# HG changeset patch
# User mjsousa
# Date 1375867472 -3600
# Node ID a5f08df62002b5ece28c00feba03f57bd7d79668
# Parent  e3800aff352c67ed52bbfe688322b7191029a4f3
Fix segfault when doing lvalue check of buggy IEC 61131-3 source code

diff -r e3800aff352c -r a5f08df62002 stage3/lvalue_check.cc
--- a/stage3/lvalue_check.cc	Wed Aug 07 10:18:29 2013 +0100
+++ b/stage3/lvalue_check.cc	Wed Aug 07 10:24:32 2013 +0100
@@ -261,6 +261,12 @@
  */
 #include <string.h> /* required for strcmp() */
 void lvalue_check_c::check_nonformal_call(symbol_c *f_call, symbol_c *f_decl) {
+	/* if data type semantic verification was unable to determine which function is being called,
+	 * then it does not make sense to go ahead and check for lvalues to unknown parameters.
+	 * We simply bug out!
+	 */
+	if (NULL == f_decl) return;
+	
 	symbol_c *call_param_value;
 	identifier_c *param_name;
 	function_param_iterator_c       fp_iterator(f_decl);