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comparison: src/share/vm/gc_implementation/shared/markSweep.hpp
src/share/vm/gc_implementation/shared/markSweep.hpp
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| 1 /* | |
| 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. | |
| 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 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 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 | |
| 37 class ReferenceProcessor; | |
| 38 class DataLayout; | |
| 39 class SerialOldTracer; | |
| 40 class STWGCTimer; | |
| 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 // | |
| 54 // Inline closure decls | |
| 55 // | |
| 56 class FollowRootClosure: public OopsInGenClosure { | |
| 57 public: | |
| 58 virtual void do_oop(oop* p); | |
| 59 virtual void do_oop(narrowOop* p); | |
| 60 }; | |
| 61 | |
| 62 class MarkAndPushClosure: public OopClosure { | |
| 63 public: | |
| 64 virtual void do_oop(oop* p); | |
| 65 virtual void do_oop(narrowOop* p); | |
| 66 }; | |
| 67 | |
| 68 // The one and only place to start following the classes. | |
| 69 // Should only be applied to the ClassLoaderData klasses list. | |
| 70 class FollowKlassClosure : public KlassClosure { | |
| 71 public: | |
| 72 void do_klass(Klass* klass); | |
| 73 }; | |
| 74 class AdjustKlassClosure : public KlassClosure { | |
| 75 public: | |
| 76 void do_klass(Klass* klass); | |
| 77 }; | |
| 78 | |
| 79 class FollowStackClosure: public VoidClosure { | |
| 80 public: | |
| 81 virtual void do_void(); | |
| 82 }; | |
| 83 | |
| 84 class AdjustPointerClosure: public OopsInGenClosure { | |
| 85 public: | |
| 86 virtual void do_oop(oop* p); | |
| 87 virtual void do_oop(narrowOop* p); | |
| 88 }; | |
| 89 | |
| 90 // Used for java/lang/ref handling | |
| 91 class IsAliveClosure: public BoolObjectClosure { | |
| 92 public: | |
| 93 virtual bool do_object_b(oop p); | |
| 94 }; | |
| 95 | |
| 96 class KeepAliveClosure: public OopClosure { | |
| 97 protected: | |
| 98 template <class T> void do_oop_work(T* p); | |
| 99 public: | |
| 100 virtual void do_oop(oop* p); | |
| 101 virtual void do_oop(narrowOop* p); | |
| 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: | |
| 116 // Total invocations of a MarkSweep collection | |
| 117 static uint _total_invocations; | |
| 118 | |
| 119 // Traversal stacks used during phase1 | |
| 120 static Stack<oop, mtGC> _marking_stack; | |
| 121 static Stack<ObjArrayTask, mtGC> _objarray_stack; | |
| 122 | |
| 123 // Space for storing/restoring mark word | |
| 124 static Stack<markOop, mtGC> _preserved_mark_stack; | |
| 125 static Stack<oop, mtGC> _preserved_oop_stack; | |
| 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 | |
| 133 static STWGCTimer* _gc_timer; | |
| 134 static SerialOldTracer* _gc_tracer; | |
| 135 | |
| 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 | |
| 144 static IsAliveClosure is_alive; | |
| 145 static FollowRootClosure follow_root_closure; | |
| 146 static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure | |
| 147 static MarkAndPushClosure mark_and_push_closure; | |
| 148 static FollowKlassClosure follow_klass_closure; | |
| 149 static FollowStackClosure follow_stack_closure; | |
| 150 static AdjustPointerClosure adjust_pointer_closure; | |
| 151 static AdjustKlassClosure adjust_klass_closure; | |
| 152 | |
| 153 // Accessors | |
| 154 static uint total_invocations() { return _total_invocations; } | |
| 155 | |
| 156 // Reference Processing | |
| 157 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
| 158 | |
| 159 static STWGCTimer* gc_timer() { return _gc_timer; } | |
| 160 static SerialOldTracer* gc_tracer() { return _gc_tracer; } | |
| 161 | |
| 162 // Call backs for marking | |
| 163 static void mark_object(oop obj); | |
| 164 // Mark pointer and follow contents. Empty marking stack afterwards. | |
| 165 template <class T> static inline void follow_root(T* p); | |
| 166 | |
| 167 // Check mark and maybe push on marking stack | |
| 168 template <class T> static void mark_and_push(T* p); | |
| 169 | |
| 170 static inline void push_objarray(oop obj, size_t index); | |
| 171 | |
| 172 static void follow_stack(); // Empty marking stack. | |
| 173 | |
| 174 static void follow_klass(Klass* klass); | |
| 175 | |
| 176 static void follow_class_loader(ClassLoaderData* cld); | |
| 177 | |
| 178 static void preserve_mark(oop p, markOop mark); | |
| 179 // Save the mark word so it can be restored later | |
| 180 static void adjust_marks(); // Adjust the pointers in the preserved marks table | |
| 181 static void restore_marks(); // Restore the marks that we saved in preserve_mark | |
| 182 | |
| 183 template <class T> static inline void adjust_pointer(T* p); | |
| 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 }; | |
| 205 | |
| 206 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |
