From c8375c2e39e92412dd01fb880062dd2e9c97b41a Mon Sep 17 00:00:00 2001
From: Iru Cai <mytbk920423@gmail.com>
Date: Thu, 27 Nov 2014 16:45:44 +0800
Subject: check null pointer in SpgExpr...

---
 src/spiglet/spiglet2kanga/SpgExpr.java | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/spiglet/spiglet2kanga/SpgExpr.java b/src/spiglet/spiglet2kanga/SpgExpr.java
index 9f5fef9..a93601d 100644
--- a/src/spiglet/spiglet2kanga/SpgExpr.java
+++ b/src/spiglet/spiglet2kanga/SpgExpr.java
@@ -55,15 +55,22 @@ public class SpgExpr extends SpgSym {
 	
 	public HashSet<SpgTemp> getTmpUsed() {
 		HashSet<SpgTemp> s = new HashSet<SpgTemp>();
+		HashSet<SpgTemp> stmp;
 		switch (type) {
 		case ALLOC:
 			return se.getTmpUsed();
 		case BinOp:
 			s.add(oprand);
-			s.addAll(se.getTmpUsed());
+			stmp = se.getTmpUsed();
+			if (stmp!=null) {
+				s.addAll(se.getTmpUsed());
+			}
 			return s;
 		case CALL:
-			s.addAll(se.getTmpUsed());
+			stmp = se.getTmpUsed();
+			if (stmp!=null) {
+				s.addAll(se.getTmpUsed());
+			}
 			s.addAll(callParams);
 			return s;
 		case Simple:
-- 
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