author | lbessard |
Fri, 12 Dec 2008 17:52:44 +0100 | |
changeset 157 | 3e12726f9d6b |
parent 146 | eef5e62048c7 |
permissions | -rwxr-xr-x |
70 | 1 |
/* |
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* (c) 2003 Mario de Sousa |
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* |
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* Offered to the public under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 of the |
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* License, or (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, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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* Public License for more details. |
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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 IL and ST 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 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 non-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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* This is part of the 4th stage that generates |
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* a c++ source program equivalent to the IL and ST |
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* code. |
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*/ |
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//#include <stdio.h> /* required for NULL */ |
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//#include <string> |
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//#include <iostream> |
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//#include "../../util/symtable.hh" |
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//#include "generate_c.hh" |
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#include "../../absyntax/visitor.hh" |
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/* |
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* Function call parameter iterator. |
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* It will iterate through the 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 non-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() will only iterate through formal parameters, |
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* and calls to search() will only serach through non-formal parameters. |
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*/ |
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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 next_param, param_count; |
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identifier_c *search_param_name; |
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/* Which operation of the class was called... |
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* Search a parameter, or iterate to the next parameter. |
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*/ |
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typedef enum {iterate_op, search_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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switch (current_operation) { |
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case iterate_op: |
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for(int i = 0; i < list->n; i++) { |
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void *res = list->elements[i]->accept(*this); |
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if (NULL != res) { |
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/* It went through the handle_parameter_assignment() function, |
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* and is therefore a parameter assignment (<param> = <value>), |
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* and not a simple expression (<value>). |
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*/ |
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/* we do nothing... */ |
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} else { |
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param_count++; |
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if (param_count == next_param) { |
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return list->elements[i]; |
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} |
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} |
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} |
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return NULL; |
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break; |
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case search_op: |
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for(int i = 0; i < list->n; i++) { |
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void *res = list->elements[i]->accept(*this); |
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if (res != NULL) |
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return res; |
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} |
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return NULL; |
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break; |
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} /* switch */ |
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return NULL; |
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} |
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void *handle_parameter_assignment(symbol_c *variable_name, symbol_c *expression) { |
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switch (current_operation) { |
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case iterate_op: |
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/* UGLY HACK -> this will be detected in the search_list() function */ |
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return (void *)this; /* anything, as long as it is not NULL!! */ |
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break; |
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case search_op: |
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identifier_c *variable_name2 = dynamic_cast<identifier_c *>(variable_name); |
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eef5e62048c7
Adding support for EN/ENO params in function and function blocks (standard function not supported yet)
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Adding support for EN/ENO params in function and function blocks (standard function not supported yet)
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if (variable_name2 == NULL) { |
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en_param_c *en_param = dynamic_cast<en_param_c *>(variable_name); |
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if (en_param != NULL) |
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variable_name2 = new identifier_c("EN"); |
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} |
