+ void WriteSymtabLoadCommand(uint32_t SymbolOffset, uint32_t NumSymbols,
+ uint32_t StringTableOffset,
+ uint32_t StringTableSize) {
+ // struct symtab_command (24 bytes)
+
+ uint64_t Start = OS.tell();
+ (void) Start;
+
+ Write32(LCT_Symtab);
+ Write32(SymtabLoadCommandSize);
+ Write32(SymbolOffset);
+ Write32(NumSymbols);
+ Write32(StringTableOffset);
+ Write32(StringTableSize);
+
+ assert(OS.tell() - Start == SymtabLoadCommandSize);
+ }
+
+ void WriteDysymtabLoadCommand(uint32_t FirstLocalSymbol,
+ uint32_t NumLocalSymbols,
+ uint32_t FirstExternalSymbol,
+ uint32_t NumExternalSymbols,
+ uint32_t FirstUndefinedSymbol,
+ uint32_t NumUndefinedSymbols,
+ uint32_t IndirectSymbolOffset,
+ uint32_t NumIndirectSymbols) {
+ // struct dysymtab_command (80 bytes)
+
+ uint64_t Start = OS.tell();
+ (void) Start;
+
+ Write32(LCT_Dysymtab);
+ Write32(DysymtabLoadCommandSize);
+ Write32(FirstLocalSymbol);
+ Write32(NumLocalSymbols);
+ Write32(FirstExternalSymbol);
+ Write32(NumExternalSymbols);
+ Write32(FirstUndefinedSymbol);
+ Write32(NumUndefinedSymbols);
+ Write32(0); // tocoff
+ Write32(0); // ntoc
+ Write32(0); // modtaboff
+ Write32(0); // nmodtab
+ Write32(0); // extrefsymoff
+ Write32(0); // nextrefsyms
+ Write32(IndirectSymbolOffset);
+ Write32(NumIndirectSymbols);
+ Write32(0); // extreloff
+ Write32(0); // nextrel
+ Write32(0); // locreloff
+ Write32(0); // nlocrel
+
+ assert(OS.tell() - Start == DysymtabLoadCommandSize);
+ }
+
+ void WriteNlist32(MachSymbolData &MSD) {
+ MCSymbolData &Data = *MSD.SymbolData;
+ const MCSymbol &Symbol = Data.getSymbol();
+ uint8_t Type = 0;
+ uint16_t Flags = Data.getFlags();
+ uint32_t Address = 0;
+
+ // Set the N_TYPE bits. See <mach-o/nlist.h>.
+ //
+ // FIXME: Are the prebound or indirect fields possible here?
+ if (Symbol.isUndefined())
+ Type = STT_Undefined;
+ else if (Symbol.isAbsolute())
+ Type = STT_Absolute;
+ else
+ Type = STT_Section;
+
+ // FIXME: Set STAB bits.
+
+ if (Data.isPrivateExtern())
+ Type |= STF_PrivateExtern;
+
+ // Set external bit.
+ if (Data.isExternal() || Symbol.isUndefined())
+ Type |= STF_External;
+
+ // Compute the symbol address.
+ if (Symbol.isDefined()) {
+ if (Symbol.isAbsolute()) {
+ llvm_unreachable("FIXME: Not yet implemented!");
+ } else {
+ Address = Data.getFragment()->getAddress() + Data.getOffset();
+ }
+ } else if (Data.isCommon()) {
+ // Common symbols are encoded with the size in the address
+ // field, and their alignment in the flags.
+ Address = Data.getCommonSize();
+
+ // Common alignment is packed into the 'desc' bits.
+ if (unsigned Align = Data.getCommonAlignment()) {
+ unsigned Log2Size = Log2_32(Align);
+ assert((1U << Log2Size) == Align && "Invalid 'common' alignment!");
+ if (Log2Size > 15)
+ llvm_report_error("invalid 'common' alignment '" +
+ Twine(Align) + "'");
+ // FIXME: Keep this mask with the SymbolFlags enumeration.
+ Flags = (Flags & 0xF0FF) | (Log2Size << 8);
+ }
+ }
+
+ // struct nlist (12 bytes)
+
+ Write32(MSD.StringIndex);
+ Write8(Type);
+ Write8(MSD.SectionIndex);
+
+ // The Mach-O streamer uses the lowest 16-bits of the flags for the 'desc'
+ // value.
+ Write16(Flags);
+ Write32(Address);
+ }
+
+ struct MachRelocationEntry {
+ uint32_t Word0;
+ uint32_t Word1;
+ };
+ void ComputeScatteredRelocationInfo(MCAssembler &Asm, MCFragment &Fragment,
+ MCAsmFixup &Fixup,
+ const MCValue &Target,
+ DenseMap<const MCSymbol*,MCSymbolData*> &SymbolMap,
+ std::vector<MachRelocationEntry> &Relocs) {
+ uint32_t Address = Fragment.getOffset() + Fixup.Offset;
+ unsigned IsPCRel = 0;
+ unsigned Log2Size = getFixupKindLog2Size(Fixup.Kind);
+ unsigned Type = RIT_Vanilla;
+
+ // See <reloc.h>.
+ const MCSymbol *A = Target.getSymA();
+ MCSymbolData *SD = SymbolMap.lookup(A);
+ uint32_t Value = SD->getFragment()->getAddress() + SD->getOffset();
+ uint32_t Value2 = 0;
+
+ if (const MCSymbol *B = Target.getSymB()) {
+ Type = RIT_LocalDifference;
+
+ MCSymbolData *SD = SymbolMap.lookup(B);
+ Value2 = SD->getFragment()->getAddress() + SD->getOffset();
+ }
+
+ // The value which goes in the fixup is current value of the expression.
+ Fixup.FixedValue = Value - Value2 + Target.getConstant();
+ if (isFixupKindPCRel(Fixup.Kind)) {
+ Fixup.FixedValue -= Address;
+ IsPCRel = 1;
+ }
+
+ MachRelocationEntry MRE;
+ MRE.Word0 = ((Address << 0) |
+ (Type << 24) |
+ (Log2Size << 28) |
+ (IsPCRel << 30) |
+ RF_Scattered);
+ MRE.Word1 = Value;
+ Relocs.push_back(MRE);
+
+ if (Type == RIT_LocalDifference) {
+ Type = RIT_Pair;
+
+ MachRelocationEntry MRE;
+ MRE.Word0 = ((0 << 0) |
+ (Type << 24) |
+ (Log2Size << 28) |
+ (0 << 30) |
+ RF_Scattered);
+ MRE.Word1 = Value2;
+ Relocs.push_back(MRE);
+ }
+ }
+
+ void ComputeRelocationInfo(MCAssembler &Asm, MCDataFragment &Fragment,
+ MCAsmFixup &Fixup,
+ DenseMap<const MCSymbol*,MCSymbolData*> &SymbolMap,
+ std::vector<MachRelocationEntry> &Relocs) {
+ MCValue Target;
+ if (!Fixup.Value->EvaluateAsRelocatable(Target))
+ llvm_report_error("expected relocatable expression");
+
+ // If this is a difference or a local symbol plus an offset, then we need a
+ // scattered relocation entry.
+ if (Target.getSymB() ||
+ (Target.getSymA() && !Target.getSymA()->isUndefined() &&
+ Target.getConstant()))
+ return ComputeScatteredRelocationInfo(Asm, Fragment, Fixup, Target,
+ SymbolMap, Relocs);
+
+ // See <reloc.h>.
+ uint32_t Address = Fragment.getOffset() + Fixup.Offset;
+ uint32_t Value = 0;
+ unsigned Index = 0;
+ unsigned IsPCRel = 0;
+ unsigned Log2Size = getFixupKindLog2Size(Fixup.Kind);
+ unsigned IsExtern = 0;
+ unsigned Type = 0;
+
+ if (Target.isAbsolute()) { // constant
+ // SymbolNum of 0 indicates the absolute section.
+ //
+ // FIXME: When is this generated?
+ Type = RIT_Vanilla;
+ Value = 0;
+ llvm_unreachable("FIXME: Not yet implemented!");
+ } else {
+ const MCSymbol *Symbol = Target.getSymA();
+ MCSymbolData *SD = SymbolMap.lookup(Symbol);
+
+ if (Symbol->isUndefined()) {
+ IsExtern = 1;
+ Index = SD->getIndex();
+ Value = 0;
+ } else {
+ // The index is the section ordinal.
+ //
+ // FIXME: O(N)
+ Index = 1;
+ MCAssembler::iterator it = Asm.begin(), ie = Asm.end();
+ for (; it != ie; ++it, ++Index)
+ if (&*it == SD->getFragment()->getParent())
+ break;
+ assert(it != ie && "Unable to find section index!");
+ Value = SD->getFragment()->getAddress() + SD->getOffset();
+ }
+
+ Type = RIT_Vanilla;
+ }
+
+ // The value which goes in the fixup is current value of the expression.
+ Fixup.FixedValue = Value + Target.getConstant();
+
+ if (isFixupKindPCRel(Fixup.Kind)) {
+ Fixup.FixedValue -= Address;
+ IsPCRel = 1;
+ }
+
+ // struct relocation_info (8 bytes)
+ MachRelocationEntry MRE;
+ MRE.Word0 = Address;
+ MRE.Word1 = ((Index << 0) |
+ (IsPCRel << 24) |
+ (Log2Size << 25) |
+ (IsExtern << 27) |
+ (Type << 28));
+ Relocs.push_back(MRE);
+ }
+
+ void BindIndirectSymbols(MCAssembler &Asm,
+ DenseMap<const MCSymbol*,MCSymbolData*> &SymbolMap) {
+ // This is the point where 'as' creates actual symbols for indirect symbols
+ // (in the following two passes). It would be easier for us to do this
+ // sooner when we see the attribute, but that makes getting the order in the
+ // symbol table much more complicated than it is worth.
+ //
+ // FIXME: Revisit this when the dust settles.
+
+ // Bind non lazy symbol pointers first.
+ for (MCAssembler::indirect_symbol_iterator it = Asm.indirect_symbol_begin(),
+ ie = Asm.indirect_symbol_end(); it != ie; ++it) {
+ // FIXME: cast<> support!
+ const MCSectionMachO &Section =
+ static_cast<const MCSectionMachO&>(it->SectionData->getSection());
+
+ unsigned Type =
+ Section.getTypeAndAttributes() & MCSectionMachO::SECTION_TYPE;
+ if (Type != MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS)
+ continue;
+
+ MCSymbolData *&Entry = SymbolMap[it->Symbol];
+ if (!Entry)
+ Entry = new MCSymbolData(*it->Symbol, 0, 0, &Asm);
+ }
+
+ // Then lazy symbol pointers and symbol stubs.
+ for (MCAssembler::indirect_symbol_iterator it = Asm.indirect_symbol_begin(),
+ ie = Asm.indirect_symbol_end(); it != ie; ++it) {
+ // FIXME: cast<> support!
+ const MCSectionMachO &Section =
+ static_cast<const MCSectionMachO&>(it->SectionData->getSection());
+
+ unsigned Type =
+ Section.getTypeAndAttributes() & MCSectionMachO::SECTION_TYPE;
+ if (Type != MCSectionMachO::S_LAZY_SYMBOL_POINTERS &&
+ Type != MCSectionMachO::S_SYMBOL_STUBS)
+ continue;
+
+ MCSymbolData *&Entry = SymbolMap[it->Symbol];
+ if (!Entry) {
+ Entry = new MCSymbolData(*it->Symbol, 0, 0, &Asm);
+
+ // Set the symbol type to undefined lazy, but only on construction.
+ //
+ // FIXME: Do not hardcode.
+ Entry->setFlags(Entry->getFlags() | 0x0001);
+ }
+ }
+ }
+
+ /// ComputeSymbolTable - Compute the symbol table data
+ ///
+ /// \param StringTable [out] - The string table data.
+ /// \param StringIndexMap [out] - Map from symbol names to offsets in the
+ /// string table.
+ void ComputeSymbolTable(MCAssembler &Asm, SmallString<256> &StringTable,
+ std::vector<MachSymbolData> &LocalSymbolData,
+ std::vector<MachSymbolData> &ExternalSymbolData,
+ std::vector<MachSymbolData> &UndefinedSymbolData) {
+ // Build section lookup table.
+ DenseMap<const MCSection*, uint8_t> SectionIndexMap;
+ unsigned Index = 1;
+ for (MCAssembler::iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it, ++Index)
+ SectionIndexMap[&it->getSection()] = Index;
+ assert(Index <= 256 && "Too many sections!");
+
+ // Index 0 is always the empty string.
+ StringMap<uint64_t> StringIndexMap;
+ StringTable += '\x00';
+
+ // Build the symbol arrays and the string table, but only for non-local
+ // symbols.
+ //
+ // The particular order that we collect the symbols and create the string
+ // table, then sort the symbols is chosen to match 'as'. Even though it
+ // doesn't matter for correctness, this is important for letting us diff .o
+ // files.
+ for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
+ ie = Asm.symbol_end(); it != ie; ++it) {
+ const MCSymbol &Symbol = it->getSymbol();
+
+ // Ignore assembler temporaries.
+ if (it->getSymbol().isTemporary())
+ continue;
+
+ if (!it->isExternal() && !Symbol.isUndefined())
+ continue;
+
+ uint64_t &Entry = StringIndexMap[Symbol.getName()];
+ if (!Entry) {
+ Entry = StringTable.size();
+ StringTable += Symbol.getName();
+ StringTable += '\x00';
+ }
+
+ MachSymbolData MSD;
+ MSD.SymbolData = it;
+ MSD.StringIndex = Entry;
+
+ if (Symbol.isUndefined()) {
+ MSD.SectionIndex = 0;
+ UndefinedSymbolData.push_back(MSD);
+ } else if (Symbol.isAbsolute()) {
+ MSD.SectionIndex = 0;
+ ExternalSymbolData.push_back(MSD);
+ } else {
+ MSD.SectionIndex = SectionIndexMap.lookup(&Symbol.getSection());
+ assert(MSD.SectionIndex && "Invalid section index!");
+ ExternalSymbolData.push_back(MSD);
+ }
+ }
+
+ // Now add the data for local symbols.
+ for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
+ ie = Asm.symbol_end(); it != ie; ++it) {
+ const MCSymbol &Symbol = it->getSymbol();
+
+ // Ignore assembler temporaries.
+ if (it->getSymbol().isTemporary())
+ continue;
+
+ if (it->isExternal() || Symbol.isUndefined())
+ continue;
+
+ uint64_t &Entry = StringIndexMap[Symbol.getName()];
+ if (!Entry) {
+ Entry = StringTable.size();
+ StringTable += Symbol.getName();
+ StringTable += '\x00';
+ }
+
+ MachSymbolData MSD;
+ MSD.SymbolData = it;
+ MSD.StringIndex = Entry;
+
+ if (Symbol.isAbsolute()) {
+ MSD.SectionIndex = 0;
+ LocalSymbolData.push_back(MSD);
+ } else {
+ MSD.SectionIndex = SectionIndexMap.lookup(&Symbol.getSection());
+ assert(MSD.SectionIndex && "Invalid section index!");
+ LocalSymbolData.push_back(MSD);
+ }
+ }
+
+ // External and undefined symbols are required to be in lexicographic order.
+ std::sort(ExternalSymbolData.begin(), ExternalSymbolData.end());
+ std::sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end());
+
+ // Set the symbol indices.
+ Index = 0;
+ for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i)
+ LocalSymbolData[i].SymbolData->setIndex(Index++);
+ for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i)
+ ExternalSymbolData[i].SymbolData->setIndex(Index++);
+ for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
+ UndefinedSymbolData[i].SymbolData->setIndex(Index++);
+
+ // The string table is padded to a multiple of 4.
+ while (StringTable.size() % 4)
+ StringTable += '\x00';
+ }
+
+ void WriteObject(MCAssembler &Asm) {
+ unsigned NumSections = Asm.size();
+
+ // Compute the symbol -> symbol data map.
+ //
+ // FIXME: This should not be here.
+ DenseMap<const MCSymbol*, MCSymbolData *> SymbolMap;
+ for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
+ ie = Asm.symbol_end(); it != ie; ++it)
+ SymbolMap[&it->getSymbol()] = it;
+
+ // Create symbol data for any indirect symbols.
+ BindIndirectSymbols(Asm, SymbolMap);
+
+ // Compute symbol table information.
+ SmallString<256> StringTable;
+ std::vector<MachSymbolData> LocalSymbolData;
+ std::vector<MachSymbolData> ExternalSymbolData;
+ std::vector<MachSymbolData> UndefinedSymbolData;
+ unsigned NumSymbols = Asm.symbol_size();
+
+ // No symbol table command is written if there are no symbols.
+ if (NumSymbols)
+ ComputeSymbolTable(Asm, StringTable, LocalSymbolData, ExternalSymbolData,
+ UndefinedSymbolData);
+
+ // The section data starts after the header, the segment load command (and
+ // section headers) and the symbol table.
+ unsigned NumLoadCommands = 1;
+ uint64_t LoadCommandsSize =
+ SegmentLoadCommand32Size + NumSections * Section32Size;
+
+ // Add the symbol table load command sizes, if used.
+ if (NumSymbols) {
+ NumLoadCommands += 2;
+ LoadCommandsSize += SymtabLoadCommandSize + DysymtabLoadCommandSize;
+ }
+
+ // Compute the total size of the section data, as well as its file size and
+ // vm size.
+ uint64_t SectionDataStart = Header32Size + LoadCommandsSize;
+ uint64_t SectionDataSize = 0;
+ uint64_t SectionDataFileSize = 0;
+ uint64_t VMSize = 0;
+ for (MCAssembler::iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it) {
+ MCSectionData &SD = *it;
+
+ VMSize = std::max(VMSize, SD.getAddress() + SD.getSize());
+
+ if (isVirtualSection(SD.getSection()))
+ continue;
+
+ SectionDataSize = std::max(SectionDataSize,
+ SD.getAddress() + SD.getSize());
+ SectionDataFileSize = std::max(SectionDataFileSize,
+ SD.getAddress() + SD.getFileSize());
+ }
+
+ // The section data is padded to 4 bytes.
+ //
+ // FIXME: Is this machine dependent?
+ unsigned SectionDataPadding = OffsetToAlignment(SectionDataFileSize, 4);
+ SectionDataFileSize += SectionDataPadding;
+
+ // Write the prolog, starting with the header and load command...
+ WriteHeader32(NumLoadCommands, LoadCommandsSize,
+ Asm.getSubsectionsViaSymbols());
+ WriteSegmentLoadCommand32(NumSections, VMSize,
+ SectionDataStart, SectionDataSize);
+
+ // ... and then the section headers.
+ //
+ // We also compute the section relocations while we do this. Note that
+ // computing relocation info will also update the fixup to have the correct
+ // value; this will overwrite the appropriate data in the fragment when it
+ // is written.
+ std::vector<MachRelocationEntry> RelocInfos;
+ uint64_t RelocTableEnd = SectionDataStart + SectionDataFileSize;
+ for (MCAssembler::iterator it = Asm.begin(),
+ ie = Asm.end(); it != ie; ++it) {
+ MCSectionData &SD = *it;
+
+ // The assembler writes relocations in the reverse order they were seen.
+ //
+ // FIXME: It is probably more complicated than this.
+ unsigned NumRelocsStart = RelocInfos.size();
+ for (MCSectionData::reverse_iterator it2 = SD.rbegin(),
+ ie2 = SD.rend(); it2 != ie2; ++it2)
+ if (MCDataFragment *DF = dyn_cast<MCDataFragment>(&*it2))
+ for (unsigned i = 0, e = DF->fixup_size(); i != e; ++i)
+ ComputeRelocationInfo(Asm, *DF, DF->getFixups()[e - i - 1],
+ SymbolMap, RelocInfos);
+
+ unsigned NumRelocs = RelocInfos.size() - NumRelocsStart;
+ uint64_t SectionStart = SectionDataStart + SD.getAddress();
+ WriteSection32(SD, SectionStart, RelocTableEnd, NumRelocs);
+ RelocTableEnd += NumRelocs * RelocationInfoSize;
+ }
+
+ // Write the symbol table load command, if used.
+ if (NumSymbols) {
+ unsigned FirstLocalSymbol = 0;
+ unsigned NumLocalSymbols = LocalSymbolData.size();
+ unsigned FirstExternalSymbol = FirstLocalSymbol + NumLocalSymbols;
+ unsigned NumExternalSymbols = ExternalSymbolData.size();
+ unsigned FirstUndefinedSymbol = FirstExternalSymbol + NumExternalSymbols;
+ unsigned NumUndefinedSymbols = UndefinedSymbolData.size();
+ unsigned NumIndirectSymbols = Asm.indirect_symbol_size();
+ unsigned NumSymTabSymbols =
+ NumLocalSymbols + NumExternalSymbols + NumUndefinedSymbols;
+ uint64_t IndirectSymbolSize = NumIndirectSymbols * 4;
+ uint64_t IndirectSymbolOffset = 0;
+
+ // If used, the indirect symbols are written after the section data.
+ if (NumIndirectSymbols)
+ IndirectSymbolOffset = RelocTableEnd;
+
+ // The symbol table is written after the indirect symbol data.
+ uint64_t SymbolTableOffset = RelocTableEnd + IndirectSymbolSize;
+
+ // The string table is written after symbol table.
+ uint64_t StringTableOffset =
+ SymbolTableOffset + NumSymTabSymbols * Nlist32Size;
+ WriteSymtabLoadCommand(SymbolTableOffset, NumSymTabSymbols,
+ StringTableOffset, StringTable.size());
+
+ WriteDysymtabLoadCommand(FirstLocalSymbol, NumLocalSymbols,
+ FirstExternalSymbol, NumExternalSymbols,
+ FirstUndefinedSymbol, NumUndefinedSymbols,
+ IndirectSymbolOffset, NumIndirectSymbols);
+ }
+
+ // Write the actual section data.
+ for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it)
+ WriteFileData(OS, *it, *this);
+
+ // Write the extra padding.
+ WriteZeros(SectionDataPadding);
+
+ // Write the relocation entries.
+ for (unsigned i = 0, e = RelocInfos.size(); i != e; ++i) {
+ Write32(RelocInfos[i].Word0);
+ Write32(RelocInfos[i].Word1);
+ }
+
+ // Write the symbol table data, if used.
+ if (NumSymbols) {
+ // Write the indirect symbol entries.
+ for (MCAssembler::indirect_symbol_iterator
+ it = Asm.indirect_symbol_begin(),
+ ie = Asm.indirect_symbol_end(); it != ie; ++it) {
+ // Indirect symbols in the non lazy symbol pointer section have some
+ // special handling.
+ const MCSectionMachO &Section =
+ static_cast<const MCSectionMachO&>(it->SectionData->getSection());
+ unsigned Type =
+ Section.getTypeAndAttributes() & MCSectionMachO::SECTION_TYPE;
+ if (Type == MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS) {
+ // If this symbol is defined and internal, mark it as such.
+ if (it->Symbol->isDefined() &&
+ !SymbolMap.lookup(it->Symbol)->isExternal()) {
+ uint32_t Flags = ISF_Local;
+ if (it->Symbol->isAbsolute())
+ Flags |= ISF_Absolute;
+ Write32(Flags);
+ continue;
+ }
+ }
+
+ Write32(SymbolMap[it->Symbol]->getIndex());
+ }
+
+ // FIXME: Check that offsets match computed ones.
+
+ // Write the symbol table entries.
+ for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i)
+ WriteNlist32(LocalSymbolData[i]);
+ for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i)
+ WriteNlist32(ExternalSymbolData[i]);
+ for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
+ WriteNlist32(UndefinedSymbolData[i]);
+
+ // Write the string table.
+ OS << StringTable.str();
+ }
+ }
+
+ void ApplyFixup(const MCAsmFixup &Fixup, MCDataFragment &DF) {
+ unsigned Size = 1 << getFixupKindLog2Size(Fixup.Kind);
+
+ // FIXME: Endianness assumption.
+ assert(Fixup.Offset + Size <= DF.getContents().size() &&
+ "Invalid fixup offset!");
+ for (unsigned i = 0; i != Size; ++i)
+ DF.getContents()[Fixup.Offset + i] = uint8_t(Fixup.FixedValue >> (i * 8));
+ }
+};