src/hotspot/share/gc/shared/gcBehaviours.cpp
changeset 52385 5c679ec60888
child 55562 2f464d628942
equal deleted inserted replaced
52384:d6dc479bcdd3 52385:5c679ec60888
       
     1 /*
       
     2  * Copyright (c) 2018, 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 "code/compiledMethod.hpp"
       
    27 #include "code/nmethod.hpp"
       
    28 #include "gc/shared/gcBehaviours.hpp"
       
    29 
       
    30 IsUnloadingBehaviour* IsUnloadingBehaviour::_current = NULL;
       
    31 
       
    32 class IsCompiledMethodUnloadingOopClosure: public OopClosure {
       
    33   BoolObjectClosure *_cl;
       
    34   bool _is_unloading;
       
    35 
       
    36 public:
       
    37   IsCompiledMethodUnloadingOopClosure(BoolObjectClosure* cl)
       
    38     : _cl(cl),
       
    39       _is_unloading(false)
       
    40   { }
       
    41 
       
    42   virtual void do_oop(oop* p) {
       
    43     if (_is_unloading) {
       
    44       return;
       
    45     }
       
    46     oop obj = *p;
       
    47     if (obj == NULL) {
       
    48       return;
       
    49     }
       
    50     if (!_cl->do_object_b(obj)) {
       
    51       _is_unloading = true;
       
    52     }
       
    53   }
       
    54 
       
    55   virtual void do_oop(narrowOop* p) {
       
    56     ShouldNotReachHere();
       
    57   }
       
    58 
       
    59   bool is_unloading() const {
       
    60     return _is_unloading;
       
    61   }
       
    62 };
       
    63 
       
    64 bool ClosureIsUnloadingBehaviour::is_unloading(CompiledMethod* cm) const {
       
    65   if (cm->is_nmethod()) {
       
    66     IsCompiledMethodUnloadingOopClosure cl(_cl);
       
    67     static_cast<nmethod*>(cm)->oops_do(&cl);
       
    68     return cl.is_unloading();
       
    69   } else {
       
    70     return false;
       
    71   }
       
    72 }