Tue, 23 Nov 2010 13:22:55 -0800
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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23 */
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP
28 #include "gc_implementation/g1/heapRegion.hpp"
29 #include "utilities/growableArray.hpp"
31 class HeapRegion;
32 class HeapRegionClosure;
34 class HeapRegionSeq: public CHeapObj {
36 // _regions is kept sorted by start address order, and no two regions are
37 // overlapping.
38 GrowableArray<HeapRegion*> _regions;
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;
44 // Attempts to allocate a block of the (assumed humongous) word_size,
45 // starting at the region "ind".
46 HeapWord* alloc_obj_from_region_index(int ind, size_t word_size);
48 // Currently, we're choosing collection sets in a round-robin fashion,
49 // starting here.
50 int _next_rr_candidate;
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;
56 public:
57 // Initializes "this" to the empty sequence of regions.
58 HeapRegionSeq(const size_t max_size);
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);
65 // Given a HeapRegion*, returns its index within _regions,
66 // or returns -1 if not found.
67 int find(HeapRegion* hr);
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); }
72 // Return the number of regions in the sequence.
73 size_t length();
75 // Returns the number of contiguous regions at the end of the sequence
76 // that are available for allocation.
77 size_t free_suffix();
79 // Requires "word_size" to be humongous (in the technical sense). If
80 // possible, allocates a contiguous subsequence of the heap regions to
81 // satisfy the allocation, and returns the address of the beginning of
82 // that sequence, otherwise returns NULL.
83 HeapWord* obj_allocate(size_t word_size);
85 // Apply the "doHeapRegion" method of "blk" to all regions in "this",
86 // in address order, terminating the iteration early
87 // if the "doHeapRegion" method returns "true".
88 void iterate(HeapRegionClosure* blk);
90 // Apply the "doHeapRegion" method of "blk" to all regions in "this",
91 // starting at "r" (or first region, if "r" is NULL), in a circular
92 // manner, terminating the iteration early if the "doHeapRegion" method
93 // returns "true".
94 void iterate_from(HeapRegion* r, HeapRegionClosure* blk);
96 // As above, but start from a given index in the sequence
97 // instead of a given heap region.
98 void iterate_from(int idx, HeapRegionClosure* blk);
100 // Requires "shrink_bytes" to be a multiple of the page size and heap
101 // region granularity. Deletes as many "rightmost" completely free heap
102 // regions from the sequence as comprise shrink_bytes bytes. Returns the
103 // MemRegion indicating the region those regions comprised, and sets
104 // "num_regions_deleted" to the number of regions deleted.
105 MemRegion shrink_by(size_t shrink_bytes, size_t& num_regions_deleted);
107 // If "addr" falls within a region in the sequence, return that region,
108 // or else NULL.
109 HeapRegion* addr_to_region(const void* addr);
111 void print();
113 // Prints out runs of empty regions.
114 void print_empty_runs();
116 };
118 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP