// RUN: %empty-directory(%t)

// RUN: %gyb -DOPT_KIND=None %s -o %t/pointer_conversion.swift
// RUN: %line-directive %t/pointer_conversion.swift -- %target-swift-frontend -typecheck -verify %t/pointer_conversion.swift

// RUN: %gyb -DOPT_KIND=Optional %s -o %t/pointer_conversion_opt.swift
// RUN: %line-directive %t/pointer_conversion_opt.swift -- %target-swift-frontend -typecheck -verify %t/pointer_conversion_opt.swift

// RUN: %gyb -DOPT_KIND=ImplicitlyUnwrappedOptional %s -o %t/pointer_conversion_iuo.swift
// RUN: %line-directive %t/pointer_conversion_iuo.swift -- %target-swift-frontend -typecheck -verify %t/pointer_conversion_iuo.swift

%{
if OPT_KIND == 'Optional':
  suffix='?'
elif OPT_KIND == 'ImplicitlyUnwrappedOptional':
  suffix='!'
else:
  suffix=''
}%

class C {}
class D {}

func takesMutablePointer(_ x: UnsafeMutablePointer<Int>${suffix}) {}
func takesMutableVoidPointer(_ x: UnsafeMutableRawPointer${suffix}) {}
func takesMutableRawPointer(_ x: UnsafeMutableRawPointer${suffix}) {}
func takesMutableInt8Pointer(_ x: UnsafeMutablePointer<Int8>${suffix}) {}
func takesMutableArrayPointer(_ x: UnsafeMutablePointer<[Int]>${suffix}) {}
@discardableResult
func takesConstPointer(_ x: UnsafePointer<Int>${suffix}) -> Character { return "x" }
func takesConstInt8Pointer(_ x: UnsafePointer<Int8>${suffix}) {}
func takesConstUInt8Pointer(_ x: UnsafePointer<UInt8>${suffix}) {}
func takesConstVoidPointer(_ x: UnsafeRawPointer${suffix}) {}
func takesConstRawPointer(_ x: UnsafeRawPointer${suffix}) {}

func mutablePointerArguments(_ p: UnsafeMutablePointer<Int>,
                             cp: UnsafePointer<Int>) {
  takesMutablePointer(nil)
% if not suffix:
  // expected-error@-2 {{'nil' is not compatible with expected argument type}}
% end

  takesMutablePointer(p)
  takesMutablePointer(cp) // expected-error{{cannot convert value of type 'UnsafePointer<Int>' to expected argument type 'UnsafeMutablePointer<Int>'}}
  var i: Int = 0
  var f: Float = 0
  takesMutablePointer(&i)
  takesMutablePointer(&f) // expected-error{{cannot convert value of type 'UnsafeMutablePointer<Float>' to expected argument type 'UnsafeMutablePointer<Int>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('Float' and 'Int') are expected to be equal}}
  takesMutablePointer(i) // expected-error{{cannot convert value of type 'Int' to expected argument type 'UnsafeMutablePointer<Int>'}}
  takesMutablePointer(f) // expected-error{{cannot convert value of type 'Float' to expected argument type 'UnsafeMutablePointer<Int>'}}
  var ii: [Int] = [0, 1, 2]
  var ff: [Float] = [0, 1, 2]
  takesMutablePointer(&ii)
  takesMutablePointer(&ff) // expected-error{{cannot convert value of type 'UnsafeMutablePointer<Float>' to expected argument type 'UnsafeMutablePointer<Int>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('Float' and 'Int') are expected to be equal}}
  takesMutablePointer(ii) // expected-error{{cannot convert value of type '[Int]' to expected argument type 'UnsafeMutablePointer<Int>'}}
  takesMutablePointer(ff) // expected-error{{cannot convert value of type '[Float]' to expected argument type 'UnsafeMutablePointer<Int>'}}

  takesMutableArrayPointer(&i) // expected-error{{cannot convert value of type 'UnsafeMutablePointer<Int>' to expected argument type 'UnsafeMutablePointer<[Int]>'}}
  //expected-note@-1 {{arguments to generic parameter 'Pointee' ('Int' and '[Int]') are expected to be equal}}
  takesMutableArrayPointer(&ii)

  // We don't allow these conversions outside of function arguments.
  var x: UnsafeMutablePointer<Int> = &i // expected-error {{'&' may only be used to pass an argument to inout parameter}}
  x = &ii // expected-error {{'&' may only be used to pass an argument to inout parameter}}
  _ = x
}

func mutableVoidPointerArguments(_ p: UnsafeMutablePointer<Int>,
                                 cp: UnsafePointer<Int>,
                                 fp: UnsafeMutablePointer<Float>) {
  takesMutableVoidPointer(nil)
% if not suffix:
  // expected-error@-2 {{'nil' is not compatible with expected argument type}}
% end

  takesMutableVoidPointer(p)
  takesMutableVoidPointer(fp)
  takesMutableVoidPointer(cp) // expected-error{{cannot convert value of type 'UnsafePointer<Int>' to expected argument type 'UnsafeMutableRawPointer'}}
  var i: Int = 0
  var f: Float = 0
  takesMutableVoidPointer(&i)
  takesMutableVoidPointer(&f)
  takesMutableVoidPointer(i) // expected-error{{cannot convert value of type 'Int' to expected argument type 'UnsafeMutableRawPointer'}}
  takesMutableVoidPointer(f) // expected-error{{cannot convert value of type 'Float' to expected argument type 'UnsafeMutableRawPointer'}}
  var ii: [Int] = [0, 1, 2]
  var dd: [CInt] = [1, 2, 3]
  var ff: [Int] = [0, 1, 2]
  takesMutableVoidPointer(&ii)
  takesMutableVoidPointer(&dd)
  takesMutableVoidPointer(&ff)
  takesMutableVoidPointer(ii) // expected-error{{cannot convert value of type '[Int]' to expected argument type 'UnsafeMutableRawPointer'}}
  takesMutableVoidPointer(ff) // expected-error{{cannot convert value of type '[Int]' to expected argument type 'UnsafeMutableRawPointer'}}

  // We don't allow these conversions outside of function arguments.
  var x: UnsafeMutableRawPointer = &i // expected-error {{'&' may only be used to pass an argument to inout parameter}}
  x = p // expected-error{{cannot assign value of type 'UnsafeMutablePointer<Int>' to type 'UnsafeMutableRawPointer'}}
  x = &ii // expected-error {{'&' may only be used to pass an argument to inout parameter}}
  _ = x
}

func mutableRawPointerArguments(_ p: UnsafeMutablePointer<Int>,
                                cp: UnsafePointer<Int>,
                                fp: UnsafeMutablePointer<Float>,
                                rp: UnsafeRawPointer) {
  takesMutableRawPointer(nil)
% if not suffix:
  // expected-error@-2 {{'nil' is not compatible with expected argument type}}
% end

  takesMutableRawPointer(p)
  takesMutableRawPointer(fp)
  takesMutableRawPointer(cp) // expected-error{{cannot convert value of type 'UnsafePointer<Int>' to expected argument type 'UnsafeMutableRawPointer'}}
  takesMutableRawPointer(rp) // expected-error{{cannot convert value of type 'UnsafeRawPointer' to expected argument type 'UnsafeMutableRawPointer'}}
  var i: Int = 0
  var f: Float = 0
  takesMutableRawPointer(&i)
  takesMutableRawPointer(&f)
  takesMutableRawPointer(i) // expected-error{{cannot convert value of type 'Int' to expected argument type 'UnsafeMutableRawPointer'}}
  takesMutableRawPointer(f) // expected-error{{cannot convert value of type 'Float' to expected argument type 'UnsafeMutableRawPointer'}}
  var ii: [Int] = [0, 1, 2]
  var dd: [CInt] = [1, 2, 3]
  var ff: [Int] = [0, 1, 2]
  takesMutableRawPointer(&ii)
  takesMutableRawPointer(&dd)
  takesMutableRawPointer(&ff)
  takesMutableRawPointer(ii) // expected-error{{cannot convert value of type '[Int]' to expected argument type 'UnsafeMutableRawPointer'}}
  takesMutableRawPointer(ff) // expected-error{{cannot convert value of type '[Int]' to expected argument type 'UnsafeMutableRawPointer'}}

  // We don't allow these conversions outside of function arguments.
  var x: UnsafeMutableRawPointer = &i // expected-error {{'&' may only be used to pass an argument to inout parameter}}
  x = p // expected-error{{cannot assign value of type 'UnsafeMutablePointer<Int>' to type 'UnsafeMutableRawPointer'}}
  x = &ii //expected-error {{'&' may only be used to pass an argument to inout parameter}}
  _ = x
}

func constPointerArguments(_ p: UnsafeMutablePointer<Int>,
                           cp: UnsafePointer<Int>) {
  takesConstPointer(nil)
% if not suffix:
  // expected-error@-2 {{'nil' is not compatible with expected argument type}}
% end

  takesConstPointer(p)
  takesConstPointer(cp)

  var i: Int = 0
  var f: Float = 0
  takesConstPointer(&i)
  takesConstPointer(&f) // expected-error{{cannot convert value of type 'UnsafePointer<Float>' to expected argument type 'UnsafePointer<Int>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('Float' and 'Int') are expected to be equal}}
  var ii: [Int] = [0, 1, 2]
  var ff: [Float] = [0, 1, 2]
  takesConstPointer(&ii)
  takesConstPointer(&ff) // expected-error{{cannot convert value of type 'UnsafePointer<Float>' to expected argument type 'UnsafePointer<Int>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('Float' and 'Int') are expected to be equal}}
  takesConstPointer(ii)
  takesConstPointer(ff) // expected-error{{cannot convert value of type 'UnsafePointer<Float>' to expected argument type 'UnsafePointer<Int>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('Float' and 'Int') are expected to be equal}}
  takesConstPointer([0, 1, 2])
  // <rdar://problem/22308330> QoI: CSDiags doesn't handle array -> pointer impl conversions well
  takesConstPointer([0.0, 1.0, 2.0])
  // expected-error@-1 3 {{cannot convert value of type 'Double' to expected element type 'Int'}}

  // We don't allow these conversions outside of function arguments.
  var x: UnsafePointer<Int> = &i // expected-error {{'&' may only be used to pass an argument to inout parameter}}
  x = ii // expected-error{{cannot assign value of type '[Int]' to type 'UnsafePointer<Int>'}}
  x = p // expected-error{{cannot assign value of type 'UnsafeMutablePointer<Int>' to type 'UnsafePointer<Int>'}}
}

func constVoidPointerArguments(_ p: UnsafeMutablePointer<Int>,
                               fp: UnsafeMutablePointer<Float>,
                               cp: UnsafePointer<Int>,
                               cfp: UnsafePointer<Float>) {
  takesConstVoidPointer(nil)
% if not suffix:
  // expected-error@-2 {{'nil' is not compatible with expected argument type}}
% end

  takesConstVoidPointer(p)
  takesConstVoidPointer(fp)
  takesConstVoidPointer(cp)
  takesConstVoidPointer(cfp)

  var i: Int = 0
  var f: Float = 0
  takesConstVoidPointer(&i)
  takesConstVoidPointer(&f)
  var ii: [Int] = [0, 1, 2]
  var ff: [Float] = [0, 1, 2]
  takesConstVoidPointer(&ii)
  takesConstVoidPointer(&ff)
  takesConstVoidPointer(ii)
  takesConstVoidPointer(ff)

  takesConstVoidPointer([0, 1, 2])
  takesConstVoidPointer([0.0, 1.0, 2.0])

  // We don't allow these conversions outside of function arguments.
  var x: UnsafeRawPointer = &i // expected-error {{'&' may only be used to pass an argument to inout parameter}}
  x = ii // expected-error{{cannot assign value of type '[Int]' to type 'UnsafeRawPointer'}}
  x = p // expected-error{{cannot assign value of type 'UnsafeMutablePointer<Int>' to type 'UnsafeRawPointer'}}
  x = fp // expected-error{{cannot assign value of type 'UnsafeMutablePointer<Float>' to type 'UnsafeRawPointer'}}
  x = cp // expected-error{{cannot assign value of type 'UnsafePointer<Int>' to type 'UnsafeRawPointer'}}
  x = cfp // expected-error{{cannot assign value of type 'UnsafePointer<Float>' to type 'UnsafeRawPointer'}}
  _ = x
}

func constRawPointerArguments(_ p: UnsafeMutablePointer<Int>,
                               fp: UnsafeMutablePointer<Float>,
                               cp: UnsafePointer<Int>,
                               cfp: UnsafePointer<Float>,
                               mrp: UnsafeMutableRawPointer) {
  takesConstRawPointer(nil)
% if not suffix:
  // expected-error@-2 {{'nil' is not compatible with expected argument type}}
% end

  takesConstRawPointer(p)
  takesConstRawPointer(fp)
  takesConstRawPointer(cp)
  takesConstRawPointer(cfp)
  takesConstRawPointer(mrp)

  var i: Int = 0
  var f: Float = 0
  takesConstRawPointer(&i)
  takesConstRawPointer(&f)
  var ii: [Int] = [0, 1, 2]
  var ff: [Float] = [0, 1, 2]
  takesConstRawPointer(&ii)
  takesConstRawPointer(&ff)
  takesConstRawPointer(ii)
  takesConstRawPointer(ff)

  takesConstRawPointer([0, 1, 2])
  takesConstRawPointer([0.0, 1.0, 2.0])

  // We don't allow these conversions outside of function arguments.
  var x: UnsafeRawPointer = &i // expected-error {{'&' may only be used to pass an argument to inout parameter}}
  x = ii // expected-error{{cannot assign value of type '[Int]' to type 'UnsafeRawPointer'}}
  x = p // expected-error{{cannot assign value of type 'UnsafeMutablePointer<Int>' to type 'UnsafeRawPointer'}}
  x = fp // expected-error{{cannot assign value of type 'UnsafeMutablePointer<Float>' to type 'UnsafeRawPointer'}}
  x = cp // expected-error{{cannot assign value of type 'UnsafePointer<Int>' to type 'UnsafeRawPointer'}}
  x = cfp // expected-error{{cannot assign value of type 'UnsafePointer<Float>' to type 'UnsafeRawPointer'}}
  _ = x
}

func stringArguments(_ s: String) {
  var s = s
  takesConstVoidPointer(s)
  takesConstRawPointer(s)
  takesConstInt8Pointer(s)
  takesConstUInt8Pointer(s)
  takesConstPointer(s) // expected-error{{cannot convert value of type 'String' to expected argument type 'UnsafePointer<Int>'}}

  takesMutableVoidPointer(s) // expected-error{{cannot convert value of type 'String' to expected argument type 'UnsafeMutableRawPointer'}}
  takesMutableRawPointer(s) // expected-error{{cannot convert value of type 'String' to expected argument type 'UnsafeMutableRawPointer'}}
  takesMutableInt8Pointer(s) // expected-error{{cannot convert value of type 'String' to expected argument type 'UnsafeMutablePointer<Int8>'}}
  takesMutableInt8Pointer(&s) // expected-error{{cannot convert value of type 'UnsafeMutablePointer<String>' to expected argument type 'UnsafeMutablePointer<Int8>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('String' and 'Int8') are expected to be equal}}
  takesMutablePointer(s) // expected-error{{cannot convert value of type 'String' to expected argument type 'UnsafeMutablePointer<Int>'}}
  takesMutablePointer(&s) // expected-error{{cannot convert value of type 'UnsafeMutablePointer<String>' to expected argument type 'UnsafeMutablePointer<Int>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('String' and 'Int') are expected to be equal}}
}


func optionality(_ op: UnsafeMutablePointer<Float>?) {
  takesMutableVoidPointer(op)
% if not suffix:
  // expected-error@-2 {{value of optional type 'UnsafeMutablePointer<Float>?' must be unwrapped}}
  // expected-note@-3{{coalesce}}
  // expected-note@-4{{force-unwrap}}
% end

  takesConstVoidPointer(op)
% if not suffix:
  // expected-error@-2 {{value of optional type 'UnsafeMutablePointer<Float>?' must be unwrapped}}
  // expected-note@-3{{coalesce}}
  // expected-note@-4{{force-unwrap}}
% end
}

func pointerArithmetic(_ x: UnsafeMutablePointer<Int>, y: UnsafeMutablePointer<Int>,
                       i: Int) {
  _ = x + i
  _ = x - y
}

func genericPointerArithmetic<T>(_ x: UnsafeMutablePointer<T>, i: Int, t: T) -> UnsafeMutablePointer<T> {
  let p = x + i
  p.initialize(to: t)
}

func passPointerToClosure(_ f: (UnsafeMutablePointer<Int>) -> Int) -> Int { }

func pointerInClosure(_ f: (UnsafePointer<Int>) -> Int) -> Int {
  return passPointerToClosure { f($0) }
}

struct NotEquatable {}

func arrayComparison(_ x: [NotEquatable], y: [NotEquatable], p: UnsafeMutablePointer<NotEquatable>) {
  var x = x
  // Don't allow implicit array-to-pointer conversions in operators.
  // There is a note attached to declaration - requirement from conditional conformance of '[NotEquatable]' to 'Equatable'
  let a: Bool = x == y // expected-error{{operator function '==' requires that 'NotEquatable' conform to 'Equatable'}}
  let _: Bool = p == &x  // Allowed!
}

func addressConversion(p: UnsafeMutablePointer<Int>, x: Int) {
  var x = x
  let _: Bool = p == &x
}

// <rdar://problem/19478919> QoI: poor error: '&' used with non-inout argument of type 'UnsafeMutablePointer<Int32>'
func f19478919() {
  var viewport: Int = 1 // intentionally incorrect type, not Int32
  func GLKProject(_ a : UnsafeMutablePointer<Int32>) {}
  GLKProject(&viewport)  // expected-error {{cannot convert value of type 'UnsafeMutablePointer<Int>' to expected argument type 'UnsafeMutablePointer<Int32>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('Int' and 'Int32') are expected to be equal}}

  func GLKProjectUP(_ a : UnsafePointer<Int32>) {}
  func UP_Void(_ a : UnsafeRawPointer) {}
  func UMP_Void(_ a : UnsafeMutableRawPointer) {}
  UP_Void(&viewport)
  UMP_Void(&viewport)

  let cst = 42  // expected-note 2 {{change 'let' to 'var' to make it mutable}}
  UP_Void(&cst)  // expected-error {{cannot pass immutable value as inout argument: 'cst' is a 'let' constant}}
  UMP_Void(&cst)  // expected-error {{cannot pass immutable value as inout argument: 'cst' is a 'let' constant}}
}

// <rdar://problem/23202128> QoI: Poor diagnostic with let vs. var passed to C function
func f23202128() {
  func UP(_ p: UnsafePointer<Int32>) {}
  func UMP(_ p: UnsafeMutablePointer<Int32>) {}

  let pipe: [Int32] = [0, 0]  // expected-note {{change 'let' to 'var' to make it mutable}}}}
  UMP(&pipe)  // expected-error {{cannot pass immutable value as inout argument: 'pipe' is a 'let' constant}}

  var pipe2: [Int] = [0, 0]
  UMP(&pipe2) // expected-error {{cannot convert value of type 'UnsafeMutablePointer<Int>' to expected argument type 'UnsafeMutablePointer<Int32>'}}
  // expected-note@-1 {{arguments to generic parameter 'Pointee' ('Int' and 'Int32') are expected to be equal}}


  UP(pipe)    // ok
  UP(&pipe)   // expected-error {{'&' is not allowed passing array value as 'UnsafePointer<Int32>' argument}} {{6-7=}}
}

func takesRawBuffer(_ b: UnsafeRawBufferPointer) {}

// <rdar://problem/29586888> UnsafeRawBufferPointer range subscript is inconsistent with Collection.
func f29586888(b: UnsafeRawBufferPointer) {
  takesRawBuffer(b[1..<2]) // expected-error {{'subscript(_:)' is unavailable: use 'UnsafeRawBufferPointer(rebasing:)' to convert a slice into a zero-based raw buffer.}}
  let slice = b[1..<2]
  takesRawBuffer(slice) // expected-error {{cannot convert value of type 'UnsafeRawBufferPointer.SubSequence' (aka 'Slice<UnsafeRawBufferPointer>') to expected argument type 'UnsafeRawBufferPointer'}}
}