1 // incremental.cc -- incremental linking test/debug tool
3 // Copyright 2009, 2010 Free Software Foundation, Inc.
4 // Written by Rafael Avila de Espindola <rafael.espindola@gmail.com>
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
24 // This file is a (still incomplete) test/debug tool that should display
25 // all information available in the incremental linking sections in a
26 // format that is easy to read.
27 // Once the format is a bit more stable, this should probably be moved to
28 // readelf. Because of that, the use of gold's data structures and functions
29 // is just a short term convenience and not a design decision.
37 #include "incremental.h"
46 template<int size, bool big_endian>
47 static typename Incremental_inputs_reader<size, big_endian>::
48 Incremental_input_entry_reader
49 find_input_containing_global(
50 Incremental_inputs_reader<size, big_endian>& incremental_inputs,
54 typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
55 for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
57 typename Inputs_reader::Incremental_input_entry_reader input_file =
58 incremental_inputs.input_file(i);
59 if (input_file.type() != INCREMENTAL_INPUT_OBJECT
60 && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
62 unsigned int nsyms = input_file.get_global_symbol_count();
63 if (offset >= input_file.get_symbol_offset(0)
64 && offset < input_file.get_symbol_offset(nsyms))
66 *symndx = (offset - input_file.get_symbol_offset(0)) / 20;
73 template<int size, bool big_endian>
75 dump_incremental_inputs(const char* argv0, const char* filename,
76 Sized_incremental_binary<size, big_endian>* inc)
78 typedef Incremental_binary::Location Location;
79 typedef Incremental_binary::View View;
80 typedef Incremental_inputs_reader<size, big_endian> Inputs_reader;
81 typedef typename Inputs_reader::Incremental_input_entry_reader Entry_reader;
83 if (!inc->has_incremental_info())
85 fprintf(stderr, "%s: %s: no .gnu_incremental_inputs section\n", argv0,
90 // Create a reader object for the .gnu_incremental_inputs section.
92 Incremental_inputs_reader<size, big_endian>
93 incremental_inputs(inc->inputs_reader());
95 if (incremental_inputs.version() != 1)
97 fprintf(stderr, "%s: %s: unknown incremental version %d\n", argv0,
98 filename, incremental_inputs.version());
102 const char* command_line = incremental_inputs.command_line();
103 if (command_line == NULL)
106 "%s: %s: failed to get link command line\n",
110 printf("Link command line: %s\n", command_line);
112 printf("\nInput files:\n");
113 for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
115 Entry_reader input_file = incremental_inputs.input_file(i);
117 const char* objname = input_file.filename();
120 fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
124 printf("[%d] %s\n", i, objname);
126 Timespec mtime = input_file.get_mtime();
127 printf(" Timestamp: %llu.%09d %s",
128 static_cast<unsigned long long>(mtime.seconds),
130 ctime(&mtime.seconds));
132 printf(" Serial Number: %d\n", input_file.arg_serial());
133 printf(" In System Directory: %s\n",
134 input_file.is_in_system_directory() ? "true" : "false");
136 Incremental_input_type input_type = input_file.type();
140 case INCREMENTAL_INPUT_OBJECT:
141 case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
142 printf("%s\n", (input_type == INCREMENTAL_INPUT_OBJECT
143 ? "Object" : "Archive member"));
144 printf(" Input section count: %d\n",
145 input_file.get_input_section_count());
146 printf(" Global symbol count: %d\n",
147 input_file.get_global_symbol_count());
148 printf(" Local symbol offset: %d\n",
149 input_file.get_local_symbol_offset());
150 printf(" Local symbol count: %d\n",
151 input_file.get_local_symbol_count());
152 printf(" First dynamic reloc: %d\n",
153 input_file.get_first_dyn_reloc());
154 printf(" Dynamic reloc count: %d\n",
155 input_file.get_dyn_reloc_count());
156 printf(" COMDAT group count: %d\n",
157 input_file.get_comdat_group_count());
159 case INCREMENTAL_INPUT_ARCHIVE:
161 printf(" Member count: %d\n", input_file.get_member_count());
162 printf(" Unused symbol count: %d\n",
163 input_file.get_unused_symbol_count());
165 case INCREMENTAL_INPUT_SHARED_LIBRARY:
166 printf("Shared library\n");
167 printf(" As needed: %s\n",
168 input_file.as_needed() ? "true" : "false");
169 printf(" soname: %s\n",
170 input_file.get_soname());
171 printf(" Symbol count: %d\n",
172 input_file.get_global_symbol_count());
174 case INCREMENTAL_INPUT_SCRIPT:
175 printf("Linker script\n");
176 printf(" Object count: %d\n", input_file.get_object_count());
179 fprintf(stderr, "%s: invalid file type for object %u: %d\n",
180 argv0, i, input_type);
185 printf("\nInput sections:\n");
186 for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
188 Entry_reader input_file(incremental_inputs.input_file(i));
190 if (input_file.type() != INCREMENTAL_INPUT_OBJECT
191 && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
194 const char* objname = input_file.filename();
197 fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
202 printf("[%d] %s\n", i, objname);
204 printf(" %3s %6s %8s %8s %s\n",
205 "n", "outndx", "offset", "size", "name");
206 unsigned int nsections = input_file.get_input_section_count();
207 for (unsigned int shndx = 0; shndx < nsections; ++shndx)
209 typename Entry_reader::Input_section_info info(
210 input_file.get_input_section(shndx));
211 printf(" %3d %6d %8lld %8lld %s\n", shndx + 1,
213 static_cast<long long>(info.sh_offset),
214 static_cast<long long>(info.sh_size),
218 unsigned int ncomdat = input_file.get_comdat_group_count();
219 for (unsigned int i = 0; i < ncomdat; ++i)
220 printf(" Comdat group: %s\n",
221 input_file.get_comdat_group_signature(i));
224 // Get a view of the .symtab section.
226 elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file(inc);
228 unsigned int symtab_shndx = elf_file.find_section_by_type(elfcpp::SHT_SYMTAB);
229 if (symtab_shndx == elfcpp::SHN_UNDEF) // Not found.
231 fprintf(stderr, "%s: %s: no symbol table section\n", argv0, filename);
234 Location symtab_location(elf_file.section_contents(symtab_shndx));
235 View symtab_view(inc->view(symtab_location));
237 // Get a view of the .strtab section.
239 unsigned int strtab_shndx = elf_file.section_link(symtab_shndx);
240 if (strtab_shndx == elfcpp::SHN_UNDEF
241 || strtab_shndx > elf_file.shnum()
242 || elf_file.section_type(strtab_shndx) != elfcpp::SHT_STRTAB)
244 fprintf(stderr, "%s: %s: no string table section\n", argv0, filename);
247 Location strtab_location(elf_file.section_contents(strtab_shndx));
248 View strtab_view(inc->view(strtab_location));
249 elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size);
251 // The .gnu_incremental_symtab section contains entries that parallel
252 // the global symbols of the main symbol table. The sh_info field
253 // of the main symbol table's section header tells us how many global
254 // symbols there are, but that count does not include any global
255 // symbols that were forced local during the link. Therefore, we
256 // use the size of the .gnu_incremental_symtab section to deduce
257 // the number of global symbols + forced-local symbols there are
258 // in the symbol table.
259 Incremental_symtab_reader<big_endian> isymtab(inc->symtab_reader());
260 Incremental_relocs_reader<size, big_endian> irelocs(inc->relocs_reader());
261 unsigned int sym_size = elfcpp::Elf_sizes<size>::sym_size;
262 unsigned int nsyms = symtab_location.data_size / sym_size;
263 unsigned int nglobals = isymtab.symbol_count();
264 unsigned int first_global = nsyms - nglobals;
265 unsigned const char* sym_p;
267 printf("\nGlobal symbols per input file:\n");
268 for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
270 Entry_reader input_file(incremental_inputs.input_file(i));
272 if (input_file.type() != INCREMENTAL_INPUT_OBJECT
273 && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER
274 && input_file.type() != INCREMENTAL_INPUT_SHARED_LIBRARY)
277 const char* objname = input_file.filename();
280 fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
285 printf("[%d] %s\n", i, objname);
287 unsigned int nsyms = input_file.get_global_symbol_count();
289 printf(" %6s %6s %8s %8s %8s %8s\n",
290 "outndx", "shndx", "offset", "chain", "#relocs", "rbase");
291 if (input_file.type() == INCREMENTAL_INPUT_SHARED_LIBRARY)
293 for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
296 unsigned int output_symndx =
297 input_file.get_output_symbol_index(symndx, &is_def);
298 sym_p = symtab_view.data() + output_symndx * sym_size;
299 elfcpp::Sym<size, big_endian> sym(sym_p);
301 if (!strtab.get_c_string(sym.get_st_name(), &symname))
302 symname = "<unknown>";
303 printf(" %6d %6s %8s %8s %8s %8s %-5s %s\n",
306 is_def ? "DEF" : "UNDEF",
312 for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
314 Incremental_global_symbol_reader<big_endian> info(
315 input_file.get_global_symbol_reader(symndx));
316 unsigned int output_symndx = info.output_symndx();
317 sym_p = symtab_view.data() + output_symndx * sym_size;
318 elfcpp::Sym<size, big_endian> sym(sym_p);
320 if (!strtab.get_c_string(sym.get_st_name(), &symname))
321 symname = "<unknown>";
322 printf(" %6d %6d %8d %8d %8d %8d %-5s %s\n",
325 input_file.get_symbol_offset(symndx),
329 info.shndx() != elfcpp::SHN_UNDEF ? "DEF" : "UNDEF",
335 sym_p = symtab_view.data() + first_global * sym_size;
336 printf("\nGlobal symbol table:\n");
337 for (unsigned int i = 0; i < nglobals; i++)
339 elfcpp::Sym<size, big_endian> sym(sym_p);
341 if (!strtab.get_c_string(sym.get_st_name(), &symname))
342 symname = "<unknown>";
343 printf("[%d] %s\n", first_global + i, symname);
344 unsigned int offset = isymtab.get_list_head(i);
347 unsigned int sym_ndx;
348 Entry_reader input_file =
349 find_input_containing_global<size, big_endian>(incremental_inputs,
351 Incremental_global_symbol_reader<big_endian> sym_info(
352 input_file.get_global_symbol_reader(sym_ndx));
353 printf(" %s (first reloc: %d, reloc count: %d)",
354 input_file.filename(), sym_info.reloc_offset(),
355 sym_info.reloc_count());
356 if (sym_info.output_symndx() != first_global + i)
357 printf(" ** wrong output symndx (%d) **", sym_info.output_symndx());
359 // Dump the relocations from this input file for this symbol.
