1 /*
2 * Copyright (c) 2013, 2018, Red Hat, Inc. and/or its affiliates.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAP_HPP
25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAP_HPP
26
27 #include "gc/shared/markBitMap.hpp"
28 #include "gc/shared/softRefPolicy.hpp"
29 #include "gc/shared/collectedHeap.hpp"
30 #include "gc/shenandoah/shenandoahHeapLock.hpp"
31 #include "gc/shenandoah/shenandoahEvacOOMHandler.hpp"
32 #include "gc/shenandoah/shenandoahSharedVariables.hpp"
33 #include "gc/shenandoah/shenandoahWorkGroup.hpp"
34 #include "services/memoryManager.hpp"
35
36 class ConcurrentGCTimer;
37 class PLABStats;
38 class ShenandoahAsserts;
39 class ShenandoahAllocTracker;
40 class ShenandoahCollectorPolicy;
41 class ShenandoahConnectionMatrix;
42 class ShenandoahControlThread;
43 class ShenandoahFastRegionSet;
44 class ShenandoahPhaseTimings;
45 class ShenandoahHeap;
46 class ShenandoahHeapRegion;
47 class ShenandoahHeapRegionClosure;
48 class ShenandoahHeapRegionSet;
49 class ShenandoahCollectionSet;
50 class ShenandoahFreeSet;
51 class ShenandoahConcurrentMark;
52 class ShenandoahMarkCompact;
53 class ShenandoahPacer;
54 class ShenandoahTraversalGC;
55 class ShenandoahVerifier;
56 class ShenandoahMonitoringSupport;
57
58 class ShenandoahRegionIterator : public StackObj {
59 private:
60 volatile size_t _index;
61 ShenandoahHeap* _heap;
62
63 // No implicit copying: iterators should be passed by reference to capture the state,
64 // or be copied explicitly by "=" operator
65 ShenandoahRegionIterator(const ShenandoahRegionIterator& that);
66
67 public:
68 ShenandoahRegionIterator();
69 ShenandoahRegionIterator(ShenandoahHeap* heap);
70
71 ShenandoahRegionIterator& operator=(const ShenandoahRegionIterator& o);
72
73 // Returns next region, or NULL if there are no more regions.
74 // This is multi-thread-safe.
75 inline ShenandoahHeapRegion* next();
76
77 // This is *not* MT safe. However, in the absence of multithreaded access, it
78 // can be used to determine if there is more work to do.
79 bool has_next() const;
80 };
81
82 class ShenandoahHeapRegionClosure : public StackObj {
83 public:
84 // typically called on each region until it returns true;
85 virtual bool heap_region_do(ShenandoahHeapRegion* r) = 0;
86 };
87
88 class ShenandoahUpdateRefsClosure: public OopClosure {
89 private:
90 ShenandoahHeap* _heap;
91
92 template <class T>
93 inline void do_oop_work(T* p);
94
95 public:
96 ShenandoahUpdateRefsClosure();
97 inline void do_oop(oop* p);
98 inline void do_oop(narrowOop* p);
99 };
100
101 #ifdef ASSERT
102 class ShenandoahAssertToSpaceClosure : public OopClosure {
103 private:
104 template <class T>
105 void do_oop_nv(T* p);
106 public:
107 void do_oop(narrowOop* p);
108 void do_oop(oop* p);
109 };
110 #endif
111
112 class ShenandoahAlwaysTrueClosure : public BoolObjectClosure {
113 public:
114 bool do_object_b(oop p) { return true; }
115 };
116
117 class ShenandoahForwardedIsAliveClosure: public BoolObjectClosure {
118 private:
119 ShenandoahHeap* _heap;
120 public:
121 ShenandoahForwardedIsAliveClosure();
122 void init(ShenandoahHeap* heap) {
123 _heap = heap;
124 }
125 bool do_object_b(oop obj);
126 };
127
128 class ShenandoahIsAliveClosure: public BoolObjectClosure {
129 private:
130 ShenandoahHeap* _heap;
131 public:
132 ShenandoahIsAliveClosure();
133 void init(ShenandoahHeap* heap) {
134 _heap = heap;
135 }
136 bool do_object_b(oop obj);
137 };
138
139 class VMStructs;
140
141 // // A "ShenandoahHeap" is an implementation of a java heap for HotSpot.
142 // // It uses a new pauseless GC algorithm based on Brooks pointers.
143 // // Derived from G1
144
145 // //
146 // // CollectedHeap
147 // // SharedHeap
148 // // ShenandoahHeap
149 class ShenandoahHeap : public CollectedHeap {
150 friend class ShenandoahAsserts;
151 friend class VMStructs;
152
153 enum CancelState {
154
155 // Normal state. GC has not been cancelled and is open for cancellation.
156 // Worker threads can suspend for safepoint.
157 CANCELLABLE,
158
159 // GC has been cancelled. Worker threads can not suspend for
160 // safepoint but must finish their work as soon as possible.
161 CANCELLED,
162
163 // GC has not been cancelled and must not be cancelled. At least
164 // one worker thread checks for pending safepoint and may suspend
165 // if a safepoint is pending.
166 NOT_CANCELLED
167
168 };
169
170 public:
171 // GC state describes the important parts of collector state, that may be
172 // used to make barrier selection decisions in the native and generated code.
173 // Multiple bits can be set at once.
174 //
175 // Important invariant: when GC state is zero, the heap is stable, and no barriers
176 // are required.
177 enum GCStateBitPos {
178 // Heap has forwarded objects: need RB, ACMP, CAS barriers.
179 HAS_FORWARDED_BITPOS = 0,
180
181 // Heap is under marking: needs SATB barriers.
182 MARKING_BITPOS = 1,
183
184 // Heap is under evacuation: needs WB barriers. (Set together with UNSTABLE)
185 EVACUATION_BITPOS = 2,
186
187 // Heap is under updating: needs SVRB/SVWB barriers.
188 UPDATEREFS_BITPOS = 3,
189
190 // Heap is under traversal collection
191 TRAVERSAL_BITPOS = 4,
192 };
193
194 enum GCState {
195 STABLE = 0,
196 HAS_FORWARDED = 1 << HAS_FORWARDED_BITPOS,
197 MARKING = 1 << MARKING_BITPOS,
198 EVACUATION = 1 << EVACUATION_BITPOS,
199 UPDATEREFS = 1 << UPDATEREFS_BITPOS,
200 TRAVERSAL = 1 << TRAVERSAL_BITPOS,
201 };
202
203 enum ShenandoahDegenPoint {
204 _degenerated_unset,
205 _degenerated_traversal,
206 _degenerated_outside_cycle,
207 _degenerated_mark,
208 _degenerated_evac,
209 _degenerated_updaterefs,
210 _DEGENERATED_LIMIT,
211 };
212
213 enum GCCycleMode {
214 NONE,
215 MINOR,
216 MAJOR
217 };
218
219 static const char* degen_point_to_string(ShenandoahDegenPoint point) {
220 switch (point) {
221 case _degenerated_unset:
222 return "<UNSET>";
223 case _degenerated_traversal:
224 return "Traversal";
225 case _degenerated_outside_cycle:
226 return "Outside of Cycle";
227 case _degenerated_mark:
228 return "Mark";
229 case _degenerated_evac:
230 return "Evacuation";
231 case _degenerated_updaterefs:
232 return "Update Refs";
233 default:
234 ShouldNotReachHere();
235 return "ERROR";
236 }
237 };
238
239 private:
240 ShenandoahSharedBitmap _gc_state;
241 ShenandoahHeapLock _lock;
242 ShenandoahCollectorPolicy* _shenandoah_policy;
243 SoftRefPolicy _soft_ref_policy;
244 size_t _bitmap_size;
245 size_t _bitmap_regions_per_slice;
246 size_t _bitmap_bytes_per_slice;
247 MemRegion _heap_region;
248 MemRegion _bitmap0_region;
249 MemRegion _bitmap1_region;
250 MemRegion _aux_bitmap_region;
251
252 ShenandoahHeapRegion** _regions;
253 ShenandoahFreeSet* _free_set;
254 ShenandoahCollectionSet* _collection_set;
255
256 ShenandoahRegionIterator _update_refs_iterator;
257
258 ShenandoahConcurrentMark* _scm;
259 ShenandoahMarkCompact* _full_gc;
260 ShenandoahTraversalGC* _traversal_gc;
261 ShenandoahVerifier* _verifier;
262 ShenandoahPacer* _pacer;
263
264 ShenandoahControlThread* _control_thread;
265
266 ShenandoahMonitoringSupport* _monitoring_support;
267
268 ShenandoahPhaseTimings* _phase_timings;
