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