Add DriverKit support

[egorzhdan]

Summary

This patch is the first in a series of patches to upstream the support for Apple's DriverKit. Once complete, it will allow targeting DriverKit platform with Clang similarly to AppleClang.

This code was originally authored by JF Bastien.

[egorzhdan]

Fix clang-format warnings in the added code

[arphaman]

Can you add a test case that verifies that using driverkit without a version will default it to driverkit19?

[egorzhdan]

• Add unit-tests to verify that DriverKit version defaults to 19
• Use DriverKit 20 as a minimum available version on arm & add a test for it

[arphaman]

LGTM

llvm/include/llvm/ADT/Triple.h

enum OSType {
     AIX,
     CUDA,       // NVIDIA CUDA
     NVCL,       // NVIDIA OpenCL
     AMDHSA,     // AMD HSA Runtime
     PS4,
     ELFIAMCU,
     TvOS,       // Apple tvOS
     WatchOS,    // Apple watchOS
+    DriverKit,  // Apple DriverKit
     Mesa3D,
     Contiki,
     AMDPAL,     // AMD PAL Runtime
     HermitCore, // HermitCore Unikernel/Multikernel
     Hurd,       // GNU/Hurd
     WASI,       // Experimental WebAssembly OS
     Emscripten,
     LastOSType = Emscripten
public:
   /// Parse the version number as with getOSVersion.  This should only be called
   /// with IOS or generic triples.
   VersionTuple getiOSVersion() const;
 
   /// Parse the version number as with getOSVersion.  This should only be called
   /// with WatchOS or generic triples.
   VersionTuple getWatchOSVersion() const;
 
+  /// Parse the version number as with getOSVersion.
+  VersionTuple getDriverKitVersion() const;
+
   /// @}
   /// @name Direct Component Access
   /// @{
 
   const std::string &str() const { return Data; }
 
   const std::string &getTriple() const { return Data; }
 
public:
   bool isWatchOS() const {
     return getOS() == Triple::WatchOS;
   }
 
   bool isWatchABI() const {
     return getSubArch() == Triple::ARMSubArch_v7k;
   }
 
+  /// Is this an Apple DriverKit triple.
+  bool isDriverKit() const { return getOS() == Triple::DriverKit; }
+
   bool isOSzOS() const { return getOS() == Triple::ZOS; }
 
   /// Is this a "Darwin" OS (macOS, iOS, tvOS or watchOS).
   bool isOSDarwin() const {
-    return isMacOSX() || isiOS() || isWatchOS();
+    return isMacOSX() || isiOS() || isWatchOS() || isDriverKit();
   }
 
   bool isSimulatorEnvironment() const {
     return getEnvironment() == Triple::Simulator;
   }
 
   bool isMacCatalystEnvironment() const {
     return getEnvironment() == Triple::MacABI;

llvm/include/llvm/Support/VersionTuple.h

public:
 
   /// Return a version tuple that contains only the first 3 version components.
   VersionTuple withoutBuild() const {
     if (HasBuild)
       return VersionTuple(Major, Minor, Subminor);
     return *this;
   }
 
+  /// Return a version tuple that contains a different major version but
+  /// everything else is the same.
+  VersionTuple withMajorReplaced(unsigned NewMajor) const {
+    return VersionTuple(NewMajor, Minor, Subminor, Build);
+  }
+
   /// Return a version tuple that contains only components that are non-zero.
   VersionTuple normalize() const {
     VersionTuple Result = *this;
     if (Result.Build == 0) {
       Result.HasBuild = false;
       if (Result.Subminor == 0) {
         Result.HasSubminor = false;
         if (Result.Minor == 0)

llvm/lib/MC/MCParser/DarwinAsmParser.cpp

static Triple::OSType getOSTypeFromPlatform(MachO::PlatformType Type) {
   switch (Type) {
   case MachO::PLATFORM_UNKNOWN: /* silence warning */
     break;
   case MachO::PLATFORM_MACOS:   return Triple::MacOSX;
   case MachO::PLATFORM_IOS:     return Triple::IOS;
   case MachO::PLATFORM_TVOS:    return Triple::TvOS;
   case MachO::PLATFORM_WATCHOS: return Triple::WatchOS;
   case MachO::PLATFORM_BRIDGEOS:         /* silence warning */ break;
+  case MachO::PLATFORM_DRIVERKIT:
+    return Triple::DriverKit;
   case MachO::PLATFORM_MACCATALYST: return Triple::IOS;
   case MachO::PLATFORM_IOSSIMULATOR:     /* silence warning */ break;
   case MachO::PLATFORM_TVOSSIMULATOR:    /* silence warning */ break;
   case MachO::PLATFORM_WATCHOSSIMULATOR: /* silence warning */ break;
-  case MachO::PLATFORM_DRIVERKIT:        /* silence warning */ break;
   }
   llvm_unreachable("Invalid mach-o platform type");
 }
 
 /// parseBuildVersion
 ///   ::= .build_version (macos|ios|tvos|watchos), parseVersion parseSDKVersion
 bool DarwinAsmParser::parseBuildVersion(StringRef Directive, SMLoc Loc) {
   StringRef PlatformName;
   SMLoc PlatformLoc = getTok().getLoc();
   if (getParser().parseIdentifier(PlatformName))
     return TokError("platform name expected");
 
   unsigned Platform = StringSwitch<unsigned>(PlatformName)
     .Case("macos", MachO::PLATFORM_MACOS)
     .Case("ios", MachO::PLATFORM_IOS)
     .Case("tvos", MachO::PLATFORM_TVOS)
     .Case("watchos", MachO::PLATFORM_WATCHOS)
     .Case("macCatalyst", MachO::PLATFORM_MACCATALYST)
+    .Case("driverkit", MachO::PLATFORM_DRIVERKIT)
     .Default(0);
   if (Platform == 0)
     return Error(PlatformLoc, "unknown platform name");
 
   if (getLexer().isNot(AsmToken::Comma))
     return TokError("version number required, comma expected");
   Lex();
 

llvm/lib/MC/MCStreamer.cpp

case Triple::IOS:
     // Mac Catalyst always uses the build version load command.
     if (Target.isMacCatalystEnvironment())
       return VersionTuple();
     LLVM_FALLTHROUGH;
   case Triple::TvOS:
     return VersionTuple(12);
   case Triple::WatchOS:
     return VersionTuple(5);
+  case Triple::DriverKit:
+    // DriverKit always uses the build version load command.
+    return VersionTuple();
   default:
     break;
   }
   llvm_unreachable("unexpected OS type");
 }
 
 static MachO::PlatformType
 getMachoBuildVersionPlatformType(const Triple &Target) {
   assert(Target.isOSDarwin() && "expected a darwin OS");
   switch (Target.getOS()) {
   case Triple::MacOSX:
   case Triple::Darwin:
     return MachO::PLATFORM_MACOS;
   case Triple::IOS:
     if (Target.isMacCatalystEnvironment())
       return MachO::PLATFORM_MACCATALYST;
     return Target.isSimulatorEnvironment() ? MachO::PLATFORM_IOSSIMULATOR
                                            : MachO::PLATFORM_IOS;
   case Triple::TvOS:
     return Target.isSimulatorEnvironment() ? MachO::PLATFORM_TVOSSIMULATOR
                                            : MachO::PLATFORM_TVOS;
   case Triple::WatchOS:
     return Target.isSimulatorEnvironment() ? MachO::PLATFORM_WATCHOSSIMULATOR
                                            : MachO::PLATFORM_WATCHOS;
+  case Triple::DriverKit:
+    return MachO::PLATFORM_DRIVERKIT;
   default:
     break;
   }
   llvm_unreachable("unexpected OS type");
 }
 
