diff -r 41cb5b80416e -r e1f0ebd2d9ec stage4/generate_c/search_expression_type.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage4/generate_c/search_expression_type.cc	Wed Oct 24 17:39:51 2007 +0200
@@ -0,0 +1,494 @@
+/*
+ * (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) {
+      return (typeid(*type_symbol) == typeid(bool_type_name_c));
+    }
+
+    /* A helper function... */
+    bool is_time_type(symbol_c *type_symbol) {
+      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_integer_type(symbol_c *type_symbol) {
+      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;}
+      return false;
+    }
+
+    bool is_real_type(symbol_c *type_symbol) {
+      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;}
+      return false;
+    }
+
+    bool is_num_type(symbol_c *type_symbol) {
+      return is_real_type(type_symbol) || is_integer_type(type_symbol);
+    }
+
+    bool is_nbinary_type(symbol_c *type_symbol) {
+      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;}
+      return false;
+    }
+
+    bool is_binary_type(symbol_c *type_symbol) {
+      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 (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;}
+      return false;
+    }
+
+    symbol_c* common_type(symbol_c *first_type, symbol_c *second_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))) {return first_type;}
+      if ((typeid(*first_type) == typeid(constant_int_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))) {return first_type;}
+      if ((typeid(*first_type) == typeid(constant_int_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))) {return first_type;}
+      if ((typeid(*first_type) == typeid(constant_real_type_name_c) && is_real_type(second_type))) {return second_type;}
+      return NULL;
+    }
+
+#include "search_type_code.c"
+
+#if 0
+  void *compute_standard_function_st(function_invocation_c *symbol) {
+    symbol_c *current_type = NULL;
+    symbol_c *return_type = NULL;
+
+    function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
+    function_call_param_iterator_c function_call_param_iterator(symbol);
+    search_expression_type_c* search_expression_type = this;
+    
+    for(int current_param = 0; current_param < ((list_c *)symbol->parameter_assignment_list)->n; current_param++) {
+      symbol_c *param_name = NULL;
+      switch (current_function_type) {
+        case function_add:
+        case function_and:
+        case function_or:
+          param_name = generate_param_name("IN%d", current_param + 1);
+          break;
+        case function_sub:
+          if (current_param < 2)
+            param_name = generate_param_name("IN%d", current_param + 1);
+          else ERROR;
+          break;
+        default: ERROR;
+      }
+      
+      /* Get the value from a foo(<param_name> = <param_value>) style call */
+      symbol_c *param_value = function_call_param_iterator.search(param_name);
+      delete param_name;
+      
+      /* Get the value from a foo(<param_value>) style call */
+      if (param_value == NULL)
+        param_value = function_call_param_iterator.next();
+      
+      if (param_value == NULL) ERROR;
+      
+      symbol_c *param_type = (symbol_c *)param_value->accept(*this);
+      
+      switch (current_function_type) {
+        case function_add:
+          if (current_param == 0)
+            current_type = param_type;
+          else if (current_param == 1) {
+            if ((is_integer_type(current_type) && is_same_type(current_type, param_type)) ||
+                (is_real_type(current_type) && is_same_type(current_type, param_type))) {
+              current_type = common_type(current_type, param_type);
+              return_type = current_type;
+            }
+            else if (is_time_type(current_type)) {
+              if ((typeid(*current_type) == typeid(time_type_name_c)) && (typeid(*param_type) == typeid(time_type_name_c))) {return_type = (symbol_c *)&time_type_name;}
+              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;}
+              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;}
+              else ERROR;
+            }
+            else ERROR;
+          }
+          else if (!is_time_type(current_type) && is_same_type(current_type, param_type)) {
+            current_type = common_type(current_type, param_type);
+            return_type = current_type;
+          }
+          else ERROR;
+          break;
+        case function_sub:
+          if (current_param == 0)
+            current_type = param_type;
+          else if (current_param == 1) {
+            if ((is_integer_type(current_type) && is_same_type(current_type, param_type)) ||
+                (is_real_type(current_type) && is_same_type(current_type, param_type)))
+              return_type = common_type(current_type, param_type);
+            else if (is_time_type(current_type)) {
+              if (typeid(*current_type) == typeid(time_type_name_c) && typeid(*param_type) == typeid(time_type_name_c)) {return_type = (symbol_c *)&time_type_name;}
+              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;}
+              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;}
+              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;}
+              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;}
+              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;}
+              else ERROR;
+            }
+            else ERROR;
+          }
+          else ERROR;
+          break;
+        case function_and:
+        case function_or:
+          if (current_param == 0)
+            if (is_binary_type(param_type))
+              current_type = param_type;
+            else ERROR;
+          else if (is_same_type(current_type, param_type))
+            return_type = common_type(current_type, param_type);
+          else ERROR;
+          break;
+        default: ERROR;
+      }
+    }
+    return (void *)return_type;
+  }
+
+  void *compute_standard_function_il(il_function_call_c *symbol, symbol_c *param_type) {
+    /*symbol_c *current_type = NULL;*/
+    symbol_c *return_type = NULL;
+    function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
+    if (current_function_type == function_none) ERROR;
+    
+    function_call_param_iterator_c function_call_param_iterator(symbol);
+    
+    int nb_param = 1;
+    if (symbol->il_operand_list != NULL)
+      nb_param += ((list_c *)symbol->il_operand_list)->n;
+
+    for(int current_param = 0; current_param < nb_param; current_param++) {
+      
+      if (current_param != 0) {
+        symbol_c *param_name = NULL;
+        switch (current_function_type) {
+          default: ERROR;
+        }
+        
+        /* Get the value from a foo(<param_name> = <param_value>) style call */
+        symbol_c *param_value = function_call_param_iterator.search(param_name);
+        delete param_name;
+        
+        /* Get the value from a foo(<param_value>) style call */
+        if (param_value == NULL)
+          param_value = function_call_param_iterator.next();
+        
+        if (param_value == NULL) ERROR;
+        
+        param_type = (symbol_c *)param_value->accept(*this);
+      }
+      
+      switch (current_function_type) {
+        case function_sqrt:
+          if (current_param == 0 && is_real_type(param_type))
+            return_type = param_type;
+          else ERROR;
+          break;
+        default: ERROR;
+      }
+    }
+    
+    return (void *)return_type;
+  }
+#endif
+
+  /*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 1.4.2 - 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_st(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;*/
+