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binutils-gdb/gold/script.h
Cary Coutant cdc29364d1 * archive.cc (Archive::include_member): Adjust call to
report_object.
	(Add_archive_symbols::run): Track argument serial numbers.
	(Lib_group::include_member): Likewise.
	(Add_lib_group_symbols::run): Adjust call to report_archive_begin.
	* archive.h (Incremental_archive_entry::Archive_member):
	Initialize arg_serial_.
	(Archive_member::arg_serial_): New data member.
	* dynobj.cc (Dynobj::Dynobj): Allow input_file_ to be NULL.
	(Sized_dynobj::do_add_symbols): Track symbols when doing an
	incremental link.
	(Sized_dynobj::do_for_all_local_got_entries): New function.
	* dynobj.h: (Sized_dynobj::do_for_all_local_got_entries): New
	function.
	* fileread.cc (get_mtime): New function.
	* fileread.h (get_mtime): New function.
	* gold.cc (queue_initial_tasks): Check for incremental update.
	(process_incremental_input): New function.
	(queue_middle_tasks): Don't force valid target for incremental
	update.
	* incremental-dump.cc (find_input_containing_global): Adjust
	size of symbol info entry.
	(dump_incremental_inputs): Dump argument serial number and
	in_system_directory flag; bias shndx by 1; print symbol names
	when dumping per-file symbol lists; use new symbol info readers.
	* incremental.cc
	(Output_section_incremental_inputs:update_data_size): New function.
	(Sized_incremental_binary::setup_readers): Setup input readers
	for each input file; build maps for files added from libraries
	and scripts.
	(Sized_incremental_binary::check_input_args): New function.
	(Sized_incremental_binary::do_check_inputs): Build map of argument
	serial numbers to input arguments.
	(Sized_incremental_binary::do_file_has_changed): Rename
	do_file_is_unchanged to this; compare file modification times.
	(Sized_incremental_binary::do_init_layout): New function.
	(Sized_incremental_binary::do_reserve_layout): New function.
	(Sized_incremental_binary::do_get_input_reader): Remove.
	(Sized_incremental_binary::get_symtab_view): New function.
	(Incremental_checker::can_incrementally_link_output_file): Remove.
	(Incremental_inputs::report_command_line): Exclude --debug options.
	(Incremental_inputs::report_archive_begin): Add parameter; track
	argument serial numbers; don't put input file entry for archive
	before archive members.
	(Incremental_inputs::report_archive_end): Put input file entry
	for archive after archive members.
	(Incremental_inputs::report_object): Add parameter; track argument
	serial numbers and in_system_directory flag.
	(Incremental_inputs::report_script): Add parameter; track argument
	serial numbers.
	(Output_section_incremental_inputs::set_final_data_size): Adjust
	size of symbol info entry; check for forwarding symbols.
	(Output_section_incremental_inputs::write_input_files): Write
	in_system_directory flag and argument serial number.
	(Output_section_incremental_inputs::write_info_blocks): Map section
	indices between incremental info and original input file; store
	input section index for each symbol.
	(class Local_got_offset_visitor): Derive from Got_offset_list::Visitor;
	change operator() to visit().
	(class Global_got_offset_visitor): Likewise.
	(class Global_symbol_visitor_got_plt):
	(Output_section_incremental_inputs::write_got_plt): Use new visitor
	classes.
	(Sized_incr_relobj::Sized_incr_relobj): New constructor.
	(Sized_incr_relobj::do_read_symbols): New function.
	(Sized_incr_relobj::do_layout): New function.
	(Sized_incr_relobj::do_layout_deferred_sections): New function.
	(Sized_incr_relobj::do_add_symbols): New function.
	(Sized_incr_relobj::do_should_include_member): New function.
	(Sized_incr_relobj::do_for_all_global_symbols): New function.
	(Sized_incr_relobj::do_for_all_local_got_entries): New function.
	(Sized_incr_relobj::do_section_size): New function.
	(Sized_incr_relobj::do_section_name): New function.
	(Sized_incr_relobj::do_section_contents): New function.
	(Sized_incr_relobj::do_section_flags): New function.
	(Sized_incr_relobj::do_section_entsize): New function.
	(Sized_incr_relobj::do_section_address): New function.
	(Sized_incr_relobj::do_section_type): New function.
	(Sized_incr_relobj::do_section_link): New function.
	(Sized_incr_relobj::do_section_info): New function.
	(Sized_incr_relobj::do_section_addralign): New function.
	(Sized_incr_relobj::do_initialize_xindex): New function.
	(Sized_incr_relobj::do_get_global_symbol_counts): New function.
	(Sized_incr_relobj::do_read_relocs): New function.
	(Sized_incr_relobj::do_gc_process_relocs): New function.
	(Sized_incr_relobj::do_scan_relocs): New function.
	(Sized_incr_relobj::do_count_local_symbols): New function.
	(Sized_incr_relobj::do_finalize_local_symbols): New function.
	(Sized_incr_relobj::do_set_local_dynsym_indexes): New function.
	(Sized_incr_relobj::do_set_local_dynsym_offset): New function.
	(Sized_incr_relobj::do_relocate): New function.
	(Sized_incr_relobj::do_set_section_offset): New function.
	(Sized_incr_dynobj::Sized_incr_dynobj): New function.
	(Sized_incr_dynobj::do_read_symbols): New function.
	(Sized_incr_dynobj::do_layout): New function.
	(Sized_incr_dynobj::do_add_symbols): New function.
	(Sized_incr_dynobj::do_should_include_member): New function.
	(Sized_incr_dynobj::do_for_all_global_symbols): New function.
	(Sized_incr_dynobj::do_for_all_local_got_entries): New function.
	(Sized_incr_dynobj::do_section_size): New function.
	(Sized_incr_dynobj::do_section_name): New function.
	(Sized_incr_dynobj::do_section_contents): New function.
	(Sized_incr_dynobj::do_section_flags): New function.
	(Sized_incr_dynobj::do_section_entsize): New function.
	(Sized_incr_dynobj::do_section_address): New function.
	(Sized_incr_dynobj::do_section_type): New function.
	(Sized_incr_dynobj::do_section_link): New function.
	(Sized_incr_dynobj::do_section_info): New function.
	(Sized_incr_dynobj::do_section_addralign): New function.
	(Sized_incr_dynobj::do_initialize_xindex): New function.
	(Sized_incr_dynobj::do_get_global_symbol_counts): New function.
	(make_sized_incremental_object): New function.
	(Incremental_library::copy_unused_symbols): New function.
	(Incremental_library::do_for_all_unused_symbols): New function.
	* incremental.h (enum Incremental_input_flags): New type.
	(class Incremental_checker): Remove.
	(Incremental_input_entry::Incremental_input_entry): Add argument
	serial number.
	(Incremental_input_entry::arg_serial): New function.
	(Incremental_input_entry::set_is_in_system_directory): New function.
	(Incremental_input_entry::is_in_system_directory): New function.
	(Incremental_input_entry::arg_serial_): New data member.
	(Incremental_input_entry::is_in_system_directory_): New data member.
	(class Script_info): Move here from script.h.
	(Script_info::Script_info): Add filename parameter.
	(Script_info::filename): New function.
	(Script_info::filename_): New data member.
	(Incremental_script_entry::Incremental_script_entry): Add argument
	serial number.
	(Incremental_object_entry::Incremental_object_entry): Likewise.
	(Incremental_object_entry::add_input_section): Build list of input
	sections with map to original shndx.
	(Incremental_object_entry::get_input_section_index): New function.
	(Incremental_object_entry::shndx_): New data member.
	(Incremental_object_entry::name_key_): Rename; adjust all refs.
	(Incremental_object_entry::sh_size_): Rename; adjust all refs.
	(Incremental_archive_entry::Incremental_archive_entry): Add argument
	serial number.
	(Incremental_inputs::report_archive_begin): Likewise.
	(Incremental_inputs::report_object): Likewise.
	(Incremental_inputs::report_script): Likewise.
	(class Incremental_global_symbol_reader): New class.
	(Incremental_input_entry_reader::Incremental_input_entry_reader): Read
	and store flags and input file type.
	(Incremental_input_entry_reader::arg_serial): New function.
	(Incremental_input_entry_reader::type): Extract type from flags.
	(Incremental_input_entry_reader::is_in_system_directory): New function.
	(Incremental_input_entry_reader::get_input_section_count): Call
	accessor function for type.
	(Incremental_input_entry_reader::get_symbol_offset): Call accessor
	function for type; adjust size of global symbol entry.
	(Incremental_input_entry_reader::get_global_symbol_count): Call
	accessor function for type.
	(Incremental_input_entry_reader::get_object_count): Likewise.
	(Incremental_input_entry_reader::get_object_offset): Likewise.
	(Incremental_input_entry_reader::get_member_count): Likewise.
	(Incremental_input_entry_reader::get_unused_symbol_count): Likewise.
	(Incremental_input_entry_reader::get_member_offset): Likewise.
	(Incremental_input_entry_reader::get_unused_symbol): Likewise.
