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Annotation of 41BSD/cmd/eyacc/ey0.c, revision 1.1.1.1

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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