// gold.cc -- main linker functions
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <cstdio>
#include <cstring>
#include <unistd.h>
+#include <algorithm>
#include "libiberty.h"
#include "options.h"
+#include "debug.h"
#include "workqueue.h"
#include "dirsearch.h"
#include "readsyms.h"
#include "layout.h"
#include "reloc.h"
#include "defstd.h"
+#include "plugin.h"
namespace gold
{
gold_exit(bool status)
{
if (!status && parameters != NULL && parameters->options_valid())
- unlink_if_ordinary(parameters->output_file_name());
+ unlink_if_ordinary(parameters->options().output_file_name());
exit(status ? EXIT_SUCCESS : EXIT_FAILURE);
}
// We are out of memory, so try hard to print a reasonable message.
// Note that we don't try to translate this message, since the
// translation process itself will require memory.
- write(2, program_name, strlen(program_name));
- const char* const s = ": out of memory\n";
- write(2, s, strlen(s));
+
+ // LEN only exists to avoid a pointless warning when write is
+ // declared with warn_use_result, as when compiling with
+ // -D_USE_FORTIFY on GNU/Linux. Casting to void does not appear to
+ // work, at least not with gcc 4.3.0.
+
+ ssize_t len = write(2, program_name, strlen(program_name));
+ if (len >= 0)
+ {
+ const char* const s = ": out of memory\n";
+ len = write(2, s, strlen(s));
+ }
gold_exit(false);
}
Middle_runner(const General_options& options,
const Input_objects* input_objects,
Symbol_table* symtab,
- Layout* layout)
+ Layout* layout, Mapfile* mapfile)
: options_(options), input_objects_(input_objects), symtab_(symtab),
- layout_(layout)
+ layout_(layout), mapfile_(mapfile)
{ }
void
const Input_objects* input_objects_;
Symbol_table* symtab_;
Layout* layout_;
+ Mapfile* mapfile_;
};
void
Middle_runner::run(Workqueue* workqueue, const Task* task)
{
queue_middle_tasks(this->options_, task, this->input_objects_, this->symtab_,
- this->layout_, workqueue);
+ this->layout_, workqueue, this->mapfile_);
}
// Queue up the initial set of tasks for this link job.
Dirsearch& search_path,
const Command_line& cmdline,
Workqueue* workqueue, Input_objects* input_objects,
- Symbol_table* symtab, Layout* layout)
+ Symbol_table* symtab, Layout* layout, Mapfile* mapfile)
{
if (cmdline.begin() == cmdline.end())
gold_fatal(_("no input files"));
Task_token* next_blocker = new Task_token(true);
next_blocker->add_blocker();
workqueue->queue(new Read_symbols(options, input_objects, symtab, layout,
- &search_path, &*p, NULL, this_blocker,
- next_blocker));
+ &search_path, mapfile, &*p, NULL,
+ this_blocker, next_blocker));
+ this_blocker = next_blocker;
+ }
+
+ if (options.has_plugins())
+ {
+ Task_token* next_blocker = new Task_token(true);
+ next_blocker->add_blocker();
+ workqueue->queue(new Plugin_hook(options, input_objects, symtab, layout,
+ &search_path, mapfile, this_blocker,
+ next_blocker));
this_blocker = next_blocker;
}
workqueue->queue(new Task_function(new Middle_runner(options,
input_objects,
symtab,
- layout),
+ layout,
+ mapfile),
this_blocker,
"Task_function Middle_runner"));
}
const Input_objects* input_objects,
Symbol_table* symtab,
Layout* layout,
- Workqueue* workqueue)
+ Workqueue* workqueue,
+ Mapfile* mapfile)
{
+ // We have to support the case of not seeing any input objects, and
+ // generate an empty file. Existing builds depend on being able to
+ // pass an empty archive to the linker and get an empty object file
+ // out. In order to do this we need to use a default target.
if (input_objects->number_of_input_objects() == 0)
- {
- // We had some input files, but we weren't able to open any of
- // them.
- gold_fatal(_("no input files"));
- }
+ set_parameters_target(¶meters->default_target());
int thread_count = options.thread_count_middle();
if (thread_count == 0)
- thread_count = input_objects->number_of_input_objects();
+ thread_count = std::max(2, input_objects->number_of_input_objects());
workqueue->set_thread_count(thread_count);
// Now we have seen all the input files.
const bool doing_static_link = (!input_objects->any_dynamic()
- && !parameters->output_is_shared());
+ && !parameters->options().shared());
set_parameters_doing_static_link(doing_static_link);
if (!doing_static_link && options.is_static())
{
// We print out just the first .so we see; there may be others.
+ gold_assert(input_objects->dynobj_begin() != input_objects->dynobj_end());
gold_error(_("cannot mix -static with dynamic object %s"),
(*input_objects->dynobj_begin())->name().c_str());
}
+ if (!doing_static_link && parameters->options().relocatable())
+ gold_error(_("cannot mix -r with dynamic object %s"),
+ (*input_objects->dynobj_begin())->name().c_str());
+ if (!doing_static_link
+ && options.oformat_enum() != General_options::OBJECT_FORMAT_ELF)
+ gold_fatal(_("cannot use non-ELF output format with dynamic object %s"),
+ (*input_objects->dynobj_begin())->name().c_str());
+
+ if (is_debugging_enabled(DEBUG_SCRIPT))
+ layout->script_options()->print(stderr);
// For each dynamic object, record whether we've seen all the
// dynamic objects that it depends upon.
// TODO: if this is too slow, do this as a task, rather than inline.
symtab->detect_odr_violations(task, options.output_file_name());
+ // Create any output sections required by any linker script.
+ layout->create_script_sections();
+
// Define some sections and symbols needed for a dynamic link. This
// handles some cases we want to see before we read the relocs.
- layout->create_initial_dynamic_sections(input_objects, symtab);
+ layout->create_initial_dynamic_sections(symtab);
- // 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());
+ // Define symbols from any linker scripts.
+ layout->define_script_symbols(symtab);
- // Define __start and __stop symbols for output sections where
- // appropriate.
- layout->define_section_symbols(symtab, input_objects->target());
+ // Add any symbols named with -u options to the symbol table.
+ symtab->add_undefined_symbols_from_command_line();
+
+ // Attach sections to segments.
+ layout->attach_sections_to_segments();
+
+ if (!parameters->options().relocatable())
+ {
+ // Predefine standard symbols.
+ define_standard_symbols(symtab, layout);
+
+ // Define __start and __stop symbols for output sections where
+ // appropriate.
+ layout->define_section_symbols(symtab);
+ }
+
+ // Make sure we have symbols for any required group signatures.
+ layout->define_group_signatures(symtab);
// Read the relocations of the input files. We do this to find
// which symbols are used by relocations which require a GOT and/or
// 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));
+ if (parameters->options().define_common())
+ {
+ blocker->add_blocker();
+ workqueue->queue(new Allocate_commons_task(symtab, layout, mapfile,
+ symtab_lock, blocker));
+ }
// When all those tasks are complete, we can start laying out the
// output file.
+ // TODO(csilvers): figure out a more principled way to get the target
+ Target* target = const_cast<Target*>(¶meters->target());
workqueue->queue(new Task_function(new Layout_task_runner(options,
input_objects,
symtab,
- layout),
+ target,
+ layout,
+ mapfile),
blocker,
"Task_function Layout_task_runner"));
}
{
int thread_count = options.thread_count_final();
if (thread_count == 0)
- thread_count = input_objects->number_of_input_objects();
+ thread_count = std::max(2, input_objects->number_of_input_objects());
workqueue->set_thread_count(thread_count);
bool any_postprocessing_sections = layout->any_postprocessing_sections();
Task_token* final_blocker = new Task_token(true);
// Queue a task to write out the symbol table.
- if (!options.strip_all())
- {
- final_blocker->add_blocker();
- workqueue->queue(new Write_symbols_task(symtab,
- input_objects,
- layout->sympool(),
- layout->dynpool(),
- of,
- final_blocker));
- }
+ final_blocker->add_blocker();
+ workqueue->queue(new Write_symbols_task(layout,
+ symtab,
+ input_objects,
+ layout->sympool(),
+ layout->dynpool(),
+ of,
+ final_blocker));
// Queue a task to write out the output sections.
output_sections_blocker->add_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),
+ workqueue->queue(new Task_function(new Close_task_runner(&options, layout,
+ of),
final_blocker,
"Task_function Close_task_runner"));
}