mirror of
https://github.com/python/cpython.git
synced 2025-10-31 21:51:50 +00:00
747 lines
22 KiB
Python
747 lines
22 KiB
Python
import copy
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import operator
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import re
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import sys
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import textwrap
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import threading
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import unittest
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import weakref
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try:
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import _testcapi
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except ImportError:
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_testcapi = None
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from collections.abc import Mapping
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from test import support
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from test.support import import_helper, threading_helper
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from test.support.script_helper import assert_python_ok
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from test import mapping_tests
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class ClearTest(unittest.TestCase):
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"""
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Tests for frame.clear().
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"""
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def inner(self, x=5, **kwargs):
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1/0
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def outer(self, **kwargs):
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try:
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self.inner(**kwargs)
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except ZeroDivisionError as e:
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exc = e
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return exc
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def clear_traceback_frames(self, tb):
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"""
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Clear all frames in a traceback.
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"""
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while tb is not None:
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tb.tb_frame.clear()
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tb = tb.tb_next
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def test_clear_locals(self):
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class C:
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pass
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c = C()
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wr = weakref.ref(c)
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exc = self.outer(c=c)
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del c
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support.gc_collect()
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# A reference to c is held through the frames
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self.assertIsNot(None, wr())
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self.clear_traceback_frames(exc.__traceback__)
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support.gc_collect()
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# The reference was released by .clear()
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self.assertIs(None, wr())
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def test_clear_locals_after_f_locals_access(self):
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# see gh-113939
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class C:
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pass
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wr = None
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def inner():
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nonlocal wr
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c = C()
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wr = weakref.ref(c)
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1/0
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try:
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inner()
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except ZeroDivisionError as exc:
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support.gc_collect()
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self.assertIsNotNone(wr())
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exc.__traceback__.tb_next.tb_frame.clear()
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support.gc_collect()
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self.assertIsNone(wr())
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def test_clear_does_not_clear_specials(self):
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class C:
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pass
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c = C()
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exc = self.outer(c=c)
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del c
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f = exc.__traceback__.tb_frame
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f.clear()
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self.assertIsNot(f.f_code, None)
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self.assertIsNot(f.f_locals, None)
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self.assertIsNot(f.f_builtins, None)
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self.assertIsNot(f.f_globals, None)
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def test_clear_generator(self):
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endly = False
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def g():
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nonlocal endly
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try:
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yield
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self.inner()
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finally:
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endly = True
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gen = g()
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next(gen)
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self.assertFalse(endly)
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# Cannot clear a suspended frame
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with self.assertRaisesRegex(RuntimeError, r'suspended frame'):
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gen.gi_frame.clear()
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self.assertFalse(endly)
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def test_clear_executing(self):
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# Attempting to clear an executing frame is forbidden.
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try:
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1/0
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except ZeroDivisionError as e:
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f = e.__traceback__.tb_frame
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with self.assertRaises(RuntimeError):
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f.clear()
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with self.assertRaises(RuntimeError):
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f.f_back.clear()
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def test_clear_executing_generator(self):
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# Attempting to clear an executing generator frame is forbidden.
