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)
Edouard@279:  *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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 <http://www.gnu.org/licenses/>.
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:  * 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: 
mario@181: #include "function_call_param_iterator.hh"
mario@181: #include <strings.h>
mario@181: 
mario@181: 
mario@181: //#define DEBUG
mario@181: #ifdef DEBUG
mario@181: #define TRACE(classname) printf("\n____%s____\n",classname);
mario@181: #else
mario@181: #define TRACE(classname)
mario@181: #endif
mario@181: 
mario@181: #define ERROR error_exit(__FILE__,__LINE__)
mario@181: /* function defined in main.cc */
mario@181: extern void error_exit(const char *file_name, int line_no);
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: 
mario@181: void *function_call_param_iterator_c::search_list(list_c *list) {
mario@181:   switch (current_operation) {
ccb@202:     case iterate_nf_op:
mario@181:       for(int i = 0; i < list->n; i++) {
mario@181:         void *res = list->elements[i]->accept(*this);
mario@181:         if (NULL != res) {
mario@181:           /* It went through the handle_parameter_assignment() function,
mario@181:            * and is therefore a parameter assignment (<param> = <value>),
mario@181:            * and not a simple expression (<value>).
mario@181:            */
mario@181:           /* we do nothing... */
mario@181:         } else {
mario@181:           param_count++;
ccb@202:           if (param_count == iterate_nf_next_param) {
mario@181:             return list->elements[i];
mario@181:           }
mario@181:         }
mario@181:       }
mario@181:       return NULL;
mario@181:       break;
mario@181: 
ccb@202:     case iterate_f_op:
ccb@202:       for(int i = 0; i < list->n; i++) {
ccb@202:         void *res = list->elements[i]->accept(*this);
ccb@202:         if (NULL != res) {
ccb@202:           /* It went through the handle_parameter_assignment() function,
ccb@202:            * and is therefore a parameter assignment (<param> = <value>),
ccb@202:            * and not a simple expression (<value>).
ccb@202:            */
ccb@202:           param_count++;
ccb@202:           if (param_count == iterate_f_next_param) {
ccb@202:             return res;
ccb@202:           }
ccb@202:         } else {
ccb@202:           /* we do nothing... */
ccb@202:         }
ccb@202:       }
ccb@202:       return NULL;
ccb@202:       break;
ccb@202: 
ccb@202:     case search_f_op:
mario@181:       for(int i = 0; i < list->n; i++) {
mario@181:         void *res = list->elements[i]->accept(*this);
mario@181:         if (res != NULL)
mario@181:           return res;
mario@181:       }
mario@181:       return NULL;
mario@181:       break;
mario@181:   } /* switch */
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: 
mario@181: 
mario@181: void *function_call_param_iterator_c::handle_parameter_assignment(symbol_c *variable_name, symbol_c *expression) {
mario@181:   switch (current_operation) {
ccb@202:     case iterate_nf_op:
mario@181:           /* UGLY HACK -> this will be detected in the search_list() function */
ccb@202:       return (void *)variable_name; /* anything, as long as it is not NULL!! */
mario@181:       break;
mario@181: 
ccb@202:     case iterate_f_op:
ccb@202:       current_value = expression;
ccb@202:       return (void *)variable_name;
ccb@202:       break;
ccb@202: 
ccb@202:     case search_f_op:
mario@181:       identifier_c *variable_name2 = dynamic_cast<identifier_c *>(variable_name);
ccb@202: 
mario@181:       if (variable_name2 == NULL) ERROR;
ccb@202: 
mario@181:       if (strcasecmp(search_param_name->value, variable_name2->value) == 0)
mario@181:         /* FOUND! This is the same parameter!! */
mario@181:         return (void *)expression;
mario@181:       return NULL;
mario@181:       break;
mario@181:   }
mario@181: 
mario@181:   ERROR;
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: 
mario@181: /* start off at the first parameter once again... */
mario@181: void function_call_param_iterator_c::reset(void) {
ccb@202:   iterate_nf_next_param = 0;
ccb@202:   iterate_f_next_param  = 0;
ccb@202:   param_count = 0;
mario@181: }
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::function_call_param_iterator_c(symbol_c *f_call) {
mario@181:   /* It is expected that f_call will reference one of the following:
mario@181:    *  program_configuration_c
mario@181:    *  function_invocation_c
mario@181:    *  fb_invocation_c
mario@181:    *  il_function_call_c
mario@181:    *  il_formal_funct_call_c
mario@181:    *  ... (have I missed any?)
mario@181:    */
mario@181:   this->f_call = f_call;
mario@181:   search_param_name = NULL;
mario@181:   reset();
mario@181: }
mario@181: 
ccb@202: /* Skip to the next 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:  *
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 *function_call_param_iterator_c::next_f(void) {
ccb@202:   current_value = NULL;
msousa@449:   current_assign_direction = assign_none;
mario@181:   param_count = 0;
ccb@202:   iterate_f_next_param++;
ccb@202:   current_operation = function_call_param_iterator_c::iterate_f_op;
mario@181:   void *res = f_call->accept(*this);
mario@181:   return (symbol_c *)res;
mario@181: }
mario@181: 
ccb@202: 
ccb@202: /* Skip to the next non-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 whatever is being passed to the parameter!
ccb@202:  */
ccb@202: symbol_c *function_call_param_iterator_c::next_nf(void) {
ccb@202:   current_value = NULL;
msousa@449:   current_assign_direction = assign_none;
ccb@202:   param_count = 0;
ccb@202:   iterate_nf_next_param++;
ccb@202:   current_operation = function_call_param_iterator_c::iterate_nf_op;
ccb@202:   void *res = f_call->accept(*this);
ccb@202:   current_value = (symbol_c *)res;
ccb@202:   return (symbol_c *)res;
ccb@202: }
ccb@202: 
mario@181: /* Search for the value passed to the parameter named <param_name>...  */
ccb@202: symbol_c *function_call_param_iterator_c::search_f(symbol_c *param_name) {
ccb@202:   current_value = NULL;
msousa@449:   current_assign_direction = assign_none;
mario@181:   if (NULL == param_name) ERROR;
mario@181:   search_param_name = dynamic_cast<identifier_c *>(param_name);
mario@181:   if (NULL == search_param_name) ERROR;
ccb@202:   current_operation = function_call_param_iterator_c::search_f_op;
mario@181:   void *res = f_call->accept(*this);
ccb@202:   current_value = (symbol_c *)res;
mario@181:   return (symbol_c *)res;
mario@181: }
mario@181: 
msousa@350: /* Search for the value passed to the parameter named <param_name>...  */
msousa@350: symbol_c *function_call_param_iterator_c::search_f(const char *param_name) {
msousa@350:   identifier_c tmp_indentifier(param_name);
msousa@350:   return search_f(&tmp_indentifier);
msousa@350: }
msousa@350: 
msousa@350: 
ccb@202: /* Returns the value being passed to the current parameter. */
ccb@202: symbol_c *function_call_param_iterator_c::get_current_value(void) {
ccb@202:   return current_value;
ccb@202: }
mario@181: 
msousa@449: /* Returns the value being passed to the current parameter. */
msousa@449: function_call_param_iterator_c::assign_direction_t function_call_param_iterator_c::get_assign_direction(void) {
msousa@449:   return current_assign_direction;
msousa@449: }
msousa@449: 
msousa@449: 
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 *function_call_param_iterator_c::visit(program_configuration_c *symbol) {
mario@181:   TRACE("program_configuration_c");
mario@181:   return symbol->prog_conf_elements->accept(*this);
mario@181: }
mario@181: 
mario@181: /* prog_conf_elements ',' prog_conf_element */
mario@181: // SYM_LIST(prog_conf_elements_c)
mario@181: void *function_call_param_iterator_c::visit(prog_conf_elements_c *symbol) {
mario@181:   TRACE("prog_conf_elements_c");
mario@181:   return search_list(symbol);
mario@181: }
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 *function_call_param_iterator_c::visit(prog_cnxn_assign_c *symbol) {
mario@181:   TRACE("prog_cnxn_assign_c");
mario@181: 
mario@181:   /* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)
mario@181:    *       do not understand the semantics that should be implmeneted if it is not a
mario@181:    *        symbolic_variable, so for the moment we simply give up!
mario@181:    */
mario@181:   symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);
mario@181:   if (NULL == symb_var)
mario@181:     ERROR;
mario@181: 
msousa@449:   current_assign_direction = assign_in;
mario@181:   return handle_parameter_assignment(symb_var->var_name, symbol->prog_data_source);
mario@181: }
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 *function_call_param_iterator_c::visit(prog_cnxn_sendto_c *symbol) {
mario@181:   TRACE("prog_cnxn_sendto_c");
mario@181: 
mario@181:   /* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)
mario@181:    *       do not understand the semantics that should be implmeneted if it is not a
mario@181:    *        symbolic_variable, so for the moment we simply give up!
mario@181:    */
mario@181:   symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);
mario@181:   if (NULL == symb_var)
mario@181:     ERROR;
mario@181: 
msousa@449:   current_assign_direction = assign_out;
mario@181:   return handle_parameter_assignment(symb_var->var_name, symbol->data_sink);
mario@181: }
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: /****************************************/
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 *function_call_param_iterator_c::visit(il_function_call_c *symbol) {
mario@181:   TRACE("il_function_call_c");
mario@181:   if (NULL != symbol->il_operand_list)
mario@181:     return symbol->il_operand_list->accept(*this);
mario@181:   return NULL;
mario@181: }
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 *function_call_param_iterator_c::visit(il_formal_funct_call_c *symbol) {
mario@181:   TRACE("il_formal_funct_call_c");
mario@181:   if (NULL != symbol->il_param_list)
mario@181:     return symbol->il_param_list->accept(*this);
mario@181:   return NULL;
mario@181: }
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 *function_call_param_iterator_c::visit(il_fb_call_c *symbol) {
mario@181:   TRACE("il_fb_call_c");
mario@181:   /* the following should never occur. In reality the syntax parser
mario@181:    * will guarantee that they never occur, but it makes it easier to
mario@181:    * understand the remaining code :-)
mario@181:    */
mario@181:   //if ((NULL == symbol->il_operand_list) && (NULL == symbol->il_param_list)) ERROR;
mario@181:   //if ((NULL != symbol->il_operand_list) && (NULL != symbol->il_param_list)) ERROR;
mario@181: 
mario@181:   if (NULL != symbol->il_operand_list)
mario@181:     return symbol->il_operand_list->accept(*this);
mario@181:   if (NULL != symbol->il_param_list)
mario@181:     return symbol->il_param_list->accept(*this);
mario@181:   return NULL;
mario@181: }
mario@181: 
mario@181: /* | il_operand_list ',' il_operand */
mario@181: // SYM_LIST(il_operand_list_c)
mario@181: void *function_call_param_iterator_c::visit(il_operand_list_c *symbol) {
mario@181:   TRACE("il_operand_list_c");
mario@181:   return search_list(symbol);
mario@181: }
mario@181: 
mario@181: 
mario@181: /* | il_initial_param_list il_param_instruction */
mario@181: // SYM_LIST(il_param_list_c)
mario@181: void *function_call_param_iterator_c::visit(il_param_list_c *symbol) {
mario@181:   TRACE("il_param_list_c");
mario@181:   return search_list(symbol);
mario@181: }
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 *function_call_param_iterator_c::visit(il_param_assignment_c *symbol) {
mario@181:   TRACE("il_param_assignment_c");
mario@181: 
mario@181:   // TODO : We do not yet handle a instruction list passed as parameter !!!
mario@181:   // since we do not yet support it, it is best to simply stop than to fail silently...
mario@181:   if (NULL != symbol->simple_instr_list) ERROR;
mario@181: 
msousa@449:   current_assign_direction = assign_in;
ccb@202:   return handle_parameter_assignment((symbol_c *)symbol->il_assign_operator->accept(*this), symbol->il_operand);
mario@181: }
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 *function_call_param_iterator_c::visit(il_param_out_assignment_c *symbol) {
mario@181:   TRACE("il_param_out_assignment_c");
msousa@449:   current_assign_direction = assign_out;
mario@181:   return handle_parameter_assignment((symbol_c *)symbol->il_assign_out_operator->accept(*this), symbol->variable);
mario@181: }
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 *function_call_param_iterator_c::visit(il_assign_operator_c *symbol) {
ccb@202:   TRACE("il_assign_operator_c");
ccb@202:   return (void *)symbol->variable_name;
ccb@202: }
ccb@202: 
mario@181: /*| [NOT] any_identifier SENDTO */
mario@181: // SYM_REF2(il_assign_out_operator_c, option, variable_name)
mario@181: void *function_call_param_iterator_c::visit(il_assign_out_operator_c *symbol) {
mario@181:   TRACE("il_assign_out_operator_c");
mario@181: 
mario@181:   // TODO : Handle not_param !!!
mario@181:   // we do not yet support it, so it is best to simply stop than to fail silently...
ccb@202:   // if (NULL != symbol->option) ERROR;
mario@181: 
mario@181:   return (void *)symbol->variable_name;
mario@181: }
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 *function_call_param_iterator_c::visit(function_invocation_c *symbol) {
mario@181:   TRACE("function_invocation_c");
ccb@202:   /* If the syntax parser is working correctly, exactly one of the 
ccb@202:    * following two symbols will be NULL, while the other is != NULL.
ccb@202:    */
laurent@247:   if (symbol == (function_invocation_c *)f_call) {
laurent@247: 	if (symbol->   formal_param_list != NULL) return symbol->   formal_param_list->accept(*this);
laurent@247:     if (symbol->nonformal_param_list != NULL) return symbol->nonformal_param_list->accept(*this);
laurent@247:   }
ccb@202: 
ccb@202:   return NULL;
mario@181: }
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 *function_call_param_iterator_c::visit(fb_invocation_c *symbol) {
mario@181:   TRACE("fb_invocation_c");
ccb@202:   /* If the syntax parser is working correctly, only one of the 
ccb@202:    * following two symbols will be != NULL.
ccb@202:    * However, both may be NULL simultaneously!
ccb@202:    */
ccb@202:   if (symbol->   formal_param_list != NULL) return symbol->   formal_param_list->accept(*this);
ccb@202:   if (symbol->nonformal_param_list != NULL) return symbol->nonformal_param_list->accept(*this);
ccb@202: 
ccb@202:   return NULL;
mario@181: }
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 *function_call_param_iterator_c::visit(param_assignment_list_c *symbol) {
mario@181:   TRACE("param_assignment_list_c");
mario@181:   return search_list(symbol);
mario@181: }
mario@181: 
mario@181: /*  variable_name ASSIGN expression */
mario@181: // SYM_REF2(input_variable_param_assignment_c, variable_name, expression)
mario@181: void *function_call_param_iterator_c::visit(input_variable_param_assignment_c *symbol) {
mario@181:   TRACE("input_variable_param_assignment_c");
msousa@449:   current_assign_direction = assign_in;
mario@181:   return handle_parameter_assignment(symbol->variable_name, symbol->expression);
mario@181: }
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 *function_call_param_iterator_c::visit(output_variable_param_assignment_c *symbol) {
mario@181:   TRACE("output_variable_param_assignment_c");
mario@181:   // TODO : Handle not_param !!!
mario@181:   if (NULL != symbol->not_param) ERROR;  // we do not yet support it, so it is best to simply stop than to fail silently...
mario@181: 
msousa@449:   current_assign_direction = assign_out;
mario@181:   return handle_parameter_assignment(symbol->variable_name, symbol->variable);
mario@181: }
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: