1 //===-- StackFrame.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/Target/StackFrame.h" 11 12 // C Includes 13 // C++ Includes 14 // Other libraries and framework includes 15 // Project includes 16 #include "lldb/Core/Module.h" 17 #include "lldb/Core/Debugger.h" 18 #include "lldb/Core/Disassembler.h" 19 #include "lldb/Core/Value.h" 20 #include "lldb/Core/ValueObjectVariable.h" 21 #include "lldb/Core/ValueObjectConstResult.h" 22 #include "lldb/Symbol/Function.h" 23 #include "lldb/Symbol/VariableList.h" 24 #include "lldb/Target/ExecutionContext.h" 25 #include "lldb/Target/Process.h" 26 #include "lldb/Target/RegisterContext.h" 27 #include "lldb/Target/Target.h" 28 #include "lldb/Target/Thread.h" 29 30 using namespace lldb; 31 using namespace lldb_private; 32 33 // The first bits in the flags are reserved for the SymbolContext::Scope bits 34 // so we know if we have tried to look up information in our internal symbol 35 // context (m_sc) already. 36 #define RESOLVED_FRAME_CODE_ADDR (uint32_t(eSymbolContextEverything + 1)) 37 #define RESOLVED_FRAME_ID_SYMBOL_SCOPE (RESOLVED_FRAME_CODE_ADDR << 1) 38 #define GOT_FRAME_BASE (RESOLVED_FRAME_ID_SYMBOL_SCOPE << 1) 39 #define RESOLVED_VARIABLES (GOT_FRAME_BASE << 1) 40 #define RESOLVED_GLOBAL_VARIABLES (RESOLVED_VARIABLES << 1) 41 42 StackFrame::StackFrame 43 ( 44 lldb::user_id_t frame_idx, 45 lldb::user_id_t unwind_frame_index, 46 Thread &thread, 47 lldb::addr_t cfa, 48 lldb::addr_t pc, 49 const SymbolContext *sc_ptr 50 ) : 51 m_thread (thread), 52 m_frame_index (frame_idx), 53 m_concrete_frame_index (unwind_frame_index), 54 m_reg_context_sp (), 55 m_id (pc, cfa, NULL), 56 m_frame_code_addr (NULL, pc), 57 m_sc (), 58 m_flags (), 59 m_frame_base (), 60 m_frame_base_error (), 61 m_variable_list_sp (), 62 m_variable_list_value_objects (), 63 m_disassembly () 64 { 65 if (sc_ptr != NULL) 66 { 67 m_sc = *sc_ptr; 68 m_flags.Set(m_sc.GetResolvedMask ()); 69 } 70 } 71 72 StackFrame::StackFrame 73 ( 74 lldb::user_id_t frame_idx, 75 lldb::user_id_t unwind_frame_index, 76 Thread &thread, 77 const RegisterContextSP ®_context_sp, 78 lldb::addr_t cfa, 79 lldb::addr_t pc, 80 const SymbolContext *sc_ptr 81 ) : 82 m_thread (thread), 83 m_frame_index (frame_idx), 84 m_concrete_frame_index (unwind_frame_index), 85 m_reg_context_sp (reg_context_sp), 86 m_id (pc, cfa, NULL), 87 m_frame_code_addr (NULL, pc), 88 m_sc (), 89 m_flags (), 90 m_frame_base (), 91 m_frame_base_error (), 92 m_variable_list_sp (), 93 m_variable_list_value_objects (), 94 m_disassembly () 95 { 96 if (sc_ptr != NULL) 97 { 98 m_sc = *sc_ptr; 99 m_flags.Set(m_sc.GetResolvedMask ()); 100 } 101 102 if (reg_context_sp && !m_sc.target_sp) 103 { 104 m_sc.target_sp = reg_context_sp->GetThread().GetProcess().GetTarget().GetSP(); 105 m_flags.Set (eSymbolContextTarget); 106 } 107 } 108 109 StackFrame::StackFrame 110 ( 111 lldb::user_id_t frame_idx, 112 lldb::user_id_t unwind_frame_index, 113 Thread &thread, 114 const RegisterContextSP ®_context_sp, 115 lldb::addr_t cfa, 116 const Address& pc_addr, 117 const SymbolContext *sc_ptr 118 ) : 119 m_thread (thread), 120 m_frame_index (frame_idx), 121 m_concrete_frame_index (unwind_frame_index), 122 m_reg_context_sp (reg_context_sp), 123 m_id (pc_addr.GetLoadAddress (&thread.GetProcess().GetTarget()), cfa, NULL), 124 m_frame_code_addr (pc_addr), 125 m_sc (), 126 m_flags (), 127 m_frame_base (), 128 m_frame_base_error (), 129 m_variable_list_sp (), 130 m_variable_list_value_objects (), 131 m_disassembly () 132 { 133 if (sc_ptr != NULL) 134 { 135 m_sc = *sc_ptr; 136 m_flags.Set(m_sc.GetResolvedMask ()); 137 } 138 139 if (m_sc.target_sp.get() == NULL && reg_context_sp) 140 { 141 m_sc.target_sp = reg_context_sp->GetThread().GetProcess().GetTarget().GetSP(); 142 m_flags.Set (eSymbolContextTarget); 143 } 144 145 Module *pc_module = pc_addr.GetModule(); 146 if (m_sc.module_sp.get() == NULL || m_sc.module_sp.get() != pc_module) 147 { 148 if (pc_module) 149 { 150 m_sc.module_sp = pc_module->GetSP(); 151 m_flags.Set (eSymbolContextModule); 152 } 153 else 154 { 155 m_sc.module_sp.reset(); 156 } 157 158 } 159 } 160 161 162 //---------------------------------------------------------------------- 163 // Destructor 164 //---------------------------------------------------------------------- 165 StackFrame::~StackFrame() 166 { 167 } 168 169 StackID& 170 StackFrame::GetStackID() 171 { 172 // Make sure we have resolved the StackID object's symbol context scope if 173 // we already haven't looked it up. 174 175 if (m_flags.IsClear (RESOLVED_FRAME_ID_SYMBOL_SCOPE)) 176 { 177 if (m_id.GetSymbolContextScope ()) 178 { 179 // We already have a symbol context scope, we just don't have our 180 // flag bit set. 181 m_flags.Set (RESOLVED_FRAME_ID_SYMBOL_SCOPE); 182 } 183 else 184 { 185 // Calculate the frame block and use this for the stack ID symbol 186 // context scope if we have one. 187 SymbolContextScope *scope = GetFrameBlock (); 188 if (scope == NULL) 189 { 190 // We don't have a block, so use the symbol 191 if (m_flags.IsClear (eSymbolContextSymbol)) 192 GetSymbolContext (eSymbolContextSymbol); 193 194 // It is ok if m_sc.symbol is NULL here 195 scope = m_sc.symbol; 196 } 197 // Set the symbol context scope (the accessor will set the 198 // RESOLVED_FRAME_ID_SYMBOL_SCOPE bit in m_flags). 199 SetSymbolContextScope (scope); 200 } 201 } 202 return m_id; 203 } 204 205 void 206 StackFrame::SetSymbolContextScope (SymbolContextScope *symbol_scope) 207 { 208 m_flags.Set (RESOLVED_FRAME_ID_SYMBOL_SCOPE); 209 m_id.SetSymbolContextScope (symbol_scope); 210 } 211 212 const Address& 213 StackFrame::GetFrameCodeAddress() 214 { 215 if (m_flags.IsClear(RESOLVED_FRAME_CODE_ADDR) && !m_frame_code_addr.IsSectionOffset()) 216 { 217 m_flags.Set (RESOLVED_FRAME_CODE_ADDR); 218 219 // Resolve the PC into a temporary address because if ResolveLoadAddress 220 // fails to resolve the address, it will clear the address object... 221 222 if (m_frame_code_addr.SetOpcodeLoadAddress (m_frame_code_addr.GetOffset(), &m_thread.GetProcess().GetTarget())) 223 { 224 const Section *section = m_frame_code_addr.GetSection(); 225 if (section) 226 { 227 Module *module = section->GetModule(); 228 if (module) 229 { 230 m_sc.module_sp = module->GetSP(); 231 if (m_sc.module_sp) 232 m_flags.Set(eSymbolContextModule); 233 } 234 } 235 } 236 } 237 return m_frame_code_addr; 238 } 239 240 void 241 StackFrame::ChangePC (addr_t pc) 242 { 243 m_frame_code_addr.SetOffset(pc); 244 m_frame_code_addr.SetSection(NULL); 245 m_sc.Clear(); 246 m_flags.Reset(0); 247 m_thread.ClearStackFrames (); 248 } 249 250 const char * 251 StackFrame::Disassemble () 252 { 253 if (m_disassembly.GetSize() == 0) 254 { 255 ExecutionContext exe_ctx; 256 CalculateExecutionContext(exe_ctx); 257 Target &target = m_thread.GetProcess().GetTarget(); 258 Disassembler::Disassemble (target.GetDebugger(), 259 target.GetArchitecture(), 260 NULL, 261 exe_ctx, 262 0, 263 0, 264 0, 265 m_disassembly); 266 if (m_disassembly.GetSize() == 0) 267 return NULL; 268 } 269 return m_disassembly.GetData(); 270 } 271 272 Block * 273 StackFrame::GetFrameBlock () 274 { 275 if (m_sc.block == NULL && m_flags.IsClear (eSymbolContextBlock)) 276 GetSymbolContext (eSymbolContextBlock); 277 278 if (m_sc.block) 279 { 280 Block *inline_block = m_sc.block->GetContainingInlinedBlock(); 281 if (inline_block) 282 { 283 // Use the block with the inlined function info 284 // as the frame block we want this frame to have only the variables 285 // for the inlined function and its non-inlined block child blocks. 286 return inline_block; 287 } 288 else 289 { 290 // This block is not contained withing any inlined function blocks 291 // with so we want to use the top most function block. 292 return &m_sc.function->GetBlock (false); 293 } 294 } 295 return NULL; 296 } 297 298 //---------------------------------------------------------------------- 299 // Get the symbol context if we already haven't done so by resolving the 300 // PC address as much as possible. This way when we pass around a 301 // StackFrame object, everyone will have as much information as 302 // possible and no one will ever have to look things up manually. 303 //---------------------------------------------------------------------- 304 const SymbolContext& 305 StackFrame::GetSymbolContext (uint32_t resolve_scope) 306 { 307 // Copy our internal symbol context into "sc". 308 if ((m_flags.Get() & resolve_scope) != resolve_scope) 309 { 310 // Resolve our PC to section offset if we haven't alreday done so 311 // and if we don't have a module. The resolved address section will 312 // contain the module to which it belongs 313 if (!m_sc.module_sp && m_flags.IsClear(RESOLVED_FRAME_CODE_ADDR)) 314 GetFrameCodeAddress(); 315 316 // If this is not frame zero, then we need to subtract 1 from the PC 317 // value when doing address lookups since the PC will be on the 318 // instruction following the function call instruction... 319 320 Address lookup_addr(GetFrameCodeAddress()); 321 if (m_frame_index > 0 && lookup_addr.IsValid()) 322 { 323 addr_t offset = lookup_addr.GetOffset(); 324 if (offset > 0) 325 lookup_addr.SetOffset(offset - 1); 326 } 327 328 329 uint32_t resolved = 0; 330 if (m_sc.module_sp) 331 { 332 // We have something in our stack frame symbol context, lets check 333 // if we haven't already tried to lookup one of those things. If we 334 // haven't then we will do the query. 335 336 uint32_t actual_resolve_scope = 0; 337 338 if (resolve_scope & eSymbolContextCompUnit) 339 { 340 if (m_flags.IsClear (eSymbolContextCompUnit)) 341 { 342 if (m_sc.comp_unit) 343 resolved |= eSymbolContextCompUnit; 344 else 345 actual_resolve_scope |= eSymbolContextCompUnit; 346 } 347 } 348 349 if (resolve_scope & eSymbolContextFunction) 350 { 351 if (m_flags.IsClear (eSymbolContextFunction)) 352 { 353 if (m_sc.function) 354 resolved |= eSymbolContextFunction; 355 else 356 actual_resolve_scope |= eSymbolContextFunction; 357 } 358 } 359 360 if (resolve_scope & eSymbolContextBlock) 361 { 362 if (m_flags.IsClear (eSymbolContextBlock)) 363 { 364 if (m_sc.block) 365 resolved |= eSymbolContextBlock; 366 else 367 actual_resolve_scope |= eSymbolContextBlock; 368 } 369 } 370 371 if (resolve_scope & eSymbolContextSymbol) 372 { 373 if (m_flags.IsClear (eSymbolContextSymbol)) 374 { 375 if (m_sc.symbol) 376 resolved |= eSymbolContextSymbol; 377 else 378 actual_resolve_scope |= eSymbolContextSymbol; 379 } 380 } 381 382 if (resolve_scope & eSymbolContextLineEntry) 383 { 384 if (m_flags.IsClear (eSymbolContextLineEntry)) 385 { 386 if (m_sc.line_entry.IsValid()) 387 resolved |= eSymbolContextLineEntry; 388 else 389 actual_resolve_scope |= eSymbolContextLineEntry; 390 } 391 } 392 393 if (actual_resolve_scope) 394 { 395 // We might be resolving less information than what is already 396 // in our current symbol context so resolve into a temporary 397 // symbol context "sc" so we don't clear out data we have 398 // already found in "m_sc" 399 SymbolContext sc; 400 // Set flags that indicate what we have tried to resolve 401 resolved |= m_sc.module_sp->ResolveSymbolContextForAddress (lookup_addr, actual_resolve_scope, sc); 402 // Only replace what we didn't already have as we may have 403 // information for an inlined function scope that won't match 404 // what a standard lookup by address would match 405 if ((resolved & eSymbolContextCompUnit) && m_sc.comp_unit == NULL) 406 m_sc.comp_unit = sc.comp_unit; 407 if ((resolved & eSymbolContextFunction) && m_sc.function == NULL) 408 m_sc.function = sc.function; 409 if ((resolved & eSymbolContextBlock) && m_sc.block == NULL) 410 m_sc.block = sc.block; 411 if ((resolved & eSymbolContextSymbol) && m_sc.symbol == NULL) 412 m_sc.symbol = sc.symbol; 413 if ((resolved & eSymbolContextLineEntry) && !m_sc.line_entry.IsValid()) 414 m_sc.line_entry = sc.line_entry; 415 416 } 417 } 418 else 419 { 420 // If we don't have a module, then we can't have the compile unit, 421 // function, block, line entry or symbol, so we can safely call 422 // ResolveSymbolContextForAddress with our symbol context member m_sc. 423 resolved |= m_thread.GetProcess().GetTarget().GetImages().ResolveSymbolContextForAddress (lookup_addr, resolve_scope, m_sc); 424 } 425 426 // If the target was requested add that: 427 if (m_sc.target_sp.get() == NULL) 428 { 429 m_sc.target_sp = CalculateProcess()->GetTarget().GetSP(); 430 if (m_sc.target_sp) 431 resolved |= eSymbolContextTarget; 432 } 433 434 // Update our internal flags so we remember what we have tried to locate so 435 // we don't have to keep trying when more calls to this function are made. 436 // We might have dug up more information that was requested (for example 437 // if we were asked to only get the block, we will have gotten the 438 // compile unit, and function) so set any additional bits that we resolved 439 m_flags.Set (resolve_scope | resolved); 440 } 441 442 // Return the symbol context with everything that was possible to resolve 443 // resolved. 444 return m_sc; 445 } 446 447 448 VariableList * 449 StackFrame::GetVariableList (bool get_file_globals) 450 { 451 if (m_flags.IsClear(RESOLVED_VARIABLES)) 452 { 453 m_flags.Set(RESOLVED_VARIABLES); 454 455 Block *frame_block = GetFrameBlock(); 456 457 if (frame_block) 458 { 459 const bool get_child_variables = true; 460 const bool can_create = true; 461 const bool stop_if_child_block_is_inlined_function = true; 462 m_variable_list_sp.reset(new VariableList()); 463 frame_block->AppendBlockVariables(can_create, get_child_variables, stop_if_child_block_is_inlined_function, m_variable_list_sp.get()); 464 } 465 } 466 467 if (m_flags.IsClear(RESOLVED_GLOBAL_VARIABLES) && 468 get_file_globals) 469 { 470 m_flags.Set(RESOLVED_GLOBAL_VARIABLES); 471 472 if (m_flags.IsClear (eSymbolContextCompUnit)) 473 GetSymbolContext (eSymbolContextCompUnit); 474 475 if (m_sc.comp_unit) 476 { 477 VariableListSP global_variable_list_sp (m_sc.comp_unit->GetVariableList(true)); 478 if (m_variable_list_sp) 479 m_variable_list_sp->AddVariables (global_variable_list_sp.get()); 480 else 481 m_variable_list_sp = global_variable_list_sp; 482 } 483 } 484 485 return m_variable_list_sp.get(); 486 } 487 488 ValueObjectSP 489 StackFrame::GetValueForVariableExpressionPath (const char *var_expr_cstr, 490 lldb::DynamicValueType use_dynamic, 491 uint32_t options, 492 lldb::VariableSP &var_sp, 493 Error &error) 494 { 495 496 if (var_expr_cstr && var_expr_cstr[0]) 497 { 498 const bool check_ptr_vs_member = (options & eExpressionPathOptionCheckPtrVsMember) != 0; 499 const bool no_fragile_ivar = (options & eExpressionPathOptionsNoFragileObjcIvar) != 0; 500 error.Clear(); 501 bool deref = false; 502 bool address_of = false; 503 ValueObjectSP valobj_sp; 504 const bool get_file_globals = true; 505 VariableList *variable_list = GetVariableList (get_file_globals); 506 507 if (variable_list) 508 { 509 // If first character is a '*', then show pointer contents 510 const char *var_expr = var_expr_cstr; 511 if (var_expr[0] == '*') 512 { 513 deref = true; 514 var_expr++; // Skip the '*' 515 } 516 else if (var_expr[0] == '&') 517 { 518 address_of = true; 519 var_expr++; // Skip the '&' 520 } 521 522 std::string var_path (var_expr); 523 size_t separator_idx = var_path.find_first_of(".-[=+~|&^%#@!/?,<>{}"); 524 StreamString var_expr_path_strm; 525 526 ConstString name_const_string; 527 if (separator_idx == std::string::npos) 528 name_const_string.SetCString (var_path.c_str()); 529 else 530 name_const_string.SetCStringWithLength (var_path.c_str(), separator_idx); 531 532 var_sp = variable_list->FindVariable(name_const_string); 533 if (var_sp) 534 { 535 valobj_sp = GetValueObjectForFrameVariable (var_sp, use_dynamic); 536 if (!valobj_sp) 537 return valobj_sp; 538 539 var_path.erase (0, name_const_string.GetLength ()); 540 // We are dumping at least one child 541 while (separator_idx != std::string::npos) 542 { 543 // Calculate the next separator index ahead of time 544 ValueObjectSP child_valobj_sp; 545 const char separator_type = var_path[0]; 546 switch (separator_type) 547 { 548 549 case '-': 550 if (var_path.size() >= 2 && var_path[1] != '>') 551 return ValueObjectSP(); 552 553 if (no_fragile_ivar) 554 { 555 // Make sure we aren't trying to deref an objective 556 // C ivar if this is not allowed 557 const uint32_t pointer_type_flags = ClangASTContext::GetTypeInfo (valobj_sp->GetClangType(), NULL, NULL); 558 if ((pointer_type_flags & ClangASTContext::eTypeIsObjC) && 559 (pointer_type_flags & ClangASTContext::eTypeIsPointer)) 560 { 561 // This was an objective C object pointer and 562 // it was requested we skip any fragile ivars 563 // so return nothing here 564 return ValueObjectSP(); 565 } 566 } 567 var_path.erase (0, 1); // Remove the '-' 568 // Fall through 569 case '.': 570 { 571 const bool expr_is_ptr = var_path[0] == '>'; 572 573 var_path.erase (0, 1); // Remove the '.' or '>' 574 separator_idx = var_path.find_first_of(".-["); 575 ConstString child_name; 576 if (separator_idx == std::string::npos) 577 child_name.SetCString (var_path.c_str()); 578 else 579 child_name.SetCStringWithLength(var_path.c_str(), separator_idx); 580 581 if (check_ptr_vs_member) 582 { 583 // We either have a pointer type and need to verify 584 // valobj_sp is a pointer, or we have a member of a 585 // class/union/struct being accessed with the . syntax 586 // and need to verify we don't have a pointer. 587 const bool actual_is_ptr = valobj_sp->IsPointerType (); 588 589 if (actual_is_ptr != expr_is_ptr) 590 { 591 // Incorrect use of "." with a pointer, or "->" with 592 // a class/union/struct instance or reference. 593 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 594 if (actual_is_ptr) 595 error.SetErrorStringWithFormat ("\"%s\" is a pointer and . was used to attempt to access \"%s\". Did you mean \"%s->%s\"?", 596 var_expr_path_strm.GetString().c_str(), 597 child_name.GetCString(), 598 var_expr_path_strm.GetString().c_str(), 599 var_path.c_str()); 600 else 601 error.SetErrorStringWithFormat ("\"%s\" is not a pointer and -> was used to attempt to access \"%s\". Did you mean \"%s.%s\"?", 602 var_expr_path_strm.GetString().c_str(), 603 child_name.GetCString(), 604 var_expr_path_strm.GetString().c_str(), 605 var_path.c_str()); 606 return ValueObjectSP(); 607 } 608 } 609 child_valobj_sp = valobj_sp->GetChildMemberWithName (child_name, true); 610 if (!child_valobj_sp) 611 { 612 // No child member with name "child_name" 613 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 614 if (child_name) 615 { 616 error.SetErrorStringWithFormat ("\"%s\" is not a member of \"(%s) %s\"", 617 child_name.GetCString(), 618 valobj_sp->GetTypeName().AsCString("<invalid type>"), 619 var_expr_path_strm.GetString().c_str()); 620 } 621 else 622 { 623 error.SetErrorStringWithFormat ("incomplete expression path after \"%s\" in \"%s\"", 624 var_expr_path_strm.GetString().c_str(), 625 var_expr_cstr); 626 } 627 628 return ValueObjectSP(); 629 } 630 // Remove the child name from the path 631 var_path.erase(0, child_name.GetLength()); 632 if (use_dynamic != lldb::eNoDynamicValues) 633 { 634 ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic)); 635 if (dynamic_value_sp) 636 child_valobj_sp = dynamic_value_sp; 637 } 638 } 639 break; 640 641 case '[': 642 // Array member access, or treating pointer as an array 643 if (var_path.size() > 2) // Need at least two brackets and a number 644 { 645 char *end = NULL; 646 long child_index = ::strtol (&var_path[1], &end, 0); 647 if (end && *end == ']' 648 && *(end-1) != '[') // this code forces an error in the case of arr[]. as bitfield[] is not a good syntax we're good to go 649 { 650 if (ClangASTContext::IsPointerToScalarType(valobj_sp->GetClangType()) && deref) 651 { 652 // what we have is *ptr[low]. the most similar C++ syntax is to deref ptr 653 // and extract bit low out of it. reading array item low 654 // would be done by saying ptr[low], without a deref * sign 655 Error error; 656 ValueObjectSP temp(valobj_sp->Dereference(error)); 657 if (error.Fail()) 658 { 659 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 660 error.SetErrorStringWithFormat ("could not dereference \"(%s) %s\"", 661 valobj_sp->GetTypeName().AsCString("<invalid type>"), 662 var_expr_path_strm.GetString().c_str()); 663 return ValueObjectSP(); 664 } 665 valobj_sp = temp; 666 deref = false; 667 } 668 else if (ClangASTContext::IsArrayOfScalarType(valobj_sp->GetClangType()) && deref) 669 { 670 // what we have is *arr[low]. the most similar C++ syntax is to get arr[0] 671 // (an operation that is equivalent to deref-ing arr) 672 // and extract bit low out of it. reading array item low 673 // would be done by saying arr[low], without a deref * sign 674 Error error; 675 ValueObjectSP temp(valobj_sp->GetChildAtIndex (0, true)); 676 if (error.Fail()) 677 { 678 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 679 error.SetErrorStringWithFormat ("could not get item 0 for \"(%s) %s\"", 680 valobj_sp->GetTypeName().AsCString("<invalid type>"), 681 var_expr_path_strm.GetString().c_str()); 682 return ValueObjectSP(); 683 } 684 valobj_sp = temp; 685 deref = false; 686 } 687 688 if (valobj_sp->IsPointerType ()) 689 { 690 child_valobj_sp = valobj_sp->GetSyntheticArrayMemberFromPointer (child_index, true); 691 if (!child_valobj_sp) 692 { 693 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 694 error.SetErrorStringWithFormat ("failed to use pointer as array for index %i for \"(%s) %s\"", 695 child_index, 696 valobj_sp->GetTypeName().AsCString("<invalid type>"), 697 var_expr_path_strm.GetString().c_str()); 698 } 699 } 700 else if (ClangASTContext::IsArrayType (valobj_sp->GetClangType(), NULL, NULL)) 701 { 702 // Pass false to dynamic_value here so we can tell the difference between 703 // no dynamic value and no member of this type... 704 child_valobj_sp = valobj_sp->GetChildAtIndex (child_index, true); 705 if (!child_valobj_sp) 706 { 707 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 708 error.SetErrorStringWithFormat ("array index %i is not valid for \"(%s) %s\"", 709 child_index, 710 valobj_sp->GetTypeName().AsCString("<invalid type>"), 711 var_expr_path_strm.GetString().c_str()); 712 } 713 } 714 else if (ClangASTContext::IsScalarType(valobj_sp->GetClangType())) 715 { 716 // this is a bitfield asking to display just one bit 717 child_valobj_sp = valobj_sp->GetSyntheticBitFieldChild(child_index, child_index, true); 718 if (!child_valobj_sp) 719 { 720 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 721 error.SetErrorStringWithFormat ("bitfield range %i-%i is not valid for \"(%s) %s\"", 722 child_index, child_index, 723 valobj_sp->GetTypeName().AsCString("<invalid type>"), 724 var_expr_path_strm.GetString().c_str()); 725 } 726 } 727 else 728 { 729 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 730 error.SetErrorStringWithFormat ("\"(%s) %s\" is not an array type", 731 valobj_sp->GetTypeName().AsCString("<invalid type>"), 732 var_expr_path_strm.GetString().c_str()); 733 } 734 735 if (!child_valobj_sp) 736 { 737 // Invalid array index... 738 return ValueObjectSP(); 739 } 740 741 // Erase the array member specification '[%i]' where 742 // %i is the array index 743 var_path.erase(0, (end - var_path.c_str()) + 1); 744 separator_idx = var_path.find_first_of(".-["); 745 if (use_dynamic != lldb::eNoDynamicValues) 746 { 747 ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic)); 748 if (dynamic_value_sp) 749 child_valobj_sp = dynamic_value_sp; 750 } 751 // Break out early from the switch since we were 752 // able to find the child member 753 break; 754 } 755 else if(end && *end == '-') 756 { 757 // this is most probably a BitField, let's take a look 758 char *real_end = NULL; 759 long final_index = ::strtol (end+1, &real_end, 0); 760 if(real_end && *real_end == ']') 761 { 762 // if the format given is [high-low], swap range 763 if(child_index > final_index) 764 { 765 long temp = child_index; 766 child_index = final_index; 767 final_index = temp; 768 } 769 770 if (ClangASTContext::IsPointerToScalarType(valobj_sp->GetClangType()) && deref) 771 { 772 // what we have is *ptr[low-high]. the most similar C++ syntax is to deref ptr 773 // and extract bits low thru high out of it. reading array items low thru high 774 // would be done by saying ptr[low-high], without a deref * sign 775 Error error; 776 ValueObjectSP temp(valobj_sp->Dereference(error)); 777 if (error.Fail()) 778 { 779 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 780 error.SetErrorStringWithFormat ("could not dereference \"(%s) %s\"", 781 valobj_sp->GetTypeName().AsCString("<invalid type>"), 782 var_expr_path_strm.GetString().c_str()); 783 return ValueObjectSP(); 784 } 785 valobj_sp = temp; 786 deref = false; 787 } 788 else if (ClangASTContext::IsArrayOfScalarType(valobj_sp->GetClangType()) && deref) 789 { 790 // what we have is *arr[low-high]. the most similar C++ syntax is to get arr[0] 791 // (an operation that is equivalent to deref-ing arr) 792 // and extract bits low thru high out of it. reading array items low thru high 793 // would be done by saying arr[low-high], without a deref * sign 794 Error error; 795 ValueObjectSP temp(valobj_sp->GetChildAtIndex (0, true)); 796 if (error.Fail()) 797 { 798 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 799 error.SetErrorStringWithFormat ("could not get item 0 for \"(%s) %s\"", 800 valobj_sp->GetTypeName().AsCString("<invalid type>"), 801 var_expr_path_strm.GetString().c_str()); 802 return ValueObjectSP(); 803 } 804 valobj_sp = temp; 805 deref = false; 806 } 807 808 child_valobj_sp = valobj_sp->GetSyntheticBitFieldChild(child_index, final_index, true); 809 if (!child_valobj_sp) 810 { 811 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 812 error.SetErrorStringWithFormat ("bitfield range %i-%i is not valid for \"(%s) %s\"", 813 child_index, final_index, 814 valobj_sp->GetTypeName().AsCString("<invalid type>"), 815 var_expr_path_strm.GetString().c_str()); 816 } 817 } 818 819 if (!child_valobj_sp) 820 { 821 // Invalid bitfield range... 822 return ValueObjectSP(); 823 } 824 825 // Erase the bitfield member specification '[%i-%i]' where 826 // %i is the index 827 var_path.erase(0, (real_end - var_path.c_str()) + 1); 828 separator_idx = var_path.find_first_of(".-["); 829 if (use_dynamic != lldb::eNoDynamicValues) 830 { 831 ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic)); 832 if (dynamic_value_sp) 833 child_valobj_sp = dynamic_value_sp; 834 } 835 // Break out early from the switch since we were 836 // able to find the child member 837 break; 838 839 } 840 } 841 else 842 { 843 error.SetErrorStringWithFormat("invalid square bracket encountered after \"%s\" in \"%s\"", 844 var_expr_path_strm.GetString().c_str(), 845 var_path.c_str()); 846 } 847 return ValueObjectSP(); 848 849 default: 850 // Failure... 851 { 852 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 853 error.SetErrorStringWithFormat ("unexpected char '%c' encountered after \"%s\" in \"%s\"", 854 separator_type, 855 var_expr_path_strm.GetString().c_str(), 856 var_path.c_str()); 857 858 return ValueObjectSP(); 859 } 860 } 861 862 if (child_valobj_sp) 863 valobj_sp = child_valobj_sp; 864 865 if (var_path.empty()) 866 break; 867 868 } 869 if (valobj_sp) 870 { 871 if (deref) 872 { 873 ValueObjectSP deref_valobj_sp (valobj_sp->Dereference(error)); 874 valobj_sp = deref_valobj_sp; 875 } 876 else if (address_of) 877 { 878 ValueObjectSP address_of_valobj_sp (valobj_sp->AddressOf(error)); 879 valobj_sp = address_of_valobj_sp; 880 } 881 } 882 return valobj_sp; 883 } 884 else 885 { 886 error.SetErrorStringWithFormat("no variable named '%s' found in this frame", 887 name_const_string.GetCString()); 888 } 889 } 890 } 891 else 892 { 893 error.SetErrorStringWithFormat("invalid variable path '%s'", var_expr_cstr); 894 } 895 return ValueObjectSP(); 896 } 897 898 bool 899 StackFrame::GetFrameBaseValue (Scalar &frame_base, Error *error_ptr) 900 { 901 if (m_flags.IsClear(GOT_FRAME_BASE)) 902 { 903 if (m_sc.function) 904 { 905 m_frame_base.Clear(); 906 m_frame_base_error.Clear(); 907 908 m_flags.Set(GOT_FRAME_BASE); 909 ExecutionContext exe_ctx (&m_thread.GetProcess(), &m_thread, this); 910 Value expr_value; 911 addr_t loclist_base_addr = LLDB_INVALID_ADDRESS; 912 if (m_sc.function->GetFrameBaseExpression().IsLocationList()) 913 loclist_base_addr = m_sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress (&m_thread.GetProcess().GetTarget()); 914 915 if (m_sc.function->GetFrameBaseExpression().Evaluate(&exe_ctx, NULL, NULL, NULL, NULL, loclist_base_addr, NULL, expr_value, &m_frame_base_error) == false) 916 { 917 // We should really have an error if evaluate returns, but in case 918 // we don't, lets set the error to something at least. 919 if (m_frame_base_error.Success()) 920 m_frame_base_error.SetErrorString("Evaluation of the frame base expression failed."); 921 } 922 else 923 { 924 m_frame_base = expr_value.ResolveValue(&exe_ctx, NULL); 925 } 926 } 927 else 928 { 929 m_frame_base_error.SetErrorString ("No function in symbol context."); 930 } 931 } 932 933 if (m_frame_base_error.Success()) 934 frame_base = m_frame_base; 935 936 if (error_ptr) 937 *error_ptr = m_frame_base_error; 938 return m_frame_base_error.Success(); 939 } 940 941 RegisterContextSP 942 StackFrame::GetRegisterContext () 943 { 944 if (!m_reg_context_sp) 945 m_reg_context_sp = m_thread.CreateRegisterContextForFrame (this); 946 return m_reg_context_sp; 947 } 948 949 bool 950 StackFrame::HasDebugInformation () 951 { 952 GetSymbolContext (eSymbolContextLineEntry); 953 return m_sc.line_entry.IsValid(); 954 } 955 956 957 ValueObjectSP 958 StackFrame::GetValueObjectForFrameVariable (const VariableSP &variable_sp, lldb::DynamicValueType use_dynamic) 959 { 960 ValueObjectSP valobj_sp; 961 VariableList *var_list = GetVariableList (true); 962 if (var_list) 963 { 964 // Make sure the variable is a frame variable 965 const uint32_t var_idx = var_list->FindIndexForVariable (variable_sp.get()); 966 const uint32_t num_variables = var_list->GetSize(); 967 if (var_idx < num_variables) 968 { 969 valobj_sp = m_variable_list_value_objects.GetValueObjectAtIndex (var_idx); 970 if (valobj_sp.get() == NULL) 971 { 972 if (m_variable_list_value_objects.GetSize() < num_variables) 973 m_variable_list_value_objects.Resize(num_variables); 974 valobj_sp = ValueObjectVariable::Create (this, variable_sp); 975 m_variable_list_value_objects.SetValueObjectAtIndex (var_idx, valobj_sp); 976 } 977 } 978 } 979 if (use_dynamic != lldb::eNoDynamicValues && valobj_sp) 980 { 981 ValueObjectSP dynamic_sp = valobj_sp->GetDynamicValue (use_dynamic); 982 if (dynamic_sp) 983 return dynamic_sp; 984 } 985 return valobj_sp; 986 } 987 988 ValueObjectSP 989 StackFrame::TrackGlobalVariable (const VariableSP &variable_sp, lldb::DynamicValueType use_dynamic) 990 { 991 // Check to make sure we aren't already tracking this variable? 992 ValueObjectSP valobj_sp (GetValueObjectForFrameVariable (variable_sp, use_dynamic)); 993 if (!valobj_sp) 994 { 995 // We aren't already tracking this global 996 VariableList *var_list = GetVariableList (true); 997 // If this frame has no variables, create a new list 998 if (var_list == NULL) 999 m_variable_list_sp.reset (new VariableList()); 1000 1001 // Add the global/static variable to this frame 1002 m_variable_list_sp->AddVariable (variable_sp); 1003 1004 // Now make a value object for it so we can track its changes 1005 valobj_sp = GetValueObjectForFrameVariable (variable_sp, use_dynamic); 1006 } 1007 return valobj_sp; 1008 } 1009 1010 bool 1011 StackFrame::IsInlined () 1012 { 1013 if (m_sc.block == NULL) 1014 GetSymbolContext (eSymbolContextBlock); 1015 if (m_sc.block) 1016 return m_sc.block->GetContainingInlinedBlock() != NULL; 1017 return false; 1018 } 1019 1020 Target * 1021 StackFrame::CalculateTarget () 1022 { 1023 return m_thread.CalculateTarget(); 1024 } 1025 1026 Process * 1027 StackFrame::CalculateProcess () 1028 { 1029 return m_thread.CalculateProcess(); 