//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "WinCOFFObjectWriter"
-
+#include "llvm/MC/MCWinCOFFObjectWriter.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSection.h"
-#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSectionCOFF.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/Endian.h"
#include "llvm/Support/ErrorHandling.h"
-
#include "llvm/Support/TimeValue.h"
-
-#include "../Target/X86/X86FixupKinds.h"
-
#include <cstdio>
using namespace llvm;
+#define DEBUG_TYPE "WinCOFFObjectWriter"
+
namespace {
-typedef llvm::SmallString<COFF::NameSize> name;
+typedef SmallString<COFF::NameSize> name;
enum AuxiliaryType {
ATFunctionDefinition,
public:
COFF::symbol Data;
- typedef
llvm::SmallVector<AuxSymbol, 1> AuxiliarySymbols;
+ typedef SmallVector<AuxSymbol, 1> AuxiliarySymbols;
name Name;
int Index;
MCSymbolData const *MCData;
- COFFSymbol(llvm::StringRef name);
- size_t size() const;
+ COFFSymbol(StringRef name);
void set_name_offset(uint32_t Offset);
bool should_keep() const;
COFF::relocation Data;
COFFSymbol *Symb;
- COFFRelocation() : Symb(NULL) {}
+ COFFRelocation() : Symb(nullptr) {}
static size_t size() { return COFF::RelocationSize; }
};
COFFSymbol *Symbol;
relocations Relocations;
- COFFSection(llvm::StringRef name);
+ COFFSection(StringRef name);
static size_t size();
};
// This class holds the COFF string table.
class StringTable {
- typedef llvm::StringMap<size_t> map;
+ typedef StringMap<size_t> map;
map Map;
void update_length();
StringTable();
size_t size() const;
- size_t insert(llvm::StringRef String);
+ size_t insert(StringRef String);
+ void clear() {
+ Map.clear();
+ Data.resize(4);
+ update_length();
+ }
};
class WinCOFFObjectWriter : public MCObjectWriter {
public:
- typedef std::vector<COFFSymbol*> symbols;
- typedef std::vector<COFFSection*> sections;
+ typedef std::vector<std::unique_ptr<COFFSymbol>> symbols;
+ typedef std::vector<std::unique_ptr<COFFSection>> sections;
typedef DenseMap<MCSymbol const *, COFFSymbol *> symbol_map;
typedef DenseMap<MCSection const *, COFFSection *> section_map;
+ std::unique_ptr<MCWinCOFFObjectTargetWriter> TargetObjectWriter;
+
// Root level file contents.
- bool Is64Bit;
COFF::header Header;
sections Sections;
symbols Symbols;
section_map SectionMap;
symbol_map SymbolMap;
- WinCOFFObjectWriter(raw_ostream &OS, bool is64Bit);
- ~WinCOFFObjectWriter();
+ bool UseBigObj;
+
+ WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW, raw_ostream &OS);
+
+ void reset() override {
+ memset(&Header, 0, sizeof(Header));
+ Header.Machine = TargetObjectWriter->getMachine();
+ Sections.clear();
+ Symbols.clear();
+ Strings.clear();
+ SectionMap.clear();
+ SymbolMap.clear();
+ MCObjectWriter::reset();
+ }
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);
+ object_t *createCOFFEntity(StringRef Name, list_t &List);
void DefineSection(MCSectionData const &SectionData);
- void DefineSymbol(MCSymbolData const &SymbolData, MCAssembler &Assembler);
+ void DefineSymbol(MCSymbolData const &SymbolData, MCAssembler &Assembler,
+ const MCAsmLayout &Layout);
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 ExportSymbol(const MCSymbol &Symbol, MCAssembler &Asm);
bool IsPhysicalSection(COFFSection *S);
// Entity writing methods.
void WriteFileHeader(const COFF::header &Header);
- void WriteSymbol(const COFFSymbol *S);
+ 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 ExecutePostLayoutBinding(MCAssembler &Asm,
+ const MCAsmLayout &Layout) override;
- virtual bool IsFixupFullyResolved(const MCAssembler &Asm,
- const MCValue Target,
- bool IsPCRel,
- const MCFragment *DF) const;
+ void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCFragment *Fragment, const MCFixup &Fixup,
+ MCValue Target, bool &IsPCRel,
+ uint64_t &FixedValue) override;
- void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout);
+ void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
};
}
-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;
+static inline void write_uint32_le(void *Data, uint32_t Value) {
+ support::endian::write<uint32_t, support::little, support::unaligned>(Data,
+ Value);
}
//------------------------------------------------------------------------------
// Symbol class implementation
-COFFSymbol::COFFSymbol(llvm::StringRef name)
+COFFSymbol::COFFSymbol(StringRef name)
: Name(name.begin(), name.end())
- , Other(NULL)
- , Section(NULL)
+ , Other(nullptr)
+ , Section(nullptr)
, Relocations(0)
- , MCData(NULL) {
+ , MCData(nullptr) {
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.
/// 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)
+ if (!Section)
return true;
// if it has relocations pointing at it, keep it
//------------------------------------------------------------------------------
// Section class implementation
-COFFSection::COFFSection(llvm::StringRef name)
+COFFSection::COFFSection(StringRef name)
: Name(name)
- , MCData(NULL)
- , Symbol(NULL) {
+ , MCData(nullptr)
+ , Symbol(nullptr) {
memset(&Header, 0, sizeof(Header));
}
// 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);
+ update_length();
}
size_t StringTable::size() const {
/// 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) {
+size_t StringTable::insert(StringRef String) {
map::iterator i = Map.find(String);
if (i != Map.end())
//------------------------------------------------------------------------------
// WinCOFFObjectWriter class implementation
-WinCOFFObjectWriter::WinCOFFObjectWriter(raw_ostream &OS, bool is64Bit)
- : MCObjectWriter(OS, true)
- , Is64Bit(is64Bit) {
+WinCOFFObjectWriter::WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW,
+ raw_ostream &OS)
+ : MCObjectWriter(OS, true), TargetObjectWriter(MOTW) {
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;
+ Header.Machine = TargetObjectWriter->getMachine();
}
COFFSymbol *WinCOFFObjectWriter::createSymbol(StringRef Name) {
return RetSymbol;
}
-COFFSection *WinCOFFObjectWriter::createSection(llvm::StringRef Name) {
+COFFSection *WinCOFFObjectWriter::createSection(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,
+object_t *WinCOFFObjectWriter::createCOFFEntity(StringRef Name,
list_t &List) {
- object_t *Object = new object_t(Name);
+ List.push_back(make_unique<object_t>(Name));
- List.push_back(Object);
-
- return Object;
+ return List.back().get();
}
/// 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!");
+ && "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());
+ if (Sec.getSelection() != COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) {
+ if (const MCSymbol *S = Sec.getCOMDATSymbol()) {
+ COFFSymbol *COMDATSymbol = GetOrCreateCOFFSymbol(S);
+ if (COMDATSymbol->Section)
+ report_fatal_error("two sections have the same comdat");
+ COMDATSymbol->Section = coff_section;
+ }
+ }
coff_section->Symbol = coff_symbol;
coff_symbol->Section = coff_section;
SectionMap[&SectionData.getSection()] = coff_section;
}
-/// This function takes a section data object from the assembler
+static uint64_t getSymbolValue(const MCSymbolData &Data,
+ const MCAsmLayout &Layout) {
+ if (Data.isCommon() && Data.isExternal())
+ return Data.getCommonSize();
+
+ uint64_t Res;
+ if (!Layout.getSymbolOffset(&Data, Res))
+ return 0;
+
+ return Res;
+}
+
+/// This function takes a symbol 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;
+ MCAssembler &Assembler,
+ const MCAsmLayout &Layout) {
+ MCSymbol const &Symbol = SymbolData.getSymbol();
+ COFFSymbol *coff_symbol = GetOrCreateCOFFSymbol(&Symbol);
+ SymbolMap[&Symbol] = coff_symbol;
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();
+ if (Symbol.isVariable()) {
+ const MCSymbolRefExpr *SymRef =
+ dyn_cast<MCSymbolRefExpr>(Symbol.getVariableValue());
- // FIXME: This assert message isn't very good.
- assert(Value->getKind() == MCExpr::SymbolRef &&
- "Value must be a SymbolRef!");
+ if (!SymRef)
+ report_fatal_error("Weak externals may only alias symbols");
- const MCSymbolRefExpr *SymbolRef =
- static_cast<const MCSymbolRefExpr *>(Value);
- coff_symbol->Other = GetOrCreateCOFFSymbol(&SymbolRef->getSymbol());
+ coff_symbol->Other = GetOrCreateCOFFSymbol(&SymRef->getSymbol());
} else {
std::string WeakName = std::string(".weak.")
- + SymbolData.getSymbol().getName().str()
+ + Symbol.getName().str()
+ ".default";
COFFSymbol *WeakDefault = createSymbol(WeakName);
WeakDefault->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
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->MCData = &SymbolData;
+ } else {
+ const MCSymbolData &ResSymData = Assembler.getSymbolData(Symbol);
+ const MCSymbol *Base = Layout.getBaseSymbol(Symbol);
+ coff_symbol->Data.Value = getSymbolValue(ResSymData, Layout);
+
+ coff_symbol->Data.Type = (ResSymData.getFlags() & 0x0000FFFF) >> 0;
+ coff_symbol->Data.StorageClass = (ResSymData.getFlags() & 0x00FF0000) >> 16;
+
+ // If no storage class was specified in the streamer, define it here.
+ if (coff_symbol->Data.StorageClass == 0) {
+ bool IsExternal =
+ ResSymData.isExternal() ||
+ (!ResSymData.getFragment() && !ResSymData.getSymbol().isVariable());
+
+ coff_symbol->Data.StorageClass = IsExternal
+ ? COFF::IMAGE_SYM_CLASS_EXTERNAL
+ : COFF::IMAGE_SYM_CLASS_STATIC;
+ }
- coff_symbol->Data.StorageClass =
- external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
- }
+ if (!Base) {
+ coff_symbol->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
+ } else {
+ const MCSymbolData &BaseData = Assembler.getSymbolData(*Base);
+ if (BaseData.Fragment) {
+ COFFSection *Sec =
+ SectionMap[&BaseData.Fragment->getParent()->getSection()];
- if (SymbolData.Fragment != NULL)
- coff_symbol->Section =
- SectionMap[&SymbolData.Fragment->getParent()->getSection()];
+ if (coff_symbol->Section && coff_symbol->Section != Sec)
+ report_fatal_error("conflicting sections for symbol");
- // Bind internal COFF symbol to MC symbol.
- coff_symbol->MCData = &SymbolData;
- SymbolMap[&SymbolData.getSymbol()] = coff_symbol;
+ coff_symbol->Section = Sec;
+ }
+ }
+
+ coff_symbol->MCData = &ResSymData;
+ }
+}
+
+// Maximum offsets for different string table entry encodings.
+static const unsigned Max6DecimalOffset = 999999;
+static const unsigned Max7DecimalOffset = 9999999;
+static const uint64_t MaxBase64Offset = 0xFFFFFFFFFULL; // 64^6, including 0
+
+// Encode a string table entry offset in base 64, padded to 6 chars, and
+// prefixed with a double slash: '//AAAAAA', '//AAAAAB', ...
+// Buffer must be at least 8 bytes large. No terminating null appended.
+static void encodeBase64StringEntry(char* Buffer, uint64_t Value) {
+ assert(Value > Max7DecimalOffset && Value <= MaxBase64Offset &&
+ "Illegal section name encoding for value");
+
+ static const char Alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+/";
+
+ Buffer[0] = '/';
+ Buffer[1] = '/';
+
+ char* Ptr = Buffer + 7;
+ for (unsigned i = 0; i < 6; ++i) {
+ unsigned Rem = Value % 64;
+ Value /= 64;
+ *(Ptr--) = Alphabet[Rem];
+ }
}
/// 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));
+ uint64_t StringTableEntry = Strings.insert(S.Name.c_str());
+
+ if (StringTableEntry <= Max6DecimalOffset) {
+ std::sprintf(S.Header.Name, "/%d", unsigned(StringTableEntry));
+ } else if (StringTableEntry <= Max7DecimalOffset) {
+ // With seven digits, we have to skip the terminating null. Because
+ // sprintf always appends it, we use a larger temporary buffer.
