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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
83 lines
3.4 KiB
C++
83 lines
3.4 KiB
C++
//===-- 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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InitializeELF(TM.Options.UseInitArray);
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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 MCSymbol *Sym, const MCValue &MV, int64_t Offset,
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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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