8000 PDB stops on wrong line inside pattern matching block · Issue #99474 · python/cpython · GitHub
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EliseevEgor opened this issue Nov 14, 2022 · 5 comments
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PDB stops on wrong line inside pattern matching block #99474

EliseevEgor opened this issue Nov 14, 2022 · 5 comments
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@brandtbucher
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3.11 only security fixes interpreter-core (Objects, Python, Grammar, and Parser dirs) triaged The issue has been accepted as valid by a triager. type-bug An unexpected behavior, bug, or error

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@EliseevEgor
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Bug report

If you try to debug code example with pdb and step forward 9 times then pdb stops on 12 line (but it shouldn't go to if statement).
It happens because function trace_dispatch(self, frame, event, arg) gets line event.

Code example (main.py):

def example(i):
    match i % 4:
        case 0:
            if i > 10:
                return 0
        case 1:
            if i > 10:
                return 1
        case 2:
            if i > 10:
                print(f'{i}, {i > 10}')
                return 2
        case 3:
            if i > 10:
                return 3


if __name__ == '__main__':
    print(example(2))

Steps:

python3 -m pdb main.py
> main.py(1)<module>()
-> def example(i):
(Pdb) s
> main.py(18)<module>()
-> if __name__ == '__main__':
(Pdb) s
> main.py(19)<module>()
-> print(example(2))
(Pdb) s
--Call--
> main.py(1)example()
-> def example(i):
(Pdb) s
> main.py(2)example()
-> match i % 4:
(Pdb) s
> main.py(3)example()
-> case 0:
(Pdb) s
> main.py(6)example()
-> case 1:
(Pdb) s
> main.py(9)example()
-> case 2:
(Pdb) s
> main.py(10)example()
-> if i > 10:
(Pdb) s
> main.py(12)example()
-> return 2
...

Environment

Python versions: 3.10, 3.11
OS: MacOS Monterey
CPU: Intel Core i9 2.3 GHz
@EliseevEgor EliseevEgor added the type-bug An unexpected behavior, bug, or error label Nov 14, 2022
@corona10
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cc @brandtbucher

@brandtbucher
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Thanks, I'll take a look. Could be that jump out of the end of the case block is incorrectly inheriting the location from the last compiled statement.

@brandtbucher brandtbucher self-assigned this Nov 17, 2022
@artemmukhin
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The issue seems to be fixed at least since 3.12.0a6

(Pdb) s
> main.py(9)example()
-> case 2:
(Pdb) s
> main.py(10)example()
-> if i > 10:
(Pdb) s
--Return--
> main.py(10)example()->None
-> if i > 10:
(Pdb) s
None
--Return--
> main.py(19)<module>()->None
-> print(example(2))

@brandtbucher
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I think this might be the same issue as #103971.

CC @gaogaotiantian

@brandtbucher brandtbucher added interpreter-core (Objects, Python, Grammar, and Parser dirs) 3.11 only security fixes triaged The issue has been accepted as valid by a triager. labels Apr 28, 2023
@brandtbucher
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Confirmed duplicate.

@brandtbucher brandtbucher closed this as not planned Won't fix, can't repro, duplicate, stale Apr 28, 2023
@brandtbucher brandtbucher mentioned this issue May 31, 2023
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3.11 only security fixes interpreter-core (Objects, Python, Grammar, and Parser dirs) triaged The issue has been accepted as valid by a triager. type-bug An unexpected behavior, bug, or error
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@artemmukhin @corona10 @brandtbucher @EliseevEgor
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