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annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 14213:6c4c27c5cc9a
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Reviewed-by: kvn
author | twisti |
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date | Fri, 06 Dec 2013 16:43:56 -0800 |
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0 | 1 /* |
10405 | 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP | |
27 | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "memory/universe.hpp" | |
30 #include "oops/markOop.hpp" | |
31 #include "oops/oop.hpp" | |
32 #include "runtime/timer.hpp" | |
33 #include "utilities/growableArray.hpp" | |
34 #include "utilities/stack.hpp" | |
35 #include "utilities/taskqueue.hpp" | |
36 | |
0 | 37 class ReferenceProcessor; |
941 | 38 class DataLayout; |
10405 | 39 class SerialOldTracer; |
40 class STWGCTimer; | |
0 | 41 |
42 // MarkSweep takes care of global mark-compact garbage collection for a | |
43 // GenCollectedHeap using a four-phase pointer forwarding algorithm. All | |
44 // generations are assumed to support marking; those that can also support | |
45 // compaction. | |
46 // | |
47 // Class unloading will only occur when a full gc is invoked. | |
48 | |
49 // declared at end | |
50 class PreservedMark; | |
51 | |
52 class MarkSweep : AllStatic { | |
53 // | |
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54 // Inline closure decls |
0 | 55 // |
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56 class FollowRootClosure: public OopsInGenClosure { |
0 | 57 public: |
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58 virtual void do_oop(oop* p); |
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59 virtual void do_oop(narrowOop* p); |
0 | 60 }; |
61 | |
62 class MarkAndPushClosure: public OopClosure { | |
63 public: | |
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64 virtual void do_oop(oop* p); |
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65 virtual void do_oop(narrowOop* p); |
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66 }; |
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67 |
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68 // The one and only place to start following the classes. |
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69 // Should only be applied to the ClassLoaderData klasses list. |
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70 class FollowKlassClosure : public KlassClosure { |
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71 public: |
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72 void do_klass(Klass* klass); |
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73 }; |
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74 class AdjustKlassClosure : public KlassClosure { |
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75 public: |
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76 void do_klass(Klass* klass); |
0 | 77 }; |
78 | |
79 class FollowStackClosure: public VoidClosure { | |
80 public: | |
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81 virtual void do_void(); |
0 | 82 }; |
83 | |
84 class AdjustPointerClosure: public OopsInGenClosure { | |
85 public: | |
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86 virtual void do_oop(oop* p); |
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87 virtual void do_oop(narrowOop* p); |
0 | 88 }; |
89 | |
90 // Used for java/lang/ref handling | |
91 class IsAliveClosure: public BoolObjectClosure { | |
92 public: | |
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93 virtual bool do_object_b(oop p); |
0 | 94 }; |
95 | |
96 class KeepAliveClosure: public OopClosure { | |
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97 protected: |
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98 template <class T> void do_oop_work(T* p); |
0 | 99 public: |
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100 virtual void do_oop(oop* p); |
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101 virtual void do_oop(narrowOop* p); |
0 | 102 }; |
103 | |
104 // | |
105 // Friend decls | |
106 // | |
107 friend class AdjustPointerClosure; | |
108 friend class KeepAliveClosure; | |
109 friend class VM_MarkSweep; | |
110 friend void marksweep_init(); | |
111 | |
112 // | |
113 // Vars | |
114 // | |
115 protected: | |
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116 // Total invocations of a MarkSweep collection |
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117 static uint _total_invocations; |
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118 |
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119 // Traversal stacks used during phase1 |
6197 | 120 static Stack<oop, mtGC> _marking_stack; |
121 static Stack<ObjArrayTask, mtGC> _objarray_stack; | |
0 | 122 |
123 // Space for storing/restoring mark word | |
6197 | 124 static Stack<markOop, mtGC> _preserved_mark_stack; |
125 static Stack<oop, mtGC> _preserved_oop_stack; | |
0 | 126 static size_t _preserved_count; |
127 static size_t _preserved_count_max; | |
128 static PreservedMark* _preserved_marks; | |
129 | |
130 // Reference processing (used in ...follow_contents) | |
131 static ReferenceProcessor* _ref_processor; | |
132 | |
10405 | 133 static STWGCTimer* _gc_timer; |
134 static SerialOldTracer* _gc_tracer; | |
135 | |
0 | 136 // Non public closures |
137 static KeepAliveClosure keep_alive; | |
138 | |
139 // Debugging | |
140 static void trace(const char* msg) PRODUCT_RETURN; | |
141 | |
142 public: | |
143 // Public closures | |
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144 static IsAliveClosure is_alive; |
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145 static FollowRootClosure follow_root_closure; |
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146 static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure |
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147 static MarkAndPushClosure mark_and_push_closure; |
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148 static FollowKlassClosure follow_klass_closure; |
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149 static FollowStackClosure follow_stack_closure; |
0 | 150 static AdjustPointerClosure adjust_pointer_closure; |
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151 static AdjustKlassClosure adjust_klass_closure; |
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152 |
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153 // Accessors |
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154 static uint total_invocations() { return _total_invocations; } |
0 | 155 |
156 // Reference Processing | |
157 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
158 | |
10405 | 159 static STWGCTimer* gc_timer() { return _gc_timer; } |
160 static SerialOldTracer* gc_tracer() { return _gc_tracer; } | |
161 | |
0 | 162 // Call backs for marking |
163 static void mark_object(oop obj); | |
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164 // Mark pointer and follow contents. Empty marking stack afterwards. |
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165 template <class T> static inline void follow_root(T* p); |
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166 |
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167 // Check mark and maybe push on marking stack |
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168 template <class T> static void mark_and_push(T* p); |
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169 |
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170 static inline void push_objarray(oop obj, size_t index); |
0 | 171 |
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172 static void follow_stack(); // Empty marking stack. |
0 | 173 |
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174 static void follow_klass(Klass* klass); |
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175 |
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176 static void follow_class_loader(ClassLoaderData* cld); |
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177 |
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178 static void preserve_mark(oop p, markOop mark); |
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179 // Save the mark word so it can be restored later |
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180 static void adjust_marks(); // Adjust the pointers in the preserved marks table |
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181 static void restore_marks(); // Restore the marks that we saved in preserve_mark |
0 | 182 |
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183 template <class T> static inline void adjust_pointer(T* p); |
0 | 184 }; |
185 | |
186 class PreservedMark VALUE_OBJ_CLASS_SPEC { | |
187 private: | |
188 oop _obj; | |
189 markOop _mark; | |
190 | |
191 public: | |
192 void init(oop obj, markOop mark) { | |
193 _obj = obj; | |
194 _mark = mark; | |
195 } | |
196 | |
197 void adjust_pointer() { | |
198 MarkSweep::adjust_pointer(&_obj); | |
199 } | |
200 | |
201 void restore() { | |
202 _obj->set_mark(_mark); | |
203 } | |
204 }; | |
1972 | 205 |
206 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |