forked from OSchip/llvm-project
[llvm-objcopy][ELF] Implement a mutable section visitor that updates size-related fields (Size, EntrySize, Align) before layout.
Summary: Fix EntrySize, Size, and Align before doing layout calculation. As a side cleanup, this removes a dependence on sizeof(Elf_Sym) within BinaryReader, so we can untemplatize that. This unblocks a cleaner implementation of handling the -O<format> flag. See D53667 for a previous attempt. Actual implementation of the -O<format> flag will come in an upcoming commit, this is largely a NFC (although not _totally_ one, because alignment on binary input was actually wrong before). Reviewers: jakehehrlich, jhenderson, alexshap, espindola Reviewed By: jhenderson Subscribers: emaste, arichardson, llvm-commits Differential Revision: https://reviews.llvm.org/D56211 llvm-svn: 350336
This commit is contained in:
Jordan Rupprecht
parent
57fc9582f9
commit
1f82176f7d
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@ -45,7 +45,7 @@
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# CHECK-NEXT: Size:
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# CHECK-NEXT: Link: 1
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# CHECK-NEXT: Info: 1
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# CHECK-NEXT: AddressAlignment: 1
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# CHECK-NEXT: AddressAlignment: 8
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# CHECK-NEXT: EntrySize: 24
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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@ -71,7 +71,47 @@ template <class ELFT> void ELFWriter<ELFT>::writeShdr(const SectionBase &Sec) {
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Shdr.sh_entsize = Sec.EntrySize;
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}
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SectionVisitor::~SectionVisitor() {}
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template <class ELFT> void ELFSectionSizer<ELFT>::visit(Section &Sec) {}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(OwnedDataSection &Sec) {}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(StringTableSection &Sec) {}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(DynamicRelocationSection &Sec) {}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(SymbolTableSection &Sec) {
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Sec.EntrySize = sizeof(Elf_Sym);
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Sec.Size = Sec.Symbols.size() * Sec.EntrySize;
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// Align to the larget field in Elf_Sym.
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Sec.Align = sizeof(Elf_Sym::st_size);
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}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(RelocationSection &Sec) {
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Sec.EntrySize = Sec.Type == SHT_REL ? sizeof(Elf_Rel) : sizeof(Elf_Rela);
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Sec.Size = Sec.Relocations.size() * Sec.EntrySize;
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// Align to the larget field in Elf_Rel(a).
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Sec.Align =
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Sec.Type == SHT_REL ? sizeof(Elf_Rel::r_info) : sizeof(Elf_Rela::r_info);
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}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(GnuDebugLinkSection &Sec) {}
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template <class ELFT> void ELFSectionSizer<ELFT>::visit(GroupSection &Sec) {}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(SectionIndexSection &Sec) {}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(CompressedSection &Sec) {}
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template <class ELFT>
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void ELFSectionSizer<ELFT>::visit(DecompressedSection &Sec) {}
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void BinarySectionWriter::visit(const SectionIndexSection &Sec) {
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error("Cannot write symbol section index table '" + Sec.Name + "' ");
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@ -102,6 +142,8 @@ void SectionWriter::visit(const Section &Sec) {
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void Section::accept(SectionVisitor &Visitor) const { Visitor.visit(*this); }
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void Section::accept(MutableSectionVisitor &Visitor) { Visitor.visit(*this); }
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void SectionWriter::visit(const OwnedDataSection &Sec) {
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uint8_t *Buf = Out.getBufferStart() + Sec.Offset;
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llvm::copy(Sec.Data, Buf);
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@ -164,10 +206,18 @@ void DecompressedSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void DecompressedSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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void OwnedDataSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void OwnedDataSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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void BinarySectionWriter::visit(const CompressedSection &Sec) {
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error("Cannot write compressed section '" + Sec.Name + "' ");
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}
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@ -246,6 +296,10 @@ void CompressedSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void CompressedSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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void StringTableSection::addString(StringRef Name) {
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StrTabBuilder.add(Name);
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Size = StrTabBuilder.getSize();
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@ -265,6 +319,10 @@ void StringTableSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void StringTableSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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template <class ELFT>
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void ELFSectionWriter<ELFT>::visit(const SectionIndexSection &Sec) {
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uint8_t *Buf = Out.getBufferStart() + Sec.Offset;
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@ -288,6 +346,10 @@ void SectionIndexSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void SectionIndexSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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static bool isValidReservedSectionIndex(uint16_t Index, uint16_t Machine) {
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switch (Index) {
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case SHN_ABS:
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@ -470,6 +532,10 @@ void SymbolTableSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void SymbolTableSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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template <class SymTabType>
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void RelocSectionWithSymtabBase<SymTabType>::removeSectionReferences(
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const SectionBase *Sec) {
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@ -540,6 +606,10 @@ void RelocationSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void RelocationSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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void RelocationSection::removeSymbols(
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function_ref<bool(const Symbol &)> ToRemove) {
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for (const Relocation &Reloc : Relocations)
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@ -562,6 +632,10 @@ void DynamicRelocationSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void DynamicRelocationSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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void Section::removeSectionReferences(const SectionBase *Sec) {
