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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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 */

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/*

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 * 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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 */

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/*

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 * Declaration of the Abstract Syntax data structure components

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 */

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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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 */

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#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...

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

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/* Forward declaration of the visitor interface

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 * declared in the visitor.hh file

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

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

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 * to the abstract syntax classes defined here.

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 */

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class visitor_c; // forward declaration

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class symbol_c; // forward declaration

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/* Case insensitive string compare */

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  /* Case insensitive string compare copied from

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

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   * 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 {

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

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

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

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        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));

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      };

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  };

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/* The base class of all symbols */

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class symbol_c {

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  public:

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

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

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    /*

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     * Line number for the purposes of error checking.

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     * Annotated (inserted) by stage1_2

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     */

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    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 */

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    /* 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.

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

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     */

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    symbol_c *datatype;

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

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

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     */

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    symbol_c *scope;    

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    /*** constant folding ***/

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    /* 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,

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

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     * operation assuming each type.

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

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     * having more than one entry filled in!

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     */

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

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

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                   cs_const_value, /* const value is valid */

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

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                 } const_status_t;

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    typedef struct const_value_real64_s {const_status_t status;  real64_t  value;  const_value_real64_s (): status(cs_undefined), value(0.0)   {} } const_value_real64_t;

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    typedef struct const_value_int64_s  {const_status_t status;   int64_t  value;  const_value_int64_s  (): status(cs_undefined), value(0)     {} } const_value_int64_t;

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    typedef struct const_value_uint64_s {const_status_t status;  uint64_t  value;  const_value_uint64_s (): status(cs_undefined), value(0)     {} } const_value_uint64_t;

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    typedef struct const_value_bool_s   {const_status_t status;      bool  value;  const_value_bool_s   (): status(cs_undefined), value(false) {} } const_value_bool_t;

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    typedef struct {

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      const_value_real64_t _real64; /* status is initialised to UNDEFINED */

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      const_value_int64_t   _int64; /* status is initialised to UNDEFINED */

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      const_value_uint64_t _uint64; /* status is initialised to UNDEFINED */

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      const_value_bool_t     _bool; /* status is initialised to UNDEFINED */

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    } const_value_t;

   166

    const_value_t const_value;

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    /*** Enumeration datatype checking ***/    

   169

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

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

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     */

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

   173

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  public:

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    /* default constructor */

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    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 */

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

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            );

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    /* default destructor */

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

   183

    virtual ~symbol_c(void) {return;};

   184

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

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};

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class token_c: public symbol_c {

   192

  public:

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

   194

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

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   196

    /* the value of the symbol. */

   197

    const char *value;

   198

   199

  public:

   200

    token_c(const char *value, 

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

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

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           );

   204

};

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 /* a list of symbols... */

   210

class list_c: public symbol_c {

   211

  public:

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

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

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

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    symbol_c **elements;

   217

   218

  public:

   219

    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 */

   220

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

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          );

   222

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    list_c(symbol_c *elem, 

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

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

   226

          );

   227

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

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    virtual void add_element(symbol_c *elem);

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

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

   231

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

   232

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

   233

     /* remove element at position pos. */

   234

    virtual void remove_element(int pos = 0);

   235

};

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#define SYM_LIST(class_name_c, ...)											\

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class class_name_c:	public list_c {											\

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  public:														\

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    __VA_ARGS__														\

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  public:														\

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    class_name_c(													\

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

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

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    class_name_c(symbol_c *elem, 											\

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

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

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    virtual void *accept(visitor_c &visitor);										\

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

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

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};

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#define SYM_TOKEN(class_name_c, ...)											\

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class class_name_c: 	public token_c {										\

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  public:														\

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    __VA_ARGS__														\

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  public:														\

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    class_name_c(const char *value, 											\

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

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

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    virtual void *accept(visitor_c &visitor);										\

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

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

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};

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#define SYM_REF0(class_name_c, ...)											\

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class class_name_c: public symbol_c {											\

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  public:														\

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    __VA_ARGS__														\

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  public:														\

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    class_name_c(		 											\

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

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

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    virtual void *accept(visitor_c &visitor);										\

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

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

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};

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

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class class_name_c: public symbol_c {											\

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  public:														\

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    symbol_c *ref1;													\

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    __VA_ARGS__														\

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  public:														\

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    class_name_c(symbol_c *ref1,											\

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

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

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    virtual void *accept(visitor_c &visitor);										\

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

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

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};

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

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class class_name_c: public symbol_c {											\

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  public:														\

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    symbol_c *ref1;													\

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    symbol_c *ref2;													\

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    __VA_ARGS__														\

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  public:														\

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    class_name_c(symbol_c *ref1,											\

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		 symbol_c *ref2 = NULL,											\

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

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

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    virtual void *accept(visitor_c &visitor);										\

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

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

   319

};

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

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class class_name_c: public symbol_c {											\

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  public:														\

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    symbol_c *ref1;													\

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    symbol_c *ref2;													\

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    symbol_c *ref3;													\

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    __VA_ARGS__														\

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  public:														\

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    class_name_c(symbol_c *ref1,											\

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		 symbol_c *ref2,											\

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		 symbol_c *ref3,											\

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

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

   335

    virtual void *accept(visitor_c &visitor);										\

   336

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

   337

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

   338

};

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

   342

class class_name_c: public symbol_c {											\

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  public:														\

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    symbol_c *ref1;													\

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    symbol_c *ref2;													\

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    symbol_c *ref3;													\

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    symbol_c *ref4;													\

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    __VA_ARGS__														\

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  public:														\

   350

    class_name_c(symbol_c *ref1,											\

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		 symbol_c *ref2,											\

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		 symbol_c *ref3,											\

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		 symbol_c *ref4 = NULL,											\

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

   355

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

   356

    virtual void *accept(visitor_c &visitor);										\

   357

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

   358

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

   359

};

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   361

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

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class class_name_c: public symbol_c {											\

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  public:														\

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    symbol_c *ref1;													\

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    symbol_c *ref2;													\

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    symbol_c *ref3;													\

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    symbol_c *ref4;													\

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    symbol_c *ref5;													\

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    __VA_ARGS__														\

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  public:														\

   372

    class_name_c(symbol_c *ref1,											\

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		 symbol_c *ref2,											\

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		 symbol_c *ref3,											\

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		 symbol_c *ref4,											\

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		 symbol_c *ref5,											\

   377

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

   378

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

   379

    virtual void *accept(visitor_c &visitor);										\

   380

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

   381

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

   382

};

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

   386

class class_name_c: public symbol_c {											\

   387

  public:														\

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    symbol_c *ref1;													\

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    symbol_c *ref2;													\

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    symbol_c *ref3;													\

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    symbol_c *ref4;													\

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    symbol_c *ref5;													\

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    symbol_c *ref6;													\

   394

    __VA_ARGS__														\

   395

  public:														\

   396

    class_name_c(symbol_c *ref1,											\

   397

		 symbol_c *ref2,											\

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		 symbol_c *ref3,											\

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		 symbol_c *ref4,											\

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		 symbol_c *ref5,											\

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		 symbol_c *ref6 = NULL,											\

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

   403

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

   404

    virtual void *accept(visitor_c &visitor);										\

   405

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

   406

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

   407

};

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#include "absyntax.def"

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#undef SYM_LIST

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#undef SYM_TOKEN

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#undef SYM_REF0

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#undef SYM_REF1

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#undef SYM_REF2

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#undef SYM_REF3

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#undef SYM_REF4

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#undef SYM_REF5

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#undef SYM_REF6

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#endif /*  _ABSYNTAX_HH */