test/IRGen/witness_method.sil

// RUN: %target-swift-frontend %s -emit-ir | FileCheck --check-prefix=CHECK --check-prefix=CHECK-%target-cpu %s

// REQUIRES: CPU=i386_or_x86_64

sil_stage canonical

protocol DefCon {
  init()
}


// CHECK-LABEL: define{{( protected)?}} void @defcon(%swift.opaque* noalias nocapture sret, %swift.type*, %swift.type* %T, i8** %T.DefCon) {{.*}} {
sil @defcon : $@convention(thin) <T: DefCon> (@thick T.Type) -> @out T {
entry(%0: $*T, %1: $@thick T.Type):

  // CHECK-i386:   [[WITNESS:%.*]] = load i8*, i8** %T.DefCon, align 4
  // CHECK-x86_64: [[WITNESS:%.*]] = load i8*, i8** %T.DefCon, align 8
  // CHECK: [[METHOD:%.*]] = bitcast i8* [[WITNESS]] to void (%swift.opaque*, %swift.type*, %swift.type*, i8**)*
  // CHECK: call void [[METHOD]]
  %m = witness_method $T, #DefCon.init!allocator.1 : $@convention(witness_method) <U: DefCon> (@thick U.Type) -> @out U
  %z = apply %m<T>(%0, %1) : $@convention(witness_method) <V: DefCon> (@thick V.Type) -> @out V
  return %z : $()
}

// rdar://24141848
protocol Base {
  func foo()
}
protocol Derived : Base {}
struct ImplementsDerived : Derived {
  func foo() {}
}

// CHECK-LABEL: define{{( protected)?}} void @testInheritedConformance
sil @testInheritedConformance : $@convention(thin) (@in ImplementsDerived) -> () {
entry(%0: $*ImplementsDerived):
  // CHECK: [[WITNESS:%.*]] = load i8*, i8** @_TWPV14witness_method17ImplementsDerivedS_4BaseS_
  // CHECK: [[METHOD:%.*]] = bitcast i8* [[WITNESS]] to void (%swift.opaque*, %swift.type*, i8**)*
  // CHECK: call void [[METHOD]]
  %m = witness_method $ImplementsDerived, #Base.foo!1 : $@convention(witness_method) <U: Base> (@in_guaranteed U) -> ()
  %z = apply %m<ImplementsDerived>(%0) : $@convention(witness_method) <V: Base> (@in_guaranteed V) -> ()
  return %z : $()
}


// Make sure a witness_method call with a generic Self type uses the correct
// calling convention.

protocol Synergy {
  associatedtype LowHangingFruit

  func actionItem() -> LowHangingFruit
}

struct SyncUp<Deliverable> : Synergy {
  let d: Deliverable

  func actionItem() -> Deliverable {
    return d
  }
}

// CHECK-LABEL: define{{( protected)?}} void @testGenericWitnessMethod(%swift.opaque* noalias nocapture sret, %V14witness_method6SyncUp* noalias nocapture, %swift.type* %T)
// CHECK: entry:
// CHECK:   [[METADATA:%.*]] = call %swift.type* @_TMaV14witness_method6SyncUp(%swift.type* %T)
// CHECK:   [[WTABLE:%.*]] = call i8** @_TWaurGV14witness_method6SyncUpx_S_7SynergyS_(%swift.type* [[METADATA]])
// CHECK:   [[WITNESS_ADDR:%.*]] = getelementptr inbounds i8*, i8** [[WTABLE]], i32 1
// CHECK:   [[WITNESS_FN:%.*]] = load i8*, i8** [[WITNESS_ADDR]]
// CHECK:   [[WITNESS:%.*]] = bitcast i8* [[WITNESS_FN]] to void (%swift.opaque*, %swift.opaque*, %swift.type*, i8**)*
// CHECK:   [[ARG:%.*]] = bitcast %V14witness_method6SyncUp* %1 to %swift.opaque*
// CHECK:   call void [[WITNESS]](%swift.opaque* noalias nocapture sret %0, %swift.opaque* noalias nocapture [[ARG]], %swift.type* [[METADATA]], i8** [[WTABLE]])
// CHECK:   ret void

sil @testGenericWitnessMethod : $@convention(thin) <T> (@in SyncUp<T>) -> @out T {
entry(%ret : $*T, %self : $*SyncUp<T>):
  %m = witness_method $SyncUp<T>, #Synergy.actionItem!1 : $@convention(witness_method) <U: Synergy> (@in_guaranteed U) -> @out U.LowHangingFruit
  %z = apply %m<SyncUp<T>, T>(%ret, %self) : $@convention(witness_method) <U: Synergy> (@in_guaranteed U) -> @out U.LowHangingFruit
  return %z : $()
}

protocol Pivot {}

protocol Strategy {
  associatedtype GrowthHack : Pivot

  func disrupt() -> GrowthHack
}

// CHECK-LABEL: define{{( protected)?}} void @testArchetypeWitnessMethod(%swift.opaque* noalias nocapture sret, %swift.opaque* noalias nocapture, %swift.type* %T, i8** %T.Strategy)
// CHECK: entry:
// CHECK:   [[WITNESS_ADDR:%.*]] = getelementptr inbounds i8*, i8** %T.Strategy, i32 2
// CHECK:   [[WITNESS_FN:%.*]] = load i8*, i8** [[WITNESS_ADDR]]
// CHECK:   [[WITNESS:%.*]] = bitcast i8* [[WITNESS_FN]] to void (%swift.opaque*, %swift.opaque*, %swift.type*, i8**)*
// CHECK:   call void [[WITNESS]](%swift.opaque* noalias nocapture sret %0, %swift.opaque* noalias nocapture %1, %swift.type* %T, i8** %T.Strategy)
// CHECK:   ret void

sil @testArchetypeWitnessMethod : $@convention(thin) <T : Strategy> (@in T) -> @out T.GrowthHack {
entry(%ret : $*T.GrowthHack, %self : $*T):
  %m = witness_method $T, #Strategy.disrupt!1 : $@convention(witness_method) <U: Strategy> (@in_guaranteed U) -> @out U.GrowthHack
  %z = apply %m<T, T.GrowthHack>(%ret, %self) : $@convention(witness_method) <U: Strategy> (@in_guaranteed U) -> @out U.GrowthHack
  return %z : $()
}