swift-mirror/test/Casting/CastTraps.swift.gyb

// -*- swift -*-
// RUN: %target-run-simple-swiftgyb
// REQUIRES: executable_test

// FIXME: Casting.cpp has dozens of places to fail a cast. This test does not
// attempt to enumerate them all.

import StdlibUnittest

#if _runtime(_ObjC)
import Foundation
#endif


% types = []
% objectTypes = []
% protocolTypes = []
% ObjCTypes = []

% types.append(['main.Class1', 'main.Class2'])
% objectTypes.append(['main.Class1', 'main.Class2'])
class Class1 { }
class Class2 { }

% types.append(['main.Struct1', 'main.Struct2'])
struct Struct1 { }
struct Struct2 { }

% types.append(['main.ObjCClass1', 'main.ObjCClass2'])
% objectTypes.append(['main.ObjCClass1', 'main.ObjCClass2'])
% ObjCTypes.extend(['main.ObjCClass1', 'main.ObjCClass2'])
#if _runtime(_ObjC)
class ObjCClass1 : NSObject { }
class ObjCClass2 : NSObject { }
#endif

% types.append(['DateFormatter', 'NumberFormatter'])
% objectTypes.append(['DateFormatter', 'NumberFormatter'])
% ObjCTypes.extend(['DateFormatter', 'NumberFormatter'])
// non-Swift Objective-C class

% protocolTypes.append('main.Proto1')
% protocolTypes.append('main.Proto2')
protocol Proto1 { }
protocol Proto2 { }
% protocolTypes.append('URLSessionDelegate')
% ObjCTypes.append('URLSessionDelegate')
// non-Swift Objective-C protocol


var CastTrapsTestSuite = TestSuite("CastTraps")

// Test `(T1() as Any) as T2` cast failure
// for all type pairs.

% for (t1, _) in types:
%   for (_, t2) in types:

%     if t1 not in ObjCTypes and t2 not in ObjCTypes:
CastTrapsTestSuite.test("${t1}__${t2}")
  .skip(.custom(
    { _isFastAssertConfiguration() },
    reason: "this trap is not guaranteed to happen in -Ounchecked"))
  .crashOutputMatches("Could not cast value of type '")
  .crashOutputMatches("${t1}' ")
  .crashOutputMatches(" to '")
  .crashOutputMatches("${t2}'")
  .code
{
  let o = ${t1}() as Any
  expectCrashLater()
  let r = o as! ${t2}
  _blackHole(r)
}

%     end
%   end
% end

// Test `(T1() as AnyObject) as T2` cast failure
// for object type to protocol type pairs

% for (t1, _) in objectTypes:
%   for (t2) in protocolTypes:

%     if t1 not in ObjCTypes and t2 not in ObjCTypes:
CastTrapsTestSuite.test("${t1}__${t2}")
  .skip(.custom(
    { _isFastAssertConfiguration() },
    reason: "this trap is not guaranteed to happen in -Ounchecked"))
  .crashOutputMatches("Could not cast value of type '")
  .crashOutputMatches("${t1}' ")
  .crashOutputMatches(" to '")
  .crashOutputMatches("${t2}'")
  .code
{
  let o = ${t1}() as AnyObject
  expectCrashLater()
  let r = o as! ${t2}
  _blackHole(r)
}

%     end
%   end
% end

protocol P2 {}
if #available(SwiftStdlib 6.0, *) {
CastTrapsTestSuite.test("Unexpected null")
  .crashOutputMatches("Found a null pointer in a value of type '")
  .crashOutputMatches("Foo'")
  .crashOutputMatches("(Detected while casting to '")
  .crashOutputMatches("P2'")
  .code
{
  class Foo {}
  let n = UnsafeRawPointer(bitPattern: 0)
  var o: Foo = unsafeBitCast(n, to: Foo.self)
  let r = o as Any
  expectCrashLater()
  let s = r as? P2
  _blackHole(s)
}
}


#if _runtime(_ObjC)
if #available(SwiftStdlib 6.0, *) {
CastTrapsTestSuite.test("Unexpected Obj-C null")
  .crashOutputMatches("Found a null pointer in a value of type 'NSObject'")
  .crashOutputMatches("(Detected while casting to '")
  .crashOutputMatches("P2'")
  .code
{
  let n = UnsafeRawPointer(bitPattern: 0)
  var o: NSObject = unsafeBitCast(n, to: NSObject.self)
  let r = o as Any
  expectCrashLater()
  let s = r as? P2
  _blackHole(s)
}
}
#endif

class Base {}
final class Derived: Base {}
final class Other: Base {}

@inline(never)
func getDerived(_ v: Base) -> Derived {
  return v as! Derived
}

@inline(never)
func getDerivedFromOptional(_ v: Base?) -> Derived {
  return v as! Derived
}

CastTrapsTestSuite.test("unconditinal fast class cast") {
  let c = Other()
  expectCrashLater()
  _ = getDerived(c)
}

CastTrapsTestSuite.test("unconditinal optional fast class cast") {
  let c = Other()
  expectCrashLater()
  _ = getDerivedFromOptional(c)
}

CastTrapsTestSuite.test("unconditinal optional nil fast class cast") {
  expectCrashLater()
  _ = getDerivedFromOptional(nil)
}

runAllTests()