1030 } 1031 1032 Thread * 1033 StackFrame::CalculateThread () 1034 { 1035 return &m_thread; 1036 } 1037 1038 StackFrame * 1039 StackFrame::CalculateStackFrame () 1040 { 1041 return this; 1042 } 1043 1044 1045 void 1046 StackFrame::CalculateExecutionContext (ExecutionContext &exe_ctx) 1047 { 1048 m_thread.CalculateExecutionContext (exe_ctx); 1049 exe_ctx.frame = this; 1050 } 1051 1052 void 1053 StackFrame::DumpUsingSettingsFormat (Stream *strm) 1054 { 1055 if (strm == NULL) 1056 return; 1057 1058 GetSymbolContext(eSymbolContextEverything); 1059 ExecutionContext exe_ctx; 1060 CalculateExecutionContext(exe_ctx); 1061 const char *end = NULL; 1062 StreamString s; 1063 const char *frame_format = m_thread.GetProcess().GetTarget().GetDebugger().GetFrameFormat(); 1064 if (frame_format && Debugger::FormatPrompt (frame_format, &m_sc, &exe_ctx, NULL, s, &end)) 1065 { 1066 strm->Write(s.GetData(), s.GetSize()); 1067 } 1068 else 1069 { 1070 Dump (strm, true, false); 1071 strm->EOL(); 1072 } 1073 } 1074 1075 void 1076 StackFrame::Dump (Stream *strm, bool show_frame_index, bool show_fullpaths) 1077 { 1078 if (strm == NULL) 1079 return; 1080 1081 if (show_frame_index) 1082 strm->Printf("frame #%u: ", m_frame_index); 1083 strm->Printf("0x%0*llx ", m_thread.GetProcess().GetTarget().GetArchitecture().GetAddressByteSize() * 2, GetFrameCodeAddress().GetLoadAddress(&m_thread.GetProcess().GetTarget())); 1084 GetSymbolContext(eSymbolContextEverything); 1085 const bool show_module = true; 1086 const bool show_inline = true; 1087 m_sc.DumpStopContext(strm, &m_thread.GetProcess(), GetFrameCodeAddress(), show_fullpaths, show_module, show_inline); 1088 } 1089 1090 void 1091 StackFrame::UpdateCurrentFrameFromPreviousFrame (StackFrame &prev_frame) 1092 { 1093 assert (GetStackID() == prev_frame.GetStackID()); // TODO: remove this after some testing 1094 m_variable_list_sp = prev_frame.m_variable_list_sp; 1095 m_variable_list_value_objects.Swap (prev_frame.m_variable_list_value_objects); 1096 if (!m_disassembly.GetString().empty()) 1097 m_disassembly.GetString().swap (m_disassembly.GetString()); 1098 } 1099 1100 1101 void 1102 StackFrame::UpdatePreviousFrameFromCurrentFrame (StackFrame &curr_frame) 1103 { 1104 assert (GetStackID() == curr_frame.GetStackID()); // TODO: remove this after some testing 1105 m_id.SetPC (curr_frame.m_id.GetPC()); // Update the Stack ID PC value 1106 assert (&m_thread == &curr_frame.m_thread); 1107 m_frame_index = curr_frame.m_frame_index; 1108 m_concrete_frame_index = curr_frame.m_concrete_frame_index; 1109 m_reg_context_sp = curr_frame.m_reg_context_sp; 1110 m_frame_code_addr = curr_frame.m_frame_code_addr; 1111 assert (m_sc.target_sp.get() == NULL || curr_frame.m_sc.target_sp.get() == NULL || m_sc.target_sp.get() == curr_frame.m_sc.target_sp.get()); 1112 assert (m_sc.module_sp.get() == NULL || curr_frame.m_sc.module_sp.get() == NULL || m_sc.module_sp.get() == curr_frame.m_sc.module_sp.get()); 1113 assert (m_sc.comp_unit == NULL || curr_frame.m_sc.comp_unit == NULL || m_sc.comp_unit == curr_frame.m_sc.comp_unit); 1114 assert (m_sc.function == NULL || curr_frame.m_sc.function == NULL || m_sc.function == curr_frame.m_sc.function); 1115 m_sc = curr_frame.m_sc; 1116 m_flags.Clear(GOT_FRAME_BASE | eSymbolContextEverything); 1117 m_flags.Set (m_sc.GetResolvedMask()); 1118 m_frame_base.Clear(); 1119 m_frame_base_error.Clear(); 1120 } 1121 1122 1123 bool 1124 StackFrame::HasCachedData () const 1125 { 1126 if (m_variable_list_sp.get()) 1127 return true; 1128 if (m_variable_list_value_objects.GetSize() > 0) 1129 return true; 1130 if (!m_disassembly.GetString().empty()) 1131 return true; 1132 return false; 1133 } 1134 1135 lldb::StackFrameSP 1136 StackFrame::GetSP () 1137 { 1138 return m_thread.GetStackFrameSPForStackFramePtr (this); 1139 } 1140 1141 1142 1143 bool 1144 StackFrame::GetStatus (Stream& strm, 1145 bool show_frame_info, 1146 bool show_source, 1147 uint32_t source_lines_before, 1148 uint32_t source_lines_after) 1149 { 1150 if (show_frame_info) 1151 { 1152 strm.Indent(); 1153 DumpUsingSettingsFormat (&strm); 1154 } 1155 1156 if (show_source) 1157 { 1158 GetSymbolContext(eSymbolContextCompUnit | eSymbolContextLineEntry); 1159 1160 if (m_sc.comp_unit && m_sc.line_entry.IsValid()) 1161 { 1162 Target &target = GetThread().GetProcess().GetTarget(); 1163 target.GetDebugger().GetSourceManager().DisplaySourceLinesWithLineNumbers ( 1164 &target, 1165 m_sc.line_entry.file, 1166 m_sc.line_entry.line, 1167 3, 1168 3, 1169 "->", 1170 &strm); 1171 1172 } 1173 } 1174 return true; 1175 } 1176 1177