absyntax_utils/absyntax_utils.cc
author Mario de Sousa <msousa@fe.up.pt>
Fri, 10 Jun 2011 10:13:15 +0100
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child 328 66cd5d9893dd
permissions -rwxr-xr-x
Clean up some code.
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2009-2011  Mario de Sousa (msousa@fe.up.pt)
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c0453b7f99df Re-generated std lib related code, with updated headers, updated all forgotten headers
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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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 * This is the main stage 3a file.
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 *
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 * In stage 3a some helpful symbol tables are instanciated and populated.
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 * These symbol tables wll then be used by stage3b and atage4 code generators.
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 */
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// #include <stdio.h>  /* required for NULL */
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#include <string>
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#include <iostream>
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#include <sstream>
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#include <typeinfo>
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#include <list>
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#include <strings.h>
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#include "../util/symtable.hh"
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#include "../util/dsymtable.hh"
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#include "../absyntax/visitor.hh"
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//#define DEBUG
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#ifdef DEBUG
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#define TRACE(classname) printf("\n____%s____\n",classname);
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#else
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#define TRACE(classname)
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#endif
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#define ERROR error_exit(__FILE__,__LINE__)
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/* function defined in main.cc */
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extern void error_exit(const char *file_name, int line_no);
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/* returns 0 if the names are equal!! */
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/* NOTE: it must ignore case!! */
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int compare_identifiers(symbol_c *ident1, symbol_c *ident2) {
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  token_c *name1 = dynamic_cast<token_c *>(ident1);
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  token_c *name2 = dynamic_cast<token_c *>(ident2);
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  if ((name1 == NULL) || (name2 == NULL))
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    /* invalid identifiers... */
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    return -1;
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  if (strcasecmp(name1->value, name2->value) == 0)
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    return 0;
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  /* identifiers do not match! */
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  return 1;
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}
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/* A symbol table with all globally declared functions... */
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function_declaration_c null_symbol1(NULL,NULL,NULL,NULL);
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dsymtable_c<function_declaration_c *, &null_symbol1> function_symtable;
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/* A symbol table with all globally declared functions block types... */
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function_block_declaration_c null_symbol2(NULL,NULL,NULL);
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symtable_c<function_block_declaration_c *, &null_symbol2> function_block_type_symtable;
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/* A symbol table with all globally declared program types... */
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program_declaration_c null_symbol3(NULL,NULL,NULL);
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symtable_c<program_declaration_c *, &null_symbol3> program_type_symtable;
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/* A symbol table with all user declared type definitions... */
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/* Note that function block types and program types have their
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 * own symbol tables, so do not get placed in this symbol table!
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 */
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symbol_c null_symbol4;
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symtable_c<symbol_c *, &null_symbol4> type_symtable;
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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class populate_symtables_c: public iterator_visitor_c {
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  public:
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    populate_symtables_c(void) {};
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    virtual ~populate_symtables_c(void) {}
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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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  /*********************/
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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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  /*******************************/
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  /* B.1.2.2   Character Strings */
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  /*******************************/
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  /***************************/
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  /* B 1.2.3 - Time Literals */
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  /***************************/
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  /************************/
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  /* B 1.2.3.1 - Duration */
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  /************************/
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  /************************************/
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  /* B 1.2.3.2 - Time of day and Date */
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  /************************************/
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  /**********************/
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  /* B.1.3 - Data types */
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  /**********************/
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  /***********************************/
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  /* B 1.3.1 - Elementary Data Types */
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  /***********************************/
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  /********************************/
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  /* B.1.3.2 - Generic data types */
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  /********************************/
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  /********************************/
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  /* B 1.3.3 - Derived data types */
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  /********************************/
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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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    TRACE("subrange_type_declaration_c");  
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    type_symtable.insert(symbol->subrange_type_name, symbol->subrange_spec_init);
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    return NULL;
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  }
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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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    TRACE("enumerated_type_declaration_c");
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    type_symtable.insert(symbol->enumerated_type_name, symbol->enumerated_spec_init);
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    return NULL;
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  }
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  /*  identifier ':' array_spec_init */
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  void *visit(array_type_declaration_c *symbol) {
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    TRACE("array_type_declaration_c");
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    type_symtable.insert(symbol->identifier, symbol->array_spec_init);
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    return NULL;
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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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    TRACE("simple_type_declaration_c");
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    type_symtable.insert(symbol->simple_type_name, symbol->simple_spec_init);
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    return NULL;
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  }
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  /*  structure_type_name ':' structure_specification */
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  void *visit(structure_type_declaration_c *symbol) {
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    TRACE("structure_type_declaration_c");
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    type_symtable.insert(symbol->structure_type_name, symbol->structure_specification);
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    return NULL;
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  }
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  /*********************/
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  /* B 1.4 - Variables */
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  /*********************/
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  /********************************************/
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  /* B.1.4.1   Directly Represented Variables */
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  /********************************************/
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  /*************************************/
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  /* B.1.4.2   Multi-element Variables */
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  /*************************************/
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  /******************************************/
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  /* B 1.4.3 - Declaration & Initialisation */
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  /******************************************/
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  /**************************************/
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  /* B.1.5 - Program organization units */
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  /**************************************/
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  /***********************/
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  /* B 1.5.1 - Functions */
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  /***********************/
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  public:
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  /*   FUNCTION derived_function_name ':' elementary_type_name io_OR_function_var_declarations_list function_body END_FUNCTION */
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  /* | FUNCTION derived_function_name ':' derived_type_name io_OR_function_var_declarations_list function_body END_FUNCTION */
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  void *visit(function_declaration_c *symbol) {
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    TRACE("function_declaration_c");
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    function_symtable.insert(symbol->derived_function_name, symbol);
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    /* symbol->derived_function_name->accept(*this);  */ /* Function name */
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    /* symbol->type_name->accept(*this);              */ /* return data type */
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    /* symbol->var_declarations_list->accept(*this);  */ /* Function parameters and variables */
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    /* symbol->function_body->accept(*this);          */ /* Function body */
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    return NULL;
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  }
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  /*****************************/
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  /* B 1.5.2 - Function Blocks */
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  /*****************************/
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  public:
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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_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused)
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  void *visit(function_block_declaration_c *symbol) {
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    TRACE("function_block_declaration_c");
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    function_block_type_symtable.insert(symbol->fblock_name, symbol);
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  /*
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    symbol->fblock_name->accept(*this);
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    symbol->var_declarations->accept(*this);
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    symbol->fblock_body->accept(*this);
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  */
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    return NULL;
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  }
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  /**********************/
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  /* B 1.5.3 - Programs */
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  /**********************/
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  public:
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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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    TRACE("program_declaration_c");
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    program_type_symtable.insert(symbol->program_type_name, symbol);
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  /*
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    symbol->program_type_name->accept(*this);
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    symbol->var_declarations->accept(*this);
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    symbol->function_block_body->accept(*this);
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  */
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    return NULL;
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  }
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}; /* populate_symtables_c */
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void absyntax_utils_init(symbol_c *tree_root) {
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  populate_symtables_c populate_symbols;
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  tree_root->accept(populate_symbols);
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}
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