1 /*

     2  * Copyright (c) 2015, 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 #ifndef SHARE_GC_Z_ZFORWARDING_HPP

    25 #define SHARE_GC_Z_ZFORWARDING_HPP

    26 

    27 #include "gc/z/zForwardingTableEntry.hpp"

    28 #include "memory/allocation.hpp"

    29 

    30 typedef size_t ZForwardingTableCursor;

    31 

    32 class ZForwardingTable {

    33   friend class VMStructs;

    34   friend class ZForwardingTableTest;

    35 

    36 private:

    37   ZForwardingTableEntry* _table;

    38   size_t                 _size;

    39 

    40   ZForwardingTableEntry at(ZForwardingTableCursor* cursor) const;

    41   ZForwardingTableEntry first(uintptr_t from_index, ZForwardingTableCursor* cursor) const;

    42   ZForwardingTableEntry next(ZForwardingTableCursor* cursor) const;

    43 

    44 public:

    45   ZForwardingTable();

    46   ~ZForwardingTable();

    47 

    48   bool is_null() const;

    49   void setup(size_t live_objects);

    50   void reset();

    51 

    52   ZForwardingTableEntry find(uintptr_t from_index) const;

    53   ZForwardingTableEntry find(uintptr_t from_index, ZForwardingTableCursor* cursor) const;

    54   uintptr_t insert(uintptr_t from_index, uintptr_t to_offset, ZForwardingTableCursor* cursor);

    55 

    56   void verify(size_t object_max_count, size_t live_objects) const;

    57 };

    58 

    59 #endif // SHARE_GC_Z_ZFORWARDING_HPP