| 1 | /* DWARF 2 support. |
| 2 | Copyright 1994, 95, 96, 97, 98, 1999 Free Software Foundation, Inc. |
| 3 | |
| 4 | Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions |
| 5 | (gavin@cygnus.com). |
| 6 | |
| 7 | From the dwarf2read.c header: |
| 8 | Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, |
| 9 | Inc. with support from Florida State University (under contract |
| 10 | with the Ada Joint Program Office), and Silicon Graphics, Inc. |
| 11 | Initial contribution by Brent Benson, Harris Computer Systems, Inc., |
| 12 | based on Fred Fish's (Cygnus Support) implementation of DWARF 1 |
| 13 | support in dwarfread.c |
| 14 | |
| 15 | This file is part of BFD. |
| 16 | |
| 17 | This program is free software; you can redistribute it and/or modify |
| 18 | it under the terms of the GNU General Public License as published by |
| 19 | the Free Software Foundation; either version 2 of the License, or (at |
| 20 | your option) any later version. |
| 21 | |
| 22 | This program is distributed in the hope that it will be useful, but |
| 23 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 25 | General Public License for more details. |
| 26 | |
| 27 | You should have received a copy of the GNU General Public License |
| 28 | along with this program; if not, write to the Free Software |
| 29 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 30 | |
| 31 | #include "bfd.h" |
| 32 | #include "sysdep.h" |
| 33 | #include "libiberty.h" |
| 34 | #include "libbfd.h" |
| 35 | #include "elf-bfd.h" |
| 36 | #include "elf/dwarf2.h" |
| 37 | |
| 38 | /* The data in the .debug_line statement prologue looks like this. */ |
| 39 | struct line_head |
| 40 | { |
| 41 | unsigned int total_length; |
| 42 | unsigned short version; |
| 43 | unsigned int prologue_length; |
| 44 | unsigned char minimum_instruction_length; |
| 45 | unsigned char default_is_stmt; |
| 46 | int line_base; |
| 47 | unsigned char line_range; |
| 48 | unsigned char opcode_base; |
| 49 | unsigned char *standard_opcode_lengths; |
| 50 | }; |
| 51 | |
| 52 | /* Attributes have a name and a value */ |
| 53 | struct attribute |
| 54 | { |
| 55 | enum dwarf_attribute name; |
| 56 | enum dwarf_form form; |
| 57 | union |
| 58 | { |
| 59 | char *str; |
| 60 | struct dwarf_block *blk; |
| 61 | unsigned int unsnd; |
| 62 | int snd; |
| 63 | bfd_vma addr; |
| 64 | } |
| 65 | u; |
| 66 | }; |
| 67 | |
| 68 | /* Get at parts of an attribute structure */ |
| 69 | |
| 70 | #define DW_STRING(attr) ((attr)->u.str) |
| 71 | #define DW_UNSND(attr) ((attr)->u.unsnd) |
| 72 | #define DW_BLOCK(attr) ((attr)->u.blk) |
| 73 | #define DW_SND(attr) ((attr)->u.snd) |
| 74 | #define DW_ADDR(attr) ((attr)->u.addr) |
| 75 | |
| 76 | /* Blocks are a bunch of untyped bytes. */ |
| 77 | struct dwarf_block |
| 78 | { |
| 79 | unsigned int size; |
| 80 | char *data; |
| 81 | }; |
| 82 | |
| 83 | |
| 84 | struct dwarf2_debug { |
| 85 | |
| 86 | /* A list of all previously read comp_units. */ |
| 87 | struct comp_unit* all_comp_units; |
| 88 | |
| 89 | /* The next unread compilation unit within the .debug_info section. |
| 90 | Zero indicates that the .debug_info section has not been loaded |
| 91 | into a buffer yet.*/ |
| 92 | char* info_ptr; |
| 93 | |
| 94 | /* Pointer to the end of the .debug_info section memory buffer. */ |
| 95 | char* info_ptr_end; |
| 96 | |
| 97 | /* Pointer to the .debug_abbrev section loaded into memory. */ |
| 98 | char* dwarf_abbrev_buffer; |
| 99 | |
| 100 | /* Length of the loaded .debug_abbrev section. */ |
| 101 | unsigned long dwarf_abbrev_size; |
| 102 | |
| 103 | /* Buffer for decode_line_info. */ |
| 104 | char *dwarf_line_buffer; |
| 105 | }; |
| 106 | |
| 107 | struct arange { |
| 108 | struct arange *next; |
| 109 | bfd_vma low; |
| 110 | bfd_vma high; |
| 111 | }; |
| 112 | |
| 113 | |
| 114 | /* A minimal decoding of DWARF2 compilation units. We only decode |
| 115 | what's needed to get to the line number information. */ |
| 116 | |
| 117 | struct comp_unit { |
| 118 | |
| 119 | /* Chain the previously read compilation units. */ |
| 120 | struct comp_unit* next_unit; |
| 121 | |
| 122 | /* Keep the bdf convenient (for memory allocation). */ |
| 123 | bfd* abfd; |
| 124 | |
| 125 | /* The lowest and higest addresses contained in this compilation |
| 126 | unit as specified in the compilation unit header. */ |
| 127 | struct arange arange; |
| 128 | |
| 129 | /* The DW_AT_name attribute (for error messages). */ |
| 130 | char* name; |
| 131 | |
| 132 | /* The abbrev hash table. */ |
| 133 | struct abbrev_info** abbrevs; |
| 134 | |
| 135 | /* Note that an error was found by comp_unit_find_nearest_line. */ |
| 136 | int error; |
| 137 | |
| 138 | /* The DW_AT_comp_dir attribute */ |
| 139 | char* comp_dir; |
| 140 | |
| 141 | /* True if there is a line number table associated with this comp. unit. */ |
| 142 | int stmtlist; |
| 143 | |
| 144 | /* The offset into .debug_line of the line number table. */ |
| 145 | unsigned long line_offset; |
| 146 | |
| 147 | /* Pointer to the first child die for the comp unit. */ |
| 148 | char *first_child_die_ptr; |
| 149 | |
| 150 | /* The end of the comp unit. */ |
| 151 | char *end_ptr; |
| 152 | |
| 153 | /* The decoded line number, NULL if not yet decoded. */ |
| 154 | struct line_info_table* line_table; |
| 155 | |
| 156 | /* A list of the functions found in this comp. unit. */ |
| 157 | struct funcinfo* function_table; |
| 158 | |
| 159 | /* Address size for this unit - from unit header */ |
| 160 | unsigned char addr_size; |
| 161 | }; |
| 162 | |
| 163 | |
| 164 | |
| 165 | /* VERBATIM |
| 166 | The following function up to the END VERBATIM mark are |
| 167 | copied directly from dwarf2read.c. */ |
| 168 | |
| 169 | /* read dwarf information from a buffer */ |
| 170 | |
| 171 | static unsigned int |
| 172 | read_1_byte (abfd, buf) |
| 173 | bfd *abfd ATTRIBUTE_UNUSED; |
| 174 | char *buf; |
| 175 | { |
| 176 | return bfd_get_8 (abfd, (bfd_byte *) buf); |
| 177 | } |
| 178 | |
| 179 | static int |
| 180 | read_1_signed_byte (abfd, buf) |
| 181 | bfd *abfd ATTRIBUTE_UNUSED; |
| 182 | char *buf; |
| 183 | { |
| 184 | return bfd_get_signed_8 (abfd, (bfd_byte *) buf); |
| 185 | } |
| 186 | |
| 187 | static unsigned int |
| 188 | read_2_bytes (abfd, buf) |
| 189 | bfd *abfd; |
| 190 | char *buf; |
| 191 | { |
| 192 | return bfd_get_16 (abfd, (bfd_byte *) buf); |
| 193 | } |
| 194 | |
| 195 | #if 0 |
| 196 | |
| 197 | /* This is not used. */ |
| 198 | |
| 199 | static int |
| 200 | read_2_signed_bytes (abfd, buf) |
| 201 | bfd *abfd; |
| 202 | char *buf; |
| 203 | { |
| 204 | return bfd_get_signed_16 (abfd, (bfd_byte *) buf); |
| 205 | } |
| 206 | |
| 207 | #endif |
| 208 | |
| 209 | static unsigned int |
| 210 | read_4_bytes (abfd, buf) |
| 211 | bfd *abfd; |
| 212 | char *buf; |
| 213 | { |
| 214 | return bfd_get_32 (abfd, (bfd_byte *) buf); |
| 215 | } |
| 216 | |
| 217 | #if 0 |
| 218 | |
| 219 | /* This is not used. */ |
| 220 | |
| 221 | static int |
| 222 | read_4_signed_bytes (abfd, buf) |
| 223 | bfd *abfd; |
| 224 | char *buf; |
| 225 | { |
| 226 | return bfd_get_signed_32 (abfd, (bfd_byte *) buf); |
| 227 | } |
| 228 | |
| 229 | #endif |
| 230 | |
| 231 | static unsigned int |
| 232 | read_8_bytes (abfd, buf) |
| 233 | bfd *abfd; |
| 234 | char *buf; |
| 235 | { |
| 236 | return bfd_get_64 (abfd, (bfd_byte *) buf); |
| 237 | } |
| 238 | |
| 239 | static char * |
| 240 | read_n_bytes (abfd, buf, size) |
| 241 | bfd *abfd ATTRIBUTE_UNUSED; |
| 242 | char *buf; |
| 243 | unsigned int size ATTRIBUTE_UNUSED; |
| 244 | { |
| 245 | /* If the size of a host char is 8 bits, we can return a pointer |
| 246 | to the buffer, otherwise we have to copy the data to a buffer |
| 247 | allocated on the temporary obstack. */ |
| 248 | return buf; |
| 249 | } |
| 250 | |
| 251 | static char * |
| 252 | read_string (abfd, buf, bytes_read_ptr) |
| 253 | bfd *abfd ATTRIBUTE_UNUSED; |
| 254 | char *buf; |
| 255 | unsigned int *bytes_read_ptr; |
| 256 | { |
| 257 | /* If the size of a host char is 8 bits, we can return a pointer |
| 258 | to the string, otherwise we have to copy the string to a buffer |
| 259 | allocated on the temporary obstack. */ |
| 260 | if (*buf == '\0') |
| 261 | { |
| 262 | *bytes_read_ptr = 1; |
| 263 | return NULL; |
| 264 | } |
| 265 | *bytes_read_ptr = strlen (buf) + 1; |
| 266 | return buf; |
| 267 | } |
| 268 | |
| 269 | static unsigned int |
| 270 | read_unsigned_leb128 (abfd, buf, bytes_read_ptr) |
| 271 | bfd *abfd ATTRIBUTE_UNUSED; |
| 272 | char *buf; |
| 273 | unsigned int *bytes_read_ptr; |
| 274 | { |
| 275 | unsigned int result; |
| 276 | unsigned int num_read; |
| 277 | int shift; |
| 278 | unsigned char byte; |
| 279 | |
| 280 | result = 0; |
| 281 | shift = 0; |
| 282 | num_read = 0; |
| 283 | |
| 284 | do |
| 285 | { |
| 286 | byte = bfd_get_8 (abfd, (bfd_byte *) buf); |
| 287 | buf ++; |
| 288 | num_read ++; |
| 289 | result |= ((byte & 0x7f) << shift); |
| 290 | shift += 7; |
| 291 | } |
| 292 | while (byte & 0x80); |
| 293 | |
| 294 | * bytes_read_ptr = num_read; |
| 295 | |
| 296 | return result; |
| 297 | } |
| 298 | |
| 299 | static int |
| 300 | read_signed_leb128 (abfd, buf, bytes_read_ptr) |
| 301 | bfd *abfd ATTRIBUTE_UNUSED; |
| 302 | char *buf; |
| 303 | unsigned int * bytes_read_ptr; |
| 304 | { |
| 305 | int result; |
| 306 | int shift; |
| 307 | int num_read; |
| 308 | unsigned char byte; |
| 309 | |
| 310 | result = 0; |
| 311 | shift = 0; |
| 312 | num_read = 0; |
| 313 | |
| 314 | do |
| 315 | { |
| 316 | byte = bfd_get_8 (abfd, (bfd_byte *) buf); |
| 317 | buf ++; |
| 318 | num_read ++; |
| 319 | result |= ((byte & 0x7f) << shift); |
| 320 | shift += 7; |
| 321 | } |
| 322 | while (byte & 0x80); |
| 323 | |
| 324 | if ((shift < 32) && (byte & 0x40)) |
| 325 | result |= -(1 << shift); |
| 326 | |
| 327 | * bytes_read_ptr = num_read; |
| 328 | |
| 329 | return result; |
| 330 | } |
| 331 | |
| 332 | /* END VERBATIM */ |
| 333 | |
| 334 | static bfd_vma |
| 335 | read_address (unit, buf) |
| 336 | struct comp_unit* unit; |
| 337 | char *buf; |
| 338 | { |
| 339 | bfd_vma retval = 0; |
| 340 | |
| 341 | if (unit->addr_size == 4) |
| 342 | { |
| 343 | retval = bfd_get_32 (unit->abfd, (bfd_byte *) buf); |
| 344 | } else { |
| 345 | retval = bfd_get_64 (unit->abfd, (bfd_byte *) buf); |
| 346 | } |
| 347 | return retval; |
| 348 | } |
| 349 | |
| 350 | |
| 351 | |
| 352 | |
| 353 | |
| 354 | /* This data structure holds the information of an abbrev. */ |
| 355 | struct abbrev_info |
| 356 | { |
| 357 | unsigned int number; /* number identifying abbrev */ |
| 358 | enum dwarf_tag tag; /* dwarf tag */ |
| 359 | int has_children; /* boolean */ |
| 360 | unsigned int num_attrs; /* number of attributes */ |
| 361 | struct attr_abbrev *attrs; /* an array of attribute descriptions */ |
| 362 | struct abbrev_info *next; /* next in chain */ |
| 363 | }; |
| 364 | |
| 365 | struct attr_abbrev |
| 366 | { |
| 367 | enum dwarf_attribute name; |
| 368 | enum dwarf_form form; |
| 369 | }; |
| 370 | |
| 371 | #ifndef ABBREV_HASH_SIZE |
| 372 | #define ABBREV_HASH_SIZE 121 |
| 373 | #endif |
| 374 | #ifndef ATTR_ALLOC_CHUNK |
| 375 | #define ATTR_ALLOC_CHUNK 4 |
| 376 | #endif |
| 377 | |
| 378 | /* Lookup an abbrev_info structure in the abbrev hash table. */ |
| 379 | |
| 380 | static struct abbrev_info * |
| 381 | lookup_abbrev (number,abbrevs) |
| 382 | unsigned int number; |
| 383 | struct abbrev_info **abbrevs; |
| 384 | { |
| 385 | unsigned int hash_number; |
| 386 | struct abbrev_info *abbrev; |
| 387 | |
| 388 | hash_number = number % ABBREV_HASH_SIZE; |
| 389 | abbrev = abbrevs[hash_number]; |
| 390 | |
| 391 | while (abbrev) |
| 392 | { |
| 393 | if (abbrev->number == number) |
| 394 | return abbrev; |
| 395 | else |
| 396 | abbrev = abbrev->next; |
| 397 | } |
| 398 | return NULL; |
| 399 | } |
| 400 | |
| 401 | /* In DWARF version 2, the description of the debugging information is |
| 402 | stored in a separate .debug_abbrev section. Before we read any |
| 403 | dies from a section we read in all abbreviations and install them |
| 404 | in a hash table. */ |
| 405 | |
| 406 | static struct abbrev_info** |
| 407 | read_abbrevs (abfd, offset) |
| 408 | bfd * abfd; |
| 409 | unsigned int offset; |
| 410 | { |
| 411 | struct abbrev_info **abbrevs; |
| 412 | char *abbrev_ptr; |
| 413 | struct abbrev_info *cur_abbrev; |
| 414 | unsigned int abbrev_number, bytes_read, abbrev_name; |
| 415 | unsigned int abbrev_form, hash_number; |
| 416 | struct dwarf2_debug *stash; |
| 417 | |
| 418 | stash = elf_tdata(abfd)->dwarf2_find_line_info; |
| 419 | |
| 420 | if (! stash->dwarf_abbrev_buffer) |
| 421 | { |
| 422 | asection *msec; |
| 423 | |
| 424 | msec = bfd_get_section_by_name (abfd, ".debug_abbrev"); |
| 425 | if (! msec) |
| 426 | { |
| 427 | (*_bfd_error_handler) (_("Dwarf Error: Can't find .debug_abbrev section.")); |
| 428 | bfd_set_error (bfd_error_bad_value); |
| 429 | return 0; |
| 430 | } |
| 431 | |
| 432 | stash->dwarf_abbrev_size = bfd_get_section_size_before_reloc (msec); |
| 433 | stash->dwarf_abbrev_buffer = (char*) bfd_alloc (abfd, stash->dwarf_abbrev_size); |
| 434 | if (! stash->dwarf_abbrev_buffer) |
| 435 | return 0; |
| 436 | |
| 437 | if (! bfd_get_section_contents (abfd, msec, |
| 438 | stash->dwarf_abbrev_buffer, 0, |
| 439 | stash->dwarf_abbrev_size)) |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | if (offset > stash->dwarf_abbrev_size) |
| 444 | { |
| 445 | (*_bfd_error_handler) (_("Dwarf Error: Abbrev offset (%u) bigger than abbrev size (%u)."), |
| 446 | offset, stash->dwarf_abbrev_size ); |
| 447 | bfd_set_error (bfd_error_bad_value); |
| 448 | return 0; |
| 449 | } |
| 450 | |
| 451 | abbrevs = (struct abbrev_info**) bfd_zalloc (abfd, sizeof(struct abbrev_info*) * ABBREV_HASH_SIZE); |
| 452 | |
| 453 | abbrev_ptr = stash->dwarf_abbrev_buffer + offset; |
| 454 | abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| 455 | abbrev_ptr += bytes_read; |
| 456 | |
| 457 | /* loop until we reach an abbrev number of 0 */ |
| 458 | while (abbrev_number) |
| 459 | { |
| 460 | cur_abbrev = (struct abbrev_info*)bfd_zalloc (abfd, sizeof (struct abbrev_info)); |
| 461 | |
| 462 | /* read in abbrev header */ |
| 463 | cur_abbrev->number = abbrev_number; |
| 464 | cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| 465 | abbrev_ptr += bytes_read; |
| 466 | cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr); |
| 467 | abbrev_ptr += 1; |
| 468 | |
| 469 | /* now read in declarations */ |
| 470 | abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| 471 | abbrev_ptr += bytes_read; |
| 472 | abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| 473 | abbrev_ptr += bytes_read; |
| 474 | while (abbrev_name) |
| 475 | { |
| 476 | if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0) |
| 477 | { |
| 478 | cur_abbrev->attrs = (struct attr_abbrev *) |
| 479 | bfd_realloc (cur_abbrev->attrs, |
| 480 | (cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK) |
| 481 | * sizeof (struct attr_abbrev)); |
| 482 | if (! cur_abbrev->attrs) |
| 483 | return 0; |
| 484 | } |
| 485 | cur_abbrev->attrs[cur_abbrev->num_attrs].name = abbrev_name; |
| 486 | cur_abbrev->attrs[cur_abbrev->num_attrs++].form = abbrev_form; |
| 487 | abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| 488 | abbrev_ptr += bytes_read; |
| 489 | abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| 490 | abbrev_ptr += bytes_read; |
| 491 | } |
| 492 | |
| 493 | hash_number = abbrev_number % ABBREV_HASH_SIZE; |
| 494 | cur_abbrev->next = abbrevs[hash_number]; |
| 495 | abbrevs[hash_number] = cur_abbrev; |
| 496 | |
| 497 | /* Get next abbreviation. |
| 498 | Under Irix6 the abbreviations for a compilation unit are not |
| 499 | always properly terminated with an abbrev number of 0. |
| 500 | Exit loop if we encounter an abbreviation which we have |
| 501 | already read (which means we are about to read the abbreviations |
| 502 | for the next compile unit) or if the end of the abbreviation |
| 503 | table is reached. */ |
| 504 | if ((unsigned int) (abbrev_ptr - stash->dwarf_abbrev_buffer) |
| 505 | >= stash->dwarf_abbrev_size) |
| 506 | break; |
| 507 | abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| 508 | abbrev_ptr += bytes_read; |
| 509 | if (lookup_abbrev (abbrev_number,abbrevs) != NULL) |
| 510 | break; |
| 511 | } |
| 512 | |
| 513 | return abbrevs; |
| 514 | } |
| 515 | |
| 516 | /* Read an attribute described by an abbreviated attribute. */ |
| 517 | |
| 518 | static char * |
| 519 | read_attribute (attr, abbrev, unit, info_ptr) |
| 520 | struct attribute *attr; |
| 521 | struct attr_abbrev *abbrev; |
| 522 | struct comp_unit *unit; |
| 523 | char *info_ptr; |
| 524 | { |
| 525 | bfd *abfd = unit->abfd; |
| 526 | unsigned int bytes_read; |
| 527 | struct dwarf_block *blk; |
| 528 | |
| 529 | attr->name = abbrev->name; |
| 530 | attr->form = abbrev->form; |
| 531 | switch (abbrev->form) |
| 532 | { |
| 533 | case DW_FORM_addr: |
| 534 | case DW_FORM_ref_addr: |
| 535 | DW_ADDR (attr) = read_address (unit, info_ptr); |
| 536 | info_ptr += unit->addr_size; |
| 537 | break; |
| 538 | case DW_FORM_block2: |
| 539 | blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block)); |
| 540 | blk->size = read_2_bytes (abfd, info_ptr); |
| 541 | info_ptr += 2; |
| 542 | blk->data = read_n_bytes (abfd, info_ptr, blk->size); |
| 543 | info_ptr += blk->size; |
| 544 | DW_BLOCK (attr) = blk; |
| 545 | break; |
| 546 | case DW_FORM_block4: |
| 547 | blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block)); |
| 548 | blk->size = read_4_bytes (abfd, info_ptr); |
| 549 | info_ptr += 4; |
| 550 | blk->data = read_n_bytes (abfd, info_ptr, blk->size); |
| 551 | info_ptr += blk->size; |
| 552 | DW_BLOCK (attr) = blk; |
| 553 | break; |
| 554 | case DW_FORM_data2: |
| 555 | DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); |
| 556 | info_ptr += 2; |
| 557 | break; |
| 558 | case DW_FORM_data4: |
| 559 | DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); |
| 560 | info_ptr += 4; |
| 561 | break; |
| 562 | case DW_FORM_data8: |
| 563 | DW_UNSND (attr) = read_8_bytes (abfd, info_ptr); |
| 564 | info_ptr += 8; |
| 565 | break; |
| 566 | case DW_FORM_string: |
| 567 | DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read); |
| 568 | info_ptr += bytes_read; |
| 569 | break; |
| 570 | case DW_FORM_block: |
| 571 | blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block)); |
| 572 | blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| 573 | info_ptr += bytes_read; |
| 574 | blk->data = read_n_bytes (abfd, info_ptr, blk->size); |
| 575 | info_ptr += blk->size; |
| 576 | DW_BLOCK (attr) = blk; |
| 577 | break; |
| 578 | case DW_FORM_block1: |
| 579 | blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block)); |
| 580 | blk->size = read_1_byte (abfd, info_ptr); |
| 581 | info_ptr += 1; |
| 582 | blk->data = read_n_bytes (abfd, info_ptr, blk->size); |
| 583 | info_ptr += blk->size; |
| 584 | DW_BLOCK (attr) = blk; |
| 585 | break; |
| 586 | case DW_FORM_data1: |
| 587 | DW_UNSND (attr) = read_1_byte (abfd, info_ptr); |
| 588 | info_ptr += 1; |
| 589 | break; |
| 590 | case DW_FORM_flag: |
| 591 | DW_UNSND (attr) = read_1_byte (abfd, info_ptr); |
| 592 | info_ptr += 1; |
| 593 | break; |
| 594 | case DW_FORM_sdata: |
| 595 | DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read); |
| 596 | info_ptr += bytes_read; |
| 597 | break; |
| 598 | case DW_FORM_udata: |
| 599 | DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| 600 | info_ptr += bytes_read; |
| 601 | break; |
| 602 | case DW_FORM_ref1: |
