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/*

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

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 *

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 *  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

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

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 *  (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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 *

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

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

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 *

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 *

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 * 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.

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 */

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

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#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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    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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  public:

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    print_function_parameter_data_types_c(stage4out_c *s4o_ptr): 

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      generate_c_base_c(s4o_ptr)

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      {current_type = NULL;}

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

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    /* B.1.5 - Program organization units */

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

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

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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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    }

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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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    /* 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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    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;

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    }

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    /* 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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    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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    }

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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_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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     */

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    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

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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

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     */

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    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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    /* 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}    

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   339

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

   340

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

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   342

    void *visit(fb_name_decl_c *symbol) {

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

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      return NULL;

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    }

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    void *visit(var1_init_decl_c *symbol) {

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

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      return NULL;

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    }

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

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    void *visit(structured_var_declaration_c *symbol) {

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      current_type = symbol->structure_type_name; 

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

   359

      current_type = NULL; 

   360

      return NULL;

   361

    }

   362

   363

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

   364

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

   365

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

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     *   STRING [ 42 ]

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     */

   368

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

   369

   370

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

   371

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

   372

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

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     *   WSTRING [ 42 ]

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     */

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

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};

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

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

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

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

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   384

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

   385

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

   386

class analyse_variable_c: public search_visitor_c {

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  private:

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    static analyse_variable_c *singleton_;

   389

   390

  public:

   391

    analyse_variable_c(void) {};

   392

   393

    static bool is_complex_type(symbol_c *symbol) {

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      if (NULL == symbol) ERROR;

   395

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

   396

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

   397

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

   398

             );

   399

    }

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   401

   402

  private:

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    symbol_c *last_fb, *first_non_fb_identifier;

   404

   405

  public:  

   406

    /* 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! */

   407

    /* eg:

   408

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

   409

     *      fb1.fb2.struct1.real   returns struct1

   410

     *      struct1.real           returns struct1

   411

     */

   412

    static symbol_c *find_first_nonfb(symbol_c *symbol) {

   413

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

   414

      if (NULL == singleton_)       ERROR;

   415

      if (NULL == symbol)           ERROR;

   416

   417

      singleton_->last_fb                 = NULL;

   418

      singleton_->first_non_fb_identifier = NULL;

   419

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

   420

    }

   421

   422

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

   423

    /* eg:

   424

     *      fb1.fb2.fb3.real       returns FALSE

   425

     *      fb1.fb2.struct1.real   returns TRUE

   426

     *      struct1.real           returns TRUE

   427

     */

   428

    static bool contains_complex_type(symbol_c *symbol) {

   429

      if (NULL == symbol) ERROR;

   430

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

   431

   432

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

   433

      return is_complex_type(first_non_fb->datatype);

   434

    }

   435

   436

   437

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

   438

    /* eg:

   439

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

   440

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

   441

     *      struct1.real           returns datatype of struct1

   442

     */

   443

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

   444

      if (NULL == symbol) ERROR;

   445

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

   446

   447

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

   448

      if (NULL != singleton_->last_fb) {

   449

        scope = singleton_->last_fb->datatype;

   450

        symbol = singleton_->first_non_fb_identifier;

   451

      }

   452

   453

      search_var_instance_decl_c search_var_instance_decl(scope);

   454

   455

      return search_var_instance_decl.get_vartype(symbol);

   456

    }

   457

   458

   459

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

   460

    /* B 1.4 - Variables */

   461

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

   462

    void *visit(symbolic_variable_c *symbol) {

   463

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

   464

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

   465

         first_non_fb_identifier = symbol; 

   466

         return (void *)symbol;

   467

      }

   468

      last_fb = symbol;

   469

      return NULL;

   470

    }

   471

   472

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

   473

    /* B.1.4.2   Multi-element Variables */

   474

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

   475

   476

    // SYM_REF2(structured_variable_c, record_variable, field_selector)

   477

    void *visit(structured_variable_c *symbol) {

   478

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

   479

      if (NULL != res) return res;

   480

   481

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

   482

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

   483

         first_non_fb_identifier = symbol->field_selector; 

   484

         return (void *)symbol;

   485

      }

   486

   487

      last_fb = symbol;      

   488

      return NULL;      

   489

    }

   490

   491

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

   492

    //SYM_REF2(array_variable_c, subscripted_variable, subscript_list)

   493

    void *visit(array_variable_c *symbol) {

   494

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

   495

      if (NULL != res) return res;

   496

      return (void *)symbol;      

   497

    }