--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/stage3/array_range_check.cc Tue May 15 23:03:25 2012 +0100
@@ -0,0 +1,154 @@
+/*
+ * 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 "array_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; \
+}
+
+
+array_range_check_c::array_range_check_c(symbol_c *ignore) {
+ error_count = 0;
+ current_display_error_level = 0;
+}
+
+array_range_check_c::~array_range_check_c(void) {
+}
+
+int array_range_check_c::get_error_count() {
+ return error_count;
+}
+
+void array_range_check_c::check_dimension_count(array_variable_c *symbol) {
+ int dimension_count;
+ symbol_c *var_decl;
+
+ var_decl = search_varfb_instance_type->get_basetype_decl(symbol->subscripted_variable);
+ array_dimension_iterator_c array_dimension_iterator(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 *array_range_check_c::visit(array_variable_c *symbol) {
+ check_dimension_count(symbol);
+ return NULL;
+}
+
+
+/**************************************/
+/* B 1.5 - Program organisation units */
+/**************************************/
+/***********************/
+/* B 1.5.1 - Functions */
+/***********************/
+void *array_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 *array_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 *array_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;
+}
+
+
+