360 unsigned int r_off = sym_info.reloc_offset();
361 for (unsigned int j = 0; j < sym_info.reloc_count(); j++)
363 printf(" %4d relocation type %3d shndx %2d"
364 " offset %016llx addend %016llx %s\n",
366 irelocs.get_r_type(r_off),
367 irelocs.get_r_shndx(r_off),
368 static_cast<long long>(irelocs.get_r_offset(r_off)),
369 static_cast<long long>(irelocs.get_r_addend(r_off)),
371 r_off += irelocs.reloc_size;
373 offset = sym_info.next_offset();
378 Incremental_got_plt_reader<big_endian> igot_plt(inc->got_plt_reader());
379 unsigned int ngot = igot_plt.get_got_entry_count();
380 unsigned int nplt = igot_plt.get_plt_entry_count();
382 printf("\nGOT entries:\n");
383 for (unsigned int i = 0; i < ngot; ++i)
385 unsigned int got_type = igot_plt.get_got_type(i);
386 unsigned int got_symndx = igot_plt.get_got_symndx(i);
387 unsigned int got_input_index = igot_plt.get_got_input_index(i);
388 printf("[%d] type %02x, ", i, got_type & 0x7f);
389 if ((got_type & 0x7f) == 0x7f)
391 else if (got_type & 0x80)
393 Entry_reader input_file =
394 incremental_inputs.input_file(got_input_index);
395 const char* objname = input_file.filename();
396 printf("local: %s (%d)", objname, got_symndx);
400 sym_p = symtab_view.data() + got_symndx * sym_size;
401 elfcpp::Sym<size, big_endian> sym(sym_p);
403 if (!strtab.get_c_string(sym.get_st_name(), &symname))
404 symname = "<unknown>";
405 printf("global %s (%d)", symname, got_symndx);
410 printf("\nPLT entries:\n");
411 for (unsigned int i = 0; i < nplt; ++i)
413 unsigned int plt_desc = igot_plt.get_plt_desc(i);
415 sym_p = symtab_view.data() + plt_desc * sym_size;
416 elfcpp::Sym<size, big_endian> sym(sym_p);
418 if (!strtab.get_c_string(sym.get_st_name(), &symname))
419 symname = "<unknown>";
420 printf("%s (%d)\n", symname, plt_desc);
423 printf("\nUnused archive symbols:\n");
424 for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
426 Entry_reader input_file(incremental_inputs.input_file(i));
428 if (input_file.type() != INCREMENTAL_INPUT_ARCHIVE)
431 const char* objname = input_file.filename();
434 fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
439 printf("[%d] %s\n", i, objname);
440 unsigned int nsyms = input_file.get_unused_symbol_count();
441 for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
442 printf(" %s\n", input_file.get_unused_symbol(symndx));
448 main(int argc, char** argv)
452 fprintf(stderr, "Usage: %s <file>\n", argv[0]);
455 const char* filename = argv[1];
457 Output_file* file = new Output_file(filename);
459 bool t = file->open_base_file(NULL, false);
462 fprintf(stderr, "%s: open_base_file(%s): %s\n", argv[0], filename,
467 Incremental_binary* inc = open_incremental_binary(file);
471 fprintf(stderr, "%s: open_incremental_binary(%s): %s\n", argv[0],
472 filename, strerror(errno));
476 switch (parameters->size_and_endianness())
478 #ifdef HAVE_TARGET_32_LITTLE
479 case Parameters::TARGET_32_LITTLE:
480 dump_incremental_inputs<32, false>(
482 static_cast<Sized_incremental_binary<32, false>*>(inc));
485 #ifdef HAVE_TARGET_32_BIG
486 case Parameters::TARGET_32_BIG:
487 dump_incremental_inputs<32, true>(
489 static_cast<Sized_incremental_binary<32, true>*>(inc));
492 #ifdef HAVE_TARGET_64_LITTLE
493 case Parameters::TARGET_64_LITTLE:
494 dump_incremental_inputs<64, false>(
496 static_cast<Sized_incremental_binary<64, false>*>(inc));
499 #ifdef HAVE_TARGET_64_BIG
500 case Parameters::TARGET_64_BIG:
501 dump_incremental_inputs<64, true>(
503 static_cast<Sized_incremental_binary<64, true>*>(inc));