diff -r 83f638b13242 -r d382dacfd73f rt/javap/src/main/java/org/apidesign/javap/TypeArray.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/javap/src/main/java/org/apidesign/javap/TypeArray.java	Tue Feb 26 16:54:16 2013 +0100
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 2012, 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 org.apidesign.javap;
+
+import static org.apidesign.javap.RuntimeConstants.ITEM_Bogus;
+import static org.apidesign.javap.RuntimeConstants.ITEM_Integer;
+import static org.apidesign.javap.RuntimeConstants.ITEM_Float;
+import static org.apidesign.javap.RuntimeConstants.ITEM_Double;
+import static org.apidesign.javap.RuntimeConstants.ITEM_Long;
+import static org.apidesign.javap.RuntimeConstants.ITEM_Null;
+import static org.apidesign.javap.RuntimeConstants.ITEM_InitObject;
+import static org.apidesign.javap.RuntimeConstants.ITEM_Object;
+import static org.apidesign.javap.RuntimeConstants.ITEM_NewObject;
+
+public final class TypeArray {
+    private static final int CAPACITY_INCREMENT = 16;
+
+    private int[] types;
+    private int size;
+
+    public TypeArray() {
+    }
+    
+    public TypeArray(final TypeArray initialTypes) {
+        setAll(initialTypes);
+    }
+
+    public void add(final int newType) {
+        ensureCapacity(size + 1);
+        types[size++] = newType;
+    }
+
+    public void addAll(final TypeArray newTypes) {
+        addAll(newTypes.types, 0, newTypes.size);
+    }
+
+    public void addAll(final int[] newTypes) {
+        addAll(newTypes, 0, newTypes.length);
+    }
+
+    public void addAll(final int[] newTypes,
+                       final int offset,
+                       final int count) {
+        if (count > 0) {
+            ensureCapacity(size + count);
+            arraycopy(newTypes, offset, types, size, count);
+            size += count;
+        }
+    }
+
+    public void set(final int index, final int newType) {
+        types[index] = newType;
+    }
+
+    public void setAll(final TypeArray newTypes) {
+        setAll(newTypes.types, 0, newTypes.size);
+    }
+
+    public void setAll(final int[] newTypes) {
+        setAll(newTypes, 0, newTypes.length);
+    }
+
+    public void setAll(final int[] newTypes,
+                       final int offset,
+                       final int count) {
+        if (count > 0) {
+            ensureCapacity(count);
+            arraycopy(newTypes, offset, types, 0, count);
+            size = count;
+        } else {
+            clear();
+        }
+    }
+
+    public void setSize(final int newSize) {
+        if (size != newSize) {
+            ensureCapacity(newSize);
+
+            for (int i = size; i < newSize; ++i) {
+                types[i] = 0;
+            }
+            size = newSize;
+        }
+    }
+
+    public void clear() {
+        size = 0;
+    }
+
+    public int getSize() {
+        return size;
+    }
+
+    public int get(final int index) {
+        return types[index];
+    }
+
+    public static String typeString(final int type) {
+        switch (type & 0xff) {
+            case ITEM_Bogus:
+                return "_top_";
+            case ITEM_Integer:
+                return "_int_";
+            case ITEM_Float:
+                return "_float_";
+            case ITEM_Double:
+                return "_double_";
+            case ITEM_Long:
+                return "_long_";
+            case ITEM_Null:
+                return "_null_";
+            case ITEM_InitObject: // UninitializedThis
+                return "_init_";
+            case ITEM_Object:
+                return "_object_";
+            case ITEM_NewObject: // Uninitialized
+                return "_new_";
+            default:
+                throw new IllegalArgumentException("Unknown type");
+        }
+    }
+
+    @Override
+    public String toString() {
+        final StringBuilder sb = new StringBuilder("[");
+        if (size > 0) {
+            sb.append(typeString(types[0]));
+            for (int i = 1; i < size; ++i) {
+                sb.append(", ");
+                sb.append(typeString(types[i]));
+            }
+        }
+
+        return sb.append(']').toString();
+    }
+
+    private void ensureCapacity(final int minCapacity) {
+        if ((minCapacity == 0)
+                || (types != null) && (minCapacity <= types.length)) {
+            return;
+        }
+
+        final int newCapacity =
+                ((minCapacity + CAPACITY_INCREMENT - 1) / CAPACITY_INCREMENT)
+                    * CAPACITY_INCREMENT;
+        final int[] newTypes = new int[newCapacity];
+
+        if (size > 0) {
+            arraycopy(types, 0, newTypes, 0, size);
+        }
+
+        types = newTypes;
+    }
+
+    // no System.arraycopy
+    private void arraycopy(final int[] src, final int srcPos,
+                           final int[] dest, final int destPos,
+                           final int length) {
+        for (int i = 0; i < length; ++i) {
+            dest[destPos + i] = src[srcPos + i];
+        }
+    }
+}