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[interop] update <swift/bridging> to have language comment and __has_attribute guard #65589

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Merged
merged 2 commits into from
May 3, 2023
Merged

[interop] update <swift/bridging> to have language comment and __has_attribute guard #65589

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b55bc19
[interop] <swift/bridging> header should have a language comment line…
hyp May 2, 2023
2fcad59
[interop] <swift/bridging> guard macros using has_attribute to make t…
hyp May 2, 2023
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25 changes: 25 additions & 0 deletions lib/ClangImporter/bridging
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
// -*- C++ -*-
//===------------------ bridging - C++ and Swift Interop --------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
Expand All @@ -17,6 +18,14 @@
#ifndef SWIFT_CLANGIMPORTER_SWIFT_INTEROP_SUPPORT_H
#define SWIFT_CLANGIMPORTER_SWIFT_INTEROP_SUPPORT_H

#ifdef __has_attribute
#define _CXX_INTEROP_HAS_ATTRIBUTE(x) __has_attribute(x)
#else
#define _CXX_INTEROP_HAS_ATTRIBUTE(x) 0
#endif

#if _CXX_INTEROP_HAS_ATTRIBUTE(swift_attr)

/// Specifies that a C++ `class` or `struct` owns and controls the lifetime of all
/// of the objects it references. Such type should not reference any objects whose
/// lifetime is controlled externally. This annotation allows Swift to import methods
Expand Down Expand Up @@ -124,4 +133,20 @@
#define SWIFT_COMPUTED_PROPERTY \
__attribute__((swift_attr("import_computed_property")))

#else // #if _CXX_INTEROP_HAS_ATTRIBUTE(swift_attr)

// Empty defines for compilers that don't support `attribute(swift_attr)`.
#define SWIFT_SELF_CONTAINED
#define SWIFT_RETURNS_INDEPENDENT_VALUE
#define SWIFT_SHARED_REFERENCE(_retain, _release)
#define SWIFT_IMMORTAL_REFERENCE
#define SWIFT_UNSAFE_REFERENCE
#define SWIFT_NAME(_name)
#define SWIFT_CONFORMS_TO_PROTOCOL(_moduleName_protocolName)
#define SWIFT_COMPUTED_PROPERTY

#endif // #if _CXX_INTEROP_HAS_ATTRIBUTE(swift_attr)

#undef _CXX_INTEROP_HAS_ATTRIBUTE

#endif // SWIFT_CLANGIMPORTER_SWIFT_INTEROP_SUPPORT_H