| 1 | /* Read DWARF macro information |
| 2 | |
| 3 | Copyright (C) 1994-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, |
| 6 | Inc. with support from Florida State University (under contract |
| 7 | with the Ada Joint Program Office), and Silicon Graphics, Inc. |
| 8 | Initial contribution by Brent Benson, Harris Computer Systems, Inc., |
| 9 | based on Fred Fish's (Cygnus Support) implementation of DWARF 1 |
| 10 | support. |
| 11 | |
| 12 | This file is part of GDB. |
| 13 | |
| 14 | This program is free software; you can redistribute it and/or modify |
| 15 | it under the terms of the GNU General Public License as published by |
| 16 | the Free Software Foundation; either version 3 of the License, or |
| 17 | (at your option) any later version. |
| 18 | |
| 19 | This program is distributed in the hope that it will be useful, |
| 20 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | GNU General Public License for more details. |
| 23 | |
| 24 | You should have received a copy of the GNU General Public License |
| 25 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 26 | |
| 27 | #include "defs.h" |
| 28 | #include "dwarf2/read.h" |
| 29 | #include "dwarf2/leb.h" |
| 30 | #include "dwarf2/expr.h" |
| 31 | #include "dwarf2/line-header.h" |
| 32 | #include "dwarf2/section.h" |
| 33 | #include "dwarf2/macro.h" |
| 34 | #include "dwarf2/dwz.h" |
| 35 | #include "buildsym.h" |
| 36 | #include "macrotab.h" |
| 37 | #include "complaints.h" |
| 38 | |
| 39 | static void |
| 40 | dwarf2_macro_malformed_definition_complaint (const char *arg1) |
| 41 | { |
| 42 | complaint (_("macro debug info contains a " |
| 43 | "malformed macro definition:\n`%s'"), |
| 44 | arg1); |
| 45 | } |
| 46 | |
| 47 | static struct macro_source_file * |
| 48 | macro_start_file (buildsym_compunit *builder, |
| 49 | int file, int line, |
| 50 | struct macro_source_file *current_file, |
| 51 | const struct line_header *lh) |
| 52 | { |
| 53 | /* File name relative to the compilation directory of this source file. */ |
| 54 | gdb::unique_xmalloc_ptr<char> file_name = lh->file_file_name (file); |
| 55 | |
| 56 | if (! current_file) |
| 57 | { |
| 58 | /* Note: We don't create a macro table for this compilation unit |
| 59 | at all until we actually get a filename. */ |
| 60 | struct macro_table *macro_table = builder->get_macro_table (); |
| 61 | |
| 62 | /* If we have no current file, then this must be the start_file |
| 63 | directive for the compilation unit's main source file. */ |
| 64 | current_file = macro_set_main (macro_table, file_name.get ()); |
| 65 | macro_define_special (macro_table); |
| 66 | } |
| 67 | else |
| 68 | current_file = macro_include (current_file, line, file_name.get ()); |
| 69 | |
| 70 | return current_file; |
| 71 | } |
| 72 | |
| 73 | static const char * |
| 74 | consume_improper_spaces (const char *p, const char *body) |
| 75 | { |
| 76 | if (*p == ' ') |
| 77 | { |
| 78 | complaint (_("macro definition contains spaces " |
| 79 | "in formal argument list:\n`%s'"), |
| 80 | body); |
| 81 | |
| 82 | while (*p == ' ') |
| 83 | p++; |
| 84 | } |
| 85 | |
| 86 | return p; |
| 87 | } |
| 88 | |
| 89 | |
| 90 | static void |
| 91 | parse_macro_definition (struct macro_source_file *file, int line, |
| 92 | const char *body) |
| 93 | { |
| 94 | const char *p; |
| 95 | |
| 96 | /* The body string takes one of two forms. For object-like macro |
| 97 | definitions, it should be: |
| 98 | |
| 99 | <macro name> " " <definition> |
| 100 | |
| 101 | For function-like macro definitions, it should be: |
| 102 | |
| 103 | <macro name> "() " <definition> |
| 104 | or |
| 105 | <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition> |
| 106 | |
| 107 | Spaces may appear only where explicitly indicated, and in the |
| 108 | <definition>. |
| 109 | |
| 110 | The Dwarf 2 spec says that an object-like macro's name is always |
| 111 | followed by a space, but versions of GCC around March 2002 omit |
| 112 | the space when the macro's definition is the empty string. |
| 113 | |
| 114 | The Dwarf 2 spec says that there should be no spaces between the |
| 115 | formal arguments in a function-like macro's formal argument list, |
| 116 | but versions of GCC around March 2002 include spaces after the |
| 117 | commas. */ |
| 118 | |
| 119 | |
| 120 | /* Find the extent of the macro name. The macro name is terminated |
| 121 | by either a space or null character (for an object-like macro) or |
| 122 | an opening paren (for a function-like macro). */ |
| 123 | for (p = body; *p; p++) |
| 124 | if (*p == ' ' || *p == '(') |
| 125 | break; |
| 126 | |
| 127 | if (*p == ' ' || *p == '\0') |
| 128 | { |
| 129 | /* It's an object-like macro. */ |
| 130 | int name_len = p - body; |
| 131 | std::string name (body, name_len); |
| 132 | const char *replacement; |
| 133 | |
| 134 | if (*p == ' ') |
| 135 | replacement = body + name_len + 1; |
| 136 | else |
| 137 | { |
| 138 | dwarf2_macro_malformed_definition_complaint (body); |
| 139 | replacement = body + name_len; |
| 140 | } |
| 141 | |
| 142 | macro_define_object (file, line, name.c_str (), replacement); |
| 143 | } |
| 144 | else if (*p == '(') |
| 145 | { |
| 146 | /* It's a function-like macro. */ |
| 147 | std::string name (body, p - body); |
| 148 | int argc = 0; |
| 149 | int argv_size = 1; |
| 150 | char **argv = XNEWVEC (char *, argv_size); |
| 151 | |
| 152 | p++; |
| 153 | |
| 154 | p = consume_improper_spaces (p, body); |
| 155 | |
| 156 | /* Parse the formal argument list. */ |
| 157 | while (*p && *p != ')') |
| 158 | { |
| 159 | /* Find the extent of the current argument name. */ |
| 160 | const char *arg_start = p; |
| 161 | |
| 162 | while (*p && *p != ',' && *p != ')' && *p != ' ') |
| 163 | p++; |
| 164 | |
| 165 | if (! *p || p == arg_start) |
| 166 | dwarf2_macro_malformed_definition_complaint (body); |
| 167 | else |
| 168 | { |
| 169 | /* Make sure argv has room for the new argument. */ |
| 170 | if (argc >= argv_size) |
| 171 | { |
| 172 | argv_size *= 2; |
| 173 | argv = XRESIZEVEC (char *, argv, argv_size); |
| 174 | } |
| 175 | |
| 176 | argv[argc++] = savestring (arg_start, p - arg_start); |
| 177 | } |
| 178 | |
| 179 | p = consume_improper_spaces (p, body); |
| 180 | |
| 181 | /* Consume the comma, if present. */ |
| 182 | if (*p == ',') |
| 183 | { |
| 184 | p++; |
| 185 | |
| 186 | p = consume_improper_spaces (p, body); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | if (*p == ')') |
| 191 | { |
| 192 | p++; |
| 193 | |
| 194 | if (*p == ' ') |
| 195 | /* Perfectly formed definition, no complaints. */ |
| 196 | macro_define_function (file, line, name.c_str (), |
| 197 | argc, (const char **) argv, |
| 198 | p + 1); |
| 199 | else if (*p == '\0') |
| 200 | { |
| 201 | /* Complain, but do define it. */ |
| 202 | dwarf2_macro_malformed_definition_complaint (body); |
| 203 | macro_define_function (file, line, name.c_str (), |
| 204 | argc, (const char **) argv, |
| 205 | p); |
| 206 | } |
| 207 | else |
| 208 | /* Just complain. */ |
| 209 | dwarf2_macro_malformed_definition_complaint (body); |
| 210 | } |
| 211 | else |
| 212 | /* Just complain. */ |
| 213 | dwarf2_macro_malformed_definition_complaint (body); |
| 214 | |
| 215 | { |
| 216 | int i; |
| 217 | |
| 218 | for (i = 0; i < argc; i++) |
| 219 | xfree (argv[i]); |
| 220 | } |
| 221 | xfree (argv); |
| 222 | } |
| 223 | else |
| 224 | dwarf2_macro_malformed_definition_complaint (body); |
| 225 | } |
| 226 | |
| 227 | /* Skip some bytes from BYTES according to the form given in FORM. |
| 228 | Returns the new pointer. */ |
| 229 | |
| 230 | static const gdb_byte * |
| 231 | skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end, |
| 232 | enum dwarf_form form, |
| 233 | unsigned int offset_size, |
| 234 | const struct dwarf2_section_info *section) |
| 235 | { |
| 236 | unsigned int bytes_read; |
| 237 | |
| 238 | switch (form) |
| 239 | { |
| 240 | case DW_FORM_data1: |
| 241 | case DW_FORM_flag: |
| 242 | ++bytes; |
| 243 | break; |
| 244 | |
| 245 | case DW_FORM_data2: |
| 246 | bytes += 2; |
| 247 | break; |
| 248 | |
| 249 | case DW_FORM_data4: |
| 250 | bytes += 4; |
| 251 | break; |
| 252 | |
| 253 | case DW_FORM_data8: |
| 254 | bytes += 8; |
| 255 | break; |
| 256 | |
| 257 | case DW_FORM_data16: |
| 258 | bytes += 16; |
| 259 | break; |
| 260 | |
| 261 | case DW_FORM_string: |
| 262 | read_direct_string (abfd, bytes, &bytes_read); |
| 263 | bytes += bytes_read; |
| 264 | break; |
| 265 | |
| 266 | case DW_FORM_sec_offset: |
| 267 | case DW_FORM_strp: |
| 268 | case DW_FORM_GNU_strp_alt: |
| 269 | bytes += offset_size; |
| 270 | break; |
| 271 | |
| 272 | case DW_FORM_block: |
| 273 | bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read); |
| 274 | bytes += bytes_read; |
| 275 | break; |
| 276 | |
| 277 | case DW_FORM_block1: |
| 278 | bytes += 1 + read_1_byte (abfd, bytes); |
| 279 | break; |
| 280 | case DW_FORM_block2: |
| 281 | bytes += 2 + read_2_bytes (abfd, bytes); |
| 282 | break; |
| 283 | case DW_FORM_block4: |
| 284 | bytes += 4 + read_4_bytes (abfd, bytes); |
| 285 | break; |
| 286 | |
| 287 | case DW_FORM_addrx: |
| 288 | case DW_FORM_sdata: |
| 289 | case DW_FORM_strx: |
| 290 | case DW_FORM_udata: |
| 291 | case DW_FORM_GNU_addr_index: |
| 292 | case DW_FORM_GNU_str_index: |
| 293 | bytes = gdb_skip_leb128 (bytes, buffer_end); |
| 294 | if (bytes == NULL) |
| 295 | { |
| 296 | section->overflow_complaint (); |
| 297 | return NULL; |
| 298 | } |
| 299 | break; |
| 300 | |
| 301 | case DW_FORM_implicit_const: |
| 302 | break; |
| 303 | |
| 304 | default: |
| 305 | { |
| 306 | complaint (_("invalid form 0x%x in `%s'"), |
| 307 | form, section->get_name ()); |
| 308 | return NULL; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | return bytes; |
| 313 | } |
| 314 | |
| 315 | /* A helper for dwarf_decode_macros that handles skipping an unknown |
| 316 | opcode. Returns an updated pointer to the macro data buffer; or, |
| 317 | on error, issues a complaint and returns NULL. */ |
| 318 | |
| 319 | static const gdb_byte * |
| 320 | skip_unknown_opcode (unsigned int opcode, |
| 321 | const gdb_byte **opcode_definitions, |
| 322 | const gdb_byte *mac_ptr, const gdb_byte *mac_end, |
| 323 | bfd *abfd, |
| 324 | unsigned int offset_size, |
| 325 | const struct dwarf2_section_info *section) |
| 326 | { |
| 327 | unsigned int bytes_read, i; |
| 328 | unsigned long arg; |
| 329 | const gdb_byte *defn; |
| 330 | |
| 331 | if (opcode_definitions[opcode] == NULL) |
| 332 | { |
| 333 | complaint (_("unrecognized DW_MACFINO opcode 0x%x"), |
| 334 | opcode); |
| 335 | return NULL; |
| 336 | } |
| 337 | |
| 338 | defn = opcode_definitions[opcode]; |
| 339 | arg = read_unsigned_leb128 (abfd, defn, &bytes_read); |
| 340 | defn += bytes_read; |
| 341 | |
| 342 | for (i = 0; i < arg; ++i) |
