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llvm-project/lld/ELF/InputSection.cpp

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//===- InputSection.cpp ---------------------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "InputSection.h"
#include "Config.h"
#include "EhFrame.h"
#include "Error.h"
#include "InputFiles.h"
#include "OutputSections.h"
#include "Target.h"
#include "llvm/Support/Endian.h"
using namespace llvm;
using namespace llvm::ELF;
using namespace llvm::object;
using namespace llvm::support::endian;
using namespace lld;
using namespace lld::elf;
template <class ELFT>
InputSectionBase<ELFT>::InputSectionBase(elf::ObjectFile<ELFT> *File,
const Elf_Shdr *Header,
Kind SectionKind)
: Header(Header), File(File), SectionKind(SectionKind), Repl(this) {
// The garbage collector sets sections' Live bits.
// If GC is disabled, all sections are considered live by default.
Live = !Config->GcSections;
// The ELF spec states that a value of 0 means the section has
// no alignment constraits.
Alignment = std::max<uintX_t>(Header->sh_addralign, 1);
}
template <class ELFT> size_t InputSectionBase<ELFT>::getSize() const {
if (auto *D = dyn_cast<InputSection<ELFT>>(this))
if (D->getThunksSize() > 0)
return D->getThunkOff() + D->getThunksSize();
return Header->sh_size;
}
template <class ELFT> StringRef InputSectionBase<ELFT>::getSectionName() const {
return check(File->getObj().getSectionName(this->Header));
}
template <class ELFT>
ArrayRef<uint8_t> InputSectionBase<ELFT>::getSectionData() const {
return check(this->File->getObj().getSectionContents(this->Header));
}
template <class ELFT>
typename ELFT::uint InputSectionBase<ELFT>::getOffset(uintX_t Offset) {
switch (SectionKind) {
case Regular:
return cast<InputSection<ELFT>>(this)->OutSecOff + Offset;
case EHFrame:
return cast<EhInputSection<ELFT>>(this)->getOffset(Offset);
case Merge:
return cast<MergeInputSection<ELFT>>(this)->getOffset(Offset);
case MipsReginfo:
case MipsOptions:
// MIPS .reginfo and .MIPS.options sections are consumed by the linker,
// and the linker produces a single output section. It is possible that
// input files contain section symbol points to the corresponding input
// section. Redirect it to the produced output section.
if (Offset != 0)
fatal("Unsupported reference to the middle of '" + getSectionName() +
"' section");
return this->OutSec->getVA();
}
llvm_unreachable("invalid section kind");
}
template <class ELFT>
typename ELFT::uint
InputSectionBase<ELFT>::getOffset(const DefinedRegular<ELFT> &Sym) {
return getOffset(Sym.Value);
}
template <class ELFT>
InputSection<ELFT>::InputSection(elf::ObjectFile<ELFT> *F,
const Elf_Shdr *Header)
: InputSectionBase<ELFT>(F, Header, Base::Regular) {}
template <class ELFT>
bool InputSection<ELFT>::classof(const InputSectionBase<ELFT> *S) {
return S->SectionKind == Base::Regular;
}
template <class ELFT>
InputSectionBase<ELFT> *InputSection<ELFT>::getRelocatedSection() {
assert(this->Header->sh_type == SHT_RELA || this->Header->sh_type == SHT_REL);
ArrayRef<InputSectionBase<ELFT> *> Sections = this->File->getSections();
return Sections[this->Header->sh_info];
}
template <class ELFT> void InputSection<ELFT>::addThunk(SymbolBody &Body) {
Body.ThunkIndex = Thunks.size();
Thunks.push_back(&Body);
}
template <class ELFT> uint64_t InputSection<ELFT>::getThunkOff() const {
return this->Header->sh_size;
}
template <class ELFT> uint64_t InputSection<ELFT>::getThunksSize() const {
return Thunks.size() * Target->ThunkSize;
}
// This is used for -r. We can't use memcpy to copy relocations because we need
// to update symbol table offset and section index for each relocation. So we
// copy relocations one by one.
template <class ELFT>
template <class RelTy>
void InputSection<ELFT>::copyRelocations(uint8_t *Buf, ArrayRef<RelTy> Rels) {
InputSectionBase<ELFT> *RelocatedSection = getRelocatedSection();
for (const RelTy &Rel : Rels) {
uint32_t Type = Rel.getType(Config->Mips64EL);
SymbolBody &Body = this->File->getRelocTargetSym(Rel);
RelTy *P = reinterpret_cast<RelTy *>(Buf);
Buf += sizeof(RelTy);
P->r_offset = RelocatedSection->getOffset(Rel.r_offset);
P->setSymbolAndType(Body.DynsymIndex, Type, Config->Mips64EL);
}
}
// Page(Expr) is the page address of the expression Expr, defined
// as (Expr & ~0xFFF). (This applies even if the machine page size
// supported by the platform has a different value.)
static uint64_t getAArch64Page(uint64_t Expr) {
return Expr & (~static_cast<uint64_t>(0xFFF));
}
template <class ELFT>
static typename ELFT::uint
getSymVA(uint32_t Type, typename ELFT::uint A, typename ELFT::uint P,
const SymbolBody &Body, uint8_t *BufLoc,
const elf::ObjectFile<ELFT> &File, RelExpr Expr) {
typedef typename ELFT::uint uintX_t;
switch (Expr) {
case R_HINT:
llvm_unreachable("cannot relocate hint relocs");
case R_TLSLD:
return Out<ELFT>::Got->getTlsIndexOff() + A -
Out<ELFT>::Got->getNumEntries() * sizeof(uintX_t);
case R_TLSLD_PC:
return Out<ELFT>::Got->getTlsIndexVA() + A - P;
case R_THUNK:
return Body.getThunkVA<ELFT>();
case R_PPC_TOC:
return getPPC64TocBase() + A;
case R_TLSGD:
return Out<ELFT>::Got->getGlobalDynOffset(Body) + A -
Out<ELFT>::Got->getNumEntries() * sizeof(uintX_t);
case R_TLSGD_PC:
return Out<ELFT>::Got->getGlobalDynAddr(Body) + A - P;
case R_TLSDESC:
return Out<ELFT>::Got->getGlobalDynAddr(Body) + A;
case R_TLSDESC_PAGE:
return getAArch64Page(Out<ELFT>::Got->getGlobalDynAddr(Body) + A) -
getAArch64Page(P);
case R_PLT:
return Body.getPltVA<ELFT>() + A;
case R_PLT_PC:
case R_PPC_PLT_OPD:
return Body.getPltVA<ELFT>() + A - P;
case R_SIZE:
return Body.getSize<ELFT>() + A;
case R_GOTREL:
return Body.getVA<ELFT>(A) - Out<ELFT>::Got->getVA();
case R_RELAX_TLS_GD_TO_IE_END:
case R_GOT_FROM_END:
return Body.getGotOffset<ELFT>() + A -
Out<ELFT>::Got->getNumEntries() * sizeof(uintX_t);
case R_RELAX_TLS_GD_TO_IE_ABS:
case R_GOT:
return Body.getGotVA<ELFT>() + A;
case R_RELAX_TLS_GD_TO_IE_PAGE_PC:
case R_GOT_PAGE_PC:
return getAArch64Page(Body.getGotVA<ELFT>() + A) - getAArch64Page(P);
case R_RELAX_TLS_GD_TO_IE:
case R_GOT_PC:
return Body.getGotVA<ELFT>() + A - P;
case R_GOTONLY_PC:
return Out<ELFT>::Got->getVA() + A - P;
case R_RELAX_TLS_LD_TO_LE:
case R_RELAX_TLS_IE_TO_LE:
case R_RELAX_TLS_GD_TO_LE:
case R_TLS:
if (Target->TcbSize)
return Body.getVA<ELFT>(A) +
alignTo(Target->TcbSize, Out<ELFT>::TlsPhdr->p_align);
return Body.getVA<ELFT>(A) - Out<ELFT>::TlsPhdr->p_memsz;
case R_RELAX_TLS_GD_TO_LE_NEG:
case R_NEG_TLS:
return Out<ELF32LE>::TlsPhdr->p_memsz - Body.getVA<ELFT>(A);
case R_ABS:
case R_RELAX_GOT_PC_NOPIC:
return Body.getVA<ELFT>(A);
case R_GOT_OFF:
return Body.getGotOffset<ELFT>() + A;
case R_MIPS_GOT_LOCAL_PAGE:
// If relocation against MIPS local symbol requires GOT entry, this entry
// should be initialized by 'page address'. This address is high 16-bits
// of sum the symbol's value and the addend.
return Out<ELFT>::Got->getMipsLocalPageOffset(Body.getVA<ELFT>(A));
case R_MIPS_GOT_LOCAL:
// For non-local symbols GOT entries should contain their full
// addresses. But if such symbol cannot be preempted, we do not
// have to put them into the "global" part of GOT and use dynamic
// linker to determine their actual addresses. That is why we
// create GOT entries for them in the "local" part of GOT.
return Out<ELFT>::Got->getMipsLocalEntryOffset(Body.getVA<ELFT>(A));
case R_PPC_OPD: {
uint64_t SymVA = Body.getVA<ELFT>(A);
// If we have an undefined weak symbol, we might get here with a symbol
// address of zero. That could overflow, but the code must be unreachable,
// so don't bother doing anything at all.
if (!SymVA)
return 0;
if (Out<ELF64BE>::Opd) {
// If this is a local call, and we currently have the address of a
// function-descriptor, get the underlying code address instead.
uint64_t OpdStart = Out<ELF64BE>::Opd->getVA();
uint64_t OpdEnd = OpdStart + Out<ELF64BE>::Opd->getSize();
bool InOpd = OpdStart <= SymVA && SymVA < OpdEnd;
if (InOpd)
SymVA = read64be(&Out<ELF64BE>::OpdBuf[SymVA - OpdStart]);
}
return SymVA - P;
}
case R_PC:
case R_RELAX_GOT_PC:
return Body.getVA<ELFT>(A) - P;
case R_PLT_PAGE_PC:
case R_PAGE_PC:
return getAArch64Page(Body.getVA<ELFT>(A)) - getAArch64Page(P);
}
llvm_unreachable("Invalid expression");
}
// This function applies relocations to sections without SHF_ALLOC bit.
// Such sections are never mapped to memory at runtime. Debug sections are
// an example. Relocations in non-alloc sections are much easier to
// handle than in allocated sections because it will never need complex
// treatement such as GOT or PLT (because at runtime no one refers them).
// So, we handle relocations for non-alloc sections directly in this
// function as a performance optimization.
template <class ELFT>
template <class RelTy>
void InputSection<ELFT>::relocateNonAlloc(uint8_t *Buf, ArrayRef<RelTy> Rels) {
const unsigned Bits = sizeof(uintX_t) * 8;
for (const RelTy &Rel : Rels) {
uint32_t Type = Rel.getType(Config->Mips64EL);
uintX_t Offset = this->getOffset(Rel.r_offset);
uint8_t *BufLoc = Buf + Offset;
uintX_t Addend = getAddend<ELFT>(Rel);
if (!RelTy::IsRela)
Addend += Target->getImplicitAddend(BufLoc, Type);
SymbolBody &Sym = this->File->getRelocTargetSym(Rel);
if (Target->getRelExpr(Type, Sym) != R_ABS) {
error(this->getSectionName() + " has non-ABS reloc");
return;
}
uintX_t AddrLoc = this->OutSec->getVA() + Offset;
uint64_t SymVA = SignExtend64<Bits>(getSymVA<ELFT>(
Type, Addend, AddrLoc, Sym, BufLoc, *this->File, R_ABS));
Target->relocateOne(BufLoc, Type, SymVA);
}
}
template <class ELFT>
void InputSectionBase<ELFT>::relocate(uint8_t *Buf, uint8_t *BufEnd) {
// scanReloc function in Writer.cpp constructs Relocations
// vector only for SHF_ALLOC'ed sections. For other sections,
// we handle relocations directly here.
