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1 //===-- X86TargetObjectFile.cpp - X86 Object Info -------------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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2 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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3 // The LLVM Compiler Infrastructure
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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4 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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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 "X86TargetObjectFile.h"
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11 #include "llvm/ADT/StringExtras.h"
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121
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12 #include "llvm/BinaryFormat/COFF.h"
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13 #include "llvm/BinaryFormat/Dwarf.h"
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134
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14 #include "llvm/CodeGen/TargetLowering.h"
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15 #include "llvm/IR/Mangler.h"
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16 #include "llvm/IR/Operator.h"
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17 #include "llvm/MC/MCContext.h"
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18 #include "llvm/MC/MCExpr.h"
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19 #include "llvm/MC/MCSectionCOFF.h"
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20 #include "llvm/MC/MCSectionELF.h"
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21 #include "llvm/MC/MCValue.h"
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22
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23 using namespace llvm;
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24 using namespace dwarf;
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25
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26 const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference(
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27 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
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28 MachineModuleInfo *MMI, MCStreamer &Streamer) const {
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29
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30 // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
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31 // is an indirect pc-relative reference.
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32 if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) {
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33 const MCSymbol *Sym = TM.getSymbol(GV);
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34 const MCExpr *Res =
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35 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
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36 const MCExpr *Four = MCConstantExpr::create(4, getContext());
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37 return MCBinaryExpr::createAdd(Res, Four, getContext());
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38 }
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39
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40 return TargetLoweringObjectFileMachO::getTTypeGlobalReference(
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41 GV, Encoding, TM, MMI, Streamer);
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42 }
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43
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44 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
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45 const GlobalValue *GV, const TargetMachine &TM,
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46 MachineModuleInfo *MMI) const {
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47 return TM.getSymbol(GV);
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48 }
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49
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50 const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel(
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51 const MCSymbol *Sym, const MCValue &MV, int64_t Offset,
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52 MachineModuleInfo *MMI, MCStreamer &Streamer) const {
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53 // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry
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54 // from a data section. In case there's an additional offset, then use
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55 // foo@GOTPCREL+4+<offset>.
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56 unsigned FinalOff = Offset+MV.getConstant()+4;
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57 const MCExpr *Res =
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58 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
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59 const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext());
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60 return MCBinaryExpr::createAdd(Res, Off, getContext());
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61 }
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62
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63 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
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64 const MCSymbol *Sym) const {
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65 return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
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66 }
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67
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68 void
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69 X86FreeBSDTargetObjectFile::Initialize(MCContext &Ctx,
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70 const TargetMachine &TM) {
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71 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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72 InitializeELF(TM.Options.UseInitArray);
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73 }
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74
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75 void
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76 X86FuchsiaTargetObjectFile::Initialize(MCContext &Ctx,
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77 const TargetMachine &TM) {
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78 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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79 InitializeELF(TM.Options.UseInitArray);
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80 }
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81
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82 void
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83 X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx,
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84 const TargetMachine &TM) {
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85 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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86 InitializeELF(TM.Options.UseInitArray);
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87 }
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88
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89 void X86SolarisTargetObjectFile::Initialize(MCContext &Ctx,
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90 const TargetMachine &TM) {
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91 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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92 InitializeELF(TM.Options.UseInitArray);
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93 }
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94
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95 const MCExpr *X86WindowsTargetObjectFile::lowerRelativeReference(
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96 const GlobalValue *LHS, const GlobalValue *RHS,
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97 const TargetMachine &TM) const {
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98 // Our symbols should exist in address space zero, cowardly no-op if
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99 // otherwise.
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100 if (LHS->getType()->getPointerAddressSpace() != 0 ||
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101 RHS->getType()->getPointerAddressSpace() != 0)
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102 return nullptr;
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103
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104 // Both ptrtoint instructions must wrap global objects:
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105 // - Only global variables are eligible for image relative relocations.
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106 // - The subtrahend refers to the special symbol __ImageBase, a GlobalVariable.
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107 // We expect __ImageBase to be a global variable without a section, externally
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108 // defined.
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109 //
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110 // It should look something like this: @__ImageBase = external constant i8
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111 if (!isa<GlobalObject>(LHS) || !isa<GlobalVariable>(RHS) ||
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112 LHS->isThreadLocal() || RHS->isThreadLocal() ||
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113 RHS->getName() != "__ImageBase" || !RHS->hasExternalLinkage() ||
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114 cast<GlobalVariable>(RHS)->hasInitializer() || RHS->hasSection())
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115 return nullptr;
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116
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117 return MCSymbolRefExpr::create(TM.getSymbol(LHS),
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118 MCSymbolRefExpr::VK_COFF_IMGREL32,
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119 getContext());
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120 }
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121
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122 static std::string APIntToHexString(const APInt &AI) {
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123 unsigned Width = (AI.getBitWidth() / 8) * 2;
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124 std::string HexString = utohexstr(AI.getLimitedValue(), /*LowerCase=*/true);
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125 unsigned Size = HexString.size();
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126 assert(Width >= Size && "hex string is too large!");
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127 HexString.insert(HexString.begin(), Width - Size, '0');
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128
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129 return HexString;
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130 }
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131
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132 static std::string scalarConstantToHexString(const Constant *C) {
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133 Type *Ty = C->getType();
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134 if (isa<UndefValue>(C)) {
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135 return APIntToHexString(APInt::getNullValue(Ty->getPrimitiveSizeInBits()));
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136 } else if (const auto *CFP = dyn_cast<ConstantFP>(C)) {
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137 return APIntToHexString(CFP->getValueAPF().bitcastToAPInt());
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138 } else if (const auto *CI = dyn_cast<ConstantInt>(C)) {
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139 return APIntToHexString(CI->getValue());
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140 } else {
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141 unsigned NumElements;
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142 if (isa<VectorType>(Ty))
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143 NumElements = Ty->getVectorNumElements();
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144 else
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145 NumElements = Ty->getArrayNumElements();
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146 std::string HexString;
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147 for (int I = NumElements - 1, E = -1; I != E; --I)
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148 HexString += scalarConstantToHexString(C->getAggregateElement(I));
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149 return HexString;
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150 }
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151 }
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152
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153 MCSection *X86WindowsTargetObjectFile::getSectionForConstant(
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154 const DataLayout &DL, SectionKind Kind, const Constant *C,
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155 unsigned &Align) const {
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156 if (Kind.isMergeableConst() && C) {
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157 const unsigned Characteristics = COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
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158 COFF::IMAGE_SCN_MEM_READ |
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159 COFF::IMAGE_SCN_LNK_COMDAT;
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160 std::string COMDATSymName;
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161 if (Kind.isMergeableConst4()) {
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162 if (Align <= 4) {
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163 COMDATSymName = "__real@" + scalarConstantToHexString(C);
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164 Align = 4;
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165 }
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166 } else if (Kind.isMergeableConst8()) {
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167 if (Align <= 8) {
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168 COMDATSymName = "__real@" + scalarConstantToHexString(C);
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169 Align = 8;
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170 }
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171 } else if (Kind.isMergeableConst16()) {
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172 if (Align <= 16) {
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173 COMDATSymName = "__xmm@" + scalarConstantToHexString(C);
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174 Align = 16;
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175 }
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176 } else if (Kind.isMergeableConst32()) {
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177 if (Align <= 32) {
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178 COMDATSymName = "__ymm@" + scalarConstantToHexString(C);
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179 Align = 32;
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180 }
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181 }
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182
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183 if (!COMDATSymName.empty())
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184 return getContext().getCOFFSection(".rdata", Characteristics, Kind,
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185 COMDATSymName,
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186 COFF::IMAGE_COMDAT_SELECT_ANY);
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187 }
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188
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189 return TargetLoweringObjectFile::getSectionForConstant(DL, Kind, C, Align);
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190 }
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