Make read-only variables not be considered lvalues.

This should fix tests trying to assign to builtin "in" variables, and
will also be relied on for post_inc/dec handling.

diff --git a/ir.h b/ir.h
index a69f932c5a8de19ddf60feb0dbe0d3c521c09f85..7e2f304b41d0055762d87fc49f85c858aa8fed3b 100644 (file)
--- a/ir.h
+++ b/ir.h
@@ -455,7 +455,17 @@ public:
 
    bool is_lvalue()
    {
-      return var != NULL;
+      ir_variable *as_var;
+
+      if (var == NULL)
+        return NULL;
+
+      as_var = var->as_variable();
+
+      if (as_var == NULL)
+        return NULL;
+
+      return !as_var->read_only;
    }
 
    enum {