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- #include <assert.h>
- #include <ctype.h>
- #include <stdio.h>
- #ifdef MSDOS
- #include <alloc.h>
- #endif
-
- /* machine dependent definitions */
- /* the following definitions are for the VAX */
- /* 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 16
- #define WORDSIZE(n) (((n)+(BITS_PER_WORD-1))/BITS_PER_WORD)
- #ifdef MSDOS
- #define BIT(r, n) ((((r)[(n) >> 4]) >> ((n) & 15)) & 1)
- #define SETBIT(r, n) ((r)[(n) >> 4] |= (1 << ((n) & 15)))
- #else
- #define BIT(r, n) ((((r)[(n)>>5])>>((n)&31))&1)
- #define SETBIT(r, n) ((r)[(n)>>5]|=((unsigned)1<<((n)&31)))
- #endif
-
- /* 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 */
-
- #ifdef MSDOS
- #define CODE_SUFFIX "_code.c"
- #define DEFINES_SUFFIX "_tab.h"
- #define OUTPUT_SUFFIX "_tab.c"
- #define VERBOSE_SUFFIX ".out"
- #else
- #define CODE_SUFFIX ".code.c"
- #define DEFINES_SUFFIX ".tab.h"
- #define OUTPUT_SUFFIX ".tab.c"
- #define VERBOSE_SUFFIX ".output"
- #endif
-
-
-
- /* 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
-
-
- /* 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
- #define ERROR 3
-
-
- /* character macros */
-
- #define IS_IDENT(c) (isalnum(c) || (c) == '_' || (c) == '.' || (c) == '$')
- #define IS_OCTAL(c) ((c) >= '0' && (c) <= '7')
- #define NUMERIC_VALUE(c) ((c) - '0')
-
-
- /* symbol macros */
-
- #define ISTOKEN(s) ((s) < start_symbol)
- #define ISVAR(s) ((s) >= start_symbol)
-
-
- /* storage allocation macros */
-
- #define CALLOC(k,n) (calloc((unsigned)(k),(unsigned)(n)))
- #define FREE(x) (free((char*)(x)))
- #define MALLOC(n) (malloc((unsigned)(n)))
- #define NEW(t) ((t*)allocate(sizeof(t)))
- #define NEW2(n,t) ((t*)allocate((unsigned)((n)*sizeof(t))))
- #define REALLOC(p,n) (realloc((char*)(p),(unsigned)(n)))
-
-
- /* 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 *myname;
- 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 *action_file_name;
- extern char *code_file_name;
- extern char *defines_file_name;
- extern char *input_file_name;
- extern char *output_file_name;
- extern char *text_file_name;
- extern char *union_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 RRtotal;
- extern short *SRconflicts;
- extern short *RRconflicts;
- extern short *defred;
- extern short *rules_used;
- extern short nunused;
- extern short final_state;
-
- /* global functions */
-
- extern char *allocate();
- extern bucket *lookup();
- extern bucket *make_bucket();
-
-
- /* system variables */
-
- extern int errno;
-
-
- /* system functions */
-
- #ifndef MSDOS
- extern void free();
- extern char *calloc();
- extern char *malloc();
- extern char *realloc();
- extern char *strcpy();
- #endif
-