msousa@443: /*
msousa@443:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
msousa@443:  *
msousa@443:  *  Copyright (C) 2012  Mario de Sousa (msousa@fe.up.pt)
msousa@443:  *
msousa@443:  *  This program is free software: you can redistribute it and/or modify
msousa@443:  *  it under the terms of the GNU General Public License as published by
msousa@443:  *  the Free Software Foundation, either version 3 of the License, or
msousa@443:  *  (at your option) any later version.
msousa@443:  *
msousa@443:  *  This program is distributed in the hope that it will be useful,
msousa@443:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
msousa@443:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
msousa@443:  *  GNU General Public License for more details.
msousa@443:  *
msousa@443:  *  You should have received a copy of the GNU General Public License
msousa@443:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
msousa@443:  *
msousa@443:  *
msousa@443:  * This code is made available on the understanding that it will not be
msousa@443:  * used in safety-critical situations without a full and competent review.
msousa@443:  */
msousa@443: 
msousa@443: /*
msousa@443:  * An IEC 61131-3 compiler.
msousa@443:  *
msousa@443:  * Based on the
msousa@443:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
msousa@443:  *
msousa@443:  */
msousa@443: 
msousa@443: 
msousa@443: /*
msousa@443:  *  Do flow control analysis of the IEC 61131-3 code.
msousa@443:  *
msousa@443:  *  We currently only do this for IL code.
msousa@443:  *  This class will annotate the abstract syntax tree, by filling in the
msousa@443:  *  prev_il_instruction variable in the il_instruction_c, so it points to
msousa@443:  *  the previous il_instruction_c object in the instruction list instruction_list_c.
msousa@443:  */
msousa@443: 
msousa@443: #include "flow_control_analysis.hh"
msousa@443: 
msousa@443: 
msousa@443: 
msousa@443: /* set to 1 to see debug info during execution */
msousa@443: static int debug = 0;
msousa@443: 
msousa@443: flow_control_analysis_c::flow_control_analysis_c(symbol_c *ignore) {
msousa@443: }
msousa@443: 
msousa@443: flow_control_analysis_c::~flow_control_analysis_c(void) {
msousa@443: }
msousa@443: 
msousa@443: 
msousa@443: 
msousa@443: /************************************/
msousa@443: /* B 1.5 Program organization units */
msousa@443: /************************************/
msousa@443: /*********************/
msousa@443: /* B 1.5.1 Functions */
msousa@443: /*********************/
msousa@443: void *flow_control_analysis_c::visit(function_declaration_c *symbol) {
msousa@443: 	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@443: 	if (debug) printf("Doing flow control analysis in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value);
msousa@443: 	symbol->function_body->accept(*this);
msousa@443: 	delete search_varfb_instance_type;
msousa@443: 	search_varfb_instance_type = NULL;
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: /***************************/
msousa@443: /* B 1.5.2 Function blocks */
msousa@443: /***************************/
msousa@443: void *flow_control_analysis_c::visit(function_block_declaration_c *symbol) {
msousa@443: 	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@443: 	if (debug) printf("Doing flow control analysis in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value);
msousa@443: 	symbol->fblock_body->accept(*this);
msousa@443: 	delete search_varfb_instance_type;
msousa@443: 	search_varfb_instance_type = NULL;
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: /********************/
msousa@443: /* B 1.5.3 Programs */
msousa@443: /********************/
msousa@443: void *flow_control_analysis_c::visit(program_declaration_c *symbol) {
msousa@443: 	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
msousa@443: 	if (debug) printf("Doing flow control analysis in body of program %s\n", ((token_c *)(symbol->program_type_name))->value);
msousa@443: 	symbol->function_block_body->accept(*this);
msousa@443: 	delete search_varfb_instance_type;
msousa@443: 	search_varfb_instance_type = NULL;
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: 
msousa@443: /********************************/
msousa@443: /* B 1.7 Configuration elements */
msousa@443: /********************************/
msousa@443: void *flow_control_analysis_c::visit(configuration_declaration_c *symbol) {
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: 
msousa@443: /****************************************/
msousa@443: /* B.2 - Language IL (Instruction List) */
msousa@443: /****************************************/
msousa@443: /***********************************/
msousa@443: /* B 2.1 Instructions and Operands */
msousa@443: /***********************************/
msousa@443: 
msousa@443: /*| instruction_list il_instruction */
msousa@443: // SYM_LIST(instruction_list_c)
msousa@443: void *flow_control_analysis_c::visit(instruction_list_c *symbol) {
msousa@443: 	for(int i = 1; i < symbol->n; i++) {
msousa@443: 		prev_il_instruction = symbol->elements[i-1];
msousa@443: 		symbol->elements[i]->accept(*this);
msousa@443: 	}
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: /* | label ':' [il_incomplete_instruction] eol_list */
msousa@443: // SYM_REF2(il_instruction_c, label, il_instruction)
msousa@443: // void *visit(instruction_list_c *symbol);
msousa@443: void *flow_control_analysis_c::visit(il_instruction_c *symbol) {
msousa@443: 	symbol->prev_il_instruction = prev_il_instruction;
msousa@443: 	/* TODO: handle labels correctly!
msousa@443: 	 *
msousa@443: 	 *      Don't forget to handle multiple consecutive lables too!
msousa@443: 	 * 	  label2:
msousa@443: 	 *        label3:
msousa@443: 	 *        label4:
msousa@443: 	 *                LD I
msousa@443: 	 */
msousa@443: 
msousa@443: return NULL;
msousa@443: }
msousa@443: 
msousa@443: 
msousa@443: #if 0
msousa@443: /* | function_name [il_operand_list] */
msousa@443: /* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */
msousa@443: // SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;)
msousa@443: void *flow_control_analysis_c::visit(il_function_call_c *symbol) {
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: /* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
msousa@443: // SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list);
msousa@443: void *flow_control_analysis_c::visit(il_expression_c *symbol) {
msousa@443: return NULL;
msousa@443: }
msousa@443: 
msousa@443: /*   il_call_operator prev_declared_fb_name
msousa@443:  * | il_call_operator prev_declared_fb_name '(' ')'
msousa@443:  * | il_call_operator prev_declared_fb_name '(' eol_list ')'
msousa@443:  * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
msousa@443:  * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
msousa@443:  */
msousa@443: /* NOTE: The parameter 'called_fb_declaration'is used to pass data between stage 3 and stage4 (although currently it is not used in stage 4 */
msousa@443: // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
msousa@443: void *flow_control_analysis_c::visit(il_fb_call_c *symbol) {
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: 
msousa@443: /* | function_name '(' eol_list [il_param_list] ')' */
msousa@443: /* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */
msousa@443: // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;)
msousa@443: void *flow_control_analysis_c::visit(il_formal_funct_call_c *symbol) {
msousa@443: 	return NULL;
msousa@443: }
msousa@443: 
msousa@443: 
msousa@443: /*
msousa@443:     void *visit(il_operand_list_c *symbol);
msousa@443:     void *visit(simple_instr_list_c *symbol);
msousa@443:     void *visit(il_param_list_c *symbol);
msousa@443:     void *visit(il_param_assignment_c *symbol);
msousa@443:     void *visit(il_param_out_assignment_c *symbol);
msousa@443:  */
msousa@443: 
msousa@443: 
msousa@443: #endif
msousa@443: