19af8581d5
Translates `cbuffer` declaration blocks to `target("dx.CBuffer")` type. Creates global variables in `hlsl_constant` address space for all `cbuffer` constant and adds metadata describing which global constant belongs to which constant buffer. For explicit constant buffer layout information an explicit layout type `target("dx.Layout")` is used. This might change in the future.
The constant globals are temporary and will be removed in upcoming pass that will translate `load` instructions in the `hlsl_constant` address space to constant buffer load intrinsics calls off a CBV handle (#124630, #112992).
See [Constant buffer design
doc](https://github.com/llvm/wg-hlsl/pull/94) for more details.
Fixes #113514, #106596
49 lines
1.7 KiB
C++
49 lines
1.7 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<unsigned> *Packoffsets = nullptr);
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private:
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bool layoutField(const clang::FieldDecl *FD, unsigned &EndOffset,
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llvm::SmallVector<unsigned> &Layout,
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llvm::SmallVector<llvm::Type *> &LayoutElements,
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int Packoffset);
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};
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} // namespace CodeGen
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} // namespace clang
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