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 "DWARFDIE.h" 13 #include "DWARFDebugInfo.h" 14 #include "DWARFDeclContext.h" 15 #include "DWARFDefines.h" 16 #include "SymbolFileDWARF.h" 17 #include "SymbolFileDWARFDwo.h" 18 #include "SymbolFileDWARFDebugMap.h" 19 #include "UniqueDWARFASTType.h" 20 21 #include "Plugins/Language/ObjC/ObjCLanguage.h" 22 #include "lldb/Core/Module.h" 23 #include "lldb/Core/Value.h" 24 #include "lldb/Host/Host.h" 25 #include "lldb/Symbol/ClangASTImporter.h" 26 #include "lldb/Symbol/ClangExternalASTSourceCommon.h" 27 #include "lldb/Symbol/ClangUtil.h" 28 #include "lldb/Symbol/CompileUnit.h" 29 #include "lldb/Symbol/Function.h" 30 #include "lldb/Symbol/ObjectFile.h" 31 #include "lldb/Symbol/SymbolVendor.h" 32 #include "lldb/Symbol/TypeList.h" 33 #include "lldb/Symbol/TypeMap.h" 34 #include "lldb/Target/Language.h" 35 #include "lldb/Utility/LLDBAssert.h" 36 #include "lldb/Utility/Log.h" 37 #include "lldb/Utility/StreamString.h" 38 39 #include "clang/AST/CXXInheritance.h" 40 #include "clang/AST/DeclCXX.h" 41 #include "clang/AST/DeclObjC.h" 42 #include "clang/AST/DeclTemplate.h" 43 44 #include <map> 45 #include <memory> 46 #include <vector> 47 48 //#define ENABLE_DEBUG_PRINTF // COMMENT OUT THIS LINE PRIOR TO CHECKIN 49 50 #ifdef ENABLE_DEBUG_PRINTF 51 #include <stdio.h> 52 #define DEBUG_PRINTF(fmt, ...) printf(fmt, __VA_ARGS__) 53 #else 54 #define DEBUG_PRINTF(fmt, ...) 55 #endif 56 57 using namespace lldb; 58 using namespace lldb_private; 59 DWARFASTParserClang::DWARFASTParserClang(ClangASTContext &ast) 60 : m_ast(ast), m_die_to_decl_ctx(), m_decl_ctx_to_die() {} 61 62 DWARFASTParserClang::~DWARFASTParserClang() {} 63 64 static AccessType DW_ACCESS_to_AccessType(uint32_t dwarf_accessibility) { 65 switch (dwarf_accessibility) { 66 case DW_ACCESS_public: 67 return eAccessPublic; 68 case DW_ACCESS_private: 69 return eAccessPrivate; 70 case DW_ACCESS_protected: 71 return eAccessProtected; 72 default: 73 break; 74 } 75 return eAccessNone; 76 } 77 78 static bool DeclKindIsCXXClass(clang::Decl::Kind decl_kind) { 79 switch (decl_kind) { 80 case clang::Decl::CXXRecord: 81 case clang::Decl::ClassTemplateSpecialization: 82 return true; 83 default: 84 break; 85 } 86 return false; 87 } 88 89 struct BitfieldInfo { 90 uint64_t bit_size; 91 uint64_t bit_offset; 92 93 BitfieldInfo() 94 : bit_size(LLDB_INVALID_ADDRESS), bit_offset(LLDB_INVALID_ADDRESS) {} 95 96 void Clear() { 97 bit_size = LLDB_INVALID_ADDRESS; 98 bit_offset = LLDB_INVALID_ADDRESS; 99 } 100 101 bool IsValid() const { 102 return (bit_size != LLDB_INVALID_ADDRESS) && 103 (bit_offset != LLDB_INVALID_ADDRESS); 104 } 105 106 bool NextBitfieldOffsetIsValid(const uint64_t next_bit_offset) const { 107 if (IsValid()) { 108 // This bitfield info is valid, so any subsequent bitfields must not 109 // overlap and must be at a higher bit offset than any previous bitfield 110 // + size. 111 return (bit_size + bit_offset) <= next_bit_offset; 112 } else { 113 // If the this BitfieldInfo is not valid, then any offset isOK 114 return true; 115 } 116 } 117 }; 118 119 ClangASTImporter &DWARFASTParserClang::GetClangASTImporter() { 120 if (!m_clang_ast_importer_up) { 121 m_clang_ast_importer_up.reset(new ClangASTImporter); 122 } 123 return *m_clang_ast_importer_up; 124 } 125 126 /// Detect a forward declaration that is nested in a DW_TAG_module. 127 static bool IsClangModuleFwdDecl(const DWARFDIE &Die) { 128 if (!Die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0)) 129 return false; 130 auto Parent = Die.GetParent(); 131 while (Parent.IsValid()) { 132 if (Parent.Tag() == DW_TAG_module) 133 return true; 134 Parent = Parent.GetParent(); 135 } 136 return false; 137 } 138 139 TypeSP DWARFASTParserClang::ParseTypeFromDWO(const DWARFDIE &die, Log *log) { 140 ModuleSP dwo_module_sp = die.GetContainingDWOModule(); 141 if (!dwo_module_sp) 142 return TypeSP(); 143 144 // If this type comes from a Clang module, look in the DWARF section 145 // of the pcm file in the module cache. Clang generates DWO skeleton 146 // units as breadcrumbs to find them. 147 std::vector<CompilerContext> decl_context; 148 die.GetDeclContext(decl_context); 149 TypeMap dwo_types; 150 151 if (!dwo_module_sp->GetSymbolVendor()->FindTypes(decl_context, true, 152 dwo_types)) { 153 if (!IsClangModuleFwdDecl(die)) 154 return TypeSP(); 155 156 // Since this this type is defined in one of the Clang modules imported by 157 // this symbol file, search all of them. 158 auto *sym_file = die.GetCU()->GetSymbolFileDWARF(); 159 for (const auto &name_module : sym_file->getExternalTypeModules()) { 160 if (!name_module.second) 161 continue; 162 SymbolVendor *sym_vendor = name_module.second->GetSymbolVendor(); 163 if (sym_vendor->FindTypes(decl_context, true, dwo_types)) 164 break; 165 } 166 } 167 168 if (dwo_types.GetSize() != 1) 169 return TypeSP(); 170 171 // We found a real definition for this type in the Clang module, so lets use 172 // it and cache the fact that we found a complete type for this die. 173 TypeSP dwo_type_sp = dwo_types.GetTypeAtIndex(0); 174 if (!dwo_type_sp) 175 return TypeSP(); 176 177 lldb_private::CompilerType dwo_type = dwo_type_sp->GetForwardCompilerType(); 178 179 lldb_private::CompilerType type = 180 GetClangASTImporter().CopyType(m_ast, dwo_type); 181 182 if (!type) 183 return TypeSP(); 184 185 SymbolFileDWARF *dwarf = die.GetDWARF(); 186 TypeSP type_sp(new Type( 187 die.GetID(), dwarf, dwo_type_sp->GetName(), dwo_type_sp->GetByteSize(), 188 NULL, LLDB_INVALID_UID, Type::eEncodingInvalid, 189 &dwo_type_sp->GetDeclaration(), type, Type::eResolveStateForward)); 190 191 dwarf->GetTypeList()->Insert(type_sp); 192 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 193 clang::TagDecl *tag_decl = ClangASTContext::GetAsTagDecl(type); 194 if (tag_decl) 195 LinkDeclContextToDIE(tag_decl, die); 196 else { 197 clang::DeclContext *defn_decl_ctx = GetCachedClangDeclContextForDIE(die); 198 if (defn_decl_ctx) 199 LinkDeclContextToDIE(defn_decl_ctx, die); 200 } 201 202 return type_sp; 203 } 204 205 static void CompleteExternalTagDeclType(ClangASTImporter &ast_importer, 206 clang::DeclContext *decl_ctx, 207 DWARFDIE die, 208 const char *type_name_cstr) { 209 auto *tag_decl_ctx = clang::dyn_cast<clang::TagDecl>(decl_ctx); 210 if (!tag_decl_ctx) 211 return; 212 213 // If this type was not imported from an external AST, there's nothing to do. 214 CompilerType type = ClangASTContext::GetTypeForDecl(tag_decl_ctx); 215 if (!type || !ast_importer.CanImport(type)) 216 return; 217 218 auto qual_type = ClangUtil::GetQualType(type); 219 if (!ast_importer.RequireCompleteType(qual_type)) { 220 die.GetDWARF()->GetObjectFile()->GetModule()->ReportError( 221 "Unable to complete the Decl context for DIE '%s' at offset " 222 "0x%8.8x.\nPlease file a bug report.", 223 type_name_cstr ? type_name_cstr : "", die.GetOffset()); 224 // We need to make the type look complete otherwise, we might crash in 225 // Clang when adding children. 226 if (ClangASTContext::StartTagDeclarationDefinition(type)) 227 ClangASTContext::CompleteTagDeclarationDefinition(type); 228 } 229 } 230 231 TypeSP DWARFASTParserClang::ParseTypeFromDWARF(const SymbolContext &sc, 232 const DWARFDIE &die, Log *log, 233 bool *type_is_new_ptr) { 234 TypeSP type_sp; 235 236 if (type_is_new_ptr) 237 *type_is_new_ptr = false; 238 239 AccessType accessibility = eAccessNone; 240 if (die) { 241 SymbolFileDWARF *dwarf = die.GetDWARF(); 242 if (log) { 243 DWARFDIE context_die; 244 clang::DeclContext *context = 245 GetClangDeclContextContainingDIE(die, &context_die); 246 247 dwarf->GetObjectFile()->GetModule()->LogMessage( 248 log, "SymbolFileDWARF::ParseType (die = 0x%8.8x, decl_ctx = %p (die " 249 "0x%8.8x)) %s name = '%s')", 250 die.GetOffset(), static_cast<void *>(context), 251 context_die.GetOffset(), die.GetTagAsCString(), die.GetName()); 252 } 253 Type *type_ptr = dwarf->GetDIEToType().lookup(die.GetDIE()); 254 TypeList *type_list = dwarf->GetTypeList(); 255 if (type_ptr == NULL) { 256 if (type_is_new_ptr) 257 *type_is_new_ptr = true; 258 259 const dw_tag_t tag = die.Tag(); 260 261 bool is_forward_declaration = false; 262 DWARFAttributes attributes; 263 const char *type_name_cstr = NULL; 264 const char *mangled_name_cstr = NULL; 265 ConstString type_name_const_str; 266 Type::ResolveState resolve_state = Type::eResolveStateUnresolved; 267 llvm::Optional<uint64_t> byte_size; 268 Declaration decl; 269 270 Type::EncodingDataType encoding_data_type = Type::eEncodingIsUID; 271 CompilerType clang_type; 272 DWARFFormValue form_value; 273 274 dw_attr_t attr; 275 276 switch (tag) { 277 case DW_TAG_typedef: 278 case DW_TAG_base_type: 279 case DW_TAG_pointer_type: 280 case DW_TAG_reference_type: 281 case DW_TAG_rvalue_reference_type: 282 case DW_TAG_const_type: 283 case DW_TAG_restrict_type: 284 case DW_TAG_volatile_type: 285 case DW_TAG_unspecified_type: { 286 // Set a bit that lets us know that we are currently parsing this 287 dwarf->GetDIEToType()[die.GetDIE()] = DIE_IS_BEING_PARSED; 288 289 const size_t num_attributes = die.GetAttributes(attributes); 290 uint32_t encoding = 0; 291 DWARFFormValue encoding_uid; 292 293 if (num_attributes > 0) { 294 uint32_t i; 295 for (i = 0; i < num_attributes; ++i) { 296 attr = attributes.AttributeAtIndex(i); 297 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 298 switch (attr) { 299 case DW_AT_decl_file: 300 decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex( 301 form_value.Unsigned())); 302 break; 303 case DW_AT_decl_line: 304 decl.SetLine(form_value.Unsigned()); 305 break; 306 case DW_AT_decl_column: 307 decl.SetColumn(form_value.Unsigned()); 308 break; 309 case DW_AT_name: 310 type_name_cstr = form_value.AsCString(); 311 if (type_name_cstr) 312 type_name_const_str.SetCString(type_name_cstr); 313 break; 314 case DW_AT_byte_size: 315 byte_size = form_value.Unsigned(); 316 break; 317 case DW_AT_encoding: 318 encoding = form_value.Unsigned(); 319 break; 320 case DW_AT_type: 321 encoding_uid = form_value; 322 break; 323 default: 324 case DW_AT_sibling: 325 break; 326 } 327 } 328 } 329 } 330 331 if (tag == DW_TAG_typedef && encoding_uid.IsValid()) { 332 // Try to parse a typedef from the DWO file first as modules can 333 // contain typedef'ed structures that have no names like: 334 // 335 // typedef struct { int a; } Foo; 336 // 337 // In this case we will have a structure with no name and a typedef 338 // named "Foo" that points to this unnamed structure. The name in the 339 // typedef is the only identifier for the struct, so always try to 340 // get typedefs from DWO files if possible. 341 // 342 // The type_sp returned will be empty if the typedef doesn't exist in 343 // a DWO file, so it is cheap to call this function just to check. 344 // 345 // If we don't do this we end up creating a TypeSP that says this is 346 // a typedef to type 0x123 (the DW_AT_type value would be 0x123 in 347 // the DW_TAG_typedef), and this is the unnamed structure type. We 348 // will have a hard time tracking down an unnammed structure type in 349 // the module DWO file, so we make sure we don't get into this 350 // situation by always resolving typedefs from the DWO file. 351 const DWARFDIE encoding_die = encoding_uid.Reference(); 352 353 // First make sure that the die that this is typedef'ed to _is_ just 354 // a declaration (DW_AT_declaration == 1), not a full definition 355 // since template types can't be represented in modules since only 356 // concrete instances of templates are ever emitted and modules won't 357 // contain those 358 if (encoding_die && 359 encoding_die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0) == 360 1) { 361 type_sp = ParseTypeFromDWO(die, log); 362 if (type_sp) 363 return type_sp; 364 } 365 } 366 367 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\") type => 0x%8.8lx\n", 368 die.GetID(), DW_TAG_value_to_name(tag), type_name_cstr, 369 encoding_uid.Reference()); 370 371 switch (tag) { 372 default: 373 break; 374 375 case DW_TAG_unspecified_type: 376 if (strcmp(type_name_cstr, "nullptr_t") == 0 || 377 strcmp(type_name_cstr, "decltype(nullptr)") == 0) { 378 resolve_state = Type::eResolveStateFull; 379 clang_type = m_ast.GetBasicType(eBasicTypeNullPtr); 380 break; 381 } 382 // Fall through to base type below in case we can handle the type 383 // there... 384 LLVM_FALLTHROUGH; 385 386 case DW_TAG_base_type: 387 resolve_state = Type::eResolveStateFull; 388 clang_type = m_ast.GetBuiltinTypeForDWARFEncodingAndBitSize( 389 type_name_cstr, encoding, byte_size.getValueOr(0) * 8); 390 break; 391 392 case DW_TAG_pointer_type: 393 encoding_data_type = Type::eEncodingIsPointerUID; 394 break; 395 case DW_TAG_reference_type: 396 encoding_data_type = Type::eEncodingIsLValueReferenceUID; 397 break; 398 case DW_TAG_rvalue_reference_type: 399 encoding_data_type = Type::eEncodingIsRValueReferenceUID; 400 break; 401 case DW_TAG_typedef: 402 encoding_data_type = Type::eEncodingIsTypedefUID; 403 break; 404 case DW_TAG_const_type: 405 encoding_data_type = Type::eEncodingIsConstUID; 406 break; 407 case DW_TAG_restrict_type: 408 encoding_data_type = Type::eEncodingIsRestrictUID; 409 break; 410 case DW_TAG_volatile_type: 411 encoding_data_type = Type::eEncodingIsVolatileUID; 412 break; 413 } 414 415 if (!clang_type && 416 (encoding_data_type == Type::eEncodingIsPointerUID || 417 encoding_data_type == Type::eEncodingIsTypedefUID)) { 418 if (tag == DW_TAG_pointer_type) { 419 DWARFDIE target_die = die.GetReferencedDIE(DW_AT_type); 420 421 if (target_die.GetAttributeValueAsUnsigned(DW_AT_APPLE_block, 0)) { 422 // Blocks have a __FuncPtr inside them which is a pointer to a 423 // function of the proper type. 424 425 for (DWARFDIE child_die = target_die.GetFirstChild(); 426 child_die.IsValid(); child_die = child_die.GetSibling()) { 427 if (!strcmp(child_die.GetAttributeValueAsString(DW_AT_name, ""), 428 "__FuncPtr")) { 429 DWARFDIE function_pointer_type = 430 child_die.GetReferencedDIE(DW_AT_type); 431 432 if (function_pointer_type) { 433 DWARFDIE function_type = 434 function_pointer_type.GetReferencedDIE(DW_AT_type); 435 436 bool function_type_is_new_pointer; 437 TypeSP lldb_function_type_sp = ParseTypeFromDWARF( 438 sc, function_type, log, &function_type_is_new_pointer); 439 440 if (lldb_function_type_sp) { 441 clang_type = m_ast.CreateBlockPointerType( 442 lldb_function_type_sp->GetForwardCompilerType()); 443 encoding_data_type = Type::eEncodingIsUID; 444 encoding_uid.Clear(); 445 resolve_state = Type::eResolveStateFull; 446 } 447 } 448 449 break; 450 } 451 } 452 } 453 } 454 455 bool translation_unit_is_objc = 456 (sc.comp_unit->GetLanguage() == eLanguageTypeObjC || 457 sc.comp_unit->GetLanguage() == eLanguageTypeObjC_plus_plus); 458 459 if (translation_unit_is_objc) { 460 if (type_name_cstr != NULL) { 461 static ConstString g_objc_type_name_id("id"); 462 static ConstString g_objc_type_name_Class("Class"); 463 static ConstString g_objc_type_name_selector("SEL"); 464 465 if (type_name_const_str == g_objc_type_name_id) { 466 if (log) 467 dwarf->GetObjectFile()->GetModule()->LogMessage( 468 log, "SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' " 469 "is Objective-C 'id' built-in type.", 470 die.GetOffset(), die.GetTagAsCString(), die.GetName()); 471 clang_type = m_ast.GetBasicType(eBasicTypeObjCID); 472 encoding_data_type = Type::eEncodingIsUID; 473 encoding_uid.Clear(); 474 resolve_state = Type::eResolveStateFull; 475 476 } else if (type_name_const_str == g_objc_type_name_Class) { 477 if (log) 478 dwarf->GetObjectFile()->GetModule()->LogMessage( 479 log, "SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' " 480 "is Objective-C 'Class' built-in type.", 481 die.GetOffset(), die.GetTagAsCString(), die.GetName()); 482 clang_type = m_ast.GetBasicType(eBasicTypeObjCClass); 483 encoding_data_type = Type::eEncodingIsUID; 484 encoding_uid.Clear(); 485 resolve_state = Type::eResolveStateFull; 486 } else if (type_name_const_str == g_objc_type_name_selector) { 487 if (log) 488 dwarf->GetObjectFile()->GetModule()->LogMessage( 489 log, "SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' " 490 "is Objective-C 'selector' built-in type.", 491 die.GetOffset(), die.GetTagAsCString(), die.GetName()); 492 clang_type = m_ast.GetBasicType(eBasicTypeObjCSel); 493 encoding_data_type = Type::eEncodingIsUID; 494 encoding_uid.Clear(); 495 resolve_state = Type::eResolveStateFull; 496 } 497 } else if (encoding_data_type == Type::eEncodingIsPointerUID && 498 encoding_uid.IsValid()) { 499 // Clang sometimes erroneously emits id as objc_object*. In that 500 // case we fix up the type to "id". 