mario@181: /* msousa@265: * matiec - a compiler for the programming languages defined in IEC 61131-3 msousa@265: * msousa@265: * Copyright (C) 2003-2011 Mario de Sousa (msousa@fe.up.pt) msousa@265: * 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 . msousa@265: * mario@181: * mario@181: * This code is made available on the understanding that it will not be mario@181: * used in safety-critical situations without a full and competent review. mario@181: */ mario@181: mario@181: /* msousa@265: * An IEC 61131-3 compiler. mario@181: * mario@181: * Based on the mario@181: * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) mario@181: * mario@181: */ mario@181: mario@181: mario@181: /* mario@181: * Function parameter iterator. mario@181: * Iterate through the in/out parameters of a function declaration. mario@181: * Function blocks are also suported. mario@181: * mario@181: * This is part of the 4th stage that generates mario@181: * a c++ source program equivalent to the IL and ST mario@181: * code. mario@181: */ mario@181: mario@181: /* Given a function_declaration_c, iterate through each mario@181: * function in/out/inout parameter, returning the name mario@181: * of each parameter...function_param_iterator_c mario@181: */ mario@181: mario@181: mario@181: #include "../absyntax/visitor.hh" mario@181: mario@181: mario@181: class function_param_iterator_c : public null_visitor_c { mario@181: public: mario@181: /* A type to specify the type of parameter. mario@181: * VAR_INPUT => direction_in mario@181: * VAR_OUTPUT => direction_out mario@181: * VAR_IN_OUT => direction_inout mario@181: * VAR_EXTERNAL => direction_extref mario@181: * mario@181: * Note that VAR_EXTERNAL declares variables that are in reality references mario@181: * to global variables. This is used only inside programs! mario@181: * These references to external variables must be correctly initialised to refer mario@181: * to the correct global variable. Note that the user may define which variable is to be mario@181: * referenced in a CONFIGURATION, and that different instantiations of a program mario@181: * may have the same external variable reference diffenrent global variables! mario@181: * The references must therefore be correctly initialised when the program instance mario@181: * is created. This may be done by the PROGRAM class constructor since the ST and IL mario@181: * languages do not allow the VAR_EXTERNAL reference to change at runtime mario@181: * for a specific instance. mario@181: * mario@181: * We therefore need to call a PROGRAM class constructor with the variables mario@181: * that should be refernced by the VAR_EXTERNAL variables. The direction_extref will mario@181: * be used to identify these parameters! mario@181: */ mario@181: typedef enum {direction_in, direction_out, direction_inout, direction_extref} param_direction_t ; mario@181: mario@181: mario@181: private: ccb@202: /* a pointer to the function_block_declaration_c ccb@202: * or function_declaration_c currently being analysed. ccb@202: */ mario@181: symbol_c *f_decl; mario@181: int next_param, param_count; ccb@202: /* used when called to search() for a parameter by name */ ccb@202: identifier_c *search_param_name; ccb@202: /* used when called to iterate() for a parameter */ mario@181: identifier_c *current_param_name; mario@181: symbol_c *current_param_type; mario@181: symbol_c *current_param_default_value; mario@181: param_direction_t current_param_direction; laurent@233: bool en_eno_param_implicit; ccb@202: /* Which operation of the class was called... ccb@202: * Search a parameter, or iterate to the next parameter. ccb@202: */ ccb@202: typedef enum {iterate_op, search_op} operation_t; ccb@202: operation_t current_operation; mario@181: mario@181: private: mario@181: void* handle_param_list(list_c *list); mario@181: void* handle_single_param(symbol_c *var_name); mario@181: mario@181: void* iterate_list(list_c *list); mario@181: mario@181: public: mario@181: /* start off at the first parameter once again... */ mario@181: void reset(void); mario@181: mario@181: /* initialise the iterator object. ccb@202: * We must be given a reference to one of the following ccb@202: * - function_declaration_c ccb@202: * - function_block_declaration_c ccb@202: * - program_declaration_c mario@181: * that will be analysed... mario@181: */ ccb@202: function_param_iterator_c(symbol_c *pou_decl); mario@181: mario@181: /* Skip to the next parameter. After object creation, mario@181: * the object references on parameter _before_ the first, so mario@181: * this function must be called once to get the object