--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/compiler/stable/TestStableObject.java Tue Mar 04 02:20:41 2014 -0800
@@ -0,0 +1,635 @@
+/*
+ * Copyright (c) 2014, 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. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 TestStableObject
+ * @summary tests on stable fields and arrays
+ * @library /testlibrary
+ * @compile -XDignore.symbol.file TestStableObject.java
+ * @run main ClassFileInstaller
+ * java/lang/invoke/TestStableObject
+ * java/lang/invoke/TestStableObject$ObjectStable
+ * java/lang/invoke/TestStableObject$StaticObjectStable
+ * java/lang/invoke/TestStableObject$VolatileObjectStable
+ * java/lang/invoke/TestStableObject$ObjectArrayDim1
+ * java/lang/invoke/TestStableObject$ObjectArrayDim2
+ * java/lang/invoke/TestStableObject$ObjectArrayDim3
+ * java/lang/invoke/TestStableObject$ObjectArrayDim4
+ * java/lang/invoke/TestStableObject$ObjectArrayLowerDim0
+ * java/lang/invoke/TestStableObject$ObjectArrayLowerDim1
+ * java/lang/invoke/TestStableObject$NestedStableField
+ * java/lang/invoke/TestStableObject$NestedStableField$A
+ * java/lang/invoke/TestStableObject$NestedStableField1
+ * java/lang/invoke/TestStableObject$NestedStableField1$A
+ * java/lang/invoke/TestStableObject$NestedStableField2
+ * java/lang/invoke/TestStableObject$NestedStableField2$A
+ * java/lang/invoke/TestStableObject$NestedStableField3
+ * java/lang/invoke/TestStableObject$NestedStableField3$A
+ * java/lang/invoke/TestStableObject$Values
+ * java/lang/invoke/TestStableObject$DefaultValue
+ * java/lang/invoke/TestStableObject$ObjectArrayLowerDim2
+ *
+ * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions
+ * -XX:+UnlockDiagnosticVMOptions -XX:+FoldStableValues -XX:+UseCompressedOop
+ * -server -XX:-TieredCompilation -Xcomp
+ * -XX:CompileOnly=::get,::get1,::get2,::get3,::get4
+ * java.lang.invoke.TestStableObject
+ *
+ * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions
+ * -XX:+UnlockDiagnosticVMOptions -XX:+FoldStableValues -XX:-UseCompressedOop
+ * -server -XX:-TieredCompilation -Xcomp
+ * -XX:CompileOnly=::get,::get1,::get2,::get3,::get4
+ * java.lang.invoke.TestStableObject
+ *
+ * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions
+ * -XX:+UnlockDiagnosticVMOptions -XX:-FoldStableValues -XX:+UseCompressedOop
+ * -server -XX:-TieredCompilation -Xcomp
+ * -XX:CompileOnly=::get,::get1,::get2,::get3,::get4
+ * java.lang.invoke.TestStableObject
+ *
+ * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions
+ * -XX:+UnlockDiagnosticVMOptions -XX:-FoldStableValues -XX:-UseCompressedOop
+ * -server -XX:-TieredCompilation -Xcomp
+ * -XX:CompileOnly=::get,::get1,::get2,::get3,::get4
+ * java.lang.invoke.TestStableObject
+ */
+package java.lang.invoke;
+
+import com.sun.management.HotSpotDiagnosticMXBean;
+import com.sun.management.VMOption;
+import sun.management.ManagementFactoryHelper;
+import java.lang.reflect.InvocationTargetException;
+
+public class TestStableObject {
+ public static void main(String[] args) throws Exception {
+ System.out.println("@Stable enabled: "+isStableEnabled);
+ System.out.println();
+
+ run(DefaultValue.class);
+ run(ObjectStable.class);
+ run(StaticObjectStable.class);
+ run(VolatileObjectStable.class);
+
+ // @Stable arrays: Dim 1-4
+ run(ObjectArrayDim1.class);
+ run(ObjectArrayDim2.class);
+ run(ObjectArrayDim3.class);
+ run(ObjectArrayDim4.class);
+
+ // @Stable Object field: dynamic arrays
+ run(ObjectArrayLowerDim0.class);
+ run(ObjectArrayLowerDim1.class);
+ run(ObjectArrayLowerDim2.class);
+
+ // Nested @Stable fields
+ run(NestedStableField.class);
+ run(NestedStableField1.class);
+ run(NestedStableField2.class);
+ run(NestedStableField3.class);
+
+ if (failed) {
+ throw new Error("TEST FAILED");
+ }
+ }
+
