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annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 2a1472c30599 |
| children | 894b1d7c7e01 |
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| 0 | 1 /* |
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2 * Copyright (c) 1997, 2009, 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 | |
| 25 class ReferenceProcessor; | |
| 941 | 26 class DataLayout; |
| 0 | 27 |
| 28 // MarkSweep takes care of global mark-compact garbage collection for a | |
| 29 // GenCollectedHeap using a four-phase pointer forwarding algorithm. All | |
| 30 // generations are assumed to support marking; those that can also support | |
| 31 // compaction. | |
| 32 // | |
| 33 // Class unloading will only occur when a full gc is invoked. | |
| 34 | |
| 35 // If VALIDATE_MARK_SWEEP is defined, the -XX:+ValidateMarkSweep flag will | |
| 36 // be operational, and will provide slow but comprehensive self-checks within | |
| 37 // the GC. This is not enabled by default in product or release builds, | |
| 38 // since the extra call to track_adjusted_pointer() in _adjust_pointer() | |
| 39 // would be too much overhead, and would disturb performance measurement. | |
| 40 // However, debug builds are sometimes way too slow to run GC tests! | |
| 41 #ifdef ASSERT | |
| 42 #define VALIDATE_MARK_SWEEP 1 | |
| 43 #endif | |
| 44 #ifdef VALIDATE_MARK_SWEEP | |
| 45 #define VALIDATE_MARK_SWEEP_ONLY(code) code | |
| 46 #else | |
| 47 #define VALIDATE_MARK_SWEEP_ONLY(code) | |
| 48 #endif | |
| 49 | |
| 50 // declared at end | |
| 51 class PreservedMark; | |
| 52 | |
| 53 class MarkSweep : AllStatic { | |
| 54 // | |
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55 // Inline closure decls |
| 0 | 56 // |
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57 class FollowRootClosure: public OopsInGenClosure { |
| 0 | 58 public: |
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59 virtual void do_oop(oop* p); |
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60 virtual void do_oop(narrowOop* p); |
| 0 | 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); |
| 941 | 67 virtual const bool should_remember_mdo() const { return true; } |
| 68 virtual void remember_mdo(DataLayout* p) { MarkSweep::revisit_mdo(p); } | |
| 0 | 69 }; |
| 70 | |
| 71 class FollowStackClosure: public VoidClosure { | |
| 72 public: | |
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73 virtual void do_void(); |
| 0 | 74 }; |
| 75 | |
| 76 class AdjustPointerClosure: public OopsInGenClosure { | |
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77 private: |
| 0 | 78 bool _is_root; |
| 79 public: | |
| 80 AdjustPointerClosure(bool is_root) : _is_root(is_root) {} | |
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81 virtual void do_oop(oop* p); |
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82 virtual void do_oop(narrowOop* p); |
| 0 | 83 }; |
| 84 | |
| 85 // Used for java/lang/ref handling | |
| 86 class IsAliveClosure: public BoolObjectClosure { | |
| 87 public: | |
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88 virtual void do_object(oop p); |
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89 virtual bool do_object_b(oop p); |
| 0 | 90 }; |
| 91 | |
| 92 class KeepAliveClosure: public OopClosure { | |
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93 protected: |
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94 template <class T> void do_oop_work(T* p); |
| 0 | 95 public: |
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96 virtual void do_oop(oop* p); |
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97 virtual void do_oop(narrowOop* p); |
| 0 | 98 }; |
| 99 | |
| 100 // | |
| 101 // Friend decls | |
| 102 // | |
| 103 friend class AdjustPointerClosure; | |
| 104 friend class KeepAliveClosure; | |
| 105 friend class VM_MarkSweep; | |
| 106 friend void marksweep_init(); | |
| 941 | 107 friend class DataLayout; |
| 0 | 108 |
| 109 // | |
| 110 // Vars | |
| 111 // | |
| 112 protected: | |
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113 // Traversal stacks used during phase1 |
| 0 | 114 static GrowableArray<oop>* _marking_stack; |
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115 static GrowableArray<ObjArrayTask>* _objarray_stack; |
| 0 | 116 // Stack for live klasses to revisit at end of marking phase |
| 117 static GrowableArray<Klass*>* _revisit_klass_stack; | |
| 941 | 118 // Set (stack) of MDO's to revisit at end of marking phase |
| 119 static GrowableArray<DataLayout*>* _revisit_mdo_stack; | |
| 0 | 120 |
| 121 // Space for storing/restoring mark word | |
| 122 static GrowableArray<markOop>* _preserved_mark_stack; | |
| 123 static GrowableArray<oop>* _preserved_oop_stack; | |
| 124 static size_t _preserved_count; | |
| 125 static size_t _preserved_count_max; | |
| 126 static PreservedMark* _preserved_marks; | |
| 127 | |
| 128 // Reference processing (used in ...follow_contents) | |
| 129 static ReferenceProcessor* _ref_processor; | |
| 130 | |
| 131 #ifdef VALIDATE_MARK_SWEEP | |
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132 static GrowableArray<void*>* _root_refs_stack; |
| 0 | 133 static GrowableArray<oop> * _live_oops; |
| 134 static GrowableArray<oop> * _live_oops_moved_to; | |
| 135 static GrowableArray<size_t>* _live_oops_size; | |
| 136 static size_t _live_oops_index; | |
| 137 static size_t _live_oops_index_at_perm; | |
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138 static GrowableArray<void*>* _other_refs_stack; |
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139 static GrowableArray<void*>* _adjusted_pointers; |
| 0 | 140 static bool _pointer_tracking; |
| 141 static bool _root_tracking; | |
| 142 | |
| 143 // The following arrays are saved since the time of the last GC and | |
| 144 // assist in tracking down problems where someone has done an errant | |
| 145 // store into the heap, usually to an oop that wasn't properly | |
| 146 // handleized across a GC. If we crash or otherwise fail before the | |
| 147 // next GC, we can query these arrays to find out the object we had | |
| 148 // intended to do the store to (assuming it is still alive) and the | |
| 149 // offset within that object. Covered under RecordMarkSweepCompaction. | |
| 150 static GrowableArray<HeapWord*> * _cur_gc_live_oops; | |
| 151 static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; | |
| 152 static GrowableArray<size_t>* _cur_gc_live_oops_size; | |
| 153 static GrowableArray<HeapWord*> * _last_gc_live_oops; | |
| 154 static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; | |
| 155 static GrowableArray<size_t>* _last_gc_live_oops_size; | |
| 156 #endif | |
| 157 | |
| 158 // Non public closures | |
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159 static IsAliveClosure is_alive; |
| 0 | 160 static KeepAliveClosure keep_alive; |
| 161 | |
| 162 // Class unloading. Update subklass/sibling/implementor links at end of marking phase. | |
| 163 static void follow_weak_klass_links(); | |
| 164 | |
| 941 | 165 // Class unloading. Clear weak refs in MDO's (ProfileData) |
| 166 // at the end of the marking phase. | |
| 167 static void follow_mdo_weak_refs(); | |
| 168 | |
| 0 | 169 // Debugging |
| 170 static void trace(const char* msg) PRODUCT_RETURN; | |
| 171 | |
| 172 public: | |
| 173 // Public closures | |
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174 static FollowRootClosure follow_root_closure; |
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175 static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure |
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176 static MarkAndPushClosure mark_and_push_closure; |
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177 static FollowStackClosure follow_stack_closure; |
| 0 | 178 static AdjustPointerClosure adjust_root_pointer_closure; |
| 179 static AdjustPointerClosure adjust_pointer_closure; | |
| 180 | |
| 181 // Reference Processing | |
| 182 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
| 183 | |
| 184 // Call backs for marking | |
| 185 static void mark_object(oop obj); | |
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186 // Mark pointer and follow contents. Empty marking stack afterwards. |
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187 template <class T> static inline void follow_root(T* p); |
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188 // Mark pointer and follow contents. |
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189 template <class T> static inline void mark_and_follow(T* p); |
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190 // Check mark and maybe push on marking stack |
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191 template <class T> static inline void mark_and_push(T* p); |
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192 static inline void push_objarray(oop obj, size_t index); |
| 0 | 193 |
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194 static void follow_stack(); // Empty marking stack. |
| 0 | 195 |
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196 static void preserve_mark(oop p, markOop mark); |
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197 // Save the mark word so it can be restored later |
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198 static void adjust_marks(); // Adjust the pointers in the preserved marks table |
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199 static void restore_marks(); // Restore the marks that we saved in preserve_mark |
| 0 | 200 |
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201 template <class T> static inline void adjust_pointer(T* p, bool isroot); |
| 0 | 202 |
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203 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
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204 static void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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205 static void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
| 0 | 206 |
| 207 #ifdef VALIDATE_MARK_SWEEP | |
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208 static void track_adjusted_pointer(void* p, bool isroot); |
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209 static void check_adjust_pointer(void* p); |
| 0 | 210 static void track_interior_pointers(oop obj); |
| 211 static void check_interior_pointers(); | |
| 212 | |
| 213 static void reset_live_oop_tracking(bool at_perm); | |
| 214 static void register_live_oop(oop p, size_t size); | |
| 215 static void validate_live_oop(oop p, size_t size); | |
| 216 static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); | |
| 217 static void compaction_complete(); | |
| 218 | |
| 219 // Querying operation of RecordMarkSweepCompaction results. | |
| 220 // Finds and prints the current base oop and offset for a word | |
| 221 // within an oop that was live during the last GC. Helpful for | |
| 222 // tracking down heap stomps. | |
| 223 static void print_new_location_of_heap_address(HeapWord* q); | |
| 224 #endif | |
| 225 | |
| 226 // Call backs for class unloading | |
| 941 | 227 // Update subklass/sibling/implementor links at end of marking. |
| 228 static void revisit_weak_klass_link(Klass* k); | |
| 229 // For weak refs clearing in MDO's | |
| 230 static void revisit_mdo(DataLayout* p); | |
| 0 | 231 }; |
| 232 | |
| 233 class PreservedMark VALUE_OBJ_CLASS_SPEC { | |
| 234 private: | |
| 235 oop _obj; | |
| 236 markOop _mark; | |
| 237 | |
| 238 public: | |
| 239 void init(oop obj, markOop mark) { | |
| 240 _obj = obj; | |
| 241 _mark = mark; | |
| 242 } | |
| 243 | |
| 244 void adjust_pointer() { | |
| 245 MarkSweep::adjust_pointer(&_obj); | |
| 246 } | |
| 247 | |
| 248 void restore() { | |
| 249 _obj->set_mark(_mark); | |
| 250 } | |
| 251 }; |