where is math_sin defined?
Barry Scott
barry at barrys-emacs.org
Sun Feb 10 10:53:32 EST 2019
On Sunday, 10 February 2019 15:15:32 GMT Jon Ribbens wrote:
> As an aside, how is 'math.sin' actually implemented? mathmodule.c
> refers to the function 'math_sin' but that name is not defined
> anywhere in the Python source code. I'm a bit mystified as to how
> CPython manages to compile!
I used gdb to find it:
Breakpoint 1, math_sin (self=<module at remote 0x7fffea716098>, args=0) at /
usr/src/debug/python3-3.7.2-4.fc29.x86_64/Modules/mathmodule.c:1176
1176 FUNC1(sin, sin, 0,
(gdb) l
1171 "remainder($module, x, y, /)\n--\n\n"
1172 "Difference between x and the closest integer multiple of y.
\n\n"
1173 "Return x - n*y where n*y is the closest integer multiple of y.
\n"
1174 "In the case where x is exactly halfway between two multiples
of\n"
1175 "y, the nearest even value of n is used. The result is always
exact.")
1176 FUNC1(sin, sin, 0,
1177 "sin($module, x, /)\n--\n\n"
1178 "Return the sine of x (measured in radians).")
1179 FUNC1(sinh, sinh, 1,
1180 "sinh($module, x, /)\n--\n\n"
(gdb)
Barry
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