NewArray.swift.gyb

%# -*- mode: swift -*-
//===--- NewArray.swift.gyb -----------------------------------*- swift -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
// RUN: %empty-directory(%t)
// RUN: %gyb %s -o %t/NewArray.swift
// RUN: %line-directive %t/NewArray.swift -- %target-build-swift %t/NewArray.swift -o %t/a.out -Xfrontend -disable-access-control
// RUN: %target-codesign %t/a.out
// RUN: %target-run %t/a.out 2>&1 | %line-directive %t/NewArray.swift -- %FileCheck %t/NewArray.swift --check-prefix=CHECK --check-prefix=CHECK-%target-runtime
// REQUIRES: executable_test

import StdlibUnittest
import StdlibCollectionUnittest

//===----------------------------------------------------------------------===//

func printSequence<T : Sequence>(_ x: T) {
  print("[", terminator: "")
  var prefix = ""
  for a in x {
    print(prefix, terminator: "")
    print(a, terminator: "")
    prefix = ", "
  }
  print("]")
}

typealias _BufferID = UnsafeRawPointer?

protocol MyArrayProtocol
  : RandomAccessCollection,
    RangeReplaceableCollection,
    MutableCollection,
    ExpressibleByArrayLiteral
  where ArrayLiteralElement == Element
{
  var _owner: AnyObject? { get }

  var capacity: Int { get }

  static func += <
    S : Sequence
  >(lhs: inout Self, rhs: S)
  where S.Iterator.Element == Iterator.Element
}
extension MyArrayProtocol {
  var _bufferID: _BufferID {
    return unsafeBitCast(_owner, to: _BufferID.self)
  }
}
extension Array : MyArrayProtocol {}
extension ArraySlice : MyArrayProtocol {}
extension ContiguousArray : MyArrayProtocol {}

func checkReallocation<T : MyArrayProtocol>(
  _ x: T, _ lastBuffer: _BufferID, _ reallocationExpected: Bool
) -> _BufferID {
  let currentBuffer = x._bufferID
  if (currentBuffer != lastBuffer) != reallocationExpected {
    let message = reallocationExpected ? "lack of" : ""
    print("unexpected \(message) reallocation")
  }
  return currentBuffer
}

func checkEqual<
  S1 : Sequence, S2 : Sequence
>(_ a1: S1, _ a2: S2, _ expected: Bool)
where
S1.Iterator.Element == S2.Iterator.Element, 
S1.Iterator.Element : Equatable {
  if a1.elementsEqual(a2) != expected {
    let un = expected ? "un" : ""
    print("unexpectedly \(un)equal sequences!")
  }
}

func test<
  T : MyArrayProtocol
>(_: T.Type, _ label: String)
where
T.Element == LifetimeTracked,
T.Index == Int {
  print("test: \(label)...", terminator: "")

  var x: T = [
    LifetimeTracked(1),
    LifetimeTracked(2),
    LifetimeTracked(3),
    LifetimeTracked(4),
    LifetimeTracked(5)
  ]

  checkEqual(x, LifetimeTracked(1)...LifetimeTracked(5), true)

  x.reserveCapacity(x.count + 2)
  checkEqual(x, LifetimeTracked(1)...LifetimeTracked(5), true)

  let bufferId0 = x._bufferID

  // Append a range of integers
  x += LifetimeTracked(0)..<LifetimeTracked(2)
  let bufferId1 = checkReallocation(x, bufferId0, false)

  for _ in x.count..<(x.capacity + 1) {
    _ = checkReallocation(x, bufferId1, false)
    x.append(LifetimeTracked(13))
  }
  let bufferId2 = checkReallocation(x, bufferId1, true)

  let y = x
  x[x.index(before: x.endIndex)] = LifetimeTracked(17)
  _ = checkReallocation(x, bufferId2, true)
  checkEqual(x, y, false)

  func checkReallocations(
    _ a: T, _ growthDescription: String, _ growBy1: (_: inout T) -> ()
  ) {
    var a = a
    var reallocations = 0

