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0b75ee975e
Update for SE-0107: UnsafeRawPointer This adds a "mutating" initialize to UnsafePointer to make Immutable -> Mutable conversions explicit. These are quick fixes to stdlib, overlays, and test cases that are necessary in order to remove arbitrary UnsafePointer conversions. Many cases can be expressed better up by reworking the surrounding code, but we first need a working starting point.
54 lines
1.5 KiB
Swift
54 lines
1.5 KiB
Swift
// RUN: %target-run-simple-swift | FileCheck %s
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// REQUIRES: executable_test
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// REQUIRES: objc_interop
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import Foundation
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class Canary: NSObject {
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deinit {
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print("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_ASSOCIATION_RETAIN_NONATOMIC)
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}
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// CHECK-LABEL: NSData:
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print("NSData:")
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autoreleasepool {
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var bytes: UnsafeMutablePointer<UInt8>
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repeat {
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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 = UnsafeMutablePointer<UInt8>(mutating: data.bytes.assumingMemoryBound(to: UInt8.self))
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} while false // CHECK-NOT: died
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print(bytes[0]) // CHECK: 2
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print(bytes[1]) // CHECK-NEXT: 3
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print(bytes[2]) // CHECK-NEXT: 5
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print(bytes[3]) // CHECK-NEXT: 7
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} // CHECK-NEXT: died
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// CHECK-LABEL: AnyObject:
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print("AnyObject:")
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autoreleasepool {
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var bytes: UnsafeMutablePointer<UInt8>
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repeat {
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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 = UnsafeMutablePointer<UInt8>(mutating: dataAsAny.bytes!.assumingMemoryBound(to: UInt8.self))
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} while false // CHECK-NOT: died
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print(bytes[0]) // CHECK: 11
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print(bytes[1]) // CHECK-NEXT: 13
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print(bytes[2]) // CHECK-NEXT: 17
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print(bytes[3]) // CHECK-NEXT: 19
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} // CHECK-NEXT: died
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