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git.ipfire.org Git - thirdparty/binutils-gdb.git/blob - gdb/testsuite/gdb.python/py-recurse-unwind.py
1 # Copyright (C) 2016 Free Software Foundation, Inc.
3 # This program is free software; you can redistribute it and/or modify
4 # it under the terms of the GNU General Public License as published by
5 # the Free Software Foundation; either version 3 of the License, or
6 # (at your option) any later version.
8 # This program is distributed in the hope that it will be useful,
9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 # GNU General Public License for more details.
13 # You should have received a copy of the GNU General Public License
14 # along with this program. If not, see <http://www.gnu.org/licenses/>.
16 # This unwinder never does any unwinding. It'll (pretend to) "sniff"
17 # the frame and ultimately return None, indicating that actual unwinding
18 # should be performed by some other unwinder.
20 # But, prior to returning None, it will attempt to obtain the value
21 # associated with a symbol via a call to gdb.parse_and_eval(). In
22 # the course of doing this evaluation, GDB will potentially access
23 # some frames, leading to the possibility of a recursive invocation of
24 # this unwinder. If that should happen, code contained herein detects
25 # that and prints a message which will cause some of the associated
29 from gdb
.unwinder
import Unwinder
31 class TestUnwinder(Unwinder
):
36 def reset_count (cls
):
44 Unwinder
.__init
__(self
, "test unwinder")
45 self
.recurse_level
= 0
47 def __call__(self
, pending_frame
):
50 if self
.recurse_level
> 0:
51 gdb
.write("TestUnwinder: Recursion detected - returning early.\n")
54 self
.recurse_level
+= 1
55 TestUnwinder
.inc_count()
58 val
= gdb
.parse_and_eval("undefined_symbol")
60 except Exception as arg
:
63 self
.recurse_level
-= 1
67 gdb
.unwinder
.register_unwinder(None, TestUnwinder(), True)
68 gdb
.write("Python script imported\n")