| 603 | DW_UNSND (attr) = read_1_byte (abfd, info_ptr); |
| 604 | info_ptr += 1; |
| 605 | break; |
| 606 | case DW_FORM_ref2: |
| 607 | DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); |
| 608 | info_ptr += 2; |
| 609 | break; |
| 610 | case DW_FORM_ref4: |
| 611 | DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); |
| 612 | info_ptr += 4; |
| 613 | break; |
| 614 | case DW_FORM_ref_udata: |
| 615 | DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| 616 | info_ptr += bytes_read; |
| 617 | break; |
| 618 | case DW_FORM_strp: |
| 619 | case DW_FORM_indirect: |
| 620 | default: |
| 621 | (*_bfd_error_handler) (_("Dwarf Error: Invalid or unhandled FORM value: %d."), |
| 622 | abbrev->form); |
| 623 | bfd_set_error (bfd_error_bad_value); |
| 624 | } |
| 625 | return info_ptr; |
| 626 | } |
| 627 | |
| 628 | |
| 629 | /* Source line information table routines. */ |
| 630 | |
| 631 | #define FILE_ALLOC_CHUNK 5 |
| 632 | #define DIR_ALLOC_CHUNK 5 |
| 633 | |
| 634 | struct line_info { |
| 635 | struct line_info* prev_line; |
| 636 | |
| 637 | bfd_vma address; |
| 638 | char* filename; |
| 639 | unsigned int line; |
| 640 | unsigned int column; |
| 641 | int end_sequence; /* end of (sequential) code sequence */ |
| 642 | }; |
| 643 | |
| 644 | struct fileinfo { |
| 645 | char *name; |
| 646 | unsigned int dir; |
| 647 | unsigned int time; |
| 648 | unsigned int size; |
| 649 | }; |
| 650 | |
| 651 | struct line_info_table { |
| 652 | bfd* abfd; |
| 653 | |
| 654 | unsigned int num_files; |
| 655 | unsigned int num_dirs; |
| 656 | |
| 657 | char* comp_dir; |
| 658 | char** dirs; |
| 659 | struct fileinfo* files; |
| 660 | struct line_info* last_line; |
| 661 | }; |
| 662 | |
| 663 | static void |
| 664 | add_line_info (table, address, filename, line, column, end_sequence) |
| 665 | struct line_info_table* table; |
| 666 | bfd_vma address; |
| 667 | char* filename; |
| 668 | unsigned int line; |
| 669 | unsigned int column; |
| 670 | int end_sequence; |
| 671 | { |
| 672 | struct line_info* info = (struct line_info*) |
| 673 | bfd_alloc (table->abfd, sizeof (struct line_info)); |
| 674 | |
| 675 | info->prev_line = table->last_line; |
| 676 | table->last_line = info; |
| 677 | |
| 678 | info->address = address; |
| 679 | info->filename = filename; |
| 680 | info->line = line; |
| 681 | info->column = column; |
| 682 | info->end_sequence = end_sequence; |
| 683 | } |
| 684 | |
| 685 | static char* |
| 686 | concat_filename (table, file) |
| 687 | struct line_info_table* table; |
| 688 | unsigned int file; |
| 689 | { |
| 690 | char* filename; |
| 691 | |
| 692 | if (file - 1 >= table->num_files) |
| 693 | { |
| 694 | (*_bfd_error_handler) (_("Dwarf Error: mangled line number " |
| 695 | "section (bad file number).")); |
| 696 | return "<unknown>"; |
| 697 | } |
| 698 | |
| 699 | filename = table->files[file - 1].name; |
| 700 | if (*filename == '/') |
| 701 | return filename; |
| 702 | |
| 703 | else |
| 704 | { |
| 705 | char* dirname = (table->files[file - 1].dir |
| 706 | ? table->dirs[table->files[file - 1].dir - 1] |
| 707 | : table->comp_dir); |
| 708 | return (char*) concat (dirname, "/", filename, NULL); |
| 709 | } |
| 710 | } |
| 711 | |
| 712 | static void |
| 713 | arange_add (unit, low_pc, high_pc) |
| 714 | struct comp_unit *unit; |
| 715 | bfd_vma low_pc; |
| 716 | bfd_vma high_pc; |
| 717 | { |
| 718 | struct arange *arange; |
| 719 | |
| 720 | /* first see if we can cheaply extend an existing range: */ |
| 721 | arange = &unit->arange; |
| 722 | do |
| 723 | { |
| 724 | if (low_pc == arange->high) |
| 725 | { |
| 726 | arange->high = high_pc; |
| 727 | return; |
| 728 | } |
| 729 | if (high_pc == arange->low) |
| 730 | { |
| 731 | arange->low = low_pc; |
| 732 | return; |
| 733 | } |
| 734 | arange = arange->next; |
| 735 | } |
| 736 | while (arange); |
| 737 | |
| 738 | if (unit->arange.high == 0) |
| 739 | { |
| 740 | /* this is the first address range: store it in unit->arange: */ |
| 741 | unit->arange.next = 0; |
| 742 | unit->arange.low = low_pc; |
| 743 | unit->arange.high = high_pc; |
| 744 | return; |
| 745 | } |
| 746 | |
| 747 | /* need to allocate a new arange and insert it into the arange list: */ |
| 748 | arange = bfd_zalloc (unit->abfd, sizeof (*arange)); |
| 749 | arange->low = low_pc; |
| 750 | arange->high = high_pc; |
| 751 | |
| 752 | arange->next = unit->arange.next; |
| 753 | unit->arange.next = arange; |
| 754 | } |
| 755 | |
| 756 | /* Decode the line number information for UNIT. */ |
| 757 | |
| 758 | static struct line_info_table* |
| 759 | decode_line_info (unit) |
| 760 | struct comp_unit *unit; |
| 761 | { |
| 762 | bfd *abfd = unit->abfd; |
| 763 | |
| 764 | struct dwarf2_debug *stash; |
| 765 | |
| 766 | struct line_info_table* table; |
| 767 | |
| 768 | char *line_ptr; |
| 769 | char *line_end; |
| 770 | struct line_head lh; |
| 771 | unsigned int i, bytes_read; |
| 772 | char *cur_file, *cur_dir; |
| 773 | unsigned char op_code, extended_op, adj_opcode; |
| 774 | |
| 775 | stash = elf_tdata (abfd)->dwarf2_find_line_info; |
| 776 | |
| 777 | if (! stash->dwarf_line_buffer) |
| 778 | { |
| 779 | asection *msec; |
| 780 | unsigned long size; |
| 781 | |
| 782 | msec = bfd_get_section_by_name (abfd, ".debug_line"); |
| 783 | if (! msec) |
| 784 | { |
| 785 | (*_bfd_error_handler) (_("Dwarf Error: Can't find .debug_line section.")); |
| 786 | bfd_set_error (bfd_error_bad_value); |
| 787 | return 0; |
| 788 | } |
| 789 | |
| 790 | size = bfd_get_section_size_before_reloc (msec); |
| 791 | stash->dwarf_line_buffer = (char *) bfd_alloc (abfd, size); |
| 792 | if (! stash->dwarf_line_buffer) |
| 793 | return 0; |
| 794 | |
| 795 | if (! bfd_get_section_contents (abfd, msec, |
| 796 | stash->dwarf_line_buffer, 0, |
| 797 | size)) |
| 798 | return 0; |
| 799 | |
| 800 | /* FIXME: We ought to apply the relocs against this section before |
| 801 | we process it.... */ |
| 802 | } |
| 803 | |
| 804 | table = (struct line_info_table*) bfd_alloc (abfd, |
| 805 | sizeof (struct line_info_table)); |
| 806 | table->abfd = abfd; |
| 807 | table->comp_dir = unit->comp_dir; |
| 808 | |
| 809 | table->num_files = 0; |
| 810 | table->files = NULL; |
| 811 | |
| 812 | table->num_dirs = 0; |
| 813 | table->dirs = NULL; |
| 814 | |
| 815 | table->files = NULL; |
| 816 | table->last_line = NULL; |
| 817 | |
| 818 | line_ptr = stash->dwarf_line_buffer + unit->line_offset; |
| 819 | |
| 820 | /* read in the prologue */ |
| 821 | lh.total_length = read_4_bytes (abfd, line_ptr); |
| 822 | line_ptr += 4; |
| 823 | line_end = line_ptr + lh.total_length; |
| 824 | lh.version = read_2_bytes (abfd, line_ptr); |
| 825 | line_ptr += 2; |
| 826 | lh.prologue_length = read_4_bytes (abfd, line_ptr); |
| 827 | line_ptr += 4; |
| 828 | lh.minimum_instruction_length = read_1_byte (abfd, line_ptr); |
| 829 | line_ptr += 1; |
| 830 | lh.default_is_stmt = read_1_byte (abfd, line_ptr); |
| 831 | line_ptr += 1; |
| 832 | lh.line_base = read_1_signed_byte (abfd, line_ptr); |
| 833 | line_ptr += 1; |
| 834 | lh.line_range = read_1_byte (abfd, line_ptr); |
| 835 | line_ptr += 1; |
| 836 | lh.opcode_base = read_1_byte (abfd, line_ptr); |
| 837 | line_ptr += 1; |
| 838 | lh.standard_opcode_lengths = (unsigned char *) |
| 839 | bfd_alloc (abfd, lh.opcode_base * sizeof (unsigned char)); |
| 840 | |
| 841 | lh.standard_opcode_lengths[0] = 1; |
| 842 | for (i = 1; i < lh.opcode_base; ++i) |
| 843 | { |
| 844 | lh.standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr); |
| 845 | line_ptr += 1; |
| 846 | } |
| 847 | |
| 848 | /* Read directory table */ |
| 849 | while ((cur_dir = read_string (abfd, line_ptr, &bytes_read)) != NULL) |
| 850 | { |
| 851 | line_ptr += bytes_read; |
| 852 | if ((table->num_dirs % DIR_ALLOC_CHUNK) == 0) |
| 853 | { |
| 854 | table->dirs = (char **) |
| 855 | bfd_realloc (table->dirs, |
| 856 | (table->num_dirs + DIR_ALLOC_CHUNK) * sizeof (char *)); |
| 857 | if (! table->dirs) |
| 858 | return 0; |
| 859 | } |
| 860 | table->dirs[table->num_dirs++] = cur_dir; |
| 861 | } |
| 862 | line_ptr += bytes_read; |
| 863 | |
| 864 | /* Read file name table */ |
| 865 | while ((cur_file = read_string (abfd, line_ptr, &bytes_read)) != NULL) |
| 866 | { |
| 867 | line_ptr += bytes_read; |
| 868 | if ((table->num_files % FILE_ALLOC_CHUNK) == 0) |
| 869 | { |
| 870 | table->files = (struct fileinfo *) |
| 871 | bfd_realloc (table->files, |
| 872 | (table->num_files + FILE_ALLOC_CHUNK) |
| 873 | * sizeof (struct fileinfo)); |
| 874 | if (! table->files) |
| 875 | return 0; |
| 876 | } |
| 877 | table->files[table->num_files].name = cur_file; |
| 878 | table->files[table->num_files].dir = |
| 879 | read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 880 | line_ptr += bytes_read; |
| 881 | table->files[table->num_files].time = |
| 882 | read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 883 | line_ptr += bytes_read; |
| 884 | table->files[table->num_files].size = |
| 885 | read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 886 | line_ptr += bytes_read; |
| 887 | table->num_files++; |
| 888 | } |
| 889 | line_ptr += bytes_read; |
| 890 | |
| 891 | /* Read the statement sequences until there's nothing left. */ |
| 892 | while (line_ptr < line_end) |
| 893 | { |
| 894 | /* state machine registers */ |
| 895 | bfd_vma address = 0; |
| 896 | char* filename = concat_filename (table, 1); |
| 897 | unsigned int line = 1; |
| 898 | unsigned int column = 0; |
| 899 | int is_stmt = lh.default_is_stmt; |
| 900 | int basic_block = 0; |
| 901 | int end_sequence = 0, need_low_pc = 1; |
| 902 | bfd_vma low_pc = 0; |
| 903 | |
| 904 | /* Decode the table. */ |
| 905 | while (! end_sequence) |
| 906 | { |
| 907 | op_code = read_1_byte (abfd, line_ptr); |
| 908 | line_ptr += 1; |
| 909 | switch (op_code) |
| 910 | { |
| 911 | case DW_LNS_extended_op: |
| 912 | line_ptr += 1; /* ignore length */ |
| 913 | extended_op = read_1_byte (abfd, line_ptr); |
| 914 | line_ptr += 1; |
| 915 | switch (extended_op) |
| 916 | { |
| 917 | case DW_LNE_end_sequence: |
| 918 | end_sequence = 1; |
| 919 | add_line_info (table, address, filename, line, column, |
| 920 | end_sequence); |
| 921 | if (need_low_pc) |
| 922 | { |
| 923 | need_low_pc = 0; |
| 924 | low_pc = address; |
| 925 | } |
| 926 | arange_add (unit, low_pc, address); |
| 927 | break; |
| 928 | case DW_LNE_set_address: |
| 929 | address = read_address (unit, line_ptr); |
| 930 | line_ptr += unit->addr_size; |
| 931 | break; |
| 932 | case DW_LNE_define_file: |
| 933 | cur_file = read_string (abfd, line_ptr, &bytes_read); |
| 934 | line_ptr += bytes_read; |
| 935 | if ((table->num_files % FILE_ALLOC_CHUNK) == 0) |
| 936 | { |
| 937 | table->files = (struct fileinfo *) |
| 938 | bfd_realloc (table->files, |
| 939 | (table->num_files + FILE_ALLOC_CHUNK) |
| 940 | * sizeof (struct fileinfo)); |
| 941 | if (! table->files) |
| 942 | return 0; |
| 943 | } |
| 944 | table->files[table->num_files].name = cur_file; |
| 945 | table->files[table->num_files].dir = |
| 946 | read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 947 | line_ptr += bytes_read; |
| 948 | table->files[table->num_files].time = |
| 949 | read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 950 | line_ptr += bytes_read; |
| 951 | table->files[table->num_files].size = |
| 952 | read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 953 | line_ptr += bytes_read; |
| 954 | table->num_files++; |
| 955 | break; |
| 956 | default: |
| 957 | (*_bfd_error_handler) (_("Dwarf Error: mangled line number section.")); |
| 958 | bfd_set_error (bfd_error_bad_value); |
| 959 | return 0; |
| 960 | } |
| 961 | break; |
| 962 | case DW_LNS_copy: |
| 963 | add_line_info (table, address, filename, line, column, 0); |
| 964 | basic_block = 0; |
| 965 | if (need_low_pc) |
| 966 | { |
| 967 | need_low_pc = 0; |
| 968 | low_pc = address; |
| 969 | } |
| 970 | break; |
| 971 | case DW_LNS_advance_pc: |
| 972 | address += lh.minimum_instruction_length |
| 973 | * read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 974 | line_ptr += bytes_read; |
| 975 | break; |
| 976 | case DW_LNS_advance_line: |
| 977 | line += read_signed_leb128 (abfd, line_ptr, &bytes_read); |
| 978 | line_ptr += bytes_read; |
| 979 | break; |
| 980 | case DW_LNS_set_file: |
| 981 | { |
| 982 | unsigned int file; |
| 983 | |
| 984 | /* The file and directory tables are 0 based, the references |
| 985 | are 1 based. */ |
| 986 | file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 987 | line_ptr += bytes_read; |
| 988 | filename = concat_filename (table, file); |
| 989 | break; |
| 990 | } |
| 991 | case DW_LNS_set_column: |
| 992 | column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| 993 | line_ptr += bytes_read; |
| 994 | break; |
| 995 | case DW_LNS_negate_stmt: |
| 996 | is_stmt = (!is_stmt); |
| 997 | break; |
| 998 | case DW_LNS_set_basic_block: |
| 999 | basic_block = 1; |
| 1000 | break; |
| 1001 | case DW_LNS_const_add_pc: |
| 1002 | address += lh.minimum_instruction_length |
| 1003 | * ((255 - lh.opcode_base) / lh.line_range); |
| 1004 | break; |
| 1005 | case DW_LNS_fixed_advance_pc: |
| 1006 | address += read_2_bytes (abfd, line_ptr); |
| 1007 | line_ptr += 2; |
| 1008 | break; |
| 1009 | default: /* special operand */ |
| 1010 | adj_opcode = op_code - lh.opcode_base; |
| 1011 | address += (adj_opcode / lh.line_range) |
| 1012 | * lh.minimum_instruction_length; |
| 1013 | line += lh.line_base + (adj_opcode % lh.line_range); |
| 1014 | /* append row to matrix using current values */ |
| 1015 | add_line_info (table, address, filename, line, column, 0); |
| 1016 | basic_block = 1; |
| 1017 | if (need_low_pc) |
| 1018 | { |
| 1019 | need_low_pc = 0; |
| 1020 | low_pc = address; |
| 1021 | } |
| 1022 | } |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | return table; |
| 1027 | } |
| 1028 | |
| 1029 | |
| 1030 | /* If ADDR is within TABLE set the output parameters and return true, |
| 1031 | otherwise return false. The output parameters, FILENAME_PTR and |
| 1032 | LINENUMBER_PTR, are pointers to the objects to be filled in. */ |
| 1033 | |
| 1034 | static boolean |
| 1035 | lookup_address_in_line_info_table (table, |
| 1036 | addr, |
| 1037 | filename_ptr, |
| 1038 | linenumber_ptr) |
| 1039 | struct line_info_table* table; |
| 1040 | bfd_vma addr; |
| 1041 | const char **filename_ptr; |
| 1042 | unsigned int *linenumber_ptr; |
| 1043 | { |
| 1044 | struct line_info* next_line = table->last_line; |
| 1045 | struct line_info* each_line; |
| 1046 | |
| 1047 | if (!next_line) |
| 1048 | return false; |
| 1049 | |
| 1050 | each_line = next_line->prev_line; |
| 1051 | |
| 1052 | while (each_line && next_line) |
| 1053 | { |
| 1054 | if (!each_line->end_sequence |
| 1055 | && addr >= each_line->address && addr < next_line->address) |
| 1056 | { |
| 1057 | *filename_ptr = each_line->filename; |
| 1058 | *linenumber_ptr = each_line->line; |
| 1059 | return true; |
| 1060 | } |
| 1061 | next_line = each_line; |
| 1062 | each_line = each_line->prev_line; |
| 1063 | } |
| 1064 | |
| 1065 | return false; |
| 1066 | } |
| 1067 | |
| 1068 | |
| 1069 | |
| 1070 | |
| 1071 | /* Function table functions. */ |
| 1072 | |
| 1073 | struct funcinfo { |
| 1074 | struct funcinfo *prev_func; |
| 1075 | |
| 1076 | char* name; |
| 1077 | bfd_vma low; |
| 1078 | bfd_vma high; |
| 1079 | }; |
| 1080 | |
| 1081 | |
| 1082 | /* If ADDR is within TABLE, set FUNCTIONNAME_PTR, and return true. */ |
| 1083 | |
| 1084 | static boolean |
| 1085 | lookup_address_in_function_table (table, |
| 1086 | addr, |
| 1087 | functionname_ptr) |
| 1088 | struct funcinfo* table; |
| 1089 | bfd_vma addr; |
| 1090 | const char **functionname_ptr; |
| 1091 | { |
| 1092 | struct funcinfo* each_func; |
| 1093 | |
| 1094 | for (each_func = table; |
| 1095 | each_func; |
| 1096 | each_func = each_func->prev_func) |
| 1097 | { |
| 1098 | if (addr >= each_func->low && addr < each_func->high) |
| 1099 | { |
| 1100 | *functionname_ptr = each_func->name; |
| 1101 | return true; |
| 1102 | } |
| 1103 | } |
| 1104 | |
| 1105 | return false; |
| 1106 | } |
| 1107 | |
| 1108 | |
| 1109 | |
| 1110 | |
| 1111 | /* DWARF2 Compilation unit functions. */ |
| 1112 | |
| 1113 | |
| 1114 | /* Scan over each die in a comp. unit looking for functions to add |
| 1115 | to the function table. */ |
| 1116 | |
| 1117 | static boolean |
| 1118 | scan_unit_for_functions (unit) |
| 1119 | struct comp_unit *unit; |
| 1120 | { |
| 1121 | bfd *abfd = unit->abfd; |
| 1122 | char *info_ptr = unit->first_child_die_ptr; |
| 1123 | int nesting_level = 1; |
| 1124 | |
| 1125 | while (nesting_level) |
| 1126 | { |
| 1127 | unsigned int abbrev_number, bytes_read, i; |
| 1128 | struct abbrev_info *abbrev; |
| 1129 | struct attribute attr; |
| 1130 | struct funcinfo *func; |
| 1131 | char* name = 0; |
| 1132 | |
| 1133 | abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| 1134 | info_ptr += bytes_read; |
| 1135 | |
| 1136 | if (! abbrev_number) |
| 1137 | { |
| 1138 | nesting_level--; |
| 1139 | continue; |
| 1140 | } |
| 1141 | |
| 1142 | abbrev = lookup_abbrev (abbrev_number,unit->abbrevs); |
| 1143 | if (! abbrev) |
| 1144 | { |
| 1145 | (*_bfd_error_handler) (_("Dwarf Error: Could not find abbrev number %d."), |
| 1146 | abbrev_number); |
| 1147 | bfd_set_error (bfd_error_bad_value); |
| 1148 | return false; |
| 1149 | } |
| 1150 | |
| 1151 | if (abbrev->tag == DW_TAG_subprogram) |
| 1152 | { |
| 1153 | func = (struct funcinfo*) bfd_zalloc (abfd, sizeof (struct funcinfo)); |
| 1154 | func->prev_func = unit->function_table; |
| 1155 | unit->function_table = func; |
| 1156 | } |
| 1157 | else |
| 1158 | func = NULL; |
| 1159 | |
| 1160 | for (i = 0; i < abbrev->num_attrs; ++i) |
| 1161 | { |
| 1162 | info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr); |
| 1163 | |
| 1164 | if (func) |
| 1165 | { |
| 1166 | switch (attr.name) |
| 1167 | { |
| 1168 | case DW_AT_name: |
| 1169 | |
| 1170 | name = DW_STRING (&attr); |
| 1171 | |
| 1172 | /* Prefer DW_AT_MIPS_linkage_name over DW_AT_name. */ |
| 1173 | if (func->name == NULL) |
| 1174 | func->name = DW_STRING (&attr); |
| 1175 | break; |
| 1176 | |
| 1177 | case DW_AT_MIPS_linkage_name: |
| 1178 | func->name = DW_STRING (&attr); |
| 1179 | break; |
| 1180 | |
| 1181 | case DW_AT_low_pc: |
| 1182 | func->low = DW_ADDR (&attr); |
| 1183 | break; |
| 1184 | |
| 1185 | case DW_AT_high_pc: |
| 1186 | func->high = DW_ADDR (&attr); |
| 1187 | break; |
| 1188 | |
| 1189 | default: |
| 1190 | break; |
| 1191 | } |
| 1192 | } |
| 1193 | else |
| 1194 | { |
| 1195 | switch (attr.name) |
| 1196 | { |
| 1197 | case DW_AT_name: |
| 1198 | name = DW_STRING (&attr); |
| 1199 | break; |
| 1200 | |
| 1201 | default: |
| 1202 | break; |
| 1203 | } |
| 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | if (abbrev->has_children) |
| 1208 | nesting_level++; |
| 1209 | } |
| 1210 | |
| 1211 | return true; |
| 1212 | } |
| 1213 | |
| 1214 | |
| 1215 | |
| 1216 | |
| 1217 | |
| 1218 | |
| 1219 | /* Parse a DWARF2 compilation unit starting at INFO_PTR. This |
| 1220 | includes the compilation unit header that proceeds the DIE's, but |
| 1221 | does not include the length field that preceeds each compilation |
| 1222 | unit header. END_PTR points one past the end of this comp unit. |
| 1223 | If ABBREV_LENGTH is 0, then the length of the abbreviation offset |
| 1224 | is assumed to be four bytes. Otherwise, it it is the size given. |
| 1225 | |
| 1226 | This routine does not read the whole compilation unit; only enough |
| 1227 | to get to the line number information for the compilation unit. */ |
| 1228 | |
| 1229 | static struct comp_unit * |
| 1230 | parse_comp_unit (abfd, info_ptr, end_ptr, abbrev_length) |
| 1231 | bfd* abfd; |
| 1232 | char* info_ptr; |
| 1233 | char* end_ptr; |
| 1234 | unsigned int abbrev_length; |
| 1235 | { |
| 1236 | struct comp_unit* unit; |
| 1237 | |
| 1238 | unsigned short version; |
| 1239 | unsigned int abbrev_offset = 0; |
| 1240 | unsigned char addr_size; |
| 1241 | struct abbrev_info** abbrevs; |
| 1242 | |
| 1243 | unsigned int abbrev_number, bytes_read, i; |
| 1244 | struct abbrev_info *abbrev; |
| 1245 | struct attribute attr; |
| 1246 | |
| 1247 | version = read_2_bytes (abfd, info_ptr); |
| 1248 | info_ptr += 2; |
| 1249 | BFD_ASSERT (abbrev_length == 0 |
| 1250 | || abbrev_length == 4 |
| 1251 | || abbrev_length == 8); |
| 1252 | if (abbrev_length == 0 || abbrev_length == 4) |
| 1253 | abbrev_offset = read_4_bytes (abfd, info_ptr); |
| 1254 | else if (abbrev_length == 8) |
| 1255 | abbrev_offset = read_8_bytes (abfd, info_ptr); |
| 1256 | info_ptr += abbrev_length; |
| 1257 | addr_size = read_1_byte (abfd, info_ptr); |
| 1258 | info_ptr += 1; |
| 1259 | |
| 1260 | if (version != 2) |
| 1261 | { |
| 1262 | (*_bfd_error_handler) (_("Dwarf Error: found dwarf version '%hu', this reader only handles version 2 information."), version ); |
| 1263 | bfd_set_error (bfd_error_bad_value); |
| 1264 | return 0; |
| 1265 | } |
| 1266 | |
| 1267 | if (addr_size > sizeof (bfd_vma)) |
| 1268 | { |
| 1269 | (*_bfd_error_handler) (_("Dwarf Error: found address size '%u', this reader can not handle sizes greater than '%u'."), |
| 1270 | addr_size, |
| 1271 | sizeof (bfd_vma)); |
| 1272 | bfd_set_error (bfd_error_bad_value); |
| 1273 | return 0; |
| 1274 | } |
| 1275 | |
| 1276 | if (addr_size != 4 && addr_size != 8) |
| 1277 | { |
| 1278 | (*_bfd_error_handler) ("Dwarf Error: found address size '%u', this reader can only handle address sizes '4' and '8'.", addr_size ); |
| 1279 | bfd_set_error (bfd_error_bad_value); |
| 1280 | return 0; |
| 1281 | } |
| 1282 | |
| 1283 | /* Read the abbrevs for this compilation unit into a table */ |
| 1284 | abbrevs = read_abbrevs (abfd, abbrev_offset); |
| 1285 | if (! abbrevs) |
| 1286 | return 0; |
| 1287 | |
| 1288 | abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| 1289 | info_ptr += bytes_read; |
| 1290 | if (! abbrev_number) |
| 1291 | { |
| 1292 | (*_bfd_error_handler) (_("Dwarf Error: Bad abbrev number: %d."), |
| 1293 | abbrev_number); |
| 1294 | bfd_set_error (bfd_error_bad_value); |
| 1295 | return 0; |
| 1296 | } |
| 1297 | |
| 1298 | abbrev = lookup_abbrev (abbrev_number, abbrevs); |
| 1299 | if (! abbrev) |
| 1300 | { |
| 1301 | (*_bfd_error_handler) (_("Dwarf Error: Could not find abbrev number %d."), |
| 1302 | abbrev_number); |
| 1303 | bfd_set_error (bfd_error_bad_value); |
| 1304 | return 0; |
| 1305 | } |
| 1306 | |
| 1307 | unit = (struct comp_unit*) bfd_zalloc (abfd, sizeof (struct comp_unit)); |
| 1308 | unit->abfd = abfd; |
| 1309 | unit->addr_size = addr_size; |
| 1310 | unit->abbrevs = abbrevs; |
| 1311 | unit->end_ptr = end_ptr; |
| 1312 | |
| 1313 | for (i = 0; i < abbrev->num_attrs; ++i) |
| 1314 | { |
| 1315 | info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr); |
| 1316 | |
| 1317 | /* Store the data if it is of an attribute we want to keep in a |
| 1318 | partial symbol table. */ |
| 1319 | switch (attr.name) |
| 1320 | { |
| 1321 | case DW_AT_stmt_list: |
| 1322 | unit->stmtlist = 1; |
| 1323 | unit->line_offset = DW_UNSND (&attr); |
| 1324 | break; |
| 1325 | |
| 1326 | case DW_AT_name: |
| 1327 | unit->name = DW_STRING (&attr); |
| 1328 | break; |
| 1329 | |
| 1330 | case DW_AT_low_pc: |
| 1331 | unit->arange.low = DW_ADDR (&attr); |
| 1332 | break; |
| 1333 | |
| 1334 | case DW_AT_high_pc: |
| 1335 | unit->arange.high = DW_ADDR (&attr); |
| 1336 | break; |
| 1337 | |
| 1338 | case DW_AT_comp_dir: |
| 1339 | { |
| 1340 | char* comp_dir = DW_STRING (&attr); |
| 1341 | if (comp_dir) |
| 1342 | { |
| 1343 | /* Irix 6.2 native cc prepends <machine>.: to the compilation |
| 1344 | directory, get rid of it. */ |
| 1345 | char *cp = (char*) strchr (comp_dir, ':'); |
| 1346 | |
| 1347 | if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/') |
| 1348 | comp_dir = cp + 1; |
| 1349 | } |
| 1350 | unit->comp_dir = comp_dir; |
| 1351 | break; |
| 1352 | } |
| 1353 | |
| 1354 | default: |
| 1355 | break; |
| 1356 | } |
| 1357 | } |
| 1358 | |
| 1359 | unit->first_child_die_ptr = info_ptr; |
| 1360 | return unit; |
| 1361 | } |
| 1362 | |
| 1363 | |
| 1364 | |
| 1365 | |
| 1366 | |
| 1367 | /* Return true if UNIT contains the address given by ADDR. */ |
| 1368 | |
| 1369 | static boolean |
| 1370 | comp_unit_contains_address (unit, addr) |
| 1371 | struct comp_unit* unit; |
| 1372 | bfd_vma addr; |
| 1373 | { |
| 1374 | struct arange *arange; |
| 1375 | |
| 1376 | if (unit->error) |
| 1377 | return 0; |
| 1378 | |
| 1379 | arange = &unit->arange; |
| 1380 | do |
| 1381 | { |
| 1382 | if (addr >= arange->low && addr < arange->high) |
| 1383 | return 1; |
| 1384 | arange = arange->next; |
| 1385 | } |
| 1386 | while (arange); |
| 1387 | return 0; |
| 1388 | } |
| 1389 | |
| 1390 | |
| 1391 | /* If UNIT contains ADDR, set the output parameters to the values for |
| 1392 | the line containing ADDR. The output parameters, FILENAME_PTR, |
| 1393 | FUNCTIONNAME_PTR, and LINENUMBER_PTR, are pointers to the objects |
| 1394 | to be filled in. |
| 1395 | |
| 1396 | Return true of UNIT contains ADDR, and no errors were encountered; |
| 1397 | false otherwise. */ |
| 1398 | |
| 1399 | static boolean |
| 1400 | comp_unit_find_nearest_line (unit, addr, |
| 1401 | filename_ptr, functionname_ptr, linenumber_ptr) |
| 1402 | struct comp_unit* unit; |
| 1403 | bfd_vma addr; |
| 1404 | const char **filename_ptr; |
| 1405 | const char **functionname_ptr; |
| 1406 | unsigned int *linenumber_ptr; |
| 1407 | { |
| 1408 | boolean line_p; |
| 1409 | boolean func_p; |
| 1410 | |
| 1411 | if (unit->error) |
| 1412 | return false; |
| 1413 | |
| 1414 | if (! unit->line_table) |
| 1415 | { |
| 1416 | if (! unit->stmtlist) |
| 1417 | { |
| 1418 | unit->error = 1; |
| 1419 | return false; |
| 1420 | } |
| 1421 | |
| 1422 | unit->line_table = decode_line_info (unit); |
| 1423 | |
| 1424 | if (! unit->line_table) |
| 1425 | { |
| 1426 | unit->error = 1; |
| 1427 | return false; |
| 1428 | } |
| 1429 | |
| 1430 | if (! scan_unit_for_functions (unit)) |
| 1431 | { |
| 1432 | unit->error = 1; |
| 1433 | return false; |
| 1434 | } |
| 1435 | } |
| 1436 | |
| 1437 | line_p = lookup_address_in_line_info_table (unit->line_table, |
| 1438 | addr, |
| 1439 | filename_ptr, |
| 1440 | linenumber_ptr); |
| 1441 | func_p = lookup_address_in_function_table (unit->function_table, |
| 1442 | addr, |
| 1443 | functionname_ptr); |
| 1444 | return line_p || func_p; |
| 1445 | } |
| 1446 | |
| 1447 | /* The DWARF2 version of find_nearest line. Return true if the line |
| 1448 | is found without error. ADDR_SIZE is the number of bytes in the |
| 1449 | initial .debug_info length field and in the abbreviation offset. |
| 1450 | You may use zero to indicate that the default value should be |
| 1451 | used. */ |
| 1452 | |
| 1453 | boolean |
| 1454 | _bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, |
| 1455 | filename_ptr, functionname_ptr, |
| 1456 | linenumber_ptr, |
| 1457 | addr_size) |
| 1458 | bfd *abfd; |
| 1459 | asection *section; |
| 1460 | asymbol **symbols ATTRIBUTE_UNUSED; |
| 1461 | bfd_vma offset; |
| 1462 | const char **filename_ptr; |
| 1463 | const char **functionname_ptr; |
| 1464 | unsigned int *linenumber_ptr; |
| 1465 | unsigned int addr_size; |
| 1466 | { |
| 1467 | /* Read each compilation unit from the section .debug_info, and check |
| 1468 | to see if it contains the address we are searching for. If yes, |
| 1469 | lookup the address, and return the line number info. If no, go |
| 1470 | on to the next compilation unit. |
| 1471 | |
| 1472 | We keep a list of all the previously read compilation units, and |
| 1473 | a pointer to the next un-read compilation unit. Check the |
| 1474 | previously read units before reading more. |
| 1475 | */ |
| 1476 | |
| 1477 | struct dwarf2_debug *stash = elf_tdata (abfd)->dwarf2_find_line_info; |
| 1478 | |
| 1479 | /* What address are we looking for? */ |
| 1480 | bfd_vma addr = offset + section->vma; |
| 1481 | |
| 1482 | struct comp_unit* each; |
| 1483 | |
| 1484 | *filename_ptr = NULL; |
| 1485 | *functionname_ptr = NULL; |
| 1486 | *linenumber_ptr = 0; |
| 1487 | |
| 1488 | /* The DWARF2 spec says that the initial length field, and the |
| 1489 | offset of the abbreviation table, should both be 4-byte values. |
| 1490 | However, some compilers do things differently. */ |
| 1491 | if (addr_size == 0) |
| 1492 | addr_size = 4; |
| 1493 | BFD_ASSERT (addr_size == 4 || addr_size == 8); |
| 1494 | |
| 1495 | if (! stash) |
| 1496 | { |
| 1497 | asection *msec; |
| 1498 | unsigned long size; |
| 1499 | |
| 1500 | stash = elf_tdata (abfd)->dwarf2_find_line_info = |
| 1501 | (struct dwarf2_debug*) bfd_zalloc (abfd, sizeof (struct dwarf2_debug)); |
| 1502 | |
| 1503 | if (! stash) |
| 1504 | return false; |
| 1505 | |
| 1506 | msec = bfd_get_section_by_name (abfd, ".debug_info"); |
| 1507 | if (! msec) |
| 1508 | { |
| 1509 | /* No dwarf2 info. Note that at this point the stash |
| 1510 | has been allocated, but contains zeros, this lets |
| 1511 | future calls to this function fail quicker. */ |
| 1512 | return false; |
| 1513 | } |
| 1514 | |
| 1515 | size = bfd_get_section_size_before_reloc (msec); |
| 1516 | if (size == 0) |
| 1517 | return false; |
| 1518 | |
| 1519 | stash->info_ptr = (char *) bfd_alloc (abfd, size); |
| 1520 | |
| 1521 | if (! stash->info_ptr) |
| 1522 | return false; |
| 1523 | |
| 1524 | if (! bfd_get_section_contents (abfd, msec, stash->info_ptr, 0, size)) |
| 1525 | { |
| 1526 | stash->info_ptr = 0; |
| 1527 | return false; |
| 1528 | } |
| 1529 | |
| 1530 | stash->info_ptr_end = stash->info_ptr + size; |
| 1531 | |
| 1532 | /* FIXME: There is a problem with the contents of the |
| 1533 | .debug_info section. The 'low' and 'high' addresses of the |
| 1534 | comp_units are computed by relocs against symbols in the |
| 1535 | .text segment. We need these addresses in order to determine |
| 1536 | the nearest line number, and so we have to resolve the |
| 1537 | relocs. There is a similar problem when the .debug_line |
| 1538 | section is processed as well (e.g., there may be relocs |
| 1539 | against the operand of the DW_LNE_set_address operator). |
| 1540 | |
| 1541 | Unfortunately getting hold of the reloc information is hard... |
| 1542 | |
| 1543 | For now, this means that disassembling object files (as |
| 1544 | opposed to fully executables) does not always work as well as |
| 1545 | we would like. */ |
| 1546 | } |
| 1547 | |
| 1548 | /* A null info_ptr indicates that there is no dwarf2 info |
| 1549 | (or that an error occured while setting up the stash). */ |
| 1550 | |
| 1551 | if (! stash->info_ptr) |
| 1552 | return false; |
| 1553 | |
| 1554 | /* Check the previously read comp. units first. */ |
| 1555 | |
| 1556 | for (each = stash->all_comp_units; each; each = each->next_unit) |
| 1557 | if (comp_unit_contains_address (each, addr)) |
| 1558 | return comp_unit_find_nearest_line (each, addr, filename_ptr, |
| 1559 | functionname_ptr, linenumber_ptr); |
| 1560 | |
| 1561 | /* Read each remaining comp. units checking each as they are read. */ |
| 1562 | while (stash->info_ptr < stash->info_ptr_end) |
| 1563 | { |
| 1564 | struct comp_unit* each; |
| 1565 | bfd_vma length; |
| 1566 | boolean found; |
| 1567 | |
| 1568 | if (addr_size == 4) |
| 1569 | length = read_4_bytes (abfd, stash->info_ptr); |
| 1570 | else |
| 1571 | length = read_8_bytes (abfd, stash->info_ptr); |
| 1572 | stash->info_ptr += addr_size; |
| 1573 | |
| 1574 | if (length > 0) |
| 1575 | { |
| 1576 | each = parse_comp_unit (abfd, stash->info_ptr, |
| 1577 | stash->info_ptr + length, |
| 1578 | addr_size); |
| 1579 | stash->info_ptr += length; |
| 1580 | |
| 1581 | if (each) |
| 1582 | { |
| 1583 | each->next_unit = stash->all_comp_units; |
| 1584 | stash->all_comp_units = each; |
| 1585 | |
| 1586 | /* DW_AT_low_pc and DW_AT_high_pc are optional for |
| 1587 | compilation units. If we don't have them (i.e., |
| 1588 | unit->high == 0), we need to consult the line info |
| 1589 | table to see if a compilation unit contains the given |
| 1590 | address. */ |
| 1591 | if (each->arange.high > 0) |
| 1592 | { |
| 1593 | if (comp_unit_contains_address (each, addr)) |
| 1594 | return comp_unit_find_nearest_line (each, addr, |
| 1595 | filename_ptr, |
| 1596 | functionname_ptr, |
| 1597 | linenumber_ptr); |
| 1598 | } |
| 1599 | else |
| 1600 | { |
| 1601 | found = comp_unit_find_nearest_line (each, addr, |
| 1602 | filename_ptr, |
| 1603 | functionname_ptr, |
| 1604 | linenumber_ptr); |
| 1605 | if (found) |
| 1606 | return true; |
| 1607 | } |
| 1608 | } |
| 1609 | } |
| 1610 | } |
| 1611 | |
| 1612 | return false; |
| 1613 | } |
| 1614 | |
| 1615 | /* end of file */ |