ccb@201: /*
ccb@201:  * (c) 2003 Mario de Sousa
ccb@201:  *
ccb@201:  * Offered to the public under the terms of the GNU General Public License
ccb@201:  * as published by the Free Software Foundation; either version 2 of the
ccb@201:  * License, or (at your option) any later version.
ccb@201:  *
ccb@201:  * This program is distributed in the hope that it will be useful, but
ccb@201:  * WITHOUT ANY WARRANTY; without even the implied warranty of
ccb@201:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
ccb@201:  * Public License for more details.
ccb@201:  *
ccb@201:  * This code is made available on the understanding that it will not be
ccb@201:  * used in safety-critical situations without a full and competent review.
ccb@201:  */
ccb@201: 
ccb@201: /*
ccb@201:  * An IEC 61131-3 IL and ST compiler.
ccb@201:  *
ccb@201:  * Based on the
ccb@201:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
ccb@201:  *
ccb@201:  */
ccb@201: 
ccb@201: 
ccb@201: 
ccb@201: 
ccb@201: /* Returns the data type of an il_operand.
ccb@201:  *
ccb@201:  * Note that the il_operand may be a variable, in which case
ccb@201:  * we return the type of the variable instance.
ccb@201:  * The il_operand may also be a constant, in which case
ccb@201:  * we return the data type of that constant.
ccb@201:  *
ccb@201:  * The variable instance may be a member of a structured variable,
ccb@201:  * or an element in an array, or any combination of the two.
ccb@201:  *
ccb@201:  * The class constructor must be given the search scope
ccb@201:  * (function, function block or program within which
ccb@201:  * the possible il_operand variable instance was declared).
ccb@201:  */
ccb@201: 
ccb@202: #include "absyntax_utils.hh"
ccb@201: 
ccb@201: symbol_c *search_il_operand_type_c::get_type(symbol_c *il_operand) {
ccb@201:   symbol_c *res;
ccb@201: 
ccb@201:   /* We first assume that it is a constant... */
ccb@201:   res = search_constant_type.get_type(il_operand);
ccb@201:   if (res != NULL) return res;
ccb@201: 
ccb@201:   /* Nope, now we assume it is a variable, and determine its type... */
ccb@201:   res = search_varfb_instance_type.get_type(il_operand);
ccb@201:   if (NULL != res) return res;
ccb@201: 
ccb@201:   /* not found */
ccb@201:   return NULL;
ccb@201: }