114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
//===- ARCMCInstLower.cpp - ARC MachineInstr to MCInst ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file contains code to lower ARC MachineInstrs to their
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/// corresponding MCInst records.
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///
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//===----------------------------------------------------------------------===//
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#include "ARCMCInstLower.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineOperand.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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using namespace llvm;
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ARCMCInstLower::ARCMCInstLower(MCContext *C, AsmPrinter &AsmPrinter)
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: Ctx(C), Printer(AsmPrinter) {}
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MCOperand ARCMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
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MachineOperandType MOTy,
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unsigned Offset) const {
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MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
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const MCSymbol *Symbol;
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switch (MOTy) {
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case MachineOperand::MO_MachineBasicBlock:
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Symbol = MO.getMBB()->getSymbol();
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break;
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case MachineOperand::MO_GlobalAddress:
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Symbol = Printer.getSymbol(MO.getGlobal());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_BlockAddress:
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Symbol = Printer.GetBlockAddressSymbol(MO.getBlockAddress());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_ExternalSymbol:
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Symbol = Printer.GetExternalSymbolSymbol(MO.getSymbolName());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_JumpTableIndex:
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Symbol = Printer.GetJTISymbol(MO.getIndex());
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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Symbol = Printer.GetCPISymbol(MO.getIndex());
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Offset += MO.getOffset();
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break;
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default:
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llvm_unreachable("<unknown operand type>");
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}
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assert(Symbol && "Symbol creation failed.\n");
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const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::create(Symbol, Kind, *Ctx);
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if (!Offset)
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return MCOperand::createExpr(MCSym);
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// Assume offset is never negative.
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assert(Offset > 0);
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const MCConstantExpr *OffsetExpr = MCConstantExpr::create(Offset, *Ctx);
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const MCBinaryExpr *Add = MCBinaryExpr::createAdd(MCSym, OffsetExpr, *Ctx);
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return MCOperand::createExpr(Add);
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}
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MCOperand ARCMCInstLower::LowerOperand(const MachineOperand &MO,
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unsigned Offset) const {
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MachineOperandType MOTy = MO.getType();
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switch (MOTy) {
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default:
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llvm_unreachable("unknown operand type");
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case MachineOperand::MO_Register:
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// Ignore all implicit register operands.
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if (MO.isImplicit())
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break;
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return MCOperand::createReg(MO.getReg());
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case MachineOperand::MO_Immediate:
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return MCOperand::createImm(MO.getImm() + Offset);
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case MachineOperand::MO_MachineBasicBlock:
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ExternalSymbol:
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case MachineOperand::MO_JumpTableIndex:
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case MachineOperand::MO_ConstantPoolIndex:
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case MachineOperand::MO_BlockAddress:
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return LowerSymbolOperand(MO, MOTy, Offset);
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case MachineOperand::MO_RegisterMask:
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break;
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}
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return {};
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}
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void ARCMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
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OutMI.setOpcode(MI->getOpcode());
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for (const MachineOperand &MO : MI->operands()) {
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MCOperand MCOp = LowerOperand(MO);
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if (MCOp.isValid())
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OutMI.addOperand(MCOp);
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}
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}
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