//
//===----------------------------------------------------------------------===//
-#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/MC/MCWinCOFFObjectWriter.h"
#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.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/MCObjectFileInfo.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCSymbolCOFF.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/MC/StringTableBuilder.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>
using namespace llvm;
+#define DEBUG_TYPE "WinCOFFObjectWriter"
+
namespace {
-typedef llvm::SmallString<COFF::NameSize> name;
+typedef SmallString<COFF::NameSize> name;
enum AuxiliaryType {
ATFunctionDefinition,
};
struct AuxSymbol {
- AuxiliaryType AuxType;
+ AuxiliaryType AuxType;
COFF::Auxiliary Aux;
};
+class COFFSymbol;
+class COFFSection;
+
class COFFSymbol {
public:
COFF::symbol Data;
- typedef
llvm::SmallVector<AuxSymbol, 1> AuxiliarySymbols;
+ typedef SmallVector<AuxSymbol, 1> AuxiliarySymbols;
- name Name;
- size_t Index;
+ name Name;
+ int Index;
AuxiliarySymbols Aux;
- COFFSymbol *Other;
+ COFFSymbol *Other;
+ COFFSection *Section;
+ int Relocations;
- MCSymbolData const *MCData;
+ const MCSymbol *MC;
- COFFSymbol(llvm::StringRef name, size_t index);
- size_t size() const;
+ COFFSymbol(StringRef name);
void set_name_offset(uint32_t Offset);
+
+ bool should_keep() const;
+
+ int64_t getIndex() const { return Index; }
+ void setIndex(int Value) {
+ Index = Value;
+ if (MC)
+ MC->setIndex(static_cast<uint32_t>(Value));
+ }
};
// This class contains staging data for a COFF relocation entry.
struct COFFRelocation {
COFF::relocation Data;
- COFFSymbol *Symb;
+ COFFSymbol *Symb;
- COFFRelocation() : Symb(NULL) {}
+ COFFRelocation() : Symb(nullptr) {}
static size_t size() { return COFF::RelocationSize; }
};
public:
COFF::section Header;
- std::string Name;
- size_t Number;
- MCSectionData const *MCData;
- COFFSymbol *Symb;
- relocations Relocations;
+ std::string Name;
+ int Number;
+ MCSectionCOFF const *MCSection;
+ COFFSymbol *Symbol;
+ relocations Relocations;
- COFFSection(llvm::StringRef name, size_t Index);
+ COFFSection(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<std::unique_ptr<COFFSymbol>> symbols;
+ typedef std::vector<std::unique_ptr<COFFSection>> sections;
- typedef std::vector<COFFSymbol*> symbols;
- typedef std::vector<COFFSection*> sections;
-
- typedef StringMap<COFFSymbol *> name_symbol_map;
- typedef StringMap<COFFSection *> name_section_map;
+ typedef DenseMap<MCSymbol const *, COFFSymbol *> symbol_map;
+ typedef DenseMap<MCSection const *, COFFSection *> section_map;
- typedef DenseMap<MCSymbolData const *, COFFSymbol *> symbol_map;
- typedef DenseMap<MCSectionData const *, COFFSection *> section_map;
+ std::unique_ptr<MCWinCOFFObjectTargetWriter> TargetObjectWriter;
// Root level file contents.
COFF::header Header;
- sections Sections;
- symbols Symbols;
- StringTable Strings;
+ sections Sections;
+ symbols Symbols;
+ StringTableBuilder Strings;
// Maps used during object file creation.
section_map SectionMap;
- symbol_map SymbolMap;
+ symbol_map SymbolMap;
- WinCOFFObjectWriter(raw_ostream &OS);
+ bool UseBigObj;
- COFFSymbol *createSymbol(llvm::StringRef Name);
- COFFSection *createSection(llvm::StringRef Name);
+ WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW, raw_pwrite_stream &OS);
- void InitCOFFEntity(COFFSymbol &Symbol);
- void InitCOFFEntity(COFFSection &Section);
+ 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(MCSectionCOFF const &Sec);
+ void DefineSymbol(const MCSymbol &Symbol, MCAssembler &Assembler,
+ const MCAsmLayout &Layout);
- void DefineSection(MCSectionData const &SectionData);
- void DefineSymbol(MCSymbolData const &SymbolData, MCAssembler &Assembler);
+ void SetSymbolName(COFFSymbol &S);
+ void SetSectionName(COFFSection &S);
- bool ExportSection(COFFSection *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 writeSectionHeader(const COFF::section &S);
void WriteRelocation(const COFF::relocation &R);
// MCObjectWriter interface implementation.
- void ExecutePostLayoutBinding(MCAssembler &Asm);
+ void executePostLayoutBinding(MCAssembler &Asm,
+ const MCAsmLayout &Layout) override;
- void RecordRelocation(const MCAssembler &Asm,
- const MCAsmLayout &Layout,
- const MCFragment *Fragment,
- const MCFixup &Fixup,
- MCValue Target,
- uint64_t &FixedValue);
+ bool isSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
+ const MCSymbol &SymA,
+ const MCFragment &FB, bool InSet,
+ bool IsPCRel) const override;
- void WriteObject(const MCAssembler &Asm, const MCAsmLayout &Layout);
-};
-}
+ bool isWeak(const MCSymbol &Sym) const 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;
-}
+ void recordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCFragment *Fragment, const MCFixup &Fixup,
+ MCValue Target, bool &IsPCRel,
+ uint64_t &FixedValue) override;
-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;
+ void writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
+};
}
-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, size_t index)
- : Name(name.begin(), name.end()), Index(-1)
- , Other(NULL), MCData(NULL) {
+COFFSymbol::COFFSymbol(StringRef name)
+ : Name(name.begin(), name.end()), Other(nullptr), Section(nullptr),
+ Relocations(0), MC(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.
write_uint32_le(Data.Name + 4, Offset);
}
-//------------------------------------------------------------------------------
-// Section class implementation
+/// 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)
+ return true;
-COFFSection::COFFSection(llvm::StringRef name, size_t Index)
- : Name(name), Number(Index + 1)
- , MCData(NULL), Symb(NULL) {
- memset(&Header, 0, sizeof(Header));
-}
+ // if it has relocations pointing at it, keep it
+ if (Relocations > 0) {
+ assert(Section->Number != -1 && "Sections with relocations must be real!");
+ return true;
+ }
-size_t COFFSection::size() {
- return COFF::SectionSize;
-}
+ // if this is a safeseh handler, keep it
+ if (MC && (cast<MCSymbolCOFF>(MC)->isSafeSEH()))
+ return true;
-//------------------------------------------------------------------------------
-// StringTable class implementation
+ // if the section its in is being droped, drop it
+ if (Section->Number == -1)
+ return false;
-/// 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());
-}
+ // if it is the section symbol, keep it
+ if (Section->Symbol == this)
+ return true;
-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);
-}
+ // if its temporary, drop it
+ if (MC && MC->isTemporary())
+ return false;
-size_t StringTable::size() const {
- return Data.size();
+ // otherwise, keep it
+ return true;
}
-/// 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();
+//------------------------------------------------------------------------------
+// Section class implementation
- return Offset;
+COFFSection::COFFSection(StringRef name)
+ : Name(name), MCSection(nullptr), Symbol(nullptr) {
+ memset(&Header, 0, sizeof(Header));
}
+size_t COFFSection::size() { return COFF::SectionSize; }
+
//------------------------------------------------------------------------------
// WinCOFFObjectWriter class implementation
-WinCOFFObjectWriter::WinCOFFObjectWriter(raw_ostream &OS)
- : MCObjectWriter(OS, true) {
+WinCOFFObjectWriter::WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW,
+ raw_pwrite_stream &OS)
+ : MCObjectWriter(OS, true), TargetObjectWriter(MOTW) {
memset(&Header, 0, sizeof(Header));
- // TODO: Move magic constant out to COFF.h
- Header.Machine = 0x14C; // x86
-}
-COFFSymbol *WinCOFFObjectWriter::createSymbol(llvm::StringRef Name) {
- return createCOFFEntity<COFFSymbol>(Name, Symbols);
+ Header.Machine = TargetObjectWriter->getMachine();
}
-COFFSection *WinCOFFObjectWriter::createSection(llvm::StringRef Name) {
- return createCOFFEntity<COFFSection>(Name, Sections);
+COFFSymbol *WinCOFFObjectWriter::createSymbol(StringRef Name) {
+ return createCOFFEntity<COFFSymbol>(Name, Symbols);
}
-/// 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());
+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;
}
-/// 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", StringTableEntry);
- } else
- memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
+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,
- list_t &List) {
- object_t *Object = new object_t(Name, List.size());
-
- InitCOFFEntity(*Object);
+object_t *WinCOFFObjectWriter::createCOFFEntity(StringRef Name, list_t &List) {
+ 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) {
- // FIXME: Not sure how to verify this (at least in a debug build).
- MCSectionCOFF const &Sec =
- static_cast<MCSectionCOFF const &>(SectionData.getSection());
-
+void WinCOFFObjectWriter::defineSection(MCSectionCOFF const &Sec) {
COFFSection *coff_section = createSection(Sec.getSectionName());
- COFFSymbol *coff_symbol = createSymbol(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->Symb = coff_symbol;
+ coff_section->Symbol = coff_symbol;
+ coff_symbol->Section = coff_section;
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;
+ switch (Sec.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;
+ coff_section->MCSection = &Sec;
+ SectionMap[&Sec] = 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());
+static uint64_t getSymbolValue(const MCSymbol &Symbol,
+ const MCAsmLayout &Layout) {
+ if (Symbol.isCommon() && Symbol.isExternal())
+ return Symbol.getCommonSize();
- coff_symbol->Data.Type = (SymbolData.getFlags() & 0x0000FFFF) >> 0;
- coff_symbol->Data.StorageClass = (SymbolData.getFlags() & 0x00FF0000) >> 16;
+ uint64_t Res;
+ if (!Layout.getSymbolOffset(Symbol, Res))
+ return 0;
- // 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);
+ return Res;
+}
- coff_symbol->Data.StorageClass =
- external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
- }
+/// This function takes a symbol data object from the assembler
+/// and creates the associated COFF symbol staging object.
+void WinCOFFObjectWriter::DefineSymbol(const MCSymbol &Symbol,
+ MCAssembler &Assembler,
+ const MCAsmLayout &Layout) {
+ COFFSymbol *coff_symbol = GetOrCreateCOFFSymbol(&Symbol);
+ SymbolMap[&Symbol] = coff_symbol;
- if (SymbolData.getFlags() & COFF::SF_WeakReference) {
+ if (cast<MCSymbolCOFF>(Symbol).isWeakExternal()) {
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];
+ if (Symbol.isVariable()) {
+ const MCSymbolRefExpr *SymRef =
+ dyn_cast<MCSymbolRefExpr>(Symbol.getVariableValue());
+
+ if (!SymRef)
+ report_fatal_error("Weak externals may only alias symbols");
+
+ coff_symbol->Other = GetOrCreateCOFFSymbol(&SymRef->getSymbol());
+ } else {
+ std::string WeakName = (".weak." + Symbol.getName() + ".default").str();
+ 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);
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;
+ COFF::IMAGE_WEAK_EXTERN_SEARCH_LIBRARY;
+
+ coff_symbol->MC = &Symbol;
+ } else {
+ const MCSymbol *Base = Layout.getBaseSymbol(Symbol);
+ coff_symbol->Data.Value = getSymbolValue(Symbol, Layout);
+
+ const MCSymbolCOFF &SymbolCOFF = cast<MCSymbolCOFF>(Symbol);
+ coff_symbol->Data.Type = SymbolCOFF.getType();
+ coff_symbol->Data.StorageClass = SymbolCOFF.getClass();
+
+ // If no storage class was specified in the streamer, define it here.
+ if (coff_symbol->Data.StorageClass == COFF::IMAGE_SYM_CLASS_NULL) {
+ bool IsExternal = Symbol.isExternal() ||
+ (!Symbol.getFragment() && !Symbol.isVariable());
+
+ 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 {
+ if (Base->getFragment()) {
+ COFFSection *Sec = SectionMap[Base->getFragment()->getParent()];
+
+ if (coff_symbol->Section && coff_symbol->Section != Sec)
+ report_fatal_error("conflicting sections for symbol");
+
+ coff_symbol->Section = Sec;
+ }
+ }
+
+ coff_symbol->MC = &Symbol;
}
+}
- // Bind internal COFF symbol to MC symbol.
- coff_symbol->MCData = &SymbolData;
- SymbolMap[&SymbolData] = coff_symbol;
+// 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];
+ }
+}
+
+void WinCOFFObjectWriter::SetSectionName(COFFSection &S) {
+ if (S.Name.size() > COFF::NameSize) {
+ uint64_t StringTableEntry = Strings.getOffset(S.Name);
+
+ 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());
}
-bool WinCOFFObjectWriter::ExportSection(COFFSection *S) {
- return (S->Header.Characteristics
- & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA) == 0;
+void WinCOFFObjectWriter::SetSymbolName(COFFSymbol &S) {
+ if (S.Name.size() > COFF::NameSize)
+ S.set_name_offset(Strings.getOffset(S.Name));
+ else
+ std::memcpy(S.Data.Name, S.Name.c_str(), S.Name.size());
}
-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);
- // For now, all symbols are exported, the linker will sort it out for us.
- return true;
+ // Non-temporary labels should always be visible to the linker.
+ if (!Symbol.isTemporary())
+ return true;
+
+ // Temporary variable symbols are invisible.
+ if (Symbol.isVariable())
+ return false;
+
+ // Absolute temporary labels are never visible.
+ return !Symbol.isAbsolute();
+}
+
+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);
+ if (UseBigObj) {
+ writeLE16(COFF::IMAGE_FILE_MACHINE_UNKNOWN);
+ writeLE16(0xFFFF);
+ writeLE16(COFF::BigObjHeader::MinBigObjectVersion);
+ writeLE16(Header.Machine);
+ writeLE32(Header.TimeDateStamp);
+ writeBytes(StringRef(COFF::BigObjMagic, sizeof(COFF::BigObjMagic)));
+ 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(
- const COFFSymbol::AuxiliarySymbols &S) {
- for(COFFSymbol::AuxiliarySymbols::const_iterator i = S.begin(), e = S.end();
- i != e; ++i) {
- switch(i->AuxType) {
+ 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);
+ 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));
+ if (UseBigObj)
+ WriteZeros(COFF::Symbol32Size - COFF::Symbol16Size);
break;
case ATbfAndefSymbol:
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused1));
- WriteLE16(i->Aux.bfAndefSymbol.Linenumber);
+ writeLE16(i->Aux.bfAndefSymbol.Linenumber);
WriteZeros(sizeof(i->Aux.bfAndefSymbol.unused2));
- WriteLE32(i->Aux.bfAndefSymbol.PointerToNextFunction);
+ 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);
+ 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);
- Write8(i->Aux.SectionDefinition.Selection);
+ writeLE32(i->Aux.SectionDefinition.Length);
+ writeLE16(i->Aux.SectionDefinition.NumberOfRelocations);
+ writeLE16(i->Aux.SectionDefinition.NumberOfLinenumbers);
+ writeLE32(i->Aux.SectionDefinition.CheckSum);
+ 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;
}
}
}
-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::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);
+ writeLE32(R.VirtualAddress);
+ writeLE32(R.SymbolTableIndex);
+ writeLE16(R.Type);
}
////////////////////////////////////////////////////////////////////////////////
// MCObjectWriter interface implementations
-void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) {
+void WinCOFFObjectWriter::executePostLayoutBinding(MCAssembler &Asm,
+ const MCAsmLayout &Layout) {
// "Define" each section & symbol. This creates section & symbol
- // entries in the staging area and gives them their final indexes.
+ // entries in the staging area.
+ for (const auto &Section : Asm)
+ defineSection(static_cast<const MCSectionCOFF &>(Section));
- for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; i++)
- DefineSection(*i);
+ for (const MCSymbol &Symbol : Asm.symbols())
+ if (ExportSymbol(Symbol, Asm))
+ DefineSymbol(Symbol, Asm, Layout);
+}
- for (MCAssembler::const_symbol_iterator i = Asm.symbol_begin(),
- e = Asm.symbol_end(); i != e; i++) {
- if (ExportSymbol(*i, Asm))
- DefineSymbol(*i, Asm);
- }
+bool WinCOFFObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
+ const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB,
+ bool InSet, bool IsPCRel) const {
+ // MS LINK expects to be able to replace all references to a function with a
+ // thunk to implement their /INCREMENTAL feature. Make sure we don't optimize
+ // away any relocations to functions.
+ uint16_t Type = cast<MCSymbolCOFF>(SymA).getType();
+ if ((Type >> COFF::SCT_COMPLEX_TYPE_SHIFT) == COFF::IMAGE_SYM_DTYPE_FUNCTION)
+ return false;
+ return MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(Asm, SymA, FB,
+ InSet, IsPCRel);
}
-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!");
+bool WinCOFFObjectWriter::isWeak(const MCSymbol &Sym) const {
+ if (!Sym.isExternal())
+ return false;
+
+ if (!Sym.isInSection())
+ return false;
+
+ const auto &Sec = cast<MCSectionCOFF>(Sym.getSection());
+ if (!Sec.getCOMDATSymbol())
+ return false;
- MCSectionData const *SectionData = Fragment->getParent();
- MCSymbolData const *SymbolData =
- &Asm.getSymbolData(Target.getSymA()->getSymbol());
+ // It looks like for COFF it is invalid to replace a reference to a global
+ // in a comdat with a reference to a local.
+ // FIXME: Add a specification reference if available.
+ return true;
+}
- 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!");
+void WinCOFFObjectWriter::recordRelocation(
+ MCAssembler &Asm, const MCAsmLayout &Layout, const MCFragment *Fragment,
+ const MCFixup &Fixup, MCValue Target, bool &IsPCRel, uint64_t &FixedValue) {
+ assert(Target.getSymA() && "Relocation must reference a symbol!");
+
+ const MCSymbol &Symbol = Target.getSymA()->getSymbol();
+ const MCSymbol &A = Symbol;
+ if (!A.isRegistered())
+ Asm.getContext().reportFatalError(Fixup.getLoc(),
+ Twine("symbol '") + A.getName() +
+ "' can not be undefined");
+
+ MCSection *Section = Fragment->getParent();
+
+ // Mark this symbol as requiring an entry in the symbol table.
+ assert(SectionMap.find(Section) != SectionMap.end() &&
+ "Section must already have been defined in executePostLayoutBinding!");
+ assert(SymbolMap.find(&A) != SymbolMap.end() &&
+ "Symbol must already have been defined in executePostLayoutBinding!");
+
+ COFFSection *coff_section = SectionMap[Section];
+ COFFSymbol *coff_symbol = SymbolMap[&A];
+ const MCSymbolRefExpr *SymB = Target.getSymB();
+ bool CrossSection = false;
+
+ if (SymB) {
+ const MCSymbol *B = &SymB->getSymbol();
+ if (!B->getFragment())
+ Asm.getContext().reportFatalError(
+ Fixup.getLoc(),
+ Twine("symbol '") + B->getName() +
+ "' can not be undefined in a subtraction expression");
+
+ if (!A.getFragment())
+ Asm.getContext().reportFatalError(
+ 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 OffsetOfB = Layout.getSymbolOffset(*B);
+
+ // 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) {
+ int64_t OffsetOfA = Layout.getSymbolOffset(A);
+ FixedValue = (OffsetOfA - OffsetOfB) + Target.getConstant();
+ return;
+ }
- COFFSection *coff_section = SectionMap[SectionData];
- COFFSymbol *coff_symbol = SymbolMap[SymbolData];
+ // Offset of the relocation in the section
+ int64_t OffsetOfRelocation =
+ Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
- FixedValue = Target.getConstant();
+ FixedValue = (OffsetOfRelocation - OffsetOfB) + Target.getConstant();
+ } else {
+ FixedValue = Target.getConstant();
+ }
COFFRelocation Reloc;
+ Reloc.Data.SymbolTableIndex = 0;
Reloc.Data.VirtualAddress = Layout.getFragmentOffset(Fragment);
- Reloc.Symb = coff_symbol;
- Reloc.Data.VirtualAddress += Fixup.getOffset();
+ // Turn relocations for temporary symbols into section relocations.
+ if (coff_symbol->MC->isTemporary() || CrossSection) {
+ Reloc.Symb = coff_symbol->Section->Symbol;
+ FixedValue += Layout.getFragmentOffset(coff_symbol->MC->getFragment()) +
+ coff_symbol->MC->getOffset();
+ } else
+ Reloc.Symb = coff_symbol;
- switch (Fixup.getKind()) {
- case FirstTargetFixupKind: // reloc_pcrel_4byte
- Reloc.Data.Type = COFF::IMAGE_REL_I386_REL32;
+ ++Reloc.Symb->Relocations;
+
+ Reloc.Data.VirtualAddress += Fixup.getOffset();
+ Reloc.Data.Type = TargetObjectWriter->getRelocType(
+ Target, Fixup, CrossSection, Asm.getBackend());
+
+ // 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:
- Reloc.Data.Type = COFF::IMAGE_REL_I386_DIR32;
- break;
- default:
- llvm_unreachable("unsupported relocation type");
+
+ 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;
+ }
}
- coff_section->Relocations.push_back(Reloc);
+ if (TargetObjectWriter->recordRelocation(Fixup))
+ coff_section->Relocations.push_back(Reloc);
}
-void WinCOFFObjectWriter::WriteObject(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.
+ int32_t NumberOfSections = static_cast<int32_t>(SectionsSize);
- Header.NumberOfSymbols = 0;
+ UseBigObj = NumberOfSections > COFF::MaxNumberOfSections16;
- for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
- COFFSymbol *coff_symbol = *i;
- MCSymbolData const *SymbolData = coff_symbol->MCData;
+ // Assign section numbers.
+ size_t Number = 1;
+ for (const auto &Section : Sections) {
+ Section->Number = Number;
+ Section->Symbol->Data.SectionNumber = Number;
+ Section->Symbol->Aux[0].Aux.SectionDefinition.Number = Number;
+ ++Number;
+ }
- coff_symbol->Index = Header.NumberOfSymbols++;
+ Header.NumberOfSections = NumberOfSections;
+ Header.NumberOfSymbols = 0;
- // Update section number & offset for symbols that have them.
- if ((SymbolData != NULL) && (SymbolData->Fragment != NULL)) {
- COFFSection *coff_section = SectionMap[SymbolData->Fragment->getParent()];
+ for (const std::string &Name : Asm.getFileNames()) {
+ // round up to calculate the number of auxiliary symbols required
+ unsigned SymbolSize = UseBigObj ? COFF::Symbol32Size : COFF::Symbol16Size;
+ unsigned Count = (Name.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 = Name.size();
+ for (auto &Aux : file->Aux) {
+ Aux.AuxType = ATFile;
+
+ if (Length > SymbolSize) {
+ memcpy(&Aux.Aux, Name.c_str() + Offset, SymbolSize);
+ Length = Length - SymbolSize;
+ } else {
+ memcpy(&Aux.Aux, Name.c_str() + Offset, Length);
+ memset((char *)&Aux.Aux + Length, 0, SymbolSize - Length);
+ break;
+ }
- coff_symbol->Data.SectionNumber = coff_section->Number;
- coff_symbol->Data.Value = Layout.getFragmentOffset(SymbolData->Fragment);
+ Offset += SymbolSize;
}
+ }
- // Update auxiliary symbol info.
- coff_symbol->Data.NumberOfAuxSymbols = coff_symbol->Aux.size();
- Header.NumberOfSymbols += coff_symbol->Data.NumberOfAuxSymbols;
+ 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()) {
+ Symbol->setIndex(Header.NumberOfSymbols++);
+ // Update auxiliary symbol info.
+ Symbol->Data.NumberOfAuxSymbols = Symbol->Aux.size();
+ Header.NumberOfSymbols += Symbol->Data.NumberOfAuxSymbols;
+ } else {
+ Symbol->setIndex(-1);
+ }
}
- // Fixup weak external references.
- for (symbols::iterator i = Symbols.begin(), e = Symbols.end(); i != e; i++) {
- COFFSymbol *symb = *i;
+ // Build string table.
+ for (const auto &S : Sections)
+ if (S->Name.size() > COFF::NameSize)
+ Strings.add(S->Name);
+ for (const auto &S : Symbols)
+ if (S->should_keep() && S->Name.size() > COFF::NameSize)
+ Strings.add(S->Name);
+ Strings.finalize(StringTableBuilder::WinCOFF);
+
+ // Set names.
+ for (const auto &S : Sections)
+ SetSectionName(*S);
+ for (auto &S : Symbols)
+ if (S->should_keep())
+ SetSymbolName(*S);
- if (symb->Other != NULL) {
- assert(symb->Aux.size() == 1 &&
- "Symbol must contain one aux symbol!");
- assert(symb->Aux[0].AuxType == ATWeakExternal &&
+ // Fixup weak external references.
+ for (auto &Symbol : Symbols) {
+ if (Symbol->Other) {
+ assert(Symbol->getIndex() != -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!");
- symb->Aux[0].Aux.WeakExternal.TagIndex = symb->Other->Index;
+ Symbol->Aux[0].Aux.WeakExternal.TagIndex = Symbol->Other->getIndex();
}
}
+ // 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 = *Section->MCSection;
+
+ 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 = Assoc->Number;
+ }
+
// Assign file offsets to COFF object file structures.
unsigned offset = 0;
- offset += COFF::HeaderSize;
- offset += COFF::SectionSize * Asm.size();
+ if (UseBigObj)
+ offset += COFF::Header32Size;
+ else
+ offset += COFF::Header16Size;
+ offset += COFF::SectionSize * Header.NumberOfSections;
- Header.NumberOfSections = Sections.size();
+ for (const auto &Section : Asm) {
+ COFFSection *Sec = SectionMap[&Section];
- for (MCAssembler::const_iterator i = Asm.begin(),
- e = Asm.end();
- i != e; i++) {
- COFFSection *Sec = SectionMap[i];
+ if (Sec->Number == -1)
+ continue;
- Sec->Header.SizeOfRawData = Layout.getSectionFileSize(i);
+ Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(&Section);
- if (ExportSection(Sec)) {
+ if (IsPhysicalSection(Sec)) {
+ // Align the section data to a four byte boundary.
+ offset = RoundUpToAlignment(offset, 4);
Sec->Header.PointerToRawData = offset;
offset += Sec->Header.SizeOfRawData;
}
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++) {
- (*cr).Data.SymbolTableIndex = (*cr).Symb->Index;
+ for (auto &Relocation : Sec->Relocations) {
+ assert(Relocation.Symb->getIndex() != -1);
+ Relocation.Data.SymbolTableIndex = Relocation.Symb->getIndex();
}
}
- assert(Sec->Symb->Aux.size() == 1 && "Section's symbol must have one aux!");
- AuxSymbol &Aux = Sec->Symb->Aux[0];
+ 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;
+ Sec->Header.NumberOfRelocations;
Aux.Aux.SectionDefinition.NumberOfLinenumbers =
- Sec->Header.NumberOfLineNumbers;
+ Sec->Header.NumberOfLineNumbers;
}
Header.PointerToSymbolTable = offset;
+ // 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;
+ MCAssembler::iterator j, je;
+
+ 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();
+ (i != ie) && (j != je); ++i, ++j) {
- for (i = Sections.begin(), ie = Sections.end(); i != ie; i++)
- WriteSectionHeader((*i)->Header);
+ if ((*i)->Number == -1)
+ continue;
- 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 &&
+ assert(OS.tell() <= (*i)->Header.PointerToRawData &&
"Section::PointerToRawData is insane!");
- Asm.WriteSectionData(j, Layout, this);
+ unsigned SectionDataPadding = (*i)->Header.PointerToRawData - OS.tell();
+ assert(SectionDataPadding < 4 &&
+ "Should only need at most three bytes of padding!");
+
+ WriteZeros(SectionDataPadding);
+
+ 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++)
- WriteSymbol(*i);
+ for (auto &Symbol : Symbols)
+ if (Symbol->getIndex() != -1)
+ WriteSymbol(*Symbol);
- OS.write((char const *)&Strings.Data.front(), Strings.Data.size());
+ OS.write(Strings.data().data(), 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) {
- return new WinCOFFObjectWriter(OS);
- }
+MCObjectWriter *
+llvm::createWinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW,
+ raw_pwrite_stream &OS) {
+ return new WinCOFFObjectWriter(MOTW, OS);
}
projects / oota-llvm.git / blobdiff