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//===-- RISCVELFStreamer.cpp - RISC-V ELF Target Streamer Methods ---------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file provides RISC-V specific target streamer methods.
//
//===----------------------------------------------------------------------===//
#include "RISCVELFStreamer.h"
#include "RISCVAsmBackend.h"
#include "RISCVBaseInfo.h"
#include "RISCVMCTargetDesc.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/RISCVAttributes.h"
using namespace llvm;
// This part is for ELF object output.
RISCVTargetELFStreamer::RISCVTargetELFStreamer(MCStreamer &S,
const MCSubtargetInfo &STI)
: RISCVTargetStreamer(S), CurrentVendor("riscv"), STI(STI) {
MCAssembler &MCA = getStreamer().getAssembler();
const FeatureBitset &Features = STI.getFeatureBits();
auto &MAB = static_cast<RISCVAsmBackend &>(MCA.getBackend());
setTargetABI(RISCVABI::computeTargetABI(STI.getTargetTriple(), Features,
MAB.getTargetOptions().getABIName()));
}
RISCVELFStreamer &RISCVTargetELFStreamer::getStreamer() {
return static_cast<RISCVELFStreamer &>(Streamer);
}
void RISCVTargetELFStreamer::emitDirectiveOptionPush() {}
void RISCVTargetELFStreamer::emitDirectiveOptionPop() {}
void RISCVTargetELFStreamer::emitDirectiveOptionPIC() {}
void RISCVTargetELFStreamer::emitDirectiveOptionNoPIC() {}
void RISCVTargetELFStreamer::emitDirectiveOptionRVC() {}
void RISCVTargetELFStreamer::emitDirectiveOptionNoRVC() {}
void RISCVTargetELFStreamer::emitDirectiveOptionRelax() {}
void RISCVTargetELFStreamer::emitDirectiveOptionNoRelax() {}
void RISCVTargetELFStreamer::emitAttribute(unsigned Attribute, unsigned Value) {
getStreamer().setAttributeItem(Attribute, Value, /*OverwriteExisting=*/true);
}
void RISCVTargetELFStreamer::emitTextAttribute(unsigned Attribute,
StringRef String) {
getStreamer().setAttributeItem(Attribute, String, /*OverwriteExisting=*/true);
}
void RISCVTargetELFStreamer::emitIntTextAttribute(unsigned Attribute,
unsigned IntValue,
StringRef StringValue) {
getStreamer().setAttributeItems(Attribute, IntValue, StringValue,
/*OverwriteExisting=*/true);
}
void RISCVTargetELFStreamer::finishAttributeSection() {
RISCVELFStreamer &S = getStreamer();
if (S.Contents.empty())
return;
S.emitAttributesSection(CurrentVendor, ".riscv.attributes",
ELF::SHT_RISCV_ATTRIBUTES, AttributeSection);
}
void RISCVTargetELFStreamer::finish() {
RISCVTargetStreamer::finish();
MCAssembler &MCA = getStreamer().getAssembler();
const FeatureBitset &Features = STI.getFeatureBits();
RISCVABI::ABI ABI = getTargetABI();
unsigned EFlags = MCA.getELFHeaderEFlags();
if (Features[RISCV::FeatureStdExtC])
EFlags |= ELF::EF_RISCV_RVC;
if (Features[RISCV::FeatureStdExtZtso])
EFlags |= ELF::EF_RISCV_TSO;
switch (ABI) {
case RISCVABI::ABI_ILP32:
case RISCVABI::ABI_LP64:
break;
case RISCVABI::ABI_ILP32F:
case RISCVABI::ABI_LP64F:
EFlags |= ELF::EF_RISCV_FLOAT_ABI_SINGLE;
break;
case RISCVABI::ABI_ILP32D:
case RISCVABI::ABI_LP64D:
EFlags |= ELF::EF_RISCV_FLOAT_ABI_DOUBLE;
break;
case RISCVABI::ABI_ILP32E:
case RISCVABI::ABI_LP64E:
EFlags |= ELF::EF_RISCV_RVE;
break;
case RISCVABI::ABI_Unknown:
llvm_unreachable("Improperly initialised target ABI");
}
MCA.setELFHeaderEFlags(EFlags);
}
void RISCVTargetELFStreamer::reset() {
AttributeSection = nullptr;
}
void RISCVTargetELFStreamer::emitDirectiveVariantCC(MCSymbol &Symbol) {
getStreamer().getAssembler().registerSymbol(Symbol);
cast<MCSymbolELF>(Symbol).setOther(ELF::STO_RISCV_VARIANT_CC);
}
void RISCVELFStreamer::reset() {
static_cast<RISCVTargetStreamer *>(getTargetStreamer())->reset();
MCELFStreamer::reset();
}
namespace llvm {
MCELFStreamer *createRISCVELFStreamer(MCContext &C,
std::unique_ptr<MCAsmBackend> MAB,
std::unique_ptr<MCObjectWriter> MOW,
std::unique_ptr<MCCodeEmitter> MCE,
bool RelaxAll) {
RISCVELFStreamer *S =
new RISCVELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE));
S->getAssembler().setRelaxAll(RelaxAll);
return S;
}
} // namespace llvm
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