Differential D21102 Diff 60279 contrib/llvm/tools/lld/ELF/Relocations.cpp

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contrib/llvm/tools/lld/ELF/Relocations.cpp

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}		}

static bool isAbsoluteValue(const Symbol &Sym) {		static bool isAbsoluteValue(const Symbol &Sym) {
return isAbsolute(Sym) \|\| Sym.isTls();		return isAbsolute(Sym) \|\| Sym.isTls();
}		}

// Returns true if Expr refers a PLT entry.		// Returns true if Expr refers a PLT entry.
static bool needsPlt(RelExpr Expr) {		static bool needsPlt(RelExpr Expr) {
return isRelExprOneOf<R_PLT_PC, R_PPC_CALL_PLT, R_PLT, R_AARCH64_PLT_PAGE_PC,		return isRelExprOneOf<R_PLT_PC, R_PPC_CALL_PLT, R_PLT>(Expr);
R_GOT_PLT, R_AARCH64_GOT_PAGE_PC_PLT>(Expr);
}		}

// Returns true if Expr refers a GOT entry. Note that this function		// Returns true if Expr refers a GOT entry. Note that this function
// returns false for TLS variables even though they need GOT, because		// returns false for TLS variables even though they need GOT, because
// TLS variables uses GOT differently than the regular variables.		// TLS variables uses GOT differently than the regular variables.
static bool needsGot(RelExpr Expr) {		static bool needsGot(RelExpr Expr) {
return isRelExprOneOf<R_GOT, R_GOT_OFF, R_HEXAGON_GOT, R_MIPS_GOT_LOCAL_PAGE,		return isRelExprOneOf<R_GOT, R_GOT_OFF, R_HEXAGON_GOT, R_MIPS_GOT_LOCAL_PAGE,
R_MIPS_GOT_OFF, R_MIPS_GOT_OFF32, R_AARCH64_GOT_PAGE_PC,		R_MIPS_GOT_OFF, R_MIPS_GOT_OFF32, R_AARCH64_GOT_PAGE_PC,
R_AARCH64_GOT_PAGE_PC_PLT, R_GOT_PC, R_GOT_FROM_END,		R_GOT_PC, R_GOT_FROM_END>(Expr);
R_GOT_PLT>(Expr);
}		}

// True if this expression is of the form Sym - X, where X is a position in the		// True if this expression is of the form Sym - X, where X is a position in the
// file (PC, or GOT for example).		// file (PC, or GOT for example).
static bool isRelExpr(RelExpr Expr) {		static bool isRelExpr(RelExpr Expr) {
return isRelExprOneOf<R_PC, R_GOTREL, R_GOTREL_FROM_END, R_MIPS_GOTREL,		return isRelExprOneOf<R_PC, R_GOTREL, R_GOTREL_FROM_END, R_MIPS_GOTREL,
R_PPC_CALL, R_PPC_CALL_PLT, R_AARCH64_PAGE_PC,		R_PPC_CALL, R_PPC_CALL_PLT, R_AARCH64_PAGE_PC,
R_AARCH64_PLT_PAGE_PC, R_RELAX_GOT_PC>(Expr);		R_RELAX_GOT_PC>(Expr);
}		}

// Returns true if a given relocation can be computed at link-time.		// Returns true if a given relocation can be computed at link-time.
//		//
// For instance, we know the offset from a relocation to its target at		// For instance, we know the offset from a relocation to its target at
// link-time if the relocation is PC-relative and refers a		// link-time if the relocation is PC-relative and refers a
// non-interposable function in the same executable. This function		// non-interposable function in the same executable. This function
// will return true for such relocation.		// will return true for such relocation.
//		//
// If this function returns false, that means we need to emit a		// If this function returns false, that means we need to emit a
// dynamic relocation so that the relocation will be fixed at load-time.		// dynamic relocation so that the relocation will be fixed at load-time.
static bool isStaticLinkTimeConstant(RelExpr E, RelType Type, const Symbol &Sym,		static bool isStaticLinkTimeConstant(RelExpr E, RelType Type, const Symbol &Sym,
InputSectionBase &S, uint64_t RelOff) {		InputSectionBase &S, uint64_t RelOff) {
// These expressions always compute a constant		// These expressions always compute a constant
if (isRelExprOneOf<R_GOT_FROM_END, R_GOT_OFF, R_HEXAGON_GOT, R_TLSLD_GOT_OFF,		if (isRelExprOneOf<R_GOT_FROM_END, R_GOT_OFF, R_HEXAGON_GOT, R_TLSLD_GOT_OFF,
R_MIPS_GOT_LOCAL_PAGE, R_MIPS_GOTREL, R_MIPS_GOT_OFF,		R_MIPS_GOT_LOCAL_PAGE, R_MIPS_GOTREL, R_MIPS_GOT_OFF,
R_MIPS_GOT_OFF32, R_MIPS_GOT_GP_PC, R_MIPS_TLSGD,		R_MIPS_GOT_OFF32, R_MIPS_GOT_GP_PC, R_MIPS_TLSGD,
R_AARCH64_GOT_PAGE_PC, R_AARCH64_GOT_PAGE_PC_PLT, R_GOT_PC,		R_AARCH64_GOT_PAGE_PC, R_GOT_PC, R_GOTONLY_PC,
R_GOTONLY_PC, R_GOTONLY_PC_FROM_END, R_PLT_PC, R_TLSGD_GOT,		R_GOTONLY_PC_FROM_END, R_PLT_PC, R_TLSGD_GOT,
R_TLSGD_GOT_FROM_END, R_TLSGD_PC, R_PPC_CALL_PLT,		R_TLSGD_GOT_FROM_END, R_TLSGD_PC, R_PPC_CALL_PLT,
R_TLSDESC_CALL, R_AARCH64_TLSDESC_PAGE, R_HINT,		R_TLSDESC_CALL, R_AARCH64_TLSDESC_PAGE, R_HINT,
R_TLSLD_HINT, R_TLSIE_HINT>(E))		R_TLSLD_HINT, R_TLSIE_HINT>(E))
return true;		return true;

// The computation involves output from the ifunc resolver.		// The computation involves output from the ifunc resolver.
if (Sym.isGnuIFunc() && Config->ZIfuncnoplt)		if (Sym.isGnuIFunc() && Config->ZIfuncnoplt)
return false;		return false;

// These never do, except if the entire file is position dependent or if		// These never do, except if the entire file is position dependent or if
// only the low bits are used.		// only the low bits are used.
if (E == R_GOT \|\| E == R_GOT_PLT \|\| E == R_PLT \|\| E == R_TLSDESC)		if (E == R_GOT \|\| E == R_PLT \|\| E == R_TLSDESC)
return Target->usesOnlyLowPageBits(Type) \|\| !Config->Pic;		return Target->usesOnlyLowPageBits(Type) \|\| !Config->Pic;

if (Sym.IsPreemptible)		if (Sym.IsPreemptible)
return false;		return false;
if (!Config->Pic)		if (!Config->Pic)
return true;		return true;

// The size of a non preemptible symbol is a constant.		// The size of a non preemptible symbol is a constant.
Show All 29 Lines
}		}

static RelExpr toPlt(RelExpr Expr) {		static RelExpr toPlt(RelExpr Expr) {
switch (Expr) {		switch (Expr) {
case R_PPC_CALL:		case R_PPC_CALL:
return R_PPC_CALL_PLT;		return R_PPC_CALL_PLT;
case R_PC:		case R_PC:
return R_PLT_PC;		return R_PLT_PC;
case R_AARCH64_PAGE_PC:
return R_AARCH64_PLT_PAGE_PC;
case R_AARCH64_GOT_PAGE_PC:
return R_AARCH64_GOT_PAGE_PC_PLT;
case R_ABS:		case R_ABS:
return R_PLT;		return R_PLT;
case R_GOT:
return R_GOT_PLT;
default:		default:
return Expr;		return Expr;
}		}
}		}

static RelExpr fromPlt(RelExpr Expr) {		static RelExpr fromPlt(RelExpr Expr) {
// We decided not to use a plt. Optimize a reference to the plt to a		// We decided not to use a plt. Optimize a reference to the plt to a
// reference to the symbol itself.		// reference to the symbol itself.
▲ Show 20 Lines • Show All 315 Lines • ▼ Show 20 Lines	static void addPltEntry(PltSection Plt, GotPltSection GotPlt,
GotPlt->addEntry(Sym);		GotPlt->addEntry(Sym);
Rel->addReloc(		Rel->addReloc(
{Type, GotPlt, Sym.getGotPltOffset(), !Sym.IsPreemptible, &Sym, 0});		{Type, GotPlt, Sym.getGotPltOffset(), !Sym.IsPreemptible, &Sym, 0});
}		}

template <class ELFT> static void addGotEntry(Symbol &Sym) {		template <class ELFT> static void addGotEntry(Symbol &Sym) {
In.Got->addEntry(Sym);		In.Got->addEntry(Sym);

RelExpr Expr;		RelExpr Expr = Sym.isTls() ? R_TLS : R_ABS;
if (Sym.isTls())
Expr = R_TLS;
else if (Sym.isGnuIFunc())
Expr = R_PLT;
else
Expr = R_ABS;

uint64_t Off = Sym.getGotOffset();		uint64_t Off = Sym.getGotOffset();

// If a GOT slot value can be calculated at link-time, which is now,		// If a GOT slot value can be calculated at link-time, which is now,
// we can just fill that out.		// we can just fill that out.
//		//
// (We don't actually write a value to a GOT slot right now, but we		// (We don't actually write a value to a GOT slot right now, but we
// add a static relocation to a Relocations vector so that		// add a static relocation to a Relocations vector so that
// InputSection::relocate will do the work for us. We may be able		// InputSection::relocate will do the work for us. We may be able
▲ Show 20 Lines • Show All 182 Lines • ▼ Show 20 Lines	if (Sym.isFunc()) {
Sec.Relocations.push_back({Expr, Type, Offset, Addend, &Sym});		Sec.Relocations.push_back({Expr, Type, Offset, Addend, &Sym});
return;		return;
}		}

errorOrWarn("symbol '" + toString(Sym) + "' has no type" +		errorOrWarn("symbol '" + toString(Sym) + "' has no type" +
getLocation(Sec, Sym, Offset));		getLocation(Sec, Sym, Offset));
}		}

		struct IRelativeReloc {
		RelType Type;
		InputSectionBase *Sec;
		uint64_t Offset;
		Symbol *Sym;
		};

		static std::vector<IRelativeReloc> IRelativeRelocs;

template <class ELFT, class RelTy>		template <class ELFT, class RelTy>
static void scanReloc(InputSectionBase &Sec, OffsetGetter &GetOffset, RelTy *&I,		static void scanReloc(InputSectionBase &Sec, OffsetGetter &GetOffset, RelTy *&I,
RelTy *End) {		RelTy *End) {
const RelTy &Rel = *I;		const RelTy &Rel = *I;
Symbol &Sym = Sec.getFile<ELFT>()->getRelocTargetSym(Rel);		Symbol &Sym = Sec.getFile<ELFT>()->getRelocTargetSym(Rel);
RelType Type;		RelType Type;

// Deal with MIPS oddity.		// Deal with MIPS oddity.
Show All 15 Lines	static void scanReloc(InputSectionBase &Sec, OffsetGetter &GetOffset, RelTy *&I,

const uint8_t *RelocatedAddr = Sec.data().begin() + Rel.r_offset;		const uint8_t *RelocatedAddr = Sec.data().begin() + Rel.r_offset;
RelExpr Expr = Target->getRelExpr(Type, Sym, RelocatedAddr);		RelExpr Expr = Target->getRelExpr(Type, Sym, RelocatedAddr);

