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annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 21209:629cc690c4c6
Fix instanceof with checking arrays of interface
author | Stefan Anzinger <stefan.anzinger@oracle.com> |
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date | Thu, 30 Apr 2015 18:09:36 +0200 |
parents | 7848fc12602b |
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rev | line source |
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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 |
0 | 68 class FollowStackClosure: public VoidClosure { |
69 public: | |
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70 virtual void do_void(); |
0 | 71 }; |
72 | |
73 class AdjustPointerClosure: public OopsInGenClosure { | |
74 public: | |
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75 virtual void do_oop(oop* p); |
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76 virtual void do_oop(narrowOop* p); |
0 | 77 }; |
78 | |
79 // Used for java/lang/ref handling | |
80 class IsAliveClosure: public BoolObjectClosure { | |
81 public: | |
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82 virtual bool do_object_b(oop p); |
0 | 83 }; |
84 | |
85 class KeepAliveClosure: public OopClosure { | |
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86 protected: |
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87 template <class T> void do_oop_work(T* p); |
0 | 88 public: |
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89 virtual void do_oop(oop* p); |
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90 virtual void do_oop(narrowOop* p); |
0 | 91 }; |
92 | |
93 // | |
94 // Friend decls | |
95 // | |
96 friend class AdjustPointerClosure; | |
97 friend class KeepAliveClosure; | |
98 friend class VM_MarkSweep; | |
99 friend void marksweep_init(); | |
100 | |
101 // | |
102 // Vars | |
103 // | |
104 protected: | |
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105 // Total invocations of a MarkSweep collection |
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106 static uint _total_invocations; |
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107 |
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108 // Traversal stacks used during phase1 |
6197 | 109 static Stack<oop, mtGC> _marking_stack; |
110 static Stack<ObjArrayTask, mtGC> _objarray_stack; | |
0 | 111 |
112 // Space for storing/restoring mark word | |
6197 | 113 static Stack<markOop, mtGC> _preserved_mark_stack; |
114 static Stack<oop, mtGC> _preserved_oop_stack; | |
0 | 115 static size_t _preserved_count; |
116 static size_t _preserved_count_max; | |
117 static PreservedMark* _preserved_marks; | |
118 | |
119 // Reference processing (used in ...follow_contents) | |
120 static ReferenceProcessor* _ref_processor; | |
121 | |
10405 | 122 static STWGCTimer* _gc_timer; |
123 static SerialOldTracer* _gc_tracer; | |
124 | |
0 | 125 // Non public closures |
126 static KeepAliveClosure keep_alive; | |
127 | |
128 // Debugging | |
129 static void trace(const char* msg) PRODUCT_RETURN; | |
130 | |
131 public: | |
132 // Public closures | |
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133 static IsAliveClosure is_alive; |
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134 static FollowRootClosure follow_root_closure; |
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135 static MarkAndPushClosure mark_and_push_closure; |
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136 static FollowStackClosure follow_stack_closure; |
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137 static CLDToOopClosure follow_cld_closure; |
0 | 138 static AdjustPointerClosure adjust_pointer_closure; |
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139 static CLDToOopClosure adjust_cld_closure; |
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140 |
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141 // Accessors |
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142 static uint total_invocations() { return _total_invocations; } |
0 | 143 |
144 // Reference Processing | |
145 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
146 | |
10405 | 147 static STWGCTimer* gc_timer() { return _gc_timer; } |
148 static SerialOldTracer* gc_tracer() { return _gc_tracer; } | |
149 | |
0 | 150 // Call backs for marking |
151 static void mark_object(oop obj); | |
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152 // Mark pointer and follow contents. Empty marking stack afterwards. |
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153 template <class T> static inline void follow_root(T* p); |
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154 |
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155 // Check mark and maybe push on marking stack |
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156 template <class T> static void mark_and_push(T* p); |
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157 |
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158 static inline void push_objarray(oop obj, size_t index); |
0 | 159 |
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160 static void follow_stack(); // Empty marking stack. |
0 | 161 |
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162 static void follow_klass(Klass* klass); |
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163 |
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164 static void follow_class_loader(ClassLoaderData* cld); |
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165 |
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166 static void preserve_mark(oop p, markOop mark); |
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167 // Save the mark word so it can be restored later |
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168 static void adjust_marks(); // Adjust the pointers in the preserved marks table |
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169 static void restore_marks(); // Restore the marks that we saved in preserve_mark |
0 | 170 |
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171 template <class T> static inline void adjust_pointer(T* p); |
0 | 172 }; |
173 | |
174 class PreservedMark VALUE_OBJ_CLASS_SPEC { | |
175 private: | |
176 oop _obj; | |
177 markOop _mark; | |
178 | |
179 public: | |
180 void init(oop obj, markOop mark) { | |
181 _obj = obj; | |
182 _mark = mark; | |
183 } | |
184 | |
185 void adjust_pointer() { | |
186 MarkSweep::adjust_pointer(&_obj); | |
187 } | |
188 | |
189 void restore() { | |
190 _obj->set_mark(_mark); | |
191 } | |
192 }; | |
1972 | 193 |
194 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |