src/hotspot/share/gc/z/zHeapIterator.hpp
author stefank
Mon, 10 Jun 2019 13:04:12 +0200
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8227175: ZGC: ZHeapIterator visits potentially dead objects Reviewed-by: zgu, eosterlund
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/*
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 * Copyright (c) 2017, 2019, 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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#ifndef SHARE_GC_Z_ZHEAPITERATOR_HPP
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#define SHARE_GC_Z_ZHEAPITERATOR_HPP
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#include "gc/z/zGranuleMap.hpp"
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#include "memory/allocation.hpp"
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#include "utilities/stack.hpp"
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class ObjectClosure;
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class ZHeapIteratorBitMap;
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class ZHeapIterator : public StackObj {
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  template<bool Concurrent, bool Weak> friend class ZHeapIteratorRootOopClosure;
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  template<bool VisitReferents> friend class ZHeapIteratorOopClosure;
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private:
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  typedef ZGranuleMap<ZHeapIteratorBitMap*>         ZVisitMap;
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  typedef ZGranuleMapIterator<ZHeapIteratorBitMap*> ZVisitMapIterator;
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  typedef Stack<oop, mtGC>                          ZVisitStack;
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  ZVisitStack _visit_stack;
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  ZVisitMap   _visit_map;
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  ZHeapIteratorBitMap* object_map(oop obj);
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  void push(oop obj);
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  template <typename RootsIterator, bool Concurrent, bool Weak> void push_roots();
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  template <bool VisitReferents> void push_fields(oop obj);
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  template <bool VisitReferents> void objects_do(ObjectClosure* cl);
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public:
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  ZHeapIterator();
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  ~ZHeapIterator();
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  void objects_do(ObjectClosure* cl, bool visit_weaks);
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};
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#endif // SHARE_GC_Z_ZHEAPITERATOR_HPP