stage3/range_check.cc
changeset 559 a3b8925e640c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage3/range_check.cc	Tue May 15 18:59:32 2012 +0200
@@ -0,0 +1,175 @@
+/*
+ *  matiec - a compiler for the programming languages defined in IEC 61131-3
+ *
+ *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)
+ *  Copyright (C) 2012       Manuele Conti  (conti.ma@alice.it)
+ *
+ *
+ *  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)
+ *
+ */
+
+
+/*
+ * TODO:
+ *   - Check subscript values fall within allowed range.
+ *     For the checking of subscript values to work correctly, we would need to have constant folding working too:
+ *     array_var[8 + 99] can not be checked without constant folding.
+ *     However, even without constant folding range check may be usefull,
+ *     and later changing it to use the values coming out of constant folding should not be very difficult.
+ *
+ */
+
+
+#include "range_check.hh"
+
+#define FIRST_(symbol1, symbol2) (((symbol1)->first_order < (symbol2)->first_order)   ? (symbol1) : (symbol2))
+#define  LAST_(symbol1, symbol2) (((symbol1)->last_order  > (symbol2)->last_order)    ? (symbol1) : (symbol2))
+
+#define STAGE3_ERROR(error_level, symbol1, symbol2, ...) {                                                                  \
+  if (current_display_error_level >= error_level) {                                                                         \
+    fprintf(stderr, "%s:%d-%d..%d-%d: error: ",                                                                             \
+            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\
+                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\
+    fprintf(stderr, __VA_ARGS__);                                                                                           \
+    fprintf(stderr, "\n");                                                                                                  \
+    error_count++;                                                                                                     \
+  }                                                                                                                         \
+}
+
+
+#define STAGE3_WARNING(symbol1, symbol2, ...) {                                                                             \
+    fprintf(stderr, "%s:%d-%d..%d-%d: warning: ",                                                                           \
+            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\
+                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\
+    fprintf(stderr, __VA_ARGS__);                                                                                           \
+    fprintf(stderr, "\n");                                                                                                  \
+    warning_found = true;                                                                                                   \
+}
+
+
+range_check_c::range_check_c(symbol_c *ignore) {
+	error_count = 0;
+	current_display_error_level = 0;
+}
+
+range_check_c::~range_check_c(void) {
+}
+
+int range_check_c::get_error_count() {
+	return error_count;
+}
+
+void range_check_c::check_range_array_check(array_variable_c *symbol) {
+	int dimension_count;
+	symbol_c* dimension;
+	var_declarations_c *var_decl;
+	array_dimension_iterator_c* array_dimension_iterator;
+
+	var_decl = (var_declarations_c *)search_varfb_instance_type->get_basetype_decl(symbol->subscripted_variable);
+	array_dimension_iterator = new array_dimension_iterator_c(var_decl);
+	for (dimension_count = 0; NULL != array_dimension_iterator->next(); dimension_count++);
+	if (dimension_count != ((list_c *)symbol->subscript_list)->n)
+		STAGE3_ERROR(0, symbol, symbol, "Number of dimensions does not match, Array have %d dimension(s)", dimension_count);
+}
+
+/*********************/
+/* B 1.4 - Variables */
+/*********************/
+/*************************************/
+/* B 1.4.2 - Multi-element variables */
+/*************************************/
+void *range_check_c::visit(array_variable_c *symbol) {
+	check_range_array_check(symbol);
+	return NULL;
+}
+
+
+/**************************************/
+/* B 1.5 - Program organisation units */
+/**************************************/
+/***********************/
+/* B 1.5.1 - Functions */
+/***********************/
+void *range_check_c::visit(function_declaration_c *symbol) {
+	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
+	search_var_instance_decl = new search_var_instance_decl_c(symbol);
+	symbol->function_body->accept(*this);
+	delete search_varfb_instance_type;
+	delete search_var_instance_decl;
+	search_varfb_instance_type = NULL;
+	search_var_instance_decl = NULL;
+	return NULL;
+}
+
+/*****************************/
+/* B 1.5.2 - Function blocks */
+/*****************************/
+void *range_check_c::visit(function_block_declaration_c *symbol) {
+	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
+	search_var_instance_decl = new search_var_instance_decl_c(symbol);
+	symbol->fblock_body->accept(*this);
+	delete search_varfb_instance_type;
+	delete search_var_instance_decl;
+	search_varfb_instance_type = NULL;
+	search_var_instance_decl = NULL;
+	return NULL;
+}
+
+/**********************/
+/* B 1.5.3 - Programs */
+/**********************/
+void *range_check_c::visit(program_declaration_c *symbol) {
+	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
+	search_var_instance_decl = new search_var_instance_decl_c(symbol);
+	symbol->function_block_body->accept(*this);
+	delete search_varfb_instance_type;
+	delete search_var_instance_decl;
+	search_varfb_instance_type = NULL;
+	search_var_instance_decl = NULL;
+	return NULL;
+}
+
+
+
+/***************************************/
+/* B.3 - Language ST (Structured Text) */
+/***************************************/
+/*********************************/
+/* B 3.2.1 Assignment Statements */
+/*********************************/
+void *range_check_c::visit(assignment_statement_c *symbol) {
+	symbol->l_exp->accept(*this);
+    symbol->r_exp->accept(*this);
+	return NULL;
+}
+
+
+
+
+
+
+
+