to mario@181: * reference the first parameter... mario@181: * mario@181: * Returns the parameter's name! mario@181: */ mario@181: identifier_c *next(void); mario@181: ccb@202: /* Search for the parameter named ... */ ccb@202: /* The seach() function does not in any way affect the internal state related ccb@202: * to the iterate() function. ccb@202: * It will, however, affect the internal state necessary to correctly ccb@202: * return the param_type() and default_value() of the found parameter. ccb@202: */ ccb@202: identifier_c *search(symbol_c *param_name); mario@181: mario@181: /* Returns the currently referenced parameter's default value, mario@181: * or NULL if none is specified in the function declrataion itself. mario@181: */ mario@181: symbol_c *default_value(void); mario@181: mario@181: /* Returns the currently referenced parameter's type name. */ mario@181: symbol_c *param_type(void); mario@181: laurent@233: /* Returns if currently referenced parameter is an implicit defined EN/ENO parameter. */ laurent@233: bool is_en_eno_param_implicit(void); laurent@233: mario@181: /* Returns the currently referenced parameter's data passing direction. mario@181: * i.e. VAR_INPUT, VAR_OUTPUT or VAR_INOUT mario@181: */ mario@181: param_direction_t param_direction(void); mario@181: mario@181: private: laurent@233: void *visit(implicit_definition_c *symbol); mario@181: /******************************************/ mario@181: /* B 1.4.3 - Declaration & Initialisation */ mario@181: /******************************************/ mario@181: void *visit(input_declarations_c *symbol); mario@181: mario@181: void *visit(input_declaration_list_c *symbol); mario@181: mario@181: void *visit(edge_declaration_c *symbol); mario@181: void *visit(en_param_declaration_c *symbol); mario@181: /* var1_list ':' array_spec_init */ mario@181: //SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init) mario@181: void *visit(array_var_init_decl_c *symbol); mario@181: mario@181: /* var1_list ':' initialized_structure */ mario@181: //SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure) mario@181: void *visit(structured_var_init_decl_c *symbol); mario@181: mario@181: #if 0 mario@181: /* name_list ':' function_block_type_name ASSIGN structure_initialization */ mario@181: /* structure_initialization -> may be NULL ! */ mario@181: SYM_REF4(fb_name_decl_c, fb_name_list, function_block_type_name, structure_initialization, unused) mario@181: mario@181: /* name_list ',' fb_name */ mario@181: SYM_LIST(fb_name_list_c) mario@181: #endif mario@181: mario@181: void *visit(output_declarations_c *symbol); mario@181: void *visit(eno_param_declaration_c *symbol); mario@181: void *visit(input_output_declarations_c *symbol); mario@181: void *visit(var_declaration_list_c *symbol); mario@181: mario@181: mario@181: /* var1_list ':' array_specification */ mario@181: //SYM_REF2(array_var_declaration_c, var1_list, array_specification) mario@181: void *visit(array_var_declaration_c *symbol); mario@181: mario@181: /* var1_list ':' structure_type_name */ mario@181: //SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name) mario@181: void *visit(structured_var_declaration_c *symbol); mario@181: mario@181: /* VAR [CONSTANT] var_init_decl_list END_VAR */ mario@181: void *visit(var_declarations_c *symbol); mario@181: mario@181: #if 0 mario@181: /* VAR RETAIN var_init_decl_list END_VAR */ mario@181: SYM_REF2(retentive_var_declarations_c, var_init_decl_list, unused) mario@181: mario@181: /* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */ mario@181: /* option -> may be NULL ! */ mario@181: SYM_REF2(located_var_declarations_c, option, located_var_decl_list) mario@181: mario@181: /* helper symbol for located_var_declarations */ mario@181: /* located_var_decl_list located_var_decl ';' */ mario@181: SYM_LIST(located_var_decl_list_c) mario@181: mario@181: /* [variable_name] location ':' located_var_spec_init */ mario@181: /* variable_name -> may be NULL ! */ mario@181: SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused) mario@181: #endif mario@181: mario@181: /*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */ mario@181: /* option -> may be NULL ! */ mario@181: // SYM_REF2(external_var_declarations_c, option, external_declaration_list) mario@181: void *visit(external_var_declarations_c *symbol); mario@181: mario@181: /* helper symbol for external_var_declarations */ mario@181: /*| external_declaration_list external_declaration';' */ mario@181: // SYM_LIST(external_declaration_list_c) mario@181: void *visit(external_declaration_list_c *symbol); mario@181: mario@181: /* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */ mario@181: //SYM_REF2(external_declaration_c, global_var_name, specification) mario@181: void *visit(external_declaration_c *symbol); mario@181: mario@181: mario@181: #if 0 mario@181: /*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */ mario@181: /* option -> may be NULL ! */ mario@181: SYM_REF2(global_var_declarations_c, option, global_var_decl_list) mario@181: mario@181: /* helper symbol for global_var_declarations */ mario@181: /*| global_var_decl_list global_var_decl ';' */ mario@181: SYM_LIST(global_var_decl_list_c) mario@181: mario@181: /*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */ mario@181: /* type_specification ->may be NULL ! */ mario@181: SYM_REF2(global_var_decl_c, global_var_spec, type_specification) mario@181: mario@181: /*| global_var_name location */ mario@181: SYM_REF2(global_var_spec_c, global_var_name, location) mario@181: mario@181: /* AT direct_variable */ mario@181: SYM_REF2(location_c, direct_variable, unused) mario@181: mario@181: /*| global_var_list ',' global_var_name */ mario@181: SYM_LIST(global_var_list_c) mario@181: mario@181: /* var1_list ':' single_byte_string_spec */ mario@181: SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec) mario@181: mario@181: /* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */ mario@181: /* integer ->may be NULL ! */ mario@181: /* single_byte_character_string ->may be NULL ! */ mario@181: SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string) mario@181: mario@181: /* var1_list ':' double_byte_string_spec */ mario@181: SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec) mario@181: mario@181: /* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */ mario@181: /* integer ->may be NULL ! */ mario@181: /* double_byte_character_string ->may be NULL ! */ mario@181: SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string) mario@181: mario@181: /*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */ mario@181: /* option ->may be NULL ! */ mario@181: SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list) mario@181: mario@181: /* helper symbol for incompl_located_var_declarations */ mario@181: /*| incompl_located_var_decl_list incompl_located_var_decl ';' */ mario@181: SYM_LIST(incompl_located_var_decl_list_c) mario@181: mario@181: /* variable_name incompl_location ':' var_spec */ mario@181: SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused) mario@181: mario@181: /* AT incompl_location_token */ mario@181: SYM_TOKEN(incompl_location_c) mario@181: #endif mario@181: mario@181: mario@181: void *visit(var1_init_decl_c *symbol); mario@181: void *visit(var1_list_c *symbol); mario@181: void *visit(var_init_decl_list_c *symbol); mario@181: mario@181: mario@181: /***********************/ mario@181: /* B 1.5.1 - Functions */ mario@181: /***********************/ mario@181: void *visit(function_declaration_c *symbol); mario@181: /* intermediate helper symbol for function_declaration */ mario@181: void *visit(var_declarations_list_c *symbol); mario@181: void *visit(function_var_decls_c *symbol); mario@181: mario@181: mario@181: /*****************************/ mario@181: /* B 1.5.2 - Function Blocks */ mario@181: /*****************************/ mario@181: /* FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */ mario@181: void *visit(function_block_declaration_c *symbol); mario@181: mario@181: /* intermediate helper symbol for function_declaration */ mario@181: /* { io_var_declarations | other_var_declarations } */ mario@181: /* mario@181: * NOTE: we re-use the var_declarations_list_c mario@181: */ mario@181: mario@181: /* VAR_TEMP temp_var_decl_list END_VAR */ mario@181: void *visit(temp_var_decls_c *symbol); mario@181: void *visit(temp_var_decls_list_c *symbol); mario@181: mario@181: /* VAR NON_RETAIN var_init_decl_list END_VAR */ mario@181: void *visit(non_retentive_var_decls_c *symbol); mario@181: mario@181: mario@181: /**********************/ mario@181: /* B 1.5.3 - Programs */ mario@181: /**********************/ mario@181: /* PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */ mario@181: // SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused) mario@181: void *visit(program_declaration_c *symbol); mario@181: mario@181: /* intermediate helper symbol for program_declaration_c */ mario@181: /* { io_var_declarations | other_var_declarations } */ mario@181: /* mario@181: * NOTE: we re-use the var_declarations_list_c mario@181: */ mario@181: mario@181: }; // function_param_iterator_c mario@181: mario@181: mario@181: mario@181: mario@181: mario@181: mario@181: