cdc29364d1
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.
608 lines
17 KiB
C++
608 lines
17 KiB
C++
// fileread.h -- read files for gold -*- C++ -*-
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// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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// MA 02110-1301, USA.
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// Classes used to read data from binary input files.
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#ifndef GOLD_FILEREAD_H
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#define GOLD_FILEREAD_H
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#include <list>
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#include <map>
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#include <string>
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#include <vector>
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#include "token.h"
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namespace gold
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{
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// Since not all system supports stat.st_mtim and struct timespec,
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// we define our own structure and fill the nanoseconds if we can.
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struct Timespec
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{
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Timespec()
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: seconds(0), nanoseconds(0)
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{ }
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Timespec(time_t a_seconds, int a_nanoseconds)
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: seconds(a_seconds), nanoseconds(a_nanoseconds)
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{ }
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time_t seconds;
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int nanoseconds;
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};
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// Get the last modified time of an unopened file. Returns false if the
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// file does not exist.
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bool
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get_mtime(const char* filename, Timespec* mtime);
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class Position_dependent_options;
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class Input_file_argument;
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class Dirsearch;
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class File_view;
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// File_read manages a file descriptor and mappings for a file we are
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// reading.
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class File_read
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{
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public:
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File_read()
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: name_(), descriptor_(-1), is_descriptor_opened_(false), object_count_(0),
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size_(0), token_(false), views_(), saved_views_(), mapped_bytes_(0),
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released_(true), whole_file_view_(NULL)
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{ }
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~File_read();
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// Open a file.
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bool
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open(const Task*, const std::string& name);
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// Pretend to open the file, but provide the file contents. No
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// actual file system activity will occur. This is used for
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// testing.
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bool
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open(const Task*, const std::string& name, const unsigned char* contents,
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off_t size);
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// Return the file name.
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const std::string&
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filename() const
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{ return this->name_; }
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// Add an object associated with a file.
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void
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add_object()
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{ ++this->object_count_; }
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// Remove an object associated with a file.
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void
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remove_object()
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{ --this->object_count_; }
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// Lock the file for exclusive access within a particular Task::run
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// execution. This routine may only be called when the workqueue
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// lock is held.
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void
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lock(const Task* t);
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// Unlock the file.
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void
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unlock(const Task* t);
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// Test whether the object is locked.
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bool
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is_locked() const;
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// Return the token, so that the task can be queued.
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Task_token*
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token()
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{ return &this->token_; }
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// Release the file. This indicates that we aren't going to do
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// anything further with it until it is unlocked. This is used
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// because a Task which locks the file never calls either lock or
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// unlock; it just locks the token. The basic rule is that a Task
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// which locks a file via the Task::locks interface must explicitly
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// call release() when it is done. This is not necessary for code
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// which calls unlock() on the file.
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void
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release();
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// Return the size of the file.
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off_t
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filesize() const
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{ return this->size_; }
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// Return a view into the file starting at file offset START for
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// SIZE bytes. OFFSET is the offset into the input file for the
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// file we are reading; this is zero for a normal object file,
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// non-zero for an object file in an archive. ALIGNED is true if
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// the data must be naturally aligned; this only matters when OFFSET
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// is not zero. The pointer will remain valid until the File_read
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// is unlocked. It is an error if we can not read enough data from
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// the file. The CACHE parameter is a hint as to whether it will be
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// useful to cache this data for later accesses--i.e., later calls
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// to get_view, read, or get_lasting_view which retrieve the same
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// data.
|
|
const unsigned char*
|
|
get_view(off_t offset, off_t start, section_size_type size, bool aligned,
|
|
bool cache);
|
|
|
|
// Read data from the file into the buffer P starting at file offset
|
|
// START for SIZE bytes.
|
|
void
|
|
read(off_t start, section_size_type size, void* p);
|
|
|
|
// Return a lasting view into the file starting at file offset START
|
|
// for SIZE bytes. This is allocated with new, and the caller is
|
|
// responsible for deleting it when done. The data associated with
|
|
// this view will remain valid until the view is deleted. It is an
|
|
// error if we can not read enough data from the file. The OFFSET,
|
|
// ALIGNED and CACHE parameters are as in get_view.
|
|
File_view*
|
|
get_lasting_view(off_t offset, off_t start, section_size_type size,
|
|
bool aligned, bool cache);
|
|
|
|
// Mark all views as no longer cached.
|
|
void
|
|
clear_view_cache_marks();
|
|
|
|
// Discard all uncached views. This is normally done by release(),
|
|
// but not for objects in archives. FIXME: This is a complicated
|
|
// interface, and it would be nice to have something more automatic.
|
|
void
|
|
clear_uncached_views()
|
|
{ this->clear_views(CLEAR_VIEWS_ARCHIVE); }
|
|
|
|
// A struct used to do a multiple read.
