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bpo-37499: Test various C calling conventions (GH-15776)

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Add functions with various calling conventions to `_testcapi`, expose them as module-level functions, bound methods, class methods, and static methods, and test calling them and introspecting them through GDB.


https://bugs.python.org/issue37499


Co-authored-by: Jeroen Demeyer <J.Demeyer@UGent.be>
Automerge-Triggered-By: @pganssle
This commit is contained in:
Petr Viktorin 2019-09-10 12:21:09 +01:00 • committed by Miss Islington (bot)
parent f1a297acb6
commit f958377b67
3 changed files with 433 additions and 193 deletions
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79
Lib/test/test_gdb.py
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@ -838,47 +838,66 @@ id(42)
)
self.assertIn('Garbage-collecting', gdb_output)
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
# 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'
# Various optimizations multiply the code paths by which these are
# called, so test a variety of calling conventions.
for py_name, py_args, c_name, expected_frame_number in (
('gmtime', '', 'time_gmtime', 1), # METH_VARARGS
('len', '[]', 'builtin_len', 1), # METH_O
('locals', '', 'builtin_locals', 1), # METH_NOARGS
('iter', '[]', 'builtin_iter', 1), # METH_FASTCALL
('sorted', '[]', 'builtin_sorted', 1), # METH_FASTCALL|METH_KEYWORDS
for func_name, args, expected_frame in (
('meth_varargs', '', 1),
('meth_varargs_keywords', '', 1),
('meth_o', '[]', 1),
('meth_noargs', '', 1),
('meth_fastcall', '', 1),
('meth_fastcall_keywords', '', 1),
):
with self.subTest(c_name):
cmd = ('from time import gmtime\n' # (not always needed)
'def foo():\n'
f' {py_name}({py_args})\n'
'def bar():\n'
' foo()\n'
'bar()\n')
# Verify with "py-bt":
gdb_output = self.get_stack_trace(
cmd,
breakpoint=c_name,
cmds_after_breakpoint=['bt', 'py-bt'],
)
self.assertIn(f'<built-in method {py_name}', gdb_output)
for obj in (
'_testcapi',
'_testcapi.MethClass',
'_testcapi.MethClass()',
'_testcapi.MethStatic()',
# Verify with "py-bt-full":
gdb_output = self.get_stack_trace(
cmd,
breakpoint=c_name,
cmds_after_breakpoint=['py-bt-full'],
)
self.assertIn(
f'#{expected_frame_number} <built-in method {py_name}',
gdb_output,
)
# 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'],
)
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'],
)
self.assertIn(
f'#{expected_frame} <built-in method {func_name}',
gdb_output,
)
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")