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/IR/Mangler.h" 13 #include "llvm/MC/MCContext.h" 14 #include "llvm/MC/MCExpr.h" 15 #include "llvm/MC/MCStreamer.h" 16 #include "llvm/MC/MCValue.h" 17 #include "llvm/Support/Dwarf.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, Mangler &Mang, 34 const TargetMachine &TM, MachineModuleInfo *MMI, 35 MCStreamer &Streamer) const { 36 // On Darwin, we can reference dwarf symbols with foo@GOT-., which 37 // is an indirect pc-relative reference. The default implementation 38 // won't reference using the GOT, so we need this target-specific 39 // version. 40 if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) { 41 const MCSymbol *Sym = TM.getSymbol(GV, Mang); 42 const MCExpr *Res = 43 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, getContext()); 44 MCSymbol *PCSym = getContext().createTempSymbol(); 45 Streamer.EmitLabel(PCSym); 46 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); 47 return MCBinaryExpr::createSub(Res, PC, getContext()); 48 } 49 50 return TargetLoweringObjectFileMachO::getTTypeGlobalReference( 51 GV, Encoding, Mang, TM, MMI, Streamer); 52 } 53 54 MCSymbol *AArch64_MachoTargetObjectFile::getCFIPersonalitySymbol( 55 const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM, 56 MachineModuleInfo *MMI) const { 57 return TM.getSymbol(GV, Mang); 58 } 59 60 const MCExpr *AArch64_MachoTargetObjectFile::getIndirectSymViaGOTPCRel( 61 const MCSymbol *Sym, const MCValue &MV, int64_t Offset, 62 MachineModuleInfo *MMI, MCStreamer &Streamer) const { 63 assert((Offset+MV.getConstant() == 0) && 64 "Arch64 does not support GOT PC rel with extra offset"); 65 // On ARM64 Darwin, we can reference symbols with foo@GOT-., which 66 // is an indirect pc-relative reference. 67 const MCExpr *Res = 68 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, getContext()); 69 MCSymbol *PCSym = getContext().createTempSymbol(); 70 Streamer.EmitLabel(PCSym); 71 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); 72 return MCBinaryExpr::createSub(Res, PC, getContext()); 73 } 74
