absyntax/absyntax.hh
author mjsousa
Sun, 14 Dec 2014 19:15:29 +0000
changeset 964 5f4dfe6670da
parent 958 7474d2cd1d6e
child 965 c9eeb67ba939
permissions -rwxr-xr-x
Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
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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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 * Declaration of the Abstract Syntax data structure components
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 */
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/*
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 * ABSYNTAX.H
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 *
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 * This generates the parse tree structure used to bind the components
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 * identified by Bison in the correct syntax order. At the end of the
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 * Bison analysis the tree is walked in a sequential fashion generating
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 * the relavent code.
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 */
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#ifndef _ABSYNTAX_HH
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#define _ABSYNTAX_HH
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#include <stdio.h> // required for NULL
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#include <vector>
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#include <map>
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#include <string>
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#include <stdint.h>  // required for uint64_t, etc...
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#include "../main.hh" // required for uint8_t, real_64_t, ..., and the macros INT8_MAX, REAL32_MAX, ... */
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/* Forward declaration of the visitor interface
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 * declared in the visitor.hh file
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 * We cannot include the visitor.hh file, as it will
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 * include this same file first, as it too requires references
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 * to the abstract syntax classes defined here.
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 */
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class visitor_c; // forward declaration
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class symbol_c; // forward declaration
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/* Case insensitive string compare */
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  /* Case insensitive string compare copied from
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   * "The C++ Programming Language" - 3rd Edition
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   * by Bjarne Stroustrup, ISBN 0201889544.
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   */
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class nocasecmp_c {
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    public:
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      bool operator() (const std::string& x, const std::string& y) const {
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        std::string::const_iterator ix = x.begin();
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        std::string::const_iterator iy = y.begin();
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        for(; (ix != x.end()) && (iy != y.end()) && (toupper(*ix) == toupper(*iy)); ++ix, ++iy);
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        if (ix == x.end()) return (iy != y.end());
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        if (iy == y.end()) return false;
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        return (toupper(*ix) < toupper(*iy));
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      };
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  };
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/* The base class of all symbols */
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class symbol_c {
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  public:
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    /* WARNING: only use this method for debugging purposes!! */
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    virtual const char *absyntax_cname(void) {return "symbol_c";};
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    /*
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     * Annotations produced during stage 1_2
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     */    
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    /* Points to the parent symbol in the AST, i.e. the symbol in the AST that will contain the current symbol */
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    symbol_c *parent; 
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    /* Line number for the purposes of error checking.  */
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    int first_line;
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    int first_column;
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    const char *first_file;  /* filename referenced by first line/column */
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    long int first_order;    /* relative order in which it is read by lexcial analyser */
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    int last_line;
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    int last_column;
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    const char *last_file;  /* filename referenced by last line/column */
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    long int last_order;    /* relative order in which it is read by lexcial analyser */
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    /*
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     * Annotations produced during stage 3
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     */    
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    /*** Data type analysis ***/
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    std::vector <symbol_c *> candidate_datatypes; /* All possible data types the expression/literal/etc. may take. Filled in stage3 by fill_candidate_datatypes_c class */
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    /* Data type of the expression/literal/etc. Filled in stage3 by narrow_candidate_datatypes_c 
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     * If set to NULL, it means it has not yet been evaluated.
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     * If it points to an object of type invalid_type_name_c, it means it is invalid.
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     * Otherwise, it points to an object of the apropriate data type (e.g. int_type_name_c, bool_type_name_c, ...)
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     */
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    symbol_c *datatype;
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    /* The POU in which the symbolic variable (or structured variable, or array variable, or located variable, - any more?)
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     * was declared. This will point to a Configuration, Resource, Program, FB, or Function.
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     * This is set in stage 3 by the datatype analyser algorithm (fill/narrow) for the symbols:
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     *  symbolic_variable_c, array_variable_c, structured_variable_c
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     */
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    symbol_c *scope;    
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    /*** constant folding ***/
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    /* During stage 3 (semantic analysis/checking) we will be doing constant folding.
