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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 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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114 ~HandleScope() { | 114 ~HandleScope() { |
115 Leave(&previous_); | 115 Leave(&previous_); |
116 } | 116 } |
117 | 117 |
118 // Counts the number of allocated handles. | 118 // Counts the number of allocated handles. |
119 static int NumberOfHandles(); | 119 static int NumberOfHandles(); |
120 | 120 |
121 // Creates a new handle with the given value. | 121 // Creates a new handle with the given value. |
122 template <typename T> | 122 template <typename T> |
123 static inline T** CreateHandle(T* value) { | 123 static inline T** CreateHandle(T* value) { |
124 void** cur = current_.next; | 124 internal::Object** cur = current_.next; |
125 if (cur == current_.limit) cur = Extend(); | 125 if (cur == current_.limit) cur = Extend(); |
126 // Update the current next field, set the value in the created | 126 // Update the current next field, set the value in the created |
127 // handle, and return the result. | 127 // handle, and return the result. |
128 ASSERT(cur < current_.limit); | 128 ASSERT(cur < current_.limit); |
129 current_.next = cur + 1; | 129 current_.next = cur + 1; |
130 | 130 |
131 T** result = reinterpret_cast<T**>(cur); | 131 T** result = reinterpret_cast<T**>(cur); |
132 *result = value; | 132 *result = value; |
133 return result; | 133 return result; |
134 } | 134 } |
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157 if (current_.extensions > 0) { | 157 if (current_.extensions > 0) { |
158 DeleteExtensions(); | 158 DeleteExtensions(); |
159 } | 159 } |
160 current_ = *previous; | 160 current_ = *previous; |
161 #ifdef DEBUG | 161 #ifdef DEBUG |
162 ZapRange(current_.next, current_.limit); | 162 ZapRange(current_.next, current_.limit); |
163 #endif | 163 #endif |
164 } | 164 } |
165 | 165 |
166 // Extend the handle scope making room for more handles. | 166 // Extend the handle scope making room for more handles. |
167 static void** Extend(); | 167 static internal::Object** Extend(); |
168 | 168 |
169 // Deallocates any extensions used by the current scope. | 169 // Deallocates any extensions used by the current scope. |
170 static void DeleteExtensions(); | 170 static void DeleteExtensions(); |
171 | 171 |
172 // Zaps the handles in the half-open interval [start, end). | 172 // Zaps the handles in the half-open interval [start, end). |
173 static void ZapRange(void** start, void** end); | 173 static void ZapRange(internal::Object** start, internal::Object** end); |
174 | 174 |
175 friend class v8::HandleScope; | 175 friend class v8::HandleScope; |
176 friend class v8::ImplementationUtilities; | 176 friend class v8::ImplementationUtilities; |
177 }; | 177 }; |
178 | 178 |
179 | 179 |
180 // ---------------------------------------------------------------------------- | 180 // ---------------------------------------------------------------------------- |
181 // Handle operations. | 181 // Handle operations. |
182 // They might invoke garbage collection. The result is an handle to | 182 // They might invoke garbage collection. The result is an handle to |
183 // an object of expected type, or the handle is an error if running out | 183 // an object of expected type, or the handle is an error if running out |
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346 private: | 346 private: |
347 bool has_been_transformed_; // Tells whether the object has been transformed. | 347 bool has_been_transformed_; // Tells whether the object has been transformed. |
348 int unused_property_fields_; // Captures the unused number of field. | 348 int unused_property_fields_; // Captures the unused number of field. |
349 Handle<JSObject> object_; // The object being optimized. | 349 Handle<JSObject> object_; // The object being optimized. |
350 }; | 350 }; |
351 | 351 |
352 | 352 |
353 } } // namespace v8::internal | 353 } } // namespace v8::internal |
354 | 354 |
355 #endif // V8_HANDLES_H_ | 355 #endif // V8_HANDLES_H_ |
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