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7629253ab5
Specifically, when the class is referenced from Objective-C first,
before being referenced from Swift in any way. This is important for
resilience, since up until now Objective-C isn't used to the size of a
class changing based on anything other than a superclass's size
changing.
This is basically the test that would have gone with 9024768b0 had
there been a build of libobjc to test it with.
rdar://problem/45718008
66 lines
2.0 KiB
Swift
66 lines
2.0 KiB
Swift
import Resilient
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import Foundation
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import OneWordSuperclass
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public class StaticClass: OneWordSuperclass {
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@objc var first: Int32 = 0
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var middle = GrowsToInt64()
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@objc var last: Int = 0
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@objc public static var offsetOfFirst: Int {
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// IRGen lays out Swift classes that subclass Objective-C classes as if the
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// only superclass was NSObject, so the starting (offset % alignment) isn't
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// always 0. This means that on 32-bit platforms we'll have a gap *before*
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// 'first' when we need 8-byte alignment, rather than after as you'd see in
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// a struct (or base class).
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return max(MemoryLayout<Int>.size, MemoryLayout<GrowsToInt64>.alignment) +
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MemoryLayout<Int>.size
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}
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@objc public static var totalSize: Int {
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return (2 * MemoryLayout<Int>.size) +
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(2 * MemoryLayout<GrowsToInt64>.size) + // alignment
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MemoryLayout<Int>.size
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}
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}
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/// This class has the same layout as `StaticClass`, but will be accessed using
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/// `NSClassFromString` instead of `+class`.
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public class DynamicClass: OneWordSuperclass {
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@objc var first: Int32 = 0
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var middle = GrowsToInt64()
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@objc var last: Int = 0
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@objc public static var offsetOfFirst: Int {
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// See above.
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return max(MemoryLayout<Int>.size, MemoryLayout<GrowsToInt64>.alignment) +
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MemoryLayout<Int>.size
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}
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@objc public static var totalSize: Int {
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return (2 * MemoryLayout<Int>.size) +
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(2 * MemoryLayout<GrowsToInt64>.size) + // alignment
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MemoryLayout<Int>.size
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}
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}
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public class PureSwiftBaseClass {
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var word: Int64 = 0
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}
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public class PureSwiftClass: PureSwiftBaseClass {
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@objc var first: Int32 = 0
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var middle = GrowsToInt64()
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@objc var last: Int = 0
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@objc public static var offsetOfFirst: Int {
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return (2 * MemoryLayout<Int>.size) + MemoryLayout<Int64>.size
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}
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@objc public static var totalSize: Int {
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return (2 * MemoryLayout<Int>.size) + MemoryLayout<Int64>.size +
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(2 * MemoryLayout<GrowsToInt64>.size) + // alignment
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MemoryLayout<Int>.size
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}
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}
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