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// 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 = obj->read_symbols();
workqueue->queue(new Add_symbols(this->symtab_, 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->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_->add_symbols(this->symtab_, this->sd_);
}
} // End namespace gold.
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