Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Get macro information. |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 2 | Copyright (C) 2002-2009, 2014 Red Hat, Inc. |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 3 | This file is part of elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 2002. |
| 5 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 8 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 9 | * the GNU Lesser General Public License as published by the Free |
| 10 | Software Foundation; either version 3 of the License, or (at |
| 11 | your option) any later version |
| 12 | |
| 13 | or |
| 14 | |
| 15 | * the GNU General Public License as published by the Free |
| 16 | Software Foundation; either version 2 of the License, or (at |
| 17 | your option) any later version |
| 18 | |
| 19 | or both in parallel, as here. |
| 20 | |
| 21 | elfutils is distributed in the hope that it will be useful, but |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 22 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 24 | General Public License for more details. |
| 25 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 26 | You should have received copies of the GNU General Public License and |
| 27 | the GNU Lesser General Public License along with this program. If |
| 28 | not, see <http://www.gnu.org/licenses/>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | # include <config.h> |
| 32 | #endif |
| 33 | |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 34 | #include <assert.h> |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 35 | #include <dwarf.h> |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 36 | #include <search.h> |
| 37 | #include <stdlib.h> |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 38 | #include <string.h> |
| 39 | |
| 40 | #include <libdwP.h> |
| 41 | |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 42 | static int |
| 43 | get_offset_from (Dwarf_Die *die, int name, Dwarf_Word *retp) |
| 44 | { |
| 45 | /* Get the appropriate attribute. */ |
| 46 | Dwarf_Attribute attr; |
| 47 | if (INTUSE(dwarf_attr) (die, name, &attr) == NULL) |
| 48 | return -1; |
| 49 | |
| 50 | /* Offset into the corresponding section. */ |
| 51 | return INTUSE(dwarf_formudata) (&attr, retp); |
| 52 | } |
| 53 | |
| 54 | static int |
| 55 | macro_op_compare (const void *p1, const void *p2) |
| 56 | { |
| 57 | const Dwarf_Macro_Op_Table *t1 = (const Dwarf_Macro_Op_Table *) p1; |
| 58 | const Dwarf_Macro_Op_Table *t2 = (const Dwarf_Macro_Op_Table *) p2; |
| 59 | |
| 60 | if (t1->offset < t2->offset) |
| 61 | return -1; |
| 62 | if (t1->offset > t2->offset) |
| 63 | return 1; |
| 64 | |
| 65 | if (t1->sec_index < t2->sec_index) |
| 66 | return -1; |
| 67 | if (t1->sec_index > t2->sec_index) |
| 68 | return 1; |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static void |
| 74 | build_table (Dwarf_Macro_Op_Table *table, |
| 75 | Dwarf_Macro_Op_Proto op_protos[static 255]) |
| 76 | { |
| 77 | unsigned ct = 0; |
| 78 | for (unsigned i = 1; i < 256; ++i) |
| 79 | if (op_protos[i - 1].forms != NULL) |
| 80 | table->table[table->opcodes[i - 1] = ct++] = op_protos[i - 1]; |
| 81 | else |
| 82 | table->opcodes[i - 1] = 0xff; |
| 83 | } |
| 84 | |
| 85 | #define MACRO_PROTO(NAME, ...) \ |
| 86 | Dwarf_Macro_Op_Proto NAME = ({ \ |
| 87 | static const uint8_t proto[] = {__VA_ARGS__}; \ |
| 88 | (Dwarf_Macro_Op_Proto) {sizeof proto, proto}; \ |
| 89 | }) |
| 90 | |
| 91 | enum { macinfo_data_size = offsetof (Dwarf_Macro_Op_Table, table[5]) }; |
