1 | //===- DirectX.cpp---------------------------------------------------------===// |
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 | #include "ABIInfoImpl.h" |
10 | #include "CodeGenModule.h" |
11 | #include "HLSLBufferLayoutBuilder.h" |
12 | #include "TargetInfo.h" |
13 | #include "clang/AST/Type.h" |
14 | #include "llvm/ADT/SmallVector.h" |
15 | #include "llvm/IR/DerivedTypes.h" |
16 | #include "llvm/IR/Type.h" |
17 | |
18 | using namespace clang; |
19 | using namespace clang::CodeGen; |
20 | |
21 | //===----------------------------------------------------------------------===// |
22 | // Target codegen info implementation for DirectX. |
23 | //===----------------------------------------------------------------------===// |
24 | |
25 | namespace { |
26 | |
27 | class DirectXTargetCodeGenInfo : public TargetCodeGenInfo { |
28 | public: |
29 | DirectXTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT) |
30 | : TargetCodeGenInfo(std::make_unique<DefaultABIInfo>(args&: CGT)) {} |
31 | |
32 | llvm::Type * |
33 | getHLSLType(CodeGenModule &CGM, const Type *T, |
34 | const SmallVector<int32_t> *Packoffsets = nullptr) const override; |
35 | }; |
36 | |
37 | llvm::Type *DirectXTargetCodeGenInfo::getHLSLType( |
38 | CodeGenModule &CGM, const Type *Ty, |
39 | const SmallVector<int32_t> *Packoffsets) const { |
40 | auto *ResType = dyn_cast<HLSLAttributedResourceType>(Val: Ty); |
41 | if (!ResType) |
42 | return nullptr; |
43 | |
44 | llvm::LLVMContext &Ctx = CGM.getLLVMContext(); |
45 | const HLSLAttributedResourceType::Attributes &ResAttrs = ResType->getAttrs(); |
46 | switch (ResAttrs.ResourceClass) { |
47 | case llvm::dxil::ResourceClass::UAV: |
48 | case llvm::dxil::ResourceClass::SRV: { |
49 | // TypedBuffer and RawBuffer both need element type |
50 | QualType ContainedTy = ResType->getContainedType(); |
51 | if (ContainedTy.isNull()) |
52 | return nullptr; |
53 | |
54 | // convert element type |
55 | llvm::Type *ElemType = CGM.getTypes().ConvertTypeForMem(T: ContainedTy); |
56 | |
57 | llvm::StringRef TypeName = |
58 | ResAttrs.RawBuffer ? "dx.RawBuffer" : "dx.TypedBuffer" ; |
59 | SmallVector<unsigned, 3> Ints = {/*IsWriteable*/ ResAttrs.ResourceClass == |
60 | llvm::dxil::ResourceClass::UAV, |
61 | /*IsROV*/ ResAttrs.IsROV}; |
62 | if (!ResAttrs.RawBuffer) { |
63 | const clang::Type *ElemType = ContainedTy->getUnqualifiedDesugaredType(); |
64 | if (ElemType->isVectorType()) |
65 | ElemType = cast<clang::VectorType>(Val: ElemType) |
66 | ->getElementType() |
67 | ->getUnqualifiedDesugaredType(); |
68 | Ints.push_back(/*IsSigned*/ Elt: ElemType->isSignedIntegerType()); |
69 | } |
70 | |
71 | return llvm::TargetExtType::get(Context&: Ctx, Name: TypeName, Types: {ElemType}, Ints); |
72 | } |
73 | case llvm::dxil::ResourceClass::CBuffer: { |
74 | QualType ContainedTy = ResType->getContainedType(); |
75 | if (ContainedTy.isNull() || !ContainedTy->isStructureType()) |
76 | return nullptr; |
77 | |
78 | llvm::Type *BufferLayoutTy = |
79 | HLSLBufferLayoutBuilder(CGM, "dx.Layout" ) |
80 | .createLayoutType(StructType: ContainedTy->getAsStructureType(), Packoffsets); |
81 | if (!BufferLayoutTy) |
82 | return nullptr; |
83 | |
84 | return llvm::TargetExtType::get(Context&: Ctx, Name: "dx.CBuffer" , Types: {BufferLayoutTy}); |
85 | } |
86 | case llvm::dxil::ResourceClass::Sampler: |
87 | llvm_unreachable("dx.Sampler handles are not implemented yet" ); |
88 | break; |
89 | } |
90 | llvm_unreachable("Unknown llvm::dxil::ResourceClass enum" ); |
91 | } |
92 | |
93 | } // namespace |
94 | |
95 | std::unique_ptr<TargetCodeGenInfo> |
96 | CodeGen::createDirectXTargetCodeGenInfo(CodeGenModule &CGM) { |
97 | return std::make_unique<DirectXTargetCodeGenInfo>(args&: CGM.getTypes()); |
98 | } |
99 | |