| // inremental.h -- incremental linking support for gold -*- C++ -*- |
| |
| // Copyright (C) 2009-2024 Free Software Foundation, Inc. |
| // Written by Mikolaj Zalewski <mikolajz@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. |
| |
| #ifndef GOLD_INCREMENTAL_H |
| #define GOLD_INCREMENTAL_H |
| |
| #include <map> |
| #include <vector> |
| |
| #include "elfcpp_file.h" |
| #include "stringpool.h" |
| #include "workqueue.h" |
| #include "fileread.h" |
| #include "output.h" |
| #include "archive.h" |
| |
| namespace gold |
| { |
| |
| class Input_argument; |
| class Incremental_inputs_checker; |
| class Incremental_script_entry; |
| class Incremental_object_entry; |
| class Incremental_dynobj_entry; |
| class Incremental_archive_entry; |
| class Incremental_inputs; |
| class Incremental_binary; |
| class Incremental_library; |
| class Object; |
| |
| // Incremental input type as stored in .gnu_incremental_inputs. |
| |
| enum Incremental_input_type |
| { |
| INCREMENTAL_INPUT_OBJECT = 1, |
| INCREMENTAL_INPUT_ARCHIVE_MEMBER = 2, |
| INCREMENTAL_INPUT_ARCHIVE = 3, |
| INCREMENTAL_INPUT_SHARED_LIBRARY = 4, |
| INCREMENTAL_INPUT_SCRIPT = 5 |
| }; |
| |
| // Incremental input file flags. |
| // The input file type is stored in the lower eight bits. |
| |
| enum Incremental_input_flags |
| { |
| INCREMENTAL_INPUT_IN_SYSTEM_DIR = 0x8000, |
| INCREMENTAL_INPUT_AS_NEEDED = 0x4000 |
| }; |
| |
| // Symbol flags for the incremental symbol table. |
| // These flags are stored in the top two bits of |
| // the symbol index field. |
| |
| enum Incremental_shlib_symbol_flags |
| { |
| // Symbol is defined in this library. |
| INCREMENTAL_SHLIB_SYM_DEF = 2, |
| // Symbol is defined in this library, with a COPY relocation. |
| INCREMENTAL_SHLIB_SYM_COPY = 3 |
| }; |
| |
| static const int INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT = 30; |
| |
| // Return TRUE if a section of type SH_TYPE can be updated in place |
| // during an incremental update. |
| bool |
| can_incremental_update(unsigned int sh_type); |
| |
| // Create an Incremental_binary object for FILE. Returns NULL is this is not |
| // possible, e.g. FILE is not an ELF file or has an unsupported target. |
| |
| Incremental_binary* |
| open_incremental_binary(Output_file* file); |
| |
| // Base class for recording each input file. |
| |
| class Incremental_input_entry |
| { |
| public: |
| Incremental_input_entry(Stringpool::Key filename_key, unsigned int arg_serial, |
| Timespec mtime) |
| : filename_key_(filename_key), file_index_(0), offset_(0), info_offset_(0), |
| arg_serial_(arg_serial), mtime_(mtime), is_in_system_directory_(false), |
| as_needed_(false) |
| { } |
| |
| virtual |
| ~Incremental_input_entry() |
| { } |
| |
| // Return the type of input file. |
| Incremental_input_type |
| type() const |
| { return this->do_type(); } |
| |
| // Set the index and section offset of this input file entry. |
| void |
| set_offset(unsigned int file_index, unsigned int offset) |
| { |
| this->file_index_ = file_index; |
| this->offset_ = offset; |
| } |
| |
| // Set the section offset of the supplemental information for this entry. |
| void |
| set_info_offset(unsigned int info_offset) |
| { this->info_offset_ = info_offset; } |
| |
| // Get the index of this input file entry. |
| unsigned int |
| get_file_index() const |
| { return this->file_index_; } |
| |
| // Get the section offset of this input file entry. |
| unsigned int |
| get_offset() const |
| { return this->offset_; } |
| |
| // Get the section offset of the supplemental information for this entry. |
| unsigned int |
| get_info_offset() const |
| { return this->info_offset_; } |
| |
| // Get the stringpool key for the input filename. |
| Stringpool::Key |
| get_filename_key() const |
| { return this->filename_key_; } |
| |
| // Get the serial number of the input file. |
| unsigned int |
| arg_serial() const |
| { return this->arg_serial_; } |
| |
| // Get the modification time of the input file. |
| const Timespec& |
| get_mtime() const |
| { return this->mtime_; } |
| |
| // Record that the file was found in a system directory. |
| void |
| set_is_in_system_directory() |
| { this->is_in_system_directory_ = true; } |
| |
| // Return TRUE if the file was found in a system directory. |
| bool |
| is_in_system_directory() const |
| { return this->is_in_system_directory_; } |
| |
| // Record that the file was linked with --as-needed. |
| void |
| set_as_needed() |
| { this->as_needed_ = true; } |
| |
| // Return TRUE if the file was linked with --as-needed. |
| bool |
| as_needed() const |
| { return this->as_needed_; } |
| |
| // Return a pointer to the derived Incremental_script_entry object. |
| // Return NULL for input entries that are not script files. |
| Incremental_script_entry* |
| script_entry() |
| { return this->do_script_entry(); } |
| |
| // Return a pointer to the derived Incremental_object_entry object. |
| // Return NULL for input entries that are not object files. |
| Incremental_object_entry* |
| object_entry() |
| { return this->do_object_entry(); } |
| |
| // Return a pointer to the derived Incremental_dynobj_entry object. |
| // Return NULL for input entries that are not shared object files. |
| Incremental_dynobj_entry* |
| dynobj_entry() |
| { return this->do_dynobj_entry(); } |
| |
| // Return a pointer to the derived Incremental_archive_entry object. |
| // Return NULL for input entries that are not archive files. |
| Incremental_archive_entry* |
| archive_entry() |
| { return this->do_archive_entry(); } |
| |
| protected: |
| // Return the type of input file. |
| virtual Incremental_input_type |
| do_type() const = 0; |
| |
| // Return a pointer to the derived Incremental_script_entry object. |
| // Return NULL for input entries that are not script files. |
| virtual Incremental_script_entry* |
| do_script_entry() |
| { return NULL; } |
| |
| // Return a pointer to the derived Incremental_object_entry object. |
| // Return NULL for input entries that are not object files. |
| virtual Incremental_object_entry* |
| do_object_entry() |
| { return NULL; } |
| |
| // Return a pointer to the derived Incremental_dynobj_entry object. |
| // Return NULL for input entries that are not shared object files. |
| virtual Incremental_dynobj_entry* |
| do_dynobj_entry() |
| { return NULL; } |
| |
| // Return a pointer to the derived Incremental_archive_entry object. |
| // Return NULL for input entries that are not archive files. |
| virtual Incremental_archive_entry* |
| do_archive_entry() |
| { return NULL; } |
| |
| private: |
| // Key of the filename string in the section stringtable. |
| Stringpool::Key filename_key_; |
| |
| // Index of the entry in the output section. |
| unsigned int file_index_; |
| |
| // Offset of the entry in the output section. |
| unsigned int offset_; |
| |
| // Offset of the extra information in the output section. |
| unsigned int info_offset_; |
| |
| // Serial number of the file in the argument list. |
| unsigned int arg_serial_; |
| |
| // Last modification time of the file. |
| Timespec mtime_; |
| |
| // TRUE if the file was found in a system directory. |
| bool is_in_system_directory_; |
| |
| // TRUE if the file was linked with --as-needed. |
| bool as_needed_; |
| }; |
| |
| // Information about a script input that will persist during the whole linker |
| // run. Needed only during an incremental build to retrieve the input files |
| // added by this script. |
| |
| class Script_info |
| { |
| public: |
| Script_info(const std::string& filename) |
| : filename_(filename), input_file_index_(0), |
| incremental_script_entry_(NULL) |
| { } |
| |
| Script_info(const std::string& filename, unsigned int input_file_index) |
| : filename_(filename), input_file_index_(input_file_index), |
| incremental_script_entry_(NULL) |
| { } |
| |
| // Store a pointer to the incremental information for this script. |
| void |
| set_incremental_info(Incremental_script_entry* entry) |
| { this->incremental_script_entry_ = entry; } |
| |
| // Return the filename. |
| const std::string& |
| filename() const |
| { return this->filename_; } |
| |
| // Return the input file index. |
| unsigned int |
| input_file_index() const |
| { return this->input_file_index_; } |
| |
| // Return the pointer to the incremental information for this script. |
| Incremental_script_entry* |
| incremental_info() const |
| { return this->incremental_script_entry_; } |
| |
| private: |
| const std::string filename_; |
| unsigned int input_file_index_; |
| Incremental_script_entry* incremental_script_entry_; |
| }; |
| |
| // Class for recording input scripts. |
| |
| class Incremental_script_entry : public Incremental_input_entry |
| { |
| public: |
| Incremental_script_entry(Stringpool::Key filename_key, |
| unsigned int arg_serial, Script_info* /*script*/, |
| Timespec mtime) |
| : Incremental_input_entry(filename_key, arg_serial, mtime), |
| objects_() |
| { } |
| |
| // Add a member object to the archive. |
| void |
| add_object(Incremental_input_entry* obj_entry) |
| { |
| this->objects_.push_back(obj_entry); |
| } |
| |
| // Return the number of objects included by this script. |
| unsigned int |
| get_object_count() |
| { return this->objects_.size(); } |
| |
| // Return the Nth object. |
| Incremental_input_entry* |
| get_object(unsigned int n) |
| { |
| gold_assert(n < this->objects_.size()); |
| return this->objects_[n]; |
| } |
| |
| protected: |
| virtual Incremental_input_type |
| do_type() const |
| { return INCREMENTAL_INPUT_SCRIPT; } |
| |
| // Return a pointer to the derived Incremental_script_entry object. |
| virtual Incremental_script_entry* |
| do_script_entry() |
| { return this; } |
| |
| private: |
| // Objects that have been included by this script. |
| std::vector<Incremental_input_entry*> objects_; |
| }; |
| |
| // Class for recording input object files. |
| |
| class Incremental_object_entry : public Incremental_input_entry |
| { |
| public: |
| Incremental_object_entry(Stringpool::Key filename_key, Object* obj, |
| unsigned int arg_serial, Timespec mtime) |
| : Incremental_input_entry(filename_key, arg_serial, mtime), obj_(obj), |
| is_member_(false), sections_(), groups_() |
| { this->sections_.reserve(obj->shnum()); } |
| |
| // Get the object. |
| Object* |
| object() const |
| { return this->obj_; } |
| |
| // Record that this object is an archive member. |
| void |
| set_is_member() |
| { this->is_member_ = true; } |
| |
| // Return true if this object is an archive member. |
| bool |
| is_member() const |
| { return this->is_member_; } |
| |
| // Add an input section. |
| void |
| add_input_section(unsigned int shndx, Stringpool::Key name_key, off_t sh_size) |
| { this->sections_.push_back(Input_section(shndx, name_key, sh_size)); } |
| |
| // Return the number of input sections in this object. |
| unsigned int |
| get_input_section_count() const |
| { return this->sections_.size(); } |
| |
| // Return the input section index for the Nth input section. |
| Stringpool::Key |
| get_input_section_index(unsigned int n) const |
| { return this->sections_[n].shndx_; } |
| |
| // Return the stringpool key of the Nth input section. |
| Stringpool::Key |
| get_input_section_name_key(unsigned int n) const |
| { return this->sections_[n].name_key_; } |
| |
| // Return the size of the Nth input section. |
| off_t |
| get_input_section_size(unsigned int n) const |
| { return this->sections_[n].sh_size_; } |
| |
| // Add a kept COMDAT group. |
| void |
| add_comdat_group(Stringpool::Key signature_key) |
| { this->groups_.push_back(signature_key); } |
| |
| // Return the number of COMDAT groups. |
| unsigned int |
| get_comdat_group_count() const |
| { return this->groups_.size(); } |
| |
| // Return the stringpool key for the signature of the Nth comdat group. |
| Stringpool::Key |
| get_comdat_signature_key(unsigned int n) const |
| { return this->groups_[n]; } |
| |
| protected: |
| virtual Incremental_input_type |
| do_type() const |
| { |
| return (this->is_member_ |
| ? INCREMENTAL_INPUT_ARCHIVE_MEMBER |
| : INCREMENTAL_INPUT_OBJECT); |
| } |
| |
| // Return a pointer to the derived Incremental_object_entry object. |
| virtual Incremental_object_entry* |
| do_object_entry() |
| { return this; } |
| |
| private: |
| // The object file itself. |
| Object* obj_; |
| |
| // Whether this object is an archive member. |
| bool is_member_; |
| |
| // Input sections. |
| struct Input_section |
| { |
| Input_section(unsigned int shndx, Stringpool::Key name_key, off_t sh_size) |
| : shndx_(shndx), name_key_(name_key), sh_size_(sh_size) |
| { } |
| unsigned int shndx_; |
| Stringpool::Key name_key_; |
| off_t sh_size_; |
| }; |
| std::vector<Input_section> sections_; |
| |
| // COMDAT groups. |
| std::vector<Stringpool::Key> groups_; |
| }; |
| |
| // Class for recording shared library input files. |
| |
| class Incremental_dynobj_entry : public Incremental_input_entry |
| { |
| public: |
| Incremental_dynobj_entry(Stringpool::Key filename_key, |
| Stringpool::Key soname_key, Object* obj, |
| unsigned int arg_serial, Timespec mtime) |
| : Incremental_input_entry(filename_key, arg_serial, mtime), |
| soname_key_(soname_key), obj_(obj) |
| { } |
| |
| // Get the object. |
| Object* |
| object() const |
| { return this->obj_; } |
| |
| // Get the stringpool key for the soname. |
| Stringpool::Key |
| get_soname_key() const |
| { return this->soname_key_; } |
| |
| protected: |
| virtual Incremental_input_type |
| do_type() const |
| { return INCREMENTAL_INPUT_SHARED_LIBRARY; } |
| |
| // Return a pointer to the derived Incremental_dynobj_entry object. |
| virtual Incremental_dynobj_entry* |
| do_dynobj_entry() |
| { return this; } |
| |
| private: |
| // Key of the soname string in the section stringtable. |
| Stringpool::Key soname_key_; |
| |
| // The object file itself. |
| Object* obj_; |
| }; |
| |
| // Class for recording archive library input files. |
| |
| class Incremental_archive_entry : public Incremental_input_entry |
| { |
| public: |
| Incremental_archive_entry(Stringpool::Key filename_key, |
| unsigned int arg_serial, Timespec mtime) |
| : Incremental_input_entry(filename_key, arg_serial, mtime), members_(), |
| unused_syms_() |
| { } |
| |
| // Add a member object to the archive. |
| void |
| add_object(Incremental_object_entry* obj_entry) |
| { |
| this->members_.push_back(obj_entry); |
| obj_entry->set_is_member(); |
| } |
| |
| // Add an unused global symbol to the archive. |
| void |
| add_unused_global_symbol(Stringpool::Key symbol_key) |
| { this->unused_syms_.push_back(symbol_key); } |
| |
| // Return the number of member objects included in the link. |
| unsigned int |
| get_member_count() |
| { return this->members_.size(); } |
| |
| // Return the Nth member object. |
| Incremental_object_entry* |
| get_member(unsigned int n) |
| { return this->members_[n]; } |
| |
| // Return the number of unused global symbols in this archive. |
| unsigned int |
| get_unused_global_symbol_count() |
| { return this->unused_syms_.size(); } |
| |
| // Return the Nth unused global symbol. |
| Stringpool::Key |
| get_unused_global_symbol(unsigned int n) |
| { return this->unused_syms_[n]; } |
| |
| protected: |
| virtual Incremental_input_type |
| do_type() const |
| { return INCREMENTAL_INPUT_ARCHIVE; } |
| |
| // Return a pointer to the derived Incremental_archive_entry object. |
| virtual Incremental_archive_entry* |
| do_archive_entry() |
| { return this; } |
| |
| private: |
| // Members of the archive that have been included in the link. |
| std::vector<Incremental_object_entry*> members_; |
| |
| // Unused global symbols from this archive. |
| std::vector<Stringpool::Key> unused_syms_; |
| }; |
| |
| // This class contains the information needed during an incremental |
| // build about the inputs necessary to build the .gnu_incremental_inputs. |
| |
| class Incremental_inputs |
| { |
| public: |
| typedef std::vector<Incremental_input_entry*> Input_list; |
| |
| Incremental_inputs() |
| : inputs_(), command_line_(), command_line_key_(0), |
| strtab_(new Stringpool()), current_object_(NULL), |
| current_object_entry_(NULL), inputs_section_(NULL), |
| symtab_section_(NULL), relocs_section_(NULL), |
| reloc_count_(0) |
| { } |
| |
| ~Incremental_inputs() { delete this->strtab_; } |
| |
| // Record the command line. |
| void |
| report_command_line(int argc, const char* const* argv); |
| |
| // Record the initial info for archive file ARCHIVE. |
| void |
| report_archive_begin(Library_base* arch, unsigned int arg_serial, |
| Script_info* script_info); |
| |
| // Record the final info for archive file ARCHIVE. |
| void |
| report_archive_end(Library_base* arch); |
| |
| // Record the info for object file OBJ. If ARCH is not NULL, |
| // attach the object file to the archive. |
| void |
| report_object(Object* obj, unsigned int arg_serial, Library_base* arch, |
| Script_info* script_info); |
| |
| // Record an input section belonging to object file OBJ. |
| void |
| report_input_section(Object* obj, unsigned int shndx, const char* name, |
| off_t sh_size); |
| |
| // Record a kept COMDAT group belonging to object file OBJ. |
| void |
| report_comdat_group(Object* obj, const char* name); |
| |
| // Record the info for input script SCRIPT. |
| void |
| report_script(Script_info* script, unsigned int arg_serial, |
| Timespec mtime); |
| |
| // Return the running count of incremental relocations. |
| unsigned int |
| get_reloc_count() const |
| { return this->reloc_count_; } |
| |
| // Update the running count of incremental relocations. |
| void |
| set_reloc_count(unsigned int count) |
| { this->reloc_count_ = count; } |
| |
| // Prepare for layout. Called from Layout::finalize. |
| void |
| finalize(); |
| |
| // Create the .gnu_incremental_inputs and related sections. |
| void |
| create_data_sections(Symbol_table* symtab); |
| |
| // Return the .gnu_incremental_inputs section. |
| Output_section_data* |
| inputs_section() const |
| { return this->inputs_section_; } |
| |
| // Return the .gnu_incremental_symtab section. |
| Output_data_space* |
| symtab_section() const |
| { return this->symtab_section_; } |
| |
| // Return the .gnu_incremental_relocs section. |
| Output_data_space* |
| relocs_section() const |
| { return this->relocs_section_; } |
| |
| // Return the .gnu_incremental_got_plt section. |
| Output_data_space* |
| got_plt_section() const |
| { return this->got_plt_section_; } |
| |
| // Return the .gnu_incremental_strtab stringpool. |
| Stringpool* |
| get_stringpool() const |
| { return this->strtab_; } |
| |
| // Return the canonical form of the command line, as will be stored in |
| // .gnu_incremental_strtab. |
| const std::string& |
| command_line() const |
| { return this->command_line_; } |
| |
| // Return the stringpool key of the command line. |
| Stringpool::Key |
| command_line_key() const |
| { return this->command_line_key_; } |
| |
| // Return the number of input files. |
| int |
| input_file_count() const |
| { return this->inputs_.size(); } |
| |
| // Return the input files. |
| const Input_list& |
| input_files() const |
| { return this->inputs_; } |
| |
| // Return the sh_entsize value for the .gnu_incremental_relocs section. |
| unsigned int |
| relocs_entsize() const; |
| |
| private: |
| // The list of input files. |
| Input_list inputs_; |
| |
| // Canonical form of the command line, as will be stored in |
| // .gnu_incremental_strtab. |
| std::string command_line_; |
| |
| // The key of the command line string in the string pool. |
| Stringpool::Key command_line_key_; |
| |
| // The .gnu_incremental_strtab string pool associated with the |
| // .gnu_incremental_inputs. |
| Stringpool* strtab_; |
| |
| // Keep track of the object currently being processed. |
| Object* current_object_; |
| Incremental_object_entry* current_object_entry_; |
| |
| // The .gnu_incremental_inputs section. |
| Output_section_data* inputs_section_; |
| |
| // The .gnu_incremental_symtab section. |
| Output_data_space* symtab_section_; |
| |
| // The .gnu_incremental_relocs section. |
| Output_data_space* relocs_section_; |
| |
| // The .gnu_incremental_got_plt section. |
| Output_data_space* got_plt_section_; |
| |
| // Total count of incremental relocations. Updated during Scan_relocs |
| // phase at the completion of each object file. |
| unsigned int reloc_count_; |
| }; |
| |
| // Reader class for global symbol info from an object file entry in |
| // the .gnu_incremental_inputs section. |
| |
| template<bool big_endian> |
| class Incremental_global_symbol_reader |
| { |
| private: |
| typedef elfcpp::Swap<32, big_endian> Swap32; |
| |
| public: |
| Incremental_global_symbol_reader(const unsigned char* p) |
| : p_(p) |
| { } |
| |
| unsigned int |
| output_symndx() const |
| { return Swap32::readval(this->p_); } |
| |
| unsigned int |
| shndx() const |
| { return Swap32::readval(this->p_ + 4); } |
| |
| unsigned int |
| next_offset() const |
| { return Swap32::readval(this->p_ + 8); } |
| |
| unsigned int |
| reloc_count() const |
| { return Swap32::readval(this->p_ + 12); } |
| |
| unsigned int |
| reloc_offset() const |
| { return Swap32::readval(this->p_ + 16); } |
| |
| private: |
| // Base address of the symbol entry. |
| const unsigned char* p_; |
| }; |
| |
| // Reader class for .gnu_incremental_inputs section. |
| |
| template<int size, bool big_endian> |
| class Incremental_inputs_reader |
| { |
| private: |
| typedef elfcpp::Swap<size, big_endian> Swap; |
| typedef elfcpp::Swap<16, big_endian> Swap16; |
| typedef elfcpp::Swap<32, big_endian> Swap32; |
| typedef elfcpp::Swap<64, big_endian> Swap64; |
| |
| public: |
| // Size of the .gnu_incremental_inputs header. |
| // (3 x 4-byte fields, plus 4 bytes padding.) |
| static const unsigned int header_size = 16; |
| // Size of an input file entry. |
| // (2 x 4-byte fields, 1 x 12-byte field, 2 x 2-byte fields.) |
| static const unsigned int input_entry_size = 24; |
| // Size of the first part of the supplemental info block for |
| // relocatable objects and archive members. |
| // (7 x 4-byte fields, plus 4 bytes padding.) |
| static const unsigned int object_info_size = 32; |
| // Size of an input section entry. |
| // (2 x 4-byte fields, 2 x address-sized fields.) |
| static const unsigned int input_section_entry_size = 8 + 2 * size / 8; |
| // Size of a global symbol entry in the supplemental info block. |
| // (5 x 4-byte fields.) |
| static const unsigned int global_sym_entry_size = 20; |
| |
| Incremental_inputs_reader() |
| : p_(NULL), strtab_(NULL, 0), input_file_count_(0) |
| { } |
| |
| Incremental_inputs_reader(const unsigned char* p, |
| const elfcpp::Elf_strtab& strtab) |
| : p_(p), strtab_(strtab) |
| { this->input_file_count_ = Swap32::readval(this->p_ + 4); } |
| |
| // Return the version number. |
| unsigned int |
| version() const |
| { return Swap32::readval(this->p_); } |
| |
| // Return the count of input file entries. |
| unsigned int |
| input_file_count() const |
| { return this->input_file_count_; } |
| |
| // Return the command line. |
| const char* |
| command_line() const |
| { |
| unsigned int offset = Swap32::readval(this->p_ + 8); |
| return this->get_string(offset); |
| } |
| |
| // Reader class for an input file entry and its supplemental info. |
| class Incremental_input_entry_reader |
| { |
| private: |
| static const unsigned int object_info_size = |
| Incremental_inputs_reader<size, big_endian>::object_info_size; |
| static const unsigned int input_section_entry_size = |
| Incremental_inputs_reader<size, big_endian>::input_section_entry_size; |
| static const unsigned int global_sym_entry_size = |
| Incremental_inputs_reader<size, big_endian>::global_sym_entry_size; |
| |
| public: |
| Incremental_input_entry_reader(const Incremental_inputs_reader* inputs, |
| unsigned int offset) |
| : inputs_(inputs), offset_(offset) |
| { |
| this->info_offset_ = Swap32::readval(inputs->p_ + offset + 4); |
| this->flags_ = Swap16::readval(this->inputs_->p_ + offset + 20); |
| } |
| |
| // Return the filename. |
| const char* |
| filename() const |
| { |
| unsigned int offset = Swap32::readval(this->inputs_->p_ + this->offset_); |
| return this->inputs_->get_string(offset); |
| } |
| |
| // Return the argument serial number. |
| unsigned int |
| arg_serial() const |
| { |
| return Swap16::readval(this->inputs_->p_ + this->offset_ + 22); |
| } |
| |
| // Return the timestamp. |
| Timespec |
| get_mtime() const |
| { |
| Timespec t; |
| const unsigned char* p = this->inputs_->p_ + this->offset_ + 8; |
| t.seconds = Swap64::readval(p); |
| t.nanoseconds = Swap32::readval(p+8); |
| return t; |
| } |
| |
| // Return the type of input file. |
| Incremental_input_type |
| type() const |
| { return static_cast<Incremental_input_type>(this->flags_ & 0xff); } |
| |
| // Return TRUE if the file was found in a system directory. |
| bool |
| is_in_system_directory() const |
| { return (this->flags_ & INCREMENTAL_INPUT_IN_SYSTEM_DIR) != 0; } |
| |
| // Return TRUE if the file was linked with --as-needed. |
| bool |
| as_needed() const |
| { return (this->flags_ & INCREMENTAL_INPUT_AS_NEEDED) != 0; } |
| |
| // Return the input section count -- for objects only. |
| unsigned int |
