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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.20.1/] [gold/] [readsyms.cc] - Rev 419
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// readsyms.cc -- read input file symbols for gold // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc. // Written by Ian Lance Taylor <iant@google.com>. // This file is part of gold. // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, // MA 02110-1301, USA. #include "gold.h" #include <cstring> #include "elfcpp.h" #include "options.h" #include "dirsearch.h" #include "symtab.h" #include "object.h" #include "archive.h" #include "script.h" #include "readsyms.h" #include "plugin.h" #include "layout.h" #include "incremental.h" namespace gold { // If we fail to open the object, then we won't create an Add_symbols // task. However, we still need to unblock the token, or else the // link won't proceed to generate more error messages. We can only // unblock tokens when the workqueue lock is held, so we need a dummy // task to do that. The dummy task has to maintain the right sequence // of blocks, so we need both this_blocker and next_blocker. class Unblock_token : public Task { public: Unblock_token(Task_token* this_blocker, Task_token* next_blocker) : this_blocker_(this_blocker), next_blocker_(next_blocker) { } ~Unblock_token() { if (this->this_blocker_ != NULL) delete this->this_blocker_; } Task_token* is_runnable() { if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) return this->this_blocker_; return NULL; } void locks(Task_locker* tl) { tl->add(this, this->next_blocker_); } void run(Workqueue*) { } std::string get_name() const { return "Unblock_token"; } private: Task_token* this_blocker_; Task_token* next_blocker_; }; // Class read_symbols. Read_symbols::~Read_symbols() { // The this_blocker_ and next_blocker_ pointers are passed on to the // Add_symbols task. } // If appropriate, issue a warning about skipping an incompatible // file. void Read_symbols::incompatible_warning(const Input_argument* input_argument, const Input_file* input_file) { if (parameters->options().warn_search_mismatch()) gold_warning("skipping incompatible %s while searching for %s", input_file->filename().c_str(), input_argument->file().name()); } // Requeue a Read_symbols task to search for the next object with the // same name. void Read_symbols::requeue(Workqueue* workqueue, Input_objects* input_objects, Symbol_table* symtab, Layout* layout, Dirsearch* dirpath, int dirindex, Mapfile* mapfile, const Input_argument* input_argument, Input_group* input_group, Task_token* next_blocker) { // Bump the directory search index. ++dirindex; // We don't need to worry about this_blocker, since we already // reached it. However, we are removing the blocker on next_blocker // because the calling task is completing. So we need to add a new // blocker. Since next_blocker may be shared by several tasks, we // need to increment the count with the workqueue lock held. workqueue->add_blocker(next_blocker); workqueue->queue(new Read_symbols(input_objects, symtab, layout, dirpath, dirindex, mapfile, input_argument, input_group, NULL, next_blocker)); } // Return whether a Read_symbols task is runnable. We can read an // ordinary input file immediately. For an archive specified using // -l, we have to wait until the search path is complete. Task_token* Read_symbols::is_runnable() { if (this->input_argument_->is_file() && this->input_argument_->file().may_need_search() && this->dirpath_->token()->is_blocked()) return this->dirpath_->token(); return NULL; } // Return a Task_locker for a Read_symbols task. We don't need any // locks here. void Read_symbols::locks(Task_locker*) { } // Run a Read_symbols task. void Read_symbols::run(Workqueue* workqueue) { // If we didn't queue a new task, then we need to explicitly unblock // the token. if (!this->do_read_symbols(workqueue)) workqueue->queue_soon(new Unblock_token(this->this_blocker_, this->next_blocker_)); } // Open the file and read the symbols. Return true if a new task was // queued, false if that could not happen due to some error. bool Read_symbols::do_read_symbols(Workqueue* workqueue) { if (this->input_argument_->is_group()) { gold_assert(this->input_group_ == NULL); this->do_group(workqueue); return true; } Input_file* input_file = new Input_file(&this->input_argument_->file()); if (!input_file->open(*this->dirpath_, this, &this->dirindex_)) return false; // Read enough of the file to pick up the entire ELF header. off_t filesize = input_file->file().filesize(); if (filesize == 0) { gold_error(_("%s: file is empty"), input_file->file().filename().c_str()); return false; } const unsigned char* ehdr; int read_size; bool is_elf = is_elf_object(input_file, 0, &ehdr, &read_size); if (read_size >= Archive::sarmag) { bool is_thin_archive = memcmp(ehdr, Archive::armagt, Archive::sarmag) == 0; if (is_thin_archive || memcmp(ehdr, Archive::armag, Archive::sarmag) == 0) { // This is an archive. Archive* arch = new Archive(this->input_argument_->file().name(), input_file, is_thin_archive, this->dirpath_, this); arch->setup(); if (this->layout_->incremental_inputs()) { const Input_argument* ia = this->input_argument_; this->layout_->incremental_inputs()->report_archive(ia, arch); } // Unlock the archive so it can be used in the next task. arch->unlock(this); workqueue->queue_next(new Add_archive_symbols(this->symtab_, this->layout_, this->input_objects_, this->dirpath_, this->dirindex_, this->mapfile_, this->input_argument_, arch, this->input_group_, this->this_blocker_, this->next_blocker_)); return true; } } if (parameters->options().has_plugins()) { Pluginobj* obj = parameters->options().plugins()->claim_file(input_file, 0, filesize); if (obj != NULL) { // The input file was claimed by a plugin, and its symbols // have been provided by the plugin. // We are done with the file at this point, so unlock it. obj->unlock(this); workqueue->queue_next(new Add_symbols(this->input_objects_, this->symtab_, this->layout_, this->dirpath_, this->dirindex_, this->mapfile_, this->input_argument_, this->input_group_, obj, NULL, this->this_blocker_, this->next_blocker_)); return true; } } if (is_elf) { // This is an ELF object. bool unconfigured = false; bool* punconfigured = (input_file->will_search_for() ? &unconfigured : NULL); Object* obj = make_elf_object(input_file->filename(), input_file, 0, ehdr, read_size, punconfigured); if (obj == NULL) { if (unconfigured) { Read_symbols::incompatible_warning(this->input_argument_, input_file); input_file->file().release(); input_file->file().unlock(this); delete input_file; ++this->dirindex_; return this->do_read_symbols(workqueue); } return false; } Read_symbols_data* sd = new Read_symbols_data; obj->read_symbols(sd); if (this->layout_->incremental_inputs()) { const Input_argument* ia = this->input_argument_; this->layout_->incremental_inputs()->report_object(ia, obj); } // Opening the file locked it, so now we need to unlock it. We // need to unlock it before queuing the Add_symbols task, // because the workqueue doesn't know about our lock on the // file. If we queue the Add_symbols task first, it will be // stuck on the end of the file lock, but since the workqueue // doesn't know about that lock, it will never release the // Add_symbols task. input_file->file().unlock(this); // We use queue_next because everything is cached for this // task to run right away if possible. workqueue->queue_next(new Add_symbols(this->input_objects_, this->symtab_, this->layout_, this->dirpath_, this->dirindex_, this->mapfile_, this->input_argument_, this->input_group_, obj, sd, this->this_blocker_, this->next_blocker_)); return true; } // Queue up a task to try to parse this file as a script. We use a // separate task so that the script will be read in order with other // objects named on the command line. Also so that we don't try to // read multiple scripts simultaneously, which could lead to // unpredictable changes to the General_options structure. workqueue->queue_soon(new Read_script(this->symtab_, this->layout_, this->dirpath_, this->dirindex_, this->input_objects_, this->mapfile_, this->input_group_, this->input_argument_, input_file, this->this_blocker_, this->next_blocker_)); return true; } // Handle a group. We need to walk through the arguments over and // over until we don't see any new undefined symbols. We do this by // setting off Read_symbols Tasks as usual, but recording the archive // entries instead of deleting them. We also start a Finish_group // Task which runs after we've read all the symbols. In that task we // process the archives in a loop until we are done. void Read_symbols::do_group(Workqueue* workqueue) { Input_group* input_group = new Input_group(); const Input_file_group* group = this->input_argument_->group(); Task_token* this_blocker = this->this_blocker_; for (Input_file_group::const_iterator p = group->begin(); p != group->end(); ++p) { const Input_argument* arg = &*p; gold_assert(arg->is_file()); Task_token* next_blocker = new Task_token(true); next_blocker->add_blocker(); workqueue->queue_soon(new Read_symbols(this->input_objects_, this->symtab_, this->layout_, this->dirpath_, this->dirindex_, this->mapfile_, arg, input_group, this_blocker, next_blocker)); this_blocker = next_blocker; } const int saw_undefined = this->symtab_->saw_undefined(); workqueue->queue_soon(new Finish_group(this->input_objects_, this->symtab_, this->layout_, this->mapfile_, input_group, saw_undefined, this_blocker, this->next_blocker_)); } // Return a debugging name for a Read_symbols task. std::string Read_symbols::get_name() const { if (!this->input_argument_->is_group()) { std::string ret("Read_symbols "); if (this->input_argument_->file().is_lib()) ret += "-l"; else if (this->input_argument_->file().is_searched_file()) ret += "-l:"; ret += this->input_argument_->file().name(); return ret; } std::string ret("Read_symbols group ("); bool add_space = false; const Input_file_group* group = this->input_argument_->group(); for (Input_file_group::const_iterator p = group->begin(); p != group->end(); ++p) { if (add_space) ret += ' '; ret += p->file().name(); add_space = true; } return ret + ')'; } // Class Add_symbols. Add_symbols::~Add_symbols() { 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_. We block next_blocker_. We also // lock the file. Task_token* Add_symbols::is_runnable() { if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) return this->this_blocker_; if (this->object_->is_locked()) return this->object_->token(); return NULL; } void Add_symbols::locks(Task_locker* tl) { tl->add(this, this->next_blocker_); tl->add(this, this->object_->token()); } // Add the symbols in the object to the symbol table. void Add_symbols::run(Workqueue*) { Pluginobj* pluginobj = this->object_->pluginobj(); if (pluginobj != NULL) { this->object_->add_symbols(this->symtab_, this->sd_, this->layout_); return; } if (!this->input_objects_->add_object(this->object_)) { this->object_->release(); delete this->object_; } else { this->object_->layout(this->symtab_, this->layout_, this->sd_); this->object_->add_symbols(this->symtab_, this->sd_, this->layout_); this->object_->release(); } delete this->sd_; this->sd_ = NULL; } // 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_. Task_token* Finish_group::is_runnable() { if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) return this->this_blocker_; return NULL; } void Finish_group::locks(Task_locker* tl) { tl->add(this, this->next_blocker_); } // 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) { Task_lock_obj<Archive> tl(this, *p); (*p)->add_symbols(this->symtab_, this->layout_, this->input_objects_, this->mapfile_); } } // 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_; } // 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->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"; else if (this->input_argument_->file().is_searched_file()) ret += "-l:"; ret += this->input_argument_->file().name(); return ret; } } // End namespace gold.
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