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/*

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 * (c) 2003 Mario de Sousa

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 *

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 * Offered to the public under the terms of the GNU General Public License

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 * as published by the Free Software Foundation; either version 2 of the

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 * License, or (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, but

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 * WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

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 * Public License for more details.

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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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/*

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 * An IEC 61131-3 IL and ST compiler.

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 *

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 * Based on the

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

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 *

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 */

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/*

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 * This is one of the versions available for the 4th stage.

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 *

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 * This 4th stage generates a c++ source program equivalent

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 * to the IL and ST code.

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 */

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// #include <stdio.h>  /* required for NULL */

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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 <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 "../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 ERROR error_exit(__FILE__,__LINE__)

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/* function defined in main.cc */

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extern void error_exit(const char *file_name, int line_no);

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

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

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

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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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/* 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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#include "generate_c_st.cc"

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#include "generate_c_il.cc"

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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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#define MILLISECOND 1000000

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#define SECOND 1000 * MILLISECOND

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/* A helper class that knows how to generate code for both the IL and ST languages... */

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class calculate_time_c: public iterator_visitor_c {

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  private:

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    unsigned long long time;

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    float current_value;

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  public:

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    calculate_time_c(void){time = 0;};

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    unsigned long long get_time(void) {return time;};

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    void *get_integer_value(token_c *token) {

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      std::string str = "";

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      for (unsigned int i = 0; i < strlen(token->value); i++)

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        if (token->value[i] != '_')

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          str += token->value[i];

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      current_value = atof(str.c_str());

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      return NULL;

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    }

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    void *get_float_value(token_c *token) {

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      current_value = atof(token->value);

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      return NULL;

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    }

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

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/* B 1.2.1 - Numeric Literals */

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

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    void *visit(integer_c *symbol) {return get_integer_value(symbol);}

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

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/* B 1.2.3.1 - Duration */

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

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

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    void *visit(duration_c *symbol) {

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      if (symbol->neg != NULL)

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        ERROR;

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

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      return NULL;

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    }

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    /* SYM_TOKEN(fixed_point_c) */

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    void *visit(fixed_point_c *symbol) {return get_float_value(symbol);}

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    /* SYM_REF2(days_c, days, hours) */

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    void *visit(days_c *symbol) {

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      if (symbol->hours)

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

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

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      time += (unsigned long long)(current_value * 24 * 3600 * SECOND);

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      return NULL;

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    }

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    /* SYM_REF2(hours_c, hours, minutes) */

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    void *visit(hours_c *symbol) {

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      if (symbol->minutes)

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

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

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      time += (unsigned long long)(current_value * 3600 * SECOND);

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      return NULL;

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    }

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    /* SYM_REF2(minutes_c, minutes, seconds) */

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    void *visit(minutes_c *symbol) {

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      if (symbol->seconds)

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

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

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      time += (unsigned long long)(current_value * 60 * SECOND);

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      return NULL;

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    }

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    /* SYM_REF2(seconds_c, seconds, milliseconds) */

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    void *visit(seconds_c *symbol) {

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      if (symbol->milliseconds)

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

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

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      time += (unsigned long long)(current_value * SECOND);

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      return NULL;

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    }

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    /* SYM_REF2(milliseconds_c, milliseconds, unused) */

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    void *visit(milliseconds_c *symbol) {

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

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      time += (unsigned long long)(current_value * MILLISECOND);

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

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class calculate_common_ticktime_c: public iterator_visitor_c {

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  private:

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    unsigned long long common_ticktime;

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    unsigned long long least_common_ticktime;

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  public:

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    calculate_common_ticktime_c(void){

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      common_ticktime = 0;

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      least_common_ticktime = 0;

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    }

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    unsigned long long euclide(unsigned long long a, unsigned long long b) {

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      unsigned long long c = a % b;

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      if (c == 0)

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        return b;

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      else

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        return euclide(b, c);

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    }

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    void update_ticktime(unsigned long long time) {

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      if (common_ticktime == 0)

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        common_ticktime = time;

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      else if (time > common_ticktime)

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        common_ticktime = euclide(time, common_ticktime);

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      else

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        common_ticktime = euclide(common_ticktime, time);

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      if (least_common_ticktime == 0)

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        least_common_ticktime = time;

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      else

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        least_common_ticktime = (least_common_ticktime * time) / common_ticktime;

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    }

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    unsigned long long get_common_ticktime(void) {

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      return common_ticktime;

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    }

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    unsigned long get_greatest_tick_count(void) {

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      unsigned long long least_common_tick = least_common_ticktime / common_ticktime;

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      if (least_common_tick >> 32)

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        ERROR;

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      return (unsigned long)(~(((unsigned long)-2) % (unsigned long)least_common_tick) + 1);

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    }

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/*  TASK task_name task_initialization */

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//SYM_REF2(task_configuration_c, task_name, task_initialization)  

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    void *visit(task_initialization_c *symbol) {

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      calculate_time_c calculate_time;

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      unsigned long long time = 0;

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      if (symbol->interval_data_source != NULL) {

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        symbol->interval_data_source->accept(calculate_time);

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        time = calculate_time.get_time();

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      }

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      if (time > 0)

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        update_ticktime(time);

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

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class generate_c_SFC_IL_ST_c: public null_visitor_c {

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  private:

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    stage4out_c *s4o_ptr;

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    symbol_c *scope;

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    const char *variable_prefix;

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  public:

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

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    /* B.1.6  Sequential function chart elements */

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

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    /*| sequential_function_chart sfc_network*/

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    void *visit(sequential_function_chart_c * symbol);

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

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

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

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

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    /* B 2.1 Instructions and Operands */

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

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    /*| instruction_list il_instruction */

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    void *visit(instruction_list_c *symbol);

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    /* Remainder implemented in generate_c_il_c... */

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

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

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

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

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    /* B 3.1 - Expressions */

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

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    /* Implemented in generate_c_st_c */

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

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    /* B 3.2 Statements */

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

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    void *visit(statement_list_c *symbol);

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/* Remainder implemented in generate_c_st_c... */

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};

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#include "generate_c_sfc.cc"

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  if (NULL == scope) ERROR;

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  this->s4o_ptr = s4o_ptr;

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  this->scope = scope;

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  this->variable_prefix = variable_prefix;

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}

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void *generate_c_SFC_IL_ST_c::visit(sequential_function_chart_c * symbol) {

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  generate_c_sfc.generate(symbol);

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  return NULL;

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}

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void *generate_c_SFC_IL_ST_c::visit(instruction_list_c *symbol) {

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  generate_c_il.generate(symbol);

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  return NULL;

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}

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void *generate_c_SFC_IL_ST_c::visit(statement_list_c *symbol) {

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  generate_c_st.generate(symbol);

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

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class generate_c_pous_c: public generate_c_typedecl_c {

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  public:

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    generate_c_pous_c(stage4out_c *s4o_ptr, stage4out_c *s4o_incl_ptr)

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      : generate_c_typedecl_c(s4o_ptr, s4o_incl_ptr) {};

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    virtual ~generate_c_pous_c(void) {}

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  public:

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

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/* B.1 - Common elements */

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

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

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/* B 1.1 - Letters, digits and identifiers */

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

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  /* done in base class(es) */

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

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/* B 1.2 - Constants */

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

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  /* originally empty... */

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

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/* B 1.2.1 - Numeric Literals */

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

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  /* done in base class(es) */

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

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/* B.1.2.2   Character Strings */

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

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  /* done in base class(es) */

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

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/* B 1.2.3 - Time Literals */

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

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

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/* B 1.2.3.1 - Duration */

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

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  /* done in base class(es) */

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

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/* B 1.2.3.2 - Time of day and Date */

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

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  /* done in base class(es) */

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

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/* B.1.3 - Data types */

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

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

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/* B 1.3.1 - Elementary Data Types */

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

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  /* done in base class(es) */

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

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/* B.1.3.2 - Generic data types */

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

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  /* originally empty... */

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

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/* B 1.3.3 - Derived data types */

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

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  /* done in base class(es) */

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

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/* B 1.4 - Variables */

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

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  /* done in base class(es) */

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

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/* B.1.4.1   Directly Represented Variables */

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

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  /* done in base class(es) */

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

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/* B.1.4.2   Multi-element Variables */

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

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  /* done in base class(es) */

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

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/* B 1.4.3 - Declaration & Initialisation */

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