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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);

    55

      if (current_location_type == none_lt) ERROR;

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      return current_location_type;

    57

    }

    58

    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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    71

    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:

    97

    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

   103

    } 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_base_type_c search_base_type;

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    search_fb_typedecl_c *search_fb_typedecl;

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  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);

   116

    }

   117

   118

    virtual ~search_type_symbol_c(void) {

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      delete search_fb_typedecl;

   120

    }

   121

   122

    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;

   126

   127

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

   128

      if (var_type_symbol == NULL) {

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        var_type_symbol = symbol;

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      }

   131

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      var_type_symbol->accept(*this);

   133

   134

      if (this->current_var_type_symbol == NULL)

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    	this->current_var_type_symbol = var_type_symbol;

   136

   137

      return (this->current_var_type_symbol);

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    }

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   140

    symbol_c *get_current_type_name(void) {

   141

      if (this->current_var_type_name == NULL)

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    	return (this->current_var_type_symbol);

   143

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      return (this->current_var_type_name);

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    }

   146

   147

    void *visit(identifier_c* symbol) {

   148

      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);

   152

        if (this->current_var_type_symbol != NULL)

   153

          this->current_var_type_category = function_block_vtc;

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   155

        else {

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          this->current_var_type_symbol = (symbol_c *)(this->current_var_type_name->accept(search_base_type));

   157

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

   158

        }

   159

      }

   160

      return NULL;

   161

    }

   162

   163

    void *visit(array_specification_c* symbol) {

   164

      this->current_var_type_category = array_vtc;

   165

   166

      if (this->current_var_type_name == NULL)

   167

        this->current_var_type_name = symbol->non_generic_type_name;

   168

   169

      return NULL;

   170

    }

   171

   172

    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;

   175

    }

   176

   177

};

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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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   190

  public:

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    typedef struct

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    {

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      symbol_c *symbol;

   194

    } SYMBOL;

   195

   196

    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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   202

    declarationtype_t current_declarationtype;

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   204

    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,

   210

    } 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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   225

  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;

   233

      current_var_class_category = none_vcc;

   234

    }

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    ~generate_var_list_c(void) {

   237

      delete search_type_symbol;

   238

    }

   239

   240

    void update_var_type_symbol(symbol_c *symbol) {

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

   242

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

   243

    }

   244

   245

    void reset_var_type_symbol(void) {

   246

      this->current_var_type_symbol = NULL;

   247

    }

   248

   249

    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;

   256

      s4o.print("\n");

   257

    }

   258

   259

    void generate_variables(symbol_c *symbol) {

   260

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

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      current_var_number = 0;

   262

      configuration_defined = false;

   263

      current_declarationtype = variables_dt;

   264

      symbol->accept(*this);

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      current_declarationtype = none_dt;

   266

      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;

   273

   274

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

   275

        declare_variable(list->elements[i]);

   276

      }

   277

    }

   278

   279

    void declare_variable(symbol_c *symbol) {

   280

      // Arrays and structures are not supported in debugging

   281

      switch (search_type_symbol->current_var_type_category) {

   282

          case search_type_symbol_c::array_vtc:

   283

          case search_type_symbol_c::structure_vtc:

   284

          return;

   285

          default:

   286

           break;

   287

      }

   288

      print_var_number();

   289

      s4o.print(";");

   290

      switch (search_type_symbol->current_var_type_category) {

   291

        case search_type_symbol_c::array_vtc:

   292

          s4o.print("ARRAY");

   293

          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");

   299

          break;

   300

        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;

   308

            case located_memory_vcc:

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             s4o.print("MEM");

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             break;

   311

            case located_output_vcc:

   312

             s4o.print("OUT");

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             break;

   314

            default:

   315

             s4o.print("VAR");

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             break;

   317

          }

   318

          break;

   319

      }

   320

      s4o.print(";");

   321

      print_symbol_list();

   322

      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(";");

   327

      switch (search_type_symbol->current_var_type_category) {

   328

        case search_type_symbol_c::structure_vtc:

   329

        case search_type_symbol_c::function_block_vtc:

   330

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

   331

          s4o.print(";\n");

   332

          SYMBOL *current_name;

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          current_name = new SYMBOL;

   334

          current_name->symbol = symbol;

   335

          current_symbol_list.push_back(*current_name);

   336

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

   337

          current_symbol_list.pop_back();

   338

          break;

   339

        case search_type_symbol_c::array_vtc:

   340

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

   341

          s4o.print(";\n");

   342

          break;

   343

        default:

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

   345

          s4o.print(";\n");

   346

          break;

   347

      }

   348

    }

   349

   350

    void print_var_number(void) {

   351

      char str[10];

   352

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

   353

      s4o.print(str);

   354

      current_var_number++;

   355

    }

   356

   357

    void print_step_number(void) {

   358

      char str[10];

   359

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

   360

      s4o.print(str);

   361

    }

   362

   363

    void print_transition_number(void) {

   364

      char str[10];

   365

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

   366

      s4o.print(str);

   367

    }

   368

   369

    void print_action_number(void) {

   370

      char str[10];

   371

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

   372

      s4o.print(str);

   373

    }

   374

   375

    void print_symbol_list(void) {

   376

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

   377

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

   378

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

   379

        s4o.print(".");

   380

      }

   381

    }

   382

   383

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

   384

/* B.1.4.3 - Declaration and initialization */

   385

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

   386

   387

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

   388

    /* variable_name -> may be NULL ! */

   389

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

   390

    void *visit(located_var_decl_c *symbol) {

   391

        /* Start off by setting the current_var_type_symbol and

   392

         * current_var_init_symbol private variables...

   393

         */

   394

        update_var_type_symbol(symbol->located_var_spec_init);

   395

   396

        search_location_type_c search_location_type;

   397

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

   398

          case search_location_type_c::input_lt:

   399

            this->current_var_class_category = located_input_vcc;

   400

            break;

   401

          case search_location_type_c::memory_lt:

   402

            this->current_var_class_category = located_memory_vcc;

   403

            break;

   404

          case search_location_type_c::output_lt:

   405

              this->current_var_class_category = located_output_vcc;

   406

              break;

   407

          default:

   408

            ERROR;

   409

            break;

   410

        }

   411

   412

        if (symbol->variable_name != NULL)

   413

          declare_variable(symbol->variable_name);

   414

        else

   415

          declare_variable(symbol->location);

   416

   417

        this->current_var_class_category = none_vcc;

   418

   419

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

   420

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

   421

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

   422

         */

   423

        reset_var_type_symbol();

   424

        return NULL;

   425

    }

   426

   427

    /* variable_name incompl_location ':' var_spec */

   428

    /* variable_name -> may be NULL ! */

   429

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

   430

    void *visit(incompl_located_var_decl_c *symbol) {

   431

        /* Start off by setting the current_var_type_symbol and

   432

         * current_var_init_symbol private variables...

   433

         */

   434

        update_var_type_symbol(symbol->var_spec);

   435

   436

        search_location_type_c search_location_type;

   437

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

   438

          case search_location_type_c::input_lt:

   439

            this->current_var_class_category = located_input_vcc;

   440

            break;

   441

          case search_location_type_c::memory_lt:

   442

            this->current_var_class_category = located_memory_vcc;

   443

            break;

   444

          case search_location_type_c::output_lt:

   445

            this->current_var_class_category = located_output_vcc;

   446

            break;

   447

          default:

   448

            ERROR;

   449

            break;

   450

        }

   451

   452

        if (symbol->variable_name != NULL)

   453

          declare_variable(symbol->variable_name);

   454

        else

   455

          declare_variable(symbol->incompl_location);

   456

   457

        this->current_var_class_category = none_vcc;

   458

   459

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

   460

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

   461

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

   462

        */

   463

       reset_var_type_symbol();

   464

        return NULL;

   465

    }

   466

   467

    /*  var1_list ':' array_spec_init */

   468

    // SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)

   469

    void *visit(array_var_init_decl_c *symbol) {

   470

      TRACE("array_var_init_decl_c");

   471

      /* Start off by setting the current_var_type_symbol and

   472

       * current_var_init_symbol private variables...

   473

       */

   474

      update_var_type_symbol(symbol->array_spec_init);

   475

   476

      declare_variables(symbol->var1_list);

   477

   478

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

   479

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

   480

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

   481

       */

   482

      reset_var_type_symbol();

   483

   484

      return NULL;

   485

    }

   486

   487

    /*  var1_list ':' initialized_structure */

   488

    // SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)

   489

    void *visit(structured_var_init_decl_c *symbol) {

   490

      TRACE("structured_var_init_decl_c");

   491

      /* Please read the comments inside the var1_init_decl_c

   492

       * visitor, as they apply here too.

   493

       */

   494

   495

      /* Start off by setting the current_var_type_symbol and

   496

       * current_var_init_symbol private variables...

   497

       */

   498

      update_var_type_symbol(symbol->initialized_structure);