absyntax/visitor.cc
author Mario de Sousa <msousa@fe.up.pt>
Fri, 10 Jun 2011 10:13:15 +0100
changeset 323 d3f2ef59b310
parent 279 c0453b7f99df
child 350 2c3c4dc34979
permissions -rwxr-xr-x
Clean up some code.
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * An IEC 61131-3 compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 */
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/*
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 * VISITOR.CC
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 *
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 * Three base implementations of the visitor interface,
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 * that may be later extended to execute a particular algorithm.
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 *
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 * The null (class null_visitor_c) does nothing.
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 *
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 * The iterator (class iterator_visitor_c) iterates through
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 * every object in the syntax tree.
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 *
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 * The search class (class search_visitor_c) iterates through
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 * every object, until one returns a value != NULL.
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 */
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#include <unistd.h>
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#include <stdio.h>  /* required for NULL */
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#include "visitor.hh"
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#include <iostream>
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/******************/
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/* visitor_c      */
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/******************/
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visitor_c::~visitor_c(void) {return;}
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/******************/
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/* null_visitor_c */
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/******************/
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null_visitor_c::~null_visitor_c(void) {return;}
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#define SYM_LIST(class_name_c)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_TOKEN(class_name_c)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF0(class_name_c)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF1(class_name_c, ref1)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF2(class_name_c, ref1, ref2)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF3(class_name_c, ref1, ref2, ref3)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF4(class_name_c, ref1, ref2, ref3, ref4)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF5(class_name_c, ref1, ref2, ref3, ref4, ref5)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF6(class_name_c, ref1, ref2, ref3, ref4, ref5, ref6)	\
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  void *null_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#include "absyntax.def"
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#undef SYM_LIST
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#undef SYM_TOKEN
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#undef SYM_REF0
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#undef SYM_REF1
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#undef SYM_REF2
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#undef SYM_REF3
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#undef SYM_REF4
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#undef SYM_REF5
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#undef SYM_REF6
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/**********************/
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/* iterator_visitor_c */
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/**********************/
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iterator_visitor_c::~iterator_visitor_c(void) {return;}
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void *iterator_visitor_c::visit_list(list_c *list) {
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  for(int i = 0; i < list->n; i++) {
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    list->elements[i]->accept(*this);
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  }
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  return NULL;
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}
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#define SYM_LIST(class_name_c)	\
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  void *iterator_visitor_c::visit(class_name_c *symbol) {return visit_list(symbol);}
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#define SYM_TOKEN(class_name_c)	\
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  void *iterator_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF0(class_name_c)	\
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  void *iterator_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF1(class_name_c, ref1)			\
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void *iterator_visitor_c::visit(class_name_c *symbol) {	\
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  if (symbol->ref1!=NULL) symbol->ref1->accept(*this);	\
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  return NULL;						\
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}
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0
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#define SYM_REF2(class_name_c, ref1, ref2)		\
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void *iterator_visitor_c::visit(class_name_c *symbol) {	\
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  if (symbol->ref1!=NULL) symbol->ref1->accept(*this);	\
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  if (symbol->ref2!=NULL) symbol->ref2->accept(*this);	\
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  return NULL;						\
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}
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#define SYM_REF3(class_name_c, ref1, ref2, ref3)	\
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void *iterator_visitor_c::visit(class_name_c *symbol) {	\
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  if (symbol->ref1) symbol->ref1->accept(*this);	\
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  if (symbol->ref2) symbol->ref2->accept(*this);	\
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  if (symbol->ref3) symbol->ref3->accept(*this);	\
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  return NULL;						\
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}
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0
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#define SYM_REF4(class_name_c, ref1, ref2, ref3, ref4)	\
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void *iterator_visitor_c::visit(class_name_c *symbol) {	\
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  if (symbol->ref1) symbol->ref1->accept(*this);	\
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  if (symbol->ref2) symbol->ref2->accept(*this);	\
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  if (symbol->ref3) symbol->ref3->accept(*this);	\
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  if (symbol->ref4) symbol->ref4->accept(*this);	\
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  return NULL;						\
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}
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#define SYM_REF5(class_name_c, ref1, ref2, ref3, ref4, ref5)		\
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void *iterator_visitor_c::visit(class_name_c *symbol) {			\
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  if (symbol->ref1) symbol->ref1->accept(*this);			\
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  if (symbol->ref2) symbol->ref2->accept(*this);			\
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  if (symbol->ref3) symbol->ref3->accept(*this);			\
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  if (symbol->ref4) symbol->ref4->accept(*this);			\
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  if (symbol->ref5) symbol->ref5->accept(*this);			\
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  return NULL;								\
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}
0
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#define SYM_REF6(class_name_c, ref1, ref2, ref3, ref4, ref5, ref6)	\
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void *iterator_visitor_c::visit(class_name_c *symbol) {			\
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  if (symbol->ref1) symbol->ref1->accept(*this);			\
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  if (symbol->ref2) symbol->ref2->accept(*this);			\
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  if (symbol->ref3) symbol->ref3->accept(*this);			\
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  if (symbol->ref4) symbol->ref4->accept(*this);			\
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  if (symbol->ref5) symbol->ref5->accept(*this);			\
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  if (symbol->ref6) symbol->ref6->accept(*this);			\
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  return NULL;								\
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}
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#include "absyntax.def"
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#undef SYM_LIST
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#undef SYM_TOKEN
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#undef SYM_REF0
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#undef SYM_REF1
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#undef SYM_REF2
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#undef SYM_REF3
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#undef SYM_REF4
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#undef SYM_REF5
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#undef SYM_REF6
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/********************/
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/* search_visitor_c */
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/********************/
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search_visitor_c::~search_visitor_c(void) {return;}
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void *search_visitor_c::visit_list(list_c *list) {
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  for(int i = 0; i < list->n; i++) {
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    void *res = list->elements[i]->accept(*this);
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    if (res != NULL)
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      return res;
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  }
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  return NULL;
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}
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#define SYM_LIST(class_name_c)	\
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  void *search_visitor_c::visit(class_name_c *symbol) {return visit_list(symbol);}
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#define SYM_TOKEN(class_name_c)	\
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  void *search_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF0(class_name_c)	\
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  void *search_visitor_c::visit(class_name_c *symbol) {return NULL;}
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#define SYM_REF1(class_name_c, ref1)				\
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void *search_visitor_c::visit(class_name_c *symbol) {		\
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  if (symbol->ref1) return symbol->ref1->accept(*this);		\
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  return NULL;							\
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}
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0
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#define SYM_REF2(class_name_c, ref1, ref2)			\
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void *search_visitor_c::visit(class_name_c *symbol) {		\
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  void *res = NULL;						\
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  if (symbol->ref1) res =  symbol->ref1->accept(*this);		\
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  if (res != NULL)  return res;					\
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  if (symbol->ref2) return symbol->ref2->accept(*this);		\
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  return NULL;							\
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}
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#define SYM_REF3(class_name_c, ref1, ref2, ref3)		\
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void *search_visitor_c::visit(class_name_c *symbol) {		\
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  void *res = NULL;						\
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  if (symbol->ref1) res =  symbol->ref1->accept(*this);		\
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  if (res != NULL)  return res;					\
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  if (symbol->ref2) res =  symbol->ref2->accept(*this);		\
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  if (res != NULL)  return res;					\
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  if (symbol->ref3) return symbol->ref3->accept(*this);		\
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  return NULL;							\
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}
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0
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#define SYM_REF4(class_name_c, ref1, ref2, ref3, ref4)		\
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void *search_visitor_c::visit(class_name_c *symbol) {		\
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  void *res = NULL;						\
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  if (symbol->ref1) res =  symbol->ref1->accept(*this);		\
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  if (res != NULL)  return res;					\
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  if (symbol->ref2) res =  symbol->ref2->accept(*this);		\
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  if (res != NULL)  return res;					\
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  if (symbol->ref3) res =  symbol->ref3->accept(*this);		\
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  if (res != NULL)  return res;					\
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  if (symbol->ref4) return symbol->ref4->accept(*this);		\
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  return NULL;							\
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}
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#define SYM_REF5(class_name_c, ref1, ref2, ref3, ref4, ref5)		\
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void *search_visitor_c::visit(class_name_c *symbol) {			\
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  void *res = NULL;							\
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  if (symbol->ref1) res =  symbol->ref1->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref2) res =  symbol->ref2->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref3) res =  symbol->ref3->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref4) res =  symbol->ref4->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref5) return symbol->ref5->accept(*this);			\
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  return NULL;								\
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}
0
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#define SYM_REF6(class_name_c, ref1, ref2, ref3, ref4, ref5, ref6)	\
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void *search_visitor_c::visit(class_name_c *symbol) {			\
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  void *res = NULL;							\
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  if (symbol->ref1) res =  symbol->ref1->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref2) res =  symbol->ref2->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref3) res =  symbol->ref3->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref4) res =  symbol->ref4->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref5) res =  symbol->ref5->accept(*this);			\
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  if (res != NULL)  return res;						\
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  if (symbol->ref6) return symbol->ref6->accept(*this);			\
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  return NULL;								\
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}
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#include "absyntax.def"
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#undef SYM_LIST
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#undef SYM_TOKEN
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#undef SYM_REF0
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#undef SYM_REF1
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#undef SYM_REF2
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#undef SYM_REF3
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#undef SYM_REF4
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#undef SYM_REF5
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#undef SYM_REF6
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