	(Incremental_input_entry_reader::Global_symbol_info): Remove.
	(Incremental_input_entry_reader::get_global_symbol_info): Remove.
	(Incremental_input_entry_reader::get_global_symbol_reader): New
	function.
	(Incremental_input_entry_reader::get_output_symbol_index): New
	function.
	(Incremental_input_entry_reader::type_): Remove.
	(Incremental_input_entry_reader::flags_): New data member.
	(Incremental_inputs_reader::input_file_offset): New function.
	(Incremental_inputs_reader::input_file_index): New function.
	(Incremental_inputs_reader::input_file): Call input_file_offset.
	(Incremental_inputs_reader::input_file_at_offset): New function.
	(Incremental_relocs_reader::get_r_type): Reformat.
	(Incremental_relocs_reader::get_r_shndx): Reformat.
	(Incremental_relocs_reader::get_r_offset): Reformat.
	(Incremental_relocs_reader::data): New function.
	(Incremental_binary::Incremental_binary): Initialize new data members.
	(Incremental_binary::check_inputs): Add cmdline parameter.
	(Incremental_binary::file_is_unchanged): Remove.
	(Input_reader::arg_serial): New function.
	(Input_reader::get_unused_symbol_count): New function.
	(Input_reader::get_unused_symbol): New function.
	(Input_reader::do_arg_serial): New function.
	(Input_reader::do_get_unused_symbol_count): New function.
	(Input_reader::do_get_unused_symbol): New function.
	(Incremental_binary::input_file_count): New function.
	(Incremental_binary::get_input_reader): Change signature to use
	index instead of filename.
	(Incremental_binary::file_has_changed): New function.
	(Incremental_binary::get_input_argument): New function.
	(Incremental_binary::get_library): New function.
	(Incremental_binary::get_script_info): New function.
	(Incremental_binary::init_layout): New function.
	(Incremental_binary::reserve_layout): New function.
	(Incremental_binary::output_file): New function.
	(Incremental_binary::do_check_inputs): New function.
	(Incremental_binary::do_file_is_unchanged): Remove.
	(Incremental_binary::do_file_has_changed): New function.
	(Incremental_binary::do_init_layout): New function.
	(Incremental_binary::do_reserve_layout): New function.
	(Incremental_binary::do_input_file_count): New function.
	(Incremental_binary::do_get_input_reader): Change signature.
	(Incremental_binary::input_args_map_): New data member.
	(Incremental_binary::library_map_): New data member.
	(Incremental_binary::script_map_): New data member.
	(Sized_incremental_binary::Sized_incremental_binary): Initialize
	new data members.
	(Sized_incremental_binary::output_section): New function.
	(Sized_incremental_binary::inputs_reader): Add const.
	(Sized_incremental_binary::symtab_reader): Add const.
	(Sized_incremental_binary::relocs_reader): Add const.
	(Sized_incremental_binary::got_plt_reader): Add const.
	(Sized_incremental_binary::get_symtab_view): New function.
	(Sized_incremental_binary::Inputs_reader): New typedef.
	(Sized_incremental_binary::Input_entry_reader): New typedef.
	(Sized_incremental_binary::do_check_inputs): Add cmdline parameter.
	(Sized_incremental_binary::do_file_is_unchanged): Remove.
	(Sized_incremental_binary::do_file_has_changed): New function.
	(Sized_incremental_binary::do_init_layout): New function.
	(Sized_incremental_binary::do_reserve_layout): New function.
	(Sized_input_reader::Inputs_reader): Remove.
	(Sized_input_reader::Input_entry_reader): Remove.
	(Sized_input_reader::do_arg_serial): New function.
	(Sized_input_reader::do_get_unused_symbol_count): New function.
	(Sized_input_reader::do_get_unused_symbol): New function.
	(Sized_incremental_binary::do_input_file_count): New function.
	(Sized_incremental_binary::do_get_input_reader): Change signature;
	use index instead of filename.
	(Sized_incremental_binary::section_map_): New data member.
	(Sized_incremental_binary::input_entry_readers_): New data member.
	(class Sized_incr_relobj): New class.
	(class Sized_incr_dynobj): New class.
	(make_sized_incremental_object): New function.
	(class Incremental_library): New class.
	* layout.cc (Free_list::num_lists): New static data member.
	(Free_list::num_nodes): New static data member.
	(Free_list::num_removes): New static data member.
	(Free_list::num_remove_visits): New static data member.
	(Free_list::num_allocates): New static data member.
	(Free_list::num_allocate_visits): New static data member.
	(Free_list::init): New function.
	(Free_list::remove): New function.
	(Free_list::allocate): New function.
	(Free_list::dump): New function.
	(Free_list::print_stats): New function.
	(Layout_task_runner::run): Resize output file for incremental updates.
	(Layout::Layout): Initialize new data members.
	(Layout::set_incremental_base): New function.
	(Layout::init_fixed_output_section): New function.
	(Layout::layout_eh_frame): Do not build .eh_frame_hdr section for
	incremental updates.
	(Layout::create_gold_note): Do not create gold note section for
	incremental updates.
	(Layout::set_segment_offsets): Do not recalculate RELRO alignment
	for incremental updates.
	(Layout::set_section_offsets): For incremental updates, allocate space
	from free list.
	(Layout::create_symtab_sections): Layout with offsets relative to
	start of section; for incremental updates, allocate space from free
	list.
	(Layout::create_shdrs): For incremental updates, allocate space from
	free list.
	(Layout::finish_dynamic_section): For incremental updates, do not
	check --as-needed (fixed in subsequent patch).
	* layout.h (class Free_list): New class.
	(Layout::set_incremental_base): New function.
	(Layout::incremental_base): New function.
	(Layout::init_fixed_output_section): New function.
	(Layout::allocate): New function.
	(Layout::incremental_base_): New data member.
	(Layout::free_list_): New data member.
	* main.cc (main): Print Free_list statistics.
	* object.cc (Relobj::finalize_incremental_relocs): Add
	clear_counts parameter; clear counts only when clear_counts is set.
	(Sized_relobj::Sized_relobj): Initialize new base class.
	(Sized_relobj::do_layout): Don't report special sections.
	(Sized_relobj::do_for_all_local_got_entries): New function.
	(Sized_relobj::write_local_symbols): Add symtab_off parameter; add
	symtab_off to all symbol table offsets.
	(Sized_relobj::do_get_global_symbol_counts): Add typename keyword.
	* object.h (class Got_offset_list): Move to top of file.
	(Object::Object): Allow case where input_file == NULL.
	(Object::~Object): Likewise.
	(Object::input_file): Assert that input_file != NULL.
	(Object::lock): Allow case where input_file == NULL.
	(Object::unlock): Likewise.
	(Object::is_locked): Likewise.
	(Object::token): Likewise.
	(Object::release): Likewise.
	(Object::is_incremental): New function.
	(Object::get_mtime): New function.
	(Object::for_all_local_got_entries): New function.
	(Object::clear_view_cache_marks): Allow case where input_file == NULL.
	(Object::set_is_in_system_directory): New function.
	(Object::is_in_system_directory): New function.
	(Object::do_is_incremental): New function.
	(Object::do_get_mtime): New function.
	(Object::do_for_all_local_got_entries): New function.
	(Object::is_in_system_directory_): New data member.
	(Relobj::finalize_incremental_relocs): Add clear_counts parameter.
	(class Sized_relobj_base): New class.
	(class Sized_relobj): Derive from Sized_relobj_base.
	(class Sized_relobj::Symbols): Redeclare from base class.
	(class Sized_relobj::local_got_offset_list): Remove.
	(class Sized_relobj::Output_sections): Redeclare from base class.
	(class Sized_relobj::do_for_all_local_got_entries): New function.
	(class Sized_relobj::write_local_symbols): Add offset parameter.
	(class Sized_relobj::local_symbol_offset_): Update comment.
	(class Sized_relobj::local_dynsym_offset_): Update comment.
	* options.cc (Input_arguments::add_file): Remove const.
	* options.h (Input_file_argument::Input_file_argument):
	Initialize arg_serial_ (all constructors).
	(Input_file_argument::set_arg_serial): New function.
	(Input_file_argument::arg_serial): New function.
	(Input_file_argument::arg_serial_): New data member.
	(Input_arguments::Input_arguments): Initialize file_count_.
	(Input_arguments::add_file): Remove const.
	(Input_arguments::number_of_input_files): New function.
	(Input_arguments::file_count_): New data member.
	(Command_line::number_of_input_files): Call
	Input_arguments::number_of_input_files.
	* output.cc (Output_segment_headers::Output_segment_headers):
	Set current size.
	(Output_section::Input_section::current_data_size): New function.
	(Output_section::Output_section): Initialize new data members.
	(Output_section::add_input_section): Don't do merge sections for
	an incremental link; allocate space from free list for an
	incremental update.
	(Output_section::add_output_section_data): Allocate space from
	free list for an incremental update.
	(Output_section::update_data_size): New function.
	(Output_section::set_fixed_layout): New function.
	(Output_section::reserve): New function.
	(Output_segment::set_section_addresses): Remove const.
	(Output_segment::set_section_list_addresses): Remove const; allocate
	space from free list for an incremental update.
	(Output_segment::set_offset): Adjust size of RELRO segment for an
	incremental update.
	* output.h (Output_data::current_data_size): Move here from
	child classes.
	(Output_data::pre_finalize_data_size): New function.
	(Output_data::update_data_size): New function.
	(Output_section_headers::update_data_size): new function.
	(Output_section_data_build::current_data_size): Move to Output_data.
	(Output_data_strtab::update_data_size): New function.
	(Output_section::current_data_size): Move to Output_data.
	(Output_section::set_fixed_layout): New function.
	(Output_section::has_fixed_layout): New function.
	(Output_section::reserve): New function.
	(Output_section::update_data_size): New function.
	(Output_section::has_fixed_layout_): New data member.
	(Output_section::free_list_): New data member.
	(Output_segment::set_section_addresses): Remove const.
	(Output_segment::set_section_list_addresses): Remove const.
	* plugin.cc (Sized_pluginobj::do_for_all_local_got_entries):
	New function.
	* plugin.h (Sized_pluginobj::do_for_all_local_got_entries):
	New function.
	* readsyms.cc (Read_symbols::do_read_symbols): Add library
	parameter when calling Add_symbols constructor; store argument
	serial number for members of a lib group.
	(Add_symbols::locks): Allow case where token == NULL.
	(Add_symbols::run): Report libraries denoted by --start-lib/--end-lib.
	(Read_member::~Read_member): New function.
	(Read_member::is_runnable): New function.
	(Read_member::locks): New function.
	(Read_member::run): New function.
	(Check_script::~Check_script): New function.
	(Check_script::is_runnable): New function.
	(Check_script::locks): New function.
	(Check_script::run): New function.
	(Check_library::~Check_library): New function.
	(Check_library::is_runnable): New function.
	(Check_library::locks): New function.
	(Check_library::run): New function.
	* readsyms.h (Add_symbols::Add_symbols): Add library parameter.
	(Add_symbols::library_): New data member.
	(class Read_member): New class.
	(class Check_script): New class.
	(class Check_library): New class.
	* reloc.cc (Read_relocs::is_runnable): Allow case where
	token == NULL.
	(Read_relocs::locks): Likewise.
	(Scan_relocs::locks): Likewise.
	(Relocate_task::locks): Likewise.
	(Sized_relobj::do_scan_relocs): Tell finalize_incremental_relocs
	to clear counters.
	(Sized_relobj::incremental_relocs_scan): Fix comment.
	(Sized_relobj::do_relocate): Pass output file offset to
	write_local_symbols.
	(Sized_relobj::incremental_relocs_write_reltype): Use reloc_size
	from class declaration.
	* script.cc (read_input_script): Allocate Script_info; pass
	argument serial number to report_script.
	* script.h (class Script_info): Move to incremental.h.
	* symtab.cc (Symbol_table::add_from_incrobj): New function.
	* symtab.h (Symbol_table::add_from_incrobj): New function.
	(Symbol_table::set_file_offset): New function.
2011-04-12 00:44:48 +00:00

587 lines
18 KiB
C++

// script.h -- handle linker scripts for gold -*- C++ -*-
// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@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.
// We implement a subset of the original GNU ld linker script language
// for compatibility. The goal is not to implement the entire
// language. It is merely to implement enough to handle common uses.
// In particular we need to handle /usr/lib/libc.so on a typical
// GNU/Linux system, and we want to handle linker scripts used by the
// Linux kernel build.
#ifndef GOLD_SCRIPT_H
#define GOLD_SCRIPT_H
#include <cstdio>
#include <string>
#include <vector>
#include "script-sections.h"
namespace gold
{
class General_options;
class Command_line;
class Symbol_table;
class Layout;
class Mapfile;
class Input_argument;
class Input_arguments;
class Input_objects;
class Input_group;
class Input_file;
class Output_segment;
class Task_token;
class Workqueue;
struct Version_dependency_list;
struct Version_expression_list;
struct Version_tree;
struct Version_expression;
class Lazy_demangler;
class Incremental_script_entry;
// This class represents an expression in a linker script.
class Expression
{
protected:
// These should only be created by child classes.
Expression()
{ }
public:
virtual ~Expression()
{ }
// Return the value of the expression which is not permitted to
// refer to the dot symbol. CHECK_ASSERTIONS is true if we should
// check whether assertions are true.
uint64_t
eval(const Symbol_table*, const Layout*, bool check_assertions);
// Return the value of an expression which is permitted to refer to
// the dot symbol. DOT_VALUE is the absolute value of the dot
// symbol. DOT_SECTION is the section in which dot is defined; it
// should be NULL if the dot symbol has an absolute value (e.g., is
// defined in a SECTIONS clause outside of any output section
// definition). This sets *RESULT_SECTION to indicate where the
// value is defined. If the value is absolute *RESULT_SECTION will
// be NULL. Note that the returned value is still an absolute
// value; to get a section relative value the caller must subtract
// the section address. If RESULT_ALIGNMENT is not NULL, this sets
// *RESULT_ALIGNMENT to the alignment of the value of that alignment
// is larger than *RESULT_ALIGNMENT; this will only be non-zero if
// this is an ALIGN expression.
uint64_t
eval_with_dot(const Symbol_table*, const Layout*, bool check_assertions,
uint64_t dot_value, Output_section* dot_section,
Output_section** result_section, uint64_t* result_alignment);
// Return the value of an expression which may or may not be
// permitted to refer to the dot symbol, depending on
// is_dot_available.
uint64_t
eval_maybe_dot(const Symbol_table*, const Layout*, bool check_assertions,
bool is_dot_available, uint64_t dot_value,
Output_section* dot_section,
Output_section** result_section, uint64_t* result_alignment);
// Print the expression to the FILE. This is for debugging.
virtual void
print(FILE*) const = 0;
protected:
struct Expression_eval_info;
public:
// Compute the value of the expression (implemented by child class).
// This is public rather than protected because it is called
// directly by children of Expression on other Expression objects.
virtual uint64_t
value(const Expression_eval_info*) = 0;
private:
// May not be copied.
Expression(const Expression&);
Expression& operator=(const Expression&);
};
// Version_script_info stores information parsed from the version
// script, either provided by --version-script or as part of a linker
// script. A single Version_script_info object per target is owned by
// Script_options.
class Version_script_info
{
public:
// The languages which can be specified in a versionn script.
enum Language
{
LANGUAGE_C, // No demangling.
LANGUAGE_CXX, // C++ demangling.
LANGUAGE_JAVA, // Java demangling.
LANGUAGE_COUNT
};
Version_script_info();
~Version_script_info();
// Clear everything.
void
clear();
// Finalize the version control information.
void
finalize();
// Return whether the information is finalized.
bool
is_finalized() const
{ return this->is_finalized_; }
// Return whether any version were defined in the version script.
bool
empty() const
{ return this->version_trees_.empty(); }
// If there is a version associated with SYMBOL, return true, and
// set *VERSION to the version, and *IS_GLOBAL to whether the symbol
// should be global. Otherwise, return false.
bool
get_symbol_version(const char* symbol, std::string* version,
bool* is_global) const;
// Return whether this symbol matches the local: section of some
// version.
bool
symbol_is_local(const char* symbol) const
{
bool is_global;
return (this->get_symbol_version(symbol, NULL, &is_global)
&& !is_global);
}
// Return the names of versions defined in the version script.
std::vector<std::string>
get_versions() const;
// Return the list of dependencies for this version.
std::vector<std::string>
get_dependencies(const char* version) const;
// The following functions should only be used by the bison helper
// functions. They allocate new structs whose memory belongs to
// Version_script_info. The bison functions copy the information
// from the version script into these structs.
struct Version_dependency_list*
allocate_dependency_list();
struct Version_expression_list*
allocate_expression_list();
struct Version_tree*
allocate_version_tree();
// Build the lookup tables after all data have been read.
void
build_lookup_tables();
// Give an error if there are any unmatched names in the version
// script.
void
check_unmatched_names(const Symbol_table*) const;
// Print contents to the FILE. This is for debugging.
void
print(FILE*) const;
private:
void
print_expression_list(FILE* f, const Version_expression_list*) const;
bool
get_symbol_version_helper(const char* symbol,
bool check_global,
std::string* pversion) const;
// Fast lookup information for a given language.
// We map from exact match strings to Version_tree's. Historically
// version scripts sometimes have the same symbol multiple times,
// which is ambiguous. We warn about that case by storing the
// second Version_tree we see.
struct Version_tree_match
{
Version_tree_match(const Version_tree* r, bool ig,
const Version_expression* e)
: real(r), is_global(ig), expression(e), ambiguous(NULL)
{ }
// The Version_tree that we return.
const Version_tree* real;
// True if this is a global match for the REAL member, false if it
// is a local match.
bool is_global;
// Point back to the Version_expression for which we created this
// match.
const Version_expression* expression;
// If not NULL, another Version_tree that defines the symbol.
const Version_tree* ambiguous;
};
// Map from an exact match string to a Version_tree.
typedef Unordered_map<std::string, Version_tree_match> Exact;
// Fast lookup information for a glob pattern.
struct Glob
{
Glob()
: expression(NULL), version(NULL), is_global(false)
{ }
Glob(const Version_expression* e, const Version_tree* v, bool ig)
: expression(e), version(v), is_global(ig)
{ }
// A pointer to the version expression holding the pattern to
// match and the language to use for demangling the symbol before
// doing the match.
const Version_expression* expression;
// The Version_tree we use if this pattern matches.
const Version_tree* version;
// True if this is a global symbol.
bool is_global;
};
typedef std::vector<Glob> Globs;
bool
unquote(std::string*) const;
void
add_exact_match(const std::string&, const Version_tree*, bool is_global,
const Version_expression*, Exact*);
void
build_expression_list_lookup(const Version_expression_list*,
const Version_tree*, bool);
const char*
get_name_to_match(const char*, int,
Lazy_demangler*, Lazy_demangler*) const;
// All the version dependencies we allocate.
std::vector<Version_dependency_list*> dependency_lists_;
// All the version expressions we allocate.
std::vector<Version_expression_list*> expression_lists_;
// The list of versions.
std::vector<Version_tree*> version_trees_;
// Exact matches for global symbols, by language.
Exact* exact_[LANGUAGE_COUNT];
// A vector of glob patterns mapping to Version_trees.
Globs globs_;
// The default version to use, if there is one. This is from a
// pattern of "*".
const Version_tree* default_version_;
// True if the default version is global.
bool default_is_global_;
// Whether this has been finalized.
bool is_finalized_;
};
// This class manages assignments to symbols. These can appear in
// three different locations in scripts: outside of a SECTIONS clause,
// within a SECTIONS clause, and within an output section definition
// within a SECTIONS clause. This can also appear on the command line
// via the --defsym command line option.
class Symbol_assignment
{
public:
Symbol_assignment(const char* name, size_t namelen, bool is_defsym,
Expression* val, bool provide, bool hidden)
: name_(name, namelen), val_(val), is_defsym_(is_defsym),
provide_(provide), hidden_(hidden), sym_(NULL)
{ }
// Add the symbol to the symbol table.
void
add_to_table(Symbol_table*);
// Finalize the symbol value.
void
finalize(Symbol_table*, const Layout*);
// Finalize the symbol value when it can refer to the dot symbol.
void
finalize_with_dot(Symbol_table*, const Layout*, uint64_t dot_value,
Output_section* dot_section);
// Set the symbol value, but only if the value is absolute. This is
// used while processing a SECTIONS clause. We assume that dot is
// an absolute value here. We do not check assertions.
void
set_if_absolute(Symbol_table*, const Layout*, bool is_dot_available,
uint64_t dot_value);
const std::string&
name() const
{ return this->name_; }
// Print the assignment to the FILE. This is for debugging.
void
print(FILE*) const;
private:
// Shared by finalize and finalize_with_dot.
void
finalize_maybe_dot(Symbol_table*, const Layout*, bool is_dot_available,
uint64_t dot_value, Output_section* dot_section);
// Sized version of finalize.
template<int size>
void
sized_finalize(Symbol_table*, const Layout*, bool is_dot_available,
uint64_t dot_value, Output_section*);
// Symbol name.
std::string name_;
// Expression to assign to symbol.
Expression* val_;
// True if this symbol is defined by a --defsym, false if it is
// defined in a linker script.
bool is_defsym_;
// Whether the assignment should be provided (only set if there is
// an undefined reference to the symbol.
bool provide_;
// Whether the assignment should be hidden.
bool hidden_;
// The entry in the symbol table.
Symbol* sym_;
};
// This class manages assertions in linker scripts. These can appear
// in all the places where a Symbol_assignment can appear.
class Script_assertion
{
public:
Script_assertion(Expression* check, const char* message,
size_t messagelen)
: check_(check), message_(message, messagelen)
{ }
// Check the assertion.
void
check(const Symbol_table*, const Layout*);
// Print the assertion to the FILE. This is for debugging.
void
print(FILE*) const;
private:
// The expression to check.
Expression* check_;
// The message to issue if the expression fails.
std::string message_;
};
// We can read a linker script in two different contexts: when
// initially parsing the command line, and when we find an input file
// which is actually a linker script. Also some of the data which can
// be set by a linker script can also be set via command line options
// like -e and --defsym. This means that we have a type of data which
// can be set both during command line option parsing and while
// reading input files. We store that data in an instance of this
// object. We will keep pointers to that instance in both the
// Command_line and Layout objects.
class Script_options
{
public:
Script_options();
// Add a symbol to be defined.
void
add_symbol_assignment(const char* name, size_t length, bool is_defsym,
Expression* value, bool provide, bool hidden);
// Look for an assigned symbol.
bool
is_pending_assignment(const char* name);
// Add a reference to a symbol.
void
add_symbol_reference(const char* name, size_t length);
// Add an assertion.
void
add_assertion(Expression* check, const char* message, size_t messagelen);
// Define a symbol from the command line.
bool
define_symbol(const char* definition);
// Create sections required by any linker scripts.
void
create_script_sections(Layout*);
// Add all symbol definitions to the symbol table.
void
add_symbols_to_table(Symbol_table*);
// Used to iterate over symbols which are referenced in expressions
// but not defined.
typedef Unordered_set<std::string>::const_iterator referenced_const_iterator;
referenced_const_iterator
referenced_begin() const
{ return this->symbol_references_.begin(); }
referenced_const_iterator
referenced_end() const
{ return this->symbol_references_.end(); }
// Return whether a symbol is referenced but not defined.
bool
is_referenced(const std::string& name) const
{
return (this->symbol_references_.find(name)
!= this->symbol_references_.end());
}
// Return whether there are any symbols which were referenced but
// not defined.
bool
any_unreferenced() const
{ return !this->symbol_references_.empty(); }
// Finalize the symbol values. Also check assertions.
void
finalize_symbols(Symbol_table*, const Layout*);
// Version information parsed from a version script. Everything
// else has a pointer to this object.
Version_script_info*
version_script_info()
{ return &this->version_script_info_; }
const Version_script_info*
version_script_info() const
{ return &this->version_script_info_; }
// A SECTIONS clause parsed from a linker script. Everything else
// has a pointer to this object.
Script_sections*
script_sections()
{ return &this->script_sections_; }
const Script_sections*
script_sections() const
{ return &this->script_sections_; }
// Whether we saw a SECTIONS clause.
bool
saw_sections_clause() const
{ return this->script_sections_.saw_sections_clause(); }
// Whether we saw a PHDRS clause.
bool
saw_phdrs_clause() const
{ return this->script_sections_.saw_phdrs_clause(); }
// Set section addresses using a SECTIONS clause. Return the
// segment which should hold the file header and segment headers;
// this may return NULL, in which case the headers are not in a
// loadable segment.
Output_segment*
set_section_addresses(Symbol_table*, Layout*);
// Print the script to the FILE. This is for debugging.
void
print(FILE*) const;
private:
// We keep a list of symbol assignments which occur outside of a
// SECTIONS clause.
typedef std::vector<Symbol_assignment*> Symbol_assignments;
// We keep a list of all assertions whcih occur outside of a
// SECTIONS clause.
typedef std::vector<Script_assertion*> Assertions;
// The entry address. This will be empty if not set.
std::string entry_;
// Symbols to set.
Symbol_assignments symbol_assignments_;
// Symbols defined in an expression, for faster lookup.
Unordered_set<std::string> symbol_definitions_;
// Symbols referenced in an expression.
Unordered_set<std::string> symbol_references_;
// Assertions to check.
Assertions assertions_;
// Version information parsed from a version script.
Version_script_info version_script_info_;
// Information from any SECTIONS clauses.
Script_sections script_sections_;
};
// FILE was found as an argument on the command line, but was not
// recognized as an ELF file. Try to read it as a script. Return
// true if the file was handled. This has to handle /usr/lib/libc.so
// on a GNU/Linux system. *USED_NEXT_BLOCKER is set to indicate
// whether the function took over NEXT_BLOCKER.
bool
read_input_script(Workqueue*, Symbol_table*, Layout*, Dirsearch*, int,
Input_objects*, Mapfile*, Input_group*,
const Input_argument*, Input_file*,
Task_token* next_blocker, bool* used_next_blocker);
// FILE was found as an argument to --script (-T).
// Read it as a script, and execute its contents immediately.
bool
read_commandline_script(const char* filename, Command_line* cmdline);
// FILE was found as an argument to --version-script. Read it as a
// version script, and store its contents in
// cmdline->script_options()->version_script_info().
bool
read_version_script(const char* filename, Command_line* cmdline);
// FILENAME was found as an argument to --dynamic-list. Read it as a
// version script (actually, a versym_node from a version script), and
// store its contents in DYNAMIC_LIST.
bool
read_dynamic_list(const char* filename, Command_line* cmdline,
Script_options* dynamic_list);
} // End namespace gold.
#endif // !defined(GOLD_SCRIPT_H)