159 lines
6.3 KiB
C++
159 lines
6.3 KiB
C++
/*
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* Copyright (c) 1997, 2017, 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 "gc/shared/specialized_oop_closures.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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private:
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InstanceRefKlass(const ClassFileParser& parser) : InstanceKlass(parser, InstanceKlass::_misc_kind_reference) {}
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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 Scavenge
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void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
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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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// [nv = true] Use non-virtual calls to do_oop_nv.
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// [nv = false] Use virtual calls to do_oop.
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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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private:
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// Iterate over all oop fields and metadata.
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template <bool nv, 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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#if INCLUDE_OOP_OOP_ITERATE_BACKWARDS
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// Iterate over all oop fields and metadata.
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template <bool nv, class OopClosureType>
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inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
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#endif
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// Bounded range iteration
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// Iterate over all oop fields and metadata.
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template <bool nv, class OopClosureType>
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inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
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// Reference processing part of the iterators.
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// Specialized for [T = oop] or [T = narrowOop].
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template <bool nv, typename T, class OopClosureType, class Contains>
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inline void oop_oop_iterate_ref_processing_specialized(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 <bool nv, 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 <bool nv, 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 <bool nv, 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 <bool nv, 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 <bool nv, 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 <bool nv, 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 <bool nv, 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 <bool nv, 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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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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ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
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#if INCLUDE_OOP_OOP_ITERATE_BACKWARDS
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ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
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#endif
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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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public:
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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
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