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/*
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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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if (variable_name2 == NULL) ERROR;
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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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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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TRACE("program_configuration_c");
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return symbol->prog_conf_elements->accept(*this);
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}
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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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TRACE("prog_conf_elements_c");
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return search_list(symbol);
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}
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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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TRACE("prog_cnxn_assign_c");
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/* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)
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* do not understand the semantics that should be implmeneted if it is not a
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* symbolic_variable, so for the moment we simply give up!
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*/
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symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);
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if (NULL == symb_var)
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ERROR;
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return handle_parameter_assignment(symb_var->var_name, symbol->prog_data_source);
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}
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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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TRACE("prog_cnxn_sendto_c");
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/* NOTE: symbolic_variable may be something other than a symbolic_variable_c, but I (Mario)
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* do not understand the semantics that should be implmeneted if it is not a
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* symbolic_variable, so for the moment we simply give up!
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*/
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symbolic_variable_c *symb_var = dynamic_cast<symbolic_variable_c *>(symbol->symbolic_variable);
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if (NULL == symb_var)
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ERROR;
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return handle_parameter_assignment(symb_var->var_name, symbol->data_sink);
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}
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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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TRACE("il_function_call_c");
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if (NULL != symbol->il_operand_list)
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return symbol->il_operand_list->accept(*this);
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return NULL;
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364 |
}
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365 |
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366 |
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|
367 |
/* | function_name '(' eol_list [il_param_list] ')' */
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|
368 |
// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list)
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369 |
void *visit(il_formal_funct_call_c *symbol) {
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|
370 |
TRACE("il_formal_funct_call_c");
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|
371 |
if (NULL != symbol->il_param_list)
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|
372 |
return symbol->il_param_list->accept(*this);
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|
373 |
return NULL;
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|
374 |
}
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|
375 |
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376 |
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|
377 |
/* il_call_operator prev_declared_fb_name
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|
378 |
* | il_call_operator prev_declared_fb_name '(' ')'
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|
379 |
* | il_call_operator prev_declared_fb_name '(' eol_list ')'
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|
380 |
* | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
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|
381 |
* | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
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|
|
382 |
*/
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|
|
383 |
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)
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|
384 |
void *visit(il_fb_call_c *symbol) {
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|
385 |
TRACE("il_fb_call_c");
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|
386 |
/* the following should never occur. In reality the syntax parser
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|
|
387 |
* will guarantee that they never occur, but it makes it easier to
|
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|
388 |
* understand the remaining code :-)
|
|
|
389 |
*/
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|
|
390 |
//if ((NULL == symbol->il_operand_list) && (NULL == symbol->il_param_list)) ERROR;
|
|
|
391 |
//if ((NULL != symbol->il_operand_list) && (NULL != symbol->il_param_list)) ERROR;
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|
|
392 |
|
|
|
393 |
if (NULL != symbol->il_operand_list)
|
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|
394 |
return symbol->il_operand_list->accept(*this);
|
|
|
395 |
if (NULL != symbol->il_param_list)
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|
396 |
return symbol->il_param_list->accept(*this);
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|
|
397 |
return NULL;
|
|
|
398 |
}
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|
399 |
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|
|
400 |
|
|
|
401 |
|
|
|
402 |
/* | il_operand_list ',' il_operand */
|
|
|
403 |
// SYM_LIST(il_operand_list_c)
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|
|
404 |
void *visit(il_operand_list_c *symbol) {
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|
|
405 |
TRACE("il_operand_list_c");
|
|
|
406 |
return search_list(symbol);
|
|
|
407 |
}
|
|
|
408 |
|
|
|
409 |
|
|
|
410 |
/* | il_initial_param_list il_param_instruction */
|
|
|
411 |
// SYM_LIST(il_param_list_c)
|
|
|
412 |
void *visit(il_param_list_c *symbol) {
|
|
|
413 |
TRACE("il_param_list_c");
|
|
|
414 |
return search_list(symbol);
|
|
|
415 |
}
|
|
|
416 |
|
|
|
417 |
/* il_assign_operator il_operand
|
|
|
418 |
* | il_assign_operator '(' eol_list simple_instr_list ')'
|
|
|
419 |
*/
|
|
|
420 |
// SYM_REF4(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list, unused)
|
|
|
421 |
void *visit(il_param_assignment_c *symbol) {
|
|
|
422 |
TRACE("il_param_assignment_c");
|
|
|
423 |
|
|
|
424 |
// TODO : We do not yet handle a instruction list passed as parameter !!!
|
|
|
425 |
// since we do not yet support it, it is best to simply stop than to fail silently...
|
|
|
426 |
if (NULL != symbol->simple_instr_list) ERROR;
|
|
|
427 |
|
|
|
428 |
return handle_parameter_assignment(symbol->il_assign_operator, symbol->il_operand);
|
|
|
429 |
}
|
|
|
430 |
|
|
|
431 |
/* il_assign_out_operator variable */
|
|
|
432 |
// SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable);
|
|
|
433 |
void *visit(il_param_out_assignment_c *symbol) {
|
|
|
434 |
TRACE("il_param_out_assignment_c");
|
|
|
435 |
return handle_parameter_assignment((symbol_c *)symbol->il_assign_out_operator->accept(*this), symbol->variable);
|
|
|
436 |
}
|
|
|
437 |
|
|
|
438 |
|
|
|
439 |
/*******************/
|
|
|
440 |
/* B 2.2 Operators */
|
|
|
441 |
/*******************/
|
|
|
442 |
/*| [NOT] any_identifier SENDTO */
|
|
|
443 |
// SYM_REF2(il_assign_out_operator_c, option, variable_name)
|
|
|
444 |
void *visit(il_assign_out_operator_c *symbol) {
|
|
|
445 |
TRACE("il_assign_out_operator_c");
|
|
|
446 |
|
|
|
447 |
// TODO : Handle not_param !!!
