如何在Cython中使用覆盖率分析 [英] How to use coverage analysis with Cython

问题描述

我正在尝试使用 pytest-cov 和Coveralls.io对某些Cython代码进行覆盖率分析。我已经尽可能构建了启用了跟踪的扩展模块，并借助以下链接运行了分析：

在上面的示例中， get_cost 方法似乎可以，但是上述属性的 __ set __ 方法是

更新：似乎问题出在Cython类上。如果该类是用 def 而不是 cdef 定义的，那么问题就解决了。我猜还没有对此的完全支持。

解决方案

如果Cython跟踪工具似乎无法正常工作，应该可以使用 gcov 对cython代码进行覆盖率分析。这样可以验证是否执行了生成的C代码的某些行。

使用简单的 main.pyx

  import mymod 
 
 def main（）：
 mymod.test（）
  

和 mymod.pyx

  def test（）：
返回42 
  

  cython --embed main.pyx 
 cython mymod.pyx 
 
 gcc -O1 -fPIC -fprofile-arcs -ftest-coverage -Wall -I / usr / include / python2.7 -c -o main.o main.c 
 gcc main.o -fprofile-arcs -lpython2.7 -lgcov -o main 
 gcc -O1 -fPIC -fprofile-arcs -ftest-coverage -Wall -I / usr / include / python2.7 -c -o mymod.o mymod.c 
 gcc -shared mymod .o -fprofile-arcs -lgcov -lpython2.7 -o mymod.so 
  

创建了一个可执行文件。执行 ./ main 后，为 gcov 创建了 main.gcda 和 mymod.gcda

I'm trying to run coverage analysis on some Cython code using pytest-cov and coveralls.io. I've got as far as building the extension modules with tracing enabled, and running the analysis with the help of the links below:

http://docs.cython.org/src/tutorial/profiling_tutorial.html

http://blog.behnel.de/posts/coverage-analysis-for-cython-modules.html

However, I'm getting some results that I can't explain. It seems that many of the def/cdef/cpdef lines in the code are showing as not running, despite code within them being OK. The results aren't even consistent as some lines seem OK.

Example report: https://coveralls.io/files/1871744040

I don't know if I'm calling something wrong, if this is a bug, or if I'm just not interpreting the results correctly.

In the example above, the get_cost method seems OK, but the __set__ method for the property above is not called, despite the lines within the function having been called.

Update: It seems the issue is with Cython classes. If the class is defined with def rather than cdef the problem goes away. I guess there isn't full support for this yet.

解决方案

If the Cython tracing facility does not seem to work as intended, it should be possible to use gcov for the coverage analysis of cython code. This way one could verify if some line of the generated C code is executed or not.

With a simple main.pyx

import mymod

def main():
    mymod.test()

and mymod.pyx

def test():
    return 42

and then

cython --embed main.pyx
cython mymod.pyx

gcc -O1 -fPIC -fprofile-arcs -ftest-coverage -Wall -I/usr/include/python2.7 -c -o main.o main.c
gcc main.o -fprofile-arcs -lpython2.7 -lgcov -o main
gcc -O1 -fPIC -fprofile-arcs -ftest-coverage -Wall -I/usr/include/python2.7 -c -o mymod.o mymod.c
gcc -shared mymod.o -fprofile-arcs -lgcov -lpython2.7 -o mymod.so

an executable was created. After executing ./main main.gcda and mymod.gcda were created for gcov.

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