On 15/2/22 05:15, Dmitry Kovner wrote:
Hi, again! First of all, thanks for the fast reply! The answer helped
me a lot. However, during the porting of the extension to the awesome
PyPy, I've got more questions:
1. The extension uses opcodes from cPython's opcode.h header file.
(https://github.com/python/cpython/blob/8a84aef0123bd8c13cf81fbc3b5f6d45f96c2656/Include/opcode.h)
There is no such file in the implementation of C API in PyPy. What
could you recommend as the best alternative?
2. The extension uses some fields of PyThreadState structure. For
example, its frame field
(https://github.com/python/cpython/blob/8a84aef0123bd8c13cf81fbc3b5f6d45f96c2656/Include/cpython/pystate.h#L59).
Is it right to use PyObject_GetAttrString() to access that field in
PyPy C API?
3. There is no function PyFrame_FastToLocals
(https://github.com/python/cpython/blob/8a84aef0123bd8c13cf81fbc3b5f6d45f96c2656/Objects/frameobject.c#L931)
in the C API of PyPy. Are there any alternatives?
4. Functions PyEval_SetTrace(), PyEval_SetProfile(),
PyFrame_GetLineNumber() are defined only in stubs.py in PyPy.
(https://foss.heptapod.net/pypy/pypy/-/blob/branch/py3.7/pypy/module/cpyext/stubs.py#L918)
Is there a way to get that information in PyPy except patching of its
source code?
5. Are there any analogues of all PyTrace_* constants
(https://github.com/python/cpython/blob/8a84aef0123bd8c13cf81fbc3b5f6d45f96c2656/Include/cpython/pystate.h#L26)
in the PyPy C API?
6. There is no function PyFrame_Check()
(https://github.com/python/cpython/blob/8a84aef0123bd8c13cf81fbc3b5f6d45f96c2656/Include/frameobject.h#L53)
in the PyPy C API. Are there any alternatives?
I'm really sorry for the long question! I hope the list of the
problems described above is full enough to port the extension and I
will have no more questions. :)
Best regards, Dmitrii
Even if PyPy could expose the interfaces you desire (and it would be a
lot of work to do that), you would lose out on speed since the C-API on
PyPy is much much slower than pure python. If you really want to port
your extension, you might want to rethink what it is doing and refactor
it to do so in a PyPy-friendly way: pure python + CFFI where needed to
interface to libraries that expose C interfaces. The C-API is a layer we
bolted on top of PyPy to support popular libraries like Cython and
NumPy, it is not meant for projects that probe CPython internals.
Matti
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