1 /*
   2  * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #ifndef SHARE_GC_Z_ZHEAPITERATOR_HPP
  25 #define SHARE_GC_Z_ZHEAPITERATOR_HPP
  26 
  27 #include "gc/z/zGranuleMap.hpp"
  28 #include "memory/allocation.hpp"
  29 #include "utilities/stack.hpp"
  30 
  31 class ObjectClosure;
  32 class ZHeapIteratorBitMap;
  33 
  34 class ZHeapIterator : public StackObj {
  35   friend class ZHeapIteratorRootOopClosure;
  36   friend class ZHeapIteratorOopClosure;
  37 
  38 private:
  39   typedef ZGranuleMap<ZHeapIteratorBitMap*>         ZVisitMap;
  40   typedef ZGranuleMapIterator<ZHeapIteratorBitMap*> ZVisitMapIterator;
  41   typedef Stack<oop, mtGC>                          ZVisitStack;
  42 
  43   ZVisitStack _visit_stack;
  44   ZVisitMap   _visit_map;
  45   const bool  _visit_referents;
  46 
  47   ZHeapIteratorBitMap* object_map(oop obj);
  48   void push(oop obj);
  49 
  50 public:
  51   ZHeapIterator(bool visit_referents);
  52   ~ZHeapIterator();
  53 
  54   void objects_do(ObjectClosure* cl);
  55 };
  56 
  57 #endif // SHARE_GC_Z_ZHEAPITERATOR_HPP