--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage4/generate_c/function_call_iterator.cc	Wed Oct 24 17:39:51 2007 +0200
@@ -0,0 +1,150 @@
+/*
+ * (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)
+ *
+ */
+
+
+/*
+ * Function call parameter iterator.
+ *
+ * This is part of the 4th stage that generates
+ * a c++ source program equivalent to the IL and ST
+ * code.
+ */
+
+
+//#include <stdio.h>  /* required for NULL */
+//#include <string>
+//#include <iostream>
+
+//#include "../../util/symtable.hh"
+
+//#include "generate_c.hh"
+
+
+
+
+/* given a function_body_c, iterate through each
+ * function in/out/inout parameter, returning the name
+ * of each parameter...
+ */
+class function_call_iterator_c : public iterator_visitor_c {
+  private:
+    symbol_c *start_symbol;
+    int next_fcall, fcall_count;
+    //identifier_c *current_fcall_name;
+    symbol_c *current_fcall_name;
+    //function_invocation_c *current_finvocation;
+    symbol_c *current_finvocation;
+
+  public:
+    /* initialise the iterator object.
+     * We must be given a reference to the function declaration
+     * that will be analysed...
+     */
+    function_call_iterator_c(symbol_c *symbol) {
+      this->start_symbol = symbol;
+      next_fcall = fcall_count = 0;
+      current_finvocation = NULL;
+      current_fcall_name = NULL;
+    }
+
+    /* Skip to the next function call. After object creation,
+     * the object references _before_ the first, so
+     * this function must be called once to get the object to
+     * reference the first function call...
+     *
+     * Returns the function_invocation_c!
+     */
+    //function_invocation_c *next(void) {TRACE("function_call_iterator_c::next(): called ");
+    symbol_c *next(void) {TRACE("function_call_iterator_c::next(): called ");
+      fcall_count = 0;
+      next_fcall++;
+      current_finvocation = NULL;
+      current_fcall_name = NULL;
+
+      start_symbol->accept(*this);
+      return current_finvocation;
+    }
+
+    /* Returns the name of the currently referenced function invocation */
+    identifier_c *fname(void) {
+      identifier_c *identifier = dynamic_cast<identifier_c *>(current_fcall_name);
+      if (identifier == NULL) ERROR;
+      return identifier;
+    }
+
+
+/***************************************/
+/* B.3 - Language ST (Structured Text) */
+/***************************************/
+/***********************/
+/* B 3.1 - Expressions */
+/***********************/
+  void *visit(function_invocation_c *symbol) {
+    fcall_count++;
+    if (next_fcall == fcall_count) {
+      current_finvocation = symbol;
+      current_fcall_name = symbol->function_name;
+    }
+    return NULL;
+  }
+
+
+
+/****************************************/
+/* B.2 - Language IL (Instruction List) */
+/****************************************/
+/***********************************/
+/* B 2.1 Instructions and Operands */
+/***********************************/
+
+/* | function_name [il_operand_list] */
+// SYM_REF2(il_function_call_c, function_name, il_operand_list)
+  void *visit(il_function_call_c *symbol) {
+    fcall_count++;
+    if (next_fcall == fcall_count) {
+      current_finvocation = symbol;
+      current_fcall_name = symbol->function_name;
+    }
+    return NULL;
+  }
+
+
+
+/* | function_name '(' eol_list [il_param_list] ')' */
+// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
+  void *visit(il_formal_funct_call_c *symbol) {
+    fcall_count++;
+    if (next_fcall == fcall_count) {
+      current_finvocation = symbol;
+      current_fcall_name = symbol->function_name;
+    }
+    return NULL;
+  }
+
+
+};
+
+
+
+