Allow to show specialized bytecode via `dis` CLI

[picnixz]

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

Linked PRs

• gh-127413: allow to show specialized bytecode via dis CLI #127414

[JelleZijlstra]

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.

[picnixz]

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.

[picnixz]

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