1 //===-- XCoreMCInstLower.cpp - Convert XCore MachineInstr to 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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 /// 9 /// \file 10 /// This file contains code to lower XCore MachineInstrs to their 11 /// corresponding MCInst records. 12 /// 13 //===----------------------------------------------------------------------===// 14 #include "XCoreMCInstLower.h" 15 #include "llvm/CodeGen/AsmPrinter.h" 16 #include "llvm/CodeGen/MachineFunction.h" 17 #include "llvm/CodeGen/MachineInstr.h" 18 #include "llvm/CodeGen/MachineOperand.h" 19 #include "llvm/IR/Mangler.h" 20 #include "llvm/MC/MCContext.h" 21 #include "llvm/MC/MCExpr.h" 22 #include "llvm/MC/MCInst.h" 23 24 using namespace llvm; 25 26 XCoreMCInstLower::XCoreMCInstLower(class AsmPrinter &asmprinter) 27 : Printer(asmprinter) {} 28 29 void XCoreMCInstLower::Initialize(MCContext *C) { Ctx = C; } 30 31 MCOperand XCoreMCInstLower::LowerSymbolOperand(const MachineOperand &MO, 32 MachineOperandType MOTy, 33 unsigned Offset) const { 34 MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None; 35 const MCSymbol *Symbol; 36 37 switch (MOTy) { 38 case MachineOperand::MO_MachineBasicBlock: 39 Symbol = MO.getMBB()->getSymbol(); 40 break; 41 case MachineOperand::MO_GlobalAddress: 42 Symbol = Printer.getSymbol(MO.getGlobal()); 43 Offset += MO.getOffset(); 44 break; 45 case MachineOperand::MO_BlockAddress: 46 Symbol = Printer.GetBlockAddressSymbol(MO.getBlockAddress()); 47 Offset += MO.getOffset(); 48 break; 49 case MachineOperand::MO_ExternalSymbol: 50 Symbol = Printer.GetExternalSymbolSymbol(MO.getSymbolName()); 51 Offset += MO.getOffset(); 52 break; 53 case MachineOperand::MO_JumpTableIndex: 54 Symbol = Printer.GetJTISymbol(MO.getIndex()); 55 break; 56 case MachineOperand::MO_ConstantPoolIndex: 57 Symbol = Printer.GetCPISymbol(MO.getIndex()); 58 Offset += MO.getOffset(); 59 break; 60 default: 61 llvm_unreachable("<unknown operand type>"); 62 } 63 64 const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::create(Symbol, Kind, *Ctx); 65 66 if (!Offset) 67 return MCOperand::createExpr(MCSym); 68 69 // Assume offset is never negative. 70 assert(Offset > 0); 71 72 const MCConstantExpr *OffsetExpr = MCConstantExpr::create(Offset, *Ctx); 73 const MCBinaryExpr *Add = MCBinaryExpr::createAdd(MCSym, OffsetExpr, *Ctx); 74 return MCOperand::createExpr(Add); 75 } 76 77 MCOperand XCoreMCInstLower::LowerOperand(const MachineOperand &MO, 78 unsigned offset) const { 79 MachineOperandType MOTy = MO.getType(); 80 81 switch (MOTy) { 82 default: llvm_unreachable("unknown operand type"); 83 case MachineOperand::MO_Register: 84 // Ignore all implicit register operands. 85 if (MO.isImplicit()) break; 86 return MCOperand::createReg(MO.getReg()); 87 case MachineOperand::MO_Immediate: 88 return MCOperand::createImm(MO.getImm() + offset); 89 case MachineOperand::MO_MachineBasicBlock: 90 case MachineOperand::MO_GlobalAddress: 91 case MachineOperand::MO_ExternalSymbol: 92 case MachineOperand::MO_JumpTableIndex: 93 case MachineOperand::MO_ConstantPoolIndex: 94 case MachineOperand::MO_BlockAddress: 95 return LowerSymbolOperand(MO, MOTy, offset); 96 case MachineOperand::MO_RegisterMask: 97 break; 98 } 99 100 return MCOperand(); 101 } 102 103 void XCoreMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const { 104 OutMI.setOpcode(MI->getOpcode()); 105 106 for (const MachineOperand &MO : MI->operands()) { 107 MCOperand MCOp = LowerOperand(MO); 108 109 if (MCOp.isValid()) 110 OutMI.addOperand(MCOp); 111 } 112 } 113