/*
 * Copyright (c) 2013, 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 StableValueTest
 * @summary tests on stable fields and arrays
 * @library /testlibrary
 * @compile -XDignore.symbol.file StableValueTest.java
 * @run main ClassFileInstaller StableValueTest StableValueTest$BoolStable StableValueTest$ByteStable StableValueTest$CharStable
 *                              StableValueTest$DoubleStable StableValueTest$FloatStable StableValueTest$IntArrayArity1
 *                              StableValueTest$IntArrayArity2 StableValueTest$IntArrayArity3 StableValueTest$IntArrayArity4
 *                              StableValueTest$IntStable StableValueTest$LongStable StableValueTest$ObjectArrayArity0
 *                              StableValueTest$ObjectArrayArity1 StableValueTest$ObjectStable$Values StableValueTest$ObjectStable
 *                              StableValueTest$ShortStable StableValueTest$StaticBoolStable StableValueTest$StaticByteStable
 *                              StableValueTest$StaticCharStable StableValueTest$StaticDoubleStable StableValueTest$StaticFloatStable
 *                              StableValueTest$StaticIntStable StableValueTest$StaticLongStable StableValueTest$StaticShortStable
 *                              StableValueTest$VolatileBoolStable StableValueTest$VolatileByteStable StableValueTest$VolatileCharStable
 *                              StableValueTest$VolatileDoubleStable StableValueTest$VolatileFloatStable StableValueTest$VolatileIntStable
 *                              StableValueTest$VolatileLongStable StableValueTest$VolatileObjectStable$Values
 *                              StableValueTest$VolatileObjectStable StableValueTest$VolatileShortStable
 *                              StableValueTest$NestedStableField StableValueTest$NestedStableField$A
 *                              StableValueTest$NestedStableField1 StableValueTest$NestedStableField1$A
 *                              StableValueTest$NestedStableField2 StableValueTest$NestedStableField2$A
 *                              StableValueTest$NestedStableField3 StableValueTest$NestedStableField3$A
 *
 * @run main/othervm -Xbootclasspath/a:. -server -XX:-TieredCompilation -Xcomp -XX:+UnlockExperimentalVMOptions
 *                   -XX:+FoldStableValues -XX:CompileOnly=::get,::get1,::get2,::get3,::get4 StableValueTest
 * @run main/othervm -Xbootclasspath/a:. -server -XX:-TieredCompilation -Xcomp -XX:+UnlockExperimentalVMOptions
 *                   -XX:-FoldStableValues -XX:CompileOnly=::get,::get1,::get2,::get3,::get4 StableValueTest
 */
import com.sun.management.HotSpotDiagnosticMXBean;
import com.sun.management.VMOption;
import sun.invoke.Stable;
import sun.management.ManagementFactoryHelper;

import java.lang.reflect.InvocationTargetException;

public class StableValueTest {
    public static void main(String[] args) throws Exception {
        System.out.println("@Stable enabled: "+isStableEnabled);
        System.out.println();

        // @Stable primitive & raw Object fields
        run(ObjectStable.class);
        run(BoolStable.class);
        run(ByteStable.class);
        run(ShortStable.class);
        run(CharStable.class);
        run(IntStable.class);
        run(LongStable.class);
        run(FloatStable.class);
        run(DoubleStable.class);

        // @Stable primitive & raw Object static fields
        run(StaticBoolStable.class);
        run(StaticByteStable.class);
        run(StaticShortStable.class);
        run(StaticCharStable.class);
        run(StaticIntStable.class);
        run(StaticLongStable.class);
        run(StaticFloatStable.class);
        run(StaticDoubleStable.class);

        // @Stable primitive & raw Object volatile instance fields
        run(VolatileObjectStable.class);
        run(VolatileBoolStable.class);
        run(VolatileByteStable.class);
        run(VolatileShortStable.class);
        run(VolatileCharStable.class);
        run(VolatileIntStable.class);
        run(VolatileLongStable.class);
        run(VolatileFloatStable.class);
        run(VolatileDoubleStable.class);

        // @Stable arrays: arity 1-4
        run(IntArrayArity1.class);
        run(IntArrayArity2.class);
        run(IntArrayArity3.class);
        run(IntArrayArity4.class);

        // @Stable Object field: dynamic arrays
        run(ObjectArrayArity0.class);
        run(ObjectArrayArity1.class);

        // Nested @Stable fields
        run(NestedStableField.class);
        run(NestedStableField1.class);
        run(NestedStableField2.class);
        run(NestedStableField3.class);

        if (failed) {
            throw new Error("TEST FAILED");
        }
    }

    /* ==================================================== */

    static class ObjectStable {
        enum Values { A, B}
        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 BoolStable {
        public @Stable boolean v;

        public static final BoolStable c = new BoolStable();
        public static boolean get() { return c.v; }
        public static void test() throws Exception {
            c.v = true; boolean val1 = get();
            c.v = false; boolean val2 = get();
            assertEquals(val1, true);
            assertEquals(val2, (isStableEnabled ? true : false));
        }
    }

    /* ==================================================== */

    static class ByteStable {
        public @Stable byte v;

        public static final ByteStable c = new ByteStable();
        public static byte get() { return c.v; }
        public static void test() throws Exception {
            c.v = 5;   byte val1 = get();
            c.v = 127; byte val2 = get();
            assertEquals(val1, 5);
            assertEquals(val2, (isStableEnabled ? 5 : 127));
        }
    }

    /* ==================================================== */

    static class ShortStable {
        public @Stable short v;

        public static final ShortStable c = new ShortStable();
        public static short get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1;     short val1 = get();
            c.v = 32767; short val2 = get();
            assertEquals(val1, 1);
            assertEquals(val2, (isStableEnabled ? 1 : 32767));
        }
    }

    /* ==================================================== */

    static class CharStable {
        public @Stable char v;

        public static final CharStable c = new CharStable();
        public static char get() { return c.v; }
        public static void test() throws Exception {
            c.v = 'a'; char val1 = get();
            c.v = 'b'; char val2 = get();
            assertEquals(val1, 'a');
            assertEquals(val2, (isStableEnabled ? 'a' : 'b'));
        }
    }

    /* ==================================================== */

    static class IntStable {
        public @Stable int v;

        public static final IntStable c = new IntStable();
        public static int get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1; int val1 = get();
            c.v = 2; int val2 = get();
            assertEquals(val1, 1);
            assertEquals(val2, (isStableEnabled ? 1 : 2));
        }
    }

    /* ==================================================== */

    static class FloatStable {
        public @Stable float v;

        public static final FloatStable c = new FloatStable();
        public static float get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1.0F; float val1 = get();
            c.v = 2.0F; float val2 = get();
            assertEquals(val1, 1.0F);
            assertEquals(val2, (isStableEnabled ? 1.0F : 2.0F));
        }
    }

    /* ==================================================== */

    static class LongStable {
        public @Stable long v;

        public static final LongStable c = new LongStable();
        public static long get() { return c.v; }
        public static void test() throws Exception {
            c.v = 5;              long val1 = get();
            c.v = Long.MAX_VALUE; long val2 = get();
            assertEquals(val1, 5);
            assertEquals(val2, (isStableEnabled ? 5 : Long.MAX_VALUE));
        }
    }

    /* ==================================================== */

    static class DoubleStable {
        public @Stable double v;

        public static final DoubleStable c = new DoubleStable();
        public static double get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1.0; double val1 = get();
            c.v = Double.MAX_VALUE; double val2 = get();
            assertEquals(val1, 1.0);
            assertEquals(val2, (isStableEnabled ? 1.0 : Double.MAX_VALUE));
        }
    }

    /* ==================================================== */

    static class StaticBoolStable {
        public static @Stable boolean v;

        public static final StaticBoolStable c = new StaticBoolStable();
        public static boolean get() { return c.v; }
        public static void test() throws Exception {
            c.v = true; boolean val1 = get();
            c.v = false; boolean val2 = get();
            assertEquals(val1, true);
            assertEquals(val2, (isStableEnabled ? true : false));
        }
    }

    /* ==================================================== */

    static class StaticByteStable {
        public static @Stable byte v;

        public static final StaticByteStable c = new StaticByteStable();
        public static byte get() { return c.v; }
        public static void test() throws Exception {
            c.v = 5;   byte val1 = get();
            c.v = 127; byte val2 = get();
            assertEquals(val1, 5);
            assertEquals(val2, (isStableEnabled ? 5 : 127));
        }
    }

