lbessard@70: /*
lbessard@70:  * (c) 2003 Mario de Sousa
lbessard@70:  *
lbessard@70:  * Offered to the public under the terms of the GNU General Public License
lbessard@70:  * as published by the Free Software Foundation; either version 2 of the
lbessard@70:  * License, or (at your option) any later version.
lbessard@70:  *
lbessard@70:  * This program is distributed in the hope that it will be useful, but
lbessard@70:  * WITHOUT ANY WARRANTY; without even the implied warranty of
lbessard@70:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
lbessard@70:  * Public License for more details.
lbessard@70:  *
lbessard@70:  * This code is made available on the understanding that it will not be
lbessard@70:  * used in safety-critical situations without a full and competent review.
lbessard@70:  */
lbessard@70: 
lbessard@70: /*
lbessard@70:  * An IEC 61131-3 IL and ST compiler.
lbessard@70:  *
lbessard@70:  * Based on the
lbessard@70:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
lbessard@70:  *
lbessard@70:  */
lbessard@70: 
lbessard@70: 
lbessard@70: /* Determine the data type of an ST expression.
lbessard@70:  * A reference to the relevant type definition is returned.
lbessard@70:  *
lbessard@70:  * For example:
lbessard@70:  *       2 + 3       -> returns reference to a int_type_name_c object.
lbessard@70:  *       22.2 - 5    -> returns reference to a real_type_name_c object.
lbessard@70:  *       etc...
lbessard@70:  */
lbessard@70: 
lbessard@70: #include "function_type_decl.h"
lbessard@70: #include "get_function_type_decl.c"
lbessard@70: 
lbessard@70: #if 0
lbessard@70: typedef enum {function_add,
lbessard@70:               function_sub,
lbessard@70:               function_and,
lbessard@70:               function_or,
lbessard@70:               function_sqrt,
lbessard@70:               function_none} function_type_t;
lbessard@70: 
lbessard@70: 
lbessard@70: function_type_t get_function_type(identifier_c *function_name) {
lbessard@70:   if (!strcasecmp(function_name->value, "ADD"))
lbessard@70:     return function_add;
lbessard@70:   else if (!strcasecmp(function_name->value, "SUB"))
lbessard@70:     return function_sub;
lbessard@70:   else if (!strcasecmp(function_name->value, "AND"))
lbessard@70:     return function_and;
lbessard@70:   else if (!strcasecmp(function_name->value, "OR"))
lbessard@70:     return function_or;
lbessard@70:   else if (!strcasecmp(function_name->value, "SQRT"))
lbessard@70:     return function_sqrt;
lbessard@70:   else return function_none;
lbessard@70: }
lbessard@70: #endif
lbessard@70: 
lbessard@70: 
lbessard@70: symbol_c *generate_param_name(const char *name) {
lbessard@70:   symbol_c *param_name = new identifier_c(name);
lbessard@70:   return param_name;
lbessard@70: }
lbessard@70: 
lbessard@70: 
lbessard@70: symbol_c *generate_param_name(const char *format, int number) {
lbessard@70:   char name[10];
lbessard@70:   sprintf(name, format, number);
lbessard@70:   symbol_c *param_name = new identifier_c(name);
lbessard@70:   return param_name;
lbessard@70: }
lbessard@70: 
lbessard@70: 
lbessard@70: class search_expression_type_c: public search_constant_type_c {
lbessard@70:   private:
lbessard@70:     search_varfb_instance_type_c *search_varfb_instance_type;
lbessard@70:     search_base_type_c search_base_type;
lbessard@70: 
lbessard@70:   public:
lbessard@70:     search_expression_type_c(symbol_c *search_scope) {
lbessard@70:       search_varfb_instance_type = new search_varfb_instance_type_c(search_scope);
lbessard@70:     }
lbessard@70: 
lbessard@70:     virtual ~search_expression_type_c(void) {
lbessard@70:       delete search_varfb_instance_type;
lbessard@70:     }
lbessard@70: 
lbessard@70:     /* A helper function... */
lbessard@70:     bool is_bool_type(symbol_c *type_symbol) {
lbessard@70:       return (typeid(*type_symbol) == typeid(bool_type_name_c));
lbessard@70:     }
lbessard@70: 
lbessard@70:     /* A helper function... */
lbessard@70:     bool is_time_type(symbol_c *type_symbol) {
lbessard@70:       if (typeid(*type_symbol) == typeid(time_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(date_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(tod_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(dt_type_name_c)) {return true;}
lbessard@70:       return false;
lbessard@70:     }
lbessard@70: 
lbessard@70:     /* A helper function... */
lbessard@70:     bool is_integer_type(symbol_c *type_symbol) {
lbessard@70:       if (typeid(*type_symbol) == typeid(sint_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(int_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(dint_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(lint_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(usint_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(uint_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(udint_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(ulint_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(constant_int_type_name_c)) {return true;}
lbessard@70:       return false;
lbessard@70:     }
lbessard@70: 
lbessard@70:     bool is_real_type(symbol_c *type_symbol) {
lbessard@70:       if (typeid(*type_symbol) == typeid(real_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(lreal_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(constant_real_type_name_c)) {return true;}
lbessard@70:       return false;
lbessard@70:     }
lbessard@70: 
lbessard@70:     bool is_num_type(symbol_c *type_symbol) {
lbessard@70:       return is_real_type(type_symbol) || is_integer_type(type_symbol);
lbessard@70:     }
lbessard@70: 
lbessard@70:     bool is_nbinary_type(symbol_c *type_symbol) {
lbessard@70:       if (typeid(*type_symbol) == typeid(byte_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(word_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(dword_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(lword_type_name_c)) {return true;}
lbessard@70:       if (typeid(*type_symbol) == typeid(constant_int_type_name_c)) {return true;}
lbessard@70:       return false;
lbessard@70:     }
lbessard@70: 
lbessard@70:     bool is_binary_type(symbol_c *type_symbol) {
lbessard@70:       if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;}
lbessard@70:       return is_nbinary_type(type_symbol);
lbessard@70:     }
lbessard@70:     
lbessard@70:     bool is_same_type(symbol_c *first_type, symbol_c *second_type) {
lbessard@70:       if (typeid(*first_type) == typeid(*second_type)) {return true;}
lbessard@70:       if (is_integer_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return true;}
lbessard@70:       if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_integer_type(second_type))) {return true;}
lbessard@70:       if (is_binary_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return true;}
lbessard@70:       if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_binary_type(second_type))) {return true;}
lbessard@70:       if (is_real_type(first_type) && (typeid(*second_type) == typeid(constant_real_type_name_c))) {return true;}
lbessard@70:       if ((typeid(*first_type) == typeid(constant_real_type_name_c) && is_real_type(second_type))) {return true;}
lbessard@70:       return false;
lbessard@70:     }
lbessard@70: 
lbessard@70:     symbol_c* common_type(symbol_c *first_type, symbol_c *second_type) {
lbessard@70:       if (typeid(*first_type) == typeid(*second_type)) {return first_type;}
lbessard@70:       if (is_integer_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return first_type;}
lbessard@70:       if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_integer_type(second_type))) {return second_type;}
lbessard@70:       if (is_binary_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return first_type;}
lbessard@70:       if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_binary_type(second_type))) {return second_type;}
lbessard@70:       if (is_real_type(first_type) && (typeid(*second_type) == typeid(constant_real_type_name_c))) {return first_type;}
lbessard@70:       if ((typeid(*first_type) == typeid(constant_real_type_name_c) && is_real_type(second_type))) {return second_type;}
lbessard@70:       return NULL;
lbessard@70:     }
lbessard@70: 
lbessard@70: #include "search_type_code.c"
lbessard@70: 
lbessard@70: #if 0
lbessard@70:   void *compute_standard_function_st(function_invocation_c *symbol) {
lbessard@70:     symbol_c *current_type = NULL;
lbessard@70:     symbol_c *return_type = NULL;
lbessard@70: 
lbessard@70:     function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
lbessard@70:     function_call_param_iterator_c function_call_param_iterator(symbol);
lbessard@70:     search_expression_type_c* search_expression_type = this;
lbessard@70:     
lbessard@70:     for(int current_param = 0; current_param < ((list_c *)symbol->parameter_assignment_list)->n; current_param++) {
lbessard@70:       symbol_c *param_name = NULL;
lbessard@70:       switch (current_function_type) {
lbessard@70:         case function_add:
lbessard@70:         case function_and:
lbessard@70:         case function_or:
lbessard@70:           param_name = generate_param_name("IN%d", current_param + 1);
lbessard@70:           break;
lbessard@70:         case function_sub:
lbessard@70:           if (current_param < 2)
lbessard@70:             param_name = generate_param_name("IN%d", current_param + 1);
lbessard@70:           else ERROR;
lbessard@70:           break;
lbessard@70:         default: ERROR;
lbessard@70:       }
lbessard@70:       
lbessard@70:       /* Get the value from a foo(<param_name> = <param_value>) style call */
lbessard@70:       symbol_c *param_value = function_call_param_iterator.search(param_name);
lbessard@70:       delete param_name;
lbessard@70:       
lbessard@70:       /* Get the value from a foo(<param_value>) style call */
lbessard@70:       if (param_value == NULL)
lbessard@70:         param_value = function_call_param_iterator.next();
lbessard@70:       
lbessard@70:       if (param_value == NULL) ERROR;
lbessard@70:       
lbessard@70:       symbol_c *param_type = (symbol_c *)param_value->accept(*this);
lbessard@70:       
lbessard@70:       switch (current_function_type) {
lbessard@70:         case function_add:
lbessard@70:           if (current_param == 0)
lbessard@70:             current_type = param_type;
lbessard@70:           else if (current_param == 1) {
lbessard@70:             if ((is_integer_type(current_type) && is_same_type(current_type, param_type)) ||
lbessard@70:                 (is_real_type(current_type) && is_same_type(current_type, param_type))) {
lbessard@70:               current_type = common_type(current_type, param_type);
lbessard@70:               return_type = current_type;
lbessard@70:             }
lbessard@70:             else if (is_time_type(current_type)) {
lbessard@70:               if ((typeid(*current_type) == typeid(time_type_name_c)) && (typeid(*param_type) == typeid(time_type_name_c))) {return_type = (symbol_c *)&time_type_name;}
lbessard@70:               else if (typeid(*current_type) == typeid(tod_type_name_c) && typeid(*param_type) == typeid(time_type_name_c)) {return_type = (symbol_c *)&tod_type_name;}
lbessard@70:               else if (typeid(*current_type) == typeid(dt_type_name_c) && typeid(*param_type) == typeid(time_type_name_c)) {return_type = (symbol_c *)&dt_type_name;}
lbessard@70:               else ERROR;
lbessard@70:             }
lbessard@70:             else ERROR;
lbessard@70:           }
lbessard@70:           else if (!is_time_type(current_type) && is_same_type(current_type, param_type)) {
lbessard@70:             current_type = common_type(current_type, param_type);
lbessard@70:             return_type = current_type;
lbessard@70:           }
lbessard@70:           else ERROR;
lbessard@70:           break;
lbessard@70:         case function_sub:
lbessard@70:           if (current_param == 0)
lbessard@70:             current_type = param_type;
lbessard@70:           else if (current_param == 1) {
lbessard@70:             if ((is_integer_type(current_type) && is_same_type(current_type, param_type)) ||