+ /* ==================================================== */
+
+ enum Values {A, B, C, D, E, F}
+
+ static class DefaultValue {
+ public @Stable Object v;
+
+ public static final DefaultValue c = new DefaultValue();
+ public static Object get() { return c.v; }
+ public static void test() throws Exception {
+ Object val1 = get();
+ c.v = Values.A; Object val2 = get();
+ assertEquals(val1, null);
+ assertEquals(val2, Values.A);
+ }
+ }
+
+ /* ==================================================== */
+
+ static class ObjectStable {
+ public @Stable Values v;
+
+ public static final ObjectStable c = new ObjectStable ();
+ public static Values get() { return c.v; }
+ public static void test() throws Exception {
+ c.v = Values.A; Values val1 = get();
+ c.v = Values.B; Values val2 = get();
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+ }
+ }
+
+ /* ==================================================== */
+
+ static class StaticObjectStable {
+ public static @Stable Values v;
+
+ public static final ObjectStable c = new ObjectStable ();
+ public static Values get() { return c.v; }
+ public static void test() throws Exception {
+ c.v = Values.A; Values val1 = get();
+ c.v = Values.B; Values val2 = get();
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+ }
+ }
+
+ /* ==================================================== */
+
+ static class VolatileObjectStable {
+ public @Stable volatile Values v;
+
+ public static final VolatileObjectStable c = new VolatileObjectStable ();
+ public static Values get() { return c.v; }
+ public static void test() throws Exception {
+ c.v = Values.A; Values val1 = get();
+ c.v = Values.B; Values val2 = get();
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+ }
+ }
+
+ /* ==================================================== */
+ // @Stable array == field && all components are stable
+
+ static class ObjectArrayDim1 {
+ public @Stable Object[] v;
+
+ public static final ObjectArrayDim1 c = new ObjectArrayDim1();
+ public static Object get() { return c.v[0]; }
+ public static Object get1() { return c.v[10]; }
+ public static Object[] get2() { return c.v; }
+ public static void test() throws Exception {
+ {
+ c.v = new Object[1]; c.v[0] = Values.A; Object val1 = get();
+ c.v[0] = Values.B; Object val2 = get();
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+
+ c.v = new Object[1]; c.v[0] = Values.C; Object val3 = get();
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.C));
+ }
+
+ {
+ c.v = new Object[20]; c.v[10] = Values.A; Object val1 = get1();
+ c.v[10] = Values.B; Object val2 = get1();
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+
+ c.v = new Object[20]; c.v[10] = Values.C; Object val3 = get1();
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.C));
+ }
+
+ {
+ c.v = new Object[1]; Object[] val1 = get2();
+ c.v = new Object[1]; Object[] val2 = get2();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+ }
+ }
+
+ /* ==================================================== */
+
+ static class ObjectArrayDim2 {
+ public @Stable Object[][] v;
+
+ public static final ObjectArrayDim2 c = new ObjectArrayDim2();
+ public static Object get() { return c.v[0][0]; }
+ public static Object[] get1() { return c.v[0]; }
+ public static Object[][] get2() { return c.v; }
+ public static void test() throws Exception {
+ {
+ c.v = new Object[1][1]; c.v[0][0] = Values.A; Object val1 = get();
+ c.v[0][0] = Values.B; Object val2 = get();
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+
+ c.v = new Object[1][1]; c.v[0][0] = Values.C; Object val3 = get();
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.C));
+
+ c.v[0] = new Object[1]; c.v[0][0] = Values.D; Object val4 = get();
+ assertEquals(val4, (isStableEnabled ? Values.A : Values.D));
+ }
+
+ {
+ c.v = new Object[1][1]; Object[] val1 = get1();
+ c.v[0] = new Object[1]; Object[] val2 = get1();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[1][1]; Object[][] val1 = get2();
+ c.v = new Object[1][1]; Object[][] val2 = get2();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+ }
+ }
+
+ /* ==================================================== */
+
+ static class ObjectArrayDim3 {
+ public @Stable Object[][][] v;
+
+ public static final ObjectArrayDim3 c = new ObjectArrayDim3();
+ public static Object get() { return c.v[0][0][0]; }
+ public static Object[] get1() { return c.v[0][0]; }
+ public static Object[][] get2() { return c.v[0]; }
+ public static Object[][][] get3() { return c.v; }
+ public static void test() throws Exception {
+ {
+ c.v = new Object[1][1][1]; c.v[0][0][0] = Values.A; Object val1 = get();
+ c.v[0][0][0] = Values.B; Object val2 = get();
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+
+ c.v = new Object[1][1][1]; c.v[0][0][0] = Values.C; Object val3 = get();
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.C));
+
+ c.v[0] = new Object[1][1]; c.v[0][0][0] = Values.D; Object val4 = get();
+ assertEquals(val4, (isStableEnabled ? Values.A : Values.D));
+
+ c.v[0][0] = new Object[1]; c.v[0][0][0] = Values.E; Object val5 = get();
+ assertEquals(val5, (isStableEnabled ? Values.A : Values.E));
+ }
+
+ {
+ c.v = new Object[1][1][1]; Object[] val1 = get1();
+ c.v[0][0] = new Object[1]; Object[] val2 = get1();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[1][1][1]; Object[][] val1 = get2();
+ c.v[0] = new Object[1][1]; Object[][] val2 = get2();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[1][1][1]; Object[][][] val1 = get3();
+ c.v = new Object[1][1][1]; Object[][][] val2 = get3();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+ }
+ }
+
+ /* ==================================================== */
+
+ static class ObjectArrayDim4 {
+ public @Stable Object[][][][] v;
+
+ public static final ObjectArrayDim4 c = new ObjectArrayDim4();
+ public static Object get() { return c.v[0][0][0][0]; }
+ public static Object[] get1() { return c.v[0][0][0]; }
+ public static Object[][] get2() { return c.v[0][0]; }
+ public static Object[][][] get3() { return c.v[0]; }
+ public static Object[][][][] get4() { return c.v; }
+ public static void test() throws Exception {
+ {
+ c.v = new Object[1][1][1][1]; c.v[0][0][0][0] = Values.A; Object val1 = get();
+ c.v[0][0][0][0] = Values.B; Object val2 = get();
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+
+ c.v = new Object[1][1][1][1]; c.v[0][0][0][0] = Values.C; Object val3 = get();
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.C));
+
+ c.v[0] = new Object[1][1][1]; c.v[0][0][0][0] = Values.D; Object val4 = get();
+ assertEquals(val4, (isStableEnabled ? Values.A : Values.D));
+
+ c.v[0][0] = new Object[1][1]; c.v[0][0][0][0] = Values.E; Object val5 = get();
+ assertEquals(val5, (isStableEnabled ? Values.A : Values.E));
+
+ c.v[0][0][0] = new Object[1]; c.v[0][0][0][0] = Values.F; Object val6 = get();
+ assertEquals(val6, (isStableEnabled ? Values.A : Values.F));
+ }
+
+ {
+ c.v = new Object[1][1][1][1]; Object[] val1 = get1();
+ c.v[0][0][0] = new Object[1]; Object[] val2 = get1();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[1][1][1][1]; Object[][] val1 = get2();
+ c.v[0][0] = new Object[1][1]; Object[][] val2 = get2();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[1][1][1][1]; Object[][][] val1 = get3();
+ c.v[0] = new Object[1][1][1]; Object[][][] val2 = get3();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[1][1][1][1]; Object[][][][] val1 = get4();
+ c.v = new Object[1][1][1][1]; Object[][][][] val2 = get4();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ }
+ }
+
+ /* ==================================================== */
+ // Dynamic Dim is higher than static
+
+ static class ObjectArrayLowerDim0 {
+ public @Stable Object v;
+
+ public static final ObjectArrayLowerDim0 c = new ObjectArrayLowerDim0();
+ public static Object get() { return ((Object[])c.v)[0]; }
+ public static Object[] get1() { return (Object[])c.v; }
+
+ public static void test() throws Exception {
+ {
+ c.v = new Object[1]; ((Object[])c.v)[0] = Values.A; Object val1 = get();
+ ((Object[])c.v)[0] = Values.B; Object val2 = get();
+
+ assertEquals(val1, Values.A);
+ assertEquals(val2, Values.B);
+ }
+
+ {
+ c.v = new Object[1]; Object[] val1 = get1();
+ c.v = new Object[1]; Object[] val2 = get1();
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+ }
+ }
+
+ /* ==================================================== */
+
+ static class ObjectArrayLowerDim1 {
+ public @Stable Object[] v;
+
+ public static final ObjectArrayLowerDim1 c = new ObjectArrayLowerDim1();
+ public static Object get() { return ((Object[][])c.v)[0][0]; }
+ public static Object[] get1() { return (Object[])(c.v[0]); }
+ public static Object[] get2() { return c.v; }
+
+ public static void test() throws Exception {
+ {
+ c.v = new Object[1][1]; ((Object[][])c.v)[0][0] = Values.A; Object val1 = get();
+ ((Object[][])c.v)[0][0] = Values.B; Object val2 = get();
+
+ assertEquals(val1, Values.A);
+ assertEquals(val2, Values.B);
+ }
+
+ {
+ c.v = new Object[1][1]; c.v[0] = new Object[0]; Object[] val1 = get1();
+ c.v[0] = new Object[0]; Object[] val2 = get1();
+
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[0][0]; Object[] val1 = get2();
+ c.v = new Object[0][0]; Object[] val2 = get2();
+
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+ }
+ }
+
+ /* ==================================================== */
+
+ static class ObjectArrayLowerDim2 {
+ public @Stable Object[][] v;
+
+ public static final ObjectArrayLowerDim2 c = new ObjectArrayLowerDim2();
+ public static Object get() { return ((Object[][][])c.v)[0][0][0]; }
+ public static Object[] get1() { return (Object[])(c.v[0][0]); }
+ public static Object[][] get2() { return (Object[][])(c.v[0]); }
+ public static Object[][] get3() { return c.v; }
+
+ public static void test() throws Exception {
+ {
+ c.v = new Object[1][1][1]; ((Object[][][])c.v)[0][0][0] = Values.A; Object val1 = get();
+ ((Object[][][])c.v)[0][0][0] = Values.B; Object val2 = get();
+
+ assertEquals(val1, Values.A);
+ assertEquals(val2, Values.B);
+ }
+
+ {
+ c.v = new Object[1][1][1]; c.v[0][0] = new Object[0]; Object[] val1 = get1();
+ c.v[0][0] = new Object[0]; Object[] val2 = get1();
+
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[1][1][1]; c.v[0] = new Object[0][0]; Object[][] val1 = get2();
+ c.v[0] = new Object[0][0]; Object[][] val2 = get2();
+
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+
+ {
+ c.v = new Object[0][0][0]; Object[][] val1 = get3();
+ c.v = new Object[0][0][0]; Object[][] val2 = get3();
+
+ assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
+ }
+ }
+ }
+
+ /* ==================================================== */
+
+ static class NestedStableField {
+ static class A {
+ public @Stable Object a;
+
+ }
+ public @Stable A v;
+
+ public static final NestedStableField c = new NestedStableField();
+ public static A get() { return c.v; }
+ public static Object get1() { return get().a; }
+
+ public static void test() throws Exception {
+ {
+ c.v = new A(); c.v.a = Values.A; A val1 = get();
+ c.v.a = Values.B; A val2 = get();
+
+ assertEquals(val1.a, Values.B);
+ assertEquals(val2.a, Values.B);
+ }
+
+ {
+ c.v = new A(); c.v.a = Values.A; Object val1 = get1();
+ c.v.a = Values.B; Object val2 = get1();
+ c.v = new A(); c.v.a = Values.C; Object val3 = get1();
+
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.C));
+ }
+ }
+ }
+
+ /* ==================================================== */
+
