LLVM 18.0.0git
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1//===-- AArch64TargetObjectFile.cpp - AArch64 Object Info -----------------===//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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"
17using namespace llvm;
18using namespace dwarf;
20void AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx,
21 const TargetMachine &TM) {
23 // AARCH64 ELF ABI does not define static relocation type for TLS offset
24 // within a module. Do not generate AT_location for TLS variables.
33 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
34 MachineModuleInfo *MMI, MCStreamer &Streamer) const {
35 // On Darwin, we can reference dwarf symbols with foo@GOT-., which
36 // is an indirect pc-relative reference. The default implementation
37 // won't reference using the GOT, so we need this target-specific
38 // version.
39 if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) {
40 const MCSymbol *Sym = TM.getSymbol(GV);
41 const MCExpr *Res =
44 Streamer.emitLabel(PCSym);
45 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext());
46 return MCBinaryExpr::createSub(Res, PC, getContext());
47 }
50 GV, Encoding, TM, MMI, Streamer);
54 const GlobalValue *GV, const TargetMachine &TM,
55 MachineModuleInfo *MMI) const {
56 return TM.getSymbol(GV);
60 const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV,
61 int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const {
62 assert((Offset+MV.getConstant() == 0) &&
63 "Arch64 does not support GOT PC rel with extra offset");
64 // On ARM64 Darwin, we can reference symbols with foo@GOT-., which
65 // is an indirect pc-relative reference.
66 const MCExpr *Res =
69 Streamer.emitLabel(PCSym);
70 const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext());
71 return MCBinaryExpr::createSub(Res, PC, getContext());
75 SmallVectorImpl<char> &OutName, const GlobalValue *GV,
76 const TargetMachine &TM) const {
77 // AArch64 does not use section-relative relocations so any global symbol must
78 // be accessed via at least a linker-private symbol.
79 getMangler().getNameWithPrefix(OutName, GV, /* CannotUsePrivateLabel */ true);
This file contains constants used for implementing Dwarf debug support.
Symbol * Sym
Definition: ELF_riscv.cpp:477
const char LLVMTargetMachineRef TM
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
const MCExpr * getIndirectSymViaGOTPCRel(const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV, int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const override
Get MachO PC relative GOT entry relocation.
void getNameWithPrefix(SmallVectorImpl< char > &OutName, const GlobalValue *GV, const TargetMachine &TM) const override
MCSymbol * getCFIPersonalitySymbol(const GlobalValue *GV, const TargetMachine &TM, MachineModuleInfo *MMI) const override
const MCExpr * getTTypeGlobalReference(const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM, MachineModuleInfo *MMI, MCStreamer &Streamer) const override
The mach-o version of this method defaults to returning a stub reference.
static const MCBinaryExpr * createSub(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:613
Context object for machine code objects.
Definition: MCContext.h:76
MCSymbol * createTempSymbol()
Create a temporary symbol with a unique name.
Definition: MCContext.cpp:321
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35
MCContext & getContext() const
Streaming machine code generation interface.
Definition: MCStreamer.h:212
virtual void emitLabel(MCSymbol *Symbol, SMLoc Loc=SMLoc())
Emit a label for Symbol into the current section.
Definition: MCStreamer.cpp:424
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:389
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:40
This represents an "assembler immediate".
Definition: MCValue.h:36
int64_t getConstant() const
Definition: MCValue.h:43
This class contains meta information specific to a module.
void getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV, bool CannotUsePrivateLabel) const
Print the appropriate prefix and the specified global variable's name.
Definition: Mangler.cpp:119
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: SmallVector.h:577
void Initialize(MCContext &Ctx, const TargetMachine &TM) override
This method must be called before any actual lowering is done.
const MCExpr * getTTypeGlobalReference(const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM, MachineModuleInfo *MMI, MCStreamer &Streamer) const override
The mach-o version of this method defaults to returning a stub reference.
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:78
MCSymbol * getSymbol(const GlobalValue *GV) const
@ DW_EH_PE_pcrel
Definition: Dwarf.h:534
@ DW_EH_PE_indirect
Definition: Dwarf.h:539
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ Offset
Definition: DWP.cpp:456