1 /*

     2  * Copyright (c) 2014, 2018, 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 

    25 #ifndef SHARE_VM_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP

    26 #define SHARE_VM_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP

    27 

    28 #include "memory/iterator.hpp"

    29 #include "oops/oop.hpp"

    30 

    31 class BitSet;

    32 class Edge;

    33 class EdgeStore;

    34 class EdgeQueue;

    35 

    36 // Class responsible for iterating the heap depth-first

    37 class DFSClosure: public ExtendedOopClosure {

    38  private:

    39   static EdgeStore* _edge_store;

    40   static BitSet*    _mark_bits;

    41   static const Edge*_start_edge;

    42   static size_t _max_depth;

    43   static bool _ignore_root_set;

    44   DFSClosure* _parent;

    45   const oop* _reference;

    46   size_t _depth;

    47 

    48   void add_chain();

    49   void closure_impl(const oop* reference, const oop pointee);

    50 

    51   DFSClosure* parent() const { return _parent; }

    52   const oop* reference() const { return _reference; }

    53 

    54   DFSClosure(DFSClosure* parent, size_t depth);

    55   DFSClosure();

    56 

    57  public:

    58   static void find_leaks_from_edge(EdgeStore* edge_store, BitSet* mark_bits, const Edge* start_edge);

    59   static void find_leaks_from_root_set(EdgeStore* edge_store, BitSet* mark_bits);

    60 

    61   virtual void do_oop(oop* ref);

    62   virtual void do_oop(narrowOop* ref);

    63 };

    64 

    65 #endif // SHARE_VM_JFR_LEAKPROFILER_CHAINS_DFSCLOSURE_HPP