# HG changeset patch
# User Jaroslav Tulach <jaroslav.tulach@apidesign.org>
# Date 1358543821 -3600
# Node ID ec5db753921931c7969086aefe8c4c999505d080
# Parent  a2871a3fd4c5e0450ee50cdb7e507721fa4d9d65# Parent  947269b26dc0404c971f1b98cda041ae54daa758
Giving everyone the benefits of java.lang.reflect.Array

diff -r a2871a3fd4c5 -r ec5db7539219 emul/src/main/java/java/lang/NegativeArraySizeException.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emul/src/main/java/java/lang/NegativeArraySizeException.java	Fri Jan 18 22:17:01 2013 +0100
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 1994, 2008, 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.
+ */
+
+package java.lang;
+
+/**
+ * Thrown if an application tries to create an array with negative size.
+ *
+ * @author  unascribed
+ * @since   JDK1.0
+ */
+public
+class NegativeArraySizeException extends RuntimeException {
+    private static final long serialVersionUID = -8960118058596991861L;
+
+    /**
+     * Constructs a <code>NegativeArraySizeException</code> with no
+     * detail message.
+     */
+    public NegativeArraySizeException() {
+        super();
+    }
+
+    /**
+     * Constructs a <code>NegativeArraySizeException</code> with the
+     * specified detail message.
+     *
+     * @param   s   the detail message.
+     */
+    public NegativeArraySizeException(String s) {
+        super(s);
+    }
+}
diff -r a2871a3fd4c5 -r ec5db7539219 emul/src/main/java/java/lang/Object.java
--- a/emul/src/main/java/java/lang/Object.java	Tue Jan 15 12:44:33 2013 +0100
+++ b/emul/src/main/java/java/lang/Object.java	Fri Jan 18 22:17:01 2013 +0100
@@ -25,6 +25,7 @@
 
 package java.lang;
 
+import java.lang.reflect.Array;
 import org.apidesign.bck2brwsr.core.JavaScriptBody;
 import org.apidesign.bck2brwsr.core.JavaScriptPrototype;
 
@@ -40,8 +41,13 @@
 @JavaScriptPrototype(container = "Object.prototype", prototype = "new Object")
 public class Object {
 
-    @JavaScriptBody(args = {}, body = "")
-    private static native void registerNatives();
+    private static void registerNatives() {
+        try {
+            Array.get(null, 0);
+        } catch (Throwable ex) {
+            // ignore
+        }
+    }
     static {
         registerNatives();
     }
diff -r a2871a3fd4c5 -r ec5db7539219 emul/src/main/java/java/lang/reflect/Array.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emul/src/main/java/java/lang/reflect/Array.java	Fri Jan 18 22:17:01 2013 +0100
@@ -0,0 +1,659 @@
+/*
+ * Copyright (c) 1996, 2006, 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.
+ */
+
+package java.lang.reflect;
+
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+import org.apidesign.bck2brwsr.core.JavaScriptPrototype;
+
+/**
+ * The {@code Array} class provides static methods to dynamically create and
+ * access Java arrays.
+ *
+ * <p>{@code Array} permits widening conversions to occur during a get or set
+ * operation, but throws an {@code IllegalArgumentException} if a narrowing
+ * conversion would occur.
+ *
+ * @author Nakul Saraiya
+ */
+@JavaScriptPrototype(prototype = "new Array", container = "Array.prototype")
+public final
+class Array {
+
+    /**
+     * Constructor.  Class Array is not instantiable.
+     */
+    private Array() {}
+
+    /**
+     * Creates a new array with the specified component type and
+     * length.
+     * Invoking this method is equivalent to creating an array
+     * as follows:
+     * <blockquote>
+     * <pre>
+     * int[] x = {length};
+     * Array.newInstance(componentType, x);
+     * </pre>
+     * </blockquote>
+     *
+     * @param componentType the {@code Class} object representing the
+     * component type of the new array
+     * @param length the length of the new array
+     * @return the new array
+     * @exception NullPointerException if the specified
+     * {@code componentType} parameter is null
+     * @exception IllegalArgumentException if componentType is {@link Void#TYPE}
+     * @exception NegativeArraySizeException if the specified {@code length}
+     * is negative
+     */
+    public static Object newInstance(Class<?> componentType, int length)
+    throws NegativeArraySizeException {
+        if (length < 0) {
+            throw new NegativeArraySizeException();
+        }
+        String sig = findSignature(componentType);
+        return newArray(componentType.isPrimitive(), sig, length);
+    }
+    
+    private static String findSignature(Class<?> type) {
+        if (type == Integer.TYPE) {
+            return "[I";
+        }
+        if (type == Long.TYPE) {
+            return "[J";
+        }
+        if (type == Double.TYPE) {
+            return "[D";
+        }
+        if (type == Float.TYPE) {
+            return "[F";
+        }
+        if (type == Byte.TYPE) {
+            return "[B";
+        }
+        if (type == Boolean.TYPE) {
+            return "[Z";
+        }
+        if (type == Short.TYPE) {
+            return "[S";
+        }
+        if (type == Character.TYPE) {
+            return "[C";
+        }
+        if (type.getName().equals("void")) {
+            throw new IllegalStateException("Can't create array for " + type);
+        }
+        return "[L" + type.getName() + ";";
+    }
+    /**
+     * Creates a new array
+     * with the specified component type and dimensions.
+     * If {@code componentType}
+     * represents a non-array class or interface, the new array
+     * has {@code dimensions.length} dimensions and
+     * {@code componentType} as its component type. If
+     * {@code componentType} represents an array class, the
+     * number of dimensions of the new array is equal to the sum
+     * of {@code dimensions.length} and the number of
+     * dimensions of {@code componentType}. In this case, the
+     * component type of the new array is the component type of
+     * {@code componentType}.
+     *
+     * <p>The number of dimensions of the new array must not
+     * exceed the number of array dimensions supported by the
+     * implementation (typically 255).
+     *
+     * @param componentType the {@code Class} object representing the component
+     * type of the new array
+     * @param dimensions an array of {@code int} representing the dimensions of
+     * the new array
+     * @return the new array
+     * @exception NullPointerException if the specified
+     * {@code componentType} argument is null
+     * @exception IllegalArgumentException if the specified {@code dimensions}
+     * argument is a zero-dimensional array, or if the number of
+     * requested dimensions exceeds the limit on the number of array dimensions
+     * supported by the implementation (typically 255), or if componentType
+     * is {@link Void#TYPE}.
+     * @exception NegativeArraySizeException if any of the components in
+     * the specified {@code dimensions} argument is negative.
+     */
+    public static Object newInstance(Class<?> componentType, int... dimensions)
+        throws IllegalArgumentException, NegativeArraySizeException {
+        StringBuilder sig = new StringBuilder();
+        for (int i = 1; i < dimensions.length; i++) {
+            sig.append('[');
+        }
+        sig.append(findSignature(componentType));
+        return multiNewArray(sig.toString(), dimensions, 0);
+    }
+
+    /**
+     * Returns the length of the specified array object, as an {@code int}.
+     *
+     * @param array the array
+     * @return the length of the array
+     * @exception IllegalArgumentException if the object argument is not
+     * an array
+     */
+    public static int getLength(Object array)
+    throws IllegalArgumentException {
+        if (!array.getClass().isArray()) {
+            throw new IllegalArgumentException("Argument is not an array");
+        }
+        return length(array);
+    }
+    
+    @JavaScriptBody(args = { "arr" }, body = "return arr.length;")
+    private static native int length(Object arr);
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object.  The value is automatically wrapped in an object
+     * if it has a primitive type.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the (possibly wrapped) value of the indexed component in
+     * the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     */
+    public static Object get(Object array, int index)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        final Class<?> t = array.getClass().getComponentType();
+        if (t.isPrimitive()) {
+            return Array.fromPrimitive(t, array, index);
+        } else {
+            return ((Object[])array)[index];
+        }
+    }
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object, as a {@code boolean}.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the value of the indexed component in the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array, or if the indexed element cannot be converted to the
+     * return type by an identity or widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     * @see Array#get
+     */
+    public static native boolean getBoolean(Object array, int index)
+        throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object, as a {@code byte}.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the value of the indexed component in the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array, or if the indexed element cannot be converted to the
+     * return type by an identity or widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     * @see Array#get
+     */
+    public static byte getByte(Object array, int index)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        if (array.getClass().getComponentType() != Byte.TYPE) {
+            throw new IllegalArgumentException();
+        }
+        byte[] arr = (byte[]) array;
+        return arr[index];
+    }
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object, as a {@code char}.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the value of the indexed component in the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array, or if the indexed element cannot be converted to the
+     * return type by an identity or widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     * @see Array#get
+     */
+    public static native char getChar(Object array, int index)
+        throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object, as a {@code short}.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the value of the indexed component in the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array, or if the indexed element cannot be converted to the
