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.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
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24
25#ifndef SHARE_GC_SHARED_ACCESSBARRIERSUPPORT_HPP
26#define SHARE_GC_SHARED_ACCESSBARRIERSUPPORT_HPP
27
28#include "memory/allocation.hpp"
29#include "oops/access.hpp"
30
31class AccessBarrierSupport: AllStatic {
32private:
33 static DecoratorSet resolve_unknown_oop_ref_strength(DecoratorSet decorators, oop base, ptrdiff_t offset);
34
35public:
36 // Some collectors, like G1, needs to keep referents alive when loading them.
37 // Therefore, for APIs that accept unknown oop ref strength (e.g. unsafe),
38 // we need to dynamically find out if a given field is on a java.lang.ref.Reference object.
39 // and in that case what strength it has.
40 template<DecoratorSet decorators>
41 static DecoratorSet resolve_possibly_unknown_oop_ref_strength(oop base, ptrdiff_t offset);
42};
43
44#endif // SHARE_GC_SHARED_ACCESSBARRIERSUPPORT_HPP
45