1 /* 2 * Copyright (c) 2017, 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 #ifndef SHARE_VM_OOPS_OOPHANDLE_HPP 26 #define SHARE_VM_OOPS_OOPHANDLE_HPP 27 28 #include "oops/oop.hpp" 29 30 // Simple class for encapsulating oop pointers stored in metadata. 31 // These are different from Handle. The Handle class stores pointers 32 // to oops on the stack, and manages the allocation from a thread local 33 // area in the constructor. 34 // This assumes that the caller will allocate the handle in the appropriate 35 // area. The reason for the encapsulation is to help with naming and to allow 36 // future uses for read barriers. 37 38 class OopHandle { 39 private: 40 oop* _obj; 41 42 public: 43 OopHandle() : _obj(NULL) {} 44 OopHandle(oop* w) : _obj(w) {} 45 46 inline oop resolve() const; 47 inline oop peek() const; 48 49 // Used only for removing handle. 50 oop* ptr_raw() const { return _obj; } 51 }; 52 53 #endif // SHARE_VM_OOPS_OOPHANDLE_HPP