501 502 const DWARFDIE encoding_die = encoding_uid.Reference(); 503 504 if (encoding_die && encoding_die.Tag() == DW_TAG_structure_type) { 505 if (const char *struct_name = encoding_die.GetName()) { 506 if (!strcmp(struct_name, "objc_object")) { 507 if (log) 508 dwarf->GetObjectFile()->GetModule()->LogMessage( 509 log, "SymbolFileDWARF::ParseType (die = 0x%8.8x) %s " 510 "'%s' is 'objc_object*', which we overrode to " 511 "'id'.", 512 die.GetOffset(), die.GetTagAsCString(), 513 die.GetName()); 514 clang_type = m_ast.GetBasicType(eBasicTypeObjCID); 515 encoding_data_type = Type::eEncodingIsUID; 516 encoding_uid.Clear(); 517 resolve_state = Type::eResolveStateFull; 518 } 519 } 520 } 521 } 522 } 523 } 524 525 type_sp = std::make_shared<Type>( 526 die.GetID(), dwarf, type_name_const_str, byte_size, nullptr, 527 dwarf->GetUID(DIERef(encoding_uid)), encoding_data_type, &decl, 528 clang_type, resolve_state); 529 530 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 531 } break; 532 533 case DW_TAG_structure_type: 534 case DW_TAG_union_type: 535 case DW_TAG_class_type: { 536 // Set a bit that lets us know that we are currently parsing this 537 dwarf->GetDIEToType()[die.GetDIE()] = DIE_IS_BEING_PARSED; 538 539 LanguageType class_language = eLanguageTypeUnknown; 540 bool is_complete_objc_class = false; 541 size_t calling_convention 542 = llvm::dwarf::CallingConvention::DW_CC_normal; 543 544 const size_t num_attributes = die.GetAttributes(attributes); 545 if (num_attributes > 0) { 546 uint32_t i; 547 for (i = 0; i < num_attributes; ++i) { 548 attr = attributes.AttributeAtIndex(i); 549 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 550 switch (attr) { 551 case DW_AT_decl_file: 552 decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex( 553 form_value.Unsigned())); 554 break; 555 556 case DW_AT_decl_line: 557 decl.SetLine(form_value.Unsigned()); 558 break; 559 560 case DW_AT_decl_column: 561 decl.SetColumn(form_value.Unsigned()); 562 break; 563 564 case DW_AT_name: 565 type_name_cstr = form_value.AsCString(); 566 type_name_const_str.SetCString(type_name_cstr); 567 break; 568 569 case DW_AT_byte_size: 570 byte_size = form_value.Unsigned(); 571 break; 572 573 case DW_AT_accessibility: 574 accessibility = DW_ACCESS_to_AccessType(form_value.Unsigned()); 575 break; 576 577 case DW_AT_declaration: 578 is_forward_declaration = form_value.Boolean(); 579 break; 580 581 case DW_AT_APPLE_runtime_class: 582 class_language = (LanguageType)form_value.Signed(); 583 break; 584 585 case DW_AT_APPLE_objc_complete_type: 586 is_complete_objc_class = form_value.Signed(); 587 break; 588 case DW_AT_calling_convention: 589 calling_convention = form_value.Unsigned(); 590 break; 591 592 case DW_AT_allocated: 593 case DW_AT_associated: 594 case DW_AT_data_location: 595 case DW_AT_description: 596 case DW_AT_start_scope: 597 case DW_AT_visibility: 598 default: 599 case DW_AT_sibling: 600 break; 601 } 602 } 603 } 604 } 605 606 // UniqueDWARFASTType is large, so don't create a local variables on 607 // the stack, put it on the heap. This function is often called 608 // recursively and clang isn't good and sharing the stack space for 609 // variables in different blocks. 610 std::unique_ptr<UniqueDWARFASTType> unique_ast_entry_up( 611 new UniqueDWARFASTType()); 612 613 ConstString unique_typename(type_name_const_str); 614 Declaration unique_decl(decl); 615 616 if (type_name_const_str) { 617 LanguageType die_language = die.GetLanguage(); 618 if (Language::LanguageIsCPlusPlus(die_language)) { 619 // For C++, we rely solely upon the one definition rule that says 620 // only one thing can exist at a given decl context. We ignore the 621 // file and line that things are declared on. 622 std::string qualified_name; 623 if (die.GetQualifiedName(qualified_name)) 624 unique_typename = ConstString(qualified_name); 625 unique_decl.Clear(); 626 } 627 628 if (dwarf->GetUniqueDWARFASTTypeMap().Find( 629 unique_typename, die, unique_decl, 630 byte_size ? *byte_size : -1, *unique_ast_entry_up)) { 631 type_sp = unique_ast_entry_up->m_type_sp; 632 if (type_sp) { 633 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 634 return type_sp; 635 } 636 } 637 } 638 639 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(), 640 DW_TAG_value_to_name(tag), type_name_cstr); 641 642 int tag_decl_kind = -1; 643 AccessType default_accessibility = eAccessNone; 644 if (tag == DW_TAG_structure_type) { 645 tag_decl_kind = clang::TTK_Struct; 646 default_accessibility = eAccessPublic; 647 } else if (tag == DW_TAG_union_type) { 648 tag_decl_kind = clang::TTK_Union; 649 default_accessibility = eAccessPublic; 650 } else if (tag == DW_TAG_class_type) { 651 tag_decl_kind = clang::TTK_Class; 652 default_accessibility = eAccessPrivate; 653 } 654 655 if (byte_size && *byte_size == 0 && type_name_cstr && 656 !die.HasChildren() && 657 sc.comp_unit->GetLanguage() == eLanguageTypeObjC) { 658 // Work around an issue with clang at the moment where forward 659 // declarations for objective C classes are emitted as: 660 // DW_TAG_structure_type [2] 661 // DW_AT_name( "ForwardObjcClass" ) 662 // DW_AT_byte_size( 0x00 ) 663 // DW_AT_decl_file( "..." ) 664 // DW_AT_decl_line( 1 ) 665 // 666 // Note that there is no DW_AT_declaration and there are no children, 667 // and the byte size is zero. 668 is_forward_declaration = true; 669 } 670 671 if (class_language == eLanguageTypeObjC || 672 class_language == eLanguageTypeObjC_plus_plus) { 673 if (!is_complete_objc_class && 674 die.Supports_DW_AT_APPLE_objc_complete_type()) { 675 // We have a valid eSymbolTypeObjCClass class symbol whose name 676 // matches the current objective C class that we are trying to find 677 // and this DIE isn't the complete definition (we checked 678 // is_complete_objc_class above and know it is false), so the real 679 // definition is in here somewhere 680 type_sp = dwarf->FindCompleteObjCDefinitionTypeForDIE( 681 die, type_name_const_str, true); 682 683 if (!type_sp) { 684 SymbolFileDWARFDebugMap *debug_map_symfile = 685 dwarf->GetDebugMapSymfile(); 686 if (debug_map_symfile) { 687 // We weren't able to find a full declaration in this DWARF, 688 // see if we have a declaration anywhere else... 689 type_sp = 690 debug_map_symfile->FindCompleteObjCDefinitionTypeForDIE( 691 die, type_name_const_str, true); 692 } 693 } 694 695 if (type_sp) { 696 if (log) { 697 dwarf->GetObjectFile()->GetModule()->LogMessage( 698 log, "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is an " 699 "incomplete objc type, complete type is 0x%8.8" PRIx64, 700 static_cast<void *>(this), die.GetOffset(), 701 DW_TAG_value_to_name(tag), type_name_cstr, 702 type_sp->GetID()); 703 } 704 705 // We found a real definition for this type elsewhere so lets use 706 // it and cache the fact that we found a complete type for this 707 // die 708 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 709 return type_sp; 710 } 711 } 712 } 713 714 if (is_forward_declaration) { 715 // We have a forward declaration to a type and we need to try and 716 // find a full declaration. We look in the current type index just in 717 // case we have a forward declaration followed by an actual 718 // declarations in the DWARF. If this fails, we need to look 719 // elsewhere... 720 if (log) { 721 dwarf->GetObjectFile()->GetModule()->LogMessage( 722 log, "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is a " 723 "forward declaration, trying to find complete type", 724 static_cast<void *>(this), die.GetOffset(), 725 DW_TAG_value_to_name(tag), type_name_cstr); 726 } 727 728 // See if the type comes from a DWO module and if so, track down that 729 // type. 730 type_sp = ParseTypeFromDWO(die, log); 731 if (type_sp) 732 return type_sp; 733 734 DWARFDeclContext die_decl_ctx; 735 die.GetDWARFDeclContext(die_decl_ctx); 736 737 // type_sp = FindDefinitionTypeForDIE (dwarf_cu, die, 738 // type_name_const_str); 739 type_sp = dwarf->FindDefinitionTypeForDWARFDeclContext(die_decl_ctx); 740 741 if (!type_sp) { 742 SymbolFileDWARFDebugMap *debug_map_symfile = 743 dwarf->GetDebugMapSymfile(); 744 if (debug_map_symfile) { 745 // We weren't able to find a full declaration in this DWARF, see 746 // if we have a declaration anywhere else... 747 type_sp = 748 debug_map_symfile->FindDefinitionTypeForDWARFDeclContext( 749 die_decl_ctx); 750 } 751 } 752 753 if (type_sp) { 754 if (log) { 755 dwarf->GetObjectFile()->GetModule()->LogMessage( 756 log, "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is a " 757 "forward declaration, complete type is 0x%8.8" PRIx64, 758 static_cast<void *>(this), die.GetOffset(), 759 DW_TAG_value_to_name(tag), type_name_cstr, type_sp->GetID()); 760 } 761 762 // We found a real definition for this type elsewhere so lets use 763 // it and cache the fact that we found a complete type for this die 764 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 765 clang::DeclContext *defn_decl_ctx = GetCachedClangDeclContextForDIE( 766 dwarf->GetDIE(type_sp->GetID())); 767 if (defn_decl_ctx) 768 LinkDeclContextToDIE(defn_decl_ctx, die); 769 return type_sp; 770 } 771 } 772 assert(tag_decl_kind != -1); 773 bool clang_type_was_created = false; 774 clang_type.SetCompilerType( 775 &m_ast, dwarf->GetForwardDeclDieToClangType().lookup(die.GetDIE())); 776 if (!clang_type) { 777 clang::DeclContext *decl_ctx = 778 GetClangDeclContextContainingDIE(die, nullptr); 779 780 // If your decl context is a record that was imported from another 781 // AST context (in the gmodules case), we need to make sure the type 782 // backing the Decl is complete before adding children to it. This is 783 // not an issue in the non-gmodules case because the debug info will 784 // always contain a full definition of parent types in that case. 785 CompleteExternalTagDeclType(GetClangASTImporter(), decl_ctx, die, 786 type_name_cstr); 787 788 if (accessibility == eAccessNone && decl_ctx) { 789 // Check the decl context that contains this class/struct/union. If 790 // it is a class we must give it an accessibility. 791 const clang::Decl::Kind containing_decl_kind = 792 decl_ctx->getDeclKind(); 793 if (DeclKindIsCXXClass(containing_decl_kind)) 794 accessibility = default_accessibility; 795 } 796 797 ClangASTMetadata metadata; 798 metadata.SetUserID(die.GetID()); 799 metadata.SetIsDynamicCXXType(dwarf->ClassOrStructIsVirtual(die)); 800 801 if (type_name_cstr && strchr(type_name_cstr, '<')) { 802 ClangASTContext::TemplateParameterInfos template_param_infos; 803 if (ParseTemplateParameterInfos(die, template_param_infos)) { 804 clang::ClassTemplateDecl *class_template_decl = 805 m_ast.ParseClassTemplateDecl(decl_ctx, accessibility, 806 type_name_cstr, tag_decl_kind, 807 template_param_infos); 808 if (!class_template_decl) { 809 if (log) { 810 dwarf->GetObjectFile()->GetModule()->LogMessage( 811 log, "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" " 812 "clang::ClassTemplateDecl failed to return a decl.", 813 static_cast<void *>(this), die.GetOffset(), 814 DW_TAG_value_to_name(tag), type_name_cstr); 815 } 816 return TypeSP(); 817 } 818 819 clang::ClassTemplateSpecializationDecl 820 *class_specialization_decl = 821 m_ast.CreateClassTemplateSpecializationDecl( 822 decl_ctx, class_template_decl, tag_decl_kind, 823 template_param_infos); 824 clang_type = m_ast.CreateClassTemplateSpecializationType( 825 class_specialization_decl); 826 clang_type_was_created = true; 827 828 m_ast.SetMetadata(class_template_decl, metadata); 829 m_ast.SetMetadata(class_specialization_decl, metadata); 830 } 831 } 832 833 if (!clang_type_was_created) { 834 clang_type_was_created = true; 835 clang_type = m_ast.CreateRecordType(decl_ctx, accessibility, 836 type_name_cstr, tag_decl_kind, 837 class_language, &metadata); 838 } 839 } 840 841 // Store a forward declaration to this class type in case any 842 // parameters in any class methods need it for the clang types for 843 // function prototypes. 844 LinkDeclContextToDIE(m_ast.GetDeclContextForType(clang_type), die); 845 type_sp = std::make_shared<Type>( 846 die.GetID(), dwarf, type_name_const_str, byte_size, nullptr, 847 LLDB_INVALID_UID, Type::eEncodingIsUID, &decl, clang_type, 848 Type::eResolveStateForward); 849 850 type_sp->SetIsCompleteObjCClass(is_complete_objc_class); 851 852 // Add our type to the unique type map so we don't end up creating many 853 // copies of the same type over and over in the ASTContext for our 854 // module 855 unique_ast_entry_up->m_type_sp = type_sp; 856 unique_ast_entry_up->m_die = die; 857 unique_ast_entry_up->m_declaration = unique_decl; 858 unique_ast_entry_up->m_byte_size = byte_size.getValueOr(0); 859 dwarf->GetUniqueDWARFASTTypeMap().Insert(unique_typename, 860 *unique_ast_entry_up); 861 862 if (is_forward_declaration && die.HasChildren()) { 863 // Check to see if the DIE actually has a definition, some version of 864 // GCC will 865 // emit DIEs with DW_AT_declaration set to true, but yet still have 866 // subprogram, members, or inheritance, so we can't trust it 867 DWARFDIE child_die = die.GetFirstChild(); 868 while (child_die) { 869 switch (child_die.Tag()) { 870 case DW_TAG_inheritance: 871 case DW_TAG_subprogram: 872 case DW_TAG_member: 873 case DW_TAG_APPLE_property: 874 case DW_TAG_class_type: 875 case DW_TAG_structure_type: 876 case DW_TAG_enumeration_type: 877 case DW_TAG_typedef: 878 case DW_TAG_union_type: 879 child_die.Clear(); 880 is_forward_declaration = false; 881 break; 882 default: 883 child_die = child_die.GetSibling(); 884 break; 885 } 886 } 887 } 888 889 if (!is_forward_declaration) { 890 // Always start the definition for a class type so that if the class 891 // has child classes or types that require the class to be created 892 // for use as their decl contexts the class will be ready to accept 893 // these child definitions. 894 if (!die.HasChildren()) { 895 // No children for this struct/union/class, lets finish it 896 if (ClangASTContext::StartTagDeclarationDefinition(clang_type)) { 897 ClangASTContext::CompleteTagDeclarationDefinition(clang_type); 898 } else { 899 dwarf->GetObjectFile()->GetModule()->ReportError( 900 "DWARF DIE at 0x%8.8x named \"%s\" was not able to start its " 901 "definition.\nPlease file a bug and attach the file at the " 902 "start of this error message", 903 die.GetOffset(), type_name_cstr); 904 } 905 906 if (tag == DW_TAG_structure_type) // this only applies in C 907 { 908 clang::RecordDecl *record_decl = 909 ClangASTContext::GetAsRecordDecl(clang_type); 910 911 if (record_decl) { 912 GetClangASTImporter().InsertRecordDecl( 913 record_decl, ClangASTImporter::LayoutInfo()); 914 } 915 } 916 } else if (clang_type_was_created) { 917 // Start the definition if the class is not objective C since the 918 // underlying decls respond to isCompleteDefinition(). Objective 919 // C decls don't respond to isCompleteDefinition() so we can't 920 // start the declaration definition right away. For C++ 921 // class/union/structs we want to start the definition in case the 922 // class is needed as the declaration context for a contained class 923 // or type without the need to complete that type.. 924 925 if (class_language != eLanguageTypeObjC && 926 class_language != eLanguageTypeObjC_plus_plus) 927 ClangASTContext::StartTagDeclarationDefinition(clang_type); 928 929 // Leave this as a forward declaration until we need to know the 930 // details of the type. lldb_private::Type will automatically call 931 // the SymbolFile virtual function 932 // "SymbolFileDWARF::CompleteType(Type *)" When the definition 933 // needs to be defined. 934 assert(!dwarf->GetForwardDeclClangTypeToDie().count( 935 ClangUtil::RemoveFastQualifiers(clang_type) 936 .GetOpaqueQualType()) && 937 "Type already in the forward declaration map!"); 938 // Can't assume m_ast.GetSymbolFile() is actually a 939 // SymbolFileDWARF, it can be a SymbolFileDWARFDebugMap for Apple 940 // binaries. 941 dwarf->GetForwardDeclDieToClangType()[die.GetDIE()] = 942 clang_type.GetOpaqueQualType(); 943 dwarf->GetForwardDeclClangTypeToDie() 944 [ClangUtil::RemoveFastQualifiers(clang_type) 945 .GetOpaqueQualType()] = die.GetDIERef(); 946 m_ast.SetHasExternalStorage(clang_type.GetOpaqueQualType(), true); 947 } 948 } 949 950 // If we made a clang type, set the trivial abi if applicable: We only 951 // do this for pass by value - which implies the Trivial ABI. There 952 // isn't a way to assert that something that would normally be pass by 953 // value is pass by reference, so we ignore that attribute if set. 954 if (calling_convention == llvm::dwarf::DW_CC_pass_by_value) { 955 clang::CXXRecordDecl *record_decl = 956 m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType()); 957 if (record_decl) { 958 record_decl->setHasTrivialSpecialMemberForCall(); 959 } 960 } 961 962 if (calling_convention == llvm::dwarf::DW_CC_pass_by_reference) { 963 clang::CXXRecordDecl *record_decl = 964 m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType()); 965 if (record_decl) 966 record_decl->setArgPassingRestrictions( 967 clang::RecordDecl::APK_CannotPassInRegs); 968 } 969 970 } break; 971 972 case DW_TAG_enumeration_type: { 973 // Set a bit that lets us know that we are currently parsing this 974 dwarf->GetDIEToType()[die.GetDIE()] = DIE_IS_BEING_PARSED; 975 976 bool is_scoped = false; 977 DWARFFormValue encoding_form; 978 979 const size_t num_attributes = die.GetAttributes(attributes); 980 if (num_attributes > 0) { 981 uint32_t i; 982 983 for (i = 0; i < num_attributes; ++i) { 984 attr = attributes.AttributeAtIndex(i); 985 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 986 switch (attr) { 987 case DW_AT_decl_file: 988 decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex( 989 form_value.Unsigned())); 990 break; 991 case DW_AT_decl_line: 992 decl.SetLine(form_value.Unsigned()); 993 break; 994 case DW_AT_decl_column: 995 decl.SetColumn(form_value.Unsigned()); 996 break; 997 case DW_AT_name: 998 type_name_cstr = form_value.AsCString(); 999 type_name_const_str.SetCString(type_name_cstr); 1000 break; 1001 case DW_AT_type: 1002 encoding_form = form_value; 1003 break; 1004 case DW_AT_byte_size: 1005 byte_size = form_value.Unsigned(); 1006 break; 1007 case DW_AT_accessibility: 1008 break; // accessibility = 1009 // DW_ACCESS_to_AccessType(form_value.Unsigned()); break; 1010 case DW_AT_declaration: 1011 is_forward_declaration = form_value.Boolean(); 1012 break; 1013 case DW_AT_enum_class: 1014 is_scoped = form_value.Boolean(); 1015 break; 1016 case DW_AT_allocated: 1017 case DW_AT_associated: 1018 case DW_AT_bit_stride: 1019 case DW_AT_byte_stride: 1020 case DW_AT_data_location: 1021 case DW_AT_description: 1022 case DW_AT_start_scope: 1023 case DW_AT_visibility: 1024 case DW_AT_specification: 1025 case DW_AT_abstract_origin: 1026 case DW_AT_sibling: 1027 break; 1028 } 1029 } 1030 } 1031 1032 if (is_forward_declaration) { 1033 type_sp = ParseTypeFromDWO(die, log); 1034 if (type_sp) 1035 return type_sp; 1036 1037 DWARFDeclContext die_decl_ctx; 