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TOMOYO Linux Cross Reference
Linux/tools/perf/util/annotate.c

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  1 /*
  2  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
  3  *
  4  * Parts came from builtin-annotate.c, see those files for further
  5  * copyright notes.
  6  *
  7  * Released under the GPL v2. (and only v2, not any later version)
  8  */
  9 
 10 #include "util.h"
 11 #include "build-id.h"
 12 #include "color.h"
 13 #include "cache.h"
 14 #include "symbol.h"
 15 #include "debug.h"
 16 #include "annotate.h"
 17 #include <pthread.h>
 18 
 19 int symbol__annotate_init(struct map *map __used, struct symbol *sym)
 20 {
 21         struct annotation *notes = symbol__annotation(sym);
 22         pthread_mutex_init(&notes->lock, NULL);
 23         return 0;
 24 }
 25 
 26 int symbol__alloc_hist(struct symbol *sym, int nevents)
 27 {
 28         struct annotation *notes = symbol__annotation(sym);
 29         size_t sizeof_sym_hist = (sizeof(struct sym_hist) +
 30                                   (sym->end - sym->start) * sizeof(u64));
 31 
 32         notes->src = zalloc(sizeof(*notes->src) + nevents * sizeof_sym_hist);
 33         if (notes->src == NULL)
 34                 return -1;
 35         notes->src->sizeof_sym_hist = sizeof_sym_hist;
 36         notes->src->nr_histograms   = nevents;
 37         INIT_LIST_HEAD(&notes->src->source);
 38         return 0;
 39 }
 40 
 41 void symbol__annotate_zero_histograms(struct symbol *sym)
 42 {
 43         struct annotation *notes = symbol__annotation(sym);
 44 
 45         pthread_mutex_lock(&notes->lock);
 46         if (notes->src != NULL)
 47                 memset(notes->src->histograms, 0,
 48                        notes->src->nr_histograms * notes->src->sizeof_sym_hist);
 49         pthread_mutex_unlock(&notes->lock);
 50 }
 51 
 52 int symbol__inc_addr_samples(struct symbol *sym, struct map *map,
 53                              int evidx, u64 addr)
 54 {
 55         unsigned offset;
 56         struct annotation *notes;
 57         struct sym_hist *h;
 58 
 59         notes = symbol__annotation(sym);
 60         if (notes->src == NULL)
 61                 return -ENOMEM;
 62 
 63         pr_debug3("%s: addr=%#" PRIx64 "\n", __func__, map->unmap_ip(map, addr));
 64 
 65         if (addr >= sym->end)
 66                 return 0;
 67 
 68         offset = addr - sym->start;
 69         h = annotation__histogram(notes, evidx);
 70         h->sum++;
 71         h->addr[offset]++;
 72 
 73         pr_debug3("%#" PRIx64 " %s: period++ [addr: %#" PRIx64 ", %#" PRIx64
 74                   ", evidx=%d] => %" PRIu64 "\n", sym->start, sym->name,
 75                   addr, addr - sym->start, evidx, h->addr[offset]);
 76         return 0;
 77 }
 78 
 79 static struct objdump_line *objdump_line__new(s64 offset, char *line, size_t privsize)
 80 {
 81         struct objdump_line *self = malloc(sizeof(*self) + privsize);
 82 
 83         if (self != NULL) {
 84                 self->offset = offset;
 85                 self->line = line;
 86         }
 87 
 88         return self;
 89 }
 90 
 91 void objdump_line__free(struct objdump_line *self)
 92 {
 93         free(self->line);
 94         free(self);
 95 }
 96 
 97 static void objdump__add_line(struct list_head *head, struct objdump_line *line)
 98 {
 99         list_add_tail(&line->node, head);
100 }
101 
102 struct objdump_line *objdump__get_next_ip_line(struct list_head *head,
103                                                struct objdump_line *pos)
104 {
105         list_for_each_entry_continue(pos, head, node)
106                 if (pos->offset >= 0)
107                         return pos;
108 
109         return NULL;
110 }
111 
112 static int objdump_line__print(struct objdump_line *oline, struct symbol *sym,
113                                int evidx, u64 len, int min_pcnt,
114                                int printed, int max_lines,
115                                struct objdump_line *queue)
116 {
117         static const char *prev_line;
118         static const char *prev_color;
119 
120         if (oline->offset != -1) {
121                 const char *path = NULL;
122                 unsigned int hits = 0;
123                 double percent = 0.0;
124                 const char *color;
125                 struct annotation *notes = symbol__annotation(sym);
126                 struct source_line *src_line = notes->src->lines;
127                 struct sym_hist *h = annotation__histogram(notes, evidx);
128                 s64 offset = oline->offset;
129                 struct objdump_line *next;
130 
131                 next = objdump__get_next_ip_line(&notes->src->source, oline);
132 
133                 while (offset < (s64)len &&
134                        (next == NULL || offset < next->offset)) {
135                         if (src_line) {
136                                 if (path == NULL)
137                                         path = src_line[offset].path;
138                                 percent += src_line[offset].percent;
139                         } else
140                                 hits += h->addr[offset];
141 
142                         ++offset;
143                 }
144 
145                 if (src_line == NULL && h->sum)
146                         percent = 100.0 * hits / h->sum;
147 
148                 if (percent < min_pcnt)
149                         return -1;
150 
151                 if (max_lines && printed >= max_lines)
152                         return 1;
153 
154                 if (queue != NULL) {
155                         list_for_each_entry_from(queue, &notes->src->source, node) {
156                                 if (queue == oline)
157                                         break;
158                                 objdump_line__print(queue, sym, evidx, len,
159                                                     0, 0, 1, NULL);
160                         }
161                 }
162 
163                 color = get_percent_color(percent);
164 
165                 /*
166                  * Also color the filename and line if needed, with
167                  * the same color than the percentage. Don't print it
168                  * twice for close colored addr with the same filename:line
169                  */
170                 if (path) {
171                         if (!prev_line || strcmp(prev_line, path)
172                                        || color != prev_color) {
173                                 color_fprintf(stdout, color, " %s", path);
174                                 prev_line = path;
175                                 prev_color = color;
176                         }
177                 }
178 
179                 color_fprintf(stdout, color, " %7.2f", percent);
180                 printf(" :      ");
181                 color_fprintf(stdout, PERF_COLOR_BLUE, "%s\n", oline->line);
182         } else if (max_lines && printed >= max_lines)
183                 return 1;
184         else {
185                 if (queue)
186                         return -1;
187 
188                 if (!*oline->line)
189                         printf("         :\n");
190                 else
191                         printf("         :      %s\n", oline->line);
192         }
193 
194         return 0;
195 }
196 
197 static int symbol__parse_objdump_line(struct symbol *sym, struct map *map,
198                                       FILE *file, size_t privsize)
199 {
200         struct annotation *notes = symbol__annotation(sym);
201         struct objdump_line *objdump_line;
202         char *line = NULL, *tmp, *tmp2, *c;
203         size_t line_len;
204         s64 line_ip, offset = -1;
205 
206         if (getline(&line, &line_len, file) < 0)
207                 return -1;
208 
209         if (!line)
210                 return -1;
211 
212         while (line_len != 0 && isspace(line[line_len - 1]))
213                 line[--line_len] = '\0';
214 
215         c = strchr(line, '\n');
216         if (c)
217                 *c = 0;
218 
219         line_ip = -1;
220 
221         /*
222          * Strip leading spaces:
223          */
224         tmp = line;
225         while (*tmp) {
226                 if (*tmp != ' ')
227                         break;
228                 tmp++;
229         }
230 
231         if (*tmp) {
232                 /*
233                  * Parse hexa addresses followed by ':'
234                  */
235                 line_ip = strtoull(tmp, &tmp2, 16);
236                 if (*tmp2 != ':' || tmp == tmp2 || tmp2[1] == '\0')
237                         line_ip = -1;
238         }
239 
240         if (line_ip != -1) {
241                 u64 start = map__rip_2objdump(map, sym->start),
242                     end = map__rip_2objdump(map, sym->end);
243 
244                 offset = line_ip - start;
245                 if (offset < 0 || (u64)line_ip > end)
246                         offset = -1;
247         }
248 
249         objdump_line = objdump_line__new(offset, line, privsize);
250         if (objdump_line == NULL) {
251                 free(line);
252                 return -1;
253         }
254         objdump__add_line(&notes->src->source, objdump_line);
255 
256         return 0;
257 }
258 
259 int symbol__annotate(struct symbol *sym, struct map *map, size_t privsize)
260 {
261         struct dso *dso = map->dso;
262         char *filename = dso__build_id_filename(dso, NULL, 0);
263         bool free_filename = true;
264         char command[PATH_MAX * 2];
265         FILE *file;
266         int err = 0;
267         char symfs_filename[PATH_MAX];
268 
269         if (filename) {
270                 snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
271                          symbol_conf.symfs, filename);
272         }
273 
274         if (filename == NULL) {
275                 if (dso->has_build_id) {
276                         pr_err("Can't annotate %s: not enough memory\n",
277                                sym->name);
278                         return -ENOMEM;
279                 }
280                 goto fallback;
281         } else if (readlink(symfs_filename, command, sizeof(command)) < 0 ||
282                    strstr(command, "[kernel.kallsyms]") ||
283                    access(symfs_filename, R_OK)) {
284                 free(filename);
285 fallback:
286                 /*
287                  * If we don't have build-ids or the build-id file isn't in the
288                  * cache, or is just a kallsyms file, well, lets hope that this
289                  * DSO is the same as when 'perf record' ran.
290                  */
291                 filename = dso->long_name;
292                 snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
293                          symbol_conf.symfs, filename);
294                 free_filename = false;
295         }
296 
297         if (dso->symtab_type == SYMTAB__KALLSYMS) {
298                 char bf[BUILD_ID_SIZE * 2 + 16] = " with build id ";
299                 char *build_id_msg = NULL;
300 
301                 if (dso->annotate_warned)
302                         goto out_free_filename;
303 
304                 if (dso->has_build_id) {
305                         build_id__sprintf(dso->build_id,
306                                           sizeof(dso->build_id), bf + 15);
307                         build_id_msg = bf;
308                 }
309                 err = -ENOENT;
310                 dso->annotate_warned = 1;
311                 pr_err("Can't annotate %s: No vmlinux file%s was found in the "
312                        "path.\nPlease use 'perf buildid-cache -av vmlinux' or "
313                        "--vmlinux vmlinux.\n",
314                        sym->name, build_id_msg ?: "");
315                 goto out_free_filename;
316         }
317 
318         pr_debug("%s: filename=%s, sym=%s, start=%#" PRIx64 ", end=%#" PRIx64 "\n", __func__,
319                  filename, sym->name, map->unmap_ip(map, sym->start),
320                  map->unmap_ip(map, sym->end));
321 
322         pr_debug("annotating [%p] %30s : [%p] %30s\n",
323                  dso, dso->long_name, sym, sym->name);
324 
325         snprintf(command, sizeof(command),
326                  "objdump --start-address=0x%016" PRIx64
327                  " --stop-address=0x%016" PRIx64 " -dS -C %s|grep -v %s|expand",
328                  map__rip_2objdump(map, sym->start),
329                  map__rip_2objdump(map, sym->end),
330                  symfs_filename, filename);
331 
332         pr_debug("Executing: %s\n", command);
333 
334         file = popen(command, "r");
335         if (!file)
336                 goto out_free_filename;
337 
338         while (!feof(file))
339                 if (symbol__parse_objdump_line(sym, map, file, privsize) < 0)
340                         break;
341 
342         pclose(file);
343 out_free_filename:
344         if (free_filename)
345                 free(filename);
346         return err;
347 }
348 
349 static void insert_source_line(struct rb_root *root, struct source_line *src_line)
350 {
351         struct source_line *iter;
352         struct rb_node **p = &root->rb_node;
353         struct rb_node *parent = NULL;
354 
355         while (*p != NULL) {
356                 parent = *p;
357                 iter = rb_entry(parent, struct source_line, node);
358 
359                 if (src_line->percent > iter->percent)
360                         p = &(*p)->rb_left;
361                 else
362                         p = &(*p)->rb_right;
363         }
364 
365         rb_link_node(&src_line->node, parent, p);
366         rb_insert_color(&src_line->node, root);
367 }
368 
369 static void symbol__free_source_line(struct symbol *sym, int len)
370 {
371         struct annotation *notes = symbol__annotation(sym);
372         struct source_line *src_line = notes->src->lines;
373         int i;
374 
375         for (i = 0; i < len; i++)
376                 free(src_line[i].path);
377 
378         free(src_line);
379         notes->src->lines = NULL;
380 }
381 
382 /* Get the filename:line for the colored entries */
383 static int symbol__get_source_line(struct symbol *sym, struct map *map,
384                                    int evidx, struct rb_root *root, int len,
385                                    const char *filename)
386 {
387         u64 start;
388         int i;
389         char cmd[PATH_MAX * 2];
390         struct source_line *src_line;
391         struct annotation *notes = symbol__annotation(sym);
392         struct sym_hist *h = annotation__histogram(notes, evidx);
393 
394         if (!h->sum)
395                 return 0;
396 
397         src_line = notes->src->lines = calloc(len, sizeof(struct source_line));
398         if (!notes->src->lines)
399                 return -1;
400 
401         start = map->unmap_ip(map, sym->start);
402 
403         for (i = 0; i < len; i++) {
404                 char *path = NULL;
405                 size_t line_len;
406                 u64 offset;
407                 FILE *fp;
408 
409                 src_line[i].percent = 100.0 * h->addr[i] / h->sum;
410                 if (src_line[i].percent <= 0.5)
411                         continue;
412 
413                 offset = start + i;
414                 sprintf(cmd, "addr2line -e %s %016" PRIx64, filename, offset);
415                 fp = popen(cmd, "r");
416                 if (!fp)
417                         continue;
418 
419                 if (getline(&path, &line_len, fp) < 0 || !line_len)
420                         goto next;
421 
422                 src_line[i].path = malloc(sizeof(char) * line_len + 1);
423                 if (!src_line[i].path)
424                         goto next;
425 
426                 strcpy(src_line[i].path, path);
427                 insert_source_line(root, &src_line[i]);
428 
429         next:
430                 pclose(fp);
431         }
432 
433         return 0;
434 }
435 
436 static void print_summary(struct rb_root *root, const char *filename)
437 {
438         struct source_line *src_line;
439         struct rb_node *node;
440 
441         printf("\nSorted summary for file %s\n", filename);
442         printf("----------------------------------------------\n\n");
443 
444         if (RB_EMPTY_ROOT(root)) {
445                 printf(" Nothing higher than %1.1f%%\n", MIN_GREEN);
446                 return;
447         }
448 
449         node = rb_first(root);
450         while (node) {
451                 double percent;
452                 const char *color;
453                 char *path;
454 
455                 src_line = rb_entry(node, struct source_line, node);
456                 percent = src_line->percent;
457                 color = get_percent_color(percent);
458                 path = src_line->path;
459 
460                 color_fprintf(stdout, color, " %7.2f %s", percent, path);
461                 node = rb_next(node);
462         }
463 }
464 
465 static void symbol__annotate_hits(struct symbol *sym, int evidx)
466 {
467         struct annotation *notes = symbol__annotation(sym);
468         struct sym_hist *h = annotation__histogram(notes, evidx);
469         u64 len = sym->end - sym->start, offset;
470 
471         for (offset = 0; offset < len; ++offset)
472                 if (h->addr[offset] != 0)
473                         printf("%*" PRIx64 ": %" PRIu64 "\n", BITS_PER_LONG / 2,
474                                sym->start + offset, h->addr[offset]);
475         printf("%*s: %" PRIu64 "\n", BITS_PER_LONG / 2, "h->sum", h->sum);
476 }
477 
478 int symbol__annotate_printf(struct symbol *sym, struct map *map, int evidx,
479                             bool full_paths, int min_pcnt, int max_lines,
480                             int context)
481 {
482         struct dso *dso = map->dso;
483         const char *filename = dso->long_name, *d_filename;
