projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| ff1b71cf ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
| 2 | ||
| 3 | static char sccsid[] = "@(#)functab.c 1.1 %G%"; | |
| 4 | ||
| 5 | /* | |
| 6 | * This file contains the implementation of a table for going | |
| 7 | * from object addresses to the functions in which they belong. | |
| 8 | */ | |
| 9 | ||
| 10 | #include "defs.h" | |
| 11 | #include "mappings.h" | |
| 12 | #include "sym.h" | |
| 13 | ||
| 14 | #define MAXNFUNCS 1001 /* maximum number of functions allowed */ | |
| 15 | ||
| 16 | LOCAL SYM *functab[MAXNFUNCS]; | |
| 17 | LOCAL int nfuncs; | |
| 18 | ||
| 19 | /* | |
| 20 | * Insert a new function into the table. | |
| 21 | * The table is ordered by object address. | |
| 22 | */ | |
| 23 | ||
| 24 | newfunc(f) | |
| 25 | SYM *f; | |
| 26 | { | |
| 27 | register int i, j; | |
| 28 | ADDRESS a; | |
| 29 | ||
| 30 | if (nfuncs >= MAXNFUNCS) { | |
| 31 | panic("too many procedures/functions"); | |
| 32 | } | |
| 33 | a = codeloc(f); | |
| 34 | i = 0; | |
| 35 | while (i < nfuncs && codeloc(functab[i]) < a) { | |
| 36 | i++; | |
| 37 | } | |
| 38 | for (j = nfuncs; j > i; j--) { | |
| 39 | functab[j] = functab[j - 1]; | |
| 40 | } | |
| 41 | functab[i] = f; | |
| 42 | nfuncs++; | |
| 43 | } | |
| 44 | ||
| 45 | /* | |
| 46 | * Return the function that begins at the given address. | |
| 47 | */ | |
| 48 | ||
| 49 | SYM *whatblock(addr) | |
| 50 | ADDRESS addr; | |
| 51 | { | |
| 52 | register SYM *p; | |
| 53 | register int i, j, k; | |
| 54 | ADDRESS a; | |
| 55 | ||
| 56 | i = 0; | |
| 57 | j = nfuncs - 1; | |
| 58 | if (addr < codeloc(functab[i])) { | |
| 59 | return program; | |
| 60 | } else if (addr == codeloc(functab[i])) { | |
| 61 | return functab[i]; | |
| 62 | } else if (addr >= codeloc(functab[j])) { | |
| 63 | return functab[j]; | |
| 64 | } | |
| 65 | while (i <= j) { | |
| 66 | k = (i + j) / 2; | |
| 67 | a = codeloc(functab[k]); | |
| 68 | if (a == addr) { | |
| 69 | return functab[k]; | |
| 70 | } else if (addr > a) { | |
| 71 | i = k+1; | |
| 72 | } else { | |
| 73 | j = k-1; | |
| 74 | } | |
| 75 | } | |
| 76 | if (addr > codeloc(functab[i])) { | |
| 77 | return functab[i]; | |
| 78 | } else { | |
| 79 | return functab[i-1]; | |
| 80 | } | |
| 81 | /* NOTREACHED */ | |
| 82 | } | |
| 83 | ||
| 84 | /* | |
| 85 | * Clear out the functab, used when re-reading the object information. | |
| 86 | */ | |
| 87 | ||
| 88 | clrfunctab() | |
| 89 | { | |
| 90 | nfuncs = 0; | |
| 91 | } |