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import gc import operator import re import sys import textwrap import threading import types import unittest import weakref try: import _testcapi except ImportError: _testcapi = None from test import support from test.support import threading_helper from test.support.script_helper import assert_python_ok class ClearTest(unittest.TestCase): """ Tests for frame.clear(). """ def inner(self, x=5, **kwargs): 1/0 def outer(self, **kwargs): try: self.inner(**kwargs) except ZeroDivisionError as e: exc = e return exc def clear_traceback_frames(self, tb): """ Clear all frames in a traceback. """ while tb is not None: tb.tb_frame.clear() tb = tb.tb_next def test_clear_locals(self): class C: pass c = C() wr = weakref.ref(c) exc = self.outer(c=c) del c support.gc_collect() # A reference to c is held through the frames self.assertIsNot(None, wr()) self.clear_traceback_frames(exc.__traceback__) support.gc_collect() # The reference was released by .clear() self.assertIs(None, wr()) def test_clear_does_not_clear_specials(self): class C: pass c = C() exc = self.outer(c=c) del c f = exc.__traceback__.tb_frame f.clear() self.assertIsNot(f.f_code, None) self.assertIsNot(f.f_locals, None) self.assertIsNot(f.f_builtins, None) self.assertIsNot(f.f_globals, None) def test_clear_generator(self): endly = False def g(): nonlocal endly try: yield self.inner() finally: endly = True gen = g() next(gen) self.assertFalse(endly) # Clearing the frame closes the generator gen.gi_frame.clear() self.assertTrue(endly) def test_clear_executing(self): # Attempting to clear an executing frame is forbidden. try: 1/0 except ZeroDivisionError as e: f = e.__traceback__.tb_frame with self.assertRaises(RuntimeError): f.clear() with self.assertRaises(RuntimeError): f.f_back.clear() def test_clear_executing_generator(self): # Attempting to clear an executing generator frame is forbidden. endly = False def g(): nonlocal endly try: 1/0 except ZeroDivisionError as e: f = e.__traceback__.tb_frame with self.assertRaises(RuntimeError): f.clear() with self.assertRaises(RuntimeError): f.f_back.clear() yield f finally: endly = True gen = g() f = next(gen) self.assertFalse(endly) # Clearing the frame closes the generator f.clear() self.assertTrue(endly) def test_lineno_with_tracing(self): def record_line(): f = sys._getframe(1) lines.append(f.f_lineno-f.f_code.co_firstlineno) def test(trace): record_line() if trace: sys._getframe(0).f_trace = True record_line() record_line() expected_lines = [1, 4, 5] lines = [] test(False) self.assertEqual(lines, expected_lines) lines = [] test(True) self.assertEqual(lines, expected_lines) @support.cpython_only def test_clear_refcycles(self): # .clear() doesn't leave any refcycle behind with support.disable_gc(): class C: pass c = C() wr = weakref.ref(c) exc = self.outer(c=c) del c self.assertIsNot(None, wr()) self.clear_traceback_frames(exc.__traceback__) self.assertIs(None, wr()) class FrameAttrsTest(unittest.TestCase): def make_frames(self): def outer(): x = 5 y = 6 def inner(): z = x + 2 1/0 t = 9 return inner() try: outer() except ZeroDivisionError as e: tb = e.__traceback__ frames = [] while tb: frames.append(tb.tb_frame) tb = tb.tb_next return frames def test_locals(self): f, outer, inner = self.make_frames() outer_locals = outer.f_locals self.assertIsInstance(outer_locals.pop('inner'), types.FunctionType) self.assertEqual(outer_locals, {'x': 5, 'y': 6}) inner_locals = inner.f_locals self.assertEqual(inner_locals, {'x': 5, 'z': 7}) def test_clear_locals(self): # Test f_locals after clear() (issue #21897) f, outer, inner = self.make_frames() outer.clear() inner.clear() self.assertEqual(outer.f_locals, {}) self.assertEqual(inner.f_locals, {}) def test_locals_clear_locals(self): # Test f_locals before and after clear() (to exercise caching) f, outer, inner = self.make_frames() outer.f_locals inner.f_locals outer.clear() inner.clear() self.assertEqual(outer.f_locals, {}) self.assertEqual(inner.f_locals, {}) def test_f_lineno_del_segfault(self): f, _, _ = self.make_frames() with self.assertRaises(AttributeError): del f.f_lineno class ReprTest(unittest.TestCase): """ Tests for repr(frame). """ def test_repr(self): def outer(): x = 5 y = 6 def inner(): z = x + 2 1/0 t = 9 return inner() offset = outer.__code__.co_firstlineno try: outer() except ZeroDivisionError as e: tb = e.__traceback__ frames = [] while tb: frames.append(tb.tb_frame) tb = tb.tb_next else: self.fail("should have raised") f_this, f_outer, f_inner = frames file_repr = re.escape(repr(__file__)) self.assertRegex(repr(f_this), r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code test_repr>$" % (file_repr, offset + 23)) self.assertRegex(repr(f_outer), r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code outer>$" % (file_repr, offset + 7)) self.assertRegex(repr(f_inner), r"^<frame at 0x[0-9a-fA-F]+, file %s, line %d, code inner>$" % (file_repr, offset + 5)) 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 def test_sneaky_frame_object(self): def trace(frame, event, arg): """ Don't actually do anything, just force a frame object to be created. """ def callback(phase, info): """ Yo dawg, I heard you like frames, so I'm allocating a frame while you're allocating a frame, so you can have a frame while you have a frame! """ nonlocal sneaky_frame_object sneaky_frame_object = sys._getframe().f_back.f_back # We're done here: gc.callbacks.remove(callback) def f(): while True: yield old_threshold = gc.get_threshold() old_callbacks = gc.callbacks[:] old_enabled = gc.isenabled() old_trace = sys.gettrace() try: # Stop the GC for a second while we set things up: gc.disable() # Create a paused generator: g = f() next(g) # Move all objects to the oldest generation, and tell the GC to run # on the *very next* allocation: gc.collect() gc.set_threshold(1, 0, 0) # Okay, so here's the nightmare scenario: # - We're tracing the resumption of a generator, which creates a new # frame object. # - The allocation of this frame object triggers a collection # *before* the frame object is actually created. # - During the collection, we request the exact same frame object. # This test does it with a GC callback, but in real code it would # likely be a trace function, weakref callback, or finalizer. # - The collection finishes, and the original frame object is # created. We now have two frame objects fighting over ownership # of the same interpreter frame! sys.settrace(trace) gc.callbacks.append(callback) sneaky_frame_object = None gc.enable() next(g) # g.gi_frame should be the frame object from the callback (the # one that was *requested* second, but *created* first): self.assertIs(g.gi_frame, sneaky_frame_object) finally: gc.set_threshold(*old_threshold) gc.callbacks[:] = old_callbacks sys.settrace(old_trace) if old_enabled: gc.enable() @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()