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# Copyright (C) 2016 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This file is part of the GDB testsuite. It is used to verify that
# GDB does not recurse infinitely when calling gdb.parse_and_eval() in
# the course of sniffing a frame in a Python unwinder.
# The unwinder has been constructed so that, should recursion occur,
# it will be detected in the unwinder so that we won't need to wait
# for a timeout.
load_lib gdb-python.exp
standard_testfile
if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
return -1
}
# Skip all tests if Python scripting is not enabled.
if { [skip_python_tests] } { continue }
set pyfile [gdb_remote_download host ${srcdir}/${subdir}/${testfile}.py]
gdb_test "source ${pyfile}" "Python script imported" \
"import python scripts"
# The following tests require execution.
if ![runto_main] then {
fail "can't run to main"
return 0
}
proc cont_and_backtrace { tst } {
with_test_prefix $tst {
gdb_breakpoint "ccc"
# We're testing different code paths within the unwinder's sniffer.
# Set the current path to be tested here.
gdb_test_no_output "python TestUnwinder.set_test(\"$tst\")" \
"set code path within python unwinder to $tst"
# If the unwinder is active, the usage count will increment while
# running to the breakpoint. Reset it prior to doing the backtrace.
gdb_test_no_output "python TestUnwinder.reset_count()" \
"reset count"
gdb_continue_to_breakpoint "ccc"
# The python based unwinder should be called a number of times while
# generating the backtrace, but its sniffer always returns None. So
# it doesn't really contribute to generating any of the frames below.
#
# But that's okay. Our goal here is to make sure that GDB doesn't
# get hung up in potentially infinite recursion when invoking the
# Python-based unwinder.
gdb_test_sequence "bt" "backtrace" {
"\\r\\n#0 .* ccc \\(arg=789\\) at "
"\\r\\n#1 .* bbb \\(arg=456\\) at "
"\\r\\n#2 .* aaa \\(arg=123\\) at "
"\\r\\n#3 .* main \\(.*\\) at"
}
# Test that the python-based unwinder / sniffer was actually called
# during generation of the backtrace.
gdb_test "python print(TestUnwinder.count > 0)" "True" \
"python unwinder called"
}
}
cont_and_backtrace "check_undefined_symbol"
cont_and_backtrace "check_user_reg_pc"
cont_and_backtrace "check_pae_pc"
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