 void MCStreamer::emitVersionForTarget(
     const Triple &Target, const VersionTuple &SDKVersion,
case Triple::Darwin:
     break;
   case Triple::IOS:
   case Triple::TvOS:
     Version = Target.getiOSVersion();
     break;
   case Triple::WatchOS:
     Version = Target.getWatchOSVersion();
     break;
+  case Triple::DriverKit:
+    Version = Target.getDriverKitVersion();
+    break;
   default:
     llvm_unreachable("unexpected OS type");
   }
   assert(Version.getMajor() != 0 && "A non-zero major version is expected");
   auto LinkedTargetVersion =
       targetVersionOrMinimumSupportedOSVersion(Target, Version);
   auto BuildVersionOSVersion = getMachoBuildVersionSupportedOS(Target);
   bool ShouldEmitBuildVersion = false;

llvm/lib/Support/Triple.cpp

StringRef Triple::getOSTypeName(OSType Kind) {
   case AMDHSA: return "amdhsa";
   case AMDPAL: return "amdpal";
   case Ananas: return "ananas";
   case CUDA: return "cuda";
   case CloudABI: return "cloudabi";
   case Contiki: return "contiki";
   case Darwin: return "darwin";
   case DragonFly: return "dragonfly";
+  case DriverKit: return "driverkit";
   case ELFIAMCU: return "elfiamcu";
   case Emscripten: return "emscripten";
   case FreeBSD: return "freebsd";
   case Fuchsia: return "fuchsia";
   case Haiku: return "haiku";
   case HermitCore: return "hermit";
   case Hurd: return "hurd";
   case IOS: return "ios";
return StringSwitch<Triple::OSType>(OSName)
     .StartsWith("aix", Triple::AIX)
     .StartsWith("cuda", Triple::CUDA)
     .StartsWith("nvcl", Triple::NVCL)
     .StartsWith("amdhsa", Triple::AMDHSA)
     .StartsWith("ps4", Triple::PS4)
     .StartsWith("elfiamcu", Triple::ELFIAMCU)
     .StartsWith("tvos", Triple::TvOS)
     .StartsWith("watchos", Triple::WatchOS)
+    .StartsWith("driverkit", Triple::DriverKit)
     .StartsWith("mesa3d", Triple::Mesa3D)
     .StartsWith("contiki", Triple::Contiki)
     .StartsWith("amdpal", Triple::AMDPAL)
     .StartsWith("hermit", Triple::HermitCore)
     .StartsWith("hurd", Triple::Hurd)
     .StartsWith("wasi", Triple::WASI)
     .StartsWith("emscripten", Triple::Emscripten)
     .Default(Triple::UnknownOS);
bool Triple::getMacOSXVersion(VersionTuple &Version) const {
   case TvOS:
   case WatchOS:
     // Ignore the version from the triple.  This is only handled because the
     // the clang driver combines OS X and IOS support into a common Darwin
     // toolchain that wants to know the OS X version number even when targeting
     // IOS.
     Version = VersionTuple(10, 4);
     break;
+  case DriverKit:
+    llvm_unreachable("OSX version isn't relevant for DriverKit");
   }
   return true;
 }
 
 VersionTuple Triple::getiOSVersion() const {
   switch (getOS()) {
   default: llvm_unreachable("unexpected OS for Darwin triple");
   case Darwin:
   case MacOSX:
     // Ignore the version from the triple.  This is only handled because the
     // the clang driver combines OS X and IOS support into a common Darwin
     // toolchain that wants to know the iOS version number even when targeting
     // OS X.
     return VersionTuple(5);
   case IOS:
   case TvOS: {
     VersionTuple Version = getOSVersion();
     // Default to 5.0 (or 7.0 for arm64).
     if (Version.getMajor() == 0)
       return (getArch() == aarch64) ? VersionTuple(7) : VersionTuple(5);
     return Version;
   }
   case WatchOS:
     llvm_unreachable("conflicting triple info");
+  case DriverKit:
+    llvm_unreachable("DriverKit doesn't have an iOS version");
   }
 }
 
 VersionTuple Triple::getWatchOSVersion() const {
   switch (getOS()) {
   default: llvm_unreachable("unexpected OS for Darwin triple");
   case Darwin:
   case MacOSX:
     // Ignore the version from the triple.  This is only handled because the
     // the clang driver combines OS X and IOS support into a common Darwin
     // toolchain that wants to know the iOS version number even when targeting
     // OS X.
     return VersionTuple(2);
   case WatchOS: {
     VersionTuple Version = getOSVersion();
     if (Version.getMajor() == 0)
       return VersionTuple(2);
     return Version;
   }
   case IOS:
     llvm_unreachable("conflicting triple info");
+  case DriverKit:
+    llvm_unreachable("DriverKit doesn't have a WatchOS version");
+  }
+}
+
+VersionTuple Triple::getDriverKitVersion() const {
+  switch (getOS()) {
+  default:
+    llvm_unreachable("unexpected OS for Darwin triple");
+  case DriverKit:
+    VersionTuple Version = getOSVersion();
+    if (Version.getMajor() == 0)
+      return Version.withMajorReplaced(19);
+    return Version;
   }
 }
 
 void Triple::setTriple(const Twine &Str) {
   *this = Triple(Str);
 }
 
 void Triple::setArch(ArchType Kind, SubArchType SubArch) {
case Triple::TvOS:
     if (isSimulatorEnvironment())
       return VersionTuple(14, 0, 0);
     break;
   case Triple::WatchOS:
     // ARM64 simulators are supported for watchOS 7+.
     if (isSimulatorEnvironment())
       return VersionTuple(7, 0, 0);
     break;
+  case Triple::DriverKit:
+    return VersionTuple(20, 0, 0);
   default:
     break;
   }
   return VersionTuple();
 }
 
 StringRef Triple::getARMCPUForArch(StringRef MArch) const {
   if (MArch.empty())
case llvm::Triple::Win32:
     // FIXME: this is invalid for WindowsCE
     if (ARM::parseArchVersion(MArch) <= 7)
       return "cortex-a9";
     break;
   case llvm::Triple::IOS:
   case llvm::Triple::MacOSX:
   case llvm::Triple::TvOS:
   case llvm::Triple::WatchOS:
+  case llvm::Triple::DriverKit:
     if (MArch == "v7k")
       return "cortex-a7";
     break;
   default:
     break;
   }
 
   if (MArch.empty())

llvm/lib/Target/AArch64/AArch64Subtarget.cpp

 bool AArch64Subtarget::enableEarlyIfConversion() const {
   return EnableEarlyIfConvert;
 }
 
 bool AArch64Subtarget::supportsAddressTopByteIgnored() const {
   if (!UseAddressTopByteIgnored)
     return false;
 
+  if (TargetTriple.isDriverKit())
+    return true;
   if (TargetTriple.isiOS()) {
     return TargetTriple.getiOSVersion() >= VersionTuple(8);
   }
 
   return false;
 }
 
 std::unique_ptr<PBQPRAConstraint>

llvm/lib/Target/ARM/ARMISelLowering.cpp

ARMTargetLowering::ARMTargetLowering(const TargetMachine &TM,
     : TargetLowering(TM), Subtarget(&STI) {
   RegInfo = Subtarget->getRegisterInfo();
   Itins = Subtarget->getInstrItineraryData();
 
   setBooleanContents(ZeroOrOneBooleanContent);
   setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
 
   if (!Subtarget->isTargetDarwin() && !Subtarget->isTargetIOS() &&
-      !Subtarget->isTargetWatchOS()) {
+      !Subtarget->isTargetWatchOS() && !Subtarget->isTargetDriverKit()) {
     bool IsHFTarget = TM.Options.FloatABIType == FloatABI::Hard;
     for (int LCID = 0; LCID < RTLIB::UNKNOWN_LIBCALL; ++LCID)
       setLibcallCallingConv(static_cast<RTLIB::Libcall>(LCID),
                             IsHFTarget ? CallingConv::ARM_AAPCS_VFP
                                        : CallingConv::ARM_AAPCS);
   }
 
   if (Subtarget->isTargetMachO()) {

llvm/lib/Target/ARM/ARMSubtarget.h

public:
   bool hasMatMulInt8() const { return HasMatMulInt8; }
 
   const Triple &getTargetTriple() const { return TargetTriple; }
 
   bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
   bool isTargetIOS() const { return TargetTriple.isiOS(); }
   bool isTargetWatchOS() const { return TargetTriple.isWatchOS(); }
   bool isTargetWatchABI() const { return TargetTriple.isWatchABI(); }
+  bool isTargetDriverKit() const { return TargetTriple.isDriverKit(); }
   bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
   bool isTargetNaCl() const { return TargetTriple.isOSNaCl(); }
   bool isTargetNetBSD() const { return TargetTriple.isOSNetBSD(); }
   bool isTargetWindows() const { return TargetTriple.isOSWindows(); }
 
   bool isTargetCOFF() const { return TargetTriple.isOSBinFormatCOFF(); }
   bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
   bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }

llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp

struct ShadowMapping {
   bool InGlobal;
 };
 
 } // end anonymous namespace
 
 static ShadowMapping getShadowMapping(const Triple &TargetTriple, int LongSize,
                                       bool IsKasan) {
   bool IsAndroid = TargetTriple.isAndroid();
-  bool IsIOS = TargetTriple.isiOS() || TargetTriple.isWatchOS();
+  bool IsIOS = TargetTriple.isiOS() || TargetTriple.isWatchOS() ||
+               TargetTriple.isDriverKit();
   bool IsMacOS = TargetTriple.isMacOSX();
   bool IsFreeBSD = TargetTriple.isOSFreeBSD();
   bool IsNetBSD = TargetTriple.isOSNetBSD();
   bool IsPS4CPU = TargetTriple.isPS4CPU();
   bool IsLinux = TargetTriple.isOSLinux();
   bool IsPPC64 = TargetTriple.getArch() == Triple::ppc64 ||
                  TargetTriple.getArch() == Triple::ppc64le;
   bool IsSystemZ = TargetTriple.getArch() == Triple::systemz;
if (!TargetTriple.isOSBinFormatMachO())
     return false;
 
   if (TargetTriple.isMacOSX() && !TargetTriple.isMacOSXVersionLT(10, 11))
     return true;
   if (TargetTriple.isiOS() /* or tvOS */ && !TargetTriple.isOSVersionLT(9))
     return true;
   if (TargetTriple.isWatchOS() && !TargetTriple.isOSVersionLT(2))
     return true;
+  if (TargetTriple.isDriverKit())
+    return true;
 
   return false;
 }
 
 StringRef ModuleAddressSanitizer::getGlobalMetadataSection() const {
   switch (TargetTriple.getObjectFormat()) {
   case Triple::COFF:  return ".ASAN$GL";
   case Triple::ELF:   return "asan_globals";

llvm/test/MC/MachO/AArch64/arm-darwin-version-min-load-command.s

 // RUN: llvm-mc -triple arm64-apple-ios10-simulator %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-BUILD-IOSSIM2
 // RUN: llvm-mc -triple arm64e-apple-ios10-simulator %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-BUILD-IOSSIM2
 // RUN: llvm-mc -triple arm64-apple-ios13-simulator %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-BUILD-IOSSIM2
 // RUN: llvm-mc -triple arm64-apple-ios14-simulator %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-BUILD-IOSSIM2
 // RUN: llvm-mc -triple arm64-apple-ios14.1-simulator %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-BUILD-IOSSIM3
 // RUN: llvm-mc -triple arm64-apple-tvos10-simulator %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-BUILD-TVOSSIM2
 // RUN: llvm-mc -triple arm64-apple-watchos3-simulator %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-BUILD-WATCHOSSIM2
 
+// RUN: llvm-mc -triple arm64-apple-driverkit19.0 %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-DRIVERKIT-ARM64
+// RUN: llvm-mc -triple arm64e-apple-driverkit19.0 %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-DRIVERKIT-ARM64
+// RUN: llvm-mc -triple arm64-apple-driverkit20.1 %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-DRIVERKIT-ARM64_1
+
 // CHECK-BUILD-IOS-ARM64E:           cmd LC_BUILD_VERSION
 // CHECK-BUILD-IOS-ARM64E-NEXT:  cmdsize 24
 // CHECK-BUILD-IOS-ARM64E-NEXT: platform ios
 // CHECK-BUILD-IOS-ARM64E-NEXT:      sdk n/a
 // CHECK-BUILD-IOS-ARM64E-NEXT:    minos 14.0
 // CHECK-BUILD-IOS-ARM64E-NEXT:   ntools 0
 // CHECK-BUILD-IOS-ARM64E-NOT: LC_VERSION_MIN
 

 // CHECK-MACCATALYST-ARM64-NEXT:   ntools 0
 
 // CHECK-MACCATALYST-ARM64_1:           cmd LC_BUILD_VERSION
 // CHECK-MACCATALYST-ARM64_1-NEXT:  cmdsize 24
 // CHECK-MACCATALYST-ARM64_1-NEXT: platform macCatalyst
 // CHECK-MACCATALYST-ARM64_1-NEXT:      sdk n/a
 // CHECK-MACCATALYST-ARM64_1-NEXT:    minos 14.1
 // CHECK-MACCATALYST-ARM64_1-NEXT:   ntools 0
+
+// CHECK-DRIVERKIT-ARM64:            cmd LC_BUILD_VERSION
+// CHECK-DRIVERKIT-ARM64-NEXT:   cmdsize 24
+// CHECK-DRIVERKIT-ARM64-NEXT:  platform driverkit
+// CHECK-DRIVERKIT-ARM64-NEXT:       sdk n/a
+// CHECK-DRIVERKIT-ARM64-NEXT:     minos 20.0
+// CHECK-DRIVERKIT-ARM64-NEXT:    ntools 0
+
+// CHECK-DRIVERKIT-ARM64_1:            cmd LC_BUILD_VERSION
+// CHECK-DRIVERKIT-ARM64_1-NEXT:   cmdsize 24
+// CHECK-DRIVERKIT-ARM64_1-NEXT:  platform driverkit
+// CHECK-DRIVERKIT-ARM64_1-NEXT:       sdk n/a
+// CHECK-DRIVERKIT-ARM64_1-NEXT:     minos 20.1
+// CHECK-DRIVERKIT-ARM64_1-NEXT:    ntools 0

llvm/test/MC/MachO/darwin-version-min-load-command.s

 // CHECK-IOS:   cmdsize 16
 // CHECK-IOS:   version 8.0
 
 // CHECK-DARWIN-NOT: LC_VERSION_MIN
 
 
 // RUN: llvm-mc -triple x86_64-apple-watchos1.0.0 %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-WATCHOS
 // RUN: llvm-mc -triple x86_64-apple-tvos8.0.0 %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-TVOS
+// RUN: llvm-mc -triple x86_64-apple-driverkit19.0 %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s --check-prefix=CHECK-DRIVERKIT
 // CHECK-WATCHOS: Load command
 // CHECK-WATCHOS:           cmd LC_VERSION_MIN_WATCHOS
 // CHECK-WATCHOS-NEXT:   cmdsize 16
 // CHECK-WATCHOS-NEXT:   version 1.0
 
 // CHECK-TVOS:            cmd LC_VERSION_MIN_TVOS
 // CHECK-TVOS-NEXT:   cmdsize 16
 // CHECK-TVOS-NEXT:   version 8.0
 
 // CHECK-BRIDGEOS:            cmd LC_BUILD_VERSION
 // CHECK-BRIDGEOS-NEXT:   cmdsize 24
 // CHECK-BRIDGEOS-NEXT:  platform bridgeos
 // CHECK-BRIDGEOS-NEXT:       sdk n/a
 // CHECK-BRIDGEOS-NEXT:     minos 2.0
 // CHECK-BRIDGEOS-NEXT:    ntools 0
 
