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> | |
33 | #include <ctype.h> | |
cd932c59 | 34 | #include <dwarf-regs.h> |
074fc0e4 | 35 | |
124bb83c | 36 | #include <linux/bitops.h> |
89c69c0e MH |
37 | #include "event.h" |
38 | #include "debug.h" | |
074fc0e4 | 39 | #include "util.h" |
9ed7e1b8 | 40 | #include "symbol.h" |
4ea42b18 MH |
41 | #include "probe-finder.h" |
42 | ||
4984912e MH |
43 | /* Kprobe tracer basic type is up to u64 */ |
44 | #define MAX_BASIC_TYPE_BITS 64 | |
45 | ||
2a9c8c36 MH |
46 | /* Line number list operations */ |
47 | ||
48 | /* Add a line to line number list */ | |
d3b63d7a | 49 | static int line_list__add_line(struct list_head *head, int line) |
2a9c8c36 MH |
50 | { |
51 | struct line_node *ln; | |
52 | struct list_head *p; | |
53 | ||
54 | /* Reverse search, because new line will be the last one */ | |
55 | list_for_each_entry_reverse(ln, head, list) { | |
56 | if (ln->line < line) { | |
57 | p = &ln->list; | |
58 | goto found; | |
59 | } else if (ln->line == line) /* Already exist */ | |
e334016f | 60 | return 1; |
2a9c8c36 MH |
61 | } |
62 | /* List is empty, or the smallest entry */ | |
63 | p = head; | |
64 | found: | |
65 | pr_debug("line list: add a line %u\n", line); | |
e334016f MH |
66 | ln = zalloc(sizeof(struct line_node)); |
67 | if (ln == NULL) | |
68 | return -ENOMEM; | |
2a9c8c36 MH |
69 | ln->line = line; |
70 | INIT_LIST_HEAD(&ln->list); | |
71 | list_add(&ln->list, p); | |
e334016f | 72 | return 0; |
2a9c8c36 MH |
73 | } |
74 | ||
75 | /* Check if the line in line number list */ | |
d3b63d7a | 76 | static int line_list__has_line(struct list_head *head, int line) |
2a9c8c36 MH |
77 | { |
78 | struct line_node *ln; | |
79 | ||
80 | /* Reverse search, because new line will be the last one */ | |
81 | list_for_each_entry(ln, head, list) | |
82 | if (ln->line == line) | |
83 | return 1; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | /* Init line number list */ | |
89 | static void line_list__init(struct list_head *head) | |
90 | { | |
91 | INIT_LIST_HEAD(head); | |
92 | } | |
93 | ||
94 | /* Free line number list */ | |
95 | static void line_list__free(struct list_head *head) | |
96 | { | |
97 | struct line_node *ln; | |
98 | while (!list_empty(head)) { | |
99 | ln = list_first_entry(head, struct line_node, list); | |
100 | list_del(&ln->list); | |
101 | free(ln); | |
102 | } | |
103 | } | |
104 | ||
469b9b88 | 105 | /* Dwarf FL wrappers */ |
469b9b88 MH |
106 | static char *debuginfo_path; /* Currently dummy */ |
107 | ||
108 | static const Dwfl_Callbacks offline_callbacks = { | |
109 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
110 | .debuginfo_path = &debuginfo_path, | |
111 | ||
112 | .section_address = dwfl_offline_section_address, | |
113 | ||
114 | /* We use this table for core files too. */ | |
115 | .find_elf = dwfl_build_id_find_elf, | |
116 | }; | |
117 | ||
469b9b88 | 118 | /* Get a Dwarf from offline image */ |
ff741783 MH |
119 | static int debuginfo__init_offline_dwarf(struct debuginfo *self, |
120 | const char *path) | |
469b9b88 MH |
121 | { |
122 | Dwfl_Module *mod; | |
ff741783 | 123 | int fd; |
469b9b88 | 124 | |
ff741783 MH |
125 | fd = open(path, O_RDONLY); |
126 | if (fd < 0) | |
127 | return fd; | |
469b9b88 | 128 | |
ff741783 MH |
129 | self->dwfl = dwfl_begin(&offline_callbacks); |
130 | if (!self->dwfl) | |
131 | goto error; | |
469b9b88 | 132 | |
ff741783 | 133 | mod = dwfl_report_offline(self->dwfl, "", "", fd); |
469b9b88 MH |
134 | if (!mod) |
135 | goto error; | |
136 | ||
ff741783 MH |
137 | self->dbg = dwfl_module_getdwarf(mod, &self->bias); |
138 | if (!self->dbg) | |
139 | goto error; | |
140 | ||
141 | return 0; | |
469b9b88 | 142 | error: |
ff741783 MH |
143 | if (self->dwfl) |
144 | dwfl_end(self->dwfl); | |
145 | else | |
146 | close(fd); | |
147 | memset(self, 0, sizeof(*self)); | |
148 | ||
149 | return -ENOENT; | |
469b9b88 MH |
150 | } |
151 | ||
3b4694de MH |
152 | #if _ELFUTILS_PREREQ(0, 148) |
153 | /* This method is buggy if elfutils is older than 0.148 */ | |
154 | static int __linux_kernel_find_elf(Dwfl_Module *mod, | |
155 | void **userdata, | |
156 | const char *module_name, | |
157 | Dwarf_Addr base, | |
158 | char **file_name, Elf **elfp) | |
159 | { | |
160 | int fd; | |
161 | const char *path = kernel_get_module_path(module_name); | |
162 | ||
163 | pr_debug2("Use file %s for %s\n", path, module_name); | |
164 | if (path) { | |
165 | fd = open(path, O_RDONLY); | |
166 | if (fd >= 0) { | |
167 | *file_name = strdup(path); | |
168 | return fd; | |
169 | } | |
170 | } | |
171 | /* If failed, try to call standard method */ | |
172 | return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base, | |
173 | file_name, elfp); | |
174 | } | |
175 | ||
176 | static const Dwfl_Callbacks kernel_callbacks = { | |
177 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
178 | .debuginfo_path = &debuginfo_path, | |
179 | ||
180 | .find_elf = __linux_kernel_find_elf, | |
181 | .section_address = dwfl_linux_kernel_module_section_address, | |
182 | }; | |
183 | ||
469b9b88 | 184 | /* Get a Dwarf from live kernel image */ |
ff741783 MH |
185 | static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self, |
186 | Dwarf_Addr addr) | |
469b9b88 | 187 | { |
ff741783 MH |
188 | self->dwfl = dwfl_begin(&kernel_callbacks); |
189 | if (!self->dwfl) | |
190 | return -EINVAL; | |
469b9b88 MH |
191 | |
192 | /* Load the kernel dwarves: Don't care the result here */ | |
ff741783 MH |
193 | dwfl_linux_kernel_report_kernel(self->dwfl); |
194 | dwfl_linux_kernel_report_modules(self->dwfl); | |
469b9b88 | 195 | |
ff741783 | 196 | self->dbg = dwfl_addrdwarf(self->dwfl, addr, &self->bias); |
469b9b88 | 197 | /* Here, check whether we could get a real dwarf */ |
ff741783 | 198 | if (!self->dbg) { |
3b4694de MH |
199 | pr_debug("Failed to find kernel dwarf at %lx\n", |
200 | (unsigned long)addr); | |
ff741783 MH |
201 | dwfl_end(self->dwfl); |
202 | memset(self, 0, sizeof(*self)); | |
203 | return -ENOENT; | |
469b9b88 | 204 | } |
ff741783 MH |
205 | |
206 | return 0; | |
469b9b88 | 207 | } |
3b4694de MH |
208 | #else |
209 | /* With older elfutils, this just support kernel module... */ | |
ff741783 MH |
210 | static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self, |
211 | Dwarf_Addr addr __used) | |
3b4694de | 212 | { |
3b4694de MH |
213 | const char *path = kernel_get_module_path("kernel"); |
214 | ||
215 | if (!path) { | |
216 | pr_err("Failed to find vmlinux path\n"); | |
ff741783 | 217 | return -ENOENT; |
3b4694de MH |
218 | } |
219 | ||
220 | pr_debug2("Use file %s for debuginfo\n", path); | |
ff741783 MH |
221 | return debuginfo__init_offline_dwarf(self, path); |
222 | } | |
223 | #endif | |
224 | ||
225 | struct debuginfo *debuginfo__new(const char *path) | |
226 | { | |
227 | struct debuginfo *self = zalloc(sizeof(struct debuginfo)); | |
228 | if (!self) | |
3b4694de MH |
229 | return NULL; |
230 | ||
ff741783 MH |
231 | if (debuginfo__init_offline_dwarf(self, path) < 0) { |
232 | free(self); | |
233 | self = NULL; | |
234 | } | |
235 | ||
236 | return self; | |
237 | } | |
238 | ||
239 | struct debuginfo *debuginfo__new_online_kernel(unsigned long addr) | |
240 | { | |
241 | struct debuginfo *self = zalloc(sizeof(struct debuginfo)); | |
242 | if (!self) | |
243 | return NULL; | |
244 | ||
245 | if (debuginfo__init_online_kernel_dwarf(self, (Dwarf_Addr)addr) < 0) { | |
246 | free(self); | |
247 | self = NULL; | |
248 | } | |
249 | ||
250 | return self; | |
251 | } | |
252 | ||
253 | void debuginfo__delete(struct debuginfo *self) | |
254 | { | |
255 | if (self) { | |
256 | if (self->dwfl) | |
257 | dwfl_end(self->dwfl); | |
258 | free(self); | |
259 | } | |
3b4694de | 260 | } |
469b9b88 | 261 | |
4ea42b18 MH |
262 | /* |
263 | * Probe finder related functions | |
264 | */ | |
265 | ||
0e60836b | 266 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 267 | { |
0e60836b SD |
268 | struct probe_trace_arg_ref *ref; |
269 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
270 | if (ref != NULL) |
271 | ref->offset = offs; | |
272 | return ref; | |
273 | } | |
274 | ||
cf6eb489 MH |
275 | /* |
276 | * Convert a location into trace_arg. | |
277 | * If tvar == NULL, this just checks variable can be converted. | |
278 | */ | |
279 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
280 | Dwarf_Op *fb_ops, | |
281 | struct probe_trace_arg *tvar) | |
4ea42b18 | 282 | { |
b7dcb857 MH |
283 | Dwarf_Attribute attr; |
284 | Dwarf_Op *op; | |
285 | size_t nops; | |
804b3606 MH |
286 | unsigned int regn; |
287 | Dwarf_Word offs = 0; | |
4235b045 | 288 | bool ref = false; |
4ea42b18 | 289 | const char *regs; |
b7dcb857 MH |
290 | int ret; |
291 | ||
632941c4 MH |
292 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
293 | goto static_var; | |
294 | ||
b7dcb857 MH |
295 | /* TODO: handle more than 1 exprs */ |
296 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
cf6eb489 | 297 | dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 || |
b7dcb857 MH |
298 | nops == 0) { |
299 | /* TODO: Support const_value */ | |
b7dcb857 MH |
300 | return -ENOENT; |
301 | } | |
302 | ||
303 | if (op->atom == DW_OP_addr) { | |
632941c4 | 304 | static_var: |
cf6eb489 MH |
305 | if (!tvar) |
306 | return 0; | |
b7dcb857 MH |
307 | /* Static variables on memory (not stack), make @varname */ |
308 | ret = strlen(dwarf_diename(vr_die)); | |
309 | tvar->value = zalloc(ret + 2); | |
310 | if (tvar->value == NULL) | |
311 | return -ENOMEM; | |
312 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
313 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
314 | if (tvar->ref == NULL) | |
315 | return -ENOMEM; | |
316 | return 0; | |
317 | } | |
4ea42b18 | 318 | |
4ea42b18 | 319 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 320 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 321 | if (fb_ops == NULL) |
b55a87ad | 322 | return -ENOTSUP; |
4235b045 | 323 | ref = true; |
804b3606 | 324 | offs = op->number; |
cf6eb489 | 325 | op = &fb_ops[0]; |
804b3606 | 326 | } |
4ea42b18 | 327 | |
804b3606 MH |
328 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
329 | regn = op->atom - DW_OP_breg0; | |
330 | offs += op->number; | |
4235b045 | 331 | ref = true; |
804b3606 MH |
332 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
333 | regn = op->atom - DW_OP_reg0; | |
334 | } else if (op->atom == DW_OP_bregx) { | |
335 | regn = op->number; | |
336 | offs += op->number2; | |
4235b045 | 337 | ref = true; |
804b3606 MH |
338 | } else if (op->atom == DW_OP_regx) { |
339 | regn = op->number; | |
b55a87ad | 340 | } else { |
cf6eb489 | 341 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
342 | return -ENOTSUP; |
343 | } | |
4ea42b18 | 344 | |
cf6eb489 MH |
345 | if (!tvar) |
346 | return 0; | |
347 | ||
4ea42b18 | 348 | regs = get_arch_regstr(regn); |
b55a87ad | 349 | if (!regs) { |
cf6eb489 | 350 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
351 | pr_warning("Mapping for the register number %u " |
352 | "missing on this architecture.\n", regn); | |
b55a87ad MH |
353 | return -ERANGE; |
354 | } | |
4ea42b18 | 355 | |
02b95dad MH |
356 | tvar->value = strdup(regs); |
357 | if (tvar->value == NULL) | |
358 | return -ENOMEM; | |
359 | ||
4235b045 | 360 | if (ref) { |
b7dcb857 | 361 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
362 | if (tvar->ref == NULL) |
363 | return -ENOMEM; | |
4235b045 | 364 | } |
b55a87ad | 365 | return 0; |
4ea42b18 MH |
366 | } |
367 | ||
124bb83c MH |
368 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
369 | ||
b55a87ad | 370 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 371 | struct probe_trace_arg *tvar, |
73317b95 | 372 | const char *cast) |
4984912e | 373 | { |
0e60836b | 374 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
375 | Dwarf_Die type; |
376 | char buf[16]; | |
bcfc0821 | 377 | int bsize, boffs, total; |
4984912e MH |
378 | int ret; |
379 | ||
73317b95 MH |
380 | /* TODO: check all types */ |
381 | if (cast && strcmp(cast, "string") != 0) { | |
382 | /* Non string type is OK */ | |
383 | tvar->type = strdup(cast); | |
384 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
385 | } | |
386 | ||
bcfc0821 MH |
387 | bsize = dwarf_bitsize(vr_die); |
388 | if (bsize > 0) { | |
124bb83c | 389 | /* This is a bitfield */ |
bcfc0821 MH |
390 | boffs = dwarf_bitoffset(vr_die); |
391 | total = dwarf_bytesize(vr_die); | |
392 | if (boffs < 0 || total < 0) | |
393 | return -ENOENT; | |
394 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
395 | BYTES_TO_BITS(total)); | |
124bb83c MH |
396 | goto formatted; |
397 | } | |
398 | ||
b55a87ad MH |
399 | if (die_get_real_type(vr_die, &type) == NULL) { |
400 | pr_warning("Failed to get a type information of %s.\n", | |
401 | dwarf_diename(vr_die)); | |
402 | return -ENOENT; | |
403 | } | |
4984912e | 404 | |
b2a3c12b MH |
405 | pr_debug("%s type is %s.\n", |
406 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
407 | ||
73317b95 MH |
408 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
409 | ret = dwarf_tag(&type); | |
410 | if (ret != DW_TAG_pointer_type && | |
411 | ret != DW_TAG_array_type) { | |
412 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 413 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
414 | dwarf_diename(vr_die), dwarf_diename(&type)); |
415 | return -EINVAL; | |
416 | } | |
417 | if (ret == DW_TAG_pointer_type) { | |
418 | if (die_get_real_type(&type, &type) == NULL) { | |
0e43e5d2 MH |
419 | pr_warning("Failed to get a type" |
420 | " information.\n"); | |
73317b95 MH |
421 | return -ENOENT; |
422 | } | |
423 | while (*ref_ptr) | |
424 | ref_ptr = &(*ref_ptr)->next; | |
425 | /* Add new reference with offset +0 */ | |
0e60836b | 426 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
427 | if (*ref_ptr == NULL) { |
428 | pr_warning("Out of memory error\n"); | |
429 | return -ENOMEM; | |
430 | } | |
431 | } | |
82175633 MH |
432 | if (!die_compare_name(&type, "char") && |
433 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 434 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 435 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
436 | dwarf_diename(vr_die)); |
437 | return -EINVAL; | |
438 | } | |
439 | tvar->type = strdup(cast); | |
440 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
441 | } | |
442 | ||
bcfc0821 MH |
443 | ret = dwarf_bytesize(&type); |
444 | if (ret <= 0) | |
124bb83c MH |
445 | /* No size ... try to use default type */ |
446 | return 0; | |
bcfc0821 | 447 | ret = BYTES_TO_BITS(ret); |
4984912e | 448 | |
124bb83c MH |
449 | /* Check the bitwidth */ |
450 | if (ret > MAX_BASIC_TYPE_BITS) { | |
451 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
452 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
453 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 454 | } |
124bb83c MH |
455 | ret = snprintf(buf, 16, "%c%d", |
456 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
457 | ||
458 | formatted: | |
459 | if (ret < 0 || ret >= 16) { | |
460 | if (ret >= 16) | |
461 | ret = -E2BIG; | |
462 | pr_warning("Failed to convert variable type: %s\n", | |
463 | strerror(-ret)); | |
464 | return ret; | |
465 | } | |
466 | tvar->type = strdup(buf); | |
467 | if (tvar->type == NULL) | |
468 | return -ENOMEM; | |
b55a87ad | 469 | return 0; |
4984912e MH |
470 | } |
471 | ||
b55a87ad | 472 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 473 | struct perf_probe_arg_field *field, |
0e60836b | 474 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 475 | Dwarf_Die *die_mem) |
7df2f329 | 476 | { |
0e60836b | 477 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
478 | Dwarf_Die type; |
479 | Dwarf_Word offs; | |
b2a3c12b | 480 | int ret, tag; |
7df2f329 MH |
481 | |
482 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
483 | if (die_get_real_type(vr_die, &type) == NULL) { |
484 | pr_warning("Failed to get the type of %s.\n", varname); | |
485 | return -ENOENT; | |
486 | } | |
b2a3c12b MH |
487 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
488 | tag = dwarf_tag(&type); | |
489 | ||
490 | if (field->name[0] == '[' && | |
491 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
492 | if (field->next) | |
493 | /* Save original type for next field */ | |
494 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
495 | /* Get the type of this array */ | |
496 | if (die_get_real_type(&type, &type) == NULL) { | |
497 | pr_warning("Failed to get the type of %s.\n", varname); | |
498 | return -ENOENT; | |
499 | } | |
500 | pr_debug2("Array real type: (%x)\n", | |
501 | (unsigned)dwarf_dieoffset(&type)); | |
502 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 503 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
504 | if (ref == NULL) |
505 | return -ENOMEM; | |
506 | if (*ref_ptr) | |
507 | (*ref_ptr)->next = ref; | |
508 | else | |
509 | *ref_ptr = ref; | |
510 | } | |
bcfc0821 | 511 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
512 | if (!field->next) |
513 | /* Save vr_die for converting types */ | |
514 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
515 | goto next; | |
516 | } else if (tag == DW_TAG_pointer_type) { | |
517 | /* Check the pointer and dereference */ | |
b55a87ad MH |
518 | if (!field->ref) { |
519 | pr_err("Semantic error: %s must be referred by '->'\n", | |
520 | field->name); | |
521 | return -EINVAL; | |
522 | } | |
7df2f329 | 523 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
524 | if (die_get_real_type(&type, &type) == NULL) { |
525 | pr_warning("Failed to get the type of %s.\n", varname); | |
526 | return -ENOENT; | |
527 | } | |
12e5a7ae | 528 | /* Verify it is a data structure */ |
b55a87ad MH |
529 | if (dwarf_tag(&type) != DW_TAG_structure_type) { |
530 | pr_warning("%s is not a data structure.\n", varname); | |
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 */ |
b2a3c12b | 543 | if (tag != DW_TAG_structure_type) { |
b55a87ad MH |
544 | pr_warning("%s is not a data structure.\n", varname); |
545 | return -EINVAL; | |
546 | } | |
b2a3c12b | 547 | if (field->name[0] == '[') { |
0e43e5d2 MH |
548 | pr_err("Semantic error: %s is not a pointor" |
549 | " nor array.\n", varname); | |
b2a3c12b MH |
550 | return -EINVAL; |
551 | } | |
b55a87ad MH |
552 | if (field->ref) { |
553 | pr_err("Semantic error: %s must be referred by '.'\n", | |
554 | field->name); | |
555 | return -EINVAL; | |
556 | } | |
557 | if (!ref) { | |
558 | pr_warning("Structure on a register is not " | |
559 | "supported yet.\n"); | |
560 | return -ENOTSUP; | |
561 | } | |
7df2f329 MH |
562 | } |
563 | ||
b55a87ad MH |
564 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
565 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
566 | dwarf_diename(&type), field->name); | |
567 | return -EINVAL; | |
568 | } | |
7df2f329 MH |
569 | |
570 | /* Get the offset of the field */ | |
de1439d8 MH |
571 | ret = die_get_data_member_location(die_mem, &offs); |
572 | if (ret < 0) { | |
b55a87ad | 573 | pr_warning("Failed to get the offset of %s.\n", field->name); |
de1439d8 | 574 | return ret; |
b55a87ad | 575 | } |
7df2f329 MH |
576 | ref->offset += (long)offs; |
577 | ||
b2a3c12b | 578 | next: |
7df2f329 MH |
579 | /* Converting next field */ |
580 | if (field->next) | |
b55a87ad | 581 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 582 | field->next, &ref, die_mem); |
b55a87ad MH |
583 | else |
584 | return 0; | |
7df2f329 MH |
585 | } |
586 | ||
4ea42b18 | 587 | /* Show a variables in kprobe event format */ |
b55a87ad | 588 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 589 | { |
4984912e | 590 | Dwarf_Die die_mem; |
4ea42b18 MH |
591 | int ret; |
592 | ||
b7dcb857 MH |
593 | pr_debug("Converting variable %s into trace event.\n", |
594 | dwarf_diename(vr_die)); | |
804b3606 | 595 | |
cf6eb489 MH |
596 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
597 | pf->tvar); | |
598 | if (ret == -ENOENT) | |
599 | pr_err("Failed to find the location of %s at this address.\n" | |
600 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
601 | else if (ret == -ENOTSUP) | |
602 | pr_err("Sorry, we don't support this variable location yet.\n"); | |
603 | else if (pf->pvar->field) { | |
b55a87ad MH |
604 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
605 | pf->pvar->field, &pf->tvar->ref, | |
606 | &die_mem); | |
4984912e MH |
607 | vr_die = &die_mem; |
608 | } | |
73317b95 MH |
609 | if (ret == 0) |
610 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 611 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 612 | return ret; |
4ea42b18 MH |
613 | } |
614 | ||
221d0611 MH |
615 | /* Find a variable in a scope DIE */ |
616 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 617 | { |
b7dcb857 | 618 | Dwarf_Die vr_die, *scopes; |
11a1ca35 | 619 | char buf[32], *ptr; |
b7dcb857 | 620 | int ret, nscopes; |
4ea42b18 | 621 | |
367e94c1 MH |
622 | if (!is_c_varname(pf->pvar->var)) { |
623 | /* Copy raw parameters */ | |
624 | pf->tvar->value = strdup(pf->pvar->var); | |
625 | if (pf->tvar->value == NULL) | |
626 | return -ENOMEM; | |
627 | if (pf->pvar->type) { | |
628 | pf->tvar->type = strdup(pf->pvar->type); | |
629 | if (pf->tvar->type == NULL) | |
630 | return -ENOMEM; | |
631 | } | |
632 | if (pf->pvar->name) { | |
633 | pf->tvar->name = strdup(pf->pvar->name); | |
634 | if (pf->tvar->name == NULL) | |
635 | return -ENOMEM; | |
636 | } else | |
637 | pf->tvar->name = NULL; | |
638 | return 0; | |
639 | } | |
640 | ||
48481938 | 641 | if (pf->pvar->name) |
02b95dad | 642 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 643 | else { |
02b95dad MH |
644 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
645 | if (ret < 0) | |
646 | return ret; | |
11a1ca35 MH |
647 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
648 | if (ptr) | |
649 | *ptr = '_'; | |
02b95dad | 650 | pf->tvar->name = strdup(buf); |
48481938 | 651 | } |
02b95dad MH |
652 | if (pf->tvar->name == NULL) |
653 | return -ENOMEM; | |
48481938 | 654 | |
b55a87ad MH |
655 | pr_debug("Searching '%s' variable in context.\n", |
656 | pf->pvar->var); | |
657 | /* Search child die for local variables and parameters. */ | |
221d0611 | 658 | if (die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) |
b7dcb857 MH |
659 | ret = convert_variable(&vr_die, pf); |
660 | else { | |
661 | /* Search upper class */ | |
221d0611 | 662 | nscopes = dwarf_getscopes_die(sc_die, &scopes); |
8afa2a70 | 663 | ret = -ENOENT; |
632941c4 MH |
664 | while (nscopes-- > 1) { |
665 | pr_debug("Searching variables in %s\n", | |
666 | dwarf_diename(&scopes[nscopes])); | |
667 | /* We should check this scope, so give dummy address */ | |
668 | if (die_find_variable_at(&scopes[nscopes], | |
669 | pf->pvar->var, 0, | |
670 | &vr_die)) { | |
b7dcb857 | 671 | ret = convert_variable(&vr_die, pf); |
8afa2a70 | 672 | break; |
632941c4 MH |
673 | } |
674 | } | |
675 | if (scopes) | |
b7dcb857 | 676 | free(scopes); |
b7dcb857 MH |
677 | } |
678 | if (ret < 0) | |
b55a87ad MH |
679 | pr_warning("Failed to find '%s' in this function.\n", |
680 | pf->pvar->var); | |
b7dcb857 | 681 | return ret; |
4ea42b18 MH |
682 | } |
683 | ||
cf6eb489 MH |
684 | /* Convert subprogram DIE to trace point */ |
685 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr, | |
686 | bool retprobe, struct probe_trace_point *tp) | |
4ea42b18 | 687 | { |
e92b85e1 | 688 | Dwarf_Addr eaddr; |
804b3606 | 689 | const char *name; |
e92b85e1 | 690 | |
4235b045 | 691 | /* Copy the name of probe point */ |
804b3606 MH |
692 | name = dwarf_diename(sp_die); |
693 | if (name) { | |
b55a87ad | 694 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
0e43e5d2 | 695 | pr_warning("Failed to get entry address of %s\n", |
b55a87ad MH |
696 | dwarf_diename(sp_die)); |
697 | return -ENOENT; | |
698 | } | |
cf6eb489 MH |
699 | tp->symbol = strdup(name); |
700 | if (tp->symbol == NULL) | |
02b95dad | 701 | return -ENOMEM; |
cf6eb489 | 702 | tp->offset = (unsigned long)(paddr - eaddr); |
4235b045 | 703 | } else |
4ea42b18 | 704 | /* This function has no name. */ |
cf6eb489 | 705 | tp->offset = (unsigned long)paddr; |
4235b045 | 706 | |
04ddd04b | 707 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
708 | if (retprobe) { |
709 | if (eaddr != paddr) { | |
04ddd04b | 710 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 711 | " a real function.\n"); |
04ddd04b MH |
712 | return -EINVAL; |
713 | } | |
cf6eb489 | 714 | tp->retprobe = true; |
04ddd04b MH |
715 | } |
716 | ||
cf6eb489 MH |
717 | return 0; |
718 | } | |
719 | ||
221d0611 MH |
720 | /* Call probe_finder callback with scope DIE */ |
721 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 722 | { |
cf6eb489 MH |
723 | Dwarf_Attribute fb_attr; |
724 | size_t nops; | |
725 | int ret; | |
726 | ||
221d0611 MH |
727 | if (!sc_die) { |
728 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
729 | return -EINVAL; | |
730 | } | |
731 | ||
732 | /* If not a real subprogram, find a real one */ | |
733 | if (dwarf_tag(sc_die) != DW_TAG_subprogram) { | |
734 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { | |
cf6eb489 MH |
735 | pr_warning("Failed to find probe point in any " |
736 | "functions.\n"); | |
737 | return -ENOENT; | |
738 | } | |
221d0611 MH |
739 | } else |
740 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 741 | |
221d0611 MH |
742 | /* Get the frame base attribute/ops from subprogram */ |
743 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 744 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 745 | if (ret <= 0 || nops == 0) { |
804b3606 | 746 | pf->fb_ops = NULL; |
7752f1b0 | 747 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
748 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
749 | pf->cfi != NULL) { | |
750 | Dwarf_Frame *frame; | |
b55a87ad MH |
751 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
752 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 753 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
754 | (uintmax_t)pf->addr); |
755 | return -ENOENT; | |
756 | } | |
7752f1b0 | 757 | #endif |
a34a9854 | 758 | } |
804b3606 | 759 | |
cf6eb489 | 760 | /* Call finder's callback handler */ |
221d0611 | 761 | ret = pf->callback(sc_die, pf); |
804b3606 MH |
762 | |
763 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
764 | pf->fb_ops = NULL; | |
cf6eb489 MH |
765 | |
766 | return ret; | |
4ea42b18 MH |
767 | } |
768 | ||
221d0611 MH |
769 | struct find_scope_param { |
770 | const char *function; | |
771 | const char *file; | |
772 | int line; | |
773 | int diff; | |
774 | Dwarf_Die *die_mem; | |
775 | bool found; | |
776 | }; | |
777 | ||
778 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
779 | { | |
780 | struct find_scope_param *fsp = data; | |
781 | const char *file; | |
782 | int lno; | |
783 | ||
784 | /* Skip if declared file name does not match */ | |
785 | if (fsp->file) { | |
786 | file = dwarf_decl_file(fn_die); | |
787 | if (!file || strcmp(fsp->file, file) != 0) | |
788 | return 0; | |
789 | } | |
790 | /* If the function name is given, that's what user expects */ | |
791 | if (fsp->function) { | |
792 | if (die_compare_name(fn_die, fsp->function)) { | |
793 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
794 | fsp->found = true; | |
795 | return 1; | |
796 | } | |
797 | } else { | |
798 | /* With the line number, find the nearest declared DIE */ | |
799 | dwarf_decl_line(fn_die, &lno); | |
800 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
801 | /* Keep a candidate and continue */ | |
802 | fsp->diff = fsp->line - lno; | |
803 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
804 | fsp->found = true; | |
805 | } | |
806 | } | |
807 | return 0; | |
808 | } | |
809 | ||
810 | /* Find an appropriate scope fits to given conditions */ | |
811 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
812 | { | |
813 | struct find_scope_param fsp = { | |
814 | .function = pf->pev->point.function, | |
815 | .file = pf->fname, | |
816 | .line = pf->lno, | |
817 | .diff = INT_MAX, | |
818 | .die_mem = die_mem, | |
819 | .found = false, | |
820 | }; | |
821 | ||
822 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); | |
823 | ||
824 | return fsp.found ? die_mem : NULL; | |
825 | } | |
826 | ||
4cc9cec6 MH |
