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Annotation of 40BSD/cmd/yacc/dextern, revision 1.1

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

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