[llvm] Introduce XROS platform (#77707)

Accepts but otherwise ignores visionOS/XROS target triples as Darwin
based platform.

https://developer.apple.com/documentation/visionos

Author: cyndyishida

llvm/include/llvm/BinaryFormat/MachO.def

@@ -133,6 +133,8 @@ PLATFORM(IOSSIMULATOR, 7, iossimulator, iossimulator, ios-simulator, ios-simulat
 PLATFORM(TVOSSIMULATOR, 8, tvossimulator, tvossimulator, tvos-simulator, tvos-simulator, tvOS Simulator)
 PLATFORM(WATCHOSSIMULATOR, 9, watchossimulator, watchossimulator, watchos-simulator, watchos-simulator, watchOS Simulator)
 PLATFORM(DRIVERKIT, 10, driverkit, driverkit, driverkit, driverkit, DriverKit)
+PLATFORM(XROS, 11, xros, xros, xros, xros, xrOS)
+PLATFORM(XROS_SIMULATOR, 12, xrsimulator, xrsimulator, xrsimulator, xros-simulator, xrOS Simulator)
 #endif
 
 #undef HANDLE_LOAD_COMMAND

llvm/include/llvm/TargetParser/Triple.h

@@ -214,6 +214,7 @@ class Triple {
     TvOS,       // Apple tvOS
     WatchOS,    // Apple watchOS
     DriverKit,  // Apple DriverKit
+    XROS,       // Apple XROS
     Mesa3D,
     AMDPAL,     // AMD PAL Runtime
     HermitCore, // HermitCore Unikernel/Multikernel
@@ -514,14 +515,17 @@ class Triple {
     return getSubArch() == Triple::ARMSubArch_v7k;
   }
 
+  /// Is this an Apple XROS triple.
+  bool isXROS() const { return getOS() == Triple::XROS; }
+
   /// 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, watchOS, or DriverKit).
+  /// Is this a "Darwin" OS (macOS, iOS, tvOS, watchOS, XROS, or DriverKit).
   bool isOSDarwin() const {
-    return isMacOSX() || isiOS() || isWatchOS() || isDriverKit();
+    return isMacOSX() || isiOS() || isWatchOS() || isDriverKit() || isXROS();
   }
 
   bool isSimulatorEnvironment() const {

llvm/lib/TargetParser/Triple.cpp

@@ -273,6 +273,7 @@ StringRef Triple::getOSTypeName(OSType Kind) {
   case ZOS: return "zos";
   case ShaderModel: return "shadermodel";
   case LiteOS: return "liteos";
+  case XROS: return "xros";
   }
 
   llvm_unreachable("Invalid OSType");
@@ -634,6 +635,8 @@ static Triple::OSType parseOS(StringRef OSName) {
     .StartsWith("tvos", Triple::TvOS)
     .StartsWith("watchos", Triple::WatchOS)
     .StartsWith("driverkit", Triple::DriverKit)
+    .StartsWith("xros", Triple::XROS)
+    .StartsWith("visionos", Triple::XROS)
     .StartsWith("mesa3d", Triple::Mesa3D)
     .StartsWith("amdpal", Triple::AMDPAL)
     .StartsWith("hermit", Triple::HermitCore)
@@ -1224,6 +1227,8 @@ VersionTuple Triple::getOSVersion() const {
     OSName = OSName.substr(OSTypeName.size());
   else if (getOS() == MacOSX)
     OSName.consume_front("macos");
+  else if (OSName.starts_with("visionos"))
+    OSName.consume_front("visionos");
 
   return parseVersionFromName(OSName);
 }
@@ -1265,6 +1270,8 @@ bool Triple::getMacOSXVersion(VersionTuple &Version) const {
     // IOS.
     Version = VersionTuple(10, 4);
     break;
+  case XROS:
+    llvm_unreachable("OSX version isn't relevant for xrOS");
   case DriverKit:
     llvm_unreachable("OSX version isn't relevant for DriverKit");
   }
@@ -1289,6 +1296,11 @@ VersionTuple Triple::getiOSVersion() const {
       return (getArch() == aarch64) ? VersionTuple(7) : VersionTuple(5);
     return Version;
   }
+  case XROS: {
+    // xrOS 1 is aligned with iOS 17.
+    VersionTuple Version = getOSVersion();
+    return Version.withMajorReplaced(Version.getMajor() + 16);
+  }
   case WatchOS:
     llvm_unreachable("conflicting triple info");
   case DriverKit:
@@ -1314,6 +1326,8 @@ VersionTuple Triple::getWatchOSVersion() const {
   }
   case IOS:
     llvm_unreachable("conflicting triple info");
+  case XROS:
+    llvm_unreachable("watchOS version isn't relevant for xrOS");
   case DriverKit:
     llvm_unreachable("DriverKit doesn't have a WatchOS version");
   }

llvm/lib/TextAPI/Platform.cpp

@@ -106,6 +106,10 @@ std::string getOSAndEnvironmentName(PlatformType Platform,
     return "watchos" + Version + "-simulator";
   case PLATFORM_DRIVERKIT:
     return "driverkit" + Version;
+  case PLATFORM_XROS:
+    return "xros" + Version;
+  case PLATFORM_XROS_SIMULATOR:
+    return "xros" + Version + "-simulator";
   }
   llvm_unreachable("Unknown llvm::MachO::PlatformType enum");
 }

llvm/unittests/TargetParser/TripleTest.cpp

@@ -1746,6 +1746,42 @@ TEST(TripleTest, EndianArchVariants) {
   EXPECT_EQ(Triple::dxil, T.getLittleEndianArchVariant().getArch());
 }
 
+TEST(TripleTest, XROS) {
+  Triple T;
+  VersionTuple Version;
+
+  T = Triple("arm64-apple-xros");
+  EXPECT_TRUE(T.isXROS());
+  EXPECT_TRUE(T.isOSDarwin());
+  EXPECT_FALSE(T.isiOS());
+  EXPECT_FALSE(T.isMacOSX());
+  EXPECT_FALSE(T.isSimulatorEnvironment());
+  EXPECT_EQ(T.getOSName(), "xros");
+  Version = T.getOSVersion();
+  EXPECT_EQ(VersionTuple(0), Version);
+
+  T = Triple("arm64-apple-visionos1.2");
+  EXPECT_TRUE(T.isXROS());
+  EXPECT_TRUE(T.isOSDarwin());
+  EXPECT_FALSE(T.isiOS());
+  EXPECT_FALSE(T.isMacOSX());
+  EXPECT_FALSE(T.isSimulatorEnvironment());
+  EXPECT_EQ(T.getOSName(), "visionos1.2");
+  Version = T.getOSVersion();
+  EXPECT_EQ(VersionTuple(1, 2), Version);
+
+  T = Triple("arm64-apple-xros1-simulator");
+  EXPECT_TRUE(T.isXROS());
+  EXPECT_TRUE(T.isOSDarwin());
+  EXPECT_FALSE(T.isiOS());
+  EXPECT_FALSE(T.isMacOSX());
+  EXPECT_TRUE(T.isSimulatorEnvironment());
+  Version = T.getOSVersion();
+  EXPECT_EQ(VersionTuple(1), Version);
+  Version = T.getiOSVersion();
+  EXPECT_EQ(VersionTuple(17), Version);
+}
+
 TEST(TripleTest, getOSVersion) {
   Triple T;
   VersionTuple Version;