fix debug(f) error when f is duplicated

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/function/FunctionDefinitionNode.java

@@ -91,7 +91,7 @@ public final class FunctionDefinitionNode extends RRootNode implements RSyntaxNo
      * unknown.
      */
     private String description;
-    private final FunctionUID uuid;
+    private FunctionUID uuid;
     private boolean instrumented = false;
 
     @Child private FrameSlotNode onExitSlot;
@@ -163,9 +163,14 @@ public final class FunctionDefinitionNode extends RRootNode implements RSyntaxNo
     @Override
     public RRootNode duplicateWithNewFrameDescriptor() {
         FrameDescriptor frameDesc = new FrameDescriptor();
+        FunctionUID thisUuid = uuid;
         FrameSlotChangeMonitor.initializeFunctionFrameDescriptor(description != null && !description.isEmpty() ? description : "<function>", frameDesc);
-        return new FunctionDefinitionNode(getSourceSection(), frameDesc, (BodyNode) body.unwrap().deepCopy(), getFormalArguments(), description, substituteFrame, argPostProcess == null ? null
-                        : argPostProcess.deepCopyUnconditional());
+        FunctionDefinitionNode result = new FunctionDefinitionNode(getSourceSection(), frameDesc, (BodyNode) body.unwrap().deepCopy(), getFormalArguments(), description, substituteFrame,
+                        argPostProcess == null ? null
+                                        : argPostProcess.deepCopyUnconditional());
+        // Instrumentation depends on this copy having same uuid
+        result.uuid = thisUuid;
+        return result;
     }
 
     private static boolean containsAnyDispatch(BodyNode body) {

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/instrument/RInstrument.java

 /*
- * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2016, 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
@@ -216,8 +216,10 @@ public class RInstrument {
     public static void registerFunctionDefinition(FunctionDefinitionNode fdn) {
         FunctionUID uid = fdn.getUID();
         FunctionData fd = functionMap.get(uid);
-        assert fd == null;
-        functionMap.put(uid, new FunctionData(uid, fdn));
+        // Owing to FDN duplication, fdn may be registered multiple times
+        if (fd == null) {
+            functionMap.put(uid, new FunctionData(uid, fdn));
+        }
     }
 
     public static FunctionIdentification getFunctionIdentification(FunctionUID uid) {