001/*
002 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.replacements;
024
025import com.oracle.graal.compiler.common.*;
026import com.oracle.graal.graphbuilderconf.*;
027import com.oracle.graal.nodes.java.*;
028import com.oracle.graal.replacements.nodes.*;
029
030// JaCoCo Exclude
031
032/**
033 * Substitutions for {@link java.lang.String} methods.
034 */
035public class StringSubstitutions {
036
037    @SuppressFBWarnings(value = "ES_COMPARING_PARAMETER_STRING_WITH_EQ", justification = "reference equality on the receiver is what we want")
038    public static boolean equals(final String thisString, Object obj) {
039        if (thisString == obj) {
040            return true;
041        }
042        if (!(obj instanceof String)) {
043            return false;
044        }
045        String thatString = (String) obj;
046        if (thisString.length() != thatString.length()) {
047            return false;
048        }
049        if (thisString.length() == 0) {
050            return true;
051        }
052
053        final char[] array1 = getValue(thisString);
054        final char[] array2 = getValue(thatString);
055
056        return ArrayEqualsNode.equals(array1, array2, array1.length);
057    }
058
059    /**
060     * Will be intrinsified with an {@link InvocationPlugin} to a {@link LoadFieldNode}.
061     */
062    private static native char[] getValue(String s);
063}