kmp_utils.h

/*
 * kmp_utils.h -- Utilities that used internally
 */
 
//===----------------------------------------------------------------------===//
//
// 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 __KMP_UTILS_H__
#define __KMP_UTILS_H__
 
#include <cstddef>
 
#include "kmp.h"

template <typename T, unsigned N = 8> class SimpleVLA final {
  T StackBuffer[N];
  T *HeapBuffer = nullptr;
  T *Ptr = StackBuffer;
 
public:
  SimpleVLA() = delete;
  SimpleVLA(const SimpleVLA &) = delete;
  SimpleVLA(SimpleVLA &&) = delete;
  SimpleVLA &operator=(const SimpleVLA &) = delete;
  SimpleVLA &operator=(SimpleVLA &&) = delete;
 
  explicit SimpleVLA(unsigned NumOfElements) noexcept {
    if (NumOfElements > N) {
      HeapBuffer =
          reinterpret_cast<T *>(__kmp_allocate(NumOfElements * sizeof(T)));
      Ptr = HeapBuffer;
    }
  }
 
  ~SimpleVLA() {
    if (HeapBuffer)
      __kmp_free(HeapBuffer);
  }
 
  operator T *() noexcept { return Ptr; }
  operator const T *() const noexcept { return Ptr; }
};
 
#endif