Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 6615:09aad8452938
7190310: Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops
Summary: In C2 add software membar after load from Reference.referent field to prevent commoning of loads across safepoint since GC can change its value. In C1 always generate Reference.get() intrinsic.
Reviewed-by: roland, twisti, dholmes, johnc
author | kvn |
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date | Mon, 20 Aug 2012 09:58:58 -0700 |
parents | a2f7274eb6ef |
children | da91efe96a93 |
rev | line source |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 * | |
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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. |
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" | |
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32 #include "gc_implementation/g1/g1Log.hpp" |
1972 | 33 #include "gc_implementation/g1/g1MarkSweep.hpp" |
34 #include "memory/gcLocker.hpp" | |
35 #include "memory/genCollectedHeap.hpp" | |
36 #include "memory/modRefBarrierSet.hpp" | |
37 #include "memory/referencePolicy.hpp" | |
38 #include "memory/space.hpp" | |
39 #include "oops/instanceRefKlass.hpp" | |
40 #include "oops/oop.inline.hpp" | |
41 #include "prims/jvmtiExport.hpp" | |
42 #include "runtime/aprofiler.hpp" | |
43 #include "runtime/biasedLocking.hpp" | |
44 #include "runtime/fprofiler.hpp" | |
45 #include "runtime/synchronizer.hpp" | |
46 #include "runtime/thread.hpp" | |
47 #include "runtime/vmThread.hpp" | |
48 #include "utilities/copy.hpp" | |
49 #include "utilities/events.hpp" | |
342 | 50 |
51 class HeapRegion; | |
52 | |
53 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
54 bool clear_all_softrefs) { | |
55 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
56 | |
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57 SharedHeap* sh = SharedHeap::heap(); |
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58 #ifdef ASSERT |
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59 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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60 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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61 } |
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62 #endif |
342 | 63 // hook up weak ref data so it can be used during Mark-Sweep |
64 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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65 assert(rp != NULL, "should be non-NULL"); |
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66 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition"); |
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67 |
342 | 68 GenMarkSweep::_ref_processor = rp; |
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69 rp->setup_policy(clear_all_softrefs); |
342 | 70 |
71 // When collecting the permanent generation methodOops may be moving, | |
72 // so we either have to flush all bcp data or convert it into bci. | |
73 CodeCache::gc_prologue(); | |
74 Threads::gc_prologue(); | |
75 | |
76 // Increment the invocation count for the permanent generation, since it is | |
77 // implicitly collected whenever we do a full mark sweep collection. | |
78 sh->perm_gen()->stat_record()->invocations++; | |
79 | |
80 bool marked_for_unloading = false; | |
81 | |
82 allocate_stacks(); | |
83 | |
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84 // We should save the marks of the currently locked biased monitors. |
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85 // The marking doesn't preserve the marks of biased objects. |
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86 BiasedLocking::preserve_marks(); |
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87 |
342 | 88 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
89 | |
90 mark_sweep_phase2(); | |
91 | |
92 // Don't add any more derived pointers during phase3 | |
93 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
94 | |
95 mark_sweep_phase3(); | |
96 | |
97 mark_sweep_phase4(); | |
98 | |
99 GenMarkSweep::restore_marks(); | |
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100 BiasedLocking::restore_marks(); |
342 | 101 GenMarkSweep::deallocate_stacks(); |
102 | |
103 // We must invalidate the perm-gen rs, so that it gets rebuilt. | |
104 GenRemSet* rs = sh->rem_set(); | |
105 rs->invalidate(sh->perm_gen()->used_region(), true /*whole_heap*/); | |
106 | |
107 // "free at last gc" is calculated from these. | |
108 // CHF: cheating for now!!! | |
109 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
110 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
111 | |
112 Threads::gc_epilogue(); | |
113 CodeCache::gc_epilogue(); | |
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114 JvmtiExport::gc_epilogue(); |
342 | 115 |
116 // refs processing: clean slate | |
117 GenMarkSweep::_ref_processor = NULL; | |
118 } | |
119 | |
120 | |
121 void G1MarkSweep::allocate_stacks() { | |
122 GenMarkSweep::_preserved_count_max = 0; | |
123 GenMarkSweep::_preserved_marks = NULL; | |
124 GenMarkSweep::_preserved_count = 0; | |
125 } | |
126 | |
127 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
128 bool clear_all_softrefs) { | |
129 // Recursively traverse all live objects and mark them | |
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130 TraceTime tm("phase 1", G1Log::fine() && Verbose, true, gclog_or_tty); |
342 | 131 GenMarkSweep::trace(" 1"); |
132 | |
133 SharedHeap* sh = SharedHeap::heap(); | |
134 | |
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135 sh->process_strong_roots(true, // activeate StrongRootsScope |
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136 true, // Collecting permanent generation. |
342 | 137 SharedHeap::SO_SystemClasses, |
138 &GenMarkSweep::follow_root_closure, | |
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139 &GenMarkSweep::follow_code_root_closure, |
342 | 140 &GenMarkSweep::follow_root_closure); |
141 | |
142 // Process reference objects found during marking | |
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143 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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144 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Sanity"); |
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145 |
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146 rp->setup_policy(clear_all_softrefs); |
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147 rp->process_discovered_references(&GenMarkSweep::is_alive, |
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148 &GenMarkSweep::keep_alive, |
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149 &GenMarkSweep::follow_stack_closure, |
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150 NULL); |
342 | 151 |
152 // Follow system dictionary roots and unload classes | |
153 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); | |
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154 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 155 "stack should be empty by now"); |
156 | |
157 // Follow code cache roots (has to be done after system dictionary, | |
158 // assumes all live klasses are marked) | |
159 CodeCache::do_unloading(&GenMarkSweep::is_alive, | |
160 &GenMarkSweep::keep_alive, | |
161 purged_class); | |
941 | 162 GenMarkSweep::follow_stack(); |
342 | 163 |
164 // Update subklass/sibling/implementor links of live klasses | |
165 GenMarkSweep::follow_weak_klass_links(); | |
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166 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 167 "stack should be empty by now"); |
168 | |
941 | 169 // Visit memoized MDO's and clear any unmarked weak refs |
170 GenMarkSweep::follow_mdo_weak_refs(); | |
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171 assert(GenMarkSweep::_marking_stack.is_empty(), "just drained"); |
941 | 172 |
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173 // Visit interned string tables and delete unmarked oops |
342 | 174 StringTable::unlink(&GenMarkSweep::is_alive); |
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175 // Clean up unreferenced symbols in symbol table. |
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176 SymbolTable::unlink(); |
342 | 177 |
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178 assert(GenMarkSweep::_marking_stack.is_empty(), |
342 | 179 "stack should be empty by now"); |
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180 |
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181 if (VerifyDuringGC) { |
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182 HandleMark hm; // handle scope |
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183 COMPILER2_PRESENT(DerivedPointerTableDeactivate dpt_deact); |
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184 gclog_or_tty->print(" VerifyDuringGC:(full)[Verifying "); |
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185 Universe::heap()->prepare_for_verify(); |
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186 // Note: we can verify only the heap here. When an object is |
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187 // marked, the previous value of the mark word (including |
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188 // identity hash values, ages, etc) is preserved, and the mark |
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189 // word is set to markOop::marked_value - effectively removing |
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190 // any hash values from the mark word. These hash values are |
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191 // used when verifying the dictionaries and so removing them |
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192 // from the mark word can make verification of the dictionaries |
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193 // fail. At the end of the GC, the orginal mark word values |
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194 // (including hash values) are restored to the appropriate |
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195 // objects. |
6008 | 196 Universe::heap()->verify(/* silent */ false, |
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197 /* option */ VerifyOption_G1UseMarkWord); |
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198 |
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199 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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200 gclog_or_tty->print_cr("]"); |
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201 } |
342 | 202 } |
203 | |
204 class G1PrepareCompactClosure: public HeapRegionClosure { | |
2152 | 205 G1CollectedHeap* _g1h; |
342 | 206 ModRefBarrierSet* _mrbs; |
207 CompactPoint _cp; | |
2152 | 208 HumongousRegionSet _humongous_proxy_set; |
342 | 209 |
210 void free_humongous_region(HeapRegion* hr) { | |
211 HeapWord* end = hr->end(); | |
2361 | 212 size_t dummy_pre_used; |
213 FreeRegionList dummy_free_list("Dummy Free List for G1MarkSweep"); | |
214 | |
342 | 215 assert(hr->startsHumongous(), |
216 "Only the start of a humongous region should be freed."); | |
2361 | 217 _g1h->free_humongous_region(hr, &dummy_pre_used, &dummy_free_list, |
2152 | 218 &_humongous_proxy_set, false /* par */); |
342 | 219 hr->prepare_for_compaction(&_cp); |
220 // Also clear the part of the card table that will be unused after | |
221 // compaction. | |
2152 | 222 _mrbs->clear(MemRegion(hr->compaction_top(), end)); |
2361 | 223 dummy_free_list.remove_all(); |
342 | 224 } |
225 | |
226 public: | |
2152 | 227 G1PrepareCompactClosure(CompactibleSpace* cs) |
228 : _g1h(G1CollectedHeap::heap()), | |
229 _mrbs(G1CollectedHeap::heap()->mr_bs()), | |
342 | 230 _cp(NULL, cs, cs->initialize_threshold()), |
2152 | 231 _humongous_proxy_set("G1MarkSweep Humongous Proxy Set") { } |
232 | |
233 void update_sets() { | |
234 // We'll recalculate total used bytes and recreate the free list | |
235 // at the end of the GC, so no point in updating those values here. | |
236 _g1h->update_sets_after_freeing_regions(0, /* pre_used */ | |
237 NULL, /* free_list */ | |
4072 | 238 NULL, /* old_proxy_set */ |
2152 | 239 &_humongous_proxy_set, |
240 false /* par */); | |
241 } | |
242 | |
342 | 243 bool doHeapRegion(HeapRegion* hr) { |
244 if (hr->isHumongous()) { | |
245 if (hr->startsHumongous()) { | |
246 oop obj = oop(hr->bottom()); | |
247 if (obj->is_gc_marked()) { | |
248 obj->forward_to(obj); | |
249 } else { | |
250 free_humongous_region(hr); | |
251 } | |
252 } else { | |
253 assert(hr->continuesHumongous(), "Invalid humongous."); | |
254 } | |
255 } else { | |
256 hr->prepare_for_compaction(&_cp); | |
257 // Also clear the part of the card table that will be unused after | |
258 // compaction. | |
259 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
260 } | |
261 return false; | |
262 } | |
263 }; | |
677 | 264 |
342 | 265 void G1MarkSweep::mark_sweep_phase2() { |
266 // Now all live objects are marked, compute the new object addresses. | |
267 | |
268 // It is imperative that we traverse perm_gen LAST. If dead space is | |
269 // allowed a range of dead object may get overwritten by a dead int | |
270 // array. If perm_gen is not traversed last a klassOop may get | |
271 // overwritten. This is fine since it is dead, but if the class has dead | |
272 // instances we have to skip them, and in order to find their size we | |
273 // need the klassOop! | |
274 // | |
275 // It is not required that we traverse spaces in the same order in | |
276 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
277 // tracking expects us to do so. See comment under phase4. | |
278 | |
279 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
280 Generation* pg = g1h->perm_gen(); | |
281 | |
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282 TraceTime tm("phase 2", G1Log::fine() && Verbose, true, gclog_or_tty); |
342 | 283 GenMarkSweep::trace("2"); |
284 | |
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285 // find the first region |
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286 HeapRegion* r = g1h->region_at(0); |
342 | 287 CompactibleSpace* sp = r; |
288 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
289 sp = r->next_compaction_space(); | |
290 } | |
291 | |
677 | 292 G1PrepareCompactClosure blk(sp); |
342 | 293 g1h->heap_region_iterate(&blk); |
2152 | 294 blk.update_sets(); |
342 | 295 |
296 CompactPoint perm_cp(pg, NULL, NULL); | |
297 pg->prepare_for_compaction(&perm_cp); | |
298 } | |
299 | |
300 class G1AdjustPointersClosure: public HeapRegionClosure { | |
301 public: | |
302 bool doHeapRegion(HeapRegion* r) { | |
303 if (r->isHumongous()) { | |
304 if (r->startsHumongous()) { | |
305 // We must adjust the pointers on the single H object. | |
306 oop obj = oop(r->bottom()); | |
307 debug_only(GenMarkSweep::track_interior_pointers(obj)); | |
308 // point all the oops to the new location | |
309 obj->adjust_pointers(); | |
310 debug_only(GenMarkSweep::check_interior_pointers()); | |
311 } | |
312 } else { | |
313 // This really ought to be "as_CompactibleSpace"... | |
314 r->adjust_pointers(); | |
315 } | |
316 return false; | |
317 } | |
318 }; | |
319 | |
320 void G1MarkSweep::mark_sweep_phase3() { | |
321 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
322 Generation* pg = g1h->perm_gen(); | |
323 | |
324 // Adjust the pointers to reflect the new locations | |
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325 TraceTime tm("phase 3", G1Log::fine() && Verbose, true, gclog_or_tty); |
342 | 326 GenMarkSweep::trace("3"); |
327 | |
328 SharedHeap* sh = SharedHeap::heap(); | |
329 | |
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330 sh->process_strong_roots(true, // activate StrongRootsScope |
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331 true, // Collecting permanent generation. |
342 | 332 SharedHeap::SO_AllClasses, |
333 &GenMarkSweep::adjust_root_pointer_closure, | |
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334 NULL, // do not touch code cache here |
342 | 335 &GenMarkSweep::adjust_pointer_closure); |
336 | |
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337 assert(GenMarkSweep::ref_processor() == g1h->ref_processor_stw(), "Sanity"); |
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338 g1h->ref_processor_stw()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure); |
342 | 339 |
340 // Now adjust pointers in remaining weak roots. (All of which should | |
341 // have been cleared if they pointed to non-surviving objects.) | |
342 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure, | |
343 &GenMarkSweep::adjust_pointer_closure); | |
344 | |
345 GenMarkSweep::adjust_marks(); | |
346 | |
347 G1AdjustPointersClosure blk; | |
348 g1h->heap_region_iterate(&blk); | |
349 pg->adjust_pointers(); | |
350 } | |
351 | |
352 class G1SpaceCompactClosure: public HeapRegionClosure { | |
353 public: | |
354 G1SpaceCompactClosure() {} | |
355 | |
356 bool doHeapRegion(HeapRegion* hr) { | |
357 if (hr->isHumongous()) { | |
358 if (hr->startsHumongous()) { | |
359 oop obj = oop(hr->bottom()); | |
360 if (obj->is_gc_marked()) { | |
361 obj->init_mark(); | |
362 } else { | |
363 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
364 } | |
365 hr->reset_during_compaction(); | |
366 } | |
367 } else { | |
368 hr->compact(); | |
369 } | |
370 return false; | |
371 } | |
372 }; | |
373 | |
374 void G1MarkSweep::mark_sweep_phase4() { | |
375 // All pointers are now adjusted, move objects accordingly | |
376 | |
377 // It is imperative that we traverse perm_gen first in phase4. All | |
378 // classes must be allocated earlier than their instances, and traversing | |
379 // perm_gen first makes sure that all klassOops have moved to their new | |
380 // location before any instance does a dispatch through it's klass! | |
381 | |
382 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
383 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
384 // here (perm_gen first rather than last), so we tell the validate code | |
385 // to use a higher index (saved from phase2) when verifying perm_gen. | |
386 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
387 Generation* pg = g1h->perm_gen(); | |
388 | |
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389 TraceTime tm("phase 4", G1Log::fine() && Verbose, true, gclog_or_tty); |
342 | 390 GenMarkSweep::trace("4"); |
391 | |
392 pg->compact(); | |
393 | |
394 G1SpaceCompactClosure blk; | |
395 g1h->heap_region_iterate(&blk); | |
396 | |
397 } |