#ifndef LLVM_CLANG_AST_INTERP_FUNCTION_POINTER_H

#define LLVM_CLANG_AST_INTERP_FUNCTION_POINTER_H

#include "Function.h"

#include "Primitives.h"

#include "clang/AST/APValue.h"

namespace clang {

class ASTContext;

namespace interp {

class FunctionPointer final {

private:

  const Function *Func;

public:

  FunctionPointer() : Func(nullptr) {}

  FunctionPointer(const Function *Func) : Func(Func) { assert(Func); }

  const Function *getFunction() const { return Func; }

  APValue toAPValue() const {

    if (!Func)

      return APValue(static_cast<Expr *>(nullptr), CharUnits::Zero(), {},

                     /*OnePastTheEnd=*/false, /*IsNull=*/true);

    return APValue(Func->getDecl(), CharUnits::Zero(), {},

                   /*OnePastTheEnd=*/false, /*IsNull=*/false);

  }

  void print(llvm::raw_ostream &OS) const {

    OS << "FnPtr(";

    if (Func)

      OS << Func->getName();

    else

      OS << "nullptr";

    OS << ")";

  }

  std::string toDiagnosticString(const ASTContext &Ctx) const {

    if (!Func)

      return "nullptr";

    return toAPValue().getAsString(Ctx, Func->getDecl()->getType());

  }

  ComparisonCategoryResult compare(const FunctionPointer &RHS) const {

    if (Func == RHS.Func)

      return ComparisonCategoryResult::Equal;

    return ComparisonCategoryResult::Unordered;

  }

};

inline llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,

                                     FunctionPointer FP) {

  FP.print(OS);

  return OS;

}

} // namespace interp

} // namespace clang

#endif