include/v8.h

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// Copyright 2007-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef V8_H_
#define V8_H_

#include <stdio.h>

#ifdef _WIN32
typedef int int32_t;
typedef unsigned int uint32_t;
typedef unsigned short uint16_t;  // NOLINT
typedef long long int64_t;  // NOLINT

// Setup for Windows DLL export/import. When building the V8 DLL the
// BUILDING_V8_SHARED needs to be defined. When building a program which uses
// the V8 DLL USING_V8_SHARED needs to be defined. When either building the V8
// static library or building a program which uses the V8 static library neither
// BUILDING_V8_SHARED nor USING_V8_SHARED should be defined.
// The reason for having both EXPORT and EXPORT_INLINE is that classes which
// have their code inside this header file needs to have __declspec(dllexport)
// when building the DLL but cannot have __declspec(dllimport) when building
// a program which uses the DLL.
#if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED)
#error both BUILDING_V8_SHARED and USING_V8_SHARED are set - please check the\
  build configuration to ensure that at most one of these is set
#endif

#ifdef BUILDING_V8_SHARED
#define EXPORT __declspec(dllexport)
#define EXPORT_INLINE __declspec(dllexport)
#elif USING_V8_SHARED
#define EXPORT __declspec(dllimport)
#define EXPORT_INLINE
#else
#define EXPORT
#define EXPORT_INLINE
#endif  // BUILDING_V8_SHARED

#else  // _WIN32

#include <stdint.h>

// Setup for Linux shared library export. There is no need to destinguish
// neither between building or using the V8 shared library nor between using
// the shared or static V8 library as there is on Windows. Therefore there is
// no checking of BUILDING_V8_SHARED and USING_V8_SHARED.
#if defined(__GNUC__) && (__GNUC__ >= 4)
#define EXPORT __attribute__ ((visibility("default")))
#define EXPORT_INLINE __attribute__ ((visibility("default")))
#else  // defined(__GNUC__) && (__GNUC__ >= 4)
#define EXPORT
#define EXPORT_INLINE
#endif  // defined(__GNUC__) && (__GNUC__ >= 4)

#endif  // _WIN32

namespace v8 {

class Context;
class String;
class Value;
class Utils;
class Number;
class Object;
class Array;
class Int32;
class Uint32;
class External;
class Primitive;
class Boolean;
class Integer;
class Function;
class Date;
class ImplementationUtilities;
class Signature;
template <class T> class Handle;
template <class T> class Local;
template <class T> class Persistent;
class FunctionTemplate;
class ObjectTemplate;
class Data;


// --- W e a k  H a n d l e s


typedef void (*WeakReferenceCallback)(Persistent<Value> object,
                                      void* parameter);


// --- H a n d l e s ---

#define TYPE_CHECK(T, S)                              \
  while (false) {                                     \
    *(static_cast<T**>(0)) = static_cast<S*>(0);      \
  }

template <class T> class EXPORT_INLINE Handle {
 public:

  Handle();

  explicit Handle(T* val) : val_(val) { }

  template <class S> inline Handle(Handle<S> that)
      : val_(reinterpret_cast<T*>(*that)) {
    TYPE_CHECK(T, S);
  }

  bool IsEmpty() { return val_ == 0; }

  T* operator->();

  T* operator*();

  void Clear() { this->val_ = 0; }

  template <class S> bool operator==(Handle<S> that) {
    void** a = reinterpret_cast<void**>(**this);
    void** b = reinterpret_cast<void**>(*that);
    if (a == 0) return b == 0;
    if (b == 0) return false;
    return *a == *b;
  }

  template <class S> bool operator!=(Handle<S> that) {
    return !operator==(that);
  }

  template <class S> static inline Handle<T> Cast(Handle<S> that) {
    if (that.IsEmpty()) return Handle<T>();
    return Handle<T>(T::Cast(*that));
  }

 private:
  T* val_;
};


template <class T> class EXPORT_INLINE Local : public Handle<T> {
 public:
  Local();
  template <class S> inline Local(Local<S> that)
      : Handle<T>(reinterpret_cast<T*>(*that)) {
    TYPE_CHECK(T, S);
  }
  template <class S> inline Local(S* that) : Handle<T>(that) { }
  template <class S> static inline Local<T> Cast(Local<S> that) {
    if (that.IsEmpty()) return Local<T>();
    return Local<T>(T::Cast(*that));
  }

  static Local<T> New(Handle<T> that);
};


template <class T> class EXPORT_INLINE Persistent : public Handle<T> {
 public:

  Persistent();

  template <class S> inline Persistent(Persistent<S> that)
      : Handle<T>(reinterpret_cast<T*>(*that)) {
    TYPE_CHECK(T, S);
  }

  template <class S> inline Persistent(S* that) : Handle<T>(that) { }

  template <class S> explicit inline Persistent(Handle<S> that)
      : Handle<T>(*that) { }

  template <class S> static inline Persistent<T> Cast(Persistent<S> that) {
    if (that.IsEmpty()) return Persistent<T>();
    return Persistent<T>(T::Cast(*that));
  }

  static Persistent<T> New(Handle<T> that);

  void Dispose();

  void MakeWeak(void* parameters, WeakReferenceCallback callback);

  void ClearWeak();

  bool IsNearDeath();

  bool IsWeak();

 private:
  friend class ImplementationUtilities;
  friend class ObjectTemplate;
};


class EXPORT HandleScope {
 public:
  HandleScope() : previous_(current_), is_closed_(false) {
    current_.extensions = 0;
  }

  ~HandleScope() {
    // TODO(1245391): In a perfect world, there would be a way of not
    // having to check for explicitly closed scopes maybe through
    // subclassing HandleScope?
    if (!is_closed_) RestorePreviousState();
  }

  template <class T> Local<T> Close(Handle<T> value);

  static int NumberOfHandles();

  static void** CreateHandle(void* value);

 private:
  // Make it impossible to create heap-allocated or illegal handle
  // scopes by disallowing certain operations.
  HandleScope(const HandleScope&);
  void operator=(const HandleScope&);
  void* operator new(size_t size);
  void operator delete(void*, size_t);

  class EXPORT Data {
   public:
    int extensions;
    void** next;
    void** limit;
    inline void Initialize() {
      extensions = -1;
      next = limit = NULL;
    }
  };

  static Data current_;
  const Data previous_;

  void RestorePreviousState() {
    if (current_.extensions > 0) DeleteExtensions();
    current_ = previous_;
#ifdef DEBUG
    ZapRange(current_.next, current_.limit);
#endif
  }

  // TODO(1245391): Consider creating a subclass for this.
  bool is_closed_;
  void** RawClose(void** value);

  static void DeleteExtensions();

  // Zaps the handles in the half-open interval [start, end).
  static void ZapRange(void** start, void** end);

  friend class ImplementationUtilities;
};


// --- S p e c i a l   o b j e c t s ---


class EXPORT Data {
 private:
  Data();
};


class EXPORT ScriptData {  // NOLINT
 public:
  virtual ~ScriptData() { }
  static ScriptData* PreCompile(const char* input, int length);
  static ScriptData* New(unsigned* data, int length);

  virtual int Length() = 0;
  virtual unsigned* Data() = 0;
};


class EXPORT ScriptOrigin {
 public:
  ScriptOrigin(Handle<Value> resource_name,
               Handle<Integer> resource_line_offset = Handle<Integer>(),
               Handle<Integer> resource_column_offset = Handle<Integer>())
      : resource_name_(resource_name),
        resource_line_offset_(resource_line_offset),
        resource_column_offset_(resource_column_offset) { }
  inline Handle<Value> ResourceName() const;
  inline Handle<Integer> ResourceLineOffset() const;
  inline Handle<Integer> ResourceColumnOffset() const;
 private:
  Handle<Value> resource_name_;
  Handle<Integer> resource_line_offset_;
  Handle<Integer> resource_column_offset_;
};


class EXPORT Script {
 public:

  static Local<Script> Compile(Handle<String> source,
                               ScriptOrigin* origin = NULL,
                               ScriptData* pre_data = NULL);

  static Local<Script> Compile(Handle<String> source,
                               Handle<Value> file_name);

  Local<Value> Run();
};


class EXPORT Message {
 public:
  Local<String> Get();
  Local<String> GetSourceLine();

