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
)
297 unsigned int output_symndx
=
298 input_file
.get_output_symbol_index(symndx
, &is_def
, &is_copy
);
299 sym_p
= symtab_view
.data() + output_symndx
* sym_size
;
300 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
302 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
303 symname
= "<unknown>";
304 printf(" %6d %6s %8s %8s %8s %8s %-5s %s\n",
307 is_copy
? "COPY" : (is_def
? "DEF" : "UNDEF"),
313 for (unsigned int symndx
= 0; symndx
< nsyms
; ++symndx
)
315 Incremental_global_symbol_reader
<big_endian
> info(
316 input_file
.get_global_symbol_reader(symndx
));
317 unsigned int output_symndx
= info
.output_symndx();
318 sym_p
= symtab_view
.data() + output_symndx
* sym_size
;
319 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
321 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
322 symname
= "<unknown>";
323 printf(" %6d %6d %8d %8d %8d %8d %-5s %s\n",
326 input_file
.get_symbol_offset(symndx
),
330 info
.shndx() != elfcpp::SHN_UNDEF
? "DEF" : "UNDEF",
336 sym_p
= symtab_view
.data() + first_global
* sym_size
;
337 printf("\nGlobal symbol table:\n");
338 for (unsigned int i
= 0; i
< nglobals
; i
++)
340 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
342 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
343 symname
= "<unknown>";
344 printf("[%d] %s\n", first_global
+ i
, symname
);
345 unsigned int offset
= isymtab
.get_list_head(i
);
348 unsigned int sym_ndx
;
349 Entry_reader input_file
=
350 find_input_containing_global
<size
, big_endian
>(incremental_inputs
,
352 Incremental_global_symbol_reader
<big_endian
> sym_info(
353 input_file
.get_global_symbol_reader(sym_ndx
));
354 printf(" %s (first reloc: %d, reloc count: %d)",
355 input_file
.filename(), sym_info
.reloc_offset(),
356 sym_info
.reloc_count());
357 if (sym_info
.output_symndx() != first_global
+ i
)
358 printf(" ** wrong output symndx (%d) **", sym_info
.output_symndx());
360 // Dump the relocations from this input file for this symbol.
361 unsigned int r_off
= sym_info
.reloc_offset();
362 for (unsigned int j
= 0; j
< sym_info
.reloc_count(); j
++)
364 printf(" %4d relocation type %3d shndx %2d"
365 " offset %016llx addend %016llx %s\n",
367 irelocs
.get_r_type(r_off
),
368 irelocs
.get_r_shndx(r_off
),
369 static_cast<long long>(irelocs
.get_r_offset(r_off
)),
370 static_cast<long long>(irelocs
.get_r_addend(r_off
)),
372 r_off
+= irelocs
.reloc_size
;
374 offset
= sym_info
.next_offset();
379 Incremental_got_plt_reader
<big_endian
> igot_plt(inc
->got_plt_reader());
380 unsigned int ngot
= igot_plt
.get_got_entry_count();
381 unsigned int nplt
= igot_plt
.get_plt_entry_count();
383 printf("\nGOT entries:\n");
384 for (unsigned int i
= 0; i
< ngot
; ++i
)
386 unsigned int got_type
= igot_plt
.get_got_type(i
);
387 unsigned int got_symndx
= igot_plt
.get_got_symndx(i
);
388 unsigned int got_input_index
= igot_plt
.get_got_input_index(i
);
389 printf("[%d] type %02x, ", i
, got_type
& 0x7f);
390 if ((got_type
& 0x7f) == 0x7f)
392 else if (got_type
& 0x80)
394 Entry_reader input_file
=
395 incremental_inputs
.input_file(got_input_index
);
396 const char* objname
= input_file
.filename();
397 printf("local: %s (%d)", objname
, got_symndx
);
401 sym_p
= symtab_view
.data() + got_symndx
* sym_size
;
402 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
404 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
405 symname
= "<unknown>";
406 printf("global %s (%d)", symname
, got_symndx
);
411 printf("\nPLT entries:\n");
412 for (unsigned int i
= 0; i
< nplt
; ++i
)
414 unsigned int plt_desc
= igot_plt
.get_plt_desc(i
);
416 sym_p
= symtab_view
.data() + plt_desc
* sym_size
;
417 elfcpp::Sym
<size
, big_endian
> sym(sym_p
);
419 if (!strtab
.get_c_string(sym
.get_st_name(), &symname
))
420 symname
= "<unknown>";
421 printf("%s (%d)\n", symname
, plt_desc
);
424 printf("\nUnused archive symbols:\n");
425 for (unsigned int i
= 0; i
< incremental_inputs
.input_file_count(); ++i
)
427 Entry_reader
input_file(incremental_inputs
.input_file(i
));
429 if (input_file
.type() != INCREMENTAL_INPUT_ARCHIVE
)
432 const char* objname
= input_file
.filename();
435 fprintf(stderr
,"%s: %s: failed to get file name for object %u\n",
440 printf("[%d] %s\n", i
, objname
);
441 unsigned int nsyms
= input_file
.get_unused_symbol_count();
442 for (unsigned int symndx
= 0; symndx
< nsyms
; ++symndx
)
443 printf(" %s\n", input_file
.get_unused_symbol(symndx
));
449 main(int argc
, char** argv
)
453 fprintf(stderr
, "Usage: %s <file>\n", argv
[0]);
456 const char* filename
= argv
[1];
458 Output_file
* file
= new Output_file(filename
);
460 bool t
= file
->open_base_file(NULL
, false);
463 fprintf(stderr
, "%s: open_base_file(%s): %s\n", argv
[0], filename
,
468 Incremental_binary
* inc
= open_incremental_binary(file
);
472 fprintf(stderr
, "%s: open_incremental_binary(%s): %s\n", argv
[0],
473 filename
, strerror(errno
));
477 switch (parameters
->size_and_endianness())
479 #ifdef HAVE_TARGET_32_LITTLE
480 case Parameters::TARGET_32_LITTLE
:
481 dump_incremental_inputs
<32, false>(
483 static_cast<Sized_incremental_binary
<32, false>*>(inc
));
486 #ifdef HAVE_TARGET_32_BIG
487 case Parameters::TARGET_32_BIG
:
488 dump_incremental_inputs
<32, true>(
490 static_cast<Sized_incremental_binary
<32, true>*>(inc
));
493 #ifdef HAVE_TARGET_64_LITTLE
494 case Parameters::TARGET_64_LITTLE
:
495 dump_incremental_inputs
<64, false>(
497 static_cast<Sized_incremental_binary
<64, false>*>(inc
));
500 #ifdef HAVE_TARGET_64_BIG
501 case Parameters::TARGET_64_BIG
:
502 dump_incremental_inputs
<64, true>(
504 static_cast<Sized_incremental_binary
<64, true>*>(inc
));