Commit | Line | Data |
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07d021a6 JG |
1 | /* More debugging hooks for `malloc'. |
2 | Copyright 1991 Free Software Foundation | |
3 | Written April 2, 1991 by John Gilmore of Cygnus Support | |
4 | Based on mcheck.c by Mike Haertel. | |
5 | ||
99a7de40 JG |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
07d021a6 JG |
19 | |
20 | #include <stdio.h> | |
21 | #include "ansidecl.h" | |
7b54d319 JK |
22 | |
23 | /* size_t may be defined in the system-supplied stdio.h. */ | |
24 | /* So just kludge it. */ | |
25 | #define size_t unsigned int | |
26 | #define ptrdiff_t int | |
27 | #define __ONEFILE | |
28 | ||
07d021a6 JG |
29 | #include <stdlib.h> |
30 | #include "gmalloc.h" | |
31 | ||
32 | extern char *getenv(); | |
33 | ||
34 | FILE *mallstream; | |
35 | char mallenv[] = "MALLOC_TRACE"; | |
36 | static char mallbuf[BUFSIZ]; /* Buffer for the output */ | |
37 | ||
38 | /* Address to breakpoint on accesses to... */ | |
39 | PTR mallwatch; | |
40 | ||
41 | /* Old hook values. */ | |
42 | static void EXFUN((*old_free_hook), (PTR ptr)); | |
43 | static PTR EXFUN((*old_malloc_hook), (size_t size)); | |
44 | static PTR EXFUN((*old_realloc_hook), (PTR ptr, size_t size)); | |
45 | ||
46 | /* This function is called when the block being alloc'd, realloc'd, or | |
47 | freed has an address matching the variable "mallwatch". In a debugger, | |
48 | set "mallwatch" to the address of interest, then put a breakpoint on | |
49 | tr_break. */ | |
50 | ||
51 | void | |
52 | tr_break() | |
53 | { | |
54 | ; | |
55 | } | |
56 | ||
57 | static void | |
58 | DEFUN(tr_freehook, (ptr), PTR ptr) | |
59 | { | |
60 | fprintf(mallstream, "- %08x\n", ptr); /* Be sure to print it first */ | |
61 | if (ptr == mallwatch) | |
62 | tr_break(); | |
63 | __free_hook = old_free_hook; | |
64 | free(ptr); | |
65 | __free_hook = tr_freehook; | |
66 | } | |
67 | ||
68 | static PTR | |
69 | DEFUN(tr_mallochook, (size), size_t size) | |
70 | { | |
71 | PTR hdr; | |
72 | ||
73 | __malloc_hook = old_malloc_hook; | |
74 | hdr = malloc(size); | |
75 | __malloc_hook = tr_mallochook; | |
76 | ||
77 | /* We could be printing a NULL here; that's OK */ | |
78 | fprintf (mallstream, "+ %08x %x\n", hdr, size); | |
79 | ||
80 | if (hdr == mallwatch) | |
81 | tr_break(); | |
82 | ||
83 | return hdr; | |
84 | } | |
85 | ||
86 | static PTR | |
87 | DEFUN(tr_reallochook, (ptr, size), PTR ptr AND size_t size) | |
88 | { | |
89 | PTR hdr; | |
90 | ||
91 | if (ptr == mallwatch) | |
92 | tr_break(); | |
93 | ||
94 | __free_hook = old_free_hook; | |
95 | __malloc_hook = old_malloc_hook; | |
96 | __realloc_hook = old_realloc_hook; | |
97 | hdr = realloc(ptr, size); | |
98 | __free_hook = tr_freehook; | |
99 | __malloc_hook = tr_mallochook; | |
100 | __realloc_hook = tr_reallochook; | |
101 | if (hdr == NULL) { | |
102 | fprintf (mallstream, "! %08x %x\n", ptr, size); /* Failed realloc */ | |
103 | } else { | |
104 | fprintf (mallstream, "< %08x\n> %08x %x\n", ptr, hdr, size); | |
105 | } | |
106 | ||
107 | if (hdr == mallwatch) | |
108 | tr_break(); | |
109 | ||
110 | return hdr; | |
111 | } | |
112 | ||
113 | void | |
114 | mtrace() | |
115 | { | |
116 | char *mallfile; | |
117 | ||
118 | mallfile = getenv (mallenv); | |
119 | if (mallfile) { | |
120 | mallstream = fopen (mallfile, "w"); | |
121 | if (mallstream) { | |
122 | /* Be sure it doesn't malloc its buffer! */ | |
123 | setbuf (mallstream, mallbuf); | |
124 | fprintf (mallstream, "= Start\n"); | |
125 | old_free_hook = __free_hook; | |
126 | __free_hook = tr_freehook; | |
127 | old_malloc_hook = __malloc_hook; | |
128 | __malloc_hook = tr_mallochook; | |
129 | old_realloc_hook = __realloc_hook; | |
130 | __realloc_hook = tr_reallochook; | |
131 | } | |
132 | } | |
133 | } |