  Handle<Value> GetScriptResourceName();

  int GetLineNumber();

  int GetStartPosition();

  int GetEndPosition();

  int GetStartColumn();

  int GetEndColumn();

  // TODO(1245381): Print to a string instead of on a FILE.
  static void PrintCurrentStackTrace(FILE* out);
};


// --- V a l u e ---


class EXPORT Value : public Data {
 public:

  bool IsUndefined();

  bool IsNull();

  bool IsTrue();

  bool IsFalse();

  bool IsString();

  bool IsFunction();

  bool IsArray();

  bool IsObject();

  bool IsBoolean();

  bool IsNumber();

  bool IsExternal();

  bool IsInt32();

  bool IsDate();

  Local<Boolean> ToBoolean();
  Local<Number> ToNumber();
  Local<String> ToString();
  Local<String> ToDetailString();
  Local<Object> ToObject();
  Local<Integer> ToInteger();
  Local<Uint32> ToUint32();
  Local<Int32> ToInt32();

  Local<Uint32> ToArrayIndex();

  bool BooleanValue();
  double NumberValue();
  int64_t IntegerValue();
  uint32_t Uint32Value();
  int32_t Int32Value();

  bool Equals(Handle<Value> that);
  bool StrictEquals(Handle<Value> that);
};


class EXPORT Primitive : public Value { };


class EXPORT Boolean : public Primitive {
 public:
  bool Value();
  static inline Handle<Boolean> New(bool value);
};


class EXPORT String : public Primitive {
 public:

  int Length();

  int Utf8Length();

  int Write(uint16_t* buffer, int start = 0, int length = -1);  // UTF-16
  int WriteAscii(char* buffer, int start = 0, int length = -1);  // ASCII
  int WriteUtf8(char* buffer, int length = -1); // UTF-8

  bool IsExternal();

  bool IsExternalAscii();
  class EXPORT ExternalStringResource {  // NOLINT
   public:
    virtual ~ExternalStringResource() {}
    virtual const uint16_t* data() const = 0;
    virtual size_t length() const = 0;
   protected:
    ExternalStringResource() {}
   private:
    // Disallow copying and assigning.
    ExternalStringResource(const ExternalStringResource&);
    void operator=(const ExternalStringResource&);
  };

  class EXPORT ExternalAsciiStringResource {  // NOLINT
   public:
    virtual ~ExternalAsciiStringResource() {}
    virtual const char* data() const = 0;
    virtual size_t length() const = 0;
   protected:
    ExternalAsciiStringResource() {}
   private:
    // Disallow copying and assigning.
    ExternalAsciiStringResource(const ExternalAsciiStringResource&);
    void operator=(const ExternalAsciiStringResource&);
  };

  ExternalStringResource* GetExternalStringResource();

  ExternalAsciiStringResource* GetExternalAsciiStringResource();

  static String* Cast(v8::Value* obj);

  static Local<String> New(const char* data, int length = -1);

  static Local<String> New(const uint16_t* data, int length = -1);

  static Local<String> NewSymbol(const char* data, int length = -1);

  static Local<String> NewExternal(ExternalStringResource* resource);

  static Local<String> NewExternal(ExternalAsciiStringResource* resource);

  static Local<String> NewUndetectable(const char* data, int length = -1);

  static Local<String> NewUndetectable(const uint16_t* data, int length = -1);

  class EXPORT Utf8Value {
   public:
    explicit Utf8Value(Handle<v8::Value> obj);
    ~Utf8Value();
    char* operator*() { return str_; }
    int length() { return length_; }
   private:
    char* str_;
    int length_;

    // Disallow copying and assigning.
    Utf8Value(const Utf8Value&);
    void operator=(const Utf8Value&);
  };

  class EXPORT AsciiValue {
   public:
    explicit AsciiValue(Handle<v8::Value> obj);
    ~AsciiValue();
    char* operator*() { return str_; }
    int length() { return length_; }
   private:
    char* str_;
    int length_;

    // Disallow copying and assigning.
    AsciiValue(const AsciiValue&);
    void operator=(const AsciiValue&);
  };

  class EXPORT Value {
   public:
    explicit Value(Handle<v8::Value> obj);
    ~Value();
    uint16_t* operator*() { return str_; }
    int length() { return length_; }
   private:
    uint16_t* str_;
    int length_;