| 343 | { |
| 344 | mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, |
| 345 | (enum dwarf_form) defn[i], offset_size, |
| 346 | section); |
| 347 | if (mac_ptr == NULL) |
| 348 | { |
| 349 | /* skip_form_bytes already issued the complaint. */ |
| 350 | return NULL; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | return mac_ptr; |
| 355 | } |
| 356 | |
| 357 | /* A helper function which parses the header of a macro section. |
| 358 | If the macro section is the extended (for now called "GNU") type, |
| 359 | then this updates *OFFSET_SIZE. Returns a pointer to just after |
| 360 | the header, or issues a complaint and returns NULL on error. */ |
| 361 | |
| 362 | static const gdb_byte * |
| 363 | dwarf_parse_macro_header (const gdb_byte **opcode_definitions, |
| 364 | bfd *abfd, |
| 365 | const gdb_byte *mac_ptr, |
| 366 | unsigned int *offset_size, |
| 367 | int section_is_gnu) |
| 368 | { |
| 369 | memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *)); |
| 370 | |
| 371 | if (section_is_gnu) |
| 372 | { |
| 373 | unsigned int version, flags; |
| 374 | |
| 375 | version = read_2_bytes (abfd, mac_ptr); |
| 376 | if (version != 4 && version != 5) |
| 377 | { |
| 378 | complaint (_("unrecognized version `%d' in .debug_macro section"), |
| 379 | version); |
| 380 | return NULL; |
| 381 | } |
| 382 | mac_ptr += 2; |
| 383 | |
| 384 | flags = read_1_byte (abfd, mac_ptr); |
| 385 | ++mac_ptr; |
| 386 | *offset_size = (flags & 1) ? 8 : 4; |
| 387 | |
| 388 | if ((flags & 2) != 0) |
| 389 | /* We don't need the line table offset. */ |
| 390 | mac_ptr += *offset_size; |
| 391 | |
| 392 | /* Vendor opcode descriptions. */ |
| 393 | if ((flags & 4) != 0) |
| 394 | { |
| 395 | unsigned int i, count; |
| 396 | |
| 397 | count = read_1_byte (abfd, mac_ptr); |
| 398 | ++mac_ptr; |
| 399 | for (i = 0; i < count; ++i) |
| 400 | { |
| 401 | unsigned int opcode, bytes_read; |
| 402 | unsigned long arg; |
| 403 | |
| 404 | opcode = read_1_byte (abfd, mac_ptr); |
| 405 | ++mac_ptr; |
| 406 | opcode_definitions[opcode] = mac_ptr; |
| 407 | arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 408 | mac_ptr += bytes_read; |
| 409 | mac_ptr += arg; |
| 410 | } |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | return mac_ptr; |
| 415 | } |
| 416 | |
| 417 | /* A helper for dwarf_decode_macros that handles the GNU extensions, |
| 418 | including DW_MACRO_import. */ |
| 419 | |
| 420 | static void |
| 421 | dwarf_decode_macro_bytes (struct dwarf2_per_objfile *dwarf2_per_objfile, |
| 422 | buildsym_compunit *builder, |
| 423 | bfd *abfd, |
| 424 | const gdb_byte *mac_ptr, const gdb_byte *mac_end, |
| 425 | struct macro_source_file *current_file, |
| 426 | const struct line_header *lh, |
| 427 | const struct dwarf2_section_info *section, |
| 428 | int section_is_gnu, int section_is_dwz, |
| 429 | unsigned int offset_size, |
| 430 | htab_t include_hash) |
| 431 | { |
| 432 | struct objfile *objfile = dwarf2_per_objfile->objfile; |
| 433 | enum dwarf_macro_record_type macinfo_type; |
| 434 | int at_commandline; |
| 435 | const gdb_byte *opcode_definitions[256]; |
| 436 | |
| 437 | mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr, |
| 438 | &offset_size, section_is_gnu); |
| 439 | if (mac_ptr == NULL) |
| 440 | { |
| 441 | /* We already issued a complaint. */ |
| 442 | return; |
| 443 | } |
| 444 | |
| 445 | /* Determines if GDB is still before first DW_MACINFO_start_file. If true |
| 446 | GDB is still reading the definitions from command line. First |
| 447 | DW_MACINFO_start_file will need to be ignored as it was already executed |
| 448 | to create CURRENT_FILE for the main source holding also the command line |
| 449 | definitions. On first met DW_MACINFO_start_file this flag is reset to |
| 450 | normally execute all the remaining DW_MACINFO_start_file macinfos. */ |
| 451 | |
| 452 | at_commandline = 1; |
| 453 | |
| 454 | do |
| 455 | { |
| 456 | /* Do we at least have room for a macinfo type byte? */ |
| 457 | if (mac_ptr >= mac_end) |
| 458 | { |
| 459 | section->overflow_complaint (); |
| 460 | break; |
| 461 | } |
| 462 | |
| 463 | macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr); |
| 464 | mac_ptr++; |
| 465 | |
| 466 | /* Note that we rely on the fact that the corresponding GNU and |
| 467 | DWARF constants are the same. */ |
| 468 | DIAGNOSTIC_PUSH |
| 469 | DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES |
| 470 | switch (macinfo_type) |
| 471 | { |
| 472 | /* A zero macinfo type indicates the end of the macro |
| 473 | information. */ |
| 474 | case 0: |
| 475 | break; |
| 476 | |
| 477 | case DW_MACRO_define: |
| 478 | case DW_MACRO_undef: |
| 479 | case DW_MACRO_define_strp: |
| 480 | case DW_MACRO_undef_strp: |
| 481 | case DW_MACRO_define_sup: |
| 482 | case DW_MACRO_undef_sup: |
| 483 | { |
| 484 | unsigned int bytes_read; |
| 485 | int line; |
| 486 | const char *body; |
| 487 | int is_define; |
| 488 | |
| 489 | line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 490 | mac_ptr += bytes_read; |
| 491 | |
| 492 | if (macinfo_type == DW_MACRO_define |
| 493 | || macinfo_type == DW_MACRO_undef) |
| 494 | { |
| 495 | body = read_direct_string (abfd, mac_ptr, &bytes_read); |
| 496 | mac_ptr += bytes_read; |
| 497 | } |
| 498 | else |
| 499 | { |
| 500 | LONGEST str_offset; |
| 501 | |
| 502 | str_offset = read_offset (abfd, mac_ptr, offset_size); |
| 503 | mac_ptr += offset_size; |
| 504 | |
| 505 | if (macinfo_type == DW_MACRO_define_sup |
| 506 | || macinfo_type == DW_MACRO_undef_sup |
| 507 | || section_is_dwz) |
| 508 | { |
| 509 | struct dwz_file *dwz |
| 510 | = dwarf2_get_dwz_file (dwarf2_per_objfile->per_bfd); |
| 511 | |
| 512 | body = dwz->read_string (objfile, str_offset); |
| 513 | } |
| 514 | else |
| 515 | body = dwarf2_per_objfile->per_bfd->str.read_string (objfile, |
| 516 | str_offset, |
| 517 | "DW_FORM_strp"); |
| 518 | } |
| 519 | |
| 520 | is_define = (macinfo_type == DW_MACRO_define |
| 521 | || macinfo_type == DW_MACRO_define_strp |
| 522 | || macinfo_type == DW_MACRO_define_sup); |
| 523 | if (! current_file) |
| 524 | { |
| 525 | /* DWARF violation as no main source is present. */ |
| 526 | complaint (_("debug info with no main source gives macro %s " |
| 527 | "on line %d: %s"), |
| 528 | is_define ? _("definition") : _("undefinition"), |
| 529 | line, body); |
| 530 | break; |
| 531 | } |
| 532 | if ((line == 0 && !at_commandline) |
| 533 | || (line != 0 && at_commandline)) |
| 534 | complaint (_("debug info gives %s macro %s with %s line %d: %s"), |
| 535 | at_commandline ? _("command-line") : _("in-file"), |
| 536 | is_define ? _("definition") : _("undefinition"), |
| 537 | line == 0 ? _("zero") : _("non-zero"), line, body); |
| 538 | |
| 539 | if (body == NULL) |
| 540 | { |
| 541 | /* Fedora's rpm-build's "debugedit" binary |
| 542 | corrupted .debug_macro sections. |
| 543 | |
| 544 | For more info, see |
| 545 | https://bugzilla.redhat.com/show_bug.cgi?id=1708786 */ |
| 546 | complaint (_("debug info gives %s invalid macro %s " |
| 547 | "without body (corrupted?) at line %d " |
| 548 | "on file %s"), |
| 549 | at_commandline ? _("command-line") : _("in-file"), |
| 550 | is_define ? _("definition") : _("undefinition"), |
| 551 | line, current_file->filename); |
| 552 | } |
| 553 | else if (is_define) |
| 554 | parse_macro_definition (current_file, line, body); |
| 555 | else |
| 556 | { |
| 557 | gdb_assert (macinfo_type == DW_MACRO_undef |
| 558 | || macinfo_type == DW_MACRO_undef_strp |
| 559 | || macinfo_type == DW_MACRO_undef_sup); |
| 560 | macro_undef (current_file, line, body); |
| 561 | } |
| 562 | } |
| 563 | break; |
| 564 | |
| 565 | case DW_MACRO_start_file: |
| 566 | { |
| 567 | unsigned int bytes_read; |
| 568 | int line, file; |
| 569 | |
| 570 | line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 571 | mac_ptr += bytes_read; |
| 572 | file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 573 | mac_ptr += bytes_read; |
| 574 | |
| 575 | if ((line == 0 && !at_commandline) |
| 576 | || (line != 0 && at_commandline)) |
| 577 | complaint (_("debug info gives source %d included " |
| 578 | "from %s at %s line %d"), |
| 579 | file, at_commandline ? _("command-line") : _("file"), |
| 580 | line == 0 ? _("zero") : _("non-zero"), line); |
| 581 | |
| 582 | if (at_commandline) |
| 583 | { |
| 584 | /* This DW_MACRO_start_file was executed in the |
| 585 | pass one. */ |
| 586 | at_commandline = 0; |
| 587 | } |
| 588 | else |
| 589 | current_file = macro_start_file (builder, file, line, |
| 590 | current_file, lh); |
| 591 | } |
| 592 | break; |
| 593 | |
| 594 | case DW_MACRO_end_file: |
| 595 | if (! current_file) |
| 596 | complaint (_("macro debug info has an unmatched " |
| 597 | "`close_file' directive")); |
| 598 | else |
| 599 | { |
| 600 | current_file = current_file->included_by; |
| 601 | if (! current_file) |
| 602 | { |
| 603 | enum dwarf_macro_record_type next_type; |
| 604 | |
| 605 | /* GCC circa March 2002 doesn't produce the zero |
| 606 | type byte marking the end of the compilation |
| 607 | unit. Complain if it's not there, but exit no |
| 608 | matter what. */ |
| 609 | |
| 610 | /* Do we at least have room for a macinfo type byte? */ |
| 611 | if (mac_ptr >= mac_end) |
| 612 | { |
| 613 | section->overflow_complaint (); |
| 614 | return; |
| 615 | } |
| 616 | |
| 617 | /* We don't increment mac_ptr here, so this is just |
| 618 | a look-ahead. */ |
| 619 | next_type |
| 620 | = (enum dwarf_macro_record_type) read_1_byte (abfd, |
| 621 | mac_ptr); |
| 622 | if (next_type != 0) |
| 623 | complaint (_("no terminating 0-type entry for " |
| 624 | "macros in `.debug_macinfo' section")); |
| 625 | |
| 626 | return; |
| 627 | } |
| 628 | } |
| 629 | break; |
| 630 | |
| 631 | case DW_MACRO_import: |
| 632 | case DW_MACRO_import_sup: |
| 633 | { |
| 634 | LONGEST offset; |
| 635 | void **slot; |
| 636 | bfd *include_bfd = abfd; |
| 637 | const struct dwarf2_section_info *include_section = section; |
| 638 | const gdb_byte *include_mac_end = mac_end; |
| 639 | int is_dwz = section_is_dwz; |
| 640 | const gdb_byte *new_mac_ptr; |
| 641 | |
| 642 | offset = read_offset (abfd, mac_ptr, offset_size); |
| 643 | mac_ptr += offset_size; |
| 644 | |
| 645 | if (macinfo_type == DW_MACRO_import_sup) |
| 646 | { |
| 647 | struct dwz_file *dwz |
| 648 | = dwarf2_get_dwz_file (dwarf2_per_objfile->per_bfd); |
| 649 | |
| 650 | dwz->macro.read (objfile); |
| 651 | |
| 652 | include_section = &dwz->macro; |
| 653 | include_bfd = include_section->get_bfd_owner (); |
| 654 | include_mac_end = dwz->macro.buffer + dwz->macro.size; |
| 655 | is_dwz = 1; |
| 656 | } |
| 657 | |
| 658 | new_mac_ptr = include_section->buffer + offset; |
| 659 | slot = htab_find_slot (include_hash, new_mac_ptr, INSERT); |
| 660 | |
| 661 | if (*slot != NULL) |
| 662 | { |
| 663 | /* This has actually happened; see |
| 664 | http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */ |
| 665 | complaint (_("recursive DW_MACRO_import in " |
| 666 | ".debug_macro section")); |
| 667 | } |
| 668 | else |
| 669 | { |
| 670 | *slot = (void *) new_mac_ptr; |
| 671 | |
| 672 | dwarf_decode_macro_bytes (dwarf2_per_objfile, builder, |
| 673 | include_bfd, new_mac_ptr, |
| 674 | include_mac_end, current_file, lh, |
| 675 | section, section_is_gnu, is_dwz, |
| 676 | offset_size, include_hash); |
| 677 | |
| 678 | htab_remove_elt (include_hash, (void *) new_mac_ptr); |
| 679 | } |
| 680 | } |
| 681 | break; |
| 682 | |
| 683 | case DW_MACINFO_vendor_ext: |
| 684 | if (!section_is_gnu) |
| 685 | { |
| 686 | unsigned int bytes_read; |
| 687 | |
| 688 | /* This reads the constant, but since we don't recognize |
| 689 | any vendor extensions, we ignore it. */ |
| 690 | read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 691 | mac_ptr += bytes_read; |
| 692 | read_direct_string (abfd, mac_ptr, &bytes_read); |
| 693 | mac_ptr += bytes_read; |
| 694 | |
| 695 | /* We don't recognize any vendor extensions. */ |
| 696 | break; |
| 697 | } |
| 698 | /* FALLTHROUGH */ |
| 699 | |
| 700 | default: |
| 701 | mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions, |
| 702 | mac_ptr, mac_end, abfd, offset_size, |
| 703 | section); |
| 704 | if (mac_ptr == NULL) |
| 705 | return; |
| 706 | break; |
| 707 | } |
| 708 | DIAGNOSTIC_POP |
| 709 | } while (macinfo_type != 0); |
| 710 | } |
| 711 | |
| 712 | void |
| 713 | dwarf_decode_macros (struct dwarf2_per_objfile *dwarf2_per_objfile, |
| 714 | buildsym_compunit *builder, |
| 715 | const dwarf2_section_info *section, |
| 716 | const struct line_header *lh, unsigned int offset_size, |
| 717 | unsigned int offset, int section_is_gnu) |
| 718 | { |
| 719 | bfd *abfd; |
| 720 | const gdb_byte *mac_ptr, *mac_end; |
| 721 | struct macro_source_file *current_file = 0; |
| 722 | enum dwarf_macro_record_type macinfo_type; |
| 723 | const gdb_byte *opcode_definitions[256]; |
| 724 | void **slot; |
| 725 | |
| 726 | abfd = section->get_bfd_owner (); |
| 727 | |
| 728 | /* First pass: Find the name of the base filename. |
| 729 | This filename is needed in order to process all macros whose definition |
| 730 | (or undefinition) comes from the command line. These macros are defined |
| 731 | before the first DW_MACINFO_start_file entry, and yet still need to be |
| 732 | associated to the base file. |
| 733 | |
| 734 | To determine the base file name, we scan the macro definitions until we |
| 735 | reach the first DW_MACINFO_start_file entry. We then initialize |
| 736 | CURRENT_FILE accordingly so that any macro definition found before the |
| 737 | first DW_MACINFO_start_file can still be associated to the base file. */ |
| 738 | |
| 739 | mac_ptr = section->buffer + offset; |
| 740 | mac_end = section->buffer + section->size; |
| 741 | |
| 742 | mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr, |
| 743 | &offset_size, section_is_gnu); |
| 744 | if (mac_ptr == NULL) |
| 745 | { |
| 746 | /* We already issued a complaint. */ |
| 747 | return; |
| 748 | } |
| 749 | |
| 750 | do |
| 751 | { |
| 752 | /* Do we at least have room for a macinfo type byte? */ |
| 753 | if (mac_ptr >= mac_end) |
| 754 | { |
| 755 | /* Complaint is printed during the second pass as GDB will probably |
| 756 | stop the first pass earlier upon finding |
| 757 | DW_MACINFO_start_file. */ |
| 758 | break; |
| 759 | } |
| 760 | |
| 761 | macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr); |