| 92 | static unsigned char macinfo_data[macinfo_data_size] |
| 93 | __attribute__ ((aligned (__alignof (Dwarf_Macro_Op_Table)))); |
| 94 | |
| 95 | static __attribute__ ((constructor)) void |
| 96 | init_macinfo_table (void) |
| 97 | { |
| 98 | MACRO_PROTO (p_udata_str, DW_FORM_udata, DW_FORM_string); |
| 99 | MACRO_PROTO (p_udata_udata, DW_FORM_udata, DW_FORM_udata); |
| 100 | MACRO_PROTO (p_none); |
| 101 | |
| 102 | Dwarf_Macro_Op_Proto op_protos[255] = |
| 103 | { |
| 104 | [DW_MACINFO_define - 1] = p_udata_str, |
| 105 | [DW_MACINFO_undef - 1] = p_udata_str, |
| 106 | [DW_MACINFO_vendor_ext - 1] = p_udata_str, |
| 107 | [DW_MACINFO_start_file - 1] = p_udata_udata, |
| 108 | [DW_MACINFO_end_file - 1] = p_none, |
| 109 | /* If you are adding more elements to this array, increase |
| 110 | MACINFO_DATA_SIZE above. */ |
| 111 | }; |
| 112 | |
| 113 | Dwarf_Macro_Op_Table *macinfo_table = (void *) macinfo_data; |
| 114 | memset (macinfo_table, 0, sizeof macinfo_data); |
| 115 | build_table (macinfo_table, op_protos); |
| 116 | macinfo_table->sec_index = IDX_debug_macinfo; |
| 117 | } |
| 118 | |
| 119 | static Dwarf_Macro_Op_Table * |
| 120 | get_macinfo_table (Dwarf *dbg, Dwarf_Word macoff, Dwarf_Die *cudie) |
| 121 | { |
| 122 | assert (cudie != NULL); |
| 123 | |
| 124 | Dwarf_Attribute attr_mem, *attr |
| 125 | = INTUSE(dwarf_attr) (cudie, DW_AT_stmt_list, &attr_mem); |
| 126 | Dwarf_Off line_offset = (Dwarf_Off) -1; |
| 127 | if (attr != NULL) |
| 128 | INTUSE(dwarf_formudata) (attr, &line_offset); |
| 129 | |
| 130 | Dwarf_Macro_Op_Table *table = libdw_alloc (dbg, Dwarf_Macro_Op_Table, |
| 131 | macinfo_data_size, 1); |
| 132 | memcpy (table, macinfo_data, macinfo_data_size); |
| 133 | |
| 134 | table->offset = macoff; |
| 135 | table->sec_index = IDX_debug_macinfo; |
| 136 | table->line_offset = line_offset; |
| 137 | table->is_64bit = cudie->cu->address_size == 8; |
| 138 | table->comp_dir = __libdw_getcompdir (cudie); |
| 139 | |
| 140 | return table; |
| 141 | } |
| 142 | |
| 143 | static Dwarf_Macro_Op_Table * |
| 144 | get_table_for_offset (Dwarf *dbg, Dwarf_Word macoff, |
| 145 | const unsigned char *readp, |
| 146 | const unsigned char *const endp, |
| 147 | Dwarf_Die *cudie) |
| 148 | { |
| 149 | const unsigned char *startp = readp; |
| 150 | |
| 151 | /* Request at least 3 bytes for header. */ |
| 152 | if (readp + 3 > endp) |
| 153 | { |
| 154 | invalid_dwarf: |
| 155 | __libdw_seterrno (DWARF_E_INVALID_DWARF); |
| 156 | return NULL; |
| 157 | } |
| 158 | |
| 159 | uint16_t version = read_2ubyte_unaligned_inc (dbg, readp); |
| 160 | if (version != 4) |
| 161 | { |
| 162 | __libdw_seterrno (DWARF_E_INVALID_VERSION); |
| 163 | return NULL; |
| 164 | } |
| 165 | |
| 166 | uint8_t flags = *readp++; |
| 167 | bool is_64bit = (flags & 0x1) != 0; |
| 168 | |
| 169 | Dwarf_Off line_offset = (Dwarf_Off) -1; |
| 170 | if ((flags & 0x2) != 0) |
| 171 | { |
| 172 | line_offset = read_addr_unaligned_inc (is_64bit ? 8 : 4, dbg, readp); |
| 173 | if (readp > endp) |
| 174 | goto invalid_dwarf; |
| 175 | } |
| 176 | else if (cudie != NULL) |
| 177 | { |
| 178 | Dwarf_Attribute attr_mem, *attr |
| 179 | = INTUSE(dwarf_attr) (cudie, DW_AT_stmt_list, &attr_mem); |
| 180 | if (attr != NULL) |
| 181 | INTUSE(dwarf_formudata) (attr, &line_offset); |
| 182 | } |
| 183 | |
| 184 | /* """The macinfo entry types defined in this standard may, but |
| 185 | might not, be described in the table""". |
| 186 | |
| 187 | I.e. these may be present. It's tempting to simply skip them, |
| 188 | but it's probably more correct to tolerate that a producer tweaks |
| 189 | the way certain opcodes are encoded, for whatever reasons. */ |
| 190 | |
| 191 | MACRO_PROTO (p_udata_str, DW_FORM_udata, DW_FORM_string); |
| 192 | MACRO_PROTO (p_udata_strp, DW_FORM_udata, DW_FORM_strp); |
| 193 | MACRO_PROTO (p_udata_udata, DW_FORM_udata, DW_FORM_udata); |
| 194 | MACRO_PROTO (p_secoffset, DW_FORM_sec_offset); |
| 195 | MACRO_PROTO (p_none); |
| 196 | |
| 197 | Dwarf_Macro_Op_Proto op_protos[255] = |
| 198 | { |
| 199 | [DW_MACRO_GNU_define - 1] = p_udata_str, |
| 200 | [DW_MACRO_GNU_undef - 1] = p_udata_str, |
| 201 | [DW_MACRO_GNU_define_indirect - 1] = p_udata_strp, |
| 202 | [DW_MACRO_GNU_undef_indirect - 1] = p_udata_strp, |
| 203 | [DW_MACRO_GNU_start_file - 1] = p_udata_udata, |
| 204 | [DW_MACRO_GNU_end_file - 1] = p_none, |
| 205 | [DW_MACRO_GNU_transparent_include - 1] = p_secoffset, |
| 206 | /* N.B. DW_MACRO_undef_indirectx, DW_MACRO_define_indirectx |
| 207 | should be added when 130313.1 is supported. */ |
| 208 | }; |
| 209 | |
| 210 | if ((flags & 0x4) != 0) |
| 211 | { |
| 212 | unsigned count = *readp++; |
| 213 | for (unsigned i = 0; i < count; ++i) |
| 214 | { |
| 215 | unsigned opcode = *readp++; |
| 216 | |
| 217 | Dwarf_Macro_Op_Proto e; |
| 218 | get_uleb128 (e.nforms, readp); // XXX checking |
| 219 | e.forms = readp; |
| 220 | op_protos[opcode - 1] = e; |
| 221 | |
| 222 | readp += e.nforms; |
| 223 | if (readp > endp) |
| 224 | { |
| 225 | __libdw_seterrno (DWARF_E_INVALID_DWARF); |
| 226 | return NULL; |
| 227 | } |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | size_t ct = 0; |
| 232 | for (unsigned i = 1; i < 256; ++i) |
| 233 | if (op_protos[i - 1].forms != NULL) |
| 234 | ++ct; |
| 235 | |
| 236 | /* We support at most 0xfe opcodes defined in the table, as 0xff is |
| 237 | a value that means that given opcode is not stored at all. But |
| 238 | that should be fine, as opcode 0 is not allocated. */ |
| 239 | assert (ct < 0xff); |
| 240 | |
| 241 | size_t macop_table_size = offsetof (Dwarf_Macro_Op_Table, table[ct]); |
| 242 | |
| 243 | Dwarf_Macro_Op_Table *table = libdw_alloc (dbg, Dwarf_Macro_Op_Table, |
| 244 | macop_table_size, 1); |
| 245 | |
| 246 | *table = (Dwarf_Macro_Op_Table) { |
| 247 | .offset = macoff, |
| 248 | .sec_index = IDX_debug_macro, |
| 249 | .line_offset = line_offset, |
| 250 | .header_len = readp - startp, |
| 251 | .version = version, |
| 252 | .is_64bit = is_64bit, |
| 253 | |
| 254 | /* NULL if CUDIE is NULL or DW_AT_comp_dir is absent. */ |
| 255 | .comp_dir = __libdw_getcompdir (cudie), |
| 256 | }; |
| 257 | build_table (table, op_protos); |
| 258 | |
| 259 | return table; |
| 260 | } |
| 261 | |
| 262 | static Dwarf_Macro_Op_Table * |
| 263 | cache_op_table (Dwarf *dbg, int sec_index, Dwarf_Off macoff, |
| 264 | const unsigned char *startp, |
| 265 | const unsigned char *const endp, |
| 266 | Dwarf_Die *cudie) |
| 267 | { |
| 268 | Dwarf_Macro_Op_Table fake = { .offset = macoff, .sec_index = sec_index }; |
| 269 | Dwarf_Macro_Op_Table **found = tfind (&fake, &dbg->macro_ops, |
| 270 | macro_op_compare); |
| 271 | if (found != NULL) |
| 272 | return *found; |
| 273 | |
| 274 | Dwarf_Macro_Op_Table *table = sec_index == IDX_debug_macro |
| 275 | ? get_table_for_offset (dbg, macoff, startp, endp, cudie) |
| 276 | : get_macinfo_table (dbg, macoff, cudie); |
| 277 | |
| 278 | if (table == NULL) |
| 279 | return NULL; |
| 280 | |
| 281 | Dwarf_Macro_Op_Table **ret = tsearch (table, &dbg->macro_ops, |
| 282 | macro_op_compare); |
| 283 | if (unlikely (ret == NULL)) |
| 284 | { |
| 285 | __libdw_seterrno (DWARF_E_NOMEM); |
| 286 | return NULL; |
| 287 | } |
| 288 | |
| 289 | return *ret; |
| 290 | } |
| 291 | |
| 292 | static ptrdiff_t |
| 293 | read_macros (Dwarf *dbg, int sec_index, |
| 294 | Dwarf_Off macoff, int (*callback) (Dwarf_Macro *, void *), |
| 295 | void *arg, ptrdiff_t offset, bool accept_0xff, |
| 296 | Dwarf_Die *cudie) |
| 297 | { |
| 298 | Elf_Data *d = dbg->sectiondata[sec_index]; |
| 299 | if (unlikely (d == NULL || d->d_buf == NULL)) |
| 300 | { |
| 301 | __libdw_seterrno (DWARF_E_NO_ENTRY); |
| 302 | return -1; |
| 303 | } |
| 304 | |
| 305 | if (unlikely (macoff >= d->d_size)) |
| 306 | { |
| 307 | __libdw_seterrno (DWARF_E_INVALID_DWARF); |
| 308 | return -1; |
| 309 | } |
| 310 | |
| 311 | const unsigned char *const startp = d->d_buf + macoff; |
| 312 | const unsigned char *const endp = d->d_buf + d->d_size; |
| 313 | |
| 314 | Dwarf_Macro_Op_Table *table = cache_op_table (dbg, sec_index, macoff, |
| 315 | startp, endp, cudie); |
| 316 | if (table == NULL) |
| 317 | return -1; |
| 318 | |
| 319 | if (offset == 0) |
| 320 | offset = table->header_len; |
| 321 | |
| 322 | assert (offset >= 0); |
| 323 | assert (offset < endp - startp); |
| 324 | const unsigned char *readp = startp + offset; |
| 325 | |
| 326 | while (readp < endp) |
| 327 | { |
| 328 | unsigned int opcode = *readp++; |
| 329 | if (opcode == 0) |
| 330 | /* Nothing more to do. */ |
| 331 | return 0; |
| 332 | |
| 333 | if (unlikely (opcode == 0xff && ! accept_0xff)) |
| 334 | { |
| 335 | /* See comment below at dwarf_getmacros for explanation of |
| 336 | why we are doing this. */ |
| 337 | __libdw_seterrno (DWARF_E_INVALID_OPCODE); |
| 338 | return -1; |
| 339 | } |
| 340 | |
| 341 | unsigned int idx = table->opcodes[opcode - 1]; |
| 342 | if (idx == 0xff) |
| 343 | { |
| 344 | __libdw_seterrno (DWARF_E_INVALID_OPCODE); |
| 345 | return -1; |
| 346 | } |
| 347 | |
| 348 | Dwarf_Macro_Op_Proto *proto = &table->table[idx]; |
| 349 | |
| 350 | /* A fake CU with bare minimum data to fool dwarf_formX into |
| 351 | doing the right thing with the attributes that we put out. |
| 352 | We arbitrarily pretend it's version 4. */ |
| 353 | Dwarf_CU fake_cu = { |
| 354 | .dbg = dbg, |
| 355 | .version = 4, |
| 356 | .offset_size = table->is_64bit ? 8 : 4, |
| 357 | }; |
| 358 | |
| 359 | Dwarf_Attribute attributes[proto->nforms]; |
| 360 | for (Dwarf_Word i = 0; i < proto->nforms; ++i) |
| 361 | { |
| 362 | /* We pretend this is a DW_AT_GNU_macros attribute so that |
| 363 | DW_FORM_sec_offset forms get correctly interpreted as |
| 364 | offset into .debug_macro. */ |
| 365 | attributes[i].code = DW_AT_GNU_macros; |
| 366 | attributes[i].form = proto->forms[i]; |
| 367 | attributes[i].valp = (void *) readp; |
| 368 | attributes[i].cu = &fake_cu; |
| 369 | |
Mark Wielaard | cb73b5a | 2014-12-04 21:43:44 +0100 | [diff] [blame^] | 370 | size_t len = __libdw_form_val_len (dbg, &fake_cu, |
| 371 | proto->forms[i], readp, endp); |
| 372 | if (len == (size_t) -1) |
| 373 | return -1; |
| 374 | |
| 375 | readp += len; |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | Dwarf_Macro macro = { |
| 379 | .table = table, |
| 380 | .opcode = opcode, |
| 381 | .attributes = attributes, |
| 382 | }; |
| 383 | |
| 384 | if (callback (¯o, arg) != DWARF_CB_OK) |
| 385 | return readp - startp; |
| 386 | } |
| 387 | |
| 388 | return 0; |
| 389 | } |
| 390 | |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 391 | /* Token layout: |
| 392 | |
| 393 | - The highest bit is used for distinguishing between callers that |
| 394 | know that opcode 0xff may have one of two incompatible meanings. |
| 395 | The mask that we use for selecting this bit is |
| 396 | DWARF_GETMACROS_START. |
| 397 | |
| 398 | - The rest of the token (31 or 63 bits) encodes address inside the |
| 399 | macro unit. |
| 400 | |
| 401 | Besides, token value of 0 signals end of iteration and -1 is |
| 402 | reserved for signaling errors. That means it's impossible to |
| 403 | represent maximum offset of a .debug_macro unit to new-style |
| 404 | callers (which in practice decreases the permissible macro unit |
| 405 | size by another 1 byte). */ |
| 406 | |
| 407 | static ptrdiff_t |
| 408 | token_from_offset (ptrdiff_t offset, bool accept_0xff) |
| 409 | { |
| 410 | if (offset == -1 || offset == 0) |
| 411 | return offset; |
| 412 | |
| 413 | /* Make sure the offset didn't overflow into the flag bit. */ |
| 414 | if ((offset & DWARF_GETMACROS_START) != 0) |
| 415 | { |
| 416 | __libdw_seterrno (DWARF_E_TOO_BIG); |
| 417 | return -1; |
| 418 | } |
| 419 | |
| 420 | if (accept_0xff) |
| 421 | offset |= DWARF_GETMACROS_START; |
| 422 | |
| 423 | return offset; |
| 424 | } |
| 425 | |
| 426 | static ptrdiff_t |
| 427 | offset_from_token (ptrdiff_t token, bool *accept_0xffp) |
| 428 | { |
| 429 | *accept_0xffp = (token & DWARF_GETMACROS_START) != 0; |
| 430 | token &= ~DWARF_GETMACROS_START; |
| 431 | |
| 432 | return token; |
| 433 | } |
| 434 | |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 435 | static ptrdiff_t |
| 436 | gnu_macros_getmacros_off (Dwarf *dbg, Dwarf_Off macoff, |
| 437 | int (*callback) (Dwarf_Macro *, void *), |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 438 | void *arg, ptrdiff_t offset, bool accept_0xff, |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 439 | Dwarf_Die *cudie) |
| 440 | { |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 441 | assert (offset >= 0); |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 442 | |
| 443 | if (macoff >= dbg->sectiondata[IDX_debug_macro]->d_size) |
| 444 | { |
| 445 | __libdw_seterrno (DWARF_E_INVALID_OFFSET); |
| 446 | return -1; |
| 447 | } |
| 448 | |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 449 | return read_macros (dbg, IDX_debug_macro, macoff, |
| 450 | callback, arg, offset, accept_0xff, cudie); |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 451 | } |
| 452 | |
| 453 | static ptrdiff_t |
| 454 | macro_info_getmacros_off (Dwarf *dbg, Dwarf_Off macoff, |
| 455 | int (*callback) (Dwarf_Macro *, void *), |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 456 | void *arg, ptrdiff_t offset, Dwarf_Die *cudie) |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 457 | { |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 458 | assert (offset >= 0); |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 459 | |
| 460 | return read_macros (dbg, IDX_debug_macinfo, macoff, |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 461 | callback, arg, offset, true, cudie); |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | ptrdiff_t |
| 465 | dwarf_getmacros_off (Dwarf *dbg, Dwarf_Off macoff, |
| 466 | int (*callback) (Dwarf_Macro *, void *), |
| 467 | void *arg, ptrdiff_t token) |
| 468 | { |
| 469 | if (dbg == NULL) |
| 470 | { |
| 471 | __libdw_seterrno (DWARF_E_NO_DWARF); |
| 472 | return -1; |
| 473 | } |
| 474 | |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 475 | bool accept_0xff; |
| 476 | ptrdiff_t offset = offset_from_token (token, &accept_0xff); |
| 477 | assert (accept_0xff); |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 478 | |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 479 | offset = gnu_macros_getmacros_off (dbg, macoff, callback, arg, offset, |
| 480 | accept_0xff, NULL); |
| 481 | |
| 482 | return token_from_offset (offset, accept_0xff); |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 483 | } |
| 484 | |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 485 | ptrdiff_t |
| 486 | dwarf_getmacros (cudie, callback, arg, token) |
| 487 | Dwarf_Die *cudie; |
| 488 | int (*callback) (Dwarf_Macro *, void *); |
| 489 | void *arg; |
| 490 | ptrdiff_t token; |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 491 | { |
| 492 | if (cudie == NULL) |
| 493 | { |
| 494 | __libdw_seterrno (DWARF_E_NO_DWARF); |
| 495 | return -1; |
| 496 | } |
| 497 | |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 498 | /* This function might be called from a code that expects to see |
| 499 | DW_MACINFO_* opcodes, not DW_MACRO_{GNU_,}* ones. It is fine to |
| 500 | serve most DW_MACRO_{GNU_,}* opcodes to such code, because those |
| 501 | whose values are the same as DW_MACINFO_* ones also have the same |
| 502 | behavior. It is not very likely that a .debug_macro section |
| 503 | would only use the part of opcode space that it shares with |
| 504 | .debug_macinfo, but it is possible. Serving the opcodes that are |
| 505 | only valid in DW_MACRO_{GNU_,}* domain is OK as well, because |
| 506 | clients in general need to be ready that newer standards define |
| 507 | more opcodes, and have coping mechanisms for unfamiliar opcodes. |
Roland McGrath | e7c1633 | 2009-05-07 18:57:18 -0700 | [diff] [blame] | 508 | |
Petr Machata | fb90bf3 | 2014-10-17 02:47:03 +0200 | [diff] [blame] | 509 | The one exception to the above rule is opcode 0xff, which has |
| 510 | concrete semantics in .debug_macinfo, but falls into vendor block |
| 511 | in .debug_macro, and can be assigned to do whatever. There is |
| 512 | some small probability that the two opcodes would look |
| 513 | superficially similar enough that a client would be confused and |
| 514 | misbehave as a result. For this reason, we refuse to serve |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 515 | through this interface 0xff's originating from .debug_macro |
| 516 | unless the TOKEN that we obtained indicates the call originates |
| 517 | from a new-style caller. See above for details on what |
| 518 | information is encoded into tokens. */ |
Petr Machata | f3df61f | 2009-05-07 21:02:33 +0200 | [diff] [blame] | 519 | |
Petr Machata | edb079a | 2014-12-02 21:22:14 +0100 | [diff] [blame] | 520 | bool accept_0xff; |
| 521 | ptrdiff_t offset = offset_from_token (token, &accept_0xff); |
| 522 | |
| 523 | /* DW_AT_macro_info */ |
| 524 | if (dwarf_hasattr (cudie, DW_AT_macro_info)) |
| 525 | { |
| 526 | Dwarf_Word macoff; |
| 527 | if (get_offset_from (cudie, DW_AT_macro_info, &macoff) != 0) |
| 528 | return -1; |
| 529 | offset = macro_info_getmacros_off (cudie->cu->dbg, macoff, |
| 530 | callback, arg, offset, cudie); |
| 531 | } |
| 532 | else |
| 533 | { |
| 534 | /* DW_AT_GNU_macros, DW_AT_macros */ |
| 535 | Dwarf_Word macoff; |
| 536 | if (get_offset_from (cudie, DW_AT_GNU_macros, &macoff) != 0) |
| 537 | return -1; |
| 538 | offset = gnu_macros_getmacros_off (cudie->cu->dbg, macoff, |
| 539 | callback, arg, offset, accept_0xff, |
| 540 | cudie); |
| 541 | } |
| 542 | |
| 543 | return token_from_offset (offset, accept_0xff); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 544 | } |