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 чт, 10 февр. 2022 г. в 23:07, Armin Rigo <armin.r...@gmail.com>: > Hi, > > On Thu, 10 Feb 2022 at 14:03, Dmitry Kovner <dmit...@lightrun.com> wrote: > > Hello! I'm trying to build a low-level C API extension of cPython to be > used in PyPy. The extension extensively uses some fields of PyCodeObject ( > https://github.com/python/cpython/blob/f87e616af038ee8963185e11b96841c81e8ef15a/Include/code.h#L23): > co_firstlineno, co_stacksize, co_consts and so on. However, it seems these > fields are not defined in the similar structure of the PyPy > implementation: > https://foss.heptapod.net/pypy/pypy/-/blob/branch/py3.8/pypy/module/cpyext/include/code.h#L7. > Is it possible to get values of these fields using PyPy C API somehow? > > Yes, it's a limitation of PyPy not to expose these fields. If you > want to write portable code that always works, the simplest is to call > `PyObject_GetAttrString(code, "__consts__")` etc. Remember that you > need to call `Py_DECREF()` on the result at some point. > > > A bientôt, > > Armin. >
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