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bac5d0e9a1
When Swift imports C structs, it synthesizes an initializer that takes no arguments and zero-initializes the C struct. When C++ interop is enabled, Clang treats all C structs as if they were C++ structs. This means that some of the C structs will get a default constructor implicitly generated by Clang. This implicit default constructor will not zero-initialize trivial fields of the struct. This is a common source of confusion and subtle bugs for developers who try to enable C++ interop in existing projects that use C interop and rely on zero-initialization of C structs. rdar://115909532
64 lines
2.2 KiB
Swift
64 lines
2.2 KiB
Swift
// RUN: %target-swift-ide-test -print-module -module-to-print=Constructors -I %S/Inputs/ -source-filename=x -enable-experimental-cxx-interop | %FileCheck %s
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// CHECK: struct ExplicitDefaultConstructor {
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// CHECK-NEXT: init()
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// CHECK-NEXT: var x: Int32
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// CHECK-NEXT: }
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// CHECK-NEXT: struct ImplicitDefaultConstructor {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(x: Int32)
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// CHECK-NEXT: var x: Int32
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// CHECK-NEXT: }
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// CHECK-NEXT: struct DefaultedDefaultConstructor {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(x: Int32)
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// CHECK-NEXT: var x: Int32
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// CHECK-NEXT: }
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// CHECK-NEXT: struct MemberOfClassType {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(member: ImplicitDefaultConstructor)
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// CHECK-NEXT: var member: ImplicitDefaultConstructor
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// CHECK-NEXT: }
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// CHECK-NEXT: struct DefaultConstructorDeleted {
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// CHECK-NEXT: init(a: UnsafeMutablePointer<Int32>)
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// CHECK-NEXT: var a: UnsafeMutablePointer<Int32>
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// CHECK-NEXT: }
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// CHECK-NEXT: struct ConstructorWithParam {
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// CHECK-NEXT: init(_ val: Int32)
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// CHECK-NEXT: @available(*, deprecated, message
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// CHECK-NEXT: init()
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// CHECK-NEXT: var x: Int32
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// CHECK-NEXT: }
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// CHECK-NEXT: struct CopyAndMoveConstructor {
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// CHECK-NEXT: @available(*, deprecated, message
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(value: Int32, ptr: UnsafeMutablePointer<Int32>!)
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// CHECK-NEXT: var value: Int32
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// CHECK-NEXT: var ptr: UnsafeMutablePointer<Int32>!
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// CHECK-NEXT: }
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// CHECK-NEXT: struct Base {
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// CHECK-NEXT: init()
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// CHECK-NEXT: }
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// CHECK-NEXT: struct ArgType {
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// CHECK-NEXT: init()
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// CHECK-NEXT: init(i: Int32)
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// CHECK-NEXT: var i: Int32
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// CHECK-NEXT: }
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// CHECK-NEXT: struct HasVirtualBase {
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// CHECK-NEXT: init(_ Arg: ArgType)
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// CHECK-NEXT: var i: Int32
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// CHECK-NEXT: }
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// CHECK: struct TemplatedConstructor {
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// CHECK-NEXT: init<T>(_ value: T)
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// CHECK-NEXT: @available(*, deprecated, message
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// CHECK-NEXT: init()
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// CHECK-NEXT: var value: ArgType
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// CHECK-NEXT: }
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// CHECK: struct TemplatedConstructorWithExtraArg {
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// CHECK-NEXT: init<T>(_: Int32, _ value: T)
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// CHECK-NEXT: init<T>(_ value: T, _: Int32)
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// CHECK-NEXT: init<T, U>(_ value: T, _ other: U)
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// CHECK-NEXT: @available(*, deprecated, message
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// CHECK-NEXT: init()
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// CHECK-NEXT: }
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