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 * @library /compiler/patches 31 * 32 * @build java.base/java.lang.Helper 33 * @run main compiler.intrinsics.string.TestHasNegatives 34 */ 35 36 package compiler.intrinsics.string; 37 38 /* 39 * @summary Validates StringCoding.hasNegatives intrinsic with a small 40 * range of tests. 41 */ 42 public class TestHasNegatives { 43 44 private static byte[] tBa = new byte[4096 + 16]; 45 46 /** 47 * Completely initialize the test array, preparing it for tests of the 48 * StringCoding.hasNegatives method with a given array segment offset, 49 * length, and number of negative bytes. 50 */ 51 public static void initialize(int off, int len, int neg) { 52 assert (len + off <= tBa.length); 53 // insert "canary" (negative) values before offset 54 for (int i = 0; i < off; ++i) { 55 tBa[i] = (byte) (((i + 15) & 0x7F) | 0x80); 56 } 57 // fill the array segment 58 for (int i = off; i < len + off; ++i) { 59 tBa[i] = (byte) (((i - off + 15) & 0x7F)); 60 } 61 if (neg != 0) { 62 // modify a number (neg) disparate array bytes inside 63 // segment to be negative. 64 int div = (neg > 1) ? (len - 1) / (neg - 1) : 0; 65 int idx; 66 for (int i = 0; i < neg; ++i) { 67 idx = off + (len - 1) - div * i; 68 tBa[idx] = (byte) (0x80 | tBa[idx]); 69 } 70 } 71 // insert "canary" negative values after array segment 72 for (int i = len + off; i < tBa.length; ++i) { 73 tBa[i] = (byte) (((i + 15) & 0x7F) | 0x80); 74 } 75 } 76 77 /** Sizes of array segments to test. */ 78 private static int sizes[] = { 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 17, 19, 23, 37, 61, 131, 79 4099 }; 80 81 /** 82 * Test different array segment sizes, offsets, and number of negative 83 * bytes. 84 */ 85 public static void test_hasNegatives() throws Exception { 86 int len, off; 87 int ng; 88 boolean r; 89 90 for (ng = 0; ng < 57; ++ng) { // number of negatives in array segment 91 for (off = 0; off < 8; ++off) { // starting offset of array segment 92 for (int i = 0; i < sizes.length; ++i) { // array segment size 93 // choice 94 len = sizes[i]; 95 if (len + off > tBa.length) 96 continue; 97 initialize(off, len, ng); 98 r = Helper.StringCodingHasNegatives(tBa, off, len); 99 if (r ^ ((ng == 0) ? false : true)) { 100 throw new Exception("Failed test hasNegatives " + "offset: " + off + " " 101 + "length: " + len + " " + "return: " + r + " " + "negatives: " 102 + ng); 103 } 104 } 105 } 106 } 107 } 108 109 public void run() throws Exception { 110 // iterate to eventually get intrinsic inlined 111 for (int j = 0; j < 1000; ++j) { 112 test_hasNegatives(); 113 } 114 } 115 116 public static void main(String[] args) throws Exception { 117 (new TestHasNegatives()).run(); 118 System.out.println("hasNegatives validated"); 119 } 120 }