auto *IS = dyn_cast<InputSection<ELFT>>(this);
if (IS && !(IS->Header->sh_flags & SHF_ALLOC)) {
for (const Elf_Shdr *RelSec : IS->RelocSections) {
if (RelSec->sh_type == SHT_RELA)
IS->relocateNonAlloc(Buf, IS->File->getObj().relas(RelSec));
else
IS->relocateNonAlloc(Buf, IS->File->getObj().rels(RelSec));
}
return;
}
const unsigned Bits = sizeof(uintX_t) * 8;
for (const Relocation &Rel : Relocations) {
uintX_t Offset = Rel.Offset;
uint8_t *BufLoc = Buf + Offset;
uint32_t Type = Rel.Type;
uintX_t A = Rel.Addend;
uintX_t AddrLoc = OutSec->getVA() + Offset;
RelExpr Expr = Rel.Expr;
uint64_t SymVA = SignExtend64<Bits>(
getSymVA<ELFT>(Type, A, AddrLoc, *Rel.Sym, BufLoc, *File, Expr));
switch (Expr) {
case R_RELAX_GOT_PC:
case R_RELAX_GOT_PC_NOPIC:
Target->relaxGot(BufLoc, SymVA);
break;
case R_RELAX_TLS_IE_TO_LE:
Target->relaxTlsIeToLe(BufLoc, Type, SymVA);
break;
case R_RELAX_TLS_LD_TO_LE:
Target->relaxTlsLdToLe(BufLoc, Type, SymVA);
break;
case R_RELAX_TLS_GD_TO_LE:
case R_RELAX_TLS_GD_TO_LE_NEG:
Target->relaxTlsGdToLe(BufLoc, Type, SymVA);
break;
case R_RELAX_TLS_GD_TO_IE:
case R_RELAX_TLS_GD_TO_IE_ABS:
case R_RELAX_TLS_GD_TO_IE_PAGE_PC:
case R_RELAX_TLS_GD_TO_IE_END:
Target->relaxTlsGdToIe(BufLoc, Type, SymVA);
break;
case R_PPC_PLT_OPD:
// Patch a nop (0x60000000) to a ld.
if (BufLoc + 8 <= BufEnd && read32be(BufLoc + 4) == 0x60000000)
write32be(BufLoc + 4, 0xe8410028); // ld %r2, 40(%r1)
// fallthrough
default:
Target->relocateOne(BufLoc, Type, SymVA);
break;
}
}
}
template <class ELFT> void InputSection<ELFT>::writeTo(uint8_t *Buf) {
if (this->Header->sh_type == SHT_NOBITS)
return;
ELFFile<ELFT> &EObj = this->File->getObj();
// If -r is given, then an InputSection may be a relocation section.
if (this->Header->sh_type == SHT_RELA) {
copyRelocations(Buf + OutSecOff, EObj.relas(this->Header));
return;
}
if (this->Header->sh_type == SHT_REL) {
copyRelocations(Buf + OutSecOff, EObj.rels(this->Header));
return;
}
// Copy section contents from source object file to output file.
ArrayRef<uint8_t> Data = this->getSectionData();
memcpy(Buf + OutSecOff, Data.data(), Data.size());
// Iterate over all relocation sections that apply to this section.
uint8_t *BufEnd = Buf + OutSecOff + Data.size();
this->relocate(Buf, BufEnd);
// The section might have a data/code generated by the linker and need
// to be written after the section. Usually these are thunks - small piece
// of code used to jump between "incompatible" functions like PIC and non-PIC
// or if the jump target too far and its address does not fit to the short
// jump istruction.
if (!Thunks.empty()) {
Buf += OutSecOff + getThunkOff();
for (const SymbolBody *S : Thunks) {
Target->writeThunk(Buf, S->getVA<ELFT>());
Buf += Target->ThunkSize;
}
}
}
template <class ELFT>
void InputSection<ELFT>::replace(InputSection<ELFT> *Other) {
this->Alignment = std::max(this->Alignment, Other->Alignment);
Other->Repl = this->Repl;
Other->Live = false;
}
template <class ELFT>
SplitInputSection<ELFT>::SplitInputSection(
elf::ObjectFile<ELFT> *File, const Elf_Shdr *Header,
typename InputSectionBase<ELFT>::Kind SectionKind)
: InputSectionBase<ELFT>(File, Header, SectionKind) {}
template <class ELFT>
EhInputSection<ELFT>::EhInputSection(elf::ObjectFile<ELFT> *F,
const Elf_Shdr *Header)
: SplitInputSection<ELFT>(F, Header, InputSectionBase<ELFT>::EHFrame) {
// Mark .eh_frame sections as live by default because there are
// usually no relocations that point to .eh_frames. Otherwise,
// the garbage collector would drop all .eh_frame sections.
this->Live = true;
}
template <class ELFT>
bool EhInputSection<ELFT>::classof(const InputSectionBase<ELFT> *S) {
return S->SectionKind == InputSectionBase<ELFT>::EHFrame;
}
// .eh_frame is a sequence of CIE or FDE records.
// This function splits an input section into records and returns them.
template <class ELFT>
void EhInputSection<ELFT>::split() {
ArrayRef<uint8_t> Data = this->getSectionData();
for (size_t Off = 0, End = Data.size(); Off != End;) {
size_t Size = readEhRecordSize<ELFT>(Data.slice(Off));
this->Pieces.emplace_back(Off, Data.slice(Off, Size));
// The empty record is the end marker.
if (Size == 4)
break;
Off += Size;
}
}
template <class ELFT>
typename ELFT::uint EhInputSection<ELFT>::getOffset(uintX_t Offset) {
// The file crtbeginT.o has relocations pointing to the start of an empty
// .eh_frame that is known to be the first in the link. It does that to
// identify the start of the output .eh_frame. Handle this special case.
if (this->getSectionHdr()->sh_size == 0)
return Offset;
SectionPiece *Piece = this->getSectionPiece(Offset);
if (Piece->OutputOff == size_t(-1))
return -1; // Not in the output
uintX_t Addend = Offset - Piece->InputOff;
return Piece->OutputOff + Addend;
}
static size_t findNull(ArrayRef<uint8_t> A, size_t EntSize) {
// Optimize the common case.
StringRef S((const char *)A.data(), A.size());
if (EntSize == 1)
return S.find(0);
for (unsigned I = 0, N = S.size(); I != N; I += EntSize) {
const char *B = S.begin() + I;
if (std::all_of(B, B + EntSize, [](char C) { return C == 0; }))
return I;
}
return StringRef::npos;
}
// Split SHF_STRINGS section. Such section is a sequence of
// null-terminated strings.
static std::vector<SectionPiece> splitStrings(ArrayRef<uint8_t> Data,
size_t EntSize) {
std::vector<SectionPiece> V;
size_t Off = 0;
while (!Data.empty()) {
size_t End = findNull(Data, EntSize);
if (End == StringRef::npos)
fatal("string is not null terminated");
size_t Size = End + EntSize;
V.emplace_back(Off, Data.slice(0, Size));
Data = Data.slice(Size);
Off += Size;
}
return V;
}
// Split non-SHF_STRINGS section. Such section is a sequence of
// fixed size records.
static std::vector<SectionPiece> splitNonStrings(ArrayRef<uint8_t> Data,
size_t EntSize) {
std::vector<SectionPiece> V;
size_t Size = Data.size();
assert((Size % EntSize) == 0);
for (unsigned I = 0, N = Size; I != N; I += EntSize)
V.emplace_back(I, Data.slice(I, EntSize));
return V;
}
template <class ELFT>
MergeInputSection<ELFT>::MergeInputSection(elf::ObjectFile<ELFT> *F,
const Elf_Shdr *Header)
: SplitInputSection<ELFT>(F, Header, InputSectionBase<ELFT>::Merge) {}
template <class ELFT> void MergeInputSection<ELFT>::splitIntoPieces() {
ArrayRef<uint8_t> Data = this->getSectionData();
uintX_t EntSize = this->Header->sh_entsize;
if (this->Header->sh_flags & SHF_STRINGS)
this->Pieces = splitStrings(Data, EntSize);
else
this->Pieces = splitNonStrings(Data, EntSize);
if (Config->GcSections)
for (uintX_t Off : LiveOffsets)
this->getSectionPiece(Off)->Live = true;
}
template <class ELFT>
bool MergeInputSection<ELFT>::classof(const InputSectionBase<ELFT> *S) {
return S->SectionKind == InputSectionBase<ELFT>::Merge;
}
// Do binary search to get a section piece at a given input offset.
template <class ELFT>
SectionPiece *SplitInputSection<ELFT>::getSectionPiece(uintX_t Offset) {
ArrayRef<uint8_t> D = this->getSectionData();
StringRef Data((const char *)D.data(), D.size());
uintX_t Size = Data.size();
if (Offset >= Size)
fatal("entry is past the end of the section");
// Find the element this offset points to.
auto I = std::upper_bound(
Pieces.begin(), Pieces.end(), Offset,
[](const uintX_t &A, const SectionPiece &B) { return A < B.InputOff; });
--I;
return &*I;
}
// Returns the offset in an output section for a given input offset.
// Because contents of a mergeable section is not contiguous in output,
// it is not just an addition to a base output offset.
template <class ELFT>
typename ELFT::uint MergeInputSection<ELFT>::getOffset(uintX_t Offset) {
auto It = OffsetMap.find(Offset);
if (It != OffsetMap.end())
return It->second;
// If Offset is not at beginning of a section piece, it is not in the map.
// In that case we need to search from the original section piece vector.
