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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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