1 /* 2 * Copyright (c) 2012, 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.jtt.loop; 26 27 import org.junit.Test; 28 29 import org.graalvm.compiler.jtt.JTTTest; 30 31 /* 32 * see java.lang.String.lastIndexOf(char[], int, int, char[], int ,int, int) 33 */ 34 public class LoopLastIndexOf extends JTTTest { 35 36 private static final char[] v1 = new char[]{'a', 'b', 'c', 'd', 'a', 'b', 'c', 'd', 'a', 'b', 'c', 'd'}; 37 private static final char[] v2 = new char[]{'d', 'a'}; 38 private static final char[] v3 = new char[]{'d', 'b', 'c'}; 39 private static final char[] v4 = new char[]{'z', 'a', 'b', 'c'}; 40 test(char[] source, int sourceOffset, int sourceCount, char[] target, int targetOffset, int targetCount, int fromIndexParam)41 public static int test(char[] source, int sourceOffset, int sourceCount, char[] target, int targetOffset, int targetCount, int fromIndexParam) { 42 int rightIndex = sourceCount - targetCount; 43 int fromIndex = fromIndexParam; 44 if (fromIndex < 0) { 45 return -1; 46 } 47 if (fromIndex > rightIndex) { 48 fromIndex = rightIndex; 49 } 50 /* Empty string always matches. */ 51 if (targetCount == 0) { 52 return fromIndex; 53 } 54 55 int strLastIndex = targetOffset + targetCount - 1; 56 char strLastChar = target[strLastIndex]; 57 int min = sourceOffset + targetCount - 1; 58 int i = min + fromIndex; 59 60 startSearchForLastChar: while (true) { 61 while (i >= min && source[i] != strLastChar) { 62 i--; 63 } 64 if (i < min) { 65 return -1; 66 } 67 int j = i - 1; 68 int start = j - (targetCount - 1); 69 int k = strLastIndex - 1; 70 71 while (j > start) { 72 if (source[j--] != target[k--]) { 73 i--; 74 continue startSearchForLastChar; 75 } 76 } 77 return start - sourceOffset + 1; 78 } 79 } 80 81 @Test run0()82 public void run0() throws Throwable { 83 runTest("test", v1, 0, v1.length, v2, 0, v2.length, 10); 84 } 85 86 @Test run1()87 public void run1() throws Throwable { 88 runTest("test", v1, 0, v1.length, v3, 0, v3.length, 10); 89 } 90 91 @Test run2()92 public void run2() throws Throwable { 93 runTest("test", v1, 0, v1.length, v4, 0, v4.length, 10); 94 } 95 96 @Test run3()97 public void run3() throws Throwable { 98 runTest("test", v1, 1, v1.length - 1, v3, 0, v3.length, 10); 99 } 100 101 @Test 102 // (expected = ArrayIndexOutOfBoundsException.class) run4()103 public void run4() throws Throwable { 104 runTest("test", v1, 1, v1.length, v3, 0, v3.length, 10); 105 } 106 } 107