Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/markSweep.cpp @ 17764:595c0f60d50d
8029075: String deduplication in G1
Summary: Implementation of JEP 192, http://openjdk.java.net/jeps/192
Reviewed-by: brutisso, tschatzl, coleenp
author | pliden |
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date | Tue, 18 Mar 2014 19:07:22 +0100 |
parents | 55a0da3d420b |
children | d166675568f6 78bbf4d43a14 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 #include "precompiled.hpp" |
26 #include "compiler/compileBroker.hpp" | |
10405 | 27 #include "gc_implementation/shared/gcTimer.hpp" |
28 #include "gc_implementation/shared/gcTrace.hpp" | |
1972 | 29 #include "gc_implementation/shared/markSweep.inline.hpp" |
30 #include "gc_interface/collectedHeap.inline.hpp" | |
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31 #include "oops/methodData.hpp" |
1972 | 32 #include "oops/objArrayKlass.inline.hpp" |
33 #include "oops/oop.inline.hpp" | |
0 | 34 |
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35 uint MarkSweep::_total_invocations = 0; |
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36 |
6197 | 37 Stack<oop, mtGC> MarkSweep::_marking_stack; |
38 Stack<ObjArrayTask, mtGC> MarkSweep::_objarray_stack; | |
0 | 39 |
6197 | 40 Stack<oop, mtGC> MarkSweep::_preserved_oop_stack; |
41 Stack<markOop, mtGC> MarkSweep::_preserved_mark_stack; | |
0 | 42 size_t MarkSweep::_preserved_count = 0; |
43 size_t MarkSweep::_preserved_count_max = 0; | |
44 PreservedMark* MarkSweep::_preserved_marks = NULL; | |
45 ReferenceProcessor* MarkSweep::_ref_processor = NULL; | |
10405 | 46 STWGCTimer* MarkSweep::_gc_timer = NULL; |
47 SerialOldTracer* MarkSweep::_gc_tracer = NULL; | |
0 | 48 |
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49 MarkSweep::FollowRootClosure MarkSweep::follow_root_closure; |
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50 CodeBlobToOopClosure MarkSweep::follow_code_root_closure(&MarkSweep::follow_root_closure, /*do_marking=*/ true); |
0 | 51 |
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52 void MarkSweep::FollowRootClosure::do_oop(oop* p) { follow_root(p); } |
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53 void MarkSweep::FollowRootClosure::do_oop(narrowOop* p) { follow_root(p); } |
0 | 54 |
55 MarkSweep::MarkAndPushClosure MarkSweep::mark_and_push_closure; | |
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56 MarkSweep::FollowKlassClosure MarkSweep::follow_klass_closure; |
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57 MarkSweep::AdjustKlassClosure MarkSweep::adjust_klass_closure; |
0 | 58 |
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59 void MarkSweep::MarkAndPushClosure::do_oop(oop* p) { mark_and_push(p); } |
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60 void MarkSweep::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(p); } |
0 | 61 |
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62 void MarkSweep::FollowKlassClosure::do_klass(Klass* klass) { |
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63 klass->oops_do(&MarkSweep::mark_and_push_closure); |
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64 } |
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65 void MarkSweep::AdjustKlassClosure::do_klass(Klass* klass) { |
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66 klass->oops_do(&MarkSweep::adjust_pointer_closure); |
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67 } |
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68 |
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69 void MarkSweep::follow_class_loader(ClassLoaderData* cld) { |
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70 cld->oops_do(&MarkSweep::mark_and_push_closure, &MarkSweep::follow_klass_closure, true); |
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71 } |
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72 |
0 | 73 void MarkSweep::follow_stack() { |
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74 do { |
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75 while (!_marking_stack.is_empty()) { |
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76 oop obj = _marking_stack.pop(); |
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77 assert (obj->is_gc_marked(), "p must be marked"); |
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78 obj->follow_contents(); |
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79 } |
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80 // Process ObjArrays one at a time to avoid marking stack bloat. |
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81 if (!_objarray_stack.is_empty()) { |
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82 ObjArrayTask task = _objarray_stack.pop(); |
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83 ObjArrayKlass* k = (ObjArrayKlass*)task.obj()->klass(); |
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84 k->oop_follow_contents(task.obj(), task.index()); |
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85 } |
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86 } while (!_marking_stack.is_empty() || !_objarray_stack.is_empty()); |
0 | 87 } |
88 | |
89 MarkSweep::FollowStackClosure MarkSweep::follow_stack_closure; | |
90 | |
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91 void MarkSweep::FollowStackClosure::do_void() { follow_stack(); } |
0 | 92 |
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93 // We preserve the mark which should be replaced at the end and the location |
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94 // that it will go. Note that the object that this markOop belongs to isn't |
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95 // currently at that address but it will be after phase4 |
0 | 96 void MarkSweep::preserve_mark(oop obj, markOop mark) { |
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97 // We try to store preserved marks in the to space of the new generation since |
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98 // this is storage which should be available. Most of the time this should be |
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99 // sufficient space for the marks we need to preserve but if it isn't we fall |
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100 // back to using Stacks to keep track of the overflow. |
0 | 101 if (_preserved_count < _preserved_count_max) { |
102 _preserved_marks[_preserved_count++].init(obj, mark); | |
103 } else { | |
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104 _preserved_mark_stack.push(mark); |
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105 _preserved_oop_stack.push(obj); |
0 | 106 } |
107 } | |
108 | |
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109 MarkSweep::AdjustPointerClosure MarkSweep::adjust_pointer_closure; |
0 | 110 |
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111 void MarkSweep::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p); } |
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112 void MarkSweep::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p); } |
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113 |
0 | 114 void MarkSweep::adjust_marks() { |
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115 assert( _preserved_oop_stack.size() == _preserved_mark_stack.size(), |
0 | 116 "inconsistent preserved oop stacks"); |
117 | |
118 // adjust the oops we saved earlier | |
119 for (size_t i = 0; i < _preserved_count; i++) { | |
120 _preserved_marks[i].adjust_pointer(); | |
121 } | |
122 | |
123 // deal with the overflow stack | |
6197 | 124 StackIterator<oop, mtGC> iter(_preserved_oop_stack); |
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125 while (!iter.is_empty()) { |
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126 oop* p = iter.next_addr(); |
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127 adjust_pointer(p); |
0 | 128 } |
129 } | |
130 | |
131 void MarkSweep::restore_marks() { | |
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132 assert(_preserved_oop_stack.size() == _preserved_mark_stack.size(), |
0 | 133 "inconsistent preserved oop stacks"); |
134 if (PrintGC && Verbose) { | |
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135 gclog_or_tty->print_cr("Restoring %d marks", |
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136 _preserved_count + _preserved_oop_stack.size()); |
0 | 137 } |
138 | |
139 // restore the marks we saved earlier | |
140 for (size_t i = 0; i < _preserved_count; i++) { | |
141 _preserved_marks[i].restore(); | |
142 } | |
143 | |
144 // deal with the overflow | |
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145 while (!_preserved_oop_stack.is_empty()) { |
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146 oop obj = _preserved_oop_stack.pop(); |
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147 markOop mark = _preserved_mark_stack.pop(); |
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148 obj->set_mark(mark); |
0 | 149 } |
150 } | |
151 | |
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152 MarkSweep::IsAliveClosure MarkSweep::is_alive; |
0 | 153 |
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154 bool MarkSweep::IsAliveClosure::do_object_b(oop p) { return p->is_gc_marked(); } |
0 | 155 |
156 MarkSweep::KeepAliveClosure MarkSweep::keep_alive; | |
157 | |
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158 void MarkSweep::KeepAliveClosure::do_oop(oop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } |
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159 void MarkSweep::KeepAliveClosure::do_oop(narrowOop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } |
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160 |
10405 | 161 void marksweep_init() { |
162 MarkSweep::_gc_timer = new (ResourceObj::C_HEAP, mtGC) STWGCTimer(); | |
163 MarkSweep::_gc_tracer = new (ResourceObj::C_HEAP, mtGC) SerialOldTracer(); | |
164 } | |
0 | 165 |
166 #ifndef PRODUCT | |
167 | |
168 void MarkSweep::trace(const char* msg) { | |
169 if (TraceMarkSweep) | |
170 gclog_or_tty->print("%s", msg); | |
171 } | |
172 | |
173 #endif |