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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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| 2435 | 2435 |
| 2436 // ----------------------------------------------------------------------------- | 2436 // ----------------------------------------------------------------------------- |
| 2437 // Large objects ( > Page::kMaxHeapObjectSize ) are allocated and managed by | 2437 // Large objects ( > Page::kMaxHeapObjectSize ) are allocated and managed by |
| 2438 // the large object space. A large object is allocated from OS heap with | 2438 // the large object space. A large object is allocated from OS heap with |
| 2439 // extra padding bytes (Page::kPageSize + Page::kObjectStartOffset). | 2439 // extra padding bytes (Page::kPageSize + Page::kObjectStartOffset). |
| 2440 // A large object always starts at Page::kObjectStartOffset to a page. | 2440 // A large object always starts at Page::kObjectStartOffset to a page. |
| 2441 // Large objects do not move during garbage collections. | 2441 // Large objects do not move during garbage collections. |
| 2442 | 2442 |
| 2443 class LargeObjectSpace : public Space { | 2443 class LargeObjectSpace : public Space { |
| 2444 public: | 2444 public: |
| 2445 LargeObjectSpace(Heap* heap, AllocationSpace id); | 2445 LargeObjectSpace(Heap* heap, intptr_t max_capacity, AllocationSpace id); |
| 2446 virtual ~LargeObjectSpace() {} | 2446 virtual ~LargeObjectSpace() {} |
| 2447 | 2447 |
| 2448 // Initializes internal data structures. | 2448 // Initializes internal data structures. |
| 2449 bool Setup(); | 2449 bool Setup(); |
| 2450 | 2450 |
| 2451 // Releases internal resources, frees objects in this space. | 2451 // Releases internal resources, frees objects in this space. |
| 2452 void TearDown(); | 2452 void TearDown(); |
| 2453 | 2453 |
| 2454 static intptr_t ObjectSizeFor(intptr_t chunk_size) { | 2454 static intptr_t ObjectSizeFor(intptr_t chunk_size) { |
| 2455 if (chunk_size <= (Page::kPageSize + Page::kObjectStartOffset)) return 0; | 2455 if (chunk_size <= (Page::kPageSize + Page::kObjectStartOffset)) return 0; |
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| 2505 virtual void Verify(); | 2505 virtual void Verify(); |
| 2506 virtual void Print(); | 2506 virtual void Print(); |
| 2507 void ReportStatistics(); | 2507 void ReportStatistics(); |
| 2508 void CollectCodeStatistics(); | 2508 void CollectCodeStatistics(); |
| 2509 #endif | 2509 #endif |
| 2510 // Checks whether an address is in the object area in this space. It | 2510 // Checks whether an address is in the object area in this space. It |
| 2511 // iterates all objects in the space. May be slow. | 2511 // iterates all objects in the space. May be slow. |
| 2512 bool SlowContains(Address addr) { return !FindObject(addr)->IsFailure(); } | 2512 bool SlowContains(Address addr) { return !FindObject(addr)->IsFailure(); } |
| 2513 | 2513 |
| 2514 private: | 2514 private: |
| 2515 intptr_t max_capacity_; |
| 2515 // The head of the linked list of large object chunks. | 2516 // The head of the linked list of large object chunks. |
| 2516 LargePage* first_page_; | 2517 LargePage* first_page_; |
| 2517 intptr_t size_; // allocated bytes | 2518 intptr_t size_; // allocated bytes |
| 2518 int page_count_; // number of chunks | 2519 int page_count_; // number of chunks |
| 2519 intptr_t objects_size_; // size of objects | 2520 intptr_t objects_size_; // size of objects |
| 2520 | 2521 |
| 2521 friend class LargeObjectIterator; | 2522 friend class LargeObjectIterator; |
| 2522 | 2523 |
| 2523 public: | 2524 public: |
| 2524 TRACK_MEMORY("LargeObjectSpace") | 2525 TRACK_MEMORY("LargeObjectSpace") |
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| 2614 } | 2615 } |
| 2615 // Must be small, since an iteration is used for lookup. | 2616 // Must be small, since an iteration is used for lookup. |
| 2616 static const int kMaxComments = 64; | 2617 static const int kMaxComments = 64; |
| 2617 }; | 2618 }; |
| 2618 #endif | 2619 #endif |
| 2619 | 2620 |
| 2620 | 2621 |
| 2621 } } // namespace v8::internal | 2622 } } // namespace v8::internal |
| 2622 | 2623 |
| 2623 #endif // V8_SPACES_H_ | 2624 #endif // V8_SPACES_H_ |
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