absyntax_utils/function_param_iterator.hh
author Mario de Sousa <msousa@fe.up.pt>
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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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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 * Function parameter iterator.
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 * Iterate through the in/out parameters of a function declaration.
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 * Function blocks are also suported.
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 *
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 * This is part of the 4th stage that generates
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 * a c++ source program equivalent to the IL and ST
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 * code.
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 */
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/* Given a function_declaration_c, iterate through each
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 * function in/out/inout parameter, returning the name
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 * of each parameter...function_param_iterator_c
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 */
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#include "../absyntax/visitor.hh"
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class function_param_iterator_c : public null_visitor_c {
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  public:
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    /* A type to specify the type of parameter.
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     * VAR_INPUT => direction_in
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     * VAR_OUTPUT => direction_out
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     * VAR_IN_OUT => direction_inout
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     * VAR_EXTERNAL => direction_extref
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     *
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     * Note that VAR_EXTERNAL declares variables that are in reality references
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     * to global variables. This is used only inside programs!
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     * These references to external variables must be correctly initialised to refer
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     * to the correct global variable. Note that the user may define which variable is to be
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     * referenced in a CONFIGURATION, and that different instantiations of a program
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     * may have the same external variable reference diffenrent global variables!
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     * The references must therefore be correctly initialised when the program instance
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     * is created. This may be done by the PROGRAM class constructor since the ST and IL
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     * languages do not allow the VAR_EXTERNAL reference to change at runtime
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     * for a specific instance.
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     *
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     * We therefore need to call a PROGRAM class constructor with the variables
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     * that should be refernced by the VAR_EXTERNAL variables. The direction_extref will
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     * be used to identify these parameters!
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     */
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    typedef enum {direction_in, direction_out, direction_inout, direction_extref} param_direction_t ;
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  private:
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    /* a pointer to the function_block_declaration_c
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    * or function_declaration_c currently being analysed.
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    */
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    symbol_c *f_decl;
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    int next_param, param_count;
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    /* used when called to search() for a parameter by name */
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    identifier_c *search_param_name;
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    /* used when called to iterate() for a parameter */
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    identifier_c *current_param_name;
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    symbol_c *current_param_type;
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    symbol_c *current_param_default_value;
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    param_direction_t current_param_direction;
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    bool en_eno_param_implicit;
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    /* Which operation of the class was called...
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     * Search a parameter, or iterate to the next parameter.
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     */
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    typedef enum {iterate_op, search_op} operation_t;
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    operation_t current_operation;
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  private:
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    void* handle_param_list(list_c *list);
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    void* handle_single_param(symbol_c *var_name);
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    void* iterate_list(list_c *list);
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  public:
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    /* start off at the first parameter once again... */
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    void reset(void);
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    /* initialise the iterator object.
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     * We must be given a reference to one of the following
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     *     - function_declaration_c
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     *     - function_block_declaration_c
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     *     - program_declaration_c
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     * that will be analysed...
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     */
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    function_param_iterator_c(symbol_c *pou_decl);
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    /* Skip to the next parameter. After object creation,
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     * the object references on parameter _before_ the first, so
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     * this function must be called once to get the object to
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     * reference the first parameter...
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     *
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     * Returns the parameter's name!
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     */
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    identifier_c *next(void);
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    /* Search for the parameter named <param_name>...  */
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    /* The seach() function does not in any way affect the internal state related 
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     * to the iterate() function.
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     * It will, however, affect the internal state necessary to correctly
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     * return the param_type() and default_value() of the found parameter.
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     */
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    identifier_c *search(symbol_c *param_name);
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    /* Returns the currently referenced parameter's default value,
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     * or NULL if none is specified in the function declrataion itself.
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     */
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    symbol_c *default_value(void);
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    /* Returns the currently referenced parameter's type name. */
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    symbol_c *param_type(void);
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    /* Returns if currently referenced parameter is an implicit defined EN/ENO parameter. */
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    bool is_en_eno_param_implicit(void);
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181
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    /* Returns the currently referenced parameter's data passing direction.
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     * i.e. VAR_INPUT, VAR_OUTPUT or VAR_INOUT
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     */
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    param_direction_t param_direction(void);
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    private:
233
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    void *visit(implicit_definition_c *symbol);
181
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    /******************************************/
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    /* B 1.4.3 - Declaration & Initialisation */
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    /******************************************/
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    void *visit(input_declarations_c *symbol);
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    void *visit(input_declaration_list_c *symbol);
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    void *visit(edge_declaration_c *symbol);
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    void *visit(en_param_declaration_c *symbol);
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    /* var1_list ':' array_spec_init */
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    //SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)
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    void *visit(array_var_init_decl_c *symbol);
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    /*  var1_list ':' initialized_structure */
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    //SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)
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    void *visit(structured_var_init_decl_c *symbol);
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#if 0
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/* name_list ':' function_block_type_name ASSIGN structure_initialization */
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/* structure_initialization -> may be NULL ! */
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SYM_REF4(fb_name_decl_c, fb_name_list, function_block_type_name, structure_initialization, unused)
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/* name_list ',' fb_name */
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SYM_LIST(fb_name_list_c)
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#endif
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    void *visit(output_declarations_c *symbol);
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    void *visit(eno_param_declaration_c *symbol);
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    void *visit(input_output_declarations_c *symbol);
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    void *visit(var_declaration_list_c *symbol);
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    /*  var1_list ':' array_specification */
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    //SYM_REF2(array_var_declaration_c, var1_list, array_specification)
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    void *visit(array_var_declaration_c *symbol);
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    /*  var1_list ':' structure_type_name */
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    //SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)
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    void *visit(structured_var_declaration_c *symbol);
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    /* VAR [CONSTANT] var_init_decl_list END_VAR */
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    void *visit(var_declarations_c *symbol);
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#if 0
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/*  VAR RETAIN var_init_decl_list END_VAR */
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SYM_REF2(retentive_var_declarations_c, var_init_decl_list, unused)
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/*  VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
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/* option -> may be NULL ! */
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SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
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/* helper symbol for located_var_declarations */
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/* located_var_decl_list located_var_decl ';' */
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SYM_LIST(located_var_decl_list_c)
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/*  [variable_name] location ':' located_var_spec_init */
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/* variable_name -> may be NULL ! */
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SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
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#endif
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    /*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
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    /* option -> may be NULL ! */
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    // SYM_REF2(external_var_declarations_c, option, external_declaration_list)
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    void *visit(external_var_declarations_c *symbol);
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    /* helper symbol for external_var_declarations */
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    /*| external_declaration_list external_declaration';' */
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    // SYM_LIST(external_declaration_list_c)
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    void *visit(external_declaration_list_c *symbol);
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    /*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
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    //SYM_REF2(external_declaration_c, global_var_name, specification)
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    void *visit(external_declaration_c *symbol);
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#if 0
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/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
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/* option -> may be NULL ! */
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SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
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/* helper symbol for global_var_declarations */
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/*| global_var_decl_list global_var_decl ';' */
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SYM_LIST(global_var_decl_list_c)
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/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
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/* type_specification ->may be NULL ! */
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SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
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/*| global_var_name location */
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SYM_REF2(global_var_spec_c, global_var_name, location)
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/*  AT direct_variable */
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SYM_REF2(location_c, direct_variable, unused)
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/*| global_var_list ',' global_var_name */
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SYM_LIST(global_var_list_c)
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/*  var1_list ':' single_byte_string_spec */
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SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
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/*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
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/* integer ->may be NULL ! */
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/* single_byte_character_string ->may be NULL ! */
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SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
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/*  var1_list ':' double_byte_string_spec */
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SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
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/*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
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/* integer ->may be NULL ! */
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/* double_byte_character_string ->may be NULL ! */
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SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
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/*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */
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/* option ->may be NULL ! */
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SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list)
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/* helper symbol for incompl_located_var_declarations */
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/*| incompl_located_var_decl_list incompl_located_var_decl ';' */
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SYM_LIST(incompl_located_var_decl_list_c)
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/*  variable_name incompl_location ':' var_spec */
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SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
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/*  AT incompl_location_token */
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SYM_TOKEN(incompl_location_c)
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#endif
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    void *visit(var1_init_decl_c *symbol);
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    void *visit(var1_list_c *symbol);
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    void *visit(var_init_decl_list_c *symbol);
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    /***********************/
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    /* B 1.5.1 - Functions */
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    /***********************/
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    void *visit(function_declaration_c *symbol);
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    /* intermediate helper symbol for function_declaration */
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    void *visit(var_declarations_list_c *symbol);
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    void *visit(function_var_decls_c *symbol);
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    /*****************************/
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    /* B 1.5.2 - Function Blocks */
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    /*****************************/
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    /*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
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    void *visit(function_block_declaration_c *symbol);
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    /* intermediate helper symbol for function_declaration */
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    /*  { io_var_declarations | other_var_declarations }   */
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    /*
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     * NOTE: we re-use the var_declarations_list_c
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     */
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    /*  VAR_TEMP temp_var_decl_list END_VAR */
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    void *visit(temp_var_decls_c *symbol);
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    void *visit(temp_var_decls_list_c *symbol);
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    /*  VAR NON_RETAIN var_init_decl_list END_VAR */
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    void *visit(non_retentive_var_decls_c *symbol);
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    /**********************/
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    /* B 1.5.3 - Programs */
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    /**********************/
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    /*  PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */
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    // SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused)
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    void *visit(program_declaration_c *symbol);
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    /* intermediate helper symbol for program_declaration_c */
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    /*  { io_var_declarations | other_var_declarations }   */
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    /*
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     * NOTE: we re-use the var_declarations_list_c
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     */
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}; // function_param_iterator_c
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