Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 1 | /* |
| 2 | * dwarf-aux.c : libdw auxiliary interfaces |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <stdbool.h> |
| 21 | #include "util.h" |
| 22 | #include "debug.h" |
| 23 | #include "dwarf-aux.h" |
| 24 | |
| 25 | /** |
| 26 | * cu_find_realpath - Find the realpath of the target file |
| 27 | * @cu_die: A DIE(dwarf information entry) of CU(compilation Unit) |
| 28 | * @fname: The tail filename of the target file |
| 29 | * |
| 30 | * Find the real(long) path of @fname in @cu_die. |
| 31 | */ |
| 32 | const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) |
| 33 | { |
| 34 | Dwarf_Files *files; |
| 35 | size_t nfiles, i; |
| 36 | const char *src = NULL; |
| 37 | int ret; |
| 38 | |
| 39 | if (!fname) |
| 40 | return NULL; |
| 41 | |
| 42 | ret = dwarf_getsrcfiles(cu_die, &files, &nfiles); |
| 43 | if (ret != 0) |
| 44 | return NULL; |
| 45 | |
| 46 | for (i = 0; i < nfiles; i++) { |
| 47 | src = dwarf_filesrc(files, i, NULL, NULL); |
| 48 | if (strtailcmp(src, fname) == 0) |
| 49 | break; |
| 50 | } |
| 51 | if (i == nfiles) |
| 52 | return NULL; |
| 53 | return src; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * cu_get_comp_dir - Get the path of compilation directory |
| 58 | * @cu_die: a CU DIE |
| 59 | * |
| 60 | * Get the path of compilation directory of given @cu_die. |
| 61 | * Since this depends on DW_AT_comp_dir, older gcc will not |
| 62 | * embedded it. In that case, this returns NULL. |
| 63 | */ |
| 64 | const char *cu_get_comp_dir(Dwarf_Die *cu_die) |
| 65 | { |
| 66 | Dwarf_Attribute attr; |
| 67 | if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) |
| 68 | return NULL; |
| 69 | return dwarf_formstring(&attr); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * cu_find_lineinfo - Get a line number and file name for given address |
| 74 | * @cu_die: a CU DIE |
| 75 | * @addr: An address |
| 76 | * @fname: a pointer which returns the file name string |
| 77 | * @lineno: a pointer which returns the line number |
| 78 | * |
| 79 | * Find a line number and file name for @addr in @cu_die. |
| 80 | */ |
| 81 | int cu_find_lineinfo(Dwarf_Die *cu_die, unsigned long addr, |
| 82 | const char **fname, int *lineno) |
| 83 | { |
| 84 | Dwarf_Line *line; |
| 85 | Dwarf_Addr laddr; |
| 86 | |
| 87 | line = dwarf_getsrc_die(cu_die, (Dwarf_Addr)addr); |
| 88 | if (line && dwarf_lineaddr(line, &laddr) == 0 && |
| 89 | addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) { |
| 90 | *fname = dwarf_linesrc(line, NULL, NULL); |
| 91 | if (!*fname) |
| 92 | /* line number is useless without filename */ |
| 93 | *lineno = 0; |
| 94 | } |
| 95 | |
| 96 | return *lineno ?: -ENOENT; |
| 97 | } |
| 98 | |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 99 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data); |
| 100 | |
| 101 | /** |
| 102 | * cu_walk_functions_at - Walk on function DIEs at given address |
| 103 | * @cu_die: A CU DIE |
| 104 | * @addr: An address |
| 105 | * @callback: A callback which called with found DIEs |
| 106 | * @data: A user data |
| 107 | * |
| 108 | * Walk on function DIEs at given @addr in @cu_die. Passed DIEs |
| 109 | * should be subprogram or inlined-subroutines. |
| 110 | */ |
| 111 | int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr, |
| 112 | int (*callback)(Dwarf_Die *, void *), void *data) |
| 113 | { |
| 114 | Dwarf_Die die_mem; |
| 115 | Dwarf_Die *sc_die; |
| 116 | int ret = -ENOENT; |
| 117 | |
| 118 | /* Inlined function could be recursive. Trace it until fail */ |
| 119 | for (sc_die = die_find_realfunc(cu_die, addr, &die_mem); |
| 120 | sc_die != NULL; |
| 121 | sc_die = die_find_child(sc_die, __die_find_inline_cb, &addr, |
| 122 | &die_mem)) { |
| 123 | ret = callback(sc_die, data); |
| 124 | if (ret) |
| 125 | break; |
| 126 | } |
| 127 | |
| 128 | return ret; |
| 129 | |
| 130 | } |
| 131 | |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 132 | /** |
Masami Hiramatsu | d5a0029 | 2016-09-24 00:35:31 +0900 | [diff] [blame] | 133 | * die_get_linkage_name - Get the linkage name of the object |
| 134 | * @dw_die: A DIE of the object |
| 135 | * |
| 136 | * Get the linkage name attiribute of given @dw_die. |
| 137 | * For C++ binary, the linkage name will be the mangled symbol. |
| 138 | */ |
| 139 | const char *die_get_linkage_name(Dwarf_Die *dw_die) |
| 140 | { |
| 141 | Dwarf_Attribute attr; |
| 142 | |
| 143 | if (dwarf_attr_integrate(dw_die, DW_AT_linkage_name, &attr) == NULL) |
| 144 | return NULL; |
| 145 | return dwarf_formstring(&attr); |
| 146 | } |
| 147 | |
| 148 | /** |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 149 | * die_compare_name - Compare diename and tname |
| 150 | * @dw_die: a DIE |
| 151 | * @tname: a string of target name |
| 152 | * |
| 153 | * Compare the name of @dw_die and @tname. Return false if @dw_die has no name. |
| 154 | */ |
| 155 | bool die_compare_name(Dwarf_Die *dw_die, const char *tname) |
| 156 | { |
| 157 | const char *name; |
Masami Hiramatsu | 4c85935 | 2015-05-08 10:03:35 +0900 | [diff] [blame] | 158 | |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 159 | name = dwarf_diename(dw_die); |
| 160 | return name ? (strcmp(tname, name) == 0) : false; |
| 161 | } |
| 162 | |
| 163 | /** |
Masami Hiramatsu | d5a0029 | 2016-09-24 00:35:31 +0900 | [diff] [blame] | 164 | * die_match_name - Match diename/linkage name and glob |
Masami Hiramatsu | 4c85935 | 2015-05-08 10:03:35 +0900 | [diff] [blame] | 165 | * @dw_die: a DIE |
| 166 | * @glob: a string of target glob pattern |
| 167 | * |
| 168 | * Glob matching the name of @dw_die and @glob. Return false if matching fail. |
Masami Hiramatsu | d5a0029 | 2016-09-24 00:35:31 +0900 | [diff] [blame] | 169 | * This also match linkage name. |
Masami Hiramatsu | 4c85935 | 2015-05-08 10:03:35 +0900 | [diff] [blame] | 170 | */ |
| 171 | bool die_match_name(Dwarf_Die *dw_die, const char *glob) |
| 172 | { |
| 173 | const char *name; |
| 174 | |
| 175 | name = dwarf_diename(dw_die); |
Masami Hiramatsu | d5a0029 | 2016-09-24 00:35:31 +0900 | [diff] [blame] | 176 | if (name && strglobmatch(name, glob)) |
| 177 | return true; |
| 178 | /* fall back to check linkage name */ |
| 179 | name = die_get_linkage_name(dw_die); |
| 180 | if (name && strglobmatch(name, glob)) |
| 181 | return true; |
| 182 | |
| 183 | return false; |
Masami Hiramatsu | 4c85935 | 2015-05-08 10:03:35 +0900 | [diff] [blame] | 184 | } |
| 185 | |
| 186 | /** |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 187 | * die_get_call_lineno - Get callsite line number of inline-function instance |
| 188 | * @in_die: a DIE of an inlined function instance |
| 189 | * |
| 190 | * Get call-site line number of @in_die. This means from where the inline |
| 191 | * function is called. |
| 192 | */ |
| 193 | int die_get_call_lineno(Dwarf_Die *in_die) |
| 194 | { |
| 195 | Dwarf_Attribute attr; |
| 196 | Dwarf_Word ret; |
| 197 | |
| 198 | if (!dwarf_attr(in_die, DW_AT_call_line, &attr)) |
| 199 | return -ENOENT; |
| 200 | |
| 201 | dwarf_formudata(&attr, &ret); |
| 202 | return (int)ret; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * die_get_type - Get type DIE |
| 207 | * @vr_die: a DIE of a variable |
| 208 | * @die_mem: where to store a type DIE |
| 209 | * |
| 210 | * Get a DIE of the type of given variable (@vr_die), and store |
| 211 | * it to die_mem. Return NULL if fails to get a type DIE. |
| 212 | */ |
| 213 | Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) |
| 214 | { |
| 215 | Dwarf_Attribute attr; |
| 216 | |
| 217 | if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) && |
| 218 | dwarf_formref_die(&attr, die_mem)) |
| 219 | return die_mem; |
| 220 | else |
| 221 | return NULL; |
| 222 | } |
| 223 | |
| 224 | /* Get a type die, but skip qualifiers */ |
| 225 | static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) |
| 226 | { |
| 227 | int tag; |
| 228 | |
| 229 | do { |
| 230 | vr_die = die_get_type(vr_die, die_mem); |
| 231 | if (!vr_die) |
| 232 | break; |
| 233 | tag = dwarf_tag(vr_die); |
| 234 | } while (tag == DW_TAG_const_type || |
| 235 | tag == DW_TAG_restrict_type || |
| 236 | tag == DW_TAG_volatile_type || |
| 237 | tag == DW_TAG_shared_type); |
| 238 | |
| 239 | return vr_die; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * die_get_real_type - Get a type die, but skip qualifiers and typedef |
| 244 | * @vr_die: a DIE of a variable |
| 245 | * @die_mem: where to store a type DIE |
| 246 | * |
| 247 | * Get a DIE of the type of given variable (@vr_die), and store |
| 248 | * it to die_mem. Return NULL if fails to get a type DIE. |
| 249 | * If the type is qualifiers (e.g. const) or typedef, this skips it |
| 250 | * and tries to find real type (structure or basic types, e.g. int). |
| 251 | */ |
| 252 | Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) |
| 253 | { |
| 254 | do { |
| 255 | vr_die = __die_get_real_type(vr_die, die_mem); |
| 256 | } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef); |
| 257 | |
| 258 | return vr_die; |
| 259 | } |
| 260 | |
| 261 | /* Get attribute and translate it as a udata */ |
| 262 | static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name, |
| 263 | Dwarf_Word *result) |
| 264 | { |
| 265 | Dwarf_Attribute attr; |
| 266 | |
| 267 | if (dwarf_attr(tp_die, attr_name, &attr) == NULL || |
| 268 | dwarf_formudata(&attr, result) != 0) |
| 269 | return -ENOENT; |
| 270 | |
| 271 | return 0; |
| 272 | } |
| 273 | |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 274 | /* Get attribute and translate it as a sdata */ |
| 275 | static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name, |
| 276 | Dwarf_Sword *result) |
| 277 | { |
| 278 | Dwarf_Attribute attr; |
| 279 | |
| 280 | if (dwarf_attr(tp_die, attr_name, &attr) == NULL || |
| 281 | dwarf_formsdata(&attr, result) != 0) |
| 282 | return -ENOENT; |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 287 | /** |
| 288 | * die_is_signed_type - Check whether a type DIE is signed or not |
| 289 | * @tp_die: a DIE of a type |
| 290 | * |
| 291 | * Get the encoding of @tp_die and return true if the encoding |
| 292 | * is signed. |
| 293 | */ |
| 294 | bool die_is_signed_type(Dwarf_Die *tp_die) |
| 295 | { |
| 296 | Dwarf_Word ret; |
| 297 | |
| 298 | if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret)) |
| 299 | return false; |
| 300 | |
| 301 | return (ret == DW_ATE_signed_char || ret == DW_ATE_signed || |
| 302 | ret == DW_ATE_signed_fixed); |
| 303 | } |
| 304 | |
| 305 | /** |
Masami Hiramatsu | 0dbb1ca | 2012-04-23 12:24:36 +0900 | [diff] [blame] | 306 | * die_is_func_def - Ensure that this DIE is a subprogram and definition |
| 307 | * @dw_die: a DIE |
| 308 | * |
| 309 | * Ensure that this DIE is a subprogram and NOT a declaration. This |
| 310 | * returns true if @dw_die is a function definition. |
| 311 | **/ |
| 312 | bool die_is_func_def(Dwarf_Die *dw_die) |
| 313 | { |
| 314 | Dwarf_Attribute attr; |
| 315 | |
| 316 | return (dwarf_tag(dw_die) == DW_TAG_subprogram && |
| 317 | dwarf_attr(dw_die, DW_AT_declaration, &attr) == NULL); |
| 318 | } |
| 319 | |
| 320 | /** |
Masami Hiramatsu | e1ecbbc | 2015-01-30 18:37:44 +0900 | [diff] [blame] | 321 | * die_is_func_instance - Ensure that this DIE is an instance of a subprogram |
| 322 | * @dw_die: a DIE |
| 323 | * |
| 324 | * Ensure that this DIE is an instance (which has an entry address). |
| 325 | * This returns true if @dw_die is a function instance. If not, you need to |
| 326 | * call die_walk_instances() to find actual instances. |
| 327 | **/ |
| 328 | bool die_is_func_instance(Dwarf_Die *dw_die) |
| 329 | { |
| 330 | Dwarf_Addr tmp; |
| 331 | |
| 332 | /* Actually gcc optimizes non-inline as like as inlined */ |
| 333 | return !dwarf_func_inline(dw_die) && dwarf_entrypc(dw_die, &tmp) == 0; |
| 334 | } |
| 335 | /** |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 336 | * die_get_data_member_location - Get the data-member offset |
| 337 | * @mb_die: a DIE of a member of a data structure |
| 338 | * @offs: The offset of the member in the data structure |
| 339 | * |
| 340 | * Get the offset of @mb_die in the data structure including @mb_die, and |
| 341 | * stores result offset to @offs. If any error occurs this returns errno. |
| 342 | */ |
| 343 | int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) |
| 344 | { |
| 345 | Dwarf_Attribute attr; |
| 346 | Dwarf_Op *expr; |
| 347 | size_t nexpr; |
| 348 | int ret; |
| 349 | |
| 350 | if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL) |
| 351 | return -ENOENT; |
| 352 | |
| 353 | if (dwarf_formudata(&attr, offs) != 0) { |
| 354 | /* DW_AT_data_member_location should be DW_OP_plus_uconst */ |
| 355 | ret = dwarf_getlocation(&attr, &expr, &nexpr); |
| 356 | if (ret < 0 || nexpr == 0) |
| 357 | return -ENOENT; |
| 358 | |
| 359 | if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) { |
| 360 | pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n", |
| 361 | expr[0].atom, nexpr); |
| 362 | return -ENOTSUP; |
| 363 | } |
