119 lines
4.3 KiB
Java
119 lines
4.3 KiB
Java
/*
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8054307
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* @summary Validates StringCoding.hasNegatives intrinsic with a small range of tests.
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* @library /compiler/patches
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*
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* @build java.base/java.lang.Helper
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* @run main compiler.intrinsics.string.TestHasNegatives
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*/
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package compiler.intrinsics.string;
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/*
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* @summary Validates StringCoding.hasNegatives intrinsic with a small
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* range of tests.
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*/
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public class TestHasNegatives {
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private static byte[] tBa = new byte[4096 + 16];
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/**
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* Completely initialize the test array, preparing it for tests of the
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* StringCoding.hasNegatives method with a given array segment offset,
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* length, and number of negative bytes.
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*/
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public static void initialize(int off, int len, int neg) {
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assert (len + off <= tBa.length);
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// insert "canary" (negative) values before offset
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for (int i = 0; i < off; ++i) {
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tBa[i] = (byte) (((i + 15) & 0x7F) | 0x80);
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}
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// fill the array segment
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for (int i = off; i < len + off; ++i) {
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tBa[i] = (byte) (((i - off + 15) & 0x7F));
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}
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if (neg != 0) {
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// modify a number (neg) disparate array bytes inside
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// segment to be negative.
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int div = (neg > 1) ? (len - 1) / (neg - 1) : 0;
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int idx;
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for (int i = 0; i < neg; ++i) {
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idx = off + (len - 1) - div * i;
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tBa[idx] = (byte) (0x80 | tBa[idx]);
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}
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}
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// insert "canary" negative values after array segment
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for (int i = len + off; i < tBa.length; ++i) {
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tBa[i] = (byte) (((i + 15) & 0x7F) | 0x80);
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}
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}
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/** Sizes of array segments to test. */
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private static int sizes[] = { 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 17, 19, 23, 37, 61, 131,
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4099 };
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/**
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* Test different array segment sizes, offsets, and number of negative
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* bytes.
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*/
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public static void test_hasNegatives() throws Exception {
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int len, off;
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int ng;
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boolean r;
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for (ng = 0; ng < 57; ++ng) { // number of negatives in array segment
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for (off = 0; off < 8; ++off) { // starting offset of array segment
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for (int i = 0; i < sizes.length; ++i) { // array segment size
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// choice
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len = sizes[i];
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if (len + off > tBa.length)
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continue;
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initialize(off, len, ng);
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r = Helper.StringCodingHasNegatives(tBa, off, len);
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if (r ^ ((ng == 0) ? false : true)) {
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throw new Exception("Failed test hasNegatives " + "offset: " + off + " "
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+ "length: " + len + " " + "return: " + r + " " + "negatives: "
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+ ng);
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}
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}
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}
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}
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}
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public void run() throws Exception {
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// iterate to eventually get intrinsic inlined
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for (int j = 0; j < 1000; ++j) {
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test_hasNegatives();
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}
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}
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public static void main(String[] args) throws Exception {
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(new TestHasNegatives()).run();
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System.out.println("hasNegatives validated");
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}
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}
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