Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp @ 20331:18bf0b66de52
8044406: JVM crash with JDK8 (build 1.8.0-b132) with G1 GC
Summary: Fill the last card that has been allocated into with a dummy object
Reviewed-by: tschatzl, mgerdin
author | poonam |
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date | Tue, 19 Aug 2014 02:05:49 -0700 |
parents | 2c6ef90f030a |
children | 1f1d373cd044 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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_G1BLOCKOFFSETTABLE_INLINE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_INLINE_HPP | |
27 | |
28 #include "gc_implementation/g1/g1BlockOffsetTable.hpp" | |
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29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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30 #include "gc_implementation/g1/heapRegion.inline.hpp" |
1972 | 31 #include "memory/space.hpp" |
32 | |
342 | 33 inline HeapWord* G1BlockOffsetTable::block_start(const void* addr) { |
34 if (addr >= _bottom && addr < _end) { | |
35 return block_start_unsafe(addr); | |
36 } else { | |
37 return NULL; | |
38 } | |
39 } | |
40 | |
41 inline HeapWord* | |
42 G1BlockOffsetTable::block_start_const(const void* addr) const { | |
43 if (addr >= _bottom && addr < _end) { | |
44 return block_start_unsafe_const(addr); | |
45 } else { | |
46 return NULL; | |
47 } | |
48 } | |
49 | |
50 inline size_t G1BlockOffsetSharedArray::index_for(const void* p) const { | |
51 char* pc = (char*)p; | |
52 assert(pc >= (char*)_reserved.start() && | |
53 pc < (char*)_reserved.end(), | |
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54 err_msg("p (" PTR_FORMAT ") not in reserved [" PTR_FORMAT ", " PTR_FORMAT ")", |
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55 p2i(p), p2i(_reserved.start()), p2i(_reserved.end()))); |
342 | 56 size_t delta = pointer_delta(pc, _reserved.start(), sizeof(char)); |
57 size_t result = delta >> LogN; | |
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58 check_index(result, "bad index from address"); |
342 | 59 return result; |
60 } | |
61 | |
62 inline HeapWord* | |
63 G1BlockOffsetSharedArray::address_for_index(size_t index) const { | |
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64 check_index(index, "index out of range"); |
342 | 65 HeapWord* result = _reserved.start() + (index << LogN_words); |
66 assert(result >= _reserved.start() && result < _reserved.end(), | |
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67 err_msg("bad address from index result " PTR_FORMAT |
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68 " _reserved.start() " PTR_FORMAT " _reserved.end() " |
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69 PTR_FORMAT, |
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70 p2i(result), p2i(_reserved.start()), p2i(_reserved.end()))); |
342 | 71 return result; |
72 } | |
73 | |
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74 inline size_t |
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75 G1BlockOffsetArray::block_size(const HeapWord* p) const { |
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76 return gsp()->block_size(p); |
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77 } |
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78 |
342 | 79 inline HeapWord* |
80 G1BlockOffsetArray::block_at_or_preceding(const void* addr, | |
81 bool has_max_index, | |
82 size_t max_index) const { | |
83 assert(_array->offset_array(0) == 0, "objects can't cross covered areas"); | |
84 size_t index = _array->index_for(addr); | |
85 // We must make sure that the offset table entry we use is valid. If | |
86 // "addr" is past the end, start at the last known one and go forward. | |
87 if (has_max_index) { | |
88 index = MIN2(index, max_index); | |
89 } | |
90 HeapWord* q = _array->address_for_index(index); | |
91 | |
92 uint offset = _array->offset_array(index); // Extend u_char to uint. | |
93 while (offset >= N_words) { | |
94 // The excess of the offset from N_words indicates a power of Base | |
95 // to go back by. | |
96 size_t n_cards_back = BlockOffsetArray::entry_to_cards_back(offset); | |
97 q -= (N_words * n_cards_back); | |
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98 assert(q >= gsp()->bottom(), "Went below bottom!"); |
342 | 99 index -= n_cards_back; |
100 offset = _array->offset_array(index); | |
101 } | |
102 assert(offset < N_words, "offset too large"); | |
103 q -= offset; | |
104 return q; | |
105 } | |
106 | |
107 inline HeapWord* | |
108 G1BlockOffsetArray:: | |
109 forward_to_block_containing_addr_const(HeapWord* q, HeapWord* n, | |
110 const void* addr) const { | |
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111 if (addr >= gsp()->top()) return gsp()->top(); |
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112 while (n <= addr) { |
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113 q = n; |
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114 oop obj = oop(q); |
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115 if (obj->klass_or_null() == NULL) return q; |
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116 n += block_size(q); |
342 | 117 } |
118 assert(q <= n, "wrong order for q and addr"); | |
119 assert(addr < n, "wrong order for addr and n"); | |
120 return q; | |
121 } | |
122 | |
123 inline HeapWord* | |
124 G1BlockOffsetArray::forward_to_block_containing_addr(HeapWord* q, | |
125 const void* addr) { | |
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126 if (oop(q)->klass_or_null() == NULL) return q; |
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127 HeapWord* n = q + block_size(q); |
342 | 128 // In the normal case, where the query "addr" is a card boundary, and the |
129 // offset table chunks are the same size as cards, the block starting at | |
130 // "q" will contain addr, so the test below will fail, and we'll fall | |
131 // through quickly. | |
132 if (n <= addr) { | |
133 q = forward_to_block_containing_addr_slow(q, n, addr); | |
134 } | |
135 assert(q <= addr, "wrong order for current and arg"); | |
136 return q; | |
137 } | |
138 | |
139 ////////////////////////////////////////////////////////////////////////// | |
140 // BlockOffsetArrayNonContigSpace inlines | |
141 ////////////////////////////////////////////////////////////////////////// | |
142 inline void G1BlockOffsetArray::freed(HeapWord* blk_start, HeapWord* blk_end) { | |
143 // Verify that the BOT shows [blk_start, blk_end) to be one block. | |
144 verify_single_block(blk_start, blk_end); | |
145 // adjust _unallocated_block upward or downward | |
146 // as appropriate | |
147 if (BlockOffsetArrayUseUnallocatedBlock) { | |
148 assert(_unallocated_block <= _end, | |
149 "Inconsistent value for _unallocated_block"); | |
150 if (blk_end >= _unallocated_block && blk_start <= _unallocated_block) { | |
151 // CMS-specific note: a block abutting _unallocated_block to | |
152 // its left is being freed, a new block is being added or | |
153 // we are resetting following a compaction | |
154 _unallocated_block = blk_start; | |
155 } | |
156 } | |
157 } | |
158 | |
159 inline void G1BlockOffsetArray::freed(HeapWord* blk, size_t size) { | |
160 freed(blk, blk + size); | |
161 } | |
1972 | 162 |
163 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_INLINE_HPP |