diff -r 41cb5b80416e -r e1f0ebd2d9ec stage4/generate_c/generate_c_st.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage4/generate_c/generate_c_st.cc	Wed Oct 24 17:39:51 2007 +0200
@@ -0,0 +1,847 @@
+/*
+ * (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)
+ *
+ */
+
+
+/*
+ * Conversion of st statements (i.e. ST code).
+ *
+ * This is part of the 4th stage that generates
+ * a c++ source program equivalent to the IL and ST
+ * code.
+ */
+
+
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+
+
+class generate_c_st_c: public generate_c_typedecl_c {
+
+  private:
+    /* When calling a function block, we must first find it's type,
+     * by searching through the declarations of the variables currently
+     * in scope.
+     * This class does just that...
+     * A new class is instantiated whenever we begin generating the code
+     * for a function block type declaration, or a program declaration.
+     * This object instance will then later be called while the
+     * function block's or the program's body is being handled.
+     *
+     * Note that functions cannot contain calls to function blocks,
+     * so we do not create an object instance when handling
+     * a function declaration.
+     */
+    search_fb_instance_decl_c *search_fb_instance_decl;
+
+    /* When compiling st code, it becomes necessary to determine the
+     * data type of st expressions. To do this, we must first find the
+     * st operand's declaration, within the scope of the function block
+     * or function currently being processed.
+     * The following object does just that...
+     * This object instance will then later be called while the
+     * remaining st code is being handled.
+     */
+    search_expression_type_c *search_expression_type;
+
+    search_varfb_instance_type_c *search_varfb_instance_type;
+
+  public:
+    generate_c_st_c(stage4out_c *s4o_ptr, symbol_c *scope, const char *variable_prefix = NULL)
+    : generate_c_typedecl_c(s4o_ptr) {
+      search_fb_instance_decl = new search_fb_instance_decl_c(scope);
+      search_expression_type = new search_expression_type_c(scope);
+      search_varfb_instance_type = new search_varfb_instance_type_c(scope);
+      this->set_variable_prefix(variable_prefix);
+    }
+
+    virtual ~generate_c_st_c(void) {
+      delete search_fb_instance_decl;
+      delete search_expression_type;
+      delete search_varfb_instance_type;
+    }
+
+
+  private:
+    /* Some function calls in the body of functions or function blocks
+     * may leave some parameters to their default values, and
+     * ignore some output parameters of the function being called.
+     * Our conversion of ST functions to C++ does not contemplate that,
+     * i.e. each called function must get all it's input and output
+     * parameters set correctly.
+     * For input parameters we merely need to call the function with
+     * the apropriate default value, but for output parameters
+     * we must create temporary variables to hold the output value.
+     *
+     * We declare all the temporary output variables at the begining of
+     * the body of each function or function block, and use them as
+     * in function calls later on as they become necessary...
+     * Note that we cannot create these variables just before a function
+     * call, as the function call itself may be integrated within an
+     * expression, or another function call!
+     *
+     * The variables are declared in the exact same order in which they
+     * will be used later on during the function calls, which allows us
+     * to simply re-create the name that was used for the temporary variable
+     * instead of keeping it in some list.
+     * The names are recreated by the temp_var_name_factory, after reset()
+     * has been called!
+     *
+     * This function will genertae code similar to...
+     *
+     *     INT __TMP_0 = 23;
+     *     REAL __TMP_1 = 45.5;
+     *     ...
+     */
+    temp_var_name_c temp_var_name_factory;
+
+  public:
+    void generate(statement_list_c *stl) {
+      generate_c_tempvardecl_c generate_c_tempvardecl(&s4o);
+      generate_c_tempvardecl.generate(stl, &temp_var_name_factory);
+      stl->accept(*this);
+    }
+
+  private:
+
+/*********************/
+/* B 1.4 - Variables */
+/*********************/
+void *visit(symbolic_variable_c *symbol) {
+  unsigned int vartype = search_varfb_instance_type->get_vartype(symbol);
+  if (vartype == search_var_instance_decl_c::external_vt || vartype == search_var_instance_decl_c::located_vt) {
+    s4o.print("*(");
+    generate_c_base_c::visit(symbol);
+    s4o.print(")");
+  }
+  else {
+    generate_c_base_c::visit(symbol);
+  }
+  return NULL;
+}
+
+/********************************************/
+/* B.1.4.1   Directly Represented Variables */
+/********************************************/
+// direct_variable: direct_variable_token   {$$ = new direct_variable_c($1);};
+void *visit(direct_variable_c *symbol) {
+  TRACE("direct_variable_c");
+  /* Do not use print_token() as it will change everything into uppercase */
+  if (strlen(symbol->value) == 0) ERROR;
+  s4o.print("*(");
+  this->print_variable_prefix();
+  s4o.printlocation(symbol->value + 1);
+  s4o.print(")");
+  return NULL;
+}
+
+/***************************************/
+/* B.3 - Language ST (Structured Text) */
+/***************************************/
+/***********************/
+/* B 3.1 - Expressions */
+/***********************/
+void *visit(or_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_bool_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " || ");
+  if (search_expression_type->is_binary_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " | ");
+  ERROR;
+  return NULL;
+}
+
+void *visit(xor_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_bool_type(left_type)) {
+    s4o.print("(");
+    symbol->l_exp->accept(*this);
+    s4o.print(" && !");
+    symbol->r_exp->accept(*this);
+    s4o.print(") || (!");
+    symbol->l_exp->accept(*this);
+    s4o.print(" && ");
+    symbol->r_exp->accept(*this);
+    s4o.print(")");
+  }
+  if (search_expression_type->is_binary_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " ^ ");
+  ERROR;
+  return NULL;
+}
+
+void *visit(and_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_bool_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " && ");
+  if (search_expression_type->is_binary_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " & ");
+  ERROR;
+  return NULL;
+}
+
+void *visit(equ_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_time_type(left_type))
+    return print_compare_function("__eq_", left_type, symbol->l_exp, symbol->r_exp);
+  return print_binary_expression(symbol->l_exp, symbol->r_exp, " == ");
+}
+
+void *visit(notequ_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_time_type(left_type))
+    return print_compare_function("__ne_", left_type, symbol->l_exp, symbol->r_exp);
+  return print_binary_expression(symbol->l_exp, symbol->r_exp, " != ");
+}
+
+void *visit(lt_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_time_type(left_type))
+    return print_compare_function("__lt_", left_type, symbol->l_exp, symbol->r_exp);
+  return print_binary_expression(symbol->l_exp, symbol->r_exp, " < ");
+}
+
+void *visit(gt_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_time_type(left_type))
+    return print_compare_function("__gt_", left_type, symbol->l_exp, symbol->r_exp);
+  return print_binary_expression(symbol->l_exp, symbol->r_exp, " > ");
+}
+
+void *visit(le_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_time_type(left_type))
+    return print_compare_function("__le_", left_type, symbol->l_exp, symbol->r_exp);
+  return print_binary_expression(symbol->l_exp, symbol->r_exp, " <= ");
+}
+
+void *visit(ge_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_time_type(left_type))
+    return print_compare_function("__ge_", left_type, symbol->l_exp, symbol->r_exp);
+  return print_binary_expression(symbol->l_exp, symbol->r_exp, " >= ");
+}
+
+void *visit(add_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+	symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+	if ((typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
+      (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
+      (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)))
+    return print_binary_function("__time_add", symbol->l_exp, symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " + ");
+  ERROR;
+  return NULL;
+}
+
+void *visit(sub_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if ((typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
+      (typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c)) ||
+      (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
+      (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c)) ||
+      (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) ||
+      (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c)))
+    return print_binary_function("__time_sub", symbol->l_exp, symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " - ");
