mario@181: /*
mario@181:  * (c) 2003 Mario de Sousa
mario@181:  *
mario@181:  * Offered to the public under the terms of the GNU General Public License
mario@181:  * as published by the Free Software Foundation; either version 2 of the
mario@181:  * License, or (at your option) any later version.
mario@181:  *
mario@181:  * This program is distributed in the hope that it will be useful, but
mario@181:  * WITHOUT ANY WARRANTY; without even the implied warranty of
mario@181:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
mario@181:  * Public License for more details.
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: /*
mario@181:  * An IEC 61131-3 IL and ST 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:
mario@181:       /* a pointer to the function_block_declaration_c
mario@181:        * or function_declaration_c currently being analysed.
mario@181:        */
mario@181:     symbol_c *f_decl;
mario@181:     int next_param, param_count;
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;
mario@181:     bool en_declared;
mario@181:     bool eno_declared;
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.
mario@181:      * We must be given a reference to the function declaration
mario@181:      * that will be analysed...
mario@181:      */
mario@181:     function_param_iterator_c(function_declaration_c *f_decl);
mario@181: 
mario@181:     /* initialise the iterator object.
mario@181:      * We must be given a reference to the function block declaration
mario@181:      * that will be analysed...
mario@181:      */
mario@181:     function_param_iterator_c(function_block_declaration_c *fb_decl);
mario@181: 
mario@181:     /* initialise the iterator object.
mario@181:      * We must be given a reference to the program declaration
mario@181:      * that will be analysed...
mario@181:      */
mario@181:     function_param_iterator_c(program_declaration_c *p_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: 
mario@181:     identifier_c *declare_en_param(void);
mario@181: 
mario@181:     identifier_c *declare_eno_param(void);
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: 
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:
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: