1 /*
2 * Copyright (c) 2013, 2017, 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/shenandoah/shenandoahHeapLock.hpp"
29 #include "gc/shenandoah/shenandoahSharedVariables.hpp"
30 #include "gc/shenandoah/shenandoahWorkGroup.hpp"
31 #include "services/memoryManager.hpp"
32
33 class ConcurrentGCTimer;
34 class ShenandoahAsserts;
35 class ShenandoahAllocTracker;
36 class ShenandoahCollectorPolicy;
37 class ShenandoahConnectionMatrix;
38 class ShenandoahPhaseTimings;
39 class ShenandoahHeap;
40 class ShenandoahHeapRegion;
41 class ShenandoahHeapRegionClosure;
42 class ShenandoahHeapRegionSet;
43 class ShenandoahCollectionSet;
44 class ShenandoahFreeSet;
45 class ShenandoahConcurrentMark;
46 class ShenandoahMarkCompact;
47 class ShenandoahPartialGC;
48 class ShenandoahTraversalGC;
49 class ShenandoahVerifier;
50 class ShenandoahConcurrentThread;
51 class ShenandoahMonitoringSupport;
52
53 class ShenandoahUpdateRefsClosure: public OopClosure {
54 private:
55 ShenandoahHeap* _heap;
56
57 template <class T>
58 inline void do_oop_work(T* p);
59
60 public:
61 ShenandoahUpdateRefsClosure();
62 inline void do_oop(oop* p);
63 inline void do_oop(narrowOop* p);
64 };
65
66 #ifdef ASSERT
67 class ShenandoahAssertToSpaceClosure : public OopClosure {
68 private:
69 template <class T>
70 void do_oop_nv(T* p);
71 public:
72 void do_oop(narrowOop* p);
73 void do_oop(oop* p);
74 };
75 #endif
76
77 class ShenandoahAlwaysTrueClosure : public BoolObjectClosure {
78 public:
79 bool do_object_b(oop p) { return true; }
80 };
81
82 class ShenandoahForwardedIsAliveClosure: public BoolObjectClosure {
83 private:
84 ShenandoahHeap* _heap;
85 public:
86 ShenandoahForwardedIsAliveClosure();
87 void init(ShenandoahHeap* heap) {
88 _heap = heap;
89 }
90 bool do_object_b(oop obj);
91 };
92
93 class ShenandoahIsAliveClosure: public BoolObjectClosure {
94 private:
95 ShenandoahHeap* _heap;
96 public:
97 ShenandoahIsAliveClosure();
98 void init(ShenandoahHeap* heap) {
99 _heap = heap;
100 }
101 bool do_object_b(oop obj);
102 };
103
104 class VMStructs;
105
106 // // A "ShenandoahHeap" is an implementation of a java heap for HotSpot.
107 // // It uses a new pauseless GC algorithm based on Brooks pointers.
108 // // Derived from G1
109
110 // //
111 // // CollectedHeap
112 // // SharedHeap
113 // // ShenandoahHeap
114 class ShenandoahHeap : public CollectedHeap {
115 friend class ShenandoahAsserts;
116 friend class VMStructs;
117
118 enum CancelState {
119
120 // Normal state. GC has not been cancelled and is open for cancellation.
121 // Worker threads can suspend for safepoint.
122 CANCELLABLE,
123
124 // GC has been cancelled. Worker threads can not suspend for
125 // safepoint but must finish their work as soon as possible.
126 CANCELLED,
127
128 // GC has not been cancelled and must not be cancelled. At least
129 // one worker thread checks for pending safepoint and may suspend
130 // if a safepoint is pending.
131 NOT_CANCELLED
132
133 };
134
135 public:
136 // GC state describes the important parts of collector state, that may be
137 // used to make barrier selection decisions in the native and generated code.
138 // Multiple bits can be set at once.
139 //
140 // Important invariant: when GC state is zero, the heap is stable, and no barriers
141 // are required.
142 enum GCStateBitPos {
143 // Heap has forwarded objects: need RB, ACMP, CAS barriers.
144 HAS_FORWARDED_BITPOS = 0,
145
146 // Heap is under marking: needs SATB barriers.
147 MARKING_BITPOS = 1,
148
149 // Heap is under evacuation: needs WB barriers. (Set together with UNSTABLE)
150 EVACUATION_BITPOS = 2,
151
152 // Heap is under updating: needs SVRB/SVWB barriers.
153 UPDATEREFS_BITPOS = 3,
154
155 // Heap is under partial collection
156 PARTIAL_BITPOS = 4,
157
158 // Heap is under traversal collection
159 TRAVERSAL_BITPOS = 5,
160 };
161
162 enum GCState {
163 STABLE = 0,
164 HAS_FORWARDED = 1 << HAS_FORWARDED_BITPOS,
165 MARKING = 1 << MARKING_BITPOS,
166 EVACUATION = 1 << EVACUATION_BITPOS,
167 UPDATEREFS = 1 << UPDATEREFS_BITPOS,
168 PARTIAL = 1 << PARTIAL_BITPOS,
169 TRAVERSAL = 1 << TRAVERSAL_BITPOS,
170 };
171
172 enum ShenandoahDegenerationPoint {
173 _degenerated_partial,
174 _degenerated_traversal,
175 _degenerated_outside_cycle,
176 _degenerated_mark,
177 _degenerated_evac,
178 _degenerated_updaterefs,
179 };
180
181 static const char* degen_point_to_string(ShenandoahDegenerationPoint point) {
182 switch (point) {
183 case _degenerated_partial:
184 return "Partial";
185 case _degenerated_traversal:
186 return "Traversal";
187 case _degenerated_outside_cycle:
188 return "Outside of Cycle";
189 case _degenerated_mark:
190 return "Mark";
191 case _degenerated_evac:
192 return "Evacuation";
193 case _degenerated_updaterefs:
194 return "Update Refs";
195 default:
196 ShouldNotReachHere();
197 return "ERROR";
198 }
199 };
200
201 private:
202 ShenandoahSharedBitmap _gc_state;
203 ShenandoahHeapLock _lock;
204 ShenandoahCollectorPolicy* _shenandoah_policy;
205 size_t _bitmap_size;
206 size_t _bitmap_regions_per_slice;
207 size_t _bitmap_bytes_per_slice;
208 MemRegion _heap_region;
209 MemRegion _bitmap0_region;
210 MemRegion _bitmap1_region;
211 MemRegion _aux_bitmap_region;
212
213 // Sortable array of regions
214 ShenandoahHeapRegionSet* _ordered_regions;
215 ShenandoahFreeSet* _free_regions;
216 ShenandoahCollectionSet* _collection_set;
217
218 ShenandoahConcurrentMark* _scm;
219 ShenandoahMarkCompact* _full_gc;
220 ShenandoahPartialGC* _partial_gc;
221 ShenandoahTraversalGC* _traversal_gc;
222 ShenandoahVerifier* _verifier;
223
224 ShenandoahConcurrentThread* _concurrent_gc_thread;
225
226 ShenandoahMonitoringSupport* _monitoring_support;
227
228 ShenandoahPhaseTimings* _phase_timings;
229 ShenandoahAllocTracker* _alloc_tracker;
230
231 size_t _num_regions;
232 size_t _initial_size;
233
234 uint _max_workers;
235 ShenandoahWorkGang* _workers;
236 ShenandoahWorkGang* _safepoint_workers;
237
238 volatile size_t _used;
239 volatile size_t _committed;
240
241 MarkBitMap _verification_bit_map;
242 MarkBitMap _mark_bit_map0;
243 MarkBitMap _mark_bit_map1;
244 MarkBitMap* _complete_mark_bit_map;
245 MarkBitMap* _next_mark_bit_map;
246 MarkBitMap _aux_bit_map;
247
248 HeapWord** _complete_top_at_mark_starts;
249 HeapWord** _complete_top_at_mark_starts_base;
250
251 HeapWord** _next_top_at_mark_starts;
252 HeapWord** _next_top_at_mark_starts_base;
253
254 size_t _bytes_allocated_since_cm;
255 size_t _bytes_allocated_during_cm;
256 size_t _allocated_last_gc;
257 size_t _used_start_gc;
258
259 ShenandoahSharedFlag _degenerated_gc_in_progress;
260 ShenandoahSharedFlag _full_gc_in_progress;
261 ShenandoahSharedFlag _full_gc_move_in_progress;
262
263 ShenandoahSharedFlag _inject_alloc_failure;
264
265 ShenandoahSharedEnumFlag<CancelState> _cancelled_concgc;
266
267 ReferenceProcessor* _ref_processor;
268
269 ShenandoahForwardedIsAliveClosure _forwarded_is_alive;
270 ShenandoahIsAliveClosure _is_alive;
271
272 ConcurrentGCTimer* _gc_timer;
273
274 ShenandoahConnectionMatrix* _connection_matrix;
275
276 GCMemoryManager _minor_memory_manager;
277 GCMemoryManager _major_memory_manager;
278
279 MemoryPool* _memory_pool;
