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, true /* allow_dead */); 68 return cl.is_unloading(); 69 } else { 70 return false; 71 } 72 }