--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage3/lvalue_check.hh	Sat Apr 14 20:02:36 2012 +0200
@@ -0,0 +1,108 @@
+/*
+ *  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)
+ *
+ */
+
+#include <vector>
+#include "../absyntax_utils/absyntax_utils.hh"
+#include "datatype_functions.hh"
+
+/*
+ *  In this class we implemented all lvalue check.
+ *  With lvalue check we mean all semantic error about
+ *  assignment with wrong access
+ */
+
+class lvalue_check_c: public iterator_visitor_c {
+
+  private:
+	search_varfb_instance_type_c *search_varfb_instance_type;
+	search_var_instance_decl_c *search_var_instance_decl;
+    search_base_type_c search_base_type;
+    int error_found;
+    int current_display_error_level;
+    std::vector <symbol_c *> control_variables;
+    symbol_c *base_type(symbol_c *symbol);
+    void check_for_controlvar_assignment(symbolic_variable_c *lvalue);
+    void check_output_assignment(symbolic_variable_c *lvalue);
+    void check_constant_assignment(symbolic_variable_c *lvalue);
+    void check_function_call_parameter(function_invocation_c *f_call);
+
+
+  public:
+    lvalue_check_c(symbol_c *ignore);
+    virtual ~lvalue_check_c(void);
+    int get_error_found();
+
+    /**************************************/
+    /* B 1.5 - Program organisation units */
+    /**************************************/
+    /***********************/
+    /* B 1.5.1 - Functions */
+    /***********************/
+    void *visit(function_declaration_c *symbol);
+
+    /*****************************/
+    /* B 1.5.2 - Function blocks */
+    /*****************************/
+    void *visit(function_block_declaration_c *symbol);
+
+    /**********************/
+    /* B 1.5.3 - Programs */
+    /**********************/
+    void *visit(program_declaration_c *symbol);
+
+    /***************************************/
+    /* B.3 - Language ST (Structured Text) */
+    /***************************************/
+    /***********************/
+    /* B 3.1 - Expressions */
+    /***********************/
+    void *visit(function_invocation_c *symbol);
+
+    /*********************************/
+    /* B 3.2.1 Assignment Statements */
+    /*********************************/
+    void *visit(assignment_statement_c *symbol);
+
+    /********************************/
+    /* B 3.2.4 Iteration Statements */
+    /********************************/
+    void *visit(for_statement_c *symbol);
+
+}; /* lvalue_check_c */
+
+
+
+
+
+
+