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Add PyCode_GetCode() function #34

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Merged
merged 2 commits into from
May 3, 2022
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Add PyCode_GetCode() function #34

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Add PyCode_GetCode() function
vstinner May 3, 2022
98cde84
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vstinner May 3, 2022
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@vstinner
vstinner committed May 3, 2022
commit 98cde8470a82e1e176f3b80bd043fe9efd05611c
3 changes: 2 additions & 1 deletion pythoncapi_compat.h
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Original file line number Diff line number Diff line change
Expand Up @@ -185,7 +185,7 @@ _PyFrame_GetCodeBorrow(PyFrameObject *frame)
}


// bpo-40421 added PyFrame_GetCode() to Python 3.9.0b1
// bpo-40421 added PyFrame_GetBack() to Python 3.9.0b1
#if PY_VERSION_HEX < 0x030900B1 && !defined(PYPY_VERSION)
PYCAPI_COMPAT_STATIC_INLINE(PyFrameObject*)
PyFrame_GetBack(PyFrameObject *frame)
Expand Down Expand Up @@ -487,6 +487,7 @@ PyFloat_Unpack8(const char *p, int le)
#endif


// gh-92154 added PyCode_GetCode() to Python 3.11.0b1
#if PY_VERSION_HEX < 0x030B00B1 && !defined(PYPY_VERSION)
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Not sure if it matters, but this code will fail on one version: 3.11a7. In that version, co_code was removed, but there is no PyCode_GetCode.

I don't know what you should do here. Maybe exclude that version?

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Perhaps #error with an explanatory message.

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I don't know what you should do here. Maybe exclude that version?

Alpha versions of Python 3.11 are not supported:

pythoncapi-compat/tests/test_pythoncapi_compat.py

Lines 152 to 157 in c9764f5

# Implementing PyFrame_GetLocals() and PyCode_GetCode() require the
# internal C API in Python 3.11 alpha versions
if 0x30b0000 <= sys.hexversion < 0x30b00b1:
version = sys.version.split()[0]
print("SKIP TESTS: Python %s is not supported" % version)
return

It's a deliberate choice to not pollute pythoncapi_compat.h with ugly code to tons of compatibility layers, whereas there are few users of Python alpha versions.

Perhaps #error with an explanatory message.

What I suggested to users who want to upgrade pythoncapi_compat.h before Python 3.11 beta1 is to copy the file and then remove the functions which cause compilation errors. It's being discussed at: #32

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Ok, makes sense.

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I'm not against adding an #error if you consider that it will help users impacted by this issue.

Python 3.11 beta1 is scheduled in a few days.

Python 3.11 breaks tons of C API: https://docs.python.org/dev/whatsnew/3.11.html#c-api-changes

In the past, I tried first to add getter functions in one Python version, and only change the structure in the following Python version. Well, the optimization work broke many structures (PyThreadState, PyFrameObject, PyCodeObject). But after beta1, the API should be stable.

PyObject *PyCode_GetCode(PyCodeObject *code)
{
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6 changes: 3 additions & 3 deletions tests/test_pythoncapi_compat.py
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Expand Up @@ -149,9 +149,9 @@ def main():
global VERBOSE
VERBOSE = ("-v" in sys.argv[1:] or "--verbose" in sys.argv[1:])

# Implementing PyFrame_GetLocals() requires the internal C API in Python
# 3.11 alpha versions
if 0x30b0000 <= sys.hexversion < 0x30b00a7:
# Implementing PyFrame_GetLocals() and PyCode_GetCode() require the
# internal C API in Python 3.11 alpha versions
if 0x30b0000 <= sys.hexversion < 0x30b00b1:
version = sys.version.split()[0]
print("SKIP TESTS: Python %s is not supported" % version)
return
Expand Down