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annotate src/share/vm/gc_implementation/shared/markSweep.cpp @ 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 | c385bf94cfb8 |
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 #include "incls/_precompiled.incl" | |
26 #include "incls/_markSweep.cpp.incl" | |
27 | |
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28 GrowableArray<oop>* MarkSweep::_marking_stack = NULL; |
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29 GrowableArray<ObjArrayTask>* MarkSweep::_objarray_stack = NULL; |
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30 GrowableArray<Klass*>* MarkSweep::_revisit_klass_stack = NULL; |
941 | 31 GrowableArray<DataLayout*>* MarkSweep::_revisit_mdo_stack = NULL; |
0 | 32 |
33 GrowableArray<oop>* MarkSweep::_preserved_oop_stack = NULL; | |
34 GrowableArray<markOop>* MarkSweep::_preserved_mark_stack= NULL; | |
35 size_t MarkSweep::_preserved_count = 0; | |
36 size_t MarkSweep::_preserved_count_max = 0; | |
37 PreservedMark* MarkSweep::_preserved_marks = NULL; | |
38 ReferenceProcessor* MarkSweep::_ref_processor = NULL; | |
39 | |
40 #ifdef VALIDATE_MARK_SWEEP | |
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41 GrowableArray<void*>* MarkSweep::_root_refs_stack = NULL; |
0 | 42 GrowableArray<oop> * MarkSweep::_live_oops = NULL; |
43 GrowableArray<oop> * MarkSweep::_live_oops_moved_to = NULL; | |
44 GrowableArray<size_t>* MarkSweep::_live_oops_size = NULL; | |
45 size_t MarkSweep::_live_oops_index = 0; | |
46 size_t MarkSweep::_live_oops_index_at_perm = 0; | |
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47 GrowableArray<void*>* MarkSweep::_other_refs_stack = NULL; |
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48 GrowableArray<void*>* MarkSweep::_adjusted_pointers = NULL; |
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49 bool MarkSweep::_pointer_tracking = false; |
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50 bool MarkSweep::_root_tracking = true; |
0 | 51 |
52 GrowableArray<HeapWord*>* MarkSweep::_cur_gc_live_oops = NULL; | |
53 GrowableArray<HeapWord*>* MarkSweep::_cur_gc_live_oops_moved_to = NULL; | |
54 GrowableArray<size_t> * MarkSweep::_cur_gc_live_oops_size = NULL; | |
55 GrowableArray<HeapWord*>* MarkSweep::_last_gc_live_oops = NULL; | |
56 GrowableArray<HeapWord*>* MarkSweep::_last_gc_live_oops_moved_to = NULL; | |
57 GrowableArray<size_t> * MarkSweep::_last_gc_live_oops_size = NULL; | |
58 #endif | |
59 | |
60 void MarkSweep::revisit_weak_klass_link(Klass* k) { | |
61 _revisit_klass_stack->push(k); | |
62 } | |
63 | |
64 void MarkSweep::follow_weak_klass_links() { | |
65 // All klasses on the revisit stack are marked at this point. | |
66 // Update and follow all subklass, sibling and implementor links. | |
941 | 67 if (PrintRevisitStats) { |
68 gclog_or_tty->print_cr("#classes in system dictionary = %d", SystemDictionary::number_of_classes()); | |
69 gclog_or_tty->print_cr("Revisit klass stack length = %d", _revisit_klass_stack->length()); | |
70 } | |
0 | 71 for (int i = 0; i < _revisit_klass_stack->length(); i++) { |
72 _revisit_klass_stack->at(i)->follow_weak_klass_links(&is_alive,&keep_alive); | |
73 } | |
74 follow_stack(); | |
75 } | |
76 | |
941 | 77 void MarkSweep::revisit_mdo(DataLayout* p) { |
78 _revisit_mdo_stack->push(p); | |
79 } | |
80 | |
81 void MarkSweep::follow_mdo_weak_refs() { | |
82 // All strongly reachable oops have been marked at this point; | |
83 // we can visit and clear any weak references from MDO's which | |
84 // we memoized during the strong marking phase. | |
85 assert(_marking_stack->is_empty(), "Marking stack should be empty"); | |
86 if (PrintRevisitStats) { | |
87 gclog_or_tty->print_cr("#classes in system dictionary = %d", SystemDictionary::number_of_classes()); | |
88 gclog_or_tty->print_cr("Revisit MDO stack length = %d", _revisit_mdo_stack->length()); | |
89 } | |
90 for (int i = 0; i < _revisit_mdo_stack->length(); i++) { | |
91 _revisit_mdo_stack->at(i)->follow_weak_refs(&is_alive); | |
92 } | |
93 follow_stack(); | |
94 } | |
95 | |
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96 MarkSweep::FollowRootClosure MarkSweep::follow_root_closure; |
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97 CodeBlobToOopClosure MarkSweep::follow_code_root_closure(&MarkSweep::follow_root_closure, /*do_marking=*/ true); |
0 | 98 |
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99 void MarkSweep::FollowRootClosure::do_oop(oop* p) { follow_root(p); } |
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100 void MarkSweep::FollowRootClosure::do_oop(narrowOop* p) { follow_root(p); } |
0 | 101 |
102 MarkSweep::MarkAndPushClosure MarkSweep::mark_and_push_closure; | |
103 | |
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104 void MarkSweep::MarkAndPushClosure::do_oop(oop* p) { mark_and_push(p); } |
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105 void MarkSweep::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(p); } |
0 | 106 |
107 void MarkSweep::follow_stack() { | |
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108 do { |
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109 while (!_marking_stack->is_empty()) { |
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110 oop obj = _marking_stack->pop(); |
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111 assert (obj->is_gc_marked(), "p must be marked"); |
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112 obj->follow_contents(); |
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113 } |
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114 // Process ObjArrays one at a time to avoid marking stack bloat. |
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115 if (!_objarray_stack->is_empty()) { |
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116 ObjArrayTask task = _objarray_stack->pop(); |
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117 objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint(); |
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118 k->oop_follow_contents(task.obj(), task.index()); |
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119 } |
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120 } while (!_marking_stack->is_empty() || !_objarray_stack->is_empty()); |
0 | 121 } |
122 | |
123 MarkSweep::FollowStackClosure MarkSweep::follow_stack_closure; | |
124 | |
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125 void MarkSweep::FollowStackClosure::do_void() { follow_stack(); } |
0 | 126 |
127 // We preserve the mark which should be replaced at the end and the location that it | |
128 // will go. Note that the object that this markOop belongs to isn't currently at that | |
129 // address but it will be after phase4 | |
130 void MarkSweep::preserve_mark(oop obj, markOop mark) { | |
131 // we try to store preserved marks in the to space of the new generation since this | |
132 // is storage which should be available. Most of the time this should be sufficient | |
133 // space for the marks we need to preserve but if it isn't we fall back in using | |
134 // GrowableArrays to keep track of the overflow. | |
135 if (_preserved_count < _preserved_count_max) { | |
136 _preserved_marks[_preserved_count++].init(obj, mark); | |
137 } else { | |
138 if (_preserved_mark_stack == NULL) { | |
139 _preserved_mark_stack = new (ResourceObj::C_HEAP) GrowableArray<markOop>(40, true); | |
140 _preserved_oop_stack = new (ResourceObj::C_HEAP) GrowableArray<oop>(40, true); | |
141 } | |
142 _preserved_mark_stack->push(mark); | |
143 _preserved_oop_stack->push(obj); | |
144 } | |
145 } | |
146 | |
147 MarkSweep::AdjustPointerClosure MarkSweep::adjust_root_pointer_closure(true); | |
148 MarkSweep::AdjustPointerClosure MarkSweep::adjust_pointer_closure(false); | |
149 | |
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150 void MarkSweep::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p, _is_root); } |
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151 void MarkSweep::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p, _is_root); } |
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152 |
0 | 153 void MarkSweep::adjust_marks() { |
154 assert(_preserved_oop_stack == NULL || | |
155 _preserved_oop_stack->length() == _preserved_mark_stack->length(), | |
156 "inconsistent preserved oop stacks"); | |
157 | |
158 // adjust the oops we saved earlier | |
159 for (size_t i = 0; i < _preserved_count; i++) { | |
160 _preserved_marks[i].adjust_pointer(); | |
161 } | |
162 | |
163 // deal with the overflow stack | |
164 if (_preserved_oop_stack) { | |
165 for (int i = 0; i < _preserved_oop_stack->length(); i++) { | |
166 oop* p = _preserved_oop_stack->adr_at(i); | |
167 adjust_pointer(p); | |
168 } | |
169 } | |
170 } | |
171 | |
172 void MarkSweep::restore_marks() { | |
173 assert(_preserved_oop_stack == NULL || | |
174 _preserved_oop_stack->length() == _preserved_mark_stack->length(), | |
175 "inconsistent preserved oop stacks"); | |
176 if (PrintGC && Verbose) { | |
177 gclog_or_tty->print_cr("Restoring %d marks", _preserved_count + | |
178 (_preserved_oop_stack ? _preserved_oop_stack->length() : 0)); | |
179 } | |
180 | |
181 // restore the marks we saved earlier | |
182 for (size_t i = 0; i < _preserved_count; i++) { | |
183 _preserved_marks[i].restore(); | |
184 } | |
185 | |
186 // deal with the overflow | |
187 if (_preserved_oop_stack) { | |
188 for (int i = 0; i < _preserved_oop_stack->length(); i++) { | |
189 oop obj = _preserved_oop_stack->at(i); | |
190 markOop mark = _preserved_mark_stack->at(i); | |
191 obj->set_mark(mark); | |
192 } | |
193 } | |
194 } | |
195 | |
196 #ifdef VALIDATE_MARK_SWEEP | |
197 | |
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198 void MarkSweep::track_adjusted_pointer(void* p, bool isroot) { |
0 | 199 if (!ValidateMarkSweep) |
200 return; | |
201 | |
202 if (!isroot) { | |
203 if (_pointer_tracking) { | |
204 guarantee(_adjusted_pointers->contains(p), "should have seen this pointer"); | |
205 _adjusted_pointers->remove(p); | |
206 } | |
207 } else { | |
208 ptrdiff_t index = _root_refs_stack->find(p); | |
209 if (index != -1) { | |
210 int l = _root_refs_stack->length(); | |
211 if (l > 0 && l - 1 != index) { | |
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212 void* last = _root_refs_stack->pop(); |
0 | 213 assert(last != p, "should be different"); |
214 _root_refs_stack->at_put(index, last); | |
215 } else { | |
216 _root_refs_stack->remove(p); | |
217 } | |
218 } | |
219 } | |
220 } | |
221 | |
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222 void MarkSweep::check_adjust_pointer(void* p) { |
0 | 223 _adjusted_pointers->push(p); |
224 } | |
225 | |
226 class AdjusterTracker: public OopClosure { | |
227 public: | |
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228 AdjusterTracker() {} |
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229 void do_oop(oop* o) { MarkSweep::check_adjust_pointer(o); } |
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230 void do_oop(narrowOop* o) { MarkSweep::check_adjust_pointer(o); } |
0 | 231 }; |
232 | |
233 void MarkSweep::track_interior_pointers(oop obj) { | |
234 if (ValidateMarkSweep) { | |
235 _adjusted_pointers->clear(); | |
236 _pointer_tracking = true; | |
237 | |
238 AdjusterTracker checker; | |
239 obj->oop_iterate(&checker); | |
240 } | |
241 } | |
242 | |
243 void MarkSweep::check_interior_pointers() { | |
244 if (ValidateMarkSweep) { | |
245 _pointer_tracking = false; | |
246 guarantee(_adjusted_pointers->length() == 0, "should have processed the same pointers"); | |
247 } | |
248 } | |
249 | |
250 void MarkSweep::reset_live_oop_tracking(bool at_perm) { | |
251 if (ValidateMarkSweep) { | |
252 guarantee((size_t)_live_oops->length() == _live_oops_index, "should be at end of live oops"); | |
253 _live_oops_index = at_perm ? _live_oops_index_at_perm : 0; | |
254 } | |
255 } | |
256 | |
257 void MarkSweep::register_live_oop(oop p, size_t size) { | |
258 if (ValidateMarkSweep) { | |
259 _live_oops->push(p); | |
260 _live_oops_size->push(size); | |
261 _live_oops_index++; | |
262 } | |
263 } | |
264 | |
265 void MarkSweep::validate_live_oop(oop p, size_t size) { | |
266 if (ValidateMarkSweep) { | |
267 oop obj = _live_oops->at((int)_live_oops_index); | |
268 guarantee(obj == p, "should be the same object"); | |
269 guarantee(_live_oops_size->at((int)_live_oops_index) == size, "should be the same size"); | |
270 _live_oops_index++; | |
271 } | |
272 } | |
273 | |
274 void MarkSweep::live_oop_moved_to(HeapWord* q, size_t size, | |
275 HeapWord* compaction_top) { | |
276 assert(oop(q)->forwardee() == NULL || oop(q)->forwardee() == oop(compaction_top), | |
277 "should be moved to forwarded location"); | |
278 if (ValidateMarkSweep) { | |
279 MarkSweep::validate_live_oop(oop(q), size); | |
280 _live_oops_moved_to->push(oop(compaction_top)); | |
281 } | |
282 if (RecordMarkSweepCompaction) { | |
283 _cur_gc_live_oops->push(q); | |
284 _cur_gc_live_oops_moved_to->push(compaction_top); | |
285 _cur_gc_live_oops_size->push(size); | |
286 } | |
287 } | |
288 | |
289 void MarkSweep::compaction_complete() { | |
290 if (RecordMarkSweepCompaction) { | |
291 GrowableArray<HeapWord*>* _tmp_live_oops = _cur_gc_live_oops; | |
292 GrowableArray<HeapWord*>* _tmp_live_oops_moved_to = _cur_gc_live_oops_moved_to; | |
293 GrowableArray<size_t> * _tmp_live_oops_size = _cur_gc_live_oops_size; | |
294 | |
295 _cur_gc_live_oops = _last_gc_live_oops; | |
296 _cur_gc_live_oops_moved_to = _last_gc_live_oops_moved_to; | |
297 _cur_gc_live_oops_size = _last_gc_live_oops_size; | |
298 _last_gc_live_oops = _tmp_live_oops; | |
299 _last_gc_live_oops_moved_to = _tmp_live_oops_moved_to; | |
300 _last_gc_live_oops_size = _tmp_live_oops_size; | |
301 } | |
302 } | |
303 | |
304 void MarkSweep::print_new_location_of_heap_address(HeapWord* q) { | |
305 if (!RecordMarkSweepCompaction) { | |
306 tty->print_cr("Requires RecordMarkSweepCompaction to be enabled"); | |
307 return; | |
308 } | |
309 | |
310 if (_last_gc_live_oops == NULL) { | |
311 tty->print_cr("No compaction information gathered yet"); | |
312 return; | |
313 } | |
314 | |
315 for (int i = 0; i < _last_gc_live_oops->length(); i++) { | |
316 HeapWord* old_oop = _last_gc_live_oops->at(i); | |
317 size_t sz = _last_gc_live_oops_size->at(i); | |
318 if (old_oop <= q && q < (old_oop + sz)) { | |
319 HeapWord* new_oop = _last_gc_live_oops_moved_to->at(i); | |
320 size_t offset = (q - old_oop); | |
321 tty->print_cr("Address " PTR_FORMAT, q); | |
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322 tty->print_cr(" Was in oop " PTR_FORMAT ", size " SIZE_FORMAT ", at offset " SIZE_FORMAT, old_oop, sz, offset); |
0 | 323 tty->print_cr(" Now in oop " PTR_FORMAT ", actual address " PTR_FORMAT, new_oop, new_oop + offset); |
324 return; | |
325 } | |
326 } | |
327 | |
328 tty->print_cr("Address " PTR_FORMAT " not found in live oop information from last GC", q); | |
329 } | |
330 #endif //VALIDATE_MARK_SWEEP | |
331 | |
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332 MarkSweep::IsAliveClosure MarkSweep::is_alive; |
0 | 333 |
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334 void MarkSweep::IsAliveClosure::do_object(oop p) { ShouldNotReachHere(); } |
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335 bool MarkSweep::IsAliveClosure::do_object_b(oop p) { return p->is_gc_marked(); } |
0 | 336 |
337 MarkSweep::KeepAliveClosure MarkSweep::keep_alive; | |
338 | |
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339 void MarkSweep::KeepAliveClosure::do_oop(oop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } |
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340 void MarkSweep::KeepAliveClosure::do_oop(narrowOop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } |
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341 |
0 | 342 void marksweep_init() { /* empty */ } |
343 | |
344 #ifndef PRODUCT | |
345 | |
346 void MarkSweep::trace(const char* msg) { | |
347 if (TraceMarkSweep) | |
348 gclog_or_tty->print("%s", msg); | |
349 } | |
350 | |
351 #endif |