diff -r 64334c5a00b1 -r 38d6eb056260 stage4/generate_c/search_expression_type.cc
--- a/stage4/generate_c/search_expression_type.cc	Sat May 30 16:42:41 2009 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,386 +0,0 @@
-/*
- * (c) 2003 Mario de Sousa
- *
- * Offered to the public under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
- * Public License for more details.
- *
- * This code is made available on the understanding that it will not be
- * used in safety-critical situations without a full and competent review.
- */
-
-/*
- * An IEC 61131-3 IL and ST compiler.
- *
- * Based on the
- * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
- *
- */
-
-
-/* Determine the data type of an ST expression.
- * A reference to the relevant type definition is returned.
- *
- * For example:
- *       2 + 3       -> returns reference to a int_type_name_c object.
- *       22.2 - 5    -> returns reference to a real_type_name_c object.
- *       etc...
- */
-
-#include "function_type_decl.h"
-#include "get_function_type_decl.c"
-
-#if 0
-typedef enum {function_add,
-              function_sub,
-              function_and,
-              function_or,
-              function_sqrt,
-              function_none} function_type_t;
-
-
-function_type_t get_function_type(identifier_c *function_name) {
-  if (!strcasecmp(function_name->value, "ADD"))
-    return function_add;
-  else if (!strcasecmp(function_name->value, "SUB"))
-    return function_sub;
-  else if (!strcasecmp(function_name->value, "AND"))
-    return function_and;
-  else if (!strcasecmp(function_name->value, "OR"))
-    return function_or;
-  else if (!strcasecmp(function_name->value, "SQRT"))
-    return function_sqrt;
-  else return function_none;
-}
-#endif
-
-
-symbol_c *generate_param_name(const char *name) {
-  symbol_c *param_name = new identifier_c(name);
-  return param_name;
-}
-
-
-symbol_c *generate_param_name(const char *format, int number) {
-  char name[10];
-  sprintf(name, format, number);
-  symbol_c *param_name = new identifier_c(name);
-  return param_name;
-}
-
-
-class search_expression_type_c: public search_constant_type_c {
-  private:
-    search_varfb_instance_type_c *search_varfb_instance_type;
-    search_base_type_c search_base_type;
-
-  public:
-    search_expression_type_c(symbol_c *search_scope) {
-      search_varfb_instance_type = new search_varfb_instance_type_c(search_scope);
-    }
-
-    virtual ~search_expression_type_c(void) {
-      delete search_varfb_instance_type;
-    }
-
-    /* A helper function... */
-    bool is_bool_type(symbol_c *type_symbol) {
-      if (type_symbol == NULL) {return true;}
-      return (typeid(*type_symbol) == typeid(bool_type_name_c));
-    }
-
-    /* A helper function... */
-    bool is_time_type(symbol_c *type_symbol) {
-      if (type_symbol == NULL) {return true;}
-      if (typeid(*type_symbol) == typeid(time_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(date_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(tod_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(dt_type_name_c)) {return true;}
-      return false;
-    }
-
-    /* A helper function... */
-    bool is_string_type(symbol_c *type_symbol) {
-      if (type_symbol == NULL) {return true;}
-      if (typeid(*type_symbol) == typeid(string_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(wstring_type_name_c)) {return true;}
-      return false;
-    }
-
-    /* A helper function... */
-    bool is_integer_type(symbol_c *type_symbol) {
-      if (type_symbol == NULL) {return true;}
-      if (typeid(*type_symbol) == typeid(sint_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(int_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(dint_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(lint_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(usint_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(uint_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(udint_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(ulint_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(constant_int_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(direct_variable_type_name_c)) {return true;}
-      return false;
-    }
-
-    bool is_real_type(symbol_c *type_symbol) {
-      if (type_symbol == NULL) {return true;}
-      if (typeid(*type_symbol) == typeid(real_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(lreal_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(constant_real_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(direct_variable_type_name_c)) {return true;}
-      return false;
-    }
-
-    bool is_num_type(symbol_c *type_symbol) {
-      if (type_symbol == NULL) {return true;}
-      return is_real_type(type_symbol) || is_integer_type(type_symbol);
-    }
-
-    bool is_nbinary_type(symbol_c *type_symbol) {
-      if (type_symbol == NULL) {return true;}
-      if (typeid(*type_symbol) == typeid(byte_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(word_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(dword_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(lword_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(constant_int_type_name_c)) {return true;}
-      if (typeid(*type_symbol) == typeid(direct_variable_type_name_c)) {return true;}
-      return false;
-    }
-
-    bool is_binary_type(symbol_c *type_symbol) {
-      if (type_symbol == NULL) {return true;}
-      if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;}
-      return is_nbinary_type(type_symbol);
-    }
-    
-    bool is_same_type(symbol_c *first_type, symbol_c *second_type) {
-      if (first_type == NULL || second_type == NULL) {return true;}
-      if (typeid(*first_type) == typeid(*second_type)) {return true;}
-      if (is_integer_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return true;}
-      if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_integer_type(second_type))) {return true;}
-      if (is_binary_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c))) {return true;}
-      if ((typeid(*first_type) == typeid(constant_int_type_name_c) && is_binary_type(second_type))) {return true;}
-      if (is_real_type(first_type) && (typeid(*second_type) == typeid(constant_real_type_name_c))) {return true;}
-      if ((typeid(*first_type) == typeid(constant_real_type_name_c) && is_real_type(second_type))) {return true;}
-      if (typeid(*first_type) == typeid(direct_variable_type_name_c)) {return true;}
-      if (typeid(*second_type) == typeid(direct_variable_type_name_c)) {return true;}
-      return false;
-    }
-
-    symbol_c* common_type(symbol_c *first_type, symbol_c *second_type) {
-      if (first_type == NULL && second_type == NULL) {return NULL;}
-      if (first_type == NULL) {return second_type;}
-      if (second_type == NULL) {return first_type;}
-      if (typeid(*first_type) == typeid(*second_type)) {return first_type;}
-      if (is_integer_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c) || typeid(*second_type) == typeid(direct_variable_type_name_c))) {return first_type;}
-      if ((typeid(*first_type) == typeid(constant_int_type_name_c) || typeid(*second_type) == typeid(direct_variable_type_name_c)) && is_integer_type(second_type)) {return second_type;}
-      if (is_binary_type(first_type) && (typeid(*second_type) == typeid(constant_int_type_name_c) || typeid(*second_type) == typeid(direct_variable_type_name_c))) {return first_type;}
-      if ((typeid(*first_type) == typeid(constant_int_type_name_c) || typeid(*second_type) == typeid(direct_variable_type_name_c)) && is_binary_type(second_type)) {return second_type;}
-      if (is_real_type(first_type) && (typeid(*second_type) == typeid(constant_real_type_name_c) || typeid(*second_type) == typeid(direct_variable_type_name_c))) {return first_type;}
-      if ((typeid(*first_type) == typeid(constant_real_type_name_c) || typeid(*second_type) == typeid(direct_variable_type_name_c)) && is_real_type(second_type)) {return second_type;}
-      return NULL;
-    }
-
-#include "search_type_code.c"
-
-  /*static bool_type_name_c bool_type_name;*/
-
-  /* A helper function... */
-  void *compute_boolean_expression(symbol_c *left_type, symbol_c *right_type) {
-    if (!is_same_type(left_type, right_type))
-      ERROR;
-    if (!is_bool_type(left_type) && !is_binary_type(left_type))
-      ERROR;
-    if (typeid(*left_type) == typeid(constant_int_type_name_c)) {return (void *)right_type;}
-    else {return (void *)left_type;}
-  }
-
-  /* A helper function... */
-  void *compute_numeric_expression(symbol_c *left_type, symbol_c *right_type) {
-    if (!is_same_type(left_type, right_type))
-      ERROR;
-    if (!is_integer_type(left_type) && !is_real_type(left_type))
-      ERROR;
-    if ((typeid(*left_type) == typeid(constant_int_type_name_c)) || (typeid(*left_type) == typeid(constant_real_type_name_c))) {return (void *)right_type;}
-    else {return (void *)left_type;}
-    return NULL;
-  }
-
-  /* a helper function... */
-  symbol_c *base_type(symbol_c *symbol) {
-    return (symbol_c *)symbol->accept(search_base_type);
-  }
-
-/*********************/
-/* B 1.4 - Variables */
-/*********************/
-
-  void *visit(symbolic_variable_c *symbol) {
-    symbol_c *res;
-    
-    /* Nope, now we assume it is a variable, and determine its type... */
-    res = search_varfb_instance_type->get_type(symbol);
-    if (NULL != res) return res;
-    
-    return NULL;
-  }
-
-/********************************************/
-/* B 1.4.1 - Directly Represented Variables */
-/********************************************/
-	void *visit(direct_variable_c *symbol) {
-	  switch (symbol->value[2]) {
-	  	case 'X': // bit
-	  	  return (void *)&bool_type_name;
-	  	default:
-	  	  return (void *)&direct_variable_type_name;
-	  }
-	}
-
-/*************************************/
-/* B 1.4.2 - Multi-element variables */
-/*************************************/
-
-  void *visit(array_variable_c *symbol) {
-    symbol_c *res;
-    
-    /* Nope, now we assume it is a variable, and determine its type... */
-    res = search_varfb_instance_type->get_type(symbol);
-    if (NULL != res) return res;
-    
-    return NULL;
-  }
-
-  void *visit(structured_variable_c *symbol) {
-    symbol_c *res;
-    
-    /* Nope, now we assume it is a variable, and determine its type... */
-    res = search_varfb_instance_type->get_type(symbol);
-    if (NULL != res) return res;
-    
-    return NULL;
-  }
-
-/***************************************/
-/* B.3 - Language ST (Structured Text) */
-/***************************************/
-/***********************/
-/* B 3.1 - Expressions */
-/***********************/
-  void *visit(or_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    return compute_boolean_expression(left_type, right_type);
-  }
-
-  void *visit(xor_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    return compute_boolean_expression(left_type, right_type);
-  }
-
-  void *visit(and_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    return compute_boolean_expression(left_type, right_type); 
-  }
-
-  void *visit(equ_expression_c *symbol) {return (void *)&bool_type_name;}
-  void *visit(notequ_expression_c *symbol) {return (void *)&bool_type_name;}
-  void *visit(lt_expression_c *symbol) {return (void *)&bool_type_name;}
-  void *visit(gt_expression_c *symbol) {return (void *)&bool_type_name;}
-  void *visit(le_expression_c *symbol) {return (void *)&bool_type_name;}
-  void *visit(ge_expression_c *symbol) {return (void *)&bool_type_name;}
-
-  void *visit(add_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;}
-    if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;}
-    if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;}
-    return compute_numeric_expression(left_type, right_type);
-  }
-
-  void *visit(sub_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;}
-    if (typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c)) {return (void *)&time_type_name;}
-    if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;}
-    if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c)) {return (void *)&time_type_name;}
-    if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;}
-    if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c)) {return (void *)&time_type_name;}
-    return compute_numeric_expression(left_type, right_type);
-  }
-  
-  void *visit(mul_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    if (typeid(*left_type) == typeid(time_type_name_c) && is_num_type(right_type)) {
-        return (void *)&time_type_name;
-    }
-    return compute_numeric_expression(left_type, right_type);
-  }
-  
-  void *visit(div_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    if (typeid(*left_type) == typeid(time_type_name_c) && is_num_type(right_type)){
-        return (void *)&time_type_name;
-    }
-    return compute_numeric_expression(left_type, right_type);
-  }
-
-  void *visit(mod_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    return compute_numeric_expression(left_type, right_type);
-  }
-
-  void *visit(power_expression_c *symbol) {
-    symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
-    symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
-    if (is_real_type(left_type) && is_num_type(right_type)) {
-        return (void *)left_type;
-    }
-    ERROR;
-    return NULL;
-  }
-  
-  void *visit(neg_expression_c *symbol) {
-    symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this));
-    if (is_num_type(exp_type) || typeid(*exp_type) == typeid(time_type_name_c)){
-        return (void *)exp_type;
-    }
-    ERROR;
-    return NULL;
-  }
-  
-  void *visit(not_expression_c *symbol) {
-    symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this));
-    return compute_boolean_expression(exp_type, exp_type);
-  }
-  
-  void *visit(function_invocation_c *symbol) {
-	  function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name);
-	
-	  if (f_decl == function_symtable.end_value()) {
-      void *res = compute_standard_function_default(symbol);
-	    if (res == NULL)
-        ERROR;
-      return res;
-    }
-
-    return base_type(f_decl->type_name);
-  }
-
-};
-
-/*bool_type_name_c     search_expression_type_c::bool_type_name;*/
-