    /* ==================================================== */

    static class StaticShortStable {
        public static @Stable short v;

        public static final StaticShortStable c = new StaticShortStable();
        public static short get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1;     short val1 = get();
            c.v = 32767; short val2 = get();
            assertEquals(val1, 1);
            assertEquals(val2, (isStableEnabled ? 1 : 32767));
        }
    }

    /* ==================================================== */

    static class StaticCharStable {
        public static @Stable char v;

        public static final StaticCharStable c = new StaticCharStable();
        public static char get() { return c.v; }
        public static void test() throws Exception {
            c.v = 'a'; char val1 = get();
            c.v = 'b'; char val2 = get();
            assertEquals(val1, 'a');
            assertEquals(val2, (isStableEnabled ? 'a' : 'b'));
        }
    }

    /* ==================================================== */

    static class StaticIntStable {
        public static @Stable int v;

        public static final StaticIntStable c = new StaticIntStable();
        public static int get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1; int val1 = get();
            c.v = 2; int val2 = get();
            assertEquals(val1, 1);
            assertEquals(val2, (isStableEnabled ? 1 : 2));
        }
    }

    /* ==================================================== */

    static class StaticFloatStable {
        public static @Stable float v;

        public static final StaticFloatStable c = new StaticFloatStable();
        public static float get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1.0F; float val1 = get();
            c.v = 2.0F; float val2 = get();
            assertEquals(val1, 1.0F);
            assertEquals(val2, (isStableEnabled ? 1.0F : 2.0F));
        }
    }

    /* ==================================================== */

    static class StaticLongStable {
        public static @Stable long v;

        public static final StaticLongStable c = new StaticLongStable();
        public static long get() { return c.v; }
        public static void test() throws Exception {
            c.v = 5;              long val1 = get();
            c.v = Long.MAX_VALUE; long val2 = get();
            assertEquals(val1, 5);
            assertEquals(val2, (isStableEnabled ? 5 : Long.MAX_VALUE));
        }
    }

    /* ==================================================== */

    static class StaticDoubleStable {
        public static @Stable double v;

        public static final StaticDoubleStable c = new StaticDoubleStable();
        public static double get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1.0; double val1 = get();
            c.v = Double.MAX_VALUE; double val2 = get();
            assertEquals(val1, 1.0);
            assertEquals(val2, (isStableEnabled ? 1.0 : Double.MAX_VALUE));
        }
    }

    /* ==================================================== */

    static class VolatileObjectStable {
        enum Values { A, B}
        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));
        }
    }

    /* ==================================================== */

    static class VolatileBoolStable {
        public @Stable volatile boolean v;

        public static final VolatileBoolStable c = new VolatileBoolStable();
        public static boolean get() { return c.v; }
        public static void test() throws Exception {
            c.v = true; boolean val1 = get();
            c.v = false; boolean val2 = get();
            assertEquals(val1, true);
            assertEquals(val2, (isStableEnabled ? true : false));
        }
    }

    /* ==================================================== */

    static class VolatileByteStable {
        public @Stable volatile byte v;

        public static final VolatileByteStable c = new VolatileByteStable();
        public static byte get() { return c.v; }
        public static void test() throws Exception {
            c.v = 5;   byte val1 = get();
            c.v = 127; byte val2 = get();
            assertEquals(val1, 5);
            assertEquals(val2, (isStableEnabled ? 5 : 127));
        }
    }

    /* ==================================================== */

    static class VolatileShortStable {
        public @Stable volatile short v;

        public static final VolatileShortStable c = new VolatileShortStable();
        public static short get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1;     short val1 = get();
            c.v = 32767; short val2 = get();
            assertEquals(val1, 1);
            assertEquals(val2, (isStableEnabled ? 1 : 32767));
        }
    }

    /* ==================================================== */

    static class VolatileCharStable {
        public @Stable volatile char v;

        public static final VolatileCharStable c = new VolatileCharStable();
        public static char get() { return c.v; }
        public static void test() throws Exception {
            c.v = 'a'; char val1 = get();
            c.v = 'b'; char val2 = get();
            assertEquals(val1, 'a');
            assertEquals(val2, (isStableEnabled ? 'a' : 'b'));
        }
    }

    /* ==================================================== */

    static class VolatileIntStable {
        public @Stable volatile int v;

        public static final VolatileIntStable c = new VolatileIntStable();
        public static int get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1; int val1 = get();
            c.v = 2; int val2 = get();
            assertEquals(val1, 1);
            assertEquals(val2, (isStableEnabled ? 1 : 2));
        }
    }

    /* ==================================================== */

    static class VolatileFloatStable {
        public @Stable volatile float v;

        public static final VolatileFloatStable c = new VolatileFloatStable();
        public static float get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1.0F; float val1 = get();
            c.v = 2.0F; float val2 = get();
            assertEquals(val1, 1.0F);
            assertEquals(val2, (isStableEnabled ? 1.0F : 2.0F));
        }
    }

    /* ==================================================== */

    static class VolatileLongStable {
        public @Stable volatile long v;

        public static final VolatileLongStable c = new VolatileLongStable();
        public static long get() { return c.v; }
        public static void test() throws Exception {
            c.v = 5;              long val1 = get();
            c.v = Long.MAX_VALUE; long val2 = get();
            assertEquals(val1, 5);
            assertEquals(val2, (isStableEnabled ? 5 : Long.MAX_VALUE));
        }
    }

    /* ==================================================== */

    static class VolatileDoubleStable {
        public @Stable double v;

        public static final VolatileDoubleStable c = new VolatileDoubleStable();
        public static double get() { return c.v; }
        public static void test() throws Exception {
            c.v = 1.0; double val1 = get();
            c.v = Double.MAX_VALUE; double val2 = get();
            assertEquals(val1, 1.0);
            assertEquals(val2, (isStableEnabled ? 1.0 : Double.MAX_VALUE));
        }
    }

    /* ==================================================== */
    // @Stable array == field && all components are stable

    static class IntArrayArity1 {
        public static @Stable int[] v;

        public static final IntArrayArity1 c = new IntArrayArity1();
        public static int get() { return c.v[0]; }
        public static int[] get1() { return c.v; }
        public static void test() throws Exception {
            {
                c.v = new int[1]; c.v[0] = 1; int val1 = get();
                                  c.v[0] = 2; int val2 = get();
                assertEquals(val1, 1);
                assertEquals(val2, (isStableEnabled ? 1 : 2));

                c.v = new int[1]; c.v[0] = 3; int val3 = get();
                assertEquals(val3, (isStableEnabled ? 1 : 3));
            }

            {
                c.v = new int[1]; int[] val1 = get1();
                c.v = new int[1]; int[] val2 = get1();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }
        }
    }

    /* ==================================================== */

    static class IntArrayArity2 {
        public static @Stable int[][] v;

        public static final IntArrayArity2 c = new IntArrayArity2();
        public static int get() { return c.v[0][0]; }
        public static int[] get1() { return c.v[0]; }
        public static int[][] get2() { return c.v; }
        public static void test() throws Exception {
            {
                c.v = new int[1][1]; c.v[0][0] = 1; int val1 = get();
                                     c.v[0][0] = 2; int val2 = get();
                assertEquals(val1, 1);
                assertEquals(val2, (isStableEnabled ? 1 : 2));

                c.v = new int[1][1]; c.v[0][0] = 3; int val3 = get();
                assertEquals(val3, (isStableEnabled ? 1 : 3));

                c.v[0] = new int[1]; c.v[0][0] = 4; int val4 = get();
                assertEquals(val4, (isStableEnabled ? 1 : 4));
            }

            {
                c.v = new int[1][1]; int[] val1 = get1();
                c.v[0] = new int[1]; int[] val2 = get1();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }

            {
                c.v = new int[1][1]; int[][] val1 = get2();
                c.v = new int[1][1]; int[][] val2 = get2();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }
        }
    }

    /* ==================================================== */

    static class IntArrayArity3 {
        public static @Stable int[][][] v;

        public static final IntArrayArity3 c = new IntArrayArity3();
        public static int get() { return c.v[0][0][0]; }
        public static int[] get1() { return c.v[0][0]; }
        public static int[][] get2() { return c.v[0]; }
        public static int[][][] get3() { return c.v; }
        public static void test() throws Exception {
            {
                c.v = new int[1][1][1]; c.v[0][0][0] = 1; int val1 = get();
                c.v[0][0][0] = 2; int val2 = get();
                assertEquals(val1, 1);
                assertEquals(val2, (isStableEnabled ? 1 : 2));

                c.v = new int[1][1][1]; c.v[0][0][0] = 3; int val3 = get();
                assertEquals(val3, (isStableEnabled ? 1 : 3));

                c.v[0] = new int[1][1]; c.v[0][0][0] = 4; int val4 = get();
                assertEquals(val4, (isStableEnabled ? 1 : 4));

                c.v[0][0] = new int[1]; c.v[0][0][0] = 5; int val5 = get();
                assertEquals(val5, (isStableEnabled ? 1 : 5));
            }

            {
                c.v = new int[1][1][1]; int[] val1 = get1();
                c.v[0][0] = new int[1]; int[] val2 = get1();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }

            {
                c.v = new int[1][1][1]; int[][] val1 = get2();
                c.v[0] = new int[1][1]; int[][] val2 = get2();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }

            {
                c.v = new int[1][1][1]; int[][][] val1 = get3();
                c.v = new int[1][1][1]; int[][][] val2 = get3();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }
        }
    }

    /* ==================================================== */

    static class IntArrayArity4 {
        public static @Stable int[][][][] v;

        public static final IntArrayArity4 c = new IntArrayArity4();
        public static int get() { return c.v[0][0][0][0]; }
        public static int[] get1() { return c.v[0][0][0]; }
        public static int[][] get2() { return c.v[0][0]; }
        public static int[][][] get3() { return c.v[0]; }
        public static int[][][][] get4() { return c.v; }
        public static void test() throws Exception {
            {
                c.v = new int[1][1][1][1]; c.v[0][0][0][0] = 1; int val1 = get();
                c.v[0][0][0][0] = 2; int val2 = get();
                assertEquals(val1, 1);
                assertEquals(val2, (isStableEnabled ? 1 : 2));

                c.v = new int[1][1][1][1]; c.v[0][0][0][0] = 3; int val3 = get();
                assertEquals(val3, (isStableEnabled ? 1 : 3));

                c.v[0] = new int[1][1][1]; c.v[0][0][0][0] = 4; int val4 = get();
                assertEquals(val4, (isStableEnabled ? 1 : 4));

                c.v[0][0] = new int[1][1]; c.v[0][0][0][0] = 5; int val5 = get();
                assertEquals(val5, (isStableEnabled ? 1 : 5));

                c.v[0][0][0] = new int[1]; c.v[0][0][0][0] = 6; int val6 = get();
                assertEquals(val6, (isStableEnabled ? 1 : 6));
            }

            {
                c.v = new int[1][1][1][1]; int[] val1 = get1();
                c.v[0][0][0] = new int[1]; int[] val2 = get1();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }

            {
                c.v = new int[1][1][1][1]; int[][] val1 = get2();
                c.v[0][0] = new int[1][1]; int[][] val2 = get2();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }

            {
                c.v = new int[1][1][1][1]; int[][][] val1 = get3();
                c.v[0] = new int[1][1][1]; int[][][] val2 = get3();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }

            {
                c.v = new int[1][1][1][1]; int[][][][] val1 = get4();
                c.v = new int[1][1][1][1]; int[][][][] val2 = get4();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }

        }
    }

    /* ==================================================== */
    // Dynamic arity is higher than static

    static class ObjectArrayArity0 {
        public static @Stable Object v;

        public static final ObjectArrayArity0 c = new ObjectArrayArity0();
        public static int get() { return ((int[])c.v)[0]; }
        public static int[] get1() { return (int[])c.v; }

        public static void test() throws Exception {
            {
                c.v = new int[1]; ((int[])c.v)[0] = 1; int val1 = get();
                                  ((int[])c.v)[0] = 2; int val2 = get();

                assertEquals(val1, 1);
                assertEquals(val2, 2);
            }

            {
                c.v = new int[1]; int[] val1 = get1();
                c.v = new int[1]; int[] val2 = get1();
                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }
        }
    }

    /* ==================================================== */

    static class ObjectArrayArity1 {
        public static @Stable Object[] v;

        public static final ObjectArrayArity1 c = new ObjectArrayArity1();
        public static int get() { return ((int[][])c.v)[0][0]; }
        public static int[] get1() { return (int[])(c.v[0]); }
        public static Object[] get2() { return c.v; }

        public static void test() throws Exception {
            {
                c.v = new int[1][1]; ((int[][])c.v)[0][0] = 1; int val1 = get();
                                     ((int[][])c.v)[0][0] = 2; int val2 = get();

                assertEquals(val1, 1);
                assertEquals(val2, 2);
            }

            {
                c.v = new int[1][1]; c.v[0] = new int[0]; int[] val1 = get1();
                                     c.v[0] = new int[0]; int[] val2 = get1();

                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }

            {
                c.v = new int[0][0]; Object[] val1 = get2();
                c.v = new int[0][0]; Object[] val2 = get2();

                assertTrue((isStableEnabled ? (val1 == val2) : (val1 != val2)));
            }
        }
    }

    /* ==================================================== */

    static class NestedStableField {
        static class A {
            public @Stable int a;

        }
        public static @Stable A v;

        public static final NestedStableField c = new NestedStableField();
        public static A get() { return c.v; }
        public static int get1() { return get().a; }

        public static void test() throws Exception {
            {
                c.v = new A(); c.v.a = 1; A val1 = get();
                               c.v.a = 2; A val2 = get();

                assertEquals(val1.a, 2);
                assertEquals(val2.a, 2);
            }

            {
                c.v = new A(); c.v.a = 1; int val1 = get1();
                               c.v.a = 2; int val2 = get1();
                c.v = new A(); c.v.a = 3; int val3 = get1();

                assertEquals(val1, 1);
                assertEquals(val2, (isStableEnabled ? 1 : 2));
                assertEquals(val3, (isStableEnabled ? 1 : 3));
            }
        }
    }

    /* ==================================================== */

    static class NestedStableField1 {
        static class A {
            public @Stable int a;
            public @Stable A next;
        }
        public static @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 int 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 = 1; c.v.next.a = 1; A val1 = get();
                               c.v.a = 2; c.v.next.a = 2; A val2 = get();

                assertEquals(val1.a, 2);
                assertEquals(val2.a, 2);
            }

            {
                c.v = new A(); c.v.next = c.v;
                               c.v.a = 1; int val1 = get1();
                               c.v.a = 2; int val2 = get1();
                c.v = new A(); c.v.next = c.v;
                               c.v.a = 3; int val3 = get1();

                assertEquals(val1, 1);
                assertEquals(val2, (isStableEnabled ? 1 : 2));
                assertEquals(val3, (isStableEnabled ? 1 : 3));
            }
        }
    }
   /* ==================================================== */

    static class NestedStableField2 {
        static class A {
            public @Stable int a;
            public @Stable A left;
            public         A right;
        }

        public static @Stable A v;

        public static final NestedStableField2 c = new NestedStableField2();
        public static int get() { return c.v.left.left.left.a; }
        public static int 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 = 1; int val1 = get(); int val2 = get1();
                               c.v.a = 2; int val3 = get(); int val4 = get1();

                assertEquals(val1, 1);
                assertEquals(val3, (isStableEnabled ? 1 : 2));

                assertEquals(val2, 1);
                assertEquals(val4, 2);
            }
        }
    }

    /* ==================================================== */

    static class NestedStableField3 {
        static class A {
            public @Stable int a;
            public @Stable A[] left;
            public         A[] right;
        }

        public static @Stable A[] v;

        public static final NestedStableField3 c = new NestedStableField3();
        public static int get() { return c.v[0].left[1].left[0].left[1].a; }
        public static int 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 = 1; int val1 = get(); int val2 = get1();
                               elem.a = 2; int val3 = get(); int val4 = get1();

                assertEquals(val1, 1);
                assertEquals(val3, (isStableEnabled ? 1 : 2));

                assertEquals(val2, 1);
                assertEquals(val4, 2);
            }
        }
    }

    /* ==================================================== */
    // Auxiliary methods
    static void assertEquals(int i, int j) { if (i != j)  throw new AssertionError(i + " != " + j); }
    static void assertEquals(long i, long j) { if (i != j)  throw new AssertionError(i + " != " + j); }
    static void assertEquals(boolean i, boolean j) { if (i != j)  throw new AssertionError(i + " != " + j); }
    static void assertEquals(float i, float j) { if (i != j)  throw new AssertionError(i + " != " + j); }
    static void assertEquals(double i, double j) { if (i != j)  throw new AssertionError(i + " != " + j); }
    static void assertEquals(Object i, Object j) { if (!i.equals(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()));
    }
}