1 /*

     2  *  matiec - a compiler for the programming languages defined in IEC 61131-3

     3  *

     4  *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)

     5  *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant

     6  *

     7  *  This program is free software: you can redistribute it and/or modify

     8  *  it under the terms of the GNU General Public License as published by

     9  *  the Free Software Foundation, either version 3 of the License, or

    10  *  (at your option) any later version.

    11  *

    12  *  This program is distributed in the hope that it will be useful,

    13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    15  *  GNU General Public License for more details.

    16  *

    17  *  You should have received a copy of the GNU General Public License

    18  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

    19  *

    20  *

    21  * This code is made available on the understanding that it will not be

    22  * used in safety-critical situations without a full and competent review.

    23  */

    24 

    25 /*

    26  * An IEC 61131-3 compiler.

    27  *

    28  * Based on the

    29  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

    30  *

    31  */

    32 

    33 

    34 

    35 

    36 /* Returns the data type of an il_operand.

    37  *

    38  * Note that the il_operand may be a variable, in which case

    39  * we return the type of the variable instance.

    40  * The il_operand may also be a constant, in which case

    41  * we return the data type of that constant.

    42  *

    43  * The variable instance may be a member of a structured variable,

    44  * or an element in an array, or any combination of the two.

    45  *

    46  * The class constructor must be given the search scope

    47  * (function, function block or program within which

    48  * the possible il_operand variable instance was declared).

    49  */

    50 

    51 #include "absyntax_utils.hh"

    52 

    53 symbol_c *search_il_operand_type_c::get_type(symbol_c *il_operand) {

    54   symbol_c *res;

    55 

    56   /* We first assume that it is a constant... */

    57   res = search_constant_type.get_type(il_operand);

    58   if (res != NULL) return res;

    59 

    60   /* Nope, now we assume it is a variable, and determine its type... */

    61   res = search_varfb_instance_type.get_type(il_operand);

    62   if (NULL != res) return res;

    63 

    64   /* not found */

    65   return NULL;

    66 }