1 | //===----- CGHLSLRuntime.h - Interface to HLSL Runtimes -----*- 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 provides an abstract class for HLSL code generation. Concrete |
10 | // subclasses of this implement code generation for specific HLSL |
11 | // runtime libraries. |
12 | // |
13 | //===----------------------------------------------------------------------===// |
14 | |
15 | #ifndef LLVM_CLANG_LIB_CODEGEN_CGHLSLRUNTIME_H |
16 | #define LLVM_CLANG_LIB_CODEGEN_CGHLSLRUNTIME_H |
17 | |
18 | #include "llvm/IR/IRBuilder.h" |
19 | |
20 | #include "clang/Basic/HLSLRuntime.h" |
21 | |
22 | #include "llvm/ADT/SmallVector.h" |
23 | #include "llvm/ADT/StringRef.h" |
24 | #include "llvm/Frontend/HLSL/HLSLResource.h" |
25 | |
26 | #include <optional> |
27 | #include <vector> |
28 | |
29 | namespace llvm { |
30 | class GlobalVariable; |
31 | class Function; |
32 | class StructType; |
33 | } // namespace llvm |
34 | |
35 | namespace clang { |
36 | class VarDecl; |
37 | class ParmVarDecl; |
38 | class HLSLBufferDecl; |
39 | class HLSLResourceBindingAttr; |
40 | class Type; |
41 | class DeclContext; |
42 | |
43 | class FunctionDecl; |
44 | |
45 | namespace CodeGen { |
46 | |
47 | class CodeGenModule; |
48 | |
49 | class CGHLSLRuntime { |
50 | public: |
51 | struct BufferResBinding { |
52 | // The ID like 2 in register(b2, space1). |
53 | std::optional<unsigned> Reg; |
54 | // The Space like 1 is register(b2, space1). |
55 | // Default value is 0. |
56 | unsigned Space; |
57 | BufferResBinding(HLSLResourceBindingAttr *Attr); |
58 | }; |
59 | struct Buffer { |
60 | Buffer(const HLSLBufferDecl *D); |
61 | llvm::StringRef Name; |
62 | // IsCBuffer - Whether the buffer is a cbuffer (and not a tbuffer). |
63 | bool IsCBuffer; |
64 | BufferResBinding Binding; |
65 | // Global variable and offset for each constant. |
66 | std::vector<std::pair<llvm::GlobalVariable *, unsigned>> Constants; |
67 | llvm::StructType *LayoutStruct = nullptr; |
68 | }; |
69 | |
70 | protected: |
71 | CodeGenModule &CGM; |
72 | |
73 | llvm::Value *emitInputSemantic(llvm::IRBuilder<> &B, const ParmVarDecl &D, |
74 | llvm::Type *Ty); |
75 | |
76 | public: |
77 | CGHLSLRuntime(CodeGenModule &CGM) : CGM(CGM) {} |
78 | virtual ~CGHLSLRuntime() {} |
79 | |
80 | void annotateHLSLResource(const VarDecl *D, llvm::GlobalVariable *GV); |
81 | void generateGlobalCtorDtorCalls(); |
82 | |
83 | void addBuffer(const HLSLBufferDecl *D); |
84 | void finishCodeGen(); |
85 | |
86 | void setHLSLEntryAttributes(const FunctionDecl *FD, llvm::Function *Fn); |
87 | |
88 | void emitEntryFunction(const FunctionDecl *FD, llvm::Function *Fn); |
89 | void setHLSLFunctionAttributes(llvm::Function *, const FunctionDecl *); |
90 | |
91 | private: |
92 | void addBufferResourceAnnotation(llvm::GlobalVariable *GV, |
93 | llvm::hlsl::ResourceClass RC, |
94 | llvm::hlsl::ResourceKind RK, bool IsROV, |
95 | llvm::hlsl::ElementType ET, |
96 | BufferResBinding &Binding); |
97 | void addConstant(VarDecl *D, Buffer &CB); |
98 | void addBufferDecls(const DeclContext *DC, Buffer &CB); |
99 | llvm::SmallVector<Buffer> Buffers; |
100 | }; |
101 | |
102 | } // namespace CodeGen |
103 | } // namespace clang |
104 | |
105 | #endif |
106 | |