// RUN: %target-swift-frontend -emit-ir %s | FileCheck %s

import Swift

// CHECK-LABEL: define{{( 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{{( protected)?}} 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 : $()
}

// CHECK-LABEL: define{{( protected)?}} %swift.type* @c_function_pointer_metadata()
sil @c_function_pointer_metadata : $@convention(thin) () -> @thick Any.Type {
entry:
  // CHECK: call %swift.type* @_TMacT_T_()
  %m = metatype $@thick (@convention(c) () -> ()).Type
  %a = init_existential_metatype %m : $@thick (@convention(c) () -> ()).Type, $@thick Any.Type
  return %a : $@thick Any.Type
}

// CHECK-LABEL: define linkonce_odr hidden %swift.type* @_TMacT_T_()
// --                                                                               0x3000001 -- C convention, 1 argument
// CHECK:         call %swift.type* @swift_getFunctionTypeMetadata1([[WORD:i(32|64)]] 50331649