492 lines
13 KiB
C++
492 lines
13 KiB
C++
// readsyms.h -- read input file symbols for gold -*- C++ -*-
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// Copyright (C) 2006-2015 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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#ifndef GOLD_READSYMS_H
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#define GOLD_READSYMS_H
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#include <vector>
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#include "workqueue.h"
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#include "object.h"
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#include "incremental.h"
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namespace gold
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{
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class Input_objects;
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class Symbol_table;
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class Input_group;
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class Archive;
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class Finish_group;
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// This Task is responsible for reading the symbols from an input
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// file. This also includes reading the relocations so that we can
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// check for any that require a PLT and/or a GOT. After the data has
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// been read, this queues up another task to actually add the symbols
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// to the symbol table. The tasks are separated because the file
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// reading can occur in parallel but adding the symbols must be done
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// in the order of the input files.
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class Read_symbols : public Task
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{
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public:
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// DIRPATH is the list of directories to search for libraries.
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// INPUT is the file to read. INPUT_GROUP is not NULL if we are in
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// the middle of an input group. THIS_BLOCKER is used to prevent
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// the associated Add_symbols task from running before the previous
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// one has completed; it will be NULL for the first task.
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// NEXT_BLOCKER is used to block the next input file from adding
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// symbols.
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Read_symbols(Input_objects* input_objects, Symbol_table* symtab,
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Layout* layout, Dirsearch* dirpath, int dirindex,
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Mapfile* mapfile, const Input_argument* input_argument,
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Input_group* input_group, Archive_member* member,
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Task_token* this_blocker, Task_token* next_blocker)
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: input_objects_(input_objects), symtab_(symtab), layout_(layout),
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dirpath_(dirpath), dirindex_(dirindex), mapfile_(mapfile),
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input_argument_(input_argument), input_group_(input_group),
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member_(member), this_blocker_(this_blocker),
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next_blocker_(next_blocker)
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{ }
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~Read_symbols();
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// If appropriate, issue a warning about skipping an incompatible
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// object.
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static void
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incompatible_warning(const Input_argument*, const Input_file*);
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// Requeue a Read_symbols task to search for the next object with
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// the same name.
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static void
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requeue(Workqueue*, Input_objects*, Symbol_table*, Layout*, Dirsearch*,
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int dirindex, Mapfile*, const Input_argument*, Input_group*,
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Task_token* next_blocker);
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const;
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private:
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// Handle an archive group.
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void
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do_group(Workqueue*);
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// Handle --start-lib ... --end-lib
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bool
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do_lib_group(Workqueue*);
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// Handle --whole-archive --start-lib ... --end-lib --no-whole-archive
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bool
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do_whole_lib_group(Workqueue*);
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// Open and identify the file.
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bool
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do_read_symbols(Workqueue*);
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Input_objects* input_objects_;
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Symbol_table* symtab_;
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Layout* layout_;
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Dirsearch* dirpath_;
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int dirindex_;
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Mapfile* mapfile_;
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const Input_argument* input_argument_;
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Input_group* input_group_;
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Archive_member* member_;
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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// This Task handles adding the symbols to the symbol table. These
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// tasks must be run in the same order as the arguments appear on the
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// command line.
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class Add_symbols : public Task
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{
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public:
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// THIS_BLOCKER is used to prevent this task from running before the
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// one for the previous input file. NEXT_BLOCKER is used to prevent
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// the next task from running.
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Add_symbols(Input_objects* input_objects, Symbol_table* symtab,
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Layout* layout, Dirsearch* /*dirpath*/, int /*dirindex*/,
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Mapfile* /*mapfile*/, const Input_argument* input_argument,
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Object* object, Incremental_library* library,
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Read_symbols_data* sd, Task_token* this_blocker,
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Task_token* next_blocker)
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: input_objects_(input_objects), symtab_(symtab), layout_(layout),
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input_argument_(input_argument), object_(object), library_(library),
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sd_(sd), this_blocker_(this_blocker), next_blocker_(next_blocker)
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{ }
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~Add_symbols();
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const
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{ return "Add_symbols " + this->object_->name(); }
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private:
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Input_objects* input_objects_;
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Symbol_table* symtab_;
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Layout* layout_;
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const Input_argument* input_argument_;
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Object* object_;
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Incremental_library* library_;
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Read_symbols_data* sd_;
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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// This Task is responsible for reading the symbols from an archive
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// member that has changed since the last incremental link.
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class Read_member : public Task
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{
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public:
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// INPUT is the file to read. INPUT_GROUP is not NULL if we are in
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// the middle of an input group. THIS_BLOCKER is used to prevent
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// the associated Add_symbols task from running before the previous
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// one has completed; it will be NULL for the first task.
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// NEXT_BLOCKER is used to block the next input file from adding
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// symbols.
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Read_member(Input_objects* /*input_objects*/, Symbol_table* /*symtab*/,
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Layout* /*layout*/, Mapfile* /*mapfile*/,
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const Incremental_binary::Input_reader* input_reader,
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Task_token* this_blocker, Task_token* next_blocker)
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: input_reader_(input_reader),
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this_blocker_(this_blocker), next_blocker_(next_blocker)
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{ }
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~Read_member();
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const
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{
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return (std::string("Read_member ") + this->input_reader_->filename());
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}
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private:
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const Incremental_binary::Input_reader* input_reader_;
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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// This Task is responsible for processing an input script file that has
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// not changed since the last incremental link.
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class Check_script : public Task
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{
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public:
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Check_script(Layout* layout, Incremental_binary* ibase,
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unsigned int input_file_index,
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const Incremental_binary::Input_reader* input_reader,
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Task_token* this_blocker, Task_token* next_blocker)
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: layout_(layout), ibase_(ibase), input_file_index_(input_file_index),
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input_reader_(input_reader), this_blocker_(this_blocker),
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next_blocker_(next_blocker)
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{
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this->filename_ = std::string(this->input_reader_->filename());
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}
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~Check_script();
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const
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{
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return (std::string("Check_script ") + this->input_reader_->filename());
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}
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private:
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std::string filename_;
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Layout* layout_;
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Incremental_binary* ibase_;
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unsigned int input_file_index_;
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const Incremental_binary::Input_reader* input_reader_;
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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// This Task is responsible for processing an archive library that has
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// not changed since the last incremental link.
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class Check_library : public Task
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{
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public:
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Check_library(Symbol_table* /*symtab*/, Layout* layout,
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Incremental_binary* ibase,
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unsigned int input_file_index,
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const Incremental_binary::Input_reader* input_reader,
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Task_token* this_blocker, Task_token* next_blocker)
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: layout_(layout), ibase_(ibase),
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input_file_index_(input_file_index), input_reader_(input_reader),
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this_blocker_(this_blocker), next_blocker_(next_blocker)
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{ }
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~Check_library();
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const
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{
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return (std::string("Check_library ") + this->input_reader_->filename());
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}
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private:
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Layout* layout_;
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Incremental_binary* ibase_;
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unsigned int input_file_index_;
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const Incremental_binary::Input_reader* input_reader_;
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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// This class is used to track the archives in a group.
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class Input_group
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{
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public:
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typedef std::vector<Archive*> Archives;
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typedef Archives::const_iterator const_iterator;
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Input_group()
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: archives_()
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{ }
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~Input_group();
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// Add an archive to the group.
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void
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add_archive(Archive* arch)
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{ this->archives_.push_back(arch); }
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// Loop over the archives in the group.
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const_iterator
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begin() const
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{ return this->archives_.begin(); }
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const_iterator
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end() const
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{ return this->archives_.end(); }
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private:
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Archives archives_;
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};
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// This class starts the handling of a group. It exists only to pick
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// up the number of undefined symbols at that point, so that we only
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// run back through the group if we saw a new undefined symbol.
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class Start_group : public Task
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{
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public:
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Start_group(Symbol_table* symtab, Finish_group* finish_group,
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Task_token* this_blocker, Task_token* next_blocker)
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: symtab_(symtab), finish_group_(finish_group),
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this_blocker_(this_blocker), next_blocker_(next_blocker)
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{ }
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~Start_group();
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const
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{ return "Start_group"; }
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private:
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Symbol_table* symtab_;
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Finish_group* finish_group_;
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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// This class is used to finish up handling a group. It is just a
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// closure.
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class Finish_group : public Task
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{
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public:
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Finish_group(Input_objects* input_objects, Symbol_table* symtab,
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Layout* layout, Mapfile* mapfile, Input_group* input_group,
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Task_token* next_blocker)
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: input_objects_(input_objects), symtab_(symtab),
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layout_(layout), mapfile_(mapfile), input_group_(input_group),
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saw_undefined_(0), this_blocker_(NULL), next_blocker_(next_blocker)
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{ }
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~Finish_group();
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// Set the number of undefined symbols when we start processing the
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// group. This is called by the Start_group task.
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void
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set_saw_undefined(size_t saw_undefined)
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{ this->saw_undefined_ = saw_undefined; }
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// Set the blocker to use for this task.
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void
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set_blocker(Task_token* this_blocker)
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{
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gold_assert(this->this_blocker_ == NULL);
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this->this_blocker_ = this_blocker;
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}
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const
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{ return "Finish_group"; }
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private:
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Input_objects* input_objects_;
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Symbol_table* symtab_;
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Layout* layout_;
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Mapfile* mapfile_;
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Input_group* input_group_;
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size_t saw_undefined_;
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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// This class is used to read a file which was not recognized as an
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// object or archive. It tries to read it as a linker script, using
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// the tokens to serialize with the calls to Add_symbols.
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class Read_script : public Task
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{
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public:
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Read_script(Symbol_table* symtab, Layout* layout, Dirsearch* dirpath,
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int dirindex, Input_objects* input_objects, Mapfile* mapfile,
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Input_group* input_group, const Input_argument* input_argument,
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Input_file* input_file, Task_token* this_blocker,
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Task_token* next_blocker)
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: symtab_(symtab), layout_(layout), dirpath_(dirpath), dirindex_(dirindex),
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input_objects_(input_objects), mapfile_(mapfile),
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input_group_(input_group), input_argument_(input_argument),
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input_file_(input_file), this_blocker_(this_blocker),
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next_blocker_(next_blocker)
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{ }
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~Read_script();
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// The standard Task methods.
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Task_token*
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is_runnable();
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void
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locks(Task_locker*);
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void
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run(Workqueue*);
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std::string
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get_name() const;
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private:
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Symbol_table* symtab_;
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Layout* layout_;
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Dirsearch* dirpath_;
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int dirindex_;
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Input_objects* input_objects_;
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Mapfile* mapfile_;
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Input_group* input_group_;
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const Input_argument* input_argument_;
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Input_file* input_file_;
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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} // end namespace gold
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#endif // !defined(GOLD_READSYMS_H)
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