1 files changed, 0 insertions, 1673 deletions

diff --git a/contrib/llvm/lib/Object/WasmObjectFile.cpp b/contrib/llvm/lib/Object/WasmObjectFile.cpp
deleted file mode 100644
index 82aa1830dced..000000000000
--- a/contrib/llvm/lib/Object/WasmObjectFile.cpp
+++ /dev/null
@@ -1,1673 +0,0 @@
-//===- WasmObjectFile.cpp - Wasm 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
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/DenseSet.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallSet.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/StringSet.h"
-#include "llvm/ADT/Triple.h"
-#include "llvm/BinaryFormat/Wasm.h"
-#include "llvm/MC/SubtargetFeature.h"
-#include "llvm/Object/Binary.h"
-#include "llvm/Object/Error.h"
-#include "llvm/Object/ObjectFile.h"
-#include "llvm/Object/SymbolicFile.h"
-#include "llvm/Object/Wasm.h"
-#include "llvm/Support/Endian.h"
-#include "llvm/Support/Error.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/LEB128.h"
-#include "llvm/Support/ScopedPrinter.h"
-#include <algorithm>
-#include <cassert>
-#include <cstdint>
-#include <cstring>
-#include <system_error>
-
-#define DEBUG_TYPE "wasm-object"
-
-using namespace llvm;
-using namespace object;
-
-void WasmSymbol::print(raw_ostream &Out) const {
-  Out << "Name=" << Info.Name
-      << ", Kind=" << toString(wasm::WasmSymbolType(Info.Kind))
-      << ", Flags=" << Info.Flags;
-  if (!isTypeData()) {
-    Out << ", ElemIndex=" << Info.ElementIndex;
-  } else if (isDefined()) {
-    Out << ", Segment=" << Info.DataRef.Segment;
-    Out << ", Offset=" << Info.DataRef.Offset;
-    Out << ", Size=" << Info.DataRef.Size;
-  }
-}
-
-#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
-LLVM_DUMP_METHOD void WasmSymbol::dump() const { print(dbgs()); }
-#endif
-
-Expected<std::unique_ptr<WasmObjectFile>>
-ObjectFile::createWasmObjectFile(MemoryBufferRef Buffer) {
-  Error Err = Error::success();
-  auto ObjectFile = llvm::make_unique<WasmObjectFile>(Buffer, Err);
-  if (Err)
-    return std::move(Err);
-
-  return std::move(ObjectFile);
-}
-
-#define VARINT7_MAX ((1 << 7) - 1)
-#define VARINT7_MIN (-(1 << 7))
-#define VARUINT7_MAX (1 << 7)
-#define VARUINT1_MAX (1)
-
-static uint8_t readUint8(WasmObjectFile::ReadContext &Ctx) {
-  if (Ctx.Ptr == Ctx.End)
-    report_fatal_error("EOF while reading uint8");
-  return *Ctx.Ptr++;
-}
-
-static uint32_t readUint32(WasmObjectFile::ReadContext &Ctx) {
-  if (Ctx.Ptr + 4 > Ctx.End)
-    report_fatal_error("EOF while reading uint32");
-  uint32_t Result = support::endian::read32le(Ctx.Ptr);
-  Ctx.Ptr += 4;
-  return Result;
-}
-
-static int32_t readFloat32(WasmObjectFile::ReadContext &Ctx) {
-  if (Ctx.Ptr + 4 > Ctx.End)
-    report_fatal_error("EOF while reading float64");
-  int32_t Result = 0;
-  memcpy(&Result, Ctx.Ptr, sizeof(Result));
-  Ctx.Ptr += sizeof(Result);
-  return Result;
-}
-
-static int64_t readFloat64(WasmObjectFile::ReadContext &Ctx) {
-  if (Ctx.Ptr + 8 > Ctx.End)
-    report_fatal_error("EOF while reading float64");
-  int64_t Result = 0;
-  memcpy(&Result, Ctx.Ptr, sizeof(Result));
-  Ctx.Ptr += sizeof(Result);
-  return Result;
-}
-
-static uint64_t readULEB128(WasmObjectFile::ReadContext &Ctx) {
-  unsigned Count;
-  const char *Error = nullptr;
-  uint64_t Result = decodeULEB128(Ctx.Ptr, &Count, Ctx.End, &Error);
-  if (Error)
-    report_fatal_error(Error);
-  Ctx.Ptr += Count;
-  return Result;
-}
-
-static StringRef readString(WasmObjectFile::ReadContext &Ctx) {
-  uint32_t StringLen = readULEB128(Ctx);
-  if (Ctx.Ptr + StringLen > Ctx.End)
-    report_fatal_error("EOF while reading string");
-  StringRef Return =
-      StringRef(reinterpret_cast<const char *>(Ctx.Ptr), StringLen);
-  Ctx.Ptr += StringLen;
-  return Return;
-}
-
-static int64_t readLEB128(WasmObjectFile::ReadContext &Ctx) {
-  unsigned Count;
-  const char *Error = nullptr;
-  uint64_t Result = decodeSLEB128(Ctx.Ptr, &Count, Ctx.End, &Error);
-  if (Error)
-    report_fatal_error(Error);
-  Ctx.Ptr += Count;
-  return Result;
-}
-
-static uint8_t readVaruint1(WasmObjectFile::ReadContext &Ctx) {
-  int64_t Result = readLEB128(Ctx);
-  if (Result > VARUINT1_MAX || Result < 0)
-    report_fatal_error("LEB is outside Varuint1 range");
-  return Result;
-}
-
-static int32_t readVarint32(WasmObjectFile::ReadContext &Ctx) {
-  int64_t Result = readLEB128(Ctx);
-  if (Result > INT32_MAX || Result < INT32_MIN)
-    report_fatal_error("LEB is outside Varint32 range");
-  return Result;
-}
-
-static uint32_t readVaruint32(WasmObjectFile::ReadContext &Ctx) {
-  uint64_t Result = readULEB128(Ctx);
-  if (Result > UINT32_MAX)
-    report_fatal_error("LEB is outside Varuint32 range");
-  return Result;
-}
-
-static int64_t readVarint64(WasmObjectFile::ReadContext &Ctx) {
-  return readLEB128(Ctx);
-}
-
-static uint8_t readOpcode(WasmObjectFile::ReadContext &Ctx) {
-  return readUint8(Ctx);
-}
-
-static Error readInitExpr(wasm::WasmInitExpr &Expr,
-                          WasmObjectFile::ReadContext &Ctx) {
-  Expr.Opcode = readOpcode(Ctx);
-
-  switch (Expr.Opcode) {
-  case wasm::WASM_OPCODE_I32_CONST:
-    Expr.Value.Int32 = readVarint32(Ctx);
-    break;
-  case wasm::WASM_OPCODE_I64_CONST:
-    Expr.Value.Int64 = readVarint64(Ctx);
-    break;
-  case wasm::WASM_OPCODE_F32_CONST:
-    Expr.Value.Float32 = readFloat32(Ctx);
-    break;
-  case wasm::WASM_OPCODE_F64_CONST:
-    Expr.Value.Float64 = readFloat64(Ctx);
-    break;
-  case wasm::WASM_OPCODE_GLOBAL_GET:
-    Expr.Value.Global = readULEB128(Ctx);
-    break;
-  default:
-    return make_error<GenericBinaryError>("Invalid opcode in init_expr",
-                                          object_error::parse_failed);
-  }
-
-  uint8_t EndOpcode = readOpcode(Ctx);
-  if (EndOpcode != wasm::WASM_OPCODE_END) {
-    return make_error<GenericBinaryError>("Invalid init_expr",
-                                          object_error::parse_failed);
-  }
-  return Error::success();
-}
-
-static wasm::WasmLimits readLimits(WasmObjectFile::ReadContext &Ctx) {
-  wasm::WasmLimits Result;
-  Result.Flags = readVaruint32(Ctx);
-  Result.Initial = readVaruint32(Ctx);
-  if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX)
-    Result.Maximum = readVaruint32(Ctx);
-  return Result;
-}
-
-static wasm::WasmTable readTable(WasmObjectFile::ReadContext &Ctx) {
-  wasm::WasmTable Table;
-  Table.ElemType = readUint8(Ctx);
-  Table.Limits = readLimits(Ctx);
-  return Table;
-}
-
-static Error readSection(WasmSection &Section, WasmObjectFile::ReadContext &Ctx,
-                         WasmSectionOrderChecker &Checker) {
-  Section.Offset = Ctx.Ptr - Ctx.Start;
-  Section.Type = readUint8(Ctx);
-  LLVM_DEBUG(dbgs() << "readSection type=" << Section.Type << "\n");
-  uint32_t Size = readVaruint32(Ctx);
-  if (Size == 0)
-    return make_error<StringError>("Zero length section",
-                                   object_error::parse_failed);
-  if (Ctx.Ptr + Size > Ctx.End)
-    return make_error<StringError>("Section too large",
-                                   object_error::parse_failed);
-  if (Section.Type == wasm::WASM_SEC_CUSTOM) {
-    WasmObjectFile::ReadContext SectionCtx;
-    SectionCtx.Start = Ctx.Ptr;
-    SectionCtx.Ptr = Ctx.Ptr;
-    SectionCtx.End = Ctx.Ptr + Size;
-
-    Section.Name = readString(SectionCtx);
-
-    uint32_t SectionNameSize = SectionCtx.Ptr - SectionCtx.Start;
-    Ctx.Ptr += SectionNameSize;
-    Size -= SectionNameSize;
-  }
-
-  if (!Checker.isValidSectionOrder(Section.Type, Section.Name)) {
-    return make_error<StringError>("Out of order section type: " +
-                                       llvm::to_string(Section.Type),
-                                   object_error::parse_failed);
-  }
-
-  Section.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size);
-  Ctx.Ptr += Size;
-  return Error::success();
-}
-
-WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err)
-    : ObjectFile(Binary::ID_Wasm, Buffer) {
-  ErrorAsOutParameter ErrAsOutParam(&Err);
-  Header.Magic = getData().substr(0, 4);
-  if (Header.Magic != StringRef("\0asm", 4)) {
-    Err =
-        make_error<StringError>("Bad magic number", object_error::parse_failed);
-    return;
-  }
-
-  ReadContext Ctx;
-  Ctx.Start = getData().bytes_begin();
-  Ctx.Ptr = Ctx.Start + 4;
-  Ctx.End = Ctx.Start + getData().size();
-
-  if (Ctx.Ptr + 4 > Ctx.End) {
-    Err = make_error<StringError>("Missing version number",
-                                  object_error::parse_failed);
-    return;
-  }
-
-  Header.Version = readUint32(Ctx);
-  if (Header.Version != wasm::WasmVersion) {
-    Err = make_error<StringError>("Bad version number",
-                                  object_error::parse_failed);
-    return;
-  }
-
-  WasmSection Sec;
-  WasmSectionOrderChecker Checker;
-  while (Ctx.Ptr < Ctx.End) {
-    if ((Err = readSection(Sec, Ctx, Checker)))
-      return;
-    if ((Err = parseSection(Sec)))
-      return;
-
-    Sections.push_back(Sec);
-  }
-}
-
-Error WasmObjectFile::parseSection(WasmSection &Sec) {
-  ReadContext Ctx;
-  Ctx.Start = Sec.Content.data();
-  Ctx.End = Ctx.Start + Sec.Content.size();
-  Ctx.Ptr = Ctx.Start;
-  switch (Sec.Type) {
-  case wasm::WASM_SEC_CUSTOM:
-    return parseCustomSection(Sec, Ctx);
-  case wasm::WASM_SEC_TYPE:
-    return parseTypeSection(Ctx);
-  case wasm::WASM_SEC_IMPORT:
-    return parseImportSection(Ctx);
-  case wasm::WASM_SEC_FUNCTION:
-    return parseFunctionSection(Ctx);
-  case wasm::WASM_SEC_TABLE:
-    return parseTableSection(Ctx);
-  case wasm::WASM_SEC_MEMORY:
-    return parseMemorySection(Ctx);
-  case wasm::WASM_SEC_GLOBAL:
-    return parseGlobalSection(Ctx);
-  case wasm::WASM_SEC_EVENT:
-    return parseEventSection(Ctx);
-  case wasm::WASM_SEC_EXPORT:
-    return parseExportSection(Ctx);
-  case wasm::WASM_SEC_START:
-    return parseStartSection(Ctx);
-  case wasm::WASM_SEC_ELEM:
-    return parseElemSection(Ctx);
-  case wasm::WASM_SEC_CODE:
-    return parseCodeSection(Ctx);
-  case wasm::WASM_SEC_DATA:
-    return parseDataSection(Ctx);
-  case wasm::WASM_SEC_DATACOUNT:
-    return parseDataCountSection(Ctx);
-  default:
-    return make_error<GenericBinaryError>(
-        "Invalid section type: " + Twine(Sec.Type), object_error::parse_failed);
-  }
-}
-
-Error WasmObjectFile::parseDylinkSection(ReadContext &Ctx) {
-  // See https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md
-  HasDylinkSection = true;
-  DylinkInfo.MemorySize = readVaruint32(Ctx);
-  DylinkInfo.MemoryAlignment = readVaruint32(Ctx);
-  DylinkInfo.TableSize = readVaruint32(Ctx);
-  DylinkInfo.TableAlignment = readVaruint32(Ctx);
-  uint32_t Count = readVaruint32(Ctx);
-  while (Count--) {
-    DylinkInfo.Needed.push_back(readString(Ctx));
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("dylink section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseNameSection(ReadContext &Ctx) {
-  llvm::DenseSet<uint64_t> Seen;
-  if (Functions.size() != FunctionTypes.size()) {
-    return make_error<GenericBinaryError>("Names must come after code section",
-                                          object_error::parse_failed);
-  }
-
-  while (Ctx.Ptr < Ctx.End) {
-    uint8_t Type = readUint8(Ctx);
-    uint32_t Size = readVaruint32(Ctx);
-    const uint8_t *SubSectionEnd = Ctx.Ptr + Size;
-    switch (Type) {
-    case wasm::WASM_NAMES_FUNCTION: {
-      uint32_t Count = readVaruint32(Ctx);
-      while (Count--) {
-        uint32_t Index = readVaruint32(Ctx);
-        if (!Seen.insert(Index).second)
-          return make_error<GenericBinaryError>("Function named more than once",
-                                                object_error::parse_failed);
-        StringRef Name = readString(Ctx);
-        if (!isValidFunctionIndex(Index) || Name.empty())
-          return make_error<GenericBinaryError>("Invalid name entry",
-                                                object_error::parse_failed);
-        DebugNames.push_back(wasm::WasmFunctionName{Index, Name});
-        if (isDefinedFunctionIndex(Index))
-          getDefinedFunction(Index).DebugName = Name;
-      }
-      break;
-    }
-    // Ignore local names for now
-    case wasm::WASM_NAMES_LOCAL:
-    default:
-      Ctx.Ptr += Size;
-      break;
-    }
-    if (Ctx.Ptr != SubSectionEnd)
-      return make_error<GenericBinaryError>(
-          "Name sub-section ended prematurely", object_error::parse_failed);
-  }
-
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Name section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseLinkingSection(ReadContext &Ctx) {
-  HasLinkingSection = true;
-  if (Functions.size() != FunctionTypes.size()) {
-    return make_error<GenericBinaryError>(
-        "Linking data must come after code section",
-        object_error::parse_failed);
-  }
-
-  LinkingData.Version = readVaruint32(Ctx);
-  if (LinkingData.Version != wasm::WasmMetadataVersion) {
-    return make_error<GenericBinaryError>(
-        "Unexpected metadata version: " + Twine(LinkingData.Version) +
-            " (Expected: " + Twine(wasm::WasmMetadataVersion) + ")",
-        object_error::parse_failed);
-  }
-
-  const uint8_t *OrigEnd = Ctx.End;
-  while (Ctx.Ptr < OrigEnd) {
-    Ctx.End = OrigEnd;
-    uint8_t Type = readUint8(Ctx);
-    uint32_t Size = readVaruint32(Ctx);
-    LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size
-                      << "\n");
-    Ctx.End = Ctx.Ptr + Size;
-    switch (Type) {
-    case wasm::WASM_SYMBOL_TABLE:
-      if (Error Err = parseLinkingSectionSymtab(Ctx))
-        return Err;
-      break;
-    case wasm::WASM_SEGMENT_INFO: {
-      uint32_t Count = readVaruint32(Ctx);
-      if (Count > DataSegments.size())
-        return make_error<GenericBinaryError>("Too many segment names",
-                                              object_error::parse_failed);
-      for (uint32_t I = 0; I < Count; I++) {
-        DataSegments[I].Data.Name = readString(Ctx);
-        DataSegments[I].Data.Alignment = readVaruint32(Ctx);
-        DataSegments[I].Data.LinkerFlags = readVaruint32(Ctx);
-      }
-      break;
-    }
-    case wasm::WASM_INIT_FUNCS: {
-      uint32_t Count = readVaruint32(Ctx);
-      LinkingData.InitFunctions.reserve(Count);
-      for (uint32_t I = 0; I < Count; I++) {
-        wasm::WasmInitFunc Init;
-        Init.Priority = readVaruint32(Ctx);
-        Init.Symbol = readVaruint32(Ctx);
-        if (!isValidFunctionSymbol(Init.Symbol))
-          return make_error<GenericBinaryError>("Invalid function symbol: " +
-                                                    Twine(Init.Symbol),
-                                                object_error::parse_failed);
-        LinkingData.InitFunctions.emplace_back(Init);
-      }
-      break;
-    }
-    case wasm::WASM_COMDAT_INFO:
-      if (Error Err = parseLinkingSectionComdat(Ctx))
-        return Err;
-      break;
-    default:
-      Ctx.Ptr += Size;
-      break;
-    }
-    if (Ctx.Ptr != Ctx.End)
-      return make_error<GenericBinaryError>(
-          "Linking sub-section ended prematurely", object_error::parse_failed);
-  }
-  if (Ctx.Ptr != OrigEnd)
-    return make_error<GenericBinaryError>("Linking section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) {
-  uint32_t Count = readVaruint32(Ctx);
-  LinkingData.SymbolTable.reserve(Count);
-  Symbols.reserve(Count);
-  StringSet<> SymbolNames;
-
-  std::vector<wasm::WasmImport *> ImportedGlobals;
-  std::vector<wasm::WasmImport *> ImportedFunctions;
-  std::vector<wasm::WasmImport *> ImportedEvents;
-  ImportedGlobals.reserve(Imports.size());
-  ImportedFunctions.reserve(Imports.size());
-  ImportedEvents.reserve(Imports.size());
-  for (auto &I : Imports) {
-    if (I.Kind == wasm::WASM_EXTERNAL_FUNCTION)
-      ImportedFunctions.emplace_back(&I);
-    else if (I.Kind == wasm::WASM_EXTERNAL_GLOBAL)
-      ImportedGlobals.emplace_back(&I);
-    else if (I.Kind == wasm::WASM_EXTERNAL_EVENT)
-      ImportedEvents.emplace_back(&I);
-  }
-
-  while (Count--) {
-    wasm::WasmSymbolInfo Info;
-    const wasm::WasmSignature *Signature = nullptr;
-    const wasm::WasmGlobalType *GlobalType = nullptr;
-    const wasm::WasmEventType *EventType = nullptr;
-
-    Info.Kind = readUint8(Ctx);
-    Info.Flags = readVaruint32(Ctx);
-    bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0;
-
-    switch (Info.Kind) {
-    case wasm::WASM_SYMBOL_TYPE_FUNCTION:
-      Info.ElementIndex = readVaruint32(Ctx);
-      if (!isValidFunctionIndex(Info.ElementIndex) ||
-          IsDefined != isDefinedFunctionIndex(Info.ElementIndex))
-        return make_error<GenericBinaryError>("invalid function symbol index",
-                                              object_error::parse_failed);
-      if (IsDefined) {
-        Info.Name = readString(Ctx);
-        unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions;
-        Signature = &Signatures[FunctionTypes[FuncIndex]];
-        wasm::WasmFunction &Function = Functions[FuncIndex];
-        if (Function.SymbolName.empty())
-          Function.SymbolName = Info.Name;
-      } else {
-        wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex];
-        if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0)
-          Info.Name = readString(Ctx);
-        else
-          Info.Name = Import.Field;
-        Signature = &Signatures[Import.SigIndex];
-        Info.ImportName = Import.Field;
-        Info.ImportModule = Import.Module;
-      }
-      break;
-
-    case wasm::WASM_SYMBOL_TYPE_GLOBAL:
-      Info.ElementIndex = readVaruint32(Ctx);
-      if (!isValidGlobalIndex(Info.ElementIndex) ||
-          IsDefined != isDefinedGlobalIndex(Info.ElementIndex))
-        return make_error<GenericBinaryError>("invalid global symbol index",
-                                              object_error::parse_failed);
-      if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) ==
-                            wasm::WASM_SYMBOL_BINDING_WEAK)
-        return make_error<GenericBinaryError>("undefined weak global symbol",
-                                              object_error::parse_failed);
-      if (IsDefined) {
-        Info.Name = readString(Ctx);
-        unsigned GlobalIndex = Info.ElementIndex - NumImportedGlobals;
-        wasm::WasmGlobal &Global = Globals[GlobalIndex];
-        GlobalType = &Global.Type;
-        if (Global.SymbolName.empty())
-          Global.SymbolName = Info.Name;
-      } else {
-        wasm::WasmImport &Import = *ImportedGlobals[Info.ElementIndex];
-        if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0)
-          Info.Name = readString(Ctx);
-        else
-          Info.Name = Import.Field;
-        GlobalType = &Import.Global;
-        Info.ImportName = Import.Field;
-        Info.ImportModule = Import.Module;
-      }
-      break;
-
-    case wasm::WASM_SYMBOL_TYPE_DATA:
-      Info.Name = readString(Ctx);
-      if (IsDefined) {
-        uint32_t Index = readVaruint32(Ctx);
-        if (Index >= DataSegments.size())
-          return make_error<GenericBinaryError>("invalid data symbol index",
-                                                object_error::parse_failed);
-        uint32_t Offset = readVaruint32(Ctx);
-        uint32_t Size = readVaruint32(Ctx);
-        if (Offset + Size > DataSegments[Index].Data.Content.size())
-          return make_error<GenericBinaryError>("invalid data symbol offset",
-                                                object_error::parse_failed);
-        Info.DataRef = wasm::WasmDataReference{Index, Offset, Size};
-      }
-      break;
-
-    case wasm::WASM_SYMBOL_TYPE_SECTION: {
-      if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) !=
-          wasm::WASM_SYMBOL_BINDING_LOCAL)
-        return make_error<GenericBinaryError>(
-            "Section symbols must have local binding",
-            object_error::parse_failed);
-      Info.ElementIndex = readVaruint32(Ctx);
-      // Use somewhat unique section name as symbol name.
-      StringRef SectionName = Sections[Info.ElementIndex].Name;
-      Info.Name = SectionName;
-      break;
-    }
-
-    case wasm::WASM_SYMBOL_TYPE_EVENT: {
-      Info.ElementIndex = readVaruint32(Ctx);
-      if (!isValidEventIndex(Info.ElementIndex) ||
-          IsDefined != isDefinedEventIndex(Info.ElementIndex))
-        return make_error<GenericBinaryError>("invalid event symbol index",
-                                              object_error::parse_failed);
-      if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) ==
-                            wasm::WASM_SYMBOL_BINDING_WEAK)
-        return make_error<GenericBinaryError>("undefined weak global symbol",
-                                              object_error::parse_failed);
-      if (IsDefined) {
-        Info.Name = readString(Ctx);
-        unsigned EventIndex = Info.ElementIndex - NumImportedEvents;
-        wasm::WasmEvent &Event = Events[EventIndex];
-        Signature = &Signatures[Event.Type.SigIndex];
-        EventType = &Event.Type;
-        if (Event.SymbolName.empty())
-          Event.SymbolName = Info.Name;
-
-      } else {
-        wasm::WasmImport &Import = *ImportedEvents[Info.ElementIndex];
-        if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0)
-          Info.Name = readString(Ctx);
-        else
-          Info.Name = Import.Field;
-        EventType = &Import.Event;
-        Signature = &Signatures[EventType->SigIndex];
-        Info.ImportName = Import.Field;
-        Info.ImportModule = Import.Module;
-      }
-      break;
-    }
-
-    default:
-      return make_error<GenericBinaryError>("Invalid symbol type",
-                                            object_error::parse_failed);
-    }
-
-    if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) !=
-            wasm::WASM_SYMBOL_BINDING_LOCAL &&
-        !SymbolNames.insert(Info.Name).second)
-      return make_error<GenericBinaryError>("Duplicate symbol name " +
-                                                Twine(Info.Name),
-                                            object_error::parse_failed);
-    LinkingData.SymbolTable.emplace_back(Info);
-    Symbols.emplace_back(LinkingData.SymbolTable.back(), GlobalType, EventType,
-                         Signature);
-    LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n");
-  }
-
-  return Error::success();
-}
-
-Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) {
-  uint32_t ComdatCount = readVaruint32(Ctx);
-  StringSet<> ComdatSet;
-  for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) {
-    StringRef Name = readString(Ctx);
-    if (Name.empty() || !ComdatSet.insert(Name).second)
-      return make_error<GenericBinaryError>("Bad/duplicate COMDAT name " +
-                                                Twine(Name),
-                                            object_error::parse_failed);
-    LinkingData.Comdats.emplace_back(Name);
-    uint32_t Flags = readVaruint32(Ctx);
-    if (Flags != 0)
-      return make_error<GenericBinaryError>("Unsupported COMDAT flags",
-                                            object_error::parse_failed);
-
-    uint32_t EntryCount = readVaruint32(Ctx);
-    while (EntryCount--) {
-      unsigned Kind = readVaruint32(Ctx);
-      unsigned Index = readVaruint32(Ctx);
-      switch (Kind) {
-      default:
-        return make_error<GenericBinaryError>("Invalid COMDAT entry type",
-                                              object_error::parse_failed);
-      case wasm::WASM_COMDAT_DATA:
-        if (Index >= DataSegments.size())
-          return make_error<GenericBinaryError>(
-              "COMDAT data index out of range", object_error::parse_failed);
-        if (DataSegments[Index].Data.Comdat != UINT32_MAX)
-          return make_error<GenericBinaryError>("Data segment in two COMDATs",
-                                                object_error::parse_failed);
-        DataSegments[Index].Data.Comdat = ComdatIndex;
-        break;
-      case wasm::WASM_COMDAT_FUNCTION:
-        if (!isDefinedFunctionIndex(Index))
-          return make_error<GenericBinaryError>(
-              "COMDAT function index out of range", object_error::parse_failed);
-        if (getDefinedFunction(Index).Comdat != UINT32_MAX)
-          return make_error<GenericBinaryError>("Function in two COMDATs",
-                                                object_error::parse_failed);
-        getDefinedFunction(Index).Comdat = ComdatIndex;
-        break;
-      }
-    }
-  }
-  return Error::success();
-}
-
-Error WasmObjectFile::parseProducersSection(ReadContext &Ctx) {
-  llvm::SmallSet<StringRef, 3> FieldsSeen;
-  uint32_t Fields = readVaruint32(Ctx);
-  for (size_t I = 0; I < Fields; ++I) {
-    StringRef FieldName = readString(Ctx);
-    if (!FieldsSeen.insert(FieldName).second)
-      return make_error<GenericBinaryError>(
-          "Producers section does not have unique fields",
-          object_error::parse_failed);
-    std::vector<std::pair<std::string, std::string>> *ProducerVec = nullptr;
-    if (FieldName == "language") {
-      ProducerVec = &ProducerInfo.Languages;
-    } else if (FieldName == "processed-by") {
-      ProducerVec = &ProducerInfo.Tools;
-    } else if (FieldName == "sdk") {
-      ProducerVec = &ProducerInfo.SDKs;
-    } else {
-      return make_error<GenericBinaryError>(
-          "Producers section field is not named one of language, processed-by, "
-          "or sdk",
-          object_error::parse_failed);
-    }
-    uint32_t ValueCount = readVaruint32(Ctx);
-    llvm::SmallSet<StringRef, 8> ProducersSeen;
-    for (size_t J = 0; J < ValueCount; ++J) {
-      StringRef Name = readString(Ctx);
-      StringRef Version = readString(Ctx);
-      if (!ProducersSeen.insert(Name).second) {
-        return make_error<GenericBinaryError>(
-            "Producers section contains repeated producer",
-            object_error::parse_failed);
-      }
-      ProducerVec->emplace_back(Name, Version);
-    }
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Producers section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseTargetFeaturesSection(ReadContext &Ctx) {
-  llvm::SmallSet<std::string, 8> FeaturesSeen;
-  uint32_t FeatureCount = readVaruint32(Ctx);
-  for (size_t I = 0; I < FeatureCount; ++I) {
-    wasm::WasmFeatureEntry Feature;
-    Feature.Prefix = readUint8(Ctx);
-    switch (Feature.Prefix) {
-    case wasm::WASM_FEATURE_PREFIX_USED:
-    case wasm::WASM_FEATURE_PREFIX_REQUIRED:
-    case wasm::WASM_FEATURE_PREFIX_DISALLOWED:
-      break;
-    default:
-      return make_error<GenericBinaryError>("Unknown feature policy prefix",
-                                            object_error::parse_failed);
-    }
-    Feature.Name = readString(Ctx);
-    if (!FeaturesSeen.insert(Feature.Name).second)
-      return make_error<GenericBinaryError>(
-          "Target features section contains repeated feature \"" +
-              Feature.Name + "\"",
-          object_error::parse_failed);
-    TargetFeatures.push_back(Feature);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>(
-        "Target features section ended prematurely",
-        object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) {
-  uint32_t SectionIndex = readVaruint32(Ctx);
-  if (SectionIndex >= Sections.size())
-    return make_error<GenericBinaryError>("Invalid section index",
-                                          object_error::parse_failed);
-  WasmSection &Section = Sections[SectionIndex];
-  uint32_t RelocCount = readVaruint32(Ctx);
-  uint32_t EndOffset = Section.Content.size();
-  uint32_t PreviousOffset = 0;
-  while (RelocCount--) {
-    wasm::WasmRelocation Reloc = {};
-    Reloc.Type = readVaruint32(Ctx);
-    Reloc.Offset = readVaruint32(Ctx);
-    if (Reloc.Offset < PreviousOffset)
-      return make_error<GenericBinaryError>("Relocations not in offset order",
-                                            object_error::parse_failed);
-    PreviousOffset = Reloc.Offset;
-    Reloc.Index = readVaruint32(Ctx);
-    switch (Reloc.Type) {
-    case wasm::R_WASM_FUNCTION_INDEX_LEB:
-    case wasm::R_WASM_TABLE_INDEX_SLEB:
-    case wasm::R_WASM_TABLE_INDEX_I32:
-    case wasm::R_WASM_TABLE_INDEX_REL_SLEB:
-      if (!isValidFunctionSymbol(Reloc.Index))
-        return make_error<GenericBinaryError>("Bad relocation function index",
-                                              object_error::parse_failed);
-      break;
-    case wasm::R_WASM_TYPE_INDEX_LEB:
-      if (Reloc.Index >= Signatures.size())
-        return make_error<GenericBinaryError>("Bad relocation type index",
-                                              object_error::parse_failed);
-      break;
-    case wasm::R_WASM_GLOBAL_INDEX_LEB:
-      // R_WASM_GLOBAL_INDEX_LEB are can be used against function and data
-      // symbols to refer to thier GOT enties.
-      if (!isValidGlobalSymbol(Reloc.Index) &&
-          !isValidDataSymbol(Reloc.Index) &&
-          !isValidFunctionSymbol(Reloc.Index))
-        return make_error<GenericBinaryError>("Bad relocation global index",
-                                              object_error::parse_failed);
-      break;
-    case wasm::R_WASM_EVENT_INDEX_LEB:
-      if (!isValidEventSymbol(Reloc.Index))
-        return make_error<GenericBinaryError>("Bad relocation event index",
-                                              object_error::parse_failed);
-      break;
-    case wasm::R_WASM_MEMORY_ADDR_LEB:
-    case wasm::R_WASM_MEMORY_ADDR_SLEB:
-    case wasm::R_WASM_MEMORY_ADDR_I32:
-    case wasm::R_WASM_MEMORY_ADDR_REL_SLEB:
-      if (!isValidDataSymbol(Reloc.Index))
-        return make_error<GenericBinaryError>("Bad relocation data index",
-                                              object_error::parse_failed);
-      Reloc.Addend = readVarint32(Ctx);
-      break;
-    case wasm::R_WASM_FUNCTION_OFFSET_I32:
-      if (!isValidFunctionSymbol(Reloc.Index))
-        return make_error<GenericBinaryError>("Bad relocation function index",
-                                              object_error::parse_failed);
-      Reloc.Addend = readVarint32(Ctx);
-      break;
-    case wasm::R_WASM_SECTION_OFFSET_I32:
-      if (!isValidSectionSymbol(Reloc.Index))
-        return make_error<GenericBinaryError>("Bad relocation section index",
-                                              object_error::parse_failed);
-      Reloc.Addend = readVarint32(Ctx);
-      break;
-    default:
-      return make_error<GenericBinaryError>("Bad relocation type: " +
-                                                Twine(Reloc.Type),
-                                            object_error::parse_failed);
-    }
-
-    // Relocations must fit inside the section, and must appear in order.  They
-    // also shouldn't overlap a function/element boundary, but we don't bother
-    // to check that.
-    uint64_t Size = 5;
-    if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I32 ||
-        Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I32 ||
-        Reloc.Type == wasm::R_WASM_SECTION_OFFSET_I32 ||
-        Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I32)
-      Size = 4;
-    if (Reloc.Offset + Size > EndOffset)
-      return make_error<GenericBinaryError>("Bad relocation offset",
-                                            object_error::parse_failed);
-
-    Section.Relocations.push_back(Reloc);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Reloc section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) {
-  if (Sec.Name == "dylink") {
-    if (Error Err = parseDylinkSection(Ctx))
-      return Err;
-  } else if (Sec.Name == "name") {
-    if (Error Err = parseNameSection(Ctx))
-      return Err;
-  } else if (Sec.Name == "linking") {
-    if (Error Err = parseLinkingSection(Ctx))
-      return Err;
-  } else if (Sec.Name == "producers") {
-    if (Error Err = parseProducersSection(Ctx))
-      return Err;
-  } else if (Sec.Name == "target_features") {
-    if (Error Err = parseTargetFeaturesSection(Ctx))
-      return Err;
-  } else if (Sec.Name.startswith("reloc.")) {
-    if (Error Err = parseRelocSection(Sec.Name, Ctx))
-      return Err;
-  }
-  return Error::success();
-}
-
-Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) {
-  uint32_t Count = readVaruint32(Ctx);
-  Signatures.reserve(Count);
-  while (Count--) {
-    wasm::WasmSignature Sig;
-    uint8_t Form = readUint8(Ctx);
-    if (Form != wasm::WASM_TYPE_FUNC) {
-      return make_error<GenericBinaryError>("Invalid signature type",
-                                            object_error::parse_failed);
-    }
-    uint32_t ParamCount = readVaruint32(Ctx);
-    Sig.Params.reserve(ParamCount);
-    while (ParamCount--) {
-      uint32_t ParamType = readUint8(Ctx);
-      Sig.Params.push_back(wasm::ValType(ParamType));
-    }
-    uint32_t ReturnCount = readVaruint32(Ctx);
-    if (ReturnCount) {
-      if (ReturnCount != 1) {
-        return make_error<GenericBinaryError>(
-            "Multiple return types not supported", object_error::parse_failed);
-      }
-      Sig.Returns.push_back(wasm::ValType(readUint8(Ctx)));
-    }
-    Signatures.push_back(std::move(Sig));
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Type section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseImportSection(ReadContext &Ctx) {
-  uint32_t Count = readVaruint32(Ctx);
-  Imports.reserve(Count);
-  for (uint32_t I = 0; I < Count; I++) {
-    wasm::WasmImport Im;
-    Im.Module = readString(Ctx);
-    Im.Field = readString(Ctx);
-    Im.Kind = readUint8(Ctx);
-    switch (Im.Kind) {
-    case wasm::WASM_EXTERNAL_FUNCTION:
-      NumImportedFunctions++;
-      Im.SigIndex = readVaruint32(Ctx);
-      break;
-    case wasm::WASM_EXTERNAL_GLOBAL:
-      NumImportedGlobals++;
-      Im.Global.Type = readUint8(Ctx);
-      Im.Global.Mutable = readVaruint1(Ctx);
-      break;
-    case wasm::WASM_EXTERNAL_MEMORY:
-      Im.Memory = readLimits(Ctx);
-      break;
-    case wasm::WASM_EXTERNAL_TABLE:
-      Im.Table = readTable(Ctx);
-      if (Im.Table.ElemType != wasm::WASM_TYPE_FUNCREF)
-        return make_error<GenericBinaryError>("Invalid table element type",
-                                              object_error::parse_failed);
-      break;
-    case wasm::WASM_EXTERNAL_EVENT:
-      NumImportedEvents++;
-      Im.Event.Attribute = readVarint32(Ctx);
-      Im.Event.SigIndex = readVarint32(Ctx);
-      break;
-    default:
-      return make_error<GenericBinaryError>("Unexpected import kind",
-                                            object_error::parse_failed);
-    }
-    Imports.push_back(Im);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Import section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) {
-  uint32_t Count = readVaruint32(Ctx);
-  FunctionTypes.reserve(Count);
-  uint32_t NumTypes = Signatures.size();
-  while (Count--) {
-    uint32_t Type = readVaruint32(Ctx);
-    if (Type >= NumTypes)
-      return make_error<GenericBinaryError>("Invalid function type",
-                                            object_error::parse_failed);
-    FunctionTypes.push_back(Type);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Function section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseTableSection(ReadContext &Ctx) {
-  uint32_t Count = readVaruint32(Ctx);
-  Tables.reserve(Count);
-  while (Count--) {
-    Tables.push_back(readTable(Ctx));
-    if (Tables.back().ElemType != wasm::WASM_TYPE_FUNCREF) {
-      return make_error<GenericBinaryError>("Invalid table element type",
-                                            object_error::parse_failed);
-    }
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Table section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) {
-  uint32_t Count = readVaruint32(Ctx);
-  Memories.reserve(Count);
-  while (Count--) {
-    Memories.push_back(readLimits(Ctx));
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Memory section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) {
-  GlobalSection = Sections.size();
-  uint32_t Count = readVaruint32(Ctx);
-  Globals.reserve(Count);
-  while (Count--) {
-    wasm::WasmGlobal Global;
-    Global.Index = NumImportedGlobals + Globals.size();
-    Global.Type.Type = readUint8(Ctx);
-    Global.Type.Mutable = readVaruint1(Ctx);
-    if (Error Err = readInitExpr(Global.InitExpr, Ctx))
-      return Err;
-    Globals.push_back(Global);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Global section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseEventSection(ReadContext &Ctx) {
