test/stdlib/Runtime.swift.gyb

// RUN: %empty-directory(%t)
//
// RUN: %gyb %s -o %t/Runtime.swift
// RUN: %target-build-swift -parse-stdlib -module-name a %t/Runtime.swift -o %t.out
// RUN: %target-codesign %t.out
// RUN: %target-run %t.out
// REQUIRES: executable_test

import Swift
import StdlibUnittest
import SwiftShims

#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
  import Darwin
#elseif os(Linux) || os(FreeBSD) || os(PS4) || os(Android) || os(Cygwin) || os(Haiku)
  import Glibc
#elseif os(Windows)
  import MSVCRT
  import WinSDK
#else
#error("Unsupported platform")
#endif

@_silgen_name("swift_demangle")
public
func _stdlib_demangleImpl(
  mangledName: UnsafePointer<CChar>?,
  mangledNameLength: UInt,
  outputBuffer: UnsafeMutablePointer<CChar>?,
  outputBufferSize: UnsafeMutablePointer<UInt>?,
  flags: UInt32
) -> UnsafeMutablePointer<CChar>?

func _stdlib_demangleName(_ mangledName: String) -> String {
  return mangledName.utf8CString.withUnsafeBufferPointer {
    (mangledNameUTF8CStr) in

    let demangledNamePtr = _stdlib_demangleImpl(
      mangledName: mangledNameUTF8CStr.baseAddress,
      mangledNameLength: UInt(mangledNameUTF8CStr.count - 1),
      outputBuffer: nil,
      outputBufferSize: nil,
      flags: 0)

    if let demangledNamePtr = demangledNamePtr {
      let demangledName = String(cString: demangledNamePtr)
      _swift_stdlib_free(demangledNamePtr)
      return demangledName
    }
    return mangledName
  }
}

var swiftObjectCanaryCount = 0
class SwiftObjectCanary {
  init() {
    swiftObjectCanaryCount += 1
  }
  deinit {
    swiftObjectCanaryCount -= 1
  }
}

struct SwiftObjectCanaryStruct {
  var ref = SwiftObjectCanary()
}

var Runtime = TestSuite("Runtime")

Runtime.test("_canBeClass") {
  expectEqual(1, _canBeClass(SwiftObjectCanary.self))
  expectEqual(0, _canBeClass(SwiftObjectCanaryStruct.self))

  typealias SwiftClosure = () -> ()
  expectEqual(0, _canBeClass(SwiftClosure.self))
}

//===----------------------------------------------------------------------===//

// The protocol should be defined in the standard library, otherwise the cast
// does not work.
typealias P1 = CustomReflectable
typealias P2 = CustomStringConvertible
protocol Q1 {}

extension P1 {
  var success: Bool {
    print(String(describing: customMirror))
    return String(describing: customMirror) == "Mirror for ()"
  }
}

// A small struct that can be stored inline in an opaque buffer.
struct StructConformsToP1 : CustomReflectable, Q1 {
  var customMirror: Mirror {
    return Mirror(reflecting: ())
  }
}

// A small struct that can be stored inline in an opaque buffer.
struct Struct2ConformsToP1<T : CustomReflectable> : CustomReflectable, Q1 {
  init(_ value: T) {
    self.value = value
  }
  var customMirror: Mirror {
    return value.customMirror
  }
  var value: T
}

// A large struct that cannot be stored inline in an opaque buffer.
struct Struct3ConformsToP2 : CustomStringConvertible, Q1 {
  var a: UInt64 = 10
  var b: UInt64 = 20
  var c: UInt64 = 30
  var d: UInt64 = 40

  var description: String {
    // Don't rely on string interpolation, it uses the casts that we are trying
    // to test.
    var result = ""
    result += _uint64ToString(a) + " "
    result += _uint64ToString(b) + " "
    result += _uint64ToString(c) + " "
    result += _uint64ToString(d)
    return result
  }
}

// A large struct that cannot be stored inline in an opaque buffer.
struct Struct4ConformsToP2<T : CustomStringConvertible> : CustomStringConvertible, Q1 {
  var value: T
  var e: UInt64 = 50
  var f: UInt64 = 60
  var g: UInt64 = 70
  var h: UInt64 = 80

  init(_ value: T) {
    self.value = value
  }

  var description: String {
    // Don't rely on string interpolation, it uses the casts that we are trying
    // to test.
    var result = value.description + " "
    result += _uint64ToString(e) + " "
    result += _uint64ToString(f) + " "
    result += _uint64ToString(g) + " "
    result += _uint64ToString(h)
    return result
  }
}

struct StructDoesNotConformToP1 : Q1 {}

class ClassConformsToP1 : CustomReflectable, Q1 {
  var customMirror: Mirror {
    return Mirror(reflecting: ())
  }
}

class Class2ConformsToP1<T : CustomReflectable> : CustomReflectable, Q1 {
  init(_ value: T) {
    self.value = [value]
  }
  var customMirror: Mirror {
    return value[0].customMirror
  }
  // FIXME: should be "var value: T", but we don't support it now.
  var value: Array<T>
}

class ClassDoesNotConformToP1 : Q1 {}

Runtime.test("dynamicCasting with as") {
  let someP1Value = StructConformsToP1()
  let someP1Value2 = Struct2ConformsToP1(StructConformsToP1())
  let someNotP1Value = StructDoesNotConformToP1()
  let someP2Value = Struct3ConformsToP2()
  let someP2Value2 = Struct4ConformsToP2(Struct3ConformsToP2())
  let someP1Ref = ClassConformsToP1()
  let someP1Ref2 = Class2ConformsToP1(ClassConformsToP1())
  let someNotP1Ref = ClassDoesNotConformToP1()

  expectTrue(someP1Value is P1)
  expectTrue(someP1Value2 is P1)
  expectFalse(someNotP1Value is P1)
  expectTrue(someP2Value is P2)
  expectTrue(someP2Value2 is P2)
  expectTrue(someP1Ref is P1)
  expectTrue(someP1Ref2 is P1)
  expectFalse(someNotP1Ref is P1)

  expectTrue(someP1Value as P1 is P1)
  expectTrue(someP1Value2 as P1 is P1)
  expectTrue(someP2Value as P2 is P2)
  expectTrue(someP2Value2 as P2 is P2)
  expectTrue(someP1Ref as P1 is P1)

  expectTrue(someP1Value as Q1 is P1)
  expectTrue(someP1Value2 as Q1 is P1)
  expectFalse(someNotP1Value as Q1 is P1)
  expectTrue(someP2Value as Q1 is P2)
  expectTrue(someP2Value2 as Q1 is P2)
  expectTrue(someP1Ref as Q1 is P1)
  expectTrue(someP1Ref2 as Q1 is P1)
  expectFalse(someNotP1Ref as Q1 is P1)

  expectTrue(someP1Value as Any is P1)
  expectTrue(someP1Value2 as Any is P1)
  expectFalse(someNotP1Value as Any is P1)
  expectTrue(someP2Value as Any is P2)
  expectTrue(someP2Value2 as Any is P2)
  expectTrue(someP1Ref as Any is P1)
  expectTrue(someP1Ref2 as Any is P1)
  expectFalse(someNotP1Ref as Any is P1)

  expectTrue(someP1Ref as AnyObject is P1)
  expectTrue(someP1Ref2 as AnyObject is P1)
  expectFalse(someNotP1Ref as AnyObject is P1)

  expectTrue((someP1Value as P1).success)
  expectTrue((someP1Value2 as P1).success)
  expectEqual("10 20 30 40", (someP2Value as P2).description)
  expectEqual("10 20 30 40 50 60 70 80", (someP2Value2 as P2).description)

  expectTrue((someP1Ref as P1).success)
  expectTrue((someP1Ref2 as P1).success)

  expectTrue(((someP1Value as Q1) as! P1).success)
  expectTrue(((someP1Value2 as Q1) as! P1).success)
  expectEqual("10 20 30 40", ((someP2Value as Q1) as! P2).description)
  expectEqual("10 20 30 40 50 60 70 80",
    ((someP2Value2 as Q1) as! P2).description)
  expectTrue(((someP1Ref as Q1) as! P1).success)
  expectTrue(((someP1Ref2 as Q1) as! P1).success)

  expectTrue(((someP1Value as Any) as! P1).success)
  expectTrue(((someP1Value2 as Any) as! P1).success)
  expectEqual("10 20 30 40", ((someP2Value as Any) as! P2).description)
  expectEqual("10 20 30 40 50 60 70 80",
    ((someP2Value2 as Any) as! P2).description)
  expectTrue(((someP1Ref as Any) as! P1).success)
  expectTrue(((someP1Ref2 as Any) as! P1).success)

  expectTrue(((someP1Ref as AnyObject) as! P1).success)

  expectNil((someNotP1Value as? P1))
  expectNil((someNotP1Ref as? P1))

  expectTrue(((someP1Value as Q1) as? P1)!.success)
  expectTrue(((someP1Value2 as Q1) as? P1)!.success)
  expectNil(((someNotP1Value as Q1) as? P1))
  expectEqual("10 20 30 40", ((someP2Value as Q1) as? P2)!.description)
  expectEqual("10 20 30 40 50 60 70 80",
    ((someP2Value2 as Q1) as? P2)!.description)
  expectTrue(((someP1Ref as Q1) as? P1)!.success)
  expectTrue(((someP1Ref2 as Q1) as? P1)!.success)
  expectNil(((someNotP1Ref as Q1) as? P1))

  expectTrue(((someP1Value as Any) as? P1)!.success)
  expectTrue(((someP1Value2 as Any) as? P1)!.success)
  expectNil(((someNotP1Value as Any) as? P1))
  expectEqual("10 20 30 40", ((someP2Value as Any) as? P2)!.description)
  expectEqual("10 20 30 40 50 60 70 80",
    ((someP2Value2 as Any) as? P2)!.description)
  expectTrue(((someP1Ref as Any) as? P1)!.success)
  expectTrue(((someP1Ref2 as Any) as? P1)!.success)
  expectNil(((someNotP1Ref as Any) as? P1))

  expectTrue(((someP1Ref as AnyObject) as? P1)!.success)
  expectTrue(((someP1Ref2 as AnyObject) as? P1)!.success)
  expectNil(((someNotP1Ref as AnyObject) as? P1))

  let doesThrow: (Int) throws -> Int = { $0 }
  let doesNotThrow: (String) -> String = { $0 }

  _ = doesThrow

  expectTrue(doesThrow as Any is (Int) throws -> Int)
  expectFalse(doesThrow as Any is (String) throws -> Int)
  expectFalse(doesThrow as Any is (String) throws -> String)
  expectFalse(doesThrow as Any is (Int) throws -> String)
  expectFalse(doesThrow as Any is (Int) -> Int)
  expectFalse(doesThrow as Any is (String) throws -> String)
  expectFalse(doesThrow as Any is (String) -> String)
  expectTrue(doesNotThrow as Any is (String) throws -> String)
  expectTrue(doesNotThrow as Any is (String) -> String)
  expectFalse(doesNotThrow as Any is (Int) -> String)
  expectFalse(doesNotThrow as Any is (Int) -> Int)
  expectFalse(doesNotThrow as Any is (String) -> Int)
  expectFalse(doesNotThrow as Any is (Int) throws -> Int)
  expectFalse(doesNotThrow as Any is (Int) -> Int)
}

extension Int {
  class ExtensionClassConformsToP2 : P2 {
    var description: String { return "abc" }
  }

  fileprivate class PrivateExtensionClassConformsToP2 : P2 {
    var description: String { return "def" }
  }
}

Runtime.test("dynamic cast to existential with cross-module extensions") {
  let internalObj = Int.ExtensionClassConformsToP2()
  let privateObj = Int.PrivateExtensionClassConformsToP2()

  expectTrue(internalObj is P2)
  expectTrue(privateObj is P2)
}

class SomeClass {}
struct SomeStruct {}
enum SomeEnum {
  case A
  init() { self = .A }
}

Runtime.test("typeName") {
  expectEqual("a.SomeClass", _typeName(SomeClass.self))
  expectEqual("a.SomeStruct", _typeName(SomeStruct.self))
  expectEqual("a.SomeEnum", _typeName(SomeEnum.self))
  expectEqual("Any.Protocol", _typeName(Any.Protocol.self))
  expectEqual("Swift.AnyObject.Protocol", _typeName(AnyObject.Protocol.self))
  expectEqual("Swift.AnyObject.Type.Protocol", _typeName(AnyClass.Protocol.self))
  expectEqual("Swift.Optional<Swift.AnyObject>.Type", _typeName((AnyObject?).Type.self))

  var a: Any = SomeClass()
  expectEqual("a.SomeClass", _typeName(type(of: a)))

  a = SomeStruct()
  expectEqual("a.SomeStruct", _typeName(type(of: a)))

  a = SomeEnum()
  expectEqual("a.SomeEnum", _typeName(type(of: a)))

  a = AnyObject.self
  expectEqual("Swift.AnyObject.Protocol", _typeName(type(of: a)))

  a = AnyClass.self
  expectEqual("Swift.AnyObject.Type.Protocol", _typeName(type(of: a)))

  a = (AnyObject?).self
  expectEqual("Swift.Optional<Swift.AnyObject>.Type",
    _typeName(type(of: a)))

  a = Any.self
  expectEqual("Any.Protocol", _typeName(type(of: a)))
}

class SomeSubclass : SomeClass {}

protocol SomeProtocol {}
class SomeConformingClass : SomeProtocol {}
class SomeConformingSubclass : SomeConformingClass {}
class UnicodeCläss {}

Runtime.test("typeByName") {
  expectTrue(_typeByName("a.SomeClass") == SomeClass.self)
  expectTrue(_typeByName("a.SomeSubclass") == SomeSubclass.self)
  // name lookup will be via protocol conformance table
  expectTrue(_typeByName("a.SomeConformingClass") == SomeConformingClass.self)
  expectTrue(_typeByName("a.UnicodeCläss") == UnicodeCläss.self)
}

Runtime.test("demangleName") {
  expectEqual("", _stdlib_demangleName(""))
  expectEqual("abc", _stdlib_demangleName("abc"))
  expectEqual("\0", _stdlib_demangleName("\0"))
  expectEqual("Swift.Double", _stdlib_demangleName("$sSdD"))
  expectEqual("x.a : x.Foo<x.Foo<x.Foo<Swift.Int, Swift.Int>, x.Foo<Swift.Int, Swift.Int>>, x.Foo<x.Foo<Swift.Int, Swift.Int>, x.Foo<Swift.Int, Swift.Int>>>",
      _stdlib_demangleName("$s1x1aAA3FooCyADyADySiSiGADySiSiGGADyADySiSiGADySiSiGGGvp"))
  expectEqual("Foobar", _stdlib_demangleName("$s13__lldb_expr_46FoobarCD"))
}

% for optionality in ['', '?']:
Runtime.test("_stdlib_atomicCompareExchangeStrongPtr") {
  typealias IntPtr = UnsafeMutablePointer<Int>
  let origP1: IntPtr${optionality} = IntPtr(bitPattern: 0x10101010)!
  let origP2: IntPtr${optionality} = IntPtr(bitPattern: 0x20202020)!
  let origP3: IntPtr${optionality} = IntPtr(bitPattern: 0x30303030)!

