Revert "[Driver][SYCL] Add initial SYCL offload compilation support" (#116381)

Reverts #107493

Failing bots include:
https://lab.llvm.org/buildbot/#/builders/190/builds/9546
https://lab.llvm.org/buildbot/#/builders/46/builds/7938

Author: AaronBallman

clang/include/clang/Driver/Action.h

@@ -94,7 +94,6 @@ class Action {
     OFK_Cuda = 0x02,
     OFK_OpenMP = 0x04,
     OFK_HIP = 0x08,
-    OFK_SYCL = 0x10,
   };
 
   static const char *getClassName(ActionClass AC);

clang/include/clang/Driver/Driver.h

@@ -582,10 +582,6 @@ class Driver {
   /// @name Helper Methods
   /// @{
 
-  /// getSYCLDeviceTriple - Returns the SYCL device triple for the
-  /// specified ArchType.
-  llvm::Triple getSYCLDeviceTriple(StringRef TargetArch = "spir64") const;
-
   /// PrintActions - Print the list of actions.
   void PrintActions(const Compilation &C) const;
 

clang/include/clang/Driver/Options.td

@@ -182,8 +182,7 @@ def opencl_Group : OptionGroup<"<opencl group>">, Group<f_Group>,
                    DocName<"OpenCL options">;
 
 def sycl_Group : OptionGroup<"<SYCL group>">, Group<f_Group>,
-                 DocName<"SYCL options">,
-                 Visibility<[ClangOption, CLOption]>;
+                 DocName<"SYCL options">;
 
 def cuda_Group : OptionGroup<"<CUDA group>">, Group<f_Group>,
                    DocName<"CUDA options">,
@@ -6781,20 +6780,16 @@ defm : FlangIgnoredDiagOpt<"frontend-loop-interchange">;
 defm : FlangIgnoredDiagOpt<"target-lifetime">;
 
 // C++ SYCL options
-let Group = sycl_Group in {
 def fsycl : Flag<["-"], "fsycl">,
-  HelpText<"Enables SYCL kernels compilation for device">;
+  Visibility<[ClangOption, CLOption]>,
+  Group<sycl_Group>, HelpText<"Enables SYCL kernels compilation for device">;
 def fno_sycl : Flag<["-"], "fno-sycl">,
-  HelpText<"Disables SYCL kernels compilation for device">;
-def fsycl_device_only : Flag<["-"], "fsycl-device-only">,
-  Alias<offload_device_only>, HelpText<"Compile SYCL kernels for device only">;
-def fsycl_host_only : Flag<["-"], "fsycl-host-only">,
-  Alias<offload_host_only>, HelpText<"Compile SYCL kernels for host only">;
+  Visibility<[ClangOption, CLOption]>,
+  Group<sycl_Group>, HelpText<"Disables SYCL kernels compilation for device">;
 def sycl_link : Flag<["--"], "sycl-link">, Flags<[HelpHidden]>,
-  HelpText<"Perform link through clang-sycl-linker via the target "
+  Visibility<[ClangOption, CLOption]>,
+  Group<sycl_Group>, HelpText<"Perform link through clang-sycl-linker via the target "
   "offloading toolchain.">;
-} // let Group = sycl_Group
-
 // OS-specific options
 let Flags = [TargetSpecific] in {
 defm android_pad_segment : BooleanFFlag<"android-pad-segment">, Group<f_Group>;

clang/include/clang/Driver/ToolChain.h

@@ -762,10 +762,6 @@ class ToolChain {
   virtual void AddHIPIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                  llvm::opt::ArgStringList &CC1Args) const;
 
-  /// Add arguments to use system-specific SYCL includes.
-  virtual void AddSYCLIncludeArgs(const llvm::opt::ArgList &DriverArgs,
-                                  llvm::opt::ArgStringList &CC1Args) const;
-
   /// Add arguments to use MCU GCC toolchain includes.
   virtual void AddIAMCUIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                                    llvm::opt::ArgStringList &CC1Args) const;

clang/lib/Driver/Action.cpp

@@ -111,8 +111,6 @@ std::string Action::getOffloadingKindPrefix() const {
     return "device-openmp";
   case OFK_HIP:
     return "device-hip";
-  case OFK_SYCL:
-    return "device-sycl";
 
     // TODO: Add other programming models here.
   }
@@ -130,8 +128,6 @@ std::string Action::getOffloadingKindPrefix() const {
     Res += "-hip";
   if (ActiveOffloadKindMask & OFK_OpenMP)
     Res += "-openmp";
-  if (ActiveOffloadKindMask & OFK_SYCL)
-    Res += "-sycl";
 
   // TODO: Add other programming models here.
 
@@ -168,8 +164,6 @@ StringRef Action::GetOffloadKindName(OffloadKind Kind) {
     return "openmp";
   case OFK_HIP:
     return "hip";
-  case OFK_SYCL:
-    return "sycl";
 
     // TODO: Add other programming models here.
   }
@@ -326,7 +320,7 @@ void OffloadAction::DeviceDependences::add(Action &A, const ToolChain &TC,
   DeviceBoundArchs.push_back(BoundArch);
 
   // Add each active offloading kind from a mask.
-  for (OffloadKind OKind : {OFK_OpenMP, OFK_Cuda, OFK_HIP, OFK_SYCL})
+  for (OffloadKind OKind : {OFK_OpenMP, OFK_Cuda, OFK_HIP})
     if (OKind & OffloadKindMask)
       DeviceOffloadKinds.push_back(OKind);
 }

clang/lib/Driver/CMakeLists.txt

@@ -77,7 +77,6 @@ add_clang_library(clangDriver
   ToolChains/RISCVToolchain.cpp
   ToolChains/Solaris.cpp
   ToolChains/SPIRV.cpp
-  ToolChains/SYCL.cpp
   ToolChains/TCE.cpp
   ToolChains/UEFI.cpp
   ToolChains/VEToolchain.cpp

clang/lib/Driver/Compilation.cpp

@@ -217,11 +217,10 @@ static bool ActionFailed(const Action *A,
   if (FailingCommands.empty())
     return false;
 
-  // CUDA/HIP/SYCL can have the same input source code compiled multiple times
-  // so do not compile again if there are already failures. It is OK to abort
-  // the CUDA/HIP/SYCL pipeline on errors.
-  if (A->isOffloading(Action::OFK_Cuda) || A->isOffloading(Action::OFK_HIP) ||
-      A->isOffloading(Action::OFK_SYCL))
+  // CUDA/HIP can have the same input source code compiled multiple times so do
+  // not compiled again if there are already failures. It is OK to abort the
+  // CUDA pipeline on errors.
+  if (A->isOffloading(Action::OFK_Cuda) || A->isOffloading(Action::OFK_HIP))
     return true;
 
   for (const auto &CI : FailingCommands)

clang/lib/Driver/Driver.cpp

@@ -43,7 +43,6 @@
 #include "ToolChains/PS4CPU.h"
 #include "ToolChains/RISCVToolchain.h"
 #include "ToolChains/SPIRV.h"
-#include "ToolChains/SYCL.h"
 #include "ToolChains/Solaris.h"
 #include "ToolChains/TCE.h"
 #include "ToolChains/UEFI.h"
@@ -782,27 +781,6 @@ Driver::OpenMPRuntimeKind Driver::getOpenMPRuntime(const ArgList &Args) const {
   return RT;
 }
 
-static const char *getDefaultSYCLArch(Compilation &C) {
-  // If -fsycl is supplied we will assume SPIR-V
-  if (C.getDefaultToolChain().getTriple().isArch32Bit())
-    return "spirv32";
-  return "spirv64";
-}
-
-static bool addSYCLDefaultTriple(Compilation &C,
-                                 SmallVectorImpl<llvm::Triple> &SYCLTriples) {
-  for (const auto &SYCLTriple : SYCLTriples) {
-    if (SYCLTriple.getSubArch() == llvm::Triple::NoSubArch &&
-        SYCLTriple.isSPIROrSPIRV())
-      return false;
-  }
-  // Add the default triple as it was not found.
-  llvm::Triple DefaultTriple =
-      C.getDriver().getSYCLDeviceTriple(getDefaultSYCLArch(C));
-  SYCLTriples.insert(SYCLTriples.begin(), DefaultTriple);
-  return true;
-}
-
 void Driver::CreateOffloadingDeviceToolChains(Compilation &C,
                                               InputList &Inputs) {
 
@@ -1016,41 +994,6 @@ void Driver::CreateOffloadingDeviceToolChains(Compilation &C,
     return;
   }
 
-  //
-  // SYCL
-  //
-  // We need to generate a SYCL toolchain if the user specified -fsycl.
-  bool IsSYCL = C.getInputArgs().hasFlag(options::OPT_fsycl,
-                                         options::OPT_fno_sycl, false);
-
-  auto argSYCLIncompatible = [&](OptSpecifier OptId) {
-    if (!IsSYCL)
-      return;
-    if (Arg *IncompatArg = C.getInputArgs().getLastArg(OptId))
-      Diag(clang::diag::err_drv_argument_not_allowed_with)
-          << IncompatArg->getSpelling() << "-fsycl";
-  };
-  // -static-libstdc++ is not compatible with -fsycl.
-  argSYCLIncompatible(options::OPT_static_libstdcxx);
-  // -ffreestanding cannot be used with -fsycl
-  argSYCLIncompatible(options::OPT_ffreestanding);
-
-  llvm::SmallVector<llvm::Triple, 4> UniqueSYCLTriplesVec;
-
-  if (IsSYCL) {
-    addSYCLDefaultTriple(C, UniqueSYCLTriplesVec);
-
-    // We'll need to use the SYCL and host triples as the key into
-    // getOffloadingDeviceToolChain, because the device toolchains we're
-    // going to create will depend on both.
-    const ToolChain *HostTC = C.getSingleOffloadToolChain<Action::OFK_Host>();
-    for (const auto &TT : UniqueSYCLTriplesVec) {
-      auto SYCLTC = &getOffloadingDeviceToolChain(C.getInputArgs(), TT, *HostTC,
-                                                  Action::OFK_SYCL);
-      C.addOffloadDeviceToolChain(SYCLTC, Action::OFK_SYCL);
-    }
-  }
-
   //
   // TODO: Add support for other offloading programming models here.
   //
@@ -2084,20 +2027,6 @@ void Driver::PrintHelp(bool ShowHidden) const {
                       VisibilityMask);
 }
 
-llvm::Triple Driver::getSYCLDeviceTriple(StringRef TargetArch) const {
-  SmallVector<StringRef, 5> SYCLAlias = {"spir", "spir64", "spirv32",
-                                         "spirv64"};
-  if (std::find(SYCLAlias.begin(), SYCLAlias.end(), TargetArch) !=
-      SYCLAlias.end()) {
-    llvm::Triple TT;
-    TT.setArchName(TargetArch);
-    TT.setVendor(llvm::Triple::UnknownVendor);
-    TT.setOS(llvm::Triple::UnknownOS);
-    return TT;
-  }
-  return llvm::Triple(TargetArch);
-}
-
 void Driver::PrintVersion(const Compilation &C, raw_ostream &OS) const {
   if (IsFlangMode()) {
     OS << getClangToolFullVersion("flang") << '\n';
@@ -4255,7 +4184,6 @@ void Driver::BuildActions(Compilation &C, DerivedArgList &Args,
 
   bool UseNewOffloadingDriver =
       C.isOffloadingHostKind(Action::OFK_OpenMP) ||
-      C.isOffloadingHostKind(Action::OFK_SYCL) ||
       Args.hasFlag(options::OPT_foffload_via_llvm,
                    options::OPT_fno_offload_via_llvm, false) ||
       Args.hasFlag(options::OPT_offload_new_driver,
@@ -4666,8 +4594,6 @@ Driver::getOffloadArchs(Compilation &C, const llvm::opt::DerivedArgList &Args,
       Archs.insert(OffloadArchToString(OffloadArch::HIPDefault));
     else if (Kind == Action::OFK_OpenMP)
       Archs.insert(StringRef());
-    else if (Kind == Action::OFK_SYCL)
-      Archs.insert(StringRef());
   } else {
     Args.ClaimAllArgs(options::OPT_offload_arch_EQ);
     Args.ClaimAllArgs(options::OPT_no_offload_arch_EQ);
@@ -4692,7 +4618,7 @@ Action *Driver::BuildOffloadingActions(Compilation &C,
   OffloadAction::DeviceDependences DDeps;
 
   const Action::OffloadKind OffloadKinds[] = {
-      Action::OFK_OpenMP, Action::OFK_Cuda, Action::OFK_HIP, Action::OFK_SYCL};
+      Action::OFK_OpenMP, Action::OFK_Cuda, Action::OFK_HIP};
 
   for (Action::OffloadKind Kind : OffloadKinds) {
     SmallVector<const ToolChain *, 2> ToolChains;
@@ -4737,11 +4663,6 @@ Action *Driver::BuildOffloadingActions(Compilation &C,
         break;
       }
 
-      // Assemble actions are not used for the SYCL device side.  Both compile
-      // and backend actions are used to generate IR and textual IR if needed.
-      if (Kind == Action::OFK_SYCL && Phase == phases::Assemble)
-        continue;
-
       auto TCAndArch = TCAndArchs.begin();
       for (Action *&A : DeviceActions) {
         if (A->getType() == types::TY_Nothing)
@@ -4980,7 +4901,6 @@ Action *Driver::ConstructPhaseAction(
       return C.MakeAction<BackendJobAction>(Input, Output);
     }
     if (Args.hasArg(options::OPT_emit_llvm) ||
-        TargetDeviceOffloadKind == Action::OFK_SYCL ||
         (((Input->getOffloadingToolChain() &&
            Input->getOffloadingToolChain()->getTriple().isAMDGPU()) ||
           TargetDeviceOffloadKind == Action::OFK_HIP) &&
@@ -6672,19 +6592,6 @@ const ToolChain &Driver::getOffloadingDeviceToolChain(
                                                            HostTC, Args);
       break;
     }
-    case Action::OFK_SYCL:
-      switch (Target.getArch()) {
-      case llvm::Triple::spir:
-      case llvm::Triple::spir64:
-      case llvm::Triple::spirv32:
-      case llvm::Triple::spirv64:
-        TC = std::make_unique<toolchains::SYCLToolChain>(*this, Target, HostTC,
-                                                         Args);
-        break;
-      default:
-        break;
-      }
-      break;
     default:
       break;
     }

clang/lib/Driver/ToolChain.cpp

@@ -1487,9 +1487,6 @@ void ToolChain::AddCudaIncludeArgs(const ArgList &DriverArgs,
 void ToolChain::AddHIPIncludeArgs(const ArgList &DriverArgs,
                                   ArgStringList &CC1Args) const {}
 
-void ToolChain::AddSYCLIncludeArgs(const ArgList &DriverArgs,
-                                   ArgStringList &CC1Args) const {}
-
 llvm::SmallVector<ToolChain::BitCodeLibraryInfo, 12>
 ToolChain::getDeviceLibs(const ArgList &DriverArgs) const {
   return {};