//===--- FunctionPointer.h - Types for the constexpr VM ---------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_INTERP_FUNCTION_POINTER_H
#define LLVM_CLANG_AST_INTERP_FUNCTION_POINTER_H

#include "Function.h"
#include "Primitives.h"

namespace clang {
class ASTContext;
class APValue;
namespace interp {

class FunctionPointer final {
private:
  const Function *Func;

public:
  FunctionPointer() = default;
  FunctionPointer(const Function *Func) : Func(Func) {}

  const Function *getFunction() const { return Func; }
  bool isZero() const { return !Func; }
  bool isWeak() const {
    if (!Func || !Func->getDecl())
      return false;

    return Func->getDecl()->isWeak();
  }

  APValue toAPValue(const ASTContext &) const;
  void print(llvm::raw_ostream &OS) const;

  std::string toDiagnosticString(const ASTContext &Ctx) const {
    if (!Func)
      return "nullptr";

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

  uint64_t getIntegerRepresentation() const {
    return static_cast<uint64_t>(reinterpret_cast<uintptr_t>(Func));
  }
};

} // namespace interp
} // namespace clang

#endif