mario@181: /*
mario@181:  * (c) 2003 Mario de Sousa
mario@181:  *
mario@181:  * Offered to the public under the terms of the GNU General Public License
mario@181:  * as published by the Free Software Foundation; either version 2 of the
mario@181:  * License, or (at your option) any later version.
mario@181:  *
mario@181:  * This program is distributed in the hope that it will be useful, but
mario@181:  * WITHOUT ANY WARRANTY; without even the implied warranty of
mario@181:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
mario@181:  * Public License for more details.
mario@181:  *
mario@181:  * This code is made available on the understanding that it will not be
mario@181:  * used in safety-critical situations without a full and competent review.
mario@181:  */
mario@181: 
mario@181: /*
mario@181:  * An IEC 61131-3 IL and ST compiler.
mario@181:  *
mario@181:  * Based on the
mario@181:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
mario@181:  *
mario@181:  */
mario@181: 
mario@181: /* Determine the data type of an ST expression.
mario@181:  * A reference to the relevant type definition is returned.
mario@181:  *
mario@181:  * For example:
mario@181:  *       2 + 3       -> returns reference to a int_type_name_c object.
mario@181:  *       22.2 - 5    -> returns reference to a real_type_name_c object.
mario@181:  *       etc...
mario@181:  */
mario@181: 
mario@181: class search_expression_type_c: public search_constant_type_c {
mario@181: 
mario@181:   private:
mario@181:     search_varfb_instance_type_c *search_varfb_instance_type;
mario@181:     search_base_type_c search_base_type;
mario@181: 
mario@181: 
mario@181:   public:
mario@181:     search_expression_type_c(symbol_c *search_scope);
mario@181:     virtual ~search_expression_type_c(void);
mario@181: 
mario@181:     /* A helper function... */
mario@181:     bool is_bool_type(symbol_c *type_symbol);
mario@181:     bool is_time_type(symbol_c *type_symbol);
mario@181:     bool is_string_type(symbol_c *type_symbol);
ccb@202:     bool is_literal_integer_type(symbol_c *type_symbol);
mario@181:     bool is_integer_type(symbol_c *type_symbol);
ccb@202:     bool is_literal_real_type(symbol_c *type_symbol);
mario@181:     bool is_real_type(symbol_c *type_symbol);
mario@181:     bool is_num_type(symbol_c *type_symbol);
mario@181:     bool is_nbinary_type(symbol_c *type_symbol);
mario@181:     bool is_binary_type(symbol_c *type_symbol);
mario@181: 
mario@181:     bool is_same_type(symbol_c *first_type, symbol_c *second_type);
mario@181:     symbol_c* common_type(symbol_c *first_type, symbol_c *second_type);
mario@181: 
mario@181:     /*
mario@181:     #include "search_type_code.c"
mario@181:     */
mario@181:     void *compute_standard_function_default(function_invocation_c *st_symbol, il_formal_funct_call_c *il_symbol);
mario@181:     void *compute_standard_function_il(il_function_call_c *symbol, symbol_c *param_data_type);
mario@181: 
mario@181: 
mario@181: 
mario@181:     /*static bool_type_name_c bool_type_name;*/
mario@181: 
mario@181:     /* A helper function... */
mario@181:     void *compute_boolean_expression(symbol_c *left_type, symbol_c *right_type);
mario@181: 
mario@181:     /* A helper function... */
mario@181:     void *compute_numeric_expression(symbol_c *left_type, symbol_c *right_type);
mario@181: 
mario@181:     /* a helper function... */
mario@181:     symbol_c *base_type(symbol_c *symbol);
mario@181: 
mario@181:     /*********************/
mario@181:     /* B 1.4 - Variables */
mario@181:     /*********************/
mario@181:     
mario@181:     void *visit(symbolic_variable_c *symbol);
mario@181: 
mario@181:     /********************************************/
mario@181:     /* B 1.4.1 - Directly Represented Variables */
mario@181:     /********************************************/
mario@181:     void *visit(direct_variable_c *symbol);
mario@181: 
mario@181:     /*************************************/
mario@181:     /* B 1.4.2 - Multi-element variables */
mario@181:     /*************************************/
mario@181:  
mario@181:     void *visit(array_variable_c *symbol);
mario@181:     void *visit(structured_variable_c *symbol);
mario@181: 
mario@181:     /***************************************/
mario@181:     /* B.3 - Language ST (Structured Text) */
mario@181:     /***************************************/
mario@181:     /***********************/
mario@181:     /* B 3.1 - Expressions */
mario@181:     /***********************/
mario@181:     void *visit(or_expression_c *symbol);
mario@181:     void *visit(xor_expression_c *symbol);
mario@181:     void *visit(and_expression_c *symbol);
mario@181:     void *visit(equ_expression_c *symbol);
mario@181:     void *visit(notequ_expression_c *symbol);
mario@181:     void *visit(lt_expression_c *symbol);
mario@181:     void *visit(gt_expression_c *symbol);
mario@181:     void *visit(le_expression_c *symbol);
mario@181:     void *visit(ge_expression_c *symbol);
mario@181:     
mario@181:     void *visit(add_expression_c *symbol);
mario@181:     void *visit(sub_expression_c *symbol);
mario@181:     void *visit(mul_expression_c *symbol);
mario@181:     void *visit(div_expression_c *symbol);
mario@181:     void *visit(mod_expression_c *symbol);
mario@181:     void *visit(power_expression_c *symbol);
mario@181:     void *visit(neg_expression_c *symbol);
mario@181:     void *visit(not_expression_c *symbol);
mario@181:     void *visit(function_invocation_c *symbol);
ccb@202: 
ccb@202: 
ccb@202:     static integer_c integer;
ccb@202: 
mario@181: }; // search_expression_type_c
mario@181: 
mario@181: 
ccb@202: