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f7291b21ec
...and explicitly mark symbols we export, either for use by executables or for runtime-stdlib interaction. Until the stdlib supports resilience we have to allow programs to link to these SPI symbols.
93 lines
3.4 KiB
Plaintext
93 lines
3.4 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 - 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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// Implementation of run-time API availability queries.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Runtime/Debug.h"
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#import <Foundation/Foundation.h>
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#include <TargetConditionals.h>
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using namespace swift;
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/// Load the contents of the SystemVersion plist, looking in the appropriate
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/// place if running on the iOS simulator.
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static NSDictionary *systemVersionDictionaryFromPlist() {
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NSString *plistPath = @"/System/Library/CoreServices/SystemVersion.plist";
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#if TARGET_IPHONE_SIMULATOR
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// When targeting the iOS simulator, look in a special location so we do
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// not pick up the host OS version.
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const char *simulatorRoot = getenv("IPHONE_SIMULATOR_ROOT");
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if (!simulatorRoot) {
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fatalError(/* flags = */ 0,
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"Unable to check API availability: "
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"IPHONE_SIMULATOR_ROOT not set when running under simulator");
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}
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plistPath = [NSString stringWithFormat:@"%s%@", simulatorRoot, plistPath];
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#endif
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return [NSDictionary dictionaryWithContentsOfFile:plistPath];
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}
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/// Load and parse the SystemVersion dictionary to determine the current
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/// operating system version.
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static NSOperatingSystemVersion operatingSystemVersionFromPlist() {
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NSDictionary *plistDictionary = systemVersionDictionaryFromPlist();
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if (!plistDictionary) {
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fatalError(/* flags = */ 0,
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"Unable to check API availability: "
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"system version dictionary not found");
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}
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NSString *versionString = [plistDictionary objectForKey:@"ProductVersion"];
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if (!versionString) {
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fatalError(/* flags = */ 0,
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"Unable to check API availability: "
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"ProductVersion not present in system version dictionary");
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}
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// We expect versionString to be of the form x[.y[.z]].
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NSArray *components = [versionString componentsSeparatedByString:@"."];
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NSUInteger cnt = [components count];
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NSOperatingSystemVersion versionStruct;
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versionStruct.majorVersion = [[components objectAtIndex:0] integerValue];
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versionStruct.minorVersion =
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(1 < cnt) ? [[components objectAtIndex:1] integerValue] : 0;
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versionStruct.patchVersion =
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(2 < cnt) ? [[components objectAtIndex:2] integerValue] : 0;
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return versionStruct;
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}
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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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SWIFT_RUNTIME_STDLIB_INTERFACE
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extern "C" NSOperatingSystemVersion _swift_stdlib_operatingSystemVersion() {
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static NSOperatingSystemVersion version = ([]{
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// Use -[NSProcessInfo.operatingSystemVersion] when present
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// (on iOS 8 and OS X 10.10 and above).
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if ([NSProcessInfo
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instancesRespondToSelector:@selector(operatingSystemVersion)]) {
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return [[NSProcessInfo processInfo] operatingSystemVersion];
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} else {
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// Otherwise load and parse from SystemVersion dictionary.
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return operatingSystemVersionFromPlist();
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}
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})();
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return version;
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}
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