    // Disallow copying and assigning.
    Value(const Value&);
    void operator=(const Value&);
  };
};


class EXPORT Number : public Primitive {
 public:
  double Value();
  static Local<Number> New(double value);
  static Number* Cast(v8::Value* obj);
 private:
  Number();
};


class EXPORT Integer : public Number {
 public:
  static Local<Integer> New(int32_t value);
  int64_t Value();
  static Integer* Cast(v8::Value* obj);
 private:
  Integer();
};


class EXPORT Int32 : public Integer {
 public:
  int32_t Value();
 private:
  Int32();
};


class EXPORT Uint32 : public Integer {
 public:
  uint32_t Value();
 private:
  Uint32();
};


class EXPORT Date : public Value {
 public:
  static Local<Value> New(double time);

  double NumberValue();

  static Date* Cast(v8::Value* obj);
};


enum PropertyAttribute {
  None       = 0,
  ReadOnly   = 1 << 0,
  DontEnum   = 1 << 1,
  DontDelete = 1 << 2
};

class EXPORT Object : public Value {
 public:
  bool Set(Handle<Value> key,
           Handle<Value> value,
           PropertyAttribute attribs = None);
  Local<Value> Get(Handle<Value> key);

  // TODO(1245389): Replace the type-specific versions of these
  // functions with generic ones that accept a Handle<Value> key.
  bool Has(Handle<String> key);
  bool Delete(Handle<String> key);
  bool Has(uint32_t index);
  bool Delete(uint32_t index);

  Local<Array> GetPropertyNames();

  Local<Value> GetPrototype();

  Local<String> ObjectProtoToString();

  int InternalFieldCount();
  Local<Value> GetInternalField(int index);
  void SetInternalField(int index, Handle<Value> value);

  // Testers for local properties.
  bool HasRealNamedProperty(Handle<String> key);
  bool HasRealIndexedProperty(uint32_t index);
  bool HasRealNamedCallbackProperty(Handle<String> key);

  Handle<Value> GetRealNamedPropertyInPrototypeChain(Handle<String> key);

  bool HasNamedLookupInterceptor();

  bool HasIndexedLookupInterceptor();

  void TurnOnAccessCheck();

  static Local<Object> New();
  static Object* Cast(Value* obj);
 private:
  Object();
};


class EXPORT Array : public Object {
 public:
  uint32_t Length();

  static Local<Array> New(int length = 0);
  static Array* Cast(Value* obj);
 private:
  Array();
};


class EXPORT Function : public Object {
 public:
  Local<Object> NewInstance();
  Local<Object> NewInstance(int argc, Handle<Value> argv[]);
  Local<Value> Call(Handle<Object> recv, int argc, Handle<Value> argv[]);
  void SetName(Handle<String> name);
  Handle<Value> GetName();
  static Function* Cast(Value* obj);
 private:
  Function();
};


class EXPORT External : public Value {
 public:
  static Local<External> New(void* value);
  static External* Cast(Value* obj);
  void* Value();
 private:
  External();
};


// --- T e m p l a t e s ---


class EXPORT Template : public Data {
 public:
  void Set(Handle<String> name, Handle<Data> value,
           PropertyAttribute attributes = None);
  inline void Set(const char* name, Handle<Data> value);
 private:
  Template();

  friend class ObjectTemplate;
  friend class FunctionTemplate;
};


class EXPORT Arguments {
 public:
  inline int Length() const;
  inline Local<Value> operator[](int i) const;
  inline Local<Function> Callee() const;
  inline Local<Object> This() const;
  inline Local<Object> Holder() const;
  inline bool IsConstructCall() const;
  inline Local<Value> Data() const;
 private:
  Arguments();
  friend class ImplementationUtilities;
  inline Arguments(Local<Value> data,
                   Local<Object> holder,
                   Local<Function> callee,
                   bool is_construct_call,
                   void** values, int length);
  Local<Value> data_;
  Local<Object> holder_;
  Local<Function> callee_;
  bool is_construct_call_;
  void** values_;
  int length_;
};


