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Annotation of 42BSD/usr.bin/yacc/dextern, revision 1.1

1.1     ! root        1: /*
        !             2:  * @(#)dextern 4.1     (Berkeley)      2/11/83
        !             3:  */
        !             4: # include <stdio.h>
        !             5: # include <ctype.h>
        !             6: # include "files"
        !             7: 
        !             8:        /*  MANIFEST CONSTANT DEFINITIONS */
        !             9: 
        !            10:        /* base of nonterminal internal numbers */
        !            11: # define NTBASE 010000
        !            12: 
        !            13:        /* internal codes for error and accept actions */
        !            14: 
        !            15: # define ERRCODE  8190
        !            16: # define ACCEPTCODE 8191
        !            17: 
        !            18:        /* sizes and limits */
        !            19: 
        !            20: # ifdef HUGE
        !            21: # define ACTSIZE 12000
        !            22: # define MEMSIZE 12000
        !            23: # define NSTATES 750
        !            24: # define NTERMS 127
        !            25: # define NPROD 600
        !            26: # define NNONTERM 300
        !            27: # define TEMPSIZE 1200
        !            28: # define CNAMSZ 5000
        !            29: # define LSETSIZE 600
        !            30: # define WSETSIZE 350
        !            31: # endif
        !            32: 
        !            33: # ifdef MEDIUM
        !            34: # define ACTSIZE 4000
        !            35: # define MEMSIZE 5200
        !            36: # define NSTATES 600
        !            37: # define NTERMS 127
        !            38: # define NPROD 400
        !            39: # define NNONTERM 200
        !            40: # define TEMPSIZE 800
        !            41: # define CNAMSZ 4000
        !            42: # define LSETSIZE 450
        !            43: # define WSETSIZE 250
        !            44: # endif
        !            45: 
        !            46: # define NAMESIZE 50
        !            47: # define NTYPES 63
        !            48: 
        !            49: # ifdef WORD32
        !            50: # define TBITSET ((32+NTERMS)/32)
        !            51: 
        !            52:        /* bit packing macros (may be machine dependent) */
        !            53: # define BIT(a,i) ((a)[(i)>>5] & (1<<((i)&037)))
        !            54: # define SETBIT(a,i) ((a)[(i)>>5] |= (1<<((i)&037)))
        !            55: 
        !            56:        /* number of words needed to hold n+1 bits */
        !            57: # define NWORDS(n) (((n)+32)/32)
        !            58: 
        !            59: # else
        !            60: 
        !            61: # define TBITSET ((16+NTERMS)/16)
        !            62: 
        !            63:        /* bit packing macros (may be machine dependent) */
        !            64: # define BIT(a,i) ((a)[(i)>>4] & (1<<((i)&017)))
        !            65: # define SETBIT(a,i) ((a)[(i)>>4] |= (1<<((i)&017)))
        !            66: 
        !            67:        /* number of words needed to hold n+1 bits */
        !            68: # define NWORDS(n) (((n)+16)/16)
        !            69: # endif
        !            70: 
        !            71:        /* relationships which must hold:
        !            72:        TBITSET ints must hold NTERMS+1 bits...
        !            73:        WSETSIZE >= NNONTERM
        !            74:        LSETSIZE >= NNONTERM
        !            75:        TEMPSIZE >= NTERMS + NNONTERMs + 1
        !            76:        TEMPSIZE >= NSTATES
        !            77:        */
        !            78: 
        !            79:        /* associativities */
        !            80: 
        !            81: # define NOASC 0  /* no assoc. */
        !            82: # define LASC 1  /* left assoc. */
        !            83: # define RASC 2  /* right assoc. */
        !            84: # define BASC 3  /* binary assoc. */
        !            85: 
        !            86:        /* flags for state generation */
        !            87: 
        !            88: # define DONE 0
        !            89: # define MUSTDO 1
        !            90: # define MUSTLOOKAHEAD 2
        !            91: 
        !            92:        /* flags for a rule having an action, and being reduced */
        !            93: 
        !            94: # define ACTFLAG 04
        !            95: # define REDFLAG 010
        !            96: 
        !            97:        /* output parser flags */
        !            98: # define YYFLAG1 (-1000)
        !            99: 
        !           100:        /* macros for getting associativity and precedence levels */
        !           101: 
        !           102: # define ASSOC(i) ((i)&03)
        !           103: # define PLEVEL(i) (((i)>>4)&077)
        !           104: # define TYPE(i)  ((i>>10)&077)
        !           105: 
        !           106:        /* macros for setting associativity and precedence levels */
        !           107: 
        !           108: # define SETASC(i,j) i|=j
        !           109: # define SETPLEV(i,j) i |= (j<<4)
        !           110: # define SETTYPE(i,j) i |= (j<<10)
        !           111: 
        !           112:        /* looping macros */
        !           113: 
        !           114: # define TLOOP(i) for(i=1;i<=ntokens;++i)
        !           115: # define NTLOOP(i) for(i=0;i<=nnonter;++i)
        !           116: # define PLOOP(s,i) for(i=s;i<nprod;++i)
        !           117: # define SLOOP(i) for(i=0;i<nstate;++i)
        !           118: # define WSBUMP(x) ++x
        !           119: # define WSLOOP(s,j) for(j=s;j<cwp;++j)
        !           120: # define ITMLOOP(i,p,q) q=pstate[i+1];for(p=pstate[i];p<q;++p)
        !           121: # define SETLOOP(i) for(i=0;i<tbitset;++i)
        !           122: 
        !           123:        /* I/O descriptors */
        !           124: 
        !           125: extern FILE * finput;          /* input file */
        !           126: extern FILE * faction;         /* file for saving actions */
        !           127: extern FILE *fdefine;          /* file for # defines */
        !           128: extern FILE * ftable;          /* y.tab.c file */
        !           129: extern FILE * ftemp;           /* tempfile to pass 2 */
