]>
Commit | Line | Data |
---|---|---|
4ea42b18 MH |
1 | /* |
2 | * probe-finder.c : C expression to kprobe event converter | |
3 | * | |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <sys/utsname.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <errno.h> | |
27 | #include <stdio.h> | |
28 | #include <unistd.h> | |
29 | #include <getopt.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | #include <stdarg.h> | |
cd932c59 | 33 | #include <dwarf-regs.h> |
074fc0e4 | 34 | |
124bb83c | 35 | #include <linux/bitops.h> |
89c69c0e MH |
36 | #include "event.h" |
37 | #include "debug.h" | |
074fc0e4 | 38 | #include "util.h" |
9ed7e1b8 | 39 | #include "symbol.h" |
4ea42b18 MH |
40 | #include "probe-finder.h" |
41 | ||
4984912e MH |
42 | /* Kprobe tracer basic type is up to u64 */ |
43 | #define MAX_BASIC_TYPE_BITS 64 | |
44 | ||
2a9c8c36 MH |
45 | /* Line number list operations */ |
46 | ||
47 | /* Add a line to line number list */ | |
d3b63d7a | 48 | static int line_list__add_line(struct list_head *head, int line) |
2a9c8c36 MH |
49 | { |
50 | struct line_node *ln; | |
51 | struct list_head *p; | |
52 | ||
53 | /* Reverse search, because new line will be the last one */ | |
54 | list_for_each_entry_reverse(ln, head, list) { | |
55 | if (ln->line < line) { | |
56 | p = &ln->list; | |
57 | goto found; | |
58 | } else if (ln->line == line) /* Already exist */ | |
e334016f | 59 | return 1; |
2a9c8c36 MH |
60 | } |
61 | /* List is empty, or the smallest entry */ | |
62 | p = head; | |
63 | found: | |
64 | pr_debug("line list: add a line %u\n", line); | |
e334016f MH |
65 | ln = zalloc(sizeof(struct line_node)); |
66 | if (ln == NULL) | |
67 | return -ENOMEM; | |
2a9c8c36 MH |
68 | ln->line = line; |
69 | INIT_LIST_HEAD(&ln->list); | |
70 | list_add(&ln->list, p); | |
e334016f | 71 | return 0; |
2a9c8c36 MH |
72 | } |
73 | ||
74 | /* Check if the line in line number list */ | |
d3b63d7a | 75 | static int line_list__has_line(struct list_head *head, int line) |
2a9c8c36 MH |
76 | { |
77 | struct line_node *ln; | |
78 | ||
79 | /* Reverse search, because new line will be the last one */ | |
80 | list_for_each_entry(ln, head, list) | |
81 | if (ln->line == line) | |
82 | return 1; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | /* Init line number list */ | |
88 | static void line_list__init(struct list_head *head) | |
89 | { | |
90 | INIT_LIST_HEAD(head); | |
91 | } | |
92 | ||
93 | /* Free line number list */ | |
94 | static void line_list__free(struct list_head *head) | |
95 | { | |
96 | struct line_node *ln; | |
97 | while (!list_empty(head)) { | |
98 | ln = list_first_entry(head, struct line_node, list); | |
99 | list_del(&ln->list); | |
100 | free(ln); | |
101 | } | |
102 | } | |
103 | ||
469b9b88 | 104 | /* Dwarf FL wrappers */ |
469b9b88 MH |
105 | static char *debuginfo_path; /* Currently dummy */ |
106 | ||
107 | static const Dwfl_Callbacks offline_callbacks = { | |
108 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
109 | .debuginfo_path = &debuginfo_path, | |
110 | ||
111 | .section_address = dwfl_offline_section_address, | |
112 | ||
113 | /* We use this table for core files too. */ | |
114 | .find_elf = dwfl_build_id_find_elf, | |
115 | }; | |
116 | ||
469b9b88 | 117 | /* Get a Dwarf from offline image */ |
ff741783 MH |
118 | static int debuginfo__init_offline_dwarf(struct debuginfo *self, |
119 | const char *path) | |
469b9b88 | 120 | { |
ff741783 | 121 | int fd; |
469b9b88 | 122 | |
ff741783 MH |
123 | fd = open(path, O_RDONLY); |
124 | if (fd < 0) | |
125 | return fd; | |
469b9b88 | 126 | |
ff741783 MH |
127 | self->dwfl = dwfl_begin(&offline_callbacks); |
128 | if (!self->dwfl) | |
129 | goto error; | |
469b9b88 | 130 | |
576b5237 MH |
131 | self->mod = dwfl_report_offline(self->dwfl, "", "", fd); |
132 | if (!self->mod) | |
469b9b88 MH |
133 | goto error; |
134 | ||
576b5237 | 135 | self->dbg = dwfl_module_getdwarf(self->mod, &self->bias); |
ff741783 MH |
136 | if (!self->dbg) |
137 | goto error; | |
138 | ||
139 | return 0; | |
469b9b88 | 140 | error: |
ff741783 MH |
141 | if (self->dwfl) |
142 | dwfl_end(self->dwfl); | |
143 | else | |
144 | close(fd); | |
145 | memset(self, 0, sizeof(*self)); | |
146 | ||
147 | return -ENOENT; | |
469b9b88 MH |
148 | } |
149 | ||
3b4694de MH |
150 | #if _ELFUTILS_PREREQ(0, 148) |
151 | /* This method is buggy if elfutils is older than 0.148 */ | |
152 | static int __linux_kernel_find_elf(Dwfl_Module *mod, | |
153 | void **userdata, | |
154 | const char *module_name, | |
155 | Dwarf_Addr base, | |
156 | char **file_name, Elf **elfp) | |
157 | { | |
158 | int fd; | |
159 | const char *path = kernel_get_module_path(module_name); | |
160 | ||
161 | pr_debug2("Use file %s for %s\n", path, module_name); | |
162 | if (path) { | |
163 | fd = open(path, O_RDONLY); | |
164 | if (fd >= 0) { | |
165 | *file_name = strdup(path); | |
166 | return fd; | |
167 | } | |
168 | } | |
169 | /* If failed, try to call standard method */ | |
170 | return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base, | |
171 | file_name, elfp); | |
172 | } | |
173 | ||
174 | static const Dwfl_Callbacks kernel_callbacks = { | |
175 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
176 | .debuginfo_path = &debuginfo_path, | |
177 | ||
178 | .find_elf = __linux_kernel_find_elf, | |
179 | .section_address = dwfl_linux_kernel_module_section_address, | |
180 | }; | |
181 | ||
469b9b88 | 182 | /* Get a Dwarf from live kernel image */ |
ff741783 MH |
183 | static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self, |
184 | Dwarf_Addr addr) | |
469b9b88 | 185 | { |
ff741783 MH |
186 | self->dwfl = dwfl_begin(&kernel_callbacks); |
187 | if (!self->dwfl) | |
188 | return -EINVAL; | |
469b9b88 MH |
189 | |
190 | /* Load the kernel dwarves: Don't care the result here */ | |
ff741783 MH |
191 | dwfl_linux_kernel_report_kernel(self->dwfl); |
192 | dwfl_linux_kernel_report_modules(self->dwfl); | |
469b9b88 | 193 | |
ff741783 | 194 | self->dbg = dwfl_addrdwarf(self->dwfl, addr, &self->bias); |
469b9b88 | 195 | /* Here, check whether we could get a real dwarf */ |
ff741783 | 196 | if (!self->dbg) { |
3b4694de MH |
197 | pr_debug("Failed to find kernel dwarf at %lx\n", |
198 | (unsigned long)addr); | |
ff741783 MH |
199 | dwfl_end(self->dwfl); |
200 | memset(self, 0, sizeof(*self)); | |
201 | return -ENOENT; | |
469b9b88 | 202 | } |
ff741783 MH |
203 | |
204 | return 0; | |
469b9b88 | 205 | } |
3b4694de MH |
206 | #else |
207 | /* With older elfutils, this just support kernel module... */ | |
ff741783 | 208 | static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self, |
1d037ca1 | 209 | Dwarf_Addr addr __maybe_unused) |
3b4694de | 210 | { |
3b4694de MH |
211 | const char *path = kernel_get_module_path("kernel"); |
212 | ||
213 | if (!path) { | |
214 | pr_err("Failed to find vmlinux path\n"); | |
ff741783 | 215 | return -ENOENT; |
3b4694de MH |
216 | } |
217 | ||
218 | pr_debug2("Use file %s for debuginfo\n", path); | |
ff741783 MH |
219 | return debuginfo__init_offline_dwarf(self, path); |
220 | } | |
221 | #endif | |
222 | ||
223 | struct debuginfo *debuginfo__new(const char *path) | |
224 | { | |
225 | struct debuginfo *self = zalloc(sizeof(struct debuginfo)); | |
226 | if (!self) | |
3b4694de MH |
227 | return NULL; |
228 | ||
ff741783 MH |
229 | if (debuginfo__init_offline_dwarf(self, path) < 0) { |
230 | free(self); | |
231 | self = NULL; | |
232 | } | |
233 | ||
234 | return self; | |
235 | } | |
236 | ||
237 | struct debuginfo *debuginfo__new_online_kernel(unsigned long addr) | |
238 | { | |
239 | struct debuginfo *self = zalloc(sizeof(struct debuginfo)); | |
240 | if (!self) | |
241 | return NULL; | |
242 | ||
243 | if (debuginfo__init_online_kernel_dwarf(self, (Dwarf_Addr)addr) < 0) { | |
244 | free(self); | |
245 | self = NULL; | |
246 | } | |
247 | ||
248 | return self; | |
249 | } | |
250 | ||
251 | void debuginfo__delete(struct debuginfo *self) | |
252 | { | |
253 | if (self) { | |
254 | if (self->dwfl) | |
255 | dwfl_end(self->dwfl); | |
256 | free(self); | |
257 | } | |
3b4694de | 258 | } |
469b9b88 | 259 | |
4ea42b18 MH |
260 | /* |
261 | * Probe finder related functions | |
262 | */ | |
263 | ||
0e60836b | 264 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 265 | { |
0e60836b SD |
266 | struct probe_trace_arg_ref *ref; |
267 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
268 | if (ref != NULL) |
269 | ref->offset = offs; | |
270 | return ref; | |
271 | } | |
272 | ||
cf6eb489 MH |
273 | /* |
274 | * Convert a location into trace_arg. | |
275 | * If tvar == NULL, this just checks variable can be converted. | |
276 | */ | |
277 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
278 | Dwarf_Op *fb_ops, | |
279 | struct probe_trace_arg *tvar) | |
4ea42b18 | 280 | { |
b7dcb857 MH |
281 | Dwarf_Attribute attr; |
282 | Dwarf_Op *op; | |
283 | size_t nops; | |
804b3606 MH |
284 | unsigned int regn; |
285 | Dwarf_Word offs = 0; | |
4235b045 | 286 | bool ref = false; |
4ea42b18 | 287 | const char *regs; |
b7dcb857 MH |
288 | int ret; |
289 | ||
632941c4 MH |
290 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
291 | goto static_var; | |
292 | ||
b7dcb857 MH |
293 | /* TODO: handle more than 1 exprs */ |
294 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
cf6eb489 | 295 | dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 || |
b7dcb857 MH |
296 | nops == 0) { |
297 | /* TODO: Support const_value */ | |
b7dcb857 MH |
298 | return -ENOENT; |
299 | } | |
300 | ||
301 | if (op->atom == DW_OP_addr) { | |
632941c4 | 302 | static_var: |
cf6eb489 MH |
303 | if (!tvar) |
304 | return 0; | |
b7dcb857 MH |
305 | /* Static variables on memory (not stack), make @varname */ |
306 | ret = strlen(dwarf_diename(vr_die)); | |
307 | tvar->value = zalloc(ret + 2); | |
308 | if (tvar->value == NULL) | |
309 | return -ENOMEM; | |
310 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
311 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
312 | if (tvar->ref == NULL) | |
313 | return -ENOMEM; | |
314 | return 0; | |
315 | } | |
4ea42b18 | 316 | |
4ea42b18 | 317 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 318 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 319 | if (fb_ops == NULL) |
b55a87ad | 320 | return -ENOTSUP; |
4235b045 | 321 | ref = true; |
804b3606 | 322 | offs = op->number; |
cf6eb489 | 323 | op = &fb_ops[0]; |
804b3606 | 324 | } |
4ea42b18 | 325 | |
804b3606 MH |
326 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
327 | regn = op->atom - DW_OP_breg0; | |
328 | offs += op->number; | |
4235b045 | 329 | ref = true; |
804b3606 MH |
330 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
331 | regn = op->atom - DW_OP_reg0; | |
332 | } else if (op->atom == DW_OP_bregx) { | |
333 | regn = op->number; | |
334 | offs += op->number2; | |
4235b045 | 335 | ref = true; |
804b3606 MH |
336 | } else if (op->atom == DW_OP_regx) { |
337 | regn = op->number; | |
b55a87ad | 338 | } else { |
cf6eb489 | 339 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
340 | return -ENOTSUP; |
341 | } | |
4ea42b18 | 342 | |
cf6eb489 MH |
343 | if (!tvar) |
344 | return 0; | |
345 | ||
4ea42b18 | 346 | regs = get_arch_regstr(regn); |
b55a87ad | 347 | if (!regs) { |
cf6eb489 | 348 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
349 | pr_warning("Mapping for the register number %u " |
350 | "missing on this architecture.\n", regn); | |
b55a87ad MH |
351 | return -ERANGE; |
352 | } | |
4ea42b18 | 353 | |
02b95dad MH |
354 | tvar->value = strdup(regs); |
355 | if (tvar->value == NULL) | |
356 | return -ENOMEM; | |
357 | ||
4235b045 | 358 | if (ref) { |
b7dcb857 | 359 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
360 | if (tvar->ref == NULL) |
361 | return -ENOMEM; | |
4235b045 | 362 | } |
b55a87ad | 363 | return 0; |
4ea42b18 MH |
364 | } |
365 | ||
124bb83c MH |
366 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
367 | ||
b55a87ad | 368 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 369 | struct probe_trace_arg *tvar, |
73317b95 | 370 | const char *cast) |
4984912e | 371 | { |
0e60836b | 372 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
373 | Dwarf_Die type; |
374 | char buf[16]; | |
bcfc0821 | 375 | int bsize, boffs, total; |
4984912e MH |
376 | int ret; |
377 | ||
73317b95 MH |
378 | /* TODO: check all types */ |
379 | if (cast && strcmp(cast, "string") != 0) { | |
380 | /* Non string type is OK */ | |
381 | tvar->type = strdup(cast); | |
382 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
383 | } | |
384 | ||
bcfc0821 MH |
385 | bsize = dwarf_bitsize(vr_die); |
386 | if (bsize > 0) { | |
124bb83c | 387 | /* This is a bitfield */ |
bcfc0821 MH |
388 | boffs = dwarf_bitoffset(vr_die); |
389 | total = dwarf_bytesize(vr_die); | |
390 | if (boffs < 0 || total < 0) | |
391 | return -ENOENT; | |
392 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
393 | BYTES_TO_BITS(total)); | |
124bb83c MH |
394 | goto formatted; |
395 | } | |
396 | ||
b55a87ad MH |
397 | if (die_get_real_type(vr_die, &type) == NULL) { |
398 | pr_warning("Failed to get a type information of %s.\n", | |
399 | dwarf_diename(vr_die)); | |
400 | return -ENOENT; | |
401 | } | |
4984912e | 402 | |
b2a3c12b MH |
403 | pr_debug("%s type is %s.\n", |
404 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
405 | ||
73317b95 MH |
406 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
407 | ret = dwarf_tag(&type); | |
408 | if (ret != DW_TAG_pointer_type && | |
409 | ret != DW_TAG_array_type) { | |
410 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 411 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
412 | dwarf_diename(vr_die), dwarf_diename(&type)); |
413 | return -EINVAL; | |
414 | } | |
7ce28b5b HL |
415 | if (die_get_real_type(&type, &type) == NULL) { |
416 | pr_warning("Failed to get a type" | |
417 | " information.\n"); | |
418 | return -ENOENT; | |
419 | } | |
73317b95 | 420 | if (ret == DW_TAG_pointer_type) { |
73317b95 MH |
421 | while (*ref_ptr) |
422 | ref_ptr = &(*ref_ptr)->next; | |
423 | /* Add new reference with offset +0 */ | |
0e60836b | 424 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
425 | if (*ref_ptr == NULL) { |
426 | pr_warning("Out of memory error\n"); | |
427 | return -ENOMEM; | |
428 | } | |
429 | } | |
82175633 MH |
430 | if (!die_compare_name(&type, "char") && |
431 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 432 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 433 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
434 | dwarf_diename(vr_die)); |
435 | return -EINVAL; | |
436 | } | |
437 | tvar->type = strdup(cast); | |
438 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
439 | } | |
440 | ||
bcfc0821 MH |
441 | ret = dwarf_bytesize(&type); |
442 | if (ret <= 0) | |
124bb83c MH |
443 | /* No size ... try to use default type */ |
444 | return 0; | |
bcfc0821 | 445 | ret = BYTES_TO_BITS(ret); |
4984912e | 446 | |
124bb83c MH |
447 | /* Check the bitwidth */ |
448 | if (ret > MAX_BASIC_TYPE_BITS) { | |
449 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
450 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
451 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 452 | } |
124bb83c MH |
453 | ret = snprintf(buf, 16, "%c%d", |
454 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
455 | ||
456 | formatted: | |
457 | if (ret < 0 || ret >= 16) { | |
458 | if (ret >= 16) | |
459 | ret = -E2BIG; | |
460 | pr_warning("Failed to convert variable type: %s\n", | |
461 | strerror(-ret)); | |
462 | return ret; | |
463 | } | |
464 | tvar->type = strdup(buf); | |
465 | if (tvar->type == NULL) | |
466 | return -ENOMEM; | |
b55a87ad | 467 | return 0; |
4984912e MH |
468 | } |
469 | ||
b55a87ad | 470 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 471 | struct perf_probe_arg_field *field, |
0e60836b | 472 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 473 | Dwarf_Die *die_mem) |
7df2f329 | 474 | { |
0e60836b | 475 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
476 | Dwarf_Die type; |
477 | Dwarf_Word offs; | |
b2a3c12b | 478 | int ret, tag; |
7df2f329 MH |
479 | |
480 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
481 | if (die_get_real_type(vr_die, &type) == NULL) { |
482 | pr_warning("Failed to get the type of %s.\n", varname); | |
483 | return -ENOENT; | |
484 | } | |
b2a3c12b MH |
485 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
486 | tag = dwarf_tag(&type); | |
487 | ||
488 | if (field->name[0] == '[' && | |
489 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
490 | if (field->next) | |
491 | /* Save original type for next field */ | |
492 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
493 | /* Get the type of this array */ | |
494 | if (die_get_real_type(&type, &type) == NULL) { | |
495 | pr_warning("Failed to get the type of %s.\n", varname); | |
496 | return -ENOENT; | |
497 | } | |
498 | pr_debug2("Array real type: (%x)\n", | |
499 | (unsigned)dwarf_dieoffset(&type)); | |
500 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 501 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
502 | if (ref == NULL) |
503 | return -ENOMEM; | |
504 | if (*ref_ptr) | |
505 | (*ref_ptr)->next = ref; | |
506 | else | |
507 | *ref_ptr = ref; | |
508 | } | |
bcfc0821 | 509 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
510 | if (!field->next) |
511 | /* Save vr_die for converting types */ | |
512 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
513 | goto next; | |
514 | } else if (tag == DW_TAG_pointer_type) { | |
515 | /* Check the pointer and dereference */ | |
b55a87ad MH |
516 | if (!field->ref) { |
517 | pr_err("Semantic error: %s must be referred by '->'\n", | |
518 | field->name); | |
519 | return -EINVAL; | |
520 | } | |
7df2f329 | 521 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
522 | if (die_get_real_type(&type, &type) == NULL) { |
523 | pr_warning("Failed to get the type of %s.\n", varname); | |
524 | return -ENOENT; | |
525 | } | |
12e5a7ae | 526 | /* Verify it is a data structure */ |
7b0295b3 HL |
527 | tag = dwarf_tag(&type); |
528 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { | |
529 | pr_warning("%s is not a data structure nor an union.\n", | |
530 | varname); | |
b55a87ad MH |
531 | return -EINVAL; |
532 | } | |
12e5a7ae | 533 | |
0e60836b | 534 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
535 | if (ref == NULL) |
536 | return -ENOMEM; | |
7df2f329 MH |
537 | if (*ref_ptr) |
538 | (*ref_ptr)->next = ref; | |
539 | else | |
540 | *ref_ptr = ref; | |
541 | } else { | |
12e5a7ae | 542 | /* Verify it is a data structure */ |
7b0295b3 HL |
543 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
544 | pr_warning("%s is not a data structure nor an union.\n", | |
545 | varname); | |
b55a87ad MH |
546 | return -EINVAL; |
547 | } | |
b2a3c12b | 548 | if (field->name[0] == '[') { |
0e43e5d2 MH |
549 | pr_err("Semantic error: %s is not a pointor" |
550 | " nor array.\n", varname); | |
b2a3c12b MH |
551 | return -EINVAL; |
552 | } | |
b55a87ad MH |
553 | if (field->ref) { |
554 | pr_err("Semantic error: %s must be referred by '.'\n", | |
555 | field->name); | |
556 | return -EINVAL; | |
557 | } | |
558 | if (!ref) { | |
559 | pr_warning("Structure on a register is not " | |
560 | "supported yet.\n"); | |
561 | return -ENOTSUP; | |
562 | } | |
7df2f329 MH |
563 | } |
564 | ||
b55a87ad MH |
565 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
566 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
567 | dwarf_diename(&type), field->name); | |
568 | return -EINVAL; | |
569 | } | |
7df2f329 MH |
570 | |
571 | /* Get the offset of the field */ | |
7b0295b3 HL |
572 | if (tag == DW_TAG_union_type) { |
573 | offs = 0; | |
574 | } else { | |
575 | ret = die_get_data_member_location(die_mem, &offs); | |
576 | if (ret < 0) { | |
577 | pr_warning("Failed to get the offset of %s.\n", | |
578 | field->name); | |
579 | return ret; | |
580 | } | |
b55a87ad | 581 | } |
7df2f329 MH |
582 | ref->offset += (long)offs; |
583 | ||
b2a3c12b | 584 | next: |
7df2f329 MH |
585 | /* Converting next field */ |
586 | if (field->next) | |
b55a87ad | 587 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 588 | field->next, &ref, die_mem); |
b55a87ad MH |
589 | else |
590 | return 0; | |
7df2f329 MH |
591 | } |
592 | ||
4ea42b18 | 593 | /* Show a variables in kprobe event format */ |
b55a87ad | 594 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 595 | { |
4984912e | 596 | Dwarf_Die die_mem; |
4ea42b18 MH |
597 | int ret; |
598 | ||
b7dcb857 MH |
599 | pr_debug("Converting variable %s into trace event.\n", |
600 | dwarf_diename(vr_die)); | |
804b3606 | 601 | |
cf6eb489 MH |
602 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
603 | pf->tvar); | |
604 | if (ret == -ENOENT) | |
605 | pr_err("Failed to find the location of %s at this address.\n" | |
606 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
607 | else if (ret == -ENOTSUP) | |
608 | pr_err("Sorry, we don't support this variable location yet.\n"); | |
609 | else if (pf->pvar->field) { | |
b55a87ad MH |
610 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
611 | pf->pvar->field, &pf->tvar->ref, | |
612 | &die_mem); | |
4984912e MH |
613 | vr_die = &die_mem; |
614 | } | |
73317b95 MH |
615 | if (ret == 0) |
616 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 617 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 618 | return ret; |
4ea42b18 MH |
619 | } |
620 | ||
221d0611 MH |
621 | /* Find a variable in a scope DIE */ |
622 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 623 | { |
f182e3e1 | 624 | Dwarf_Die vr_die; |
11a1ca35 | 625 | char buf[32], *ptr; |
f182e3e1 | 626 | int ret = 0; |
4ea42b18 | 627 | |
367e94c1 MH |
628 | if (!is_c_varname(pf->pvar->var)) { |
629 | /* Copy raw parameters */ | |
630 | pf->tvar->value = strdup(pf->pvar->var); | |
631 | if (pf->tvar->value == NULL) | |
632 | return -ENOMEM; | |
633 | if (pf->pvar->type) { | |
634 | pf->tvar->type = strdup(pf->pvar->type); | |
635 | if (pf->tvar->type == NULL) | |
636 | return -ENOMEM; | |
637 | } | |
638 | if (pf->pvar->name) { | |
639 | pf->tvar->name = strdup(pf->pvar->name); | |
640 | if (pf->tvar->name == NULL) | |
641 | return -ENOMEM; | |
642 | } else | |
643 | pf->tvar->name = NULL; | |
644 | return 0; | |
645 | } | |
646 | ||
48481938 | 647 | if (pf->pvar->name) |
02b95dad | 648 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 649 | else { |
02b95dad MH |
650 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
651 | if (ret < 0) | |
652 | return ret; | |
11a1ca35 MH |
653 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
654 | if (ptr) | |
655 | *ptr = '_'; | |
02b95dad | 656 | pf->tvar->name = strdup(buf); |
48481938 | 657 | } |
02b95dad MH |
658 | if (pf->tvar->name == NULL) |
659 | return -ENOMEM; | |
48481938 | 660 | |
f182e3e1 | 661 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
b55a87ad | 662 | /* Search child die for local variables and parameters. */ |
f182e3e1 MH |
663 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
664 | /* Search again in global variables */ | |
665 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die)) | |
666 | ret = -ENOENT; | |
b7dcb857 | 667 | } |
f66fedcb | 668 | if (ret >= 0) |
f182e3e1 MH |
669 | ret = convert_variable(&vr_die, pf); |
670 | ||
b7dcb857 | 671 | if (ret < 0) |
b55a87ad MH |
672 | pr_warning("Failed to find '%s' in this function.\n", |
673 | pf->pvar->var); | |
b7dcb857 | 674 | return ret; |
4ea42b18 MH |
675 | } |
676 | ||
cf6eb489 | 677 | /* Convert subprogram DIE to trace point */ |
576b5237 MH |
678 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, |
679 | Dwarf_Addr paddr, bool retprobe, | |
680 | struct probe_trace_point *tp) | |
4ea42b18 | 681 | { |
26b79524 | 682 | Dwarf_Addr eaddr, highaddr; |
576b5237 MH |
683 | GElf_Sym sym; |
684 | const char *symbol; | |
685 | ||
686 | /* Verify the address is correct */ | |
687 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { | |
688 | pr_warning("Failed to get entry address of %s\n", | |
689 | dwarf_diename(sp_die)); | |
690 | return -ENOENT; | |
691 | } | |
692 | if (dwarf_highpc(sp_die, &highaddr) != 0) { | |
693 | pr_warning("Failed to get end address of %s\n", | |
694 | dwarf_diename(sp_die)); | |
695 | return -ENOENT; | |
696 | } | |
697 | if (paddr > highaddr) { | |
698 | pr_warning("Offset specified is greater than size of %s\n", | |
699 | dwarf_diename(sp_die)); | |
700 | return -EINVAL; | |
701 | } | |
702 | ||
703 | /* Get an appropriate symbol from symtab */ | |
704 | symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); | |
705 | if (!symbol) { | |
706 | pr_warning("Failed to find symbol at 0x%lx\n", | |
707 | (unsigned long)paddr); | |
708 | return -ENOENT; | |
709 | } | |
710 | tp->offset = (unsigned long)(paddr - sym.st_value); | |
711 | tp->symbol = strdup(symbol); | |
712 | if (!tp->symbol) | |
713 | return -ENOMEM; | |
4235b045 | 714 | |
04ddd04b | 715 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
716 | if (retprobe) { |
717 | if (eaddr != paddr) { | |
04ddd04b | 718 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 719 | " a real function.\n"); |
04ddd04b MH |
720 | return -EINVAL; |
721 | } | |
cf6eb489 | 722 | tp->retprobe = true; |
04ddd04b MH |
723 | } |
724 | ||
cf6eb489 MH |
725 | return 0; |
726 | } | |
727 | ||
221d0611 MH |
728 | /* Call probe_finder callback with scope DIE */ |
729 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 730 | { |
cf6eb489 MH |
731 | Dwarf_Attribute fb_attr; |
732 | size_t nops; | |
733 | int ret; | |
734 | ||
221d0611 MH |
735 | if (!sc_die) { |
736 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
737 | return -EINVAL; | |
738 | } | |
739 | ||
740 | /* If not a real subprogram, find a real one */ | |
0dbb1cac | 741 | if (!die_is_func_def(sc_die)) { |
221d0611 | 742 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
cf6eb489 MH |
743 | pr_warning("Failed to find probe point in any " |
744 | "functions.\n"); | |
745 | return -ENOENT; | |
746 | } | |
221d0611 MH |
747 | } else |
748 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 749 | |
221d0611 MH |
750 | /* Get the frame base attribute/ops from subprogram */ |
751 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 752 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 753 | if (ret <= 0 || nops == 0) { |
804b3606 | 754 | pf->fb_ops = NULL; |
7752f1b0 | 755 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
756 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
757 | pf->cfi != NULL) { | |
758 | Dwarf_Frame *frame; | |
b55a87ad MH |
759 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
760 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 761 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
762 | (uintmax_t)pf->addr); |
763 | return -ENOENT; | |
764 | } | |
7752f1b0 | 765 | #endif |
a34a9854 | 766 | } |
804b3606 | 767 | |
cf6eb489 | 768 | /* Call finder's callback handler */ |
221d0611 | 769 | ret = pf->callback(sc_die, pf); |
804b3606 MH |
770 | |
771 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
772 | pf->fb_ops = NULL; | |
cf6eb489 MH |
773 | |
774 | return ret; | |
4ea42b18 MH |
775 | } |
776 | ||
221d0611 MH |
777 | struct find_scope_param { |
778 | const char *function; | |
779 | const char *file; | |
780 | int line; | |
781 | int diff; | |
782 | Dwarf_Die *die_mem; | |
783 | bool found; | |
784 | }; | |
785 | ||
786 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
787 | { | |
788 | struct find_scope_param *fsp = data; | |
789 | const char *file; | |
790 | int lno; | |
791 | ||
792 | /* Skip if declared file name does not match */ | |
793 | if (fsp->file) { | |
794 | file = dwarf_decl_file(fn_die); | |
795 | if (!file || strcmp(fsp->file, file) != 0) | |
796 | return 0; | |
797 | } | |
798 | /* If the function name is given, that's what user expects */ | |
799 | if (fsp->function) { | |
800 | if (die_compare_name(fn_die, fsp->function)) { | |
801 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
802 | fsp->found = true; | |
803 | return 1; | |
804 | } | |
805 | } else { | |
806 | /* With the line number, find the nearest declared DIE */ | |
807 | dwarf_decl_line(fn_die, &lno); | |
808 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
809 | /* Keep a candidate and continue */ | |
810 | fsp->diff = fsp->line - lno; | |
811 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
812 | fsp->found = true; | |
813 | } | |
814 | } | |
815 | return 0; | |
816 | } | |
817 | ||
818 | /* Find an appropriate scope fits to given conditions */ | |
819 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
820 | { | |
821 | struct find_scope_param fsp = { | |
822 | .function = pf->pev->point.function, | |
823 | .file = pf->fname, | |
824 | .line = pf->lno, | |
825 | .diff = INT_MAX, | |
826 | .die_mem = die_mem, | |
827 | .found = false, | |
828 | }; | |
829 | ||
830 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); | |
831 | ||
832 | return fsp.found ? die_mem : NULL; | |
833 | } | |
834 | ||
4cc9cec6 MH |
835 | static int probe_point_line_walker(const char *fname, int lineno, |
836 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 837 | { |
4cc9cec6 | 838 | struct probe_finder *pf = data; |
221d0611 | 839 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 840 | int ret; |
4ea42b18 | 841 | |
4cc9cec6 MH |
842 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
843 | return 0; | |
4ea42b18 | 844 | |
4cc9cec6 | 845 | pf->addr = addr; |
221d0611 MH |
846 | sc_die = find_best_scope(pf, &die_mem); |
847 | if (!sc_die) { | |
848 | pr_warning("Failed to find scope of probe point.\n"); | |
849 | return -ENOENT; | |
850 | } | |
851 | ||
852 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 853 | |
4cc9cec6 | 854 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 855 | return ret < 0 ? ret : 0; |
4cc9cec6 | 856 | } |
804b3606 | 857 | |
4cc9cec6 MH |
858 | /* Find probe point from its line number */ |
859 | static int find_probe_point_by_line(struct probe_finder *pf) | |
860 | { | |
861 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
862 | } |
863 | ||
2a9c8c36 MH |
864 | /* Find lines which match lazy pattern */ |
865 | static int find_lazy_match_lines(struct list_head *head, | |
866 | const char *fname, const char *pat) | |
867 | { | |
f50c2169 FBH |
868 | FILE *fp; |
869 | char *line = NULL; | |
870 | size_t line_len; | |
871 | ssize_t len; | |
872 | int count = 0, linenum = 1; | |
873 | ||
874 | fp = fopen(fname, "r"); | |
875 | if (!fp) { | |
876 | pr_warning("Failed to open %s: %s\n", fname, strerror(errno)); | |
b448c4b6 | 877 | return -errno; |
b55a87ad MH |
878 | } |
879 | ||
f50c2169 | 880 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 881 | |
f50c2169 FBH |
882 | if (line[len - 1] == '\n') |
883 | line[len - 1] = '\0'; | |
884 | ||
885 | if (strlazymatch(line, pat)) { | |
886 | line_list__add_line(head, linenum); | |
887 | count++; | |
2a9c8c36 | 888 | } |
f50c2169 | 889 | linenum++; |
2a9c8c36 | 890 | } |
f50c2169 FBH |
891 | |
892 | if (ferror(fp)) | |
893 | count = -errno; | |
894 | free(line); | |
895 | fclose(fp); | |
896 | ||
897 | if (count == 0) | |
898 | pr_debug("No matched lines found in %s.\n", fname); | |
899 | return count; | |
2a9c8c36 MH |
900 | } |
901 | ||
4cc9cec6 MH |
902 | static int probe_point_lazy_walker(const char *fname, int lineno, |
903 | Dwarf_Addr addr, void *data) | |
904 | { | |
905 | struct probe_finder *pf = data; | |
221d0611 | 906 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
907 | int ret; |
908 | ||
909 | if (!line_list__has_line(&pf->lcache, lineno) || | |
910 | strtailcmp(fname, pf->fname) != 0) | |
911 | return 0; | |
912 | ||
913 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
914 | lineno, (unsigned long long)addr); | |
915 | pf->addr = addr; | |
221d0611 MH |
916 | pf->lno = lineno; |
917 | sc_die = find_best_scope(pf, &die_mem); | |
918 | if (!sc_die) { | |
919 | pr_warning("Failed to find scope of probe point.\n"); | |
920 | return -ENOENT; | |
921 | } | |
922 | ||
923 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
924 | |
925 | /* | |
926 | * Continue if no error, because the lazy pattern will match | |
927 | * to other lines | |
928 | */ | |
5e814dd5 | 929 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
930 | } |
931 | ||
2a9c8c36 | 932 | /* Find probe points from lazy pattern */ |
b55a87ad | 933 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 934 | { |
b55a87ad | 935 | int ret = 0; |
2a9c8c36 MH |
936 | |
937 | if (list_empty(&pf->lcache)) { | |
938 | /* Matching lazy line pattern */ | |
939 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 940 | pf->pev->point.lazy_line); |
f50c2169 | 941 | if (ret <= 0) |
b55a87ad | 942 | return ret; |
2a9c8c36 MH |
943 | } |
944 | ||
4cc9cec6 | 945 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
946 | } |
947 | ||
e92b85e1 MH |
948 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
949 | { | |
db0d2c64 | 950 | struct probe_finder *pf = data; |
4235b045 | 951 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 952 | Dwarf_Addr addr; |
db0d2c64 | 953 | int ret; |
e92b85e1 | 954 | |
2a9c8c36 | 955 | if (pp->lazy_line) |
db0d2c64 | 956 | ret = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
957 | else { |
958 | /* Get probe address */ | |
b55a87ad | 959 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 960 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad | 961 | dwarf_diename(in_die)); |
db0d2c64 | 962 | return -ENOENT; |
b55a87ad MH |
963 | } |
964 | pf->addr = addr; | |
2a9c8c36 MH |
965 | pf->addr += pp->offset; |
966 | pr_debug("found inline addr: 0x%jx\n", | |
967 | (uintmax_t)pf->addr); | |
968 | ||
db0d2c64 | 969 | ret = call_probe_finder(in_die, pf); |
2a9c8c36 | 970 | } |
e92b85e1 | 971 | |
db0d2c64 | 972 | return ret; |
e92b85e1 | 973 | } |
804b3606 | 974 | |
db0d2c64 MH |
975 | /* Callback parameter with return value for libdw */ |
976 | struct dwarf_callback_param { | |
977 | void *data; | |
978 | int retval; | |
979 | }; | |
980 | ||
4ea42b18 | 981 | /* Search function from function name */ |
e92b85e1 | 982 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 983 | { |
b55a87ad MH |
984 | struct dwarf_callback_param *param = data; |
985 | struct probe_finder *pf = param->data; | |
4235b045 | 986 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 987 | |
e92b85e1 | 988 | /* Check tag and diename */ |
0dbb1cac MH |
989 | if (!die_is_func_def(sp_die) || |
990 | !die_compare_name(sp_die, pp->function)) | |
b55a87ad | 991 | return DWARF_CB_OK; |
e92b85e1 | 992 | |
7d21635a MH |
993 | /* Check declared file */ |
994 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
995 | return DWARF_CB_OK; | |
996 | ||
2a9c8c36 | 997 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 998 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
999 | dwarf_decl_line(sp_die, &pf->lno); |
1000 | pf->lno += pp->line; | |
b55a87ad | 1001 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
1002 | } else if (!dwarf_func_inline(sp_die)) { |
1003 | /* Real function */ | |
2a9c8c36 | 1004 | if (pp->lazy_line) |
b55a87ad | 1005 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1006 | else { |
b55a87ad | 1007 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
0e43e5d2 MH |
1008 | pr_warning("Failed to get entry address of " |
1009 | "%s.\n", dwarf_diename(sp_die)); | |
b55a87ad MH |
1010 | param->retval = -ENOENT; |
1011 | return DWARF_CB_ABORT; | |
1012 | } | |
2a9c8c36 MH |
1013 | pf->addr += pp->offset; |
1014 | /* TODO: Check the address in this function */ | |
cf6eb489 | 1015 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 1016 | } |
db0d2c64 | 1017 | } else |
e92b85e1 | 1018 | /* Inlined function: search instances */ |
db0d2c64 MH |
1019 | param->retval = die_walk_instances(sp_die, |
1020 | probe_point_inline_cb, (void *)pf); | |
e92b85e1 | 1021 | |
b55a87ad | 1022 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1023 | } |
1024 | ||
b55a87ad | 1025 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1026 | { |
b55a87ad MH |
1027 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1028 | .retval = 0}; | |
1029 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1030 | return _param.retval; | |
4ea42b18 MH |
1031 | } |
1032 | ||
cd25f8bc LM |
1033 | struct pubname_callback_param { |
1034 | char *function; | |
1035 | char *file; | |
1036 | Dwarf_Die *cu_die; | |
1037 | Dwarf_Die *sp_die; | |
1038 | int found; | |
1039 | }; | |
1040 | ||
1041 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
1042 | { | |
1043 | struct pubname_callback_param *param = data; | |
1044 | ||
1045 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1046 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1047 | return DWARF_CB_OK; | |
1048 | ||
1049 | if (die_compare_name(param->sp_die, param->function)) { | |
1050 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) | |
1051 | return DWARF_CB_OK; | |
1052 | ||
1053 | if (param->file && | |
1054 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1055 | return DWARF_CB_OK; | |
1056 | ||
1057 | param->found = 1; | |
1058 | return DWARF_CB_ABORT; | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | return DWARF_CB_OK; | |
1063 | } | |
1064 | ||
cf6eb489 | 1065 | /* Find probe points from debuginfo */ |
ff741783 MH |
1066 | static int debuginfo__find_probes(struct debuginfo *self, |
1067 | struct probe_finder *pf) | |
4ea42b18 | 1068 | { |
cf6eb489 | 1069 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1070 | Dwarf_Off off, noff; |
1071 | size_t cuhl; | |
1072 | Dwarf_Die *diep; | |
b55a87ad | 1073 | int ret = 0; |
804b3606 | 1074 | |
7752f1b0 | 1075 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 1076 | /* Get the call frame information from this dwarf */ |
ff741783 | 1077 | pf->cfi = dwarf_getcfi(self->dbg); |
7752f1b0 | 1078 | #endif |
a34a9854 | 1079 | |
804b3606 | 1080 | off = 0; |
cf6eb489 | 1081 | line_list__init(&pf->lcache); |
cd25f8bc LM |
1082 | |
1083 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
1084 | if (pp->function) { | |
1085 | struct pubname_callback_param pubname_param = { | |
1086 | .function = pp->function, | |
1087 | .file = pp->file, | |
1088 | .cu_die = &pf->cu_die, | |
1089 | .sp_die = &pf->sp_die, | |
2b348a77 | 1090 | .found = 0, |
cd25f8bc LM |
1091 | }; |
1092 | struct dwarf_callback_param probe_param = { | |
1093 | .data = pf, | |
1094 | }; | |
1095 | ||
ff741783 MH |
1096 | dwarf_getpubnames(self->dbg, pubname_search_cb, |
1097 | &pubname_param, 0); | |
cd25f8bc LM |
1098 | if (pubname_param.found) { |
1099 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1100 | if (ret) | |
1101 | goto found; | |
1102 | } | |
1103 | } | |
1104 | ||
804b3606 | 1105 | /* Loop on CUs (Compilation Unit) */ |
ff741783 | 1106 | while (!dwarf_nextcu(self->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1107 | /* Get the DIE(Debugging Information Entry) of this CU */ |
ff741783 | 1108 | diep = dwarf_offdie(self->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1109 | if (!diep) |
1110 | continue; | |
4ea42b18 MH |
1111 | |
1112 | /* Check if target file is included. */ | |
1113 | if (pp->file) | |
cf6eb489 | 1114 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1115 | else |
cf6eb489 | 1116 | pf->fname = NULL; |
4ea42b18 | 1117 | |
cf6eb489 | 1118 | if (!pp->file || pf->fname) { |
4ea42b18 | 1119 | if (pp->function) |
cf6eb489 | 1120 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1121 | else if (pp->lazy_line) |
cf6eb489 | 1122 | ret = find_probe_point_lazy(NULL, pf); |
b0ef0732 | 1123 | else { |
cf6eb489 MH |
1124 | pf->lno = pp->line; |
1125 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1126 | } |
8635bf6e | 1127 | if (ret < 0) |
fbee632d | 1128 | break; |
4ea42b18 | 1129 | } |
804b3606 | 1130 | off = noff; |
4ea42b18 | 1131 | } |
cd25f8bc LM |
1132 | |
1133 | found: | |
cf6eb489 | 1134 | line_list__free(&pf->lcache); |
4ea42b18 | 1135 | |
cf6eb489 MH |
1136 | return ret; |
1137 | } | |
1138 | ||
1139 | /* Add a found probe point into trace event list */ | |
221d0611 | 1140 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1141 | { |
1142 | struct trace_event_finder *tf = | |
1143 | container_of(pf, struct trace_event_finder, pf); | |
1144 | struct probe_trace_event *tev; | |
1145 | int ret, i; | |
1146 | ||
1147 | /* Check number of tevs */ | |
1148 | if (tf->ntevs == tf->max_tevs) { | |
1149 | pr_warning("Too many( > %d) probe point found.\n", | |
1150 | tf->max_tevs); | |
1151 | return -ERANGE; | |
1152 | } | |
1153 | tev = &tf->tevs[tf->ntevs++]; | |
1154 | ||
221d0611 | 1155 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1156 | ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, |
221d0611 | 1157 | pf->pev->point.retprobe, &tev->point); |
cf6eb489 MH |
1158 | if (ret < 0) |
1159 | return ret; | |
1160 | ||
1161 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, | |
1162 | tev->point.offset); | |
1163 | ||
1164 | /* Find each argument */ | |
1165 | tev->nargs = pf->pev->nargs; | |
1166 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1167 | if (tev->args == NULL) | |
1168 | return -ENOMEM; | |
1169 | for (i = 0; i < pf->pev->nargs; i++) { | |
1170 | pf->pvar = &pf->pev->args[i]; | |
1171 | pf->tvar = &tev->args[i]; | |
221d0611 MH |
1172 | /* Variable should be found from scope DIE */ |
1173 | ret = find_variable(sc_die, pf); | |
cf6eb489 MH |
1174 | if (ret != 0) |
1175 | return ret; | |
1176 | } | |
1177 | ||
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
ff741783 MH |
1182 | int debuginfo__find_trace_events(struct debuginfo *self, |
1183 | struct perf_probe_event *pev, | |
1184 | struct probe_trace_event **tevs, int max_tevs) | |
cf6eb489 MH |
1185 | { |
1186 | struct trace_event_finder tf = { | |
1187 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
576b5237 | 1188 | .mod = self->mod, .max_tevs = max_tevs}; |
cf6eb489 MH |
1189 | int ret; |
1190 | ||
1191 | /* Allocate result tevs array */ | |
1192 | *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); | |
1193 | if (*tevs == NULL) | |
1194 | return -ENOMEM; | |
1195 | ||
1196 | tf.tevs = *tevs; | |
1197 | tf.ntevs = 0; | |
1198 | ||
ff741783 | 1199 | ret = debuginfo__find_probes(self, &tf.pf); |
cf6eb489 MH |
1200 | if (ret < 0) { |
1201 | free(*tevs); | |
1202 | *tevs = NULL; | |
1203 | return ret; | |
1204 | } | |
1205 | ||
1206 | return (ret < 0) ? ret : tf.ntevs; | |
1207 | } | |
1208 | ||
1209 | #define MAX_VAR_LEN 64 | |
1210 | ||
1211 | /* Collect available variables in this scope */ | |
1212 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1213 | { | |
1214 | struct available_var_finder *af = data; | |
1215 | struct variable_list *vl; | |
1216 | char buf[MAX_VAR_LEN]; | |
1217 | int tag, ret; | |
1218 | ||
1219 | vl = &af->vls[af->nvls - 1]; | |
1220 | ||
1221 | tag = dwarf_tag(die_mem); | |
1222 | if (tag == DW_TAG_formal_parameter || | |
1223 | tag == DW_TAG_variable) { | |
1224 | ret = convert_variable_location(die_mem, af->pf.addr, | |
1225 | af->pf.fb_ops, NULL); | |
1226 | if (ret == 0) { | |
1227 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); | |
fb8c5a56 | 1228 | pr_debug2("Add new var: %s\n", buf); |
cf6eb489 MH |
1229 | if (ret > 0) |
1230 | strlist__add(vl->vars, buf); | |
1231 | } | |
1232 | } | |
1233 | ||
fb8c5a56 | 1234 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1235 | return DIE_FIND_CB_CONTINUE; |
1236 | else | |
1237 | return DIE_FIND_CB_SIBLING; | |
1238 | } | |
1239 | ||
1240 | /* Add a found vars into available variables list */ | |
221d0611 | 1241 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1242 | { |
1243 | struct available_var_finder *af = | |
1244 | container_of(pf, struct available_var_finder, pf); | |
1245 | struct variable_list *vl; | |
f182e3e1 MH |
1246 | Dwarf_Die die_mem; |
1247 | int ret; | |
cf6eb489 MH |
1248 | |
1249 | /* Check number of tevs */ | |
1250 | if (af->nvls == af->max_vls) { | |
1251 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1252 | return -ERANGE; | |
1253 | } | |
1254 | vl = &af->vls[af->nvls++]; | |
1255 | ||
221d0611 | 1256 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1257 | ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, |
221d0611 | 1258 | pf->pev->point.retprobe, &vl->point); |
cf6eb489 MH |
1259 | if (ret < 0) |
1260 | return ret; | |
1261 | ||
1262 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1263 | vl->point.offset); | |
1264 | ||
1265 | /* Find local variables */ | |
1266 | vl->vars = strlist__new(true, NULL); | |
1267 | if (vl->vars == NULL) | |
1268 | return -ENOMEM; | |
fb8c5a56 | 1269 | af->child = true; |
221d0611 | 1270 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1271 | |
fb8c5a56 MH |
1272 | /* Find external variables */ |
1273 | if (!af->externs) | |
1274 | goto out; | |
1275 | /* Don't need to search child DIE for externs. */ | |
1276 | af->child = false; | |
f182e3e1 | 1277 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
fb8c5a56 MH |
1278 | |
1279 | out: | |
cf6eb489 MH |
1280 | if (strlist__empty(vl->vars)) { |
1281 | strlist__delete(vl->vars); | |
1282 | vl->vars = NULL; | |
1283 | } | |
1284 | ||
1285 | return ret; | |
1286 | } | |
1287 | ||
1288 | /* Find available variables at given probe point */ | |
ff741783 MH |
1289 | int debuginfo__find_available_vars_at(struct debuginfo *self, |
1290 | struct perf_probe_event *pev, | |
1291 | struct variable_list **vls, | |
1292 | int max_vls, bool externs) | |
cf6eb489 MH |
1293 | { |
1294 | struct available_var_finder af = { | |
1295 | .pf = {.pev = pev, .callback = add_available_vars}, | |
576b5237 | 1296 | .mod = self->mod, |
fb8c5a56 | 1297 | .max_vls = max_vls, .externs = externs}; |
cf6eb489 MH |
1298 | int ret; |
1299 | ||
1300 | /* Allocate result vls array */ | |
1301 | *vls = zalloc(sizeof(struct variable_list) * max_vls); | |
1302 | if (*vls == NULL) | |
1303 | return -ENOMEM; | |
1304 | ||
1305 | af.vls = *vls; | |
1306 | af.nvls = 0; | |
1307 | ||
ff741783 | 1308 | ret = debuginfo__find_probes(self, &af.pf); |
cf6eb489 MH |
1309 | if (ret < 0) { |
1310 | /* Free vlist for error */ | |
1311 | while (af.nvls--) { | |
1312 | if (af.vls[af.nvls].point.symbol) | |
1313 | free(af.vls[af.nvls].point.symbol); | |
1314 | if (af.vls[af.nvls].vars) | |
1315 | strlist__delete(af.vls[af.nvls].vars); | |
1316 | } | |
1317 | free(af.vls); | |
1318 | *vls = NULL; | |
1319 | return ret; | |
1320 | } | |
1321 | ||
1322 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1323 | } |
1324 | ||
fb1587d8 | 1325 | /* Reverse search */ |
ff741783 MH |
1326 | int debuginfo__find_probe_point(struct debuginfo *self, unsigned long addr, |
1327 | struct perf_probe_point *ppt) | |
fb1587d8 MH |
1328 | { |
1329 | Dwarf_Die cudie, spdie, indie; | |
ff741783 | 1330 | Dwarf_Addr _addr, baseaddr; |
1d46ea2a MH |
1331 | const char *fname = NULL, *func = NULL, *tmp; |
1332 | int baseline = 0, lineno = 0, ret = 0; | |
fb1587d8 | 1333 | |
469b9b88 | 1334 | /* Adjust address with bias */ |
ff741783 MH |
1335 | addr += self->bias; |
1336 | ||
fb1587d8 | 1337 | /* Find cu die */ |
ff741783 | 1338 | if (!dwarf_addrdie(self->dbg, (Dwarf_Addr)addr - self->bias, &cudie)) { |
0e43e5d2 MH |
1339 | pr_warning("Failed to find debug information for address %lx\n", |
1340 | addr); | |
75ec5a24 MH |
1341 | ret = -EINVAL; |
1342 | goto end; | |
1343 | } | |
fb1587d8 | 1344 | |
1d46ea2a MH |
1345 | /* Find a corresponding line (filename and lineno) */ |
1346 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1347 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1348 | |
1d46ea2a | 1349 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1350 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1351 | /* Get function entry information */ |
fb1587d8 | 1352 | tmp = dwarf_diename(&spdie); |
1d46ea2a MH |
1353 | if (!tmp || |
1354 | dwarf_entrypc(&spdie, &baseaddr) != 0 || | |
1355 | dwarf_decl_line(&spdie, &baseline) != 0) | |
1356 | goto post; | |
1357 | func = tmp; | |
1358 | ||
1359 | if (addr == (unsigned long)baseaddr) | |
1360 | /* Function entry - Relative line number is 0 */ | |
1361 | lineno = baseline; | |
1362 | else if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1363 | &indie)) { | |
1364 | if (dwarf_entrypc(&indie, &_addr) == 0 && | |
1365 | _addr == addr) | |
1366 | /* | |
1367 | * addr is at an inline function entry. | |
1368 | * In this case, lineno should be the call-site | |
1369 | * line number. | |
1370 | */ | |
1371 | lineno = die_get_call_lineno(&indie); | |
1372 | else { | |
1373 | /* | |
1374 | * addr is in an inline function body. | |
1375 | * Since lineno points one of the lines | |
1376 | * of the inline function, baseline should | |
1377 | * be the entry line of the inline function. | |
1378 | */ | |
b55a87ad | 1379 | tmp = dwarf_diename(&indie); |
1d46ea2a MH |
1380 | if (tmp && |
1381 | dwarf_decl_line(&spdie, &baseline) == 0) | |
1382 | func = tmp; | |
b55a87ad | 1383 | } |
fb1587d8 | 1384 | } |
1d46ea2a MH |
1385 | } |
1386 | ||
1387 | post: | |
1388 | /* Make a relative line number or an offset */ | |
1389 | if (lineno) | |
1390 | ppt->line = lineno - baseline; | |
1391 | else if (func) | |
1392 | ppt->offset = addr - (unsigned long)baseaddr; | |
1393 | ||
1394 | /* Duplicate strings */ | |
1395 | if (func) { | |
1396 | ppt->function = strdup(func); | |
02b95dad MH |
1397 | if (ppt->function == NULL) { |
1398 | ret = -ENOMEM; | |
1399 | goto end; | |
1400 | } | |
fb1587d8 | 1401 | } |
1d46ea2a MH |
1402 | if (fname) { |
1403 | ppt->file = strdup(fname); | |
1404 | if (ppt->file == NULL) { | |
1405 | if (ppt->function) { | |
1406 | free(ppt->function); | |
1407 | ppt->function = NULL; | |
1408 | } | |
1409 | ret = -ENOMEM; | |
1410 | goto end; | |
1411 | } | |
1412 | } | |
fb1587d8 | 1413 | end: |
1d46ea2a MH |
1414 | if (ret == 0 && (fname || func)) |
1415 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1416 | return ret; |
1417 | } | |
1418 | ||
f6c903f5 MH |
1419 | /* Add a line and store the src path */ |
1420 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1421 | struct line_range *lr) | |
1422 | { | |
7cf0b79e | 1423 | /* Copy source path */ |
f6c903f5 | 1424 | if (!lr->path) { |
7cf0b79e MH |
1425 | lr->path = strdup(src); |
1426 | if (lr->path == NULL) | |
1427 | return -ENOMEM; | |
f6c903f5 MH |
1428 | } |
1429 | return line_list__add_line(&lr->line_list, lineno); | |
1430 | } | |
1431 | ||
4cc9cec6 | 1432 | static int line_range_walk_cb(const char *fname, int lineno, |
1d037ca1 | 1433 | Dwarf_Addr addr __maybe_unused, |
4cc9cec6 | 1434 | void *data) |
f6c903f5 | 1435 | { |
4cc9cec6 | 1436 | struct line_finder *lf = data; |
f6c903f5 | 1437 | |
4cc9cec6 | 1438 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1439 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1440 | return 0; |
f6c903f5 | 1441 | |
4cc9cec6 MH |
1442 | if (line_range_add_line(fname, lineno, lf->lr) < 0) |
1443 | return -EINVAL; | |
f6c903f5 | 1444 | |
4cc9cec6 | 1445 | return 0; |
f6c903f5 | 1446 | } |
fb1587d8 | 1447 | |
631c9def | 1448 | /* Find line range from its line number */ |
b55a87ad | 1449 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1450 | { |
4cc9cec6 | 1451 | int ret; |
f6c903f5 | 1452 | |
4cc9cec6 | 1453 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1454 | |
804b3606 | 1455 | /* Update status */ |
f6c903f5 MH |
1456 | if (ret >= 0) |
1457 | if (!list_empty(&lf->lr->line_list)) | |
1458 | ret = lf->found = 1; | |
1459 | else | |
1460 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1461 | else { |
1462 | free(lf->lr->path); | |
1463 | lf->lr->path = NULL; | |
1464 | } | |
f6c903f5 | 1465 | return ret; |
631c9def MH |
1466 | } |
1467 | ||
161a26b0 MH |
1468 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1469 | { | |
db0d2c64 | 1470 | find_line_range_by_line(in_die, data); |
36c0c588 MH |
1471 | |
1472 | /* | |
1473 | * We have to check all instances of inlined function, because | |
1474 | * some execution paths can be optimized out depends on the | |
1475 | * function argument of instances | |
1476 | */ | |
db0d2c64 | 1477 | return 0; |
161a26b0 MH |
1478 | } |
1479 | ||
0dbb1cac | 1480 | /* Search function definition from function name */ |
e92b85e1 | 1481 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1482 | { |
b55a87ad MH |
1483 | struct dwarf_callback_param *param = data; |
1484 | struct line_finder *lf = param->data; | |
631c9def | 1485 | struct line_range *lr = lf->lr; |
631c9def | 1486 | |
7d21635a MH |
1487 | /* Check declared file */ |
1488 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1489 | return DWARF_CB_OK; | |
1490 | ||
0dbb1cac | 1491 | if (die_is_func_def(sp_die) && |
82175633 | 1492 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1493 | lf->fname = dwarf_decl_file(sp_die); |
1494 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1495 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1496 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1497 | if (lf->lno_s < 0) /* Overflow */ |
1498 | lf->lno_s = INT_MAX; | |
1499 | lf->lno_e = lr->offset + lr->end; | |
1500 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1501 | lf->lno_e = INT_MAX; |
d3b63d7a | 1502 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1503 | lr->start = lf->lno_s; |
1504 | lr->end = lf->lno_e; | |
db0d2c64 MH |
1505 | if (dwarf_func_inline(sp_die)) |
1506 | param->retval = die_walk_instances(sp_die, | |
1507 | line_range_inline_cb, lf); | |
1508 | else | |
b55a87ad MH |
1509 | param->retval = find_line_range_by_line(sp_die, lf); |
1510 | return DWARF_CB_ABORT; | |
631c9def | 1511 | } |
b55a87ad | 1512 | return DWARF_CB_OK; |
631c9def MH |
1513 | } |
1514 | ||
b55a87ad | 1515 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1516 | { |
b55a87ad MH |
1517 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1518 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1519 | return param.retval; | |
631c9def MH |
1520 | } |
1521 | ||
ff741783 | 1522 | int debuginfo__find_line_range(struct debuginfo *self, struct line_range *lr) |
631c9def | 1523 | { |
804b3606 | 1524 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1525 | int ret = 0; |
804b3606 MH |
1526 | Dwarf_Off off = 0, noff; |
1527 | size_t cuhl; | |
1528 | Dwarf_Die *diep; | |
6a330a3c | 1529 | const char *comp_dir; |
804b3606 | 1530 | |
cd25f8bc LM |
1531 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1532 | if (lr->function) { | |
1533 | struct pubname_callback_param pubname_param = { | |
1534 | .function = lr->function, .file = lr->file, | |
1535 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1536 | struct dwarf_callback_param line_range_param = { | |
1537 | .data = (void *)&lf, .retval = 0}; | |
1538 | ||
ff741783 MH |
1539 | dwarf_getpubnames(self->dbg, pubname_search_cb, |
1540 | &pubname_param, 0); | |
cd25f8bc LM |
1541 | if (pubname_param.found) { |
1542 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1543 | if (lf.found) | |
1544 | goto found; | |
1545 | } | |
1546 | } | |
1547 | ||
804b3606 | 1548 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1549 | while (!lf.found && ret >= 0) { |
ff741783 MH |
1550 | if (dwarf_nextcu(self->dbg, off, &noff, &cuhl, |
1551 | NULL, NULL, NULL) != 0) | |
631c9def MH |
1552 | break; |
1553 | ||
1554 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
ff741783 | 1555 | diep = dwarf_offdie(self->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1556 | if (!diep) |
1557 | continue; | |
631c9def MH |
1558 | |
1559 | /* Check if target file is included. */ | |
1560 | if (lr->file) | |
2a9c8c36 | 1561 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1562 | else |
2a9c8c36 | 1563 | lf.fname = 0; |
631c9def | 1564 | |
2a9c8c36 | 1565 | if (!lr->file || lf.fname) { |
631c9def | 1566 | if (lr->function) |
b55a87ad | 1567 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1568 | else { |
1569 | lf.lno_s = lr->start; | |
d3b63d7a | 1570 | lf.lno_e = lr->end; |
b55a87ad | 1571 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1572 | } |
631c9def | 1573 | } |
804b3606 | 1574 | off = noff; |
631c9def | 1575 | } |
6a330a3c | 1576 | |
cd25f8bc | 1577 | found: |
6a330a3c MH |
1578 | /* Store comp_dir */ |
1579 | if (lf.found) { | |
1580 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1581 | if (comp_dir) { | |
1582 | lr->comp_dir = strdup(comp_dir); | |
1583 | if (!lr->comp_dir) | |
1584 | ret = -ENOMEM; | |
1585 | } | |
1586 | } | |
1587 | ||
7cf0b79e | 1588 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1589 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1590 | } |
1591 |