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psScavenge.hpp


products/Sources/formale Sprachen/JAVA/Openjdk/src/hotspot/share/gc/parallel/psScavenge.hpp

/* * Copyright (c) 2002, 2022, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_GC_PARALLEL_PSSCAVENGE_HPP #define SHARE_GC_PARALLEL_PSSCAVENGE_HPP #include "gc/parallel/psCardTable.hpp" #include "gc/parallel/psVirtualspace.hpp" #include "gc/shared/collectorCounters.hpp" #include "gc/shared/gcTrace.hpp" #include "memory/allStatic.hpp" #include "oops/oop.hpp" #include "utilities/stack.hpp" class OopStack; class ReferenceProcessor; class ParallelScavengeHeap; class ParallelScavengeTracer; class PSIsAliveClosure; class PSRefProcTaskExecutor; class STWGCTimer; class PSScavenge: AllStatic { friend class PSIsAliveClosure; friend class PSKeepAliveClosure; friend class PSPromotionManager; enum ScavengeSkippedCause { not_skipped = 0, to_space_not_empty, promoted_too_large, full_follows_scavenge }; protected: // Flags/counters static SpanSubjectToDiscoveryClosure _span_based_discoverer; static ReferenceProcessor* _ref_processor; // Reference processor for scavenging. static PSIsAliveClosure _is_alive_closure; // Closure used for reference processing static PSCardTable* _card_table; // We cache the card table for fast access. static bool _survivor_overflow; // Overflow this collection static uint _tenuring_threshold; // tenuring threshold for next scavenge static elapsedTimer _accumulated_time; // total time spent on scavenge static STWGCTimer _gc_timer; // GC time book keeper static ParallelScavengeTracer _gc_tracer; // GC tracing // The lowest address possible for the young_gen. // This is used to decide if an oop should be scavenged, // cards should be marked, etc. static HeapWord* _young_generation_boundary; // Used to optimize compressed oops young gen boundary checking. static uintptr_t _young_generation_boundary_compressed; static CollectorCounters* _counters; // collector performance counters static void clean_up_failed_promotion(); static bool should_attempt_scavenge(); // Private accessors static PSCardTable* const card_table() { assert(_card_table != NULL, "Sanity"); return _card_table; } static const ParallelScavengeTracer* gc_tracer() { return &_gc_tracer; } public: // Accessors static uint tenuring_threshold() { return _tenuring_threshold; } static elapsedTimer* accumulated_time() { return &_accumulated_time; } // Performance Counters static CollectorCounters* counters() { return _counters; } static void set_subject_to_discovery_span(MemRegion mr) { _span_based_discoverer.set_span(mr); } // Used by scavenge_contents static ReferenceProcessor* const reference_processor() { assert(_ref_processor != NULL, "Sanity"); return _ref_processor; } // The promotion managers tell us if they encountered overflow static void set_survivor_overflow(bool state) { _survivor_overflow = state; } // Adaptive size policy support. static void set_young_generation_boundary(HeapWord* v); // Called by parallelScavengeHeap to init the tenuring threshold static void initialize(); // Scavenge entry point. This may invoke a full gc; return true if so. static bool invoke(); // Return true if a collection was done; false otherwise. static bool invoke_no_policy(); template static inline bool should_scavenge(T* p); // These call should_scavenge() above and, if it returns true, also check that // the object was not newly copied into to_space. The version with the bool // argument is a convenience wrapper that fetches the to_space pointer from // the heap and calls the other version (if the arg is true). template static inline bool should_scavenge(T* p, MutableSpace* to_space); template static inline bool should_scavenge(T* p, bool check_to_space); // Is an object in the young generation // This assumes that the 'o' is in the heap, // so it only checks one side of the complete predicate. inline static bool is_obj_in_young(oop o) { return cast_from_oop(o) >= _young_generation_boundary; } inline static bool is_obj_in_young(narrowOop o) { return (uintptr_t)o >= _young_generation_boundary_compressed; } inline static bool is_obj_in_young(HeapWord* o) { return o >= _young_generation_boundary; } static bool is_obj_in_to_space(oop o) { return ParallelScavengeHeap::young_gen()->to_space()->contains(o); } }; #endif // SHARE_GC_PARALLEL_PSSCAVENGE_HPP

                                                                                                                                                                                                                                                                                                                                                                                                     

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