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annotate src/share/vm/gc_implementation/shared/markSweep.inline.hpp @ 18041:52b4284cb496

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Merge with jdk8u20-b26
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 15 Oct 2014 16:02:50 +0200
parents 89152779163c 595c0f60d50d
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1 /*
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2 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP
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27
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28 #include "gc_implementation/shared/markSweep.hpp"
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29 #include "gc_interface/collectedHeap.hpp"
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30 #include "utilities/stack.inline.hpp"
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31 #include "utilities/macros.hpp"
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32 #if INCLUDE_ALL_GCS
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33 #include "gc_implementation/g1/g1StringDedup.hpp"
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34 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
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35 #endif // INCLUDE_ALL_GCS
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36
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37 inline void MarkSweep::mark_object(oop obj) {
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38 #if INCLUDE_ALL_GCS
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39 if (G1StringDedup::is_enabled()) {
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40 // We must enqueue the object before it is marked
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41 // as we otherwise can't read the object's age.
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42 G1StringDedup::enqueue_from_mark(obj);
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43 }
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44 #endif
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45 // some marks may contain information we need to preserve so we store them away
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46 // and overwrite the mark. We'll restore it at the end of markSweep.
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47 markOop mark = obj->mark();
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48 obj->set_mark(markOopDesc::prototype()->set_marked());
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49
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50 if (mark->must_be_preserved(obj)) {
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51 preserve_mark(obj, mark);
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52 }
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53 }
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54
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55 inline void MarkSweep::follow_klass(Klass* klass) {
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56 oop op = klass->klass_holder();
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57 MarkSweep::mark_and_push(&op);
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58 }
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59
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60 template <class T> inline void MarkSweep::follow_root(T* p) {
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61 assert(!Universe::heap()->is_in_reserved(p),
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62 "roots shouldn't be things within the heap");
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63 T heap_oop = oopDesc::load_heap_oop(p);
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64 if (!oopDesc::is_null(heap_oop)) {
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65 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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66 if (!obj->mark()->is_marked()) {
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67 mark_object(obj);
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68 obj->follow_contents();
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69 }
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70 }
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71 follow_stack();
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72 }
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73
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74 template <class T> inline void MarkSweep::mark_and_push(T* p) {
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75 // assert(Universe::heap()->is_in_reserved(p), "should be in object space");
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76 T heap_oop = oopDesc::load_heap_oop(p);
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77 if (!oopDesc::is_null(heap_oop)) {
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78 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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79 if (!obj->mark()->is_marked()) {
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80 mark_object(obj);
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81 _marking_stack.push(obj);
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82 }
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83 }
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84 }
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85
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86 void MarkSweep::push_objarray(oop obj, size_t index) {
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87 ObjArrayTask task(obj, index);
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88 assert(task.is_valid(), "bad ObjArrayTask");
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89 _objarray_stack.push(task);
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90 }
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91
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92 template <class T> inline void MarkSweep::adjust_pointer(T* p) {
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93 T heap_oop = oopDesc::load_heap_oop(p);
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94 if (!oopDesc::is_null(heap_oop)) {
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95 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
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96 oop new_obj = oop(obj->mark()->decode_pointer());
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97 assert(new_obj != NULL || // is forwarding ptr?
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98 obj->mark() == markOopDesc::prototype() || // not gc marked?
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99 (UseBiasedLocking && obj->mark()->has_bias_pattern()),
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100 // not gc marked?
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101 "should be forwarded");
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102 if (new_obj != NULL) {
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103 assert(Universe::heap()->is_in_reserved(new_obj),
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104 "should be in object space");
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105 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
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106 }
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107 }
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108 }
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109
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110 template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) {
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111 mark_and_push(p);
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112 }
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114 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_INLINE_HPP