////////////////////////////////////////////////////////////////////////////////
//
// The University of Illinois/NCSA
// Open Source License (NCSA)
// 
// Copyright (c) 2014-2015, Advanced Micro Devices, Inc. All rights reserved.
// 
// Developed by:
// 
//                 AMD Research and AMD HSA Software Development
// 
//                 Advanced Micro Devices, Inc.
// 
//                 www.amd.com
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////////////////////////////////////////////////////////////////////////////////

#ifndef HSA_RUNTME_CORE_INC_CHECKED_H_
#define HSA_RUNTME_CORE_INC_CHECKED_H_

#include <stdint.h>
#include <stdlib.h>

namespace core {

/// @brief Compares type codes and pointers to check object validity.  Used for cast validation.
template <uint64_t code, bool multiProcess = false> class Check final {
 public:
  typedef Check<code> CheckType;

  Check() { object_ = uintptr_t(this) ^ uintptr_t(code); }
  Check(const Check&) { object_ = uintptr_t(this) ^ uintptr_t(code); }
  Check(Check&&) { object_ = uintptr_t(this) ^ uintptr_t(code); }

  ~Check() { object_ = NULL; }

  const Check& operator=(Check&& rhs) { return *this; }
  const Check& operator=(const Check& rhs) { return *this; }

  bool IsValid() const {
    return object_ == (uintptr_t(this) ^ uintptr_t(code));
  }

  uint64_t check_code() const { return code; }

 private:
  uintptr_t object_;
};

template <uint64_t code> class Check<code, true> final {
 public:
  typedef Check<code> CheckType;

  Check() { object_ = uintptr_t(code); }
  Check(const Check&) { object_ = uintptr_t(code); }
  Check(Check&&) { object_ = uintptr_t(code); }

  const Check& operator=(Check&& rhs) { return *this; }
  const Check& operator=(const Check& rhs) { return *this; }

  bool IsValid() const { return object_ == uintptr_t(code); }

  uint64_t check_code() const { return code; }

 private:
  uintptr_t object_;
};

/// @brief Base class for validating objects.
template <uint64_t code> class Checked {
 public:
  typedef Checked<code> CheckedType;

  bool IsValid() const { return id.IsValid(); }

  virtual ~Checked() {}

 private:
  Check<code, false> id;
};

}  // namespace core
#endif  // header guard