gh-132775: Add _PyCode_VerifyStateless() #133221
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iritkatriel
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Apr 30, 2025
Include/internal/pycore_code.h
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| /* "Stateless" code is a function or code object which does not rely on | ||
| * external state or internal state. It may rely on arguments and | ||
| * builtins, but not globals or a closure. Thus it does not need to |
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| * builtins, but not globals or a closure. Thus it does not need to | |
| * builtins, but not globals or a closure. Thus it does not |
Include/internal/pycore_code.h
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| * Stateless code that takes no arguments and doesn't return anything | ||
| * may be treated like a script. | ||
| * | ||
| * Note that we can consider stateless code to be |
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| * Note that we can consider stateless code to be | |
| * We consider stateless code to be |
Objects/codeobject.c
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| } | ||
| // We may consider relaxing these if it becomes a problem. | ||
| errmsg = _PyCode_CheckNoInternalState(co); | ||
| if (errmsg != NULL) { |
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The convention is NULL means error and non-null is not error. I don't think it's a good idea to do the opposite here.
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The function cannot fail, but I see what you are saying. I'll change this.
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| if (errmsg != NULL) { | ||
| if (p_errmsg != NULL) { |
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If p_errmsg can be NULL, then the cases above need a check too, right?
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"Stateless" code is a function or code object which does not rely on external state or internal state. It may rely on arguments and
builtins, but not globals or a closure. I've left a comment in pycore_code.h that provides more detail.
We also add
_PyFunction_VerifyStateless(). The new functions will be used in several later changes that facilitate "sharing" functions and code objects between interpreters.