--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.sl/src/com/oracle/truffle/sl/nodes/access/SLWritePropertyNode.java	Tue Nov 18 23:02:58 2014 +0100
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2013, 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.
+ *
+ * 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.sl.nodes.access;
+
+import java.util.*;
+
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.api.source.*;
+import com.oracle.truffle.sl.*;
+import com.oracle.truffle.sl.nodes.*;
+
+/**
+ * The node for setting a property of an object. When executed, this node first evaluates the value
+ * expression on the right hand side of the equals operator, followed by the object expression on
+ * the left side of the dot operator, and then sets the named property of this object to the new
+ * value if the property already exists or adds a new property. Finally, it returns the new value.
+ */
+@NodeInfo(shortName = ".=")
+public final class SLWritePropertyNode extends SLExpressionNode {
+
+    public static SLWritePropertyNode create(SourceSection src, SLExpressionNode receiverNode, String propertyName, SLExpressionNode valueNode) {
+        return new SLWritePropertyNode(src, receiverNode, propertyName, valueNode);
+    }
+
+    @Child protected SLExpressionNode receiverNode;
+    protected final String propertyName;
+    @Child protected SLExpressionNode valueNode;
+
+    private SLWritePropertyNode(SourceSection src, SLExpressionNode receiverNode, String propertyName, SLExpressionNode valueNode) {
+        super(src);
+        this.receiverNode = receiverNode;
+        this.propertyName = propertyName;
+        this.valueNode = valueNode;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public Object executeGeneric(VirtualFrame frame) {
+        Object value = valueNode.executeGeneric(frame);
+        Object object = receiverNode.executeGeneric(frame);
+        if (object instanceof Map) {
+            ((Map<Object, Object>) object).put(propertyName, value);
+        } else {
+            throw new SLException("unexpected receiver type");
+        }
+        return value;
+    }
+}