1038 die.GetDWARFDeclContext(die_decl_ctx); 1039 1040 type_sp = 1041 dwarf->FindDefinitionTypeForDWARFDeclContext(die_decl_ctx); 1042 1043 if (!type_sp) { 1044 SymbolFileDWARFDebugMap *debug_map_symfile = 1045 dwarf->GetDebugMapSymfile(); 1046 if (debug_map_symfile) { 1047 // We weren't able to find a full declaration in this DWARF, 1048 // see if we have a declaration anywhere else... 1049 type_sp = 1050 debug_map_symfile->FindDefinitionTypeForDWARFDeclContext( 1051 die_decl_ctx); 1052 } 1053 } 1054 1055 if (type_sp) { 1056 if (log) { 1057 dwarf->GetObjectFile()->GetModule()->LogMessage( 1058 log, "SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is a " 1059 "forward declaration, complete type is 0x%8.8" PRIx64, 1060 static_cast<void *>(this), die.GetOffset(), 1061 DW_TAG_value_to_name(tag), type_name_cstr, 1062 type_sp->GetID()); 1063 } 1064 1065 // We found a real definition for this type elsewhere so lets use 1066 // it and cache the fact that we found a complete type for this 1067 // die 1068 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 1069 clang::DeclContext *defn_decl_ctx = 1070 GetCachedClangDeclContextForDIE( 1071 dwarf->GetDIE(type_sp->GetID())); 1072 if (defn_decl_ctx) 1073 LinkDeclContextToDIE(defn_decl_ctx, die); 1074 return type_sp; 1075 } 1076 } 1077 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(), 1078 DW_TAG_value_to_name(tag), type_name_cstr); 1079 1080 CompilerType enumerator_clang_type; 1081 clang_type.SetCompilerType( 1082 &m_ast, 1083 dwarf->GetForwardDeclDieToClangType().lookup(die.GetDIE())); 1084 if (!clang_type) { 1085 if (encoding_form.IsValid()) { 1086 Type *enumerator_type = 1087 dwarf->ResolveTypeUID(DIERef(encoding_form)); 1088 if (enumerator_type) 1089 enumerator_clang_type = enumerator_type->GetFullCompilerType(); 1090 } 1091 1092 if (!enumerator_clang_type) { 1093 if (byte_size) { 1094 enumerator_clang_type = 1095 m_ast.GetBuiltinTypeForDWARFEncodingAndBitSize( 1096 NULL, DW_ATE_signed, *byte_size * 8); 1097 } else { 1098 enumerator_clang_type = m_ast.GetBasicType(eBasicTypeInt); 1099 } 1100 } 1101 1102 clang_type = m_ast.CreateEnumerationType( 1103 type_name_cstr, GetClangDeclContextContainingDIE(die, nullptr), 1104 decl, enumerator_clang_type, is_scoped); 1105 } else { 1106 enumerator_clang_type = 1107 m_ast.GetEnumerationIntegerType(clang_type.GetOpaqueQualType()); 1108 } 1109 1110 LinkDeclContextToDIE( 1111 ClangASTContext::GetDeclContextForType(clang_type), die); 1112 1113 type_sp = std::make_shared<Type>( 1114 die.GetID(), dwarf, type_name_const_str, byte_size, nullptr, 1115 dwarf->GetUID(DIERef(encoding_form)), Type::eEncodingIsUID, &decl, 1116 clang_type, Type::eResolveStateForward); 1117 1118 if (ClangASTContext::StartTagDeclarationDefinition(clang_type)) { 1119 if (die.HasChildren()) { 1120 SymbolContext cu_sc(die.GetLLDBCompileUnit()); 1121 bool is_signed = false; 1122 enumerator_clang_type.IsIntegerType(is_signed); 1123 ParseChildEnumerators(cu_sc, clang_type, is_signed, 1124 type_sp->GetByteSize().getValueOr(0), die); 1125 } 1126 ClangASTContext::CompleteTagDeclarationDefinition(clang_type); 1127 } else { 1128 dwarf->GetObjectFile()->GetModule()->ReportError( 1129 "DWARF DIE at 0x%8.8x named \"%s\" was not able to start its " 1130 "definition.\nPlease file a bug and attach the file at the " 1131 "start of this error message", 1132 die.GetOffset(), type_name_cstr); 1133 } 1134 } 1135 } break; 1136 1137 case DW_TAG_inlined_subroutine: 1138 case DW_TAG_subprogram: 1139 case DW_TAG_subroutine_type: { 1140 // Set a bit that lets us know that we are currently parsing this 1141 dwarf->GetDIEToType()[die.GetDIE()] = DIE_IS_BEING_PARSED; 1142 1143 DWARFFormValue type_die_form; 1144 bool is_variadic = false; 1145 bool is_inline = false; 1146 bool is_static = false; 1147 bool is_virtual = false; 1148 bool is_explicit = false; 1149 bool is_artificial = false; 1150 bool has_template_params = false; 1151 DWARFFormValue specification_die_form; 1152 DWARFFormValue abstract_origin_die_form; 1153 DWARFDIE object_pointer_die; 1154 1155 unsigned type_quals = 0; 1156 clang::StorageClass storage = 1157 clang::SC_None; //, Extern, Static, PrivateExtern 1158 1159 const size_t num_attributes = die.GetAttributes(attributes); 1160 if (num_attributes > 0) { 1161 uint32_t i; 1162 for (i = 0; i < num_attributes; ++i) { 1163 attr = attributes.AttributeAtIndex(i); 1164 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 1165 switch (attr) { 1166 case DW_AT_decl_file: 1167 decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex( 1168 form_value.Unsigned())); 1169 break; 1170 case DW_AT_decl_line: 1171 decl.SetLine(form_value.Unsigned()); 1172 break; 1173 case DW_AT_decl_column: 1174 decl.SetColumn(form_value.Unsigned()); 1175 break; 1176 case DW_AT_name: 1177 type_name_cstr = form_value.AsCString(); 1178 type_name_const_str.SetCString(type_name_cstr); 1179 break; 1180 1181 case DW_AT_linkage_name: 1182 case DW_AT_MIPS_linkage_name: 1183 mangled_name_cstr = form_value.AsCString(); 1184 break; 1185 case DW_AT_type: 1186 type_die_form = form_value; 1187 break; 1188 case DW_AT_accessibility: 1189 accessibility = DW_ACCESS_to_AccessType(form_value.Unsigned()); 1190 break; 1191 case DW_AT_declaration: 1192 break; // is_forward_declaration = form_value.Boolean(); break; 1193 case DW_AT_inline: 1194 is_inline = form_value.Boolean(); 1195 break; 1196 case DW_AT_virtuality: 1197 is_virtual = form_value.Boolean(); 1198 break; 1199 case DW_AT_explicit: 1200 is_explicit = form_value.Boolean(); 1201 break; 1202 case DW_AT_artificial: 1203 is_artificial = form_value.Boolean(); 1204 break; 1205 1206 case DW_AT_external: 1207 if (form_value.Unsigned()) { 1208 if (storage == clang::SC_None) 1209 storage = clang::SC_Extern; 1210 else 1211 storage = clang::SC_PrivateExtern; 1212 } 1213 break; 1214 1215 case DW_AT_specification: 1216 specification_die_form = form_value; 1217 break; 1218 1219 case DW_AT_abstract_origin: 1220 abstract_origin_die_form = form_value; 1221 break; 1222 1223 case DW_AT_object_pointer: 1224 object_pointer_die = form_value.Reference(); 1225 break; 1226 1227 case DW_AT_allocated: 1228 case DW_AT_associated: 1229 case DW_AT_address_class: 1230 case DW_AT_calling_convention: 1231 case DW_AT_data_location: 1232 case DW_AT_elemental: 1233 case DW_AT_entry_pc: 1234 case DW_AT_frame_base: 1235 case DW_AT_high_pc: 1236 case DW_AT_low_pc: 1237 case DW_AT_prototyped: 1238 case DW_AT_pure: 1239 case DW_AT_ranges: 1240 case DW_AT_recursive: 1241 case DW_AT_return_addr: 1242 case DW_AT_segment: 1243 case DW_AT_start_scope: 1244 case DW_AT_static_link: 1245 case DW_AT_trampoline: 1246 case DW_AT_visibility: 1247 case DW_AT_vtable_elem_location: 1248 case DW_AT_description: 1249 case DW_AT_sibling: 1250 break; 1251 } 1252 } 1253 } 1254 } 1255 1256 std::string object_pointer_name; 1257 if (object_pointer_die) { 1258 const char *object_pointer_name_cstr = object_pointer_die.GetName(); 1259 if (object_pointer_name_cstr) 1260 object_pointer_name = object_pointer_name_cstr; 1261 } 1262 1263 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(), 1264 DW_TAG_value_to_name(tag), type_name_cstr); 1265 1266 CompilerType return_clang_type; 1267 Type *func_type = NULL; 1268 1269 if (type_die_form.IsValid()) 1270 func_type = dwarf->ResolveTypeUID(DIERef(type_die_form)); 1271 1272 if (func_type) 1273 return_clang_type = func_type->GetForwardCompilerType(); 1274 else 1275 return_clang_type = m_ast.GetBasicType(eBasicTypeVoid); 1276 1277 std::vector<CompilerType> function_param_types; 1278 std::vector<clang::ParmVarDecl *> function_param_decls; 1279 1280 // Parse the function children for the parameters 1281 1282 DWARFDIE decl_ctx_die; 1283 clang::DeclContext *containing_decl_ctx = 1284 GetClangDeclContextContainingDIE(die, &decl_ctx_die); 1285 const clang::Decl::Kind containing_decl_kind = 1286 containing_decl_ctx->getDeclKind(); 1287 1288 bool is_cxx_method = DeclKindIsCXXClass(containing_decl_kind); 1289 // Start off static. This will be set to false in 1290 // ParseChildParameters(...) if we find a "this" parameters as the 1291 // first parameter 1292 if (is_cxx_method) { 1293 is_static = true; 1294 } 1295 1296 if (die.HasChildren()) { 1297 bool skip_artificial = true; 1298 ParseChildParameters(*sc.comp_unit, containing_decl_ctx, die, 1299 skip_artificial, is_static, is_variadic, 1300 has_template_params, function_param_types, 1301 function_param_decls, type_quals); 1302 } 1303 1304 bool ignore_containing_context = false; 1305 // Check for templatized class member functions. If we had any 1306 // DW_TAG_template_type_parameter or DW_TAG_template_value_parameter 1307 // the DW_TAG_subprogram DIE, then we can't let this become a method in 1308 // a class. Why? Because templatized functions are only emitted if one 1309 // of the templatized methods is used in the current compile unit and 1310 // we will end up with classes that may or may not include these member 1311 // functions and this means one class won't match another class 1312 // definition and it affects our ability to use a class in the clang 1313 // expression parser. So for the greater good, we currently must not 1314 // allow any template member functions in a class definition. 1315 if (is_cxx_method && has_template_params) { 1316 ignore_containing_context = true; 1317 is_cxx_method = false; 1318 } 1319 1320 // clang_type will get the function prototype clang type after this 1321 // call 1322 clang_type = m_ast.CreateFunctionType( 1323 return_clang_type, function_param_types.data(), 1324 function_param_types.size(), is_variadic, type_quals); 1325 1326 if (type_name_cstr) { 1327 bool type_handled = false; 1328 if (tag == DW_TAG_subprogram || tag == DW_TAG_inlined_subroutine) { 1329 ObjCLanguage::MethodName objc_method(type_name_cstr, true); 1330 if (objc_method.IsValid(true)) { 1331 CompilerType class_opaque_type; 1332 ConstString class_name(objc_method.GetClassName()); 1333 if (class_name) { 1334 TypeSP complete_objc_class_type_sp( 1335 dwarf->FindCompleteObjCDefinitionTypeForDIE( 1336 DWARFDIE(), class_name, false)); 1337 1338 if (complete_objc_class_type_sp) { 1339 CompilerType type_clang_forward_type = 1340 complete_objc_class_type_sp->GetForwardCompilerType(); 1341 if (ClangASTContext::IsObjCObjectOrInterfaceType( 1342 type_clang_forward_type)) 1343 class_opaque_type = type_clang_forward_type; 1344 } 1345 } 1346 1347 if (class_opaque_type) { 1348 // If accessibility isn't set to anything valid, assume public 1349 // for now... 1350 if (accessibility == eAccessNone) 1351 accessibility = eAccessPublic; 1352 1353 clang::ObjCMethodDecl *objc_method_decl = 1354 m_ast.AddMethodToObjCObjectType( 1355 class_opaque_type, type_name_cstr, clang_type, 1356 accessibility, is_artificial, is_variadic); 1357 type_handled = objc_method_decl != NULL; 1358 if (type_handled) { 1359 LinkDeclContextToDIE( 1360 ClangASTContext::GetAsDeclContext(objc_method_decl), die); 1361 m_ast.SetMetadataAsUserID(objc_method_decl, die.GetID()); 1362 } else { 1363 dwarf->GetObjectFile()->GetModule()->ReportError( 1364 "{0x%8.8x}: invalid Objective-C method 0x%4.4x (%s), " 1365 "please file a bug and attach the file at the start of " 1366 "this error message", 1367 die.GetOffset(), tag, DW_TAG_value_to_name(tag)); 1368 } 1369 } 1370 } else if (is_cxx_method) { 1371 // Look at the parent of this DIE and see if is is a class or 1372 // struct and see if this is actually a C++ method 1373 Type *class_type = dwarf->ResolveType(decl_ctx_die); 1374 if (class_type) { 1375 bool alternate_defn = false; 1376 if (class_type->GetID() != decl_ctx_die.GetID() || 1377 decl_ctx_die.GetContainingDWOModuleDIE()) { 1378 alternate_defn = true; 1379 1380 // We uniqued the parent class of this function to another 1381 // class so we now need to associate all dies under 1382 // "decl_ctx_die" to DIEs in the DIE for "class_type"... 1383 DWARFDIE class_type_die = dwarf->GetDIE(class_type->GetID()); 1384 1385 if (class_type_die) { 1386 std::vector<DWARFDIE> failures; 1387 1388 CopyUniqueClassMethodTypes(decl_ctx_die, class_type_die, 1389 class_type, failures); 1390 1391 // FIXME do something with these failures that's smarter 1392 // than 1393 // just dropping them on the ground. Unfortunately classes 1394 // don't like having stuff added to them after their 1395 // definitions are complete... 1396 1397 type_ptr = dwarf->GetDIEToType()[die.GetDIE()]; 1398 if (type_ptr && type_ptr != DIE_IS_BEING_PARSED) { 1399 type_sp = type_ptr->shared_from_this(); 1400 break; 1401 } 1402 } 1403 } 1404 1405 if (specification_die_form.IsValid()) { 1406 // We have a specification which we are going to base our 1407 // function prototype off of, so we need this type to be 1408 // completed so that the m_die_to_decl_ctx for the method in 1409 // the specification has a valid clang decl context. 1410 class_type->GetForwardCompilerType(); 1411 // If we have a specification, then the function type should 1412 // have been made with the specification and not with this 1413 // die. 1414 DWARFDIE spec_die = dwarf->DebugInfo()->GetDIE( 1415 DIERef(specification_die_form)); 1416 clang::DeclContext *spec_clang_decl_ctx = 1417 GetClangDeclContextForDIE(spec_die); 1418 if (spec_clang_decl_ctx) { 1419 LinkDeclContextToDIE(spec_clang_decl_ctx, die); 1420 } else { 1421 dwarf->GetObjectFile()->GetModule()->ReportWarning( 1422 "0x%8.8" PRIx64 ": DW_AT_specification(0x%8.8x" 1423 ") has no decl\n", 1424 die.GetID(), 1425 specification_die_form.Reference().GetOffset()); 1426 } 1427 type_handled = true; 1428 } else if (abstract_origin_die_form.IsValid()) { 1429 // We have a specification which we are going to base our 1430 // function prototype off of, so we need this type to be 1431 // completed so that the m_die_to_decl_ctx for the method in 1432 // the abstract origin has a valid clang decl context. 1433 class_type->GetForwardCompilerType(); 1434 1435 DWARFDIE abs_die = dwarf->DebugInfo()->GetDIE( 1436 DIERef(abstract_origin_die_form)); 1437 clang::DeclContext *abs_clang_decl_ctx = 1438 GetClangDeclContextForDIE(abs_die); 1439 if (abs_clang_decl_ctx) { 1440 LinkDeclContextToDIE(abs_clang_decl_ctx, die); 1441 } else { 1442 dwarf->GetObjectFile()->GetModule()->ReportWarning( 1443 "0x%8.8" PRIx64 ": DW_AT_abstract_origin(0x%8.8x" 1444 ") has no decl\n", 1445 die.GetID(), 1446 abstract_origin_die_form.Reference().GetOffset()); 1447 } 1448 type_handled = true; 1449 } else { 1450 CompilerType class_opaque_type = 1451 class_type->GetForwardCompilerType(); 1452 if (ClangASTContext::IsCXXClassType(class_opaque_type)) { 1453 if (class_opaque_type.IsBeingDefined() || alternate_defn) { 1454 if (!is_static && !die.HasChildren()) { 1455 // We have a C++ member function with no children (this 1456 // pointer!) and clang will get mad if we try and make 1457 // a function that isn't well formed in the DWARF, so 1458 // we will just skip it... 1459 type_handled = true; 1460 } else { 1461 bool add_method = true; 1462 if (alternate_defn) { 1463 // If an alternate definition for the class exists, 1464 // then add the method only if an equivalent is not 1465 // already present. 1466 clang::CXXRecordDecl *record_decl = 1467 m_ast.GetAsCXXRecordDecl( 1468 class_opaque_type.GetOpaqueQualType()); 1469 if (record_decl) { 1470 for (auto method_iter = record_decl->method_begin(); 1471 method_iter != record_decl->method_end(); 1472 method_iter++) { 1473 clang::CXXMethodDecl *method_decl = *method_iter; 1474 if (method_decl->getNameInfo().getAsString() == 1475 std::string(type_name_cstr)) { 1476 if (method_decl->getType() == 1477 ClangUtil::GetQualType(clang_type)) { 1478 add_method = false; 1479 LinkDeclContextToDIE( 1480 ClangASTContext::GetAsDeclContext( 1481 method_decl), 1482 die); 1483 type_handled = true; 1484 1485 break; 1486 } 1487 } 1488 } 1489 } 1490 } 1491 1492 if (add_method) { 1493 llvm::PrettyStackTraceFormat stack_trace( 1494 "SymbolFileDWARF::ParseType() is adding a method " 1495 "%s to class %s in DIE 0x%8.8" PRIx64 " from %s", 1496 type_name_cstr, 1497 class_type->GetName().GetCString(), die.GetID(), 1498 dwarf->GetObjectFile() 1499 ->GetFileSpec() 1500 .GetPath() 1501 .c_str()); 1502 1503 const bool is_attr_used = false; 1504 // Neither GCC 4.2 nor clang++ currently set a valid 1505 // accessibility in the DWARF for C++ methods... 1506 // Default to public for now... 1507 if (accessibility == eAccessNone) 1508 accessibility = eAccessPublic; 1509 1510 clang::CXXMethodDecl *cxx_method_decl = 1511 m_ast.AddMethodToCXXRecordType( 1512 class_opaque_type.GetOpaqueQualType(), 1513 type_name_cstr, mangled_name_cstr, clang_type, 1514 accessibility, is_virtual, is_static, 1515 is_inline, is_explicit, is_attr_used, 1516 is_artificial); 1517 1518 type_handled = cxx_method_decl != NULL; 1519 1520 if (type_handled) { 1521 LinkDeclContextToDIE( 1522 ClangASTContext::GetAsDeclContext( 1523 cxx_method_decl), 1524 die); 1525 1526 ClangASTMetadata metadata; 1527 metadata.SetUserID(die.GetID()); 1528 1529 if (!object_pointer_name.empty()) { 1530 metadata.SetObjectPtrName( 1531 object_pointer_name.c_str()); 1532 if (log) 1533 log->Printf( 1534 "Setting object pointer name: %s on method " 1535 "object %p.\n", 1536 object_pointer_name.c_str(), 1537 static_cast<void *>(cxx_method_decl)); 1538 } 1539 m_ast.SetMetadata(cxx_method_decl, metadata); 1540 } else { 1541 ignore_containing_context = true; 1542 } 1543 } 1544 } 1545 } else { 1546 // We were asked to parse the type for a method in a 1547 // class, yet the class hasn't been asked to complete 1548 // itself through the clang::ExternalASTSource protocol, 1549 // so we need to just have the class complete itself and 1550 // do things the right way, then our 1551 // DIE should then have an entry in the 1552 // dwarf->GetDIEToType() map. First 1553 // we need to modify the dwarf->GetDIEToType() so it 1554 // doesn't think we are trying to parse this DIE 1555 // anymore... 