eeee23e60a
to the list of undefined atoms. The processing of undefined atoms from dynamic libraries is controlled by use-shlib-undefines command line option. This patch also adds additional command line arguments to allow/disallow unresolved symbols from shared libraries and mimics GNU ld behavior. llvm-svn: 179257
141 lines
4.4 KiB
C++
141 lines
4.4 KiB
C++
//===- lib/ReaderWriter/ELF/DynamicFile.h ---------------------------------===//
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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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#ifndef LLD_READER_WRITER_ELF_DYNAMIC_FILE_H
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#define LLD_READER_WRITER_ELF_DYNAMIC_FILE_H
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#include "Atoms.h"
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#include "lld/Core/SharedLibraryFile.h"
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#include "lld/ReaderWriter/ELFTargetInfo.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Support/Path.h"
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#include <unordered_map>
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namespace lld {
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namespace elf {
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template <class ELFT> class DynamicFile LLVM_FINAL : public SharedLibraryFile {
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public:
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static ErrorOr<std::unique_ptr<DynamicFile> > create(
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const ELFTargetInfo &ti, std::unique_ptr<llvm::MemoryBuffer> mb) {
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std::unique_ptr<DynamicFile> file(
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new DynamicFile(ti, mb->getBufferIdentifier()));
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llvm::OwningPtr<llvm::object::Binary> binaryFile;
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bool useShlibUndefines = ti.useShlibUndefines();
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if (error_code ec = createBinary(mb.release(), binaryFile))
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return ec;
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// Point Obj to correct class and bitwidth ELF object
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file->_objFile.reset(
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dyn_cast<llvm::object::ELFObjectFile<ELFT>>(binaryFile.get()));
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if (!file->_objFile)
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return make_error_code(llvm::object::object_error::invalid_file_type);
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binaryFile.take();
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llvm::object::ELFObjectFile<ELFT> &obj = *file->_objFile;
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file->_soname = obj.getLoadName();
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if (file->_soname.empty())
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file->_soname = llvm::sys::path::filename(file->path());
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// Create a map from names to dynamic symbol table entries.
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// TODO: This should use the object file's build in hash table instead if
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// it exists.
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for (auto i = obj.begin_elf_dynamic_symbols(),
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e = obj.end_elf_dynamic_symbols();
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i != e; ++i) {
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StringRef name;
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if (error_code ec = obj.getSymbolName(
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obj.getDynamicSymbolTableSectionHeader(), &*i, name))
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return ec;
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// TODO: Add absolute symbols
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if (i->st_shndx == llvm::ELF::SHN_ABS)
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continue;
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if (useShlibUndefines && (i->st_shndx == llvm::ELF::SHN_UNDEF)) {
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// Create an undefined atom.
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if (!name.empty()) {
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auto *newAtom =
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new (file->_alloc) ELFUndefinedAtom<ELFT>(*file.get(), name, &*i);
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file->_undefinedAtoms._atoms.push_back(newAtom);
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}
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continue;
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}
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file->_nameToSym[name]._symbol = &*i;
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}
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return std::move(file);
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}
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virtual const atom_collection<DefinedAtom> &defined() const {
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return _definedAtoms;
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}
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virtual const atom_collection<UndefinedAtom> &undefined() const {
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return _undefinedAtoms;
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}
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virtual const atom_collection<SharedLibraryAtom> &sharedLibrary() const {
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return _sharedLibraryAtoms;
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}
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virtual const atom_collection<AbsoluteAtom> &absolute() const {
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return _absoluteAtoms;
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}
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virtual const SharedLibraryAtom *exports(StringRef name,
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bool dataSymbolOnly) const {
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assert(!dataSymbolOnly && "Invalid option for ELF exports!");
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// See if we have the symbol.
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auto sym = _nameToSym.find(name);
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if (sym == _nameToSym.end())
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return nullptr;
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// Have we already created a SharedLibraryAtom for it?
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if (sym->second._atom)
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return sym->second._atom;
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// Create a SharedLibraryAtom for this symbol.
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return sym->second._atom = new (_alloc) ELFDynamicAtom<ELFT>(
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*this, name, _soname, sym->second._symbol);
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}
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virtual const ELFTargetInfo &getTargetInfo() const { return _targetInfo; }
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private:
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DynamicFile(const ELFTargetInfo &ti, StringRef name)
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: SharedLibraryFile(name), _targetInfo(ti) {}
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mutable llvm::BumpPtrAllocator _alloc;
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const ELFTargetInfo &_targetInfo;
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std::unique_ptr<llvm::object::ELFObjectFile<ELFT>> _objFile;
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atom_collection_vector<DefinedAtom> _definedAtoms;
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atom_collection_vector<UndefinedAtom> _undefinedAtoms;
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atom_collection_vector<SharedLibraryAtom> _sharedLibraryAtoms;
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atom_collection_vector<AbsoluteAtom> _absoluteAtoms;
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/// \brief DT_SONAME
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StringRef _soname;
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struct SymAtomPair {
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SymAtomPair() : _symbol(nullptr), _atom(nullptr) {}
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const typename llvm::object::ELFObjectFile<ELFT>::Elf_Sym *_symbol;
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const SharedLibraryAtom *_atom;
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};
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mutable std::unordered_map<StringRef, SymAtomPair> _nameToSym;
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};
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} // end namespace elf
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} // end namespace lld
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#endif
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