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63e43d3a PMR |
1 | /* This test program is part of GDB, the GNU debugger. |
2 | ||
618f726f | 3 | Copyright 2015-2016 Free Software Foundation, Inc. |
63e43d3a PMR |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <stdlib.h> | |
19 | ||
20 | typedef void (*callback_t) (void); | |
21 | ||
22 | extern void process (callback_t cb); | |
23 | extern void parent (int first, callback_t cb); | |
24 | ||
25 | void | |
26 | ignore (int unused) | |
27 | { | |
28 | (void) unused; | |
29 | } | |
30 | ||
31 | void | |
32 | process (callback_t cb) | |
33 | { | |
34 | parent (0, cb); | |
35 | } | |
36 | ||
37 | void | |
38 | parent (int first, callback_t cb) | |
39 | { | |
40 | void child (void) | |
41 | { | |
42 | /* When reaching this, there are two block instances for PARENT on the | |
43 | stack: the one that is right in the upper frame is not the one actually | |
44 | used for non-local references, so GDB has to follow the static link in | |
45 | order to get the correct instance, and thus in order to read the proper | |
46 | variables. | |
47 | ||
48 | As a simple check, we can verify that under GDB, the following is true: | |
49 | parent_first == first (which should be one: see the IF block below). */ | |
50 | const int parent_first = first; | |
51 | ignore (parent_first); /* STOP */ | |
52 | ignore (first); | |
53 | } | |
54 | ||
55 | if (first) | |
56 | process (&child); | |
57 | else | |
58 | cb (); | |
59 | } | |
60 | ||
61 | int | |
62 | main () | |
63 | { | |
64 | parent (1, NULL); | |
65 | return 0; | |
66 | } |