1 //===-- llvm/Target/X86/X86TargetObjectFile.cpp - X86 Object Info ---------===// 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 #include "X86MCTargetExpr.h" 11 #include "X86TargetObjectFile.h" 12 #include "X86TargetMachine.h" 13 #include "llvm/CodeGen/MachineModuleInfoImpls.h" 14 #include "llvm/MC/MCContext.h" 15 #include "llvm/Target/Mangler.h" 16 #include "llvm/ADT/SmallString.h" 17 #include "llvm/Support/Dwarf.h" 18 using namespace llvm; 19 using namespace dwarf; 20 21 const MCExpr *X8632_MachoTargetObjectFile:: 22 getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, 23 MachineModuleInfo *MMI, unsigned Encoding) const { 24 // The mach-o version of this method defaults to returning a stub reference. 25 26 if (Encoding & DW_EH_PE_indirect) { 27 MachineModuleInfoMachO &MachOMMI = 28 MMI->getObjFileInfo<MachineModuleInfoMachO>(); 29 30 SmallString<128> Name; 31 Mang->getNameWithPrefix(Name, GV, true); 32 Name += "$non_lazy_ptr"; 33 34 // Add information about the stub reference to MachOMMI so that the stub 35 // gets emitted by the asmprinter. 36 MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str()); 37 MCSymbol *&StubSym = MachOMMI.getGVStubEntry(Sym); 38 if (StubSym == 0) { 39 Name.clear(); 40 Mang->getNameWithPrefix(Name, GV, false); 41 StubSym = getContext().GetOrCreateSymbol(Name.str()); 42 } 43 44 return TargetLoweringObjectFile:: 45 getSymbolForDwarfReference(Sym, MMI, 46 Encoding & ~dwarf::DW_EH_PE_indirect); 47 } 48 49 return TargetLoweringObjectFileMachO:: 50 getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding); 51 } 52 53 const MCExpr *X8664_MachoTargetObjectFile:: 54 getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, 55 MachineModuleInfo *MMI, unsigned Encoding) const { 56 57 // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which 58 // is an indirect pc-relative reference. 59 if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) { 60 SmallString<128> Name; 61 Mang->getNameWithPrefix(Name, GV, false); 62 const MCSymbol *Sym = getContext().GetOrCreateSymbol(Name); 63 const MCExpr *Res = 64 X86MCTargetExpr::Create(Sym, X86MCTargetExpr::GOTPCREL, getContext()); 65 const MCExpr *Four = MCConstantExpr::Create(4, getContext()); 66 return MCBinaryExpr::CreateAdd(Res, Four, getContext()); 67 } 68 69 return TargetLoweringObjectFileMachO:: 70 getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding); 71 } 72 73 unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const { 74 if (TM.getRelocationModel() == Reloc::PIC_) 75 return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4; 76 else 77 return DW_EH_PE_absptr; 78 } 79 80 unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const { 81 if (TM.getRelocationModel() == Reloc::PIC_) 82 return DW_EH_PE_pcrel | DW_EH_PE_sdata4; 83 else 84 return DW_EH_PE_absptr; 85 } 86 87 unsigned X8632_ELFTargetObjectFile::getFDEEncoding() const { 88 if (TM.getRelocationModel() == Reloc::PIC_) 89 return DW_EH_PE_pcrel | DW_EH_PE_sdata4; 90 else 91 return DW_EH_PE_absptr; 92 } 93 94 unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const { 95 if (TM.getRelocationModel() == Reloc::PIC_) 96 return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4; 97 else 98 return DW_EH_PE_absptr; 99 } 100 101 unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const { 102 CodeModel::Model Model = TM.getCodeModel(); 103 if (TM.getRelocationModel() == Reloc::PIC_) 104 return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small || 105 Model == CodeModel::Medium ? 106 DW_EH_PE_sdata4 : DW_EH_PE_sdata8); 107 108 if (Model == CodeModel::Small || Model == CodeModel::Medium) 109 return DW_EH_PE_udata4; 110 111 return DW_EH_PE_absptr; 112 } 113 114 unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const { 115 CodeModel::Model Model = TM.getCodeModel(); 116 if (TM.getRelocationModel() == Reloc::PIC_) 117 return DW_EH_PE_pcrel | (Model == CodeModel::Small ? 118 DW_EH_PE_sdata4 : DW_EH_PE_sdata8); 119 120 if (Model == CodeModel::Small) 121 return DW_EH_PE_udata4; 122 123 return DW_EH_PE_absptr; 124 } 125 126 unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const { 127 CodeModel::Model Model = TM.getCodeModel(); 128 if (TM.getRelocationModel() == Reloc::PIC_) 129 return DW_EH_PE_pcrel | (Model == CodeModel::Small || 130 Model == CodeModel::Medium ? 131 DW_EH_PE_sdata4 : DW_EH_PE_sdata8); 132 133 if (Model == CodeModel::Small || Model == CodeModel::Medium) 134 return DW_EH_PE_udata4; 135 136 return DW_EH_PE_absptr; 137 } 138 139 unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const { 140 CodeModel::Model Model = TM.getCodeModel(); 141 if (TM.getRelocationModel() == Reloc::PIC_) 142 return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small || 143 Model == CodeModel::Medium ? 144 DW_EH_PE_sdata4 : DW_EH_PE_sdata8); 145 146 if (Model == CodeModel::Small) 147 return DW_EH_PE_udata4; 148 149 return DW_EH_PE_absptr; 150 } 151