dextern

<B>Digital的Unix操作系统VAX 4.2源码</B>

/*
 * @(#)dextern	4.2	(Berkeley)	3/21/86
 */
# include <stdio.h>
# include <ctype.h>
# include "files"

	/*  MANIFEST CONSTANT DEFINITIONS */

	/* base of nonterminal internal numbers */
# define NTBASE 010000

	/* internal codes for error and accept actions */

# define ERRCODE  8190
# define ACCEPTCODE 8191

	/* sizes and limits */

# ifdef HUGE
# define ACTSIZE 12000
# define MEMSIZE 24000
# define NSTATES 1000
# define NTERMS 300
# define NPROD 600
# define NNONTERM 300
# define TEMPSIZE 1200
# define CNAMSZ 5000
# define LSETSIZE 600
# define WSETSIZE 350
# endif

# ifdef MEDIUM
# define ACTSIZE 4000
# define MEMSIZE 5200
# define NSTATES 600
# define NTERMS 127
# define NPROD 400
# define NNONTERM 200
# define TEMPSIZE 800
# define CNAMSZ 4000
# define LSETSIZE 450
# define WSETSIZE 250
# endif

# define NAMESIZE 50
# define NTYPES 63

# ifdef WORD32
# define TBITSET ((32+NTERMS)/32)

	/* bit packing macros (may be machine dependent) */
# define BIT(a,i) ((a)[(i)>>5] & (1<<((i)&037)))
# define SETBIT(a,i) ((a)[(i)>>5] |= (1<<((i)&037)))

	/* number of words needed to hold n+1 bits */
# define NWORDS(n) (((n)+32)/32)

# else

# define TBITSET ((16+NTERMS)/16)

	/* bit packing macros (may be machine dependent) */
# define BIT(a,i) ((a)[(i)>>4] & (1<<((i)&017)))
# define SETBIT(a,i) ((a)[(i)>>4] |= (1<<((i)&017)))

	/* number of words needed to hold n+1 bits */
# define NWORDS(n) (((n)+16)/16)
# endif

	/* relationships which must hold:
	TBITSET ints must hold NTERMS+1 bits...
	WSETSIZE >= NNONTERM
	LSETSIZE >= NNONTERM
	TEMPSIZE >= NTERMS + NNONTERMs + 1
	TEMPSIZE >= NSTATES
	*/

	/* associativities */

# define NOASC 0  /* no assoc. */
# define LASC 1  /* left assoc. */
# define RASC 2  /* right assoc. */
# define BASC 3  /* binary assoc. */

	/* flags for state generation */

# define DONE 0
# define MUSTDO 1
# define MUSTLOOKAHEAD 2

	/* flags for a rule having an action, and being reduced */

# define ACTFLAG 04
# define REDFLAG 010

	/* output parser flags */
# define YYFLAG1 (-1000)

	/* macros for getting associativity and precedence levels */

# define ASSOC(i) ((i)&03)
# define PLEVEL(i) (((i)>>4)&077)
# define TYPE(i)  ((i>>10)&077)

	/* macros for setting associativity and precedence levels */

# define SETASC(i,j) i|=j
# define SETPLEV(i,j) i |= (j<<4)
# define SETTYPE(i,j) i |= (j<<10)

	/* looping macros */

# define TLOOP(i) for(i=1;i<=ntokens;++i)
# define NTLOOP(i) for(i=0;i<=nnonter;++i)
# define PLOOP(s,i) for(i=s;i<nprod;++i)
# define SLOOP(i) for(i=0;i<nstate;++i)
# define WSBUMP(x) ++x
# define WSLOOP(s,j) for(j=s;j<cwp;++j)
# define ITMLOOP(i,p,q) q=pstate[i+1];for(p=pstate[i];p<q;++p)
# define SETLOOP(i) for(i=0;i<tbitset;++i)

	/* I/O descriptors */

extern FILE * finput;		/* input file */
extern FILE * faction;		/* file for saving actions */
extern FILE *fdefine;		/* file for # defines */
extern FILE * ftable;		/* y.tab.c file */
extern FILE * ftemp;		/* tempfile to pass 2 */
extern FILE * foutput;		/* y.output file */

	/* structure declarations */

struct looksets {
	int lset[TBITSET];
	};

struct item {
	int *pitem;
	struct looksets *look;
	};

struct toksymb {
	char *name;
	int value;
	};

struct ntsymb {
	char *name;
	int tvalue;
	};

struct wset {
	int *pitem;
	int flag;
	struct looksets ws;
	};

	/* token information */

extern int ntokens ;	/* number of tokens */
extern struct toksymb tokset[];
extern int toklev[];	/* vector with the precedence of the terminals */

	/* nonterminal information */

extern int nnonter ;	/* the number of nonterminals */
extern struct ntsymb nontrst[];

	/* grammar rule information */

extern int nprod ;	/* number of productions */
extern int *prdptr[];	/* pointers to descriptions of productions */
extern int levprd[] ;	/* contains production levels to break conflicts */

	/* state information */

extern int nstate ;		/* number of states */
extern struct item *pstate[];	/* pointers to the descriptions of the states */
extern int tystate[];	/* contains type information about the states */
extern int defact[];	/* the default action of the state */
extern int tstates[];	/* the states deriving each token */
extern int ntstates[];	/* the states deriving each nonterminal */
extern int mstates[];	/* the continuation of the chains begun in tstates and ntstates */

	/* lookahead set information */

extern struct looksets lkst[];
extern int nolook;  /* flag to turn off lookahead computations */

	/* working set information */

extern struct wset wsets[];
extern struct wset *cwp;

	/* storage for productions */

extern int mem0[];
extern int *mem;

	/* storage for action table */

extern int amem[];  /* action table storage */
extern int *memp ;		/* next free action table position */
extern int indgo[];		/* index to the stored goto table */

	/* temporary vector, indexable by states, terms, or ntokens */

extern int temp1[];
extern int lineno; /* current line number */

	/* statistics collection variables */

extern int zzgoent ;
extern int zzgobest ;
extern int zzacent ;
extern int zzexcp ;
extern int zzclose ;
extern int zzrrconf ;
extern int zzsrconf ;
	/* define functions with strange types... */

extern char *cstash();
extern struct looksets *flset();
extern char *symnam();
extern char *writem();

	/* default settings for a number of macros */

	/* name of yacc tempfiles */

# ifndef TEMPNAME
# define TEMPNAME "yacc.tmp"
# endif

# ifndef ACTNAME
# define ACTNAME "yacc.acts"
# endif

	/* output file name */

# ifndef OFILE
# define OFILE "y.tab.c"
# endif

	/* user output file name */

# ifndef FILEU
# define FILEU "y.output"
# endif

	/* output file for # defines */

# ifndef FILED
# define FILED "y.tab.h"
# endif

	/* command to clobber tempfiles after use */

# ifndef ZAPFILE
# define ZAPFILE(x) unlink(x)
# endif