absyntax/visitor.hh
author lbessard
Wed, 31 Jan 2007 19:23:46 +0100
changeset 3 38850ee685e6
parent 0 fb772792efd1
child 69 41cb5b80416e
permissions -rwxr-xr-x
ST and IL parsing added into flex-bison analyser
0
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/*
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 * (c) 2003 Mario de Sousa
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 *
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 * Offered to the public under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the
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 * License, or (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, but
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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 * Public License for more details.
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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 IL and ST 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.HH
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 *
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 *
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 * The asbract syntax tree is scaned several times
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 * during the whole compilation process. For e.g., stage 3 verifies
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 * semantics, and stage 4 produces output.
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 *
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 * Since the number of functions that need to scan through
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 * the abtract syntax tree may increase in time, (e.g. new
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 * output formats, new semantic checks, etc...) while the
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 * abstract syntax tree class structure is pretty stable
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 * (i.e. the ST and IL languages will not be changing much...),
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 * we use the 'visitor' design patern.
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 *
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 * It is not strictly necessary to use this pattern, but it does
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 * have the advantage of bringing together the functions
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 * that implement the same algorithm, each on a different
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 * class of object in the abstract syntax tree.
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 *
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 *
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 * This file contains the interface that each visitor class
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 * must implement in order to be able to visit the abstract
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 * syntax tree (class visitor_c)
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 *
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 * Three implementations of this interface are also provided,
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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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#ifndef _VISITOR_HH
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#define _VISITOR_HH
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#include "absyntax.hh"
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#define SYM_LIST(class_name_c)	\
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  virtual void *visit(class_name_c *symbol) = 0;
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#define SYM_TOKEN(class_name_c)	\
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  virtual void *visit(class_name_c *symbol) = 0;
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#define SYM_REF0(class_name_c)	\
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  virtual void *visit(class_name_c *symbol) = 0;
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#define SYM_REF2(class_name_c, ref1, ref2)	\
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  virtual void *visit(class_name_c *symbol) = 0;
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#define SYM_REF4(class_name_c, ref1, ref2, ref3, ref4)	\
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  virtual void *visit(class_name_c *symbol) = 0;
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#define SYM_REF6(class_name_c, ref1, ref2, ref3, ref4, ref5, ref6)	\
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  virtual void *visit(class_name_c *symbol) = 0;
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class visitor_c {
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  public:
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  #include "absyntax.def"
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  virtual ~visitor_c(void);
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};
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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_REF2
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#undef SYM_REF4
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#undef SYM_REF6
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#define SYM_LIST(class_name_c)	\
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  virtual void *visit(class_name_c *symbol);
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#define SYM_TOKEN(class_name_c)	\
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  virtual void *visit(class_name_c *symbol);
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#define SYM_REF0(class_name_c)	\
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  virtual void *visit(class_name_c *symbol);
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#define SYM_REF2(class_name_c, ref1, ref2)	\
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  virtual void *visit(class_name_c *symbol);
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#define SYM_REF4(class_name_c, ref1, ref2, ref3, ref4)	\
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  virtual void *visit(class_name_c *symbol);
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#define SYM_REF6(class_name_c, ref1, ref2, ref3, ref4, ref5, ref6)	\
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  virtual void *visit(class_name_c *symbol);
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class null_visitor_c: public visitor_c {
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  public:
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  #include "absyntax.def"
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  virtual ~null_visitor_c(void);
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};
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class iterator_visitor_c: public visitor_c {
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  protected:
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  void *visit_list(list_c *list);
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  public:
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  #include "absyntax.def"
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  virtual ~iterator_visitor_c(void);
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};
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class search_visitor_c: public visitor_c {
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  protected:
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  void *visit_list(list_c *list);
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  public:
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  #include "absyntax.def"
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  virtual ~search_visitor_c(void);
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};
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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_REF2
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#undef SYM_REF4
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#undef SYM_REF6
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#endif /*  _VISITOR_HH */