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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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88 | 88 |
89 // Closes the given scope, but lets this handle escape. See | 89 // Closes the given scope, but lets this handle escape. See |
90 // implementation in api.h. | 90 // implementation in api.h. |
91 inline Handle<T> EscapeFrom(v8::HandleScope* scope); | 91 inline Handle<T> EscapeFrom(v8::HandleScope* scope); |
92 | 92 |
93 private: | 93 private: |
94 T** location_; | 94 T** location_; |
95 }; | 95 }; |
96 | 96 |
97 | 97 |
98 class HandleScopeImplementer; | |
99 | |
100 | |
101 // A stack-allocated class that governs a number of local handles. | 98 // A stack-allocated class that governs a number of local handles. |
102 // After a handle scope has been created, all local handles will be | 99 // After a handle scope has been created, all local handles will be |
103 // allocated within that handle scope until either the handle scope is | 100 // allocated within that handle scope until either the handle scope is |
104 // deleted or another handle scope is created. If there is already a | 101 // deleted or another handle scope is created. If there is already a |
105 // handle scope and a new one is created, all allocations will take | 102 // handle scope and a new one is created, all allocations will take |
106 // place in the new handle scope until it is deleted. After that, | 103 // place in the new handle scope until it is deleted. After that, |
107 // new handles will again be allocated in the original handle scope. | 104 // new handles will again be allocated in the original handle scope. |
108 // | 105 // |
109 // After the handle scope of a local handle has been deleted the | 106 // After the handle scope of a local handle has been deleted the |
110 // garbage collector will no longer track the object stored in the | 107 // garbage collector will no longer track the object stored in the |
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153 Object** prev_next_; | 150 Object** prev_next_; |
154 Object** prev_limit_; | 151 Object** prev_limit_; |
155 | 152 |
156 // Extend the handle scope making room for more handles. | 153 // Extend the handle scope making room for more handles. |
157 static internal::Object** Extend(); | 154 static internal::Object** Extend(); |
158 | 155 |
159 // Zaps the handles in the half-open interval [start, end). | 156 // Zaps the handles in the half-open interval [start, end). |
160 static void ZapRange(internal::Object** start, internal::Object** end); | 157 static void ZapRange(internal::Object** start, internal::Object** end); |
161 | 158 |
162 friend class v8::HandleScope; | 159 friend class v8::HandleScope; |
163 friend class v8::internal::HandleScopeImplementer; | |
164 friend class v8::ImplementationUtilities; | 160 friend class v8::ImplementationUtilities; |
165 }; | 161 }; |
166 | 162 |
167 | 163 |
168 class DeferredHandles; | |
169 | |
170 | |
171 class DeferredHandleScope { | |
172 public: | |
173 explicit DeferredHandleScope(Isolate* isolate); | |
174 // The DeferredHandles object returned stores the Handles created | |
175 // since the creation of this DeferredHandleScope. The Handles are | |
176 // alive as long as the DeferredHandles object is alive. | |
177 DeferredHandles* Detach(); | |
178 ~DeferredHandleScope(); | |
179 | |
180 private: | |
181 Object** prev_limit_; | |
182 Object** prev_next_; | |
183 HandleScopeImplementer* impl_; | |
184 | |
185 #ifdef DEBUG | |
186 bool handles_detached_; | |
187 int prev_level_; | |
188 #endif | |
189 | |
190 friend class HandleScopeImplementer; | |
191 }; | |
192 | |
193 | |
194 // ---------------------------------------------------------------------------- | 164 // ---------------------------------------------------------------------------- |
195 // Handle operations. | 165 // Handle operations. |
196 // They might invoke garbage collection. The result is an handle to | 166 // They might invoke garbage collection. The result is an handle to |
197 // an object of expected type, or the handle is an error if running out | 167 // an object of expected type, or the handle is an error if running out |
198 // of space or encountering an internal error. | 168 // of space or encountering an internal error. |
199 | 169 |
200 // Flattens a string. | 170 // Flattens a string. |
201 void FlattenString(Handle<String> str); | 171 void FlattenString(Handle<String> str); |
202 | 172 |
203 // Flattens a string and returns the underlying external or sequential | 173 // Flattens a string and returns the underlying external or sequential |
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323 inline NoHandleAllocation(); | 293 inline NoHandleAllocation(); |
324 inline ~NoHandleAllocation(); | 294 inline ~NoHandleAllocation(); |
325 private: | 295 private: |
326 int level_; | 296 int level_; |
327 #endif | 297 #endif |
328 }; | 298 }; |
329 | 299 |
330 } } // namespace v8::internal | 300 } } // namespace v8::internal |
331 | 301 |
332 #endif // V8_HANDLES_H_ | 302 #endif // V8_HANDLES_H_ |
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