1 //===-- DWARFASTParserClang.cpp ---------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <stdlib.h> 10 11 #include "DWARFASTParserClang.h" 12 #include "DWARFDebugInfo.h" 13 #include "DWARFDeclContext.h" 14 #include "DWARFDefines.h" 15 #include "SymbolFileDWARF.h" 16 #include "SymbolFileDWARFDwo.h" 17 #include "SymbolFileDWARFDebugMap.h" 18 #include "UniqueDWARFASTType.h" 19 20 #include "Plugins/Language/ObjC/ObjCLanguage.h" 21 #include "lldb/Core/Module.h" 22 #include "lldb/Core/Value.h" 23 #include "lldb/Host/Host.h" 24 #include "lldb/Symbol/ClangASTImporter.h" 25 #include "lldb/Symbol/ClangASTMetadata.h" 26 #include "lldb/Symbol/ClangUtil.h" 27 #include "lldb/Symbol/CompileUnit.h" 28 #include "lldb/Symbol/Function.h" 29 #include "lldb/Symbol/ObjectFile.h" 30 #include "lldb/Symbol/SymbolFile.h" 31 #include "lldb/Symbol/TypeList.h" 32 #include "lldb/Symbol/TypeMap.h" 33 #include "lldb/Target/Language.h" 34 #include "lldb/Utility/LLDBAssert.h" 35 #include "lldb/Utility/Log.h" 36 #include "lldb/Utility/StreamString.h" 37 38 #include "clang/AST/CXXInheritance.h" 39 #include "clang/AST/DeclCXX.h" 40 #include "clang/AST/DeclObjC.h" 41 #include "clang/AST/DeclTemplate.h" 42 43 #include <map> 44 #include <memory> 45 #include <vector> 46 47 //#define ENABLE_DEBUG_PRINTF // COMMENT OUT THIS LINE PRIOR TO CHECKIN 48 49 #ifdef ENABLE_DEBUG_PRINTF 50 #include <stdio.h> 51 #define DEBUG_PRINTF(fmt, ...) printf(fmt, __VA_ARGS__) 52 #else 53 #define DEBUG_PRINTF(fmt, ...) 54 #endif 55 56 using namespace lldb; 57 using namespace lldb_private; 58 DWARFASTParserClang::DWARFASTParserClang(ClangASTContext &ast) 59 : m_ast(ast), m_die_to_decl_ctx(), m_decl_ctx_to_die() {} 60 61 DWARFASTParserClang::~DWARFASTParserClang() {} 62 63 static AccessType DW_ACCESS_to_AccessType(uint32_t dwarf_accessibility) { 64 switch (dwarf_accessibility) { 65 case DW_ACCESS_public: 66 return eAccessPublic; 67 case DW_ACCESS_private: 68 return eAccessPrivate; 69 case DW_ACCESS_protected: 70 return eAccessProtected; 71 default: 72 break; 73 } 74 return eAccessNone; 75 } 76 77 static bool DeclKindIsCXXClass(clang::Decl::Kind decl_kind) { 78 switch (decl_kind) { 79 case clang::Decl::CXXRecord: 80 case clang::Decl::ClassTemplateSpecialization: 81 return true; 82 default: 83 break; 84 } 85 return false; 86 } 87 88 89 ClangASTImporter &DWARFASTParserClang::GetClangASTImporter() { 90 if (!m_clang_ast_importer_up) { 91 m_clang_ast_importer_up.reset(new ClangASTImporter); 92 } 93 return *m_clang_ast_importer_up; 94 } 95 96 /// Detect a forward declaration that is nested in a DW_TAG_module. 97 static bool IsClangModuleFwdDecl(const DWARFDIE &Die) { 98 if (!Die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0)) 99 return false; 100 auto Parent = Die.GetParent(); 101 while (Parent.IsValid()) { 102 if (Parent.Tag() == DW_TAG_module) 103 return true; 104 Parent = Parent.GetParent(); 105 } 106 return false; 107 } 108 109 static DWARFDIE GetContainingClangModuleDIE(const DWARFDIE &die) { 110 if (die.IsValid()) { 111 DWARFDIE top_module_die; 112 // Now make sure this DIE is scoped in a DW_TAG_module tag and return true 113 // if so 114 for (DWARFDIE parent = die.GetParent(); parent.IsValid(); 115 parent = parent.GetParent()) { 116 const dw_tag_t tag = parent.Tag(); 117 if (tag == DW_TAG_module) 118 top_module_die = parent; 119 else if (tag == DW_TAG_compile_unit || tag == DW_TAG_partial_unit) 120 break; 121 } 122 123 return top_module_die; 124 } 125 return DWARFDIE(); 126 } 127 128 static lldb::ModuleSP GetContainingClangModule(const DWARFDIE &die) { 129 if (die.IsValid()) { 130 DWARFDIE clang_module_die = GetContainingClangModuleDIE(die); 131 132 if (clang_module_die) { 133 const char *module_name = clang_module_die.GetName(); 134 if (module_name) 135 return die.GetDWARF()->GetExternalModule( 136 lldb_private::ConstString(module_name)); 137 } 138 } 139 return lldb::ModuleSP(); 140 } 141 142 TypeSP DWARFASTParserClang::ParseTypeFromClangModule(const SymbolContext &sc, 143 const DWARFDIE &die, 144 Log *log) { 145 ModuleSP clang_module_sp = GetContainingClangModule(die); 146 if (!clang_module_sp) 147 return TypeSP(); 148 149 // If this type comes from a Clang module, recursively look in the 150 // DWARF section of the .pcm file in the module cache. Clang 151 // generates DWO skeleton units as breadcrumbs to find them. 152 llvm::SmallVector<CompilerContext, 4> decl_context; 153 die.GetDeclContext(decl_context); 154 TypeMap pcm_types; 155 156 // The type in the Clang module must have the same language as the current CU. 157 LanguageSet languages; 158 languages.Insert(die.GetCU()->GetLanguageType()); 159 llvm::DenseSet<SymbolFile *> searched_symbol_files; 160 clang_module_sp->GetSymbolFile()->FindTypes(decl_context, languages, 161 searched_symbol_files, pcm_types); 162 if (pcm_types.Empty()) { 163 // Since this type is defined in one of the Clang modules imported 164 // by this symbol file, search all of them. Instead of calling 165 // sym_file->FindTypes(), which would return this again, go straight 166 // to the imported modules. 167 auto &sym_file = die.GetCU()->GetSymbolFileDWARF(); 168 169 // Well-formed clang modules never form cycles; guard against corrupted 170 // ones by inserting the current file. 171 searched_symbol_files.insert(&sym_file); 172 sym_file.ForEachExternalModule( 173 *sc.comp_unit, searched_symbol_files, [&](Module &module) { 174 module.GetSymbolFile()->FindTypes(decl_context, languages, 175 searched_symbol_files, pcm_types); 176 return pcm_types.GetSize(); 177 }); 178 } 179 180 if (!pcm_types.GetSize()) 181 return TypeSP(); 182 183 // We found a real definition for this type in the Clang module, so lets use 184 // it and cache the fact that we found a complete type for this die. 185 TypeSP pcm_type_sp = pcm_types.GetTypeAtIndex(0); 186 if (!pcm_type_sp) 187 return TypeSP(); 188 189 lldb_private::CompilerType pcm_type = pcm_type_sp->GetForwardCompilerType(); 190 lldb_private::CompilerType type = 191 GetClangASTImporter().CopyType(m_ast, pcm_type); 192 193 if (!type) 194 return TypeSP(); 195 196 // Under normal operation pcm_type is a shallow forward declaration 197 // that gets completed later. This is necessary to support cyclic 198 // data structures. If, however, pcm_type is already complete (for 199 // example, because it was loaded for a different target before), 200 // the definition needs to be imported right away, too. 201 // Type::ResolveClangType() effectively ignores the ResolveState 202 // inside type_sp and only looks at IsDefined(), so it never calls 203 // ClangASTImporter::ASTImporterDelegate::ImportDefinitionTo(), 204 // which does extra work for Objective-C classes. This would result 205 // in only the forward declaration to be visible. 206 if (pcm_type.IsDefined()) 207 GetClangASTImporter().RequireCompleteType(ClangUtil::GetQualType(type)); 208 209 SymbolFileDWARF *dwarf = die.GetDWARF(); 210 TypeSP type_sp(new Type( 211 die.GetID(), dwarf, pcm_type_sp->GetName(), pcm_type_sp->GetByteSize(), 212 nullptr, LLDB_INVALID_UID, Type::eEncodingInvalid, 213 &pcm_type_sp->GetDeclaration(), type, Type::ResolveState::Forward)); 214 215 dwarf->GetTypeList().Insert(type_sp); 216 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 217 clang::TagDecl *tag_decl = ClangASTContext::GetAsTagDecl(type); 218 if (tag_decl) 219 LinkDeclContextToDIE(tag_decl, die); 220 else { 221 clang::DeclContext *defn_decl_ctx = GetCachedClangDeclContextForDIE(die); 222 if (defn_decl_ctx) 223 LinkDeclContextToDIE(defn_decl_ctx, die); 224 } 225 226 return type_sp; 227 } 228 229 static void CompleteExternalTagDeclType(ClangASTContext &ast, 230 ClangASTImporter &ast_importer, 231 clang::DeclContext *decl_ctx, 232 DWARFDIE die, 233 const char *type_name_cstr) { 234 auto *tag_decl_ctx = clang::dyn_cast<clang::TagDecl>(decl_ctx); 235 if (!tag_decl_ctx) 236 return; 237 238 // If this type was not imported from an external AST, there's nothing to do. 239 CompilerType type = ast.GetTypeForDecl(tag_decl_ctx); 240 if (!type || !ast_importer.CanImport(type)) 241 return; 242 243 auto qual_type = ClangUtil::GetQualType(type); 244 if (!ast_importer.RequireCompleteType(qual_type)) { 245 die.GetDWARF()->GetObjectFile()->GetModule()->ReportError( 246 "Unable to complete the Decl context for DIE '%s' at offset " 247 "0x%8.8x.\nPlease file a bug report.", 248 type_name_cstr ? type_name_cstr : "", die.GetOffset()); 249 // We need to make the type look complete otherwise, we might crash in 250 // Clang when adding children. 251 if (ClangASTContext::StartTagDeclarationDefinition(type)) 252 ClangASTContext::CompleteTagDeclarationDefinition(type); 253 } 254 } 255 256 ParsedDWARFTypeAttributes::ParsedDWARFTypeAttributes(const DWARFDIE &die) { 257 DWARFAttributes attributes; 258 size_t num_attributes = die.GetAttributes(attributes); 259 for (size_t i = 0; i < num_attributes; ++i) { 260 dw_attr_t attr = attributes.AttributeAtIndex(i); 261 DWARFFormValue form_value; 262 if (!attributes.ExtractFormValueAtIndex(i, form_value)) 263 continue; 264 switch (attr) { 265 case DW_AT_abstract_origin: 266 abstract_origin = form_value; 267 break; 268 269 case DW_AT_accessibility: 270 accessibility = DW_ACCESS_to_AccessType(form_value.Unsigned()); 271 break; 272 273 case DW_AT_artificial: 274 is_artificial = form_value.Boolean(); 275 break; 276 277 case DW_AT_bit_stride: 278 bit_stride = form_value.Unsigned(); 279 break; 280 281 case DW_AT_byte_size: 282 byte_size = form_value.Unsigned(); 283 break; 284 285 case DW_AT_byte_stride: 286 byte_stride = form_value.Unsigned(); 287 break; 288 289 case DW_AT_calling_convention: 290 calling_convention = form_value.Unsigned(); 291 break; 292 293 case DW_AT_containing_type: 294 containing_type = form_value; 295 break; 296 297 case DW_AT_decl_file: 298 decl.SetFile(die.GetCU()->GetFile(form_value.Unsigned())); 299 break; 300 case DW_AT_decl_line: 301 decl.SetLine(form_value.Unsigned()); 302 break; 303 case DW_AT_decl_column: 304 decl.SetColumn(form_value.Unsigned()); 305 break; 306 307 case DW_AT_declaration: 308 is_forward_declaration = form_value.Boolean(); 309 break; 310 311 case DW_AT_encoding: 312 encoding = form_value.Unsigned(); 313 break; 314 315 case DW_AT_enum_class: 316 is_scoped_enum = form_value.Boolean(); 317 break; 318 319 case DW_AT_explicit: 320 is_explicit = form_value.Boolean(); 321 break; 322 323 case DW_AT_external: 324 if (form_value.Unsigned()) 325 storage = clang::SC_Extern; 326 break; 327 328 case DW_AT_inline: 329 is_inline = form_value.Boolean(); 330 break; 331 332 case DW_AT_linkage_name: 333 case DW_AT_MIPS_linkage_name: 334 mangled_name = form_value.AsCString(); 335 break; 336 337 case DW_AT_name: 338 name.SetCString(form_value.AsCString()); 339 break; 340 341 case DW_AT_object_pointer: 342 object_pointer = form_value.Reference(); 343 break; 344 345 case DW_AT_signature: 346 signature = form_value; 347 break; 348 349 case DW_AT_specification: 350 specification = form_value; 351 break; 352 353 case DW_AT_type: 354 type = form_value; 355 break; 356 357 case DW_AT_virtuality: 358 is_virtual = form_value.Boolean(); 359 break; 360 361 case DW_AT_APPLE_objc_complete_type: 362 is_complete_objc_class = form_value.Signed(); 363 break; 364 365 case DW_AT_APPLE_objc_direct: 366 is_objc_direct_call = true; 367 break; 368 369 case DW_AT_APPLE_runtime_class: 370 class_language = (LanguageType)form_value.Signed(); 371 break; 372 373 case DW_AT_GNU_vector: 374 is_vector = form_value.Boolean(); 375 break; 376 case DW_AT_export_symbols: 377 exports_symbols = form_value.Boolean(); 378 break; 379 } 380 } 381 } 382 383 static std::string GetUnitName(const DWARFDIE &die) { 384 if (DWARFUnit *unit = die.GetCU()) 385 return unit->GetAbsolutePath().GetPath(); 386 return "<missing DWARF unit path>"; 387 } 388 389 TypeSP DWARFASTParserClang::ParseTypeFromDWARF(const SymbolContext &sc, 390 const DWARFDIE &die, 391 bool *type_is_new_ptr) { 392 if (type_is_new_ptr) 393 *type_is_new_ptr = false; 394 395 if (!die) 396 return nullptr; 397 398 Log *log(LogChannelDWARF::GetLogIfAny(DWARF_LOG_TYPE_COMPLETION | 399 DWARF_LOG_LOOKUPS)); 400 401 SymbolFileDWARF *dwarf = die.GetDWARF(); 402 if (log) { 403 DWARFDIE context_die; 404 clang::DeclContext *context = 405 GetClangDeclContextContainingDIE(die, &context_die); 406 407 dwarf->GetObjectFile()->GetModule()->LogMessage( 408 log, 409 "DWARFASTParserClang::ParseTypeFromDWARF " 410 "(die = 0x%8.8x, decl_ctx = %p (die 0x%8.8x)) %s name = '%s')", 411 die.GetOffset(), static_cast<void *>(context), context_die.GetOffset(), 412 die.GetTagAsCString(), die.GetName()); 413 } 414 415 Type *type_ptr = dwarf->GetDIEToType().lookup(die.GetDIE()); 416 if (type_ptr == DIE_IS_BEING_PARSED) 417 return nullptr; 418 if (type_ptr) 419 return type_ptr->shared_from_this(); 420 // Set a bit that lets us know that we are currently parsing this 421 dwarf->GetDIEToType()[die.GetDIE()] = DIE_IS_BEING_PARSED; 422 423 ParsedDWARFTypeAttributes attrs(die); 424 425 if (DWARFDIE signature_die = attrs.signature.Reference()) { 426 if (TypeSP type_sp = 427 ParseTypeFromDWARF(sc, signature_die, type_is_new_ptr)) { 428 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 429 if (clang::DeclContext *decl_ctx = 430 GetCachedClangDeclContextForDIE(signature_die)) 431 LinkDeclContextToDIE(decl_ctx, die); 432 return type_sp; 433 } 434 return nullptr; 435 } 436 437 if (type_is_new_ptr) 438 *type_is_new_ptr = true; 439 440 const dw_tag_t tag = die.Tag(); 441 442 TypeSP type_sp; 443 444 switch (tag) { 445 case DW_TAG_typedef: 446 case DW_TAG_base_type: 447 case DW_TAG_pointer_type: 448 case DW_TAG_reference_type: 449 case DW_TAG_rvalue_reference_type: 450 case DW_TAG_const_type: 451 case DW_TAG_restrict_type: 452 case DW_TAG_volatile_type: 453 case DW_TAG_atomic_type: 454 case DW_TAG_unspecified_type: { 455 type_sp = ParseTypeModifier(sc, die, attrs); 456 break; 457 } 458 459 case DW_TAG_structure_type: 460 case DW_TAG_union_type: 461 case DW_TAG_class_type: { 462 type_sp = ParseStructureLikeDIE(sc, die, attrs); 463 break; 464 } 465 466 case DW_TAG_enumeration_type: { 467 type_sp = ParseEnum(sc, die, attrs); 468 break; 469 } 470 471 case DW_TAG_inlined_subroutine: 472 case DW_TAG_subprogram: 473 case DW_TAG_subroutine_type: { 474 type_sp = ParseSubroutine(die, attrs); 475 break; 476 } 477 case DW_TAG_array_type: { 478 type_sp = ParseArrayType(die, attrs); 479 break; 480 } 481 case DW_TAG_ptr_to_member_type: { 482 type_sp = ParsePointerToMemberType(die, attrs); 483 break; 484 } 485 default: 486 dwarf->GetObjectFile()->GetModule()->ReportError( 487 "{0x%8.8x}: unhandled type tag 0x%4.4x (%s), please file a bug and " 488 "attach the file at the start of this error message", 489 die.GetOffset(), tag, DW_TAG_value_to_name(tag)); 490 break; 491 } 492 493 // TODO: We should consider making the switch above exhaustive to simplify 494 // control flow in ParseTypeFromDWARF. Then, we could simply replace this 495 // return statement with a call to llvm_unreachable. 496 return UpdateSymbolContextScopeForType(sc, die, type_sp); 497 } 498 499 lldb::TypeSP 500 DWARFASTParserClang::ParseTypeModifier(const SymbolContext &sc, 501 const DWARFDIE &die, 502 ParsedDWARFTypeAttributes &attrs) { 503 Log *log(LogChannelDWARF::GetLogIfAny(DWARF_LOG_TYPE_COMPLETION | 504 DWARF_LOG_LOOKUPS)); 505 SymbolFileDWARF *dwarf = die.GetDWARF(); 506 const dw_tag_t tag = die.Tag(); 507 LanguageType cu_language = die.GetLanguage(); 508 Type::ResolveState resolve_state = Type::ResolveState::Unresolved; 509 Type::EncodingDataType encoding_data_type = Type::eEncodingIsUID; 510 TypeSP type_sp; 511 CompilerType clang_type; 512 513 if (tag == DW_TAG_typedef && attrs.type.IsValid()) { 514 // Try to parse a typedef from the (DWARF embedded in the) Clang 515 // module file first as modules can contain typedef'ed 516 // structures that have no names like: 517 // 518 // typedef struct { int a; } Foo; 519 // 520 // In this case we will have a structure with no name and a 521 // typedef named "Foo" that points to this unnamed 522 // structure. The name in the typedef is the only identifier for 523 // the struct, so always try to get typedefs from Clang modules 524 // if possible. 525 // 526 // The type_sp returned will be empty if the typedef doesn't 527 // exist in a module file, so it is cheap to call this function 528 // just to check. 529 // 530 // If we don't do this we end up creating a TypeSP that says 531 // this is a typedef to type 0x123 (the DW_AT_type value would 532 // be 0x123 in the DW_TAG_typedef), and this is the unnamed 533 // structure type. We will have a hard time tracking down an 534 // unnammed structure type in the module debug info, so we make 535 // sure we don't get into this situation by always resolving 536 // typedefs from the module. 537 const DWARFDIE encoding_die = attrs.type.Reference(); 538 539 // First make sure that the die that this is typedef'ed to _is_ 540 // just a declaration (DW_AT_declaration == 1), not a full 541 // definition since template types can't be represented in 542 // modules since only concrete instances of templates are ever 543 // emitted and modules won't contain those 544 if (encoding_die && 545 encoding_die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0) == 1) { 546 type_sp = ParseTypeFromClangModule(sc, die, log); 547 if (type_sp) 548 return type_sp; 549 } 550 } 551 552 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\") type => 0x%8.8lx\n", die.GetID(), 553 DW_TAG_value_to_name(tag), type_name_cstr, 554 encoding_uid.Reference()); 555 556 switch (tag) { 557 default: 558 break; 559 560 case DW_TAG_unspecified_type: 561 if (attrs.name == "nullptr_t" || attrs.name == "decltype(nullptr)") { 562 resolve_state = Type::ResolveState::Full; 563 clang_type = m_ast.GetBasicType(eBasicTypeNullPtr); 564 break; 565 } 566 // Fall through to base type below in case we can handle the type 567 // there... 568 LLVM_FALLTHROUGH; 569 570 case DW_TAG_base_type: 571 resolve_state = Type::ResolveState::Full; 572 clang_type = m_ast.GetBuiltinTypeForDWARFEncodingAndBitSize( 573 attrs.name.GetStringRef(), attrs.encoding, 574 attrs.byte_size.getValueOr(0) * 8); 575 break; 576 577 case DW_TAG_pointer_type: 578 encoding_data_type = Type::eEncodingIsPointerUID; 579 break; 580 case DW_TAG_reference_type: 581 encoding_data_type = Type::eEncodingIsLValueReferenceUID; 582 break; 583 case DW_TAG_rvalue_reference_type: 584 encoding_data_type = Type::eEncodingIsRValueReferenceUID; 585 break; 586 case DW_TAG_typedef: 587 encoding_data_type = Type::eEncodingIsTypedefUID; 588 break; 589 case DW_TAG_const_type: 590 encoding_data_type = Type::eEncodingIsConstUID; 591 break; 592 case DW_TAG_restrict_type: 593 encoding_data_type = Type::eEncodingIsRestrictUID; 594 break; 595 case DW_TAG_volatile_type: 596 encoding_data_type = Type::eEncodingIsVolatileUID; 597 break; 598 case DW_TAG_atomic_type: 599 encoding_data_type = Type::eEncodingIsAtomicUID; 600 break; 601 } 602 603 if (!clang_type && (encoding_data_type == Type::eEncodingIsPointerUID || 604 encoding_data_type == Type::eEncodingIsTypedefUID)) { 605 if (tag == DW_TAG_pointer_type) { 606 DWARFDIE target_die = die.GetReferencedDIE(DW_AT_type); 607 608 if (target_die.GetAttributeValueAsUnsigned(DW_AT_APPLE_block, 0)) { 609 // Blocks have a __FuncPtr inside them which is a pointer to a 610 // function of the proper type. 611 612 for (DWARFDIE child_die = target_die.GetFirstChild(); 613 child_die.IsValid(); child_die = child_die.GetSibling()) { 614 if (!strcmp(child_die.GetAttributeValueAsString(DW_AT_name, ""), 615 "__FuncPtr")) { 616 DWARFDIE function_pointer_type = 617 child_die.GetReferencedDIE(DW_AT_type); 618 619 if (function_pointer_type) { 620 DWARFDIE function_type = 621 function_pointer_type.GetReferencedDIE(DW_AT_type); 622 623 bool function_type_is_new_pointer; 624 TypeSP lldb_function_type_sp = ParseTypeFromDWARF( 625 sc, function_type, &function_type_is_new_pointer); 626 627 if (lldb_function_type_sp) { 628 clang_type = m_ast.CreateBlockPointerType( 629 lldb_function_type_sp->GetForwardCompilerType()); 630 encoding_data_type = Type::eEncodingIsUID; 631 attrs.type.Clear(); 632 resolve_state = Type::ResolveState::Full; 633 } 634 } 635 636 break; 637 } 638 } 639 } 640 } 641 642 if (cu_language == eLanguageTypeObjC || 643 cu_language == eLanguageTypeObjC_plus_plus) { 644 if (attrs.name) { 645 if (attrs.name == "id") { 646 if (log) 647 dwarf->GetObjectFile()->GetModule()->LogMessage( 648 log, 649 "SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' " 650 "is Objective-C 'id' built-in type.", 651 die.GetOffset(), die.GetTagAsCString(), die.GetName()); 652 clang_type = m_ast.GetBasicType(eBasicTypeObjCID); 653 encoding_data_type = Type::eEncodingIsUID; 654 attrs.type.Clear(); 655 resolve_state = Type::ResolveState::Full; 656 } else if (attrs.name == "Class") { 657 if (log) 658 dwarf->GetObjectFile()->GetModule()->LogMessage( 659 log, 660 "SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' " 661 "is Objective-C 'Class' built-in type.", 662 die.GetOffset(), die.GetTagAsCString(), die.GetName()); 663 clang_type = m_ast.GetBasicType(eBasicTypeObjCClass); 664 encoding_data_type = Type::eEncodingIsUID; 665 attrs.type.Clear(); 666 resolve_state = Type::ResolveState::Full; 667 } else if (attrs.name == "SEL") { 668 if (log) 669 dwarf->GetObjectFile()->GetModule()->LogMessage( 670 log, 671 "SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' " 672 "is Objective-C 'selector' built-in type.", 673 die.GetOffset(), die.GetTagAsCString(), die.GetName()); 674 clang_type = m_ast.GetBasicType(eBasicTypeObjCSel); 675 encoding_data_type = Type::eEncodingIsUID; 676 attrs.type.Clear(); 677 resolve_state = Type::ResolveState::Full; 678 } 679 } else if (encoding_data_type == Type::eEncodingIsPointerUID && 680 attrs.type.IsValid()) { 681 // Clang sometimes erroneously emits id as objc_object*. In that 682 // case we fix up the type to "id". 683 684 const DWARFDIE encoding_die = attrs.type.Reference(); 685 686 if (encoding_die && encoding_die.Tag() == DW_TAG_structure_type) { 687 llvm::StringRef struct_name = encoding_die.GetName(); 688 if (struct_name == "objc_object") { 689 if (log) 690 dwarf->GetObjectFile()->GetModule()->LogMessage( 691 log, 692 "SymbolFileDWARF::ParseType (die = 0x%8.8x) %s " 693 "'%s' is 'objc_object*', which we overrode to " 694 "'id'.", 695 die.GetOffset(), die.GetTagAsCString(), die.GetName()); 696 clang_type = m_ast.GetBasicType(eBasicTypeObjCID); 697 encoding_data_type = Type::eEncodingIsUID; 698 attrs.type.Clear(); 699 resolve_state = Type::ResolveState::Full; 700 } 701 } 702 } 703 } 704 } 705 706 type_sp = std::make_shared<Type>( 707 die.GetID(), dwarf, attrs.name, attrs.byte_size, nullptr, 708 dwarf->GetUID(attrs.type.Reference()), encoding_data_type, &attrs.decl, 709 clang_type, resolve_state); 710 711 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 712 return type_sp; 713 } 714 715 TypeSP DWARFASTParserClang::ParseEnum(const SymbolContext &sc, 716 const DWARFDIE &die, 717 ParsedDWARFTypeAttributes &attrs) { 718 Log *log(LogChannelDWARF::GetLogIfAny(DWARF_LOG_TYPE_COMPLETION | 719 DWARF_LOG_LOOKUPS)); 720 SymbolFileDWARF *dwarf = die.GetDWARF(); 721 const dw_tag_t tag = die.Tag(); 722 TypeSP type_sp; 723 724 if (attrs.is_forward_declaration) { 725 type_sp = ParseTypeFromClangModule(sc, die, log); 726 if (type_sp) 727 return type_sp; 728 729 DWARFDeclContext die_decl_ctx; 730 die.GetDWARFDeclContext(die_decl_ctx); 731 732 type_sp = dwarf->FindDefinitionTypeForDWARFDeclContext(die_decl_ctx); 733 734 if (!type_sp) { 735 SymbolFileDWARFDebugMap *debug_map_symfile = dwarf->GetDebugMapSymfile(); 736 if (debug_map_symfile) { 737 // We weren't able to find a full declaration in this DWARF, 738 // see if we have a declaration anywhere else... 739 type_sp = debug_map_symfile->FindDefinitionTypeForDWARFDeclContext( 740 die_decl_ctx); 741 } 742 } 743 744 if (type_sp) { 745 if (log) { 746 dwarf->GetObjectFile()->GetModule()->LogMessage( 747 log, 748 "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is a " 749 "forward declaration, complete type is 0x%8.8" PRIx64, 750 static_cast<void *>(this), die.GetOffset(), 751 DW_TAG_value_to_name(tag), attrs.name.GetCString(), 752 type_sp->GetID()); 753 } 754 755 // We found a real definition for this type elsewhere so lets use 756 // it and cache the fact that we found a complete type for this 757 // die 758 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 759 clang::DeclContext *defn_decl_ctx = 760 GetCachedClangDeclContextForDIE(dwarf->GetDIE(type_sp->GetID())); 761 if (defn_decl_ctx) 762 LinkDeclContextToDIE(defn_decl_ctx, die); 763 return type_sp; 764 } 765 } 766 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(), 767 DW_TAG_value_to_name(tag), type_name_cstr); 768 769 CompilerType enumerator_clang_type; 770 CompilerType clang_type; 771 clang_type.SetCompilerType( 772 &m_ast, dwarf->GetForwardDeclDieToClangType().lookup(die.GetDIE())); 773 if (!clang_type) { 774 if (attrs.type.IsValid()) { 775 Type *enumerator_type = 776 dwarf->ResolveTypeUID(attrs.type.Reference(), true); 777 if (enumerator_type) 778 enumerator_clang_type = enumerator_type->GetFullCompilerType(); 779 } 780 781 if (!enumerator_clang_type) { 782 if (attrs.byte_size) { 783 enumerator_clang_type = m_ast.GetBuiltinTypeForDWARFEncodingAndBitSize( 784 "", DW_ATE_signed, *attrs.byte_size * 8); 785 } else { 786 enumerator_clang_type = m_ast.GetBasicType(eBasicTypeInt); 787 } 788 } 789 790 clang_type = m_ast.CreateEnumerationType( 791 attrs.name.GetCString(), GetClangDeclContextContainingDIE(die, nullptr), 792 attrs.decl, enumerator_clang_type, attrs.is_scoped_enum); 793 } else { 794 enumerator_clang_type = 795 m_ast.GetEnumerationIntegerType(clang_type.GetOpaqueQualType()); 796 } 797 798 LinkDeclContextToDIE(ClangASTContext::GetDeclContextForType(clang_type), die); 799 800 type_sp = std::make_shared<Type>( 801 die.GetID(), dwarf, attrs.name, attrs.byte_size, nullptr, 802 dwarf->GetUID(attrs.type.Reference()), Type::eEncodingIsUID, &attrs.decl, 803 clang_type, Type::ResolveState::Forward); 804 805 if (ClangASTContext::StartTagDeclarationDefinition(clang_type)) { 806 if (die.HasChildren()) { 807 bool is_signed = false; 808 enumerator_clang_type.IsIntegerType(is_signed); 809 ParseChildEnumerators(clang_type, is_signed, 810 type_sp->GetByteSize().getValueOr(0), die); 811 } 812 ClangASTContext::CompleteTagDeclarationDefinition(clang_type); 813 } else { 814 dwarf->GetObjectFile()->GetModule()->ReportError( 815 "DWARF DIE at 0x%8.8x named \"%s\" was not able to start its " 816 "definition.\nPlease file a bug and attach the file at the " 817 "start of this error message", 818 die.GetOffset(), attrs.name.GetCString()); 819 } 820 return type_sp; 821 } 822 823 TypeSP DWARFASTParserClang::ParseSubroutine(const DWARFDIE &die, 824 ParsedDWARFTypeAttributes &attrs) { 825 Log *log(LogChannelDWARF::GetLogIfAny(DWARF_LOG_TYPE_COMPLETION | 826 DWARF_LOG_LOOKUPS)); 827 828 SymbolFileDWARF *dwarf = die.GetDWARF(); 829 const dw_tag_t tag = die.Tag(); 830 831 bool is_variadic = false; 832 bool is_static = false; 833 bool has_template_params = false; 834 835 unsigned type_quals = 0; 836 837 std::string object_pointer_name; 838 if (attrs.object_pointer) { 839 const char *object_pointer_name_cstr = attrs.object_pointer.GetName(); 840 if (object_pointer_name_cstr) 841 object_pointer_name = object_pointer_name_cstr; 842 } 843 844 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(), 845 DW_TAG_value_to_name(tag), type_name_cstr); 846 847 CompilerType return_clang_type; 848 Type *func_type = NULL; 849 850 if (attrs.type.IsValid()) 851 func_type = dwarf->ResolveTypeUID(attrs.type.Reference(), true); 852 853 if (func_type) 854 return_clang_type = func_type->GetForwardCompilerType(); 855 else 856 return_clang_type = m_ast.GetBasicType(eBasicTypeVoid); 857 858 std::vector<CompilerType> function_param_types; 859 std::vector<clang::ParmVarDecl *> function_param_decls; 860 861 // Parse the function children for the parameters 862 863 DWARFDIE decl_ctx_die; 864 clang::DeclContext *containing_decl_ctx = 865 GetClangDeclContextContainingDIE(die, &decl_ctx_die); 866 const clang::Decl::Kind containing_decl_kind = 867 containing_decl_ctx->getDeclKind(); 868 869 bool is_cxx_method = DeclKindIsCXXClass(containing_decl_kind); 870 // Start off static. This will be set to false in 871 // ParseChildParameters(...) if we find a "this" parameters as the 872 // first parameter 873 if (is_cxx_method) { 874 is_static = true; 875 } 876 877 if (die.HasChildren()) { 878 bool skip_artificial = true; 879 ParseChildParameters(containing_decl_ctx, die, skip_artificial, is_static, 880 is_variadic, has_template_params, 881 function_param_types, function_param_decls, 882 type_quals); 883 } 884 885 bool ignore_containing_context = false; 886 // Check for templatized class member functions. If we had any 887 // DW_TAG_template_type_parameter or DW_TAG_template_value_parameter 888 // the DW_TAG_subprogram DIE, then we can't let this become a method in 889 // a class. Why? Because templatized functions are only emitted if one 890 // of the templatized methods is used in the current compile unit and 891 // we will end up with classes that may or may not include these member 892 // functions and this means one class won't match another class 893 // definition and it affects our ability to use a class in the clang 894 // expression parser. So for the greater good, we currently must not 895 // allow any template member functions in a class definition. 896 if (is_cxx_method && has_template_params) { 897 ignore_containing_context = true; 898 is_cxx_method = false; 899 } 900 901 // clang_type will get the function prototype clang type after this 902 // call 903 CompilerType clang_type = m_ast.CreateFunctionType( 904 return_clang_type, function_param_types.data(), 905 function_param_types.size(), is_variadic, type_quals); 906 907 if (attrs.name) { 908 bool type_handled = false; 909 if (tag == DW_TAG_subprogram || tag == DW_TAG_inlined_subroutine) { 910 ObjCLanguage::MethodName objc_method(attrs.name.GetStringRef(), true); 911 if (objc_method.IsValid(true)) { 912 CompilerType class_opaque_type; 913 ConstString class_name(objc_method.GetClassName()); 914 if (class_name) { 915 TypeSP complete_objc_class_type_sp( 916 dwarf->FindCompleteObjCDefinitionTypeForDIE(DWARFDIE(), 917 class_name, false)); 918 919 if (complete_objc_class_type_sp) { 920 CompilerType type_clang_forward_type = 921 complete_objc_class_type_sp->GetForwardCompilerType(); 922 if (ClangASTContext::IsObjCObjectOrInterfaceType( 923 type_clang_forward_type)) 924 class_opaque_type = type_clang_forward_type; 925 } 926 } 927 928 if (class_opaque_type) { 929 // If accessibility isn't set to anything valid, assume public 930 // for now... 931 if (attrs.accessibility == eAccessNone) 932 attrs.accessibility = eAccessPublic; 933 934 clang::ObjCMethodDecl *objc_method_decl = 935 m_ast.AddMethodToObjCObjectType( 936 class_opaque_type, attrs.name.GetCString(), clang_type, 937 attrs.accessibility, attrs.is_artificial, is_variadic, 938 attrs.is_objc_direct_call); 939 type_handled = objc_method_decl != NULL; 940 if (type_handled) { 941 LinkDeclContextToDIE(objc_method_decl, die); 942 m_ast.SetMetadataAsUserID(objc_method_decl, die.GetID()); 943 } else { 944 dwarf->GetObjectFile()->GetModule()->ReportError( 945 "{0x%8.8x}: invalid Objective-C method 0x%4.4x (%s), " 946 "please file a bug and attach the file at the start of " 947 "this error message", 948 die.GetOffset(), tag, DW_TAG_value_to_name(tag)); 949 } 950 } 951 } else if (is_cxx_method) { 952 // Look at the parent of this DIE and see if is is a class or 953 // struct and see if this is actually a C++ method 954 Type *class_type = dwarf->ResolveType(decl_ctx_die); 955 if (class_type) { 956 bool alternate_defn = false; 957 if (class_type->GetID() != decl_ctx_die.GetID() || 958 IsClangModuleFwdDecl(decl_ctx_die)) { 959 alternate_defn = true; 960 961 // We uniqued the parent class of this function to another 962 // class so we now need to associate all dies under 963 // "decl_ctx_die" to DIEs in the DIE for "class_type"... 964 DWARFDIE class_type_die = dwarf->GetDIE(class_type->GetID()); 965 966 if (class_type_die) { 967 std::vector<DWARFDIE> failures; 968 969 CopyUniqueClassMethodTypes(decl_ctx_die, class_type_die, 970 class_type, failures); 971 972 // FIXME do something with these failures that's 973 // smarter than just dropping them on the ground. 974 // Unfortunately classes don't like having stuff added 975 // to them after their definitions are complete... 976 977 Type *type_ptr = dwarf->GetDIEToType()[die.GetDIE()]; 978 if (type_ptr && type_ptr != DIE_IS_BEING_PARSED) { 979 return type_ptr->shared_from_this(); 980 } 981 } 982 } 983 984 if (attrs.specification.IsValid()) { 985 // We have a specification which we are going to base our 986 // function prototype off of, so we need this type to be 987 // completed so that the m_die_to_decl_ctx for the method in 988 // the specification has a valid clang decl context. 