+  ERROR;
+  return NULL;
+}
+
+void *visit(mul_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if ((typeid(*left_type) == typeid(time_type_name_c) && search_expression_type->is_integer_type(right_type)) ||
+      (typeid(*left_type) == typeid(time_type_name_c) && search_expression_type->is_real_type(right_type)))
+    return print_binary_function("__time_mul", symbol->l_exp, symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " * ");
+  ERROR;
+  return NULL;
+}
+
+void *visit(div_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type))
+    return print_binary_expression(symbol->l_exp, symbol->r_exp, " / ");
+  ERROR;
+  return NULL;
+}
+
+void *visit(mod_expression_c *symbol) {
+  symbol_c *left_type = search_expression_type->get_type(symbol->l_exp);
+  symbol_c *right_type = search_expression_type->get_type(symbol->r_exp);
+  if (!search_expression_type->is_same_type(left_type, right_type))
+      ERROR;
+  if (search_expression_type->is_integer_type(left_type) || search_expression_type->is_real_type(left_type)) {
+    s4o.print("((");
+    symbol->r_exp->accept(*this);
+    s4o.print(" == 0)?0:");
+    print_binary_expression(symbol->l_exp, symbol->r_exp, " % ");
+    s4o.print(")");
+    return NULL;
+  }
+  ERROR;
+  return NULL;
+}
+
+/* TODO: power expression... */
+void *visit(power_expression_c *symbol) {ERROR; return print_binary_expression(symbol->l_exp, symbol->r_exp, " ** ");}
+void *visit(neg_expression_c *symbol) {return print_unary_expression(symbol->exp, " -");}
+
+void *visit(not_expression_c *symbol) {
+  symbol_c *exp_type = search_expression_type->get_type(symbol->exp);
+  if (!search_expression_type->is_binary_type(exp_type))
+     ERROR;
+  return print_unary_expression(symbol->exp, search_expression_type->is_bool_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()) {
+    /* The function called is not in the symtable, so we test if it is a
+     * standard function defined in standard */
+    
+    function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
+    if (current_function_type == function_none) ERROR;
+    
+    symbol_c *function_return_type = search_expression_type->get_type(symbol);
+    
+    function_call_param_iterator_c function_call_param_iterator(symbol);
+    
+    int nb_param = ((list_c *)symbol->parameter_assignment_list)->n;
+
+#include "st_code_gen.c"
+
+#if 0
+    for(int current_param = 0; current_param < nb_param; 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;
+      
+      switch (current_function_type) {
+        case function_add:
+          if (search_expression_type->is_time_type(function_return_type)) {
+            if (current_param == 0) {
+              s4o.print("__time_add(");
+              param_value->accept(*this);
+            }
+            else if (current_param == 1) {
+              s4o.print(", ");
+              param_value->accept(*this);
+              s4o.print(")");
+            }
+            else ERROR;
+          }
+          else {
+            if (current_param == 0)
+              s4o.print("(");
+            else
+              s4o.print(" + ");
+            param_value->accept(*this);
+            if (current_param == nb_param - 1)
+              s4o.print(")");
+          }
+          break;
+        case function_sub:
+          if (search_expression_type->is_time_type(function_return_type)) {
+            if (current_param == 0) {
+              s4o.print("__time_sub(");
+              param_value->accept(*this);
+            }
+            else if (current_param == 1) {
+              s4o.print(", ");
+              param_value->accept(*this);
+              s4o.print(")");
+            }
+            else ERROR;
+          }
+          else {
+            if (current_param == 0) {
+              s4o.print("(");
+              param_value->accept(*this);
+            }
+            else if (current_param == 1) {
+              s4o.print(" - ");
+              param_value->accept(*this);
+              s4o.print(")");
+            }
+            else ERROR;
+          }
+          break;
+        case function_and:
+          if (current_param == 0)
+            s4o.print("(");
+          else
+            if (search_expression_type->is_bool_type(function_return_type))
+              s4o.print(" && ");
+            else
+              s4o.print(" & ");
+          param_value->accept(*this);
+          if (current_param == nb_param - 1)
+            s4o.print(")");
+          break;
+        case function_or:
+          if (current_param == 0)
+            s4o.print("(");
+          else
+            if (search_expression_type->is_bool_type(function_return_type))
+              s4o.print(" || ");
+            else
+              s4o.print(" | ");
+          param_value->accept(*this);
+          if (current_param == nb_param - 1)
+            s4o.print(")");
+          break;
+        default: ERROR;
+      }
+    } /* for(...) */
+#endif
+  }
+  else {
+    /* loop through each function parameter, find the value we should pass
+     * to it, and then output the c equivalent...
