| // inremental.cc -- incremental linking support for gold |
| |
| // Copyright 2009 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. |
| |
| #include "gold.h" |
| #include "elfcpp.h" |
| #include "output.h" |
| #include "incremental.h" |
| #include "archive.h" |
| |
| using elfcpp::Convert; |
| |
| namespace gold { |
| |
| // Version information. Will change frequently during the development, later |
| // we could think about backward (and forward?) compatibility. |
| const int INCREMENTAL_LINK_VERSION = 1; |
| |
| namespace internal { |
| |
| // Header of the .gnu_incremental_input section. |
| struct Incremental_inputs_header_data |
| { |
| // Incremental linker version. |
| elfcpp::Elf_Word version; |
| |
| // Numer of input files in the link. |
| elfcpp::Elf_Word input_file_count; |
| |
| // Offset of command line options in .gnu_incremental_strtab. |
| elfcpp::Elf_Word command_line_offset; |
| |
| // Padding. |
| elfcpp::Elf_Word reserved; |
| }; |
| |
| // Data stored in .gnu_incremental_input after the header for each of the |
| // Incremental_input_header_data::input_file_count input entries. |
| struct Incremental_inputs_entry_data |
| { |
| // Offset of file name in .gnu_incremental_strtab section. |
| elfcpp::Elf_Word filename_offset; |
| |
| // Offset of data in .gnu_incremental_input. |
| elfcpp::Elf_Word data_offset; |
| |
| // Timestamp (in seconds). |
| elfcpp::Elf_Xword timestamp_sec; |
| |
| // Nano-second part of timestamp (if supported). |
| elfcpp::Elf_Word timestamp_nsec; |
| |
| // Type of the input entry. |
| elfcpp::Elf_Half input_type; |
| |
| // Padding. |
| elfcpp::Elf_Half reserved; |
| }; |
| |
| } |
| |
| // Accessors. |
| |
| // See internal::Incremental_input_header for fields descriptions. |
| template<int size, bool big_endian> |
| class Incremental_inputs_header_write |
| { |
| public: |
| Incremental_inputs_header_write(unsigned char *p) |
| : p_(reinterpret_cast<internal::Incremental_inputs_header_data*>(p)) |
| { } |
| |
| static const int data_size = sizeof(internal::Incremental_inputs_header_data); |
| |
| void |
| put_version(elfcpp::Elf_Word v) |
| { this->p_->version = Convert<32, big_endian>::convert_host(v); } |
| |
| void |
| put_input_file_count(elfcpp::Elf_Word v) |
| { this->p_->input_file_count = Convert<32, big_endian>::convert_host(v); } |
| |
| void |
| put_command_line_offset(elfcpp::Elf_Word v) |
| { this->p_->command_line_offset = Convert<32, big_endian>::convert_host(v); } |
| |
| void |
| put_reserved(elfcpp::Elf_Word v) |
| { this->p_->reserved = Convert<32, big_endian>::convert_host(v); } |
| |
| private: |
| internal::Incremental_inputs_header_data* p_; |
| }; |
| |
| // See internal::Incremental_input_entry for fields descriptions. |
| template<int size, bool big_endian> |
| class Incremental_inputs_entry_write |
| { |
| public: |
| Incremental_inputs_entry_write(unsigned char *p) |
| : p_(reinterpret_cast<internal::Incremental_inputs_entry_data*>(p)) |
| { } |
| |
| static const int data_size = sizeof(internal::Incremental_inputs_entry_data); |
| |
| void |
| put_filename_offset(elfcpp::Elf_Word v) |
| { this->p_->filename_offset = Convert<32, big_endian>::convert_host(v); } |
| |
| void |
| put_data_offset(elfcpp::Elf_Word v) |
| { this->p_->data_offset = Convert<32, big_endian>::convert_host(v); } |
| |
| void |
| put_timestamp_sec(elfcpp::Elf_Xword v) |
| { this->p_->timestamp_sec = Convert<64, big_endian>::convert_host(v); } |
| |
| void |
| put_timestamp_nsec(elfcpp::Elf_Word v) |
| { this->p_->timestamp_nsec = Convert<32, big_endian>::convert_host(v); } |
| |
| void |
| put_input_type(elfcpp::Elf_Word v) |
| { this->p_->input_type = Convert<32, big_endian>::convert_host(v); } |
| |
| void |
| put_reserved(elfcpp::Elf_Word v) |
| { this->p_->reserved = Convert<32, big_endian>::convert_host(v); } |
| |
| private: |
| internal::Incremental_inputs_entry_data* p_; |
| }; |
| |
| // Add the command line to the string table, setting |
| // command_line_key_. In incremental builds, the command line is |
| // stored in .gnu_incremental_inputs so that the next linker run can |
| // check if the command line options didn't change. |
| |
| void |
| Incremental_inputs::report_command_line(int argc, const char* const* argv) |
| { |
| // Always store 'gold' as argv[0] to avoid a full relink if the user used a |
| // different path to the linker. |
| std::string args("gold"); |
| // Copied from collect_argv in main.cc. |
| for (int i = 1; i < argc; ++i) |
| { |
| // Adding/removing these options should result in a full relink. |
| if (strcmp(argv[i], "--incremental-changed") == 0 |
| || strcmp(argv[i], "--incremental-unchanged") == 0 |
| || strcmp(argv[i], "--incremental-unknown") == 0) |
| continue; |
| |
| args.append(" '"); |
| // Now append argv[i], but with all single-quotes escaped |
| const char* argpos = argv[i]; |
| while (1) |
| { |
| const int len = strcspn(argpos, "'"); |
| args.append(argpos, len); |
| if (argpos[len] == '\0') |
| break; |
| args.append("'\"'\"'"); |
| argpos += len + 1; |
| } |
| args.append("'"); |
| } |
| this->strtab_->add(args.c_str(), true, &this->command_line_key_); |
| } |
| |
| // Record that the input argument INPUT is an achive ARCHIVE. This is |
| // called by Read_symbols after finding out the type of the file. |
| |
| void |
| Incremental_inputs::report_archive(const Input_argument* input, |
| Archive* archive) |
| { |
| Hold_lock hl(*this->lock_); |
| |
| Input_info info; |
| info.type = INCREMENTAL_INPUT_ARCHIVE; |
| info.archive = archive; |
| info.mtime = archive->file().get_mtime(); |
| this->inputs_map_.insert(std::make_pair(input, info)); |
| } |
| |
| // Record that the input argument INPUT is an object OBJ. This is |
| // called by Read_symbols after finding out the type of the file. |
| |
| void |
| Incremental_inputs::report_object(const Input_argument* input, |
| Object* obj) |
| { |
| Hold_lock hl(*this->lock_); |
| |
| Input_info info; |
| info.type = (obj->is_dynamic() |
| ? INCREMENTAL_INPUT_SHARED_LIBRARY |
| : INCREMENTAL_INPUT_OBJECT); |
| info.object = obj; |
| info.mtime = obj->input_file()->file().get_mtime(); |
| this->inputs_map_.insert(std::make_pair(input, info)); |
| } |
| |
| // Record that the input argument INPUT is an script SCRIPT. This is |
| // called by read_script after parsing the script and reading the list |
| // of inputs added by this script. |
| |
| void |
| Incremental_inputs::report_script(const Input_argument* input, |
| Timespec mtime, |
| Script_info* script) |
| { |
| Hold_lock hl(*this->lock_); |
| |
| Input_info info; |
| info.type = INCREMENTAL_INPUT_SCRIPT; |
| info.script = script; |
| info.mtime = mtime; |
| this->inputs_map_.insert(std::make_pair(input, info)); |
| } |
| |
| // Compute indexes in the order in which the inputs should appear in |
| // .gnu_incremental_inputs. This needs to be done after all the |
| // scripts are parsed. The function is first called for the command |
| // line inputs arguments and may call itself recursively for e.g. a |
| // list of elements of a group or a list of inputs added by a script. |
| // The [BEGIN; END) interval to analyze and *INDEX is the current |
| // value of the index (that will be updated). |
| |
| void |
| Incremental_inputs::finalize_inputs( |
| Input_argument_list::const_iterator begin, |
| Input_argument_list::const_iterator end, |
| unsigned int* index) |
| { |
| for (Input_argument_list::const_iterator p = begin; p != end; ++p) |
| { |
| if (p->is_group()) |
| { |
| finalize_inputs(p->group()->begin(), p->group()->end(), index); |
| continue; |
| } |
| |
| Inputs_info_map::iterator it = this->inputs_map_.find(&(*p)); |
| // TODO: turn it into an assert when the code will be more stable. |
