322799aa50
There's an existing check in LLVM that can replace an offset to a DSO-local symbol that is just a pointer to another symbol with a GOTPCREL reloc. This is exactly what the RTTI proxy in the relative vtables ABI is. This feature is supported for different macho platforms, but not for ELF. This extends that support.
60 lines
2.4 KiB
C++
60 lines
2.4 KiB
C++
//===-- X86TargetObjectFile.h - X86 Object Info -----------------*- C++ -*-===//
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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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#ifndef LLVM_LIB_TARGET_X86_X86TARGETOBJECTFILE_H
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#define LLVM_LIB_TARGET_X86_X86TARGETOBJECTFILE_H
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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namespace llvm {
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/// X86_64MachoTargetObjectFile - This TLOF implementation is used for Darwin
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/// x86-64.
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class X86_64MachoTargetObjectFile : public TargetLoweringObjectFileMachO {
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public:
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const MCExpr *getTTypeGlobalReference(const GlobalValue *GV,
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unsigned Encoding,
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const TargetMachine &TM,
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MachineModuleInfo *MMI,
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MCStreamer &Streamer) const override;
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// getCFIPersonalitySymbol - The symbol that gets passed to
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// .cfi_personality.
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MCSymbol *getCFIPersonalitySymbol(const GlobalValue *GV,
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const TargetMachine &TM,
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MachineModuleInfo *MMI) const override;
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const MCExpr *getIndirectSymViaGOTPCRel(const GlobalValue *GV,
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const MCSymbol *Sym,
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const MCValue &MV, int64_t Offset,
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MachineModuleInfo *MMI,
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MCStreamer &Streamer) const override;
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};
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/// This implementation is used for X86 ELF targets that don't
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/// have a further specialization.
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class X86ELFTargetObjectFile : public TargetLoweringObjectFileELF {
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public:
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X86ELFTargetObjectFile() {
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PLTRelativeVariantKind = MCSymbolRefExpr::VK_PLT;
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SupportIndirectSymViaGOTPCRel = true;
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}
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/// Describe a TLS variable address within debug info.
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const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const override;
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const MCExpr *
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getIndirectSymViaGOTPCRel(const GlobalValue *GV, const MCSymbol *Sym,
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const MCValue &MV, int64_t Offset,
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MachineModuleInfo *MMI,
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MCStreamer &Streamer) const override;
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};
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} // end namespace llvm
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#endif
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