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GeezerVison is showing github.com — compiler's line number propagation algorithm could be more robust · Issue #103795 · python/cpython

compiler's line number propagation algorithm could be more robust #103795

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compiler's line number propagation algorithm could be more robust#103795
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interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

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@iritkatriel
iritkatriel
opened on Apr 24, 2023
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The bug in #101517 was due to a raise instruction not being assigned a line number. This happened because the compiler's line number propagation algorithm cannot propagate line numbers to blocks that have two predecessors. The fix for that case was to reorganise the instructions so that this situation is avoided.

We should

  1. Be able to detect when this happens (via assertions in the compiler).
  2. Make the line number propagation algorithm more robust so that this doesn't happen.

See also #103550 (review).

CC @carljm

Reacted by Carl Meyer and sunmy2019

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  1. iritkatriel
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)
    on Apr 24, 2023
  2. iritkatriel
    closed this as completedon Sep 17, 2025
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