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import re
import textwrap
import unittest
from test import support
from test.support import python_is_optimized
from .util import setup_module, DebuggerTests
def setUpModule():
setup_module()
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
@support.requires_resource('cpu')
class CFunctionTests(DebuggerTests):
# Some older versions of gdb will fail with
# "Cannot find new threads: generic error"
# unless we add LD_PRELOAD=PATH-TO-libpthread.so.1 as a workaround
#
# gdb will also generate many erroneous errors such as:
# Function "meth_varargs" not defined.
# This is because we are calling functions from an "external" module
# (_testcapimodule) rather than compiled-in functions. It seems difficult
# to suppress these. See also the comment in DebuggerTests.get_stack_trace
def test_pycfunction(self):
'Verify that "py-bt" displays invocations of PyCFunction instances'
# bpo-46600: If the compiler inlines _null_to_none() in meth_varargs()
# (ex: clang -Og), _null_to_none() is the frame #1. Otherwise,
# meth_varargs() is the frame #1.
expected_frame = r'#(1|2)'
# Various optimizations multiply the code paths by which these are
# called, so test a variety of calling conventions.
for func_name, args in (
('meth_varargs', ''),
('meth_varargs_keywords', ''),
('meth_o', '[]'),
('meth_noargs', ''),
('meth_fastcall', ''),
('meth_fastcall_keywords', ''),
):
for obj in (
'_testcapi',
'_testcapi.MethClass',
'_testcapi.MethClass()',
'_testcapi.MethStatic()',
# XXX: bound methods don't yet give nice tracebacks
# '_testcapi.MethInstance()',
):
with self.subTest(f'{obj}.{func_name}'):
cmd = textwrap.dedent(f'''
import _testcapi
def foo():
{obj}.{func_name}({args})
def bar():
foo()
bar()
''')
# Verify with "py-bt":
gdb_output = self.get_stack_trace(
cmd,
breakpoint=func_name,
cmds_after_breakpoint=['bt', 'py-bt'],
# bpo-45207: Ignore 'Function "meth_varargs" not
# defined.' message in stderr.
ignore_stderr=True,
)
self.assertIn(f'<built-in method {func_name}', gdb_output)
# Verify with "py-bt-full":
gdb_output = self.get_stack_trace(
cmd,
breakpoint=func_name,
cmds_after_breakpoint=['py-bt-full'],
# bpo-45207: Ignore 'Function "meth_varargs" not
# defined.' message in stderr.
ignore_stderr=True,
)
regex = expected_frame
regex += re.escape(f' <built-in method {func_name}')
self.assertRegex(gdb_output, regex)
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