lbessard@70: /*
lbessard@70:  * (c) 2003 Mario de Sousa
lbessard@70:  *
lbessard@70:  * Offered to the public under the terms of the GNU General Public License
lbessard@70:  * as published by the Free Software Foundation; either version 2 of the
lbessard@70:  * License, or (at your option) any later version.
lbessard@70:  *
lbessard@70:  * This program is distributed in the hope that it will be useful, but
lbessard@70:  * WITHOUT ANY WARRANTY; without even the implied warranty of
lbessard@70:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
lbessard@70:  * Public License for more details.
lbessard@70:  *
lbessard@70:  * This code is made available on the understanding that it will not be
lbessard@70:  * used in safety-critical situations without a full and competent review.
lbessard@70:  */
lbessard@70: 
lbessard@70: /*
lbessard@70:  * An IEC 61131-3 IL and ST compiler.
lbessard@70:  *
lbessard@70:  * Based on the
lbessard@70:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
lbessard@70:  *
lbessard@70:  */
lbessard@70: 
lbessard@70: 
lbessard@70: /*
lbessard@70:  * Function call parameter iterator.
lbessard@70:  *
lbessard@70:  * This is part of the 4th stage that generates
lbessard@70:  * a c++ source program equivalent to the IL and ST
lbessard@70:  * code.
lbessard@70:  */
lbessard@70: 
lbessard@70: 
lbessard@70: //#include <stdio.h>  /* required for NULL */
lbessard@70: //#include <string>
lbessard@70: //#include <iostream>
lbessard@70: 
lbessard@70: //#include "../../util/symtable.hh"
lbessard@70: 
lbessard@70: //#include "generate_c.hh"
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: /* given a function_body_c, iterate through each
lbessard@70:  * function in/out/inout parameter, returning the name
lbessard@70:  * of each parameter...
lbessard@70:  */
lbessard@70: class function_call_iterator_c : public iterator_visitor_c {
lbessard@70:   private:
lbessard@70:     symbol_c *start_symbol;
lbessard@70:     int next_fcall, fcall_count;
lbessard@70:     //identifier_c *current_fcall_name;
lbessard@70:     symbol_c *current_fcall_name;
lbessard@70:     //function_invocation_c *current_finvocation;
lbessard@70:     symbol_c *current_finvocation;
lbessard@70: 
lbessard@70:   public:
lbessard@70:     /* initialise the iterator object.
lbessard@70:      * We must be given a reference to the function declaration
lbessard@70:      * that will be analysed...
lbessard@70:      */
lbessard@70:     function_call_iterator_c(symbol_c *symbol) {
lbessard@70:       this->start_symbol = symbol;
lbessard@70:       next_fcall = fcall_count = 0;
lbessard@70:       current_finvocation = NULL;
lbessard@70:       current_fcall_name = NULL;
lbessard@70:     }
lbessard@70: 
lbessard@70:     /* Skip to the next function call. After object creation,
lbessard@70:      * the object references _before_ the first, so
lbessard@70:      * this function must be called once to get the object to
lbessard@70:      * reference the first function call...
lbessard@70:      *
lbessard@70:      * Returns the function_invocation_c!
lbessard@70:      */
lbessard@70:     //function_invocation_c *next(void) {TRACE("function_call_iterator_c::next(): called ");
lbessard@70:     symbol_c *next(void) {TRACE("function_call_iterator_c::next(): called ");
lbessard@70:       fcall_count = 0;
lbessard@70:       next_fcall++;
lbessard@70:       current_finvocation = NULL;
lbessard@70:       current_fcall_name = NULL;
lbessard@70: 
lbessard@70:       start_symbol->accept(*this);
lbessard@70:       return current_finvocation;
lbessard@70:     }
lbessard@70: 
lbessard@70:     /* Returns the name of the currently referenced function invocation */
lbessard@70:     identifier_c *fname(void) {
lbessard@70:       identifier_c *identifier = dynamic_cast<identifier_c *>(current_fcall_name);
lbessard@70:       if (identifier == NULL) ERROR;
lbessard@70:       return identifier;
lbessard@70:     }
lbessard@70: 
lbessard@70: 
lbessard@70: /***************************************/
lbessard@70: /* B.3 - Language ST (Structured Text) */
lbessard@70: /***************************************/
lbessard@70: /***********************/
lbessard@70: /* B 3.1 - Expressions */
lbessard@70: /***********************/
lbessard@70:   void *visit(function_invocation_c *symbol) {
lbessard@70:     fcall_count++;
lbessard@70:     if (next_fcall == fcall_count) {
lbessard@70:       current_finvocation = symbol;
lbessard@70:       current_fcall_name = symbol->function_name;
lbessard@70:     }
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: /****************************************/
lbessard@70: /* B.2 - Language IL (Instruction List) */
lbessard@70: /****************************************/
lbessard@70: /***********************************/
lbessard@70: /* B 2.1 Instructions and Operands */
lbessard@70: /***********************************/
lbessard@70: 
lbessard@70: /* | function_name [il_operand_list] */
lbessard@70: // SYM_REF2(il_function_call_c, function_name, il_operand_list)
lbessard@70:   void *visit(il_function_call_c *symbol) {
lbessard@70:     fcall_count++;
lbessard@70:     if (next_fcall == fcall_count) {
lbessard@70:       current_finvocation = symbol;
lbessard@70:       current_fcall_name = symbol->function_name;
lbessard@70:     }
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: /* | function_name '(' eol_list [il_param_list] ')' */
lbessard@70: // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
lbessard@70:   void *visit(il_formal_funct_call_c *symbol) {
lbessard@70:     fcall_count++;
lbessard@70:     if (next_fcall == fcall_count) {
lbessard@70:       current_finvocation = symbol;
lbessard@70:       current_fcall_name = symbol->function_name;
lbessard@70:     }
lbessard@70:     return NULL;
lbessard@70:   }
lbessard@70: 
lbessard@70: 
lbessard@70: };
lbessard@70: 
lbessard@70: 
lbessard@70: 
lbessard@70: