1 /*

     2  *  matiec - a compiler for the programming languages defined in IEC 61131-3

     3  *

     4  *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)

     5  *  Copyright (C) 2012       Manuele Conti (manuele.conti@sirius-es.it)

     6  *  Copyright (C) 2012       Matteo Facchinetti (matteo.facchinetti@sirius-es.it)

     7  *

     8  *

     9  *  This program is free software: you can redistribute it and/or modify

    10  *  it under the terms of the GNU General Public License as published by

    11  *  the Free Software Foundation, either version 3 of the License, or

    12  *  (at your option) any later version.

    13  *

    14  *  This program is distributed in the hope that it will be useful,

    15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    17  *  GNU General Public License for more details.

    18  *

    19  *  You should have received a copy of the GNU General Public License

    20  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

    21  *

    22  *

    23  * This code is made available on the understanding that it will not be

    24  * used in safety-critical situations without a full and competent review.

    25  */

    26 

    27 /*

    28  * An IEC 61131-3 compiler.

    29  *

    30  * Based on the

    31  * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

    32  *

    33  */

    34 

    35 

    36 #include "../absyntax_utils/absyntax_utils.hh"

    37 

    38 class narrow_candidate_datatypes_c: public iterator_visitor_c {

    39 

    40   private:

    41     symbol_c * selected_datatype;

    42     search_varfb_instance_type_c *search_varfb_instance_type;

    43     search_base_type_c search_base_type;

    44     symbol_c *case_expression_type;

    45     symbol_c *il_operand;

    46     symbol_c *prev_il_instruction;

    47 

    48     bool is_widening_compatible(symbol_c *left_type, symbol_c *right_type, symbol_c *result_type, const struct widen_entry widen_table[]);

    49 

    50   public:

    51     narrow_candidate_datatypes_c(symbol_c *ignore);

    52     virtual ~narrow_candidate_datatypes_c(void);

    53     void narrow_nonformal_call(symbol_c *f_call, symbol_c *f_decl);

    54     void narrow_formal_call(symbol_c *f_call, symbol_c *f_decl);

    55 

    56     symbol_c *base_type(symbol_c *symbol);

    57 

    58     /**********************/

    59     /* B 1.3 - Data types */

    60     /**********************/

    61     /********************************/

    62     /* B 1.3.3 - Derived data types */

    63     /********************************/

    64     void *visit(subrange_c *symbol);

    65 

    66     /*********************/

    67     /* B 1.4 - Variables */

    68     /*********************/

    69     /********************************************/

    70     /* B 1.4.1 - Directly Represented Variables */

    71     /********************************************/

    72     /*************************************/

    73     /* B 1.4.2 - Multi-element variables */

    74     /*************************************/

    75     void *visit(array_variable_c *symbol);

    76     void *visit(subscript_list_c *symbol);

    77 

    78     /**************************************/

    79     /* B 1.5 - Program organization units */

    80     /**************************************/

    81     /***********************/

    82     /* B 1.5.1 - Functions */

    83     /***********************/

    84     void *visit(function_declaration_c *symbol);

    85 

    86     /*****************************/

    87     /* B 1.5.2 - Function blocks */

    88     /*****************************/

    89     void *visit(function_block_declaration_c *symbol);

    90 

    91     /**********************/

    92     /* B 1.5.3 - Programs */

    93     /**********************/

    94     void *visit(program_declaration_c *symbol);

    95 

    96     /********************************/

    97     /* B 1.7 Configuration elements */

    98     /********************************/

    99     void *visit(configuration_declaration_c *symbol);

   100     /****************************************/

   101     /* B.2 - Language IL (Instruction List) */

   102     /****************************************/

   103     /***********************************/

   104     /* B 2.1 Instructions and Operands */

   105     /***********************************/

   106     // void *visit(instruction_list_c *symbol);

   107     void *visit(il_simple_operation_c *symbol);

   108     void *visit(il_function_call_c *symbol);

   109     void *visit(il_expression_c *symbol);

   110     void *visit(il_fb_call_c *symbol);

   111     void *visit(il_formal_funct_call_c *symbol);

   112     /*

   113         void *visit(il_operand_list_c *symbol);

   114         void *visit(simple_instr_list_c *symbol);

   115         void *visit(il_param_list_c *symbol);

   116         void *visit(il_param_assignment_c *symbol);

   117         void *visit(il_param_out_assignment_c *symbol);

   118      */

   119 

   120     /*******************/

   121     /* B 2.2 Operators */

   122     /*******************/

   123     void *visit(LD_operator_c *symbol);

   124     void *visit(LDN_operator_c *symbol);

   125     void *visit(ST_operator_c *symbol);

   126     void *visit(STN_operator_c *symbol);

   127     void *visit(NOT_operator_c *symbol);

   128     void *visit(S_operator_c *symbol);

   129     void *visit(R_operator_c *symbol);

   130     void *visit(S1_operator_c *symbol);

   131     void *visit(R1_operator_c *symbol);

   132     void *visit(CLK_operator_c *symbol);

   133     void *visit(CU_operator_c *symbol);

   134     void *visit(CD_operator_c *symbol);

   135     void *visit(PV_operator_c *symbol);

   136     void *visit(IN_operator_c *symbol);

   137     void *visit(PT_operator_c *symbol);

   138     void *visit(AND_operator_c *symbol);

   139     void *visit(OR_operator_c *symbol);

   140     void *visit(XOR_operator_c *symbol);

   141     void *visit(ANDN_operator_c *symbol);

   142     void *visit(ORN_operator_c *symbol);

   143     void *visit(XORN_operator_c *symbol);

   144     void *visit(ADD_operator_c *symbol);

   145     void *visit(SUB_operator_c *symbol);

   146     void *visit(MUL_operator_c *symbol);

   147     void *visit(DIV_operator_c *symbol);

   148     void *visit(MOD_operator_c *symbol);

   149     void *visit(GT_operator_c *symbol);

   150     void *visit(GE_operator_c *symbol);

   151     void *visit(EQ_operator_c *symbol);

   152     void *visit(LT_operator_c *symbol);

   153     void *visit(LE_operator_c *symbol);

   154     void *visit(NE_operator_c *symbol);

   155     void *visit(CAL_operator_c *symbol);

   156     void *visit(CALC_operator_c *symbol);

   157     void *visit(CALCN_operator_c *symbol);

   158     void *visit(RET_operator_c *symbol);

   159     void *visit(RETC_operator_c *symbol);

   160     void *visit(RETCN_operator_c *symbol);

   161     void *visit(JMP_operator_c *symbol);

   162     void *visit(JMPC_operator_c *symbol);

   163     void *visit(JMPCN_operator_c *symbol);

   164     /* Symbol class handled together with function call checks */

   165     // void *visit(il_assign_operator_c *symbol, variable_name);

   166     /* Symbol class handled together with function call checks */

   167     // void *visit(il_assign_operator_c *symbol, option, variable_name);

   168     /***************************************/

   169     /* B.3 - Language ST (Structured Text) */

   170     /***************************************/

   171     /***********************/

   172     /* B 3.1 - Expressions */

   173     /***********************/

   174     void *visit(or_expression_c *symbol);

   175     void *visit(xor_expression_c *symbol);

   176     void *visit(and_expression_c *symbol);

   177     void *visit(equ_expression_c *symbol);

   178     void *visit(notequ_expression_c *symbol);

   179     void *visit(lt_expression_c *symbol);

   180     void *visit(gt_expression_c *symbol);

   181     void *visit(le_expression_c *symbol);

   182     void *visit(ge_expression_c *symbol);

   183     void *visit(add_expression_c *symbol);

   184     void *visit(sub_expression_c *symbol);

   185     void *visit(mul_expression_c *symbol);

   186     void *visit(div_expression_c *symbol);

   187     void *visit(mod_expression_c *symbol);

   188     void *visit(power_expression_c *symbol);

   189     void *visit(neg_expression_c *symbol);

   190     void *visit(not_expression_c *symbol);

   191 

   192     void *visit(function_invocation_c *symbol);

   193 

   194     /*********************************/

   195     /* B 3.2.1 Assignment Statements */

   196     /*********************************/

   197     void *visit(assignment_statement_c *symbol);

   198 

   199     /********************************/

   200     /* B 3.2.3 Selection Statements */

   201     /********************************/

   202     void *visit(if_statement_c *symbol);

   203     void *visit(elseif_statement_c *symbol);

   204     void *visit(case_statement_c *symbol);

   205     void *visit(case_element_list_c *symbol);

   206     void *visit(case_element_c *symbol);

   207     void *visit(case_list_c *symbol);

   208 

   209     /********************************/

   210     /* B 3.2.4 Iteration Statements */

   211     /********************************/

   212     void *visit(for_statement_c *symbol);

   213     void *visit(while_statement_c *symbol);

   214     void *visit(repeat_statement_c *symbol);

   215 

   216 }; // narrow_candidate_datatypes_c

   217 

   218 

   219 

   220 

   221 

   222 

   223 

   224