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/*

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

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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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 *

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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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 */

    23

    24

/*

    25

 * An IEC 61131-3 compiler.

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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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 */

    31

    32

/*

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 * Declaration of the Abstract Syntax data structure components

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 */

    35

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/*

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 * ABSYNTAX.H

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 *

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

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

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

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 * the relavent code.

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 */

    44

    45

#ifndef _ABSYNTAX_HH

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#define _ABSYNTAX_HH

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

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#include <vector>

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#include <map>

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#include <string>

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#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

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 * 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

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 * to the abstract syntax classes defined here.

    64

 */

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class visitor_c; // forward declaration

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    67

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class symbol_c; // forward declaration

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    74

    75

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/* Case insensitive string compare */

    77

  /* Case insensitive string compare copied from

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

    79

   * by Bjarne Stroustrup, ISBN 0201889544.

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   */

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class nocasecmp_c {

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    public:

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

    84

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

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        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());

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

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        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.

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

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

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 * 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

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 * 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 */

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

   112

                 } const_status_t;

   113

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    template<typename value_type> class const_value__ {

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      const_status_t status;  

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      value_type     value;

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   118

      public:

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

   120

   121

      value_type get(void)              {return value;}

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

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      void       set_overflow(void)     {status = cs_overflow   ;}

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      void       set_nonconst(void)     {status = cs_non_const  ;}

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

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

   127

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

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      bool       is_undefined(void)     {return (status == cs_undefined  );}

   129

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

   130

    };

   131

   132

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

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

   134

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

   135

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

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    /* default constructor and destructor */

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     const_value_c(void) {};

   139

    ~const_value_c(void) {};

   140

};

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/* The base class of all symbols */

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class symbol_c {

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   147

  public:

   148

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

   149

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

   150

   151

    /*

   152

     * Annotations produced during stage 1_2

   153

     */    

   154

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

   155

    symbol_c *parent; 

   156

   157

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

   158

    int first_line;

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    int first_column;

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

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

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    int last_line;

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    int last_column;

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

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

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    /*

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     * Annotations produced during stage 3

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     */    

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    /*** Data type analysis ***/

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    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 */

   173

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

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

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

   176

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

   177

     */

   178

    symbol_c *datatype;

   179

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

   180

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

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

   182

     *  symbolic_variable_c, array_variable_c, structured_variable_c

   183

     */

   184

    symbol_c *scope;    

   185

   186

    /*** constant folding ***/

   187

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

   188

    const_value_c const_value;

   189

   190

    /*** Enumeration datatype checking ***/    

   191

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

   192

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

   193

     */

   194

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

   195

   196

    /*

   197

     * Annotations produced during stage 4

   198

     */

   199

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

   200

     * possible use would quickly get out of hand.

   201

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

   202

     */

   203

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

   204

    anotations_map_t anotations_map;

   205

   206

   207

  public:

   208

    /* default constructor */

   209

    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 */

   210

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

   211

            );

   212

   213

    /* default destructor */

   214

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

   215

    virtual ~symbol_c(void) {return;};

   216

   217

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

   218

};

   219

   220

   221

   222

   223

class token_c: public symbol_c {

   224

  public:

   225

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

   226

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

   227

   228

    /* the value of the symbol. */

   229

    const char *value;

   230

   231

  public:

   232

    token_c(const char *value, 

   233

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

   234

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

   235

           );

   236

};

   237

   238

   239

   240

   241

 /* a list of symbols... */

   242

class list_c: public symbol_c {

   243

  public:

   244

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

   245

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

   246

   247

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

   248

    symbol_c **elements;

   249

   250

  public:

   251

    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 */

   252

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

   253

          );

   254

   255

    list_c(symbol_c *elem, 

   256

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

   257

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

   258

          );

   259

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

   260

    virtual void add_element(symbol_c *elem);

   261

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

   262

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

   263

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

   264

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

   265

     /* remove element at position pos. */

   266

    virtual void remove_element(int pos = 0);

   267

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

   268

    virtual void clear(void);

   269

};

   270

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   278

   279

#define SYM_LIST(class_name_c, ...)											\

   280

class class_name_c:	public list_c {											\

   281

  public:														\

   282

    __VA_ARGS__														\

   283

  public:														\

   284

    class_name_c(													\

   285

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

   286

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

   287

    class_name_c(symbol_c *elem, 											\

   288

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

   289

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

   290

    virtual void *accept(visitor_c &visitor);										\

   291

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

   292

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

   293

};

   294

   295

   296

#define SYM_TOKEN(class_name_c, ...)											\

   297

class class_name_c: 	public token_c {										\

   298

  public:														\

   299

    __VA_ARGS__														\

   300

  public:														\

   301

    class_name_c(const char *value, 											\

   302

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

   303

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

   304

    virtual void *accept(visitor_c &visitor);										\

   305

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

   306

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

   307

};

   308

   309

   310

#define SYM_REF0(class_name_c, ...)											\

   311

class class_name_c: public symbol_c {											\

   312

  public:														\

   313

    __VA_ARGS__														\

   314

  public:														\

   315

    class_name_c(		 											\

   316

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

   317

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

   318

    virtual void *accept(visitor_c &visitor);										\

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

   320

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

   321

};

   322

   323

   324

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

   325

class class_name_c: public symbol_c {											\

   326

  public:														\

   327

    symbol_c *ref1;													\

   328

    __VA_ARGS__														\

   329

  public:														\

   330

    class_name_c(symbol_c *ref1,											\

   331

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

   332

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

   333

    virtual void *accept(visitor_c &visitor);										\

   334

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

   335

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

   336

};

   337

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   339

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

   340

class class_name_c: public symbol_c {											\

   341

  public:														\

   342

    symbol_c *ref1;													\

   343

    symbol_c *ref2;													\

   344

    __VA_ARGS__														\

   345

  public:														\

   346

    class_name_c(symbol_c *ref1,											\

   347

		 symbol_c *ref2 = NULL,											\

   348

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

   349

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

   350

    virtual void *accept(visitor_c &visitor);										\

   351

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

   352

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

   353

};

   354

   355

   356

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

   357

class class_name_c: public symbol_c {											\

   358

  public:														\

   359

    symbol_c *ref1;													\

   360

    symbol_c *ref2;													\

   361

    symbol_c *ref3;													\

   362

    __VA_ARGS__														\

   363

  public:														\

   364

    class_name_c(symbol_c *ref1,											\

   365

		 symbol_c *ref2,											\

   366

		 symbol_c *ref3,											\

   367

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

   368

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

   369

    virtual void *accept(visitor_c &visitor);										\

   370

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

   371

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

   372

};

   373

   374

   375

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

   376

class class_name_c: public symbol_c {											\

   377

  public:														\

   378

    symbol_c *ref1;													\

   379

    symbol_c *ref2;													\

   380

    symbol_c *ref3;													\

   381

    symbol_c *ref4;													\

   382

    __VA_ARGS__														\

   383

  public:														\

   384

    class_name_c(symbol_c *ref1,											\

   385

		 symbol_c *ref2,											\

   386

		 symbol_c *ref3,											\

   387

		 symbol_c *ref4 = NULL,											\

   388

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

   389

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

   390

    virtual void *accept(visitor_c &visitor);										\

   391

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

   392

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

   393

};

   394

   395

   396

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

   397

class class_name_c: public symbol_c {											\

   398

  public:														\

   399

    symbol_c *ref1;													\

   400

    symbol_c *ref2;													\

   401

    symbol_c *ref3;													\

   402

    symbol_c *ref4;													\

   403

    symbol_c *ref5;													\

   404

    __VA_ARGS__														\

   405

  public:														\

   406

    class_name_c(symbol_c *ref1,											\

   407

		 symbol_c *ref2,											\

   408

		 symbol_c *ref3,											\

   409

		 symbol_c *ref4,											\

   410

		 symbol_c *ref5,											\

   411

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

   412

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

   413

    virtual void *accept(visitor_c &visitor);										\

   414

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

   415

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

   416

};

   417

   418

   419

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

   420

class class_name_c: public symbol_c {											\

   421

  public:														\

   422

    symbol_c *ref1;													\

   423

    symbol_c *ref2;													\

   424

    symbol_c *ref3;													\

   425

    symbol_c *ref4;													\

   426

    symbol_c *ref5;													\

   427

    symbol_c *ref6;													\

   428

    __VA_ARGS__														\

   429

  public:														\

   430

    class_name_c(symbol_c *ref1,											\

   431

		 symbol_c *ref2,											\

   432

		 symbol_c *ref3,											\

   433

		 symbol_c *ref4,											\

   434

		 symbol_c *ref5,											\

   435

		 symbol_c *ref6 = NULL,											\

   436

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

   437

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

   438

    virtual void *accept(visitor_c &visitor);										\

   439

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

   440

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

   441

};

   442

   443

   444

#include "absyntax.def"

   445

   446

   447

   448

#undef SYM_LIST

   449

#undef SYM_TOKEN

   450

#undef SYM_REF0

   451

#undef SYM_REF1

   452

#undef SYM_REF2

   453

#undef SYM_REF3

   454

#undef SYM_REF4

   455

#undef SYM_REF5

   456

#undef SYM_REF6

   457

   458

#endif /*  _ABSYNTAX_HH */