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Commit8bb6596

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Suppress uninitialized variable warnings for small stack allocations
Add macros to disable and re-enable compiler-specific warnings aboutpossibly uninitialized variables (`-Wmaybe-uninitialized` for GCC,`-Wuninitialized` for Clang, and warning C4700 for MSVC). Use thesemacros in `_PyEvalFramePushAndInit_Ex()` to suppress false positiveson stack-allocated arrays like `stack_array`.This also addresses warnings such as the one in `pycore_call.h` whenusing `small_stack[_PY_FASTCALL_SMALL_STACK]` that may be flagged byGCC's `-Wmaybe-uninitialized`.
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‎Include/pymacro.h

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@@ -199,4 +199,21 @@ PyAPI_FUNC(uint32_t) Py_PACK_VERSION(int x, int y);
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#endif// Py_LIMITED_API < 3.14
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#if defined(__clang__)
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#defineDISABLE_UNINIT_WARNINGS_Pragma("clang diagnostic push") \
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_Pragma("clang diagnostic ignored\"-Wuninitialized\"")
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#define ENABLE_UNINIT_WARNINGS_Pragma("clang diagnostic pop")
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#elif defined(__GNUC__) || defined(__GNUG__)
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#defineDISABLE_UNINIT_WARNINGS_Pragma("GCC diagnostic push") \
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_Pragma("GCC diagnostic ignored\"-Wmaybe-uninitialized\"")
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#define ENABLE_UNINIT_WARNINGS_Pragma("GCC diagnostic pop")
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#elif defined(_MSC_VER)
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#defineDISABLE_UNINIT_WARNINGS__pragma(warning(push)) \
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__pragma(warning(disable:4700))
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#define ENABLE_UNINIT_WARNINGS__pragma(warning(pop))
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#else
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#defineDISABLE_UNINIT_WARNINGS
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#defineENABLE_UNINIT_WARNINGS
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#endif
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#endif/* Py_PYMACRO_H*/

‎Python/ceval.c

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@@ -1814,6 +1814,7 @@ _PyEvalFramePushAndInit_Ex(PyThreadState *tstate, _PyStackRef func,
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PyObject*kwnames=NULL;
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_PyStackRef*newargs;
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PyObject*const*object_array=NULL;
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DISABLE_UNINIT_WARNINGS
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_PyStackRefstack_array[8];
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if (has_dict) {
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object_array=_PyStack_UnpackDict(tstate,_PyTuple_ITEMS(callargs),nargs,kwargs,&kwnames);
@@ -1855,6 +1856,7 @@ _PyEvalFramePushAndInit_Ex(PyThreadState *tstate, _PyStackRef func,
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elseif (nargs>8) {
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PyMem_Free((void*)newargs);
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}
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ENABLE_UNINIT_WARNINGS
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/* No need to decref func here because the reference has been stolen by
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_PyEvalFramePushAndInit.
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*/

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