78 lines
3.0 KiB
Diff
78 lines
3.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Miro=20Hron=C4=8Dok?= <miro@hroncok.cz>
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Date: Fri, 8 Jul 2022 12:19:43 +0200
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Subject: [PATCH] 00385: gh-94675: Add a regression test for rjsmin re slowdown
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This tests a speed regression in the re module
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which prevented chromium from building in Fedora.
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https://github.com/python/cpython/pull/94685
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---
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Lib/test/test_re.py | 31 ++++++++++++++++++-
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...2-07-08-12-22-00.gh-issue-94675.IiTs5f.rst | 1 +
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2 files changed, 31 insertions(+), 1 deletion(-)
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create mode 100644 Misc/NEWS.d/next/Tests/2022-07-08-12-22-00.gh-issue-94675.IiTs5f.rst
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diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
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index ab980793fa..5d946370ee 100644
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--- a/Lib/test/test_re.py
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+++ b/Lib/test/test_re.py
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@@ -1,6 +1,7 @@
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from test.support import (gc_collect, bigmemtest, _2G,
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cpython_only, captured_stdout,
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- check_disallow_instantiation, is_emscripten, is_wasi)
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+ check_disallow_instantiation, is_emscripten, is_wasi,
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+ SHORT_TIMEOUT)
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import locale
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import re
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import string
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@@ -11,6 +12,14 @@
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from re import Scanner
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from weakref import proxy
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+# some platforms lack working multiprocessing
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+try:
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+ import _multiprocessing
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+except ImportError:
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+ multiprocessing = None
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+else:
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+ import multiprocessing
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+
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# Misc tests from Tim Peters' re.doc
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# WARNING: Don't change details in these tests if you don't know
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@@ -2438,6 +2447,26 @@ def test_template_function_and_flag_is_deprecated(self):
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self.assertTrue(template_re1.match('ahoy'))
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self.assertFalse(template_re1.match('nope'))
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+ @unittest.skipIf(multiprocessing is None, 'test requires multiprocessing')
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+ def test_regression_gh94675(self):
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+ pattern = re.compile(r'(?<=[({}])(((//[^\n]*)?[\n])([\000-\040])*)*'
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+ r'((/[^/\[\n]*(([^\n]|(\[\n]*(]*)*\]))'
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+ r'[^/\[]*)*/))((((//[^\n]*)?[\n])'
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+ r'([\000-\040]|(/\*[^*]*\*+'
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+ r'([^/*]\*+)*/))*)+(?=[^\000-\040);\]}]))')
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+ input_js = '''a(function() {
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+ ///////////////////////////////////////////////////////////////////
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+ });'''
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+ p = multiprocessing.Process(target=pattern.sub, args=('', input_js))
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+ p.start()
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+ p.join(SHORT_TIMEOUT)
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+ try:
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+ self.assertFalse(p.is_alive(), 'pattern.sub() timed out')
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+ finally:
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+ if p.is_alive():
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+ p.terminate()
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+ p.join()
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+
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def get_debug_out(pat):
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with captured_stdout() as out:
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diff --git a/Misc/NEWS.d/next/Tests/2022-07-08-12-22-00.gh-issue-94675.IiTs5f.rst b/Misc/NEWS.d/next/Tests/2022-07-08-12-22-00.gh-issue-94675.IiTs5f.rst
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new file mode 100644
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index 0000000000..d0005d9f60
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Tests/2022-07-08-12-22-00.gh-issue-94675.IiTs5f.rst
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@@ -0,0 +1 @@
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+Add a regression test for :mod:`re` exponentional slowdown when using rjsmin.
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