From f83c25a43c1f10eaa8b5d99a35209091110dc5dd Mon Sep 17 00:00:00 2001
From: Jim Lawson
Date: Wed, 7 Oct 2015 08:59:46 -0700
Subject: Fix for getDump with empty parameters. Avoid:

    [error] (run-main-0) java.lang.UnsupportedOperationException: empty.reduceLeft
    java.lang.UnsupportedOperationException: empty.reduceLeft

when invoked via chiselMain() with no Parameters.
---
 src/main/scala/Chisel/Parameters.scala | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/main/scala/Chisel/Parameters.scala b/src/main/scala/Chisel/Parameters.scala
index cc1fe0be..c2d32fbd 100644
--- a/src/main/scala/Chisel/Parameters.scala
+++ b/src/main/scala/Chisel/Parameters.scala
@@ -160,7 +160,11 @@ class ParameterDump {
   def apply[T](key:Any,value:T):T = {addToDump(key,value); value}
   def apply[T](knob:Knob[T]):Knob[T] = {knobList += knob.name; knob}
   def addToDump(key:Any,value:Any) = dump += ((key,value))
-  def getDump:String = dump.map(_.toString).reduce(_+"\n"+_) + "\n"
+  def getDump:String = if (!dump.isEmpty) {
+    dump.map(_.toString).reduce(_+"\n"+_) + "\n"
+  } else {
+    ""
+  }
 }
 
 // objects given to the user in mask functions (site,here,up)
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