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 package org.graalvm.compiler.jtt.loop; 24 25 import org.junit.Test; 26 27 import org.graalvm.compiler.jtt.JTTTest; 28 29 /* 30 * see java.lang.String.lastIndexOf(char[], int, int, char[], int ,int, int) 31 */ 32 public class LoopLastIndexOf extends JTTTest { 33 34 private static final char[] v1 = new char[]{'a', 'b', 'c', 'd', 'a', 'b', 'c', 'd', 'a', 'b', 'c', 'd'}; 35 private static final char[] v2 = new char[]{'d', 'a'}; 36 private static final char[] v3 = new char[]{'d', 'b', 'c'}; 37 private static final char[] v4 = new char[]{'z', 'a', 'b', 'c'}; 38 39 public static int test(char[] source, int sourceOffset, int sourceCount, char[] target, int targetOffset, int targetCount, int fromIndexParam) { 40 int rightIndex = sourceCount - targetCount; 41 int fromIndex = fromIndexParam; 42 if (fromIndex < 0) { 43 return -1; 44 } 45 if (fromIndex > rightIndex) { 46 fromIndex = rightIndex; 47 } 48 /* Empty string always matches. */ 49 if (targetCount == 0) { 50 return fromIndex; 51 } 52 53 int strLastIndex = targetOffset + targetCount - 1; 54 char strLastChar = target[strLastIndex]; 55 int min = sourceOffset + targetCount - 1; 56 int i = min + fromIndex; 57 58 startSearchForLastChar: while (true) { 59 while (i >= min && source[i] != strLastChar) { 60 i--; 61 } 62 if (i < min) { 63 return -1; 64 } 65 int j = i - 1; 66 int start = j - (targetCount - 1); 67 int k = strLastIndex - 1; 68 69 while (j > start) { 70 if (source[j--] != target[k--]) { 71 i--; 72 continue startSearchForLastChar; 73 } 74 } 75 return start - sourceOffset + 1; 76 } 77 } 78 79 @Test 80 public void run0() throws Throwable { 81 runTest("test", v1, 0, v1.length, v2, 0, v2.length, 10); 82 } 83 84 @Test 85 public void run1() throws Throwable { 86 runTest("test", v1, 0, v1.length, v3, 0, v3.length, 10); 87 } 88 89 @Test 90 public void run2() throws Throwable { 91 runTest("test", v1, 0, v1.length, v4, 0, v4.length, 10); 92 } 93 94 @Test 95 public void run3() throws Throwable { 96 runTest("test", v1, 1, v1.length - 1, v3, 0, v3.length, 10); 97 } 98 99 @Test 100 // (expected = ArrayIndexOutOfBoundsException.class) 101 public void run4() throws Throwable { 102 runTest("test", v1, 1, v1.length, v3, 0, v3.length, 10); 103 } 104 }