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