1 //===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements ELF object file writer information.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/MC/ELFObjectWriter.h"
15 #include "llvm/ADT/SmallPtrSet.h"
16 #include "llvm/ADT/STLExtras.h"
17 #include "llvm/ADT/StringMap.h"
18 #include "llvm/ADT/Twine.h"
19 #include "llvm/MC/MCAssembler.h"
20 #include "llvm/MC/MCAsmLayout.h"
21 #include "llvm/MC/MCContext.h"
22 #include "llvm/MC/MCELFSymbolFlags.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCObjectWriter.h"
25 #include "llvm/MC/MCSectionELF.h"
26 #include "llvm/MC/MCSymbol.h"
27 #include "llvm/MC/MCValue.h"
28 #include "llvm/Support/Debug.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/ELF.h"
31 #include "llvm/Target/TargetAsmBackend.h"
33 #include "../Target/X86/X86FixupKinds.h"
38 static unsigned GetType(const MCSymbolData &SD) {
39 uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift;
40 assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
41 Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
42 Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
43 Type == ELF::STT_TLS);
47 static unsigned GetBinding(const MCSymbolData &SD) {
48 uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift;
49 assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
50 Binding == ELF::STB_WEAK);
54 static void SetBinding(MCSymbolData &SD, unsigned Binding) {
55 assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
56 Binding == ELF::STB_WEAK);
57 uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift);
58 SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift));
61 static unsigned GetVisibility(MCSymbolData &SD) {
63 (SD.getFlags() & (0xf << ELF_STV_Shift)) >> ELF_STV_Shift;
64 assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
65 Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
69 static bool isFixupKindX86PCRel(unsigned Kind) {
73 case X86::reloc_pcrel_1byte:
74 case X86::reloc_pcrel_4byte:
75 case X86::reloc_riprel_4byte:
76 case X86::reloc_riprel_4byte_movq_load:
81 static bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) {
85 case MCSymbolRefExpr::VK_GOT:
86 case MCSymbolRefExpr::VK_PLT:
87 case MCSymbolRefExpr::VK_GOTPCREL:
88 case MCSymbolRefExpr::VK_TPOFF:
89 case MCSymbolRefExpr::VK_TLSGD:
90 case MCSymbolRefExpr::VK_GOTTPOFF:
91 case MCSymbolRefExpr::VK_INDNTPOFF:
92 case MCSymbolRefExpr::VK_NTPOFF:
93 case MCSymbolRefExpr::VK_GOTNTPOFF:
94 case MCSymbolRefExpr::VK_TLSLDM:
95 case MCSymbolRefExpr::VK_DTPOFF:
96 case MCSymbolRefExpr::VK_TLSLD:
103 class ELFObjectWriterImpl {
104 /*static bool isFixupKindX86RIPRel(unsigned Kind) {
105 return Kind == X86::reloc_riprel_4byte ||
106 Kind == X86::reloc_riprel_4byte_movq_load;
110 /// ELFSymbolData - Helper struct for containing some precomputed information
112 struct ELFSymbolData {
113 MCSymbolData *SymbolData;
114 uint64_t StringIndex;
115 uint32_t SectionIndex;
117 // Support lexicographic sorting.
118 bool operator<(const ELFSymbolData &RHS) const {
119 if (GetType(*SymbolData) == ELF::STT_FILE)
121 if (GetType(*RHS.SymbolData) == ELF::STT_FILE)
123 return SymbolData->getSymbol().getName() <
124 RHS.SymbolData->getSymbol().getName();
128 /// @name Relocation Data
131 struct ELFRelocationEntry {
132 // Make these big enough for both 32-bit and 64-bit
136 const MCSymbol *Symbol;
139 // Support lexicographic sorting.
140 bool operator<(const ELFRelocationEntry &RE) const {
141 return RE.r_offset < r_offset;
145 SmallPtrSet<const MCSymbol *, 16> UsedInReloc;
146 SmallPtrSet<const MCSymbol *, 16> WeakrefUsedInReloc;
147 DenseMap<const MCSymbol *, const MCSymbol *> Renames;
149 llvm::DenseMap<const MCSectionData*,
150 std::vector<ELFRelocationEntry> > Relocations;
151 DenseMap<const MCSection*, uint64_t> SectionStringTableIndex;
154 /// @name Symbol Table Data
157 SmallString<256> StringTable;
158 std::vector<ELFSymbolData> LocalSymbolData;
159 std::vector<ELFSymbolData> ExternalSymbolData;
160 std::vector<ELFSymbolData> UndefinedSymbolData;
164 int NumRegularSections;
168 bool NeedsSymtabShndx;
170 ELFObjectWriter *Writer;
174 unsigned Is64Bit : 1;
176 bool HasRelocationAddend;
178 Triple::OSType OSType;
182 // This holds the symbol table index of the last local symbol.
183 unsigned LastLocalSymbolIndex;
184 // This holds the .strtab section index.
185 unsigned StringTableIndex;
186 // This holds the .symtab section index.
187 unsigned SymbolTableIndex;
189 unsigned ShstrtabIndex;
192 ELFObjectWriterImpl(ELFObjectWriter *_Writer, bool _Is64Bit,
193 uint16_t _EMachine, bool _HasRelAddend,
194 Triple::OSType _OSType)
195 : NeedsGOT(false), NeedsSymtabShndx(false), Writer(_Writer),
196 OS(Writer->getStream()),
197 Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend),
198 OSType(_OSType), EMachine(_EMachine) {
201 void Write8(uint8_t Value) { Writer->Write8(Value); }
202 void Write16(uint16_t Value) { Writer->Write16(Value); }
203 void Write32(uint32_t Value) { Writer->Write32(Value); }
204 //void Write64(uint64_t Value) { Writer->Write64(Value); }
205 void WriteZeros(unsigned N) { Writer->WriteZeros(N); }
206 //void WriteBytes(StringRef Str, unsigned ZeroFillSize = 0) {
207 // Writer->WriteBytes(Str, ZeroFillSize);
210 void WriteWord(uint64_t W) {
217 void StringLE16(char *buf, uint16_t Value) {
218 buf[0] = char(Value >> 0);
219 buf[1] = char(Value >> 8);
222 void StringLE32(char *buf, uint32_t Value) {
223 StringLE16(buf, uint16_t(Value >> 0));
224 StringLE16(buf + 2, uint16_t(Value >> 16));
227 void StringLE64(char *buf, uint64_t Value) {
228 StringLE32(buf, uint32_t(Value >> 0));
229 StringLE32(buf + 4, uint32_t(Value >> 32));
232 void StringBE16(char *buf ,uint16_t Value) {
233 buf[0] = char(Value >> 8);
234 buf[1] = char(Value >> 0);
237 void StringBE32(char *buf, uint32_t Value) {
238 StringBE16(buf, uint16_t(Value >> 16));
239 StringBE16(buf + 2, uint16_t(Value >> 0));
242 void StringBE64(char *buf, uint64_t Value) {
243 StringBE32(buf, uint32_t(Value >> 32));
244 StringBE32(buf + 4, uint32_t(Value >> 0));
247 void String8(MCDataFragment &F, uint8_t Value) {
250 F.getContents() += StringRef(buf, 1);
253 void String16(MCDataFragment &F, uint16_t Value) {
255 if (Writer->isLittleEndian())
256 StringLE16(buf, Value);
258 StringBE16(buf, Value);
259 F.getContents() += StringRef(buf, 2);
262 void String32(MCDataFragment &F, uint32_t Value) {
264 if (Writer->isLittleEndian())
265 StringLE32(buf, Value);
267 StringBE32(buf, Value);
268 F.getContents() += StringRef(buf, 4);
271 void String64(MCDataFragment &F, uint64_t Value) {
273 if (Writer->isLittleEndian())
274 StringLE64(buf, Value);
276 StringBE64(buf, Value);
277 F.getContents() += StringRef(buf, 8);
280 void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections);
282 void WriteSymbolEntry(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
283 uint64_t name, uint8_t info,
284 uint64_t value, uint64_t size,
285 uint8_t other, uint32_t shndx,
288 void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
290 const MCAsmLayout &Layout);
292 typedef DenseMap<const MCSectionELF*, uint32_t> SectionIndexMapTy;
293 void WriteSymbolTable(MCDataFragment *SymtabF, MCDataFragment *ShndxF,
294 const MCAssembler &Asm,
295 const MCAsmLayout &Layout,
296 const SectionIndexMapTy &SectionIndexMap);
298 void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
299 const MCFragment *Fragment, const MCFixup &Fixup,
300 MCValue Target, uint64_t &FixedValue);
302 uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm,
305 /// ComputeSymbolTable - Compute the symbol table data
307 /// \param StringTable [out] - The string table data.
308 /// \param StringIndexMap [out] - Map from symbol names to offsets in the
310 void ComputeSymbolTable(MCAssembler &Asm,
311 const SectionIndexMapTy &SectionIndexMap);
313 void ComputeIndexMap(MCAssembler &Asm,
314 SectionIndexMapTy &SectionIndexMap);
316 void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout,
317 const MCSectionData &SD);
319 void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) {
320 for (MCAssembler::const_iterator it = Asm.begin(),
321 ie = Asm.end(); it != ie; ++it) {
322 WriteRelocation(Asm, Layout, *it);
326 void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout,
327 const SectionIndexMapTy &SectionIndexMap);
329 void ExecutePostLayoutBinding(MCAssembler &Asm);
331 void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags,
332 uint64_t Address, uint64_t Offset,
333 uint64_t Size, uint32_t Link, uint32_t Info,
334 uint64_t Alignment, uint64_t EntrySize);
336 void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F,
337 const MCSectionData *SD);
339 bool IsFixupFullyResolved(const MCAssembler &Asm,
340 const MCValue Target,
342 const MCFragment *DF) const;
344 void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout);
349 // Emit the ELF header.
350 void ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize,
351 unsigned NumberOfSections) {
357 // emitWord method behaves differently for ELF32 and ELF64, writing
358 // 4 bytes in the former and 8 in the latter.
360 Write8(0x7f); // e_ident[EI_MAG0]
361 Write8('E'); // e_ident[EI_MAG1]
362 Write8('L'); // e_ident[EI_MAG2]
363 Write8('F'); // e_ident[EI_MAG3]
365 Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS]
368 Write8(Writer->isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB);
370 Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION]
373 case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break;
374 case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break;
375 default: Write8(ELF::ELFOSABI_NONE); break;
377 Write8(0); // e_ident[EI_ABIVERSION]
379 WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD);
381 Write16(ELF::ET_REL); // e_type
383 Write16(EMachine); // e_machine = target
385 Write32(ELF::EV_CURRENT); // e_version
386 WriteWord(0); // e_entry, no entry point in .o file
387 WriteWord(0); // e_phoff, no program header for .o
388 WriteWord(SectionDataSize + (Is64Bit ? sizeof(ELF::Elf64_Ehdr) :
389 sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes
391 // FIXME: Make this configurable.
392 Write32(0); // e_flags = whatever the target wants
394 // e_ehsize = ELF header size
395 Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr));
397 Write16(0); // e_phentsize = prog header entry size
398 Write16(0); // e_phnum = # prog header entries = 0
400 // e_shentsize = Section header entry size
401 Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr));
403 // e_shnum = # of section header ents
404 if (NumberOfSections >= ELF::SHN_LORESERVE)
407 Write16(NumberOfSections);
409 // e_shstrndx = Section # of '.shstrtab'
410 if (NumberOfSections >= ELF::SHN_LORESERVE)
411 Write16(ELF::SHN_XINDEX);
413 Write16(ShstrtabIndex);
416 void ELFObjectWriterImpl::WriteSymbolEntry(MCDataFragment *SymtabF,
417 MCDataFragment *ShndxF,
419 uint8_t info, uint64_t value,
420 uint64_t size, uint8_t other,
424 if (shndx >= ELF::SHN_LORESERVE && !Reserved)
425 String32(*ShndxF, shndx);
427 String32(*ShndxF, 0);
430 uint16_t Index = (shndx >= ELF::SHN_LORESERVE && !Reserved) ?
431 uint16_t(ELF::SHN_XINDEX) : shndx;
434 String32(*SymtabF, name); // st_name
435 String8(*SymtabF, info); // st_info
436 String8(*SymtabF, other); // st_other
437 String16(*SymtabF, Index); // st_shndx
438 String64(*SymtabF, value); // st_value
439 String64(*SymtabF, size); // st_size
441 String32(*SymtabF, name); // st_name
442 String32(*SymtabF, value); // st_value
443 String32(*SymtabF, size); // st_size
444 String8(*SymtabF, info); // st_info
445 String8(*SymtabF, other); // st_other
446 String16(*SymtabF, Index); // st_shndx
450 static uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) {
451 if (Data.isCommon() && Data.isExternal())
452 return Data.getCommonAlignment();
454 const MCSymbol &Symbol = Data.getSymbol();
455 if (!Symbol.isInSection())
458 if (MCFragment *FF = Data.getFragment())
459 return Layout.getSymbolAddress(&Data) -
460 Layout.getSectionAddress(FF->getParent());
465 static const MCSymbol &AliasedSymbol(const MCSymbol &Symbol) {
466 const MCSymbol *S = &Symbol;
467 while (S->isVariable()) {
468 const MCExpr *Value = S->getVariableValue();
469 if (Value->getKind() != MCExpr::SymbolRef)
471 const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value);
472 S = &Ref->getSymbol();
477 void ELFObjectWriterImpl::ExecutePostLayoutBinding(MCAssembler &Asm) {
478 // The presence of symbol versions causes undefined symbols and
479 // versions declared with @@@ to be renamed.
481 for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
482 ie = Asm.symbol_end(); it != ie; ++it) {
483 const MCSymbol &Alias = it->getSymbol();
484 const MCSymbol &Symbol = AliasedSymbol(Alias);
485 MCSymbolData &SD = Asm.getSymbolData(Symbol);
487 // Undefined symbols are global, but this is the first place we
488 // are able to set it.
489 if (Symbol.isUndefined() && !Symbol.isVariable()) {
490 if (GetBinding(SD) == ELF::STB_LOCAL) {
491 SetBinding(SD, ELF::STB_GLOBAL);
492 SetBinding(*it, ELF::STB_GLOBAL);
497 if (&Symbol == &Alias)
500 StringRef AliasName = Alias.getName();
501 size_t Pos = AliasName.find('@');
502 if (Pos == StringRef::npos)
505 // Aliases defined with .symvar copy the binding from the symbol they alias.
506 // This is the first place we are able to copy this information.
507 it->setExternal(SD.isExternal());
508 SetBinding(*it, GetBinding(SD));
510 StringRef Rest = AliasName.substr(Pos);
511 if (!Symbol.isUndefined() && !Rest.startswith("@@@"))
514 // FIXME: produce a better error message.
515 if (Symbol.isUndefined() && Rest.startswith("@@") &&
516 !Rest.startswith("@@@"))
517 report_fatal_error("A @@ version cannot be undefined");
519 Renames.insert(std::make_pair(&Symbol, &Alias));
523 void ELFObjectWriterImpl::WriteSymbol(MCDataFragment *SymtabF,
524 MCDataFragment *ShndxF,
526 const MCAsmLayout &Layout) {
527 MCSymbolData &OrigData = *MSD.SymbolData;
529 Layout.getAssembler().getSymbolData(AliasedSymbol(OrigData.getSymbol()));
531 bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() ||
532 Data.getSymbol().isVariable();
534 uint8_t Binding = GetBinding(OrigData);
535 uint8_t Visibility = GetVisibility(OrigData);
536 uint8_t Type = GetType(Data);
538 uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift);
539 uint8_t Other = Visibility;
541 uint64_t Value = SymbolValue(Data, Layout);
545 assert(!(Data.isCommon() && !Data.isExternal()));
547 ESize = Data.getSize();
548 if (Data.getSize()) {
550 if (ESize->getKind() == MCExpr::Binary) {
551 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize);
553 if (BE->EvaluateAsRelocatable(Res, &Layout)) {
554 assert(!Res.getSymA() || !Res.getSymA()->getSymbol().isDefined());
555 assert(!Res.getSymB() || !Res.getSymB()->getSymbol().isDefined());
556 Size = Res.getConstant();
558 } else if (ESize->getKind() == MCExpr::Constant) {
559 Size = static_cast<const MCConstantExpr *>(ESize)->getValue();
561 assert(0 && "Unsupported size expression");
565 // Write out the symbol table entry
566 WriteSymbolEntry(SymtabF, ShndxF, MSD.StringIndex, Info, Value,
567 Size, Other, MSD.SectionIndex, IsReserved);
570 void ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *SymtabF,
571 MCDataFragment *ShndxF,
572 const MCAssembler &Asm,
573 const MCAsmLayout &Layout,
574 const SectionIndexMapTy &SectionIndexMap) {
575 // The string table must be emitted first because we need the index
576 // into the string table for all the symbol names.
577 assert(StringTable.size() && "Missing string table");
579 // FIXME: Make sure the start of the symbol table is aligned.
581 // The first entry is the undefined symbol entry.
582 WriteSymbolEntry(SymtabF, ShndxF, 0, 0, 0, 0, 0, 0, false);
584 // Write the symbol table entries.
585 LastLocalSymbolIndex = LocalSymbolData.size() + 1;
586 for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) {
587 ELFSymbolData &MSD = LocalSymbolData[i];
588 WriteSymbol(SymtabF, ShndxF, MSD, Layout);
591 // Write out a symbol table entry for each regular section.
592 for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e;
594 const MCSectionELF &Section =
595 static_cast<const MCSectionELF&>(i->getSection());
596 if (Section.getType() == ELF::SHT_RELA ||
597 Section.getType() == ELF::SHT_REL ||
598 Section.getType() == ELF::SHT_STRTAB ||
599 Section.getType() == ELF::SHT_SYMTAB)
601 WriteSymbolEntry(SymtabF, ShndxF, 0, ELF::STT_SECTION, 0, 0,
602 ELF::STV_DEFAULT, SectionIndexMap.lookup(&Section), false);
603 LastLocalSymbolIndex++;
606 for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) {
607 ELFSymbolData &MSD = ExternalSymbolData[i];
608 MCSymbolData &Data = *MSD.SymbolData;
609 assert(((Data.getFlags() & ELF_STB_Global) ||
610 (Data.getFlags() & ELF_STB_Weak)) &&
611 "External symbol requires STB_GLOBAL or STB_WEAK flag");
612 WriteSymbol(SymtabF, ShndxF, MSD, Layout);
613 if (GetBinding(Data) == ELF::STB_LOCAL)
614 LastLocalSymbolIndex++;
617 for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) {
618 ELFSymbolData &MSD = UndefinedSymbolData[i];
619 MCSymbolData &Data = *MSD.SymbolData;
620 WriteSymbol(SymtabF, ShndxF, MSD, Layout);
621 if (GetBinding(Data) == ELF::STB_LOCAL)
622 LastLocalSymbolIndex++;
626 static bool ShouldRelocOnSymbol(const MCSymbolData &SD,
627 const MCValue &Target,
628 const MCFragment &F) {
629 const MCSymbol &Symbol = SD.getSymbol();
630 if (Symbol.isUndefined())
633 const MCSectionELF &Section =
634 static_cast<const MCSectionELF&>(Symbol.getSection());
639 MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind();
640 const MCSectionELF &Sec2 =
641 static_cast<const MCSectionELF&>(F.getParent()->getSection());
643 if (Section.getKind().isBSS())
646 if (&Sec2 != &Section &&
647 (Kind == MCSymbolRefExpr::VK_PLT ||
648 Kind == MCSymbolRefExpr::VK_GOTPCREL ||
649 Kind == MCSymbolRefExpr::VK_GOTOFF))
652 if (Section.getFlags() & MCSectionELF::SHF_MERGE)
653 return Target.getConstant() != 0;
658 // FIXME: this is currently X86/X86_64 only
659 void ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm,
660 const MCAsmLayout &Layout,
661 const MCFragment *Fragment,
662 const MCFixup &Fixup,
664 uint64_t &FixedValue) {
667 int64_t Value = Target.getConstant();
668 const MCSymbol *Symbol = 0;
669 const MCSymbol *Renamed = 0;
671 bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind());
672 if (!Target.isAbsolute()) {
673 Symbol = &AliasedSymbol(Target.getSymA()->getSymbol());
674 Renamed = Renames.lookup(Symbol);
676 Renamed = &Target.getSymA()->getSymbol();
677 MCSymbolData &SD = Asm.getSymbolData(*Symbol);
678 MCFragment *F = SD.getFragment();
680 if (const MCSymbolRefExpr *RefB = Target.getSymB()) {
681 const MCSymbol &SymbolB = RefB->getSymbol();
682 MCSymbolData &SDB = Asm.getSymbolData(SymbolB);
684 MCSectionData *Sec = Fragment->getParent();
686 // Offset of the symbol in the section
687 int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec);
689 // Ofeset of the relocation in the section
690 int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
694 // Check that this case has already been fully resolved before we get
696 if (Symbol->isDefined() && !SD.isExternal() &&
698 &Fragment->getParent()->getSection() == &Symbol->getSection()) {
699 llvm_unreachable("We don't need a relocation in this case.");
703 bool RelocOnSymbol = ShouldRelocOnSymbol(SD, Target, *Fragment);
704 if (!RelocOnSymbol) {
705 Index = F->getParent()->getOrdinal();
707 MCSectionData *FSD = F->getParent();
708 // Offset of the symbol in the section
709 Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD);
711 UsedInReloc.insert(Renamed);
712 MCSymbolData &RenamedSD = Asm.getSymbolData(*Renamed);
713 if (RenamedSD.getFlags() & ELF_Other_Weakref) {
714 WeakrefUsedInReloc.insert(Symbol);
719 // Compensate for the addend on i386.
726 // determine the type of the relocation
728 MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind();
734 llvm_unreachable("Unimplemented");
735 case MCSymbolRefExpr::VK_None:
736 Type = ELF::R_X86_64_PC32;
738 case MCSymbolRefExpr::VK_PLT:
739 Type = ELF::R_X86_64_PLT32;
741 case MCSymbolRefExpr::VK_GOTPCREL:
742 Type = ELF::R_X86_64_GOTPCREL;
744 case MCSymbolRefExpr::VK_GOTTPOFF:
745 Type = ELF::R_X86_64_GOTTPOFF;
747 case MCSymbolRefExpr::VK_TLSGD:
748 Type = ELF::R_X86_64_TLSGD;
750 case MCSymbolRefExpr::VK_TLSLD:
751 Type = ELF::R_X86_64_TLSLD;
755 switch ((unsigned)Fixup.getKind()) {
756 default: llvm_unreachable("invalid fixup kind!");
757 case FK_Data_8: Type = ELF::R_X86_64_64; break;
758 case X86::reloc_signed_4byte:
759 case X86::reloc_pcrel_4byte:
760 assert(isInt<32>(Target.getConstant()));
763 llvm_unreachable("Unimplemented");
764 case MCSymbolRefExpr::VK_None:
765 Type = ELF::R_X86_64_32S;
767 case MCSymbolRefExpr::VK_GOT:
768 Type = ELF::R_X86_64_GOT32;
770 case MCSymbolRefExpr::VK_GOTPCREL:
771 Type = ELF::R_X86_64_GOTPCREL;
773 case MCSymbolRefExpr::VK_TPOFF:
774 Type = ELF::R_X86_64_TPOFF32;
776 case MCSymbolRefExpr::VK_DTPOFF:
777 Type = ELF::R_X86_64_DTPOFF32;
782 Type = ELF::R_X86_64_32;
784 case FK_Data_2: Type = ELF::R_X86_64_16; break;
785 case X86::reloc_pcrel_1byte:
786 case FK_Data_1: Type = ELF::R_X86_64_8; break;
793 llvm_unreachable("Unimplemented");
794 case MCSymbolRefExpr::VK_None:
795 Type = ELF::R_386_PC32;
797 case MCSymbolRefExpr::VK_PLT:
798 Type = ELF::R_386_PLT32;
802 switch ((unsigned)Fixup.getKind()) {
803 default: llvm_unreachable("invalid fixup kind!");
805 case X86::reloc_global_offset_table:
806 Type = ELF::R_386_GOTPC;
809 // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode
811 case X86::reloc_signed_4byte:
812 case X86::reloc_pcrel_4byte:
816 llvm_unreachable("Unimplemented");
817 case MCSymbolRefExpr::VK_None:
818 Type = ELF::R_386_32;
820 case MCSymbolRefExpr::VK_GOT:
821 Type = ELF::R_386_GOT32;
823 case MCSymbolRefExpr::VK_GOTOFF:
824 Type = ELF::R_386_GOTOFF;
826 case MCSymbolRefExpr::VK_TLSGD:
827 Type = ELF::R_386_TLS_GD;
829 case MCSymbolRefExpr::VK_TPOFF:
830 Type = ELF::R_386_TLS_LE_32;
832 case MCSymbolRefExpr::VK_INDNTPOFF:
833 Type = ELF::R_386_TLS_IE;
835 case MCSymbolRefExpr::VK_NTPOFF:
836 Type = ELF::R_386_TLS_LE;
838 case MCSymbolRefExpr::VK_GOTNTPOFF:
839 Type = ELF::R_386_TLS_GOTIE;
841 case MCSymbolRefExpr::VK_TLSLDM:
842 Type = ELF::R_386_TLS_LDM;
844 case MCSymbolRefExpr::VK_DTPOFF:
845 Type = ELF::R_386_TLS_LDO_32;
849 case FK_Data_2: Type = ELF::R_386_16; break;
850 case X86::reloc_pcrel_1byte:
851 case FK_Data_1: Type = ELF::R_386_8; break;
856 if (RelocNeedsGOT(Modifier))
859 ELFRelocationEntry ERE;
863 ERE.Symbol = Renamed;
865 ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
867 if (HasRelocationAddend)
868 ERE.r_addend = Addend;
870 ERE.r_addend = 0; // Silence compiler warning.
872 Relocations[Fragment->getParent()].push_back(ERE);
876 ELFObjectWriterImpl::getSymbolIndexInSymbolTable(const MCAssembler &Asm,
878 MCSymbolData &SD = Asm.getSymbolData(*S);
881 if (!SD.isExternal() && !S->isUndefined())
882 return SD.getIndex() + /* empty symbol */ 1;
884 // External or undefined symbol.
885 return SD.getIndex() + NumRegularSections + /* empty symbol */ 1;
888 static bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data,
889 bool Used, bool Renamed) {
890 if (Data.getFlags() & ELF_Other_Weakref)
899 const MCSymbol &Symbol = Data.getSymbol();
901 if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_")
904 const MCSymbol &A = AliasedSymbol(Symbol);
905 if (!A.isVariable() && A.isUndefined() && !Data.isCommon())
908 if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined())
911 if (Symbol.isTemporary())
917 static bool isLocal(const MCSymbolData &Data) {
918 if (Data.isExternal())
921 const MCSymbol &Symbol = Data.getSymbol();
922 if (Symbol.isUndefined() && !Symbol.isVariable())
928 void ELFObjectWriterImpl::ComputeIndexMap(MCAssembler &Asm,
929 SectionIndexMapTy &SectionIndexMap) {
931 for (MCAssembler::iterator it = Asm.begin(),
932 ie = Asm.end(); it != ie; ++it) {
933 const MCSectionELF &Section =
934 static_cast<const MCSectionELF &>(it->getSection());
935 SectionIndexMap[&Section] = Index++;
939 void ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm,
940 const SectionIndexMapTy &SectionIndexMap) {
941 // FIXME: Is this the correct place to do this?
943 llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_";
944 MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name);
945 MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym);
946 Data.setExternal(true);
947 SetBinding(Data, ELF::STB_GLOBAL);
950 // Build section lookup table.
951 NumRegularSections = Asm.size();
953 // Index 0 is always the empty string.
954 StringMap<uint64_t> StringIndexMap;
955 StringTable += '\x00';
957 // Add the data for the symbols.
958 for (MCAssembler::symbol_iterator it = Asm.symbol_begin(),
959 ie = Asm.symbol_end(); it != ie; ++it) {
960 const MCSymbol &Symbol = it->getSymbol();
962 bool Used = UsedInReloc.count(&Symbol);
963 bool WeakrefUsed = WeakrefUsedInReloc.count(&Symbol);
964 if (!isInSymtab(Asm, *it, Used || WeakrefUsed,
965 Renames.count(&Symbol)))
970 bool Local = isLocal(*it);
971 const MCSymbol &RefSymbol = AliasedSymbol(Symbol);
973 if (RefSymbol.isUndefined() && !Used && WeakrefUsed)
974 SetBinding(*it, ELF::STB_WEAK);
976 if (it->isCommon()) {
978 MSD.SectionIndex = ELF::SHN_COMMON;
979 } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) {
980 MSD.SectionIndex = ELF::SHN_ABS;
981 } else if (RefSymbol.isUndefined()) {
982 MSD.SectionIndex = ELF::SHN_UNDEF;
984 const MCSectionELF &Section =
985 static_cast<const MCSectionELF&>(RefSymbol.getSection());
986 MSD.SectionIndex = SectionIndexMap.lookup(&Section);
987 if (MSD.SectionIndex >= ELF::SHN_LORESERVE)
988 NeedsSymtabShndx = true;
989 assert(MSD.SectionIndex && "Invalid section index!");
992 // The @@@ in symbol version is replaced with @ in undefined symbols and
993 // @@ in defined ones.
994 StringRef Name = Symbol.getName();
995 size_t Pos = Name.find("@@@");
996 std::string FinalName;
997 if (Pos != StringRef::npos) {
998 StringRef Prefix = Name.substr(0, Pos);
999 unsigned n = MSD.SectionIndex == ELF::SHN_UNDEF ? 2 : 1;
1000 StringRef Suffix = Name.substr(Pos + n);
1001 FinalName = Prefix.str() + Suffix.str();
1003 FinalName = Name.str();
1006 uint64_t &Entry = StringIndexMap[FinalName];
1008 Entry = StringTable.size();
1009 StringTable += FinalName;
1010 StringTable += '\x00';
1012 MSD.StringIndex = Entry;
1013 if (MSD.SectionIndex == ELF::SHN_UNDEF)
1014 UndefinedSymbolData.push_back(MSD);
1016 LocalSymbolData.push_back(MSD);
1018 ExternalSymbolData.push_back(MSD);
1021 // Symbols are required to be in lexicographic order.
1022 array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end());
1023 array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end());
1024 array_pod_sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end());
1026 // Set the symbol indices. Local symbols must come before all other
1027 // symbols with non-local bindings.
1029 for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i)
1030 LocalSymbolData[i].SymbolData->setIndex(Index++);
1031 for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i)
1032 ExternalSymbolData[i].SymbolData->setIndex(Index++);
1033 for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
1034 UndefinedSymbolData[i].SymbolData->setIndex(Index++);
1037 void ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout,
1038 const MCSectionData &SD) {
1039 if (!Relocations[&SD].empty()) {
1040 MCContext &Ctx = Asm.getContext();
1041 const MCSectionELF *RelaSection;
1042 const MCSectionELF &Section =
1043 static_cast<const MCSectionELF&>(SD.getSection());
1045 const StringRef SectionName = Section.getSectionName();
1046 std::string RelaSectionName = HasRelocationAddend ? ".rela" : ".rel";
1047 RelaSectionName += SectionName;
1050 if (HasRelocationAddend)
1051 EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela);
1053 EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
1055 RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ?
1056 ELF::SHT_RELA : ELF::SHT_REL, 0,
1057 SectionKind::getReadOnly(),
1060 MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection);
1061 RelaSD.setAlignment(Is64Bit ? 8 : 4);
1063 MCDataFragment *F = new MCDataFragment(&RelaSD);
1065 WriteRelocationsFragment(Asm, F, &SD);
1067 Asm.AddSectionToTheEnd(*Writer, RelaSD, Layout);
1071 void ELFObjectWriterImpl::WriteSecHdrEntry(uint32_t Name, uint32_t Type,
1072 uint64_t Flags, uint64_t Address,
1073 uint64_t Offset, uint64_t Size,
1074 uint32_t Link, uint32_t Info,
1076 uint64_t EntrySize) {
1077 Write32(Name); // sh_name: index into string table
1078 Write32(Type); // sh_type
1079 WriteWord(Flags); // sh_flags
1080 WriteWord(Address); // sh_addr
1081 WriteWord(Offset); // sh_offset
1082 WriteWord(Size); // sh_size
1083 Write32(Link); // sh_link
1084 Write32(Info); // sh_info
1085 WriteWord(Alignment); // sh_addralign
1086 WriteWord(EntrySize); // sh_entsize
1089 void ELFObjectWriterImpl::WriteRelocationsFragment(const MCAssembler &Asm,
1091 const MCSectionData *SD) {
1092 std::vector<ELFRelocationEntry> &Relocs = Relocations[SD];
1093 // sort by the r_offset just like gnu as does
1094 array_pod_sort(Relocs.begin(), Relocs.end());
1096 for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
1097 ELFRelocationEntry entry = Relocs[e - i - 1];
1099 if (entry.Index < 0)
1100 entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol);
1102 entry.Index += LocalSymbolData.size() + 1;
1104 String64(*F, entry.r_offset);
1106 struct ELF::Elf64_Rela ERE64;
1107 ERE64.setSymbolAndType(entry.Index, entry.Type);
1108 String64(*F, ERE64.r_info);
1110 if (HasRelocationAddend)
1111 String64(*F, entry.r_addend);
1113 String32(*F, entry.r_offset);
1115 struct ELF::Elf32_Rela ERE32;
1116 ERE32.setSymbolAndType(entry.Index, entry.Type);
1117 String32(*F, ERE32.r_info);
1119 if (HasRelocationAddend)
1120 String32(*F, entry.r_addend);
1125 void ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm,
1126 MCAsmLayout &Layout,
1127 const SectionIndexMapTy &SectionIndexMap) {
1128 MCContext &Ctx = Asm.getContext();
1131 unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32;
1133 // We construct .shstrtab, .symtab and .strtab in this order to match gnu as.
