author | tschatzl |
Tue, 08 May 2018 16:49:20 +0200 | |
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/* |
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* Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_SHARED_REFERENCEPROCESSOR_HPP |
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#define SHARE_VM_GC_SHARED_REFERENCEPROCESSOR_HPP |
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#include "gc/shared/referenceDiscoverer.hpp" |
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#include "gc/shared/referencePolicy.hpp" |
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#include "gc/shared/referenceProcessorPhaseTimes.hpp" |
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#include "gc/shared/referenceProcessorStats.hpp" |
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#include "memory/referenceType.hpp" |
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#include "oops/instanceRefKlass.hpp" |
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class GCTimer; |
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// ReferenceProcessor class encapsulates the per-"collector" processing |
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// of java.lang.Reference objects for GC. The interface is useful for supporting |
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// a generational abstraction, in particular when there are multiple |
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// generations that are being independently collected -- possibly |
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// concurrently and/or incrementally. |
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// ReferenceProcessor class abstracts away from a generational setting |
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// by using a closure that determines whether a given reference or referent are |
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// subject to this ReferenceProcessor's discovery, thus allowing its use in a |
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// straightforward manner in a general, non-generational, non-contiguous generation |
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// (or heap) setting. |
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// |
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// forward references |
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class ReferencePolicy; |
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class AbstractRefProcTaskExecutor; |
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// List of discovered references. |
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class DiscoveredList { |
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public: |
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DiscoveredList() : _len(0), _compressed_head(0), _oop_head(NULL) { } |
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inline oop head() const; |
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HeapWord* adr_head() { |
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return UseCompressedOops ? (HeapWord*)&_compressed_head : |
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(HeapWord*)&_oop_head; |
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} |
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inline void set_head(oop o); |
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inline bool is_empty() const; |
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size_t length() { return _len; } |
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void set_length(size_t len) { _len = len; } |
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void inc_length(size_t inc) { _len += inc; assert(_len > 0, "Error"); } |
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void dec_length(size_t dec) { _len -= dec; } |
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private: |
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// Set value depending on UseCompressedOops. This could be a template class |
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// but then we have to fix all the instantiations and declarations that use this class. |
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oop _oop_head; |
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narrowOop _compressed_head; |
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size_t _len; |
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}; |
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// Iterator for the list of discovered references. |
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class DiscoveredListIterator { |
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private: |
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DiscoveredList& _refs_list; |
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HeapWord* _prev_discovered_addr; |
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oop _prev_discovered; |
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oop _current_discovered; |
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HeapWord* _current_discovered_addr; |
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oop _next_discovered; |
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HeapWord* _referent_addr; |
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oop _referent; |
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OopClosure* _keep_alive; |
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BoolObjectClosure* _is_alive; |
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DEBUG_ONLY( |
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oop _first_seen; // cyclic linked list check |
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) |
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NOT_PRODUCT( |
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size_t _processed; |
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size_t _removed; |
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) |
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public: |
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inline DiscoveredListIterator(DiscoveredList& refs_list, |
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OopClosure* keep_alive, |
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BoolObjectClosure* is_alive); |
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// End Of List. |
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inline bool has_next() const { return _current_discovered != NULL; } |
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// Get oop to the Reference object. |
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inline oop obj() const { return _current_discovered; } |
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// Get oop to the referent object. |
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inline oop referent() const { return _referent; } |
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// Returns true if referent is alive. |
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inline bool is_referent_alive() const { |
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return _is_alive->do_object_b(_referent); |
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} |
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// Loads data for the current reference. |
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// The "allow_null_referent" argument tells us to allow for the possibility |
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// of a NULL referent in the discovered Reference object. This typically |
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// happens in the case of concurrent collectors that may have done the |
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// discovery concurrently, or interleaved, with mutator execution. |
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void load_ptrs(DEBUG_ONLY(bool allow_null_referent)); |
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// Move to the next discovered reference. |
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inline void next() { |
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_prev_discovered_addr = _current_discovered_addr; |
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_prev_discovered = _current_discovered; |
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move_to_next(); |
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} |
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// Remove the current reference from the list |
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void remove(); |
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// Make the referent alive. |
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inline void make_referent_alive() { |
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if (UseCompressedOops) { |
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_keep_alive->do_oop((narrowOop*)_referent_addr); |
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} else { |
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_keep_alive->do_oop((oop*)_referent_addr); |
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} |
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} |
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// Do enqueuing work, i.e. notifying the GC about the changed discovered pointers. |
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void enqueue(); |
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// Move enqueued references to the reference pending list. |
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void complete_enqueue(); |
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// NULL out referent pointer. |
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void clear_referent(); |
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// Statistics |
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NOT_PRODUCT( |
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inline size_t processed() const { return _processed; } |
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inline size_t removed() const { return _removed; } |
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) |
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|
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inline void move_to_next() { |
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if (_current_discovered == _next_discovered) { |
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// End of the list. |
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_current_discovered = NULL; |
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} else { |
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_current_discovered = _next_discovered; |
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} |
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assert(_current_discovered != _first_seen, "cyclic ref_list found"); |
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NOT_PRODUCT(_processed++); |
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} |
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}; |
1 | 172 |
|
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class ReferenceProcessor : public ReferenceDiscoverer { |
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size_t total_count(DiscoveredList lists[]) const; |
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// The SoftReference master timestamp clock |
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static jlong _soft_ref_timestamp_clock; |
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BoolObjectClosure* _is_subject_to_discovery; // determines whether a given oop is subject |
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// to this ReferenceProcessor's discovery |
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// (and further processing). |
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|
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bool _discovering_refs; // true when discovery enabled |
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bool _discovery_is_atomic; // if discovery is atomic wrt |
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// other collectors in configuration |
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bool _discovery_is_mt; // true if reference discovery is MT. |
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|
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bool _enqueuing_is_done; // true if all weak references enqueued |
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bool _processing_is_mt; // true during phases when |
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// reference processing is MT. |
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uint _next_id; // round-robin mod _num_queues counter in |
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// support of work distribution |
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|
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// For collectors that do not keep GC liveness information |
1 | 195 |
// in the object header, this field holds a closure that |
196 |
// helps the reference processor determine the reachability |
|
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// of an oop. It is currently initialized to NULL for all |
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// collectors except for CMS and G1. |
1 | 199 |
BoolObjectClosure* _is_alive_non_header; |
200 |
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// Soft ref clearing policies |
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// . the default policy |
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static ReferencePolicy* _default_soft_ref_policy; |
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// . the "clear all" policy |
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static ReferencePolicy* _always_clear_soft_ref_policy; |
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// . the current policy below is either one of the above |
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ReferencePolicy* _current_soft_ref_policy; |
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|
1 | 209 |
// The discovered ref lists themselves |
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|
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// The active MT'ness degree of the queues below |
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uint _num_queues; |
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// The maximum MT'ness degree of the queues below |
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uint _max_num_queues; |
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215 |
|
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// Master array of discovered oops |
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DiscoveredList* _discovered_refs; |
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|
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// Arrays of lists of oops, one per thread (pointers into master array above) |
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DiscoveredList* _discoveredSoftRefs; |
1 | 221 |
DiscoveredList* _discoveredWeakRefs; |
222 |
DiscoveredList* _discoveredFinalRefs; |
|
223 |
DiscoveredList* _discoveredPhantomRefs; |
|
224 |
||
225 |
public: |
|
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static int number_of_subclasses_of_ref() { return (REF_PHANTOM - REF_OTHER); } |
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227 |
|
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uint num_queues() const { return _num_queues; } |
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uint max_num_queues() const { return _max_num_queues; } |
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void set_active_mt_degree(uint v); |
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DiscoveredList* discovered_refs() { return _discovered_refs; } |
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233 |
|
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ReferencePolicy* setup_policy(bool always_clear) { |
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_current_soft_ref_policy = always_clear ? |
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_always_clear_soft_ref_policy : _default_soft_ref_policy; |
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_current_soft_ref_policy->setup(); // snapshot the policy threshold |
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return _current_soft_ref_policy; |
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} |
1 | 240 |
|
241 |
// Process references with a certain reachability level. |
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void process_discovered_reflist(DiscoveredList refs_lists[], |
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ReferencePolicy* policy, |
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bool clear_referent, |
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BoolObjectClosure* is_alive, |
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OopClosure* keep_alive, |
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VoidClosure* complete_gc, |
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AbstractRefProcTaskExecutor* task_executor, |
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ReferenceProcessorPhaseTimes* phase_times); |
1 | 250 |
|
251 |
// Work methods used by the method process_discovered_reflist |
|
252 |
// Phase1: keep alive all those referents that are otherwise |
|
253 |
// dead but which must be kept alive by policy (and their closure). |
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void process_phase1(DiscoveredList& refs_list, |
1 | 255 |
ReferencePolicy* policy, |
256 |
BoolObjectClosure* is_alive, |
|
257 |
OopClosure* keep_alive, |
|
258 |
VoidClosure* complete_gc); |
|
259 |
// Phase2: remove all those references whose referents are |
|
260 |
// reachable. |
|
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void process_phase2(DiscoveredList& refs_list, |
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BoolObjectClosure* is_alive, |
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OopClosure* keep_alive, |
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VoidClosure* complete_gc); |
1 | 265 |
// Work methods in support of process_phase2 |
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void pp2_work(DiscoveredList& refs_list, |
1 | 267 |
BoolObjectClosure* is_alive, |
268 |
OopClosure* keep_alive); |
|
269 |
void pp2_work_concurrent_discovery( |
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DiscoveredList& refs_list, |
1 | 271 |
BoolObjectClosure* is_alive, |
272 |
OopClosure* keep_alive, |
|
273 |
VoidClosure* complete_gc); |
|
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// Phase3: process the referents by either clearing them |
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// or keeping them alive (and their closure), and enqueuing them. |
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void process_phase3(DiscoveredList& refs_list, |
1 | 277 |
bool clear_referent, |
278 |
BoolObjectClosure* is_alive, |
|
279 |
OopClosure* keep_alive, |
|
280 |
VoidClosure* complete_gc); |
|
281 |
||
282 |
// "Preclean" all the discovered reference lists |
|
283 |
// by removing references with strongly reachable referents. |
|
284 |
// The first argument is a predicate on an oop that indicates |
|
285 |
// its (strong) reachability and the second is a closure that |
|
286 |
// may be used to incrementalize or abort the precleaning process. |
|
287 |
// The caller is responsible for taking care of potential |
|
288 |
// interference with concurrent operations on these lists |
|
289 |
// (or predicates involved) by other threads. Currently |
|
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// only used by the CMS collector. |
1 | 291 |
void preclean_discovered_references(BoolObjectClosure* is_alive, |
292 |
OopClosure* keep_alive, |
|
293 |
VoidClosure* complete_gc, |
|
18025 | 294 |
YieldClosure* yield, |
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GCTimer* gc_timer); |
1 | 296 |
|
297 |
// Returns the name of the discovered reference list |
|
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// occupying the i / _num_queues slot. |
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const char* list_name(uint i); |
1 | 300 |
|
301 |
// "Preclean" the given discovered reference list |
|
302 |
// by removing references with strongly reachable referents. |
|
303 |
// Currently used in support of CMS only. |
|
304 |
void preclean_discovered_reflist(DiscoveredList& refs_list, |
|
305 |
BoolObjectClosure* is_alive, |
|
306 |
OopClosure* keep_alive, |
|
307 |
VoidClosure* complete_gc, |
|
308 |
YieldClosure* yield); |
|
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private: |
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// round-robin mod _num_queues (not: _not_ mod _max_num_queues) |
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uint next_id() { |
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uint id = _next_id; |
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assert(!_discovery_is_mt, "Round robin should only be used in serial discovery"); |
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if (++_next_id == _num_queues) { |
1 | 315 |
_next_id = 0; |
316 |
} |
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317 |
assert(_next_id < _num_queues, "_next_id %u _num_queues %u _max_num_queues %u", _next_id, _num_queues, _max_num_queues); |
1 | 318 |
return id; |
319 |
} |
|
320 |
DiscoveredList* get_discovered_list(ReferenceType rt); |
|
321 |
inline void add_to_discovered_list_mt(DiscoveredList& refs_list, oop obj, |
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HeapWord* discovered_addr); |
1 | 323 |
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void clear_discovered_references(DiscoveredList& refs_list); |
1 | 325 |
|
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void log_reflist_counts(DiscoveredList ref_lists[], uint active_length, size_t total_count) PRODUCT_RETURN; |
1 | 327 |
|
328 |
// Balances reference queues. |
|
329 |
void balance_queues(DiscoveredList ref_lists[]); |
|
330 |
||
331 |
// Update (advance) the soft ref master clock field. |
|
332 |
void update_soft_ref_master_clock(); |
|
333 |
||
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bool is_subject_to_discovery(oop const obj) const; |
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335 |
|
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336 |
public: |
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337 |
// Default parameters give you a vanilla reference processor. |
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338 |
ReferenceProcessor(BoolObjectClosure* is_subject_to_discovery, |
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bool mt_processing = false, uint mt_processing_degree = 1, |
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bool mt_discovery = false, uint mt_discovery_degree = 1, |
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341 |
bool atomic_discovery = true, |
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342 |
BoolObjectClosure* is_alive_non_header = NULL); |
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343 |
|
1 | 344 |
// RefDiscoveryPolicy values |
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345 |
enum DiscoveryPolicy { |
1 | 346 |
ReferenceBasedDiscovery = 0, |
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347 |
ReferentBasedDiscovery = 1, |
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DiscoveryPolicyMin = ReferenceBasedDiscovery, |
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349 |
DiscoveryPolicyMax = ReferentBasedDiscovery |
1 | 350 |
}; |
351 |
||
352 |
static void init_statics(); |
|
353 |
||
354 |
public: |
|
355 |
// get and set "is_alive_non_header" field |
|
356 |
BoolObjectClosure* is_alive_non_header() { |
|
357 |
return _is_alive_non_header; |
|
358 |
} |
|
359 |
void set_is_alive_non_header(BoolObjectClosure* is_alive_non_header) { |
|
360 |
_is_alive_non_header = is_alive_non_header; |
|
361 |
} |
|
362 |
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BoolObjectClosure* is_subject_to_discovery_closure() const { return _is_subject_to_discovery; } |
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364 |
void set_is_subject_to_discovery_closure(BoolObjectClosure* cl) { _is_subject_to_discovery = cl; } |
1 | 365 |
|
366 |
// start and stop weak ref discovery |
|
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367 |
void enable_discovery(bool check_no_refs = true); |
1 | 368 |
void disable_discovery() { _discovering_refs = false; } |
369 |
bool discovery_enabled() { return _discovering_refs; } |
|
370 |
||
371 |
// whether discovery is atomic wrt other collectors |
|
372 |
bool discovery_is_atomic() const { return _discovery_is_atomic; } |
|
373 |
void set_atomic_discovery(bool atomic) { _discovery_is_atomic = atomic; } |
|
374 |
||
375 |
// whether discovery is done by multiple threads same-old-timeously |
|
376 |
bool discovery_is_mt() const { return _discovery_is_mt; } |
|
377 |
void set_mt_discovery(bool mt) { _discovery_is_mt = mt; } |
|
378 |
||
379 |
// Whether we are in a phase when _processing_ is MT. |
|
380 |
bool processing_is_mt() const { return _processing_is_mt; } |
|
381 |
void set_mt_processing(bool mt) { _processing_is_mt = mt; } |
|
382 |
||
22551 | 383 |
// whether all enqueueing of weak references is complete |
1 | 384 |
bool enqueuing_is_done() { return _enqueuing_is_done; } |
385 |
void set_enqueuing_is_done(bool v) { _enqueuing_is_done = v; } |
|
386 |
||
387 |
// iterate over oops |
|
388 |
void weak_oops_do(OopClosure* f); // weak roots |
|
389 |
||
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|
390 |
void verify_list(DiscoveredList& ref_list); |
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391 |
|
1 | 392 |
// Discover a Reference object, using appropriate discovery criteria |
49827 | 393 |
virtual bool discover_reference(oop obj, ReferenceType rt); |
1 | 394 |
|
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395 |
// Has discovered references that need handling |
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396 |
bool has_discovered_references(); |
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397 |
|
1 | 398 |
// Process references found during GC (called by the garbage collector) |
18025 | 399 |
ReferenceProcessorStats |
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400 |
process_discovered_references(BoolObjectClosure* is_alive, |
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|
401 |
OopClosure* keep_alive, |
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|
402 |
VoidClosure* complete_gc, |
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|
403 |
AbstractRefProcTaskExecutor* task_executor, |
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|
404 |
ReferenceProcessorPhaseTimes* phase_times); |
1 | 405 |
|
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406 |
// If a discovery is in process that is being superceded, abandon it: all |
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|
407 |
// the discovered lists will be empty, and all the objects on them will |
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|
408 |
// have NULL discovered fields. Must be called only at a safepoint. |
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|
409 |
void abandon_partial_discovery(); |
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|
410 |
|
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|
411 |
size_t total_reference_count(ReferenceType rt) const; |
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|
412 |
|
1 | 413 |
// debugging |
414 |
void verify_no_references_recorded() PRODUCT_RETURN; |
|
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|
415 |
void verify_referent(oop obj) PRODUCT_RETURN; |
1 | 416 |
}; |
417 |
||
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|
418 |
// A subject-to-discovery closure that uses a single memory span to determine the area that |
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|
419 |
// is subject to discovery. Useful for collectors which have contiguous generations. |
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|
420 |
class SpanSubjectToDiscoveryClosure : public BoolObjectClosure { |
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|
421 |
MemRegion _span; |
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|
422 |
|
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|
423 |
public: |
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|
424 |
SpanSubjectToDiscoveryClosure() : BoolObjectClosure(), _span() { } |
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|
425 |
SpanSubjectToDiscoveryClosure(MemRegion span) : BoolObjectClosure(), _span(span) { } |
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|
426 |
|
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|
427 |
MemRegion span() const { return _span; } |
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|
428 |
|
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|
429 |
void set_span(MemRegion mr) { |
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|
430 |
_span = mr; |
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|
431 |
} |
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|
432 |
|
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|
433 |
virtual bool do_object_b(oop obj) { |
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|
434 |
return _span.contains(obj); |
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|
435 |
} |
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|
436 |
}; |
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|
437 |
|
1 | 438 |
// A utility class to disable reference discovery in |
439 |
// the scope which contains it, for given ReferenceProcessor. |
|
440 |
class NoRefDiscovery: StackObj { |
|
441 |
private: |
|
442 |
ReferenceProcessor* _rp; |
|
443 |
bool _was_discovering_refs; |
|
444 |
public: |
|
445 |
NoRefDiscovery(ReferenceProcessor* rp) : _rp(rp) { |
|
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|
446 |
_was_discovering_refs = _rp->discovery_enabled(); |
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|
447 |
if (_was_discovering_refs) { |
1 | 448 |
_rp->disable_discovery(); |
449 |
} |
|
450 |
} |
|
451 |
||
452 |
~NoRefDiscovery() { |
|
453 |
if (_was_discovering_refs) { |
|
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|
454 |
_rp->enable_discovery(false /*check_no_refs*/); |
1 | 455 |
} |
456 |
} |
|
457 |
}; |
|
458 |
||
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|
459 |
// A utility class to temporarily mutate the subject discovery closure of the |
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|
460 |
// given ReferenceProcessor in the scope that contains it. |
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|
461 |
class ReferenceProcessorSubjectToDiscoveryMutator : StackObj { |
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|
462 |
ReferenceProcessor* _rp; |
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|
463 |
BoolObjectClosure* _saved_cl; |
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|
464 |
|
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|
465 |
public: |
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|
466 |
ReferenceProcessorSubjectToDiscoveryMutator(ReferenceProcessor* rp, BoolObjectClosure* cl): |
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|
467 |
_rp(rp) { |
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|
468 |
_saved_cl = _rp->is_subject_to_discovery_closure(); |
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|
469 |
_rp->set_is_subject_to_discovery_closure(cl); |
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|
470 |
} |
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|
471 |
|
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|
472 |
~ReferenceProcessorSubjectToDiscoveryMutator() { |
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|
473 |
_rp->set_is_subject_to_discovery_closure(_saved_cl); |
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|
474 |
} |
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|
475 |
}; |
1 | 476 |
|
477 |
// A utility class to temporarily mutate the span of the |
|
478 |
// given ReferenceProcessor in the scope that contains it. |
|
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|
479 |
class ReferenceProcessorSpanMutator : StackObj { |
1 | 480 |
ReferenceProcessor* _rp; |
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|
481 |
SpanSubjectToDiscoveryClosure _discoverer; |
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|
482 |
BoolObjectClosure* _old_discoverer; |
1 | 483 |
|
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|
484 |
public: |
1 | 485 |
ReferenceProcessorSpanMutator(ReferenceProcessor* rp, |
486 |
MemRegion span): |
|
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|
487 |
_rp(rp), |
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|
488 |
_discoverer(span), |
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|
489 |
_old_discoverer(rp->is_subject_to_discovery_closure()) { |
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|
490 |
|
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|
491 |
rp->set_is_subject_to_discovery_closure(&_discoverer); |
1 | 492 |
} |
493 |
||
494 |
~ReferenceProcessorSpanMutator() { |
|
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|
495 |
_rp->set_is_subject_to_discovery_closure(_old_discoverer); |
1 | 496 |
} |
497 |
}; |
|
498 |
||
499 |
// A utility class to temporarily change the MT'ness of |
|
500 |
// reference discovery for the given ReferenceProcessor |
|
501 |
// in the scope that contains it. |
|
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|
502 |
class ReferenceProcessorMTDiscoveryMutator: StackObj { |
1 | 503 |
private: |
504 |
ReferenceProcessor* _rp; |
|
505 |
bool _saved_mt; |
|
506 |
||
507 |
public: |
|
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|
508 |
ReferenceProcessorMTDiscoveryMutator(ReferenceProcessor* rp, |
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|
509 |
bool mt): |
1 | 510 |
_rp(rp) { |
511 |
_saved_mt = _rp->discovery_is_mt(); |
|
512 |
_rp->set_mt_discovery(mt); |
|
513 |
} |
|
514 |
||
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|
515 |
~ReferenceProcessorMTDiscoveryMutator() { |
1 | 516 |
_rp->set_mt_discovery(_saved_mt); |
517 |
} |
|
518 |
}; |
|
519 |
||
520 |
// A utility class to temporarily change the disposition |
|
521 |
// of the "is_alive_non_header" closure field of the |
|
522 |
// given ReferenceProcessor in the scope that contains it. |
|
523 |
class ReferenceProcessorIsAliveMutator: StackObj { |
|
524 |
private: |
|
525 |
ReferenceProcessor* _rp; |
|
526 |
BoolObjectClosure* _saved_cl; |
|
527 |
||
528 |
public: |
|
529 |
ReferenceProcessorIsAliveMutator(ReferenceProcessor* rp, |
|
530 |
BoolObjectClosure* cl): |
|
531 |
_rp(rp) { |
|
532 |
_saved_cl = _rp->is_alive_non_header(); |
|
533 |
_rp->set_is_alive_non_header(cl); |
|
534 |
} |
|
535 |
||
536 |
~ReferenceProcessorIsAliveMutator() { |
|
537 |
_rp->set_is_alive_non_header(_saved_cl); |
|
538 |
} |
|
539 |
}; |
|
540 |
||
541 |
// A utility class to temporarily change the disposition |
|
542 |
// of the "discovery_is_atomic" field of the |
|
543 |
// given ReferenceProcessor in the scope that contains it. |
|
544 |
class ReferenceProcessorAtomicMutator: StackObj { |
|
545 |
private: |
|
546 |
ReferenceProcessor* _rp; |
|
547 |
bool _saved_atomic_discovery; |
|
548 |
||
549 |
public: |
|
550 |
ReferenceProcessorAtomicMutator(ReferenceProcessor* rp, |
|
551 |
bool atomic): |
|
552 |
_rp(rp) { |
|
553 |
_saved_atomic_discovery = _rp->discovery_is_atomic(); |
|
554 |
_rp->set_atomic_discovery(atomic); |
|
555 |
} |
|
556 |
||
557 |
~ReferenceProcessorAtomicMutator() { |
|
558 |
_rp->set_atomic_discovery(_saved_atomic_discovery); |
|
559 |
} |
|
560 |
}; |
|
561 |
||
562 |
||
563 |
// A utility class to temporarily change the MT processing |
|
564 |
// disposition of the given ReferenceProcessor instance |
|
565 |
// in the scope that contains it. |
|
566 |
class ReferenceProcessorMTProcMutator: StackObj { |
|
567 |
private: |
|
568 |
ReferenceProcessor* _rp; |
|
569 |
bool _saved_mt; |
|
570 |
||
571 |
public: |
|
572 |
ReferenceProcessorMTProcMutator(ReferenceProcessor* rp, |
|
573 |
bool mt): |
|
574 |
_rp(rp) { |
|
575 |
_saved_mt = _rp->processing_is_mt(); |
|
576 |
_rp->set_mt_processing(mt); |
|
577 |
} |
|
578 |
||
579 |
~ReferenceProcessorMTProcMutator() { |
|
580 |
_rp->set_mt_processing(_saved_mt); |
|
581 |
} |
|
582 |
}; |
|
583 |
||
584 |
||
585 |
// This class is an interface used to implement task execution for the |
|
586 |
// reference processing. |
|
587 |
class AbstractRefProcTaskExecutor { |
|
588 |
public: |
|
589 |
||
590 |
// Abstract tasks to execute. |
|
591 |
class ProcessTask; |
|
592 |
class EnqueueTask; |
|
593 |
||
594 |
// Executes a task using worker threads. |
|
595 |
virtual void execute(ProcessTask& task) = 0; |
|
596 |
virtual void execute(EnqueueTask& task) = 0; |
|
597 |
||
598 |
// Switch to single threaded mode. |
|
599 |
virtual void set_single_threaded_mode() { }; |
|
600 |
}; |
|
601 |
||
602 |
// Abstract reference processing task to execute. |
|
603 |
class AbstractRefProcTaskExecutor::ProcessTask { |
|
604 |
protected: |
|
46795
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|
605 |
ProcessTask(ReferenceProcessor& ref_processor, |
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|
606 |
DiscoveredList refs_lists[], |
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|
607 |
bool marks_oops_alive, |
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parents:
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|
608 |
ReferenceProcessorPhaseTimes* phase_times) |
1 | 609 |
: _ref_processor(ref_processor), |
610 |
_refs_lists(refs_lists), |
|
46795
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parents:
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diff
changeset
|
611 |
_phase_times(phase_times), |
1 | 612 |
_marks_oops_alive(marks_oops_alive) |
613 |
{ } |
|
614 |
||
615 |
public: |
|
616 |
virtual void work(unsigned int work_id, BoolObjectClosure& is_alive, |
|
617 |
OopClosure& keep_alive, |
|
618 |
VoidClosure& complete_gc) = 0; |
|
619 |
||
620 |
// Returns true if a task marks some oops as alive. |
|
621 |
bool marks_oops_alive() const |
|
622 |
{ return _marks_oops_alive; } |
|
623 |
||
624 |
protected: |
|
46795
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|
625 |
ReferenceProcessor& _ref_processor; |
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diff
changeset
|
626 |
DiscoveredList* _refs_lists; |
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parents:
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diff
changeset
|
627 |
ReferenceProcessorPhaseTimes* _phase_times; |
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parents:
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diff
changeset
|
628 |
const bool _marks_oops_alive; |
1 | 629 |
}; |
630 |
||
631 |
// Abstract reference processing task to execute. |
|
632 |
class AbstractRefProcTaskExecutor::EnqueueTask { |
|
633 |
protected: |
|
46795
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parents:
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diff
changeset
|
634 |
EnqueueTask(ReferenceProcessor& ref_processor, |
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changeset
|
635 |
DiscoveredList refs_lists[], |
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diff
changeset
|
636 |
int n_queues, |
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parents:
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diff
changeset
|
637 |
ReferenceProcessorPhaseTimes* phase_times) |
1 | 638 |
: _ref_processor(ref_processor), |
639 |
_refs_lists(refs_lists), |
|
46795
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parents:
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diff
changeset
|
640 |
_n_queues(n_queues), |
623a5e42deb6
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parents:
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diff
changeset
|
641 |
_phase_times(phase_times) |
1 | 642 |
{ } |
643 |
||
644 |
public: |
|
645 |
virtual void work(unsigned int work_id) = 0; |
|
646 |
||
647 |
protected: |
|
46795
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parents:
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diff
changeset
|
648 |
ReferenceProcessor& _ref_processor; |
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diff
changeset
|
649 |
DiscoveredList* _refs_lists; |
623a5e42deb6
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diff
changeset
|
650 |
ReferenceProcessorPhaseTimes* _phase_times; |
623a5e42deb6
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parents:
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diff
changeset
|
651 |
int _n_queues; |
1 | 652 |
}; |
7397 | 653 |
|
30764 | 654 |
#endif // SHARE_VM_GC_SHARED_REFERENCEPROCESSOR_HPP |