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annotate src/share/vm/memory/genOopClosures.inline.hpp @ 14517:3812c088b945
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP |
26 #define SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP | |
27 | |
28 #include "memory/cardTableRS.hpp" | |
29 #include "memory/defNewGeneration.hpp" | |
30 #include "memory/genCollectedHeap.hpp" | |
31 #include "memory/genOopClosures.hpp" | |
32 #include "memory/genRemSet.hpp" | |
33 #include "memory/generation.hpp" | |
34 #include "memory/sharedHeap.hpp" | |
35 #include "memory/space.hpp" | |
36 | |
0 | 37 inline OopsInGenClosure::OopsInGenClosure(Generation* gen) : |
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38 ExtendedOopClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) { |
0 | 39 set_generation(gen); |
40 } | |
41 | |
42 inline void OopsInGenClosure::set_generation(Generation* gen) { | |
43 _gen = gen; | |
44 _gen_boundary = _gen->reserved().start(); | |
45 // Barrier set for the heap, must be set after heap is initialized | |
46 if (_rs == NULL) { | |
47 GenRemSet* rs = SharedHeap::heap()->rem_set(); | |
48 _rs = (CardTableRS*)rs; | |
49 } | |
50 } | |
51 | |
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52 template <class T> inline void OopsInGenClosure::do_barrier(T* p) { |
0 | 53 assert(generation()->is_in_reserved(p), "expected ref in generation"); |
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54 T heap_oop = oopDesc::load_heap_oop(p); |
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55 assert(!oopDesc::is_null(heap_oop), "expected non-null oop"); |
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56 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
0 | 57 // If p points to a younger generation, mark the card. |
58 if ((HeapWord*)obj < _gen_boundary) { | |
59 _rs->inline_write_ref_field_gc(p, obj); | |
60 } | |
61 } | |
62 | |
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63 template <class T> inline void OopsInGenClosure::par_do_barrier(T* p) { |
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64 assert(generation()->is_in_reserved(p), "expected ref in generation"); |
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65 T heap_oop = oopDesc::load_heap_oop(p); |
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66 assert(!oopDesc::is_null(heap_oop), "expected non-null oop"); |
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67 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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68 // If p points to a younger generation, mark the card. |
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69 if ((HeapWord*)obj < gen_boundary()) { |
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70 rs()->write_ref_field_gc_par(p, obj); |
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71 } |
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72 } |
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73 |
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74 inline void OopsInKlassOrGenClosure::do_klass_barrier() { |
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75 assert(_scanned_klass != NULL, "Must be"); |
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76 _scanned_klass->record_modified_oops(); |
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77 } |
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78 |
0 | 79 // NOTE! Any changes made here should also be made |
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80 // in FastScanClosure::do_oop_work() |
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81 template <class T> inline void ScanClosure::do_oop_work(T* p) { |
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82 T heap_oop = oopDesc::load_heap_oop(p); |
0 | 83 // Should we copy the obj? |
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84 if (!oopDesc::is_null(heap_oop)) { |
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85 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
0 | 86 if ((HeapWord*)obj < _boundary) { |
87 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); | |
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88 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
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89 : _g->copy_to_survivor_space(obj); |
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90 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
0 | 91 } |
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92 |
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93 if (is_scanning_a_klass()) { |
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94 do_klass_barrier(); |
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95 } else if (_gc_barrier) { |
0 | 96 // Now call parent closure |
97 do_barrier(p); | |
98 } | |
99 } | |
100 } | |
101 | |
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102 inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); } |
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103 inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); } |
0 | 104 |
105 // NOTE! Any changes made here should also be made | |
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106 // in ScanClosure::do_oop_work() |
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107 template <class T> inline void FastScanClosure::do_oop_work(T* p) { |
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108 T heap_oop = oopDesc::load_heap_oop(p); |
0 | 109 // Should we copy the obj? |
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110 if (!oopDesc::is_null(heap_oop)) { |
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111 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
0 | 112 if ((HeapWord*)obj < _boundary) { |
113 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?"); | |
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114 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
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115 : _g->copy_to_survivor_space(obj); |
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116 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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117 if (is_scanning_a_klass()) { |
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118 do_klass_barrier(); |
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119 } else if (_gc_barrier) { |
0 | 120 // Now call parent closure |
121 do_barrier(p); | |
122 } | |
123 } | |
124 } | |
125 } | |
126 | |
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127 inline void FastScanClosure::do_oop_nv(oop* p) { FastScanClosure::do_oop_work(p); } |
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128 inline void FastScanClosure::do_oop_nv(narrowOop* p) { FastScanClosure::do_oop_work(p); } |
0 | 129 |
130 // Note similarity to ScanClosure; the difference is that | |
131 // the barrier set is taken care of outside this closure. | |
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132 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) { |
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133 assert(!oopDesc::is_null(*p), "null weak reference?"); |
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134 oop obj = oopDesc::load_decode_heap_oop_not_null(p); |
0 | 135 // weak references are sometimes scanned twice; must check |
136 // that to-space doesn't already contain this object | |
137 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) { | |
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138 oop new_obj = obj->is_forwarded() ? obj->forwardee() |
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139 : _g->copy_to_survivor_space(obj); |
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140 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
0 | 141 } |
142 } | |
143 | |
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144 inline void ScanWeakRefClosure::do_oop_nv(oop* p) { ScanWeakRefClosure::do_oop_work(p); } |
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145 inline void ScanWeakRefClosure::do_oop_nv(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); } |
1972 | 146 |
147 #endif // SHARE_VM_MEMORY_GENOOPCLOSURES_INLINE_HPP |