// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef SRC_UTIL_H_
#define SRC_UTIL_H_

#include "v8.h"
#include <assert.h>
#include <stddef.h>
#include <stdlib.h>

namespace node {

#define OFFSET_OF(TypeName, Field)                                            \
  (reinterpret_cast<uintptr_t>(&(reinterpret_cast<TypeName*>(8)->Field)) - 8)

#define CONTAINER_OF(Pointer, TypeName, Field)                                \
  reinterpret_cast<TypeName*>(                                                \
      reinterpret_cast<uintptr_t>(Pointer) - OFFSET_OF(TypeName, Field))

#define FIXED_ONE_BYTE_STRING(isolate, string)                                \
  (node::OneByteString((isolate), (string), sizeof(string) - 1))

#define DISALLOW_COPY_AND_ASSIGN(TypeName)                                    \
  void operator=(const TypeName&);                                            \
  TypeName(const TypeName&)

#if defined(NDEBUG)
# define ASSERT(expression)
# define CHECK(expression)                                                    \
  do {                                                                        \
    if (!(expression)) abort();                                               \
  } while (0)
# define CHECK_EQ(a, b) CHECK((a) == (b))
# define CHECK_NE(a, b) CHECK((a) != (b))
#else
# define ASSERT(expression)  assert(expression)
# define CHECK(expression)   assert(expression)
# define CHECK_EQ(a, b)      assert((a) == (b))
# define CHECK_NE(a, b)      assert((a) != (b))
#endif

#define UNREACHABLE() abort()

// If persistent.IsWeak() == false, then do not call persistent.Dispose()
// while the returned Local<T> is still in scope, it will destroy the
// reference to the object.
template <class TypeName>
inline v8::Local<TypeName> PersistentToLocal(
    v8::Isolate* isolate,
    const v8::Persistent<TypeName>& persistent);

// Unchecked conversion from a non-weak Persistent<T> to Local<TLocal<T>,
// use with care!
//
// Do not call persistent.Dispose() while the returned Local<T> is still in
// scope, it will destroy the reference to the object.
template <class TypeName>
inline v8::Local<TypeName> StrongPersistentToLocal(
    const v8::Persistent<TypeName>& persistent);

template <class TypeName>
inline v8::Local<TypeName> WeakPersistentToLocal(
    v8::Isolate* isolate,
    const v8::Persistent<TypeName>& persistent);

// Convenience wrapper around v8::String::NewFromOneByte().
inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
                                           const char* data,
                                           int length = -1);

// For the people that compile with -funsigned-char.
inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
                                           const signed char* data,
                                           int length = -1);

inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
                                           const unsigned char* data,
                                           int length = -1);

inline void Wrap(v8::Local<v8::Object> object, void* pointer);

template <typename TypeName>
inline TypeName* Unwrap(v8::Local<v8::Object> object);

}  // namespace node

#endif  // SRC_UTIL_H_