Python XDECREF在64位mingw上失败 [英] Python XDECREF failing on 64bit mingw

问题描述

我正在使用以下代码从C调用python方法:

I am calling a python method from C using the following code:

#include "Python.h"

char *find_site(void)
{
    char *app_site_dir = 0;
    PyObject *module = 0;
    PyObject *result = 0;
    PyObject *module_dict = 0;
    PyObject *func = 0;

    module = PyImport_ImportModule((char *)"Site"); /* new ref */
    if (module == 0)
    {
    PyErr_Print();
    printf("Couldn't find python module Site\n");
    goto out;
    }
    printf("module = %p\n", module);
    module_dict = PyModule_GetDict(module); /* borrowed */
    if (module_dict == 0)
    {
    PyErr_Print();
    printf("Couldn't find read python module Site\n");
    goto out;
    }
    func = PyDict_GetItemString(module_dict, "find_site"); /* borrowed */
    if (func == 0)
    {
    PyErr_Print();
    printf("Couldn't find Site.find_site\n");
    goto out;
    }
    result = PyEval_CallObject(func, NULL); /* new ref */
    if (result == 0)
    {
    PyErr_Print();
    printf("Couldn't run Site.find_site\n");
    goto out;
    }
    else if (result == Py_None)
    {
    printf("Couldn't find site\n");
    goto out;
    }
    printf("result = %p\n", result);
    app_site_dir = PyString_AsString(result); /* borrowed */
    if (app_site_dir == 0)
    {
    PyErr_Print();
    printf("Couldn't read result from Site.find_site\n");
    goto out;
    }
    app_site_dir = strdup(app_site_dir); /* keep in our own memory */
    if (*app_site_dir)
    {
    printf("Found Site at %s\n", app_site_dir);
    }
    else
    printf("Could not find Site\n");
out:;
    printf("result = %p decref\n", result);
    Py_XDECREF(result);
    printf("module = %p module\n", module);
    Py_XDECREF(module);

    return app_site_dir;
}

int main(int argc, char **argv)
{
    Py_Initialize();
    char *site = find_site();
    printf("Site = %s\n", site);
    free(site);
}

python代码是

import os

def find_site():
    return os.path.abspath(".")

(在完整的应用程序中，这比较复杂，但是这个简化的示例演示了该问题)

(in the full application, this is more complex, but this cut-down example demonstrates the problem)

这是在Linux上与mxe.cc交叉编译的，如下所示: i686-w64-mingw32.static-c++ -I/usr/local/opt/mxe.master/usr/x86_64-w64-mingw32.static/include/python2.7 -o py32.exe py.cc -lpython27

this is cross compiled on linux with mxe.cc like this: i686-w64-mingw32.static-c++ -I/usr/local/opt/mxe.master/usr/x86_64-w64-mingw32.static/include/python2.7 -o py32.exe py.cc -lpython27

并且它可以在Windows上按预期运行(从此处的Ubuntu shell)

and it runs on Windows as expected (from the Ubuntu shell here)

module = 028BC710
result = 0283D6B0
Found Site at \\wsl$\Ubuntu\home\dl
result = 0283D6B0 decref
module = 028BC710 decref
Site = \\wsl$\Ubuntu\home\dl

但是为64位编译时 x86_64-w64-mingw32.static-c++ -I/usr/local/opt/mxe.master/usr/x86_64-w64-mingw32.static/include/python2.7 -o py64.exe py.cc -lpython27

but when compiled for 64-bit x86_64-w64-mingw32.static-c++ -I/usr/local/opt/mxe.master/usr/x86_64-w64-mingw32.static/include/python2.7 -o py64.exe py.cc -lpython27

它无法运行:

module = 0000000002750408
result = 0000000000E62EF0
Found Site at \\wsl$\Ubuntu\home\dl
result = 0000000000E62EF0 decref

Python调用成功，返回并打印了该值，但result的XDECREF失败，程序被炸毁，没有其他输出.

the Python call is successful, the value is returned and printed, but the XDECREF of result fails and the program bombs out with no other output.

在这两种情况下，libpython都是使用从目标Windows计算机复制的.dll以及pexports和dlltool来创建.a的:例如

In both cases the libpython was made using the .dll copied from the target Windows machine and pexports and dlltool to create the .a: e.g

pexports-0.47/pexports python27.dll > python27.def
i686-w64-mingw32.static-dlltool  --dllname python27.dll --def python27.def --output-lib libpython2.7.a

我的问题可能在哪里?

推荐答案

找到并修复，pyconfig.h对于mingw 64位使用不正确，对于Py_ssize_t具有不正确的sizeof.

found and fixed, pyconfig.h was incorrect for mingw 64 bit use and had wrong sizeof for Py_ssize_t.

请参见 https://bugs.python.org/issue39001

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