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 * @library /testlibrary 31 * @run main TestStringIntrinsicMemoryFlow 32 */ 33 public class TestStringIntrinsicMemoryFlow { 34 35 public static void main(String[] args) { 36 for (int i = 0; i < 100_000; ++i) { 37 String s = "MyString"; 38 char[] c = {'M'}; 39 char res = testInflate1(s); 40 Asserts.assertEquals(res, 'M', "testInflate1 failed"); 41 res = testInflate2(s); 42 Asserts.assertEquals(res, (char)42, "testInflate2 failed"); 43 res = testCompress1(c); 44 Asserts.assertEquals(res, 'M', "testCompress1 failed"); 45 byte resB = testCompress2(c); 46 Asserts.assertEquals(resB, (byte)42, "testCompress2 failed"); 47 } 48 } 49 50 private static char testInflate1(String s) { 51 char c[] = new char[1]; 52 // Inflate String from byte[] to char[] 53 s.getChars(0, 1, c, 0); 54 // Read char[] memory written by inflate intrinsic 55 return c[0]; 56 } 57 58 private static char testInflate2(String s) { 59 char c1[] = new char[1]; 60 char c2[] = new char[1]; 61 c2[0] = 42; 62 // Inflate String from byte[] to char[] 63 s.getChars(0, 1, c1, 0); 64 // Read char[] memory written before inflation 65 return c2[0]; 66 } 67 68 private static char testCompress1(char[] c) { 69 // Compress String from char[] to byte[] 70 String s = new String(c); 71 // Read the memory written by compress intrinsic 72 return s.charAt(0); 73 } 74 75 private static byte testCompress2(char[] c) { 76 byte b1[] = new byte[1]; 77 b1[0] = 42; 78 // Compress String from char[] to byte[] 79 new String(c); 80 // Read byte[] memory written before compression 81 return b1[0]; 82 } 83 }