1 /*

     2  * Copyright (c) 2017, 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/zAddressRangeMap.hpp"

    28 #include "gc/z/zGlobals.hpp"

    29 #include "memory/allocation.hpp"

    30 #include "utilities/stack.hpp"

    31 

    32 class ZHeapIteratorBitMap;

    33 

    34 class ZHeapIterator : public StackObj {

    35   friend class ZHeapIteratorRootOopClosure;

    36   friend class ZHeapIteratorPushOopClosure;

    37 

    38 private:

    39   typedef ZAddressRangeMap<ZHeapIteratorBitMap*, ZPageSizeMinShift>         ZVisitMap;

    40   typedef ZAddressRangeMapIterator<ZHeapIteratorBitMap*, ZPageSizeMinShift> ZVisitMapIterator;

    41   typedef Stack<oop, mtGC>                                                  ZVisitStack;

    42 

    43   ZVisitStack _visit_stack;

    44   ZVisitMap   _visit_map;

    45 

    46   size_t object_index_max() const;

    47   size_t object_index(oop obj) const;

    48   ZHeapIteratorBitMap* object_map(oop obj);

    49 

    50   void push(oop obj);

    51   void drain(ObjectClosure* cl);

    52 

    53 public:

    54   ZHeapIterator();

    55   ~ZHeapIterator();

    56 

    57   void objects_do(ObjectClosure* cl);

    58 };

    59 

    60 #endif // SHARE_GC_Z_ZHEAPITERATOR_HPP