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"
18using namespace llvm;
19using namespace dwarf;
20
21void AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx,
22                                             const TargetMachine &TM) {
23  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
24  InitializeELF(TM.Options.UseInitArray);
25}
26
27AArch64_MachoTargetObjectFile::AArch64_MachoTargetObjectFile()
28  : TargetLoweringObjectFileMachO() {
29  SupportGOTPCRelWithOffset = false;
30}
31
32const 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
54MCSymbol *AArch64_MachoTargetObjectFile::getCFIPersonalitySymbol(
55    const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
56    MachineModuleInfo *MMI) const {
57  return TM.getSymbol(GV, Mang);
58}
59
60const 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