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annotate src/share/vm/gc_implementation/g1/heapRegionSeq.hpp @ 2181:d25d4ca69222
Merge.
author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
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date | Wed, 16 Feb 2011 13:47:20 +0100 |
parents | 0fa27f37d4d4 |
children | 1216415d8e35 |
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342 | 1 /* |
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4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
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13 * accompanied this code). | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP | |
27 | |
28 #include "gc_implementation/g1/heapRegion.hpp" | |
29 #include "utilities/growableArray.hpp" | |
30 | |
342 | 31 class HeapRegion; |
32 class HeapRegionClosure; | |
33 | |
34 class HeapRegionSeq: public CHeapObj { | |
35 | |
36 // _regions is kept sorted by start address order, and no two regions are | |
37 // overlapping. | |
38 GrowableArray<HeapRegion*> _regions; | |
39 | |
40 // The index in "_regions" at which to start the next allocation search. | |
41 // (For efficiency only; private to obj_allocate after initialization.) | |
42 int _alloc_search_start; | |
43 | |
2152 | 44 // Finds a contiguous set of empty regions of length num, starting |
45 // from a given index. | |
46 int find_contiguous_from(int from, size_t num); | |
342 | 47 |
48 // Currently, we're choosing collection sets in a round-robin fashion, | |
49 // starting here. | |
50 int _next_rr_candidate; | |
51 | |
52 // The bottom address of the bottom-most region, or else NULL if there | |
53 // are no regions in the sequence. | |
54 char* _seq_bottom; | |
55 | |
56 public: | |
57 // Initializes "this" to the empty sequence of regions. | |
393 | 58 HeapRegionSeq(const size_t max_size); |
342 | 59 |
60 // Adds "hr" to "this" sequence. Requires "hr" not to overlap with | |
61 // any region already in "this". (Will perform better if regions are | |
62 // inserted in ascending address order.) | |
63 void insert(HeapRegion* hr); | |
64 | |
65 // Given a HeapRegion*, returns its index within _regions, | |
66 // or returns -1 if not found. | |
67 int find(HeapRegion* hr); | |
68 | |
69 // Requires the index to be valid, and return the region at the index. | |
70 HeapRegion* at(size_t i) { return _regions.at((int)i); } | |
71 | |
72 // Return the number of regions in the sequence. | |
73 size_t length(); | |
74 | |
75 // Returns the number of contiguous regions at the end of the sequence | |
76 // that are available for allocation. | |
77 size_t free_suffix(); | |
78 | |
2152 | 79 // Finds a contiguous set of empty regions of length num. |
80 int find_contiguous(size_t num); | |
342 | 81 |
82 // Apply the "doHeapRegion" method of "blk" to all regions in "this", | |
83 // in address order, terminating the iteration early | |
84 // if the "doHeapRegion" method returns "true". | |
85 void iterate(HeapRegionClosure* blk); | |
86 | |
87 // Apply the "doHeapRegion" method of "blk" to all regions in "this", | |
88 // starting at "r" (or first region, if "r" is NULL), in a circular | |
89 // manner, terminating the iteration early if the "doHeapRegion" method | |
90 // returns "true". | |
91 void iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
92 | |
93 // As above, but start from a given index in the sequence | |
94 // instead of a given heap region. | |
95 void iterate_from(int idx, HeapRegionClosure* blk); | |
96 | |
97 // Requires "shrink_bytes" to be a multiple of the page size and heap | |
98 // region granularity. Deletes as many "rightmost" completely free heap | |
99 // regions from the sequence as comprise shrink_bytes bytes. Returns the | |
100 // MemRegion indicating the region those regions comprised, and sets | |
101 // "num_regions_deleted" to the number of regions deleted. | |
102 MemRegion shrink_by(size_t shrink_bytes, size_t& num_regions_deleted); | |
103 | |
104 // If "addr" falls within a region in the sequence, return that region, | |
105 // or else NULL. | |
2149 | 106 inline HeapRegion* addr_to_region(const void* addr); |
342 | 107 |
108 void print(); | |
109 | |
677 | 110 // Prints out runs of empty regions. |
111 void print_empty_runs(); | |
342 | 112 |
113 }; | |
1972 | 114 |
115 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |