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      1 //===--- AlignedAllocation.h - Aligned Allocation ---------------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 ///
     10 /// \file
     11 /// \brief Defines a function that returns the minimum OS versions supporting
     12 /// C++17's aligned allocation functions.
     13 ///
     14 //===----------------------------------------------------------------------===//
     15 
     16 #ifndef LLVM_CLANG_BASIC_ALIGNED_ALLOCATION_H
     17 #define LLVM_CLANG_BASIC_ALIGNED_ALLOCATION_H
     18 
     19 #include "clang/Basic/VersionTuple.h"
     20 #include "llvm/ADT/Triple.h"
     21 #include "llvm/Support/ErrorHandling.h"
     22 
     23 namespace clang {
     24 
     25 inline VersionTuple alignedAllocMinVersion(llvm::Triple::OSType OS) {
     26   switch (OS) {
     27   default:
     28     break;
     29   case llvm::Triple::Darwin:
     30   case llvm::Triple::MacOSX: // Earliest supporting version is 10.13.
     31     return VersionTuple(10U, 13U);
     32   case llvm::Triple::IOS:
     33   case llvm::Triple::TvOS: // Earliest supporting version is 11.0.0.
     34     return VersionTuple(11U);
     35   case llvm::Triple::WatchOS: // Earliest supporting version is 4.0.0.
     36     return VersionTuple(4U);
     37   }
     38 
     39   llvm_unreachable("Unexpected OS");
     40 }
     41 
     42 } // end namespace clang
     43 
     44 #endif // LLVM_CLANG_BASIC_ALIGNED_ALLOCATION_H
     45