1 //===-- MipsMCInstLower.cpp - Convert Mips MachineInstr to MCInst ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains code to lower Mips MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
15 #include "MipsMCInstLower.h"
16 #include "MipsAsmPrinter.h"
17 #include "MipsInstrInfo.h"
18 #include "MCTargetDesc/MipsBaseInfo.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstr.h"
21 #include "llvm/CodeGen/MachineOperand.h"
22 #include "llvm/MC/MCContext.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCInst.h"
25 #include "llvm/Target/Mangler.h"
29 MipsMCInstLower::MipsMCInstLower(MipsAsmPrinter &asmprinter)
30 : AsmPrinter(asmprinter) {}
32 void MipsMCInstLower::Initialize(Mangler *M, MCContext *C) {
37 MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
38 MachineOperandType MOTy,
39 unsigned Offset) const {
40 MCSymbolRefExpr::VariantKind Kind;
41 const MCSymbol *Symbol;
43 switch(MO.getTargetFlags()) {
44 default: llvm_unreachable("Invalid target flag!");
45 case MipsII::MO_NO_FLAG: Kind = MCSymbolRefExpr::VK_None; break;
46 case MipsII::MO_GPREL: Kind = MCSymbolRefExpr::VK_Mips_GPREL; break;
47 case MipsII::MO_GOT_CALL: Kind = MCSymbolRefExpr::VK_Mips_GOT_CALL; break;
48 case MipsII::MO_GOT16: Kind = MCSymbolRefExpr::VK_Mips_GOT16; break;
49 case MipsII::MO_GOT: Kind = MCSymbolRefExpr::VK_Mips_GOT; break;
50 case MipsII::MO_ABS_HI: Kind = MCSymbolRefExpr::VK_Mips_ABS_HI; break;
51 case MipsII::MO_ABS_LO: Kind = MCSymbolRefExpr::VK_Mips_ABS_LO; break;
52 case MipsII::MO_TLSGD: Kind = MCSymbolRefExpr::VK_Mips_TLSGD; break;
53 case MipsII::MO_TLSLDM: Kind = MCSymbolRefExpr::VK_Mips_TLSLDM; break;
54 case MipsII::MO_DTPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_HI; break;
55 case MipsII::MO_DTPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_DTPREL_LO; break;
56 case MipsII::MO_GOTTPREL: Kind = MCSymbolRefExpr::VK_Mips_GOTTPREL; break;
57 case MipsII::MO_TPREL_HI: Kind = MCSymbolRefExpr::VK_Mips_TPREL_HI; break;
58 case MipsII::MO_TPREL_LO: Kind = MCSymbolRefExpr::VK_Mips_TPREL_LO; break;
59 case MipsII::MO_GPOFF_HI: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_HI; break;
60 case MipsII::MO_GPOFF_LO: Kind = MCSymbolRefExpr::VK_Mips_GPOFF_LO; break;
61 case MipsII::MO_GOT_DISP: Kind = MCSymbolRefExpr::VK_Mips_GOT_DISP; break;
62 case MipsII::MO_GOT_PAGE: Kind = MCSymbolRefExpr::VK_Mips_GOT_PAGE; break;
63 case MipsII::MO_GOT_OFST: Kind = MCSymbolRefExpr::VK_Mips_GOT_OFST; break;
64 case MipsII::MO_HIGHER: Kind = MCSymbolRefExpr::VK_Mips_HIGHER; break;
65 case MipsII::MO_HIGHEST: Kind = MCSymbolRefExpr::VK_Mips_HIGHEST; break;
69 case MachineOperand::MO_MachineBasicBlock:
70 Symbol = MO.getMBB()->getSymbol();
73 case MachineOperand::MO_GlobalAddress:
74 Symbol = Mang->getSymbol(MO.getGlobal());
75 Offset += MO.getOffset();
78 case MachineOperand::MO_BlockAddress:
79 Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
80 Offset += MO.getOffset();
83 case MachineOperand::MO_ExternalSymbol:
84 Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
85 Offset += MO.getOffset();
88 case MachineOperand::MO_JumpTableIndex:
89 Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
92 case MachineOperand::MO_ConstantPoolIndex:
93 Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
94 Offset += MO.getOffset();
98 llvm_unreachable("<unknown operand type>");
101 const MCSymbolRefExpr *MCSym = MCSymbolRefExpr::Create(Symbol, Kind, *Ctx);
104 return MCOperand::CreateExpr(MCSym);
106 // Assume offset is never negative.
109 const MCConstantExpr *OffsetExpr = MCConstantExpr::Create(Offset, *Ctx);
110 const MCBinaryExpr *Add = MCBinaryExpr::CreateAdd(MCSym, OffsetExpr, *Ctx);
111 return MCOperand::CreateExpr(Add);
115 static void CreateMCInst(MCInst& Inst, unsigned Opc, const MCOperand &Opnd0,
116 const MCOperand &Opnd1,
117 const MCOperand &Opnd2 = MCOperand()) {
119 Inst.addOperand(Opnd0);
120 Inst.addOperand(Opnd1);
122 Inst.addOperand(Opnd2);
126 MCOperand MipsMCInstLower::LowerOperand(const MachineOperand &MO,
127 unsigned offset) const {
128 MachineOperandType MOTy = MO.getType();
131 default: llvm_unreachable("unknown operand type");
132 case MachineOperand::MO_Register:
133 // Ignore all implicit register operands.
134 if (MO.isImplicit()) break;
135 return MCOperand::CreateReg(MO.getReg());
136 case MachineOperand::MO_Immediate:
137 return MCOperand::CreateImm(MO.getImm() + offset);
138 case MachineOperand::MO_MachineBasicBlock:
139 case MachineOperand::MO_GlobalAddress:
140 case MachineOperand::MO_ExternalSymbol:
141 case MachineOperand::MO_JumpTableIndex:
142 case MachineOperand::MO_ConstantPoolIndex:
143 case MachineOperand::MO_BlockAddress:
144 return LowerSymbolOperand(MO, MOTy, offset);
145 case MachineOperand::MO_RegisterMask:
152 void MipsMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
153 OutMI.setOpcode(MI->getOpcode());
155 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
156 const MachineOperand &MO = MI->getOperand(i);
157 MCOperand MCOp = LowerOperand(MO);
160 OutMI.addOperand(MCOp);
164 // If the D<shift> instruction has a shift amount that is greater
165 // than 31 (checked in calling routine), lower it to a D<shift>32 instruction
166 void MipsMCInstLower::LowerLargeShift(const MachineInstr *MI,
170 Inst.addOperand(LowerOperand(MI->getOperand(0)));
172 Inst.addOperand(LowerOperand(MI->getOperand(1)));
174 Inst.addOperand(MCOperand::CreateImm(Shift));
176 switch (MI->getOpcode()) {
178 // Calling function is not synchronized
179 llvm_unreachable("Unexpected shift instruction");
182 Inst.setOpcode(Mips::DSLL32);
185 Inst.setOpcode(Mips::DSRL32);
188 Inst.setOpcode(Mips::DSRA32);