Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file bfd_support.cpp |
| 3 | * BFD muck we have to deal with. |
| 4 | * |
| 5 | * @remark Copyright 2005 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author John Levon |
| 9 | */ |
| 10 | |
| 11 | #include "bfd_support.h" |
| 12 | |
| 13 | #include "op_bfd.h" |
| 14 | #include "op_fileio.h" |
| 15 | #include "op_config.h" |
| 16 | #include "string_manip.h" |
| 17 | #include "file_manip.h" |
| 18 | #include "cverb.h" |
| 19 | #include "locate_images.h" |
| 20 | |
| 21 | #include <cstdlib> |
| 22 | #include <cstring> |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame] | 23 | #include <cassert> |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 24 | #include <iostream> |
| 25 | #include <fstream> |
| 26 | #include <sstream> |
| 27 | #include <string> |
| 28 | #include <cstring> |
| 29 | #include <cstdlib> |
| 30 | |
| 31 | using namespace std; |
| 32 | |
| 33 | extern verbose vbfd; |
| 34 | |
| 35 | namespace { |
| 36 | |
| 37 | |
| 38 | void check_format(string const & file, bfd ** ibfd) |
| 39 | { |
| 40 | if (!bfd_check_format_matches(*ibfd, bfd_object, NULL)) { |
| 41 | cverb << vbfd << "BFD format failure for " << file << endl; |
| 42 | bfd_close(*ibfd); |
| 43 | *ibfd = NULL; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | |
| 48 | bool separate_debug_file_exists(string & name, unsigned long const crc, |
| 49 | extra_images const & extra) |
| 50 | { |
| 51 | unsigned long file_crc = 0; |
| 52 | // The size of 2 * 1024 elements for the buffer is arbitrary. |
| 53 | char buffer[2 * 1024]; |
| 54 | |
| 55 | image_error img_ok; |
| 56 | string const image_path = extra.find_image_path(name, img_ok, true); |
| 57 | |
| 58 | if (img_ok != image_ok) |
| 59 | return false; |
| 60 | |
| 61 | name = image_path; |
| 62 | |
| 63 | ifstream file(image_path.c_str()); |
| 64 | if (!file) |
| 65 | return false; |
| 66 | |
| 67 | cverb << vbfd << "found " << name; |
| 68 | while (file) { |
| 69 | file.read(buffer, sizeof(buffer)); |
| 70 | file_crc = calc_crc32(file_crc, |
| 71 | reinterpret_cast<unsigned char *>(&buffer[0]), |
| 72 | file.gcount()); |
| 73 | } |
| 74 | cverb << vbfd << " with crc32 = " << hex << file_crc << endl; |
| 75 | return crc == file_crc; |
| 76 | } |
| 77 | |
| 78 | |
| 79 | bool get_debug_link_info(bfd * ibfd, string & filename, unsigned long & crc32) |
| 80 | { |
| 81 | asection * sect; |
| 82 | |
| 83 | cverb << vbfd << "fetching .gnu_debuglink section" << endl; |
| 84 | sect = bfd_get_section_by_name(ibfd, ".gnu_debuglink"); |
| 85 | |
| 86 | if (sect == NULL) |
| 87 | return false; |
| 88 | |
| 89 | bfd_size_type debuglink_size = bfd_section_size(ibfd, sect); |
| 90 | char contents[debuglink_size]; |
| 91 | cverb << vbfd |
| 92 | << ".gnu_debuglink section has size " << debuglink_size << endl; |
| 93 | |
| 94 | if (!bfd_get_section_contents(ibfd, sect, |
| 95 | reinterpret_cast<unsigned char *>(contents), |
| 96 | static_cast<file_ptr>(0), debuglink_size)) { |
| 97 | bfd_perror("bfd_get_section_contents:get_debug:"); |
| 98 | exit(2); |
| 99 | } |
| 100 | |
| 101 | /* CRC value is stored after the filename, aligned up to 4 bytes. */ |
| 102 | size_t filename_len = strlen(contents); |
| 103 | size_t crc_offset = filename_len + 1; |
| 104 | crc_offset = (crc_offset + 3) & ~3; |
| 105 | |
| 106 | crc32 = bfd_get_32(ibfd, |