class EXPORT AccessorInfo {
 public:
  inline AccessorInfo(Local<Object> self,
                      Local<Value> data,
                      Local<Object> holder)
      : self_(self), data_(data), holder_(holder) { }
  inline Local<Value> Data() const;
  inline Local<Object> This() const;
  inline Local<Object> Holder() const;
 private:
  Local<Object> self_;
  Local<Value> data_;
  Local<Object> holder_;
};


typedef Handle<Value> (*InvocationCallback)(const Arguments& args);

typedef int (*LookupCallback)(Local<Object> self, Local<String> name);

typedef Handle<Value> (*AccessorGetter)(Local<String> property,
                                        const AccessorInfo& info);


typedef void (*AccessorSetter)(Local<String> property,
                               Local<Value> value,
                               const AccessorInfo& info);


typedef Handle<Value> (*NamedPropertyGetter)(Local<String> property,
                                             const AccessorInfo& info);


typedef Handle<Value> (*NamedPropertySetter)(Local<String> property,
                                             Local<Value> value,
                                             const AccessorInfo& info);


typedef Handle<Boolean> (*NamedPropertyQuery)(Local<String> property,
                                              const AccessorInfo& info);


typedef Handle<Boolean> (*NamedPropertyDeleter)(Local<String> property,
                                                const AccessorInfo& info);

typedef Handle<Array> (*NamedPropertyEnumerator)(const AccessorInfo& info);


typedef Handle<Value> (*IndexedPropertyGetter)(uint32_t index,
                                               const AccessorInfo& info);


typedef Handle<Value> (*IndexedPropertySetter)(uint32_t index,
                                               Local<Value> value,
                                               const AccessorInfo& info);


typedef Handle<Boolean> (*IndexedPropertyQuery)(uint32_t index,
                                                const AccessorInfo& info);

typedef Handle<Boolean> (*IndexedPropertyDeleter)(uint32_t index,
                                                  const AccessorInfo& info);

typedef Handle<Array> (*IndexedPropertyEnumerator)(const AccessorInfo& info);


enum AccessControl {
  DEFAULT         = 0,
  ALL_CAN_READ    = 1,
  ALL_CAN_WRITE   = 2
};


enum AccessType {
  ACCESS_GET,
  ACCESS_SET,
  ACCESS_HAS,
  ACCESS_DELETE,
  ACCESS_KEYS
};


typedef bool (*NamedSecurityCallback)(Local<Object> global,
                                      Local<Value> key,
                                      AccessType type,
                                      Local<Value> data);


typedef bool (*IndexedSecurityCallback)(Local<Object> global,
                                        uint32_t index,
                                        AccessType type,
                                        Local<Value> data);


class EXPORT FunctionTemplate : public Template {
 public:
  static Local<FunctionTemplate> New(
      InvocationCallback callback = 0,
      Handle<Value> data = Handle<Value>(),
      Handle<Signature> signature = Handle<Signature>());
  Local<Function> GetFunction();

  void SetCallHandler(InvocationCallback callback,
                      Handle<Value> data = Handle<Value>());

  Local<ObjectTemplate> InstanceTemplate();

  void Inherit(Handle<FunctionTemplate> parent);

  Local<ObjectTemplate> PrototypeTemplate();


  void SetClassName(Handle<String> name);

  void SetHiddenPrototype(bool value);

  bool HasInstance(Handle<Value> object);

 private:
  FunctionTemplate();
  void AddInstancePropertyAccessor(Handle<String> name,
                                   AccessorGetter getter,
                                   AccessorSetter setter,
                                   Handle<Value> data,
                                   AccessControl settings,
                                   PropertyAttribute attributes);
  void SetNamedInstancePropertyHandler(NamedPropertyGetter getter,
                                       NamedPropertySetter setter,
                                       NamedPropertyQuery query,
                                       NamedPropertyDeleter remover,
                                       NamedPropertyEnumerator enumerator,
                                       Handle<Value> data);
  void SetIndexedInstancePropertyHandler(IndexedPropertyGetter getter,
                                         IndexedPropertySetter setter,
                                         IndexedPropertyQuery query,
                                         IndexedPropertyDeleter remover,
                                         IndexedPropertyEnumerator enumerator,
                                         Handle<Value> data);
  void SetInstanceCallAsFunctionHandler(InvocationCallback callback,
                                        Handle<Value> data);

  friend class Context;
  friend class ObjectTemplate;
};


class EXPORT ObjectTemplate : public Template {
 public:
  static Local<ObjectTemplate> New();

