mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-27 03:51:15 +08:00
008db82ec1
dynamic object.
314 lines
8.0 KiB
C++
314 lines
8.0 KiB
C++
// readsyms.cc -- read input file symbols for gold
|
|
|
|
#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"
|
|
|
|
namespace gold
|
|
{
|
|
|
|
// Class read_symbols.
|
|
|
|
Read_symbols::~Read_symbols()
|
|
{
|
|
// The this_blocker_ and next_blocker_ pointers are passed on to the
|
|
// Add_symbols task.
|
|
}
|
|
|
|
// 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*)
|
|
{
|
|
if (this->input_argument_->is_file()
|
|
&& this->input_argument_->file().is_lib()
|
|
&& this->dirpath_.token().is_blocked())
|
|
return IS_BLOCKED;
|
|
|
|
return IS_RUNNABLE;
|
|
}
|
|
|
|
// Return a Task_locker for a Read_symbols task. We don't need any
|
|
// locks here.
|
|
|
|
Task_locker*
|
|
Read_symbols::locks(Workqueue*)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
// Run a Read_symbols task. This is where we actually read the
|
|
// symbols and relocations.
|
|
|
|
void
|
|
Read_symbols::run(Workqueue* workqueue)
|
|
{
|
|
if (this->input_argument_->is_group())
|
|
{
|
|
gold_assert(this->input_group_ == NULL);
|
|
this->do_group(workqueue);
|
|
return;
|
|
}
|
|
|
|
Input_file* input_file = new Input_file(&this->input_argument_->file());
|
|
input_file->open(this->options_, this->dirpath_);
|
|
|
|
// 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)
|
|
{
|
|
static unsigned char elfmagic[4] =
|
|
{
|
|
elfcpp::ELFMAG0, elfcpp::ELFMAG1,
|
|
elfcpp::ELFMAG2, elfcpp::ELFMAG3
|
|
};
|
|
if (memcmp(p, elfmagic, 4) == 0)
|
|
{
|
|
// This is an ELF object.
|
|
|
|
Object* obj = make_elf_object(input_file->filename(),
|
|
input_file, 0, p, bytes);
|
|
|
|
// 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())
|
|
{
|
|
fprintf(stderr,
|
|
_("%s: %s: ordinary object found in input group\n"),
|
|
program_name, input_file->name());
|
|
gold_exit(false);
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (bytes >= Archive::sarmag)
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
|
|
if (bytes == 0)
|
|
{
|
|
fprintf(stderr, _("%s: %s: file is empty\n"),
|
|
program_name, input_file->file().filename().c_str());
|
|
gold_exit(false);
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
|
|
// 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();
|
|
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));
|
|
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_));
|
|
}
|
|
|
|
// 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::Is_runnable_type
|
|
Add_symbols::is_runnable(Workqueue*)
|
|
{
|
|
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
|
|
return IS_BLOCKED;
|
|
if (this->object_->is_locked())
|
|
return IS_LOCKED;
|
|
return IS_RUNNABLE;
|
|
}
|
|
|
|
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)
|
|
{
|
|
return new Add_symbols_locker(*this->next_blocker_, workqueue,
|
|
this->object_);
|
|
}
|
|
|
|
// Add the symbols in the object to the symbol table.
|
|
|
|
void
|
|
Add_symbols::run(Workqueue*)
|
|
{
|
|
if (!this->input_objects_->add_object(this->object_))
|
|
{
|
|
// FIXME: We need to close the descriptor here.
|
|
delete this->object_;
|
|
}
|
|
else
|
|
{
|
|
this->object_->layout(this->options_, this->symtab_, this->layout_,
|
|
this->sd_);
|
|
this->object_->add_symbols(this->symtab_, this->sd_);
|
|
}
|
|
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::Is_runnable_type
|
|
Finish_group::is_runnable(Workqueue*)
|
|
{
|
|
if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
|
|
return IS_BLOCKED;
|
|
return IS_RUNNABLE;
|
|
}
|
|
|
|
Task_locker*
|
|
Finish_group::locks(Workqueue* workqueue)
|
|
{
|
|
return new Task_locker_block(*this->next_blocker_, workqueue);
|
|
}
|
|
|
|
// 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(**p);
|
|
|
|
(*p)->add_symbols(this->options_, this->symtab_, this->layout_,
|
|
this->input_objects_);
|
|
}
|
|
}
|
|
|
|
// Delete all the archives now that we no longer need them.
|
|
for (Input_group::const_iterator p = this->input_group_->begin();
|
|
p != this->input_group_->end();
|
|
++p)
|
|
delete *p;
|
|
delete this->input_group_;
|
|
}
|
|
|
|
} // End namespace gold.
|