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//===- CBuffer.cpp - HLSL constant buffer handling ------------------------===//
//
// 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 "llvm/Frontend/HLSL/CBuffer.h"
#include "llvm/Frontend/HLSL/HLSLResource.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
using namespace llvm;
using namespace llvm::hlsl;
static size_t getMemberOffset(GlobalVariable *Handle, size_t Index) {
auto *HandleTy = cast<TargetExtType>(Handle->getValueType());
assert(HandleTy->getName().ends_with(".CBuffer") && "Not a cbuffer type");
assert(HandleTy->getNumTypeParameters() == 1 && "Expected layout type");
auto *LayoutTy = cast<TargetExtType>(HandleTy->getTypeParameter(0));
assert(LayoutTy->getName().ends_with(".Layout") && "Not a layout type");
// Skip the "size" parameter.
size_t ParamIndex = Index + 1;
assert(LayoutTy->getNumIntParameters() > ParamIndex &&
"Not enough parameters");
return LayoutTy->getIntParameter(ParamIndex);
}
std::optional<CBufferMetadata> CBufferMetadata::get(Module &M) {
NamedMDNode *CBufMD = M.getNamedMetadata("hlsl.cbs");
if (!CBufMD)
return std::nullopt;
std::optional<CBufferMetadata> Result({CBufMD});
for (const MDNode *MD : CBufMD->operands()) {
assert(MD->getNumOperands() && "Invalid cbuffer metadata");
auto *Handle = cast<GlobalVariable>(
cast<ValueAsMetadata>(MD->getOperand(0))->getValue());
CBufferMapping &Mapping = Result->Mappings.emplace_back(Handle);
for (int I = 1, E = MD->getNumOperands(); I < E; ++I) {
Metadata *OpMD = MD->getOperand(I);
// Some members may be null if they've been optimized out.
if (!OpMD)
continue;
auto *V = cast<GlobalVariable>(cast<ValueAsMetadata>(OpMD)->getValue());
Mapping.Members.emplace_back(V, getMemberOffset(Handle, I - 1));
}
}
return Result;
}
void CBufferMetadata::eraseFromModule() {
// Remove the cbs named metadata
MD->eraseFromParent();
}
APInt hlsl::translateCBufArrayOffset(const DataLayout &DL, APInt Offset,
ArrayType *Ty) {
int64_t TypeSize = DL.getTypeSizeInBits(Ty->getElementType()) / 8;
int64_t RoundUp = alignTo(TypeSize, Align(CBufferRowSizeInBytes));
return Offset.udiv(TypeSize) * RoundUp;
}
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