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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"
#include "lld/Core/ArchiveLibraryFile.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/Object/ObjectFile.h"
#include <unordered_map>
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 {
auto member = _symbolMemberMap.find(name);
if (member == _symbolMemberMap.end())
return nullptr;
llvm::object::Archive::child_iterator ci = member->second;
if (dataSymbolOnly) {
OwningPtr<MemoryBuffer> buff;
if (ci->getMemoryBuffer(buff, true))
return nullptr;
if (isDataSymbol(buff.take(), name))
return nullptr;
}
std::vector<std::unique_ptr<File>> result;
OwningPtr<MemoryBuffer> buff;
if (ci->getMemoryBuffer(buff, true))
return nullptr;
if (_targetInfo.logInputFiles())
llvm::outs() << buff->getBufferIdentifier() << "\n";
std::unique_ptr<MemoryBuffer> mb(buff.take());
if (_targetInfo.parseFile(mb, result))
return nullptr;
assert(result.size() == 1);
result[0]->setOrdinalAndIncrement(_curChildOrd);
// give up the pointer so that this object no longer manages it
return result[0].release();
}
virtual void setOrdinalAndIncrement(uint64_t &ordinal) const {
_ordinal = ordinal++;
_curChildOrd = _ordinal;
// Leave space in ordinal range for all children
for (auto mf = _archive->begin_children(),
me = _archive->end_children(); mf != me; ++mf) {
ordinal++;
}
}
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;
atom_collection_vector<DefinedAtom> _definedAtoms;
atom_collection_vector<UndefinedAtom> _undefinedAtoms;
atom_collection_vector<SharedLibraryAtom> _sharedLibraryAtoms;
atom_collection_vector<AbsoluteAtom> _absoluteAtoms;
mutable uint64_t _curChildOrd;
public:
/// only subclasses of ArchiveLibraryFile can be instantiated
FileArchive(const TargetInfo &ti,
std::unique_ptr<llvm::MemoryBuffer> mb, error_code &ec)
: ArchiveLibraryFile(ti, mb->getBufferIdentifier()) {
std::unique_ptr<llvm::object::Archive> archive_obj(
new llvm::object::Archive(mb.release(), ec));
if (ec)
return;
_archive.swap(archive_obj);
// Cache symbols.
for (auto i = _archive->begin_symbols(), e = _archive->end_symbols();
i != e; ++i) {
StringRef name;
llvm::object::Archive::child_iterator member;
if ((ec = i->getName(name)))
return;
if ((ec = i->getMember(member)))
return;
_symbolMemberMap[name] = member;
}
}
std::unordered_map<StringRef,
llvm::object::Archive::child_iterator> _symbolMemberMap;
}; // 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) const {
error_code ec;
if (_targetInfo.forceLoadAllArchives()) {
_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) {
OwningPtr<MemoryBuffer> buff;
if ((ec = mf->getMemoryBuffer(buff, true)))
return ec;
std::unique_ptr<MemoryBuffer> mbc(buff.take());
if (_targetInfo.logInputFiles())
llvm::outs() << buff->getBufferIdentifier() << "\n";
if ((ec = _targetInfo.parseFile(mbc, result)))
return ec;
}
} else {
std::unique_ptr<File> f;
f.reset(new FileArchive(_targetInfo, std::move(mb), ec));
if (ec)
return ec;
result.push_back(std::move(f));
}
return llvm::error_code::success();
}
} // end namespace lld
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