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-rw-r--r--lib/MC/ELFObjectWriter.cpp349
1 files changed, 91 insertions, 258 deletions
diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp
index c99a3ee..8cb01c4 100644
--- a/lib/MC/ELFObjectWriter.cpp
+++ b/lib/MC/ELFObjectWriter.cpp
@@ -79,17 +79,6 @@ public:
uint8_t other, uint32_t shndx, bool Reserved);
};
-struct ELFRelocationEntry {
- uint64_t Offset; // Where is the relocation.
- const MCSymbol *Symbol; // The symbol to relocate with.
- unsigned Type; // The type of the relocation.
- uint64_t Addend; // The addend to use.
-
- ELFRelocationEntry(uint64_t Offset, const MCSymbol *Symbol, unsigned Type,
- uint64_t Addend)
- : Offset(Offset), Symbol(Symbol), Type(Type), Addend(Addend) {}
-};
-
class ELFObjectWriter : public MCObjectWriter {
FragmentWriter FWriter;
@@ -103,22 +92,13 @@ class ELFObjectWriter : public MCObjectWriter {
static bool isLocal(const MCSymbolData &Data, bool isUsedInReloc);
static bool IsELFMetaDataSection(const MCSectionData &SD);
static uint64_t DataSectionSize(const MCSectionData &SD);
- static uint64_t GetSectionFileSize(const MCAsmLayout &Layout,
- const MCSectionData &SD);
static uint64_t GetSectionAddressSize(const MCAsmLayout &Layout,
const MCSectionData &SD);
- void WriteDataSectionData(MCAssembler &Asm,
- const MCAsmLayout &Layout,
- const MCSectionELF &Section);
-
- /*static bool isFixupKindX86RIPRel(unsigned Kind) {
- return Kind == X86::reloc_riprel_4byte ||
- Kind == X86::reloc_riprel_4byte_movq_load;
- }*/
+ void writeDataSectionData(MCAssembler &Asm, const MCAsmLayout &Layout,
+ const MCSectionData &SD);
- /// ELFSymbolData - Helper struct for containing some precomputed
- /// information on symbols.
+ /// Helper struct for containing some precomputed information on symbols.
struct ELFSymbolData {
MCSymbolData *SymbolData;
uint64_t StringIndex;
@@ -185,7 +165,7 @@ class ELFObjectWriter : public MCObjectWriter {
}
public:
- ELFObjectWriter(MCELFObjectTargetWriter *MOTW, raw_ostream &OS,
+ ELFObjectWriter(MCELFObjectTargetWriter *MOTW, raw_pwrite_stream &OS,
bool IsLittleEndian)
: MCObjectWriter(OS, IsLittleEndian), FWriter(IsLittleEndian),
TargetObjectWriter(MOTW), NeedsGOT(false) {}
@@ -204,7 +184,7 @@ class ELFObjectWriter : public MCObjectWriter {
MCObjectWriter::reset();
}
- virtual ~ELFObjectWriter();
+ ~ELFObjectWriter() override;
void WriteWord(uint64_t W) {
if (is64Bit())
@@ -218,7 +198,6 @@ class ELFObjectWriter : public MCObjectWriter {
}
void WriteHeader(const MCAssembler &Asm,
- uint64_t SectionDataSize,
unsigned NumberOfSections);
void WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD,
@@ -245,8 +224,6 @@ class ELFObjectWriter : public MCObjectWriter {
typedef DenseMap<const MCSectionELF*, const MCSymbol*> GroupMapTy;
// Map from a signature symbol to the group section
typedef DenseMap<const MCSymbol*, const MCSectionELF*> RevGroupMapTy;
- // Map from a section to the section with the relocations
- typedef DenseMap<const MCSectionELF*, const MCSectionELF*> RelMapTy;
// Map from a section to its offset
typedef DenseMap<const MCSectionELF*, uint64_t> SectionOffsetMapTy;
@@ -255,23 +232,18 @@ class ELFObjectWriter : public MCObjectWriter {
/// \param Asm - The assembler.
/// \param SectionIndexMap - Maps a section to its index.
/// \param RevGroupMap - Maps a signature symbol to the group section.
- /// \param NumRegularSections - Number of non-relocation sections.
void computeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout,
const SectionIndexMapTy &SectionIndexMap,
- const RevGroupMapTy &RevGroupMap,
- unsigned NumRegularSections);
+ const RevGroupMapTy &RevGroupMap);
- void computeIndexMap(MCAssembler &Asm,
- SectionIndexMapTy &SectionIndexMap,
- RelMapTy &RelMap);
+ void computeIndexMap(MCAssembler &Asm, SectionIndexMapTy &SectionIndexMap);
MCSectionData *createRelocationSection(MCAssembler &Asm,
const MCSectionData &SD);
void CompressDebugSections(MCAssembler &Asm, MCAsmLayout &Layout);
- void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout,
- const RelMapTy &RelMap);
+ void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout);
void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout,
SectionIndexMapTy &SectionIndexMap);
@@ -279,23 +251,18 @@ class ELFObjectWriter : public MCObjectWriter {
// Create the sections that show up in the symbol table. Currently
// those are the .note.GNU-stack section and the group sections.
void createIndexedSections(MCAssembler &Asm, MCAsmLayout &Layout,
- GroupMapTy &GroupMap,
- RevGroupMapTy &RevGroupMap,
- SectionIndexMapTy &SectionIndexMap,
- RelMapTy &RelMap);
+ GroupMapTy &GroupMap, RevGroupMapTy &RevGroupMap,
+ SectionIndexMapTy &SectionIndexMap);
void ExecutePostLayoutBinding(MCAssembler &Asm,
const MCAsmLayout &Layout) override;
- void writeSectionHeader(MCAssembler &Asm, const GroupMapTy &GroupMap,
+ void writeSectionHeader(ArrayRef<const MCSectionELF *> Sections,
+ MCAssembler &Asm, const GroupMapTy &GroupMap,
const MCAsmLayout &Layout,
const SectionIndexMapTy &SectionIndexMap,
- const RelMapTy &RelMap,
const SectionOffsetMapTy &SectionOffsetMap);
- void ComputeSectionOrder(MCAssembler &Asm,
- std::vector<const MCSectionELF*> &Sections);
-
void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags,
uint64_t Address, uint64_t Offset,
uint64_t Size, uint32_t Link, uint32_t Info,
@@ -308,6 +275,7 @@ class ELFObjectWriter : public MCObjectWriter {
bool
IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
const MCSymbolData &DataA,
+ const MCSymbolData *DataB,
const MCFragment &FB,
bool InSet,
bool IsPCRel) const override;
@@ -317,7 +285,6 @@ class ELFObjectWriter : public MCObjectWriter {
void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
void writeSection(MCAssembler &Asm,
const SectionIndexMapTy &SectionIndexMap,
- const RelMapTy &RelMap,
uint32_t GroupSymbolIndex,
uint64_t Offset, uint64_t Size, uint64_t Alignment,
const MCSectionELF &Section);
@@ -384,8 +351,6 @@ void SymbolTableWriter::writeSymbol(uint32_t name, uint8_t info, uint64_t value,
uint16_t Index = LargeIndex ? uint16_t(ELF::SHN_XINDEX) : shndx;
- raw_svector_ostream OS(SymtabF->getContents());
-
if (Is64Bit) {
write(*SymtabF, name); // st_name
write(*SymtabF, info); // st_info
@@ -438,7 +403,6 @@ ELFObjectWriter::~ELFObjectWriter()
// Emit the ELF header.
void ELFObjectWriter::WriteHeader(const MCAssembler &Asm,
- uint64_t SectionDataSize,
unsigned NumberOfSections) {
// ELF Header
// ----------
@@ -472,8 +436,7 @@ void ELFObjectWriter::WriteHeader(const MCAssembler &Asm,
Write32(ELF::EV_CURRENT); // e_version
WriteWord(0); // e_entry, no entry point in .o file
WriteWord(0); // e_phoff, no program header for .o
- WriteWord(SectionDataSize + (is64Bit() ? sizeof(ELF::Elf64_Ehdr) :
- sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes
+ WriteWord(0); // e_shoff = sec hdr table off in bytes
// e_flags = whatever the target wants
Write32(Asm.getELFHeaderEFlags());
@@ -628,7 +591,7 @@ void ELFObjectWriter::WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD,
if (ESize) {
int64_t Res;
- if (!ESize->EvaluateAsAbsolute(Res, Layout))
+ if (!ESize->evaluateKnownAbsolute(Res, Layout))
report_fatal_error("Size expression must be absolute.");
Size = Res;
}
@@ -969,8 +932,7 @@ bool ELFObjectWriter::isLocal(const MCSymbolData &Data, bool isUsedInReloc) {
}
void ELFObjectWriter::computeIndexMap(MCAssembler &Asm,
- SectionIndexMapTy &SectionIndexMap,
- RelMapTy &RelMap) {
+ SectionIndexMapTy &SectionIndexMap) {
unsigned Index = 1;
for (MCAssembler::iterator it = Asm.begin(),
ie = Asm.end(); it != ie; ++it) {
@@ -994,17 +956,15 @@ void ELFObjectWriter::computeIndexMap(MCAssembler &Asm,
if (MCSectionData *RelSD = createRelocationSection(Asm, SD)) {
const MCSectionELF *RelSection =
static_cast<const MCSectionELF *>(&RelSD->getSection());
- RelMap[RelSection] = &Section;
SectionIndexMap[RelSection] = Index++;
}
}
}
-void
-ELFObjectWriter::computeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout,
- const SectionIndexMapTy &SectionIndexMap,
- const RevGroupMapTy &RevGroupMap,
- unsigned NumRegularSections) {
+void ELFObjectWriter::computeSymbolTable(
+ MCAssembler &Asm, const MCAsmLayout &Layout,
+ const SectionIndexMapTy &SectionIndexMap,
+ const RevGroupMapTy &RevGroupMap) {
// FIXME: Is this the correct place to do this?
// FIXME: Why is an undefined reference to _GLOBAL_OFFSET_TABLE_ needed?
if (NeedsGOT) {
@@ -1167,15 +1127,12 @@ ELFObjectWriter::createRelocationSection(MCAssembler &Asm,
EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
unsigned Flags = 0;
- StringRef Group = "";
- if (Section.getFlags() & ELF::SHF_GROUP) {
+ if (Section.getFlags() & ELF::SHF_GROUP)
Flags = ELF::SHF_GROUP;
- Group = Section.getGroup()->getName();
- }
- const MCSectionELF *RelaSection = Ctx.getELFSection(
+ const MCSectionELF *RelaSection = Ctx.createELFRelSection(
RelaSectionName, hasRelocationAddend() ? ELF::SHT_RELA : ELF::SHT_REL,
- Flags, EntrySize, Group, true);
+ Flags, EntrySize, Section.getGroup(), &Section);
return &Asm.getOrCreateSectionData(*RelaSection);
}
@@ -1324,8 +1281,7 @@ void ELFObjectWriter::CompressDebugSections(MCAssembler &Asm,
}
}
-void ELFObjectWriter::WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout,
- const RelMapTy &RelMap) {
+void ELFObjectWriter::WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) {
for (MCAssembler::iterator it = Asm.begin(), ie = Asm.end(); it != ie; ++it) {
MCSectionData &RelSD = *it;
const MCSectionELF &RelSection =
@@ -1335,7 +1291,7 @@ void ELFObjectWriter::WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout,
if (Type != ELF::SHT_REL && Type != ELF::SHT_RELA)
continue;
- const MCSectionELF *Section = RelMap.lookup(&RelSection);
+ const MCSectionELF *Section = RelSection.getAssociatedSection();
MCSectionData &SD = Asm.getOrCreateSectionData(*Section);
RelSD.setAlignment(is64Bit() ? 8 : 4);
@@ -1362,31 +1318,14 @@ void ELFObjectWriter::WriteSecHdrEntry(uint32_t Name, uint32_t Type,
WriteWord(EntrySize); // sh_entsize
}
-// ELF doesn't require relocations to be in any order. We sort by the r_offset,
-// just to match gnu as for easier comparison. The use type is an arbitrary way
-// of making the sort deterministic.
-static int cmpRel(const ELFRelocationEntry *AP, const ELFRelocationEntry *BP) {
- const ELFRelocationEntry &A = *AP;
- const ELFRelocationEntry &B = *BP;
- if (A.Offset != B.Offset)
- return B.Offset - A.Offset;
- if (B.Type != A.Type)
- return A.Type - B.Type;
- //llvm_unreachable("ELFRelocs might be unstable!");
- return 0;
-}
-
-static void sortRelocs(const MCAssembler &Asm,
- std::vector<ELFRelocationEntry> &Relocs) {
- array_pod_sort(Relocs.begin(), Relocs.end(), cmpRel);
-}
-
void ELFObjectWriter::WriteRelocationsFragment(const MCAssembler &Asm,
MCDataFragment *F,
const MCSectionData *SD) {
std::vector<ELFRelocationEntry> &Relocs = Relocations[SD];
- sortRelocs(Asm, Relocs);
+ // Sort the relocation entries. Most targets just sort by Offset, but some
+ // (e.g., MIPS) have additional constraints.
+ TargetObjectWriter->sortRelocs(Asm, Relocs);
for (unsigned i = 0, e = Relocs.size(); i != e; ++i) {
const ELFRelocationEntry &Entry = Relocs[e - i - 1];
@@ -1473,12 +1412,9 @@ void ELFObjectWriter::CreateMetadataSections(
ShStrTabBuilder.data().end());
}
-void ELFObjectWriter::createIndexedSections(MCAssembler &Asm,
- MCAsmLayout &Layout,
- GroupMapTy &GroupMap,
- RevGroupMapTy &RevGroupMap,
- SectionIndexMapTy &SectionIndexMap,
- RelMapTy &RelMap) {
+void ELFObjectWriter::createIndexedSections(
+ MCAssembler &Asm, MCAsmLayout &Layout, GroupMapTy &GroupMap,
+ RevGroupMapTy &RevGroupMap, SectionIndexMapTy &SectionIndexMap) {
MCContext &Ctx = Asm.getContext();
// Build the groups
@@ -1502,7 +1438,7 @@ void ELFObjectWriter::createIndexedSections(MCAssembler &Asm,
GroupMap[Group] = SignatureSymbol;
}
- computeIndexMap(Asm, SectionIndexMap, RelMap);
+ computeIndexMap(Asm, SectionIndexMap);
// Add sections to the groups
for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end();
@@ -1522,7 +1458,6 @@ void ELFObjectWriter::createIndexedSections(MCAssembler &Asm,
void ELFObjectWriter::writeSection(MCAssembler &Asm,
const SectionIndexMapTy &SectionIndexMap,
- const RelMapTy &RelMap,
uint32_t GroupSymbolIndex,
uint64_t Offset, uint64_t Size,
uint64_t Alignment,
@@ -1531,16 +1466,19 @@ void ELFObjectWriter::writeSection(MCAssembler &Asm,
uint64_t sh_info = 0;
switch(Section.getType()) {
+ default:
+ // Nothing to do.
+ break;
+
case ELF::SHT_DYNAMIC:
sh_link = ShStrTabBuilder.getOffset(Section.getSectionName());
- sh_info = 0;
break;
case ELF::SHT_REL:
case ELF::SHT_RELA: {
sh_link = SymbolTableIndex;
assert(sh_link && ".symtab not found");
- const MCSectionELF *InfoSection = RelMap.find(&Section)->second;
+ const MCSectionELF *InfoSection = Section.getAssociatedSection();
sh_info = SectionIndexMap.lookup(InfoSection);
break;
}
@@ -1555,45 +1493,15 @@ void ELFObjectWriter::writeSection(MCAssembler &Asm,
sh_link = SymbolTableIndex;
break;
- case ELF::SHT_PROGBITS:
- case ELF::SHT_STRTAB:
- case ELF::SHT_NOBITS:
- case ELF::SHT_NOTE:
- case ELF::SHT_NULL:
- case ELF::SHT_ARM_ATTRIBUTES:
- case ELF::SHT_INIT_ARRAY:
- case ELF::SHT_FINI_ARRAY:
- case ELF::SHT_PREINIT_ARRAY:
- case ELF::SHT_X86_64_UNWIND:
- case ELF::SHT_MIPS_REGINFO:
- case ELF::SHT_MIPS_OPTIONS:
- case ELF::SHT_MIPS_ABIFLAGS:
- // Nothing to do.
- break;
-
case ELF::SHT_GROUP:
sh_link = SymbolTableIndex;
sh_info = GroupSymbolIndex;
break;
-
- default:
- llvm_unreachable("FIXME: sh_type value not supported!");
}
if (TargetObjectWriter->getEMachine() == ELF::EM_ARM &&
- Section.getType() == ELF::SHT_ARM_EXIDX) {
- StringRef SecName(Section.getSectionName());
- if (SecName == ".ARM.exidx") {
- sh_link = SectionIndexMap.lookup(Asm.getContext().getELFSection(
- ".text", ELF::SHT_PROGBITS, ELF::SHF_EXECINSTR | ELF::SHF_ALLOC));
- } else if (SecName.startswith(".ARM.exidx")) {
- StringRef GroupName =
- Section.getGroup() ? Section.getGroup()->getName() : "";
- sh_link = SectionIndexMap.lookup(Asm.getContext().getELFSection(
- SecName.substr(sizeof(".ARM.exidx") - 1), ELF::SHT_PROGBITS,
- ELF::SHF_EXECINSTR | ELF::SHF_ALLOC, 0, GroupName));
- }
- }
+ Section.getType() == ELF::SHT_ARM_EXIDX)
+ sh_link = SectionIndexMap.lookup(Section.getAssociatedSection());
WriteSecHdrEntry(ShStrTabBuilder.getOffset(Section.getSectionName()),
Section.getType(),
@@ -1617,13 +1525,6 @@ uint64_t ELFObjectWriter::DataSectionSize(const MCSectionData &SD) {
return Ret;
}
-uint64_t ELFObjectWriter::GetSectionFileSize(const MCAsmLayout &Layout,
- const MCSectionData &SD) {
- if (IsELFMetaDataSection(SD))
- return DataSectionSize(SD);
- return Layout.getSectionFileSize(&SD);
-}
-
uint64_t ELFObjectWriter::GetSectionAddressSize(const MCAsmLayout &Layout,
const MCSectionData &SD) {
if (IsELFMetaDataSection(SD))
@@ -1631,14 +1532,9 @@ uint64_t ELFObjectWriter::GetSectionAddressSize(const MCAsmLayout &Layout,
return Layout.getSectionAddressSize(&SD);
}
-void ELFObjectWriter::WriteDataSectionData(MCAssembler &Asm,
+void ELFObjectWriter::writeDataSectionData(MCAssembler &Asm,
const MCAsmLayout &Layout,
- const MCSectionELF &Section) {
- const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
-
- uint64_t Padding = OffsetToAlignment(OS.tell(), SD.getAlignment());
- WriteZeros(Padding);
-
+ const MCSectionData &SD) {
if (IsELFMetaDataSection(SD)) {
for (MCSectionData::const_iterator i = SD.begin(), e = SD.end(); i != e;
++i) {
@@ -1652,28 +1548,20 @@ void ELFObjectWriter::WriteDataSectionData(MCAssembler &Asm,
}
void ELFObjectWriter::writeSectionHeader(
- MCAssembler &Asm, const GroupMapTy &GroupMap, const MCAsmLayout &Layout,
- const SectionIndexMapTy &SectionIndexMap, const RelMapTy &RelMap,
+ ArrayRef<const MCSectionELF *> Sections, MCAssembler &Asm,
+ const GroupMapTy &GroupMap, const MCAsmLayout &Layout,
+ const SectionIndexMapTy &SectionIndexMap,
const SectionOffsetMapTy &SectionOffsetMap) {
- const unsigned NumSections = Asm.size() + 1;
-
- std::vector<const MCSectionELF*> Sections;
- Sections.resize(NumSections - 1);
-
- for (SectionIndexMapTy::const_iterator i=
- SectionIndexMap.begin(), e = SectionIndexMap.end(); i != e; ++i) {
- const std::pair<const MCSectionELF*, uint32_t> &p = *i;
- Sections[p.second - 1] = p.first;
- }
+ const unsigned NumSections = Asm.size();
// Null section first.
uint64_t FirstSectionSize =
- NumSections >= ELF::SHN_LORESERVE ? NumSections : 0;
+ (NumSections + 1) >= ELF::SHN_LORESERVE ? NumSections + 1 : 0;
uint32_t FirstSectionLink =
ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0;
WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0);
- for (unsigned i = 0; i < NumSections - 1; ++i) {
+ for (unsigned i = 0; i < NumSections; ++i) {
const MCSectionELF &Section = *Sections[i];
const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
uint32_t GroupSymbolIndex;
@@ -1685,39 +1573,9 @@ void ELFObjectWriter::writeSectionHeader(
uint64_t Size = GetSectionAddressSize(Layout, SD);
- writeSection(Asm, SectionIndexMap, RelMap, GroupSymbolIndex,
- SectionOffsetMap.lookup(&Section), Size,
- SD.getAlignment(), Section);
- }
-}
-
-void ELFObjectWriter::ComputeSectionOrder(MCAssembler &Asm,
- std::vector<const MCSectionELF*> &Sections) {
- for (MCAssembler::iterator it = Asm.begin(),
- ie = Asm.end(); it != ie; ++it) {
- const MCSectionELF &Section =
- static_cast<const MCSectionELF &>(it->getSection());
- if (Section.getType() == ELF::SHT_GROUP)
- Sections.push_back(&Section);
- }
-
- for (MCAssembler::iterator it = Asm.begin(),
- ie = Asm.end(); it != ie; ++it) {
- const MCSectionELF &Section =
- static_cast<const MCSectionELF &>(it->getSection());
- if (Section.getType() != ELF::SHT_GROUP &&
- Section.getType() != ELF::SHT_REL &&
- Section.getType() != ELF::SHT_RELA)
- Sections.push_back(&Section);
- }
-
- for (MCAssembler::iterator it = Asm.begin(),
- ie = Asm.end(); it != ie; ++it) {
- const MCSectionELF &Section =
- static_cast<const MCSectionELF &>(it->getSection());
- if (Section.getType() == ELF::SHT_REL ||
- Section.getType() == ELF::SHT_RELA)
- Sections.push_back(&Section);
+ writeSection(Asm, SectionIndexMap, GroupSymbolIndex,
+ SectionOffsetMap.lookup(&Section), Size, SD.getAlignment(),
+ Section);
}
}
@@ -1727,102 +1585,77 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm,
RevGroupMapTy RevGroupMap;
SectionIndexMapTy SectionIndexMap;
- unsigned NumUserSections = Asm.size();
-
CompressDebugSections(Asm, const_cast<MCAsmLayout &>(Layout));
-
- DenseMap<const MCSectionELF*, const MCSectionELF*> RelMap;
- const unsigned NumUserAndRelocSections = Asm.size();
- createIndexedSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap,
- RevGroupMap, SectionIndexMap, RelMap);
- const unsigned AllSections = Asm.size();
- const unsigned NumIndexedSections = AllSections - NumUserAndRelocSections;
-
- unsigned NumRegularSections = NumUserSections + NumIndexedSections;
+ createIndexedSections(Asm, const_cast<MCAsmLayout &>(Layout), GroupMap,
+ RevGroupMap, SectionIndexMap);
// Compute symbol table information.
- computeSymbolTable(Asm, Layout, SectionIndexMap, RevGroupMap,
- NumRegularSections);
+ computeSymbolTable(Asm, Layout, SectionIndexMap, RevGroupMap);
- WriteRelocations(Asm, const_cast<MCAsmLayout&>(Layout), RelMap);
+ WriteRelocations(Asm, const_cast<MCAsmLayout &>(Layout));
CreateMetadataSections(const_cast<MCAssembler&>(Asm),
const_cast<MCAsmLayout&>(Layout),
SectionIndexMap);
- uint64_t NaturalAlignment = is64Bit() ? 8 : 4;
- uint64_t HeaderSize = is64Bit() ? sizeof(ELF::Elf64_Ehdr) :
- sizeof(ELF::Elf32_Ehdr);
- uint64_t FileOff = HeaderSize;
-
+ unsigned NumSections = Asm.size();
std::vector<const MCSectionELF*> Sections;
- ComputeSectionOrder(Asm, Sections);
- unsigned NumSections = Sections.size();
- SectionOffsetMapTy SectionOffsetMap;
- for (unsigned i = 0; i < NumRegularSections + 1; ++i) {
- const MCSectionELF &Section = *Sections[i];
- const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
+ Sections.resize(NumSections);
- FileOff = RoundUpToAlignment(FileOff, SD.getAlignment());
-
- // Remember the offset into the file for this section.
- SectionOffsetMap[&Section] = FileOff;
+ for (auto &Pair : SectionIndexMap)
+ Sections[Pair.second - 1] = Pair.first;
- // Get the size of the section in the output file (including padding).
- FileOff += GetSectionFileSize(Layout, SD);
- }
-
- FileOff = RoundUpToAlignment(FileOff, NaturalAlignment);
-
- const unsigned SectionHeaderOffset = FileOff - HeaderSize;
+ SectionOffsetMapTy SectionOffsetMap;
- uint64_t SectionHeaderEntrySize = is64Bit() ?
- sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr);
- FileOff += (NumSections + 1) * SectionHeaderEntrySize;
+ // Write out the ELF header ...
+ WriteHeader(Asm, NumSections + 1);
- for (unsigned i = NumRegularSections + 1; i < NumSections; ++i) {
+ // ... then the sections ...
+ for (unsigned i = 0; i < NumSections; ++i) {
const MCSectionELF &Section = *Sections[i];
const MCSectionData &SD = Asm.getOrCreateSectionData(Section);
-
- FileOff = RoundUpToAlignment(FileOff, SD.getAlignment());
+ uint64_t Padding = OffsetToAlignment(OS.tell(), SD.getAlignment());
+ WriteZeros(Padding);
// Remember the offset into the file for this section.
- SectionOffsetMap[&Section] = FileOff;
+ SectionOffsetMap[&Section] = OS.tell();
- // Get the size of the section in the output file (including padding).
- FileOff += GetSectionFileSize(Layout, SD);
+ writeDataSectionData(Asm, Layout, SD);
}
- // Write out the ELF header ...
- WriteHeader(Asm, SectionHeaderOffset, NumSections + 1);
-
- // ... then the regular sections ...
- // + because of .shstrtab
- for (unsigned i = 0; i < NumRegularSections + 1; ++i)
- WriteDataSectionData(Asm, Layout, *Sections[i]);
-
+ uint64_t NaturalAlignment = is64Bit() ? 8 : 4;
uint64_t Padding = OffsetToAlignment(OS.tell(), NaturalAlignment);
WriteZeros(Padding);
+ const unsigned SectionHeaderOffset = OS.tell();
+
// ... then the section header table ...
- writeSectionHeader(Asm, GroupMap, Layout, SectionIndexMap, RelMap,
+ writeSectionHeader(Sections, Asm, GroupMap, Layout, SectionIndexMap,
SectionOffsetMap);
- // ... and then the remaining sections ...
- for (unsigned i = NumRegularSections + 1; i < NumSections; ++i)
- WriteDataSectionData(Asm, Layout, *Sections[i]);
+ if (is64Bit()) {
+ uint64_t Val = SectionHeaderOffset;
+ if (sys::IsLittleEndianHost != IsLittleEndian)
+ sys::swapByteOrder(Val);
+ OS.pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
+ offsetof(ELF::Elf64_Ehdr, e_shoff));
+ } else {
+ uint32_t Val = SectionHeaderOffset;
+ if (sys::IsLittleEndianHost != IsLittleEndian)
+ sys::swapByteOrder(Val);
+ OS.pwrite(reinterpret_cast<char *>(&Val), sizeof(Val),
+ offsetof(ELF::Elf32_Ehdr, e_shoff));
+ }
}
-bool
-ELFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
- const MCSymbolData &DataA,
- const MCFragment &FB,
- bool InSet,
- bool IsPCRel) const {
- if (::isWeak(DataA))
+bool ELFObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(
+ const MCAssembler &Asm, const MCSymbolData &DataA,
+ const MCSymbolData *DataB, const MCFragment &FB, bool InSet,
+ bool IsPCRel) const {
+ if (!InSet && (::isWeak(DataA) || (DataB && ::isWeak(*DataB))))
return false;
return MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(
- Asm, DataA, FB,InSet, IsPCRel);
+ Asm, DataA, DataB, FB, InSet, IsPCRel);
}
bool ELFObjectWriter::isWeak(const MCSymbolData &SD) const {
@@ -1830,7 +1663,7 @@ bool ELFObjectWriter::isWeak(const MCSymbolData &SD) const {
}
MCObjectWriter *llvm::createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
- raw_ostream &OS,
+ raw_pwrite_stream &OS,
bool IsLittleEndian) {
return new ELFObjectWriter(MOTW, OS, IsLittleEndian);
}
generated by cgit v1.1 at 2024-04-28 14:37:47 +0000