#include "dirsearch.h"
#include "readsyms.h"
#include "symtab.h"
+#include "common.h"
+#include "object.h"
+#include "layout.h"
+#include "reloc.h"
+#include "defstd.h"
namespace gold
{
abort();
}
-} // End namespace gold.
+// This class arranges to run the functions done in the middle of the
+// link. It is just a closure.
-namespace
+class Middle_runner : public Task_function_runner
{
+ public:
+ Middle_runner(const General_options& options,
+ const Input_objects* input_objects,
+ Symbol_table* symtab,
+ Layout* layout)
+ : options_(options), input_objects_(input_objects), symtab_(symtab),
+ layout_(layout)
+ { }
-using namespace gold;
+ void
+ run(Workqueue*);
+
+ private:
+ const General_options& options_;
+ const Input_objects* input_objects_;
+ Symbol_table* symtab_;
+ Layout* layout_;
+};
+
+void
+Middle_runner::run(Workqueue* workqueue)
+{
+ queue_middle_tasks(this->options_, this->input_objects_, this->symtab_,
+ this->layout_, workqueue);
+}
// Queue up the initial set of tasks for this link job.
void
queue_initial_tasks(const General_options& options,
const Dirsearch& search_path,
- const Command_line::Input_argument_list& inputs,
- Workqueue* workqueue, Symbol_table* symtab)
+ const Command_line& cmdline,
+ Workqueue* workqueue, Input_objects* input_objects,
+ Symbol_table* symtab, Layout* layout)
{
- if (inputs.empty())
+ if (cmdline.begin() == cmdline.end())
gold_fatal(_("no input files"), false);
// Read the input files. We have to add the symbols to the symbol
// each input file. We associate the blocker with the following
// input file, to give us a convenient place to delete it.
Task_token* this_blocker = NULL;
- for (Command_line::Input_argument_list::const_iterator p = inputs.begin();
- p != inputs.end();
+ for (Command_line::const_iterator p = cmdline.begin();
+ p != cmdline.end();
++p)
{
Task_token* next_blocker = new Task_token();
next_blocker->add_blocker();
- workqueue->queue(new Read_symbols(options, symtab, search_path,
- *p, this_blocker, next_blocker));
+ workqueue->queue(new Read_symbols(options, input_objects, symtab, layout,
+ search_path, *p, NULL, this_blocker,
+ next_blocker));
this_blocker = next_blocker;
}
- // workqueue->queue(new Layout(options, inputs, this_blocker));
+ workqueue->queue(new Task_function(new Middle_runner(options,
+ input_objects,
+ symtab,
+ layout),
+ this_blocker));
+}
+
+// Queue up the middle set of tasks. These are the tasks which run
+// after all the input objects have been found and all the symbols
+// have been read, but before we lay out the output file.
+
+void
+queue_middle_tasks(const General_options& options,
+ const Input_objects* input_objects,
+ Symbol_table* symtab,
+ Layout* layout,
+ Workqueue* workqueue)
+{
+ // Predefine standard symbols. This should be fast, so we don't
+ // bother to create a task for it.
+ define_standard_symbols(symtab, layout, input_objects->target());
+
+ // Read the relocations of the input files. We do this to find
+ // which symbols are used by relocations which require a GOT and/or
+ // a PLT entry, or a COPY reloc. When we implement garbage
+ // collection we will do it here by reading the relocations in a
+ // breadth first search by references.
+ //
+ // We could also read the relocations during the first pass, and
+ // mark symbols at that time. That is how the old GNU linker works.
+ // Doing that is more complex, since we may later decide to discard
+ // some of the sections, and thus change our minds about the types
+ // of references made to the symbols.
+ Task_token* blocker = new Task_token();
+ Task_token* symtab_lock = new Task_token();
+ for (Input_objects::Object_list::const_iterator p = input_objects->begin();
+ p != input_objects->end();
+ ++p)
+ {
+ // We can read and process the relocations in any order. But we
+ // only want one task to write to the symbol table at a time.
+ // So we queue up a task for each object to read the
+ // relocations. That task will in turn queue a task to wait
+ // until it can write to the symbol table.
+ blocker->add_blocker();
+ workqueue->queue(new Read_relocs(options, symtab, layout, *p,
+ symtab_lock, blocker));
+ }
+
+ // Allocate common symbols. This requires write access to the
+ // symbol table, but is independent of the relocation processing.
+ blocker->add_blocker();
+ workqueue->queue(new Allocate_commons_task(options, symtab, layout,
+ symtab_lock, blocker));
+
+ // When all those tasks are complete, we can start laying out the
+ // output file.
+ workqueue->queue(new Task_function(new Layout_task_runner(options,
+ input_objects,
+ symtab,
+ layout),
+ blocker));
}
-} // end anonymous namespace.
+// Queue up the final set of tasks. This is called at the end of
+// Layout_task.
+
+void
+queue_final_tasks(const General_options& options,
+ const Input_objects* input_objects,
+ const Symbol_table* symtab,
+ const Layout* layout,
+ Workqueue* workqueue,
+ Output_file* of)
+{
+ // Use a blocker to block the final cleanup task.
+ Task_token* final_blocker = new Task_token();
+
+ // Queue a task for each input object to relocate the sections and
+ // write out the local symbols.
+ for (Input_objects::Object_list::const_iterator p = input_objects->begin();
+ p != input_objects->end();
+ ++p)
+ {
+ final_blocker->add_blocker();
+ workqueue->queue(new Relocate_task(options, symtab, layout, *p, of,
+ final_blocker));
+ }
+
+ // Queue a task to write out the symbol table.
+ final_blocker->add_blocker();
+ workqueue->queue(new Write_symbols_task(symtab, input_objects->target(),
+ layout->sympool(), of,
+ final_blocker));
+
+ // Queue a task to write out everything else.
+ final_blocker->add_blocker();
+ workqueue->queue(new Write_data_task(layout, of, final_blocker));
+
+ // Queue a task to close the output file. This will be blocked by
+ // FINAL_BLOCKER.
+ workqueue->queue(new Task_function(new Close_task_runner(of),
+ final_blocker));
+}
+
+} // End namespace gold.
+
+using namespace gold;
int
main(int argc, char** argv)
// The work queue.
gold::Workqueue workqueue(command_line.options());
+ // The list of input objects.
+ Input_objects input_objects;
+
// The symbol table.
Symbol_table symtab;
+ // The layout object.
+ Layout layout(command_line.options());
+
// Get the search path from the -L options.
Dirsearch search_path;
search_path.add(&workqueue, command_line.options().search_path());
// Queue up the first set of tasks.
queue_initial_tasks(command_line.options(), search_path,
- command_line.inputs(), &workqueue, &symtab);
+ command_line, &workqueue, &input_objects,
+ &symtab, &layout);
// Run the main task processing loop.
workqueue.process();