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)) / 16;
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 Incremental_input_type input_type = input_file.type();
136 case INCREMENTAL_INPUT_OBJECT:
138 printf(" Input section count: %d\n",
139 input_file.get_input_section_count());
140 printf(" Symbol count: %d\n",
141 input_file.get_global_symbol_count());
143 case INCREMENTAL_INPUT_ARCHIVE_MEMBER:
144 printf("Archive member\n");
145 printf(" Input section count: %d\n",
146 input_file.get_input_section_count());
147 printf(" Symbol count: %d\n",
148 input_file.get_global_symbol_count());
150 case INCREMENTAL_INPUT_ARCHIVE:
152 printf(" Member count: %d\n", input_file.get_member_count());
153 printf(" Unused symbol count: %d\n",
154 input_file.get_unused_symbol_count());
156 case INCREMENTAL_INPUT_SHARED_LIBRARY:
157 printf("Shared library\n");
158 printf(" Symbol count: %d\n",
159 input_file.get_global_symbol_count());
161 case INCREMENTAL_INPUT_SCRIPT:
162 printf("Linker script\n");
163 printf(" Object count: %d\n", input_file.get_object_count());
166 fprintf(stderr, "%s: invalid file type for object %u: %d\n",
167 argv0, i, input_type);
172 printf("\nInput sections:\n");
173 for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
175 Entry_reader input_file(incremental_inputs.input_file(i));
177 if (input_file.type() != INCREMENTAL_INPUT_OBJECT
178 && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
181 const char* objname = input_file.filename();
184 fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
189 printf("[%d] %s\n", i, objname);
191 printf(" %3s %6s %8s %8s %s\n",
192 "n", "outndx", "offset", "size", "name");
193 unsigned int nsections = input_file.get_input_section_count();
194 for (unsigned int shndx = 0; shndx < nsections; ++shndx)
196 typename Entry_reader::Input_section_info info(
197 input_file.get_input_section(shndx));
198 printf(" %3d %6d %8lld %8lld %s\n", shndx,
200 static_cast<long long>(info.sh_offset),
201 static_cast<long long>(info.sh_size),
206 printf("\nGlobal symbols per input file:\n");
207 for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
209 Entry_reader input_file(incremental_inputs.input_file(i));
211 if (input_file.type() != INCREMENTAL_INPUT_OBJECT
212 && input_file.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER)
215 const char* objname = input_file.filename();
218 fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
223 printf("[%d] %s\n", i, objname);
225 unsigned int nsyms = input_file.get_global_symbol_count();
227 printf(" %6s %8s %8s %8s %8s\n",
228 "outndx", "offset", "chain", "#relocs", "rbase");
229 for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
231 typename Entry_reader::Global_symbol_info info(
232 input_file.get_global_symbol_info(symndx));
233 printf(" %6d %8d %8d %8d %8d\n",
235 input_file.get_symbol_offset(symndx),
242 // Get a view of the .symtab section.
244 elfcpp::Elf_file<size, big_endian, Incremental_binary> elf_file(inc);
246 unsigned int symtab_shndx = elf_file.find_section_by_type(elfcpp::SHT_SYMTAB);
247 if (symtab_shndx == elfcpp::SHN_UNDEF) // Not found.
249 fprintf(stderr, "%s: %s: no symbol table section\n", argv0, filename);
252 Location symtab_location(elf_file.section_contents(symtab_shndx));
253 View symtab_view(inc->view(symtab_location));
255 // Get a view of the .strtab section.
257 unsigned int strtab_shndx = elf_file.section_link(symtab_shndx);
258 if (strtab_shndx == elfcpp::SHN_UNDEF
259 || strtab_shndx > elf_file.shnum()
260 || elf_file.section_type(strtab_shndx) != elfcpp::SHT_STRTAB)
262 fprintf(stderr, "%s: %s: no string table section\n", argv0, filename);
265 Location strtab_location(elf_file.section_contents(strtab_shndx));
266 View strtab_view(inc->view(strtab_location));
267 elfcpp::Elf_strtab strtab(strtab_view.data(), strtab_location.data_size);
269 // The .gnu_incremental_symtab section contains entries that parallel
270 // the global symbols of the main symbol table. The sh_info field
271 // of the main symbol table's section header tells us how many global
272 // symbols there are, but that count does not include any global
273 // symbols that were forced local during the link. Therefore, we
274 // use the size of the .gnu_incremental_symtab section to deduce
275 // the number of global symbols + forced-local symbols there are
276 // in the symbol table.