269 ShenandoahAllocTracker* _alloc_tracker;
270
271 size_t _num_regions;
272 size_t _initial_size;
273
274 uint _max_workers;
275 ShenandoahWorkGang* _workers;
276 ShenandoahWorkGang* _safepoint_workers;
277
278 volatile size_t _used;
279 volatile size_t _committed;
280
281 MarkBitMap _verification_bit_map;
282 MarkBitMap _mark_bit_map0;
283 MarkBitMap _mark_bit_map1;
284 MarkBitMap* _complete_mark_bit_map;
285 MarkBitMap* _next_mark_bit_map;
286 MarkBitMap _aux_bit_map;
287
288 HeapWord** _complete_top_at_mark_starts;
289 HeapWord** _complete_top_at_mark_starts_base;
290
291 HeapWord** _next_top_at_mark_starts;
292 HeapWord** _next_top_at_mark_starts_base;
293
294 volatile size_t _bytes_allocated_since_gc_start;
295
296 ShenandoahSharedFlag _degenerated_gc_in_progress;
297 ShenandoahSharedFlag _full_gc_in_progress;
298 ShenandoahSharedFlag _full_gc_move_in_progress;
299
300 ShenandoahSharedFlag _inject_alloc_failure;
301
302 ShenandoahSharedFlag _process_references;
303 ShenandoahSharedFlag _unload_classes;
304
305 ShenandoahSharedEnumFlag<CancelState> _cancelled_concgc;
306
307 ReferenceProcessor* _ref_processor;
308
309 ShenandoahForwardedIsAliveClosure _forwarded_is_alive;
310 ShenandoahIsAliveClosure _is_alive;
311
312 ConcurrentGCTimer* _gc_timer;
313
314 ShenandoahConnectionMatrix* _connection_matrix;
315
316 GCMemoryManager _stw_memory_manager;
317 GCMemoryManager _cycle_memory_manager;
318
319 MemoryPool* _memory_pool;
320
321 ShenandoahEvacOOMHandler _oom_evac_handler;
322
323 ShenandoahSharedEnumFlag<GCCycleMode> _gc_cycle_mode;
324
325 PLABStats* _mutator_gclab_stats;
326 PLABStats* _collector_gclab_stats;
327
328 #ifdef ASSERT
329 int _heap_expansion_count;
330 #endif
331
332 public:
333 ShenandoahHeap(ShenandoahCollectorPolicy* policy);
334
335 const char* name() const /* override */;
336 HeapWord* allocate_new_tlab(size_t word_size) /* override */;
337 void print_on(outputStream* st) const /* override */;
338 void print_extended_on(outputStream *st) const /* override */;
339
340 ShenandoahHeap::Name kind() const /* override */{
341 return CollectedHeap::Shenandoah;
342 }
343
344 jint initialize() /* override */;
345 void post_initialize() /* override */;
346 size_t capacity() const /* override */;
347 size_t used() const /* override */;
348 size_t committed() const;
349 bool is_maximal_no_gc() const /* override */;
350 size_t max_capacity() const /* override */;
351 size_t initial_capacity() const /* override */;
352 bool is_in(const void* p) const /* override */;
353 bool is_scavengable(oop obj) /* override */;
354 HeapWord* mem_allocate(size_t size, Klass* klass, Thread* thread, bool* what) /* override */;
355 void fill_with_object_impl(HeapWord* start, size_t words, bool zap = true) /* override */;
356 bool can_elide_tlab_store_barriers() const /* override */;
357 oop new_store_pre_barrier(JavaThread* thread, oop new_obj) /* override */;
358 bool can_elide_initializing_store_barrier(oop new_obj) /* override */;
359 bool card_mark_must_follow_store() const /* override */;
360 void collect(GCCause::Cause cause) /* override */;
361 void do_full_collection(bool clear_all_soft_refs) /* override */;
362 AdaptiveSizePolicy* size_policy() /* override */;
363 CollectorPolicy* collector_policy() const /* override */;
364 SoftRefPolicy* soft_ref_policy() /* override */;
365 void ensure_parsability(bool retire_tlabs) /* override */;
366 HeapWord* block_start(const void* addr) const /* override */;
367 size_t block_size(const HeapWord* addr) const /* override */;
368 bool block_is_obj(const HeapWord* addr) const /* override */;
369 jlong millis_since_last_gc() /* override */;
370 void prepare_for_verify() /* override */;
371 void print_gc_threads_on(outputStream* st) const /* override */;
372 void gc_threads_do(ThreadClosure* tcl) const /* override */;
373 void print_tracing_info() const /* override */;
374 void verify(VerifyOption vo) /* override */;
375 bool supports_tlab_allocation() const /* override */;
376 size_t tlab_capacity(Thread *thr) const /* override */;
377 void object_iterate(ObjectClosure* cl) /* override */;
378 void safe_object_iterate(ObjectClosure* cl) /* override */;
379 size_t unsafe_max_tlab_alloc(Thread *thread) const /* override */;
380 size_t max_tlab_size() const /* override */;
381 HeapWord* tlab_post_allocation_setup(HeapWord* obj) /* override */;
382 uint oop_extra_words() /* override */;
383 size_t tlab_used(Thread* ignored) const /* override */;
384 void stop() /* override */;
385 virtual void safepoint_synchronize_begin();
386 virtual void safepoint_synchronize_end();
387
388 WorkGang* get_safepoint_workers() { return _safepoint_workers; }
389
390 #ifndef CC_INTERP
391 void compile_prepare_oop(MacroAssembler* masm, Register obj) /* override */;
392 #endif
393
394 void register_nmethod(nmethod* nm);
395 void unregister_nmethod(nmethod* nm);
396
397 /* override: object pinning support */
398 bool supports_object_pinning() const { return true; }
399 oop pin_object(JavaThread* thread, oop obj);
400 void unpin_object(JavaThread* thread, oop obj);
401
402 static ShenandoahHeap* heap();
403 static ShenandoahHeap* heap_no_check();
404 static address in_cset_fast_test_addr();
405 static address cancelled_concgc_addr();
406 static address gc_state_addr();
407
408 ShenandoahCollectorPolicy *shenandoahPolicy() const { return _shenandoah_policy; }
409 ShenandoahPhaseTimings* phase_timings() const { return _phase_timings; }
410 ShenandoahAllocTracker* alloc_tracker() const { return _alloc_tracker; }
411
412 void accumulate_statistics_all_gclabs();
413 PLABStats* mutator_gclab_stats() const { return _mutator_gclab_stats; }
414 PLABStats* collector_gclab_stats() const { return _collector_gclab_stats; }
415
416 inline ShenandoahHeapRegion* const heap_region_containing(const void* addr) const;
417 inline size_t heap_region_index_containing(const void* addr) const;
418 inline bool requires_marking(const void* entry) const;
419
420 template <class T>
421 inline oop evac_update_with_forwarded(T* p);
422
423 template <class T>
424 inline oop maybe_update_with_forwarded(T* p);
425
426 template <class T>
427 inline oop maybe_update_with_forwarded_not_null(T* p, oop obj);
428
429 template <class T>
430 inline oop update_with_forwarded_not_null(T* p, oop obj);
431
432 void trash_cset_regions();
433
434 void stop_concurrent_marking();
435
436 void prepare_for_concurrent_evacuation();
437 void evacuate_and_update_roots();
438 // Fixup roots after concurrent cycle failed
439 void fixup_roots();
440
441 void update_heap_references(bool concurrent);
442
443 void roots_iterate(OopClosure* cl);
444
445 private:
446 void set_gc_state_all_threads(char state);
447 void set_gc_state_mask(uint mask, bool value);
448
449 public:
450 void set_concurrent_mark_in_progress(bool in_progress);
451 void set_evacuation_in_progress(bool in_progress);
452 void set_update_refs_in_progress(bool in_progress);
453 void set_degenerated_gc_in_progress(bool in_progress);
454 void set_full_gc_in_progress(bool in_progress);
455 void set_full_gc_move_in_progress(bool in_progress);
456 void set_concurrent_traversal_in_progress(bool in_progress);
457 void set_has_forwarded_objects(bool cond);
