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//===- BPF.cpp ------------------------------------------------------------===//
//
// 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 "ABIInfoImpl.h"
#include "TargetInfo.h"
using namespace clang;
using namespace clang::CodeGen;
//===----------------------------------------------------------------------===//
// BPF ABI Implementation
//===----------------------------------------------------------------------===//
namespace {
class BPFABIInfo : public DefaultABIInfo {
public:
BPFABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
ABIArgInfo classifyArgumentType(QualType Ty) const {
Ty = useFirstFieldIfTransparentUnion(Ty);
if (isAggregateTypeForABI(Ty)) {
uint64_t Bits = getContext().getTypeSize(Ty);
if (Bits == 0)
return ABIArgInfo::getIgnore();
// If the aggregate needs 1 or 2 registers, do not use reference.
if (Bits <= 128) {
llvm::Type *CoerceTy;
if (Bits <= 64) {
CoerceTy =
llvm::IntegerType::get(getVMContext(), llvm::alignTo(Bits, 8));
} else {
llvm::Type *RegTy = llvm::IntegerType::get(getVMContext(), 64);
CoerceTy = llvm::ArrayType::get(RegTy, 2);
}
return ABIArgInfo::getDirect(CoerceTy);
} else {
return getNaturalAlignIndirect(Ty,
getDataLayout().getAllocaAddrSpace());
}
}
if (const EnumType *EnumTy = Ty->getAs<EnumType>())
Ty = EnumTy->getDecl()->getIntegerType();
ASTContext &Context = getContext();
if (const auto *EIT = Ty->getAs<BitIntType>())
if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty))
return getNaturalAlignIndirect(Ty,
getDataLayout().getAllocaAddrSpace());
return (isPromotableIntegerTypeForABI(Ty) ? ABIArgInfo::getExtend(Ty)
: ABIArgInfo::getDirect());
}
ABIArgInfo classifyReturnType(QualType RetTy) const {
if (RetTy->isVoidType())
return ABIArgInfo::getIgnore();
if (isAggregateTypeForABI(RetTy))
return getNaturalAlignIndirect(RetTy,
getDataLayout().getAllocaAddrSpace());
// Treat an enum type as its underlying type.
if (const EnumType *EnumTy = RetTy->getAs<EnumType>())
RetTy = EnumTy->getDecl()->getIntegerType();
ASTContext &Context = getContext();
if (const auto *EIT = RetTy->getAs<BitIntType>())
if (EIT->getNumBits() > Context.getTypeSize(Context.Int128Ty))
return getNaturalAlignIndirect(RetTy,
getDataLayout().getAllocaAddrSpace());
// Caller will do necessary sign/zero extension.
return ABIArgInfo::getDirect();
}
void computeInfo(CGFunctionInfo &FI) const override {
FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
for (auto &I : FI.arguments())
I.info = classifyArgumentType(I.type);
}
};
class BPFTargetCodeGenInfo : public TargetCodeGenInfo {
public:
BPFTargetCodeGenInfo(CodeGenTypes &CGT)
: TargetCodeGenInfo(std::make_unique<BPFABIInfo>(CGT)) {}
};
}
std::unique_ptr<TargetCodeGenInfo>
CodeGen::createBPFTargetCodeGenInfo(CodeGenModule &CGM) {
return std::make_unique<BPFTargetCodeGenInfo>(CGM.getTypes());
}
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