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Annotation of 40BSD/cmd/as/asscan.h, revision 1.1.1.1

1.1       root        1: /* Copyright (c) 1980 Regents of the University of California */
                      2: /* "@(#)asscan.h 4.3 8/15/80" */
                      3: /*
                      4:  *     The character scanner is called to fill up one token buffer
                      5:  *
                      6:  *     However, once the tokens are filled up by the
                      7:  *     character scanner, they are used in both the first and the second
                      8:  *     pass.  Holes created by .stab removal are replaced
                      9:  *     with 'skip' tokens that direct the second pass to ignore the
                     10:  *     following tokens.
                     11:  */
                     12: 
                     13: #define TOKBUFLG               BUFSIZ
                     14: #define MAXVAX                 32              
                     15: #define SAFETY                 16
                     16: 
                     17: #define AVAILTOKS              TOKBUFLG -\
                     18:                sizeof(int) -\
                     19:                sizeof (struct tokbufdesc *) -\
                     20:                MAXVAX - SAFETY
                     21: 
                     22: struct tokbufdesc{
                     23:        int             tok_count;              /*absolute byte length*/
                     24:        struct          tokbufdesc *tok_next;
                     25:        char            toks[AVAILTOKS];
                     26:        char            bufovf[MAXVAX + SAFETY];
                     27: };
                     28: /*
                     29:  *     Definitions for handling tokens in the intermediate file
                     30:  *     buffers.
                     31:  *
                     32:  *     We want to have the compiler produce the efficient auto increment
                     33:  *     instruction for stepping through the buffer of tokens.  We must
                     34:  *     fool the type checker into thinking that a pointer can point
                     35:  *     to various size things.
                     36:  */
                     37: 
                     38: typedef char toktype;
                     39: 
                     40: typedef char *ptrall;                  /*all uses will be type cast*/
                     41: typedef short lgtype;                  /*for storing length of strings or skiping*/
                     42: /*
                     43:  *     defintions for putting various typed values
                     44:  *     into the intermediate buffers
                     45:  *     ptr will ALWAYS be of type ptrall
                     46:  */
                     47: 
                     48: #define        pchar(ptr,val)          *ptr++  = val
                     49: #define        puchar(ptr,val)         *ptr++  = val
                     50: 
                     51: #define        pshort(ptr,val)         *(short *)ptr=val,      ptr += sizeof(short)
                     52: #define        pushort(ptr,val)        *(unsigned short *)ptr=val,     ptr += sizeof(short)
                     53: #define        pint(ptr,val)           *(int *)ptr  = val,     ptr += sizeof(int)
                     54: #define        puint(ptr,val)          *(unsigned int *)ptr=val,       ptr += sizeof(int)
                     55: #define        plong(ptr,val)          *(long *)ptr  = val,    ptr += sizeof(long)
                     56: #define        pulong(ptr,val)         *(unsigned long *)ptr=val,      ptr += sizeof(long)
                     57: #define        pfloat(ptr,val)         *(float *)ptr  = val,   ptr += sizeof (float)
                     58: #define        pdouble(ptr,val)        *(double *)ptr  = val,  ptr += sizeof (double)
                     59: #define        pptr(ptr,val)           *(int *)ptr  = (val),   ptr += sizeof(ptrall)
                     60: #define        ptoken(ptr,val)         *ptr++  = val
                     61: #define        pstrlg(ptr,val)         *(lgtype *)ptr  = val,  ptr += sizeof(short)
                     62: #define        pskiplg(ptr,val)        *(lgtype *)ptr  = val,  ptr += sizeof(short)
                     63: 
                     64: #define        gchar(val, ptr)         val = *ptr++
                     65: #define        guchar(val, ptr)        val = *ptr++
                     66: 
                     67: #define        gshort(val, ptr)        val = *(short *)ptr , ptr += sizeof (short)
                     68: #define        gushort(val, ptr)       val = *(unsigned short *)ptr , ptr += sizeof (short)
                     69: #define        gint(val, ptr)          val = *(int *)ptr, ptr += sizeof (int)
                     70: #define        guint(val, ptr)         val = *(unsigend int *)ptr, ptr += sizeof (int)
                     71: #define        glong(val, ptr)         val = *(long *)ptr, ptr += sizeof (long)
                     72: #define        gulong(val, ptr)        val = *(unsigned long *)ptr, ptr += sizeof (long)
                     73: #define        gfloat(val, ptr)        val = *(float *)ptr, ptr += sizeof (float)
                     74: #define        gdouble(val, ptr)       val = *(double *)ptr, ptr += sizeof (double)
                     75: #define        gptr(val, ptr)          val = *(int *)ptr, ptr += sizeof (ptrall)
                     76: #define        gtoken(val, ptr)        val = *ptr++
                     77: #define        gstrlg(val, ptr)        val = *(lgtype *)ptr, ptr += sizeof (short)
                     78: #define        gskiplg(val, ptr)       val = *(lgtype *)ptr, ptr += sizeof (short)
                     79: 
                     80: 
                     81: extern ptrall tokptr;  /*the next token to consume, call by copy*/
                     82: extern ptrall tokub;   /*current upper bound in the current buffer*/
                     83: 
                     84: /*
                     85:  *     Strings are known for their characters and for their length.
                     86:  *     We cannot use a normal zero termination byte, because strings
                     87:  *     can contain anything.
                     88:  *
                     89:  *     We have two "strings", so that an input string that is too long can be
                     90:  *     split across two string buffers, and not confuse the yacc grammar.
                     91:  *     (This is probably superflous)
                     92:  *
                     93:  *     We have a third string of nulls so that the .skip can be 
                     94:  *     handled in the same way as strings.
                     95:  */
                     96: #define MAXSTRLG       127
                     97: 
                     98: struct strdesc{
                     99:        char            str_lg;
                    100:        char            str[MAXSTRLG];
                    101: };
                    102: 
                    103: extern struct  strdesc         strbuf[3];
                    104: extern struct  strdesc         *strptr;        /*points to the current string*/
                    105: extern int                     strno;          /*the current string being filled*/
                    106: char   *savestr();

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