diff -r 41cb5b80416e -r e1f0ebd2d9ec stage4/generate_cc/search_fb_instance_decl.cc --- a/stage4/generate_cc/search_fb_instance_decl.cc Tue Oct 23 10:35:58 2007 +0200 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,141 +0,0 @@ -/* - * (c) 2003 Mario de Sousa - * - * Offered to the public under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 of the - * License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General - * Public License for more details. - * - * This code is made available on the understanding that it will not be - * used in safety-critical situations without a full and competent review. - */ - -/* - * An IEC 61131-3 IL and ST compiler. - * - * Based on the - * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) - * - */ - - -/* Returns the function block type declaration - * of a specific function block instance. - */ - - - -/* Returns the type name of a specific function block - * instance. This class will search the variable - * declarations inside the scope given to it - * searching for the declaration of the function - * block instance. - * - * The class constructor must be given the search scope - * (function, function block or program within which - * the function block instance was declared). - * - * This class will search the tree from the root given to the - * constructor. Another option would be to build a symbol table, - * and search that instead. Building the symbol table would be done - * while visiting the variable declaration objects in the parse - * tree. Unfortuantely, generate_cc_c does not visit these - * objects, delegating it to another class. This means that - * we would need another specialised class just to build the - * symbol table. We might just as well have a specialised class - * that searches the tree itself for the relevant info. This - * class is exactly that...! - */ -class search_fb_instance_decl_c: public search_visitor_c { - - private: - symbol_c *search_scope; - - symbol_c *search_name; - symbol_c *current_fb_type_name; - - public: - search_fb_instance_decl_c(symbol_c *search_scope) { - this->search_scope = search_scope; - this->current_fb_type_name = NULL; - } - - symbol_c *get_type_name(symbol_c *fb_instance_name) { - this->search_name = fb_instance_name; - return (symbol_c *)search_scope->accept(*this); - } - - public: -/***************************/ -/* B 0 - Programming Model */ -/***************************/ - void *visit(library_c *symbol) { - /* we do not want to search multiple declaration scopes, - * so we do not visit all the functions, fucntion blocks, etc... - */ - return NULL; - } - -/******************************************/ -/* B 1.4.3 - Declaration & Initialisation */ -/******************************************/ - -/* name_list ':' function_block_type_name ASSIGN structure_initialization */ -/* structure_initialization -> may be NULL ! */ - void *visit(fb_name_decl_c *symbol) { - current_fb_type_name = symbol->function_block_type_name; - return symbol->fb_name_list->accept(*this); - } - -/* name_list ',' fb_name */ - void *visit(fb_name_list_c *symbol) { - list_c *list = symbol; - for(int i = 0; i < list->n; i++) { - if (compare_identifiers(list->elements[i], search_name) == 0) - /* by now, current_fb_declaration should be != NULL */ - return current_fb_type_name; - } - return NULL; - } - -/**************************************/ -/* B.1.5 - Program organization units */ -/**************************************/ -/***********************/ -/* B 1.5.1 - Functions */ -/***********************/ - void *visit(function_declaration_c *symbol) { - /* no need to search through all the body, so we only - * visit the variable declarations...! - */ - return symbol->var_declarations_list->accept(*this); - } - -/*****************************/ -/* B 1.5.2 - Function Blocks */ -/*****************************/ - void *visit(function_block_declaration_c *symbol) { - /* no need to search through all the body, so we only - * visit the variable declarations...! - */ - return symbol->var_declarations->accept(*this); - } - -/**********************/ -/* B 1.5.3 - Programs */ -/**********************/ - void *visit(program_declaration_c *symbol) { - /* no need to search through all the body, so we only - * visit the variable declarations...! - */ - return symbol->var_declarations->accept(*this); - } -}; - - - -