1 //===-- llvm/MC/WinCOFFObjectWriter.cpp -------------------------*- C++ -*-===//
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 contains an implementation of a Win32 COFF object file writer.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "WinCOFFObjectWriter"
16 #include "llvm/MC/MCObjectWriter.h"
17 #include "llvm/MC/MCSection.h"
18 #include "llvm/MC/MCContext.h"
19 #include "llvm/MC/MCSymbol.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCValue.h"
22 #include "llvm/MC/MCAssembler.h"
23 #include "llvm/MC/MCAsmLayout.h"
24 #include "llvm/MC/MCSectionCOFF.h"
26 #include "llvm/ADT/DenseMap.h"
27 #include "llvm/ADT/StringMap.h"
28 #include "llvm/ADT/StringRef.h"
30 #include "llvm/Support/COFF.h"
31 #include "llvm/Support/Debug.h"
32 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/System/TimeValue.h"
36 #include "../Target/X86/X86FixupKinds.h"
43 typedef llvm::SmallString<COFF::NameSize> name;
54 AuxiliaryType AuxType;
65 typedef llvm::SmallVector<AuxSymbol, 1> AuxiliarySymbols;
74 MCSymbolData const *MCData;
76 COFFSymbol(llvm::StringRef name);
78 void set_name_offset(uint32_t Offset);
80 bool should_keep() const;
83 // This class contains staging data for a COFF relocation entry.
84 struct COFFRelocation {
85 COFF::relocation Data;
88 COFFRelocation() : Symb(NULL) {}
89 static size_t size() { return COFF::RelocationSize; }
92 typedef std::vector<COFFRelocation> relocations;
100 MCSectionData const *MCData;
102 relocations Relocations;
104 COFFSection(llvm::StringRef name);
105 static size_t size();
108 // This class holds the COFF string table.
110 typedef llvm::StringMap<size_t> map;
113 void update_length();
115 std::vector<char> Data;
119 size_t insert(llvm::StringRef String);
122 class WinCOFFObjectWriter : public MCObjectWriter {
125 typedef std::vector<COFFSymbol*> symbols;
126 typedef std::vector<COFFSection*> sections;
128 typedef StringMap<COFFSymbol *> name_symbol_map;
129 typedef StringMap<COFFSection *> name_section_map;
131 typedef DenseMap<MCSymbolData const *, COFFSymbol *> symbol_map;
132 typedef DenseMap<MCSectionData const *, COFFSection *> section_map;
134 // Root level file contents.
141 // Maps used during object file creation.
142 section_map SectionMap;
143 symbol_map SymbolMap;
145 WinCOFFObjectWriter(raw_ostream &OS, bool is64Bit);
146 ~WinCOFFObjectWriter();
148 COFFSymbol *createSymbol(llvm::StringRef Name);
149 COFFSection *createSection(llvm::StringRef Name);
151 template <typename object_t, typename list_t>
152 object_t *createCOFFEntity(llvm::StringRef Name, list_t &List);
154 void DefineSection(MCSectionData const &SectionData);
155 void DefineSymbol(MCSymbolData const &SymbolData, MCAssembler &Assembler);
157 void MakeSymbolReal(COFFSymbol &S, size_t Index);
158 void MakeSectionReal(COFFSection &S, size_t Number);
160 bool ExportSection(COFFSection const *S);
161 bool ExportSymbol(MCSymbolData const &SymbolData, MCAssembler &Asm);
163 bool IsPhysicalSection(COFFSection *S);
165 // Entity writing methods.
167 void WriteFileHeader(const COFF::header &Header);
168 void WriteSymbol(const COFFSymbol *S);
169 void WriteAuxiliarySymbols(const COFFSymbol::AuxiliarySymbols &S);
170 void WriteSectionHeader(const COFF::section &S);
171 void WriteRelocation(const COFF::relocation &R);
173 // MCObjectWriter interface implementation.
175 void ExecutePostLayoutBinding(MCAssembler &Asm);
177 void RecordRelocation(const MCAssembler &Asm,
178 const MCAsmLayout &Layout,
179 const MCFragment *Fragment,
180 const MCFixup &Fixup,
182 uint64_t &FixedValue);
184 void WriteObject(const MCAssembler &Asm, const MCAsmLayout &Layout);
188 static inline void write_uint32_le(void *Data, uint32_t const &Value) {
189 uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
190 Ptr[0] = (Value & 0x000000FF) >> 0;
191 Ptr[1] = (Value & 0x0000FF00) >> 8;
192 Ptr[2] = (Value & 0x00FF0000) >> 16;
193 Ptr[3] = (Value & 0xFF000000) >> 24;
196 static inline void write_uint16_le(void *Data, uint16_t const &Value) {
197 uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
198 Ptr[0] = (Value & 0x00FF) >> 0;
199 Ptr[1] = (Value & 0xFF00) >> 8;
202 static inline void write_uint8_le(void *Data, uint8_t const &Value) {
203 uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
204 Ptr[0] = (Value & 0xFF) >> 0;
207 //------------------------------------------------------------------------------
208 // Symbol class implementation
210 COFFSymbol::COFFSymbol(llvm::StringRef name)
211 : Name(name.begin(), name.end())
216 memset(&Data, 0, sizeof(Data));
219 size_t COFFSymbol::size() const {
220 return COFF::SymbolSize + (Data.NumberOfAuxSymbols * COFF::SymbolSize);
223 // In the case that the name does not fit within 8 bytes, the offset
224 // into the string table is stored in the last 4 bytes instead, leaving
225 // the first 4 bytes as 0.
226 void COFFSymbol::set_name_offset(uint32_t Offset) {
227 write_uint32_le(Data.Name + 0, 0);
228 write_uint32_le(Data.Name + 4, Offset);
231 /// logic to decide if the symbol should be reported in the symbol table
232 bool COFFSymbol::should_keep() const {
233 // no section means its external, keep it
237 // if it has relocations pointing at it, keep it
238 if (Relocations > 0) {
239 assert(Section->Number != -1 && "Sections with relocations must be real!");
243 // if the section its in is being droped, drop it
244 if (Section->Number == -1)
247 // if it is the section symbol, keep it
248 if (Section->Symbol == this)
251 // if its temporary, drop it
252 if (MCData && MCData->getSymbol().isTemporary())
255 // otherwise, keep it
259 //------------------------------------------------------------------------------
260 // Section class implementation
262 COFFSection::COFFSection(llvm::StringRef name)
266 memset(&Header, 0, sizeof(Header));
269 size_t COFFSection::size() {
270 return COFF::SectionSize;
273 //------------------------------------------------------------------------------
274 // StringTable class implementation
276 /// Write the length of the string table into Data.
277 /// The length of the string table includes uint32 length header.
278 void StringTable::update_length() {
279 write_uint32_le(&Data.front(), Data.size());
282 StringTable::StringTable() {
283 // The string table data begins with the length of the entire string table
284 // including the length header. Allocate space for this header.
288 size_t StringTable::size() const {
292 /// Add String to the table iff it is not already there.
293 /// @returns the index into the string table where the string is now located.
294 size_t StringTable::insert(llvm::StringRef String) {
295 map::iterator i = Map.find(String);
300 size_t Offset = Data.size();
302 // Insert string data into string table.
303 Data.insert(Data.end(), String.begin(), String.end());
304 Data.push_back('\0');
306 // Put a reference to it in the map.
307 Map[String] = Offset;
309 // Update the internal length field.
315 //------------------------------------------------------------------------------
316 // WinCOFFObjectWriter class implementation
318 WinCOFFObjectWriter::WinCOFFObjectWriter(raw_ostream &OS, bool is64Bit)
319 : MCObjectWriter(OS, true)
321 memset(&Header, 0, sizeof(Header));
323 Is64Bit ? Header.Machine = COFF::IMAGE_FILE_MACHINE_AMD64
324 : Header.Machine = COFF::IMAGE_FILE_MACHINE_I386;
327 WinCOFFObjectWriter::~WinCOFFObjectWriter() {
328 for (symbols::iterator I = Symbols.begin(), E = Symbols.end(); I != E; ++I)
330 for (sections::iterator I = Sections.begin(), E = Sections.end(); I != E; ++I)
334 COFFSymbol *WinCOFFObjectWriter::createSymbol(llvm::StringRef Name) {
335 return createCOFFEntity<COFFSymbol>(Name, Symbols);
338 COFFSection *WinCOFFObjectWriter::createSection(llvm::StringRef Name) {
339 return createCOFFEntity<COFFSection>(Name, Sections);
342 /// A template used to lookup or create a symbol/section, and initialize it if
344 template <typename object_t, typename list_t>
345 object_t *WinCOFFObjectWriter::createCOFFEntity(llvm::StringRef Name,
347 object_t *Object = new object_t(Name);
349 List.push_back(Object);
354 /// This function takes a section data object from the assembler
355 /// and creates the associated COFF section staging object.
356 void WinCOFFObjectWriter::DefineSection(MCSectionData const &SectionData) {
357 // FIXME: Not sure how to verify this (at least in a debug build).
358 MCSectionCOFF const &Sec =
359 static_cast<MCSectionCOFF const &>(SectionData.getSection());
361 COFFSection *coff_section = createSection(Sec.getSectionName());
362 COFFSymbol *coff_symbol = createSymbol(Sec.getSectionName());
364 coff_section->Symbol = coff_symbol;
365 coff_symbol->Section = coff_section;
366 coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_STATIC;
368 // In this case the auxiliary symbol is a Section Definition.
369 coff_symbol->Aux.resize(1);
370 memset(&coff_symbol->Aux[0], 0, sizeof(coff_symbol->Aux[0]));
371 coff_symbol->Aux[0].AuxType = ATSectionDefinition;
372 coff_symbol->Aux[0].Aux.SectionDefinition.Selection = Sec.getSelection();
374 coff_section->Header.Characteristics = Sec.getCharacteristics();
376 uint32_t &Characteristics = coff_section->Header.Characteristics;
377 switch (SectionData.getAlignment()) {
378 case 1: Characteristics |= COFF::IMAGE_SCN_ALIGN_1BYTES; break;
379 case 2: Characteristics |= COFF::IMAGE_SCN_ALIGN_2BYTES; break;
380 case 4: Characteristics |= COFF::IMAGE_SCN_ALIGN_4BYTES; break;
381 case 8: Characteristics |= COFF::IMAGE_SCN_ALIGN_8BYTES; break;
382 case 16: Characteristics |= COFF::IMAGE_SCN_ALIGN_16BYTES; break;
383 case 32: Characteristics |= COFF::IMAGE_SCN_ALIGN_32BYTES; break;
384 case 64: Characteristics |= COFF::IMAGE_SCN_ALIGN_64BYTES; break;
385 case 128: Characteristics |= COFF::IMAGE_SCN_ALIGN_128BYTES; break;
386 case 256: Characteristics |= COFF::IMAGE_SCN_ALIGN_256BYTES; break;
387 case 512: Characteristics |= COFF::IMAGE_SCN_ALIGN_512BYTES; break;
388 case 1024: Characteristics |= COFF::IMAGE_SCN_ALIGN_1024BYTES; break;
389 case 2048: Characteristics |= COFF::IMAGE_SCN_ALIGN_2048BYTES; break;
390 case 4096: Characteristics |= COFF::IMAGE_SCN_ALIGN_4096BYTES; break;
391 case 8192: Characteristics |= COFF::IMAGE_SCN_ALIGN_8192BYTES; break;
393 llvm_unreachable("unsupported section alignment");
396 // Bind internal COFF section to MC section.
397 coff_section->MCData = &SectionData;
398 SectionMap[&SectionData] = coff_section;
401 /// This function takes a section data object from the assembler
402 /// and creates the associated COFF symbol staging object.
403 void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
404 MCAssembler &Assembler) {
405 assert(!SymbolData.getSymbol().isVariable()
406 && "Cannot define a symbol that is a variable!");
407 COFFSymbol *coff_symbol = createSymbol(SymbolData.getSymbol().getName());
409 coff_symbol->Data.Type = (SymbolData.getFlags() & 0x0000FFFF) >> 0;
410 coff_symbol->Data.StorageClass = (SymbolData.getFlags() & 0x00FF0000) >> 16;
412 // If no storage class was specified in the streamer, define it here.
413 if (coff_symbol->Data.StorageClass == 0) {
414 bool external = SymbolData.isExternal() || (SymbolData.Fragment == NULL);
416 coff_symbol->Data.StorageClass =
417 external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_LABEL;
420 if (SymbolData.getFlags() & COFF::SF_WeakReference) {
421 coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
423 const MCExpr *Value = SymbolData.getSymbol().getVariableValue();
425 // FIXME: This assert message isn't very good.
426 assert(Value->getKind() == MCExpr::SymbolRef &&
427 "Value must be a SymbolRef!");
429 const MCSymbolRefExpr *SymbolRef =
430 static_cast<const MCSymbolRefExpr *>(Value);
432 const MCSymbolData &OtherSymbolData =
433 Assembler.getSymbolData(SymbolRef->getSymbol());
435 // FIXME: This assert message isn't very good.
436 assert(SymbolMap.find(&OtherSymbolData) != SymbolMap.end() &&
437 "OtherSymbolData must be in the symbol map!");
439 coff_symbol->Other = SymbolMap[&OtherSymbolData];
441 // Setup the Weak External auxiliary symbol.
442 coff_symbol->Aux.resize(1);
443 memset(&coff_symbol->Aux[0], 0, sizeof(coff_symbol->Aux[0]));
444 coff_symbol->Aux[0].AuxType = ATWeakExternal;
445 coff_symbol->Aux[0].Aux.WeakExternal.TagIndex = 0;
446 coff_symbol->Aux[0].Aux.WeakExternal.Characteristics =
447 COFF::IMAGE_WEAK_EXTERN_SEARCH_LIBRARY;
450 if (SymbolData.Fragment != NULL)
451 coff_symbol->Section = SectionMap[SymbolData.Fragment->getParent()];
453 // Bind internal COFF symbol to MC symbol.
454 coff_symbol->MCData = &SymbolData;
455 SymbolMap[&SymbolData] = coff_symbol;
458 /// making a section real involves assigned it a number and putting
459 /// name into the string table if needed
460 void WinCOFFObjectWriter::MakeSectionReal(COFFSection &S, size_t Number) {
461 if (S.Name.size() > COFF::NameSize) {
462 size_t StringTableEntry = Strings.insert(S.Name.c_str());
464 // FIXME: Why is this number 999999? This number is never mentioned in the
465 // spec. I'm assuming this is due to the printed value needing to fit into
466 // the S.Header.Name field. In which case why not 9999999 (7 9's instead of
467 // 6)? The spec does not state if this entry should be null terminated in
468 // this case, and thus this seems to be the best way to do it. I think I
469 // just solved my own FIXME...
470 if (StringTableEntry > 999999)
471 report_fatal_error("COFF string table is greater than 999999 bytes.");
473 std::sprintf(S.Header.Name, "/%d", unsigned(StringTableEntry));
475 std::memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
478 S.Symbol->Data.SectionNumber = S.Number;
479 S.Symbol->Aux[0].Aux.SectionDefinition.Number = S.Number;
482 void WinCOFFObjectWriter::MakeSymbolReal(COFFSymbol &S, size_t Index) {
483 if (S.Name.size() > COFF::NameSize) {
484 size_t StringTableEntry = Strings.insert(S.Name.c_str());
486 S.set_name_offset(StringTableEntry);
488 std::memcpy(S.Data.Name, S.Name.c_str(), S.Name.size());
492 bool WinCOFFObjectWriter::ExportSection(COFFSection const *S) {
493 return !S->MCData->getFragmentList().empty();
496 bool WinCOFFObjectWriter::ExportSymbol(MCSymbolData const &SymbolData,
498 // This doesn't seem to be right. Strings referred to from the .data section
499 // need symbols so they can be linked to code in the .text section right?
501 // return Asm.isSymbolLinkerVisible (&SymbolData);
503 // For now, all non-variable symbols are exported,
504 // the linker will sort the rest out for us.
505 return !SymbolData.getSymbol().isVariable();
508 bool WinCOFFObjectWriter::IsPhysicalSection(COFFSection *S) {
509 return (S->Header.Characteristics
510 & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0;
513 //------------------------------------------------------------------------------
514 // entity writing methods
516 void WinCOFFObjectWriter::WriteFileHeader(const COFF::header &Header) {
517 WriteLE16(Header.Machine);
518 WriteLE16(Header.NumberOfSections);
519 WriteLE32(Header.TimeDateStamp);
520 WriteLE32(Header.PointerToSymbolTable);
521 WriteLE32(Header.NumberOfSymbols);
522 WriteLE16(Header.SizeOfOptionalHeader);
523 WriteLE16(Header.Characteristics);
526 void WinCOFFObjectWriter::WriteSymbol(const COFFSymbol *S) {
527 WriteBytes(StringRef(S->Data.Name, COFF::NameSize));
528 WriteLE32(S->Data.Value);
529 WriteLE16(S->Data.SectionNumber);
530 WriteLE16(S->Data.Type);
531 Write8(S->Data.StorageClass);
532 Write8(S->Data.NumberOfAuxSymbols);
533 WriteAuxiliarySymbols(S->Aux);
536 void WinCOFFObjectWriter::WriteAuxiliarySymbols(
537 const COFFSymbol::AuxiliarySymbols &S) {
538 for(COFFSymbol::AuxiliarySymbols::const_iterator i = S.begin(), e = S.end();
541 case ATFunctionDefinition:
542 WriteLE32(i->Aux.FunctionDefinition.TagIndex);
543 WriteLE32(i->Aux.FunctionDefinition.TotalSize);
544 WriteLE32(i->Aux.FunctionDefinition.PointerToLinenumber);
545 WriteLE32(i->Aux.FunctionDefinition.PointerToNextFunction);
546 WriteZeros(sizeof(i->Aux.FunctionDefinition.unused));
548 case ATbfAndefSymbol:
549 WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused1));
550 WriteLE16(i->Aux.bfAndefSymbol.Linenumber);
551 WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused2));
552 WriteLE32(i->Aux.bfAndefSymbol.PointerToNextFunction);
553 WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused3));
556 WriteLE32(i->Aux.WeakExternal.TagIndex);
557 WriteLE32(i->Aux.WeakExternal.Characteristics);
558 WriteZeros(sizeof(i->Aux.WeakExternal.unused));
561 WriteBytes(StringRef(reinterpret_cast<const char *>(i->Aux.File.FileName),
562 sizeof(i->Aux.File.FileName)));
564 case ATSectionDefinition:
565 WriteLE32(i->Aux.SectionDefinition.Length);
566 WriteLE16(i->Aux.SectionDefinition.NumberOfRelocations);
567 WriteLE16(i->Aux.SectionDefinition.NumberOfLinenumbers);
568 WriteLE32(i->Aux.SectionDefinition.CheckSum);
569 WriteLE16(i->Aux.SectionDefinition.Number);
570 Write8(i->Aux.SectionDefinition.Selection);
571 WriteZeros(sizeof(i->Aux.SectionDefinition.unused));
577 void WinCOFFObjectWriter::WriteSectionHeader(const COFF::section &S) {
578 WriteBytes(StringRef(S.Name, COFF::NameSize));
580 WriteLE32(S.VirtualSize);
581 WriteLE32(S.VirtualAddress);
582 WriteLE32(S.SizeOfRawData);
583 WriteLE32(S.PointerToRawData);
584 WriteLE32(S.PointerToRelocations);
585 WriteLE32(S.PointerToLineNumbers);
586 WriteLE16(S.NumberOfRelocations);
587 WriteLE16(S.NumberOfLineNumbers);
588 WriteLE32(S.Characteristics);
591 void WinCOFFObjectWriter::WriteRelocation(const COFF::relocation &R) {
592 WriteLE32(R.VirtualAddress);
593 WriteLE32(R.SymbolTableIndex);
597 ////////////////////////////////////////////////////////////////////////////////
598 // MCObjectWriter interface implementations
600 void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) {
601 // "Define" each section & symbol. This creates section & symbol
602 // entries in the staging area.
604 for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; i++)
607 for (MCAssembler::const_symbol_iterator i = Asm.symbol_begin(),
608 e = Asm.symbol_end(); i != e; i++) {
609 if (ExportSymbol(*i, Asm))
610 DefineSymbol(*i, Asm);
614 void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
615 const MCAsmLayout &Layout,
616 const MCFragment *Fragment,
617 const MCFixup &Fixup,
619 uint64_t &FixedValue) {
620 assert(Target.getSymA() != NULL && "Relocation must reference a symbol!");
622 const MCSymbol *A = &Target.getSymA()->getSymbol();
623 MCSymbolData &A_SD = Asm.getSymbolData(*A);
625 MCSectionData const *SectionData = Fragment->getParent();
627 // Mark this symbol as requiring an entry in the symbol table.
628 assert(SectionMap.find(SectionData) != SectionMap.end() &&
629 "Section must already have been defined in ExecutePostLayoutBinding!");
630 assert(SymbolMap.find(&A_SD) != SymbolMap.end() &&
631 "Symbol must already have been defined in ExecutePostLayoutBinding!");
633 COFFSection *coff_section = SectionMap[SectionData];
634 COFFSymbol *coff_symbol = SymbolMap[&A_SD];
636 if (Target.getSymB()) {
637 const MCSymbol *B = &Target.getSymB()->getSymbol();
638 MCSymbolData &B_SD = Asm.getSymbolData(*B);
640 FixedValue = Layout.getSymbolAddress(&A_SD) - Layout.getSymbolAddress(&B_SD);
642 // In the case where we have SymbA and SymB, we just need to store the delta
643 // between the two symbols. Update FixedValue to account for the delta, and
644 // skip recording the relocation.
647 FixedValue = Target.getConstant();
650 COFFRelocation Reloc;
652 Reloc.Data.SymbolTableIndex = 0;
653 Reloc.Data.VirtualAddress = Layout.getFragmentOffset(Fragment);
655 // turn relocations for temporary symbols into section relocations
656 if (coff_symbol->MCData->getSymbol().isTemporary()) {
657 Reloc.Symb = coff_symbol->Section->Symbol;
658 FixedValue += Layout.getFragmentOffset(coff_symbol->MCData->Fragment);
660 Reloc.Symb = coff_symbol;
662 ++Reloc.Symb->Relocations;
664 Reloc.Data.VirtualAddress += Fixup.getOffset();
666 switch (Fixup.getKind()) {
667 case X86::reloc_pcrel_4byte:
668 case X86::reloc_riprel_4byte:
669 case X86::reloc_riprel_4byte_movq_load:
670 Reloc.Data.Type = Is64Bit ? COFF::IMAGE_REL_AMD64_REL32
671 : COFF::IMAGE_REL_I386_REL32;
672 // FIXME: Can anyone explain what this does other than adjust for the size
677 Reloc.Data.Type = Is64Bit ? COFF::IMAGE_REL_AMD64_ADDR32
678 : COFF::IMAGE_REL_I386_DIR32;
682 Reloc.Data.Type = COFF::IMAGE_REL_AMD64_ADDR64;
684 llvm_unreachable("unsupported relocation type");
687 llvm_unreachable("unsupported relocation type");
690 coff_section->Relocations.push_back(Reloc);
693 void WinCOFFObjectWriter::WriteObject(const MCAssembler &Asm,
694 const MCAsmLayout &Layout) {
695 // Assign symbol and section indexes and offsets.
696 Header.NumberOfSections = 0;
698 for (sections::iterator i = Sections.begin(),
699 e = Sections.end(); i != e; i++) {
700 if (Layout.getSectionSize((*i)->MCData) > 0) {
701 MakeSectionReal(**i, ++Header.NumberOfSections);
707 Header.NumberOfSymbols = 0;
709 for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
710 COFFSymbol *coff_symbol = *i;
711 MCSymbolData const *SymbolData = coff_symbol->MCData;
713 // Update section number & offset for symbols that have them.
714 if ((SymbolData != NULL) && (SymbolData->Fragment != NULL)) {
715 assert(coff_symbol->Section != NULL);
717 coff_symbol->Data.SectionNumber = coff_symbol->Section->Number;
718 coff_symbol->Data.Value = Layout.getFragmentOffset(SymbolData->Fragment)
719 + SymbolData->Offset;
722 if (coff_symbol->should_keep()) {
723 MakeSymbolReal(*coff_symbol, Header.NumberOfSymbols++);
725 // Update auxiliary symbol info.
726 coff_symbol->Data.NumberOfAuxSymbols = coff_symbol->Aux.size();
727 Header.NumberOfSymbols += coff_symbol->Data.NumberOfAuxSymbols;
729 coff_symbol->Index = -1;
732 // Fixup weak external references.
