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  1. //===--- AlignedAllocation.h - Aligned Allocation ---------------*- 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. /// \file
  10. /// Defines a function that returns the minimum OS versions supporting
  11. /// C++17's aligned allocation functions.
  12. ///
  13. //===----------------------------------------------------------------------===//
  14.  
  15. #ifndef LLVM_CLANG_BASIC_ALIGNEDALLOCATION_H
  16. #define LLVM_CLANG_BASIC_ALIGNEDALLOCATION_H
  17.  
  18. #include "llvm/ADT/Triple.h"
  19. #include "llvm/Support/ErrorHandling.h"
  20. #include "llvm/Support/VersionTuple.h"
  21.  
  22. namespace clang {
  23.  
  24. inline llvm::VersionTuple alignedAllocMinVersion(llvm::Triple::OSType OS) {
  25.   switch (OS) {
  26.   default:
  27.     break;
  28.   case llvm::Triple::Darwin:
  29.   case llvm::Triple::MacOSX: // Earliest supporting version is 10.13.
  30.     return llvm::VersionTuple(10U, 13U);
  31.   case llvm::Triple::IOS:
  32.   case llvm::Triple::TvOS: // Earliest supporting version is 11.0.0.
  33.     return llvm::VersionTuple(11U);
  34.   case llvm::Triple::WatchOS: // Earliest supporting version is 4.0.0.
  35.     return llvm::VersionTuple(4U);
  36.   case llvm::Triple::ZOS:
  37.     return llvm::VersionTuple(); // All z/OS versions have no support.
  38.   }
  39.  
  40.   llvm_unreachable("Unexpected OS");
  41. }
  42.  
  43. } // end namespace clang
  44.  
  45. #endif // LLVM_CLANG_BASIC_ALIGNEDALLOCATION_H
  46.