absyntax_utils/search_base_type.hh
author Manuele Conti <conti.ma@alice.it>
Sat, 21 Apr 2012 17:42:07 +0200
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child 619 f8c9ac5c529a
permissions -rwxr-xr-x
Start implement lvalue check in IL instruction.
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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) 2003-2012  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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/* Determine the data type on which another data type is based on.
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 * If a new default initial value is given, we DO NOT consider it a
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 * new base class, and continue looking further!
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 *
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 * E.g. TYPE new_int_t : INT; END_TYPE;
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 *      TYPE new_int2_t : INT = 2; END_TYPE;
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 *      TYPE new_subr_t : INT (4..5); END_TYPE;
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 *
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 *    new_int_t is really an INT!!
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 *    new_int2_t is also really an INT!!
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 *    new_subr_t is also really an INT!!
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 *
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 * Note that a FB declaration is also considered a base type, as
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 * we may have FB instances declared of a specific FB type.
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 */
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class search_base_type_c: public null_visitor_c {
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  private:
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    symbol_c *current_type_name;
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    bool is_array;
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    bool is_subrange;
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    bool is_enumerated;
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  public:
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    search_base_type_c(void);
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  public:
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    symbol_c *get_basetype_decl(symbol_c *symbol);
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    symbol_c *get_basetype_id  (symbol_c *symbol);
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    bool type_is_subrange(symbol_c* type_decl);
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    bool type_is_enumerated(symbol_c* type_decl);
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  public:
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  /*************************/
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  /* B.1 - Common elements */
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  /*************************/
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  /*******************************************/
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  /* B 1.1 - Letters, digits and identifiers */
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  /*******************************************/
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    void *visit(identifier_c *type_name);
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  /*********************/
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  /* B 1.2 - Constants */
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  /*********************/
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  /******************************/
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  /* B 1.2.1 - Numeric Literals */
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  /******************************/
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     /* Numeric literals without any explicit type cast have unknown data type, 
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      * so we continue considering them as their own basic data types until
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      * they can be resolved (for example, when using '30+x' where 'x' is a LINT variable, the
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      * numeric literal '30' must then be considered a LINT so the ADD function may be called
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      * with all inputs of the same data type.
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      * If 'x' were a SINT, then the '30' would have to be a SINT too!
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      */
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    void *visit(real_c *symbol);
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    void *visit(neg_real_c *symbol);
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    void *visit(integer_c *symbol);
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    void *visit(neg_integer_c *symbol);
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    void *visit(binary_integer_c *symbol);
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    void *visit(octal_integer_c *symbol);
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    void *visit(hex_integer_c *symbol);
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    void *visit(boolean_true_c *symbol);
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    void *visit(boolean_false_c *symbol);
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  /***********************************/
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  /* B 1.3.1 - Elementary Data Types */
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  /***********************************/
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    void *visit(time_type_name_c *symbol);
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    void *visit(bool_type_name_c *symbol);
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    void *visit(sint_type_name_c *symbol);
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    void *visit(int_type_name_c *symbol);
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    void *visit(dint_type_name_c *symbol);
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    void *visit(lint_type_name_c *symbol);
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    void *visit(usint_type_name_c *symbol);
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    void *visit(uint_type_name_c *symbol);
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    void *visit(udint_type_name_c *symbol);
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    void *visit(ulint_type_name_c *symbol);
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    void *visit(real_type_name_c *symbol);
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    void *visit(lreal_type_name_c *symbol);
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    void *visit(date_type_name_c *symbol);
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    void *visit(tod_type_name_c *symbol);
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    void *visit(dt_type_name_c *symbol)	;
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    void *visit(byte_type_name_c *symbol);
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    void *visit(word_type_name_c *symbol);
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    void *visit(dword_type_name_c *symbol);
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    void *visit(lword_type_name_c *symbol);
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    void *visit(string_type_name_c *symbol);
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    void *visit(wstring_type_name_c *symbol);
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    /******************************************************/
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    /* Extensions to the base standard as defined in      */
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    /* "Safety Software Technical Specification,          */
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    /*  Part 1: Concepts and Function Blocks,             */
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    /*  Version 1.0 – Official Release"                   */
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    /* by PLCopen - Technical Committee 5 - 2006-01-31    */
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    /******************************************************/
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    void *visit(safetime_type_name_c *symbol);
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    void *visit(safebool_type_name_c *symbol);
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    void *visit(safesint_type_name_c *symbol);
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    void *visit(safeint_type_name_c *symbol);
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    void *visit(safedint_type_name_c *symbol);
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    void *visit(safelint_type_name_c *symbol);
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    void *visit(safeusint_type_name_c *symbol);
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    void *visit(safeuint_type_name_c *symbol);
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    void *visit(safeudint_type_name_c *symbol);
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    void *visit(safeulint_type_name_c *symbol);
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    void *visit(safereal_type_name_c *symbol);
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    void *visit(safelreal_type_name_c *symbol);
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    void *visit(safedate_type_name_c *symbol);
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    void *visit(safetod_type_name_c *symbol);
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    void *visit(safedt_type_name_c *symbol)	;
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    void *visit(safebyte_type_name_c *symbol);
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    void *visit(safeword_type_name_c *symbol);
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    void *visit(safedword_type_name_c *symbol);
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    void *visit(safelword_type_name_c *symbol);
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    void *visit(safestring_type_name_c *symbol);
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    void *visit(safewstring_type_name_c *symbol);
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  /********************************/
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  /* B 1.3.3 - Derived data types */
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  /********************************/
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  /*  simple_type_name ':' simple_spec_init */
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    void *visit(simple_type_declaration_c *symbol);
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  /* simple_specification ASSIGN constant */
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    void *visit(simple_spec_init_c *symbol);
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  /*  subrange_type_name ':' subrange_spec_init */
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    void *visit(subrange_type_declaration_c *symbol);
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  /* subrange_specification ASSIGN signed_integer */
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    void *visit(subrange_spec_init_c *symbol);
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  /*  integer_type_name '(' subrange')' */
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    void *visit(subrange_specification_c *symbol);
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  /*  signed_integer DOTDOT signed_integer */
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    void *visit(subrange_c *symbol);
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  /*  enumerated_type_name ':' enumerated_spec_init */
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    void *visit(enumerated_type_declaration_c *symbol);
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  /* enumerated_specification ASSIGN enumerated_value */
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    void *visit(enumerated_spec_init_c *symbol);
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  /* helper symbol for enumerated_specification->enumerated_spec_init */
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  /* enumerated_value_list ',' enumerated_value */
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    void *visit(enumerated_value_list_c *symbol);
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  /* enumerated_type_name '#' identifier */
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  // SYM_REF2(enumerated_value_c, type, value)
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    void *visit(enumerated_value_c *symbol);
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  /*  identifier ':' array_spec_init */
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    void *visit(array_type_declaration_c *symbol);
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  /* array_specification [ASSIGN array_initialization} */
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  /* array_initialization may be NULL ! */
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    void *visit(array_spec_init_c *symbol);
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  /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
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    void *visit(array_specification_c *symbol);
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  /* helper symbol for array_specification */
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  /* array_subrange_list ',' subrange */
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    void *visit(array_subrange_list_c *symbol);
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  /* array_initialization:  '[' array_initial_elements_list ']' */
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  /* helper symbol for array_initialization */
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  /* array_initial_elements_list ',' array_initial_elements */
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    void *visit(array_initial_elements_list_c *symbol);
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  /* integer '(' [array_initial_element] ')' */
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  /* array_initial_element may be NULL ! */
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    void *visit(array_initial_elements_c *symbol);
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  /*  structure_type_name ':' structure_specification */
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      /* NOTE: structure_specification will point to either a
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       *       initialized_structure_c
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       *       OR A
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       *       structure_element_declaration_list_c
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       */
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    void *visit(structure_type_declaration_c *symbol);
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  /* structure_type_name ASSIGN structure_initialization */
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  /* structure_initialization may be NULL ! */
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    void *visit(initialized_structure_c *symbol);
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  /* helper symbol for structure_declaration */
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  /* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
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  /* structure_element_declaration_list structure_element_declaration ';' */
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    void *visit(structure_element_declaration_list_c *symbol);
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  /*  structure_element_name ':' *_spec_init */
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    void *visit(structure_element_declaration_c *symbol);
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  /* helper symbol for structure_initialization */
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  /* structure_initialization: '(' structure_element_initialization_list ')' */
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  /* structure_element_initialization_list ',' structure_element_initialization */
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    void *visit(structure_element_initialization_list_c *symbol);
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  /*  structure_element_name ASSIGN value */
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    void *visit(structure_element_initialization_c *symbol);
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  /*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
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  /*
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  SYM_REF4(string_type_declaration_c,	string_type_name,
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  					elementary_string_type_name,
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  					string_type_declaration_size,
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  					string_type_declaration_init) // may be == NULL!
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  */
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    void *visit(string_type_declaration_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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  // SYM_REF3(function_block_declaration_c, fblock_name, var_declarations, fblock_body)
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    void *visit(function_block_declaration_c *symbol);
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181
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}; // search_base_type_c
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