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XCOFFObjectFile.cpp
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//===--- XCOFFObjectFile.cpp - XCOFF object file implementation -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the XCOFFObjectFile class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/XCOFFObjectFile.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/TargetParser/SubtargetFeature.h"
#include <cstddef>
#include <cstring>
namespace llvm {
using namespace XCOFF;
namespace object {
static const uint8_t FunctionSym = 0x20;
static const uint16_t NoRelMask = 0x0001;
static const size_t SymbolAuxTypeOffset = 17;
// Checks that [Ptr, Ptr + Size) bytes fall inside the memory buffer
// 'M'. Returns a pointer to the underlying object on success.
template <typename T>
static Expected<const T *> getObject(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 std::move(E);
return reinterpret_cast<const T *>(Addr);
}
static uintptr_t getWithOffset(uintptr_t Base, ptrdiff_t Offset) {
return reinterpret_cast<uintptr_t>(reinterpret_cast<const char *>(Base) +
Offset);
}
template <typename T> static const T *viewAs(uintptr_t in) {
return reinterpret_cast<const T *>(in);
}
static StringRef generateXCOFFFixedNameStringRef(const char *Name) {
auto NulCharPtr =
static_cast<const char *>(memchr(Name, '\0', XCOFF::NameSize));
return NulCharPtr ? StringRef(Name, NulCharPtr - Name)
: StringRef(Name, XCOFF::NameSize);
}
template <typename T> StringRef XCOFFSectionHeader<T>::getName() const {
const T &DerivedXCOFFSectionHeader = static_cast<const T &>(*this);
return generateXCOFFFixedNameStringRef(DerivedXCOFFSectionHeader.Name);
}
template <typename T> uint16_t XCOFFSectionHeader<T>::getSectionType() const {
const T &DerivedXCOFFSectionHeader = static_cast<const T &>(*this);
return DerivedXCOFFSectionHeader.Flags & SectionFlagsTypeMask;
}
template <typename T>
bool XCOFFSectionHeader<T>::isReservedSectionType() const {
return getSectionType() & SectionFlagsReservedMask;
}
template <typename AddressType>
bool XCOFFRelocation<AddressType>::isRelocationSigned() const {
return Info & XR_SIGN_INDICATOR_MASK;
}
template <typename AddressType>
bool XCOFFRelocation<AddressType>::isFixupIndicated() const {
return Info & XR_FIXUP_INDICATOR_MASK;
}
template <typename AddressType>
uint8_t XCOFFRelocation<AddressType>::getRelocatedLength() const {
// The relocation encodes the bit length being relocated minus 1. Add back
// the 1 to get the actual length being relocated.
return (Info & XR_BIASED_LENGTH_MASK) + 1;
}
template struct ExceptionSectionEntry<support::ubig32_t>;
template struct ExceptionSectionEntry<support::ubig64_t>;
template <typename T>
Expected<StringRef> getLoaderSecSymNameInStrTbl(const T *LoaderSecHeader,
uint64_t Offset) {
if (LoaderSecHeader->LengthOfStrTbl > Offset)
return (reinterpret_cast<const char *>(LoaderSecHeader) +
LoaderSecHeader->OffsetToStrTbl + Offset);
return createError("entry with offset 0x" + Twine::utohexstr(Offset) +
" in the loader section's string table with size 0x" +
Twine::utohexstr(LoaderSecHeader->LengthOfStrTbl) +
" is invalid");
}
Expected<StringRef> LoaderSectionSymbolEntry32::getSymbolName(
const LoaderSectionHeader32 *LoaderSecHeader32) const {
const NameOffsetInStrTbl *NameInStrTbl =
reinterpret_cast<const NameOffsetInStrTbl *>(SymbolName);
if (NameInStrTbl->IsNameInStrTbl != XCOFFSymbolRef::NAME_IN_STR_TBL_MAGIC)
return generateXCOFFFixedNameStringRef(SymbolName);
return getLoaderSecSymNameInStrTbl(LoaderSecHeader32, NameInStrTbl->Offset);
}
Expected<StringRef> LoaderSectionSymbolEntry64::getSymbolName(
const LoaderSectionHeader64 *LoaderSecHeader64) const {
return getLoaderSecSymNameInStrTbl(LoaderSecHeader64, Offset);
}
uintptr_t
XCOFFObjectFile::getAdvancedSymbolEntryAddress(uintptr_t CurrentAddress,
uint32_t Distance) {
return getWithOffset(CurrentAddress, Distance * XCOFF::SymbolTableEntrySize);
}
const XCOFF::SymbolAuxType *
XCOFFObjectFile::getSymbolAuxType(uintptr_t AuxEntryAddress) const {
assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
return viewAs<XCOFF::SymbolAuxType>(
getWithOffset(AuxEntryAddress, SymbolAuxTypeOffset));
}
void XCOFFObjectFile::checkSectionAddress(uintptr_t Addr,
uintptr_t TableAddress) const {
if (Addr < TableAddress)
report_fatal_error("Section header outside of section header table.");
uintptr_t Offset = Addr - TableAddress;
if (Offset >= getSectionHeaderSize() * getNumberOfSections())
report_fatal_error("Section header outside of section header table.");
if (Offset % getSectionHeaderSize() != 0)
report_fatal_error(
"Section header pointer does not point to a valid section header.");
}
const XCOFFSectionHeader32 *
XCOFFObjectFile::toSection32(DataRefImpl Ref) const {
assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
#ifndef NDEBUG
checkSectionAddress(Ref.p, getSectionHeaderTableAddress());
#endif
return viewAs<XCOFFSectionHeader32>(Ref.p);
}
const XCOFFSectionHeader64 *
XCOFFObjectFile::toSection64(DataRefImpl Ref) const {
assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
#ifndef NDEBUG
checkSectionAddress(Ref.p, getSectionHeaderTableAddress());
#endif
return viewAs<XCOFFSectionHeader64>(Ref.p);
}
XCOFFSymbolRef XCOFFObjectFile::toSymbolRef(DataRefImpl Ref) const {
assert(Ref.p != 0 && "Symbol table pointer can not be nullptr!");
#ifndef NDEBUG
checkSymbolEntryPointer(Ref.p);
#endif
return XCOFFSymbolRef(Ref, this);
}
const XCOFFFileHeader32 *XCOFFObjectFile::fileHeader32() const {
assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
return static_cast<const XCOFFFileHeader32 *>(FileHeader);
}
const XCOFFFileHeader64 *XCOFFObjectFile::fileHeader64() const {
assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
return static_cast<const XCOFFFileHeader64 *>(FileHeader);
}
const XCOFFAuxiliaryHeader32 *XCOFFObjectFile::auxiliaryHeader32() const {
assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
return static_cast<const XCOFFAuxiliaryHeader32 *>(AuxiliaryHeader);
}
const XCOFFAuxiliaryHeader64 *XCOFFObjectFile::auxiliaryHeader64() const {
assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
return static_cast<const XCOFFAuxiliaryHeader64 *>(AuxiliaryHeader);
}
template <typename T> const T *XCOFFObjectFile::sectionHeaderTable() const {
return static_cast<const T *>(SectionHeaderTable);
}
const XCOFFSectionHeader32 *
XCOFFObjectFile::sectionHeaderTable32() const {
assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
return static_cast<const XCOFFSectionHeader32 *>(SectionHeaderTable);
}
const XCOFFSectionHeader64 *
XCOFFObjectFile::sectionHeaderTable64() const {
assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
return static_cast<const XCOFFSectionHeader64 *>(SectionHeaderTable);
}
void XCOFFObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
uintptr_t NextSymbolAddr = getAdvancedSymbolEntryAddress(
Symb.p, toSymbolRef(Symb).getNumberOfAuxEntries() + 1);
#ifndef NDEBUG
// This function is used by basic_symbol_iterator, which allows to
// point to the end-of-symbol-table address.
if (NextSymbolAddr != getEndOfSymbolTableAddress())
checkSymbolEntryPointer(NextSymbolAddr);
#endif
Symb.p = NextSymbolAddr;
}
Expected<StringRef>
XCOFFObjectFile::getStringTableEntry(uint32_t Offset) const {
// The byte offset is relative to the start of the string table.
// A byte offset value of 0 is a null or zero-length symbol
// name. A byte offset in the range 1 to 3 (inclusive) points into the length
// field; as a soft-error recovery mechanism, we treat such cases as having an
// offset of 0.
if (Offset < 4)
return StringRef(nullptr, 0);
if (StringTable.Data != nullptr && StringTable.Size > Offset)
return (StringTable.Data + Offset);
return createError("entry with offset 0x" + Twine::utohexstr(Offset) +
" in a string table with size 0x" +
Twine::utohexstr(StringTable.Size) + " is invalid");
}
StringRef XCOFFObjectFile::getStringTable() const {
// If the size is less than or equal to 4, then the string table contains no
// string data.
return StringRef(StringTable.Data,
StringTable.Size <= 4 ? 0 : StringTable.Size);
}
Expected<StringRef>
XCOFFObjectFile::getCFileName(const XCOFFFileAuxEnt *CFileEntPtr) const {
if (CFileEntPtr->NameInStrTbl.Magic != XCOFFSymbolRef::NAME_IN_STR_TBL_MAGIC)
return generateXCOFFFixedNameStringRef(CFileEntPtr->Name);
return getStringTableEntry(CFileEntPtr->NameInStrTbl.Offset);
}
Expected<StringRef> XCOFFObjectFile::getSymbolName(DataRefImpl Symb) const {
return toSymbolRef(Symb).getName();
}
Expected<uint64_t> XCOFFObjectFile::getSymbolAddress(DataRefImpl Symb) const {
return toSymbolRef(Symb).getValue();
}
uint64_t XCOFFObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
return toSymbolRef(Symb).getValue();
}
uint32_t XCOFFObjectFile::getSymbolAlignment(DataRefImpl Symb) const {
uint64_t Result = 0;
XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb);
if (XCOFFSym.isCsectSymbol()) {
Expected<XCOFFCsectAuxRef> CsectAuxRefOrError =
XCOFFSym.getXCOFFCsectAuxRef();
if (!CsectAuxRefOrError)
// TODO: report the error up the stack.
consumeError(CsectAuxRefOrError.takeError());
else
Result = 1ULL << CsectAuxRefOrError.get().getAlignmentLog2();
}
return Result;
}
uint64_t XCOFFObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
uint64_t Result = 0;
XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb);
if (XCOFFSym.isCsectSymbol()) {
Expected<XCOFFCsectAuxRef> CsectAuxRefOrError =
XCOFFSym.getXCOFFCsectAuxRef();
if (!CsectAuxRefOrError)
// TODO: report the error up the stack.
consumeError(CsectAuxRefOrError.takeError());
else {
XCOFFCsectAuxRef CsectAuxRef = CsectAuxRefOrError.get();
assert(CsectAuxRef.getSymbolType() == XCOFF::XTY_CM);
Result = CsectAuxRef.getSectionOrLength();
}
}
return Result;
}
Expected<SymbolRef::Type>
XCOFFObjectFile::getSymbolType(DataRefImpl Symb) const {
XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb);
Expected<bool> IsFunction = XCOFFSym.isFunction();
if (!IsFunction)
return IsFunction.takeError();
if (*IsFunction)
return SymbolRef::ST_Function;
if (XCOFF::C_FILE == XCOFFSym.getStorageClass())
return SymbolRef::ST_File;
int16_t SecNum = XCOFFSym.getSectionNumber();
if (SecNum <= 0)
return SymbolRef::ST_Other;
Expected<DataRefImpl> SecDRIOrErr =
getSectionByNum(XCOFFSym.getSectionNumber());
if (!SecDRIOrErr)
return SecDRIOrErr.takeError();
DataRefImpl SecDRI = SecDRIOrErr.get();
Expected<StringRef> SymNameOrError = XCOFFSym.getName();
if (SymNameOrError) {
// The "TOC" symbol is treated as SymbolRef::ST_Other.
if (SymNameOrError.get() == "TOC")
return SymbolRef::ST_Other;
// The symbol for a section name is treated as SymbolRef::ST_Other.
StringRef SecName;
if (is64Bit())
SecName = XCOFFObjectFile::toSection64(SecDRIOrErr.get())->getName();
else
SecName = XCOFFObjectFile::toSection32(SecDRIOrErr.get())->getName();
if (SecName == SymNameOrError.get())
return SymbolRef::ST_Other;
} else
return SymNameOrError.takeError();
if (isSectionData(SecDRI) || isSectionBSS(SecDRI))
return SymbolRef::ST_Data;
if (isDebugSection(SecDRI))
return SymbolRef::ST_Debug;
return SymbolRef::ST_Other;
}
Expected<section_iterator>
XCOFFObjectFile::getSymbolSection(DataRefImpl Symb) const {
const int16_t SectNum = toSymbolRef(Symb).getSectionNumber();
if (isReservedSectionNumber(SectNum))
return section_end();
Expected<DataRefImpl> ExpSec = getSectionByNum(SectNum);
if (!ExpSec)
return ExpSec.takeError();
return section_iterator(SectionRef(ExpSec.get(), this));
}
void XCOFFObjectFile::moveSectionNext(DataRefImpl &Sec) const {
const char *Ptr = reinterpret_cast<const char *>(Sec.p);
Sec.p = reinterpret_cast<uintptr_t>(Ptr + getSectionHeaderSize());
}
Expected<StringRef> XCOFFObjectFile::getSectionName(DataRefImpl Sec) const {
return generateXCOFFFixedNameStringRef(getSectionNameInternal(Sec));
}
uint64_t XCOFFObjectFile::getSectionAddress(DataRefImpl Sec) const {
// Avoid ternary due to failure to convert the ubig32_t value to a unit64_t
// with MSVC.
if (is64Bit())
return toSection64(Sec)->VirtualAddress;
return toSection32(Sec)->VirtualAddress;
}
uint64_t XCOFFObjectFile::getSectionIndex(DataRefImpl Sec) const {
// Section numbers in XCOFF are numbered beginning at 1. A section number of
// zero is used to indicate that a symbol is being imported or is undefined.
if (is64Bit())
return toSection64(Sec) - sectionHeaderTable64() + 1;
else
return toSection32(Sec) - sectionHeaderTable32() + 1;
}
uint64_t XCOFFObjectFile::getSectionSize(DataRefImpl Sec) const {
// Avoid ternary due to failure to convert the ubig32_t value to a unit64_t
// with MSVC.
if (is64Bit())
return toSection64(Sec)->SectionSize;
return toSection32(Sec)->SectionSize;
}
Expected<ArrayRef<uint8_t>>
XCOFFObjectFile::getSectionContents(DataRefImpl Sec) const {
if (isSectionVirtual(Sec))
return ArrayRef<uint8_t>();
uint64_t OffsetToRaw;
if (is64Bit())
OffsetToRaw = toSection64(Sec)->FileOffsetToRawData;
else
OffsetToRaw = toSection32(Sec)->FileOffsetToRawData;
const uint8_t * ContentStart = base() + OffsetToRaw;
uint64_t SectionSize = getSectionSize(Sec);
if (Error E = Binary::checkOffset(
Data, reinterpret_cast<uintptr_t>(ContentStart), SectionSize))
return createError(
toString(std::move(E)) + ": section data with offset 0x" +
Twine::utohexstr(OffsetToRaw) + " and size 0x" +
Twine::utohexstr(SectionSize) + " goes past the end of the file");
return ArrayRef(ContentStart, SectionSize);
}
uint64_t XCOFFObjectFile::getSectionAlignment(DataRefImpl Sec) const {
uint64_t Result = 0;
llvm_unreachable("Not yet implemented!");
return Result;
}
uint64_t XCOFFObjectFile::getSectionFileOffsetToRawData(DataRefImpl Sec) const {
if (is64Bit())
return toSection64(Sec)->FileOffsetToRawData;
return toSection32(Sec)->FileOffsetToRawData;
}
Expected<uintptr_t> XCOFFObjectFile::getSectionFileOffsetToRawData(
XCOFF::SectionTypeFlags SectType) const {
DataRefImpl DRI = getSectionByType(SectType);
if (DRI.p == 0) // No section is not an error.
return 0;
uint64_t SectionOffset = getSectionFileOffsetToRawData(DRI);
uint64_t SizeOfSection = getSectionSize(DRI);
uintptr_t SectionStart = reinterpret_cast<uintptr_t>(base() + SectionOffset);
if (Error E = Binary::checkOffset(Data, SectionStart, SizeOfSection)) {
SmallString<32> UnknownType;
Twine(("<Unknown:") + Twine::utohexstr(SectType) + ">")
.toVector(UnknownType);
const char *SectionName = UnknownType.c_str();
switch (SectType) {
#define ECASE(Value, String) \
case XCOFF::Value: \
SectionName = String; \
break
ECASE(STYP_PAD, "pad");
ECASE(STYP_DWARF, "dwarf");
ECASE(STYP_TEXT, "text");
ECASE(STYP_DATA, "data");
ECASE(STYP_BSS, "bss");
ECASE(STYP_EXCEPT, "expect");
ECASE(STYP_INFO, "info");
ECASE(STYP_TDATA, "tdata");
ECASE(STYP_TBSS, "tbss");
ECASE(STYP_LOADER, "loader");
ECASE(STYP_DEBUG, "debug");
ECASE(STYP_TYPCHK, "typchk");
ECASE(STYP_OVRFLO, "ovrflo");
#undef ECASE
}
return createError(toString(std::move(E)) + ": " + SectionName +
" section with offset 0x" +
Twine::utohexstr(SectionOffset) + " and size 0x" +
Twine::utohexstr(SizeOfSection) +
" goes past the end of the file");
}
return SectionStart;
}
bool XCOFFObjectFile::isSectionCompressed(DataRefImpl Sec) const {
return false;
}
bool XCOFFObjectFile::isSectionText(DataRefImpl Sec) const {
return getSectionFlags(Sec) & XCOFF::STYP_TEXT;
}
bool XCOFFObjectFile::isSectionData(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(Sec);
return Flags & (XCOFF::STYP_DATA | XCOFF::STYP_TDATA);
}
bool XCOFFObjectFile::isSectionBSS(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(Sec);
return Flags & (XCOFF::STYP_BSS | XCOFF::STYP_TBSS);
}
bool XCOFFObjectFile::isDebugSection(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(Sec);
return Flags & (XCOFF::STYP_DEBUG | XCOFF::STYP_DWARF);
}
bool XCOFFObjectFile::isSectionVirtual(DataRefImpl Sec) const {
return is64Bit() ? toSection64(Sec)->FileOffsetToRawData == 0
: toSection32(Sec)->FileOffsetToRawData == 0;
}
relocation_iterator XCOFFObjectFile::section_rel_begin(DataRefImpl Sec) const {
DataRefImpl Ret;
if (is64Bit()) {
const XCOFFSectionHeader64 *SectionEntPtr = toSection64(Sec);
auto RelocationsOrErr =
relocations<XCOFFSectionHeader64, XCOFFRelocation64>(*SectionEntPtr);
if (Error E = RelocationsOrErr.takeError()) {
// TODO: report the error up the stack.
consumeError(std::move(E));
return relocation_iterator(RelocationRef());
}
Ret.p = reinterpret_cast<uintptr_t>(&*RelocationsOrErr.get().begin());
} else {
const XCOFFSectionHeader32 *SectionEntPtr = toSection32(Sec);
auto RelocationsOrErr =
relocations<XCOFFSectionHeader32, XCOFFRelocation32>(*SectionEntPtr);
if (Error E = RelocationsOrErr.takeError()) {
// TODO: report the error up the stack.
consumeError(std::move(E));
return relocation_iterator(RelocationRef());
}
Ret.p = reinterpret_cast<uintptr_t>(&*RelocationsOrErr.get().begin());
}
return relocation_iterator(RelocationRef(Ret, this));
}
relocation_iterator XCOFFObjectFile::section_rel_end(DataRefImpl Sec) const {
DataRefImpl Ret;
if (is64Bit()) {
const XCOFFSectionHeader64 *SectionEntPtr = toSection64(Sec);
auto RelocationsOrErr =
relocations<XCOFFSectionHeader64, XCOFFRelocation64>(*SectionEntPtr);
if (Error E = RelocationsOrErr.takeError()) {
// TODO: report the error up the stack.
consumeError(std::move(E));
return relocation_iterator(RelocationRef());
}
Ret.p = reinterpret_cast<uintptr_t>(&*RelocationsOrErr.get().end());
} else {
const XCOFFSectionHeader32 *SectionEntPtr = toSection32(Sec);
auto RelocationsOrErr =
relocations<XCOFFSectionHeader32, XCOFFRelocation32>(*SectionEntPtr);
if (Error E = RelocationsOrErr.takeError()) {
// TODO: report the error up the stack.
consumeError(std::move(E));
return relocation_iterator(RelocationRef());
}
Ret.p = reinterpret_cast<uintptr_t>(&*RelocationsOrErr.get().end());
}
return relocation_iterator(RelocationRef(Ret, this));
}
void XCOFFObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
if (is64Bit())
Rel.p = reinterpret_cast<uintptr_t>(viewAs<XCOFFRelocation64>(Rel.p) + 1);
else
Rel.p = reinterpret_cast<uintptr_t>(viewAs<XCOFFRelocation32>(Rel.p) + 1);
}
uint64_t XCOFFObjectFile::getRelocationOffset(DataRefImpl Rel) const {
if (is64Bit()) {
const XCOFFRelocation64 *Reloc = viewAs<XCOFFRelocation64>(Rel.p);
const XCOFFSectionHeader64 *Sec64 = sectionHeaderTable64();
const uint64_t RelocAddress = Reloc->VirtualAddress;
const uint16_t NumberOfSections = getNumberOfSections();
for (uint16_t I = 0; I < NumberOfSections; ++I) {
// Find which section this relocation belongs to, and get the
// relocation offset relative to the start of the section.
if (Sec64->VirtualAddress <= RelocAddress &&
RelocAddress < Sec64->VirtualAddress + Sec64->SectionSize) {
return RelocAddress - Sec64->VirtualAddress;
}
++Sec64;
}
} else {
const XCOFFRelocation32 *Reloc = viewAs<XCOFFRelocation32>(Rel.p);
const XCOFFSectionHeader32 *Sec32 = sectionHeaderTable32();
const uint32_t RelocAddress = Reloc->VirtualAddress;
const uint16_t NumberOfSections = getNumberOfSections();
for (uint16_t I = 0; I < NumberOfSections; ++I) {
// Find which section this relocation belongs to, and get the
// relocation offset relative to the start of the section.
if (Sec32->VirtualAddress <= RelocAddress &&
RelocAddress < Sec32->VirtualAddress + Sec32->SectionSize) {
return RelocAddress - Sec32->VirtualAddress;
}
++Sec32;
}
}
return InvalidRelocOffset;
}
symbol_iterator XCOFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
uint32_t Index;
if (is64Bit()) {
const XCOFFRelocation64 *Reloc = viewAs<XCOFFRelocation64>(Rel.p);
Index = Reloc->SymbolIndex;
if (Index >= getNumberOfSymbolTableEntries64())
return symbol_end();
} else {
const XCOFFRelocation32 *Reloc = viewAs<XCOFFRelocation32>(Rel.p);
Index = Reloc->SymbolIndex;
if (Index >= getLogicalNumberOfSymbolTableEntries32())
return symbol_end();
}
DataRefImpl SymDRI;
SymDRI.p = getSymbolEntryAddressByIndex(Index);
return symbol_iterator(SymbolRef(SymDRI, this));
}
uint64_t XCOFFObjectFile::getRelocationType(DataRefImpl Rel) const {
if (is64Bit())
return viewAs<XCOFFRelocation64>(Rel.p)->Type;
return viewAs<XCOFFRelocation32>(Rel.p)->Type;
}
void XCOFFObjectFile::getRelocationTypeName(
DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
StringRef Res;
if (is64Bit()) {
const XCOFFRelocation64 *Reloc = viewAs<XCOFFRelocation64>(Rel.p);
Res = XCOFF::getRelocationTypeString(Reloc->Type);
} else {
const XCOFFRelocation32 *Reloc = viewAs<XCOFFRelocation32>(Rel.p);
Res = XCOFF::getRelocationTypeString(Reloc->Type);
}
Result.append(Res.begin(), Res.end());
}
Expected<uint32_t> XCOFFObjectFile::getSymbolFlags(DataRefImpl Symb) const {
XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb);
uint32_t Result = SymbolRef::SF_None;
if (XCOFFSym.getSectionNumber() == XCOFF::N_ABS)
Result |= SymbolRef::SF_Absolute;
XCOFF::StorageClass SC = XCOFFSym.getStorageClass();
if (XCOFF::C_EXT == SC || XCOFF::C_WEAKEXT == SC)
Result |= SymbolRef::SF_Global;
if (XCOFF::C_WEAKEXT == SC)
Result |= SymbolRef::SF_Weak;
if (XCOFFSym.isCsectSymbol()) {
Expected<XCOFFCsectAuxRef> CsectAuxEntOrErr =
XCOFFSym.getXCOFFCsectAuxRef();
if (CsectAuxEntOrErr) {
if (CsectAuxEntOrErr.get().getSymbolType() == XCOFF::XTY_CM)
Result |= SymbolRef::SF_Common;
} else
return CsectAuxEntOrErr.takeError();
}
if (XCOFFSym.getSectionNumber() == XCOFF::N_UNDEF)
Result |= SymbolRef::SF_Undefined;
// There is no visibility in old 32 bit XCOFF object file interpret.
if (is64Bit() || (auxiliaryHeader32() && (auxiliaryHeader32()->getVersion() ==
NEW_XCOFF_INTERPRET))) {
uint16_t SymType = XCOFFSym.getSymbolType();
if ((SymType & VISIBILITY_MASK) == SYM_V_HIDDEN)
Result |= SymbolRef::SF_Hidden;
if ((SymType & VISIBILITY_MASK) == SYM_V_EXPORTED)
Result |= SymbolRef::SF_Exported;
}
return Result;
}
basic_symbol_iterator XCOFFObjectFile::symbol_begin() const {
DataRefImpl SymDRI;
SymDRI.p = reinterpret_cast<uintptr_t>(SymbolTblPtr);
return basic_symbol_iterator(SymbolRef(SymDRI, this));
}
basic_symbol_iterator XCOFFObjectFile::symbol_end() const {
DataRefImpl SymDRI;
const uint32_t NumberOfSymbolTableEntries = getNumberOfSymbolTableEntries();
SymDRI.p = getSymbolEntryAddressByIndex(NumberOfSymbolTableEntries);
return basic_symbol_iterator(SymbolRef(SymDRI, this));
}
XCOFFObjectFile::xcoff_symbol_iterator_range XCOFFObjectFile::symbols() const {
return xcoff_symbol_iterator_range(symbol_begin(), symbol_end());
}
section_iterator XCOFFObjectFile::section_begin() const {
DataRefImpl DRI;
DRI.p = getSectionHeaderTableAddress();
return section_iterator(SectionRef(DRI, this));
}
section_iterator XCOFFObjectFile::section_end() const {
DataRefImpl DRI;
DRI.p = getWithOffset(getSectionHeaderTableAddress(),
getNumberOfSections() * getSectionHeaderSize());
return section_iterator(SectionRef(DRI, this));
}
uint8_t XCOFFObjectFile::getBytesInAddress() const { return is64Bit() ? 8 : 4; }
StringRef XCOFFObjectFile::getFileFormatName() const {
return is64Bit() ? "aix5coff64-rs6000" : "aixcoff-rs6000";
}
Triple::ArchType XCOFFObjectFile::getArch() const {
return is64Bit() ? Triple::ppc64 : Triple::ppc;
}
Expected<SubtargetFeatures> XCOFFObjectFile::getFeatures() const {
return SubtargetFeatures();
}
bool XCOFFObjectFile::isRelocatableObject() const {
if (is64Bit())
return !(fileHeader64()->Flags & NoRelMask);
return !(fileHeader32()->Flags & NoRelMask);
}
Expected<uint64_t> XCOFFObjectFile::getStartAddress() const {
// TODO FIXME Should get from auxiliary_header->o_entry when support for the
// auxiliary_header is added.
return 0;
}
StringRef XCOFFObjectFile::mapDebugSectionName(StringRef Name) const {
return StringSwitch<StringRef>(Name)
.Case("dwinfo", "debug_info")
.Case("dwline", "debug_line")
.Case("dwpbnms", "debug_pubnames")
.Case("dwpbtyp", "debug_pubtypes")
.Case("dwarnge", "debug_aranges")
.Case("dwabrev", "debug_abbrev")
.Case("dwstr", "debug_str")
.Case("dwrnges", "debug_ranges")
.Case("dwloc", "debug_loc")
.Case("dwframe", "debug_frame")
.Case("dwmac", "debug_macinfo")
.Default(Name);
}
size_t XCOFFObjectFile::getFileHeaderSize() const {
return is64Bit() ? sizeof(XCOFFFileHeader64) : sizeof(XCOFFFileHeader32);
}
size_t XCOFFObjectFile::getSectionHeaderSize() const {
return is64Bit() ? sizeof(XCOFFSectionHeader64) :
sizeof(XCOFFSectionHeader32);
}
bool XCOFFObjectFile::is64Bit() const {
return Binary::ID_XCOFF64 == getType();
}
Expected<StringRef> XCOFFObjectFile::getRawData(const char *Start,
uint64_t Size,
StringRef Name) const {
uintptr_t StartPtr = reinterpret_cast<uintptr_t>(Start);
// TODO: this path is untested.
if (Error E = Binary::checkOffset(Data, StartPtr, Size))
return createError(toString(std::move(E)) + ": " + Name.data() +
" data with offset 0x" + Twine::utohexstr(StartPtr) +
" and size 0x" + Twine::utohexstr(Size) +
" goes past the end of the file");
return StringRef(Start, Size);
}
uint16_t XCOFFObjectFile::getMagic() const {
return is64Bit() ? fileHeader64()->Magic : fileHeader32()->Magic;
}
Expected<DataRefImpl> XCOFFObjectFile::getSectionByNum(int16_t Num) const {
if (Num <= 0 || Num > getNumberOfSections())
return createStringError(object_error::invalid_section_index,
"the section index (" + Twine(Num) +
") is invalid");
DataRefImpl DRI;
DRI.p = getWithOffset(getSectionHeaderTableAddress(),
getSectionHeaderSize() * (Num - 1));
return DRI;
}
DataRefImpl
XCOFFObjectFile::getSectionByType(XCOFF::SectionTypeFlags SectType) const {
DataRefImpl DRI;
auto GetSectionAddr = [&](const auto &Sections) -> uintptr_t {
for (const auto &Sec : Sections)
if (Sec.getSectionType() == SectType)
return reinterpret_cast<uintptr_t>(&Sec);
return uintptr_t(0);
};
if (is64Bit())
DRI.p = GetSectionAddr(sections64());
else
DRI.p = GetSectionAddr(sections32());
return DRI;
}
Expected<StringRef>
XCOFFObjectFile::getSymbolSectionName(XCOFFSymbolRef SymEntPtr) const {
const int16_t SectionNum = SymEntPtr.getSectionNumber();
switch (SectionNum) {
case XCOFF::N_DEBUG:
return "N_DEBUG";
case XCOFF::N_ABS:
return "N_ABS";
case XCOFF::N_UNDEF:
return "N_UNDEF";
default:
Expected<DataRefImpl> SecRef = getSectionByNum(SectionNum);
if (SecRef)
return generateXCOFFFixedNameStringRef(
getSectionNameInternal(SecRef.get()));
return SecRef.takeError();
}
}
unsigned XCOFFObjectFile::getSymbolSectionID(SymbolRef Sym) const {
XCOFFSymbolRef XCOFFSymRef(Sym.getRawDataRefImpl(), this);
return XCOFFSymRef.getSectionNumber();
}
bool XCOFFObjectFile::isReservedSectionNumber(int16_t SectionNumber) {
return (SectionNumber <= 0 && SectionNumber >= -2);
}
uint16_t XCOFFObjectFile::getNumberOfSections() const {
return is64Bit() ? fileHeader64()->NumberOfSections
: fileHeader32()->NumberOfSections;
}
int32_t XCOFFObjectFile::getTimeStamp() const {
return is64Bit() ? fileHeader64()->TimeStamp : fileHeader32()->TimeStamp;
}
uint16_t XCOFFObjectFile::getOptionalHeaderSize() const {
return is64Bit() ? fileHeader64()->AuxHeaderSize
: fileHeader32()->AuxHeaderSize;
}
uint32_t XCOFFObjectFile::getSymbolTableOffset32() const {
return fileHeader32()->SymbolTableOffset;
}
int32_t XCOFFObjectFile::getRawNumberOfSymbolTableEntries32() const {
// As far as symbol table size is concerned, if this field is negative it is
// to be treated as a 0. However since this field is also used for printing we
// don't want to truncate any negative values.
return fileHeader32()->NumberOfSymTableEntries;
}
uint32_t XCOFFObjectFile::getLogicalNumberOfSymbolTableEntries32() const {
return (fileHeader32()->NumberOfSymTableEntries >= 0
? fileHeader32()->NumberOfSymTableEntries
: 0);
}
uint64_t XCOFFObjectFile::getSymbolTableOffset64() const {
return fileHeader64()->SymbolTableOffset;
}
uint32_t XCOFFObjectFile::getNumberOfSymbolTableEntries64() const {
return fileHeader64()->NumberOfSymTableEntries;
}
uint32_t XCOFFObjectFile::getNumberOfSymbolTableEntries() const {
return is64Bit() ? getNumberOfSymbolTableEntries64()
: getLogicalNumberOfSymbolTableEntries32();
}
uintptr_t XCOFFObjectFile::getEndOfSymbolTableAddress() const {
const uint32_t NumberOfSymTableEntries = getNumberOfSymbolTableEntries();
return getWithOffset(reinterpret_cast<uintptr_t>(SymbolTblPtr),
XCOFF::SymbolTableEntrySize * NumberOfSymTableEntries);
}
void XCOFFObjectFile::checkSymbolEntryPointer(uintptr_t SymbolEntPtr) const {
if (SymbolEntPtr < reinterpret_cast<uintptr_t>(SymbolTblPtr))
report_fatal_error("Symbol table entry is outside of symbol table.");
if (SymbolEntPtr >= getEndOfSymbolTableAddress())
report_fatal_error("Symbol table entry is outside of symbol table.");
ptrdiff_t Offset = reinterpret_cast<const char *>(SymbolEntPtr) -
reinterpret_cast<const char *>(SymbolTblPtr);
if (Offset % XCOFF::SymbolTableEntrySize != 0)
report_fatal_error(
"Symbol table entry position is not valid inside of symbol table.");
}
uint32_t XCOFFObjectFile::getSymbolIndex(uintptr_t SymbolEntPtr) const {
return (reinterpret_cast<const char *>(SymbolEntPtr) -
reinterpret_cast<const char *>(SymbolTblPtr)) /
XCOFF::SymbolTableEntrySize;
}
uint64_t XCOFFObjectFile::getSymbolSize(DataRefImpl Symb) const {
uint64_t Result = 0;
XCOFFSymbolRef XCOFFSym = toSymbolRef(Symb);
if (XCOFFSym.isCsectSymbol()) {
Expected<XCOFFCsectAuxRef> CsectAuxRefOrError =
XCOFFSym.getXCOFFCsectAuxRef();
if (!CsectAuxRefOrError)
// TODO: report the error up the stack.
consumeError(CsectAuxRefOrError.takeError());
else {
XCOFFCsectAuxRef CsectAuxRef = CsectAuxRefOrError.get();
uint8_t SymType = CsectAuxRef.getSymbolType();
if (SymType == XCOFF::XTY_SD || SymType == XCOFF::XTY_CM)
Result = CsectAuxRef.getSectionOrLength();
}
}
return Result;
}
uintptr_t XCOFFObjectFile::getSymbolEntryAddressByIndex(uint32_t Index) const {
return getAdvancedSymbolEntryAddress(
reinterpret_cast<uintptr_t>(getPointerToSymbolTable()), Index);
}
Expected<StringRef>
XCOFFObjectFile::getSymbolNameByIndex(uint32_t Index) const {
const uint32_t NumberOfSymTableEntries = getNumberOfSymbolTableEntries();
if (Index >= NumberOfSymTableEntries)
return createError("symbol index " + Twine(Index) +
" exceeds symbol count " +
Twine(NumberOfSymTableEntries));
DataRefImpl SymDRI;
SymDRI.p = getSymbolEntryAddressByIndex(Index);
return getSymbolName(SymDRI);
}
uint16_t XCOFFObjectFile::getFlags() const {
return is64Bit() ? fileHeader64()->Flags : fileHeader32()->Flags;
}
const char *XCOFFObjectFile::getSectionNameInternal(DataRefImpl Sec) const {
return is64Bit() ? toSection64(Sec)->Name : toSection32(Sec)->Name;
}
uintptr_t XCOFFObjectFile::getSectionHeaderTableAddress() const {
return reinterpret_cast<uintptr_t>(SectionHeaderTable);
}
int32_t XCOFFObjectFile::getSectionFlags(DataRefImpl Sec) const {
return is64Bit() ? toSection64(Sec)->Flags : toSection32(Sec)->Flags;
}
XCOFFObjectFile::XCOFFObjectFile(unsigned int Type, MemoryBufferRef Object)
: ObjectFile(Type, Object) {
assert(Type == Binary::ID_XCOFF32 || Type == Binary::ID_XCOFF64);
}
ArrayRef<XCOFFSectionHeader64> XCOFFObjectFile::sections64() const {
assert(is64Bit() && "64-bit interface called for non 64-bit file.");
const XCOFFSectionHeader64 *TablePtr = sectionHeaderTable64();
return ArrayRef<XCOFFSectionHeader64>(TablePtr,
TablePtr + getNumberOfSections());
}
ArrayRef<XCOFFSectionHeader32> XCOFFObjectFile::sections32() const {
assert(!is64Bit() && "32-bit interface called for non 32-bit file.");
const XCOFFSectionHeader32 *TablePtr = sectionHeaderTable32();
return ArrayRef<XCOFFSectionHeader32>(TablePtr,
TablePtr + getNumberOfSections());
}
// In an XCOFF32 file, when the field value is 65535, then an STYP_OVRFLO
// section header contains the actual count of relocation entries in the s_paddr
// field. STYP_OVRFLO headers contain the section index of their corresponding
// sections as their raw "NumberOfRelocations" field value.
template <typename T>
Expected<uint32_t> XCOFFObjectFile::getNumberOfRelocationEntries(
const XCOFFSectionHeader<T> &Sec) const {
const T &Section = static_cast<const T &>(Sec);
if (is64Bit())
return Section.NumberOfRelocations;
uint16_t SectionIndex = &Section - sectionHeaderTable<T>() + 1;
if (Section.NumberOfRelocations < XCOFF::RelocOverflow)
return Section.NumberOfRelocations;
for (const auto &Sec : sections32()) {