/*      $OpenBSD: defs.h,v 1.20 2020/05/24 17:31:54 espie Exp $ */
/*      $NetBSD: defs.h,v 1.6 1996/03/19 03:21:30 jtc Exp $     */

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Robert Paul Corbett.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)defs.h      5.6 (Berkeley) 5/24/93
 */

#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

/*  machine-dependent definitions                       */
/*  the following definitions are for the Tahoe         */
/*  they might have to be changed for other machines    */

/*  MAXCHAR is the largest unsigned character value     */
/*  MAXSHORT is the largest value of a C short          */
/*  MINSHORT is the most negative value of a C short    */
/*  MAXTABLE is the maximum table size                  */
/*  BITS_PER_WORD is the number of bits in a C unsigned */
/*  WORDSIZE computes the number of words needed to     */
/*      store n bits                                    */
/*  BIT returns the value of the n-th bit starting      */
/*      from r (0-indexed)                              */
/*  SETBIT sets the n-th bit starting from r            */

#define MAXCHAR         255
#define MAXSHORT        32767
#define MINSHORT        -32768
#define MAXTABLE        32500
#define BITS_PER_WORD   32
#define WORDSIZE(n)     (((n)+(BITS_PER_WORD-1))/BITS_PER_WORD)
#define BIT(r, n)       ((((r)[(n)>>5])>>((n)&31))&1)
#define SETBIT(r, n)    ((r)[(n)>>5]|=((unsigned)1<<((n)&31)))


/*  character names  */

#define NUL             '\0'    /*  the null character  */
#define NEWLINE         '\n'    /*  line feed  */
#define SP              ' '     /*  space  */
#define BS              '\b'    /*  backspace  */
#define HT              '\t'    /*  horizontal tab  */
#define VT              '\013'  /*  vertical tab  */
#define CR              '\r'    /*  carriage return  */
#define FF              '\f'    /*  form feed  */
#define QUOTE           '\''    /*  single quote  */
#define DOUBLE_QUOTE    '\"'    /*  double quote  */
#define BACKSLASH       '\\'    /*  backslash  */


/* defines for constructing filenames */

#define CODE_SUFFIX     ".code.c"
#define DEFINES_SUFFIX  ".tab.h"
#define OUTPUT_SUFFIX   ".tab.c"
#define VERBOSE_SUFFIX  ".output"


/* keyword codes */

#define TOKEN 0
#define LEFT 1
#define RIGHT 2
#define NONASSOC 3
#define MARK 4
#define TEXT 5
#define TYPE 6
#define START 7
#define UNION 8
#define IDENT 9
#define EXPECT 10


/*  symbol classes  */

#define UNKNOWN 0
#define TERM 1
#define NONTERM 2


/*  the undefined value  */

#define UNDEFINED (-1)


/*  action codes  */

#define SHIFT 1
#define REDUCE 2


/*  character macros  */

#define IS_IDENT(c)     (isalnum(c) || (c) == '_' || (c) == '.' || (c) == '$')
#define NUMERIC_VALUE(c)        ((c) - '0')


/*  symbol macros  */

#define ISTOKEN(s)      ((s) < start_symbol)
#define ISVAR(s)        ((s) >= start_symbol)


/*  storage allocation macros  */

#define NEW(t)          ((t*)allocate(sizeof(t)))
#define NEW2(n,t)       ((t*)allocate((n)*sizeof(t)))


/*  the structure of a symbol table entry  */

typedef struct bucket bucket;
struct bucket {
        struct bucket *link;
        struct bucket *next;
        char *name;
        char *tag;
        short value;
        short index;
        short prec;
        char class;
        char assoc;
};


/*  the structure of the LR(0) state machine  */

typedef struct core core;
struct core {
        struct core *next;
        struct core *link;
        short number;
        short accessing_symbol;
        short nitems;
        short items[1];
};


/*  the structure used to record shifts  */

typedef struct shifts shifts;
struct shifts {
        struct shifts *next;
        short number;
        short nshifts;
        short shift[1];
};


/*  the structure used to store reductions  */

typedef struct reductions reductions;
struct reductions {
        struct reductions *next;
        short number;
        short nreds;
        short rules[1];
};


