168 lines
3.8 KiB
C++
168 lines
3.8 KiB
C++
// readsyms.cc -- read input file symbols for gold
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#include "gold.h"
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#include <cstring>
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#include "elfcpp.h"
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#include "options.h"
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#include "dirsearch.h"
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#include "object.h"
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#include "archive.h"
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#include "readsyms.h"
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namespace gold
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{
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// Class read_symbols.
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Read_symbols::~Read_symbols()
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{
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// The this_blocker_ and next_blocker_ pointers are passed on to the
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// Add_symbols task.
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}
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// Return whether a Read_symbols task is runnable. We need write
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// access to the symbol table. We can read an ordinary input file
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// immediately. For an archive specified using -l, we have to wait
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// until the search path is complete.
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Task::Is_runnable_type
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Read_symbols::is_runnable(Workqueue*)
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{
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if (this->input_.is_lib() && this->dirpath_.token().is_blocked())
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return IS_BLOCKED;
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return IS_RUNNABLE;
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}
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// Return a Task_locker for a Read_symbols task. We don't need any
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// locks here.
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Task_locker*
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Read_symbols::locks(Workqueue*)
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{
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return NULL;
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}
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// Run a Read_symbols task. This is where we actually read the
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// symbols and relocations.
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void
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Read_symbols::run(Workqueue* workqueue)
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{
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Input_file* input_file = new Input_file(this->input_);
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input_file->open(this->options_, this->dirpath_);
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// Read enough of the file to pick up the entire ELF header.
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int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
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off_t bytes;
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const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes);
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if (bytes >= 4)
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{
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static unsigned char elfmagic[4] =
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{
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elfcpp::ELFMAG0, elfcpp::ELFMAG1,
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elfcpp::ELFMAG2, elfcpp::ELFMAG3
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};
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if (memcmp(p, elfmagic, 4) == 0)
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{
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// This is an ELF object.
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Object* obj = make_elf_object(this->input_.name(), input_file, 0,
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p, bytes);
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this->input_objects_->add_object(obj);
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Read_symbols_data* sd = new Read_symbols_data;
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obj->read_symbols(sd);
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workqueue->queue(new Add_symbols(this->symtab_, this->layout_,
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obj, sd,
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this->this_blocker_,
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this->next_blocker_));
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// Opening the file locked it, so now we need to unlock it.
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input_file->file().unlock();
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return;
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}
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}
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if (bytes >= Archive::sarmag)
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{
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if (memcmp(p, Archive::armag, Archive::sarmag) == 0)
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{
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// This is an archive.
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Archive* arch = new Archive(this->input_.name(), input_file);
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arch->setup();
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workqueue->queue(new Add_archive_symbols(this->symtab_,
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this->layout_,
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this->input_objects_,
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arch,
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this->this_blocker_,
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this->next_blocker_));
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return;
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}
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}
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// Here we have to handle archives and any other input file
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// types we need.
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fprintf(stderr, _("%s: %s: not an object or archive\n"),
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program_name, input_file->file().filename().c_str());
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gold_exit(false);
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}
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// Class Add_symbols.
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Add_symbols::~Add_symbols()
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{
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if (this->this_blocker_ != NULL)
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delete this->this_blocker_;
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// next_blocker_ is deleted by the task associated with the next
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// input file.
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}
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// We are blocked by this_blocker_. We block next_blocker_. We also
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// lock the file.
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Task::Is_runnable_type
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Add_symbols::is_runnable(Workqueue*)
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{
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if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
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return IS_BLOCKED;
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if (this->object_->is_locked())
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return IS_LOCKED;
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return IS_RUNNABLE;
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}
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class Add_symbols::Add_symbols_locker : public Task_locker
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{
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public:
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Add_symbols_locker(Task_token& token, Workqueue* workqueue,
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Object* object)
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: blocker_(token, workqueue), objlock_(*object)
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{ }
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private:
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Task_locker_block blocker_;
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Task_locker_obj<Object> objlock_;
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};
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Task_locker*
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Add_symbols::locks(Workqueue* workqueue)
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{
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return new Add_symbols_locker(*this->next_blocker_, workqueue,
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this->object_);
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}
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void
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Add_symbols::run(Workqueue*)
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{
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this->object_->layout(this->layout_, this->sd_);
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this->object_->add_symbols(this->symtab_, this->sd_);
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delete this->sd_;
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this->sd_ = NULL;
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}
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} // End namespace gold.
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