+ char buffer[9] = { };
+ std::sprintf(buffer, "/%d", unsigned(StringTableEntry));
+ std::memcpy(S.Header.Name, buffer, 8);
+ } else if (StringTableEntry <= MaxBase64Offset) {
+ // Starting with 10,000,000, offsets are encoded as base64.
+ encodeBase64StringEntry(S.Header.Name, StringTableEntry);
+ } else {
+ report_fatal_error("COFF string table is greater than 64 GB.");
+ }
} else
std::memcpy(S.Header.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,
+bool WinCOFFObjectWriter::ExportSymbol(const MCSymbol &Symbol,
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);
+ // return Asm.isSymbolLinkerVisible(Symbol);
+
+ // Non-temporary labels should always be visible to the linker.
+ if (!Symbol.isTemporary())
+ return true;
+
+ // Absolute temporary labels are never visible.
+ if (!Symbol.isInSection())
+ return false;
// For now, all non-variable symbols are exported,
// the linker will sort the rest out for us.
- return SymbolData.isExternal() || !SymbolData.getSymbol().isVariable();
+ return !Symbol.isVariable();
}
bool WinCOFFObjectWriter::IsPhysicalSection(COFFSection *S) {
// 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);
+ if (UseBigObj) {
+ WriteLE16(COFF::IMAGE_FILE_MACHINE_UNKNOWN);
+ WriteLE16(0xFFFF);
+ WriteLE16(COFF::BigObjHeader::MinBigObjectVersion);
+ WriteLE16(Header.Machine);
+ WriteLE32(Header.TimeDateStamp);
+ for (uint8_t MagicChar : COFF::BigObjMagic)
+ Write8(MagicChar);
+ WriteLE32(0);
+ WriteLE32(0);
+ WriteLE32(0);
+ WriteLE32(0);
+ WriteLE32(Header.NumberOfSections);
+ WriteLE32(Header.PointerToSymbolTable);
+ WriteLE32(Header.NumberOfSymbols);
+ } else {
+ WriteLE16(Header.Machine);
+ WriteLE16(static_cast<int16_t>(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::WriteSymbol(const COFFSymbol &S) {
+ WriteBytes(StringRef(S.Data.Name, COFF::NameSize));
+ WriteLE32(S.Data.Value);
+ if (UseBigObj)
+ WriteLE32(S.Data.SectionNumber);
+ else
+ WriteLE16(static_cast<int16_t>(S.Data.SectionNumber));
+ WriteLE16(S.Data.Type);
+ Write8(S.Data.StorageClass);
+ Write8(S.Data.NumberOfAuxSymbols);
+ WriteAuxiliarySymbols(S.Aux);
}
void WinCOFFObjectWriter::WriteAuxiliarySymbols(
WriteLE32(i->Aux.FunctionDefinition.PointerToLinenumber);
WriteLE32(i->Aux.FunctionDefinition.PointerToNextFunction);
WriteZeros(sizeof(i->Aux.FunctionDefinition.unused));
+ if (UseBigObj)
+ WriteZeros(COFF::Symbol32Size - COFF::Symbol16Size);
break;
case ATbfAndefSymbol:
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused1));
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused2));
WriteLE32(i->Aux.bfAndefSymbol.PointerToNextFunction);
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused3));
+ if (UseBigObj)
+ WriteZeros(COFF::Symbol32Size - COFF::Symbol16Size);
break;
case ATWeakExternal:
WriteLE32(i->Aux.WeakExternal.TagIndex);
WriteLE32(i->Aux.WeakExternal.Characteristics);
WriteZeros(sizeof(i->Aux.WeakExternal.unused));
+ if (UseBigObj)
+ WriteZeros(COFF::Symbol32Size - COFF::Symbol16Size);
break;
case ATFile:
- WriteBytes(StringRef(reinterpret_cast<const char *>(i->Aux.File.FileName),
- sizeof(i->Aux.File.FileName)));
+ WriteBytes(
+ StringRef(reinterpret_cast<const char *>(&i->Aux),
+ UseBigObj ? COFF::Symbol32Size : COFF::Symbol16Size));
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);
+ WriteLE16(static_cast<int16_t>(i->Aux.SectionDefinition.Number));
Write8(i->Aux.SectionDefinition.Selection);
WriteZeros(sizeof(i->Aux.SectionDefinition.unused));
+ WriteLE16(static_cast<int16_t>(i->Aux.SectionDefinition.Number >> 16));
+ if (UseBigObj)
+ WriteZeros(COFF::Symbol32Size - COFF::Symbol16Size);
break;
}
}
const MCAsmLayout &Layout) {
// "Define" each section & symbol. This creates section & symbol
// entries in the staging area.
+ for (const auto & Section : Asm)
+ DefineSection(Section);
- 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);
- }
+ for (MCSymbolData &SD : Asm.symbols())
+ if (ExportSymbol(SD.getSymbol(), Asm))
+ DefineSymbol(SD, Asm, Layout);
}
void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
const MCFragment *Fragment,
const MCFixup &Fixup,
MCValue Target,
+ bool &IsPCRel,
uint64_t &FixedValue) {
- assert(Target.getSymA() != NULL && "Relocation must reference a symbol!");
+ assert(Target.getSymA() && "Relocation must reference a symbol!");
+
+ const MCSymbol &Symbol = Target.getSymA()->getSymbol();
+ const MCSymbol &A = Symbol.AliasedSymbol();
+ if (!Asm.hasSymbolData(A))
+ Asm.getContext().FatalError(
+ Fixup.getLoc(),
+ Twine("symbol '") + A.getName() + "' can not be undefined");
- const MCSymbol *A = &Target.getSymA()->getSymbol();
- MCSymbolData &A_SD = Asm.getSymbolData(*A);
+ const MCSymbolData &A_SD = Asm.getSymbolData(A);
MCSectionData const *SectionData = Fragment->getParent();
COFFSection *coff_section = SectionMap[&SectionData->getSection()];
COFFSymbol *coff_symbol = SymbolMap[&A_SD.getSymbol()];
+ const MCSymbolRefExpr *SymB = Target.getSymB();
+ bool CrossSection = false;
- if (Target.getSymB()) {
- if (&Target.getSymA()->getSymbol().getSection()
- != &Target.getSymB()->getSymbol().getSection()) {
- llvm_unreachable("Symbol relative relocations are only allowed between "
- "symbols in the same section");
- }
- const MCSymbol *B = &Target.getSymB()->getSymbol();
- MCSymbolData &B_SD = Asm.getSymbolData(*B);
+ if (SymB) {
+ const MCSymbol *B = &SymB->getSymbol();
+ const MCSymbolData &B_SD = Asm.getSymbolData(*B);
+ if (!B_SD.getFragment())
+ Asm.getContext().FatalError(
+ Fixup.getLoc(),
+ Twine("symbol '") + B->getName() +
+ "' can not be undefined in a subtraction expression");
- FixedValue = Layout.getSymbolOffset(&A_SD) - Layout.getSymbolOffset(&B_SD);
+ if (!A_SD.getFragment())
+ Asm.getContext().FatalError(
+ Fixup.getLoc(),
+ Twine("symbol '") + Symbol.getName() +
+ "' can not be undefined in a subtraction expression");
+ CrossSection = &Symbol.getSection() != &B->getSection();
+
+ // 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.
- return;
+ if (!CrossSection)
+ return;
} else {
FixedValue = Target.getConstant();
}
Reloc.Data.VirtualAddress = Layout.getFragmentOffset(Fragment);
// Turn relocations for temporary symbols into section relocations.
- if (coff_symbol->MCData->getSymbol().isTemporary()) {
+ if (coff_symbol->MCData->getSymbol().isTemporary() || CrossSection) {
Reloc.Symb = coff_symbol->Section->Symbol;
FixedValue += Layout.getFragmentOffset(coff_symbol->MCData->Fragment)
+ coff_symbol->MCData->getOffset();
++Reloc.Symb->Relocations;
Reloc.Data.VirtualAddress += Fixup.getOffset();
-
- switch ((unsigned)Fixup.getKind()) {
- 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?
+ Reloc.Data.Type = TargetObjectWriter->getRelocType(Target, Fixup,
+ CrossSection);
+
+ // FIXME: Can anyone explain what this does other than adjust for the size
+ // of the offset?