989 class_type->GetForwardCompilerType(); 990 // If we have a specification, then the function type should 991 // have been made with the specification and not with this 992 // die. 993 DWARFDIE spec_die = attrs.specification.Reference(); 994 clang::DeclContext *spec_clang_decl_ctx = 995 GetClangDeclContextForDIE(spec_die); 996 if (spec_clang_decl_ctx) { 997 LinkDeclContextToDIE(spec_clang_decl_ctx, die); 998 } else { 999 dwarf->GetObjectFile()->GetModule()->ReportWarning( 1000 "0x%8.8" PRIx64 ": DW_AT_specification(0x%8.8x" 1001 ") has no decl\n", 1002 die.GetID(), spec_die.GetOffset()); 1003 } 1004 type_handled = true; 1005 } else if (attrs.abstract_origin.IsValid()) { 1006 // We have a specification which we are going to base our 1007 // function prototype off of, so we need this type to be 1008 // completed so that the m_die_to_decl_ctx for the method in 1009 // the abstract origin has a valid clang decl context. 1010 class_type->GetForwardCompilerType(); 1011 1012 DWARFDIE abs_die = attrs.abstract_origin.Reference(); 1013 clang::DeclContext *abs_clang_decl_ctx = 1014 GetClangDeclContextForDIE(abs_die); 1015 if (abs_clang_decl_ctx) { 1016 LinkDeclContextToDIE(abs_clang_decl_ctx, die); 1017 } else { 1018 dwarf->GetObjectFile()->GetModule()->ReportWarning( 1019 "0x%8.8" PRIx64 ": DW_AT_abstract_origin(0x%8.8x" 1020 ") has no decl\n", 1021 die.GetID(), abs_die.GetOffset()); 1022 } 1023 type_handled = true; 1024 } else { 1025 CompilerType class_opaque_type = 1026 class_type->GetForwardCompilerType(); 1027 if (ClangASTContext::IsCXXClassType(class_opaque_type)) { 1028 if (class_opaque_type.IsBeingDefined() || alternate_defn) { 1029 if (!is_static && !die.HasChildren()) { 1030 // We have a C++ member function with no children (this 1031 // pointer!) and clang will get mad if we try and make 1032 // a function that isn't well formed in the DWARF, so 1033 // we will just skip it... 1034 type_handled = true; 1035 } else { 1036 bool add_method = true; 1037 if (alternate_defn) { 1038 // If an alternate definition for the class exists, 1039 // then add the method only if an equivalent is not 1040 // already present. 1041 clang::CXXRecordDecl *record_decl = 1042 m_ast.GetAsCXXRecordDecl( 1043 class_opaque_type.GetOpaqueQualType()); 1044 if (record_decl) { 1045 for (auto method_iter = record_decl->method_begin(); 1046 method_iter != record_decl->method_end(); 1047 method_iter++) { 1048 clang::CXXMethodDecl *method_decl = *method_iter; 1049 if (method_decl->getNameInfo().getAsString() == 1050 attrs.name.GetStringRef()) { 1051 if (method_decl->getType() == 1052 ClangUtil::GetQualType(clang_type)) { 1053 add_method = false; 1054 LinkDeclContextToDIE(method_decl, die); 1055 type_handled = true; 1056 1057 break; 1058 } 1059 } 1060 } 1061 } 1062 } 1063 1064 if (add_method) { 1065 llvm::PrettyStackTraceFormat stack_trace( 1066 "SymbolFileDWARF::ParseType() is adding a method " 1067 "%s to class %s in DIE 0x%8.8" PRIx64 " from %s", 1068 attrs.name.GetCString(), 1069 class_type->GetName().GetCString(), die.GetID(), 1070 dwarf->GetObjectFile() 1071 ->GetFileSpec() 1072 .GetPath() 1073 .c_str()); 1074 1075 const bool is_attr_used = false; 1076 // Neither GCC 4.2 nor clang++ currently set a valid 1077 // accessibility in the DWARF for C++ methods... 1078 // Default to public for now... 1079 if (attrs.accessibility == eAccessNone) 1080 attrs.accessibility = eAccessPublic; 1081 1082 clang::CXXMethodDecl *cxx_method_decl = 1083 m_ast.AddMethodToCXXRecordType( 1084 class_opaque_type.GetOpaqueQualType(), 1085 attrs.name.GetCString(), attrs.mangled_name, 1086 clang_type, attrs.accessibility, attrs.is_virtual, 1087 is_static, attrs.is_inline, attrs.is_explicit, 1088 is_attr_used, attrs.is_artificial); 1089 1090 type_handled = cxx_method_decl != NULL; 1091 // Artificial methods are always handled even when we 1092 // don't create a new declaration for them. 1093 type_handled |= attrs.is_artificial; 1094 1095 if (cxx_method_decl) { 1096 LinkDeclContextToDIE(cxx_method_decl, die); 1097 1098 ClangASTMetadata metadata; 1099 metadata.SetUserID(die.GetID()); 1100 1101 if (!object_pointer_name.empty()) { 1102 metadata.SetObjectPtrName( 1103 object_pointer_name.c_str()); 1104 LLDB_LOGF(log, 1105 "Setting object pointer name: %s on method " 1106 "object %p.\n", 1107 object_pointer_name.c_str(), 1108 static_cast<void *>(cxx_method_decl)); 1109 } 1110 m_ast.SetMetadata(cxx_method_decl, metadata); 1111 } else { 1112 ignore_containing_context = true; 1113 } 1114 } 1115 } 1116 } else { 1117 // We were asked to parse the type for a method in a 1118 // class, yet the class hasn't been asked to complete 1119 // itself through the clang::ExternalASTSource protocol, 1120 // so we need to just have the class complete itself and 1121 // do things the right way, then our 1122 // DIE should then have an entry in the 1123 // dwarf->GetDIEToType() map. First 1124 // we need to modify the dwarf->GetDIEToType() so it 1125 // doesn't think we are trying to parse this DIE 1126 // anymore... 1127 dwarf->GetDIEToType()[die.GetDIE()] = NULL; 1128 1129 // Now we get the full type to force our class type to 1130 // complete itself using the clang::ExternalASTSource 1131 // protocol which will parse all base classes and all 1132 // methods (including the method for this DIE). 1133 class_type->GetFullCompilerType(); 1134 1135 // The type for this DIE should have been filled in the 1136 // function call above 1137 Type *type_ptr = dwarf->GetDIEToType()[die.GetDIE()]; 1138 if (type_ptr && type_ptr != DIE_IS_BEING_PARSED) { 1139 return type_ptr->shared_from_this(); 1140 } 1141 1142 // FIXME This is fixing some even uglier behavior but we 1143 // really need to 1144 // uniq the methods of each class as well as the class 1145 // itself. <rdar://problem/11240464> 1146 type_handled = true; 1147 } 1148 } 1149 } 1150 } 1151 } 1152 } 1153 1154 if (!type_handled) { 1155 clang::FunctionDecl *function_decl = nullptr; 1156 clang::FunctionDecl *template_function_decl = nullptr; 1157 1158 if (attrs.abstract_origin.IsValid()) { 1159 DWARFDIE abs_die = attrs.abstract_origin.Reference(); 1160 1161 if (dwarf->ResolveType(abs_die)) { 1162 function_decl = llvm::dyn_cast_or_null<clang::FunctionDecl>( 1163 GetCachedClangDeclContextForDIE(abs_die)); 1164 1165 if (function_decl) { 1166 LinkDeclContextToDIE(function_decl, die); 1167 } 1168 } 1169 } 1170 1171 if (!function_decl) { 1172 // We just have a function that isn't part of a class 1173 function_decl = m_ast.CreateFunctionDeclaration( 1174 ignore_containing_context ? m_ast.GetTranslationUnitDecl() 1175 : containing_decl_ctx, 1176 attrs.name.GetCString(), clang_type, attrs.storage, 1177 attrs.is_inline); 1178 1179 if (has_template_params) { 1180 ClangASTContext::TemplateParameterInfos template_param_infos; 1181 ParseTemplateParameterInfos(die, template_param_infos); 1182 template_function_decl = m_ast.CreateFunctionDeclaration( 1183 ignore_containing_context ? m_ast.GetTranslationUnitDecl() 1184 : containing_decl_ctx, 1185 attrs.name.GetCString(), clang_type, attrs.storage, 1186 attrs.is_inline); 1187 clang::FunctionTemplateDecl *func_template_decl = 1188 m_ast.CreateFunctionTemplateDecl( 1189 containing_decl_ctx, template_function_decl, 1190 attrs.name.GetCString(), template_param_infos); 1191 m_ast.CreateFunctionTemplateSpecializationInfo( 1192 function_decl, func_template_decl, template_param_infos); 1193 } 1194 1195 lldbassert(function_decl); 1196 1197 if (function_decl) { 1198 LinkDeclContextToDIE(function_decl, die); 1199 1200 if (!function_param_decls.empty()) { 1201 m_ast.SetFunctionParameters(function_decl, 1202 &function_param_decls.front(), 1203 function_param_decls.size()); 1204 if (template_function_decl) 1205 m_ast.SetFunctionParameters(template_function_decl, 1206 &function_param_decls.front(), 1207 function_param_decls.size()); 1208 } 1209 1210 ClangASTMetadata metadata; 1211 metadata.SetUserID(die.GetID()); 1212 1213 if (!object_pointer_name.empty()) { 1214 metadata.SetObjectPtrName(object_pointer_name.c_str()); 1215 LLDB_LOGF(log, 1216 "Setting object pointer name: %s on function " 1217 "object %p.", 1218 object_pointer_name.c_str(), 1219 static_cast<void *>(function_decl)); 1220 } 1221 m_ast.SetMetadata(function_decl, metadata); 1222 } 1223 } 1224 } 1225 } 1226 return std::make_shared<Type>( 1227 die.GetID(), dwarf, attrs.name, llvm::None, nullptr, LLDB_INVALID_UID, 1228 Type::eEncodingIsUID, &attrs.decl, clang_type, Type::ResolveState::Full); 1229 } 1230 1231 TypeSP DWARFASTParserClang::ParseArrayType(const DWARFDIE &die, 1232 ParsedDWARFTypeAttributes &attrs) { 1233 SymbolFileDWARF *dwarf = die.GetDWARF(); 1234 1235 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(), 1236 DW_TAG_value_to_name(tag), type_name_cstr); 1237 1238 DWARFDIE type_die = attrs.type.Reference(); 1239 Type *element_type = dwarf->ResolveTypeUID(type_die, true); 1240 1241 if (!element_type) 1242 return nullptr; 1243 1244 llvm::Optional<SymbolFile::ArrayInfo> array_info = ParseChildArrayInfo(die); 1245 if (array_info) { 1246 attrs.byte_stride = array_info->byte_stride; 1247 attrs.bit_stride = array_info->bit_stride; 1248 } 1249 if (attrs.byte_stride == 0 && attrs.bit_stride == 0) 1250 attrs.byte_stride = element_type->GetByteSize().getValueOr(0); 1251 CompilerType array_element_type = element_type->GetForwardCompilerType(); 1252 1253 if (ClangASTContext::IsCXXClassType(array_element_type) && 1254 !array_element_type.GetCompleteType()) { 1255 ModuleSP module_sp = die.GetModule(); 1256 if (module_sp) { 1257 if (die.GetCU()->GetProducer() == eProducerClang) 1258 module_sp->ReportError( 1259 "DWARF DW_TAG_array_type DIE at 0x%8.8x has a " 1260 "class/union/struct element type DIE 0x%8.8x that is a " 1261 "forward declaration, not a complete definition.\nTry " 1262 "compiling the source file with -fstandalone-debug or " 1263 "disable -gmodules", 1264 die.GetOffset(), type_die.GetOffset()); 1265 else 1266 module_sp->ReportError( 1267 "DWARF DW_TAG_array_type DIE at 0x%8.8x has a " 1268 "class/union/struct element type DIE 0x%8.8x that is a " 1269 "forward declaration, not a complete definition.\nPlease " 1270 "file a bug against the compiler and include the " 1271 "preprocessed output for %s", 1272 die.GetOffset(), type_die.GetOffset(), GetUnitName(die).c_str()); 1273 } 1274 1275 // We have no choice other than to pretend that the element class 1276 // type is complete. If we don't do this, clang will crash when 1277 // trying to layout the class. Since we provide layout 1278 // assistance, all ivars in this class and other classes will be 1279 // fine, this is the best we can do short of crashing. 1280 if (ClangASTContext::StartTagDeclarationDefinition(array_element_type)) { 1281 ClangASTContext::CompleteTagDeclarationDefinition(array_element_type); 1282 } else { 1283 module_sp->ReportError("DWARF DIE at 0x%8.8x was not able to " 1284 "start its definition.\nPlease file a " 1285 "bug and attach the file at the start " 1286 "of this error message", 1287 type_die.GetOffset()); 1288 } 1289 } 1290 1291 uint64_t array_element_bit_stride = 1292 attrs.byte_stride * 8 + attrs.bit_stride; 1293 CompilerType clang_type; 1294 if (array_info && array_info->element_orders.size() > 0) { 1295 uint64_t num_elements = 0; 1296 auto end = array_info->element_orders.rend(); 1297 for (auto pos = array_info->element_orders.rbegin(); pos != end; ++pos) { 1298 num_elements = *pos; 1299 clang_type = m_ast.CreateArrayType(array_element_type, num_elements, 1300 attrs.is_vector); 1301 array_element_type = clang_type; 1302 array_element_bit_stride = num_elements 1303 ? array_element_bit_stride * num_elements 1304 : array_element_bit_stride; 1305 } 1306 } else { 1307 clang_type = 1308 m_ast.CreateArrayType(array_element_type, 0, attrs.is_vector); 1309 } 1310 ConstString empty_name; 1311 TypeSP type_sp = std::make_shared<Type>( 1312 die.GetID(), dwarf, empty_name, array_element_bit_stride / 8, nullptr, 1313 dwarf->GetUID(type_die), Type::eEncodingIsUID, &attrs.decl, clang_type, 1314 Type::ResolveState::Full); 1315 type_sp->SetEncodingType(element_type); 1316 const clang::Type *type = ClangUtil::GetQualType(clang_type).getTypePtr(); 1317 m_ast.SetMetadataAsUserID(type, die.GetID()); 1318 return type_sp; 1319 } 1320 1321 TypeSP DWARFASTParserClang::ParsePointerToMemberType( 1322 const DWARFDIE &die, const ParsedDWARFTypeAttributes &attrs) { 1323 SymbolFileDWARF *dwarf = die.GetDWARF(); 1324 Type *pointee_type = dwarf->ResolveTypeUID(attrs.type.Reference(), true); 1325 Type *class_type = 1326 dwarf->ResolveTypeUID(attrs.containing_type.Reference(), true); 1327 1328 CompilerType pointee_clang_type = pointee_type->GetForwardCompilerType(); 1329 CompilerType class_clang_type = class_type->GetLayoutCompilerType(); 1330 1331 CompilerType clang_type = ClangASTContext::CreateMemberPointerType( 1332 class_clang_type, pointee_clang_type); 1333 1334 if (llvm::Optional<uint64_t> clang_type_size = 1335 clang_type.GetByteSize(nullptr)) { 1336 return std::make_shared<Type>(die.GetID(), dwarf, attrs.name, 1337 *clang_type_size, nullptr, LLDB_INVALID_UID, 1338 Type::eEncodingIsUID, nullptr, clang_type, 1339 Type::ResolveState::Forward); 1340 } 1341 return nullptr; 1342 } 1343 1344 TypeSP DWARFASTParserClang::UpdateSymbolContextScopeForType( 1345 const SymbolContext &sc, const DWARFDIE &die, TypeSP type_sp) { 1346 if (!type_sp) 1347 return type_sp; 1348 1349 SymbolFileDWARF *dwarf = die.GetDWARF(); 1350 TypeList &type_list = dwarf->GetTypeList(); 1351 DWARFDIE sc_parent_die = SymbolFileDWARF::GetParentSymbolContextDIE(die); 1352 dw_tag_t sc_parent_tag = sc_parent_die.Tag(); 1353 1354 SymbolContextScope *symbol_context_scope = nullptr; 1355 if (sc_parent_tag == DW_TAG_compile_unit || 1356 sc_parent_tag == DW_TAG_partial_unit) { 1357 symbol_context_scope = sc.comp_unit; 1358 } else if (sc.function != nullptr && sc_parent_die) { 1359 symbol_context_scope = 1360 sc.function->GetBlock(true).FindBlockByID(sc_parent_die.GetID()); 1361 if (symbol_context_scope == nullptr) 1362 symbol_context_scope = sc.function; 1363 } else { 1364 symbol_context_scope = sc.module_sp.get(); 1365 } 1366 1367 if (symbol_context_scope != nullptr) 1368 type_sp->SetSymbolContextScope(symbol_context_scope); 1369 1370 // We are ready to put this type into the uniqued list up at the module 1371 // level. 1372 type_list.Insert(type_sp); 1373 1374 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 1375 return type_sp; 1376 } 1377 1378 TypeSP 1379 DWARFASTParserClang::ParseStructureLikeDIE(const SymbolContext &sc, 1380 const DWARFDIE &die, 1381 ParsedDWARFTypeAttributes &attrs) { 1382 TypeSP type_sp; 1383 CompilerType clang_type; 1384 const dw_tag_t tag = die.Tag(); 1385 SymbolFileDWARF *dwarf = die.GetDWARF(); 1386 LanguageType cu_language = die.GetLanguage(); 1387 Log *log = LogChannelDWARF::GetLogIfAll(DWARF_LOG_TYPE_COMPLETION | 1388 DWARF_LOG_LOOKUPS); 1389 1390 // UniqueDWARFASTType is large, so don't create a local variables on the 1391 // stack, put it on the heap. This function is often called recursively and 1392 // clang isn't good at sharing the stack space for variables in different 1393 // blocks. 