generic_casts.swift

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

protocol ClassBound : class {}
protocol NotClassBound {}

class C : ClassBound, NotClassBound {}
struct S : NotClassBound {}
struct Unloadable : NotClassBound { var x : NotClassBound }

// CHECK-LABEL: sil hidden @_TF13generic_casts36opaque_archetype_to_opaque_archetype{{.*}}
func opaque_archetype_to_opaque_archetype
<T:NotClassBound, U>(t:T) -> U {
  return t as! U
  // CHECK: bb0([[RET:%.*]] : $*U, {{%.*}}: $*T):
  // CHECK:   unconditional_checked_cast_addr take_always T in {{%.*}} : $*T to U in [[RET]] : $*U
}

// CHECK-LABEL: sil hidden @_TF13generic_casts36opaque_archetype_is_opaque_archetype{{.*}}
func opaque_archetype_is_opaque_archetype
<T:NotClassBound, U>(t:T, u:U.Type) -> Bool {
  return t is U
  // CHECK:   checked_cast_addr_br take_always T in [[VAL:%.*]]#1 : $*T to U in [[DEST:%.*]]#1 : $*U, [[YES:bb[0-9]+]], [[NO:bb[0-9]+]]
  // CHECK: [[YES]]:
  // CHECK:   [[Y:%.*]] = integer_literal $Builtin.Int1, -1
  // CHECK:   destroy_addr [[DEST]]#1
  // CHECK:   br [[CONT:bb[0-9]+]]([[Y]] : $Builtin.Int1)
  // CHECK: [[NO]]:
  // CHECK:   [[N:%.*]] = integer_literal $Builtin.Int1, 0
  // CHECK:   br [[CONT]]([[N]] : $Builtin.Int1)
  // CHECK: [[CONT]]([[I1:%.*]] : $Builtin.Int1):
  // -- apply the _getBool library fn
  // CHECK-NEXT:  function_ref Swift._getBool
  // CHECK-NEXT:  [[GETBOOL:%.*]] = function_ref @_TFs8_getBoolFBi1_Sb :
  // CHECK-NEXT:  [[RES:%.*]] = apply [[GETBOOL]]([[I1]])
  // -- we don't consume the checked value
  // CHECK:   return [[RES]] : $Bool
}

// CHECK-LABEL: sil hidden @_TF13generic_casts35opaque_archetype_to_class_archetype{{.*}}
func opaque_archetype_to_class_archetype
<T:NotClassBound, U:ClassBound> (t:T) -> U {
  return t as! U
  // CHECK: unconditional_checked_cast_addr take_always T in {{%.*}} : $*T to U in [[DOWNCAST_ADDR:%.*]] : $*U
  // CHECK: [[DOWNCAST:%.*]] = load [[DOWNCAST_ADDR]] : $*U
  // CHECK: return [[DOWNCAST]] : $U
}

// CHECK-LABEL: sil hidden @_TF13generic_casts35opaque_archetype_is_class_archetype{{.*}}
func opaque_archetype_is_class_archetype
<T:NotClassBound, U:ClassBound> (t:T, u:U.Type) -> Bool {
  return t is U
  // CHECK: copy_addr {{.*}} : $*T
  // CHECK: checked_cast_addr_br take_always T in [[VAL:%.*]] : {{.*}} to U
}

// CHECK-LABEL: sil hidden @_TF13generic_casts34class_archetype_to_class_archetype{{.*}}
func class_archetype_to_class_archetype
<T:ClassBound, U:ClassBound>(t:T) -> U {
  return t as! U
  // CHECK: unconditional_checked_cast_addr {{.*}} T in {{%.*}} : $*T to U in [[DOWNCAST_ADDR:%.*]] : $*U
  // CHECK: [[DOWNCAST:%.*]] = load [[DOWNCAST_ADDR]]
  // CHECK: return [[DOWNCAST]] : $U
}

// CHECK-LABEL: sil hidden @_TF13generic_casts34class_archetype_is_class_archetype{{.*}}
func class_archetype_is_class_archetype
<T:ClassBound, U:ClassBound>(t:T, u:U.Type) -> Bool {
  return t is U
  // CHECK: checked_cast_addr_br {{.*}} T in {{%.*}} : $*T to U in {{%.*}} : $*U
}

// CHECK-LABEL: sil hidden @_TF13generic_casts38opaque_archetype_to_addr_only_concrete{{.*}}
func opaque_archetype_to_addr_only_concrete
<T:NotClassBound> (t:T) -> Unloadable {
  return t as! Unloadable
  // CHECK: bb0([[RET:%.*]] : $*Unloadable, {{%.*}}: $*T):
  // CHECK:   unconditional_checked_cast_addr take_always T in {{%.*}} : $*T to Unloadable in [[RET]] : $*Unloadable
}

// CHECK-LABEL: sil hidden @_TF13generic_casts38opaque_archetype_is_addr_only_concrete{{.*}}
func opaque_archetype_is_addr_only_concrete
<T:NotClassBound> (t:T) -> Bool {
  return t is Unloadable
  // CHECK: checked_cast_addr_br take_always T in [[VAL:%.*]] : {{.*}} to Unloadable in
}

// CHECK-LABEL: sil hidden @_TF13generic_casts37opaque_archetype_to_loadable_concrete{{.*}}
func opaque_archetype_to_loadable_concrete
<T:NotClassBound>(t:T) -> S {
  return t as! S
  // CHECK: unconditional_checked_cast_addr take_always T in {{%.*}} : $*T to S in [[DOWNCAST_ADDR:%.*]] : $*S
  // CHECK: [[DOWNCAST:%.*]] = load [[DOWNCAST_ADDR]] : $*S
  // CHECK: return [[DOWNCAST]] : $S
}

// CHECK-LABEL: sil hidden @_TF13generic_casts37opaque_archetype_is_loadable_concrete{{.*}}
func opaque_archetype_is_loadable_concrete
<T:NotClassBound>(t:T) -> Bool {
  return t is S
  // CHECK: checked_cast_addr_br take_always T in {{%.*}} : $*T to S in
}

// CHECK-LABEL: sil hidden @_TF13generic_casts24class_archetype_to_class{{.*}}
func class_archetype_to_class
<T:ClassBound>(t:T) -> C {
  return t as! C
  // CHECK: [[DOWNCAST:%.*]] = unconditional_checked_cast {{%.*}} to $C
  // CHECK: return [[DOWNCAST]] : $C
}

// CHECK-LABEL: sil hidden @_TF13generic_casts24class_archetype_is_class{{.*}}
func class_archetype_is_class
<T:ClassBound>(t:T) -> Bool {
  return t is C
  // CHECK: checked_cast_br {{%.*}} to $C
}

// CHECK-LABEL: sil hidden @_TF13generic_casts38opaque_existential_to_opaque_archetype{{.*}}
func opaque_existential_to_opaque_archetype
<T:NotClassBound>(p:NotClassBound) -> T {
  return p as! T
  // CHECK: bb0([[RET:%.*]] : $*T, [[ARG:%.*]] : $*NotClassBound):
  // CHECK:      [[TEMP:%.*]] = alloc_stack $NotClassBound
  // CHECK-NEXT: copy_addr [[ARG]] to [initialization] [[TEMP]]#1
  // CHECK-NEXT: unconditional_checked_cast_addr take_always NotClassBound in [[TEMP]]#1 : $*NotClassBound to T in [[RET]] : $*T
  // CHECK-NEXT: dealloc_stack [[TEMP]]#0
  // CHECK-NEXT: destroy_addr [[ARG]]
  // CHECK-NEXT: [[T0:%.*]] = tuple ()
  // CHECK-NEXT: return [[T0]]
}

// CHECK-LABEL: sil hidden @_TF13generic_casts38opaque_existential_is_opaque_archetype{{.*}}
func opaque_existential_is_opaque_archetype
<T:NotClassBound>(p:NotClassBound, _: T) -> Bool {
  return p is T
  // CHECK:   checked_cast_addr_br take_always NotClassBound in [[CONTAINER:%.*]] : {{.*}} to T in
}

// CHECK-LABEL: sil hidden @_TF13generic_casts37opaque_existential_to_class_archetype{{.*}}
func opaque_existential_to_class_archetype
<T:ClassBound>(p:NotClassBound) -> T {
  return p as! T
  // CHECK: unconditional_checked_cast_addr take_always NotClassBound in {{%.*}} : $*NotClassBound to T in [[DOWNCAST_ADDR:%.*]] : $*T
  // CHECK: [[DOWNCAST:%.*]] = load [[DOWNCAST_ADDR]] : $*T
  // CHECK: return [[DOWNCAST]] : $T
}

// CHECK-LABEL: sil hidden @_TF13generic_casts37opaque_existential_is_class_archetype{{.*}}
func opaque_existential_is_class_archetype
<T:ClassBound>(p:NotClassBound, _: T) -> Bool {
  return p is T
  // CHECK: checked_cast_addr_br take_always NotClassBound in {{%.*}} : $*NotClassBound to T in
}

// CHECK-LABEL: sil hidden @_TF13generic_casts36class_existential_to_class_archetype{{.*}}
func class_existential_to_class_archetype
<T:ClassBound>(p:ClassBound) -> T {
  return p as! T
  // CHECK: unconditional_checked_cast_addr {{.*}} ClassBound in {{%.*}} : $*ClassBound to T in [[DOWNCAST_ADDR:%.*]] : $*T
  // CHECK: [[DOWNCAST:%.*]] = load [[DOWNCAST_ADDR]]
  // CHECK: return [[DOWNCAST]] : $T
}

// CHECK-LABEL: sil hidden @_TF13generic_casts36class_existential_is_class_archetype{{.*}}
func class_existential_is_class_archetype
<T:ClassBound>(p:ClassBound, _: T) -> Bool {
  return p is T
  // CHECK: checked_cast_addr_br {{.*}} ClassBound in {{%.*}} : $*ClassBound to T in {{%.*}} : $*T
}

// CHECK-LABEL: sil hidden @_TF13generic_casts40opaque_existential_to_addr_only_concrete{{.*}}
func opaque_existential_to_addr_only_concrete(p: NotClassBound) -> Unloadable {
  return p as! Unloadable
  // CHECK: bb0([[RET:%.*]] : $*Unloadable, {{%.*}}: $*NotClassBound):
  // CHECK:   unconditional_checked_cast_addr take_always NotClassBound in {{%.*}} : $*NotClassBound to Unloadable in [[RET]] : $*Unloadable
}

// CHECK-LABEL: sil hidden @_TF13generic_casts40opaque_existential_is_addr_only_concrete{{.*}}
func opaque_existential_is_addr_only_concrete(p: NotClassBound) -> Bool {
  return p is Unloadable
  // CHECK:   checked_cast_addr_br take_always NotClassBound in {{%.*}} : $*NotClassBound to Unloadable in
}

// CHECK-LABEL: sil hidden @_TF13generic_casts39opaque_existential_to_loadable_concrete{{.*}}
func opaque_existential_to_loadable_concrete(p: NotClassBound) -> S {
  return p as! S
  // CHECK:   unconditional_checked_cast_addr take_always NotClassBound in {{%.*}} : $*NotClassBound to S in [[DOWNCAST_ADDR:%.*]] : $*S
  // CHECK: [[DOWNCAST:%.*]] = load [[DOWNCAST_ADDR]] : $*S
  // CHECK: return [[DOWNCAST]] : $S
}

// CHECK-LABEL: sil hidden @_TF13generic_casts39opaque_existential_is_loadable_concrete{{.*}}
func opaque_existential_is_loadable_concrete(p: NotClassBound) -> Bool {
  return p is S
  // CHECK: checked_cast_addr_br take_always NotClassBound in {{%.*}} : $*NotClassBound to S in
}

// CHECK-LABEL: sil hidden @_TF13generic_casts26class_existential_to_class{{.*}}
func class_existential_to_class(p: ClassBound) -> C {
  return p as! C
  // CHECK: [[DOWNCAST:%.*]] = unconditional_checked_cast {{%.*}} to $C
  // CHECK: return [[DOWNCAST]] : $C
}

// CHECK-LABEL: sil hidden @_TF13generic_casts26class_existential_is_class{{.*}}
func class_existential_is_class(p: ClassBound) -> Bool {
  return p is C
  // CHECK: checked_cast_br {{%.*}} to $C
}

// CHECK-LABEL: sil hidden @_TF13generic_casts27optional_anyobject_to_classFGSqPs9AnyObject__GSqCS_1C_ 
// CHECK:         checked_cast_br {{%.*}} : $AnyObject to $C
func optional_anyobject_to_class(p: AnyObject?) -> C? {
  return p as? C
}