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     * That algorithm will anotate the abstract syntax tree with the result of operations
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     * on literals (i.e. 44 + 55 will store the result 99).
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     * Since the same source code (e.g. 1 + 0) may actually be a BOOL or an ANY_INT,
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     * or an ANY_BIT, we need to handle all possibilities, and determine the result of the
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     * operation assuming each type.
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     * For this reason, we have one entry for each possible type, with some expressions
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     * having more than one entry filled in!
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     */
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    typedef enum { cs_undefined,   /* not defined/not yet evaluated --> const_value is not valid! */
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                   cs_non_const,   /* we have determined that expression is not a const value --> const_value is not valid! */
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                   cs_const_value, /* const value is valid */
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                   cs_overflow     /* result produced overflow or underflow --> const_value is not valid! */
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                 } const_status_t;
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    typedef struct const_value_real64_s {const_status_t status;  real64_t  value;  const_value_real64_s (): status(cs_undefined), value(0.0)   {} } const_value_real64_t;
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    typedef struct const_value_int64_s  {const_status_t status;   int64_t  value;  const_value_int64_s  (): status(cs_undefined), value(0)     {} } const_value_int64_t;
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    typedef struct const_value_uint64_s {const_status_t status;  uint64_t  value;  const_value_uint64_s (): status(cs_undefined), value(0)     {} } const_value_uint64_t;
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    typedef struct const_value_bool_s   {const_status_t status;      bool  value;  const_value_bool_s   (): status(cs_undefined), value(false) {} } const_value_bool_t;
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    typedef struct {
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      const_value_real64_t _real64; /* status is initialised to UNDEFINED */
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      const_value_int64_t   _int64; /* status is initialised to UNDEFINED */
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      const_value_uint64_t _uint64; /* status is initialised to UNDEFINED */
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      const_value_bool_t     _bool; /* status is initialised to UNDEFINED */
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    } const_value_t;
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    const_value_t const_value;
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    /*** Enumeration datatype checking ***/    
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    /* Not all symbols will contain the following anotations, which is why they are not declared here in symbol_c
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     * They will be declared only inside the symbols that require them (have a look at absyntax.def)
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     */
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    typedef std::multimap<std::string, symbol_c *, nocasecmp_c> enumvalue_symtable_t;
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    /*
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     * Annotations produced during stage 4
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     */
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    /* Since we support several distinct stage_4 implementations, having explicit entries for each
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     * possible use would quickly get out of hand.
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     * We therefore simply add a map, that each stage 4 may use for all its needs.
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     */
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    typedef std::map<std::string, symbol_c *> anotations_map_t;
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    anotations_map_t anotations_map;
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  public:
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    /* default constructor */
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    symbol_c(int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */
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             int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0  /* order in which it is read by lexcial analyser */
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            );
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    /* default destructor */
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    /* must be virtual so compiler does not complain... */ 
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    virtual ~symbol_c(void) {return;};
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    virtual void *accept(visitor_c &visitor) {return NULL;};
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};
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class token_c: public symbol_c {
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  public:
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    /* WARNING: only use this method for debugging purposes!! */
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    virtual const char *absyntax_cname(void) {return "token_c";};
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    /* the value of the symbol. */
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    const char *value;
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  public:
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    token_c(const char *value, 
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            int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */
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            int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0  /* order in which it is read by lexcial analyser */
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           );
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};
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 /* a list of symbols... */
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class list_c: public symbol_c {
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  public:
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    /* WARNING: only use this method for debugging purposes!! */
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    virtual const char *absyntax_cname(void) {return "list_c";};
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    int c,n; /* c: current capacity of list (malloc'd memory);  n: current number of elements in list */
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    symbol_c **elements;
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  public:
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    list_c(int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */
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           int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0  /* order in which it is read by lexcial analyser */
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          );
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    list_c(symbol_c *elem, 
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           int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */
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           int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0  /* order in which it is read by lexcial analyser */
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          );
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     /* append a new element to the end of the list */
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    virtual void add_element(symbol_c *elem);
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     /* insert a new element before position pos. */
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     /* To insert into the begining of list, call with pos=0  */
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     /* To insert into the end of list, call with pos=list->n */
