1 /*

     2  * Copyright (c) 2017, 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_ZNMETHODTABLE_HPP

    25 #define SHARE_GC_Z_ZNMETHODTABLE_HPP

    26 

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

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

    29 #include "memory/allocation.hpp"

    30 

    31 class ZNMethodTable : public AllStatic {

    32 private:

    33   static ZNMethodTableEntry* _table;

    34   static size_t              _size;

    35   static size_t              _nregistered;

    36   static size_t              _nunregistered;

    37   static volatile size_t     _claimed ATTRIBUTE_ALIGNED(ZCacheLineSize);

    38 

    39   static ZNMethodTableEntry create_entry(nmethod* nm);

    40   static void destroy_entry(ZNMethodTableEntry entry);

    41 

    42   static nmethod* method(ZNMethodTableEntry entry);

    43 

    44   static size_t first_index(const nmethod* nm, size_t size);

    45   static size_t next_index(size_t prev_index, size_t size);

    46 

    47   static bool register_entry(ZNMethodTableEntry* table, size_t size, ZNMethodTableEntry entry);

    48   static bool unregister_entry(ZNMethodTableEntry* table, size_t size, const nmethod* nm);

    49 

    50   static void rebuild(size_t new_size);

    51   static void rebuild_if_needed();

    52 

    53   static void log_register(const nmethod* nm, ZNMethodTableEntry entry);

    54   static void log_unregister(const nmethod* nm);

    55 

    56   static void entry_oops_do(ZNMethodTableEntry entry, OopClosure* cl);

    57 

    58 public:

    59   static size_t registered_nmethods();

    60   static size_t unregistered_nmethods();

    61 

    62   static void register_nmethod(nmethod* nm);

    63   static void unregister_nmethod(nmethod* nm);

    64 

    65   static void gc_prologue();

    66   static void gc_epilogue();

    67 

    68   static void oops_do(OopClosure* cl);

    69 };

    70 

    71 #endif // SHARE_GC_Z_ZNMETHODTABLE_HPP