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// RUN: %target-run-simple-swift | %FileCheck %s
// REQUIRES: executable_test
import StdlibUnittest
extension String {
var bufferID: UInt {
guard let id = _classify()._objectIdentifier else { return 0 }
return UInt(bitPattern: id)
}
}
// CHECK-NOT: Reallocations exceeded 15
func testReallocation() {
let x = "The quick brown fox jumped over the lazy dog\n"._split(separator: " ")
var story = "Let me tell you a story:"
let laps = 1000
var reallocations = 0
for _ in 0..<laps {
for s in x {
let lastBase = story.bufferID
story += " "
story += s
if lastBase != story.bufferID {
reallocations += 1
// To avoid dumping a vast string here, just write the first
// part of the story out each time there's a reallocation.
var intro = story._split(separator: ":")[0]
print("""
reallocation \(reallocations), lastBase 0x\(
String(lastBase, radix: 16)), bufferID 0x\(
String(story.bufferID, radix: 16)), intro \(intro)
""")
if reallocations >= 15 {
print("Reallocations exceeded 15")
//return
}
}
}
story += "."
}
print("total reallocations = \(reallocations)")
}
testReallocation()
print("done!")
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