1 /* 2 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 package jdk.internal.vm.compiler.word; 42 43 import jdk.internal.vm.compiler.word.impl.WordBoxFactory; 44 import jdk.internal.vm.compiler.word.impl.WordFactoryOpcode; 45 import jdk.internal.vm.compiler.word.impl.WordFactoryOperation; 46 47 /** 48 * Provides factory method to create machine-word-sized values. 49 * 50 * @since 1.0 51 */ 52 public final class WordFactory { 53 54 private WordFactory() { 55 } 56 57 /** 58 * The constant 0, i.e., the word with no bits set. There is no difference between a signed and 59 * unsigned zero. 60 * 61 * @return the constant 0. 62 * 63 * @since 1.0 64 */ 65 @WordFactoryOperation(opcode = WordFactoryOpcode.ZERO) 66 public static <T extends WordBase> T zero() { 67 return WordBoxFactory.box(0L); 68 } 69 70 /** 71 * The null pointer, i.e., the pointer with no bits set. There is no difference to a signed or 72 * unsigned {@link #zero}. 73 * 74 * @return the null pointer. 75 * 76 * @since 1.0 77 */ 78 @WordFactoryOperation(opcode = WordFactoryOpcode.ZERO) 79 public static <T extends PointerBase> T nullPointer() { 80 return WordBoxFactory.box(0L); 81 } 82 83 /** 84 * Unsafe conversion from a Java long value to a Word. The parameter is treated as an unsigned 85 * 64-bit value (in contrast to the semantics of a Java long). 86 * 87 * @param val a 64 bit unsigned value 88 * @return the value cast to Word 89 * 90 * @since 1.0 91 */ 92 @WordFactoryOperation(opcode = WordFactoryOpcode.FROM_UNSIGNED) 93 public static <T extends UnsignedWord> T unsigned(long val) { 94 return WordBoxFactory.box(val); 95 } 96 97 /** 98 * Unsafe conversion from a Java long value to a {@link PointerBase pointer}. The parameter is 99 * treated as an unsigned 64-bit value (in contrast to the semantics of a Java long). 100 * 101 * @param val a 64 bit unsigned value 102 * @return the value cast to PointerBase 103 * 104 * @since 1.0 105 */ 106 @WordFactoryOperation(opcode = WordFactoryOpcode.FROM_UNSIGNED) 107 public static <T extends PointerBase> T pointer(long val) { 108 return WordBoxFactory.box(val); 109 } 110 111 /** 112 * Unsafe conversion from a Java int value to a Word. The parameter is treated as an unsigned 113 * 32-bit value (in contrast to the semantics of a Java int). 114 * 115 * @param val a 32 bit unsigned value 116 * @return the value cast to Word 117 * 118 * @since 1.0 119 */ 120 @WordFactoryOperation(opcode = WordFactoryOpcode.FROM_UNSIGNED) 121 public static <T extends UnsignedWord> T unsigned(int val) { 122 return WordBoxFactory.box(val & 0xffffffffL); 123 } 124 125 /** 126 * Unsafe conversion from a Java long value to a Word. The parameter is treated as a signed 127 * 64-bit value (unchanged semantics of a Java long). 128 * 129 * @param val a 64 bit signed value 130 * @return the value cast to Word 131 * 132 * @since 1.0 133 */ 134 @WordFactoryOperation(opcode = WordFactoryOpcode.FROM_SIGNED) 135 public static <T extends SignedWord> T signed(long val) { 136 return WordBoxFactory.box(val); 137 } 138 139 /** 140 * Unsafe conversion from a Java int value to a Word. The parameter is treated as a signed 141 * 32-bit value (unchanged semantics of a Java int). 142 * 143 * @param val a 32 bit signed value 144 * @return the value cast to Word 145 * 146 * @since 1.0 147 */ 148 @WordFactoryOperation(opcode = WordFactoryOpcode.FROM_SIGNED) 149 public static <T extends SignedWord> T signed(int val) { 150 return WordBoxFactory.box(val); 151 } 152 }