1

/*

     2

 *  matiec - a compiler for the programming languages defined in IEC 61131-3

     3

 *

     4

 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)

     5

 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant

     6

 *

     7

 *  This program is free software: you can redistribute it and/or modify

     8

 *  it under the terms of the GNU General Public License as published by

     9

 *  the Free Software Foundation, either version 3 of the License, or

    10

 *  (at your option) any later version.

    11

 *

    12

 *  This program is distributed in the hope that it will be useful,

    13

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

    14

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    15

 *  GNU General Public License for more details.

    16

 *

    17

 *  You should have received a copy of the GNU General Public License

    18

 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.

    19

 *

    20

 *

    21

 * This code is made available on the understanding that it will not be

    22

 * used in safety-critical situations without a full and competent review.

    23

 */

    24

    25

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

    26

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

    27

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

    28

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

    29

    30

/* Returns the data type of an il_operand.

    31

 *

    32

 * Note that the il_operand may be a variable, in which case

    33

 * we return the type of the variable instance.

    34

 * The il_operand may also be a constant, in which case

    35

 * we return the data type of that constant.

    36

 *

    37

 * The variable instance may be a member of a structured variable,

    38

 * or an element in an array, or any combination of the two.

    39

 *

    40

 * The class constructor must be given the search scope

    41

 * (function, function block or program within which

    42

 * the possible il_operand variable instance was declared).

    43

 */

    44

    45

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

    46

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

    47

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

    48

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

    49

    50

    51

/* A new class to ouput the IL implicit variable to c++ code

    52

 * We use this class, inheriting from symbol_c, so it may be used

    53

 * as any other symbol_c object in the intermediate parse tree,

    54

 * more specifically, so it can be used as any other il operand.

    55

 * This makes the rest of the code much easier...

    56

 *

    57

 * Nevertheless, the basic visitor class visitor_c does not know

    58

 * how to visit this new il_default_variable_c class, so we have

    59

 * to extend that too.

    60

 * In reality extending the basic symbols doesn't quite work out

    61

 * as cleanly as desired (we need to use dynamic_cast in the

    62

 * accept method of the il_default_variable_c), but it is cleaner

    63

 * than the alternative...

    64

 */

    65

class il_default_variable_c;

    66

    67

/* This visitor class is not really required, we could place the

    68

 * visit() method directly in genertae_cc_il_c, but doing it in

    69

 * a seperate class makes the architecture more evident...

    70

 */

    71

class il_default_variable_visitor_c {

    72

  public:

    73

    virtual void *visit(il_default_variable_c *symbol) = 0;

    74

    75

    virtual ~il_default_variable_visitor_c(void) {return;}

    76

};

    77

    78

    79

/* A class to print out to the resulting C++ code

    80

 * the IL implicit variable name.

    81

 *

    82

 * It includes a reference to its name,

    83

 * and the data type of the data currently stored

    84

 * in this C++ variable... This is required because the

    85

 * C++ variable is a union, and we must know which member

    86

 * of the union top reference!!

    87

 *

    88

 * Note that we also need to keep track of the data type of

    89

 * the value currently being stored in the IL implicit variable.

    90

 * This is required so we can process parenthesis,

    91

 *

    92

 * e.g. :

    93

 *         LD var1

    94

 *         AND (

    95

 *         LD var2

    96

 *         OR var3

    97

 *         )

    98

 *

    99

 * Note that we only execute the 'AND (' operation when we come across

   100

 * the ')', i.e. once we have evaluated the result of the

   101

 * instructions inside the parenthesis.

   102

 * When we do execute the 'AND (' operation, we need to know the data type

   103

 * of the operand, which in this case is the result of the evaluation of the

   104

 * instruction list inside the parenthesis. We can only know this if we

   105

 * keep track of the data type currently stored in the IL implicit variable!

   106

 *

   107

 * We use the current_type inside the generate_c_il::default_variable_name variable

   108

 * to track this!

   109

 */

   110

class il_default_variable_c: public symbol_c {

   111

  public:

   112

    symbol_c *var_name;  /* in principle, this should point to an indentifier_c */

   113

   114

  public:

   115

    il_default_variable_c(const char *var_name_str, symbol_c *current_type);

   116

    virtual void *accept(visitor_c &visitor);

   117

};

   118

   119

   120

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

   121

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

   122

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

   123

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

   124

   125

   126

   127

   128

   130

   131

  public:

   132

    typedef enum {

   133

      expression_vg,

   134

      assignment_vg,

   135

      complextype_base_vg,

   136

      complextype_base_assignment_vg,

   137

      complextype_suffix_vg,

   138

      fparam_output_vg

   139

    } variablegeneration_t;

   140

   141

  private:

   142

    /* Label to which the current IL jump operation should jump to... */

   143

    /* This variable is used to pass data from the

   144

     * il_jump_operation_c visitor

   145

     * to the il jump operator visitors (i.e. JMP_operator_c,

   146

     * JMPC_operator_c, JMPCN_operator_c, ...)

