Implement calling into C #3

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1. certik commented on Dec 29, 2021

   

   certik

   on Dec 29, 2021

   Last edited by certik

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   One idea:

   from ctypes import c_float, c_double
   def c_sin_f32(x: c_float) -> c_float:
       pass
   
   def c_sin_f64(x: c_double) -> c_double:
       pass
2. certik commented on Dec 30, 2021

   

   certik

   on Dec 30, 2021

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   CPython does not have 32bit floats, so we simply declare in math.py:

   def sin(x: f64) -> f64:
       return c_sin_f64(x)

   👍React with 👍1Reacted by Thirumalai Shaktivel
3. certik commented on Feb 24, 2022

   

   certik

   on Feb 24, 2022

   Last edited by certik

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   I like this approach: https://code.activestate.com/recipes/576731-c-function-decorator/, that might be almost exactly what we need. An example how to use ctypes with types is, e.g., here: https://www.linkedin.com/pulse/calling-c-from-python-using-ctypes-warren-jitsing
4. certik commented on Feb 26, 2022

   

   certik

   on Feb 26, 2022

   Last edited by certik

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   Initial implementation was done in #167, #171, #172. Here is a test:

   • https://github.com/lcompilers/lpython/blob/4cb87bed52eb54685ba38baef307d0d0520a8beb/integration_tests/test_c_interop_01.py

   It works with CPython. Now we need to get this test working with LPython.
5. certik commented on Mar 2, 2022

   

   certik

   on Mar 2, 2022

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   The LPython part was implemented in: #179, #181 and used in #184, #186. This issue is fixed. We need to extend this C interop to other types, but that will be an ongoing work as we need it.
6. certik

   closed this as completedon Mar 2, 2022