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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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/* Returns the function block type declaration
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* of a specific function block instance.
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*/
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/* Returns the type name of a specific function block
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* instance. This class will search the variable
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* declarations inside the scope given to it
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* searching for the declaration of the function
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* block instance.
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*
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* The class constructor must be given the search scope
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* (function, function block or program within which
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* the function block instance was declared).
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*
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* This class will search the tree from the root given to the
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* constructor. Another option would be to build a symbol table,
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* and search that instead. Building the symbol table would be done
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* while visiting the variable declaration objects in the parse
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* tree. Unfortuantely, generate_c_c does not visit these
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* objects, delegating it to another class. This means that
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* we would need another specialised class just to build the
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* symbol table. We might just as well have a specialised class
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* that searches the tree itself for the relevant info. This
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* class is exactly that...!
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*/
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class search_fb_instance_decl_c: public search_visitor_c {
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private:
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symbol_c *search_scope;
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symbol_c *search_name;
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symbol_c *current_fb_type_name;
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public:
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search_fb_instance_decl_c(symbol_c *search_scope) {
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this->search_scope = search_scope;
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this->current_fb_type_name = NULL;
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}
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symbol_c *get_type_name(symbol_c *fb_instance_name) {
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this->search_name = fb_instance_name;
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return (symbol_c *)search_scope->accept(*this);
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}
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public:
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/***************************/
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/* B 0 - Programming Model */
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/***************************/
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void *visit(library_c *symbol) {
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/* we do not want to search multiple declaration scopes,
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* so we do not visit all the functions, fucntion blocks, etc...
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*/
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return NULL;
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}
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/******************************************/
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/* B 1.4.3 - Declaration & Initialisation */
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/******************************************/
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/* name_list ':' function_block_type_name ASSIGN structure_initialization */
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/* structure_initialization -> may be NULL ! */
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void *visit(fb_name_decl_c *symbol) {
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current_fb_type_name = symbol->function_block_type_name;
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return symbol->fb_name_list->accept(*this);
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}
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/* name_list ',' fb_name */
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void *visit(fb_name_list_c *symbol) {
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list_c *list = symbol;
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for(int i = 0; i < list->n; i++) {
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if (compare_identifiers(list->elements[i], search_name) == 0)
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/* by now, current_fb_declaration should be != NULL */
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return current_fb_type_name;
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}
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return NULL;
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}
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/**************************************/
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/* B.1.5 - Program organization units */
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/**************************************/
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/***********************/
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/* B 1.5.1 - Functions */
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/***********************/
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void *visit(function_declaration_c *symbol) {
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/* no need to search through all the body, so we only
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* visit the variable declarations...!
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*/
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return symbol->var_declarations_list->accept(*this);
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}
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/*****************************/
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/* B 1.5.2 - Function Blocks */
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/*****************************/
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void *visit(function_block_declaration_c *symbol) {
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/* no need to search through all the body, so we only
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* visit the variable declarations...!
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*/
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return symbol->var_declarations->accept(*this);
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}
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/**********************/
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/* B 1.5.3 - Programs */
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/**********************/
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void *visit(program_declaration_c *symbol) {
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/* no need to search through all the body, so we only
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* visit the variable declarations...!
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*/
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return symbol->var_declarations->accept(*this);
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}
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};
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