diff -r 000000000000 -r 3ee23267706c vm/src/main/java/org/apidesign/vm4brwsr/StackToVariableMapper.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/StackToVariableMapper.java	Thu Nov 29 20:19:00 2012 +0100
@@ -0,0 +1,93 @@
+/**
+ * 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.vm4brwsr;
+
+public final class StackToVariableMapper {
+    private static final String VAR_NAME_PREFIX = "stack";
+
+    private int stackSize;
+    private StringBuilder varNameBuilder;
+
+    private int maxStackSize;
+
+    public StackToVariableMapper() {
+        varNameBuilder = new StringBuilder(VAR_NAME_PREFIX);
+    }
+
+    public void reset(final int newStackSize) {
+        stackSize = newStackSize;
+        if (maxStackSize < stackSize) {
+            maxStackSize = stackSize;
+        }
+    }
+
+    public void push(final int numOfElements) {
+        stackSize += numOfElements;
+        if (maxStackSize < stackSize) {
+            maxStackSize = stackSize;
+        }
+    }
+
+    public String push() {
+        push(1);
+        return get(0);
+    }
+
+    public void pop(final int numOfElements) {
+        if (numOfElements > stackSize) {
+            throw new IllegalStateException("Stack underflow");
+        }
+        stackSize -= numOfElements;
+    }
+
+    public String pop() {
+        final String variableName = get(0);
+        pop(1);
+        return variableName;
+    }
+
+    public String get(final int indexFromTop) {
+        if (indexFromTop >= stackSize) {
+            throw new IllegalStateException("Stack underflow");
+        }
+
+        return constructVariableName(stackSize - indexFromTop - 1);
+    }
+
+    public String top() {
+        return get(0);
+    }
+
+    public String bottom() {
+        if (stackSize == 0) {
+            throw new IllegalStateException("Stack underflow");
+        }
+
+        return constructVariableName(0);
+    }
+
+    public int getMaxStackSize() {
+        return maxStackSize;
+    }
+
+    public String constructVariableName(final int index) {
+        varNameBuilder.setLength(VAR_NAME_PREFIX.length());
+        varNameBuilder.append(index);
+        return varNameBuilder.toString();
+    }
+}