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
));