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