1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import jdk.test.lib.Asserts; 25 26 /* 27 * @test 28 * @bug 8144212 29 * @summary Check for correct memory flow with the String compress/inflate intrinsics. 30 * @modules java.base/jdk.internal.misc 31 * @library /testlibrary 32 * @run main TestStringIntrinsicMemoryFlow 33 */ 34 public class TestStringIntrinsicMemoryFlow { 35 36 public static void main(String[] args) { 37 for (int i = 0; i < 100_000; ++i) { 38 String s = "MyString"; 39 char[] c = {'M'}; 40 char res = testInflate1(s); 41 Asserts.assertEquals(res, 'M', "testInflate1 failed"); 42 res = testInflate2(s); 43 Asserts.assertEquals(res, (char)42, "testInflate2 failed"); 44 res = testCompress1(c); 45 Asserts.assertEquals(res, 'M', "testCompress1 failed"); 46 byte resB = testCompress2(c); 47 Asserts.assertEquals(resB, (byte)42, "testCompress2 failed"); 48 } 49 } 50 51 private static char testInflate1(String s) { 52 char c[] = new char[1]; 53 // Inflate String from byte[] to char[] 54 s.getChars(0, 1, c, 0); 55 // Read char[] memory written by inflate intrinsic 56 return c[0]; 57 } 58 59 private static char testInflate2(String s) { 60 char c1[] = new char[1]; 61 char c2[] = new char[1]; 62 c2[0] = 42; 63 // Inflate String from byte[] to char[] 64 s.getChars(0, 1, c1, 0); 65 // Read char[] memory written before inflation 66 return c2[0]; 67 } 68 69 private static char testCompress1(char[] c) { 70 // Compress String from char[] to byte[] 71 String s = new String(c); 72 // Read the memory written by compress intrinsic 73 return s.charAt(0); 74 } 75 76 private static byte testCompress2(char[] c) { 77 byte b1[] = new byte[1]; 78 b1[0] = 42; 79 // Compress String from char[] to byte[] 80 new String(c); 81 // Read byte[] memory written before compression 82 return b1[0]; 83 } 84 }