| // incremental.cc -- incremental linking test/debug tool |
| |
| // Copyright (C) 2009-2021 Free Software Foundation, Inc. |
| // Written by Rafael Avila de Espindola <rafael.espindola@gmail.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. |
| |
| |
| // This file is a (still incomplete) test/debug tool that should display |
| // all information available in the incremental linking sections in a |
| // format that is easy to read. |
| // Once the format is a bit more stable, this should probably be moved to |
| // readelf. Because of that, the use of gold's data structures and functions |
| // is just a short term convenience and not a design decision. |
| |
| #include "gold.h" |
| |
| #include <stdio.h> |
| #include <errno.h> |
| #include <time.h> |
| |
| #include "incremental.h" |
| |
| namespace gold |
| { |
| class Output_file; |
| } |
| |
| using namespace gold; |
| |
| template<int size, bool big_endian> |
| static typename Incremental_inputs_reader<size, big_endian>:: |
| Incremental_input_entry_reader |
| find_input_containing_global( |
| Incremental_inputs_reader<size, big_endian>& incremental_inputs, |
| unsigned int offset, |
| unsigned int* symndx) |
| { |
| typedef Incremental_inputs_reader<size, big_endian> Inputs_reader; |
| static const unsigned int global_sym_entry_size = |
| Incremental_inputs_reader<size, big_endian>::global_sym_entry_size; |
| |
| for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i) |
| { |
| typename Inputs_reader::Incremental_input_entry_reader input_file = |
| incremental_inputs.input_file(i); |
| if (input_file.type() != INCREMENTAL_INPUT_OBJECT |
| && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER) |
| continue; |
| unsigned int nsyms = input_file.get_global_symbol_count(); |
| if (offset >= input_file.get_symbol_offset(0) |
| && offset < input_file.get_symbol_offset(nsyms)) |
| { |
| *symndx = ((offset - input_file.get_symbol_offset(0)) |
| / global_sym_entry_size); |
| return input_file; |
| } |
| } |
| gold_unreachable(); |
| } |
| |
| template<int size, bool big_endian> |
| static void |
| dump_incremental_inputs(const char* argv0, const char* filename, |
| Sized_incremental_binary<size, big_endian>* inc) |
| { |
| typedef Incremental_binary::Location Location; |
| typedef Incremental_binary::View View; |
| typedef Incremental_inputs_reader<size, big_endian> Inputs_reader; |
| typedef typename Inputs_reader::Incremental_input_entry_reader Entry_reader; |
| |
| if (!inc->has_incremental_info()) |
| { |
| fprintf(stderr, "%s: %s: no .gnu_incremental_inputs section\n", argv0, |
| filename); |
| exit(1); |
| } |
| |
| // Create a reader object for the .gnu_incremental_inputs section. |
| |
| Incremental_inputs_reader<size, big_endian> |
| incremental_inputs(inc->inputs_reader()); |
| |
| if (incremental_inputs.version() != 2) |
| { |
| fprintf(stderr, "%s: %s: unknown incremental version %d\n", argv0, |
| filename, incremental_inputs.version()); |
| exit(1); |
| } |
| |
| const char* command_line = incremental_inputs.command_line(); |
| if (command_line == NULL) |
| { |
| fprintf(stderr, |
| "%s: %s: failed to get link command line\n", |
| argv0, filename); |
| exit(1); |
| } |
| printf("Link command line: %s\n", command_line); |
| |
| printf("\nInput files:\n"); |
| for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i) |
| { |
| Entry_reader input_file = incremental_inputs.input_file(i); |
| |
| const char* objname = input_file.filename(); |
| if (objname == NULL) |
| { |
| fprintf(stderr,"%s: %s: failed to get file name for object %u\n", |
| argv0, filename, i); |
| exit(1); |
| } |
| printf("[%d] %s\n", i, objname); |
| |
| Timespec mtime = input_file.get_mtime(); |
| printf(" Timestamp: %llu.%09d %s", |
| static_cast<unsigned long long>(mtime.seconds), |
| mtime.nanoseconds, |
| ctime(&mtime.seconds)); |
| |
| printf(" Serial Number: %d\n", input_file.arg_serial()); |
| printf(" In System Directory: %s\n", |
| input_file.is_in_system_directory() ? "true" : "false"); |
| |
| Incremental_input_type input_type = input_file.type(); |
| printf(" Type: "); |
| switch (input_type) |
| { |
| case INCREMENTAL_INPUT_OBJECT: |
| case INCREMENTAL_INPUT_ARCHIVE_MEMBER: |
| printf("%s\n", (input_type == INCREMENTAL_INPUT_OBJECT |
| ? "Object" : "Archive member")); |
| printf(" Input section count: %d\n", |
| input_file.get_input_section_count()); |
| printf(" Global symbol count: %d\n", |
| input_file.get_global_symbol_count()); |
| printf(" Local symbol offset: %d\n", |
| input_file.get_local_symbol_offset()); |
| printf(" Local symbol count: %d\n", |
| input_file.get_local_symbol_count()); |
| printf(" First dynamic reloc: %d\n", |
| input_file.get_first_dyn_reloc()); |
| printf(" Dynamic reloc count: %d\n", |
| input_file.get_dyn_reloc_count()); |
| printf(" COMDAT group count: %d\n", |
| input_file.get_comdat_group_count()); |
| break; |
| case INCREMENTAL_INPUT_ARCHIVE: |
| printf("Archive\n"); |
| printf(" Member count: %d\n", input_file.get_member_count()); |
| printf(" Unused symbol count: %d\n", |
| input_file.get_unused_symbol_count()); |
| break; |
| case INCREMENTAL_INPUT_SHARED_LIBRARY: |
| printf("Shared library\n"); |
| printf(" As needed: %s\n", |
| input_file.as_needed() ? "true" : "false"); |
| printf(" soname: %s\n", |
| input_file.get_soname()); |
| printf(" Symbol count: %d\n", |
| input_file.get_global_symbol_count()); |
| break; |
| case INCREMENTAL_INPUT_SCRIPT: |
| printf("Linker script\n"); |
| printf(" Object count: %d\n", input_file.get_object_count()); |
| break; |
| default: |
| fprintf(stderr, "%s: invalid file type for object %u: %d\n", |
| argv0, i, input_type); |
| exit(1); |
| } |
| } |
| |
| printf("\nInput sections:\n"); |
| for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i) |
| { |
| Entry_reader input_file(incremental_inputs.input_file(i)); |
| |
| if (input_file.type() != INCREMENTAL_INPUT_OBJECT |
| && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER) |
| continue; |
| |
| const char* objname = input_file.filename(); |
| if (objname == NULL) |
| { |
| fprintf(stderr,"%s: %s: failed to get file name for object %u\n", |
| argv0, filename, i); |
| exit(1); |
| } |
| |
| printf("[%d] %s\n", i, objname); |
| |
| printf(" %3s %6s %8s %8s %s\n", |
| "n", "outndx", "offset", "size", "name"); |
| unsigned int nsections = input_file.get_input_section_count(); |
| for (unsigned int shndx = 0; shndx < nsections; ++shndx) |
| { |
| typename Entry_reader::Input_section_info info( |
| input_file.get_input_section(shndx)); |
| printf(" %3d %6d %8lld %8lld %s\n", shndx + 1, |
| info.output_shndx, |
| static_cast<long long>(info.sh_offset), |
| static_cast<long long>(info.sh_size), |
| info.name); |
| } |
| |
| unsigned int ncomdat = input_file.get_comdat_group_count(); |
| for (unsigned int i = 0; i < ncomdat; ++i) |
| printf(" Comdat group: %s\n", |
| input_file.get_comdat_group_signature(i)); |
| } |
| |
| // Get a view of the .symtab section. |
| |
| elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file(inc); |
| |
| unsigned int symtab_shndx = elf_file.find_section_by_type(elfcpp::SHT_SYMTAB); |
| if (symtab_shndx == elfcpp::SHN_UNDEF) // Not found. |
| { |
| fprintf(stderr, "%s: %s: no symbol table section\n", argv0, filename); |
| exit(1); |
| } |
| Location symtab_location(elf_file.section_contents(symtab_shndx)); |
| View symtab_view(inc->view(symtab_location)); |
| |
| // Get a view of the .strtab section. |
| |
| unsigned int strtab_shndx = elf_file.section_link(symtab_shndx); |
| if (strtab_shndx == elfcpp::SHN_UNDEF |
| || strtab_shndx > elf_file.shnum() |
| || elf_file.section_type(strtab_shndx) != elfcpp::SHT_STRTAB) |
| { |
| fprintf(stderr, "%s: %s: no string table section\n", argv0, filename); |
| exit(1); |
| } |
| Location strtab_location(elf_file.section_contents(strtab_shndx)); |
| View strtab_view(inc->view(strtab_location)); |
| elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size); |
| |
| // The .gnu_incremental_symtab section contains entries that parallel |
| // the global symbols of the main symbol table. The sh_info field |
| // of the main symbol table's section header tells us how many global |
| // symbols there are, but that count does not include any global |
| // symbols that were forced local during the link. Therefore, we |
| // use the size of the .gnu_incremental_symtab section to deduce |
| // the number of global symbols + forced-local symbols there are |
| // in the symbol table. |
| Incremental_symtab_reader<big_endian> isymtab(inc->symtab_reader()); |
| Incremental_relocs_reader<size, big_endian> irelocs(inc->relocs_reader()); |
| unsigned int sym_size = elfcpp::Elf_sizes<size>::sym_size; |
| unsigned int nsyms = symtab_location.data_size / sym_size; |
| unsigned int nglobals = isymtab.symbol_count(); |
| unsigned int first_global = nsyms - nglobals; |
| unsigned const char* sym_p; |
| |
| printf("\nGlobal symbols per input file:\n"); |
| for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i) |
| { |
| Entry_reader input_file(incremental_inputs.input_file(i)); |
| |
| if (input_file.type() != INCREMENTAL_INPUT_OBJECT |
| && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER |
| && input_file.type() != INCREMENTAL_INPUT_SHARED_LIBRARY) |
| continue; |
| |
| const char* objname = input_file.filename(); |
| if (objname == NULL) |
| { |
| fprintf(stderr,"%s: %s: failed to get file name for object %u\n", |
| argv0, filename, i); |
| exit(1); |
| } |
| |
| printf("[%d] %s\n", i, objname); |
| |
| unsigned int nsyms = input_file.get_global_symbol_count(); |
| if (nsyms > 0) |
| printf(" %6s %6s %8s %8s %8s %8s\n", |
| "outndx", "shndx", "offset", "chain", "#relocs", "rbase"); |
| if (input_file.type() == INCREMENTAL_INPUT_SHARED_LIBRARY) |
| { |
| for (unsigned int symndx = 0; symndx < nsyms; ++symndx) |
| { |
| bool is_def; |
| bool is_copy; |
| unsigned int output_symndx = |
| input_file.get_output_symbol_index(symndx, &is_def, &is_copy); |
| sym_p = symtab_view.data() + output_symndx * sym_size; |
| elfcpp::Sym<size, big_endian> sym(sym_p); |
| const char* symname; |
| if (!strtab.get_c_string(sym.get_st_name(), &symname)) |
| symname = "<unknown>"; |
| printf(" %6d %6s %8s %8s %8s %8s %-5s %s\n", |
| output_symndx, |
| "", "", "", "", "", |
| is_copy ? "COPY" : (is_def ? "DEF" : "UNDEF"), |
| symname); |
| } |
| } |
| else |
| { |
| for (unsigned int symndx = 0; symndx < nsyms; ++symndx) |
| { |
| Incremental_global_symbol_reader<big_endian> info( |
| input_file.get_global_symbol_reader(symndx)); |
| unsigned int output_symndx = info.output_symndx(); |
| sym_p = symtab_view.data() + output_symndx * sym_size; |
| elfcpp::Sym<size, big_endian> sym(sym_p); |
| const char* symname; |
| if (!strtab.get_c_string(sym.get_st_name(), &symname)) |
| symname = "<unknown>"; |
| printf(" %6d %6d %8d %8d %8d %8d %-5s %s\n", |
| output_symndx, |
| info.shndx() == -1U ? -1 : info.shndx(), |
| input_file.get_symbol_offset(symndx), |
| info.next_offset(), |
| info.reloc_count(), |
| info.reloc_offset(), |
| (info.shndx() == -1U |
| ? "BASE" |
| : info.shndx() == 0 ? "UNDEF" : "DEF"), |
| symname); |
| } |
| } |
| } |
| |
| sym_p = symtab_view.data() + first_global * sym_size; |
| printf("\nGlobal symbol table:\n"); |
| for (unsigned int i = 0; i < nglobals; i++) |
| { |
| elfcpp::Sym<size, big_endian> sym(sym_p); |
| const char* symname; |
| if (!strtab.get_c_string(sym.get_st_name(), &symname)) |
| symname = "<unknown>"; |
| printf("[%d] %s\n", first_global + i, symname); |
| unsigned int offset = isymtab.get_list_head(i); |
| while (offset > 0) |
| { |
| unsigned int sym_ndx; |
| Entry_reader input_file = |
| find_input_containing_global<size, big_endian>(incremental_inputs, |
| offset, &sym_ndx); |
| Incremental_global_symbol_reader<big_endian> sym_info( |
| input_file.get_global_symbol_reader(sym_ndx)); |
| printf(" %s (first reloc: %d, reloc count: %d)", |
| input_file.filename(), sym_info.reloc_offset(), |
| sym_info.reloc_count()); |
| if (sym_info.output_symndx() != first_global + i) |
| printf(" ** wrong output symndx (%d) **", sym_info.output_symndx()); |
| printf("\n"); |
| // Dump the relocations from this input file for this symbol. |
| unsigned int r_off = sym_info.reloc_offset(); |
| for (unsigned int j = 0; j < sym_info.reloc_count(); j++) |
| { |
| printf(" %4d relocation type %3d shndx %2d" |
| " offset %016llx addend %016llx %s\n", |
| r_off, |
| irelocs.get_r_type(r_off), |
| irelocs.get_r_shndx(r_off), |
| static_cast<long long>(irelocs.get_r_offset(r_off)), |
| static_cast<long long>(irelocs.get_r_addend(r_off)), |
| symname); |
| r_off += irelocs.reloc_size; |
| } |
| offset = sym_info.next_offset(); |
| } |
| sym_p += sym_size; |
| } |
| |
| Incremental_got_plt_reader<big_endian> igot_plt(inc->got_plt_reader()); |
| unsigned int ngot = igot_plt.get_got_entry_count(); |
| unsigned int nplt = igot_plt.get_plt_entry_count(); |
| |
| printf("\nGOT entries:\n"); |
| for (unsigned int i = 0; i < ngot; ++i) |
| { |
| unsigned int got_type = igot_plt.get_got_type(i); |
| unsigned int got_symndx = igot_plt.get_got_symndx(i); |
| unsigned int got_input_index = igot_plt.get_got_input_index(i); |
| printf("[%d] type %02x, ", i, got_type & 0x7f); |
| if ((got_type & 0x7f) == 0x7f) |
| printf("reserved"); |
| else if (got_type & 0x80) |
| { |
| Entry_reader input_file = |
| incremental_inputs.input_file(got_input_index); |
| const char* objname = input_file.filename(); |
| printf("local: %s (%d)", objname, got_symndx); |
| } |
| else |
| { |
| sym_p = symtab_view.data() + got_symndx * sym_size; |
| elfcpp::Sym<size, big_endian> sym(sym_p); |
| const char* symname; |
| if (!strtab.get_c_string(sym.get_st_name(), &symname)) |
| symname = "<unknown>"; |
| printf("global %s (%d)", symname, got_symndx); |
| } |
| printf("\n"); |
| } |
| |
| printf("\nPLT entries:\n"); |
| for (unsigned int i = 0; i < nplt; ++i) |
| { |
| unsigned int plt_desc = igot_plt.get_plt_desc(i); |
| printf("[%d] ", i); |
| sym_p = symtab_view.data() + plt_desc * sym_size; |
| elfcpp::Sym<size, big_endian> sym(sym_p); |
| const char* symname; |
| if (!strtab.get_c_string(sym.get_st_name(), &symname)) |
| symname = "<unknown>"; |
| printf("%s (%d)\n", symname, plt_desc); |
| } |
| |
| printf("\nUnused archive symbols:\n"); |
| for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i) |
| { |
| Entry_reader input_file(incremental_inputs.input_file(i)); |
| |
| if (input_file.type() != INCREMENTAL_INPUT_ARCHIVE) |
| continue; |
| |
| const char* objname = input_file.filename(); |
| if (objname == NULL) |
| { |
| fprintf(stderr,"%s: %s: failed to get file name for object %u\n", |
| argv0, filename, i); |
| exit(1); |
| } |
| |
| printf("[%d] %s\n", i, objname); |
| unsigned int nsyms = input_file.get_unused_symbol_count(); |
| for (unsigned int symndx = 0; symndx < nsyms; ++symndx) |
| printf(" %s\n", input_file.get_unused_symbol(symndx)); |
| } |
| |
| } |
| |
| int |
| main(int argc, char** argv) |
| { |
| if (argc != 2) |
| { |
| fprintf(stderr, "Usage: %s <file>\n", argv[0]); |
| return 1; |
| } |
| const char* filename = argv[1]; |
| |
| Output_file* file = new Output_file(filename); |
| |
| bool t = file->open_base_file(NULL, false); |
| if (!t) |
| { |
| fprintf(stderr, "%s: open_base_file(%s): %s\n", argv[0], filename, |
| strerror(errno)); |
| return 1; |
| } |
| |
| Incremental_binary* inc = open_incremental_binary(file); |
| |
| if (inc == NULL) |
| { |
| fprintf(stderr, "%s: open_incremental_binary(%s): %s\n", argv[0], |
| filename, strerror(errno)); |
| return 1; |
| } |
| |
| switch (parameters->size_and_endianness()) |
| { |
| #ifdef HAVE_TARGET_32_LITTLE |
| case Parameters::TARGET_32_LITTLE: |
| dump_incremental_inputs<32, false>( |
| argv[0], filename, |
| static_cast<Sized_incremental_binary<32, false>*>(inc)); |
| break; |
| #endif |
| #ifdef HAVE_TARGET_32_BIG |
| case Parameters::TARGET_32_BIG: |
| dump_incremental_inputs<32, true>( |
| argv[0], filename, |
| static_cast<Sized_incremental_binary<32, true>*>(inc)); |
| break; |
| #endif |
| #ifdef HAVE_TARGET_64_LITTLE |
| case Parameters::TARGET_64_LITTLE: |
| dump_incremental_inputs<64, false>( |
| argv[0], filename, |
| static_cast<Sized_incremental_binary<64, false>*>(inc)); |
| break; |
| #endif |
| #ifdef HAVE_TARGET_64_BIG |
| case Parameters::TARGET_64_BIG: |
| dump_incremental_inputs<64, true>( |
| argv[0], filename, |
| static_cast<Sized_incremental_binary<64, true>*>(inc)); |
| break; |
| #endif |
| default: |
| gold_unreachable(); |
| } |
| |
| return 0; |
| } |