test/SILGen/auto_closures.swift

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

struct Bool {}
var false_ = Bool()

// CHECK-LABEL: sil hidden @_T013auto_closures05call_A8_closureAA4BoolVADyXKF : $@convention(thin) (@owned @callee_owned () -> Bool) -> Bool
func call_auto_closure(_ x: @autoclosure () -> Bool) -> Bool {
  // CHECK: bb0([[CLOSURE:%.*]] : $@callee_owned () -> Bool):
  // CHECK: [[BORROWED_CLOSURE:%.*]] = begin_borrow [[CLOSURE]]
  // CHECK: [[CLOSURE_COPY:%.*]] = copy_value [[BORROWED_CLOSURE]]
  // CHECK: [[RET:%.*]] = apply [[CLOSURE_COPY]]()
  // CHECK: end_borrow [[BORROWED_CLOSURE]] from [[CLOSURE]]
  // CHECK: destroy_value [[CLOSURE]]
  // CHECK: return [[RET]]
  return x()
}

// CHECK-LABEL sil @_T013auto_closures05test_A21_closure_with_capture{{[_0-9a-zA-Z]*}}F
func test_auto_closure_with_capture(_ x: Bool) -> Bool {
  // CHECK: [[CLOSURE:%.*]] = function_ref @_T013auto_closures05test_A21_closure_with_capture
  // CHECK: [[WITHCAPTURE:%.*]] = partial_apply [[CLOSURE]](
  // CHECK: [[RET:%.*]] = apply {{%.*}}([[WITHCAPTURE]])
  // CHECK: return [[RET]]
  return call_auto_closure(x)
}

// CHECK-LABEL: sil hidden @_T013auto_closures05test_A24_closure_without_capture{{[_0-9a-zA-Z]*}}F
func test_auto_closure_without_capture() -> Bool {
  // CHECK: [[CLOSURE:%.*]] = function_ref @_T013auto_closures05test_A24_closure_without_capture
  // CHECK: [[THICK:%.*]] = thin_to_thick_function [[CLOSURE]] : $@convention(thin) () -> Bool to $@callee_owned () -> Bool
  // CHECK: [[RET:%.*]] = apply {{%.*}}([[THICK]])
  // CHECK: return [[RET]]
  return call_auto_closure(false_)
}

public class Base {
  var x: Bool { return false_ }
}

public class Sub : Base {
  // CHECK-LABEL: sil hidden @_T013auto_closures3SubC1xAA4BoolVfg : $@convention(method) (@guaranteed Sub) -> Bool {
  // CHECK: bb0([[SELF:%.*]] : $Sub):
  // CHECK: [[AUTOCLOSURE_CONSUMER:%.*]] = function_ref @_T013auto_closures05call_A8_closureAA4BoolVADyXKF : $@convention(thin)
  // CHECK: [[AUTOCLOSURE_FUNC:%.*]] = function_ref @_T013auto_closures3SubC1xAA4BoolVfgAFyXKfu_ : $@convention(thin) (@owned Sub) -> Bool
  // CHECK: [[SELF_COPY:%.*]] = copy_value [[SELF]]
  // CHECK: [[AUTOCLOSURE:%.*]] = partial_apply [[AUTOCLOSURE_FUNC]]([[SELF_COPY]])
  // CHECK: [[RET:%.*]] = apply [[AUTOCLOSURE_CONSUMER]]([[AUTOCLOSURE]])
  // CHECK: return [[RET]] : $Bool
  // CHECK: }

  // CHECK-LABEL: sil private [transparent] @_T013auto_closures3SubC1xAA4BoolVfgAFyXKfu_ : $@convention(thin) (@owned Sub) -> Bool {
  // CHECK: [[SUPER:%[0-9]+]] = function_ref @_T013auto_closures4BaseC1xAA4BoolVfg : $@convention(method) (@guaranteed Base) -> Bool
  // CHECK: [[RET:%.*]] = apply [[SUPER]]({{%.*}})
  // CHECK: return [[RET]]
  override var x: Bool { return call_auto_closure(super.x) }
}

// CHECK-LABEL: sil hidden @_T013auto_closures20closureInAutoclosureAA4BoolVAD_ADtF : $@convention(thin) (Bool, Bool) -> Bool {
// CHECK: }
// CHECK-LABEL: sil private [transparent] @_T013auto_closures20closureInAutoclosureAA4BoolVAD_ADtFADyXKfu_ : $@convention(thin) (Bool, Bool) -> Bool {
// CHECK: }
// CHECK-LABEL: sil private @_T013auto_closures20closureInAutoclosureAA4BoolVAD_ADtFADyXKfu_A2DcfU_ : $@convention(thin) (Bool, Bool) -> Bool {
// CHECK: }
func compareBool(_ lhs: Bool, _ rhs: Bool) -> Bool { return false_ }
func testBool(_ x: Bool, _ pred: (Bool) -> Bool) -> Bool {
  return pred(x)
}
func delayBool(_ fn: @autoclosure () -> Bool) -> Bool {
  return fn()
}
func closureInAutoclosure(_ lhs: Bool, _ rhs: Bool) -> Bool {
  return delayBool(testBool(lhs, { compareBool($0, rhs) }))
}