[Python-Dev] Rename Include/internals/ to Include/pycore/

Eric Snow ericsnowcurrently at gmail.com
Tue Nov 6 13:13:19 EST 2018

On Fri, Nov 2, 2018 at 1:02 PM Victor Stinner <vstinner at redhat.com> wrote:
> Le ven. 2 nov. 2018 à 18:32, Neil Schemenauer <nas-python at arctrix.com> a écrit :
> > A simple approach would be to introduce something like
> > Python-internal.h.  If you are a Python internal unit, you can
> > include both Python.h and Python-internal.h.  We could, over time,
> > split Python-iternal.h into smaller modular includes.
> Since this discussion, I already moved most Py_BUILD_CORE in
> Include/internal/. I added a lot of #include "pycore_xxx.h" in C
> files.
> I started to reach the limit with this PR which adds the
> pycore_object.h include to not less than 33 C files:
> https://github.com/python/cpython/pull/10272
> I rewrote this PR to avoid the need to modify 33 C files:
> https://github.com/python/cpython/pull/10276/files
> I added the following code to Python.h:
> #ifdef Py_BUILD_CORE
> /* bpo-35081: Automatically include pycore_object.h in Python.h, to avoid
> to have to add an explicit #include "pycore_object.h" to each C file. */
> # include "pycore_object.h"
> #endif
> I'm not sure of it's a temporary workaround or not :-) Maybe a
> Python-internal.h would be a better solution? We can identify the most
> common header files needed to access "Python internals" and put them
> in this "common" header file.
> For example, most C files using Python internals have to access
> _PyRuntime global variable (55 C files), so "pycore_state.h" is a good
> candidate.

FWIW, I'm still in favor of keeping the includes specific.  For me
personally it helps to narrow down dependencies, making the source
easier to follow.

> By the way, I don't understand the rationale to have _PyRuntime in
> pycore_state.h. IMHO pycore_state.h should only contain functions to
> get the Python thread and Python interpreter states. IMHO _PyRuntime
> is unrelated and should belong to a different header file, maybe
> pycore_runtime.h? I didn't do this change yet *because* I would have
> to modify the 55 files currently including it.

The runtime state isn't all that different from the thread state or
the interpreter state.  It's simply broader in scope, much like the
interpreter state is broader in scope than the thread state.  That's
why I put it where I did.


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