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

sil_stage canonical

import Builtin
import Swift

class Bar {
  init()
  func ping()
}

class Foo : Bar {
  override init()
  override func ping()
}

sil_global @x : $Bar

// CHECK-LABEL: sil @function_with_cm_with_cast
// CHECK: [[SELF:%.*]] = alloc_ref $Foo
// CHECK: [[CAST_1_SELF:%.*]] = upcast [[SELF]]
// CHECK: [[CAST_2_SELF:%.*]] = unconditional_checked_cast [[CAST_1_SELF]]
// CHECK: [[CAST_3_SELF:%.*]] = upcast [[CAST_2_SELF]]
// CHECK: store [[CAST_3_SELF]] to [[GLOBAL:%.*]] :
// CHECK-NEXT: [[RELOADED_SELF:%.*]] = load [[GLOBAL]]
// CHECK-NOT: class_method
// CHECK: [[REF:%.*]] = function_ref @_TFC4main3Foo4pingfS0_FT_T_
// CHECK: [[SELF:%.*]] = unchecked_ref_cast [[RELOADED_SELF]]
// CHECK: apply [[REF]]([[SELF]])
// CHECK: return
sil @function_with_cm_with_cast : $@convention(thin) () -> () {
bb0:
  %0 = global_addr @x : $*Bar                     // users: %7, %8
  %1 = alloc_ref $Foo                             // users: %5, %3, %2
  strong_retain %1 : $Foo                         // id: %2
  %3 = upcast %1 : $Foo to $Bar                   // user: %4
  %4 = unconditional_checked_cast %3 : $Bar to $Foo // user: %6
  strong_release %1 : $Foo                        // id: %5
  %6 = upcast %4 : $Foo to $Bar                   // user: %7
  store %6 to %0 : $*Bar                          // id: %7
  %8 = load %0 : $*Bar                            // users: %11, %10, %9
  strong_retain %6 : $Bar                         // id: %9
  %10 = class_method %6 : $Bar, #Bar.ping!1 : (Bar) -> () -> (), $@convention(method) (@guaranteed Bar) -> () // user: %11
  %11 = apply %10(%8) : $@convention(method) (@guaranteed Bar) -> ()
  %12 = tuple ()                                  // user: %13
  return %12 : $()                                // id: %13
}

// CHECK-LABEL: sil @function_with_cm_with_dynamic_type_known_from_checked_cast_br
// CHECK-NOT: class_method
// CHECK: bb4([[SELF:%.*]] : $Bar):
// CHECK: [[REF:%.*]] = function_ref @_TFC4main3Bar4pingfS0_FT_T_
// CHECK: apply [[REF]]([[SELF]])
// CHECK: return
sil @function_with_cm_with_dynamic_type_known_from_checked_cast_br : $@convention(thin) (Bar) -> () {
bb0(%0 : $Bar):
  checked_cast_br [exact] %0 : $Bar to $Bar, bb1, bb5

bb1(%1 : $Bar):
  br bb2(%1 : $Bar)

bb2(%2 : $Bar):
  br bb3(%2 : $Bar)

bb3(%3 : $Bar):
  br bb4(%3 : $Bar)

bb4(%4 : $Bar):
  // Devirtualizer should be able to figure out that the exact dynamic type of %1 is Bar.
  %5 = class_method %4 : $Bar, #Bar.ping!1 : (Bar) -> () -> (), $@convention(method) (@guaranteed Bar) -> ()
  %6 = apply %5(%4) : $@convention(method) (@guaranteed Bar) -> ()
  br bb6

bb5:
  br bb6

bb6:
  %7 = tuple ()
  return %7 : $()
}

// CHECK-LABEL: sil @function_with_cm_with_dynamic_type_known_from_incoming_bb_args
// CHECK-NOT: class_method
// CHECK: bb3([[SELF:%.*]] : $Bar):
// CHECK: [[REF:%.*]] = function_ref @_TFC4main3Bar4pingfS0_FT_T_
// CHECK: apply [[REF]]([[SELF]])
// CHECK: return
sil @function_with_cm_with_dynamic_type_known_from_incoming_bb_args : $@convention(thin) (Builtin.Int1) -> () {
bb0(%0 : $Builtin.Int1):
  cond_br %0, bb1, bb2

bb1:
  %1 = alloc_ref $Bar
  br bb3(%1 : $Bar)

bb2:
  %2 = alloc_ref $Bar
  br bb3(%2 : $Bar)

bb3(%4 : $Bar):
  // Devirtualizer should be able to figure out that the exact dynamic type of %4 is Bar.
  %5 = class_method %4 : $Bar, #Bar.ping!1 : (Bar) -> () -> (), $@convention(method) (@guaranteed Bar) -> ()
  %6 = apply %5(%4) : $@convention(method) (@guaranteed Bar) -> ()
  br bb4

bb4:
  strong_release %4 : $Bar
  %7 = tuple ()
  return %7 : $()
}


sil @_TFC4main3Bar4pingfS0_FT_T_ : $@convention(method) (@guaranteed Bar) -> ()
sil @_TFC4main3Foo4pingfS0_FT_T_ : $@convention(method) (@guaranteed Foo) -> ()

sil_vtable Bar {
  #Bar.ping!1: @_TFC4main3Bar4pingfS0_FT_T_
}

sil_vtable Foo {
  #Bar.ping!1: @_TFC4main3Foo4pingfS0_FT_T_
}