827 | static int probe_point_line_walker(const char *fname, int lineno, |
828 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 829 | { |
4cc9cec6 | 830 | struct probe_finder *pf = data; |
221d0611 | 831 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 832 | int ret; |
4ea42b18 | 833 | |
4cc9cec6 MH |
834 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
835 | return 0; | |
4ea42b18 | 836 | |
4cc9cec6 | 837 | pf->addr = addr; |
221d0611 MH |
838 | sc_die = find_best_scope(pf, &die_mem); |
839 | if (!sc_die) { | |
840 | pr_warning("Failed to find scope of probe point.\n"); | |
841 | return -ENOENT; | |
842 | } | |
843 | ||
844 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 845 | |
4cc9cec6 | 846 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 847 | return ret < 0 ? ret : 0; |
4cc9cec6 | 848 | } |
804b3606 | 849 | |
4cc9cec6 MH |
850 | /* Find probe point from its line number */ |
851 | static int find_probe_point_by_line(struct probe_finder *pf) | |
852 | { | |
853 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
854 | } |
855 | ||
2a9c8c36 MH |
856 | /* Find lines which match lazy pattern */ |
857 | static int find_lazy_match_lines(struct list_head *head, | |
858 | const char *fname, const char *pat) | |
859 | { | |
f50c2169 FBH |
860 | FILE *fp; |
861 | char *line = NULL; | |
862 | size_t line_len; | |
863 | ssize_t len; | |
864 | int count = 0, linenum = 1; | |
865 | ||
866 | fp = fopen(fname, "r"); | |
867 | if (!fp) { | |
868 | pr_warning("Failed to open %s: %s\n", fname, strerror(errno)); | |
b448c4b6 | 869 | return -errno; |
b55a87ad MH |
870 | } |
871 | ||
f50c2169 | 872 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 873 | |
f50c2169 FBH |
874 | if (line[len - 1] == '\n') |
875 | line[len - 1] = '\0'; | |
876 | ||
877 | if (strlazymatch(line, pat)) { | |
878 | line_list__add_line(head, linenum); | |
879 | count++; | |
2a9c8c36 | 880 | } |
f50c2169 | 881 | linenum++; |
2a9c8c36 | 882 | } |
f50c2169 FBH |
883 | |
884 | if (ferror(fp)) | |
885 | count = -errno; | |
886 | free(line); | |
887 | fclose(fp); | |
888 | ||
889 | if (count == 0) | |
890 | pr_debug("No matched lines found in %s.\n", fname); | |
891 | return count; | |
2a9c8c36 MH |
892 | } |
893 | ||
4cc9cec6 MH |
894 | static int probe_point_lazy_walker(const char *fname, int lineno, |
895 | Dwarf_Addr addr, void *data) | |
896 | { | |
897 | struct probe_finder *pf = data; | |
221d0611 | 898 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
899 | int ret; |
900 | ||
901 | if (!line_list__has_line(&pf->lcache, lineno) || | |
902 | strtailcmp(fname, pf->fname) != 0) | |
903 | return 0; | |
904 | ||
905 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
906 | lineno, (unsigned long long)addr); | |
907 | pf->addr = addr; | |
221d0611 MH |
908 | pf->lno = lineno; |
909 | sc_die = find_best_scope(pf, &die_mem); | |
910 | if (!sc_die) { | |
911 | pr_warning("Failed to find scope of probe point.\n"); | |
912 | return -ENOENT; | |
913 | } | |
914 | ||
915 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
916 | |
917 | /* | |
918 | * Continue if no error, because the lazy pattern will match | |
919 | * to other lines | |
920 | */ | |
5e814dd5 | 921 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
922 | } |
923 | ||
2a9c8c36 | 924 | /* Find probe points from lazy pattern */ |
b55a87ad | 925 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 926 | { |
b55a87ad | 927 | int ret = 0; |
2a9c8c36 MH |
928 | |
929 | if (list_empty(&pf->lcache)) { | |
930 | /* Matching lazy line pattern */ | |
931 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 932 | pf->pev->point.lazy_line); |
f50c2169 | 933 | if (ret <= 0) |
b55a87ad | 934 | return ret; |
2a9c8c36 MH |
935 | } |
936 | ||
4cc9cec6 | 937 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
938 | } |
939 | ||
b55a87ad MH |
940 | /* Callback parameter with return value */ |
941 | struct dwarf_callback_param { | |
942 | void *data; | |
943 | int retval; | |
944 | }; | |
945 | ||
e92b85e1 MH |
946 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
947 | { | |
b55a87ad MH |
948 | struct dwarf_callback_param *param = data; |
949 | struct probe_finder *pf = param->data; | |
4235b045 | 950 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 951 | Dwarf_Addr addr; |
e92b85e1 | 952 | |
2a9c8c36 | 953 | if (pp->lazy_line) |
b55a87ad | 954 | param->retval = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
955 | else { |
956 | /* Get probe address */ | |
b55a87ad | 957 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 958 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad MH |
959 | dwarf_diename(in_die)); |
960 | param->retval = -ENOENT; | |
961 | return DWARF_CB_ABORT; | |
962 | } | |
963 | pf->addr = addr; | |
2a9c8c36 MH |
964 | pf->addr += pp->offset; |
965 | pr_debug("found inline addr: 0x%jx\n", | |
966 | (uintmax_t)pf->addr); | |
967 | ||
cf6eb489 | 968 | param->retval = call_probe_finder(in_die, pf); |
5d1ee041 MH |
969 | if (param->retval < 0) |
970 | return DWARF_CB_ABORT; | |
2a9c8c36 | 971 | } |
e92b85e1 | 972 | |
e92b85e1 MH |
973 | return DWARF_CB_OK; |
974 | } | |
804b3606 | 975 | |
4ea42b18 | 976 | /* Search function from function name */ |
e92b85e1 | 977 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 978 | { |
b55a87ad MH |
979 | struct dwarf_callback_param *param = data; |
980 | struct probe_finder *pf = param->data; | |
4235b045 | 981 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 982 | |
e92b85e1 MH |
983 | /* Check tag and diename */ |
984 | if (dwarf_tag(sp_die) != DW_TAG_subprogram || | |
82175633 | 985 | !die_compare_name(sp_die, pp->function)) |
b55a87ad | 986 | return DWARF_CB_OK; |
e92b85e1 | 987 | |
7d21635a MH |
988 | /* Check declared file */ |
989 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
990 | return DWARF_CB_OK; | |
991 | ||
2a9c8c36 | 992 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 993 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
994 | dwarf_decl_line(sp_die, &pf->lno); |
995 | pf->lno += pp->line; | |
b55a87ad | 996 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
997 | } else if (!dwarf_func_inline(sp_die)) { |
998 | /* Real function */ | |
2a9c8c36 | 999 | if (pp->lazy_line) |
b55a87ad | 1000 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1001 | else { |
b55a87ad | 1002 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
0e43e5d2 MH |
1003 | pr_warning("Failed to get entry address of " |
1004 | "%s.\n", dwarf_diename(sp_die)); | |
b55a87ad MH |
1005 | param->retval = -ENOENT; |
1006 | return DWARF_CB_ABORT; | |
1007 | } | |
2a9c8c36 MH |
1008 | pf->addr += pp->offset; |
1009 | /* TODO: Check the address in this function */ | |
cf6eb489 | 1010 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 1011 | } |
b55a87ad MH |
1012 | } else { |
1013 | struct dwarf_callback_param _param = {.data = (void *)pf, | |
1014 | .retval = 0}; | |
e92b85e1 | 1015 | /* Inlined function: search instances */ |
b55a87ad MH |
1016 | dwarf_func_inline_instances(sp_die, probe_point_inline_cb, |
1017 | &_param); | |
1018 | param->retval = _param.retval; | |
1019 | } | |
e92b85e1 | 1020 | |
b55a87ad | 1021 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1022 | } |
1023 | ||
b55a87ad | 1024 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1025 | { |
b55a87ad MH |
1026 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1027 | .retval = 0}; | |
1028 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1029 | return _param.retval; | |
4ea42b18 MH |
1030 | } |
1031 | ||
cd25f8bc LM |
1032 | struct pubname_callback_param { |
1033 | char *function; | |
1034 | char *file; | |
1035 | Dwarf_Die *cu_die; | |
1036 | Dwarf_Die *sp_die; | |
1037 | int found; | |
1038 | }; | |
1039 | ||
1040 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
1041 | { | |
1042 | struct pubname_callback_param *param = data; | |
1043 | ||
1044 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1045 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1046 | return DWARF_CB_OK; | |
1047 | ||
1048 | if (die_compare_name(param->sp_die, param->function)) { | |
1049 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) | |
1050 | return DWARF_CB_OK; | |
1051 | ||
1052 | if (param->file && | |
1053 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1054 | return DWARF_CB_OK; | |
1055 | ||
1056 | param->found = 1; | |
1057 | return DWARF_CB_ABORT; | |
1058 | } | |
1059 | } | |
1060 | ||
1061 | return DWARF_CB_OK; | |
1062 | } | |
1063 | ||
cf6eb489 | 1064 | /* Find probe points from debuginfo */ |
ff741783 MH |
1065 | static int debuginfo__find_probes(struct debuginfo *self, |
1066 | struct probe_finder *pf) | |
4ea42b18 | 1067 | { |
cf6eb489 | 1068 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1069 | Dwarf_Off off, noff; |
1070 | size_t cuhl; | |
1071 | Dwarf_Die *diep; | |
b55a87ad | 1072 | int ret = 0; |
804b3606 | 1073 | |
7752f1b0 | 1074 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 1075 | /* Get the call frame information from this dwarf */ |
ff741783 | 1076 | pf->cfi = dwarf_getcfi(self->dbg); |
7752f1b0 | 1077 | #endif |
a34a9854 | 1078 | |
804b3606 | 1079 | off = 0; |
cf6eb489 | 1080 | line_list__init(&pf->lcache); |
cd25f8bc LM |
1081 | |
1082 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
1083 | if (pp->function) { | |
1084 | struct pubname_callback_param pubname_param = { | |
1085 | .function = pp->function, | |
1086 | .file = pp->file, | |
1087 | .cu_die = &pf->cu_die, | |
1088 | .sp_die = &pf->sp_die, | |
2b348a77 | 1089 | .found = 0, |
cd25f8bc LM |
1090 | }; |
1091 | struct dwarf_callback_param probe_param = { | |
1092 | .data = pf, | |
1093 | }; | |
1094 | ||
ff741783 MH |
1095 | dwarf_getpubnames(self->dbg, pubname_search_cb, |
1096 | &pubname_param, 0); | |
cd25f8bc LM |
1097 | if (pubname_param.found) { |
1098 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1099 | if (ret) | |
1100 | goto found; | |
1101 | } | |
1102 | } | |
1103 | ||
804b3606 | 1104 | /* Loop on CUs (Compilation Unit) */ |
ff741783 | 1105 | while (!dwarf_nextcu(self->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1106 | /* Get the DIE(Debugging Information Entry) of this CU */ |
ff741783 | 1107 | diep = dwarf_offdie(self->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1108 | if (!diep) |
1109 | continue; | |
4ea42b18 MH |
1110 | |
1111 | /* Check if target file is included. */ | |
1112 | if (pp->file) | |
cf6eb489 | 1113 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1114 | else |
cf6eb489 | 1115 | pf->fname = NULL; |
4ea42b18 | 1116 | |
cf6eb489 | 1117 | if (!pp->file || pf->fname) { |
4ea42b18 | 1118 | if (pp->function) |
cf6eb489 | 1119 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1120 | else if (pp->lazy_line) |
cf6eb489 | 1121 | ret = find_probe_point_lazy(NULL, pf); |
b0ef0732 | 1122 | else { |
cf6eb489 MH |
1123 | pf->lno = pp->line; |
1124 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1125 | } |
8635bf6e | 1126 | if (ret < 0) |
fbee632d | 1127 | break; |
4ea42b18 | 1128 | } |
804b3606 | 1129 | off = noff; |
4ea42b18 | 1130 | } |
cd25f8bc LM |
1131 | |
1132 | found: | |
cf6eb489 | 1133 | line_list__free(&pf->lcache); |
4ea42b18 | 1134 | |
cf6eb489 MH |
1135 | return ret; |
1136 | } | |
1137 | ||
1138 | /* Add a found probe point into trace event list */ | |
221d0611 | 1139 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1140 | { |
1141 | struct trace_event_finder *tf = | |
1142 | container_of(pf, struct trace_event_finder, pf); | |
1143 | struct probe_trace_event *tev; | |
1144 | int ret, i; | |
1145 | ||
1146 | /* Check number of tevs */ | |
1147 | if (tf->ntevs == tf->max_tevs) { | |
1148 | pr_warning("Too many( > %d) probe point found.\n", | |
1149 | tf->max_tevs); | |
1150 | return -ERANGE; | |
1151 | } | |
1152 | tev = &tf->tevs[tf->ntevs++]; | |
1153 | ||
221d0611 MH |
1154 | /* Trace point should be converted from subprogram DIE */ |
1155 | ret = convert_to_trace_point(&pf->sp_die, pf->addr, | |
1156 | pf->pev->point.retprobe, &tev->point); | |
cf6eb489 MH |
1157 | if (ret < 0) |
1158 | return ret; | |
1159 | ||
1160 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, | |
1161 | tev->point.offset); | |
1162 | ||
1163 | /* Find each argument */ | |
1164 | tev->nargs = pf->pev->nargs; | |
1165 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1166 | if (tev->args == NULL) | |
1167 | return -ENOMEM; | |
1168 | for (i = 0; i < pf->pev->nargs; i++) { | |
1169 | pf->pvar = &pf->pev->args[i]; | |
1170 | pf->tvar = &tev->args[i]; | |
221d0611 MH |
1171 | /* Variable should be found from scope DIE */ |
1172 | ret = find_variable(sc_die, pf); | |
cf6eb489 MH |
1173 | if (ret != 0) |
1174 | return ret; | |
1175 | } | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
ff741783 MH |
1181 | int debuginfo__find_trace_events(struct debuginfo *self, |
1182 | struct perf_probe_event *pev, | |
1183 | struct probe_trace_event **tevs, int max_tevs) | |
cf6eb489 MH |
1184 | { |
1185 | struct trace_event_finder tf = { | |
1186 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
1187 | .max_tevs = max_tevs}; | |
1188 | int ret; | |
1189 | ||
1190 | /* Allocate result tevs array */ | |
1191 | *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); | |
1192 | if (*tevs == NULL) | |
1193 | return -ENOMEM; | |
1194 | ||
1195 | tf.tevs = *tevs; | |
1196 | tf.ntevs = 0; | |
1197 | ||
ff741783 | 1198 | ret = debuginfo__find_probes(self, &tf.pf); |
cf6eb489 MH |
1199 | if (ret < 0) { |
1200 | free(*tevs); | |
1201 | *tevs = NULL; | |
1202 | return ret; | |
1203 | } | |
1204 | ||
1205 | return (ret < 0) ? ret : tf.ntevs; | |
1206 | } | |
1207 | ||
1208 | #define MAX_VAR_LEN 64 | |
1209 | ||
1210 | /* Collect available variables in this scope */ | |
1211 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1212 | { | |
1213 | struct available_var_finder *af = data; | |
1214 | struct variable_list *vl; | |
1215 | char buf[MAX_VAR_LEN]; | |
1216 | int tag, ret; | |
1217 | ||
1218 | vl = &af->vls[af->nvls - 1]; | |
1219 | ||
1220 | tag = dwarf_tag(die_mem); | |
1221 | if (tag == DW_TAG_formal_parameter || | |
1222 | tag == DW_TAG_variable) { | |
1223 | ret = convert_variable_location(die_mem, af->pf.addr, | |
1224 | af->pf.fb_ops, NULL); | |
1225 | if (ret == 0) { | |
1226 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); | |
fb8c5a56 | 1227 | pr_debug2("Add new var: %s\n", buf); |
cf6eb489 MH |
1228 | if (ret > 0) |
1229 | strlist__add(vl->vars, buf); | |
1230 | } | |
1231 | } | |
1232 | ||
fb8c5a56 | 1233 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1234 | return DIE_FIND_CB_CONTINUE; |
1235 | else | |
1236 | return DIE_FIND_CB_SIBLING; | |
1237 | } | |
1238 | ||
1239 | /* Add a found vars into available variables list */ | |
221d0611 | 1240 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1241 | { |
1242 | struct available_var_finder *af = | |
1243 | container_of(pf, struct available_var_finder, pf); | |
1244 | struct variable_list *vl; | |
fb8c5a56 MH |
1245 | Dwarf_Die die_mem, *scopes = NULL; |
1246 | int ret, nscopes; | |
cf6eb489 MH |
1247 | |
1248 | /* Check number of tevs */ | |
1249 | if (af->nvls == af->max_vls) { | |
1250 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1251 | return -ERANGE; | |
1252 | } | |
1253 | vl = &af->vls[af->nvls++]; | |
1254 | ||
221d0611 MH |
1255 | /* Trace point should be converted from subprogram DIE */ |
1256 | ret = convert_to_trace_point(&pf->sp_die, pf->addr, | |
1257 | pf->pev->point.retprobe, &vl->point); | |
cf6eb489 MH |
1258 | if (ret < 0) |
1259 | return ret; | |
1260 | ||
1261 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1262 | vl->point.offset); | |
1263 | ||
1264 | /* Find local variables */ | |
1265 | vl->vars = strlist__new(true, NULL); | |
1266 | if (vl->vars == NULL) | |
1267 | return -ENOMEM; | |
fb8c5a56 | 1268 | af->child = true; |
221d0611 | 1269 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1270 | |
fb8c5a56 MH |
1271 | /* Find external variables */ |
1272 | if (!af->externs) | |
1273 | goto out; | |
1274 | /* Don't need to search child DIE for externs. */ | |
1275 | af->child = false; | |
221d0611 | 1276 | nscopes = dwarf_getscopes_die(sc_die, &scopes); |
fb8c5a56 MH |
1277 | while (nscopes-- > 1) |
1278 | die_find_child(&scopes[nscopes], collect_variables_cb, | |
1279 | (void *)af, &die_mem); | |
1280 | if (scopes) | |
1281 | free(scopes); | |
1282 | ||
1283 | out: | |
cf6eb489 MH |
1284 | if (strlist__empty(vl->vars)) { |
1285 | strlist__delete(vl->vars); | |
1286 | vl->vars = NULL; | |
1287 | } | |
1288 | ||
1289 | return ret; | |
1290 | } | |
1291 | ||
1292 | /* Find available variables at given probe point */ | |
ff741783 MH |
1293 | int debuginfo__find_available_vars_at(struct debuginfo *self, |
1294 | struct perf_probe_event *pev, | |
1295 | struct variable_list **vls, | |
1296 | int max_vls, bool externs) | |
cf6eb489 MH |
1297 | { |
1298 | struct available_var_finder af = { | |
1299 | .pf = {.pev = pev, .callback = add_available_vars}, | |
fb8c5a56 | 1300 | .max_vls = max_vls, .externs = externs}; |
cf6eb489 MH |
1301 | int ret; |
1302 | ||
1303 | /* Allocate result vls array */ | |
1304 | *vls = zalloc(sizeof(struct variable_list) * max_vls); | |
1305 | if (*vls == NULL) | |
1306 | return -ENOMEM; | |
1307 | ||
1308 | af.vls = *vls; | |
1309 | af.nvls = 0; | |
1310 | ||
ff741783 | 1311 | ret = debuginfo__find_probes(self, &af.pf); |
cf6eb489 MH |
1312 | if (ret < 0) { |
1313 | /* Free vlist for error */ | |
1314 | while (af.nvls--) { | |
1315 | if (af.vls[af.nvls].point.symbol) | |
1316 | free(af.vls[af.nvls].point.symbol); | |
1317 | if (af.vls[af.nvls].vars) | |
1318 | strlist__delete(af.vls[af.nvls].vars); | |
1319 | } | |
1320 | free(af.vls); | |
1321 | *vls = NULL; | |
1322 | return ret; | |
1323 | } | |
1324 | ||
1325 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1326 | } |
1327 | ||
fb1587d8 | 1328 | /* Reverse search */ |
ff741783 MH |
1329 | int debuginfo__find_probe_point(struct debuginfo *self, unsigned long addr, |
1330 | struct perf_probe_point *ppt) | |
fb1587d8 MH |
1331 | { |
1332 | Dwarf_Die cudie, spdie, indie; | |
ff741783 | 1333 | Dwarf_Addr _addr, baseaddr; |
1d46ea2a MH |
1334 | const char *fname = NULL, *func = NULL, *tmp; |
1335 | int baseline = 0, lineno = 0, ret = 0; | |
fb1587d8 | 1336 | |
469b9b88 | 1337 | /* Adjust address with bias */ |
ff741783 MH |
1338 | addr += self->bias; |
1339 | ||
fb1587d8 | 1340 | /* Find cu die */ |
ff741783 | 1341 | if (!dwarf_addrdie(self->dbg, (Dwarf_Addr)addr - self->bias, &cudie)) { |
0e43e5d2 MH |
1342 | pr_warning("Failed to find debug information for address %lx\n", |
1343 | addr); | |
75ec5a24 MH |
1344 | ret = -EINVAL; |
1345 | goto end; | |
1346 | } | |
fb1587d8 | 1347 | |
1d46ea2a MH |
1348 | /* Find a corresponding line (filename and lineno) */ |
1349 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1350 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1351 | |
1d46ea2a | 1352 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1353 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1354 | /* Get function entry information */ |
fb1587d8 | 1355 | tmp = dwarf_diename(&spdie); |
1d46ea2a MH |
1356 | if (!tmp || |
1357 | dwarf_entrypc(&spdie, &baseaddr) != 0 || | |
1358 | dwarf_decl_line(&spdie, &baseline) != 0) | |
1359 | goto post; | |
1360 | func = tmp; | |
1361 | ||
1362 | if (addr == (unsigned long)baseaddr) | |
1363 | /* Function entry - Relative line number is 0 */ | |
1364 | lineno = baseline; | |
1365 | else if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1366 | &indie)) { | |
1367 | if (dwarf_entrypc(&indie, &_addr) == 0 && | |
1368 | _addr == addr) | |
1369 | /* | |
1370 | * addr is at an inline function entry. | |
1371 | * In this case, lineno should be the call-site | |
1372 | * line number. | |
1373 | */ | |
1374 | lineno = die_get_call_lineno(&indie); | |
1375 | else { | |
1376 | /* | |
1377 | * addr is in an inline function body. | |
1378 | * Since lineno points one of the lines | |
1379 | * of the inline function, baseline should | |
1380 | * be the entry line of the inline function. | |
1381 | */ | |
b55a87ad | 1382 | tmp = dwarf_diename(&indie); |
1d46ea2a MH |
1383 | if (tmp && |
1384 | dwarf_decl_line(&spdie, &baseline) == 0) | |
1385 | func = tmp; | |
b55a87ad | 1386 | } |
fb1587d8 | 1387 | } |
1d46ea2a MH |
1388 | } |
1389 | ||
1390 | post: | |
1391 | /* Make a relative line number or an offset */ | |
1392 | if (lineno) | |
1393 | ppt->line = lineno - baseline; | |
1394 | else if (func) | |
1395 | ppt->offset = addr - (unsigned long)baseaddr; | |
1396 | ||
1397 | /* Duplicate strings */ | |
1398 | if (func) { | |
1399 | ppt->function = strdup(func); | |
02b95dad MH |
1400 | if (ppt->function == NULL) { |
1401 | ret = -ENOMEM; | |
1402 | goto end; | |
1403 | } | |
fb1587d8 | 1404 | } |
1d46ea2a MH |
1405 | if (fname) { |
1406 | ppt->file = strdup(fname); | |
1407 | if (ppt->file == NULL) { | |
1408 | if (ppt->function) { | |
1409 | free(ppt->function); | |
1410 | ppt->function = NULL; | |
1411 | } | |
1412 | ret = -ENOMEM; | |
1413 | goto end; | |
1414 | } | |
1415 | } | |
fb1587d8 | 1416 | end: |
1d46ea2a MH |
1417 | if (ret == 0 && (fname || func)) |
1418 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1419 | return ret; |
1420 | } | |
1421 | ||
f6c903f5 MH |
1422 | /* Add a line and store the src path */ |
1423 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1424 | struct line_range *lr) | |
1425 | { | |
7cf0b79e | 1426 | /* Copy source path */ |
f6c903f5 | 1427 | if (!lr->path) { |
7cf0b79e MH |
1428 | lr->path = strdup(src); |
1429 | if (lr->path == NULL) | |
1430 | return -ENOMEM; | |
f6c903f5 MH |
1431 | } |
1432 | return line_list__add_line(&lr->line_list, lineno); | |
1433 | } | |
1434 | ||
4cc9cec6 MH |
1435 | static int line_range_walk_cb(const char *fname, int lineno, |
1436 | Dwarf_Addr addr __used, | |
1437 | void *data) | |
f6c903f5 | 1438 | { |
4cc9cec6 | 1439 | struct line_finder *lf = data; |
f6c903f5 | 1440 | |
4cc9cec6 | 1441 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1442 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1443 | return 0; |
f6c903f5 | 1444 | |
4cc9cec6 MH |
1445 | if (line_range_add_line(fname, lineno, lf->lr) < 0) |
1446 | return -EINVAL; | |
f6c903f5 | 1447 | |
4cc9cec6 | 1448 | return 0; |
f6c903f5 | 1449 | } |
fb1587d8 | 1450 | |
631c9def | 1451 | /* Find line range from its line number */ |
b55a87ad | 1452 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1453 | { |
4cc9cec6 | 1454 | int ret; |
f6c903f5 | 1455 | |
4cc9cec6 | 1456 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1457 | |
804b3606 | 1458 | /* Update status */ |
f6c903f5 MH |
1459 | if (ret >= 0) |
1460 | if (!list_empty(&lf->lr->line_list)) | |
1461 | ret = lf->found = 1; | |
1462 | else | |
1463 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1464 | else { |
1465 | free(lf->lr->path); | |
1466 | lf->lr->path = NULL; | |
1467 | } | |
f6c903f5 | 1468 | return ret; |
631c9def MH |
1469 | } |
1470 | ||
161a26b0 MH |
1471 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1472 | { | |
b55a87ad MH |
1473 | struct dwarf_callback_param *param = data; |
1474 | ||
1475 | param->retval = find_line_range_by_line(in_die, param->data); | |
36c0c588 MH |
1476 | |
1477 | /* | |
1478 | * We have to check all instances of inlined function, because | |
1479 | * some execution paths can be optimized out depends on the | |
1480 | * function argument of instances | |
1481 | */ | |
1482 | return DWARF_CB_OK; | |
161a26b0 MH |
1483 | } |
1484 | ||
631c9def | 1485 | /* Search function from function name */ |
e92b85e1 | 1486 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1487 | { |
b55a87ad MH |
1488 | struct dwarf_callback_param *param = data; |
1489 | struct line_finder *lf = param->data; | |
631c9def | 1490 | struct line_range *lr = lf->lr; |
631c9def | 1491 | |
7d21635a MH |
1492 | /* Check declared file */ |
1493 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1494 | return DWARF_CB_OK; | |
1495 | ||
e92b85e1 | 1496 | if (dwarf_tag(sp_die) == DW_TAG_subprogram && |
82175633 | 1497 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1498 | lf->fname = dwarf_decl_file(sp_die); |
1499 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1500 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1501 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1502 | if (lf->lno_s < 0) /* Overflow */ |
1503 | lf->lno_s = INT_MAX; | |
1504 | lf->lno_e = lr->offset + lr->end; | |
1505 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1506 | lf->lno_e = INT_MAX; |
d3b63d7a | 1507 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1508 | lr->start = lf->lno_s; |
1509 | lr->end = lf->lno_e; | |
b55a87ad MH |
1510 | if (dwarf_func_inline(sp_die)) { |
1511 | struct dwarf_callback_param _param; | |
1512 | _param.data = (void *)lf; | |
1513 | _param.retval = 0; | |
161a26b0 | 1514 | dwarf_func_inline_instances(sp_die, |
b55a87ad MH |
1515 | line_range_inline_cb, |
1516 | &_param); | |
1517 | param->retval = _param.retval; | |
1518 | } else | |
1519 | param->retval = find_line_range_by_line(sp_die, lf); | |
1520 | return DWARF_CB_ABORT; | |
631c9def | 1521 | } |
b55a87ad | 1522 | return DWARF_CB_OK; |
631c9def MH |
1523 | } |
1524 | ||
b55a87ad | 1525 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1526 | { |
b55a87ad MH |
1527 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1528 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1529 | return param.retval; | |
631c9def MH |
1530 | } |
1531 | ||
ff741783 | 1532 | int debuginfo__find_line_range(struct debuginfo *self, struct line_range *lr) |
631c9def | 1533 | { |
804b3606 | 1534 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1535 | int ret = 0; |
804b3606 MH |
1536 | Dwarf_Off off = 0, noff; |
1537 | size_t cuhl; | |
1538 | Dwarf_Die *diep; | |
6a330a3c | 1539 | const char *comp_dir; |
804b3606 | 1540 | |
cd25f8bc LM |
1541 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1542 | if (lr->function) { | |
1543 | struct pubname_callback_param pubname_param = { | |
1544 | .function = lr->function, .file = lr->file, | |
1545 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1546 | struct dwarf_callback_param line_range_param = { | |
1547 | .data = (void *)&lf, .retval = 0}; | |
1548 | ||
ff741783 MH |
1549 | dwarf_getpubnames(self->dbg, pubname_search_cb, |
1550 | &pubname_param, 0); | |
cd25f8bc LM |
1551 | if (pubname_param.found) { |
1552 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1553 | if (lf.found) | |
1554 | goto found; | |
1555 | } | |
1556 | } | |
1557 | ||
804b3606 | 1558 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1559 | while (!lf.found && ret >= 0) { |
ff741783 MH |
1560 | if (dwarf_nextcu(self->dbg, off, &noff, &cuhl, |
1561 | NULL, NULL, NULL) != 0) | |
631c9def MH |
1562 | break; |
1563 | ||
1564 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
ff741783 | 1565 | diep = dwarf_offdie(self->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1566 | if (!diep) |
1567 | continue; | |
631c9def MH |
1568 | |
1569 | /* Check if target file is included. */ | |
1570 | if (lr->file) | |
2a9c8c36 | 1571 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1572 | else |
2a9c8c36 | 1573 | lf.fname = 0; |
631c9def | 1574 | |
2a9c8c36 | 1575 | if (!lr->file || lf.fname) { |
631c9def | 1576 | if (lr->function) |
b55a87ad | 1577 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1578 | else { |
1579 | lf.lno_s = lr->start; | |
d3b63d7a | 1580 | lf.lno_e = lr->end; |
b55a87ad | 1581 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1582 | } |
631c9def | 1583 | } |
804b3606 | 1584 | off = noff; |
631c9def | 1585 | } |
6a330a3c | 1586 | |
cd25f8bc | 1587 | found: |
6a330a3c MH |
1588 | /* Store comp_dir */ |
1589 | if (lf.found) { | |
1590 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1591 | if (comp_dir) { | |
1592 | lr->comp_dir = strdup(comp_dir); | |
1593 | if (!lr->comp_dir) | |
1594 | ret = -ENOMEM; | |
1595 | } | |
1596 | } | |
1597 | ||
7cf0b79e | 1598 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1599 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1600 | } |
1601 |