mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
123 lines
3.7 KiB
Swift
123 lines
3.7 KiB
Swift
// Casts.swift - Tests for conversion between types.
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See https://swift.org/LICENSE.txt for license information
|
|
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
// -----------------------------------------------------------------------------
|
|
///
|
|
/// Contains tests for conversions between types which shouldn't trap.
|
|
///
|
|
// -----------------------------------------------------------------------------
|
|
// RUN: %target-run-simple-swift
|
|
// REQUIRES: executable_test
|
|
|
|
import StdlibUnittest
|
|
#if _runtime(_ObjC)
|
|
import Foundation
|
|
#endif
|
|
|
|
let CastsTests = TestSuite("Casts")
|
|
|
|
// Test for SR-426: missing release for some types after failed conversion
|
|
CastsTests.test("No leak for failed tuple casts") {
|
|
let t: Any = (1, LifetimeTracked(0))
|
|
expectFalse(t is Any.Type)
|
|
}
|
|
|
|
protocol P {}
|
|
class ErrClass : Error { }
|
|
|
|
CastsTests.test("No overrelease of existential boxes in failed casts") {
|
|
// Test for crash from SR-392
|
|
// We fail casts of an existential box repeatedly
|
|
// to ensure it does not get over-released.
|
|
func bar<T>(_ t: T) {
|
|
for _ in 0..<10 {
|
|
if case let a as P = t {
|
|
_ = a
|
|
}
|
|
}
|
|
}
|
|
|
|
let err: Error = ErrClass()
|
|
bar(err)
|
|
}
|
|
|
|
extension Int : P {}
|
|
|
|
// Test for SR-7664: Inconsistent optional casting behaviour with generics
|
|
// Runtime failed to unwrap multiple levels of Optional when casting.
|
|
CastsTests.test("Multi-level optionals can be casted") {
|
|
func testSuccess<From, To>(_ x: From, from: From.Type, to: To.Type) {
|
|
expectNotNil(x as? To)
|
|
}
|
|
func testFailure<From, To>(_ x: From, from: From.Type, to: To.Type) {
|
|
expectNil(x as? To)
|
|
}
|
|
testSuccess(42, from: Int?.self, to: Int.self)
|
|
testSuccess(42, from: Int??.self, to: Int.self)
|
|
testSuccess(42, from: Int???.self, to: Int.self)
|
|
testSuccess(42, from: Int???.self, to: Int?.self)
|
|
testSuccess(42, from: Int???.self, to: Int??.self)
|
|
testSuccess(42, from: Int???.self, to: Int???.self)
|
|
testFailure(42, from: Int?.self, to: String.self)
|
|
testFailure(42, from: Int??.self, to: String.self)
|
|
testFailure(42, from: Int???.self, to: String.self)
|
|
}
|
|
|
|
// Test for SR-9837: Optional<T>.none not casting to Optional<U>.none in generic context
|
|
CastsTests.test("Optional<T>.none can be casted to Optional<U>.none in generic context") {
|
|
func test<T>(_ type: T.Type) -> T? {
|
|
return Any?.none as? T
|
|
}
|
|
|
|
expectEqual(type(of: test(Bool.self)), Bool?.self)
|
|
expectEqual(type(of: test(Bool?.self)), Bool??.self)
|
|
}
|
|
|
|
#if _runtime(_ObjC)
|
|
extension CFBitVector : P {
|
|
static func makeImmutable(from values: Array<UInt8>) -> CFBitVector {
|
|
return CFBitVectorCreate(/*allocator:*/ nil, values, values.count * 8)
|
|
}
|
|
}
|
|
|
|
extension CFMutableBitVector {
|
|
static func makeMutable(from values: Array<UInt8>) -> CFMutableBitVector {
|
|
return CFBitVectorCreateMutableCopy(
|
|
/*allocator:*/ nil,
|
|
/*capacity:*/ 0,
|
|
CFBitVector.makeImmutable(from: values))
|
|
}
|
|
}
|
|
|
|
func isP<T>(_ t: T) -> Bool {
|
|
return t is P
|
|
}
|
|
|
|
CastsTests.test("Dynamic casts of CF types to protocol existentials")
|
|
.skip(.custom(
|
|
{ !_isDebugAssertConfiguration() },
|
|
reason: "This test behaves unpredictably in optimized mode."))
|
|
.code {
|
|
expectTrue(isP(10 as Int))
|
|
|
|
// FIXME: SR-2289: dynamic casting of CF types to protocol existentials
|
|
// should work, but there is a bug in the runtime that prevents them from
|
|
// working.
|
|
expectFailure {
|
|
expectTrue(isP(CFBitVector.makeImmutable(from: [10, 20])))
|
|
}
|
|
expectFailure {
|
|
expectTrue(isP(CFMutableBitVector.makeMutable(from: [10, 20])))
|
|
}
|
|
}
|
|
#endif
|
|
|
|
runAllTests()
|