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Side by Side Diff: src/heap/spaces.h

Issue 1030353003: Enable constant pool support. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 5 years, 9 months ago
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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 // 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_HEAP_SPACES_H_ 5 #ifndef V8_HEAP_SPACES_H_
6 #define V8_HEAP_SPACES_H_ 6 #define V8_HEAP_SPACES_H_
7 7
8 #include "src/allocation.h" 8 #include "src/allocation.h"
9 #include "src/base/atomicops.h" 9 #include "src/base/atomicops.h"
10 #include "src/base/bits.h" 10 #include "src/base/bits.h"
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27 // scavenger implements Cheney's copying algorithm. The old generation is 27 // scavenger implements Cheney's copying algorithm. The old generation is
28 // separated into a map space and an old object space. The map space contains 28 // separated into a map space and an old object space. The map space contains
29 // all (and only) map objects, the rest of old objects go into the old space. 29 // all (and only) map objects, the rest of old objects go into the old space.
30 // The old generation is collected by a mark-sweep-compact collector. 30 // The old generation is collected by a mark-sweep-compact collector.
31 // 31 //
32 // The semispaces of the young generation are contiguous. The old and map 32 // The semispaces of the young generation are contiguous. The old and map
33 // spaces consists of a list of pages. A page has a page header and an object 33 // spaces consists of a list of pages. A page has a page header and an object
34 // area. 34 // area.
35 // 35 //
36 // There is a separate large object space for objects larger than 36 // There is a separate large object space for objects larger than
37 // Page::kMaxHeapObjectSize, so that they do not have to move during 37 // Page::kMaxRegularHeapObjectSize, so that they do not have to move during
38 // collection. The large object space is paged. Pages in large object space 38 // collection. The large object space is paged. Pages in large object space
39 // may be larger than the page size. 39 // may be larger than the page size.
40 // 40 //
41 // A store-buffer based write barrier is used to keep track of intergenerational 41 // A store-buffer based write barrier is used to keep track of intergenerational
42 // references. See heap/store-buffer.h. 42 // references. See heap/store-buffer.h.
43 // 43 //
44 // During scavenges and mark-sweep collections we sometimes (after a store 44 // During scavenges and mark-sweep collections we sometimes (after a store
45 // buffer overflow) iterate intergenerational pointers without decoding heap 45 // buffer overflow) iterate intergenerational pointers without decoding heap
46 // object maps so if the page belongs to old pointer space or large object 46 // object maps so if the page belongs to old pointer space or large object
47 // space it is essential to guarantee that the page does not contain any 47 // space it is essential to guarantee that the page does not contain any
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2685 2685
2686 protected: 2686 protected:
2687 virtual void VerifyObject(HeapObject* obj); 2687 virtual void VerifyObject(HeapObject* obj);
2688 2688
2689 public: 2689 public:
2690 TRACK_MEMORY("CellSpace") 2690 TRACK_MEMORY("CellSpace")
2691 }; 2691 };
2692 2692
2693 2693
2694 // ----------------------------------------------------------------------------- 2694 // -----------------------------------------------------------------------------
2695 // Large objects ( > Page::kMaxHeapObjectSize ) are allocated and managed by 2695 // Large objects ( > Page::kMaxRegularHeapObjectSize ) are allocated and
2696 // the large object space. A large object is allocated from OS heap with 2696 // managed by the large object space. A large object is allocated from OS
2697 // extra padding bytes (Page::kPageSize + Page::kObjectStartOffset). 2697 // heap with extra padding bytes (Page::kPageSize + Page::kObjectStartOffset).
2698 // A large object always starts at Page::kObjectStartOffset to a page. 2698 // A large object always starts at Page::kObjectStartOffset to a page.
2699 // Large objects do not move during garbage collections. 2699 // Large objects do not move during garbage collections.
2700 2700
2701 class LargeObjectSpace : public Space { 2701 class LargeObjectSpace : public Space {
2702 public: 2702 public:
2703 LargeObjectSpace(Heap* heap, intptr_t max_capacity, AllocationSpace id); 2703 LargeObjectSpace(Heap* heap, intptr_t max_capacity, AllocationSpace id);
2704 virtual ~LargeObjectSpace() {} 2704 virtual ~LargeObjectSpace() {}
2705 2705
2706 // Initializes internal data structures. 2706 // Initializes internal data structures.
2707 bool SetUp(); 2707 bool SetUp();
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2870 count = 0; 2870 count = 0;
2871 } 2871 }
2872 // Must be small, since an iteration is used for lookup. 2872 // Must be small, since an iteration is used for lookup.
2873 static const int kMaxComments = 64; 2873 static const int kMaxComments = 64;
2874 }; 2874 };
2875 #endif 2875 #endif
2876 } 2876 }
2877 } // namespace v8::internal 2877 } // namespace v8::internal
2878 2878
2879 #endif // V8_HEAP_SPACES_H_ 2879 #endif // V8_HEAP_SPACES_H_
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