ExternalASTSource.cpp

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//===- ExternalASTSource.cpp - Abstract External AST Interface ------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
//  This file provides the default implementation of the ExternalASTSource
//  interface, which enables construction of AST nodes from some external
//  source.
//
//===----------------------------------------------------------------------===//
 
#include "clang/AST/ExternalASTSource.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclarationName.h"
#include "clang/Basic/ASTSourceDescriptor.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LLVM.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstdint>
#include <optional>
 
using namespace clang;
 
char ExternalASTSource::ID;
 
ExternalASTSource::~ExternalASTSource() = default;
 
std::optional<ASTSourceDescriptor>
ExternalASTSource::getSourceDescriptor(unsigned ID) {
  return std::nullopt;
}
 
ExternalASTSource::ExtKind
ExternalASTSource::hasExternalDefinitions(const Decl *D) {
  return EK_ReplyHazy;
}
 
void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
                                            unsigned Length,
                                            SmallVectorImpl<Decl *> &Decls) {}
 
void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
 
void ExternalASTSource::CompleteType(TagDecl *Tag) {}
 
void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
 
void ExternalASTSource::ReadComments() {}
 
void ExternalASTSource::StartedDeserializing() {}
 
void ExternalASTSource::FinishedDeserializing() {}
 
void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
 
void ExternalASTSource::PrintStats() {}
 
bool ExternalASTSource::layoutRecordType(
    const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
    llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
    llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
    llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) {
  return false;
}
 
Decl *ExternalASTSource::GetExternalDecl(GlobalDeclID ID) { return nullptr; }
 
Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
  return Selector();
}
 
uint32_t ExternalASTSource::GetNumExternalSelectors() {
   return 0;
}
 
Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
  return nullptr;
}
 
CXXCtorInitializer **
ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
  return nullptr;
}
 
CXXBaseSpecifier *
ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
  return nullptr;
}
 
bool ExternalASTSource::FindExternalVisibleDeclsByName(
    const DeclContext *DC, DeclarationName Name,
    const DeclContext *OriginalDC) {
  return false;
}
 
bool ExternalASTSource::LoadExternalSpecializations(const Decl *D, bool) {
  return false;
}
 
bool ExternalASTSource::LoadExternalSpecializations(
    const Decl *D, ArrayRef<TemplateArgument>) {
  return false;
}
 
void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
 
void ExternalASTSource::FindExternalLexicalDecls(
    const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
    SmallVectorImpl<Decl *> &Result) {}
 
void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const {}
 
uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
  uint32_t OldGeneration = CurrentGeneration;
 
  // Make sure the generation of the topmost external source for the context is
  // incremented. That might not be us.
  auto *P = C.getExternalSource();
  if (P && P != this)
    CurrentGeneration = P->incrementGeneration(C);
  else {
    // FIXME: Only bump the generation counter if the current generation number
    // has been observed?
    if (!++CurrentGeneration)
      llvm::report_fatal_error("generation counter overflowed", false);
  }
 
  return OldGeneration;
}