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45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
//===--- Visibility.h - Visibility macros for runtime exports ---*- C++ -*-===//
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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 - 2016 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 http://swift.org/LICENSE.txt for license information
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// See http://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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// These macros are used to declare symbols that should be exported from the
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// Swift runtime.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_STDLIB_SHIMS_VISIBILITY_H
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#define SWIFT_STDLIB_SHIMS_VISIBILITY_H
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/// Attribute used to export symbols from the runtime.
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#if __MACH__
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# define SWIFT_RUNTIME_EXPORT __attribute__((visibility("default")))
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#elif __ELF__
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// Use protected visibility for ELF, since we don't want Swift symbols to be
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// interposable. The relative relocations we form to metadata aren't
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// valid in ELF shared objects, and leaving them relocatable at load time
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// defeats the purpose of the relative references.
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# define SWIFT_RUNTIME_EXPORT __attribute__((visibility("protected")))
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#elif __CYGWIN__
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# define SWIFT_RUNTIME_EXPORT
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#else
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// __dllexport/__dllimport for Windows?
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# error "Unimplemented object format"
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#endif
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/// Attribute for runtime-stdlib SPI interfaces.
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///
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/// Since the stdlib is currently fully fragile, runtime-stdlib SPI currently
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/// needs to be exported from the core dylib. When the stdlib admits more
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//resilience we may be able to make this hidden.
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#define SWIFT_RUNTIME_STDLIB_INTERFACE SWIFT_RUNTIME_EXPORT
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#endif
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