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//===- HexagonMCInstLower.cpp - Convert Hexagon MachineInstr to an MCInst -===//
//
// 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 contains code to lower Hexagon MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "Hexagon.h"
#include "HexagonAsmPrinter.h"
#include "MCTargetDesc/HexagonMCExpr.h"
#include "MCTargetDesc/HexagonMCInstrInfo.h"
#include "MCTargetDesc/HexagonMCTargetDesc.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/IR/Constants.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
using namespace llvm;
namespace llvm {
void HexagonLowerToMC(const MCInstrInfo &MCII, const MachineInstr *MI,
MCInst &MCB, HexagonAsmPrinter &AP);
} // end namespace llvm
static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
HexagonAsmPrinter &Printer, bool MustExtend) {
MCContext &MC = Printer.OutContext;
const MCExpr *ME;
// Populate the relocation type based on Hexagon target flags
// set on an operand
MCSymbolRefExpr::VariantKind RelocationType;
switch (MO.getTargetFlags() & ~HexagonII::HMOTF_ConstExtended) {
default:
RelocationType = MCSymbolRefExpr::VK_None;
break;
case HexagonII::MO_PCREL:
RelocationType = MCSymbolRefExpr::VK_PCREL;
break;
case HexagonII::MO_GOT:
RelocationType = MCSymbolRefExpr::VK_GOT;
break;
case HexagonII::MO_LO16:
RelocationType = MCSymbolRefExpr::VK_Hexagon_LO16;
break;
case HexagonII::MO_HI16:
RelocationType = MCSymbolRefExpr::VK_Hexagon_HI16;
break;
case HexagonII::MO_GPREL:
RelocationType = MCSymbolRefExpr::VK_Hexagon_GPREL;
break;
case HexagonII::MO_GDGOT:
RelocationType = MCSymbolRefExpr::VK_Hexagon_GD_GOT;
break;
case HexagonII::MO_GDPLT:
RelocationType = MCSymbolRefExpr::VK_Hexagon_GD_PLT;
break;
case HexagonII::MO_IE:
RelocationType = MCSymbolRefExpr::VK_Hexagon_IE;
break;
case HexagonII::MO_IEGOT:
RelocationType = MCSymbolRefExpr::VK_Hexagon_IE_GOT;
break;
case HexagonII::MO_TPREL:
RelocationType = MCSymbolRefExpr::VK_TPREL;
break;
}
ME = MCSymbolRefExpr::create(Symbol, RelocationType, MC);
if (!MO.isJTI() && MO.getOffset())
ME = MCBinaryExpr::createAdd(ME, MCConstantExpr::create(MO.getOffset(), MC),
MC);
ME = HexagonMCExpr::create(ME, MC);
HexagonMCInstrInfo::setMustExtend(*ME, MustExtend);
return MCOperand::createExpr(ME);
}
// Create an MCInst from a MachineInstr
void llvm::HexagonLowerToMC(const MCInstrInfo &MCII, const MachineInstr *MI,
MCInst &MCB, HexagonAsmPrinter &AP) {
if (MI->getOpcode() == Hexagon::ENDLOOP0) {
HexagonMCInstrInfo::setInnerLoop(MCB);
return;
}
if (MI->getOpcode() == Hexagon::ENDLOOP1) {
HexagonMCInstrInfo::setOuterLoop(MCB);
return;
}
MCInst *MCI = AP.OutContext.createMCInst();
MCI->setOpcode(MI->getOpcode());
assert(MCI->getOpcode() == static_cast<unsigned>(MI->getOpcode()) &&
"MCI opcode should have been set on construction");
for (unsigned i = 0, e = MI->getNumOperands(); i < e; i++) {
const MachineOperand &MO = MI->getOperand(i);
MCOperand MCO;
bool MustExtend = MO.getTargetFlags() & HexagonII::HMOTF_ConstExtended;
switch (MO.getType()) {
default:
MI->print(errs());
llvm_unreachable("unknown operand type");
case MachineOperand::MO_RegisterMask:
continue;
case MachineOperand::MO_Register:
// Ignore all implicit register operands.
if (MO.isImplicit())
continue;
MCO = MCOperand::createReg(MO.getReg());
break;
case MachineOperand::MO_FPImmediate: {
APFloat Val = MO.getFPImm()->getValueAPF();
// FP immediates are used only when setting GPRs, so they may be dealt
// with like regular immediates from this point on.
auto Expr = HexagonMCExpr::create(
MCConstantExpr::create(*Val.bitcastToAPInt().getRawData(),
AP.OutContext),
AP.OutContext);
HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
MCO = MCOperand::createExpr(Expr);
break;
}
case MachineOperand::MO_Immediate: {
auto Expr = HexagonMCExpr::create(
MCConstantExpr::create(MO.getImm(), AP.OutContext), AP.OutContext);
HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
MCO = MCOperand::createExpr(Expr);
break;
}
case MachineOperand::MO_MachineBasicBlock: {
MCExpr const *Expr = MCSymbolRefExpr::create(MO.getMBB()->getSymbol(),
AP.OutContext);
Expr = HexagonMCExpr::create(Expr, AP.OutContext);
HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
MCO = MCOperand::createExpr(Expr);
break;
}
case MachineOperand::MO_GlobalAddress:
MCO = GetSymbolRef(MO, AP.getSymbol(MO.getGlobal()), AP, MustExtend);
break;
case MachineOperand::MO_ExternalSymbol:
MCO = GetSymbolRef(MO, AP.GetExternalSymbolSymbol(MO.getSymbolName()),
AP, MustExtend);
break;
case MachineOperand::MO_JumpTableIndex:
MCO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, MustExtend);
break;
case MachineOperand::MO_ConstantPoolIndex:
MCO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, MustExtend);
break;
case MachineOperand::MO_BlockAddress:
MCO = GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()), AP,
MustExtend);
break;
}
MCI->addOperand(MCO);
}
AP.HexagonProcessInstruction(*MCI, *MI);
HexagonMCInstrInfo::extendIfNeeded(AP.OutContext, MCII, MCB, *MCI);
MCB.addOperand(MCOperand::createInst(MCI));
}
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