1394 auto unique_ast_entry_up = std::make_unique<UniqueDWARFASTType>(); 1395 1396 ConstString unique_typename(attrs.name); 1397 Declaration unique_decl(attrs.decl); 1398 1399 if (attrs.name) { 1400 if (Language::LanguageIsCPlusPlus(cu_language)) { 1401 // For C++, we rely solely upon the one definition rule that says 1402 // only one thing can exist at a given decl context. We ignore the 1403 // file and line that things are declared on. 1404 std::string qualified_name; 1405 if (die.GetQualifiedName(qualified_name)) 1406 unique_typename = ConstString(qualified_name); 1407 unique_decl.Clear(); 1408 } 1409 1410 if (dwarf->GetUniqueDWARFASTTypeMap().Find( 1411 unique_typename, die, unique_decl, attrs.byte_size.getValueOr(-1), 1412 *unique_ast_entry_up)) { 1413 type_sp = unique_ast_entry_up->m_type_sp; 1414 if (type_sp) { 1415 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 1416 LinkDeclContextToDIE( 1417 GetCachedClangDeclContextForDIE(unique_ast_entry_up->m_die), die); 1418 return type_sp; 1419 } 1420 } 1421 } 1422 1423 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(), 1424 DW_TAG_value_to_name(tag), type_name_cstr); 1425 1426 int tag_decl_kind = -1; 1427 AccessType default_accessibility = eAccessNone; 1428 if (tag == DW_TAG_structure_type) { 1429 tag_decl_kind = clang::TTK_Struct; 1430 default_accessibility = eAccessPublic; 1431 } else if (tag == DW_TAG_union_type) { 1432 tag_decl_kind = clang::TTK_Union; 1433 default_accessibility = eAccessPublic; 1434 } else if (tag == DW_TAG_class_type) { 1435 tag_decl_kind = clang::TTK_Class; 1436 default_accessibility = eAccessPrivate; 1437 } 1438 1439 if (attrs.byte_size && *attrs.byte_size == 0 && attrs.name && 1440 !die.HasChildren() && cu_language == eLanguageTypeObjC) { 1441 // Work around an issue with clang at the moment where forward 1442 // declarations for objective C classes are emitted as: 1443 // DW_TAG_structure_type [2] 1444 // DW_AT_name( "ForwardObjcClass" ) 1445 // DW_AT_byte_size( 0x00 ) 1446 // DW_AT_decl_file( "..." ) 1447 // DW_AT_decl_line( 1 ) 1448 // 1449 // Note that there is no DW_AT_declaration and there are no children, 1450 // and the byte size is zero. 1451 attrs.is_forward_declaration = true; 1452 } 1453 1454 if (attrs.class_language == eLanguageTypeObjC || 1455 attrs.class_language == eLanguageTypeObjC_plus_plus) { 1456 if (!attrs.is_complete_objc_class && 1457 die.Supports_DW_AT_APPLE_objc_complete_type()) { 1458 // We have a valid eSymbolTypeObjCClass class symbol whose name 1459 // matches the current objective C class that we are trying to find 1460 // and this DIE isn't the complete definition (we checked 1461 // is_complete_objc_class above and know it is false), so the real 1462 // definition is in here somewhere 1463 type_sp = 1464 dwarf->FindCompleteObjCDefinitionTypeForDIE(die, attrs.name, true); 1465 1466 if (!type_sp) { 1467 SymbolFileDWARFDebugMap *debug_map_symfile = 1468 dwarf->GetDebugMapSymfile(); 1469 if (debug_map_symfile) { 1470 // We weren't able to find a full declaration in this DWARF, 1471 // see if we have a declaration anywhere else... 1472 type_sp = debug_map_symfile->FindCompleteObjCDefinitionTypeForDIE( 1473 die, attrs.name, true); 1474 } 1475 } 1476 1477 if (type_sp) { 1478 if (log) { 1479 dwarf->GetObjectFile()->GetModule()->LogMessage( 1480 log, 1481 "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is an " 1482 "incomplete objc type, complete type is 0x%8.8" PRIx64, 1483 static_cast<void *>(this), die.GetOffset(), 1484 DW_TAG_value_to_name(tag), attrs.name.GetCString(), 1485 type_sp->GetID()); 1486 } 1487 1488 // We found a real definition for this type elsewhere so lets use 1489 // it and cache the fact that we found a complete type for this 1490 // die 1491 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 1492 return type_sp; 1493 } 1494 } 1495 } 1496 1497 if (attrs.is_forward_declaration) { 1498 // We have a forward declaration to a type and we need to try and 1499 // find a full declaration. We look in the current type index just in 1500 // case we have a forward declaration followed by an actual 1501 // declarations in the DWARF. If this fails, we need to look 1502 // elsewhere... 1503 if (log) { 1504 dwarf->GetObjectFile()->GetModule()->LogMessage( 1505 log, 1506 "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is a " 1507 "forward declaration, trying to find complete type", 1508 static_cast<void *>(this), die.GetOffset(), DW_TAG_value_to_name(tag), 1509 attrs.name.GetCString()); 1510 } 1511 1512 // See if the type comes from a Clang module and if so, track down 1513 // that type. 1514 type_sp = ParseTypeFromClangModule(sc, die, log); 1515 if (type_sp) 1516 return type_sp; 1517 1518 DWARFDeclContext die_decl_ctx; 1519 die.GetDWARFDeclContext(die_decl_ctx); 1520 1521 // type_sp = FindDefinitionTypeForDIE (dwarf_cu, die, 1522 // type_name_const_str); 1523 type_sp = dwarf->FindDefinitionTypeForDWARFDeclContext(die_decl_ctx); 1524 1525 if (!type_sp) { 1526 SymbolFileDWARFDebugMap *debug_map_symfile = dwarf->GetDebugMapSymfile(); 1527 if (debug_map_symfile) { 1528 // We weren't able to find a full declaration in this DWARF, see 1529 // if we have a declaration anywhere else... 1530 type_sp = debug_map_symfile->FindDefinitionTypeForDWARFDeclContext( 1531 die_decl_ctx); 1532 } 1533 } 1534 1535 if (type_sp) { 1536 if (log) { 1537 dwarf->GetObjectFile()->GetModule()->LogMessage( 1538 log, 1539 "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is a " 1540 "forward declaration, complete type is 0x%8.8" PRIx64, 1541 static_cast<void *>(this), die.GetOffset(), 1542 DW_TAG_value_to_name(tag), attrs.name.GetCString(), 1543 type_sp->GetID()); 1544 } 1545 1546 // We found a real definition for this type elsewhere so lets use 1547 // it and cache the fact that we found a complete type for this die 1548 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 1549 clang::DeclContext *defn_decl_ctx = 1550 GetCachedClangDeclContextForDIE(dwarf->GetDIE(type_sp->GetID())); 1551 if (defn_decl_ctx) 1552 LinkDeclContextToDIE(defn_decl_ctx, die); 1553 return type_sp; 1554 } 1555 } 1556 assert(tag_decl_kind != -1); 1557 bool clang_type_was_created = false; 1558 clang_type.SetCompilerType( 1559 &m_ast, dwarf->GetForwardDeclDieToClangType().lookup(die.GetDIE())); 1560 if (!clang_type) { 1561 clang::DeclContext *decl_ctx = 1562 GetClangDeclContextContainingDIE(die, nullptr); 1563 1564 // If your decl context is a record that was imported from another 1565 // AST context (in the gmodules case), we need to make sure the type 1566 // backing the Decl is complete before adding children to it. This is 1567 // not an issue in the non-gmodules case because the debug info will 1568 // always contain a full definition of parent types in that case. 1569 CompleteExternalTagDeclType(m_ast, GetClangASTImporter(), decl_ctx, die, 1570 attrs.name.GetCString()); 1571 1572 if (attrs.accessibility == eAccessNone && decl_ctx) { 1573 // Check the decl context that contains this class/struct/union. If 1574 // it is a class we must give it an accessibility. 1575 const clang::Decl::Kind containing_decl_kind = decl_ctx->getDeclKind(); 1576 if (DeclKindIsCXXClass(containing_decl_kind)) 1577 attrs.accessibility = default_accessibility; 1578 } 1579 1580 ClangASTMetadata metadata; 1581 metadata.SetUserID(die.GetID()); 1582 metadata.SetIsDynamicCXXType(dwarf->ClassOrStructIsVirtual(die)); 1583 1584 if (attrs.name.GetStringRef().contains('<')) { 1585 ClangASTContext::TemplateParameterInfos template_param_infos; 1586 if (ParseTemplateParameterInfos(die, template_param_infos)) { 1587 clang::ClassTemplateDecl *class_template_decl = 1588 m_ast.ParseClassTemplateDecl(decl_ctx, attrs.accessibility, 1589 attrs.name.GetCString(), tag_decl_kind, 1590 template_param_infos); 1591 if (!class_template_decl) { 1592 if (log) { 1593 dwarf->GetObjectFile()->GetModule()->LogMessage( 1594 log, 1595 "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" " 1596 "clang::ClassTemplateDecl failed to return a decl.", 1597 static_cast<void *>(this), die.GetOffset(), 1598 DW_TAG_value_to_name(tag), attrs.name.GetCString()); 1599 } 1600 return TypeSP(); 1601 } 1602 1603 clang::ClassTemplateSpecializationDecl *class_specialization_decl = 1604 m_ast.CreateClassTemplateSpecializationDecl( 1605 decl_ctx, class_template_decl, tag_decl_kind, 1606 template_param_infos); 1607 clang_type = m_ast.CreateClassTemplateSpecializationType( 1608 class_specialization_decl); 1609 clang_type_was_created = true; 1610 1611 m_ast.SetMetadata(class_template_decl, metadata); 1612 m_ast.SetMetadata(class_specialization_decl, metadata); 1613 } 1614 } 1615 1616 if (!clang_type_was_created) { 1617 clang_type_was_created = true; 1618 clang_type = m_ast.CreateRecordType( 1619 decl_ctx, attrs.accessibility, attrs.name.GetCString(), tag_decl_kind, 1620 attrs.class_language, &metadata, attrs.exports_symbols); 1621 } 1622 } 1623 1624 // Store a forward declaration to this class type in case any 1625 // parameters in any class methods need it for the clang types for 1626 // function prototypes. 1627 LinkDeclContextToDIE(m_ast.GetDeclContextForType(clang_type), die); 1628 type_sp = std::make_shared<Type>(die.GetID(), dwarf, attrs.name, 1629 attrs.byte_size, nullptr, LLDB_INVALID_UID, 1630 Type::eEncodingIsUID, &attrs.decl, 1631 clang_type, Type::ResolveState::Forward); 1632 1633 type_sp->SetIsCompleteObjCClass(attrs.is_complete_objc_class); 1634 1635 // Add our type to the unique type map so we don't end up creating many 1636 // copies of the same type over and over in the ASTContext for our 1637 // module 1638 unique_ast_entry_up->m_type_sp = type_sp; 1639 unique_ast_entry_up->m_die = die; 1640 unique_ast_entry_up->m_declaration = unique_decl; 1641 unique_ast_entry_up->m_byte_size = attrs.byte_size.getValueOr(0); 1642 dwarf->GetUniqueDWARFASTTypeMap().Insert(unique_typename, 1643 *unique_ast_entry_up); 1644 1645 if (attrs.is_forward_declaration && die.HasChildren()) { 1646 // Check to see if the DIE actually has a definition, some version of 1647 // GCC will 1648 // emit DIEs with DW_AT_declaration set to true, but yet still have 1649 // subprogram, members, or inheritance, so we can't trust it 1650 DWARFDIE child_die = die.GetFirstChild(); 1651 while (child_die) { 1652 switch (child_die.Tag()) { 1653 case DW_TAG_inheritance: 1654 case DW_TAG_subprogram: 1655 case DW_TAG_member: 1656 case DW_TAG_APPLE_property: 1657 case DW_TAG_class_type: 1658 case DW_TAG_structure_type: 1659 case DW_TAG_enumeration_type: 1660 case DW_TAG_typedef: 1661 case DW_TAG_union_type: 1662 child_die.Clear(); 1663 attrs.is_forward_declaration = false; 1664 break; 1665 default: 1666 child_die = child_die.GetSibling(); 1667 break; 1668 } 1669 } 1670 } 1671 1672 if (!attrs.is_forward_declaration) { 1673 // Always start the definition for a class type so that if the class 1674 // has child classes or types that require the class to be created 1675 // for use as their decl contexts the class will be ready to accept 1676 // these child definitions. 1677 if (!die.HasChildren()) { 1678 // No children for this struct/union/class, lets finish it 1679 if (ClangASTContext::StartTagDeclarationDefinition(clang_type)) { 1680 ClangASTContext::CompleteTagDeclarationDefinition(clang_type); 1681 } else { 1682 dwarf->GetObjectFile()->GetModule()->ReportError( 1683 "DWARF DIE at 0x%8.8x named \"%s\" was not able to start its " 1684 "definition.\nPlease file a bug and attach the file at the " 1685 "start of this error message", 1686 die.GetOffset(), attrs.name.GetCString()); 1687 } 1688 1689 if (tag == DW_TAG_structure_type) // this only applies in C 1690 { 1691 clang::RecordDecl *record_decl = 1692 ClangASTContext::GetAsRecordDecl(clang_type); 1693 1694 if (record_decl) { 1695 GetClangASTImporter().SetRecordLayout( 1696 record_decl, ClangASTImporter::LayoutInfo()); 1697 } 1698 } 1699 } else if (clang_type_was_created) { 1700 // Start the definition if the class is not objective C since the 1701 // underlying decls respond to isCompleteDefinition(). Objective 1702 // C decls don't respond to isCompleteDefinition() so we can't 1703 // start the declaration definition right away. For C++ 1704 // class/union/structs we want to start the definition in case the 1705 // class is needed as the declaration context for a contained class 1706 // or type without the need to complete that type.. 1707 1708 if (attrs.class_language != eLanguageTypeObjC && 1709 attrs.class_language != eLanguageTypeObjC_plus_plus) 1710 ClangASTContext::StartTagDeclarationDefinition(clang_type); 1711 1712 // Leave this as a forward declaration until we need to know the 1713 // details of the type. lldb_private::Type will automatically call 1714 // the SymbolFile virtual function 1715 // "SymbolFileDWARF::CompleteType(Type *)" When the definition 1716 // needs to be defined. 1717 assert(!dwarf->GetForwardDeclClangTypeToDie().count( 1718 ClangUtil::RemoveFastQualifiers(clang_type) 1719 .GetOpaqueQualType()) && 1720 "Type already in the forward declaration map!"); 1721 // Can't assume m_ast.GetSymbolFile() is actually a 1722 // SymbolFileDWARF, it can be a SymbolFileDWARFDebugMap for Apple 1723 // binaries. 1724 dwarf->GetForwardDeclDieToClangType()[die.GetDIE()] = 1725 clang_type.GetOpaqueQualType(); 1726 dwarf->GetForwardDeclClangTypeToDie() 1727 [ClangUtil::RemoveFastQualifiers(clang_type).GetOpaqueQualType()] = 1728 die.GetID(); 1729 m_ast.SetHasExternalStorage(clang_type.GetOpaqueQualType(), true); 1730 } 1731 } 1732 1733 // If we made a clang type, set the trivial abi if applicable: We only 1734 // do this for pass by value - which implies the Trivial ABI. There 1735 // isn't a way to assert that something that would normally be pass by 1736 // value is pass by reference, so we ignore that attribute if set. 1737 if (attrs.calling_convention == llvm::dwarf::DW_CC_pass_by_value) { 1738 clang::CXXRecordDecl *record_decl = 1739 m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType()); 1740 if (record_decl && record_decl->getDefinition()) { 1741 record_decl->setHasTrivialSpecialMemberForCall(); 1742 } 1743 } 1744 1745 if (attrs.calling_convention == llvm::dwarf::DW_CC_pass_by_reference) { 1746 clang::CXXRecordDecl *record_decl = 1747 m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType()); 1748 if (record_decl) 1749 record_decl->setArgPassingRestrictions( 1750 clang::RecordDecl::APK_CannotPassInRegs); 1751 } 1752 return type_sp; 1753 } 1754 1755 // DWARF parsing functions 1756 1757 class DWARFASTParserClang::DelayedAddObjCClassProperty { 1758 public: 1759 DelayedAddObjCClassProperty( 1760 const CompilerType &class_opaque_type, const char *property_name, 1761 const CompilerType &property_opaque_type, // The property type is only 1762 // required if you don't have an 1763 // ivar decl 1764 clang::ObjCIvarDecl *ivar_decl, const char *property_setter_name, 1765 const char *property_getter_name, uint32_t property_attributes, 1766 const ClangASTMetadata *metadata) 1767 : m_class_opaque_type(class_opaque_type), m_property_name(property_name), 1768 m_property_opaque_type(property_opaque_type), m_ivar_decl(ivar_decl), 1769 m_property_setter_name(property_setter_name), 1770 m_property_getter_name(property_getter_name), 1771 m_property_attributes(property_attributes) { 1772 if (metadata != nullptr) { 1773 m_metadata_up.reset(new ClangASTMetadata()); 1774 *m_metadata_up = *metadata; 1775 } 1776 } 1777 1778 DelayedAddObjCClassProperty(const DelayedAddObjCClassProperty &rhs) { 1779 *this = rhs; 1780 } 1781 1782 DelayedAddObjCClassProperty & 1783 operator=(const DelayedAddObjCClassProperty &rhs) { 1784 m_class_opaque_type = rhs.m_class_opaque_type; 1785 m_property_name = rhs.m_property_name; 1786 m_property_opaque_type = rhs.m_property_opaque_type; 1787 m_ivar_decl = rhs.m_ivar_decl; 1788 m_property_setter_name = rhs.m_property_setter_name; 1789 m_property_getter_name = rhs.m_property_getter_name; 1790 m_property_attributes = rhs.m_property_attributes; 1791 1792 if (rhs.m_metadata_up) { 1793 m_metadata_up.reset(new ClangASTMetadata()); 1794 *m_metadata_up = *rhs.m_metadata_up; 1795 } 1796 return *this; 1797 } 1798 1799 bool Finalize() { 1800 return ClangASTContext::AddObjCClassProperty( 1801 m_class_opaque_type, m_property_name, m_property_opaque_type, 1802 m_ivar_decl, m_property_setter_name, m_property_getter_name, 1803 m_property_attributes, m_metadata_up.get()); 1804 } 1805 1806 private: 1807 CompilerType m_class_opaque_type; 1808 const char *m_property_name; 1809 CompilerType m_property_opaque_type; 1810 clang::ObjCIvarDecl *m_ivar_decl; 1811 const char *m_property_setter_name; 1812 const char *m_property_getter_name; 1813 uint32_t m_property_attributes; 1814 std::unique_ptr<ClangASTMetadata> m_metadata_up; 1815 }; 1816 1817 bool DWARFASTParserClang::ParseTemplateDIE( 1818 const DWARFDIE &die, 1819 ClangASTContext::TemplateParameterInfos &template_param_infos) { 1820 const dw_tag_t tag = die.Tag(); 1821 bool is_template_template_argument = false; 1822 1823 switch (tag) { 1824 case DW_TAG_GNU_template_parameter_pack: { 1825 template_param_infos.packed_args.reset( 1826 new ClangASTContext::TemplateParameterInfos); 1827 for (DWARFDIE child_die = die.GetFirstChild(); child_die.IsValid(); 1828 child_die = child_die.GetSibling()) { 1829 if (!ParseTemplateDIE(child_die, *template_param_infos.packed_args)) 1830 return false; 1831 } 1832 if (const char *name = die.GetName()) { 1833 template_param_infos.pack_name = name; 1834 } 1835 return true; 1836 } 1837 case DW_TAG_GNU_template_template_param: 1838 is_template_template_argument = true; 1839 LLVM_FALLTHROUGH; 1840 case DW_TAG_template_type_parameter: 1841 case DW_TAG_template_value_parameter: { 1842 DWARFAttributes attributes; 1843 const size_t num_attributes = die.GetAttributes(attributes); 1844 const char *name = nullptr; 1845 const char *template_name = nullptr; 1846 CompilerType clang_type; 1847 uint64_t uval64 = 0; 1848 bool uval64_valid = false; 1849 if (num_attributes > 0) { 1850 DWARFFormValue form_value; 1851 for (size_t i = 0; i < num_attributes; ++i) { 1852 const dw_attr_t attr = attributes.AttributeAtIndex(i); 1853 1854 switch (attr) { 1855 case DW_AT_name: 1856 if (attributes.ExtractFormValueAtIndex(i, form_value)) 1857 name = form_value.AsCString(); 1858 break; 1859 1860 case DW_AT_GNU_template_name: 1861 if (attributes.ExtractFormValueAtIndex(i, form_value)) 1862 template_name = form_value.AsCString(); 1863 break; 1864 1865 case DW_AT_type: 1866 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 1867 Type *lldb_type = die.ResolveTypeUID(form_value.Reference()); 