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590c25479d
instances of Swift subclasses of ObjC classes. We were already doing this in the runtime. This patch unhides the runtime's mask word (swift_isaMask) and makes IR-gen take advantage of it when it can. Swift SVN r21592
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
//===--- Config.h - Swift Language Platform Configuration ------*- 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 - 2015 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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// Definitions of common interest in Swift.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_RUNTIME_CONFIG_H
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#define SWIFT_RUNTIME_CONFIG_H
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/// Does the current Swift platform support "unbridged" interoperation
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/// with Objective-C? If so, the implementations of various types must
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/// implicitly handle Objective-C pointers.
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///
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/// Apple platforms support this by default.
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#ifndef SWIFT_OBJC_INTEROP
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#ifdef __APPLE__
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#define SWIFT_OBJC_INTEROP 1
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#else
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#define SWIFT_OBJC_INTEROP 0
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#endif
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#endif
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/// Does the current Swift platform allow information other than the
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/// class pointer to be stored in the isa field? If so, when deriving
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/// the class pointer of an object, we must apply a
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/// dynamically-determined mask to the value loaded from the first
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/// field of the object.
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///
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/// According to the Objective-C ABI, this is true only for 64-bit
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/// platforms.
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#ifndef SWIFT_HAS_ISA_MASKING
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#if SWIFT_OBJC_INTEROP && defined(__LP64__)
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#define SWIFT_HAS_ISA_MASKING 1
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#else
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#define SWIFT_HAS_ISA_MASKING 0
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#endif
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#endif
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#endif // SWIFT_RUNTIME_CONFIG_H
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