Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp @ 1703:f6f3eef8a521
6581734: CMS Old Gen's collection usage is zero after GC which is incorrect
Summary: Management code enabled for use by a concurrent collector.
Reviewed-by: mchung, ysr
author | kevinw |
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date | Fri, 30 Jul 2010 22:43:50 +0100 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2007, 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 | |
25 inline HeapWord* G1BlockOffsetTable::block_start(const void* addr) { | |
26 if (addr >= _bottom && addr < _end) { | |
27 return block_start_unsafe(addr); | |
28 } else { | |
29 return NULL; | |
30 } | |
31 } | |
32 | |
33 inline HeapWord* | |
34 G1BlockOffsetTable::block_start_const(const void* addr) const { | |
35 if (addr >= _bottom && addr < _end) { | |
36 return block_start_unsafe_const(addr); | |
37 } else { | |
38 return NULL; | |
39 } | |
40 } | |
41 | |
42 inline size_t G1BlockOffsetSharedArray::index_for(const void* p) const { | |
43 char* pc = (char*)p; | |
44 assert(pc >= (char*)_reserved.start() && | |
45 pc < (char*)_reserved.end(), | |
46 "p not in range."); | |
47 size_t delta = pointer_delta(pc, _reserved.start(), sizeof(char)); | |
48 size_t result = delta >> LogN; | |
49 assert(result < _vs.committed_size(), "bad index from address"); | |
50 return result; | |
51 } | |
52 | |
53 inline HeapWord* | |
54 G1BlockOffsetSharedArray::address_for_index(size_t index) const { | |
55 assert(index < _vs.committed_size(), "bad index"); | |
56 HeapWord* result = _reserved.start() + (index << LogN_words); | |
57 assert(result >= _reserved.start() && result < _reserved.end(), | |
58 "bad address from index"); | |
59 return result; | |
60 } | |
61 | |
62 inline HeapWord* | |
63 G1BlockOffsetArray::block_at_or_preceding(const void* addr, | |
64 bool has_max_index, | |
65 size_t max_index) const { | |
66 assert(_array->offset_array(0) == 0, "objects can't cross covered areas"); | |
67 size_t index = _array->index_for(addr); | |
68 // We must make sure that the offset table entry we use is valid. If | |
69 // "addr" is past the end, start at the last known one and go forward. | |
70 if (has_max_index) { | |
71 index = MIN2(index, max_index); | |
72 } | |
73 HeapWord* q = _array->address_for_index(index); | |
74 | |
75 uint offset = _array->offset_array(index); // Extend u_char to uint. | |
76 while (offset >= N_words) { | |
77 // The excess of the offset from N_words indicates a power of Base | |
78 // to go back by. | |
79 size_t n_cards_back = BlockOffsetArray::entry_to_cards_back(offset); | |
80 q -= (N_words * n_cards_back); | |
81 assert(q >= _sp->bottom(), "Went below bottom!"); | |
82 index -= n_cards_back; | |
83 offset = _array->offset_array(index); | |
84 } | |
85 assert(offset < N_words, "offset too large"); | |
86 q -= offset; | |
87 return q; | |
88 } | |
89 | |
90 inline HeapWord* | |
91 G1BlockOffsetArray:: | |
92 forward_to_block_containing_addr_const(HeapWord* q, HeapWord* n, | |
93 const void* addr) const { | |
94 if (csp() != NULL) { | |
95 if (addr >= csp()->top()) return csp()->top(); | |
96 while (n <= addr) { | |
97 q = n; | |
98 oop obj = oop(q); | |
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99 if (obj->klass_or_null() == NULL) return q; |
342 | 100 n += obj->size(); |
101 } | |
102 } else { | |
103 while (n <= addr) { | |
104 q = n; | |
105 oop obj = oop(q); | |
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106 if (obj->klass_or_null() == NULL) return q; |
342 | 107 n += _sp->block_size(q); |
108 } | |
109 } | |
110 assert(q <= n, "wrong order for q and addr"); | |
111 assert(addr < n, "wrong order for addr and n"); | |
112 return q; | |
113 } | |
114 | |
115 inline HeapWord* | |
116 G1BlockOffsetArray::forward_to_block_containing_addr(HeapWord* q, | |
117 const void* addr) { | |
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118 if (oop(q)->klass_or_null() == NULL) return q; |
342 | 119 HeapWord* n = q + _sp->block_size(q); |
120 // In the normal case, where the query "addr" is a card boundary, and the | |
121 // offset table chunks are the same size as cards, the block starting at | |
122 // "q" will contain addr, so the test below will fail, and we'll fall | |
123 // through quickly. | |
124 if (n <= addr) { | |
125 q = forward_to_block_containing_addr_slow(q, n, addr); | |
126 } | |
127 assert(q <= addr, "wrong order for current and arg"); | |
128 return q; | |
129 } | |
130 | |
131 ////////////////////////////////////////////////////////////////////////// | |
132 // BlockOffsetArrayNonContigSpace inlines | |
133 ////////////////////////////////////////////////////////////////////////// | |
134 inline void G1BlockOffsetArray::freed(HeapWord* blk_start, HeapWord* blk_end) { | |
135 // Verify that the BOT shows [blk_start, blk_end) to be one block. | |
136 verify_single_block(blk_start, blk_end); | |
137 // adjust _unallocated_block upward or downward | |
138 // as appropriate | |
139 if (BlockOffsetArrayUseUnallocatedBlock) { | |
140 assert(_unallocated_block <= _end, | |
141 "Inconsistent value for _unallocated_block"); | |
142 if (blk_end >= _unallocated_block && blk_start <= _unallocated_block) { | |
143 // CMS-specific note: a block abutting _unallocated_block to | |
144 // its left is being freed, a new block is being added or | |
145 // we are resetting following a compaction | |
146 _unallocated_block = blk_start; | |
147 } | |
148 } | |
149 } | |
150 | |
151 inline void G1BlockOffsetArray::freed(HeapWord* blk, size_t size) { | |
152 freed(blk, blk + size); | |
153 } |