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gh-61103: Support double complex (_Complex) type in ctypes (#120894)

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Example:

```pycon
>>> import ctypes
>>> ctypes.__STDC_IEC_559_COMPLEX__
1
>>> libm = ctypes.CDLL('libm.so.6')
>>> libm.clog.argtypes = [ctypes.c_double_complex]
>>> libm.clog.restype = ctypes.c_double_complex
>>> libm.clog(1+1j)
(0.34657359027997264+0.7853981633974483j)
```

Co-authored-by: Nice Zombies <nineteendo19d0@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
This commit is contained in:
Sergey B Kirpichev 2024-07-01 11:54:33 +03:00 • committed by GitHub
parent a0b8b342c5
commit 6988ff02a5
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17 changed files with 316 additions and 17 deletions
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34
Modules/_complex.h Normal file
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/* Workarounds for buggy complex number arithmetic implementations. */
#ifndef Py_HAVE_C_COMPLEX
# error "this header file should only be included if Py_HAVE_C_COMPLEX is defined"
#endif
#include <complex.h>
/* Other compilers (than clang), that claims to
implement C11 *and* define __STDC_IEC_559_COMPLEX__ - don't have
issue with CMPLX(). This is specific to glibc & clang combination:
https://sourceware.org/bugzilla/show_bug.cgi?id=26287
Here we fallback to using __builtin_complex(), available in clang
v12+. Else CMPLX implemented following C11 6.2.5p13: "Each complex type
has the same representation and alignment requirements as an array
type containing exactly two elements of the corresponding real type;
the first element is equal to the real part, and the second element
to the imaginary part, of the complex number.
*/
#if !defined(CMPLX)
# if defined(__clang__) && __has_builtin(__builtin_complex)
# define CMPLX(x, y) __builtin_complex ((double) (x), (double) (y))
# else
static inline double complex
CMPLX(double real, double imag)
{
double complex z;
((double *)(&z))[0] = real;
((double *)(&z))[1] = imag;
return z;
}
# endif
#endif