1 /* 2 * Copyright (c) 2016, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* 27 * @test 28 * @bug 8054307 29 * @summary Validates StringCoding.hasNegatives intrinsic with a small range of tests. 30 * @run main/bootclasspath java.lang.TestHasNegatives 31 */ 32 package java.lang; 33 34 import java.lang.StringCoding; 35 36 /* 37 * @summary Validates StringCoding.hasNegatives intrinsic with a small 38 * range of tests. Must be run with modified bootclasspath 39 * to allow existence in java.lang package. 40 */ 41 public class TestHasNegatives { 42 43 private static byte[] tBa = new byte[4096 + 16]; 44 45 /** 46 * Completely initialize the test array, preparing it for tests of the 47 * StringCoding.hasNegatives method with a given array segment offset, 48 * length, and number of negative bytes. 49 */ 50 public static void initialize(int off, int len, int neg) { 51 assert (len + off <= tBa.length); 52 // insert "canary" (negative) values before offset 53 for (int i = 0; i < off; ++i) { 54 tBa[i] = (byte) (((i + 15) & 0x7F) | 0x80); 55 } 56 // fill the array segment 57 for (int i = off; i < len + off; ++i) { 58 tBa[i] = (byte) (((i - off + 15) & 0x7F)); 59 } 60 if (neg != 0) { 61 // modify a number (neg) disparate array bytes inside 62 // segment to be negative. 63 int div = (neg > 1) ? (len - 1) / (neg - 1) : 0; 64 int idx; 65 for (int i = 0; i < neg; ++i) { 66 idx = off + (len - 1) - div * i; 67 tBa[idx] = (byte) (0x80 | tBa[idx]); 68 } 69 } 70 // insert "canary" negative values after array segment 71 for (int i = len + off; i < tBa.length; ++i) { 72 tBa[i] = (byte) (((i + 15) & 0x7F) | 0x80); 73 } 74 } 75 76 /** Sizes of array segments to test. */ 77 private static int sizes[] = { 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 17, 19, 23, 37, 61, 131, 78 4099 }; 79 80 /** 81 * Test different array segment sizes, offsets, and number of negative 82 * bytes. 83 */ 84 public static void test_hasNegatives() throws Exception { 85 int len, off; 86 int ng; 87 boolean r; 88 89 for (ng = 0; ng < 57; ++ng) { // number of negatives in array segment 90 for (off = 0; off < 8; ++off) { // starting offset of array segment 91 for (int i = 0; i < sizes.length; ++i) { // array segment size 92 // choice 93 len = sizes[i]; 94 if (len + off > tBa.length) 95 continue; 96 initialize(off, len, ng); 97 r = StringCoding.hasNegatives(tBa, off, len); 98 if (r ^ ((ng == 0) ? false : true)) { 99 throw new Exception("Failed test hasNegatives " + "offset: " + off + " " 100 + "length: " + len + " " + "return: " + r + " " + "negatives: " 101 + ng); 102 } 103 } 104 } 105 } 106 } 107 108 public void run() throws Exception { 109 // iterate to eventually get intrinsic inlined 110 for (int j = 0; j < 1000; ++j) { 111 test_hasNegatives(); 112 } 113 } 114 115 public static void main(String[] args) throws Exception { 116 (new TestHasNegatives()).run(); 117 System.out.println("hasNegatives validated"); 118 } 119 }