MipsMCInstLower.cpp revision f09a03776dbbc882c9b15eeccb8ec847058fbfa0
1//===-- MipsMCInstLower.cpp - Convert Mips MachineInstr to MCInst ---------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file contains code to lower Mips MachineInstrs to their corresponding 11// MCInst records. 12// 13//===----------------------------------------------------------------------===// 14#include "MipsMCInstLower.h" 15#include "MipsAsmPrinter.h" 16#include "MipsInstrInfo.h" 17#include "MCTargetDesc/MipsBaseInfo.h" 18#include "llvm/CodeGen/MachineFunction.h" 19#include "llvm/CodeGen/MachineInstr.h" 20#include "llvm/CodeGen/MachineOperand.h" 21#include "llvm/MC/MCContext.h" 22#include "llvm/MC/MCExpr.h" 23#include "llvm/MC/MCInst.h" 24#include "llvm/Target/Mangler.h" 25 26using namespace llvm; 27 28MipsMCInstLower::MipsMCInstLower(MipsAsmPrinter &asmprinter) 29 : AsmPrinter(asmprinter) {} 30 31void MipsMCInstLower::Initialize(Mangler *M, MCContext *C) { 32 Mang = M; 33 Ctx = C; 34} 35 36MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO, 37 MachineOperandType MOTy, 38 unsigned Offset) const { 39 MCSymbolRefExpr::VariantKind Kind; 40 const MCSymbol *Symbol; 41 42 switch(MO.getTargetFlags()) { 43 default: llvm_unreachable("Invalid target flag!"); 44 case MipsII::MO_NO_FLAG: Kind = MCSymbolRefExpr::VK_None; break; 45 case MipsII::MO_GPREL: Kind = MCSymbolRefExpr::VK_Mips_GPREL; break; 46 case MipsII::MO_GOT_CALL: Kind = MCSymbolRefExpr::VK_Mips_GOT_CALL; break; 47 case MipsII::MO_GOT16: Kind = MCSymbolRefExpr::VK_Mips_GOT16; break; 48 case MipsII::MO_GOT: Kind = MCSymbolRefExpr::VK_Mips_GOT; break; 49 case MipsII::MO_ABS_HI: Kind = MCSymbolRefExpr::VK_Mips_ABS_HI; break; 50 case MipsII::MO_ABS_LO: Kind = MCSymbolRefExpr::VK_Mips_ABS_LO; break; 51 case MipsII::MO_TLSGD: Kind = MCSymbolRefExpr::VK_Mips_TLSGD; break; 52 case MipsII::MO_TLSLDM: Kind = MCSymbolRefExpr::VK_Mips_TLSLDM; break; 53 case MipsII::MO_DTPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_HI; break; 54 case MipsII::MO_DTPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_LO; break; 55 case MipsII::MO_GOTTPREL: Kind = MCSymbolRefExpr::VK_Mips_GOTTPREL; break; 56 case MipsII::MO_TPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_TPREL_HI; break; 57 case MipsII::MO_TPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_TPREL_LO; break; 58 case MipsII::MO_GPOFF_HI: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_HI; break; 59 case MipsII::MO_GPOFF_LO: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_LO; break; 60 case MipsII::MO_GOT_DISP: Kind = MCSymbolRefExpr::VK_Mips_GOT_DISP; break; 61 case MipsII::MO_GOT_PAGE: Kind = MCSymbolRefExpr::VK_Mips_GOT_PAGE; break; 62 case MipsII::MO_GOT_OFST: Kind = MCSymbolRefExpr::VK_Mips_GOT_OFST; break; 63 case MipsII::MO_HIGHER: Kind = MCSymbolRefExpr::VK_Mips_HIGHER; break; 64 case MipsII::MO_HIGHEST: Kind = MCSymbolRefExpr::VK_Mips_HIGHEST; break; 65 case MipsII::MO_GOT_HI16: Kind = MCSymbolRefExpr::VK_Mips_GOT_HI16; break; 66 case MipsII::MO_GOT_LO16: Kind = MCSymbolRefExpr::VK_Mips_GOT_LO16; break; 67 case MipsII::MO_CALL_HI16: Kind = MCSymbolRefExpr::VK_Mips_CALL_HI16; break; 68 case MipsII::MO_CALL_LO16: Kind = MCSymbolRefExpr::VK_Mips_CALL_LO16; break; 69 } 70 71 switch (MOTy) { 72 case MachineOperand::MO_MachineBasicBlock: 73 Symbol = MO.getMBB()->getSymbol(); 74 break; 75 76 case MachineOperand::MO_GlobalAddress: 77 Symbol = Mang->getSymbol(MO.getGlobal()); 78 Offset += MO.getOffset(); 79 break; 80 81 case MachineOperand::MO_BlockAddress: 82 Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress()); 83 Offset += MO.getOffset(); 84 break; 85 86 case MachineOperand::MO_ExternalSymbol: 87 Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName()); 88 Offset += MO.getOffset(); 89 break; 90 91 case MachineOperand::MO_JumpTableIndex: 92 Symbol = AsmPrinter.GetJTISymbol(MO.getIndex()); 93 break; 94 95 case MachineOperand::MO_ConstantPoolIndex: 96 Symbol = AsmPrinter.GetCPISymbol(MO.getIndex()); 97 Offset += MO.getOffset(); 98 break; 99 100 default: 101 llvm_unreachable("<unknown operand type>"); 102 } 103 104 const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::Create(Symbol, Kind, *Ctx); 105 106 if (!Offset) 107 return MCOperand::CreateExpr(MCSym); 108 109 // Assume offset is never negative. 110 assert(Offset > 0); 111 112 const MCConstantExpr *OffsetExpr = MCConstantExpr::Create(Offset, *Ctx); 113 const MCBinaryExpr *Add = MCBinaryExpr::CreateAdd(MCSym, OffsetExpr, *Ctx); 114 return MCOperand::CreateExpr(Add); 115} 116 117/* 118static void CreateMCInst(MCInst& Inst, unsigned Opc, const MCOperand &Opnd0, 119 const MCOperand &Opnd1, 120 const MCOperand &Opnd2 = MCOperand()) { 121 Inst.setOpcode(Opc); 122 Inst.addOperand(Opnd0); 123 Inst.addOperand(Opnd1); 124 if (Opnd2.isValid()) 125 Inst.addOperand(Opnd2); 126} 127*/ 128 129MCOperand MipsMCInstLower::LowerOperand(const MachineOperand &MO, 130 unsigned offset) const { 131 MachineOperandType MOTy = MO.getType(); 132 133 switch (MOTy) { 134 default: llvm_unreachable("unknown operand type"); 135 case MachineOperand::MO_Register: 136 // Ignore all implicit register operands. 137 if (MO.isImplicit()) break; 138 return MCOperand::CreateReg(MO.getReg()); 139 case MachineOperand::MO_Immediate: 140 return MCOperand::CreateImm(MO.getImm() + offset); 141 case MachineOperand::MO_MachineBasicBlock: 142 case MachineOperand::MO_GlobalAddress: 143 case MachineOperand::MO_ExternalSymbol: 144 case MachineOperand::MO_JumpTableIndex: 145 case MachineOperand::MO_ConstantPoolIndex: 146 case MachineOperand::MO_BlockAddress: 147 return LowerSymbolOperand(MO, MOTy, offset); 148 case MachineOperand::MO_RegisterMask: 149 break; 150 } 151 152 return MCOperand(); 153} 154 155void MipsMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const { 156 OutMI.setOpcode(MI->getOpcode()); 157 158 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 159 const MachineOperand &MO = MI->getOperand(i); 160 MCOperand MCOp = LowerOperand(MO); 161 162 if (MCOp.isValid()) 163 OutMI.addOperand(MCOp); 164 } 165} 166 167