1 /*
   2  * Copyright (c) 2018, 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
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  22  *
  23  */
  24 
  25 #ifndef SHARE_GC_SHARED_BARRIERSETNMETHOD_HPP
  26 #define SHARE_GC_SHARED_BARRIERSETNMETHOD_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 #include "utilities/sizes.hpp"
  31 
  32 class nmethod;
  33 
  34 class BarrierSetNMethod: public CHeapObj<mtGC> {
  35   bool supports_entry_barrier(nmethod* nm);
  36   void deoptimize(nmethod* nm, address* return_addr_ptr);
  37 
  38 protected:
  39   virtual int disarmed_value() const;
  40   virtual bool nmethod_entry_barrier(nmethod* nm) = 0;
  41 
  42 public:
  43   virtual ByteSize thread_disarmed_offset() const = 0;
  44   virtual intptr_t disarmed_address() const = 0;
  45 
  46   static int nmethod_stub_entry_barrier(address* return_address_ptr);
  47   bool nmethod_osr_entry_barrier(nmethod* nm);
  48   bool is_armed(nmethod* nm);
  49   void disarm(nmethod* nm);
  50 };
  51 
  52 
  53 #endif // SHARE_GC_SHARED_BARRIERSETNMETHOD_HPP