/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp

Bug Summary

File:	llvm/lib/Object/COFFObjectFile.cpp
Warning:	line 1700, column 3 2nd function call argument is an uninitialized value

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name COFFObjectFile.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=none -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/build-llvm/lib/Object -resource-dir /usr/lib/llvm-13/lib/clang/13.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/build-llvm/lib/Object -I /build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object -I /build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/build-llvm/include -I /build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/include -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-13/lib/clang/13.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/build-llvm/lib/Object -fdebug-prefix-map=/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9=. -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2021-05-25-184031-10426-1 -x c++ /build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp

/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp

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1//===- COFFObjectFile.cpp - COFF object file implementation ---------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file declares the COFFObjectFile class.
10//
11//===----------------------------------------------------------------------===//

13#include "llvm/ADT/ArrayRef.h"
14#include "llvm/ADT/StringRef.h"
15#include "llvm/ADT/StringSwitch.h"
16#include "llvm/ADT/Triple.h"
17#include "llvm/ADT/iterator_range.h"
18#include "llvm/BinaryFormat/COFF.h"
19#include "llvm/Object/Binary.h"
20#include "llvm/Object/COFF.h"
21#include "llvm/Object/Error.h"
22#include "llvm/Object/ObjectFile.h"
23#include "llvm/Support/BinaryStreamReader.h"
24#include "llvm/Support/Endian.h"
25#include "llvm/Support/Error.h"
26#include "llvm/Support/ErrorHandling.h"
27#include "llvm/Support/MathExtras.h"
28#include "llvm/Support/MemoryBuffer.h"
29#include <algorithm>
30#include <cassert>
31#include <cinttypes>
32#include <cstddef>
33#include <cstring>
34#include <limits>
35#include <memory>
36#include <system_error>

38using namespace llvm;
39using namespace object;

41using support::ulittle16_t;
42using support::ulittle32_t;
43using support::ulittle64_t;
44using support::little16_t;

46// Returns false if size is greater than the buffer size. And sets ec.
47static bool checkSize(MemoryBufferRef M, std::error_code &EC, uint64_t Size) {
if (M.getBufferSize() < Size) {
  EC = object_error::unexpected_eof;
  return false;
}
return true;
53}

55// Sets Obj unless any bytes in [addr, addr + size) fall outsize of m.
56// Returns unexpected_eof if error.
57template <typename T>
58static Error getObject(const T *&Obj, MemoryBufferRef M, const void *Ptr,
                     const uint64_t Size = sizeof(T)) {
uintptr_t Addr = reinterpret_cast<uintptr_t>(Ptr);
if (Error E = Binary::checkOffset(M, Addr, Size))
  return E;
Obj = reinterpret_cast<const T *>(Addr);
return Error::success();
65}

67// Decode a string table entry in base 64 (//AAAAAA). Expects \arg Str without
68// prefixed slashes.
69static bool decodeBase64StringEntry(StringRef Str, uint32_t &Result) {
assert(Str.size() <= 6 && "String too long, possible overflow.")(static_cast <bool> (Str.size() <= 6 && "String too long, possible overflow."
) ? void (0) : __assert_fail ("Str.size() <= 6 && \"String too long, possible overflow.\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 70, __extension__ __PRETTY_FUNCTION__));
if (Str.size() > 6)
  return true;

uint64_t Value = 0;
while (!Str.empty()) {
  unsigned CharVal;
  if (Str[0] >= 'A' && Str[0] <= 'Z') // 0..25
    CharVal = Str[0] - 'A';
  else if (Str[0] >= 'a' && Str[0] <= 'z') // 26..51
    CharVal = Str[0] - 'a' + 26;
  else if (Str[0] >= '0' && Str[0] <= '9') // 52..61
    CharVal = Str[0] - '0' + 52;
  else if (Str[0] == '+') // 62
    CharVal = 62;
  else if (Str[0] == '/') // 63
    CharVal = 63;
  else
    return true;

  Value = (Value * 64) + CharVal;
  Str = Str.substr(1);
}

if (Value > std::numeric_limits<uint32_t>::max())
  return true;

Result = static_cast<uint32_t>(Value);
return false;
99}

101template <typename coff_symbol_type>
102const coff_symbol_type *COFFObjectFile::toSymb(DataRefImpl Ref) const {
const coff_symbol_type *Addr =
    reinterpret_cast<const coff_symbol_type *>(Ref.p);

assert(!checkOffset(Data, reinterpret_cast<uintptr_t>(Addr), sizeof(*Addr)))(static_cast <bool> (!checkOffset(Data, reinterpret_cast
<uintptr_t>(Addr), sizeof(*Addr))) ? void (0) : __assert_fail
 ("!checkOffset(Data, reinterpret_cast<uintptr_t>(Addr), sizeof(*Addr))"
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 106, __extension__ __PRETTY_FUNCTION__));
107#ifndef NDEBUG
// Verify that the symbol points to a valid entry in the symbol table.
uintptr_t Offset =
    reinterpret_cast<uintptr_t>(Addr) - reinterpret_cast<uintptr_t>(base());

assert((Offset - getPointerToSymbolTable()) % sizeof(coff_symbol_type) == 0 &&(static_cast <bool> ((Offset - getPointerToSymbolTable(
)) % sizeof(coff_symbol_type) == 0 && "Symbol did not point to the beginning of a symbol"
) ? void (0) : __assert_fail ("(Offset - getPointerToSymbolTable()) % sizeof(coff_symbol_type) == 0 && \"Symbol did not point to the beginning of a symbol\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 113, __extension__ __PRETTY_FUNCTION__))
       "Symbol did not point to the beginning of a symbol")(static_cast <bool> ((Offset - getPointerToSymbolTable(
)) % sizeof(coff_symbol_type) == 0 && "Symbol did not point to the beginning of a symbol"
) ? void (0) : __assert_fail ("(Offset - getPointerToSymbolTable()) % sizeof(coff_symbol_type) == 0 && \"Symbol did not point to the beginning of a symbol\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 113, __extension__ __PRETTY_FUNCTION__));
114#endif

return Addr;
117}

119const coff_section *COFFObjectFile::toSec(DataRefImpl Ref) const {
const coff_section *Addr = reinterpret_cast<const coff_section*>(Ref.p);

122#ifndef NDEBUG
// Verify that the section points to a valid entry in the section table.
if (Addr < SectionTable || Addr >= (SectionTable + getNumberOfSections()))
  report_fatal_error("Section was outside of section table.");

uintptr_t Offset = reinterpret_cast<uintptr_t>(Addr) -
                   reinterpret_cast<uintptr_t>(SectionTable);
assert(Offset % sizeof(coff_section) == 0 &&(static_cast <bool> (Offset % sizeof(coff_section) == 0
 && "Section did not point to the beginning of a section"
) ? void (0) : __assert_fail ("Offset % sizeof(coff_section) == 0 && \"Section did not point to the beginning of a section\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 130, __extension__ __PRETTY_FUNCTION__))
       "Section did not point to the beginning of a section")(static_cast <bool> (Offset % sizeof(coff_section) == 0
 && "Section did not point to the beginning of a section"
) ? void (0) : __assert_fail ("Offset % sizeof(coff_section) == 0 && \"Section did not point to the beginning of a section\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 130, __extension__ __PRETTY_FUNCTION__));
131#endif

return Addr;
134}

136void COFFObjectFile::moveSymbolNext(DataRefImpl &Ref) const {
auto End = reinterpret_cast<uintptr_t>(StringTable);
if (SymbolTable16) {
  const coff_symbol16 *Symb = toSymb<coff_symbol16>(Ref);
  Symb += 1 + Symb->NumberOfAuxSymbols;
  Ref.p = std::min(reinterpret_cast<uintptr_t>(Symb), End);
} else if (SymbolTable32) {
  const coff_symbol32 *Symb = toSymb<coff_symbol32>(Ref);
  Symb += 1 + Symb->NumberOfAuxSymbols;
  Ref.p = std::min(reinterpret_cast<uintptr_t>(Symb), End);
} else {
  llvm_unreachable("no symbol table pointer!")::llvm::llvm_unreachable_internal("no symbol table pointer!",
 "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 147);
}
149}

151Expected<StringRef> COFFObjectFile::getSymbolName(DataRefImpl Ref) const {
return getSymbolName(getCOFFSymbol(Ref));
153}

155uint64_t COFFObjectFile::getSymbolValueImpl(DataRefImpl Ref) const {
return getCOFFSymbol(Ref).getValue();
157}

159uint32_t COFFObjectFile::getSymbolAlignment(DataRefImpl Ref) const {
// MSVC/link.exe seems to align symbols to the next-power-of-2
// up to 32 bytes.
COFFSymbolRef Symb = getCOFFSymbol(Ref);
return std::min(uint64_t(32), PowerOf2Ceil(Symb.getValue()));
164}

166Expected<uint64_t> COFFObjectFile::getSymbolAddress(DataRefImpl Ref) const {
uint64_t Result = cantFail(getSymbolValue(Ref));
COFFSymbolRef Symb = getCOFFSymbol(Ref);
int32_t SectionNumber = Symb.getSectionNumber();

if (Symb.isAnyUndefined() || Symb.isCommon() ||
    COFF::isReservedSectionNumber(SectionNumber))
  return Result;

Expected<const coff_section *> Section = getSection(SectionNumber);
if (!Section)
  return Section.takeError();
Result += (*Section)->VirtualAddress;

// The section VirtualAddress does not include ImageBase, and we want to
// return virtual addresses.
Result += getImageBase();

return Result;
185}

187Expected<SymbolRef::Type> COFFObjectFile::getSymbolType(DataRefImpl Ref) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
int32_t SectionNumber = Symb.getSectionNumber();

if (Symb.getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION)
  return SymbolRef::ST_Function;
if (Symb.isAnyUndefined())
  return SymbolRef::ST_Unknown;
if (Symb.isCommon())
  return SymbolRef::ST_Data;
if (Symb.isFileRecord())
  return SymbolRef::ST_File;

// TODO: perhaps we need a new symbol type ST_Section.
if (SectionNumber == COFF::IMAGE_SYM_DEBUG || Symb.isSectionDefinition())
  return SymbolRef::ST_Debug;

if (!COFF::isReservedSectionNumber(SectionNumber))
  return SymbolRef::ST_Data;

return SymbolRef::ST_Other;
208}

210Expected<uint32_t> COFFObjectFile::getSymbolFlags(DataRefImpl Ref) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
uint32_t Result = SymbolRef::SF_None;

if (Symb.isExternal() || Symb.isWeakExternal())
  Result |= SymbolRef::SF_Global;

if (const coff_aux_weak_external *AWE = Symb.getWeakExternal()) {
  Result |= SymbolRef::SF_Weak;
  if (AWE->Characteristics != COFF::IMAGE_WEAK_EXTERN_SEARCH_ALIAS)
    Result |= SymbolRef::SF_Undefined;
}

if (Symb.getSectionNumber() == COFF::IMAGE_SYM_ABSOLUTE)
  Result |= SymbolRef::SF_Absolute;

if (Symb.isFileRecord())
  Result |= SymbolRef::SF_FormatSpecific;

if (Symb.isSectionDefinition())
  Result |= SymbolRef::SF_FormatSpecific;

if (Symb.isCommon())
  Result |= SymbolRef::SF_Common;

if (Symb.isUndefined())
  Result |= SymbolRef::SF_Undefined;

return Result;
239}

241uint64_t COFFObjectFile::getCommonSymbolSizeImpl(DataRefImpl Ref) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
return Symb.getValue();
244}