| 107 | reinterpret_cast<bfd_byte *>(contents + crc_offset)); |
| 108 | filename = string(contents, filename_len); |
| 109 | cverb << vbfd << ".gnu_debuglink filename is " << filename << endl; |
| 110 | return true; |
| 111 | } |
| 112 | |
| 113 | |
| 114 | /** |
| 115 | * With Objective C, we'll get strings like: |
| 116 | * |
| 117 | * _i_GSUnicodeString__rangeOfCharacterSetFromSet_options_range |
| 118 | * |
| 119 | * for the symbol name, and: |
| 120 | * -[GSUnicodeString rangeOfCharacterFromSet:options:range:] |
| 121 | * |
| 122 | * for the function name, so we have to do some looser matching |
| 123 | * than for other languages (unfortunately, it's not possible |
| 124 | * to demangle Objective C symbols). |
| 125 | */ |
| 126 | bool objc_match(string const & sym, string const & method) |
| 127 | { |
| 128 | if (method.length() < 3) |
| 129 | return false; |
| 130 | |
| 131 | string mangled; |
| 132 | |
| 133 | if (is_prefix(method, "-[")) { |
| 134 | mangled += "_i_"; |
| 135 | } else if (is_prefix(method, "+[")) { |
| 136 | mangled += "_c_"; |
| 137 | } else { |
| 138 | return false; |
| 139 | } |
| 140 | |
| 141 | string::const_iterator it = method.begin() + 2; |
| 142 | string::const_iterator const end = method.end(); |
| 143 | |
| 144 | bool found_paren = false; |
| 145 | |
| 146 | for (; it != end; ++it) { |
| 147 | switch (*it) { |
| 148 | case ' ': |
| 149 | mangled += '_'; |
| 150 | if (!found_paren) |
| 151 | mangled += '_'; |
| 152 | break; |
| 153 | case ':': |
| 154 | mangled += '_'; |
| 155 | break; |
| 156 | case ')': |
| 157 | case ']': |
| 158 | break; |
| 159 | case '(': |
| 160 | found_paren = true; |
| 161 | mangled += '_'; |
| 162 | break; |
| 163 | default: |
| 164 | mangled += *it; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | return sym == mangled; |
| 169 | } |
| 170 | |
| 171 | |
| 172 | /* |
| 173 | * With a binary image where some objects are missing debug |
| 174 | * info, we can end up attributing to a completely different |
| 175 | * function (#484660): bfd_nearest_line() will happily move from one |
| 176 | * symbol to the nearest one it can find with debug information. |
| 177 | * To mitigate this problem, we check that the symbol name |
| 178 | * matches the returned function name. |
| 179 | * |
| 180 | * However, this check fails in some cases it shouldn't: |
| 181 | * Objective C, and C++ static inline functions (as discussed in |
| 182 | * GCC bugzilla #11774). So, we have a looser check that |
| 183 | * accepts merely a substring, plus some magic for Objective C. |
| 184 | * |
| 185 | * If even the loose check fails, then we give up. |
| 186 | */ |
| 187 | bool is_correct_function(string const & function, string const & name) |
| 188 | { |
| 189 | if (name == function) |
| 190 | return true; |
| 191 | |
| 192 | if (objc_match(name, function)) |
| 193 | return true; |
| 194 | |
| 195 | // warn the user if we had to use the loose check |
| 196 | if (name.find(function) != string::npos) { |
| 197 | static bool warned = false; |
| 198 | if (!warned) { |
| 199 | cerr << "warning: some functions compiled without " |
| 200 | << "debug information may have incorrect source " |
| 201 | << "line attributions" << endl; |
| 202 | warned = true; |
| 203 | } |
| 204 | cverb << vbfd << "is_correct_function(" << function << ", " |
| 205 | << name << ") fuzzy match." << endl; |
| 206 | return true; |
