#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/STLExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSymbol.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>
static size_t size();
};
-// This class holds the COFF string table.
-class StringTable {
- typedef StringMap<size_t> map;
- map Map;
-
- void update_length();
-public:
- std::vector<char> Data;
-
- StringTable();
- size_t size() const;
- size_t insert(StringRef String);
- void clear() {
- Map.clear();
- Data.resize(4);
- update_length();
- }
-};
-
class WinCOFFObjectWriter : public MCObjectWriter {
public:
COFF::header Header;
sections Sections;
symbols Symbols;
- StringTable Strings;
+ StringTableBuilder Strings;
// Maps used during object file creation.
section_map SectionMap;
void DefineSymbol(MCSymbolData const &SymbolData, MCAssembler &Assembler,
const MCAsmLayout &Layout);
- void MakeSymbolReal(COFFSymbol &S, size_t Index);
- void MakeSectionReal(COFFSection &S, size_t Number);
+ void SetSymbolName(COFFSymbol &S);
+ void SetSectionName(COFFSection &S);
bool ExportSymbol(const MCSymbol &Symbol, MCAssembler &Asm);
void ExecutePostLayoutBinding(MCAssembler &Asm,
const MCAsmLayout &Layout) override;
- void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
+ bool IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
+ const MCSymbolData &DataA,
+ const MCFragment &FB, bool InSet,
+ bool IsPCRel) const override;
+
+ bool isWeak(const MCSymbolData &SD) const override;
+
+ 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_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);
}
//------------------------------------------------------------------------------
return COFF::SectionSize;
}
-//------------------------------------------------------------------------------
-// StringTable class implementation
-
-/// Write the length of the string table into Data.
-/// The length of the string table includes uint32 length header.
-void StringTable::update_length() {
- write_uint32_le(&Data.front(), Data.size());
-}
-
-StringTable::StringTable() {
- // The string table data begins with the length of the entire string table
- // including the length header. Allocate space for this header.
- Data.resize(4);
- update_length();
-}
-
-size_t StringTable::size() const {
- return Data.size();
-}
-
-/// Add String to the table iff it is not already there.
-/// @returns the index into the string table where the string is now located.
-size_t StringTable::insert(StringRef String) {
- map::iterator i = Map.find(String);
-
- if (i != Map.end())
- return i->second;
-
- size_t Offset = Data.size();
-
- // Insert string data into string table.
- Data.insert(Data.end(), String.begin(), String.end());
- Data.push_back('\0');
-
- // Put a reference to it in the map.
- Map[String] = Offset;
-
- // Update the internal length field.
- update_length();
-
- return Offset;
-}
-
//------------------------------------------------------------------------------
// WinCOFFObjectWriter class implementation
return createCOFFEntity<COFFSymbol>(Name, Symbols);
}
-COFFSymbol *WinCOFFObjectWriter::GetOrCreateCOFFSymbol(const MCSymbol * Symbol){
+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);
+ COFFSymbol *RetSymbol =
+ createCOFFEntity<COFFSymbol>(Symbol->getName(), Symbols);
SymbolMap[Symbol] = RetSymbol;
return RetSymbol;
}
coff_symbol->Other = GetOrCreateCOFFSymbol(&SymRef->getSymbol());
} else {
- std::string WeakName = std::string(".weak.")
- + Symbol.getName().str()
- + ".default";
+ 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;
coff_symbol->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
} else {
const MCSymbolData &BaseData = Assembler.getSymbolData(*Base);
- if (BaseData.Fragment) {
+ if (BaseData.getFragment()) {
COFFSection *Sec =
- SectionMap[&BaseData.Fragment->getParent()->getSection()];
+ SectionMap[&BaseData.getFragment()->getParent()->getSection()];
if (coff_symbol->Section && coff_symbol->Section != Sec)
report_fatal_error("conflicting sections for symbol");
}
}
-/// making a section real involves assigned it a number and putting
-/// name into the string table if needed
-void WinCOFFObjectWriter::MakeSectionReal(COFFSection &S, size_t Number) {
+void WinCOFFObjectWriter::SetSectionName(COFFSection &S) {
if (S.Name.size() > COFF::NameSize) {
- uint64_t StringTableEntry = Strings.insert(S.Name.c_str());
+ uint64_t StringTableEntry = Strings.getOffset(S.Name);
if (StringTableEntry <= Max6DecimalOffset) {
std::sprintf(S.Header.Name, "/%d", unsigned(StringTableEntry));
}
} else
std::memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
-
- S.Number = Number;
- S.Symbol->Data.SectionNumber = S.Number;
- S.Symbol->Aux[0].Aux.SectionDefinition.Number = S.Number;
}
-void WinCOFFObjectWriter::MakeSymbolReal(COFFSymbol &S, size_t Index) {
- if (S.Name.size() > COFF::NameSize) {
- size_t StringTableEntry = Strings.insert(S.Name.c_str());
-
- S.set_name_offset(StringTableEntry);
- } else
+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());
- S.Index = Index;
}
bool WinCOFFObjectWriter::ExportSymbol(const MCSymbol &Symbol,
const MCAsmLayout &Layout) {
// "Define" each section & symbol. This creates section & symbol
// entries in the staging area.
- for (const auto & Section : Asm)
+ for (const auto &Section : Asm)
DefineSection(Section);
for (MCSymbolData &SD : Asm.symbols())
DefineSymbol(SD, Asm, Layout);
}
-void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
- const MCAsmLayout &Layout,
- const MCFragment *Fragment,
- const MCFixup &Fixup,
- MCValue Target,
- bool &IsPCRel,
- uint64_t &FixedValue) {
+bool WinCOFFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(
+ const MCAssembler &Asm, const MCSymbolData &DataA, 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.
+ if ((((DataA.getFlags() & COFF::SF_TypeMask) >> COFF::SF_TypeShift) >>
+ COFF::SCT_COMPLEX_TYPE_SHIFT) == COFF::IMAGE_SYM_DTYPE_FUNCTION)
+ return false;
+ return MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(Asm, DataA, FB,
+ InSet, IsPCRel);
+}
+
+bool WinCOFFObjectWriter::isWeak(const MCSymbolData &SD) const {
+ // FIXME: this is for PR23025. Write a good description on
+ // why this is needed.
+ return SD.isExternal();
+}
+
+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();
CrossSection = &Symbol.getSection() != &B->getSection();
// Offset of the symbol in the section
- int64_t a = Layout.getSymbolOffset(&B_SD);
+ int64_t OffsetOfB = Layout.getSymbolOffset(&B_SD);
- // Ofeset of the relocation in the section
- int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
-
- FixedValue = b - a;
// In the case where we have SymbA and SymB, we just need to store the delta
// between the two symbols. Update FixedValue to account for the delta, and
// skip recording the relocation.
- if (!CrossSection)
+ if (!CrossSection) {
+ int64_t OffsetOfA = Layout.getSymbolOffset(&A_SD);
+ FixedValue = (OffsetOfA - OffsetOfB) + Target.getConstant();
return;
+ }
+
+ // Offset of the relocation in the section
+ int64_t OffsetOfRelocation =
+ Layout.getFragmentOffset(Fragment) + Fixup.getOffset();
+
+ FixedValue = OffsetOfRelocation - OffsetOfB;
} else {
FixedValue = Target.getConstant();
}
// Turn relocations for temporary symbols into section relocations.
if (coff_symbol->MCData->getSymbol().isTemporary() || CrossSection) {
Reloc.Symb = coff_symbol->Section->Symbol;
- FixedValue += Layout.getFragmentOffset(coff_symbol->MCData->Fragment)
- + coff_symbol->MCData->getOffset();
+ FixedValue += Layout.getFragmentOffset(coff_symbol->MCData->getFragment()) +
+ coff_symbol->MCData->getOffset();
} else
Reloc.Symb = coff_symbol;
++Reloc.Symb->Relocations;
Reloc.Data.VirtualAddress += Fixup.getOffset();
- Reloc.Data.Type = TargetObjectWriter->getRelocType(Target, Fixup,
- CrossSection);
+ 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?
DenseMap<COFFSection *, int32_t> SectionIndices(
NextPowerOf2(NumberOfSections));
+
+ // Assign section numbers.
size_t Number = 1;
for (const auto &Section : Sections) {
SectionIndices[Section.get()] = Number;
- MakeSectionReal(*Section, Number);
+ Section->Number = Number;
+ Section->Symbol->Data.SectionNumber = Number;
+ Section->Symbol->Aux[0].Aux.SectionDefinition.Number = Number;
++Number;
}
unsigned Offset = 0;
unsigned Length = FI->size();
- for (auto & Aux : file->Aux) {
+ for (auto &Aux : file->Aux) {
Aux.AuxType = ATFile;
if (Length > SymbolSize) {
// 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++);
-
+ Symbol->Index = Header.NumberOfSymbols++;
// Update auxiliary symbol info.
Symbol->Data.NumberOfAuxSymbols = Symbol->Aux.size();
Header.NumberOfSymbols += Symbol->Data.NumberOfAuxSymbols;
Symbol->Index = -1;
}
+ // 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);
+
// Fixup weak external references.
- for (auto & Symbol : Symbols) {
+ for (auto &Symbol : Symbols) {
if (Symbol->Other) {
assert(Symbol->Index != -1);
assert(Symbol->Aux.size() == 1 && "Symbol must contain one aux symbol!");
}
// Fixup associative COMDAT sections.
- for (auto & Section : Sections) {
+ for (auto &Section : Sections) {
if (Section->Symbol->Aux[0].Aux.SectionDefinition.Selection !=
COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
continue;
offset += COFF::Header16Size;
offset += COFF::SectionSize * Header.NumberOfSections;
- for (const auto & Section : Asm) {
+ for (const auto &Section : Asm) {
COFFSection *Sec = SectionMap[&Section.getSection()];
if (Sec->Number == -1)
Sec->Header.SizeOfRawData = Layout.getSectionAddressSize(&Section);
if (IsPhysicalSection(Sec)) {
+ // Align the section data to a four byte boundary.
+ offset = RoundUpToAlignment(offset, 4);
Sec->Header.PointerToRawData = offset;
offset += Sec->Header.SizeOfRawData;
offset += COFF::RelocationSize * Sec->Relocations.size();
- for (auto & Relocation : Sec->Relocations) {
+ for (auto &Relocation : Sec->Relocations) {
assert(Relocation.Symb->Index != -1);
Relocation.Data.SymbolTableIndex = Relocation.Symb->Index;
}
sections::iterator i, ie;
MCAssembler::const_iterator j, je;
- for (auto & Section : Sections) {
+ for (auto &Section : Sections) {
if (Section->Number != -1) {
if (Section->Relocations.size() >= 0xffff)
Section->Header.Characteristics |= COFF::IMAGE_SCN_LNK_NRELOC_OVFL;
continue;
if ((*i)->Header.PointerToRawData != 0) {
- assert(OS.tell() == (*i)->Header.PointerToRawData &&
+ assert(OS.tell() <= (*i)->Header.PointerToRawData &&
"Section::PointerToRawData is insane!");
+ 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);
}
WriteRelocation(r);
}
- for (const auto & Relocation : (*i)->Relocations)
+ for (const auto &Relocation : (*i)->Relocations)
WriteRelocation(Relocation.Data);
} else
assert((*i)->Header.PointerToRelocations == 0 &&
assert(OS.tell() == Header.PointerToSymbolTable &&
"Header::PointerToSymbolTable is insane!");
- for (auto & Symbol : Symbols)
+ for (auto &Symbol : Symbols)
if (Symbol->Index != -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_) :
projects / oota-llvm.git / blobdiff