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llvm-project/llvm/lib/MC/WinCOFFObjectWriter.cpp

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//===-- llvm/MC/WinCOFFObjectWriter.cpp -------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains an implementation of a Win32 COFF object file writer.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "WinCOFFObjectWriter"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCValue.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/COFF.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/System/TimeValue.h"
#include "../Target/X86/X86FixupKinds.h"
#include <cstdio>
using namespace llvm;
namespace {
typedef llvm::SmallString<COFF::NameSize> name;
enum AuxiliaryType {
ATFunctionDefinition,
ATbfAndefSymbol,
ATWeakExternal,
ATFile,
ATSectionDefinition
};
struct AuxSymbol {
AuxiliaryType AuxType;
COFF::Auxiliary Aux;
};
class COFFSymbol {
public:
COFF::symbol Data;
typedef llvm::SmallVector<AuxSymbol, 1> AuxiliarySymbols;
name Name;
size_t Index;
AuxiliarySymbols Aux;
COFFSymbol *Other;
MCSymbolData const *MCData;
COFFSymbol(llvm::StringRef name, size_t index);
size_t size() const;
void set_name_offset(uint32_t Offset);
};
// This class contains staging data for a COFF relocation entry.
struct COFFRelocation {
COFF::relocation Data;
COFFSymbol *Symb;
COFFRelocation() : Symb(NULL) {}
static size_t size() { return COFF::RelocationSize; }
};
typedef std::vector<COFFRelocation> relocations;
class COFFSection {
public:
COFF::section Header;
std::string Name;
size_t Number;
MCSectionData const *MCData;
COFFSymbol *Symb;
relocations Relocations;
COFFSection(llvm::StringRef name, size_t Index);
static size_t size();
};
// This class holds the COFF string table.
class StringTable {
typedef llvm::StringMap<size_t> map;
map Map;
void update_length();
public:
std::vector<char> Data;
StringTable();
size_t size() const;
size_t insert(llvm::StringRef String);
};
class WinCOFFObjectWriter : public MCObjectWriter {
public:
typedef std::vector<COFFSymbol*> symbols;
typedef std::vector<COFFSection*> sections;
typedef StringMap<COFFSymbol *> name_symbol_map;
typedef StringMap<COFFSection *> name_section_map;
typedef DenseMap<MCSymbolData const *, COFFSymbol *> symbol_map;
typedef DenseMap<MCSectionData const *, COFFSection *> section_map;
// Root level file contents.
COFF::header Header;
sections Sections;
symbols Symbols;
StringTable Strings;
// Maps used during object file creation.
section_map SectionMap;
symbol_map SymbolMap;
WinCOFFObjectWriter(raw_ostream &OS, bool is64Bit);
~WinCOFFObjectWriter();
COFFSymbol *createSymbol(llvm::StringRef Name);
COFFSection *createSection(llvm::StringRef Name);
void InitCOFFEntity(COFFSymbol &Symbol);
void InitCOFFEntity(COFFSection &Section);
template <typename object_t, typename list_t>
object_t *createCOFFEntity(llvm::StringRef Name, list_t &List);
void DefineSection(MCSectionData const &SectionData);
void DefineSymbol(MCSymbolData const &SymbolData, MCAssembler &Assembler);
bool ExportSection(COFFSection *S);
bool ExportSymbol(MCSymbolData const &SymbolData, MCAssembler &Asm);
// Entity writing methods.
void WriteFileHeader(const COFF::header &Header);
void WriteSymbol(const COFFSymbol *S);
void WriteAuxiliarySymbols(const COFFSymbol::AuxiliarySymbols &S);
void WriteSectionHeader(const COFF::section &S);
void WriteRelocation(const COFF::relocation &R);
// MCObjectWriter interface implementation.
void ExecutePostLayoutBinding(MCAssembler &Asm);
void RecordRelocation(const MCAssembler &Asm,
const MCAsmLayout &Layout,
const MCFragment *Fragment,
const MCFixup &Fixup,
MCValue Target,
uint64_t &FixedValue);
void WriteObject(const MCAssembler &Asm, const MCAsmLayout &Layout);
};
}
static inline void write_uint32_le(void *Data, uint32_t const &Value) {
uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
Ptr[0] = (Value & 0x000000FF) >> 0;
Ptr[1] = (Value & 0x0000FF00) >> 8;
Ptr[2] = (Value & 0x00FF0000) >> 16;
Ptr[3] = (Value & 0xFF000000) >> 24;
}
static inline void write_uint16_le(void *Data, uint16_t const &Value) {
uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
Ptr[0] = (Value & 0x00FF) >> 0;
Ptr[1] = (Value & 0xFF00) >> 8;
}
static inline void write_uint8_le(void *Data, uint8_t const &Value) {
uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
Ptr[0] = (Value & 0xFF) >> 0;
}
//------------------------------------------------------------------------------
// Symbol class implementation
COFFSymbol::COFFSymbol(llvm::StringRef name, size_t index)
: Name(name.begin(), name.end()), Index(-1)
, Other(NULL), MCData(NULL) {
memset(&Data, 0, sizeof(Data));
}
size_t COFFSymbol::size() const {
return COFF::SymbolSize + (Data.NumberOfAuxSymbols * COFF::SymbolSize);
}
// In the case that the name does not fit within 8 bytes, the offset
// into the string table is stored in the last 4 bytes instead, leaving
// the first 4 bytes as 0.
void COFFSymbol::set_name_offset(uint32_t Offset) {
write_uint32_le(Data.Name + 0, 0);
write_uint32_le(Data.Name + 4, Offset);
}
//------------------------------------------------------------------------------
// Section class implementation
COFFSection::COFFSection(llvm::StringRef name, size_t Index)
: Name(name), Number(Index + 1)
, MCData(NULL), Symb(NULL) {
memset(&Header, 0, sizeof(Header));
}
size_t COFFSection::size() {
return COFF::SectionSize;
}
//------------------------------------------------------------------------------
// StringTable class implementation
/// Write the length of the string table into Data.
/// The length of the string table includes uint32 length header.
void StringTable::update_length() {
write_uint32_le(&Data.front(), Data.size());
}
StringTable::StringTable() {
// The string table data begins with the length of the entire string table
// including the length header. Allocate space for this header.
Data.resize(4);
}
size_t StringTable::size() const {
return Data.size();
}
/// Add String to the table iff it is not already there.
/// @returns the index into the string table where the string is now located.
size_t StringTable::insert(llvm::StringRef String) {
map::iterator i = Map.find(String);
if (i != Map.end())
return i->second;
size_t Offset = Data.size();
// Insert string data into string table.
Data.insert(Data.end(), String.begin(), String.end());
Data.push_back('\0');
// Put a reference to it in the map.
Map[String] = Offset;
// Update the internal length field.
update_length();
return Offset;
}
//------------------------------------------------------------------------------
// WinCOFFObjectWriter class implementation
WinCOFFObjectWriter::WinCOFFObjectWriter(raw_ostream &OS, bool is64Bit)
: MCObjectWriter(OS, true) {
memset(&Header, 0, sizeof(Header));
is64Bit ? Header.Machine = COFF::IMAGE_FILE_MACHINE_AMD64
: Header.Machine = COFF::IMAGE_FILE_MACHINE_I386;
}
WinCOFFObjectWriter::~WinCOFFObjectWriter() {
for (symbols::iterator I = Symbols.begin(), E = Symbols.end(); I != E; ++I)
delete *I;
for (sections::iterator I = Sections.begin(), E = Sections.end(); I != E; ++I)
delete *I;
}
COFFSymbol *WinCOFFObjectWriter::createSymbol(llvm::StringRef Name) {
return createCOFFEntity<COFFSymbol>(Name, Symbols);
}
COFFSection *WinCOFFObjectWriter::createSection(llvm::StringRef Name) {
return createCOFFEntity<COFFSection>(Name, Sections);
}
/// This function initializes a symbol by entering its name into the string
/// table if it is too long to fit in the symbol table header.
void WinCOFFObjectWriter::InitCOFFEntity(COFFSymbol &S) {
if (S.Name.size() > COFF::NameSize) {
size_t StringTableEntry = Strings.insert(S.Name.c_str());
S.set_name_offset(StringTableEntry);
} else
memcpy(S.Data.Name, S.Name.c_str(), S.Name.size());
}
/// This function initializes a section by entering its name into the string
/// table if it is too long to fit in the section table header.
void WinCOFFObjectWriter::InitCOFFEntity(COFFSection &S) {
if (S.Name.size() > COFF::NameSize) {
size_t StringTableEntry = Strings.insert(S.Name.c_str());
// FIXME: Why is this number 999999? This number is never mentioned in the
// spec. I'm assuming this is due to the printed value needing to fit into
// the S.Header.Name field. In which case why not 9999999 (7 9's instead of
// 6)? The spec does not state if this entry should be null terminated in
// this case, and thus this seems to be the best way to do it. I think I
// just solved my own FIXME...
