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7388956b76
Consider this test package:
package p
// enum E { E0 };
// union U { long x; };
// void f(enum E e, union U* up) {}
import "C"
func f() {
C.f(C.enum_E(C.E0), (*C.union_U)(nil))
}
In Go 1.14, cgo translated this to (omitting irrelevant details):
type _Ctype_union_U [8]byte
func f() {
_Cfunc_f(uint32(_Ciconst_E0), (*[8]byte)(nil))
}
func _Cfunc_f(p0 uint32, p1 *[8]byte) (r1 _Ctype_void) { ... }
Notably, _Ctype_union_U was declared as a defined type, but uses were
being rewritten into uses of the underlying type, which matched how
_Cfunc_f was declared.
After CL 230037, cgo started consistently rewriting "C.foo" type
expressions as "_Ctype_foo", which caused it to start emitting:
type _Ctype_enum_E uint32
type _Ctype_union_U [8]byte
func f() {
_Cfunc_f(_Ctype_enum_E(_Ciconst_E0), (*_Ctype_union_U)(nil))
}
// _Cfunc_f unchanged
Of course, this fails to type-check because _Ctype_enum_E and
_Ctype_union_U are defined types.
This CL changes cgo to emit:
type _Ctype_enum_E = uint32
type _Ctype_union_U = [8]byte
// f unchanged since CL 230037
// _Cfunc_f still unchanged
It would probably be better to fix this in (*typeConv).loadType so
that cgo generated code uses the _Ctype_foo aliases too. But as it
wouldn't have any effect on actual compilation, it's not worth the
risk of touching it at this point in the release cycle.
Updates #39537.
Fixes #40494.
Change-Id: I88269660b40aeda80a9a9433777601a781b48ac0
Reviewed-on: https://go-review.googlesource.com/c/go/+/246057
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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|---|---|---|
| .. | ||
| testdata | ||
| backdoor.go | ||
| buildid_linux.go | ||
| callback_c_gc.c | ||
| callback_c_gccgo.c | ||
| callback_c.c | ||
| callback.go | ||
| cgo_linux_test.go | ||
| cgo_stubs_android_test.go | ||
| cgo_test.go | ||
| cgo_thread_lock.go | ||
| cgo_unix_test.go | ||
| cthread_unix.c | ||
| cthread_windows.c | ||
| issue4029.c | ||
| issue4029.go | ||
| issue4029w.go | ||
| issue4273.c | ||
| issue4273b.c | ||
| issue4339.c | ||
| issue4339.h | ||
| issue5548_c.c | ||
| issue5740a.c | ||
| issue5740b.c | ||
| issue6833_c.c | ||
| issue6907export_c.c | ||
| issue6997_linux.c | ||
| issue6997_linux.go | ||
| issue7234_test.go | ||
| issue8148.go | ||
| issue8331.h | ||
| issue8517_windows.c | ||
| issue8517_windows.go | ||
| issue8517.go | ||
| issue8694.go | ||
| issue8811.c | ||
| issue18146.go | ||
| issue20910.c | ||
| issue21897.go | ||
| issue21897b.go | ||
| issue31891.c | ||
| overlaydir_test.go | ||
| pkg_test.go | ||
| setgid_linux.go | ||
| sigaltstack.go | ||
| sigprocmask.c | ||
| sigprocmask.go | ||
| test_unix.go | ||
| test_windows.go | ||
| test.go | ||
| testx.go | ||