| // inremental.h -- incremental linking support for gold -*- C++ -*- |
| |
| // Copyright 2009, 2010 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" |
| |
| namespace gold |
| { |
| |
| class Archive; |
| class Input_argument; |
| class Incremental_inputs_checker; |
| class Incremental_script_entry; |
| class Incremental_object_entry; |
| class Incremental_archive_entry; |
| class Incremental_inputs; |
| 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 |
| }; |
| |
| // An object representing the ELF file we edit during an incremental build. |
| // Similar to Object or Dynobj, but operates on Output_file and contains |
| // method specific to file edition (TBD). 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) |
| : output_(output), target_(target) |
| { } |
| |
| virtual |
| ~Incremental_binary() |
| { } |
| |
| // 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)); } |
| |
| // Report an error. |
| void |
| error(const char* format, ...) const ATTRIBUTE_PRINTF_2; |
| |
| // Find the .gnu_incremental_inputs and related sections. It selects the |
| // first section of type SHT_GNU_INCREMENTAL_INPUTS, |
| // SHT_GNU_INCRMENTAL_SYMTAB, and SHT_GNU_INCREMENTAL_RELOCS. |
| // Returns false if the sections are not found. |
| 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) |
| { |
| return do_find_incremental_inputs_sections(p_inputs_shndx, p_symtab_shndx, |
| p_relocs_shndx, p_got_plt_shndx, |
| p_strtab_shndx); |
| } |
| |
| // Check the .gnu_incremental_inputs section to see whether an incremental |
| // build is possible. |
| // TODO: on success, should report what files needs to be rebuilt. |
| // INCREMENTAL_INPUTS is used to read the canonical form of the command line |
| // and read the input arguments. TODO: for items that don't need to be |
| // rebuilt, we should also copy the incremental input information. |
| virtual bool |
| check_inputs(Incremental_inputs* incremental_inputs) |
| { return do_check_inputs(incremental_inputs); } |
| |
| protected: |
| // Find incremental inputs section. |
| virtual bool |
| do_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) = 0; |
| |
| // Check the .gnu_incremental_inputs section to see whether an incremental |
| // build is possible. |
| virtual bool |
| do_check_inputs(Incremental_inputs* incremental_inputs) = 0; |
| |
| private: |
| // Edited output file object. |
| Output_file* output_; |
| // Target of the output file. |
| Target* target_; |
| }; |
| |
| 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) |
| { } |
| |
| protected: |
| virtual bool |
| do_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); |
| |
| virtual bool |
| do_check_inputs(Incremental_inputs* incremental_inputs); |
| |
| private: |
| // Output as an ELF file. |
| elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file_; |
| }; |
| |
| // 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); |
| |
| // Code invoked early during an incremental link that checks what files need |
| // to be relinked. |
| |
| class Incremental_checker |
| { |
| public: |
| // Check if the file named OUTPUT_NAME can be linked incrementally. |
| // INCREMENTAL_INPUTS must have the canonical form of the command line |
| // and input arguments filled - at this point of linking other fields are |
| // probably not filled yet. TODO: for inputs that don't need to be |
| // rebuilt, this function should fill the incremental input information. |
| Incremental_checker(const char* output_name, |
| Incremental_inputs* incremental_inputs) |
| : output_name_(output_name), incremental_inputs_(incremental_inputs) |
| { } |
| |
| // Analyzes the output file to check if incremental linking is possible and |
| // what files needs to be relinked. |
| bool |
| can_incrementally_link_output_file(); |
| |
| private: |
| // Name of the output file to analyze. |
| const char* output_name_; |
| |
| // The Incremental_inputs object. At this stage of link, only the command |
| // line and inputs are filled. |
| Incremental_inputs* incremental_inputs_; |
| }; |
| |
| // Base class for recording each input file. |
| |
| class Incremental_input_entry |
| { |
| public: |
| Incremental_input_entry(Stringpool::Key filename_key, Timespec mtime) |
| : filename_key_(filename_key), offset_(0), info_offset_(0), mtime_(mtime) |
| { } |
| |
| virtual |
| ~Incremental_input_entry() |
| { } |
| |
| // Return the type of input file. |
| Incremental_input_type |
| type() const |
| { return this->do_type(); } |
| |
| // Set the section offset of this input file entry. |
| void |
| set_offset(unsigned int offset) |
| { 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 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 modification time of the input file. |
| const Timespec& |
| get_mtime() const |
| { return this->mtime_; } |
| |
| // 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_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_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_; |
| |
| // Offset of the entry in the output section. |
| unsigned int offset_; |
| |
| // Offset of the extra information in the output section. |
| unsigned int info_offset_; |
| |
| // Last modification time of the file. |
| Timespec mtime_; |
| }; |
| |
| // Class for recording input scripts. |
| |
| class Incremental_script_entry : public Incremental_input_entry |
| { |
| public: |
| Incremental_script_entry(Stringpool::Key filename_key, Script_info* script, |
| Timespec mtime) |
| : Incremental_input_entry(filename_key, mtime), script_(script) |
| { } |
| |
| 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: |
| // Information about the script file. |
| Script_info* script_; |
| }; |
| |
| // Class for recording input object files. |
| |
| class Incremental_object_entry : public Incremental_input_entry |
| { |
| public: |
| Incremental_object_entry(Stringpool::Key filename_key, Object* obj, |
| Timespec mtime) |
| : Incremental_input_entry(filename_key, mtime), obj_(obj), |
| is_member_(false), sections_() |
| { |
| if (!obj_->is_dynamic()) |
| 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) |
| { |
| if (shndx >= this->sections_.size()) |
| this->sections_.resize(shndx + 1); |
| this->sections_[shndx].name_key = name_key; |
| this->sections_[shndx].sh_size = sh_size; |
| } |
| |
| // Return the number of input sections in this object. |
| unsigned int |
| get_input_section_count() const |
| { return this->sections_.size(); } |
| |
| // 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; } |
| |
| protected: |
| virtual Incremental_input_type |
| do_type() const |
| { |
| return (this->is_member_ |
| ? INCREMENTAL_INPUT_ARCHIVE_MEMBER |
| : (this->obj_->is_dynamic() |
| ? INCREMENTAL_INPUT_SHARED_LIBRARY |
| : 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 |
| { |
| Stringpool::Key name_key; |
| off_t sh_size; |
| }; |
| std::vector<Input_section> sections_; |
| }; |
| |
| // Class for recording archive library input files. |
| |
| class Incremental_archive_entry : public Incremental_input_entry |
| { |
| public: |
| Incremental_archive_entry(Stringpool::Key filename_key, Archive*, |
| Timespec mtime) |
| : Incremental_input_entry(filename_key, 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(Archive* arch); |
| |
| // Record the final info for archive file ARCHIVE. |
| void |
| report_archive_end(Archive* 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, Archive* arch); |
| |
| // 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 the info for input script SCRIPT. |
| void |
| report_script(const std::string& filename, Script_info* script, |
| 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 .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: |
| Incremental_inputs_reader(const unsigned char* p, 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 |
| { |
| 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); |
| int type = Swap16::readval(this->inputs_->p_ + offset + 20); |
| this->type_ = static_cast<Incremental_input_type>(type); |
| } |
| |
| // 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 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 this->type_; } |
| |
| // 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 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_ + 8 |
| + section_count * input_section_entry_size |
| + symndx * 16); |
| } |
| |
| // Return the global symbol count -- for objects & shared libraries only. |
| unsigned int |
| get_global_symbol_count() const |
| { |
| switch (this->type_) |
| { |
| case INCREMENTAL_INPUT_OBJECT: |
| case INCREMENTAL_INPUT_ARCHIVE_MEMBER: |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_ + 4); |
| case INCREMENTAL_INPUT_SHARED_LIBRARY: |
| return Swap32::readval(this->inputs_->p_ + this->info_offset_); |
| default: |
| gold_unreachable(); |
| } |
| } |
| |
| // 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_ + 8 |
| + n * 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; |
| } |
| |
| // Information about a global symbol. |
| struct Global_symbol_info |
| { |
| unsigned int output_symndx; |
| unsigned int next_offset; |
| unsigned int reloc_count; |
| unsigned int reloc_offset; |
| }; |
| |
| // Return info about the Nth global symbol -- for objects only. |
| Global_symbol_info |
| get_global_symbol_info(unsigned int n) const |
| { |
| Global_symbol_info info; |
| unsigned int section_count = this->get_input_section_count(); |
| const unsigned char* p = (this->inputs_->p_ |
| + this->info_offset_ + 8 |
| + section_count * input_section_entry_size |
| + n * 16); |
| info.output_symndx = Swap32::readval(p); |
| info.next_offset = Swap32::readval(p + 4); |
| info.reloc_count = Swap::readval(p + 8); |
| info.reloc_offset = Swap::readval(p + 12); |
| return info; |
| } |
| |
| private: |
| // Size of an input section entry. |
| static const unsigned int input_section_entry_size = 8 + 2 * size / 8; |
| // The reader instance for the containing section. |
| const Incremental_inputs_reader* inputs_; |
| // The type of input file. |
| Incremental_input_type type_; |
| // 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 a reader for the Nth input file entry. |
| Incremental_input_entry_reader |
| input_file(unsigned int n) const |
| { |
| gold_assert(n < this->input_file_count_); |
| Incremental_input_entry_reader input(this, 16 + n * 24); |
| return input; |
| } |
| |
| 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(const unsigned char* p) : p_(p) |
| { } |
| |
| // 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_; |
| }; |
| |
| // 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(const unsigned char* p) : p_(p) |
| { } |
| |
| // 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); |
| } |
| |
| private: |
| // Base address of the .gnu_incremental_relocs section. |
| const unsigned char* p_; |
| }; |
| |
| // Reader class for the .gnu_incremental_got_plt section. |
| |
| template<bool big_endian> |
| class Incremental_got_plt_reader |
| { |
| public: |
| 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_ * 4; |
| } |
| |
| // 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 GOT descriptor for GOT entry N. |
| unsigned int |
| get_got_desc(unsigned int n) |
| { |
| return elfcpp::Swap<32, big_endian>::readval(this->got_desc_p_ + n * 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_; |
| }; |
| |
| } // End namespace gold. |
| |
| #endif // !defined(GOLD_INCREMENTAL_H) |