From a841af651905b32a756164ea5adbb1480a19259b Mon Sep 17 00:00:00 2001
From: Andrew Waterman
Date: Thu, 30 Jul 2015 17:42:37 -0700
Subject: Check for negative UInt literals

---
 src/main/scala/Chisel/Core.scala | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src')

diff --git a/src/main/scala/Chisel/Core.scala b/src/main/scala/Chisel/Core.scala
index 27d07e30..1dc9ddc7 100644
--- a/src/main/scala/Chisel/Core.scala
+++ b/src/main/scala/Chisel/Core.scala
@@ -762,6 +762,11 @@ sealed class UInt(dir: Direction, width: Int, lit: Option[LitArg] = None) extend
   def toSInt(): SInt = asSInt()
   def toUInt(): UInt = this
   def asUInt(): UInt = this
+
+  lit match {
+    case Some(x) => require(x.num >= 0, s"UInt literal ${x.num} is negative")
+    case None =>
+  }
 }
 
 trait UIntFactory {
-- 
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