280 MemoryPool* _dummy_pool;
281
282 #ifdef ASSERT
283 int _heap_expansion_count;
284 #endif
285
286 public:
287 ShenandoahHeap(ShenandoahCollectorPolicy* policy);
288
289 const char* name() const /* override */;
290 HeapWord* allocate_new_tlab(size_t word_size) /* override */;
291 void print_on(outputStream* st) const /* override */;
292 void print_extended_on(outputStream *st) const /* override */;
293
294 ShenandoahHeap::Name kind() const /* override */{
295 return CollectedHeap::ShenandoahHeap;
296 }
297
298 jint initialize() /* override */;
299 void post_initialize() /* override */;
300 size_t capacity() const /* override */;
301 size_t used() const /* override */;
302 size_t committed() const;
303 bool is_maximal_no_gc() const /* override */;
304 size_t max_capacity() const /* override */;
305 size_t initial_capacity() const /* override */;
306 bool is_in(const void* p) const /* override */;
307 bool is_scavengable(oop obj) /* override */;
308 HeapWord* mem_allocate(size_t size, bool* what) /* override */;
309 bool can_elide_tlab_store_barriers() const /* override */;
310 oop new_store_pre_barrier(JavaThread* thread, oop new_obj) /* override */;
311 bool can_elide_initializing_store_barrier(oop new_obj) /* override */;
312 bool card_mark_must_follow_store() const /* override */;
313 void collect(GCCause::Cause cause) /* override */;
314 void do_full_collection(bool clear_all_soft_refs) /* override */;
315 AdaptiveSizePolicy* size_policy() /* override */;
316 CollectorPolicy* collector_policy() const /* override */;
317 void ensure_parsability(bool retire_tlabs) /* override */;
318 HeapWord* block_start(const void* addr) const /* override */;
319 size_t block_size(const HeapWord* addr) const /* override */;
320 bool block_is_obj(const HeapWord* addr) const /* override */;
321 jlong millis_since_last_gc() /* override */;
322 void prepare_for_verify() /* override */;
323 void print_gc_threads_on(outputStream* st) const /* override */;
324 void gc_threads_do(ThreadClosure* tcl) const /* override */;
325 void print_tracing_info() const /* override */;
326 void verify(VerifyOption vo) /* override */;
327 bool supports_tlab_allocation() const /* override */;
328 size_t tlab_capacity(Thread *thr) const /* override */;
329 void object_iterate(ObjectClosure* cl) /* override */;
330 void safe_object_iterate(ObjectClosure* cl) /* override */;
331 size_t unsafe_max_tlab_alloc(Thread *thread) const /* override */;
332 size_t max_tlab_size() const /* override */;
333 void resize_all_tlabs() /* override */;
334 void accumulate_statistics_all_gclabs() /* override */;
335 HeapWord* tlab_post_allocation_setup(HeapWord* obj) /* override */;
336 uint oop_extra_words() /* override */;
337 size_t tlab_used(Thread* ignored) const /* override */;
338 void stop() /* override */;
339 virtual void safepoint_synchronize_begin();
340 virtual void safepoint_synchronize_end();
341
342 WorkGang* get_safepoint_workers() { return _safepoint_workers; }
343
344 #ifndef CC_INTERP
345 void compile_prepare_oop(MacroAssembler* masm, Register obj) /* override */;
346 #endif
347
348 void register_nmethod(nmethod* nm);
349 void unregister_nmethod(nmethod* nm);
350
351 void pin_object(oop o) /* override */;
352 void unpin_object(oop o) /* override */;
353
354 static ShenandoahHeap* heap();
355 static ShenandoahHeap* heap_no_check();
356 static address in_cset_fast_test_addr();
357 static address cancelled_concgc_addr();
358 static address gc_state_addr();
359
360 ShenandoahCollectorPolicy *shenandoahPolicy() const { return _shenandoah_policy; }
361 ShenandoahPhaseTimings* phase_timings() const { return _phase_timings; }
362 ShenandoahAllocTracker* alloc_tracker() const { return _alloc_tracker; }
363
364 inline ShenandoahHeapRegion* heap_region_containing(const void* addr) const;
365 inline size_t heap_region_index_containing(const void* addr) const;
366 inline bool requires_marking(const void* entry) const;
367
368 template <class T>
369 inline oop evac_update_with_forwarded(T* p, bool &evac);
370
371 template <class T>
372 inline oop maybe_update_with_forwarded(T* p);
373
374 template <class T>
375 inline oop maybe_update_with_forwarded_not_null(T* p, oop obj);
376
377 template <class T>
378 inline oop update_with_forwarded_not_null(T* p, oop obj);
379
380 void trash_cset_regions();
381
382 void stop_concurrent_marking();
383
384 void prepare_for_concurrent_evacuation();
385 void evacuate_and_update_roots();
386 // Fixup roots after concurrent cycle failed
387 void fixup_roots();
388
389 void update_heap_references(ShenandoahHeapRegionSet* regions, bool concurrent);
390
391 void roots_iterate(OopClosure* cl);
392
393 private:
394 void set_gc_state_mask(uint mask, bool value);
395 void set_gc_state_mask_concurrently(uint mask, bool value);
396
397 public:
398 void set_concurrent_mark_in_progress(bool in_progress);
399 void set_evacuation_in_progress_concurrently(bool in_progress);
400 void set_evacuation_in_progress_at_safepoint(bool in_progress);
401 void set_update_refs_in_progress(bool in_progress);
402 void set_degenerated_gc_in_progress(bool in_progress);
403 void set_full_gc_in_progress(bool in_progress);
404 void set_full_gc_move_in_progress(bool in_progress);
405 void set_concurrent_partial_in_progress(bool in_progress);
406 void set_concurrent_traversal_in_progress(bool in_progress);
407 void set_has_forwarded_objects(bool cond);
408
409 inline bool is_stable() const;
410 inline bool is_concurrent_mark_in_progress() const;
411 inline bool is_update_refs_in_progress() const;
412 inline bool is_evacuation_in_progress() const;
413 inline bool is_degenerated_gc_in_progress() const;
414 inline bool is_full_gc_in_progress() const;
415 inline bool is_full_gc_move_in_progress() const;
416 inline bool is_concurrent_partial_in_progress() const;
417 inline bool is_concurrent_traversal_in_progress() const;
418 inline bool has_forwarded_objects() const;
419 inline bool is_gc_in_progress_mask(uint mask) const;
420
421 inline bool region_in_collection_set(size_t region_index) const;
422
423 // Mainly there to avoid accidentally calling the templated
424 // method below with ShenandoahHeapRegion* which would be *wrong*.
425 inline bool in_collection_set(ShenandoahHeapRegion* r) const;
426
427 template <class T>
428 inline bool in_collection_set(T obj) const;
429
430 inline bool allocated_after_next_mark_start(HeapWord* addr) const;
431 void set_next_top_at_mark_start(HeapWord* region_base, HeapWord* addr);
432 HeapWord* next_top_at_mark_start(HeapWord* region_base);
433
434 inline bool allocated_after_complete_mark_start(HeapWord* addr) const;
435 void set_complete_top_at_mark_start(HeapWord* region_base, HeapWord* addr);
436 HeapWord* complete_top_at_mark_start(HeapWord* region_base);
437
438 // Evacuates object src. Returns the evacuated object if this thread
439 // succeeded, otherwise rolls back the evacuation and returns the
440 // evacuated object by the competing thread. 'succeeded' is an out
441 // param and set to true if this thread succeeded, otherwise to false.
442 inline oop evacuate_object(oop src, Thread* thread, bool& evacuated, bool from_write_barrier = false);
443 inline bool cancelled_concgc() const;
444 inline bool check_cancelled_concgc_and_yield(bool sts_active = true);
445 inline bool try_cancel_concgc();
446 inline void clear_cancelled_concgc();
447
448 ShenandoahHeapRegionSet* regions() const { return _ordered_regions;}
449 ShenandoahFreeSet* free_regions() const { return _free_regions; }
450 ShenandoahCollectionSet* collection_set() const { return _collection_set; }
451 void clear_free_regions();
452 void add_free_region(ShenandoahHeapRegion* r);
453
454 ShenandoahConnectionMatrix* connection_matrix() const;
455
456 void increase_used(size_t bytes);
457 void decrease_used(size_t bytes);
458
459 void set_used(size_t bytes);
460
461 void increase_committed(size_t bytes);
462 void decrease_committed(size_t bytes);
463
464 void handle_heap_shrinkage();
465
466 size_t garbage();
467
468 void reset_next_mark_bitmap();
469 void reset_complete_mark_bitmap();
470
471 MarkBitMap* complete_mark_bit_map();
472 MarkBitMap* next_mark_bit_map();
473 inline bool is_marked_complete(oop obj) const;
474 inline bool mark_next(oop obj) const;
475 inline bool is_marked_next(oop obj) const;
476 bool is_next_bitmap_clear();
477 bool is_next_bitmap_clear_range(HeapWord* start, HeapWord* end);
478 bool is_complete_bitmap_clear_range(HeapWord* start, HeapWord* end);
479
480 bool commit_bitmap_slice(ShenandoahHeapRegion *r);
481 bool uncommit_bitmap_slice(ShenandoahHeapRegion *r);
482
483 // Hint that the bitmap slice is not needed
484 bool idle_bitmap_slice(ShenandoahHeapRegion* r);
485 void activate_bitmap_slice(ShenandoahHeapRegion* r);
486
487 bool is_bitmap_slice_committed(ShenandoahHeapRegion* r, bool skip_self = false);
488
489 void print_heap_regions_on(outputStream* st) const;
490
491 size_t bytes_allocated_since_cm();
492 void set_bytes_allocated_since_cm(size_t bytes);
493
494 size_t trash_humongous_region_at(ShenandoahHeapRegion *r);
495
496 virtual GrowableArray<GCMemoryManager*> memory_managers();
497 virtual GrowableArray<MemoryPool*> memory_pools();
498
499 ShenandoahMonitoringSupport* monitoring_support();
500 ShenandoahConcurrentMark* concurrentMark() { return _scm; }
501 ShenandoahMarkCompact* full_gc() { return _full_gc; }
502 ShenandoahPartialGC* partial_gc();
503 ShenandoahTraversalGC* traversal_gc();
504 ShenandoahVerifier* verifier();
505
506 ReferenceProcessor* ref_processor() { return _ref_processor;}
507
508 WorkGang* workers() const { return _workers;}
509
510 uint max_workers();
511
512 void assert_gc_workers(uint nworker) PRODUCT_RETURN;
513
514 void do_evacuation();
515 ShenandoahHeapRegion* next_compaction_region(const ShenandoahHeapRegion* r);
516
517 void heap_region_iterate(ShenandoahHeapRegionClosure* blk, bool skip_cset_regions = false, bool skip_humongous_continuation = false) const;
518
519 // Delete entries for dead interned string and clean up unreferenced symbols
520 // in symbol table, possibly in parallel.
521 void unload_classes_and_cleanup_tables(bool full_gc);
522
523 inline size_t num_regions() const { return _num_regions; }
524
525 BoolObjectClosure* is_alive_closure();
526
527 private:
528 template<class T>
529 inline void marked_object_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit);
530
531 template<class T>
532 inline void marked_object_oop_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit);
533
534 public:
535 template<class T>
536 inline void marked_object_iterate(ShenandoahHeapRegion* region, T* cl);
537
538 template<class T>
539 inline void marked_object_safe_iterate(ShenandoahHeapRegion* region, T* cl);
540
541 template<class T>
542 inline void marked_object_oop_iterate(ShenandoahHeapRegion* region, T* cl);
543
544 template<class T>
545 inline void marked_object_oop_safe_iterate(ShenandoahHeapRegion* region, T* cl);
546
547 GCTimer* gc_timer() const;
548
549 void swap_mark_bitmaps();
550
551 void cancel_concgc(GCCause::Cause cause);
552
553 ShenandoahHeapLock* lock() { return &_lock; }
554 void assert_heaplock_owned_by_current_thread() PRODUCT_RETURN;
555 void assert_heaplock_not_owned_by_current_thread() PRODUCT_RETURN;
556 void assert_heaplock_or_safepoint() PRODUCT_RETURN;
557
558 public:
559 typedef enum {
560 _alloc_shared, // Allocate common, outside of TLAB
561 _alloc_shared_gc, // Allocate common, outside of GCLAB
562 _alloc_tlab, // Allocate TLAB
563 _alloc_gclab, // Allocate GCLAB
564 _ALLOC_LIMIT,
565 } AllocType;
566
567 static const char* alloc_type_to_string(AllocType type) {
568 switch (type) {
569 case _alloc_shared:
570 return "Shared";
571 case _alloc_shared_gc:
572 return "Shared GC";
573 case _alloc_tlab:
574 return "TLAB";
575 case _alloc_gclab:
576 return "GCLAB";
577 default:
578 ShouldNotReachHere();
579 return "";
580 }
581 }
582 private:
583
584 virtual void initialize_serviceability();
585
586 HeapWord* allocate_new_lab(size_t word_size, AllocType type);
587 HeapWord* allocate_memory_under_lock(size_t word_size, AllocType type, bool &new_region);
588 HeapWord* allocate_memory(size_t word_size, AllocType type);
589 // Shenandoah functionality.
590 inline HeapWord* allocate_from_gclab(Thread* thread, size_t size);
591 HeapWord* allocate_from_gclab_slow(Thread* thread, size_t size);
592 HeapWord* allocate_new_gclab(size_t word_size);
593
594 template<class T>
595 inline void do_marked_object(MarkBitMap* bitmap, T* cl, oop obj);
596
597 ShenandoahConcurrentThread* concurrent_thread() { return _concurrent_gc_thread; }
598
599 inline bool mark_next_no_checks(oop obj) const;
600
601 public:
602 inline oop atomic_compare_exchange_oop(oop n, narrowOop* addr, oop c);
603 inline oop atomic_compare_exchange_oop(oop n, oop* addr, oop c);
604
605 private:
606 void ref_processing_init();
607
608 GCTracer* tracer();
609
610 private:
611 uint64_t _alloc_seq_at_last_gc_start;
612 uint64_t _alloc_seq_at_last_gc_end;
613 size_t _used_at_last_gc;
614
615 public:
616 void recycle_trash_assist(size_t limit);
617 void recycle_trash();
618
619 uint64_t alloc_seq_at_last_gc_end() const { return _alloc_seq_at_last_gc_end; }
620 uint64_t alloc_seq_at_last_gc_start() const { return _alloc_seq_at_last_gc_start;}
621 size_t used_at_last_gc() const { return _used_at_last_gc;}
622
623 void set_alloc_seq_gc_start();
624 void set_alloc_seq_gc_end();
625
626 void set_used_at_last_gc() {_used_at_last_gc = used();}
627
628 void make_tlabs_parsable(bool retire_tlabs) /* override */;
629
630 GCMemoryManager* major_memory_manager() { return &_major_memory_manager; }
631 GCMemoryManager* minor_memory_manager() { return &_minor_memory_manager; }
632
633 public:
634 // Entry points to STW GC operations, these cause a related safepoint, that then
635 // call the entry method below
636 void vmop_entry_init_mark();
637 void vmop_entry_final_mark();
638 void vmop_entry_init_updaterefs();
639 void vmop_entry_final_updaterefs();
640 void vmop_entry_init_partial();
641 void vmop_entry_final_partial();
642 void vmop_entry_init_traversal();
643 void vmop_entry_final_traversal();
644 void vmop_entry_full(GCCause::Cause cause);
645 void vmop_entry_verify_after_evac();
646 void vmop_degenerated(ShenandoahDegenerationPoint point);
647
648 // Entry methods to normally STW GC operations. These set up logging, monitoring
649 // and workers for net VM operation
650 void entry_init_mark();
651 void entry_final_mark();
652 void entry_init_updaterefs();
653 void entry_final_updaterefs();
654 void entry_init_partial();
655 void entry_final_partial();
656 void entry_init_traversal();
657 void entry_final_traversal();
658 void entry_full(GCCause::Cause cause);
659 void entry_verify_after_evac();
660 void entry_degenerated(int point);
661
662 // Entry methods to normally concurrent GC operations. These set up logging, monitoring
663 // for concurrent operation.
664 void entry_mark();
665 void entry_preclean();
666 void entry_cleanup();
667 void entry_cleanup_bitmaps();
668 void entry_evac();
669 void entry_updaterefs();
670 void entry_partial();
671 void entry_traversal();
672
673 private:
674 // Actual work for the phases
675 void op_init_mark();
676 void op_final_mark();
677 void op_init_updaterefs();
678 void op_final_updaterefs();
679 void op_init_partial();
680 void op_final_partial();
681 void op_init_traversal();
682 void op_final_traversal();
683 void op_full(GCCause::Cause cause);
684 void op_verify_after_evac();
685 void op_degenerated(ShenandoahDegenerationPoint point);
686 void op_degenerated_fail();
687 void op_degenerated_futile();
688
689 void op_mark();
690 void op_preclean();
691 void op_cleanup();
692 void op_evac();
693 void op_updaterefs();
694 void op_cleanup_bitmaps();
695 void op_partial();
696 void op_traversal();
697
698 private:
699 void try_inject_alloc_failure();
700 bool should_inject_alloc_failure();
701 };
702
703 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHHEAP_HPP