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The toolchain has traditionally been buildable with clang, cl (MSVC), and gcc. `__has_feature` is a clang-specific directive, ensure that we are portable to other compilers by providing a definition of the macro incase it is not available (which also includes older clang releases).
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
//===--- BridgedSwiftObject.h - C header which defines SwiftObject --------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This is a C header, which defines the SwiftObject header. For the C++ version
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// see SwiftObjectHeader.h.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SIL_BRIDGEDSWIFTOBJECT_H
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#define SWIFT_SIL_BRIDGEDSWIFTOBJECT_H
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#include <stdint.h>
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#if !defined(__has_feature)
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#define __has_feature(feature) 0
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#endif
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// TODO: These macro definitions are duplicated in Visibility.h. Move
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// them to a single file if we find a location that both Visibility.h and
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// BridgedSwiftObject.h can import.
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#if __has_feature(nullability)
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// Provide macros to temporarily suppress warning about the use of
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// _Nullable and _Nonnull.
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# define SWIFT_BEGIN_NULLABILITY_ANNOTATIONS \
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_Pragma("clang diagnostic push") \
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_Pragma("clang diagnostic ignored \"-Wnullability-extension\"")
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# define SWIFT_END_NULLABILITY_ANNOTATIONS \
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_Pragma("clang diagnostic pop")
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#else
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// #define _Nullable and _Nonnull to nothing if we're not being built
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// with a compiler that supports them.
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# define _Nullable
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# define _Nonnull
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# define _Null_unspecified
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# define SWIFT_BEGIN_NULLABILITY_ANNOTATIONS
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# define SWIFT_END_NULLABILITY_ANNOTATIONS
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#endif
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SWIFT_BEGIN_NULLABILITY_ANNOTATIONS
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typedef const void * _Nonnull SwiftMetatype;
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/// The header of a Swift object.
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///
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/// This must be in sync with HeapObject, which is defined in the runtime lib.
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/// It must be layout compatible with the Swift object header.
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struct BridgedSwiftObject {
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SwiftMetatype metatype;
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int64_t refCounts;
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};
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typedef struct BridgedSwiftObject * _Nonnull SwiftObject;
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typedef struct BridgedSwiftObject * _Nullable OptionalSwiftObject;
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SWIFT_END_NULLABILITY_ANNOTATIONS
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#endif
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