// Ignore "hint" relocations because they are only markers for relaxation.		// Ignore "hint" relocations because they are only markers for relaxation.
if (isRelExprOneOf<R_HINT, R_NONE>(Expr))		if (isRelExprOneOf<R_HINT, R_NONE>(Expr))
return;		return;

// Strenghten or relax relocations.		if (Sym.isGnuIFunc() && !Config->ZText && Config->WarnIfuncTextrel) {
//
// GNU ifunc symbols must be accessed via PLT because their addresses
// are determined by runtime.
//
// On the other hand, if we know that a PLT entry will be resolved within
// the same ELF module, we can skip PLT access and directly jump to the
// destination function. For example, if we are linking a main exectuable,
// all dynamic symbols that can be resolved within the executable will
// actually be resolved that way at runtime, because the main exectuable
// is always at the beginning of a search list. We can leverage that fact.
if (Sym.isGnuIFunc() && !Config->ZIfuncnoplt) {
if (!Config->ZText && Config->WarnIfuncTextrel) {
warn("using ifunc symbols when text relocations are allowed may produce "		warn("using ifunc symbols when text relocations are allowed may produce "
		luporlAuthorUnsubmitted Done Inline Actions Add missing "!Config->ZIfuncnoplt" condition. luporl: Add missing "!Config->ZIfuncnoplt" condition.
		markjUnsubmitted Done Inline Actions I don't think we need to keep that piece of the diff. The warning is only printed if the warning flag is set, and I think it's a legitimate warning in most cases. markj: I don't think we need to keep that piece of the diff. The warning is only printed if the…
"a binary that will segfault, if the object file is linked with "		"a binary that will segfault, if the object file is linked with "
"old version of glibc (glibc 2.28 and earlier). If this applies to "		"old version of glibc (glibc 2.28 and earlier). If this applies to "
"you, consider recompiling the object files without -fPIC and "		"you, consider recompiling the object files without -fPIC and "
"without -Wl,-z,notext option. Use -no-warn-ifunc-textrel to "		"without -Wl,-z,notext option. Use -no-warn-ifunc-textrel to "
"turn off this warning." +		"turn off this warning." +
getLocation(Sec, Sym, Offset));		getLocation(Sec, Sym, Offset));
}		}
Expr = toPlt(Expr);
} else if (!Sym.IsPreemptible && Expr == R_GOT_PC && !isAbsoluteValue(Sym)) {		// Relax relocations.
		//
		// If we know that a PLT entry will be resolved within the same ELF module, we
		// can skip PLT access and directly jump to the destination function. For
		// example, if we are linking a main exectuable, all dynamic symbols that can
		// be resolved within the executable will actually be resolved that way at
		// runtime, because the main exectuable is always at the beginning of a search
		// list. We can leverage that fact.
		if (!Sym.IsPreemptible && (!Sym.isGnuIFunc() \|\| Config->ZIfuncnoplt)) {
		if (Expr == R_GOT_PC && !isAbsoluteValue(Sym))
Expr = Target->adjustRelaxExpr(Type, RelocatedAddr, Expr);		Expr = Target->adjustRelaxExpr(Type, RelocatedAddr, Expr);
} else if (!Sym.IsPreemptible) {		else
Expr = fromPlt(Expr);		Expr = fromPlt(Expr);
}		}

// This relocation does not require got entry, but it is relative to got and		// This relocation does not require got entry, but it is relative to got and
// needs it to be created. Here we request for that.		// needs it to be created. Here we request for that.
if (isRelExprOneOf<R_GOTONLY_PC, R_GOTONLY_PC_FROM_END, R_GOTREL,		if (isRelExprOneOf<R_GOTONLY_PC, R_GOTONLY_PC_FROM_END, R_GOTREL,
R_GOTREL_FROM_END, R_PPC_TOC>(Expr))		R_GOTREL_FROM_END, R_PPC_TOC>(Expr))
In.Got->HasGotOffRel = true;		In.Got->HasGotOffRel = true;

// Read an addend.		// Read an addend.
int64_t Addend = computeAddend<ELFT>(Rel, End, Sec, Expr, Sym.isLocal());		int64_t Addend = computeAddend<ELFT>(Rel, End, Sec, Expr, Sym.isLocal());

// Process some TLS relocations, including relaxing TLS relocations.		// Process some TLS relocations, including relaxing TLS relocations.
// Note that this function does not handle all TLS relocations.		// Note that this function does not handle all TLS relocations.
if (unsigned Processed =		if (unsigned Processed =
handleTlsRelocation<ELFT>(Type, Sym, Sec, Offset, Addend, Expr)) {		handleTlsRelocation<ELFT>(Type, Sym, Sec, Offset, Addend, Expr)) {
I += (Processed - 1);		I += (Processed - 1);
return;		return;
}		}

		// Non-preemptible ifuncs require special handling. First, handle the usual
		// case where the symbol isn't one of these.
		if (!Sym.isGnuIFunc() \|\| Sym.IsPreemptible) {
// If a relocation needs PLT, we create PLT and GOTPLT slots for the symbol.		// If a relocation needs PLT, we create PLT and GOTPLT slots for the symbol.
if (needsPlt(Expr) && !Sym.isInPlt()) {		if (needsPlt(Expr) && !Sym.isInPlt())
if (Sym.isGnuIFunc() && !Sym.IsPreemptible)
addPltEntry<ELFT>(In.Iplt, In.IgotPlt, In.RelaIplt, Target->IRelativeRel,
Sym);
else
addPltEntry<ELFT>(In.Plt, In.GotPlt, In.RelaPlt, Target->PltRel, Sym);		addPltEntry<ELFT>(In.Plt, In.GotPlt, In.RelaPlt, Target->PltRel, Sym);
}

// Create a GOT slot if a relocation needs GOT.		// Create a GOT slot if a relocation needs GOT.
if (needsGot(Expr)) {		if (needsGot(Expr)) {
if (Config->EMachine == EM_MIPS) {		if (Config->EMachine == EM_MIPS) {
// MIPS ABI has special rules to process GOT entries and doesn't		// MIPS ABI has special rules to process GOT entries and doesn't
// require relocation entries for them. A special case is TLS		// require relocation entries for them. A special case is TLS
// relocations. In that case dynamic loader applies dynamic		// relocations. In that case dynamic loader applies dynamic
// relocations to initialize TLS GOT entries.		// relocations to initialize TLS GOT entries.
// See "Global Offset Table" in Chapter 5 in the following document		// See "Global Offset Table" in Chapter 5 in the following document
// for detailed description:		// for detailed description:
// ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf		// ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf
In.MipsGot->addEntry(*Sec.File, Sym, Addend, Expr);		In.MipsGot->addEntry(*Sec.File, Sym, Addend, Expr);
} else if (!Sym.isInGot()) {		} else if (!Sym.isInGot()) {
addGotEntry<ELFT>(Sym);		addGotEntry<ELFT>(Sym);
}		}
}		}
		} else {
		// Handle a reference to a non-preemptible ifunc. These are special in a
		// few ways:
		//
		// - Unlike most non-preemptible symbols, non-preemptible ifuncs do not have
		// a fixed value. But assuming that all references to the ifunc are
		// GOT-generating or PLT-generating, the handling of an ifunc is
		// relatively straightforward. We create a PLT entry in Iplt, which is
		// usually at the end of .plt, which makes an indirect call using a
		// matching GOT entry in IgotPlt, which is usually at the end of .got.plt.
		// The GOT entry is relocated using an IRELATIVE relocation in RelaIplt,
		// which is usually at the end of .rela.plt. Unlike most relocations in
		// .rela.plt, which may be evaluated lazily without -z now, dynamic
		// loaders evaluate IRELATIVE relocs eagerly, which means that for
		// IRELATIVE relocs only, GOT-generating relocations can point directly to
		// .got.plt without requiring a separate GOT entry.
		//
		// - Despite the fact that an ifunc does not have a fixed value, compilers
		// that are not passed -fPIC will assume that they do, and will emit
		// direct (non-GOT-generating, non-PLT-generating) relocations to the
		// symbol. This means that if a direct relocation to the symbol is
		// seen, the linker must set a value for the symbol, and this value must
		// be consistent no matter what type of reference is made to the symbol.
		// This can be done by creating a PLT entry for the symbol in the way
		// described above and making it canonical, that is, making all references
		// point to the PLT entry instead of the resolver. In lld we also store
		// the address of the PLT entry in the dynamic symbol table, which means
		// that the symbol will also have the same value in other modules.
		// Because the value loaded from the GOT needs to be consistent with
		// the value computed using a direct relocation, a non-preemptible ifunc
		// may end up with two GOT entries, one in .got.plt that points to the
		// address returned by the resolver and is used only by the PLT entry,
		// and another in .got that points to the PLT entry and is used by
		// GOT-generating relocations.
		//
		// - The fact that these symbols do not have a fixed value makes them an
		// exception to the general rule that a statically linked executable does
		// not require any form of dynamic relocation. To handle these relocations
		// correctly, the IRELATIVE relocations are stored in an array which a
		// statically linked executable's startup code must enumerate using the
		// linker-defined symbols __rela?_iplt_{start,end}.
		//
		// - An absolute relocation to a non-preemptible ifunc (such as a global
		// variable containing a pointer to the ifunc) needs to be relocated in
		// the exact same way as a GOT entry, so we can avoid needing to make the
		// PLT entry canonical by translating such relocations into IRELATIVE
		// relocations in the RelaIplt.
		if (!Sym.isInPlt()) {
		// Create PLT and GOTPLT slots for the symbol.
		Sym.IsInIplt = true;

		// Create a copy of the symbol to use as the target of the IRELATIVE
		// relocation in the IgotPlt. This is in case we make the PLT canonical
		// later, which would overwrite the original symbol.
		//
		// FIXME: Creating a copy of the symbol here is a bit of a hack. All
		// that's really needed to create the IRELATIVE is the section and value,
		// so ideally we should just need to copy those.
		auto *DirectSym = make<Defined>(cast<Defined>(Sym));
		addPltEntry<ELFT>(In.Iplt, In.IgotPlt, In.RelaIplt, Target->IRelativeRel,
		*DirectSym);
		Sym.PltIndex = DirectSym->PltIndex;
		}
		if (Expr == R_ABS && Addend == 0 && (Sec.Flags & SHF_WRITE)) {
		// We might be able to represent this as an IRELATIVE. But we don't know
		// yet whether some later relocation will make the symbol point to a
		// canonical PLT, which would make this either a dynamic RELATIVE (PIC) or
		// static (non-PIC) relocation. So we keep a record of the information
		// required to process the relocation, and after scanRelocs() has been
		// called on all relocations, the relocation is resolved by
		// addIRelativeRelocs().
		IRelativeRelocs.push_back({Type, &Sec, Offset, &Sym});
		return;
		}
		if (needsGot(Expr)) {
		// Redirect GOT accesses to point to the Igot.
		//
		// This field is also used to keep track of whether we ever needed a GOT
		// entry. If we did and we make the PLT canonical later, we'll need to
		// create a GOT entry pointing to the PLT entry for Sym.
		Sym.GotInIgot = true;
		} else if (!needsPlt(Expr)) {
		// Make the ifunc's PLT entry canonical by changing the value of its
		// symbol to redirect all references to point to it.
		unsigned EntryOffset = Sym.PltIndex * Target->PltEntrySize;
		if (Config->ZRetpolineplt)
		EntryOffset += Target->PltHeaderSize;

		auto &D = cast<Defined>(Sym);
		D.Section = In.Iplt;
		D.Value = EntryOffset;
		D.Size = 0;
		// It's important to set the symbol type here so that dynamic loaders
		// don't try to call the PLT as if it were an ifunc resolver.
		D.Type = STT_FUNC;

