158 lines · cpp
1//===-- MSP430MCInstLower.cpp - Convert MSP430 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 MSP430 MachineInstrs to their corresponding10// MCInst records.11//12//===----------------------------------------------------------------------===//13 14#include "MSP430MCInstLower.h"15#include "llvm/ADT/SmallString.h"16#include "llvm/CodeGen/AsmPrinter.h"17#include "llvm/CodeGen/MachineBasicBlock.h"18#include "llvm/CodeGen/MachineInstr.h"19#include "llvm/IR/DataLayout.h"20#include "llvm/IR/Mangler.h"21#include "llvm/MC/MCAsmInfo.h"22#include "llvm/MC/MCContext.h"23#include "llvm/MC/MCExpr.h"24#include "llvm/MC/MCInst.h"25#include "llvm/Support/ErrorHandling.h"26#include "llvm/Support/raw_ostream.h"27#include "llvm/Target/TargetMachine.h"28using namespace llvm;29 30MCSymbol *MSP430MCInstLower::31GetGlobalAddressSymbol(const MachineOperand &MO) const {32 switch (MO.getTargetFlags()) {33 default: llvm_unreachable("Unknown target flag on GV operand");34 case 0: break;35 }36 37 return Printer.getSymbol(MO.getGlobal());38}39 40MCSymbol *MSP430MCInstLower::41GetExternalSymbolSymbol(const MachineOperand &MO) const {42 switch (MO.getTargetFlags()) {43 default: llvm_unreachable("Unknown target flag on GV operand");44 case 0: break;45 }46 47 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());48}49 50MCSymbol *MSP430MCInstLower::51GetJumpTableSymbol(const MachineOperand &MO) const {52 const DataLayout &DL = Printer.getDataLayout();53 SmallString<256> Name;54 raw_svector_ostream(Name) << DL.getPrivateGlobalPrefix() << "JTI"55 << Printer.getFunctionNumber() << '_'56 << MO.getIndex();57 58 switch (MO.getTargetFlags()) {59 default: llvm_unreachable("Unknown target flag on GV operand");60 case 0: break;61 }62 63 // Create a symbol for the name.64 return Ctx.getOrCreateSymbol(Name);65}66 67MCSymbol *MSP430MCInstLower::68GetConstantPoolIndexSymbol(const MachineOperand &MO) const {69 const DataLayout &DL = Printer.getDataLayout();70 SmallString<256> Name;71 raw_svector_ostream(Name) << DL.getPrivateGlobalPrefix() << "CPI"72 << Printer.getFunctionNumber() << '_'73 << MO.getIndex();74 75 switch (MO.getTargetFlags()) {76 default: llvm_unreachable("Unknown target flag on GV operand");77 case 0: break;78 }79 80 // Create a symbol for the name.81 return Ctx.getOrCreateSymbol(Name);82}83 84MCSymbol *MSP430MCInstLower::85GetBlockAddressSymbol(const MachineOperand &MO) const {86 switch (MO.getTargetFlags()) {87 default: llvm_unreachable("Unknown target flag on GV operand");88 case 0: break;89 }90 91 return Printer.GetBlockAddressSymbol(MO.getBlockAddress());92}93 94MCOperand MSP430MCInstLower::95LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {96 // FIXME: We would like an efficient form for this, so we don't have to do a97 // lot of extra uniquing.98 const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);99 100 switch (MO.getTargetFlags()) {101 default: llvm_unreachable("Unknown target flag on GV operand");102 case 0: break;103 }104 105 if (!MO.isJTI() && MO.getOffset())106 Expr = MCBinaryExpr::createAdd(Expr,107 MCConstantExpr::create(MO.getOffset(), Ctx),108 Ctx);109 return MCOperand::createExpr(Expr);110}111 112#define GET_REGINFO_ENUM113#include "MSP430GenRegisterInfo.inc"114 115void MSP430MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {116 OutMI.setOpcode(MI->getOpcode());117 118 for (const MachineOperand &MO : MI->operands()) {119 MCOperand MCOp;120 switch (MO.getType()) {121 default:122 MI->print(errs());123 llvm_unreachable("unknown operand type");124 case MachineOperand::MO_Register:125 // Ignore all implicit register operands.126 if (MO.isImplicit()) continue;127 MCOp = MCOperand::createReg(MO.getReg());128 break;129 case MachineOperand::MO_Immediate:130 MCOp = MCOperand::createImm(MO.getImm());131 break;132 case MachineOperand::MO_MachineBasicBlock:133 MCOp = MCOperand::createExpr(MCSymbolRefExpr::create(134 MO.getMBB()->getSymbol(), Ctx));135 break;136 case MachineOperand::MO_GlobalAddress:137 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));138 break;139 case MachineOperand::MO_ExternalSymbol:140 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));141 break;142 case MachineOperand::MO_JumpTableIndex:143 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));144 break;145 case MachineOperand::MO_ConstantPoolIndex:146 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));147 break;148 case MachineOperand::MO_BlockAddress:149 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));150 break;151 case MachineOperand::MO_RegisterMask:152 continue;153 }154 155 OutMI.addOperand(MCOp);156 }157}158