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Array's getObjects:range: needs to fill the supplied buffer without incrementing the reference count. For that reason, and to fulfill lifetime expectations for Array elements that are computed dynamically (e.g. from value types that are BridgedToObjectiveC), we maintain a cache of converted objects associated with each Array. Swift SVN r16105
114 lines
3.3 KiB
Swift
114 lines
3.3 KiB
Swift
//===--- BridgeCache.swift - Array bridging implementation test -----------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// When a NativeArray<T> is bridged to Objective-C, and T isn't
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// "bridged verbatim," Cocoa operations like objectAtIndex may have
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// to conjure up an object to return, and this object is expected to
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// outlive the array. We cache these objects so that their lifetimes
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// are guaranteed. Here we test the cache.
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//
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//===----------------------------------------------------------------------===//
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// RUN: %target-run-simple-swift %s | FileCheck %s
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import SwiftShims
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//===--- class Tracked ----------------------------------------------------===//
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// Instead of testing with Int elements, we use this wrapper class
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// that can help us track allocations and find issues with object
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// lifetime inside Array implementations.
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var trackedCount = 0
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var nextTrackedSerialNumber = 0
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class Tracked : ReplPrintable, ForwardIndex, ObjCClassType {
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init(value: Int) {
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++trackedCount
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serialNumber = ++nextTrackedSerialNumber
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self.value = value
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}
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deinit {
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assert(serialNumber > 0, "double destruction!")
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--trackedCount
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serialNumber = -serialNumber
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}
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func replPrint() {
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assert(serialNumber > 0, "dead Tracked!")
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value.replPrint()
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}
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func succ() -> Tracked {
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return Tracked(self.value.succ())
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}
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var value: Int
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var serialNumber: Int
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}
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func == (x: Tracked, y: Tracked) -> Bool {
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return x.value == y.value
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}
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struct X : BridgedToObjectiveC {
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func bridgeToObjectiveC() -> Tracked {
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return Tracked(value)
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}
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var value: Int
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}
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// CHECK: testing...
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println("testing...")
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func testScope() {
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let a = [X(1), X(2), X(3)]
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let nsx = a.asCocoaArray()
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// construction of these tracked objects is lazy
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// CHECK-NEXT: trackedCount = 0 .
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println("trackedCount = \(trackedCount) .")
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// We can get a single element out
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// CHECK-NEXT: nsx[0]: 1 .
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var one = (nsx.objectAtIndex(0) as Tracked)!
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println("nsx[0]: \(one.value) .")
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// If we get the element again, it has the same object identity
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// CHECK-NEXT: object identity matches: true
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var anotherOne = (nsx.objectAtIndex(0) as Tracked)!
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println("object identity matches: \(one === anotherOne)")
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// We've only constructed one such object
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// CHECK-NEXT: trackedCount = 1 .
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println("trackedCount = \(trackedCount) .")
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// Because the elements come back at +0, we really don't want to
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// treat them as objects, or we'll get double deletion
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let objects: Word[] = [0, 0]
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nsx.getObjects(
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UnsafePointer(objects.buffer.elementStorage), // pointer cast
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_SwiftNSRange(1, 2))
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// CHECK-NEXT: getObjects yields them at +0: true
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var x = objects[0]
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println("getObjects yields them at +0: \(isUniquelyReferenced(&x))")
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// CHECK-NEXT: trackedCount = 3 .
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println("trackedCount = \(trackedCount) .")
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}
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testScope()
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// FIXME: should be "leaks = 0" but for <rdar://problem/16562426>
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// CHECK-NEXT: leaks = 1 .
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println("leaks = \(trackedCount) .")
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