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Commit6bd9689

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gh-60115: Support frozen modules for linecache.getline() (#131638)
1 parent06822bf commit6bd9689

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5 files changed

+48
-2
lines changed

5 files changed

+48
-2
lines changed

‎Doc/library/linecache.rst‎

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@@ -30,6 +30,10 @@ The :mod:`linecache` module defines the following functions:
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..index::triple: module; search; path
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If *filename* indicates a frozen module (starting with ``'<frozen '``), the function
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will attepmt to get the real file name from ``module_globals['__file__']`` if
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*module_globals* is not ``None``.
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If a file named *filename* is not found, the function first checks
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for a:pep:`302` ``__loader__`` in *module_globals*.
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If there is such a loader and it defines a ``get_source`` method,
@@ -38,6 +42,10 @@ The :mod:`linecache` module defines the following functions:
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Finally, if *filename* is a relative filename,
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it is looked up relative to the entries in the module search path, ``sys.path``.
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..versionchanged::3.14
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Support *filename* of frozen modules.
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..function::clearcache()
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‎Doc/whatsnew/3.14.rst‎

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@@ -706,6 +706,13 @@ json
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(Contributed by Trey Hunner in:gh:`122873`.)
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linecache
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---------
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*:func:`linecache.getline` can retrieve source code for frozen modules.
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(Contributed by Tian Gao in:gh:`131638`.)
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mimetypes
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---------
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‎Lib/linecache.py‎

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@@ -63,6 +63,16 @@ def _getlines_from_code(code):
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return []
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def_source_unavailable(filename):
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"""Return True if the source code is unavailable for such file name."""
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return (
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notfilename
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or (filename.startswith('<')
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andfilename.endswith('>')
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andnotfilename.startswith('<frozen '))
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)
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defcheckcache(filename=None):
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"""Discard cache entries that are out of date.
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(This is not checked upon each call!)"""
@@ -118,10 +128,17 @@ def updatecache(filename, module_globals=None):
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iffilenameincache:
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iflen(cache[filename])!=1:
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cache.pop(filename,None)
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ifnotfilenameor(filename.startswith('<')andfilename.endswith('>')):
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if_source_unavailable(filename):
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return []
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fullname=filename
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iffilename.startswith('<frozen ')andmodule_globalsisnotNone:
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# This is a frozen module, so we need to use the filename
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# from the module globals.
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fullname=module_globals.get('__file__')
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iffullnameisNone:
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return []
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else:
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fullname=filename
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try:
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stat=os.stat(fullname)
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exceptOSError:

‎Lib/test/test_linecache.py‎

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@@ -281,6 +281,19 @@ def test_loader(self):
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self.assertEqual(linecache.getlines(filename,module_globals),
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['source for x.y.z\n'])
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deftest_frozen(self):
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filename='<frozen fakemodule>'
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module_globals= {'__file__':FILENAME}
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empty=linecache.getlines(filename)
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self.assertEqual(empty, [])
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lines=linecache.getlines(filename,module_globals)
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self.assertGreater(len(lines),0)
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lines_cached=linecache.getlines(filename)
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self.assertEqual(lines,lines_cached)
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linecache.clearcache()
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empty=linecache.getlines(filename)
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self.assertEqual(empty, [])
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deftest_invalid_names(self):
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forname,descin [
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('\x00','NUL bytes filename'),
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@@ -0,0 +1 @@
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Support frozen modules for:func:`linecache.getline`.

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