246Expected<section_iterator>
247COFFObjectFile::getSymbolSection(DataRefImpl Ref) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
if (COFF::isReservedSectionNumber(Symb.getSectionNumber()))
  return section_end();
Expected<const coff_section *> Sec = getSection(Symb.getSectionNumber());
if (!Sec)
  return Sec.takeError();
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(*Sec);
return section_iterator(SectionRef(Ret, this));
257}

259unsigned COFFObjectFile::getSymbolSectionID(SymbolRef Sym) const {
COFFSymbolRef Symb = getCOFFSymbol(Sym.getRawDataRefImpl());
return Symb.getSectionNumber();
262}

264void COFFObjectFile::moveSectionNext(DataRefImpl &Ref) const {
const coff_section *Sec = toSec(Ref);
Sec += 1;
Ref.p = reinterpret_cast<uintptr_t>(Sec);
268}

270Expected<StringRef> COFFObjectFile::getSectionName(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return getSectionName(Sec);
273}

275uint64_t COFFObjectFile::getSectionAddress(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
uint64_t Result = Sec->VirtualAddress;

// The section VirtualAddress does not include ImageBase, and we want to
// return virtual addresses.
Result += getImageBase();
return Result;
283}

285uint64_t COFFObjectFile::getSectionIndex(DataRefImpl Sec) const {
return toSec(Sec) - SectionTable;
287}

289uint64_t COFFObjectFile::getSectionSize(DataRefImpl Ref) const {
return getSectionSize(toSec(Ref));
291}

293Expected<ArrayRef<uint8_t>>
294COFFObjectFile::getSectionContents(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
ArrayRef<uint8_t> Res;
if (Error E = getSectionContents(Sec, Res))
  return std::move(E);
return Res;
300}

302uint64_t COFFObjectFile::getSectionAlignment(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->getAlignment();
305}

307bool COFFObjectFile::isSectionCompressed(DataRefImpl Sec) const {
return false;
309}

311bool COFFObjectFile::isSectionText(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
314}

316bool COFFObjectFile::isSectionData(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
319}

321bool COFFObjectFile::isSectionBSS(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
const uint32_t BssFlags = COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
                          COFF::IMAGE_SCN_MEM_READ |
                          COFF::IMAGE_SCN_MEM_WRITE;
return (Sec->Characteristics & BssFlags) == BssFlags;
327}

329// The .debug sections are the only debug sections for COFF
330// (\see MCObjectFileInfo.cpp).
331bool COFFObjectFile::isDebugSection(StringRef SectionName) const {
return SectionName.startswith(".debug");
333}

335unsigned COFFObjectFile::getSectionID(SectionRef Sec) const {
uintptr_t Offset =
    Sec.getRawDataRefImpl().p - reinterpret_cast<uintptr_t>(SectionTable);
assert((Offset % sizeof(coff_section)) == 0)(static_cast <bool> ((Offset % sizeof(coff_section)) ==
 0) ? void (0) : __assert_fail ("(Offset % sizeof(coff_section)) == 0"
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 338, __extension__ __PRETTY_FUNCTION__));
return (Offset / sizeof(coff_section)) + 1;
340}

342bool COFFObjectFile::isSectionVirtual(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
// In COFF, a virtual section won't have any in-file
// content, so the file pointer to the content will be zero.
return Sec->PointerToRawData == 0;
347}

349static uint32_t getNumberOfRelocations(const coff_section *Sec,
                                     MemoryBufferRef M, const uint8_t *base) {
// The field for the number of relocations in COFF section table is only
// 16-bit wide. If a section has more than 65535 relocations, 0xFFFF is set to
// NumberOfRelocations field, and the actual relocation count is stored in the
// VirtualAddress field in the first relocation entry.
if (Sec->hasExtendedRelocations()) {
  const coff_relocation *FirstReloc;
  if (Error E = getObject(FirstReloc, M,
                          reinterpret_cast<const coff_relocation *>(
                              base + Sec->PointerToRelocations))) {
    consumeError(std::move(E));
    return 0;
  }
  // -1 to exclude this first relocation entry.
  return FirstReloc->VirtualAddress - 1;
}
return Sec->NumberOfRelocations;
367}

369static const coff_relocation *
370getFirstReloc(const coff_section *Sec, MemoryBufferRef M, const uint8_t *Base) {
uint64_t NumRelocs = getNumberOfRelocations(Sec, M, Base);
if (!NumRelocs)
  return nullptr;
auto begin = reinterpret_cast<const coff_relocation *>(
    Base + Sec->PointerToRelocations);
if (Sec->hasExtendedRelocations()) {
  // Skip the first relocation entry repurposed to store the number of
  // relocations.
  begin++;
}
if (auto E = Binary::checkOffset(M, reinterpret_cast<uintptr_t>(begin),
                                 sizeof(coff_relocation) * NumRelocs)) {
  consumeError(std::move(E));
  return nullptr;
}
return begin;
387}

389relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
const coff_relocation *begin = getFirstReloc(Sec, Data, base());
if (begin && Sec->VirtualAddress != 0)
  report_fatal_error("Sections with relocations should have an address of 0");
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(begin);
return relocation_iterator(RelocationRef(Ret, this));
397}

399relocation_iterator COFFObjectFile::section_rel_end(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
const coff_relocation *I = getFirstReloc(Sec, Data, base());
if (I)
  I += getNumberOfRelocations(Sec, Data, base());
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(I);
return relocation_iterator(RelocationRef(Ret, this));
407}

409// Initialize the pointer to the symbol table.
410Error COFFObjectFile::initSymbolTablePtr() {
if (COFFHeader)
  if (Error E = getObject(
          SymbolTable16, Data, base() + getPointerToSymbolTable(),
          (uint64_t)getNumberOfSymbols() * getSymbolTableEntrySize()))
    return E;

if (COFFBigObjHeader)
  if (Error E = getObject(
          SymbolTable32, Data, base() + getPointerToSymbolTable(),
          (uint64_t)getNumberOfSymbols() * getSymbolTableEntrySize()))
    return E;

// Find string table. The first four byte of the string table contains the
// total size of the string table, including the size field itself. If the
// string table is empty, the value of the first four byte would be 4.
uint32_t StringTableOffset = getPointerToSymbolTable() +
                             getNumberOfSymbols() * getSymbolTableEntrySize();
const uint8_t *StringTableAddr = base() + StringTableOffset;
const ulittle32_t *StringTableSizePtr;
if (Error E = getObject(StringTableSizePtr, Data, StringTableAddr))
  return E;
StringTableSize = *StringTableSizePtr;
if (Error E = getObject(StringTable, Data, StringTableAddr, StringTableSize))
  return E;

// Treat table sizes < 4 as empty because contrary to the PECOFF spec, some
// tools like cvtres write a size of 0 for an empty table instead of 4.
if (StringTableSize < 4)
  StringTableSize = 4;

// Check that the string table is null terminated if has any in it.
if (StringTableSize > 4 && StringTable[StringTableSize - 1] != 0)
  return errorCodeToError(object_error::parse_failed);
return Error::success();
445}

447uint64_t COFFObjectFile::getImageBase() const {
if (PE32Header)
  return PE32Header->ImageBase;
else if (PE32PlusHeader)
  return PE32PlusHeader->ImageBase;
// This actually comes up in practice.
return 0;
454}

456// Returns the file offset for the given VA.
457Error COFFObjectFile::getVaPtr(uint64_t Addr, uintptr_t &Res) const {
uint64_t ImageBase = getImageBase();
uint64_t Rva = Addr - ImageBase;
assert(Rva <= UINT32_MAX)(static_cast <bool> (Rva <= (4294967295U)) ? void (0
) : __assert_fail ("Rva <= UINT32_MAX", "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 460, __extension__ __PRETTY_FUNCTION__));
return getRvaPtr((uint32_t)Rva, Res);
462}

464// Returns the file offset for the given RVA.
465Error COFFObjectFile::getRvaPtr(uint32_t Addr, uintptr_t &Res) const {
for (const SectionRef &S : sections()) {
  const coff_section *Section = getCOFFSection(S);
  uint32_t SectionStart = Section->VirtualAddress;
  uint32_t SectionEnd = Section->VirtualAddress + Section->VirtualSize;
  if (SectionStart <= Addr && Addr < SectionEnd) {
    uint32_t Offset = Addr - SectionStart;
    Res = reinterpret_cast<uintptr_t>(base()) + Section->PointerToRawData +
          Offset;
    return Error::success();
  }
}
return errorCodeToError(object_error::parse_failed);
478}

480Error COFFObjectFile::getRvaAndSizeAsBytes(uint32_t RVA, uint32_t Size,
                                         ArrayRef<uint8_t> &Contents) const {
for (const SectionRef &S : sections()) {
  const coff_section *Section = getCOFFSection(S);
  uint32_t SectionStart = Section->VirtualAddress;
  // Check if this RVA is within the section bounds. Be careful about integer
  // overflow.
  uint32_t OffsetIntoSection = RVA - SectionStart;
  if (SectionStart <= RVA && OffsetIntoSection < Section->VirtualSize &&
      Size <= Section->VirtualSize - OffsetIntoSection) {
    uintptr_t Begin = reinterpret_cast<uintptr_t>(base()) +
                      Section->PointerToRawData + OffsetIntoSection;
    Contents =
        ArrayRef<uint8_t>(reinterpret_cast<const uint8_t *>(Begin), Size);
    return Error::success();
  }
}
return errorCodeToError(object_error::parse_failed);
498}

500// Returns hint and name fields, assuming \p Rva is pointing to a Hint/Name
501// table entry.
502Error COFFObjectFile::getHintName(uint32_t Rva, uint16_t &Hint,
                                StringRef &Name) const {
uintptr_t IntPtr = 0;
if (Error E = getRvaPtr(Rva, IntPtr))
  return E;
const uint8_t *Ptr = reinterpret_cast<const uint8_t *>(IntPtr);
Hint = *reinterpret_cast<const ulittle16_t *>(Ptr);
Name = StringRef(reinterpret_cast<const char *>(Ptr + 2));
return Error::success();
511}

513Error COFFObjectFile::getDebugPDBInfo(const debug_directory *DebugDir,
                                    const codeview::DebugInfo *&PDBInfo,
                                    StringRef &PDBFileName) const {
ArrayRef<uint8_t> InfoBytes;
if (Error E = getRvaAndSizeAsBytes(
        DebugDir->AddressOfRawData, DebugDir->SizeOfData, InfoBytes))
  return E;
if (InfoBytes.size() < sizeof(*PDBInfo) + 1)
  return errorCodeToError(object_error::parse_failed);
PDBInfo = reinterpret_cast<const codeview::DebugInfo *>(InfoBytes.data());
InfoBytes = InfoBytes.drop_front(sizeof(*PDBInfo));
PDBFileName = StringRef(reinterpret_cast<const char *>(InfoBytes.data()),
                        InfoBytes.size());
// Truncate the name at the first null byte. Ignore any padding.
PDBFileName = PDBFileName.split('\0').first;
return Error::success();
529}

531Error COFFObjectFile::getDebugPDBInfo(const codeview::DebugInfo *&PDBInfo,
                                    StringRef &PDBFileName) const {
for (const debug_directory &D : debug_directories())
  if (D.Type == COFF::IMAGE_DEBUG_TYPE_CODEVIEW)
    return getDebugPDBInfo(&D, PDBInfo, PDBFileName);
// If we get here, there is no PDB info to return.
PDBInfo = nullptr;
PDBFileName = StringRef();
return Error::success();
540}

542// Find the import table.
543Error COFFObjectFile::initImportTablePtr() {
// First, we get the RVA of the import table. If the file lacks a pointer to
// the import table, do nothing.
const data_directory *DataEntry = getDataDirectory(COFF::IMPORT_TABLE);
if (!DataEntry)
  return Error::success();

// Do nothing if the pointer to import table is NULL.
if (DataEntry->RelativeVirtualAddress == 0)
  return Error::success();

uint32_t ImportTableRva = DataEntry->RelativeVirtualAddress;

// Find the section that contains the RVA. This is needed because the RVA is
// the import table's memory address which is different from its file offset.
uintptr_t IntPtr = 0;
if (Error E = getRvaPtr(ImportTableRva, IntPtr))
  return E;
if (Error E = checkOffset(Data, IntPtr, DataEntry->Size))
  return E;
ImportDirectory = reinterpret_cast<
    const coff_import_directory_table_entry *>(IntPtr);
return Error::success();
566}

568// Initializes DelayImportDirectory and NumberOfDelayImportDirectory.
569Error COFFObjectFile::initDelayImportTablePtr() {
const data_directory *DataEntry =
    getDataDirectory(COFF::DELAY_IMPORT_DESCRIPTOR);
if (!DataEntry)
  return Error::success();
if (DataEntry->RelativeVirtualAddress == 0)
  return Error::success();

uint32_t RVA = DataEntry->RelativeVirtualAddress;
NumberOfDelayImportDirectory = DataEntry->Size /
    sizeof(delay_import_directory_table_entry) - 1;

uintptr_t IntPtr = 0;
if (Error E = getRvaPtr(RVA, IntPtr))
  return E;
DelayImportDirectory = reinterpret_cast<
    const delay_import_directory_table_entry *>(IntPtr);
return Error::success();
587}

589// Find the export table.
590Error COFFObjectFile::initExportTablePtr() {
// First, we get the RVA of the export table. If the file lacks a pointer to
// the export table, do nothing.
const data_directory *DataEntry = getDataDirectory(COFF::EXPORT_TABLE);
if (!DataEntry)
  return Error::success();

// Do nothing if the pointer to export table is NULL.
if (DataEntry->RelativeVirtualAddress == 0)
  return Error::success();

uint32_t ExportTableRva = DataEntry->RelativeVirtualAddress;
uintptr_t IntPtr = 0;
if (Error E = getRvaPtr(ExportTableRva, IntPtr))
  return E;
ExportDirectory =
    reinterpret_cast<const export_directory_table_entry *>(IntPtr);
return Error::success();
608}

610Error COFFObjectFile::initBaseRelocPtr() {
const data_directory *DataEntry =
    getDataDirectory(COFF::BASE_RELOCATION_TABLE);
if (!DataEntry)
  return Error::success();
if (DataEntry->RelativeVirtualAddress == 0)
  return Error::success();

uintptr_t IntPtr = 0;
if (Error E = getRvaPtr(DataEntry->RelativeVirtualAddress, IntPtr))
  return E;
BaseRelocHeader = reinterpret_cast<const coff_base_reloc_block_header *>(
    IntPtr);
BaseRelocEnd = reinterpret_cast<coff_base_reloc_block_header *>(
    IntPtr + DataEntry->Size);
// FIXME: Verify the section containing BaseRelocHeader has at least
// DataEntry->Size bytes after DataEntry->RelativeVirtualAddress.
return Error::success();
628}

630Error COFFObjectFile::initDebugDirectoryPtr() {
// Get the RVA of the debug directory. Do nothing if it does not exist.
const data_directory *DataEntry = getDataDirectory(COFF::DEBUG_DIRECTORY);
if (!DataEntry)
  return Error::success();

// Do nothing if the RVA is NULL.
if (DataEntry->RelativeVirtualAddress == 0)
  return Error::success();

// Check that the size is a multiple of the entry size.
if (DataEntry->Size % sizeof(debug_directory) != 0)
  return errorCodeToError(object_error::parse_failed);

uintptr_t IntPtr = 0;
if (Error E = getRvaPtr(DataEntry->RelativeVirtualAddress, IntPtr))
  return E;
DebugDirectoryBegin = reinterpret_cast<const debug_directory *>(IntPtr);
DebugDirectoryEnd = reinterpret_cast<const debug_directory *>(
    IntPtr + DataEntry->Size);
// FIXME: Verify the section containing DebugDirectoryBegin has at least
// DataEntry->Size bytes after DataEntry->RelativeVirtualAddress.
return Error::success();
653}

655Error COFFObjectFile::initTLSDirectoryPtr() {
// Get the RVA of the TLS directory. Do nothing if it does not exist.
const data_directory *DataEntry = getDataDirectory(COFF::TLS_TABLE);
if (!DataEntry)
  return Error::success();

// Do nothing if the RVA is NULL.
if (DataEntry->RelativeVirtualAddress == 0)
  return Error::success();

uint64_t DirSize =
    is64() ? sizeof(coff_tls_directory64) : sizeof(coff_tls_directory32);

// Check that the size is correct.
if (DataEntry->Size != DirSize)
  return createStringError(
      object_error::parse_failed,
      "TLS Directory size (%u) is not the expected size (%" PRIu64"l" "u" ").",
      static_cast<uint32_t>(DataEntry->Size), DirSize);

uintptr_t IntPtr = 0;
if (Error E = getRvaPtr(DataEntry->RelativeVirtualAddress, IntPtr))
  return E;

if (is64())
  TLSDirectory64 = reinterpret_cast<const coff_tls_directory64 *>(IntPtr);
else
  TLSDirectory32 = reinterpret_cast<const coff_tls_directory32 *>(IntPtr);

return Error::success();
685}

687Error COFFObjectFile::initLoadConfigPtr() {
// Get the RVA of the debug directory. Do nothing if it does not exist.
const data_directory *DataEntry = getDataDirectory(COFF::LOAD_CONFIG_TABLE);
if (!DataEntry)
  return Error::success();

// Do nothing if the RVA is NULL.
if (DataEntry->RelativeVirtualAddress == 0)
  return Error::success();
uintptr_t IntPtr = 0;
if (Error E = getRvaPtr(DataEntry->RelativeVirtualAddress, IntPtr))
  return E;

LoadConfig = (const void *)IntPtr;
return Error::success();
702}

704Expected<std::unique_ptr<COFFObjectFile>>
705COFFObjectFile::create(MemoryBufferRef Object) {
std::unique_ptr<COFFObjectFile> Obj(new COFFObjectFile(std::move(Object)));
if (Error E = Obj->initialize())
  return std::move(E);
return std::move(Obj);
710}

712COFFObjectFile::COFFObjectFile(MemoryBufferRef Object)
  : ObjectFile(Binary::ID_COFF, Object), COFFHeader(nullptr),
    COFFBigObjHeader(nullptr), PE32Header(nullptr), PE32PlusHeader(nullptr),
    DataDirectory(nullptr), SectionTable(nullptr), SymbolTable16(nullptr),
    SymbolTable32(nullptr), StringTable(nullptr), StringTableSize(0),
    ImportDirectory(nullptr), DelayImportDirectory(nullptr),
    NumberOfDelayImportDirectory(0), ExportDirectory(nullptr),
    BaseRelocHeader(nullptr), BaseRelocEnd(nullptr),
    DebugDirectoryBegin(nullptr), DebugDirectoryEnd(nullptr),
    TLSDirectory32(nullptr), TLSDirectory64(nullptr) {}

723Error COFFObjectFile::initialize() {
// Check that we at least have enough room for a header.
std::error_code EC;
if (!checkSize(Data, EC, sizeof(coff_file_header)))
  return errorCodeToError(EC);

// The current location in the file where we are looking at.
uint64_t CurPtr = 0;

// PE header is optional and is present only in executables. If it exists,
// it is placed right after COFF header.
bool HasPEHeader = false;

// Check if this is a PE/COFF file.
if (checkSize(Data, EC, sizeof(dos_header) + sizeof(COFF::PEMagic))) {
  // PE/COFF, seek through MS-DOS compatibility stub and 4-byte
  // PE signature to find 'normal' COFF header.
  const auto *DH = reinterpret_cast<const dos_header *>(base());
  if (DH->Magic[0] == 'M' && DH->Magic[1] == 'Z') {
    CurPtr = DH->AddressOfNewExeHeader;
    // Check the PE magic bytes. ("PE\0\0")
    if (memcmp(base() + CurPtr, COFF::PEMagic, sizeof(COFF::PEMagic)) != 0) {
      return errorCodeToError(object_error::parse_failed);
    }
    CurPtr += sizeof(COFF::PEMagic); // Skip the PE magic bytes.
    HasPEHeader = true;
  }
}

if (Error E = getObject(COFFHeader, Data, base() + CurPtr))
  return E;

// It might be a bigobj file, let's check.  Note that COFF bigobj and COFF
// import libraries share a common prefix but bigobj is more restrictive.
if (!HasPEHeader && COFFHeader->Machine == COFF::IMAGE_FILE_MACHINE_UNKNOWN &&
    COFFHeader->NumberOfSections == uint16_t(0xffff) &&
    checkSize(Data, EC, sizeof(coff_bigobj_file_header))) {
  if (Error E = getObject(COFFBigObjHeader, Data, base() + CurPtr))
    return E;

  // Verify that we are dealing with bigobj.
  if (COFFBigObjHeader->Version >= COFF::BigObjHeader::MinBigObjectVersion &&
      std::memcmp(COFFBigObjHeader->UUID, COFF::BigObjMagic,
                  sizeof(COFF::BigObjMagic)) == 0) {
    COFFHeader = nullptr;
    CurPtr += sizeof(coff_bigobj_file_header);
  } else {
    // It's not a bigobj.
    COFFBigObjHeader = nullptr;
  }
}
if (COFFHeader) {
  // The prior checkSize call may have failed.  This isn't a hard error
  // because we were just trying to sniff out bigobj.
  EC = std::error_code();
  CurPtr += sizeof(coff_file_header);

  if (COFFHeader->isImportLibrary())
    return errorCodeToError(EC);
}

if (HasPEHeader) {
  const pe32_header *Header;
  if (Error E = getObject(Header, Data, base() + CurPtr))
    return E;

  const uint8_t *DataDirAddr;
  uint64_t DataDirSize;
  if (Header->Magic == COFF::PE32Header::PE32) {
    PE32Header = Header;
    DataDirAddr = base() + CurPtr + sizeof(pe32_header);
    DataDirSize = sizeof(data_directory) * PE32Header->NumberOfRvaAndSize;
  } else if (Header->Magic == COFF::PE32Header::PE32_PLUS) {
    PE32PlusHeader = reinterpret_cast<const pe32plus_header *>(Header);
    DataDirAddr = base() + CurPtr + sizeof(pe32plus_header);
    DataDirSize = sizeof(data_directory) * PE32PlusHeader->NumberOfRvaAndSize;
  } else {
    // It's neither PE32 nor PE32+.
    return errorCodeToError(object_error::parse_failed);
  }
  if (Error E = getObject(DataDirectory, Data, DataDirAddr, DataDirSize))
    return E;
}

if (COFFHeader)
  CurPtr += COFFHeader->SizeOfOptionalHeader;

assert(COFFHeader || COFFBigObjHeader)(static_cast <bool> (COFFHeader || COFFBigObjHeader) ? void
 (0) : __assert_fail ("COFFHeader || COFFBigObjHeader", "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 810, __extension__ __PRETTY_FUNCTION__));

if (Error E =
        getObject(SectionTable, Data, base() + CurPtr,
                  (uint64_t)getNumberOfSections() * sizeof(coff_section)))
  return E;

// Initialize the pointer to the symbol table.
if (getPointerToSymbolTable() != 0) {
  if (Error E = initSymbolTablePtr()) {
    // Recover from errors reading the symbol table.
    consumeError(std::move(E));
    SymbolTable16 = nullptr;
    SymbolTable32 = nullptr;
    StringTable = nullptr;
    StringTableSize = 0;
  }
} else {
  // We had better not have any symbols if we don't have a symbol table.
  if (getNumberOfSymbols() != 0) {
    return errorCodeToError(object_error::parse_failed);
  }
}

// Initialize the pointer to the beginning of the import table.
if (Error E = initImportTablePtr())
  return E;
if (Error E = initDelayImportTablePtr())
  return E;

// Initialize the pointer to the export table.
if (Error E = initExportTablePtr())
  return E;

// Initialize the pointer to the base relocation table.
if (Error E = initBaseRelocPtr())
  return E;

// Initialize the pointer to the debug directory.
if (Error E = initDebugDirectoryPtr())
  return E;

// Initialize the pointer to the TLS directory.
if (Error E = initTLSDirectoryPtr())
  return E;

if (Error E = initLoadConfigPtr())
  return E;

return Error::success();
860}

862basic_symbol_iterator COFFObjectFile::symbol_begin() const {
DataRefImpl Ret;
Ret.p = getSymbolTable();
return basic_symbol_iterator(SymbolRef(Ret, this));
866}

868basic_symbol_iterator COFFObjectFile::symbol_end() const {
// The symbol table ends where the string table begins.
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(StringTable);
return basic_symbol_iterator(SymbolRef(Ret, this));
873}

875import_directory_iterator COFFObjectFile::import_directory_begin() const {
if (!ImportDirectory)
  return import_directory_end();
if (ImportDirectory->isNull())
  return import_directory_end();
return import_directory_iterator(
    ImportDirectoryEntryRef(ImportDirectory, 0, this));
882}

884import_directory_iterator COFFObjectFile::import_directory_end() const {
return import_directory_iterator(
    ImportDirectoryEntryRef(nullptr, -1, this));
887}

889delay_import_directory_iterator
890COFFObjectFile::delay_import_directory_begin() const {
return delay_import_directory_iterator(
    DelayImportDirectoryEntryRef(DelayImportDirectory, 0, this));
893}

895delay_import_directory_iterator
896COFFObjectFile::delay_import_directory_end() const {
return delay_import_directory_iterator(
    DelayImportDirectoryEntryRef(
        DelayImportDirectory, NumberOfDelayImportDirectory, this));
900}

902export_directory_iterator COFFObjectFile::export_directory_begin() const {
return export_directory_iterator(
    ExportDirectoryEntryRef(ExportDirectory, 0, this));
905}

907export_directory_iterator COFFObjectFile::export_directory_end() const {
if (!ExportDirectory)
  return export_directory_iterator(ExportDirectoryEntryRef(nullptr, 0, this));
ExportDirectoryEntryRef Ref(ExportDirectory,
                            ExportDirectory->AddressTableEntries, this);
return export_directory_iterator(Ref);
913}

915section_iterator COFFObjectFile::section_begin() const {
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(SectionTable);
return section_iterator(SectionRef(Ret, this));
919}

921section_iterator COFFObjectFile::section_end() const {
DataRefImpl Ret;
int NumSections =
    COFFHeader && COFFHeader->isImportLibrary() ? 0 : getNumberOfSections();
Ret.p = reinterpret_cast<uintptr_t>(SectionTable + NumSections);
return section_iterator(SectionRef(Ret, this));
927}

929base_reloc_iterator COFFObjectFile::base_reloc_begin() const {
return base_reloc_iterator(BaseRelocRef(BaseRelocHeader, this));
931}

933base_reloc_iterator COFFObjectFile::base_reloc_end() const {
return base_reloc_iterator(BaseRelocRef(BaseRelocEnd, this));
935}

937uint8_t COFFObjectFile::getBytesInAddress() const {
return getArch() == Triple::x86_64 || getArch() == Triple::aarch64 ? 8 : 4;
939}

941StringRef COFFObjectFile::getFileFormatName() const {
switch(getMachine()) {
case COFF::IMAGE_FILE_MACHINE_I386:
  return "COFF-i386";
case COFF::IMAGE_FILE_MACHINE_AMD64:
  return "COFF-x86-64";
case COFF::IMAGE_FILE_MACHINE_ARMNT:
  return "COFF-ARM";
case COFF::IMAGE_FILE_MACHINE_ARM64:
  return "COFF-ARM64";
default:
  return "COFF-<unknown arch>";
}
954}

956Triple::ArchType COFFObjectFile::getArch() const {
switch (getMachine()) {
case COFF::IMAGE_FILE_MACHINE_I386:
  return Triple::x86;
case COFF::IMAGE_FILE_MACHINE_AMD64:
  return Triple::x86_64;
case COFF::IMAGE_FILE_MACHINE_ARMNT:
  return Triple::thumb;
case COFF::IMAGE_FILE_MACHINE_ARM64:
  return Triple::aarch64;
default:
  return Triple::UnknownArch;
}
969}

971Expected<uint64_t> COFFObjectFile::getStartAddress() const {
if (PE32Header)
  return PE32Header->AddressOfEntryPoint;
return 0;
975}

977iterator_range<import_directory_iterator>
978COFFObjectFile::import_directories() const {
return make_range(import_directory_begin(), import_directory_end());
980}

982iterator_range<delay_import_directory_iterator>
983COFFObjectFile::delay_import_directories() const {
return make_range(delay_import_directory_begin(),
                  delay_import_directory_end());
986}

988iterator_range<export_directory_iterator>
989COFFObjectFile::export_directories() const {
return make_range(export_directory_begin(), export_directory_end());
991}

993iterator_range<base_reloc_iterator> COFFObjectFile::base_relocs() const {
return make_range(base_reloc_begin(), base_reloc_end());
995}

997const data_directory *COFFObjectFile::getDataDirectory(uint32_t Index) const {
if (!DataDirectory)
  return nullptr;
assert(PE32Header || PE32PlusHeader)(static_cast <bool> (PE32Header || PE32PlusHeader) ? void
 (0) : __assert_fail ("PE32Header || PE32PlusHeader", "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1000, __extension__ __PRETTY_FUNCTION__));
uint32_t NumEnt = PE32Header ? PE32Header->NumberOfRvaAndSize
                             : PE32PlusHeader->NumberOfRvaAndSize;
if (Index >= NumEnt)
  return nullptr;
return &DataDirectory[Index];
1006}

1008Expected<const coff_section *> COFFObjectFile::getSection(int32_t Index) const {
// Perhaps getting the section of a reserved section index should be an error,
// but callers rely on this to return null.
if (COFF::isReservedSectionNumber(Index))
  return (const coff_section *)nullptr;
if (static_cast<uint32_t>(Index) <= getNumberOfSections()) {
  // We already verified the section table data, so no need to check again.
  return SectionTable + (Index - 1);
}
return errorCodeToError(object_error::parse_failed);
1018}

1020Expected<StringRef> COFFObjectFile::getString(uint32_t Offset) const {
if (StringTableSize <= 4)
  // Tried to get a string from an empty string table.
  return errorCodeToError(object_error::parse_failed);
if (Offset >= StringTableSize)
  return errorCodeToError(object_error::unexpected_eof);
return StringRef(StringTable + Offset);
1027}

1029Expected<StringRef> COFFObjectFile::getSymbolName(COFFSymbolRef Symbol) const {
return getSymbolName(Symbol.getGeneric());
1031}

1033Expected<StringRef>
1034COFFObjectFile::getSymbolName(const coff_symbol_generic *Symbol) const {
// Check for string table entry. First 4 bytes are 0.
if (Symbol->Name.Offset.Zeroes == 0)
  return getString(Symbol->Name.Offset.Offset);

// Null terminated, let ::strlen figure out the length.
if (Symbol->Name.ShortName[COFF::NameSize - 1] == 0)
  return StringRef(Symbol->Name.ShortName);

// Not null terminated, use all 8 bytes.
return StringRef(Symbol->Name.ShortName, COFF::NameSize);
1045}

1047ArrayRef<uint8_t>
1048COFFObjectFile::getSymbolAuxData(COFFSymbolRef Symbol) const {
const uint8_t *Aux = nullptr;

size_t SymbolSize = getSymbolTableEntrySize();
if (Symbol.getNumberOfAuxSymbols() > 0) {
  // AUX data comes immediately after the symbol in COFF
  Aux = reinterpret_cast<const uint8_t *>(Symbol.getRawPtr()) + SymbolSize;
1055#ifndef NDEBUG
  // Verify that the Aux symbol points to a valid entry in the symbol table.
  uintptr_t Offset = uintptr_t(Aux) - uintptr_t(base());
  if (Offset < getPointerToSymbolTable() ||
      Offset >=
          getPointerToSymbolTable() + (getNumberOfSymbols() * SymbolSize))
    report_fatal_error("Aux Symbol data was outside of symbol table.");

  assert((Offset - getPointerToSymbolTable()) % SymbolSize == 0 &&(static_cast <bool> ((Offset - getPointerToSymbolTable(
)) % SymbolSize == 0 && "Aux Symbol data did not point to the beginning of a symbol"
) ? void (0) : __assert_fail ("(Offset - getPointerToSymbolTable()) % SymbolSize == 0 && \"Aux Symbol data did not point to the beginning of a symbol\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1064, __extension__ __PRETTY_FUNCTION__))
         "Aux Symbol data did not point to the beginning of a symbol")(static_cast <bool> ((Offset - getPointerToSymbolTable(
)) % SymbolSize == 0 && "Aux Symbol data did not point to the beginning of a symbol"
) ? void (0) : __assert_fail ("(Offset - getPointerToSymbolTable()) % SymbolSize == 0 && \"Aux Symbol data did not point to the beginning of a symbol\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1064, __extension__ __PRETTY_FUNCTION__));
1065#endif
}
return makeArrayRef(Aux, Symbol.getNumberOfAuxSymbols() * SymbolSize);
1068}

1070uint32_t COFFObjectFile::getSymbolIndex(COFFSymbolRef Symbol) const {
uintptr_t Offset =
    reinterpret_cast<uintptr_t>(Symbol.getRawPtr()) - getSymbolTable();
assert(Offset % getSymbolTableEntrySize() == 0 &&(static_cast <bool> (Offset % getSymbolTableEntrySize()
 == 0 && "Symbol did not point to the beginning of a symbol"
) ? void (0) : __assert_fail ("Offset % getSymbolTableEntrySize() == 0 && \"Symbol did not point to the beginning of a symbol\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1074, __extension__ __PRETTY_FUNCTION__))
       "Symbol did not point to the beginning of a symbol")(static_cast <bool> (Offset % getSymbolTableEntrySize()
 == 0 && "Symbol did not point to the beginning of a symbol"
) ? void (0) : __assert_fail ("Offset % getSymbolTableEntrySize() == 0 && \"Symbol did not point to the beginning of a symbol\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1074, __extension__ __PRETTY_FUNCTION__));
size_t Index = Offset / getSymbolTableEntrySize();
assert(Index < getNumberOfSymbols())(static_cast <bool> (Index < getNumberOfSymbols()) ?
 void (0) : __assert_fail ("Index < getNumberOfSymbols()",
 "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1076, __extension__ __PRETTY_FUNCTION__));
return Index;
1078}

1080Expected<StringRef>
1081COFFObjectFile::getSectionName(const coff_section *Sec) const {
StringRef Name;
if (Sec->Name[COFF::NameSize - 1] == 0)
  // Null terminated, let ::strlen figure out the length.
  Name = Sec->Name;
else
  // Not null terminated, use all 8 bytes.
  Name = StringRef(Sec->Name, COFF::NameSize);

// Check for string table entry. First byte is '/'.
if (Name.startswith("/")) {
  uint32_t Offset;
  if (Name.startswith("//")) {
    if (decodeBase64StringEntry(Name.substr(2), Offset))
      return createStringError(object_error::parse_failed,
                               "invalid section name");
  } else {
    if (Name.substr(1).getAsInteger(10, Offset))
      return createStringError(object_error::parse_failed,
                               "invalid section name");
  }
  return getString(Offset);
}

return Name;
1106}

1108uint64_t COFFObjectFile::getSectionSize(const coff_section *Sec) const {
// SizeOfRawData and VirtualSize change what they represent depending on
// whether or not we have an executable image.
//
// For object files, SizeOfRawData contains the size of section's data;
// VirtualSize should be zero but isn't due to buggy COFF writers.
//
// For executables, SizeOfRawData *must* be a multiple of FileAlignment; the
// actual section size is in VirtualSize.  It is possible for VirtualSize to
// be greater than SizeOfRawData; the contents past that point should be
// considered to be zero.
if (getDOSHeader())
  return std::min(Sec->VirtualSize, Sec->SizeOfRawData);
return Sec->SizeOfRawData;
1122}

1124Error COFFObjectFile::getSectionContents(const coff_section *Sec,
                                       ArrayRef<uint8_t> &Res) const {
// In COFF, a virtual section won't have any in-file
// content, so the file pointer to the content will be zero.
if (Sec->PointerToRawData == 0)
  return Error::success();
// The only thing that we need to verify is that the contents is contained
// within the file bounds. We don't need to make sure it doesn't cover other
// data, as there's nothing that says that is not allowed.
uintptr_t ConStart =
    reinterpret_cast<uintptr_t>(base()) + Sec->PointerToRawData;
uint32_t SectionSize = getSectionSize(Sec);
if (Error E = checkOffset(Data, ConStart, SectionSize))
  return E;
Res = makeArrayRef(reinterpret_cast<const uint8_t *>(ConStart), SectionSize);
return Error::success();
1140}

1142const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
return reinterpret_cast<const coff_relocation*>(Rel.p);
1144}

1146void COFFObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
Rel.p = reinterpret_cast<uintptr_t>(
          reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
1149}

1151uint64_t COFFObjectFile::getRelocationOffset(DataRefImpl Rel) const {
const coff_relocation *R = toRel(Rel);
return R->VirtualAddress;
1154}

1156symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
const coff_relocation *R = toRel(Rel);
DataRefImpl Ref;
if (R->SymbolTableIndex >= getNumberOfSymbols())
  return symbol_end();
if (SymbolTable16)
  Ref.p = reinterpret_cast<uintptr_t>(SymbolTable16 + R->SymbolTableIndex);
else if (SymbolTable32)
  Ref.p = reinterpret_cast<uintptr_t>(SymbolTable32 + R->SymbolTableIndex);
else
  llvm_unreachable("no symbol table pointer!")::llvm::llvm_unreachable_internal("no symbol table pointer!",
 "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1166);
return symbol_iterator(SymbolRef(Ref, this));
1168}

1170uint64_t COFFObjectFile::getRelocationType(DataRefImpl Rel) const {
const coff_relocation* R = toRel(Rel);
return R->Type;
1173}

1175const coff_section *
1176COFFObjectFile::getCOFFSection(const SectionRef &Section) const {
return toSec(Section.getRawDataRefImpl());
1178}

1180COFFSymbolRef COFFObjectFile::getCOFFSymbol(const DataRefImpl &Ref) const {
if (SymbolTable16)
  return toSymb<coff_symbol16>(Ref);
if (SymbolTable32)
  return toSymb<coff_symbol32>(Ref);
llvm_unreachable("no symbol table pointer!")::llvm::llvm_unreachable_internal("no symbol table pointer!",
 "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1185);
1186}

1188COFFSymbolRef COFFObjectFile::getCOFFSymbol(const SymbolRef &Symbol) const {
return getCOFFSymbol(Symbol.getRawDataRefImpl());
1190}

1192const coff_relocation *
1193COFFObjectFile::getCOFFRelocation(const RelocationRef &Reloc) const {
return toRel(Reloc.getRawDataRefImpl());
1195}

1197ArrayRef<coff_relocation>
1198COFFObjectFile::getRelocations(const coff_section *Sec) const {
return {getFirstReloc(Sec, Data, base()),
        getNumberOfRelocations(Sec, Data, base())};
1201}

1203#define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(reloc_type)                           \
case COFF::reloc_type:                                                       \
  return #reloc_type;

1207StringRef COFFObjectFile::getRelocationTypeName(uint16_t Type) const {
switch (getMachine()) {
case COFF::IMAGE_FILE_MACHINE_AMD64:
  switch (Type) {
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ABSOLUTE);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR64);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_ADDR32NB);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_1);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_2);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_3);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_4);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_REL32_5);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECTION);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SECREL7);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_TOKEN);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SREL32);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_PAIR);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_AMD64_SSPAN32);
  default:
    return "Unknown";
  }
  break;
case COFF::IMAGE_FILE_MACHINE_ARMNT:
  switch (Type) {
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_ABSOLUTE);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_ADDR32);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_ADDR32NB);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BRANCH24);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BRANCH11);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_TOKEN);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BLX24);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BLX11);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_REL32);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_SECTION);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_SECREL);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_MOV32A);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_MOV32T);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BRANCH20T);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BRANCH24T);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_BLX23T);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM_PAIR);
  default:
    return "Unknown";
  }
  break;
case COFF::IMAGE_FILE_MACHINE_ARM64:
  switch (Type) {
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_ABSOLUTE);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_ADDR32);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_ADDR32NB);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_BRANCH26);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_PAGEBASE_REL21);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_REL21);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_PAGEOFFSET_12A);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_PAGEOFFSET_12L);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_SECREL);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_SECREL_LOW12A);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_SECREL_HIGH12A);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_SECREL_LOW12L);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_TOKEN);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_SECTION);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_ADDR64);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_BRANCH19);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_BRANCH14);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_ARM64_REL32);
  default:
    return "Unknown";
  }
  break;
case COFF::IMAGE_FILE_MACHINE_I386:
  switch (Type) {
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_ABSOLUTE);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR16);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL16);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_DIR32NB);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SEG12);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECTION);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_TOKEN);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_SECREL7);
  LLVM_COFF_SWITCH_RELOC_TYPE_NAME(IMAGE_REL_I386_REL32);
  default:
    return "Unknown";
  }
  break;
default:
  return "Unknown";
}
1299}

1301#undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME

1303void COFFObjectFile::getRelocationTypeName(
  DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
const coff_relocation *Reloc = toRel(Rel);
StringRef Res = getRelocationTypeName(Reloc->Type);
Result.append(Res.begin(), Res.end());
1308}

1310bool COFFObjectFile::isRelocatableObject() const {
return !DataDirectory;
1312}

1314StringRef COFFObjectFile::mapDebugSectionName(StringRef Name) const {
return StringSwitch<StringRef>(Name)
    .Case("eh_fram", "eh_frame")
    .Default(Name);
1318}

1320bool ImportDirectoryEntryRef::
1321operator==(const ImportDirectoryEntryRef &Other) const {
return ImportTable == Other.ImportTable && Index == Other.Index;
1323}

1325void ImportDirectoryEntryRef::moveNext() {
++Index;
if (ImportTable[Index].isNull()) {
  Index = -1;
  ImportTable = nullptr;
}
1331}

1333Error ImportDirectoryEntryRef::getImportTableEntry(
  const coff_import_directory_table_entry *&Result) const {
return getObject(Result, OwningObject->Data, ImportTable + Index);
1336}

1338static imported_symbol_iterator
1339makeImportedSymbolIterator(const COFFObjectFile *Object,
                         uintptr_t Ptr, int Index) {
if (Object->getBytesInAddress() == 4) {
  auto *P = reinterpret_cast<const import_lookup_table_entry32 *>(Ptr);
  return imported_symbol_iterator(ImportedSymbolRef(P, Index, Object));
}
auto *P = reinterpret_cast<const import_lookup_table_entry64 *>(Ptr);
return imported_symbol_iterator(ImportedSymbolRef(P, Index, Object));
1347}

