1 /* 2 * Copyright (c) 2013, 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 package org.graalvm.compiler.replacements.amd64; 26 27 import org.graalvm.compiler.api.replacements.ClassSubstitution; 28 import org.graalvm.compiler.api.replacements.Fold; 29 import org.graalvm.compiler.api.replacements.Fold.InjectedParameter; 30 import org.graalvm.compiler.api.replacements.MethodSubstitution; 31 import org.graalvm.compiler.core.common.SuppressFBWarnings; 32 import org.graalvm.compiler.graph.Node.ConstantNodeParameter; 33 import org.graalvm.compiler.replacements.StringSubstitutions; 34 import org.graalvm.compiler.replacements.nodes.ArrayCompareToNode; 35 import org.graalvm.compiler.replacements.nodes.ArrayRegionEqualsNode; 36 import org.graalvm.compiler.word.Word; 37 import jdk.internal.vm.compiler.word.Pointer; 38 39 import jdk.vm.ci.meta.JavaKind; 40 import jdk.vm.ci.meta.MetaAccessProvider; 41 42 // JaCoCo Exclude 43 44 /** 45 * Substitutions for {@link java.lang.String} methods. 46 */ 47 @ClassSubstitution(String.class) 48 public class AMD64StringSubstitutions { 49 50 @Fold 51 static int charArrayBaseOffset(@InjectedParameter MetaAccessProvider metaAccess) { 52 return metaAccess.getArrayBaseOffset(JavaKind.Char); 53 } 54 55 @Fold 56 static int charArrayIndexScale(@InjectedParameter MetaAccessProvider metaAccess) { 57 return metaAccess.getArrayIndexScale(JavaKind.Char); 58 } 59 60 /** Marker value for the {@link InjectedParameter} injected parameter. */ 61 static final MetaAccessProvider INJECTED = null; 62 63 // Only exists in JDK <= 8 64 @MethodSubstitution(isStatic = true, optional = true) 65 public static int indexOf(char[] source, int sourceOffset, int sourceCount, 66 @ConstantNodeParameter char[] target, int targetOffset, int targetCount, 67 int origFromIndex) { 68 int fromIndex = origFromIndex; 69 if (fromIndex >= sourceCount) { 70 return (targetCount == 0 ? sourceCount : -1); 71 } 72 if (fromIndex < 0) { 73 fromIndex = 0; 74 } 75 if (targetCount == 0) { 76 // The empty string is in every string. 77 return fromIndex; 78 } 79 80 int totalOffset = sourceOffset + fromIndex; 81 if (sourceCount - fromIndex < targetCount) { 82 // The empty string contains nothing except the empty string. 83 return -1; 84 } 85 assert sourceCount - fromIndex > 0 && targetCount > 0; 86 87 if (targetCount == 1) { 88 Pointer sourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED)); 89 int indexOfResult = AMD64ArrayIndexOf.indexOf1Char(sourcePointer, sourceCount - fromIndex, target[targetOffset]); 90 if (indexOfResult >= 0) { 91 return indexOfResult + totalOffset; 92 } 93 return indexOfResult; 94 } else if (targetCount == 2) { 95 Pointer sourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED)); 96 int indexOfResult = AMD64ArrayIndexOf.indexOfTwoConsecutiveChars(sourcePointer, sourceCount - fromIndex, target[targetOffset], target[targetOffset + 1]); 97 if (indexOfResult >= 0) { 98 return indexOfResult + totalOffset; 99 } 100 return indexOfResult; 101 } else { 102 int haystackLength = sourceCount - (fromIndex + (targetCount - 2)); 103 while (haystackLength > 0) { 104 Pointer sourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED)); 105 int indexOfResult = AMD64ArrayIndexOf.indexOfTwoConsecutiveChars(sourcePointer, haystackLength, target[targetOffset], target[targetOffset + 1]); 106 if (indexOfResult < 0) { 107 return -1; 108 } 109 totalOffset += indexOfResult; 110 haystackLength -= (indexOfResult + 1); 111 Pointer cmpSourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED)); 112 Pointer targetPointer = Word.objectToTrackedPointer(target).add(charArrayBaseOffset(INJECTED)).add(targetOffset * charArrayIndexScale(INJECTED)); 113 if (ArrayRegionEqualsNode.regionEquals(cmpSourcePointer, targetPointer, targetCount, JavaKind.Char)) { 114 return totalOffset; 115 } 116 totalOffset++; 117 } 118 return -1; 119 } 120 } 121 122 // Only exists in JDK <= 8 123 @MethodSubstitution(isStatic = false, optional = true) 124 public static int indexOf(String source, int ch, int origFromIndex) { 125 int fromIndex = origFromIndex; 126 final int sourceCount = source.length(); 127 if (fromIndex >= sourceCount) { 128 // Note: fromIndex might be near -1>>>1. 129 return -1; 130 } 131 if (fromIndex < 0) { 132 fromIndex = 0; 133 } 134 135 if (ch < Character.MIN_SUPPLEMENTARY_CODE_POINT) { 136 char[] sourceArray = StringSubstitutions.getValue(source); 137 138 Pointer sourcePointer = Word.objectToTrackedPointer(sourceArray).add(charArrayBaseOffset(INJECTED)).add(fromIndex * charArrayIndexScale(INJECTED)); 139 int result = AMD64ArrayIndexOf.indexOf1Char(sourcePointer, sourceCount - fromIndex, (char) ch); 140 if (result != -1) { 141 return result + fromIndex; 142 } 143 return result; 144 } else { 145 return indexOf(source, ch, origFromIndex); 146 } 147 } 148 149 @MethodSubstitution(isStatic = false) 150 @SuppressFBWarnings(value = "ES_COMPARING_PARAMETER_STRING_WITH_EQ", justification = "reference equality on the receiver is what we want") 151 public static int compareTo(String receiver, String anotherString) { 152 if (receiver == anotherString) { 153 return 0; 154 } 155 char[] value = StringSubstitutions.getValue(receiver); 156 char[] other = StringSubstitutions.getValue(anotherString); 157 return ArrayCompareToNode.compareTo(value, other, value.length << 1, other.length << 1, JavaKind.Char, JavaKind.Char); 158 } 159 160 }