| get_input_section_count() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_); |
| } |
| |
| // Return the soname -- for shared libraries only. |
| const char* |
| get_soname() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY); |
| unsigned int offset = Swap32::readval(this->inputs_->p_ |
| + this->info_offset_); |
| return this->inputs_->get_string(offset); |
| } |
| |
| // Return the offset of the supplemental info for symbol SYMNDX -- |
| // for objects only. |
| unsigned int |
| get_symbol_offset(unsigned int symndx) const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| |
| unsigned int section_count = this->get_input_section_count(); |
| return (this->info_offset_ |
| + this->object_info_size |
| + section_count * this->input_section_entry_size |
| + symndx * this->global_sym_entry_size); |
| } |
| |
| // Return the global symbol count -- for objects & shared libraries only. |
| unsigned int |
| get_global_symbol_count() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER |
| || this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY); |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4); |
| } |
| |
| // Return the offset of the first local symbol -- for objects only. |
| unsigned int |
| get_local_symbol_offset() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 8); |
| } |
| |
| // Return the local symbol count -- for objects only. |
| unsigned int |
| get_local_symbol_count() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 12); |
| } |
| |
| // Return the index of the first dynamic relocation -- for objects only. |
| unsigned int |
| get_first_dyn_reloc() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 16); |
| } |
| |
| // Return the dynamic relocation count -- for objects only. |
| unsigned int |
| get_dyn_reloc_count() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 20); |
| } |
| |
| // Return the COMDAT group count -- for objects only. |
| unsigned int |
| get_comdat_group_count() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 24); |
| } |
| |
| // Return the object count -- for scripts only. |
| unsigned int |
| get_object_count() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_SCRIPT); |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_); |
| } |
| |
| // Return the input file offset for object N -- for scripts only. |
| unsigned int |
| get_object_offset(unsigned int n) const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_SCRIPT); |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ |
| + 4 + n * 4); |
| } |
| |
| // Return the member count -- for archives only. |
| unsigned int |
| get_member_count() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE); |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_); |
| } |
| |
| // Return the unused symbol count -- for archives only. |
| unsigned int |
| get_unused_symbol_count() const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE); |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4); |
| } |
| |
| // Return the input file offset for archive member N -- for archives only. |
| unsigned int |
| get_member_offset(unsigned int n) const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE); |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ |
| + 8 + n * 4); |
| } |
| |
| // Return the Nth unused global symbol -- for archives only. |
| const char* |
| get_unused_symbol(unsigned int n) const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_ARCHIVE); |
| unsigned int member_count = this->get_member_count(); |
| unsigned int offset = Swap32::readval(this->inputs_->p_ |
| + this->info_offset_ + 8 |
| + member_count * 4 |
| + n * 4); |
| return this->inputs_->get_string(offset); |
| } |
| |
| // Information about an input section. |
| struct Input_section_info |
| { |
| const char* name; |
| unsigned int output_shndx; |
| off_t sh_offset; |
| off_t sh_size; |
| }; |
| |
| // Return info about the Nth input section -- for objects only. |
| Input_section_info |
| get_input_section(unsigned int n) const |
| { |
| Input_section_info info; |
| const unsigned char* p = (this->inputs_->p_ |
| + this->info_offset_ |
| + this->object_info_size |
| + n * this->input_section_entry_size); |
| unsigned int name_offset = Swap32::readval(p); |
| info.name = this->inputs_->get_string(name_offset); |
| info.output_shndx = Swap32::readval(p + 4); |
| info.sh_offset = Swap::readval(p + 8); |
| info.sh_size = Swap::readval(p + 8 + size / 8); |
| return info; |
| } |
| |
| // Return info about the Nth global symbol -- for objects only. |
| Incremental_global_symbol_reader<big_endian> |
| get_global_symbol_reader(unsigned int n) const |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_OBJECT |
| || this->type() == INCREMENTAL_INPUT_ARCHIVE_MEMBER); |
| unsigned int section_count = this->get_input_section_count(); |
| const unsigned char* p = (this->inputs_->p_ |
| + this->info_offset_ |
| + this->object_info_size |
| + section_count * this->input_section_entry_size |
| + n * this->global_sym_entry_size); |
| return Incremental_global_symbol_reader<big_endian>(p); |
| } |
| |
| // Return the signature of the Nth comdat group -- for objects only. |
| const char* |
| get_comdat_group_signature(unsigned int n) const |
| { |
| unsigned int section_count = this->get_input_section_count(); |
| unsigned int symbol_count = this->get_global_symbol_count(); |
| const unsigned char* p = (this->inputs_->p_ |
| + this->info_offset_ |
| + this->object_info_size |
| + section_count * this->input_section_entry_size |
| + symbol_count * this->global_sym_entry_size |
| + n * 4); |
| unsigned int name_offset = Swap32::readval(p); |
| return this->inputs_->get_string(name_offset); |
| } |
| |
| // Return the output symbol index for the Nth global symbol -- for shared |
| // libraries only. Sets *IS_DEF to TRUE if the symbol is defined in this |
| // input file. Sets *IS_COPY to TRUE if the symbol was copied from this |
| // input file with a COPY relocation. |
| unsigned int |
| get_output_symbol_index(unsigned int n, bool* is_def, bool* is_copy) |
| { |
| gold_assert(this->type() == INCREMENTAL_INPUT_SHARED_LIBRARY); |
| const unsigned char* p = (this->inputs_->p_ |
| + this->info_offset_ + 8 |
| + n * 4); |
| unsigned int output_symndx = Swap32::readval(p); |
| unsigned int flags = output_symndx >> INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT; |
| output_symndx &= ((1U << INCREMENTAL_SHLIB_SYM_FLAGS_SHIFT) - 1); |
| switch (flags) |
| { |
| case INCREMENTAL_SHLIB_SYM_DEF: |
| *is_def = true; |
| *is_copy = false; |
| break; |
| case INCREMENTAL_SHLIB_SYM_COPY: |
| *is_def = true; |
| *is_copy = true; |
| break; |
| default: |
| *is_def = false; |
| *is_copy = false; |
| } |
| return output_symndx; |
| } |
| |
| private: |
| // The reader instance for the containing section. |
| const Incremental_inputs_reader* inputs_; |
| // The flags, including the type of input file. |
| unsigned int flags_; |
| // Section offset to the input file entry. |
| unsigned int offset_; |
| // Section offset to the supplemental info for the input file. |
| unsigned int info_offset_; |
| }; |
| |
| // Return the offset of an input file entry given its index N. |
| unsigned int |
| input_file_offset(unsigned int n) const |
| { |
| gold_assert(n < this->input_file_count_); |
| return this->header_size + n * this->input_entry_size; |
| } |
| |
| // Return the index of an input file entry given its OFFSET. |
| unsigned int |
| input_file_index(unsigned int offset) const |
| { |
| int n = ((offset - this->header_size) / this->input_entry_size); |
| gold_assert(input_file_offset(n) == offset); |
| return n; |
| } |
| |
| // Return a reader for the Nth input file entry. |
| Incremental_input_entry_reader |
| input_file(unsigned int n) const |
| { return Incremental_input_entry_reader(this, this->input_file_offset(n)); } |
| |
| // Return a reader for the input file entry at OFFSET. |
| Incremental_input_entry_reader |
| input_file_at_offset(unsigned int offset) const |
| { |
| gold_assert(offset < (this->header_size |
| + this->input_file_count_ * this->input_entry_size)); |
| return Incremental_input_entry_reader(this, offset); |
| } |
| |
| // Return a reader for the global symbol info at OFFSET. |
| Incremental_global_symbol_reader<big_endian> |
| global_symbol_reader_at_offset(unsigned int offset) const |
| { |
| const unsigned char* p = this->p_ + offset; |
| return Incremental_global_symbol_reader<big_endian>(p); |
| } |