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Adding support for EN/ENO params in function and function blocks (standard function not supported yet)
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if (variable_name2 == NULL) { |
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eno_param_c *eno_param = dynamic_cast<eno_param_c *>(variable_name); |
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if (eno_param != NULL) |
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Adding support for EN/ENO params in function and function blocks (standard function not supported yet)
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variable_name2 = new identifier_c("ENO"); |
eef5e62048c7
Adding support for EN/ENO params in function and function blocks (standard function not supported yet)
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parents:
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} |
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Adding support for EN/ENO params in function and function blocks (standard function not supported yet)
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if (variable_name2 == NULL) ERROR; |
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eef5e62048c7
Adding support for EN/ENO params in function and function blocks (standard function not supported yet)
lbessard
parents:
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if (strcasecmp(search_param_name->value, variable_name2->value) == 0) |
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/* FOUND! This is the same parameter!! */ |
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return (void *)expression; |
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return NULL; |
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break; |
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} |
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ERROR; |
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return NULL; |
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} |
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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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next_param = param_count = 0; |
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} |
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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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/* It is expected that f_call will reference one of the following: |
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* program_configuration_c |
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* function_invocation_c |
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* fb_invocation_c |
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* il_function_call_c |
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* il_formal_funct_call_c |
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* ... (have I missed any?) |
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*/ |
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this->f_call = f_call; |
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search_param_name = NULL; |
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reset(); |
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} |
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/* Skip to the next 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(void) { |
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param_count = 0; |
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next_param++; |
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current_operation = function_call_param_iterator_c::iterate_op; |
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void *res = f_call->accept(*this); |
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return (symbol_c *)res; |
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} |
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/* Search for the value passed to the parameter named <param_name>... */ |
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symbol_c *search(symbol_c *param_name) { |
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if (NULL == param_name) ERROR; |
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search_param_name = dynamic_cast<identifier_c *>(param_name); |
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if (NULL == search_param_name) ERROR; |
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current_operation = function_call_param_iterator_c::search_op; |
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void *res = f_call->accept(*this); |
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return (symbol_c *)res; |
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} |
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208 |
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209 |
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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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214 |
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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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241 |
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242 |
/* 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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256 |
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257 |
/* 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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274 |
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275 |
/* TASK task_name task_initialization */ |
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276 |
/* |
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277 |
SYM_REF2(task_configuration_c, task_name, task_initialization) |
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*/ |
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279 |
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280 |
/* '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */ |
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281 |
/* |
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282 |
SYM_REF4(task_initialization_c, single_data_source, interval_data_source, priority_data_source, unused) |
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283 |
*/ |
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284 |
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285 |
/* PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */ |
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286 |
// SYM_REF6(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements, unused) |
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287 |
void *visit(program_configuration_c *symbol) { |
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288 |
TRACE("program_configuration_c"); |
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289 |
return symbol->prog_conf_elements->accept(*this); |
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} |
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291 |
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292 |
/* prog_conf_elements ',' prog_conf_element */ |
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293 |
// SYM_LIST(prog_conf_elements_c) |
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294 |
void *visit(prog_conf_elements_c *symbol) { |
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295 |
TRACE("prog_conf_elements_c"); |
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296 |
return search_list(symbol); |
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297 |
} |
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298 |
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299 |
/* fb_name WITH task_name */ |
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300 |
/* |
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301 |
SYM_REF2(fb_task_c, fb_name, task_name) |
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302 |
*/ |
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303 |
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304 |
/* any_symbolic_variable ASSIGN prog_data_source */ |
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305 |
// SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source) |
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306 |
void *visit(prog_cnxn_assign_c *symbol) { |
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307 |
TRACE("prog_cnxn_assign_c"); |
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308 |
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309 |
/* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario) |
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310 |
* do not understand the semantics that should be implmeneted if it is not a |
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311 |
* symbolic_variable, so for the moment we simply give up! |
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312 |
*/ |
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313 |
symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable); |
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314 |
if (NULL == symb_var) |
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315 |
ERROR; |
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316 |
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317 |
return handle_parameter_assignment(symb_var->var_name, symbol->prog_data_source); |
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318 |
} |
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319 |
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320 |
/* any_symbolic_variable SENDTO data_sink */ |
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321 |
// SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, prog_data_source) |
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322 |
void *visit(prog_cnxn_sendto_c *symbol) { |
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323 |
TRACE("prog_cnxn_sendto_c"); |
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324 |
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325 |
/* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario) |
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326 |
* do not understand the semantics that should be implmeneted if it is not a |
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327 |
* symbolic_variable, so for the moment we simply give up! |
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328 |
*/ |
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329 |
symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable); |
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330 |
if (NULL == symb_var) |
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331 |
ERROR; |
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332 |
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333 |
return handle_parameter_assignment(symb_var->var_name, symbol->data_sink); |
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334 |
} |
|
335 |
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336 |
/* VAR_CONFIG instance_specific_init_list END_VAR */ |
|
337 |
/* |
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338 |
SYM_REF2(instance_specific_initializations_c, instance_specific_init_list, unused) |
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339 |
*/ |
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340 |
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341 |
/* helper symbol for instance_specific_initializations */ |
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342 |
/* |
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343 |
SYM_LIST(instance_specific_init_list_c) |
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344 |
*/ |
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345 |
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346 |
/* resource_name '.' program_name '.' {fb_name '.'} |
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347 |
((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization)) |
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348 |
*/ |
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349 |
/* |
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350 |
SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization) |
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351 |
*/ |
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352 |
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353 |
/* helper symbol for instance_specific_init */ |
|
354 |
/* function_block_type_name ':=' structure_initialization */ |
|
355 |
/* |
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356 |
SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization) |
|
357 |
*/ |
|
358 |
||
359 |
||
360 |
||
361 |
||
362 |
||
363 |
||
364 |
/****************************************/ |
|
365 |
/* B.2 - Language IL (Instruction List) */ |
|
366 |
/****************************************/ |
|
367 |
/***********************************/ |
|
368 |
/* B 2.1 Instructions and Operands */ |
|
369 |
/***********************************/ |
|
370 |
||
371 |
/* | function_name [il_operand_list] */ |
|
372 |
// SYM_REF2(il_function_call_c, function_name, il_operand_list) |
|
373 |
void *visit(il_function_call_c *symbol) { |
|
374 |
TRACE("il_function_call_c"); |
|
375 |
if (NULL != symbol->il_operand_list) |
|
376 |
return symbol->il_operand_list->accept(*this); |
|
377 |
return NULL; |
|
378 |
} |
|
379 |
||
380 |
||
381 |
/* | function_name '(' eol_list [il_param_list] ')' */ |
|
382 |
// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list) |
|
383 |
void *visit(il_formal_funct_call_c *symbol) { |
|
384 |
TRACE("il_formal_funct_call_c"); |
|
385 |
if (NULL != symbol->il_param_list) |
|
386 |
return symbol->il_param_list->accept(*this); |
|
387 |
return NULL; |
|
388 |
} |
|
389 |
||
390 |
||
391 |
/* il_call_operator prev_declared_fb_name |
|
392 |
* | il_call_operator prev_declared_fb_name '(' ')' |
|
393 |
* | il_call_operator prev_declared_fb_name '(' eol_list ')' |
|
394 |
* | il_call_operator prev_declared_fb_name '(' il_operand_list ')' |
|
395 |
* | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')' |
|
396 |
*/ |
|
397 |
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list) |
|
398 |
void *visit(il_fb_call_c *symbol) { |
|
399 |
TRACE("il_fb_call_c"); |
|
400 |
/* the following should never occur. In reality the syntax parser |
|
401 |
* will guarantee that they never occur, but it makes it easier to |
|
402 |
* understand the remaining code :-) |
|
403 |
*/ |
|
404 |
//if ((NULL == symbol->il_operand_list) && (NULL == symbol->il_param_list)) ERROR; |
|
405 |
//if ((NULL != symbol->il_operand_list) && (NULL != symbol->il_param_list)) ERROR; |
|
406 |
||
407 |
if (NULL != symbol->il_operand_list) |
|
408 |
return symbol->il_operand_list->accept(*this); |
|
409 |
if (NULL != symbol->il_param_list) |
|
410 |
return symbol->il_param_list->accept(*this); |
|
411 |
return NULL; |
|
412 |
} |
|
413 |
||
414 |
||
415 |
||
416 |
/* | il_operand_list ',' il_operand */ |
|
417 |
// SYM_LIST(il_operand_list_c) |
|
418 |
void *visit(il_operand_list_c *symbol) { |
|
419 |
TRACE("il_operand_list_c"); |
|
420 |
return search_list(symbol); |
|
421 |
} |
|
422 |
||
423 |
||
424 |
/* | il_initial_param_list il_param_instruction */ |
|
425 |
// SYM_LIST(il_param_list_c) |
|
426 |
void *visit(il_param_list_c *symbol) { |
|
427 |
TRACE("il_param_list_c"); |
|
428 |
return search_list(symbol); |
|
429 |
} |
|
430 |
||
431 |
/* il_assign_operator il_operand |
|
432 |
* | il_assign_operator '(' eol_list simple_instr_list ')' |
|
433 |
*/ |
|
434 |
// SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused) |
|
435 |
void *visit(il_param_assignment_c *symbol) { |
|
436 |
TRACE("il_param_assignment_c"); |
|
437 |
||
438 |
// TODO : We do not yet handle a instruction list passed as parameter !!! |
|
439 |
// since we do not yet support it, it is best to simply stop than to fail silently... |
|
440 |
if (NULL != symbol->simple_instr_list) ERROR; |
|
441 |
||
442 |
return handle_parameter_assignment(symbol->il_assign_operator, symbol->il_operand); |
|
443 |
} |
|
444 |
||
445 |
/* il_assign_out_operator variable */ |
|
446 |
// SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable); |
|
447 |
void *visit(il_param_out_assignment_c *symbol) { |
|
448 |
TRACE("il_param_out_assignment_c"); |
|
449 |
return handle_parameter_assignment((symbol_c *)symbol->il_assign_out_operator->accept(*this), symbol->variable); |
|
450 |
} |
|
451 |
||
452 |
||
453 |
/*******************/ |
|
454 |
/* B 2.2 Operators */ |
|
455 |
/*******************/ |
|
456 |
/*| [NOT] any_identifier SENDTO */ |
|
457 |
// SYM_REF2(il_assign_out_operator_c, option, variable_name) |
|
458 |
void *visit(il_assign_out_operator_c *symbol) { |
|
459 |
TRACE("il_assign_out_operator_c"); |
|
460 |
||
461 |
// TODO : Handle not_param !!! |
|
462 |
// we do not yet support it, so it is best to simply stop than to fail silently... |
|
463 |
if (NULL != symbol->option) ERROR; |
|
464 |
||
465 |
return (void *)symbol->variable_name; |
|
466 |
} |
|
467 |
||
468 |
||
469 |
||
470 |
||
471 |
/***************************************/ |
|
472 |
/* B.3 - Language ST (Structured Text) */ |
|
473 |
/***************************************/ |
|
474 |
/***********************/ |
|
475 |
/* B 3.1 - Expressions */ |
|
476 |
/***********************/ |
|
477 |
||
478 |
/* |
|
479 |
SYM_REF2(function_invocation_c, function_name, parameter_assignment_list) |
|
480 |
*/ |
|
481 |
void *visit(function_invocation_c *symbol) { |
|
482 |
TRACE("function_invocation_c"); |
|
483 |
if ((symbol_c *)symbol == f_call && symbol->parameter_assignment_list != NULL) |
|
484 |
return symbol->parameter_assignment_list->accept(*this); |
|
485 |
else |
|
486 |
return NULL; |
|
487 |
} |
|
488 |
||
489 |
||
490 |
||
491 |
||
492 |
/********************/ |
|
493 |
/* B 3.2 Statements */ |
|
494 |
/********************/ |
|
495 |
||
496 |
/*********************************/ |
|
497 |
/* B 3.2.1 Assignment Statements */ |
|
498 |
/*********************************/ |
|
499 |
/* |
|
500 |
SYM_REF2(assignment_statement_c, l_exp, r_exp) |
|
501 |
*/ |
|
502 |
||
503 |
/*****************************************/ |
|
504 |
/* B 3.2.2 Subprogram Control Statements */ |
|
505 |
/*****************************************/ |
|
506 |
/* RETURN */ |
|
507 |
// SYM_REF0(return_statement_c) |
|
508 |
||
509 |
||
510 |
/* fb_name '(' [param_assignment_list] ')' */ |
|
511 |
/* param_assignment_list -> may be NULL ! */ |
|
512 |
// SYM_REF2(fb_invocation_c, fb_name, param_assignment_list) |
|
513 |
void *visit(fb_invocation_c *symbol) { |
|
514 |
TRACE("fb_invocation_c"); |
|
515 |
if (symbol->param_assignment_list != NULL) |
|
516 |
return symbol->param_assignment_list->accept(*this); |
|
517 |
else |
|
518 |
return NULL; |
|
519 |
} |
|
520 |
||
521 |
/* helper symbol for fb_invocation */ |
|
522 |
/* param_assignment_list ',' param_assignment */ |
|
523 |
// SYM_LIST(param_assignment_list_c) |
|
524 |
void *visit(param_assignment_list_c *symbol) { |
|
525 |
TRACE("param_assignment_list_c"); |
|
526 |
return search_list(symbol); |
|
527 |
} |
|
528 |
||
529 |
/* variable_name ASSIGN expression */ |
|
530 |
// SYM_REF2(input_variable_param_assignment_c, variable_name, expression) |
|
531 |
void *visit(input_variable_param_assignment_c *symbol) { |
|
532 |
TRACE("input_variable_param_assignment_c"); |
|
533 |
return handle_parameter_assignment(symbol->variable_name, symbol->expression); |
|
534 |
} |
|
535 |
||
536 |
/* [NOT] variable_name '=>' variable */ |
|
537 |
// SYM_REF4(output_variable_param_assignment_c, not_param, variable_name, variable, unused) |
|
538 |
void *visit(output_variable_param_assignment_c *symbol) { |
|
539 |
TRACE("output_variable_param_assignment_c"); |
|
540 |
// TODO : Handle not_param !!! |
|
541 |
if (NULL != symbol->not_param) ERROR; // we do not yet support it, so it is best to simply stop than to fail silently... |
|
542 |
||
543 |
return handle_parameter_assignment(symbol->variable_name, symbol->variable); |
|
544 |
} |
|
545 |
||
546 |
/* helper CLASS for output_variable_param_assignment */ |
|
547 |
// SYM_REF0(not_paramassign_c) |
|
548 |
// TODO... ??? |
|
549 |
||
550 |
||
551 |
||
552 |
||
553 |
||
554 |
}; |
|
555 |
||
556 |
||
557 |
||
558 |
||
559 |
||
560 |