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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) 2003-2012  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

    26

#define INLINE_RESULT_TEMP_VAR "__res"

    27

#define INLINE_PARAM_COUNT "__PARAM_COUNT"

    28

    29

class generate_c_inlinefcall_c: public generate_c_base_and_typeid_c {

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    31

  public:

    32

    typedef enum {

    33

      expression_vg,

    34

      assignment_vg,

    35

      complextype_base_vg,

    36

      complextype_suffix_vg

    37

    } variablegeneration_t;

    38

    39

  private:

    40

    /* The name of the IL default variable... */

    41

    #define IL_DEFVAR   VAR_LEADER "IL_DEFVAR"

    42

    43

    /* The name of the variable used to pass the result of a

    44

     * parenthesised instruction list to the immediately preceding

    45

     * scope ...

    46

     */

    47

    #define IL_DEFVAR_BACK   VAR_LEADER "IL_DEFVAR_BACK"

    48

    il_default_variable_c implicit_variable_current;

    49

    50

    symbol_c* current_array_type;

    51

    52

    int fcall_number;

    53

    bool generating_inlinefunction;

    54

    symbol_c *fbname;

    55

    56

    search_varfb_instance_type_c *search_varfb_instance_type;

    57

    search_var_instance_decl_c   *search_var_instance_decl;

    58

    59

    variablegeneration_t wanted_variablegeneration;

    60

    61

  public:

    62

    generate_c_inlinefcall_c(stage4out_c *s4o_ptr, symbol_c *name, symbol_c *scope, const char *variable_prefix = NULL)

    63

    : generate_c_base_and_typeid_c(s4o_ptr),

    64

      implicit_variable_current(IL_DEFVAR, NULL)

    65

    {

    66

      search_varfb_instance_type = new search_varfb_instance_type_c(scope);

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      search_var_instance_decl   = new search_var_instance_decl_c  (scope);

    68

    69

      this->set_variable_prefix(variable_prefix);

    70

      fcall_number = 0;

    71

      fbname = name;

    72

      wanted_variablegeneration = expression_vg;

    73

      generating_inlinefunction = false;

    74

    }

    75

    76

    virtual ~generate_c_inlinefcall_c(void) {

    77

      delete search_varfb_instance_type;

    78

      delete search_var_instance_decl;

    79

    }

    80

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    void print(symbol_c* symbol) {

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      function_call_iterator_c fc_iterator(symbol);

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      symbol_c* function_call;

    84

      while ((function_call = fc_iterator.next()) != NULL) {

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        function_call->accept(*this);

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      }

    87

    }

    88

    89

    90

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    void generate_inline(symbol_c *function_name,

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            symbol_c *function_type_prefix,

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            symbol_c *function_type_suffix,

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            std::list<FUNCTION_PARAM*> param_list,

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            function_declaration_c *f_decl = NULL) {

    96

    97

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

    98

      generating_inlinefunction = true;

    99

   100

      fcall_number++;

   101

      function_type_prefix = default_literal_type(function_type_prefix);

   102

      if (function_type_suffix) {

   103

        function_type_suffix = default_literal_type(function_type_suffix);

   104

      }

   105

   106

      s4o.print(s4o.indent_spaces);

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      s4o.print("inline ");

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      function_type_prefix->accept(*this);

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      s4o.print(" __");

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      fbname->accept(*this);

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      s4o.print("_");

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      function_name->accept(*this);

   113

      if (f_decl != NULL) {

   114

        /* function being called is overloaded! */

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        s4o.print("__");

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        print_function_parameter_data_types_c overloaded_func_suf(&s4o);

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        f_decl->accept(overloaded_func_suf);

   118

      }

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      if (function_type_suffix) {

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        function_type_suffix->accept(*this);

   121

      }

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      s4o.print(fcall_number);

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      s4o.print("(");

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      s4o.indent_right();

   125

   126

      PARAM_LIST_ITERATOR() {

   127

        if (PARAM_DIRECTION == function_param_iterator_c::direction_in) {

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          default_literal_type(PARAM_TYPE)->accept(*this);

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          s4o.print(" ");

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          PARAM_NAME->accept(*this);

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          s4o.print(",\n" + s4o.indent_spaces);

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        }

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      }

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      fbname->accept(*this);

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      s4o.print(" *");

   136

      s4o.print(FB_FUNCTION_PARAM);

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      s4o.indent_left();

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      s4o.print(")\n" + s4o.indent_spaces);

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      s4o.print("{\n");

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      s4o.indent_right();

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   142

      s4o.print(s4o.indent_spaces);

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      function_type_prefix->accept(*this);

