| /* |
| * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_OOPS_OOPHANDLE_HPP |
| #define SHARE_VM_OOPS_OOPHANDLE_HPP |
| |
| #include "oops/oop.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/orderAccess.hpp" |
| |
| // Simple class for encapsulating oop pointers stored in metadata. |
| // These are different from Handle. The Handle class stores pointers |
| // to oops on the stack, and manages the allocation from a thread local |
| // area in the constructor. |
| // This assumes that the caller will allocate the handle in the appropriate |
| // area. The reason for the encapsulation is to help with naming and to allow |
| // future uses for read barriers. |
| |
| class OopHandle { |
| private: |
| oop* _obj; |
| |
| public: |
| OopHandle() : _obj(NULL) {} |
| OopHandle(oop* w) : _obj(w) {} |
| |
| oop resolve() const { return (_obj == NULL) ? (oop)NULL : *_obj; } |
| |
| // Used only for removing handle. |
| oop* ptr_raw() { return _obj; } |
| }; |
| |
| #endif // SHARE_VM_OOPS_OOPHANDLE_HPP |