1349static imported_symbol_iterator
1350importedSymbolBegin(uint32_t RVA, const COFFObjectFile *Object) {
uintptr_t IntPtr = 0;
// FIXME: Handle errors.
cantFail(Object->getRvaPtr(RVA, IntPtr));
return makeImportedSymbolIterator(Object, IntPtr, 0);
1355}

1357static imported_symbol_iterator
1358importedSymbolEnd(uint32_t RVA, const COFFObjectFile *Object) {
uintptr_t IntPtr = 0;
// FIXME: Handle errors.
cantFail(Object->getRvaPtr(RVA, IntPtr));
// Forward the pointer to the last entry which is null.
int Index = 0;
if (Object->getBytesInAddress() == 4) {
  auto *Entry = reinterpret_cast<ulittle32_t *>(IntPtr);
  while (*Entry++)
    ++Index;
} else {
  auto *Entry = reinterpret_cast<ulittle64_t *>(IntPtr);
  while (*Entry++)
    ++Index;
}
return makeImportedSymbolIterator(Object, IntPtr, Index);
1374}

1376imported_symbol_iterator
1377ImportDirectoryEntryRef::imported_symbol_begin() const {
return importedSymbolBegin(ImportTable[Index].ImportAddressTableRVA,
                           OwningObject);
1380}

1382imported_symbol_iterator
1383ImportDirectoryEntryRef::imported_symbol_end() const {
return importedSymbolEnd(ImportTable[Index].ImportAddressTableRVA,
                         OwningObject);
1386}

1388iterator_range<imported_symbol_iterator>
1389ImportDirectoryEntryRef::imported_symbols() const {
return make_range(imported_symbol_begin(), imported_symbol_end());
1391}

1393imported_symbol_iterator ImportDirectoryEntryRef::lookup_table_begin() const {
return importedSymbolBegin(ImportTable[Index].ImportLookupTableRVA,
                           OwningObject);
1396}

1398imported_symbol_iterator ImportDirectoryEntryRef::lookup_table_end() const {
return importedSymbolEnd(ImportTable[Index].ImportLookupTableRVA,
                         OwningObject);
1401}

1403iterator_range<imported_symbol_iterator>
1404ImportDirectoryEntryRef::lookup_table_symbols() const {
return make_range(lookup_table_begin(), lookup_table_end());
1406}

1408Error ImportDirectoryEntryRef::getName(StringRef &Result) const {
uintptr_t IntPtr = 0;
if (Error E = OwningObject->getRvaPtr(ImportTable[Index].NameRVA, IntPtr))
  return E;
Result = StringRef(reinterpret_cast<const char *>(IntPtr));
return Error::success();
1414}

1416Error
1417ImportDirectoryEntryRef::getImportLookupTableRVA(uint32_t  &Result) const {
Result = ImportTable[Index].ImportLookupTableRVA;
return Error::success();
1420}

1422Error ImportDirectoryEntryRef::getImportAddressTableRVA(
  uint32_t &Result) const {
Result = ImportTable[Index].ImportAddressTableRVA;
return Error::success();
1426}

1428bool DelayImportDirectoryEntryRef::
1429operator==(const DelayImportDirectoryEntryRef &Other) const {
return Table == Other.Table && Index == Other.Index;
1431}

1433void DelayImportDirectoryEntryRef::moveNext() {
++Index;
1435}

1437imported_symbol_iterator
1438DelayImportDirectoryEntryRef::imported_symbol_begin() const {
return importedSymbolBegin(Table[Index].DelayImportNameTable,
                           OwningObject);
1441}

1443imported_symbol_iterator
1444DelayImportDirectoryEntryRef::imported_symbol_end() const {
return importedSymbolEnd(Table[Index].DelayImportNameTable,
                         OwningObject);
1447}

1449iterator_range<imported_symbol_iterator>
1450DelayImportDirectoryEntryRef::imported_symbols() const {
return make_range(imported_symbol_begin(), imported_symbol_end());
1452}

1454Error DelayImportDirectoryEntryRef::getName(StringRef &Result) const {
uintptr_t IntPtr = 0;
if (Error E = OwningObject->getRvaPtr(Table[Index].Name, IntPtr))
  return E;
Result = StringRef(reinterpret_cast<const char *>(IntPtr));
return Error::success();
1460}

1462Error DelayImportDirectoryEntryRef::getDelayImportTable(
  const delay_import_directory_table_entry *&Result) const {
Result = &Table[Index];
return Error::success();
1466}

1468Error DelayImportDirectoryEntryRef::getImportAddress(int AddrIndex,
                                                   uint64_t &Result) const {
uint32_t RVA = Table[Index].DelayImportAddressTable +
    AddrIndex * (OwningObject->is64() ? 8 : 4);
uintptr_t IntPtr = 0;
if (Error E = OwningObject->getRvaPtr(RVA, IntPtr))
  return E;
if (OwningObject->is64())
  Result = *reinterpret_cast<const ulittle64_t *>(IntPtr);
else
  Result = *reinterpret_cast<const ulittle32_t *>(IntPtr);
return Error::success();
1480}

1482bool ExportDirectoryEntryRef::
1483operator==(const ExportDirectoryEntryRef &Other) const {
return ExportTable == Other.ExportTable && Index == Other.Index;
1485}

1487void ExportDirectoryEntryRef::moveNext() {
++Index;
1489}

1491// Returns the name of the current export symbol. If the symbol is exported only
1492// by ordinal, the empty string is set as a result.
1493Error ExportDirectoryEntryRef::getDllName(StringRef &Result) const {
uintptr_t IntPtr = 0;
if (Error E = OwningObject->getRvaPtr(ExportTable->NameRVA, IntPtr))
  return E;
Result = StringRef(reinterpret_cast<const char *>(IntPtr));
return Error::success();
1499}

1501// Returns the starting ordinal number.
1502Error ExportDirectoryEntryRef::getOrdinalBase(uint32_t &Result) const {
Result = ExportTable->OrdinalBase;
return Error::success();
1505}

1507// Returns the export ordinal of the current export symbol.
1508Error ExportDirectoryEntryRef::getOrdinal(uint32_t &Result) const {
Result = ExportTable->OrdinalBase + Index;
return Error::success();
1511}

1513// Returns the address of the current export symbol.
1514Error ExportDirectoryEntryRef::getExportRVA(uint32_t &Result) const {
uintptr_t IntPtr = 0;
if (Error EC =
        OwningObject->getRvaPtr(ExportTable->ExportAddressTableRVA, IntPtr))
  return EC;
const export_address_table_entry *entry =
    reinterpret_cast<const export_address_table_entry *>(IntPtr);
Result = entry[Index].ExportRVA;
return Error::success();
1523}

1525// Returns the name of the current export symbol. If the symbol is exported only
1526// by ordinal, the empty string is set as a result.
1527Error
1528ExportDirectoryEntryRef::getSymbolName(StringRef &Result) const {
uintptr_t IntPtr = 0;
if (Error EC =
        OwningObject->getRvaPtr(ExportTable->OrdinalTableRVA, IntPtr))
  return EC;
const ulittle16_t *Start = reinterpret_cast<const ulittle16_t *>(IntPtr);

uint32_t NumEntries = ExportTable->NumberOfNamePointers;
int Offset = 0;
for (const ulittle16_t *I = Start, *E = Start + NumEntries;
     I < E; ++I, ++Offset) {
  if (*I != Index)
    continue;
  if (Error EC =
          OwningObject->getRvaPtr(ExportTable->NamePointerRVA, IntPtr))
    return EC;
  const ulittle32_t *NamePtr = reinterpret_cast<const ulittle32_t *>(IntPtr);
  if (Error EC = OwningObject->getRvaPtr(NamePtr[Offset], IntPtr))
    return EC;
  Result = StringRef(reinterpret_cast<const char *>(IntPtr));
  return Error::success();
}
Result = "";
return Error::success();
1552}

1554Error ExportDirectoryEntryRef::isForwarder(bool &Result) const {
const data_directory *DataEntry =
    OwningObject->getDataDirectory(COFF::EXPORT_TABLE);
if (!DataEntry)
  return errorCodeToError(object_error::parse_failed);
uint32_t RVA;
if (auto EC = getExportRVA(RVA))
  return EC;
uint32_t Begin = DataEntry->RelativeVirtualAddress;
uint32_t End = DataEntry->RelativeVirtualAddress + DataEntry->Size;
Result = (Begin <= RVA && RVA < End);
return Error::success();
1566}

1568Error ExportDirectoryEntryRef::getForwardTo(StringRef &Result) const {
uint32_t RVA;
if (auto EC = getExportRVA(RVA))
  return EC;
uintptr_t IntPtr = 0;
if (auto EC = OwningObject->getRvaPtr(RVA, IntPtr))
  return EC;
Result = StringRef(reinterpret_cast<const char *>(IntPtr));
return Error::success();
1577}

1579bool ImportedSymbolRef::
1580operator==(const ImportedSymbolRef &Other) const {
return Entry32 == Other.Entry32 && Entry64 == Other.Entry64
    && Index == Other.Index;
1583}

1585void ImportedSymbolRef::moveNext() {
++Index;
1587}

1589Error ImportedSymbolRef::getSymbolName(StringRef &Result) const {
uint32_t RVA;
if (Entry32) {
  // If a symbol is imported only by ordinal, it has no name.
  if (Entry32[Index].isOrdinal())
    return Error::success();
  RVA = Entry32[Index].getHintNameRVA();
} else {
  if (Entry64[Index].isOrdinal())
    return Error::success();
  RVA = Entry64[Index].getHintNameRVA();
}
uintptr_t IntPtr = 0;
if (Error EC = OwningObject->getRvaPtr(RVA, IntPtr))
  return EC;
// +2 because the first two bytes is hint.
Result = StringRef(reinterpret_cast<const char *>(IntPtr + 2));
return Error::success();
1607}

1609Error ImportedSymbolRef::isOrdinal(bool &Result) const {
if (Entry32)
  Result = Entry32[Index].isOrdinal();
else
  Result = Entry64[Index].isOrdinal();
return Error::success();
1615}

1617Error ImportedSymbolRef::getHintNameRVA(uint32_t &Result) const {
if (Entry32)
  Result = Entry32[Index].getHintNameRVA();
else
  Result = Entry64[Index].getHintNameRVA();
return Error::success();
1623}

1625Error ImportedSymbolRef::getOrdinal(uint16_t &Result) const {
uint32_t RVA;
if (Entry32) {
  if (Entry32[Index].isOrdinal()) {
    Result = Entry32[Index].getOrdinal();
    return Error::success();
  }
  RVA = Entry32[Index].getHintNameRVA();
} else {
  if (Entry64[Index].isOrdinal()) {
    Result = Entry64[Index].getOrdinal();
    return Error::success();
  }
  RVA = Entry64[Index].getHintNameRVA();
}
uintptr_t IntPtr = 0;
if (Error EC = OwningObject->getRvaPtr(RVA, IntPtr))
  return EC;
Result = *reinterpret_cast<const ulittle16_t *>(IntPtr);
return Error::success();
1645}

