001/*
002 * Copyright (c) 2014, 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.test;
024
025import jdk.internal.jvmci.code.*;
026import jdk.internal.jvmci.meta.*;
027
028import org.junit.*;
029
030import com.oracle.graal.nodes.*;
031import com.oracle.graal.replacements.*;
032import com.oracle.graal.replacements.nodes.*;
033
034/**
035 * Tests {@link StringSubstitutions}.
036 */
037public class StringSubstitutionsTest extends MethodSubstitutionTest {
038
039    public void testSubstitution(String testMethodName, Class<?> intrinsicClass, Class<?> holder, String methodName, boolean optional, Object[] args1, Object[] args2) {
040        ResolvedJavaMethod realMethod = getResolvedJavaMethod(holder, methodName);
041        ResolvedJavaMethod testMethod = getResolvedJavaMethod(testMethodName);
042        StructuredGraph graph = testGraph(testMethodName);
043
044        // Check to see if the resulting graph contains the expected node
045        StructuredGraph replacement = getReplacements().getSubstitution(realMethod, -1);
046        if (replacement == null && !optional) {
047            assertInGraph(graph, intrinsicClass);
048        }
049
050        // Force compilation
051        InstalledCode code = getCode(testMethod);
052        assert optional || code != null;
053
054        for (int i = 0; i < args1.length; i++) {
055            Object arg1 = args1[i];
056            Object arg2 = args2[i];
057            Object expected = invokeSafe(realMethod, arg1, arg2);
058            // Verify that the original method and the substitution produce the same value
059            assertDeepEquals(expected, invokeSafe(testMethod, null, arg1, arg2));
060            // Verify that the generated code and the original produce the same value
061            assertDeepEquals(expected, executeVarargsSafe(code, arg1, arg2));
062        }
063    }
064
065    @Test
066    public void testEquals() {
067        final int n = 1000;
068        Object[] args1 = new Object[n];
069        Object[] args2 = new Object[n];
070
071        // equal strings
072        String s1 = "";
073        String s2 = "";
074        for (int i = 0; i < n / 2; i++) {
075            args1[i] = s1;
076            args2[i] = s2;
077            s1 = s1 + "0";
078            s2 = s2 + "0";
079        }
080
081        // non-equal strings
082        s1 = "";
083        s2 = "";
084        for (int i = n / 2; i < n; i++) {
085            args1[i] = s1;
086            args2[i] = s2;
087            s2 = s1 + "1";
088            s1 = s1 + "0";
089        }
090
091        testSubstitution("stringEquals", ArrayEqualsNode.class, String.class, "equals", false, args1, args2);
092    }
093
094    @SuppressWarnings("all")
095    public static boolean stringEquals(String a, String b) {
096        return a.equals(b);
097    }
098
099}