if (StringTableEntry > 999999)
report_fatal_error("COFF string table is greater than 999999 bytes.");
sprintf(S.Header.Name, "/%d", (unsigned)StringTableEntry);
} else
memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
}
/// A template used to lookup or create a symbol/section, and initialize it if
/// needed.
template <typename object_t, typename list_t>
object_t *WinCOFFObjectWriter::createCOFFEntity(llvm::StringRef Name,
list_t &List) {
object_t *Object = new object_t(Name, List.size());
InitCOFFEntity(*Object);
List.push_back(Object);
return Object;
}
/// This function takes a section data object from the assembler
/// and creates the associated COFF section staging object.
void WinCOFFObjectWriter::DefineSection(MCSectionData const &SectionData) {
// FIXME: Not sure how to verify this (at least in a debug build).
MCSectionCOFF const &Sec =
static_cast<MCSectionCOFF const &>(SectionData.getSection());
COFFSection *coff_section = createSection(Sec.getSectionName());
COFFSymbol *coff_symbol = createSymbol(Sec.getSectionName());
coff_section->Symb = coff_symbol;
coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_STATIC;
coff_symbol->Data.SectionNumber = coff_section->Number;
// In this case the auxiliary symbol is a Section Definition.
coff_symbol->Aux.resize(1);
memset(&coff_symbol->Aux[0], 0, sizeof(coff_symbol->Aux[0]));
coff_symbol->Aux[0].AuxType = ATSectionDefinition;
coff_symbol->Aux[0].Aux.SectionDefinition.Number = coff_section->Number;
coff_symbol->Aux[0].Aux.SectionDefinition.Selection = Sec.getSelection();
coff_section->Header.Characteristics = Sec.getCharacteristics();
uint32_t &Characteristics = coff_section->Header.Characteristics;
switch (SectionData.getAlignment()) {
case 1: Characteristics |= COFF::IMAGE_SCN_ALIGN_1BYTES; break;
case 2: Characteristics |= COFF::IMAGE_SCN_ALIGN_2BYTES; break;
case 4: Characteristics |= COFF::IMAGE_SCN_ALIGN_4BYTES; break;
case 8: Characteristics |= COFF::IMAGE_SCN_ALIGN_8BYTES; break;
case 16: Characteristics |= COFF::IMAGE_SCN_ALIGN_16BYTES; break;
case 32: Characteristics |= COFF::IMAGE_SCN_ALIGN_32BYTES; break;
case 64: Characteristics |= COFF::IMAGE_SCN_ALIGN_64BYTES; break;
case 128: Characteristics |= COFF::IMAGE_SCN_ALIGN_128BYTES; break;
case 256: Characteristics |= COFF::IMAGE_SCN_ALIGN_256BYTES; break;
case 512: Characteristics |= COFF::IMAGE_SCN_ALIGN_512BYTES; break;
case 1024: Characteristics |= COFF::IMAGE_SCN_ALIGN_1024BYTES; break;
case 2048: Characteristics |= COFF::IMAGE_SCN_ALIGN_2048BYTES; break;
case 4096: Characteristics |= COFF::IMAGE_SCN_ALIGN_4096BYTES; break;
case 8192: Characteristics |= COFF::IMAGE_SCN_ALIGN_8192BYTES; break;
default:
llvm_unreachable("unsupported section alignment");
}
// Bind internal COFF section to MC section.
coff_section->MCData = &SectionData;
SectionMap[&SectionData] = coff_section;
}
/// This function takes a section data object from the assembler
/// and creates the associated COFF symbol staging object.
void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
MCAssembler &Assembler) {
COFFSymbol *coff_symbol = createSymbol(SymbolData.getSymbol().getName());
coff_symbol->Data.Type = (SymbolData.getFlags() & 0x0000FFFF) >> 0;
coff_symbol->Data.StorageClass = (SymbolData.getFlags() & 0x00FF0000) >> 16;
// If no storage class was specified in the streamer, define it here.
if (coff_symbol->Data.StorageClass == 0) {
bool external = SymbolData.isExternal() || (SymbolData.Fragment == NULL);
coff_symbol->Data.StorageClass =
external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
}
if (SymbolData.getFlags() & COFF::SF_WeakReference) {
coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
const MCExpr *Value = SymbolData.getSymbol().getVariableValue();
// FIXME: This assert message isn't very good.
assert(Value->getKind() == MCExpr::SymbolRef &&
"Value must be a SymbolRef!");
const MCSymbolRefExpr *SymbolRef =
static_cast<const MCSymbolRefExpr *>(Value);
const MCSymbolData &OtherSymbolData =
Assembler.getSymbolData(SymbolRef->getSymbol());
// FIXME: This assert message isn't very good.
assert(SymbolMap.find(&OtherSymbolData) != SymbolMap.end() &&
"OtherSymbolData must be in the symbol map!");
coff_symbol->Other = SymbolMap[&OtherSymbolData];
// Setup the Weak External auxiliary symbol.
coff_symbol->Aux.resize(1);
memset(&coff_symbol->Aux[0], 0, sizeof(coff_symbol->Aux[0]));
coff_symbol->Aux[0].AuxType = ATWeakExternal;
coff_symbol->Aux[0].Aux.WeakExternal.TagIndex = 0;
coff_symbol->Aux[0].Aux.WeakExternal.Characteristics =
COFF::IMAGE_WEAK_EXTERN_SEARCH_LIBRARY;
}
// Bind internal COFF symbol to MC symbol.
coff_symbol->MCData = &SymbolData;
SymbolMap[&SymbolData] = coff_symbol;
}
bool WinCOFFObjectWriter::ExportSection(COFFSection *S) {
return (S->Header.Characteristics
& COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0;
}
bool WinCOFFObjectWriter::ExportSymbol(MCSymbolData const &SymbolData,
MCAssembler &Asm) {
// This doesn't seem to be right. Strings referred to from the .data section
// need symbols so they can be linked to code in the .text section right?
// return Asm.isSymbolLinkerVisible (&SymbolData);
// For now, all symbols are exported, the linker will sort it out for us.
return true;
}
//------------------------------------------------------------------------------
// entity writing methods
void WinCOFFObjectWriter::WriteFileHeader(const COFF::header &Header) {
WriteLE16(Header.Machine);
WriteLE16(Header.NumberOfSections);
WriteLE32(Header.TimeDateStamp);
WriteLE32(Header.PointerToSymbolTable);
WriteLE32(Header.NumberOfSymbols);
WriteLE16(Header.SizeOfOptionalHeader);
WriteLE16(Header.Characteristics);
}
void WinCOFFObjectWriter::WriteSymbol(const COFFSymbol *S) {
WriteBytes(StringRef(S->Data.Name, COFF::NameSize));
WriteLE32(S->Data.Value);
WriteLE16(S->Data.SectionNumber);
WriteLE16(S->Data.Type);
Write8(S->Data.StorageClass);
Write8(S->Data.NumberOfAuxSymbols);
WriteAuxiliarySymbols(S->Aux);
}
void WinCOFFObjectWriter::WriteAuxiliarySymbols(
const COFFSymbol::AuxiliarySymbols &S) {
for(COFFSymbol::AuxiliarySymbols::const_iterator i = S.begin(), e = S.end();
i != e; ++i) {
switch(i->AuxType) {
case ATFunctionDefinition:
WriteLE32(i->Aux.FunctionDefinition.TagIndex);
WriteLE32(i->Aux.FunctionDefinition.TotalSize);
WriteLE32(i->Aux.FunctionDefinition.PointerToLinenumber);
WriteLE32(i->Aux.FunctionDefinition.PointerToNextFunction);
WriteZeros(sizeof(i->Aux.FunctionDefinition.unused));
break;
case ATbfAndefSymbol:
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused1));
WriteLE16(i->Aux.bfAndefSymbol.Linenumber);
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused2));
WriteLE32(i->Aux.bfAndefSymbol.PointerToNextFunction);
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused3));
break;
case ATWeakExternal:
WriteLE32(i->Aux.WeakExternal.TagIndex);
WriteLE32(i->Aux.WeakExternal.Characteristics);
WriteZeros(sizeof(i->Aux.WeakExternal.unused));
break;
case ATFile:
WriteBytes(StringRef(reinterpret_cast<const char *>(i->Aux.File.FileName),
sizeof(i->Aux.File.FileName)));
break;
case ATSectionDefinition:
WriteLE32(i->Aux.SectionDefinition.Length);
WriteLE16(i->Aux.SectionDefinition.NumberOfRelocations);
WriteLE16(i->Aux.SectionDefinition.NumberOfLinenumbers);
WriteLE32(i->Aux.SectionDefinition.CheckSum);
WriteLE16(i->Aux.SectionDefinition.Number);
Write8(i->Aux.SectionDefinition.Selection);
WriteZeros(sizeof(i->Aux.SectionDefinition.unused));
break;
}
}
}
void WinCOFFObjectWriter::WriteSectionHeader(const COFF::section &S) {
WriteBytes(StringRef(S.Name, COFF::NameSize));
WriteLE32(S.VirtualSize);
WriteLE32(S.VirtualAddress);
WriteLE32(S.SizeOfRawData);
WriteLE32(S.PointerToRawData);
WriteLE32(S.PointerToRelocations);
WriteLE32(S.PointerToLineNumbers);
WriteLE16(S.NumberOfRelocations);
WriteLE16(S.NumberOfLineNumbers);
WriteLE32(S.Characteristics);
}
void WinCOFFObjectWriter::WriteRelocation(const COFF::relocation &R) {
WriteLE32(R.VirtualAddress);
WriteLE32(R.SymbolTableIndex);
WriteLE16(R.Type);
}
////////////////////////////////////////////////////////////////////////////////
// MCObjectWriter interface implementations
void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) {
// "Define" each section & symbol. This creates section & symbol
// entries in the staging area and gives them their final indexes.
for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; i++)
DefineSection(*i);
for (MCAssembler::const_symbol_iterator i = Asm.symbol_begin(),
e = Asm.symbol_end(); i != e; i++) {
if (ExportSymbol(*i, Asm))
DefineSymbol(*i, Asm);
}
}
void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
const MCAsmLayout &Layout,
const MCFragment *Fragment,
const MCFixup &Fixup,
MCValue Target,
uint64_t &FixedValue) {
assert(Target.getSymA() != NULL && "Relocation must reference a symbol!");
assert(Target.getSymB() == NULL &&
"Relocation must reference only one symbol!");
MCSectionData const *SectionData = Fragment->getParent();
MCSymbolData const *SymbolData =
&Asm.getSymbolData(Target.getSymA()->getSymbol());
assert(SectionMap.find(SectionData) != SectionMap.end() &&
"Section must already have been defined in ExecutePostLayoutBinding!");
assert(SymbolMap.find(SymbolData) != SymbolMap.end() &&
"Symbol must already have been defined in ExecutePostLayoutBinding!");
COFFSection *coff_section = SectionMap[SectionData];
COFFSymbol *coff_symbol = SymbolMap[SymbolData];
FixedValue = Target.getConstant();
COFFRelocation Reloc;
Reloc.Data.SymbolTableIndex = 0;
Reloc.Data.VirtualAddress = Layout.getFragmentOffset(Fragment);
Reloc.Symb = coff_symbol;
Reloc.Data.VirtualAddress += Fixup.getOffset();
COFF::RelocationTypeX86 Type;
if (Header.Machine == COFF::IMAGE_FILE_MACHINE_I386) {
switch (Fixup.getKind()) {
case X86::reloc_pcrel_4byte:
Type = COFF::IMAGE_REL_I386_REL32;
FixedValue += 4;
break;
case FK_Data_4:
Type = COFF::IMAGE_REL_I386_DIR32;
break;
default:
llvm_unreachable("unsupported relocation type");
}
} else if (Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64) {
switch (Fixup.getKind()) {
case FK_Data_8:
Type = COFF::IMAGE_REL_AMD64_ADDR64;
break;
case X86::reloc_pcrel_4byte:
case X86::reloc_riprel_4byte:
Type = COFF::IMAGE_REL_AMD64_REL32;
FixedValue += 4;
break;
case FK_Data_4:
Type = COFF::IMAGE_REL_AMD64_ADDR32;
break;
default:
llvm_unreachable("unsupported relocation type");
}
} else
llvm_unreachable("unknown target architecture");
Reloc.Data.Type = Type;
coff_section->Relocations.push_back(Reloc);
}
void WinCOFFObjectWriter::WriteObject(const MCAssembler &Asm,
const MCAsmLayout &Layout) {
// Assign symbol and section indexes and offsets.
Header.NumberOfSymbols = 0;
for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
COFFSymbol *coff_symbol = *i;
MCSymbolData const *SymbolData = coff_symbol->MCData;
coff_symbol->Index = Header.NumberOfSymbols++;
// Update section number & offset for symbols that have them.
if ((SymbolData != NULL) && (SymbolData->Fragment != NULL)) {
COFFSection *coff_section = SectionMap[SymbolData->Fragment->getParent()];
coff_symbol->Data.SectionNumber = coff_section->Number;
coff_symbol->Data.Value = Layout.getFragmentOffset(SymbolData->Fragment)
+ SymbolData->Offset;
}
// Update auxiliary symbol info.
coff_symbol->Data.NumberOfAuxSymbols = coff_symbol->Aux.size();
Header.NumberOfSymbols += coff_symbol->Data.NumberOfAuxSymbols;
}
// Fixup weak external references.
for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
COFFSymbol *symb = *i;
if (symb->Other != NULL) {
assert(symb->Aux.size() == 1 &&
"Symbol must contain one aux symbol!");
assert(symb->Aux[0].AuxType == ATWeakExternal &&
"Symbol's aux symbol must be a Weak External!");
symb->Aux[0].Aux.WeakExternal.TagIndex = symb->Other->Index;
}
}
// Assign file offsets to COFF object file structures.
unsigned offset = 0;
offset += COFF::HeaderSize;
offset += COFF::SectionSize * Asm.size();
Header.NumberOfSections = Sections.size();
for (MCAssembler::const_iterator i = Asm.begin(),
e = Asm.end();
i != e; i++) {
COFFSection *Sec = SectionMap[i];
Sec->Header.SizeOfRawData = Layout.getSectionFileSize(i);
if (ExportSection(Sec)) {
Sec->Header.PointerToRawData = offset;
offset += Sec->Header.SizeOfRawData;
}
if (Sec->Relocations.size() > 0) {
Sec->Header.NumberOfRelocations = Sec->Relocations.size();
Sec->Header.PointerToRelocations = offset;
offset += COFF::RelocationSize * Sec->Relocations.size();
for (relocations::iterator cr = Sec->Relocations.begin(),
er = Sec->Relocations.end();
cr != er; cr++) {
(*cr).Data.SymbolTableIndex = (*cr).Symb->Index;
}
}
assert(Sec->Symb->Aux.size() == 1 && "Section's symbol must have one aux!");
AuxSymbol &Aux = Sec->Symb->Aux[0];
assert(Aux.AuxType == ATSectionDefinition &&
"Section's symbol's aux symbol must be a Section Definition!");
Aux.Aux.SectionDefinition.Length = Sec->Header.SizeOfRawData;
Aux.Aux.SectionDefinition.NumberOfRelocations =
Sec->Header.NumberOfRelocations;
Aux.Aux.SectionDefinition.NumberOfLinenumbers =
Sec->Header.NumberOfLineNumbers;
}
Header.PointerToSymbolTable = offset;
Header.TimeDateStamp = sys::TimeValue::now().toEpochTime();
// Write it all to disk...
WriteFileHeader(Header);
{
sections::iterator i, ie;
MCAssembler::const_iterator j, je;
for (i = Sections.begin(), ie = Sections.end(); i != ie; i++)
WriteSectionHeader((*i)->Header);
for (i = Sections.begin(), ie = Sections.end(),
j = Asm.begin(), je = Asm.end();
(i != ie) && (j != je); i++, j++) {
if ((*i)->Header.PointerToRawData != 0) {
assert(OS.tell() == (*i)->Header.PointerToRawData &&
"Section::PointerToRawData is insane!");
Asm.WriteSectionData(j, Layout, this);
}
if ((*i)->Relocations.size() > 0) {
assert(OS.tell() == (*i)->Header.PointerToRelocations &&
"Section::PointerToRelocations is insane!");
for (relocations::const_iterator k = (*i)->Relocations.begin(),
ke = (*i)->Relocations.end();
k != ke; k++) {
WriteRelocation(k->Data);
}
} else
assert((*i)->Header.PointerToRelocations == 0 &&
"Section::PointerToRelocations is insane!");
}
}
assert(OS.tell() == Header.PointerToSymbolTable &&
"Header::PointerToSymbolTable is insane!");
for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++)
WriteSymbol(*i);
OS.write((char const *)&Strings.Data.front(), Strings.Data.size());
}
//------------------------------------------------------------------------------
// WinCOFFObjectWriter factory function
namespace llvm {
MCObjectWriter *createWinCOFFObjectWriter(raw_ostream &OS, bool is64Bit) {
return new WinCOFFObjectWriter(OS, is64Bit);
}
}
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