conti@508: /*
conti@508:  *  matiec - a compiler for the programming languages defined in IEC 61131-3
conti@508:  *
conti@508:  *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)
conti@508:  *  Copyright (C) 2012       Manuele Conti  (conti.ma@alice.it)
conti@508:  *
conti@508:  *
conti@508:  *  This program is free software: you can redistribute it and/or modify
conti@508:  *  it under the terms of the GNU General Public License as published by
conti@508:  *  the Free Software Foundation, either version 3 of the License, or
conti@508:  *  (at your option) any later version.
conti@508:  *
conti@508:  *  This program is distributed in the hope that it will be useful,
conti@508:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
conti@508:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
conti@508:  *  GNU General Public License for more details.
conti@508:  *
conti@508:  *  You should have received a copy of the GNU General Public License
conti@508:  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
conti@508:  *
conti@508:  *
conti@508:  * This code is made available on the understanding that it will not be
conti@508:  * used in safety-critical situations without a full and competent review.
conti@508:  */
conti@508: 
conti@508: /*
conti@508:  * An IEC 61131-3 compiler.
conti@508:  *
conti@508:  * Based on the
conti@508:  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
conti@508:  *
conti@508:  */
conti@508: 
conti@508: #include <vector>
conti@508: #include "../absyntax_utils/absyntax_utils.hh"
conti@508: #include "datatype_functions.hh"
conti@508: 
conti@508: /*
conti@508:  *  In this class we implemented all lvalue check.
conti@508:  *  With lvalue check we mean all semantic error about
conti@508:  *  assignment with wrong access
conti@508:  */
conti@508: 
conti@508: class lvalue_check_c: public iterator_visitor_c {
conti@508: 
conti@508:   private:
msousa@509:     search_varfb_instance_type_c *search_varfb_instance_type;
msousa@509:     search_var_instance_decl_c *search_var_instance_decl;
conti@508:     search_base_type_c search_base_type;
msousa@510:     int error_count;
conti@508:     int current_display_error_level;
msousa@512:     std::vector <token_c *> control_variables;
msousa@528:     symbol_c *current_il_operand;
msousa@509: 
msousa@509:     void verify_is_lvalue              (symbol_c *lvalue);
msousa@509:     void check_assignment_to_controlvar(symbol_c *lvalue);
msousa@509:     void check_assignment_to_output    (symbol_c *lvalue);
msousa@509:     void check_assignment_to_constant  (symbol_c *lvalue);
msousa@509:     void check_assignment_to_expression(symbol_c *lvalue);
msousa@509:     void check_formal_call   (symbol_c *f_call, symbol_c *f_decl);
msousa@509:     void check_nonformal_call(symbol_c *f_call, symbol_c *f_decl);
conti@508: 
conti@508: 
conti@508:   public:
conti@508:     lvalue_check_c(symbol_c *ignore);
conti@508:     virtual ~lvalue_check_c(void);
msousa@510:     int get_error_count();
conti@508: 
conti@508:     /**************************************/
conti@508:     /* B 1.5 - Program organisation units */
conti@508:     /**************************************/
conti@508:     /***********************/
conti@508:     /* B 1.5.1 - Functions */
conti@508:     /***********************/
conti@508:     void *visit(function_declaration_c *symbol);
conti@508: 
conti@508:     /*****************************/
conti@508:     /* B 1.5.2 - Function blocks */
conti@508:     /*****************************/
conti@508:     void *visit(function_block_declaration_c *symbol);
conti@508: 
conti@508:     /**********************/
conti@508:     /* B 1.5.3 - Programs */
conti@508:     /**********************/
conti@508:     void *visit(program_declaration_c *symbol);
conti@508: 
conti@527:     /****************************************/
conti@527:     /* B.2 - Language IL (Instruction List) */
conti@527:     /****************************************/
conti@527:     /***********************************/
conti@527:     /* B 2.1 Instructions and Operands */
conti@527:     /***********************************/
conti@527:     void *visit(il_instruction_c *symbol);
conti@527:     void *visit(il_simple_operation_c *symbol);
msousa@535:     void *visit(il_function_call_c *symbol);
msousa@535:     void *visit(il_fb_call_c *symbol);
msousa@535:     void *visit(il_formal_funct_call_c *symbol);
conti@527: 
conti@527:     /*******************/
conti@527:     /* B 2.2 Operators */
conti@527:     /*******************/
conti@527:     void *visit(ST_operator_c *symbol);
conti@527:     void *visit(STN_operator_c *symbol);
conti@527:     void *visit(S_operator_c *symbol);
conti@527:     void *visit(R_operator_c *symbol);
conti@527: 
conti@508:     /***************************************/
conti@508:     /* B.3 - Language ST (Structured Text) */
conti@508:     /***************************************/
conti@508:     /***********************/
conti@508:     /* B 3.1 - Expressions */
conti@508:     /***********************/
conti@508:     void *visit(function_invocation_c *symbol);
conti@508: 
conti@508:     /*********************************/
conti@508:     /* B 3.2.1 Assignment Statements */
conti@508:     /*********************************/
conti@508:     void *visit(assignment_statement_c *symbol);
conti@508: 
conti@526:     /*****************************************/
conti@526:     /* B 3.2.2 Subprogram Control Statements */
conti@526:     /*****************************************/
conti@526:     void *visit(fb_invocation_c *symbol);
conti@526: 
conti@508:     /********************************/
conti@508:     /* B 3.2.4 Iteration Statements */
conti@508:     /********************************/
conti@508:     void *visit(for_statement_c *symbol);
conti@508: 
conti@508: }; /* lvalue_check_c */
conti@508: 
conti@508: 
conti@508: 
conti@508: 
conti@508: 
conti@508: 
conti@508: