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 "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 CXXCtorInitializer **
  70 ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
  71   return nullptr;
  72 }
  73
  74 CXXBaseSpecifier *
  75 ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
  76   return nullptr;
  77 }
  78
  79 bool
  80 ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
  81                                                   DeclarationName Name) {
  82   return false;
  83 }
  84
  85 void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {
  86 }
  87
  88 ExternalLoadResult
  89 ExternalASTSource::FindExternalLexicalDecls(const DeclContext *DC,
  90                                             bool (*isKindWeWant)(Decl::Kind),
  91                                          SmallVectorImpl<Decl*> &Result) {
  92   return ELR_AlreadyLoaded;
  93 }
  94
  95 void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const { }
  96
  97 uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
  98   uint32_t OldGeneration = CurrentGeneration;
  99
 100   // Make sure the generation of the topmost external source for the context is
 101   // incremented. That might not be us.
 102   auto *P = C.getExternalSource();
 103   if (P && P != this)
 104     CurrentGeneration = P->incrementGeneration(C);
 105   else {
 106     // FIXME: Only bump the generation counter if the current generation number
 107     // has been observed?
 108     if (!++CurrentGeneration)
 109       llvm::report_fatal_error("generation counter overflowed", false);
 110   }
 111
 112   return OldGeneration;
 113 }