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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
109 lines
4.0 KiB
C++
109 lines
4.0 KiB
C++
//===- DWARF.cpp ----------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 "DWARF.h"
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#include "Symbols.h"
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#include "Target.h"
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#include "lld/Common/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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template <class ELFT> LLDDwarfObj<ELFT>::LLDDwarfObj(ObjFile<ELFT> *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 =
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StringSwitch<LLDDWARFSection *>(Sec->Name)
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.Case(".debug_addr", &AddrSection)
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.Case(".debug_gnu_pubnames", &GnuPubNamesSection)
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.Case(".debug_gnu_pubtypes", &GnuPubTypesSection)
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.Case(".debug_info", &InfoSection)
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.Case(".debug_ranges", &RangeSection)
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.Case(".debug_rnglists", &RngListsSection)
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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_str")
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StrSection = toStringRef(Sec->data());
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else if (Sec->Name == ".debug_line_str")
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LineStringSection = 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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// Broken debug info can point to a non-Defined symbol.
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auto *DR = dyn_cast<Defined>(&File->getRelocTargetSym(Rel));
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if (!DR) {
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RelType Type = Rel.getType(Config->IsMips64EL);
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if (Type != Target->NoneRel)
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error(toString(File) + ": relocation " + lld::toString(Type) + " at 0x" +
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llvm::utohexstr(Rel.r_offset) + " has unsupported target");
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return None;
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}
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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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