Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 14486:4f227ecd7beb
8035326: Assume non-NULL references in G1CollectedHeap::in_cset_fast_test
Summary: Remove the assumption that G1CollectedHeap::in_cset_fast_test needs to check for NULL references. Most of the time this is not required, making the code doing this check multiple times.
Reviewed-by: stefank, mgerdin, jmasa
author | tschatzl |
---|---|
date | Mon, 24 Feb 2014 09:40:49 +0100 |
parents | 10c424c5a362 |
children | 4ca6dc0799b6 |
rev | line source |
---|---|
342 | 1 /* |
10405 | 2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1387
diff
changeset
|
21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "classfile/symbolTable.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/codeCache.hpp" | |
31 #include "code/icBuffer.hpp" | |
6007
5c86f8211d1e
7160728: Introduce an extra logging level for G1 logging
brutisso
parents:
4872
diff
changeset
|
32 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 33 #include "gc_implementation/g1/g1MarkSweep.hpp" |
10405 | 34 #include "gc_implementation/shared/gcHeapSummary.hpp" |
35 #include "gc_implementation/shared/gcTimer.hpp" | |
36 #include "gc_implementation/shared/gcTrace.hpp" | |
37 #include "gc_implementation/shared/gcTraceTime.hpp" | |
1972 | 38 #include "memory/gcLocker.hpp" |
39 #include "memory/genCollectedHeap.hpp" | |
40 #include "memory/modRefBarrierSet.hpp" | |
41 #include "memory/referencePolicy.hpp" | |
42 #include "memory/space.hpp" | |
43 #include "oops/instanceRefKlass.hpp" | |
44 #include "oops/oop.inline.hpp" | |
45 #include "prims/jvmtiExport.hpp" | |
46 #include "runtime/biasedLocking.hpp" | |
47 #include "runtime/fprofiler.hpp" | |
48 #include "runtime/synchronizer.hpp" | |
49 #include "runtime/thread.hpp" | |
50 #include "runtime/vmThread.hpp" | |
51 #include "utilities/copy.hpp" | |
52 #include "utilities/events.hpp" | |
342 | 53 |
54 class HeapRegion; | |
55 | |
56 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
57 bool clear_all_softrefs) { | |
58 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
59 | |
1387
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
60 SharedHeap* sh = SharedHeap::heap(); |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
61 #ifdef ASSERT |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
62 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
63 assert(clear_all_softrefs, "Policy should have been checked earler"); |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
64 } |
0bfd3fb24150
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
1311
diff
changeset
|
65 #endif |
342 | 66 // hook up weak ref data so it can be used during Mark-Sweep |
67 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
68 assert(rp != NULL, "should be non-NULL"); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3772
diff
changeset
|
69 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3772
diff
changeset
|
70 |
342 | 71 GenMarkSweep::_ref_processor = rp; |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
72 rp->setup_policy(clear_all_softrefs); |
342 | 73 |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
74 // When collecting the permanent generation Method*s may be moving, |
342 | 75 // so we either have to flush all bcp data or convert it into bci. |
76 CodeCache::gc_prologue(); | |
77 Threads::gc_prologue(); | |
78 | |
79 bool marked_for_unloading = false; | |
80 | |
81 allocate_stacks(); | |
82 | |
358
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
83 // We should save the marks of the currently locked biased monitors. |
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
84 // The marking doesn't preserve the marks of biased objects. |
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
85 BiasedLocking::preserve_marks(); |
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
86 |
342 | 87 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
88 | |
89 mark_sweep_phase2(); | |
90 | |
91 // Don't add any more derived pointers during phase3 | |
92 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
93 | |
94 mark_sweep_phase3(); | |
95 | |
96 mark_sweep_phase4(); | |
97 | |
98 GenMarkSweep::restore_marks(); | |
358
8651a65ac4b4
6735416: G1: runThese javasoft.sqe.tests.lang.thrd011.thrd01101.thrd01101 fails
iveresov
parents:
342
diff
changeset
|
99 BiasedLocking::restore_marks(); |
342 | 100 GenMarkSweep::deallocate_stacks(); |
101 | |
102 // "free at last gc" is calculated from these. | |
103 // CHF: cheating for now!!! | |
104 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
105 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
106 | |
107 Threads::gc_epilogue(); | |
108 CodeCache::gc_epilogue(); | |
2147
9afee0b9fc1d
7012505: BreakpointWithFullGC.sh fails with Internal Error (src/share/vm/oops/methodOop.cpp:220)
kamg
parents:
1972
diff
changeset
|
109 JvmtiExport::gc_epilogue(); |
342 | 110 |
111 // refs processing: clean slate | |
112 GenMarkSweep::_ref_processor = NULL; | |
113 } | |
114 | |
115 | |
116 void G1MarkSweep::allocate_stacks() { | |
117 GenMarkSweep::_preserved_count_max = 0; | |
118 GenMarkSweep::_preserved_marks = NULL; | |
119 GenMarkSweep::_preserved_count = 0; | |
120 } | |
121 | |
122 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
123 bool clear_all_softrefs) { | |
124 // Recursively traverse all live objects and mark them | |
10405 | 125 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer()); |
342 | 126 GenMarkSweep::trace(" 1"); |
127 | |
128 SharedHeap* sh = SharedHeap::heap(); | |
129 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
130 // Need cleared claim bits for the strong roots processing |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
131 ClassLoaderDataGraph::clear_claimed_marks(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
132 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
133 sh->process_strong_roots(true, // activate StrongRootsScope |
342 | 134 SharedHeap::SO_SystemClasses, |
135 &GenMarkSweep::follow_root_closure, | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
136 &GenMarkSweep::follow_klass_closure); |
342 | 137 |
138 // Process reference objects found during marking | |
453
c96030fff130
6684579: SoftReference processing can be made more efficient
ysr
parents:
358
diff
changeset
|
139 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3772
diff
changeset
|
140 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity"); |
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3772
diff
changeset
|
141 |
457
27a80744a83b
6778647: snap(), snap_policy() should be renamed setup(), setup_policy()
ysr
parents:
453
diff
changeset
|
142 rp->setup_policy(clear_all_softrefs); |
10405 | 143 const ReferenceProcessorStats& stats = |
144 rp->process_discovered_references(&GenMarkSweep::is_alive, | |
145 &GenMarkSweep::keep_alive, | |
146 &GenMarkSweep::follow_stack_closure, | |
147 NULL, | |
148 gc_timer()); | |
149 gc_tracer()->report_gc_reference_stats(stats); | |
342 | 150 |
10188
2f50bc369470
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
10186
diff
changeset
|
151 |
2f50bc369470
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
10186
diff
changeset
|
152 // This is the point where the entire marking should have completed. |
2f50bc369470
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
10186
diff
changeset
|
153 assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed"); |
2f50bc369470
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
10186
diff
changeset
|
154 |
2f50bc369470
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
10186
diff
changeset
|
155 // Unload classes and purge the SystemDictionary. |
342 | 156 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); |
157 | |
10188
2f50bc369470
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
10186
diff
changeset
|
158 // Unload nmethods. |
6787
8966c2d65d96
7200470: KeepAliveClosure not needed in CodeCache::do_unloading
brutisso
parents:
6725
diff
changeset
|
159 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class); |
342 | 160 |
10188
2f50bc369470
8013160: NPG: Remove unnecessary mark stack draining after CodeCache::do_unloading
stefank
parents:
10186
diff
changeset
|
161 // Prune dead klasses from subklass/sibling/implementor lists. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
162 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive); |
342 | 163 |
14303
893ce66f7473
8027476: Improve performance of Stringtable unlink
tschatzl
parents:
12343
diff
changeset
|
164 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table. |
893ce66f7473
8027476: Improve performance of Stringtable unlink
tschatzl
parents:
12343
diff
changeset
|
165 G1CollectedHeap::heap()->unlink_string_and_symbol_table(&GenMarkSweep::is_alive); |
342 | 166 |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
167 if (VerifyDuringGC) { |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
168 HandleMark hm; // handle scope |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
169 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
170 Universe::heap()->prepare_for_verify(); |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
171 // Note: we can verify only the heap here. When an object is |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
172 // marked, the previous value of the mark word (including |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
173 // identity hash values, ages, etc) is preserved, and the mark |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
174 // word is set to markOop::marked_value - effectively removing |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
175 // any hash values from the mark word. These hash values are |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
176 // used when verifying the dictionaries and so removing them |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
177 // from the mark word can make verification of the dictionaries |
14309 | 178 // fail. At the end of the GC, the original mark word values |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
179 // (including hash values) are restored to the appropriate |
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
180 // objects. |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10179
diff
changeset
|
181 if (!VerifySilently) { |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10179
diff
changeset
|
182 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10179
diff
changeset
|
183 } |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10179
diff
changeset
|
184 Universe::heap()->verify(VerifySilently, VerifyOption_G1UseMarkWord); |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10179
diff
changeset
|
185 if (!VerifySilently) { |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10179
diff
changeset
|
186 gclog_or_tty->print_cr("]"); |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
10179
diff
changeset
|
187 } |
3772
6747fd0512e0
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
2361
diff
changeset
|
188 } |
10405 | 189 |
190 gc_tracer()->report_object_count_after_gc(&GenMarkSweep::is_alive); | |
342 | 191 } |
192 | |
193 class G1PrepareCompactClosure: public HeapRegionClosure { | |
2152 | 194 G1CollectedHeap* _g1h; |
342 | 195 ModRefBarrierSet* _mrbs; |
196 CompactPoint _cp; | |
2152 | 197 HumongousRegionSet _humongous_proxy_set; |
342 | 198 |
199 void free_humongous_region(HeapRegion* hr) { | |
200 HeapWord* end = hr->end(); | |
2361 | 201 size_t dummy_pre_used; |
202 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); | |
203 | |
342 | 204 assert(hr->startsHumongous(), |
205 "Only the start of a humongous region should be freed."); | |
2361 | 206 _g1h->free_humongous_region(hr, &dummy_pre_used, &dummy_free_list, |
2152 | 207 &_humongous_proxy_set, false /* par */); |
342 | 208 hr->prepare_for_compaction(&_cp); |
209 // Also clear the part of the card table that will be unused after | |
210 // compaction. | |
2152 | 211 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
2361 | 212 dummy_free_list.remove_all(); |
342 | 213 } |
214 | |
215 public: | |
2152 | 216 G1PrepareCompactClosure(CompactibleSpace* cs) |
217 : _g1h(G1CollectedHeap::heap()), | |
12343 | 218 _mrbs(_g1h->g1_barrier_set()), |
342 | 219 _cp(NULL, cs, cs->initialize_threshold()), |
2152 | 220 _humongous_proxy_set("G1MarkSweep Humongous Proxy Set") { } |
221 | |
222 void update_sets() { | |
223 // We'll recalculate total used bytes and recreate the free list | |
224 // at the end of the GC, so no point in updating those values here. | |
225 _g1h->update_sets_after_freeing_regions(0, /* pre_used */ | |
226 NULL, /* free_list */ | |
4072 | 227 NULL, /* old_proxy_set */ |
2152 | 228 &_humongous_proxy_set, |
229 false /* par */); | |
230 } | |
231 | |
342 | 232 bool doHeapRegion(HeapRegion* hr) { |
233 if (hr->isHumongous()) { | |
234 if (hr->startsHumongous()) { | |
235 oop obj = oop(hr->bottom()); | |
236 if (obj->is_gc_marked()) { | |
237 obj->forward_to(obj); | |
238 } else { | |
239 free_humongous_region(hr); | |
240 } | |
241 } else { | |
242 assert(hr->continuesHumongous(), "Invalid humongous."); | |
243 } | |
244 } else { | |
245 hr->prepare_for_compaction(&_cp); | |
246 // Also clear the part of the card table that will be unused after | |
247 // compaction. | |
248 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
249 } | |
250 return false; | |
251 } | |
252 }; | |
677 | 253 |
342 | 254 void G1MarkSweep::mark_sweep_phase2() { |
255 // Now all live objects are marked, compute the new object addresses. | |
256 | |
257 // It is not required that we traverse spaces in the same order in | |
258 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
259 // tracking expects us to do so. See comment under phase4. | |
260 | |
261 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
262 | |
10405 | 263 GCTraceTime tm("phase 2", G1Log::fine() && Verbose, true, gc_timer()); |
342 | 264 GenMarkSweep::trace("2"); |
265 | |
6254
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6008
diff
changeset
|
266 // find the first region |
a2f7274eb6ef
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
6008
diff
changeset
|
267 HeapRegion* r = g1h->region_at(0); |
342 | 268 CompactibleSpace* sp = r; |
269 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
270 sp = r->next_compaction_space(); | |
271 } | |
272 | |
677 | 273 G1PrepareCompactClosure blk(sp); |
342 | 274 g1h->heap_region_iterate(&blk); |
2152 | 275 blk.update_sets(); |
342 | 276 } |
277 | |
278 class G1AdjustPointersClosure: public HeapRegionClosure { | |
279 public: | |
280 bool doHeapRegion(HeapRegion* r) { | |
281 if (r->isHumongous()) { | |
282 if (r->startsHumongous()) { | |
283 // We must adjust the pointers on the single H object. | |
284 oop obj = oop(r->bottom()); | |
285 // point all the oops to the new location | |
286 obj->adjust_pointers(); | |
287 } | |
288 } else { | |
289 // This really ought to be "as_CompactibleSpace"... | |
290 r->adjust_pointers(); | |
291 } | |
292 return false; | |
293 } | |
294 }; | |
295 | |
296 void G1MarkSweep::mark_sweep_phase3() { | |
297 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
298 | |
299 // Adjust the pointers to reflect the new locations | |
10405 | 300 GCTraceTime tm("phase 3", G1Log::fine() && Verbose, true, gc_timer()); |
342 | 301 GenMarkSweep::trace("3"); |
302 | |
303 SharedHeap* sh = SharedHeap::heap(); | |
304 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
305 // Need cleared claim bits for the strong roots processing |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
306 ClassLoaderDataGraph::clear_claimed_marks(); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
307 |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
308 sh->process_strong_roots(true, // activate StrongRootsScope |
14467
10c424c5a362
8034764: Use process_strong_roots to adjust the StringTable
stefank
parents:
14466
diff
changeset
|
309 SharedHeap::SO_AllClasses | SharedHeap::SO_Strings | SharedHeap::SO_AllCodeCache, |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7448
diff
changeset
|
310 &GenMarkSweep::adjust_pointer_closure, |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
311 &GenMarkSweep::adjust_klass_closure); |
342 | 312 |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3772
diff
changeset
|
313 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
10179
a08c80e9e1e5
8012687: Remove unused is_root checks and closures
stefank
parents:
7448
diff
changeset
|
314 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_pointer_closure); |
342 | 315 |
316 // Now adjust pointers in remaining weak roots. (All of which should | |
317 // have been cleared if they pointed to non-surviving objects.) | |
14466
d166675568f6
8034761: Remove the do_code_roots parameter from process_strong_roots
stefank
parents:
14309
diff
changeset
|
318 sh->process_weak_roots(&GenMarkSweep::adjust_pointer_closure); |
342 | 319 |
320 GenMarkSweep::adjust_marks(); | |
321 | |
322 G1AdjustPointersClosure blk; | |
323 g1h->heap_region_iterate(&blk); | |
324 } | |
325 | |
326 class G1SpaceCompactClosure: public HeapRegionClosure { | |
327 public: | |
328 G1SpaceCompactClosure() {} | |
329 | |
330 bool doHeapRegion(HeapRegion* hr) { | |
331 if (hr->isHumongous()) { | |
332 if (hr->startsHumongous()) { | |
333 oop obj = oop(hr->bottom()); | |
334 if (obj->is_gc_marked()) { | |
335 obj->init_mark(); | |
336 } else { | |
337 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
338 } | |
339 hr->reset_during_compaction(); | |
340 } | |
341 } else { | |
342 hr->compact(); | |
343 } | |
344 return false; | |
345 } | |
346 }; | |
347 | |
348 void G1MarkSweep::mark_sweep_phase4() { | |
349 // All pointers are now adjusted, move objects accordingly | |
350 | |
351 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
352 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6254
diff
changeset
|
353 // here (code and comment not fixed for perm removal), so we tell the validate code |
342 | 354 // to use a higher index (saved from phase2) when verifying perm_gen. |
355 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
356 | |
10405 | 357 GCTraceTime tm("phase 4", G1Log::fine() && Verbose, true, gc_timer()); |
342 | 358 GenMarkSweep::trace("4"); |
359 | |
360 G1SpaceCompactClosure blk; | |
361 g1h->heap_region_iterate(&blk); | |
362 | |
363 } |