forked from OSchip/llvm-project
118 lines
4.1 KiB
C++
118 lines
4.1 KiB
C++
//===- GdbIndex.cpp -------------------------------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// The -gdb-index option instructs the linker to emit a .gdb_index section.
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// The section contains information to make gdb startup faster.
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// The format of the section is described at
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// https://sourceware.org/gdb/onlinedocs/gdb/Index-Section-Format.html.
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//
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//===----------------------------------------------------------------------===//
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#include "GdbIndex.h"
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#include "Memory.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugPubTable.h"
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#include "llvm/Object/ELFObjectFile.h"
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using namespace llvm;
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using namespace llvm::object;
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using namespace lld;
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using namespace lld::elf;
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std::pair<bool, GdbSymbol *> GdbHashTab::add(uint32_t Hash, size_t Offset) {
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GdbSymbol *&Sym = Map[Offset];
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if (Sym)
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return {false, Sym};
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Sym = make<GdbSymbol>(Hash, Offset);
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return {true, Sym};
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}
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void GdbHashTab::finalizeContents() {
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uint32_t Size = std::max<uint32_t>(1024, NextPowerOf2(Map.size() * 4 / 3));
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uint32_t Mask = Size - 1;
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Table.resize(Size);
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for (auto &P : Map) {
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GdbSymbol *Sym = P.second;
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uint32_t I = Sym->NameHash & Mask;
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uint32_t Step = ((Sym->NameHash * 17) & Mask) | 1;
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while (Table[I])
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I = (I + Step) & Mask;
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Table[I] = Sym;
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}
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}
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template <class ELFT>
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LLDDwarfObj<ELFT>::LLDDwarfObj(ObjFile<ELFT> *Obj) : Obj(Obj) {
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for (InputSectionBase *Sec : Obj->getSections()) {
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if (!Sec)
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continue;
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if (LLDDWARFSection *M = StringSwitch<LLDDWARFSection *>(Sec->Name)
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.Case(".debug_info", &InfoSection)
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.Case(".debug_ranges", &RangeSection)
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.Case(".debug_line", &LineSection)
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.Default(nullptr)) {
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M->Data = toStringRef(Sec->Data);
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M->Sec = Sec;
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continue;
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}
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if (Sec->Name == ".debug_abbrev")
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AbbrevSection = toStringRef(Sec->Data);
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else if (Sec->Name == ".debug_gnu_pubnames")
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GnuPubNamesSection = toStringRef(Sec->Data);
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else if (Sec->Name == ".debug_gnu_pubtypes")
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GnuPubTypesSection = toStringRef(Sec->Data);
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}
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}
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// Find if there is a relocation at Pos in Sec. The code is a bit
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// more complicated than usual because we need to pass a section index
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// to llvm since it has no idea about InputSection.
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template <class ELFT>
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template <class RelTy>
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Optional<RelocAddrEntry>
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LLDDwarfObj<ELFT>::findAux(const InputSectionBase &Sec, uint64_t Pos,
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ArrayRef<RelTy> Rels) const {
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auto It = std::lower_bound(
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Rels.begin(), Rels.end(), Pos,
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[](const RelTy &A, uint64_t B) { return A.r_offset < B; });
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if (It == Rels.end() || It->r_offset != Pos)
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return None;
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const RelTy &Rel = *It;
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const ObjFile<ELFT> *File = Sec.getFile<ELFT>();
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uint32_t SymIndex = Rel.getSymbol(Config->IsMips64EL);
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const typename ELFT::Sym &Sym = File->getELFSyms()[SymIndex];
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uint32_t SecIndex = File->getSectionIndex(Sym);
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SymbolBody &B = File->getRelocTargetSym(Rel);
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auto &DR = cast<DefinedRegular>(B);
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uint64_t Val = DR.Value + getAddend<ELFT>(Rel);
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// FIXME: We should be consistent about always adding the file
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// offset or not.
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if (DR.Section->Flags & ELF::SHF_ALLOC)
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Val += cast<InputSection>(DR.Section)->getOffsetInFile();
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return RelocAddrEntry{SecIndex, Val};
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}
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template <class ELFT>
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Optional<RelocAddrEntry> LLDDwarfObj<ELFT>::find(const llvm::DWARFSection &S,
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uint64_t Pos) const {
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auto &Sec = static_cast<const LLDDWARFSection &>(S);
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if (Sec.Sec->AreRelocsRela)
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return findAux(*Sec.Sec, Pos, Sec.Sec->template relas<ELFT>());
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return findAux(*Sec.Sec, Pos, Sec.Sec->template rels<ELFT>());
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}
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template class elf::LLDDwarfObj<ELF32LE>;
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template class elf::LLDDwarfObj<ELF32BE>;
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template class elf::LLDDwarfObj<ELF64LE>;
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template class elf::LLDDwarfObj<ELF64BE>;
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