-  EventSection = Sections.size();
-  uint32_t Count = readVarint32(Ctx);
-  Events.reserve(Count);
-  while (Count--) {
-    wasm::WasmEvent Event;
-    Event.Index = NumImportedEvents + Events.size();
-    Event.Type.Attribute = readVaruint32(Ctx);
-    Event.Type.SigIndex = readVarint32(Ctx);
-    Events.push_back(Event);
-  }
-
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Event section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseExportSection(ReadContext &Ctx) {
-  uint32_t Count = readVaruint32(Ctx);
-  Exports.reserve(Count);
-  for (uint32_t I = 0; I < Count; I++) {
-    wasm::WasmExport Ex;
-    Ex.Name = readString(Ctx);
-    Ex.Kind = readUint8(Ctx);
-    Ex.Index = readVaruint32(Ctx);
-    switch (Ex.Kind) {
-    case wasm::WASM_EXTERNAL_FUNCTION:
-      if (!isValidFunctionIndex(Ex.Index))
-        return make_error<GenericBinaryError>("Invalid function export",
-                                              object_error::parse_failed);
-      break;
-    case wasm::WASM_EXTERNAL_GLOBAL:
-      if (!isValidGlobalIndex(Ex.Index))
-        return make_error<GenericBinaryError>("Invalid global export",
-                                              object_error::parse_failed);
-      break;
-    case wasm::WASM_EXTERNAL_EVENT:
-      if (!isValidEventIndex(Ex.Index))
-        return make_error<GenericBinaryError>("Invalid event export",
-                                              object_error::parse_failed);
-      break;
-    case wasm::WASM_EXTERNAL_MEMORY:
-    case wasm::WASM_EXTERNAL_TABLE:
-      break;
-    default:
-      return make_error<GenericBinaryError>("Unexpected export kind",
-                                            object_error::parse_failed);
-    }
-    Exports.push_back(Ex);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Export section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const {
-  return Index < NumImportedFunctions + FunctionTypes.size();
-}
-
-bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const {
-  return Index >= NumImportedFunctions && isValidFunctionIndex(Index);
-}
-
-bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const {
-  return Index < NumImportedGlobals + Globals.size();
-}
-
-bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const {
-  return Index >= NumImportedGlobals && isValidGlobalIndex(Index);
-}
-
-bool WasmObjectFile::isValidEventIndex(uint32_t Index) const {
-  return Index < NumImportedEvents + Events.size();
-}
-
-bool WasmObjectFile::isDefinedEventIndex(uint32_t Index) const {
-  return Index >= NumImportedEvents && isValidEventIndex(Index);
-}
-
-bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const {
-  return Index < Symbols.size() && Symbols[Index].isTypeFunction();
-}
-
-bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const {
-  return Index < Symbols.size() && Symbols[Index].isTypeGlobal();
-}
-
-bool WasmObjectFile::isValidEventSymbol(uint32_t Index) const {
-  return Index < Symbols.size() && Symbols[Index].isTypeEvent();
-}
-
-bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const {
-  return Index < Symbols.size() && Symbols[Index].isTypeData();
-}
-
-bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const {
-  return Index < Symbols.size() && Symbols[Index].isTypeSection();
-}
-
-wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) {
-  assert(isDefinedFunctionIndex(Index));
-  return Functions[Index - NumImportedFunctions];
-}
-
-const wasm::WasmFunction &
-WasmObjectFile::getDefinedFunction(uint32_t Index) const {
-  assert(isDefinedFunctionIndex(Index));
-  return Functions[Index - NumImportedFunctions];
-}
-
-wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) {
-  assert(isDefinedGlobalIndex(Index));
-  return Globals[Index - NumImportedGlobals];
-}
-
-wasm::WasmEvent &WasmObjectFile::getDefinedEvent(uint32_t Index) {
-  assert(isDefinedEventIndex(Index));
-  return Events[Index - NumImportedEvents];
-}
-
-Error WasmObjectFile::parseStartSection(ReadContext &Ctx) {
-  StartFunction = readVaruint32(Ctx);
-  if (!isValidFunctionIndex(StartFunction))
-    return make_error<GenericBinaryError>("Invalid start function",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) {
-  CodeSection = Sections.size();
-  uint32_t FunctionCount = readVaruint32(Ctx);
-  if (FunctionCount != FunctionTypes.size()) {
-    return make_error<GenericBinaryError>("Invalid function count",
-                                          object_error::parse_failed);
-  }
-
-  while (FunctionCount--) {
-    wasm::WasmFunction Function;
-    const uint8_t *FunctionStart = Ctx.Ptr;
-    uint32_t Size = readVaruint32(Ctx);
-    const uint8_t *FunctionEnd = Ctx.Ptr + Size;
-
-    Function.CodeOffset = Ctx.Ptr - FunctionStart;
-    Function.Index = NumImportedFunctions + Functions.size();
-    Function.CodeSectionOffset = FunctionStart - Ctx.Start;
-    Function.Size = FunctionEnd - FunctionStart;
-
-    uint32_t NumLocalDecls = readVaruint32(Ctx);
-    Function.Locals.reserve(NumLocalDecls);
-    while (NumLocalDecls--) {
-      wasm::WasmLocalDecl Decl;
-      Decl.Count = readVaruint32(Ctx);
-      Decl.Type = readUint8(Ctx);
-      Function.Locals.push_back(Decl);
-    }
-
-    uint32_t BodySize = FunctionEnd - Ctx.Ptr;
-    Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize);
-    // This will be set later when reading in the linking metadata section.
-    Function.Comdat = UINT32_MAX;
-    Ctx.Ptr += BodySize;
-    assert(Ctx.Ptr == FunctionEnd);
-    Functions.push_back(Function);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Code section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseElemSection(ReadContext &Ctx) {
-  uint32_t Count = readVaruint32(Ctx);
-  ElemSegments.reserve(Count);
-  while (Count--) {
-    wasm::WasmElemSegment Segment;
-    Segment.TableIndex = readVaruint32(Ctx);
-    if (Segment.TableIndex != 0) {
-      return make_error<GenericBinaryError>("Invalid TableIndex",
-                                            object_error::parse_failed);
-    }
-    if (Error Err = readInitExpr(Segment.Offset, Ctx))
-      return Err;
-    uint32_t NumElems = readVaruint32(Ctx);
-    while (NumElems--) {
-      Segment.Functions.push_back(readVaruint32(Ctx));
-    }
-    ElemSegments.push_back(Segment);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Elem section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseDataSection(ReadContext &Ctx) {
-  DataSection = Sections.size();
-  uint32_t Count = readVaruint32(Ctx);
-  if (DataCount && Count != DataCount.getValue())
-    return make_error<GenericBinaryError>(
-        "Number of data segments does not match DataCount section");
-  DataSegments.reserve(Count);
-  while (Count--) {
-    WasmSegment Segment;
-    Segment.Data.InitFlags = readVaruint32(Ctx);
-    Segment.Data.MemoryIndex = (Segment.Data.InitFlags & wasm::WASM_SEGMENT_HAS_MEMINDEX)
-                               ? readVaruint32(Ctx) : 0;
-    if ((Segment.Data.InitFlags & wasm::WASM_SEGMENT_IS_PASSIVE) == 0) {
-      if (Error Err = readInitExpr(Segment.Data.Offset, Ctx))
-        return Err;
-    } else {
-      Segment.Data.Offset.Opcode = wasm::WASM_OPCODE_I32_CONST;
-      Segment.Data.Offset.Value.Int32 = 0;
-    }
-    uint32_t Size = readVaruint32(Ctx);
-    if (Size > (size_t)(Ctx.End - Ctx.Ptr))
-      return make_error<GenericBinaryError>("Invalid segment size",
-                                            object_error::parse_failed);
-    Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size);
-    // The rest of these Data fields are set later, when reading in the linking
-    // metadata section.
-    Segment.Data.Alignment = 0;
-    Segment.Data.LinkerFlags = 0;
-    Segment.Data.Comdat = UINT32_MAX;
-    Segment.SectionOffset = Ctx.Ptr - Ctx.Start;
-    Ctx.Ptr += Size;
-    DataSegments.push_back(Segment);
-  }
-  if (Ctx.Ptr != Ctx.End)
-    return make_error<GenericBinaryError>("Data section ended prematurely",
-                                          object_error::parse_failed);
-  return Error::success();
-}
-
-Error WasmObjectFile::parseDataCountSection(ReadContext &Ctx) {
-  DataCount = readVaruint32(Ctx);
-  return Error::success();
-}
-
-const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const {
-  return Header;
-}
-
-void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.b++; }
-
-uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const {
-  uint32_t Result = SymbolRef::SF_None;
-  const WasmSymbol &Sym = getWasmSymbol(Symb);
-
-  LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n");
-  if (Sym.isBindingWeak())
-    Result |= SymbolRef::SF_Weak;
-  if (!Sym.isBindingLocal())
-    Result |= SymbolRef::SF_Global;
-  if (Sym.isHidden())
-    Result |= SymbolRef::SF_Hidden;
-  if (!Sym.isDefined())
-    Result |= SymbolRef::SF_Undefined;
-  if (Sym.isTypeFunction())
-    Result |= SymbolRef::SF_Executable;
-  return Result;
-}
-
-basic_symbol_iterator WasmObjectFile::symbol_begin() const {
-  DataRefImpl Ref;
-  Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null
-  Ref.d.b = 0; // Symbol index
-  return BasicSymbolRef(Ref, this);
-}
-
-basic_symbol_iterator WasmObjectFile::symbol_end() const {
-  DataRefImpl Ref;
-  Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null
-  Ref.d.b = Symbols.size(); // Symbol index
-  return BasicSymbolRef(Ref, this);
-}
-
-const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const {
-  return Symbols[Symb.d.b];
-}
-
-const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const {
-  return getWasmSymbol(Symb.getRawDataRefImpl());
-}
-
-Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const {
-  return getWasmSymbol(Symb).Info.Name;
-}
-
-Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const {
-  auto &Sym = getWasmSymbol(Symb);
-  if (Sym.Info.Kind == wasm::WASM_SYMBOL_TYPE_FUNCTION &&
-      isDefinedFunctionIndex(Sym.Info.ElementIndex))
-    return getDefinedFunction(Sym.Info.ElementIndex).CodeSectionOffset;
-  else
-    return getSymbolValue(Symb);
-}
-
-uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol &Sym) const {
-  switch (Sym.Info.Kind) {
-  case wasm::WASM_SYMBOL_TYPE_FUNCTION:
-  case wasm::WASM_SYMBOL_TYPE_GLOBAL:
-  case wasm::WASM_SYMBOL_TYPE_EVENT:
-    return Sym.Info.ElementIndex;
-  case wasm::WASM_SYMBOL_TYPE_DATA: {
-    // The value of a data symbol is the segment offset, plus the symbol
-    // offset within the segment.
-    uint32_t SegmentIndex = Sym.Info.DataRef.Segment;
-    const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data;
-    assert(Segment.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST);
-    return Segment.Offset.Value.Int32 + Sym.Info.DataRef.Offset;
-  }
-  case wasm::WASM_SYMBOL_TYPE_SECTION:
-    return 0;
-  }
-  llvm_unreachable("invalid symbol type");
-}
-
-uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
-  return getWasmSymbolValue(getWasmSymbol(Symb));
-}
-
-uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const {
-  llvm_unreachable("not yet implemented");
-  return 0;
-}
-
-uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
-  llvm_unreachable("not yet implemented");
-  return 0;
-}
-
-Expected<SymbolRef::Type>
-WasmObjectFile::getSymbolType(DataRefImpl Symb) const {
-  const WasmSymbol &Sym = getWasmSymbol(Symb);
-
-  switch (Sym.Info.Kind) {
-  case wasm::WASM_SYMBOL_TYPE_FUNCTION:
-    return SymbolRef::ST_Function;
-  case wasm::WASM_SYMBOL_TYPE_GLOBAL:
-    return SymbolRef::ST_Other;
-  case wasm::WASM_SYMBOL_TYPE_DATA:
-    return SymbolRef::ST_Data;
-  case wasm::WASM_SYMBOL_TYPE_SECTION:
-    return SymbolRef::ST_Debug;
-  case wasm::WASM_SYMBOL_TYPE_EVENT:
-    return SymbolRef::ST_Other;
-  }
-
-  llvm_unreachable("Unknown WasmSymbol::SymbolType");
-  return SymbolRef::ST_Other;
-}
-
-Expected<section_iterator>
-WasmObjectFile::getSymbolSection(DataRefImpl Symb) const {
-  const WasmSymbol &Sym = getWasmSymbol(Symb);
-  if (Sym.isUndefined())
-    return section_end();
-
-  DataRefImpl Ref;
-  switch (Sym.Info.Kind) {
-  case wasm::WASM_SYMBOL_TYPE_FUNCTION:
-    Ref.d.a = CodeSection;
-    break;
-  case wasm::WASM_SYMBOL_TYPE_GLOBAL:
-    Ref.d.a = GlobalSection;
-    break;
-  case wasm::WASM_SYMBOL_TYPE_DATA:
-    Ref.d.a = DataSection;
-    break;
-  case wasm::WASM_SYMBOL_TYPE_SECTION:
-    Ref.d.a = Sym.Info.ElementIndex;
-    break;
-  case wasm::WASM_SYMBOL_TYPE_EVENT:
-    Ref.d.a = EventSection;
-    break;
-  default:
-    llvm_unreachable("Unknown WasmSymbol::SymbolType");
-  }
-  return section_iterator(SectionRef(Ref, this));
-}
-
-void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; }
-
-Expected<StringRef> WasmObjectFile::getSectionName(DataRefImpl Sec) const {
-  const WasmSection &S = Sections[Sec.d.a];
-#define ECase(X)                                                               \
-  case wasm::WASM_SEC_##X:                                                     \
-    return #X;
-  switch (S.Type) {
-    ECase(TYPE);
-    ECase(IMPORT);
-    ECase(FUNCTION);
-    ECase(TABLE);
-    ECase(MEMORY);
-    ECase(GLOBAL);
-    ECase(EVENT);
-    ECase(EXPORT);
-    ECase(START);
-    ECase(ELEM);
-    ECase(CODE);
-    ECase(DATA);
-    ECase(DATACOUNT);
-  case wasm::WASM_SEC_CUSTOM:
-    return S.Name;
-  default:
-    return createStringError(object_error::invalid_section_index, "");
-  }
-#undef ECase
-}
-
-uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; }
-
-uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const {
-  return Sec.d.a;
-}
-
-uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const {
-  const WasmSection &S = Sections[Sec.d.a];
-  return S.Content.size();
-}
-
-Expected<ArrayRef<uint8_t>>
-WasmObjectFile::getSectionContents(DataRefImpl Sec) const {
-  const WasmSection &S = Sections[Sec.d.a];
-  // This will never fail since wasm sections can never be empty (user-sections
-  // must have a name and non-user sections each have a defined structure).
-  return S.Content;
-}
-
-uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const {
-  return 1;
-}
-
-bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const {
-  return false;
-}
-
-bool WasmObjectFile::isSectionText(DataRefImpl Sec) const {
-  return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE;
-}
-
-bool WasmObjectFile::isSectionData(DataRefImpl Sec) const {
-  return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA;
-}
-
-bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; }
-
-bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; }
-
-bool WasmObjectFile::isSectionBitcode(DataRefImpl Sec) const { return false; }
-
-relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const {
-  DataRefImpl RelocRef;
-  RelocRef.d.a = Ref.d.a;
-  RelocRef.d.b = 0;
-  return relocation_iterator(RelocationRef(RelocRef, this));
-}
-
-relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const {
-  const WasmSection &Sec = getWasmSection(Ref);
-  DataRefImpl RelocRef;
-  RelocRef.d.a = Ref.d.a;
-  RelocRef.d.b = Sec.Relocations.size();
-  return relocation_iterator(RelocationRef(RelocRef, this));
-}
-
-void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const { Rel.d.b++; }
-
-uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const {
-  const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
-  return Rel.Offset;
-}
-
-symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Ref) const {
-  const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
-  if (Rel.Type == wasm::R_WASM_TYPE_INDEX_LEB)
-    return symbol_end();
-  DataRefImpl Sym;
-  Sym.d.a = 1;
-  Sym.d.b = Rel.Index;
-  return symbol_iterator(SymbolRef(Sym, this));
-}
-
-uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const {
-  const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
-  return Rel.Type;
-}
-
-void WasmObjectFile::getRelocationTypeName(
-    DataRefImpl Ref, SmallVectorImpl<char> &Result) const {
-  const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
-  StringRef Res = "Unknown";
-
-#define WASM_RELOC(name, value)                                                \
-  case wasm::name:                                                             \
-    Res = #name;                                                               \
-    break;
-
-  switch (Rel.Type) {
-#include "llvm/BinaryFormat/WasmRelocs.def"
-  }
-
-#undef WASM_RELOC
-
-  Result.append(Res.begin(), Res.end());
-}
-
-section_iterator WasmObjectFile::section_begin() const {
-  DataRefImpl Ref;
-  Ref.d.a = 0;
-  return section_iterator(SectionRef(Ref, this));
-}
-
-section_iterator WasmObjectFile::section_end() const {
-  DataRefImpl Ref;
-  Ref.d.a = Sections.size();
-  return section_iterator(SectionRef(Ref, this));
-}
-
-uint8_t WasmObjectFile::getBytesInAddress() const { return 4; }
-
-StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; }
-
-Triple::ArchType WasmObjectFile::getArch() const { return Triple::wasm32; }
-
-SubtargetFeatures WasmObjectFile::getFeatures() const {
-  return SubtargetFeatures();
-}
-
-bool WasmObjectFile::isRelocatableObject() const { return HasLinkingSection; }
-
-bool WasmObjectFile::isSharedObject() const { return HasDylinkSection; }
-
-const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const {
-  assert(Ref.d.a < Sections.size());
-  return Sections[Ref.d.a];
-}
-
-const WasmSection &
-WasmObjectFile::getWasmSection(const SectionRef &Section) const {
-  return getWasmSection(Section.getRawDataRefImpl());
-}
-
-const wasm::WasmRelocation &
-WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const {
-  return getWasmRelocation(Ref.getRawDataRefImpl());
-}
-
-const wasm::WasmRelocation &
-WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const {
-  assert(Ref.d.a < Sections.size());
-  const WasmSection &Sec = Sections[Ref.d.a];
-  assert(Ref.d.b < Sec.Relocations.size());
-  return Sec.Relocations[Ref.d.b];
-}
-
-int WasmSectionOrderChecker::getSectionOrder(unsigned ID,
-                                             StringRef CustomSectionName) {
-  switch (ID) {
-  case wasm::WASM_SEC_CUSTOM:
-    return StringSwitch<unsigned>(CustomSectionName)
-        .Case("dylink", WASM_SEC_ORDER_DYLINK)
-        .Case("linking", WASM_SEC_ORDER_LINKING)
-        .StartsWith("reloc.", WASM_SEC_ORDER_RELOC)
-        .Case("name", WASM_SEC_ORDER_NAME)
-        .Case("producers", WASM_SEC_ORDER_PRODUCERS)
-        .Case("target_features", WASM_SEC_ORDER_TARGET_FEATURES)
-        .Default(WASM_SEC_ORDER_NONE);
-  case wasm::WASM_SEC_TYPE:
-    return WASM_SEC_ORDER_TYPE;
-  case wasm::WASM_SEC_IMPORT:
-    return WASM_SEC_ORDER_IMPORT;
-  case wasm::WASM_SEC_FUNCTION:
-    return WASM_SEC_ORDER_FUNCTION;
-  case wasm::WASM_SEC_TABLE:
-    return WASM_SEC_ORDER_TABLE;
-  case wasm::WASM_SEC_MEMORY:
-    return WASM_SEC_ORDER_MEMORY;
-  case wasm::WASM_SEC_GLOBAL:
-    return WASM_SEC_ORDER_GLOBAL;
-  case wasm::WASM_SEC_EXPORT:
-    return WASM_SEC_ORDER_EXPORT;
-  case wasm::WASM_SEC_START:
-    return WASM_SEC_ORDER_START;
-  case wasm::WASM_SEC_ELEM:
-    return WASM_SEC_ORDER_ELEM;
-  case wasm::WASM_SEC_CODE:
-    return WASM_SEC_ORDER_CODE;
-  case wasm::WASM_SEC_DATA:
-    return WASM_SEC_ORDER_DATA;
-  case wasm::WASM_SEC_DATACOUNT:
-    return WASM_SEC_ORDER_DATACOUNT;
-  case wasm::WASM_SEC_EVENT:
-    return WASM_SEC_ORDER_EVENT;
-  default:
-    return WASM_SEC_ORDER_NONE;
-  }
-}
-
-// Represents the edges in a directed graph where any node B reachable from node
-// A is not allowed to appear before A in the section ordering, but may appear
-// afterward.
-int WasmSectionOrderChecker::DisallowedPredecessors[WASM_NUM_SEC_ORDERS][WASM_NUM_SEC_ORDERS] = {
-  {}, // WASM_SEC_ORDER_NONE
-  {WASM_SEC_ORDER_TYPE, WASM_SEC_ORDER_IMPORT}, // WASM_SEC_ORDER_TYPE,
-  {WASM_SEC_ORDER_IMPORT, WASM_SEC_ORDER_FUNCTION}, // WASM_SEC_ORDER_IMPORT,
-  {WASM_SEC_ORDER_FUNCTION, WASM_SEC_ORDER_TABLE}, // WASM_SEC_ORDER_FUNCTION,
-  {WASM_SEC_ORDER_TABLE, WASM_SEC_ORDER_MEMORY}, // WASM_SEC_ORDER_TABLE,
-  {WASM_SEC_ORDER_MEMORY, WASM_SEC_ORDER_GLOBAL}, // WASM_SEC_ORDER_MEMORY,
-  {WASM_SEC_ORDER_GLOBAL, WASM_SEC_ORDER_EVENT}, // WASM_SEC_ORDER_GLOBAL,
-  {WASM_SEC_ORDER_EVENT, WASM_SEC_ORDER_EXPORT}, // WASM_SEC_ORDER_EVENT,
-  {WASM_SEC_ORDER_EXPORT, WASM_SEC_ORDER_START}, // WASM_SEC_ORDER_EXPORT,
-  {WASM_SEC_ORDER_START, WASM_SEC_ORDER_ELEM}, // WASM_SEC_ORDER_START,
-  {WASM_SEC_ORDER_ELEM, WASM_SEC_ORDER_DATACOUNT}, // WASM_SEC_ORDER_ELEM,
-  {WASM_SEC_ORDER_DATACOUNT, WASM_SEC_ORDER_CODE}, // WASM_SEC_ORDER_DATACOUNT,
-  {WASM_SEC_ORDER_CODE, WASM_SEC_ORDER_DATA}, // WASM_SEC_ORDER_CODE,
-  {WASM_SEC_ORDER_DATA, WASM_SEC_ORDER_LINKING}, // WASM_SEC_ORDER_DATA,
-
-  // Custom Sections
-  {WASM_SEC_ORDER_DYLINK, WASM_SEC_ORDER_TYPE}, // WASM_SEC_ORDER_DYLINK,
-  {WASM_SEC_ORDER_LINKING, WASM_SEC_ORDER_RELOC, WASM_SEC_ORDER_NAME}, // WASM_SEC_ORDER_LINKING,
-  {}, // WASM_SEC_ORDER_RELOC (can be repeated),
-  {WASM_SEC_ORDER_NAME, WASM_SEC_ORDER_PRODUCERS}, // WASM_SEC_ORDER_NAME,
-  {WASM_SEC_ORDER_PRODUCERS, WASM_SEC_ORDER_TARGET_FEATURES}, // WASM_SEC_ORDER_PRODUCERS,
-  {WASM_SEC_ORDER_TARGET_FEATURES}  // WASM_SEC_ORDER_TARGET_FEATURES
-};
-
-bool WasmSectionOrderChecker::isValidSectionOrder(unsigned ID,
-                                                  StringRef CustomSectionName) {
-  int Order = getSectionOrder(ID, CustomSectionName);
-  if (Order == WASM_SEC_ORDER_NONE)
-    return true;
-
-  // Disallowed predecessors we need to check for
-  SmallVector<int, WASM_NUM_SEC_ORDERS> WorkList;
-
-  // Keep track of completed checks to avoid repeating work
-  bool Checked[WASM_NUM_SEC_ORDERS] = {};
-
-  int Curr = Order;
-  while (true) {
-    // Add new disallowed predecessors to work list
-    for (size_t I = 0;; ++I) {
-      int Next = DisallowedPredecessors[Curr][I];
-      if (Next == WASM_SEC_ORDER_NONE)
-        break;
-      if (Checked[Next])
-        continue;
-      WorkList.push_back(Next);
-      Checked[Next] = true;
-    }
-
-    if (WorkList.empty())
-      break;
-
-    // Consider next disallowed predecessor
-    Curr = WorkList.pop_back_val();
-    if (Seen[Curr])
-      return false;
-  }
-
-  // Have not seen any disallowed predecessors
-  Seen[Order] = true;
-  return true;
-}