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//===- lib/ReaderWriter/ReaderArchive.cpp - Archive Library Reader--------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===---------------------------------------------------------------------===//
#include "lld/ReaderWriter/ReaderArchive.h"
namespace lld {
/// \brief The FileArchive class represents an Archive Library file
class FileArchive : public ArchiveLibraryFile {
public:
virtual ~FileArchive() { }
/// \brief Check if any member of the archive contains an Atom with the
/// specified name and return the File object for that member, or nullptr.
virtual const File *find(StringRef name, bool dataSymbolOnly) const {
error_code ec;
llvm::object::Archive::child_iterator ci;
ci = _archive.get()->findSym(name);
if (ci == _archive->end_children())
return nullptr;
if (dataSymbolOnly && (ec = isDataSymbol(ci->getBuffer(), name)))
return nullptr;
std::vector<std::unique_ptr<File>> result;
if ((ec = _options.reader()->parseFile(std::unique_ptr<MemoryBuffer>
(ci->getBuffer()), result)))
return nullptr;
assert(result.size() == 1);
// give up the pointer so that this object no longer manages it
return result[0].release();
}
virtual void addAtom(const Atom&) {
llvm_unreachable("cannot add atoms to archive files");
}
virtual const atom_collection<DefinedAtom> &defined() const {
return _definedAtoms;
}
virtual const atom_collection<UndefinedAtom> &undefined() const {
return _undefinedAtoms;
}
virtual const atom_collection<SharedLibraryAtom> &sharedLibrary() const {
return _sharedLibraryAtoms;
}
virtual const atom_collection<AbsoluteAtom> &absolute() const {
return _absoluteAtoms;
}
protected:
error_code isDataSymbol(MemoryBuffer *mb, StringRef symbol) const {
std::unique_ptr<llvm::object::ObjectFile>
obj(llvm::object::ObjectFile::createObjectFile(mb));
error_code ec;
llvm::object::SymbolRef::Type symtype;
uint32_t symflags;
llvm::object::symbol_iterator ibegin = obj->begin_symbols();
llvm::object::symbol_iterator iend = obj->end_symbols();
StringRef symbolname;
for (llvm::object::symbol_iterator i = ibegin; i != iend; i.increment(ec)) {
if (ec) return ec;
// Get symbol name
if ((ec = (i->getName(symbolname)))) return ec;
if (symbolname != symbol)
continue;
// Get symbol flags
if ((ec = (i->getFlags(symflags)))) return ec;
if (symflags <= llvm::object::SymbolRef::SF_Undefined)
continue;
// Get Symbol Type
if ((ec = (i->getType(symtype)))) return ec;
if (symtype == llvm::object::SymbolRef::ST_Data) {
return error_code::success();
}
}
return llvm::object::object_error::parse_failed;
}
private:
std::unique_ptr<llvm::object::Archive> _archive;
const ReaderOptionsArchive _options;
atom_collection_vector<DefinedAtom> _definedAtoms;
atom_collection_vector<UndefinedAtom> _undefinedAtoms;
atom_collection_vector<SharedLibraryAtom> _sharedLibraryAtoms;
atom_collection_vector<AbsoluteAtom> _absoluteAtoms;
public:
/// only subclasses of ArchiveLibraryFile can be instantiated
explicit FileArchive(llvm::MemoryBuffer *mb,
const ReaderOptionsArchive &options,
error_code &ec)
:ArchiveLibraryFile(mb->getBufferIdentifier()),
_options(options) {
std::unique_ptr<llvm::object::Archive> archive_obj(
new llvm::object::Archive(mb, ec));
if (ec)
return;
_archive.swap(archive_obj);
}
}; // class FileArchive
// Returns a vector of Files that are contained in the archive file
// pointed to by the MemoryBuffer
error_code ReaderArchive::parseFile(std::unique_ptr<llvm::MemoryBuffer> mb,
std::vector<std::unique_ptr<File>> &result) {
error_code ec;
if (_options.isForceLoad()) {
_archive.reset(new llvm::object::Archive(mb.release(), ec));
if (ec)
return ec;
for (auto mf = _archive->begin_children(),
me = _archive->end_children(); mf != me; ++mf) {
if ((ec = _options.reader()->parseFile(std::unique_ptr<MemoryBuffer>
(mf->getBuffer()), result)))
return ec;
}
} else {
std::unique_ptr<File> f;
f.reset(new FileArchive(mb.release(), _options, ec));
if (ec)
return ec;
result.push_back(std::move(f));
}
return llvm::error_code::success();
}
} // namespace lld
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