1 //===-- AArch64TargetObjectFile.cpp - AArch64 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 "AArch64TargetObjectFile.h" 11 #include "AArch64TargetMachine.h" 12 #include "llvm/BinaryFormat/Dwarf.h" 13 #include "llvm/IR/Mangler.h" 14 #include "llvm/MC/MCContext.h" 15 #include "llvm/MC/MCExpr.h" 16 #include "llvm/MC/MCStreamer.h" 17 #include "llvm/MC/MCValue.h" 18 using namespace llvm; 19 using namespace dwarf; 20 21 void AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx, 22 const TargetMachine &TM) { 23 TargetLoweringObjectFileELF::Initialize(Ctx, TM); 24 InitializeELF(TM.Options.UseInitArray); 25 } 26 27 AArch64_MachoTargetObjectFile::AArch64_MachoTargetObjectFile() 28 : TargetLoweringObjectFileMachO() { 29 SupportGOTPCRelWithOffset = false; 30 } 31 32 const MCExpr *AArch64_MachoTargetObjectFile::getTTypeGlobalReference( 33 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM, 34 MachineModuleInfo *MMI, MCStreamer &Streamer) const { 35 // On Darwin, we can reference dwarf symbols with foo@GOT-., which 36 // is an indirect pc-relative reference. The default implementation 37 // won't reference using the GOT, so we need this target-specific 38 // version. 39 if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) { 40 const MCSymbol *Sym = TM.getSymbol(GV); 41 const MCExpr *Res = 42 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, getContext()); 43 MCSymbol *PCSym = getContext().createTempSymbol(); 44 Streamer.EmitLabel(PCSym); 45 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); 46 return MCBinaryExpr::createSub(Res, PC, getContext()); 47 } 48 49 return TargetLoweringObjectFileMachO::getTTypeGlobalReference( 50 GV, Encoding, TM, MMI, Streamer); 51 } 52 53 MCSymbol *AArch64_MachoTargetObjectFile::getCFIPersonalitySymbol( 54 const GlobalValue *GV, const TargetMachine &TM, 55 MachineModuleInfo *MMI) const { 56 return TM.getSymbol(GV); 57 } 58 59 const MCExpr *AArch64_MachoTargetObjectFile::getIndirectSymViaGOTPCRel( 60 const MCSymbol *Sym, const MCValue &MV, int64_t Offset, 61 MachineModuleInfo *MMI, MCStreamer &Streamer) const { 62 assert((Offset+MV.getConstant() == 0) && 63 "Arch64 does not support GOT PC rel with extra offset"); 64 // On ARM64 Darwin, we can reference symbols with foo@GOT-., which 65 // is an indirect pc-relative reference. 66 const MCExpr *Res = 67 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, getContext()); 68 MCSymbol *PCSym = getContext().createTempSymbol(); 69 Streamer.EmitLabel(PCSym); 70 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); 71 return MCBinaryExpr::createSub(Res, PC, getContext()); 72 } 73 74 void AArch64_MachoTargetObjectFile::getNameWithPrefix( 75 SmallVectorImpl<char> &OutName, const GlobalValue *GV, 76 const TargetMachine &TM) const { 77 // AArch64 does not use section-relative relocations so any global symbol must 78 // be accessed via at least a linker-private symbol. 79 getMangler().getNameWithPrefix(OutName, GV, /* CannotUsePrivateLabel */ true); 80 } 81
