absyntax_utils/function_call_param_iterator.hh
author Mario de Sousa <msousa@fe.up.pt>
Wed, 08 Feb 2012 18:27:45 +0000
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * An IEC 61131-3 compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 */
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/*
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 * Function call parameter iterator.
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 * It will iterate through the non-formal parameters of a function call
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 * (i.e. function calls using the foo(<param1>, <param2>, ...) syntax).
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 * and/or search through the formal parameters of a function call
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 * (i.e. function calls using the foo(<name1> = <param1>, <name2> = <param2>, ...) syntax).
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 *
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 * Calls to function blocks and programs are also supported.
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 *
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 * Note that calls to next_nf() will only iterate through non-formal parameters,
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 * calls to next_f() will only iterate through formal parameters,
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 * and calls to search_f() will only serach through formal parameters.
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 */
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#include "../absyntax/visitor.hh"
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class function_call_param_iterator_c : public null_visitor_c {
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  private:
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      /* a pointer to the function call
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       * (or function block or program call!)
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       */
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    symbol_c *f_call;
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    int iterate_f_next_param, iterate_nf_next_param, param_count;
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    identifier_c *search_param_name;
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    symbol_c *current_value;
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    /* Which operation of the class was called:
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     *  - iterate to the next non-formal parameter. 
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     *  - iterate to the next formal parameter. 
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     *  - search a formal parameter, 
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     */
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    typedef enum {iterate_nf_op, iterate_f_op, search_f_op} operation_t;
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    operation_t current_operation;
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  private:
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    void *search_list(list_c *list);
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    void *handle_parameter_assignment(symbol_c *variable_name, symbol_c *expression) ;
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  public:
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    /* start off at the first parameter once again... */
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    void reset(void);
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    /* initialise the iterator object.
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     * We must be given a reference to the function/program/function block call
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     * that will be analysed...
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     */
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    function_call_param_iterator_c(symbol_c *f_call);
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    /* Skip to the next formal parameter. After object creation,
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     * the object references on parameter _before_ the first, so
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     * this function must be called once to get the object to
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     * reference the first parameter...
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     *
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     * Returns the paramater name to which a value is being passed!
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     * You can determine the value being passed by calling 
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     * function_call_param_iterator_c::search_f()
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     */
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    symbol_c *next_f(void);
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    /* Skip to the next non-formal parameter. After object creation,
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     * the object references on parameter _before_ the first, so
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     * this function must be called once to get the object to
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     * reference the first parameter...
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     *
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     * Returns whatever is being passed to the parameter!
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     */
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    symbol_c *next_nf(void);
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    /* Search for the value passed to the parameter named <param_name>...  */
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    symbol_c *search_f(symbol_c *param_name);
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    symbol_c *search_f(const char *param_name);
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    /* Returns the value being passed to the current parameter. */
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    symbol_c *get_current_value(void);
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  private:
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  /********************************/
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  /* B 1.7 Configuration elements */
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  /********************************/
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  /*
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  CONFIGURATION configuration_name
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     optional_global_var_declarations
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   (resource_declaration_list | single_resource_declaration)
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   optional_access_declarations
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   optional_instance_specific_initializations
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  END_CONFIGURATION
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  */
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  /*
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  SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
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  */
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  /* helper symbol for configuration_declaration */
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  /*
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  SYM_LIST(resource_declaration_list_c)
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  */
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  /*
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  RESOURCE resource_name ON resource_type_name
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     optional_global_var_declarations
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   single_resource_declaration
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  END_RESOURCE
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  */
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  /*
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  SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
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  */
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  /* task_configuration_list program_configuration_list */
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  /*
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  SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
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  */
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  /* helper symbol for single_resource_declaration */
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  /*
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  SYM_LIST(task_configuration_list_c)
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  */
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  /* helper symbol for single_resource_declaration */
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  /*
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  SYM_LIST(program_configuration_list_c)
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  */
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  /* helper symbol for
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   *  - access_path
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   *  - instance_specific_init
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   */
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  /*
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  SYM_LIST(any_fb_name_list_c)
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  */
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  /*  [resource_name '.'] global_var_name ['.' structure_element_name] */
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  /*
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  SYM_REF4(global_var_reference_c, resource_name, global_var_name, structure_element_name, unused)
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  */
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  /*  prev_declared_program_name '.' symbolic_variable */
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  /*
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  SYM_REF2(program_output_reference_c, program_name, symbolic_variable)
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  */
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  /*  TASK task_name task_initialization */
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  /*
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  SYM_REF2(task_configuration_c, task_name, task_initialization)
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  */
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  /*  '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */
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  /*
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  SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused)
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  */
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  /*  PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */
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  // SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused)
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    void *visit(program_configuration_c *symbol);
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  /* prog_conf_elements ',' prog_conf_element */
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  // SYM_LIST(prog_conf_elements_c)
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    void *visit(prog_conf_elements_c *symbol);
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  /*  fb_name WITH task_name */
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  /*
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  SYM_REF2(fb_task_c, fb_name, task_name)
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  */
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  /*  any_symbolic_variable ASSIGN prog_data_source */
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  // SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)
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    void *visit(prog_cnxn_assign_c *symbol);
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  /* any_symbolic_variable SENDTO data_sink */
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  // SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source)
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    void *visit(prog_cnxn_sendto_c *symbol);
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  /* VAR_CONFIG instance_specific_init_list END_VAR */
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  /*
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  SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused)
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  */
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  /* helper symbol for instance_specific_initializations */
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  /*
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  SYM_LIST(instance_specific_init_list_c)
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  */
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  /* resource_name '.' program_name '.' {fb_name '.'}
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      ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))
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  */
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  /*
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  SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)
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  */
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  /* helper symbol for instance_specific_init */
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  /* function_block_type_name ':=' structure_initialization */
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  /*
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  SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)
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  */
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  /****************************************/
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  /* B.2 - Language IL (Instruction List) */
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  /****************************************/
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  /***********************************/
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  /* B 2.1 Instructions and Operands */
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  /***********************************/
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  /* | function_name [il_operand_list] */
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  // SYM_REF2(il_function_call_c, function_name, il_operand_list)
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    void *visit(il_function_call_c *symbol);
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  /* | function_name '(' eol_list [il_param_list] ')' */
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  // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
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    void *visit(il_formal_funct_call_c *symbol);
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  /*   il_call_operator prev_declared_fb_name
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   * | il_call_operator prev_declared_fb_name '(' ')'
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   * | il_call_operator prev_declared_fb_name '(' eol_list ')'
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   * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
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   * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
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   */
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  // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)
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    void *visit(il_fb_call_c *symbol);
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  /* | il_operand_list ',' il_operand */
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  // SYM_LIST(il_operand_list_c)
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    void *visit(il_operand_list_c *symbol);
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  /* | il_initial_param_list il_param_instruction */
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  // SYM_LIST(il_param_list_c)
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    void *visit(il_param_list_c *symbol);
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  /*  il_assign_operator il_operand
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   * | il_assign_operator '(' eol_list simple_instr_list ')'
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   */
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  // SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused)
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    void *visit(il_param_assignment_c *symbol);
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  /*  il_assign_out_operator variable */
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  // SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable);
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    void *visit(il_param_out_assignment_c *symbol);
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  /*******************/
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  /* B 2.2 Operators */
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  /*******************/
202
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  /*  any_identifier ASSIGN */
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  // SYM_REF1(il_assign_operator_c, variable_name)
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    void *visit(il_assign_operator_c *symbol);
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181
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  /*| [NOT] any_identifier SENDTO */
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  // SYM_REF2(il_assign_out_operator_c, option, variable_name)
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    void *visit(il_assign_out_operator_c *symbol);
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  /***************************************/
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  /* B.3 - Language ST (Structured Text) */
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  /***************************************/
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  /***********************/
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  /* B 3.1 - Expressions */
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  /***********************/
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  /*
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  SYM_REF2(function_invocation_c, function_name, parameter_assignment_list)
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  */
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    void *visit(function_invocation_c *symbol);
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  /********************/
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  /* B 3.2 Statements */
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  /********************/
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  /*********************************/
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  /* B 3.2.1 Assignment Statements */
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  /*********************************/
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  /*
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  SYM_REF2(assignment_statement_c, l_exp, r_exp)
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  */
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  /*****************************************/
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  /* B 3.2.2 Subprogram Control Statements */
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  /*****************************************/
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  /*  RETURN */
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  // SYM_REF0(return_statement_c)
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  /* fb_name '(' [param_assignment_list] ')' */
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  /* param_assignment_list -> may be NULL ! */
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  // SYM_REF2(fb_invocation_c, fb_name, param_assignment_list)
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    void *visit(fb_invocation_c *symbol);
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  /* helper symbol for fb_invocation */
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  /* param_assignment_list ',' param_assignment */
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  // SYM_LIST(param_assignment_list_c)
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    void *visit(param_assignment_list_c *symbol);
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  /*  variable_name ASSIGN expression */
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  // SYM_REF2(input_variable_param_assignment_c, variable_name, expression)
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    void *visit(input_variable_param_assignment_c *symbol);
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  /* [NOT] variable_name '=>' variable */
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  // SYM_REF4(output_variable_param_assignment_c, not_param, variable_name, variable, unused)
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    void *visit(output_variable_param_assignment_c *symbol);
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  /* helper CLASS for output_variable_param_assignment */
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  // SYM_REF0(not_paramassign_c)
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  // TODO... ???
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};  // function_call_param_iterator_c
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