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llvm-project/llvm/lib/Object/ELFObjectFile.cpp
Reid Kleckner 89b57061f7 Move TargetRegistry.(h|cpp) from Support to MC 
This moves the registry higher in the LLVM library dependency stack.
Every client of the target registry needs to link against MC anyway to
actually use the target, so we might as well move this out of Support.

This allows us to ensure that Support doesn't have includes from MC/*.

Differential Revision: https://reviews.llvm.org/D111454
2021-10-08 14:51:48 -07:00

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//===- ELFObjectFile.cpp - ELF object file implementation -----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Part of the ELFObjectFile class implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/ADT/Triple.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Object/ELF.h"
#include "llvm/Object/ELFTypes.h"
#include "llvm/Object/Error.h"
#include "llvm/Support/ARMAttributeParser.h"
#include "llvm/Support/ARMBuildAttributes.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/RISCVAttributeParser.h"
#include "llvm/Support/RISCVAttributes.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <string>
#include <system_error>
#include <utility>
using namespace llvm;
using namespace object;
const EnumEntry<unsigned> llvm::object::ElfSymbolTypes[NumElfSymbolTypes] = {
{"None", "NOTYPE", ELF::STT_NOTYPE},
{"Object", "OBJECT", ELF::STT_OBJECT},
{"Function", "FUNC", ELF::STT_FUNC},
{"Section", "SECTION", ELF::STT_SECTION},
{"File", "FILE", ELF::STT_FILE},
{"Common", "COMMON", ELF::STT_COMMON},
{"TLS", "TLS", ELF::STT_TLS},
{"Unknown", "<unknown>: 7", 7},
{"Unknown", "<unknown>: 8", 8},
{"Unknown", "<unknown>: 9", 9},
{"GNU_IFunc", "IFUNC", ELF::STT_GNU_IFUNC},
{"OS Specific", "<OS specific>: 11", 11},
{"OS Specific", "<OS specific>: 12", 12},
{"Proc Specific", "<processor specific>: 13", 13},
{"Proc Specific", "<processor specific>: 14", 14},
{"Proc Specific", "<processor specific>: 15", 15}
};
ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source)
: ObjectFile(Type, Source) {}
template <class ELFT>
static Expected<std::unique_ptr<ELFObjectFile<ELFT>>>
createPtr(MemoryBufferRef Object, bool InitContent) {
auto Ret = ELFObjectFile<ELFT>::create(Object, InitContent);
if (Error E = Ret.takeError())
return std::move(E);
return std::make_unique<ELFObjectFile<ELFT>>(std::move(*Ret));
}
Expected<std::unique_ptr<ObjectFile>>
ObjectFile::createELFObjectFile(MemoryBufferRef Obj, bool InitContent) {
std::pair<unsigned char, unsigned char> Ident =
getElfArchType(Obj.getBuffer());
std::size_t MaxAlignment =
1ULL << countTrailingZeros(
reinterpret_cast<uintptr_t>(Obj.getBufferStart()));
if (MaxAlignment < 2)
return createError("Insufficient alignment");
if (Ident.first == ELF::ELFCLASS32) {
if (Ident.second == ELF::ELFDATA2LSB)
return createPtr<ELF32LE>(Obj, InitContent);
else if (Ident.second == ELF::ELFDATA2MSB)
return createPtr<ELF32BE>(Obj, InitContent);
else
return createError("Invalid ELF data");
} else if (Ident.first == ELF::ELFCLASS64) {
if (Ident.second == ELF::ELFDATA2LSB)
return createPtr<ELF64LE>(Obj, InitContent);
else if (Ident.second == ELF::ELFDATA2MSB)
return createPtr<ELF64BE>(Obj, InitContent);
else
return createError("Invalid ELF data");
}
return createError("Invalid ELF class");
}
SubtargetFeatures ELFObjectFileBase::getMIPSFeatures() const {
SubtargetFeatures Features;
unsigned PlatformFlags = getPlatformFlags();
switch (PlatformFlags & ELF::EF_MIPS_ARCH) {
case ELF::EF_MIPS_ARCH_1:
break;
case ELF::EF_MIPS_ARCH_2:
Features.AddFeature("mips2");
break;
case ELF::EF_MIPS_ARCH_3:
Features.AddFeature("mips3");
break;
case ELF::EF_MIPS_ARCH_4:
Features.AddFeature("mips4");
break;
case ELF::EF_MIPS_ARCH_5:
Features.AddFeature("mips5");
break;
case ELF::EF_MIPS_ARCH_32:
Features.AddFeature("mips32");
break;
case ELF::EF_MIPS_ARCH_64:
Features.AddFeature("mips64");
break;
case ELF::EF_MIPS_ARCH_32R2:
Features.AddFeature("mips32r2");
break;
case ELF::EF_MIPS_ARCH_64R2:
Features.AddFeature("mips64r2");
break;
case ELF::EF_MIPS_ARCH_32R6:
Features.AddFeature("mips32r6");
break;
case ELF::EF_MIPS_ARCH_64R6:
Features.AddFeature("mips64r6");
break;
default:
llvm_unreachable("Unknown EF_MIPS_ARCH value");
}
switch (PlatformFlags & ELF::EF_MIPS_MACH) {
case ELF::EF_MIPS_MACH_NONE:
// No feature associated with this value.
break;
case ELF::EF_MIPS_MACH_OCTEON:
Features.AddFeature("cnmips");
break;
default:
llvm_unreachable("Unknown EF_MIPS_ARCH value");
}
if (PlatformFlags & ELF::EF_MIPS_ARCH_ASE_M16)
Features.AddFeature("mips16");
if (PlatformFlags & ELF::EF_MIPS_MICROMIPS)
Features.AddFeature("micromips");
return Features;
}
SubtargetFeatures ELFObjectFileBase::getARMFeatures() const {
SubtargetFeatures Features;
ARMAttributeParser Attributes;
if (Error E = getBuildAttributes(Attributes)) {
consumeError(std::move(E));
return SubtargetFeatures();
}
// both ARMv7-M and R have to support thumb hardware div
bool isV7 = false;
Optional<unsigned> Attr =
Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch);
if (Attr.hasValue())
isV7 = Attr.getValue() == ARMBuildAttrs::v7;
Attr = Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch_profile);
if (Attr.hasValue()) {
switch (Attr.getValue()) {
case ARMBuildAttrs::ApplicationProfile:
Features.AddFeature("aclass");
break;
case ARMBuildAttrs::RealTimeProfile:
Features.AddFeature("rclass");
if (isV7)
Features.AddFeature("hwdiv");
break;
case ARMBuildAttrs::MicroControllerProfile:
Features.AddFeature("mclass");
if (isV7)
Features.AddFeature("hwdiv");
break;
}
}
Attr = Attributes.getAttributeValue(ARMBuildAttrs::THUMB_ISA_use);
if (Attr.hasValue()) {
switch (Attr.getValue()) {
default:
break;
case ARMBuildAttrs::Not_Allowed:
Features.AddFeature("thumb", false);
Features.AddFeature("thumb2", false);
break;
case ARMBuildAttrs::AllowThumb32:
Features.AddFeature("thumb2");
break;
}
}
Attr = Attributes.getAttributeValue(ARMBuildAttrs::FP_arch);
if (Attr.hasValue()) {
switch (Attr.getValue()) {
default:
