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505bf312 | 1 | /*- |
e0f0d8c7 KB |
2 | * Copyright (c) 1980, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
505bf312 KB |
4 | * |
5 | * %sccs.include.redist.c% | |
f644bb55 | 6 | */ |
ff1b71cf | 7 | |
f644bb55 | 8 | #ifndef lint |
e0f0d8c7 | 9 | static char sccsid[] = "@(#)functab.c 8.1 (Berkeley) %G%"; |
505bf312 KB |
10 | #endif /* not lint */ |
11 | ||
ff1b71cf ML |
12 | /* |
13 | * This file contains the implementation of a table for going | |
14 | * from object addresses to the functions in which they belong. | |
15 | */ | |
16 | ||
17 | #include "defs.h" | |
18 | #include "mappings.h" | |
19 | #include "sym.h" | |
20 | ||
21 | #define MAXNFUNCS 1001 /* maximum number of functions allowed */ | |
22 | ||
23 | LOCAL SYM *functab[MAXNFUNCS]; | |
24 | LOCAL int nfuncs; | |
25 | ||
26 | /* | |
27 | * Insert a new function into the table. | |
28 | * The table is ordered by object address. | |
29 | */ | |
30 | ||
31 | newfunc(f) | |
32 | SYM *f; | |
33 | { | |
34 | register int i, j; | |
35 | ADDRESS a; | |
36 | ||
37 | if (nfuncs >= MAXNFUNCS) { | |
38 | panic("too many procedures/functions"); | |
39 | } | |
40 | a = codeloc(f); | |
41 | i = 0; | |
42 | while (i < nfuncs && codeloc(functab[i]) < a) { | |
43 | i++; | |
44 | } | |
45 | for (j = nfuncs; j > i; j--) { | |
46 | functab[j] = functab[j - 1]; | |
47 | } | |
48 | functab[i] = f; | |
49 | nfuncs++; | |
50 | } | |
51 | ||
52 | /* | |
53 | * Return the function that begins at the given address. | |
54 | */ | |
55 | ||
56 | SYM *whatblock(addr) | |
57 | ADDRESS addr; | |
58 | { | |
ff1b71cf ML |
59 | register int i, j, k; |
60 | ADDRESS a; | |
61 | ||
62 | i = 0; | |
63 | j = nfuncs - 1; | |
64 | if (addr < codeloc(functab[i])) { | |
65 | return program; | |
66 | } else if (addr == codeloc(functab[i])) { | |
67 | return functab[i]; | |
68 | } else if (addr >= codeloc(functab[j])) { | |
69 | return functab[j]; | |
70 | } | |
71 | while (i <= j) { | |
72 | k = (i + j) / 2; | |
73 | a = codeloc(functab[k]); | |
74 | if (a == addr) { | |
75 | return functab[k]; | |
76 | } else if (addr > a) { | |
77 | i = k+1; | |
78 | } else { | |
79 | j = k-1; | |
80 | } | |
81 | } | |
82 | if (addr > codeloc(functab[i])) { | |
83 | return functab[i]; | |
84 | } else { | |
85 | return functab[i-1]; | |
86 | } | |
87 | /* NOTREACHED */ | |
88 | } | |
89 | ||
90 | /* | |
91 | * Clear out the functab, used when re-reading the object information. | |
92 | */ | |
93 | ||
94 | clrfunctab() | |
95 | { | |
96 | nfuncs = 0; | |
97 | } |