73e12de062
Processes `HLSLResourceBindingAttr` attributes that represent `register(c#)` annotations on default constant buffer declarations and applies its value to the buffer layout. Any default buffer declarations without an explicit `register(c#)` annotation are placed after the elements with explicit layout. This PR also adds a test case for a `cbuffer` that does not have `packoffset` on all declarations. Same layout rules apply here as well. Fixes #126791
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
//===- HLSLBufferLayoutBuilder.h ------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/DerivedTypes.h"
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namespace clang {
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class RecordType;
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class FieldDecl;
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namespace CodeGen {
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class CodeGenModule;
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//===----------------------------------------------------------------------===//
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// Implementation of constant buffer layout common between DirectX and
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// SPIR/SPIR-V.
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//===----------------------------------------------------------------------===//
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class HLSLBufferLayoutBuilder {
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private:
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CodeGenModule &CGM;
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llvm::StringRef LayoutTypeName;
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public:
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HLSLBufferLayoutBuilder(CodeGenModule &CGM, llvm::StringRef LayoutTypeName)
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: CGM(CGM), LayoutTypeName(LayoutTypeName) {}
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// Returns LLVM target extension type with the name LayoutTypeName
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// for given structure type and layout data. The first number in
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// the Layout is the size followed by offsets for each struct element.
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llvm::TargetExtType *
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createLayoutType(const RecordType *StructType,
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const llvm::SmallVector<int32_t> *Packoffsets = nullptr);
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private:
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bool layoutField(const clang::FieldDecl *FD, unsigned &EndOffset,
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unsigned &FieldOffset, llvm::Type *&FieldType,
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int Packoffset = -1);
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};
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} // namespace CodeGen
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} // namespace clang
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