mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-15 16:19:24 +00:00
6d03d481a0
* Makefile.am (CCFILES): Add gc.cc. (HFILES): Add gc.h. * Makefile.in: Regenerate. * gold.cc (Gc_runner): New class. (queue_initial_tasks): Call garbage collection related tasks when corresponding options are invoked. (queue_middle_gc_tasks): New function. (queue_middle_tasks): Reorder tasks to allow relocs to be read and processed early before laying out sections during garbage collection. * gold.h (queue_middle_gc_tasks): New function. (is_prefix_of): Move from "layout.cc". * i386.cc (Target_i386::gc_process_relocs): New function. * layout.cc (is_prefix_of): Remove. Move to "gold.h" * main.cc (main): Create object of class "Garbage_collection". * object.cc (Relobj::copy_symbols_data): New function. (Relobj::is_section_name_included): New function. (Sized_relobj::do_layout): Allow this function to be called twice during garbage collection and defer layout of section during the first call. * object.h (Relobj::get_symbols_data): New function. (Relobj::is_section_name_included): New function. (Relobj::copy_symbols_data): New function. (Relobj::set_symbols_data): New function. (Relobj::get_relocs_data): New function. (Relobj::set_relocs_data): New function. (Relobj::is_output_section_offset_invalid): New pure virtual function. (Relobj::gc_process_relocs): New function. (Relobj::do_gc_process_relocs): New pure virtual function. (Relobj::sd_): New data member. (Sized_relobj::is_output_section_offset_invalid): New function. (Sized_relobj::do_gc_process_relocs): New function. * options.h (General_options::gc_sections): Modify to not be a no-op. (General_options::print_gc_sections): New option. * plugin.cc (Plugin_finish::run): Remove function call to Plugin_manager::layout_deferred_objects. Move it to "gold.cc". * powerpc.cc (Target_powerpc::gc_process_relocs): New function. * reloc.cc (Read_relocs::run): Add task to process relocs and determine unreferenced sections when doing garbage collection. (Gc_process_relocs): New class. (Sized_relobj::do_gc_process_relocs): New function. (Sized_relobj::do_scan_relocs): Don't try to scan the relocs for sections that are garbage collected. * reloc.h (Gc_process_relocs): New class. * sparc.cc (Target_sparc::gc_process_relocs): New function. * symtab.cc (Symbol::should_add_dynsym_entry): Do not add entries for symbols whose corresponding sections are garbage collected. (Symbol_table::Symbol_table): Add new parameter for the garbage collection object. (Symbol_table::gc_mark_undef_symbols): New function. (Symbol_table::gc_mark_symbol_for_shlib): New function. (Symbol_table::gc_mark_dyn_syms): New function. (Symbol_table::resolve): Do not treat symbols seen in dynamic objects as garbage. (Symbol_table::add_from_object): Likewise. (Symbol_table::add_from_relobj): When building shared objects, do not treat externally visible symbols as garbage. (Symbol_table::sized_finalize_symbol): Do not check dynamic symbol table information for static and relocatable links. * symtab.h (Symbol_table::set_gc): New function. (Symbol_table::gc): New function. (Symbol_table::gc_mark_undef_symbols): New function. (Symbol_table::gc_mark_symbol_for_shlib): New function. (Symbol_table::gc_mark_dyn_syms): New function. (Symbol_table::gc_): New data member. * target.h (Sized_target::gc_process_relocs): New pure virtual function. * x86_64.cc (Target_x86_64::gc_process_relocs): New function. * testsuite/testfile.cc (Target_test::gc_process_relocs): New function.
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
// gc.cc -- garbage collection of unused sections
|
|
|
|
// Copyright 2009 Free Software Foundation, Inc.
|
|
// Written by Sriraman Tallam <tmsriram@google.com>.
|
|
|
|
// This file is part of gold.
|
|
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
|
// MA 02110-1301, USA.
|
|
|
|
|
|
#include "gold.h"
|
|
#include "object.h"
|
|
#include "gc.h"
|
|
#include "symtab.h"
|
|
|
|
namespace gold
|
|
{
|
|
|
|
// Garbage collection uses a worklist style algorithm to determine the
|
|
// transitive closure of all referenced sections.
|
|
void
|
|
Garbage_collection::do_transitive_closure()
|
|
{
|
|
while (!this->worklist().empty())
|
|
{
|
|
// Add elements from the work list to the referenced list
|
|
// one by one.
|
|
Section_id entry = this->worklist().front();
|
|
this->worklist().pop();
|
|
if (this->referenced_list().find(entry)
|
|
== this->referenced_list().end())
|
|
{
|
|
this->referenced_list().insert(entry);
|
|
}
|
|
else
|
|
{
|
|
continue;
|
|
}
|
|
Garbage_collection::Section_ref::iterator find_it =
|
|
this->section_reloc_map().find(entry);
|
|
if (find_it == this->section_reloc_map().end())
|
|
continue;
|
|
Garbage_collection::Sections_reachable v = find_it->second;
|
|
// Scan the vector of references for each work_list entry.
|
|
for (Garbage_collection::Sections_reachable::iterator it_v = v.begin();
|
|
it_v != v.end();
|
|
++it_v)
|
|
{
|
|
// Do not add already processed sections to the work_list.
|
|
if (this->referenced_list().find(*it_v)
|
|
== this->referenced_list().end())
|
|
{
|
|
this->worklist().push(*it_v);
|
|
}
|
|
}
|
|
}
|
|
this->worklist_ready();
|
|
}
|
|
|
|
} // End namespace gold.
|
|
|