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// readsyms.h -- read input file symbols 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_READSYMS_H
#define GOLD_READSYMS_H
#include <vector>
#include "workqueue.h"
#include "object.h"
namespace gold
{
class Input_objects;
class Symbol_table;
class Input_group;
class Archive;
// This Task is responsible for reading the symbols from an input
// file. This also includes reading the relocations so that we can
// check for any that require a PLT and/or a GOT. After the data has
// been read, this queues up another task to actually add the symbols
// to the symbol table. The tasks are separated because the file
// reading can occur in parallel but adding the symbols must be done
// in the order of the input files.
class Read_symbols : public Task
{
public:
// DIRPATH is the list of directories to search for libraries.
// INPUT is the file to read. INPUT_GROUP is not NULL if we are in
// the middle of an input group. THIS_BLOCKER is used to prevent
// the associated Add_symbols task from running before the previous
// one has completed; it will be NULL for the first task.
// NEXT_BLOCKER is used to block the next input file from adding
// symbols.
Read_symbols(const General_options& options, Input_objects* input_objects,
Symbol_table* symtab, Layout* layout, const Dirsearch& dirpath,
const Input_argument* input_argument, Input_group* input_group,
Task_token* this_blocker, Task_token* next_blocker)
: options_(options), input_objects_(input_objects), symtab_(symtab),
layout_(layout), dirpath_(dirpath), input_argument_(input_argument),
input_group_(input_group), this_blocker_(this_blocker),
next_blocker_(next_blocker)
{ }
~Read_symbols();
// The standard Task methods.
Is_runnable_type
is_runnable(Workqueue*);
Task_locker*
locks(Workqueue*);
void
run(Workqueue*);
private:
// Handle an archive group.
void
do_group(Workqueue*);
// Open and identify the file.
bool
do_read_symbols(Workqueue*);
const General_options& options_;
Input_objects* input_objects_;
Symbol_table* symtab_;
Layout* layout_;
const Dirsearch& dirpath_;
const Input_argument* input_argument_;
Input_group* input_group_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
// This Task handles adding the symbols to the symbol table. These
// tasks must be run in the same order as the arguments appear on the
// command line.
class Add_symbols : public Task
{
public:
// THIS_BLOCKER is used to prevent this task from running before the
// one for the previous input file. NEXT_BLOCKER is used to prevent
// the next task from running.
Add_symbols(Input_objects* input_objects, Symbol_table* symtab,
Layout* layout, Object* object,
Read_symbols_data* sd, Task_token* this_blocker,
Task_token* next_blocker)
: input_objects_(input_objects), symtab_(symtab), layout_(layout),
object_(object), sd_(sd), this_blocker_(this_blocker),
next_blocker_(next_blocker)
{ }
~Add_symbols();
// The standard Task methods.
Is_runnable_type
is_runnable(Workqueue*);
Task_locker*
locks(Workqueue*);
void
run(Workqueue*);
private:
class Add_symbols_locker;
Input_objects* input_objects_;
Symbol_table* symtab_;
Layout* layout_;
Object* object_;
Read_symbols_data* sd_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
// This class is used to track the archives in a group.
class Input_group
{
public:
typedef std::vector<Archive*> Archives;
typedef Archives::const_iterator const_iterator;
Input_group()
: archives_()
{ }
// Add an archive to the group.
void
add_archive(Archive* arch)
{ this->archives_.push_back(arch); }
// Loop over the archives in the group.
const_iterator
begin() const
{ return this->archives_.begin(); }
const_iterator
end() const
{ return this->archives_.end(); }
private:
Archives archives_;
};
// This class is used to finish up handling a group. It is just a
// closure.
class Finish_group : public Task
{
public:
Finish_group(Input_objects* input_objects, Symbol_table* symtab,
Layout* layout, Input_group* input_group,
int saw_undefined, Task_token* this_blocker,
Task_token* next_blocker)
: input_objects_(input_objects), symtab_(symtab),
layout_(layout), input_group_(input_group),
saw_undefined_(saw_undefined), this_blocker_(this_blocker),
next_blocker_(next_blocker)
{ }
~Finish_group();
// The standard Task methods.
Is_runnable_type
is_runnable(Workqueue*);
Task_locker*
locks(Workqueue*);
void
run(Workqueue*);
private:
Input_objects* input_objects_;
Symbol_table* symtab_;
Layout* layout_;
Input_group* input_group_;
int saw_undefined_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
} // end namespace gold
#endif // !defined(GOLD_READSYMS_H)
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