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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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 private:
36   int _current_phase;
37   void deoptimize(nmethod* nm, address* return_addr_ptr);
38 
39 public:
40   BarrierSetNMethod() : _current_phase(1) { }
41   bool supports_entry_barrier(nmethod* nm);
42 
43   virtual bool nmethod_entry_barrier(nmethod* nm);
44   virtual ByteSize thread_disarmed_offset() const;
45   virtual int* disarmed_value_address() const;
46 
47   int disarmed_value() const;
48 
49   static int nmethod_stub_entry_barrier(address* return_address_ptr);
50   bool nmethod_osr_entry_barrier(nmethod* nm);
51   bool is_armed(nmethod* nm);
52   void disarm(nmethod* nm);
53   void arm(nmethod* nm, int arm_value);
54 
55   void arm_all_nmethods();
56 };
57 
58 
59 #endif // SHARE_GC_SHARED_BARRIERSETNMETHOD_HPP