old-cross-binutils/gold/archive.h
Ian Lance Taylor 39d0cb0e83 * fileread.cc (File_read::find_view): Add byteshift and vshifted
parameters.  Update for new key type to views_.  Change all
	callers.
	(File_read::read): Adjust for byteshift in returned view.
	(File_read::add_view): New function, broken out of
	find_and_make_view.
	(File_read::make_view): New function, broken out of
	find_and_make_view.
	(File_read::find_or_make_view): Add offset and aligned
	parameters.  Rewrite accordingly.  Change all callers.
	(File_read::get_view): Add offset and aligned parameters.  Adjust
	for byteshift in return value.
	(File_read::get_lasting_view): Likewise.
	* fileread.h (class File_read): Update declarations.
	(class File_read::View): Add byteshift_ field.  Add byteshift to
	constructor.  Add byteshift method.
	* archive.h (Archive::clear_uncached_views): New function.
	(Archive::get_view): Add aligned parameter.  Change all callers.
	* object.h (Object::get_view): Add aligned parameter.  Change all
	callers.
	(Object::get_lasting_view): Likewise.

	* fileread.cc (File_read::release): Don't call clear_views if
	there are multiple objects.
	* fileread.h (File_read::clear_uncached_views): New function.
	* archive.cc (Add_archive_symbols::run): Call clear_uncached_views
	on the archive.
2008-04-02 20:58:21 +00:00

246 lines
6.6 KiB
C++

// archive.h -- archive support for gold -*- C++ -*-
// Copyright 2006, 2007, 2008 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 Task;
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,
bool is_thin_archive, Dirsearch* dirpath, Task* task)
: name_(name), input_file_(input_file), armap_(), armap_names_(),
extended_names_(), armap_checked_(), seen_offsets_(),
is_thin_archive_(is_thin_archive), dirpath_(dirpath), task_(task)
{ }
// 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];
static const char armagt[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(const Task* t)
{ this->input_file_->file().lock(t); }
// Unlock the underlying file.
void
unlock(const Task* t)
{ this->input_file_->file().unlock(t); }
// Return whether the underlying file is locked.
bool
is_locked() const
{ return this->input_file_->file().is_locked(); }
// Return the token, so that the task can be queued.
Task_token*
token()
{ return this->input_file_->file().token(); }
// Release the underlying file.
void
release()
{ this->input_file_->file().release(); }
// Clear uncached views in the underlying file.
void
clear_uncached_views()
{ this->input_file_->file().clear_uncached_views(); }
// Unlock any nested archives.
void
unlock_nested_archives();
// 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, section_size_type size, bool aligned, bool cache)
{ return this->input_file_->file().get_view(0, start, size, aligned, cache); }
// Read the archive symbol map.
void
read_armap(off_t start, section_size_type size);
// Read an archive member header at OFF. CACHE is whether to cache
// the file view. Return the size of the member, and set *PNAME to
// the name.
off_t
read_header(off_t off, bool cache, std::string* pname, off_t* nested_off);
// 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,
off_t* nested_off);
// 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); }
};
// For keeping track of open nested archives in a thin archive file.
typedef Unordered_map<std::string, Archive*> Nested_archive_table;
// 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_;
// True if this is a thin archive.
const bool is_thin_archive_;
// Table of nested archives, indexed by filename.
Nested_archive_table nested_archives_;
// The directory search path.
Dirsearch* dirpath_;
// The task reading this archive.
Task *task_;
};
// 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.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const
{
if (this->archive_ == NULL)
return "Add_archive_symbols";
return "Add_archive_symbols " + this->archive_->file().filename();
}
private:
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)