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annotate lib/Target/SystemZ/SystemZMCInstLower.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===-- SystemZMCInstLower.cpp - Lower MachineInstr to MCInst -------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "SystemZMCInstLower.h"
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11 #include "SystemZAsmPrinter.h"
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12 #include "llvm/MC/MCExpr.h"
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13 #include "llvm/MC/MCStreamer.h"
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14 #include "llvm/Target/Mangler.h"
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15
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16 using namespace llvm;
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17
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18 // Return the VK_* enumeration for MachineOperand target flags Flags.
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19 static MCSymbolRefExpr::VariantKind getVariantKind(unsigned Flags) {
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20 switch (Flags & SystemZII::MO_SYMBOL_MODIFIER) {
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21 case 0:
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22 return MCSymbolRefExpr::VK_None;
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23 case SystemZII::MO_GOT:
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24 return MCSymbolRefExpr::VK_GOT;
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25 }
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26 llvm_unreachable("Unrecognised MO_ACCESS_MODEL");
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27 }
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28
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29 SystemZMCInstLower::SystemZMCInstLower(MCContext &ctx,
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30 SystemZAsmPrinter &asmprinter)
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31 : Ctx(ctx), AsmPrinter(asmprinter) {}
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32
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33 const MCExpr *
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34 SystemZMCInstLower::getExpr(const MachineOperand &MO,
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35 MCSymbolRefExpr::VariantKind Kind) const {
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36 const MCSymbol *Symbol;
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37 bool HasOffset = true;
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38 switch (MO.getType()) {
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39 case MachineOperand::MO_MachineBasicBlock:
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40 Symbol = MO.getMBB()->getSymbol();
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41 HasOffset = false;
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42 break;
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43
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44 case MachineOperand::MO_GlobalAddress:
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45 Symbol = AsmPrinter.getSymbol(MO.getGlobal());
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46 break;
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47
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48 case MachineOperand::MO_ExternalSymbol:
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49 Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
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50 break;
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51
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52 case MachineOperand::MO_JumpTableIndex:
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53 Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
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54 HasOffset = false;
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55 break;
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56
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57 case MachineOperand::MO_ConstantPoolIndex:
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58 Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
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59 break;
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60
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61 case MachineOperand::MO_BlockAddress:
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62 Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
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63 break;
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64
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65 default:
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66 llvm_unreachable("unknown operand type");
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67 }
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68 const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, Kind, Ctx);
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69 if (HasOffset)
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70 if (int64_t Offset = MO.getOffset()) {
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71 const MCExpr *OffsetExpr = MCConstantExpr::Create(Offset, Ctx);
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72 Expr = MCBinaryExpr::CreateAdd(Expr, OffsetExpr, Ctx);
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73 }
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74 return Expr;
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75 }
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76
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77 MCOperand SystemZMCInstLower::lowerOperand(const MachineOperand &MO) const {
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78 switch (MO.getType()) {
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79 case MachineOperand::MO_Register:
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80 return MCOperand::CreateReg(MO.getReg());
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81
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82 case MachineOperand::MO_Immediate:
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83 return MCOperand::CreateImm(MO.getImm());
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84
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85 default: {
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86 MCSymbolRefExpr::VariantKind Kind = getVariantKind(MO.getTargetFlags());
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87 return MCOperand::CreateExpr(getExpr(MO, Kind));
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88 }
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89 }
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90 }
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91
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92 void SystemZMCInstLower::lower(const MachineInstr *MI, MCInst &OutMI) const {
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93 OutMI.setOpcode(MI->getOpcode());
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94 for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
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95 const MachineOperand &MO = MI->getOperand(I);
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96 // Ignore all implicit register operands.
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97 if (!MO.isReg() || !MO.isImplicit())
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98 OutMI.addOperand(lowerOperand(MO));
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99 }
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100 }