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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/FileManager.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/Module.h"
#include "clang/Basic/SourceManager.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(uint32_t 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) {
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;
}
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