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Annotation of 3BSD/cmd/as/assyms.h, revision 1.1

1.1     ! root        1: /* Copyright (c) 1979 Regents of the University of California */
        !             2: /*
        !             3:  *     To speed up walks through symbols defined in a particular
        !             4:  *     segment, we buil up a table of pointers into the symbol table
        !             5:  *     and a table of delimiters for each segment.  The delimiter for
        !             6:  *     the particular segment points to the first word in that segment.
        !             7:  */
        !             8: 
        !             9: struct symtab  **symptrs;              /*dynamically allocated*/
        !            10: struct symtab  **symdelim[NLOC + NLOC + 1];
        !            11: struct symtab  *hshtab[NHASH];
        !            12: struct symtab  **symptrub;
        !            13:        int     nsyms;                  /*number in the symbol table*/
        !            14:        int     njxxx;                  /*the number of jxxx entries in the table*/
        !            15:        int     nforgotten;             /*how many entries erroneously entered*/
        !            16:        int     nlabels;                /*how many labels in the symbol table*/
        !            17:        int     hshused;                /*how many hash slots used*/
        !            18: 
        !            19: #define SEGITERATE(segno, start, end, copointer, walkpointer, ubpointer, direction) \
        !            20:        for(copointer = start == 0? symdelim[segno]:start,\
        !            21:            ubpointer = end == 0 ? *symdelim[segno+1] : *(symdelim[segno]-1),\
        !            22:            walkpointer = *copointer;\
        !            23:            walkpointer != ubpointer;\
        !            24:            walkpointer = * direction copointer)
        !            25: 
        !            26: #define SYMITERATE(copointer, walkpointer) \
        !            27:        for(copointer = symptrs, \
        !            28:            walkpointer = *copointer; \
        !            29:            copointer < symptrub; \
        !            30:            walkpointer = * ++ copointer)
        !            31: /*
        !            32:  *     Symbols are allocated in non contiguous chunks by extending
        !            33:  *     the data area.  This way, it is extremely easy to
        !            34:  *     allow virtual memory temporary files, change the length
        !            35:  *     of NCPS, and allows for a much more flexible storage
        !            36:  *     allocation
        !            37:  */
        !            38: 
        !            39: #define SYMDALLOP      200
        !            40: struct         allocbox{
        !            41:        struct          allocbox        *nextalloc;
        !            42:        struct          symtab          symslots[SYMDALLOP];
        !            43:        char                            symnames[SYMDALLOP * NCPS];
        !            44: };
        !            45: 
        !            46: extern struct  allocbox        *allochead;
        !            47: extern struct  allocbox        *alloctail;
        !            48: extern struct  symtab          *nextsym;
        !            49: extern struct  allocbox        *newbox;
        !            50: extern char                    *namebuffer;
        !            51: extern int                     symsleft;
        !            52: 
        !            53: #define ALLOCQTY       sizeof (struct allocbox)
        !            54: /*
        !            55:  *     Iterate through all symbols in the symbol table in declaration
        !            56:  *     order
        !            57:  */
        !            58: #define DECLITERATE(allocwalk, walkpointer, ubpointer) \
        !            59:        for(allocwalk = allochead; \
        !            60:            allocwalk != 0; \
        !            61:            allocwalk = allocwalk->nextalloc) \
        !            62:                for (walkpointer = &allocwalk->symslots[0],\
        !            63:                        ubpointer = &allocwalk->symslots[SYMDALLOP], \
        !            64:                        ubpointer = ubpointer > ( (struct symtab *)alloctail) \
        !            65:                                 ? nextsym : ubpointer ;\
        !            66:                     walkpointer < ubpointer; \
        !            67:                     walkpointer++ )

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