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/*

     2

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

     3

 *

     4

 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)

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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant

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 *

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

     8

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

     9

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

    10

 *  (at your option) any later version.

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 *

    12

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

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

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *  GNU General Public License for more details.

    16

 *

    17

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

    18

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

    19

 *

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 *

    21

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

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

    23

 */

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#include <string>

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#include <iostream>

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#include <sstream>

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#include <typeinfo>

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#include <list>

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#include <map>

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#include <sstream>

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#include <strings.h>

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#include "../../util/symtable.hh"

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#include "../../util/dsymtable.hh"

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#include "../../absyntax/visitor.hh"

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

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#include "../../main.hh" // required for ERROR() and ERROR_MSG() macros.

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#include "../stage4.hh"

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//#define DEBUG

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#ifdef DEBUG

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#define TRACE(classname) printf("\n____%s____\n",classname);

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#else

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#define TRACE(classname)

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#endif

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#define STAGE4_ERROR(symbol1, symbol2, ...) {stage4err("while generating C code", symbol1, symbol2, __VA_ARGS__); exit(EXIT_FAILURE);}

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/* Macros to access the constant value of each expression (if it exists) from the annotation introduced to the symbol_c object by constant_folding_c in stage3! */

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#define VALID_CVALUE(dtype, symbol)           (symbol_c::cs_const_value == (symbol)->const_value._##dtype.status)

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#define GET_CVALUE(dtype, symbol)             ((symbol)->const_value._##dtype.value) 

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/***********************************************************************/

    62

    63

/* Unlike Programs and Configurations which get mapped onto C++ classes,

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 * Function Blocks are mapped onto a C structure containing the variables, and

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 * a C function containing the code in the FB's body. This is to allow direct allocation

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 * of a FB variable (which is really an instance of the C data structure) to

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 * a member of a union variable (note that classes with constructors cannot

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 * be mebers of a union), which is done in IL when loading a FB onto IL's

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 * default variable.

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 *

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 * So as not to clash the names of the C data structure and the C function,

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 * the C structure is given a name identical to that of the FB name, whereas

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 * the name of the function is the FB name with a constant string appended.

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 * The value of that constant string which is appended is defined in the following

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 * constant.

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 * In order not to clash with any variable in the IL and ST source codem the

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 * following constant should contain a double underscore, which is not allowed

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 * in IL and ST.

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 *

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 * e.g.:  FUNTION_BLOCK TEST

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 * is mapped onto a TEST data structure, and a TEST_body__ function.

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 */

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#define FB_FUNCTION_SUFFIX "_body__"

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/* Idem as body, but for initializer FB function */

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#define FB_INIT_SUFFIX "_init__"

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/* Idem as body, but for run CONFIG and RESOURCE function */

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#define FB_RUN_SUFFIX "_run__"

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/* The FB body function is passed as the only parameter a pointer to the FB data

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 * structure instance. The name of this parameter is given by the following constant.

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 * In order not to clash with any variable in the IL and ST source codem the

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 * following constant should contain a double underscore, which is not allowed

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 * in IL and ST.

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 *

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 * e.g.: the body of FUNTION_BLOCK TEST

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 * is mapped onto the C function

   100

 *  TEST_body__(TEST *data__)

   101

 */

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#define FB_FUNCTION_PARAM "data__"

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#define SFC_STEP_ACTION_PREFIX "__SFC_"

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/* Variable declaration symbol for accessor macros */

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#define DECLARE_VAR "__DECLARE_VAR"

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#define DECLARE_GLOBAL "__DECLARE_GLOBAL"

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#define DECLARE_GLOBAL_FB "__DECLARE_GLOBAL_FB"

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#define DECLARE_GLOBAL_LOCATION "__DECLARE_GLOBAL_LOCATION"

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#define DECLARE_GLOBAL_LOCATED "__DECLARE_GLOBAL_LOCATED"

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#define DECLARE_EXTERNAL "__DECLARE_EXTERNAL"

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#define DECLARE_EXTERNAL_FB "__DECLARE_EXTERNAL_FB"

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#define DECLARE_LOCATED "__DECLARE_LOCATED"

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#define DECLARE_GLOBAL_PROTOTYPE "__DECLARE_GLOBAL_PROTOTYPE"

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/* Variable declaration symbol for accessor macros */

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#define INIT_VAR "__INIT_VAR"

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#define INIT_GLOBAL "__INIT_GLOBAL"

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#define INIT_GLOBAL_FB "__INIT_GLOBAL_FB"

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#define INIT_GLOBAL_LOCATED "__INIT_GLOBAL_LOCATED"

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#define INIT_EXTERNAL "__INIT_EXTERNAL"

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#define INIT_EXTERNAL_FB "__INIT_EXTERNAL_FB"

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#define INIT_LOCATED "__INIT_LOCATED"

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#define INIT_LOCATED_VALUE "__INIT_LOCATED_VALUE"

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/* Variable getter symbol for accessor macros */

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#define GET_VAR "__GET_VAR"

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#define GET_EXTERNAL "__GET_EXTERNAL"

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#define GET_EXTERNAL_FB "__GET_EXTERNAL_FB"

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#define GET_LOCATED "__GET_LOCATED"

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#define GET_VAR_BY_REF "__GET_VAR_BY_REF"

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#define GET_EXTERNAL_BY_REF "__GET_EXTERNAL_BY_REF"

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#define GET_EXTERNAL_FB_BY_REF "__GET_EXTERNAL_FB_BY_REF"

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#define GET_LOCATED_BY_REF "__GET_LOCATED_BY_REF"

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/* Variable setter symbol for accessor macros */

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#define SET_VAR "__SET_VAR"

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#define SET_EXTERNAL "__SET_EXTERNAL"

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#define SET_EXTERNAL_FB "__SET_EXTERNAL_FB"

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#define SET_LOCATED "__SET_LOCATED"

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/* Variable initial value symbol for accessor macros */

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#define INITIAL_VALUE "__INITIAL_VALUE"

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/* Generate a name for a temporary variable.

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 * Each new name generated is appended a different number,

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 * starting off from 0.

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 * After calling reset(), the names will start off again from 0.

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 */

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#define VAR_LEADER "__"

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#define TEMP_VAR VAR_LEADER "TMP_"

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#define SOURCE_VAR VAR_LEADER "SRC_"

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/* please see the comment before the RET_operator_c visitor for details... */

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#define END_LABEL VAR_LEADER "end"

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

   165

/***********************************************************************/

   166

   167

#include "generate_c_base.cc"

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#include "generate_c_typedecl.cc"

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#include "generate_c_sfcdecl.cc"

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#include "generate_c_vardecl.cc"

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#include "generate_c_configbody.cc"

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#include "generate_location_list.cc"

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#include "generate_var_list.cc"

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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#include "generate_c.hh"

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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/***********************************************************************/

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/* A helper class that prints out the identifiers for function calls to overloaded functions */

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/* Given a function declaration of the function being called, it 

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 * will simply print out the returned data type,

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 * followed by the data types of all input, output, and in_out parameters.

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 *   for e.g.; 

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 *     SIN( REAL) : REAL      -> prints out ->  REAL__REAL

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 *     LEN( STRING) : INT     -> prints out ->  INT__STRING

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 *     MUL(TIME, INT) : TIME  -> prints out ->  TIME__TIME__INT

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 */

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class print_function_parameter_data_types_c: public generate_c_base_c {

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  private:

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    symbol_c *current_type;

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    bool_type_name_c tmp_bool;

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   203

    void print_list(symbol_c *var_list, symbol_c *data_type) { 

   204

      if (data_type != NULL) {

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        /* print out the data type once for every variable! */

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        list_c *list = dynamic_cast<list_c *>(var_list);

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        if (list == NULL) ERROR;  

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        for (int i=0; i < list->n; i++) {

   209

          s4o.print("__");

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          data_type->accept(*this);

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        }  

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      }

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    }

   214

   215

  public:

   216

    print_function_parameter_data_types_c(stage4out_c *s4o_ptr): 

   217

      generate_c_base_c(s4o_ptr)

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      {current_type = NULL;}

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   220

    /**************************************/

   221

    /* B.1.5 - Program organization units */

   222

    /**************************************/

   223

    /***********************/

   224

    /* B 1.5.1 - Functions */

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    /***********************/

   226

    /*   FUNCTION derived_function_name ':' elementary_type_name io_OR_function_var_declarations_list function_body END_FUNCTION */

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    /* | FUNCTION derived_function_name ':' derived_type_name io_OR_function_var_declarations_list function_body END_FUNCTION */

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    void *visit(function_declaration_c *symbol) {

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      symbol->type_name->accept(*this); /* return type */

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      symbol->var_declarations_list->accept(*this);

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      return NULL;

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    }

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    /* already handled by iterator base class (note that generate_c_base_c inherits from iterator_c) */

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    //void *visit(var_declarations_list_c *symbol) {// iterate through list}

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    /* already handled by iterator base class (note that generate_c_base_c inherits from iterator_c) */

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    //void *visit(input_declarations_c *symbol) {// iterate through list}

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   240

    /* already handled by iterator base class (note that generate_c_base_c inherits from iterator_c) */

   241

    //void *visit(input_declaration_list_c *symbol) {// iterate through list}

   242

   243

    void *visit(edge_declaration_c *symbol) {

   244

      current_type = &tmp_bool; 

   245

      symbol->var1_list->accept(*this);

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      current_type = NULL; 

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      return NULL;

   248

    }

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   250

    /* We do NOT print out EN and ENO parameters! */

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    void *visit(en_param_declaration_c *symbol) {return NULL;}

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    /* already handled by iterator base class (note that generate_c_base_c inherits from iterator_c) */

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    //void *visit(output_declarations_c *symbol) {// iterate through list}    

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    /* already handled by iterator base class (note that generate_c_base_c inherits from iterator_c) */

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    //void *visit(var_init_decl_list_c *symbol) {// iterate through list}

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   259

    void *visit(simple_spec_init_c *symbol) {

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      /* return the data type */

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      return symbol->simple_specification; 

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    }

   263

   264

    /* currently we do not support data types defined in the declaration itself */

   265

    /* For now, sugest the user define a TYPE .. END_TYPE */

   266

    /* NOTE: although this class may also sometimes point to a previously_declared_subrange_type_name

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     * we don't need this for now, so it is easier to just skip it allocation

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     */

   269

    void *visit(subrange_spec_init_c *symbol) {return NULL;}

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    /* currently we do not support data types defined in the declaration itself */

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    /* For now, sugest the user define a TYPE .. END_TYPE */

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    /* NOTE: although this class may also sometimes point to a previously_declared_enumerated_type_name

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     * we don't need this for now, so it is easier to just skip it allocation

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     */

   276

    void *visit(enumerated_spec_init_c *symbol) {return NULL;}

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    /* currently we do not support data types defined in the declaration itself */

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    /* For now, sugest the user define a TYPE .. END_TYPE */

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    /* NOTE: although this class may also sometimes point to a previously_declared_array_type_name

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     * we don't need this for now, so it is easier to just skip it allocation

   282

     */

   283

    void *visit(array_var_init_decl_c *symbol) {return NULL;}

   284

   285

    /* currently we do not support data types defined in the declaration itself */

   286

    /* For now, sugest the user define a TYPE .. END_TYPE */

   287

    /* NOTE: although this class may also sometimes point to a previously_declared_structured_type_name

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     * we don't need this for now, so it is easier to just skip it allocation

   289

     */

   290

    void *visit(structured_var_init_decl_c *symbol) {return NULL;}

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    /* We do NOT print out EN and ENO parameters! */

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    void *visit(eno_param_declaration_c *symbol) {return NULL;}

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   295

    /* already handled by iterator base class (note that generate_c_base_c inherits from iterator_c) */

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    //void *visit(input_output_declarations_c *symbol) {// iterate through list}    

   297

   298

    /* already handled by iterator base class (note that generate_c_base_c inherits from iterator_c) */

   299

    //void *visit(var_declaration_list_c *symbol) {iterate through list}

   300

   301

    void *visit(fb_name_decl_c *symbol) {

   302

      print_list(symbol->fb_name_list, spec_init_sperator_c::get_spec(symbol->fb_spec_init)); 

   303

      return NULL;

   304

    }

   305

   306

    void *visit(var1_init_decl_c *symbol) {

   307

      print_list(symbol->var1_list, (symbol_c *)symbol->spec_init->accept(*this));

   308

      return NULL;

   309

    }

   310

   311

    /* currently we do not support data types defined in the declaration itself */

   312

    /* For now, sugest the user define a TYPE .. END_TYPE */

   313

    void *visit(array_var_declaration_c *symbol) {return NULL;}

   314

   315

    void *visit(structured_var_declaration_c *symbol) {

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      current_type = symbol->structure_type_name; 

   317

      symbol->var1_list->accept(*this);

   318

      current_type = NULL; 

   319

      return NULL;

   320

    }

   321

   322

    /* currently we do not support data types defined in the declaration itself */

   323

    /* For now, sugest the user define a TYPE .. END_TYPE */

   324

    /* Note that this class is used for fixed length strings...

   325

     *   STRING [ 42 ]

   326

     */

   327

    void *visit(single_byte_string_var_declaration_c *symbol) {return NULL;}

   328

   329

    /* currently we do not support data types defined in the declaration itself */

   330

    /* For now, sugest the user define a TYPE .. END_TYPE */

   331

    /* Note that this class is used for fixed length strings...

   332

     *   WSTRING [ 42 ]

   333

     */

   334

    void *visit(double_byte_string_var_declaration_c *symbol) {return NULL;}

   335

};

   336

   337

   338

/***********************************************************************/

   339

/***********************************************************************/

   340

/***********************************************************************/

   341

/***********************************************************************/

   342

   343

/* A helper class that analyses if the datatype of a variable is 'complex'. */

   344

/* 'complex' means that it is either a strcuture or an array!               */

   345

class analyse_variable_c: public search_visitor_c {

   346

  private:

   347

    static analyse_variable_c *singleton_;

   348

   349

  public:

   350

    analyse_variable_c(void) {};

   351

   352

    static bool is_complex_type(symbol_c *symbol) {

   353

      if (NULL == symbol) ERROR;

   355

      return (   get_datatype_info_c::is_structure(symbol->datatype) 

   356

              || get_datatype_info_c::is_array    (symbol->datatype) 

   357

             );

   358

    }

   359

   360

   361

  private:

   362

    symbol_c *last_fb, *first_non_fb_identifier;

   363

   364

  public:  

   365

    /* returns the first element (from left to right) in a structured variable that is not a FB, i.e. is either a structure or an array! */

   366

    /* eg:

   367

     *      fb1.fb2.fb3.real       returns ??????

   368

     *      fb1.fb2.struct1.real   returns struct1

   369

     *      struct1.real           returns struct1

   370

     */

   371

    static symbol_c *find_first_nonfb(symbol_c *symbol) {

   372

      if (NULL == singleton_)       singleton_ = new analyse_variable_c();

   373

      if (NULL == singleton_)       ERROR;

   374

      if (NULL == symbol)           ERROR;

   375

   376

      singleton_->last_fb                 = NULL;

   377

      singleton_->first_non_fb_identifier = NULL;

   378

      return (symbol_c *)symbol->accept(*singleton_);

   379

    }

   380

   381

    /* returns true if a strcutured variable (e.g. fb1.fb2.strcut1.real) contains a structure or array */

   382

    /* eg:

   383

     *      fb1.fb2.fb3.real       returns FALSE

   384

     *      fb1.fb2.struct1.real   returns TRUE

   385

     *      struct1.real           returns TRUE

   386

     */

   387

    static bool contains_complex_type(symbol_c *symbol) {

   388

      if (NULL == symbol) ERROR;

   389

      if (!get_datatype_info_c::is_type_valid(symbol->datatype)) ERROR;

   390

   391

      symbol_c *first_non_fb = (symbol_c *)find_first_nonfb(symbol);

   392

      return is_complex_type(first_non_fb->datatype);

   393

    }

   394

   395

   396

    /* returns the datatype of the variable returned by find_first_nonfb() */

   397

    /* eg:

   398

     *      fb1.fb2.fb3.real       returns ??????

