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

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

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

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class search_location_type_c: public iterator_visitor_c {

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  public:

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    typedef enum {

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      none_lt,

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      input_lt,

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      output_lt,

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      memory_lt

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    } locationtype_t;

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    locationtype_t current_location_type;

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  public:

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    search_location_type_c(void) {}

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    virtual ~search_location_type_c(void) {}

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    locationtype_t get_location_type(symbol_c *symbol) {

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      current_location_type = none_lt;

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      symbol->accept(*this);

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      if (current_location_type == none_lt) ERROR;

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      return current_location_type;

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    }

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    59

  private:

    60

    61

    void *visit(incompl_location_c* symbol) {

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      if (symbol->value[1] == 'I')

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        current_location_type = input_lt;

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     else if (symbol->value[1] == 'Q')

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        current_location_type = output_lt;

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     else if (symbol->value[1] == 'M')

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        current_location_type = memory_lt;

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      return NULL;

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    }

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    void *visit(direct_variable_c *symbol) {

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      if (symbol->value[1] == 'I')

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        current_location_type = input_lt;

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     else if (symbol->value[1] == 'Q')

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        current_location_type = output_lt;

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     else if (symbol->value[1] == 'M')

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        current_location_type = memory_lt;

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

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

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

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

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class search_type_symbol_c: public iterator_visitor_c {

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  public:

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    typedef enum {

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      none_vtc,

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      variable_vtc,

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      array_vtc,

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      structure_vtc,

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      function_block_vtc

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    } vartypecategory_t;

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    vartypecategory_t current_var_type_category;

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   107

  private:

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    symbol_c *current_var_type_symbol;

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    symbol_c *current_var_type_name;

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    search_fb_typedecl_c *search_fb_typedecl;

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   112

  public:

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    search_type_symbol_c(symbol_c *scope) {

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      search_fb_typedecl = new search_fb_typedecl_c(scope);

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    }

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   117

    virtual ~search_type_symbol_c(void) {

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      delete search_fb_typedecl;

   119

    }

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   121

    symbol_c *get_type_symbol(symbol_c* symbol) {

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      this->current_var_type_category = variable_vtc;

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      this->current_var_type_symbol = NULL;

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      this->current_var_type_name = NULL;

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      symbol_c* var_type_symbol = spec_init_sperator_c::get_spec(symbol);

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      if (var_type_symbol == NULL) {

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        var_type_symbol = symbol;

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      }

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      var_type_symbol->accept(*this);

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   133

      if (this->current_var_type_symbol == NULL)

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    	this->current_var_type_symbol = var_type_symbol;

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      return (this->current_var_type_symbol);

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    }

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    symbol_c *get_current_type_name(void) {

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      if (this->current_var_type_name == NULL)

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    	return (this->current_var_type_symbol);

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      return (this->current_var_type_name);

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    }

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    void *visit(identifier_c* symbol) {

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      if (this->current_var_type_name == NULL) {

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        this->current_var_type_name = symbol;

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        this->current_var_type_symbol = search_fb_typedecl->get_decl(this->current_var_type_name);

   151

        if (this->current_var_type_symbol != NULL)

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          this->current_var_type_category = function_block_vtc;

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        else {

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          this->current_var_type_symbol = search_base_type_c::get_basetype_decl(this->current_var_type_name);

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          this->current_var_type_symbol->accept(*this);

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        }

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      }

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      return NULL;

   160

    }

   161

   162

    void *visit(array_specification_c* symbol) {

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      this->current_var_type_category = array_vtc;

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   165

      if (this->current_var_type_name == NULL)

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        this->current_var_type_name = symbol->non_generic_type_name;

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      return NULL;

   169

    }

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    void *visit(structure_element_declaration_list_c* symbol) {

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      this->current_var_type_category = structure_vtc;

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

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

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

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

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class generate_var_list_c: protected generate_c_typedecl_c {

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  public:

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    typedef struct

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    {

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      symbol_c *symbol;

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    } SYMBOL;

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    typedef enum {

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      none_dt,

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      programs_dt,

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      variables_dt

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    } declarationtype_t;

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    declarationtype_t current_declarationtype;

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    typedef enum {

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      none_vcc,

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      external_vcc,

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      located_input_vcc,

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      located_memory_vcc,

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      located_output_vcc

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    } varclasscategory_t;

