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e45dfe09c6
...and then because of a compiler bug (SR-806), rename the helper properties to 'asNative' and 'asCocoa'. None of this is API, so there is no migration information.
138 lines
4.0 KiB
Swift
138 lines
4.0 KiB
Swift
// RUN: %target-run-stdlib-swift | FileCheck %s
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// REQUIRES: executable_test
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//
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// Parts of this test depend on memory allocator specifics. The test
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// should be rewritten soon so it doesn't expose legacy components
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// like OpaqueString anyway, so we can just disable the failing
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// configuration
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//
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// Memory allocator specifics also vary across platforms.
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// REQUIRES: CPU=x86_64, OS=macosx
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import Foundation
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import Swift
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func hexAddrVal<T>(x: T) -> String {
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return "@0x" + String(UInt64(unsafeBitCast(x, to: Int.self)), radix: 16)
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}
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func hexAddr(x: AnyObject?) -> String {
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if let owner = x {
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if let y = owner as? _StringBuffer._Storage.Storage {
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return ".native\(hexAddrVal(y))"
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}
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if let y = owner as? NSString {
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return ".cocoa\(hexAddrVal(y))"
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}
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else {
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return "?Uknown?\(hexAddrVal(owner))"
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}
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}
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return "nil"
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}
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func repr(x: NSString) -> String {
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return "\(NSStringFromClass(object_getClass(x)))\(hexAddr(x)) = \"\(x)\""
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}
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func repr(x: _StringCore) -> String {
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if x.hasContiguousStorage {
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if let b = x.nativeBuffer {
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var offset = x.elementWidth == 2
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? UnsafeMutablePointer(b.start) - x.startUTF16
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: UnsafeMutablePointer(b.start) - x.startASCII
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return "Contiguous(owner: "
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+ "\(hexAddr(x._owner))[\(offset)...\(x.count + offset)]"
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+ ", capacity = \(b.capacity))"
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}
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return "Contiguous(owner: \(hexAddr(x._owner)), count: \(x.count))"
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}
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else if let b2 = x.cocoaBuffer {
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return "Opaque(buffer: \(hexAddr(b2))[0...\(x.count)])"
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}
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return "?????"
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}
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func repr(x: String) -> String {
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return "String(\(repr(x._core))) = \"\(x)\""
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}
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// ===------- Appending -------===
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// CHECK: --- Appending ---
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print("--- Appending ---")
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var s = "⓪" // start non-empty
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// To make this test independent of the memory allocator implementation,
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// explicitly request initial capacity.
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s.reserveCapacity(8)
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// CHECK-NEXT: String(Contiguous(owner: .native@[[buffer0:[x0-9a-f]+]][0...2], capacity = 8)) = "⓪1"
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s += "1"
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print("\(repr(s))")
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// CHECK-NEXT: String(Contiguous(owner: .native@[[buffer1:[x0-9a-f]+]][0...8], capacity = 8)) = "⓪1234567"
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s += "234567"
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print("\(repr(s))")
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// -- expect a reallocation here
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// CHECK-NEXT: String(Contiguous(owner: .native@[[buffer2:[x0-9a-f]+]][0...9], capacity = 16)) = "⓪12345678"
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// CHECK-NOT: .native@[[buffer1]]
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s += "8"
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print("\(repr(s))")
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// CHECK-NEXT: String(Contiguous(owner: .native@[[buffer2]][0...16], capacity = 16)) = "⓪123456789012345"
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s += "9012345"
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print("\(repr(s))")
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// -- expect a reallocation here
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// Appending more than the next level of capacity only takes as much
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// as required. I'm not sure whether this is a great idea, but the
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// point is to prevent huge amounts of fragmentation when a long
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// string is appended to a short one. The question, of course, is
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// whether more appends are coming, in which case we should give it
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// more capacity. It might be better to always grow to a multiple of
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// the current capacity when the capacity is exceeded.
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// CHECK-NEXT: String(Contiguous(owner: .native@[[buffer3:[x0-9a-f]+]][0...48], capacity = 48))
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// CHECK-NOT: .native@[[buffer2]]
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s += s + s
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print("\(repr(s))")
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// -- expect a reallocation here
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// CHECK-NEXT: String(Contiguous(owner: .native@[[buffer4:[x0-9a-f]+]][0...49], capacity = 96))
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// CHECK-NOT: .native@[[buffer3]]
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s += "C"
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print("\(repr(s))")
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/// An additional reference to the same buffer doesn't, by itself,
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/// impede the use of available capacity
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var s1 = s
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// CHECK-NEXT: String(Contiguous(owner: .native@[[buffer4]][0...50], capacity = 96))
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s += "F"
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print("\(repr(s))")
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// CHECK-NEXT: String(Contiguous(owner: .native@[[buffer4]][0...49], capacity = 96))
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print("\(repr(s1))")
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/// The use of later buffer capacity by another string forces
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/// reallocation
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// CHECK-NEXT: String{{.*}} = {{.*}}X"
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// CHECK-NOT: .native@[[buffer4]]
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s1 += "X"
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print("\(repr(s1))")
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/// Appending to an empty string re-uses the RHS
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// CHECK-NEXT: .native@[[buffer4]]
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var s2 = String()
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s2 += s
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print("\(repr(s2))")
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