Question

我正在将CPython移植到Emscripten，并且它已成功构建。但是，当我尝试通过Node.js运行python.asm.js时，Py_InitializeEx(0)调用中出现了一个非常奇怪的错误：

Traceback (most recent call last):
  File "/lib/python2.7/site.py", line 62, in <module>
    import os
  File "/lib/python2.7/os.py", line 44, in <module>
    from posix import *
TypeError: 'NotImplementedType' object does not support indexing

错误是从PySequence_GetItem中的Objects/abstract.c生成的，但我不明白执行是如何实现的。如果我在导致错误的行之前import posix，import posix语句成功完成，我可以在posix模块中调用函数。因此，错误与from <module> import *行有关。 PySequence_GetItem如何与from <module> import *语句相关，以及错误原因可能是什么？

如果您想重现此问题，我released the code on GitHub

Answer 1

在调查出现问题的同时，我关闭了优化（编译并与-O0链接）。生成的JS可执行文件也失败了，但出现了不同的错误：

Invalid function pointer '495' called with signature 'iii'. Perhaps this is
an invalid value (e.g. caused by calling a virtual method on a NULL pointer)?
Or calling a function with an incorrect type, which will fail? (it is worth
building your source files with -Werror (warnings are errors), as warnings can
indicate undefined behavior which can cause this)
This pointer might make sense in another type signature:
  ii: _dict_keys  iiii: 0  i: undefined  iiiii: 0  viii: 0  vii: 0  vi: 0  v: 0
495
495

我查看了Emscripten的settings.js以了解与函数指针相关的选项，并找到了解决问题的EMULATE_FUNCTION_POINTER_CASTS。

Emscripten交叉编译CPython中的奇怪导入错误

1 个答案: