tools/perf/util/build-id.c

   1 /*
   2  * build-id.c
   3  *
   4  * build-id support
   5  *
   6  * Copyright (C) 2009, 2010 Red Hat Inc.
   7  * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
   8  */
   9 #include "util.h"
  10 #include <stdio.h>
  11 #include "build-id.h"
  12 #include "event.h"
  13 #include "symbol.h"
  14 #include <linux/kernel.h>
  15 #include "debug.h"
  16
  17 static int build_id__mark_dso_hit(event_t *event, struct perf_session *session)
  18 {
  19         struct addr_location al;
  20         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
  21         struct thread *thread = perf_session__findnew(session, event->ip.pid);
  22
  23         if (thread == NULL) {
  24                 pr_err("problem processing %d event, skipping it.\n",
  25                         event->header.type);
  26                 return -1;
  27         }
  28
  29         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
  30                               event->ip.pid, event->ip.ip, &al);
  31
  32         if (al.map != NULL)
  33                 al.map->dso->hit = 1;
  34
  35         return 0;
  36 }
  37
  38 static int event__exit_del_thread(event_t *self, struct perf_session *session)
  39 {
  40         struct thread *thread = perf_session__findnew(session, self->fork.tid);
  41
  42         dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
  43                     self->fork.ppid, self->fork.ptid);
  44
  45         if (thread) {
  46                 rb_erase(&thread->rb_node, &session->threads);
  47                 session->last_match = NULL;
  48                 thread__delete(thread);
  49         }
  50
  51         return 0;
  52 }
  53
  54 struct perf_event_ops build_id__mark_dso_hit_ops = {
  55         .sample = build_id__mark_dso_hit,
  56         .mmap   = event__process_mmap,
  57         .fork   = event__process_task,
  58         .exit   = event__exit_del_thread,
  59 };
  60
  61 char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
  62 {
  63         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
  64
  65         if (!self->has_build_id)
  66                 return NULL;
  67
  68         build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
  69         if (bf == NULL) {
  70                 if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
  71                              build_id_hex, build_id_hex + 2) < 0)
  72                         return NULL;
  73         } else
  74                 snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
  75                          build_id_hex, build_id_hex + 2);
  76         return bf;
  77 }