458
459 void set_process_references(bool pr);
460 void set_unload_classes(bool uc);
461
462 inline bool is_stable() const;
463 inline bool is_idle() const;
464 inline bool is_concurrent_mark_in_progress() const;
465 inline bool is_update_refs_in_progress() const;
466 inline bool is_evacuation_in_progress() const;
467 inline bool is_degenerated_gc_in_progress() const;
468 inline bool is_full_gc_in_progress() const;
469 inline bool is_full_gc_move_in_progress() const;
470 inline bool is_concurrent_traversal_in_progress() const;
471 inline bool has_forwarded_objects() const;
472 inline bool is_gc_in_progress_mask(uint mask) const;
473
474 char gc_state() const;
475
476 bool process_references() const;
477 bool unload_classes() const;
478
479 bool is_minor_gc() const;
480 bool is_major_gc() const;
481 void set_cycle_mode(GCCycleMode gc_cycle_mode);
482
483 inline bool region_in_collection_set(size_t region_index) const;
484
485 // Mainly there to avoid accidentally calling the templated
486 // method below with ShenandoahHeapRegion* which would be *wrong*.
487 inline bool in_collection_set(ShenandoahHeapRegion* r) const;
488
489 template <class T>
490 inline bool in_collection_set(T obj) const;
491
492 inline bool allocated_after_next_mark_start(HeapWord* addr) const;
493 void set_next_top_at_mark_start(HeapWord* region_base, HeapWord* addr);
494 HeapWord* next_top_at_mark_start(HeapWord* region_base);
495
496 inline bool allocated_after_complete_mark_start(HeapWord* addr) const;
497 void set_complete_top_at_mark_start(HeapWord* region_base, HeapWord* addr);
498 HeapWord* complete_top_at_mark_start(HeapWord* region_base);
499
500 // Evacuates object src. Returns the evacuated object if this thread
501 // succeeded, otherwise rolls back the evacuation and returns the
502 // evacuated object by the competing thread.
503 inline oop evacuate_object(oop src, Thread* thread);
504 inline bool cancelled_concgc() const;
505 inline bool check_cancelled_concgc_and_yield(bool sts_active = true);
506 inline bool try_cancel_concgc();
507 inline void clear_cancelled_concgc();
508
509 inline ShenandoahHeapRegion* const get_region(size_t region_idx) const;
510 void heap_region_iterate(ShenandoahHeapRegionClosure& cl) const;
511
512 ShenandoahFreeSet* free_set() const { return _free_set; }
513 ShenandoahCollectionSet* collection_set() const { return _collection_set; }
514
515 ShenandoahConnectionMatrix* connection_matrix() const;
516
517 void increase_used(size_t bytes);
518 void decrease_used(size_t bytes);
519
520 void set_used(size_t bytes);
521
522 void increase_committed(size_t bytes);
523 void decrease_committed(size_t bytes);
524
525 void increase_allocated(size_t bytes);
526
527 void notify_alloc(size_t words, bool waste);
528
529 void handle_heap_shrinkage(double shrink_before);
530
531 void reset_next_mark_bitmap();
532 void reset_next_mark_bitmap_traversal();
533
534 MarkBitMap* complete_mark_bit_map();
535 MarkBitMap* next_mark_bit_map();
536 inline bool is_marked_complete(oop obj) const;
537 inline bool mark_next(oop obj) const;
538 inline bool is_marked_next(oop obj) const;
539 bool is_next_bitmap_clear();
540 bool is_next_bitmap_clear_range(HeapWord* start, HeapWord* end);
541 bool is_complete_bitmap_clear_range(HeapWord* start, HeapWord* end);
542
543 bool commit_bitmap_slice(ShenandoahHeapRegion *r);
544 bool uncommit_bitmap_slice(ShenandoahHeapRegion *r);
545
546 // Hint that the bitmap slice is not needed
547 bool idle_bitmap_slice(ShenandoahHeapRegion* r);
548 void activate_bitmap_slice(ShenandoahHeapRegion* r);
549
