Index: ax-gdb.c
===================================================================
RCS file: /cvs/src/src/gdb/ax-gdb.c,v
retrieving revision 1.69
diff -p -r1.69 ax-gdb.c
*** ax-gdb.c	17 Mar 2010 22:04:43 -0000	1.69
--- ax-gdb.c	18 Mar 2010 01:44:44 -0000
*************** gen_int_literal (struct agent_expr *ax, 
*** 745,750 ****
--- 745,759 ----
  static void
  require_rvalue (struct agent_expr *ax, struct axs_value *value)
  {
+   /* Only deal with scalars, structs and such may be too large
+      to fit in a stack entry.  */
+   value->type = check_typedef (value->type);
+   if (TYPE_CODE (value->type) == TYPE_CODE_ARRAY
+       || TYPE_CODE (value->type) == TYPE_CODE_STRUCT
+       || TYPE_CODE (value->type) == TYPE_CODE_UNION
+       || TYPE_CODE (value->type) == TYPE_CODE_FUNC)
+     error ("Value not scalar: cannot be an rvalue.");
+ 
    switch (value->kind)
      {
      case axs_rvalue: