| /* |
| * 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]; |
| } |
| } |