test/1981-structural-redef-private-method-handles/src/art/Test1981.java - LeafOS-Project/android_art - Gitiles

 /*
  * Copyright (C) 2016 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package art;

 import java.lang.invoke.*;
 import java.lang.ref.*;
 import java.lang.reflect.*;
 import java.util.*;

 public class Test1981 {
   // Allow us to hide the var-handle portions when running this on CTS.
   public interface VarHandler {
     public boolean doVarHandleTests();

     public default Object findStaticVarHandle(MethodHandles.Lookup l, Class c, String n, Class t)
         throws Throwable {
       return null;
     }

     public default Object get(Object vh) throws Throwable {
       throw new Error("Illegal call!");
     }

     public default void set(Object vh, Object v) throws Throwable {
       throw new Error("Illegal call!");
     }
     public default boolean instanceofVarHandle(Object v) {
       return false;
     }
     public default Object getVarTypeName(Object v) {
       throw new Error("Illegal call!");
     }
   }

   // CTS Entrypoint.
   public static void run() throws Exception {
     run(() -> false);
   }

   public static void run(VarHandler varhandle_portion) throws Exception {
     Redefinition.setTestConfiguration(Redefinition.Config.COMMON_REDEFINE);
     doTest(varhandle_portion);
   }

   private static final boolean PRINT_NONDETERMINISTIC = false;

   public static WeakHashMap<Object, Long> id_nums = new WeakHashMap<>();
   public static long next_id = 0;

   public static String printGeneric(VarHandler vh, Object o) {
     Long id = id_nums.get(o);
     if (id == null) {
       id = Long.valueOf(next_id++);
       id_nums.put(o, id);
     }
     if (o == null) {
       return "(ID: " + id + ") <NULL>";
     }
     Class oc = o.getClass();
     if (oc.isArray() && oc.getComponentType() == Byte.TYPE) {
       return "(ID: "
           + id
           + ") "
           + Arrays.toString(Arrays.copyOf((byte[]) o, 10)).replace(']', ',')
           + " ...]";
     } else if (vh.instanceofVarHandle(o)) {
       // These don't have a good to-string. Give them one.
       return "(ID: " + id + ") " + o.getClass().getName() + "()->" + vh.getVarTypeName(o);
     } else {
       return "(ID: " + id + ") " + o.toString();
     }
   }

   public static class Transform {
     static {
     }

     private static Object BAR =
         new Object() {
           public String toString() {
             return "value of <" + this.get() + ">";
           }

           public Object get() {
             return "BAR FIELD";
           }
         };
     private static Object FOO =
         new Object() {
           public String toString() {
             return "value of <" + this.get() + ">";
           }

           public Object get() {
             return "FOO FIELD";
           }
         };

     public static MethodHandles.Lookup getLookup() {
       return MethodHandles.lookup();
     }

     public static String staticToString() {
       return Transform.class.toString() + "[FOO: " + FOO + ", BAR: " + BAR + "]";
     }
   }

   /* Base64 encoded class of:
    * public static class Transform {
    *   static {}
    *   // NB This is the order the fields will be laid out in memory.
    *   private static Object BAR;
    *   private static Object BAZ;
    *   private static Object FOO;
    *   public static MethodHandles.Lookup getLookup() { return null; }
    *   private static void reinitialize() {
    *     BAZ = 42;
    *   }
    *   public static String staticToString() {
    *    return Transform.class.toString() + "[FOO: " + FOO + ", BAR: " + BAR + ", BAZ: " + BAZ + "]";
    *   }
    * }
    */
   private static byte[] REDEFINED_DEX_BYTES =
       Base64.getDecoder()
           .decode(
               "ZGV4CjAzNQDY+Vd3k8SVBE6A35RavIBzYN76h51YIqVwBgAAcAAAAHhWNBIAAAAAAAAAAKwFAAAk"
                   + "AAAAcAAAAAwAAAAAAQAABgAAADABAAADAAAAeAEAAAwAAACQAQAAAQAAAPABAABgBAAAEAIAABoD"
                   + "AAAjAwAALAMAADYDAAA+AwAAQwMAAEgDAABNAwAAUAMAAFMDAABXAwAAWwMAAHUDAACFAwAAqQMA"
                   + "AMkDAADcAwAA8QMAAAUEAAAZBAAANAQAAF0EAABsBAAAdwQAAHoEAACCBAAAhQQAAJIEAACaBAAA"
                   + "pQQAAKsEAAC5BAAAyQQAANMEAADaBAAA4wQAAAcAAAALAAAADAAAAA0AAAAOAAAADwAAABAAAAAR"
                   + "AAAAEgAAABMAAAAUAAAAFwAAAAkAAAAGAAAABAMAAAgAAAAIAAAAAAAAAAoAAAAJAAAADAMAAAoA"
                   + "AAAJAAAAFAMAAAgAAAAKAAAAAAAAABcAAAALAAAAAAAAAAEABwAEAAAAAQAHAAUAAAABAAcABgAA"
                   + "AAEABQACAAAAAQAFAAMAAAABAAQAHAAAAAEABQAeAAAAAQABAB8AAAAFAAEAIAAAAAYAAAAiAAAA"
                   + "BwAFAAMAAAAJAAUAAwAAAAkAAgAbAAAACQADABsAAAAJAAEAIAAAAAEAAAABAAAABwAAAAAAAAAV"
                   + "AAAAnAUAAGoFAAAAAAAABQAAAAIAAAD/AgAANgAAABwAAQBuEAUAAAAMAGIBAgBiAgAAYgMBACIE"
                   + "CQBwEAgABABuIAoABAAaABgAbiAKAAQAbiAJABQAGgAAAG4gCgAEAG4gCQAkABoAAQBuIAoABABu"
                   + "IAkANAAaABkAbiAKAAQAbhALAAQADAARAAEAAAAAAAAA9gIAAAIAAAASABEAAAAAAAAAAADuAgAA"
                   + "AQAAAA4AAAABAAEAAQAAAPICAAAEAAAAcBAHAAAADgABAAAAAQAAAPoCAAAJAAAAEwAqAHEQBgAA"
                   + "AAwAaQABAA4ACgAOAAkADgAPAA4AEQAOhwAUAA4AAAEAAAAAAAAAAQAAAAcAAAABAAAACAAHLCBC"
                   + "QVI6IAAHLCBCQVo6IAAIPGNsaW5pdD4ABjxpbml0PgADQkFSAANCQVoAA0ZPTwABSQABTAACTEkA"
                   + "AkxMABhMYXJ0L1Rlc3QxOTgxJFRyYW5zZm9ybTsADkxhcnQvVGVzdDE5ODE7ACJMZGFsdmlrL2Fu"
                   + "bm90YXRpb24vRW5jbG9zaW5nQ2xhc3M7AB5MZGFsdmlrL2Fubm90YXRpb24vSW5uZXJDbGFzczsA"
                   + "EUxqYXZhL2xhbmcvQ2xhc3M7ABNMamF2YS9sYW5nL0ludGVnZXI7ABJMamF2YS9sYW5nL09iamVj"
                   + "dDsAEkxqYXZhL2xhbmcvU3RyaW5nOwAZTGphdmEvbGFuZy9TdHJpbmdCdWlsZGVyOwAnTGphdmEv"
                   + "bGFuZy9pbnZva2UvTWV0aG9kSGFuZGxlcyRMb29rdXA7AA1UZXN0MTk4MS5qYXZhAAlUcmFuc2Zv"
                   + "cm0AAVYABltGT086IAABXQALYWNjZXNzRmxhZ3MABmFwcGVuZAAJZ2V0TG9va3VwAARuYW1lAAxy"
                   + "ZWluaXRpYWxpemUADnN0YXRpY1RvU3RyaW5nAAh0b1N0cmluZwAFdmFsdWUAB3ZhbHVlT2YAdn5+"
                   + "RDh7ImNvbXBpbGF0aW9uLW1vZGUiOiJkZWJ1ZyIsIm1pbi1hcGkiOjEsInNoYS0xIjoiYTgzNTJm"
                   + "MjU0ODg1MzYyY2NkOGQ5MDlkMzUyOWM2MDA5NGRkODk2ZSIsInZlcnNpb24iOiIxLjYuMjAtZGV2"
                   + "In0AAgMBIRgCAgQCGgQJHRcWAwAFAAAKAQoBCgCIgASgBQGBgAS0BQEJjAUBCswFAQmQBAAAAAAC"
                   + "AAAAWwUAAGEFAACQBQAAAAAAAAAAAAAAAAAAEAAAAAAAAAABAAAAAAAAAAEAAAAkAAAAcAAAAAIA"
                   + "AAAMAAAAAAEAAAMAAAAGAAAAMAEAAAQAAAADAAAAeAEAAAUAAAAMAAAAkAEAAAYAAAABAAAA8AEA"
                   + "AAEgAAAFAAAAEAIAAAMgAAAFAAAA7gIAAAEQAAADAAAABAMAAAIgAAAkAAAAGgMAAAQgAAACAAAA"
                   + "WwUAAAAgAAABAAAAagUAAAMQAAACAAAAjAUAAAYgAAABAAAAnAUAAAAQAAABAAAArAUAAA==");

   public static void doTest(VarHandler vh) throws Exception {
     try {
       System.out.println("Initial: " + Transform.staticToString());
       MethodHandles.Lookup lookup = Transform.getLookup();
       String[] names =
           new String[] {
             "FOO", "BAR",
           };
       MethodHandle[] handles =
           new MethodHandle[] {
             lookup.findStaticGetter(Transform.class, "FOO", Object.class),
             lookup.findStaticGetter(Transform.class, "BAR", Object.class),
           };
       Object foo_handle = vh.findStaticVarHandle(lookup, Transform.class, "FOO", Object.class);
       Object[] var_handles =
           new Object[] {
             foo_handle, vh.findStaticVarHandle(lookup, Transform.class, "BAR", Object.class),
           };

       for (int i = 0; i < names.length; i++) {
         System.out.println(
             "Reading field "
                 + names[i]
                 + " using "
                 + printGeneric(vh, handles[i])
                 + " = "
                 + printGeneric(vh, handles[i].invoke()));
         if (vh.doVarHandleTests()) {
           System.out.println(
               "Reading field "
                   + names[i]
                   + " using "
                   + printGeneric(vh, var_handles[i])
                   + " = "
                   + printGeneric(vh, vh.get(var_handles[i])));
         }
       }
       MethodHandle old_field_write = lookup.findStaticSetter(Transform.class, "FOO", Object.class);

       System.out.println("Redefining Transform class");
       Redefinition.doCommonStructuralClassRedefinition(Transform.class, REDEFINED_DEX_BYTES);
       System.out.println("Post redefinition : " + Transform.staticToString());

       String[] new_names =
           new String[] {
             "BAZ", "FOO", "BAR",
           };
       MethodHandle[] new_handles =
           new MethodHandle[] {
             lookup.findStaticGetter(Transform.class, "BAZ", Object.class),
             lookup.findStaticGetter(Transform.class, "FOO", Object.class),
             lookup.findStaticGetter(Transform.class, "BAR", Object.class),
           };
       Object baz_handle = vh.findStaticVarHandle(lookup, Transform.class, "BAZ", Object.class);
       Object[] new_var_handles =
           new Object[] {
             baz_handle,
             vh.findStaticVarHandle(lookup, Transform.class, "FOO", Object.class),
             vh.findStaticVarHandle(lookup, Transform.class, "BAR", Object.class),
           };

       for (int i = 0; i < names.length; i++) {
         System.out.println(
             "Reading field "
                 + names[i]
                 + " using "
                 + printGeneric(vh, handles[i])
                 + " = "
                 + printGeneric(vh, handles[i].invoke()));
         if (vh.doVarHandleTests()) {
           System.out.println(
               "Reading field "
                   + names[i]
                   + " using "
                   + printGeneric(vh, var_handles[i])
                   + " = "
                   + printGeneric(vh, vh.get(var_handles[i])));
         }
       }

       for (int i = 0; i < new_names.length; i++) {
         System.out.println(
             "Reading new field "
                 + new_names[i]
                 + " using "
                 + printGeneric(vh, new_handles[i])
                 + " = "
                 + printGeneric(vh, new_handles[i].invoke()));
         if (vh.doVarHandleTests()) {
           System.out.println(
               "Reading new field "
                   + new_names[i]
                   + " using "
                   + printGeneric(vh, new_var_handles[i])
                   + " = "
                   + printGeneric(vh, vh.get(new_var_handles[i])));
         }
       }

       String val = "foo";
       System.out.println("Setting BAZ to " + printGeneric(vh, val) + " with new mh.");
       lookup.findStaticSetter(Transform.class, "BAZ", Object.class).invoke(val);
       System.out.println("Post set with new mh: " + Transform.staticToString());

       System.out.println("Setting FOO to " + printGeneric(vh, Transform.class) + " with old mh.");
       old_field_write.invoke(Transform.class);
       System.out.println("Post set with old mh: " + Transform.staticToString());

