mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
62 lines
2.7 KiB
C++
62 lines
2.7 KiB
C++
//===--- CompatibiltyOverride.h - Back-deploying compatibility fixes --*- C++ -*-===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See https://swift.org/LICENSE.txt for license information
|
|
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Support back-deploying compatibility fixes for newer apps running on older runtimes.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef COMPATIBILITY_OVERRIDE_H
|
|
#define COMPATIBILITY_OVERRIDE_H
|
|
|
|
#include "Private.h"
|
|
#include "swift/Runtime/Metadata.h"
|
|
#include "swift/Runtime/Once.h"
|
|
#include <type_traits>
|
|
|
|
namespace swift {
|
|
|
|
#define COMPATIBILITY_UNPAREN(...) __VA_ARGS__
|
|
|
|
#define OVERRIDE(name, ret, attrs, ccAttrs, namespace, typedArgs, namedArgs) \
|
|
ccAttrs typedef ret (*Original_ ## name) typedArgs;
|
|
#include "CompatibilityOverride.def"
|
|
|
|
#define OVERRIDE(name, ret, attrs, ccAttrs, namespace, typedArgs, namedArgs) \
|
|
ccAttrs typedef ret (*Override_ ## name)(COMPATIBILITY_UNPAREN typedArgs, \
|
|
Original_ ## name originalImpl);
|
|
#include "CompatibilityOverride.def"
|
|
|
|
#define OVERRIDE(name, ret, attrs, ccAttrs, namespace, typedArgs, namedArgs) \
|
|
Override_ ## name getOverride_ ## name();
|
|
#include "CompatibilityOverride.def"
|
|
|
|
|
|
/// Used to define an override point. The override point #defines the appropriate
|
|
/// OVERRIDE macro from CompatibilityOverride.def to this macro, then includes
|
|
/// the file to generate the override points. The original implementation of the
|
|
/// functionality must be available as swift_funcNameHereImpl.
|
|
#define COMPATIBILITY_OVERRIDE(name, ret, attrs, ccAttrs, namespace, typedArgs, namedArgs) \
|
|
attrs ccAttrs ret namespace swift_ ## name typedArgs { \
|
|
static Override_ ## name Override; \
|
|
static swift_once_t Predicate; \
|
|
swift_once(&Predicate, [](void *) { \
|
|
Override = getOverride_ ## name(); \
|
|
}, nullptr); \
|
|
if (Override != nullptr) \
|
|
return Override(COMPATIBILITY_UNPAREN namedArgs, swift_ ## name ## Impl); \
|
|
return swift_ ## name ## Impl namedArgs; \
|
|
}
|
|
|
|
} /* end namespace swift */
|
|
|
|
#endif /* COMPATIBILITY_OVERRIDE_H */
|