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Annotation of 40BSD/cmd/eyacc/ey0.c, revision 1.1

1.1     ! root        1: /* (c) 1979 Regents of the University of California */
        !             2: #include <stdio.h>
        !             3: # define _actsize 2500
        !             4: # define _memsize 3000
        !             5: # define _nstates 700
        !             6: # define _nterms 95
        !             7: # define _nprod 300
        !             8: # define _nnonterm 150
        !             9: # define _tempsize 700
        !            10: # define _cnamsz 3500
        !            11: # define _lsetsize 600
        !            12: # define _wsetsize 400
        !            13: 
        !            14: # define _tbitset 6
        !            15: 
        !            16: int tbitset;  /* size of lookahed sets */
        !            17: int nolook = 0; /* flag to suppress lookahead computations */
        !            18: struct looksets { int lset[ _tbitset ]; } ;
        !            19: struct item { int *pitem; } ;
        !            20: 
        !            21: /* this file contains the definitions for most externally known data */
        !            22: 
        !            23: int nstate = 0;                /* number of states */
        !            24: struct item *pstate[_nstates]; /* pointers to the descriptions of the states */
        !            25: int apstate[_nstates]; /* index to the actions for the states */
        !            26: int tystate[_nstates]; /* contains type information about the states */
        !            27: int stsize = _nstates; /* maximum number of states, at present */
        !            28: int memsiz = _memsize; /* maximum size for productions and states */
        !            29: int mem0[_memsize] ; /* production storage */
        !            30: int *mem = mem0;
        !            31: int amem[_actsize];  /* action table storage */
        !            32: int actsiz = _actsize; /* action table size */
        !            33: int memact = 0;                /* next free action table position */
        !            34: int nprod = 1; /* number of productions */
        !            35: int *prdptr[_nprod];   /* pointers to descriptions of productions */
        !            36: int prdlim = _nprod ;  /* the maximum number of productions */
        !            37:        /* levprd - productions levels to break conflicts */
        !            38: int levprd[_nprod] = {0,0};
        !            39:   /* last two bits code associativity:
        !            40:        0 = no definition
        !            41:        1 = left associative
        !            42:        2 = binary
        !            43:        3 = right associative
        !            44:      bit 04 is 1 if the production has an action
        !            45:      the high 13 bits have the production level
        !            46:      */
        !            47: int nterms = 0;        /* number of terminals */
        !            48: int tlim = _nterms ; /* the maximum number of terminals */
        !            49: /*     the ascii representations of the terminals      */
        !            50: int extval = 0;  /* start of output values */
        !            51: struct sxxx1 {char *name; int value;} trmset[_nterms];
        !            52: char cnames[_cnamsz];
        !            53: int cnamsz = _cnamsz;
        !            54: char *cnamp;
        !            55: int maxtmp = _tempsize;        /* the size of the temp1 array */
        !            56: int temp1[_tempsize]; /* temporary storage, indexed by terms + nterms or states */
        !            57: int temp2[_nnonterm]; /* temporary storage indexed by nonterminals */
        !            58: int trmlev[_nterms];   /* vector with the precedence of the terminals */
        !            59:   /* The levels are the same as for levprd, but bit 04 is always 0 */
        !            60: /* the ascii representations of the nonterminals */
        !            61: struct sxxx2 { char *name; } nontrst[_nnonterm];
        !            62: int ntlim = _nnonterm ; /* limit to the number of nonterminals */
        !            63: int indgo[_nstates];           /* index to the stored goto table */
        !            64: int ***pres; /* vector of pointers to the productions yielding each nonterminal */
        !            65: struct looksets **pfirst; /* vector of pointers to first sets for each nonterminal */
        !            66: int *pempty = 0 ; /* table of nonterminals nontrivially deriving e */
        !            67: int nnonter = -1;      /* the number of nonterminals */
        !            68: int lastred = 0;       /* the number of the last reduction of a state */
        !            69: FILE *ftable;          /* y.tab.c file */
        !            70: FILE *foutput;         /* y.output file */
        !            71: int arrndx; /* used in the output of arrays on y.tab.c */
        !            72: int zzcwset = 0;
        !            73: int zzpairs = 0;
        !            74: int zzgoent = 0;
        !            75: int zzgobest = 0;
        !            76: int zzacent = 0;
        !            77: int zzacsave = 0;
        !            78: int zznsave = 0;
        !            79: int zzclose = 0;
        !            80: int zzsrconf = 0;
        !            81: int zzrrconf = 0;
        !            82: char *ctokn;
        !            83: int lineno  = 1; /* current input line number */
        !            84: int peekc = -1; /* look-ahead character */
        !            85: int tstates[ _nterms ]; /* states generated by terminal gotos */
        !            86: int ntstates[ _nnonterm ]; /* states generated by nonterminal gotos */
        !            87: int mstates[ _nstates ]; /* chain of overflows of term/nonterm generation lists  */
        !            88: 
        !            89: struct looksets clset;
        !            90: struct looksets lkst [ _lsetsize ];
        !            91: int nlset = 0; /* next lookahead set index */
        !            92: int lsetsz = _lsetsize; /* number of lookahead sets */
        !            93: 
        !            94: struct wset { int *pitem, flag, ws[_tbitset]; } wsets[ _wsetsize ];
        !            95: int cwset;
        !            96: int wssize = _wsetsize;
        !            97: 
        !            98: int numbval;  /* the value of an input number */
        !            99: int rflag = 0;  /* ratfor flag */
        !           100: int oflag = 0;  /* optimization flag */
        !           101: 
        !           102: int ndefout = 3;  /* number of defined symbols output */
        !           103: int nerrors = 0;       /* number of errors */
        !           104: int fatfl = 1;         /* if on, error is fatal */
        !           105: int machine;   /* has a number describing the machine */
        !           106: 

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