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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef V8_CONTEXTS_H_ | 5 #ifndef V8_CONTEXTS_H_ |
6 #define V8_CONTEXTS_H_ | 6 #define V8_CONTEXTS_H_ |
7 | 7 |
8 #include "src/heap/heap.h" | 8 #include "src/heap/heap.h" |
9 #include "src/objects.h" | 9 #include "src/objects.h" |
10 | 10 |
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222 // valid information about its location. | 222 // valid information about its location. |
223 // If it returns false, `result` is untouched. | 223 // If it returns false, `result` is untouched. |
224 MUST_USE_RESULT | 224 MUST_USE_RESULT |
225 static bool Lookup(Handle<GlobalContextTable> table, Handle<String> name, | 225 static bool Lookup(Handle<GlobalContextTable> table, Handle<String> name, |
226 LookupResult* result); | 226 LookupResult* result); |
227 | 227 |
228 MUST_USE_RESULT | 228 MUST_USE_RESULT |
229 static Handle<GlobalContextTable> Extend(Handle<GlobalContextTable> table, | 229 static Handle<GlobalContextTable> Extend(Handle<GlobalContextTable> table, |
230 Handle<Context> global_context); | 230 Handle<Context> global_context); |
231 | 231 |
| 232 static int GetContextOffset(int context_index) { |
| 233 return kFirstContextOffset + context_index * kPointerSize; |
| 234 } |
| 235 |
232 private: | 236 private: |
233 static const int kUsedSlot = 0; | 237 static const int kUsedSlot = 0; |
| 238 static const int kFirstContextOffset = |
| 239 FixedArray::kHeaderSize + (kUsedSlot + 1) * kPointerSize; |
234 | 240 |
235 DISALLOW_IMPLICIT_CONSTRUCTORS(GlobalContextTable); | 241 DISALLOW_IMPLICIT_CONSTRUCTORS(GlobalContextTable); |
236 }; | 242 }; |
237 | 243 |
238 // JSFunctions are pairs (context, function code), sometimes also called | 244 // JSFunctions are pairs (context, function code), sometimes also called |
239 // closures. A Context object is used to represent function contexts and | 245 // closures. A Context object is used to represent function contexts and |
240 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). | 246 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak). |
241 // | 247 // |
242 // At runtime, the contexts build a stack in parallel to the execution | 248 // At runtime, the contexts build a stack in parallel to the execution |
243 // stack, with the top-most context being the current context. All contexts | 249 // stack, with the top-most context being the current context. All contexts |
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605 static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object); | 611 static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object); |
606 #endif | 612 #endif |
607 | 613 |
608 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); | 614 STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize); |
609 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); | 615 STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex); |
610 }; | 616 }; |
611 | 617 |
612 } } // namespace v8::internal | 618 } } // namespace v8::internal |
613 | 619 |
614 #endif // V8_CONTEXTS_H_ | 620 #endif // V8_CONTEXTS_H_ |
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