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    varclasscategory_t current_var_class_category;

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  private:

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    symbol_c *current_var_type_symbol;

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    symbol_c *current_var_type_name;

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    unsigned int current_var_number;

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    unsigned int step_number;

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    unsigned int transition_number;

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    unsigned int action_number;

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    bool configuration_defined;

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    std::list<SYMBOL> current_symbol_list;

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    search_type_symbol_c *search_type_symbol;

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  public:

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    generate_var_list_c(stage4out_c *s4o_ptr, symbol_c *scope)

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    : generate_c_typedecl_c(s4o_ptr) {

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      search_type_symbol = new search_type_symbol_c(scope);

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      current_var_number = 0;

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      current_var_type_symbol = NULL;

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      current_var_type_name = NULL;

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      current_declarationtype = none_dt;

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      current_var_class_category = none_vcc;

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    }

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    ~generate_var_list_c(void) {

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      delete search_type_symbol;

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    }

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    void update_var_type_symbol(symbol_c *symbol) {

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      this->current_var_type_symbol = search_type_symbol->get_type_symbol(symbol);

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      this->current_var_type_name = search_type_symbol->get_current_type_name();

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    }

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    void reset_var_type_symbol(void) {

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      this->current_var_type_symbol = NULL;

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    }

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    void generate_programs(symbol_c *symbol) {

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      s4o.print("// Programs\n");

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      current_var_number = 0;

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      configuration_defined = false;

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      current_declarationtype = programs_dt;

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      symbol->accept(*this);

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      current_declarationtype = none_dt;

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      s4o.print("\n");

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    }

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    void generate_variables(symbol_c *symbol) {

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      s4o.print("// Variables\n");

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      current_var_number = 0;

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      configuration_defined = false;

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      current_declarationtype = variables_dt;

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      symbol->accept(*this);

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      current_declarationtype = none_dt;

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      s4o.print("\n");

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    }

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    void declare_variables(symbol_c *symbol) {

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

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      /* should NEVER EVER occur!! */

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      if (list == NULL) ERROR;

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

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        declare_variable(list->elements[i]);

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      }

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    }

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    void declare_variable(symbol_c *symbol) {

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      // Arrays and structures are not supported in debugging

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      switch (search_type_symbol->current_var_type_category) {

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          case search_type_symbol_c::array_vtc:

   282

          case search_type_symbol_c::structure_vtc:

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          return;

   284

          default:

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           break;

   286

      }

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      print_var_number();

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      s4o.print(";");

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      switch (search_type_symbol->current_var_type_category) {

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        case search_type_symbol_c::array_vtc:

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          s4o.print("ARRAY");

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          break;

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        case search_type_symbol_c::structure_vtc:

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          s4o.print("STRUCT");

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          break;

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        case search_type_symbol_c::function_block_vtc:

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          s4o.print("FB");

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          break;

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        default:

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          switch (this->current_var_class_category) {

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            case external_vcc:

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             s4o.print("EXT");

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             break;

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            case located_input_vcc:

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             s4o.print("IN");

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             break;

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            case located_memory_vcc:

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             s4o.print("MEM");

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             break;

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            case located_output_vcc:

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             s4o.print("OUT");

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             break;

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            default:

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             s4o.print("VAR");

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             break;

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          }

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          break;

   318

      }

   319

      s4o.print(";");

   320

      print_symbol_list();

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      symbol->accept(*this);

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      s4o.print(";");

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      print_symbol_list();

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      symbol->accept(*this);

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      s4o.print(";");

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      switch (search_type_symbol->current_var_type_category) {

   327

        case search_type_symbol_c::structure_vtc:

   328

        case search_type_symbol_c::function_block_vtc:

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          this->current_var_type_name->accept(*this);

   330

          s4o.print(";\n");

   331

          SYMBOL *current_name;

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          symbol_c *tmp_var_type;

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          current_name = new SYMBOL;

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          current_name->symbol = symbol;

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          tmp_var_type = this->current_var_type_symbol;

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          current_symbol_list.push_back(*current_name);

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          this->current_var_type_symbol->accept(*this);

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          current_symbol_list.pop_back();

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          this->current_var_type_symbol = tmp_var_type;

   340

          break;

   341

        case search_type_symbol_c::array_vtc:

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          this->current_var_type_name->accept(*this);

   343

          s4o.print(";\n");

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          break;

   345

        default:

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          this->current_var_type_symbol->accept(*this);

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          s4o.print(";\n");

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          break;

   349

      }

   350

    }

   351

   352

    void print_var_number(void) {

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      char str[10];

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      sprintf(str, "%d", current_var_number);

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      s4o.print(str);

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      current_var_number++;

   357

    }

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   359

    void print_step_number(void) {

   360

      char str[10];

   361

      sprintf(str, "%d", step_number);

   362

      s4o.print(str);

   363

    }

   364

   365

    void print_transition_number(void) {

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      char str[10];

   367

      sprintf(str, "%d", transition_number);

   368

      s4o.print(str);

   369

    }

   370

   371

    void print_action_number(void) {

   372

      char str[10];

   373

      sprintf(str, "%d", action_number);

   374

      s4o.print(str);

   375

    }

   376

   377

    void print_symbol_list(void) {

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      std::list<SYMBOL>::iterator pt;

   379

      for(pt = current_symbol_list.begin(); pt != current_symbol_list.end(); pt++) {

   380

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

   381

        s4o.print(".");

   382

      }

   383

    }

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

   420

/* B.1.4.3 - Declaration and initialization */

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

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   423

    /*  [variable_name] location ':' located_var_spec_init */

   424

    /* variable_name -> may be NULL ! */

   425

    //SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)

   426

    void *visit(located_var_decl_c *symbol) {

   427

        /* Start off by setting the current_var_type_symbol and

   428

         * current_var_init_symbol private variables...

   429

         */

   430

        update_var_type_symbol(symbol->located_var_spec_init);

   431

   432

        search_location_type_c search_location_type;

   433

        switch (search_location_type.get_location_type(symbol->location)) {

   434

          case search_location_type_c::input_lt:

   435

            this->current_var_class_category = located_input_vcc;

   436

            break;

   437

          case search_location_type_c::memory_lt:

   438

            this->current_var_class_category = located_memory_vcc;

   439

            break;

   440

          case search_location_type_c::output_lt:

   441

              this->current_var_class_category = located_output_vcc;

   442

              break;

   443

          default:

   444

            ERROR;

   445

            break;

   446

        }

   447

   448

        if (symbol->variable_name != NULL)

   449

          declare_variable(symbol->variable_name);

   450

        else

   451

          declare_variable(symbol->location);

   452

   453

        this->current_var_class_category = none_vcc;

   454

   455

        /* Values no longer in scope, and therefore no longer used.

   456

         * Make an effort to keep them set to NULL when not in use

   457

         * in order to catch bugs as soon as possible...

   458

         */

   459

        reset_var_type_symbol();

   460

        return NULL;

   461

    }

   462

   463

    /* variable_name incompl_location ':' var_spec */

   464

    /* variable_name -> may be NULL ! */

   465

    //SYM_REF3(incompl_located_var_decl_c, variable_name, incompl_location, var_spec)

   466

    void *visit(incompl_located_var_decl_c *symbol) {

   467

        /* Start off by setting the current_var_type_symbol and

   468

         * current_var_init_symbol private variables...

   469

         */

   470

        update_var_type_symbol(symbol->var_spec);

   471

   472

        search_location_type_c search_location_type;

   473

        switch (search_location_type.get_location_type(symbol->incompl_location)) {

   474

          case search_location_type_c::input_lt:

   475

            this->current_var_class_category = located_input_vcc;

   476

            break;

   477

          case search_location_type_c::memory_lt:

   478

            this->current_var_class_category = located_memory_vcc;

   479

            break;

   480

          case search_location_type_c::output_lt:

   481

            this->current_var_class_category = located_output_vcc;

   482

            break;

   483

          default:

   484

            ERROR;

   485

            break;

   486

        }

   487

   488

        if (symbol->variable_name != NULL)

   489

          declare_variable(symbol->variable_name);

   490

        else

   491

          declare_variable(symbol->incompl_location);

   492

   493

        this->current_var_class_category = none_vcc;

   494

   495

        /* Values no longer in scope, and therefore no longer used.

   496

        * Make an effort to keep them set to NULL when not in use