f6060a4d43
* object.h (is_elf_object): Declare. * archive.cc (Archive::get_elf_object_for_member): Call is_elf_object. * readsymc.cc (Read_symbols::do_read_symbols): Likewise.
595 lines
16 KiB
C++
595 lines
16 KiB
C++
// readsyms.cc -- read input file symbols for gold
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// Copyright 2006, 2007, 2008, 2009 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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#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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#include "symtab.h"
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#include "object.h"
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#include "archive.h"
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#include "script.h"
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#include "readsyms.h"
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#include "plugin.h"
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namespace gold
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{
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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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// 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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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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Task_token*
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is_runnable()
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{
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if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
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return this->this_blocker_;
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return NULL;
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}
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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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void
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run(Workqueue*)
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{ }
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std::string
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get_name() const
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{ return "Unblock_token"; }
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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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// 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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// If appropriate, issue a warning about skipping an incompatible
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// file.
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void
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Read_symbols::incompatible_warning(const Input_argument* input_argument,
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const Input_file* input_file)
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{
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if (parameters->options().warn_search_mismatch())
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gold_warning("skipping incompatible %s while searching for %s",
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input_file->filename().c_str(),
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input_argument->file().name());
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}
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// Requeue a Read_symbols task to search for the next object with the
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// same name.
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void
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Read_symbols::requeue(Workqueue* workqueue, Input_objects* input_objects,
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Symbol_table* symtab, Layout* layout, Dirsearch* dirpath,
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int dirindex, Mapfile* mapfile,
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const Input_argument* input_argument,
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Input_group* input_group, Task_token* next_blocker)
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{
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// Bump the directory search index.
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++dirindex;
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// We don't need to worry about this_blocker, since we already
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// reached it. However, we are removing the blocker on next_blocker
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// because the calling task is completing. So we need to add a new
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// blocker. Since next_blocker may be shared by several tasks, we
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// need to increment the count with the workqueue lock held.
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workqueue->add_blocker(next_blocker);
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workqueue->queue(new Read_symbols(input_objects, symtab, layout, dirpath,
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dirindex, mapfile, input_argument,
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input_group, NULL, next_blocker));
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}
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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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Task_token*
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Read_symbols::is_runnable()
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{
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if (this->input_argument_->is_file()
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&& this->input_argument_->file().may_need_search()
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&& this->dirpath_->token()->is_blocked())
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return this->dirpath_->token();
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return NULL;
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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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void
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Read_symbols::locks(Task_locker*)
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{
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}
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// Run a Read_symbols task.
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void
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Read_symbols::run(Workqueue* workqueue)
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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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workqueue->queue_soon(new Unblock_token(this->this_blocker_,
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this->next_blocker_));
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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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{
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if (this->input_argument_->is_group())
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{
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gold_assert(this->input_group_ == NULL);
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this->do_group(workqueue);
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return true;
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}
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Input_file* input_file = new Input_file(&this->input_argument_->file());
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if (!input_file->open(*this->dirpath_, this, &this->dirindex_))
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return false;
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// Read enough of the file to pick up the entire ELF header.
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off_t filesize = input_file->file().filesize();
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if (filesize == 0)
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{
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gold_error(_("%s: file is empty"),
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input_file->file().filename().c_str());
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return false;
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}
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const unsigned char* ehdr;
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int read_size;
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bool is_elf = is_elf_object(input_file, 0, &ehdr, &read_size);
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if (read_size >= Archive::sarmag)
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{
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bool is_thin_archive
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= memcmp(ehdr, Archive::armagt, Archive::sarmag) == 0;
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if (is_thin_archive
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|| memcmp(ehdr, Archive::armag, Archive::sarmag) == 0)
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{
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// This is an archive.
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Archive* arch = new Archive(this->input_argument_->file().name(),
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input_file, is_thin_archive,
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this->dirpath_, this);
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arch->setup();
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// Unlock the archive so it can be used in the next task.
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arch->unlock(this);
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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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this->dirpath_,
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this->dirindex_,
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this->mapfile_,
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this->input_argument_,
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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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return true;
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}
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}
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if (parameters->options().has_plugins())
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{
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Pluginobj* obj = parameters->options().plugins()->claim_file(input_file,
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0, filesize);
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if (obj != NULL)
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{
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// The input file was claimed by a plugin, and its symbols
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// have been provided by the plugin.
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// We are done with the file at this point, so unlock it.
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obj->unlock(this);
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workqueue->queue_next(new Add_symbols(this->input_objects_,
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this->symtab_,
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this->layout_,
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this->dirpath_,
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this->dirindex_,
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this->mapfile_,
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this->input_argument_,
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this->input_group_,
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obj,
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NULL,
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this->this_blocker_,
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this->next_blocker_));
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return true;
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}
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}
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if (is_elf)
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{
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// This is an ELF object.
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bool unconfigured;
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Object* obj = make_elf_object(input_file->filename(),
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input_file, 0, ehdr, read_size,
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&unconfigured);
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if (obj == NULL)
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{
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if (unconfigured && input_file->will_search_for())
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{
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Read_symbols::incompatible_warning(this->input_argument_,
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input_file);
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input_file->file().release();
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input_file->file().unlock(this);
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delete input_file;
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++this->dirindex_;
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return this->do_read_symbols(workqueue);
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}
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return false;
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}
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Read_symbols_data* sd = new Read_symbols_data;
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obj->read_symbols(sd);
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// Opening the file locked it, so now we need to unlock it. We
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// 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 workqueue
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// doesn't know about that lock, it will never release the
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// Add_symbols task.
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input_file->file().unlock(this);
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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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this->dirpath_,
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this->dirindex_,
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this->mapfile_,
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this->input_argument_,
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this->input_group_,
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obj,
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sd,
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this->this_blocker_,
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this->next_blocker_));
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return true;
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}
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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->symtab_,
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this->layout_,
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this->dirpath_,
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this->dirindex_,
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this->input_objects_,
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this->mapfile_,
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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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}
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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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const Input_file_group* group = this->input_argument_->group();
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Task_token* this_blocker = this->this_blocker_;
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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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const Input_argument* arg = &*p;
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gold_assert(arg->is_file());
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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_soon(new Read_symbols(this->input_objects_,
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this->symtab_, this->layout_,
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this->dirpath_, this->dirindex_,
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this->mapfile_, arg, input_group,
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this_blocker, next_blocker));
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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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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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this->mapfile_,
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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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}
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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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// Class Add_symbols.
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Add_symbols::~Add_symbols()
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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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// next_blocker_ is deleted by the task associated with the next
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// input file.
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}
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// We are blocked by this_blocker_. We block next_blocker_. We also
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// lock the file.
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Task_token*
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Add_symbols::is_runnable()
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{
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if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
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return this->this_blocker_;
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if (this->object_->is_locked())
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return this->object_->token();
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return NULL;
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}
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void
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Add_symbols::locks(Task_locker* tl)
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{
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tl->add(this, this->next_blocker_);
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tl->add(this, this->object_->token());
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}
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// Add the symbols in the object to the symbol table.
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void
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Add_symbols::run(Workqueue* workqueue)
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{
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Pluginobj* pluginobj = this->object_->pluginobj();
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if (pluginobj != NULL)
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{
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this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
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return;
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}
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// If this file has an incompatible format, try for another file
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// with the same name.
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if (this->object_->searched_for()
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&& !parameters->is_compatible_target(this->object_->target()))
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{
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Read_symbols::incompatible_warning(this->input_argument_,
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this->object_->input_file());
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Read_symbols::requeue(workqueue, this->input_objects_, this->symtab_,
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this->layout_, this->dirpath_, this->dirindex_,
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this->mapfile_, this->input_argument_,
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this->input_group_, this->next_blocker_);
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this->object_->release();
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delete this->object_;
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}
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else if (!this->input_objects_->add_object(this->object_))
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{
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this->object_->release();
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delete this->object_;
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}
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else
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{
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this->object_->layout(this->symtab_, this->layout_, this->sd_);
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this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
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this->object_->release();
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}
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delete this->sd_;
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this->sd_ = NULL;
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}
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// Class Finish_group.
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Finish_group::~Finish_group()
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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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// next_blocker_ is deleted by the task associated with the next
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// input file following the group.
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}
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// We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
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Task_token*
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Finish_group::is_runnable()
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{
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if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
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return this->this_blocker_;
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return NULL;
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}
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void
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Finish_group::locks(Task_locker* tl)
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{
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tl->add(this, this->next_blocker_);
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}
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// Loop over the archives until there are no new undefined symbols.
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void
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Finish_group::run(Workqueue*)
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{
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int saw_undefined = this->saw_undefined_;
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while (saw_undefined != this->symtab_->saw_undefined())
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{
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saw_undefined = this->symtab_->saw_undefined();
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for (Input_group::const_iterator p = this->input_group_->begin();
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p != this->input_group_->end();
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++p)
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{
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Task_lock_obj<Archive> tl(this, *p);
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(*p)->add_symbols(this->symtab_, this->layout_,
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this->input_objects_, this->mapfile_);
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}
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}
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// Delete all the archives now that we no longer need them.
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for (Input_group::const_iterator p = this->input_group_->begin();
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p != this->input_group_->end();
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++p)
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delete *p;
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delete this->input_group_;
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}
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// Class Read_script
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Read_script::~Read_script()
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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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// next_blocker_ is deleted by the task associated with the next
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// input file.
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}
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// We are blocked by this_blocker_.
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Task_token*
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Read_script::is_runnable()
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{
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if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
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return this->this_blocker_;
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return NULL;
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}
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// 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->symtab_, this->layout_,
|
|
this->dirpath_, this->dirindex_, this->input_objects_,
|
|
this->mapfile_, 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;
|
|
}
|
|
|
|
} // End namespace gold.
|