src/hotspot/share/gc/shared/accessBarrierSupport.hpp
changeset 47998 fb0275c320a0
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47997:55c43e677ded 47998:fb0275c320a0
       
     1 /*
       
     2  * Copyright (c) 2017, 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 
       
    25 #ifndef SHARE_VM_GC_SHARED_ACCESSBARRIERSUPPORT_HPP
       
    26 #define SHARE_VM_GC_SHARED_ACCESSBARRIERSUPPORT_HPP
       
    27 
       
    28 #include "memory/allocation.hpp"
       
    29 #include "oops/access.hpp"
       
    30 
       
    31 class AccessBarrierSupport: AllStatic {
       
    32 private:
       
    33   static DecoratorSet resolve_unknown_oop_ref_strength(DecoratorSet decorators, oop base, ptrdiff_t offset);
       
    34 
       
    35 public:
       
    36   // Some collectors, like G1, needs to keep referents alive when loading them.
       
    37   // Therefore, for APIs that accept unknown oop ref strength (e.g. unsafe),
       
    38   // we need to dynamically find out if a given field is on a java.lang.ref.Reference object.
       
    39   // and in that case what strength it has.
       
    40   template<DecoratorSet decorators>
       
    41   static DecoratorSet resolve_possibly_unknown_oop_ref_strength(oop base, ptrdiff_t offset);
       
    42 };
       
    43 
       
    44 #endif // SHARE_VM_GC_SHARED_ACCESSBARRIERSUPPORT_HPP