//===--- MultiplexExternalSemaSource.cpp  ---------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the event dispatching to the subscribed clients.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/MultiplexExternalSemaSource.h"

#include "clang/AST/DeclContextInternals.h"
#include "clang/Sema/Lookup.h"

using namespace clang;

///\brief Constructs a new multiplexing external sema source and appends the
/// given element to it.
///
///\param[in] source - An ExternalSemaSource.
///
MultiplexExternalSemaSource::MultiplexExternalSemaSource(ExternalSemaSource &s1,
                                                        ExternalSemaSource &s2){
  Sources.push_back(&s1);
  Sources.push_back(&s2);
}

// pin the vtable here.
MultiplexExternalSemaSource::~MultiplexExternalSemaSource() {}

///\brief Appends new source to the source list.
///
///\param[in] source - An ExternalSemaSource.
///
void MultiplexExternalSemaSource::addSource(ExternalSemaSource &source) {
  Sources.push_back(&source);
}

//===----------------------------------------------------------------------===//
// ExternalASTSource.
//===----------------------------------------------------------------------===//

Decl *MultiplexExternalSemaSource::GetExternalDecl(uint32_t ID) {
  for(size_t i = 0; i < Sources.size(); ++i)
    if (Decl *Result = Sources[i]->GetExternalDecl(ID))
      return Result;
  return 0;
}

Selector MultiplexExternalSemaSource::GetExternalSelector(uint32_t ID) {
  Selector Sel;
  for(size_t i = 0; i < Sources.size(); ++i) {
    Sel = Sources[i]->GetExternalSelector(ID);
    if (!Sel.isNull())
      return Sel;
  }
  return Sel;
}

uint32_t MultiplexExternalSemaSource::GetNumExternalSelectors() {
  uint32_t total = 0;
  for(size_t i = 0; i < Sources.size(); ++i)
    total += Sources[i]->GetNumExternalSelectors();
  return total;
}

Stmt *MultiplexExternalSemaSource::GetExternalDeclStmt(uint64_t Offset) {
  for(size_t i = 0; i < Sources.size(); ++i)
    if (Stmt *Result = Sources[i]->GetExternalDeclStmt(Offset))
      return Result;
  return 0;
}

CXXBaseSpecifier *MultiplexExternalSemaSource::GetExternalCXXBaseSpecifiers(
                                                               uint64_t Offset){
  for(size_t i = 0; i < Sources.size(); ++i)
    if (CXXBaseSpecifier *R = Sources[i]->GetExternalCXXBaseSpecifiers(Offset))
      return R;
  return 0; 
}

DeclContextLookupResult MultiplexExternalSemaSource::
FindExternalVisibleDeclsByName(const DeclContext *DC, DeclarationName Name) {
  StoredDeclsList DeclsFound;
  DeclContextLookupResult lookup;
  for(size_t i = 0; i < Sources.size(); ++i) {
    lookup = Sources[i]->FindExternalVisibleDeclsByName(DC, Name);
    while(lookup.first != lookup.second) {
      if (!DeclsFound.HandleRedeclaration(*lookup.first))
        DeclsFound.AddSubsequentDecl(*lookup.first);
      lookup.first++;
    }
  }
  return DeclsFound.getLookupResult(); 
}

void MultiplexExternalSemaSource::completeVisibleDeclsMap(const DeclContext *DC){
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->completeVisibleDeclsMap(DC);
}

ExternalLoadResult MultiplexExternalSemaSource::
FindExternalLexicalDecls(const DeclContext *DC,
                         bool (*isKindWeWant)(Decl::Kind),
                         SmallVectorImpl<Decl*> &Result) {
  for(size_t i = 0; i < Sources.size(); ++i)
    // FIXME: The semantics of the return result is unclear to me...
    Sources[i]->FindExternalLexicalDecls(DC, isKindWeWant, Result);

  return ELR_Success;
}

void MultiplexExternalSemaSource::FindFileRegionDecls(FileID File, 
                                                      unsigned Offset,
                                                      unsigned Length,
                                                SmallVectorImpl<Decl *> &Decls){
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->FindFileRegionDecls(File, Offset, Length, Decls);
}

void MultiplexExternalSemaSource::CompleteType(TagDecl *Tag) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->CompleteType(Tag);
}

void MultiplexExternalSemaSource::CompleteType(ObjCInterfaceDecl *Class) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->CompleteType(Class);
}

void MultiplexExternalSemaSource::ReadComments() {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadComments();
}

void MultiplexExternalSemaSource::StartedDeserializing() {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->StartedDeserializing();
}

void MultiplexExternalSemaSource::FinishedDeserializing() {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->FinishedDeserializing();
}

void MultiplexExternalSemaSource::StartTranslationUnit(ASTConsumer *Consumer) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->StartTranslationUnit(Consumer);
}

void MultiplexExternalSemaSource::PrintStats() {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->PrintStats();
}

bool MultiplexExternalSemaSource::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){
  for(size_t i = 0; i < Sources.size(); ++i)
    if (Sources[i]->layoutRecordType(Record, Size, Alignment, FieldOffsets, 
                                     BaseOffsets, VirtualBaseOffsets))
      return true;
  return false;
}

void MultiplexExternalSemaSource::
getMemoryBufferSizes(MemoryBufferSizes &sizes) const {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->getMemoryBufferSizes(sizes);

}

//===----------------------------------------------------------------------===//
// ExternalSemaSource.
//===----------------------------------------------------------------------===//


void MultiplexExternalSemaSource::InitializeSema(Sema &S) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->InitializeSema(S);
}

void MultiplexExternalSemaSource::ForgetSema() {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ForgetSema();
}

void MultiplexExternalSemaSource::ReadMethodPool(Selector Sel) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadMethodPool(Sel);
}

void MultiplexExternalSemaSource::ReadKnownNamespaces(
                                   SmallVectorImpl<NamespaceDecl*> &Namespaces){
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadKnownNamespaces(Namespaces);
}
  
bool MultiplexExternalSemaSource::LookupUnqualified(LookupResult &R, Scope *S){ 
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->LookupUnqualified(R, S);
  
  return !R.empty();
}

void MultiplexExternalSemaSource::ReadTentativeDefinitions(
                                     SmallVectorImpl<VarDecl*> &TentativeDefs) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadTentativeDefinitions(TentativeDefs);
}
  
void MultiplexExternalSemaSource::ReadUnusedFileScopedDecls(
                                SmallVectorImpl<const DeclaratorDecl*> &Decls) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadUnusedFileScopedDecls(Decls);
}
  
void MultiplexExternalSemaSource::ReadDelegatingConstructors(
                                  SmallVectorImpl<CXXConstructorDecl*> &Decls) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadDelegatingConstructors(Decls);
}

void MultiplexExternalSemaSource::ReadExtVectorDecls(
                                     SmallVectorImpl<TypedefNameDecl*> &Decls) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadExtVectorDecls(Decls);
}

void MultiplexExternalSemaSource::ReadDynamicClasses(
                                       SmallVectorImpl<CXXRecordDecl*> &Decls) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadDynamicClasses(Decls);
}

void MultiplexExternalSemaSource::ReadLocallyScopedExternalDecls(
                                           SmallVectorImpl<NamedDecl*> &Decls) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadLocallyScopedExternalDecls(Decls);
}

void MultiplexExternalSemaSource::ReadReferencedSelectors(
                  SmallVectorImpl<std::pair<Selector, SourceLocation> > &Sels) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadReferencedSelectors(Sels);
}

void MultiplexExternalSemaSource::ReadWeakUndeclaredIdentifiers(
                   SmallVectorImpl<std::pair<IdentifierInfo*, WeakInfo> > &WI) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadWeakUndeclaredIdentifiers(WI);
}

void MultiplexExternalSemaSource::ReadUsedVTables(
                                  SmallVectorImpl<ExternalVTableUse> &VTables) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadUsedVTables(VTables);
}

void MultiplexExternalSemaSource::ReadPendingInstantiations(
                                           SmallVectorImpl<std::pair<ValueDecl*,
                                                   SourceLocation> > &Pending) {
  for(size_t i = 0; i < Sources.size(); ++i)
    Sources[i]->ReadPendingInstantiations(Pending);
}