break;
case ARMBuildAttrs::Not_Allowed:
Features.AddFeature("vfp2sp", false);
Features.AddFeature("vfp3d16sp", false);
Features.AddFeature("vfp4d16sp", false);
break;
case ARMBuildAttrs::AllowFPv2:
Features.AddFeature("vfp2");
break;
case ARMBuildAttrs::AllowFPv3A:
case ARMBuildAttrs::AllowFPv3B:
Features.AddFeature("vfp3");
break;
case ARMBuildAttrs::AllowFPv4A:
case ARMBuildAttrs::AllowFPv4B:
Features.AddFeature("vfp4");
break;
}
}
Attr = Attributes.getAttributeValue(ARMBuildAttrs::Advanced_SIMD_arch);
if (Attr.hasValue()) {
switch (Attr.getValue()) {
default:
break;
case ARMBuildAttrs::Not_Allowed:
Features.AddFeature("neon", false);
Features.AddFeature("fp16", false);
break;
case ARMBuildAttrs::AllowNeon:
Features.AddFeature("neon");
break;
case ARMBuildAttrs::AllowNeon2:
Features.AddFeature("neon");
Features.AddFeature("fp16");
break;
}
}
Attr = Attributes.getAttributeValue(ARMBuildAttrs::MVE_arch);
if (Attr.hasValue()) {
switch (Attr.getValue()) {
default:
break;
case ARMBuildAttrs::Not_Allowed:
Features.AddFeature("mve", false);
Features.AddFeature("mve.fp", false);
break;
case ARMBuildAttrs::AllowMVEInteger:
Features.AddFeature("mve.fp", false);
Features.AddFeature("mve");
break;
case ARMBuildAttrs::AllowMVEIntegerAndFloat:
Features.AddFeature("mve.fp");
break;
}
}
Attr = Attributes.getAttributeValue(ARMBuildAttrs::DIV_use);
if (Attr.hasValue()) {
switch (Attr.getValue()) {
default:
break;
case ARMBuildAttrs::DisallowDIV:
Features.AddFeature("hwdiv", false);
Features.AddFeature("hwdiv-arm", false);
break;
case ARMBuildAttrs::AllowDIVExt:
Features.AddFeature("hwdiv");
Features.AddFeature("hwdiv-arm");
break;
}
}
return Features;
}
SubtargetFeatures ELFObjectFileBase::getRISCVFeatures() const {
SubtargetFeatures Features;
unsigned PlatformFlags = getPlatformFlags();
if (PlatformFlags & ELF::EF_RISCV_RVC) {
Features.AddFeature("c");
}
// Add features according to the ELF attribute section.
// If there are any unrecognized features, ignore them.
RISCVAttributeParser Attributes;
if (Error E = getBuildAttributes(Attributes)) {
// TODO Propagate Error.
consumeError(std::move(E));
return Features; // Keep "c" feature if there is one in PlatformFlags.
}
Optional<StringRef> Attr = Attributes.getAttributeString(RISCVAttrs::ARCH);
if (Attr.hasValue()) {
// The Arch pattern is [rv32|rv64][i|e]version(_[m|a|f|d|c]version)*
// Version string pattern is (major)p(minor). Major and minor are optional.
// For example, a version number could be 2p0, 2, or p92.
StringRef Arch = Attr.getValue();
if (Arch.consume_front("rv32"))
Features.AddFeature("64bit", false);
else if (Arch.consume_front("rv64"))
Features.AddFeature("64bit");
while (!Arch.empty()) {
switch (Arch[0]) {
default:
break; // Ignore unexpected features.
case 'i':
Features.AddFeature("e", false);
break;
case 'd':
Features.AddFeature("f"); // D-ext will imply F-ext.
LLVM_FALLTHROUGH;
case 'e':
case 'm':
case 'a':
case 'f':
case 'c':
Features.AddFeature(Arch.take_front());
break;
}
// FIXME: Handle version numbers.
Arch = Arch.drop_until([](char c) { return c == '_' || c == '\0'; });
Arch = Arch.drop_while([](char c) { return c == '_'; });
}
}
return Features;
}
SubtargetFeatures ELFObjectFileBase::getFeatures() const {
switch (getEMachine()) {
case ELF::EM_MIPS:
return getMIPSFeatures();
case ELF::EM_ARM:
return getARMFeatures();
case ELF::EM_RISCV:
return getRISCVFeatures();
default:
return SubtargetFeatures();
}
}
Optional<StringRef> ELFObjectFileBase::tryGetCPUName() const {
switch (getEMachine()) {
case ELF::EM_AMDGPU:
return getAMDGPUCPUName();
default:
return None;
}
}
StringRef ELFObjectFileBase::getAMDGPUCPUName() const {
assert(getEMachine() == ELF::EM_AMDGPU);
unsigned CPU = getPlatformFlags() & ELF::EF_AMDGPU_MACH;
switch (CPU) {
// Radeon HD 2000/3000 Series (R600).
case ELF::EF_AMDGPU_MACH_R600_R600:
return "r600";
case ELF::EF_AMDGPU_MACH_R600_R630:
return "r630";
case ELF::EF_AMDGPU_MACH_R600_RS880:
return "rs880";
case ELF::EF_AMDGPU_MACH_R600_RV670:
return "rv670";
// Radeon HD 4000 Series (R700).
case ELF::EF_AMDGPU_MACH_R600_RV710:
return "rv710";
case ELF::EF_AMDGPU_MACH_R600_RV730:
return "rv730";
case ELF::EF_AMDGPU_MACH_R600_RV770:
return "rv770";
// Radeon HD 5000 Series (Evergreen).
case ELF::EF_AMDGPU_MACH_R600_CEDAR:
return "cedar";
case ELF::EF_AMDGPU_MACH_R600_CYPRESS:
return "cypress";
case ELF::EF_AMDGPU_MACH_R600_JUNIPER:
return "juniper";
case ELF::EF_AMDGPU_MACH_R600_REDWOOD:
return "redwood";
case ELF::EF_AMDGPU_MACH_R600_SUMO:
return "sumo";
// Radeon HD 6000 Series (Northern Islands).
case ELF::EF_AMDGPU_MACH_R600_BARTS:
return "barts";
case ELF::EF_AMDGPU_MACH_R600_CAICOS:
return "caicos";
case ELF::EF_AMDGPU_MACH_R600_CAYMAN:
return "cayman";
case ELF::EF_AMDGPU_MACH_R600_TURKS:
return "turks";
// AMDGCN GFX6.
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX600:
return "gfx600";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX601:
return "gfx601";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX602:
return "gfx602";
// AMDGCN GFX7.
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX700:
return "gfx700";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX701:
return "gfx701";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX702:
return "gfx702";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX703:
return "gfx703";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX704:
return "gfx704";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX705:
return "gfx705";
// AMDGCN GFX8.
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX801:
return "gfx801";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX802:
return "gfx802";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX803:
return "gfx803";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX805:
return "gfx805";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX810:
return "gfx810";
// AMDGCN GFX9.
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX900:
return "gfx900";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX902:
return "gfx902";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX904:
return "gfx904";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX906:
return "gfx906";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX908:
return "gfx908";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX909:
return "gfx909";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX90A:
return "gfx90a";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX90C:
return "gfx90c";
// AMDGCN GFX10.
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1010:
return "gfx1010";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1011:
return "gfx1011";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1012:
return "gfx1012";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1013:
return "gfx1013";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1030:
return "gfx1030";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1031:
return "gfx1031";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1032:
return "gfx1032";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1033:
return "gfx1033";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1034:
return "gfx1034";
case ELF::EF_AMDGPU_MACH_AMDGCN_GFX1035:
return "gfx1035";
default:
llvm_unreachable("Unknown EF_AMDGPU_MACH value");
}
}
// FIXME Encode from a tablegen description or target parser.
void ELFObjectFileBase::setARMSubArch(Triple &TheTriple) const {
if (TheTriple.getSubArch() != Triple::NoSubArch)
return;
ARMAttributeParser Attributes;
if (Error E = getBuildAttributes(Attributes)) {
// TODO Propagate Error.
consumeError(std::move(E));
return;
}
std::string Triple;
// Default to ARM, but use the triple if it's been set.
