299 lines
6.1 KiB
C
299 lines
6.1 KiB
C
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#include <assert.h>
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#include <ctype.h>
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#include <stdio.h>
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/* machine-dependent definitions */
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/* the following definitions are for the Tahoe */
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/* they might have to be changed for other machines */
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/* MAXCHAR is the largest unsigned character value */
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/* MAXSHORT is the largest value of a C short */
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/* MINSHORT is the most negative value of a C short */
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/* MAXTABLE is the maximum table size */
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/* BITS_PER_WORD is the number of bits in a C unsigned */
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/* WORDSIZE computes the number of words needed to */
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/* store n bits */
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/* BIT returns the value of the n-th bit starting */
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/* from r (0-indexed) */
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/* SETBIT sets the n-th bit starting from r */
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#if !__STDC__
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#define MAXCHAR 255
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#define MAXSHORT 32767
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#define MINSHORT -32768
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#define BITS_PER_WORD 32
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#else
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#include <limits.h>
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#define MAXCHAR UCHAR_MAX
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#define MAXSHORT SHRT_MAX
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#define MINSHORT SHRT_MIN
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#define BITS_PER_WORD (INT_MAX == 32767 ? 16 : 32)
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#define BITS_PER_BPW (INT_MAX == 32767 ? 4 : 5)
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#endif
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#define MAXTABLE 32500
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#define WORDSIZE(n) (((n)+(BITS_PER_WORD-1))/BITS_PER_WORD)
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#define BIT(r, n) ((((r)[(n)>>BITS_PER_BPW])>>((n)&(BITS_PER_WORD-1)))&1)
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#define SETBIT(r, n) ((r)[(n)>>BITS_PER_BPW]|=((unsigned)1<<((n)&(BITS_PER_WORD-1))))
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/* character names */
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#define NUL '\0' /* the null character */
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#define NEWLINE '\n' /* line feed */
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#define SP ' ' /* space */
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#define BS '\b' /* backspace */
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#define HT '\t' /* horizontal tab */
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#define VT '\013' /* vertical tab */
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#define CR '\r' /* carriage return */
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#define FF '\f' /* form feed */
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#define QUOTE '\'' /* single quote */
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#define DOUBLE_QUOTE '\"' /* double quote */
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#define BACKSLASH '\\' /* backslash */
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/* defines for constructing filenames */
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#define CODE_SUFFIX ".code.c"
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#define DEFINES_SUFFIX ".tab.h"
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#define OUTPUT_SUFFIX ".tab.c"
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#define VERBOSE_SUFFIX ".output"
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/* keyword codes */
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#define TOKEN 0
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#define LEFT 1
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#define RIGHT 2
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#define NONASSOC 3
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#define MARK 4
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#define TEXT 5
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#define TYPE 6
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#define START 7
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#define UNION 8
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#define IDENT 9
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/* symbol classes */
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#define UNKNOWN 0
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#define TERM 1
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#define NONTERM 2
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/* the undefined value */
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#define UNDEFINED (-1)
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/* action codes */
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#define SHIFT 1
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#define REDUCE 2
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/* character macros */
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#define IS_IDENT(c) (isalnum(c) || (c) == '_' || (c) == '.' || (c) == '$')
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#define IS_OCTAL(c) ((c) >= '0' && (c) <= '7')
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#define NUMERIC_VALUE(c) ((c) - '0')
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/* symbol macros */
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#define ISTOKEN(s) ((s) < start_symbol)
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#define ISVAR(s) ((s) >= start_symbol)
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/* storage allocation macros */
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#define CALLOC(k,n) (calloc((unsigned)(k),(unsigned)(n)))
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#define FREE(x) (free((char*)(x)))
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#define MALLOC(n) (malloc((unsigned)(n)))
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#define NEW(t) ((t*)allocate(sizeof(t)))
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#define NEW2(n,t) ((t*)allocate((unsigned)((n)*sizeof(t))))
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#define REALLOC(p,n) (realloc((char*)(p),(unsigned)(n)))
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/* the structure of a symbol table entry */
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typedef struct bucket bucket;
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struct bucket
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{
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struct bucket *link;
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struct bucket *next;
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char *name;
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char *tag;
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short value;
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short index;
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short prec;
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char class;
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char assoc;
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};
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/* the structure of the LR(0) state machine */
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typedef struct core core;
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struct core
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{
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struct core *next;
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struct core *link;
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short number;
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short accessing_symbol;
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short nitems;
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short items[1];
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};
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/* the structure used to record shifts */
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typedef struct shifts shifts;
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struct shifts
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{
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struct shifts *next;
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short number;
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short nshifts;
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short shift[1];
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};
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/* the structure used to store reductions */
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typedef struct reductions reductions;
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struct reductions
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{
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struct reductions *next;
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short number;
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short nreds;
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short rules[1];
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};
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/* the structure used to represent parser actions */
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typedef struct action action;
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struct action
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{
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struct action *next;
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short symbol;
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short number;
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short prec;
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char action_code;
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char assoc;
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char suppressed;
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};
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/* global variables */
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extern char dflag;
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extern char lflag;
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extern char rflag;
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extern char tflag;
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extern char vflag;
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extern char *symbol_prefix;
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extern char *myname;
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extern char *cptr;
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extern char *line;
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extern int lineno;
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extern int outline;
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extern char *banner[];
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extern char *tables[];
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extern char *header[];
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extern char *body[];
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extern char *trailer[];
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extern char *action_file_name;
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extern char *code_file_name;
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extern char *defines_file_name;
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extern char *input_file_name;
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extern char *output_file_name;
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extern char *text_file_name;
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extern char *union_file_name;
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extern char *verbose_file_name;
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extern FILE *action_file;
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extern FILE *code_file;
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extern FILE *defines_file;
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extern FILE *input_file;
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extern FILE *output_file;
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extern FILE *text_file;
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extern FILE *union_file;
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extern FILE *verbose_file;
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extern int nitems;
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extern int nrules;
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extern int nsyms;
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extern int ntokens;
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extern int nvars;
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extern int ntags;
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extern char unionized;
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extern char line_format[];
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extern int start_symbol;
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extern char **symbol_name;
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extern short *symbol_value;
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extern short *symbol_prec;
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extern char *symbol_assoc;
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extern short *ritem;
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extern short *rlhs;
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extern short *rrhs;
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extern short *rprec;
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extern char *rassoc;
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extern short **derives;
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extern char *nullable;
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extern bucket *first_symbol;
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extern bucket *last_symbol;
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extern int nstates;
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extern core *first_state;
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extern shifts *first_shift;
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extern reductions *first_reduction;
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extern short *accessing_symbol;
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extern core **state_table;
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extern shifts **shift_table;
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extern reductions **reduction_table;
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extern unsigned *LA;
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extern short *LAruleno;
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extern short *lookaheads;
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extern short *goto_map;
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extern short *from_state;
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extern short *to_state;
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extern action **parser;
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extern int SRtotal;
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extern int RRtotal;
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extern short *SRconflicts;
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extern short *RRconflicts;
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extern short *defred;
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extern short *rules_used;
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extern short nunused;
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extern short final_state;
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/* global functions */
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extern char *allocate();
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extern bucket *lookup();
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extern bucket *make_bucket();
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/* system variables */
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extern int errno;
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/* system functions */
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extern void free();
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extern char *calloc();
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extern char *malloc();
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extern char *realloc();
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extern char *strcpy();
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