1134 const MCSectionELF *ShstrtabSection =
1135 Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0,
1136 SectionKind::getReadOnly(), false);
1137 MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection);
1138 ShstrtabSD.setAlignment(1);
1139 ShstrtabIndex = Asm.size();
1141 const MCSectionELF *SymtabSection =
1142 Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0,
1143 SectionKind::getReadOnly(),
1145 MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection);
1146 SymtabSD.setAlignment(Is64Bit ? 8 : 4);
1147 SymbolTableIndex = Asm.size();
1149 MCSectionData *SymtabShndxSD = NULL;
1151 if (NeedsSymtabShndx) {
1152 const MCSectionELF *SymtabShndxSection =
1153 Ctx.getELFSection(".symtab_shndx", ELF::SHT_SYMTAB_SHNDX, 0,
1154 SectionKind::getReadOnly(), 4);
1155 SymtabShndxSD = &Asm.getOrCreateSectionData(*SymtabShndxSection);
1156 SymtabShndxSD->setAlignment(4);
1159 const MCSection *StrtabSection;
1160 StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0,
1161 SectionKind::getReadOnly(), false);
1162 MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection);
1163 StrtabSD.setAlignment(1);
1164 StringTableIndex = Asm.size();
1166 WriteRelocations(Asm, Layout);
1169 F = new MCDataFragment(&SymtabSD);
1170 MCDataFragment *ShndxF = NULL;
1171 if (NeedsSymtabShndx) {
1172 ShndxF = new MCDataFragment(SymtabShndxSD);
1173 Asm.AddSectionToTheEnd(*Writer, *SymtabShndxSD, Layout);
1175 WriteSymbolTable(F, ShndxF, Asm, Layout, SectionIndexMap);
1176 Asm.AddSectionToTheEnd(*Writer, SymtabSD, Layout);
1178 F = new MCDataFragment(&StrtabSD);
1179 F->getContents().append(StringTable.begin(), StringTable.end());
1180 Asm.AddSectionToTheEnd(*Writer, StrtabSD, Layout);
1182 F = new MCDataFragment(&ShstrtabSD);
1184 // Section header string table.
1186 // The first entry of a string table holds a null character so skip
1189 F->getContents() += '\x00';
1191 for (MCAssembler::const_iterator it = Asm.begin(),
1192 ie = Asm.end(); it != ie; ++it) {
1193 const MCSectionELF &Section =
1194 static_cast<const MCSectionELF&>(it->getSection());
1195 // FIXME: We could merge suffixes like in .text and .rela.text.
1197 // Remember the index into the string table so we can write it
1198 // into the sh_name field of the section header table.
1199 SectionStringTableIndex[&it->getSection()] = Index;
1201 Index += Section.getSectionName().size() + 1;
1202 F->getContents() += Section.getSectionName();
1203 F->getContents() += '\x00';
1206 Asm.AddSectionToTheEnd(*Writer, ShstrtabSD, Layout);
1209 bool ELFObjectWriterImpl::IsFixupFullyResolved(const MCAssembler &Asm,
1210 const MCValue Target,
1212 const MCFragment *DF) const {
1213 // If this is a PCrel relocation, find the section this fixup value is
1215 const MCSection *BaseSection = 0;
1217 BaseSection = &DF->getParent()->getSection();
1218 assert(BaseSection);
1221 const MCSection *SectionA = 0;
1222 const MCSymbol *SymbolA = 0;
1223 if (const MCSymbolRefExpr *A = Target.getSymA()) {
1224 SymbolA = &A->getSymbol();
1225 SectionA = &SymbolA->getSection();
1228 const MCSection *SectionB = 0;
1229 if (const MCSymbolRefExpr *B = Target.getSymB()) {
1230 SectionB = &B->getSymbol().getSection();
1234 return SectionA == SectionB;
1236 const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA);
1237 if (DataA.isExternal())
1240 return !SectionB && BaseSection == SectionA;
1243 void ELFObjectWriterImpl::WriteObject(MCAssembler &Asm,
1244 const MCAsmLayout &Layout) {
1245 SectionIndexMapTy SectionIndexMap;
1247 ComputeIndexMap(Asm, SectionIndexMap);
1249 // Compute symbol table information.
1250 ComputeSymbolTable(Asm, SectionIndexMap);
1252 CreateMetadataSections(const_cast<MCAssembler&>(Asm),
1253 const_cast<MCAsmLayout&>(Layout),
1256 // Add 1 for the null section.
1257 unsigned NumSections = Asm.size() + 1;
1258 uint64_t NaturalAlignment = Is64Bit ? 8 : 4;
1259 uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr);
1260 uint64_t FileOff = HeaderSize;
1262 for (MCAssembler::const_iterator it = Asm.begin(),
1263 ie = Asm.end(); it != ie; ++it) {
1264 const MCSectionData &SD = *it;
1266 FileOff = RoundUpToAlignment(FileOff, SD.getAlignment());
1268 // Get the size of the section in the output file (including padding).
1269 uint64_t Size = Layout.getSectionFileSize(&SD);
1274 FileOff = RoundUpToAlignment(FileOff, NaturalAlignment);
1276 // Write out the ELF header ...
1277 WriteHeader(FileOff - HeaderSize, NumSections);
1279 FileOff = HeaderSize;
1281 // ... then all of the sections ...
1282 DenseMap<const MCSection*, uint64_t> SectionOffsetMap;
1284 for (MCAssembler::const_iterator it = Asm.begin(),
1285 ie = Asm.end(); it != ie; ++it) {
1286 const MCSectionData &SD = *it;
1288 uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment());
1289 WriteZeros(Padding);
1292 // Remember the offset into the file for this section.
1293 SectionOffsetMap[&it->getSection()] = FileOff;
1295 FileOff += Layout.getSectionFileSize(&SD);
1297 Asm.WriteSectionData(it, Layout, Writer);
1300 uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment);
1301 WriteZeros(Padding);
1304 // ... and then the section header table.
1305 // Should we align the section header table?
1307 // Null section first.
1308 uint64_t FirstSectionSize =
1309 NumSections >= ELF::SHN_LORESERVE ? NumSections : 0;
1310 uint32_t FirstSectionLink =
1311 ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0;
1312 WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0);
1314 for (MCAssembler::const_iterator it = Asm.begin(),
1315 ie = Asm.end(); it != ie; ++it) {
1316 const MCSectionData &SD = *it;
1317 const MCSectionELF &Section =
1318 static_cast<const MCSectionELF&>(SD.getSection());
1320 uint64_t sh_link = 0;
1321 uint64_t sh_info = 0;
1323 switch(Section.getType()) {
1324 case ELF::SHT_DYNAMIC:
1325 sh_link = SectionStringTableIndex[&it->getSection()];
1330 case ELF::SHT_RELA: {
1331 const MCSectionELF *SymtabSection;
1332 const MCSectionELF *InfoSection;
1334 SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, 0,
1335 SectionKind::getReadOnly(),
1337 sh_link = SectionIndexMap[SymtabSection];
1339 // Remove ".rel" and ".rela" prefixes.
1340 unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5;
1341 StringRef SectionName = Section.getSectionName().substr(SecNameLen);
1343 InfoSection = Asm.getContext().getELFSection(SectionName,
1344 ELF::SHT_PROGBITS, 0,
1345 SectionKind::getReadOnly(),
1347 sh_info = SectionIndexMap[InfoSection];
1351 case ELF::SHT_SYMTAB:
1352 case ELF::SHT_DYNSYM:
1353 sh_link = StringTableIndex;
1354 sh_info = LastLocalSymbolIndex;
1357 case ELF::SHT_SYMTAB_SHNDX:
1358 sh_link = SymbolTableIndex;
1361 case ELF::SHT_PROGBITS:
1362 case ELF::SHT_STRTAB:
1363 case ELF::SHT_NOBITS:
1365 case ELF::SHT_ARM_ATTRIBUTES:
1370 assert(0 && "FIXME: sh_type value not supported!");
1374 WriteSecHdrEntry(SectionStringTableIndex[&it->getSection()],
1375 Section.getType(), Section.getFlags(),
1377 SectionOffsetMap.lookup(&SD.getSection()),
1378 Layout.getSectionSize(&SD), sh_link,
1379 sh_info, SD.getAlignment(),
1380 Section.getEntrySize());
1384 ELFObjectWriter::ELFObjectWriter(raw_ostream &OS,
1386 Triple::OSType OSType,
1388 bool IsLittleEndian,
1389 bool HasRelocationAddend)
1390 : MCObjectWriter(OS, IsLittleEndian)
1392 Impl = new ELFObjectWriterImpl(this, Is64Bit, EMachine,
1393 HasRelocationAddend, OSType);
1396 ELFObjectWriter::~ELFObjectWriter() {
1397 delete (ELFObjectWriterImpl*) Impl;
1400 void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) {
1401 ((ELFObjectWriterImpl*) Impl)->ExecutePostLayoutBinding(Asm);
1404 void ELFObjectWriter::RecordRelocation(const MCAssembler &Asm,
1405 const MCAsmLayout &Layout,
1406 const MCFragment *Fragment,
1407 const MCFixup &Fixup, MCValue Target,
1408 uint64_t &FixedValue) {
1409 ((ELFObjectWriterImpl*) Impl)->RecordRelocation(Asm, Layout, Fragment, Fixup,
1410 Target, FixedValue);
1413 bool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm,
1414 const MCValue Target,
1416 const MCFragment *DF) const {
1417 return ((ELFObjectWriterImpl*) Impl)->IsFixupFullyResolved(Asm, Target,
1421 void ELFObjectWriter::WriteObject(MCAssembler &Asm,
1422 const MCAsmLayout &Layout) {
1423 ((ELFObjectWriterImpl*) Impl)->WriteObject(Asm, Layout);