 { LLDB_OPT_SET_ALL , false , "context", 'C', required_argument , NULL, 0, eArgTypeNumLines, "Number of context lines of source to show."}, 188 { LLDB_OPT_SET_ALL , false , "mixed", 'm', no_argument , NULL, 0, eArgTypeNone, "Enable mixed source and assembly display."}, 189 { LLDB_OPT_SET_ALL , false , "raw", 'r', no_argument , NULL, 0, eArgTypeNone, "Print raw disassembly with no symbol information."}, 190 { LLDB_OPT_SET_ALL , false , "plugin", 'P', required_argument , NULL, 0, eArgTypePlugin, "Name of the disassembler plugin you want to use."}, 191 { LLDB_OPT_SET_ALL , false , "arch", 'a', required_argument , NULL, 0, eArgTypeArchitecture,"Specify the architecture to use from cross disassembly."}, 192 { LLDB_OPT_SET_1 | 193 LLDB_OPT_SET_2 , true , "start-address" , 's', required_argument , NULL, 0, eArgTypeStartAddress,"Address at which to start disassembling."}, 194 { LLDB_OPT_SET_1 , false , "end-address" , 'e', required_argument , NULL, 0, eArgTypeEndAddress, "Address at which to end disassembling."}, 195 { LLDB_OPT_SET_2 | 196 LLDB_OPT_SET_3 | 197 LLDB_OPT_SET_4 | 198 LLDB_OPT_SET_5 , false , "count", 'c', required_argument , NULL, 0, eArgTypeNumLines, "Number of instructions to display."}, 199 { LLDB_OPT_SET_3 , false , "name", 'n', required_argument , NULL, CommandCompletions::eSymbolCompletion, eArgTypeFunctionName, "Disassemble entire contents of the given function name."}, 200 { LLDB_OPT_SET_4 , false , "frame", 'f', no_argument , NULL, 0, eArgTypeNone, "Disassemble from the start of the current frame's function."}, 201 { LLDB_OPT_SET_5 , false , "pc", 'p', no_argument , NULL, 0, eArgTypeNone, "Disassemble around the current pc."}, 202 { LLDB_OPT_SET_6 , false , "line", 'l', no_argument , NULL, 0, eArgTypeNone, "Disassemble the current frame's current source line instructions if there debug line table information, else disasemble around the pc."}, 203 { 0 , false , NULL, 0, 0 , NULL, 0, eArgTypeNone, NULL } 204 }; 205 206 207 208 //------------------------------------------------------------------------- 209 // CommandObjectDisassemble 210 //------------------------------------------------------------------------- 211 212 CommandObjectDisassemble::CommandObjectDisassemble (CommandInterpreter &interpreter) : 213 CommandObjectParsed (interpreter, 214 "disassemble", 215 "Disassemble bytes in the current function, or elsewhere in the executable program as specified by the user.", 216 "disassemble [<cmd-options>]"), 217 m_options (interpreter) 218 { 219 } 220 221 CommandObjectDisassemble::~CommandObjectDisassemble() 222 { 223 } 224 225 bool 226 CommandObjectDisassemble::DoExecute (Args& command, CommandReturnObject &result) 227 { 228 Target *target = m_interpreter.GetDebugger().GetSelectedTarget().get(); 229 if (target == NULL) 230 { 231 result.AppendError ("invalid target, create a debug target using the 'target create' command"); 232 result.SetStatus (eReturnStatusFailed); 233 return false; 234 } 235 if (!m_options.arch.IsValid()) 236 m_options.arch = target->GetArchitecture(); 237 238 if (!m_options.arch.IsValid()) 239 { 240 result.AppendError ("use the --arch option or set the target architecure to disassemble"); 241 result.SetStatus (eReturnStatusFailed); 242 return false; 243 } 244 245 const char *plugin_name = m_options.GetPluginName (); 246 DisassemblerSP disassembler = Disassembler::FindPlugin(m_options.arch, plugin_name); 247 248 if (!disassembler) 249 { 250 if (plugin_name) 251 result.AppendErrorWithFormat ("Unable to find Disassembler plug-in named '%s' that supports the '%s' architecture.\n", 252 plugin_name, 253 m_options.arch.GetArchitectureName()); 254 else 255 result.AppendErrorWithFormat ("Unable to find Disassembler plug-in for the '%s' architecture.\n", 256 m_options.arch.GetArchitectureName()); 257 result.SetStatus (eReturnStatusFailed); 258 return false; 259 } 260 261 result.SetStatus (eReturnStatusSuccessFinishResult); 262 263 if (command.GetArgumentCount() != 0) 264 { 265 result.AppendErrorWithFormat ("\"disassemble\" arguments are specified as options.\n"); 266 GetOptions()->GenerateOptionUsage (result.GetErrorStream(), this); 267 result.SetStatus (eReturnStatusFailed); 268 return false; 269 } 270 271 if (m_options.show_mixed && m_options.num_lines_context == 0) 272 m_options.num_lines_context = 1; 273 274 ExecutionContext exe_ctx(m_interpreter.GetExecutionContext()); 275 // Always show the PC in the disassembly 276 uint32_t options = Disassembler::eOptionMarkPCAddress; 277 278 // Mark the source line for the current PC only if we are doing mixed source and assembly 279 if (m_options.show_mixed) 280 options |= Disassembler::eOptionMarkPCSourceLine; 281 282 if (m_options.show_bytes) 283 options |= Disassembler::eOptionShowBytes; 284 285 if (m_options.raw) 286 options |= Disassembler::eOptionRawOuput; 287 288 if (!m_options.func_name.empty()) 289 { 290 ConstString name(m_options.func_name.c_str()); 291 292 if (Disassembler::Disassemble (m_interpreter.GetDebugger(), 293 m_options.arch, 294 plugin_name, 295 exe_ctx, 296 name, 297 NULL, // Module * 298 m_options.num_instructions, 299 m_options.show_mixed ? m_options.num_lines_context : 0, 300 options, 301 result.GetOutputStream())) 302 { 303 result.SetStatus (eReturnStatusSuccessFinishResult); 304 } 305 else 306 { 307 result.AppendErrorWithFormat ("Unable to find symbol with name '%s'.\n", name.GetCString()); 308 result.SetStatus (eReturnStatusFailed); 309 } 310 } 311 else 312 { 313 AddressRange range; 314 StackFrame *frame = exe_ctx.GetFramePtr(); 315 if (m_options.frame_line) 316 { 317 if (frame == NULL) 318 { 319 result.AppendError ("Cannot disassemble around the current line without a selected frame.\n"); 320 result.SetStatus (eReturnStatusFailed); 321 return false; 322 } 323 LineEntry pc_line_entry (frame->GetSymbolContext(eSymbolContextLineEntry).line_entry); 324 if (pc_line_entry.IsValid()) 325 { 326 range = pc_line_entry.range; 327 } 328 else 329 { 330 m_options.at_pc = true; // No line entry, so just disassemble around the current pc 331 m_options.show_mixed = false; 332 } 333 } 334 else if (m_options.cur_function) 335 { 336 if (frame == NULL) 337 { 338 result.AppendError ("Cannot disassemble around the current function without a selected frame.\n"); 339 result.SetStatus (eReturnStatusFailed); 340 return false; 341 } 342 Symbol *symbol = frame->GetSymbolContext(eSymbolContextSymbol).symbol; 343 if (symbol) 344 { 345 range.GetBaseAddress() = symbol->GetAddress(); 346 range.SetByteSize(symbol->GetByteSize()); 347 } 348 } 349 350 // Did the "m_options.frame_line" find a valid range already? If so 351 // skip the rest... 352 if (range.GetByteSize() == 0) 353 { 354 if (m_options.at_pc) 355 { 356 if (frame == NULL) 357 { 358 result.AppendError ("Cannot disassemble around the current PC without a selected frame.