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if (LinkSection == Sec) {
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error("Section " + LinkSection->Name +
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@ -648,6 +722,10 @@ void GnuDebugLinkSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void GnuDebugLinkSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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template <class ELFT>
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void ELFSectionWriter<ELFT>::visit(const GroupSection &Sec) {
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ELF::Elf32_Word *Buf =
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@ -661,6 +739,10 @@ void GroupSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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void GroupSection::accept(MutableSectionVisitor &Visitor) {
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Visitor.visit(*this);
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}
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// Returns true IFF a section is wholly inside the range of a segment
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static bool sectionWithinSegment(const SectionBase &Section,
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const Segment &Segment) {
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@ -700,7 +782,7 @@ static bool compareSegmentsByPAddr(const Segment *A, const Segment *B) {
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return A->Index < B->Index;
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}
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template <class ELFT> void BinaryELFBuilder<ELFT>::initFileHeader() {
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void BinaryELFBuilder::initFileHeader() {
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Obj->Flags = 0x0;
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Obj->Type = ET_REL;
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Obj->OSABI = ELFOSABI_NONE;
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@ -710,11 +792,9 @@ template <class ELFT> void BinaryELFBuilder<ELFT>::initFileHeader() {
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Obj->Version = 1;
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}
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template <class ELFT> void BinaryELFBuilder<ELFT>::initHeaderSegment() {
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Obj->ElfHdrSegment.Index = 0;
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}
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void BinaryELFBuilder::initHeaderSegment() { Obj->ElfHdrSegment.Index = 0; }
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template <class ELFT> StringTableSection *BinaryELFBuilder<ELFT>::addStrTab() {
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StringTableSection *BinaryELFBuilder::addStrTab() {
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auto &StrTab = Obj->addSection<StringTableSection>();
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StrTab.Name = ".strtab";
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@ -722,15 +802,11 @@ template <class ELFT> StringTableSection *BinaryELFBuilder<ELFT>::addStrTab() {
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return &StrTab;
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}
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template <class ELFT>
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SymbolTableSection *
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BinaryELFBuilder<ELFT>::addSymTab(StringTableSection *StrTab) {
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SymbolTableSection *BinaryELFBuilder::addSymTab(StringTableSection *StrTab) {
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auto &SymTab = Obj->addSection<SymbolTableSection>();
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SymTab.Name = ".symtab";
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SymTab.Link = StrTab->Index;
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// TODO: Factor out dependence on ElfType here.
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SymTab.EntrySize = sizeof(Elf_Sym);
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// The symbol table always needs a null symbol
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SymTab.addSymbol("", 0, 0, nullptr, 0, 0, 0, 0);
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@ -739,8 +815,7 @@ BinaryELFBuilder<ELFT>::addSymTab(StringTableSection *StrTab) {
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return &SymTab;
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}
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template <class ELFT>
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void BinaryELFBuilder<ELFT>::addData(SymbolTableSection *SymTab) {
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void BinaryELFBuilder::addData(SymbolTableSection *SymTab) {
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auto Data = ArrayRef<uint8_t>(
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reinterpret_cast<const uint8_t *>(MemBuf->getBufferStart()),
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MemBuf->getBufferSize());
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@ -763,13 +838,13 @@ void BinaryELFBuilder<ELFT>::addData(SymbolTableSection *SymTab) {
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/*Value=*/DataSection.Size, STV_DEFAULT, SHN_ABS, 0);
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}
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template <class ELFT> void BinaryELFBuilder<ELFT>::initSections() {
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void BinaryELFBuilder::initSections() {
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for (auto &Section : Obj->sections()) {
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Section.initialize(Obj->sections());
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}
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}
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template <class ELFT> std::unique_ptr<Object> BinaryELFBuilder<ELFT>::build() {
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std::unique_ptr<Object> BinaryELFBuilder::build() {
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initFileHeader();
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initHeaderSegment();
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StringTableSection *StrTab = addStrTab();
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@ -1122,14 +1197,7 @@ Writer::~Writer() {}
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Reader::~Reader() {}
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std::unique_ptr<Object> BinaryReader::create() const {
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if (MInfo.Is64Bit)
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return MInfo.IsLittleEndian
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? BinaryELFBuilder<ELF64LE>(MInfo.EMachine, MemBuf).build()
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: BinaryELFBuilder<ELF64BE>(MInfo.EMachine, MemBuf).build();
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else
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return MInfo.IsLittleEndian
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? BinaryELFBuilder<ELF32LE>(MInfo.EMachine, MemBuf).build()
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: BinaryELFBuilder<ELF32BE>(MInfo.EMachine, MemBuf).build();
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return BinaryELFBuilder(MInfo.EMachine, MemBuf).build();
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}
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std::unique_ptr<Object> ELFReader::create() const {
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@ -1483,10 +1551,16 @@ template <class ELFT> void ELFWriter<ELFT>::finalize() {
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}
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initEhdrSegment();
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// Before we can prepare for layout the indexes need to be finalized.
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// Also, the output arch may not be the same as the input arch, so fix up
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// size-related fields before doing layout calculations.
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uint64_t Index = 0;
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for (auto &Sec : Obj.sections())
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auto SecSizer = llvm::make_unique<ELFSectionSizer<ELFT>>();
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for (auto &Sec : Obj.sections()) {
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Sec.Index = Index++;
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Sec.accept(*SecSizer);
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}
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// The symbol table does not update all other sections on update. For
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// instance, symbol names are not added as new symbols are added. This means
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@ -1607,11 +1681,6 @@ void BinaryWriter::finalize() {
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SecWriter = llvm::make_unique<BinarySectionWriter>(Buf);
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}
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template class BinaryELFBuilder<ELF64LE>;
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template class BinaryELFBuilder<ELF64BE>;
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template class BinaryELFBuilder<ELF32LE>;
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template class BinaryELFBuilder<ELF32BE>;
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template class ELFBuilder<ELF64LE>;
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template class ELFBuilder<ELF64BE>;
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template class ELFBuilder<ELF32LE>;
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@ -71,7 +71,7 @@ enum ElfType { ELFT_ELF32LE, ELFT_ELF64LE, ELFT_ELF32BE, ELFT_ELF64BE };
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class SectionVisitor {
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public:
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virtual ~SectionVisitor();
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virtual ~SectionVisitor() = default;
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virtual void visit(const Section &Sec) = 0;
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virtual void visit(const OwnedDataSection &Sec) = 0;
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@ -86,6 +86,23 @@ public:
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virtual void visit(const DecompressedSection &Sec) = 0;
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};
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class MutableSectionVisitor {
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public:
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virtual ~MutableSectionVisitor() = default;
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virtual void visit(Section &Sec) = 0;
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virtual void visit(OwnedDataSection &Sec) = 0;
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virtual void visit(StringTableSection &Sec) = 0;
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virtual void visit(SymbolTableSection &Sec) = 0;
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virtual void visit(RelocationSection &Sec) = 0;
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virtual void visit(DynamicRelocationSection &Sec) = 0;
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virtual void visit(GnuDebugLinkSection &Sec) = 0;
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virtual void visit(GroupSection &Sec) = 0;
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virtual void visit(SectionIndexSection &Sec) = 0;
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virtual void visit(CompressedSection &Sec) = 0;
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virtual void visit(DecompressedSection &Sec) = 0;
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};
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class SectionWriter : public SectionVisitor {
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protected:
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Buffer &Out;
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@ -128,9 +145,30 @@ public:
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explicit ELFSectionWriter(Buffer &Buf) : SectionWriter(Buf) {}
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};
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template <class ELFT> class ELFSectionSizer : public MutableSectionVisitor {
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private:
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using Elf_Rel = typename ELFT::Rel;
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using Elf_Rela = typename ELFT::Rela;
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using Elf_Sym = typename ELFT::Sym;
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public:
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void visit(Section &Sec) override;
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void visit(OwnedDataSection &Sec) override;
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void visit(StringTableSection &Sec) override;
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void visit(DynamicRelocationSection &Sec) override;
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void visit(SymbolTableSection &Sec) override;
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void visit(RelocationSection &Sec) override;
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void visit(GnuDebugLinkSection &Sec) override;
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void visit(GroupSection &Sec) override;
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void visit(SectionIndexSection &Sec) override;
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void visit(CompressedSection &Sec) override;
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void visit(DecompressedSection &Sec) override;
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};
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#define MAKE_SEC_WRITER_FRIEND \
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friend class SectionWriter; \
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template <class ELFT> friend class ELFSectionWriter;
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template <class ELFT> friend class ELFSectionWriter; \
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template <class ELFT> friend class ELFSectionSizer;
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class BinarySectionWriter : public SectionWriter {
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public:
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@ -237,6 +275,7 @@ public:
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virtual void removeSectionReferences(const SectionBase *Sec);
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virtual void removeSymbols(function_ref<bool(const Symbol &)> ToRemove);
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virtual void accept(SectionVisitor &Visitor) const = 0;
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virtual void accept(MutableSectionVisitor &Visitor) = 0;
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virtual void markSymbols();
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};
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@ -293,6 +332,7 @@ public:
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explicit Section(ArrayRef<uint8_t> Data) : Contents(Data) {}
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void accept(SectionVisitor &Visitor) const override;
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void accept(MutableSectionVisitor &Visitor) override;
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void removeSectionReferences(const SectionBase *Sec) override;
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void initialize(SectionTableRef SecTable) override;
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void finalize() override;
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@ -313,6 +353,7 @@ public:
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}
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void accept(SectionVisitor &Sec) const override;
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void accept(MutableSectionVisitor &Visitor) override;
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};
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class CompressedSection : public SectionBase {
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@ -333,6 +374,7 @@ public:
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uint64_t getDecompressedAlign() const { return DecompressedAlign; }
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void accept(SectionVisitor &Visitor) const override;
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void accept(MutableSectionVisitor &Visitor) override;
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static bool classof(const SectionBase *S) {
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return (S->Flags & ELF::SHF_COMPRESSED) ||
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@ -354,6 +396,7 @@ public:
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}
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void accept(SectionVisitor &Visitor) const override;
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void accept(MutableSectionVisitor &Visitor) override;
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};
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// There are two types of string tables that can exist, dynamic and not dynamic.
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@ -378,6 +421,7 @@ public:
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uint32_t findIndex(StringRef Name) const;
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void finalize() override;
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void accept(SectionVisitor &Visitor) const override;
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void accept(MutableSectionVisitor &Visitor) override;
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static bool classof(const SectionBase *S) {
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if (S->Flags & ELF::SHF_ALLOC)
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@ -435,6 +479,7 @@ public:
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void initialize(SectionTableRef SecTable) override;
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void finalize() override;
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void accept(SectionVisitor &Visitor) const override;
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void accept(MutableSectionVisitor &Visitor) override;
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SectionIndexSection() {
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Name = ".symtab_shndx";
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@ -479,6 +524,7 @@ public:
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void initialize(SectionTableRef SecTable) override;
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void finalize() override;
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void accept(SectionVisitor &Visitor) const override;
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void accept(MutableSectionVisitor &Visitor) override;
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void removeSymbols(function_ref<bool(const Symbol &)> ToRemove) override;
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static bool classof(const SectionBase *S) {
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@ -540,6 +586,7 @@ class RelocationSection
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public:
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void addRelocation(Relocation Rel) { Relocations.push_back(Rel); }
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void accept(SectionVisitor &Visitor) const override;
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void accept(MutableSectionVisitor &Visitor) override;
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void removeSymbols(function_ref<bool(const Symbol &)> ToRemove) override;
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void markSymbols() override;
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@ -573,6 +620,7 @@ public:
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void addMember(SectionBase *Sec) { GroupMembers.push_back(Sec); }
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|
||||
void accept(SectionVisitor &) const override;
|
||||
void accept(MutableSectionVisitor &Visitor) override;
|
||||
void finalize() override;
|
||||
void removeSymbols(function_ref<bool(const Symbol &)> ToRemove) override;
|
||||
void markSymbols() override;
|
||||
|
|
@ -611,6 +659,7 @@ public:
|
|||
explicit DynamicRelocationSection(ArrayRef<uint8_t> Data) : Contents(Data) {}
|
||||
|
||||
void accept(SectionVisitor &) const override;
|
||||
void accept(MutableSectionVisitor &Visitor) override;
|
||||
|
||||
static bool classof(const SectionBase *S) {
|
||||
if (!(S->Flags & ELF::SHF_ALLOC))
|
||||
|
|
@ -632,6 +681,7 @@ public:
|
|||
// If we add this section from an external source we can use this ctor.
|
||||
explicit GnuDebugLinkSection(StringRef File);
|
||||
void accept(SectionVisitor &Visitor) const override;
|
||||
void accept(MutableSectionVisitor &Visitor) override;
|
||||
};
|
||||
|
||||
class Reader {
|
||||
|
|
@ -645,9 +695,7 @@ using object::ELFFile;
|
|||
using object::ELFObjectFile;
|
||||
using object::OwningBinary;
|
||||
|
||||
template <class ELFT> class BinaryELFBuilder {
|
||||
using Elf_Sym = typename ELFT::Sym;
|
||||
|
||||
class BinaryELFBuilder {
|
||||
uint16_t EMachine;
|
||||
MemoryBuffer *MemBuf;
|
||||
std::unique_ptr<Object> Obj;
|
||||
|
|
|
|||
Loading…
Reference in New Issue