| |
| private: |
| // Lookup a string in the ELF string table. |
| const char* get_string(unsigned int offset) const |
| { |
| const char* s; |
| if (this->strtab_.get_c_string(offset, &s)) |
| return s; |
| return NULL; |
| } |
| |
| // Base address of the .gnu_incremental_inputs section. |
| const unsigned char* p_; |
| // The associated ELF string table. |
| elfcpp::Elf_strtab strtab_; |
| // The number of input file entries in this section. |
| unsigned int input_file_count_; |
| }; |
| |
| // Reader class for the .gnu_incremental_symtab section. |
| |
| template<bool big_endian> |
| class Incremental_symtab_reader |
| { |
| public: |
| Incremental_symtab_reader() |
| : p_(NULL), len_(0) |
| { } |
| |
| Incremental_symtab_reader(const unsigned char* p, off_t len) |
| : p_(p), len_(len) |
| { } |
| |
| // Return the count of symbols in this section. |
| unsigned int |
| symbol_count() const |
| { return static_cast<unsigned int>(this->len_ / 4); } |
| |
| // Return the list head for symbol table entry N. |
| unsigned int |
| get_list_head(unsigned int n) const |
| { return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4 * n); } |
| |
| private: |
| // Base address of the .gnu_incremental_relocs section. |
| const unsigned char* p_; |
| // Size of the section. |
| off_t len_; |
| }; |
| |
| // Reader class for the .gnu_incremental_relocs section. |
| |
| template<int size, bool big_endian> |
| class Incremental_relocs_reader |
| { |
| private: |
| // Size of each field. |
| static const unsigned int field_size = size / 8; |
| |
| public: |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| typedef typename elfcpp::Elf_types<size>::Elf_Swxword Addend; |
| |
| // Size of each entry. |
| static const unsigned int reloc_size = 8 + 2 * field_size; |
| |
| Incremental_relocs_reader() |
| : p_(NULL), len_(0) |
| { } |
| |
| Incremental_relocs_reader(const unsigned char* p, off_t len) |
| : p_(p), len_(len) |
| { } |
| |
| // Return the count of relocations in this section. |
| unsigned int |
| reloc_count() const |
| { return static_cast<unsigned int>(this->len_ / reloc_size); } |
| |
| // Return the relocation type for relocation entry at offset OFF. |
| unsigned int |
| get_r_type(unsigned int off) const |
| { return elfcpp::Swap<32, big_endian>::readval(this->p_ + off); } |
| |
| // Return the output section index for relocation entry at offset OFF. |
| unsigned int |
| get_r_shndx(unsigned int off) const |
| { return elfcpp::Swap<32, big_endian>::readval(this->p_ + off + 4); } |
| |
| // Return the output section offset for relocation entry at offset OFF. |
| Address |
| get_r_offset(unsigned int off) const |
| { return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8); } |
| |
| // Return the addend for relocation entry at offset OFF. |
| Addend |
| get_r_addend(unsigned int off) const |
| { |
| return elfcpp::Swap<size, big_endian>::readval(this->p_ + off + 8 |
| + this->field_size); |
| } |
| |
| // Return a pointer to the relocation entry at offset OFF. |
| const unsigned char* |
| data(unsigned int off) const |
| { return this->p_ + off; } |
| |
| private: |
| // Base address of the .gnu_incremental_relocs section. |
| const unsigned char* p_; |
| // Size of the section. |
| off_t len_; |
| }; |
| |
| // Reader class for the .gnu_incremental_got_plt section. |
| |
| template<bool big_endian> |
| class Incremental_got_plt_reader |
| { |
| public: |
| Incremental_got_plt_reader() |
| : p_(NULL), got_count_(0), got_desc_p_(NULL), plt_desc_p_(NULL) |
| { } |
| |
| Incremental_got_plt_reader(const unsigned char* p) : p_(p) |
| { |
| this->got_count_ = elfcpp::Swap<32, big_endian>::readval(p); |
| this->got_desc_p_ = p + 8 + ((this->got_count_ + 3) & ~3); |
| this->plt_desc_p_ = this->got_desc_p_ + this->got_count_ * 8; |
| } |
| |
| // Return the GOT entry count. |
| unsigned int |
| get_got_entry_count() const |
| { |
| return this->got_count_; |
| } |
| |
| // Return the PLT entry count. |
| unsigned int |
| get_plt_entry_count() const |
| { |
| return elfcpp::Swap<32, big_endian>::readval(this->p_ + 4); |
| } |
| |
| // Return the GOT type for GOT entry N. |
| unsigned int |
| get_got_type(unsigned int n) |
| { |
| return this->p_[8 + n]; |
| } |
| |
| // Return the symbol index for GOT entry N. |
| unsigned int |
| get_got_symndx(unsigned int n) |
| { |
| return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 8); |
| } |
| |
| // Return the input file index for GOT entry N. |
| unsigned int |
| get_got_input_index(unsigned int n) |
| { |
| return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 8 + 4); |
| } |
| |
| // Return the PLT descriptor for PLT entry N. |
| unsigned int |
| get_plt_desc(unsigned int n) |
| { |
| return elfcpp::Swap<32, big_endian>::readval(this->plt_desc_p_ + n * 4); |
| } |
| |
| private: |
| // Base address of the .gnu_incremental_got_plt section. |
| const unsigned char* p_; |
| // GOT entry count. |
| unsigned int got_count_; |
| // Base address of the GOT descriptor array. |
| const unsigned char* got_desc_p_; |
| // Base address of the PLT descriptor array. |
| const unsigned char* plt_desc_p_; |
| }; |
| |
| // An object representing the ELF file we edit during an incremental build. |
| // Similar to Object or Dynobj, but operates on Output_file and contains |
| // methods to support incremental updating. This is the abstract parent class |
| // implemented in Sized_incremental_binary<size, big_endian> for a specific |
| // endianness and size. |
| |
| class Incremental_binary |
| { |
| public: |
| Incremental_binary(Output_file* output, Target* /*target*/) |
| : input_args_map_(), library_map_(), script_map_(), |
| output_(output) |
| { } |
| |
| virtual |
| ~Incremental_binary() |
| { } |
| |
| // Check the .gnu_incremental_inputs section to see whether an incremental |
| // build is possible. |
| bool |
| check_inputs(const Command_line& cmdline, |
| Incremental_inputs* incremental_inputs) |
| { return this->do_check_inputs(cmdline, incremental_inputs); } |
| |
| // Report an error. |
| void |
| error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
| |
| // Proxy class for a sized Incremental_input_entry_reader. |
| |
| class Input_reader |
| { |
| public: |
| Input_reader() |
| { } |
| |
| Input_reader(const Input_reader&) |
| { } |
| |
| virtual |
| ~Input_reader() |
| { } |
| |
| const char* |
| filename() const |
| { return this->do_filename(); } |
| |
| Timespec |
| get_mtime() const |
| { return this->do_get_mtime(); } |
| |
| Incremental_input_type |
| type() const |
| { return this->do_type(); } |
| |
| unsigned int |
| arg_serial() const |
| { return this->do_arg_serial(); } |
| |
| unsigned int |
| get_unused_symbol_count() const |
| { return this->do_get_unused_symbol_count(); } |
| |
| const char* |
| get_unused_symbol(unsigned int n) const |
| { return this->do_get_unused_symbol(n); } |
| |
| protected: |
| virtual const char* |
| do_filename() const = 0; |
| |
| virtual Timespec |
| do_get_mtime() const = 0; |
| |
| virtual Incremental_input_type |
| do_type() const = 0; |
| |
| virtual unsigned int |
| do_arg_serial() const = 0; |
| |
| virtual unsigned int |
| do_get_unused_symbol_count() const = 0; |
| |
| virtual const char* |
| do_get_unused_symbol(unsigned int n) const = 0; |
| }; |
| |
| // Return the number of input files. |
| unsigned int |
| input_file_count() const |
| { return this->do_input_file_count(); } |
| |
| // Return an Input_reader for input file N. |
| const Input_reader* |
| get_input_reader(unsigned int n) const |
| { return this->do_get_input_reader(n); } |
| |
| // Return TRUE if the input file N has changed since the last link. |
| bool |
| file_has_changed(unsigned int n) const |
| { return this->do_file_has_changed(n); } |
| |
| // Return the Input_argument for input file N. Returns NULL if |
| // the Input_argument is not available. |
| const Input_argument* |
| get_input_argument(unsigned int n) const |
| { |
| const Input_reader* input_file = this->do_get_input_reader(n); |
| unsigned int arg_serial = input_file->arg_serial(); |
| if (arg_serial == 0 || arg_serial > this->input_args_map_.size()) |
| return NULL; |
| return this->input_args_map_[arg_serial - 1]; |
| } |
| |
| // Return an Incremental_library for the given input file. |
| Incremental_library* |
| get_library(unsigned int n) const |
| { return this->library_map_[n]; } |
| |
| // Return a Script_info for the given input file. |
| Script_info* |
| get_script_info(unsigned int n) const |
| { return this->script_map_[n]; } |
| |
| // Initialize the layout of the output file based on the existing |
| // output file. |
| void |
| init_layout(Layout* layout) |
| { this->do_init_layout(layout); } |
| |
| // Mark regions of the input file that must be kept unchanged. |
| void |
| reserve_layout(unsigned int input_file_index) |
| { this->do_reserve_layout(input_file_index); } |
| |
| // Process the GOT and PLT entries from the existing output file. |
| void |
| process_got_plt(Symbol_table* symtab, Layout* layout) |
| { this->do_process_got_plt(symtab, layout); } |
| |
| // Emit COPY relocations from the existing output file. |
| void |
| emit_copy_relocs(Symbol_table* symtab) |
| { this->do_emit_copy_relocs(symtab); } |
| |
| // Apply incremental relocations for symbols whose values have changed. |
| void |
| apply_incremental_relocs(const Symbol_table* symtab, Layout* layout, |
| Output_file* of) |
| { this->do_apply_incremental_relocs(symtab, layout, of); } |
| |
| // Functions and types for the elfcpp::Elf_file interface. This |
| // permit us to use Incremental_binary as the File template parameter for |
| // elfcpp::Elf_file. |
| |
| // The View class is returned by view. It must support a single |
| // method, data(). This is trivial, because Output_file::get_output_view |
| // does what we need. |
| class View |
| { |
| public: |
| View(const unsigned char* p) |
| : p_(p) |
| { } |
| |
| const unsigned char* |
| data() const |
| { return this->p_; } |
| |
| private: |
| const unsigned char* p_; |
| }; |
| |
| // Return a View. |
| View |
| view(off_t file_offset, section_size_type data_size) |
| { return View(this->output_->get_input_view(file_offset, data_size)); } |
| |
| // A location in the file. |
| struct Location |
| { |
| off_t file_offset; |
| off_t data_size; |
| |
| Location(off_t fo, section_size_type ds) |
| : file_offset(fo), data_size(ds) |
| { } |
| |
| Location() |
| : file_offset(0), data_size(0) |
| { } |
| }; |
| |
| // Get a View given a Location. |
| View |
| view(Location loc) |
| { return View(this->view(loc.file_offset, loc.data_size)); } |
| |
| // Return the Output_file. |
| Output_file* |
| output_file() |
| { return this->output_; } |
| |
| protected: |
| // Check the .gnu_incremental_inputs section to see whether an incremental |
| // build is possible. |
| virtual bool |
| do_check_inputs(const Command_line& cmdline, |
| Incremental_inputs* incremental_inputs) = 0; |
| |
| // Return TRUE if input file N has changed since the last incremental link. |
| virtual bool |
| do_file_has_changed(unsigned int n) const = 0; |
| |
| // Initialize the layout of the output file based on the existing |
| // output file. |
| virtual void |
| do_init_layout(Layout* layout) = 0; |
| |
| // Mark regions of the input file that must be kept unchanged. |
| virtual void |
| do_reserve_layout(unsigned int input_file_index) = 0; |
| |
| // Process the GOT and PLT entries from the existing output file. |
| virtual void |
| do_process_got_plt(Symbol_table* symtab, Layout* layout) = 0; |
| |
| // Emit COPY relocations from the existing output file. |
| virtual void |
| do_emit_copy_relocs(Symbol_table* symtab) = 0; |
| |
| // Apply incremental relocations for symbols whose values have changed. |
| virtual void |
| do_apply_incremental_relocs(const Symbol_table*, Layout*, Output_file*) = 0; |
| |
| virtual unsigned int |
| do_input_file_count() const = 0; |
| |
| virtual const Input_reader* |
| do_get_input_reader(unsigned int) const = 0; |
| |
| // Map from input file index to Input_argument. |
| std::vector<const Input_argument*> input_args_map_; |
| // Map from an input file index to an Incremental_library. |
| std::vector<Incremental_library*> library_map_; |
| // Map from an input file index to a Script_info. |
| std::vector<Script_info*> script_map_; |
| |
| private: |
| // Edited output file object. |
| Output_file* output_; |
| }; |
| |
| template<int size, bool big_endian> |
| class Sized_relobj_incr; |
| |
| template<int size, bool big_endian> |
| class Sized_incremental_binary : public Incremental_binary |
| { |
| public: |
| Sized_incremental_binary(Output_file* output, |
| const elfcpp::Ehdr<size, big_endian>& ehdr, |
| Target* target) |
| : Incremental_binary(output, target), elf_file_(this, ehdr), |
| input_objects_(), section_map_(), symbol_map_(), copy_relocs_(), |
| main_symtab_loc_(), main_strtab_loc_(), has_incremental_info_(false), |
| inputs_reader_(), symtab_reader_(), relocs_reader_(), got_plt_reader_(), |
| input_entry_readers_() |
| { this->setup_readers(); } |
| |
| // Returns TRUE if the file contains incremental info. |
| bool |
| has_incremental_info() const |
| { return this->has_incremental_info_; } |
| |
| // Record a pointer to the object for input file N. |
| void |
| set_input_object(unsigned int n, |
| Sized_relobj_incr<size, big_endian>* obj) |
| { this->input_objects_[n] = obj; } |
| |
| // Return a pointer to the object for input file N. |
| Sized_relobj_incr<size, big_endian>* |
| input_object(unsigned int n) const |
| { |
| gold_assert(n < this->input_objects_.size()); |
| return this->input_objects_[n]; |
| } |
| |
| // Return the Output_section for section index SHNDX. |
| Output_section* |
| output_section(unsigned int shndx) |
| { return this->section_map_[shndx]; } |
| |
| // Map a symbol table entry from the base file to the output symbol table. |
| // SYMNDX is relative to the first forced-local or global symbol in the |
| // input file symbol table. |
| void |
| add_global_symbol(unsigned int symndx, Symbol* gsym) |
| { this->symbol_map_[symndx] = gsym; } |
| |
| // Map a symbol table entry from the base file to the output symbol table. |
| // SYMNDX is relative to the first forced-local or global symbol in the |
| // input file symbol table. |
| Symbol* |
| global_symbol(unsigned int symndx) const |
| { return this->symbol_map_[symndx]; } |
| |
| // Add a COPY relocation for a global symbol. |
| void |
| add_copy_reloc(Symbol* gsym, Output_section* os, off_t offset) |
| { this->copy_relocs_.push_back(Copy_reloc(gsym, os, offset)); } |
| |
| // Readers for the incremental info sections. |
| |
| const Incremental_inputs_reader<size, big_endian>& |
| inputs_reader() const |
| { return this->inputs_reader_; } |
| |
| const Incremental_symtab_reader<big_endian>& |
| symtab_reader() const |
| { return this->symtab_reader_; } |
| |
| const Incremental_relocs_reader<size, big_endian>& |
| relocs_reader() const |
| { return this->relocs_reader_; } |
| |
| const Incremental_got_plt_reader<big_endian>& |
| got_plt_reader() const |
| { return this->got_plt_reader_; } |
| |
| void |
| get_symtab_view(View* symtab_view, unsigned int* sym_count, |
| elfcpp::Elf_strtab* strtab); |
| |
| protected: |
| typedef Incremental_inputs_reader<size, big_endian> Inputs_reader; |
| typedef typename Inputs_reader::Incremental_input_entry_reader |
| Input_entry_reader; |
| |
| virtual bool |
| do_check_inputs(const Command_line& cmdline, |
| Incremental_inputs* incremental_inputs); |
| |
| // Return TRUE if input file N has changed since the last incremental link. |
| virtual bool |
| do_file_has_changed(unsigned int n) const; |
| |
| // Initialize the layout of the output file based on the existing |
| // output file. |
| virtual void |
| do_init_layout(Layout* layout); |
| |
| // Mark regions of the input file that must be kept unchanged. |
| virtual void |
| do_reserve_layout(unsigned int input_file_index); |
| |
| // Process the GOT and PLT entries from the existing output file. |
| virtual void |
| do_process_got_plt(Symbol_table* symtab, Layout* layout); |
| |
| // Emit COPY relocations from the existing output file. |
| virtual void |
| do_emit_copy_relocs(Symbol_table* symtab); |
| |
| // Apply incremental relocations for symbols whose values have changed. |
| virtual void |
| do_apply_incremental_relocs(const Symbol_table* symtab, Layout* layout, |
| Output_file* of); |
| |
| // Proxy class for a sized Incremental_input_entry_reader. |
| |
| class Sized_input_reader : public Input_reader |
| { |
| public: |
| Sized_input_reader(Input_entry_reader r) |
| : Input_reader(), reader_(r) |
| { } |
| |
| Sized_input_reader(const Sized_input_reader& r) |
| : Input_reader(), reader_(r.reader_) |
| { } |
| |
| virtual |
| ~Sized_input_reader() |
| { } |
| |
| private: |
| const char* |
| do_filename() const |
| { return this->reader_.filename(); } |
| |
| Timespec |
| do_get_mtime() const |
| { return this->reader_.get_mtime(); } |
| |
| Incremental_input_type |
| do_type() const |
| { return this->reader_.type(); } |
| |
| unsigned int |
| do_arg_serial() const |
| { return this->reader_.arg_serial(); } |
| |
| unsigned int |
| do_get_unused_symbol_count() const |
| { return this->reader_.get_unused_symbol_count(); } |
| |
| const char* |
| do_get_unused_symbol(unsigned int n) const |
| { return this->reader_.get_unused_symbol(n); } |
| |
| Input_entry_reader reader_; |
| }; |
| |
| virtual unsigned int |
| do_input_file_count() const |
| { return this->inputs_reader_.input_file_count(); } |
| |
| virtual const Input_reader* |
| do_get_input_reader(unsigned int n) const |
| { |
| gold_assert(n < this->input_entry_readers_.size()); |
| return &this->input_entry_readers_[n]; |
| } |
| |
| private: |
| // List of symbols that need COPY relocations. |
| struct Copy_reloc |
| { |
| Copy_reloc(Symbol* sym, Output_section* os, off_t off) |
| : symbol(sym), output_section(os), offset(off) |
| { } |
| |
| // The global symbol to copy. |
| Symbol* symbol; |
| // The output section into which the symbol was copied. |
| Output_section* output_section; |
| // The offset within that output section. |
| off_t offset; |
| }; |
| typedef std::vector<Copy_reloc> Copy_relocs; |
| |
| bool |
| find_incremental_inputs_sections(unsigned int* p_inputs_shndx, |
| unsigned int* p_symtab_shndx, |
| unsigned int* p_relocs_shndx, |
| unsigned int* p_got_plt_shndx, |
| unsigned int* p_strtab_shndx); |
| |
| void |
| setup_readers(); |
| |
| // Output as an ELF file. |
| elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file_; |
| |
| // Vector of pointers to the input objects for the unchanged files. |
| // For replaced files, the corresponding pointer is NULL. |
| std::vector<Sized_relobj_incr<size, big_endian>*> input_objects_; |
| |
| // Map section index to an Output_section in the updated layout. |
| std::vector<Output_section*> section_map_; |
| |
| // Map global symbols from the input file to the symbol table. |
| std::vector<Symbol*> symbol_map_; |
| |
| // List of symbols that need COPY relocations. |
| Copy_relocs copy_relocs_; |
| |
| // Locations of the main symbol table and symbol string table. |
| Location main_symtab_loc_; |
| Location main_strtab_loc_; |
| |
| // Readers for the incremental info sections. |
| bool has_incremental_info_; |
| Incremental_inputs_reader<size, big_endian> inputs_reader_; |
| Incremental_symtab_reader<big_endian> symtab_reader_; |
| Incremental_relocs_reader<size, big_endian> relocs_reader_; |
| Incremental_got_plt_reader<big_endian> got_plt_reader_; |
| std::vector<Sized_input_reader> input_entry_readers_; |
| }; |
| |
| // An incremental Relobj. This class represents a relocatable object |
| // that has not changed since the last incremental link, and whose contents |
| // can be used directly from the base file. |
| |
| template<int size, bool big_endian> |
| class Sized_relobj_incr : public Sized_relobj<size, big_endian> |
| { |
| public: |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| typedef typename Sized_relobj<size, big_endian>::Symbols Symbols; |
| |
| Sized_relobj_incr(const std::string& name, |
| Sized_incremental_binary<size, big_endian>* ibase, |
| unsigned int input_file_index); |
| |
| private: |
| // For convenience. |
| typedef Sized_relobj_incr<size, big_endian> This; |
| static const int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| |
| typedef typename Sized_relobj<size, big_endian>::Output_sections |
| Output_sections; |
| typedef Incremental_inputs_reader<size, big_endian> Inputs_reader; |
| typedef typename Inputs_reader::Incremental_input_entry_reader |
| Input_entry_reader; |
| |
| // A local symbol. |
| struct Local_symbol |
| { |
| Local_symbol(const char* name_, Address value_, unsigned int size_, |
| unsigned int shndx_, unsigned int type_, |
| bool needs_dynsym_entry_) |
| : st_value(value_), name(name_), st_size(size_), st_shndx(shndx_), |
| st_type(type_), output_dynsym_index(0), |
| needs_dynsym_entry(needs_dynsym_entry_) |
| { } |
| // The symbol value. |
| Address st_value; |
| // The symbol name. This points to the stringpool entry. |
| const char* name; |
| // The symbol size. |
| unsigned int st_size; |
| // The output section index. |
| unsigned int st_shndx : 28; |
| // The symbol type. |
| unsigned int st_type : 4; |
| // The index of the symbol in the output dynamic symbol table. |
| unsigned int output_dynsym_index : 31; |
| // TRUE if the symbol needs to appear in the dynamic symbol table. |
| unsigned int needs_dynsym_entry : 1; |
| }; |
| |
| // Return TRUE if this is an incremental (unchanged) input file. |
| bool |
| do_is_incremental() const |
| { return true; } |
| |
| // Return the last modified time of the file. |
| Timespec |
| do_get_mtime() |
| { return this->input_reader_.get_mtime(); } |
| |
| // Read the symbols. |
| void |
| do_read_symbols(Read_symbols_data*); |
| |
| // Lay out the input sections. |
| void |
| do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
| |
| // Layout sections whose layout was deferred while waiting for |
| // input files from a plugin. |
| void |
| do_layout_deferred_sections(Layout*); |
| |
| // Add the symbols to the symbol table. |
| void |
| do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
| |
| Archive::Should_include |
| do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, |
| std::string* why); |
| |
| // Iterate over global symbols, calling a visitor class V for each. |
| void |
| do_for_all_global_symbols(Read_symbols_data* sd, |
| Library_base::Symbol_visitor_base* v); |
| |
| // Get the size of a section. |
| uint64_t |
| do_section_size(unsigned int shndx); |
| |
| // Get the name of a section. |
| std::string |
| do_section_name(unsigned int shndx) const; |
| |
| // Return a view of the contents of a section. |
| const unsigned char* |
| do_section_contents(unsigned int shndx, section_size_type* plen, |
| bool cache); |
| |
| // Return section flags. |
| uint64_t |
| do_section_flags(unsigned int shndx); |
| |
| // Return section entsize. |
| uint64_t |
| do_section_entsize(unsigned int shndx); |
| |
| // Return section address. |
| uint64_t |
| do_section_address(unsigned int shndx); |
| |
| // Return section type. |
| unsigned int |
| do_section_type(unsigned int shndx); |
| |
| // Return the section link field. |
| unsigned int |
| do_section_link(unsigned int shndx); |
| |
| // Return the section link field. |
| unsigned int |
| do_section_info(unsigned int shndx); |
| |
| // Return the section alignment. |
| uint64_t |
| do_section_addralign(unsigned int shndx); |
| |
| // Return the Xindex structure to use. |
| Xindex* |
| do_initialize_xindex(); |
| |
| // Get symbol counts. |
| void |
| do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; |
| |
| // Get global symbols. |
| const Symbols* |
| do_get_global_symbols() const |
| { return &this->symbols_; } |
| |
| // Return the value of a local symbol. |
| uint64_t |
| do_local_symbol_value(unsigned int, uint64_t) const |
| { gold_unreachable(); } |
| |
| unsigned int |
| do_local_plt_offset(unsigned int) const |
| { gold_unreachable(); } |
| |
| bool |
| do_local_is_tls(unsigned int) const |
| { gold_unreachable(); } |
| |
| // Return the number of local symbols. |
| unsigned int |
| do_local_symbol_count() const |
| { return this->local_symbol_count_; } |
| |
| // Return the number of local symbols in the output symbol table. |
| unsigned int |
| do_output_local_symbol_count() const |
| { return this->local_symbol_count_; } |
| |
| // Return the file offset for local symbols in the output symbol table. |
| off_t |
| do_local_symbol_offset() const |
| { return this->local_symbol_offset_; } |
| |
| // Read the relocs. |
| void |
| do_read_relocs(Read_relocs_data*); |
| |
| // Process the relocs to find list of referenced sections. Used only |
| // during garbage collection. |
| void |
| do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
| |
| // Scan the relocs and adjust the symbol table. |
| void |
| do_scan_relocs(Symbol_table*, Layout*, Read_relocs_data*); |
| |
| // Count the local symbols. |
| void |
| do_count_local_symbols(Stringpool_template<char>*, |
| Stringpool_template<char>*); |
| |
| // Finalize the local symbols. |
| unsigned int |
| do_finalize_local_symbols(unsigned int, off_t, Symbol_table*); |
| |
| // Set the offset where local dynamic symbol information will be stored. |
| unsigned int |
| do_set_local_dynsym_indexes(unsigned int); |
| |
| // Set the offset where local dynamic symbol information will be stored. |
| unsigned int |
| do_set_local_dynsym_offset(off_t); |
| |
| // Relocate the input sections and write out the local symbols. |
| void |
| do_relocate(const Symbol_table* symtab, const Layout*, Output_file* of); |
| |
| // Set the offset of a section. |
| void |
| do_set_section_offset(unsigned int shndx, uint64_t off); |
| |
| // The Incremental_binary base file. |
| Sized_incremental_binary<size, big_endian>* ibase_; |
| // The index of the object in the input file list. |
| unsigned int input_file_index_; |
| // The reader for the input file. |
| Input_entry_reader input_reader_; |
| // The number of local symbols. |
| unsigned int local_symbol_count_; |
| // The number of local symbols which go into the output file's dynamic |
| // symbol table. |
| unsigned int output_local_dynsym_count_; |
| // This starting symbol index in the output symbol table. |
| unsigned int local_symbol_index_; |
| // The file offset for local symbols in the output symbol table. |
| unsigned int local_symbol_offset_; |
| // The file offset for local symbols in the output symbol table. |
| unsigned int local_dynsym_offset_; |
| // The entries in the symbol table for the external symbols. |
| Symbols symbols_; |
| // Number of symbols defined in object file itself. |
| size_t defined_count_; |
| // The offset of the first incremental relocation for this object. |
| unsigned int incr_reloc_offset_; |
| // The number of incremental relocations for this object. |
| unsigned int incr_reloc_count_; |
| // The index of the first incremental relocation for this object in the |
| // updated output file. |
| unsigned int incr_reloc_output_index_; |
| // A copy of the incremental relocations from this object. |
| unsigned char* incr_relocs_; |
| // The local symbols. |
| std::vector<Local_symbol> local_symbols_; |
| }; |
| |
| // An incremental Dynobj. This class represents a shared object that has |
| // not changed since the last incremental link, and whose contents can be |
| // used directly from the base file. |
| |
| template<int size, bool big_endian> |
| class Sized_incr_dynobj : public Dynobj |
| { |
| public: |
| typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
| |
| static const Address invalid_address = static_cast<Address>(0) - 1; |
| |
| Sized_incr_dynobj(const std::string& name, |
| Sized_incremental_binary<size, big_endian>* ibase, |
| unsigned int input_file_index); |
| |
| private: |
| typedef Incremental_inputs_reader<size, big_endian> Inputs_reader; |
| typedef typename Inputs_reader::Incremental_input_entry_reader |
| Input_entry_reader; |
| |
| // Return TRUE if this is an incremental (unchanged) input file. |
| bool |
| do_is_incremental() const |
| { return true; } |
| |
| // Return the last modified time of the file. |
| Timespec |
| do_get_mtime() |
| { return this->input_reader_.get_mtime(); } |
| |
| // Read the symbols. |
| void |
| do_read_symbols(Read_symbols_data*); |
| |
| // Lay out the input sections. |
| void |
| do_layout(Symbol_table*, Layout*, Read_symbols_data*); |
| |
| // Add the symbols to the symbol table. |
| void |
| do_add_symbols(Symbol_table*, Read_symbols_data*, Layout*); |
| |
| Archive::Should_include |
| do_should_include_member(Symbol_table* symtab, Layout*, Read_symbols_data*, |
| std::string* why); |
| |
| // Iterate over global symbols, calling a visitor class V for each. |
| void |
| do_for_all_global_symbols(Read_symbols_data* sd, |
| Library_base::Symbol_visitor_base* v); |
| |
| // Iterate over local symbols, calling a visitor class V for each GOT offset |
| // associated with a local symbol. |
| void |
| do_for_all_local_got_entries(Got_offset_list::Visitor* v) const; |
| |
| // Get the size of a section. |
| uint64_t |
| do_section_size(unsigned int shndx); |
| |
| // Get the name of a section. |
| std::string |
| do_section_name(unsigned int shndx) const; |
| |
| // Return a view of the contents of a section. |
| const unsigned char* |
| do_section_contents(unsigned int shndx, section_size_type* plen, |
| bool cache); |
| |
| // Return section flags. |
| uint64_t |
| do_section_flags(unsigned int shndx); |
| |
| // Return section entsize. |
| uint64_t |
| do_section_entsize(unsigned int shndx); |
| |
| // Return section address. |
| uint64_t |
| do_section_address(unsigned int shndx); |
| |
| // Return section type. |
| unsigned int |
| do_section_type(unsigned int shndx); |
| |
| // Return the section link field. |
| unsigned int |
| do_section_link(unsigned int shndx); |
| |
| // Return the section link field. |
| unsigned int |
| do_section_info(unsigned int shndx); |
| |
| // Return the section alignment. |
| uint64_t |
| do_section_addralign(unsigned int shndx); |
| |
| // Return the Xindex structure to use. |
| Xindex* |
| do_initialize_xindex(); |
| |
| // Get symbol counts. |
| void |
| do_get_global_symbol_counts(const Symbol_table*, size_t*, size_t*) const; |
| |
| // Get global symbols. |
| const Symbols* |
| do_get_global_symbols() const |
| { return &this->symbols_; } |
| |
| // The Incremental_binary base file. |
| Sized_incremental_binary<size, big_endian>* ibase_; |
| // The index of the object in the input file list. |
| unsigned int input_file_index_; |
| // The reader for the input file. |
| Input_entry_reader input_reader_; |
| // The entries in the symbol table for the external symbols. |
| Symbols symbols_; |
| // Number of symbols defined in object file itself. |
| size_t defined_count_; |
| }; |
| |
| // Allocate an incremental object of the appropriate size and endianness. |
| extern Object* |
| make_sized_incremental_object( |
| Incremental_binary* base, |
| unsigned int input_file_index, |
| Incremental_input_type input_type, |
| const Incremental_binary::Input_reader* input_reader); |
| |
| // This class represents an Archive library (or --start-lib/--end-lib group) |
| // that has not changed since the last incremental link. Its contents come |
| // from the incremental inputs entry in the base file. |
| |
| class Incremental_library : public Library_base |
| { |
| public: |
| Incremental_library(const char* filename, unsigned int input_file_index, |
| const Incremental_binary::Input_reader* input_reader) |
| : Library_base(NULL), filename_(filename), |
| input_file_index_(input_file_index), input_reader_(input_reader), |
| unused_symbols_(), is_reported_(false) |
| { } |
| |
| // Return the input file index. |
| unsigned int |
| input_file_index() const |
| { return this->input_file_index_; } |
| |
| // Return the serial number of the input file. |
| unsigned int |
| arg_serial() const |
| { return this->input_reader_->arg_serial(); } |
| |
| // Copy the unused symbols from the incremental input info. |
| // We need to do this because we may be overwriting the incremental |
| // input info in the base file before we write the new incremental |
| // info. |
| void |
| copy_unused_symbols(); |
| |
| // Return FALSE on the first call to indicate that the library needs |
| // to be recorded; return TRUE subsequently. |
| bool |
| is_reported() |
| { |
| bool was_reported = this->is_reported_; |
| is_reported_ = true; |
| return was_reported; |
| } |
| |
| private: |
| typedef std::vector<std::string> Symbol_list; |
| |
| // The file name. |
| const std::string& |
| do_filename() const |
| { return this->filename_; } |
| |
| // Return the modification time of the archive file. |
| Timespec |
| do_get_mtime() |
| { return this->input_reader_->get_mtime(); } |
| |
| // Iterator for unused global symbols in the library. |
| void |
| do_for_all_unused_symbols(Symbol_visitor_base* v) const; |
| |
| // The name of the library. |
| std::string filename_; |
| // The input file index of this library. |
| unsigned int input_file_index_; |
| // A reader for the incremental input information. |
| const Incremental_binary::Input_reader* input_reader_; |
| // List of unused symbols defined in this library. |
| Symbol_list unused_symbols_; |
| // TRUE when this library has been reported to the new incremental info. |
| bool is_reported_; |
| }; |
| |
| } // End namespace gold. |
| |
| #endif // !defined(GOLD_INCREMENTAL_H) |