gdb/testsuite/gdb.python/py-breakpoint-create-fail.exp

   1 # Copyright (C) 2016-2020 Free Software Foundation, Inc.
   2 #
   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.
   7 #
   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.
  12 #
  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/>.
  15
  16 # This file is part of the GDB testsuite.  It tests proper handling for
  17 # breakpoint creation failure.
  18
  19 load_lib gdb-python.exp
  20
  21 standard_testfile
  22
  23 if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
  24     return -1
  25 }
  26
  27 # Skip all tests if Python scripting is not enabled.
  28 if { [skip_python_tests] } { continue }
  29
  30 clean_restart "${testfile}"
  31 if ![runto_main] {
  32     perror "could not run to main"
  33     continue
  34 }
  35
  36 # The following will create a breakpoint Python wrapper whose construction will
  37 # abort: the requested symbol is not defined.  GDB should not keep a reference
  38 # to the wrapper; however it used to...
  39 gdb_test "source py-breakpoint-create-fail.py"
  40
  41 # ... and when it did, as a result, the following breakpoint creation (not
  42 # initiated by the Python API) would dereference the already-freed Python
  43 # breakpoint wrapper, resulting in undefined behavior, sometimes observed as a
  44 # gdb crash, and other times causing the next stop to invoke the Python wrapper
  45 # "stop" method for the object that is not supposed to exist.
  46 gdb_test "break foo"
  47
  48 set test "continuing to foo"
  49 gdb_test_multiple "continue" "$test" {
  50     -re "MyBP\.stop was invoked\!.*$gdb_prompt $" {
  51         fail "$test"
  52     }
  53     -re "Continuing.*Breakpoint 2, foo.*$gdb_prompt $" {
  54         pass "$test"
  55     }
  56 }