        !           130: extern FILE * foutput;         /* y.output file */
        !           131: 
        !           132:        /* structure declarations */
        !           133: 
        !           134: struct looksets {
        !           135:        int lset[TBITSET];
        !           136:        };
        !           137: 
        !           138: struct item {
        !           139:        int *pitem;
        !           140:        struct looksets *look;
        !           141:        };
        !           142: 
        !           143: struct toksymb {
        !           144:        char *name;
        !           145:        int value;
        !           146:        };
        !           147: 
        !           148: struct ntsymb {
        !           149:        char *name;
        !           150:        int tvalue;
        !           151:        };
        !           152: 
        !           153: struct wset {
        !           154:        int *pitem;
        !           155:        int flag;
        !           156:        struct looksets ws;
        !           157:        };
        !           158: 
        !           159:        /* token information */
        !           160: 
        !           161: extern int ntokens ;   /* number of tokens */
        !           162: extern struct toksymb tokset[];
        !           163: extern int toklev[];   /* vector with the precedence of the terminals */
        !           164: 
        !           165:        /* nonterminal information */
        !           166: 
        !           167: extern int nnonter ;   /* the number of nonterminals */
        !           168: extern struct ntsymb nontrst[];
        !           169: 
        !           170:        /* grammar rule information */
        !           171: 
        !           172: extern int nprod ;     /* number of productions */
        !           173: extern int *prdptr[];  /* pointers to descriptions of productions */
        !           174: extern int levprd[] ;  /* contains production levels to break conflicts */
        !           175: 
        !           176:        /* state information */
        !           177: 
        !           178: extern int nstate ;            /* number of states */
        !           179: extern struct item *pstate[];  /* pointers to the descriptions of the states */
        !           180: extern int tystate[];  /* contains type information about the states */
        !           181: extern int defact[];   /* the default action of the state */
        !           182: extern int tstates[];  /* the states deriving each token */
        !           183: extern int ntstates[]; /* the states deriving each nonterminal */
        !           184: extern int mstates[];  /* the continuation of the chains begun in tstates and ntstates */
        !           185: 
        !           186:        /* lookahead set information */
        !           187: 
        !           188: extern struct looksets lkst[];
        !           189: extern int nolook;  /* flag to turn off lookahead computations */
        !           190: 
        !           191:        /* working set information */
        !           192: 
        !           193: extern struct wset wsets[];
        !           194: extern struct wset *cwp;
        !           195: 
        !           196:        /* storage for productions */
        !           197: 
        !           198: extern int mem0[];
        !           199: extern int *mem;
        !           200: 
        !           201:        /* storage for action table */
        !           202: 
        !           203: extern int amem[];  /* action table storage */
        !           204: extern int *memp ;             /* next free action table position */
        !           205: extern int indgo[];            /* index to the stored goto table */
        !           206: 
        !           207:        /* temporary vector, indexable by states, terms, or ntokens */
        !           208: 
        !           209: extern int temp1[];
        !           210: extern int lineno; /* current line number */
        !           211: 
        !           212:        /* statistics collection variables */
        !           213: 
        !           214: extern int zzgoent ;
        !           215: extern int zzgobest ;
        !           216: extern int zzacent ;
        !           217: extern int zzexcp ;
        !           218: extern int zzclose ;
        !           219: extern int zzrrconf ;
        !           220: extern int zzsrconf ;
        !           221:        /* define functions with strange types... */
        !           222: 
        !           223: extern char *cstash();
        !           224: extern struct looksets *flset();
        !           225: extern char *symnam();
        !           226: extern char *writem();
        !           227: 
        !           228:        /* default settings for a number of macros */
        !           229: 
        !           230:        /* name of yacc tempfiles */
        !           231: 
        !           232: # ifndef TEMPNAME
        !           233: # define TEMPNAME "yacc.tmp"
        !           234: # endif
        !           235: 
        !           236: # ifndef ACTNAME
        !           237: # define ACTNAME "yacc.acts"
        !           238: # endif
        !           239: 
        !           240:        /* output file name */
        !           241: 
        !           242: # ifndef OFILE
        !           243: # define OFILE "y.tab.c"
        !           244: # endif
        !           245: 
        !           246:        /* user output file name */
        !           247: 
        !           248: # ifndef FILEU
        !           249: # define FILEU "y.output"
        !           250: # endif
        !           251: 
        !           252:        /* output file for # defines */
        !           253: 
        !           254: # ifndef FILED
        !           255: # define FILED "y.tab.h"
        !           256: # endif
        !           257: 
        !           258:        /* command to clobber tempfiles after use */
        !           259: 
        !           260: # ifndef ZAPFILE
        !           261: # define ZAPFILE(x) unlink(x)
        !           262: # endif

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