mario@181: /*
msousa@265:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
mario@181:  *
msousa@265:  *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
mario@181:  *
msousa@265:  *  This program is free software: you can redistribute it and/or modify
msousa@265:  *  it under the terms of the GNU General Public License as published by
msousa@265:  *  the Free Software Foundation, either version 3 of the License, or
msousa@265:  *  (at your option) any later version.
msousa@265:  *
msousa@265:  *  This program is distributed in the hope that it will be useful,
msousa@265:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@265:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
msousa@265:  *  GNU General Public License for more details.
msousa@265:  *
msousa@265:  *  You should have received a copy of the GNU General Public License
msousa@265:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
msousa@265:  *
mario@181:  *
mario@181:  * This code is made available on the understanding that it will not be
mario@181:  * used in safety-critical situations without a full and competent review.
mario@181:  */
mario@181: 
mario@181: /*
msousa@265:  * An IEC 61131-3 compiler.
mario@181:  *
mario@181:  * Based on the
mario@181:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
mario@181:  *
mario@181:  */
mario@181: 
mario@181: 
mario@181: /*
mario@181:  * Function call parameter iterator.
mario@181:  *
mario@181:  * This is part of the 4th stage that generates
mario@181:  * a c++ source program equivalent to the IL and ST
mario@181:  * code.
mario@181:  */
mario@181: 
mario@181: /* given a function_body_c, iterate through each
ccb@202:  * function/FB call in that code.
mario@181:  */
mario@181: 
mario@181: 
mario@181: #include "function_call_iterator.hh"
mario@181: 
mario@181: 
mario@181: //#define DEBUG
mario@181: #ifdef DEBUG
mario@181: #define TRACE(classname) printf("\n____%s____\n",classname);
mario@181: #else
mario@181: #define TRACE(classname)
mario@181: #endif
mario@181: 
mario@181: #define ERROR error_exit(__FILE__,__LINE__)
mario@181: /* function defined in main.cc */
mario@181: extern void error_exit(const char *file_name, int line_no);
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: /* initialise the iterator object.
mario@181:  * We must be given a reference to the function declaration
mario@181:  * that will be analysed...
mario@181:  */
mario@181: function_call_iterator_c::function_call_iterator_c(symbol_c *symbol) {
mario@181:   this->start_symbol = symbol;
mario@181:   next_fcall = fcall_count = 0;
mario@181:   current_finvocation = NULL;
mario@181:   current_fcall_name = NULL;
mario@181: }
mario@181: 
mario@181: /* Skip to the next function call. After object creation,
mario@181:  * the object references _before_ the first, so
mario@181:  * this function must be called once to get the object to
mario@181:  * reference the first function call...
mario@181:  *
mario@181:  * Returns the function_invocation_c!
mario@181:  */
mario@181: //function_invocation_c *next(void) {TRACE("function_call_iterator_c::next(): called ");
mario@181: symbol_c *function_call_iterator_c::next(void) {TRACE("function_call_iterator_c::next(): called ");
mario@181:   fcall_count = 0;
mario@181:   next_fcall++;
mario@181:   current_finvocation = NULL;
mario@181:   current_fcall_name = NULL;
mario@181: 
mario@181:   start_symbol->accept(*this);
mario@181:   return current_finvocation;
mario@181: }
mario@181: 
mario@181: /* Returns the name of the currently referenced function invocation */
mario@181: identifier_c *function_call_iterator_c::fname(void) {
mario@181:   identifier_c *identifier = dynamic_cast<identifier_c *>(current_fcall_name);
mario@181:   if (identifier == NULL) ERROR;
mario@181:   return identifier;
mario@181: }
mario@181: 
mario@181: 
mario@181: /***************************************/
mario@181: /* B.3 - Language ST (Structured Text) */
mario@181: /***************************************/
mario@181: /***********************/
mario@181: /* B 3.1 - Expressions */
mario@181: /***********************/
mario@181:   void *function_call_iterator_c::visit(function_invocation_c *symbol) {
mario@181:     fcall_count++;
mario@181:     if (next_fcall == fcall_count) {
mario@181:       current_finvocation = symbol;
mario@181:       current_fcall_name = symbol->function_name;
mario@181:     }
mario@181:     return NULL;
mario@181:   }
mario@181: 
mario@181: 
mario@181: 
mario@181: /****************************************/
mario@181: /* B.2 - Language IL (Instruction List) */
mario@181: /****************************************/
mario@181: /***********************************/
mario@181: /* B 2.1 Instructions and Operands */
mario@181: /***********************************/
mario@181: 
mario@181: /* | function_name [il_operand_list] */
mario@181: // SYM_REF2(il_function_call_c, function_name, il_operand_list)
mario@181:   void *function_call_iterator_c::visit(il_function_call_c *symbol) {
mario@181:     fcall_count++;
mario@181:     if (next_fcall == fcall_count) {
mario@181:       current_finvocation = symbol;
mario@181:       current_fcall_name = symbol->function_name;
mario@181:     }
mario@181:     return NULL;
mario@181:   }
mario@181: 
mario@181: 
mario@181: 
mario@181: /* | function_name '(' eol_list [il_param_list] ')' */
mario@181: // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
mario@181:   void *function_call_iterator_c::visit(il_formal_funct_call_c *symbol) {
mario@181:     fcall_count++;
mario@181:     if (next_fcall == fcall_count) {
mario@181:       current_finvocation = symbol;
mario@181:       current_fcall_name = symbol->function_name;
mario@181:     }
mario@181:     return NULL;
mario@181:   }
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: