1 /*
   2  * Copyright (c) 2017, 2019, 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 #include "gc/z/zLock.hpp"
  25 #include "oops/oopsHierarchy.hpp"
  26 #include "utilities/globalDefinitions.hpp"
  27 
  28 class nmethod;
  29 template <typename T> class GrowableArray;
  30 
  31 class ZNMethodDataOops {
  32 private:
  33   const size_t _nimmediates;
  34   bool         _has_non_immediates;
  35 
  36   static size_t header_size();
  37 
  38   ZNMethodDataOops(const GrowableArray<oop*>& immediates, bool has_non_immediates);
  39 
  40 public:
  41   static ZNMethodDataOops* create(const GrowableArray<oop*>& immediates, bool has_non_immediates);
  42   static void destroy(ZNMethodDataOops* oops);
  43 
  44   size_t immediates_count() const;
  45   oop**  immediates_begin() const;
  46   oop**  immediates_end()   const;
  47 
  48   bool   has_non_immediates() const;
  49 };
  50 
  51 class ZNMethodData {
  52 private:
  53   ZReentrantLock             _lock;
  54   ZNMethodDataOops* volatile _oops;
  55 
  56   ZNMethodData(nmethod* nm);
  57 
  58 public:
  59   static ZNMethodData* create(nmethod* nm);
  60   static void destroy(ZNMethodData* data);
  61 
  62   ZReentrantLock* lock();
  63 
  64   ZNMethodDataOops* oops() const;
  65   ZNMethodDataOops* swap_oops(ZNMethodDataOops* oops);
  66 };