| 762 | mac_ptr++; |
| 763 | |
| 764 | /* Note that we rely on the fact that the corresponding GNU and |
| 765 | DWARF constants are the same. */ |
| 766 | DIAGNOSTIC_PUSH |
| 767 | DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES |
| 768 | switch (macinfo_type) |
| 769 | { |
| 770 | /* A zero macinfo type indicates the end of the macro |
| 771 | information. */ |
| 772 | case 0: |
| 773 | break; |
| 774 | |
| 775 | case DW_MACRO_define: |
| 776 | case DW_MACRO_undef: |
| 777 | /* Only skip the data by MAC_PTR. */ |
| 778 | { |
| 779 | unsigned int bytes_read; |
| 780 | |
| 781 | read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 782 | mac_ptr += bytes_read; |
| 783 | read_direct_string (abfd, mac_ptr, &bytes_read); |
| 784 | mac_ptr += bytes_read; |
| 785 | } |
| 786 | break; |
| 787 | |
| 788 | case DW_MACRO_start_file: |
| 789 | { |
| 790 | unsigned int bytes_read; |
| 791 | int line, file; |
| 792 | |
| 793 | line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 794 | mac_ptr += bytes_read; |
| 795 | file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 796 | mac_ptr += bytes_read; |
| 797 | |
| 798 | current_file = macro_start_file (builder, file, line, |
| 799 | current_file, lh); |
| 800 | } |
| 801 | break; |
| 802 | |
| 803 | case DW_MACRO_end_file: |
| 804 | /* No data to skip by MAC_PTR. */ |
| 805 | break; |
| 806 | |
| 807 | case DW_MACRO_define_strp: |
| 808 | case DW_MACRO_undef_strp: |
| 809 | case DW_MACRO_define_sup: |
| 810 | case DW_MACRO_undef_sup: |
| 811 | { |
| 812 | unsigned int bytes_read; |
| 813 | |
| 814 | read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 815 | mac_ptr += bytes_read; |
| 816 | mac_ptr += offset_size; |
| 817 | } |
| 818 | break; |
| 819 | |
| 820 | case DW_MACRO_import: |
| 821 | case DW_MACRO_import_sup: |
| 822 | /* Note that, according to the spec, a transparent include |
| 823 | chain cannot call DW_MACRO_start_file. So, we can just |
| 824 | skip this opcode. */ |
| 825 | mac_ptr += offset_size; |
| 826 | break; |
| 827 | |
| 828 | case DW_MACINFO_vendor_ext: |
| 829 | /* Only skip the data by MAC_PTR. */ |
| 830 | if (!section_is_gnu) |
| 831 | { |
| 832 | unsigned int bytes_read; |
| 833 | |
| 834 | read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| 835 | mac_ptr += bytes_read; |
| 836 | read_direct_string (abfd, mac_ptr, &bytes_read); |
| 837 | mac_ptr += bytes_read; |
| 838 | } |
| 839 | /* FALLTHROUGH */ |
| 840 | |
| 841 | default: |
| 842 | mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions, |
| 843 | mac_ptr, mac_end, abfd, offset_size, |
| 844 | section); |
| 845 | if (mac_ptr == NULL) |
| 846 | return; |
| 847 | break; |
| 848 | } |
| 849 | DIAGNOSTIC_POP |
| 850 | } while (macinfo_type != 0 && current_file == NULL); |
| 851 | |
| 852 | /* Second pass: Process all entries. |
| 853 | |
| 854 | Use the AT_COMMAND_LINE flag to determine whether we are still processing |
| 855 | command-line macro definitions/undefinitions. This flag is unset when we |
| 856 | reach the first DW_MACINFO_start_file entry. */ |
| 857 | |
| 858 | htab_up include_hash (htab_create_alloc (1, htab_hash_pointer, |
| 859 | htab_eq_pointer, |
| 860 | NULL, xcalloc, xfree)); |
| 861 | mac_ptr = section->buffer + offset; |
| 862 | slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT); |
| 863 | *slot = (void *) mac_ptr; |
| 864 | dwarf_decode_macro_bytes (dwarf2_per_objfile, builder, |
| 865 | abfd, mac_ptr, mac_end, |
| 866 | current_file, lh, section, |
| 867 | section_is_gnu, 0, offset_size, |
| 868 | include_hash.get ()); |
| 869 | } |