Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/markSweep.hpp @ 989:148e5441d916
6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr
author | jrose |
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date | Tue, 15 Sep 2009 21:53:47 -0700 |
parents | d1605aabd0a1 |
children | 54b3b351d6f9 |
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 }; |
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); |
0 | 66 }; |
67 | |
68 class FollowStackClosure: public VoidClosure { | |
69 public: | |
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70 virtual void do_void(); |
0 | 71 }; |
72 | |
73 class AdjustPointerClosure: public OopsInGenClosure { | |
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74 private: |
0 | 75 bool _is_root; |
76 public: | |
77 AdjustPointerClosure(bool is_root) : _is_root(is_root) {} | |
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78 virtual void do_oop(oop* p); |
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79 virtual void do_oop(narrowOop* p); |
0 | 80 }; |
81 | |
82 // Used for java/lang/ref handling | |
83 class IsAliveClosure: public BoolObjectClosure { | |
84 public: | |
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85 virtual void do_object(oop p); |
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86 virtual bool do_object_b(oop p); |
0 | 87 }; |
88 | |
89 class KeepAliveClosure: public OopClosure { | |
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90 protected: |
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91 template <class T> void do_oop_work(T* p); |
0 | 92 public: |
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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 // | |
98 // Friend decls | |
99 // | |
100 friend class AdjustPointerClosure; | |
101 friend class KeepAliveClosure; | |
102 friend class VM_MarkSweep; | |
103 friend void marksweep_init(); | |
104 | |
105 // | |
106 // Vars | |
107 // | |
108 protected: | |
109 // Traversal stack used during phase1 | |
110 static GrowableArray<oop>* _marking_stack; | |
111 // Stack for live klasses to revisit at end of marking phase | |
112 static GrowableArray<Klass*>* _revisit_klass_stack; | |
113 | |
114 // Space for storing/restoring mark word | |
115 static GrowableArray<markOop>* _preserved_mark_stack; | |
116 static GrowableArray<oop>* _preserved_oop_stack; | |
117 static size_t _preserved_count; | |
118 static size_t _preserved_count_max; | |
119 static PreservedMark* _preserved_marks; | |
120 | |
121 // Reference processing (used in ...follow_contents) | |
122 static ReferenceProcessor* _ref_processor; | |
123 | |
124 #ifdef VALIDATE_MARK_SWEEP | |
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125 static GrowableArray<void*>* _root_refs_stack; |
0 | 126 static GrowableArray<oop> * _live_oops; |
127 static GrowableArray<oop> * _live_oops_moved_to; | |
128 static GrowableArray<size_t>* _live_oops_size; | |
129 static size_t _live_oops_index; | |
130 static size_t _live_oops_index_at_perm; | |
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131 static GrowableArray<void*>* _other_refs_stack; |
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132 static GrowableArray<void*>* _adjusted_pointers; |
0 | 133 static bool _pointer_tracking; |
134 static bool _root_tracking; | |
135 | |
136 // The following arrays are saved since the time of the last GC and | |
137 // assist in tracking down problems where someone has done an errant | |
138 // store into the heap, usually to an oop that wasn't properly | |
139 // handleized across a GC. If we crash or otherwise fail before the | |
140 // next GC, we can query these arrays to find out the object we had | |
141 // intended to do the store to (assuming it is still alive) and the | |
142 // offset within that object. Covered under RecordMarkSweepCompaction. | |
143 static GrowableArray<HeapWord*> * _cur_gc_live_oops; | |
144 static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; | |
145 static GrowableArray<size_t>* _cur_gc_live_oops_size; | |
146 static GrowableArray<HeapWord*> * _last_gc_live_oops; | |
147 static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; | |
148 static GrowableArray<size_t>* _last_gc_live_oops_size; | |
149 #endif | |
150 | |
151 // Non public closures | |
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152 static IsAliveClosure is_alive; |
0 | 153 static KeepAliveClosure keep_alive; |
154 | |
155 // Class unloading. Update subklass/sibling/implementor links at end of marking phase. | |
156 static void follow_weak_klass_links(); | |
157 | |
158 // Debugging | |
159 static void trace(const char* msg) PRODUCT_RETURN; | |
160 | |
161 public: | |
162 // Public closures | |
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163 static FollowRootClosure follow_root_closure; |
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164 static CodeBlobToOopClosure follow_code_root_closure; // => follow_root_closure |
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165 static MarkAndPushClosure mark_and_push_closure; |
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166 static FollowStackClosure follow_stack_closure; |
0 | 167 static AdjustPointerClosure adjust_root_pointer_closure; |
168 static AdjustPointerClosure adjust_pointer_closure; | |
169 | |
170 // Reference Processing | |
171 static ReferenceProcessor* const ref_processor() { return _ref_processor; } | |
172 | |
173 // Call backs for marking | |
174 static void mark_object(oop obj); | |
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175 // Mark pointer and follow contents. Empty marking stack afterwards. |
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176 template <class T> static inline void follow_root(T* p); |
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177 // Mark pointer and follow contents. |
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178 template <class T> static inline void mark_and_follow(T* p); |
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179 // Check mark and maybe push on marking stack |
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180 template <class T> static inline void mark_and_push(T* p); |
0 | 181 |
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182 static void follow_stack(); // Empty marking stack. |
0 | 183 |
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184 static void preserve_mark(oop p, markOop mark); |
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185 // Save the mark word so it can be restored later |
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186 static void adjust_marks(); // Adjust the pointers in the preserved marks table |
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187 static void restore_marks(); // Restore the marks that we saved in preserve_mark |
0 | 188 |
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189 template <class T> static inline void adjust_pointer(T* p, bool isroot); |
0 | 190 |
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191 static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
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192 static void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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193 static void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
0 | 194 |
195 #ifdef VALIDATE_MARK_SWEEP | |
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196 static void track_adjusted_pointer(void* p, bool isroot); |
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197 static void check_adjust_pointer(void* p); |
0 | 198 static void track_interior_pointers(oop obj); |
199 static void check_interior_pointers(); | |
200 | |
201 static void reset_live_oop_tracking(bool at_perm); | |
202 static void register_live_oop(oop p, size_t size); | |
203 static void validate_live_oop(oop p, size_t size); | |
204 static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); | |
205 static void compaction_complete(); | |
206 | |
207 // Querying operation of RecordMarkSweepCompaction results. | |
208 // Finds and prints the current base oop and offset for a word | |
209 // within an oop that was live during the last GC. Helpful for | |
210 // tracking down heap stomps. | |
211 static void print_new_location_of_heap_address(HeapWord* q); | |
212 #endif | |
213 | |
214 // Call backs for class unloading | |
215 static void revisit_weak_klass_link(Klass* k); // Update subklass/sibling/implementor links at end of marking. | |
216 }; | |
217 | |
218 class PreservedMark VALUE_OBJ_CLASS_SPEC { | |
219 private: | |
220 oop _obj; | |
221 markOop _mark; | |
222 | |
223 public: | |
224 void init(oop obj, markOop mark) { | |
225 _obj = obj; | |
226 _mark = mark; | |
227 } | |
228 | |
229 void adjust_pointer() { | |
230 MarkSweep::adjust_pointer(&_obj); | |
231 } | |
232 | |
233 void restore() { | |
234 _obj->set_mark(_mark); | |
235 } | |
236 }; |