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