Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp @ 20273:9441d22e429a
8047820: G1 Block offset table does not need to support generic Space classes
Reviewed-by: tschatzl, stefank
author | mgerdin |
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date | Wed, 25 Jun 2014 16:53:13 +0200 |
parents | 78bbf4d43a14 |
children | 1526a938e670 |
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/heapRegion.hpp" |
1972 | 30 #include "memory/space.hpp" |
31 | |
342 | 32 inline HeapWord* G1BlockOffsetTable::block_start(const void* addr) { |
33 if (addr >= _bottom && addr < _end) { | |
34 return block_start_unsafe(addr); | |
35 } else { | |
36 return NULL; | |
37 } | |
38 } | |
39 | |
40 inline HeapWord* | |
41 G1BlockOffsetTable::block_start_const(const void* addr) const { | |
42 if (addr >= _bottom && addr < _end) { | |
43 return block_start_unsafe_const(addr); | |
44 } else { | |
45 return NULL; | |
46 } | |
47 } | |
48 | |
49 inline size_t G1BlockOffsetSharedArray::index_for(const void* p) const { | |
50 char* pc = (char*)p; | |
51 assert(pc >= (char*)_reserved.start() && | |
52 pc < (char*)_reserved.end(), | |
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53 err_msg("p (" PTR_FORMAT ") not in reserved [" PTR_FORMAT ", " PTR_FORMAT ")", |
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54 p2i(p), p2i(_reserved.start()), p2i(_reserved.end()))); |
342 | 55 size_t delta = pointer_delta(pc, _reserved.start(), sizeof(char)); |
56 size_t result = delta >> LogN; | |
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57 check_index(result, "bad index from address"); |
342 | 58 return result; |
59 } | |
60 | |
61 inline HeapWord* | |
62 G1BlockOffsetSharedArray::address_for_index(size_t index) const { | |
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63 check_index(index, "index out of range"); |
342 | 64 HeapWord* result = _reserved.start() + (index << LogN_words); |
65 assert(result >= _reserved.start() && result < _reserved.end(), | |
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66 err_msg("bad address from index result " PTR_FORMAT |
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67 " _reserved.start() " PTR_FORMAT " _reserved.end() " |
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68 PTR_FORMAT, |
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69 p2i(result), p2i(_reserved.start()), p2i(_reserved.end()))); |
342 | 70 return result; |
71 } | |
72 | |
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73 inline size_t |
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74 G1BlockOffsetArray::block_size(const HeapWord* p) const { |
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75 return gsp()->block_size(p); |
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76 } |
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77 |
342 | 78 inline HeapWord* |
79 G1BlockOffsetArray::block_at_or_preceding(const void* addr, | |
80 bool has_max_index, | |
81 size_t max_index) const { | |
82 assert(_array->offset_array(0) == 0, "objects can't cross covered areas"); | |
83 size_t index = _array->index_for(addr); | |
84 // We must make sure that the offset table entry we use is valid. If | |
85 // "addr" is past the end, start at the last known one and go forward. | |
86 if (has_max_index) { | |
87 index = MIN2(index, max_index); | |
88 } | |
89 HeapWord* q = _array->address_for_index(index); | |
90 | |
91 uint offset = _array->offset_array(index); // Extend u_char to uint. | |
92 while (offset >= N_words) { | |
93 // The excess of the offset from N_words indicates a power of Base | |
94 // to go back by. | |
95 size_t n_cards_back = BlockOffsetArray::entry_to_cards_back(offset); | |
96 q -= (N_words * n_cards_back); | |
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97 assert(q >= gsp()->bottom(), "Went below bottom!"); |
342 | 98 index -= n_cards_back; |
99 offset = _array->offset_array(index); | |
100 } | |
101 assert(offset < N_words, "offset too large"); | |
102 q -= offset; | |
103 return q; | |
104 } | |
105 | |
106 inline HeapWord* | |
107 G1BlockOffsetArray:: | |
108 forward_to_block_containing_addr_const(HeapWord* q, HeapWord* n, | |
109 const void* addr) const { | |
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110 if (addr >= gsp()->top()) return gsp()->top(); |
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111 while (n <= addr) { |
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112 q = n; |
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113 oop obj = oop(q); |
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114 if (obj->klass_or_null() == NULL) return q; |
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115 n += obj->size(); |
342 | 116 } |
117 assert(q <= n, "wrong order for q and addr"); | |
118 assert(addr < n, "wrong order for addr and n"); | |
119 return q; | |
120 } | |
121 | |
122 inline HeapWord* | |
123 G1BlockOffsetArray::forward_to_block_containing_addr(HeapWord* q, | |
124 const void* addr) { | |
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125 if (oop(q)->klass_or_null() == NULL) return q; |
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126 HeapWord* n = q + block_size(q); |
342 | 127 // In the normal case, where the query "addr" is a card boundary, and the |
128 // offset table chunks are the same size as cards, the block starting at | |
129 // "q" will contain addr, so the test below will fail, and we'll fall | |
130 // through quickly. | |
131 if (n <= addr) { | |
132 q = forward_to_block_containing_addr_slow(q, n, addr); | |
133 } | |
134 assert(q <= addr, "wrong order for current and arg"); | |
135 return q; | |
136 } | |
137 | |
138 ////////////////////////////////////////////////////////////////////////// | |
139 // BlockOffsetArrayNonContigSpace inlines | |
140 ////////////////////////////////////////////////////////////////////////// | |
141 inline void G1BlockOffsetArray::freed(HeapWord* blk_start, HeapWord* blk_end) { | |
142 // Verify that the BOT shows [blk_start, blk_end) to be one block. | |
143 verify_single_block(blk_start, blk_end); | |
144 // adjust _unallocated_block upward or downward | |
145 // as appropriate | |
146 if (BlockOffsetArrayUseUnallocatedBlock) { | |
147 assert(_unallocated_block <= _end, | |
148 "Inconsistent value for _unallocated_block"); | |
149 if (blk_end >= _unallocated_block && blk_start <= _unallocated_block) { | |
150 // CMS-specific note: a block abutting _unallocated_block to | |
151 // its left is being freed, a new block is being added or | |
152 // we are resetting following a compaction | |
153 _unallocated_block = blk_start; | |
154 } | |
155 } | |
156 } | |
157 | |
158 inline void G1BlockOffsetArray::freed(HeapWord* blk, size_t size) { | |
159 freed(blk, blk + size); | |
160 } | |
1972 | 161 |
162 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1BLOCKOFFSETTABLE_INLINE_HPP |