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