1 /* 2 * Copyright (c) 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; 26 27 import org.graalvm.compiler.api.replacements.ClassSubstitution; 28 import org.graalvm.compiler.api.replacements.MethodSubstitution; 29 import org.graalvm.compiler.core.common.SuppressFBWarnings; 30 import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin; 31 import org.graalvm.compiler.nodes.java.LoadFieldNode; 32 import org.graalvm.compiler.replacements.nodes.ArrayEqualsNode; 33 34 // JaCoCo Exclude 35 36 /** 37 * Substitutions for {@link String} methods for JDK9 and later. 38 * 39 * {@link String} changed in JDK9 to contain a byte array instead of a char array. We therefore need 40 * new substitutions for the related methods. 41 */ 42 @ClassSubstitution(String.class) 43 public class JDK9StringSubstitutions { 44 45 @MethodSubstitution(isStatic = false) 46 @SuppressFBWarnings(value = "ES_COMPARING_PARAMETER_STRING_WITH_EQ", justification = "reference equality on the receiver is what we want") 47 public static boolean equals(final String thisString, Object obj) { 48 if (thisString == obj) { 49 return true; 50 } 51 if (!(obj instanceof String)) { 52 return false; 53 } 54 String thatString = (String) obj; 55 if (thisString.length() != thatString.length()) { 56 return false; 57 } 58 59 if (thisString.length() == 0) { 60 return true; 61 } 62 if (getCoder(thisString) != getCoder(thatString)) { 63 return false; 64 } 65 66 final byte[] array1 = getValue(thisString); 67 final byte[] array2 = getValue(thatString); 68 69 return ArrayEqualsNode.equals(array1, array2, array1.length); 70 } 71 72 /** 73 * Will be intrinsified with an {@link InvocationPlugin} to a {@link LoadFieldNode}. 74 */ 75 public static native byte[] getValue(String s); 76 77 public static native int getCoder(String s); 78 }