338 lines
8.9 KiB
C++
338 lines
8.9 KiB
C++
// readsyms.cc -- read input file symbols for gold
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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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#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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namespace gold
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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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// 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::Is_runnable_type
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Read_symbols::is_runnable(Workqueue*)
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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 IS_BLOCKED;
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return IS_RUNNABLE;
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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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Task_locker*
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Read_symbols::locks(Workqueue*)
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{
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return NULL;
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}
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// Run a Read_symbols task. This is where we actually read the
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// symbols and relocations.
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void
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Read_symbols::run(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;
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}
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Input_file* input_file = new Input_file(&this->input_argument_->file());
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input_file->open(this->options_, this->dirpath_);
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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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fprintf(stderr, _("%s: %s: file is empty\n"),
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program_name, input_file->file().filename().c_str());
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gold_exit(false);
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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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{
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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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if (memcmp(ehdr_buf, elfmagic, 4) == 0)
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{
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// This is an ELF object.
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Object* obj = make_elf_object(input_file->filename(),
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input_file, 0, ehdr_buf, read_size);
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// We don't have a way to record a non-archive in an input
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// group. If this is an ordinary object file, we can't
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// include it more than once anyhow. If this is a dynamic
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// object, then including it a second time changes nothing.
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if (this->input_group_ != NULL && !obj->is_dynamic())
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{
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fprintf(stderr,
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_("%s: %s: ordinary object found in input group\n"),
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program_name, input_file->name());
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gold_exit(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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workqueue->queue_front(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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// Opening the file locked it, so now we need to unlock it.
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input_file->file().unlock();
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return;
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}
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}
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if (read_size >= Archive::sarmag)
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{
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if (memcmp(ehdr_buf, 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);
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arch->setup();
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workqueue->queue(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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return;
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}
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}
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// Try to parse this file as a script.
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if (read_input_script(workqueue, this->options_, this->symtab_,
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this->layout_, this->dirpath_, this->input_objects_,
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this->input_group_, this->input_argument_, input_file,
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ehdr_buf, read_size, this->this_blocker_,
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this->next_blocker_))
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return;
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// Here we have to handle any other input file types we need.
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fprintf(stderr, _("%s: %s: not an object or archive\n"),
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program_name, input_file->file().filename().c_str());
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gold_exit(false);
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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();
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next_blocker->add_blocker();
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workqueue->queue(new Read_symbols(this->options_, 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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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(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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}
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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::Is_runnable_type
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Add_symbols::is_runnable(Workqueue*)
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{
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if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
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return IS_BLOCKED;
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if (this->object_->is_locked())
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return IS_LOCKED;
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return IS_RUNNABLE;
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}
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class Add_symbols::Add_symbols_locker : public Task_locker
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{
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public:
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Add_symbols_locker(Task_token& token, Workqueue* workqueue,
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Object* object)
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: blocker_(token, workqueue), objlock_(*object)
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{ }
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private:
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Task_locker_block blocker_;
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Task_locker_obj<Object> objlock_;
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};
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Task_locker*
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Add_symbols::locks(Workqueue* workqueue)
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{
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return new Add_symbols_locker(*this->next_blocker_, workqueue,
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this->object_);
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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*)
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{
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if (!this->input_objects_->add_object(this->object_))
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{
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// FIXME: We need to close the descriptor here.
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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_);
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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::Is_runnable_type
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Finish_group::is_runnable(Workqueue*)
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{
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if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
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return IS_BLOCKED;
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return IS_RUNNABLE;
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}
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Task_locker*
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Finish_group::locks(Workqueue* workqueue)
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{
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return new Task_locker_block(*this->next_blocker_, workqueue);
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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(**p);
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(*p)->add_symbols(this->symtab_, this->layout_,
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this->input_objects_);
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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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} // End namespace gold.
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