diff -r 000000000000 -r 3ee23267706c javap/src/main/java/org/apidesign/javap/StackMapIterator.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/javap/src/main/java/org/apidesign/javap/StackMapIterator.java	Thu Nov 29 20:19:00 2012 +0100
@@ -0,0 +1,94 @@
+/*
+ * 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;
+
+public final class StackMapIterator {
+    private static final StackMapTableData INITIAL_FRAME =
+            new StackMapTableData(-1) {
+                @Override
+                int getStackItemsCount() {
+                    return 0;
+                }
+
+                @Override
+                public String toString() {
+                    return "INITIAL(0)";
+                }
+            };
+
+    private final StackMapTableData[] stackMapTable;
+
+    private int nextFrameIndex;
+    private int lastFrameByteCodeOffset;
+
+    private int byteCodeOffset;
+
+    StackMapIterator(final StackMapTableData[] stackMapTable) {
+        this.stackMapTable = (stackMapTable != null)
+                                 ? stackMapTable
+                                 : new StackMapTableData[0];
+        this.lastFrameByteCodeOffset = -1;
+        advanceBy(0);
+    }
+
+    public String getFrameAsString() {
+        return getCurrentFrame().toString();
+    }
+
+    public int getFrameIndex() {
+        return nextFrameIndex;
+    }
+
+    public int getFrameStackItemsCount() {
+        return getCurrentFrame().getStackItemsCount();
+    }
+
+    public void advanceBy(final int numByteCodes) {
+        if (numByteCodes < 0) {
+            throw new IllegalStateException("Forward only iterator");
+        }
+
+        byteCodeOffset += numByteCodes;
+        while ((nextFrameIndex < stackMapTable.length)
+                    && ((byteCodeOffset - lastFrameByteCodeOffset)
+                            >= (stackMapTable[nextFrameIndex].offsetDelta
+                                    + 1))) {
+            lastFrameByteCodeOffset +=
+                    stackMapTable[nextFrameIndex].offsetDelta + 1;
+            ++nextFrameIndex;
+        }
+    }
+
+    public void advanceTo(final int nextByteCodeOffset) {
+        advanceBy(nextByteCodeOffset - byteCodeOffset);
+    }
+
+    private StackMapTableData getCurrentFrame() {
+        return (nextFrameIndex == 0)
+                ? INITIAL_FRAME
+                : stackMapTable[nextFrameIndex - 1];
+    }
+}