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524cfae1b2
* Dynamic Cast Rework: Runtime This is a completely refactored version of the core swift_dynamicCast runtime method. This fixes a number of bugs, especially in the handling of multiply-wrapped types such as Optional within Any. The result should be much closer to the behavior specified by `docs/DynamicCasting.md`. Most of the type-specific logic is simply copied over from the earlier implementation, but the overall structure has been changed to be uniformly recursive. In particular, this provides uniform handling of Optional, existentials, Any and other common "box" types along all paths. The consistent structure should also be easier to update in the future with new general types. Benchmarking does not show any noticable performance implications. **Temporarily**, the old implementation is still available. Setting the environment variable `SWIFT_OLD_DYNAMIC_CAST_RUNTIME` before launching a program will use the old runtime implementation. This is only to facilitate testing; once the new implementation is stable, I expect to completely remove the old implementation.
147 lines
3.5 KiB
Swift
147 lines
3.5 KiB
Swift
// -*- swift -*-
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// RUN: %target-run-simple-swiftgyb
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// REQUIRES: executable_test
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// FIXME: Casting.cpp has dozens of places to fail a cast. This test does not
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// attempt to enumerate them all.
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import StdlibUnittest
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#if _runtime(_ObjC)
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import Foundation
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#endif
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% types = []
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% objectTypes = []
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% protocolTypes = []
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% ObjCTypes = []
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% types.append(['main.Class1', 'main.Class2'])
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% objectTypes.append(['main.Class1', 'main.Class2'])
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class Class1 { }
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class Class2 { }
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% types.append(['main.Struct1', 'main.Struct2'])
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struct Struct1 { }
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struct Struct2 { }
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% types.append(['main.ObjCClass1', 'main.ObjCClass2'])
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% objectTypes.append(['main.ObjCClass1', 'main.ObjCClass2'])
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% ObjCTypes.extend(['main.ObjCClass1', 'main.ObjCClass2'])
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#if _runtime(_ObjC)
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class ObjCClass1 : NSObject { }
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class ObjCClass2 : NSObject { }
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#endif
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% types.append(['DateFormatter', 'NumberFormatter'])
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% objectTypes.append(['DateFormatter', 'NumberFormatter'])
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% ObjCTypes.extend(['DateFormatter', 'NumberFormatter'])
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// non-Swift Objective-C class
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% protocolTypes.append('main.Proto1')
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% protocolTypes.append('main.Proto2')
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protocol Proto1 { }
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protocol Proto2 { }
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% protocolTypes.append('URLSessionDelegate')
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% ObjCTypes.append('URLSessionDelegate')
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// non-Swift Objective-C protocol
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var CastTrapsTestSuite = TestSuite("CastTraps")
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// Test `(T1() as Any) as T2` cast failure
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// for all type pairs.
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% for (t1, _) in types:
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% for (_, t2) in types:
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% if t1 not in ObjCTypes and t2 not in ObjCTypes:
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CastTrapsTestSuite.test("${t1}__${t2}")
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.skip(.custom(
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{ _isFastAssertConfiguration() },
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reason: "this trap is not guaranteed to happen in -Ounchecked"))
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.crashOutputMatches("Could not cast value of type '")
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.crashOutputMatches("${t1}' ")
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.crashOutputMatches(" to '")
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.crashOutputMatches("${t2}'")
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.code
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{
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let o = ${t1}() as Any
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expectCrashLater()
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let r = o as! ${t2}
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_blackHole(r)
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}
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% end
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% end
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% end
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// Test `(T1() as AnyObject) as T2` cast failure
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// for object type to protocol type pairs
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% for (t1, _) in objectTypes:
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% for (t2) in protocolTypes:
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% if t1 not in ObjCTypes and t2 not in ObjCTypes:
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CastTrapsTestSuite.test("${t1}__${t2}")
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.skip(.custom(
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{ _isFastAssertConfiguration() },
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reason: "this trap is not guaranteed to happen in -Ounchecked"))
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.crashOutputMatches("Could not cast value of type '")
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.crashOutputMatches("${t1}' ")
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.crashOutputMatches(" to '")
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.crashOutputMatches("${t2}'")
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.code
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{
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let o = ${t1}() as AnyObject
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expectCrashLater()
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let r = o as! ${t2}
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_blackHole(r)
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}
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% end
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% end
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% end
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protocol P2 {}
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if #available(macOS 9999, iOS 9999, watchOS 9999, tvOS 9999, *) {
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CastTrapsTestSuite.test("Unexpected null")
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.crashOutputMatches("Found unexpected null pointer value while trying to cast value of type '")
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.crashOutputMatches("Foo'")
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.crashOutputMatches(" to '")
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.crashOutputMatches("P2'")
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.code
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{
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class Foo {}
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let n = UnsafeRawPointer(bitPattern: 0)
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var o: Foo = unsafeBitCast(n, to: Foo.self)
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let r = o as Any
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expectCrashLater()
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let s = r as? P2
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_blackHole(s)
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}
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}
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#if _runtime(_ObjC)
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if #available(macOS 9999, iOS 9999, watchOS 9999, tvOS 9999, *) {
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CastTrapsTestSuite.test("Unexpected Obj-C null")
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.crashOutputMatches("Found unexpected null pointer value while trying to cast value of type '")
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.crashOutputMatches("NSObject'")
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.crashOutputMatches(" to '")
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.crashOutputMatches("P2'")
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.code
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{
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let n = UnsafeRawPointer(bitPattern: 0)
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var o: NSObject = unsafeBitCast(n, to: NSObject.self)
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let r = o as Any
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expectCrashLater()
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let s = r as? P2
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_blackHole(s)
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}
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}
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#endif
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runAllTests()
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