--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.ruby.nodes/src/com/oracle/truffle/ruby/nodes/CoreSource.java	Tue Jan 07 18:53:04 2014 +0100
@@ -0,0 +1,72 @@
+/*
+ * 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;
+
+import java.io.*;
+
+import com.oracle.truffle.api.*;
+
+/**
+ * Singleton source used for core method nodes.
+ */
+public final class CoreSource implements Source {
+
+    private final String name;
+
+    public CoreSource(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getCode() {
+        return name;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+
+    public String getPath() {
+        return null;
+    }
+
+    public Reader getReader() {
+        return null;
+    }
+
+    public InputStream getInputStream() {
+        return null;
+    }
+
+    public String getCode(int lineNumber) {
+        return null;
+    }
+
+    public int getLineCount() {
+        return 0;
+    }
+
+    public int getLineNumber(int offset) {
+        return 0;
+    }
+
+    public int getLineStartOffset(int lineNumber) {
+        return 0;
+    }
+
+    public int getLineLength(int lineNumber) {
+        return 0;
+    }
+
+}