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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.

    23

 */

    24

    25

#include <string.h>

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typedef struct

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{

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  symbol_c *param_name;

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  symbol_c *param_value;

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  symbol_c *param_type;

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  function_param_iterator_c::param_direction_t param_direction;

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} FUNCTION_PARAM;

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#define DECLARE_PARAM_LIST()\

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  std::list<FUNCTION_PARAM*> param_list;\

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  std::list<FUNCTION_PARAM*>::iterator pt;\

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  FUNCTION_PARAM *param;

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    43

#define ADD_PARAM_LIST(name, value, type, direction)\

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  param = new FUNCTION_PARAM;\

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  param->param_name = name;\

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  param->param_value = value;\

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  param->param_type = type;\

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  param->param_direction = direction;\

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  param_list.push_back(param);

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#define PARAM_LIST_ITERATOR() for(pt = param_list.begin(); pt != param_list.end(); pt++)

    52

    53

#define PARAM_NAME (*pt)->param_name

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#define PARAM_VALUE (*pt)->param_value

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#define PARAM_TYPE (*pt)->param_type

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#define PARAM_DIRECTION (*pt)->param_direction

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    58

#define CLEAR_PARAM_LIST()\

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  PARAM_LIST_ITERATOR()\

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    delete *pt;\

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  param_list.clear();

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    63

    64

class generate_c_base_c: public iterator_visitor_c {

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  protected:

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    stage4out_c &s4o;

    68

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  private:

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    /* Unlike programs that are mapped onto C++ classes, Function Blocks are mapped onto a data structure type

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     * and a separate function containing the code. This function is passed a pointer to an instance of the data

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     * structure. This means that the code inside the functions must insert a pointer to the data structure whenever

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     * it wishes to access a Function Block variable.

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     * The variable_prefix_ variable will contain the correct string which needs to be prefixed to all variable accesses.

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     * This string is set with the set_variable_prefix() member function.

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     */

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    const char *variable_prefix_;

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  public:

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    generate_c_base_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) {

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      variable_prefix_ = NULL;

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    }

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    ~generate_c_base_c(void) {}

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    void set_variable_prefix(const char *variable_prefix) {variable_prefix_ = variable_prefix;}

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    const char *get_variable_prefix(void) {return variable_prefix_;}

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    bool is_variable_prefix_null(void) {return variable_prefix_ == NULL;}

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    void print_variable_prefix(void) {

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      if (variable_prefix_ != NULL)

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        s4o.print(variable_prefix_);

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    }

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    void *print_token(token_c *token, int offset = 0) {

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      return s4o.printupper((token->value)+offset);

    95

    }

    96

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    void *print_literal(symbol_c *type, symbol_c *value) {

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      s4o.print("__");

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      type->accept(*this);

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      s4o.print("_LITERAL(");

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      value->accept(*this);

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      s4o.print(")");

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      return NULL;

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    }

   105

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    void *print_striped_token(token_c *token, int offset = 0) {

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      std::string str = "";

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      bool leading_zero = true;

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

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        if (leading_zero &&

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        	(token->value[i] != '0' ||

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        	 i == strlen(token->value) - 1 ||

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        	 token->value[i + 1] == '.'

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        	))

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          leading_zero = false;

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

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          str += token->value[i];

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      }

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      return s4o.printupper(str);

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    }

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    void *print_striped_binary_token(token_c *token, unsigned int offset = 0) {

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      /* convert the binary value to hexadecimal format... */

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      unsigned char value, bit_mult;

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      unsigned int i;

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      int total_bits;

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      char str[2] = {'A', '\0'};  /* since the s4o object is not prepared to print out one character at a time... */

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      s4o.print("0x");

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      total_bits = 0;

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      for (i = offset; i < strlen(token->value); i++)

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

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	  total_bits++;

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      value = 0;

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      bit_mult = (unsigned char)1 << (((total_bits+3)%4)+1);

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      for (i = offset; i < strlen(token->value); i++) {

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

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	  bit_mult /= 2;

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	  value += bit_mult * ((token->value[i] == '0')? 0:1);

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	  if (bit_mult == 1) {

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	    str[0] = (value <= 9)? (char)'0' + value : (char)'A' + value - 10;

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	    s4o.print(str);

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            bit_mult = 0x10;

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            value = 0;

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	  }

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	}

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      }

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      return NULL;

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    }

   153

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    void *print_list(list_c *list,

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		     std::string pre_elem_str = "",

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		     std::string inter_elem_str = "",

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		     std::string post_elem_str = "",

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		     visitor_c *visitor = NULL) {

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      if (visitor == NULL) visitor = this;

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      if (list->n > 0) {

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//std::cout << "generate_c_base_c::print_list(n = " << list->n << ")   000\n";

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        s4o.print(pre_elem_str);

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        list->elements[0]->accept(*visitor);

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      }

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      for(int i = 1; i < list->n; i++) {

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//std::cout << "generate_c_base_c::print_list   " << i << "\n";

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        s4o.print(inter_elem_str);

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        list->elements[i]->accept(*visitor);

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      }

   172

   173

      if (list->n > 0)

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        s4o.print(post_elem_str);

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      return NULL;

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    }

   178

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    void *print_binary_expression(symbol_c *l_exp,

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				  symbol_c *r_exp,

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				  const char *operation) {

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      s4o.print("(");

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      l_exp->accept(*this);

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      s4o.print(operation);

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      r_exp->accept(*this);

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      s4o.print(")");

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      return NULL;

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    }

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    void *print_unary_expression(symbol_c *exp,

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				 const char *operation) {

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      s4o.print(operation);

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      s4o.print("(");

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      exp->accept(*this);

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      s4o.print(")");

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      return NULL;

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    }

   199

   200

    void *print_binary_function(const char *function,

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          symbol_c *l_exp,

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				  symbol_c *r_exp) {

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      s4o.print(function);

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      s4o.print("(");

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      l_exp->accept(*this);

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      s4o.print(", ");

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      r_exp->accept(*this);

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      s4o.print(")");

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      return NULL;

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   	}

   211

   212

    void *print_compare_function(const char *function,

   213

          symbol_c *compare_type,

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          symbol_c *l_exp,

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          symbol_c *r_exp) {

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      s4o.print(function);

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      compare_type->accept(*this);

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      s4o.print("(__BOOL_LITERAL(TRUE), NULL, 2, ");

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      l_exp->accept(*this);

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      s4o.print(", ");

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      r_exp->accept(*this);

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      s4o.print(")");

   223

      return NULL;

   224

    }

   225

   226

    void *print_check_function(symbol_c *type,

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          symbol_c *value,

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          symbol_c *fb_name = NULL,

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          bool temp = false) {

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      if (is_subrange) {

   233

		s4o.print("__CHECK_");

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		type->accept(*this);

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		s4o.print("(");

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      }

   237

      if (fb_name != NULL) {

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        s4o.print(GET_VAR);

   239

        s4o.print("(");

   240

        print_variable_prefix();

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        fb_name->accept(*this);

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        s4o.print(".");

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        value->accept(*this);

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        s4o.print(")");

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      }

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      else {

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        if (temp)

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    	  s4o.print(TEMP_VAR);

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        value->accept(*this);

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      }

   251

      if (is_subrange)

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        s4o.print(")");

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      return NULL;

   254

    }

   255

   256

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

   257

/* 2.1.6 - Pragmas  */

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

   259

    void *visit(enable_code_generation_pragma_c * symbol)   {s4o.enable_output();  return NULL;}

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    void *visit(disable_code_generation_pragma_c * symbol)  {s4o.disable_output(); return NULL;} 

   261

   262

    /* Do not use print_token() as it will change everything into uppercase */

   263

    void *visit(pragma_c *symbol) {

   264

        s4o.print(s4o.indent_spaces);

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        s4o.print("#define GetFbVar(var,...) __GET_VAR(data__->var,__VA_ARGS__)\n");

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        s4o.print(s4o.indent_spaces);

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        s4o.print("#define SetFbVar(var,val,...) __SET_VAR(data__->,var,val,__VA_ARGS__)\n");

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        s4o.print(symbol->value);

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        s4o.print("\n");

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        s4o.print(s4o.indent_spaces);

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        s4o.print("#undef GetFbVar\n");

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        s4o.print(s4o.indent_spaces);

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        s4o.print("#undef SetFbVar\n");

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        return NULL;

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    }

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

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/* B 0 - Programming Model */

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

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  /* leave for derived classes... */

   282

   283

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   285

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

   286

/* B.1 - Common elements */

   287

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

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

   289

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

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

   291

    void *visit(identifier_c *symbol) {return print_token(symbol);}

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   293

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

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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 */

   300

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

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    void *visit(real_c *symbol) {return print_striped_token(symbol);}

   302

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

   303

    void *visit(binary_integer_c *symbol) {return print_striped_binary_token(symbol, 2);}

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    void *visit(octal_integer_c *symbol) {s4o.print("0"); return print_striped_token(symbol, 2);}

   305

    void *visit(hex_integer_c *symbol) {s4o.print("0x"); return print_striped_token(symbol, 3);}

   306

   307

    void *visit(neg_real_c *symbol) {

   308

      s4o.print("-");

   309

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

   310

      return NULL;

   311

    }

   312

   313

    void *visit(neg_integer_c *symbol) {

   314

      s4o.print("-");

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

   316

      return NULL;

   317

    }

   318

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    void *visit(integer_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   320

    void *visit(real_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   321

    void *visit(bit_string_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

   322

    void *visit(boolean_literal_c *symbol) {

   323

      if (NULL != symbol->type)

   324

        return print_literal(symbol->type, symbol->value);

   325

      else {

   326

	bool_type_name_c bool_type;

   327

	return print_literal(&bool_type, symbol->value);

   328

      }

   329

    }

   330

   331

    /* helper class for boolean_literal_c */

   332

    void *visit(boolean_true_c *symbol) {s4o.print("TRUE"); return NULL;}

   333

    void *visit(boolean_false_c *symbol) {s4o.print("FALSE"); return NULL;}

   334

   335

    void *visit(neg_expression_c *symbol) {

   336

      s4o.print("-");

   337

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

   338

      return NULL;

   339

    }

   340

   341

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

   342

/* B.1.2.2   Character Strings */

   343

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

   344

    void *visit(double_byte_character_string_c *symbol) {

   345

      // TO DO ...

   346

      ERROR;

   347

      return print_token(symbol);

   348

    }

   349

   350

    void *visit(single_byte_character_string_c *symbol) {

   351

      std::string str = "";

   352

      unsigned int count = 0; 

   353

      str += '"';

   354

      /* we ignore the first and last bytes, they will be the character ' */

   355

      for (unsigned int i = 1; i < strlen(symbol->value) - 1; i++) {

   356

        char c = symbol->value[i];

   357

        if ((c == '\\') || (c == '"'))

   358

          {str += '\\'; str += c; count ++; continue;}

   359

        if (c != '$')

   360

          {str += c; count++; continue;}

   361

        /* this should be safe, since the code has passed the syntax parser!! */

   362

        c = symbol->value[++i];

   363

        switch (c) {

   364

          case '$':

   365

          case '\'':

   366

            {str += c; count++; continue;}

   367

          case 'L':

   368

          case 'l':

   369

            {str += "\x0A"; /* LF */; count++; continue;}

   370

          case 'N':

   371

          case 'n':

   372

            {str += "\\x0A"; /* NL */; count++; continue;}

   373

          case 'P':

   374

          case 'p':

   375

            {str += "\\f"; /* FF */; count++; continue;}

   376

          case 'R':

   377

          case 'r':

   378

            {str += "\\r"; /* CR */; count++; continue;}

   379

          case 'T':

   380

          case 't':

   381

            {str += "\\t"; /* tab */; count++; continue;}

   382

          default: {

   383

            if (isxdigit(c)) {

   384

              /* this should be safe, since the code has passed the syntax parser!! */

   385

	      char c2 = symbol->value[++i];

   386

	      if (isxdigit(c2)) {

   387

	        str += '\\'; str += 'x'; str += c; str += c2;

   388

	        count++; continue;

   389

	      }

   390

	    }

   391

          }

   392

          /* otherwise we have an invalid string!! */

   393

          /* This should not have got through the syntax parser! */

   394

          ERROR;

   395

        } /* switch() */

   396

      } /* for() */

   397

   398

      str += '"';

   399

      s4o.print("__STRING_LITERAL(");

   400

      s4o.print(count); 

   401

      s4o.print(",");

   402

      s4o.print(str);

   403

      s4o.print(")");

   404

      return NULL;

   405

    }

   406

   407

   408

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

   409

/* B 1.2.3 - Time Literals */

   410

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

   411

   412

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

   413

/* B 1.2.3.1 - Duration */

   414

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

   415

/* The following output is actually the parameters to the constructor of the TIME class! */

   416

   417

/* SYM_REF0(neg_time_c) */

   418

void *visit(neg_time_c *symbol) {s4o.print("-1"); /* negative time value */; return NULL;}

   419

   420

   421

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

   422

void *visit(duration_c *symbol) {

   423

  TRACE("duration_c");

   424

  s4o.print("__time_to_timespec(");

   425

   426

  if (NULL == symbol->neg)    s4o.print("1");  /* positive time value */

   427

  else                        symbol->neg->accept(*this);  /* this will print '-1'   :-) */

   428

   429

  s4o.print(", ");

   430

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

   431

  s4o.print(")");

   432

  return NULL;

   433

}

   434

   435

   436

/* SYM_TOKEN(fixed_point_c) */

   437

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

   438

   439

/* SYM_REF5(interval_c, days, hours, minutes, seconds, milliseconds) */

   440

void *visit(interval_c *symbol) {

   441

  TRACE("interval_c");

   442

  /* s4o.print("0, 0, 0, 0, 0");  // milliseconds, seconds, minutes, hours, days */

   443

  if (NULL == symbol->milliseconds) s4o.print("0");  /* milliseconds */

   444

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

   445

  s4o.print(", ");

   446

   447

  if (NULL == symbol->seconds)      s4o.print("0");  /* seconds */

   448

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

   449

  s4o.print(", ");

   450

   451

  if (NULL == symbol->minutes)      s4o.print("0");  /* minutes */

   452

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

   453

  s4o.print(", ");

   454

   455

  if (NULL == symbol->hours)        s4o.print("0");  /* hours */

   456

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

   457

  s4o.print(", ");

   458

   459

  if (NULL == symbol->days)         s4o.print("0");  /* days */

   460

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

   461

   462

  return NULL;

   463

}

   464

   465

   466

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

   467

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

   468

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

   469

   470

/* SYM_REF2(time_of_day_c, daytime, unused) */

   471

void *visit(time_of_day_c *symbol) {

   472

  TRACE("time_of_day_c");

   473

  s4o.print("__tod_to_timespec(");

   474

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

   475

  s4o.print(")");

   476

  return NULL;

   477

}

   478

   479

   480

/* SYM_REF4(daytime_c, day_hour, day_minute, day_second, unused) */

   481

void *visit(daytime_c *symbol) {

   482

  TRACE("daytime_c");

   483

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

   484

  s4o.print(", ");

   485

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

   486

  s4o.print(", ");

   487

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

   488

  return NULL;

   489

}

   490

   491

   492

/* SYM_REF2(date_c, date_literal, unused) */

   493

void *visit(date_c *symbol) {

   494

  TRACE("date_c");

   495

  s4o.print("__date_to_timespec(");

   496

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

   497

  s4o.print(")");

   498

  return NULL;

   499

}

   500

   501

   502

/* SYM_REF4(date_literal_c, year, month, day, unused) */

   503

void *visit(date_literal_c *symbol) {

   504

  TRACE("date_literal_c");

   505

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

   506

  s4o.print(", ");

   507

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

   508

  s4o.print(", ");

   509

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

   510

  return NULL;

   511

}

   512

   513