+     * return type by an identity or widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     * @see Array#get
+     */
+    public static short getShort(Object array, int index)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        final Class<?> t = array.getClass().getComponentType();
+        if (t == Short.TYPE) {
+            short[] arr = (short[]) array;
+            return arr[index];
+        }
+        return getByte(array, index);
+    }
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object, as an {@code int}.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the value of the indexed component in the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array, or if the indexed element cannot be converted to the
+     * return type by an identity or widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     * @see Array#get
+     */
+    public static int getInt(Object array, int index) 
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        final Class<?> t = array.getClass().getComponentType();
+        if (t == Integer.TYPE) {
+            int[] arr = (int[]) array;
+            return arr[index];
+        }
+        return getShort(array, index);
+    }
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object, as a {@code long}.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the value of the indexed component in the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array, or if the indexed element cannot be converted to the
+     * return type by an identity or widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     * @see Array#get
+     */
+    public static long getLong(Object array, int index)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        final Class<?> t = array.getClass().getComponentType();
+        if (t == Long.TYPE) {
+            long[] arr = (long[]) array;
+            return arr[index];
+        }
+        return getInt(array, index);
+    }
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object, as a {@code float}.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the value of the indexed component in the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array, or if the indexed element cannot be converted to the
+     * return type by an identity or widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     * @see Array#get
+     */
+    public static float getFloat(Object array, int index)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        final Class<?> t = array.getClass().getComponentType();
+        if (t == Float.TYPE) {
+            float[] arr = (float[]) array;
+            return arr[index];
+        }
+        return getLong(array, index);
+    }
+
+    /**
+     * Returns the value of the indexed component in the specified
+     * array object, as a {@code double}.
+     *
+     * @param array the array
+     * @param index the index
+     * @return the value of the indexed component in the specified array
+     * @exception NullPointerException If the specified object is null
+     * @exception IllegalArgumentException If the specified object is not
+     * an array, or if the indexed element cannot be converted to the
+     * return type by an identity or widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to the
+     * length of the specified array
+     * @see Array#get
+     */
+    public static double getDouble(Object array, int index)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        final Class<?> t = array.getClass().getComponentType();
+        if (t == Double.TYPE) {
+            double[] arr = (double[]) array;
+            return arr[index];
+        }
+        return getFloat(array, index);
+    }
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified new value.  The new value is first
+     * automatically unwrapped if the array has a primitive component
+     * type.
+     * @param array the array
+     * @param index the index into the array
+     * @param value the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the array component type is primitive and
+     * an unwrapping conversion fails
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     */
+    public static void set(Object array, int index, Object value)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        if (array.getClass().getComponentType().isPrimitive()) {
+            throw new IllegalArgumentException();
+        } else {
+            Object[] arr = (Object[])array;
+            arr[index] = value;
+        }
+    }
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified {@code boolean} value.
+     * @param array the array
+     * @param index the index into the array
+     * @param z the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the specified value cannot be converted
+     * to the underlying array's component type by an identity or a
+     * primitive widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     * @see Array#set
+     */
+    public static native void setBoolean(Object array, int index, boolean z)
+        throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified {@code byte} value.
+     * @param array the array
+     * @param index the index into the array
+     * @param b the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the specified value cannot be converted
+     * to the underlying array's component type by an identity or a
+     * primitive widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     * @see Array#set
+     */
+    public static void setByte(Object array, int index, byte b)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        Class<?> t = array.getClass().getComponentType();
+        if (t == Byte.TYPE) {
+            byte[] arr = (byte[]) array;
+            arr[index] = b;
+        } else {
+            setShort(array, index, b);
+        }
+    }
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified {@code char} value.
+     * @param array the array
+     * @param index the index into the array
+     * @param c the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the specified value cannot be converted
+     * to the underlying array's component type by an identity or a
+     * primitive widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     * @see Array#set
+     */
+    public static native void setChar(Object array, int index, char c)
+        throws IllegalArgumentException, ArrayIndexOutOfBoundsException;
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified {@code short} value.
+     * @param array the array
+     * @param index the index into the array
+     * @param s the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the specified value cannot be converted
+     * to the underlying array's component type by an identity or a
+     * primitive widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     * @see Array#set
+     */
+    public static void setShort(Object array, int index, short s)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        Class<?> t = array.getClass().getComponentType();
+        if (t == Short.TYPE) {
+            short[] arr = (short[]) array;
+            arr[index] = s;
+        } else {
+            setInt(array, index, s);
+        }
+        
+    }
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified {@code int} value.
+     * @param array the array
+     * @param index the index into the array
+     * @param i the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the specified value cannot be converted
+     * to the underlying array's component type by an identity or a
+     * primitive widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     * @see Array#set
+     */
+    public static void setInt(Object array, int index, int i)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        Class<?> t = array.getClass().getComponentType();
+        if (t == Integer.TYPE) {
+            long[] arr = (long[]) array;
+            arr[index] = i;
+        } else {
+            setLong(array, index, i);
+        }
+    }
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified {@code long} value.
+     * @param array the array
+     * @param index the index into the array
+     * @param l the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the specified value cannot be converted
+     * to the underlying array's component type by an identity or a
+     * primitive widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     * @see Array#set
+     */
+    public static void setLong(Object array, int index, long l)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        Class<?> t = array.getClass().getComponentType();
+        if (t == Long.TYPE) {
+            long[] arr = (long[]) array;
+            arr[index] = l;
+        } else {
+            setFloat(array, index, l);
+        }
+    }
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified {@code float} value.
+     * @param array the array
+     * @param index the index into the array
+     * @param f the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the specified value cannot be converted
+     * to the underlying array's component type by an identity or a
+     * primitive widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     * @see Array#set
+     */
+    public static void setFloat(Object array, int index, float f)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        Class<?> t = array.getClass().getComponentType();
+        if (t == Float.TYPE) {
+            float[] arr = (float[])array;
+            arr[index] = f;
+        } else {
+            setDouble(array, index, f);
+        }
+    }
+
+    /**
+     * Sets the value of the indexed component of the specified array
+     * object to the specified {@code double} value.
+     * @param array the array
+     * @param index the index into the array
+     * @param d the new value of the indexed component
+     * @exception NullPointerException If the specified object argument
+     * is null
+     * @exception IllegalArgumentException If the specified object argument
+     * is not an array, or if the specified value cannot be converted
+     * to the underlying array's component type by an identity or a
+     * primitive widening conversion
+     * @exception ArrayIndexOutOfBoundsException If the specified {@code index}
+     * argument is negative, or if it is greater than or equal to
+     * the length of the specified array
+     * @see Array#set
+     */
+    public static void setDouble(Object array, int index, double d)
+    throws IllegalArgumentException, ArrayIndexOutOfBoundsException {
+        Class<?> t = array.getClass().getComponentType();
+        if (t == Double.TYPE) {
+            double[] arr = (double[])array;
+            arr[index] = d;
+        } else {
+            throw new IllegalArgumentException("argument type mismatch");
+        }
+    }
+
+    /*
+     * Private
+     */
+
+    @JavaScriptBody(args = { "primitive", "sig", "length" }, body =
+          "var arr = new Array(length);\n"
+        + "var value = primitive ? 0 : null;\n"
+        + "for(var i = 0; i < length; i++) arr[i] = value;\n"
+        + "arr.jvmName = sig;\n"
+        + "return arr;"
+    )
+    private static native Object newArray(boolean primitive, String sig, int length);
+
+    private static Object multiNewArray(String sig, int[] dims, int index)
+    throws IllegalArgumentException, NegativeArraySizeException {
+        if (dims.length == index + 1) {
+            return newArray(sig.length() == 2, sig, dims[index]);
+        }
+        Object[] arr = (Object[]) newArray(false, sig, dims[index]);
+        String compsig = sig.substring(1);
+        for (int i = 0; i < arr.length; i++) {
+            arr[i] = multiNewArray(compsig, dims, index + 1);
+        }
+        return arr;
+    }
+    private static Object fromPrimitive(Class<?> t, Object array, int index) {
+        return Method.fromPrimitive(t, atArray(array, index));
+    }
+    
+    @JavaScriptBody(args = { "array", "index" }, body = "return array[index]")
+    private static native Object atArray(Object array, int index);
+}
diff -r a2871a3fd4c5 -r ec5db7539219 emul/src/main/java/java/lang/reflect/Method.java
--- a/emul/src/main/java/java/lang/reflect/Method.java	Tue Jan 15 12:44:33 2013 +0100
+++ b/emul/src/main/java/java/lang/reflect/Method.java	Fri Jan 18 22:17:01 2013 +0100
@@ -537,7 +537,7 @@
     )
     private static native Object invoke0(boolean isStatic, Method m, Object self, Object[] args);
 
-    private static Object fromPrimitive(Class<?> type, Object o) {
+    static Object fromPrimitive(Class<?> type, Object o) {
         if (type == Integer.TYPE) {
             return fromRaw(Integer.class, "valueOf__Ljava_lang_Integer_2I", o);
         }
diff -r a2871a3fd4c5 -r ec5db7539219 emul/src/main/resources/org/apidesign/vm4brwsr/emul/java_lang_String.js
--- a/emul/src/main/resources/org/apidesign/vm4brwsr/emul/java_lang_String.js	Tue Jan 15 12:44:33 2013 +0100
+++ b/emul/src/main/resources/org/apidesign/vm4brwsr/emul/java_lang_String.js	Fri Jan 18 22:17:01 2013 +0100
@@ -1,12 +1,7 @@
-// initialize methods on String constants
+// initialize methods on arrays and String constants
+vm.java_lang_reflect_Array(false);
 vm.java_lang_String(false);
 
-// we need initialized arrays
-Array.prototype.initWith = function(sig, value) {
-  for(var i = 0; i < this.length; i++) this[i] = value;
-  this.jvmName = sig;
-  return this;
-};
 Array.prototype.at = function(indx, value) {
   if (indx < 0 || indx > this.length) {
       var e = vm.java_lang_ArrayIndexOutOfBoundsException(true);
diff -r a2871a3fd4c5 -r ec5db7539219 vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Tue Jan 15 12:44:33 2013 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Fri Jan 18 22:17:01 2013 +0100
@@ -926,7 +926,7 @@
                         case 11: jvmType = "[J"; break;
                         default: throw new IllegalStateException("Array type: " + atype);
                     }
-                    emit(out, "@2 = new Array(@1).initWith('@3', 0);",
+                    emit(out, "@2 = Array.prototype.newArray__Ljava_lang_Object_2ZLjava_lang_String_2I(true, '@3', @1);",
                          smapper.popI(), smapper.pushA(), jvmType);
                     break;
                 case opc_anewarray: {
@@ -938,7 +938,7 @@
                     } else {
                         typeName = "[L" + typeName + ";";
                     }
-                    emit(out, "@2 = new Array(@1).initWith('@3', null);",
+                    emit(out, "@2 = Array.prototype.newArray__Ljava_lang_Object_2ZLjava_lang_String_2I(false, '@3', @1);",
                          smapper.popI(), smapper.pushA(), typeName);
                     break;
                 }
@@ -947,26 +947,17 @@
                     i += 2;
                     String typeName = jc.getClassName(type);
                     int dim = readByte(byteCodes, ++i);
-                    out.append("{ var a0 = new Array(").append(smapper.popI())
-                       .append(").initWith('").append(typeName).append("', null);");
-                    for (int d = 1; d < dim; d++) {
-                        typeName = typeName.substring(1);
-                        out.append("\n  var l" + d).append(" = ")
-                           .append(smapper.popI()).append(';');
-                        out.append("\n  for (var i" + d).append (" = 0; i" + d).
-                            append(" < a" + (d - 1)).
-                            append(".length; i" + d).append("++) {");
-                        out.append("\n    var a" + d).
-                            append (" = new Array(l" + d).append(").initWith('")
-                            .append(typeName).append("', ")
-                            .append(typeName.length() == 2 ? "0" : "null").append(");");
-                        out.append("\n    a" + (d - 1)).append("[i" + d).append("] = a" + d).