		if (Sym.GotInIgot) {
		// We previously encountered a GOT generating reference that we
		// redirected to the Igot. Now that the PLT entry is canonical we must
		// clear the redirection to the Igot and add a GOT entry. As we've
		// changed the symbol type to STT_FUNC future GOT generating references
		// will naturally use this GOT entry.
		//
		// We don't need to worry about creating a MIPS GOT here because ifuncs
		// aren't a thing on MIPS.
		Sym.GotInIgot = false;
		addGotEntry<ELFT>(Sym);
		}
		}
		}

processRelocAux<ELFT>(Sec, Expr, Type, Offset, Sym, Rel, Addend);		processRelocAux<ELFT>(Sec, Expr, Type, Offset, Sym, Rel, Addend);
}		}

template <class ELFT, class RelTy>		template <class ELFT, class RelTy>
static void scanRelocs(InputSectionBase &Sec, ArrayRef<RelTy> Rels) {		static void scanRelocs(InputSectionBase &Sec, ArrayRef<RelTy> Rels) {
OffsetGetter GetOffset(Sec);		OffsetGetter GetOffset(Sec);

// Not all relocations end up in Sec.Relocations, but a lot do.		// Not all relocations end up in Sec.Relocations, but a lot do.
Sec.Relocations.reserve(Rels.size());		Sec.Relocations.reserve(Rels.size());

for (auto I = Rels.begin(), End = Rels.end(); I != End;)		for (auto I = Rels.begin(), End = Rels.end(); I != End;)
scanReloc<ELFT>(Sec, GetOffset, I, End);		scanReloc<ELFT>(Sec, GetOffset, I, End);

// Sort relocations by offset to binary search for R_RISCV_PCREL_HI20		// Sort relocations by offset to binary search for R_RISCV_PCREL_HI20
if (Config->EMachine == EM_RISCV)		if (Config->EMachine == EM_RISCV)
std::stable_sort(Sec.Relocations.begin(), Sec.Relocations.end(),		std::stable_sort(Sec.Relocations.begin(), Sec.Relocations.end(),
RelocationOffsetComparator{});		RelocationOffsetComparator{});
}		}

template <class ELFT> void elf::scanRelocations(InputSectionBase &S) {		template <class ELFT> void elf::scanRelocations(InputSectionBase &S) {
if (S.AreRelocsRela)		if (S.AreRelocsRela)
scanRelocs<ELFT>(S, S.relas<ELFT>());		scanRelocs<ELFT>(S, S.relas<ELFT>());
else		else
scanRelocs<ELFT>(S, S.rels<ELFT>());		scanRelocs<ELFT>(S, S.rels<ELFT>());
		}

		// Figure out which representation to use for any absolute relocs to
		// non-preemptible ifuncs that we visited during scanRelocs().
		void elf::addIRelativeRelocs() {
		for (IRelativeReloc &R : IRelativeRelocs) {
		if (R.Sym->Type == STT_GNU_IFUNC)
		In.RelaIplt->addReloc(
		{Target->IRelativeRel, R.Sec, R.Offset, true, R.Sym, 0});
		else if (Config->Pic)
		addRelativeReloc(R.Sec, R.Offset, R.Sym, 0, R_ABS, R.Type);
		else
		R.Sec->Relocations.push_back({R_ABS, R.Type, R.Offset, 0, R.Sym});
		}
		IRelativeRelocs.clear();
}		}

static bool mergeCmp(const InputSection A, const InputSection B) {		static bool mergeCmp(const InputSection A, const InputSection B) {
// std::merge requires a strict weak ordering.		// std::merge requires a strict weak ordering.
if (A->OutSecOff < B->OutSecOff)		if (A->OutSecOff < B->OutSecOff)
return true;		return true;

if (A->OutSecOff == B->OutSecOff) {		if (A->OutSecOff == B->OutSecOff) {
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