  Local<Object> NewInstance();

  void SetAccessor(Handle<String> name,
                   AccessorGetter getter,
                   AccessorSetter setter = 0,
                   Handle<Value> data = Handle<Value>(),
                   AccessControl settings = DEFAULT,
                   PropertyAttribute attribute = None);

  void SetNamedPropertyHandler(NamedPropertyGetter getter,
                               NamedPropertySetter setter = 0,
                               NamedPropertyQuery query = 0,
                               NamedPropertyDeleter deleter = 0,
                               NamedPropertyEnumerator enumerator = 0,
                               Handle<Value> data = Handle<Value>());

  void SetIndexedPropertyHandler(IndexedPropertyGetter getter,
                                 IndexedPropertySetter setter = 0,
                                 IndexedPropertyQuery query = 0,
                                 IndexedPropertyDeleter deleter = 0,
                                 IndexedPropertyEnumerator enumerator = 0,
                                 Handle<Value> data = Handle<Value>());
  void SetCallAsFunctionHandler(InvocationCallback callback,
                                Handle<Value> data = Handle<Value>());

  void MarkAsUndetectable();

  void SetAccessCheckCallbacks(NamedSecurityCallback named_handler,
                               IndexedSecurityCallback indexed_handler,
                               Handle<Value> data = Handle<Value>(),
                               bool turned_on_by_default = true);

  int InternalFieldCount();

  void SetInternalFieldCount(int value);

 private:
  ObjectTemplate();
  static Local<ObjectTemplate> New(Handle<FunctionTemplate> constructor);
  friend class FunctionTemplate;
};


class EXPORT Signature : public Data {
 public:
  static Local<Signature> New(Handle<FunctionTemplate> receiver =
                                  Handle<FunctionTemplate>(),
                              int argc = 0,
                              Handle<FunctionTemplate> argv[] = 0);
 private:
  Signature();
};


class EXPORT TypeSwitch : public Data {
 public:
  static Local<TypeSwitch> New(Handle<FunctionTemplate> type);
  static Local<TypeSwitch> New(int argc, Handle<FunctionTemplate> types[]);
  int match(Handle<Value> value);
 private:
  TypeSwitch();
};


// --- E x t e n s i o n s ---


class EXPORT Extension {  // NOLINT
 public:
  Extension(const char* name,
            const char* source = 0,
            int dep_count = 0,
            const char** deps = 0);
  virtual ~Extension() { }
  virtual v8::Handle<v8::FunctionTemplate>
      GetNativeFunction(v8::Handle<v8::String> name) {
    return v8::Handle<v8::FunctionTemplate>();
  }

  const char* name() { return name_; }
  const char* source() { return source_; }
  int dependency_count() { return dep_count_; }
  const char** dependencies() { return deps_; }
  void set_auto_enable(bool value) { auto_enable_ = value; }
  bool auto_enable() { return auto_enable_; }

 private:
  const char* name_;
  const char* source_;
  int dep_count_;
  const char** deps_;
  bool auto_enable_;

  // Disallow copying and assigning.
  Extension(const Extension&);
  void operator=(const Extension&);
};


void EXPORT RegisterExtension(Extension* extension);


class EXPORT DeclareExtension {
 public:
  inline DeclareExtension(Extension* extension) {
    RegisterExtension(extension);
  }
};


// --- S t a t i c s ---


Handle<Primitive> EXPORT Undefined();
Handle<Primitive> EXPORT Null();
Handle<Boolean> EXPORT True();
Handle<Boolean> EXPORT False();


class EXPORT ResourceConstraints {
 public:
  ResourceConstraints();
  int max_young_space_size() const { return max_young_space_size_; }
  void set_max_young_space_size(int value) { max_young_space_size_ = value; }
  int max_old_space_size() const { return max_old_space_size_; }
  void set_max_old_space_size(int value) { max_old_space_size_ = value; }
  uint32_t* stack_limit() const { return stack_limit_; }
  void set_stack_limit(uint32_t* value) { stack_limit_ = value; }
 private:
  int max_young_space_size_;
  int max_old_space_size_;
  uint32_t* stack_limit_;
};


bool SetResourceConstraints(ResourceConstraints* constraints);


// --- E x c e p t i o n s ---


typedef void (*FatalErrorCallback)(const char* location, const char* message);


typedef void (*MessageCallback)(Handle<Message> message, Handle<Value> data);


Handle<Value> EXPORT ThrowException(Handle<Value> exception);

class EXPORT Exception {
 public:
  static Local<Value> RangeError(Handle<String> message);
  static Local<Value> ReferenceError(Handle<String> message);
  static Local<Value> SyntaxError(Handle<String> message);
  static Local<Value> TypeError(Handle<String> message);
  static Local<Value> Error(Handle<String> message);
};


// --- C o u n t e r s  C a l l b a c k s

typedef int* (*CounterLookupCallback)(const wchar_t* name);

// --- F a i l e d A c c e s s C h e c k C a l l b a c k ---
typedef void (*FailedAccessCheckCallback)(Local<Object> target,
                                          AccessType type,
                                          Local<Value> data);

// --- G a r b a g e C o l l e c t i o n  C a l l b a c k s

typedef void (*GCCallback)();


//  --- C o n t e x t  G e n e r a t o r

typedef Persistent<Context> (*ContextGenerator)();


class EXPORT V8 {
 public:
  static void SetFatalErrorHandler(FatalErrorCallback that);

  static void IgnoreOutOfMemoryException();

  static bool IsDead();

  static bool AddMessageListener(MessageCallback that,
                                 Handle<Value> data = Handle<Value>());

  static void RemoveMessageListeners(MessageCallback that);

  static void SetFlagsFromString(const char* str, int length);

  static void SetFlagsFromCommandLine(int* argc,
                                      char** argv,
                                      bool remove_flags);

  static const char* GetVersion();

  static void SetCounterFunction(CounterLookupCallback);

  static void EnableSlidingStateWindow();

  static void SetFailedAccessCheckCallbackFunction(FailedAccessCheckCallback);

  static void SetGlobalGCPrologueCallback(GCCallback);

  static void SetGlobalGCEpilogueCallback(GCCallback);

  static void AddObjectToGroup(void* id, Persistent<Object> obj);

  static bool Initialize();

  static int AdjustAmountOfExternalAllocatedMemory(int change_in_bytes);

 private:
  V8();

  static void** GlobalizeReference(void** handle);
  static void DisposeGlobal(void** global_handle);
  static void MakeWeak(void** global_handle, void* data, WeakReferenceCallback);
  static void ClearWeak(void** global_handle);
  static bool IsGlobalNearDeath(void** global_handle);
  static bool IsGlobalWeak(void** global_handle);

  template <class T> friend class Handle;
  template <class T> friend class Local;
  template <class T> friend class Persistent;
  friend class Context;
};


class EXPORT TryCatch {
 public:

  TryCatch();

  ~TryCatch();

  bool HasCaught() const;

  Local<Value> Exception() const;

  Local<v8::Message> Message() const;

  void Reset();

  void SetVerbose(bool value);

  void SetCaptureMessage(bool value);

 public:
  TryCatch* next_;
  void* exception_;
  void* message_;
  bool is_verbose_;
  bool capture_message_;
};


// --- C o n t e x t ---


class EXPORT ExtensionConfiguration {
 public:
  ExtensionConfiguration(int name_count, const char* names[])
      : name_count_(name_count), names_(names) { }
 private:
  friend class ImplementationUtilities;
  int name_count_;
  const char** names_;
};


class EXPORT Context {
 public:
  Local<Object> Global();

  void DetachGlobal();

  static Persistent<Context> New(
      ExtensionConfiguration* extensions = 0,
      Handle<ObjectTemplate> global_template = Handle<ObjectTemplate>(),
      Handle<Value> global_object = Handle<Value>());

  static Local<Context> GetEntered();

  static Local<Context> GetCurrent();

  void SetSecurityToken(Handle<Value> token);

  void UseDefaultSecurityToken();