    // Note: right now this test is dependent on a growth factor of 2.
    // It's possible that factor will change, but (cursory) testing
    // has shown that using 1.5, the other popular growth factor,
    // slows things down.
    for _ in a.count..<(a.capacity * 4) {
      let oldId = a._bufferID
      growBy1(&a)
      if oldId != a._bufferID {
        reallocations += 1
      }
    }

    if reallocations > 3 {
      print(
        "Unexpectedly found \(reallocations) reallocations "
        + "of \(label) when growing via \(growthDescription)")
    }
  }

  checkReallocations(x, "append") {
    (x: inout T) -> () in x.append(LifetimeTracked(42))
  }
  checkReallocations(x, "+=") {
    (x: inout T) -> () in x.append(LifetimeTracked(42))
  }
  print("done.")
}

print("testing...")
// CHECK: testing...

test(ContiguousArray<LifetimeTracked>.self, "ContiguousArray")
// CHECK-NEXT: test: ContiguousArray...done


test(Array<LifetimeTracked>.self, "Array")
// CHECK-NEXT: test: Array...done

test(ArraySlice<LifetimeTracked>.self, "ArraySlice")
// CHECK-NEXT: test: ArraySlice...done

func testAsArray() {
  print("== AsArray ==")
  var w: ContiguousArray<LifetimeTracked>
    = [LifetimeTracked(4), LifetimeTracked(2), LifetimeTracked(1)]
  // CHECK: == AsArray ==

  let x = ContiguousArray(w)
  print(w._bufferID == x._bufferID)
  // CHECK-NEXT: true

  let y = Array(x)
  print(x._bufferID == y._bufferID)
  // CHECK-NEXT: true

  // Because of their indirection, arrays of classes can share
  // buffers.
  let y1 = Array(y)
  print(y1._bufferID == y._bufferID)
  // CHECK-NEXT: true

  let z = ArraySlice(y)
  print(y._bufferID == z._bufferID)
  // CHECK-NEXT: true

  w = ContiguousArray(z)
  print(w._bufferID == z._bufferID)
  // CHECK-NEXT: true

  let zz = y[0..<2]
  print(zz._bufferID!)
  // CHECK-NEXT: 0x
}
testAsArray()

#if _runtime(_ObjC)
import Foundation

func nsArrayOfStrings() -> NSArray {
  let src: ContiguousArray<NSString> = ["foo", "bar", "baz"]

  return src.withUnsafeBufferPointer {
    return NSArray(
      objects: unsafeBitCast($0.baseAddress!,
        to: UnsafeMutablePointer<AnyObject>.self),
      count: $0.count)
  }
}

func swiftArrayWithNSArrayOfStrings() -> Array<NSString> {
  return nsArrayOfStrings() as! [NSString]
}

func testCocoa() {
  print("== Cocoa ==")
  // CHECK-objc: == Cocoa ==

  var a = swiftArrayWithNSArrayOfStrings()
  printSequence(a)
  // CHECK-objc-NEXT: [foo, bar, baz]

  a.append("qux")
  printSequence(a)
  // CHECK-objc-NEXT: [foo, bar, baz, qux]

  a = swiftArrayWithNSArrayOfStrings()
  printSequence(a)
  // CHECK-objc-NEXT: [foo, bar, baz]

  let b = a

  a[1] = "garply"
  printSequence(a)
  // CHECK-objc-NEXT: [foo, garply, baz]

  // Mutating an element in a has no effect on b
  printSequence(b)
  // CHECK-objc-NEXT: [foo, bar, baz]

  a = swiftArrayWithNSArrayOfStrings()
  a.insert("bag", at: 2)
  printSequence(a)
  // CHECK-objc-NEXT: [foo, bar, bag, baz]

  a = swiftArrayWithNSArrayOfStrings()
  a.reserveCapacity(30)
  printSequence(a)
  // CHECK-objc-NEXT: [foo, bar, baz]

  print(a.capacity >= 30)
  // CHECK-objc-NEXT: true

  // Prove that we create contiguous storage for an opaque NSArray
  a.withUnsafeBufferPointer {
    (p) -> () in
    print(p[0])
    // CHECK-objc-NEXT: foo
  }
}
testCocoa()
#endif // _runtime(_ObjC)

func testSlice() {
  print("== ArraySlice ==")
  // CHECK: == ArraySlice ==

  // do some tests on the shared semantics
  var b = ContiguousArray(LifetimeTracked(0)..<LifetimeTracked(10))

  // ArraySlice it
  var bSlice = b[3..<8]
  print("<\(bSlice.count)>")
  // CHECK-NEXT: <5>
  print("bSlice0: \(bSlice)")      // CHECK-NEXT: bSlice0: [3, 4, 5, 6, 7]