|
|
struct Read_multiple_entry
|
|
{
|
|
// The file offset of the data to read.
|
|
off_t file_offset;
|
|
// The amount of data to read.
|
|
section_size_type size;
|
|
// The buffer where the data should be placed.
|
|
unsigned char* buffer;
|
|
|
|
Read_multiple_entry(off_t o, section_size_type s, unsigned char* b)
|
|
: file_offset(o), size(s), buffer(b)
|
|
{ }
|
|
};
|
|
|
|
typedef std::vector<Read_multiple_entry> Read_multiple;
|
|
|
|
// Read a bunch of data from the file into various different
|
|
// locations. The vector must be sorted by ascending file_offset.
|
|
// BASE is a base offset to be added to all the offsets in the
|
|
// vector.
|
|
void
|
|
read_multiple(off_t base, const Read_multiple&);
|
|
|
|
// Dump statistical information to stderr.
|
|
static void
|
|
print_stats();
|
|
|
|
// Return the open file descriptor (for plugins).
|
|
int
|
|
descriptor()
|
|
{
|
|
this->reopen_descriptor();
|
|
return this->descriptor_;
|
|
}
|
|
|
|
// Return the file last modification time. Calls gold_fatal if the stat
|
|
// system call failed.
|
|
Timespec
|
|
get_mtime();
|
|
|
|
private:
|
|
// Control for what views to clear.
|
|
enum Clear_views_mode
|
|
{
|
|
// Clear uncached views not used by an archive.
|
|
CLEAR_VIEWS_NORMAL,
|
|
// Clear all uncached views (including in an archive).
|
|
CLEAR_VIEWS_ARCHIVE,
|
|
// Clear all views (i.e., we're destroying the file).
|
|
CLEAR_VIEWS_ALL
|
|
};
|
|
|
|
// This class may not be copied.
|
|
File_read(const File_read&);
|
|
File_read& operator=(const File_read&);
|
|
|
|
// Total bytes mapped into memory during the link if --stats.
|
|
static unsigned long long total_mapped_bytes;
|
|
|
|
// Current number of bytes mapped into memory during the link if
|
|
// --stats.
|
|
static unsigned long long current_mapped_bytes;
|
|
|
|
// High water mark of bytes mapped into memory during the link if
|
|
// --stats.
|
|
static unsigned long long maximum_mapped_bytes;
|
|
|
|
// A view into the file.
|
|
class View
|
|
{
|
|
public:
|
|
// Specifies how to dispose the data on destruction of the view.
|
|
enum Data_ownership
|
|
{
|
|
// Data owned by File object - nothing done in destructor.
|
|
DATA_NOT_OWNED,
|
|
// Data allocated with new[] and owned by this object - should
|
|
// use delete[].
|
|
DATA_ALLOCATED_ARRAY,
|
|
// Data mmapped and owned by this object - should munmap.
|
|
DATA_MMAPPED
|
|
};
|
|
|
|
View(off_t start, section_size_type size, const unsigned char* data,
|
|
unsigned int byteshift, bool cache, Data_ownership data_ownership)
|
|
: start_(start), size_(size), data_(data), lock_count_(0),
|
|
byteshift_(byteshift), cache_(cache), data_ownership_(data_ownership),
|
|
accessed_(true)
|
|
{ }
|
|
|
|
~View();
|
|
|
|
off_t
|
|
start() const
|
|
{ return this->start_; }
|
|
|
|
section_size_type
|
|
size() const
|
|
{ return this->size_; }
|
|
|
|
const unsigned char*
|
|
data() const
|
|
{ return this->data_; }
|
|
|
|
void
|
|
lock();
|
|
|
|
void
|
|
unlock();
|
|
|
|
bool
|
|
is_locked();
|
|
|
|
unsigned int
|
|
byteshift() const
|
|
{ return this->byteshift_; }
|
|
|
|
void
|
|
set_cache()
|
|
{ this->cache_ = true; }
|
|
|
|
void
|
|
clear_cache()
|
|
{ this->cache_ = false; }
|
|
|
|
bool
|
|
should_cache() const
|
|
{ return this->cache_; }
|
|
|
|
void
|
|
set_accessed()
|
|
{ this->accessed_ = true; }
|
|
|
|
void
|
|
clear_accessed()
|
|
{ this->accessed_= false; }
|
|
|
|
bool
|
|
accessed() const
|
|
{ return this->accessed_; }
|
|
|
|
// Returns TRUE if this view contains permanent data -- e.g., data that
|
|
// was supplied by the owner of the File object.
|
|
bool
|
|
is_permanent_view() const
|
|
{ return this->data_ownership_ == DATA_NOT_OWNED; }
|
|
|
|
private:
|
|
View(const View&);
|
|
View& operator=(const View&);
|
|
|
|
// The file offset of the start of the view.
|
|
off_t start_;
|
|
// The size of the view.
|
|
section_size_type size_;
|
|
// A pointer to the actual bytes.
|
|
const unsigned char* data_;
|
|
// The number of locks on this view.
|
|
int lock_count_;
|
|
// The number of bytes that the view is shifted relative to the
|
|
// underlying file. This is used to align data. This is normally
|
|
// zero, except possibly for an object in an archive.
|
|
unsigned int byteshift_;
|
|
// Whether the view is cached.
|
|
bool cache_;
|
|
// Whether the view is mapped into memory. If not, data_ points
|
|
// to memory allocated using new[].
|
|
Data_ownership data_ownership_;
|
|
// Whether the view has been accessed recently.
|
|
bool accessed_;
|
|
};
|
|
|
|
friend class View;
|
|
friend class File_view;
|
|
|
|
// The type of a mapping from page start and byte shift to views.
|
|
typedef std::map<std::pair<off_t, unsigned int>, View*> Views;
|
|
|
|
// A simple list of Views.
|
|
typedef std::list<View*> Saved_views;
|
|
|
|
// Open the descriptor if necessary.
|
|
void
|
|
reopen_descriptor();
|
|
|
|
// Find a view into the file.
|
|
View*
|
|
find_view(off_t start, section_size_type size, unsigned int byteshift,
|
|
View** vshifted) const;
|
|
|
|
// Read data from the file into a buffer.
|
|
void
|
|
do_read(off_t start, section_size_type size, void* p);
|
|
|
|
// Add a view.
|
|
void
|
|
add_view(View*);
|
|
|
|
// Make a view into the file.
|
|
View*
|
|
make_view(off_t start, section_size_type size, unsigned int byteshift,
|
|
bool cache);
|
|
|
|
// Find or make a view into the file.
|
|
View*
|
|
find_or_make_view(off_t offset, off_t start, section_size_type size,
|
|
bool aligned, bool cache);
|
|
|
|
// Clear the file views.
|
|
void
|
|
clear_views(Clear_views_mode);
|
|
|
|
// The size of a file page for buffering data.
|
|
static const off_t page_size = 8192;
|
|
|
|
// Given a file offset, return the page offset.
|
|
static off_t
|
|
page_offset(off_t file_offset)
|
|
{ return file_offset & ~ (page_size - 1); }
|
|
|
|
// Given a file size, return the size to read integral pages.
|
|
static off_t
|
|
pages(off_t file_size)
|
|
{ return (file_size + (page_size - 1)) & ~ (page_size - 1); }
|
|
|
|
// The maximum number of entries we will pass to ::readv.
|
|
static const size_t max_readv_entries = 128;
|
|
|
|
// Use readv to read data.
|
|
void
|
|
do_readv(off_t base, const Read_multiple&, size_t start, size_t count);
|
|
|
|
// File name.
|
|
std::string name_;
|
|
// File descriptor.
|
|
int descriptor_;
|
|
// Whether we have regained the descriptor after releasing the file.
|
|
bool is_descriptor_opened_;
|
|
// The number of objects associated with this file. This will be
|
|
// more than 1 in the case of an archive.
|
|
int object_count_;
|
|
// File size.
|
|
off_t size_;
|
|
// A token used to lock the file.
|
|
Task_token token_;
|
|
// Buffered views into the file.
|
|
Views views_;
|
|
// List of views which were locked but had to be removed from views_
|
|
// because they were not large enough.
|
|
Saved_views saved_views_;
|
|
// Total amount of space mapped into memory. This is only changed
|
|
// while the file is locked. When we unlock the file, we transfer
|
|
// the total to total_mapped_bytes, and reset this to zero.
|
|
size_t mapped_bytes_;
|
|
// Whether the file was released.
|
|
bool released_;
|
|
// A view containing the whole file. May be NULL if we mmap only
|
|
// the relevant parts of the file. Not NULL if:
|
|
// - Flag --mmap_whole_files is set (default on 64-bit hosts).
|
|
// - The contents was specified in the constructor. Used only for
|
|
// testing purposes).
|
|
View* whole_file_view_;
|
|
};
|
|
|
|
// A view of file data that persists even when the file is unlocked.
|
|
// Callers should destroy these when no longer required. These are
|
|
// obtained form File_read::get_lasting_view. They may only be
|
|
// destroyed when the underlying File_read is locked.
|
|
|
|
class File_view
|
|
{
|
|
public:
|
|
// This may only be called when the underlying File_read is locked.
|
|
~File_view();
|
|
|
|
// Return a pointer to the data associated with this view.
|
|
const unsigned char*
|
|
data() const
|
|
{ return this->data_; }
|
|
|
|
private:
|
|
File_view(const File_view&);
|
|
File_view& operator=(const File_view&);
|
|
|
|
friend class File_read;
|
|
|
|
// Callers have to get these via File_read::get_lasting_view.