  Handle<Value> GetSecurityToken();

  void Enter();

  void Exit();

  bool HasOutOfMemoryException();

  static bool InContext();

  class EXPORT Scope {
   public:
    inline Scope(Handle<Context> context) : context_(context) {
      context_->Enter();
    }
    inline ~Scope() { context_->Exit(); }
   private:
    Handle<Context> context_;
  };

 private:
  friend class Value;
  friend class Script;
  friend class Object;
  friend class Function;
};


class EXPORT Unlocker {
 public:
  Unlocker();
  ~Unlocker();
};


class EXPORT Locker {
 public:
  Locker();
  ~Locker();

  static void StartPreemption(int every_n_ms);

  static void StopPreemption();

  static bool IsLocked();

 private:
  bool has_lock_;
  bool top_level_;

  // Disallow copying and assigning.
  Locker(const Locker&);
  void operator=(const Locker&);
};



// --- I m p l e m e n t a t i o n ---

template <class T>
Handle<T>::Handle() : val_(0) { }


template <class T>
Local<T>::Local() : Handle<T>() { }


template <class T>
Local<T> Local<T>::New(Handle<T> that) {
  if (that.IsEmpty()) return Local<T>();
  void** p = reinterpret_cast<void**>(*that);
  return Local<T>(reinterpret_cast<T*>(HandleScope::CreateHandle(*p)));
}


template <class T>
Persistent<T> Persistent<T>::New(Handle<T> that) {
  if (that.IsEmpty()) return Persistent<T>();
  void** p = reinterpret_cast<void**>(*that);
  return Persistent<T>(reinterpret_cast<T*>(V8::GlobalizeReference(p)));
}


template <class T>
bool Persistent<T>::IsNearDeath() {
  if (this->IsEmpty()) return false;
  return V8::IsGlobalNearDeath(reinterpret_cast<void**>(**this));
}


template <class T>
bool Persistent<T>::IsWeak() {
  if (this->IsEmpty()) return false;
  return V8::IsGlobalWeak(reinterpret_cast<void**>(**this));
}


template <class T>
void Persistent<T>::Dispose() {
  if (this->IsEmpty()) return;
  V8::DisposeGlobal(reinterpret_cast<void**>(**this));
}


template <class T>
Persistent<T>::Persistent() : Handle<T>() { }

template <class T>
void Persistent<T>::MakeWeak(void* parameters, WeakReferenceCallback callback) {
  V8::MakeWeak(reinterpret_cast<void**>(**this), parameters, callback);
}

template <class T>
void Persistent<T>::ClearWeak() {
  V8::ClearWeak(reinterpret_cast<void**>(**this));
}

template <class T>
T* Handle<T>::operator->() {
  return val_;
}


template <class T>
T* Handle<T>::operator*() {
  return val_;
}


Local<Value> Arguments::operator[](int i) const {
  if (i < 0 || length_ <= i) return Local<Value>(*Undefined());
  return Local<Value>(reinterpret_cast<Value*>(values_ - i));
}


Local<Function> Arguments::Callee() const {
  return callee_;
}


Local<Object> Arguments::This() const {
  return Local<Object>(reinterpret_cast<Object*>(values_ + 1));
}


Local<Object> Arguments::Holder() const {
  return holder_;
}


Local<Value> Arguments::Data() const {
  return data_;
}


bool Arguments::IsConstructCall() const {
  return is_construct_call_;
}


int Arguments::Length() const {
  return length_;
}


Local<Value> AccessorInfo::Data() const {
  return data_;
}


Local<Object> AccessorInfo::This() const {
  return self_;
}


Local<Object> AccessorInfo::Holder() const {
  return holder_;
}


template <class T>
Local<T> HandleScope::Close(Handle<T> value) {
  void** after = RawClose(reinterpret_cast<void**>(*value));
  return Local<T>(reinterpret_cast<T*>(after));
}

Handle<Value> ScriptOrigin::ResourceName() const {
  return resource_name_;
}


Handle<Integer> ScriptOrigin::ResourceLineOffset() const {
  return resource_line_offset_;
}


Handle<Integer> ScriptOrigin::ResourceColumnOffset() const {
  return resource_column_offset_;
}


Handle<Boolean> Boolean::New(bool value) {
  return value ? True() : False();
}


void Template::Set(const char* name, v8::Handle<Data> value) {
  Set(v8::String::New(name), value);
}


}  // namespace v8


#undef EXPORT
#undef EXPORT_INLINE
#undef TYPE_CHECK


#endif  // V8_H_