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