STINNER Victor <vstin...@python.org> added the comment:

> In case of malloc, every memory allocating code need to use 
> malloc/calloc/realloc. This is official and the only way to allocate a 
> memory. But we do not guarantee that Python core uses only public C API like 
> PyErr_Occurred(). It can use more low-level and efficient but less safer C 
> API internally. It can replace the function with a macro which access 
> internal structures directly (for compiling the core only). And this is 
> actually the case. Overridding the public C API functions not always has an 
> effect on the core.

To confirm what you said: if we take the specific example of PyErr_Occurred(), 
I recently added a new _PyErr_Occurred() function which is declared as a static 
inline function. _PyErr_Occurred() cannot be overriden.

static inline PyObject* _PyErr_Occurred(PyThreadState *tstate)
{
    assert(tstate != NULL);
    return tstate->curexc_type;
}

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38980>
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