66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/* This test program is part of GDB, the GNU debugger.
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Copyright 2015-2016 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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typedef void (*callback_t) (void);
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extern void process (callback_t cb);
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extern void parent (int first, callback_t cb);
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void
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ignore (int unused)
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{
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(void) unused;
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}
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void
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process (callback_t cb)
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{
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parent (0, cb);
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}
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void
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parent (int first, callback_t cb)
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{
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void child (void)
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{
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/* When reaching this, there are two block instances for PARENT on the
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stack: the one that is right in the upper frame is not the one actually
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used for non-local references, so GDB has to follow the static link in
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order to get the correct instance, and thus in order to read the proper
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variables.
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As a simple check, we can verify that under GDB, the following is true:
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parent_first == first (which should be one: see the IF block below). */
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const int parent_first = first;
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ignore (parent_first); /* STOP */
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ignore (first);
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}
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if (first)
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process (&child);
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else
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cb ();
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}
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int
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main ()
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{
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parent (1, NULL);
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return 0;
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}
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