   147

     */

   148

    symbol_c *jump_label;

   149

   150

    /* the data type of the IL implicit variable... */

   151

    #define IL_DEFVAR_T VAR_LEADER "IL_DEFVAR_T"

   152

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

   153

    #define IL_DEFVAR   VAR_LEADER "IL_DEFVAR"

   154

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

   155

     * parenthesised instruction list to the immediately preceding

   156

     * scope ...

   157

     */

   158

    #define IL_DEFVAR_BACK   VAR_LEADER "IL_DEFVAR_BACK"

   159

   160

    il_default_variable_c implicit_variable_current;      /* the current   implicit variable, with the datatype resulting from the previous IL operation */

   161

    il_default_variable_c implicit_variable_result;       /* the resulting implicit variable, with the datatype resulting from the current  IL operation */

   162

    il_default_variable_c implicit_variable_result_back;

   163

   164

    /* Operand to the IL operation currently being processed... */

   165

    /* These variables are used to pass data from the

   166

     * il_simple_operation_c and il_expression_c visitors

   167

     * to the il operator visitors (i.e. LD_operator_c,

   168

     * LDN_operator_c, ST_operator_c, STN_operator_c, ...)

   169

     */

   170

    symbol_c *current_operand;

   171

   172

    /* When calling a function block, we must first find it's type,

   173

     * by searching through the declarations of the variables currently

   174

     * in scope.

   175

     * This class does just that...

   176

     * A new class is instantiated whenever we begin generating the code

   177

     * for a function block type declaration, or a program declaration.

   178

     * This object instance will then later be called while the

   179

     * function block's or the program's body is being handled.

   180

     *

   181

     * Note that functions cannot contain calls to function blocks,

   182

     * so we do not create an object instance when handling

   183

     * a function declaration.

   184

     */

   185

    search_fb_instance_decl_c *search_fb_instance_decl;

   186

   187

    search_varfb_instance_type_c *search_varfb_instance_type;

   188

    search_var_instance_decl_c   *search_var_instance_decl;

   189

   190

    symbol_c* current_array_type;

   191

    symbol_c* current_param_type;

   192

   193

    int fcall_number;

   194

    symbol_c *fbname;

   195

   196

    variablegeneration_t wanted_variablegeneration;

   197

   198

  public:

   199

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

   201

      implicit_variable_current    (IL_DEFVAR,      NULL),

   202

      implicit_variable_result     (IL_DEFVAR,      NULL),

   203

      implicit_variable_result_back(IL_DEFVAR_BACK, NULL)

   204

    {

   205

      search_fb_instance_decl    = new search_fb_instance_decl_c   (scope);

   206

      search_varfb_instance_type = new search_varfb_instance_type_c(scope);

   207

      search_var_instance_decl   = new search_var_instance_decl_c  (scope);

   208

   209

      current_operand = NULL;

   210

      current_array_type = NULL;

   211

      current_param_type = NULL;

   212

      fcall_number = 0;

   213

      fbname = name;

   214

      wanted_variablegeneration = expression_vg;

   215

      this->set_variable_prefix(variable_prefix);

   216

    }

   217

   218

    virtual ~generate_c_il_c(void) {

   219

      delete search_fb_instance_decl;

   220

      delete search_varfb_instance_type;

   221

      delete search_var_instance_decl;

   222

    }

   223

   224

    void generate(instruction_list_c *il) {

   225

      il->accept(*this);

   226

    }

   227

   228

  private:

   229

    /* Declare an implicit IL variable... */

   230

    void declare_implicit_variable(il_default_variable_c *implicit_var) {

   231

      s4o.print(s4o.indent_spaces);

   232

      s4o.print(IL_DEFVAR_T);

   233

      s4o.print(" ");

   234

      implicit_var->datatype = NULL;

   235

      implicit_var->accept(*this);

   236

      s4o.print(";\n");

   237

    }

   238

   239

  public:  

   240

    /* Declare the default variable, that will store the result of the IL operations */

   241

    void declare_implicit_variable(void) {

   242

      declare_implicit_variable(&this->implicit_variable_result);

   243

    }

   244

   245

    /* Declare the backup to the default variable, that will store the result of the IL operations executed inside a parenthesis... */

   246

    void declare_implicit_variable_back(void) {

   247

      declare_implicit_variable(&this->implicit_variable_result_back);

   248

    }

   249

   250

    void print_implicit_variable_back(void) {

   251

      this->implicit_variable_result_back.accept(*this);

   252

    }    

   253

   254

   255

  private:

   256

    /* a small helper function */

   257

    symbol_c *default_literal_type(symbol_c *symbol) {

   258

      if (get_datatype_info_c::is_ANY_INT_literal(symbol)) {

   259

        return &get_datatype_info_c::lint_type_name;

   260

      }

   261

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

   262

        return &get_datatype_info_c::lreal_type_name;

   263

      }

   264

      return symbol;

   265

    }

   266

   267

    /* A helper function... */

   268

    void *XXX_operator(symbol_c *lo, const char *op, symbol_c *ro) {

   269

      if ((NULL == lo) || (NULL == ro) || (NULL == op)) ERROR;

   270

   271

      lo->accept(*this);

   272

      s4o.print(op);

   273

      ro->accept(*this);

   274

      return NULL;

   275

    }

   276

   277

    /* A helper function... */

   278

    void *XXX_function(symbol_c *res, const char *func, symbol_c *lo, symbol_c *ro) {

   279

      if ((NULL == res) || (NULL == lo) || (NULL == ro)) ERROR;

   280

      if  (NULL == func) ERROR;

   281

   282

      res->accept(*this);

   283

      s4o.print(" = ");

   284

      s4o.print(func);

   285

      s4o.print("(");

   286

      lo->accept(*this);

   287

      s4o.print(", ");

   288

      ro->accept(*this);

   289

      s4o.print(")");

   290

      return NULL;

   291

    }

   292

   293

    /* A helper function... used for implicit FB calls: S1, R1, CLK, CU, CD, PV, IN, and PT */

   294

    void *XXX_CAL_operator(const char *param_name, symbol_c *fb_name) {

   295

      if (wanted_variablegeneration != expression_vg) {

   296

        s4o.print(param_name);

   297

        return NULL;

   298

      }

   299

   300

      if (NULL == fb_name) ERROR;

   301

      symbolic_variable_c *sv = dynamic_cast<symbolic_variable_c *>(fb_name);

   302

      if (NULL == sv) ERROR;

   303

      identifier_c *id = dynamic_cast<identifier_c *>(sv->var_name);

   304

      if (NULL == id) ERROR;

   305

   306

      identifier_c param(param_name);

   307

   308

      //SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)

   309

      il_assign_operator_c il_assign_operator(&param);

   310

      il_param_assignment_c il_param_assignment(&il_assign_operator, &this->implicit_variable_current, NULL);

   311

      // SYM_LIST(il_param_list_c)

   312

      il_param_list_c il_param_list;   

   313

      il_param_list.add_element(&il_param_assignment);

   314

      CAL_operator_c CAL_operator;

   315

      // SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list)

   316

      il_fb_call_c il_fb_call(&CAL_operator, id, NULL, &il_param_list);

   317

   318

      il_fb_call.accept(*this);

   319

      return NULL;

   320

    }

   321

   322

    /* A helper function... */

   323

    void *CMP_operator(symbol_c *operand, const char *operation) {

   324

      if (NULL == operand) ERROR;

   325

      if (NULL == operand->datatype) ERROR;

   326

      if (NULL == this->implicit_variable_current.datatype) ERROR;

   327

   328

      this->implicit_variable_result.accept(*this);

   329

      s4o.print(" = ");

   330

      s4o.print(operation);

   331

      operand->datatype->accept(*this);

   332

      /* NOTE: we are calling a standard Function: 

   333

       *         1st parameter: EN  (enable)

   334

       *         2nd parameter: ENO (enable output)

   335

       *         3rd parameter: number of operands we will be passing (required because we are calling an extensible standard function!)

   336

       *         4th parameter: the left  hand side of the comparison expression (in out case, the IL implicit variable)

   337

       *         4th parameter: the right hand side of the comparison expression (in out case, current operand)

   338

       */

   339

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

   340

      this->implicit_variable_current.accept(*this);

   341

      s4o.print(", ");

   342

      operand->accept(*this);

   343

      s4o.print(")");

   344

   345

      return NULL;

   346

    }

   347

   348

   349

    /* A helper function... */

   350

    void C_modifier(void) {

   351

      if (!get_datatype_info_c::is_BOOL_compatible(implicit_variable_current.datatype)) ERROR;

   352

      s4o.print("if (");

   353

      this->implicit_variable_current.accept(*this);

   354

      s4o.print(") ");

   355

    }

   356

   357

    /* A helper function... */

   358

    void CN_modifier(void) {

   359

      if (!get_datatype_info_c::is_BOOL_compatible(implicit_variable_current.datatype)) ERROR;

   360

      s4o.print("if (!");

   361

      this->implicit_variable_current.accept(*this);

   362

      s4o.print(") ");