|
|
|
448 |
// we do not yet support it, so it is best to simply stop than to fail silently...
|
|
|
449 |
if (NULL != symbol->option) ERROR;
|
|
|
450 |
|
|
|
451 |
return (void *)symbol->variable_name;
|
|
|
452 |
}
|
|
|
453 |
|
|
|
454 |
|
|
|
455 |
|
|
|
456 |
|
|
|
457 |
/***************************************/
|
|
|
458 |
/* B.3 - Language ST (Structured Text) */
|
|
|
459 |
/***************************************/
|
|
|
460 |
/***********************/
|
|
|
461 |
/* B 3.1 - Expressions */
|
|
|
462 |
/***********************/
|
|
|
463 |
|
|
|
464 |
/*
|
|
|
465 |
SYM_REF2(function_invocation_c, function_name, parameter_assignment_list)
|
|
|
466 |
*/
|
|
|
467 |
void *visit(function_invocation_c *symbol) {
|
|
|
468 |
TRACE("function_invocation_c");
|
|
|
469 |
if ((symbol_c *)symbol == f_call && symbol->parameter_assignment_list != NULL)
|
|
|
470 |
return symbol->parameter_assignment_list->accept(*this);
|
|
|
471 |
else
|
|
|
472 |
return NULL;
|
|
|
473 |
}
|
|
|
474 |
|
|
|
475 |
|
|
|
476 |
|
|
|
477 |
|
|
|
478 |
/********************/
|
|
|
479 |
/* B 3.2 Statements */
|
|
|
480 |
/********************/
|
|
|
481 |
|
|
|
482 |
/*********************************/
|
|
|
483 |
/* B 3.2.1 Assignment Statements */
|
|
|
484 |
/*********************************/
|
|
|
485 |
/*
|
|
|
486 |
SYM_REF2(assignment_statement_c, l_exp, r_exp)
|
|
|
487 |
*/
|
|
|
488 |
|
|
|
489 |
/*****************************************/
|
|
|
490 |
/* B 3.2.2 Subprogram Control Statements */
|
|
|
491 |
/*****************************************/
|
|
|
492 |
/* RETURN */
|
|
|
493 |
// SYM_REF0(return_statement_c)
|
|
|
494 |
|
|
|
495 |
|
|
|
496 |
/* fb_name '(' [param_assignment_list] ')' */
|
|
|
497 |
/* param_assignment_list -> may be NULL ! */
|
|
|
498 |
// SYM_REF2(fb_invocation_c, fb_name, param_assignment_list)
|
|
|
499 |
void *visit(fb_invocation_c *symbol) {
|
|
|
500 |
TRACE("fb_invocation_c");
|
|
|
501 |
if (symbol->param_assignment_list != NULL)
|
|
|
502 |
return symbol->param_assignment_list->accept(*this);
|
|
|
503 |
else
|
|
|
504 |
return NULL;
|
|
|
505 |
}
|
|
|
506 |
|
|
|
507 |
/* helper symbol for fb_invocation */
|
|
|
508 |
/* param_assignment_list ',' param_assignment */
|
|
|
509 |
// SYM_LIST(param_assignment_list_c)
|
|
|
510 |
void *visit(param_assignment_list_c *symbol) {
|
|
|
511 |
TRACE("param_assignment_list_c");
|
|
|
512 |
return search_list(symbol);
|
|
|
513 |
}
|
|
|
514 |
|
|
|
515 |
/* variable_name ASSIGN expression */
|
|
|
516 |
// SYM_REF2(input_variable_param_assignment_c, variable_name, expression)
|
|
|
517 |
void *visit(input_variable_param_assignment_c *symbol) {
|
|
|
518 |
TRACE("input_variable_param_assignment_c");
|
|
|
519 |
return handle_parameter_assignment(symbol->variable_name, symbol->expression);
|
|
|
520 |
}
|
|
|
521 |
|
|
|
522 |
/* [NOT] variable_name '=>' variable */
|
|
|
523 |
// SYM_REF4(output_variable_param_assignment_c, not_param, variable_name, variable, unused)
|
|
|
524 |
void *visit(output_variable_param_assignment_c *symbol) {
|
|
|
525 |
TRACE("output_variable_param_assignment_c");
|
|
|
526 |
// TODO : Handle not_param !!!
|
|
|
527 |
if (NULL != symbol->not_param) ERROR; // we do not yet support it, so it is best to simply stop than to fail silently...
|
|
|
528 |
|
|
|
529 |
return handle_parameter_assignment(symbol->variable_name, symbol->variable);
|
|
|
530 |
}
|
|
|
531 |
|
|
|
532 |
/* helper CLASS for output_variable_param_assignment */
|
|
|
533 |
// SYM_REF0(not_paramassign_c)
|
|
|
534 |
// TODO... ???
|
|
|
535 |
|
|
|
536 |
|
|
|
537 |
|
|
|
538 |
|
|
|
539 |
|
|
|
540 |
};
|
|
|
541 |
|
|
|
542 |
|
|
|
543 |
|
|
|
544 |
|
|
|
545 |
|
|
|
546 |
|