  // bSlice += LifetimeTracked(11)..<LifetimeTracked(13)

  // Writing into b does not change bSlice
  b[4] = LifetimeTracked(41)
  print("bSlice1: \(bSlice)")      // CHECK-NEXT: bSlice1: [3, 4, 5, 6, 7]

  // Writing into bSlice does not change b
  bSlice[3] = LifetimeTracked(32)

  print("bSlice2: \(bSlice)")     // CHECK-NEXT: bSlice2: [32, 4, 5, 6, 7]
  printSequence(b)                // CHECK-NEXT: [0, 1, 2, 3, 41, 5, 6, 7, 8, 9]

  let c = b
  b[b.startIndex..<b.endIndex].sort(by: <)
  printSequence(b)                // CHECK-NEXT: [0, 1, 2, 3, 5, 6, 7, 8, 9, 41]
  printSequence(c)                // CHECK-NEXT: [0, 1, 2, 3, 41, 5, 6, 7, 8, 9]

#if _runtime(_ObjC)
  // Now a bridged slice
  let a = Array<NSString>(_buffer: _ArrayBuffer(nsArray: nsArrayOfStrings()))

  printSequence(a)                // CHECK-objc-NEXT: [foo, bar, baz]

  var aSlice = a[1..<3]           // CHECK-objc-NEXT: [bar, baz]
  printSequence(aSlice)

  // Writing into aSlice works
  aSlice[1] = "buzz"              // CHECK-objc-NEXT: [buzz, baz]
  printSequence(aSlice)

  // ...and doesn't affect a
  printSequence(a)                // CHECK-objc-NEXT: [foo, bar, baz]

  // Appending to aSlice works...
  aSlice.append("fodder")
  print("<\(aSlice.count)>")      // CHECK-objc-NEXT: <3>
  printSequence(aSlice)           // CHECK-objc-NEXT: [buzz, baz, fodder]

  // And doesn't change a
  printSequence(a)                // CHECK-objc-NEXT: [foo, bar, baz]
#endif
}
testSlice()

//===--- sub-range replacement --------------------------------------------===//

// Size of the array on which we're going to test "replace."
// testing time grows roughly as the cube of this constant
let testWidth = 11

%arrayTypes = ['ContiguousArray', 'Array', 'ArraySlice']
%for A in arrayTypes:

func testReplace(_ make: @escaping () -> ${A}<LifetimeTracked>) {

  checkRangeReplaceable(
    make, { LifetimeTracked(100)..<LifetimeTracked(100 + $0) })
}

func testReplace${A}(
  makeOne: @escaping () -> ${A}<LifetimeTracked> = {
    var x = ${A}<LifetimeTracked>()
    // make sure some - but not all - replacements will have to grow the buffer
    x.reserveCapacity(testWidth * 3 / 2)
    x += LifetimeTracked(0)..<LifetimeTracked(testWidth)
    return x
  }
) {
  testReplace(makeOne)

  // Create one that will not be uniquely-referenced so we can test
  // the out-of-place code paths.
  let r = makeOne()
  testReplace({ r })

  // This test should ensure r's retain isn't dropped before we start testing.
  if (r.count != testWidth) {
    print("something bad happened!")
  }
}

print("testing subrange replacement in ${A}")
testReplace${A}()
%end

// Also test with a sub-slice of some larger buffer.  The "trailing"
// case is interesting because when the buffer is uniquely referenced
// we can expect to expand the slice in-place
for (maxValue, label) in [(testWidth, "trailing"), (testWidth*2, "interior")] {
  print("testing subrange replacement in \(label) Sub-ArraySlice")
  testReplaceArraySlice {
    var a = ContiguousArray(LifetimeTracked(-testWidth)..<LifetimeTracked(maxValue))
    a.reserveCapacity(a.count * 3 / 2)
    return a[testWidth..<(2 * testWidth)]
  }
}

// CHECK-NEXT: testing subrange replacement in ContiguousArray
// CHECK-NEXT: testing subrange replacement in Array
// CHECK-NEXT: testing subrange replacement in ArraySlice
// CHECK-NEXT: testing subrange replacement in trailing Sub-ArraySlice
// CHECK-NEXT: testing subrange replacement in interior Sub-ArraySlice

//===--- inout violations -------------------------------------------------===//

// The user has to obey certain rules when things are passed via
// inout, but in those cases we only guarantee memory-safety, not
// coherent semantics.  Let's try to force a memory-safety problem
// here.  This crashes when withUnsafeMutableBufferPointer is not
// sufficiently careful.
func testInoutViolation() {
  var a: [LifetimeTracked] = [10, 8, 6, 4, 2, 0, 9, 7, 5, 3, 1].map { LifetimeTracked($0) }

%for A in arrayTypes:
  do {
    var b = ${A}(a)
    _ = b.sorted { x, y in
      b.removeAll()
      return x < y
    }
  }
%end

  // An overload of sorted for Arrays uses withUnsafeMutableBufferPointer,
  // which disables bounds checks.
  _ = a.sorted { x, y in
    a = []         // Invalidate the whole array during sorting
    return x < y
  }
}
testInoutViolation()

//===--- single-element modifiers -----------------------------------------===//

%for A in arrayTypes:

func testSingleElementModifiers${A}() {
  print("testing ${A} single-argument modifiers")
  // CHECK-NEXT: testing ${A} single-argument modifiers

  var a = ${A}(LifetimeTracked(0)..<LifetimeTracked(10))
  print(a.removeLast().value)     // CHECK-NEXT: 9
  printSequence(a)               // CHECK-NEXT: [0, 1, 2, 3, 4, 5, 6, 7, 8]

  a.insert(LifetimeTracked(42), at: 4)
  printSequence(a)               // CHECK-NEXT: [0, 1, 2, 3, 42, 4, 5, 6, 7, 8]

  print(a.remove(at: 2).value) // CHECK-NEXT: 2
  printSequence(a)                  // CHECK-NEXT: [0, 1, 3, 42, 4, 5, 6, 7, 8]
}
testSingleElementModifiers${A}()
%end

//===--- isEmpty, first, last ---------------------------------------------===//

%for A in arrayTypes:

func testIsEmptyFirstLast${A}() {
  print("testing ${A} isEmpty, first, and last")
  // CHECK-NEXT: testing ${A} isEmpty, first, and last

  print(${A}<Int>().isEmpty)          // CHECK-NEXT: true
  print(${A}(42...42).isEmpty)   // CHECK-NEXT: false

  print("<\(${A}(3..<43).first!)>")  // CHECK-NEXT: <3>
  print("<\(${A}(3..<43).last!)>")   // CHECK-NEXT: <42>

  print("<\(String(describing: ${A}<Int>().first))>")    // CHECK-NEXT: nil
  print("<\(String(describing:${A}<Int>().last))>")     // CHECK-NEXT: nil

  var a = ${A}(LifetimeTracked(0)..<LifetimeTracked(10))
  print(a.removeLast().value)     // CHECK-NEXT: 9
  printSequence(a)               // CHECK-NEXT: [0, 1, 2, 3, 4, 5, 6, 7, 8]

  a.insert(LifetimeTracked(42), at: 4)
  printSequence(a)               // CHECK-NEXT: [0, 1, 2, 3, 42, 4, 5, 6, 7, 8]

  print(a.remove(at: 2).value) // CHECK-NEXT: 2
  printSequence(a)                  // CHECK-NEXT: [0, 1, 3, 42, 4, 5, 6, 7, 8]
}
testIsEmptyFirstLast${A}()
%end

//===--- Regression Tests -------------------------------------------------===//
func rdar16958865() {
  var a: [Int] = []
  a += AnySequence([ 42, 4242 ])
  // CHECK-NEXT: [42, 4242]
  print(a)
}
rdar16958865()

#if _runtime(_ObjC)
#if os(OSX)
import AppKit
typealias OSColor = NSColor
#else
import UIKit
typealias OSColor = UIColor
#endif

class Rdar16914909 : NSObject {
  var basicColorSet = [OSColor]()

  func doColorStuff() {
    basicColorSet.append(OSColor.lightGray)
    print("appended")
  }
}

Rdar16914909().doColorStuff()
// CHECK-objc-NEXT: appended
#endif

print("leaks = \(LifetimeTracked.instances)")
// CHECK-NEXT: leaks = 0

// CHECK-NEXT: all done.
print("all done.")

// ${'Local Variables'}:
// eval: (read-only-mode 1)
// End: