test/SILGen/unmanaged_ownership.swift

// RUN: %target-swift-frontend -enable-sil-ownership -parse-stdlib -module-name Swift -emit-silgen %s | %FileCheck %s

class C {}

enum Optional<T> {
case none
case some(T)
}

precedencegroup AssignmentPrecedence {
  assignment: true
  associativity: right
}

struct Holder {
  unowned(unsafe) var value: C
}

_ = Holder(value: C())
// CHECK-LABEL:sil hidden @_T0s6HolderV{{[_0-9a-zA-Z]*}}fC : $@convention(method) (@owned C, @thin Holder.Type) -> Holder
// CHECK: bb0([[T0:%.*]] : @owned $C,
// CHECK-NEXT:   [[T1:%.*]] = ref_to_unmanaged [[T0]] : $C to $@sil_unmanaged C
// CHECK-NEXT:   destroy_value [[T0]] : $C
// CHECK-NEXT:   [[T2:%.*]] = struct $Holder ([[T1]] : $@sil_unmanaged C)
// CHECK-NEXT:   return [[T2]] : $Holder
// CHECK-NEXT: } // end sil function '_T0s6HolderVABs1CC5value_tcfC'
func set(holder holder: inout Holder) {
  holder.value = C()
}

// CHECK-LABEL: sil hidden @_T0s3setys6HolderVz6holder_tF : $@convention(thin) (@inout Holder) -> () {
// CHECK: bb0([[ADDR:%.*]] : @trivial $*Holder):
// CHECK:        [[T0:%.*]] = function_ref @_T0s1CC{{[_0-9a-zA-Z]*}}fC
// CHECK:        [[C:%.*]] = apply [[T0]](
// CHECK-NEXT:   [[WRITE:%.*]] = begin_access [modify] [unknown] [[ADDR]] : $*Holder
// CHECK-NEXT:   [[T0:%.*]] = struct_element_addr [[WRITE]] : $*Holder, #Holder.value
// CHECK-NEXT:   [[T1:%.*]] = ref_to_unmanaged [[C]]
// CHECK-NEXT:   assign [[T1]] to [[T0]]
// CHECK-NEXT:   destroy_value [[C]]
// CHECK-NEXT:   end_access [[WRITE]] : $*Holder
// CHECK: } // end sil function '_T0s3setys6HolderVz6holder_tF'

func get(holder holder: inout Holder) -> C {
  return holder.value
}
// CHECK-LABEL: sil hidden @_T0s3gets1CCs6HolderVz6holder_tF : $@convention(thin) (@inout Holder) -> @owned C {
// CHECK: bb0([[ADDR:%.*]] : @trivial $*Holder):
// CHECK-NEXT:   debug_value_addr %0 : $*Holder, var, name "holder", argno 1 
// CHECK-NEXT:   [[READ:%.*]] = begin_access [read] [unknown] [[ADDR]] : $*Holder
// CHECK-NEXT:   [[T0:%.*]] = struct_element_addr [[READ]] : $*Holder, #Holder.value
// CHECK-NEXT:   [[T1:%.*]] = load [trivial] [[T0]] : $*@sil_unmanaged C
// CHECK-NEXT:   [[T2:%.*]] = unmanaged_to_ref [[T1]]
// CHECK-NEXT:   [[T2_COPY:%.*]] = copy_value [[T2]]
// CHECK-NEXT:   end_access [[READ]] : $*Holder
// CHECK-NEXT:   return [[T2_COPY]]

func project(fn fn: () -> Holder) -> C {
  return fn().value
}
// CHECK-LABEL: sil hidden @_T0s7projects1CCs6HolderVyc2fn_tF : $@convention(thin) (@owned @callee_owned () -> Holder) -> @owned C {
// CHECK: bb0([[FN:%.*]] : @owned $@callee_owned () -> Holder):
// CHECK:      [[BORROWED_FN:%.*]] = begin_borrow [[FN]]
// CHECK-NEXT: [[BORROWED_FN_COPY:%.*]] = copy_value [[BORROWED_FN]]
// CHECK-NEXT: [[T0:%.*]] = apply [[BORROWED_FN_COPY]]()
// CHECK-NEXT: [[T1:%.*]] = struct_extract [[T0]] : $Holder, #Holder.value
// CHECK-NEXT: [[T2:%.*]] = unmanaged_to_ref [[T1]]
// CHECK-NEXT: [[COPIED_T2:%.*]] = copy_value [[T2]]
// CHECK-NEXT: end_borrow [[BORROWED_FN]] from [[FN]]
// CHECK-NEXT: destroy_value [[FN]]
// CHECK-NEXT: return [[COPIED_T2]]