 // CHECK-MACCATALYST:           cmd LC_BUILD_VERSION
 // CHECK-MACCATALYST-NEXT:  cmdsize 24
 // CHECK-MACCATALYST-NEXT: platform macCatalyst
 // CHECK-MACCATALYST-NEXT:      sdk n/a
 // CHECK-MACCATALYST-NEXT:    minos 13.0
 // CHECK-MACCATALYST-NEXT:   ntools 0
 
+// CHECK-DRIVERKIT:            cmd LC_BUILD_VERSION
+// CHECK-DRIVERKIT-NEXT:   cmdsize 24
+// CHECK-DRIVERKIT-NEXT:  platform driverkit
+// CHECK-DRIVERKIT-NEXT:       sdk n/a
+// CHECK-DRIVERKIT-NEXT:     minos 19.0
+// CHECK-DRIVERKIT-NEXT:    ntools 0
+
 // CHECK-BUILD-MACOS:           cmd LC_BUILD_VERSION
 // CHECK-BUILD-MACOS-NEXT:  cmdsize 24
 // CHECK-BUILD-MACOS-NEXT: platform macos
 // CHECK-BUILD-MACOS-NEXT:      sdk n/a
 // CHECK-BUILD-MACOS-NEXT:    minos 10.14
 // CHECK-BUILD-MACOS-NEXT:   ntools 0
 // CHECK-BUILD-MACOS-NOT: LC_VERSION_MIN
 

llvm/test/MC/MachO/driverkit-sdk-version.ll

+; RUN: llc %s -filetype=obj -o - | llvm-objdump --macho --private-headers - | FileCheck %s
+; RUN: llc %s -filetype=asm -o - | FileCheck --check-prefix=ASM %s
+
+target triple = "x86_64-apple-driverkit19.0.0"
+
+define void @foo() {
+entry:
+  ret void
+}
+
+; CHECK:            cmd LC_BUILD_VERSION
+; CHECK-NEXT:   cmdsize 24
+; CHECK-NEXT:  platform driverkit
+; CHECK-NEXT:       sdk n/a
+; CHECK-NEXT:     minos 19.0
+; CHECK-NEXT:    ntools 0
+
+; ASM: .build_version driverkit, 19, 0

llvm/unittests/ADT/TripleTest.cpp

TEST(TripleTest, getOSVersion) {
 
   T = Triple("x86_64-apple-ios13.0-macabi");
   EXPECT_TRUE(T.isiOS());
   Version = T.getiOSVersion();
   EXPECT_EQ(VersionTuple(13, 0), Version);
   EXPECT_TRUE(T.getEnvironment() == Triple::MacABI);
   EXPECT_TRUE(T.isMacCatalystEnvironment());
   EXPECT_FALSE(T.isSimulatorEnvironment());
+
+  T = Triple("x86_64-apple-driverkit20.1.0");
+  EXPECT_TRUE(T.isDriverKit());
+  EXPECT_TRUE(T.isOSDarwin());
+  EXPECT_FALSE(T.isMacOSX());
+  EXPECT_FALSE(T.isiOS());
+  Version = T.getDriverKitVersion();
+  EXPECT_EQ(VersionTuple(20, 1), Version);
+
+  T = Triple("x86_64-apple-driverkit20");
+  Version = T.getDriverKitVersion();
+  EXPECT_EQ(VersionTuple(20, 0), Version);
+
+  // DriverKit version should default to 19.0.
+  T = Triple("x86_64-apple-driverkit");
+  Version = T.getDriverKitVersion();
+  EXPECT_EQ(VersionTuple(19, 0), Version);
 }
 
 TEST(TripleTest, getEnvironmentVersion) {
   Triple T;
   VersionTuple Version;
 
   T = Triple("arm-unknown-linux-android16");
   EXPECT_TRUE(T.isAndroid());