projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 629188b5 JR |
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++ ) |