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Allow to show specialized bytecode via dis CLI #127413

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Allow to show specialized bytecode via dis CLI#127413
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picnixz
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stdlibStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancement

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@picnixz
picnixz
opened on Nov 29, 2024

Feature or enhancement

Proposal:

It's already possible to show specialized bytecode using dis.dis(code, adaptive=True) but it's not possible to do it from the CLI. I think we can add a flag -S that does it (most of the other flags are exposed to the CLI).

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

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  1. picnixz
    added
    type-featureA feature request or enhancement
    stdlibStandard Library Python modules in the Lib/ directory
    on Nov 29, 2024
  2. picnixz
    self-assigned this
    on Nov 29, 2024

  3. JelleZijlstra commented on Nov 29, 2024

    @JelleZijlstra
    JelleZijlstra
    on Nov 29, 2024
    Member

    Doesn't bytecode only get specialized after it is run? The CLI will show bytecode for code that's never run, so it will never be specialized.

  4. picnixz commented on Nov 29, 2024

    @picnixz
    picnixz
    on Nov 29, 2024
    MemberAuthor

    The CLI will show bytecode for code that's never run, so it will never be specialized.

    Actually, dis.dis(adaptive=True) does show specialized bytecode. Or maybe I'm not using the correct terminology? For instance, a simple x = None shows a LOAD_CONST and not a LOAD_CONST_IMMORTAL, which is what I found weird.

  5. picnixz commented on Nov 30, 2024

    @picnixz
    picnixz
    on Nov 30, 2024
    MemberAuthor

    An example:

    Non-specialized bytecode

    echo 'x = None' | ./python -m dis
  0           RESUME                   0

  1           LOAD_CONST               0 (None)
              STORE_NAME               0 (x)
              LOAD_CONST               0 (None)
              RETURN_VALUE

    Specialized bytecode

    echo 'x = None' | ./python -m dis -S
  0           RESUME                   0

  1           LOAD_CONST_IMMORTAL      0 (None)
              STORE_NAME               0 (x)
              LOAD_CONST_IMMORTAL      0 (None)
              RETURN_VALUE
  6. iritkatriel
    added a commit that references this issue on Dec 5, 2024

    gh-127413: allow to show specialized bytecode via `dis` CLI (#127414)

    67b9a53
  7. picnixz
    closed this as completedon Dec 5, 2024
  8. srinivasreddy
    added a commit that references this issue on Jan 8, 2025

    pythongh-127413: allow to show specialized bytecode via `dis` CLI (py…

    ead403b
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