1868 if (lldb_type) 1869 clang_type = lldb_type->GetForwardCompilerType(); 1870 } 1871 break; 1872 1873 case DW_AT_const_value: 1874 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 1875 uval64_valid = true; 1876 uval64 = form_value.Unsigned(); 1877 } 1878 break; 1879 default: 1880 break; 1881 } 1882 } 1883 1884 clang::ASTContext &ast = m_ast.getASTContext(); 1885 if (!clang_type) 1886 clang_type = m_ast.GetBasicType(eBasicTypeVoid); 1887 1888 if (!is_template_template_argument) { 1889 bool is_signed = false; 1890 if (name && name[0]) 1891 template_param_infos.names.push_back(name); 1892 else 1893 template_param_infos.names.push_back(NULL); 1894 1895 // Get the signed value for any integer or enumeration if available 1896 clang_type.IsIntegerOrEnumerationType(is_signed); 1897 1898 if (tag == DW_TAG_template_value_parameter && uval64_valid) { 1899 llvm::Optional<uint64_t> size = clang_type.GetBitSize(nullptr); 1900 if (!size) 1901 return false; 1902 llvm::APInt apint(*size, uval64, is_signed); 1903 template_param_infos.args.push_back( 1904 clang::TemplateArgument(ast, llvm::APSInt(apint, !is_signed), 1905 ClangUtil::GetQualType(clang_type))); 1906 } else { 1907 template_param_infos.args.push_back( 1908 clang::TemplateArgument(ClangUtil::GetQualType(clang_type))); 1909 } 1910 } else { 1911 auto *tplt_type = m_ast.CreateTemplateTemplateParmDecl(template_name); 1912 template_param_infos.names.push_back(name); 1913 template_param_infos.args.push_back( 1914 clang::TemplateArgument(clang::TemplateName(tplt_type))); 1915 } 1916 } 1917 } 1918 return true; 1919 1920 default: 1921 break; 1922 } 1923 return false; 1924 } 1925 1926 bool DWARFASTParserClang::ParseTemplateParameterInfos( 1927 const DWARFDIE &parent_die, 1928 ClangASTContext::TemplateParameterInfos &template_param_infos) { 1929 1930 if (!parent_die) 1931 return false; 1932 1933 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 1934 die = die.GetSibling()) { 1935 const dw_tag_t tag = die.Tag(); 1936 1937 switch (tag) { 1938 case DW_TAG_template_type_parameter: 1939 case DW_TAG_template_value_parameter: 1940 case DW_TAG_GNU_template_parameter_pack: 1941 case DW_TAG_GNU_template_template_param: 1942 ParseTemplateDIE(die, template_param_infos); 1943 break; 1944 1945 default: 1946 break; 1947 } 1948 } 1949 if (template_param_infos.args.empty()) 1950 return false; 1951 return template_param_infos.args.size() == template_param_infos.names.size(); 1952 } 1953 1954 bool DWARFASTParserClang::CompleteRecordType(const DWARFDIE &die, 1955 lldb_private::Type *type, 1956 CompilerType &clang_type) { 1957 const dw_tag_t tag = die.Tag(); 1958 SymbolFileDWARF *dwarf = die.GetDWARF(); 1959 1960 ClangASTImporter::LayoutInfo layout_info; 1961 1962 { 1963 if (die.HasChildren()) { 1964 LanguageType class_language = eLanguageTypeUnknown; 1965 if (ClangASTContext::IsObjCObjectOrInterfaceType(clang_type)) { 1966 class_language = eLanguageTypeObjC; 1967 // For objective C we don't start the definition when the class is 1968 // created. 1969 ClangASTContext::StartTagDeclarationDefinition(clang_type); 1970 } 1971 1972 int tag_decl_kind = -1; 1973 AccessType default_accessibility = eAccessNone; 1974 if (tag == DW_TAG_structure_type) { 1975 tag_decl_kind = clang::TTK_Struct; 1976 default_accessibility = eAccessPublic; 1977 } else if (tag == DW_TAG_union_type) { 1978 tag_decl_kind = clang::TTK_Union; 1979 default_accessibility = eAccessPublic; 1980 } else if (tag == DW_TAG_class_type) { 1981 tag_decl_kind = clang::TTK_Class; 1982 default_accessibility = eAccessPrivate; 1983 } 1984 1985 std::vector<std::unique_ptr<clang::CXXBaseSpecifier>> bases; 1986 std::vector<int> member_accessibilities; 1987 bool is_a_class = false; 1988 // Parse members and base classes first 1989 std::vector<DWARFDIE> member_function_dies; 1990 1991 DelayedPropertyList delayed_properties; 1992 ParseChildMembers(die, clang_type, class_language, bases, 1993 member_accessibilities, member_function_dies, 1994 delayed_properties, default_accessibility, is_a_class, 1995 layout_info); 1996 1997 // Now parse any methods if there were any... 1998 for (const DWARFDIE &die : member_function_dies) 1999 dwarf->ResolveType(die); 2000 2001 if (class_language == eLanguageTypeObjC) { 2002 ConstString class_name(clang_type.GetTypeName()); 2003 if (class_name) { 2004 DIEArray method_die_offsets; 2005 dwarf->GetObjCMethodDIEOffsets(class_name, method_die_offsets); 2006 2007 if (!method_die_offsets.empty()) { 2008 DWARFDebugInfo *debug_info = dwarf->DebugInfo(); 2009 2010 const size_t num_matches = method_die_offsets.size(); 2011 for (size_t i = 0; i < num_matches; ++i) { 2012 const DIERef &die_ref = method_die_offsets[i]; 2013 DWARFDIE method_die = debug_info->GetDIE(die_ref); 2014 2015 if (method_die) 2016 method_die.ResolveType(); 2017 } 2018 } 2019 2020 for (DelayedPropertyList::iterator pi = delayed_properties.begin(), 2021 pe = delayed_properties.end(); 2022 pi != pe; ++pi) 2023 pi->Finalize(); 2024 } 2025 } 2026 2027 // If we have a DW_TAG_structure_type instead of a DW_TAG_class_type we 2028 // need to tell the clang type it is actually a class. 2029 if (class_language != eLanguageTypeObjC) { 2030 if (is_a_class && tag_decl_kind != clang::TTK_Class) 2031 m_ast.SetTagTypeKind(ClangUtil::GetQualType(clang_type), 2032 clang::TTK_Class); 2033 } 2034 2035 // Since DW_TAG_structure_type gets used for both classes and 2036 // structures, we may need to set any DW_TAG_member fields to have a 2037 // "private" access if none was specified. When we parsed the child 2038 // members we tracked that actual accessibility value for each 2039 // DW_TAG_member in the "member_accessibilities" array. If the value 2040 // for the member is zero, then it was set to the 2041 // "default_accessibility" which for structs was "public". Below we 2042 // correct this by setting any fields to "private" that weren't 2043 // correctly set. 2044 if (is_a_class && !member_accessibilities.empty()) { 2045 // This is a class and all members that didn't have their access 2046 // specified are private. 2047 m_ast.SetDefaultAccessForRecordFields( 2048 m_ast.GetAsRecordDecl(clang_type), eAccessPrivate, 2049 &member_accessibilities.front(), member_accessibilities.size()); 2050 } 2051 2052 if (!bases.empty()) { 2053 // Make sure all base classes refer to complete types and not forward 2054 // declarations. If we don't do this, clang will crash with an 2055 // assertion in the call to clang_type.TransferBaseClasses() 2056 for (const auto &base_class : bases) { 2057 clang::TypeSourceInfo *type_source_info = 2058 base_class->getTypeSourceInfo(); 2059 if (type_source_info) { 2060 CompilerType base_class_type = 2061 m_ast.GetType(type_source_info->getType()); 2062 if (!base_class_type.GetCompleteType()) { 2063 auto module = dwarf->GetObjectFile()->GetModule(); 2064 module->ReportError(":: Class '%s' has a base class '%s' which " 2065 "does not have a complete definition.", 2066 die.GetName(), 2067 base_class_type.GetTypeName().GetCString()); 2068 if (die.GetCU()->GetProducer() == eProducerClang) 2069 module->ReportError(":: Try compiling the source file with " 2070 "-fstandalone-debug."); 2071 2072 // We have no choice other than to pretend that the base class 2073 // is complete. If we don't do this, clang will crash when we 2074 // call setBases() inside of 2075 // "clang_type.TransferBaseClasses()" below. Since we 2076 // provide layout assistance, all ivars in this class and other 2077 // classes will be fine, this is the best we can do short of 2078 // crashing. 2079 if (ClangASTContext::StartTagDeclarationDefinition( 2080 base_class_type)) { 2081 ClangASTContext::CompleteTagDeclarationDefinition( 2082 base_class_type); 2083 } 2084 } 2085 } 2086 } 2087 2088 m_ast.TransferBaseClasses(clang_type.GetOpaqueQualType(), 2089 std::move(bases)); 2090 } 2091 } 2092 } 2093 2094 m_ast.AddMethodOverridesForCXXRecordType(clang_type.GetOpaqueQualType()); 2095 ClangASTContext::BuildIndirectFields(clang_type); 2096 ClangASTContext::CompleteTagDeclarationDefinition(clang_type); 2097 2098 if (!layout_info.field_offsets.empty() || !layout_info.base_offsets.empty() || 2099 !layout_info.vbase_offsets.empty()) { 2100 if (type) 2101 layout_info.bit_size = type->GetByteSize().getValueOr(0) * 8; 2102 if (layout_info.bit_size == 0) 2103 layout_info.bit_size = 2104 die.GetAttributeValueAsUnsigned(DW_AT_byte_size, 0) * 8; 2105 2106 clang::CXXRecordDecl *record_decl = 2107 m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType()); 2108 if (record_decl) 2109 GetClangASTImporter().SetRecordLayout(record_decl, layout_info); 2110 } 2111 2112 return (bool)clang_type; 2113 } 2114 2115 bool DWARFASTParserClang::CompleteEnumType(const DWARFDIE &die, 2116 lldb_private::Type *type, 2117 CompilerType &clang_type) { 2118 if (ClangASTContext::StartTagDeclarationDefinition(clang_type)) { 2119 if (die.HasChildren()) { 2120 bool is_signed = false; 2121 clang_type.IsIntegerType(is_signed); 2122 ParseChildEnumerators(clang_type, is_signed, 2123 type->GetByteSize().getValueOr(0), die); 2124 } 2125 ClangASTContext::CompleteTagDeclarationDefinition(clang_type); 2126 } 2127 return (bool)clang_type; 2128 } 2129 2130 bool DWARFASTParserClang::CompleteTypeFromDWARF(const DWARFDIE &die, 2131 lldb_private::Type *type, 2132 CompilerType &clang_type) { 2133 SymbolFileDWARF *dwarf = die.GetDWARF(); 2134 2135 std::lock_guard<std::recursive_mutex> guard( 2136 dwarf->GetObjectFile()->GetModule()->GetMutex()); 2137 2138 // Disable external storage for this type so we don't get anymore 2139 // clang::ExternalASTSource queries for this type. 2140 m_ast.SetHasExternalStorage(clang_type.GetOpaqueQualType(), false); 2141 2142 if (!die) 2143 return false; 2144 2145 const dw_tag_t tag = die.Tag(); 2146 2147 Log *log = 2148 nullptr; // (LogChannelDWARF::GetLogIfAny(DWARF_LOG_DEBUG_INFO|DWARF_LOG_TYPE_COMPLETION)); 2149 if (log) 2150 dwarf->GetObjectFile()->GetModule()->LogMessageVerboseBacktrace( 2151 log, "0x%8.8" PRIx64 ": %s '%s' resolving forward declaration...", 2152 die.GetID(), die.GetTagAsCString(), type->GetName().AsCString()); 2153 assert(clang_type); 2154 DWARFAttributes attributes; 2155 switch (tag) { 2156 case DW_TAG_structure_type: 2157 case DW_TAG_union_type: 2158 case DW_TAG_class_type: 2159 return CompleteRecordType(die, type, clang_type); 2160 case DW_TAG_enumeration_type: 2161 return CompleteEnumType(die, type, clang_type); 2162 default: 2163 assert(false && "not a forward clang type decl!"); 2164 break; 2165 } 2166 2167 return false; 2168 } 2169 2170 void DWARFASTParserClang::EnsureAllDIEsInDeclContextHaveBeenParsed( 2171 lldb_private::CompilerDeclContext decl_context) { 2172 auto opaque_decl_ctx = 2173 (clang::DeclContext *)decl_context.GetOpaqueDeclContext(); 2174 for (auto it = m_decl_ctx_to_die.find(opaque_decl_ctx); 2175 it != m_decl_ctx_to_die.end() && it->first == opaque_decl_ctx; 2176 it = m_decl_ctx_to_die.erase(it)) 2177 for (DWARFDIE decl = it->second.GetFirstChild(); decl; 2178 decl = decl.GetSibling()) 2179 GetClangDeclForDIE(decl); 2180 } 2181 2182 CompilerDecl DWARFASTParserClang::GetDeclForUIDFromDWARF(const DWARFDIE &die) { 2183 clang::Decl *clang_decl = GetClangDeclForDIE(die); 2184 if (clang_decl != nullptr) 2185 return CompilerDecl(&m_ast, clang_decl); 2186 return CompilerDecl(); 2187 } 2188 2189 CompilerDeclContext 2190 DWARFASTParserClang::GetDeclContextForUIDFromDWARF(const DWARFDIE &die) { 2191 clang::DeclContext *clang_decl_ctx = GetClangDeclContextForDIE(die); 2192 if (clang_decl_ctx) 2193 return m_ast.CreateDeclContext(clang_decl_ctx); 2194 return CompilerDeclContext(); 2195 } 2196 2197 CompilerDeclContext 2198 DWARFASTParserClang::GetDeclContextContainingUIDFromDWARF(const DWARFDIE &die) { 2199 clang::DeclContext *clang_decl_ctx = 2200 GetClangDeclContextContainingDIE(die, nullptr); 2201 if (clang_decl_ctx) 2202 return m_ast.CreateDeclContext(clang_decl_ctx); 2203 return CompilerDeclContext(); 2204 } 2205 2206 size_t DWARFASTParserClang::ParseChildEnumerators( 2207 lldb_private::CompilerType &clang_type, bool is_signed, 2208 uint32_t enumerator_byte_size, const DWARFDIE &parent_die) { 2209 if (!parent_die) 2210 return 0; 2211 2212 size_t enumerators_added = 0; 2213 2214 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 2215 die = die.GetSibling()) { 2216 const dw_tag_t tag = die.Tag(); 2217 if (tag == DW_TAG_enumerator) { 2218 DWARFAttributes attributes; 2219 const size_t num_child_attributes = die.GetAttributes(attributes); 2220 if (num_child_attributes > 0) { 2221 const char *name = nullptr; 2222 bool got_value = false; 2223 int64_t enum_value = 0; 2224 Declaration decl; 2225 2226 uint32_t i; 2227 for (i = 0; i < num_child_attributes; ++i) { 2228 const dw_attr_t attr = attributes.AttributeAtIndex(i); 2229 DWARFFormValue form_value; 2230 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 2231 switch (attr) { 2232 case DW_AT_const_value: 2233 got_value = true; 2234 if (is_signed) 2235 enum_value = form_value.Signed(); 2236 else 2237 enum_value = form_value.Unsigned(); 2238 break; 2239 2240 case DW_AT_name: 2241 name = form_value.AsCString(); 2242 break; 2243 2244 case DW_AT_description: 2245 default: 2246 case DW_AT_decl_file: 2247 decl.SetFile(die.GetCU()->GetFile(form_value.Unsigned())); 2248 break; 2249 case DW_AT_decl_line: 2250 decl.SetLine(form_value.Unsigned()); 2251 break; 2252 case DW_AT_decl_column: 2253 decl.SetColumn(form_value.Unsigned()); 2254 break; 2255 case DW_AT_sibling: 2256 break; 2257 } 2258 } 2259 } 2260 2261 if (name && name[0] && got_value) { 2262 m_ast.AddEnumerationValueToEnumerationType( 2263 clang_type, decl, name, enum_value, enumerator_byte_size * 8); 2264 ++enumerators_added; 2265 } 2266 } 2267 } 2268 } 2269 return enumerators_added; 2270 } 2271 2272 Function *DWARFASTParserClang::ParseFunctionFromDWARF(CompileUnit &comp_unit, 2273 const DWARFDIE &die) { 2274 DWARFRangeList func_ranges; 2275 const char *name = nullptr; 2276 const char *mangled = nullptr; 2277 int decl_file = 0; 2278 int decl_line = 0; 2279 int decl_column = 0; 2280 int call_file = 0; 2281 int call_line = 0; 2282 int call_column = 0; 2283 DWARFExpression frame_base; 2284 2285 const dw_tag_t tag = die.Tag(); 2286 2287 if (tag != DW_TAG_subprogram) 2288 return nullptr; 2289 2290 if (die.GetDIENamesAndRanges(name, mangled, func_ranges, decl_file, decl_line, 2291 decl_column, call_file, call_line, call_column, 2292 &frame_base)) { 2293 2294 // Union of all ranges in the function DIE (if the function is 2295 // discontiguous) 2296 AddressRange func_range; 2297 lldb::addr_t lowest_func_addr = func_ranges.GetMinRangeBase(0); 2298 lldb::addr_t highest_func_addr = func_ranges.GetMaxRangeEnd(0); 2299 if (lowest_func_addr != LLDB_INVALID_ADDRESS && 2300 lowest_func_addr <= highest_func_addr) { 2301 ModuleSP module_sp(die.GetModule()); 2302 func_range.GetBaseAddress().ResolveAddressUsingFileSections( 2303 lowest_func_addr, module_sp->GetSectionList()); 2304 if (func_range.GetBaseAddress().IsValid()) 2305 func_range.SetByteSize(highest_func_addr - lowest_func_addr); 2306 } 2307 2308 if (func_range.GetBaseAddress().IsValid()) { 2309 Mangled func_name; 2310 if (mangled) 2311 func_name.SetValue(ConstString(mangled), true); 2312 else if ((die.GetParent().Tag() == DW_TAG_compile_unit || 2313 die.GetParent().Tag() == DW_TAG_partial_unit) && 2314 Language::LanguageIsCPlusPlus(die.GetLanguage()) && 2315 !Language::LanguageIsObjC(die.GetLanguage()) && name && 2316 strcmp(name, "main") != 0) { 2317 // If the mangled name is not present in the DWARF, generate the 2318 // demangled name using the decl context. We skip if the function is 2319 // "main" as its name is never mangled. 