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Side by Side Diff: runtime/vm/gc_sweeper.h

Issue 355123002: If a large object is truncated, also truncate the page. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 6 years, 5 months ago
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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 FreeList; 13 class FreeList;
14 class Heap; 14 class Heap;
15 class HeapPage; 15 class HeapPage;
16 16
17 // The class GCSweeper is used to visit the heap after marking to reclaim unused 17 // The class GCSweeper is used to visit the heap after marking to reclaim unused
18 // memory. 18 // memory.
19 class GCSweeper { 19 class GCSweeper {
20 public: 20 public:
21 explicit GCSweeper(Heap* heap) : heap_(heap) {} 21 explicit GCSweeper(Heap* heap) : heap_(heap) {}
22 ~GCSweeper() {} 22 ~GCSweeper() {}
23 23
24 // Sweep the memory area for the page while clearing the mark bits and adding 24 // Sweep the memory area for the page while clearing the mark bits and adding
25 // all the unmarked objects to the freelist. 25 // all the unmarked objects to the freelist.
26 // Returns true if the page is in use. 26 // Returns true if the page is in use.
27 bool SweepPage(HeapPage* page, FreeList* freelist); 27 bool SweepPage(HeapPage* page, FreeList* freelist);
28 28
29 bool SweepLargePage(HeapPage* page); 29 // Returns the number of bytes from page->object_start() to the end of the
Ivan Posva 2014/06/30 05:51:05 Please change this to "number of words" and update
koda 2014/06/30 22:57:48 Done.
30 // last marked object.
31 intptr_t SweepLargePage(HeapPage* page);
30 32
31 private: 33 private:
32 Heap* heap_; 34 Heap* heap_;
33 35
34 DISALLOW_IMPLICIT_CONSTRUCTORS(GCSweeper); 36 DISALLOW_IMPLICIT_CONSTRUCTORS(GCSweeper);
35 }; 37 };
36 38
37 } // namespace dart 39 } // namespace dart
38 40
39 #endif // VM_GC_SWEEPER_H_ 41 #endif // VM_GC_SWEEPER_H_
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