2006-12-01 00:52:50 +01:00
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// gold.cc -- main linker functions
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2006-08-05 01:10:59 +02:00
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2009-01-28 03:25:33 +01:00
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// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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2007-09-22 23:02:10 +02:00
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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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2006-08-05 01:10:59 +02:00
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#include "gold.h"
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#include <cstdlib>
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#include <cstdio>
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#include <cstring>
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#include <unistd.h>
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2008-02-06 21:32:10 +01:00
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#include <algorithm>
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2007-10-14 08:49:14 +02:00
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#include "libiberty.h"
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2006-08-05 01:10:59 +02:00
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#include "options.h"
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2008-01-23 02:31:13 +01:00
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#include "debug.h"
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2006-08-05 01:10:59 +02:00
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#include "workqueue.h"
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#include "dirsearch.h"
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#include "readsyms.h"
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2006-08-19 00:29:20 +02:00
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#include "symtab.h"
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2006-11-03 19:26:11 +01:00
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#include "common.h"
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2006-09-26 23:00:34 +02:00
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#include "object.h"
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2006-09-22 00:13:18 +02:00
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#include "layout.h"
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2006-09-29 21:58:17 +02:00
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#include "reloc.h"
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2006-11-03 19:26:11 +01:00
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#include "defstd.h"
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2008-09-20 00:54:57 +02:00
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#include "plugin.h"
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2009-08-05 22:51:56 +02:00
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#include "icf.h"
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2009-09-01 19:32:35 +02:00
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#include "incremental.h"
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2006-08-05 01:10:59 +02:00
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namespace gold
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{
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const char* program_name;
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void
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gold_exit(bool status)
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{
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2008-12-24 07:17:18 +01:00
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if (parameters != NULL
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&& parameters->options_valid()
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&& parameters->options().has_plugins())
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parameters->options().plugins()->cleanup();
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2007-11-28 20:39:40 +01:00
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if (!status && parameters != NULL && parameters->options_valid())
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2008-02-28 01:18:24 +01:00
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unlink_if_ordinary(parameters->options().output_file_name());
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2006-08-05 01:10:59 +02:00
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exit(status ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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void
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gold_nomem()
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{
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// We are out of memory, so try hard to print a reasonable message.
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// Note that we don't try to translate this message, since the
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// translation process itself will require memory.
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2008-05-09 16:13:06 +02:00
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// LEN only exists to avoid a pointless warning when write is
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// declared with warn_use_result, as when compiling with
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// -D_USE_FORTIFY on GNU/Linux. Casting to void does not appear to
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// work, at least not with gcc 4.3.0.
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ssize_t len = write(2, program_name, strlen(program_name));
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if (len >= 0)
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{
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const char* const s = ": out of memory\n";
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len = write(2, s, strlen(s));
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}
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2006-08-05 01:10:59 +02:00
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gold_exit(false);
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}
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2006-11-29 18:56:40 +01:00
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// Handle an unreachable case.
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2006-08-05 01:10:59 +02:00
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void
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2006-11-29 18:56:40 +01:00
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do_gold_unreachable(const char* filename, int lineno, const char* function)
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2006-08-05 01:10:59 +02:00
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{
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2007-10-14 06:06:18 +02:00
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fprintf(stderr, _("%s: internal error in %s, at %s:%d\n"),
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2006-11-29 18:56:40 +01:00
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program_name, function, filename, lineno);
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gold_exit(false);
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2006-08-05 01:10:59 +02:00
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}
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2006-10-20 22:40:49 +02:00
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// This class arranges to run the functions done in the middle of the
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// link. It is just a closure.
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2006-08-05 01:10:59 +02:00
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2006-10-20 22:40:49 +02:00
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class Middle_runner : public Task_function_runner
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2006-08-05 01:10:59 +02:00
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{
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2006-10-20 22:40:49 +02:00
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public:
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Middle_runner(const General_options& options,
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const Input_objects* input_objects,
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Symbol_table* symtab,
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2008-05-21 23:37:44 +02:00
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Layout* layout, Mapfile* mapfile)
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2006-10-20 22:40:49 +02:00
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: options_(options), input_objects_(input_objects), symtab_(symtab),
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2008-05-21 23:37:44 +02:00
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layout_(layout), mapfile_(mapfile)
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2006-10-20 22:40:49 +02:00
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{ }
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void
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2007-12-14 20:00:21 +01:00
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run(Workqueue*, const Task*);
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2006-10-20 22:40:49 +02:00
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private:
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const General_options& options_;
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const Input_objects* input_objects_;
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Symbol_table* symtab_;
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Layout* layout_;
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2008-05-21 23:37:44 +02:00
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Mapfile* mapfile_;
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2006-10-20 22:40:49 +02:00
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};
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2006-08-05 01:10:59 +02:00
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2006-10-20 22:40:49 +02:00
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void
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2007-12-14 20:00:21 +01:00
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Middle_runner::run(Workqueue* workqueue, const Task* task)
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2006-10-20 22:40:49 +02:00
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{
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2007-12-14 20:00:21 +01:00
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queue_middle_tasks(this->options_, task, this->input_objects_, this->symtab_,
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2008-05-21 23:37:44 +02:00
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this->layout_, workqueue, this->mapfile_);
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2006-10-20 22:40:49 +02:00
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}
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2006-08-05 01:10:59 +02:00
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2009-01-28 03:25:33 +01:00
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// This class arranges the tasks to process the relocs for garbage collection.
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class Gc_runner : public Task_function_runner
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{
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public:
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Gc_runner(const General_options& options,
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const Input_objects* input_objects,
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Symbol_table* symtab,
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Layout* layout, Mapfile* mapfile)
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: options_(options), input_objects_(input_objects), symtab_(symtab),
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layout_(layout), mapfile_(mapfile)
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{ }
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void
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run(Workqueue*, const Task*);
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private:
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const General_options& options_;
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const 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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};
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void
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Gc_runner::run(Workqueue* workqueue, const Task* task)
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{
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queue_middle_gc_tasks(this->options_, task, this->input_objects_,
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this->symtab_, this->layout_, workqueue,
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this->mapfile_);
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}
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2006-08-05 01:10:59 +02:00
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// Queue up the initial set of tasks for this link job.
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void
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queue_initial_tasks(const General_options& options,
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2007-12-14 20:00:21 +01:00
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Dirsearch& search_path,
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2006-11-03 19:26:11 +01:00
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const Command_line& cmdline,
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2006-09-26 23:00:34 +02:00
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Workqueue* workqueue, Input_objects* input_objects,
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2008-05-21 23:37:44 +02:00
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Symbol_table* symtab, Layout* layout, Mapfile* mapfile)
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2006-08-05 01:10:59 +02:00
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{
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2007-10-27 00:27:52 +02:00
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if (cmdline.begin() == cmdline.end())
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2009-06-24 07:01:17 +02:00
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{
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if (options.printed_version())
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gold_exit(true);
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gold_fatal(_("no input files"));
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}
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2007-10-27 00:27:52 +02:00
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2007-10-17 08:24:50 +02:00
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int thread_count = options.thread_count_initial();
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if (thread_count == 0)
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2007-10-27 00:27:52 +02:00
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thread_count = cmdline.number_of_input_files();
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2007-10-17 08:24:50 +02:00
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workqueue->set_thread_count(thread_count);
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2009-09-01 19:32:35 +02:00
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if (cmdline.options().incremental())
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{
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Incremental_checker incremental_checker(
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parameters->options().output_file_name());
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if (incremental_checker.can_incrementally_link_output_file())
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{
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// TODO: remove when incremental linking implemented.
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printf("Incremental linking might be possible "
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"(not implemented yet)\n");
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}
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// TODO: If we decide on an incremental build, fewer tasks
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// should be scheduled.
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}
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2006-08-05 01:10:59 +02:00
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// Read the input files. We have to add the symbols to the symbol
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// table in order. We do this by creating a separate blocker for
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// each input file. We associate the blocker with the following
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// input file, to give us a convenient place to delete it.
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Task_token* this_blocker = NULL;
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2006-11-03 19:26:11 +01:00
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for (Command_line::const_iterator p = cmdline.begin();
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p != cmdline.end();
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2006-08-05 01:10:59 +02:00
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++p)
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{
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2007-12-14 20:00:21 +01:00
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Task_token* next_blocker = new Task_token(true);
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2006-08-05 01:10:59 +02:00
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next_blocker->add_blocker();
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2009-03-13 22:30:06 +01:00
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workqueue->queue(new Read_symbols(input_objects, symtab, layout,
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* readsyms.cc (Read_symbols::incompatible_warning): New function.
(Read_symbols::requeue): New function.
(Read_symbols::do_read_symbols): If make_elf_object fails because
the target type is not configured, and the file was searched for,
issue a warning and retry with the next directory.
