test/1980-obsolete-object-cleared/src/Main.java - platform/art - Git at Google

 /*
  * Copyright (C) 2017 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.
  */

 import art.*;
 import java.lang.ref.*;
 import java.lang.reflect.*;
 import java.util.*;
 import java.util.function.Consumer;
 import sun.misc.Unsafe;

 public class Main {
   public static class Transform {
     static {
     }

     public static Object SECRET_ARRAY = new byte[] {1, 2, 3, 4};
     public static long SECRET_NUMBER = 42;

     public static void foo() {}
   }

   /* Base64 for
    * public static class Trasform {
    *   static {}
    *   public static Object AAA_PADDING;
    *   public static Object SECRET_ARRAY;
    *   public static long SECRET_NUMBER;
    *   public static void foo() {}
    *   public static void bar() {}
    * }
    */
   public static final byte[] REDEFINED_DEX_FILE =
       Base64.getDecoder()
           .decode(
               "ZGV4CjAzNQDdmsOAlizFD4Ogb6+/mfSdVzhmL8e/mRcYBAAAcAAAAHhWNBIAAAAAAAAAAGADAAAU"
                   + "AAAAcAAAAAcAAADAAAAAAQAAANwAAAADAAAA6AAAAAUAAAAAAQAAAQAAACgBAADQAgAASAEAAKwB"
                   + "AAC2AQAAvgEAAMsBAADOAQAA4AEAAOgBAAAMAgAALAIAAEACAABLAgAAWQIAAGgCAABzAgAAdgIA"
                   + "AIMCAACIAgAAjQIAAJMCAACaAgAAAwAAAAQAAAAFAAAABgAAAAcAAAAIAAAADQAAAA0AAAAGAAAA"
                   + "AAAAAAEABQACAAAAAQAFAAoAAAABAAAACwAAAAEAAAAAAAAAAQAAAAEAAAABAAAADwAAAAEAAAAQ"
                   + "AAAABQAAAAEAAAABAAAAAQAAAAUAAAAAAAAACQAAAFADAAAhAwAAAAAAAAAAAAAAAAAAmgEAAAEA"
                   + "AAAOAAAAAQABAAEAAACeAQAABAAAAHAQBAAAAA4AAAAAAAAAAACiAQAAAQAAAA4AAAAAAAAAAAAA"
                   + "AKYBAAABAAAADgAHAA4ABgAOAAsADgAKAA4AAAAIPGNsaW5pdD4ABjxpbml0PgALQUFBX1BBRERJ"
                   + "TkcAAUoAEExNYWluJFRyYW5zZm9ybTsABkxNYWluOwAiTGRhbHZpay9hbm5vdGF0aW9uL0VuY2xv"
                   + "c2luZ0NsYXNzOwAeTGRhbHZpay9hbm5vdGF0aW9uL0lubmVyQ2xhc3M7ABJMamF2YS9sYW5nL09i"
                   + "amVjdDsACU1haW4uamF2YQAMU0VDUkVUX0FSUkFZAA1TRUNSRVRfTlVNQkVSAAlUcmFuc2Zvcm0A"
                   + "AVYAC2FjY2Vzc0ZsYWdzAANiYXIAA2ZvbwAEbmFtZQAFdmFsdWUAdn5+RDh7ImNvbXBpbGF0aW9u"
                   + "LW1vZGUiOiJkZWJ1ZyIsIm1pbi1hcGkiOjEsInNoYS0xIjoiYTgzNTJmMjU0ODg1MzYyY2NkOGQ5"
                   + "MDlkMzUyOWM2MDA5NGRkODk2ZSIsInZlcnNpb24iOiIxLjYuMjAtZGV2In0AAgMBEhgCAgQCDgQJ"
                   + "ERcMAwAEAAAJAQkBCQCIgATIAgGBgATcAgEJ9AIBCYgDAAAAAAACAAAAEgMAABgDAABEAwAAAAAA"
                   + "AAAAAAAAAAAADwAAAAAAAAABAAAAAAAAAAEAAAAUAAAAcAAAAAIAAAAHAAAAwAAAAAMAAAABAAAA"
                   + "3AAAAAQAAAADAAAA6AAAAAUAAAAFAAAAAAEAAAYAAAABAAAAKAEAAAEgAAAEAAAASAEAAAMgAAAE"
                   + "AAAAmgEAAAIgAAAUAAAArAEAAAQgAAACAAAAEgMAAAAgAAABAAAAIQMAAAMQAAACAAAAQAMAAAYg"
                   + "AAABAAAAUAMAAAAQAAABAAAAYAMAAA==");

   private interface TConsumer<T> {
     public void accept(T t) throws Exception;
   }

   private interface ResetIterator<T> extends Iterator<T> {
     public void reset();
   }

   private static final class BaseResetIter implements ResetIterator<Object[]> {
     private boolean have_next = true;

     public Object[] next() {
       if (have_next) {
         have_next = false;
         return new Object[0];
       } else {
         throw new NoSuchElementException("only one element");
       }
     }

     public boolean hasNext() {
       return have_next;
     }

     public void reset() {
       have_next = true;
     }
   }

   public static void main(String[] args) throws Exception {
     System.loadLibrary(args[0]);
     Redefinition.setTestConfiguration(Redefinition.Config.COMMON_REDEFINE);

     // Get the Unsafe object.
     Field f = Unsafe.class.getDeclaredField("THE_ONE");
     f.setAccessible(true);
     Unsafe u = (Unsafe) f.get(null);

     // Get the offsets into the original Transform class of the fields
     long off_secret_array = genericFieldOffset(Transform.class.getDeclaredField("SECRET_ARRAY"));
     long off_secret_number = genericFieldOffset(Transform.class.getDeclaredField("SECRET_NUMBER"));

     System.out.println("Reading normally.");
     System.out.println("\tOriginal secret number is: " + Transform.SECRET_NUMBER);
     System.out.println("\tOriginal secret array is: " + Arrays.toString((byte[])Transform.SECRET_ARRAY));
     System.out.println("Using unsafe to access values directly from memory.");
     System.out.println(
         "\tOriginal secret number is: " + u.getLong(Transform.class, off_secret_number));
     System.out.println(
         "\tOriginal secret array is: "
             + Arrays.toString((byte[]) u.getObject(Transform.class, off_secret_array)));

     // Redefine in a way that changes the offsets.
     Redefinition.doCommonStructuralClassRedefinition(Transform.class, REDEFINED_DEX_FILE);

     // Make sure the value is the same.
     System.out.println("Reading normally post redefinition.");
     System.out.println("\tPost-redefinition secret number is: " + Transform.SECRET_NUMBER);
     System.out.println("\tPost-redefinition secret array is: " + Arrays.toString((byte[])Transform.SECRET_ARRAY));

     // Get the (old) obsolete class from the ClassExt
     Field ext_field = Class.class.getDeclaredField("extData");
     ext_field.setAccessible(true);
     Object ext_data = ext_field.get(Transform.class);
     Field oc_field = ext_data.getClass().getDeclaredField("obsoleteClass");
     oc_field.setAccessible(true);
     Class<?> obsolete_class = (Class<?>) oc_field.get(ext_data);

     // Try reading the fields directly out of memory using unsafe.
     System.out.println("Obsolete class is: " + obsolete_class);
     System.out.println("Using unsafe to access obsolete values directly from memory.");
     System.out.println(
         "\tObsolete secret number is: " + u.getLong(obsolete_class, off_secret_number));
     System.out.println(
         "\tObsolete secret array is: "
             + Arrays.toString((byte[]) u.getObject(obsolete_class, off_secret_array)));

     // Try calling all the public, non-static methods on the obsolete class. Make sure we cannot get
     // j.l.r.{Method,Field} objects or instances.
     TConsumer<Class> cc =
         (Class c) -> {
           for (Method m : Class.class.getDeclaredMethods()) {
             if (Modifier.isPublic(m.getModifiers()) && !Modifier.isStatic(m.getModifiers())) {
               Iterable<Object[]> iter = CollectParameterValues(m, obsolete_class);
               System.out.println("Calling " + m + " with params: " + iter);
               for (Object[] arr : iter) {
                 try {
                   System.out.println(
                       m
                           + " on "
                           + safePrint(c)
                           + " with "
                           + deepPrint(arr)
                           + " = "
                           + safePrint(m.invoke(c, arr)));
                 } catch (Throwable e) {
                   System.out.println(
                       m + " with " + deepPrint(arr) + " throws " + safePrint(e) + ": " + safePrint(e.getCause()));
                 }
               }
             }
           }
         };
     System.out.println("\n\nUsing obsolete class object!\n\n");
     cc.accept(obsolete_class);
     System.out.println("\n\nUsing non-obsolete class object!\n\n");
     cc.accept(Transform.class);
   }

   public static Iterable<Object[]> CollectParameterValues(Method m, Class<?> obsolete_class) throws Exception {
     Class<?>[] types = m.getParameterTypes();
     final Object[][] params = new Object[types.length][];
     for (int i = 0; i < types.length; i++) {
       if (types[i].equals(Class.class)) {
         params[i] =
             new Object[] {
               null, Object.class, obsolete_class, Transform.class, Long.TYPE, Class.class
             };
       } else if (types[i].equals(Boolean.TYPE)) {
         params[i] = new Object[] {Boolean.TRUE, Boolean.FALSE};
       } else if (types[i].equals(String.class)) {
         params[i] = new Object[] {"NOT_USED_STRING", "foo", "SECRET_ARRAY"};
       } else if (types[i].equals(Object.class)) {
         params[i] = new Object[] {null, "foo", "NOT_USED_STRING", Transform.class};
       } else if (types[i].isArray()) {
         params[i] = new Object[] {new Object[0], new Class[0], null};
       } else {
         throw new Exception("Unknown type " + types[i] + " at " + i + " in " + m);
       }
     }
     // Build the reset-iter.
     ResetIterator<Object[]> iter = new BaseResetIter();
     for (int i = params.length - 1; i >= 0; i--) {
       iter = new ComboIter(Arrays.asList(params[i]), iter);
     }
     final Iterator<Object[]> fiter = iter;
     // Wrap in an iterator with a useful toString method.
     return new Iterable<Object[]>() {
       public Iterator<Object[]> iterator() { return fiter; }
       public String toString() { return deepPrint(params); }
     };
   }

   public static String deepPrint(Object[] o) {
     return Arrays.toString(
         Arrays.stream(o)
             .map(
                 (x) -> {
                   if (x == null) {
                     return "null";
                   } else if (x.getClass().isArray()) {
                     if (((Object[]) x).length == 0) {
                       return "new " + x.getClass().getComponentType().getName() + "[0]";
                     } else {
                       return deepPrint((Object[]) x);
                     }
                   } else {
                     return safePrint(x);
                   }
                 })
             .toArray());
   }

   public static String safePrint(Object o) {
     if (o instanceof ClassLoader) {
       return o.getClass().getName();
     } else if (o == null) {
       return "null";
     } else if (o instanceof Exception) {
       String res = o.toString();
       if (res.endsWith("-transformed)")) {
         res = res.substring(0, res.lastIndexOf(" ")) + " <transformed-jar>)";
       } else if (res.endsWith(".jar)")) {
         res = res.substring(0, res.lastIndexOf(" ")) + " <original-jar>)";
       }
       return res;
     } else if (o instanceof Transform) {
       return "Transform Instance";
     } else if (o instanceof Class && isObsoleteObject((Class) o)) {
       return "(obsolete)" + o.toString();
     } else if (o.getClass().isArray()) {
       return Arrays.toString((Object[])o);
     } else {
       return o.toString();
     }
   }

   private static class ComboIter implements ResetIterator<Object[]> {
     private ResetIterator<Object[]> next;
     private Object cur;
     private boolean first;
     private Iterator<Object> my_vals;
     private Iterable<Object> my_vals_reset;

     public Object[] next() {
       if (!next.hasNext()) {
         cur = my_vals.next();
         first = false;
         if (next != null) {
           next.reset();
         }
       }
       if (first) {
         first = false;
         cur = my_vals.next();
       }
       Object[] nv = next.next();
       Object[] res = new Object[nv.length + 1];
       res[0] = cur;
       for (int i = 0; i < nv.length; i++) {
         res[i + 1] = nv[i];
       }
       return res;
     }

     public boolean hasNext() {
       return next.hasNext() || my_vals.hasNext();
     }

     public void reset() {
       my_vals = my_vals_reset.iterator();
       next.reset();
       cur = null;
       first = true;
     }

     public ComboIter(Iterable<Object> this_reset, ResetIterator<Object[]> next_reset) {
       my_vals_reset = this_reset;
       next = next_reset;
       reset();
     }
   }

   public static native long genericFieldOffset(Field f);

   public static native boolean isObsoleteObject(Class c);
 }
	/*
	* Copyright (C) 2017 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.
	*/

	import art.*;
	import java.lang.ref.*;
	import java.lang.reflect.*;
	import java.util.*;
	import java.util.function.Consumer;
	import sun.misc.Unsafe;

	public class Main {
	public static class Transform {
	static {
	}

	public static Object SECRET_ARRAY = new byte[] {1, 2, 3, 4};
	public static long SECRET_NUMBER = 42;

	public static void foo() {}
	}

	/* Base64 for
	* public static class Trasform {
	* static {}
	* public static Object AAA_PADDING;
	* public static Object SECRET_ARRAY;
	* public static long SECRET_NUMBER;
	* public static void foo() {}
	* public static void bar() {}
	* }
	*/
	public static final byte[] REDEFINED_DEX_FILE =
	Base64.getDecoder()
	.decode(
	"ZGV4CjAzNQDdmsOAlizFD4Ogb6+/mfSdVzhmL8e/mRcYBAAAcAAAAHhWNBIAAAAAAAAAAGADAAAU"
	+ "AAAAcAAAAAcAAADAAAAAAQAAANwAAAADAAAA6AAAAAUAAAAAAQAAAQAAACgBAADQAgAASAEAAKwB"
	+ "AAC2AQAAvgEAAMsBAADOAQAA4AEAAOgBAAAMAgAALAIAAEACAABLAgAAWQIAAGgCAABzAgAAdgIA"
	+ "AIMCAACIAgAAjQIAAJMCAACaAgAAAwAAAAQAAAAFAAAABgAAAAcAAAAIAAAADQAAAA0AAAAGAAAA"
	+ "AAAAAAEABQACAAAAAQAFAAoAAAABAAAACwAAAAEAAAAAAAAAAQAAAAEAAAABAAAADwAAAAEAAAAQ"
	+ "AAAABQAAAAEAAAABAAAAAQAAAAUAAAAAAAAACQAAAFADAAAhAwAAAAAAAAAAAAAAAAAAmgEAAAEA"
	+ "AAAOAAAAAQABAAEAAACeAQAABAAAAHAQBAAAAA4AAAAAAAAAAACiAQAAAQAAAA4AAAAAAAAAAAAA"
	+ "AKYBAAABAAAADgAHAA4ABgAOAAsADgAKAA4AAAAIPGNsaW5pdD4ABjxpbml0PgALQUFBX1BBRERJ"
	+ "TkcAAUoAEExNYWluJFRyYW5zZm9ybTsABkxNYWluOwAiTGRhbHZpay9hbm5vdGF0aW9uL0VuY2xv"
	+ "c2luZ0NsYXNzOwAeTGRhbHZpay9hbm5vdGF0aW9uL0lubmVyQ2xhc3M7ABJMamF2YS9sYW5nL09i"
	+ "amVjdDsACU1haW4uamF2YQAMU0VDUkVUX0FSUkFZAA1TRUNSRVRfTlVNQkVSAAlUcmFuc2Zvcm0A"
	+ "AVYAC2FjY2Vzc0ZsYWdzAANiYXIAA2ZvbwAEbmFtZQAFdmFsdWUAdn5+RDh7ImNvbXBpbGF0aW9u"
	+ "LW1vZGUiOiJkZWJ1ZyIsIm1pbi1hcGkiOjEsInNoYS0xIjoiYTgzNTJmMjU0ODg1MzYyY2NkOGQ5"
	+ "MDlkMzUyOWM2MDA5NGRkODk2ZSIsInZlcnNpb24iOiIxLjYuMjAtZGV2In0AAgMBEhgCAgQCDgQJ"
	+ "ERcMAwAEAAAJAQkBCQCIgATIAgGBgATcAgEJ9AIBCYgDAAAAAAACAAAAEgMAABgDAABEAwAAAAAA"
	+ "AAAAAAAAAAAADwAAAAAAAAABAAAAAAAAAAEAAAAUAAAAcAAAAAIAAAAHAAAAwAAAAAMAAAABAAAA"
	+ "3AAAAAQAAAADAAAA6AAAAAUAAAAFAAAAAAEAAAYAAAABAAAAKAEAAAEgAAAEAAAASAEAAAMgAAAE"
	+ "AAAAmgEAAAIgAAAUAAAArAEAAAQgAAACAAAAEgMAAAAgAAABAAAAIQMAAAMQAAACAAAAQAMAAAYg"
	+ "AAABAAAAUAMAAAAQAAABAAAAYAMAAA==");

	private interface TConsumer<T> {
	public void accept(T t) throws Exception;
	}

	private interface ResetIterator<T> extends Iterator<T> {
	public void reset();
	}

	private static final class BaseResetIter implements ResetIterator<Object[]> {
	private boolean have_next = true;

	public Object[] next() {
	if (have_next) {
	have_next = false;
	return new Object[0];
	} else {
	throw new NoSuchElementException("only one element");
	}
	}

	public boolean hasNext() {
	return have_next;
	}

	public void reset() {
	have_next = true;
	}
	}

	public static void main(String[] args) throws Exception {
	System.loadLibrary(args[0]);
	Redefinition.setTestConfiguration(Redefinition.Config.COMMON_REDEFINE);

	// Get the Unsafe object.
	Field f = Unsafe.class.getDeclaredField("THE_ONE");
	f.setAccessible(true);
	Unsafe u = (Unsafe) f.get(null);

	// Get the offsets into the original Transform class of the fields
	long off_secret_array = genericFieldOffset(Transform.class.getDeclaredField("SECRET_ARRAY"));
	long off_secret_number = genericFieldOffset(Transform.class.getDeclaredField("SECRET_NUMBER"));

	System.out.println("Reading normally.");
	System.out.println("\tOriginal secret number is: " + Transform.SECRET_NUMBER);
	System.out.println("\tOriginal secret array is: " + Arrays.toString((byte[])Transform.SECRET_ARRAY));
	System.out.println("Using unsafe to access values directly from memory.");
	System.out.println(
	"\tOriginal secret number is: " + u.getLong(Transform.class, off_secret_number));
	System.out.println(
	"\tOriginal secret array is: "
	+ Arrays.toString((byte[]) u.getObject(Transform.class, off_secret_array)));

	// Redefine in a way that changes the offsets.
	Redefinition.doCommonStructuralClassRedefinition(Transform.class, REDEFINED_DEX_FILE);

	// Make sure the value is the same.
	System.out.println("Reading normally post redefinition.");
	System.out.println("\tPost-redefinition secret number is: " + Transform.SECRET_NUMBER);
	System.out.println("\tPost-redefinition secret array is: " + Arrays.toString((byte[])Transform.SECRET_ARRAY));

	// Get the (old) obsolete class from the ClassExt
	Field ext_field = Class.class.getDeclaredField("extData");
	ext_field.setAccessible(true);
	Object ext_data = ext_field.get(Transform.class);
	Field oc_field = ext_data.getClass().getDeclaredField("obsoleteClass");
	oc_field.setAccessible(true);
	Class<?> obsolete_class = (Class<?>) oc_field.get(ext_data);

	// Try reading the fields directly out of memory using unsafe.
	System.out.println("Obsolete class is: " + obsolete_class);
	System.out.println("Using unsafe to access obsolete values directly from memory.");
	System.out.println(
	"\tObsolete secret number is: " + u.getLong(obsolete_class, off_secret_number));
	System.out.println(
	"\tObsolete secret array is: "
	+ Arrays.toString((byte[]) u.getObject(obsolete_class, off_secret_array)));

	// Try calling all the public, non-static methods on the obsolete class. Make sure we cannot get
	// j.l.r.{Method,Field} objects or instances.
	TConsumer<Class> cc =
	(Class c) -> {
	for (Method m : Class.class.getDeclaredMethods()) {
	if (Modifier.isPublic(m.getModifiers()) && !Modifier.isStatic(m.getModifiers())) {
	Iterable<Object[]> iter = CollectParameterValues(m, obsolete_class);
	System.out.println("Calling " + m + " with params: " + iter);
	for (Object[] arr : iter) {
	try {
	System.out.println(
	m
	+ " on "
	+ safePrint(c)
	+ " with "
	+ deepPrint(arr)
	+ " = "
	+ safePrint(m.invoke(c, arr)));
	} catch (Throwable e) {
	System.out.println(
	m + " with " + deepPrint(arr) + " throws " + safePrint(e) + ": " + safePrint(e.getCause()));
	}
	}
	}
	}
	};
	System.out.println("\n\nUsing obsolete class object!\n\n");
	cc.accept(obsolete_class);
	System.out.println("\n\nUsing non-obsolete class object!\n\n");
	cc.accept(Transform.class);
	}

	public static Iterable<Object[]> CollectParameterValues(Method m, Class<?> obsolete_class) throws Exception {
	Class<?>[] types = m.getParameterTypes();
	final Object[][] params = new Object[types.length][];
	for (int i = 0; i < types.length; i++) {
	if (types[i].equals(Class.class)) {
	params[i] =
	new Object[] {
	null, Object.class, obsolete_class, Transform.class, Long.TYPE, Class.class
	};
	} else if (types[i].equals(Boolean.TYPE)) {
	params[i] = new Object[] {Boolean.TRUE, Boolean.FALSE};
	} else if (types[i].equals(String.class)) {
	params[i] = new Object[] {"NOT_USED_STRING", "foo", "SECRET_ARRAY"};
	} else if (types[i].equals(Object.class)) {
	params[i] = new Object[] {null, "foo", "NOT_USED_STRING", Transform.class};
	} else if (types[i].isArray()) {
	params[i] = new Object[] {new Object[0], new Class[0], null};
	} else {
	throw new Exception("Unknown type " + types[i] + " at " + i + " in " + m);
	}
	}
	// Build the reset-iter.
	ResetIterator<Object[]> iter = new BaseResetIter();
	for (int i = params.length - 1; i >= 0; i--) {
	iter = new ComboIter(Arrays.asList(params[i]), iter);
	}
	final Iterator<Object[]> fiter = iter;
	// Wrap in an iterator with a useful toString method.
	return new Iterable<Object[]>() {
	public Iterator<Object[]> iterator() { return fiter; }
	public String toString() { return deepPrint(params); }
	};
	}

	public static String deepPrint(Object[] o) {
	return Arrays.toString(
	Arrays.stream(o)
	.map(
	(x) -> {
	if (x == null) {
	return "null";
	} else if (x.getClass().isArray()) {
	if (((Object[]) x).length == 0) {
	return "new " + x.getClass().getComponentType().getName() + "[0]";
	} else {
	return deepPrint((Object[]) x);
	}
	} else {
	return safePrint(x);
	}
	})
	.toArray());
	}

	public static String safePrint(Object o) {
	if (o instanceof ClassLoader) {
	return o.getClass().getName();
	} else if (o == null) {
	return "null";
	} else if (o instanceof Exception) {
	String res = o.toString();
	if (res.endsWith("-transformed)")) {
	res = res.substring(0, res.lastIndexOf(" ")) + " <transformed-jar>)";
	} else if (res.endsWith(".jar)")) {
	res = res.substring(0, res.lastIndexOf(" ")) + " <original-jar>)";
	}
	return res;
	} else if (o instanceof Transform) {
	return "Transform Instance";
	} else if (o instanceof Class && isObsoleteObject((Class) o)) {
	return "(obsolete)" + o.toString();
	} else if (o.getClass().isArray()) {
	return Arrays.toString((Object[])o);
	} else {
	return o.toString();
	}
	}

	private static class ComboIter implements ResetIterator<Object[]> {
	private ResetIterator<Object[]> next;
	private Object cur;
	private boolean first;
	private Iterator<Object> my_vals;
	private Iterable<Object> my_vals_reset;

	public Object[] next() {
	if (!next.hasNext()) {
	cur = my_vals.next();
	first = false;
	if (next != null) {
	next.reset();
	}
	}
	if (first) {
	first = false;
	cur = my_vals.next();
	}
	Object[] nv = next.next();
	Object[] res = new Object[nv.length + 1];
	res[0] = cur;
	for (int i = 0; i < nv.length; i++) {
	res[i + 1] = nv[i];
	}
	return res;
	}

	public boolean hasNext() {
	return next.hasNext() \|\| my_vals.hasNext();
	}

	public void reset() {
	my_vals = my_vals_reset.iterator();
	next.reset();
	cur = null;
	first = true;
	}

	public ComboIter(Iterable<Object> this_reset, ResetIterator<Object[]> next_reset) {
	my_vals_reset = this_reset;
	next = next_reset;
	reset();
	}
	}

	public static native long genericFieldOffset(Field f);

	public static native boolean isObsoleteObject(Class c);
	}