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) const31 MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
32 MachineOperandType MOTy) const {
33 MipsMCSymbolRefExpr::VariantKind Kind;
34 const MCSymbol *Symbol;
35 int Offset = 0;
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 }
50
51 switch (MOTy) {
52 case MachineOperand::MO_MachineBasicBlock:
53 Symbol = MO.getMBB()->getSymbol();
54 break;
55
56 case MachineOperand::MO_GlobalAddress:
57 Symbol = Mang->getSymbol(MO.getGlobal());
58 break;
59
60 case MachineOperand::MO_BlockAddress:
61 Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
62 break;
63
64 case MachineOperand::MO_ExternalSymbol:
65 Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
66 break;
67
68 case MachineOperand::MO_JumpTableIndex:
69 Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
70 break;
71
72 case MachineOperand::MO_ConstantPoolIndex:
73 Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
74 if (MO.getOffset())
75 Offset = MO.getOffset();
76 break;
77
78 default:
79 llvm_unreachable("<unknown operand type>");
80 }
81
82 return MCOperand::CreateExpr(MipsMCSymbolRefExpr::Create(Kind, Symbol, Offset,
83 Ctx));
84 }
85
Lower(const MachineInstr * MI,MCInst & OutMI) const86 void MipsMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
87 OutMI.setOpcode(MI->getOpcode());
88
89 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
90 const MachineOperand &MO = MI->getOperand(i);
91 MCOperand MCOp;
92 MachineOperandType MOTy = MO.getType();
93
94 switch (MOTy) {
95 default:
96 MI->dump();
97 llvm_unreachable("unknown operand type");
98 case MachineOperand::MO_Register:
99 // Ignore all implicit register operands.
100 if (MO.isImplicit()) continue;
101 MCOp = MCOperand::CreateReg(MO.getReg());
102 break;
103 case MachineOperand::MO_Immediate:
104 MCOp = MCOperand::CreateImm(MO.getImm());
105 break;
106 case MachineOperand::MO_MachineBasicBlock:
107 case MachineOperand::MO_GlobalAddress:
108 case MachineOperand::MO_ExternalSymbol:
109 case MachineOperand::MO_JumpTableIndex:
110 case MachineOperand::MO_ConstantPoolIndex:
111 case MachineOperand::MO_BlockAddress:
112 MCOp = LowerSymbolOperand(MO, MOTy);
113 break;
114 }
115
116 OutMI.addOperand(MCOp);
117 }
118 }
119