167 lines
3.8 KiB
C++
167 lines
3.8 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 "object.h"
|
|
#include "archive.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 need write
|
|
// access to the symbol table. 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_.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)
|
|
{
|
|
Input_file* input_file = new Input_file(this->input_);
|
|
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(this->input_.name(), input_file, 0,
|
|
p, bytes);
|
|
|
|
this->input_objects_->add_object(obj);
|
|
|
|
Read_symbols_data* sd = new Read_symbols_data;
|
|
obj->read_symbols(sd);
|
|
workqueue->queue(new Add_symbols(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_.name(), input_file);
|
|
arch->setup();
|
|
workqueue->queue(new Add_archive_symbols(this->symtab_,
|
|
this->layout_,
|
|
this->input_objects_,
|
|
arch,
|
|
this->this_blocker_,
|
|
this->next_blocker_));
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Here we have to handle archives and 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);
|
|
}
|
|
|
|
// 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_);
|
|
}
|
|
|
|
void
|
|
Add_symbols::run(Workqueue*)
|
|
{
|
|
this->object_->layout(this->layout_, this->sd_);
|
|
this->object_->add_symbols(this->symtab_, this->sd_);
|
|
delete this->sd_;
|
|
this->sd_ = NULL;
|
|
}
|
|
|
|
} // End namespace gold.
|