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      s4o.print(" "),

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      s4o.print(INLINE_RESULT_TEMP_VAR);

   146

      s4o.print(";\n");

   147

   148

      PARAM_LIST_ITERATOR() {

   149

        if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||

   150

             PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&

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             PARAM_VALUE != NULL) {

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          s4o.print(s4o.indent_spaces);

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          PARAM_TYPE->accept(*this);

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          s4o.print(" ");

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          s4o.print(TEMP_VAR);

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          PARAM_NAME->accept(*this);

   157

          s4o.print(" = ");

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          print_check_function(PARAM_TYPE, PARAM_VALUE);

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          s4o.print(";\n");

   160

          }

   161

        }

   162

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      s4o.print(s4o.indent_spaces + INLINE_RESULT_TEMP_VAR),

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      s4o.print(" = ");

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      function_name->accept(*this);

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      if (f_decl != NULL) {

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        /* function being called is overloaded! */

   168

        s4o.print("__");

   169

        print_function_parameter_data_types_c overloaded_func_suf(&s4o);

   170

        f_decl->accept(overloaded_func_suf);

   171

      }

   172

   173

      if (function_type_suffix)

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        function_type_suffix->accept(*this);

   175

      s4o.print("(");

   176

      s4o.indent_right();

   177

   178

      PARAM_LIST_ITERATOR() {

   179

        if (pt != param_list.begin())

   180

        s4o.print(",\n" + s4o.indent_spaces);

   181

        if (PARAM_DIRECTION == function_param_iterator_c::direction_in)

   182

          PARAM_NAME->accept(*this);

   183

        else if (PARAM_VALUE != NULL){

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          s4o.print("&");

   185

          s4o.print(TEMP_VAR);

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          PARAM_NAME->accept(*this);

   187

        } else {

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          s4o.print("NULL");

   189

         }

   190

      }

   191

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

   192

      s4o.indent_left();

   193

   194

      PARAM_LIST_ITERATOR() {

   195

        if ((PARAM_DIRECTION == function_param_iterator_c::direction_out ||

   196

             PARAM_DIRECTION == function_param_iterator_c::direction_inout) &&

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             PARAM_VALUE != NULL) {

   198

          s4o.print(s4o.indent_spaces);

   199

          print_setter(PARAM_VALUE, PARAM_TYPE, PARAM_NAME);

   200

          s4o.print(";\n");

   201

        }

   202

      }

   203

      s4o.print(s4o.indent_spaces + "return ");

   204

      s4o.print(INLINE_RESULT_TEMP_VAR);

   205

      s4o.print(";\n");

   206

   207

      s4o.indent_left();

   208

      s4o.print(s4o.indent_spaces + "}\n\n");

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   210

      generating_inlinefunction = false;

   211

    }

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   213

  private:

   214

    /* a small helper function */

   215

    symbol_c *default_literal_type(symbol_c *symbol) {

   216

      if (get_datatype_info_c::is_ANY_INT_literal(symbol)) {

   217

        return &get_datatype_info_c::lint_type_name;

   218

      }

   219

      else if (get_datatype_info_c::is_ANY_REAL_literal(symbol)) {

   220

        return &get_datatype_info_c::lreal_type_name;

   221

      }

   222

      return symbol;

   223

    }

   224

   225

   226

   227

    void *print_getter(symbol_c *symbol) {

   228

      unsigned int vartype = search_var_instance_decl->get_vartype(symbol);

   229

      if (vartype == search_var_instance_decl_c::external_vt) {

   230

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

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

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          s4o.print(GET_EXTERNAL_FB);

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        else

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          s4o.print(GET_EXTERNAL);

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      }

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      else if (vartype == search_var_instance_decl_c::located_vt)

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        s4o.print(GET_LOCATED);

   238

      else

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        s4o.print(GET_VAR);

   240

      s4o.print("(");

   241

   242

      wanted_variablegeneration = complextype_base_vg;

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      symbol->accept(*this);

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      s4o.print(",");

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      wanted_variablegeneration = complextype_suffix_vg;

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      symbol->accept(*this);

   247

      s4o.print(")");

   248

      wanted_variablegeneration = expression_vg;

   249

      return NULL;

   250

    }

   251

   252

    void *print_setter(symbol_c* symbol,

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                       symbol_c* type,

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                       symbol_c* value) {

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      unsigned int vartype = search_var_instance_decl->get_vartype(symbol);

   256

      if (vartype == search_var_instance_decl_c::external_vt) {

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

   258

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

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          s4o.print(SET_EXTERNAL_FB);

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         else

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          s4o.print(SET_EXTERNAL);

   262

      }

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      else if (vartype == search_var_instance_decl_c::located_vt)

