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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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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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7 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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8 //===----------------------------------------------------------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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9
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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10 #include "X86TargetObjectFile.h"
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11 #include "llvm/ADT/StringExtras.h"
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12 #include "llvm/IR/Mangler.h"
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13 #include "llvm/IR/Operator.h"
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14 #include "llvm/MC/MCContext.h"
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15 #include "llvm/MC/MCExpr.h"
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16 #include "llvm/MC/MCSectionCOFF.h"
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17 #include "llvm/MC/MCSectionELF.h"
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18 #include "llvm/MC/MCValue.h"
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19 #include "llvm/Support/COFF.h"
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20 #include "llvm/Support/Dwarf.h"
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21 #include "llvm/Target/TargetLowering.h"
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22
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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23 using namespace llvm;
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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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, Mangler &Mang,
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28 const TargetMachine &TM, MachineModuleInfo *MMI,
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29 MCStreamer &Streamer) const {
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30
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31 // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
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32 // is an indirect pc-relative reference.
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33 if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) {
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34 const MCSymbol *Sym = TM.getSymbol(GV, Mang);
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35 const MCExpr *Res =
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36 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
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37 const MCExpr *Four = MCConstantExpr::create(4, getContext());
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38 return MCBinaryExpr::createAdd(Res, Four, getContext());
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39 }
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40
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41 return TargetLoweringObjectFileMachO::getTTypeGlobalReference(
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42 GV, Encoding, Mang, TM, MMI, Streamer);
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43 }
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44
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45 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
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46 const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
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47 MachineModuleInfo *MMI) const {
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48 return TM.getSymbol(GV, Mang);
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49 }
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50
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51 const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel(
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52 const MCSymbol *Sym, const MCValue &MV, int64_t Offset,
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53 MachineModuleInfo *MMI, MCStreamer &Streamer) const {
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54 // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry
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55 // from a data section. In case there's an additional offset, then use
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56 // foo@GOTPCREL+4+<offset>.
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57 unsigned FinalOff = Offset+MV.getConstant()+4;
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58 const MCExpr *Res =
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59 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
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60 const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext());
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61 return MCBinaryExpr::createAdd(Res, Off, getContext());
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62 }
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63
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64 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
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65 const MCSymbol *Sym) const {
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66 return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
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67 }
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68
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69 void
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70 X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx,
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71 const TargetMachine &TM) {
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72 TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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73 InitializeELF(TM.Options.UseInitArray);
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74 }
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75
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76 const MCExpr *X86WindowsTargetObjectFile::getExecutableRelativeSymbol(
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77 const ConstantExpr *CE, Mangler &Mang, const TargetMachine &TM) const {
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78 // We are looking for the difference of two symbols, need a subtraction
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79 // operation.
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80 const SubOperator *Sub = dyn_cast<SubOperator>(CE);
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81 if (!Sub)
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82 return nullptr;
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83
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84 // Symbols must first be numbers before we can subtract them, we need to see a
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85 // ptrtoint on both subtraction operands.
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86 const PtrToIntOperator *SubLHS =
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87 dyn_cast<PtrToIntOperator>(Sub->getOperand(0));
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88 const PtrToIntOperator *SubRHS =
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89 dyn_cast<PtrToIntOperator>(Sub->getOperand(1));
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90 if (!SubLHS || !SubRHS)
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91 return nullptr;
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92
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93 // Our symbols should exist in address space zero, cowardly no-op if
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94 // otherwise.
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95 if (SubLHS->getPointerAddressSpace() != 0 ||
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96 SubRHS->getPointerAddressSpace() != 0)
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97 return nullptr;
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98
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99 // Both ptrtoint instructions must wrap global objects:
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100 // - Only global variables are eligible for image relative relocations.
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101 // - The subtrahend refers to the special symbol __ImageBase, a GlobalVariable.
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102 const auto *GOLHS = dyn_cast<GlobalObject>(SubLHS->getPointerOperand());
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103 const auto *GVRHS = dyn_cast<GlobalVariable>(SubRHS->getPointerOperand());
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104 if (!GOLHS || !GVRHS)
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105 return nullptr;
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106
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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 (GVRHS->isThreadLocal() || GVRHS->getName() != "__ImageBase" ||
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112 !GVRHS->hasExternalLinkage() || GVRHS->hasInitializer() ||
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113 GVRHS->hasSection())
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114 return nullptr;
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115
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116 // An image-relative, thread-local, symbol makes no sense.
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117 if (GOLHS->isThreadLocal())
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118 return nullptr;
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119
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120 return MCSymbolRefExpr::create(TM.getSymbol(GOLHS, Mang),
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121 MCSymbolRefExpr::VK_COFF_IMGREL32,
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122 getContext());
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123 }
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124
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125 static std::string APIntToHexString(const APInt &AI) {
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126 unsigned Width = (AI.getBitWidth() / 8) * 2;
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127 std::string HexString = utohexstr(AI.getLimitedValue(), /*LowerCase=*/true);
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128 unsigned Size = HexString.size();
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129 assert(Width >= Size && "hex string is too large!");
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130 HexString.insert(HexString.begin(), Width - Size, '0');
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131
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132 return HexString;
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133 }
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134
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135 static std::string scalarConstantToHexString(const Constant *C) {
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136 Type *Ty = C->getType();
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137 if (isa<UndefValue>(C)) {
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138 return APIntToHexString(APInt::getNullValue(Ty->getPrimitiveSizeInBits()));
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139 } else if (const auto *CFP = dyn_cast<ConstantFP>(C)) {
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140 return APIntToHexString(CFP->getValueAPF().bitcastToAPInt());
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141 } else if (const auto *CI = dyn_cast<ConstantInt>(C)) {
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142 return APIntToHexString(CI->getValue());
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143 } else {
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144 unsigned NumElements;
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145 if (isa<VectorType>(Ty))
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146 NumElements = Ty->getVectorNumElements();
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147 else
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148 NumElements = Ty->getArrayNumElements();
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149 std::string HexString;
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150 for (int I = NumElements - 1, E = -1; I != E; --I)
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151 HexString += scalarConstantToHexString(C->getAggregateElement(I));
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152 return HexString;
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153 }
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154 }
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155
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156 MCSection *X86WindowsTargetObjectFile::getSectionForConstant(
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157 const DataLayout &DL, SectionKind Kind, const Constant *C) const {
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158 if (Kind.isMergeableConst() && C) {
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159 const unsigned Characteristics = COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
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160 COFF::IMAGE_SCN_MEM_READ |
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161 COFF::IMAGE_SCN_LNK_COMDAT;
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162 std::string COMDATSymName;
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163 if (Kind.isMergeableConst4() || Kind.isMergeableConst8())
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164 COMDATSymName = "__real@" + scalarConstantToHexString(C);
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165 else if (Kind.isMergeableConst16())
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166 COMDATSymName = "__xmm@" + scalarConstantToHexString(C);
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167
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168 if (!COMDATSymName.empty())
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169 return getContext().getCOFFSection(".rdata", Characteristics, Kind,
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170 COMDATSymName,
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171 COFF::IMAGE_COMDAT_SELECT_ANY);
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172 }
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173
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174 return TargetLoweringObjectFile::getSectionForConstant(DL, Kind, C);
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175 }
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