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fbe990481b
Recent Swift uses 2 as the is-Swift bit when running on newer versions, and 1 on older versions. Since it's difficult or impossible to know what we'll be running on at build time, make the selection at runtime.
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
//===--- BackDeployment.cpp - Support for running on older OS versions. ---===//
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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 - 2019 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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#include "swift/Runtime/BackDeployment.h"
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#include "swift/Runtime/Config.h"
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#include "../SwiftShims/FoundationShims.h"
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#include <stdlib.h>
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#if defined(__APPLE__) && defined(__MACH__)
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#if SWIFT_CLASS_IS_SWIFT_MASK_GLOBAL_VARIABLE
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static unsigned long long computeIsSwiftMask() {
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if (swift::_swift_isBackDeploying())
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return 1ULL;
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return 2ULL;
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}
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SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_BEGIN
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extern "C" unsigned long long
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_swift_classIsSwiftMask = computeIsSwiftMask();
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SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_END
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#endif // SWIFT_CLASS_IS_SWIFT_MASK_GLOBAL_VARIABLE
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static swift::_SwiftNSOperatingSystemVersion swiftInOSVersion = {
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#if __MAC_OS_X_VERSION_MIN_REQUIRED
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10, 14, 4
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// WatchOS also pretends to be iOS, so check it first.
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#elif __WATCH_OS_VERSION_MIN_REQUIRED
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5, 2, 0
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#elif __IPHONE_OS_VERSION_MIN_REQUIRED || __TV_OS_VERSION_MIN_REQUIRED
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12, 2, 0
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#else
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9999, 0, 0
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#endif
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};
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static bool versionLessThan(swift::_SwiftNSOperatingSystemVersion lhs,
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swift::_SwiftNSOperatingSystemVersion rhs) {
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if (lhs.majorVersion < rhs.majorVersion) return true;
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if (lhs.majorVersion > rhs.majorVersion) return false;
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if (lhs.minorVersion < rhs.minorVersion) return true;
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if (lhs.minorVersion > rhs.minorVersion) return false;
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if (lhs.patchVersion < rhs.patchVersion) return true;
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return false;
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}
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SWIFT_RUNTIME_STDLIB_INTERNAL
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int _swift_isBackDeploying() {
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auto version = swift::_swift_stdlib_operatingSystemVersion();
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return versionLessThan(version, swiftInOSVersion);
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}
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#endif
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