SectionPiece &Piece = *this->getSectionPiece(Offset);
assert(Piece.Live);
uintX_t Addend = Offset - Piece.InputOff;
return Piece.OutputOff + Addend;
}
// Create a map from input offsets to output offsets for all section pieces.
// It is called after finalize().
template <class ELFT> void MergeInputSection<ELFT>::finalizePieces() {
OffsetMap.grow(this->Pieces.size());
for (SectionPiece &Piece : this->Pieces) {
if (!Piece.Live)
continue;
if (Piece.OutputOff == size_t(-1)) {
// Offsets of tail-merged strings are computed lazily.
auto *OutSec = static_cast<MergeOutputSection<ELFT> *>(this->OutSec);
ArrayRef<uint8_t> D = Piece.data();
StringRef S((const char *)D.data(), D.size());
Piece.OutputOff = OutSec->getOffset(S);
}
OffsetMap[Piece.InputOff] = Piece.OutputOff;
}
}
template <class ELFT>
MipsReginfoInputSection<ELFT>::MipsReginfoInputSection(elf::ObjectFile<ELFT> *F,
const Elf_Shdr *Hdr)
: InputSectionBase<ELFT>(F, Hdr, InputSectionBase<ELFT>::MipsReginfo) {
// Initialize this->Reginfo.
ArrayRef<uint8_t> D = this->getSectionData();
if (D.size() != sizeof(Elf_Mips_RegInfo<ELFT>)) {
error("invalid size of .reginfo section");
return;
}
Reginfo = reinterpret_cast<const Elf_Mips_RegInfo<ELFT> *>(D.data());
}
template <class ELFT>
bool MipsReginfoInputSection<ELFT>::classof(const InputSectionBase<ELFT> *S) {
return S->SectionKind == InputSectionBase<ELFT>::MipsReginfo;
}
template <class ELFT>
MipsOptionsInputSection<ELFT>::MipsOptionsInputSection(elf::ObjectFile<ELFT> *F,
const Elf_Shdr *Hdr)
: InputSectionBase<ELFT>(F, Hdr, InputSectionBase<ELFT>::MipsOptions) {
// Find ODK_REGINFO option in the section's content.
ArrayRef<uint8_t> D = this->getSectionData();
while (!D.empty()) {
if (D.size() < sizeof(Elf_Mips_Options<ELFT>)) {
error("invalid size of .MIPS.options section");
break;
}
auto *O = reinterpret_cast<const Elf_Mips_Options<ELFT> *>(D.data());
if (O->kind == ODK_REGINFO) {
Reginfo = &O->getRegInfo();
break;
}
D = D.slice(O->size);
}
}
template <class ELFT>
bool MipsOptionsInputSection<ELFT>::classof(const InputSectionBase<ELFT> *S) {
return S->SectionKind == InputSectionBase<ELFT>::MipsOptions;
}
template class elf::InputSectionBase<ELF32LE>;
template class elf::InputSectionBase<ELF32BE>;
template class elf::InputSectionBase<ELF64LE>;
template class elf::InputSectionBase<ELF64BE>;
template class elf::InputSection<ELF32LE>;
template class elf::InputSection<ELF32BE>;
template class elf::InputSection<ELF64LE>;
template class elf::InputSection<ELF64BE>;
template class elf::SplitInputSection<ELF32LE>;
template class elf::SplitInputSection<ELF32BE>;
template class elf::SplitInputSection<ELF64LE>;
template class elf::SplitInputSection<ELF64BE>;
template class elf::EhInputSection<ELF32LE>;
template class elf::EhInputSection<ELF32BE>;
template class elf::EhInputSection<ELF64LE>;
template class elf::EhInputSection<ELF64BE>;
template class elf::MergeInputSection<ELF32LE>;
template class elf::MergeInputSection<ELF32BE>;
template class elf::MergeInputSection<ELF64LE>;
template class elf::MergeInputSection<ELF64BE>;
template class elf::MipsReginfoInputSection<ELF32LE>;
template class elf::MipsReginfoInputSection<ELF32BE>;
template class elf::MipsReginfoInputSection<ELF64LE>;
template class elf::MipsReginfoInputSection<ELF64BE>;
template class elf::MipsOptionsInputSection<ELF32LE>;
template class elf::MipsOptionsInputSection<ELF32BE>;
template class elf::MipsOptionsInputSection<ELF64LE>;
template class elf::MipsOptionsInputSection<ELF64BE>;
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