msousa@460: /*
msousa@460:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
msousa@460:  *
msousa@460:  *  Copyright (C) 2012  Mario de Sousa (msousa@fe.up.pt)
msousa@460:  *
msousa@460:  *  This program is free software: you can redistribute it and/or modify
msousa@460:  *  it under the terms of the GNU General Public License as published by
msousa@460:  *  the Free Software Foundation, either version 3 of the License, or
msousa@460:  *  (at your option) any later version.
msousa@460:  *
msousa@460:  *  This program is distributed in the hope that it will be useful,
msousa@460:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@460:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
msousa@460:  *  GNU General Public License for more details.
msousa@460:  *
msousa@460:  *  You should have received a copy of the GNU General Public License
msousa@460:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
msousa@460:  *
msousa@460:  *
msousa@460:  * This code is made available on the understanding that it will not be
msousa@460:  * used in safety-critical situations without a full and competent review.
msousa@460:  */
msousa@460: 
msousa@460: /*
msousa@460:  * An IEC 61131-3 compiler.
msousa@460:  *
msousa@460:  * Based on the
msousa@460:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
msousa@460:  *
msousa@460:  */
msousa@460: 
msousa@460: 
msousa@460: /*
msousa@460:  *  Search for a specific label in an IL list. 
msousa@460:  *
msousa@460:  *  when instantiated, must be given a pointer to one of the following
msousa@460:  *     - function_declaration_c
msousa@460:  *     - function_block_declaration_c
msousa@460:  *     - program_declaration_c
msousa@460:  *     - instruction_list_c
msousa@460:  *
msousa@460:  * which is where all calls to search for a specific label will look for said label.
msousa@460:  */
msousa@460: 
msousa@460: 
msousa@460: 
msousa@460: #include "absyntax_utils.hh"
msousa@460: 
msousa@460: 
msousa@460: 
msousa@460: /* set to 1 to see debug info during execution */
msousa@460: static int debug = 0;
msousa@460: 
msousa@460: search_il_label_c::search_il_label_c(symbol_c *search_scope) {
msousa@460:   this->search_scope = search_scope;
msousa@460:   this->search_label = NULL;
msousa@460: }
msousa@460: 
msousa@460: search_il_label_c::~search_il_label_c(void) {
msousa@460: }
msousa@460: 
msousa@460: 
msousa@460: il_instruction_c *search_il_label_c::find_label(const char *label) {
msousa@460:   return find_label(new identifier_c(label));
msousa@460: }
msousa@460: 
msousa@460: 
msousa@460: il_instruction_c *search_il_label_c::find_label(symbol_c *label) {
msousa@460:   search_label = label;
msousa@460:   il_instruction_c *res = (il_instruction_c *)search_scope->accept(*this);
msousa@460:   search_label = NULL;
msousa@460:   return res;
msousa@460: }
msousa@460: 
msousa@460: 
msousa@460: /****************************************/
msousa@460: /* B.2 - Language IL (Instruction List) */
msousa@460: /****************************************/
msousa@460: /***********************************/
msousa@460: /* B 2.1 Instructions and Operands */
msousa@460: /***********************************/
msousa@460: 
msousa@460: /* | label ':' [il_incomplete_instruction] eol_list */
msousa@460: // SYM_REF2(il_instruction_c, label, il_instruction)
msousa@460: // void *visit(instruction_list_c *symbol);
msousa@460: void *search_il_label_c::visit(il_instruction_c *symbol) {
msousa@460: // printf("search_il_label_c::visit(il_instruction_c *symbol): searching for %s\n", ((identifier_c *)search_label)->value);
msousa@460: 	if (NULL != symbol->label)
msousa@460: 		if (compare_identifiers(search_label, symbol->label) == 0)
msousa@460: 			return symbol;
msousa@460: 
msousa@460: 	return NULL;
msousa@460: }
msousa@460: 
msousa@460: 
msousa@460: 
msousa@460: