absyntax_utils/add_en_eno_param_decl.hh
author Manuele Conti <manuele.conti@sirius-es.it>
Thu, 30 Aug 2012 15:06:32 +0200
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permissions -rwxr-xr-x
Update configure script.
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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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 *  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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 * Iterate through all declared functions and Function Blocks, 
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 * and, for each function/FB, add a declaration of the EN and ENO 
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 * parameters, if they have not already been explicitly declared.
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 *
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 * EN and ENO parameters declared explicitly (by the user in the source code)
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 * and implicitly (by the comnpiler, i.e. by this visitor class) may be
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 * distinguished later on by the 'method' flag in the en_param_declaration_c
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 * and eno_param_declaration_c objects.
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 */
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#include "../absyntax/visitor.hh"
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class add_en_eno_param_decl_c : public null_visitor_c {
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  public:
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    static symbol_c *add_to(symbol_c *tree_root);
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    ~add_en_eno_param_decl_c(void);
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  private:
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    /* this class is a singleton. So we need a pointer to the single instance... */
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    static add_en_eno_param_decl_c *singleton;
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    /* flags to remember whether the EN and/or ENO parameters have already
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     * been explicitly declared by the user in the IEC 61131-3 source code we are parsing...
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     */
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    bool en_declared;
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    bool eno_declared;
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  private:
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    void* iterate_list(list_c *list);
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    input_declarations_c  *build_en_param (void);
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    output_declarations_c *build_eno_param(void);
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  private:
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    /***************************/
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    /* B 0 - Programming Model */
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    /***************************/
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    void *visit(library_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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    /******************************************/
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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(en_param_declaration_c *symbol);
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    void *visit(eno_param_declaration_c *symbol);
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    void *visit(output_declarations_c *symbol);
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    void *visit(var_init_decl_list_c *symbol);
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    /*****************************/
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    /* B 1.5.2 - 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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}; // function_param_iterator_c
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