--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/call/BooleanDispatchNode.java	Tue Jan 07 18:53:04 2014 +0100
@@ -0,0 +1,96 @@
+/*
+ * 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.nodes.call;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.ruby.nodes.*;
+import com.oracle.truffle.ruby.runtime.*;
+import com.oracle.truffle.ruby.runtime.core.*;
+import com.oracle.truffle.ruby.runtime.methods.*;
+
+/**
+ * An unboxed node in the dispatch chain that dispatches if the node is a boolean. In normal unboxed
+ * dispatch we look at the Java class of the receiver. However, in Ruby true and false are two
+ * separate classes, so in this situation we have to dispatch on the value, as well as the Java
+ * class when we are dealing with booleans.
+ * <p>
+ * TODO(CS): it would be nice if we could {@link RubyNode#executeBoolean} the receiver, but by the
+ * time we get to this dispatch node the receiver is already executed.
+ */
+public class BooleanDispatchNode extends UnboxedDispatchNode {
+
+    private final Assumption falseUnmodifiedAssumption;
+    private final RubyMethod falseMethod;
+
+    private final Assumption trueUnmodifiedAssumption;
+    private final RubyMethod trueMethod;
+
+    @Child protected UnboxedDispatchNode next;
+
+    public BooleanDispatchNode(RubyContext context, SourceSection sourceSection, Assumption falseUnmodifiedAssumption, RubyMethod falseMethod, Assumption trueUnmodifiedAssumption,
+                    RubyMethod trueMethod, UnboxedDispatchNode next) {
+        super(context, sourceSection);
+
+        assert falseUnmodifiedAssumption != null;
+        assert falseMethod != null;
+        assert trueUnmodifiedAssumption != null;
+        assert trueMethod != null;
+
+        this.falseUnmodifiedAssumption = falseUnmodifiedAssumption;
+        this.falseMethod = falseMethod;
+
+        this.trueUnmodifiedAssumption = trueUnmodifiedAssumption;
+        this.trueMethod = trueMethod;
+
+        this.next = adoptChild(next);
+    }
+
+    @Override
+    public Object dispatch(VirtualFrame frame, Object receiverObject, RubyProc blockObject, Object[] argumentsObjects) {
+        // Check it's a boolean
+
+        if (!(receiverObject instanceof Boolean)) {
+            return next.dispatch(frame, receiverObject, blockObject, argumentsObjects);
+        }
+
+        // Check the value
+
+        Assumption unmodifiedAssumption;
+        RubyMethod method;
+
+        if ((boolean) receiverObject) {
+            unmodifiedAssumption = trueUnmodifiedAssumption;
+            method = trueMethod;
+        } else {
+            unmodifiedAssumption = falseUnmodifiedAssumption;
+            method = falseMethod;
+        }
+
+        // Check the class has not been modified
+
+        try {
+            unmodifiedAssumption.check();
+        } catch (InvalidAssumptionException e) {
+            return respecialize("class modified", frame, receiverObject, blockObject, argumentsObjects);
+        }
+
+        // Call the method
+
+        return method.call(frame.pack(), receiverObject, blockObject, argumentsObjects);
+    }
+
+    @Override
+    public void setNext(UnboxedDispatchNode next) {
+        this.next = adoptChild(next);
+    }
+
+}