1 /* 2 * Copyright (c) 2013, 2019, Red Hat, Inc. All rights reserved. 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_GC_SHENANDOAH_SHENANDOAHHEAP_HPP 25 #define SHARE_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/shenandoahAsserts.hpp" 31 #include "gc/shenandoah/shenandoahAllocRequest.hpp" 32 #include "gc/shenandoah/shenandoahLock.hpp" 33 #include "gc/shenandoah/shenandoahEvacOOMHandler.hpp" 34 #include "gc/shenandoah/shenandoahSharedVariables.hpp" 35 #include "services/memoryManager.hpp" 36 37 class ConcurrentGCTimer; 38 class ReferenceProcessor; 39 class ShenandoahAllocTracker; 40 class ShenandoahCollectorPolicy; 41 class ShenandoahControlThread; 42 class ShenandoahGCSession; 43 class ShenandoahGCStateResetter; 44 class ShenandoahHeuristics; 45 class ShenandoahMarkingContext; 46 class ShenandoahPhaseTimings; 47 class ShenandoahHeap; 48 class ShenandoahHeapRegion; 49 class ShenandoahHeapRegionClosure; 50 class ShenandoahCollectionSet; 51 class ShenandoahFreeSet; 52 class ShenandoahConcurrentMark; 53 class ShenandoahMarkCompact; 54 class ShenandoahMonitoringSupport; 55 class ShenandoahPacer; 56 class ShenandoahTraversalGC; 57 class ShenandoahVerifier; 58 class ShenandoahWorkGang; 59 class VMStructs; 60 61 class ShenandoahRegionIterator : public StackObj { 62 private: 63 ShenandoahHeap* _heap; 64 65 DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t)); 66 volatile size_t _index; 67 DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0); 68 69 // No implicit copying: iterators should be passed by reference to capture the state 70 ShenandoahRegionIterator(const ShenandoahRegionIterator& that); 71 ShenandoahRegionIterator& operator=(const ShenandoahRegionIterator& o); 72 73 public: 74 ShenandoahRegionIterator(); 75 ShenandoahRegionIterator(ShenandoahHeap* heap); 76 77 // Reset iterator to default state 78 void reset(); 79 80 // Returns next region, or NULL if there are no more regions. 81 // This is multi-thread-safe. 82 inline ShenandoahHeapRegion* next(); 83 84 // This is *not* MT safe. However, in the absence of multithreaded access, it 85 // can be used to determine if there is more work to do. 86 bool has_next() const; 87 }; 88 89 class ShenandoahHeapRegionClosure : public StackObj { 90 public: 91 virtual void heap_region_do(ShenandoahHeapRegion* r) = 0; 92 virtual bool is_thread_safe() { return false; } 93 }; 94 95 #ifdef ASSERT 96 class ShenandoahAssertToSpaceClosure : public OopClosure { 97 private: 98 template <class T> 99 void do_oop_work(T* p); 100 public: 101 void do_oop(narrowOop* p); 102 void do_oop(oop* p); 103 }; 104 #endif 105 106 typedef ShenandoahLock ShenandoahHeapLock; 107 typedef ShenandoahLocker ShenandoahHeapLocker; 108 109 // Shenandoah GC is low-pause concurrent GC that uses Brooks forwarding pointers 110 // to encode forwarding data. See BrooksPointer for details on forwarding data encoding. 111 // See ShenandoahControlThread for GC cycle structure. 112 // 113 class ShenandoahHeap : public CollectedHeap { 114 friend class ShenandoahAsserts; 115 friend class VMStructs; 116 friend class ShenandoahGCSession; 117 friend class ShenandoahGCStateResetter; 118 119 // ---------- Locks that guard important data structures in Heap 120 // 121 private: 122 ShenandoahHeapLock _lock; 123 124 public: 125 ShenandoahHeapLock* lock() { 126 return &_lock; 127 } 128 129 void assert_heaplock_owned_by_current_thread() NOT_DEBUG_RETURN; 130 void assert_heaplock_not_owned_by_current_thread() NOT_DEBUG_RETURN; 131 void assert_heaplock_or_safepoint() NOT_DEBUG_RETURN; 132 133 // ---------- Initialization, termination, identification, printing routines 134 // 135 public: 136 static ShenandoahHeap* heap(); 137 static ShenandoahHeap* heap_no_check(); 138 139 const char* name() const { return "Shenandoah"; } 140 ShenandoahHeap::Name kind() const { return CollectedHeap::Shenandoah; } 141 142 ShenandoahHeap(ShenandoahCollectorPolicy* policy); 143 jint initialize(); 144 void post_initialize(); 145 void initialize_heuristics(); 146 147 void initialize_serviceability(); 148 149 void print_on(outputStream* st) const; 150 void print_extended_on(outputStream *st) const; 151 void print_tracing_info() const; 152 void print_gc_threads_on(outputStream* st) const; 153 void print_heap_regions_on(outputStream* st) const; 154 155 void stop(); 156 157 void prepare_for_verify(); 158 void verify(VerifyOption vo); 159 160 // ---------- Heap counters and metrics 161 // 162 private: 163 size_t _initial_size; 164 size_t _minimum_size; 165 DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile size_t)); 166 volatile size_t _used; 167 volatile size_t _committed; 168 volatile size_t _bytes_allocated_since_gc_start; 169 DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0); 170 171 public: 172 void increase_used(size_t bytes); 173 void decrease_used(size_t bytes); 174 void set_used(size_t bytes); 175 176 void increase_committed(size_t bytes); 177 void decrease_committed(size_t bytes); 178 void increase_allocated(size_t bytes); 179 180 size_t bytes_allocated_since_gc_start(); 181 void reset_bytes_allocated_since_gc_start(); 182 183 size_t min_capacity() const; 184 size_t max_capacity() const; 185 size_t initial_capacity() const; 186 size_t capacity() const; 187 size_t used() const; 188 size_t committed() const; 189 190 // ---------- Workers handling 191 // 192 private: 193 uint _max_workers; 194 ShenandoahWorkGang* _workers; 195 ShenandoahWorkGang* _safepoint_workers; 196 197 public: 198 uint max_workers(); 199 void assert_gc_workers(uint nworker) NOT_DEBUG_RETURN; 200 201 WorkGang* workers() const; 202 WorkGang* get_safepoint_workers(); 203 204 void gc_threads_do(ThreadClosure* tcl) const; 205 206 // ---------- Heap regions handling machinery 207 // 208 private: 209 MemRegion _heap_region; 210 bool _heap_region_special; 211 size_t _num_regions; 212 ShenandoahHeapRegion** _regions; 213 ShenandoahRegionIterator _update_refs_iterator; 214 215 public: 216 inline size_t num_regions() const { return _num_regions; } 217 inline bool is_heap_region_special() { return _heap_region_special; } 218 219 inline ShenandoahHeapRegion* const heap_region_containing(const void* addr) const; 220 inline size_t heap_region_index_containing(const void* addr) const; 221 222 inline ShenandoahHeapRegion* const get_region(size_t region_idx) const; 223 224 void heap_region_iterate(ShenandoahHeapRegionClosure* blk) const; 225 void parallel_heap_region_iterate(ShenandoahHeapRegionClosure* blk) const; 226 227 // ---------- GC state machinery 228 // 229 // GC state describes the important parts of collector state, that may be 230 // used to make barrier selection decisions in the native and generated code. 231 // Multiple bits can be set at once. 232 // 233 // Important invariant: when GC state is zero, the heap is stable, and no barriers 234 // are required. 235 // 236 public: 237 enum GCStateBitPos { 238 // Heap has forwarded objects: needs LRB barriers. 239 HAS_FORWARDED_BITPOS = 0, 240 241 // Heap is under marking: needs SATB barriers. 242 MARKING_BITPOS = 1, 243 244 // Heap is under evacuation: needs LRB barriers. (Set together with HAS_FORWARDED) 245 EVACUATION_BITPOS = 2, 246 247 // Heap is under updating: needs no additional barriers. 248 UPDATEREFS_BITPOS = 3, 249 250 // Heap is under traversal collection 251 TRAVERSAL_BITPOS = 4 252 }; 253 254 enum GCState { 255 STABLE = 0, 256 HAS_FORWARDED = 1 << HAS_FORWARDED_BITPOS, 257 MARKING = 1 << MARKING_BITPOS, 258 EVACUATION = 1 << EVACUATION_BITPOS, 259 UPDATEREFS = 1 << UPDATEREFS_BITPOS, 260 TRAVERSAL = 1 << TRAVERSAL_BITPOS 261 }; 262 263 private: 264 ShenandoahSharedBitmap _gc_state; 265 ShenandoahSharedFlag _degenerated_gc_in_progress; 266 ShenandoahSharedFlag _full_gc_in_progress; 267 ShenandoahSharedFlag _full_gc_move_in_progress; 268 ShenandoahSharedFlag _progress_last_gc; 269 270 void set_gc_state_all_threads(char state); 271 void set_gc_state_mask(uint mask, bool value); 272 273 public: 274 char gc_state() const; 275 static address gc_state_addr(); 276 277 void set_concurrent_mark_in_progress(bool in_progress); 278 void set_evacuation_in_progress(bool in_progress); 279 void set_update_refs_in_progress(bool in_progress); 280 void set_degenerated_gc_in_progress(bool in_progress); 281 void set_full_gc_in_progress(bool in_progress); 282 void set_full_gc_move_in_progress(bool in_progress); 283 void set_concurrent_traversal_in_progress(bool in_progress); 284 void set_has_forwarded_objects(bool cond); 285 286 inline bool is_stable() const; 287 inline bool is_idle() const; 288 inline bool is_concurrent_mark_in_progress() const; 289 inline bool is_update_refs_in_progress() const; 290 inline bool is_evacuation_in_progress() const; 291 inline bool is_degenerated_gc_in_progress() const; 292 inline bool is_full_gc_in_progress() const; 293 inline bool is_full_gc_move_in_progress() const; 294 inline bool is_concurrent_traversal_in_progress() const; 295 inline bool has_forwarded_objects() const; 296 inline bool is_gc_in_progress_mask(uint mask) const; 297 298 // ---------- GC cancellation and degeneration machinery 299 // 300 // Cancelled GC flag is used to notify concurrent phases that they should terminate. 301 // 302 public: 303 enum ShenandoahDegenPoint { 304 _degenerated_unset, 305 _degenerated_traversal, 306 _degenerated_outside_cycle, 307 _degenerated_mark, 308 _degenerated_evac, 309 _degenerated_updaterefs, 310 _DEGENERATED_LIMIT 311 }; 312 313 static const char* degen_point_to_string(ShenandoahDegenPoint point) { 314 switch (point) { 315 case _degenerated_unset: 316 return "<UNSET>"; 317 case _degenerated_traversal: 318 return "Traversal"; 319 case _degenerated_outside_cycle: 320 return "Outside of Cycle"; 321 case _degenerated_mark: 322 return "Mark"; 323 case _degenerated_evac: 324 return "Evacuation"; 325 case _degenerated_updaterefs: 326 return "Update Refs"; 327 default: 328 ShouldNotReachHere(); 329 return "ERROR"; 330 } 331 }; 332 333 private: 334 enum CancelState { 335 // Normal state. GC has not been cancelled and is open for cancellation. 336 // Worker threads can suspend for safepoint. 337 CANCELLABLE, 338 339 // GC has been cancelled. Worker threads can not suspend for 340 // safepoint but must finish their work as soon as possible. 341 CANCELLED, 342 343 // GC has not been cancelled and must not be cancelled. At least 344 // one worker thread checks for pending safepoint and may suspend 345 // if a safepoint is pending. 346 NOT_CANCELLED 347 }; 348 349 ShenandoahSharedEnumFlag<CancelState> _cancelled_gc; 350 bool try_cancel_gc(); 351 352 public: 353 static address cancelled_gc_addr(); 354 355 inline bool cancelled_gc() const; 356 inline bool check_cancelled_gc_and_yield(bool sts_active = true); 357 358 inline void clear_cancelled_gc(); 359 360 void cancel_gc(GCCause::Cause cause); 361 362 // ---------- GC operations entry points 363 // 364 public: 365 // Entry points to STW GC operations, these cause a related safepoint, that then 366 // call the entry method below 367 void vmop_entry_init_mark(); 368 void vmop_entry_final_mark(); 369 void vmop_entry_final_evac(); 370 void vmop_entry_init_updaterefs(); 371 void vmop_entry_final_updaterefs(); 372 void vmop_entry_init_traversal(); 373 void vmop_entry_final_traversal(); 374 void vmop_entry_full(GCCause::Cause cause); 375 void vmop_degenerated(ShenandoahDegenPoint point); 376 377 // Entry methods to normally STW GC operations. These set up logging, monitoring 378 // and workers for net VM operation 379 void entry_init_mark(); 380 void entry_final_mark(); 381 void entry_final_evac(); 382 void entry_init_updaterefs(); 383 void entry_final_updaterefs(); 384 void entry_init_traversal(); 385 void entry_final_traversal(); 386 void entry_full(GCCause::Cause cause); 387 void entry_degenerated(int point); 388 389 // Entry methods to normally concurrent GC operations. These set up logging, monitoring 390 // for concurrent operation. 