ccb@202: /*
msousa@265:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
ccb@202:  *
msousa@265:  *  Copyright (C) 2009-2011  Mario de Sousa (msousa@fe.up.pt)
Edouard@279:  *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
ccb@202:  *
msousa@265:  *  This program is free software: you can redistribute it and/or modify
msousa@265:  *  it under the terms of the GNU General Public License as published by
msousa@265:  *  the Free Software Foundation, either version 3 of the License, or
msousa@265:  *  (at your option) any later version.
msousa@265:  *
msousa@265:  *  This program is distributed in the hope that it will be useful,
msousa@265:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@265:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
msousa@265:  *  GNU General Public License for more details.
msousa@265:  *
msousa@265:  *  You should have received a copy of the GNU General Public License
msousa@265:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
msousa@265:  *
ccb@202:  *
ccb@202:  * This code is made available on the understanding that it will not be
ccb@202:  * used in safety-critical situations without a full and competent review.
ccb@202:  */
ccb@202: 
ccb@202: /*
msousa@265:  * An IEC 61131-3 compiler.
ccb@202:  *
ccb@202:  * Based on the
ccb@202:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
ccb@202:  *
ccb@202:  */
ccb@202: 
ccb@202: 
ccb@202: /*
ccb@202:  * Iterate through all declared functions and Function Blocks, 
ccb@202:  * and, for each function/FB, add a declaration of the EN and ENO 
ccb@202:  * parameters, if they have not already been explicitly declared.
ccb@202:  *
ccb@202:  * EN and ENO parameters declared explicitly (by the user in the source code)
ccb@202:  * and implicitly (by the comnpiler, i.e. by this visitor class) may be
ccb@202:  * distinguished later on by the 'method' flag in the en_param_declaration_c
ccb@202:  * and eno_param_declaration_c objects.
ccb@202:  */
ccb@202: 
ccb@202: #include "../absyntax/visitor.hh"
ccb@202: 
ccb@202: 
ccb@202: class add_en_eno_param_decl_c : public null_visitor_c {
ccb@202:   public:
ccb@202:     static symbol_c *add_to(symbol_c *tree_root);
ccb@202:     ~add_en_eno_param_decl_c(void);
ccb@202: 
ccb@202:   private:
ccb@202:     /* this class is a singleton. So we need a pointer to the single instance... */
ccb@202:     static add_en_eno_param_decl_c *singleton;
ccb@202: 
ccb@202:     /* flags to remember whether the EN and/or ENO parameters have already
ccb@202:      * been explicitly declared by the user in the IEC 61131-3 source code we are parsing...
ccb@202:      */
ccb@202:     bool en_declared;
ccb@202:     bool eno_declared;
ccb@202: 
ccb@202:   private:
ccb@202:     void* iterate_list(list_c *list);
ccb@202:     input_declarations_c  *build_en_param (void);
ccb@202:     output_declarations_c *build_eno_param(void);
ccb@202: 
ccb@202:   private:
ccb@202:     /***************************/
ccb@202:     /* B 0 - Programming Model */
ccb@202:     /***************************/
ccb@202:     void *visit(library_c *symbol);
ccb@202: 
ccb@202:     /***********************/
ccb@202:     /* B 1.5.1 - Functions */
ccb@202:     /***********************/
ccb@202:     void *visit(function_declaration_c *symbol);
ccb@202:     /* intermediate helper symbol for function_declaration */
ccb@202:     void *visit(var_declarations_list_c *symbol);
ccb@202: 
ccb@202:     /******************************************/
ccb@202:     /* B 1.4.3 - Declaration & Initialisation */
ccb@202:     /******************************************/
ccb@202:     void *visit(input_declarations_c *symbol);
ccb@202:     void *visit(input_declaration_list_c *symbol);
ccb@202:     void *visit(en_param_declaration_c *symbol);
ccb@202:     void *visit(eno_param_declaration_c *symbol);
ccb@202:     void *visit(output_declarations_c *symbol);
ccb@202:     void *visit(var_init_decl_list_c *symbol);
ccb@202: 
ccb@202:     /*****************************/
ccb@202:     /* B 1.5.2 - Function Blocks */
ccb@202:     /*****************************/
ccb@202:     /*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
ccb@202:     void *visit(function_block_declaration_c *symbol);
ccb@202: 
ccb@202: }; // function_param_iterator_c
ccb@202: 
ccb@202: 
ccb@202: 
ccb@202: 
ccb@202: 
ccb@202: 
ccb@202: