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/* |
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* Copyright (c) 1997, 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_OOPS_INSTANCEREFKLASS_HPP |
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#define SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |
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#include "oops/instanceKlass.hpp" |
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#include "utilities/macros.hpp" |
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class ClassFileParser; |
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// An InstanceRefKlass is a specialized InstanceKlass for Java |
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// classes that are subclasses of java/lang/ref/Reference. |
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// |
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// These classes are used to implement soft/weak/final/phantom |
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// references and finalization, and need special treatment by the |
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// garbage collector. |
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// |
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// During GC discovered reference objects are added (chained) to one |
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// of the four lists below, depending on the type of reference. |
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// The linked occurs through the next field in class java/lang/ref/Reference. |
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// |
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// Afterwards, the discovered references are processed in decreasing |
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// order of reachability. Reference objects eligible for notification |
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// are linked to the static pending_list in class java/lang/ref/Reference, |
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// and the pending list lock object in the same class is notified. |
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class InstanceRefKlass: public InstanceKlass { |
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friend class InstanceKlass; |
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static const KlassID ID = InstanceRefKlassID; |
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InstanceRefKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_reference, ID) {} |
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public: |
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InstanceRefKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); } |
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// GC specific object visitors |
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// |
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#if INCLUDE_PARALLELGC |
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// Parallel Compact |
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void oop_pc_follow_contents(oop obj, ParCompactionManager* cm); |
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void oop_pc_update_pointers(oop obj, ParCompactionManager* cm); |
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#endif |
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// Oop fields (and metadata) iterators |
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// |
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// The InstanceRefKlass iterators also support reference processing. |
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// Forward iteration |
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// Iterate over all oop fields and metadata. |
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template <typename T, class OopClosureType> |
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inline void oop_oop_iterate(oop obj, OopClosureType* closure); |
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// Reverse iteration |
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// Iterate over all oop fields and metadata. |
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template <typename T, class OopClosureType> |
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inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure); |
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// Bounded range iteration |
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// Iterate over all oop fields and metadata. |
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template <typename T, class OopClosureType> |
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inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr); |
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private: |
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// Reference processing part of the iterators. |
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template <typename T, class OopClosureType, class Contains> |
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inline void oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure, Contains& contains); |
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// Only perform reference processing if the referent object is within mr. |
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template <typename T, class OopClosureType> |
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inline void oop_oop_iterate_ref_processing_bounded(oop obj, OopClosureType* closure, MemRegion mr); |
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// Reference processing |
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template <typename T, class OopClosureType> |
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inline void oop_oop_iterate_ref_processing(oop obj, OopClosureType* closure); |
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// Building blocks for specialized handling. |
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template <typename T, class OopClosureType, class Contains> |
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static void do_referent(oop obj, OopClosureType* closure, Contains& contains); |
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template <typename T, class OopClosureType, class Contains> |
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static void do_next(oop obj, OopClosureType* closure, Contains& contains); |
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template <typename T, class OopClosureType, class Contains> |
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static void do_discovered(oop obj, OopClosureType* closure, Contains& contains); |
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template <typename T, class OopClosureType> |
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static bool try_discover(oop obj, ReferenceType type, OopClosureType* closure); |
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// Do discovery while handling InstanceRefKlasses. Reference discovery |
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// is only done if the closure provides a ReferenceProcessor. |
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template <typename T, class OopClosureType, class Contains> |
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static void oop_oop_iterate_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains); |
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// Used for a special case in G1 where the closure needs to be applied |
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// to the discovered field. Reference discovery is also done if the |
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// closure provides a ReferenceProcessor. |
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template <typename T, class OopClosureType, class Contains> |
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static void oop_oop_iterate_discovered_and_discovery(oop obj, ReferenceType type, OopClosureType* closure, Contains& contains); |
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// Apply the closure to all fields. No reference discovery is done. |
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template <typename T, class OopClosureType, class Contains> |
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static void oop_oop_iterate_fields(oop obj, OopClosureType* closure, Contains& contains); |
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// Apply the closure to all fields, except the referent field. No reference discovery is done. |
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template <typename T, class OopClosureType, class Contains> |
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static void oop_oop_iterate_fields_except_referent(oop obj, OopClosureType* closure, Contains& contains); |
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template <typename T> |
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static void trace_reference_gc(const char *s, oop obj) NOT_DEBUG_RETURN; |
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public: |
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// Update non-static oop maps so 'referent', 'nextPending' and |
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// 'discovered' will look like non-oops |
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static void update_nonstatic_oop_maps(Klass* k); |
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// Verification |
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void oop_verify_on(oop obj, outputStream* st); |
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}; |
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#endif // SHARE_VM_OOPS_INSTANCEREFKLASS_HPP |