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::ASTSourceDescriptor::ASTSourceDescriptor(const Module &M)
  32   : Signature(M.Signature), ClangModule(&M) {
  33   if (M.Directory)
  34     Path = M.Directory->getName();
  35   if (auto *File = M.getASTFile())
  36     ASTFile = File->getName();
  37 }
  38
  39 std::string ExternalASTSource::ASTSourceDescriptor::getModuleName() const {
  40   if (ClangModule)
  41     return ClangModule->Name;
  42   else
  43     return PCHModuleName;
  44 }
  45
  46 void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
  47                                             unsigned Length,
  48                                             SmallVectorImpl<Decl *> &Decls) {}
  49
  50 void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
  51
  52 void ExternalASTSource::CompleteType(TagDecl *Tag) {}
  53
  54 void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
  55
  56 void ExternalASTSource::ReadComments() {}
  57
  58 void ExternalASTSource::StartedDeserializing() {}
  59
  60 void ExternalASTSource::FinishedDeserializing() {}
  61
  62 void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
  63
  64 void ExternalASTSource::PrintStats() { }
  65
  66 bool ExternalASTSource::layoutRecordType(
  67     const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
  68     llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
  69     llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
  70     llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) {
  71   return false;
  72 }
  73
  74 Decl *ExternalASTSource::GetExternalDecl(uint32_t ID) {
  75   return nullptr;
  76 }
  77
  78 Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
  79   return Selector();
  80 }
  81
  82 uint32_t ExternalASTSource::GetNumExternalSelectors() {
  83    return 0;
  84 }
  85
  86 Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
  87   return nullptr;
  88 }
  89
  90 CXXCtorInitializer **
  91 ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
  92   return nullptr;
  93 }
  94
  95 CXXBaseSpecifier *
  96 ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
  97   return nullptr;
  98 }
  99
 100 bool
 101 ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
 102                                                   DeclarationName Name) {
 103   return false;
 104 }
 105
 106 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
 107
 108 void ExternalASTSource::FindExternalLexicalDecls(
 109     const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
 110     SmallVectorImpl<Decl *> &Result) {}
 111
 112 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const {}
 113
 114 uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
 115   uint32_t OldGeneration = CurrentGeneration;
 116
 117   // Make sure the generation of the topmost external source for the context is
 118   // incremented. That might not be us.
 119   auto *P = C.getExternalSource();
 120   if (P && P != this)
 121     CurrentGeneration = P->incrementGeneration(C);
 122   else {
 123     // FIXME: Only bump the generation counter if the current generation number
 124     // has been observed?
 125     if (!++CurrentGeneration)
 126       llvm::report_fatal_error("generation counter overflowed", false);
 127   }
 128
 129   return OldGeneration;
 130 }