1556 dwarf->GetDIEToType()[die.GetDIE()] = NULL; 1557 1558 // Now we get the full type to force our class type to 1559 // complete itself using the clang::ExternalASTSource 1560 // protocol which will parse all base classes and all 1561 // methods (including the method for this DIE). 1562 class_type->GetFullCompilerType(); 1563 1564 // The type for this DIE should have been filled in the 1565 // function call above 1566 type_ptr = dwarf->GetDIEToType()[die.GetDIE()]; 1567 if (type_ptr && type_ptr != DIE_IS_BEING_PARSED) { 1568 type_sp = type_ptr->shared_from_this(); 1569 break; 1570 } 1571 1572 // FIXME This is fixing some even uglier behavior but we 1573 // really need to 1574 // uniq the methods of each class as well as the class 1575 // itself. <rdar://problem/11240464> 1576 type_handled = true; 1577 } 1578 } 1579 } 1580 } 1581 } 1582 } 1583 1584 if (!type_handled) { 1585 clang::FunctionDecl *function_decl = nullptr; 1586 clang::FunctionDecl *template_function_decl = nullptr; 1587 1588 if (abstract_origin_die_form.IsValid()) { 1589 DWARFDIE abs_die = abstract_origin_die_form.Reference(); 1590 1591 SymbolContext sc; 1592 1593 if (dwarf->ResolveType(abs_die)) { 1594 function_decl = llvm::dyn_cast_or_null<clang::FunctionDecl>( 1595 GetCachedClangDeclContextForDIE(abs_die)); 1596 1597 if (function_decl) { 1598 LinkDeclContextToDIE(function_decl, die); 1599 } 1600 } 1601 } 1602 1603 if (!function_decl) { 1604 // We just have a function that isn't part of a class 1605 function_decl = m_ast.CreateFunctionDeclaration( 1606 ignore_containing_context ? m_ast.GetTranslationUnitDecl() 1607 : containing_decl_ctx, 1608 type_name_cstr, clang_type, storage, is_inline); 1609 1610 if (has_template_params) { 1611 ClangASTContext::TemplateParameterInfos template_param_infos; 1612 ParseTemplateParameterInfos(die, template_param_infos); 1613 template_function_decl = m_ast.CreateFunctionDeclaration( 1614 ignore_containing_context ? m_ast.GetTranslationUnitDecl() 1615 : containing_decl_ctx, 1616 type_name_cstr, clang_type, storage, is_inline); 1617 clang::FunctionTemplateDecl *func_template_decl = 1618 m_ast.CreateFunctionTemplateDecl( 1619 containing_decl_ctx, template_function_decl, 1620 type_name_cstr, template_param_infos); 1621 m_ast.CreateFunctionTemplateSpecializationInfo( 1622 function_decl, func_template_decl, template_param_infos); 1623 } 1624 1625 lldbassert(function_decl); 1626 1627 if (function_decl) { 1628 LinkDeclContextToDIE(function_decl, die); 1629 1630 if (!function_param_decls.empty()) { 1631 m_ast.SetFunctionParameters(function_decl, 1632 &function_param_decls.front(), 1633 function_param_decls.size()); 1634 if (template_function_decl) 1635 m_ast.SetFunctionParameters(template_function_decl, 1636 &function_param_decls.front(), 1637 function_param_decls.size()); 1638 } 1639 1640 ClangASTMetadata metadata; 1641 metadata.SetUserID(die.GetID()); 1642 1643 if (!object_pointer_name.empty()) { 1644 metadata.SetObjectPtrName(object_pointer_name.c_str()); 1645 if (log) 1646 log->Printf("Setting object pointer name: %s on function " 1647 "object %p.", 1648 object_pointer_name.c_str(), 1649 static_cast<void *>(function_decl)); 1650 } 1651 m_ast.SetMetadata(function_decl, metadata); 1652 } 1653 } 1654 } 1655 } 1656 type_sp = std::make_shared<Type>( 1657 die.GetID(), dwarf, type_name_const_str, llvm::None, nullptr, 1658 LLDB_INVALID_UID, Type::eEncodingIsUID, &decl, clang_type, 1659 Type::eResolveStateFull); 1660 assert(type_sp.get()); 1661 } break; 1662 1663 case DW_TAG_array_type: { 1664 // Set a bit that lets us know that we are currently parsing this 1665 dwarf->GetDIEToType()[die.GetDIE()] = DIE_IS_BEING_PARSED; 1666 1667 DWARFFormValue type_die_form; 1668 uint32_t byte_stride = 0; 1669 uint32_t bit_stride = 0; 1670 bool is_vector = false; 1671 const size_t num_attributes = die.GetAttributes(attributes); 1672 1673 if (num_attributes > 0) { 1674 uint32_t i; 1675 for (i = 0; i < num_attributes; ++i) { 1676 attr = attributes.AttributeAtIndex(i); 1677 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 1678 switch (attr) { 1679 case DW_AT_decl_file: 1680 decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex( 1681 form_value.Unsigned())); 1682 break; 1683 case DW_AT_decl_line: 1684 decl.SetLine(form_value.Unsigned()); 1685 break; 1686 case DW_AT_decl_column: 1687 decl.SetColumn(form_value.Unsigned()); 1688 break; 1689 case DW_AT_name: 1690 type_name_cstr = form_value.AsCString(); 1691 type_name_const_str.SetCString(type_name_cstr); 1692 break; 1693 1694 case DW_AT_type: 1695 type_die_form = form_value; 1696 break; 1697 case DW_AT_byte_size: 1698 break; // byte_size = form_value.Unsigned(); break; 1699 case DW_AT_byte_stride: 1700 byte_stride = form_value.Unsigned(); 1701 break; 1702 case DW_AT_bit_stride: 1703 bit_stride = form_value.Unsigned(); 1704 break; 1705 case DW_AT_GNU_vector: 1706 is_vector = form_value.Boolean(); 1707 break; 1708 case DW_AT_accessibility: 1709 break; // accessibility = 1710 // DW_ACCESS_to_AccessType(form_value.Unsigned()); break; 1711 case DW_AT_declaration: 1712 break; // is_forward_declaration = form_value.Boolean(); break; 1713 case DW_AT_allocated: 1714 case DW_AT_associated: 1715 case DW_AT_data_location: 1716 case DW_AT_description: 1717 case DW_AT_ordering: 1718 case DW_AT_start_scope: 1719 case DW_AT_visibility: 1720 case DW_AT_specification: 1721 case DW_AT_abstract_origin: 1722 case DW_AT_sibling: 1723 break; 1724 } 1725 } 1726 } 1727 1728 DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(), 1729 DW_TAG_value_to_name(tag), type_name_cstr); 1730 1731 DIERef type_die_ref(type_die_form); 1732 Type *element_type = dwarf->ResolveTypeUID(type_die_ref); 1733 1734 if (element_type) { 1735 auto array_info = ParseChildArrayInfo(die); 1736 if (array_info) { 1737 byte_stride = array_info->byte_stride; 1738 bit_stride = array_info->bit_stride; 1739 } 1740 if (byte_stride == 0 && bit_stride == 0) 1741 byte_stride = element_type->GetByteSize().getValueOr(0); 1742 CompilerType array_element_type = 1743 element_type->GetForwardCompilerType(); 1744 1745 if (ClangASTContext::IsCXXClassType(array_element_type) && 1746 !array_element_type.GetCompleteType()) { 1747 ModuleSP module_sp = die.GetModule(); 1748 if (module_sp) { 1749 if (die.GetCU()->GetProducer() == eProducerClang) 1750 module_sp->ReportError( 1751 "DWARF DW_TAG_array_type DIE at 0x%8.8x has a " 1752 "class/union/struct element type DIE 0x%8.8x that is a " 1753 "forward declaration, not a complete definition.\nTry " 1754 "compiling the source file with -fstandalone-debug or " 1755 "disable -gmodules", 1756 die.GetOffset(), type_die_ref.die_offset); 1757 else 1758 module_sp->ReportError( 1759 "DWARF DW_TAG_array_type DIE at 0x%8.8x has a " 1760 "class/union/struct element type DIE 0x%8.8x that is a " 1761 "forward declaration, not a complete definition.\nPlease " 1762 "file a bug against the compiler and include the " 1763 "preprocessed output for %s", 1764 die.GetOffset(), type_die_ref.die_offset, 1765 die.GetLLDBCompileUnit() 1766 ? die.GetLLDBCompileUnit()->GetPath().c_str() 1767 : "the source file"); 1768 } 1769 1770 // We have no choice other than to pretend that the element class 1771 // type is complete. If we don't do this, clang will crash when 1772 // trying to layout the class. Since we provide layout 1773 // assistance, all ivars in this class and other classes will be 1774 // fine, this is the best we can do short of crashing. 1775 if (ClangASTContext::StartTagDeclarationDefinition( 1776 array_element_type)) { 1777 ClangASTContext::CompleteTagDeclarationDefinition( 1778 array_element_type); 1779 } else { 1780 module_sp->ReportError("DWARF DIE at 0x%8.8x was not able to " 1781 "start its definition.\nPlease file a " 1782 "bug and attach the file at the start " 1783 "of this error message", 1784 type_die_ref.die_offset); 1785 } 1786 } 1787 1788 uint64_t array_element_bit_stride = byte_stride * 8 + bit_stride; 1789 if (array_info && array_info->element_orders.size() > 0) { 1790 uint64_t num_elements = 0; 1791 auto end = array_info->element_orders.rend(); 1792 for (auto pos = array_info->element_orders.rbegin(); pos != end; 1793 ++pos) { 1794 num_elements = *pos; 1795 clang_type = m_ast.CreateArrayType(array_element_type, 1796 num_elements, is_vector); 1797 array_element_type = clang_type; 1798 array_element_bit_stride = 1799 num_elements ? array_element_bit_stride * num_elements 1800 : array_element_bit_stride; 1801 } 1802 } else { 1803 clang_type = 1804 m_ast.CreateArrayType(array_element_type, 0, is_vector); 1805 } 1806 ConstString empty_name; 1807 type_sp = std::make_shared<Type>( 1808 die.GetID(), dwarf, empty_name, array_element_bit_stride / 8, 1809 nullptr, dwarf->GetUID(DIERef(type_die_form)), 1810 Type::eEncodingIsUID, &decl, clang_type, 1811 Type::eResolveStateFull); 1812 type_sp->SetEncodingType(element_type); 1813 m_ast.SetMetadataAsUserID(clang_type.GetOpaqueQualType(), 1814 die.GetID()); 1815 } 1816 } 1817 } break; 1818 1819 case DW_TAG_ptr_to_member_type: { 1820 DWARFFormValue type_die_form; 1821 DWARFFormValue containing_type_die_form; 1822 1823 const size_t num_attributes = die.GetAttributes(attributes); 1824 1825 if (num_attributes > 0) { 1826 uint32_t i; 1827 for (i = 0; i < num_attributes; ++i) { 1828 attr = attributes.AttributeAtIndex(i); 1829 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 1830 switch (attr) { 1831 case DW_AT_type: 1832 type_die_form = form_value; 1833 break; 1834 case DW_AT_containing_type: 1835 containing_type_die_form = form_value; 1836 break; 1837 } 1838 } 1839 } 1840 1841 Type *pointee_type = dwarf->ResolveTypeUID(DIERef(type_die_form)); 1842 Type *class_type = 1843 dwarf->ResolveTypeUID(DIERef(containing_type_die_form)); 1844 1845 CompilerType pointee_clang_type = 1846 pointee_type->GetForwardCompilerType(); 1847 CompilerType class_clang_type = class_type->GetLayoutCompilerType(); 1848 1849 clang_type = ClangASTContext::CreateMemberPointerType( 1850 class_clang_type, pointee_clang_type); 1851 1852 if (llvm::Optional<uint64_t> clang_type_size = 1853 clang_type.GetByteSize(nullptr)) { 1854 byte_size = *clang_type_size; 1855 type_sp = std::make_shared<Type>( 1856 die.GetID(), dwarf, type_name_const_str, byte_size, nullptr, 1857 LLDB_INVALID_UID, Type::eEncodingIsUID, nullptr, clang_type, 1858 Type::eResolveStateForward); 1859 } 1860 } 1861 1862 break; 1863 } 1864 default: 1865 dwarf->GetObjectFile()->GetModule()->ReportError( 1866 "{0x%8.8x}: unhandled type tag 0x%4.4x (%s), please file a bug and " 1867 "attach the file at the start of this error message", 1868 die.GetOffset(), tag, DW_TAG_value_to_name(tag)); 1869 break; 1870 } 1871 1872 if (type_sp.get()) { 1873 DWARFDIE sc_parent_die = 1874 SymbolFileDWARF::GetParentSymbolContextDIE(die); 1875 dw_tag_t sc_parent_tag = sc_parent_die.Tag(); 1876 1877 SymbolContextScope *symbol_context_scope = NULL; 1878 if (sc_parent_tag == DW_TAG_compile_unit || 1879 sc_parent_tag == DW_TAG_partial_unit) { 1880 symbol_context_scope = sc.comp_unit; 1881 } else if (sc.function != NULL && sc_parent_die) { 1882 symbol_context_scope = 1883 sc.function->GetBlock(true).FindBlockByID(sc_parent_die.GetID()); 1884 if (symbol_context_scope == NULL) 1885 symbol_context_scope = sc.function; 1886 } 1887 1888 if (symbol_context_scope != NULL) { 1889 type_sp->SetSymbolContextScope(symbol_context_scope); 1890 } 1891 1892 // We are ready to put this type into the uniqued list up at the module 1893 // level 1894 type_list->Insert(type_sp); 1895 1896 dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get(); 1897 } 1898 } else if (type_ptr != DIE_IS_BEING_PARSED) { 1899 type_sp = type_ptr->shared_from_this(); 1900 } 1901 } 1902 return type_sp; 1903 } 1904 1905 // DWARF parsing functions 1906 1907 class DWARFASTParserClang::DelayedAddObjCClassProperty { 1908 public: 1909 DelayedAddObjCClassProperty( 1910 const CompilerType &class_opaque_type, const char *property_name, 1911 const CompilerType &property_opaque_type, // The property type is only 1912 // required if you don't have an 1913 // ivar decl 1914 clang::ObjCIvarDecl *ivar_decl, const char *property_setter_name, 1915 const char *property_getter_name, uint32_t property_attributes, 1916 const ClangASTMetadata *metadata) 1917 : m_class_opaque_type(class_opaque_type), m_property_name(property_name), 1918 m_property_opaque_type(property_opaque_type), m_ivar_decl(ivar_decl), 1919 m_property_setter_name(property_setter_name), 1920 m_property_getter_name(property_getter_name), 1921 m_property_attributes(property_attributes) { 1922 if (metadata != NULL) { 1923 m_metadata_up.reset(new ClangASTMetadata()); 1924 *m_metadata_up = *metadata; 1925 } 1926 } 1927 1928 DelayedAddObjCClassProperty(const DelayedAddObjCClassProperty &rhs) { 1929 *this = rhs; 1930 } 1931 1932 DelayedAddObjCClassProperty & 1933 operator=(const DelayedAddObjCClassProperty &rhs) { 1934 m_class_opaque_type = rhs.m_class_opaque_type; 1935 m_property_name = rhs.m_property_name; 1936 m_property_opaque_type = rhs.m_property_opaque_type; 1937 m_ivar_decl = rhs.m_ivar_decl; 1938 m_property_setter_name = rhs.m_property_setter_name; 1939 m_property_getter_name = rhs.m_property_getter_name; 1940 m_property_attributes = rhs.m_property_attributes; 1941 1942 if (rhs.m_metadata_up) { 1943 m_metadata_up.reset(new ClangASTMetadata()); 1944 *m_metadata_up = *rhs.m_metadata_up; 1945 } 1946 return *this; 1947 } 1948 1949 bool Finalize() { 1950 return ClangASTContext::AddObjCClassProperty( 1951 m_class_opaque_type, m_property_name, m_property_opaque_type, 1952 m_ivar_decl, m_property_setter_name, m_property_getter_name, 1953 m_property_attributes, m_metadata_up.get()); 1954 } 1955 1956 private: 1957 CompilerType m_class_opaque_type; 1958 const char *m_property_name; 1959 CompilerType m_property_opaque_type; 1960 clang::ObjCIvarDecl *m_ivar_decl; 1961 const char *m_property_setter_name; 1962 const char *m_property_getter_name; 1963 uint32_t m_property_attributes; 1964 std::unique_ptr<ClangASTMetadata> m_metadata_up; 1965 }; 1966 1967 bool DWARFASTParserClang::ParseTemplateDIE( 1968 const DWARFDIE &die, 1969 ClangASTContext::TemplateParameterInfos &template_param_infos) { 1970 const dw_tag_t tag = die.Tag(); 1971 bool is_template_template_argument = false; 1972 1973 switch (tag) { 1974 case DW_TAG_GNU_template_parameter_pack: { 1975 template_param_infos.packed_args.reset( 1976 new ClangASTContext::TemplateParameterInfos); 1977 for (DWARFDIE child_die = die.GetFirstChild(); child_die.IsValid(); 1978 child_die = child_die.GetSibling()) { 1979 if (!ParseTemplateDIE(child_die, *template_param_infos.packed_args)) 1980 return false; 1981 } 1982 if (const char *name = die.GetName()) { 1983 template_param_infos.pack_name = name; 1984 } 1985 return true; 1986 } 1987 case DW_TAG_GNU_template_template_param: 1988 is_template_template_argument = true; 1989 LLVM_FALLTHROUGH; 1990 case DW_TAG_template_type_parameter: 1991 case DW_TAG_template_value_parameter: { 1992 DWARFAttributes attributes; 1993 const size_t num_attributes = die.GetAttributes(attributes); 1994 const char *name = nullptr; 1995 const char *template_name = nullptr; 1996 CompilerType clang_type; 1997 uint64_t uval64 = 0; 1998 bool uval64_valid = false; 1999 if (num_attributes > 0) { 2000 DWARFFormValue form_value; 2001 for (size_t i = 0; i < num_attributes; ++i) { 2002 const dw_attr_t attr = attributes.AttributeAtIndex(i); 2003 2004 switch (attr) { 2005 case DW_AT_name: 2006 if (attributes.ExtractFormValueAtIndex(i, form_value)) 2007 name = form_value.AsCString(); 2008 break; 2009 2010 case DW_AT_GNU_template_name: 2011 if (attributes.ExtractFormValueAtIndex(i, form_value)) 2012 template_name = form_value.AsCString(); 2013 break; 2014 2015 case DW_AT_type: 2016 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 2017 Type *lldb_type = die.ResolveTypeUID(DIERef(form_value)); 2018 if (lldb_type) 2019 clang_type = lldb_type->GetForwardCompilerType(); 2020 } 2021 break; 2022 2023 case DW_AT_const_value: 2024 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 2025 uval64_valid = true; 2026 uval64 = form_value.Unsigned(); 2027 } 2028 break; 2029 default: 2030 break; 2031 } 2032 } 2033 2034 clang::ASTContext *ast = m_ast.getASTContext(); 2035 if (!clang_type) 2036 clang_type = m_ast.GetBasicType(eBasicTypeVoid); 2037 2038 if (!is_template_template_argument) { 2039 bool is_signed = false; 2040 if (name && name[0]) 2041 template_param_infos.names.push_back(name); 2042 else 2043 template_param_infos.names.push_back(NULL); 2044 2045 // Get the signed value for any integer or enumeration if available 2046 clang_type.IsIntegerOrEnumerationType(is_signed); 2047 2048 if (tag == DW_TAG_template_value_parameter && uval64_valid) { 2049 llvm::Optional<uint64_t> size = clang_type.GetBitSize(nullptr); 2050 if (!size) 2051 return false; 2052 llvm::APInt apint(*size, uval64, is_signed); 2053 template_param_infos.args.push_back( 2054 clang::TemplateArgument(*ast, llvm::APSInt(apint, !is_signed), 2055 ClangUtil::GetQualType(clang_type))); 2056 } else { 2057 template_param_infos.args.push_back( 2058 clang::TemplateArgument(ClangUtil::GetQualType(clang_type))); 2059 } 2060 } else { 2061 auto *tplt_type = m_ast.CreateTemplateTemplateParmDecl(template_name); 2062 template_param_infos.names.push_back(name); 2063 template_param_infos.args.push_back( 2064 clang::TemplateArgument(clang::TemplateName(tplt_type))); 2065 } 2066 } 2067 } 2068 return true; 2069 2070 default: 2071 break; 2072 } 2073 return false; 2074 } 2075 2076 bool DWARFASTParserClang::ParseTemplateParameterInfos( 2077 const DWARFDIE &parent_die, 2078 ClangASTContext::TemplateParameterInfos &template_param_infos) { 2079 2080 if (!parent_die) 2081 return false; 2082 2083 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 2084 die = die.GetSibling()) { 2085 const dw_tag_t tag = die.Tag(); 2086 2087 switch (tag) { 2088 case DW_TAG_template_type_parameter: 2089 case DW_TAG_template_value_parameter: 2090 case DW_TAG_GNU_template_parameter_pack: 2091 case DW_TAG_GNU_template_template_param: 2092 ParseTemplateDIE(die, template_param_infos); 2093 break; 2094 2095 default: 2096 break; 2097 } 2098 } 2099 if (template_param_infos.args.empty()) 2100 return false; 2101 return template_param_infos.args.size() == template_param_infos.names.size(); 2102 } 2103 2104 bool DWARFASTParserClang::CompleteTypeFromDWARF(const DWARFDIE &die, 2105 lldb_private::Type *type, 2106 CompilerType &clang_type) { 2107 SymbolFileDWARF *dwarf = die.GetDWARF(); 2108 2109 std::lock_guard<std::recursive_mutex> guard( 2110 dwarf->GetObjectFile()->GetModule()->GetMutex()); 2111 2112 // Disable external storage for this type so we don't get anymore 2113 // clang::ExternalASTSource queries for this type. 2114 m_ast.SetHasExternalStorage(clang_type.GetOpaqueQualType(), false); 2115 2116 if (!die) 2117 return false; 2118 2119 #if defined LLDB_CONFIGURATION_DEBUG 2120 // For debugging purposes, the LLDB_DWARF_DONT_COMPLETE_TYPENAMES environment 2121 // variable can be set with one or more typenames separated by ';' 2122 // characters. This will cause this function to not complete any types whose 2123 // names match. 