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());
157 case INCREMENTAL_INPUT_ARCHIVE
:
159 printf(" Member count: %d\n", input_file
.get_member_count());
160 printf(" Unused symbol count: %d\n",
161 input_file
.get_unused_symbol_count());
163 case INCREMENTAL_INPUT_SHARED_LIBRARY
:
164 printf("Shared library\n");
165 printf(" As needed: %s\n",
166 input_file
.as_needed() ? "true" : "false");
167 printf(" soname: %s\n",
168 input_file
.get_soname());
169 printf(" Symbol count: %d\n",
170 input_file
.get_global_symbol_count());
172 case INCREMENTAL_INPUT_SCRIPT
:
173 printf("Linker script\n");
174 printf(" Object count: %d\n", input_file
.get_object_count());
177 fprintf(stderr
, "%s: invalid file type for object %u: %d\n",
178 argv0
, i
, input_type
);
183 printf("\nInput sections:\n");
184 for (unsigned int i
= 0; i
< incremental_inputs
.input_file_count(); ++i
)
186 Entry_reader
input_file(incremental_inputs
.input_file(i
));
188 if (input_file
.type() != INCREMENTAL_INPUT_OBJECT
189 && input_file
.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER
)
192 const char* objname
= input_file
.filename();
195 fprintf(stderr
,"%s: %s: failed to get file name for object %u\n",
200 printf("[%d] %s\n", i
, objname
);
202 printf(" %3s %6s %8s %8s %s\n",
203 "n", "outndx", "offset", "size", "name");
204 unsigned int nsections
= input_file
.get_input_section_count();
205 for (unsigned int shndx
= 0; shndx
< nsections
; ++shndx
)
207 typename
Entry_reader::Input_section_info
info(
208 input_file
.get_input_section(shndx
));
209 printf(" %3d %6d %8lld %8lld %s\n", shndx
+ 1,
211 static_cast<long long>(info
.sh_offset
),
212 static_cast<long long>(info
.sh_size
),
217 // Get a view of the .symtab section.
219 elfcpp::Elf_file
<size
, big_endian
, Incremental_binary
> elf_file(inc
);
221 unsigned int symtab_shndx
= elf_file
.find_section_by_type(elfcpp::SHT_SYMTAB
);
222 if (symtab_shndx
== elfcpp::SHN_UNDEF
) // Not found.
224 fprintf(stderr
, "%s: %s: no symbol table section\n", argv0
, filename
);
227 Location
symtab_location(elf_file
.section_contents(symtab_shndx
));
228 View
symtab_view(inc
->view(symtab_location
));
230 // Get a view of the .strtab section.
232 unsigned int strtab_shndx
= elf_file
.section_link(symtab_shndx
);
233 if (strtab_shndx
== elfcpp::SHN_UNDEF
234 || strtab_shndx
> elf_file
.shnum()
235 || elf_file
.section_type(strtab_shndx
) != elfcpp::SHT_STRTAB
)
237 fprintf(stderr
, "%s: %s: no string table section\n", argv0
, filename
);
240 Location
strtab_location(elf_file
.section_contents(strtab_shndx
));
241 View
strtab_view(inc
->view(strtab_location
));
242 elfcpp::Elf_strtab
strtab(strtab_view
.data(), strtab_location
.data_size
);
244 // The .gnu_incremental_symtab section contains entries that parallel
245 // the global symbols of the main symbol table. The sh_info field
246 // of the main symbol table's section header tells us how many global
247 // symbols there are, but that count does not include any global
248 // symbols that were forced local during the link. Therefore, we
249 // use the size of the .gnu_incremental_symtab section to deduce
250 // the number of global symbols + forced-local symbols there are
251 // in the symbol table.
