clang/lib/Basic/Targets/NVPTX.h

   1 //===--- NVPTX.h - Declare NVPTX target feature support ---------*- 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 // This file declares NVPTX TargetInfo objects.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H
  14 #define LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H
  15
  16 #include "clang/Basic/Cuda.h"
  17 #include "clang/Basic/TargetInfo.h"
  18 #include "clang/Basic/TargetOptions.h"
  19 #include "llvm/ADT/Triple.h"
  20 #include "llvm/Support/Compiler.h"
  21
  22 namespace clang {
  23 namespace targets {
  24
  25 static const unsigned NVPTXAddrSpaceMap[] = {
  26     0, // Default
  27     1, // opencl_global
  28     3, // opencl_local
  29     4, // opencl_constant
  30     0, // opencl_private
  31     // FIXME: generic has to be added to the target
  32     0, // opencl_generic
  33     1, // opencl_global_device
  34     1, // opencl_global_host
  35     1, // cuda_device
  36     4, // cuda_constant
  37     3, // cuda_shared
  38     1, // sycl_global
  39     1, // sycl_global_device
  40     1, // sycl_global_host
  41     3, // sycl_local
  42     0, // sycl_private
  43     0, // ptr32_sptr
  44     0, // ptr32_uptr
  45     0  // ptr64
  46 };
  47
  48 /// The DWARF address class. Taken from
  49 /// https://docs.nvidia.com/cuda/archive/10.0/ptx-writers-guide-to-interoperability/index.html#cuda-specific-dwarf
  50 static const int NVPTXDWARFAddrSpaceMap[] = {
  51     -1, // Default, opencl_private or opencl_generic - not defined
  52     5,  // opencl_global
  53     -1,
  54     8,  // opencl_local or cuda_shared
  55     4,  // opencl_constant or cuda_constant
  56 };
  57
  58 class LLVM_LIBRARY_VISIBILITY NVPTXTargetInfo : public TargetInfo {
  59   static const char *const GCCRegNames[];
  60   static const Builtin::Info BuiltinInfo[];
  61   CudaArch GPU;
  62   uint32_t PTXVersion;
  63   std::unique_ptr<TargetInfo> HostTarget;
  64
  65 public:
  66   NVPTXTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts,
  67                   unsigned TargetPointerWidth);
  68
  69   void getTargetDefines(const LangOptions &Opts,
  70                         MacroBuilder &Builder) const override;
  71
  72   ArrayRef<Builtin::Info> getTargetBuiltins() const override;
  73
  74   bool
  75   initFeatureMap(llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags,
  76                  StringRef CPU,
  77                  const std::vector<std::string> &FeaturesVec) const override {
  78     Features[CudaArchToString(GPU)] = true;
  79     Features["ptx" + std::to_string(PTXVersion)] = true;
  80     return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
  81   }
  82
  83   bool hasFeature(StringRef Feature) const override;
  84
  85   ArrayRef<const char *> getGCCRegNames() const override;
  86
  87   ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
  88     // No aliases.
  89     return None;
  90   }
  91
  92   bool validateAsmConstraint(const char *&Name,
  93                              TargetInfo::ConstraintInfo &Info) const override {
  94     switch (*Name) {
  95     default:
  96       return false;
  97     case 'c':
  98     case 'h':
  99     case 'r':
 100     case 'l':
 101     case 'f':
 102     case 'd':
 103       Info.setAllowsRegister();
 104       return true;
 105     }
 106   }
 107
 108   const char *getClobbers() const override {
 109     // FIXME: Is this really right?
 110     return "";
 111   }
 112
 113   BuiltinVaListKind getBuiltinVaListKind() const override {
 114     // FIXME: implement
 115     return TargetInfo::CharPtrBuiltinVaList;
 116   }
 117
 118   bool isValidCPUName(StringRef Name) const override {
 119     return StringToCudaArch(Name) != CudaArch::UNKNOWN;
 120   }
 121
 122   void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override {
 123     for (int i = static_cast<int>(CudaArch::SM_20);
 124          i < static_cast<int>(CudaArch::Generic); ++i)
 125       Values.emplace_back(CudaArchToString(static_cast<CudaArch>(i)));
 126   }
 127
 128   bool setCPU(const std::string &Name) override {
 129     GPU = StringToCudaArch(Name);
 130     return GPU != CudaArch::UNKNOWN;
 131   }
 132
 133   void setSupportedOpenCLOpts() override {
 134     auto &Opts = getSupportedOpenCLOpts();
 135     Opts["cl_clang_storage_class_specifiers"] = true;
 136     Opts["__cl_clang_function_pointers"] = true;
 137     Opts["__cl_clang_variadic_functions"] = true;
 138     Opts["__cl_clang_non_portable_kernel_param_types"] = true;
 139     Opts["__cl_clang_bitfields"] = true;
 140
 141     Opts["cl_khr_fp64"] = true;
 142     Opts["__opencl_c_fp64"] = true;
 143     Opts["cl_khr_byte_addressable_store"] = true;
 144     Opts["cl_khr_global_int32_base_atomics"] = true;
 145     Opts["cl_khr_global_int32_extended_atomics"] = true;
 146     Opts["cl_khr_local_int32_base_atomics"] = true;
 147     Opts["cl_khr_local_int32_extended_atomics"] = true;
 148   }
 149
 150   const llvm::omp::GV &getGridValue() const override {
 151     return llvm::omp::NVPTXGridValues;
 152   }
 153
 154   /// \returns If a target requires an address within a target specific address
 155   /// space \p AddressSpace to be converted in order to be used, then return the
 156   /// corresponding target specific DWARF address space.
 157   ///
 158   /// \returns Otherwise return None and no conversion will be emitted in the
 159   /// DWARF.
 160   Optional<unsigned>
 161   getDWARFAddressSpace(unsigned AddressSpace) const override {
 162     if (AddressSpace >= llvm::array_lengthof(NVPTXDWARFAddrSpaceMap) ||
 163         NVPTXDWARFAddrSpaceMap[AddressSpace] < 0)
 164       return llvm::None;
 165     return NVPTXDWARFAddrSpaceMap[AddressSpace];
 166   }
 167
 168   CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
 169     // CUDA compilations support all of the host's calling conventions.
 170     //
 171     // TODO: We should warn if you apply a non-default CC to anything other than
 172     // a host function.
 173     if (HostTarget)
 174       return HostTarget->checkCallingConvention(CC);
 175     return CCCR_Warning;
 176   }
 177
 178   bool hasBitIntType() const override { return true; }
 179 };
 180 } // namespace targets
 181 } // namespace clang
 182 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_NVPTX_H