277 Incremental_symtab_reader<big_endian> isymtab(inc->symtab_reader());
278 Incremental_relocs_reader<size, big_endian> irelocs(inc->relocs_reader());
279 unsigned int sym_size = elfcpp::Elf_sizes<size>::sym_size;
280 unsigned int nsyms = symtab_location.data_size / sym_size;
281 unsigned int nglobals = isymtab.symbol_count();
282 unsigned int first_global = nsyms - nglobals;
283 unsigned const char* sym_p = symtab_view.data() + first_global * sym_size;
285 printf("\nGlobal symbol table:\n");
286 for (unsigned int i = 0; i < nglobals; i++)
288 elfcpp::Sym<size, big_endian> sym(sym_p);
290 if (!strtab.get_c_string(sym.get_st_name(), &symname))
291 symname = "<unknown>";
292 printf("[%d] %s\n", first_global + i, symname);
293 unsigned int offset = isymtab.get_list_head(i);
296 unsigned int sym_ndx;
297 Entry_reader input_file =
298 find_input_containing_global<size, big_endian>(incremental_inputs,
300 typename Entry_reader::Global_symbol_info sym_info(
301 input_file.get_global_symbol_info(sym_ndx));
302 printf(" %s (first reloc: %d, reloc count: %d)",
303 input_file.filename(), sym_info.reloc_offset,
304 sym_info.reloc_count);
305 if (sym_info.output_symndx != first_global + i)
306 printf(" ** wrong output symndx (%d) **", sym_info.output_symndx);
308 // Dump the relocations from this input file for this symbol.
309 unsigned int r_off = sym_info.reloc_offset;
310 for (unsigned int j = 0; j < sym_info.reloc_count; j++)
312 printf(" %4d relocation type %3d shndx %d"
313 " offset %016llx addend %016llx %s\n",
315 irelocs.get_r_type(r_off),
316 irelocs.get_r_shndx(r_off),
317 static_cast<long long>(irelocs.get_r_offset(r_off)),
318 static_cast<long long>(irelocs.get_r_addend(r_off)),
320 r_off += irelocs.reloc_size;
322 offset = sym_info.next_offset;
327 Incremental_got_plt_reader<big_endian> igot_plt(inc->got_plt_reader());
328 unsigned int ngot = igot_plt.get_got_entry_count();
329 unsigned int nplt = igot_plt.get_plt_entry_count();
331 printf("\nGOT entries:\n");
332 for (unsigned int i = 0; i < ngot; ++i)
334 unsigned int got_type = igot_plt.get_got_type(i);
335 unsigned int got_desc = igot_plt.get_got_desc(i);
336 printf("[%d] type %02x, ", i, got_type & 0x7f);
337 if (got_type == 0x7f)
339 else if (got_type & 0x80)
341 Entry_reader input_file = incremental_inputs.input_file(got_desc);
342 const char* objname = input_file.filename();
343 printf("local: %s (%d)", objname, got_desc);
347 sym_p = symtab_view.data() + got_desc * sym_size;
348 elfcpp::Sym<size, big_endian> sym(sym_p);
350 if (!strtab.get_c_string(sym.get_st_name(), &symname))
351 symname = "<unknown>";
352 printf("global %s (%d)", symname, got_desc);
357 printf("\nPLT entries:\n");
358 for (unsigned int i = 0; i < nplt; ++i)
360 unsigned int plt_desc = igot_plt.get_plt_desc(i);
362 sym_p = symtab_view.data() + plt_desc * sym_size;
363 elfcpp::Sym<size, big_endian> sym(sym_p);
365 if (!strtab.get_c_string(sym.get_st_name(), &symname))
366 symname = "<unknown>";
367 printf("%s (%d)\n", symname, plt_desc);
370 printf("\nUnused archive symbols:\n");
371 for (unsigned int i = 0; i < incremental_inputs.input_file_count(); ++i)
373 Entry_reader input_file(incremental_inputs.input_file(i));
375 if (input_file.type() != INCREMENTAL_INPUT_ARCHIVE)
378 const char* objname = input_file.filename();
381 fprintf(stderr,"%s: %s: failed to get file name for object %u\n",
386 printf("[%d] %s\n", i, objname);
387 unsigned int nsyms = input_file.get_unused_symbol_count();
388 for (unsigned int symndx = 0; symndx < nsyms; ++symndx)
389 printf(" %s\n", input_file.get_unused_symbol(symndx));
395 main(int argc, char** argv)
399 fprintf(stderr, "Usage: %s <file>\n", argv[0]);
402 const char* filename = argv[1];
404 Output_file* file = new Output_file(filename);
406 bool t = file->open_for_modification();
409 fprintf(stderr, "%s: open_for_modification(%s): %s\n", argv[0], filename,
414 Incremental_binary* inc = open_incremental_binary(file);
418 fprintf(stderr, "%s: open_incremental_binary(%s): %s\n", argv[0],
419 filename, strerror(errno));
423 switch (parameters->size_and_endianness())
425 #ifdef HAVE_TARGET_32_LITTLE
426 case Parameters::TARGET_32_LITTLE:
427 dump_incremental_inputs<32, false>(
429 static_cast<Sized_incremental_binary<32, false>*>(inc));
432 #ifdef HAVE_TARGET_32_BIG
433 case Parameters::TARGET_32_BIG:
434 dump_incremental_inputs<32, true>(
436 static_cast<Sized_incremental_binary<32, true>*>(inc));
439 #ifdef HAVE_TARGET_64_LITTLE
440 case Parameters::TARGET_64_LITTLE:
441 dump_incremental_inputs<64, false>(
443 static_cast<Sized_incremental_binary<64, false>*>(inc));
446 #ifdef HAVE_TARGET_64_BIG
447 case Parameters::TARGET_64_BIG:
448 dump_incremental_inputs<64, true>(
450 static_cast<Sized_incremental_binary<64, true>*>(inc));