| /* |
| * Copyright (c) 2015, 2017, 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 8143628 |
| * @summary Test unsafe access for char |
| * |
| * @modules jdk.unsupported/sun.misc |
| * @run testng/othervm -Diters=100 -Xint compiler.unsafe.SunMiscUnsafeAccessTestChar |
| * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.SunMiscUnsafeAccessTestChar |
| * @run testng/othervm -Diters=20000 -XX:-TieredCompilation compiler.unsafe.SunMiscUnsafeAccessTestChar |
| * @run testng/othervm -Diters=20000 compiler.unsafe.SunMiscUnsafeAccessTestChar |
| */ |
| |
| package compiler.unsafe; |
| |
| import org.testng.annotations.Test; |
| |
| import java.lang.reflect.Field; |
| |
| import static org.testng.Assert.*; |
| |
| public class SunMiscUnsafeAccessTestChar { |
| static final int ITERS = Integer.getInteger("iters", 1); |
| static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10); |
| |
| static final sun.misc.Unsafe UNSAFE; |
| |
| static final long V_OFFSET; |
| |
| static final Object STATIC_V_BASE; |
| |
| static final long STATIC_V_OFFSET; |
| |
| static int ARRAY_OFFSET; |
| |
| static int ARRAY_SHIFT; |
| |
| static { |
| try { |
| Field f = sun.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
| f.setAccessible(true); |
| UNSAFE = (sun.misc.Unsafe) f.get(null); |
| } catch (Exception e) { |
| throw new RuntimeException("Unable to get Unsafe instance.", e); |
| } |
| |
| try { |
| Field staticVField = SunMiscUnsafeAccessTestChar.class.getDeclaredField("static_v"); |
| STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField); |
| STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| |
| try { |
| Field vField = SunMiscUnsafeAccessTestChar.class.getDeclaredField("v"); |
| V_OFFSET = UNSAFE.objectFieldOffset(vField); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| |
| ARRAY_OFFSET = UNSAFE.arrayBaseOffset(char[].class); |
| int ascale = UNSAFE.arrayIndexScale(char[].class); |
| ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale); |
| } |
| |
| static char static_v; |
| |
| char v; |
| |
| @Test |
| public void testFieldInstance() { |
| SunMiscUnsafeAccessTestChar t = new SunMiscUnsafeAccessTestChar(); |
| for (int c = 0; c < ITERS; c++) { |
| testAccess(t, V_OFFSET); |
| } |
| } |
| |
| @Test |
| public void testFieldStatic() { |
| for (int c = 0; c < ITERS; c++) { |
| testAccess(STATIC_V_BASE, STATIC_V_OFFSET); |
| } |
| } |
| |
| @Test |
| public void testArray() { |
| char[] array = new char[10]; |
| for (int c = 0; c < ITERS; c++) { |
| for (int i = 0; i < array.length; i++) { |
| testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET); |
| } |
| } |
| } |
| |
| @Test |
| public void testArrayOffHeap() { |
| int size = 10; |
| long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT); |
| try { |
| for (int c = 0; c < ITERS; c++) { |
| for (int i = 0; i < size; i++) { |
| testAccess(null, (((long) i) << ARRAY_SHIFT) + address); |
| } |
| } |
| } finally { |
| UNSAFE.freeMemory(address); |
| } |
| } |
| |
| @Test |
| public void testArrayOffHeapDirect() { |
| int size = 10; |
| long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT); |
| try { |
| for (int c = 0; c < ITERS; c++) { |
| for (int i = 0; i < size; i++) { |
| testAccess((((long) i) << ARRAY_SHIFT) + address); |
| } |
| } |
| } finally { |
| UNSAFE.freeMemory(address); |
| } |
| } |
| |
| static void testAccess(Object base, long offset) { |
| // Plain |
| { |
| UNSAFE.putChar(base, offset, '\u0123'); |
| char x = UNSAFE.getChar(base, offset); |
| assertEquals(x, '\u0123', "set char value"); |
| } |
| |
| // Volatile |
| { |
| UNSAFE.putCharVolatile(base, offset, '\u4567'); |
| char x = UNSAFE.getCharVolatile(base, offset); |
| assertEquals(x, '\u4567', "putVolatile char value"); |
| } |
| |
| |
| |
| |
| |
| } |
| |
| static void testAccess(long address) { |
| // Plain |
| { |
| UNSAFE.putChar(address, '\u0123'); |
| char x = UNSAFE.getChar(address); |
| assertEquals(x, '\u0123', "set char value"); |
| } |
| } |
| } |