1 /* 2 * Copyright (c) 2013, 2015, 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 package org.graalvm.compiler.replacements; 24 25 import org.graalvm.compiler.api.replacements.ClassSubstitution; 26 import org.graalvm.compiler.api.replacements.MethodSubstitution; 27 import org.graalvm.compiler.core.common.SuppressFBWarnings; 28 import org.graalvm.compiler.nodes.graphbuilderconf.InvocationPlugin; 29 import org.graalvm.compiler.nodes.java.LoadFieldNode; 30 import org.graalvm.compiler.replacements.nodes.ArrayEqualsNode; 31 32 // JaCoCo Exclude 33 34 /** 35 * Substitutions for {@link java.lang.String} methods. 36 */ 37 @ClassSubstitution(String.class) 38 public class StringSubstitutions { 39 40 @MethodSubstitution(isStatic = false) 41 @SuppressFBWarnings(value = "ES_COMPARING_PARAMETER_STRING_WITH_EQ", justification = "reference equality on the receiver is what we want") 42 public static boolean equals(final String thisString, Object obj) { 43 if (thisString == obj) { 44 return true; 45 } 46 if (!(obj instanceof String)) { 47 return false; 48 } 49 String thatString = (String) obj; 50 if (thisString.length() != thatString.length()) { 51 return false; 52 } 53 if (thisString.length() == 0) { 54 return true; 55 } 56 57 final char[] array1 = getValue(thisString); 58 final char[] array2 = getValue(thatString); 59 60 return ArrayEqualsNode.equals(array1, array2, array1.length); 61 } 62 63 /** 64 * Will be intrinsified with an {@link InvocationPlugin} to a {@link LoadFieldNode}. 65 */ 66 private static native char[] getValue(String s); 67 }