ccb@202: /*
ccb@202:  * (c) 2009 Mario de Sousa
ccb@202:  *
ccb@202:  * Offered to the public under the terms of the GNU General Public License
ccb@202:  * as published by the Free Software Foundation; either version 2 of the
ccb@202:  * License, or (at your option) any later version.
ccb@202:  *
ccb@202:  * This program is distributed in the hope that it will be useful, but
ccb@202:  * WITHOUT ANY WARRANTY; without even the implied warranty of
ccb@202:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
ccb@202:  * Public License for more details.
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: /*
ccb@202:  * An IEC 61131-3 IL and ST 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: