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668f25aee2
The implementation's not quite right (no objc_msgSend_stret on arm64) and since other host OSs aren't being tested right now it's just dead code there. rdar://problem/29982823
79 lines
2.8 KiB
Plaintext
79 lines
2.8 KiB
Plaintext
//===--- AppleHostVersionDetection.mm - Interface to NSProcessInfo --------===//
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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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#include "AppleHostVersionDetection.h"
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#define OBJC_OLD_DISPATCH_PROTOTYPES 0
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#import <Foundation/NSProcessInfo.h>
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#include <objc/message.h>
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#include <objc/runtime.h>
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#include <dlfcn.h>
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using namespace swift;
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#define DLSYM(LIBRARY, SYMBOL) \
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reinterpret_cast<decltype(SYMBOL) *>(dlsym(LIBRARY, #SYMBOL))
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clang::VersionTuple swift::inferAppleHostOSVersion() {
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#if !TARGET_OS_OSX
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// For now, only support this on macOS. It wouldn't take too much work to
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// port it to other Apple platforms, but no one is using that right now.
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return {};
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#else
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// Simulate [[NSProcessInfo processInfo] operatingSystemVersion].
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// DYLD_PRINT_STATISTICS shows that the cost of linking Foundation when we
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// don't need to is a non-trivial percentage of our pre-main startup time.
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// Which, to be fair, is pretty small anyway, but even so.
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// Use RTLD_GLOBAL here, even though we don't need it, because the JIT might
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// end up importing Foundation later, and at that point it /does/ need to be
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// global. (This is arguably a bug in macOS's implementation of dlopen.)
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auto *foundation =
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dlopen("/System/Library/Frameworks/Foundation.framework/Foundation",
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RTLD_LAZY | RTLD_GLOBAL);
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if (!foundation)
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return {};
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auto *cfVersionPtr = DLSYM(foundation, kCFCoreFoundationVersionNumber);
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if (!cfVersionPtr || *cfVersionPtr < kCFCoreFoundationVersionNumber10_10)
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return {};
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auto objcGetClass = DLSYM(foundation, objc_getClass);
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if (!objcGetClass)
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return {};
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Class nsProcessInfo = objcGetClass("NSProcessInfo");
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if (!nsProcessInfo)
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return {};
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auto objcMsgSendProcessInfo =
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reinterpret_cast<NSProcessInfo *(*)(Class, SEL)>(
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DLSYM(foundation, objc_msgSend));
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NSProcessInfo *sharedProcessInfo =
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objcMsgSendProcessInfo(nsProcessInfo, @selector(processInfo));
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if (!sharedProcessInfo)
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return {};
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auto objcMsgSendVersion =
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reinterpret_cast<NSOperatingSystemVersion(*)(NSProcessInfo *, SEL)>(
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DLSYM(foundation, objc_msgSend_stret));
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NSOperatingSystemVersion version =
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objcMsgSendVersion(sharedProcessInfo, @selector(operatingSystemVersion));
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return clang::VersionTuple(static_cast<unsigned>(version.majorVersion),
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static_cast<unsigned>(version.minorVersion),
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static_cast<unsigned>(version.patchVersion));
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#endif
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}
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