   363

    }

   364

   365

   366

    void *print_getter(symbol_c *symbol) {

   367

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

   368

      if (wanted_variablegeneration == fparam_output_vg) {

   369

        if (vartype == search_var_instance_decl_c::external_vt) {

   370

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

   371

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

   372

            s4o.print(GET_EXTERNAL_FB_BY_REF);

   373

          else

   374

            s4o.print(GET_EXTERNAL_BY_REF);

   375

        }

   376

        else if (vartype == search_var_instance_decl_c::located_vt)

   377

          s4o.print(GET_LOCATED_BY_REF);

   378

        else

   379

          s4o.print(GET_VAR_BY_REF);

   380

      }

   381

      else {

   382

        if (vartype == search_var_instance_decl_c::external_vt) {

   383

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

   384

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

   385

            s4o.print(GET_EXTERNAL_FB);

   386

          else

   387

            s4o.print(GET_EXTERNAL);

   388

        }

   389

        else if (vartype == search_var_instance_decl_c::located_vt)

   390

          s4o.print(GET_LOCATED);

   391

        else

   392

          s4o.print(GET_VAR);

   393

      }

   394

      s4o.print("(");

   395

   396

      variablegeneration_t old_wanted_variablegeneration = wanted_variablegeneration;

   397

      wanted_variablegeneration = complextype_base_vg;

   398

      symbol->accept(*this);

   399

      s4o.print(",");

   400

      wanted_variablegeneration = complextype_suffix_vg;

   401

      symbol->accept(*this);

   402

      s4o.print(")");

   403

      wanted_variablegeneration = old_wanted_variablegeneration;

   404

      return NULL;

   405

    }

   406

   407

    void *print_setter(symbol_c* symbol,

   408

            symbol_c* type,

   409

            symbol_c* value,

   410

            symbol_c* fb_symbol = NULL,

   411

            symbol_c* fb_value = NULL,

   412

            bool negative = false) {

   413

   414

      bool type_is_complex = false;

   415

      if (fb_symbol == NULL) {

   416

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

   417

        type_is_complex = analyse_variable_c::contains_complex_type(symbol);

   418

        if (vartype == search_var_instance_decl_c::external_vt) {

   419

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

   420

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

   421

            s4o.print(SET_EXTERNAL_FB);

   422

          else

   423

            s4o.print(SET_EXTERNAL);

   424

        }

   425

        else if (vartype == search_var_instance_decl_c::located_vt)

   426

          s4o.print(SET_LOCATED);

   427

        else

   428

          s4o.print(SET_VAR);

   429

      }

   430

      else {

   431

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

   432

        if (vartype == search_var_instance_decl_c::external_vt)

   433

          s4o.print(SET_EXTERNAL_FB);

   434

        else

   435

          s4o.print(SET_VAR);

   436

      }

   437

      s4o.print("(");

   438

   439

      if (fb_symbol != NULL) {

   440

        print_variable_prefix();

   441

        fb_symbol->accept(*this);

   442

        s4o.print(".,");

   443

      }

   444

      else if (type_is_complex)

   445

        wanted_variablegeneration = complextype_base_assignment_vg;

   446

      else

   447

        wanted_variablegeneration = assignment_vg;

   448

      symbol->accept(*this);

   449

/*

   450

      s4o.print(",");

   451

      if (negative) {

   452

        if (get_datatype_info_c::is_BOOL_compatible(this->current_operand->datatype))

   453

          s4o.print("!");

   454

        else

   455

          s4o.print("~");

   456

      }

   457

      wanted_variablegeneration = expression_vg;

   458

      print_check_function(type, value, fb_value);

   459

      if (type_is_complex) {

   460

        s4o.print(",");

   461

        wanted_variablegeneration = complextype_suffix_vg;

   462

        symbol->accept(*this);

   463

      }

   464

      s4o.print(")");

   465

      wanted_variablegeneration = expression_vg;

   466

      return NULL;

   467

*/

   468

      s4o.print(",");

   469

      if (type_is_complex) {

   470

        wanted_variablegeneration = complextype_suffix_vg;

   471

        symbol->accept(*this);

   472

      }

   473

      s4o.print(",");

   474

      if (negative) {

   475

        if (get_datatype_info_c::is_BOOL_compatible(this->current_operand->datatype))

   476

          s4o.print("!");

   477

        else

   478

          s4o.print("~");

   479

      }

   480

      wanted_variablegeneration = expression_vg;

   481

      print_check_function(type, value, fb_value);

   482

      s4o.print(")");

   483

      wanted_variablegeneration = expression_vg;

   484

      return NULL;

   485

    }

   486

   487

public:

   488

void *visit(il_default_variable_c *symbol) {

   489

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

   490

  if (NULL != symbol->datatype) {

   491

    s4o.print(".");

   492

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

   493

    s4o.print("var");

   494

  } return NULL;

   495

}

   496

   497

   498

private:

   499

   500

   501