| 1 | /* This test program is part of GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 2015-2017 Free Software Foundation, Inc. |
| 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 | } |