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/*
* Copyright (c) 2016, 2018, 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.
*
* 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8054307
* @summary Validates StringCoding.hasNegatives intrinsic with a small range of tests.
* @library /compiler/patches
*
* @build java.base/java.lang.Helper
* @run main compiler.intrinsics.string.TestHasNegatives
*/
package compiler.intrinsics.string;
/*
* @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");
}
}
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