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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

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 *  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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 *

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 *  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

 *

    20

 *

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

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/* 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

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 *  TEST_body__(TEST *data__)

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 */

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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_REF "__GET_VAR_REF"

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#define GET_EXTERNAL_REF "__GET_EXTERNAL_REF"

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#define GET_EXTERNAL_FB_REF "__GET_EXTERNAL_FB_REF"

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#define GET_LOCATED_REF "__GET_LOCATED_REF"

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

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

   172

   173

#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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   195

/* 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.

   199

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

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      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++) {

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          s4o.print("__");

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          data_type->accept(*this);

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        }  

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      }

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    }

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   221

  public:

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    print_function_parameter_data_types_c(stage4out_c *s4o_ptr): 

   223

      generate_c_base_c(s4o_ptr)

   224

      {current_type = NULL;}

   225

   226

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

   227

    /* B.1.5 - Program organization units */

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

   229

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

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    /* B 1.5.1 - Functions */

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

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    /*   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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    }

   239

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

   241

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

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   243

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

   244

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

   245

   246

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

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

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   249

    void *visit(edge_declaration_c *symbol) {

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      current_type = &tmp_bool; 

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

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      current_type = NULL; 

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      return NULL;

   254

    }

   255

   256

    /* 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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   259

    /* 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) */

   263

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

   264

   265

    void *visit(simple_spec_init_c *symbol) {

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      /* return the data type */

   267

      return symbol->simple_specification; 

   268

    }

   269

   270

    /* 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_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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     */

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    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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     */

   282

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

   283

   284

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

   285

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

   286

    /* 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

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     */

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    void *visit(array_var_init_decl_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_structured_type_name

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

   295

     */

   296

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

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   298

    /* 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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   301

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

   302

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

   303

   304

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

   305

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

   306

   307

    void *visit(fb_name_decl_c *symbol) {

   308

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

   309

      return NULL;

   310

    }

   311

   312

    void *visit(var1_init_decl_c *symbol) {

   313

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

   314

      return NULL;

   315

    }

   316

   317

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

   318

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

   319

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

   320

   321

    void *visit(structured_var_declaration_c *symbol) {

   322

      current_type = symbol->structure_type_name; 

   323

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

   324

      current_type = NULL; 

   325

      return NULL;

   326

    }

   327

   328

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

   329

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

   330

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

   331

     *   STRING [ 42 ]

   332

     */

   333

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

   334

   335

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

   336

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

   337

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

   338

     *   WSTRING [ 42 ]

   339

     */

   340

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

   341

};

   342

   343

   344

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

   345

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

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

   347

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

   348

   349

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

   350

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

   351

class analyse_variable_c: public search_visitor_c {

   352

  private:

   353

    static analyse_variable_c *singleton_;

   354

   355

  public:

   356

    analyse_variable_c(void) {};

   357

   358

    static bool is_complex_type(symbol_c *symbol) {

   359

      if (NULL == symbol) ERROR;

   360

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

   361

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

   362

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

   363

             );

   364

    }

   365

   366

   367

  private:

   368

    symbol_c *last_fb, *first_non_fb_identifier;

   369

   370

  public:  

   371

    /* 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! */

   372

    /* eg:

   373

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

   374

     *      fb1.fb2.struct1.real   returns struct1

   375

     *      struct1.real           returns struct1

   376

     */

   377

    static symbol_c *find_first_nonfb(symbol_c *symbol) {

   378

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

   379

      if (NULL == singleton_)       ERROR;

   380

      if (NULL == symbol)           ERROR;

   381

   382

      singleton_->last_fb                 = NULL;

   383

      singleton_->first_non_fb_identifier = NULL;

   384

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

   385

    }

   386

   387

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

   388

    /* eg:

   389

     *      fb1.fb2.fb3.real       returns FALSE

   390

     *      fb1.fb2.struct1.real   returns TRUE

   391

     *      struct1.real           returns TRUE

   392

     */

   393

    static bool contains_complex_type(symbol_c *symbol) {

   394

      if (NULL == symbol) ERROR;

   395

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

   396

   397

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

   398

      return is_complex_type(first_non_fb->datatype);

   399

    }

   400

   401

   402

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

   403

    /* eg:

   404

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

   405

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

   406

     *      struct1.real           returns datatype of struct1

   407

     */

   408

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

   409

      if (NULL == symbol) ERROR;

   410

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

   411

   412

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

   413

      if (NULL != singleton_->last_fb) {

   414

        scope = singleton_->last_fb->datatype;

   415

        symbol = singleton_->first_non_fb_identifier;

   416

      }

   417

   418

      search_var_instance_decl_c search_var_instance_decl(scope);

   419

   420

      return search_var_instance_decl.get_vartype(symbol);

   421

    }

   422

   423

   424

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

   425

    /* B 1.4 - Variables */

   426

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

   427

    void *visit(symbolic_variable_c *symbol) {

   428

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

   429

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

   430

         first_non_fb_identifier = symbol; 

   431

         return (void *)symbol;

   432

      }

   433

      last_fb = symbol;

   434

      return NULL;

   435

    }

   436

   437

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

   438

    /* B.1.4.2   Multi-element Variables */

   439

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

   440

   441

    // SYM_REF2(structured_variable_c, record_variable, field_selector)

   442

    void *visit(structured_variable_c *symbol) {

   443

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

   444

      if (NULL != res) return res;

   445

   446

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

   447

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

   448

         first_non_fb_identifier = symbol->field_selector; 

   449

         return (void *)symbol;

   450

      }

   451

   452

      last_fb = symbol;      

   453

      return NULL;      

   454

    }

   455

   456

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

   457

    //SYM_REF2(array_variable_c, subscripted_variable, subscript_list)

   458

    void *visit(array_variable_c *symbol) {

   459

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

   460

      if (NULL != res) return res;

   461

      return (void *)symbol;      

   462

    }

   463

   464

   465

};

   466

   467

analyse_variable_c *analyse_variable_c::singleton_ = NULL;

   468

   469

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

   470

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

   471

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

   472

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

   473

   474

   475

#include "generate_c_st.cc"

   476

#include "generate_c_il.cc"

   477

#include "generate_c_inlinefcall.cc"

   478

   479

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

   480

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

   481

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

   482

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

   483

   484

#define MILLISECOND 1000000

   485

#define SECOND 1000 * MILLISECOND

   486

   487

unsigned long long calculate_time(symbol_c *symbol) {

   488

  if (NULL == symbol) return 0;

   489

   490

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

   491

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

   492

   493

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

   494

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

   495

   496

  if (NULL != duration) {

   497

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

   498