binutils-gdb/gold/readsyms.h

492 lines
13 KiB
C++

// readsyms.h -- read input file symbols for gold -*- C++ -*-
// Copyright (C) 2006-2017 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"
#include "incremental.h"
namespace gold
{
class Input_objects;
class Symbol_table;
class Input_group;
class Archive;
class Finish_group;
// 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(Input_objects* input_objects, Symbol_table* symtab,
Layout* layout, Dirsearch* dirpath, int dirindex,
Mapfile* mapfile, const Input_argument* input_argument,
Input_group* input_group, Archive_member* member,
Task_token* this_blocker, Task_token* next_blocker)
: input_objects_(input_objects), symtab_(symtab), layout_(layout),
dirpath_(dirpath), dirindex_(dirindex), mapfile_(mapfile),
input_argument_(input_argument), input_group_(input_group),
member_(member), this_blocker_(this_blocker),
next_blocker_(next_blocker)
{ }
~Read_symbols();
// If appropriate, issue a warning about skipping an incompatible
// object.
static void
incompatible_warning(const Input_argument*, const Input_file*);
// Requeue a Read_symbols task to search for the next object with
// the same name.
static void
requeue(Workqueue*, Input_objects*, Symbol_table*, Layout*, Dirsearch*,
int dirindex, Mapfile*, const Input_argument*, Input_group*,
Task_token* next_blocker);
// The standard Task methods.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const;
private:
// Handle an archive group.
void
do_group(Workqueue*);
// Handle --start-lib ... --end-lib
bool
do_lib_group(Workqueue*);
// Handle --whole-archive --start-lib ... --end-lib --no-whole-archive
bool
do_whole_lib_group(Workqueue*);
// Open and identify the file.
bool
do_read_symbols(Workqueue*);
Input_objects* input_objects_;
Symbol_table* symtab_;
Layout* layout_;
Dirsearch* dirpath_;
int dirindex_;
Mapfile* mapfile_;
const Input_argument* input_argument_;
Input_group* input_group_;
Archive_member* member_;
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, Dirsearch* /*dirpath*/, int /*dirindex*/,
Mapfile* /*mapfile*/, const Input_argument* input_argument,
Object* object, Incremental_library* library,
Read_symbols_data* sd, Task_token* this_blocker,
Task_token* next_blocker)
: input_objects_(input_objects), symtab_(symtab), layout_(layout),
input_argument_(input_argument), object_(object), library_(library),
sd_(sd), this_blocker_(this_blocker), next_blocker_(next_blocker)
{ }
~Add_symbols();
// The standard Task methods.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const
{ return "Add_symbols " + this->object_->name(); }
private:
Input_objects* input_objects_;
Symbol_table* symtab_;
Layout* layout_;
const Input_argument* input_argument_;
Object* object_;
Incremental_library* library_;
Read_symbols_data* sd_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
// This Task is responsible for reading the symbols from an archive
// member that has changed since the last incremental link.
class Read_member : public Task
{
public:
// 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_member(Input_objects* /*input_objects*/, Symbol_table* /*symtab*/,
Layout* /*layout*/, Mapfile* /*mapfile*/,
const Incremental_binary::Input_reader* input_reader,
Task_token* this_blocker, Task_token* next_blocker)
: input_reader_(input_reader),
this_blocker_(this_blocker), next_blocker_(next_blocker)
{ }
~Read_member();
// The standard Task methods.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const
{
return (std::string("Read_member ") + this->input_reader_->filename());
}
private:
const Incremental_binary::Input_reader* input_reader_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
// This Task is responsible for processing an input script file that has
// not changed since the last incremental link.
class Check_script : public Task
{
public:
Check_script(Layout* layout, Incremental_binary* ibase,
unsigned int input_file_index,
const Incremental_binary::Input_reader* input_reader,
Task_token* this_blocker, Task_token* next_blocker)
: layout_(layout), ibase_(ibase), input_file_index_(input_file_index),
input_reader_(input_reader), this_blocker_(this_blocker),
next_blocker_(next_blocker)
{
this->filename_ = std::string(this->input_reader_->filename());
}
~Check_script();
// The standard Task methods.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const
{
return (std::string("Check_script ") + this->input_reader_->filename());
}
private:
std::string filename_;
Layout* layout_;
Incremental_binary* ibase_;
unsigned int input_file_index_;
const Incremental_binary::Input_reader* input_reader_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
// This Task is responsible for processing an archive library that has
// not changed since the last incremental link.
class Check_library : public Task
{
public:
Check_library(Symbol_table* /*symtab*/, Layout* layout,
Incremental_binary* ibase,
unsigned int input_file_index,
const Incremental_binary::Input_reader* input_reader,
Task_token* this_blocker, Task_token* next_blocker)
: layout_(layout), ibase_(ibase),
input_file_index_(input_file_index), input_reader_(input_reader),
this_blocker_(this_blocker), next_blocker_(next_blocker)
{ }
~Check_library();
// The standard Task methods.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const
{
return (std::string("Check_library ") + this->input_reader_->filename());
}
private:
Layout* layout_;
Incremental_binary* ibase_;
unsigned int input_file_index_;
const Incremental_binary::Input_reader* input_reader_;
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_()
{ }
~Input_group();
// 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 starts the handling of a group. It exists only to pick
// up the number of undefined symbols at that point, so that we only
// run back through the group if we saw a new undefined symbol.
class Start_group : public Task
{
public:
Start_group(Symbol_table* symtab, Finish_group* finish_group,
Task_token* this_blocker, Task_token* next_blocker)
: symtab_(symtab), finish_group_(finish_group),
this_blocker_(this_blocker), next_blocker_(next_blocker)
{ }
~Start_group();
// The standard Task methods.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const
{ return "Start_group"; }
private:
Symbol_table* symtab_;
Finish_group* finish_group_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
// 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, Mapfile* mapfile, Input_group* input_group,
Task_token* next_blocker)
: input_objects_(input_objects), symtab_(symtab),
layout_(layout), mapfile_(mapfile), input_group_(input_group),
saw_undefined_(0), this_blocker_(NULL), next_blocker_(next_blocker)
{ }
~Finish_group();
// Set the number of undefined symbols when we start processing the
// group. This is called by the Start_group task.
void
set_saw_undefined(size_t saw_undefined)
{ this->saw_undefined_ = saw_undefined; }
// Set the blocker to use for this task.
void
set_blocker(Task_token* this_blocker)
{
gold_assert(this->this_blocker_ == NULL);
this->this_blocker_ = this_blocker;
}
// The standard Task methods.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const
{ return "Finish_group"; }
private:
Input_objects* input_objects_;
Symbol_table* symtab_;
Layout* layout_;
Mapfile* mapfile_;
Input_group* input_group_;
size_t saw_undefined_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
// This class is used to read a file which was not recognized as an
// object or archive. It tries to read it as a linker script, using
// the tokens to serialize with the calls to Add_symbols.
class Read_script : public Task
{
public:
Read_script(Symbol_table* symtab, Layout* layout, Dirsearch* dirpath,
int dirindex, Input_objects* input_objects, Mapfile* mapfile,
Input_group* input_group, const Input_argument* input_argument,
Input_file* input_file, Task_token* this_blocker,
Task_token* next_blocker)
: symtab_(symtab), layout_(layout), dirpath_(dirpath), dirindex_(dirindex),
input_objects_(input_objects), mapfile_(mapfile),
input_group_(input_group), input_argument_(input_argument),
input_file_(input_file), this_blocker_(this_blocker),
next_blocker_(next_blocker)
{ }
~Read_script();
// The standard Task methods.
Task_token*
is_runnable();
void
locks(Task_locker*);
void
run(Workqueue*);
std::string
get_name() const;
private:
Symbol_table* symtab_;
Layout* layout_;
Dirsearch* dirpath_;
int dirindex_;
Input_objects* input_objects_;
Mapfile* mapfile_;
Input_group* input_group_;
const Input_argument* input_argument_;
Input_file* input_file_;
Task_token* this_blocker_;
Task_token* next_blocker_;
};
} // end namespace gold
#endif // !defined(GOLD_READSYMS_H)