134 lines · cpp
1//=-- LanaiMCInstLower.cpp - Convert Lanai MachineInstr to an MCInst --------=//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// This file contains code to lower Lanai MachineInstrs to their corresponding10// MCInst records.11//12//===----------------------------------------------------------------------===//13 14#include "LanaiMCInstLower.h"15 16#include "MCTargetDesc/LanaiBaseInfo.h"17#include "MCTargetDesc/LanaiMCAsmInfo.h"18#include "llvm/ADT/SmallString.h"19#include "llvm/CodeGen/AsmPrinter.h"20#include "llvm/CodeGen/MachineBasicBlock.h"21#include "llvm/CodeGen/MachineInstr.h"22#include "llvm/MC/MCAsmInfo.h"23#include "llvm/MC/MCContext.h"24#include "llvm/MC/MCExpr.h"25#include "llvm/MC/MCInst.h"26#include "llvm/Support/ErrorHandling.h"27#include "llvm/Support/raw_ostream.h"28 29using namespace llvm;30 31MCSymbol *32LanaiMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {33 return Printer.getSymbol(MO.getGlobal());34}35 36MCSymbol *37LanaiMCInstLower::GetBlockAddressSymbol(const MachineOperand &MO) const {38 return Printer.GetBlockAddressSymbol(MO.getBlockAddress());39}40 41MCSymbol *42LanaiMCInstLower::GetExternalSymbolSymbol(const MachineOperand &MO) const {43 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());44}45 46MCSymbol *LanaiMCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {47 SmallString<256> Name;48 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"49 << Printer.getFunctionNumber() << '_'50 << MO.getIndex();51 // Create a symbol for the name.52 return Ctx.getOrCreateSymbol(Name.str());53}54 55MCSymbol *56LanaiMCInstLower::GetConstantPoolIndexSymbol(const MachineOperand &MO) const {57 SmallString<256> Name;58 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"59 << Printer.getFunctionNumber() << '_'60 << MO.getIndex();61 // Create a symbol for the name.62 return Ctx.getOrCreateSymbol(Name.str());63}64 65MCOperand LanaiMCInstLower::LowerSymbolOperand(const MachineOperand &MO,66 MCSymbol *Sym) const {67 Lanai::Specifier Kind;68 switch (MO.getTargetFlags()) {69 case LanaiII::MO_NO_FLAG:70 Kind = Lanai::S_None;71 break;72 case LanaiII::MO_ABS_HI:73 Kind = Lanai::S_ABS_HI;74 break;75 case LanaiII::MO_ABS_LO:76 Kind = Lanai::S_ABS_LO;77 break;78 default:79 llvm_unreachable("Unknown target flag on GV operand");80 }81 82 const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);83 if (!MO.isJTI() && MO.getOffset())84 Expr = MCBinaryExpr::createAdd(85 Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);86 Expr = MCSpecifierExpr::create(Expr, Kind, Ctx);87 return MCOperand::createExpr(Expr);88}89 90void LanaiMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {91 OutMI.setOpcode(MI->getOpcode());92 93 for (const MachineOperand &MO : MI->operands()) {94 MCOperand MCOp;95 switch (MO.getType()) {96 case MachineOperand::MO_Register:97 // Ignore all implicit register operands.98 if (MO.isImplicit())99 continue;100 MCOp = MCOperand::createReg(MO.getReg());101 break;102 case MachineOperand::MO_Immediate:103 MCOp = MCOperand::createImm(MO.getImm());104 break;105 case MachineOperand::MO_MachineBasicBlock:106 MCOp = MCOperand::createExpr(107 MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));108 break;109 case MachineOperand::MO_RegisterMask:110 continue;111 case MachineOperand::MO_GlobalAddress:112 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));113 break;114 case MachineOperand::MO_BlockAddress:115 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));116 break;117 case MachineOperand::MO_ExternalSymbol:118 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));119 break;120 case MachineOperand::MO_JumpTableIndex:121 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));122 break;123 case MachineOperand::MO_ConstantPoolIndex:124 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));125 break;126 default:127 MI->print(errs());128 llvm_unreachable("unknown operand type");129 }130 131 OutMI.addOperand(MCOp);132 }133}134