diff -r 64334c5a00b1 -r 38d6eb056260 absyntax_utils/search_expression_type.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/absyntax_utils/search_expression_type.cc	Mon Jun 01 21:08:44 2009 +0200
@@ -0,0 +1,344 @@
+/*
+ * (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 "absyntax_utils.hh"
+#include <typeinfo>
+
+search_expression_type_c::search_expression_type_c(symbol_c *search_scope) {
+  search_varfb_instance_type = new search_varfb_instance_type_c(search_scope);
+}
+
+search_expression_type_c::~search_expression_type_c(void) {
+  delete search_varfb_instance_type;
+}
+
+/* A helper function... */
+bool search_expression_type_c::is_bool_type(symbol_c *type_symbol) {
+  bool_type_name_c tt;
+  if (type_symbol == NULL) {return true;}
+  return (typeid(*type_symbol) == typeid(bool_type_name_c));
+}
+
+/* A helper function... */
+bool search_expression_type_c::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 search_expression_type_c::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 search_expression_type_c::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 search_expression_type_c::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 search_expression_type_c::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 search_expression_type_c::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 search_expression_type_c::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 search_expression_type_c::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* search_expression_type_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;
+}
+
+#define compute_standard_function_default search_expression_type_c::compute_standard_function_default
+#define compute_standard_function_il search_expression_type_c::compute_standard_function_il
+#include "search_type_code.c"
+#undef compute_standard_function_default
+#undef compute_standard_function_il
+
+/*static bool_type_name_c bool_type_name;*/
+
+/* A helper function... */
+void *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::base_type(symbol_c *symbol) {
+  return (symbol_c *)symbol->accept(search_base_type);
+}
+
+/*********************/
+/* B 1.4 - Variables */
+/*********************/
+
+void *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::visit(equ_expression_c *symbol) {return (void *)&bool_type_name;}
+void *search_expression_type_c::visit(notequ_expression_c *symbol) {return (void *)&bool_type_name;}
+void *search_expression_type_c::visit(lt_expression_c *symbol) {return (void *)&bool_type_name;}
+void *search_expression_type_c::visit(gt_expression_c *symbol) {return (void *)&bool_type_name;}
+void *search_expression_type_c::visit(le_expression_c *symbol) {return (void *)&bool_type_name;}
+void *search_expression_type_c::visit(ge_expression_c *symbol) {return (void *)&bool_type_name;}
+
+void *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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 *search_expression_type_c::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;*/
+