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Diffstat (limited to 'llvm/lib/MC/WinCOFFObjectWriter.cpp')
-rw-r--r--llvm/lib/MC/WinCOFFObjectWriter.cpp150
1 files changed, 91 insertions, 59 deletions
diff --git a/llvm/lib/MC/WinCOFFObjectWriter.cpp b/llvm/lib/MC/WinCOFFObjectWriter.cpp
index d382037e31a..90233c7c1a0 100644
--- a/llvm/lib/MC/WinCOFFObjectWriter.cpp
+++ b/llvm/lib/MC/WinCOFFObjectWriter.cpp
@@ -71,7 +71,6 @@ public:
MCSymbolData const *MCData;
COFFSymbol(StringRef name);
- size_t size() const;
void set_name_offset(uint32_t Offset);
bool should_keep() const;
@@ -137,6 +136,8 @@ public:
section_map SectionMap;
symbol_map SymbolMap;
+ bool UseBigObj;
+
WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW, raw_ostream &OS);
COFFSymbol *createSymbol(StringRef Name);
@@ -199,10 +200,6 @@ COFFSymbol::COFFSymbol(StringRef name)
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.
@@ -301,8 +298,7 @@ size_t StringTable::insert(StringRef String) {
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();
@@ -578,19 +574,39 @@ 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);
+ WriteZeros(sizeof(COFF::BigObjHeader::unused1));
+ WriteZeros(sizeof(COFF::BigObjHeader::unused2));
+ WriteZeros(sizeof(COFF::BigObjHeader::unused3));
+ WriteZeros(sizeof(COFF::BigObjHeader::unused4));
+ 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);
@@ -608,6 +624,8 @@ 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));
@@ -615,24 +633,32 @@ void WinCOFFObjectWriter::WriteAuxiliarySymbols(
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;
}
}
@@ -665,37 +691,6 @@ void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
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);
@@ -839,23 +834,57 @@ void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
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.
- size_t NumberOfSections = 0;
+ int32_t NumberOfSections = static_cast<int32_t>(SectionsSize);
+
+ UseBigObj = NumberOfSections > COFF::MaxNumberOfSections16;
- DenseMap<COFFSection *, uint16_t> SectionIndices;
+ DenseMap<COFFSection *, int32_t> SectionIndices(
+ NextPowerOf2(NumberOfSections));
+ size_t Number = 1;
for (const auto &Section : Sections) {
- size_t Number = ++NumberOfSections;
- SectionIndices[Section.get()] = static_cast<uint16_t>(Number);
+ SectionIndices[Section.get()] = Number;
MakeSectionReal(*Section, Number);
+ ++Number;
}
- if (NumberOfSections > static_cast<size_t>(COFF::MaxNumberOfSections16))
- report_fatal_error(
- "PE COFF object files can't have more than 65,299 sections");
-
- Header.NumberOfSections = static_cast<uint16_t>(NumberOfSections);
+ Header.NumberOfSections = NumberOfSections;
Header.NumberOfSymbols = 0;
+ 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)
@@ -913,7 +942,10 @@ void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
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) {
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