lbessard@70:                 (is_real_type(current_type) && is_same_type(current_type, param_type)))
lbessard@70:               return_type = common_type(current_type, param_type);
lbessard@70:             else if (is_time_type(current_type)) {
lbessard@70:               if (typeid(*current_type) == typeid(time_type_name_c) && typeid(*param_type) == typeid(time_type_name_c)) {return_type = (symbol_c *)&time_type_name;}
lbessard@70:               else if (typeid(*current_type) == typeid(date_type_name_c) && typeid(*param_type) == typeid(date_type_name_c)) {return_type = (symbol_c *)&time_type_name;}
lbessard@70:               else if (typeid(*current_type) == typeid(tod_type_name_c) && typeid(*param_type) == typeid(time_type_name_c)) {return_type = (symbol_c *)&tod_type_name;}
lbessard@70:               else if (typeid(*current_type) == typeid(tod_type_name_c) && typeid(*param_type) == typeid(tod_type_name_c)) {return_type = (symbol_c *)&time_type_name;}
lbessard@70:               else if (typeid(*current_type) == typeid(dt_type_name_c) && typeid(*param_type) == typeid(time_type_name_c)) {return_type = (symbol_c *)&dt_type_name;}
lbessard@70:               else if (typeid(*current_type) == typeid(dt_type_name_c) && typeid(*param_type) == typeid(dt_type_name_c)) {return_type = (symbol_c *)&time_type_name;}
lbessard@70:               else ERROR;
lbessard@70:             }
lbessard@70:             else ERROR;
lbessard@70:           }
lbessard@70:           else ERROR;
lbessard@70:           break;
lbessard@70:         case function_and:
lbessard@70:         case function_or:
lbessard@70:           if (current_param == 0)
lbessard@70:             if (is_binary_type(param_type))
lbessard@70:               current_type = param_type;
lbessard@70:             else ERROR;
lbessard@70:           else if (is_same_type(current_type, param_type))
lbessard@70:             return_type = common_type(current_type, param_type);
lbessard@70:           else ERROR;
lbessard@70:           break;
lbessard@70:         default: ERROR;
lbessard@70:       }
lbessard@70:     }
lbessard@70:     return (void *)return_type;
lbessard@70:   }
lbessard@70: 
lbessard@70:   void *compute_standard_function_il(il_function_call_c *symbol, symbol_c *param_type) {
lbessard@70:     /*symbol_c *current_type = NULL;*/
lbessard@70:     symbol_c *return_type = NULL;
lbessard@70:     function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
lbessard@70:     if (current_function_type == function_none) ERROR;
lbessard@70:     
lbessard@70:     function_call_param_iterator_c function_call_param_iterator(symbol);
lbessard@70:     
lbessard@70:     int nb_param = 1;
lbessard@70:     if (symbol->il_operand_list != NULL)
lbessard@70:       nb_param += ((list_c *)symbol->il_operand_list)->n;
lbessard@70: 
lbessard@70:     for(int current_param = 0; current_param < nb_param; current_param++) {
lbessard@70:       
lbessard@70:       if (current_param != 0) {
lbessard@70:         symbol_c *param_name = NULL;
lbessard@70:         switch (current_function_type) {
lbessard@70:           default: ERROR;
lbessard@70:         }
lbessard@70:         
lbessard@70:         /* Get the value from a foo(<param_name> = <param_value>) style call */
lbessard@70:         symbol_c *param_value = function_call_param_iterator.search(param_name);
lbessard@70:         delete param_name;
lbessard@70:         
lbessard@70:         /* Get the value from a foo(<param_value>) style call */
lbessard@70:         if (param_value == NULL)
lbessard@70:           param_value = function_call_param_iterator.next();
lbessard@70:         
lbessard@70:         if (param_value == NULL) ERROR;
lbessard@70:         
lbessard@70:         param_type = (symbol_c *)param_value->accept(*this);
lbessard@70:       }
lbessard@70:       
lbessard@70:       switch (current_function_type) {
lbessard@70:         case function_sqrt:
lbessard@70:           if (current_param == 0 && is_real_type(param_type))
lbessard@70:             return_type = param_type;
lbessard@70:           else ERROR;
lbessard@70:           break;
lbessard@70:         default: ERROR;
lbessard@70:       }
lbessard@70:     }
lbessard@70:     
lbessard@70:     return (void *)return_type;
lbessard@70:   }
lbessard@70: #endif
lbessard@70: 
lbessard@70:   /*static bool_type_name_c bool_type_name;*/
lbessard@70: 
lbessard@70:   /* A helper function... */
lbessard@70:   void *compute_boolean_expression(symbol_c *left_type, symbol_c *right_type) {
lbessard@70:     if (!is_same_type(left_type, right_type))
lbessard@70:       ERROR;
lbessard@70:     if (!is_bool_type(left_type) && !is_binary_type(left_type))
lbessard@70:       ERROR;
lbessard@70:     if (typeid(*left_type) == typeid(constant_int_type_name_c)) {return (void *)right_type;}
lbessard@70:     else {return (void *)left_type;}
lbessard@70:   }
lbessard@70: 
lbessard@70:   /* A helper function... */
lbessard@70:   void *compute_numeric_expression(symbol_c *left_type, symbol_c *right_type) {
lbessard@70:     if (!is_same_type(left_type, right_type))
lbessard@70:       ERROR;
lbessard@70:     if (!is_integer_type(left_type) && !is_real_type(left_type))
lbessard@70:       ERROR;
lbessard@70:     if ((typeid(*left_type) == typeid(constant_int_type_name_c)) || (typeid(*left_type) == typeid(constant_real_type_name_c))) {return (void *)right_type;}
lbessard@70:     else {return (void *)left_type;}
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70: 
lbessard@70:   /* a helper function... */
lbessard@70:   symbol_c *base_type(symbol_c *symbol) {
lbessard@70:     return (symbol_c *)symbol->accept(search_base_type);
lbessard@70:   }
lbessard@70: 
lbessard@70: /*********************/
lbessard@70: /* B 1.4 - Variables */
lbessard@70: /*********************/
lbessard@70: 
lbessard@70:   void *visit(symbolic_variable_c *symbol) {
lbessard@70:     symbol_c *res;
lbessard@70:     
lbessard@70:     /* Nope, now we assume it is a variable, and determine its type... */
lbessard@70:     res = search_varfb_instance_type->get_type(symbol);
lbessard@70:     if (NULL != res) return res;
lbessard@70:     
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70: 
lbessard@70: /*************************************/
lbessard@70: /* B 1.4.2 - Multi-element variables */
lbessard@70: /*************************************/
lbessard@70: 
lbessard@70:   void *visit(array_variable_c *symbol) {
lbessard@70:     symbol_c *res;
lbessard@70:     
lbessard@70:     /* Nope, now we assume it is a variable, and determine its type... */
lbessard@70:     res = search_varfb_instance_type->get_type(symbol);
lbessard@70:     if (NULL != res) return res;
lbessard@70:     
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70: 
lbessard@70:   void *visit(structured_variable_c *symbol) {
lbessard@70:     symbol_c *res;
lbessard@70:     
lbessard@70:     /* Nope, now we assume it is a variable, and determine its type... */
lbessard@70:     res = search_varfb_instance_type->get_type(symbol);
lbessard@70:     if (NULL != res) return res;
lbessard@70:     
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70: 
lbessard@70: /***************************************/
lbessard@70: /* B.3 - Language ST (Structured Text) */
lbessard@70: /***************************************/
lbessard@70: /***********************/
lbessard@70: /* B 3.1 - Expressions */
lbessard@70: /***********************/
lbessard@70:   void *visit(or_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     return compute_boolean_expression(left_type, right_type);
lbessard@70:   }
lbessard@70: 
lbessard@70:   void *visit(xor_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     return compute_boolean_expression(left_type, right_type);
lbessard@70:   }
lbessard@70: 
lbessard@70:   void *visit(and_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     return compute_boolean_expression(left_type, right_type); 
lbessard@70:   }
lbessard@70: 
lbessard@70:   void *visit(equ_expression_c *symbol) {return (void *)&bool_type_name;}
lbessard@70:   void *visit(notequ_expression_c *symbol) {return (void *)&bool_type_name;}
lbessard@70:   void *visit(lt_expression_c *symbol) {return (void *)&bool_type_name;}
lbessard@70:   void *visit(gt_expression_c *symbol) {return (void *)&bool_type_name;}
lbessard@70:   void *visit(le_expression_c *symbol) {return (void *)&bool_type_name;}
lbessard@70:   void *visit(ge_expression_c *symbol) {return (void *)&bool_type_name;}
lbessard@70: 
lbessard@70:   void *visit(add_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;}
lbessard@70:     if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;}
lbessard@70:     if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;}
lbessard@70:     return compute_numeric_expression(left_type, right_type);
lbessard@70:   }
lbessard@70: 
lbessard@70:   void *visit(sub_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;}
lbessard@70:     if (typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c)) {return (void *)&time_type_name;}
lbessard@70:     if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;}
lbessard@70:     if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c)) {return (void *)&time_type_name;}
lbessard@70:     if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;}
lbessard@70:     if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c)) {return (void *)&time_type_name;}
lbessard@70:     return compute_numeric_expression(left_type, right_type);
lbessard@70:   }
lbessard@70:   
lbessard@70:   void *visit(mul_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     if (typeid(*left_type) == typeid(time_type_name_c) && is_num_type(right_type)) {
lbessard@70:         return (void *)&time_type_name;
lbessard@70:     }
lbessard@70:     return compute_numeric_expression(left_type, right_type);
lbessard@70:   }
lbessard@70:   
lbessard@70:   void *visit(div_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     if (typeid(*left_type) == typeid(time_type_name_c) && is_num_type(right_type)){
lbessard@70:         return (void *)&time_type_name;
lbessard@70:     }
lbessard@70:     return compute_numeric_expression(left_type, right_type);
lbessard@70:   }
lbessard@70: 
lbessard@70:   void *visit(mod_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     return compute_numeric_expression(left_type, right_type);
lbessard@70:   }
lbessard@70: 
lbessard@70:   void *visit(power_expression_c *symbol) {
lbessard@70:     symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
lbessard@70:     symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
lbessard@70:     if (is_real_type(left_type) && is_num_type(right_type)) {
lbessard@70:         return (void *)left_type;
lbessard@70:     }
lbessard@70:     ERROR;
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70:   
lbessard@70:   void *visit(neg_expression_c *symbol) {
lbessard@70:     symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this));
lbessard@70:     if (is_num_type(exp_type) || typeid(*exp_type) == typeid(time_type_name_c)){
lbessard@70:             return (void *)exp_type;
lbessard@70:          }
lbessard@70:     ERROR;
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70:   
lbessard@70:   void *visit(not_expression_c *symbol) {
lbessard@70:     symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this));
lbessard@70:     return compute_boolean_expression(exp_type, exp_type);
lbessard@70:   }
lbessard@70:   
lbessard@70:   void *visit(function_invocation_c *symbol) {
lbessard@70: 	  function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
lbessard@70: 	
lbessard@70: 	  if (f_decl == function_symtable.end_value()) {
lbessard@70:       void *res = compute_standard_function_st(symbol);
lbessard@70: 	    if (res == NULL)
lbessard@70:         ERROR;
lbessard@70:       return res;
lbessard@70:     }
lbessard@70: 
lbessard@70:     return base_type(f_decl->type_name);
lbessard@70:   }
lbessard@70: 
lbessard@70: };
lbessard@70: 
lbessard@70: /*bool_type_name_c     search_expression_type_c::bool_type_name;*/
lbessard@70: