YQ Connector: support managed ClickHouse

Со стороны dqrun можно обратиться к инстансу коннектора, который работает на streaming стенде, и извлечь данные из облачного CH.

1 files changed, 725 insertions, 0 deletions

diff --git a/contrib/libs/llvm14/lib/Object/ELFObjectFile.cpp b/contrib/libs/llvm14/lib/Object/ELFObjectFile.cpp
new file mode 100644
index 0000000000..cf1f12d9a9
--- /dev/null
+++ b/contrib/libs/llvm14/lib/Object/ELFObjectFile.cpp
@@ -0,0 +1,725 @@
+//===- 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 (const ELFSymbolRef &Sym : Symbols) {
+    ++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 = Sym.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);
+}