DirectX.h

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//===--- DirectX.h - Declare DirectX target feature support -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares DXIL TargetInfo objects.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_DIRECTX_H
#define LLVM_CLANG_LIB_BASIC_TARGETS_DIRECTX_H
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/TargetOptions.h"
#include "llvm/Support/Compiler.h"
#include "llvm/TargetParser/Triple.h"
 
namespace clang {
namespace targets {
 
static const unsigned DirectXAddrSpaceMap[] = {
    0, // Default
    1, // opencl_global
    3, // opencl_local
    2, // opencl_constant
    0, // opencl_private
    4, // opencl_generic
    5, // opencl_global_device
    6, // opencl_global_host
    0, // cuda_device
    0, // cuda_constant
    0, // cuda_shared
    // SYCL address space values for this map are dummy
    0, // sycl_global
    0, // sycl_global_device
    0, // sycl_global_host
    0, // sycl_local
    0, // sycl_private
    0, // ptr32_sptr
    0, // ptr32_uptr
    0, // ptr64
    3, // hlsl_groupshared
    2, // hlsl_constant
    0, // hlsl_private
    0, // hlsl_device
    0, // hlsl_input
    // Wasm address space values for this target are dummy values,
    // as it is only enabled for Wasm targets.
    20, // wasm_funcref
};
 
class LLVM_LIBRARY_VISIBILITY DirectXTargetInfo : public TargetInfo {
public:
  DirectXTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
      : TargetInfo(Triple) {
    TLSSupported = false;
    VLASupported = false;
    AddrSpaceMap = &DirectXAddrSpaceMap;
    UseAddrSpaceMapMangling = true;
    HasFastHalfType = true;
    HasFloat16 = true;
    NoAsmVariants = true;
    PlatformMinVersion = Triple.getOSVersion();
    PlatformName = llvm::Triple::getOSTypeName(Triple.getOS());
    // TODO: We need to align vectors on the element size generally, but for now
    // we hard code this for 3-element 32- and 64-bit vectors as a workaround.
    // See https://github.com/llvm/llvm-project/issues/123968
    resetDataLayout("e-m:e-p:32:32-i1:32-i8:8-i16:16-i32:32-i64:64-f16:16-f32:"
                    "32-f64:64-n8:16:32:64-v48:16:16-v96:32:32-v192:64:64");
    TheCXXABI.set(TargetCXXABI::GenericItanium);
  }
  bool useFP16ConversionIntrinsics() const override { return false; }
  void getTargetDefines(const LangOptions &Opts,
                        MacroBuilder &Builder) const override;
 
  bool hasFeature(StringRef Feature) const override {
    return Feature == "directx";
  }
 
  llvm::SmallVector<Builtin::InfosShard> getTargetBuiltins() const override;
 
  std::string_view getClobbers() const override { return ""; }
 
  ArrayRef<const char *> getGCCRegNames() const override { return {}; }
 
  bool validateAsmConstraint(const char *&Name,
                             TargetInfo::ConstraintInfo &info) const override {
    return true;
  }
 
  ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
    return {};
  }
 
  BuiltinVaListKind getBuiltinVaListKind() const override {
    return TargetInfo::VoidPtrBuiltinVaList;
  }
 
  void adjust(DiagnosticsEngine &Diags, LangOptions &Opts,
              const TargetInfo *Aux) override {
    TargetInfo::adjust(Diags, Opts, Aux);
    // The static values this addresses do not apply outside of the same thread
    // This protection is neither available nor needed
    Opts.ThreadsafeStatics = false;
  }
};
 
} // namespace targets
} // namespace clang
 
#endif // LLVM_CLANG_LIB_BASIC_TARGETS_DIRECTX_H