2320 bool is_static = false; 2321 bool is_variadic = false; 2322 bool has_template_params = false; 2323 unsigned type_quals = 0; 2324 std::vector<CompilerType> param_types; 2325 std::vector<clang::ParmVarDecl *> param_decls; 2326 DWARFDeclContext decl_ctx; 2327 StreamString sstr; 2328 2329 die.GetDWARFDeclContext(decl_ctx); 2330 sstr << decl_ctx.GetQualifiedName(); 2331 2332 clang::DeclContext *containing_decl_ctx = 2333 GetClangDeclContextContainingDIE(die, nullptr); 2334 ParseChildParameters(containing_decl_ctx, die, true, is_static, 2335 is_variadic, has_template_params, param_types, 2336 param_decls, type_quals); 2337 sstr << "("; 2338 for (size_t i = 0; i < param_types.size(); i++) { 2339 if (i > 0) 2340 sstr << ", "; 2341 sstr << param_types[i].GetTypeName(); 2342 } 2343 if (is_variadic) 2344 sstr << ", ..."; 2345 sstr << ")"; 2346 if (type_quals & clang::Qualifiers::Const) 2347 sstr << " const"; 2348 2349 func_name.SetValue(ConstString(sstr.GetString()), false); 2350 } else 2351 func_name.SetValue(ConstString(name), false); 2352 2353 FunctionSP func_sp; 2354 std::unique_ptr<Declaration> decl_up; 2355 if (decl_file != 0 || decl_line != 0 || decl_column != 0) 2356 decl_up.reset(new Declaration(die.GetCU()->GetFile(decl_file), 2357 decl_line, decl_column)); 2358 2359 SymbolFileDWARF *dwarf = die.GetDWARF(); 2360 // Supply the type _only_ if it has already been parsed 2361 Type *func_type = dwarf->GetDIEToType().lookup(die.GetDIE()); 2362 2363 assert(func_type == nullptr || func_type != DIE_IS_BEING_PARSED); 2364 2365 if (dwarf->FixupAddress(func_range.GetBaseAddress())) { 2366 const user_id_t func_user_id = die.GetID(); 2367 func_sp = 2368 std::make_shared<Function>(&comp_unit, 2369 func_user_id, // UserID is the DIE offset 2370 func_user_id, func_name, func_type, 2371 func_range); // first address range 2372 2373 if (func_sp.get() != nullptr) { 2374 if (frame_base.IsValid()) 2375 func_sp->GetFrameBaseExpression() = frame_base; 2376 comp_unit.AddFunction(func_sp); 2377 return func_sp.get(); 2378 } 2379 } 2380 } 2381 } 2382 return nullptr; 2383 } 2384 2385 void DWARFASTParserClang::ParseSingleMember( 2386 const DWARFDIE &die, const DWARFDIE &parent_die, 2387 lldb_private::CompilerType &class_clang_type, 2388 const lldb::LanguageType class_language, 2389 std::vector<int> &member_accessibilities, 2390 lldb::AccessType &default_accessibility, 2391 DelayedPropertyList &delayed_properties, 2392 lldb_private::ClangASTImporter::LayoutInfo &layout_info, 2393 FieldInfo &last_field_info) { 2394 ModuleSP module_sp = parent_die.GetDWARF()->GetObjectFile()->GetModule(); 2395 const dw_tag_t tag = die.Tag(); 2396 // Get the parent byte size so we can verify any members will fit 2397 const uint64_t parent_byte_size = 2398 parent_die.GetAttributeValueAsUnsigned(DW_AT_byte_size, UINT64_MAX); 2399 const uint64_t parent_bit_size = 2400 parent_byte_size == UINT64_MAX ? UINT64_MAX : parent_byte_size * 8; 2401 2402 DWARFAttributes attributes; 2403 const size_t num_attributes = die.GetAttributes(attributes); 2404 if (num_attributes > 0) { 2405 const char *name = nullptr; 2406 const char *prop_name = nullptr; 2407 const char *prop_getter_name = nullptr; 2408 const char *prop_setter_name = nullptr; 2409 uint32_t prop_attributes = 0; 2410 2411 bool is_artificial = false; 2412 DWARFFormValue encoding_form; 2413 AccessType accessibility = eAccessNone; 2414 uint32_t member_byte_offset = 2415 (parent_die.Tag() == DW_TAG_union_type) ? 0 : UINT32_MAX; 2416 llvm::Optional<uint64_t> byte_size; 2417 int64_t bit_offset = 0; 2418 uint64_t data_bit_offset = UINT64_MAX; 2419 size_t bit_size = 0; 2420 bool is_external = 2421 false; // On DW_TAG_members, this means the member is static 2422 uint32_t i; 2423 for (i = 0; i < num_attributes && !is_artificial; ++i) { 2424 const dw_attr_t attr = attributes.AttributeAtIndex(i); 2425 DWARFFormValue form_value; 2426 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 2427 // DW_AT_data_member_location indicates the byte offset of the 2428 // word from the base address of the structure. 2429 // 2430 // DW_AT_bit_offset indicates how many bits into the word 2431 // (according to the host endianness) the low-order bit of the 2432 // field starts. AT_bit_offset can be negative. 2433 // 2434 // DW_AT_bit_size indicates the size of the field in bits. 2435 switch (attr) { 2436 case DW_AT_name: 2437 name = form_value.AsCString(); 2438 break; 2439 case DW_AT_type: 2440 encoding_form = form_value; 2441 break; 2442 case DW_AT_bit_offset: 2443 bit_offset = form_value.Signed(); 2444 break; 2445 case DW_AT_bit_size: 2446 bit_size = form_value.Unsigned(); 2447 break; 2448 case DW_AT_byte_size: 2449 byte_size = form_value.Unsigned(); 2450 break; 2451 case DW_AT_data_bit_offset: 2452 data_bit_offset = form_value.Unsigned(); 2453 break; 2454 case DW_AT_data_member_location: 2455 if (form_value.BlockData()) { 2456 Value initialValue(0); 2457 Value memberOffset(0); 2458 const DWARFDataExtractor &debug_info_data = die.GetData(); 2459 uint32_t block_length = form_value.Unsigned(); 2460 uint32_t block_offset = 2461 form_value.BlockData() - debug_info_data.GetDataStart(); 2462 if (DWARFExpression::Evaluate( 2463 nullptr, // ExecutionContext * 2464 nullptr, // RegisterContext * 2465 module_sp, 2466 DataExtractor(debug_info_data, block_offset, block_length), 2467 die.GetCU(), eRegisterKindDWARF, &initialValue, nullptr, 2468 memberOffset, nullptr)) { 2469 member_byte_offset = memberOffset.ResolveValue(nullptr).UInt(); 2470 } 2471 } else { 2472 // With DWARF 3 and later, if the value is an integer constant, 2473 // this form value is the offset in bytes from the beginning of 2474 // the containing entity. 2475 member_byte_offset = form_value.Unsigned(); 2476 } 2477 break; 2478 2479 case DW_AT_accessibility: 2480 accessibility = DW_ACCESS_to_AccessType(form_value.Unsigned()); 2481 break; 2482 case DW_AT_artificial: 2483 is_artificial = form_value.Boolean(); 2484 break; 2485 case DW_AT_APPLE_property_name: 2486 prop_name = form_value.AsCString(); 2487 break; 2488 case DW_AT_APPLE_property_getter: 2489 prop_getter_name = form_value.AsCString(); 2490 break; 2491 case DW_AT_APPLE_property_setter: 2492 prop_setter_name = form_value.AsCString(); 2493 break; 2494 case DW_AT_APPLE_property_attribute: 2495 prop_attributes = form_value.Unsigned(); 2496 break; 2497 case DW_AT_external: 2498 is_external = form_value.Boolean(); 2499 break; 2500 2501 default: 2502 case DW_AT_declaration: 2503 case DW_AT_description: 2504 case DW_AT_mutable: 2505 case DW_AT_visibility: 2506 case DW_AT_sibling: 2507 break; 2508 } 2509 } 2510 } 2511 2512 if (prop_name) { 2513 ConstString fixed_setter; 2514 2515 // Check if the property getter/setter were provided as full names. 2516 // We want basenames, so we extract them. 2517 2518 if (prop_getter_name && prop_getter_name[0] == '-') { 2519 ObjCLanguage::MethodName prop_getter_method(prop_getter_name, true); 2520 prop_getter_name = prop_getter_method.GetSelector().GetCString(); 2521 } 2522 2523 if (prop_setter_name && prop_setter_name[0] == '-') { 2524 ObjCLanguage::MethodName prop_setter_method(prop_setter_name, true); 2525 prop_setter_name = prop_setter_method.GetSelector().GetCString(); 2526 } 2527 2528 // If the names haven't been provided, they need to be filled in. 2529 2530 if (!prop_getter_name) { 2531 prop_getter_name = prop_name; 2532 } 2533 if (!prop_setter_name && prop_name[0] && 2534 !(prop_attributes & DW_APPLE_PROPERTY_readonly)) { 2535 StreamString ss; 2536 2537 ss.Printf("set%c%s:", toupper(prop_name[0]), &prop_name[1]); 2538 2539 fixed_setter.SetString(ss.GetString()); 2540 prop_setter_name = fixed_setter.GetCString(); 2541 } 2542 } 2543 2544 // Clang has a DWARF generation bug where sometimes it represents 2545 // fields that are references with bad byte size and bit size/offset 2546 // information such as: 2547 // 2548 // DW_AT_byte_size( 0x00 ) 2549 // DW_AT_bit_size( 0x40 ) 2550 // DW_AT_bit_offset( 0xffffffffffffffc0 ) 2551 // 2552 // So check the bit offset to make sure it is sane, and if the values 2553 // are not sane, remove them. If we don't do this then we will end up 2554 // with a crash if we try to use this type in an expression when clang 2555 // becomes unhappy with its recycled debug info. 2556 2557 if (byte_size.getValueOr(0) == 0 && bit_offset < 0) { 2558 bit_size = 0; 2559 bit_offset = 0; 2560 } 2561 2562 // FIXME: Make Clang ignore Objective-C accessibility for expressions 2563 if (class_language == eLanguageTypeObjC || 2564 class_language == eLanguageTypeObjC_plus_plus) 2565 accessibility = eAccessNone; 2566 2567 // Handle static members 2568 if (is_external && member_byte_offset == UINT32_MAX) { 2569 Type *var_type = die.ResolveTypeUID(encoding_form.Reference()); 2570 2571 if (var_type) { 2572 if (accessibility == eAccessNone) 2573 accessibility = eAccessPublic; 2574 ClangASTContext::AddVariableToRecordType( 2575 class_clang_type, name, var_type->GetLayoutCompilerType(), 2576 accessibility); 2577 } 2578 return; 2579 } 2580 2581 if (!is_artificial) { 2582 Type *member_type = die.ResolveTypeUID(encoding_form.Reference()); 2583 2584 clang::FieldDecl *field_decl = nullptr; 2585 const uint64_t character_width = 8; 2586 const uint64_t word_width = 32; 2587 if (tag == DW_TAG_member) { 2588 if (member_type) { 2589 CompilerType member_clang_type = member_type->GetLayoutCompilerType(); 2590 2591 if (accessibility == eAccessNone) 2592 accessibility = default_accessibility; 2593 member_accessibilities.push_back(accessibility); 2594 2595 uint64_t field_bit_offset = 2596 (member_byte_offset == UINT32_MAX ? 0 : (member_byte_offset * 8)); 2597 2598 if (bit_size > 0) { 2599 FieldInfo this_field_info; 2600 this_field_info.bit_offset = field_bit_offset; 2601 this_field_info.bit_size = bit_size; 2602 2603 if (data_bit_offset != UINT64_MAX) { 2604 this_field_info.bit_offset = data_bit_offset; 2605 } else { 2606 if (!byte_size) 2607 byte_size = member_type->GetByteSize(); 2608 2609 ObjectFile *objfile = die.GetDWARF()->GetObjectFile(); 2610 if (objfile->GetByteOrder() == eByteOrderLittle) { 2611 this_field_info.bit_offset += byte_size.getValueOr(0) * 8; 2612 this_field_info.bit_offset -= (bit_offset + bit_size); 2613 } else { 2614 this_field_info.bit_offset += bit_offset; 2615 } 2616 } 2617 2618 if ((this_field_info.bit_offset >= parent_bit_size) || 2619 (last_field_info.IsBitfield() && 2620 !last_field_info.NextBitfieldOffsetIsValid( 2621 this_field_info.bit_offset))) { 2622 ObjectFile *objfile = die.GetDWARF()->GetObjectFile(); 2623 objfile->GetModule()->ReportWarning( 2624 "0x%8.8" PRIx64 ": %s bitfield named \"%s\" has invalid " 2625 "bit offset (0x%8.8" PRIx64 2626 ") member will be ignored. Please file a bug against the " 2627 "compiler and include the preprocessed output for %s\n", 2628 die.GetID(), DW_TAG_value_to_name(tag), name, 2629 this_field_info.bit_offset, GetUnitName(parent_die).c_str()); 2630 return; 2631 } 2632 2633 // Update the field bit offset we will report for layout 2634 field_bit_offset = this_field_info.bit_offset; 2635 2636 // Objective-C has invalid DW_AT_bit_offset values in older 2637 // versions of clang, so we have to be careful and only insert 2638 // unnamed bitfields if we have a new enough clang. 2639 bool detect_unnamed_bitfields = true; 2640 2641 if (class_language == eLanguageTypeObjC || 2642 class_language == eLanguageTypeObjC_plus_plus) 2643 detect_unnamed_bitfields = 2644 die.GetCU()->Supports_unnamed_objc_bitfields(); 2645 2646 if (detect_unnamed_bitfields) { 2647 clang::Optional<FieldInfo> unnamed_field_info; 2648 uint64_t last_field_end = 0; 2649 2650 last_field_end = 2651 last_field_info.bit_offset + last_field_info.bit_size; 2652 2653 if (!last_field_info.IsBitfield()) { 2654 // The last field was not a bit-field... 2655 // but if it did take up the entire word then we need to extend 2656 // last_field_end so the bit-field does not step into the last 2657 // fields padding. 2658 if (last_field_end != 0 && ((last_field_end % word_width) != 0)) 2659 last_field_end += word_width - (last_field_end % word_width); 2660 } 2661 2662 // If we have a gap between the last_field_end and the current 2663 // field we have an unnamed bit-field 2664 if (this_field_info.bit_offset != last_field_end && 2665 !(this_field_info.bit_offset < last_field_end)) { 2666 unnamed_field_info = FieldInfo{}; 2667 unnamed_field_info->bit_size = 2668 this_field_info.bit_offset - last_field_end; 2669 unnamed_field_info->bit_offset = last_field_end; 2670 } 2671 2672 if (unnamed_field_info) { 2673 clang::FieldDecl *unnamed_bitfield_decl = 2674 ClangASTContext::AddFieldToRecordType( 2675 class_clang_type, llvm::StringRef(), 2676 m_ast.GetBuiltinTypeForEncodingAndBitSize(eEncodingSint, 2677 word_width), 2678 accessibility, unnamed_field_info->bit_size); 2679 2680 layout_info.field_offsets.insert(std::make_pair( 2681 unnamed_bitfield_decl, unnamed_field_info->bit_offset)); 2682 } 2683 } 2684 2685 last_field_info = this_field_info; 2686 last_field_info.SetIsBitfield(true); 2687 } else { 2688 last_field_info.bit_offset = field_bit_offset; 2689 2690 if (llvm::Optional<uint64_t> clang_type_size = 2691 member_clang_type.GetByteSize(nullptr)) { 2692 last_field_info.bit_size = *clang_type_size * character_width; 2693 } 2694 2695 last_field_info.SetIsBitfield(false); 2696 } 2697 2698 if (!member_clang_type.IsCompleteType()) 2699 member_clang_type.GetCompleteType(); 2700 2701 { 2702 // Older versions of clang emit array[0] and array[1] in the 2703 // same way (<rdar://problem/12566646>). If the current field 2704 // is at the end of the structure, then there is definitely no 2705 // room for extra elements and we override the type to 2706 // array[0]. 2707 2708 CompilerType member_array_element_type; 2709 uint64_t member_array_size; 2710 bool member_array_is_incomplete; 2711 2712 if (member_clang_type.IsArrayType(&member_array_element_type, 2713 &member_array_size, 2714 &member_array_is_incomplete) && 2715 !member_array_is_incomplete) { 2716 uint64_t parent_byte_size = 2717 parent_die.GetAttributeValueAsUnsigned(DW_AT_byte_size, 2718 UINT64_MAX); 2719 2720 if (member_byte_offset >= parent_byte_size) { 2721 if (member_array_size != 1 && 2722 (member_array_size != 0 || 2723 member_byte_offset > parent_byte_size)) { 2724 module_sp->ReportError( 2725 "0x%8.8" PRIx64 2726 ": DW_TAG_member '%s' refers to type 0x%8.8x" 2727 " which extends beyond the bounds of 0x%8.8" PRIx64, 2728 die.GetID(), name, encoding_form.Reference().GetOffset(), 2729 parent_die.GetID()); 2730 } 2731 2732 member_clang_type = 2733 m_ast.CreateArrayType(member_array_element_type, 0, false); 2734 } 2735 } 2736 } 2737 2738 if (ClangASTContext::IsCXXClassType(member_clang_type) && 2739 !member_clang_type.GetCompleteType()) { 2740 if (die.GetCU()->GetProducer() == eProducerClang) 2741 module_sp->ReportError( 2742 "DWARF DIE at 0x%8.8x (class %s) has a member variable " 2743 "0x%8.8x (%s) whose type is a forward declaration, not a " 2744 "complete definition.\nTry compiling the source file " 2745 "with -fstandalone-debug", 2746 parent_die.GetOffset(), parent_die.GetName(), die.GetOffset(), 2747 name); 2748 else 2749 module_sp->ReportError( 2750 "DWARF DIE at 0x%8.8x (class %s) has a member variable " 2751 "0x%8.8x (%s) whose type is a forward declaration, not a " 2752 "complete definition.\nPlease file a bug against the " 2753 "compiler and include the preprocessed output for %s", 2754 parent_die.GetOffset(), parent_die.GetName(), die.GetOffset(), 2755 name, GetUnitName(parent_die).c_str()); 2756 // We have no choice other than to pretend that the member 2757 // class is complete. If we don't do this, clang will crash 2758 // when trying to layout the class. Since we provide layout 2759 // assistance, all ivars in this class and other classes will 2760 // be fine, this is the best we can do short of crashing. 2761 if (ClangASTContext::StartTagDeclarationDefinition( 2762 member_clang_type)) { 2763 ClangASTContext::CompleteTagDeclarationDefinition( 2764 member_clang_type); 2765 } else { 2766 module_sp->ReportError( 2767 "DWARF DIE at 0x%8.8x (class %s) has a member variable " 2768 "0x%8.8x (%s) whose type claims to be a C++ class but we " 2769 "were not able to start its definition.\nPlease file a " 2770 "bug and attach the file at the start of this error " 2771 "message", 2772 parent_die.GetOffset(), parent_die.GetName(), die.GetOffset(), 2773 name); 2774 } 2775 } 2776 2777 field_decl = ClangASTContext::AddFieldToRecordType( 2778 class_clang_type, name, member_clang_type, accessibility, 2779 bit_size); 2780 2781 m_ast.SetMetadataAsUserID(field_decl, die.GetID()); 2782 2783 layout_info.field_offsets.insert( 2784 std::make_pair(field_decl, field_bit_offset)); 2785 } else { 2786 if (name) 2787 module_sp->ReportError( 2788 "0x%8.8" PRIx64 ": DW_TAG_member '%s' refers to type 0x%8.8x" 2789 " which was unable to be parsed", 2790 die.GetID(), name, encoding_form.Reference().GetOffset()); 2791 else 2792 module_sp->ReportError( 2793 "0x%8.8" PRIx64 ": DW_TAG_member refers to type 0x%8.8x" 2794 " which was unable to be parsed", 2795 die.GetID(), encoding_form.Reference().GetOffset()); 2796 } 2797 } 2798 2799 if (prop_name != nullptr && member_type) { 2800 clang::ObjCIvarDecl *ivar_decl = nullptr; 2801 2802 if (field_decl) { 2803 ivar_decl = clang::dyn_cast<clang::ObjCIvarDecl>(field_decl); 2804 assert(ivar_decl != nullptr); 2805 } 2806 2807 ClangASTMetadata metadata; 2808 metadata.SetUserID(die.GetID()); 2809 delayed_properties.push_back(DelayedAddObjCClassProperty( 2810 class_clang_type, prop_name, member_type->GetLayoutCompilerType(), 2811 ivar_decl, prop_setter_name, prop_getter_name, prop_attributes, 2812 &metadata)); 2813 2814 if (ivar_decl) 2815 m_ast.SetMetadataAsUserID(ivar_decl, die.GetID()); 2816 } 2817 } 2818 } 2819 } 2820 2821 bool DWARFASTParserClang::ParseChildMembers( 2822 const DWARFDIE &parent_die, CompilerType &class_clang_type, 2823 const LanguageType class_language, 2824 std::vector<std::unique_ptr<clang::CXXBaseSpecifier>> &base_classes, 2825 std::vector<int> &member_accessibilities, 2826 std::vector<DWARFDIE> &member_function_dies, 2827 DelayedPropertyList &delayed_properties, AccessType &default_accessibility, 2828 bool &is_a_class, ClangASTImporter::LayoutInfo &layout_info) { 2829 if (!parent_die) 2830 return false; 2831 2832 FieldInfo last_field_info; 2833 2834 ModuleSP module_sp = parent_die.GetDWARF()->GetObjectFile()->GetModule(); 2835 ClangASTContext *ast = 2836 llvm::dyn_cast_or_null<ClangASTContext>(class_clang_type.GetTypeSystem()); 2837 if (ast == nullptr) 2838 return false; 2839 2840 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 2841 die = die.GetSibling()) { 2842 dw_tag_t tag = die.Tag(); 2843 2844 switch (tag) { 2845 case DW_TAG_member: 2846 case DW_TAG_APPLE_property: 2847 ParseSingleMember(die, parent_die, class_clang_type, class_language, 2848 member_accessibilities, default_accessibility, 2849 delayed_properties, layout_info, last_field_info); 2850 break; 2851 2852 case DW_TAG_subprogram: 2853 // Let the type parsing code handle this one for us. 2854 member_function_dies.push_back(die); 2855 break; 2856 2857 case DW_TAG_inheritance: { 2858 is_a_class = true; 2859 if (default_accessibility == eAccessNone) 2860 default_accessibility = eAccessPrivate; 2861 // TODO: implement DW_TAG_inheritance type parsing 2862 DWARFAttributes attributes; 2863 const size_t num_attributes = die.GetAttributes(attributes); 2864 if (num_attributes > 0) { 2865 DWARFFormValue encoding_form; 2866 AccessType accessibility = default_accessibility; 2867 bool is_virtual = false; 2868 bool is_base_of_class = true; 2869 off_t member_byte_offset = 0; 2870 uint32_t i; 2871 for (i = 0; i < num_attributes; ++i) { 2872 const dw_attr_t attr = attributes.AttributeAtIndex(i); 2873 DWARFFormValue form_value; 2874 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 2875 switch (attr) { 2876 case DW_AT_type: 2877 encoding_form = form_value; 2878 break; 2879 case DW_AT_data_member_location: 2880 if (form_value.BlockData()) { 2881 Value initialValue(0); 2882 Value memberOffset(0); 2883 const DWARFDataExtractor &debug_info_data = die.GetData(); 2884 uint32_t block_length = form_value.Unsigned(); 2885 uint32_t block_offset = 2886 form_value.BlockData() - debug_info_data.GetDataStart(); 2887 if (DWARFExpression::Evaluate( 2888 nullptr, nullptr, module_sp, 2889 DataExtractor(debug_info_data, block_offset, 2890 block_length), 2891 die.GetCU(), eRegisterKindDWARF, &initialValue, nullptr, 2892 memberOffset, nullptr)) { 2893 member_byte_offset = 2894 memberOffset.ResolveValue(nullptr).UInt(); 2895 } 2896 } else { 2897 // With DWARF 3 and later, if the value is an integer constant, 2898 // this form value is the offset in bytes from the beginning of 2899 // the containing entity. 2900 member_byte_offset = form_value.Unsigned(); 2901 } 2902 break; 2903 2904 case DW_AT_accessibility: 2905 accessibility = DW_ACCESS_to_AccessType(form_value.Unsigned()); 2906 break; 2907 2908 case DW_AT_virtuality: 2909 is_virtual = form_value.Boolean(); 2910 break; 2911 2912 case DW_AT_sibling: 2913 break; 2914 2915 default: 2916 break; 2917 } 2918 } 2919 } 2920 2921 Type *base_class_type = die.ResolveTypeUID(encoding_form.Reference()); 2922 if (base_class_type == nullptr) { 2923 module_sp->ReportError("0x%8.8x: DW_TAG_inheritance failed to " 2924 "resolve the base class at 0x%8.8x" 2925 " from enclosing type 0x%8.8x. \nPlease file " 2926 "a bug and attach the file at the start of " 2927 "this error message", 2928 die.GetOffset(), 2929 encoding_form.Reference().GetOffset(), 2930 parent_die.GetOffset()); 2931 break; 2932 } 2933 2934 CompilerType base_class_clang_type = 2935 base_class_type->GetFullCompilerType(); 2936 assert(base_class_clang_type); 2937 if (class_language == eLanguageTypeObjC) { 2938 ast->SetObjCSuperClass(class_clang_type, base_class_clang_type); 2939 } else { 2940 std::unique_ptr<clang::CXXBaseSpecifier> result = 2941 ast->CreateBaseClassSpecifier( 2942 base_class_clang_type.GetOpaqueQualType(), accessibility, 2943 is_virtual, is_base_of_class); 2944 if (!result) 2945 break; 2946 2947 base_classes.push_back(std::move(result)); 2948 2949 if (is_virtual) { 2950 // Do not specify any offset for virtual inheritance. The DWARF 2951 // produced by clang doesn't give us a constant offset, but gives 2952 // us a DWARF expressions that requires an actual object in memory. 2953 // the DW_AT_data_member_location for a virtual base class looks 2954 // like: 2955 // DW_AT_data_member_location( DW_OP_dup, DW_OP_deref, 2956 // DW_OP_constu(0x00000018), DW_OP_minus, DW_OP_deref, 2957 // DW_OP_plus ) 2958 // Given this, there is really no valid response we can give to 2959 // clang for virtual base class offsets, and this should eventually 2960 // be removed from LayoutRecordType() in the external 2961 // AST source in clang. 2962 } else { 2963 layout_info.base_offsets.insert(std::make_pair( 2964 ast->GetAsCXXRecordDecl( 2965 base_class_clang_type.GetOpaqueQualType()), 2966 clang::CharUnits::fromQuantity(member_byte_offset))); 2967 } 2968 } 2969 } 2970 } break; 2971 2972 default: 2973 break; 2974 } 2975 } 2976 2977 return true; 2978 } 2979 2980 size_t DWARFASTParserClang::ParseChildParameters( 2981 clang::DeclContext *containing_decl_ctx, const DWARFDIE &parent_die, 2982 bool skip_artificial, bool &is_static, bool &is_variadic, 2983 bool &has_template_params, std::vector<CompilerType> &function_param_types, 2984 std::vector<clang::ParmVarDecl *> &function_param_decls, 2985 unsigned &type_quals) { 2986 if (!parent_die) 2987 return 0; 2988 2989 size_t arg_idx = 0; 2990 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 2991 die = die.GetSibling()) { 2992 const dw_tag_t tag = die.Tag(); 2993 switch (tag) { 2994 case DW_TAG_formal_parameter: { 2995 DWARFAttributes attributes; 2996 const size_t num_attributes = die.GetAttributes(attributes); 2997 if (num_attributes > 0) { 2998 const char *name = nullptr; 2999 DWARFFormValue param_type_die_form; 3000 bool is_artificial = false; 3001 // one of None, Auto, Register, Extern, Static, PrivateExtern 3002 3003 clang::StorageClass storage = clang::SC_None; 3004 uint32_t i; 3005 for (i = 0; i < num_attributes; ++i) { 3006 const dw_attr_t attr = attributes.AttributeAtIndex(i); 3007 DWARFFormValue form_value; 3008 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 3009 switch (attr) { 3010 case DW_AT_name: 3011 name = form_value.AsCString(); 3012 break; 3013 case DW_AT_type: 3014 param_type_die_form = form_value; 3015 break; 3016 case DW_AT_artificial: 3017 is_artificial = form_value.Boolean(); 3018 break; 3019 case DW_AT_location: 3020 case DW_AT_const_value: 3021 case DW_AT_default_value: 3022 case DW_AT_description: 3023 case DW_AT_endianity: 3024 case DW_AT_is_optional: 3025 case DW_AT_segment: 3026 case DW_AT_variable_parameter: 3027 default: 3028 case DW_AT_abstract_origin: 3029 case DW_AT_sibling: 3030 break; 3031 } 3032 } 3033 } 3034 3035 bool skip = false; 3036 if (skip_artificial && is_artificial) { 3037 // In order to determine if a C++ member function is "const" we 3038 // have to look at the const-ness of "this"... 3039 if (arg_idx == 0 && 3040 DeclKindIsCXXClass(containing_decl_ctx->getDeclKind()) && 3041 // Often times compilers omit the "this" name for the 3042 // specification DIEs, so we can't rely upon the name being in 3043 // the formal parameter DIE... 3044 (name == nullptr || ::strcmp(name, "this") == 0)) { 3045 Type *this_type = 3046 die.ResolveTypeUID(param_type_die_form.Reference()); 3047 if (this_type) { 3048 uint32_t encoding_mask = this_type->GetEncodingMask(); 3049 if (encoding_mask & Type::eEncodingIsPointerUID) { 3050 is_static = false; 3051 3052 if (encoding_mask & (1u << Type::eEncodingIsConstUID)) 3053 type_quals |= clang::Qualifiers::Const; 3054 if (encoding_mask & (1u << Type::eEncodingIsVolatileUID)) 3055 type_quals |= clang::Qualifiers::Volatile; 3056 } 3057 } 3058 } 3059 skip = true; 3060 } 3061 3062 if (!skip) { 3063 Type *type = die.ResolveTypeUID(param_type_die_form.Reference()); 3064 if (type) { 3065 function_param_types.push_back(type->GetForwardCompilerType()); 3066 3067 clang::ParmVarDecl *param_var_decl = 3068 m_ast.CreateParameterDeclaration(containing_decl_ctx, name, 3069 type->GetForwardCompilerType(), 3070 storage); 3071 assert(param_var_decl); 3072 function_param_decls.push_back(param_var_decl); 3073 3074 m_ast.SetMetadataAsUserID(param_var_decl, die.GetID()); 3075 } 3076 } 3077 } 3078 arg_idx++; 3079 } break; 3080 3081 case DW_TAG_unspecified_parameters: 3082 is_variadic = true; 3083 break; 3084 3085 case DW_TAG_template_type_parameter: 3086 case DW_TAG_template_value_parameter: 3087 case DW_TAG_GNU_template_parameter_pack: 3088 // The one caller of this was never using the template_param_infos, and 3089 // the local variable was taking up a large amount of stack space in 3090 // SymbolFileDWARF::ParseType() so this was removed. If we ever need the 3091 // template params back, we can add them back. 3092 // ParseTemplateDIE (dwarf_cu, die, template_param_infos); 3093 has_template_params = true; 3094 break; 3095 3096 default: 3097 break; 3098 } 3099 } 3100 return arg_idx; 3101 } 3102 3103 llvm::Optional<SymbolFile::ArrayInfo> 3104 DWARFASTParser::ParseChildArrayInfo(const DWARFDIE &parent_die, 3105 const ExecutionContext *exe_ctx) { 3106 SymbolFile::ArrayInfo array_info; 3107 if (!parent_die) 3108 return llvm::None; 3109 3110 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 3111 die = die.GetSibling()) { 3112 const dw_tag_t tag = die.Tag(); 3113 switch (tag) { 3114 case DW_TAG_subrange_type: { 3115 DWARFAttributes attributes; 3116 const size_t num_child_attributes = die.GetAttributes(attributes); 3117 if (num_child_attributes > 0) { 3118 uint64_t num_elements = 0; 3119 uint64_t lower_bound = 0; 3120 uint64_t upper_bound = 0; 3121 bool upper_bound_valid = false; 3122 uint32_t i; 3123 for (i = 0; i < num_child_attributes; ++i) { 3124 const dw_attr_t attr = attributes.AttributeAtIndex(i); 3125 DWARFFormValue form_value; 3126 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 3127 switch (attr) { 3128 case DW_AT_name: 3129 break; 3130 3131 case DW_AT_count: 3132 if (DWARFDIE var_die = die.GetReferencedDIE(DW_AT_count)) { 3133 if (var_die.Tag() == DW_TAG_variable) 3134 if (exe_ctx) { 3135 if (auto frame = exe_ctx->GetFrameSP()) { 3136 Status error; 3137 lldb::VariableSP var_sp; 3138 auto valobj_sp = frame->GetValueForVariableExpressionPath( 3139 var_die.GetName(), eNoDynamicValues, 0, var_sp, 3140 error); 3141 if (valobj_sp) { 3142 num_elements = valobj_sp->GetValueAsUnsigned(0); 3143 break; 3144 } 3145 } 3146 } 3147 } else 3148 num_elements = form_value.Unsigned(); 3149 break; 3150 3151 case DW_AT_bit_stride: 3152 array_info.bit_stride = form_value.Unsigned(); 3153 break; 3154 3155 case DW_AT_byte_stride: 3156 array_info.byte_stride = form_value.Unsigned(); 3157 break; 3158 3159 case DW_AT_lower_bound: 3160 lower_bound = form_value.Unsigned(); 3161 break; 3162 3163 case DW_AT_upper_bound: 3164 upper_bound_valid = true; 3165 upper_bound = form_value.Unsigned(); 3166 break; 3167 3168 default: 3169 case DW_AT_abstract_origin: 3170 case DW_AT_accessibility: 3171 case DW_AT_allocated: 3172 case DW_AT_associated: 3173 case DW_AT_data_location: 3174 case DW_AT_declaration: 3175 case DW_AT_description: 3176 case DW_AT_sibling: 3177 case DW_AT_threads_scaled: 3178 case DW_AT_type: 3179 case DW_AT_visibility: 3180 break; 3181 } 3182 } 3183 } 3184 3185 if (num_elements == 0) { 3186 if (upper_bound_valid && upper_bound >= lower_bound) 3187 num_elements = upper_bound - lower_bound + 1; 3188 } 3189 3190 array_info.element_orders.push_back(num_elements); 3191 } 3192 } break; 3193 default: 3194 break; 3195 } 3196 } 3197 return array_info; 3198 } 3199 3200 Type *DWARFASTParserClang::GetTypeForDIE(const DWARFDIE &die) { 3201 if (die) { 3202 SymbolFileDWARF *dwarf = die.GetDWARF(); 3203 DWARFAttributes attributes; 3204 const size_t num_attributes = die.GetAttributes(attributes); 3205 if (num_attributes > 0) { 3206 DWARFFormValue type_die_form; 3207 for (size_t i = 0; i < num_attributes; ++i) { 3208 dw_attr_t attr = attributes.AttributeAtIndex(i); 3209 DWARFFormValue form_value; 3210 3211 if (attr == DW_AT_type && 3212 attributes.ExtractFormValueAtIndex(i, form_value)) 3213 return dwarf->ResolveTypeUID(form_value.Reference(), true); 3214 } 3215 } 3216 } 3217 3218 return nullptr; 3219 } 3220 3221 clang::Decl *DWARFASTParserClang::GetClangDeclForDIE(const DWARFDIE &die) { 3222 if (!die) 3223 return nullptr; 3224 3225 switch (die.Tag()) { 3226 case DW_TAG_variable: 3227 case DW_TAG_constant: 3228 case DW_TAG_formal_parameter: 3229 case DW_TAG_imported_declaration: 3230 case DW_TAG_imported_module: 3231 break; 3232 default: 3233 return nullptr; 3234 } 3235 3236 DIEToDeclMap::iterator cache_pos = m_die_to_decl.find(die.GetDIE()); 3237 if (cache_pos != m_die_to_decl.end()) 3238 return cache_pos->second; 3239 3240 if (DWARFDIE spec_die = die.GetReferencedDIE(DW_AT_specification)) { 3241 clang::Decl *decl = GetClangDeclForDIE(spec_die); 3242 m_die_to_decl[die.GetDIE()] = decl; 3243 m_decl_to_die[decl].insert(die.GetDIE()); 3244 return decl; 3245 } 3246 3247 if (DWARFDIE abstract_origin_die = 3248 die.GetReferencedDIE(DW_AT_abstract_origin)) { 3249 clang::Decl *decl = GetClangDeclForDIE(abstract_origin_die); 3250 m_die_to_decl[die.GetDIE()] = decl; 3251 m_decl_to_die[decl].insert(die.GetDIE()); 3252 return decl; 3253 } 3254 3255 clang::Decl *decl = nullptr; 3256 switch (die.Tag()) { 3257 case DW_TAG_variable: 3258 case DW_TAG_constant: 3259 case DW_TAG_formal_parameter: { 3260 SymbolFileDWARF *dwarf = die.GetDWARF(); 3261 Type *type = GetTypeForDIE(die); 3262 if (dwarf && type) { 3263 const char *name = die.GetName(); 3264 clang::DeclContext *decl_context = 3265 ClangASTContext::DeclContextGetAsDeclContext( 3266 dwarf->GetDeclContextContainingUID(die.GetID())); 3267 decl = m_ast.CreateVariableDeclaration( 3268 decl_context, name, 3269 ClangUtil::GetQualType(type->GetForwardCompilerType())); 3270 } 3271 break; 3272 } 3273 case DW_TAG_imported_declaration: { 3274 SymbolFileDWARF *dwarf = die.GetDWARF(); 3275 DWARFDIE imported_uid = die.GetAttributeValueAsReferenceDIE(DW_AT_import); 3276 if (imported_uid) { 3277 CompilerDecl imported_decl = imported_uid.GetDecl(); 3278 if (imported_decl) { 3279 clang::DeclContext *decl_context = 3280 ClangASTContext::DeclContextGetAsDeclContext( 3281 dwarf->GetDeclContextContainingUID(die.GetID())); 3282 if (clang::NamedDecl *clang_imported_decl = 3283 llvm::dyn_cast<clang::NamedDecl>( 3284 (clang::Decl *)imported_decl.GetOpaqueDecl())) 3285 decl = 3286 m_ast.CreateUsingDeclaration(decl_context, clang_imported_decl); 3287 } 3288 } 3289 break; 3290 } 3291 case DW_TAG_imported_module: { 3292 SymbolFileDWARF *dwarf = die.GetDWARF(); 3293 DWARFDIE imported_uid = die.GetAttributeValueAsReferenceDIE(DW_AT_import); 3294 3295 if (imported_uid) { 3296 CompilerDeclContext imported_decl_ctx = imported_uid.GetDeclContext(); 3297 if (imported_decl_ctx) { 3298 clang::DeclContext *decl_context = 3299 ClangASTContext::DeclContextGetAsDeclContext( 3300 dwarf->GetDeclContextContainingUID(die.GetID())); 3301 if (clang::NamespaceDecl *ns_decl = 3302 ClangASTContext::DeclContextGetAsNamespaceDecl( 3303 imported_decl_ctx)) 3304 decl = m_ast.CreateUsingDirectiveDeclaration(decl_context, ns_decl); 3305 } 3306 } 3307 break; 3308 } 3309 default: 3310 break; 3311 } 3312 3313 m_die_to_decl[die.GetDIE()] = decl; 3314 m_decl_to_die[decl].insert(die.GetDIE()); 3315 3316 return decl; 3317 } 3318 3319 clang::DeclContext * 3320 DWARFASTParserClang::GetClangDeclContextForDIE(const DWARFDIE &die) { 3321 if (die) { 3322 clang::DeclContext *decl_ctx = GetCachedClangDeclContextForDIE(die); 3323 if (decl_ctx) 3324 return decl_ctx; 3325 3326 bool try_parsing_type = true; 3327 switch (die.Tag()) { 3328 case DW_TAG_compile_unit: 3329 case DW_TAG_partial_unit: 3330 decl_ctx = m_ast.GetTranslationUnitDecl(); 3331 try_parsing_type = false; 3332 break; 3333 3334 case DW_TAG_namespace: 3335 decl_ctx = ResolveNamespaceDIE(die); 3336 try_parsing_type = false; 3337 break; 3338 3339 case DW_TAG_lexical_block: 3340 decl_ctx = GetDeclContextForBlock(die); 3341 try_parsing_type = false; 3342 break; 3343 3344 default: 3345 break; 3346 } 3347 3348 if (decl_ctx == nullptr && try_parsing_type) { 