test/IRGen/c_function_pointer.sil

// RUN: %target-swift-frontend -emit-ir %s | %FileCheck %s -DINT=i%target-ptrsize

import Swift

// CHECK-LABEL: define{{( dllexport)?}}{{( protected)?}} void @c_native_function_pointer(void ()*)
sil @c_native_function_pointer : $@convention(c) (@convention(c) () -> ()) -> () {
entry(%f : $@convention(c) () -> ()):
  return undef : $()
}

// CHECK-LABEL: define{{( dllexport)?}}{{( protected)?}} swiftcc void @call_with_native_c_function_pointer(i8*)
sil @call_with_native_c_function_pointer : $@convention(thin) (@convention(c) () -> ()) -> () {
entry(%f : $@convention(c) () -> ()):
  %c = function_ref @c_native_function_pointer : $@convention(c) (@convention(c) () -> ()) -> ()
  %z = apply %c(%f) : $@convention(c) (@convention(c) () -> ()) -> ()
  return %z : $()
}