2006-08-05 01:10:59 +02:00
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// readsyms.cc -- read input file symbols for gold
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2007-09-22 23:02:10 +02:00
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// Copyright 2006, 2007 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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2006-08-05 01:10:59 +02:00
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#include "gold.h"
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#include <cstring>
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#include "elfcpp.h"
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#include "options.h"
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#include "dirsearch.h"
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2006-11-06 23:46:08 +01:00
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#include "symtab.h"
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2006-09-22 00:13:18 +02:00
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#include "object.h"
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2006-09-29 21:58:17 +02:00
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#include "archive.h"
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2006-11-14 20:21:05 +01:00
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#include "script.h"
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2006-09-29 21:58:17 +02:00
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#include "readsyms.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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2007-10-22 20:02:36 +02:00
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// If we fail to open the object, then we won't create an Add_symbols
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// task. However, we still need to unblock the token, or else the
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// link won't proceed to generate more error messages. We can only
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2007-12-14 20:00:21 +01:00
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// unblock tokens when the workqueue lock is held, so we need a dummy
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// task to do that. The dummy task has to maintain the right sequence
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// of blocks, so we need both this_blocker and next_blocker.
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2007-10-22 20:02:36 +02:00
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class Unblock_token : public Task
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{
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public:
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Unblock_token(Task_token* this_blocker, Task_token* next_blocker)
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: this_blocker_(this_blocker), next_blocker_(next_blocker)
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{ }
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~Unblock_token()
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{
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if (this->this_blocker_ != NULL)
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delete this->this_blocker_;
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}
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2007-12-14 20:00:21 +01:00
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Task_token*
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is_runnable()
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2007-10-22 20:02:36 +02:00
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{
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if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
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2007-12-14 20:00:21 +01:00
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return this->this_blocker_;
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return NULL;
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2007-10-22 20:02:36 +02:00
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}
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2007-12-14 20:00:21 +01:00
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void
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locks(Task_locker* tl)
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{ tl->add(this, this->next_blocker_); }
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2007-10-22 20:02:36 +02:00
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void
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run(Workqueue*)
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{ }
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2007-11-22 01:05:51 +01:00
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std::string
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get_name() const
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{ return "Unblock_token"; }
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2007-10-22 20:02:36 +02:00
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private:
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Task_token* this_blocker_;
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Task_token* next_blocker_;
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};
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2006-08-05 01:10:59 +02:00
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// Class read_symbols.
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Read_symbols::~Read_symbols()
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{
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// The this_blocker_ and next_blocker_ pointers are passed on to the
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// Add_symbols task.
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}
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2006-11-03 19:26:11 +01:00
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// Return whether a Read_symbols task is runnable. We can read an
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// ordinary input file immediately. For an archive specified using
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// -l, we have to wait until the search path is complete.
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2006-08-05 01:10:59 +02:00
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2007-12-14 20:00:21 +01:00
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Task_token*
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Read_symbols::is_runnable()
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2006-08-05 01:10:59 +02:00
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{
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2006-11-14 20:21:05 +01:00
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if (this->input_argument_->is_file()
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2007-10-02 23:24:41 +02:00
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&& this->input_argument_->file().may_need_search()
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2007-12-14 20:00:21 +01:00
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&& this->dirpath_->token()->is_blocked())
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return this->dirpath_->token();
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2006-08-05 01:10:59 +02:00
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2007-12-14 20:00:21 +01:00
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return NULL;
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2006-08-05 01:10:59 +02:00
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}
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// Return a Task_locker for a Read_symbols task. We don't need any
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// locks here.
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2007-12-14 20:00:21 +01:00
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void
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Read_symbols::locks(Task_locker*)
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2006-08-05 01:10:59 +02:00
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{
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}
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2007-10-22 20:02:36 +02:00
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// Run a Read_symbols task.
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2006-08-05 01:10:59 +02:00
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void
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Read_symbols::run(Workqueue* workqueue)
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2007-10-22 20:02:36 +02:00
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{
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// If we didn't queue a new task, then we need to explicitly unblock
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// the token.
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if (!this->do_read_symbols(workqueue))
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2008-02-28 20:46:06 +01:00
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workqueue->queue_soon(new Unblock_token(this->this_blocker_,
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this->next_blocker_));
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2007-10-22 20:02:36 +02:00
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}
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// Open the file and read the symbols. Return true if a new task was
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// queued, false if that could not happen due to some error.
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bool
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Read_symbols::do_read_symbols(Workqueue* workqueue)
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2006-08-05 01:10:59 +02:00
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{
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2006-11-14 20:21:05 +01:00
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if (this->input_argument_->is_group())
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2006-11-03 19:26:11 +01:00
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{
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2006-11-29 18:56:40 +01:00
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gold_assert(this->input_group_ == NULL);
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2006-11-03 19:26:11 +01:00
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this->do_group(workqueue);
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2007-10-22 20:02:36 +02:00
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return true;
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2006-11-03 19:26:11 +01:00
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}
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2006-12-01 00:52:50 +01:00
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Input_file* input_file = new Input_file(&this->input_argument_->file());
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2007-12-14 20:00:21 +01:00
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if (!input_file->open(this->options_, *this->dirpath_, this))
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2007-10-22 20:02:36 +02:00
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return false;
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2006-08-05 01:10:59 +02:00
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// Read enough of the file to pick up the entire ELF header.
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2007-09-25 08:43:17 +02:00
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off_t filesize = input_file->file().filesize();
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2007-09-25 07:16:35 +02:00
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2007-09-25 08:43:17 +02:00
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if (filesize == 0)
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{
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2007-10-14 08:49:14 +02:00
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gold_error(_("%s: file is empty"),
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input_file->file().filename().c_str());
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2007-10-22 20:02:36 +02:00
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return false;
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2007-09-25 08:43:17 +02:00
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}
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unsigned char ehdr_buf[elfcpp::Elf_sizes<64>::ehdr_size];
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int read_size = elfcpp::Elf_sizes<64>::ehdr_size;
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if (filesize < read_size)
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read_size = filesize;
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input_file->file().read(0, read_size, ehdr_buf);
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if (read_size >= 4)
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2006-08-05 01:10:59 +02:00
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{
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static unsigned char elfmagic[4] =
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{
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elfcpp::ELFMAG0, elfcpp::ELFMAG1,
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elfcpp::ELFMAG2, elfcpp::ELFMAG3
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};
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2007-09-25 07:16:35 +02:00
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if (memcmp(ehdr_buf, elfmagic, 4) == 0)
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2006-08-05 01:10:59 +02:00
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{
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// This is an ELF object.
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2006-09-22 00:13:18 +02:00
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2006-11-14 20:21:05 +01:00
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Object* obj = make_elf_object(input_file->filename(),
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2007-09-25 08:43:17 +02:00
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input_file, 0, ehdr_buf, read_size);
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2007-10-14 08:49:14 +02:00
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if (obj == NULL)
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2007-10-22 20:02:36 +02:00
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return false;
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2006-11-14 20:21:05 +01:00
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2006-10-06 22:40:16 +02:00
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Read_symbols_data* sd = new Read_symbols_data;
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obj->read_symbols(sd);
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2007-12-14 20:00:21 +01:00
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// Opening the file locked it, so now we need to unlock it.
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// We need to unlock it before queuing the Add_symbols task,
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// because the workqueue doesn't know about our lock on the
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// file. If we queue the Add_symbols task first, it will be
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// stuck on the end of the file lock, but since the
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// workqueue doesn't know about that lock, it will never
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// release the Add_symbols task.
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input_file->file().unlock(this);
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2008-02-28 20:46:06 +01:00
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// We use queue_next because everything is cached for this
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// task to run right away if possible.
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workqueue->queue_next(new Add_symbols(this->input_objects_,
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this->symtab_, this->layout_,
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obj, sd,
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this->this_blocker_,
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this->next_blocker_));
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2006-08-05 01:10:59 +02:00
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2007-10-22 20:02:36 +02:00
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return true;
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2006-08-05 01:10:59 +02:00
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}
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}
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2007-09-25 08:43:17 +02:00
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if (read_size >= Archive::sarmag)
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2006-09-29 21:58:17 +02:00
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{
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2007-09-25 07:16:35 +02:00
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if (memcmp(ehdr_buf, Archive::armag, Archive::sarmag) == 0)
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2006-09-29 21:58:17 +02:00
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{
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// This is an archive.
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2006-11-14 20:21:05 +01:00
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Archive* arch = new Archive(this->input_argument_->file().name(),
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input_file);
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2007-12-14 20:00:21 +01:00
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arch->setup(this);
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2008-02-28 20:46:06 +01:00
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workqueue->queue_next(new Add_archive_symbols(this->symtab_,
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this->layout_,
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this->input_objects_,
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arch,
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this->input_group_,
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this->this_blocker_,
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this->next_blocker_));
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2007-10-22 20:02:36 +02:00
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return true;
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2006-09-29 21:58:17 +02:00
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}
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}
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2008-02-28 20:46:06 +01:00
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// Queue up a task to try to parse this file as a script. We use a
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// separate task so that the script will be read in order with other
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// objects named on the command line. Also so that we don't try to
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// read multiple scripts simultaneously, which could lead to
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// unpredictable changes to the General_options structure.
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workqueue->queue_soon(new Read_script(this->options_,
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this->symtab_,
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this->layout_,
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this->dirpath_,
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this->input_objects_,
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this->input_group_,
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this->input_argument_,
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input_file,
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this->this_blocker_,
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this->next_blocker_));
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return true;
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2006-08-05 01:10:59 +02:00
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}
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2006-11-03 19:26:11 +01:00
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// Handle a group. We need to walk through the arguments over and
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// over until we don't see any new undefined symbols. We do this by
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// setting off Read_symbols Tasks as usual, but recording the archive
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// entries instead of deleting them. We also start a Finish_group
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// Task which runs after we've read all the symbols. In that task we
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// process the archives in a loop until we are done.
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void
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Read_symbols::do_group(Workqueue* workqueue)
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{
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Input_group* input_group = new Input_group();
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2006-11-14 20:21:05 +01:00
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const Input_file_group* group = this->input_argument_->group();
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2006-11-03 19:26:11 +01:00
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Task_token* this_blocker = this->this_blocker_;
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2007-12-14 20:00:21 +01:00
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2006-11-03 19:26:11 +01:00
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for (Input_file_group::const_iterator p = group->begin();
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p != group->end();
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++p)
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{
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2006-11-14 20:21:05 +01:00
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const Input_argument* arg = &*p;
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2006-11-29 18:56:40 +01:00
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gold_assert(arg->is_file());
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2006-11-03 19:26:11 +01:00
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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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2006-11-03 19:26:11 +01:00
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next_blocker->add_blocker();
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2008-02-28 20:46:06 +01:00
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workqueue->queue_soon(new Read_symbols(this->options_,
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this->input_objects_,
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this->symtab_, this->layout_,
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this->dirpath_, arg, input_group,
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this_blocker, next_blocker));
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2006-11-03 19:26:11 +01:00
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this_blocker = next_blocker;
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}
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const int saw_undefined = this->symtab_->saw_undefined();
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2008-02-28 20:46:06 +01:00
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workqueue->queue_soon(new Finish_group(this->input_objects_,
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this->symtab_,
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this->layout_,
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input_group,
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saw_undefined,
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this_blocker,
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this->next_blocker_));
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2006-11-03 19:26:11 +01:00
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}
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2007-11-22 01:05:51 +01:00
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// Return a debugging name for a Read_symbols task.
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std::string
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Read_symbols::get_name() const
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{
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if (!this->input_argument_->is_group())
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{
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std::string ret("Read_symbols ");
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if (this->input_argument_->file().is_lib())
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ret += "-l";
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ret += this->input_argument_->file().name();
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return ret;
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}
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std::string ret("Read_symbols group (");
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bool add_space = false;
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const Input_file_group* group = this->input_argument_->group();
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for (Input_file_group::const_iterator p = group->begin();
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p != group->end();
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++p)
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{
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if (add_space)
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ret += ' ';
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ret += p->file().name();
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add_space = true;
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}
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return ret + ')';
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}
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2006-08-05 01:10:59 +02:00
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// Class Add_symbols.