  do {
    var object = origP1
    var expected = origP1
    let r = _stdlib_atomicCompareExchangeStrongPtr(
      object: &object, expected: &expected, desired: origP2)
    expectTrue(r)
    expectEqual(origP2, object)
    expectEqual(origP1, expected)
  }
  do {
    var object = origP1
    var expected = origP2
    let r = _stdlib_atomicCompareExchangeStrongPtr(
      object: &object, expected: &expected, desired: origP3)
    expectFalse(r)
    expectEqual(origP1, object)
    expectEqual(origP1, expected)
  }

  struct FooStruct {
    var i: Int
    var object: IntPtr${optionality}
    var expected: IntPtr${optionality}

    init(object: IntPtr${optionality}, expected: IntPtr${optionality}) {
      self.i = 0
      self.object = object
      self.expected = expected
    }
  }
  do {
    var foo = FooStruct(object: origP1, expected: origP1)
    let r = _stdlib_atomicCompareExchangeStrongPtr(
      object: &foo.object, expected: &foo.expected, desired: origP2)
    expectTrue(r)
    expectEqual(origP2, foo.object)
    expectEqual(origP1, foo.expected)
  }
  do {
    var foo = FooStruct(object: origP1, expected: origP2)
    let r = _stdlib_atomicCompareExchangeStrongPtr(
      object: &foo.object, expected: &foo.expected, desired: origP3)
    expectFalse(r)
    expectEqual(origP1, foo.object)
    expectEqual(origP1, foo.expected)
  }
}
% end

Runtime.test("casting AnyObject to class metatypes") {
  do {
    let ao: AnyObject = SomeClass()
    expectTrue(ao as? Any.Type == nil)
    expectTrue(ao as? AnyClass == nil)
  }

  do {
    var a: Any = SomeClass()
    expectTrue(a as? Any.Type == nil)
    expectTrue(a as? AnyClass == nil)

    a = SomeClass.self
    expectTrue(a as? Any.Type == SomeClass.self)
    expectTrue(a as? AnyClass == SomeClass.self)
    expectTrue(a as? SomeClass.Type == SomeClass.self)
  }
}

func wantonlyWrapInAny<T>(_ x: T) -> Any {
  return x
}

// Because `type(of: x)` and `T.self` have the same type `T.Type` in
// a <T>(x: T) context, both operations must produce the concrete protocol
// type value when `T` is bound to an existential type `P`.
func castWithAbstractionBarrier<T>(_ x: T) -> (
  staticWithConcreteType: T.Type,
  dynamicWithConcreteType: T.Type,
  staticWithErasedType: Any.Type,
  dynamicWithErasedType: Any.Type,
  dynamicExistentialWithErasedType: Any.Type,
  dynamicDoubleWrappedExistentialWithErasedType: Any.Type
) {
  return (
    staticWithConcreteType: T.self,
    dynamicWithConcreteType: type(of: x),
    staticWithErasedType: T.self,
    dynamicWithErasedType: type(of: x),
    dynamicExistentialWithErasedType: type(of: x as Any),
    dynamicDoubleWrappedExistentialWithErasedType:
      type(of: wantonlyWrapInAny(wantonlyWrapInAny(x)))
  )
}

Runtime.test("abstraction barrier on casting generic param bound to existential") {
  let c: SomeConformingClass = SomeConformingSubclass()
  let x: SomeProtocol = c
  let (staticWithConcreteType,
       dynamicWithConcreteType,
       staticWithErasedType,
       dynamicWithErasedType,
       dynamicExistentialWithErasedType,
       dynamicDoubleWrappedExistentialWithErasedType)
    = castWithAbstractionBarrier(x)

  expectTrue(staticWithConcreteType == SomeProtocol.self)
  expectTrue(dynamicWithConcreteType == SomeProtocol.self)
  expectTrue(staticWithErasedType == SomeProtocol.self)
  expectTrue(dynamicWithErasedType == SomeProtocol.self)

  // type(of: x as Any) can be a proper existential type cast
  expectTrue(dynamicExistentialWithErasedType == SomeConformingSubclass.self)
  expectTrue(dynamicDoubleWrappedExistentialWithErasedType
               == SomeConformingSubclass.self)
}

class Malkovich: Malkovichable {
  var malkovich: String { return "malkovich" }
}
protocol Malkovichable: class {
  var malkovich: String { get }
}

struct GenericStructWithReferenceStorage<T> {
  var a: T
  unowned(safe)   var unownedConcrete: Malkovich
  unowned(unsafe) var unmanagedConcrete: Malkovich
  weak            var weakConcrete: Malkovich?

  unowned(safe)   var unownedProto: Malkovichable
  unowned(unsafe) var unmanagedProto: Malkovichable
  weak            var weakProto: Malkovichable?
}

func exerciseReferenceStorageInGenericContext<T>(
    _ x: GenericStructWithReferenceStorage<T>,
    forceCopy y: GenericStructWithReferenceStorage<T>
) {
  expectEqual(x.unownedConcrete.malkovich, "malkovich")
  expectEqual(x.unmanagedConcrete.malkovich, "malkovich")
  expectEqual(x.weakConcrete!.malkovich, "malkovich")
  expectEqual(x.unownedProto.malkovich, "malkovich")
  expectEqual(x.unmanagedProto.malkovich, "malkovich")
  expectEqual(x.weakProto!.malkovich, "malkovich")

  expectEqual(y.unownedConcrete.malkovich, "malkovich")
  expectEqual(y.unmanagedConcrete.malkovich, "malkovich")
  expectEqual(y.weakConcrete!.malkovich, "malkovich")
  expectEqual(y.unownedProto.malkovich, "malkovich")
  expectEqual(y.unmanagedProto.malkovich, "malkovich")
  expectEqual(y.weakProto!.malkovich, "malkovich")
}

Runtime.test("Struct layout with reference storage types") {
  let malkovich = Malkovich()

  let x = GenericStructWithReferenceStorage(a:                 malkovich,
                                            unownedConcrete:   malkovich,
                                            unmanagedConcrete: malkovich,
                                            weakConcrete:      malkovich,
                                            unownedProto:      malkovich,
                                            unmanagedProto:    malkovich,
                                            weakProto:         malkovich)
  exerciseReferenceStorageInGenericContext(x, forceCopy: x)

  expectEqual(x.unownedConcrete.malkovich, "malkovich")
  expectEqual(x.unmanagedConcrete.malkovich, "malkovich")
  expectEqual(x.weakConcrete!.malkovich, "malkovich")
  expectEqual(x.unownedProto.malkovich, "malkovich")
  expectEqual(x.unmanagedProto.malkovich, "malkovich")
  expectEqual(x.weakProto!.malkovich, "malkovich")

  // Make sure malkovich lives long enough.
  print(malkovich)
}

Runtime.test("SwiftError layout constants for LLDB") {
#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
  let RTLD_DEFAULT = UnsafeMutableRawPointer(bitPattern: -2)
#elseif os(Linux)
  let RTLD_DEFAULT = UnsafeMutableRawPointer(bitPattern: 0)
#elseif os(Android)
  #if arch(arm)
    let RTLD_DEFAULT = UnsafeMutableRawPointer(bitPattern: 0xffffffff as UInt)
  #elseif arch(arm64)
    let RTLD_DEFAULT = UnsafeMutableRawPointer(bitPattern: 0)
  #else
    _UnimplementedError()
  #endif
#elseif os(Windows)
  let hStdlibCore: HMODULE = GetModuleHandleA("swiftCore.dll")!
#else
  _UnimplementedError()
#endif

#if os(Windows)
  let offsetof_SwiftError_typeMetadata: UnsafeRawPointer =
      unsafeBitCast(GetProcAddress(hStdlibCore,
                                   "_swift_lldb_offsetof_SwiftError_typeMetadata")!,
                    to: UnsafeRawPointer.self)
  let sizeof_SwiftError: UnsafeRawPointer =
      unsafeBitCast(GetProcAddress(hStdlibCore,
                                   "_swift_lldb_sizeof_SwiftError")!,
                    to: UnsafeRawPointer.self)
#else
  let offsetof_SwiftError_typeMetadata =
    dlsym(RTLD_DEFAULT, "_swift_lldb_offsetof_SwiftError_typeMetadata")!
  let sizeof_SwiftError =
    dlsym(RTLD_DEFAULT, "_swift_lldb_sizeof_SwiftError")!
#endif
#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
#if arch(i386) || arch(arm)
  expectEqual(20, offsetof_SwiftError_typeMetadata.load(as: UInt.self))
  expectEqual(36, sizeof_SwiftError.load(as: UInt.self))
#else
  expectEqual(40, offsetof_SwiftError_typeMetadata.load(as: UInt.self))
  expectEqual(72, sizeof_SwiftError.load(as: UInt.self))
#endif
#elseif os(Linux) || os(Android) || os(Windows)
  expectEqual(16, offsetof_SwiftError_typeMetadata.load(as: UInt.self))
  expectEqual(32, sizeof_SwiftError.load(as: UInt.self))
#else
  _UnimplementedError()
#endif
}

var Reflection = TestSuite("Reflection")

func wrap1   (_ x: Any) -> Any { return x }
func wrap2<T>(_ x: T)   -> Any { return wrap1(x) }
func wrap3   (_ x: Any) -> Any { return wrap2(x) }
func wrap4<T>(_ x: T)   -> Any { return wrap3(x) }
func wrap5   (_ x: Any) -> Any { return wrap4(x) }

class JustNeedAMetatype {}

Reflection.test("nested existential containers") {
  let wrapped = wrap5(JustNeedAMetatype.self)
  expectEqual("\(wrapped)", "JustNeedAMetatype")
}

Reflection.test("dumpToAStream") {
  var output = ""
  dump([ 42, 4242 ], to: &output)
  expectEqual("▿ 2 elements\n  - 42\n  - 4242\n", output)
}


class Brilliant {
  let first: Int
  let second: String

  init(_ fst: Int, _ snd: String) {
    self.first = fst
    self.second = snd
  }
}

Reflection.test("ObjectIdentifier/Hashable,Comparable") {
  // Check that object identifiers are unique to class instances.
  let a = Brilliant(1, "")
  let b = Brilliant(2, "")
  let c = Brilliant(3, "")

  checkHashable(
    [a, b, c].map(ObjectIdentifier.init),
    equalityOracle: { $0 == $1 })

  // Comparable
  func isComparable<X : Comparable>(_ x: X) {}
  isComparable(ObjectIdentifier(a))
  // Check the ObjectIdentifier created is stable
  expectTrue(
    (ObjectIdentifier(a) < ObjectIdentifier(b))
    != (ObjectIdentifier(a) > ObjectIdentifier(b)))
  expectFalse(
    ObjectIdentifier(a) >= ObjectIdentifier(b)
    && ObjectIdentifier(a) <= ObjectIdentifier(b))

  // Check that ordering is transitive.
  expectEqual(
    [ ObjectIdentifier(a), ObjectIdentifier(b), ObjectIdentifier(c) ].sorted(),
    [ ObjectIdentifier(c), ObjectIdentifier(b), ObjectIdentifier(a) ].sorted())
}

Reflection.test("ObjectIdentifier/CustomDebugStringConvertible") {
  let obj1 = Brilliant(1, "")
  let obj2 = Brilliant(2, "")

  let oi1 = ObjectIdentifier(obj1)
  let oi2 = ObjectIdentifier(obj2)

  expectEqual(String(reflecting: oi1), String(reflecting: oi1))
  expectNotEqual(String(reflecting: oi1), String(reflecting: oi2))

  let p1 = UnsafeRawPointer(bitPattern: UInt(bitPattern: oi1))!
  expectPrinted("ObjectIdentifier(\(p1))", oi1)
  let p2 = UnsafeRawPointer(bitPattern: Int(bitPattern: oi1))!
  expectPrinted("ObjectIdentifier(\(p2))", oi1)

}

class C: Q1 & Codable { }

Reflection.test("multiprotocolTypes") {
  // [SR-8158]: Printing type(of: Codable & Protocol type ) EXC_BAD_ACCESS
  // This use of String(reflecting:) exercises a previously incorrect cast in
  // NonFixedExistentialMetatypeBox::Container::getNumWitnessTables.
  let obj: Q1 & Codable = C()
  let t = type(of: obj)
  let x = String(reflecting: t)
  expectEqual("a.C", x)
}


var BitTwiddlingTestSuite = TestSuite("BitTwiddling")

BitTwiddlingTestSuite.test("_pointerSize") {
#if arch(i386) || arch(arm)
  expectEqual(4, MemoryLayout<Optional<AnyObject>>.size)
#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le) || arch(s390x)
  expectEqual(8, MemoryLayout<Optional<AnyObject>>.size)
#else
  fatalError("implement")
#endif
}

BitTwiddlingTestSuite.test("_isPowerOf2/Int") {
  func asInt(_ a: Int) -> Int { return a }

  expectFalse(_isPowerOf2(asInt(-1025)))
  expectFalse(_isPowerOf2(asInt(-1024)))
  expectFalse(_isPowerOf2(asInt(-1023)))
  expectFalse(_isPowerOf2(asInt(-4)))
  expectFalse(_isPowerOf2(asInt(-3)))
  expectFalse(_isPowerOf2(asInt(-2)))
  expectFalse(_isPowerOf2(asInt(-1)))
  expectFalse(_isPowerOf2(asInt(0)))
  expectTrue(_isPowerOf2(asInt(1)))
  expectTrue(_isPowerOf2(asInt(2)))
  expectFalse(_isPowerOf2(asInt(3)))
  expectTrue(_isPowerOf2(asInt(1024)))
#if arch(i386) || arch(arm)
  // Not applicable to 32-bit architectures.
#elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le) || arch(s390x)
  expectTrue(_isPowerOf2(asInt(0x8000_0000)))
#else
  fatalError("implement")
#endif
  expectFalse(_isPowerOf2(Int.min))
  expectFalse(_isPowerOf2(Int.max))
}

BitTwiddlingTestSuite.test("_isPowerOf2/UInt") {
  func asUInt(_ a: UInt) -> UInt { return a }

  expectFalse(_isPowerOf2(asUInt(0)))
  expectTrue(_isPowerOf2(asUInt(1)))
  expectTrue(_isPowerOf2(asUInt(2)))
  expectFalse(_isPowerOf2(asUInt(3)))
  expectTrue(_isPowerOf2(asUInt(1024)))
  expectTrue(_isPowerOf2(asUInt(0x8000_0000)))
  expectFalse(_isPowerOf2(UInt.max))
}

var AvailabilityVersionsTestSuite = TestSuite("AvailabilityVersions")

AvailabilityVersionsTestSuite.test("_stdlib_isOSVersionAtLeast") {
  func isAtLeastOS(_ major: Int, _ minor: Int, _ patch: Int) -> Bool {
    return Bool(_builtinBooleanLiteral: _stdlib_isOSVersionAtLeast(
                                          major._builtinWordValue,
                                          minor._builtinWordValue,
                                          patch._builtinWordValue))
  }

// _stdlib_isOSVersionAtLeast is broken for
// watchOS. rdar://problem/20234735
#if os(macOS) || os(iOS) || os(tvOS) || os(watchOS)
  // This test assumes that no version component on an OS we test upon
  // will ever be greater than 1066 and that every major version will always
  // be greater than 1.
  expectFalse(isAtLeastOS(1066, 0, 0))
  expectTrue(isAtLeastOS(0, 1066, 0))
  expectTrue(isAtLeastOS(0, 0, 1066))
  
  // 9999 is a special version that's always available
  expectTrue(isAtLeastOS(9999, 0, 0))
#endif
}

runAllTests()