gh-132737: Support profiling modules that import __main___

[aneeshdurg]

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[StanFromIreland]

Suggested change

	Support profiling modules that import __main___, such as modules that use to pickle. The github issue has an example repro that throws an exception without this change, and succeeds with it.
	Support profiling modules that import ``__main__``, such as modules that use to pickle. The github issue has an example repro that throws an exception without this change, and succeeds with it.

[StanFromIreland]

Suggested change

	Support profiling modules that import __main___, such as modules that use to pickle. The github issue has an example repro that throws an exception without this change, and succeeds with it.
	Support profiling modules that import __main___, such as modules that use to pickle.

NEWS does not need this

[gaogaotiantian]

This is not going to work because you introduced extra function calls in cProfile record, which would confuse people. Try a simple print("hello world") and see the difference between the old implementation and the new one.

I can work on this (kind of the responsible person for the module), or if you really want to take a swing at the issue I can give you some direction.

[aneeshdurg]

I'd be happy to take a swing at it! Any pointers on what to look into?

[gaogaotiantian]

So pdb has a very similar problem to solve and it works on your script. The code you run has to be the compiled code from the file (io.open_code actually also sends an audit event which probably matters), not anything else. You should do something like pdb - just update __main__ to make sure your program can import from it. I don't think you need to build a new module.

Also, you need a regression test in this case. You need to write a test that fails with the original implementation, and passes after. Hopefully it won't be this complicated (I know it's not long, but I don't believe dataclass or even pickle is required to reproduce this issue). It's okay to use pickle if that's the easiest way.