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228 lines
6.2 KiB
228 lines
6.2 KiB
2 years ago
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import re
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import sys
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import types
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import unittest
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import weakref
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from test import support
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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_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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# Clearing the frame closes the generator
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gen.gi_frame.clear()
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self.assertTrue(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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# Clearing the frame closes the generator
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f.clear()
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self.assertTrue(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_locals(self):
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f, outer, inner = self.make_frames()
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outer_locals = outer.f_locals
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self.assertIsInstance(outer_locals.pop('inner'), types.FunctionType)
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self.assertEqual(outer_locals, {'x': 5, 'y': 6})
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inner_locals = inner.f_locals
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self.assertEqual(inner_locals, {'x': 5, 'z': 7})
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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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outer.f_locals
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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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if __name__ == "__main__":
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unittest.main()
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