+     */
+    function_param_iterator_c fp_iterator(f_decl);
+  
+    symbol->function_name->accept(*this);
+    s4o.print("(");
+    s4o.indent_right();
+  
+    identifier_c *param_name;
+    function_call_param_iterator_c function_call_param_iterator(symbol);
+    for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
+      if (i != 1)
+        s4o.print(",\n"+s4o.indent_spaces);
+  
+      function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
+  
+      /* Get the value from a foo(<param_name> = <param_value>) style call */
+      symbol_c *param_value = function_call_param_iterator.search(param_name);
+  
+      /* Get the value from a foo(<param_value>) style call */
+      if (param_value == NULL)
+        param_value = function_call_param_iterator.next();
+  
+      symbol_c *param_type = fp_iterator.param_type();
+      if (param_type == NULL) ERROR;
+  
+      switch (param_direction) {
+        case function_param_iterator_c::direction_in:
+          if (param_value == NULL) {
+            /* No value given for parameter, so we must use the default... */
+            /* First check whether default value specified in function declaration...*/
+            param_value = fp_iterator.default_value();
+          }
+          if (param_value == NULL) {
+            /* If not, get the default value of this variable's type */
+            param_value = (symbol_c *)param_type->accept(*type_initial_value_c::instance());
+          }
+          if (param_value == NULL) ERROR;
+          param_value->accept(*this);
+          break;
+        case function_param_iterator_c::direction_out:
+        case function_param_iterator_c::direction_inout:
+          if (param_value == NULL) {
+            /* no parameter value given, so we pass a previously declared temporary variable. */
+            std::string *temp_var_name = temp_var_name_factory.new_name();
+            s4o.print(*temp_var_name);
+            delete temp_var_name;
+          } else {
+            param_value->accept(*this);
+          }
+          break;
+        case function_param_iterator_c::direction_extref:
+          /* TODO! */
+          ERROR;
+          break;
+      } /* switch */
+    } /* for(...) */
+    // symbol->parameter_assignment->accept(*this);
+    s4o.print(")");
+    s4o.indent_left();
+  }
+
+  return NULL;
+}
+
+/********************/
+/* B 3.2 Statements */
+/********************/
+void *visit(statement_list_c *symbol) {
+  return print_list(symbol, s4o.indent_spaces, ";\n" + s4o.indent_spaces, ";\n");
+}
+
+/*********************************/
+/* B 3.2.1 Assignment Statements */
+/*********************************/
+void *visit(assignment_statement_c *symbol) {
+  symbol->l_exp->accept(*this);
+  s4o.print(" = ");
+  symbol->r_exp->accept(*this);
+  return NULL;
+}
+
+/*****************************************/
+/* B 3.2.2 Subprogram Control Statements */
+/*****************************************/
+
+/* fb_name '(' [param_assignment_list] ')' */
+/* param_assignment_list -> may be NULL ! */
+//SYM_REF2(fb_invocation_c, fb_name, param_assignment_list)
+void *visit(fb_invocation_c *symbol) {
+  TRACE("fb_invocation_c");
+  /* first figure out what is the name of the function block type of the function block being called... */
+  symbol_c *function_block_type_name = this->search_fb_instance_decl->get_type_name(symbol->fb_name);
+    /* should never occur. The function block instance MUST have been declared... */
+  if (function_block_type_name == NULL) ERROR;
+
+  /* Now find the declaration of the function block type being called... */
+  function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(function_block_type_name);
+    /* should never occur. The function block type being called MUST be in the symtable... */
+  if (fb_decl == function_block_type_symtable.end_value()) ERROR;
+
+  /* loop through each function block parameter, find the value we should pass
+   * to it, and then output the c equivalent...
+   */
+  function_param_iterator_c fp_iterator(fb_decl);
+  identifier_c *param_name;
+  function_call_param_iterator_c function_call_param_iterator(symbol);
+  for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
+    function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
+
+    /* Get the value from a foo(<param_name> = <param_value>) style call */
+    symbol_c *param_value = function_call_param_iterator.search(param_name);
+
+    /* Get the value from a foo(<param_value>) style call */
+    if (param_value == NULL)
+      param_value = function_call_param_iterator.next();
+
+    /* now output the value assignment */
+    if (param_value != NULL)
+      if ((param_direction == function_param_iterator_c::direction_in) ||
+          (param_direction == function_param_iterator_c::direction_inout)) {
+        print_variable_prefix();
+        symbol->fb_name->accept(*this);
+        s4o.print(".");
+        param_name->accept(*this);
+        s4o.print(" = ");
+        param_value->accept(*this);
+        s4o.print(";\n" + s4o.indent_spaces);
+      }
+  } /* for(...) */
+
+  /* now call the function... */
+  function_block_type_name->accept(*this);
+  s4o.print(FB_FUNCTION_SUFFIX);
+  s4o.print("(&");
+  print_variable_prefix();
+  symbol->fb_name->accept(*this);
+  s4o.print(")");
+
+  /* loop through each function parameter, find the variable to which
+   * we should atribute the value of all output or inoutput parameters.
+   */
+  fp_iterator.reset();
+  function_call_param_iterator.reset();
+  for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {
+    function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
+
+    /* Get the value from a foo(<param_name> = <param_value>) style call */
+    symbol_c *param_value = function_call_param_iterator.search(param_name);
+
+    /* Get the value from a foo(<param_value>) style call */
+    if (param_value == NULL)
+      param_value = function_call_param_iterator.next();
+
+    /* now output the value assignment */
+    if (param_value != NULL)
+      if ((param_direction == function_param_iterator_c::direction_out) ||
+          (param_direction == function_param_iterator_c::direction_inout)) {
+        s4o.print(";\n"+ s4o.indent_spaces);
+        param_value->accept(*this);
+        s4o.print(" = ");
+        print_variable_prefix();
+        symbol->fb_name->accept(*this);
+        s4o.print(".");
+        param_name->accept(*this);
+      }
+  } /* for(...) */
+
+  return NULL;
+}
+
+
+
+
+/* helper symbol for fb_invocation */
+/* param_assignment_list ',' param_assignment */
+void *visit(param_assignment_list_c *symbol) {
+  TRACE("param_assignment_list_c");
+  /* this should never be called... */
+  ERROR;
+  return NULL;
+//  return print_list(symbol, "", ", ");
+}
+
+
+void *visit(input_variable_param_assignment_c *symbol) {
+  TRACE("input_variable_param_assignment_c");
+  /* this should never be called... */
+  ERROR;
+  return NULL;
+/*
+  symbol->variable_name->accept(*this);
+  s4o.print(" = ");
+  symbol->expression->accept(*this);
+  return NULL;
+*/
+}
+
+void *visit(output_variable_param_assignment_c *symbol) {
+  TRACE("output_variable_param_assignment_c");
+  /* this should never be called... */
+  ERROR;
+  return NULL;
+/*
+  s4o.print(s4o.indent_spaces);
+  if (symbol->not_param != NULL)
+    symbol->not_param->accept(*this);
+  symbol->variable_name->accept(*this);
+  s4o.print(" => ");
+  symbol->variable->accept(*this);
+  return NULL;
+*/
+}
+
+// TODO: the NOT symbol in function (block) calls...
+void *visit(not_paramassign_c *symbol) {
+  TRACE("not_paramassign_c");
+  /* this should never be called... */
+  ERROR;
+  return NULL;
+/*
+  s4o.print("NOT ");
+  return NULL;
+*/
+}
+
+
+/********************************/
+/* B 3.2.3 Selection Statements */
+/********************************/
+void *visit(if_statement_c *symbol) {
+  s4o.print("if (");
+  symbol->expression->accept(*this);
+  s4o.print(") {\n");
+  s4o.indent_right();
+  symbol->statement_list->accept(*this);
+  s4o.indent_left();
+  symbol->elseif_statement_list->accept(*this);
+
+  if (symbol->else_statement_list != NULL) {
+    s4o.print(s4o.indent_spaces); s4o.print("} else {\n");
+    s4o.indent_right();
+    symbol->else_statement_list->accept(*this);
+    s4o.indent_left();
+  }
+  s4o.print(s4o.indent_spaces); s4o.print("}");
+  return NULL;
+}
+
+/* helper symbol for if_statement */
+void *visit(elseif_statement_list_c *symbol) {return print_list(symbol);}
+
+/* helper symbol for elseif_statement_list */
+void *visit(elseif_statement_c *symbol) {
+  s4o.print(s4o.indent_spaces); s4o.print("} else if (");
+  symbol->expression->accept(*this);
+  s4o.print(") {\n");
+  s4o.indent_right();
+  symbol->statement_list->accept(*this);
+  s4o.indent_left();
+  return NULL;
+}
+
+void *visit(case_statement_c *symbol) {
+  s4o.print("switch(");
+  symbol->expression->accept(*this);
+  s4o.print(") {\n");
+  s4o.indent_right();
+  symbol->case_element_list->accept(*this);
+  if (symbol->statement_list != NULL) {
+    s4o.print(s4o.indent_spaces + "default:\n");
+    s4o.indent_right();
+    symbol->statement_list->accept(*this);
+    s4o.print(s4o.indent_spaces + "break;\n");
+    s4o.indent_left();
+  }
+  s4o.indent_left();
+  s4o.print(s4o.indent_spaces + "}");
+  return NULL;
+}
+
+/* helper symbol for case_statement */
+void *visit(case_element_list_c *symbol) {return print_list(symbol);}
+
+void *visit(case_element_c *symbol) {
+  s4o.print(s4o.indent_spaces + "case ");
+  symbol->case_list->accept(*this);
+  s4o.print(" :\n");
+  s4o.indent_right();
+  symbol->statement_list->accept(*this);
+  s4o.print(s4o.indent_spaces + "break;\n");
+  s4o.indent_left();
+  return NULL;
+}
+
+void *visit(case_list_c *symbol) {return print_list(symbol, "", ", ");}
+
+/********************************/
+/* B 3.2.4 Iteration Statements */
+/********************************/
+void *visit(for_statement_c *symbol) {
+  s4o.print("for(");
+  symbol->control_variable->accept(*this);
+  s4o.print(" = ");
+  symbol->beg_expression->accept(*this);
+  s4o.print("; ");
+  symbol->control_variable->accept(*this);
+  s4o.print(" != ");
+  symbol->end_expression->accept(*this);
+  s4o.print("; ");
+  symbol->control_variable->accept(*this);
+  if (symbol->by_expression != NULL) {
+    s4o.print(" += ");
+    symbol->by_expression->accept(*this);
+  } else {
+    s4o.print("++");
+  }
+  s4o.print(") {\n");
+  s4o.indent_right();
+  symbol->statement_list->accept(*this);
+  s4o.indent_left();
+  s4o.print(s4o.indent_spaces); s4o.print("}");
+  return NULL;
+}
+void *visit(while_statement_c *symbol) {
+  s4o.print("while (");
+  symbol->expression->accept(*this);
+  s4o.print(") {\n");
+  s4o.indent_right();
+  symbol->statement_list->accept(*this);
+  s4o.indent_left();
+  s4o.print(s4o.indent_spaces); s4o.print("}");
+  return NULL;
+}
+void *visit(repeat_statement_c *symbol) {
+  s4o.print("do {\n");
+  s4o.indent_right();
+  symbol->statement_list->accept(*this);
+  s4o.indent_left();
+  s4o.print(s4o.indent_spaces); s4o.print("} while(");
+  symbol->expression->accept(*this);
+  s4o.print(")");
+  return NULL;
+}
+void *visit(exit_statement_c *symbol) {
+  s4o.print("exit(0)");
+  return NULL;
+}
+
+
+
+}; /* generate_c_st_c */
+
+
+
+
+
+
+
+
+