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// archive.h -- archive support for gold -*- C++ -*-
// Copyright 2006, 2007 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
#ifndef GOLD_ARCHIVE_H
#define GOLD_ARCHIVE_H
#include <string>
#include <vector>
#include "workqueue.h"
namespace gold
{
class Input_file;
class Input_objects;
class Input_group;
class Layout;
class Symbol_table;
// This class represents an archive--generally a libNAME.a file.
// Archives have a symbol table and a list of objects.
class Archive
{
public:
Archive(const std::string& name, Input_file* input_file)
: name_(name), input_file_(input_file), armap_(), armap_names_(),
extended_names_(), armap_checked_(), seen_offsets_()
{ }
// The length of the magic string at the start of an archive.
static const int sarmag = 8;
// The magic string at the start of an archive.
static const char armag[sarmag];
// The string expected at the end of an archive member header.
static const char arfmag[2];
// The name of the object.
const std::string&
name() const
{ return this->name_; }
// Set up the archive: read the symbol map.
void
setup();
// Get a reference to the underlying file.
File_read&
file()
{ return this->input_file_->file(); }
// Lock the underlying file.
void
lock()
{ this->input_file_->file().lock(); }
// Unlock the underlying file.
void
unlock()
{ this->input_file_->file().unlock(); }
// Return whether the underlying file is locked.
bool
is_locked() const
{ return this->input_file_->file().is_locked(); }
// Select members from the archive as needed and add them to the
// link.
void
add_symbols(Symbol_table*, Layout*, Input_objects*);
private:
Archive(const Archive&);
Archive& operator=(const Archive&);
struct Archive_header;
// Get a view into the underlying file.
const unsigned char*
get_view(off_t start, off_t size, bool cache)
{ return this->input_file_->file().get_view(start, size, cache); }
// Read the archive symbol map.
void
read_armap(off_t start, off_t size);
// Read an archive member header at OFF. Return the size of the
// member, and set *PNAME to the name.
off_t
read_header(off_t off, std::string* pname);
// Interpret an archive header HDR at OFF. Return the size of the
// member, and set *PNAME to the name.
off_t
interpret_header(const Archive_header* hdr, off_t off, std::string* pname);
// Include all the archive members in the link.
void
include_all_members(Symbol_table*, Layout*, Input_objects*);
// Include an archive member in the link.
void
include_member(Symbol_table*, Layout*, Input_objects*, off_t off);
// An entry in the archive map of symbols to object files.
struct Armap_entry
{
// The offset to the symbol name in armap_names_.
off_t name_offset;
// The file offset to the object in the archive.
off_t file_offset;
};
// A simple hash code for off_t values.
class Seen_hash
{
public:
size_t operator()(off_t val) const
{ return static_cast<size_t>(val); }
};
// Name of object as printed to user.
std::string name_;
// For reading the file.
Input_file* input_file_;
// The archive map.
std::vector<Armap_entry> armap_;
// The names in the archive map.
std::string armap_names_;
// The extended name table.
std::string extended_names_;
// Track which symbols in the archive map are for elements which are
// defined or which have already been included in the link.
std::vector<bool> armap_checked_;
// Track which elements have been included by offset.
Unordered_set<off_t, Seen_hash> seen_offsets_;
};
// This class is used to read an archive and pick out the desired
// elements and add them to the link.
class Add_archive_symbols : public Task
{
public:
Add_archive_symbols(Symbol_table* symtab, Layout* layout,
Input_objects* input_objects,
Archive* archive, Input_group* input_group,
Task_token* this_blocker,
Task_token* next_blocker)
: symtab_(symtab), layout_(layout), input_objects_(input_objects),
archive_(archive), input_group_(input_group),
this_blocker_(this_blocker), next_blocker_(next_blocker)
{ }
~Add_archive_symbols();
// The standard Task methods.
Is_runnable_type
is_runnable(Workqueue*);
Task_locker*
locks(Workqueue*);
void
run(Workqueue*);
private:
class Add_archive_symbols_locker;
Symbol_table* symtab_;
Layout* layout_;
Input_objects* input_objects_;
Archive* archive_;
Input_group* input_group_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
} // End namespace gold.
#endif // !defined(GOLD_ARCHIVE_H)
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