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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_ALIGNED_ALLOCATION_H
     16 #define LLVM_CLANG_BASIC_ALIGNED_ALLOCATION_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 10.14.
     30     return llvm::VersionTuple(10U, 14U);
     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_ALIGNED_ALLOCATION_H
     46