       Object new_val =
           new Object() {
             public String toString() {
               return "new_value object";
             }
           };
       if (vh.doVarHandleTests()) {
         System.out.println("Setting FOO to '" + printGeneric(vh, new_val) + "' with old varhandle.");
         vh.set(foo_handle, new_val);
         System.out.println("Post set with new varhandle: " + Transform.staticToString());

         System.out.println("Setting BAZ to 'bar' with new varhandle.");
         vh.set(baz_handle, "bar");
         System.out.println("Post set with old varhandle: " + Transform.staticToString());
       }

       System.out.println("Using mh to call new private method.");
       MethodHandle reinit =
           lookup.findStatic(Transform.class, "reinitialize", MethodType.methodType(Void.TYPE));
       reinit.invoke();
       System.out.println("Post reinit with mh: " + Transform.staticToString());

       for (int i = 0; i < names.length; i++) {
         System.out.println(
             "Reading field "
                 + names[i]
                 + " using "
                 + printGeneric(vh, handles[i])
                 + " = "
                 + printGeneric(vh, handles[i].invoke()));
         if (vh.doVarHandleTests()) {
           System.out.println(
               "Reading field "
                   + names[i]
                   + " using "
                   + printGeneric(vh, var_handles[i])
                   + " = "
                   + printGeneric(vh, vh.get(var_handles[i])));
         }
       }
       for (int i = 0; i < new_names.length; i++) {
         System.out.println(
             "Reading new field "
                 + new_names[i]
                 + " using "
                 + printGeneric(vh, new_handles[i])
                 + " = "
                 + printGeneric(vh, new_handles[i].invoke()));
         if (vh.doVarHandleTests()) {
           System.out.println(
               "Reading new field "
                   + new_names[i]
                   + " using "
                   + printGeneric(vh, new_var_handles[i])
                   + " = "
                   + printGeneric(vh, vh.get(new_var_handles[i])));
         }
       }
     } catch (Throwable t) {
       if (t instanceof Exception) {
         throw (Exception) t;
       } else if (t instanceof Error) {
         throw (Error) t;
       } else {
         throw new RuntimeException("Unexpected throwable!", t);
       }
     }
   }
 }
	/*
	* Copyright (C) 2016 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package art;

	import java.lang.invoke.*;
	import java.lang.ref.*;
	import java.lang.reflect.*;
	import java.util.*;

	public class Test1981 {
	// Allow us to hide the var-handle portions when running this on CTS.
	public interface VarHandler {
	public boolean doVarHandleTests();

	public default Object findStaticVarHandle(MethodHandles.Lookup l, Class c, String n, Class t)
	throws Throwable {
	return null;
	}

	public default Object get(Object vh) throws Throwable {
	throw new Error("Illegal call!");
	}

	public default void set(Object vh, Object v) throws Throwable {
	throw new Error("Illegal call!");
	}
	public default boolean instanceofVarHandle(Object v) {
	return false;
	}
	public default Object getVarTypeName(Object v) {
	throw new Error("Illegal call!");
	}
	}

	// CTS Entrypoint.
	public static void run() throws Exception {
	run(() -> false);
	}

	public static void run(VarHandler varhandle_portion) throws Exception {
	Redefinition.setTestConfiguration(Redefinition.Config.COMMON_REDEFINE);
	doTest(varhandle_portion);
	}

	private static final boolean PRINT_NONDETERMINISTIC = false;

	public static WeakHashMap<Object, Long> id_nums = new WeakHashMap<>();
	public static long next_id = 0;

	public static String printGeneric(VarHandler vh, Object o) {
	Long id = id_nums.get(o);
	if (id == null) {
	id = Long.valueOf(next_id++);
	id_nums.put(o, id);
	}
	if (o == null) {
	return "(ID: " + id + ") <NULL>";
	}
	Class oc = o.getClass();
	if (oc.isArray() && oc.getComponentType() == Byte.TYPE) {
	return "(ID: "
	+ id
	+ ") "
	+ Arrays.toString(Arrays.copyOf((byte[]) o, 10)).replace(']', ',')
	+ " ...]";
	} else if (vh.instanceofVarHandle(o)) {
	// These don't have a good to-string. Give them one.
	return "(ID: " + id + ") " + o.getClass().getName() + "()->" + vh.getVarTypeName(o);
	} else {
	return "(ID: " + id + ") " + o.toString();
	}
	}

	public static class Transform {
	static {
	}

	private static Object BAR =
	new Object() {
	public String toString() {
	return "value of <" + this.get() + ">";
	}

	public Object get() {
	return "BAR FIELD";
	}
	};
	private static Object FOO =
	new Object() {
	public String toString() {
	return "value of <" + this.get() + ">";
	}

	public Object get() {
	return "FOO FIELD";
	}
	};

	public static MethodHandles.Lookup getLookup() {
	return MethodHandles.lookup();
	}

	public static String staticToString() {
	return Transform.class.toString() + "[FOO: " + FOO + ", BAR: " + BAR + "]";
	}
	}

	/* Base64 encoded class of:
	* public static class Transform {
	* static {}
	* // NB This is the order the fields will be laid out in memory.
	* private static Object BAR;
	* private static Object BAZ;
	* private static Object FOO;
	* public static MethodHandles.Lookup getLookup() { return null; }
	* private static void reinitialize() {
	* BAZ = 42;
	* }
	* public static String staticToString() {
	* return Transform.class.toString() + "[FOO: " + FOO + ", BAR: " + BAR + ", BAZ: " + BAZ + "]";
	* }
	* }
	*/
	private static byte[] REDEFINED_DEX_BYTES =
	Base64.getDecoder()
	.decode(
	"ZGV4CjAzNQDY+Vd3k8SVBE6A35RavIBzYN76h51YIqVwBgAAcAAAAHhWNBIAAAAAAAAAAKwFAAAk"
	+ "AAAAcAAAAAwAAAAAAQAABgAAADABAAADAAAAeAEAAAwAAACQAQAAAQAAAPABAABgBAAAEAIAABoD"
	+ "AAAjAwAALAMAADYDAAA+AwAAQwMAAEgDAABNAwAAUAMAAFMDAABXAwAAWwMAAHUDAACFAwAAqQMA"
	+ "AMkDAADcAwAA8QMAAAUEAAAZBAAANAQAAF0EAABsBAAAdwQAAHoEAACCBAAAhQQAAJIEAACaBAAA"
	+ "pQQAAKsEAAC5BAAAyQQAANMEAADaBAAA4wQAAAcAAAALAAAADAAAAA0AAAAOAAAADwAAABAAAAAR"
	+ "AAAAEgAAABMAAAAUAAAAFwAAAAkAAAAGAAAABAMAAAgAAAAIAAAAAAAAAAoAAAAJAAAADAMAAAoA"
	+ "AAAJAAAAFAMAAAgAAAAKAAAAAAAAABcAAAALAAAAAAAAAAEABwAEAAAAAQAHAAUAAAABAAcABgAA"
	+ "AAEABQACAAAAAQAFAAMAAAABAAQAHAAAAAEABQAeAAAAAQABAB8AAAAFAAEAIAAAAAYAAAAiAAAA"
	+ "BwAFAAMAAAAJAAUAAwAAAAkAAgAbAAAACQADABsAAAAJAAEAIAAAAAEAAAABAAAABwAAAAAAAAAV"
	+ "AAAAnAUAAGoFAAAAAAAABQAAAAIAAAD/AgAANgAAABwAAQBuEAUAAAAMAGIBAgBiAgAAYgMBACIE"
	+ "CQBwEAgABABuIAoABAAaABgAbiAKAAQAbiAJABQAGgAAAG4gCgAEAG4gCQAkABoAAQBuIAoABABu"
	+ "IAkANAAaABkAbiAKAAQAbhALAAQADAARAAEAAAAAAAAA9gIAAAIAAAASABEAAAAAAAAAAADuAgAA"
	+ "AQAAAA4AAAABAAEAAQAAAPICAAAEAAAAcBAHAAAADgABAAAAAQAAAPoCAAAJAAAAEwAqAHEQBgAA"
	+ "AAwAaQABAA4ACgAOAAkADgAPAA4AEQAOhwAUAA4AAAEAAAAAAAAAAQAAAAcAAAABAAAACAAHLCBC"
	+ "QVI6IAAHLCBCQVo6IAAIPGNsaW5pdD4ABjxpbml0PgADQkFSAANCQVoAA0ZPTwABSQABTAACTEkA"
	+ "AkxMABhMYXJ0L1Rlc3QxOTgxJFRyYW5zZm9ybTsADkxhcnQvVGVzdDE5ODE7ACJMZGFsdmlrL2Fu"
	+ "bm90YXRpb24vRW5jbG9zaW5nQ2xhc3M7AB5MZGFsdmlrL2Fubm90YXRpb24vSW5uZXJDbGFzczsA"
	+ "EUxqYXZhL2xhbmcvQ2xhc3M7ABNMamF2YS9sYW5nL0ludGVnZXI7ABJMamF2YS9sYW5nL09iamVj"
	+ "dDsAEkxqYXZhL2xhbmcvU3RyaW5nOwAZTGphdmEvbGFuZy9TdHJpbmdCdWlsZGVyOwAnTGphdmEv"
	+ "bGFuZy9pbnZva2UvTWV0aG9kSGFuZGxlcyRMb29rdXA7AA1UZXN0MTk4MS5qYXZhAAlUcmFuc2Zv"
	+ "cm0AAVYABltGT086IAABXQALYWNjZXNzRmxhZ3MABmFwcGVuZAAJZ2V0TG9va3VwAARuYW1lAAxy"
	+ "ZWluaXRpYWxpemUADnN0YXRpY1RvU3RyaW5nAAh0b1N0cmluZwAFdmFsdWUAB3ZhbHVlT2YAdn5+"
	+ "RDh7ImNvbXBpbGF0aW9uLW1vZGUiOiJkZWJ1ZyIsIm1pbi1hcGkiOjEsInNoYS0xIjoiYTgzNTJm"
	+ "MjU0ODg1MzYyY2NkOGQ5MDlkMzUyOWM2MDA5NGRkODk2ZSIsInZlcnNpb24iOiIxLjYuMjAtZGV2"
	+ "In0AAgMBIRgCAgQCGgQJHRcWAwAFAAAKAQoBCgCIgASgBQGBgAS0BQEJjAUBCswFAQmQBAAAAAAC"
	+ "AAAAWwUAAGEFAACQBQAAAAAAAAAAAAAAAAAAEAAAAAAAAAABAAAAAAAAAAEAAAAkAAAAcAAAAAIA"
	+ "AAAMAAAAAAEAAAMAAAAGAAAAMAEAAAQAAAADAAAAeAEAAAUAAAAMAAAAkAEAAAYAAAABAAAA8AEA"
	+ "AAEgAAAFAAAAEAIAAAMgAAAFAAAA7gIAAAEQAAADAAAABAMAAAIgAAAkAAAAGgMAAAQgAAACAAAA"
	+ "WwUAAAAgAAABAAAAagUAAAMQAAACAAAAjAUAAAYgAAABAAAAnAUAAAAQAAABAAAArAUAAA==");

	public static void doTest(VarHandler vh) throws Exception {
	try {
	System.out.println("Initial: " + Transform.staticToString());
	MethodHandles.Lookup lookup = Transform.getLookup();
	String[] names =
	new String[] {
	"FOO", "BAR",
	};
	MethodHandle[] handles =
	new MethodHandle[] {
	lookup.findStaticGetter(Transform.class, "FOO", Object.class),
	lookup.findStaticGetter(Transform.class, "BAR", Object.class),
	};
	Object foo_handle = vh.findStaticVarHandle(lookup, Transform.class, "FOO", Object.class);
	Object[] var_handles =
	new Object[] {
	foo_handle, vh.findStaticVarHandle(lookup, Transform.class, "BAR", Object.class),
	};

	for (int i = 0; i < names.length; i++) {
	System.out.println(
	"Reading field "
	+ names[i]
	+ " using "
	+ printGeneric(vh, handles[i])
	+ " = "
	+ printGeneric(vh, handles[i].invoke()));
	if (vh.doVarHandleTests()) {
	System.out.println(
	"Reading field "
	+ names[i]
	+ " using "
	+ printGeneric(vh, var_handles[i])
	+ " = "
	+ printGeneric(vh, vh.get(var_handles[i])));
	}
	}
	MethodHandle old_field_write = lookup.findStaticSetter(Transform.class, "FOO", Object.class);

	System.out.println("Redefining Transform class");
	Redefinition.doCommonStructuralClassRedefinition(Transform.class, REDEFINED_DEX_BYTES);
	System.out.println("Post redefinition : " + Transform.staticToString());

	String[] new_names =
	new String[] {
	"BAZ", "FOO", "BAR",
	};
	MethodHandle[] new_handles =
	new MethodHandle[] {
	lookup.findStaticGetter(Transform.class, "BAZ", Object.class),
	lookup.findStaticGetter(Transform.class, "FOO", Object.class),
	lookup.findStaticGetter(Transform.class, "BAR", Object.class),
	};
	Object baz_handle = vh.findStaticVarHandle(lookup, Transform.class, "BAZ", Object.class);
	Object[] new_var_handles =
	new Object[] {
	baz_handle,
	vh.findStaticVarHandle(lookup, Transform.class, "FOO", Object.class),
	vh.findStaticVarHandle(lookup, Transform.class, "BAR", Object.class),
	};

	for (int i = 0; i < names.length; i++) {
	System.out.println(
	"Reading field "
	+ names[i]
	+ " using "
	+ printGeneric(vh, handles[i])
	+ " = "
	+ printGeneric(vh, handles[i].invoke()));
	if (vh.doVarHandleTests()) {
	System.out.println(
	"Reading field "
	+ names[i]
	+ " using "
	+ printGeneric(vh, var_handles[i])
	+ " = "
	+ printGeneric(vh, vh.get(var_handles[i])));
	}
	}

	for (int i = 0; i < new_names.length; i++) {
	System.out.println(
	"Reading new field "
	+ new_names[i]
	+ " using "
	+ printGeneric(vh, new_handles[i])
	+ " = "
	+ printGeneric(vh, new_handles[i].invoke()));
	if (vh.doVarHandleTests()) {
	System.out.println(
	"Reading new field "
	+ new_names[i]
	+ " using "
	+ printGeneric(vh, new_var_handles[i])
	+ " = "
	+ printGeneric(vh, vh.get(new_var_handles[i])));
	}
	}

	String val = "foo";
	System.out.println("Setting BAZ to " + printGeneric(vh, val) + " with new mh.");
	lookup.findStaticSetter(Transform.class, "BAZ", Object.class).invoke(val);
	System.out.println("Post set with new mh: " + Transform.staticToString());

	System.out.println("Setting FOO to " + printGeneric(vh, Transform.class) + " with old mh.");
	old_field_write.invoke(Transform.class);
	System.out.println("Post set with old mh: " + Transform.staticToString());

	Object new_val =
	new Object() {
	public String toString() {
	return "new_value object";
	}
	};
	if (vh.doVarHandleTests()) {
	System.out.println("Setting FOO to '" + printGeneric(vh, new_val) + "' with old varhandle.");
	vh.set(foo_handle, new_val);
	System.out.println("Post set with new varhandle: " + Transform.staticToString());

	System.out.println("Setting BAZ to 'bar' with new varhandle.");
	vh.set(baz_handle, "bar");
	System.out.println("Post set with old varhandle: " + Transform.staticToString());
	}

	System.out.println("Using mh to call new private method.");
	MethodHandle reinit =
	lookup.findStatic(Transform.class, "reinitialize", MethodType.methodType(Void.TYPE));
	reinit.invoke();
	System.out.println("Post reinit with mh: " + Transform.staticToString());

	for (int i = 0; i < names.length; i++) {
	System.out.println(
	"Reading field "
	+ names[i]
	+ " using "
	+ printGeneric(vh, handles[i])
	+ " = "
	+ printGeneric(vh, handles[i].invoke()));
	if (vh.doVarHandleTests()) {
	System.out.println(
	"Reading field "
	+ names[i]
	+ " using "
	+ printGeneric(vh, var_handles[i])
	+ " = "
	+ printGeneric(vh, vh.get(var_handles[i])));
	}
	}
	for (int i = 0; i < new_names.length; i++) {
	System.out.println(
	"Reading new field "
	+ new_names[i]
	+ " using "
	+ printGeneric(vh, new_handles[i])
	+ " = "
	+ printGeneric(vh, new_handles[i].invoke()));
	if (vh.doVarHandleTests()) {
	System.out.println(
	"Reading new field "
	+ new_names[i]
	+ " using "
	+ printGeneric(vh, new_var_handles[i])
	+ " = "
	+ printGeneric(vh, vh.get(new_var_handles[i])));
	}
	}
	} catch (Throwable t) {
	if (t instanceof Exception) {
	throw (Exception) t;
	} else if (t instanceof Error) {
	throw (Error) t;
	} else {
	throw new RuntimeException("Unexpected throwable!", t);
	}
	}
	}
	}