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/*

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 *  matiec - a compiler for the programming languages defined in IEC 61131-3

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 *

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 *  Copyright (C) 2012  Mario de Sousa (msousa@fe.up.pt)

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 *

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 *  This program is free software: you can redistribute it and/or modify

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 *  it under the terms of the GNU General Public License as published by

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 *  the Free Software Foundation, either version 3 of the License, or

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 *  (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,

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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License

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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

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 *

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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 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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 *  Search for a specific label in an IL list. 

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 *

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 *  when instantiated, must be given a pointer to one of the following

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 *     - function_declaration_c

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 *     - function_block_declaration_c

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 *     - program_declaration_c

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 *     - instruction_list_c

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 *

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 * which is where all calls to search for a specific label will look for said label.

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 */

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#include "absyntax_utils.hh"

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/* set to 1 to see debug info during execution */

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static int debug = 0;

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search_il_label_c::search_il_label_c(symbol_c *search_scope) {

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  this->search_scope = search_scope;

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  this->search_label = NULL;

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}

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search_il_label_c::~search_il_label_c(void) {

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}

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il_instruction_c *search_il_label_c::find_label(const char *label) {

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  return find_label(new identifier_c(label));

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}

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il_instruction_c *search_il_label_c::find_label(symbol_c *label) {

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  search_label = label;

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  il_instruction_c *res = (il_instruction_c *)search_scope->accept(*this);

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  search_label = NULL;

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  return res;

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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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/* | label ':' [il_incomplete_instruction] eol_list */

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// SYM_REF2(il_instruction_c, label, il_instruction)

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// void *visit(instruction_list_c *symbol);

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void *search_il_label_c::visit(il_instruction_c *symbol) {

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// printf("search_il_label_c::visit(il_instruction_c *symbol): searching for %s\n", ((identifier_c *)search_label)->value);

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	if (NULL != symbol->label)

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		if (compare_identifiers(search_label, symbol->label) == 0)

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			return symbol;

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	return NULL;

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}

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