/*  the structure used to represent parser actions  */

typedef struct action action;
struct action {
        struct action *next;
        short symbol;
        short number;
        short prec;
        char action_code;
        char assoc;
        char suppressed;
};


/* global variables */

extern char dflag;
extern char lflag;
extern char rflag;
extern char tflag;
extern char vflag;
extern char *symbol_prefix;

extern char *cptr;
extern char *line;
extern int lineno;
extern int outline;

extern char *banner[];
extern char *tables[];
extern char *header[];
extern char *body[];
extern char *trailer[];

extern char *code_file_name;
extern char *defines_file_name;
extern char *input_file_name;
extern char *output_file_name;
extern char *verbose_file_name;

extern FILE *action_file;
extern FILE *code_file;
extern FILE *defines_file;
extern FILE *input_file;
extern FILE *output_file;
extern FILE *text_file;
extern FILE *union_file;
extern FILE *verbose_file;

extern int nitems;
extern int nrules;
extern int nsyms;
extern int ntokens;
extern int nvars;
extern int ntags;

extern char unionized;
extern char line_format[];

extern int   start_symbol;
extern char  **symbol_name;
extern short *symbol_value;
extern short *symbol_prec;
extern char  *symbol_assoc;

extern short *ritem;
extern short *rlhs;
extern short *rrhs;
extern short *rprec;
extern char  *rassoc;

extern short **derives;
extern char *nullable;

extern bucket *first_symbol;
extern bucket *last_symbol;

extern int nstates;
extern core *first_state;
extern shifts *first_shift;
extern reductions *first_reduction;
extern short *accessing_symbol;
extern core **state_table;
extern shifts **shift_table;
extern reductions **reduction_table;
extern unsigned *LA;
extern short *LAruleno;
extern short *lookaheads;
extern short *goto_map;
extern short *from_state;
extern short *to_state;

extern action **parser;
extern int SRtotal;
extern int SRexpect;
extern int RRtotal;
extern short *SRconflicts;
extern short *RRconflicts;
extern short *defred;
extern short *rules_used;
extern short nunused;
extern short final_state;

/* global functions */

extern void *allocate(size_t);
extern bucket *lookup(char *);
extern bucket *make_bucket(char *);
extern void set_first_derives(void);
extern void closure(short *, int);
extern void finalize_closure(void);

extern __dead void fatal(char *);

extern void reflexive_transitive_closure(unsigned *, int);

extern __dead void no_space(void);
extern __dead void open_error(char *);
extern __dead void tempfile_error(void);
extern __dead void open_write_error(char *);
extern __dead void unexpected_EOF(void);
extern void print_pos(char *, char *);
extern __dead void syntax_error(int, char *, char *);
extern __dead void unterminated_comment(int, char *, char *);
extern __dead void unterminated_string(int, char *, char *);
extern __dead void unterminated_text(int, char *, char *);
extern __dead void unterminated_union(int, char *, char *);
extern __dead void over_unionized(char *);
extern __dead void illegal_tag(int, char *, char *);
extern __dead void illegal_character(char *);
extern __dead void used_reserved(char *);
extern __dead void tokenized_start(char *);
extern void retyped_warning(char *);
extern void reprec_warning(char *);
extern void revalued_warning(char *);
extern __dead void terminal_start(char *);
extern void restarted_warning(void);
extern __dead void no_grammar(void);
extern __dead void terminal_lhs(int);
extern void prec_redeclared(void);
extern __dead void unterminated_action(int, char *, char *);
extern void dollar_warning(int, int);
extern __dead void dollar_error(int, char *, char *);
extern __dead void untyped_lhs(void);
extern __dead void untyped_rhs(int, char *);
extern __dead void unknown_rhs(int);
extern void default_action_warning(void);
extern __dead void undefined_goal(char *);
extern void undefined_symbol_warning(char *);

extern void lalr(void);

extern void reader(void);
extern void lr0(void);
extern void free_nullable(void);
extern void free_derives(void);
extern void make_parser(void);
extern void verbose(void);
extern void output(void);
extern void free_parser(void);
extern void write_section(char *[]);

extern void create_symbol_table(void);
extern void free_symbol_table(void);
extern void free_symbols(void);


/* system variables */

extern char *__progname;