1 /*
 2  * Copyright (c) 2018, 2024, 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
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24 
25 #ifndef SHARE_OOPS_OOPHANDLE_INLINE_HPP
26 #define SHARE_OOPS_OOPHANDLE_INLINE_HPP
27 
28 #include "oops/oopHandle.hpp"
29 
30 #include "oops/access.inline.hpp"
31 #include "gc/shared/oopStorage.inline.hpp"
32 
33 inline oop OopHandle::resolve() const {
34   return (_obj == nullptr) ? (oop)nullptr : NativeAccess<>::oop_load(_obj);
35 }
36 
37 inline oop OopHandle::peek() const {
38   return (_obj == nullptr) ? (oop)nullptr : NativeAccess<AS_NO_KEEPALIVE>::oop_load(_obj);
39 }
40 
41 inline OopHandle::OopHandle(OopStorage* storage, oop obj) :
42     _obj(storage->allocate()) {
43   if (_obj == nullptr) {
44     vm_exit_out_of_memory(sizeof(oop), OOM_MALLOC_ERROR,
45                           "Cannot create oop handle");
46   }
47   NativeAccess<>::oop_store(_obj, obj);
48 }
49 
50 inline void OopHandle::release(OopStorage* storage) {
51   if (_obj != nullptr) {
52     // Clear the OopHandle first
53     NativeAccess<>::oop_store(_obj, nullptr);
54     storage->release(_obj);
55     _obj = nullptr;
56   }
57 }
58 
59 inline void OopHandle::replace(oop obj) {
60   assert(!is_empty(), "should not use replace");
61   NativeAccess<>::oop_store(_obj, obj);
62 }
63 
64 inline oop OopHandle::xchg(oop new_value) {
65   return NativeAccess<MO_SEQ_CST>::oop_atomic_xchg(_obj, new_value);
66 }
67 
68 #endif // SHARE_OOPS_OOPHANDLE_INLINE_HPP