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 VariableListSP 489 StackFrame::GetInScopeVariableList (bool get_file_globals) 490 { 491 VariableListSP var_list_sp(new VariableList); 492 GetSymbolContext (eSymbolContextCompUnit | eSymbolContextBlock); 493 494 if (m_sc.block) 495 { 496 const bool can_create = true; 497 const bool get_parent_variables = true; 498 const bool stop_if_block_is_inlined_function = true; 499 m_sc.block->AppendVariables (can_create, 500 get_parent_variables, 501 stop_if_block_is_inlined_function, 502 var_list_sp.get()); 503 } 504 505 if (m_sc.comp_unit) 506 { 507 VariableListSP global_variable_list_sp (m_sc.comp_unit->GetVariableList(true)); 508 if (global_variable_list_sp) 509 var_list_sp->AddVariables (global_variable_list_sp.get()); 510 } 511 512 return var_list_sp; 513 } 514 515 516 ValueObjectSP 517 StackFrame::GetValueForVariableExpressionPath (const char *var_expr_cstr, 518 lldb::DynamicValueType use_dynamic, 519 uint32_t options, 520 lldb::VariableSP &var_sp, 521 Error &error) 522 { 523 524 if (var_expr_cstr && var_expr_cstr[0]) 525 { 526 const bool check_ptr_vs_member = (options & eExpressionPathOptionCheckPtrVsMember) != 0; 527 const bool no_fragile_ivar = (options & eExpressionPathOptionsNoFragileObjcIvar) != 0; 528 error.Clear(); 529 bool deref = false; 530 bool address_of = false; 531 ValueObjectSP valobj_sp; 532 const bool get_file_globals = true; 533 // When looking up a variable for an expression, we need only consider the 534 // variables that are in scope. 535 VariableListSP var_list_sp (GetInScopeVariableList (get_file_globals)); 536 VariableList *variable_list = var_list_sp.get(); 537 538 if (variable_list) 539 { 540 // If first character is a '*', then show pointer contents 541 const char *var_expr = var_expr_cstr; 542 if (var_expr[0] == '*') 543 { 544 deref = true; 545 var_expr++; // Skip the '*' 546 } 547 else if (var_expr[0] == '&') 548 { 549 address_of = true; 550 var_expr++; // Skip the '&' 551 } 552 553 std::string var_path (var_expr); 554 size_t separator_idx = var_path.find_first_of(".-[=+~|&^%#@!/?,<>{}"); 555 StreamString var_expr_path_strm; 556 557 ConstString name_const_string; 558 if (separator_idx == std::string::npos) 559 name_const_string.SetCString (var_path.c_str()); 560 else 561 name_const_string.SetCStringWithLength (var_path.c_str(), separator_idx); 562 563 var_sp = variable_list->FindVariable(name_const_string); 564 if (var_sp) 565 { 566 valobj_sp = GetValueObjectForFrameVariable (var_sp, use_dynamic); 567 if (!valobj_sp) 568 return valobj_sp; 569 570 var_path.erase (0, name_const_string.GetLength ()); 571 // We are dumping at least one child 572 while (separator_idx != std::string::npos) 573 { 574 // Calculate the next separator index ahead of time 575 ValueObjectSP child_valobj_sp; 576 const char separator_type = var_path[0]; 577 switch (separator_type) 578 { 579 580 case '-': 581 if (var_path.size() >= 2 && var_path[1] != '>') 582 return ValueObjectSP(); 583 584 if (no_fragile_ivar) 585 { 586 // Make sure we aren't trying to deref an objective 587 // C ivar if this is not allowed 588 const uint32_t pointer_type_flags = ClangASTContext::GetTypeInfo (valobj_sp->GetClangType(), NULL, NULL); 589 if ((pointer_type_flags & ClangASTContext::eTypeIsObjC) && 590 (pointer_type_flags & ClangASTContext::eTypeIsPointer)) 591 { 592 // This was an objective C object pointer and 593 // it was requested we skip any fragile ivars 594 // so return nothing here 595 return ValueObjectSP(); 596 } 597 } 598 var_path.erase (0, 1); // Remove the '-' 599 // Fall through 600 case '.': 601 { 602 const bool expr_is_ptr = var_path[0] == '>'; 603 604 var_path.erase (0, 1); // Remove the '.' or '>' 605 separator_idx = var_path.find_first_of(".-["); 606 ConstString child_name; 607 if (separator_idx == std::string::npos) 608 child_name.SetCString (var_path.c_str()); 609 else 610 child_name.SetCStringWithLength(var_path.c_str(), separator_idx); 611 612 if (check_ptr_vs_member) 613 { 614 // We either have a pointer type and need to verify 615 // valobj_sp is a pointer, or we have a member of a 616 // class/union/struct being accessed with the . syntax 617 // and need to verify we don't have a pointer. 618 const bool actual_is_ptr = valobj_sp->IsPointerType (); 619 620 if (actual_is_ptr != expr_is_ptr) 621 { 622 // Incorrect use of "." with a pointer, or "->" with 623 // a class/union/struct instance or reference. 624 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 625 if (actual_is_ptr) 626 error.SetErrorStringWithFormat ("\"%s\" is a pointer and . was used to attempt to access \"%s\". Did you mean \"%s->%s\"?", 627 var_expr_path_strm.GetString().c_str(), 628 child_name.GetCString(), 629 var_expr_path_strm.GetString().c_str(), 630 var_path.c_str()); 631 else 632 error.SetErrorStringWithFormat ("\"%s\" is not a pointer and -> was used to attempt to access \"%s\". Did you mean \"%s.%s\"?", 633 var_expr_path_strm.GetString().c_str(), 634 child_name.GetCString(), 635 var_expr_path_strm.GetString().c_str(), 636 var_path.c_str()); 637 return ValueObjectSP(); 638 } 639 } 640 child_valobj_sp = valobj_sp->GetChildMemberWithName (child_name, true); 641 if (!child_valobj_sp) 642 { 643 // No child member with name "child_name" 644 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 645 if (child_name) 646 { 647 error.SetErrorStringWithFormat ("\"%s\" is not a member of \"(%s) %s\"", 648 child_name.GetCString(), 649 valobj_sp->GetTypeName().AsCString("<invalid type>"), 650 var_expr_path_strm.GetString().c_str()); 651 } 652 else 653 { 654 error.SetErrorStringWithFormat ("incomplete expression path after \"%s\" in \"%s\"", 655 var_expr_path_strm.GetString().c_str(), 656 var_expr_cstr); 657 } 658 659 return ValueObjectSP(); 660 } 661 // Remove the child name from the path 662 var_path.erase(0, child_name.GetLength()); 663 if (use_dynamic != lldb::eNoDynamicValues) 664 { 665 ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic)); 666 if (dynamic_value_sp) 667 child_valobj_sp = dynamic_value_sp; 668 } 669 } 670 break; 671 672 case '[': 673 // Array member access, or treating pointer as an array 674 if (var_path.size() > 2) // Need at least two brackets and a number 675 { 676 char *end = NULL; 677 long child_index = ::strtol (&var_path[1], &end, 0); 678 if (end && *end == ']' 679 && *(end-1) != '[') // this code forces an error in the case of arr[]. as bitfield[] is not a good syntax we're good to go 680 { 681 if (ClangASTContext::IsPointerToScalarType(valobj_sp->GetClangType()) && deref) 682 { 683 // what we have is *ptr[low]. the most similar C++ syntax is to deref ptr 684 // and extract bit low out of it. reading array item low 685 // would be done by saying ptr[low], without a deref * sign 686 Error error; 687 ValueObjectSP temp(valobj_sp->Dereference(error)); 688 if (error.Fail()) 689 { 690 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 691 error.SetErrorStringWithFormat ("could not dereference \"(%s) %s\"", 692 valobj_sp->GetTypeName().AsCString("<invalid type>"), 693 var_expr_path_strm.GetString().c_str()); 694 return ValueObjectSP(); 695 } 696 valobj_sp = temp; 697 deref = false; 698 } 699 else if (ClangASTContext::IsArrayOfScalarType(valobj_sp->GetClangType()) && deref) 700 { 701 // what we have is *arr[low]. the most similar C++ syntax is to get arr[0] 702 // (an operation that is equivalent to deref-ing arr) 703 // and extract bit low out of it. reading array item low 704 // would be done by saying arr[low], without a deref * sign 705 Error error; 706 ValueObjectSP temp(valobj_sp->GetChildAtIndex (0, true)); 707 if (error.Fail()) 708 { 709 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 710 error.SetErrorStringWithFormat ("could not get item 0 for \"(%s) %s\"", 711 valobj_sp->GetTypeName().AsCString("<invalid type>"), 712 var_expr_path_strm.GetString().c_str()); 713 return ValueObjectSP(); 714 } 715 valobj_sp = temp; 716 deref = false; 717 } 718 719 if (valobj_sp->IsPointerType ()) 720 { 721 child_valobj_sp = valobj_sp->GetSyntheticArrayMemberFromPointer (child_index, true); 722 if (!child_valobj_sp) 723 { 724 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 725 error.SetErrorStringWithFormat ("failed to use pointer as array for index %i for \"(%s) %s\"", 726 child_index, 727 valobj_sp->GetTypeName().AsCString("<invalid type>"), 728 var_expr_path_strm.GetString().c_str()); 729 } 730 } 731 else if (ClangASTContext::IsArrayType (valobj_sp->GetClangType(), NULL, NULL)) 732 { 733 // Pass false to dynamic_value here so we can tell the difference between 734 // no dynamic value and no member of this type... 735 child_valobj_sp = valobj_sp->GetChildAtIndex (child_index, true); 736 if (!child_valobj_sp) 737 { 738 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 739 error.SetErrorStringWithFormat ("array index %i is not valid for \"(%s) %s\"", 740 child_index, 741 valobj_sp->GetTypeName().AsCString("<invalid type>"), 742 var_expr_path_strm.GetString().c_str()); 743 } 744 } 745 else if (ClangASTContext::IsScalarType(valobj_sp->GetClangType())) 746 { 747 // this is a bitfield asking to display just one bit 748 child_valobj_sp = valobj_sp->GetSyntheticBitFieldChild(child_index, child_index, true); 749 if (!child_valobj_sp) 750 { 751 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 752 error.SetErrorStringWithFormat ("bitfield range %i-%i is not valid for \"(%s) %s\"", 753 child_index, child_index, 754 valobj_sp->GetTypeName().AsCString("<invalid type>"), 755 var_expr_path_strm.GetString().c_str()); 756 } 757 } 758 else 759 { 760 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 761 error.SetErrorStringWithFormat ("\"(%s) %s\" is not an array type", 762 valobj_sp->GetTypeName().AsCString("<invalid type>"), 763 var_expr_path_strm.GetString().c_str()); 764 } 765 766 if (!child_valobj_sp) 767 { 768 // Invalid array index... 769 return ValueObjectSP(); 770 } 771 772 // Erase the array member specification '[%i]' where 773 // %i is the array index 774 var_path.erase(0, (end - var_path.c_str()) + 1); 775 separator_idx = var_path.find_first_of(".-["); 776 if (use_dynamic != lldb::eNoDynamicValues) 777 { 778 ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic)); 779 if (dynamic_value_sp) 780 child_valobj_sp = dynamic_value_sp; 781 } 782 // Break out early from the switch since we were 783 // able to find the child member 784 break; 785 } 786 else if (end && *end == '-') 787 { 788 // this is most probably a BitField, let's take a look 789 char *real_end = NULL; 790 long final_index = ::strtol (end+1, &real_end, 0); 791 if (real_end && *real_end == ']') 792 { 793 // if the format given is [high-low], swap range 794 if (child_index > final_index) 795 { 796 long temp = child_index; 797 child_index = final_index; 798 final_index = temp; 799 } 800 801 if (ClangASTContext::IsPointerToScalarType(valobj_sp->GetClangType()) && deref) 802 { 803 // what we have is *ptr[low-high]. the most similar C++ syntax is to deref ptr 804 // and extract bits low thru high out of it. reading array items low thru high 805 // would be done by saying ptr[low-high], without a deref * sign 806 Error error; 807 ValueObjectSP temp(valobj_sp->Dereference(error)); 808 if (error.Fail()) 809 { 810 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 811 error.SetErrorStringWithFormat ("could not dereference \"(%s) %s\"", 812 valobj_sp->GetTypeName().AsCString("<invalid type>"), 813 var_expr_path_strm.GetString().c_str()); 814 return ValueObjectSP(); 815 } 816 valobj_sp = temp; 817 deref = false; 818 } 819 else if (ClangASTContext::IsArrayOfScalarType(valobj_sp->GetClangType()) && deref) 820 { 821 // what we have is *arr[low-high]. the most similar C++ syntax is to get arr[0] 822 // (an operation that is equivalent to deref-ing arr) 823 // and extract bits low thru high out of it. reading array items low thru high 824 // would be done by saying arr[low-high], without a deref * sign 825 Error error; 826 ValueObjectSP temp(valobj_sp->GetChildAtIndex (0, true)); 827 if (error.Fail()) 828 { 829 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 830 error.SetErrorStringWithFormat ("could not get item 0 for \"(%s) %s\"", 831 valobj_sp->GetTypeName().AsCString("<invalid type>"), 832 var_expr_path_strm.GetString().c_str()); 833 return ValueObjectSP(); 834 } 835 valobj_sp = temp; 836 deref = false; 837 } 838 839 child_valobj_sp = valobj_sp->GetSyntheticBitFieldChild(child_index, final_index, true); 840 if (!child_valobj_sp) 841 { 842 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 843 error.SetErrorStringWithFormat ("bitfield range %i-%i is not valid for \"(%s) %s\"", 844 child_index, final_index, 845 valobj_sp->GetTypeName().AsCString("<invalid type>"), 846 var_expr_path_strm.GetString().c_str()); 847 } 848 } 849 850 if (!child_valobj_sp) 851 { 852 // Invalid bitfield range... 853 return ValueObjectSP(); 854 } 855 856 // Erase the bitfield member specification '[%i-%i]' where 857 // %i is the index 858 var_path.erase(0, (real_end - var_path.c_str()) + 1); 859 separator_idx = var_path.find_first_of(".-["); 860 if (use_dynamic != lldb::eNoDynamicValues) 861 { 862 ValueObjectSP dynamic_value_sp(child_valobj_sp->GetDynamicValue(use_dynamic)); 863 if (dynamic_value_sp) 864 child_valobj_sp = dynamic_value_sp; 865 } 866 // Break out early from the switch since we were 867 // able to find the child member 868 break; 869 870 } 871 } 872 else 873 { 874 error.SetErrorStringWithFormat("invalid square bracket encountered after \"%s\" in \"%s\"", 875 var_expr_path_strm.GetString().c_str(), 876 var_path.c_str()); 877 } 878 return ValueObjectSP(); 879 880 default: 881 // Failure... 882 { 883 valobj_sp->GetExpressionPath (var_expr_path_strm, false); 884 error.SetErrorStringWithFormat ("unexpected char '%c' encountered after \"%s\" in \"%s\"", 885 separator_type, 886 var_expr_path_strm.GetString().c_str(), 887 var_path.c_str()); 888 889 return ValueObjectSP(); 890 } 891 } 892 893 if (child_valobj_sp) 894 valobj_sp = child_valobj_sp; 895 896 if (var_path.empty()) 897 break; 898 899 } 900 if (valobj_sp) 901 { 902 if (deref) 903 { 904 ValueObjectSP deref_valobj_sp (valobj_sp->Dereference(error)); 905 valobj_sp = deref_valobj_sp; 906 } 907 else if (address_of) 908 { 909 ValueObjectSP address_of_valobj_sp (valobj_sp->AddressOf(error)); 910 valobj_sp = address_of_valobj_sp; 911 } 912 } 913 return valobj_sp; 914 } 915 else 916 { 917 error.SetErrorStringWithFormat("no variable named '%s' found in this frame", 918 name_const_string.GetCString()); 919 } 920 } 921 } 922 else 923 { 924 error.SetErrorStringWithFormat("invalid variable path '%s'", var_expr_cstr); 925 } 926 return ValueObjectSP(); 927 } 928 929 bool 930 StackFrame::GetFrameBaseValue (Scalar &frame_base, Error *error_ptr) 931 { 932 if (m_flags.IsClear(GOT_FRAME_BASE)) 933 { 934 if (m_sc.function) 935 { 936 m_frame_base.Clear(); 937 m_frame_base_error.Clear(); 938 939 m_flags.Set(GOT_FRAME_BASE); 940 ExecutionContext exe_ctx (&m_thread.GetProcess(), &m_thread, this); 941 Value expr_value; 942 addr_t loclist_base_addr = LLDB_INVALID_ADDRESS; 943 if (m_sc.function->GetFrameBaseExpression().IsLocationList()) 944 loclist_base_addr = m_sc.function->GetAddressRange().GetBaseAddress().GetLoadAddress (&m_thread.GetProcess().GetTarget()); 945 946 if (m_sc.function->GetFrameBaseExpression().Evaluate(&exe_ctx, NULL, NULL, NULL, NULL, loclist_base_addr, NULL, expr_value, &m_frame_base_error) == false) 947 { 948 // We should really have an error if evaluate returns, but in case 949 // we don't, lets set the error to something at least. 950 if (m_frame_base_error.Success()) 951 m_frame_base_error.SetErrorString("Evaluation of the frame base expression failed."); 952 } 953 else 954 { 955 m_frame_base = expr_value.ResolveValue(&exe_ctx, NULL); 956 } 957 } 958 else 959 { 960 m_frame_base_error.SetErrorString ("No function in symbol context."); 961 } 962 } 963 964 if (m_frame_base_error.Success()) 965 frame_base = m_frame_base; 966 967 if (error_ptr) 968 *error_ptr = m_frame_base_error; 969 return m_frame_base_error.Success(); 970 } 971 972 RegisterContextSP 973 StackFrame::GetRegisterContext () 974 { 975 if (!m_reg_context_sp) 976 m_reg_context_sp = m_thread.CreateRegisterContextForFrame (this); 977 return m_reg_context_sp; 978 } 979 980 bool 981 StackFrame::HasDebugInformation () 982 { 983 GetSymbolContext (eSymbolContextLineEntry); 984 return m_sc.line_entry.IsValid(); 985 } 986 987 988 ValueObjectSP 989 StackFrame::GetValueObjectForFrameVariable (const VariableSP &variable_sp, lldb::DynamicValueType use_dynamic) 990 { 991 ValueObjectSP valobj_sp; 992 VariableList *var_list = GetVariableList (true); 993 if (var_list) 994 { 995 // Make sure the variable is a frame variable 996 const uint32_t var_idx = var_list->FindIndexForVariable (variable_sp.get()); 997 const uint32_t num_variables = var_list->GetSize(); 998 if (var_idx < num_variables) 999 { 1000 valobj_sp = m_variable_list_value_objects.GetValueObjectAtIndex (var_idx); 1001 if (valobj_sp.get() == NULL) 1002 { 1003 if (m_variable_list_value_objects.GetSize() < num_variables) 1004 m_variable_list_value_objects.Resize(num_variables); 1005 valobj_sp = ValueObjectVariable::Create (this, variable_sp); 1006 m_variable_list_value_objects.SetValueObjectAtIndex (var_idx, valobj_sp); 1007 } 1008 } 1009 } 1010 if (use_dynamic != lldb::eNoDynamicValues && valobj_sp) 1011 { 1012 ValueObjectSP dynamic_sp = valobj_sp->GetDynamicValue (use_dynamic); 1013 if (dynamic_sp) 1014 return dynamic_sp; 1015 } 1016 return valobj_sp; 1017 } 1018 1019 ValueObjectSP 1020 StackFrame::TrackGlobalVariable (const VariableSP &variable_sp, lldb::DynamicValueType use_dynamic) 1021 { 1022 // Check to make sure we aren't already tracking this variable? 1023 ValueObjectSP valobj_sp (GetValueObjectForFrameVariable (variable_sp, use_dynamic)); 1024 if (!valobj_sp) 1025 { 1026 // We aren't already tracking this global 1027 VariableList *var_list = GetVariableList (true); 1028 // If this frame has no variables, create a new list 1029 if (var_list == NULL) 1030 m_variable_list_sp.reset (new VariableList()); 1031 1032 // Add the global/static variable to this frame 1033 m_variable_list_sp->AddVariable (variable_sp); 1034 1035 // Now make a value object for it so we can track its changes 1036 valobj_sp = GetValueObjectForFrameVariable (variable_sp, use_dynamic); 1037 } 1038 return valobj_sp; 1039 } 1040 1041 bool 1042 StackFrame::IsInlined () 1043 { 1044 if (m_sc.block == NULL) 1045 GetSymbolContext (eSymbolContextBlock); 1046 if (m_sc.block) 1047 return m_sc.block->GetContainingInlinedBlock() != NULL; 1048 return false; 1049 } 1050 1051 Target * 1052 StackFrame::CalculateTarget () 1053 { 1054 return m_thread.CalculateTarget(); 1055 } 1056 1057 Process * 1058 StackFrame::CalculateProcess () 1059 { 1060 return m_thread.CalculateProcess(); 1061 } 1062 1063 Thread * 1064 StackFrame::CalculateThread () 1065 { 1066 return &m_thread; 1067 } 1068 1069 StackFrame * 1070 StackFrame::CalculateStackFrame () 1071 { 1072 return this; 1073 } 1074 1075 1076 void 1077 StackFrame::CalculateExecutionContext (ExecutionContext &exe_ctx) 1078 { 1079 m_thread.CalculateExecutionContext (exe_ctx); 1080 exe_ctx.frame = this; 1081 } 1082 1083 void 1084 StackFrame::DumpUsingSettingsFormat (Stream *strm) 1085 { 1086 if (strm == NULL) 1087 return; 1088 1089 GetSymbolContext(eSymbolContextEverything); 1090 ExecutionContext exe_ctx; 1091 CalculateExecutionContext(exe_ctx); 1092 const char *end = NULL; 1093 StreamString s; 1094 const char *frame_format = m_thread.GetProcess().GetTarget().GetDebugger().GetFrameFormat(); 1095 if (frame_format && Debugger::FormatPrompt (frame_format, &m_sc, &exe_ctx, NULL, s, &end)) 1096 { 1097 strm->Write(s.GetData(), s.GetSize()); 1098 } 1099 else 1100 { 1101 Dump (strm, true, false); 1102 strm->EOL(); 1103 } 1104 } 1105 1106 void 1107 StackFrame::Dump (Stream *strm, bool show_frame_index, bool show_fullpaths) 1108 { 1109 if (strm == NULL) 1110 return; 1111 1112 if (show_frame_index) 1113 strm->Printf("frame #%u: ", m_frame_index); 1114 strm->Printf("0x%0*llx ", m_thread.GetProcess().GetTarget().GetArchitecture().GetAddressByteSize() * 2, GetFrameCodeAddress().GetLoadAddress(&m_thread.GetProcess().GetTarget())); 1115 GetSymbolContext(eSymbolContextEverything); 1116 const bool show_module = true; 1117 const bool show_inline = true; 1118 m_sc.DumpStopContext(strm, &m_thread.GetProcess(), GetFrameCodeAddress(), show_fullpaths, show_module, show_inline); 1119 } 1120 1121 void 1122 StackFrame::UpdateCurrentFrameFromPreviousFrame (StackFrame &prev_frame) 1123 { 1124 assert (GetStackID() == prev_frame.GetStackID()); // TODO: remove this after some testing 1125 m_variable_list_sp = prev_frame.m_variable_list_sp; 1126 m_variable_list_value_objects.Swap (prev_frame.m_variable_list_value_objects); 1127 if (!m_disassembly.GetString().empty()) 1128 m_disassembly.GetString().swap (m_disassembly.GetString()); 1129 } 1130 1131 1132 void 1133 StackFrame::UpdatePreviousFrameFromCurrentFrame (StackFrame &curr_frame) 1134 { 1135 assert (GetStackID() == curr_frame.GetStackID()); // TODO: remove this after some testing 1136 m_id.SetPC (curr_frame.m_id.GetPC()); // Update the Stack ID PC value 1137 assert (&m_thread == &curr_frame.m_thread); 1138 m_frame_index = curr_frame.m_frame_index; 1139 m_concrete_frame_index = curr_frame.m_concrete_frame_index; 1140 m_reg_context_sp = curr_frame.m_reg_context_sp; 1141 m_frame_code_addr = curr_frame.m_frame_code_addr; 1142 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()); 1143 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()); 1144 assert (m_sc.comp_unit == NULL || curr_frame.m_sc.comp_unit == NULL || m_sc.comp_unit == curr_frame.m_sc.comp_unit); 1145 assert (m_sc.function == NULL || curr_frame.m_sc.function == NULL || m_sc.function == curr_frame.m_sc.function); 1146 m_sc = curr_frame.m_sc; 1147 m_flags.Clear(GOT_FRAME_BASE | eSymbolContextEverything); 1148 m_flags.Set (m_sc.GetResolvedMask()); 1149 m_frame_base.Clear(); 1150 m_frame_base_error.Clear(); 1151 } 1152 1153 1154 bool 1155 StackFrame::HasCachedData () const 1156 { 1157 if (m_variable_list_sp.get()) 1158 return true; 1159 if (m_variable_list_value_objects.GetSize() > 0) 1160 return true; 1161 if (!m_disassembly.GetString().empty()) 1162 return true; 1163 return false; 1164 } 1165 1166 lldb::StackFrameSP 1167 StackFrame::GetSP () 1168 { 1169 return m_thread.GetStackFrameSPForStackFramePtr (this); 1170 } 1171 1172 1173 1174 bool 1175 StackFrame::GetStatus (Stream& strm, 1176 bool show_frame_info, 1177 bool show_source, 1178 uint32_t source_lines_before, 1179 uint32_t source_lines_after) 1180 { 1181 if (show_frame_info) 1182 { 1183 strm.Indent(); 1184 DumpUsingSettingsFormat (&strm); 1185 } 1186 1187 if (show_source) 1188 { 1189 GetSymbolContext(eSymbolContextCompUnit | eSymbolContextLineEntry); 1190 1191 if (m_sc.comp_unit && m_sc.line_entry.IsValid()) 1192 { 1193 Target &target = GetThread().GetProcess().GetTarget(); 1194 target.GetDebugger().GetSourceManager().DisplaySourceLinesWithLineNumbers ( 1195 &target, 1196 m_sc.line_entry.file, 1197 m_sc.line_entry.line, 1198 3, 1199 3, 1200 "->", 1201 &strm); 1202 1203 } 1204 } 1205 return true; 1206 } 1207 1208