qbe

commit bbf90069b3aed188ee1d2a7e5fb83ce93bce51be
parent 84bb28c0422c2d0dea555aeec946e73cf2b818a8
Author: Quentin Carbonneaux <quentin.carbonneaux@yale.edu>
Date:   Wed, 20 Apr 2016 14:03:38 -0400

disallow phi nodes in the start block

AFL found this bug.

Diffstat:
M
parse.c
 | 
2
+-

1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/parse.c b/parse.c
@@ -578,7 +578,7 @@ parseline(PState ps)
 	op = next();
 DoOp:
 	if (op == Tphi) {
-		if (ps != PPhi)
+		if (ps != PPhi || curb == curf->start)
 			err("unexpected phi instruction");
 		op = -1;
 	}