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 21 * questions. 22 * 23 */ 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 inline oop OopHandle::cmpxchg(oop old_value, oop new_value) { 69 return NativeAccess<MO_SEQ_CST>::oop_atomic_cmpxchg(_obj, old_value, new_value); 70 } 71 72 #endif // SHARE_OOPS_OOPHANDLE_INLINE_HPP