2124 // 2125 // Examples of setting this environment variable: 2126 // 2127 // LLDB_DWARF_DONT_COMPLETE_TYPENAMES=Foo 2128 // LLDB_DWARF_DONT_COMPLETE_TYPENAMES=Foo;Bar;Baz 2129 const char *dont_complete_typenames_cstr = 2130 getenv("LLDB_DWARF_DONT_COMPLETE_TYPENAMES"); 2131 if (dont_complete_typenames_cstr && dont_complete_typenames_cstr[0]) { 2132 const char *die_name = die.GetName(); 2133 if (die_name && die_name[0]) { 2134 const char *match = strstr(dont_complete_typenames_cstr, die_name); 2135 if (match) { 2136 size_t die_name_length = strlen(die_name); 2137 while (match) { 2138 const char separator_char = ';'; 2139 const char next_char = match[die_name_length]; 2140 if (next_char == '\0' || next_char == separator_char) { 2141 if (match == dont_complete_typenames_cstr || 2142 match[-1] == separator_char) 2143 return false; 2144 } 2145 match = strstr(match + 1, die_name); 2146 } 2147 } 2148 } 2149 } 2150 #endif 2151 2152 const dw_tag_t tag = die.Tag(); 2153 2154 Log *log = 2155 nullptr; // (LogChannelDWARF::GetLogIfAny(DWARF_LOG_DEBUG_INFO|DWARF_LOG_TYPE_COMPLETION)); 2156 if (log) 2157 dwarf->GetObjectFile()->GetModule()->LogMessageVerboseBacktrace( 2158 log, "0x%8.8" PRIx64 ": %s '%s' resolving forward declaration...", 2159 die.GetID(), die.GetTagAsCString(), type->GetName().AsCString()); 2160 assert(clang_type); 2161 DWARFAttributes attributes; 2162 switch (tag) { 2163 case DW_TAG_structure_type: 2164 case DW_TAG_union_type: 2165 case DW_TAG_class_type: { 2166 ClangASTImporter::LayoutInfo layout_info; 2167 2168 { 2169 if (die.HasChildren()) { 2170 LanguageType class_language = eLanguageTypeUnknown; 2171 if (ClangASTContext::IsObjCObjectOrInterfaceType(clang_type)) { 2172 class_language = eLanguageTypeObjC; 2173 // For objective C we don't start the definition when the class is 2174 // created. 2175 ClangASTContext::StartTagDeclarationDefinition(clang_type); 2176 } 2177 2178 int tag_decl_kind = -1; 2179 AccessType default_accessibility = eAccessNone; 2180 if (tag == DW_TAG_structure_type) { 2181 tag_decl_kind = clang::TTK_Struct; 2182 default_accessibility = eAccessPublic; 2183 } else if (tag == DW_TAG_union_type) { 2184 tag_decl_kind = clang::TTK_Union; 2185 default_accessibility = eAccessPublic; 2186 } else if (tag == DW_TAG_class_type) { 2187 tag_decl_kind = clang::TTK_Class; 2188 default_accessibility = eAccessPrivate; 2189 } 2190 2191 SymbolContext sc(die.GetLLDBCompileUnit()); 2192 std::vector<std::unique_ptr<clang::CXXBaseSpecifier>> bases; 2193 std::vector<int> member_accessibilities; 2194 bool is_a_class = false; 2195 // Parse members and base classes first 2196 std::vector<DWARFDIE> member_function_dies; 2197 2198 DelayedPropertyList delayed_properties; 2199 ParseChildMembers(sc, die, clang_type, class_language, bases, 2200 member_accessibilities, member_function_dies, 2201 delayed_properties, default_accessibility, is_a_class, 2202 layout_info); 2203 2204 // Now parse any methods if there were any... 2205 for (const DWARFDIE &die : member_function_dies) 2206 dwarf->ResolveType(die); 2207 2208 if (class_language == eLanguageTypeObjC) { 2209 ConstString class_name(clang_type.GetTypeName()); 2210 if (class_name) { 2211 DIEArray method_die_offsets; 2212 dwarf->GetObjCMethodDIEOffsets(class_name, method_die_offsets); 2213 2214 if (!method_die_offsets.empty()) { 2215 DWARFDebugInfo *debug_info = dwarf->DebugInfo(); 2216 2217 const size_t num_matches = method_die_offsets.size(); 2218 for (size_t i = 0; i < num_matches; ++i) { 2219 const DIERef &die_ref = method_die_offsets[i]; 2220 DWARFDIE method_die = debug_info->GetDIE(die_ref); 2221 2222 if (method_die) 2223 method_die.ResolveType(); 2224 } 2225 } 2226 2227 for (DelayedPropertyList::iterator pi = delayed_properties.begin(), 2228 pe = delayed_properties.end(); 2229 pi != pe; ++pi) 2230 pi->Finalize(); 2231 } 2232 } 2233 2234 // If we have a DW_TAG_structure_type instead of a DW_TAG_class_type we 2235 // need to tell the clang type it is actually a class. 2236 if (class_language != eLanguageTypeObjC) { 2237 if (is_a_class && tag_decl_kind != clang::TTK_Class) 2238 m_ast.SetTagTypeKind(ClangUtil::GetQualType(clang_type), 2239 clang::TTK_Class); 2240 } 2241 2242 // Since DW_TAG_structure_type gets used for both classes and 2243 // structures, we may need to set any DW_TAG_member fields to have a 2244 // "private" access if none was specified. When we parsed the child 2245 // members we tracked that actual accessibility value for each 2246 // DW_TAG_member in the "member_accessibilities" array. If the value 2247 // for the member is zero, then it was set to the 2248 // "default_accessibility" which for structs was "public". Below we 2249 // correct this by setting any fields to "private" that weren't 2250 // correctly set. 2251 if (is_a_class && !member_accessibilities.empty()) { 2252 // This is a class and all members that didn't have their access 2253 // specified are private. 2254 m_ast.SetDefaultAccessForRecordFields( 2255 m_ast.GetAsRecordDecl(clang_type), eAccessPrivate, 2256 &member_accessibilities.front(), member_accessibilities.size()); 2257 } 2258 2259 if (!bases.empty()) { 2260 // Make sure all base classes refer to complete types and not forward 2261 // declarations. If we don't do this, clang will crash with an 2262 // assertion in the call to clang_type.TransferBaseClasses() 2263 for (const auto &base_class : bases) { 2264 clang::TypeSourceInfo *type_source_info = 2265 base_class->getTypeSourceInfo(); 2266 if (type_source_info) { 2267 CompilerType base_class_type( 2268 &m_ast, type_source_info->getType().getAsOpaquePtr()); 2269 if (!base_class_type.GetCompleteType()) { 2270 auto module = dwarf->GetObjectFile()->GetModule(); 2271 module->ReportError(":: Class '%s' has a base class '%s' which " 2272 "does not have a complete definition.", 2273 die.GetName(), 2274 base_class_type.GetTypeName().GetCString()); 2275 if (die.GetCU()->GetProducer() == eProducerClang) 2276 module->ReportError(":: Try compiling the source file with " 2277 "-fstandalone-debug."); 2278 2279 // We have no choice other than to pretend that the base class 2280 // is complete. If we don't do this, clang will crash when we 2281 // call setBases() inside of 2282 // "clang_type.TransferBaseClasses()" below. Since we 2283 // provide layout assistance, all ivars in this class and other 2284 // classes will be fine, this is the best we can do short of 2285 // crashing. 2286 if (ClangASTContext::StartTagDeclarationDefinition( 2287 base_class_type)) { 2288 ClangASTContext::CompleteTagDeclarationDefinition( 2289 base_class_type); 2290 } 2291 } 2292 } 2293 } 2294 2295 m_ast.TransferBaseClasses(clang_type.GetOpaqueQualType(), 2296 std::move(bases)); 2297 } 2298 } 2299 } 2300 2301 m_ast.AddMethodOverridesForCXXRecordType(clang_type.GetOpaqueQualType()); 2302 ClangASTContext::BuildIndirectFields(clang_type); 2303 ClangASTContext::CompleteTagDeclarationDefinition(clang_type); 2304 2305 if (!layout_info.field_offsets.empty() || 2306 !layout_info.base_offsets.empty() || 2307 !layout_info.vbase_offsets.empty()) { 2308 if (type) 2309 layout_info.bit_size = type->GetByteSize().getValueOr(0) * 8; 2310 if (layout_info.bit_size == 0) 2311 layout_info.bit_size = 2312 die.GetAttributeValueAsUnsigned(DW_AT_byte_size, 0) * 8; 2313 2314 clang::CXXRecordDecl *record_decl = 2315 m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType()); 2316 if (record_decl) { 2317 if (log) { 2318 ModuleSP module_sp = dwarf->GetObjectFile()->GetModule(); 2319 2320 if (module_sp) { 2321 module_sp->LogMessage( 2322 log, 2323 "ClangASTContext::CompleteTypeFromDWARF (clang_type = %p) " 2324 "caching layout info for record_decl = %p, bit_size = %" PRIu64 2325 ", alignment = %" PRIu64 2326 ", field_offsets[%u], base_offsets[%u], vbase_offsets[%u])", 2327 static_cast<void *>(clang_type.GetOpaqueQualType()), 2328 static_cast<void *>(record_decl), layout_info.bit_size, 2329 layout_info.alignment, 2330 static_cast<uint32_t>(layout_info.field_offsets.size()), 2331 static_cast<uint32_t>(layout_info.base_offsets.size()), 2332 static_cast<uint32_t>(layout_info.vbase_offsets.size())); 2333 2334 uint32_t idx; 2335 { 2336 llvm::DenseMap<const clang::FieldDecl *, uint64_t>::const_iterator 2337 pos, 2338 end = layout_info.field_offsets.end(); 2339 for (idx = 0, pos = layout_info.field_offsets.begin(); pos != end; 2340 ++pos, ++idx) { 2341 module_sp->LogMessage( 2342 log, "ClangASTContext::CompleteTypeFromDWARF (clang_type = " 2343 "%p) field[%u] = { bit_offset=%u, name='%s' }", 2344 static_cast<void *>(clang_type.GetOpaqueQualType()), idx, 2345 static_cast<uint32_t>(pos->second), 2346 pos->first->getNameAsString().c_str()); 2347 } 2348 } 2349 2350 { 2351 llvm::DenseMap<const clang::CXXRecordDecl *, 2352 clang::CharUnits>::const_iterator base_pos, 2353 base_end = layout_info.base_offsets.end(); 2354 for (idx = 0, base_pos = layout_info.base_offsets.begin(); 2355 base_pos != base_end; ++base_pos, ++idx) { 2356 module_sp->LogMessage( 2357 log, "ClangASTContext::CompleteTypeFromDWARF (clang_type = " 2358 "%p) base[%u] = { byte_offset=%u, name='%s' }", 2359 clang_type.GetOpaqueQualType(), idx, 2360 (uint32_t)base_pos->second.getQuantity(), 2361 base_pos->first->getNameAsString().c_str()); 2362 } 2363 } 2364 { 2365 llvm::DenseMap<const clang::CXXRecordDecl *, 2366 clang::CharUnits>::const_iterator vbase_pos, 2367 vbase_end = layout_info.vbase_offsets.end(); 2368 for (idx = 0, vbase_pos = layout_info.vbase_offsets.begin(); 2369 vbase_pos != vbase_end; ++vbase_pos, ++idx) { 2370 module_sp->LogMessage( 2371 log, "ClangASTContext::CompleteTypeFromDWARF (clang_type = " 2372 "%p) vbase[%u] = { byte_offset=%u, name='%s' }", 2373 static_cast<void *>(clang_type.GetOpaqueQualType()), idx, 2374 static_cast<uint32_t>(vbase_pos->second.getQuantity()), 2375 vbase_pos->first->getNameAsString().c_str()); 2376 } 2377 } 2378 } 2379 } 2380 GetClangASTImporter().InsertRecordDecl(record_decl, layout_info); 2381 } 2382 } 2383 } 2384 2385 return (bool)clang_type; 2386 2387 case DW_TAG_enumeration_type: 2388 if (ClangASTContext::StartTagDeclarationDefinition(clang_type)) { 2389 if (die.HasChildren()) { 2390 SymbolContext sc(die.GetLLDBCompileUnit()); 2391 bool is_signed = false; 2392 clang_type.IsIntegerType(is_signed); 2393 ParseChildEnumerators(sc, clang_type, is_signed, 2394 type->GetByteSize().getValueOr(0), die); 2395 } 2396 ClangASTContext::CompleteTagDeclarationDefinition(clang_type); 2397 } 2398 return (bool)clang_type; 2399 2400 default: 2401 assert(false && "not a forward clang type decl!"); 2402 break; 2403 } 2404 2405 return false; 2406 } 2407 2408 std::vector<DWARFDIE> DWARFASTParserClang::GetDIEForDeclContext( 2409 lldb_private::CompilerDeclContext decl_context) { 2410 std::vector<DWARFDIE> result; 2411 for (auto it = m_decl_ctx_to_die.find( 2412 (clang::DeclContext *)decl_context.GetOpaqueDeclContext()); 2413 it != m_decl_ctx_to_die.end(); it++) 2414 result.push_back(it->second); 2415 return result; 2416 } 2417 2418 CompilerDecl DWARFASTParserClang::GetDeclForUIDFromDWARF(const DWARFDIE &die) { 2419 clang::Decl *clang_decl = GetClangDeclForDIE(die); 2420 if (clang_decl != nullptr) 2421 return CompilerDecl(&m_ast, clang_decl); 2422 return CompilerDecl(); 2423 } 2424 2425 CompilerDeclContext 2426 DWARFASTParserClang::GetDeclContextForUIDFromDWARF(const DWARFDIE &die) { 2427 clang::DeclContext *clang_decl_ctx = GetClangDeclContextForDIE(die); 2428 if (clang_decl_ctx) 2429 return CompilerDeclContext(&m_ast, clang_decl_ctx); 2430 return CompilerDeclContext(); 2431 } 2432 2433 CompilerDeclContext 2434 DWARFASTParserClang::GetDeclContextContainingUIDFromDWARF(const DWARFDIE &die) { 2435 clang::DeclContext *clang_decl_ctx = 2436 GetClangDeclContextContainingDIE(die, nullptr); 2437 if (clang_decl_ctx) 2438 return CompilerDeclContext(&m_ast, clang_decl_ctx); 2439 return CompilerDeclContext(); 2440 } 2441 2442 size_t DWARFASTParserClang::ParseChildEnumerators( 2443 const SymbolContext &sc, lldb_private::CompilerType &clang_type, 2444 bool is_signed, uint32_t enumerator_byte_size, const DWARFDIE &parent_die) { 2445 if (!parent_die) 2446 return 0; 2447 2448 size_t enumerators_added = 0; 2449 2450 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 2451 die = die.GetSibling()) { 2452 const dw_tag_t tag = die.Tag(); 2453 if (tag == DW_TAG_enumerator) { 2454 DWARFAttributes attributes; 2455 const size_t num_child_attributes = die.GetAttributes(attributes); 2456 if (num_child_attributes > 0) { 2457 const char *name = NULL; 2458 bool got_value = false; 2459 int64_t enum_value = 0; 2460 Declaration decl; 2461 2462 uint32_t i; 2463 for (i = 0; i < num_child_attributes; ++i) { 2464 const dw_attr_t attr = attributes.AttributeAtIndex(i); 2465 DWARFFormValue form_value; 2466 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 2467 switch (attr) { 2468 case DW_AT_const_value: 2469 got_value = true; 2470 if (is_signed) 2471 enum_value = form_value.Signed(); 2472 else 2473 enum_value = form_value.Unsigned(); 2474 break; 2475 2476 case DW_AT_name: 2477 name = form_value.AsCString(); 2478 break; 2479 2480 case DW_AT_description: 2481 default: 2482 case DW_AT_decl_file: 2483 decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex( 2484 form_value.Unsigned())); 2485 break; 2486 case DW_AT_decl_line: 2487 decl.SetLine(form_value.Unsigned()); 2488 break; 2489 case DW_AT_decl_column: 2490 decl.SetColumn(form_value.Unsigned()); 2491 break; 2492 case DW_AT_sibling: 2493 break; 2494 } 2495 } 2496 } 2497 2498 if (name && name[0] && got_value) { 2499 m_ast.AddEnumerationValueToEnumerationType( 2500 clang_type, decl, name, enum_value, enumerator_byte_size * 8); 2501 ++enumerators_added; 2502 } 2503 } 2504 } 2505 } 2506 return enumerators_added; 2507 } 2508 2509 #if defined(LLDB_CONFIGURATION_DEBUG) || defined(LLDB_CONFIGURATION_RELEASE) 2510 2511 class DIEStack { 2512 public: 2513 void Push(const DWARFDIE &die) { m_dies.push_back(die); } 2514 2515 void LogDIEs(Log *log) { 2516 StreamString log_strm; 2517 const size_t n = m_dies.size(); 2518 log_strm.Printf("DIEStack[%" PRIu64 "]:\n", (uint64_t)n); 2519 for (size_t i = 0; i < n; i++) { 2520 std::string qualified_name; 2521 const DWARFDIE &die = m_dies[i]; 2522 die.GetQualifiedName(qualified_name); 2523 log_strm.Printf("[%" PRIu64 "] 0x%8.8x: %s name='%s'\n", (uint64_t)i, 2524 die.GetOffset(), die.GetTagAsCString(), 2525 qualified_name.c_str()); 2526 } 2527 log->PutCString(log_strm.GetData()); 2528 } 2529 void Pop() { m_dies.pop_back(); } 2530 2531 class ScopedPopper { 2532 public: 2533 ScopedPopper(DIEStack &die_stack) 2534 : m_die_stack(die_stack), m_valid(false) {} 2535 2536 void Push(const DWARFDIE &die) { 2537 m_valid = true; 2538 m_die_stack.Push(die); 2539 } 2540 2541 ~ScopedPopper() { 2542 if (m_valid) 2543 m_die_stack.Pop(); 2544 } 2545 2546 protected: 2547 DIEStack &m_die_stack; 2548 bool m_valid; 2549 }; 2550 2551 protected: 2552 typedef std::vector<DWARFDIE> Stack; 2553 Stack m_dies; 2554 }; 2555 #endif 2556 2557 Function *DWARFASTParserClang::ParseFunctionFromDWARF(CompileUnit &comp_unit, 2558 const DWARFDIE &die) { 2559 DWARFRangeList func_ranges; 2560 const char *name = NULL; 2561 const char *mangled = NULL; 2562 int decl_file = 0; 2563 int decl_line = 0; 2564 int decl_column = 0; 2565 int call_file = 0; 2566 int call_line = 0; 2567 int call_column = 0; 2568 DWARFExpression frame_base(die.GetCU()); 2569 2570 const dw_tag_t tag = die.Tag(); 2571 2572 if (tag != DW_TAG_subprogram) 2573 return NULL; 2574 2575 if (die.GetDIENamesAndRanges(name, mangled, func_ranges, decl_file, decl_line, 2576 decl_column, call_file, call_line, call_column, 2577 &frame_base)) { 2578 2579 // Union of all ranges in the function DIE (if the function is 2580 // discontiguous) 2581 AddressRange func_range; 2582 lldb::addr_t lowest_func_addr = func_ranges.GetMinRangeBase(0); 2583 lldb::addr_t highest_func_addr = func_ranges.GetMaxRangeEnd(0); 2584 if (lowest_func_addr != LLDB_INVALID_ADDRESS && 2585 lowest_func_addr <= highest_func_addr) { 2586 ModuleSP module_sp(die.GetModule()); 2587 func_range.GetBaseAddress().ResolveAddressUsingFileSections( 2588 lowest_func_addr, module_sp->GetSectionList()); 2589 if (func_range.GetBaseAddress().IsValid()) 2590 func_range.SetByteSize(highest_func_addr - lowest_func_addr); 2591 } 2592 2593 if (func_range.GetBaseAddress().IsValid()) { 2594 Mangled func_name; 2595 if (mangled) 2596 func_name.SetValue(ConstString(mangled), true); 2597 else if ((die.GetParent().Tag() == DW_TAG_compile_unit || 2598 die.GetParent().Tag() == DW_TAG_partial_unit) && 2599 Language::LanguageIsCPlusPlus(die.GetLanguage()) && name && 2600 strcmp(name, "main") != 0) { 2601 // If the mangled name is not present in the DWARF, generate the 2602 // demangled name using the decl context. We skip if the function is 2603 // "main" as its name is never mangled. 2604 bool is_static = false; 2605 bool is_variadic = false; 2606 bool has_template_params = false; 2607 unsigned type_quals = 0; 2608 std::vector<CompilerType> param_types; 2609 std::vector<clang::ParmVarDecl *> param_decls; 2610 DWARFDeclContext decl_ctx; 2611 StreamString sstr; 2612 2613 die.GetDWARFDeclContext(decl_ctx); 2614 sstr << decl_ctx.GetQualifiedName(); 2615 2616 clang::DeclContext *containing_decl_ctx = 2617 GetClangDeclContextContainingDIE(die, nullptr); 2618 ParseChildParameters(comp_unit, containing_decl_ctx, die, true, 2619 is_static, is_variadic, has_template_params, 2620 param_types, param_decls, type_quals); 2621 sstr << "("; 2622 for (size_t i = 0; i < param_types.size(); i++) { 2623 if (i > 0) 2624 sstr << ", "; 2625 sstr << param_types[i].GetTypeName(); 2626 } 2627 if (is_variadic) 2628 sstr << ", ..."; 2629 sstr << ")"; 2630 if (type_quals & clang::Qualifiers::Const) 2631 sstr << " const"; 2632 2633 func_name.SetValue(ConstString(sstr.GetString()), false); 2634 } else 2635 func_name.SetValue(ConstString(name), false); 2636 2637 FunctionSP func_sp; 2638 std::unique_ptr<Declaration> decl_up; 2639 if (decl_file != 0 || decl_line != 0 || decl_column != 0) 2640 decl_up.reset(new Declaration( 2641 comp_unit.GetSupportFiles().GetFileSpecAtIndex(decl_file), 2642 decl_line, decl_column)); 2643 2644 SymbolFileDWARF *dwarf = die.GetDWARF(); 2645 // Supply the type _only_ if it has already been parsed 2646 Type *func_type = dwarf->GetDIEToType().lookup(die.GetDIE()); 2647 2648 assert(func_type == NULL || func_type != DIE_IS_BEING_PARSED); 2649 2650 if (dwarf->FixupAddress(func_range.GetBaseAddress())) { 2651 const user_id_t func_user_id = die.GetID(); 2652 func_sp = 2653 std::make_shared<Function>(&comp_unit, 2654 func_user_id, // UserID is the DIE offset 2655 func_user_id, func_name, func_type, 2656 func_range); // first address range 2657 2658 if (func_sp.get() != NULL) { 2659 if (frame_base.IsValid()) 2660 func_sp->GetFrameBaseExpression() = frame_base; 2661 comp_unit.AddFunction(func_sp); 2662 return func_sp.get(); 2663 } 2664 } 2665 } 2666 } 2667 return NULL; 2668 } 2669 2670 bool DWARFASTParserClang::ParseChildMembers( 2671 const SymbolContext &sc, const DWARFDIE &parent_die, 2672 CompilerType &class_clang_type, const LanguageType class_language, 2673 std::vector<std::unique_ptr<clang::CXXBaseSpecifier>> &base_classes, 2674 std::vector<int> &member_accessibilities, 2675 std::vector<DWARFDIE> &member_function_dies, 2676 DelayedPropertyList &delayed_properties, AccessType &default_accessibility, 2677 bool &is_a_class, ClangASTImporter::LayoutInfo &layout_info) { 2678 if (!parent_die) 2679 return 0; 2680 2681 // Get the parent byte size so we can verify any members will fit 2682 const uint64_t parent_byte_size = 2683 parent_die.GetAttributeValueAsUnsigned(DW_AT_byte_size, UINT64_MAX); 2684 const uint64_t parent_bit_size = 2685 parent_byte_size == UINT64_MAX ? UINT64_MAX : parent_byte_size * 8; 2686 2687 uint32_t member_idx = 0; 2688 BitfieldInfo last_field_info; 2689 2690 ModuleSP module_sp = parent_die.GetDWARF()->GetObjectFile()->GetModule(); 2691 ClangASTContext *ast = 2692 llvm::dyn_cast_or_null<ClangASTContext>(class_clang_type.GetTypeSystem()); 2693 if (ast == nullptr) 2694 return 0; 2695 2696 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 2697 die = die.GetSibling()) { 2698 dw_tag_t tag = die.Tag(); 2699 2700 switch (tag) { 2701 case DW_TAG_member: 2702 case DW_TAG_APPLE_property: { 2703 DWARFAttributes attributes; 2704 const size_t num_attributes = die.GetAttributes(attributes); 2705 if (num_attributes > 0) { 2706 Declaration decl; 2707 // DWARFExpression location; 2708 const char *name = NULL; 2709 const char *prop_name = NULL; 2710 const char *prop_getter_name = NULL; 2711 const char *prop_setter_name = NULL; 2712 uint32_t prop_attributes = 0; 2713 2714 bool is_artificial = false; 2715 DWARFFormValue encoding_form; 2716 AccessType accessibility = eAccessNone; 2717 uint32_t member_byte_offset = 2718 (parent_die.Tag() == DW_TAG_union_type) ? 0 : UINT32_MAX; 2719 llvm::Optional<uint64_t> byte_size; 2720 int64_t bit_offset = 0; 2721 uint64_t data_bit_offset = UINT64_MAX; 2722 size_t bit_size = 0; 2723 bool is_external = 2724 false; // On DW_TAG_members, this means the member is static 2725 uint32_t i; 2726 for (i = 0; i < num_attributes && !is_artificial; ++i) { 2727 const dw_attr_t attr = attributes.AttributeAtIndex(i); 2728 DWARFFormValue form_value; 2729 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 2730 switch (attr) { 2731 case DW_AT_decl_file: 2732 decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex( 2733 form_value.Unsigned())); 2734 break; 2735 case DW_AT_decl_line: 2736 decl.SetLine(form_value.Unsigned()); 2737 break; 2738 case DW_AT_decl_column: 2739 decl.SetColumn(form_value.Unsigned()); 2740 break; 2741 case DW_AT_name: 2742 name = form_value.AsCString(); 2743 break; 2744 case DW_AT_type: 2745 encoding_form = form_value; 2746 break; 2747 case DW_AT_bit_offset: 2748 bit_offset = form_value.Signed(); 2749 break; 2750 case DW_AT_bit_size: 2751 bit_size = form_value.Unsigned(); 2752 break; 2753 case DW_AT_byte_size: 2754 byte_size = form_value.Unsigned(); 2755 break; 2756 case DW_AT_data_bit_offset: 2757 data_bit_offset = form_value.Unsigned(); 2758 break; 2759 case DW_AT_data_member_location: 2760 if (form_value.BlockData()) { 2761 Value initialValue(0); 2762 Value memberOffset(0); 2763 const DWARFDataExtractor &debug_info_data = die.GetData(); 2764 uint32_t block_length = form_value.Unsigned(); 2765 uint32_t block_offset = 2766 form_value.BlockData() - debug_info_data.GetDataStart(); 2767 if (DWARFExpression::Evaluate( 2768 nullptr, // ExecutionContext * 2769 nullptr, // RegisterContext * 2770 module_sp, debug_info_data, die.GetCU(), block_offset, 2771 block_length, eRegisterKindDWARF, &initialValue, 2772 nullptr, memberOffset, nullptr)) { 2773 member_byte_offset = memberOffset.ResolveValue(NULL).UInt(); 2774 } 2775 } else { 2776 // With DWARF 3 and later, if the value is an integer constant, 2777 // this form value is the offset in bytes from the beginning of 2778 // the containing entity. 2779 member_byte_offset = form_value.Unsigned(); 2780 } 2781 break; 2782 2783 case DW_AT_accessibility: 2784 accessibility = DW_ACCESS_to_AccessType(form_value.Unsigned()); 2785 break; 2786 case DW_AT_artificial: 2787 is_artificial = form_value.Boolean(); 2788 break; 2789 case DW_AT_APPLE_property_name: 2790 prop_name = form_value.AsCString(); 2791 break; 2792 case DW_AT_APPLE_property_getter: 2793 prop_getter_name = form_value.AsCString(); 2794 break; 2795 case DW_AT_APPLE_property_setter: 2796 prop_setter_name = form_value.AsCString(); 2797 break; 2798 case DW_AT_APPLE_property_attribute: 2799 prop_attributes = form_value.Unsigned(); 2800 break; 2801 case DW_AT_external: 2802 is_external = form_value.Boolean(); 2803 break; 2804 2805 default: 2806 case DW_AT_declaration: 2807 case DW_AT_description: 2808 case DW_AT_mutable: 2809 case DW_AT_visibility: 2810 case DW_AT_sibling: 2811 break; 2812 } 2813 } 2814 } 2815 2816 if (prop_name) { 2817 ConstString fixed_getter; 2818 ConstString fixed_setter; 2819 2820 // Check if the property getter/setter were provided as full names. 2821 // We want basenames, so we extract them. 2822 2823 if (prop_getter_name && prop_getter_name[0] == '-') { 2824 ObjCLanguage::MethodName prop_getter_method(prop_getter_name, true); 2825 prop_getter_name = prop_getter_method.GetSelector().GetCString(); 2826 } 2827 2828 if (prop_setter_name && prop_setter_name[0] == '-') { 2829 ObjCLanguage::MethodName prop_setter_method(prop_setter_name, true); 2830 prop_setter_name = prop_setter_method.GetSelector().GetCString(); 2831 } 2832 2833 // If the names haven't been provided, they need to be filled in. 2834 2835 if (!prop_getter_name) { 2836 prop_getter_name = prop_name; 2837 } 2838 if (!prop_setter_name && prop_name[0] && 2839 !(prop_attributes & DW_APPLE_PROPERTY_readonly)) { 2840 StreamString ss; 2841 2842 ss.Printf("set%c%s:", toupper(prop_name[0]), &prop_name[1]); 2843 2844 fixed_setter.SetString(ss.GetString()); 2845 prop_setter_name = fixed_setter.GetCString(); 2846 } 2847 } 2848 2849 // Clang has a DWARF generation bug where sometimes it represents 2850 // fields that are references with bad byte size and bit size/offset 2851 // information such as: 2852 // 2853 // DW_AT_byte_size( 0x00 ) 2854 // DW_AT_bit_size( 0x40 ) 2855 // DW_AT_bit_offset( 0xffffffffffffffc0 ) 2856 // 2857 // So check the bit offset to make sure it is sane, and if the values 2858 // are not sane, remove them. If we don't do this then we will end up 2859 // with a crash if we try to use this type in an expression when clang 2860 // becomes unhappy with its recycled debug info. 2861 2862 if (byte_size.getValueOr(0) == 0 && bit_offset < 0) { 2863 bit_size = 0; 2864 bit_offset = 0; 2865 } 2866 2867 // FIXME: Make Clang ignore Objective-C accessibility for expressions 2868 if (class_language == eLanguageTypeObjC || 2869 class_language == eLanguageTypeObjC_plus_plus) 2870 accessibility = eAccessNone; 2871 2872 // Handle static members 2873 if (is_external && member_byte_offset == UINT32_MAX) { 2874 Type *var_type = die.ResolveTypeUID(DIERef(encoding_form)); 2875 2876 if (var_type) { 2877 if (accessibility == eAccessNone) 2878 accessibility = eAccessPublic; 2879 ClangASTContext::AddVariableToRecordType( 2880 class_clang_type, name, var_type->GetLayoutCompilerType(), 2881 accessibility); 2882 } 2883 break; 2884 } 2885 2886 if (!is_artificial) { 2887 Type *member_type = die.ResolveTypeUID(DIERef(encoding_form)); 2888 2889 clang::FieldDecl *field_decl = NULL; 2890 if (tag == DW_TAG_member) { 2891 if (member_type) { 2892 if (accessibility == eAccessNone) 2893 accessibility = default_accessibility; 2894 member_accessibilities.push_back(accessibility); 2895 2896 uint64_t field_bit_offset = 2897 (member_byte_offset == UINT32_MAX ? 0 2898 : (member_byte_offset * 8)); 2899 if (bit_size > 0) { 2900 2901 BitfieldInfo this_field_info; 2902 this_field_info.bit_offset = field_bit_offset; 2903 this_field_info.bit_size = bit_size; 2904 2905 ///////////////////////////////////////////////////////////// 2906 // How to locate a field given the DWARF debug information 2907 // 2908 // AT_byte_size indicates the size of the word in which the bit 2909 // offset must be interpreted. 2910 // 2911 // AT_data_member_location indicates the byte offset of the 2912 // word from the base address of the structure. 2913 // 2914 // AT_bit_offset indicates how many bits into the word 2915 // (according to the host endianness) the low-order bit of the 2916 // field starts. AT_bit_offset can be negative. 2917 // 2918 // AT_bit_size indicates the size of the field in bits. 2919 ///////////////////////////////////////////////////////////// 2920 2921 if (data_bit_offset != UINT64_MAX) { 2922 this_field_info.bit_offset = data_bit_offset; 2923 } else { 2924 if (!byte_size) 2925 byte_size = member_type->GetByteSize(); 2926 2927 ObjectFile *objfile = die.GetDWARF()->GetObjectFile(); 2928 if (objfile->GetByteOrder() == eByteOrderLittle) { 2929 this_field_info.bit_offset += byte_size.getValueOr(0) * 8; 2930 this_field_info.bit_offset -= (bit_offset + bit_size); 2931 } else { 2932 this_field_info.bit_offset += bit_offset; 2933 } 2934 } 2935 2936 if ((this_field_info.bit_offset >= parent_bit_size) || 2937 !last_field_info.NextBitfieldOffsetIsValid( 2938 this_field_info.bit_offset)) { 2939 ObjectFile *objfile = die.GetDWARF()->GetObjectFile(); 2940 objfile->GetModule()->ReportWarning( 2941 "0x%8.8" PRIx64 ": %s bitfield named \"%s\" has invalid " 2942 "bit offset (0x%8.8" PRIx64 2943 ") member will be ignored. Please file a bug against the " 2944 "compiler and include the preprocessed output for %s\n", 2945 die.GetID(), DW_TAG_value_to_name(tag), name, 2946 this_field_info.bit_offset, 2947 sc.comp_unit ? sc.comp_unit->GetPath().c_str() 2948 : "the source file"); 2949 this_field_info.Clear(); 2950 continue; 2951 } 2952 2953 // Update the field bit offset we will report for layout 2954 field_bit_offset = this_field_info.bit_offset; 2955 2956 // If the member to be emitted did not start on a character 2957 // boundary and there is empty space between the last field and 2958 // this one, then we need to emit an anonymous member filling 2959 // up the space up to its start. There are three cases here: 2960 // 2961 // 1 If the previous member ended on a character boundary, then 2962 // we can emit an 2963 // anonymous member starting at the most recent character 2964 // boundary. 2965 // 2966 // 2 If the previous member did not end on a character boundary 2967 // and the distance 2968 // from the end of the previous member to the current member 2969 // is less than a 2970 // word width, then we can emit an anonymous member starting 2971 // right after the 2972 // previous member and right before this member. 2973 // 2974 // 3 If the previous member did not end on a character boundary 2975 // and the distance 2976 // from the end of the previous member to the current member 2977 // is greater than 2978 // or equal a word width, then we act as in Case 1. 2979 2980 const uint64_t character_width = 8; 2981 const uint64_t word_width = 32; 2982 2983 // Objective-C has invalid DW_AT_bit_offset values in older 2984 // versions of clang, so we have to be careful and only insert 2985 // unnamed bitfields if we have a new enough clang. 2986 bool detect_unnamed_bitfields = true; 2987 2988 if (class_language == eLanguageTypeObjC || 2989 class_language == eLanguageTypeObjC_plus_plus) 2990 detect_unnamed_bitfields = 2991 die.GetCU()->Supports_unnamed_objc_bitfields(); 2992 2993 if (detect_unnamed_bitfields) { 2994 BitfieldInfo anon_field_info; 2995 2996 if ((this_field_info.bit_offset % character_width) != 2997 0) // not char aligned 2998 { 2999 uint64_t last_field_end = 0; 3000 3001 if (last_field_info.IsValid()) 3002 last_field_end = 3003 last_field_info.bit_offset + last_field_info.bit_size; 3004 3005 if (this_field_info.bit_offset != last_field_end) { 3006 if (((last_field_end % character_width) == 0) || // case 1 3007 (this_field_info.bit_offset - last_field_end >= 3008 word_width)) // case 3 3009 { 3010 anon_field_info.bit_size = 3011 this_field_info.bit_offset % character_width; 3012 anon_field_info.bit_offset = 3013 this_field_info.bit_offset - 3014 anon_field_info.bit_size; 3015 } else // case 2 3016 { 3017 anon_field_info.bit_size = 3018 this_field_info.bit_offset - last_field_end; 3019 anon_field_info.bit_offset = last_field_end; 3020 } 3021 } 3022 } 3023 3024 if (anon_field_info.IsValid()) { 3025 clang::FieldDecl *unnamed_bitfield_decl = 3026 ClangASTContext::AddFieldToRecordType( 3027 class_clang_type, llvm::StringRef(), 3028 m_ast.GetBuiltinTypeForEncodingAndBitSize( 3029 eEncodingSint, word_width), 3030 accessibility, anon_field_info.bit_size); 3031 3032 layout_info.field_offsets.insert(std::make_pair( 3033 unnamed_bitfield_decl, anon_field_info.bit_offset)); 3034 } 3035 } 3036 last_field_info = this_field_info; 3037 } else { 3038 last_field_info.Clear(); 3039 } 3040 3041 CompilerType member_clang_type = 3042 member_type->GetLayoutCompilerType(); 3043 if (!member_clang_type.IsCompleteType()) 3044 member_clang_type.GetCompleteType(); 3045 3046 { 3047 // Older versions of clang emit array[0] and array[1] in the 3048 // same way (<rdar://problem/12566646>). If the current field 3049 // is at the end of the structure, then there is definitely no 3050 // room for extra elements and we override the type to 3051 // array[0]. 3052 3053 CompilerType member_array_element_type; 3054 uint64_t member_array_size; 3055 bool member_array_is_incomplete; 3056 3057 if (member_clang_type.IsArrayType( 3058 &member_array_element_type, &member_array_size, 3059 &member_array_is_incomplete) && 3060 !member_array_is_incomplete) { 3061 uint64_t parent_byte_size = 3062 parent_die.GetAttributeValueAsUnsigned(DW_AT_byte_size, 3063 UINT64_MAX); 3064 3065 if (member_byte_offset >= parent_byte_size) { 3066 if (member_array_size != 1 && 3067 (member_array_size != 0 || 3068 member_byte_offset > parent_byte_size)) { 3069 module_sp->ReportError( 3070 "0x%8.8" PRIx64 3071 ": DW_TAG_member '%s' refers to type 0x%8.8x" 3072 " which extends beyond the bounds of 0x%8.8" PRIx64, 3073 die.GetID(), name, 3074 encoding_form.Reference().GetOffset(), 3075 parent_die.GetID()); 3076 } 3077 3078 member_clang_type = m_ast.CreateArrayType( 3079 member_array_element_type, 0, false); 3080 } 3081 } 3082 } 3083 3084 if (ClangASTContext::IsCXXClassType(member_clang_type) && 3085 !member_clang_type.GetCompleteType()) { 3086 if (die.GetCU()->GetProducer() == eProducerClang) 3087 module_sp->ReportError( 3088 "DWARF DIE at 0x%8.8x (class %s) has a member variable " 3089 "0x%8.8x (%s) whose type is a forward declaration, not a " 3090 "complete definition.\nTry compiling the source file " 3091 "with -fstandalone-debug", 3092 parent_die.GetOffset(), parent_die.GetName(), 3093 die.GetOffset(), name); 3094 else 3095 module_sp->ReportError( 3096 "DWARF DIE at 0x%8.8x (class %s) has a member variable " 3097 "0x%8.8x (%s) whose type is a forward declaration, not a " 3098 "complete definition.\nPlease file a bug against the " 3099 "compiler and include the preprocessed output for %s", 3100 parent_die.GetOffset(), parent_die.GetName(), 3101 die.GetOffset(), name, 3102 sc.comp_unit ? sc.comp_unit->GetPath().c_str() 3103 : "the source file"); 3104 // We have no choice other than to pretend that the member 3105 // class is complete. If we don't do this, clang will crash 3106 // when trying to layout the class. Since we provide layout 3107 // assistance, all ivars in this class and other classes will 3108 // be fine, this is the best we can do short of crashing. 3109 if (ClangASTContext::StartTagDeclarationDefinition( 3110 member_clang_type)) { 3111 ClangASTContext::CompleteTagDeclarationDefinition( 3112 member_clang_type); 3113 } else { 3114 module_sp->ReportError( 3115 "DWARF DIE at 0x%8.8x (class %s) has a member variable " 3116 "0x%8.8x (%s) whose type claims to be a C++ class but we " 3117 "were not able to start its definition.\nPlease file a " 3118 "bug and attach the file at the start of this error " 3119 "message", 3120 parent_die.GetOffset(), parent_die.GetName(), 3121 die.GetOffset(), name); 3122 } 3123 } 3124 3125 field_decl = ClangASTContext::AddFieldToRecordType( 3126 class_clang_type, name, member_clang_type, accessibility, 3127 bit_size); 3128 3129 m_ast.SetMetadataAsUserID(field_decl, die.GetID()); 3130 3131 layout_info.field_offsets.insert( 3132 std::make_pair(field_decl, field_bit_offset)); 3133 } else { 3134 if (name) 3135 module_sp->ReportError( 3136 "0x%8.8" PRIx64 3137 ": DW_TAG_member '%s' refers to type 0x%8.8x" 3138 " which was unable to be parsed", 3139 die.GetID(), name, encoding_form.Reference().GetOffset()); 3140 else 3141 module_sp->ReportError( 3142 "0x%8.8" PRIx64 ": DW_TAG_member refers to type 0x%8.8x" 3143 " which was unable to be parsed", 3144 die.GetID(), encoding_form.Reference().GetOffset()); 3145 } 3146 } 3147 3148 if (prop_name != NULL && member_type) { 3149 clang::ObjCIvarDecl *ivar_decl = NULL; 3150 3151 if (field_decl) { 3152 ivar_decl = clang::dyn_cast<clang::ObjCIvarDecl>(field_decl); 3153 assert(ivar_decl != NULL); 3154 } 3155 3156 ClangASTMetadata metadata; 3157 metadata.SetUserID(die.GetID()); 3158 delayed_properties.push_back(DelayedAddObjCClassProperty( 3159 class_clang_type, prop_name, 3160 member_type->GetLayoutCompilerType(), ivar_decl, 3161 prop_setter_name, prop_getter_name, prop_attributes, 3162 &metadata)); 3163 3164 if (ivar_decl) 3165 m_ast.SetMetadataAsUserID(ivar_decl, die.GetID()); 3166 } 3167 } 3168 } 3169 ++member_idx; 3170 } break; 3171 3172 case DW_TAG_subprogram: 3173 // Let the type parsing code handle this one for us. 3174 member_function_dies.push_back(die); 3175 break; 3176 3177 case DW_TAG_inheritance: { 3178 is_a_class = true; 3179 if (default_accessibility == eAccessNone) 3180 default_accessibility = eAccessPrivate; 3181 // TODO: implement DW_TAG_inheritance type parsing 3182 DWARFAttributes attributes; 3183 const size_t num_attributes = die.GetAttributes(attributes); 3184 if (num_attributes > 0) { 3185 Declaration decl; 3186 DWARFExpression location(die.GetCU()); 3187 DWARFFormValue encoding_form; 3188 AccessType accessibility = default_accessibility; 3189 bool is_virtual = false; 3190 bool is_base_of_class = true; 3191 off_t member_byte_offset = 0; 3192 uint32_t i; 3193 for (i = 0; i < num_attributes; ++i) { 3194 const dw_attr_t attr = attributes.AttributeAtIndex(i); 3195 DWARFFormValue form_value; 3196 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 3197 switch (attr) { 3198 case DW_AT_decl_file: 3199 decl.SetFile(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex( 3200 form_value.Unsigned())); 3201 break; 3202 case DW_AT_decl_line: 3203 decl.SetLine(form_value.Unsigned()); 3204 break; 3205 case DW_AT_decl_column: 3206 decl.SetColumn(form_value.Unsigned()); 3207 break; 3208 case DW_AT_type: 3209 encoding_form = form_value; 3210 break; 3211 case DW_AT_data_member_location: 3212 if (form_value.BlockData()) { 3213 Value initialValue(0); 3214 Value memberOffset(0); 3215 const DWARFDataExtractor &debug_info_data = die.GetData(); 3216 uint32_t block_length = form_value.Unsigned(); 3217 uint32_t block_offset = 3218 form_value.BlockData() - debug_info_data.GetDataStart(); 3219 if (DWARFExpression::Evaluate(nullptr, nullptr, module_sp, 3220 debug_info_data, die.GetCU(), 3221 block_offset, block_length, 3222 eRegisterKindDWARF, &initialValue, 3223 nullptr, memberOffset, nullptr)) { 3224 member_byte_offset = memberOffset.ResolveValue(NULL).UInt(); 3225 } 3226 } else { 3227 // With DWARF 3 and later, if the value is an integer constant, 3228 // this form value is the offset in bytes from the beginning of 3229 // the containing entity. 3230 member_byte_offset = form_value.Unsigned(); 3231 } 3232 break; 3233 3234 case DW_AT_accessibility: 3235 accessibility = DW_ACCESS_to_AccessType(form_value.Unsigned()); 3236 break; 3237 3238 case DW_AT_virtuality: 3239 is_virtual = form_value.Boolean(); 3240 break; 3241 3242 case DW_AT_sibling: 3243 break; 3244 3245 default: 3246 break; 3247 } 3248 } 3249 } 3250 3251 Type *base_class_type = die.ResolveTypeUID(DIERef(encoding_form)); 3252 if (base_class_type == NULL) { 3253 module_sp->ReportError("0x%8.8x: DW_TAG_inheritance failed to " 3254 "resolve the base class at 0x%8.8x" 3255 " from enclosing type 0x%8.8x. \nPlease file " 3256 "a bug and attach the file at the start of " 3257 "this error message", 3258 die.GetOffset(), 3259 encoding_form.Reference().GetOffset(), 3260 parent_die.GetOffset()); 3261 break; 3262 } 3263 3264 CompilerType base_class_clang_type = 3265 base_class_type->GetFullCompilerType(); 3266 assert(base_class_clang_type); 3267 if (class_language == eLanguageTypeObjC) { 3268 ast->SetObjCSuperClass(class_clang_type, base_class_clang_type); 3269 } else { 3270 std::unique_ptr<clang::CXXBaseSpecifier> result = 3271 ast->CreateBaseClassSpecifier( 3272 base_class_clang_type.GetOpaqueQualType(), accessibility, 3273 is_virtual, is_base_of_class); 3274 if (!result) 3275 break; 3276 3277 base_classes.push_back(std::move(result)); 3278 3279 if (is_virtual) { 3280 // Do not specify any offset for virtual inheritance. The DWARF 3281 // produced by clang doesn't give us a constant offset, but gives 3282 // us a DWARF expressions that requires an actual object in memory. 3283 // the DW_AT_data_member_location for a virtual base class looks 3284 // like: 3285 // DW_AT_data_member_location( DW_OP_dup, DW_OP_deref, 3286 // DW_OP_constu(0x00000018), DW_OP_minus, DW_OP_deref, 3287 // DW_OP_plus ) 3288 // Given this, there is really no valid response we can give to 3289 // clang for virtual base class offsets, and this should eventually 3290 // be removed from LayoutRecordType() in the external 3291 // AST source in clang. 3292 } else { 3293 layout_info.base_offsets.insert(std::make_pair( 3294 ast->GetAsCXXRecordDecl( 3295 base_class_clang_type.GetOpaqueQualType()), 3296 clang::CharUnits::fromQuantity(member_byte_offset))); 3297 } 3298 } 3299 } 3300 } break; 3301 3302 default: 3303 break; 3304 } 3305 } 3306 3307 return true; 3308 } 3309 3310 size_t DWARFASTParserClang::ParseChildParameters( 3311 CompileUnit &comp_unit, clang::DeclContext *containing_decl_ctx, 3312 const DWARFDIE &parent_die, bool skip_artificial, bool &is_static, 3313 bool &is_variadic, bool &has_template_params, 3314 std::vector<CompilerType> &function_param_types, 3315 std::vector<clang::ParmVarDecl *> &function_param_decls, 3316 unsigned &type_quals) { 3317 if (!parent_die) 3318 return 0; 3319 3320 size_t arg_idx = 0; 3321 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 3322 die = die.GetSibling()) { 3323 const dw_tag_t tag = die.Tag(); 3324 switch (tag) { 3325 case DW_TAG_formal_parameter: { 3326 DWARFAttributes attributes; 3327 const size_t num_attributes = die.GetAttributes(attributes); 3328 if (num_attributes > 0) { 3329 const char *name = NULL; 3330 Declaration decl; 3331 DWARFFormValue param_type_die_form; 3332 bool is_artificial = false; 3333 // one of None, Auto, Register, Extern, Static, PrivateExtern 3334 3335 clang::StorageClass storage = clang::SC_None; 3336 uint32_t i; 3337 for (i = 0; i < num_attributes; ++i) { 3338 const dw_attr_t attr = attributes.AttributeAtIndex(i); 3339 DWARFFormValue form_value; 3340 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 3341 switch (attr) { 3342 case DW_AT_decl_file: 3343 decl.SetFile(comp_unit.GetSupportFiles().GetFileSpecAtIndex( 3344 form_value.Unsigned())); 3345 break; 3346 case DW_AT_decl_line: 3347 decl.SetLine(form_value.Unsigned()); 3348 break; 3349 case DW_AT_decl_column: 3350 decl.SetColumn(form_value.Unsigned()); 3351 break; 3352 case DW_AT_name: 3353 name = form_value.AsCString(); 3354 break; 3355 case DW_AT_type: 3356 param_type_die_form = form_value; 3357 break; 3358 case DW_AT_artificial: 3359 is_artificial = form_value.Boolean(); 3360 break; 3361 case DW_AT_location: 3362 case DW_AT_const_value: 3363 case DW_AT_default_value: 3364 case DW_AT_description: 3365 case DW_AT_endianity: 3366 case DW_AT_is_optional: 3367 case DW_AT_segment: 3368 case DW_AT_variable_parameter: 3369 default: 3370 case DW_AT_abstract_origin: 3371 case DW_AT_sibling: 3372 break; 3373 } 3374 } 3375 } 3376 3377 bool skip = false; 3378 if (skip_artificial && is_artificial) { 3379 // In order to determine if a C++ member function is "const" we 3380 // have to look at the const-ness of "this"... 3381 if (arg_idx == 0 && 3382 DeclKindIsCXXClass(containing_decl_ctx->getDeclKind()) && 3383 // Often times compilers omit the "this" name for the 3384 // specification DIEs, so we can't rely upon the name being in 3385 // the formal parameter DIE... 3386 (name == NULL || ::strcmp(name, "this") == 0)) { 3387 Type *this_type = die.ResolveTypeUID(DIERef(param_type_die_form)); 3388 if (this_type) { 3389 uint32_t encoding_mask = this_type->GetEncodingMask(); 3390 if (encoding_mask & Type::eEncodingIsPointerUID) { 3391 is_static = false; 3392 3393 if (encoding_mask & (1u << Type::eEncodingIsConstUID)) 3394 type_quals |= clang::Qualifiers::Const; 3395 if (encoding_mask & (1u << Type::eEncodingIsVolatileUID)) 3396 type_quals |= clang::Qualifiers::Volatile; 3397 } 3398 } 3399 } 3400 skip = true; 3401 } 3402 3403 if (!skip) { 3404 Type *type = die.ResolveTypeUID(DIERef(param_type_die_form)); 3405 if (type) { 3406 function_param_types.push_back(type->GetForwardCompilerType()); 3407 3408 clang::ParmVarDecl *param_var_decl = 3409 m_ast.CreateParameterDeclaration(containing_decl_ctx, name, 3410 type->GetForwardCompilerType(), 3411 storage); 3412 assert(param_var_decl); 3413 function_param_decls.push_back(param_var_decl); 3414 3415 m_ast.SetMetadataAsUserID(param_var_decl, die.GetID()); 3416 } 3417 } 3418 } 3419 arg_idx++; 3420 } break; 3421 3422 case DW_TAG_unspecified_parameters: 3423 is_variadic = true; 3424 break; 3425 3426 case DW_TAG_template_type_parameter: 3427 case DW_TAG_template_value_parameter: 3428 case DW_TAG_GNU_template_parameter_pack: 3429 // The one caller of this was never using the template_param_infos, and 3430 // the local variable was taking up a large amount of stack space in 3431 // SymbolFileDWARF::ParseType() so this was removed. If we ever need the 3432 // template params back, we can add them back. 3433 // ParseTemplateDIE (dwarf_cu, die, template_param_infos); 3434 has_template_params = true; 3435 break; 3436 3437 default: 3438 break; 3439 } 3440 } 3441 return arg_idx; 3442 } 3443 3444 llvm::Optional<SymbolFile::ArrayInfo> 3445 DWARFASTParser::ParseChildArrayInfo(const DWARFDIE &parent_die, 3446 const ExecutionContext *exe_ctx) { 3447 SymbolFile::ArrayInfo array_info; 3448 if (!parent_die) 3449 return llvm::None; 3450 3451 for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); 3452 die = die.GetSibling()) { 3453 const dw_tag_t tag = die.Tag(); 3454 switch (tag) { 3455 case DW_TAG_subrange_type: { 3456 DWARFAttributes attributes; 3457 const size_t num_child_attributes = die.GetAttributes(attributes); 3458 if (num_child_attributes > 0) { 3459 uint64_t num_elements = 0; 3460 uint64_t lower_bound = 0; 3461 uint64_t upper_bound = 0; 3462 bool upper_bound_valid = false; 3463 uint32_t i; 3464 for (i = 0; i < num_child_attributes; ++i) { 3465 const dw_attr_t attr = attributes.AttributeAtIndex(i); 3466 DWARFFormValue form_value; 3467 if (attributes.ExtractFormValueAtIndex(i, form_value)) { 3468 switch (attr) { 3469 case DW_AT_name: 3470 break; 3471 3472 case DW_AT_count: 3473 if (DWARFDIE var_die = die.GetReferencedDIE(DW_AT_count)) { 3474 if (var_die.Tag() == DW_TAG_variable) 3475 if (exe_ctx) { 3476 if (auto frame = exe_ctx->GetFrameSP()) { 3477 Status error; 3478 lldb::VariableSP var_sp; 3479 auto valobj_sp = frame->GetValueForVariableExpressionPath( 3480 var_die.GetName(), eNoDynamicValues, 0, var_sp, 3481 error); 3482 if (valobj_sp) { 3483 num_elements = valobj_sp->GetValueAsUnsigned(0); 3484 break; 3485 } 3486 } 3487 } 3488 } else 3489 num_elements = form_value.Unsigned(); 3490 break; 3491 3492 case DW_AT_bit_stride: 3493 array_info.bit_stride = form_value.Unsigned(); 3494 break; 3495 3496 case DW_AT_byte_stride: 3497 array_info.byte_stride = form_value.Unsigned(); 3498 break; 3499 3500 case DW_AT_lower_bound: 3501 lower_bound = form_value.Unsigned(); 3502 break; 3503 3504 case DW_AT_upper_bound: 3505 upper_bound_valid = true; 3506 upper_bound = form_value.Unsigned(); 3507 break; 3508 3509 default: 3510 case DW_AT_abstract_origin: 3511 case DW_AT_accessibility: 3512 case DW_AT_allocated: 3513 case DW_AT_associated: 3514 case DW_AT_data_location: 3515 case DW_AT_declaration: 3516 case DW_AT_description: 3517 case DW_AT_sibling: 3518 case DW_AT_threads_scaled: 3519 case DW_AT_type: 3520 case DW_AT_visibility: 3521 break; 3522 } 3523 } 3524 } 3525 3526 if (num_elements == 0) { 3527 if (upper_bound_valid && upper_bound >= lower_bound) 3528 num_elements = upper_bound - lower_bound + 1; 3529 } 3530 3531 array_info.element_orders.push_back(num_elements); 3532 } 3533 } break; 3534 } 3535 } 3536 return array_info; 3537 } 3538 3539 Type *DWARFASTParserClang::GetTypeForDIE(const DWARFDIE &die) { 3540 if (die) { 3541 SymbolFileDWARF *dwarf = die.GetDWARF(); 3542 DWARFAttributes attributes; 3543 const size_t num_attributes = die.GetAttributes(attributes); 3544 if (num_attributes > 0) { 3545 DWARFFormValue type_die_form; 3546 for (size_t i = 0; i < num_attributes; ++i) { 3547 dw_attr_t attr = attributes.AttributeAtIndex(i); 3548 DWARFFormValue form_value; 3549 3550 if (attr == DW_AT_type && 3551 attributes.ExtractFormValueAtIndex(i, form_value)) 3552 return dwarf->ResolveTypeUID(form_value.Reference(), true); 3553 } 3554 } 3555 } 3556 3557 return nullptr; 3558 } 3559 3560 clang::Decl *DWARFASTParserClang::GetClangDeclForDIE(const DWARFDIE &die) { 3561 if (!die) 3562 return nullptr; 3563 3564 switch (die.Tag()) { 3565 case DW_TAG_variable: 3566 case DW_TAG_constant: 3567 case DW_TAG_formal_parameter: 3568 case DW_TAG_imported_declaration: 3569 case DW_TAG_imported_module: 3570 break; 3571 default: 3572 return nullptr; 3573 } 3574 3575 DIEToDeclMap::iterator cache_pos = m_die_to_decl.find(die.GetDIE()); 3576 if (cache_pos != m_die_to_decl.end()) 3577 return cache_pos->second; 3578 3579 if (DWARFDIE spec_die = die.GetReferencedDIE(DW_AT_specification)) { 3580 clang::Decl *decl = GetClangDeclForDIE(spec_die); 3581 m_die_to_decl[die.GetDIE()] = decl; 3582 m_decl_to_die[decl].insert(die.GetDIE()); 3583 return decl; 3584 } 3585 3586 if (DWARFDIE abstract_origin_die = 3587 die.GetReferencedDIE(DW_AT_abstract_origin)) { 3588 clang::Decl *decl = GetClangDeclForDIE(abstract_origin_die); 3589 m_die_to_decl[die.GetDIE()] = decl; 3590 m_decl_to_die[decl].insert(die.GetDIE()); 3591 return decl; 3592 } 3593 3594 clang::Decl *decl = nullptr; 3595 switch (die.Tag()) { 3596 case DW_TAG_variable: 3597 case DW_TAG_constant: 3598 case DW_TAG_formal_parameter: { 3599 SymbolFileDWARF *dwarf = die.GetDWARF(); 3600 Type *type = GetTypeForDIE(die); 3601 if (dwarf && type) { 3602 const char *name = die.GetName(); 3603 clang::DeclContext *decl_context = 3604 ClangASTContext::DeclContextGetAsDeclContext( 3605 dwarf->GetDeclContextContainingUID(die.GetID())); 3606 decl = m_ast.CreateVariableDeclaration( 3607 decl_context, name, 3608 ClangUtil::GetQualType(type->GetForwardCompilerType())); 3609 } 3610 break; 3611 } 3612 case DW_TAG_imported_declaration: { 3613 SymbolFileDWARF *dwarf = die.GetDWARF(); 3614 DWARFDIE imported_uid = die.GetAttributeValueAsReferenceDIE(DW_AT_import); 3615 if (imported_uid) { 3616 CompilerDecl imported_decl = imported_uid.GetDecl(); 3617 if (imported_decl) { 3618 clang::DeclContext *decl_context = 3619 ClangASTContext::DeclContextGetAsDeclContext( 3620 dwarf->GetDeclContextContainingUID(die.GetID())); 3621 if (clang::NamedDecl *clang_imported_decl = 3622 llvm::dyn_cast<clang::NamedDecl>( 3623 (clang::Decl *)imported_decl.GetOpaqueDecl())) 3624 decl = 3625 m_ast.CreateUsingDeclaration(decl_context, clang_imported_decl); 3626 } 3627 } 3628 break; 3629 } 3630 case DW_TAG_imported_module: { 3631 SymbolFileDWARF *dwarf = die.GetDWARF(); 3632 DWARFDIE imported_uid = die.GetAttributeValueAsReferenceDIE(DW_AT_import); 3633 3634 if (imported_uid) { 3635 CompilerDeclContext imported_decl_ctx = imported_uid.GetDeclContext(); 3636 if (imported_decl_ctx) { 3637 clang::DeclContext *decl_context = 3638 ClangASTContext::DeclContextGetAsDeclContext( 3639 dwarf->GetDeclContextContainingUID(die.GetID())); 3640 if (clang::NamespaceDecl *ns_decl = 3641 ClangASTContext::DeclContextGetAsNamespaceDecl( 3642 imported_decl_ctx)) 3643 decl = m_ast.CreateUsingDirectiveDeclaration(decl_context, ns_decl); 3644 } 3645 } 3646 break; 3647 } 3648 default: 3649 break; 3650 } 3651 3652 m_die_to_decl[die.GetDIE()] = decl; 3653 m_decl_to_die[decl].insert(die.GetDIE()); 3654 3655 return decl; 3656 } 3657 3658 clang::DeclContext * 3659 DWARFASTParserClang::GetClangDeclContextForDIE(const DWARFDIE &die) { 3660 if (die) { 3661 clang::DeclContext *decl_ctx = GetCachedClangDeclContextForDIE(die); 3662 if (decl_ctx) 3663 return decl_ctx; 3664 3665 bool try_parsing_type = true; 3666 switch (die.Tag()) { 3667 case DW_TAG_compile_unit: 3668 case DW_TAG_partial_unit: 3669 decl_ctx = m_ast.GetTranslationUnitDecl(); 3670 try_parsing_type = false; 3671 break; 3672 3673 case DW_TAG_namespace: 3674 decl_ctx = ResolveNamespaceDIE(die); 3675 try_parsing_type = false; 3676 break; 3677 3678 case DW_TAG_lexical_block: 3679 decl_ctx = GetDeclContextForBlock(die); 3680 try_parsing_type = false; 3681 break; 3682 3683 default: 3684 break; 3685 } 3686 3687 if (decl_ctx == nullptr && try_parsing_type) { 3688 Type *type = die.GetDWARF()->ResolveType(die); 3689 if (type) 3690 decl_ctx = GetCachedClangDeclContextForDIE(die); 3691 } 3692 3693 if (decl_ctx) { 3694 LinkDeclContextToDIE(decl_ctx, die); 3695 return decl_ctx; 3696 } 3697 } 3698 return nullptr; 3699 } 3700 3701 static bool IsSubroutine(const DWARFDIE &die) { 3702 switch (die.Tag()) { 3703 case DW_TAG_subprogram: 3704 case DW_TAG_inlined_subroutine: 3705 return true; 3706 default: 3707 return false; 3708 } 3709 } 3710 3711 static DWARFDIE GetContainingFunctionWithAbstractOrigin(const DWARFDIE &die) { 3712 for (DWARFDIE candidate = die; candidate; candidate = candidate.GetParent()) { 3713 if (IsSubroutine(candidate)) { 3714 if (candidate.GetReferencedDIE(DW_AT_abstract_origin)) { 3715 return candidate; 3716 } else { 3717 return DWARFDIE(); 3718 } 3719 } 3720 } 3721 assert(0 && "Shouldn't call GetContainingFunctionWithAbstractOrigin on " 3722 "something not in a function"); 3723 return DWARFDIE(); 3724 } 3725 3726 static DWARFDIE FindAnyChildWithAbstractOrigin(const DWARFDIE &context) { 3727 for (DWARFDIE candidate = context.GetFirstChild(); candidate.IsValid(); 3728 candidate = candidate.GetSibling()) { 3729 if (candidate.GetReferencedDIE(DW_AT_abstract_origin)) { 3730 return candidate; 3731 } 3732 } 3733 return DWARFDIE(); 3734 } 3735 3736 static DWARFDIE FindFirstChildWithAbstractOrigin(const DWARFDIE &block, 3737 const DWARFDIE &function) { 3738 assert(IsSubroutine(function)); 3739 for (DWARFDIE context = block; context != function.GetParent(); 3740 context = context.GetParent()) { 3741 assert(!IsSubroutine(context) || context == function); 3742 if (DWARFDIE child = FindAnyChildWithAbstractOrigin(context)) { 3743 return child; 3744 } 3745 } 3746 return DWARFDIE(); 3747 } 3748 3749 clang::DeclContext * 3750 DWARFASTParserClang::GetDeclContextForBlock(const DWARFDIE &die) { 3751 assert(die.Tag() == DW_TAG_lexical_block); 3752 DWARFDIE containing_function_with_abstract_origin = 3753 GetContainingFunctionWithAbstractOrigin(die); 3754 if (!containing_function_with_abstract_origin) { 3755 return (clang::DeclContext *)ResolveBlockDIE(die); 3756 } 3757 DWARFDIE child = FindFirstChildWithAbstractOrigin( 3758 die, containing_function_with_abstract_origin); 3759 CompilerDeclContext decl_context = 3760 GetDeclContextContainingUIDFromDWARF(child); 3761 return (clang::DeclContext *)decl_context.GetOpaqueDeclContext(); 3762 } 3763 3764 clang::BlockDecl *DWARFASTParserClang::ResolveBlockDIE(const DWARFDIE &die) { 3765 if (die && die.Tag() == DW_TAG_lexical_block) { 3766 clang::BlockDecl *decl = 3767 llvm::cast_or_null<clang::BlockDecl>(m_die_to_decl_ctx[die.GetDIE()]); 3768 3769 if (!decl) { 3770 DWARFDIE decl_context_die; 3771 clang::DeclContext *decl_context = 3772 GetClangDeclContextContainingDIE(die, &decl_context_die); 3773 decl = m_ast.CreateBlockDeclaration(decl_context); 3774 3775 if (decl) 3776 LinkDeclContextToDIE((clang::DeclContext *)decl, die); 3777 } 3778 3779 return decl; 3780 } 3781 return nullptr; 3782 } 3783 3784 clang::NamespaceDecl * 3785 DWARFASTParserClang::ResolveNamespaceDIE(const DWARFDIE &die) { 3786 if (die && die.Tag() == DW_TAG_namespace) { 3787 // See if we already parsed this namespace DIE and associated it with a 3788 // uniqued namespace declaration 3789 clang::NamespaceDecl *namespace_decl = 3790 static_cast<clang::NamespaceDecl *>(m_die_to_decl_ctx[die.GetDIE()]); 3791 if (namespace_decl) 3792 return namespace_decl; 3793 else { 3794 const char *namespace_name = die.GetName(); 3795 clang::DeclContext *containing_decl_ctx = 3796 GetClangDeclContextContainingDIE(die, nullptr); 3797 bool is_inline = 3798 die.GetAttributeValueAsUnsigned(DW_AT_export_symbols, 0) != 0; 3799 3800 namespace_decl = m_ast.GetUniqueNamespaceDeclaration( 3801 namespace_name, containing_decl_ctx, is_inline); 3802 Log *log = 3803 nullptr; // (LogChannelDWARF::GetLogIfAll(DWARF_LOG_DEBUG_INFO)); 3804 if (log) { 3805 SymbolFileDWARF *dwarf = die.GetDWARF(); 3806 if (namespace_name) { 3807 dwarf->GetObjectFile()->GetModule()->LogMessage( 3808 log, "ASTContext => %p: 0x%8.8" PRIx64 3809 ": DW_TAG_namespace with DW_AT_name(\"%s\") => " 3810 "clang::NamespaceDecl *%p (original = %p)", 3811 static_cast<void *>(m_ast.getASTContext()), die.GetID(), 3812 namespace_name, static_cast<void *>(namespace_decl), 3813 static_cast<void *>(namespace_decl->getOriginalNamespace())); 3814 } else { 3815 dwarf->GetObjectFile()->GetModule()->LogMessage( 3816 log, "ASTContext => %p: 0x%8.8" PRIx64 3817 ": DW_TAG_namespace (anonymous) => clang::NamespaceDecl *%p " 3818 "(original = %p)", 3819 static_cast<void *>(m_ast.getASTContext()), die.GetID(), 3820 static_cast<void *>(namespace_decl), 3821 static_cast<void *>(namespace_decl->getOriginalNamespace())); 3822 } 3823 } 3824 3825 if (namespace_decl) 3826 LinkDeclContextToDIE((clang::DeclContext *)namespace_decl, die); 3827 return namespace_decl; 3828 } 3829 } 3830 return nullptr; 3831 } 3832 3833 clang::DeclContext *DWARFASTParserClang::GetClangDeclContextContainingDIE( 3834 const DWARFDIE &die, DWARFDIE *decl_ctx_die_copy) { 3835 SymbolFileDWARF *dwarf = die.GetDWARF(); 3836 3837 DWARFDIE decl_ctx_die = dwarf->GetDeclContextDIEContainingDIE(die); 3838 3839 if (decl_ctx_die_copy) 3840 *decl_ctx_die_copy = decl_ctx_die; 3841 3842 if (decl_ctx_die) { 3843 clang::DeclContext *clang_decl_ctx = 3844 GetClangDeclContextForDIE(decl_ctx_die); 3845 if (clang_decl_ctx) 3846 return clang_decl_ctx; 3847 } 3848 return m_ast.GetTranslationUnitDecl(); 3849 } 3850 3851 clang::DeclContext * 3852 DWARFASTParserClang::GetCachedClangDeclContextForDIE(const DWARFDIE &die) { 3853 if (die) { 3854 DIEToDeclContextMap::iterator pos = m_die_to_decl_ctx.find(die.GetDIE()); 3855 if (pos != m_die_to_decl_ctx.end()) 3856 return pos->second; 3857 } 3858 return nullptr; 3859 } 3860 3861 void DWARFASTParserClang::LinkDeclContextToDIE(clang::DeclContext *decl_ctx, 3862 const DWARFDIE &die) { 3863 m_die_to_decl_ctx[die.GetDIE()] = decl_ctx; 3864 // There can be many DIEs for a single decl context 3865 // m_decl_ctx_to_die[decl_ctx].insert(die.GetDIE()); 3866 m_decl_ctx_to_die.insert(std::make_pair(decl_ctx, die)); 3867 } 3868 3869 bool DWARFASTParserClang::CopyUniqueClassMethodTypes( 3870 const DWARFDIE &src_class_die, const DWARFDIE &dst_class_die, 3871 lldb_private::Type *class_type, std::vector<DWARFDIE> &failures) { 3872 if (!class_type || !src_class_die || !dst_class_die) 3873 return false; 3874 if (src_class_die.Tag() != dst_class_die.Tag()) 3875 return false; 3876 3877 // We need to complete the class type so we can get all of the method types 3878 // parsed so we can then unique those types to their equivalent counterparts 3879 // in "dst_cu" and "dst_class_die" 3880 class_type->GetFullCompilerType(); 3881 3882 DWARFDIE src_die; 3883 DWARFDIE dst_die; 3884 UniqueCStringMap<DWARFDIE> src_name_to_die; 3885 UniqueCStringMap<DWARFDIE> dst_name_to_die; 3886 UniqueCStringMap<DWARFDIE> src_name_to_die_artificial; 3887 UniqueCStringMap<DWARFDIE> dst_name_to_die_artificial; 3888 for (src_die = src_class_die.GetFirstChild(); src_die.IsValid(); 3889 src_die = src_die.GetSibling()) { 3890 if (src_die.Tag() == DW_TAG_subprogram) { 3891 // Make sure this is a declaration and not a concrete instance by looking 3892 // for DW_AT_declaration set to 1. Sometimes concrete function instances 3893 // are placed inside the class definitions and shouldn't be included in 3894 // the list of things are are tracking here. 3895 if (src_die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0) == 1) { 3896 const char *src_name = src_die.GetMangledName(); 3897 if (src_name) { 3898 ConstString src_const_name(src_name); 3899 if (src_die.GetAttributeValueAsUnsigned(DW_AT_artificial, 0)) 3900 src_name_to_die_artificial.Append(src_const_name, src_die); 3901 else 3902 src_name_to_die.Append(src_const_name, src_die); 3903 } 3904 } 3905 } 3906 } 3907 for (dst_die = dst_class_die.GetFirstChild(); dst_die.IsValid(); 3908 dst_die = dst_die.GetSibling()) { 3909 if (dst_die.Tag() == DW_TAG_subprogram) { 3910 // Make sure this is a declaration and not a concrete instance by looking 3911 // for DW_AT_declaration set to 1. Sometimes concrete function instances 3912 // are placed inside the class definitions and shouldn't be included in 3913 // the list of things are are tracking here. 3914 if (dst_die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0) == 1) { 3915 const char *dst_name = dst_die.GetMangledName(); 3916 if (dst_name) { 3917 ConstString dst_const_name(dst_name); 3918 if (dst_die.GetAttributeValueAsUnsigned(DW_AT_artificial, 0)) 3919 dst_name_to_die_artificial.Append(dst_const_name, dst_die); 3920 else 3921 dst_name_to_die.Append(dst_const_name, dst_die); 3922 } 3923 } 3924 } 3925 } 3926 const uint32_t src_size = src_name_to_die.GetSize(); 3927 const uint32_t dst_size = dst_name_to_die.GetSize(); 3928 Log *log = nullptr; // (LogChannelDWARF::GetLogIfAny(DWARF_LOG_DEBUG_INFO | 3929 // DWARF_LOG_TYPE_COMPLETION)); 3930 3931 // Is everything kosher so we can go through the members at top speed? 3932 bool fast_path = true; 3933 3934 if (src_size != dst_size) { 3935 if (src_size != 0 && dst_size != 0) { 3936 if (log) 3937 log->Printf("warning: trying to unique class DIE 0x%8.8x to 0x%8.8x, " 3938 "but they didn't have the same size (src=%d, dst=%d)", 3939 src_class_die.GetOffset(), dst_class_die.GetOffset(), 3940 src_size, dst_size); 3941 } 3942 3943 fast_path = false; 3944 } 3945 3946 uint32_t idx; 3947 3948 if (fast_path) { 3949 for (idx = 0; idx < src_size; ++idx) { 3950 src_die = src_name_to_die.GetValueAtIndexUnchecked(idx); 3951 dst_die = dst_name_to_die.GetValueAtIndexUnchecked(idx); 3952 3953 if (src_die.Tag() != dst_die.Tag()) { 3954 if (log) 3955 log->Printf("warning: tried to unique class DIE 0x%8.8x to 0x%8.8x, " 3956 "but 0x%8.8x (%s) tags didn't match 0x%8.8x (%s)", 3957 src_class_die.GetOffset(), dst_class_die.GetOffset(), 3958 src_die.GetOffset(), src_die.GetTagAsCString(), 3959 dst_die.GetOffset(), dst_die.GetTagAsCString()); 3960 fast_path = false; 3961 } 3962 3963 const char *src_name = src_die.GetMangledName(); 3964 const char *dst_name = dst_die.GetMangledName(); 3965 3966 // Make sure the names match 3967 if (src_name == dst_name || (strcmp(src_name, dst_name) == 0)) 3968 continue; 3969 3970 if (log) 3971 log->Printf("warning: tried to unique class DIE 0x%8.8x to 0x%8.8x, " 3972 "but 0x%8.8x (%s) names didn't match 0x%8.8x (%s)", 3973 src_class_die.GetOffset(), dst_class_die.GetOffset(), 3974 src_die.GetOffset(), src_name, dst_die.GetOffset(), 3975 dst_name); 3976 3977 fast_path = false; 3978 } 3979 } 3980 3981 DWARFASTParserClang *src_dwarf_ast_parser = 3982 (DWARFASTParserClang *)src_die.GetDWARFParser(); 3983 DWARFASTParserClang *dst_dwarf_ast_parser = 3984 (DWARFASTParserClang *)dst_die.GetDWARFParser(); 3985 3986 // Now do the work of linking the DeclContexts and Types. 3987 if (fast_path) { 3988 // We can do this quickly. Just run across the tables index-for-index 3989 // since we know each node has matching names and tags. 3990 for (idx = 0; idx < src_size; ++idx) { 3991 src_die = src_name_to_die.GetValueAtIndexUnchecked(idx); 3992 dst_die = dst_name_to_die.GetValueAtIndexUnchecked(idx); 3993 3994 clang::DeclContext *src_decl_ctx = 3995 src_dwarf_ast_parser->m_die_to_decl_ctx[src_die.GetDIE()]; 3996 if (src_decl_ctx) { 3997 if (log) 3998 log->Printf("uniquing decl context %p from 0x%8.8x for 0x%8.8x", 3999 static_cast<void *>(src_decl_ctx), src_die.GetOffset(), 4000 dst_die.GetOffset()); 4001 dst_dwarf_ast_parser->LinkDeclContextToDIE(src_decl_ctx, dst_die); 4002 } else { 4003 if (log) 4004 log->Printf("warning: tried to unique decl context from 0x%8.8x for " 4005 "0x%8.8x, but none was found", 4006 src_die.GetOffset(), dst_die.GetOffset()); 4007 } 4008 4009 Type *src_child_type = 4010 dst_die.GetDWARF()->GetDIEToType()[src_die.GetDIE()]; 4011 if (src_child_type) { 4012 if (log) 4013 log->Printf( 4014 "uniquing type %p (uid=0x%" PRIx64 ") from 0x%8.8x for 0x%8.8x", 4015 static_cast<void *>(src_child_type), src_child_type->GetID(), 4016 src_die.GetOffset(), dst_die.GetOffset()); 4017 dst_die.GetDWARF()->GetDIEToType()[dst_die.GetDIE()] = src_child_type; 4018 } else { 4019 if (log) 4020 log->Printf("warning: tried to unique lldb_private::Type from " 4021 "0x%8.8x for 0x%8.8x, but none was found", 4022 src_die.GetOffset(), dst_die.GetOffset()); 4023 } 4024 } 4025 } else { 4026 // We must do this slowly. For each member of the destination, look up a 4027 // member in the source with the same name, check its tag, and unique them 4028 // if everything matches up. Report failures. 4029 4030 if (!src_name_to_die.IsEmpty() && !dst_name_to_die.IsEmpty()) { 4031 src_name_to_die.Sort(); 4032 4033 for (idx = 0; idx < dst_size; ++idx) { 4034 ConstString dst_name = dst_name_to_die.GetCStringAtIndex(idx); 4035 dst_die = dst_name_to_die.GetValueAtIndexUnchecked(idx); 4036 src_die = src_name_to_die.Find(dst_name, DWARFDIE()); 4037 4038 if (src_die && (src_die.Tag() == dst_die.Tag())) { 4039 clang::DeclContext *src_decl_ctx = 4040 src_dwarf_ast_parser->m_die_to_decl_ctx[src_die.GetDIE()]; 4041 if (src_decl_ctx) { 4042 if (log) 4043 log->Printf("uniquing decl context %p from 0x%8.8x for 0x%8.8x", 4044 static_cast<void *>(src_decl_ctx), 4045 src_die.GetOffset(), dst_die.GetOffset()); 4046 dst_dwarf_ast_parser->LinkDeclContextToDIE(src_decl_ctx, dst_die); 4047 } else { 4048 if (log) 4049 log->Printf("warning: tried to unique decl context from 0x%8.8x " 4050 "for 0x%8.8x, but none was found", 4051 src_die.GetOffset(), dst_die.GetOffset()); 4052 } 4053 4054 Type *src_child_type = 4055 dst_die.GetDWARF()->GetDIEToType()[src_die.GetDIE()]; 4056 if (src_child_type) { 4057 if (log) 4058 log->Printf("uniquing type %p (uid=0x%" PRIx64 4059 ") from 0x%8.8x for 0x%8.8x", 4060 static_cast<void *>(src_child_type), 4061 src_child_type->GetID(), src_die.GetOffset(), 4062 dst_die.GetOffset()); 4063 dst_die.GetDWARF()->GetDIEToType()[dst_die.GetDIE()] = 4064 src_child_type; 4065 } else { 4066 if (log) 4067 log->Printf("warning: tried to unique lldb_private::Type from " 4068 "0x%8.8x for 0x%8.8x, but none was found", 4069 src_die.GetOffset(), dst_die.GetOffset()); 4070 } 4071 } else { 4072 if (log) 4073 log->Printf("warning: couldn't find a match for 0x%8.8x", 4074 dst_die.GetOffset()); 4075 4076 failures.push_back(dst_die); 4077 } 4078 } 4079 } 4080 } 4081 4082 const uint32_t src_size_artificial = src_name_to_die_artificial.GetSize(); 4083 const uint32_t dst_size_artificial = dst_name_to_die_artificial.GetSize(); 4084 4085 if (src_size_artificial && dst_size_artificial) { 4086 dst_name_to_die_artificial.Sort(); 4087 4088 for (idx = 0; idx < src_size_artificial; ++idx) { 4089 ConstString src_name_artificial = 4090 src_name_to_die_artificial.GetCStringAtIndex(idx); 4091 src_die = src_name_to_die_artificial.GetValueAtIndexUnchecked(idx); 4092 dst_die = 4093 dst_name_to_die_artificial.Find(src_name_artificial, DWARFDIE()); 4094 4095 if (dst_die) { 4096 // Both classes have the artificial types, link them 4097 clang::DeclContext *src_decl_ctx = 4098 src_dwarf_ast_parser->m_die_to_decl_ctx[src_die.GetDIE()]; 4099 if (src_decl_ctx) { 4100 if (log) 4101 log->Printf("uniquing decl context %p from 0x%8.8x for 0x%8.8x", 4102 static_cast<void *>(src_decl_ctx), src_die.GetOffset(), 4103 dst_die.GetOffset()); 4104 dst_dwarf_ast_parser->LinkDeclContextToDIE(src_decl_ctx, dst_die); 4105 } else { 4106 if (log) 4107 log->Printf("warning: tried to unique decl context from 0x%8.8x " 4108 "for 0x%8.8x, but none was found", 4109 src_die.GetOffset(), dst_die.GetOffset()); 4110 } 4111 4112 Type *src_child_type = 4113 dst_die.GetDWARF()->GetDIEToType()[src_die.GetDIE()]; 4114 if (src_child_type) { 4115 if (log) 4116 log->Printf( 4117 "uniquing type %p (uid=0x%" PRIx64 ") from 0x%8.8x for 0x%8.8x", 4118 static_cast<void *>(src_child_type), src_child_type->GetID(), 4119 src_die.GetOffset(), dst_die.GetOffset()); 4120 dst_die.GetDWARF()->GetDIEToType()[dst_die.GetDIE()] = src_child_type; 4121 } else { 4122 if (log) 4123 log->Printf("warning: tried to unique lldb_private::Type from " 4124 "0x%8.8x for 0x%8.8x, but none was found", 4125 src_die.GetOffset(), dst_die.GetOffset()); 4126 } 4127 } 4128 } 4129 } 4130 4131 if (dst_size_artificial) { 4132 for (idx = 0; idx < dst_size_artificial; ++idx) { 4133 ConstString dst_name_artificial = 4134 dst_name_to_die_artificial.GetCStringAtIndex(idx); 4135 dst_die = dst_name_to_die_artificial.GetValueAtIndexUnchecked(idx); 4136 if (log) 4137 log->Printf("warning: need to create artificial method for 0x%8.8x for " 4138 "method '%s'", 4139 dst_die.GetOffset(), dst_name_artificial.GetCString()); 4140 4141 failures.push_back(dst_die); 4142 } 4143 } 4144 4145 return !failures.empty(); 4146 } 4147