| /* |
| * Copyright (c) 2015, 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. |
| */ |
| |
| import java.io.*; |
| import java.lang.reflect.Field; |
| |
| import org.testng.annotations.BeforeClass; |
| import org.testng.annotations.DataProvider; |
| import org.testng.annotations.Test; |
| |
| import static org.testng.Assert.*; |
| |
| /* |
| * @test |
| * @bug 8077559 |
| * @summary Tests Compact String. This one is testing |
| * if Compact String enable/disable VM Options is indeed working in String class, |
| * it's verified by testing if the VM option affect coder and |
| * COMPACT_STRINGS field in String class. |
| * @modules java.base/java.lang:open |
| * @run testng/othervm -XX:+CompactStrings -DCompactStringEnabled=true VMOptionsTest |
| * @run testng/othervm -XX:-CompactStrings -DCompactStringEnabled=false VMOptionsTest |
| */ |
| |
| public class VMOptionsTest { |
| boolean compactStringEnabled; |
| // corresponding "COMPACT_STRINGS" field in String class. |
| Field COMPACT_STRINGS; |
| // corresponding "coder" field in String class. |
| Field coder; |
| |
| // corresponding coder type in String class. |
| final byte LATIN1 = 0; |
| final byte UTF16 = 1; |
| |
| @BeforeClass |
| public void setUp() throws Exception { |
| compactStringEnabled = Boolean.valueOf(System.getProperty("CompactStringEnabled", null)); |
| COMPACT_STRINGS = String.class.getDeclaredField("COMPACT_STRINGS"); |
| COMPACT_STRINGS.setAccessible(true); |
| coder = String.class.getDeclaredField("coder"); |
| coder.setAccessible(true); |
| } |
| |
| @DataProvider |
| public Object[][] provider() { |
| return new Object[][] { |
| new Object[] {"", LATIN1}, |
| new Object[] {"abc", LATIN1}, |
| new Object[] {"A\uff21", UTF16}, |
| new Object[] {"\uff21\uff22", UTF16} |
| }; |
| } |
| |
| /* |
| * verify the coder field in String objects. |
| */ |
| @Test(dataProvider = "provider") |
| public void testCoder(String str, byte expected) throws Exception { |
| byte c = (byte) coder.get(str); |
| expected = compactStringEnabled ? expected : UTF16; |
| assertEquals(c, expected); |
| } |
| |
| /* |
| * verify the COMPACT_STRINGS flag in String objects. |
| */ |
| @Test(dataProvider = "provider") |
| public void testCompactStringFlag(String str, byte ignore) throws Exception { |
| assertTrue(COMPACT_STRINGS.get(str).equals(compactStringEnabled)); |
| } |
| } |