| 207 | } |
| 208 | |
| 209 | return false; |
| 210 | } |
| 211 | |
| 212 | |
| 213 | /* |
| 214 | * binutils 2.12 and below have a small bug where functions without a |
| 215 | * debug entry at the prologue start do not give a useful line number |
| 216 | * from bfd_find_nearest_line(). This can happen with certain gcc |
| 217 | * versions such as 2.95. |
| 218 | * |
| 219 | * We work around this problem by scanning forward for a vma with valid |
| 220 | * linenr info, if we can't get a valid line number. Problem uncovered |
| 221 | * by Norbert Kaufmann. The work-around decreases, on the tincas |
| 222 | * application, the number of failure to retrieve linenr info from 835 |
| 223 | * to 173. Most of the remaining are c++ inline functions mainly from |
| 224 | * the STL library. Fix #529622 |
| 225 | */ |
| 226 | void fixup_linenr(bfd * abfd, asection * section, asymbol ** syms, |
| 227 | string const & name, bfd_vma pc, |
| 228 | char const ** filename, unsigned int * line) |
| 229 | { |
| 230 | char const * cfilename; |
| 231 | char const * function; |
| 232 | unsigned int linenr; |
| 233 | |
| 234 | // FIXME: looking at debug info for all gcc version shows than |
| 235 | // the same problems can -perhaps- occur for epilog code: find a |
| 236 | // samples files with samples in epilog and try opreport -l -g |
| 237 | // on it, check it also with opannotate. |
| 238 | |
| 239 | // first restrict the search on a sensible range of vma, 16 is |
| 240 | // an intuitive value based on epilog code look |
| 241 | size_t max_search = 16; |
| 242 | size_t section_size = bfd_section_size(abfd, section); |
| 243 | if (pc + max_search > section_size) |
| 244 | max_search = section_size - pc; |
| 245 | |
| 246 | for (size_t i = 1; i < max_search; ++i) { |
| 247 | bool ret = bfd_find_nearest_line(abfd, section, syms, pc + i, |
| 248 | &cfilename, &function, |
| 249 | &linenr); |
| 250 | |
| 251 | if (ret && cfilename && function && linenr != 0 |
| 252 | && is_correct_function(function, name)) { |
| 253 | *filename = cfilename; |
| 254 | *line = linenr; |
| 255 | return; |
| 256 | } |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | |
| 261 | } // namespace anon |
| 262 | |
| 263 | |
| 264 | bfd * open_bfd(string const & file) |
| 265 | { |
| 266 | /* bfd keeps its own reference to the filename char *, |
| 267 | * so it must have a lifetime longer than the ibfd */ |
| 268 | bfd * ibfd = bfd_openr(file.c_str(), NULL); |
| 269 | if (!ibfd) { |
| 270 | cverb << vbfd << "bfd_openr failed for " << file << endl; |
| 271 | return NULL; |
| 272 | } |
| 273 | |
| 274 | check_format(file, &ibfd); |
| 275 | |
| 276 | return ibfd; |
| 277 | } |
| 278 | |
| 279 | |
| 280 | bfd * fdopen_bfd(string const & file, int fd) |
| 281 | { |
| 282 | /* bfd keeps its own reference to the filename char *, |
| 283 | * so it must have a lifetime longer than the ibfd */ |
| 284 | bfd * ibfd = bfd_fdopenr(file.c_str(), NULL, fd); |
| 285 | if (!ibfd) { |
| 286 | cverb << vbfd << "bfd_openr failed for " << file << endl; |
| 287 | return NULL; |
| 288 | } |
| 289 | |
| 290 | check_format(file, &ibfd); |
| 291 | |
| 292 | return ibfd; |
| 293 | } |
| 294 | |
| 295 | |
| 296 | bool find_separate_debug_file(bfd * ibfd, string const & filepath_in, |
| 297 | string & debug_filename, extra_images const & extra) |
| 298 | { |
| 299 | string filepath(filepath_in); |
| 300 | string basename; |
| 301 | unsigned long crc32; |
| 302 | |
| 303 | if (!get_debug_link_info(ibfd, basename, crc32)) |
| 304 | return false; |
| 305 | |
| 306 | // Work out the image file's directory prefix |
| 307 | string filedir = op_dirname(filepath); |
| 308 | // Make sure it starts with / |
| 309 | if (filedir.size() > 0 && filedir.at(filedir.size() - 1) != '/') |
| 310 | filedir += '/'; |
| 311 | |
| 312 | string first_try(filedir + ".debug/" + basename); |
| 313 | string second_try(DEBUGDIR + filedir + basename); |
| 314 | string third_try(filedir + basename); |
| 315 | |
| 316 | cverb << vbfd << "looking for debugging file " << basename |
| 317 | << " with crc32 = " << hex << crc32 << endl; |
| 318 | |
| 319 | if (separate_debug_file_exists(first_try, crc32, extra)) |
| 320 | debug_filename = first_try; |
| 321 | else if (separate_debug_file_exists(second_try, crc32, extra)) |
| 322 | debug_filename = second_try; |
| 323 | else if (separate_debug_file_exists(third_try, crc32, extra)) |
| 324 | debug_filename = third_try; |
| 325 | else |
| 326 | return false; |
| 327 | |
| 328 | return true; |
| 329 | } |
| 330 | |
| 331 | |
| 332 | bool interesting_symbol(asymbol * sym) |
| 333 | { |
| 334 | // #717720 some binutils are miscompiled by gcc 2.95, one of the |
| 335 | // typical symptom can be catched here. |
| 336 | if (!sym->section) { |
| 337 | ostringstream os; |
| 338 | os << "Your version of binutils seems to have a bug.\n" |
| 339 | << "Read http://oprofile.sf.net/faq/#binutilsbug\n"; |
| 340 | throw op_runtime_error(os.str()); |
| 341 | } |
| 342 | |
| 343 | if (!(sym->section->flags & SEC_CODE)) |
| 344 | return false; |
| 345 | |
| 346 | // returning true for fix up in op_bfd_symbol() |
| 347 | if (!sym->name || sym->name[0] == '\0') |
| 348 | return true; |
| 349 | /* ARM assembler internal mapping symbols aren't interesting */ |
| 350 | if ((strcmp("$a", sym->name) == 0) || |
| 351 | (strcmp("$t", sym->name) == 0) || |
| 352 | (strcmp("$d", sym->name) == 0)) |
| 353 | return false; |
| 354 | |
| 355 | // C++ exception stuff |
| 356 | if (sym->name[0] == '.' && sym->name[1] == 'L') |
| 357 | return false; |
| 358 | |
| 359 | /* This case cannot be moved to boring_symbol(), |
| 360 | * because that's only used for duplicate VMAs, |
| 361 | * and sometimes this symbol appears at an address |
| 362 | * different from all other symbols. |
| 363 | */ |
| 364 | if (!strcmp("gcc2_compiled.", sym->name)) |
| 365 | return false; |
| 366 | |
| 367 | if (sym->flags & BSF_SECTION_SYM) |
| 368 | return false; |
| 369 | |
| 370 | if (!(sym->section->flags & SEC_LOAD)) |
| 371 | return false; |
| 372 | |
| 373 | return true; |
| 374 | } |
| 375 | |
| 376 | |
| 377 | bool boring_symbol(op_bfd_symbol const & first, op_bfd_symbol const & second) |
| 378 | { |
| 379 | if (first.name() == "Letext") |
| 380 | return true; |
| 381 | else if (second.name() == "Letext") |
| 382 | return false; |
| 383 | |
| 384 | if (first.name().substr(0, 2) == "??") |
| 385 | return true; |
| 386 | else if (second.name().substr(0, 2) == "??") |
| 387 | return false; |
| 388 | |
| 389 | if (first.hidden() && !second.hidden()) |
| 390 | return true; |
| 391 | else if (!first.hidden() && second.hidden()) |
| 392 | return false; |
| 393 | |
| 394 | if (first.name()[0] == '_' && second.name()[0] != '_') |
| 395 | return true; |
| 396 | else if (first.name()[0] != '_' && second.name()[0] == '_') |
| 397 | return false; |
| 398 | |
| 399 | if (first.weak() && !second.weak()) |
| 400 | return true; |
| 401 | else if (!first.weak() && second.weak()) |
| 402 | return false; |
| 403 | |
| 404 | return false; |
| 405 | } |
| 406 | |
| 407 | |
| 408 | bool bfd_info::has_debug_info() const |
| 409 | { |
| 410 | if (!valid()) |
| 411 | return false; |
| 412 | |
| 413 | for (asection const * sect = abfd->sections; sect; sect = sect->next) { |
| 414 | if (sect->flags & SEC_DEBUGGING) |
| 415 | return true; |
| 416 | } |
| 417 | |
| 418 | return false; |
| 419 | } |
| 420 | |
| 421 | |
| 422 | bfd_info::~bfd_info() |
| 423 | { |
| 424 | free(synth_syms); |
| 425 | close(); |
| 426 | } |
| 427 | |
| 428 | |
| 429 | void bfd_info::close() |
| 430 | { |
| 431 | if (abfd) |
| 432 | bfd_close(abfd); |
| 433 | } |
| 434 | |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame] | 435 | /** |
| 436 | * This function is only called when processing symbols retrieved from a |
| 437 | * debuginfo file that is separate from the actual runtime binary image. |
| 438 | * Separate debuginfo files may be needed in two different cases: |
| 439 | * 1) the real image is completely stripped, where there is no symbol |
| 440 | information at all |
| 441 | * 2) the real image has debuginfo stripped, and the user is requesting "-g" |
| 442 | * (src file/line num info) |
| 443 | * After all symbols are gathered up, there will be some filtering/removal of |
| 444 | * unnecessary symbols. In particular, the bfd_info::interesting_symbol() |
| 445 | * function filters out symbols whose section's flag value does not include |
| 446 | * SEC_LOAD. This filtering is required, so it must be retained. However, |
| 447 | * we run into a problem with symbols from debuginfo files, since the |
| 448 | * section flag does NOT include SEC_LOAD. To solve this problem, the |
| 449 | * translate_debuginfo_syms function maps the debuginfo symbol's sections to |
| 450 | * that of their corresponding real image. |
| 451 | */ |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 452 | void bfd_info::translate_debuginfo_syms(asymbol ** dbg_syms, long nr_dbg_syms) |
| 453 | { |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 454 | unsigned int img_sect_cnt = 0; |
| 455 | bfd * image_bfd = image_bfd_info->abfd; |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame] | 456 | multimap<string, bfd_section *> image_sections; |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 457 | |
| 458 | for (bfd_section * sect = image_bfd->sections; |
| 459 | sect && img_sect_cnt < image_bfd->section_count; |
| 460 | sect = sect->next) { |
| 461 | // A comment section marks the end of the needed sections |
| 462 | if (strstr(sect->name, ".comment") == sect->name) |
| 463 | break; |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame] | 464 | image_sections.insert(pair<string, bfd_section *>(sect->name, sect)); |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 465 | img_sect_cnt++; |
| 466 | } |
| 467 | |
| 468 | asymbol * sym = dbg_syms[0]; |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame] | 469 | string prev_sect_name = ""; |
| 470 | bfd_section * matched_section = NULL; |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 471 | for (int i = 0; i < nr_dbg_syms; sym = dbg_syms[++i]) { |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame] | 472 | bool section_switch; |
| 473 | |
| 474 | if (strcmp(prev_sect_name.c_str(), sym->section->name)) { |
| 475 | section_switch = true; |
| 476 | prev_sect_name = sym->section->name; |
| 477 | } else { |
| 478 | section_switch = false; |
| 479 | } |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 480 | if (sym->section->owner && sym->section->owner == abfd) { |
Jeff Brown | 7a33c86 | 2011-02-02 14:00:44 -0800 | [diff] [blame] | 481 | if (section_switch ) { |
| 482 | matched_section = NULL; |
| 483 | multimap<string, bfd_section *>::iterator it; |
| 484 | pair<multimap<string, bfd_section *>::iterator, |
| 485 | multimap<string, bfd_section *>::iterator> range; |
| 486 | |
| 487 | range = image_sections.equal_range(sym->section->name); |
| 488 | for (it = range.first; it != range.second; it++) { |
| 489 | if ((*it).second->vma == sym->section->vma) { |
| 490 | matched_section = (*it).second; |
| 491 | break; |
| 492 | } |
| 493 | } |
| 494 | } |
| 495 | if (matched_section) { |
| 496 | sym->section = matched_section; |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 497 | sym->the_bfd = image_bfd; |
| 498 | } |
| 499 | } |
| 500 | } |
Mike Dodd | 8cfa702 | 2010-11-17 11:12:26 -0800 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | #if SYNTHESIZE_SYMBOLS |
| 504 | bool bfd_info::get_synth_symbols() |
| 505 | { |
| 506 | extern const bfd_target bfd_elf64_powerpc_vec; |
| 507 | extern const bfd_target bfd_elf64_powerpcle_vec; |
| 508 | bool is_elf64_powerpc_target = (abfd->xvec == &bfd_elf64_powerpc_vec) |
| 509 | || (abfd->xvec == &bfd_elf64_powerpcle_vec); |
| 510 | |
| 511 | if (!is_elf64_powerpc_target) |
| 512 | return false; |
| 513 | |
| 514 | void * buf; |
| 515 | uint tmp; |
| 516 | long nr_mini_syms = bfd_read_minisymbols(abfd, 0, &buf, &tmp); |
| 517 | if (nr_mini_syms < 1) |
| 518 | return false; |
| 519 | |
| 520 | asymbol ** mini_syms = (asymbol **)buf; |
| 521 | buf = NULL; |
| 522 | bfd * synth_bfd; |
| 523 | |
| 524 | /* For ppc64, a debuginfo file by itself does not hold enough symbol |
| 525 | * information for us to properly attribute samples to symbols. If |
| 526 | * the image file's bfd has no symbols (as in a super-stripped library), |
| 527 | * then we need to do the extra processing in translate_debuginfo_syms. |
| 528 | */ |
| 529 | if (image_bfd_info && image_bfd_info->nr_syms == 0) { |
| 530 | translate_debuginfo_syms(mini_syms, nr_mini_syms); |
| 531 | synth_bfd = image_bfd_info->abfd; |
| 532 | } else |
| 533 | synth_bfd = abfd; |
| 534 | |
| 535 | long nr_synth_syms = bfd_get_synthetic_symtab(synth_bfd, |
| 536 | nr_mini_syms, |
| 537 | mini_syms, 0, |
| 538 | NULL, &synth_syms); |
| 539 | |
| 540 | if (nr_synth_syms < 0) { |
| 541 | free(mini_syms); |
| 542 | return false; |
| 543 | } |
| 544 | |
| 545 | cverb << vbfd << "mini_syms: " << dec << nr_mini_syms << hex << endl; |
| 546 | cverb << vbfd << "synth_syms: " << dec << nr_synth_syms << hex << endl; |
| 547 | |
| 548 | nr_syms = nr_mini_syms + nr_synth_syms; |
| 549 | syms.reset(new asymbol *[nr_syms + 1]); |
| 550 | |
| 551 | for (size_t i = 0; i < (size_t)nr_mini_syms; ++i) |
| 552 | syms[i] = mini_syms[i]; |
| 553 | |
| 554 | |
| 555 | for (size_t i = 0; i < (size_t)nr_synth_syms; ++i) |
| 556 | syms[nr_mini_syms + i] = synth_syms + i; |
| 557 | |
| 558 | |
| 559 | free(mini_syms); |
| 560 | |
| 561 | // bfd_canonicalize_symtab does this, so shall we |
| 562 | syms[nr_syms] = NULL; |
| 563 | |
| 564 | return true; |
| 565 | } |
| 566 | #else |
| 567 | bool bfd_info::get_synth_symbols() |
| 568 | { |
| 569 | return false; |
| 570 | } |
| 571 | #endif /* SYNTHESIZE_SYMBOLS */ |
| 572 | |
| 573 | |
| 574 | void bfd_info::get_symbols() |
| 575 | { |
| 576 | if (!abfd) |
| 577 | return; |
| 578 | |
| 579 | cverb << vbfd << "bfd_info::get_symbols() for " |
| 580 | << bfd_get_filename(abfd) << endl; |
| 581 | |
| 582 | if (get_synth_symbols()) |
| 583 | return; |
| 584 | |
| 585 | if (bfd_get_file_flags(abfd) & HAS_SYMS) |
| 586 | nr_syms = bfd_get_symtab_upper_bound(abfd); |
| 587 | |
| 588 | cverb << vbfd << "bfd_get_symtab_upper_bound: " << dec |
| 589 | << nr_syms << hex << endl; |
| 590 | |
| 591 | nr_syms /= sizeof(asymbol *); |
| 592 | |
| 593 | if (nr_syms < 1) |
| 594 | return; |
| 595 | |
| 596 | syms.reset(new asymbol *[nr_syms]); |
| 597 | |
| 598 | nr_syms = bfd_canonicalize_symtab(abfd, syms.get()); |
| 599 | |
| 600 | if (image_bfd_info) |
| 601 | translate_debuginfo_syms(syms.get(), nr_syms); |
| 602 | |
| 603 | cverb << vbfd << "bfd_canonicalize_symtab: " << dec |
| 604 | << nr_syms << hex << endl; |
| 605 | } |
| 606 | |
| 607 | |
| 608 | linenr_info const |
| 609 | find_nearest_line(bfd_info const & b, op_bfd_symbol const & sym, |
| 610 | bfd_vma offset, bool anon_obj) |
| 611 | { |
| 612 | char const * function = ""; |
| 613 | char const * cfilename = ""; |
| 614 | unsigned int linenr = 0; |
| 615 | linenr_info info; |
| 616 | bfd * abfd; |
| 617 | asymbol ** syms; |
| 618 | asection * section; |
| 619 | bfd_vma pc; |
| 620 | bool ret; |
| 621 | |
| 622 | if (!b.valid()) |
| 623 | goto fail; |
| 624 | |
| 625 | // take care about artificial symbol |
| 626 | if (!sym.symbol()) |
| 627 | goto fail; |
| 628 | |
| 629 | abfd = b.abfd; |
| 630 | syms = b.syms.get(); |
| 631 | if (!syms) |
| 632 | goto fail; |
| 633 | section = sym.symbol()->section; |
| 634 | if (anon_obj) |
| 635 | pc = offset - sym.symbol()->section->vma; |
| 636 | else |
| 637 | pc = (sym.value() + offset) - sym.filepos(); |
| 638 | |
| 639 | if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0) |
| 640 | goto fail; |
| 641 | |
| 642 | if (pc >= bfd_section_size(abfd, section)) |
| 643 | goto fail; |
| 644 | |
| 645 | ret = bfd_find_nearest_line(abfd, section, syms, pc, &cfilename, |
| 646 | &function, &linenr); |
| 647 | |
| 648 | if (!ret || !cfilename || !function) |
| 649 | goto fail; |
| 650 | |
| 651 | /* |
| 652 | * is_correct_function does not handle the case of static inlines, |
| 653 | * but if the linenr is non-zero in the inline case, it is the correct |
| 654 | * line number. |
| 655 | */ |
| 656 | if (linenr == 0 && !is_correct_function(function, sym.name())) |
| 657 | goto fail; |
| 658 | |
| 659 | if (linenr == 0) { |
| 660 | fixup_linenr(abfd, section, syms, sym.name(), pc, &cfilename, |
| 661 | &linenr); |
| 662 | } |
| 663 | |
| 664 | info.found = true; |
| 665 | info.filename = cfilename; |
| 666 | info.line = linenr; |
| 667 | return info; |
| 668 | |
| 669 | fail: |
| 670 | info.found = false; |
| 671 | // some stl lacks string::clear() |
| 672 | info.filename.erase(info.filename.begin(), info.filename.end()); |
| 673 | info.line = 0; |
| 674 | return info; |
| 675 | } |