-                            append(";");
+                    StringBuilder dims = new StringBuilder();
+                    dims.append('[');
+                    for (int d = 0; d < dim; d++) {
+                        if (d != 0) {
+                            dims.append(",");
+                        }
+                        dims.append(smapper.popI());
                     }
-                    for (int d = 1; d < dim; d++) {
-                        out.append("\n  }");
-                    }
-                    out.append("\n").append(smapper.pushA()).append(" = a0; }");
+                    dims.append(']');
+                    emit(out, "@2 = Array.prototype.multiNewArray__Ljava_lang_Object_2Ljava_lang_String_2_3II('@3', @1, 0);",
+                         dims.toString(), smapper.pushA(), typeName);
                     break;
                 }
                 case opc_arraylength:
diff -r a2871a3fd4c5 -r ec5db7539219 vmtest/src/test/java/org/apidesign/bck2brwsr/tck/ReflectionArrayTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vmtest/src/test/java/org/apidesign/bck2brwsr/tck/ReflectionArrayTest.java	Fri Jan 18 22:17:01 2013 +0100
@@ -0,0 +1,135 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.bck2brwsr.tck;
+
+import java.lang.reflect.Array;
+import org.apidesign.bck2brwsr.vmtest.Compare;
+import org.apidesign.bck2brwsr.vmtest.VMTest;
+import org.testng.annotations.Factory;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public class ReflectionArrayTest {
+    @Compare public int lengthOfStringArray() {
+        String[] arr = (String[]) Array.newInstance(String.class, 10);
+        return arr.length;
+    }
+    
+    @Compare public int reflectiveLengthOfStringArray() {
+        Object arr = Array.newInstance(String.class, 10);
+        return Array.getLength(arr);
+    }
+
+    @Compare public int reflectiveLengthOneNonArray() {
+        Object arr = "non-array";
+        return Array.getLength(arr);
+    }
+
+    @Compare public String compTypeOfStringArray() {
+        String[] arr = (String[]) Array.newInstance(String.class, 10);
+        return arr.getClass().getComponentType().getName();
+    }
+
+    @Compare public Object negativeArrayExcp() {
+        return Array.newInstance(String.class, -5);
+    }
+    
+    @Compare public int lengthOfIntArray() {
+        int[] arr = (int[]) Array.newInstance(Integer.TYPE, 10);
+        return arr.length;
+    }
+
+    @Compare public int reflectiveLengthOfIntArray() {
+        Object arr = Array.newInstance(Integer.TYPE, 10);
+        return Array.getLength(arr);
+    }
+
+    @Compare public String compTypeOfIntArray() {
+        int[] arr = (int[]) Array.newInstance(int.class, 10);
+        return arr.getClass().getComponentType().getName();
+    }
+
+    @Compare public Object intNegativeArrayExcp() {
+        return Array.newInstance(int.class, -5);
+    }
+
+    @Compare public Integer verifyAutobox() {
+        int[] arr = (int[]) Array.newInstance(int.class, 5);
+        return (Integer) Array.get(arr, 0);
+    }
+    @Compare public String verifyObjectArray() {
+        String[] arr = (String[]) Array.newInstance(String.class, 5);
+        Array.set(arr, 0, "Hello");
+        return (String) Array.get(arr, 0);
+    }
+    @Compare public int verifyInt() {
+        int[] arr = (int[]) Array.newInstance(int.class, 5);
+        return Array.getInt(arr, 0);
+    }
+    @Compare public long verifyConvertToLong() {
+        int[] arr = (int[]) Array.newInstance(int.class, 5);
+        return Array.getLong(arr, 0);
+    }
+
+    @Compare public Object verifySetIntToObject() {
+        try {
+            Object[] arr = (Object[]) Array.newInstance(Object.class, 5);
+            Array.setInt(arr, 0, 10);
+            return Array.get(arr, 0);
+        } catch (Exception exception) {
+            return exception.getClass().getName();
+        }
+    }
+    @Compare public long verifySetShort() {
+        int[] arr = (int[]) Array.newInstance(int.class, 5);
+        Array.setShort(arr, 0, (short)10);
+        return Array.getLong(arr, 0);
+    }
+    @Compare public long verifyCantSetLong() {
+        int[] arr = (int[]) Array.newInstance(int.class, 5);
+        Array.setLong(arr, 0, 10);
+        return Array.getLong(arr, 0);
+    }
+    @Compare public float verifyLongToFloat() {
+        Object arr = Array.newInstance(float.class, 5);
+        Array.setLong(arr, 0, 10);
+        return Array.getFloat(arr, 0);
+    }
+
+    @Compare public double verifyConvertToDouble() {
+        int[] arr = (int[]) Array.newInstance(int.class, 5);
+        return Array.getDouble(arr, 0);
+    }
+    
+    @Compare public int multiIntArray() {
+        int[][][] arr = (int[][][]) Array.newInstance(int.class, 3, 3, 3);
+        return arr[0][1][2] + 5 + arr[2][2][0];
+    }
+
+    @Compare public String multiIntArrayCompType() {
+        return Array.newInstance(int.class, 3, 3, 3).getClass().getName();
+    }
+    
+    
+    @Factory
+    public static Object[] create() {
+        return VMTest.create(ReflectionArrayTest.class);
+    }
+}