conti@564: /*
conti@564:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
conti@564:  *
conti@564:  *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)
conti@564:  *  Copyright (C) 2012       Manuele Conti (conti.ma@alice.it)
conti@564:  *
conti@564:  *  This program is free software: you can redistribute it and/or modify
conti@564:  *  it under the terms of the GNU General Public License as published by
conti@564:  *  the Free Software Foundation, either version 3 of the License, or
conti@564:  *  (at your option) any later version.
conti@564:  *
conti@564:  *  This program is distributed in the hope that it will be useful,
conti@564:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
conti@564:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
conti@564:  *  GNU General Public License for more details.
conti@564:  *
conti@564:  *  You should have received a copy of the GNU General Public License
conti@564:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
conti@564:  *
conti@564:  *
conti@564:  * This code is made available on the understanding that it will not be
conti@564:  * used in safety-critical situations without a full and competent review.
conti@564:  */
conti@564: 
conti@564: /*
conti@564:  * An IEC 61131-3 compiler.
conti@564:  *
conti@564:  * Based on the
conti@564:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
conti@564:  *
conti@564:  */
conti@564: 
conti@564: /* Determine the data type of an constant expression.
conti@564:  * A reference to the relevant type definition is returned.
conti@564:  *
conti@564:  * For example:
conti@564:  *       2 + 3       -> returns reference 
conti@564:  *       22.2 - 5    -> returns reference
conti@564:  *       etc...
conti@564:  */
conti@564: 
conti@564: #include <vector>
conti@564: #include "../absyntax_utils/absyntax_utils.hh"
conti@564: 
conti@564: 
conti@564: 
conti@564: class constant_folding_c : public iterator_visitor_c {
conti@564:     search_varfb_instance_type_c *search_varfb_instance_type;
conti@564:     search_base_type_c search_base_type;
conti@564:     int error_count;
msousa@568:     bool warning_found;
conti@564:     int current_display_error_level;
conti@564: 
conti@564: public:
conti@564: 	constant_folding_c(symbol_c *symbol = NULL);
conti@564: 	virtual ~constant_folding_c(void);
conti@564: 	int get_error_count();
conti@564: 
conti@564: private:
conti@564:     /*********************/
conti@564:     /* B 1.2 - Constants */
conti@564:     /*********************/
conti@564:     /******************************/
conti@564:     /* B 1.2.1 - Numeric Literals */
conti@564:     /******************************/
conti@564:     void *visit(real_c *symbol);
conti@564:     void *visit(integer_c *symbol);
conti@564:     void *visit(neg_real_c *symbol);
conti@564:     void *visit(neg_integer_c *symbol);
conti@564:     void *visit(binary_integer_c *symbol);
conti@564:     void *visit(octal_integer_c *symbol);
conti@564:     void *visit(hex_integer_c *symbol);
conti@564:     void *visit(integer_literal_c *symbol);
conti@564:     void *visit(real_literal_c *symbol);
conti@564:     void *visit(bit_string_literal_c *symbol);
conti@564:     void *visit(boolean_literal_c *symbol);
conti@564:     void *visit(boolean_true_c *symbol);
conti@564:     void *visit(boolean_false_c *symbol);
conti@564: 
conti@564:     /***************************************/
conti@564:     /* B.3 - Language ST (Structured Text) */
conti@564:     /***************************************/
conti@564:     /***********************/
conti@564:     /* B 3.1 - Expressions */
conti@564:     /***********************/
conti@564:     void *visit(or_expression_c *symbol);
conti@564:     void *visit(xor_expression_c *symbol);
conti@564:     void *visit(and_expression_c *symbol);
conti@564:     void *visit(equ_expression_c *symbol);
conti@564:     void *visit(notequ_expression_c *symbol);
conti@564:     void *visit(lt_expression_c *symbol);
conti@564:     void *visit(gt_expression_c *symbol);
conti@564:     void *visit(le_expression_c *symbol);
conti@564:     void *visit(ge_expression_c *symbol);
conti@564:     void *visit(add_expression_c *symbol);
conti@564:     void *visit(sub_expression_c *symbol);
conti@564:     void *visit(mul_expression_c *symbol);
conti@564:     void *visit(div_expression_c *symbol);
conti@564:     void *visit(mod_expression_c *symbol);
conti@564:     void *visit(power_expression_c *symbol);
conti@564:     void *visit(neg_expression_c *symbol);
conti@564:     void *visit(not_expression_c *symbol);
conti@564: };
conti@564: