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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef VM_GC_SWEEPER_H_ | 5 #ifndef VM_GC_SWEEPER_H_ |
6 #define VM_GC_SWEEPER_H_ | 6 #define VM_GC_SWEEPER_H_ |
7 | 7 |
8 #include "vm/globals.h" | 8 #include "vm/globals.h" |
9 | 9 |
10 namespace dart { | 10 namespace dart { |
11 | 11 |
12 // Forward declarations. | 12 // Forward declarations. |
13 class ClassTable; | |
14 class FreeList; | 13 class FreeList; |
15 class Heap; | 14 class Heap; |
16 class HeapPage; | 15 class HeapPage; |
17 class Isolate; | 16 class Isolate; |
18 class PageSpace; | 17 class PageSpace; |
19 | 18 |
20 // The class GCSweeper is used to visit the heap after marking to reclaim unused | 19 // The class GCSweeper is used to visit the heap after marking to reclaim unused |
21 // memory. | 20 // memory. |
22 class GCSweeper { | 21 class GCSweeper { |
23 public: | 22 public: |
24 explicit GCSweeper(const ClassTable* class_table) | 23 GCSweeper() {} |
25 : class_table_(class_table) {} | |
26 ~GCSweeper() {} | 24 ~GCSweeper() {} |
27 | 25 |
28 // Sweep the memory area for the page while clearing the mark bits and adding | 26 // Sweep the memory area for the page while clearing the mark bits and adding |
29 // all the unmarked objects to the freelist. Whether the freelist is | 27 // all the unmarked objects to the freelist. Whether the freelist is |
30 // pre-locked is indicated by the locked parameter. | 28 // pre-locked is indicated by the locked parameter. |
31 // Returns true if the page is in use. Freelist is untouched if page is not | 29 // Returns true if the page is in use. Freelist is untouched if page is not |
32 // in use. | 30 // in use. |
33 bool SweepPage(HeapPage* page, FreeList* freelist, bool locked); | 31 bool SweepPage(HeapPage* page, FreeList* freelist, bool locked); |
34 | 32 |
35 // Returns the number of words from page->object_start() to the end of the | 33 // Returns the number of words from page->object_start() to the end of the |
36 // last marked object. | 34 // last marked object. |
37 intptr_t SweepLargePage(HeapPage* page); | 35 intptr_t SweepLargePage(HeapPage* page); |
38 | 36 |
39 // Sweep the regular sized data pages between first and last inclusive. | 37 // Sweep the regular sized data pages between first and last inclusive. |
40 static void SweepConcurrent(Isolate* isolate, | 38 static void SweepConcurrent(Isolate* isolate, |
41 HeapPage* first, | 39 HeapPage* first, |
42 HeapPage* last, | 40 HeapPage* last, |
43 FreeList* freelist); | 41 FreeList* freelist); |
44 | |
45 private: | |
46 const ClassTable* class_table_; | |
47 }; | 42 }; |
48 | 43 |
49 } // namespace dart | 44 } // namespace dart |
50 | 45 |
51 #endif // VM_GC_SWEEPER_H_ | 46 #endif // VM_GC_SWEEPER_H_ |
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