mirror of
https://sourceware.org/git/binutils-gdb.git
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14bfc3f555
point of symbol resolution and can now issue a multiple definition error. Also added target selection infrastructure.
125 lines
2.8 KiB
C++
125 lines
2.8 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 "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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// We don't keep track of Input_file objects, so this is a memory
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// leak.
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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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Read_symbols_data sd = obj->read_symbols();
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workqueue->queue(new Add_symbols(this->symtab_, 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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// Here we have to handle archives and any other input file
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// types we need.
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gold_fatal("only objects are currently supported", 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_.
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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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return IS_RUNNABLE;
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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 Task_locker_block(*this->next_blocker_, workqueue);
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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_->add_symbols(this->symtab_, this->sd_);
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}
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} // End namespace gold.
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