stage3/constant_folding.hh
author Mario de Sousa <msousa@fe.up.pt>
Sun, 10 Jun 2012 15:38:24 +0100
changeset 574 d291a942899b
parent 568 5f79478142d7
child 612 c062ff18d04f
permissions -rw-r--r--
Fix remaining overflow checks.
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2012       Manuele Conti (conti.ma@alice.it)
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * An IEC 61131-3 compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 */
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/* Determine the data type of an constant expression.
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 * A reference to the relevant type definition is returned.
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 *
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 * For example:
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 *       2 + 3       -> returns reference 
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 *       22.2 - 5    -> returns reference
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 *       etc...
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 */
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#include <vector>
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#include "../absyntax_utils/absyntax_utils.hh"
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class constant_folding_c : public iterator_visitor_c {
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    search_varfb_instance_type_c *search_varfb_instance_type;
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    search_base_type_c search_base_type;
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    int error_count;
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    bool warning_found;
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    int current_display_error_level;
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public:
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	constant_folding_c(symbol_c *symbol = NULL);
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	virtual ~constant_folding_c(void);
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	int get_error_count();
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private:
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    /*********************/
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    /* B 1.2 - Constants */
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    /*********************/
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    /******************************/
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    /* B 1.2.1 - Numeric Literals */
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    /******************************/
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    void *visit(real_c *symbol);
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    void *visit(integer_c *symbol);
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    void *visit(neg_real_c *symbol);
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    void *visit(neg_integer_c *symbol);
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    void *visit(binary_integer_c *symbol);
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    void *visit(octal_integer_c *symbol);
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    void *visit(hex_integer_c *symbol);
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    void *visit(integer_literal_c *symbol);
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    void *visit(real_literal_c *symbol);
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    void *visit(bit_string_literal_c *symbol);
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    void *visit(boolean_literal_c *symbol);
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    void *visit(boolean_true_c *symbol);
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    void *visit(boolean_false_c *symbol);
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    /***************************************/
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    /* B.3 - Language ST (Structured Text) */
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    /***************************************/
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    /***********************/
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    /* B 3.1 - Expressions */
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    /***********************/
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    void *visit(or_expression_c *symbol);
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    void *visit(xor_expression_c *symbol);
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    void *visit(and_expression_c *symbol);
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    void *visit(equ_expression_c *symbol);
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    void *visit(notequ_expression_c *symbol);
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    void *visit(lt_expression_c *symbol);
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    void *visit(gt_expression_c *symbol);
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    void *visit(le_expression_c *symbol);
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    void *visit(ge_expression_c *symbol);
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    void *visit(add_expression_c *symbol);
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    void *visit(sub_expression_c *symbol);
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    void *visit(mul_expression_c *symbol);
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    void *visit(div_expression_c *symbol);
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    void *visit(mod_expression_c *symbol);
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    void *visit(power_expression_c *symbol);
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    void *visit(neg_expression_c *symbol);
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    void *visit(not_expression_c *symbol);
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};
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