1/*
2 * Copyright (c) 2017, 2019, 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,
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23 */
24
25#ifndef SHARE_OOPS_OOPHANDLE_HPP
26#define SHARE_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
38class OopHandle {
39 friend class VMStructs;
40private:
41 oop* _obj;
42
43public:
44 OopHandle() : _obj(NULL) {}
45 OopHandle(oop* w) : _obj(w) {}
46
47 inline oop resolve() const;
48 inline oop peek() const;
49
50 // Used only for removing handle.
51 oop* ptr_raw() const { return _obj; }
52};
53
54#endif // SHARE_OOPS_OOPHANDLE_HPP
55