484         struct annotation *notes = symbol__annotation(sym);
485         struct objdump_line *pos, *queue = NULL;
486         int printed = 2, queue_len = 0;
487         int more = 0;
488         u64 len;
489 
490         if (full_paths)
491                 d_filename = filename;
492         else
493                 d_filename = basename(filename);
494 
495         len = sym->end - sym->start;
496 
497         printf(" Percent |      Source code & Disassembly of %s\n", d_filename);
498         printf("------------------------------------------------\n");
499 
500         if (verbose)
501                 symbol__annotate_hits(sym, evidx);
502 
503         list_for_each_entry(pos, &notes->src->source, node) {
504                 if (context && queue == NULL) {
505                         queue = pos;
506                         queue_len = 0;
507                 }
508 
509                 switch (objdump_line__print(pos, sym, evidx, len, min_pcnt,
510                                             printed, max_lines, queue)) {
511                 case 0:
512                         ++printed;
513                         if (context) {
514                                 printed += queue_len;
515                                 queue = NULL;
516                                 queue_len = 0;
517                         }
518                         break;
519                 case 1:
520                         /* filtered by max_lines */
521                         ++more;
522                         break;
523                 case -1:
524                 default:
525                         /*
526                          * Filtered by min_pcnt or non IP lines when
527                          * context != 0
528                          */
529                         if (!context)
530                                 break;
531                         if (queue_len == context)
532                                 queue = list_entry(queue->node.next, typeof(*queue), node);
533                         else
534                                 ++queue_len;
535                         break;
536                 }
537         }
538 
539         return more;
540 }
541 
542 void symbol__annotate_zero_histogram(struct symbol *sym, int evidx)
543 {
544         struct annotation *notes = symbol__annotation(sym);
545         struct sym_hist *h = annotation__histogram(notes, evidx);
546 
547         memset(h, 0, notes->src->sizeof_sym_hist);
548 }
549 
550 void symbol__annotate_decay_histogram(struct symbol *sym, int evidx)
551 {
552         struct annotation *notes = symbol__annotation(sym);
553         struct sym_hist *h = annotation__histogram(notes, evidx);
554         struct objdump_line *pos;
555         int len = sym->end - sym->start;
556 
557         h->sum = 0;
558 
559         list_for_each_entry(pos, &notes->src->source, node) {
560                 if (pos->offset != -1 && pos->offset < len) {
561                         h->addr[pos->offset] = h->addr[pos->offset] * 7 / 8;
562                         h->sum += h->addr[pos->offset];
563                 }
564         }
565 }
566 
567 void objdump_line_list__purge(struct list_head *head)
568 {
569         struct objdump_line *pos, *n;
570 
571         list_for_each_entry_safe(pos, n, head, node) {
572                 list_del(&pos->node);
573                 objdump_line__free(pos);
574         }
575 }
576 
577 int symbol__tty_annotate(struct symbol *sym, struct map *map, int evidx,
578                          bool print_lines, bool full_paths, int min_pcnt,
579                          int max_lines)
580 {
581         struct dso *dso = map->dso;
582         const char *filename = dso->long_name;
583         struct rb_root source_line = RB_ROOT;
584         u64 len;
585 
586         if (symbol__annotate(sym, map, 0) < 0)
587                 return -1;
588 
589         len = sym->end - sym->start;
590 
591         if (print_lines) {
592                 symbol__get_source_line(sym, map, evidx, &source_line,
593                                         len, filename);
594                 print_summary(&source_line, filename);
595         }
596 
597         symbol__annotate_printf(sym, map, evidx, full_paths,
598                                 min_pcnt, max_lines, 0);
599         if (print_lines)
600                 symbol__free_source_line(sym, len);
601 
602         objdump_line_list__purge(&symbol__annotation(sym)->src->source);
603 
604         return 0;
605 }
606 

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