// 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 "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()
// 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::Is_runnable_type
-Read_symbols::is_runnable(Workqueue*)
+Task_token*
+Read_symbols::is_runnable()
{
if (this->input_argument_->is_file()
- && this->input_argument_->file().is_lib()
- && this->dirpath_.token().is_blocked())
- return IS_BLOCKED;
+ && this->input_argument_->file().may_need_search()
+ && this->dirpath_->token()->is_blocked())
+ return this->dirpath_->token();
- return IS_RUNNABLE;
+ return NULL;
}
// Return a Task_locker for a Read_symbols task. We don't need any
// locks here.
-Task_locker*
-Read_symbols::locks(Workqueue*)
+void
+Read_symbols::locks(Task_locker*)
{
- return NULL;
}
-// Run a Read_symbols task. This is where we actually read the
-// symbols and relocations.
+// 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;
+ return true;
}
Input_file* input_file = new Input_file(&this->input_argument_->file());
- input_file->open(this->options_, this->dirpath_);
+ if (!input_file->open(*this->dirpath_, this, &this->dirindex_))
+ return false;
// Read enough of the file to pick up the entire ELF header.
- int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
- off_t bytes;
- const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes);
- if (bytes >= 4)
+ off_t filesize = input_file->file().filesize();
+
+ if (filesize == 0)
{
- static unsigned char elfmagic[4] =
- {
- elfcpp::ELFMAG0, elfcpp::ELFMAG1,
- elfcpp::ELFMAG2, elfcpp::ELFMAG3
- };
- if (memcmp(p, elfmagic, 4) == 0)
- {
- // This is an ELF object.
+ gold_error(_("%s: file is empty"),
+ input_file->file().filename().c_str());
+ return false;
+ }
- Object* obj = make_elf_object(input_file->filename(),
- input_file, 0, p, bytes);
+ 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();
- // We don't have a way to record a non-archive in an input
- // group. If this is an ordinary object file, we can't
- // include it more than once anyhow. If this is a dynamic
- // object, then including it a second time changes nothing.
- if (this->input_group_ != NULL && !obj->is_dynamic())
+ if (this->layout_->incremental_inputs())
{
- fprintf(stderr,
- _("%s: %s: ordinary object found in input group\n"),
- program_name, input_file->name());
- gold_exit(false);
+ const Input_argument* ia = this->input_argument_;
+ this->layout_->incremental_inputs()->report_archive(ia, arch);
}
- Read_symbols_data* sd = new Read_symbols_data;
- obj->read_symbols(sd);
- workqueue->queue_front(new Add_symbols(this->options_,
- this->input_objects_,
- this->symtab_, this->layout_,
- obj, sd,
- this->this_blocker_,
- this->next_blocker_));
-
- // Opening the file locked it, so now we need to unlock it.
- input_file->file().unlock();
-
- return;
+ // 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 (bytes >= Archive::sarmag)
+ if (parameters->options().has_plugins())
{
- if (memcmp(p, Archive::armag, Archive::sarmag) == 0)
- {
- // This is an archive.
- Archive* arch = new Archive(this->input_argument_->file().name(),
- input_file);
- arch->setup();
- workqueue->queue(new Add_archive_symbols(this->options_,
- this->symtab_,
- this->layout_,
- this->input_objects_,
- arch,
- this->input_group_,
- this->this_blocker_,
- this->next_blocker_));
- return;
- }
+ 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 (bytes == 0)
+ if (is_elf)
{
- fprintf(stderr, _("%s: %s: file is empty\n"),
- program_name, input_file->file().filename().c_str());
- gold_exit(false);
+ // This is an ELF object.
+
+ bool unconfigured;
+ Object* obj = make_elf_object(input_file->filename(),
+ input_file, 0, ehdr, read_size,
+ &unconfigured);
+ if (obj == NULL)
+ {
+ if (unconfigured && input_file->will_search_for())
+ {
+ 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;
}
- // Try to parse this file as a script.
- if (read_input_script(workqueue, this->options_, this->symtab_,
- this->layout_, this->dirpath_, this->input_objects_,
- this->input_group_, this->input_argument_, input_file,
- p, bytes, this->this_blocker_, this->next_blocker_))
- return;
-
- // Here we have to handle any other input file types we need.
- fprintf(stderr, _("%s: %s: not an object or archive\n"),
- program_name, input_file->file().filename().c_str());
- gold_exit(false);
+ // 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
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();
+ Task_token* next_blocker = new Task_token(true);
next_blocker->add_blocker();
- workqueue->queue(new Read_symbols(this->options_, this->input_objects_,
- this->symtab_, this->layout_,
- this->dirpath_, arg, input_group,
- this_blocker, next_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(new Finish_group(this->options_,
- this->input_objects_,
- this->symtab_,
- this->layout_,
- input_group,
- saw_undefined,
- this_blocker,
- this->next_blocker_));
+ 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";
+ 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.
// We are blocked by this_blocker_. We block next_blocker_. We also
// lock the file.
-Task::Is_runnable_type
-Add_symbols::is_runnable(Workqueue*)
+Task_token*
+Add_symbols::is_runnable()
{
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
- return IS_BLOCKED;
+ return this->this_blocker_;
if (this->object_->is_locked())
- return IS_LOCKED;
- return IS_RUNNABLE;
+ return this->object_->token();
+ return NULL;
}
-class Add_symbols::Add_symbols_locker : public Task_locker
-{
- public:
- Add_symbols_locker(Task_token& token, Workqueue* workqueue,
- Object* object)
- : blocker_(token, workqueue), objlock_(*object)
- { }
-
- private:
- Task_locker_block blocker_;
- Task_locker_obj<Object> objlock_;
-};
-
-Task_locker*
-Add_symbols::locks(Workqueue* workqueue)
+void
+Add_symbols::locks(Task_locker* tl)
{
- return new Add_symbols_locker(*this->next_blocker_, workqueue,
- this->object_);
+ 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*)
+Add_symbols::run(Workqueue* workqueue)
{
- if (!this->input_objects_->add_object(this->object_))
+ Pluginobj* pluginobj = this->object_->pluginobj();
+ if (pluginobj != NULL)
+ {
+ this->object_->add_symbols(this->symtab_, this->sd_, this->layout_);
+ return;
+ }
+
+ // If this file has an incompatible format, try for another file
+ // with the same name.
+ if (this->object_->searched_for()
+ && !parameters->is_compatible_target(this->object_->target()))
+ {
+ Read_symbols::incompatible_warning(this->input_argument_,
+ this->object_->input_file());
+ Read_symbols::requeue(workqueue, this->input_objects_, this->symtab_,
+ this->layout_, this->dirpath_, this->dirindex_,
+ this->mapfile_, this->input_argument_,
+ this->input_group_, this->next_blocker_);
+ this->object_->release();
+ delete this->object_;
+ }
+ else if (!this->input_objects_->add_object(this->object_))
{
- // FIXME: We need to close the descriptor here.
+ this->object_->release();
delete this->object_;
}
else
{
- this->object_->layout(this->options_, this->symtab_, this->layout_,
- this->sd_);
- this->object_->add_symbols(this->symtab_, this->sd_);
+ 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;
// We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
-Task::Is_runnable_type
-Finish_group::is_runnable(Workqueue*)
+Task_token*
+Finish_group::is_runnable()
{
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
- return IS_BLOCKED;
- return IS_RUNNABLE;
+ return this->this_blocker_;
+ return NULL;
}
-Task_locker*
-Finish_group::locks(Workqueue* workqueue)
+void
+Finish_group::locks(Task_locker* tl)
{
- return new Task_locker_block(*this->next_blocker_, workqueue);
+ tl->add(this, this->next_blocker_);
}
// Loop over the archives until there are no new undefined symbols.
p != this->input_group_->end();
++p)
{
- Task_lock_obj<Archive> tl(**p);
+ Task_lock_obj<Archive> tl(this, *p);
- (*p)->add_symbols(this->options_, this->symtab_, this->layout_,
- this->input_objects_);
+ (*p)->add_symbols(this->symtab_, this->layout_,
+ this->input_objects_, this->mapfile_);
}
}
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";
+ ret += this->input_argument_->file().name();
+ return ret;
+}
+
} // End namespace gold.
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