# HG changeset patch
# User William Astle <lost@l-w.ca>
# Date 1339279078 21600
# Node ID fa835b780ffb9dd8b26dcbee67137a5313b58f98
# Parent  07e1fac76321ea44ec3af098160e856cd646f3f7
Fix crash on conditionals with undefined symbols

Fix NULL pointer deref when parsing conditionals using undefined symbols.

diff -r 07e1fac76321 -r fa835b780ffb lwasm/pseudo.c
--- a/lwasm/pseudo.c	Sat Jun 09 15:47:22 2012 -0600
+++ b/lwasm/pseudo.c	Sat Jun 09 15:57:58 2012 -0600
@@ -1014,7 +1014,8 @@
 	}
 
 	e = lwasm_parse_cond(as, p);
-	lwasm_reduce_expr(as, e);
+	if (e)
+		lwasm_reduce_expr(as, e);
 	if (e && lw_expr_intval(e) != 0)
 	{
 		as -> skipcond = 1;
@@ -1036,7 +1037,8 @@
 	}
 
 	e = lwasm_parse_cond(as, p);
-	lwasm_reduce_expr(as, e);
+	if (e)
+		lwasm_reduce_expr(as, e);
 	if (e && lw_expr_intval(e) == 0)
 	{
 		as -> skipcond = 1;
@@ -1059,7 +1061,8 @@
 	}
 
 	e = lwasm_parse_cond(as, p);
-	lwasm_reduce_expr(as, e);
+	if (e)
+		lwasm_reduce_expr(as, e);
 	if (e && lw_expr_intval(e) <= 0)
 	{
 		as -> skipcond = 1;
@@ -1081,7 +1084,8 @@
 	}
 
 	e = lwasm_parse_cond(as, p);
-	lwasm_reduce_expr(as, e);
+	if (e)
+		lwasm_reduce_expr(as, e);
 	if (e && lw_expr_intval(e) < 0)
 	{
 		as -> skipcond = 1;
@@ -1103,7 +1107,8 @@
 	}
 
 	e = lwasm_parse_cond(as, p);
-	lwasm_reduce_expr(as, e);
+	if (e)
+		lwasm_reduce_expr(as, e);
 	if (e && lw_expr_intval(e) >= 0)
 	{
 		as -> skipcond = 1;
@@ -1125,7 +1130,8 @@
 	}
 
 	e = lwasm_parse_cond(as, p);
-	lwasm_reduce_expr(as, e);
+	if (e)
+		lwasm_reduce_expr(as, e);
 	if (e && lw_expr_intval(e) > 0)
 	{
 		as -> skipcond = 1;