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annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 196:d1605aabd0a1 jdk7-b30
6719955: Update copyright year
Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell
| author | xdono |
|---|---|
| date | Wed, 02 Jul 2008 12:55:16 -0700 |
| parents | ba764ed4b6f2 |
| children | 8b46c4d82093 148e5441d916 |
| rev | line source |
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| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 class ReferenceProcessor; | |
| 26 | |
| 27 // MarkSweep takes care of global mark-compact garbage collection for a | |
| 28 // GenCollectedHeap using a four-phase pointer forwarding algorithm. All | |
| 29 // generations are assumed to support marking; those that can also support | |
| 30 // compaction. | |
| 31 // | |
| 32 // Class unloading will only occur when a full gc is invoked. | |
| 33 | |
| 34 // If VALIDATE_MARK_SWEEP is defined, the -XX:+ValidateMarkSweep flag will | |
| 35 // be operational, and will provide slow but comprehensive self-checks within | |
| 36 // the GC. This is not enabled by default in product or release builds, | |
| 37 // since the extra call to track_adjusted_pointer() in _adjust_pointer() | |
| 38 // would be too much overhead, and would disturb performance measurement. | |
| 39 // However, debug builds are sometimes way too slow to run GC tests! | |
| 40 #ifdef ASSERT | |
| 41 #define VALIDATE_MARK_SWEEP 1 | |
| 42 #endif | |
| 43 #ifdef VALIDATE_MARK_SWEEP | |
| 44 #define VALIDATE_MARK_SWEEP_ONLY(code) code | |
| 45 #else | |
| 46 #define VALIDATE_MARK_SWEEP_ONLY(code) | |
| 47 #endif | |
| 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 virtual const bool do_nmethods() const { return true; } |
| 61 }; | |
| 62 | |
| 63 class MarkAndPushClosure: public OopClosure { | |
| 64 public: | |
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65 virtual void do_oop(oop* p); |
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66 virtual void do_oop(narrowOop* p); |
| 0 | 67 virtual const bool do_nmethods() const { return true; } |
| 68 }; | |
| 69 | |
| 70 class FollowStackClosure: public VoidClosure { | |
| 71 public: | |
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72 virtual void do_void(); |
| 0 | 73 }; |
| 74 | |
| 75 class AdjustPointerClosure: public OopsInGenClosure { | |
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76 private: |
| 0 | 77 bool _is_root; |
| 78 public: | |
| 79 AdjustPointerClosure(bool is_root) : _is_root(is_root) {} | |
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80 virtual void do_oop(oop* p); |
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81 virtual void do_oop(narrowOop* p); |
| 0 | 82 }; |
| 83 | |
| 84 // Used for java/lang/ref handling | |
| 85 class IsAliveClosure: public BoolObjectClosure { | |
| 86 public: | |
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87 virtual void do_object(oop p); |
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88 virtual bool do_object_b(oop p); |
| 0 | 89 }; |
| 90 | |
| 91 class KeepAliveClosure: public OopClosure { | |
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92 protected: |
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93 template <class T> void do_oop_work(T* p); |
| 0 | 94 public: |
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95 virtual void do_oop(oop* p); |
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96 virtual void do_oop(narrowOop* p); |
| 0 | 97 }; |
| 98 | |
| 99 // | |
| 100 // Friend decls | |
| 101 // | |
| 102 friend class AdjustPointerClosure; | |
| 103 friend class KeepAliveClosure; | |
| 104 friend class VM_MarkSweep; | |
| 105 friend void marksweep_init(); | |
| 106 | |
| 107 // | |
| 108 // Vars | |
| 109 // | |
| 110 protected: | |
| 111 // Traversal stack used during phase1 | |
| 112 static GrowableArray<oop>* _marking_stack; | |
| 113 // Stack for live klasses to revisit at end of marking phase | |
| 114 static GrowableArray<Klass*>* _revisit_klass_stack; | |
| 115 | |
| 116 // Space for storing/restoring mark word | |
| 117 static GrowableArray<markOop>* _preserved_mark_stack; | |
| 118 static GrowableArray<oop>* _preserved_oop_stack; | |
| 119 static size_t _preserved_count; | |
| 120 static size_t _preserved_count_max; | |
| 121 static PreservedMark* _preserved_marks; | |
| 122 | |
| 123 // Reference processing (used in ...follow_contents) | |
| 124 static ReferenceProcessor* _ref_processor; | |
| 125 | |
| 126 #ifdef VALIDATE_MARK_SWEEP | |
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127 static GrowableArray<void*>* _root_refs_stack; |
| 0 | 128 static GrowableArray<oop> * _live_oops; |
| 129 static GrowableArray<oop> * _live_oops_moved_to; | |
| 130 static GrowableArray<size_t>* _live_oops_size; | |
| 131 static size_t _live_oops_index; | |
| 132 static size_t _live_oops_index_at_perm; | |
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133 static GrowableArray<void*>* _other_refs_stack; |
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134 static GrowableArray<void*>* _adjusted_pointers; |
| 0 | 135 static bool _pointer_tracking; |
| 136 static bool _root_tracking; | |
| 137 | |
| 138 // The following arrays are saved since the time of the last GC and | |
| 139 // assist in tracking down problems where someone has done an errant | |
| 140 // store into the heap, usually to an oop that wasn't properly | |
