1

/*

     2

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

     3

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

     4

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

     5

 *

     6

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

     7

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

     8

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

     9

 *  (at your option) any later version.

    10

 *

    11

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

    12

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

    13

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    14

 *  GNU General Public License for more details.

    15

 *

    16

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

    17

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

    18

 *

    19

 *

    20

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

    21

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

    22

 */

    23

    24

/*

    25

 * An IEC 61131-3 compiler.

    26

 *

    27

 * Based on the

    28

 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)

    29

 *

    30

 */

    31

    32

/*

    33

 * Declaration of the Abstract Syntax data structure components

    34

 */

    35

    36

/*

    37

 * ABSYNTAX.H

    38

 *

    39

 * This generates the parse tree structure used to bind the components

    40

 * identified by Bison in the correct syntax order. At the end of the

    41

 * Bison analysis the tree is walked in a sequential fashion generating

    42

 * the relavent code.

    43

 */

    44

    45

#ifndef _ABSYNTAX_HH

    46

#define _ABSYNTAX_HH

    47

    48

    49

#include <stdio.h> // required for NULL

    50

#include <vector>

    51

#include <map>

    52

#include <string>

    53

#include <stdint.h>  // required for uint64_t, etc...

    54

#include "../main.hh" // required for uint8_t, real_64_t, ..., and the macros INT8_MAX, REAL32_MAX, ... */

    55

    56

    57

    58

    59

/* Forward declaration of the visitor interface

    60

 * declared in the visitor.hh file

    61

 * We cannot include the visitor.hh file, as it will

    62

 * include this same file first, as it too requires references

    63

 * to the abstract syntax classes defined here.

    64

 */

    65

class visitor_c; // forward declaration

    66

    67

    68

class symbol_c; // forward declaration

    69

    70

    71

    72

    73

    74

    75

    76

/* Case insensitive string compare */

    77

  /* Case insensitive string compare copied from

    78

   * "The C++ Programming Language" - 3rd Edition

    79

   * by Bjarne Stroustrup, ISBN 0201889544.

    80

   */

    81

class nocasecmp_c {

    82

    public:

    83

      bool operator() (const std::string& x, const std::string& y) const {

    84

        std::string::const_iterator ix = x.begin();

    85

        std::string::const_iterator iy = y.begin();

    86

    87

        for(; (ix != x.end()) && (iy != y.end()) && (toupper(*ix) == toupper(*iy)); ++ix, ++iy);

    88

        if (ix == x.end()) return (iy != y.end());

    89

        if (iy == y.end()) return false;

    90

        return (toupper(*ix) < toupper(*iy));

    91

      };

    92

  };

    93

    94

    95

    96

/*** constant folding ***/

    97

/* During stage 3 (semantic analysis/checking) we will be doing constant folding.

    98

 * That algorithm will anotate the abstract syntax tree with the result of operations

    99

 * on literals (i.e. 44 + 55 will store the result 99).

   100

 * Since the same source code (e.g. 1 + 0) may actually be a BOOL or an ANY_INT,

   101

 * or an ANY_BIT, we need to handle all possibilities, and determine the result of the

   102

 * operation assuming each type.

   103

 * For this reason, we have one entry for each possible type, with some expressions

   104

 * having more than one entry filled in!

   105

 */    

   106

class const_value_c {

   107

  public:

   108

    typedef enum { cs_undefined,   /* not defined/not yet evaluated --> const_value is not valid! */

   109

                   cs_non_const,   /* we have determined that expression is not a const value --> const_value is not valid! */

   110

                   cs_const_value, /* const value is valid */

   111

                   cs_overflow     /* result produced overflow or underflow --> const_value is not valid! */

   112

                 } const_status_t;

   113

   114

    template<typename value_type> class const_value__ {

   115

      const_status_t status;  

   116

      value_type     value;

   117

   118

      public:

   119

      const_value__(void): status(cs_undefined), value(0) {};

   120

   121

      value_type get(void)              {return value;}

   122

      void       set(value_type value_) {status = cs_const_value; value = value_;}

   123

      void       set_overflow(void)     {status = cs_overflow   ;}

   124

      void       set_nonconst(void)     {status = cs_non_const  ;}

   125

      bool       is_valid    (void)     {return (status == cs_const_value);}

   126

      bool       is_overflow (void)     {return (status == cs_overflow   );}

   127

      bool       is_nonconst (void)     {return (status == cs_non_const  );}

   128

      bool       is_zero     (void)     {return (is_valid() && (get() == 0));}

   129

    };

   130

   131

    const_value__< int64_t>  _int64; /* status is initialised to UNDEFINED */

   132

    const_value__<uint64_t> _uint64; /* status is initialised to UNDEFINED */

   133

    const_value__<real64_t> _real64; /* status is initialised to UNDEFINED */

   134

    const_value__<bool    >   _bool; /* status is initialised to UNDEFINED */

   135

   136

    /* default constructor and destructor */

   137

     const_value_c(void) {};

   138

    ~const_value_c(void) {};

   139

};

   140

   141

   142

   143

/* The base class of all symbols */

   144

class symbol_c {

   145

   146

  public:

   147

    /* WARNING: only use this method for debugging purposes!! */

   148

    virtual const char *absyntax_cname(void) {return "symbol_c";};

   149

   150

    /*

   151

     * Annotations produced during stage 1_2

   152

     */    

   153

    /* Points to the parent symbol in the AST, i.e. the symbol in the AST that will contain the current symbol */

   154

    symbol_c *parent; 

   155

   156

    /* Line number for the purposes of error checking.  */

   157

    int first_line;

   158

    int first_column;

   159

    const char *first_file;  /* filename referenced by first line/column */

   160

    long int first_order;    /* relative order in which it is read by lexcial analyser */

   161

    int last_line;

   162

    int last_column;

   163

    const char *last_file;  /* filename referenced by last line/column */

   164

    long int last_order;    /* relative order in which it is read by lexcial analyser */

   165

   166

   167

    /*

   168

     * Annotations produced during stage 3

   169

     */    

   170

    /*** Data type analysis ***/

   171

    std::vector <symbol_c *> candidate_datatypes; /* All possible data types the expression/literal/etc. may take. Filled in stage3 by fill_candidate_datatypes_c class */

   172

    /* Data type of the expression/literal/etc. Filled in stage3 by narrow_candidate_datatypes_c 

   173

     * If set to NULL, it means it has not yet been evaluated.

   174

     * If it points to an object of type invalid_type_name_c, it means it is invalid.

   175

     * Otherwise, it points to an object of the apropriate data type (e.g. int_type_name_c, bool_type_name_c, ...)

   176

     */

   177

    symbol_c *datatype;

   178

    /* The POU in which the symbolic variable (or structured variable, or array variable, or located variable, - any more?)

   179

     * was declared. This will point to a Configuration, Resource, Program, FB, or Function.

   180

     * This is set in stage 3 by the datatype analyser algorithm (fill/narrow) for the symbols:

   181

     *  symbolic_variable_c, array_variable_c, structured_variable_c

   182

     */

   183

    symbol_c *scope;    

   184

   185

    /*** constant folding ***/

   186

    /* If the symbol has a constant numerical value, this will be set to that value by constant_folding_c */

   187

    const_value_c const_value;

   188

   189

    /*** Enumeration datatype checking ***/    

   190

    /* Not all symbols will contain the following anotations, which is why they are not declared here in symbol_c

   191

     * They will be declared only inside the symbols that require them (have a look at absyntax.def)

   192

     */

   193

    typedef std::multimap<std::string, symbol_c *, nocasecmp_c> enumvalue_symtable_t;

   194

   195

    /*

   196

     * Annotations produced during stage 4

   197

     */

   198

    /* Since we support several distinct stage_4 implementations, having explicit entries for each

   199

     * possible use would quickly get out of hand.

   200

     * We therefore simply add a map, that each stage 4 may use for all its needs.

   201

     */

   202

    typedef std::map<std::string, symbol_c *> anotations_map_t;

   203

    anotations_map_t anotations_map;

   204

   205

   206

  public:

   207

    /* default constructor */

   208

    symbol_c(int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */

   209

             int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0  /* order in which it is read by lexcial analyser */

   210

            );

   211

   212

    /* default destructor */

   213

    /* must be virtual so compiler does not complain... */ 

   214

    virtual ~symbol_c(void) {return;};

   215

   216

    virtual void *accept(visitor_c &visitor) {return NULL;};

   217

};

   218

   219

   220

   221

   222

class token_c: public symbol_c {

   223

  public:

   224

    /* WARNING: only use this method for debugging purposes!! */

   225

    virtual const char *absyntax_cname(void) {return "token_c";};

   226

   227

    /* the value of the symbol. */

   228

    const char *value;

   229

   230

  public:

   231

    token_c(const char *value, 

   232

            int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */

   233

            int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0  /* order in which it is read by lexcial analyser */

   234

           );

   235

};

   236

   237

   238

   239

   240

 /* a list of symbols... */

   241

class list_c: public symbol_c {

   242

  public:

   243

    /* WARNING: only use this method for debugging purposes!! */

   244

    virtual const char *absyntax_cname(void) {return "list_c";};

   245

   246

    int c,n; /* c: current capacity of list (malloc'd memory);  n: current number of elements in list */

   247

    symbol_c **elements;

   248

   249

  public:

   250

    list_c(int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */

   251

           int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0  /* order in which it is read by lexcial analyser */

   252

          );

   253

   254

    list_c(symbol_c *elem, 

   255

           int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0, /* order in which it is read by lexcial analyser */

   256

           int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0  /* order in which it is read by lexcial analyser */

   257

          );

   258

     /* append a new element to the end of the list */

   259

    virtual void add_element(symbol_c *elem);

   260

     /* insert a new element before position pos. */

   261

     /* To insert into the begining of list, call with pos=0  */

   262

     /* To insert into the end of list, call with pos=list->n */

   263

    virtual void insert_element(symbol_c *elem, int pos = 0);

   264

     /* remove element at position pos. */

   265

    virtual void remove_element(int pos = 0);

   266

     /* remove all elements from list. Does not delete the elements in the list! */ 

   267

    virtual void clear(void);

   268

};

   269

   270

   271

   272

   273

   274

   275

   276

   277

   278

#define SYM_LIST(class_name_c, ...)											\

   279

class class_name_c:	public list_c {											\

   280

  public:														\

   281

    __VA_ARGS__														\

   282

  public:														\

   283

    class_name_c(													\

   284

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   285

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   286

    class_name_c(symbol_c *elem, 											\

   287

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   288

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   289

    virtual void *accept(visitor_c &visitor);										\

   290

    /* WARNING: only use this method for debugging purposes!! */							\

   291

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   292

};

   293

   294

   295

#define SYM_TOKEN(class_name_c, ...)											\

   296

class class_name_c: 	public token_c {										\

   297

  public:														\

   298

    __VA_ARGS__														\

   299

  public:														\

   300

    class_name_c(const char *value, 											\

   301

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   302

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   303

    virtual void *accept(visitor_c &visitor);										\

   304

    /* WARNING: only use this method for debugging purposes!! */							\

   305

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   306

};

   307

   308

   309

#define SYM_REF0(class_name_c, ...)											\

   310

class class_name_c: public symbol_c {											\

   311

  public:														\

   312

    __VA_ARGS__														\

   313

  public:														\

   314

    class_name_c(		 											\

   315

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   316

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   317

    virtual void *accept(visitor_c &visitor);										\

   318

    /* WARNING: only use this method for debugging purposes!! */							\

   319

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   320

};

   321

   322

   323

#define SYM_REF1(class_name_c, ref1, ...)										\

   324

class class_name_c: public symbol_c {											\

   325

  public:														\

   326

    symbol_c *ref1;													\

   327

    __VA_ARGS__														\

   328

  public:														\

   329

    class_name_c(symbol_c *ref1,											\

   330

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   331

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   332

    virtual void *accept(visitor_c &visitor);										\

   333

    /* WARNING: only use this method for debugging purposes!! */							\

   334

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   335

};

   336

   337

   338

#define SYM_REF2(class_name_c, ref1, ref2, ...)										\

   339

class class_name_c: public symbol_c {											\

   340

  public:														\

   341

    symbol_c *ref1;													\

   342

    symbol_c *ref2;													\

   343

    __VA_ARGS__														\

   344

  public:														\

   345

    class_name_c(symbol_c *ref1,											\

   346

		 symbol_c *ref2 = NULL,											\

   347

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   348

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   349

    virtual void *accept(visitor_c &visitor);										\

   350

    /* WARNING: only use this method for debugging purposes!! */							\

   351

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   352

};

   353

   354

   355

#define SYM_REF3(class_name_c, ref1, ref2, ref3, ...)									\

   356

class class_name_c: public symbol_c {											\

   357

  public:														\

   358

    symbol_c *ref1;													\

   359

    symbol_c *ref2;													\

   360

    symbol_c *ref3;													\

   361

    __VA_ARGS__														\

   362

  public:														\

   363

    class_name_c(symbol_c *ref1,											\

   364

		 symbol_c *ref2,											\

   365

		 symbol_c *ref3,											\

   366

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   367

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   368

    virtual void *accept(visitor_c &visitor);										\

   369

    /* WARNING: only use this method for debugging purposes!! */							\

   370

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   371

};

   372

   373

   374

#define SYM_REF4(class_name_c, ref1, ref2, ref3, ref4, ...)								\

   375

class class_name_c: public symbol_c {											\

   376

  public:														\

   377

    symbol_c *ref1;													\

   378

    symbol_c *ref2;													\

   379

    symbol_c *ref3;													\

   380

    symbol_c *ref4;													\

   381

    __VA_ARGS__														\

   382

  public:														\

   383

    class_name_c(symbol_c *ref1,											\

   384

		 symbol_c *ref2,											\

   385

		 symbol_c *ref3,											\

   386

		 symbol_c *ref4 = NULL,											\

   387

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   388

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   389

    virtual void *accept(visitor_c &visitor);										\

   390

    /* WARNING: only use this method for debugging purposes!! */							\

   391

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   392

};

   393

   394

   395

#define SYM_REF5(class_name_c, ref1, ref2, ref3, ref4, ref5, ...)							\

   396

class class_name_c: public symbol_c {											\

   397

  public:														\

   398

    symbol_c *ref1;													\

   399

    symbol_c *ref2;													\

   400

    symbol_c *ref3;													\

   401

    symbol_c *ref4;													\

   402

    symbol_c *ref5;													\

   403

    __VA_ARGS__														\

   404

  public:														\

   405

    class_name_c(symbol_c *ref1,											\

   406

		 symbol_c *ref2,											\

   407

		 symbol_c *ref3,											\

   408

		 symbol_c *ref4,											\

   409

		 symbol_c *ref5,											\

   410

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   411

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   412

    virtual void *accept(visitor_c &visitor);										\

   413

    /* WARNING: only use this method for debugging purposes!! */							\

   414

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   415

};

   416

   417

   418

#define SYM_REF6(class_name_c, ref1, ref2, ref3, ref4, ref5, ref6, ...)							\

   419

class class_name_c: public symbol_c {											\

   420

  public:														\

   421

    symbol_c *ref1;													\

   422

    symbol_c *ref2;													\

   423

    symbol_c *ref3;													\

   424

    symbol_c *ref4;													\

   425

    symbol_c *ref5;													\

   426

    symbol_c *ref6;													\

   427

    __VA_ARGS__														\

   428

  public:														\

   429

    class_name_c(symbol_c *ref1,											\

   430

		 symbol_c *ref2,											\

   431

		 symbol_c *ref3,											\

   432

		 symbol_c *ref4,											\

   433

		 symbol_c *ref5,											\

   434

		 symbol_c *ref6 = NULL,											\

   435

                 int fl = 0, int fc = 0, const char *ffile = NULL /* filename */, long int forder=0,			\

   436

                 int ll = 0, int lc = 0, const char *lfile = NULL /* filename */, long int lorder=0);			\

   437

    virtual void *accept(visitor_c &visitor);										\

   438

    /* WARNING: only use this method for debugging purposes!! */							\

   439

    virtual const char *absyntax_cname(void) {return #class_name_c;};							\

   440

};

   441

   442

   443

#include "absyntax.def"

   444

   445

   446

   447

#undef SYM_LIST

   448

#undef SYM_TOKEN

   449

#undef SYM_REF0

   450

#undef SYM_REF1

   451

#undef SYM_REF2

   452

#undef SYM_REF3

   453

#undef SYM_REF4

   454

#undef SYM_REF5

   455

#undef SYM_REF6

   456

   457

#endif /*  _ABSYNTAX_HH */