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// inremental.h -- incremental linking support for gold -*- C++ -*-
// Copyright 2009 Free Software Foundation, Inc.
// Written by Mikolaj Zalewski <mikolajz@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_INCREMENTAL_H
#define GOLD_INCREMENTAL_H
#include <map>
#include <vector>
#include "stringpool.h"
#include "workqueue.h"
#include "fileread.h"
namespace gold
{
class Archive;
class Input_argument;
class Incremental_inputs_checker;
class Object;
class Output_section_data;
// Incremental input type as stored in .gnu_incremental_inputs.
enum Incremental_input_type
{
INCREMENTAL_INPUT_INVALID = 0,
INCREMENTAL_INPUT_OBJECT = 1,
INCREMENTAL_INPUT_ARCHIVE = 2,
INCREMENTAL_INPUT_SHARED_LIBRARY = 3,
INCREMENTAL_INPUT_SCRIPT = 4
};
// Code invoked early during an incremental link that checks what files need
// to be relinked.
class Incremental_checker
{
public:
Incremental_checker(const char* output_name)
: output_name_(output_name)
{ }
// Analyzes the output file to check if incremental linking is possible and
// what files needs to be relinked.
bool
can_incrementally_link_output_file();
private:
const char* output_name_;
};
// This class contains the information needed during an incremental
// build about the inputs necessary to build the .gnu_incremental_inputs.
class Incremental_inputs
{
public:
Incremental_inputs()
: lock_(new Lock()), inputs_(NULL), command_line_key_(0),
strtab_(new Stringpool())
{ }
~Incremental_inputs() { delete this->strtab_; }
// Record the command line.
void
report_command_line(int argc, const char* const* argv);
// Record the input arguments obtained from parsing the command line.
void
report_inputs(const Input_arguments& inputs)
{ this->inputs_ = &inputs; }
// Record that the input argument INPUT is an archive ARCHIVE.
void
report_archive(const Input_argument* input, Archive* archive);
// Record that the input argument INPUT is to an object OBJ.
void
report_object(const Input_argument* input, Object* obj);
// Record that the input argument INPUT is to an script SCRIPT.
void
report_script(const Input_argument* input, Timespec mtime,
Script_info* script);
// Prepare for layout. Called from Layout::finalize.
void
finalize();
// Create the content of the .gnu_incremental_inputs section.
Output_section_data*
create_incremental_inputs_section_data();
// Return the .gnu_incremental_strtab stringpool.
Stringpool*
get_stringpool()
{ return this->strtab_; }
private:
// Code for each of the four possible variants of create_inputs_section_data.
template<int size, bool big_endian>
Output_section_data*
sized_create_inputs_section_data();
// Compute indexes in the order in which the inputs should appear in
// .gnu_incremental_inputs and put file names to the stringtable.
// This needs to be done after all the scripts are parsed.
void
finalize_inputs(Input_argument_list::const_iterator begin,
Input_argument_list::const_iterator end,
unsigned int* index);
// Additional data about an input needed for an incremental link.
// None of these pointers is owned by the structure.
struct Input_info
{
Input_info()
: type(INCREMENTAL_INPUT_INVALID), archive(NULL), filename_key(0),
index(0)
{ }
// Type of the file pointed by this argument.
Incremental_input_type type;
union
{
// Present if type == INCREMENTAL_INPUT_ARCHIVE.
Archive* archive;
// Present if type == INCREMENTAL_INPUT_OBJECT or
// INCREMENTAL_INPUT_SHARED_LIBRARY.
Object* object;
// Present if type == INCREMENTAL_INPUT_SCRIPT.
Script_info* script;
};
// Key of the filename string in the section stringtable.
Stringpool::Key filename_key;
// Position of the entry information in the output section.
unsigned int index;
// Last modification time of the file.
Timespec mtime;
};
typedef std::map<const Input_argument*, Input_info> Inputs_info_map;
// A lock guarding access to inputs_ during the first phase of linking, when
// report_ function may be called from multiple threads.
Lock* lock_;
// The list of input arguments obtained from parsing the command line.
const Input_arguments* inputs_;
// A map containing additional information about the input elements.
Inputs_info_map inputs_map_;
// The key of the command line string in the string pool.
Stringpool::Key command_line_key_;
// The .gnu_incremental_strtab string pool associated with the
// .gnu_incremental_inputs.
Stringpool* strtab_;
};
} // End namespace gold.
#endif // !defined(GOLD_INCREMENTAL_H)
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