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llvm-6502/lib/Object/COFFObjectFile.cpp
David Majnemer 5b1b9844e7 Object, COFF: Cap the section contents to min(VirtualSize, SizeOfRawData) 
It is not useful to return the data beyond VirtualSize it's less than
SizeOfRawData.

An implementation detail of COFF requires the section size to be rounded
up to a multiple of FileAlignment; this means that SizeOfRawData is not
representative of how large the section is.  Instead, we should cap it
to VirtualSize when this occurs as it represents the true size of the
section.

Note that this is only relevant in executable files because this
rounding doesn't occur in object files (and VirtualSize is always zero).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219388 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-09 07:49:28 +00:00

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//===- COFFObjectFile.cpp - COFF object file implementation -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the COFFObjectFile class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/COFF.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/COFF.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
#include <limits>
using namespace llvm;
using namespace object;
using support::ulittle16_t;
using support::ulittle32_t;
using support::ulittle64_t;
using support::little16_t;
// Returns false if size is greater than the buffer size. And sets ec.
static bool checkSize(MemoryBufferRef M, std::error_code &EC, uint64_t Size) {
if (M.getBufferSize() < Size) {
EC = object_error::unexpected_eof;
return false;
}
return true;
}
// Sets Obj unless any bytes in [addr, addr + size) fall outsize of m.
// Returns unexpected_eof if error.
template <typename T>
static std::error_code getObject(const T *&Obj, MemoryBufferRef M,
const uint8_t *Ptr,
const size_t Size = sizeof(T)) {
uintptr_t Addr = uintptr_t(Ptr);
if (Addr + Size < Addr || Addr + Size < Size ||
Addr + Size > uintptr_t(M.getBufferEnd())) {
return object_error::unexpected_eof;
}
Obj = reinterpret_cast<const T *>(Addr);
return object_error::success;
}
// Decode a string table entry in base 64 (//AAAAAA). Expects \arg Str without
// prefixed slashes.
static bool decodeBase64StringEntry(StringRef Str, uint32_t &Result) {
assert(Str.size() <= 6 && "String too long, possible overflow.");
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;
}
template <typename coff_symbol_type>
const coff_symbol_type *COFFObjectFile::toSymb(DataRefImpl Ref) const {
const coff_symbol_type *Addr =
reinterpret_cast<const coff_symbol_type *>(Ref.p);
#ifndef NDEBUG
// Verify that the symbol points to a valid entry in the symbol table.
uintptr_t Offset = uintptr_t(Addr) - uintptr_t(base());
if (Offset < getPointerToSymbolTable() ||
Offset >= getPointerToSymbolTable() +
(getNumberOfSymbols() * sizeof(coff_symbol_type)))
report_fatal_error("Symbol was outside of symbol table.");
assert((Offset - getPointerToSymbolTable()) % sizeof(coff_symbol_type) == 0 &&
"Symbol did not point to the beginning of a symbol");
#endif
return Addr;
}
const coff_section *COFFObjectFile::toSec(DataRefImpl Ref) const {
const coff_section *Addr = reinterpret_cast<const coff_section*>(Ref.p);
# 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 = uintptr_t(Addr) - uintptr_t(SectionTable);
assert(Offset % sizeof(coff_section) == 0 &&
"Section did not point to the beginning of a section");
# endif
return Addr;
}
void COFFObjectFile::moveSymbolNext(DataRefImpl &Ref) const {
if (SymbolTable16) {
const coff_symbol16 *Symb = toSymb<coff_symbol16>(Ref);
Symb += 1 + Symb->NumberOfAuxSymbols;
Ref.p = reinterpret_cast<uintptr_t>(Symb);
} else if (SymbolTable32) {
const coff_symbol32 *Symb = toSymb<coff_symbol32>(Ref);
Symb += 1 + Symb->NumberOfAuxSymbols;
Ref.p = reinterpret_cast<uintptr_t>(Symb);
} else {
llvm_unreachable("no symbol table pointer!");
}
}
std::error_code COFFObjectFile::getSymbolName(DataRefImpl Ref,
StringRef &Result) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
return getSymbolName(Symb, Result);
}
std::error_code COFFObjectFile::getSymbolAddress(DataRefImpl Ref,
uint64_t &Result) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
const coff_section *Section = nullptr;
if (std::error_code EC = getSection(Symb.getSectionNumber(), Section))
return EC;
if (Symb.getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED)
Result = UnknownAddressOrSize;
else if (Section)
Result = Section->VirtualAddress + Symb.getValue();
else
Result = Symb.getValue();
return object_error::success;
}
std::error_code COFFObjectFile::getSymbolType(DataRefImpl Ref,
SymbolRef::Type &Result) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
Result = SymbolRef::ST_Other;
if (Symb.getStorageClass() == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
Symb.getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED) {
Result = SymbolRef::ST_Unknown;
} else if (Symb.isFunctionDefinition()) {
Result = SymbolRef::ST_Function;
} else {
uint32_t Characteristics = 0;
if (!COFF::isReservedSectionNumber(Symb.getSectionNumber())) {
const coff_section *Section = nullptr;
if (std::error_code EC = getSection(Symb.getSectionNumber(), Section))
return EC;
Characteristics = Section->Characteristics;
}
if (Characteristics & COFF::IMAGE_SCN_MEM_READ &&
~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
Result = SymbolRef::ST_Data;
}
return object_error::success;
}
uint32_t COFFObjectFile::getSymbolFlags(DataRefImpl Ref) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
uint32_t Result = SymbolRef::SF_None;
// TODO: Correctly set SF_FormatSpecific, SF_Common
if (Symb.getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED) {
if (Symb.getValue() == 0)
Result |= SymbolRef::SF_Undefined;
else
Result |= SymbolRef::SF_Common;
}
// TODO: This are certainly too restrictive.
if (Symb.getStorageClass() == COFF::IMAGE_SYM_CLASS_EXTERNAL)
Result |= SymbolRef::SF_Global;
if (Symb.getStorageClass() == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
Result |= SymbolRef::SF_Weak;
if (Symb.getSectionNumber() == COFF::IMAGE_SYM_ABSOLUTE)
Result |= SymbolRef::SF_Absolute;
return Result;
}
std::error_code COFFObjectFile::getSymbolSize(DataRefImpl Ref,
uint64_t &Result) const {
// FIXME: Return the correct size. This requires looking at all the symbols
// in the same section as this symbol, and looking for either the next
// symbol, or the end of the section.
COFFSymbolRef Symb = getCOFFSymbol(Ref);
const coff_section *Section = nullptr;
if (std::error_code EC = getSection(Symb.getSectionNumber(), Section))
return EC;
if (Symb.getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED) {
if (Symb.getValue() == 0)
Result = UnknownAddressOrSize;
else
Result = Symb.getValue();
} else if (Section) {
Result = Section->SizeOfRawData - Symb.getValue();
} else {
Result = 0;
}
return object_error::success;
}
std::error_code
COFFObjectFile::getSymbolSection(DataRefImpl Ref,
section_iterator &Result) const {
COFFSymbolRef Symb = getCOFFSymbol(Ref);
if (COFF::isReservedSectionNumber(Symb.getSectionNumber())) {
Result = section_end();
} else {
const coff_section *Sec = nullptr;
if (std::error_code EC = getSection(Symb.getSectionNumber(), Sec))
return EC;
DataRefImpl Ref;
Ref.p = reinterpret_cast<uintptr_t>(Sec);
Result = section_iterator(SectionRef(Ref, this));
}
return object_error::success;
}
void COFFObjectFile::moveSectionNext(DataRefImpl &Ref) const {
const coff_section *Sec = toSec(Ref);
Sec += 1;
Ref.p = reinterpret_cast<uintptr_t>(Sec);
}
std::error_code COFFObjectFile::getSectionName(DataRefImpl Ref,
StringRef &Result) const {
const coff_section *Sec = toSec(Ref);
return getSectionName(Sec, Result);
}
uint64_t COFFObjectFile::getSectionAddress(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->VirtualAddress;
}
uint64_t COFFObjectFile::getSectionSize(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->SizeOfRawData;
}
std::error_code COFFObjectFile::getSectionContents(DataRefImpl Ref,
StringRef &Result) const {
const coff_section *Sec = toSec(Ref);
ArrayRef<uint8_t> Res;
std::error_code EC = getSectionContents(Sec, Res);
Result = StringRef(reinterpret_cast<const char*>(Res.data()), Res.size());
return EC;
}
uint64_t COFFObjectFile::getSectionAlignment(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return uint64_t(1) << (((Sec->Characteristics & 0x00F00000) >> 20) - 1);
}
bool COFFObjectFile::isSectionText(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->Characteristics & COFF::IMAGE_SCN_CNT_CODE;
}
bool COFFObjectFile::isSectionData(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA;
}
bool COFFObjectFile::isSectionBSS(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
}
bool COFFObjectFile::isSectionRequiredForExecution(DataRefImpl Ref) const {
// FIXME: Unimplemented
return true;
}
bool COFFObjectFile::isSectionVirtual(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
return Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA;
}
bool COFFObjectFile::isSectionZeroInit(DataRefImpl Ref) const {
// FIXME: Unimplemented.
return false;
}
bool COFFObjectFile::isSectionReadOnlyData(DataRefImpl Ref) const {
// FIXME: Unimplemented.
return false;
}
bool COFFObjectFile::sectionContainsSymbol(DataRefImpl SecRef,
DataRefImpl SymbRef) const {
const coff_section *Sec = toSec(SecRef);
COFFSymbolRef Symb = getCOFFSymbol(SymbRef);
int32_t SecNumber = (Sec - SectionTable) + 1;
return SecNumber == Symb.getSectionNumber();
}
relocation_iterator COFFObjectFile::section_rel_begin(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
DataRefImpl Ret;
if (Sec->NumberOfRelocations == 0) {
Ret.p = 0;
} else {
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++;
}
Ret.p = reinterpret_cast<uintptr_t>(begin);
}
return relocation_iterator(RelocationRef(Ret, this));
}
static uint32_t getNumberOfRelocations(const coff_section *Sec,
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()) {
auto *FirstReloc = reinterpret_cast<const coff_relocation*>(
base + Sec->PointerToRelocations);
return FirstReloc->VirtualAddress;
}
return Sec->NumberOfRelocations;
}
relocation_iterator COFFObjectFile::section_rel_end(DataRefImpl Ref) const {
const coff_section *Sec = toSec(Ref);
DataRefImpl Ret;
if (Sec->NumberOfRelocations == 0) {
Ret.p = 0;
} else {
auto begin = reinterpret_cast<const coff_relocation*>(
base() + Sec->PointerToRelocations);
uint32_t NumReloc = getNumberOfRelocations(Sec, base());
Ret.p = reinterpret_cast<uintptr_t>(begin + NumReloc);
}
return relocation_iterator(RelocationRef(Ret, this));
}
// Initialize the pointer to the symbol table.
std::error_code COFFObjectFile::initSymbolTablePtr() {
if (COFFHeader)
if (std::error_code EC =
getObject(SymbolTable16, Data, base() + getPointerToSymbolTable(),
getNumberOfSymbols() * getSymbolTableEntrySize()))
return EC;
if (COFFBigObjHeader)
if (std::error_code EC =
getObject(SymbolTable32, Data, base() + getPointerToSymbolTable(),
getNumberOfSymbols() * getSymbolTableEntrySize()))
return EC;
// 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.
const uint8_t *StringTableAddr =
base() + getPointerToSymbolTable() +
getNumberOfSymbols() * getSymbolTableEntrySize();
const ulittle32_t *StringTableSizePtr;
if (std::error_code EC = getObject(StringTableSizePtr, Data, StringTableAddr))
return EC;
StringTableSize = *StringTableSizePtr;
if (std::error_code EC =
getObject(StringTable, Data, StringTableAddr, StringTableSize))
return EC;
// 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 object_error::parse_failed;
return object_error::success;
}
// Returns the file offset for the given VA.
std::error_code COFFObjectFile::getVaPtr(uint64_t Addr, uintptr_t &Res) const {
uint64_t ImageBase = PE32Header ? (uint64_t)PE32Header->ImageBase
: (uint64_t)PE32PlusHeader->ImageBase;
uint64_t Rva = Addr - ImageBase;
assert(Rva <= UINT32_MAX);
return getRvaPtr((uint32_t)Rva, Res);
}
// Returns the file offset for the given RVA.
std::error_code 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 = uintptr_t(base()) + Section->PointerToRawData + Offset;
return object_error::success;
}
}
return object_error::parse_failed;
}
// Returns hint and name fields, assuming \p Rva is pointing to a Hint/Name
// table entry.
std::error_code COFFObjectFile::getHintName(uint32_t Rva, uint16_t &Hint,
StringRef &Name) const {
uintptr_t IntPtr = 0;
if (std::error_code EC = getRvaPtr(Rva, IntPtr))
return EC;
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 object_error::success;
}
// Find the import table.
std::error_code 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;
if (getDataDirectory(COFF::IMPORT_TABLE, DataEntry))
return object_error::success;
// Do nothing if the pointer to import table is NULL.
if (DataEntry->RelativeVirtualAddress == 0)
return object_error::success;
uint32_t ImportTableRva = DataEntry->RelativeVirtualAddress;
// -1 because the last entry is the null entry.
NumberOfImportDirectory = DataEntry->Size /
sizeof(import_directory_table_entry) - 1;
// 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 (std::error_code EC = getRvaPtr(ImportTableRva, IntPtr))
return EC;
ImportDirectory = reinterpret_cast<
const import_directory_table_entry *>(IntPtr);
return object_error::success;
}
// Initializes DelayImportDirectory and NumberOfDelayImportDirectory.
std::error_code COFFObjectFile::initDelayImportTablePtr() {
const data_directory *DataEntry;
if (getDataDirectory(COFF::DELAY_IMPORT_DESCRIPTOR, DataEntry))
return object_error::success;
if (DataEntry->RelativeVirtualAddress == 0)
return object_error::success;
uint32_t RVA = DataEntry->RelativeVirtualAddress;
NumberOfDelayImportDirectory = DataEntry->Size /
sizeof(delay_import_directory_table_entry) - 1;
uintptr_t IntPtr = 0;
if (std::error_code EC = getRvaPtr(RVA, IntPtr))
return EC;
DelayImportDirectory = reinterpret_cast<
const delay_import_directory_table_entry *>(IntPtr);
return object_error::success;
}
// Find the export table.
std::error_code 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;
if (getDataDirectory(COFF::EXPORT_TABLE, DataEntry))
return object_error::success;
// Do nothing if the pointer to export table is NULL.
if (DataEntry->RelativeVirtualAddress == 0)
return object_error::success;
uint32_t ExportTableRva = DataEntry->RelativeVirtualAddress;
uintptr_t IntPtr = 0;
if (std::error_code EC = getRvaPtr(ExportTableRva, IntPtr))
return EC;
ExportDirectory =
reinterpret_cast<const export_directory_table_entry *>(IntPtr);
return object_error::success;
}
COFFObjectFile::COFFObjectFile(MemoryBufferRef Object, std::error_code &EC)
: 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), NumberOfImportDirectory(0),
DelayImportDirectory(nullptr), NumberOfDelayImportDirectory(0),
ExportDirectory(nullptr) {
// Check that we at least have enough room for a header.
if (!checkSize(Data, EC, sizeof(coff_file_header)))
return;
// 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 (base()[0] == 0x4d && base()[1] == 0x5a) {
// PE/COFF, seek through MS-DOS compatibility stub and 4-byte
// PE signature to find 'normal' COFF header.
if (!checkSize(Data, EC, 0x3c + 8))
return;
CurPtr = *reinterpret_cast<const ulittle16_t *>(base() + 0x3c);
// Check the PE magic bytes. ("PE\0\0")
if (std::memcmp(base() + CurPtr, COFF::PEMagic, sizeof(COFF::PEMagic)) !=
0) {
EC = object_error::parse_failed;
return;
}
CurPtr += sizeof(COFF::PEMagic); // Skip the PE magic bytes.
HasPEHeader = true;
}
if ((EC = getObject(COFFHeader, Data, base() + CurPtr)))
return;
// 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 ((EC = getObject(COFFBigObjHeader, Data, base() + CurPtr)))
return;
// 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 = object_error::success;
CurPtr += sizeof(coff_file_header);
if (COFFHeader->isImportLibrary())
return;
}
if (HasPEHeader) {
const pe32_header *Header;
if ((EC = getObject(Header, Data, base() + CurPtr)))
return;
const uint8_t *DataDirAddr;
uint64_t DataDirSize;
if (Header->Magic == 0x10b) {
PE32Header = Header;
DataDirAddr = base() + CurPtr + sizeof(pe32_header);
DataDirSize = sizeof(data_directory) * PE32Header->NumberOfRvaAndSize;
} else if (Header->Magic == 0x20b) {
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+.
EC = object_error::parse_failed;
return;
}
if ((EC = getObject(DataDirectory, Data, DataDirAddr, DataDirSize)))
return;
CurPtr += COFFHeader->SizeOfOptionalHeader;
}
if ((EC = getObject(SectionTable, Data, base() + CurPtr,
getNumberOfSections() * sizeof(coff_section))))
return;
// Initialize the pointer to the symbol table.
if (getPointerToSymbolTable() != 0)
if ((EC = initSymbolTablePtr()))
return;
// Initialize the pointer to the beginning of the import table.
if ((EC = initImportTablePtr()))
return;
if ((EC = initDelayImportTablePtr()))
return;
// Initialize the pointer to the export table.
if ((EC = initExportTablePtr()))
return;
EC = object_error::success;
}
basic_symbol_iterator COFFObjectFile::symbol_begin_impl() const {
DataRefImpl Ret;
Ret.p = getSymbolTable();
return basic_symbol_iterator(SymbolRef(Ret, this));
}
basic_symbol_iterator COFFObjectFile::symbol_end_impl() 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));
}
import_directory_iterator COFFObjectFile::import_directory_begin() const {
return import_directory_iterator(
ImportDirectoryEntryRef(ImportDirectory, 0, this));
}
import_directory_iterator COFFObjectFile::import_directory_end() const {
return import_directory_iterator(
ImportDirectoryEntryRef(ImportDirectory, NumberOfImportDirectory, this));
}
delay_import_directory_iterator
COFFObjectFile::delay_import_directory_begin() const {
return delay_import_directory_iterator(
DelayImportDirectoryEntryRef(DelayImportDirectory, 0, this));
}
delay_import_directory_iterator
COFFObjectFile::delay_import_directory_end() const {
return delay_import_directory_iterator(
DelayImportDirectoryEntryRef(
DelayImportDirectory, NumberOfDelayImportDirectory, this));
}
export_directory_iterator COFFObjectFile::export_directory_begin() const {
return export_directory_iterator(
ExportDirectoryEntryRef(ExportDirectory, 0, this));
}
export_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);
}
section_iterator COFFObjectFile::section_begin() const {
DataRefImpl Ret;
Ret.p = reinterpret_cast<uintptr_t>(SectionTable);
return section_iterator(SectionRef(Ret, this));
}
section_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));
}
uint8_t COFFObjectFile::getBytesInAddress() const {
return getArch() == Triple::x86_64 ? 8 : 4;
}
StringRef 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";
default:
return "COFF-<unknown arch>";
}
}
unsigned 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;
default:
return Triple::UnknownArch;
}
}
iterator_range<import_directory_iterator>
COFFObjectFile::import_directories() const {
return make_range(import_directory_begin(), import_directory_end());
}
iterator_range<delay_import_directory_iterator>
COFFObjectFile::delay_import_directories() const {
return make_range(delay_import_directory_begin(),
delay_import_directory_end());
}
iterator_range<export_directory_iterator>
COFFObjectFile::export_directories() const {
return make_range(export_directory_begin(), export_directory_end());
}
std::error_code COFFObjectFile::getPE32Header(const pe32_header *&Res) const {
Res = PE32Header;
return object_error::success;
}
std::error_code
COFFObjectFile::getPE32PlusHeader(const pe32plus_header *&Res) const {
Res = PE32PlusHeader;
return object_error::success;
}
std::error_code
COFFObjectFile::getDataDirectory(uint32_t Index,
const data_directory *&Res) const {
// Error if if there's no data directory or the index is out of range.
if (!DataDirectory)
return object_error::parse_failed;
assert(PE32Header || PE32PlusHeader);
uint32_t NumEnt = PE32Header ? PE32Header->NumberOfRvaAndSize
: PE32PlusHeader->NumberOfRvaAndSize;
if (Index > NumEnt)
return object_error::parse_failed;
Res = &DataDirectory[Index];
return object_error::success;
}
std::error_code COFFObjectFile::getSection(int32_t Index,
const coff_section *&Result) const {
// Check for special index values.
if (COFF::isReservedSectionNumber(Index))
Result = nullptr;
else if (Index > 0 && static_cast<uint32_t>(Index) <= getNumberOfSections())
// We already verified the section table data, so no need to check again.
Result = SectionTable + (Index - 1);
else
return object_error::parse_failed;
return object_error::success;
}
std::error_code COFFObjectFile::getString(uint32_t Offset,
StringRef &Result) const {
if (StringTableSize <= 4)
// Tried to get a string from an empty string table.
return object_error::parse_failed;
if (Offset >= StringTableSize)
return object_error::unexpected_eof;
Result = StringRef(StringTable + Offset);
return object_error::success;
}
std::error_code COFFObjectFile::getSymbolName(COFFSymbolRef Symbol,
StringRef &Res) const {
// Check for string table entry. First 4 bytes are 0.
if (Symbol.getStringTableOffset().Zeroes == 0) {
uint32_t Offset = Symbol.getStringTableOffset().Offset;
if (std::error_code EC = getString(Offset, Res))
return EC;
return object_error::success;
}
if (Symbol.getShortName()[COFF::NameSize - 1] == 0)
// Null terminated, let ::strlen figure out the length.
Res = StringRef(Symbol.getShortName());
else
// Not null terminated, use all 8 bytes.
Res = StringRef(Symbol.getShortName(), COFF::NameSize);
return object_error::success;
}
ArrayRef<uint8_t>
COFFObjectFile::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;
# 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 &&
"Aux Symbol data did not point to the beginning of a symbol");
# endif
}
return makeArrayRef(Aux, Symbol.getNumberOfAuxSymbols() * SymbolSize);
}
std::error_code COFFObjectFile::getSectionName(const coff_section *Sec,
StringRef &Res) 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[0] == '/') {
uint32_t Offset;
if (Name[1] == '/') {
if (decodeBase64StringEntry(Name.substr(2), Offset))
return object_error::parse_failed;
} else {
if (Name.substr(1).getAsInteger(10, Offset))
return object_error::parse_failed;
}
if (std::error_code EC = getString(Offset, Name))
return EC;
}
Res = Name;
return object_error::success;
}
std::error_code
COFFObjectFile::getSectionContents(const coff_section *Sec,
ArrayRef<uint8_t> &Res) const {
// PointerToRawData and SizeOfRawData won't make sense for BSS sections,
// don't do anything interesting for them.
assert((Sec->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0 &&
"BSS sections don't have contents!");
// 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 = uintptr_t(base()) + Sec->PointerToRawData;
// 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 is always zero.
//
// 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.
uint32_t DataSize;
if (Sec->VirtualSize)
DataSize = std::min(Sec->VirtualSize, Sec->SizeOfRawData);
else
DataSize = Sec->SizeOfRawData;
uintptr_t ConEnd = ConStart + DataSize;
if (ConEnd > uintptr_t(Data.getBufferEnd()))
return object_error::parse_failed;
Res = makeArrayRef(reinterpret_cast<const uint8_t *>(ConStart), DataSize);
return object_error::success;
}
const coff_relocation *COFFObjectFile::toRel(DataRefImpl Rel) const {
return reinterpret_cast<const coff_relocation*>(Rel.p);
}
void COFFObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
Rel.p = reinterpret_cast<uintptr_t>(
reinterpret_cast<const coff_relocation*>(Rel.p) + 1);
}
std::error_code COFFObjectFile::getRelocationAddress(DataRefImpl Rel,
uint64_t &Res) const {
report_fatal_error("getRelocationAddress not implemented in COFFObjectFile");
}
std::error_code COFFObjectFile::getRelocationOffset(DataRefImpl Rel,
uint64_t &Res) const {
Res = toRel(Rel)->VirtualAddress;
return object_error::success;
}
symbol_iterator COFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
const coff_relocation *R = toRel(Rel);
DataRefImpl Ref;
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!");
return symbol_iterator(SymbolRef(Ref, this));
}
std::error_code COFFObjectFile::getRelocationType(DataRefImpl Rel,
uint64_t &Res) const {
const coff_relocation* R = toRel(Rel);
Res = R->Type;
return object_error::success;
}
const coff_section *
COFFObjectFile::getCOFFSection(const SectionRef &Section) const {
return toSec(Section.getRawDataRefImpl());
}
COFFSymbolRef 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!");
}
COFFSymbolRef COFFObjectFile::getCOFFSymbol(const SymbolRef &Symbol) const {
return getCOFFSymbol(Symbol.getRawDataRefImpl());
}
const coff_relocation *
COFFObjectFile::getCOFFRelocation(const RelocationRef &Reloc) const {
return toRel(Reloc.getRawDataRefImpl());
}
#define LLVM_COFF_SWITCH_RELOC_TYPE_NAME(reloc_type) \
case COFF::reloc_type: \
Res = #reloc_type; \
break;
std::error_code
COFFObjectFile::getRelocationTypeName(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const {
const coff_relocation *Reloc = toRel(Rel);
StringRef Res;
switch (getMachine()) {
case COFF::IMAGE_FILE_MACHINE_AMD64:
switch (Reloc->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:
Res = "Unknown";
}
break;
case COFF::IMAGE_FILE_MACHINE_ARMNT:
switch (Reloc->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_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);
default:
Res = "Unknown";
}
break;
case COFF::IMAGE_FILE_MACHINE_I386:
switch (Reloc->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:
Res = "Unknown";
}
break;
default:
Res = "Unknown";
}
Result.append(Res.begin(), Res.end());
return object_error::success;
}
#undef LLVM_COFF_SWITCH_RELOC_TYPE_NAME
std::error_code
COFFObjectFile::getRelocationValueString(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const {
const coff_relocation *Reloc = toRel(Rel);
DataRefImpl Sym;
ErrorOr<COFFSymbolRef> Symb = getSymbol(Reloc->SymbolTableIndex);
if (std::error_code EC = Symb.getError())
return EC;
Sym.p = reinterpret_cast<uintptr_t>(Symb->getRawPtr());
StringRef SymName;
if (std::error_code EC = getSymbolName(Sym, SymName))
return EC;
Result.append(SymName.begin(), SymName.end());
return object_error::success;
}
bool COFFObjectFile::isRelocatableObject() const {
return !DataDirectory;
}
bool ImportDirectoryEntryRef::
operator==(const ImportDirectoryEntryRef &Other) const {
return ImportTable == Other.ImportTable && Index == Other.Index;
}
void ImportDirectoryEntryRef::moveNext() {
++Index;
}
std::error_code ImportDirectoryEntryRef::getImportTableEntry(
const import_directory_table_entry *&Result) const {
Result = ImportTable + Index;
return object_error::success;
}
static imported_symbol_iterator
makeImportedSymbolIterator(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));
}
static imported_symbol_iterator
importedSymbolBegin(uint32_t RVA, const COFFObjectFile *Object) {
uintptr_t IntPtr = 0;
Object->getRvaPtr(RVA, IntPtr);
return makeImportedSymbolIterator(Object, IntPtr, 0);
}
static imported_symbol_iterator
importedSymbolEnd(uint32_t RVA, const COFFObjectFile *Object) {
uintptr_t IntPtr = 0;
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);
}
imported_symbol_iterator
ImportDirectoryEntryRef::imported_symbol_begin() const {
return importedSymbolBegin(ImportTable[Index].ImportLookupTableRVA,
OwningObject);
}
imported_symbol_iterator
ImportDirectoryEntryRef::imported_symbol_end() const {
return importedSymbolEnd(ImportTable[Index].ImportLookupTableRVA,
OwningObject);
}
iterator_range<imported_symbol_iterator>
ImportDirectoryEntryRef::imported_symbols() const {
return make_range(imported_symbol_begin(), imported_symbol_end());
}
std::error_code ImportDirectoryEntryRef::getName(StringRef &Result) const {
uintptr_t IntPtr = 0;
if (std::error_code EC =
OwningObject->getRvaPtr(ImportTable[Index].NameRVA, IntPtr))
return EC;
Result = StringRef(reinterpret_cast<const char *>(IntPtr));
return object_error::success;
}
std::error_code
ImportDirectoryEntryRef::getImportLookupTableRVA(uint32_t &Result) const {
Result = ImportTable[Index].ImportLookupTableRVA;
return object_error::success;
}
std::error_code
ImportDirectoryEntryRef::getImportAddressTableRVA(uint32_t &Result) const {
Result = ImportTable[Index].ImportAddressTableRVA;
return object_error::success;
}
std::error_code ImportDirectoryEntryRef::getImportLookupEntry(
const import_lookup_table_entry32 *&Result) const {
uintptr_t IntPtr = 0;
uint32_t RVA = ImportTable[Index].ImportLookupTableRVA;
if (std::error_code EC = OwningObject->getRvaPtr(RVA, IntPtr))
return EC;
Result = reinterpret_cast<const import_lookup_table_entry32 *>(IntPtr);
return object_error::success;
}
bool DelayImportDirectoryEntryRef::
operator==(const DelayImportDirectoryEntryRef &Other) const {
return Table == Other.Table && Index == Other.Index;
}
void DelayImportDirectoryEntryRef::moveNext() {
++Index;
}
imported_symbol_iterator
DelayImportDirectoryEntryRef::imported_symbol_begin() const {
return importedSymbolBegin(Table[Index].DelayImportNameTable,
OwningObject);
}
imported_symbol_iterator
DelayImportDirectoryEntryRef::imported_symbol_end() const {
return importedSymbolEnd(Table[Index].DelayImportNameTable,
OwningObject);
}
iterator_range<imported_symbol_iterator>
DelayImportDirectoryEntryRef::imported_symbols() const {
return make_range(imported_symbol_begin(), imported_symbol_end());
}
std::error_code DelayImportDirectoryEntryRef::getName(StringRef &Result) const {
uintptr_t IntPtr = 0;
if (std::error_code EC = OwningObject->getRvaPtr(Table[Index].Name, IntPtr))
return EC;
Result = StringRef(reinterpret_cast<const char *>(IntPtr));
return object_error::success;
}
std::error_code DelayImportDirectoryEntryRef::
getDelayImportTable(const delay_import_directory_table_entry *&Result) const {
Result = Table;
return object_error::success;
}
bool ExportDirectoryEntryRef::
operator==(const ExportDirectoryEntryRef &Other) const {
return ExportTable == Other.ExportTable && Index == Other.Index;
}
void ExportDirectoryEntryRef::moveNext() {
++Index;
}
// Returns the name of the current export symbol. If the symbol is exported only
// by ordinal, the empty string is set as a result.
std::error_code ExportDirectoryEntryRef::getDllName(StringRef &Result) const {
uintptr_t IntPtr = 0;
if (std::error_code EC =
OwningObject->getRvaPtr(ExportTable->NameRVA, IntPtr))
return EC;
Result = StringRef(reinterpret_cast<const char *>(IntPtr));
return object_error::success;
}
// Returns the starting ordinal number.
std::error_code
ExportDirectoryEntryRef::getOrdinalBase(uint32_t &Result) const {
Result = ExportTable->OrdinalBase;
return object_error::success;
}
// Returns the export ordinal of the current export symbol.
std::error_code ExportDirectoryEntryRef::getOrdinal(uint32_t &Result) const {
Result = ExportTable->OrdinalBase + Index;
return object_error::success;
}
// Returns the address of the current export symbol.
std::error_code ExportDirectoryEntryRef::getExportRVA(uint32_t &Result) const {
uintptr_t IntPtr = 0;
if (std::error_code 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 object_error::success;
}
// Returns the name of the current export symbol. If the symbol is exported only
// by ordinal, the empty string is set as a result.
std::error_code
ExportDirectoryEntryRef::getSymbolName(StringRef &Result) const {
uintptr_t IntPtr = 0;
if (std::error_code 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 (std::error_code EC =
OwningObject->getRvaPtr(ExportTable->NamePointerRVA, IntPtr))
return EC;
const ulittle32_t *NamePtr = reinterpret_cast<const ulittle32_t *>(IntPtr);
if (std::error_code EC = OwningObject->getRvaPtr(NamePtr[Offset], IntPtr))
return EC;
Result = StringRef(reinterpret_cast<const char *>(IntPtr));
return object_error::success;
}
Result = "";
return object_error::success;
}
bool ImportedSymbolRef::
operator==(const ImportedSymbolRef &Other) const {
return Entry32 == Other.Entry32 && Entry64 == Other.Entry64
&& Index == Other.Index;
}
void ImportedSymbolRef::moveNext() {
++Index;
}
std::error_code
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 object_error::success;
RVA = Entry32[Index].getHintNameRVA();
} else {
if (Entry64[Index].isOrdinal())
return object_error::success;
RVA = Entry64[Index].getHintNameRVA();
}
uintptr_t IntPtr = 0;
if (std::error_code EC = OwningObject->getRvaPtr(RVA, IntPtr))
return EC;
// +2 because the first two bytes is hint.
Result = StringRef(reinterpret_cast<const char *>(IntPtr + 2));
return object_error::success;
}
std::error_code ImportedSymbolRef::getOrdinal(uint16_t &Result) const {
uint32_t RVA;
if (Entry32) {
if (Entry32[Index].isOrdinal()) {
Result = Entry32[Index].getOrdinal();
return object_error::success;
}
RVA = Entry32[Index].getHintNameRVA();
} else {
if (Entry64[Index].isOrdinal()) {
Result = Entry64[Index].getOrdinal();
return object_error::success;
}
RVA = Entry64[Index].getHintNameRVA();
}
uintptr_t IntPtr = 0;
if (std::error_code EC = OwningObject->getRvaPtr(RVA, IntPtr))
return EC;
Result = *reinterpret_cast<const ulittle16_t *>(IntPtr);
return object_error::success;
}
ErrorOr<std::unique_ptr<COFFObjectFile>>
ObjectFile::createCOFFObjectFile(MemoryBufferRef Object) {
std::error_code EC;
std::unique_ptr<COFFObjectFile> Ret(new COFFObjectFile(Object, EC));
if (EC)
return EC;
return std::move(Ret);
}
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