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    virtual void insert_element(symbol_c *elem, int pos = 0);
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     /* remove element at position pos. */
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    virtual void remove_element(int pos = 0);
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     /* remove all elements from list. Does not delete the elements in the list! */ 
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    virtual void clear(void);
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};
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#define SYM_LIST(class_name_c, ...)											\
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class class_name_c:	public list_c {											\
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  public:														\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(													\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    class_name_c(symbol_c *elem, 											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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};
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#define SYM_TOKEN(class_name_c, ...)											\
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class class_name_c: 	public token_c {										\
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  public:														\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(const char *value, 											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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};
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#define SYM_REF0(class_name_c, ...)											\
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class class_name_c: public symbol_c {											\
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  public:														\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(		 											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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};
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#define SYM_REF1(class_name_c, ref1, ...)										\
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class class_name_c: public symbol_c {											\
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  public:														\
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    symbol_c *ref1;													\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(symbol_c *ref1,											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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};
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#define SYM_REF2(class_name_c, ref1, ref2, ...)										\
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class class_name_c: public symbol_c {											\
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  public:														\
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    symbol_c *ref1;													\
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    symbol_c *ref2;													\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(symbol_c *ref1,											\
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		 symbol_c *ref2 = NULL,											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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};
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#define SYM_REF3(class_name_c, ref1, ref2, ref3, ...)									\
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class class_name_c: public symbol_c {											\
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  public:														\
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    symbol_c *ref1;													\
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    symbol_c *ref2;													\
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    symbol_c *ref3;													\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(symbol_c *ref1,											\
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		 symbol_c *ref2,											\
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		 symbol_c *ref3,											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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};
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#define SYM_REF4(class_name_c, ref1, ref2, ref3, ref4, ...)								\
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class class_name_c: public symbol_c {											\
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  public:														\
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    symbol_c *ref1;													\
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    symbol_c *ref2;													\
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    symbol_c *ref3;													\
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    symbol_c *ref4;													\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(symbol_c *ref1,											\
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		 symbol_c *ref2,											\
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		 symbol_c *ref3,											\
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		 symbol_c *ref4 = NULL,											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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};
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#define SYM_REF5(class_name_c, ref1, ref2, ref3, ref4, ref5, ...)							\
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class class_name_c: public symbol_c {											\
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  public:														\
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    symbol_c *ref1;													\
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    symbol_c *ref2;													\
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    symbol_c *ref3;													\
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    symbol_c *ref4;													\
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    symbol_c *ref5;													\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(symbol_c *ref1,											\
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		 symbol_c *ref2,											\
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		 symbol_c *ref3,											\
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		 symbol_c *ref4,											\
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		 symbol_c *ref5,											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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};
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#define SYM_REF6(class_name_c, ref1, ref2, ref3, ref4, ref5, ref6, ...)							\
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class class_name_c: public symbol_c {											\
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  public:														\
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    symbol_c *ref1;													\
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    symbol_c *ref2;													\
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    symbol_c *ref3;													\
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    symbol_c *ref4;													\
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    symbol_c *ref5;													\
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    symbol_c *ref6;													\
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    __VA_ARGS__														\
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  public:														\
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    class_name_c(symbol_c *ref1,											\
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		 symbol_c *ref2,											\
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		 symbol_c *ref3,											\
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		 symbol_c *ref4,											\
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		 symbol_c *ref5,											\
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		 symbol_c *ref6 = NULL,											\
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                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\
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                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\
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    virtual void *accept(visitor_c &visitor);										\
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    /* WARNING: only use this method for debugging purposes!! */							\
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    virtual const char *absyntax_cname(void) {return #class_name_c;};							\
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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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#endif /*  _ABSYNTAX_HH */