absyntax_utils/search_expression_type.hh
author Laurent Bessard
Thu, 08 Nov 2012 18:55:57 +0100
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child 665 50fca2d3abd9
permissions -rwxr-xr-x
Fix DATE conversions standard functions
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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) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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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 ST 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 to a int_type_name_c object.
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 *       22.2 - 5    -> returns reference to a real_type_name_c object.
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 *       etc...
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 */
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/* WARNING   WARNING  WARNING
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 *
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 * When taking into consideration calls to functions, this search_expression_type_c
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 * class will use internal atributes (i.e. anotation) in the function_invocation_c symbol 
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 * in the abstract syntax tree.
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 *
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 * Since this anotation/atribute is only set/populated with the correct value
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 * during stage3 (semantic verification), this class will only work correctly
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 * after the semantic verification in stage 3 has been executed
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 * (to be more exact, the data type checking of stage 3).
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 */
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class search_expression_type_c: public search_constant_type_c {
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  private:
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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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  public:
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    search_expression_type_c(symbol_c *search_scope);
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    virtual ~search_expression_type_c(void);
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    /* A helper function... */
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    bool is_bool_type(symbol_c *type_symbol);
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    bool is_time_type(symbol_c *type_symbol);
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    bool is_string_type(symbol_c *type_symbol);
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    bool is_literal_integer_type(symbol_c *type_symbol);
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    bool is_integer_type(symbol_c *type_symbol);
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    bool is_literal_real_type(symbol_c *type_symbol);
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    bool is_real_type(symbol_c *type_symbol);
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    bool is_num_type(symbol_c *type_symbol);
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    bool is_nbinary_type(symbol_c *type_symbol);
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    bool is_binary_type(symbol_c *type_symbol);
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    bool is_same_type(symbol_c *first_type, symbol_c *second_type);
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    symbol_c* common_type(symbol_c *first_type, symbol_c *second_type);
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    symbol_c* default_literal_type(symbol_c *symbol);
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    /*
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    #include "search_type_code.c"
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    */
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    void *compute_standard_function_default(function_invocation_c *st_symbol, il_formal_funct_call_c *il_symbol);
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    void *compute_standard_function_il(il_function_call_c *symbol, symbol_c *param_data_type);
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    /*static bool_type_name_c bool_type_name;*/
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    /* A helper function... */
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    void *compute_boolean_expression(symbol_c *left_type, symbol_c *right_type);
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    /* A helper function... */
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    void *compute_numeric_expression(symbol_c *left_type, symbol_c *right_type);
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    /* a helper function... */
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    symbol_c *base_type(symbol_c *symbol);
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    /*********************/
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    /* B 1.4 - Variables */
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    /*********************/
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    void *visit(symbolic_variable_c *symbol);
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    /********************************************/
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    /* B 1.4.1 - Directly Represented Variables */
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    /********************************************/
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    void *visit(direct_variable_c *symbol);
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    /*************************************/
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    /* B 1.4.2 - Multi-element variables */
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    /*************************************/
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    void *visit(array_variable_c *symbol);
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    void *visit(structured_variable_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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    void *visit(function_invocation_c *symbol);
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    static integer_c integer;
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}; // search_expression_type_c
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da1a8186f86f Initial (very rough) version of semantic checker (stage3)
Catarina Boucinha <ccb@fe.up.pt>
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