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//=- LoongArchMCInstLower.cpp - Convert LoongArch 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 LoongArch MachineInstrs to their
// corresponding MCInst records.
//
//===----------------------------------------------------------------------===//
#include "LoongArch.h"
#include "LoongArchSubtarget.h"
#include "MCTargetDesc/LoongArchBaseInfo.h"
#include "MCTargetDesc/LoongArchMCExpr.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
static MCOperand lowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym,
const AsmPrinter &AP) {
MCContext &Ctx = AP.OutContext;
LoongArchMCExpr::VariantKind Kind;
switch (MO.getTargetFlags()) {
default:
llvm_unreachable("Unknown target flag on GV operand");
case LoongArchII::MO_None:
Kind = LoongArchMCExpr::VK_LoongArch_None;
break;
case LoongArchII::MO_CALL:
Kind = LoongArchMCExpr::VK_LoongArch_CALL;
break;
case LoongArchII::MO_CALL_PLT:
Kind = LoongArchMCExpr::VK_LoongArch_CALL_PLT;
break;
case LoongArchII::MO_PCREL_HI:
Kind = LoongArchMCExpr::VK_LoongArch_PCALA_HI20;
break;
case LoongArchII::MO_PCREL_LO:
Kind = LoongArchMCExpr::VK_LoongArch_PCALA_LO12;
break;
case LoongArchII::MO_GOT_PC_HI:
Kind = LoongArchMCExpr::VK_LoongArch_GOT_PC_HI20;
break;
case LoongArchII::MO_GOT_PC_LO:
Kind = LoongArchMCExpr::VK_LoongArch_GOT_PC_LO12;
break;
case LoongArchII::MO_LE_HI:
Kind = LoongArchMCExpr::VK_LoongArch_TLS_LE_HI20;
break;
case LoongArchII::MO_LE_LO:
Kind = LoongArchMCExpr::VK_LoongArch_TLS_LE_LO12;
break;
case LoongArchII::MO_IE_PC_HI:
Kind = LoongArchMCExpr::VK_LoongArch_TLS_IE_PC_HI20;
break;
case LoongArchII::MO_IE_PC_LO:
Kind = LoongArchMCExpr::VK_LoongArch_TLS_IE_PC_LO12;
break;
case LoongArchII::MO_LD_PC_HI:
Kind = LoongArchMCExpr::VK_LoongArch_TLS_LD_PC_HI20;
break;
case LoongArchII::MO_GD_PC_HI:
Kind = LoongArchMCExpr::VK_LoongArch_TLS_GD_PC_HI20;
break;
// TODO: Handle more target-flags.
}
const MCExpr *ME =
MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, Ctx);
if (!MO.isJTI() && !MO.isMBB() && MO.getOffset())
ME = MCBinaryExpr::createAdd(
ME, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
if (Kind != LoongArchMCExpr::VK_LoongArch_None)
ME = LoongArchMCExpr::create(ME, Kind, Ctx);
return MCOperand::createExpr(ME);
}
bool llvm::lowerLoongArchMachineOperandToMCOperand(const MachineOperand &MO,
MCOperand &MCOp,
const AsmPrinter &AP) {
switch (MO.getType()) {
default:
report_fatal_error(
"lowerLoongArchMachineOperandToMCOperand: unknown operand type");
case MachineOperand::MO_Register:
// Ignore all implicit register operands.
if (MO.isImplicit())
return false;
MCOp = MCOperand::createReg(MO.getReg());
break;
case MachineOperand::MO_RegisterMask:
// Regmasks are like implicit defs.
return false;
case MachineOperand::MO_Immediate:
MCOp = MCOperand::createImm(MO.getImm());
break;
case MachineOperand::MO_ConstantPoolIndex:
MCOp = lowerSymbolOperand(MO, AP.GetCPISymbol(MO.getIndex()), AP);
break;
case MachineOperand::MO_GlobalAddress:
MCOp = lowerSymbolOperand(MO, AP.getSymbolPreferLocal(*MO.getGlobal()), AP);
break;
case MachineOperand::MO_MachineBasicBlock:
MCOp = lowerSymbolOperand(MO, MO.getMBB()->getSymbol(), AP);
break;
case MachineOperand::MO_ExternalSymbol:
MCOp = lowerSymbolOperand(
MO, AP.GetExternalSymbolSymbol(MO.getSymbolName()), AP);
break;
case MachineOperand::MO_BlockAddress:
MCOp = lowerSymbolOperand(
MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()), AP);
break;
case MachineOperand::MO_JumpTableIndex:
MCOp = lowerSymbolOperand(MO, AP.GetJTISymbol(MO.getIndex()), AP);
break;
}
return true;
}
bool llvm::lowerLoongArchMachineInstrToMCInst(const MachineInstr *MI,
MCInst &OutMI, AsmPrinter &AP) {
OutMI.setOpcode(MI->getOpcode());
for (const MachineOperand &MO : MI->operands()) {
MCOperand MCOp;
if (lowerLoongArchMachineOperandToMCOperand(MO, MCOp, AP))
OutMI.addOperand(MCOp);
}
return false;
}
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