contrib/llvm/tools/clang/lib/AST/ExternalASTSource.cpp

   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 "clang/Basic/Module.h"
  20 #include "llvm/Support/ErrorHandling.h"
  21
  22 using namespace clang;
  23
  24 ExternalASTSource::~ExternalASTSource() { }
  25
  26 llvm::Optional<ExternalASTSource::ASTSourceDescriptor>
  27 ExternalASTSource::getSourceDescriptor(unsigned ID) {
  28   return None;
  29 }
  30
  31 ExternalASTSource::ExtKind
  32 ExternalASTSource::hasExternalDefinitions(const Decl *D) {
  33   return EK_ReplyHazy;
  34 }
  35
  36 ExternalASTSource::ASTSourceDescriptor::ASTSourceDescriptor(const Module &M)
  37   : Signature(M.Signature), ClangModule(&M) {
  38   if (M.Directory)
  39     Path = M.Directory->getName();
  40   if (auto *File = M.getASTFile())
  41     ASTFile = File->getName();
  42 }
  43
  44 std::string ExternalASTSource::ASTSourceDescriptor::getModuleName() const {
  45   if (ClangModule)
  46     return ClangModule->Name;
  47   else
  48     return PCHModuleName;
  49 }
  50
  51 void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
  52                                             unsigned Length,
  53                                             SmallVectorImpl<Decl *> &Decls) {}
  54
  55 void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
  56
  57 void ExternalASTSource::CompleteType(TagDecl *Tag) {}
  58
  59 void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
  60
  61 void ExternalASTSource::ReadComments() {}
  62
  63 void ExternalASTSource::StartedDeserializing() {}
  64
  65 void ExternalASTSource::FinishedDeserializing() {}
  66
  67 void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
  68
  69 void ExternalASTSource::PrintStats() { }
  70
  71 bool ExternalASTSource::layoutRecordType(
  72     const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
  73     llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
  74     llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
  75     llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) {
  76   return false;
  77 }
  78
  79 Decl *ExternalASTSource::GetExternalDecl(uint32_t ID) {
  80   return nullptr;
  81 }
  82
  83 Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
  84   return Selector();
  85 }
  86
  87 uint32_t ExternalASTSource::GetNumExternalSelectors() {
  88    return 0;
  89 }
  90
  91 Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
  92   return nullptr;
  93 }
  94
  95 CXXCtorInitializer **
  96 ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
  97   return nullptr;
  98 }
  99
 100 CXXBaseSpecifier *
 101 ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
 102   return nullptr;
 103 }
 104
 105 bool
 106 ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
 107                                                   DeclarationName Name) {
 108   return false;
 109 }
 110
 111 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
 112
 113 void ExternalASTSource::FindExternalLexicalDecls(
 114     const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
 115     SmallVectorImpl<Decl *> &Result) {}
 116
 117 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const {}
 118
 119 uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
 120   uint32_t OldGeneration = CurrentGeneration;
 121
 122   // Make sure the generation of the topmost external source for the context is
 123   // incremented. That might not be us.
 124   auto *P = C.getExternalSource();
 125   if (P && P != this)
 126     CurrentGeneration = P->incrementGeneration(C);
 127   else {
 128     // FIXME: Only bump the generation counter if the current generation number
 129     // has been observed?
 130     if (!++CurrentGeneration)
 131       llvm::report_fatal_error("generation counter overflowed", false);
 132   }
 133
 134   return OldGeneration;
 135 }