\n"); 359 result.SetStatus (eReturnStatusFailed); 360 return false; 361 } 362 range.GetBaseAddress() = frame->GetFrameCodeAddress(); 363 if (m_options.num_instructions == 0) 364 { 365 // Disassembling at the PC always disassembles some number of instructions (not the whole function). 366 m_options.num_instructions = DEFAULT_DISASM_NUM_INS; 367 } 368 } 369 else 370 { 371 range.GetBaseAddress().SetOffset (m_options.start_addr); 372 if (range.GetBaseAddress().IsValid()) 373 { 374 if (m_options.end_addr != LLDB_INVALID_ADDRESS) 375 { 376 if (m_options.end_addr <= m_options.start_addr) 377 { 378 result.AppendErrorWithFormat ("End address before start address.\n"); 379 result.SetStatus (eReturnStatusFailed); 380 return false; 381 } 382 range.SetByteSize (m_options.end_addr - m_options.start_addr); 383 } 384 } 385 } 386 } 387 388 if (m_options.num_instructions != 0) 389 { 390 if (!range.GetBaseAddress().IsValid()) 391 { 392 // The default action is to disassemble the current frame function. 393 if (frame) 394 { 395 SymbolContext sc(frame->GetSymbolContext(eSymbolContextFunction | eSymbolContextSymbol)); 396 if (sc.function) 397 range.GetBaseAddress() = sc.function->GetAddressRange().GetBaseAddress(); 398 else if (sc.symbol && sc.symbol->ValueIsAddress()) 399 range.GetBaseAddress() = sc.symbol->GetAddress(); 400 else 401 range.GetBaseAddress() = frame->GetFrameCodeAddress(); 402 } 403 404 if (!range.GetBaseAddress().IsValid()) 405 { 406 result.AppendError ("invalid frame"); 407 result.SetStatus (eReturnStatusFailed); 408 return false; 409 } 410 } 411 412 if (Disassembler::Disassemble (m_interpreter.GetDebugger(), 413 m_options.arch, 414 plugin_name, 415 exe_ctx, 416 range.GetBaseAddress(), 417 m_options.num_instructions, 418 m_options.show_mixed ? m_options.num_lines_context : 0, 419 options, 420 result.GetOutputStream())) 421 { 422 result.SetStatus (eReturnStatusSuccessFinishResult); 423 } 424 else 425 { 426 result.AppendErrorWithFormat ("Failed to disassemble memory at 0x%8.8llx.\n", m_options.start_addr); 427 result.SetStatus (eReturnStatusFailed); 428 } 429 } 430 else 431 { 432 if (!range.GetBaseAddress().IsValid()) 433 { 434 // The default action is to disassemble the current frame function. 435 if (frame) 436 { 437 SymbolContext sc(frame->GetSymbolContext(eSymbolContextFunction | eSymbolContextSymbol)); 438 if (sc.function) 439 range = sc.function->GetAddressRange(); 440 else if (sc.symbol && sc.symbol->ValueIsAddress()) 441 { 442 range.GetBaseAddress() = sc.symbol->GetAddress(); 443 range.SetByteSize (sc.symbol->GetByteSize()); 444 } 445 else 446 range.GetBaseAddress() = frame->GetFrameCodeAddress(); 447 } 448 else 449 { 450 result.AppendError ("invalid frame"); 451 result.SetStatus (eReturnStatusFailed); 452 return false; 453 } 454 } 455 if (range.GetByteSize() == 0) 456 range.SetByteSize(DEFAULT_DISASM_BYTE_SIZE); 457 458 if (Disassembler::Disassemble (m_interpreter.GetDebugger(), 459 m_options.arch, 460 plugin_name, 461 exe_ctx, 462 range, 463 m_options.num_instructions, 464 m_options.show_mixed ? m_options.num_lines_context : 0, 465 options, 466 result.GetOutputStream())) 467 { 468 result.SetStatus (eReturnStatusSuccessFinishResult); 469 } 470 else 471 { 472 result.AppendErrorWithFormat ("Failed to disassemble memory at 0x%8.8llx.\n", m_options.start_addr); 473 result.SetStatus (eReturnStatusFailed); 474 } 475 } 476 } 477 478 return result.Succeeded(); 479 } 480