/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *****************************************************************************/

#ifndef CYBER_BASE_MACROS_H_
#define CYBER_BASE_MACROS_H_

#include <cstdlib>
#include <new>

#if __GNUC__ >= 3
#define likely(x) (__builtin_expect((x), 1))
#define unlikely(x) (__builtin_expect((x), 0))
#else
#define likely(x) (x)
#define unlikely(x) (x)
#endif

#define CACHELINE_SIZE 64

#define DEFINE_TYPE_TRAIT(name, func)                            \
  template <typename T>                                          \
  class name {                                                   \
   private:                                                      \
    template <typename Class>                                    \
    static char Test(decltype(&Class::func)*);                   \
    template <typename>                                          \
    static int Test(...);                                        \
                                                                 \
   public:                                                       \
    static constexpr bool value = sizeof(Test<T>(nullptr)) == 1; \
  };                                                             \
                                                                 \
  template <typename T>                                          \
  constexpr bool name<T>::value;

inline void cpu_relax() {
#if defined(__aarch64__)
  asm volatile("yield" ::: "memory");
#else
  asm volatile("rep; nop" ::: "memory");
#endif
}

inline void* CheckedMalloc(size_t size) {
  void* ptr = std::malloc(size);
  if (!ptr) {
    throw std::bad_alloc();
  }
  return ptr;
}

inline void* CheckedCalloc(size_t num, size_t size) {
  void* ptr = std::calloc(num, size);
  if (!ptr) {
    throw std::bad_alloc();
  }
  return ptr;
}

#endif  // CYBER_BASE_MACROS_H_
