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Issue 7631020: Version 3.5.6. (Closed) Base URL: https://v8.googlecode.com/svn/trunk
Patch Set: Created 9 years, 4 months ago
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1 // Copyright 2011 the V8 project authors. All rights reserved. 1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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164 * dereferencing the handle (for instance, to extract the Object* from 164 * dereferencing the handle (for instance, to extract the Object* from
165 * a Handle<Object>); the value will still be governed by a handle 165 * a Handle<Object>); the value will still be governed by a handle
166 * behind the scenes and the same rules apply to these values as to 166 * behind the scenes and the same rules apply to these values as to
167 * their handles. 167 * their handles.
168 */ 168 */
169 template <class T> class Handle { 169 template <class T> class Handle {
170 public: 170 public:
171 /** 171 /**
172 * Creates an empty handle. 172 * Creates an empty handle.
173 */ 173 */
174 inline Handle(); 174 inline Handle() : val_(0) {}
175 175
176 /** 176 /**
177 * Creates a new handle for the specified value. 177 * Creates a new handle for the specified value.
178 */ 178 */
179 inline explicit Handle(T* val) : val_(val) { } 179 inline explicit Handle(T* val) : val_(val) {}
180 180
181 /** 181 /**
182 * Creates a handle for the contents of the specified handle. This 182 * Creates a handle for the contents of the specified handle. This
183 * constructor allows you to pass handles as arguments by value and 183 * constructor allows you to pass handles as arguments by value and
184 * to assign between handles. However, if you try to assign between 184 * to assign between handles. However, if you try to assign between
185 * incompatible handles, for instance from a Handle<String> to a 185 * incompatible handles, for instance from a Handle<String> to a
186 * Handle<Number> it will cause a compile-time error. Assigning 186 * Handle<Number> it will cause a compile-time error. Assigning
187 * between compatible handles, for instance assigning a 187 * between compatible handles, for instance assigning a
188 * Handle<String> to a variable declared as Handle<Value>, is legal 188 * Handle<String> to a variable declared as Handle<Value>, is legal
189 * because String is a subclass of Value. 189 * because String is a subclass of Value.
190 */ 190 */
191 template <class S> inline Handle(Handle<S> that) 191 template <class S> inline Handle(Handle<S> that)
192 : val_(reinterpret_cast<T*>(*that)) { 192 : val_(reinterpret_cast<T*>(*that)) {
193 /** 193 /**
194 * This check fails when trying to convert between incompatible 194 * This check fails when trying to convert between incompatible
195 * handles. For example, converting from a Handle<String> to a 195 * handles. For example, converting from a Handle<String> to a
196 * Handle<Number>. 196 * Handle<Number>.
197 */ 197 */
198 TYPE_CHECK(T, S); 198 TYPE_CHECK(T, S);
199 } 199 }
200 200
201 /** 201 /**
202 * Returns true if the handle is empty. 202 * Returns true if the handle is empty.
203 */ 203 */
204 inline bool IsEmpty() const { return val_ == 0; } 204 inline bool IsEmpty() const { return val_ == 0; }
205 205
206 /**
207 * Sets the handle to be empty. IsEmpty() will then return true.
208 */
209 inline void Clear() { val_ = 0; }
210
206 inline T* operator->() const { return val_; } 211 inline T* operator->() const { return val_; }
207 212
208 inline T* operator*() const { return val_; } 213 inline T* operator*() const { return val_; }
209 214
210 /** 215 /**
211 * Sets the handle to be empty. IsEmpty() will then return true.
212 */
213 inline void Clear() { this->val_ = 0; }
214
215 /**
216 * Checks whether two handles are the same. 216 * Checks whether two handles are the same.
217 * Returns true if both are empty, or if the objects 217 * Returns true if both are empty, or if the objects
218 * to which they refer are identical. 218 * to which they refer are identical.
219 * The handles' references are not checked. 219 * The handles' references are not checked.
220 */ 220 */
221 template <class S> inline bool operator==(Handle<S> that) const { 221 template <class S> inline bool operator==(Handle<S> that) const {
222 internal::Object** a = reinterpret_cast<internal::Object**>(**this); 222 internal::Object** a = reinterpret_cast<internal::Object**>(**this);
223 internal::Object** b = reinterpret_cast<internal::Object**>(*that); 223 internal::Object** b = reinterpret_cast<internal::Object**>(*that);
224 if (a == 0) return b == 0; 224 if (a == 0) return b == 0;
225 if (b == 0) return false; 225 if (b == 0) return false;
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3820 static inline bool CanCastToHeapObject(Object* o) { return true; } 3820 static inline bool CanCastToHeapObject(Object* o) { return true; }
3821 static inline bool CanCastToHeapObject(Message* o) { return true; } 3821 static inline bool CanCastToHeapObject(Message* o) { return true; }
3822 static inline bool CanCastToHeapObject(StackTrace* o) { return true; } 3822 static inline bool CanCastToHeapObject(StackTrace* o) { return true; }
3823 static inline bool CanCastToHeapObject(StackFrame* o) { return true; } 3823 static inline bool CanCastToHeapObject(StackFrame* o) { return true; }
3824 }; 3824 };
3825 3825
3826 } // namespace internal 3826 } // namespace internal
3827 3827
3828 3828
3829 template <class T> 3829 template <class T>
3830 Handle<T>::Handle() : val_(0) { }
3831
3832
3833 template <class T>
3834 Local<T>::Local() : Handle<T>() { } 3830 Local<T>::Local() : Handle<T>() { }
3835 3831
3836 3832
3837 template <class T> 3833 template <class T>
3838 Local<T> Local<T>::New(Handle<T> that) { 3834 Local<T> Local<T>::New(Handle<T> that) {
3839 if (that.IsEmpty()) return Local<T>(); 3835 if (that.IsEmpty()) return Local<T>();
3840 T* that_ptr = *that; 3836 T* that_ptr = *that;
3841 internal::Object** p = reinterpret_cast<internal::Object**>(that_ptr); 3837 internal::Object** p = reinterpret_cast<internal::Object**>(that_ptr);
3842 if (internal::Internals::CanCastToHeapObject(that_ptr)) { 3838 if (internal::Internals::CanCastToHeapObject(that_ptr)) {
3843 return Local<T>(reinterpret_cast<T*>(HandleScope::CreateHandle( 3839 return Local<T>(reinterpret_cast<T*>(HandleScope::CreateHandle(
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4201 4197
4202 4198
4203 } // namespace v8 4199 } // namespace v8
4204 4200
4205 4201
4206 #undef V8EXPORT 4202 #undef V8EXPORT
4207 #undef TYPE_CHECK 4203 #undef TYPE_CHECK
4208 4204
4209 4205
4210 #endif // V8_H_ 4206 #endif // V8_H_
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