| 364 | *offs = (Dwarf_Word)expr[0].number; |
| 365 | } |
| 366 | return 0; |
| 367 | } |
| 368 | |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 369 | /* Get the call file index number in CU DIE */ |
| 370 | static int die_get_call_fileno(Dwarf_Die *in_die) |
| 371 | { |
| 372 | Dwarf_Sword idx; |
| 373 | |
| 374 | if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0) |
| 375 | return (int)idx; |
| 376 | else |
| 377 | return -ENOENT; |
| 378 | } |
| 379 | |
Masami Hiramatsu | 3f4460a | 2011-08-11 20:03:18 +0900 | [diff] [blame] | 380 | /* Get the declared file index number in CU DIE */ |
| 381 | static int die_get_decl_fileno(Dwarf_Die *pdie) |
| 382 | { |
| 383 | Dwarf_Sword idx; |
| 384 | |
| 385 | if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0) |
| 386 | return (int)idx; |
| 387 | else |
| 388 | return -ENOENT; |
| 389 | } |
| 390 | |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 391 | /** |
| 392 | * die_get_call_file - Get callsite file name of inlined function instance |
| 393 | * @in_die: a DIE of an inlined function instance |
| 394 | * |
| 395 | * Get call-site file name of @in_die. This means from which file the inline |
| 396 | * function is called. |
| 397 | */ |
| 398 | const char *die_get_call_file(Dwarf_Die *in_die) |
| 399 | { |
| 400 | Dwarf_Die cu_die; |
| 401 | Dwarf_Files *files; |
| 402 | int idx; |
| 403 | |
| 404 | idx = die_get_call_fileno(in_die); |
| 405 | if (idx < 0 || !dwarf_diecu(in_die, &cu_die, NULL, NULL) || |
| 406 | dwarf_getsrcfiles(&cu_die, &files, NULL) != 0) |
| 407 | return NULL; |
| 408 | |
| 409 | return dwarf_filesrc(files, idx, NULL, NULL); |
| 410 | } |
| 411 | |
| 412 | |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 413 | /** |
| 414 | * die_find_child - Generic DIE search function in DIE tree |
| 415 | * @rt_die: a root DIE |
| 416 | * @callback: a callback function |
| 417 | * @data: a user data passed to the callback function |
| 418 | * @die_mem: a buffer for result DIE |
| 419 | * |
| 420 | * Trace DIE tree from @rt_die and call @callback for each child DIE. |
| 421 | * If @callback returns DIE_FIND_CB_END, this stores the DIE into |
| 422 | * @die_mem and returns it. If @callback returns DIE_FIND_CB_CONTINUE, |
| 423 | * this continues to trace the tree. Optionally, @callback can return |
| 424 | * DIE_FIND_CB_CHILD and DIE_FIND_CB_SIBLING, those means trace only |
| 425 | * the children and trace only the siblings respectively. |
| 426 | * Returns NULL if @callback can't find any appropriate DIE. |
| 427 | */ |
| 428 | Dwarf_Die *die_find_child(Dwarf_Die *rt_die, |
| 429 | int (*callback)(Dwarf_Die *, void *), |
| 430 | void *data, Dwarf_Die *die_mem) |
| 431 | { |
| 432 | Dwarf_Die child_die; |
| 433 | int ret; |
| 434 | |
| 435 | ret = dwarf_child(rt_die, die_mem); |
| 436 | if (ret != 0) |
| 437 | return NULL; |
| 438 | |
| 439 | do { |
| 440 | ret = callback(die_mem, data); |
| 441 | if (ret == DIE_FIND_CB_END) |
| 442 | return die_mem; |
| 443 | |
| 444 | if ((ret & DIE_FIND_CB_CHILD) && |
| 445 | die_find_child(die_mem, callback, data, &child_die)) { |
| 446 | memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); |
| 447 | return die_mem; |
| 448 | } |
| 449 | } while ((ret & DIE_FIND_CB_SIBLING) && |
| 450 | dwarf_siblingof(die_mem, die_mem) == 0); |
| 451 | |
| 452 | return NULL; |
| 453 | } |
| 454 | |
| 455 | struct __addr_die_search_param { |
| 456 | Dwarf_Addr addr; |
| 457 | Dwarf_Die *die_mem; |
| 458 | }; |
| 459 | |
Naveen N. Rao | d4c537e | 2015-04-30 17:12:31 +0530 | [diff] [blame] | 460 | static int __die_search_func_tail_cb(Dwarf_Die *fn_die, void *data) |
| 461 | { |
| 462 | struct __addr_die_search_param *ad = data; |
| 463 | Dwarf_Addr addr = 0; |
| 464 | |
| 465 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
| 466 | !dwarf_highpc(fn_die, &addr) && |
| 467 | addr == ad->addr) { |
| 468 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); |
| 469 | return DWARF_CB_ABORT; |
| 470 | } |
| 471 | return DWARF_CB_OK; |
| 472 | } |
| 473 | |
| 474 | /** |
| 475 | * die_find_tailfunc - Search for a non-inlined function with tail call at |
| 476 | * given address |
| 477 | * @cu_die: a CU DIE which including @addr |
| 478 | * @addr: target address |
| 479 | * @die_mem: a buffer for result DIE |
| 480 | * |
| 481 | * Search for a non-inlined function DIE with tail call at @addr. Stores the |
| 482 | * DIE to @die_mem and returns it if found. Returns NULL if failed. |
| 483 | */ |
| 484 | Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr, |
| 485 | Dwarf_Die *die_mem) |
| 486 | { |
| 487 | struct __addr_die_search_param ad; |
| 488 | ad.addr = addr; |
| 489 | ad.die_mem = die_mem; |
| 490 | /* dwarf_getscopes can't find subprogram. */ |
| 491 | if (!dwarf_getfuncs(cu_die, __die_search_func_tail_cb, &ad, 0)) |
| 492 | return NULL; |
| 493 | else |
| 494 | return die_mem; |
| 495 | } |
| 496 | |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 497 | /* die_find callback for non-inlined function search */ |
| 498 | static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) |
| 499 | { |
| 500 | struct __addr_die_search_param *ad = data; |
| 501 | |
Masami Hiramatsu | 0dbb1ca | 2012-04-23 12:24:36 +0900 | [diff] [blame] | 502 | /* |
| 503 | * Since a declaration entry doesn't has given pc, this always returns |
| 504 | * function definition entry. |
| 505 | */ |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 506 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
| 507 | dwarf_haspc(fn_die, ad->addr)) { |
| 508 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); |
| 509 | return DWARF_CB_ABORT; |
| 510 | } |
| 511 | return DWARF_CB_OK; |
| 512 | } |
| 513 | |
| 514 | /** |
| 515 | * die_find_realfunc - Search a non-inlined function at given address |
| 516 | * @cu_die: a CU DIE which including @addr |
| 517 | * @addr: target address |
| 518 | * @die_mem: a buffer for result DIE |
| 519 | * |
| 520 | * Search a non-inlined function DIE which includes @addr. Stores the |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 521 | * DIE to @die_mem and returns it if found. Returns NULL if failed. |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 522 | */ |
| 523 | Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr, |
| 524 | Dwarf_Die *die_mem) |
| 525 | { |
| 526 | struct __addr_die_search_param ad; |
| 527 | ad.addr = addr; |
| 528 | ad.die_mem = die_mem; |
| 529 | /* dwarf_getscopes can't find subprogram. */ |
| 530 | if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) |
| 531 | return NULL; |
| 532 | else |
| 533 | return die_mem; |
| 534 | } |
| 535 | |
| 536 | /* die_find callback for inline function search */ |
| 537 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data) |
| 538 | { |
| 539 | Dwarf_Addr *addr = data; |
| 540 | |
| 541 | if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && |
| 542 | dwarf_haspc(die_mem, *addr)) |
| 543 | return DIE_FIND_CB_END; |
| 544 | |
| 545 | return DIE_FIND_CB_CONTINUE; |
| 546 | } |
| 547 | |
| 548 | /** |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 549 | * die_find_top_inlinefunc - Search the top inlined function at given address |
| 550 | * @sp_die: a subprogram DIE which including @addr |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 551 | * @addr: target address |
| 552 | * @die_mem: a buffer for result DIE |
| 553 | * |
| 554 | * Search an inlined function DIE which includes @addr. Stores the |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 555 | * DIE to @die_mem and returns it if found. Returns NULL if failed. |
| 556 | * Even if several inlined functions are expanded recursively, this |
| 557 | * doesn't trace it down, and returns the topmost one. |
| 558 | */ |
| 559 | Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, |
| 560 | Dwarf_Die *die_mem) |
| 561 | { |
| 562 | return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem); |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * die_find_inlinefunc - Search an inlined function at given address |
| 567 | * @sp_die: a subprogram DIE which including @addr |
| 568 | * @addr: target address |
| 569 | * @die_mem: a buffer for result DIE |
| 570 | * |
| 571 | * Search an inlined function DIE which includes @addr. Stores the |
| 572 | * DIE to @die_mem and returns it if found. Returns NULL if failed. |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 573 | * If several inlined functions are expanded recursively, this trace |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 574 | * it down and returns deepest one. |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 575 | */ |
| 576 | Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, |
| 577 | Dwarf_Die *die_mem) |
| 578 | { |
| 579 | Dwarf_Die tmp_die; |
| 580 | |
| 581 | sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die); |
| 582 | if (!sp_die) |
| 583 | return NULL; |
| 584 | |
| 585 | /* Inlined function could be recursive. Trace it until fail */ |
| 586 | while (sp_die) { |
| 587 | memcpy(die_mem, sp_die, sizeof(Dwarf_Die)); |
| 588 | sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, |
| 589 | &tmp_die); |
| 590 | } |
| 591 | |
| 592 | return die_mem; |
| 593 | } |
| 594 | |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 595 | struct __instance_walk_param { |
| 596 | void *addr; |
| 597 | int (*callback)(Dwarf_Die *, void *); |
| 598 | void *data; |
| 599 | int retval; |
| 600 | }; |
| 601 | |
| 602 | static int __die_walk_instances_cb(Dwarf_Die *inst, void *data) |
| 603 | { |
| 604 | struct __instance_walk_param *iwp = data; |
| 605 | Dwarf_Attribute attr_mem; |
| 606 | Dwarf_Die origin_mem; |
| 607 | Dwarf_Attribute *attr; |
| 608 | Dwarf_Die *origin; |
Masami Hiramatsu | 3f4460a | 2011-08-11 20:03:18 +0900 | [diff] [blame] | 609 | int tmp; |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 610 | |
| 611 | attr = dwarf_attr(inst, DW_AT_abstract_origin, &attr_mem); |
| 612 | if (attr == NULL) |
| 613 | return DIE_FIND_CB_CONTINUE; |
| 614 | |
| 615 | origin = dwarf_formref_die(attr, &origin_mem); |
| 616 | if (origin == NULL || origin->addr != iwp->addr) |
| 617 | return DIE_FIND_CB_CONTINUE; |
| 618 | |
Masami Hiramatsu | 3f4460a | 2011-08-11 20:03:18 +0900 | [diff] [blame] | 619 | /* Ignore redundant instances */ |
| 620 | if (dwarf_tag(inst) == DW_TAG_inlined_subroutine) { |
| 621 | dwarf_decl_line(origin, &tmp); |
| 622 | if (die_get_call_lineno(inst) == tmp) { |
| 623 | tmp = die_get_decl_fileno(origin); |
| 624 | if (die_get_call_fileno(inst) == tmp) |
| 625 | return DIE_FIND_CB_CONTINUE; |
| 626 | } |
| 627 | } |
| 628 | |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 629 | iwp->retval = iwp->callback(inst, iwp->data); |
| 630 | |
| 631 | return (iwp->retval) ? DIE_FIND_CB_END : DIE_FIND_CB_CONTINUE; |
| 632 | } |
| 633 | |
| 634 | /** |
| 635 | * die_walk_instances - Walk on instances of given DIE |
| 636 | * @or_die: an abstract original DIE |
| 637 | * @callback: a callback function which is called with instance DIE |
| 638 | * @data: user data |
| 639 | * |
| 640 | * Walk on the instances of give @in_die. @in_die must be an inlined function |
| 641 | * declartion. This returns the return value of @callback if it returns |
| 642 | * non-zero value, or -ENOENT if there is no instance. |
| 643 | */ |
| 644 | int die_walk_instances(Dwarf_Die *or_die, int (*callback)(Dwarf_Die *, void *), |
| 645 | void *data) |
| 646 | { |
| 647 | Dwarf_Die cu_die; |
| 648 | Dwarf_Die die_mem; |
| 649 | struct __instance_walk_param iwp = { |
| 650 | .addr = or_die->addr, |
| 651 | .callback = callback, |
| 652 | .data = data, |
| 653 | .retval = -ENOENT, |
| 654 | }; |
| 655 | |
| 656 | if (dwarf_diecu(or_die, &cu_die, NULL, NULL) == NULL) |
| 657 | return -ENOENT; |
| 658 | |
| 659 | die_find_child(&cu_die, __die_walk_instances_cb, &iwp, &die_mem); |
| 660 | |
| 661 | return iwp.retval; |
| 662 | } |
| 663 | |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 664 | /* Line walker internal parameters */ |
| 665 | struct __line_walk_param { |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 666 | bool recursive; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 667 | line_walk_callback_t callback; |
| 668 | void *data; |
| 669 | int retval; |
| 670 | }; |
| 671 | |
| 672 | static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data) |
| 673 | { |
| 674 | struct __line_walk_param *lw = data; |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 675 | Dwarf_Addr addr = 0; |
| 676 | const char *fname; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 677 | int lineno; |
| 678 | |
| 679 | if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) { |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 680 | fname = die_get_call_file(in_die); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 681 | lineno = die_get_call_lineno(in_die); |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 682 | if (fname && lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) { |
| 683 | lw->retval = lw->callback(fname, lineno, addr, lw->data); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 684 | if (lw->retval != 0) |
| 685 | return DIE_FIND_CB_END; |
| 686 | } |
| 687 | } |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 688 | if (!lw->recursive) |
| 689 | /* Don't need to search recursively */ |
| 690 | return DIE_FIND_CB_SIBLING; |
| 691 | |
| 692 | if (addr) { |
| 693 | fname = dwarf_decl_file(in_die); |
| 694 | if (fname && dwarf_decl_line(in_die, &lineno) == 0) { |
| 695 | lw->retval = lw->callback(fname, lineno, addr, lw->data); |
| 696 | if (lw->retval != 0) |
| 697 | return DIE_FIND_CB_END; |
| 698 | } |
| 699 | } |
| 700 | |
| 701 | /* Continue to search nested inlined function call-sites */ |
| 702 | return DIE_FIND_CB_CONTINUE; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | /* Walk on lines of blocks included in given DIE */ |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 706 | static int __die_walk_funclines(Dwarf_Die *sp_die, bool recursive, |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 707 | line_walk_callback_t callback, void *data) |
| 708 | { |
| 709 | struct __line_walk_param lw = { |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 710 | .recursive = recursive, |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 711 | .callback = callback, |
| 712 | .data = data, |
| 713 | .retval = 0, |
| 714 | }; |
| 715 | Dwarf_Die die_mem; |
| 716 | Dwarf_Addr addr; |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 717 | const char *fname; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 718 | int lineno; |
| 719 | |
| 720 | /* Handle function declaration line */ |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 721 | fname = dwarf_decl_file(sp_die); |
| 722 | if (fname && dwarf_decl_line(sp_die, &lineno) == 0 && |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 723 | dwarf_entrypc(sp_die, &addr) == 0) { |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 724 | lw.retval = callback(fname, lineno, addr, data); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 725 | if (lw.retval != 0) |
| 726 | goto done; |
| 727 | } |
| 728 | die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem); |
| 729 | done: |
| 730 | return lw.retval; |
| 731 | } |
| 732 | |
| 733 | static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data) |
| 734 | { |
| 735 | struct __line_walk_param *lw = data; |
| 736 | |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 737 | lw->retval = __die_walk_funclines(sp_die, true, lw->callback, lw->data); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 738 | if (lw->retval != 0) |
| 739 | return DWARF_CB_ABORT; |
| 740 | |
| 741 | return DWARF_CB_OK; |
| 742 | } |
| 743 | |
| 744 | /** |
| 745 | * die_walk_lines - Walk on lines inside given DIE |
Masami Hiramatsu | a128405 | 2011-08-11 20:02:35 +0900 | [diff] [blame] | 746 | * @rt_die: a root DIE (CU, subprogram or inlined_subroutine) |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 747 | * @callback: callback routine |
| 748 | * @data: user data |
| 749 | * |
| 750 | * Walk on all lines inside given @rt_die and call @callback on each line. |
| 751 | * If the @rt_die is a function, walk only on the lines inside the function, |
| 752 | * otherwise @rt_die must be a CU DIE. |
| 753 | * Note that this walks not only dwarf line list, but also function entries |
| 754 | * and inline call-site. |
| 755 | */ |
| 756 | int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data) |
| 757 | { |
| 758 | Dwarf_Lines *lines; |
| 759 | Dwarf_Line *line; |
| 760 | Dwarf_Addr addr; |
Masami Hiramatsu | 75186a9 | 2015-08-12 10:24:07 +0900 | [diff] [blame] | 761 | const char *fname, *decf = NULL; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 762 | int lineno, ret = 0; |
Masami Hiramatsu | 75186a9 | 2015-08-12 10:24:07 +0900 | [diff] [blame] | 763 | int decl = 0, inl; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 764 | Dwarf_Die die_mem, *cu_die; |
| 765 | size_t nlines, i; |
| 766 | |
| 767 | /* Get the CU die */ |
Masami Hiramatsu | 75186a9 | 2015-08-12 10:24:07 +0900 | [diff] [blame] | 768 | if (dwarf_tag(rt_die) != DW_TAG_compile_unit) { |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 769 | cu_die = dwarf_diecu(rt_die, &die_mem, NULL, NULL); |
Masami Hiramatsu | 75186a9 | 2015-08-12 10:24:07 +0900 | [diff] [blame] | 770 | dwarf_decl_line(rt_die, &decl); |
| 771 | decf = dwarf_decl_file(rt_die); |
| 772 | } else |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 773 | cu_die = rt_die; |
| 774 | if (!cu_die) { |
Masami Hiramatsu | a128405 | 2011-08-11 20:02:35 +0900 | [diff] [blame] | 775 | pr_debug2("Failed to get CU from given DIE.\n"); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 776 | return -EINVAL; |
| 777 | } |
| 778 | |
| 779 | /* Get lines list in the CU */ |
| 780 | if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) { |
| 781 | pr_debug2("Failed to get source lines on this CU.\n"); |
| 782 | return -ENOENT; |
| 783 | } |
| 784 | pr_debug2("Get %zd lines from this CU\n", nlines); |
| 785 | |
| 786 | /* Walk on the lines on lines list */ |
| 787 | for (i = 0; i < nlines; i++) { |
| 788 | line = dwarf_onesrcline(lines, i); |
| 789 | if (line == NULL || |
| 790 | dwarf_lineno(line, &lineno) != 0 || |
| 791 | dwarf_lineaddr(line, &addr) != 0) { |
| 792 | pr_debug2("Failed to get line info. " |
| 793 | "Possible error in debuginfo.\n"); |
| 794 | continue; |
| 795 | } |
| 796 | /* Filter lines based on address */ |
Masami Hiramatsu | 86a7602 | 2015-08-13 06:55:41 +0900 | [diff] [blame] | 797 | if (rt_die != cu_die) { |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 798 | /* |
| 799 | * Address filtering |
| 800 | * The line is included in given function, and |
| 801 | * no inline block includes it. |
| 802 | */ |
Masami Hiramatsu | 75186a9 | 2015-08-12 10:24:07 +0900 | [diff] [blame] | 803 | if (!dwarf_haspc(rt_die, addr)) |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 804 | continue; |
Masami Hiramatsu | 75186a9 | 2015-08-12 10:24:07 +0900 | [diff] [blame] | 805 | if (die_find_inlinefunc(rt_die, addr, &die_mem)) { |
| 806 | dwarf_decl_line(&die_mem, &inl); |
| 807 | if (inl != decl || |
| 808 | decf != dwarf_decl_file(&die_mem)) |
| 809 | continue; |
| 810 | } |
Masami Hiramatsu | 86a7602 | 2015-08-13 06:55:41 +0900 | [diff] [blame] | 811 | } |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 812 | /* Get source line */ |
| 813 | fname = dwarf_linesrc(line, NULL, NULL); |
| 814 | |
| 815 | ret = callback(fname, lineno, addr, data); |
| 816 | if (ret != 0) |
| 817 | return ret; |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * Dwarf lines doesn't include function declarations and inlined |
| 822 | * subroutines. We have to check functions list or given function. |
| 823 | */ |
| 824 | if (rt_die != cu_die) |
Masami Hiramatsu | b0e9cb2 | 2011-08-11 20:02:41 +0900 | [diff] [blame] | 825 | /* |
| 826 | * Don't need walk functions recursively, because nested |
| 827 | * inlined functions don't have lines of the specified DIE. |
| 828 | */ |
| 829 | ret = __die_walk_funclines(rt_die, false, callback, data); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 830 | else { |
| 831 | struct __line_walk_param param = { |
| 832 | .callback = callback, |
| 833 | .data = data, |
| 834 | .retval = 0, |
| 835 | }; |
| 836 | dwarf_getfuncs(cu_die, __die_walk_culines_cb, ¶m, 0); |
| 837 | ret = param.retval; |
| 838 | } |
| 839 | |
| 840 | return ret; |
| 841 | } |
| 842 | |
| 843 | struct __find_variable_param { |
| 844 | const char *name; |
| 845 | Dwarf_Addr addr; |
| 846 | }; |
| 847 | |
| 848 | static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) |
| 849 | { |
| 850 | struct __find_variable_param *fvp = data; |
Masami Hiramatsu | 082f96a | 2014-05-29 21:19:30 +0900 | [diff] [blame] | 851 | Dwarf_Attribute attr; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 852 | int tag; |
| 853 | |
| 854 | tag = dwarf_tag(die_mem); |
| 855 | if ((tag == DW_TAG_formal_parameter || |
| 856 | tag == DW_TAG_variable) && |
Masami Hiramatsu | 082f96a | 2014-05-29 21:19:30 +0900 | [diff] [blame] | 857 | die_compare_name(die_mem, fvp->name) && |
| 858 | /* Does the DIE have location information or external instance? */ |
| 859 | (dwarf_attr(die_mem, DW_AT_external, &attr) || |
| 860 | dwarf_attr(die_mem, DW_AT_location, &attr))) |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 861 | return DIE_FIND_CB_END; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 862 | if (dwarf_haspc(die_mem, fvp->addr)) |
| 863 | return DIE_FIND_CB_CONTINUE; |
| 864 | else |
| 865 | return DIE_FIND_CB_SIBLING; |
| 866 | } |
| 867 | |
| 868 | /** |
| 869 | * die_find_variable_at - Find a given name variable at given address |
| 870 | * @sp_die: a function DIE |
| 871 | * @name: variable name |
| 872 | * @addr: address |
| 873 | * @die_mem: a buffer for result DIE |
| 874 | * |
| 875 | * Find a variable DIE called @name at @addr in @sp_die. |
| 876 | */ |
| 877 | Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name, |
| 878 | Dwarf_Addr addr, Dwarf_Die *die_mem) |
| 879 | { |
| 880 | struct __find_variable_param fvp = { .name = name, .addr = addr}; |
| 881 | |
| 882 | return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp, |
| 883 | die_mem); |
| 884 | } |
| 885 | |
| 886 | static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) |
| 887 | { |
| 888 | const char *name = data; |
| 889 | |
Masami Hiramatsu | c727383 | 2015-04-02 16:33:12 +0900 | [diff] [blame] | 890 | if (dwarf_tag(die_mem) == DW_TAG_member) { |
| 891 | if (die_compare_name(die_mem, name)) |
| 892 | return DIE_FIND_CB_END; |
| 893 | else if (!dwarf_diename(die_mem)) { /* Unnamed structure */ |
| 894 | Dwarf_Die type_die, tmp_die; |
| 895 | if (die_get_type(die_mem, &type_die) && |
| 896 | die_find_member(&type_die, name, &tmp_die)) |
| 897 | return DIE_FIND_CB_END; |
| 898 | } |
| 899 | } |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 900 | return DIE_FIND_CB_SIBLING; |
| 901 | } |
| 902 | |
| 903 | /** |
| 904 | * die_find_member - Find a given name member in a data structure |
| 905 | * @st_die: a data structure type DIE |
| 906 | * @name: member name |
| 907 | * @die_mem: a buffer for result DIE |
| 908 | * |
| 909 | * Find a member DIE called @name in @st_die. |
| 910 | */ |
| 911 | Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name, |
| 912 | Dwarf_Die *die_mem) |
| 913 | { |
| 914 | return die_find_child(st_die, __die_find_member_cb, (void *)name, |
| 915 | die_mem); |
| 916 | } |
| 917 | |
| 918 | /** |
| 919 | * die_get_typename - Get the name of given variable DIE |
| 920 | * @vr_die: a variable DIE |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 921 | * @buf: a strbuf for result type name |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 922 | * |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 923 | * Get the name of @vr_die and stores it to @buf. Return 0 if succeeded. |
| 924 | * and Return -ENOENT if failed to find type name. |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 925 | * Note that the result will stores typedef name if possible, and stores |
| 926 | * "*(function_type)" if the type is a function pointer. |
| 927 | */ |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 928 | int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf) |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 929 | { |
| 930 | Dwarf_Die type; |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 931 | int tag, ret; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 932 | const char *tmp = ""; |
| 933 | |
| 934 | if (__die_get_real_type(vr_die, &type) == NULL) |
| 935 | return -ENOENT; |
| 936 | |
| 937 | tag = dwarf_tag(&type); |
| 938 | if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type) |
| 939 | tmp = "*"; |
| 940 | else if (tag == DW_TAG_subroutine_type) { |
| 941 | /* Function pointer */ |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 942 | return strbuf_add(buf, "(function_type)", 15); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 943 | } else { |
| 944 | if (!dwarf_diename(&type)) |
| 945 | return -ENOENT; |
| 946 | if (tag == DW_TAG_union_type) |
| 947 | tmp = "union "; |
| 948 | else if (tag == DW_TAG_structure_type) |
| 949 | tmp = "struct "; |
Hyeoncheol Lee | bb2d17a | 2012-09-27 11:36:39 +0900 | [diff] [blame] | 950 | else if (tag == DW_TAG_enumeration_type) |
| 951 | tmp = "enum "; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 952 | /* Write a base name */ |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 953 | return strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type)); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 954 | } |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 955 | ret = die_get_typename(&type, buf); |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 956 | return ret ? ret : strbuf_addstr(buf, tmp); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 957 | } |
| 958 | |
| 959 | /** |
| 960 | * die_get_varname - Get the name and type of given variable DIE |