391 void entry_reset(); 392 void entry_mark(); 393 void entry_preclean(); 394 void entry_concurrent_roots(); 395 void entry_cleanup(); 396 void entry_evac(); 397 void entry_updaterefs(); 398 void entry_traversal(); 399 void entry_uncommit(double shrink_before); 400 401 private: 402 // Actual work for the phases 403 void op_init_mark(); 404 void op_final_mark(); 405 void op_final_evac(); 406 void op_init_updaterefs(); 407 void op_final_updaterefs(); 408 void op_init_traversal(); 409 void op_final_traversal(); 410 void op_full(GCCause::Cause cause); 411 void op_degenerated(ShenandoahDegenPoint point); 412 void op_degenerated_fail(); 413 void op_degenerated_futile(); 414 415 void op_reset(); 416 void op_mark(); 417 void op_preclean(); 418 void op_concurrent_roots(); 419 void op_cleanup(); 420 void op_conc_evac(); 421 void op_stw_evac(); 422 void op_updaterefs(); 423 void op_traversal(); 424 void op_uncommit(double shrink_before); 425 426 // Messages for GC trace events, they have to be immortal for 427 // passing around the logging/tracing systems 428 const char* init_mark_event_message() const; 429 const char* final_mark_event_message() const; 430 const char* conc_mark_event_message() const; 431 const char* degen_event_message(ShenandoahDegenPoint point) const; 432 433 // ---------- GC subsystems 434 // 435 private: 436 ShenandoahControlThread* _control_thread; 437 ShenandoahCollectorPolicy* _shenandoah_policy; 438 ShenandoahHeuristics* _heuristics; 439 ShenandoahFreeSet* _free_set; 440 ShenandoahConcurrentMark* _scm; 441 ShenandoahTraversalGC* _traversal_gc; 442 ShenandoahMarkCompact* _full_gc; 443 ShenandoahPacer* _pacer; 444 ShenandoahVerifier* _verifier; 445 446 ShenandoahAllocTracker* _alloc_tracker; 447 ShenandoahPhaseTimings* _phase_timings; 448 449 ShenandoahControlThread* control_thread() { return _control_thread; } 450 ShenandoahMarkCompact* full_gc() { return _full_gc; } 451 452 public: 453 ShenandoahCollectorPolicy* shenandoah_policy() const { return _shenandoah_policy; } 454 ShenandoahHeuristics* heuristics() const { return _heuristics; } 455 ShenandoahFreeSet* free_set() const { return _free_set; } 456 ShenandoahConcurrentMark* concurrent_mark() { return _scm; } 457 ShenandoahTraversalGC* traversal_gc() { return _traversal_gc; } 458 ShenandoahPacer* pacer() const { return _pacer; } 459 460 ShenandoahPhaseTimings* phase_timings() const { return _phase_timings; } 461 ShenandoahAllocTracker* alloc_tracker() const { return _alloc_tracker; } 462 463 ShenandoahVerifier* verifier(); 464 465 // ---------- VM subsystem bindings 466 // 467 private: 468 ShenandoahMonitoringSupport* _monitoring_support; 469 MemoryPool* _memory_pool; 470 GCMemoryManager _stw_memory_manager; 471 GCMemoryManager _cycle_memory_manager; 472 ConcurrentGCTimer* _gc_timer; 473 SoftRefPolicy _soft_ref_policy; 474 475 // For exporting to SA 476 int _log_min_obj_alignment_in_bytes; 477 public: 478 ShenandoahMonitoringSupport* monitoring_support() { return _monitoring_support; } 479 GCMemoryManager* cycle_memory_manager() { return &_cycle_memory_manager; } 480 GCMemoryManager* stw_memory_manager() { return &_stw_memory_manager; } 481 SoftRefPolicy* soft_ref_policy() { return &_soft_ref_policy; } 482 483 GrowableArray<GCMemoryManager*> memory_managers(); 484 GrowableArray<MemoryPool*> memory_pools(); 485 MemoryUsage memory_usage(); 486 GCTracer* tracer(); 487 GCTimer* gc_timer() const; 488 489 // ---------- Reference processing 490 // 491 private: 492 AlwaysTrueClosure _subject_to_discovery; 493 ReferenceProcessor* _ref_processor; 494 ShenandoahSharedFlag _process_references; 495 496 void ref_processing_init(); 497 498 public: 499 ReferenceProcessor* ref_processor() { return _ref_processor; } 500 void set_process_references(bool pr); 501 bool process_references() const; 502 503 // ---------- Class Unloading 504 // 505 private: 506 ShenandoahSharedFlag _unload_classes; 507 508 public: 509 void set_unload_classes(bool uc); 510 bool unload_classes() const; 511 512 // Delete entries for dead interned string and clean up unreferenced symbols 513 // in symbol table, possibly in parallel. 514 void unload_classes_and_cleanup_tables(bool full_gc); 515 516 // ---------- Generic interface hooks 517 // Minor things that super-interface expects us to implement to play nice with 518 // the rest of runtime. Some of the things here are not required to be implemented, 519 // and can be stubbed out. 520 // 521 public: 522 AdaptiveSizePolicy* size_policy() shenandoah_not_implemented_return(NULL); 523 bool is_maximal_no_gc() const shenandoah_not_implemented_return(false); 524 525 bool is_in(const void* p) const; 526 527 void collect(GCCause::Cause cause); 528 void do_full_collection(bool clear_all_soft_refs); 529 530 // Used for parsing heap during error printing 531 HeapWord* block_start(const void* addr) const; 532 bool block_is_obj(const HeapWord* addr) const; 533 534 // Used for native heap walkers: heap dumpers, mostly 535 void object_iterate(ObjectClosure* cl); 536 void safe_object_iterate(ObjectClosure* cl); 537 538 // Used by RMI 539 jlong millis_since_last_gc(); 540 541 // ---------- Safepoint interface hooks 542 // 543 public: 544 void safepoint_synchronize_begin(); 545 void safepoint_synchronize_end(); 546 547 // ---------- Code roots handling hooks 548 // 549 public: 550 void register_nmethod(nmethod* nm); 551 void unregister_nmethod(nmethod* nm); 552 void flush_nmethod(nmethod* nm) {} 553 void verify_nmethod(nmethod* nm) {} 554 555 // ---------- Pinning hooks 556 // 557 public: 558 // Shenandoah supports per-object (per-region) pinning 559 bool supports_object_pinning() const { return true; } 560 561 oop pin_object(JavaThread* thread, oop obj); 562 void unpin_object(JavaThread* thread, oop obj); 563 564 // ---------- Allocation support 565 // 566 private: 567 HeapWord* allocate_memory_under_lock(ShenandoahAllocRequest& request, bool& in_new_region); 568 inline HeapWord* allocate_from_gclab(Thread* thread, size_t size); 569 HeapWord* allocate_from_gclab_slow(Thread* thread, size_t size); 570 HeapWord* allocate_new_gclab(size_t min_size, size_t word_size, size_t* actual_size); 571 void retire_and_reset_gclabs(); 572 573 public: 574 HeapWord* allocate_memory(ShenandoahAllocRequest& request); 575 HeapWord* mem_allocate(size_t size, bool* what); 576 MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data, 577 size_t size, 578 Metaspace::MetadataType mdtype); 579 580 void notify_mutator_alloc_words(size_t words, bool waste); 581 582 // Shenandoah supports TLAB allocation 583 bool supports_tlab_allocation() const { return true; } 584 585 HeapWord* allocate_new_tlab(size_t min_size, size_t requested_size, size_t* actual_size); 586 size_t tlab_capacity(Thread *thr) const; 587 size_t unsafe_max_tlab_alloc(Thread *thread) const; 588 size_t max_tlab_size() const; 589 size_t tlab_used(Thread* ignored) const; 590 591 void resize_tlabs(); 592 593 void ensure_parsability(bool retire_tlabs); 594 void make_parsable(bool retire_tlabs); 595 596 // ---------- Marking support 597 // 598 private: 599 ShenandoahMarkingContext* _marking_context; 600 MemRegion _bitmap_region; 601 MemRegion _aux_bitmap_region; 602 MarkBitMap _verification_bit_map; 603 MarkBitMap _aux_bit_map; 604 605 size_t _bitmap_size; 606 size_t _bitmap_regions_per_slice; 607 size_t _bitmap_bytes_per_slice; 608 609 bool _bitmap_region_special; 610 bool _aux_bitmap_region_special; 611 612 // Used for buffering per-region liveness data. 613 // Needed since ShenandoahHeapRegion uses atomics to update liveness. 614 // 615 // The array has max-workers elements, each of which is an array of 616 // jushort * max_regions. The choice of jushort is not accidental: 617 // there is a tradeoff between static/dynamic footprint that translates 618 // into cache pressure (which is already high during marking), and 619 // too many atomic updates. size_t/jint is too large, jbyte is too small. 620 jushort** _liveness_cache; 621 622 public: 623 inline ShenandoahMarkingContext* complete_marking_context() const; 624 inline ShenandoahMarkingContext* marking_context() const; 625 inline void mark_complete_marking_context(); 626 inline void mark_incomplete_marking_context(); 627 628 template<class T> 629 inline void marked_object_iterate(ShenandoahHeapRegion* region, T* cl); 630 631 template<class T> 632 inline void marked_object_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit); 633 634 template<class T> 635 inline void marked_object_oop_iterate(ShenandoahHeapRegion* region, T* cl, HeapWord* limit); 636 637 void reset_mark_bitmap(); 638 639 // SATB barriers hooks 640 template<bool RESOLVE> 641 inline bool requires_marking(const void* entry) const; 642 void force_satb_flush_all_threads(); 643 644 // Support for bitmap uncommits 645 bool commit_bitmap_slice(ShenandoahHeapRegion *r); 646 bool uncommit_bitmap_slice(ShenandoahHeapRegion *r); 647 bool is_bitmap_slice_committed(ShenandoahHeapRegion* r, bool skip_self = false); 648 649 // Liveness caching support 650 jushort* get_liveness_cache(uint worker_id); 651 void flush_liveness_cache(uint worker_id); 652 653 // ---------- Evacuation support 654 // 655 private: 656 ShenandoahCollectionSet* _collection_set; 657 ShenandoahEvacOOMHandler _oom_evac_handler; 658 659 void evacuate_and_update_roots(); 660 661 public: 662 static address in_cset_fast_test_addr(); 663 664 ShenandoahCollectionSet* collection_set() const { return _collection_set; } 665 666 template <class T> 667 inline bool in_collection_set(T obj) const; 668 669 // Avoid accidentally calling the method above with ShenandoahHeapRegion*, which would be *wrong*. 670 inline bool in_collection_set(ShenandoahHeapRegion* r) shenandoah_not_implemented_return(false); 671 672 // Evacuates object src. Returns the evacuated object, either evacuated 673 // by this thread, or by some other thread. 674 inline oop evacuate_object(oop src, Thread* thread); 675 676 // Call before/after evacuation. 677 void enter_evacuation(); 678 void leave_evacuation(); 679 680 // ---------- Helper functions 681 // 682 public: 683 template <class T> 684 inline oop evac_update_with_forwarded(T* p); 685 686 template <class T> 687 inline oop maybe_update_with_forwarded(T* p); 688 689 template <class T> 690 inline oop maybe_update_with_forwarded_not_null(T* p, oop obj); 691 692 template <class T> 693 inline oop update_with_forwarded_not_null(T* p, oop obj); 694 695 static inline oop cas_oop(oop n, narrowOop* addr, oop c); 696 static inline oop cas_oop(oop n, oop* addr, oop c); 697 698 void trash_humongous_region_at(ShenandoahHeapRegion *r); 699 700 void deduplicate_string(oop str); 701 702 void stop_concurrent_marking(); 703 704 private: 705 void trash_cset_regions(); 706 void update_heap_references(bool concurrent); 707 708 // ---------- Testing helpers functions 709 // 710 private: 711 ShenandoahSharedFlag _inject_alloc_failure; 712 713 void try_inject_alloc_failure(); 714 bool should_inject_alloc_failure(); 715 }; 716 717 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHHEAP_HPP