text: /*
   * Copyright 2016 WebAssembly Community Group participants
   *
   * 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 wasm_support_utilities_h
  #define wasm_support_utilities_h
  
  #include "compiler-support.h"
  
  #include <cassert>
  #include <cstdint>
  #include <cstring>
  #include <memory>
  #include <iostream>
  #include <type_traits>
  
  namespace wasm {
  
  // Type punning needs to be done through this function to avoid undefined
  // behavior: unions and reinterpret_cast aren't valid approaches.
  template <class Destination, class Source>
  inline Destination bit_cast(const Source& source) {
    static_assert(sizeof(Destination) == sizeof(Source),
                  "bit_cast needs to be between types of the same size");
    static_assert(std::is_pod<Destination>::value, "non-POD bit_cast undefined");
    static_assert(std::is_pod<Source>::value, "non-POD bit_cast undefined");
    Destination destination;
    std::memcpy(&destination, &source, sizeof(destination));
    return destination;
  }
  
  inline bool isPowerOf2(uint32_t v) {
    return v && !(v & (v - 1));
  }
  
  inline size_t alignAddr(size_t address, size_t alignment) {
    assert(alignment && isPowerOf2((uint32_t)alignment) &&
           "Alignment is not a power of two!");
  
    assert(address + alignment - 1 >= address);
  
    return ((address + alignment - 1) & ~(alignment - 1));
  }
  
  template<typename T, typename... Args>
  std::unique_ptr<T> make_unique(Args&&... args)
  {
      return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
  }
  
  // For fatal errors which could arise from input (i.e. not assertion failures)
  class Fatal {
   public:
    Fatal() {
      std::cerr << "Fatal: ";
    }
    template<typename T>
    Fatal &operator<<(T arg) {
      std::cerr << arg;
      return *this;
    }
    WASM_NORETURN ~Fatal() {
      std::cerr << "\n";
      exit(1);
    }
  };
  
  
  }  // namespace wasm
  
  #endif   // wasm_support_utilities_h
  