test/SILOptimizer/rcidentity.sil

// RUN: %target-sil-opt -rc-id-dumper %s -o /dev/null | %FileCheck %s

import Builtin

///////////////////////
// NonTest Utilities //
///////////////////////

typealias AnyObject = Builtin.AnyObject

protocol FakeAnyObject : class {}

class C : FakeAnyObject {
  init()
}

class D : C {
  override init()
}

class E {
  init()
}

sil @foo : $@convention(thin) (Builtin.Word) -> ()

struct S1 {
  var f1 : Builtin.Word
  var f2 : Builtin.NativeObject
  var f3 : Builtin.NativeObject
}

struct S2 {
  var f1 : Builtin.Word
  var f2 : S1
  var f3 : Builtin.Word
}

struct S3 {
  var f1 : Builtin.Word
  var f2 : Builtin.Word
  var f3 : Builtin.NativeObject
}

struct S4 {
  var f1 : S3
  var f2 : Builtin.Word
  var f5 : Builtin.Word
}

enum E1 {
  case Case1
  case Case2(S1)
  case Case3(Builtin.Word)
}

///////////
// Tests //
///////////

// Make sure that we see all the way through the chain of casts that %9 has an RCIdentity of %0 and that %12 is really the partial apply.
// CHECK-LABEL: @test_rcid_preserving_casts@
// CHECK: RESULT #9: 9 = 0
// CHECK: RESULT #12: 12 = 11
sil @test_rcid_preserving_casts : $@convention(thin) (Builtin.NativeObject) -> () {
bb0(%0 : $Builtin.NativeObject):
  %1 = unconditional_checked_cast %0 : $Builtin.NativeObject to $D
  %2 = upcast %1 : $D to $C
  %3 = unchecked_ref_cast %2 : $C to $E
  %4 = integer_literal $Builtin.Word, 0
  %5 = ref_to_bridge_object %3 : $E, %4 : $Builtin.Word
  %6 = bridge_object_to_ref %5 : $Builtin.BridgeObject to $C
  %7 = init_existential_ref %6 : $C : $C, $FakeAnyObject
  %8 = open_existential_ref %7 : $FakeAnyObject to $@opened("A2E21C52-6089-11E4-9866-3C0754723233") FakeAnyObject
  %9 = unchecked_ref_cast %8 : $@opened("A2E21C52-6089-11E4-9866-3C0754723233") FakeAnyObject to $Builtin.NativeObject
  %10 = function_ref @foo : $@convention(thin) (Builtin.Word) -> ()
  %11 = partial_apply %10(%4) : $@convention(thin) (Builtin.Word) -> ()
  %12 = convert_function %11 : $@callee_owned @convention(thick) () -> () to $@callee_owned @convention(thick) () -> ()
  return undef : $()
}

// Make sure that we look through structs with only one reference counted fields
// and that we do not look through structs without that property.
//
// CHECK-LABEL: @test_single_refcount_field_structs@
// CHECK: RESULT #2: 2 = 0
// CHECK: RESULT #3: 3 = 0
// CHECK: RESULT #4: 4 = 4
// CHECK: RESULT #5: 5 = 4
sil @test_single_refcount_field_structs : $@convention(thin) (Builtin.NativeObject, Builtin.Word) -> () {
bb0(%0 : $Builtin.NativeObject, %1 : $Builtin.Word):
  %2 = struct $S3(%1 : $Builtin.Word, %1 : $Builtin.Word, %0 : $Builtin.NativeObject)
  %3 = struct $S4(%2 : $S3, %1 : $Builtin.Word, %1 : $Builtin.Word)

  %4 = struct $S1(%1 : $Builtin.Word, %0 : $Builtin.NativeObject, %0 : $Builtin.NativeObject)
  %5 = struct $S2(%1 : $Builtin.Word, %4 : $S1, %1 : $Builtin.Word)
  return undef : $()
}

// CHECK-LABEL: @test_single_refcount_field_tuples@
// CHECK: RESULT #2: 2 = 0
// CHECK: RESULT #3: 3 = 0
// CHECK: RESULT #4: 4 = 4
// CHECK: RESULT #5: 5 = 4
sil @test_single_refcount_field_tuples : $@convention(thin) (Builtin.NativeObject, Builtin.Word) -> () {
bb0(%0 : $Builtin.NativeObject, %1 : $Builtin.Word):
  %2 = tuple(%1 : $Builtin.Word, %1 : $Builtin.Word, %0 : $Builtin.NativeObject)
  %3 = tuple(%2 : $(Builtin.Word, Builtin.Word, Builtin.NativeObject), %1 : $Builtin.Word, %1 : $Builtin.Word)
  %4 = tuple(%1 : $Builtin.Word, %0 : $Builtin.NativeObject, %0 : $Builtin.NativeObject)
  %5 = tuple(%1 : $Builtin.Word, %4 : $(Builtin.Word, Builtin.NativeObject, Builtin.NativeObject), %1 : $Builtin.Word)
  return undef : $()
}

// All of the SSA values in the given function besides %6 can be resolved to
// (%0, %1). Because %6 has multiple SSA values and there is nothing tricky we
// can do here, just bail.
//
// CHECK-LABEL: @test_single_pred_rc_id@
// CHECK: RESULT #0: 0 = 0
// CHECK: RESULT #1: 1 = 1
// CHECK: RESULT #2: 2 = 0
// CHECK: RESULT #3: 3 = 1
// CHECK: RESULT #4: 4 = 1
// CHECK: RESULT #5: 5 = 0
// CHECK: RESULT #6: 6 = 6
sil @test_single_pred_rc_id : $@convention(thin) (Builtin.NativeObject, Builtin.NativeObject) -> () {
bb0(%0 : $Builtin.NativeObject, %1 : $Builtin.NativeObject):
  br bb1(%0 : $Builtin.NativeObject, %1 : $Builtin.NativeObject)

bb1(%2 : $Builtin.NativeObject, %3 : $Builtin.NativeObject):
  cond_br undef, bb2(%3 : $Builtin.NativeObject), bb3(%2 : $Builtin.NativeObject)

bb2(%4 : $Builtin.NativeObject):
  br bb4(%4 : $Builtin.NativeObject)

bb3(%5 : $Builtin.NativeObject):
  br bb4(%5 : $Builtin.NativeObject)

bb4(%6 : $Builtin.NativeObject):
  cond_br undef, bb4(%6 : $Builtin.NativeObject), bb5

bb5:
  return undef : $()
}

// All of the SSA values in the given function can be resolved to %0.
//
// CHECK-LABEL: @test_multiple_pred_same_rcid@
// CHECK: RESULT #0: 0 = 0
// CHECK: RESULT #1: 1 = 0
// CHECK: RESULT #2: 2 = 0
// CHECK: RESULT #3: 3 = 0
// CHECK: RESULT #4: 4 = 0
// CHECK: RESULT #5: 5 = 0
sil @test_multiple_pred_same_rcid : $@convention(thin) (Builtin.NativeObject) -> () {
bb0(%0 : $Builtin.NativeObject):
  br bb1(%0 : $Builtin.NativeObject, %0 : $Builtin.NativeObject)

bb1(%2 : $Builtin.NativeObject, %3 : $Builtin.NativeObject):
  cond_br undef, bb2(%3 : $Builtin.NativeObject), bb3(%2 : $Builtin.NativeObject)

bb2(%4 : $Builtin.NativeObject):
  br bb4(%4 : $Builtin.NativeObject)

bb3(%5 : $Builtin.NativeObject):
  br bb4(%5 : $Builtin.NativeObject)

bb4(%6 : $Builtin.NativeObject):
  br bb5

bb5:
  return undef : $()
}