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annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 7533:29b0768b7ba6
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author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 23 Jan 2013 16:49:55 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 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_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; |
0 | 39 |
40 // MarkSweep takes care of global mark-compact garbage collection for a | |
41 // GenCollectedHeap using a four-phase pointer forwarding algorithm. All | |
42 // generations are assumed to support marking; those that can also support | |
43 // compaction. | |
44 // | |
45 // Class unloading will only occur when a full gc is invoked. | |
46 | |
47 // declared at end | |
48 class PreservedMark; | |
49 | |
50 class MarkSweep : AllStatic { | |
51 // | |
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52 // Inline closure decls |
0 | 53 // |
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54 class FollowRootClosure: public OopsInGenClosure { |
0 | 55 public: |
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56 virtual void do_oop(oop* p); |
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57 virtual void do_oop(narrowOop* p); |
0 | 58 }; |
59 | |
60 class MarkAndPushClosure: public OopClosure { | |
61 public: | |
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62 virtual void do_oop(oop* p); |
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63 virtual void do_oop(narrowOop* p); |
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64 }; |
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65 |
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66 // The one and only place to start following the classes. |
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67 // Should only be applied to the ClassLoaderData klasses list. |
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68 class FollowKlassClosure : public KlassClosure { |
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69 public: |
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70 void do_klass(Klass* klass); |
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71 }; |
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72 class AdjustKlassClosure : public KlassClosure { |
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73 public: |
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74 void do_klass(Klass* klass); |
0 | 75 }; |
76 | |
77 class FollowStackClosure: public VoidClosure { | |
78 public: | |
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79 virtual void do_void(); |
0 | 80 }; |
81 | |
82 class AdjustPointerClosure: public OopsInGenClosure { | |
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83 private: |
0 | 84 bool _is_root; |
85 public: | |
86 AdjustPointerClosure(bool is_root) : _is_root(is_root) {} | |
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87 virtual void do_oop(oop* p); |
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88 virtual void do_oop(narrowOop* p); |
0 | 89 }; |
90 | |
91 // Used for java/lang/ref handling | |
92 class IsAliveClosure: public BoolObjectClosure { | |
93 public: | |
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94 virtual void do_object(oop p); |
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95 virtual bool do_object_b(oop p); |
0 | 96 }; |
97 | |
98 class KeepAliveClosure: public OopClosure { | |
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99 protected: |
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100 template <class T> void do_oop_work(T* p); |
0 | 101 public: |
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102 virtual void do_oop(oop* p); |
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103 virtual void do_oop(narrowOop* p); |
0 | 104 }; |
105 | |
106 // | |
107 // Friend decls | |
108 // | |
109 friend class AdjustPointerClosure; | |
110 friend class KeepAliveClosure; | |
111 friend class VM_MarkSweep; | |
112 friend void marksweep_init(); | |
113 | |
114 // | |
115 // Vars | |
116 // | |
117 protected: | |
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118 // Total invocations of a MarkSweep collection |
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119 static unsigned int _total_invocations; |
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120 |
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121 // Traversal stacks used during phase1 |
6197 | 122 static Stack<oop, mtGC> _marking_stack; |
123 static Stack<ObjArrayTask, mtGC> _objarray_stack; | |
0 | 124 |
125 // Space for storing/restoring mark word | |
6197 | 126 static Stack<markOop, mtGC> _preserved_mark_stack; |
127 static Stack<oop, mtGC> _preserved_oop_stack; | |
0 | 128 static size_t _preserved_count; |
129 static size_t _preserved_count_max; | |
130 static PreservedMark* _preserved_marks; | |
131 | |
132 // Reference processing (used in ...follow_contents) | |
133 static ReferenceProcessor* _ref_processor; | |
134 | |
135 // Non public closures | |
136 static KeepAliveClosure keep_alive; | |
137 | |
138 // Debugging | |
139 static void trace(const char* msg) PRODUCT_RETURN; | |
140 | |
141 public: | |
142 // Public closures | |
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143 static IsAliveClosure is_alive; |
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144 static FollowRootClosure follow_root_closure; |
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145 static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure |
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146 static MarkAndPushClosure mark_and_push_closure; |
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147 static FollowKlassClosure follow_klass_closure; |
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148 static FollowStackClosure follow_stack_closure; |
0 | 149 static AdjustPointerClosure adjust_root_pointer_closure; |
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 unsigned int total_invocations() { return _total_invocations; } |
0 | 155 |
156 // Reference Processing | |
157 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
158 | |
159 // Call backs for marking | |
160 static void mark_object(oop obj); | |
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161 // Mark pointer and follow contents. Empty marking stack afterwards. |
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162 template <class T> static inline void follow_root(T* p); |
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163 |
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164 // Check mark and maybe push on marking stack |
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165 template <class T> static void mark_and_push(T* p); |
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166 |
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167 static inline void push_objarray(oop obj, size_t index); |
0 | 168 |
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169 static void follow_stack(); // Empty marking stack. |
0 | 170 |
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171 static void follow_klass(Klass* klass); |
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172 static void adjust_klass(Klass* klass); |
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173 |
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174 static void follow_class_loader(ClassLoaderData* cld); |
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175 static void adjust_class_loader(ClassLoaderData* cld); |
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176 |
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177 static void preserve_mark(oop p, markOop mark); |
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178 // Save the mark word so it can be restored later |
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179 static void adjust_marks(); // Adjust the pointers in the preserved marks table |
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180 static void restore_marks(); // Restore the marks that we saved in preserve_mark |
0 | 181 |
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182 template <class T> static inline void adjust_pointer(T* p, bool isroot); |
0 | 183 |
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184 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
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185 static void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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186 static void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
0 | 187 |
188 }; | |
189 | |
190 class PreservedMark VALUE_OBJ_CLASS_SPEC { | |
191 private: | |
192 oop _obj; | |
193 markOop _mark; | |
194 | |
195 public: | |
196 void init(oop obj, markOop mark) { | |
197 _obj = obj; | |
198 _mark = mark; | |
199 } | |
200 | |
201 void adjust_pointer() { | |
202 MarkSweep::adjust_pointer(&_obj); | |
203 } | |
204 | |
205 void restore() { | |
206 _obj->set_mark(_mark); | |
207 } | |
208 }; | |
1972 | 209 |
210 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |