--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/stage3/flow_control_analysis.cc Thu Feb 16 10:27:52 2012 +0000
@@ -0,0 +1,185 @@
+/*
+ * 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)
+ *
+ */
+
+
+/*
+ * Do flow control analysis of the IEC 61131-3 code.
+ *
+ * We currently only do this for IL code.
+ * This class will annotate the abstract syntax tree, by filling in the
+ * prev_il_instruction variable in the il_instruction_c, so it points to
+ * the previous il_instruction_c object in the instruction list instruction_list_c.
+ */
+
+#include "flow_control_analysis.hh"
+
+
+
+/* set to 1 to see debug info during execution */
+static int debug = 0;
+
+flow_control_analysis_c::flow_control_analysis_c(symbol_c *ignore) {
+}
+
+flow_control_analysis_c::~flow_control_analysis_c(void) {
+}
+
+
+
+/************************************/
+/* B 1.5 Program organization units */
+/************************************/
+/*********************/
+/* B 1.5.1 Functions */
+/*********************/
+void *flow_control_analysis_c::visit(function_declaration_c *symbol) {
+ search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
+ if (debug) printf("Doing flow control analysis in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value);
+ symbol->function_body->accept(*this);
+ delete search_varfb_instance_type;
+ search_varfb_instance_type = NULL;
+ return NULL;
+}
+
+/***************************/
+/* B 1.5.2 Function blocks */
+/***************************/
+void *flow_control_analysis_c::visit(function_block_declaration_c *symbol) {
+ search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
+ if (debug) printf("Doing flow control analysis in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value);
+ symbol->fblock_body->accept(*this);
+ delete search_varfb_instance_type;
+ search_varfb_instance_type = NULL;
+ return NULL;
+}
+
+/********************/
+/* B 1.5.3 Programs */
+/********************/
+void *flow_control_analysis_c::visit(program_declaration_c *symbol) {
+ search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
+ if (debug) printf("Doing flow control analysis in body of program %s\n", ((token_c *)(symbol->program_type_name))->value);
+ symbol->function_block_body->accept(*this);
+ delete search_varfb_instance_type;
+ search_varfb_instance_type = NULL;
+ return NULL;
+}
+
+
+/********************************/
+/* B 1.7 Configuration elements */
+/********************************/
+void *flow_control_analysis_c::visit(configuration_declaration_c *symbol) {
+ return NULL;
+}
+
+
+/****************************************/
+/* B.2 - Language IL (Instruction List) */
+/****************************************/
+/***********************************/
+/* B 2.1 Instructions and Operands */
+/***********************************/
+
+/*| instruction_list il_instruction */
+// SYM_LIST(instruction_list_c)
+void *flow_control_analysis_c::visit(instruction_list_c *symbol) {
+ for(int i = 1; i < symbol->n; i++) {
+ prev_il_instruction = symbol->elements[i-1];
+ symbol->elements[i]->accept(*this);
+ }
+ return NULL;
+}
+
+/* | label ':' [il_incomplete_instruction] eol_list */
+// SYM_REF2(il_instruction_c, label, il_instruction)
+// void *visit(instruction_list_c *symbol);
+void *flow_control_analysis_c::visit(il_instruction_c *symbol) {
+ symbol->prev_il_instruction = prev_il_instruction;
+ /* TODO: handle labels correctly!
+ *
+ * Don't forget to handle multiple consecutive lables too!
+ * label2:
+ * label3:
+ * label4:
+ * LD I
+ */
+
+return NULL;
+}
+
+
+#if 0
+/* | function_name [il_operand_list] */
+/* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */
+// SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;)
+void *flow_control_analysis_c::visit(il_function_call_c *symbol) {
+ return NULL;
+}
+
+/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
+// SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list);
+void *flow_control_analysis_c::visit(il_expression_c *symbol) {
+return NULL;
+}
+
+/* il_call_operator prev_declared_fb_name
+ * | il_call_operator prev_declared_fb_name '(' ')'
+ * | il_call_operator prev_declared_fb_name '(' eol_list ')'
+ * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
+ * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
+ */
+/* 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 */
+// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
+void *flow_control_analysis_c::visit(il_fb_call_c *symbol) {
+ return NULL;
+}
+
+
+/* | function_name '(' eol_list [il_param_list] ')' */
+/* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */
+// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;)
+void *flow_control_analysis_c::visit(il_formal_funct_call_c *symbol) {
+ return NULL;
+}
+
+
+/*
+ void *visit(il_operand_list_c *symbol);
+ void *visit(simple_instr_list_c *symbol);
+ void *visit(il_param_list_c *symbol);
+ void *visit(il_param_assignment_c *symbol);
+ void *visit(il_param_out_assignment_c *symbol);
+ */
+
+
+#endif
+