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        s4o.print(SET_LOCATED);

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      else

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        s4o.print(SET_VAR);

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      s4o.print("(,");

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/*

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      wanted_variablegeneration = complextype_base_vg;

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      symbol->accept(*this);

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      s4o.print(",");

   272

      wanted_variablegeneration = expression_vg;

   273

      print_check_function(type, value, NULL, true);

   274

      if (analyse_variable_c::contains_complex_type(symbol)) {

   275

        s4o.print(",");

   276

        wanted_variablegeneration = complextype_suffix_vg;

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        symbol->accept(*this);

   278

      }

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      s4o.print(")");

   280

      wanted_variablegeneration = expression_vg;

   281

      return NULL;

   282

*/

   283

      wanted_variablegeneration = complextype_base_vg;

   284

      symbol->accept(*this);

   285

      s4o.print(",");

   286

      if (analyse_variable_c::contains_complex_type(symbol)) {

   287

        wanted_variablegeneration = complextype_suffix_vg;

   288

        symbol->accept(*this);

   289

      }

   290

      s4o.print(",");

   291

      wanted_variablegeneration = expression_vg;

   292

      print_check_function(type, value, NULL, true);

   293

      s4o.print(")");

   294

      wanted_variablegeneration = expression_vg;

   295

      return NULL;

   296

    }

   297

   298

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

   299

    /* B 1.4 - Variables */

   300

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

   301

    void *visit(symbolic_variable_c *symbol) {

   302

      unsigned int vartype;

   303

      if (generating_inlinefunction) {

   304

        if (wanted_variablegeneration == complextype_base_vg)

   305

          generate_c_base_c::visit(symbol);

   306

        else if (wanted_variablegeneration == complextype_suffix_vg)

   307

          return NULL;

   308

        else

   309

          print_getter(symbol);

   310

      }

   311

      return NULL;

   312

    }

   313

   314

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

   315

    /* B.1.4.1   Directly Represented Variables */

   316

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

   317

    // direct_variable: direct_variable_token   {$$ = new direct_variable_c($1);};

   318

    void *visit(direct_variable_c *symbol) {

   319

      TRACE("direct_variable_c");

   320

      if (generating_inlinefunction) {

   321

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

   322

        if (strlen(symbol->value) == 0) ERROR;

   323

        s4o.print(GET_LOCATED);

   324

        s4o.print("(");

   325

        this->print_variable_prefix();

   326

        s4o.printlocation(symbol->value + 1);

   327

        s4o.print(")");

   328

      }

   329

      return NULL;

   330

    }

   331

   332

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

   333

    /* B.1.4.2   Multi-element Variables */

   334

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

   335

   336

    // SYM_REF2(structured_variable_c, record_variable, field_selector)

   337

    void *visit(structured_variable_c *symbol) {

   338

      TRACE("structured_variable_c");

   339

      bool type_is_complex = analyse_variable_c::is_complex_type(symbol->record_variable);

   340

      if (generating_inlinefunction) {

   341

        switch (wanted_variablegeneration) {

   342

          case complextype_base_vg:

   343

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

   344

            if (!type_is_complex) {

   345

                s4o.print(".");

   346

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

   347

            }

   348

            break;

   349

          case complextype_suffix_vg:

   350

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

   351

            if (type_is_complex) {

   352

              s4o.print(".");

   353

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

   354

            }

   355

            break;

   356

          default:

   357

            print_getter(symbol);

   358

            break;

   359

        }

   360

      }

   361

      return NULL;

   362

    }

   363

   364

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

   365

    //SYM_REF2(array_variable_c, subscripted_variable, subscript_list)

   366

    void *visit(array_variable_c *symbol) {

   367

      if (generating_inlinefunction) {

   368

        switch (wanted_variablegeneration) {

   369

          case complextype_base_vg:

   370

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

   371

            break;

   372

          case complextype_suffix_vg:

   373

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

   374

   375

            current_array_type = search_varfb_instance_type->get_type_id(symbol->subscripted_variable);

   376

            if (current_array_type == NULL) ERROR;

   377

   378

            s4o.print(".table");

   379

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

   380

   381

            current_array_type = NULL;

   382

            break;

   383

          default:

   384

            print_getter(symbol);

   385

            break;

   386

        }

   387

      }

   388

      return NULL;

   389

    }

   390

   391

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

   392

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

   393

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

   394

   395

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

   396

    /* B 2.1 Instructions and Operands */

   397

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

   398

   399

    /* | label ':' [il_incomplete_instruction] eol_list */

   400

    // SYM_REF2(il_instruction_c, label, il_instruction)

   401

    void *visit(il_instruction_c *symbol) {

   402

      /* all previous IL instructions should have the same datatype (checked in stage3), so we get the datatype from the first previous IL instruction we find */

   403

      implicit_variable_current.datatype = (symbol->prev_il_instruction.empty())? NULL : symbol->prev_il_instruction[0]->datatype;

   404

      if (NULL != symbol->il_instruction)  symbol->il_instruction->accept(*this); 

   405

      implicit_variable_current.datatype = NULL;

   406

      return NULL;

   407

    }

   408

   409

   410

    /* | il_simple_operator [il_operand] */

   411

    //SYM_REF2(il_simple_operation_c, il_simple_operator, il_operand)

   412

    void *visit(il_simple_operation_c *symbol) {

   413

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

   414

      return NULL;

   415

    }

   416

   417

    /*  il_jump_operator label */

   418

    // SYM_REF2(il_jump_operation_c, il_jump_operator, label)    

   419

    void *visit(il_jump_operation_c *symbol) {

   420

      return NULL;

   421

    }

   422

   423

    void *visit(il_function_call_c *symbol) {

   424

      symbol_c* function_type_prefix = NULL;

   425

      symbol_c* function_name = NULL;     

   426

      symbol_c* function_type_suffix = NULL;

   427

      DECLARE_PARAM_LIST()

   428

   429

      function_call_param_iterator_c function_call_param_iterator(symbol);

   430

   431

      function_declaration_c *f_decl = (function_declaration_c *)symbol->called_function_declaration;

   432

      if (f_decl == NULL) ERROR;

   433

   434

      /* determine the base data type returned by the function being called... */

   435

      function_type_prefix = search_base_type_c::get_basetype_decl(f_decl->type_name);

   436

   437

      function_name = symbol->function_name;      

   438

   439

      /* loop through each function parameter, find the value we should pass

   440

       * to it, and then output the c equivalent...

   441

       */

   442

   443

      function_param_iterator_c fp_iterator(f_decl);

   444

      identifier_c *param_name;

   445

        /* flag to remember whether we have already used the value stored in the default variable to pass to the first parameter */

   446

      bool used_defvar = false;       

   447

        /* flag to cirreclty handle calls to extensible standard functions (i.e. functions with variable number of input parameters) */

   448

      bool found_first_extensible_parameter = false;  

   449

      for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) {

   450

        if (fp_iterator.is_extensible_param() && (!found_first_extensible_parameter)) {

   451

          /* We are calling an extensible function. Before passing the extensible

   452

           * parameters, we must add a dummy paramater value to tell the called

   453

           * function how many extensible parameters we will be passing.

   454

           *

   455

           * Note that stage 3 has already determined the number of extensible

   456

           * paramters, and stored that info in the abstract syntax tree. We simply

   457

           * re-use that value.

   458

           */

   459

          /* NOTE: we are not freeing the malloc'd memory. This is not really a bug.

   460

           *       Since we are writing a compiler, which runs to termination quickly,

   461

           *       we can consider this as just memory required for the compilation process

   462

           *       that will be free'd when the program terminates.

   463

           */

   464

          char *tmp = (char *)malloc(32); /* enough space for a call with 10^31 (larger than 2^64) input parameters! */

   465

          if (tmp == NULL) ERROR;

   466

          int res = snprintf(tmp, 32, "%d", symbol->extensible_param_count);

   467

          if ((res >= 32) || (res < 0)) ERROR;

   468

          identifier_c *param_value = new identifier_c(tmp);

   469

          uint_type_name_c *param_type  = new uint_type_name_c();

   470

          identifier_c *param_name = new identifier_c(INLINE_PARAM_COUNT);

   471

          ADD_PARAM_LIST(param_name, param_value, param_type, function_param_iterator_c::direction_in)

   472

          found_first_extensible_parameter = true;

   473

        }

   474

   475

        symbol_c *param_type = fp_iterator.param_type();

   476

        if (param_type == NULL) ERROR;

   477

   478

        function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();

   479

   480

        symbol_c *param_value = NULL;

   481

   482

        /* Get the value from a foo(<param_name> = <param_value>) style call */

   483

        /* NOTE: the following line of code is not required in this case, but it doesn't

   484

         * harm to leave it in, as in the case of a non-formal syntax function call,

   485

         * it will always return NULL.

   486

         * We leave it in in case we later decide to merge this part of the code together

   487

         * with the function calling code in generate_c_st_c, which does require

   488

         * the following line...

   489

         */

   490

        if (param_value == NULL)

   491

          param_value = function_call_param_iterator.search_f(param_name);

   492

   493

        /* if it is the first parameter in a non-formal function call (which is the