--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/unsafe/JdkInternalMiscUnsafeAccessTestChar.java Wed Dec 09 14:54:40 2015 +0100
@@ -0,0 +1,190 @@
+/*
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug 8143628
+ * @summary Test unsafe access for char
+ * @modules java.base/jdk.internal.misc
+ * @run testng/othervm -Diters=100 -Xint JdkInternalMiscUnsafeAccessTestChar
+ * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 JdkInternalMiscUnsafeAccessTestChar
+ * @run testng/othervm -Diters=20000 -XX:-TieredCompilation JdkInternalMiscUnsafeAccessTestChar
+ * @run testng/othervm -Diters=20000 JdkInternalMiscUnsafeAccessTestChar
+ */
+
+import org.testng.annotations.Test;
+
+import java.lang.reflect.Field;
+
+import static org.testng.Assert.*;
+
+public class JdkInternalMiscUnsafeAccessTestChar {
+ static final int ITERS = Integer.getInteger("iters", 1);
+
+ static final jdk.internal.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 = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
+ f.setAccessible(true);
+ UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
+ } catch (Exception e) {
+ throw new RuntimeException("Unable to get Unsafe instance.", e);
+ }
+
+ try {
+ Field staticVField = JdkInternalMiscUnsafeAccessTestChar.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 = JdkInternalMiscUnsafeAccessTestChar.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() {
+ JdkInternalMiscUnsafeAccessTestChar t = new JdkInternalMiscUnsafeAccessTestChar();
+ 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, 'a');
+ char x = UNSAFE.getChar(base, offset);
+ assertEquals(x, 'a', "set char value");
+ }
+
+ // Volatile
+ {
+ UNSAFE.putCharVolatile(base, offset, 'b');
+ char x = UNSAFE.getCharVolatile(base, offset);
+ assertEquals(x, 'b', "putVolatile char value");
+ }
+
+
+ // Unaligned
+ {
+ UNSAFE.putCharUnaligned(base, offset, 'b');
+ char x = UNSAFE.getCharUnaligned(base, offset);
+ assertEquals(x, 'b', "putUnaligned char value");
+ }
+
+ {
+ UNSAFE.putCharUnaligned(base, offset, 'a', true);
+ char x = UNSAFE.getCharUnaligned(base, offset, true);
+ assertEquals(x, 'a', "putUnaligned big endian char value");
+ }
+
+ {
+ UNSAFE.putCharUnaligned(base, offset, 'b', false);
+ char x = UNSAFE.getCharUnaligned(base, offset, false);
+ assertEquals(x, 'b', "putUnaligned little endian char value");
+ }
+
+
+ }
+
+ static void testAccess(long address) {
+ // Plain
+ {
+ UNSAFE.putChar(address, 'a');
+ char x = UNSAFE.getChar(address);
+ assertEquals(x, 'a', "set char value");
+ }
+ }
+}