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//===- DirectX.cpp---------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "ABIInfoImpl.h"
#include "CodeGenModule.h"
#include "HLSLBufferLayoutBuilder.h"
#include "TargetInfo.h"
#include "clang/AST/Type.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Type.h"
using namespace clang;
using namespace clang::CodeGen;
//===----------------------------------------------------------------------===//
// Target codegen info implementation for DirectX.
//===----------------------------------------------------------------------===//
namespace {
class DirectXTargetCodeGenInfo : public TargetCodeGenInfo {
public:
DirectXTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT)
: TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(CGT)) {}
llvm::Type *
getHLSLType(CodeGenModule &CGM, const Type *T,
const SmallVector<int32_t> *Packoffsets = nullptr) const override;
};
llvm::Type *DirectXTargetCodeGenInfo::getHLSLType(
CodeGenModule &CGM, const Type *Ty,
const SmallVector<int32_t> *Packoffsets) const {
auto *ResType = dyn_cast<HLSLAttributedResourceType>(Ty);
if (!ResType)
return nullptr;
llvm::LLVMContext &Ctx = CGM.getLLVMContext();
const HLSLAttributedResourceType::Attributes &ResAttrs = ResType->getAttrs();
switch (ResAttrs.ResourceClass) {
case llvm::dxil::ResourceClass::UAV:
case llvm::dxil::ResourceClass::SRV: {
// TypedBuffer and RawBuffer both need element type
QualType ContainedTy = ResType->getContainedType();
if (ContainedTy.isNull())
return nullptr;
// convert element type
llvm::Type *ElemType = CGM.getTypes().ConvertTypeForMem(ContainedTy);
llvm::StringRef TypeName =
ResAttrs.RawBuffer ? "dx.RawBuffer" : "dx.TypedBuffer";
SmallVector<unsigned, 3> Ints = {/*IsWriteable*/ ResAttrs.ResourceClass ==
llvm::dxil::ResourceClass::UAV,
/*IsROV*/ ResAttrs.IsROV};
if (!ResAttrs.RawBuffer) {
const clang::Type *ElemType = ContainedTy->getUnqualifiedDesugaredType();
if (ElemType->isVectorType())
ElemType = cast<clang::VectorType>(ElemType)
->getElementType()
->getUnqualifiedDesugaredType();
Ints.push_back(/*IsSigned*/ ElemType->isSignedIntegerType());
}
return llvm::TargetExtType::get(Ctx, TypeName, {ElemType}, Ints);
}
case llvm::dxil::ResourceClass::CBuffer: {
QualType ContainedTy = ResType->getContainedType();
if (ContainedTy.isNull() || !ContainedTy->isStructureType())
return nullptr;
llvm::Type *BufferLayoutTy =
HLSLBufferLayoutBuilder(CGM, "dx.Layout")
.createLayoutType(ContainedTy->getAsStructureType(), Packoffsets);
if (!BufferLayoutTy)
return nullptr;
return llvm::TargetExtType::get(Ctx, "dx.CBuffer", {BufferLayoutTy});
}
case llvm::dxil::ResourceClass::Sampler:
llvm_unreachable("dx.Sampler handles are not implemented yet");
break;
}
llvm_unreachable("Unknown llvm::dxil::ResourceClass enum");
}
} // namespace
std::unique_ptr<TargetCodeGenInfo>
CodeGen::createDirectXTargetCodeGenInfo(CodeGenModule &CGM) {
return std::make_unique<DirectXTargetCodeGenInfo>(CGM.getTypes());
}
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