1647Expected<std::unique_ptr<COFFObjectFile>>
1648ObjectFile::createCOFFObjectFile(MemoryBufferRef Object) {
return COFFObjectFile::create(Object);
1650}

1652bool BaseRelocRef::operator==(const BaseRelocRef &Other) const {
return Header == Other.Header && Index == Other.Index;
1654}

1656void BaseRelocRef::moveNext() {
// Header->BlockSize is the size of the current block, including the
// size of the header itself.
uint32_t Size = sizeof(*Header) +
    sizeof(coff_base_reloc_block_entry) * (Index + 1);
if (Size == Header->BlockSize) {
  // .reloc contains a list of base relocation blocks. Each block
  // consists of the header followed by entries. The header contains
  // how many entories will follow. When we reach the end of the
  // current block, proceed to the next block.
  Header = reinterpret_cast<const coff_base_reloc_block_header *>(
      reinterpret_cast<const uint8_t *>(Header) + Size);
  Index = 0;
} else {
  ++Index;
}
1672}

1674Error BaseRelocRef::getType(uint8_t &Type) const {
auto *Entry = reinterpret_cast<const coff_base_reloc_block_entry *>(Header + 1);
Type = Entry[Index].getType();
return Error::success();
1678}

1680Error BaseRelocRef::getRVA(uint32_t &Result) const {
auto *Entry = reinterpret_cast<const coff_base_reloc_block_entry *>(Header + 1);
Result = Header->PageRVA + Entry[Index].getOffset();
return Error::success();
1684}

1686#define RETURN_IF_ERROR(Expr)do { Error E = (Expr); if (E) return std::move(E); } while (0
)                                                  \
do {                                                                         \
  Error E = (Expr);                                                          \
  if (E)                                                                     \
    return std::move(E);                                                     \
} while (0)

1693Expected<ArrayRef<UTF16>>
1694ResourceSectionRef::getDirStringAtOffset(uint32_t Offset) {
BinaryStreamReader Reader = BinaryStreamReader(BBS);
Reader.setOffset(Offset);
uint16_t Length;
2
←
'Length' declared without an initial value→
RETURN_IF_ERROR(Reader.readInteger(Length))do { Error E = (Reader.readInteger(Length)); if (E) return std
::move(E); } while (0);
3
←
Calling 'BinaryStreamReader::readInteger'→
7
←
Returning from 'BinaryStreamReader::readInteger'→
8
←
Assuming the condition is false→
9
←
Taking false branch→
10
←
Loop condition is false.  Exiting loop→
ArrayRef<UTF16> RawDirString;
RETURN_IF_ERROR(Reader.readArray(RawDirString, Length))do { Error E = (Reader.readArray(RawDirString, Length)); if (
E) return std::move(E); } while (0);
11
←
2nd function call argument is an uninitialized value
return RawDirString;
1702}

1704Expected<ArrayRef<UTF16>>
1705ResourceSectionRef::getEntryNameString(const coff_resource_dir_entry &Entry) {
return getDirStringAtOffset(Entry.Identifier.getNameOffset());
1
Calling 'ResourceSectionRef::getDirStringAtOffset'→
1707}

1709Expected<const coff_resource_dir_table &>
1710ResourceSectionRef::getTableAtOffset(uint32_t Offset) {
const coff_resource_dir_table *Table = nullptr;

BinaryStreamReader Reader(BBS);
Reader.setOffset(Offset);
RETURN_IF_ERROR(Reader.readObject(Table))do { Error E = (Reader.readObject(Table)); if (E) return std::
move(E); } while (0);
assert(Table != nullptr)(static_cast <bool> (Table != nullptr) ? void (0) : __assert_fail
 ("Table != nullptr", "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1716, __extension__ __PRETTY_FUNCTION__));
return *Table;
1718}

1720Expected<const coff_resource_dir_entry &>
1721ResourceSectionRef::getTableEntryAtOffset(uint32_t Offset) {
const coff_resource_dir_entry *Entry = nullptr;

BinaryStreamReader Reader(BBS);
Reader.setOffset(Offset);
RETURN_IF_ERROR(Reader.readObject(Entry))do { Error E = (Reader.readObject(Entry)); if (E) return std::
move(E); } while (0);
assert(Entry != nullptr)(static_cast <bool> (Entry != nullptr) ? void (0) : __assert_fail
 ("Entry != nullptr", "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1727, __extension__ __PRETTY_FUNCTION__));
return *Entry;
1729}

1731Expected<const coff_resource_data_entry &>
1732ResourceSectionRef::getDataEntryAtOffset(uint32_t Offset) {
const coff_resource_data_entry *Entry = nullptr;

BinaryStreamReader Reader(BBS);
Reader.setOffset(Offset);
RETURN_IF_ERROR(Reader.readObject(Entry))do { Error E = (Reader.readObject(Entry)); if (E) return std::
move(E); } while (0);
assert(Entry != nullptr)(static_cast <bool> (Entry != nullptr) ? void (0) : __assert_fail
 ("Entry != nullptr", "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1738, __extension__ __PRETTY_FUNCTION__));
return *Entry;
1740}

1742Expected<const coff_resource_dir_table &>
1743ResourceSectionRef::getEntrySubDir(const coff_resource_dir_entry &Entry) {
assert(Entry.Offset.isSubDir())(static_cast <bool> (Entry.Offset.isSubDir()) ? void (0
) : __assert_fail ("Entry.Offset.isSubDir()", "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1744, __extension__ __PRETTY_FUNCTION__));
return getTableAtOffset(Entry.Offset.value());
1746}

1748Expected<const coff_resource_data_entry &>
1749ResourceSectionRef::getEntryData(const coff_resource_dir_entry &Entry) {
assert(!Entry.Offset.isSubDir())(static_cast <bool> (!Entry.Offset.isSubDir()) ? void (
0) : __assert_fail ("!Entry.Offset.isSubDir()", "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/lib/Object/COFFObjectFile.cpp"
, 1750, __extension__ __PRETTY_FUNCTION__));
return getDataEntryAtOffset(Entry.Offset.value());
1752}

1754Expected<const coff_resource_dir_table &> ResourceSectionRef::getBaseTable() {
return getTableAtOffset(0);
1756}

1758Expected<const coff_resource_dir_entry &>
1759ResourceSectionRef::getTableEntry(const coff_resource_dir_table &Table,
                                uint32_t Index) {
if (Index >= (uint32_t)(Table.NumberOfNameEntries + Table.NumberOfIDEntries))
  return createStringError(object_error::parse_failed, "index out of range");
const uint8_t *TablePtr = reinterpret_cast<const uint8_t *>(&Table);
ptrdiff_t TableOffset = TablePtr - BBS.data().data();
return getTableEntryAtOffset(TableOffset + sizeof(Table) +
                             Index * sizeof(coff_resource_dir_entry));
1767}

1769Error ResourceSectionRef::load(const COFFObjectFile *O) {
for (const SectionRef &S : O->sections()) {
  Expected<StringRef> Name = S.getName();
  if (!Name)
    return Name.takeError();

  if (*Name == ".rsrc" || *Name == ".rsrc$01")
    return load(O, S);
}
return createStringError(object_error::parse_failed,
                         "no resource section found");
1780}

1782Error ResourceSectionRef::load(const COFFObjectFile *O, const SectionRef &S) {
Obj = O;
Section = S;
Expected<StringRef> Contents = Section.getContents();
if (!Contents)
  return Contents.takeError();
BBS = BinaryByteStream(*Contents, support::little);
const coff_section *COFFSect = Obj->getCOFFSection(Section);
ArrayRef<coff_relocation> OrigRelocs = Obj->getRelocations(COFFSect);
Relocs.reserve(OrigRelocs.size());
for (const coff_relocation &R : OrigRelocs)
  Relocs.push_back(&R);
llvm::sort(Relocs, [](const coff_relocation *A, const coff_relocation *B) {
  return A->VirtualAddress < B->VirtualAddress;
});
return Error::success();
1798}

1800Expected<StringRef>
1801ResourceSectionRef::getContents(const coff_resource_data_entry &Entry) {
if (!Obj)
  return createStringError(object_error::parse_failed, "no object provided");

// Find a potential relocation at the DataRVA field (first member of
// the coff_resource_data_entry struct).
const uint8_t *EntryPtr = reinterpret_cast<const uint8_t *>(&Entry);
ptrdiff_t EntryOffset = EntryPtr - BBS.data().data();
coff_relocation RelocTarget{ulittle32_t(EntryOffset), ulittle32_t(0),
                            ulittle16_t(0)};
auto RelocsForOffset =
    std::equal_range(Relocs.begin(), Relocs.end(), &RelocTarget,
                     [](const coff_relocation *A, const coff_relocation *B) {
                       return A->VirtualAddress < B->VirtualAddress;
                     });

if (RelocsForOffset.first != RelocsForOffset.second) {
  // We found a relocation with the right offset. Check that it does have
  // the expected type.
  const coff_relocation &R = **RelocsForOffset.first;
  uint16_t RVAReloc;
  switch (Obj->getMachine()) {
  case COFF::IMAGE_FILE_MACHINE_I386:
    RVAReloc = COFF::IMAGE_REL_I386_DIR32NB;
    break;
  case COFF::IMAGE_FILE_MACHINE_AMD64:
    RVAReloc = COFF::IMAGE_REL_AMD64_ADDR32NB;
    break;
  case COFF::IMAGE_FILE_MACHINE_ARMNT:
    RVAReloc = COFF::IMAGE_REL_ARM_ADDR32NB;
    break;
  case COFF::IMAGE_FILE_MACHINE_ARM64:
    RVAReloc = COFF::IMAGE_REL_ARM64_ADDR32NB;
    break;
  default:
    return createStringError(object_error::parse_failed,
                             "unsupported architecture");
  }
  if (R.Type != RVAReloc)
    return createStringError(object_error::parse_failed,
                             "unexpected relocation type");
  // Get the relocation's symbol
  Expected<COFFSymbolRef> Sym = Obj->getSymbol(R.SymbolTableIndex);
  if (!Sym)
    return Sym.takeError();
  // And the symbol's section
  Expected<const coff_section *> Section =
      Obj->getSection(Sym->getSectionNumber());
  if (!Section)
    return Section.takeError();
  // Add the initial value of DataRVA to the symbol's offset to find the
  // data it points at.
  uint64_t Offset = Entry.DataRVA + Sym->getValue();
  ArrayRef<uint8_t> Contents;
  if (Error E = Obj->getSectionContents(*Section, Contents))
    return std::move(E);
  if (Offset + Entry.DataSize > Contents.size())
    return createStringError(object_error::parse_failed,
                             "data outside of section");
  // Return a reference to the data inside the section.
  return StringRef(reinterpret_cast<const char *>(Contents.data()) + Offset,
                   Entry.DataSize);
} else {
  // Relocatable objects need a relocation for the DataRVA field.
  if (Obj->isRelocatableObject())
    return createStringError(object_error::parse_failed,
                             "no relocation found for DataRVA");

  // Locate the section that contains the address that DataRVA points at.
  uint64_t VA = Entry.DataRVA + Obj->getImageBase();
  for (const SectionRef &S : Obj->sections()) {
    if (VA >= S.getAddress() &&
        VA + Entry.DataSize <= S.getAddress() + S.getSize()) {
      uint64_t Offset = VA - S.getAddress();
      Expected<StringRef> Contents = S.getContents();
      if (!Contents)
        return Contents.takeError();
      return Contents->slice(Offset, Offset + Entry.DataSize);
    }
  }
  return createStringError(object_error::parse_failed,
                           "address not found in image");
}
1884}

←

/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/include/llvm/Support/BinaryStreamReader.h

1//===- BinaryStreamReader.h - Reads objects from a binary stream *- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//

9#ifndef LLVM_SUPPORT_BINARYSTREAMREADER_H
10#define LLVM_SUPPORT_BINARYSTREAMREADER_H

12#include "llvm/ADT/ArrayRef.h"
13#include "llvm/ADT/STLExtras.h"
14#include "llvm/ADT/StringRef.h"
15#include "llvm/Support/Alignment.h"
16#include "llvm/Support/BinaryStreamArray.h"
17#include "llvm/Support/BinaryStreamRef.h"
18#include "llvm/Support/ConvertUTF.h"
19#include "llvm/Support/Endian.h"
20#include "llvm/Support/Error.h"
21#include "llvm/Support/type_traits.h"
22#include <type_traits>

24namespace llvm {

26/// Provides read only access to a subclass of `BinaryStream`.  Provides
27/// bounds checking and helpers for writing certain common data types such as
28/// null-terminated strings, integers in various flavors of endianness, etc.
29/// Can be subclassed to provide reading of custom datatypes, although no
30/// are overridable.
31class BinaryStreamReader {
32public:
BinaryStreamReader() = default;
explicit BinaryStreamReader(BinaryStreamRef Ref);
explicit BinaryStreamReader(BinaryStream &Stream);
explicit BinaryStreamReader(ArrayRef<uint8_t> Data,
                            llvm::support::endianness Endian);
explicit BinaryStreamReader(StringRef Data, llvm::support::endianness Endian);

BinaryStreamReader(const BinaryStreamReader &Other)
    : Stream(Other.Stream), Offset(Other.Offset) {}

BinaryStreamReader &operator=(const BinaryStreamReader &Other) {
  Stream = Other.Stream;
  Offset = Other.Offset;
  return *this;
}

virtual ~BinaryStreamReader() {}

/// Read as much as possible from the underlying string at the current offset
/// without invoking a copy, and set \p Buffer to the resulting data slice.
/// Updates the stream's offset to point after the newly read data.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readLongestContiguousChunk(ArrayRef<uint8_t> &Buffer);

/// Read \p Size bytes from the underlying stream at the current offset and
/// and set \p Buffer to the resulting data slice.  Whether a copy occurs
/// depends on the implementation of the underlying stream.  Updates the
/// stream's offset to point after the newly read data.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size);

/// Read an integer of the specified endianness into \p Dest and update the
/// stream's offset.  The data is always copied from the stream's underlying
/// buffer into \p Dest. Updates the stream's offset to point after the newly
/// read data.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
template <typename T> Error readInteger(T &Dest) {
  static_assert(std::is_integral<T>::value,
                "Cannot call readInteger with non-integral value!");

  ArrayRef<uint8_t> Bytes;
  if (auto EC = readBytes(Bytes, sizeof(T)))
4
←
Assuming the condition is true→
5
←
Taking true branch→
    return EC;
6
←
Returning without writing to 'Dest'→

  Dest = llvm::support::endian::read<T, llvm::support::unaligned>(
      Bytes.data(), Stream.getEndian());
  return Error::success();
}

/// Similar to readInteger.
template <typename T> Error readEnum(T &Dest) {
  static_assert(std::is_enum<T>::value,
                "Cannot call readEnum with non-enum value!");
  std::underlying_type_t<T> N;
  if (auto EC = readInteger(N))
    return EC;
  Dest = static_cast<T>(N);
  return Error::success();
}

/// Read an unsigned LEB128 encoded value.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readULEB128(uint64_t &Dest);

/// Read a signed LEB128 encoded value.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readSLEB128(int64_t &Dest);

/// Read a null terminated string from \p Dest.  Whether a copy occurs depends
/// on the implementation of the underlying stream.  Updates the stream's
/// offset to point after the newly read data.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readCString(StringRef &Dest);

/// Similar to readCString, however read a null-terminated UTF16 string
/// instead.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readWideString(ArrayRef<UTF16> &Dest);

/// Read a \p Length byte string into \p Dest.  Whether a copy occurs depends
/// on the implementation of the underlying stream.  Updates the stream's
/// offset to point after the newly read data.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readFixedString(StringRef &Dest, uint32_t Length);

/// Read the entire remainder of the underlying stream into \p Ref.  This is
/// equivalent to calling getUnderlyingStream().slice(Offset).  Updates the
/// stream's offset to point to the end of the stream.  Never causes a copy.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readStreamRef(BinaryStreamRef &Ref);

/// Read \p Length bytes from the underlying stream into \p Ref.  This is
/// equivalent to calling getUnderlyingStream().slice(Offset, Length).
/// Updates the stream's offset to point after the newly read object.  Never
/// causes a copy.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readStreamRef(BinaryStreamRef &Ref, uint32_t Length);

/// Read \p Length bytes from the underlying stream into \p Ref.  This is
/// equivalent to calling getUnderlyingStream().slice(Offset, Length).
/// Updates the stream's offset to point after the newly read object.  Never
/// causes a copy.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
Error readSubstream(BinarySubstreamRef &Ref, uint32_t Length);

/// Get a pointer to an object of type T from the underlying stream, as if by
/// memcpy, and store the result into \p Dest.  It is up to the caller to
/// ensure that objects of type T can be safely treated in this manner.
/// Updates the stream's offset to point after the newly read object.  Whether
/// a copy occurs depends upon the implementation of the underlying
/// stream.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
template <typename T> Error readObject(const T *&Dest) {
  ArrayRef<uint8_t> Buffer;
  if (auto EC = readBytes(Buffer, sizeof(T)))
    return EC;
  Dest = reinterpret_cast<const T *>(Buffer.data());
  return Error::success();
}

/// Get a reference to a \p NumElements element array of objects of type T
/// from the underlying stream as if by memcpy, and store the resulting array
/// slice into \p array.  It is up to the caller to ensure that objects of
/// type T can be safely treated in this manner.  Updates the stream's offset
/// to point after the newly read object.  Whether a copy occurs depends upon
/// the implementation of the underlying stream.
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
template <typename T>
Error readArray(ArrayRef<T> &Array, uint32_t NumElements) {
  ArrayRef<uint8_t> Bytes;
  if (NumElements == 0) {
    Array = ArrayRef<T>();
    return Error::success();
  }

  if (NumElements > UINT32_MAX(4294967295U) / sizeof(T))
    return make_error<BinaryStreamError>(
        stream_error_code::invalid_array_size);

  if (auto EC = readBytes(Bytes, NumElements * sizeof(T)))
    return EC;

  assert(isAddrAligned(Align::Of<T>(), Bytes.data()) &&(static_cast <bool> (isAddrAligned(Align::Of<T>()
, Bytes.data()) && "Reading at invalid alignment!") ?
 void (0) : __assert_fail ("isAddrAligned(Align::Of<T>(), Bytes.data()) && \"Reading at invalid alignment!\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/include/llvm/Support/BinaryStreamReader.h"
, 202, __extension__ __PRETTY_FUNCTION__))
         "Reading at invalid alignment!")(static_cast <bool> (isAddrAligned(Align::Of<T>()
, Bytes.data()) && "Reading at invalid alignment!") ?
 void (0) : __assert_fail ("isAddrAligned(Align::Of<T>(), Bytes.data()) && \"Reading at invalid alignment!\""
, "/build/llvm-toolchain-snapshot-13~++20210525111110+78eaff2ef8a9/llvm/include/llvm/Support/BinaryStreamReader.h"
, 202, __extension__ __PRETTY_FUNCTION__));

  Array = ArrayRef<T>(reinterpret_cast<const T *>(Bytes.data()), NumElements);
  return Error::success();
}

/// Read a VarStreamArray of size \p Size bytes and store the result into
/// \p Array.  Updates the stream's offset to point after the newly read
/// array.  Never causes a copy (although iterating the elements of the
/// VarStreamArray may, depending upon the implementation of the underlying
/// stream).
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
template <typename T, typename U>
Error readArray(VarStreamArray<T, U> &Array, uint32_t Size,
                uint32_t Skew = 0) {
  BinaryStreamRef S;
  if (auto EC = readStreamRef(S, Size))
    return EC;
  Array.setUnderlyingStream(S, Skew);
  return Error::success();
}

/// Read a FixedStreamArray of \p NumItems elements and store the result into
/// \p Array.  Updates the stream's offset to point after the newly read
/// array.  Never causes a copy (although iterating the elements of the
/// FixedStreamArray may, depending upon the implementation of the underlying
/// stream).
///
/// \returns a success error code if the data was successfully read, otherwise
/// returns an appropriate error code.
template <typename T>
Error readArray(FixedStreamArray<T> &Array, uint32_t NumItems) {
  if (NumItems == 0) {
    Array = FixedStreamArray<T>();
    return Error::success();
  }

  if (NumItems > UINT32_MAX(4294967295U) / sizeof(T))
    return make_error<BinaryStreamError>(
        stream_error_code::invalid_array_size);

  BinaryStreamRef View;
  if (auto EC = readStreamRef(View, NumItems * sizeof(T)))
    return EC;

  Array = FixedStreamArray<T>(View);
  return Error::success();
}

bool empty() const { return bytesRemaining() == 0; }
void setOffset(uint32_t Off) { Offset = Off; }
uint32_t getOffset() const { return Offset; }
uint32_t getLength() const { return Stream.getLength(); }
uint32_t bytesRemaining() const { return getLength() - getOffset(); }

/// Advance the stream's offset by \p Amount bytes.
///
/// \returns a success error code if at least \p Amount bytes remain in the
/// stream, otherwise returns an appropriate error code.
Error skip(uint32_t Amount);

/// Examine the next byte of the underlying stream without advancing the
/// stream's offset.  If the stream is empty the behavior is undefined.
///
/// \returns the next byte in the stream.
uint8_t peek() const;

Error padToAlignment(uint32_t Align);

std::pair<BinaryStreamReader, BinaryStreamReader>
split(uint32_t Offset) const;

276private:
BinaryStreamRef Stream;
uint32_t Offset = 0;
279};
280} // namespace llvm

282#endif // LLVM_SUPPORT_BINARYSTREAMREADER_H