+ static class NestedStableField1 {
+ static class A {
+ public @Stable Object a;
+ public @Stable A next;
+ }
+ public @Stable A v;
+
+ public static final NestedStableField1 c = new NestedStableField1();
+ public static A get() { return c.v.next.next.next.next.next.next.next; }
+ public static Object get1() { return get().a; }
+
+ public static void test() throws Exception {
+ {
+ c.v = new A(); c.v.next = new A(); c.v.next.next = c.v;
+ c.v.a = Values.A; c.v.next.a = Values.A; A val1 = get();
+ c.v.a = Values.B; c.v.next.a = Values.B; A val2 = get();
+
+ assertEquals(val1.a, Values.B);
+ assertEquals(val2.a, Values.B);
+ }
+
+ {
+ c.v = new A(); c.v.next = c.v;
+ c.v.a = Values.A; Object val1 = get1();
+ c.v.a = Values.B; Object val2 = get1();
+ c.v = new A(); c.v.next = c.v;
+ c.v.a = Values.C; Object val3 = get1();
+
+ assertEquals(val1, Values.A);
+ assertEquals(val2, (isStableEnabled ? Values.A : Values.B));
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.C));
+ }
+ }
+ }
+ /* ==================================================== */
+
+ static class NestedStableField2 {
+ static class A {
+ public @Stable Object a;
+ public @Stable A left;
+ public A right;
+ }
+
+ public @Stable A v;
+
+ public static final NestedStableField2 c = new NestedStableField2();
+ public static Object get() { return c.v.left.left.left.a; }
+ public static Object get1() { return c.v.left.left.right.left.a; }
+
+ public static void test() throws Exception {
+ {
+ c.v = new A(); c.v.left = c.v.right = c.v;
+ c.v.a = Values.A; Object val1 = get(); Object val2 = get1();
+ c.v.a = Values.B; Object val3 = get(); Object val4 = get1();
+
+ assertEquals(val1, Values.A);
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.B));
+
+ assertEquals(val2, Values.A);
+ assertEquals(val4, Values.B);
+ }
+ }
+ }
+
+ /* ==================================================== */
+
+ static class NestedStableField3 {
+ static class A {
+ public @Stable Object a;
+ public @Stable A[] left;
+ public A[] right;
+ }
+
+ public @Stable A[] v;
+
+ public static final NestedStableField3 c = new NestedStableField3();
+ public static Object get() { return c.v[0].left[1].left[0].left[1].a; }
+ public static Object get1() { return c.v[1].left[0].left[1].right[0].left[1].a; }
+
+ public static void test() throws Exception {
+ {
+ A elem = new A();
+ c.v = new A[] { elem, elem }; c.v[0].left = c.v[0].right = c.v;
+ elem.a = Values.A; Object val1 = get(); Object val2 = get1();
+ elem.a = Values.B; Object val3 = get(); Object val4 = get1();
+
+ assertEquals(val1, Values.A);
+ assertEquals(val3, (isStableEnabled ? Values.A : Values.B));
+
+ assertEquals(val2, Values.A);
+ assertEquals(val4, Values.B);
+ }
+ }
+ }
+
+ /* ==================================================== */
+ // Auxiliary methods
+ static void assertEquals(Object i, Object j) { if (i != j) throw new AssertionError(i + " != " + j); }
+ static void assertTrue(boolean b) { if (!b) throw new AssertionError(); }
+
+ static boolean failed = false;
+
+ public static void run(Class<?> test) {
+ Throwable ex = null;
+ System.out.print(test.getName()+": ");
+ try {
+ test.getMethod("test").invoke(null);
+ } catch (InvocationTargetException e) {
+ ex = e.getCause();
+ } catch (Throwable e) {
+ ex = e;
+ } finally {
+ if (ex == null) {
+ System.out.println("PASSED");
+ } else {
+ failed = true;
+ System.out.println("FAILED");
+ ex.printStackTrace(System.out);
+ }
+ }
+ }
+
+ static final boolean isStableEnabled;
+ static {
+ HotSpotDiagnosticMXBean diagnostic
+ = ManagementFactoryHelper.getDiagnosticMXBean();
+ VMOption tmp;
+ try {
+ tmp = diagnostic.getVMOption("FoldStableValues");
+ } catch (IllegalArgumentException e) {
+ tmp = null;
+ }
+ isStableEnabled = (tmp == null ? false : Boolean.parseBoolean(tmp.getValue()));
+ }
+}