28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/icBuffer.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "gc/serial/genMarkSweep.hpp"
36 #include "gc/serial/serialGcRefProcProxyTask.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "gc/shared/gcHeapSummary.hpp"
39 #include "gc/shared/gcTimer.hpp"
40 #include "gc/shared/gcTrace.hpp"
41 #include "gc/shared/gcTraceTime.inline.hpp"
42 #include "gc/shared/genCollectedHeap.hpp"
43 #include "gc/shared/generation.hpp"
44 #include "gc/shared/genOopClosures.inline.hpp"
45 #include "gc/shared/modRefBarrierSet.hpp"
46 #include "gc/shared/referencePolicy.hpp"
47 #include "gc/shared/referenceProcessorPhaseTimes.hpp"
48 #include "gc/shared/space.hpp"
49 #include "gc/shared/strongRootsScope.hpp"
50 #include "gc/shared/weakProcessor.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/instanceRefKlass.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "prims/jvmtiExport.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/synchronizer.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/vmThread.hpp"
59 #include "utilities/copy.hpp"
60 #include "utilities/events.hpp"
61 #include "utilities/stack.inline.hpp"
62 #if INCLUDE_JVMCI
63 #include "jvmci/jvmci.hpp"
64 #endif
65
66 void GenMarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, bool clear_all_softrefs) {
67 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
76 // hook up weak ref data so it can be used during Mark-Sweep
77 assert(ref_processor() == NULL, "no stomping");
78 assert(rp != NULL, "should be non-NULL");
79 set_ref_processor(rp);
80 rp->setup_policy(clear_all_softrefs);
81
82 gch->trace_heap_before_gc(_gc_tracer);
83
84 // Increment the invocation count
85 _total_invocations++;
86
87 // Capture used regions for each generation that will be
88 // subject to collection, so that card table adjustments can
89 // be made intelligently (see clear / invalidate further below).
90 gch->save_used_regions();
91
92 allocate_stacks();
93
94 mark_sweep_phase1(clear_all_softrefs);
95
96 mark_sweep_phase2();
97
98 // Don't add any more derived pointers during phase3
99 #if COMPILER2_OR_JVMCI
100 assert(DerivedPointerTable::is_active(), "Sanity");
101 DerivedPointerTable::set_active(false);
102 #endif
103
104 mark_sweep_phase3();
105
106 mark_sweep_phase4();
107
108 restore_marks();
109
110 // Set saved marks for allocation profiler (and other things? -- dld)
111 // (Should this be in general part?)
112 gch->save_marks();
113
114 deallocate_stacks();
115
116 // If compaction completely evacuated the young generation then we
117 // can clear the card table. Otherwise, we must invalidate
118 // it (consider all cards dirty). In the future, we might consider doing
119 // compaction within generations only, and doing card-table sliding.
120 CardTableRS* rs = gch->rem_set();
121 Generation* old_gen = gch->old_gen();
122
123 // Clear/invalidate below make use of the "prev_used_regions" saved earlier.
124 if (gch->young_gen()->used() == 0) {
125 // We've evacuated the young generation.
126 rs->clear_into_younger(old_gen);
127 } else {
128 // Invalidate the cards corresponding to the currently used
129 // region and clear those corresponding to the evacuated region.
130 rs->invalidate_or_clear(old_gen);
131 }
132
133 gch->prune_scavengable_nmethods();
257
258 gch->prepare_for_compaction();
259 }
260
261 class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure {
262 public:
263 void do_generation(Generation* gen) {
264 gen->adjust_pointers();
265 }
266 };
267
268 void GenMarkSweep::mark_sweep_phase3() {
269 GenCollectedHeap* gch = GenCollectedHeap::heap();
270
271 // Adjust the pointers to reflect the new locations
272 GCTraceTime(Info, gc, phases) tm("Phase 3: Adjust pointers", gc_timer());
273
274 // Need new claim bits for the pointer adjustment tracing.
275 ClassLoaderDataGraph::clear_claimed_marks();
276
277 {
278 StrongRootsScope srs(0);
279
280 gch->full_process_roots(true, // this is the adjust phase
281 GenCollectedHeap::SO_AllCodeCache,
282 false, // all roots
283 &adjust_pointer_closure,
284 &adjust_cld_closure);
285 }
286
287 gch->gen_process_weak_roots(&adjust_pointer_closure);
288
289 adjust_marks();
290 GenAdjustPointersClosure blk;
291 gch->generation_iterate(&blk, true);
292 }
293
294 class GenCompactClosure: public GenCollectedHeap::GenClosure {
295 public:
296 void do_generation(Generation* gen) {
297 gen->compact();
298 }
299 };
300
301 void GenMarkSweep::mark_sweep_phase4() {
302 // All pointers are now adjusted, move objects accordingly
303
304 // It is imperative that we traverse perm_gen first in phase4. All
305 // classes must be allocated earlier than their instances, and traversing
306 // perm_gen first makes sure that all Klass*s have moved to their new
307 // location before any instance does a dispatch through it's klass!
308
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28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/icBuffer.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "gc/serial/genMarkSweep.hpp"
36 #include "gc/serial/serialGcRefProcProxyTask.hpp"
37 #include "gc/shared/collectedHeap.inline.hpp"
38 #include "gc/shared/gcHeapSummary.hpp"
39 #include "gc/shared/gcTimer.hpp"
40 #include "gc/shared/gcTrace.hpp"
41 #include "gc/shared/gcTraceTime.inline.hpp"
42 #include "gc/shared/genCollectedHeap.hpp"
43 #include "gc/shared/generation.hpp"
44 #include "gc/shared/genOopClosures.inline.hpp"
45 #include "gc/shared/modRefBarrierSet.hpp"
46 #include "gc/shared/referencePolicy.hpp"
47 #include "gc/shared/referenceProcessorPhaseTimes.hpp"
48 #include "gc/shared/slidingForwarding.hpp"
49 #include "gc/shared/space.hpp"
50 #include "gc/shared/strongRootsScope.hpp"
51 #include "gc/shared/weakProcessor.hpp"
52 #include "memory/universe.hpp"
53 #include "oops/instanceRefKlass.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/synchronizer.hpp"
58 #include "runtime/thread.inline.hpp"
59 #include "runtime/vmThread.hpp"
60 #include "utilities/copy.hpp"
61 #include "utilities/events.hpp"
62 #include "utilities/stack.inline.hpp"
63 #if INCLUDE_JVMCI
64 #include "jvmci/jvmci.hpp"
65 #endif
66
67 void GenMarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, bool clear_all_softrefs) {
68 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
77 // hook up weak ref data so it can be used during Mark-Sweep
78 assert(ref_processor() == NULL, "no stomping");
79 assert(rp != NULL, "should be non-NULL");
80 set_ref_processor(rp);
81 rp->setup_policy(clear_all_softrefs);
82
83 gch->trace_heap_before_gc(_gc_tracer);
84
85 // Increment the invocation count
86 _total_invocations++;
87
88 // Capture used regions for each generation that will be
89 // subject to collection, so that card table adjustments can
90 // be made intelligently (see clear / invalidate further below).
91 gch->save_used_regions();
92
93 allocate_stacks();
94
95 mark_sweep_phase1(clear_all_softrefs);
96
97 SlidingForwarding::begin();
98
99 mark_sweep_phase2();
100
101 // Don't add any more derived pointers during phase3
102 #if COMPILER2_OR_JVMCI
103 assert(DerivedPointerTable::is_active(), "Sanity");
104 DerivedPointerTable::set_active(false);
105 #endif
106
107 mark_sweep_phase3();
108
109 mark_sweep_phase4();
110
111 restore_marks();
112
113 // Set saved marks for allocation profiler (and other things? -- dld)
114 // (Should this be in general part?)
115 gch->save_marks();
116
117 SlidingForwarding::end();
118
119 deallocate_stacks();
120
121 // If compaction completely evacuated the young generation then we
122 // can clear the card table. Otherwise, we must invalidate
123 // it (consider all cards dirty). In the future, we might consider doing
124 // compaction within generations only, and doing card-table sliding.
125 CardTableRS* rs = gch->rem_set();
126 Generation* old_gen = gch->old_gen();
127
128 // Clear/invalidate below make use of the "prev_used_regions" saved earlier.
129 if (gch->young_gen()->used() == 0) {
130 // We've evacuated the young generation.
131 rs->clear_into_younger(old_gen);
132 } else {
133 // Invalidate the cards corresponding to the currently used
134 // region and clear those corresponding to the evacuated region.
135 rs->invalidate_or_clear(old_gen);
136 }
137
138 gch->prune_scavengable_nmethods();
262
263 gch->prepare_for_compaction();
264 }
265
266 class GenAdjustPointersClosure: public GenCollectedHeap::GenClosure {
267 public:
268 void do_generation(Generation* gen) {
269 gen->adjust_pointers();
270 }
271 };
272
273 void GenMarkSweep::mark_sweep_phase3() {
274 GenCollectedHeap* gch = GenCollectedHeap::heap();
275
276 // Adjust the pointers to reflect the new locations
277 GCTraceTime(Info, gc, phases) tm("Phase 3: Adjust pointers", gc_timer());
278
279 // Need new claim bits for the pointer adjustment tracing.
280 ClassLoaderDataGraph::clear_claimed_marks();
281
282 if (UseAltGCForwarding) {
283 AdjustPointerClosure<true> adjust_pointer_closure;
284 CLDToOopClosure adjust_cld_closure(&adjust_pointer_closure, ClassLoaderData::_claim_strong);
285 {
286 StrongRootsScope srs(0);
287 gch->full_process_roots(true, // this is the adjust phase
288 GenCollectedHeap::SO_AllCodeCache,
289 false, // all roots
290 &adjust_pointer_closure,
291 &adjust_cld_closure);
292 }
293 gch->gen_process_weak_roots(&adjust_pointer_closure);
294 } else {
295 AdjustPointerClosure<false> adjust_pointer_closure;
296 CLDToOopClosure adjust_cld_closure(&adjust_pointer_closure, ClassLoaderData::_claim_strong);
297 {
298 StrongRootsScope srs(0);
299 gch->full_process_roots(true, // this is the adjust phase
300 GenCollectedHeap::SO_AllCodeCache,
301 false, // all roots
302 &adjust_pointer_closure,
303 &adjust_cld_closure);
304 }
305 gch->gen_process_weak_roots(&adjust_pointer_closure);
306 }
307 adjust_marks();
308 GenAdjustPointersClosure blk;
309 gch->generation_iterate(&blk, true);
310 }
311
312 class GenCompactClosure: public GenCollectedHeap::GenClosure {
313 public:
314 void do_generation(Generation* gen) {
315 gen->compact();
316 }
317 };
318
319 void GenMarkSweep::mark_sweep_phase4() {
320 // All pointers are now adjusted, move objects accordingly
321
322 // It is imperative that we traverse perm_gen first in phase4. All
323 // classes must be allocated earlier than their instances, and traversing
324 // perm_gen first makes sure that all Klass*s have moved to their new
325 // location before any instance does a dispatch through it's klass!
326
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