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Add_symbols::~Add_symbols()
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{
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if (this->this_blocker_ != NULL)
|
|
|
|
delete this->this_blocker_;
|
|
|
|
// next_blocker_ is deleted by the task associated with the next
|
|
|
|
// input file.
|
|
|
|
}
|
|
|
|
|
2006-09-22 00:13:18 +02:00
|
|
|
// We are blocked by this_blocker_. We block next_blocker_. We also
|
|
|
|
// lock the file.
|
2006-08-05 01:10:59 +02:00
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
Task_token*
|
|
|
|
Add_symbols::is_runnable()
|
2006-08-05 01:10:59 +02:00
|
|
|
{
|
|
|
|
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
|
2007-12-14 20:00:21 +01:00
|
|
|
return this->this_blocker_;
|
2006-09-22 00:13:18 +02:00
|
|
|
if (this->object_->is_locked())
|
2007-12-14 20:00:21 +01:00
|
|
|
return this->object_->token();
|
|
|
|
return NULL;
|
2006-08-05 01:10:59 +02:00
|
|
|
}
|
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
void
|
|
|
|
Add_symbols::locks(Task_locker* tl)
|
2006-08-05 01:10:59 +02:00
|
|
|
{
|
2007-12-14 20:00:21 +01:00
|
|
|
tl->add(this, this->next_blocker_);
|
|
|
|
tl->add(this, this->object_->token());
|
2006-08-05 01:10:59 +02:00
|
|
|
}
|
|
|
|
|
2006-11-03 19:26:11 +01:00
|
|
|
// Add the symbols in the object to the symbol table.
|
|
|
|
|
2006-08-05 01:10:59 +02:00
|
|
|
void
|
|
|
|
Add_symbols::run(Workqueue*)
|
|
|
|
{
|
2006-12-06 07:28:56 +01:00
|
|
|
if (!this->input_objects_->add_object(this->object_))
|
|
|
|
{
|
|
|
|
// FIXME: We need to close the descriptor here.
|
|
|
|
delete this->object_;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2007-09-21 09:20:01 +02:00
|
|
|
this->object_->layout(this->symtab_, this->layout_, this->sd_);
|
2006-12-06 07:28:56 +01:00
|
|
|
this->object_->add_symbols(this->symtab_, this->sd_);
|
2007-12-14 20:00:21 +01:00
|
|
|
this->object_->release();
|
2006-12-06 07:28:56 +01:00
|
|
|
}
|
2006-10-06 22:40:16 +02:00
|
|
|
delete this->sd_;
|
|
|
|
this->sd_ = NULL;
|
2006-08-05 01:10:59 +02:00
|
|
|
}
|
|
|
|
|
2006-11-03 19:26:11 +01:00
|
|
|
// Class Finish_group.
|
|
|
|
|
|
|
|
Finish_group::~Finish_group()
|
|
|
|
{
|
|
|
|
if (this->this_blocker_ != NULL)
|
|
|
|
delete this->this_blocker_;
|
|
|
|
// next_blocker_ is deleted by the task associated with the next
|
|
|
|
// input file following the group.
|
|
|
|
}
|
|
|
|
|
|
|
|
// We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
|
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
Task_token*
|
|
|
|
Finish_group::is_runnable()
|
2006-11-03 19:26:11 +01:00
|
|
|
{
|
|
|
|
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
|
2007-12-14 20:00:21 +01:00
|
|
|
return this->this_blocker_;
|
|
|
|
return NULL;
|
2006-11-03 19:26:11 +01:00
|
|
|
}
|
|
|
|
|
2007-12-14 20:00:21 +01:00
|
|
|
void
|
|
|
|
Finish_group::locks(Task_locker* tl)
|
2006-11-03 19:26:11 +01:00
|
|
|
{
|
2007-12-14 20:00:21 +01:00
|
|
|
tl->add(this, this->next_blocker_);
|
2006-11-03 19:26:11 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
// Loop over the archives until there are no new undefined symbols.
|
|
|
|
|
|
|
|
void
|
|
|
|
Finish_group::run(Workqueue*)
|
|
|
|
{
|
|
|
|
int saw_undefined = this->saw_undefined_;
|
|
|
|
while (saw_undefined != this->symtab_->saw_undefined())
|
|
|
|
{
|
|
|
|
saw_undefined = this->symtab_->saw_undefined();
|
|
|
|
|
|
|
|
for (Input_group::const_iterator p = this->input_group_->begin();
|
|
|
|
p != this->input_group_->end();
|
|
|
|
++p)
|
|
|
|
{
|
2007-12-14 20:00:21 +01:00
|
|
|
Task_lock_obj<Archive> tl(this, *p);
|
2006-11-03 19:26:11 +01:00
|
|
|
|
2007-09-21 09:20:01 +02:00
|
|
|
(*p)->add_symbols(this->symtab_, this->layout_,
|
2006-11-03 19:26:11 +01:00
|
|
|
this->input_objects_);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Delete all the archives now that we no longer need them.
|
|
|
|
for (Input_group::const_iterator p = this->input_group_->begin();
|
|
|
|
p != this->input_group_->end();
|
|
|
|
++p)
|
|
|
|
delete *p;
|
|
|
|
delete this->input_group_;
|
|
|
|
}
|
|
|
|
|
2008-02-28 20:46:06 +01:00
|
|
|
// Class Read_script
|
|
|
|
|
|
|
|
Read_script::~Read_script()
|
|
|
|
{
|
|
|
|
if (this->this_blocker_ != NULL)
|
|
|
|
delete this->this_blocker_;
|
|
|
|
// next_blocker_ is deleted by the task associated with the next
|
|
|
|
// input file.
|
|
|
|
}
|
|
|
|
|
|
|
|
// We are blocked by this_blocker_.
|
|
|
|
|
|
|
|
Task_token*
|
|
|
|
Read_script::is_runnable()
|
|
|
|
{
|
|
|
|
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
|
|
|
|
return this->this_blocker_;
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
// We don't unlock next_blocker_ here. If the script names any input
|
|
|
|
// files, then the last file will be responsible for unlocking it.
|
|
|
|
|
|
|
|
void
|
|
|
|
Read_script::locks(Task_locker*)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
// Read the script, if it is a script.
|
|
|
|
|
|
|
|
void
|
|
|
|
Read_script::run(Workqueue* workqueue)
|
|
|
|
{
|
|
|
|
bool used_next_blocker;
|
|
|
|
if (!read_input_script(workqueue, this->options_, this->symtab_,
|
|
|
|
this->layout_, this->dirpath_, this->input_objects_,
|
|
|
|
this->input_group_, this->input_argument_,
|
|
|
|
this->input_file_, this->next_blocker_,
|
|
|
|
&used_next_blocker))
|
|
|
|
{
|
|
|
|
// Here we have to handle any other input file types we need.
|
|
|
|
gold_error(_("%s: not an object or archive"),
|
|
|
|
this->input_file_->file().filename().c_str());
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!used_next_blocker)
|
|
|
|
{
|
|
|
|
// Queue up a task to unlock next_blocker. We can't just unlock
|
|
|
|
// it here, as we don't hold the workqueue lock.
|
|
|
|
workqueue->queue_soon(new Unblock_token(NULL, this->next_blocker_));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Return a debugging name for a Read_script task.
|
|
|
|
|
|
|
|
std::string
|
|
|
|
Read_script::get_name() const
|
|
|
|
{
|
|
|
|
std::string ret("Read_script ");
|
|
|
|
if (this->input_argument_->file().is_lib())
|
|
|
|
ret += "-l";
|
|
|
|
ret += this->input_argument_->file().name();
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2006-08-05 01:10:59 +02:00
|
|
|
} // End namespace gold.
|