| if (it == this->inputs_map_.end()) |
| { |
| gold_error("internal error: %s: incremental build info not provided", |
| (p->is_file() ? p->file().name() : "[group]")); |
| continue; |
| } |
| Input_info* info = &it->second; |
| info->index = *index; |
| (*index)++; |
| this->strtab_->add(p->file().name(), false, &info->filename_key); |
| if (info->type == INCREMENTAL_INPUT_SCRIPT) |
| { |
| finalize_inputs(info->script->inputs()->begin(), |
| info->script->inputs()->end(), |
| index); |
| } |
| } |
| } |
| |
| // Finalize the incremental link information. Called from |
| // Layout::finalize. |
| |
| void |
| Incremental_inputs::finalize() |
| { |
| unsigned int index = 0; |
| finalize_inputs(this->inputs_->begin(), this->inputs_->end(), &index); |
| |
| // Sanity check. |
| for (Inputs_info_map::const_iterator p = this->inputs_map_.begin(); |
| p != this->inputs_map_.end(); |
| ++p) |
| { |
| gold_assert(p->second.filename_key != 0); |
| } |
| |
| this->strtab_->set_string_offsets(); |
| } |
| |
| // Create the content of the .gnu_incremental_inputs section. |
| |
| Output_section_data* |
| Incremental_inputs::create_incremental_inputs_section_data() |
| { |
| switch (parameters->size_and_endianness()) |
| { |
| #ifdef HAVE_TARGET_32_LITTLE |
| case Parameters::TARGET_32_LITTLE: |
| return this->sized_create_inputs_section_data<32, false>(); |
| #endif |
| #ifdef HAVE_TARGET_32_BIG |
| case Parameters::TARGET_32_BIG: |
| return this->sized_create_inputs_section_data<32, true>(); |
| #endif |
| #ifdef HAVE_TARGET_64_LITTLE |
| case Parameters::TARGET_64_LITTLE: |
| return this->sized_create_inputs_section_data<64, false>(); |
| #endif |
| #ifdef HAVE_TARGET_64_BIG |
| case Parameters::TARGET_64_BIG: |
| return this->sized_create_inputs_section_data<64, true>(); |
| #endif |
| default: |
| gold_unreachable(); |
| } |
| } |
| |
| // Sized creation of .gnu_incremental_inputs section. |
| |
| template<int size, bool big_endian> |
| Output_section_data* |
| Incremental_inputs::sized_create_inputs_section_data() |
| { |
| const int entry_size = |
| Incremental_inputs_entry_write<size, big_endian>::data_size; |
| const int header_size = |
| Incremental_inputs_header_write<size, big_endian>::data_size; |
| |
| unsigned int sz = header_size + entry_size * this->inputs_map_.size(); |
| unsigned char* buffer = new unsigned char[sz]; |
| unsigned char* inputs_base = buffer + header_size; |
| |
| Incremental_inputs_header_write<size, big_endian> header_writer(buffer); |
| gold_assert(this->command_line_key_ > 0); |
| int cmd_offset = this->strtab_->get_offset_from_key(this->command_line_key_); |
| |
| header_writer.put_version(INCREMENTAL_LINK_VERSION); |
| header_writer.put_input_file_count(this->inputs_map_.size()); |
| header_writer.put_command_line_offset(cmd_offset); |
| header_writer.put_reserved(0); |
| |
| for (Inputs_info_map::const_iterator it = this->inputs_map_.begin(); |
| it != this->inputs_map_.end(); |
| ++it) |
| { |
| gold_assert(it->second.index < this->inputs_map_.size()); |
| |
| unsigned char* entry_buffer = |
| inputs_base + it->second.index * entry_size; |
| Incremental_inputs_entry_write<size, big_endian> entry(entry_buffer); |
| int filename_offset = |
| this->strtab_->get_offset_from_key(it->second.filename_key); |
| entry.put_filename_offset(filename_offset); |
| // TODO: add per input data and timestamp. Currently we store |
| // an out-of-bounds offset for future version of gold to reject |
| // such an incremental_inputs section. |
| entry.put_data_offset(0xffffffff); |
| entry.put_timestamp_sec(it->second.mtime.seconds); |
| entry.put_timestamp_nsec(it->second.mtime.nanoseconds); |
| entry.put_input_type(it->second.type); |
| entry.put_reserved(0); |
| } |
| |
| return new Output_data_const_buffer(buffer, sz, 8, |
| "** incremental link inputs list"); |
| } |
| |
| } // End namespace gold. |