1 //===- ExternalASTSource.cpp - Abstract External AST Interface --*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file provides the default implementation of the ExternalASTSource 11 // interface, which enables construction of AST nodes from some external 12 // source. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #include "clang/AST/ExternalASTSource.h" 17 #include "clang/AST/ASTContext.h" 18 #include "clang/AST/DeclarationName.h" 19 #include "llvm/Support/ErrorHandling.h" 20 21 using namespace clang; 22 23 ExternalASTSource::~ExternalASTSource() { } 24 25 void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset, 26 unsigned Length, 27 SmallVectorImpl<Decl *> &Decls) {} 28 29 void ExternalASTSource::CompleteRedeclChain(const Decl *D) {} 30 31 void ExternalASTSource::CompleteType(TagDecl *Tag) {} 32 33 void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {} 34 35 void ExternalASTSource::ReadComments() {} 36 37 void ExternalASTSource::StartedDeserializing() {} 38 39 void ExternalASTSource::FinishedDeserializing() {} 40 41 void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {} 42 43 void ExternalASTSource::PrintStats() { } 44 45 bool ExternalASTSource::layoutRecordType( 46 const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment, 47 llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets, 48 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets, 49 llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) { 50 return false; 51 } 52 53 Decl *ExternalASTSource::GetExternalDecl(uint32_t ID) { 54 return nullptr; 55 } 56 57 Selector ExternalASTSource::GetExternalSelector(uint32_t ID) { 58 return Selector(); 59 } 60 61 uint32_t ExternalASTSource::GetNumExternalSelectors() { 62 return 0; 63 } 64 65 Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) { 66 return nullptr; 67 } 68 69 CXXBaseSpecifier * 70 ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) { 71 return nullptr; 72 } 73 74 bool 75 ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC, 76 DeclarationName Name) { 77 return false; 78 } 79 80 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) { 81 } 82 83 ExternalLoadResult 84 ExternalASTSource::FindExternalLexicalDecls(const DeclContext *DC, 85 bool (*isKindWeWant)(Decl::Kind), 86 SmallVectorImpl<Decl*> &Result) { 87 return ELR_AlreadyLoaded; 88 } 89 90 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const { } 91 92 uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) { 93 uint32_t OldGeneration = CurrentGeneration; 94 95 // Make sure the generation of the topmost external source for the context is 96 // incremented. That might not be us. 97 auto *P = C.getExternalSource(); 98 if (P && P != this) 99 CurrentGeneration = P->incrementGeneration(C); 100 else { 101 // FIXME: Only bump the generation counter if the current generation number 102 // has been observed? 103 if (!++CurrentGeneration) 104 llvm::report_fatal_error("generation counter overflowed", false); 105 } 106 107 return OldGeneration; 108 } 109