733 for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
734 COFFSymbol *coff_symbol = *i;
735 if (coff_symbol->Other != NULL) {
736 assert(coff_symbol->Index != -1);
737 assert(coff_symbol->Aux.size() == 1 &&
738 "Symbol must contain one aux symbol!");
739 assert(coff_symbol->Aux[0].AuxType == ATWeakExternal &&
740 "Symbol's aux symbol must be a Weak External!");
741 coff_symbol->Aux[0].Aux.WeakExternal.TagIndex = coff_symbol->Other->Index;
745 // Assign file offsets to COFF object file structures.
749 offset += COFF::HeaderSize;
750 offset += COFF::SectionSize * Header.NumberOfSections;
752 for (MCAssembler::const_iterator i = Asm.begin(),
755 COFFSection *Sec = SectionMap[i];
757 if (Sec->Number == -1)
760 Sec->Header.SizeOfRawData = Layout.getSectionFileSize(i);
762 if (IsPhysicalSection(Sec)) {
763 Sec->Header.PointerToRawData = offset;
765 offset += Sec->Header.SizeOfRawData;
768 if (Sec->Relocations.size() > 0) {
769 Sec->Header.NumberOfRelocations = Sec->Relocations.size();
770 Sec->Header.PointerToRelocations = offset;
772 offset += COFF::RelocationSize * Sec->Relocations.size();
774 for (relocations::iterator cr = Sec->Relocations.begin(),
775 er = Sec->Relocations.end();
777 assert((*cr).Symb->Index != -1);
778 (*cr).Data.SymbolTableIndex = (*cr).Symb->Index;
782 assert(Sec->Symbol->Aux.size() == 1
783 && "Section's symbol must have one aux!");
784 AuxSymbol &Aux = Sec->Symbol->Aux[0];
785 assert(Aux.AuxType == ATSectionDefinition &&
786 "Section's symbol's aux symbol must be a Section Definition!");
787 Aux.Aux.SectionDefinition.Length = Sec->Header.SizeOfRawData;
788 Aux.Aux.SectionDefinition.NumberOfRelocations =
789 Sec->Header.NumberOfRelocations;
790 Aux.Aux.SectionDefinition.NumberOfLinenumbers =
791 Sec->Header.NumberOfLineNumbers;
794 Header.PointerToSymbolTable = offset;
796 Header.TimeDateStamp = sys::TimeValue::now().toEpochTime();
798 // Write it all to disk...
799 WriteFileHeader(Header);
802 sections::iterator i, ie;
803 MCAssembler::const_iterator j, je;
805 for (i = Sections.begin(), ie = Sections.end(); i != ie; i++)
806 if ((*i)->Number != -1)
807 WriteSectionHeader((*i)->Header);
809 for (i = Sections.begin(), ie = Sections.end(),
810 j = Asm.begin(), je = Asm.end();
811 (i != ie) && (j != je); ++i, ++j) {
813 if ((*i)->Number == -1)
816 if ((*i)->Header.PointerToRawData != 0) {
817 assert(OS.tell() == (*i)->Header.PointerToRawData &&
818 "Section::PointerToRawData is insane!");
820 Asm.WriteSectionData(j, Layout, this);
823 if ((*i)->Relocations.size() > 0) {
824 assert(OS.tell() == (*i)->Header.PointerToRelocations &&
825 "Section::PointerToRelocations is insane!");
827 for (relocations::const_iterator k = (*i)->Relocations.begin(),
828 ke = (*i)->Relocations.end();
830 WriteRelocation(k->Data);
833 assert((*i)->Header.PointerToRelocations == 0 &&
834 "Section::PointerToRelocations is insane!");
838 assert(OS.tell() == Header.PointerToSymbolTable &&
839 "Header::PointerToSymbolTable is insane!");
841 for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++)
842 if ((*i)->Index != -1)
845 OS.write((char const *)&Strings.Data.front(), Strings.Data.size());
848 //------------------------------------------------------------------------------
849 // WinCOFFObjectWriter factory function
852 MCObjectWriter *createWinCOFFObjectWriter(raw_ostream &OS, bool is64Bit) {
853 return new WinCOFFObjectWriter(OS, is64Bit);