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664e7cc00e
To make it possible to change the implementation of _stdlib_isOSVersionAtLeast(), remove the @inlinable attribute from it. Since it is currently inlinable and calls the helper function _swift_stdlib_operatingSystemVersion(), we’ll have to keep the helper around as ABI. This change causes a minor pessimization where the LLVM optimizer can no longer reason that, for example, a successful check for 10.12 availability means that a later check for 10.11 will always succeed. I don't expect this pessimization to be a problem, but if needed we could write a custom SIL optimizer pass to claw back the performance. <rdar://problem/59447474>
57 lines
1.8 KiB
Plaintext
57 lines
1.8 KiB
Plaintext
//===--- Availability.mm - Swift Language API Availability Support --------===//
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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 - 2017 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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// Implementation of run-time API availability queries.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Runtime/Config.h"
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#if SWIFT_OBJC_INTEROP
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#include "swift/Basic/Lazy.h"
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#include "swift/Runtime/Debug.h"
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#include <TargetConditionals.h>
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#include "../SwiftShims/FoundationShims.h"
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#include <dlfcn.h>
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struct os_system_version_s {
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unsigned int major;
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unsigned int minor;
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unsigned int patch;
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};
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static os_system_version_s getOSVersion() {
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auto lookup =
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(int(*)(struct os_system_version_s * _Nonnull))
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dlsym(RTLD_DEFAULT, "os_system_version_get_current_version");
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struct os_system_version_s vers = { 0, 0, 0 };
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lookup(&vers);
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return vers;
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}
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using namespace swift;
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/// Return the version of the operating system currently running for use in
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/// API availability queries.
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///
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/// This is ABI and cannot be removed. Even though _stdlib_isOSVersionAtLeast()
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/// is no longer inlinable, is previously was and so calls to this method
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/// have been inlined into shipped apps.
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_SwiftNSOperatingSystemVersion swift::_swift_stdlib_operatingSystemVersion() {
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os_system_version_s version = SWIFT_LAZY_CONSTANT(getOSVersion());
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return { (int)version.major, (int)version.minor, (int)version.patch };
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}
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#endif
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