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endly = False
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def g():
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nonlocal endly
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try:
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1/0
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except ZeroDivisionError as e:
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f = e.__traceback__.tb_frame
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with self.assertRaises(RuntimeError):
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f.clear()
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with self.assertRaises(RuntimeError):
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f.f_back.clear()
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yield f
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finally:
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endly = True
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gen = g()
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f = next(gen)
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self.assertFalse(endly)
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# Cannot clear a suspended frame
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with self.assertRaisesRegex(RuntimeError, 'suspended frame'):
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f.clear()
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self.assertFalse(endly)
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def test_lineno_with_tracing(self):
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def record_line():
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f = sys._getframe(1)
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lines.append(f.f_lineno-f.f_code.co_firstlineno)
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def test(trace):
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record_line()
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if trace:
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sys._getframe(0).f_trace = True
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record_line()
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record_line()
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expected_lines = [1, 4, 5]
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lines = []
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test(False)
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self.assertEqual(lines, expected_lines)
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lines = []
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test(True)
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self.assertEqual(lines, expected_lines)
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@support.cpython_only
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def test_clear_refcycles(self):
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# .clear() doesn't leave any refcycle behind
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with support.disable_gc():
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class C:
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pass
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c = C()
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wr = weakref.ref(c)
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exc = self.outer(c=c)
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del c
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self.assertIsNot(None, wr())
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self.clear_traceback_frames(exc.__traceback__)
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self.assertIs(None, wr())
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class FrameAttrsTest(unittest.TestCase):
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def make_frames(self):
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def outer():
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x = 5
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y = 6
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def inner():
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z = x + 2
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1/0
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t = 9
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return inner()
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try:
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outer()
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except ZeroDivisionError as e:
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tb = e.__traceback__
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frames = []
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while tb:
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frames.append(tb.tb_frame)
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tb = tb.tb_next
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return frames
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def test_clear_locals(self):
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# Test f_locals after clear() (issue #21897)
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f, outer, inner = self.make_frames()
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outer.clear()
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inner.clear()
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self.assertEqual(outer.f_locals, {})
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self.assertEqual(inner.f_locals, {})
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def test_locals_clear_locals(self):
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# Test f_locals before and after clear() (to exercise caching)
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f, outer, inner = self.make_frames()
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self.assertNotEqual(outer.f_locals, {})
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self.assertNotEqual(inner.f_locals, {})
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outer.clear()
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inner.clear()
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self.assertEqual(outer.f_locals, {})
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self.assertEqual(inner.f_locals, {})
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def test_f_lineno_del_segfault(self):
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f, _, _ = self.make_frames()
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with self.assertRaises(AttributeError):
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del f.f_lineno
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class ReprTest(unittest.TestCase):
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"""
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Tests for repr(frame).
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"""
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def test_repr(self):
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def outer():
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x = 5
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y = 6
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def inner():
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z = x + 2
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1/0
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t = 9
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return inner()
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offset = outer.__code__.co_firstlineno
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try:
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outer()
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except ZeroDivisionError as e:
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tb = e.__traceback__
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frames = []
