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annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 2370:048f98400b8e
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author | jcoomes |
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date | Fri, 18 Mar 2011 09:03:43 -0700 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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 // If VALIDATE_MARK_SWEEP is defined, the -XX:+ValidateMarkSweep flag will | |
48 // be operational, and will provide slow but comprehensive self-checks within | |
49 // the GC. This is not enabled by default in product or release builds, | |
50 // since the extra call to track_adjusted_pointer() in _adjust_pointer() | |
51 // would be too much overhead, and would disturb performance measurement. | |
52 // However, debug builds are sometimes way too slow to run GC tests! | |
53 #ifdef ASSERT | |
54 #define VALIDATE_MARK_SWEEP 1 | |
55 #endif | |
56 #ifdef VALIDATE_MARK_SWEEP | |
57 #define VALIDATE_MARK_SWEEP_ONLY(code) code | |
58 #else | |
59 #define VALIDATE_MARK_SWEEP_ONLY(code) | |
60 #endif | |
61 | |
62 // declared at end | |
63 class PreservedMark; | |
64 | |
65 class MarkSweep : AllStatic { | |
66 // | |
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67 // Inline closure decls |
0 | 68 // |
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69 class FollowRootClosure: public OopsInGenClosure { |
0 | 70 public: |
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71 virtual void do_oop(oop* p); |
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72 virtual void do_oop(narrowOop* p); |
0 | 73 }; |
74 | |
75 class MarkAndPushClosure: public OopClosure { | |
76 public: | |
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77 virtual void do_oop(oop* p); |
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78 virtual void do_oop(narrowOop* p); |
941 | 79 virtual const bool should_remember_mdo() const { return true; } |
80 virtual void remember_mdo(DataLayout* p) { MarkSweep::revisit_mdo(p); } | |
0 | 81 }; |
82 | |
83 class FollowStackClosure: public VoidClosure { | |
84 public: | |
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85 virtual void do_void(); |
0 | 86 }; |
87 | |
88 class AdjustPointerClosure: public OopsInGenClosure { | |
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89 private: |
0 | 90 bool _is_root; |
91 public: | |
92 AdjustPointerClosure(bool is_root) : _is_root(is_root) {} | |
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93 virtual void do_oop(oop* p); |
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94 virtual void do_oop(narrowOop* p); |
0 | 95 }; |
96 | |
97 // Used for java/lang/ref handling | |
98 class IsAliveClosure: public BoolObjectClosure { | |
99 public: | |
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100 virtual void do_object(oop p); |
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101 virtual bool do_object_b(oop p); |
0 | 102 }; |
103 | |
104 class KeepAliveClosure: public OopClosure { | |
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105 protected: |
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106 template <class T> void do_oop_work(T* p); |
0 | 107 public: |
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108 virtual void do_oop(oop* p); |
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109 virtual void do_oop(narrowOop* p); |
0 | 110 }; |
111 | |
112 // | |
113 // Friend decls | |
114 // | |
115 friend class AdjustPointerClosure; | |
116 friend class KeepAliveClosure; | |
117 friend class VM_MarkSweep; | |
118 friend void marksweep_init(); | |
119 | |
120 // | |
121 // Vars | |
122 // | |
123 protected: | |
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124 // Traversal stacks used during phase1 |
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125 static Stack<oop> _marking_stack; |
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126 static Stack<ObjArrayTask> _objarray_stack; |
0 | 127 // Stack for live klasses to revisit at end of marking phase |
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128 static Stack<Klass*> _revisit_klass_stack; |
941 | 129 // Set (stack) of MDO's to revisit at end of marking phase |
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130 static Stack<DataLayout*> _revisit_mdo_stack; |
0 | 131 |
132 // Space for storing/restoring mark word | |
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133 static Stack<markOop> _preserved_mark_stack; |
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134 static Stack<oop> _preserved_oop_stack; |
0 | 135 static size_t _preserved_count; |
136 static size_t _preserved_count_max; | |
137 static PreservedMark* _preserved_marks; | |
138 | |
139 // Reference processing (used in ...follow_contents) | |
140 static ReferenceProcessor* _ref_processor; | |
141 | |
142 #ifdef VALIDATE_MARK_SWEEP | |
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143 static GrowableArray<void*>* _root_refs_stack; |
0 | 144 static GrowableArray<oop> * _live_oops; |
145 static GrowableArray<oop> * _live_oops_moved_to; | |
146 static GrowableArray<size_t>* _live_oops_size; | |
147 static size_t _live_oops_index; | |
148 static size_t _live_oops_index_at_perm; | |
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149 static GrowableArray<void*>* _other_refs_stack; |
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150 static GrowableArray<void*>* _adjusted_pointers; |
0 | 151 static bool _pointer_tracking; |
152 static bool _root_tracking; | |
153 | |
154 // The following arrays are saved since the time of the last GC and | |
155 // assist in tracking down problems where someone has done an errant | |
156 // store into the heap, usually to an oop that wasn't properly | |
157 // handleized across a GC. If we crash or otherwise fail before the | |
158 // next GC, we can query these arrays to find out the object we had | |
159 // intended to do the store to (assuming it is still alive) and the | |
160 // offset within that object. Covered under RecordMarkSweepCompaction. | |
161 static GrowableArray<HeapWord*> * _cur_gc_live_oops; | |
162 static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; | |
163 static GrowableArray<size_t>* _cur_gc_live_oops_size; | |
164 static GrowableArray<HeapWord*> * _last_gc_live_oops; | |
165 static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; | |
166 static GrowableArray<size_t>* _last_gc_live_oops_size; | |
167 #endif | |
168 | |
169 // Non public closures | |
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170 static IsAliveClosure is_alive; |
0 | 171 static KeepAliveClosure keep_alive; |
172 | |
173 // Class unloading. Update subklass/sibling/implementor links at end of marking phase. | |
174 static void follow_weak_klass_links(); | |
175 | |
941 | 176 // Class unloading. Clear weak refs in MDO's (ProfileData) |
177 // at the end of the marking phase. | |
178 static void follow_mdo_weak_refs(); | |
179 | |
0 | 180 // Debugging |
181 static void trace(const char* msg) PRODUCT_RETURN; | |
182 | |
183 public: | |
184 // Public closures | |
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185 static FollowRootClosure follow_root_closure; |
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186 static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure |
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187 static MarkAndPushClosure mark_and_push_closure; |
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188 static FollowStackClosure follow_stack_closure; |
0 | 189 static AdjustPointerClosure adjust_root_pointer_closure; |
190 static AdjustPointerClosure adjust_pointer_closure; | |
191 | |
192 // Reference Processing | |
193 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
194 | |
195 // Call backs for marking | |
196 static void mark_object(oop obj); | |
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197 // Mark pointer and follow contents. Empty marking stack afterwards. |
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198 template <class T> static inline void follow_root(T* p); |
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199 // Mark pointer and follow contents. |
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200 template <class T> static inline void mark_and_follow(T* p); |
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201 // Check mark and maybe push on marking stack |
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202 template <class T> static inline void mark_and_push(T* p); |
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203 static inline void push_objarray(oop obj, size_t index); |
0 | 204 |
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205 static void follow_stack(); // Empty marking stack. |
0 | 206 |
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207 static void preserve_mark(oop p, markOop mark); |
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208 // Save the mark word so it can be restored later |
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209 static void adjust_marks(); // Adjust the pointers in the preserved marks table |
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210 static void restore_marks(); // Restore the marks that we saved in preserve_mark |
0 | 211 |
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212 template <class T> static inline void adjust_pointer(T* p, bool isroot); |
0 | 213 |
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214 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
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215 static void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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216 static void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
0 | 217 |
218 #ifdef VALIDATE_MARK_SWEEP | |
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219 static void track_adjusted_pointer(void* p, bool isroot); |
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220 static void check_adjust_pointer(void* p); |
0 | 221 static void track_interior_pointers(oop obj); |
222 static void check_interior_pointers(); | |
223 | |
224 static void reset_live_oop_tracking(bool at_perm); | |
225 static void register_live_oop(oop p, size_t size); | |
226 static void validate_live_oop(oop p, size_t size); | |
227 static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); | |
228 static void compaction_complete(); | |
229 | |
230 // Querying operation of RecordMarkSweepCompaction results. | |
231 // Finds and prints the current base oop and offset for a word | |
232 // within an oop that was live during the last GC. Helpful for | |
233 // tracking down heap stomps. | |
234 static void print_new_location_of_heap_address(HeapWord* q); | |
235 #endif | |
236 | |
237 // Call backs for class unloading | |
941 | 238 // Update subklass/sibling/implementor links at end of marking. |
239 static void revisit_weak_klass_link(Klass* k); | |
240 // For weak refs clearing in MDO's | |
241 static void revisit_mdo(DataLayout* p); | |
0 | 242 }; |
243 | |
244 class PreservedMark VALUE_OBJ_CLASS_SPEC { | |
245 private: | |
246 oop _obj; | |
247 markOop _mark; | |
248 | |
249 public: | |
250 void init(oop obj, markOop mark) { | |
251 _obj = obj; | |
252 _mark = mark; | |
253 } | |
254 | |
255 void adjust_pointer() { | |
256 MarkSweep::adjust_pointer(&_obj); | |
257 } | |
258 | |
259 void restore() { | |
260 _obj->set_mark(_mark); | |
261 } | |
262 }; | |
1972 | 263 |
264 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MARKSWEEP_HPP |