| //===-- AArch64TargetObjectFile.cpp - AArch64 Object Info -----------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "AArch64TargetObjectFile.h" |
| #include "AArch64TargetMachine.h" |
| #include "llvm/BinaryFormat/Dwarf.h" |
| #include "llvm/IR/Mangler.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCValue.h" |
| using namespace llvm; |
| using namespace dwarf; |
| |
| void AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx, |
| const TargetMachine &TM) { |
| TargetLoweringObjectFileELF::Initialize(Ctx, TM); |
| // AARCH64 ELF ABI does not define static relocation type for TLS offset |
| // within a module. Do not generate AT_location for TLS variables. |
| SupportDebugThreadLocalLocation = false; |
| } |
| |
| AArch64_MachoTargetObjectFile::AArch64_MachoTargetObjectFile() |
| : TargetLoweringObjectFileMachO() { |
| SupportGOTPCRelWithOffset = false; |
| } |
| |
| const MCExpr *AArch64_MachoTargetObjectFile::getTTypeGlobalReference( |
| const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM, |
| MachineModuleInfo *MMI, MCStreamer &Streamer) const { |
| // On Darwin, we can reference dwarf symbols with foo@GOT-., which |
| // is an indirect pc-relative reference. The default implementation |
| // won't reference using the GOT, so we need this target-specific |
| // version. |
| if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) { |
| const MCSymbol *Sym = TM.getSymbol(GV); |
| const MCExpr *Res = |
| MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, getContext()); |
| MCSymbol *PCSym = getContext().createTempSymbol(); |
| Streamer.emitLabel(PCSym); |
| const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); |
| return MCBinaryExpr::createSub(Res, PC, getContext()); |
| } |
| |
| return TargetLoweringObjectFileMachO::getTTypeGlobalReference( |
| GV, Encoding, TM, MMI, Streamer); |
| } |
| |
| MCSymbol *AArch64_MachoTargetObjectFile::getCFIPersonalitySymbol( |
| const GlobalValue *GV, const TargetMachine &TM, |
| MachineModuleInfo *MMI) const { |
| return TM.getSymbol(GV); |
| } |
| |
| const MCExpr *AArch64_MachoTargetObjectFile::getIndirectSymViaGOTPCRel( |
| const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV, |
| int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const { |
| assert((Offset+MV.getConstant() == 0) && |
| "Arch64 does not support GOT PC rel with extra offset"); |
| // On ARM64 Darwin, we can reference symbols with foo@GOT-., which |
| // is an indirect pc-relative reference. |
| const MCExpr *Res = |
| MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, getContext()); |
| MCSymbol *PCSym = getContext().createTempSymbol(); |
| Streamer.emitLabel(PCSym); |
| const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); |
| return MCBinaryExpr::createSub(Res, PC, getContext()); |
| } |
| |
| void AArch64_MachoTargetObjectFile::getNameWithPrefix( |
| SmallVectorImpl<char> &OutName, const GlobalValue *GV, |
| const TargetMachine &TM) const { |
| // AArch64 does not use section-relative relocations so any global symbol must |
| // be accessed via at least a linker-private symbol. |
| getMangler().getNameWithPrefix(OutName, GV, /* CannotUsePrivateLabel */ true); |
| } |