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/*
* 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.
*
* 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 8144212
* @summary Check for correct memory flow with the String compress/inflate intrinsics.
* @modules java.base/jdk.internal.misc
* @library /test/lib
*
* @run main compiler.intrinsics.string.TestStringIntrinsicMemoryFlow
*/
package compiler.intrinsics.string;
import jdk.test.lib.Asserts;
public class TestStringIntrinsicMemoryFlow {
public static void main(String[] args) {
for (int i = 0; i < 100_000; ++i) {
String s = "MyString";
char[] c = {'M'};
char res = testInflate1(s);
Asserts.assertEquals(res, 'M', "testInflate1 failed");
res = testInflate2(s);
Asserts.assertEquals(res, (char)42, "testInflate2 failed");
res = testCompress1(c);
Asserts.assertEquals(res, 'M', "testCompress1 failed");
byte resB = testCompress2(c);
Asserts.assertEquals(resB, (byte)42, "testCompress2 failed");
}
}
private static char testInflate1(String s) {
char c[] = new char[1];
// Inflate String from byte[] to char[]
s.getChars(0, 1, c, 0);
// Read char[] memory written by inflate intrinsic
return c[0];
}
private static char testInflate2(String s) {
char c1[] = new char[1];
char c2[] = new char[1];
c2[0] = 42;
// Inflate String from byte[] to char[]
s.getChars(0, 1, c1, 0);
// Read char[] memory written before inflation
return c2[0];
}
private static char testCompress1(char[] c) {
// Compress String from char[] to byte[]
String s = new String(c);
// Read the memory written by compress intrinsic
return s.charAt(0);
}
private static byte testCompress2(char[] c) {
byte b1[] = new byte[1];
b1[0] = 42;
// Compress String from char[] to byte[]
new String(c);
// Read byte[] memory written before compression
return b1[0];
}
}
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