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
15 #include "MipsMCInstLower.h"
16 #include "MipsAsmPrinter.h"
17 #include "MipsInstrInfo.h"
18 #include "MipsMCSymbolRefExpr.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/MCInst.h"
24 #include "llvm/Target/Mangler.h"
25 using namespace llvm;
26
MipsMCInstLower(Mangler * mang,const MachineFunction & mf,MipsAsmPrinter & asmprinter)27 MipsMCInstLower::MipsMCInstLower(Mangler *mang, const MachineFunction &mf,
28 MipsAsmPrinter &asmprinter)
29 : Ctx(mf.getContext()), Mang(mang), AsmPrinter(asmprinter) {}
30
LowerSymbolOperand(const MachineOperand & MO,MachineOperandType MOTy,unsigned Offset) const31 MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
32 MachineOperandType MOTy,
33 unsigned Offset) const {
34 MipsMCSymbolRefExpr::VariantKind Kind;
35 const MCSymbol *Symbol;
36
37 switch(MO.getTargetFlags()) {
38 default: assert(0 && "Invalid target flag!");
39 case MipsII::MO_NO_FLAG: Kind = MipsMCSymbolRefExpr::VK_Mips_None; break;
40 case MipsII::MO_GPREL: Kind = MipsMCSymbolRefExpr::VK_Mips_GPREL; break;
41 case MipsII::MO_GOT_CALL: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT_CALL; break;
42 case MipsII::MO_GOT: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT; break;
43 case MipsII::MO_ABS_HI: Kind = MipsMCSymbolRefExpr::VK_Mips_ABS_HI; break;
44 case MipsII::MO_ABS_LO: Kind = MipsMCSymbolRefExpr::VK_Mips_ABS_LO; break;
45 case MipsII::MO_TLSGD: Kind = MipsMCSymbolRefExpr::VK_Mips_TLSGD; break;
46 case MipsII::MO_GOTTPREL: Kind = MipsMCSymbolRefExpr::VK_Mips_GOTTPREL; break;
47 case MipsII::MO_TPREL_HI: Kind = MipsMCSymbolRefExpr::VK_Mips_TPREL_HI; break;
48 case MipsII::MO_TPREL_LO: Kind = MipsMCSymbolRefExpr::VK_Mips_TPREL_LO; break;
49 case MipsII::MO_GPOFF_HI: Kind = MipsMCSymbolRefExpr::VK_Mips_GPOFF_HI; break;
50 case MipsII::MO_GPOFF_LO: Kind = MipsMCSymbolRefExpr::VK_Mips_GPOFF_LO; break;
51 case MipsII::MO_GOT_DISP: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT_DISP; break;
52 case MipsII::MO_GOT_PAGE: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT_PAGE; break;
53 case MipsII::MO_GOT_OFST: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT_OFST; break;
54 }
55
56 switch (MOTy) {
57 case MachineOperand::MO_MachineBasicBlock:
58 Symbol = MO.getMBB()->getSymbol();
59 break;
60
61 case MachineOperand::MO_GlobalAddress:
62 Symbol = Mang->getSymbol(MO.getGlobal());
63 break;
64
65 case MachineOperand::MO_BlockAddress:
66 Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
67 break;
68
69 case MachineOperand::MO_ExternalSymbol:
70 Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
71 break;
72
73 case MachineOperand::MO_JumpTableIndex:
74 Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
75 break;
76
77 case MachineOperand::MO_ConstantPoolIndex:
78 Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
79 if (MO.getOffset())
80 Offset += MO.getOffset();
81 break;
82
83 default:
84 llvm_unreachable("<unknown operand type>");
85 }
86
87 return MCOperand::CreateExpr(MipsMCSymbolRefExpr::Create(Kind, Symbol, Offset,
88 Ctx));
89 }
90
LowerOperand(const MachineOperand & MO) const91 MCOperand MipsMCInstLower::LowerOperand(const MachineOperand& MO) const {
92 MachineOperandType MOTy = MO.getType();
93
94 switch (MOTy) {
95 default:
96 assert(0 && "unknown operand type");
97 break;
98 case MachineOperand::MO_Register:
99 // Ignore all implicit register operands.
100 if (MO.isImplicit()) break;
101 return MCOperand::CreateReg(MO.getReg());
102 case MachineOperand::MO_Immediate:
103 return MCOperand::CreateImm(MO.getImm());
104 case MachineOperand::MO_MachineBasicBlock:
105 case MachineOperand::MO_GlobalAddress:
106 case MachineOperand::MO_ExternalSymbol:
107 case MachineOperand::MO_JumpTableIndex:
108 case MachineOperand::MO_ConstantPoolIndex:
109 case MachineOperand::MO_BlockAddress:
110 return LowerSymbolOperand(MO, MOTy, 0);
111 }
112
113 return MCOperand();
114 }
115
Lower(const MachineInstr * MI,MCInst & OutMI) const116 void MipsMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
117 OutMI.setOpcode(MI->getOpcode());
118
119 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
120 const MachineOperand &MO = MI->getOperand(i);
121 MCOperand MCOp = LowerOperand(MO);
122
123 if (MCOp.isValid())
124 OutMI.addOperand(MCOp);
125 }
126 }
127