|
|
File_view(File_read& file, File_read::View* view, const unsigned char* data)
|
|
: file_(file), view_(view), data_(data)
|
|
{ }
|
|
|
|
File_read& file_;
|
|
File_read::View* view_;
|
|
const unsigned char* data_;
|
|
};
|
|
|
|
// All the information we hold for a single input file. This can be
|
|
// an object file, a shared library, or an archive.
|
|
|
|
class Input_file
|
|
{
|
|
public:
|
|
enum Format
|
|
{
|
|
FORMAT_NONE,
|
|
FORMAT_ELF,
|
|
FORMAT_BINARY
|
|
};
|
|
|
|
Input_file(const Input_file_argument* input_argument)
|
|
: input_argument_(input_argument), found_name_(), file_(),
|
|
is_in_sysroot_(false), format_(FORMAT_NONE)
|
|
{ }
|
|
|
|
// Create an input file with the contents already provided. This is
|
|
// only used for testing. With this path, don't call the open
|
|
// method.
|
|
Input_file(const Task*, const char* name, const unsigned char* contents,
|
|
off_t size);
|
|
|
|
// Return the command line argument.
|
|
const Input_file_argument*
|
|
input_file_argument() const
|
|
{ return this->input_argument_; }
|
|
|
|
// Return whether this is a file that we will search for in the list
|
|
// of directories.
|
|
bool
|
|
will_search_for() const;
|
|
|
|
// Open the file. If the open fails, this will report an error and
|
|
// return false. If there is a search, it starts at directory
|
|
// *PINDEX. *PINDEX should be initialized to zero. It may be
|
|
// restarted to find the next file with a matching name by
|
|
// incrementing the result and calling this again.
|
|
bool
|
|
open(const Dirsearch&, const Task*, int* pindex);
|
|
|
|
// Return the name given by the user. For -lc this will return "c".
|
|
const char*
|
|
name() const;
|
|
|
|
// Return the file name. For -lc this will return something like
|
|
// "/usr/lib/libc.so".
|
|
const std::string&
|
|
filename() const
|
|
{ return this->file_.filename(); }
|
|
|
|
// Return the name under which we found the file, corresponding to
|
|
// the command line. For -lc this will return something like
|
|
// "libc.so".
|
|
const std::string&
|
|
found_name() const
|
|
{ return this->found_name_; }
|
|
|
|
// Return the position dependent options.
|
|
const Position_dependent_options&
|
|
options() const;
|
|
|
|
// Return the file.
|
|
File_read&
|
|
file()
|
|
{ return this->file_; }
|
|
|
|
const File_read&
|
|
file() const
|
|
{ return this->file_; }
|
|
|
|
// Whether we found the file in a directory in the system root.
|
|
bool
|
|
is_in_sysroot() const
|
|
{ return this->is_in_sysroot_; }
|
|
|
|
// Whether this file is in a system directory.
|
|
bool
|
|
is_in_system_directory() const;
|
|
|
|
// Return whether this file is to be read only for its symbols.
|
|
bool
|
|
just_symbols() const;
|
|
|
|
// Return the format of the unconverted input file.
|
|
Format
|
|
format() const
|
|
{ return this->format_; }
|
|
|
|
// Try to find a file in the extra search dirs. Returns true on success.
|
|
static bool
|
|
try_extra_search_path(int* pindex,
|
|
const Input_file_argument* input_argument,
|
|
std::string filename, std::string* found_name,
|
|
std::string* namep);
|
|
|
|
// Find the actual file.
|
|
static bool
|
|
find_file(const Dirsearch& dirpath, int* pindex,
|
|
const Input_file_argument* input_argument,
|
|
bool* is_in_sysroot,
|
|
std::string* found_name, std::string* namep);
|
|
|
|
private:
|
|
Input_file(const Input_file&);
|
|
Input_file& operator=(const Input_file&);
|
|
|
|
// Open a binary file.
|
|
bool
|
|
open_binary(const Task* task, const std::string& name);
|
|
|
|
// The argument from the command line.
|
|
const Input_file_argument* input_argument_;
|
|
// The name under which we opened the file. This is like the name
|
|
// on the command line, but -lc turns into libc.so (or whatever).
|
|
// It only includes the full path if the path was on the command
|
|
// line.
|
|
std::string found_name_;
|
|
// The file after we open it.
|
|
File_read file_;
|
|
// Whether we found the file in a directory in the system root.
|
|
bool is_in_sysroot_;
|
|
// Format of unconverted input file.
|
|
Format format_;
|
|
};
|
|
|
|
} // end namespace gold
|
|
|
|
#endif // !defined(GOLD_FILEREAD_H)
|