etisserant@0: /*
etisserant@0:  * (c) 2003 Mario de Sousa
etisserant@0:  *
etisserant@0:  * Offered to the public under the terms of the GNU General Public License
etisserant@0:  * as published by the Free Software Foundation; either version 2 of the
etisserant@0:  * License, or (at your option) any later version.
etisserant@0:  *
etisserant@0:  * This program is distributed in the hope that it will be useful, but
etisserant@0:  * WITHOUT ANY WARRANTY; without even the implied warranty of
etisserant@0:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
etisserant@0:  * Public License for more details.
etisserant@0:  *
etisserant@0:  * This code is made available on the understanding that it will not be
etisserant@0:  * used in safety-critical situations without a full and competent review.
etisserant@0:  */
etisserant@0: 
etisserant@0: /*
etisserant@0:  * An IEC 61131-3 IL and ST compiler.
etisserant@0:  *
etisserant@0:  * Based on the
etisserant@0:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
etisserant@0:  *
etisserant@0:  */
etisserant@0: 
etisserant@0: 
etisserant@0: /*
etisserant@0:  * Function call parameter iterator.
etisserant@0:  *
etisserant@0:  * This is part of the 4th stage that generates
etisserant@0:  * a c++ source program equivalent to the IL and ST
etisserant@0:  * code.
etisserant@0:  */
etisserant@0: 
etisserant@0: 
etisserant@0: //#include <stdio.h>  /* required for NULL */
etisserant@0: //#include <string>
etisserant@0: //#include <iostream>
etisserant@0: 
etisserant@0: //#include "../../util/symtable.hh"
etisserant@0: 
etisserant@0: //#include "generate_cc.hh"
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: /* given a function_body_c, iterate through each
etisserant@0:  * function in/out/inout parameter, returning the name
etisserant@0:  * of each parameter...
etisserant@0:  */
etisserant@0: class function_call_iterator_c : public iterator_visitor_c {
etisserant@0:   private:
etisserant@0:     symbol_c *start_symbol;
etisserant@0:     int next_fcall, fcall_count;
etisserant@0:     //identifier_c *current_fcall_name;
etisserant@0:     symbol_c *current_fcall_name;
etisserant@0:     //function_invocation_c *current_finvocation;
etisserant@0:     symbol_c *current_finvocation;
etisserant@0: 
etisserant@0:   public:
etisserant@0:     /* initialise the iterator object.
etisserant@0:      * We must be given a reference to the function declaration
etisserant@0:      * that will be analysed...
etisserant@0:      */
etisserant@0:     function_call_iterator_c(symbol_c *symbol) {
etisserant@0:       this->start_symbol = symbol;
etisserant@0:       next_fcall = fcall_count = 0;
etisserant@0:       current_finvocation = NULL;
etisserant@0:       current_fcall_name = NULL;
etisserant@0:     }
etisserant@0: 
etisserant@0:     /* Skip to the next function call. After object creation,
etisserant@0:      * the object references _before_ the first, so
etisserant@0:      * this function must be called once to get the object to
etisserant@0:      * reference the first function call...
etisserant@0:      *
etisserant@0:      * Returns the function_invocation_c!
etisserant@0:      */
etisserant@0:     //function_invocation_c *next(void) {TRACE("function_call_iterator_c::next(): called ");
etisserant@0:     symbol_c *next(void) {TRACE("function_call_iterator_c::next(): called ");
etisserant@0:       fcall_count = 0;
etisserant@0:       next_fcall++;
etisserant@0:       current_finvocation = NULL;
etisserant@0:       current_fcall_name = NULL;
etisserant@0: 
etisserant@0:       start_symbol->accept(*this);
etisserant@0:       return current_finvocation;
etisserant@0:     }
etisserant@0: 
etisserant@0:     /* Returns the name of the currently referenced function invocation */
etisserant@0:     identifier_c *fname(void) {
etisserant@0:       identifier_c *identifier = dynamic_cast<identifier_c *>(current_fcall_name);
etisserant@0:       if (identifier == NULL) ERROR;
etisserant@0:       return identifier;
etisserant@0:     }
etisserant@0: 
etisserant@0: 
etisserant@0: /***************************************/
etisserant@0: /* B.3 - Language ST (Structured Text) */
etisserant@0: /***************************************/
etisserant@0: /***********************/
etisserant@0: /* B 3.1 - Expressions */
etisserant@0: /***********************/
etisserant@0:   void *visit(function_invocation_c *symbol) {
etisserant@0:     fcall_count++;
etisserant@0:     if (next_fcall == fcall_count) {
etisserant@0:       current_finvocation = symbol;
etisserant@0:       current_fcall_name = symbol->function_name;
etisserant@0:     }
etisserant@0:     return NULL;
etisserant@0:   }
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: /****************************************/
etisserant@0: /* B.2 - Language IL (Instruction List) */
etisserant@0: /****************************************/
etisserant@0: /***********************************/
etisserant@0: /* B 2.1 Instructions and Operands */
etisserant@0: /***********************************/
etisserant@0: 
etisserant@0: /* | function_name [il_operand_list] */
etisserant@0: // SYM_REF2(il_function_call_c, function_name, il_operand_list)
etisserant@0:   void *visit(il_function_call_c *symbol) {
etisserant@0:     fcall_count++;
etisserant@0:     if (next_fcall == fcall_count) {
etisserant@0:       current_finvocation = symbol;
etisserant@0:       current_fcall_name = symbol->function_name;
etisserant@0:     }
etisserant@0:     return NULL;
etisserant@0:   }
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: /* | function_name '(' eol_list [il_param_list] ')' */
etisserant@0: // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
etisserant@0:   void *visit(il_formal_funct_call_c *symbol) {
etisserant@0:     fcall_count++;
etisserant@0:     if (next_fcall == fcall_count) {
etisserant@0:       current_finvocation = symbol;
etisserant@0:       current_fcall_name = symbol->function_name;
etisserant@0:     }
etisserant@0:     return NULL;
etisserant@0:   }
etisserant@0: 
etisserant@0: 
etisserant@0: };
etisserant@0: 
etisserant@0: 
etisserant@0: 
etisserant@0: