// RUN: %target-sil-opt -enable-sil-verify-all %s -devirtualizer | %FileCheck %s

sil_stage canonical

import Builtin
import Swift
import SwiftShims

class K {
  func ping() -> Int
  private func pong() -> Int
  deinit
  init()
}

//CHECK-LABEL: _TFC4test1K4pingfS0_FT_Si
//CHECK: function_ref @_TFC4test1K4pongfS0_FT_Si
//CHECK-NEXT: apply
//CHECK-NEXT: return
sil @_TFC4test1K4pingfS0_FT_Si : $@convention(method) (@guaranteed K) -> Int {
bb0(%0 : $K):
  %1 = class_method %0 : $K, #K.pong : (K) -> () -> Int, $@convention(method) (@guaranteed K) -> Int // user: %2
  %2 = apply %1(%0) : $@convention(method) (@guaranteed K) -> Int // user: %3
  return %2 : $Int                                // id: %3
}

sil @_TFC5test21K4pongfS0_FT_Si : $@convention(method) (@guaranteed K) -> Int
sil @_TFC4test1K4pongfS0_FT_Si : $@convention(method) (@guaranteed K) -> Int
sil @_TFC4test1Kd : $@convention(method) (@guaranteed K) -> @owned Builtin.NativeObject
sil @_TFC4test1KD : $@convention(method) (@guaranteed K) -> ()
sil @_TFC4test1KcfMS0_FT_S0_ : $@convention(method) (@owned K) -> @owned K
sil @_TFC4test1KCfMS0_FT_S0_ : $@convention(thin) (@thick K.Type) -> @owned K

sil_vtable K {
  #K.ping: @_TFC4test1K4pingfS0_FT_Si	// test.K.ping (test.K)() -> Swift.Int
  #K.pong: @_TFC4test1K4pongfS0_FT_Si	// test.K.pong (test.K)() -> Swift.Int
  #K.init!initializer: @_TFC4test1KcfMS0_FT_S0_	// test.K.init (test.K.Type)() -> test.K
}


class X
{
  private func ping() -> Int
  deinit
  init()
}

class Y : X
{
  deinit
  override init()
}

class A
{
  private func ping() -> Int
  deinit
  init()
}

class B : A
{
  override func ping() -> Int
  deinit
  override init()
}

sil @_TFC14devirt_access21X4pingfS0_FT_Si : $@convention(method) (@guaranteed X) -> Int
sil public_external [transparent] @_TFSi33_convertFromBuiltinIntegerLiteralfMSiFBI_Si : $@convention(thin) (Builtin.IntLiteral, @thin Int.Type) -> Int
sil @_TFC14devirt_access21Xd : $@convention(method) (@guaranteed X) -> @owned Builtin.NativeObject
sil @_TFC14devirt_access21XD : $@convention(method) (@guaranteed X) -> ()
sil @_TFC14devirt_access21XcfMS0_FT_S0_ : $@convention(method) (@owned X) -> @owned X
sil @_TFC14devirt_access21XCfMS0_FT_S0_ : $@convention(thin) (@thick X.Type) -> @owned X
sil @_TFC14devirt_access21Yd : $@convention(method) (@guaranteed Y) -> @owned Builtin.NativeObject
sil @_TFC14devirt_access21YD : $@convention(method) (@guaranteed Y) -> ()
sil @_TFC14devirt_access21YcfMS0_FT_S0_ : $@convention(method) (@owned Y) -> @owned Y
sil @_TFC14devirt_access21YCfMS0_FT_S0_ : $@convention(thin) (@thick Y.Type) -> @owned Y
sil @_TFC14devirt_access21A4pingfS0_FT_Si : $@convention(method) (@guaranteed A) -> Int
sil @_TFC14devirt_access21Ad : $@convention(method) (@guaranteed A) -> @owned Builtin.NativeObject
sil @_TFC14devirt_access21AD : $@convention(method) (@guaranteed A) -> ()
sil @_TFC14devirt_access21AcfMS0_FT_S0_ : $@convention(method) (@owned A) -> @owned A
sil @_TFC14devirt_access21ACfMS0_FT_S0_ : $@convention(thin) (@thick A.Type) -> @owned A
sil @_TFC14devirt_access21B4pingfS0_FT_Si : $@convention(method) (@guaranteed B) -> Int
sil @_TFC14devirt_access21Bd : $@convention(method) (@guaranteed B) -> @owned Builtin.NativeObject
sil @_TFC14devirt_access21BD : $@convention(method) (@guaranteed B) -> ()
sil @_TFC14devirt_access21BcfMS0_FT_S0_ : $@convention(method) (@owned B) -> @owned B
sil @_TFC14devirt_access21BCfMS0_FT_S0_ : $@convention(thin) (@thick B.Type) -> @owned B

//CHECK-LABEL: sil @Case1
//CHECK: function_ref @_TFC14devirt_access21X4pingfS0_FT_Si
//CHECK-NEXT: apply
//CHECK: return
sil @Case1 : $@convention(thin) (@owned X) -> Int {
bb0(%0 : $X):
  debug_value %0 : $X, let, name "a" // id: %1
  strong_retain %0 : $X                           // id: %2
  %3 = class_method %0 : $X, #X.ping : (X) -> () -> Int, $@convention(method) (@guaranteed X) -> Int // user: %4
  %4 = apply %3(%0) : $@convention(method) (@guaranteed X) -> Int // user: %6
  strong_release %0 : $X                          // id: %5
  return %4 : $Int                                // id: %6
}

//CHECK-LABEL: sil @Case2
//CHECK: function_ref @_TFC14devirt_access21X4pingfS0_FT_Si
// Y is an internal class, it has no subclasses and it is a wmo compilation,
// therefore ping method invocation can be devirtualized.
//CHECK-NOT: class_method
//CHECK: apply
//CHECK-NOT: class_method
//CHECK: return
sil @Case2 : $@convention(thin) (@owned Y) -> Int {
bb0(%0 : $Y):
  debug_value %0 : $Y, let, name "a" // id: %1
  strong_retain %0 : $Y                           // id: %2
  %3 = upcast %0 : $Y to $X                       // users: %4, %5
  %4 = class_method %3 : $X, #X.ping : (X) -> () -> Int, $@convention(method) (@guaranteed X) -> Int // user: %5
  %5 = apply %4(%3) : $@convention(method) (@guaranteed X) -> Int // user: %7
  strong_release %0 : $Y                          // id: %6
  return %5 : $Int                                // id: %7
}

//CHECK-LABEL: sil @Case3
//CHECK: class_method
//CHECK: return
sil @Case3 : $@convention(thin) (@owned A) -> Int {
bb0(%0 : $A):
  debug_value %0 : $A, let, name "a" // id: %1
  strong_retain %0 : $A                           // id: %2
  %3 = class_method %0 : $A, #A.ping : (A) -> () -> Int, $@convention(method) (@guaranteed A) -> Int // user: %4
  %4 = apply %3(%0) : $@convention(method) (@guaranteed A) -> Int // user: %6
  strong_release %0 : $A                          // id: %5
  return %4 : $Int                                // id: %6
}

//CHECK-LABEL: sil @Case4
//CHECK: class_method
//CHECK: return
sil @Case4 : $@convention(thin) (@owned B) -> Int {
bb0(%0 : $B):
  debug_value %0 : $B, let, name "a" // id: %1
  strong_retain %0 : $B                           // id: %2
  %3 = class_method %0 : $B, #B.ping : (B) -> () -> Int, $@convention(method) (@guaranteed B) -> Int // user: %4
  %4 = apply %3(%0) : $@convention(method) (@guaranteed B) -> Int // user: %6
  strong_release %0 : $B                          // id: %5
  return %4 : $Int                                // id: %6
}

sil_vtable X {
  #X.ping: @_TFC14devirt_access21X4pingfS0_FT_Si	// devirt_access2.X.ping (devirt_access2.X)() -> Swift.Int
  #X.init!initializer: @_TFC14devirt_access21XcfMS0_FT_S0_	// devirt_access2.X.init (devirt_access2.X.Type)() -> devirt_access2.X
}

sil_vtable Y {
  #X.ping: @_TFC14devirt_access21X4pingfS0_FT_Si [inherited]
  #X.init!initializer: @_TFC14devirt_access21YcfMS0_FT_S0_ [override]
}

sil_vtable A {
  #A.ping: @_TFC14devirt_access21A4pingfS0_FT_Si	// devirt_access2.A.ping (devirt_access2.A)() -> Swift.Int
  #A.init!initializer: @_TFC14devirt_access21AcfMS0_FT_S0_	// devirt_access2.A.init (devirt_access2.A.Type)() -> devirt_access2.A
}

sil_vtable B {
  #A.ping: @_TFC14devirt_access21B4pingfS0_FT_Si [override]
  #A.init!initializer: @_TFC14devirt_access21BcfMS0_FT_S0_ [override]
}