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annotate src/share/vm/gc_implementation/shared/markSweep.inline.hpp @ 1562:dfe27f03244a
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2008, 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 | |
25 inline void MarkSweep::mark_object(oop obj) { | |
26 // some marks may contain information we need to preserve so we store them away | |
27 // and overwrite the mark. We'll restore it at the end of markSweep. | |
28 markOop mark = obj->mark(); | |
29 obj->set_mark(markOopDesc::prototype()->set_marked()); | |
30 | |
31 if (mark->must_be_preserved(obj)) { | |
32 preserve_mark(obj, mark); | |
33 } | |
34 } | |
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35 |
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36 template <class T> inline void MarkSweep::follow_root(T* p) { |
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37 assert(!Universe::heap()->is_in_reserved(p), |
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38 "roots shouldn't be things within the heap"); |
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39 #ifdef VALIDATE_MARK_SWEEP |
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40 if (ValidateMarkSweep) { |
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41 guarantee(!_root_refs_stack->contains(p), "should only be in here once"); |
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42 _root_refs_stack->push(p); |
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43 } |
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44 #endif |
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45 T heap_oop = oopDesc::load_heap_oop(p); |
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46 if (!oopDesc::is_null(heap_oop)) { |
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47 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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48 if (!obj->mark()->is_marked()) { |
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49 mark_object(obj); |
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50 obj->follow_contents(); |
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51 } |
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52 } |
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53 follow_stack(); |
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54 } |
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55 |
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56 template <class T> inline void MarkSweep::mark_and_follow(T* p) { |
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57 // assert(Universe::heap()->is_in_reserved(p), "should be in object space"); |
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58 T heap_oop = oopDesc::load_heap_oop(p); |
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59 if (!oopDesc::is_null(heap_oop)) { |
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60 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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61 if (!obj->mark()->is_marked()) { |
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62 mark_object(obj); |
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63 obj->follow_contents(); |
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64 } |
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65 } |
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66 } |
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67 |
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68 template <class T> inline void MarkSweep::mark_and_push(T* p) { |
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69 // assert(Universe::heap()->is_in_reserved(p), "should be in object space"); |
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70 T heap_oop = oopDesc::load_heap_oop(p); |
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71 if (!oopDesc::is_null(heap_oop)) { |
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72 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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73 if (!obj->mark()->is_marked()) { |
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74 mark_object(obj); |
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75 _marking_stack->push(obj); |
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76 } |
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77 } |
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78 } |
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79 |
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80 void MarkSweep::push_objarray(oop obj, size_t index) { |
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81 ObjArrayTask task(obj, index); |
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82 assert(task.is_valid(), "bad ObjArrayTask"); |
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83 _objarray_stack->push(task); |
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84 } |
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85 |
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86 template <class T> inline void MarkSweep::adjust_pointer(T* p, bool isroot) { |
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87 T heap_oop = oopDesc::load_heap_oop(p); |
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88 if (!oopDesc::is_null(heap_oop)) { |
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89 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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90 oop new_obj = oop(obj->mark()->decode_pointer()); |
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91 assert(new_obj != NULL || // is forwarding ptr? |
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92 obj->mark() == markOopDesc::prototype() || // not gc marked? |
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93 (UseBiasedLocking && obj->mark()->has_bias_pattern()) || |
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94 // not gc marked? |
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95 obj->is_shared(), // never forwarded? |
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96 "should be forwarded"); |
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97 if (new_obj != NULL) { |
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98 assert(Universe::heap()->is_in_reserved(new_obj), |
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99 "should be in object space"); |
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100 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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101 } |
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102 } |
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103 VALIDATE_MARK_SWEEP_ONLY(track_adjusted_pointer(p, isroot)); |
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104 } |
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105 |
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106 template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) { |
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107 #ifdef VALIDATE_MARK_SWEEP |
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108 if (ValidateMarkSweep) { |
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109 if (!Universe::heap()->is_in_reserved(p)) { |
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110 _root_refs_stack->push(p); |
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111 } else { |
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112 _other_refs_stack->push(p); |
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113 } |
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114 } |
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115 #endif |
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116 mark_and_push(p); |
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117 } |