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 "MCTargetDesc/MipsBaseInfo.h"
16 #include "MipsAsmPrinter.h"
17 #include "MipsInstrInfo.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
26 using namespace llvm;
27
MipsMCInstLower(MipsAsmPrinter & asmprinter)28 MipsMCInstLower::MipsMCInstLower(MipsAsmPrinter &asmprinter)
29 : AsmPrinter(asmprinter) {}
30
Initialize(Mangler * M,MCContext * C)31 void MipsMCInstLower::Initialize(Mangler *M, MCContext *C) {
32 Mang = M;
33 Ctx = C;
34 }
35
LowerSymbolOperand(const MachineOperand & MO,MachineOperandType MOTy,unsigned Offset) const36 MCOperand 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 /*
118 static 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
LowerOperand(const MachineOperand & MO,unsigned offset) const129 MCOperand 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
Lower(const MachineInstr * MI,MCInst & OutMI) const155 void 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