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while tb:
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frames.append(tb.tb_frame)
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tb = tb.tb_next
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else:
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self.fail("should have raised")
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f_this, f_outer, f_inner = frames
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file_repr = re.escape(repr(__file__))
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self.assertRegex(repr(f_this),
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r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code test_repr>$"
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% (file_repr, offset + 23))
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self.assertRegex(repr(f_outer),
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r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code outer>$"
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% (file_repr, offset + 7))
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self.assertRegex(repr(f_inner),
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r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code inner>$"
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% (file_repr, offset + 5))
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class TestFrameLocals(unittest.TestCase):
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def test_scope(self):
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class A:
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x = 1
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sys._getframe().f_locals['x'] = 2
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sys._getframe().f_locals['y'] = 2
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self.assertEqual(A.x, 2)
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self.assertEqual(A.y, 2)
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def f():
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x = 1
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sys._getframe().f_locals['x'] = 2
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sys._getframe().f_locals['y'] = 2
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self.assertEqual(x, 2)
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self.assertEqual(locals()['y'], 2)
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f()
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def test_closure(self):
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x = 1
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y = 2
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def f():
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z = x + y
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d = sys._getframe().f_locals
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self.assertEqual(d['x'], 1)
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self.assertEqual(d['y'], 2)
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d['x'] = 2
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d['y'] = 3
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f()
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self.assertEqual(x, 2)
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self.assertEqual(y, 3)
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def test_as_dict(self):
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x = 1
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y = 2
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d = sys._getframe().f_locals
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# self, x, y, d
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self.assertEqual(len(d), 4)
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self.assertIs(d['d'], d)
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self.assertEqual(set(d.keys()), set(['x', 'y', 'd', 'self']))
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self.assertEqual(len(d.values()), 4)
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self.assertIn(1, d.values())
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self.assertEqual(len(d.items()), 4)
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self.assertIn(('x', 1), d.items())
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self.assertEqual(d.__getitem__('x'), 1)
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d.__setitem__('x', 2)
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self.assertEqual(d['x'], 2)
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self.assertEqual(d.get('x'), 2)
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self.assertIs(d.get('non_exist', None), None)
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self.assertEqual(d.__len__(), 4)
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self.assertEqual(set([key for key in d]), set(['x', 'y', 'd', 'self']))
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self.assertIn('x', d)
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self.assertTrue(d.__contains__('x'))
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self.assertEqual(reversed(d), list(reversed(d.keys())))
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d.update({'x': 3, 'z': 4})
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self.assertEqual(d['x'], 3)
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self.assertEqual(d['z'], 4)
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with self.assertRaises(TypeError):
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d.update([1, 2])
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self.assertEqual(d.setdefault('x', 5), 3)
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self.assertEqual(d.setdefault('new', 5), 5)
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self.assertEqual(d['new'], 5)
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with self.assertRaises(KeyError):
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d['non_exist']
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def test_as_number(self):
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x = 1
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y = 2
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d = sys._getframe().f_locals
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self.assertIn('z', d | {'z': 3})
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d |= {'z': 3}
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self.assertEqual(d['z'], 3)
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d |= {'y': 3}
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self.assertEqual(d['y'], 3)
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with self.assertRaises(TypeError):
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d |= 3
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with self.assertRaises(TypeError):
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_ = d | [3]
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def test_non_string_key(self):
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d = sys._getframe().f_locals
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d[1] = 2
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self.assertEqual(d[1], 2)
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def test_write_with_hidden(self):
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def f():
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f_locals = [sys._getframe().f_locals for b in [0]][0]
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f_locals['b'] = 2
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f_locals['c'] = 3
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self.assertEqual(b, 2)
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self.assertEqual(c, 3)
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b = 0
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c = 0
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f()
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def test_local_objects(self):
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o = object()
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k = '.'.join(['a', 'b', 'c'])
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f_locals = sys._getframe().f_locals
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f_locals['o'] = f_locals['k']
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self.assertEqual(o, 'a.b.c')
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def test_copy(self):
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x = 0
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d = sys._getframe().f_locals
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d_copy = d.copy()
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self.assertIsInstance(d_copy, dict)
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self.assertEqual(d_copy['x'], 0)
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d_copy['x'] = 1
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self.assertEqual(x, 0)
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def test_update_with_self(self):
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def f():
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f_locals = sys._getframe().f_locals
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f_locals.update(f_locals)
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f_locals.update(f_locals)
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f_locals.update(f_locals)
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f()
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def test_repr(self):
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x = 1
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# Introduce a reference cycle
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frame = sys._getframe()
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self.assertEqual(repr(frame.f_locals), repr(dict(frame.f_locals)))
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def test_delete(self):
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x = 1
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d = sys._getframe().f_locals
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with self.assertRaises(TypeError):
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del d['x']
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with self.assertRaises(AttributeError):
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d.clear()
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with self.assertRaises(AttributeError):
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d.pop('x')
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@support.cpython_only
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def test_sizeof(self):
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proxy = sys._getframe().f_locals
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support.check_sizeof(self, proxy, support.calcobjsize("P"))
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def test_unsupport(self):
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x = 1
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d = sys._getframe().f_locals
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with self.assertRaises(TypeError):
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copy.copy(d)
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with self.assertRaises(TypeError):
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copy.deepcopy(d)
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def test_is_mapping(self):
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x = 1
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d = sys._getframe().f_locals
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self.assertIsInstance(d, Mapping)
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match d:
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case {"x": value}:
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self.assertEqual(value, 1)
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kind = "mapping"
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case _:
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kind = "other"
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self.assertEqual(kind, "mapping")
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def _x_stringlikes(self):
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class StringSubclass(str):
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pass
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class ImpostorX:
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def __hash__(self):
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return hash('x')
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def __eq__(self, other):
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return other == 'x'
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return StringSubclass('x'), ImpostorX(), 'x'
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def test_proxy_key_stringlikes_overwrite(self):
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def f(obj):
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x = 1
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proxy = sys._getframe().f_locals
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proxy[obj] = 2
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return (
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list(proxy.keys()),
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dict(proxy),
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proxy
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)
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for obj in self._x_stringlikes():
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with self.subTest(cls=type(obj).__name__):
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keys_snapshot, proxy_snapshot, proxy = f(obj)
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expected_keys = ['obj', 'x', 'proxy']
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expected_dict = {'obj': 'x', 'x': 2, 'proxy': proxy}
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self.assertEqual(proxy.keys(), expected_keys)
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self.assertEqual(proxy, expected_dict)
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self.assertEqual(keys_snapshot, expected_keys)
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self.assertEqual(proxy_snapshot, expected_dict)
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def test_proxy_key_stringlikes_ftrst_write(self):
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def f(obj):
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proxy = sys._getframe().f_locals
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proxy[obj] = 2
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self.assertEqual(x, 2)
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x = 1
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|
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for obj in self._x_stringlikes():
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with self.subTest(cls=type(obj).__name__):
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f(obj)
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|
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def test_proxy_key_unhashables(self):
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class StringSubclass(str):
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__hash__ = None
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|
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class ObjectSubclass:
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__hash__ = None
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|
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proxy = sys._getframe().f_locals
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|
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for obj in StringSubclass('x'), ObjectSubclass():
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with self.subTest(cls=type(obj).__name__):
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with self.assertRaises(TypeError):
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proxy[obj]
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with self.assertRaises(TypeError):
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proxy[obj] = 0
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|
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def test_constructor(self):
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FrameLocalsProxy = type([sys._getframe().f_locals
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for x in range(1)][0])
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self.assertEqual(FrameLocalsProxy.__name__, 'FrameLocalsProxy')
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|
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def make_frame():
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x = 1
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y = 2
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return sys._getframe()
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|
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proxy = FrameLocalsProxy(make_frame())
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self.assertEqual(proxy, {'x': 1, 'y': 2})
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|
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# constructor expects 1 frame argument
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with self.assertRaises(TypeError):
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FrameLocalsProxy() # no arguments
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with self.assertRaises(TypeError):
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FrameLocalsProxy(123) # wrong type
|
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with self.assertRaises(TypeError):
|
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FrameLocalsProxy(frame=sys._getframe()) # no keyword arguments
|
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|
|
|
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class FrameLocalsProxyMappingTests(mapping_tests.TestHashMappingProtocol):
|
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"""Test that FrameLocalsProxy behaves like a Mapping (with exceptions)"""
|
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|
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def _f(*args, **kwargs):
|
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def _f():
|
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return sys._getframe().f_locals
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return _f()
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type2test = _f
|
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|
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@unittest.skipIf(True, 'Locals proxies for different frames never compare as equal')
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def test_constructor(self):
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pass
|
|
|
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@unittest.skipIf(True, 'Unlike a mapping: del proxy[key] fails')
|
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def test_write(self):
|
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pass
|
|
|
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@unittest.skipIf(True, 'Unlike a mapping: no proxy.popitem')
|
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def test_popitem(self):
|
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pass
|
|
|
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@unittest.skipIf(True, 'Unlike a mapping: no proxy.pop')
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def test_pop(self):
|
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pass
|
|
|
|
@unittest.skipIf(True, 'Unlike a mapping: no proxy.clear')
|
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def test_clear(self):
|
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pass
|
|
|
|
@unittest.skipIf(True, 'Unlike a mapping: no proxy.fromkeys')
|
|
def test_fromkeys(self):
|
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pass
|
|
|
|
# no del
|
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def test_getitem(self):
|
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mapping_tests.BasicTestMappingProtocol.test_getitem(self)
|
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d = self._full_mapping({'a': 1, 'b': 2})
|
|
self.assertEqual(d['a'], 1)
|
|
self.assertEqual(d['b'], 2)
|
|
d['c'] = 3
|
|
d['a'] = 4
|
|
self.assertEqual(d['c'], 3)
|
|
self.assertEqual(d['a'], 4)
|
|
|
|
@unittest.skipIf(True, 'Unlike a mapping: no proxy.update')
|
|
def test_update(self):
|
|
pass
|
|
|
|
# proxy.copy returns a regular dict
|
|
def test_copy(self):
|
|
d = self._full_mapping({1:1, 2:2, 3:3})
|
|
self.assertEqual(d.copy(), {1:1, 2:2, 3:3})
|
|
d = self._empty_mapping()
|
|
self.assertEqual(d.copy(), d)
|
|
self.assertRaises(TypeError, d.copy, None)
|
|
|
|
self.assertIsInstance(d.copy(), dict)
|
|
|
|
@unittest.skipIf(True, 'Locals proxies for different frames never compare as equal')
|
|
def test_eq(self):
|
|
pass
|
|
|
|
|
|
class TestFrameCApi(unittest.TestCase):
|
|
def test_basic(self):
|
|
x = 1
|
|
ctypes = import_helper.import_module('ctypes')
|
|
PyEval_GetFrameLocals = ctypes.pythonapi.PyEval_GetFrameLocals
|
|
PyEval_GetFrameLocals.restype = ctypes.py_object
|
|
frame_locals = PyEval_GetFrameLocals()
|
|
self.assertTrue(type(frame_locals), dict)
|
|
self.assertEqual(frame_locals['x'], 1)
|
|
frame_locals['x'] = 2
|
|
self.assertEqual(x, 1)
|
|
|
|
PyEval_GetFrameGlobals = ctypes.pythonapi.PyEval_GetFrameGlobals
|
|
PyEval_GetFrameGlobals.restype = ctypes.py_object
|
|
frame_globals = PyEval_GetFrameGlobals()
|
|
self.assertTrue(type(frame_globals), dict)
|
|
self.assertIs(frame_globals, globals())
|
|
|
|
PyEval_GetFrameBuiltins = ctypes.pythonapi.PyEval_GetFrameBuiltins
|
|
PyEval_GetFrameBuiltins.restype = ctypes.py_object
|
|
frame_builtins = PyEval_GetFrameBuiltins()
|
|
self.assertEqual(frame_builtins, __builtins__)
|
|
|
|
PyFrame_GetLocals = ctypes.pythonapi.PyFrame_GetLocals
|
|
PyFrame_GetLocals.argtypes = [ctypes.py_object]
|
|
PyFrame_GetLocals.restype = ctypes.py_object
|
|
frame = sys._getframe()
|
|
f_locals = PyFrame_GetLocals(frame)
|
|
self.assertTrue(f_locals['x'], 1)
|
|
f_locals['x'] = 2
|
|
self.assertEqual(x, 2)
|
|
|
|
|
|
class TestIncompleteFrameAreInvisible(unittest.TestCase):
|
|
|
|
def test_issue95818(self):
|
|
# See GH-95818 for details
|
|
code = textwrap.dedent(f"""
|
|
import gc
|
|
|
|
gc.set_threshold(1,1,1)
|
|
class GCHello:
|
|
def __del__(self):
|
|
print("Destroyed from gc")
|
|
|
|
def gen():
|
|
yield
|
|
|
|
fd = open({__file__!r})
|
|
l = [fd, GCHello()]
|
|
l.append(l)
|
|
del fd
|
|
del l
|
|
gen()
|
|
""")
|
|
assert_python_ok("-c", code)
|
|
|
|
@support.cpython_only
|
|
@threading_helper.requires_working_threading()
|
|
def test_sneaky_frame_object_teardown(self):
|
|
|
|
class SneakyDel:
|
|
def __del__(self):
|
|
"""
|
|
Stash a reference to the entire stack for walking later.
|
|
|
|
It may look crazy, but you'd be surprised how common this is
|
|
when using a test runner (like pytest). The typical recipe is:
|
|
ResourceWarning + -Werror + a custom sys.unraisablehook.
|
|
"""
|
|
nonlocal sneaky_frame_object
|
|
sneaky_frame_object = sys._getframe()
|
|
|
|
class SneakyThread(threading.Thread):
|
|
"""
|
|
A separate thread isn't needed to make this code crash, but it does
|
|
make crashes more consistent, since it means sneaky_frame_object is
|
|
backed by freed memory after the thread completes!
|
|
"""
|
|
|
|
def run(self):
|
|
"""Run SneakyDel.__del__ as this frame is popped."""
|
|
ref = SneakyDel()
|
|
|
|
sneaky_frame_object = None
|
|
t = SneakyThread()
|
|
t.start()
|
|
t.join()
|
|
# sneaky_frame_object can be anything, really, but it's crucial that
|
|
# SneakyThread.run's frame isn't anywhere on the stack while it's being
|
|
# torn down:
|
|
self.assertIsNotNone(sneaky_frame_object)
|
|
while sneaky_frame_object is not None:
|
|
self.assertIsNot(
|
|
sneaky_frame_object.f_code, SneakyThread.run.__code__
|
|
)
|
|
sneaky_frame_object = sneaky_frame_object.f_back
|
|
|
|
def test_entry_frames_are_invisible_during_teardown(self):
|
|
class C:
|
|
"""A weakref'able class."""
|
|
|
|
def f():
|
|
"""Try to find globals and locals as this frame is being cleared."""
|
|
ref = C()
|
|
# Ignore the fact that exec(C()) is a nonsense callback. We're only
|
|
# using exec here because it tries to access the current frame's
|
|
# globals and locals. If it's trying to get those from a shim frame,
|
|
# we'll crash before raising:
|
|
return weakref.ref(ref, exec)
|
|
|
|
with support.catch_unraisable_exception() as catcher:
|
|
# Call from C, so there is a shim frame directly above f:
|
|
weak = operator.call(f) # BOOM!
|
|
# Cool, we didn't crash. Check that the callback actually happened:
|
|
self.assertIs(catcher.unraisable.exc_type, TypeError)
|
|
self.assertIsNone(weak())
|
|
|
|
@unittest.skipIf(_testcapi is None, 'need _testcapi')
|
|
class TestCAPI(unittest.TestCase):
|
|
def getframe(self):
|
|
return sys._getframe()
|
|
|
|
def test_frame_getters(self):
|
|
frame = self.getframe()
|
|
self.assertEqual(frame.f_locals, _testcapi.frame_getlocals(frame))
|
|
self.assertIs(frame.f_globals, _testcapi.frame_getglobals(frame))
|
|
self.assertIs(frame.f_builtins, _testcapi.frame_getbuiltins(frame))
|
|
self.assertEqual(frame.f_lasti, _testcapi.frame_getlasti(frame))
|
|
|
|
def test_getvar(self):
|
|
current_frame = sys._getframe()
|
|
x = 1
|
|
self.assertEqual(_testcapi.frame_getvar(current_frame, "x"), 1)
|
|
self.assertEqual(_testcapi.frame_getvarstring(current_frame, b"x"), 1)
|
|
with self.assertRaises(NameError):
|
|
_testcapi.frame_getvar(current_frame, "y")
|
|
with self.assertRaises(NameError):
|
|
_testcapi.frame_getvarstring(current_frame, b"y")
|
|
|
|
# wrong name type
|
|
with self.assertRaises(TypeError):
|
|
_testcapi.frame_getvar(current_frame, b'x')
|
|
with self.assertRaises(TypeError):
|
|
_testcapi.frame_getvar(current_frame, 123)
|
|
|
|
def getgenframe(self):
|
|
yield sys._getframe()
|
|
|
|
def test_frame_get_generator(self):
|
|
gen = self.getgenframe()
|
|
frame = next(gen)
|
|
self.assertIs(gen, _testcapi.frame_getgenerator(frame))
|
|
|
|
def test_frame_fback_api(self):
|
|
"""Test that accessing `f_back` does not cause a segmentation fault on
|
|
a frame created with `PyFrame_New` (GH-99110)."""
|
|
def dummy():
|
|
pass
|
|
|
|
frame = _testcapi.frame_new(dummy.__code__, globals(), locals())
|
|
# The following line should not cause a segmentation fault.
|
|
self.assertIsNone(frame.f_back)
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|