| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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| */ |
| |
| /* |
| * @test |
| * @bug 8054307 |
| * @summary Validates StringCoding.hasNegatives intrinsic with a small range of tests. |
| * @library /compiler/patches |
| * @build java.base/java.lang.Helper |
| * @build compiler.intrinsics.string.TestHasNegatives |
| * @run main compiler.intrinsics.string.TestHasNegatives |
| */ |
| package compiler.intrinsics.string; |
| |
| import java.lang.Helper; |
| |
| /* |
| * @summary Validates StringCoding.hasNegatives intrinsic with a small |
| * range of tests. |
| */ |
| public class TestHasNegatives { |
| |
| private static byte[] tBa = new byte[4096 + 16]; |
| |
| /** |
| * Completely initialize the test array, preparing it for tests of the |
| * StringCoding.hasNegatives method with a given array segment offset, |
| * length, and number of negative bytes. |
| */ |
| public static void initialize(int off, int len, int neg) { |
| assert (len + off <= tBa.length); |
| // insert "canary" (negative) values before offset |
| for (int i = 0; i < off; ++i) { |
| tBa[i] = (byte) (((i + 15) & 0x7F) | 0x80); |
| } |
| // fill the array segment |
| for (int i = off; i < len + off; ++i) { |
| tBa[i] = (byte) (((i - off + 15) & 0x7F)); |
| } |
| if (neg != 0) { |
| // modify a number (neg) disparate array bytes inside |
| // segment to be negative. |
| int div = (neg > 1) ? (len - 1) / (neg - 1) : 0; |
| int idx; |
| for (int i = 0; i < neg; ++i) { |
| idx = off + (len - 1) - div * i; |
| tBa[idx] = (byte) (0x80 | tBa[idx]); |
| } |
| } |
| // insert "canary" negative values after array segment |
| for (int i = len + off; i < tBa.length; ++i) { |
| tBa[i] = (byte) (((i + 15) & 0x7F) | 0x80); |
| } |
| } |
| |
| /** Sizes of array segments to test. */ |
| private static int sizes[] = { 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 17, 19, 23, 37, 61, 131, |
| 4099 }; |
| |
| /** |
| * Test different array segment sizes, offsets, and number of negative |
| * bytes. |
| */ |
| public static void test_hasNegatives() throws Exception { |
| int len, off; |
| int ng; |
| boolean r; |
| |
| for (ng = 0; ng < 57; ++ng) { // number of negatives in array segment |
| for (off = 0; off < 8; ++off) { // starting offset of array segment |
| for (int i = 0; i < sizes.length; ++i) { // array segment size |
| // choice |
| len = sizes[i]; |
| if (len + off > tBa.length) |
| continue; |
| initialize(off, len, ng); |
| r = Helper.StringCodingHasNegatives(tBa, off, len); |
| if (r ^ ((ng == 0) ? false : true)) { |
| throw new Exception("Failed test hasNegatives " + "offset: " + off + " " |
| + "length: " + len + " " + "return: " + r + " " + "negatives: " |
| + ng); |
| } |
| } |
| } |
| } |
| } |
| |
| public void run() throws Exception { |
| // iterate to eventually get intrinsic inlined |
| for (int j = 0; j < 1000; ++j) { |
| test_hasNegatives(); |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| (new TestHasNegatives()).run(); |
| System.out.println("hasNegatives validated"); |
| } |
| } |