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bpo-34989: python-gdb.py: fix current_line_num()#9889

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vstinner merged 2 commits intopython:masterfrom
vstinner:fakerepr
Oct 15, 2018
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bpo-34989: python-gdb.py: fix current_line_num()#9889
vstinner merged 2 commits intopython:masterfrom
vstinner:fakerepr

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@vstinner vstinner commented Oct 15, 2018 •
edited by bedevere-bot
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python-gdb.py now handles errors on computing the line number
of a Python frame.

Changes:

  • PyFrameObjectPtr.current_line_num() now catchs any Exception on
    calling addr2line(), instead of failing with a surprising "<class
    'TypeError'> 'FakeRepr' object is not subscriptable" error.
  • All callers of current_line_num() now handle current_line_num()
    returning None.
  • PyFrameObjectPtr.current_line() now also catchs IndexError on
    getting a line from the Python source file.

https://bugs.python.org/issue34989

@vstinner
bpo-34989: python-gdb.py: fix current_line_num()
a74366a 
python-gdb.py now handles errors on computing the line number
of a Python frame.

Changes:

* PyFrameObjectPtr.current_line_num() now catchs any Exception on
  calling addr2line(), instead of failing with a surprising "<class
  'TypeError'> 'FakeRepr' object is not subscriptable" error.
* All callers of current_line_num() now handle current_line_num()
  returning None.
* PyFrameObjectPtr.current_line() now also catchs IndexError on
  getting a line from the Python source file.
@vstinner vstinner requested review from ambv and gpshead October 15, 2018 11:23
ambv
ambv approved these changes Oct 15, 2018
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This is great and fixes a problem I've seen in the past. I left a nit and two questions for your consideration, Victor.

Tools/gdb/libpython.py

lineno = self.current_line_num()
if lineno is None:
return '(failed to get frame line number)'
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@ambv ambv Oct 15, 2018

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tiny nit: that could also have a blank line after to make it obvious you're returning early.

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I concur, done.

Tools/gdb/libpython.py
with open(os_fsencode(filename), 'r') as fp:
lines = fp.readlines()
except IOError:
return None
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@ambv ambv Oct 15, 2018

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Could we maybe return '(failed to read source)' instead of "None" here? That would maybe be more descriptive, what do you think?

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This code mimicks linecache.getline() which is used to render a traceback.

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To be honest, I was also surprised at the first read, and I had to double check when I saw your comment :-D

Tools/gdb/libpython.py
# Convert from 1-based current_line_num to 0-based list offset
return lines[lineno - 1]
except IndexError:
return None
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Same here. If we have an index error that means the file did not match. Maybe we should say this to the user?

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Ditto, linecache.getline() behaves the same, and the code mimicks linecache's behaviour.

@vstinner vstinner merged commit 2e438cc into python:master Oct 15, 2018
@vstinner vstinner deleted the fakerepr branch October 15, 2018 21:20
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miss-islington commented Oct 15, 2018

Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Oct 15, 2018
@vstinner @miss-islington
bpo-34989: python-gdb.py: fix current_line_num() (pythonGH-9889)
360ca2b 
python-gdb.py now handles errors on computing the line number
of a Python frame.

Changes:

* PyFrameObjectPtr.current_line_num() now catchs any Exception on
  calling addr2line(), instead of failing with a surprising "<class
  'TypeError'> 'FakeRepr' object is not subscriptable" error.
* All callers of current_line_num() now handle current_line_num()
  returning None.
* PyFrameObjectPtr.current_line() now also catchs IndexError on
  getting a line from the Python source file.
(cherry picked from commit 2e438cc)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
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bedevere-bot commented Oct 15, 2018

GH-9897 is a backport of this pull request to the 3.7 branch.

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miss-islington commented Oct 15, 2018

Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.6.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Oct 15, 2018
@vstinner @miss-islington
bpo-34989: python-gdb.py: fix current_line_num() (pythonGH-9889)
8195c00 
python-gdb.py now handles errors on computing the line number
of a Python frame.

Changes:

* PyFrameObjectPtr.current_line_num() now catchs any Exception on
  calling addr2line(), instead of failing with a surprising "<class
  'TypeError'> 'FakeRepr' object is not subscriptable" error.
* All callers of current_line_num() now handle current_line_num()
  returning None.
* PyFrameObjectPtr.current_line() now also catchs IndexError on
  getting a line from the Python source file.
(cherry picked from commit 2e438cc)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
@bedevere-bot
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bedevere-bot commented Oct 15, 2018

GH-9898 is a backport of this pull request to the 3.6 branch.

miss-islington added a commit that referenced this pull request Oct 15, 2018
@miss-islington @vstinner
bpo-34989: python-gdb.py: fix current_line_num() (GH-9889)
fcea3dd 
python-gdb.py now handles errors on computing the line number
of a Python frame.

Changes:

* PyFrameObjectPtr.current_line_num() now catchs any Exception on
  calling addr2line(), instead of failing with a surprising "<class
  'TypeError'> 'FakeRepr' object is not subscriptable" error.
* All callers of current_line_num() now handle current_line_num()
  returning None.
* PyFrameObjectPtr.current_line() now also catchs IndexError on
  getting a line from the Python source file.
(cherry picked from commit 2e438cc)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
miss-islington added a commit that referenced this pull request Oct 15, 2018
@miss-islington @vstinner
bpo-34989: python-gdb.py: fix current_line_num() (GH-9889)
71e601e 
python-gdb.py now handles errors on computing the line number
of a Python frame.

Changes:

* PyFrameObjectPtr.current_line_num() now catchs any Exception on
  calling addr2line(), instead of failing with a surprising "<class
  'TypeError'> 'FakeRepr' object is not subscriptable" error.
* All callers of current_line_num() now handle current_line_num()
  returning None.
* PyFrameObjectPtr.current_line() now also catchs IndexError on
  getting a line from the Python source file.
(cherry picked from commit 2e438cc)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
vstinner added a commit that referenced this pull request Oct 15, 2018
@vstinner
bpo-34989: python-gdb.py: fix current_line_num() (GH-9889) (GH-9899)
aadb44e 
python-gdb.py now handles errors on computing the line number
of a Python frame.

Changes:

* PyFrameObjectPtr.current_line_num() now catchs any Exception on
  calling addr2line(), instead of failing with a surprising "<class
  'TypeError'> 'FakeRepr' object is not subscriptable" error.
* All callers of current_line_num() now handle current_line_num()
  returning None.
* PyFrameObjectPtr.current_line() now also catchs IndexError on
  getting a line from the Python source file.

(cherry picked from commit 2e438cc)
@vstinner
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vstinner commented Oct 16, 2018

Thanks Łukasz Langa @ambv fo the review!

vstinner added a commit that referenced this pull request Oct 16, 2018
@vstinner
Revert "bpo-34989: python-gdb.py: fix current_line_num() (GH-9889)"
5b41ae0 
This reverts commit 2e438cc.
CuriousLearner added a commit to CuriousLearner/cpython that referenced this pull request Oct 18, 2018
@CuriousLearner
Merge branch 'master' into fix-issue8525
c0917e3 
* master: (621 commits)
  Update opcode.h header comment to mention the source data file (pythonGH-9935)
  bpo-34936: Fix TclError in tkinter.Spinbox.selection_element(). (pythonGH-9760)
  Updated documentation on logging.debug(). (pythonGH-9946)
  bpo-34765: Update the install-sh file (pythonGH-9592)
  bpo-35008: Fix possible leaks in Element.__setstate__(). (pythonGH-9924)
  bpo-35011: Restore use of pyexpatns.h in libexpat (pythonGH-9939)
  bpo-24658: Fix read/write greater than 2 GiB on macOS (pythonGH-1705)
  Add missing comma to wsgiref doc (pythonGH-9932)
  bpo-23420: Verify the value of '-s' when execute the CLI of cProfile (pythonGH-9925)
  Doc: Fix is_prime (pythonGH-9909)
  In email docs, correct spelling of foregoing (python#9856)
  In email.parser in message_from_bytes, update `strict` to `policy` (python#9854)
  bpo-34997: Fix test_logging.ConfigDictTest.test_out_of_order (pythonGH-9913)
  Added CLI starter example to logging cookbook. (pythonGH-9910)
  bpo-34783: Fix test_nonexisting_script() (pythonGH-9896)
  bpo-23554: Change echo server example class name from EchoServerClientProtocol to EchoServerProtocol (pythonGH-9859)
  bpo-34989: python-gdb.py: fix current_line_num() (pythonGH-9889)
  Stop using deprecated logging API in Sphinx suspicious checker (pythonGH-9875)
  fix dangling keyfunc examples in documentation of heapq and sorted (python#1432)
  bpo-34844: logging.Formatter enhancement - Ensure style and format string matches in logging.Formatter  (pythonGH-9703)
  ...
CuriousLearner added a commit to CuriousLearner/cpython that referenced this pull request Oct 18, 2018
@CuriousLearner
Merge branch 'master' into fix-issue15045
9f75617 
* master: (1787 commits)
  Update opcode.h header comment to mention the source data file (pythonGH-9935)
  bpo-34936: Fix TclError in tkinter.Spinbox.selection_element(). (pythonGH-9760)
  Updated documentation on logging.debug(). (pythonGH-9946)
  bpo-34765: Update the install-sh file (pythonGH-9592)
  bpo-35008: Fix possible leaks in Element.__setstate__(). (pythonGH-9924)
  bpo-35011: Restore use of pyexpatns.h in libexpat (pythonGH-9939)
  bpo-24658: Fix read/write greater than 2 GiB on macOS (pythonGH-1705)
  Add missing comma to wsgiref doc (pythonGH-9932)
  bpo-23420: Verify the value of '-s' when execute the CLI of cProfile (pythonGH-9925)
  Doc: Fix is_prime (pythonGH-9909)
  In email docs, correct spelling of foregoing (python#9856)
  In email.parser in message_from_bytes, update `strict` to `policy` (python#9854)
  bpo-34997: Fix test_logging.ConfigDictTest.test_out_of_order (pythonGH-9913)
  Added CLI starter example to logging cookbook. (pythonGH-9910)
  bpo-34783: Fix test_nonexisting_script() (pythonGH-9896)
  bpo-23554: Change echo server example class name from EchoServerClientProtocol to EchoServerProtocol (pythonGH-9859)
  bpo-34989: python-gdb.py: fix current_line_num() (pythonGH-9889)
  Stop using deprecated logging API in Sphinx suspicious checker (pythonGH-9875)
  fix dangling keyfunc examples in documentation of heapq and sorted (python#1432)
  bpo-34844: logging.Formatter enhancement - Ensure style and format string matches in logging.Formatter  (pythonGH-9703)
  ...
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@ambv ambv ambv approved these changes

@gpshead gpshead Awaiting requested review from gpshead

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