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1fb0f889d7
Previously, it was possible to write Unsafe[Mutable]Pointer(x) and have Swift deduce the pointee type based on context. Since reinterpreting memory is a fundamentally type-unsafe operation, it's better to be explicit about conversions from Unsafe[Mutable]Pointer<T> to Unsafe[Mutable]Pointer<U>. This change is consistent with the move from reinterpretCast(x) to unsafeBitCast(x, T.self). Also, we've encoded the operations of explicitly adding or removing mutability as properties, so that adding mutability can be separated from wild reinterpretCast'ing, a much more severe form of unsafety. Swift SVN r21324
49 lines
1.4 KiB
Swift
49 lines
1.4 KiB
Swift
// RUN: %target-run-simple-swift | FileCheck %s
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import Foundation
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class Canary: NSObject {
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deinit {
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println("died")
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}
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}
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var CanaryAssocObjectHandle: UInt8 = 0
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// Attach an associated object with a loud deinit so we can see that the
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// object died.
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func hangCanary(o: AnyObject) {
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objc_setAssociatedObject(o, &CanaryAssocObjectHandle, Canary(),
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objc_AssociationPolicy(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
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}
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// CHECK-LABEL: NSData:
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println("NSData:")
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autoreleasepool {
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var bytes: UnsafeMutablePointer<UInt8>
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do {
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let data = NSData(bytes: [2, 3, 5, 7] as [UInt8], length: 4)
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hangCanary(data)
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bytes = data.bytes.asPointerTo(UInt8.self).asMutablePointer
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} while false // CHECK-NOT: died
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println(bytes[0]) // CHECK: 2
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println(bytes[1]) // CHECK-NEXT: 3
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println(bytes[2]) // CHECK-NEXT: 5
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println(bytes[3]) // CHECK-NEXT: 7
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} // CHECK-NEXT: died
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// CHECK-LABEL: AnyObject:
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println("AnyObject:")
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autoreleasepool {
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var bytes: UnsafeMutablePointer<UInt8>
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do {
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let data = NSData(bytes: [11, 13, 17, 19] as [UInt8], length: 4)
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hangCanary(data)
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let dataAsAny: AnyObject = data
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bytes = dataAsAny.bytes!.asPointerTo(UInt8.self).asMutablePointer
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} while false // CHECK-NOT: died
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println(bytes[0]) // CHECK: 11
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println(bytes[1]) // CHECK-NEXT: 13
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println(bytes[2]) // CHECK-NEXT: 17
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println(bytes[3]) // CHECK-NEXT: 19
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} // CHECK-NEXT: died
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