diff -r 01f6664bf8c5 -r 00f39a4b25fb absyntax_utils/search_il_label.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/absyntax_utils/search_il_label.cc	Fri Mar 02 17:59:20 2012 +0000
@@ -0,0 +1,97 @@
+/*
+ *  matiec - a compiler for the programming languages defined in IEC 61131-3
+ *
+ *  Copyright (C) 2012  Mario de Sousa (msousa@fe.up.pt)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * 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 compiler.
+ *
+ * Based on the
+ * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
+ *
+ */
+
+
+/*
+ *  Search for a specific label in an IL list. 
+ *
+ *  when instantiated, must be given a pointer to one of the following
+ *     - function_declaration_c
+ *     - function_block_declaration_c
+ *     - program_declaration_c
+ *     - instruction_list_c
+ *
+ * which is where all calls to search for a specific label will look for said label.
+ */
+
+
+
+#include "absyntax_utils.hh"
+
+
+
+/* set to 1 to see debug info during execution */
+static int debug = 0;
+
+search_il_label_c::search_il_label_c(symbol_c *search_scope) {
+  this->search_scope = search_scope;
+  this->search_label = NULL;
+}
+
+search_il_label_c::~search_il_label_c(void) {
+}
+
+
+il_instruction_c *search_il_label_c::find_label(const char *label) {
+  return find_label(new identifier_c(label));
+}
+
+
+il_instruction_c *search_il_label_c::find_label(symbol_c *label) {
+  search_label = label;
+  il_instruction_c *res = (il_instruction_c *)search_scope->accept(*this);
+  search_label = NULL;
+  return res;
+}
+
+
+/****************************************/
+/* B.2 - Language IL (Instruction List) */
+/****************************************/
+/***********************************/
+/* B 2.1 Instructions and Operands */
+/***********************************/
+
+/* | label ':' [il_incomplete_instruction] eol_list */
+// SYM_REF2(il_instruction_c, label, il_instruction)
+// void *visit(instruction_list_c *symbol);
+void *search_il_label_c::visit(il_instruction_c *symbol) {
+// printf("search_il_label_c::visit(il_instruction_c *symbol): searching for %s\n", ((identifier_c *)search_label)->value);
+	if (NULL != symbol->label)
+		if (compare_identifiers(search_label, symbol->label) == 0)
+			return symbol;
+
+	return NULL;
+}
+
+
+
+