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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
93 lines
2.0 KiB
C++
93 lines
2.0 KiB
C++
#ifndef TEST_INTEROP_CXX_CLASS_INPUTS_CONSTRUCTORS_H
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#define TEST_INTEROP_CXX_CLASS_INPUTS_CONSTRUCTORS_H
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struct ExplicitDefaultConstructor {
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ExplicitDefaultConstructor() : x(42) {}
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int x;
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};
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struct ImplicitDefaultConstructor {
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int x = 42;
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};
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struct DefaultedDefaultConstructor {
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int x = 42;
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DefaultedDefaultConstructor() = default;
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};
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struct MemberOfClassType {
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ImplicitDefaultConstructor member;
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};
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struct DefaultConstructorDeleted {
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DefaultConstructorDeleted() = delete;
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int &a;
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};
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struct ConstructorWithParam {
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ConstructorWithParam(int val) : x(val + 42) {}
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int x;
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};
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struct CopyAndMoveConstructor {
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CopyAndMoveConstructor(const CopyAndMoveConstructor &) = default;
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CopyAndMoveConstructor(CopyAndMoveConstructor &&) = default;
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int value = 123;
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int *ptr = nullptr;
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};
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struct Base {};
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struct ArgType {
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int i = 42;
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};
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struct HasVirtualBase : public virtual Base {
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HasVirtualBase() = delete;
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HasVirtualBase(ArgType Arg) {}
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int i;
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};
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struct EmptyStruct {};
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struct IntWrapper {
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int x;
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};
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struct TemplatedConstructor {
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ArgType value;
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template<class T>
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TemplatedConstructor(T value) : value(value) { }
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};
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struct TemplatedConstructorWithExtraArg {
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template<class T>
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TemplatedConstructorWithExtraArg(int, T value) { }
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template<class T>
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TemplatedConstructorWithExtraArg(T value, int) { }
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template<class T, class U>
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TemplatedConstructorWithExtraArg(T value, U other) { }
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};
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struct __attribute__((swift_attr("import_unsafe")))
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HasUserProvidedCopyConstructor {
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int numCopies;
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HasUserProvidedCopyConstructor(int numCopies = 0) : numCopies(numCopies) {}
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HasUserProvidedCopyConstructor(const HasUserProvidedCopyConstructor &other)
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: numCopies(other.numCopies + 1) {}
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};
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struct DeletedCopyConstructor {
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DeletedCopyConstructor(const DeletedCopyConstructor &) = delete;
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};
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#ifdef ENABLE_PTRAUTH
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struct HasPtrAuthMember {
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void (*__ptrauth(1, 1, 3) handler)();
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};
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#endif
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#endif // TEST_INTEROP_CXX_CLASS_INPUTS_CONSTRUCTORS_H
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