mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-01 15:11:24 +00:00
1ac7fe0f4d
MC :-) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129923 91177308-0d34-0410-b5e6-96231b3b80d8
888 lines
29 KiB
C++
888 lines
29 KiB
C++
//===-- 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/Support/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;
|
|
class COFFSection;
|
|
|
|
class COFFSymbol {
|
|
public:
|
|
COFF::symbol Data;
|
|
|
|
typedef llvm::SmallVector<AuxSymbol, 1> AuxiliarySymbols;
|
|
|
|
name Name;
|
|
int Index;
|
|
AuxiliarySymbols Aux;
|
|
COFFSymbol *Other;
|
|
COFFSection *Section;
|
|
int Relocations;
|
|
|
|
MCSymbolData const *MCData;
|
|
|
|
COFFSymbol(llvm::StringRef name);
|
|
size_t size() const;
|
|
void set_name_offset(uint32_t Offset);
|
|
|
|
bool should_keep() const;
|
|
};
|
|
|
|
// 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;
|
|
int Number;
|
|
MCSectionData const *MCData;
|
|
COFFSymbol *Symbol;
|
|
relocations Relocations;
|
|
|
|
COFFSection(llvm::StringRef name);
|
|
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 DenseMap<MCSymbol const *, COFFSymbol *> symbol_map;
|
|
typedef DenseMap<MCSection const *, COFFSection *> section_map;
|
|
|
|
// Root level file contents.
|
|
bool Is64Bit;
|
|
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(StringRef Name);
|
|
COFFSymbol *GetOrCreateCOFFSymbol(const MCSymbol * Symbol);
|
|
COFFSection *createSection(StringRef Name);
|
|
|
|
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);
|
|
|
|
void MakeSymbolReal(COFFSymbol &S, size_t Index);
|
|
void MakeSectionReal(COFFSection &S, size_t Number);
|
|
|
|
bool ExportSection(COFFSection const *S);
|
|
bool ExportSymbol(MCSymbolData const &SymbolData, MCAssembler &Asm);
|
|
|
|
bool IsPhysicalSection(COFFSection *S);
|
|
|
|
// 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, const MCAsmLayout &Layout);
|
|
|
|
void RecordRelocation(const MCAssembler &Asm,
|
|
const MCAsmLayout &Layout,
|
|
const MCFragment *Fragment,
|
|
const MCFixup &Fixup,
|
|
MCValue Target,
|
|
uint64_t &FixedValue);
|
|
|
|
void WriteObject(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)
|
|
: Name(name.begin(), name.end())
|
|
, Other(NULL)
|
|
, Section(NULL)
|
|
, Relocations(0)
|
|
, 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);
|
|
}
|
|
|
|
/// logic to decide if the symbol should be reported in the symbol table
|
|
bool COFFSymbol::should_keep() const {
|
|
// no section means its external, keep it
|
|
if (Section == NULL)
|
|
return true;
|
|
|
|
// if it has relocations pointing at it, keep it
|
|
if (Relocations > 0) {
|
|
assert(Section->Number != -1 && "Sections with relocations must be real!");
|
|
return true;
|
|
}
|
|
|
|
// if the section its in is being droped, drop it
|
|
if (Section->Number == -1)
|
|
return false;
|
|
|
|
// if it is the section symbol, keep it
|
|
if (Section->Symbol == this)
|
|
return true;
|
|
|
|
// if its temporary, drop it
|
|
if (MCData && MCData->getSymbol().isTemporary())
|
|
return false;
|
|
|
|
// otherwise, keep it
|
|
return true;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Section class implementation
|
|
|
|
COFFSection::COFFSection(llvm::StringRef name)
|
|
: Name(name)
|
|
, MCData(NULL)
|
|
, Symbol(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)
|
|
, Is64Bit(is64Bit) {
|
|
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(StringRef Name) {
|
|
return createCOFFEntity<COFFSymbol>(Name, Symbols);
|
|
}
|
|
|
|
COFFSymbol *WinCOFFObjectWriter::GetOrCreateCOFFSymbol(const MCSymbol * Symbol){
|
|
symbol_map::iterator i = SymbolMap.find(Symbol);
|
|
if (i != SymbolMap.end())
|
|
return i->second;
|
|
COFFSymbol *RetSymbol
|
|
= createCOFFEntity<COFFSymbol>(Symbol->getName(), Symbols);
|
|
SymbolMap[Symbol] = RetSymbol;
|
|
return RetSymbol;
|
|
}
|
|
|
|
COFFSection *WinCOFFObjectWriter::createSection(llvm::StringRef Name) {
|
|
return createCOFFEntity<COFFSection>(Name, Sections);
|
|
}
|
|
|
|
/// 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.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) {
|
|
assert(SectionData.getSection().getVariant() == MCSection::SV_COFF
|
|
&& "Got non COFF section in the COFF backend!");
|
|
// 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->Symbol = coff_symbol;
|
|
coff_symbol->Section = coff_section;
|
|
coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_STATIC;
|
|
|
|
// 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.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.getSection()] = 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 = GetOrCreateCOFFSymbol(&SymbolData.getSymbol());
|
|
|
|
coff_symbol->Data.Type = (SymbolData.getFlags() & 0x0000FFFF) >> 0;
|
|
coff_symbol->Data.StorageClass = (SymbolData.getFlags() & 0x00FF0000) >> 16;
|
|
|
|
if (SymbolData.getFlags() & COFF::SF_WeakExternal) {
|
|
coff_symbol->Data.StorageClass = COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
|
|
|
|
if (SymbolData.getSymbol().isVariable()) {
|
|
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);
|
|
coff_symbol->Other = GetOrCreateCOFFSymbol(&SymbolRef->getSymbol());
|
|
} else {
|
|
std::string WeakName = std::string(".weak.")
|
|
+ SymbolData.getSymbol().getName().str()
|
|
+ ".default";
|
|
COFFSymbol *WeakDefault = createSymbol(WeakName);
|
|
WeakDefault->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
|
|
WeakDefault->Data.StorageClass = COFF::IMAGE_SYM_CLASS_EXTERNAL;
|
|
WeakDefault->Data.Type = 0;
|
|
WeakDefault->Data.Value = 0;
|
|
coff_symbol->Other = WeakDefault;
|
|
}
|
|
|
|
// 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;
|
|
}
|
|
|
|
// 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.Fragment != NULL)
|
|
coff_symbol->Section =
|
|
SectionMap[&SymbolData.Fragment->getParent()->getSection()];
|
|
|
|
// Bind internal COFF symbol to MC symbol.
|
|
coff_symbol->MCData = &SymbolData;
|
|
SymbolMap[&SymbolData.getSymbol()] = coff_symbol;
|
|
}
|
|
|
|
/// making a section real involves assigned it a number and putting
|
|
/// name into the string table if needed
|
|
void WinCOFFObjectWriter::MakeSectionReal(COFFSection &S, size_t Number) {
|
|
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.");
|
|
|
|
std::sprintf(S.Header.Name, "/%d", unsigned(StringTableEntry));
|
|
} else
|
|
std::memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
|
|
|
|
S.Number = Number;
|
|
S.Symbol->Data.SectionNumber = S.Number;
|
|
S.Symbol->Aux[0].Aux.SectionDefinition.Number = S.Number;
|
|
}
|
|
|
|
void WinCOFFObjectWriter::MakeSymbolReal(COFFSymbol &S, size_t Index) {
|
|
if (S.Name.size() > COFF::NameSize) {
|
|
size_t StringTableEntry = Strings.insert(S.Name.c_str());
|
|
|
|
S.set_name_offset(StringTableEntry);
|
|
} else
|
|
std::memcpy(S.Data.Name, S.Name.c_str(), S.Name.size());
|
|
S.Index = Index;
|
|
}
|
|
|
|
bool WinCOFFObjectWriter::ExportSection(COFFSection const *S) {
|
|
return !S->MCData->getFragmentList().empty();
|
|
}
|
|
|
|
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 non-variable symbols are exported,
|
|
// the linker will sort the rest out for us.
|
|
return SymbolData.isExternal() || !SymbolData.getSymbol().isVariable();
|
|
}
|
|
|
|
bool WinCOFFObjectWriter::IsPhysicalSection(COFFSection *S) {
|
|
return (S->Header.Characteristics
|
|
& COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// 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,
|
|
const MCAsmLayout &Layout) {
|
|
// "Define" each section & symbol. This creates section & symbol
|
|
// entries in the staging area.
|
|
|
|
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!");
|
|
|
|
const MCSymbol *A = &Target.getSymA()->getSymbol();
|
|
MCSymbolData &A_SD = Asm.getSymbolData(*A);
|
|
|
|
MCSectionData const *SectionData = Fragment->getParent();
|
|
|
|
// Mark this symbol as requiring an entry in the symbol table.
|
|
assert(SectionMap.find(&SectionData->getSection()) != SectionMap.end() &&
|
|
"Section must already have been defined in ExecutePostLayoutBinding!");
|
|
assert(SymbolMap.find(&A_SD.getSymbol()) != SymbolMap.end() &&
|
|
"Symbol must already have been defined in ExecutePostLayoutBinding!");
|
|
|
|
COFFSection *coff_section = SectionMap[&SectionData->getSection()];
|
|
COFFSymbol *coff_symbol = SymbolMap[&A_SD.getSymbol()];
|
|
const MCSymbolRefExpr *SymA = Target.getSymA();
|
|
const MCSymbolRefExpr *SymB = Target.getSymB();
|
|
const bool CrossSection = SymB &&
|
|
&SymA->getSymbol().getSection() != &SymB->getSymbol().getSection();
|
|
|
|
if (Target.getSymB()) {
|
|
const MCSymbol *B = &Target.getSymB()->getSymbol();
|
|
MCSymbolData &B_SD = Asm.getSymbolData(*B);
|
|
|
|
// Offset of the symbol in the section
|
|
int64_t a = Layout.getSymbolOffset(&B_SD);
|
|
|
|
// Ofeset of the relocation in the section
|
|
int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
|
|
|
|
FixedValue = b - a;
|
|
// In the case where we have SymbA and SymB, we just need to store the delta
|
|
// between the two symbols. Update FixedValue to account for the delta, and
|
|
// skip recording the relocation.
|
|
if (!CrossSection)
|
|
return;
|
|
} else {
|
|
FixedValue = Target.getConstant();
|
|
}
|
|
|
|
COFFRelocation Reloc;
|
|
|
|
Reloc.Data.SymbolTableIndex = 0;
|
|
Reloc.Data.VirtualAddress = Layout.getFragmentOffset(Fragment);
|
|
|
|
// Turn relocations for temporary symbols into section relocations.
|
|
if (coff_symbol->MCData->getSymbol().isTemporary() || CrossSection) {
|
|
Reloc.Symb = coff_symbol->Section->Symbol;
|
|
FixedValue += Layout.getFragmentOffset(coff_symbol->MCData->Fragment)
|
|
+ coff_symbol->MCData->getOffset();
|
|
} else
|
|
Reloc.Symb = coff_symbol;
|
|
|
|
++Reloc.Symb->Relocations;
|
|
|
|
Reloc.Data.VirtualAddress += Fixup.getOffset();
|
|
|
|
unsigned FixupKind = Fixup.getKind();
|
|
|
|
if (CrossSection)
|
|
FixupKind = FK_PCRel_4;
|
|
|
|
switch (FixupKind) {
|
|
case FK_PCRel_4:
|
|
case X86::reloc_riprel_4byte:
|
|
case X86::reloc_riprel_4byte_movq_load:
|
|
Reloc.Data.Type = Is64Bit ? COFF::IMAGE_REL_AMD64_REL32
|
|
: COFF::IMAGE_REL_I386_REL32;
|
|
// FIXME: Can anyone explain what this does other than adjust for the size
|
|
// of the offset?
|
|
FixedValue += 4;
|
|
break;
|
|
case FK_Data_4:
|
|
case X86::reloc_signed_4byte:
|
|
Reloc.Data.Type = Is64Bit ? COFF::IMAGE_REL_AMD64_ADDR32
|
|
: COFF::IMAGE_REL_I386_DIR32;
|
|
break;
|
|
case FK_Data_8:
|
|
if (Is64Bit)
|
|
Reloc.Data.Type = COFF::IMAGE_REL_AMD64_ADDR64;
|
|
else
|
|
llvm_unreachable("unsupported relocation type");
|
|
break;
|
|
default:
|
|
llvm_unreachable("unsupported relocation type");
|
|
}
|
|
|
|
coff_section->Relocations.push_back(Reloc);
|
|
}
|
|
|
|
void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
|
|
const MCAsmLayout &Layout) {
|
|
// Assign symbol and section indexes and offsets.
|
|
Header.NumberOfSections = 0;
|
|
|
|
for (sections::iterator i = Sections.begin(),
|
|
e = Sections.end(); i != e; i++) {
|
|
if (Layout.getSectionAddressSize((*i)->MCData) > 0) {
|
|
MakeSectionReal(**i, ++Header.NumberOfSections);
|
|
} else {
|
|
(*i)->Number = -1;
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
// Update section number & offset for symbols that have them.
|
|
if ((SymbolData != NULL) && (SymbolData->Fragment != NULL)) {
|
|
assert(coff_symbol->Section != NULL);
|
|
|
|
coff_symbol->Data.SectionNumber = coff_symbol->Section->Number;
|
|
coff_symbol->Data.Value = Layout.getFragmentOffset(SymbolData->Fragment)
|
|
+ SymbolData->Offset;
|
|
}
|
|
|
|
if (coff_symbol->should_keep()) {
|
|
MakeSymbolReal(*coff_symbol, Header.NumberOfSymbols++);
|
|
|
|
// Update auxiliary symbol info.
|
|
coff_symbol->Data.NumberOfAuxSymbols = coff_symbol->Aux.size();
|
|
Header.NumberOfSymbols += coff_symbol->Data.NumberOfAuxSymbols;
|
|
} else
|
|
coff_symbol->Index = -1;
|
|
}
|
|
|
|
// Fixup weak external references.
|
|
for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
|
|
COFFSymbol *coff_symbol = *i;
|
|
if (coff_symbol->Other != NULL) {
|
|
assert(coff_symbol->Index != -1);
|
|
assert(coff_symbol->Aux.size() == 1 &&
|
|
"Symbol must contain one aux symbol!");
|
|
assert(coff_symbol->Aux[0].AuxType == ATWeakExternal &&
|
|
"Symbol's aux symbol must be a Weak External!");
|
|
coff_symbol->Aux[0].Aux.WeakExternal.TagIndex = coff_symbol->Other->Index;
|
|
}
|
|
}
|
|
|
|
// Assign file offsets to COFF object file structures.
|
|
|
|
unsigned offset = 0;
|
|
|
|
offset += COFF::HeaderSize;
|
|
offset += COFF::SectionSize * Header.NumberOfSections;
|
|
|
|
for (MCAssembler::const_iterator i = Asm.begin(),
|
|
e = Asm.end();
|
|
i != e; i++) {
|
|
COFFSection *Sec = SectionMap[&i->getSection()];
|
|
|
|
if (Sec->Number == -1)
|
|
continue;
|
|
|
|
Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(i);
|
|
|
|
if (IsPhysicalSection(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) {
|
|
assert((*cr).Symb->Index != -1);
|
|
(*cr).Data.SymbolTableIndex = (*cr).Symb->Index;
|
|
}
|
|
}
|
|
|
|
assert(Sec->Symbol->Aux.size() == 1
|
|
&& "Section's symbol must have one aux!");
|
|
AuxSymbol &Aux = Sec->Symbol->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++)
|
|
if ((*i)->Number != -1)
|
|
WriteSectionHeader((*i)->Header);
|
|
|
|
for (i = Sections.begin(), ie = Sections.end(),
|
|
j = Asm.begin(), je = Asm.end();
|
|
(i != ie) && (j != je); ++i, ++j) {
|
|
|
|
if ((*i)->Number == -1)
|
|
continue;
|
|
|
|
if ((*i)->Header.PointerToRawData != 0) {
|
|
assert(OS.tell() == (*i)->Header.PointerToRawData &&
|
|
"Section::PointerToRawData is insane!");
|
|
|
|
Asm.WriteSectionData(j, Layout);
|
|
}
|
|
|
|
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++)
|
|
if ((*i)->Index != -1)
|
|
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);
|
|
}
|
|
}
|