550 bool is_bitmap_slice_committed(ShenandoahHeapRegion* r, bool skip_self = false);
551
552 void print_heap_regions_on(outputStream* st) const;
553
554 size_t bytes_allocated_since_gc_start();
555 void reset_bytes_allocated_since_gc_start();
556
557 void trash_humongous_region_at(ShenandoahHeapRegion *r);
558
559 virtual GrowableArray<GCMemoryManager*> memory_managers();
560 virtual GrowableArray<MemoryPool*> memory_pools();
561
562 ShenandoahMonitoringSupport* monitoring_support();
563 ShenandoahConcurrentMark* concurrentMark() { return _scm; }
564 ShenandoahMarkCompact* full_gc() { return _full_gc; }
565 ShenandoahTraversalGC* traversal_gc();
566 ShenandoahVerifier* verifier();
567 ShenandoahPacer* pacer() const;
568
569 ReferenceProcessor* ref_processor() { return _ref_processor;}
570
571 WorkGang* workers() const { return _workers;}
572
573 uint max_workers();
574
575 void assert_gc_workers(uint nworker) PRODUCT_RETURN;
576
577 void do_evacuation();
578 ShenandoahHeapRegion* next_compaction_region(const ShenandoahHeapRegion* r);
579
580 void heap_region_iterate(ShenandoahHeapRegionClosure* blk, bool skip_cset_regions = false, bool skip_humongous_continuation = false) const;
581
582 // Delete entries for dead interned string and clean up unreferenced symbols
583 // in symbol table, possibly in parallel.
584 void unload_classes_and_cleanup_tables(bool full_gc);
585
586 inline size_t num_regions() const { return _num_regions; }
587
588 BoolObjectClosure* is_alive_closure();
589
590 // Call before starting evacuation.
591 void enter_evacuation();
592 // Call after finished with evacuation.
593 void leave_evacuation();
594
595 private:
596 template<class T>
597 inline void marked_object_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit);
598
599 template<class T>
600 inline void marked_object_oop_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit);
601
602 public:
603 template<class T>
604 inline void marked_object_iterate(ShenandoahHeapRegion* region, T* cl);
605
606 template<class T>
607 inline void marked_object_safe_iterate(ShenandoahHeapRegion* region, T* cl);
608
609 template<class T>
610 inline void marked_object_oop_iterate(ShenandoahHeapRegion* region, T* cl);
611
612 template<class T>
613 inline void marked_object_oop_safe_iterate(ShenandoahHeapRegion* region, T* cl);
614
615 GCTimer* gc_timer() const;
616
617 void swap_mark_bitmaps();
618
619 void cancel_concgc(GCCause::Cause cause);
620
621 ShenandoahHeapLock* lock() { return &_lock; }
622 void assert_heaplock_owned_by_current_thread() PRODUCT_RETURN;
623 void assert_heaplock_not_owned_by_current_thread() PRODUCT_RETURN;
624 void assert_heaplock_or_safepoint() PRODUCT_RETURN;
625
626 public:
627 typedef enum {
628 _alloc_shared, // Allocate common, outside of TLAB
629 _alloc_shared_gc, // Allocate common, outside of GCLAB
630 _alloc_tlab, // Allocate TLAB
631 _alloc_gclab, // Allocate GCLAB
632 _ALLOC_LIMIT,
633 } AllocType;
634
635 static const char* alloc_type_to_string(AllocType type) {
636 switch (type) {
637 case _alloc_shared:
638 return "Shared";
639 case _alloc_shared_gc:
640 return "Shared GC";
641 case _alloc_tlab:
642 return "TLAB";
643 case _alloc_gclab:
644 return "GCLAB";
645 default:
646 ShouldNotReachHere();
647 return "";
648 }
649 }
650 private:
651
652 virtual void initialize_serviceability();
653
654 HeapWord* allocate_new_lab(size_t word_size, AllocType type);
655 HeapWord* allocate_memory_under_lock(size_t word_size, AllocType type, bool &new_region);
656 HeapWord* allocate_memory(size_t word_size, AllocType type);
657 // Shenandoah functionality.
658 inline HeapWord* allocate_from_gclab(Thread* thread, size_t size);
659 HeapWord* allocate_from_gclab_slow(Thread* thread, size_t size);
660 HeapWord* allocate_new_gclab(size_t word_size);
661
662 template<class T>
663 inline void do_object_marked_complete(T* cl, oop obj);
664
665 ShenandoahControlThread* control_thread() { return _control_thread; }
666
667 public:
668 inline oop atomic_compare_exchange_oop(oop n, narrowOop* addr, oop c);
669 inline oop atomic_compare_exchange_oop(oop n, oop* addr, oop c);
670
671 private:
672 void ref_processing_init();
673
674 GCTracer* tracer();
675
676 private:
677 uint64_t _alloc_seq_at_last_gc_start;
678 uint64_t _alloc_seq_at_last_gc_end;
679 size_t _used_at_last_gc;
680
681 public:
682 uint64_t alloc_seq_at_last_gc_end() const { return _alloc_seq_at_last_gc_end; }
683 uint64_t alloc_seq_at_last_gc_start() const { return _alloc_seq_at_last_gc_start;}
684 size_t used_at_last_gc() const { return _used_at_last_gc;}
685
686 void set_alloc_seq_gc_start();
687 void set_alloc_seq_gc_end();
688
689 void set_used_at_last_gc() {_used_at_last_gc = used();}
690
691 void make_tlabs_parsable(bool retire_tlabs) /* override */;
692
693 GCMemoryManager* cycle_memory_manager() { return &_cycle_memory_manager; }
694 GCMemoryManager* stw_memory_manager() { return &_stw_memory_manager; }
695
696 public:
697 // Entry points to STW GC operations, these cause a related safepoint, that then
698 // call the entry method below
699 void vmop_entry_init_mark();
700 void vmop_entry_final_mark();
701 void vmop_entry_final_evac();
702 void vmop_entry_init_updaterefs();
703 void vmop_entry_final_updaterefs();
704 void vmop_entry_init_traversal();
705 void vmop_entry_final_traversal();
706 void vmop_entry_full(GCCause::Cause cause);
707 void vmop_degenerated(ShenandoahDegenPoint point);
708
709 // Entry methods to normally STW GC operations. These set up logging, monitoring
710 // and workers for net VM operation
711 void entry_init_mark();
712 void entry_final_mark();
713 void entry_final_evac();
714 void entry_init_updaterefs();
715 void entry_final_updaterefs();
716 void entry_init_traversal();
717 void entry_final_traversal();
718 void entry_full(GCCause::Cause cause);
719 void entry_degenerated(int point);
720
721 // Entry methods to normally concurrent GC operations. These set up logging, monitoring
722 // for concurrent operation.
723 void entry_mark();
724 void entry_preclean();
725 void entry_cleanup();
726 void entry_cleanup_bitmaps();
727 void entry_cleanup_traversal();
728 void entry_evac();
729 void entry_updaterefs();
730 void entry_traversal();
731
732 private:
733 // Actual work for the phases
734 void op_init_mark();
735 void op_final_mark();
736 void op_final_evac();
737 void op_init_updaterefs();
738 void op_final_updaterefs();
739 void op_init_traversal();
740 void op_final_traversal();
741 void op_full(GCCause::Cause cause);
742 void op_degenerated(ShenandoahDegenPoint point);
743 void op_degenerated_fail();
744 void op_degenerated_futile();
745
746 void op_mark();
747 void op_preclean();
748 void op_cleanup();
749 void op_evac();
750 void op_updaterefs();
751 void op_cleanup_bitmaps();
752 void op_cleanup_traversal();
753 void op_traversal();
754
755 private:
756 void try_inject_alloc_failure();
757 bool should_inject_alloc_failure();
758 };
759
760 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAP_HPP