--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.runtime/src/com/oracle/truffle/ruby/runtime/core/RubyFixnum.java	Mon Jan 06 17:12:09 2014 +0000
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 1.0
+ * GNU General Public License version 2
+ * GNU Lesser General Public License version 2.1
+ */
+package com.oracle.truffle.ruby.runtime.core;
+
+import java.math.*;
+
+import com.oracle.truffle.ruby.runtime.objects.*;
+
+/**
+ * Represents the Ruby {@code Fixnum} class.
+ */
+public class RubyFixnum extends RubyObject implements Unboxable {
+
+    public static final int MIN_VALUE = Integer.MIN_VALUE;
+    public static final int MAX_VALUE = Integer.MAX_VALUE;
+
+    public static final BigInteger MIN_VALUE_BIG = BigInteger.valueOf(MIN_VALUE);
+    public static final BigInteger MAX_VALUE_BIG = BigInteger.valueOf(MAX_VALUE);
+
+    public static final int SIZE = Integer.SIZE;
+
+    private final int value;
+
+    public RubyFixnum(RubyClass fixnumClass, int value) {
+        super(fixnumClass);
+        this.value = value;
+    }
+
+    public int getValue() {
+        return value;
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(value);
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (other instanceof Integer) {
+            return value == (int) other;
+        } else if (other instanceof RubyFixnum) {
+            return value == ((RubyFixnum) other).value;
+        } else if (other instanceof BigInteger) {
+            return ((BigInteger) other).equals(value);
+        } else if (other instanceof RubyBignum) {
+            return ((RubyBignum) other).getValue().equals(value);
+        } else if (other instanceof Double) {
+            return value == (double) other;
+        } else if (other instanceof RubyFloat) {
+            return value == ((RubyFloat) other).getValue();
+        } else {
+            return super.equals(other);
+        }
+    }
+
+    @Override
+    public int hashCode() {
+        throw new UnsupportedOperationException();
+    }
+
+    public Object unbox() {
+        return value;
+    }
+
+}