252 Incremental_symtab_reader
<big_endian
> isymtab(inc
->symtab_reader());
253 Incremental_relocs_reader
<size
, big_endian
> irelocs(inc
->relocs_reader());
254 unsigned int sym_size
= elfcpp::Elf_sizes
<size
>::sym_size
;
255 unsigned int nsyms
= symtab_location
.data_size
/ sym_size
;
256 unsigned int nglobals
= isymtab
.symbol_count();
257 unsigned int first_global
= nsyms
- nglobals
;
258 unsigned const char* sym_p
;
260 printf("\nGlobal symbols per input file:\n");
261 for (unsigned int i
= 0; i
< incremental_inputs
.input_file_count(); ++i
)
263 Entry_reader
input_file(incremental_inputs
.input_file(i
));
265 if (input_file
.type() != INCREMENTAL_INPUT_OBJECT
266 && input_file
.type() != INCREMENTAL_INPUT_ARCHIVE_MEMBER
267 && input_file
.type() != INCREMENTAL_INPUT_SHARED_LIBRARY
)
270 const char* objname
= input_file
.filename();
273 fprintf(stderr
,"%s: %s: failed to get file name for object %u\n",
278 printf("[%d] %s\n", i
, objname
);
280 unsigned int nsyms
= input_file
.get_global_symbol_count();
282 printf(" %6s %6s %8s %8s %8s %8s\n",
283 "outndx", "shndx", "offset", "chain", "#relocs", "rbase");
284 if (input_file
.type() == INCREMENTAL_INPUT_SHARED_LIBRARY
)
286 for (unsigned int symndx
= 0; symndx
< nsyms
; ++symndx
)
289 unsigned int output_symndx
=
290 input_file
.get_output_symbol_index(symndx
, &is_def
);
291 sym_p
= symtab_view
.data() + output_symndx
* sym_size
;
292 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
294 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
295 symname
= "<unknown>";
296 printf(" %6d %6s %8s %8s %8s %8s %-5s %s\n",
299 is_def
? "DEF" : "UNDEF",
305 for (unsigned int symndx
= 0; symndx
< nsyms
; ++symndx
)
307 Incremental_global_symbol_reader
<big_endian
> info(
308 input_file
.get_global_symbol_reader(symndx
));
309 unsigned int output_symndx
= info
.output_symndx();
310 sym_p
= symtab_view
.data() + output_symndx
* sym_size
;
311 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
313 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
314 symname
= "<unknown>";
315 printf(" %6d %6d %8d %8d %8d %8d %-5s %s\n",
318 input_file
.get_symbol_offset(symndx
),
322 info
.shndx() != elfcpp::SHN_UNDEF
? "DEF" : "UNDEF",
328 sym_p
= symtab_view
.data() + first_global
* sym_size
;
329 printf("\nGlobal symbol table:\n");
330 for (unsigned int i
= 0; i
< nglobals
; i
++)
332 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
334 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
335 symname
= "<unknown>";
336 printf("[%d] %s\n", first_global
+ i
, symname
);
337 unsigned int offset
= isymtab
.get_list_head(i
);
340 unsigned int sym_ndx
;
341 Entry_reader input_file
=
342 find_input_containing_global
<size
, big_endian
>(incremental_inputs
,
344 Incremental_global_symbol_reader
<big_endian
> sym_info(
345 input_file
.get_global_symbol_reader(sym_ndx
));
346 printf(" %s (first reloc: %d, reloc count: %d)",
347 input_file
.filename(), sym_info
.reloc_offset(),
348 sym_info
.reloc_count());
349 if (sym_info
.output_symndx() != first_global
+ i
)
350 printf(" ** wrong output symndx (%d) **", sym_info
.output_symndx());
352 // Dump the relocations from this input file for this symbol.
353 unsigned int r_off
= sym_info
.reloc_offset();
354 for (unsigned int j
= 0; j
< sym_info
.reloc_count(); j
++)
356 printf(" %4d relocation type %3d shndx %2d"
357 " offset %016llx addend %016llx %s\n",
359 irelocs
.get_r_type(r_off
),
360 irelocs
.get_r_shndx(r_off
),
361 static_cast<long long>(irelocs
.get_r_offset(r_off
)),
362 static_cast<long long>(irelocs
.get_r_addend(r_off
)),
364 r_off
+= irelocs
.reloc_size
;
366 offset
= sym_info
.next_offset();
371 Incremental_got_plt_reader
<big_endian
> igot_plt(inc
->got_plt_reader());
372 unsigned int ngot
= igot_plt
.get_got_entry_count();
373 unsigned int nplt
= igot_plt
.get_plt_entry_count();
375 printf("\nGOT entries:\n");
376 for (unsigned int i
= 0; i
< ngot
; ++i
)
378 unsigned int got_type
= igot_plt
.get_got_type(i
);
379 unsigned int got_symndx
= igot_plt
.get_got_symndx(i
);
380 unsigned int got_input_index
= igot_plt
.get_got_input_index(i
);
381 printf("[%d] type %02x, ", i
, got_type
& 0x7f);
382 if ((got_type
& 0x7f) == 0x7f)
384 else if (got_type
& 0x80)
386 Entry_reader input_file
=
387 incremental_inputs
.input_file(got_input_index
);
388 const char* objname
= input_file
.filename();
389 printf("local: %s (%d)", objname
, got_symndx
);
393 sym_p
= symtab_view
.data() + got_symndx
* sym_size
;
394 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
396 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
397 symname
= "<unknown>";
398 printf("global %s (%d)", symname
, got_symndx
);
403 printf("\nPLT entries:\n");
404 for (unsigned int i
= 0; i
< nplt
; ++i
)
406 unsigned int plt_desc
= igot_plt
.get_plt_desc(i
);
408 sym_p
= symtab_view
.data() + plt_desc
* sym_size
;
409 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
411 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
412 symname
= "<unknown>";
413 printf("%s (%d)\n", symname
, plt_desc
);
416 printf("\nUnused archive symbols:\n");
417 for (unsigned int i
= 0; i
< incremental_inputs
.input_file_count(); ++i
)
419 Entry_reader
input_file(incremental_inputs
.input_file(i
));
421 if (input_file
.type() != INCREMENTAL_INPUT_ARCHIVE
)
424 const char* objname
= input_file
.filename();
427 fprintf(stderr
,"%s: %s: failed to get file name for object %u\n",
432 printf("[%d] %s\n", i
, objname
);
433 unsigned int nsyms
= input_file
.get_unused_symbol_count();
434 for (unsigned int symndx
= 0; symndx
< nsyms
; ++symndx
)
435 printf(" %s\n", input_file
.get_unused_symbol(symndx
));
441 main(int argc
, char** argv
)
445 fprintf(stderr
, "Usage: %s <file>\n", argv
[0]);
448 const char* filename
= argv
[1];
450 Output_file
* file
= new Output_file(filename
);
452 bool t
= file
->open_base_file(NULL
, false);
455 fprintf(stderr
, "%s: open_base_file(%s): %s\n", argv
[0], filename
,
460 Incremental_binary
* inc
= open_incremental_binary(file
);
464 fprintf(stderr
, "%s: open_incremental_binary(%s): %s\n", argv
[0],
465 filename
, strerror(errno
));
469 switch (parameters
->size_and_endianness())
471 #ifdef HAVE_TARGET_32_LITTLE
472 case Parameters::TARGET_32_LITTLE
:
473 dump_incremental_inputs
<32, false>(
475 static_cast<Sized_incremental_binary
<32, false>*>(inc
));
478 #ifdef HAVE_TARGET_32_BIG
479 case Parameters::TARGET_32_BIG
:
480 dump_incremental_inputs
<32, true>(
482 static_cast<Sized_incremental_binary
<32, true>*>(inc
));
485 #ifdef HAVE_TARGET_64_LITTLE
486 case Parameters::TARGET_64_LITTLE
:
487 dump_incremental_inputs
<64, false>(
489 static_cast<Sized_incremental_binary
<64, false>*>(inc
));
492 #ifdef HAVE_TARGET_64_BIG
493 case Parameters::TARGET_64_BIG
:
494 dump_incremental_inputs
<64, true>(
496 static_cast<Sized_incremental_binary
<64, true>*>(inc
));