1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
//===--- CompatibilityOverride.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 "../../public/runtime/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 */
|