   399

     *      fb1.fb2.struct1.real   returns datatype of struct1

   400

     *      struct1.real           returns datatype of struct1

   401

     */

   402

    static search_var_instance_decl_c::vt_t first_nonfb_vardecltype(symbol_c *symbol, symbol_c *scope) {

   403

      if (NULL == symbol) ERROR;

   404

      if (!get_datatype_info_c::is_type_valid(symbol->datatype)) ERROR;

   405

   406

      symbol_c *first_non_fb = (symbol_c *)find_first_nonfb(symbol);

   407

      if (NULL != singleton_->last_fb) {

   408

        scope = singleton_->last_fb->datatype;

   409

        symbol = singleton_->first_non_fb_identifier;

   410

      }

   411

   412

      search_var_instance_decl_c search_var_instance_decl(scope);

   413

   414

      return search_var_instance_decl.get_vartype(symbol);

   415

    }

   416

   417

   418

    /*********************/

   419

    /* B 1.4 - Variables */

   420

    /*********************/

   421

    void *visit(symbolic_variable_c *symbol) {

   422

      if (!get_datatype_info_c::is_type_valid    (symbol->datatype)) ERROR;

   423

      if (!get_datatype_info_c::is_function_block(symbol->datatype)) {

   424

         first_non_fb_identifier = symbol; 

   425

         return (void *)symbol;

   426

      }

   427

      last_fb = symbol;

   428

      return NULL;

   429

    }

   430

   431

    /*************************************/

   432

    /* B.1.4.2   Multi-element Variables */

   433

    /*************************************/

   434

   435

    // SYM_REF2(structured_variable_c, record_variable, field_selector)

   436

    void *visit(structured_variable_c *symbol) {

   437

      symbol_c *res = (symbol_c *)symbol->record_variable->accept(*this);

   438

      if (NULL != res) return res;

   439

   440

      if (!get_datatype_info_c::is_type_valid    (symbol->datatype)) ERROR;

   441

      if (!get_datatype_info_c::is_function_block(symbol->datatype)) {

   442

         first_non_fb_identifier = symbol->field_selector; 

   443

         return (void *)symbol;

   444

      }

   445

   446

      last_fb = symbol;      

   447

      return NULL;      

   448

    }

   449

   450

    /*  subscripted_variable '[' subscript_list ']' */

   451

    //SYM_REF2(array_variable_c, subscripted_variable, subscript_list)

   452

    void *visit(array_variable_c *symbol) {

   453

      void *res = symbol->subscripted_variable->accept(*this);

   454

      if (NULL != res) return res;

   455

      return (void *)symbol;      

   456

    }

   457

   458

   459

};

   460

   461

analyse_variable_c *analyse_variable_c::singleton_ = NULL;

   462

   463

/***********************************************************************/

   464

/***********************************************************************/

   465

/***********************************************************************/

   466

/***********************************************************************/

   467

   468

   469

#include "generate_c_st.cc"

   470

#include "generate_c_il.cc"

   471

#include "generate_c_inlinefcall.cc"

   472

   473

/***********************************************************************/

   474

/***********************************************************************/

   475

/***********************************************************************/

   476

/***********************************************************************/

   477

   478

#define MILLISECOND 1000000

   479

#define SECOND 1000 * MILLISECOND

   480

   481

unsigned long long calculate_time(symbol_c *symbol) {

   482

  if (NULL == symbol) return 0;

   483

   484

  interval_c *interval = dynamic_cast<interval_c *>(symbol);

   485

  duration_c *duration = dynamic_cast<duration_c *>(symbol);

   486

   487

  if ((NULL == interval) && (NULL == duration))

   488

  	  {STAGE4_ERROR(symbol, symbol, "This type of interval value is not currently supported"); ERROR;}

   489

   490

  if (NULL != duration) {

   491

    /* SYM_REF2(duration_c, neg, interval) */

   492

    if (duration->neg != NULL)

   493

      {STAGE4_ERROR(duration, duration, "Negative TIME literals for interval are not currently supported"); ERROR;}

   494

    return calculate_time(duration->interval);

   495

  }

   496

   497

  if (NULL != interval) {

   498