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/*
* Copyright (c) 2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/StdLibExtras.h>
/*
A system of macros to make it more ergonomic to implement C++ class member functions in Swift.
Use HAS_SWIFTCXX_THUNK (from wtf/Compiler.h) in headers, to mark a C++ member function as having
a specialized definition in Swift.
Use DEFINE_SWIFTCXX_THUNK in implementation sources, to define a function that calls through to a
"<Class>_<Member>_thunk" free function. These functions are expected to be implemented in Swift and
available through reverse interop.
*/
#define _WTF_REMOVE_PARENTHESIS(X) _WTF_REMOVE_PARENTHESIS_IMPL X
#define _WTF_REMOVE_PARENTHESIS_IMPL(...) __VA_ARGS__
#define _DEFINE_SWIFTCXX_THUNK0(Class, Member, ReturnType) \
ReturnType Class::Member() { \
return WTF_CONCAT(Class, _##Member##_thunk)(this); \
}
#define _DEFINE_SWIFTCXX_THUNK1(Class, Member, ReturnType, TypeOfArg1) \
ReturnType Class::Member(_WTF_REMOVE_PARENTHESIS((TypeOfArg1)) arg1) { \
return WTF_CONCAT(Class, _##Member##_thunk)(this, arg1); \
}
#define _DEFINE_SWIFTCXX_THUNK2(Class, Member, ReturnType, TypeOfArg1, TypeOfArg2) \
ReturnType Class::Member(_WTF_REMOVE_PARENTHESIS((TypeOfArg1)) arg1, _WTF_REMOVE_PARENTHESIS((TypeOfArg2)) arg2) { \
return WTF_CONCAT(Class, _##Member##_thunk)(this, arg1, arg2); \
}
#define _DEFINE_SWIFTCXX_THUNK3(Class, Member, ReturnType, TypeOfArg1, TypeOfArg2, TypeOfArg3) \
ReturnType Class::Member(_WTF_REMOVE_PARENTHESIS((TypeOfArg1)) arg1, _WTF_REMOVE_PARENTHESIS((TypeOfArg2)) arg2, _WTF_REMOVE_PARENTHESIS((TypeOfArg3)) arg3) { \
return WTF_CONCAT(Class, _##Member##_thunk)(this, arg1, arg2, arg3); \
}
#define _DEFINE_SWIFTCXX_THUNK4(Class, Member, ReturnType, TypeOfArg1, TypeOfArg2, TypeOfArg3, TypeOfArg4) \
ReturnType Class::Member(_WTF_REMOVE_PARENTHESIS((TypeOfArg1)) arg1, _WTF_REMOVE_PARENTHESIS((TypeOfArg2)) arg2, _WTF_REMOVE_PARENTHESIS((TypeOfArg3)) arg3, _WTF_REMOVE_PARENTHESIS((TypeOfArg4)) arg4) { \
return WTF_CONCAT(Class, _##Member##_thunk)(this, arg1, arg2, arg3, arg4); \
}
#define _DEFINE_SWIFTCXX_THUNK5(Class, Member, ReturnType, TypeOfArg1, TypeOfArg2, TypeOfArg3, TypeOfArg4, TypeOfArg5) \
ReturnType Class::Member(_WTF_REMOVE_PARENTHESIS((TypeOfArg1)) arg1, _WTF_REMOVE_PARENTHESIS((TypeOfArg2)) arg2, _WTF_REMOVE_PARENTHESIS((TypeOfArg3)) arg3, _WTF_REMOVE_PARENTHESIS((TypeOfArg4)) arg4, _WTF_REMOVE_PARENTHESIS((TypeOfArg5)) arg5) { \
return WTF_CONCAT(Class, _##Member##_thunk)(this, arg1, arg2, arg3, arg4, arg5); \
}
#define _DEFINE_SWIFTCXX_THUNK6(Class, Member, ReturnType, TypeOfArg1, TypeOfArg2, TypeOfArg3, TypeOfArg4, TypeOfArg5, TypeOfArg6) \
ReturnType Class::Member(_WTF_REMOVE_PARENTHESIS((TypeOfArg1)) arg1, _WTF_REMOVE_PARENTHESIS((TypeOfArg2)) arg2, _WTF_REMOVE_PARENTHESIS((TypeOfArg3)) arg3, _WTF_REMOVE_PARENTHESIS((TypeOfArg4)) arg4, _WTF_REMOVE_PARENTHESIS((TypeOfArg5)) arg5, _WTF_REMOVE_PARENTHESIS((TypeOfArg6)) arg6) { \
return WTF_CONCAT(Class, _##Member##_thunk)(this, arg1, arg2, arg3, arg4, arg5, arg6); \
}
#define _DEFINE_SWIFTCXX_THUNK7(Class, Member, ReturnType, TypeOfArg1, TypeOfArg2, TypeOfArg3, TypeOfArg4, TypeOfArg5, TypeOfArg6, TypeOfArg7) \
ReturnType Class::Member(_WTF_REMOVE_PARENTHESIS(TypeOfArg1) arg1, _WTF_REMOVE_PARENTHESIS((TypeOfArg2)) arg2, _WTF_REMOVE_PARENTHESIS((TypeOfArg3)) arg3, _WTF_REMOVE_PARENTHESIS((TypeOfArg4)) arg4, _WTF_REMOVE_PARENTHESIS((TypeOfArg5)) arg5, _WTF_REMOVE_PARENTHESIS((TypeOfArg6)) arg6, _WTF_REMOVE_PARENTHESIS((TypeOfArg7)) arg7) { \
return WTF_CONCAT(Class, _##Member##_thunk)(this, arg1, arg2, arg3, arg4, arg5, arg6, arg7); \
}
#define _GET_NTH_ARG(_1, _2, _3, _4, _5, _6, _7, NAME, ...) NAME
#define DEFINE_SWIFTCXX_THUNK(Class, Member, ReturnType, ...) \
_GET_NTH_ARG(__VA_ARGS__, _DEFINE_SWIFTCXX_THUNK7, _DEFINE_SWIFTCXX_THUNK6, _DEFINE_SWIFTCXX_THUNK5, _DEFINE_SWIFTCXX_THUNK4, _DEFINE_SWIFTCXX_THUNK3, _DEFINE_SWIFTCXX_THUNK2, _DEFINE_SWIFTCXX_THUNK1, _DEFINE_SWIFTCXX_THUNK0)(Class, Member, ReturnType, ##__VA_ARGS__)
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