106 lines
4.1 KiB
C++
106 lines
4.1 KiB
C++
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/*
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* Copyright (c) 2017, 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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#ifndef SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP
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#define SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP
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#include "gc/z/zBitField.hpp"
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#include "memory/allocation.hpp"
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//
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// NMethod table entry layout
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// --------------------------
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//
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// 6
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// 3 3 2 1 0
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// +--------------------------------------------------------------------+-+-+-+
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// |11111111 11111111 11111111 11111111 11111111 11111111 11111111 11111|1|1|1|
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// +--------------------------------------------------------------------+-+-+-+
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// | | | |
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// | 2-2 Non-immediate Oops Flag (1-bits) * | |
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// | | |
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// | 1-1 Immediate Oops/Unregistered Flag (1-bits) * |
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// | |
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// | 0-0 Registered Flag (1-bits) *
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// |
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// * 63-3 NMethod/ZNMethodWithImmediateOops Address (61-bits)
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//
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class nmethod;
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class ZNMethodWithImmediateOops;
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class ZNMethodTableEntry : public CHeapObj<mtGC> {
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private:
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typedef ZBitField<uint64_t, bool, 0, 1> field_registered;
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typedef ZBitField<uint64_t, bool, 1, 1> field_unregistered;
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typedef ZBitField<uint64_t, bool, 1, 1> field_immediate_oops;
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typedef ZBitField<uint64_t, bool, 2, 1> field_non_immediate_oops;
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typedef ZBitField<uint64_t, nmethod*, 3, 61, 3> field_method;
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typedef ZBitField<uint64_t, ZNMethodWithImmediateOops*, 3, 61, 3> field_method_with_immediate_oops;
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uint64_t _entry;
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public:
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ZNMethodTableEntry(bool unregistered = false) :
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_entry(field_unregistered::encode(unregistered) |
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field_registered::encode(false)) {}
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ZNMethodTableEntry(nmethod* method, bool non_immediate_oops) :
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_entry(field_method::encode(method) |
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field_non_immediate_oops::encode(non_immediate_oops) |
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field_immediate_oops::encode(false) |
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field_registered::encode(true)) {}
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ZNMethodTableEntry(ZNMethodWithImmediateOops* method_with_immediate_oops, bool non_immediate_oops) :
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_entry(field_method_with_immediate_oops::encode(method_with_immediate_oops) |
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field_non_immediate_oops::encode(non_immediate_oops) |
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field_immediate_oops::encode(true) |
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field_registered::encode(true)) {}
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bool registered() const {
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return field_registered::decode(_entry);
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}
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bool unregistered() const {
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return field_unregistered::decode(_entry);
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}
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bool immediate_oops() const {
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return field_immediate_oops::decode(_entry);
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}
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bool non_immediate_oops() const {
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return field_non_immediate_oops::decode(_entry);
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}
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nmethod* method() const {
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return field_method::decode(_entry);
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}
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ZNMethodWithImmediateOops* method_with_immediate_oops() const {
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return field_method_with_immediate_oops::decode(_entry);
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}
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};
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#endif // SHARE_GC_Z_ZNMETHODTABLEENTRY_HPP
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