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