add NULL ptr check

2007-03-11 17:29:54 -06:00
parent ccb80d7ec4
commit 15aa7aaa93
1 changed files with 9 additions and 6 deletions
@@ -1985,12 +1985,15 @@ _slang_gen_assignment(slang_assemble_ctx * A, slang_operation *oper)
   else {
      slang_ir_node *n, *lhs, *rhs;
      lhs = _slang_gen_operation(A, &oper->children[0]);
-      if (lhs->Store->File != PROGRAM_OUTPUT &&
-          lhs->Store->File != PROGRAM_TEMPORARY &&
-          lhs->Store->File != PROGRAM_VARYING &&
-          lhs->Store->File != PROGRAM_UNDEFINED) {
-         slang_info_log_error(A->log, "Assignment to read-only variable");
-         return NULL;
+
+      if (lhs) {
+         if (lhs->Store->File != PROGRAM_OUTPUT &&
+             lhs->Store->File != PROGRAM_TEMPORARY &&
+             lhs->Store->File != PROGRAM_VARYING &&
+             lhs->Store->File != PROGRAM_UNDEFINED) {
+            slang_info_log_error(A->log, "Assignment to read-only variable");
+            return NULL;
+         }
      }

      rhs = _slang_gen_operation(A, &oper->children[1]);