+ if ((Header.Machine == COFF::IMAGE_FILE_MACHINE_AMD64 &&
+ Reloc.Data.Type == COFF::IMAGE_REL_AMD64_REL32) ||
+ (Header.Machine == COFF::IMAGE_FILE_MACHINE_I386 &&
+ Reloc.Data.Type == COFF::IMAGE_REL_I386_REL32))
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);
-}
-bool WinCOFFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm,
- const MCValue Target,
- bool IsPCRel,
- const MCFragment *DF) const {
- // If this is a PCrel relocation, find the section this fixup value is
- // relative to.
- const MCSection *BaseSection = 0;
- if (IsPCRel) {
- BaseSection = &DF->getParent()->getSection();
- assert(BaseSection);
- }
-
- const MCSection *SectionA = 0;
- const MCSymbol *SymbolA = 0;
- if (const MCSymbolRefExpr *A = Target.getSymA()) {
- SymbolA = &A->getSymbol();
- SectionA = &SymbolA->getSection();
- }
-
- const MCSection *SectionB = 0;
- if (const MCSymbolRefExpr *B = Target.getSymB()) {
- SectionB = &B->getSymbol().getSection();
+ if (Header.Machine == COFF::IMAGE_FILE_MACHINE_ARMNT) {
+ switch (Reloc.Data.Type) {
+ case COFF::IMAGE_REL_ARM_ABSOLUTE:
+ case COFF::IMAGE_REL_ARM_ADDR32:
+ case COFF::IMAGE_REL_ARM_ADDR32NB:
+ case COFF::IMAGE_REL_ARM_TOKEN:
+ case COFF::IMAGE_REL_ARM_SECTION:
+ case COFF::IMAGE_REL_ARM_SECREL:
+ break;
+ case COFF::IMAGE_REL_ARM_BRANCH11:
+ case COFF::IMAGE_REL_ARM_BLX11:
+ // IMAGE_REL_ARM_BRANCH11 and IMAGE_REL_ARM_BLX11 are only used for
+ // pre-ARMv7, which implicitly rules it out of ARMNT (it would be valid
+ // for Windows CE).
+ case COFF::IMAGE_REL_ARM_BRANCH24:
+ case COFF::IMAGE_REL_ARM_BLX24:
+ case COFF::IMAGE_REL_ARM_MOV32A:
+ // IMAGE_REL_ARM_BRANCH24, IMAGE_REL_ARM_BLX24, IMAGE_REL_ARM_MOV32A are
+ // only used for ARM mode code, which is documented as being unsupported
+ // by Windows on ARM. Empirical proof indicates that masm is able to
+ // generate the relocations however the rest of the MSVC toolchain is
+ // unable to handle it.
+ llvm_unreachable("unsupported relocation");
+ break;
+ case COFF::IMAGE_REL_ARM_MOV32T:
+ break;
+ case COFF::IMAGE_REL_ARM_BRANCH20T:
+ case COFF::IMAGE_REL_ARM_BRANCH24T:
+ case COFF::IMAGE_REL_ARM_BLX23T:
+ // IMAGE_REL_BRANCH20T, IMAGE_REL_ARM_BRANCH24T, IMAGE_REL_ARM_BLX23T all
+ // perform a 4 byte adjustment to the relocation. Relative branches are
+ // offset by 4 on ARM, however, because there is no RELA relocations, all
+ // branches are offset by 4.
+ FixedValue = FixedValue + 4;
+ break;
+ }
}
- if (!BaseSection)
- return SectionA == SectionB;
-
- return !SectionB && BaseSection == SectionA;
+ if (TargetObjectWriter->recordRelocation(Fixup))
+ coff_section->Relocations.push_back(Reloc);
}
void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
const MCAsmLayout &Layout) {
+ size_t SectionsSize = Sections.size();
+ if (SectionsSize > static_cast<size_t>(INT32_MAX))
+ report_fatal_error(
+ "PE COFF object files can't have more than 2147483647 sections");
+
// Assign symbol and section indexes and offsets.
- Header.NumberOfSections = 0;
+ int32_t NumberOfSections = static_cast<int32_t>(SectionsSize);
- 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;
- }
+ UseBigObj = NumberOfSections > COFF::MaxNumberOfSections16;
+
+ DenseMap<COFFSection *, int32_t> SectionIndices(
+ NextPowerOf2(NumberOfSections));
+ size_t Number = 1;
+ for (const auto &Section : Sections) {
+ SectionIndices[Section.get()] = Number;
+ MakeSectionReal(*Section, Number);
+ ++Number;
}
+ Header.NumberOfSections = NumberOfSections;
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);
+ for (auto FI = Asm.file_names_begin(), FE = Asm.file_names_end();
+ FI != FE; ++FI) {
+ // round up to calculate the number of auxiliary symbols required
+ unsigned SymbolSize = UseBigObj ? COFF::Symbol32Size : COFF::Symbol16Size;
+ unsigned Count = (FI->size() + SymbolSize - 1) / SymbolSize;
+
+ COFFSymbol *file = createSymbol(".file");
+ file->Data.SectionNumber = COFF::IMAGE_SYM_DEBUG;
+ file->Data.StorageClass = COFF::IMAGE_SYM_CLASS_FILE;
+ file->Aux.resize(Count);
+
+ unsigned Offset = 0;
+ unsigned Length = FI->size();
+ for (auto & Aux : file->Aux) {
+ Aux.AuxType = ATFile;
+
+ if (Length > SymbolSize) {
+ memcpy(&Aux.Aux, FI->c_str() + Offset, SymbolSize);
+ Length = Length - SymbolSize;
+ } else {
+ memcpy(&Aux.Aux, FI->c_str() + Offset, Length);
+ memset((char *)&Aux.Aux + Length, 0, SymbolSize - Length);
+ break;
+ }
- coff_symbol->Data.SectionNumber = coff_symbol->Section->Number;
- coff_symbol->Data.Value = Layout.getFragmentOffset(SymbolData->Fragment)
- + SymbolData->Offset;
+ Offset += SymbolSize;
}
+ }
- if (coff_symbol->should_keep()) {
- MakeSymbolReal(*coff_symbol, Header.NumberOfSymbols++);
+ for (auto &Symbol : Symbols) {
+ // Update section number & offset for symbols that have them.
+ if (Symbol->Section)
+ Symbol->Data.SectionNumber = Symbol->Section->Number;
+
+ if (Symbol->should_keep()) {
+ MakeSymbolReal(*Symbol, Header.NumberOfSymbols++);
// Update auxiliary symbol info.
- coff_symbol->Data.NumberOfAuxSymbols = coff_symbol->Aux.size();
- Header.NumberOfSymbols += coff_symbol->Data.NumberOfAuxSymbols;
+ Symbol->Data.NumberOfAuxSymbols = Symbol->Aux.size();
+ Header.NumberOfSymbols += Symbol->Data.NumberOfAuxSymbols;
} else
- coff_symbol->Index = -1;
+ 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 &&
+ for (auto & Symbol : Symbols) {
+ if (Symbol->Other) {
+ assert(Symbol->Index != -1);
+ assert(Symbol->Aux.size() == 1 && "Symbol must contain one aux symbol!");
+ assert(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;
+ Symbol->Aux[0].Aux.WeakExternal.TagIndex = Symbol->Other->Index;
}
}
+ // Fixup associative COMDAT sections.
+ for (auto & Section : Sections) {
+ if (Section->Symbol->Aux[0].Aux.SectionDefinition.Selection !=
+ COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
+ continue;
+
+ const MCSectionCOFF &MCSec =
+ static_cast<const MCSectionCOFF &>(Section->MCData->getSection());
+
+ const MCSymbol *COMDAT = MCSec.getCOMDATSymbol();
+ assert(COMDAT);
+ COFFSymbol *COMDATSymbol = GetOrCreateCOFFSymbol(COMDAT);
+ assert(COMDATSymbol);
+ COFFSection *Assoc = COMDATSymbol->Section;
+ if (!Assoc)
+ report_fatal_error(
+ Twine("Missing associated COMDAT section for section ") +
+ MCSec.getSectionName());
+
+ // Skip this section if the associated section is unused.
+ if (Assoc->Number == -1)
+ continue;
+
+ Section->Symbol->Aux[0].Aux.SectionDefinition.Number = SectionIndices[Assoc];
+ }
+
+
// Assign file offsets to COFF object file structures.
unsigned offset = 0;
- offset += COFF::HeaderSize;
+ if (UseBigObj)
+ offset += COFF::Header32Size;
+ else
+ offset += COFF::Header16Size;
offset += COFF::SectionSize * Header.NumberOfSections;
- for (MCAssembler::const_iterator i = Asm.begin(),
- e = Asm.end();
- i != e; i++) {
- COFFSection *Sec = SectionMap[&i->getSection()];
+ for (const auto & Section : Asm) {
+ COFFSection *Sec = SectionMap[&Section.getSection()];
if (Sec->Number == -1)
continue;
- Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(i);
+ Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(&Section);
if (IsPhysicalSection(Sec)) {
Sec->Header.PointerToRawData = offset;
}
if (Sec->Relocations.size() > 0) {
- Sec->Header.NumberOfRelocations = Sec->Relocations.size();
+ bool RelocationsOverflow = Sec->Relocations.size() >= 0xffff;
+
+ if (RelocationsOverflow) {
+ // Signal overflow by setting NumberOfRelocations to max value. Actual
+ // size is found in reloc #0. Microsoft tools understand this.
+ Sec->Header.NumberOfRelocations = 0xffff;
+ } else {
+ Sec->Header.NumberOfRelocations = Sec->Relocations.size();
+ }
Sec->Header.PointerToRelocations = offset;
+ if (RelocationsOverflow) {
+ // Reloc #0 will contain actual count, so make room for it.
+ offset += COFF::RelocationSize;
+ }
+
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;
+ for (auto & Relocation : Sec->Relocations) {
+ assert(Relocation.Symb->Index != -1);
+ Relocation.Data.SymbolTableIndex = Relocation.Symb->Index;
}
}
- assert(Sec->Symbol->Aux.size() == 1
- && "Section's symbol must have one aux!");
+ 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!");
Header.PointerToSymbolTable = offset;
- Header.TimeDateStamp = sys::TimeValue::now().toEpochTime();
+ // We want a deterministic output. It looks like GNU as also writes 0 in here.
+ Header.TimeDateStamp = 0;
// 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 (auto & Section : Sections) {
+ if (Section->Number != -1) {
+ if (Section->Relocations.size() >= 0xffff)
+ Section->Header.Characteristics |= COFF::IMAGE_SCN_LNK_NRELOC_OVFL;
+ WriteSectionHeader(Section->Header);
+ }
+ }
for (i = Sections.begin(), ie = Sections.end(),
j = Asm.begin(), je = Asm.end();
assert(OS.tell() == (*i)->Header.PointerToRawData &&
"Section::PointerToRawData is insane!");
- Asm.WriteSectionData(j, Layout);
+ 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);
+ if ((*i)->Relocations.size() >= 0xffff) {
+ // In case of overflow, write actual relocation count as first
+ // relocation. Including the synthetic reloc itself (+ 1).
+ COFF::relocation r;
+ r.VirtualAddress = (*i)->Relocations.size() + 1;
+ r.SymbolTableIndex = 0;
+ r.Type = 0;
+ WriteRelocation(r);
}
+
+ for (const auto & Relocation : (*i)->Relocations)
+ WriteRelocation(Relocation.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);
+ for (auto & Symbol : Symbols)
+ if (Symbol->Index != -1)
+ WriteSymbol(*Symbol);
OS.write((char const *)&Strings.Data.front(), Strings.Data.size());
}
+MCWinCOFFObjectTargetWriter::MCWinCOFFObjectTargetWriter(unsigned Machine_) :
+ Machine(Machine_) {
+}
+
+// Pin the vtable to this file.
+void MCWinCOFFObjectTargetWriter::anchor() {}
+
//------------------------------------------------------------------------------
// WinCOFFObjectWriter factory function
namespace llvm {
- MCObjectWriter *createWinCOFFObjectWriter(raw_ostream &OS, bool is64Bit) {
- return new WinCOFFObjectWriter(OS, is64Bit);
+ MCObjectWriter *createWinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW,
+ raw_ostream &OS) {
+ return new WinCOFFObjectWriter(MOTW, OS);
}
}
projects / oota-llvm.git / blobdiff