(Add_symbols::run): If the file has an incompatible format, and
it was searched for, requeue the Read_symbols task. On error,
release the object.
* readsyms.h (class Read_symbols): Add dirindex_ field. Add
dirindex parameter to constructor. Change all callers. Declare
incompatible_warning and requeue.
(class Add_symbols): Add dirpath_, dirindex_, mapfile_,
input_argument_ and input_group_ fields. Add them to
constructor. Change all callers.
(class Read_script): Add dirindex_ field. Add it to constructor.
Change all callers.
* archive.cc (Archive::setup): Remove input_objects parameter.
Change all callers.
(Archive::get_file_and_offset): Likewise.
(Archive::read_all_symbols): Likewise.
(Archive::read_symbols): Likewise.
(Archive::get_elf_object_for_member): Remove input_objects
parameter. Add punconfigured parameter. Change all callers.
(Archive::add_symbols): Change return type to bool. Check return
value of include_member.
(Archive::include_all_members): Likewise.
(Archive::include_member): Change return type to bool. Return
false if first included object has incompatible target. Set
included_member_ field.
(Add_archive_symbols::run): If add_symbols returns false, requeue
Read_symbols task.
* archive.h (class Archive): Add included_member_ field.
Initialize it in constructor. Add input_file and searched_for
methods. Update declarations.
(class Add_archive_symbols): Add dirpath_, dirindex_, and
input_argument_ fields. Add them to constructor. Change all
callers.
* script.cc: Include "target-select.h".
(class Parser_closure): Add skip_on_incompatible_target_ and
found_incompatible_target_ fields. Add
skip_on_incompatible_target parameter to constructor. Change all
callers. Add methods skip_on_incompatible_target,
clear_skip_on_incompatible_target, found_incompatible_target, and
set_found_incompatible_target.
(read_input_script): Add dirindex parameter. Change all callers.
If parser finds an incompatible target, requeue Read_symbols
task.
(script_set_symbol): Clear skip_on_incompatible_target in
closure.
(script_add_assertion, script_parse_option): Likewise.
(script_start_sections, script_add_phdr): Likewise.
(script_check_output_format): New function.
* script.h (read_input_script): Update declaration.
* script-c.h (script_check_output_format): Declare.
* yyscript.y (file_cmd): Handle OUTPUT_FORMAT.
(ignore_cmd): Remove OUTPUT_FORMAT.
* fileread.cc (Input_file::Input_file): Add explicit this.
(Input_file::will_search_for): New function.
(Input_file::open): Add pindex parameter. Change all callers.
* fileread.h (class Input_file): Add input_file_argument method.
Declare will_search_for. Update declarations.
* object.cc (make_elf_object): Add punconfigured parameter.
Change all callers.
* object.h (class Object): Make input_file public. Add
searched_for method.
(make_elf_object): Update declaration.
* dirsearch.cc (Dirsearch::find): Add pindex parameter. Use it to
restart search.
* dirsearch.h (class Dirsearch): Update declaration.
* options.h (class General_options): Add --warn-search-mismatch.
* parameters.cc (Parameters::is_compatible_target): New function.
* parameters.h (class Parameters): Declare is_compatible_target.
* workqueue.cc (Workqueue::add_blocker): New function.
* workqueue.h (class Workqueue): Declare add_blocker.
2009-03-14 06:56:46 +01:00
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&search_path, 0, mapfile, &*p, NULL,
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2008-05-21 23:37:44 +02:00
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this_blocker, next_blocker));
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2006-08-05 01:10:59 +02:00
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this_blocker = next_blocker;
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}
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2008-09-20 00:54:57 +02:00
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if (options.has_plugins())
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{
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Task_token* next_blocker = new Task_token(true);
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next_blocker->add_blocker();
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workqueue->queue(new Plugin_hook(options, input_objects, symtab, layout,
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&search_path, mapfile, this_blocker,
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next_blocker));
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this_blocker = next_blocker;
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}
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2009-01-28 03:25:33 +01:00
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if (parameters->options().relocatable()
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2009-08-05 22:51:56 +02:00
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&& (parameters->options().gc_sections() || parameters->options().icf()))
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gold_error(_("cannot mix -r with --gc-sections or --icf"));
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2009-01-28 03:25:33 +01:00
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2009-08-05 22:51:56 +02:00
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if (parameters->options().gc_sections() || parameters->options().icf())
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2009-01-28 03:25:33 +01:00
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{
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workqueue->queue(new Task_function(new Gc_runner(options,
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input_objects,
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symtab,
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layout,
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mapfile),
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this_blocker,
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"Task_function Gc_runner"));
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}
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else
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{
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workqueue->queue(new Task_function(new Middle_runner(options,
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input_objects,
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symtab,
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layout,
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mapfile),
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this_blocker,
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"Task_function Middle_runner"));
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}
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}
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2009-09-01 19:32:35 +02:00
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// Queue up a set of tasks to be done before queueing the middle set
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// of tasks. This is only necessary when garbage collection
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2009-01-28 03:25:33 +01:00
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// (--gc-sections) of unused sections is desired. The relocs are read
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// and processed here early to determine the garbage sections before the
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// relocs can be scanned in later tasks.
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void
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queue_middle_gc_tasks(const General_options& options,
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const Task* ,
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const Input_objects* input_objects,
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Symbol_table* symtab,
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Layout* layout,
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Workqueue* workqueue,
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Mapfile* mapfile)
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{
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// Read_relocs for all the objects must be done and processed to find
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// unused sections before any scanning of the relocs can take place.
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Task_token* blocker = new Task_token(true);
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Task_token* symtab_lock = new Task_token(false);
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for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
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p != input_objects->relobj_end();
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++p)
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{
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|
|
// We can read and process the relocations in any order.
|
|
|
|
blocker->add_blocker();
|
|
|
|
workqueue->queue(new Read_relocs(options, symtab, layout, *p,
|
|
|
|
symtab_lock, blocker));
|
|
|
|
}
|
|
|
|
|
|
|
|
Task_token* this_blocker = new Task_token(true);
|
2006-10-20 22:40:49 +02:00
|
|
|
workqueue->queue(new Task_function(new Middle_runner(options,
|
2009-01-28 03:25:33 +01:00
|
|
|
input_objects,
|
|
|
|
symtab,
|
|
|
|
layout,
|
|
|
|
mapfile),
|
|
|
|
this_blocker,
|
|
|
|
"Task_function Middle_runner"));
|
2006-08-05 01:10:59 +02:00
|
|
|
}
|
|
|
|
|
2006-10-20 22:40:49 +02:00
|
|
|
// Queue up the middle set of tasks. These are the tasks which run
|
|
|
|
// after all the input objects have been found and all the symbols
|
|
|
|
// have been read, but before we lay out the output file.
|
2006-08-05 01:10:59 +02:00
|
|
|
|
2006-10-20 22:40:49 +02:00
|
|
|
void
|
|
|
|
queue_middle_tasks(const General_options& options,
|
2007-12-14 20:00:21 +01:00
|
|
|
const Task* task,
|
2006-10-20 22:40:49 +02:00
|
|
|
const Input_objects* input_objects,
|
|
|
|
Symbol_table* symtab,
|
|
|
|
Layout* layout,
|
2008-05-21 23:37:44 +02:00
|
|
|
Workqueue* workqueue,
|
|
|
|
Mapfile* mapfile)
|
2006-09-29 21:58:17 +02:00
|
|
|
{
|
2009-01-28 03:25:33 +01:00
|
|
|
// Add any symbols named with -u options to the symbol table.
|
|
|
|
symtab->add_undefined_symbols_from_command_line();
|
|
|
|
|
|
|
|
// If garbage collection was chosen, relocs have been read and processed
|
|
|
|
// at this point by pre_middle_tasks. Layout can then be done for all
|
|
|
|
// objects.
|
|
|
|
if (parameters->options().gc_sections())
|
|
|
|
{
|
|
|
|
// Find the start symbol if any.
|
|
|
|
Symbol* start_sym;
|
|
|
|
if (parameters->options().entry())
|
|
|
|
start_sym = symtab->lookup(parameters->options().entry());
|
|
|
|
else
|
|
|
|
start_sym = symtab->lookup("_start");
|
|
|
|
if (start_sym !=NULL)
|
|
|
|
{
|
|
|
|
bool is_ordinary;
|
|
|
|
unsigned int shndx = start_sym->shndx(&is_ordinary);
|
|
|
|
if (is_ordinary)
|
|
|
|
{
|
|
|
|
symtab->gc()->worklist().push(
|
|
|
|
Section_id(start_sym->object(), shndx));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// Symbols named with -u should not be considered garbage.
|
|
|
|
symtab->gc_mark_undef_symbols();
|
|
|
|
gold_assert(symtab->gc() != NULL);
|
|
|
|
// Do a transitive closure on all references to determine the worklist.
|
|
|
|
symtab->gc()->do_transitive_closure();
|
2009-08-05 22:51:56 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
// If identical code folding (--icf) is chosen it makes sense to do it
|
|
|
|
// only after garbage collection (--gc-sections) as we do not want to
|
|
|
|
// be folding sections that will be garbage.
|
|
|
|
if (parameters->options().icf())
|
|
|
|
{
|
|
|
|
symtab->icf()->find_identical_sections(input_objects, symtab);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Call Object::layout for the second time to determine the
|
|
|
|
// output_sections for all referenced input sections. When
|
|
|
|
// --gc-sections or --icf is turned on, Object::layout is
|
|
|
|
// called twice. It is called the first time when the
|
|
|
|
// symbols are added.
|
|
|
|
if (parameters->options().gc_sections() || parameters->options().icf())
|
|
|
|
{
|
2009-01-28 03:25:33 +01:00
|
|
|
for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
|
|
|
|
p != input_objects->relobj_end();
|
|
|
|
++p)
|
|
|
|
{
|
|
|
|
(*p)->layout(symtab, layout, NULL);
|
|
|
|
}
|
|
|
|
}
|
2009-08-05 22:51:56 +02:00
|
|
|
|
2009-01-28 03:25:33 +01:00
|
|
|
// Layout deferred objects due to plugins.
|
|
|
|
if (parameters->options().has_plugins())
|
|
|
|
{
|
|
|
|
Plugin_manager* plugins = parameters->options().plugins();
|
|
|
|
gold_assert(plugins != NULL);
|
|
|
|
plugins->layout_deferred_objects();
|
|
|
|
}
|
2009-08-05 22:51:56 +02:00
|
|
|
|
|
|
|
if (parameters->options().gc_sections() || parameters->options().icf())
|
2009-01-28 03:25:33 +01:00
|
|
|
{
|
|
|
|
for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
|
|
|
|
p != input_objects->relobj_end();
|
|
|
|
++p)
|
|
|
|
{
|
|
|
|
// Update the value of output_section stored in rd.
|
|
|
|
Read_relocs_data *rd = (*p)->get_relocs_data();
|
|
|
|
for (Read_relocs_data::Relocs_list::iterator q = rd->relocs.begin();
|
|
|
|
q != rd->relocs.end();
|
|
|
|
++q)
|
|
|
|
{
|
|
|
|
q->output_section = (*p)->output_section(q->data_shndx);
|
|
|
|
q->needs_special_offset_handling =
|
|
|
|
(*p)->is_output_section_offset_invalid(q->data_shndx);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-02-06 21:32:10 +01:00
|
|
|
// We have to support the case of not seeing any input objects, and
|
|
|
|
// generate an empty file. Existing builds depend on being able to
|
|
|
|
// pass an empty archive to the linker and get an empty object file
|
|
|
|
// out. In order to do this we need to use a default target.
|
2007-10-27 00:12:03 +02:00
|
|
|
if (input_objects->number_of_input_objects() == 0)
|
2008-02-28 01:18:24 +01:00
|
|
|
set_parameters_target(¶meters->default_target());
|
2007-10-27 00:12:03 +02:00
|
|
|
|
2007-10-17 08:24:50 +02:00
|
|
|
int thread_count = options.thread_count_middle();
|
|
|
|
if (thread_count == 0)
|
2008-02-06 21:32:10 +01:00
|
|
|
thread_count = std::max(2, input_objects->number_of_input_objects());
|
2007-10-17 08:24:50 +02:00
|
|
|
workqueue->set_thread_count(thread_count);
|
|
|
|
|
2007-09-28 08:36:25 +02:00
|
|
|
// Now we have seen all the input files.
|
2007-10-17 01:23:08 +02:00
|
|
|
const bool doing_static_link = (!input_objects->any_dynamic()
|
2008-02-28 01:18:24 +01:00
|
|
|
&& !parameters->options().shared());
|
2007-10-14 04:52:13 +02:00
|
|
|
set_parameters_doing_static_link(doing_static_link);
|
|
|
|
if (!doing_static_link && options.is_static())
|
|
|
|
{
|
|
|
|
// We print out just the first .so we see; there may be others.
|
2008-10-08 01:40:21 +02:00
|
|
|
gold_assert(input_objects->dynobj_begin() != input_objects->dynobj_end());
|
2007-10-14 08:49:14 +02:00
|
|
|
gold_error(_("cannot mix -static with dynamic object %s"),
|
|
|
|
(*input_objects->dynobj_begin())->name().c_str());
|
2007-10-14 04:52:13 +02:00
|
|
|
}
|
2008-02-28 01:18:24 +01:00
|
|
|
if (!doing_static_link && parameters->options().relocatable())
|
2009-06-24 07:01:17 +02:00
|
|
|
gold_fatal(_("cannot mix -r with dynamic object %s"),
|
2008-02-06 09:13:50 +01:00
|
|
|
(*input_objects->dynobj_begin())->name().c_str());
|
2008-02-07 08:33:46 +01:00
|
|
|
if (!doing_static_link
|
2008-03-04 19:21:43 +01:00
|
|
|
&& options.oformat_enum() != General_options::OBJECT_FORMAT_ELF)
|
2008-02-07 08:33:46 +01:00
|
|
|
gold_fatal(_("cannot use non-ELF output format with dynamic object %s"),
|
|
|
|
(*input_objects->dynobj_begin())->name().c_str());
|
2007-09-28 08:36:25 +02:00
|
|
|
|
2008-01-23 02:31:13 +01:00
|
|
|
if (is_debugging_enabled(DEBUG_SCRIPT))
|
|
|
|
layout->script_options()->print(stderr);
|
|
|
|
|
2007-11-14 08:34:53 +01:00
|
|
|
// For each dynamic object, record whether we've seen all the
|
|
|
|
// dynamic objects that it depends upon.
|
|
|
|
input_objects->check_dynamic_dependencies();
|
|
|
|
|
2007-11-13 21:02:32 +01:00
|
|
|
// See if any of the input definitions violate the One Definition Rule.
|
|
|
|
// TODO: if this is too slow, do this as a task, rather than inline.
|
2007-12-14 20:00:21 +01:00
|
|
|
symtab->detect_odr_violations(task, options.output_file_name());
|
2007-11-13 21:02:32 +01:00
|
|
|
|
2009-06-24 21:48:51 +02:00
|
|
|
// Create any automatic note sections.
|
|
|
|
layout->create_notes();
|
|
|
|
|
2008-02-28 05:45:47 +01:00
|
|
|
// Create any output sections required by any linker script.
|
|
|
|
layout->create_script_sections();
|
|
|
|
|
2006-11-29 18:56:40 +01:00
|
|
|
// Define some sections and symbols needed for a dynamic link. This
|
|
|
|
// handles some cases we want to see before we read the relocs.
|
2008-01-26 02:17:45 +01:00
|
|
|
layout->create_initial_dynamic_sections(symtab);
|
2006-11-29 18:56:40 +01:00
|
|
|
|
2008-02-04 06:43:05 +01:00
|
|
|
// Define symbols from any linker scripts.
|
|
|
|
layout->define_script_symbols(symtab);
|
|
|
|
|
2008-04-15 06:06:41 +02:00
|
|
|
// Attach sections to segments.
|
|
|
|
layout->attach_sections_to_segments();
|
|
|
|
|
2008-02-28 01:18:24 +01:00
|
|
|
if (!parameters->options().relocatable())
|
2008-02-06 09:13:50 +01:00
|
|
|
{
|
|
|
|
// Predefine standard symbols.
|
|
|
|
define_standard_symbols(symtab, layout);
|
2006-11-03 19:26:11 +01:00
|
|
|
|
2008-02-06 09:13:50 +01:00
|
|
|
// Define __start and __stop symbols for output sections where
|
|
|
|
// appropriate.
|
|
|
|
layout->define_section_symbols(symtab);
|
|
|
|
}
|
2007-09-22 06:42:09 +02:00
|
|
|
|
2008-02-06 20:32:32 +01:00
|
|
|
// Make sure we have symbols for any required group signatures.
|
|
|
|
layout->define_group_signatures(symtab);
|
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
Task_token* blocker = new Task_token(true);
|
|
|
|
Task_token* symtab_lock = new Task_token(false);
|
2009-01-28 03:25:33 +01:00
|
|
|
|
|
|
|
// If doing garbage collection, the relocations have already been read.
|
|
|
|
// Otherwise, read and scan the relocations.
|
2009-08-05 22:51:56 +02:00
|
|
|
if (parameters->options().gc_sections() || parameters->options().icf())
|
2006-10-20 22:40:49 +02:00
|
|
|
{
|
2009-01-28 03:25:33 +01:00
|
|
|
for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
|
|
|
|
p != input_objects->relobj_end();
|
|
|
|
++p)
|
|
|
|
{
|
|
|
|
blocker->add_blocker();
|
|
|
|
workqueue->queue(new Scan_relocs(options, symtab, layout, *p,
|
|
|
|
(*p)->get_relocs_data(),symtab_lock, blocker));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
// Read the relocations of the input files. We do this to find
|
|
|
|
// which symbols are used by relocations which require a GOT and/or
|
|
|
|
// a PLT entry, or a COPY reloc. When we implement garbage
|
|
|
|
// collection we will do it here by reading the relocations in a
|
|
|
|
// breadth first search by references.
|
|
|
|
//
|
|
|
|
// We could also read the relocations during the first pass, and
|
|
|
|
// mark symbols at that time. That is how the old GNU linker works.
|
|
|
|
// Doing that is more complex, since we may later decide to discard
|
|
|
|
// some of the sections, and thus change our minds about the types
|
|
|
|
// of references made to the symbols.
|
|
|
|
for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
|
|
|
|
p != input_objects->relobj_end();
|
|
|
|
++p)
|
|
|
|
{
|
|
|
|
// We can read and process the relocations in any order. But we
|
|
|
|
// only want one task to write to the symbol table at a time.
|
|
|
|
// So we queue up a task for each object to read the
|
|
|
|
// relocations. That task will in turn queue a task to wait
|
|
|
|
// until it can write to the symbol table.
|
|
|
|
blocker->add_blocker();
|
|
|
|
workqueue->queue(new Read_relocs(options, symtab, layout, *p,
|
|
|
|
symtab_lock, blocker));
|
|
|
|
}
|
2006-10-20 22:40:49 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
// Allocate common symbols. This requires write access to the
|
|
|
|
// symbol table, but is independent of the relocation processing.
|
2008-02-28 21:35:39 +01:00
|
|
|
if (parameters->options().define_common())
|
2008-02-06 09:13:50 +01:00
|
|
|
{
|
|
|
|
blocker->add_blocker();
|
2008-05-21 23:37:44 +02:00
|
|
|
workqueue->queue(new Allocate_commons_task(symtab, layout, mapfile,
|
|
|
|
symtab_lock, blocker));
|
2008-02-06 09:13:50 +01:00
|
|
|
}
|
2006-10-20 22:40:49 +02:00
|
|
|
|
|
|
|
// When all those tasks are complete, we can start laying out the
|
|
|
|
// output file.
|
2008-02-28 01:18:24 +01:00
|
|
|
// TODO(csilvers): figure out a more principled way to get the target
|
|
|
|
Target* target = const_cast<Target*>(¶meters->target());
|
2006-10-20 22:40:49 +02:00
|
|
|
workqueue->queue(new Task_function(new Layout_task_runner(options,
|
|
|
|
input_objects,
|
|
|
|
symtab,
|
2008-02-28 01:18:24 +01:00
|
|
|
target,
|
2008-05-21 23:37:44 +02:00
|
|
|
layout,
|
|
|
|
mapfile),
|
2007-11-22 01:05:51 +01:00
|
|
|
blocker,
|
|
|
|
"Task_function Layout_task_runner"));
|
2006-10-20 22:40:49 +02:00
|
|
|
}
|
2006-09-29 21:58:17 +02:00
|
|
|
|
|
|
|
// Queue up the final set of tasks. This is called at the end of
|
|
|
|
// Layout_task.
|
|
|
|
|
|
|
|
void
|
|
|
|
queue_final_tasks(const General_options& options,
|
|
|
|
const Input_objects* input_objects,
|
|
|
|
const Symbol_table* symtab,
|
2007-11-29 21:10:17 +01:00
|
|
|
Layout* layout,
|
2006-09-29 21:58:17 +02:00
|
|
|
Workqueue* workqueue,
|
|
|
|
Output_file* of)
|
|
|
|
{
|
2007-10-17 08:24:50 +02:00
|
|
|
int thread_count = options.thread_count_final();
|
|
|
|
if (thread_count == 0)
|
2008-02-06 21:32:10 +01:00
|
|
|
thread_count = std::max(2, input_objects->number_of_input_objects());
|
2007-10-17 08:24:50 +02:00
|
|
|
workqueue->set_thread_count(thread_count);
|
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
bool any_postprocessing_sections = layout->any_postprocessing_sections();
|
|
|
|
|
2007-11-09 08:00:15 +01:00
|
|
|
// Use a blocker to wait until all the input sections have been
|
|
|
|
// written out.
|
2007-12-14 20:00:21 +01:00
|
|
|
Task_token* input_sections_blocker = NULL;
|
|
|
|
if (!any_postprocessing_sections)
|
|
|
|
input_sections_blocker = new Task_token(true);
|
2007-11-09 08:00:15 +01:00
|
|
|
|
|
|
|
// Use a blocker to block any objects which have to wait for the
|
|
|
|
// output sections to complete before they can apply relocations.
|
2007-12-14 20:00:21 +01:00
|
|
|
Task_token* output_sections_blocker = new Task_token(true);
|
2007-11-09 08:00:15 +01:00
|
|
|
|
2006-09-29 21:58:17 +02:00
|
|
|
// Use a blocker to block the final cleanup task.
|
2007-12-14 20:00:21 +01:00
|
|
|
Task_token* final_blocker = new Task_token(true);
|
2006-09-29 21:58:17 +02:00
|
|
|
|
|
|
|
// Queue a task to write out the symbol table.
|
2008-02-07 05:35:41 +01:00
|
|
|
final_blocker->add_blocker();
|
2008-04-19 20:30:58 +02:00
|
|
|
workqueue->queue(new Write_symbols_task(layout,
|
|
|
|
symtab,
|
2008-02-07 05:35:41 +01:00
|
|
|
input_objects,
|
|
|
|
layout->sympool(),
|
|
|
|
layout->dynpool(),
|
|
|
|
of,
|
|
|
|
final_blocker));
|
2006-09-29 21:58:17 +02:00
|
|
|
|
2007-11-09 08:00:15 +01:00
|
|
|
// Queue a task to write out the output sections.
|
|
|
|
output_sections_blocker->add_blocker();
|
|
|
|
final_blocker->add_blocker();
|
|
|
|
workqueue->queue(new Write_sections_task(layout, of, output_sections_blocker,
|
|
|
|
final_blocker));
|
|
|
|
|
2006-09-29 21:58:17 +02:00
|
|
|
// Queue a task to write out everything else.
|
|
|
|
final_blocker->add_blocker();
|
2007-09-26 09:01:35 +02:00
|
|
|
workqueue->queue(new Write_data_task(layout, symtab, of, final_blocker));
|
2006-09-29 21:58:17 +02:00
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
// Queue a task for each input object to relocate the sections and
|
|
|
|
// write out the local symbols.
|
|
|
|
for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
|
|
|
|
p != input_objects->relobj_end();
|
|
|
|
++p)
|
|
|
|
{
|
|
|
|
if (input_sections_blocker != NULL)
|
|
|
|
input_sections_blocker->add_blocker();
|
|
|
|
final_blocker->add_blocker();
|
|
|
|
workqueue->queue(new Relocate_task(options, symtab, layout, *p, of,
|
|
|
|
input_sections_blocker,
|
|
|
|
output_sections_blocker,
|
|
|
|
final_blocker));
|
|
|
|
}
|
|
|
|
|
2007-11-09 08:00:15 +01:00
|
|
|
// Queue a task to write out the output sections which depend on
|
2007-12-14 20:00:21 +01:00
|
|
|
// input sections. If there are any sections which require
|
|
|
|
// postprocessing, then we need to do this last, since it may resize
|
|
|
|
// the output file.
|
|
|
|
if (!any_postprocessing_sections)
|
|
|
|
{
|
|
|
|
final_blocker->add_blocker();
|
|
|
|
Task* t = new Write_after_input_sections_task(layout, of,
|
|
|
|
input_sections_blocker,
|
|
|
|
final_blocker);
|
|
|
|
workqueue->queue(t);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
Task_token *new_final_blocker = new Task_token(true);
|
|
|
|
new_final_blocker->add_blocker();
|
|
|
|
Task* t = new Write_after_input_sections_task(layout, of,
|
|
|
|
final_blocker,
|
|
|
|
new_final_blocker);
|
|
|
|
workqueue->queue(t);
|
|
|
|
final_blocker = new_final_blocker;
|
|
|
|
}
|
2007-11-09 08:00:15 +01:00
|
|
|
|
2006-09-29 21:58:17 +02:00
|
|
|
// Queue a task to close the output file. This will be blocked by
|
|
|
|
// FINAL_BLOCKER.
|
2008-02-07 08:33:46 +01:00
|
|
|
workqueue->queue(new Task_function(new Close_task_runner(&options, layout,
|
|
|
|
of),
|
2007-11-22 01:05:51 +01:00
|
|
|
final_blocker,
|
|
|
|
"Task_function Close_task_runner"));
|
2006-09-29 21:58:17 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
} // End namespace gold.
|