//===--- ASTLambda.h - Lambda Helper Functions --------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file provides some common utility functions for processing
/// Lambda related AST Constructs.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_LAMBDA_H
#define LLVM_CLANG_AST_LAMBDA_H

#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclTemplate.h"

namespace clang {
inline StringRef getLambdaStaticInvokerName() {
  return "__invoke";
}
// This function returns true if M is a specialization, a template,
// or a non-generic lambda call operator.
inline bool isLambdaCallOperator(const CXXMethodDecl *MD) {
  const CXXRecordDecl *LambdaClass = MD->getParent();
  if (!LambdaClass || !LambdaClass->isLambda()) return false;
  return MD->getOverloadedOperator() == OO_Call;
}

inline bool isLambdaCallOperator(const DeclContext *DC) {
  if (!DC || !isa<CXXMethodDecl>(DC)) return false;
  return isLambdaCallOperator(cast<CXXMethodDecl>(DC));
}

inline bool isGenericLambdaCallOperatorSpecialization(CXXMethodDecl *MD) {
  if (!MD) return false;
  CXXRecordDecl *LambdaClass = MD->getParent();
  if (LambdaClass && LambdaClass->isGenericLambda())
    return isLambdaCallOperator(MD) && 
                    MD->isFunctionTemplateSpecialization();
  return false;
}

inline bool isLambdaConversionOperator(CXXConversionDecl *C) {
  return C ? C->getParent()->isLambda() : false;
}

inline bool isLambdaConversionOperator(Decl *D) {
  if (!D) return false;
  if (CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(D)) 
    return isLambdaConversionOperator(Conv);  
  if (FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(D)) 
    if (CXXConversionDecl *Conv = 
        dyn_cast_or_null<CXXConversionDecl>(F->getTemplatedDecl())) 
      return isLambdaConversionOperator(Conv);
  return false;
}

inline bool isGenericLambdaCallOperatorSpecialization(DeclContext *DC) {
  return isGenericLambdaCallOperatorSpecialization(
                                          dyn_cast<CXXMethodDecl>(DC));
}


// This returns the parent DeclContext ensuring that the correct
// parent DeclContext is returned for Lambdas
inline DeclContext *getLambdaAwareParentOfDeclContext(DeclContext *DC) {
  if (isLambdaCallOperator(DC))
    return DC->getParent()->getParent();
  else 
    return DC->getParent();
}

} // clang

#endif // LLVM_CLANG_AST_LAMBDA_H
