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/*

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

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 *

     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.

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 *

    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

 *

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

    22

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

    23

 */

    24

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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)->const_value._##dtype.is_valid())

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

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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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 */

    83

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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__)

   101

 */

   102

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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_DREF "__GET_VAR_DREF"

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#define GET_EXTERNAL_DREF "__GET_EXTERNAL_DREF"

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#define GET_EXTERNAL_FB_DREF "__GET_EXTERNAL_FB_DREF"

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#define GET_LOCATED_DREF "__GET_LOCATED_DREF"

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

   174

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

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

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

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static int generate_line_directives__ = 0;

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static int generate_pou_filepairs__   = 0;

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static int generate_plc_state_backup_fuctions__ = 0;

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#ifdef __unix__

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/* Parse command line options passed from main.c !! */

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#include <stdlib.h> // for getsubopt()

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int  stage4_parse_options(char *options) {

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  enum {LINE_OPT = 0,  

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        SEPTFILE_OPT,

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        BACKUP_OPT    /* option to generate function to backup and restore internal PLC state */

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        /*, SOME_OTHER_OPT, YET_ANOTHER_OPT */};

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  char *const token[] = {

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        /*       LINE_OPT*/(char *)"l",

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        /*   SEPTFILE_OPT*/(char *)"p",

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        /*     BACKUP_OPT*/(char *)"b",

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        /* SOME_OTHER_OPT, ...             */

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        NULL };

   197

  /* unfortunately, the above commented out syntax for array initialization is valid in C, but not in C++ */

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  char *subopts = options;

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  char *value;

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  int opt;

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  while (*subopts != '\0') {

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    switch (getsubopt(&subopts, token, &value)) {

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      case     LINE_OPT: generate_line_directives__            = 1; break;

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      case SEPTFILE_OPT: generate_pou_filepairs__              = 1; break;

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      case   BACKUP_OPT: generate_plc_state_backup_fuctions__  = 1; break;

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      default          : fprintf(stderr, "Unrecognized option: -O %s\n", value); return -1; break;

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     }

   210

  }     

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  return 0;

   212

}

   213

   214

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void stage4_print_options(void) {

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  printf("          (options must be separated by commas. Example: 'l,w,x')\n"); 

   217

  printf("      l : insert '#line' directives in generated C code.\n"); 

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  printf("      p : place each POU in a separate pair of files (<pou_name>.c, <pou_name>.h).\n"); 

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  printf("      b : generate functions to backup and restore internal PLC state.\n"); 

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}

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#else /* not __unix__ */

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/* getsubopt isn't supported with mingw, 

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 *  then stage4 options aren't available on windows*/

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void stage4_print_options(void) {}

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int  stage4_parse_options(char *options) {return 0;}

   226

#endif 

   227

   228

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

   229

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

   230

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

   231

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

   232

   233

#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"

   240

   241

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

   242

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

   243

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

   244

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

   245

   246

   247

#include "generate_c.hh"

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   249

   250

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

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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_and_typeid_c {

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  private:

   266

    symbol_c *current_type;

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    bool_type_name_c tmp_bool;

   268

   269

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

   270

      if (data_type != NULL) {

   271

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

   272

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

   273

        if (list == NULL) ERROR;  

   274

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

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          s4o.print("__");

   276

          data_type->accept(*this);

   277

        }  

   278

      }

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    }

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   281

  public:

   282

    print_function_parameter_data_types_c(stage4out_c *s4o_ptr): 

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      generate_c_base_and_typeid_c(s4o_ptr)

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      {current_type = NULL;}

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

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    /* B.1.5 - Program organization units */

   288

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

   289

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

   290

    /* B 1.5.1 - Functions */

   291

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

   292

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

   293

    /* | 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;

   298

    }

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   300

    /* 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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    /* 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}

   308

   309

    void *visit(edge_declaration_c *symbol) {

   310

      {STAGE4_ERROR(symbol, symbol, "R_EDGE and F_EDGE declarations are not currently supported"); ERROR;}

   311

      /* 

   312

      current_type = &tmp_bool; 

   313

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

   314

      current_type = NULL; 

   315

      */

   316

      return NULL;

   317

    }

   318

   319

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

   320

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

   321

   322

    /* 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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   328

    void *visit(simple_spec_init_c *symbol) {

   329

      /* return the data type */

   330

      return symbol->simple_specification; 

   331

    }

   332

   333

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

   334

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

   335

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

   336

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

   337

     */

   338

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

   339

   340

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

   341

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

   342

    /* 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

   344

     */

   345

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

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   347

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

   348

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

   349

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

   350

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

   351

     */

   352

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

   353

   354

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

   355

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

   356

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

   357

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

   358

     */

   359

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

   360

   361

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

   362

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

   363

   364

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

   365

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

   366

   367

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

   368

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

   369

   370

    void *visit(fb_name_decl_c *symbol) {

   371

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

   372

      return NULL;

   373

    }

   374

   375

    void *visit(var1_init_decl_c *symbol) {

   376

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

   377

      return NULL;

   378

    }

   379

   380

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

   381

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

   382

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

   383

   384

    void *visit(structured_var_declaration_c *symbol) {

   385

      current_type = symbol->structure_type_name; 

   386

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

   387

      current_type = NULL; 

   388

      return NULL;

   389

    }

   390

   391

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

   392

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

   393

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

   394

     *   STRING [ 42 ]

   395

     */

   396

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

   397

   398

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

   399

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

   400

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

   401

     *   WSTRING [ 42 ]

   402

     */

   403

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

   404

};

   405

   406

   407

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

   408

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

   409

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

   410

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

   411

   412

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

   413

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

   414

class analyse_variable_c: public search_visitor_c {

   415

  private:

   416

    static analyse_variable_c *singleton_;

   417

   418

  public:

   419

    analyse_variable_c(void) {};

   420

   421

    static bool is_complex_type(symbol_c *symbol) {

   422

      if (NULL == symbol) ERROR;

   423

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

   424

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

   425

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

   426

             );

   427

    }

   428

   429

   430

  private:

   431

    symbol_c *last_fb, *first_non_fb_identifier;

   432

   433

  public:  

   434

    /* 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! */

   435

    /* eg:

   436

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

   437

     *      fb1.fb2.struct1.real   returns struct1

   438

     *      struct1.real           returns struct1

   439

     */

   440

    static symbol_c *find_first_nonfb(symbol_c *symbol) {

   441

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

   442

      if (NULL == singleton_)       ERROR;

   443

      if (NULL == symbol)           ERROR;

   444

   445

      singleton_->last_fb                 = NULL;

   446

      singleton_->first_non_fb_identifier = NULL;

   447

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

   448

    }

   449

   450

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

   451

    /* eg:

   452

     *      fb1.fb2.fb3.real       returns FALSE

   453

     *      fb1.fb2.struct1.real   returns TRUE

   454

     *      struct1.real           returns TRUE

   455

     */

   456

    static bool contains_complex_type(symbol_c *symbol) {

   457

      if (NULL == symbol) ERROR;

   458

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

   459

   460

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

   461

      return is_complex_type(first_non_fb->datatype);

   462

    }

   463

   464

   465

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

   466

    /* eg:

   467

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

   468

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

   469

     *      struct1.real           returns datatype of struct1

   470

     */

   471

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

   472

      if (NULL == symbol) ERROR;

   473

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

   474

   475

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

   476

      if (NULL != singleton_->last_fb) {

   477

        scope = singleton_->last_fb->datatype;

   478

        symbol = singleton_->first_non_fb_identifier;

   479

      }

   480

   481

      search_var_instance_decl_c search_var_instance_decl(scope);

   482

   483

      return search_var_instance_decl.get_vartype(symbol);

   484

    }

   485

   486

   487

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

   488

    /* B 1.4 - Variables */

   489

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

   490

    void *visit(symbolic_variable_c *symbol) {

   491

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

   492

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

   493

         first_non_fb_identifier = symbol; 

   494

         return (void *)symbol;

   495

      }

   496

      last_fb = symbol;