test/IRGen/objc_protocol_conversion.sil

// RUN: rm -rf %t && mkdir -p %t
// RUN: %build-irgen-test-overlays
// RUN: %target-swift-frontend -assume-parsing-unqualified-ownership-sil -sdk %S/Inputs -I %t %s -emit-ir | %FileCheck %s

// REQUIRES: CPU=x86_64
// REQUIRES: objc_interop

sil_stage canonical

import Swift
import ObjectiveC

@objc protocol OP {}

// CHECK-LABEL: define{{( protected)?}} swiftcc %TSo8ProtocolC* @protocol_conversion() {{.*}} {
// CHECK:         %0 = load i8*, i8** @"\01l_OBJC_PROTOCOL_REFERENCE_$__TtP24objc_protocol_conversion2OP_", align 8
// CHECK:         %1 = bitcast i8* %0 to %TSo8ProtocolC*
// CHECK:         ret %TSo8ProtocolC* %1
// CHECK:       }

sil @protocol_conversion : $@convention(thin) () -> @owned Protocol {
entry:
  %p = objc_protocol #OP : $Protocol
  return %p : $Protocol
}

// The Protocol class has been hidden in newer ObjC APIs, so when we need its
// metadata, we treat it like a foreign class.
// CHECK-LABEL: define{{( protected)?}} swiftcc %swift.type* @protocol_metatype()
sil @protocol_metatype : $@convention(thin) () -> @thick Protocol.Type {
entry:
  // CHECK: call %objc_class* @objc_lookUpClass
  // CHECK: call %swift.type* @swift_getObjCClassMetadata
  %t = metatype $@thick Protocol.Type
  return %t : $@thick Protocol.Type
}