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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 
Initialize(MCContext & Ctx,const TargetMachine & TM)21 void AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx,
22                                              const TargetMachine &TM) {
23   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
24   InitializeELF(TM.Options.UseInitArray);
25 }
26 
AArch64_MachoTargetObjectFile()27 AArch64_MachoTargetObjectFile::AArch64_MachoTargetObjectFile()
28   : TargetLoweringObjectFileMachO() {
29   SupportGOTPCRelWithOffset = false;
30 }
31 
getTTypeGlobalReference(const GlobalValue * GV,unsigned Encoding,Mangler & Mang,const TargetMachine & TM,MachineModuleInfo * MMI,MCStreamer & Streamer) const32 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 
getCFIPersonalitySymbol(const GlobalValue * GV,Mangler & Mang,const TargetMachine & TM,MachineModuleInfo * MMI) const54 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 
getIndirectSymViaGOTPCRel(const MCSymbol * Sym,const MCValue & MV,int64_t Offset,MachineModuleInfo * MMI,MCStreamer & Streamer) const60 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