Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionSeq.hpp @ 10542:554f67e4ff3f
Use slow-path stub call instead of deopt in lowering of DynamicNewArrayNode.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Wed, 26 Jun 2013 15:35:58 +0200 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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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 | |
342 | 28 class HeapRegion; |
29 class HeapRegionClosure; | |
3766 | 30 class FreeRegionList; |
31 | |
32 // This class keeps track of the region metadata (i.e., HeapRegion | |
33 // instances). They are kept in the _regions array in address | |
34 // order. A region's index in the array corresponds to its index in | |
35 // the heap (i.e., 0 is the region at the bottom of the heap, 1 is | |
36 // the one after it, etc.). Two regions that are consecutive in the | |
37 // array should also be adjacent in the address space (i.e., | |
38 // region(i).end() == region(i+1).bottom(). | |
39 // | |
40 // We create a HeapRegion when we commit the region's address space | |
41 // for the first time. When we uncommit the address space of a | |
42 // region we retain the HeapRegion to be able to re-use it in the | |
43 // future (in case we recommit it). | |
44 // | |
45 // We keep track of three lengths: | |
46 // | |
47 // * _length (returned by length()) is the number of currently | |
48 // committed regions. | |
49 // * _allocated_length (not exposed outside this class) is the | |
50 // number of regions for which we have HeapRegions. | |
51 // * _max_length (returned by max_length()) is the maximum number of | |
52 // regions the heap can have. | |
53 // | |
54 // and maintain that: _length <= _allocated_length <= _max_length | |
342 | 55 |
6197 | 56 class HeapRegionSeq: public CHeapObj<mtGC> { |
3972 | 57 friend class VMStructs; |
342 | 58 |
3766 | 59 // The array that holds the HeapRegions. |
60 HeapRegion** _regions; | |
61 | |
62 // Version of _regions biased to address 0 | |
63 HeapRegion** _regions_biased; | |
64 | |
65 // The number of regions committed in the heap. | |
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66 uint _length; |
342 | 67 |
3766 | 68 // The address of the first reserved word in the heap. |
69 HeapWord* _heap_bottom; | |
70 | |
71 // The address of the last reserved word in the heap - 1. | |
72 HeapWord* _heap_end; | |
73 | |
74 // The log of the region byte size. | |
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75 uint _region_shift; |
3766 | 76 |
77 // A hint for which index to start searching from for humongous | |
78 // allocations. | |
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79 uint _next_search_index; |
342 | 80 |
3766 | 81 // The number of regions for which we have allocated HeapRegions for. |
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82 uint _allocated_length; |
3766 | 83 |
84 // The maximum number of regions in the heap. | |
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85 uint _max_length; |
3766 | 86 |
87 // Find a contiguous set of empty regions of length num, starting | |
88 // from the given index. | |
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89 uint find_contiguous_from(uint from, uint num); |
342 | 90 |
3766 | 91 // Map a heap address to a biased region index. Assume that the |
92 // address is valid. | |
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93 inline uintx addr_to_index_biased(HeapWord* addr) const; |
342 | 94 |
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95 void increment_allocated_length() { |
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96 assert(_allocated_length < _max_length, "pre-condition"); |
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97 _allocated_length++; |
3766 | 98 } |
99 | |
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100 void increment_length() { |
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101 assert(_length < _max_length, "pre-condition"); |
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102 _length++; |
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103 } |
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104 |
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105 void decrement_length() { |
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106 assert(_length > 0, "pre-condition"); |
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107 _length--; |
3766 | 108 } |
342 | 109 |
110 public: | |
3766 | 111 // Empty contructor, we'll initialize it with the initialize() method. |
112 HeapRegionSeq() { } | |
113 | |
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114 void initialize(HeapWord* bottom, HeapWord* end, uint max_length); |
342 | 115 |
3766 | 116 // Return the HeapRegion at the given index. Assume that the index |
117 // is valid. | |
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118 inline HeapRegion* at(uint index) const; |
3766 | 119 |
120 // If addr is within the committed space return its corresponding | |
121 // HeapRegion, otherwise return NULL. | |
122 inline HeapRegion* addr_to_region(HeapWord* addr) const; | |
123 | |
124 // Return the HeapRegion that corresponds to the given | |
125 // address. Assume the address is valid. | |
126 inline HeapRegion* addr_to_region_unsafe(HeapWord* addr) const; | |
342 | 127 |
3766 | 128 // Return the number of regions that have been committed in the heap. |
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129 uint length() const { return _length; } |
3766 | 130 |
131 // Return the maximum number of regions in the heap. | |
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132 uint max_length() const { return _max_length; } |
342 | 133 |
3766 | 134 // Expand the sequence to reflect that the heap has grown from |
135 // old_end to new_end. Either create new HeapRegions, or re-use | |
136 // existing ones, and return them in the given list. Returns the | |
137 // memory region that covers the newly-created regions. If a | |
138 // HeapRegion allocation fails, the result memory region might be | |
139 // smaller than the desired one. | |
140 MemRegion expand_by(HeapWord* old_end, HeapWord* new_end, | |
141 FreeRegionList* list); | |
342 | 142 |
3766 | 143 // Return the number of contiguous regions at the end of the sequence |
342 | 144 // that are available for allocation. |
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145 uint free_suffix(); |
342 | 146 |
2361 | 147 // Find a contiguous set of empty regions of length num and return |
3766 | 148 // the index of the first region or G1_NULL_HRS_INDEX if the |
149 // search was unsuccessful. | |
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150 uint find_contiguous(uint num); |
342 | 151 |
3766 | 152 // Apply blk->doHeapRegion() on all committed regions in address order, |
153 // terminating the iteration early if doHeapRegion() returns true. | |
154 void iterate(HeapRegionClosure* blk) const; | |
342 | 155 |
3766 | 156 // As above, but start the iteration from hr and loop around. If hr |
157 // is NULL, we start from the first region in the heap. | |
158 void iterate_from(HeapRegion* hr, HeapRegionClosure* blk) const; | |
342 | 159 |
3766 | 160 // Tag as uncommitted as many regions that are completely free as |
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161 // possible, up to num_regions_to_remove, from the suffix of the committed |
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162 // sequence. Return the actual number of removed regions. |
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163 uint shrink_by(uint num_regions_to_remove); |
342 | 164 |
3766 | 165 // Do some sanity checking. |
166 void verify_optional() PRODUCT_RETURN; | |
342 | 167 }; |
1972 | 168 |
169 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |