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comparison: src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp

src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp

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1 /*
2 * Copyright (c) 2007, 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_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP
27
28 #include "memory/genOopClosures.hpp"
29
30 /////////////////////////////////////////////////////////////////
31 // Closures used by ConcurrentMarkSweepGeneration's collector
32 /////////////////////////////////////////////////////////////////
33 class ConcurrentMarkSweepGeneration;
34 class CMSBitMap;
35 class CMSMarkStack;
36 class CMSCollector;
37 class MarkFromRootsClosure;
38 class Par_MarkFromRootsClosure;
39
40 // Decode the oop and call do_oop on it.
41 #define DO_OOP_WORK_DEFN \
42 void do_oop(oop obj); \
43 template <class T> inline void do_oop_work(T* p) { \
44 T heap_oop = oopDesc::load_heap_oop(p); \
45 if (!oopDesc::is_null(heap_oop)) { \
46 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); \
47 do_oop(obj); \
48 } \
49 }
50
51 // Applies the given oop closure to all oops in all klasses visited.
52 class CMKlassClosure : public KlassClosure {
53 friend class CMSOopClosure;
54 friend class CMSOopsInGenClosure;
55
56 OopClosure* _oop_closure;
57
58 // Used when _oop_closure couldn't be set in an initialization list.
59 void initialize(OopClosure* oop_closure) {
60 assert(_oop_closure == NULL, "Should only be called once");
61 _oop_closure = oop_closure;
62 }
63 public:
64 CMKlassClosure(OopClosure* oop_closure = NULL) : _oop_closure(oop_closure) { }
65
66 void do_klass(Klass* k);
67 };
68
69 // The base class for all CMS marking closures.
70 // It's used to proxy through the metadata to the oops defined in them.
71 class CMSOopClosure: public ExtendedOopClosure {
72 CMKlassClosure _klass_closure;
73 public:
74 CMSOopClosure() : ExtendedOopClosure() {
75 _klass_closure.initialize(this);
76 }
77 CMSOopClosure(ReferenceProcessor* rp) : ExtendedOopClosure(rp) {
78 _klass_closure.initialize(this);
79 }
80
81 virtual bool do_metadata() { return do_metadata_nv(); }
82 inline bool do_metadata_nv() { return true; }
83
84 virtual void do_klass(Klass* k);
85 void do_klass_nv(Klass* k);
86
87 virtual void do_class_loader_data(ClassLoaderData* cld);
88 };
89
90 // TODO: This duplication of the CMSOopClosure class is only needed because
91 // some CMS OopClosures derive from OopsInGenClosure. It would be good
92 // to get rid of them completely.
93 class CMSOopsInGenClosure: public OopsInGenClosure {
94 CMKlassClosure _klass_closure;
95 public:
96 CMSOopsInGenClosure() {
97 _klass_closure.initialize(this);
98 }
99
100 virtual bool do_metadata() { return do_metadata_nv(); }
101 inline bool do_metadata_nv() { return true; }
102
103 virtual void do_klass(Klass* k);
104 void do_klass_nv(Klass* k);
105
106 virtual void do_class_loader_data(ClassLoaderData* cld);
107 };
108
109 class MarkRefsIntoClosure: public CMSOopsInGenClosure {
110 private:
111 const MemRegion _span;
112 CMSBitMap* _bitMap;
113 protected:
114 DO_OOP_WORK_DEFN
115 public:
116 MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap);
117 virtual void do_oop(oop* p);
118 virtual void do_oop(narrowOop* p);
119
120 Prefetch::style prefetch_style() {
121 return Prefetch::do_read;
122 }
123 };
124
125 class Par_MarkRefsIntoClosure: public CMSOopsInGenClosure {
126 private:
127 const MemRegion _span;
128 CMSBitMap* _bitMap;
129 protected:
130 DO_OOP_WORK_DEFN
131 public:
132 Par_MarkRefsIntoClosure(MemRegion span, CMSBitMap* bitMap);
133 virtual void do_oop(oop* p);
134 virtual void do_oop(narrowOop* p);
135
136 Prefetch::style prefetch_style() {
137 return Prefetch::do_read;
138 }
139 };
140
141 // A variant of the above used in certain kinds of CMS
142 // marking verification.
143 class MarkRefsIntoVerifyClosure: public CMSOopsInGenClosure {
144 private:
145 const MemRegion _span;
146 CMSBitMap* _verification_bm;
147 CMSBitMap* _cms_bm;
148 protected:
149 DO_OOP_WORK_DEFN
150 public:
151 MarkRefsIntoVerifyClosure(MemRegion span, CMSBitMap* verification_bm,
152 CMSBitMap* cms_bm);
153 virtual void do_oop(oop* p);
154 virtual void do_oop(narrowOop* p);
155
156 Prefetch::style prefetch_style() {
157 return Prefetch::do_read;
158 }
159 };
160
161 // The non-parallel version (the parallel version appears further below).
162 class PushAndMarkClosure: public CMSOopClosure {
163 private:
164 CMSCollector* _collector;
165 MemRegion _span;
166 CMSBitMap* _bit_map;
167 CMSBitMap* _mod_union_table;
168 CMSMarkStack* _mark_stack;
169 bool _concurrent_precleaning;
170 protected:
171 DO_OOP_WORK_DEFN
172 public:
173 PushAndMarkClosure(CMSCollector* collector,
174 MemRegion span,
175 ReferenceProcessor* rp,
176 CMSBitMap* bit_map,
177 CMSBitMap* mod_union_table,
178 CMSMarkStack* mark_stack,
179 bool concurrent_precleaning);
180 virtual void do_oop(oop* p);
181 virtual void do_oop(narrowOop* p);
182 inline void do_oop_nv(oop* p) { PushAndMarkClosure::do_oop_work(p); }
183 inline void do_oop_nv(narrowOop* p) { PushAndMarkClosure::do_oop_work(p); }
184
185 Prefetch::style prefetch_style() {
186 return Prefetch::do_read;
187 }
188 };
189
190 // In the parallel case, the bit map and the
191 // reference processor are currently all shared. Access to
192 // these shared mutable structures must use appropriate
193 // synchronization (for instance, via CAS). The marking stack
194 // used in the non-parallel case above is here replaced with
195 // an OopTaskQueue structure to allow efficient work stealing.
196 class Par_PushAndMarkClosure: public CMSOopClosure {
197 private:
198 CMSCollector* _collector;
199 MemRegion _span;
200 CMSBitMap* _bit_map;
201 OopTaskQueue* _work_queue;
202 protected:
203 DO_OOP_WORK_DEFN
204 public:
205 Par_PushAndMarkClosure(CMSCollector* collector,
206 MemRegion span,
207 ReferenceProcessor* rp,
208 CMSBitMap* bit_map,
209 OopTaskQueue* work_queue);
210 virtual void do_oop(oop* p);
211 virtual void do_oop(narrowOop* p);
212 inline void do_oop_nv(oop* p) { Par_PushAndMarkClosure::do_oop_work(p); }
213 inline void do_oop_nv(narrowOop* p) { Par_PushAndMarkClosure::do_oop_work(p); }
214
215 Prefetch::style prefetch_style() {
216 return Prefetch::do_read;
217 }
218 };
219
220 // The non-parallel version (the parallel version appears further below).
221 class MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure {
222 private:
223 MemRegion _span;
224 CMSBitMap* _bit_map;
225 CMSMarkStack* _mark_stack;
226 PushAndMarkClosure _pushAndMarkClosure;
227 CMSCollector* _collector;
228 Mutex* _freelistLock;
229 bool _yield;
230 // Whether closure is being used for concurrent precleaning
231 bool _concurrent_precleaning;
232 protected:
233 DO_OOP_WORK_DEFN
234 public:
235 MarkRefsIntoAndScanClosure(MemRegion span,
236 ReferenceProcessor* rp,
237 CMSBitMap* bit_map,
238 CMSBitMap* mod_union_table,
239 CMSMarkStack* mark_stack,
240 CMSCollector* collector,
241 bool should_yield,
242 bool concurrent_precleaning);
243 virtual void do_oop(oop* p);
244 virtual void do_oop(narrowOop* p);
245 inline void do_oop_nv(oop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); }
246 inline void do_oop_nv(narrowOop* p) { MarkRefsIntoAndScanClosure::do_oop_work(p); }
247
248 Prefetch::style prefetch_style() {
249 return Prefetch::do_read;
250 }
251 void set_freelistLock(Mutex* m) {
252 _freelistLock = m;
253 }
254
255 private:
256 inline void do_yield_check();
257 void do_yield_work();
258 bool take_from_overflow_list();
259 };
260
261 // Tn this, the parallel avatar of MarkRefsIntoAndScanClosure, the revisit
262 // stack and the bitMap are shared, so access needs to be suitably
263 // sycnhronized. An OopTaskQueue structure, supporting efficient
264 // workstealing, replaces a CMSMarkStack for storing grey objects.
265 class Par_MarkRefsIntoAndScanClosure: public CMSOopsInGenClosure {
266 private:
267 MemRegion _span;
268 CMSBitMap* _bit_map;
269 OopTaskQueue* _work_queue;
270 const uint _low_water_mark;
271 Par_PushAndMarkClosure _par_pushAndMarkClosure;
272 protected:
273 DO_OOP_WORK_DEFN
274 public:
275 Par_MarkRefsIntoAndScanClosure(CMSCollector* collector,
276 MemRegion span,
277 ReferenceProcessor* rp,
278 CMSBitMap* bit_map,
279 OopTaskQueue* work_queue);
280 virtual void do_oop(oop* p);
281 virtual void do_oop(narrowOop* p);
282 inline void do_oop_nv(oop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); }
283 inline void do_oop_nv(narrowOop* p) { Par_MarkRefsIntoAndScanClosure::do_oop_work(p); }
284
285 Prefetch::style prefetch_style() {
286 return Prefetch::do_read;
287 }
288 void trim_queue(uint size);
289 };
290
291 // This closure is used during the concurrent marking phase
292 // following the first checkpoint. Its use is buried in
293 // the closure MarkFromRootsClosure.
294 class PushOrMarkClosure: public CMSOopClosure {
295 private:
296 CMSCollector* _collector;
297 MemRegion _span;
298 CMSBitMap* _bitMap;
299 CMSMarkStack* _markStack;
300 HeapWord* const _finger;
301 MarkFromRootsClosure* const
302 _parent;
303 protected:
304 DO_OOP_WORK_DEFN
305 public:
306 PushOrMarkClosure(CMSCollector* cms_collector,
307 MemRegion span,
308 CMSBitMap* bitMap,
309 CMSMarkStack* markStack,
310 HeapWord* finger,
311 MarkFromRootsClosure* parent);
312 virtual void do_oop(oop* p);
313 virtual void do_oop(narrowOop* p);
314 inline void do_oop_nv(oop* p) { PushOrMarkClosure::do_oop_work(p); }
315 inline void do_oop_nv(narrowOop* p) { PushOrMarkClosure::do_oop_work(p); }
316
317 // Deal with a stack overflow condition
318 void handle_stack_overflow(HeapWord* lost);
319 private:
320 inline void do_yield_check();
321 };
322
323 // A parallel (MT) version of the above.
324 // This closure is used during the concurrent marking phase
325 // following the first checkpoint. Its use is buried in
326 // the closure Par_MarkFromRootsClosure.
327 class Par_PushOrMarkClosure: public CMSOopClosure {
328 private:
329 CMSCollector* _collector;
330 MemRegion _whole_span;
331 MemRegion _span; // local chunk
332 CMSBitMap* _bit_map;
333 OopTaskQueue* _work_queue;
334 CMSMarkStack* _overflow_stack;
335 HeapWord* const _finger;
336 HeapWord** const _global_finger_addr;
337 Par_MarkFromRootsClosure* const
338 _parent;
339 protected:
340 DO_OOP_WORK_DEFN
341 public:
342 Par_PushOrMarkClosure(CMSCollector* cms_collector,
343 MemRegion span,
344 CMSBitMap* bit_map,
345 OopTaskQueue* work_queue,
346 CMSMarkStack* mark_stack,
347 HeapWord* finger,
348 HeapWord** global_finger_addr,
349 Par_MarkFromRootsClosure* parent);
350 virtual void do_oop(oop* p);
351 virtual void do_oop(narrowOop* p);
352 inline void do_oop_nv(oop* p) { Par_PushOrMarkClosure::do_oop_work(p); }
353 inline void do_oop_nv(narrowOop* p) { Par_PushOrMarkClosure::do_oop_work(p); }
354
355 // Deal with a stack overflow condition
356 void handle_stack_overflow(HeapWord* lost);
357 private:
358 inline void do_yield_check();
359 };
360
361 // For objects in CMS generation, this closure marks
362 // given objects (transitively) as being reachable/live.
363 // This is currently used during the (weak) reference object
364 // processing phase of the CMS final checkpoint step, as
365 // well as during the concurrent precleaning of the discovered
366 // reference lists.
367 class CMSKeepAliveClosure: public CMSOopClosure {
368 private:
369 CMSCollector* _collector;
370 const MemRegion _span;
371 CMSMarkStack* _mark_stack;
372 CMSBitMap* _bit_map;
373 bool _concurrent_precleaning;
374 protected:
375 DO_OOP_WORK_DEFN
376 public:
377 CMSKeepAliveClosure(CMSCollector* collector, MemRegion span,
378 CMSBitMap* bit_map, CMSMarkStack* mark_stack,
379 bool cpc);
380 bool concurrent_precleaning() const { return _concurrent_precleaning; }
381 virtual void do_oop(oop* p);
382 virtual void do_oop(narrowOop* p);
383 inline void do_oop_nv(oop* p) { CMSKeepAliveClosure::do_oop_work(p); }
384 inline void do_oop_nv(narrowOop* p) { CMSKeepAliveClosure::do_oop_work(p); }
385 };
386
387 class CMSInnerParMarkAndPushClosure: public CMSOopClosure {
388 private:
389 CMSCollector* _collector;
390 MemRegion _span;
391 OopTaskQueue* _work_queue;
392 CMSBitMap* _bit_map;
393 protected:
394 DO_OOP_WORK_DEFN
395 public:
396 CMSInnerParMarkAndPushClosure(CMSCollector* collector,
397 MemRegion span, CMSBitMap* bit_map,
398 OopTaskQueue* work_queue);
399 virtual void do_oop(oop* p);
400 virtual void do_oop(narrowOop* p);
401 inline void do_oop_nv(oop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); }
402 inline void do_oop_nv(narrowOop* p) { CMSInnerParMarkAndPushClosure::do_oop_work(p); }
403 };
404
405 // A parallel (MT) version of the above, used when
406 // reference processing is parallel; the only difference
407 // is in the do_oop method.
408 class CMSParKeepAliveClosure: public CMSOopClosure {
409 private:
410 MemRegion _span;
411 OopTaskQueue* _work_queue;
412 CMSBitMap* _bit_map;
413 CMSInnerParMarkAndPushClosure
414 _mark_and_push;
415 const uint _low_water_mark;
416 void trim_queue(uint max);
417 protected:
418 DO_OOP_WORK_DEFN
419 public:
420 CMSParKeepAliveClosure(CMSCollector* collector, MemRegion span,
421 CMSBitMap* bit_map, OopTaskQueue* work_queue);
422 virtual void do_oop(oop* p);
423 virtual void do_oop(narrowOop* p);
424 };
425
426 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CMSOOPCLOSURES_HPP

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