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(union perf_event *event,
  18                                   struct perf_sample *sample __used,
  19                                   struct perf_session *session)
  20 {
  21         struct addr_location al;
  22         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
  23         struct thread *thread = perf_session__findnew(session, event->ip.pid);
  24
  25         if (thread == NULL) {
  26                 pr_err("problem processing %d event, skipping it.\n",
  27                         event->header.type);
  28                 return -1;
  29         }
  30
  31         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
  32                               event->ip.pid, event->ip.ip, &al);
  33
  34         if (al.map != NULL)
  35                 al.map->dso->hit = 1;
  36
  37         return 0;
  38 }
  39
  40 static int perf_event__exit_del_thread(union perf_event *event,
  41                                        struct perf_sample *sample __used,
  42                                        struct perf_session *session)
  43 {
  44         struct thread *thread = perf_session__findnew(session, event->fork.tid);
  45
  46         dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
  47                     event->fork.ppid, event->fork.ptid);
  48
  49         if (thread) {
  50                 rb_erase(&thread->rb_node, &session->threads);
  51                 session->last_match = NULL;
  52                 thread__delete(thread);
  53         }
  54
  55         return 0;
  56 }
  57
  58 struct perf_event_ops build_id__mark_dso_hit_ops = {
  59         .sample = build_id__mark_dso_hit,
  60         .mmap   = perf_event__process_mmap,
  61         .fork   = perf_event__process_task,
  62         .exit   = perf_event__exit_del_thread,
  63 };
  64
  65 char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
  66 {
  67         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
  68
  69         if (!self->has_build_id)
  70                 return NULL;
  71
  72         build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
  73         if (bf == NULL) {
  74                 if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
  75                              build_id_hex, build_id_hex + 2) < 0)
  76                         return NULL;
  77         } else
  78                 snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
  79                          build_id_hex, build_id_hex + 2);
  80         return bf;
  81 }