--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/source/NullSourceSection.java	Fri Jun 06 22:13:00 2014 -0700
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2014, 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 com.oracle.truffle.api.source;
+
+/**
+ * A special subtype of {@link SourceSection} that represents unavailable source, e.g. for language
+ * <em>builtins</em>.
+ */
+public class NullSourceSection implements SourceSection {
+
+    private final String kind;
+    private final String name;
+    private final String asCode;
+
+    /**
+     * Placeholder for source that is unavailable, e.g. for language <em>builtins</em>.
+     *
+     * @param kind the general category, e.g. "JS builtin"
+     * @param name specific name for this section
+     */
+    public NullSourceSection(String kind, String name) {
+        this(kind, name, kind);
+    }
+
+    /**
+     * Placeholder for source that is unavailable, e.g. for language <em>builtins</em>.
+     *
+     * @param kind the general category, e.g. "JS builtin"
+     * @param name specific name for this section
+     * @param asCode string to return when {@link #getCode()} is called
+     */
+    public NullSourceSection(String kind, String name, String asCode) {
+        this.kind = kind;
+        this.name = name;
+        this.asCode = asCode;
+    }
+
+    public final Source getSource() {
+        return null;
+    }
+
+    public final int getStartLine() {
+        throw new UnsupportedOperationException(this.toString());
+    }
+
+    public final LineLocation getLineLocation() {
+        throw new UnsupportedOperationException(this.toString());
+    }
+
+    public final int getStartColumn() {
+        throw new UnsupportedOperationException(this.toString());
+    }
+
+    public final int getCharIndex() {
+        throw new UnsupportedOperationException(this.toString());
+    }
+
+    public final int getCharLength() {
+        throw new UnsupportedOperationException(this.toString());
+    }
+
+    public final int getCharEndIndex() {
+        throw new UnsupportedOperationException(this.toString());
+    }
+
+    public final String getIdentifier() {
+        return name;
+    }
+
+    public final String getCode() {
+        return asCode;
+    }
+
+    public final String getShortDescription() {
+        return kind + ": " + name;
+    }
+
+    @Override
+    public String toString() {
+        return getShortDescription();
+    }
+
+}