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:  * Function call parameter iterator.
ccb@202:  * It will iterate through the non-formal parameters of a function call
mario@181:  * (i.e. function calls using the foo(<param1>, <param2>, ...) syntax).
ccb@202:  * and/or search through the formal parameters of a function call
mario@181:  * (i.e. function calls using the foo(<name1> = <param1>, <name2> = <param2>, ...) syntax).
mario@181:  *
mario@181:  * Calls to function blocks and programs are also supported.
mario@181:  *
ccb@202:  * Note that calls to next_nf() will only iterate through non-formal parameters,
ccb@202:  * calls to next_f() will only iterate through formal parameters,
ccb@202:  * and calls to search_f() will only serach through formal parameters.
mario@181:  */
mario@181: 
mario@181: 
mario@181: #include "../absyntax/visitor.hh"
mario@181: 
mario@181: 
mario@181: class function_call_param_iterator_c : public null_visitor_c {
mario@181: 
mario@181:   private:
mario@181:       /* a pointer to the function call
mario@181:        * (or function block or program call!)
mario@181:        */
mario@181:     symbol_c *f_call;
ccb@202:     int iterate_f_next_param, iterate_nf_next_param, param_count;
mario@181:     identifier_c *search_param_name;
ccb@202:     symbol_c *current_value;
ccb@202: 
ccb@202:     /* Which operation of the class was called:
ccb@202:      *  - iterate to the next non-formal parameter. 
ccb@202:      *  - iterate to the next formal parameter. 
ccb@202:      *  - search a formal parameter, 
mario@181:      */
ccb@202:     typedef enum {iterate_nf_op, iterate_f_op, search_f_op} operation_t;
mario@181:     operation_t current_operation;
mario@181: 
mario@181:   private:
mario@181:     void *search_list(list_c *list);
mario@181:     void *handle_parameter_assignment(symbol_c *variable_name, symbol_c *expression) ;
mario@181: 
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/program/function block call
mario@181:      * that will be analysed...
mario@181:      */
mario@181:     function_call_param_iterator_c(symbol_c *f_call);
mario@181: 
ccb@202:     /* Skip to the next formal parameter. After object creation,
ccb@202:      * the object references on parameter _before_ the first, so
ccb@202:      * this function must be called once to get the object to
ccb@202:      * reference the first parameter...
ccb@202:      *
ccb@202:      * Returns the paramater name to which a value is being passed!
ccb@202:      * You can determine the value being passed by calling 
ccb@202:      * function_call_param_iterator_c::search_f()
ccb@202:      */
ccb@202:     symbol_c *next_f(void);
ccb@202: 
ccb@202:     /* Skip to the next non-formal 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 whatever is being passed to the parameter!
mario@181:      */
ccb@202:     symbol_c *next_nf(void);
mario@181: 
mario@181:     /* Search for the value passed to the parameter named <param_name>...  */
ccb@202:     symbol_c *search_f(symbol_c *param_name);
ccb@202: 
ccb@202:     /* Returns the value being passed to the current parameter. */
ccb@202:     symbol_c *get_current_value(void);
mario@181: 
mario@181: 
mario@181:   private:
mario@181:   /********************************/
mario@181:   /* B 1.7 Configuration elements */
mario@181:   /********************************/
mario@181:  
mario@181:   /*
mario@181:   CONFIGURATION configuration_name
mario@181:      optional_global_var_declarations
mario@181:    (resource_declaration_list | single_resource_declaration)
mario@181:    optional_access_declarations
mario@181:    optional_instance_specific_initializations
mario@181:   END_CONFIGURATION
mario@181:   */
mario@181:   /*
mario@181:   SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
mario@181:   */
mario@181: 
mario@181:   /* helper symbol for configuration_declaration */
mario@181:   /*
mario@181:   SYM_LIST(resource_declaration_list_c)
mario@181:   */
mario@181: 
mario@181:   /*
mario@181:   RESOURCE resource_name ON resource_type_name
mario@181:      optional_global_var_declarations
mario@181:    single_resource_declaration
mario@181:   END_RESOURCE
mario@181:   */
mario@181:   /*
mario@181:   SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
mario@181:   */
mario@181: 
mario@181:   /* task_configuration_list program_configuration_list */
mario@181:   /*
mario@181:   SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
mario@181:   */
mario@181: 
mario@181:   /* helper symbol for single_resource_declaration */
mario@181:   /*
mario@181:   SYM_LIST(task_configuration_list_c)
mario@181:   */
mario@181: 
mario@181:   /* helper symbol for single_resource_declaration */
mario@181:   /*
mario@181:   SYM_LIST(program_configuration_list_c)
mario@181:   */
mario@181: 
mario@181:   /* helper symbol for
mario@181:    *  - access_path
mario@181:    *  - instance_specific_init
mario@181:    */
mario@181:   /*
mario@181:   SYM_LIST(any_fb_name_list_c)
mario@181:   */
mario@181: 
mario@181:   /*  [resource_name '.'] global_var_name ['.' structure_element_name] */
mario@181:   /*
mario@181:   SYM_REF4(global_var_reference_c, resource_name, global_var_name, structure_element_name, unused)
mario@181:   */
mario@181: 
mario@181:   /*  prev_declared_program_name '.' symbolic_variable */
mario@181:   /*
mario@181:   SYM_REF2(program_output_reference_c, program_name, symbolic_variable)
mario@181:   */
mario@181:  
mario@181:   /*  TASK task_name task_initialization */
mario@181:   /*
mario@181:   SYM_REF2(task_configuration_c, task_name, task_initialization)
mario@181:   */
mario@181: 
mario@181:   /*  '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */
mario@181:   /*
mario@181:   SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused)
mario@181:   */
mario@181: 
mario@181:   /*  PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */
mario@181:   // SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused)
mario@181:     void *visit(program_configuration_c *symbol);
mario@181: 
mario@181:   /* prog_conf_elements ',' prog_conf_element */
mario@181:   // SYM_LIST(prog_conf_elements_c)
mario@181:     void *visit(prog_conf_elements_c *symbol);
mario@181: 
mario@181:   /*  fb_name WITH task_name */
mario@181:   /*
mario@181:   SYM_REF2(fb_task_c, fb_name, task_name)
mario@181:   */
mario@181: 
mario@181:   /*  any_symbolic_variable ASSIGN prog_data_source */
mario@181:   // SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)
mario@181:     void *visit(prog_cnxn_assign_c *symbol);
mario@181: 
mario@181:   /* any_symbolic_variable SENDTO data_sink */
mario@181:   // SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source)
mario@181:     void *visit(prog_cnxn_sendto_c *symbol);
mario@181: 
mario@181:   /* VAR_CONFIG instance_specific_init_list END_VAR */
mario@181:   /*
mario@181:   SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused)
mario@181:   */
mario@181: 
mario@181:   /* helper symbol for instance_specific_initializations */
mario@181:   /*
mario@181:   SYM_LIST(instance_specific_init_list_c)
mario@181:   */
mario@181: 
mario@181:   /* resource_name '.' program_name '.' {fb_name '.'}
mario@181:       ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))
mario@181:   */
mario@181:   /*
mario@181:   SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)
mario@181:   */
mario@181: 
mario@181:   /* helper symbol for instance_specific_init */
mario@181:   /* function_block_type_name ':=' structure_initialization */
mario@181:   /*
mario@181:   SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)
mario@181:   */
mario@181: 
mario@181: 
mario@181:   /****************************************/
mario@181:   /* B.2 - Language IL (Instruction List) */
mario@181:   /****************************************/
mario@181:   /***********************************/
mario@181:   /* B 2.1 Instructions and Operands */
mario@181:   /***********************************/
mario@181: 
mario@181:   /* | function_name [il_operand_list] */
mario@181:   // SYM_REF2(il_function_call_c, function_name, il_operand_list)
mario@181:     void *visit(il_function_call_c *symbol);
mario@181: 
mario@181: 
mario@181:   /* | function_name '(' eol_list [il_param_list] ')' */
mario@181:   // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
mario@181:     void *visit(il_formal_funct_call_c *symbol);
mario@181: 
mario@181: 
mario@181:   /*   il_call_operator prev_declared_fb_name
mario@181:    * | il_call_operator prev_declared_fb_name '(' ')'
mario@181:    * | il_call_operator prev_declared_fb_name '(' eol_list ')'
mario@181:    * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
mario@181:    * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
mario@181:    */
mario@181:   // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)
mario@181:     void *visit(il_fb_call_c *symbol);
mario@181: 
mario@181: 
mario@181: 
mario@181:   /* | il_operand_list ',' il_operand */
mario@181:   // SYM_LIST(il_operand_list_c)
mario@181:     void *visit(il_operand_list_c *symbol);
mario@181: 
mario@181: 
mario@181:   /* | il_initial_param_list il_param_instruction */
mario@181:   // SYM_LIST(il_param_list_c)
mario@181:     void *visit(il_param_list_c *symbol);
mario@181: 
mario@181:   /*  il_assign_operator il_operand
mario@181:    * | il_assign_operator '(' eol_list simple_instr_list ')'
mario@181:    */
mario@181:   // SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused)
mario@181:     void *visit(il_param_assignment_c *symbol);
mario@181: 
mario@181:   /*  il_assign_out_operator variable */
mario@181:   // SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable);
mario@181:     void *visit(il_param_out_assignment_c *symbol);
mario@181: 
mario@181: 
mario@181:   /*******************/
mario@181:   /* B 2.2 Operators */
mario@181:   /*******************/
ccb@202:   /*  any_identifier ASSIGN */
ccb@202:   // SYM_REF1(il_assign_operator_c, variable_name)
ccb@202:     void *visit(il_assign_operator_c *symbol);
ccb@202: 
mario@181:   /*| [NOT] any_identifier SENDTO */
mario@181:   // SYM_REF2(il_assign_out_operator_c, option, variable_name)
mario@181:     void *visit(il_assign_out_operator_c *symbol);
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181:   /***************************************/
mario@181:   /* B.3 - Language ST (Structured Text) */
mario@181:   /***************************************/
mario@181:   /***********************/
mario@181:   /* B 3.1 - Expressions */
mario@181:   /***********************/
mario@181: 
mario@181:   /*
mario@181:   SYM_REF2(function_invocation_c, function_name, parameter_assignment_list)
mario@181:   */
mario@181:     void *visit(function_invocation_c *symbol);
mario@181: 
mario@181: 
mario@181:   /********************/
mario@181:   /* B 3.2 Statements */
mario@181:   /********************/
mario@181: 
mario@181:   /*********************************/
mario@181:   /* B 3.2.1 Assignment Statements */
mario@181:   /*********************************/
mario@181:   /*
mario@181:   SYM_REF2(assignment_statement_c, l_exp, r_exp)
mario@181:   */
mario@181: 
mario@181:   /*****************************************/
mario@181:   /* B 3.2.2 Subprogram Control Statements */
mario@181:   /*****************************************/
mario@181:   /*  RETURN */
mario@181:   // SYM_REF0(return_statement_c)
mario@181: 
mario@181: 
mario@181:   /* fb_name '(' [param_assignment_list] ')' */
mario@181:   /* param_assignment_list -> may be NULL ! */
mario@181:   // SYM_REF2(fb_invocation_c, fb_name, param_assignment_list)
mario@181:     void *visit(fb_invocation_c *symbol);
mario@181: 
mario@181:   /* helper symbol for fb_invocation */
mario@181:   /* param_assignment_list ',' param_assignment */
mario@181:   // SYM_LIST(param_assignment_list_c)
mario@181:     void *visit(param_assignment_list_c *symbol);
mario@181: 
mario@181:   /*  variable_name ASSIGN expression */
mario@181:   // SYM_REF2(input_variable_param_assignment_c, variable_name, expression)
mario@181:     void *visit(input_variable_param_assignment_c *symbol);
mario@181: 
mario@181:   /* [NOT] variable_name '=>' variable */
mario@181:   // SYM_REF4(output_variable_param_assignment_c, not_param, variable_name, variable, unused)
mario@181:     void *visit(output_variable_param_assignment_c *symbol);
mario@181: 
mario@181:   /* helper CLASS for output_variable_param_assignment */
mario@181:   // SYM_REF0(not_paramassign_c)
mario@181:   // TODO... ???
mario@181: 
mario@181: };  // function_call_param_iterator_c
mario@181: 
mario@181: 
mario@181: 
mario@181: