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 #include "precompiled.hpp"
  26 #include "classfile/javaClasses.inline.hpp"
  27 #include "gc/shared/accessBarrierSupport.inline.hpp"
  28 #include "oops/access.hpp"
  29 
  30 DecoratorSet AccessBarrierSupport::resolve_unknown_oop_ref_strength(DecoratorSet decorators, oop base, ptrdiff_t offset) {
  31   DecoratorSet ds = decorators & ~ON_UNKNOWN_OOP_REF;
  32   if (!java_lang_ref_Reference::is_referent_field(base, offset) ||
  33       java_lang_ref_Reference::is_final(base)) {
  34     ds |= ON_STRONG_OOP_REF;
  35   } else if (java_lang_ref_Reference::is_phantom(base)) {
  36     ds |= ON_PHANTOM_OOP_REF;
  37   } else {
  38     ds |= ON_WEAK_OOP_REF;
  39   }
  40   return ds;
  41 }
--- EOF ---