83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018, 2022, 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_GC_SHARED_BARRIERSETNMETHOD_HPP
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#define SHARE_GC_SHARED_BARRIERSETNMETHOD_HPP
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#include "memory/allocation.hpp"
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#include "oops/oopsHierarchy.hpp"
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#include "utilities/formatBuffer.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/sizes.hpp"
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class nmethod;
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class BarrierSetNMethod: public CHeapObj<mtGC> {
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private:
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int _current_phase;
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enum {
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not_entrant = 1 << 31, // armed sticky bit, see make_not_entrant
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armed = 0,
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initial = 1,
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};
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void deoptimize(nmethod* nm, address* return_addr_ptr);
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protected:
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virtual int guard_value(nmethod* nm);
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void set_guard_value(nmethod* nm, int value);
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public:
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BarrierSetNMethod() : _current_phase(initial) {}
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bool supports_entry_barrier(nmethod* nm);
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virtual bool nmethod_entry_barrier(nmethod* nm);
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virtual ByteSize thread_disarmed_guard_value_offset() const;
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virtual int* disarmed_guard_value_address() const;
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int disarmed_guard_value() const;
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static int nmethod_stub_entry_barrier(address* return_address_ptr);
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bool nmethod_osr_entry_barrier(nmethod* nm);
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virtual bool is_armed(nmethod* nm);
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void arm(nmethod* nm) { arm_with(nm, armed); }
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void disarm(nmethod* nm);
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virtual void make_not_entrant(nmethod* nm);
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virtual bool is_not_entrant(nmethod* nm);
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virtual void arm_with(nmethod* nm, int value);
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virtual void arm_all_nmethods();
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virtual oop oop_load_no_keepalive(const nmethod* nm, int index);
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virtual oop oop_load_phantom(const nmethod* nm, int index);
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#if INCLUDE_JVMCI
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bool verify_barrier(nmethod* nm, FormatBuffer<>& msg);
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#endif
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};
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#endif // SHARE_GC_SHARED_BARRIERSETNMETHOD_HPP
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