author | pliden |
Mon, 18 Mar 2019 11:50:40 +0100 | |
changeset 54170 | 8f1771ea1e39 |
parent 50875 | 2217b2fc29ea |
child 58066 | 8407928b9fe5 |
permissions | -rw-r--r-- |
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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_ZMARKSTACKENTRY_HPP |
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#define SHARE_GC_Z_ZMARKSTACKENTRY_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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// Mark stack entry layout |
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// ----------------------- |
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// |
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// Object entry |
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// ------------ |
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// |
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// 6 |
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// 3 2 1 0 |
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// +---------------------------------------------------------------------+-+-+ |
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// |11111111 11111111 11111111 11111111 11111111 11111111 11111111 111111|1|1| |
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// +---------------------------------------------------------------------+-+-+ |
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// | | | |
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// | 1-1 Partial Array Flag (1-bit) * | |
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// | | |
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// | 0-0 Final Flag (1-bit) * |
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// | |
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// * 63-2 Object Address (62-bits) |
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// |
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// |
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// Partial array entry |
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// ------------------- |
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// |
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// 6 3 3 |
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// 3 2 1 2 1 0 |
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// +------------------------------------+---------------------------------+-+-+ |
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// |11111111 11111111 11111111 11111111 |11111111 11111111 11111111 111111|1|1| |
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// +------------------------------------+---------------------------------+-+-+ |
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// | | | | |
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// | | 1-1 Partial Array Flag (1-bit) * | |
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// | | | |
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// | | 0-0 Final Flag (1-bit) * |
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// | | |
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// | * 31-2 Partial Array Length (30-bits) |
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// | |
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// * 63-32 Partial Array Address Offset (32-bits) |
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// |
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class ZMarkStackEntry { |
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private: |
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typedef ZBitField<uint64_t, bool, 0, 1> field_finalizable; |
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typedef ZBitField<uint64_t, bool, 1, 1> field_partial_array; |
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typedef ZBitField<uint64_t, uintptr_t, 2, 62> field_object_address; |
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typedef ZBitField<uint64_t, size_t, 2, 30> field_partial_array_length; |
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typedef ZBitField<uint64_t, size_t, 32, 32> field_partial_array_offset; |
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uint64_t _entry; |
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public: |
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ZMarkStackEntry() { |
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// This constructor is intentionally left empty and does not initialize |
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// _entry to allow it to be optimized out when instantiating ZMarkStack, |
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// which has a long array of ZMarkStackEntry elements, but doesn't care |
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// what _entry is initialized to. |
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} |
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ZMarkStackEntry(uintptr_t object_address, bool finalizable) : |
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_entry(field_object_address::encode(object_address) | |
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field_partial_array::encode(false) | |
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field_finalizable::encode(finalizable)) {} |
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ZMarkStackEntry(size_t partial_array_offset, size_t partial_array_length, bool finalizable) : |
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_entry(field_partial_array_offset::encode(partial_array_offset) | |
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field_partial_array_length::encode(partial_array_length) | |
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field_partial_array::encode(true) | |
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field_finalizable::encode(finalizable)) {} |
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bool finalizable() const { |
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return field_finalizable::decode(_entry); |
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} |
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bool partial_array() const { |
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return field_partial_array::decode(_entry); |
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} |
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size_t partial_array_offset() const { |
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return field_partial_array_offset::decode(_entry); |
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} |
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size_t partial_array_length() const { |
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return field_partial_array_length::decode(_entry); |
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} |
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uintptr_t object_address() const { |
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return field_object_address::decode(_entry); |
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} |
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}; |
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#endif // SHARE_GC_Z_ZMARKSTACKENTRY_HPP |