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cgo: implement C unions

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Unions are somewhat hard to implement in Go because they are not a
native type. But it is actually possible with some compiler magic.

This commit inserts a special "C union" field at the start of a struct
to indicate that it is a union. As such a field cannot be written
directly in Go, this is a useful to distinguish structs and unions.
This commit is contained in:
Ayke van Laethem
2019-04-11 23:14:10 +02:00
committed by Ron Evans
parent 536086988c
commit d2b3a5486c
8 changed files with 206 additions and 22 deletions
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testdata/cgo/out.txt
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@@ -14,3 +14,13 @@ double: +3.200000e+000
complex float: (+4.100000e+000+3.300000e+000i)
complex double: (+4.200000e+000+3.400000e+000i)
complex long double: (+4.300000e+000+3.500000e+000i)
struct: true 256 -123456 +3.140000e+000
array: 5 6 7
union: true
union s: 22
union f: +3.140000e+000
union global data: 5 8 1
union local data: 5 8 1
union s method: -33 false
union f: +6.280000e+000
union field: +6.280000e+000