| 141 // handleized across a GC. If we crash or otherwise fail before the | |
| 142 // next GC, we can query these arrays to find out the object we had | |
| 143 // intended to do the store to (assuming it is still alive) and the | |
| 144 // offset within that object. Covered under RecordMarkSweepCompaction. | |
| 145 static GrowableArray<HeapWord*> * _cur_gc_live_oops; | |
| 146 static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; | |
| 147 static GrowableArray<size_t>* _cur_gc_live_oops_size; | |
| 148 static GrowableArray<HeapWord*> * _last_gc_live_oops; | |
| 149 static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; | |
| 150 static GrowableArray<size_t>* _last_gc_live_oops_size; | |
| 151 #endif | |
| 152 | |
| 153 // Non public closures | |
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154 static IsAliveClosure is_alive; |
| 0 | 155 static KeepAliveClosure keep_alive; |
| 156 | |
| 157 // Class unloading. Update subklass/sibling/implementor links at end of marking phase. | |
| 158 static void follow_weak_klass_links(); | |
| 159 | |
| 160 // Debugging | |
| 161 static void trace(const char* msg) PRODUCT_RETURN; | |
| 162 | |
| 163 public: | |
| 164 // Public closures | |
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165 static FollowRootClosure follow_root_closure; |
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166 static MarkAndPushClosure mark_and_push_closure; |
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167 static FollowStackClosure follow_stack_closure; |
| 0 | 168 static AdjustPointerClosure adjust_root_pointer_closure; |
| 169 static AdjustPointerClosure adjust_pointer_closure; | |
| 170 | |
| 171 // Reference Processing | |
| 172 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
| 173 | |
| 174 // Call backs for marking | |
| 175 static void mark_object(oop obj); | |
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176 // Mark pointer and follow contents. Empty marking stack afterwards. |
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177 template <class T> static inline void follow_root(T* p); |
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178 // Mark pointer and follow contents. |
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179 template <class T> static inline void mark_and_follow(T* p); |
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180 // Check mark and maybe push on marking stack |
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181 template <class T> static inline void mark_and_push(T* p); |
| 0 | 182 |
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183 static void follow_stack(); // Empty marking stack. |
| 0 | 184 |
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185 static void preserve_mark(oop p, markOop mark); |
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186 // Save the mark word so it can be restored later |
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187 static void adjust_marks(); // Adjust the pointers in the preserved marks table |
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188 static void restore_marks(); // Restore the marks that we saved in preserve_mark |
| 0 | 189 |
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190 template <class T> static inline void adjust_pointer(T* p, bool isroot); |
| 0 | 191 |
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192 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
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193 static void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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194 static void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
| 0 | 195 |
| 196 #ifdef VALIDATE_MARK_SWEEP | |
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197 static void track_adjusted_pointer(void* p, bool isroot); |
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198 static void check_adjust_pointer(void* p); |
| 0 | 199 static void track_interior_pointers(oop obj); |
| 200 static void check_interior_pointers(); | |
| 201 | |
| 202 static void reset_live_oop_tracking(bool at_perm); | |
| 203 static void register_live_oop(oop p, size_t size); | |
| 204 static void validate_live_oop(oop p, size_t size); | |
| 205 static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); | |
| 206 static void compaction_complete(); | |
| 207 | |
| 208 // Querying operation of RecordMarkSweepCompaction results. | |
| 209 // Finds and prints the current base oop and offset for a word | |
| 210 // within an oop that was live during the last GC. Helpful for | |
| 211 // tracking down heap stomps. | |
| 212 static void print_new_location_of_heap_address(HeapWord* q); | |
| 213 #endif | |
| 214 | |
| 215 // Call backs for class unloading | |
| 216 static void revisit_weak_klass_link(Klass* k); // Update subklass/sibling/implementor links at end of marking. | |
| 217 }; | |
| 218 | |
| 219 class PreservedMark VALUE_OBJ_CLASS_SPEC { | |
| 220 private: | |
| 221 oop _obj; | |
| 222 markOop _mark; | |
| 223 | |
| 224 public: | |
| 225 void init(oop obj, markOop mark) { | |
| 226 _obj = obj; | |
| 227 _mark = mark; | |
| 228 } | |
| 229 | |
| 230 void adjust_pointer() { | |
| 231 MarkSweep::adjust_pointer(&_obj); | |
| 232 } | |
| 233 | |
| 234 void restore() { | |
| 235 _obj->set_mark(_mark); | |
| 236 } | |
| 237 }; |