expressions.swift

// RUN: rm -rf %t
// RUN: mkdir %t
// RUN: echo "public var x = Int()" | %target-swift-frontend -module-name FooBar -emit-module -o %t -
// RUN: %target-swift-frontend -parse-stdlib -emit-silgen %s -I%t -disable-access-control | FileCheck %s

import Swift
import FooBar

struct SillyString : _BuiltinStringLiteralConvertible, StringLiteralConvertible {
  init(_builtinUnicodeScalarLiteral value: Builtin.Int32) {}

  init(unicodeScalarLiteral value: SillyString) { }

  init(
    _builtinExtendedGraphemeClusterLiteral start: Builtin.RawPointer,
    byteSize: Builtin.Word,
    isASCII: Builtin.Int1
  ) { 
  }

  init(extendedGraphemeClusterLiteral value: SillyString) { }

  init(
    _builtinStringLiteral start: Builtin.RawPointer,
    byteSize: Builtin.Word,
    isASCII: Builtin.Int1) { 
  }

  init(stringLiteral value: SillyString) { }
}

struct SillyUTF16String : _BuiltinUTF16StringLiteralConvertible, StringLiteralConvertible {
  init(_builtinUnicodeScalarLiteral value: Builtin.Int32) { }

  init(unicodeScalarLiteral value: SillyString) { }

  init(
    _builtinExtendedGraphemeClusterLiteral start: Builtin.RawPointer,
    byteSize: Builtin.Word,
    isASCII: Builtin.Int1
  ) { 
  }

  init(extendedGraphemeClusterLiteral value: SillyString) { }

  init(
    _builtinStringLiteral start: Builtin.RawPointer,
    byteSize: Builtin.Word,
    isASCII: Builtin.Int1
  ) { }

  init(
    _builtinUTF16StringLiteral start: Builtin.RawPointer,
    numberOfCodeUnits: Builtin.Word
  ) { 
  }

  init(stringLiteral value: SillyUTF16String) { }
}

func literals() {
  var a = 1
  var b = 1.25
  var d = "foö"
  var e:SillyString = "foo"
}
// CHECK-LABEL: sil hidden @_TF11expressions8literalsFT_T_
// CHECK: integer_literal $Builtin.Int2048, 1
// CHECK: float_literal $Builtin.FPIEEE{{64|80}}, {{0x3FF4000000000000|0x3FFFA000000000000000}}
// CHECK: string_literal utf16 "foö"
// CHECK: string_literal utf8 "foo"

func bar(x: Int) {}
func bar(x: Int, _ y: Int) {}

func call_one() {
  bar(42);
}

// CHECK-LABEL: sil hidden @_TF11expressions8call_oneFT_T_
// CHECK: [[BAR:%[0-9]+]] = function_ref @_TF11expressions3bar{{.*}} : $@convention(thin) (Int) -> ()
// CHECK: [[FORTYTWO:%[0-9]+]] = integer_literal {{.*}} 42
// CHECK: [[FORTYTWO_CONVERTED:%[0-9]+]] = apply {{.*}}([[FORTYTWO]], {{.*}})
// CHECK: apply [[BAR]]([[FORTYTWO_CONVERTED]])

func call_two() {
  bar(42, 219)
}

// CHECK-LABEL: sil hidden @_TF11expressions8call_twoFT_T_
// CHECK: [[BAR:%[0-9]+]] = function_ref @_TF11expressions3bar{{.*}} : $@convention(thin) (Int, Int) -> ()
// CHECK: [[FORTYTWO:%[0-9]+]] = integer_literal {{.*}} 42
// CHECK: [[FORTYTWO_CONVERTED:%[0-9]+]] = apply {{.*}}([[FORTYTWO]], {{.*}})
// CHECK: [[TWONINETEEN:%[0-9]+]] = integer_literal {{.*}} 219
// CHECK: [[TWONINETEEN_CONVERTED:%[0-9]+]] = apply {{.*}}([[TWONINETEEN]], {{.*}})
// CHECK: apply [[BAR]]([[FORTYTWO_CONVERTED]], [[TWONINETEEN_CONVERTED]])

func tuples() {
  bar((4, 5).1)

  var T1 : (a: Int16, b: Int) = (b : 42, a : 777)
}

// CHECK-LABEL: sil hidden @_TF11expressions6tuplesFT_T_


class C {
  var chi:Int
  init() {
    chi = 219
  }
  init(x:Int) {
    chi = x
  }
}

// CHECK-LABEL: sil hidden @_TF11expressions7classesFT_T_
func classes() {
  // CHECK: function_ref @_TFC11expressions1CC{{.*}} : $@convention(thin) (@thick C.Type) -> @owned C
  var a = C()
  // CHECK: function_ref @_TFC11expressions1CC{{.*}} : $@convention(thin) (Int, @thick C.Type) -> @owned C
  var b = C(x: 0)
}

struct S {
  var x:Int
  init() {
    x = 219
  }
  init(x: Int) {
    self.x = x
  }
}

// CHECK-LABEL: sil hidden @_TF11expressions7structsFT_T_
func structs() {
  // CHECK: function_ref @_TFV11expressions1SC{{.*}} : $@convention(thin) (@thin S.Type) -> S
  var a = S()
  // CHECK: function_ref @_TFV11expressions1SC{{.*}} : $@convention(thin) (Int, @thin S.Type) -> S
  var b = S(x: 0)
}


func inoutcallee(inout x: Int) {}
func address_of_expr() {
  var x: Int = 4
  inoutcallee(&x)
}



func identity<T>(x: T) -> T {}

struct SomeStruct {
 mutating
  func a() {}
}

// CHECK-LABEL: sil hidden @_TF11expressions5callsFT_T_
// CHECK: [[METHOD:%[0-9]+]] = function_ref @_TFV11expressions10SomeStruct1a{{.*}} : $@convention(method) (@inout SomeStruct) -> ()
// CHECK: apply [[METHOD]]({{.*}})
func calls() {
  var a : SomeStruct
  a.a()
}

// CHECK-LABEL: sil hidden @_TF11expressions11module_path
func module_path() -> Int {
  return FooBar.x
  // CHECK: [[x_GET:%[0-9]+]] = function_ref @_TF6FooBarau1xSi
  // CHECK-NEXT: apply [[x_GET]]()
}

func default_args(x: Int, y: Int = 219, z: Int = 20721) {}

// CHECK-LABEL: sil hidden @_TF11expressions19call_default_args_1
func call_default_args_1(x: Int) {
  default_args(x)
  // CHECK: [[FUNC:%[0-9]+]] = function_ref @_TF11expressions12default_args
  // CHECK: [[YFUNC:%[0-9]+]] = function_ref @_TIF11expressions12default_args
  // CHECK: [[Y:%[0-9]+]] = apply [[YFUNC]]()
  // CHECK: [[ZFUNC:%[0-9]+]] = function_ref @_TIF11expressions12default_args
  // CHECK: [[Z:%[0-9]+]] = apply [[ZFUNC]]()
  // CHECK: apply [[FUNC]]({{.*}}, [[Y]], [[Z]])
}

// CHECK-LABEL: sil hidden @_TF11expressions19call_default_args_2
func call_default_args_2(x: Int, z: Int) {
  default_args(x, z:z)
  // CHECK: [[FUNC:%[0-9]+]] = function_ref @_TF11expressions12default_args
  // CHECK: [[DEFFN:%[0-9]+]] = function_ref @_TIF11expressions12default_args
  // CHECK-NEXT: [[C219:%[0-9]+]] = apply [[DEFFN]]()
  // CHECK: apply [[FUNC]]({{.*}}, [[C219]], {{.*}})
}

struct Generic<T> {
  var mono_member:Int
  var typevar_member:T

  // CHECK-LABEL: sil hidden @_TFV11expressions7Generic13type_variable
  mutating
  func type_variable() -> T.Type {
    return T.self
    // CHECK: [[METATYPE:%[0-9]+]] = metatype $@thick T.Type
    // CHECK: return [[METATYPE]]
  }

  // CHECK-LABEL: sil hidden @_TFV11expressions7Generic19copy_typevar_member
  mutating
  func copy_typevar_member(x: Generic<T>) {
    typevar_member = x.typevar_member
  }

  // CHECK-LABEL: sil hidden @_TZFV11expressions7Generic12class_method
  static func class_method() {}
}

// CHECK-LABEL: sil hidden @_TF11expressions18generic_member_ref
func generic_member_ref<T>(x: Generic<T>) -> Int {
  // CHECK: bb0([[XADDR:%[0-9]+]] : $*Generic<T>):
  return x.mono_member
  // CHECK: [[MEMBER_ADDR:%[0-9]+]] = struct_element_addr {{.*}}, #Generic.mono_member
  // CHECK: load [[MEMBER_ADDR]]
}

// CHECK-LABEL: sil hidden @_TF11expressions24bound_generic_member_ref
func bound_generic_member_ref(x: Generic<UnicodeScalar>) -> Int {
  var x = x
  // CHECK: bb0([[XADDR:%[0-9]+]] : $Generic<UnicodeScalar>):
  return x.mono_member
  // CHECK: [[MEMBER_ADDR:%[0-9]+]] = struct_element_addr {{.*}}, #Generic.mono_member
  // CHECK: load [[MEMBER_ADDR]]
}

// CHECK-LABEL: sil hidden @_TF11expressions6coerce
func coerce(x: Int32) -> Int64 {
  return 0
}

class B {
}

class D : B {
}

// CHECK-LABEL: sil hidden @_TF11expressions8downcast
func downcast(x: B) -> D {
  return x as! D
  // CHECK: unconditional_checked_cast %{{[0-9]+}} : {{.*}} to $D
}

// CHECK-LABEL: sil hidden @_TF11expressions6upcast
func upcast(x: D) -> B {
  return x
  // CHECK: upcast %{{[0-9]+}} : ${{.*}} to $B
}

// CHECK-LABEL: sil hidden @_TF11expressions14generic_upcast
func generic_upcast<T : B>(x: T) -> B {
  return x
  // CHECK: upcast %{{.*}} to $B
  // CHECK: return
}

// CHECK-LABEL: sil hidden @_TF11expressions16generic_downcast
func generic_downcast<T : B>(x: T, y: B) -> T {
  return y as! T
  // CHECK: unconditional_checked_cast %{{[0-9]+}} : {{.*}} to $T
  // CHECK: return
}

// TODO: generic_downcast

// CHECK-LABEL: sil hidden @_TF11expressions15metatype_upcast
func metatype_upcast() -> B.Type {
  return D.self
  // CHECK: metatype $@thick D
  // CHECK-NEXT: upcast
}

// CHECK-LABEL: sil hidden @_TF11expressions19interpolated_string
func interpolated_string(x: Int, y: String) -> String {
  return "The \(x) Million Dollar \(y)"
}

protocol Runcible {
  typealias U
  var free:Int { get }
  var associated:U { get }

  func free_method() -> Int
  mutating func associated_method() -> U.Type
  static func static_method()
}

protocol Mincible {
  var free:Int { get }
  func free_method() -> Int
  static func static_method()
}

protocol Bendable { }
protocol Wibbleable { }

// CHECK-LABEL: sil hidden @_TF11expressions20archetype_member_ref
func archetype_member_ref<T : Runcible>(x: T) {
  var x = x
  x.free_method()
  // CHECK: witness_method $T, #Runcible.free_method!1
  // CHECK-NEXT: [[TEMP:%.*]] = alloc_stack $T
  // CHECK-NEXT: copy_addr [[X:%.*]] to [initialization] [[TEMP]]#1
  // CHECK-NEXT: apply
  // CHECK-NEXT: destroy_addr [[TEMP]]#1
  var u = x.associated_method()
  // CHECK: witness_method $T, #Runcible.associated_method!1
  // CHECK-NEXT: apply
  T.static_method()
  // CHECK: witness_method $T, #Runcible.static_method!1
  // CHECK-NEXT: metatype $@thick T.Type
  // CHECK-NEXT: apply
}

// CHECK-LABEL: sil hidden @_TF11expressions22existential_member_ref
func existential_member_ref(x: Mincible) {
  x.free_method()
  // CHECK: open_existential_addr
  // CHECK-NEXT: witness_method
  // CHECK-NEXT: apply
}

/*TODO archetype and existential properties and subscripts
func archetype_property_ref<T : Runcible>(x: T) -> (Int, T.U) {
  x.free = x.free_method()
  x.associated = x.associated_method()
  return (x.free, x.associated)
}

func existential_property_ref<T : Runcible>(x: T) -> Int {
  x.free = x.free_method()
  return x.free
}

also archetype/existential subscripts
*/

struct Spoon : Runcible, Mincible {
  typealias U = Float
  var free: Int { return 4 }
  var associated: Float { return 12 }

  func free_method() -> Int {}
  func associated_method() -> Float.Type {}
  static func static_method() {}
}

struct Hat<T> : Runcible {
  typealias U = [T]
  var free: Int { return 1 }
  var associated: U { get {} }

  func free_method() -> Int {}

  // CHECK-LABEL: sil hidden @_TFV11expressions3Hat17associated_method
  mutating
  func associated_method() -> U.Type {
    return U.self
    // CHECK: [[META:%[0-9]+]] = metatype $@thin Array<T>.Type
    // CHECK: return [[META]]
  }

  static func static_method() {}
}

// CHECK-LABEL: sil hidden @_TF11expressions7erasure
func erasure(x: Spoon) -> Mincible {
  return x
  // CHECK: init_existential_addr
  // CHECK: return
}

// CHECK-LABEL: sil hidden @_TF11expressions19declref_to_metatypeFT_MVS_5Spoon
func declref_to_metatype() -> Spoon.Type {
  return Spoon.self
  // CHECK: metatype $@thin Spoon.Type
}

// CHECK-LABEL: sil hidden @_TF11expressions27declref_to_generic_metatype
func declref_to_generic_metatype() -> Generic<UnicodeScalar>.Type {
  // FIXME parsing of T<U> in expression context
  typealias GenericChar = Generic<UnicodeScalar>
  return GenericChar.self
  // CHECK: metatype $@thin Generic<UnicodeScalar>.Type
}

func int(x: Int) {}
func float(x: Float) {}

func tuple() -> (Int, Float) { return (1, 1.0) }

// CHECK-LABEL: sil hidden @_TF11expressions13tuple_element
func tuple_element(x: (Int, Float)) {
  var x = x
  // CHECK: [[XADDR:%.*]] = alloc_box $(Int, Float)

  int(x.0)
  // CHECK: tuple_element_addr [[XADDR]]#1 : {{.*}}, 0
  // CHECK: apply

  float(x.1)
  // CHECK: tuple_element_addr [[XADDR]]#1 : {{.*}}, 1
  // CHECK: apply

  int(tuple().0)
  // CHECK: [[ZERO:%.*]] = tuple_extract {{%.*}} : {{.*}}, 0
  // CHECK: apply {{.*}}([[ZERO]])

  float(tuple().1)
  // CHECK: [[ONE:%.*]] = tuple_extract {{%.*}} : {{.*}}, 1
  // CHECK: apply {{.*}}([[ONE]])
}

// CHECK-LABEL: sil hidden @_TF11expressions10containers
func containers() -> ([Int], Dictionary<String, Int>) {
  return ([1, 2, 3], ["Ankeny": 1, "Burnside": 2, "Couch": 3])
}

// CHECK-LABEL: sil hidden @_TF11expressions7if_expr
func if_expr(a: Bool, b: Bool, x: Int, y: Int, z : Int) -> Int {
  var a = a
  var b = b
  var x = x
  var y = y
  var z = z
  // CHECK: bb0({{.*}}):
  // CHECK: [[AB:%[0-9]+]] = alloc_box $Bool
  // CHECK: [[BB:%[0-9]+]] = alloc_box $Bool
  // CHECK: [[XB:%[0-9]+]] = alloc_box $Int
  // CHECK: [[YB:%[0-9]+]] = alloc_box $Int
  // CHECK: [[ZB:%[0-9]+]] = alloc_box $Int

  return a
    ? x
    : b
    ? y
    : z
  // CHECK:   [[A:%[0-9]+]] = load [[AB]]#1
  // CHECK:   [[ACOND:%[0-9]+]] = apply {{.*}}([[A]])
  // CHECK:   cond_br [[ACOND]], [[IF_A:bb[0-9]+]], [[ELSE_A:bb[0-9]+]]
  // CHECK: [[IF_A]]:
  // CHECK:   [[XVAL:%[0-9]+]] = load [[XB]]
  // CHECK:   br [[CONT_A:bb[0-9]+]]([[XVAL]] : $Int)
  // CHECK: [[ELSE_A]]:
  // CHECK:   [[B:%[0-9]+]] = load [[BB]]#1
  // CHECK:   [[BCOND:%[0-9]+]] = apply {{.*}}([[B]])
  // CHECK:   cond_br [[BCOND]], [[IF_B:bb[0-9]+]], [[ELSE_B:bb[0-9]+]]
  // CHECK: [[IF_B]]:
  // CHECK:   [[YVAL:%[0-9]+]] = load [[YB]]
  // CHECK:   br [[CONT_B:bb[0-9]+]]([[YVAL]] : $Int)
  // CHECK: [[ELSE_B]]:
  // CHECK:   [[ZVAL:%[0-9]+]] = load [[ZB]]
  // CHECK:   br [[CONT_B:bb[0-9]+]]([[ZVAL]] : $Int)
  // CHECK: [[CONT_B]]([[B_RES:%[0-9]+]] : $Int):
  // CHECK:   br [[CONT_A:bb[0-9]+]]([[B_RES]] : $Int)
  // CHECK: [[CONT_A]]([[A_RES:%[0-9]+]] : $Int):
  // CHECK:   return [[A_RES]]
}


// Test that magic identifiers expand properly.  We test __COLUMN__ here because
// it isn't affected as this testcase slides up and down the file over time.
func magic_identifier_expansion(a: Int = __COLUMN__) {
  // CHECK-LABEL: sil hidden @{{.*}}magic_identifier_expansion
  
  // This should expand to the column number of the first _.
  var tmp = __COLUMN__
  // CHECK: integer_literal $Builtin.Int2048, 13

  // This should expand to the column number of the (, not to the column number
  // of __COLUMN__ in the default argument list of this function.
  // rdar://14315674
  magic_identifier_expansion()
  // CHECK: integer_literal $Builtin.Int2048, 29
}

func print_string() {
  // CHECK-LABEL: print_string
  var str = "\u{08}\u{09}\thello\r\n\0wörld\u{1e}\u{7f}"
  // CHECK: string_literal utf16 "\u{08}\t\thello\r\n\0wörld\u{1E}\u{7F}"
}



// Test that we can silgen superclass calls that go farther than the immediate
// superclass.
class Super1 {
  func funge() {}
}
class Super2 : Super1 {}
class Super3 : Super2 {
  override func funge() {
    super.funge()
  }
}

// <rdar://problem/16880240> SILGen crash assigning to _
func testDiscardLValue() {
  var a = 42
  _ = a
}


func dynamicTypePlusZero(a : Super1) -> Super1.Type {
  return a.dynamicType
}
// CHECK-LABEL: dynamicTypePlusZero
// CHECK: bb0(%0 : $Super1):
// CHECK-NOT: retain
// CHECK: value_metatype  $@thick Super1.Type, %0 : $Super1

struct NonTrivialStruct { var c : Super1 }

func dontEmitIgnoredLoadExpr(a : NonTrivialStruct) -> NonTrivialStruct.Type {
  return a.dynamicType
}
// CHECK-LABEL: dontEmitIgnoredLoadExpr
// CHECK: bb0(%0 : $NonTrivialStruct):
// CHECK-NEXT: debug_value
// CHECK-NEXT: %2 = metatype $@thin NonTrivialStruct.Type
// CHECK-NEXT: release_value %0
// CHECK-NEXT: return %2 : $@thin NonTrivialStruct.Type


// <rdar://problem/18851497> Swiftc fails to compile nested destructuring tuple binding
// CHECK-LABEL: sil hidden @_TF11expressions21implodeRecursiveTupleFGSqTTSiSi_Si__T_
// CHECK: bb0(%0 : $Optional<((Int, Int), Int)>):
func implodeRecursiveTuple(expr: ((Int, Int), Int)?) {

  // CHECK:      [[WHOLE:%[0-9]+]] = load {{.*}} : $*((Int, Int), Int)
  // CHECK-NEXT: [[WHOLE0:%[0-9]+]] = tuple_extract [[WHOLE]] : $((Int, Int), Int), 0
  // CHECK-NEXT: [[WHOLE00:%[0-9]+]] = tuple_extract [[WHOLE0]] : $(Int, Int), 0
  // CHECK-NEXT: [[WHOLE01:%[0-9]+]] = tuple_extract [[WHOLE0]] : $(Int, Int), 1
  // CHECK-NEXT: [[WHOLE1:%[0-9]+]] = tuple_extract [[WHOLE]] : $((Int, Int), Int), 1

  // CHECK-NEXT: [[X:%[0-9]+]] = tuple ([[WHOLE00]] : $Int, [[WHOLE01]] : $Int)
  // CHECK-NEXT: debug_value [[X]] : $(Int, Int)  // let x
  // CHECK-NEXT: debug_value [[WHOLE1]] : $Int  // let y

  let (x, y) = expr!
}

func test20087517() {
  class Color {
    static func greenColor() -> Color { return Color() }
  }
  let x: (Color!, Int) = (.greenColor(), 1)
}

func test20596042() {
  enum E {
    case thing1
    case thing2
  }

  func f() -> (E?, Int)? {
    return (.thing1, 1)
  }
}

func test21886435() {
  () = ()
}