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