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9c7d27c4eb
This patch adds a compiler entry point to the standard library that checks whether the running OS version is greater than or equal to a given version triple. The idea is that #os(...) will get SILGen'd into a call to this function. The standard library function calls a runtime function to actually get the OS version. This runtime function uses -[NSProcessInfo operatingSystemVersion] when possible, otherwise it loads the SystemVersion plist. When running under the simulator, we use an environmental variable set by the simulator to look up the version for the simulated OS and not the host OS. At the moment, there is no caching for version info. I will add this in a later patch. Swift SVN r22303
87 lines
3.2 KiB
Plaintext
87 lines
3.2 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 - 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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// Implementation of run-time API availability queries.
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//
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//===----------------------------------------------------------------------===//
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#include "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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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("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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NSOperatingSystemVersion operatingSystemVersionFromPlist() {
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NSDictionary *plistDictionary = systemVersionDictionaryFromPlist();
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if (!plistDictionary) {
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fatalError("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("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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extern "C" NSOperatingSystemVersion _swift_stdlib_operatingSystemVersion() {
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// For the moment, we do not cache the version value.
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// FIXME: Cache the version value in a thread-safe manner.
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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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}
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return operatingSystemVersionFromPlist();
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}
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