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// RUN: %target-swift-emit-silgen -module-name casts %s | %FileCheck %s
class B { }
class D : B { }
// CHECK-LABEL: sil hidden [ossa] @$s5casts6upcast{{[_0-9a-zA-Z]*}}F
func upcast(d: D) -> B {
// CHECK: {{%.*}} = upcast
return d
}
// CHECK-LABEL: sil hidden [ossa] @$s5casts8downcast{{[_0-9a-zA-Z]*}}F
func downcast(b: B) -> D {
// CHECK: {{%.*}} = unconditional_checked_cast
return b as! D
}
// CHECK-LABEL: sil hidden [ossa] @$s5casts3isa{{[_0-9a-zA-Z]*}}F
func isa(b: B) -> Bool {
// CHECK: bb0([[ARG:%.*]] : @guaranteed $B):
// CHECK: [[COPIED_BORROWED_ARG:%.*]] = copy_value [[ARG]]
// CHECK: checked_cast_br B in [[COPIED_BORROWED_ARG]] : $B to D, [[YES:bb[0-9]+]], [[NO:bb[0-9]+]]
//
// CHECK: [[YES]]([[CASTED_VALUE:%.*]] : @owned $D):
// CHECK: integer_literal {{.*}} -1
// CHECK: destroy_value [[CASTED_VALUE]]
//
// CHECK: [[NO]]([[ORIGINAL_VALUE:%.*]] : @owned $B):
// CHECK: destroy_value [[ORIGINAL_VALUE]]
// CHECK: integer_literal {{.*}} 0
return b is D
}
// CHECK-LABEL: sil hidden [ossa] @$s5casts16upcast_archetype{{[_0-9a-zA-Z]*}}F
func upcast_archetype<T : B>(t: T) -> B {
// CHECK: {{%.*}} = upcast
return t
}
// CHECK-LABEL: sil hidden [ossa] @$s5casts25upcast_archetype_metatype{{[_0-9a-zA-Z]*}}F
func upcast_archetype_metatype<T : B>(t: T.Type) -> B.Type {
// CHECK: {{%.*}} = upcast
return t
}
// CHECK-LABEL: sil hidden [ossa] @$s5casts18downcast_archetype{{[_0-9a-zA-Z]*}}F
func downcast_archetype<T : B>(b: B) -> T {
// CHECK: {{%.*}} = unconditional_checked_cast
return b as! T
}
// This is making sure that we do not have the default propagating behavior in
// the address case.
//
// CHECK-LABEL: sil hidden [ossa] @$s5casts12is_archetype{{[_0-9a-zA-Z]*}}F
func is_archetype<T : B>(b: B, _: T) -> Bool {
// CHECK: bb0([[ARG1:%.*]] : @guaranteed $B, [[ARG2:%.*]] : @guaranteed $T):
// CHECK: checked_cast_br {{.*}}, [[YES:bb[0-9]+]], [[NO:bb[0-9]+]]
// CHECK: [[YES]]([[CASTED_ARG:%.*]] : @owned $T):
// CHECK: integer_literal {{.*}} -1
// CHECK: destroy_value [[CASTED_ARG]]
// CHECK: [[NO]]([[ORIGINAL_VALUE:%.*]] : @owned $B):
// CHECK: destroy_value [[ORIGINAL_VALUE]]
// CHECK: integer_literal {{.*}} 0
return b is T
}
// CHECK: } // end sil function '$s5casts12is_archetype{{[_0-9a-zA-Z]*}}F'
// CHECK: sil hidden [ossa] @$s5casts20downcast_conditional{{[_0-9a-zA-Z]*}}F
// CHECK: checked_cast_br B in {{%.*}} : $B to D
// CHECK: bb{{[0-9]+}}({{.*}} : $Optional<D>)
func downcast_conditional(b: B) -> D? {
return b as? D
}
protocol P {}
struct S : P {}
// CHECK: sil hidden [ossa] @$s5casts32downcast_existential_conditional{{[_0-9a-zA-Z]*}}F
// CHECK: bb0([[IN:%.*]] : $*any P):
// CHECK: [[COPY:%.*]] = alloc_stack $any P
// CHECK: copy_addr [[IN]] to [init] [[COPY]]
// CHECK: [[TMP:%.*]] = alloc_stack $S
// CHECK: checked_cast_addr_br take_always any P in [[COPY]] : $*any P to S in [[TMP]] : $*S, bb1, bb2
// Success block.
// CHECK: bb1:
// CHECK: [[T0:%.*]] = load [trivial] [[TMP]] : $*S
// CHECK: [[T1:%.*]] = enum $Optional<S>, #Optional.some!enumelt, [[T0]] : $S
// CHECK: dealloc_stack [[TMP]]
// CHECK: br bb3([[T1]] : $Optional<S>)
// Failure block.
// CHECK: bb2:
// CHECK: [[T0:%.*]] = enum $Optional<S>, #Optional.none!enumelt
// CHECK: dealloc_stack [[TMP]]
// CHECK: br bb3([[T0]] : $Optional<S>)
// Continuation block.
// CHECK: bb3([[RESULT:%.*]] : $Optional<S>):
// CHECK: dealloc_stack [[COPY]]
// CHECK: return [[RESULT]]
func downcast_existential_conditional(p: P) -> S? {
return p as? S
}
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