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78b80150e0
Co-authored-by: Patricio Chilano Mateo <pchilanomate@openjdk.org> Co-authored-by: Alan Bateman <alanb@openjdk.org> Co-authored-by: Andrew Haley <aph@openjdk.org> Co-authored-by: Fei Yang <fyang@openjdk.org> Co-authored-by: Coleen Phillimore <coleenp@openjdk.org> Co-authored-by: Richard Reingruber <rrich@openjdk.org> Co-authored-by: Martin Doerr <mdoerr@openjdk.org> Reviewed-by: aboldtch, dholmes, coleenp, fbredberg, dlong, sspitsyn
80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/*
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* Copyright (c) 2017, 2024, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_OOPS_OOPHANDLE_HPP
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#define SHARE_OOPS_OOPHANDLE_HPP
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#include "metaprogramming/primitiveConversions.hpp"
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#include "oops/oopsHierarchy.hpp"
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#include <type_traits>
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class OopStorage;
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// Simple classes for wrapping oop and atomically accessed oop pointers
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// stored in OopStorage, or stored in the ClassLoaderData handles area.
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// These classes help with allocation, release, and NativeAccess loads and
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// stores with the appropriate barriers.
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class OopHandle {
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friend class VMStructs;
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private:
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oop* _obj;
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public:
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OopHandle() : _obj(nullptr) {}
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explicit OopHandle(oop* w) : _obj(w) {}
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OopHandle(OopStorage* storage, oop obj);
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OopHandle(const OopHandle& copy) : _obj(copy._obj) {}
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OopHandle& operator=(const OopHandle& copy) {
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// Allow "this" to be junk if copy is empty; needed by initialization of
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// raw memory in hashtables.
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assert(is_empty() || copy.is_empty(), "can only copy if empty");
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_obj = copy._obj;
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return *this;
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}
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void swap(OopHandle& copy) {
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::swap(_obj, copy._obj);
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}
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inline oop resolve() const;
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inline oop peek() const;
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bool is_empty() const { return _obj == nullptr; }
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inline void release(OopStorage* storage);
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inline void replace(oop obj);
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inline oop xchg(oop new_value);
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inline oop cmpxchg(oop old_value, oop new_value);
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oop* ptr_raw() const { return _obj; }
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};
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#endif // SHARE_OOPS_OOPHANDLE_HPP
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