#include "llvm/MC/MCValue.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 <cstdio>
MCSymbolData const *MCData;
COFFSymbol(StringRef name);
- size_t size() const;
void set_name_offset(uint32_t Offset);
bool should_keep() const;
StringTable();
size_t size() const;
size_t insert(StringRef String);
+ void clear() {
+ Map.clear();
+ Data.resize(4);
+ update_length();
+ }
};
class WinCOFFObjectWriter : public MCObjectWriter {
section_map SectionMap;
symbol_map SymbolMap;
+ 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);
void MakeSymbolReal(COFFSymbol &S, size_t Index);
void MakeSectionReal(COFFSection &S, size_t Number);
- bool ExportSymbol(MCSymbolData const &SymbolData, MCAssembler &Asm);
+ bool ExportSymbol(const MCSymbol &Symbol, MCAssembler &Asm);
bool IsPhysicalSection(COFFSection *S);
};
}
-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_uint32_le(void *Data, uint32_t Value) {
+ support::endian::write<uint32_t, support::little, support::unaligned>(Data,
+ Value);
}
//------------------------------------------------------------------------------
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.
WinCOFFObjectWriter::WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW,
raw_ostream &OS)
- : MCObjectWriter(OS, true)
- , TargetObjectWriter(MOTW) {
+ : MCObjectWriter(OS, true), TargetObjectWriter(MOTW) {
memset(&Header, 0, sizeof(Header));
Header.Machine = TargetObjectWriter->getMachine();
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;
// If no storage class was specified in the streamer, define it here.
if (coff_symbol->Data.StorageClass == 0) {
- bool external = ResSymData.isExternal() || !ResSymData.Fragment;
+ bool IsExternal =
+ ResSymData.isExternal() ||
+ (!ResSymData.getFragment() && !ResSymData.getSymbol().isVariable());
- coff_symbol->Data.StorageClass =
- external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
+ coff_symbol->Data.StorageClass = IsExternal
+ ? 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)
- coff_symbol->Section =
+ if (BaseData.Fragment) {
+ COFFSection *Sec =
SectionMap[&BaseData.Fragment->getParent()->getSection()];
+
+ if (coff_symbol->Section && coff_symbol->Section != Sec)
+ report_fatal_error("conflicting sections for symbol");
+
+ coff_symbol->Section = Sec;
+ }
}
coff_symbol->MCData = &ResSymData;
S.Index = Index;
}
-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);
+ 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);
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.
-
- static_assert(sizeof(((COFF::AuxiliaryFile *)nullptr)->FileName) == COFF::SymbolSize,
- "size mismatch for COFF::AuxiliaryFile::FileName");
- 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 Count = (FI->size() + COFF::SymbolSize - 1) / COFF::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 > COFF::SymbolSize) {
- memcpy(Aux.Aux.File.FileName, FI->c_str() + Offset, COFF::SymbolSize);
- Length = Length - COFF::SymbolSize;
- } else {
- memcpy(Aux.Aux.File.FileName, FI->c_str() + Offset, Length);
- memset(&Aux.Aux.File.FileName[Length], 0, COFF::SymbolSize - Length);
- Length = 0;
- }
-
- Offset = Offset + COFF::SymbolSize;
- }
- }
-
for (const auto & Section : Asm)
DefineSection(Section);
for (MCSymbolData &SD : Asm.symbols())
- if (ExportSymbol(SD, Asm))
+ if (ExportSymbol(SD.getSymbol(), Asm))
DefineSymbol(SD, Asm, Layout);
}
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);
- DenseMap<COFFSection *, uint16_t> SectionIndices;
- for (auto & Section : Sections) {
- if (Layout.getSectionAddressSize(Section->MCData) > 0) {
- size_t Number = ++Header.NumberOfSections;
- SectionIndices[Section.get()] = Number;
- MakeSectionReal(*Section, Number);
- } else {
- Section->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 (auto & Symbol : Symbols) {
+ 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;
+ }
+
+ Offset += SymbolSize;
+ }
+ }
+
+ for (auto &Symbol : Symbols) {
// Update section number & offset for symbols that have them.
if (Symbol->Section)
Symbol->Data.SectionNumber = Symbol->Section->Number;
const MCSectionCOFF &MCSec =
static_cast<const MCSectionCOFF &>(Section->MCData->getSection());
- COFFSection *Assoc = SectionMap.lookup(MCSec.getAssocSection());
+ 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 ") +
- MCSec.getAssocSection()->getSectionName() +
- " for section " + MCSec.getSectionName());
+ 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)
unsigned offset = 0;
- offset += COFF::HeaderSize;
+ if (UseBigObj)
+ offset += COFF::Header32Size;
+ else
+ offset += COFF::Header16Size;
offset += COFF::SectionSize * Header.NumberOfSections;
for (const auto & Section : Asm) {
bool RelocationsOverflow = Sec->Relocations.size() >= 0xffff;
if (RelocationsOverflow) {
- // Signal overflow by setting NumberOfSections to max value. Actual
+ // Signal overflow by setting NumberOfRelocations to max value. Actual
// size is found in reloc #0. Microsoft tools understand this.
Sec->Header.NumberOfRelocations = 0xffff;
} else {
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