| 961 | * @vr_die: a variable DIE |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 962 | * @buf: a strbuf for type and variable name |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 963 | * |
| 964 | * Get the name and type of @vr_die and stores it in @buf as "type\tname". |
| 965 | */ |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 966 | int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf) |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 967 | { |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 968 | int ret; |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 969 | |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 970 | ret = die_get_typename(vr_die, buf); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 971 | if (ret < 0) { |
| 972 | pr_debug("Failed to get type, make it unknown.\n"); |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 973 | ret = strbuf_add(buf, " (unknown_type)", 14); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 974 | } |
He Kuang | fb9596d | 2015-05-11 09:25:02 +0000 | [diff] [blame] | 975 | |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 976 | return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die)); |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 977 | } |
| 978 | |
Arnaldo Carvalho de Melo | bd0419e | 2016-04-05 11:33:41 -0300 | [diff] [blame] | 979 | #ifdef HAVE_DWARF_GETLOCATIONS |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 980 | /** |
| 981 | * die_get_var_innermost_scope - Get innermost scope range of given variable DIE |
| 982 | * @sp_die: a subprogram DIE |
| 983 | * @vr_die: a variable DIE |
| 984 | * @buf: a strbuf for variable byte offset range |
| 985 | * |
| 986 | * Get the innermost scope range of @vr_die and stores it in @buf as |
| 987 | * "@<function_name+[NN-NN,NN-NN]>". |
| 988 | */ |
| 989 | static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die, |
| 990 | struct strbuf *buf) |
| 991 | { |
| 992 | Dwarf_Die *scopes; |
| 993 | int count; |
| 994 | size_t offset = 0; |
| 995 | Dwarf_Addr base; |
| 996 | Dwarf_Addr start, end; |
| 997 | Dwarf_Addr entry; |
| 998 | int ret; |
| 999 | bool first = true; |
| 1000 | const char *name; |
| 1001 | |
| 1002 | ret = dwarf_entrypc(sp_die, &entry); |
| 1003 | if (ret) |
| 1004 | return ret; |
| 1005 | |
| 1006 | name = dwarf_diename(sp_die); |
| 1007 | if (!name) |
| 1008 | return -ENOENT; |
| 1009 | |
| 1010 | count = dwarf_getscopes_die(vr_die, &scopes); |
| 1011 | |
| 1012 | /* (*SCOPES)[1] is the DIE for the scope containing that scope */ |
| 1013 | if (count <= 1) { |
| 1014 | ret = -EINVAL; |
| 1015 | goto out; |
| 1016 | } |
| 1017 | |
| 1018 | while ((offset = dwarf_ranges(&scopes[1], offset, &base, |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1019 | &start, &end)) > 0) { |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1020 | start -= entry; |
| 1021 | end -= entry; |
| 1022 | |
| 1023 | if (first) { |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1024 | ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64, |
| 1025 | name, start, end); |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1026 | first = false; |
| 1027 | } else { |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1028 | ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64, |
| 1029 | start, end); |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1030 | } |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1031 | if (ret < 0) |
| 1032 | goto out; |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1033 | } |
| 1034 | |
| 1035 | if (!first) |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1036 | ret = strbuf_add(buf, "]>", 2); |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1037 | |
| 1038 | out: |
| 1039 | free(scopes); |
| 1040 | return ret; |
| 1041 | } |
| 1042 | |
| 1043 | /** |
| 1044 | * die_get_var_range - Get byte offset range of given variable DIE |
| 1045 | * @sp_die: a subprogram DIE |
| 1046 | * @vr_die: a variable DIE |
| 1047 | * @buf: a strbuf for type and variable name and byte offset range |
| 1048 | * |
| 1049 | * Get the byte offset range of @vr_die and stores it in @buf as |
| 1050 | * "@<function_name+[NN-NN,NN-NN]>". |
| 1051 | */ |
| 1052 | int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf) |
| 1053 | { |
| 1054 | int ret = 0; |
| 1055 | Dwarf_Addr base; |
| 1056 | Dwarf_Addr start, end; |
| 1057 | Dwarf_Addr entry; |
| 1058 | Dwarf_Op *op; |
| 1059 | size_t nops; |
| 1060 | size_t offset = 0; |
| 1061 | Dwarf_Attribute attr; |
| 1062 | bool first = true; |
| 1063 | const char *name; |
| 1064 | |
| 1065 | ret = dwarf_entrypc(sp_die, &entry); |
| 1066 | if (ret) |
| 1067 | return ret; |
| 1068 | |
| 1069 | name = dwarf_diename(sp_die); |
| 1070 | if (!name) |
| 1071 | return -ENOENT; |
| 1072 | |
| 1073 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL) |
| 1074 | return -EINVAL; |
| 1075 | |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1076 | while ((offset = dwarf_getlocations(&attr, offset, &base, |
| 1077 | &start, &end, &op, &nops)) > 0) { |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1078 | if (start == 0) { |
| 1079 | /* Single Location Descriptions */ |
| 1080 | ret = die_get_var_innermost_scope(sp_die, vr_die, buf); |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1081 | goto out; |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1082 | } |
| 1083 | |
| 1084 | /* Location Lists */ |
| 1085 | start -= entry; |
| 1086 | end -= entry; |
| 1087 | if (first) { |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1088 | ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64, |
| 1089 | name, start, end); |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1090 | first = false; |
| 1091 | } else { |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1092 | ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64, |
| 1093 | start, end); |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1094 | } |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1095 | if (ret < 0) |
| 1096 | goto out; |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1097 | } |
| 1098 | |
| 1099 | if (!first) |
Masami Hiramatsu | bf4d5f2 | 2016-05-10 14:47:07 +0900 | [diff] [blame] | 1100 | ret = strbuf_add(buf, "]>", 2); |
| 1101 | out: |
He Kuang | 349e8d2 | 2015-05-11 09:25:03 +0000 | [diff] [blame] | 1102 | return ret; |
| 1103 | } |
Arnaldo Carvalho de Melo | bd0419e | 2016-04-05 11:33:41 -0300 | [diff] [blame] | 1104 | #else |
| 1105 | int die_get_var_range(Dwarf_Die *sp_die __maybe_unused, |
| 1106 | Dwarf_Die *vr_die __maybe_unused, |
| 1107 | struct strbuf *buf __maybe_unused) |
| 1108 | { |
| 1109 | return -ENOTSUP; |
| 1110 | } |
| 1111 | #endif |
Ravi Bangoria | 6243b9d | 2016-08-30 14:09:37 +0530 | [diff] [blame] | 1112 | |
| 1113 | /* |
| 1114 | * die_has_loclist - Check if DW_AT_location of @vr_die is a location list |
| 1115 | * @vr_die: a variable DIE |
| 1116 | */ |
| 1117 | static bool die_has_loclist(Dwarf_Die *vr_die) |
| 1118 | { |
| 1119 | Dwarf_Attribute loc; |
| 1120 | int tag = dwarf_tag(vr_die); |
| 1121 | |
| 1122 | if (tag != DW_TAG_formal_parameter && |
| 1123 | tag != DW_TAG_variable) |
| 1124 | return false; |
| 1125 | |
| 1126 | return (dwarf_attr_integrate(vr_die, DW_AT_location, &loc) && |
| 1127 | dwarf_whatform(&loc) == DW_FORM_sec_offset); |
| 1128 | } |
| 1129 | |
| 1130 | /* |
| 1131 | * die_is_optimized_target - Check if target program is compiled with |
| 1132 | * optimization |
| 1133 | * @cu_die: a CU DIE |
| 1134 | * |
| 1135 | * For any object in given CU whose DW_AT_location is a location list, |
| 1136 | * target program is compiled with optimization. This is applicable to |
| 1137 | * clang as well. |
| 1138 | */ |
| 1139 | bool die_is_optimized_target(Dwarf_Die *cu_die) |
| 1140 | { |
| 1141 | Dwarf_Die tmp_die; |
| 1142 | |
| 1143 | if (die_has_loclist(cu_die)) |
| 1144 | return true; |
| 1145 | |
| 1146 | if (!dwarf_child(cu_die, &tmp_die) && |
| 1147 | die_is_optimized_target(&tmp_die)) |
| 1148 | return true; |
| 1149 | |
| 1150 | if (!dwarf_siblingof(cu_die, &tmp_die) && |
| 1151 | die_is_optimized_target(&tmp_die)) |
| 1152 | return true; |
| 1153 | |
| 1154 | return false; |
| 1155 | } |
| 1156 | |
| 1157 | /* |
| 1158 | * die_search_idx - Search index of given line address |
| 1159 | * @lines: Line records of single CU |
| 1160 | * @nr_lines: Number of @lines |
| 1161 | * @addr: address we are looking for |
| 1162 | * @idx: index to be set by this function (return value) |
| 1163 | * |
| 1164 | * Search for @addr by looping over every lines of CU. If address |
| 1165 | * matches, set index of that line in @idx. Note that single source |
| 1166 | * line can have multiple line records. i.e. single source line can |
| 1167 | * have multiple index. |
| 1168 | */ |
| 1169 | static bool die_search_idx(Dwarf_Lines *lines, unsigned long nr_lines, |
| 1170 | Dwarf_Addr addr, unsigned long *idx) |
| 1171 | { |
| 1172 | unsigned long i; |
| 1173 | Dwarf_Addr tmp; |
| 1174 | |
| 1175 | for (i = 0; i < nr_lines; i++) { |
| 1176 | if (dwarf_lineaddr(dwarf_onesrcline(lines, i), &tmp)) |
| 1177 | return false; |
| 1178 | |
| 1179 | if (tmp == addr) { |
| 1180 | *idx = i; |
| 1181 | return true; |
| 1182 | } |
| 1183 | } |
| 1184 | return false; |
| 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * die_get_postprologue_addr - Search next address after function prologue |
| 1189 | * @entrypc_idx: entrypc index |
| 1190 | * @lines: Line records of single CU |
| 1191 | * @nr_lines: Number of @lines |
| 1192 | * @hignpc: high PC address of function |
| 1193 | * @postprologue_addr: Next address after function prologue (return value) |
| 1194 | * |
| 1195 | * Look for prologue-end marker. If there is no explicit marker, return |
| 1196 | * address of next line record or next source line. |
| 1197 | */ |
| 1198 | static bool die_get_postprologue_addr(unsigned long entrypc_idx, |
| 1199 | Dwarf_Lines *lines, |
| 1200 | unsigned long nr_lines, |
| 1201 | Dwarf_Addr highpc, |
| 1202 | Dwarf_Addr *postprologue_addr) |
| 1203 | { |
| 1204 | unsigned long i; |
| 1205 | int entrypc_lno, lno; |
| 1206 | Dwarf_Line *line; |
| 1207 | Dwarf_Addr addr; |
| 1208 | bool p_end; |
| 1209 | |
| 1210 | /* entrypc_lno is actual source line number */ |
| 1211 | line = dwarf_onesrcline(lines, entrypc_idx); |
| 1212 | if (dwarf_lineno(line, &entrypc_lno)) |
| 1213 | return false; |
| 1214 | |
| 1215 | for (i = entrypc_idx; i < nr_lines; i++) { |
| 1216 | line = dwarf_onesrcline(lines, i); |
| 1217 | |
| 1218 | if (dwarf_lineaddr(line, &addr) || |
| 1219 | dwarf_lineno(line, &lno) || |
| 1220 | dwarf_lineprologueend(line, &p_end)) |
| 1221 | return false; |
| 1222 | |
| 1223 | /* highpc is exclusive. [entrypc,highpc) */ |
| 1224 | if (addr >= highpc) |
| 1225 | break; |
| 1226 | |
| 1227 | /* clang supports prologue-end marker */ |
| 1228 | if (p_end) |
| 1229 | break; |
| 1230 | |
| 1231 | /* Actual next line in source */ |
| 1232 | if (lno != entrypc_lno) |
| 1233 | break; |
| 1234 | |
| 1235 | /* |
| 1236 | * Single source line can have multiple line records. |
| 1237 | * For Example, |
| 1238 | * void foo() { printf("hello\n"); } |
| 1239 | * contains two line records. One points to declaration and |
| 1240 | * other points to printf() line. Variable 'lno' won't get |
| 1241 | * incremented in this case but 'i' will. |
| 1242 | */ |
| 1243 | if (i != entrypc_idx) |
| 1244 | break; |
| 1245 | } |
| 1246 | |
| 1247 | dwarf_lineaddr(line, postprologue_addr); |
| 1248 | if (*postprologue_addr >= highpc) |
| 1249 | dwarf_lineaddr(dwarf_onesrcline(lines, i - 1), |
| 1250 | postprologue_addr); |
| 1251 | |
| 1252 | return true; |
| 1253 | } |
| 1254 | |
| 1255 | /* |
| 1256 | * die_skip_prologue - Use next address after prologue as probe location |
| 1257 | * @sp_die: a subprogram DIE |
| 1258 | * @cu_die: a CU DIE |
| 1259 | * @entrypc: entrypc of the function |
| 1260 | * |
| 1261 | * Function prologue prepares stack and registers before executing function |
| 1262 | * logic. When target program is compiled without optimization, function |
| 1263 | * parameter information is only valid after prologue. When we probe entrypc |
| 1264 | * of the function, and try to record function parameter, it contains |
| 1265 | * garbage value. |
| 1266 | */ |
| 1267 | void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die, |
| 1268 | Dwarf_Addr *entrypc) |
| 1269 | { |
| 1270 | size_t nr_lines = 0; |
| 1271 | unsigned long entrypc_idx = 0; |
| 1272 | Dwarf_Lines *lines = NULL; |
| 1273 | Dwarf_Addr postprologue_addr; |
| 1274 | Dwarf_Addr highpc; |
| 1275 | |
| 1276 | if (dwarf_highpc(sp_die, &highpc)) |
| 1277 | return; |
| 1278 | |
| 1279 | if (dwarf_getsrclines(cu_die, &lines, &nr_lines)) |
| 1280 | return; |
| 1281 | |
| 1282 | if (!die_search_idx(lines, nr_lines, *entrypc, &entrypc_idx)) |
| 1283 | return; |
| 1284 | |
| 1285 | if (!die_get_postprologue_addr(entrypc_idx, lines, nr_lines, |
| 1286 | highpc, &postprologue_addr)) |
| 1287 | return; |
| 1288 | |
| 1289 | *entrypc = postprologue_addr; |
| 1290 | } |