if (TheTriple.isThumb())
Triple = "thumb";
else
Triple = "arm";
Optional<unsigned> Attr =
Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch);
if (Attr.hasValue()) {
switch (Attr.getValue()) {
case ARMBuildAttrs::v4:
Triple += "v4";
break;
case ARMBuildAttrs::v4T:
Triple += "v4t";
break;
case ARMBuildAttrs::v5T:
Triple += "v5t";
break;
case ARMBuildAttrs::v5TE:
Triple += "v5te";
break;
case ARMBuildAttrs::v5TEJ:
Triple += "v5tej";
break;
case ARMBuildAttrs::v6:
Triple += "v6";
break;
case ARMBuildAttrs::v6KZ:
Triple += "v6kz";
break;
case ARMBuildAttrs::v6T2:
Triple += "v6t2";
break;
case ARMBuildAttrs::v6K:
Triple += "v6k";
break;
case ARMBuildAttrs::v7: {
Optional<unsigned> ArchProfileAttr =
Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch_profile);
if (ArchProfileAttr.hasValue() &&
ArchProfileAttr.getValue() == ARMBuildAttrs::MicroControllerProfile)
Triple += "v7m";
else
Triple += "v7";
break;
}
case ARMBuildAttrs::v6_M:
Triple += "v6m";
break;
case ARMBuildAttrs::v6S_M:
Triple += "v6sm";
break;
case ARMBuildAttrs::v7E_M:
Triple += "v7em";
break;
case ARMBuildAttrs::v8_A:
Triple += "v8a";
break;
case ARMBuildAttrs::v8_R:
Triple += "v8r";
break;
case ARMBuildAttrs::v8_M_Base:
Triple += "v8m.base";
break;
case ARMBuildAttrs::v8_M_Main:
Triple += "v8m.main";
break;
case ARMBuildAttrs::v8_1_M_Main:
Triple += "v8.1m.main";
break;
}
}
if (!isLittleEndian())
Triple += "eb";
TheTriple.setArchName(Triple);
}
std::vector<std::pair<Optional<DataRefImpl>, uint64_t>>
ELFObjectFileBase::getPltAddresses() const {
std::string Err;
const auto Triple = makeTriple();
const auto *T = TargetRegistry::lookupTarget(Triple.str(), Err);
if (!T)
return {};
uint64_t JumpSlotReloc = 0;
switch (Triple.getArch()) {
case Triple::x86:
JumpSlotReloc = ELF::R_386_JUMP_SLOT;
break;
case Triple::x86_64:
JumpSlotReloc = ELF::R_X86_64_JUMP_SLOT;
break;
case Triple::aarch64:
case Triple::aarch64_be:
JumpSlotReloc = ELF::R_AARCH64_JUMP_SLOT;
break;
default:
return {};
}
std::unique_ptr<const MCInstrInfo> MII(T->createMCInstrInfo());
std::unique_ptr<const MCInstrAnalysis> MIA(
T->createMCInstrAnalysis(MII.get()));
if (!MIA)
return {};
Optional<SectionRef> Plt = None, RelaPlt = None, GotPlt = None;
for (const SectionRef &Section : sections()) {
Expected<StringRef> NameOrErr = Section.getName();
if (!NameOrErr) {
consumeError(NameOrErr.takeError());
continue;
}
StringRef Name = *NameOrErr;
if (Name == ".plt")
Plt = Section;
else if (Name == ".rela.plt" || Name == ".rel.plt")
RelaPlt = Section;
else if (Name == ".got.plt")
GotPlt = Section;
}
if (!Plt || !RelaPlt || !GotPlt)
return {};
Expected<StringRef> PltContents = Plt->getContents();
if (!PltContents) {
consumeError(PltContents.takeError());
return {};
}
auto PltEntries = MIA->findPltEntries(Plt->getAddress(),
arrayRefFromStringRef(*PltContents),
GotPlt->getAddress(), Triple);
// Build a map from GOT entry virtual address to PLT entry virtual address.
DenseMap<uint64_t, uint64_t> GotToPlt;
for (const auto &Entry : PltEntries)
GotToPlt.insert(std::make_pair(Entry.second, Entry.first));
// Find the relocations in the dynamic relocation table that point to
// locations in the GOT for which we know the corresponding PLT entry.
std::vector<std::pair<Optional<DataRefImpl>, uint64_t>> Result;
for (const auto &Relocation : RelaPlt->relocations()) {
if (Relocation.getType() != JumpSlotReloc)
continue;
auto PltEntryIter = GotToPlt.find(Relocation.getOffset());
if (PltEntryIter != GotToPlt.end()) {
symbol_iterator Sym = Relocation.getSymbol();
if (Sym == symbol_end())
Result.emplace_back(None, PltEntryIter->second);
else
Result.emplace_back(Sym->getRawDataRefImpl(), PltEntryIter->second);
}
}
return Result;
}
template <class ELFT>
static Expected<std::vector<VersionEntry>>
readDynsymVersionsImpl(const ELFFile<ELFT> &EF,
ELFObjectFileBase::elf_symbol_iterator_range Symbols) {
using Elf_Shdr = typename ELFT::Shdr;
const Elf_Shdr *VerSec = nullptr;
const Elf_Shdr *VerNeedSec = nullptr;
const Elf_Shdr *VerDefSec = nullptr;
// The user should ensure sections() can't fail here.
for (const Elf_Shdr &Sec : cantFail(EF.sections())) {
if (Sec.sh_type == ELF::SHT_GNU_versym)
VerSec = &Sec;
else if (Sec.sh_type == ELF::SHT_GNU_verdef)
VerDefSec = &Sec;
else if (Sec.sh_type == ELF::SHT_GNU_verneed)
VerNeedSec = &Sec;
}
if (!VerSec)
return std::vector<VersionEntry>();
Expected<SmallVector<Optional<VersionEntry>, 0>> MapOrErr =
EF.loadVersionMap(VerNeedSec, VerDefSec);
if (!MapOrErr)
return MapOrErr.takeError();
std::vector<VersionEntry> Ret;
size_t I = 0;
for (auto It = Symbols.begin(), E = Symbols.end(); It != E; ++It) {
++I;
Expected<const typename ELFT::Versym *> VerEntryOrErr =
EF.template getEntry<typename ELFT::Versym>(*VerSec, I);
if (!VerEntryOrErr)
return createError("unable to read an entry with index " + Twine(I) +
" from " + describe(EF, *VerSec) + ": " +
toString(VerEntryOrErr.takeError()));
Expected<uint32_t> FlagsOrErr = It->getFlags();
if (!FlagsOrErr)
return createError("unable to read flags for symbol with index " +
Twine(I) + ": " + toString(FlagsOrErr.takeError()));
bool IsDefault;
Expected<StringRef> VerOrErr = EF.getSymbolVersionByIndex(
(*VerEntryOrErr)->vs_index, IsDefault, *MapOrErr,
(*FlagsOrErr) & SymbolRef::SF_Undefined);
if (!VerOrErr)
return createError("unable to get a version for entry " + Twine(I) +
" of " + describe(EF, *VerSec) + ": " +
toString(VerOrErr.takeError()));
Ret.push_back({(*VerOrErr).str(), IsDefault});
}
return Ret;
}
Expected<std::vector<VersionEntry>>
ELFObjectFileBase::readDynsymVersions() const {
elf_symbol_iterator_range Symbols = getDynamicSymbolIterators();
if (const auto *Obj = dyn_cast<ELF32LEObjectFile>(this))
return readDynsymVersionsImpl(Obj->getELFFile(), Symbols);
if (const auto *Obj = dyn_cast<ELF32BEObjectFile>(this))
return readDynsymVersionsImpl(Obj->getELFFile(), Symbols);
if (const auto *Obj = dyn_cast<ELF64LEObjectFile>(this))
return readDynsymVersionsImpl(Obj->getELFFile(), Symbols);
return readDynsymVersionsImpl(cast<ELF64BEObjectFile>(this)->getELFFile(),
Symbols);
}
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