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/*
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* Copyright (c) 2012, 2019, 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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package jdk.internal.vm.compiler.word;
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import jdk.internal.vm.compiler.word.impl.WordBoxFactory;
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import jdk.internal.vm.compiler.word.impl.WordFactoryOpcode;
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import jdk.internal.vm.compiler.word.impl.WordFactoryOperation;
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/**
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* Provides factory method to create machine-word-sized values.
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*
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* @since 19.0
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*/
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public final class WordFactory {
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private WordFactory() {
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}
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/**
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* The constant 0, i.e., the word with no bits set. There is no difference between a signed and
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* unsigned zero.
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*
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* @return the constant 0.
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*
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* @since 19.0
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*/
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@WordFactoryOperation(opcode = WordFactoryOpcode.ZERO)
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public static <T extends WordBase> T zero() {
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return WordBoxFactory.box(0L);
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}
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/**
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* The null pointer, i.e., the pointer with no bits set. There is no difference to a signed or
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* unsigned {@link #zero}.
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*
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* @return the null pointer.
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*
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* @since 19.0
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*/
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@WordFactoryOperation(opcode = WordFactoryOpcode.ZERO)
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public static <T extends PointerBase> T nullPointer() {
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return WordBoxFactory.box(0L);
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}
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/**
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* Unsafe conversion from a Java long value to a Word. The parameter is treated as an unsigned
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* 64-bit value (in contrast to the semantics of a Java long).
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*
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* @param val a 64 bit unsigned value
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* @return the value cast to Word
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*
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* @since 19.0
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*/
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@WordFactoryOperation(opcode = WordFactoryOpcode.FROM_UNSIGNED)
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public static <T extends UnsignedWord> T unsigned(long val) {
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return WordBoxFactory.box(val);
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}
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/**
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* Unsafe conversion from a Java long value to a {@link PointerBase pointer}. The parameter is
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* treated as an unsigned 64-bit value (in contrast to the semantics of a Java long).
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*
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* @param val a 64 bit unsigned value
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* @return the value cast to PointerBase
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*
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* @since 19.0
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*/
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@WordFactoryOperation(opcode = WordFactoryOpcode.FROM_UNSIGNED)
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public static <T extends PointerBase> T pointer(long val) {
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return WordBoxFactory.box(val);
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}
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/**
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* Unsafe conversion from a Java int value to a Word. The parameter is treated as an unsigned
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* 32-bit value (in contrast to the semantics of a Java int).
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*
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* @param val a 32 bit unsigned value
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* @return the value cast to Word
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*
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* @since 19.0
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*/
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@WordFactoryOperation(opcode = WordFactoryOpcode.FROM_UNSIGNED)
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public static <T extends UnsignedWord> T unsigned(int val) {
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return WordBoxFactory.box(val & 0xffffffffL);
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}
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/**
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* Unsafe conversion from a Java long value to a Word. The parameter is treated as a signed
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* 64-bit value (unchanged semantics of a Java long).
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*
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* @param val a 64 bit signed value
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* @return the value cast to Word
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*
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* @since 19.0
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*/
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@WordFactoryOperation(opcode = WordFactoryOpcode.FROM_SIGNED)
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public static <T extends SignedWord> T signed(long val) {
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return WordBoxFactory.box(val);
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}
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/**
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* Unsafe conversion from a Java int value to a Word. The parameter is treated as a signed
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* 32-bit value (unchanged semantics of a Java int).
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*
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* @param val a 32 bit signed value
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* @return the value cast to Word
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*
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* @since 19.0
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*/
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@WordFactoryOperation(opcode = WordFactoryOpcode.FROM_SIGNED)
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public static <T extends SignedWord> T signed(int val) {
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return WordBoxFactory.box(val);
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}
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}
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