test/IRGen/metatype_casts.sil

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

// REQUIRES: CPU=i386_or_x86_64
// XFAIL: linux

import Swift

// CHECK-LABEL: define{{( protected)?}} void @archetype_metatype_cast
// CHECK:         %0 = call %swift.type* @swift_dynamicCastMetatype(%swift.type* %T, %swift.type* %U)
// CHECK:         %1 = icmp ne %swift.type* %0, null
sil @archetype_metatype_cast : $@convention(thin) <T, U> () -> () {
entry:
  %0 = metatype $@thick T.Type
  checked_cast_br %0 : $@thick T.Type to $@thick U.Type, yes, no
yes(%1 : $@thick U.Type):
  br end

no:
  br end

end:
  return undef : $()
}

protocol P {}

// CHECK-LABEL: define{{( protected)?}} void @existential_archetype_metatype_cast(%swift.type*, i8**, %swift.type* %T)
// CHECK:         [[T0:%.*]] = call %swift.type* @swift_dynamicCastMetatype(%swift.type* %0, %swift.type* %T)
// CHECK:         [[T1:%.*]] = icmp ne %swift.type* [[T0]], null
sil @existential_archetype_metatype_cast : $@convention(thin) <T> (@thick P.Type) -> () {
entry(%0 : $@thick P.Type):
  checked_cast_br %0 : $@thick P.Type to $@thick T.Type, yes, no
yes(%1 : $@thick T.Type):
  br end

no:
  br end

end:
  return undef : $()
}

class SomeClass {}
sil_vtable SomeClass {}

// CHECK-LABEL: define{{( protected)?}} %objc_object* @metatype_object_conversion(%objc_class*) {{.*}} {
// CHECK:         %1 = bitcast %objc_class* %0 to %objc_object*
// CHECK:         ret %objc_object* %1
// CHECK:       }
sil @metatype_object_conversion : $@convention(thin) (@objc_metatype SomeClass.Type) -> @owned AnyObject {
entry(%m : $@objc_metatype SomeClass.Type):
  %o = objc_metatype_to_object %m : $@objc_metatype SomeClass.Type to $AnyObject
  return %o : $AnyObject
}

protocol SomeClassProtocol : class {}

// CHECK-LABEL: define{{( protected)?}} %objc_object* @existential_metatype_object_conversion(%objc_class*, i8**) {{.*}} {
// CHECK:         [[T0:%.*]] = bitcast %objc_class* %0 to %objc_object*
// CHECK:         ret %objc_object* [[T0]]
// CHECK:       }
sil @existential_metatype_object_conversion : $@convention(thin) (@objc_metatype SomeClassProtocol.Type) -> @owned AnyObject {
entry(%m : $@objc_metatype SomeClassProtocol.Type):
  %o = objc_existential_metatype_to_object %m : $@objc_metatype SomeClassProtocol.Type to $AnyObject
  return %o : $AnyObject
}

class OtherClass : SomeClass {}
sil_vtable OtherClass {}

// CHECK-LABEL: define{{( protected)?}} void @value_metatype_cast(%C14metatype_casts9SomeClass*)
// CHECK:         [[T0:%.*]] = bitcast %C14metatype_casts9SomeClass* %0 to %swift.type**
// CHECK:         [[T1:%.*]] = load %swift.type*, %swift.type** [[T0]]
// CHECK:         [[T2:%.*]] = icmp eq %swift.type* [[T1]], {{.*}} @_TMfC14metatype_casts10OtherClass
sil @value_metatype_cast : $@convention(thin) (SomeClass) -> () {
entry(%0 : $SomeClass):
  %1 = value_metatype $@thick SomeClass.Type, %0 : $SomeClass
  checked_cast_br [exact] %1 : $@thick SomeClass.Type to $@thick OtherClass.Type, yes, no

yes(%2 : $@thick OtherClass.Type):
  br end

no:
  br end

end:
  return undef : $()
}

// CHECK-LABEL: define{{( protected)?}} %swift.type* @checked_cast_to_anyobject_type
// CHECK:         [[METATYPE:%.*]] = call %swift.type* @_TMaC14metatype_casts9SomeClass()
// CHECK:         [[T0:%.*]] = bitcast %swift.type* [[METATYPE]] to i8*
// CHECK:         [[CAST:%.*]] = call { i8* } @dynamic_cast_existential_0_class_unconditional(i8* [[T0]], %swift.type* [[METATYPE]])
// CHECK:         [[RESULT0:%.*]] = extractvalue { i8* } [[CAST]], 0
// CHECK:         [[RESULT:%.*]] = bitcast i8* [[RESULT0]] to %swift.type*
// CHECK:         ret %swift.type* [[RESULT]]
sil @checked_cast_to_anyobject_type : $@convention(thin) () -> @thick AnyObject.Type {
entry:
  %1 = metatype $@thick SomeClass.Type
  %2 = unconditional_checked_cast %1 : $@thick SomeClass.Type to $@thick AnyObject.Type
  return %2 : $@thick AnyObject.Type
}