diff --git a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/MessagesForVariablesVM.java b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/MessagesForVariablesVM.java
index 14442ecf7b1..0b0ab78b489 100644
--- a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/MessagesForVariablesVM.java
+++ b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/MessagesForVariablesVM.java
@@ -22,10 +22,10 @@ public class MessagesForVariablesVM extends NLS {
     public static String VariableColumnPresentation_name;
     public static String VariableColumnPresentation_type;
     public static String VariableColumnPresentation_value;
-    public static String VariableColumnPresentation_address;
+    public static String VariableColumnPresentation_location;
 
-    public static String VariableVMNode_Address_column__Error__text_format;
-    public static String VariableVMNode_Address_column__text_format;
+    public static String VariableVMNode_Location_column__Error__text_format;
+    public static String VariableVMNode_Location_column__text_format;
     public static String VariableVMNode_Description_column__text_format;
     public static String VariableVMNode_Expression_column__text_format;
     public static String VariableVMNode_Name_column__text_format;
diff --git a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/VariableColumnPresentation.java b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/VariableColumnPresentation.java
index fb208f38f86..30ad94afcc3 100644
--- a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/VariableColumnPresentation.java
+++ b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/VariableColumnPresentation.java
@@ -42,7 +42,7 @@ public class VariableColumnPresentation implements IColumnPresentation {
         } else if (IDebugVMConstants.COLUMN_ID__VALUE.equals(id)) {
             return MessagesForVariablesVM.VariableColumnPresentation_value;
         } else if (IDebugVMConstants.COLUMN_ID__ADDRESS.equals(id)) {
-        	return MessagesForVariablesVM.VariableColumnPresentation_address;
+        	return MessagesForVariablesVM.VariableColumnPresentation_location;
         } 
         return null;
     }
diff --git a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/VariableVMNode.java b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/VariableVMNode.java
index 2ee2f2ef28e..dd7964f64a8 100644
--- a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/VariableVMNode.java
+++ b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/VariableVMNode.java
@@ -17,7 +17,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.RejectedExecutionException;
 
-import org.eclipse.cdt.core.IAddress;
 import org.eclipse.cdt.debug.internal.ui.CDebugImages;
 import org.eclipse.cdt.dsf.concurrent.ConfinedToDsfExecutor;
 import org.eclipse.cdt.dsf.concurrent.CountingRequestMonitor;
@@ -36,6 +35,7 @@ import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionChangedDMEvent;
 import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionDMAddress;
 import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionDMContext;
 import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionDMData;
+import org.eclipse.cdt.dsf.debug.service.IExpressions.IExpressionDMLocation;
 import org.eclipse.cdt.dsf.debug.service.IMemory.IMemoryChangedEvent;
 import org.eclipse.cdt.dsf.debug.service.IRunControl.ISuspendedDMEvent;
 import org.eclipse.cdt.dsf.debug.service.IStack.IFrameDMContext;
@@ -132,7 +132,7 @@ public class VariableVMNode extends AbstractExpressionVMNode
      *  
      * @since 2.0
      */    
-    private IElementLabelProvider fLabelProvider;
+    private final IElementLabelProvider fLabelProvider;
 
     public class VariableExpressionVMC extends DMVMContext implements IFormattedValueVMContext  {
         
@@ -375,9 +375,9 @@ public class VariableVMNode extends AbstractExpressionVMNode
             IDebugVMConstants.COLUMN_ID__ADDRESS,
             new LabelColumnInfo(new LabelAttribute[] { 
                 new LabelText(
-                    MessagesForVariablesVM.VariableVMNode_Address_column__text_format, 
+                    MessagesForVariablesVM.VariableVMNode_Location_column__text_format, 
                     new String[] { PROP_VARIABLE_ADDRESS }),
-                new LabelText(MessagesForVariablesVM.VariableVMNode_Address_column__Error__text_format, new String[] {}), 
+                new LabelText(MessagesForVariablesVM.VariableVMNode_Location_column__Error__text_format, new String[] {}), 
                 new LabelBackground(
                     DebugUITools.getPreferenceColor(IDebugUIConstants.PREF_CHANGED_VALUE_BACKGROUND).getRGB()) 
                 {
@@ -706,9 +706,10 @@ public class VariableVMNode extends AbstractExpressionVMNode
     @ConfinedToDsfExecutor("getSession().getExecutor()")
     protected void fillAddressDataProperties(IPropertiesUpdate update, IExpressionDMAddress address)
     { 
-	    IExpressionDMAddress expression = address;
-	    IAddress expAddress = expression.getAddress();
-	    update.setProperty(PROP_VARIABLE_ADDRESS, "0x" + expAddress.toString(16)); //$NON-NLS-1$
+    	if (address instanceof IExpressionDMLocation)
+    		update.setProperty(PROP_VARIABLE_ADDRESS, ((IExpressionDMLocation)address).getLocation());
+    	else
+    		update.setProperty(PROP_VARIABLE_ADDRESS, "0x" + address.getAddress().toString(16)); //$NON-NLS-1$
     }
     
     public CellEditor getCellEditor(IPresentationContext context, String columnId, Object element, Composite parent) {
diff --git a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/messages.properties b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/messages.properties
index c957a6e9dec..ae1f44cfe5b 100644
--- a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/messages.properties
+++ b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/debug/ui/viewmodel/variable/messages.properties
@@ -7,16 +7,17 @@
 #
 # Contributors:
 #   Wind River Systems - initial API and implementation
-#   Wind River Systems - added Address
+#   Wind River Systems - added Location
+#   Wind River Systems - changed Location to Location
 ###############################################################################
 
 VariableColumnPresentation_name=Name
 VariableColumnPresentation_type=Type
 VariableColumnPresentation_value=Value
-VariableColumnPresentation_address=Address
+VariableColumnPresentation_location=Location
 
-VariableVMNode_Address_column__Error__text_format=
-VariableVMNode_Address_column__text_format={0}
+VariableVMNode_Location_column__Error__text_format=
+VariableVMNode_Location_column__text_format={0}
 VariableVMNode_Description_column__text_format=
 VariableVMNode_Expression_column__text_format={0}
 VariableVMNode_Name_column__text_format={0}
diff --git a/dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/debug/service/IExpressions.java b/dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/debug/service/IExpressions.java
index 293cc20f2f6..3ccb9a640e7 100644
--- a/dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/debug/service/IExpressions.java
+++ b/dsf/org.eclipse.cdt.dsf/src/org/eclipse/cdt/dsf/debug/service/IExpressions.java
@@ -11,6 +11,7 @@
  *******************************************************************************/
 package org.eclipse.cdt.dsf.debug.service;
 
+import java.math.BigInteger;
 import java.util.Map;
 
 import org.eclipse.cdt.core.IAddress;
@@ -41,14 +42,61 @@ public interface IExpressions extends IFormattedValues {
          */
         String getExpression();
     }
-    
+
+
     /**
      * The address and size of an expression.
      */
     public interface IExpressionDMAddress {
+        
+        /**
+         * Returns the address of the expression.
+         */
     	IAddress getAddress();
+    	
+    	/**
+    	 * Returns the size of the address.
+    	 */
     	int getSize();
     }
+ 
+    /**
+     * A representation of an expression location that does not correspond to 
+     * an address.  
+     * 
+     * @since 2.1
+     */
+    public interface IExpressionDMLocation extends IExpressionDMAddress {
+        
+        /**
+         * A constant that can be returned by {@link IExpressionDMAddress#getAddress()}
+         * to represent an invalid address.  Implementations of 
+         * <code>IExpressionDMLocation</code> can return this constant if no  
+         * valid address can be returned for a given expression location.  
+         */
+        public static final IAddress INVALID_ADDRESS = new IAddress() {
+            public IAddress add(BigInteger offset) { return this; }
+            public IAddress add(long offset) { return this; }
+            public BigInteger getMaxOffset() { return BigInteger.ZERO; }
+            public BigInteger distanceTo(IAddress other) { return BigInteger.ZERO; }
+            public BigInteger getValue() { return BigInteger.ZERO; }
+            public boolean isZero() { return false; }
+            public boolean isMax() { return false; }
+            public String toString(int radix) { return "INVALID"; }
+            public String toHexAddressString() { return toString(); }
+            public String toBinaryAddressString()  { return toString(); }
+            public int getCharsNum() { return 0; }
+            public int getSize() { return 0; }
+            public int compareTo(Object o) { return 0; }
+        };
+        
+        /**
+         * Returns a string representation of the expression location.
+         */
+    	public String getLocation();
+    }
+
+    
     
     /**
      * This is the model data interface that corresponds to IExpressionDMContext.
@@ -140,7 +188,9 @@ public interface IExpressions extends IFormattedValues {
     /**
      * Retrieves the address and size of an expression given by the expression context(<tt>dmc</tt>).
      * Non-lvalues do not have an addresses (e.g., "x + 5").  When the expression
--    * has no address, the data request monitor will contain null.
+-    * has no address, the request monitor will have an error with code 
+     * <code>IDsfStatusConstants.REQUEST_FAILED</code> and the data request
+     * monitor will contain null.
      * 
      * @param dmc
      *            The ExpressionDMC for the expression