1 //===--- Availability.h - Classes for availability --------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This files defines some classes that implement availability checking.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_CLANG_AST_AVAILABILITY_H
14 #define LLVM_CLANG_AST_AVAILABILITY_H
15 
16 #include "clang/Basic/SourceLocation.h"
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/Support/VersionTuple.h"
19 
20 namespace clang {
21 
22 /// One specifier in an @available expression.
23 ///
24 /// \code
25 ///   @available(macos 10.10, *)
26 /// \endcode
27 ///
28 /// Here, 'macos 10.10' and '*' both map to an instance of this type.
29 ///
30 class AvailabilitySpec {
31   /// Represents the version that this specifier requires. If the host OS
32   /// version is greater than or equal to Version, the @available will evaluate
33   /// to true.
34   VersionTuple Version;
35 
36   /// Name of the platform that Version corresponds to.
37   StringRef Platform;
38 
39   SourceLocation BeginLoc, EndLoc;
40 
41 public:
42   AvailabilitySpec(VersionTuple Version, StringRef Platform,
43                    SourceLocation BeginLoc, SourceLocation EndLoc)
44       : Version(Version), Platform(Platform), BeginLoc(BeginLoc),
45         EndLoc(EndLoc) {}
46 
47   /// This constructor is used when representing the '*' case.
48   AvailabilitySpec(SourceLocation StarLoc)
49       : BeginLoc(StarLoc), EndLoc(StarLoc) {}
50 
51   VersionTuple getVersion() const { return Version; }
52   StringRef getPlatform() const { return Platform; }
53   SourceLocation getBeginLoc() const { return BeginLoc; }
54   SourceLocation getEndLoc() const { return EndLoc; }
55 
56   /// Returns true when this represents the '*' case.
57   bool isOtherPlatformSpec() const { return Version.empty(); }
58 };
59 
60 } // end namespace clang
61 
62 #endif
63