3349 Type *type = die.GetDWARF()->ResolveType(die); 3350 if (type) 3351 decl_ctx = GetCachedClangDeclContextForDIE(die); 3352 } 3353 3354 if (decl_ctx) { 3355 LinkDeclContextToDIE(decl_ctx, die); 3356 return decl_ctx; 3357 } 3358 } 3359 return nullptr; 3360 } 3361 3362 static bool IsSubroutine(const DWARFDIE &die) { 3363 switch (die.Tag()) { 3364 case DW_TAG_subprogram: 3365 case DW_TAG_inlined_subroutine: 3366 return true; 3367 default: 3368 return false; 3369 } 3370 } 3371 3372 static DWARFDIE GetContainingFunctionWithAbstractOrigin(const DWARFDIE &die) { 3373 for (DWARFDIE candidate = die; candidate; candidate = candidate.GetParent()) { 3374 if (IsSubroutine(candidate)) { 3375 if (candidate.GetReferencedDIE(DW_AT_abstract_origin)) { 3376 return candidate; 3377 } else { 3378 return DWARFDIE(); 3379 } 3380 } 3381 } 3382 assert(0 && "Shouldn't call GetContainingFunctionWithAbstractOrigin on " 3383 "something not in a function"); 3384 return DWARFDIE(); 3385 } 3386 3387 static DWARFDIE FindAnyChildWithAbstractOrigin(const DWARFDIE &context) { 3388 for (DWARFDIE candidate = context.GetFirstChild(); candidate.IsValid(); 3389 candidate = candidate.GetSibling()) { 3390 if (candidate.GetReferencedDIE(DW_AT_abstract_origin)) { 3391 return candidate; 3392 } 3393 } 3394 return DWARFDIE(); 3395 } 3396 3397 static DWARFDIE FindFirstChildWithAbstractOrigin(const DWARFDIE &block, 3398 const DWARFDIE &function) { 3399 assert(IsSubroutine(function)); 3400 for (DWARFDIE context = block; context != function.GetParent(); 3401 context = context.GetParent()) { 3402 assert(!IsSubroutine(context) || context == function); 3403 if (DWARFDIE child = FindAnyChildWithAbstractOrigin(context)) { 3404 return child; 3405 } 3406 } 3407 return DWARFDIE(); 3408 } 3409 3410 clang::DeclContext * 3411 DWARFASTParserClang::GetDeclContextForBlock(const DWARFDIE &die) { 3412 assert(die.Tag() == DW_TAG_lexical_block); 3413 DWARFDIE containing_function_with_abstract_origin = 3414 GetContainingFunctionWithAbstractOrigin(die); 3415 if (!containing_function_with_abstract_origin) { 3416 return (clang::DeclContext *)ResolveBlockDIE(die); 3417 } 3418 DWARFDIE child = FindFirstChildWithAbstractOrigin( 3419 die, containing_function_with_abstract_origin); 3420 CompilerDeclContext decl_context = 3421 GetDeclContextContainingUIDFromDWARF(child); 3422 return (clang::DeclContext *)decl_context.GetOpaqueDeclContext(); 3423 } 3424 3425 clang::BlockDecl *DWARFASTParserClang::ResolveBlockDIE(const DWARFDIE &die) { 3426 if (die && die.Tag() == DW_TAG_lexical_block) { 3427 clang::BlockDecl *decl = 3428 llvm::cast_or_null<clang::BlockDecl>(m_die_to_decl_ctx[die.GetDIE()]); 3429 3430 if (!decl) { 3431 DWARFDIE decl_context_die; 3432 clang::DeclContext *decl_context = 3433 GetClangDeclContextContainingDIE(die, &decl_context_die); 3434 decl = m_ast.CreateBlockDeclaration(decl_context); 3435 3436 if (decl) 3437 LinkDeclContextToDIE((clang::DeclContext *)decl, die); 3438 } 3439 3440 return decl; 3441 } 3442 return nullptr; 3443 } 3444 3445 clang::NamespaceDecl * 3446 DWARFASTParserClang::ResolveNamespaceDIE(const DWARFDIE &die) { 3447 if (die && die.Tag() == DW_TAG_namespace) { 3448 // See if we already parsed this namespace DIE and associated it with a 3449 // uniqued namespace declaration 3450 clang::NamespaceDecl *namespace_decl = 3451 static_cast<clang::NamespaceDecl *>(m_die_to_decl_ctx[die.GetDIE()]); 3452 if (namespace_decl) 3453 return namespace_decl; 3454 else { 3455 const char *namespace_name = die.GetName(); 3456 clang::DeclContext *containing_decl_ctx = 3457 GetClangDeclContextContainingDIE(die, nullptr); 3458 bool is_inline = 3459 die.GetAttributeValueAsUnsigned(DW_AT_export_symbols, 0) != 0; 3460 3461 namespace_decl = m_ast.GetUniqueNamespaceDeclaration( 3462 namespace_name, containing_decl_ctx, is_inline); 3463 Log *log = 3464 nullptr; // (LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_INFO)); 3465 if (log) { 3466 SymbolFileDWARF *dwarf = die.GetDWARF(); 3467 if (namespace_name) { 3468 dwarf->GetObjectFile()->GetModule()->LogMessage( 3469 log, 3470 "ASTContext => %p: 0x%8.8" PRIx64 3471 ": DW_TAG_namespace with DW_AT_name(\"%s\") => " 3472 "clang::NamespaceDecl *%p (original = %p)", 3473 static_cast<void *>(&m_ast.getASTContext()), die.GetID(), 3474 namespace_name, static_cast<void *>(namespace_decl), 3475 static_cast<void *>(namespace_decl->getOriginalNamespace())); 3476 } else { 3477 dwarf->GetObjectFile()->GetModule()->LogMessage( 3478 log, 3479 "ASTContext => %p: 0x%8.8" PRIx64 3480 ": DW_TAG_namespace (anonymous) => clang::NamespaceDecl *%p " 3481 "(original = %p)", 3482 static_cast<void *>(&m_ast.getASTContext()), die.GetID(), 3483 static_cast<void *>(namespace_decl), 3484 static_cast<void *>(namespace_decl->getOriginalNamespace())); 3485 } 3486 } 3487 3488 if (namespace_decl) 3489 LinkDeclContextToDIE((clang::DeclContext *)namespace_decl, die); 3490 return namespace_decl; 3491 } 3492 } 3493 return nullptr; 3494 } 3495 3496 clang::DeclContext *DWARFASTParserClang::GetClangDeclContextContainingDIE( 3497 const DWARFDIE &die, DWARFDIE *decl_ctx_die_copy) { 3498 SymbolFileDWARF *dwarf = die.GetDWARF(); 3499 3500 DWARFDIE decl_ctx_die = dwarf->GetDeclContextDIEContainingDIE(die); 3501 3502 if (decl_ctx_die_copy) 3503 *decl_ctx_die_copy = decl_ctx_die; 3504 3505 if (decl_ctx_die) { 3506 clang::DeclContext *clang_decl_ctx = 3507 GetClangDeclContextForDIE(decl_ctx_die); 3508 if (clang_decl_ctx) 3509 return clang_decl_ctx; 3510 } 3511 return m_ast.GetTranslationUnitDecl(); 3512 } 3513 3514 clang::DeclContext * 3515 DWARFASTParserClang::GetCachedClangDeclContextForDIE(const DWARFDIE &die) { 3516 if (die) { 3517 DIEToDeclContextMap::iterator pos = m_die_to_decl_ctx.find(die.GetDIE()); 3518 if (pos != m_die_to_decl_ctx.end()) 3519 return pos->second; 3520 } 3521 return nullptr; 3522 } 3523 3524 void DWARFASTParserClang::LinkDeclContextToDIE(clang::DeclContext *decl_ctx, 3525 const DWARFDIE &die) { 3526 m_die_to_decl_ctx[die.GetDIE()] = decl_ctx; 3527 // There can be many DIEs for a single decl context 3528 // m_decl_ctx_to_die[decl_ctx].insert(die.GetDIE()); 3529 m_decl_ctx_to_die.insert(std::make_pair(decl_ctx, die)); 3530 } 3531 3532 bool DWARFASTParserClang::CopyUniqueClassMethodTypes( 3533 const DWARFDIE &src_class_die, const DWARFDIE &dst_class_die, 3534 lldb_private::Type *class_type, std::vector<DWARFDIE> &failures) { 3535 if (!class_type || !src_class_die || !dst_class_die) 3536 return false; 3537 if (src_class_die.Tag() != dst_class_die.Tag()) 3538 return false; 3539 3540 // We need to complete the class type so we can get all of the method types 3541 // parsed so we can then unique those types to their equivalent counterparts 3542 // in "dst_cu" and "dst_class_die" 3543 class_type->GetFullCompilerType(); 3544 3545 DWARFDIE src_die; 3546 DWARFDIE dst_die; 3547 UniqueCStringMap<DWARFDIE> src_name_to_die; 3548 UniqueCStringMap<DWARFDIE> dst_name_to_die; 3549 UniqueCStringMap<DWARFDIE> src_name_to_die_artificial; 3550 UniqueCStringMap<DWARFDIE> dst_name_to_die_artificial; 3551 for (src_die = src_class_die.GetFirstChild(); src_die.IsValid(); 3552 src_die = src_die.GetSibling()) { 3553 if (src_die.Tag() == DW_TAG_subprogram) { 3554 // Make sure this is a declaration and not a concrete instance by looking 3555 // for DW_AT_declaration set to 1. Sometimes concrete function instances 3556 // are placed inside the class definitions and shouldn't be included in 3557 // the list of things are are tracking here. 3558 if (src_die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0) == 1) { 3559 const char *src_name = src_die.GetMangledName(); 3560 if (src_name) { 3561 ConstString src_const_name(src_name); 3562 if (src_die.GetAttributeValueAsUnsigned(DW_AT_artificial, 0)) 3563 src_name_to_die_artificial.Append(src_const_name, src_die); 3564 else 3565 src_name_to_die.Append(src_const_name, src_die); 3566 } 3567 } 3568 } 3569 } 3570 for (dst_die = dst_class_die.GetFirstChild(); dst_die.IsValid(); 3571 dst_die = dst_die.GetSibling()) { 3572 if (dst_die.Tag() == DW_TAG_subprogram) { 3573 // Make sure this is a declaration and not a concrete instance by looking 3574 // for DW_AT_declaration set to 1. Sometimes concrete function instances 3575 // are placed inside the class definitions and shouldn't be included in 3576 // the list of things are are tracking here. 3577 if (dst_die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0) == 1) { 3578 const char *dst_name = dst_die.GetMangledName(); 3579 if (dst_name) { 3580 ConstString dst_const_name(dst_name); 3581 if (dst_die.GetAttributeValueAsUnsigned(DW_AT_artificial, 0)) 3582 dst_name_to_die_artificial.Append(dst_const_name, dst_die); 3583 else 3584 dst_name_to_die.Append(dst_const_name, dst_die); 3585 } 3586 } 3587 } 3588 } 3589 const uint32_t src_size = src_name_to_die.GetSize(); 3590 const uint32_t dst_size = dst_name_to_die.GetSize(); 3591 Log *log = nullptr; // (LogChannelDWARF::GetLogIfAny(DWARF_LOG_DEBUG_INFO | 3592 // DWARF_LOG_TYPE_COMPLETION)); 3593 3594 // Is everything kosher so we can go through the members at top speed? 3595 bool fast_path = true; 3596 3597 if (src_size != dst_size) { 3598 if (src_size != 0 && dst_size != 0) { 3599 LLDB_LOGF(log, 3600 "warning: trying to unique class DIE 0x%8.8x to 0x%8.8x, " 3601 "but they didn't have the same size (src=%d, dst=%d)", 3602 src_class_die.GetOffset(), dst_class_die.GetOffset(), src_size, 3603 dst_size); 3604 } 3605 3606 fast_path = false; 3607 } 3608 3609 uint32_t idx; 3610 3611 if (fast_path) { 3612 for (idx = 0; idx < src_size; ++idx) { 3613 src_die = src_name_to_die.GetValueAtIndexUnchecked(idx); 3614 dst_die = dst_name_to_die.GetValueAtIndexUnchecked(idx); 3615 3616 if (src_die.Tag() != dst_die.Tag()) { 3617 LLDB_LOGF(log, 3618 "warning: tried to unique class DIE 0x%8.8x to 0x%8.8x, " 3619 "but 0x%8.8x (%s) tags didn't match 0x%8.8x (%s)", 3620 src_class_die.GetOffset(), dst_class_die.GetOffset(), 3621 src_die.GetOffset(), src_die.GetTagAsCString(), 3622 dst_die.GetOffset(), dst_die.GetTagAsCString()); 3623 fast_path = false; 3624 } 3625 3626 const char *src_name = src_die.GetMangledName(); 3627 const char *dst_name = dst_die.GetMangledName(); 3628 3629 // Make sure the names match 3630 if (src_name == dst_name || (strcmp(src_name, dst_name) == 0)) 3631 continue; 3632 3633 LLDB_LOGF(log, 3634 "warning: tried to unique class DIE 0x%8.8x to 0x%8.8x, " 3635 "but 0x%8.8x (%s) names didn't match 0x%8.8x (%s)", 3636 src_class_die.GetOffset(), dst_class_die.GetOffset(), 3637 src_die.GetOffset(), src_name, dst_die.GetOffset(), dst_name); 3638 3639 fast_path = false; 3640 } 3641 } 3642 3643 DWARFASTParserClang *src_dwarf_ast_parser = 3644 (DWARFASTParserClang *)src_die.GetDWARFParser(); 3645 DWARFASTParserClang *dst_dwarf_ast_parser = 3646 (DWARFASTParserClang *)dst_die.GetDWARFParser(); 3647 3648 // Now do the work of linking the DeclContexts and Types. 3649 if (fast_path) { 3650 // We can do this quickly. Just run across the tables index-for-index 3651 // since we know each node has matching names and tags. 3652 for (idx = 0; idx < src_size; ++idx) { 3653 src_die = src_name_to_die.GetValueAtIndexUnchecked(idx); 3654 dst_die = dst_name_to_die.GetValueAtIndexUnchecked(idx); 3655 3656 clang::DeclContext *src_decl_ctx = 3657 src_dwarf_ast_parser->m_die_to_decl_ctx[src_die.GetDIE()]; 3658 if (src_decl_ctx) { 3659 LLDB_LOGF(log, "uniquing decl context %p from 0x%8.8x for 0x%8.8x", 3660 static_cast<void *>(src_decl_ctx), src_die.GetOffset(), 3661 dst_die.GetOffset()); 3662 dst_dwarf_ast_parser->LinkDeclContextToDIE(src_decl_ctx, dst_die); 3663 } else { 3664 LLDB_LOGF(log, 3665 "warning: tried to unique decl context from 0x%8.8x for " 3666 "0x%8.8x, but none was found", 3667 src_die.GetOffset(), dst_die.GetOffset()); 3668 } 3669 3670 Type *src_child_type = 3671 dst_die.GetDWARF()->GetDIEToType()[src_die.GetDIE()]; 3672 if (src_child_type) { 3673 LLDB_LOGF(log, 3674 "uniquing type %p (uid=0x%" PRIx64 3675 ") from 0x%8.8x for 0x%8.8x", 3676 static_cast<void *>(src_child_type), src_child_type->GetID(), 3677 src_die.GetOffset(), dst_die.GetOffset()); 3678 dst_die.GetDWARF()->GetDIEToType()[dst_die.GetDIE()] = src_child_type; 3679 } else { 3680 LLDB_LOGF(log, 3681 "warning: tried to unique lldb_private::Type from " 3682 "0x%8.8x for 0x%8.8x, but none was found", 3683 src_die.GetOffset(), dst_die.GetOffset()); 3684 } 3685 } 3686 } else { 3687 // We must do this slowly. For each member of the destination, look up a 3688 // member in the source with the same name, check its tag, and unique them 3689 // if everything matches up. Report failures. 3690 3691 if (!src_name_to_die.IsEmpty() && !dst_name_to_die.IsEmpty()) { 3692 src_name_to_die.Sort(); 3693 3694 for (idx = 0; idx < dst_size; ++idx) { 3695 ConstString dst_name = dst_name_to_die.GetCStringAtIndex(idx); 3696 dst_die = dst_name_to_die.GetValueAtIndexUnchecked(idx); 3697 src_die = src_name_to_die.Find(dst_name, DWARFDIE()); 3698 3699 if (src_die && (src_die.Tag() == dst_die.Tag())) { 3700 clang::DeclContext *src_decl_ctx = 3701 src_dwarf_ast_parser->m_die_to_decl_ctx[src_die.GetDIE()]; 3702 if (src_decl_ctx) { 3703 LLDB_LOGF(log, "uniquing decl context %p from 0x%8.8x for 0x%8.8x", 3704 static_cast<void *>(src_decl_ctx), src_die.GetOffset(), 3705 dst_die.GetOffset()); 3706 dst_dwarf_ast_parser->LinkDeclContextToDIE(src_decl_ctx, dst_die); 3707 } else { 3708 LLDB_LOGF(log, 3709 "warning: tried to unique decl context from 0x%8.8x " 3710 "for 0x%8.8x, but none was found", 3711 src_die.GetOffset(), dst_die.GetOffset()); 3712 } 3713 3714 Type *src_child_type = 3715 dst_die.GetDWARF()->GetDIEToType()[src_die.GetDIE()]; 3716 if (src_child_type) { 3717 LLDB_LOGF( 3718 log, 3719 "uniquing type %p (uid=0x%" PRIx64 ") from 0x%8.8x for 0x%8.8x", 3720 static_cast<void *>(src_child_type), src_child_type->GetID(), 3721 src_die.GetOffset(), dst_die.GetOffset()); 3722 dst_die.GetDWARF()->GetDIEToType()[dst_die.GetDIE()] = 3723 src_child_type; 3724 } else { 3725 LLDB_LOGF(log, 3726 "warning: tried to unique lldb_private::Type from " 3727 "0x%8.8x for 0x%8.8x, but none was found", 3728 src_die.GetOffset(), dst_die.GetOffset()); 3729 } 3730 } else { 3731 LLDB_LOGF(log, "warning: couldn't find a match for 0x%8.8x", 3732 dst_die.GetOffset()); 3733 3734 failures.push_back(dst_die); 3735 } 3736 } 3737 } 3738 } 3739 3740 const uint32_t src_size_artificial = src_name_to_die_artificial.GetSize(); 3741 const uint32_t dst_size_artificial = dst_name_to_die_artificial.GetSize(); 3742 3743 if (src_size_artificial && dst_size_artificial) { 3744 dst_name_to_die_artificial.Sort(); 3745 3746 for (idx = 0; idx < src_size_artificial; ++idx) { 3747 ConstString src_name_artificial = 3748 src_name_to_die_artificial.GetCStringAtIndex(idx); 3749 src_die = src_name_to_die_artificial.GetValueAtIndexUnchecked(idx); 3750 dst_die = 3751 dst_name_to_die_artificial.Find(src_name_artificial, DWARFDIE()); 3752 3753 if (dst_die) { 3754 // Both classes have the artificial types, link them 3755 clang::DeclContext *src_decl_ctx = 3756 src_dwarf_ast_parser->m_die_to_decl_ctx[src_die.GetDIE()]; 3757 if (src_decl_ctx) { 3758 LLDB_LOGF(log, "uniquing decl context %p from 0x%8.8x for 0x%8.8x", 3759 static_cast<void *>(src_decl_ctx), src_die.GetOffset(), 3760 dst_die.GetOffset()); 3761 dst_dwarf_ast_parser->LinkDeclContextToDIE(src_decl_ctx, dst_die); 3762 } else { 3763 LLDB_LOGF(log, 3764 "warning: tried to unique decl context from 0x%8.8x " 3765 "for 0x%8.8x, but none was found", 3766 src_die.GetOffset(), dst_die.GetOffset()); 3767 } 3768 3769 Type *src_child_type = 3770 dst_die.GetDWARF()->GetDIEToType()[src_die.GetDIE()]; 3771 if (src_child_type) { 3772 LLDB_LOGF( 3773 log, 3774 "uniquing type %p (uid=0x%" PRIx64 ") from 0x%8.8x for 0x%8.8x", 3775 static_cast<void *>(src_child_type), src_child_type->GetID(), 3776 src_die.GetOffset(), dst_die.GetOffset()); 3777 dst_die.GetDWARF()->GetDIEToType()[dst_die.GetDIE()] = src_child_type; 3778 } else { 3779 LLDB_LOGF(log, 3780 "warning: tried to unique lldb_private::Type from " 3781 "0x%8.8x for 0x%8.8x, but none was found", 3782 src_die.GetOffset(), dst_die.GetOffset()); 3783 } 3784 } 3785 } 3786 } 3787 3788 if (dst_size_artificial) { 3789 for (idx = 0; idx < dst_size_artificial; ++idx) { 3790 ConstString dst_name_artificial = 3791 dst_name_to_die_artificial.GetCStringAtIndex(idx); 3792 dst_die = dst_name_to_die_artificial.GetValueAtIndexUnchecked(idx); 3793 LLDB_LOGF(log, 3794 "warning: need to create artificial method for 0x%8.8x for " 3795 "method '%s'", 3796 dst_die.GetOffset(), dst_name_artificial.GetCString()); 3797 3798 failures.push_back(dst_die); 3799 } 3800 } 3801 3802 return !failures.empty(); 3803 } 3804