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_evsel *evsel __used,
  20                                   struct perf_session *session)
  21 {
  22         struct addr_location al;
  23         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
  24         struct thread *thread = perf_session__findnew(session, event->ip.pid);
  25
  26         if (thread == NULL) {
  27                 pr_err("problem processing %d event, skipping it.\n",
  28                         event->header.type);
  29                 return -1;
  30         }
  31
  32         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
  33                               event->ip.pid, event->ip.ip, &al);
  34
  35         if (al.map != NULL)
  36                 al.map->dso->hit = 1;
  37
  38         return 0;
  39 }
  40
  41 static int perf_event__exit_del_thread(union perf_event *event,
  42                                        struct perf_sample *sample __used,
  43                                        struct perf_session *session)
  44 {
  45         struct thread *thread = perf_session__findnew(session, event->fork.tid);
  46
  47         dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
  48                     event->fork.ppid, event->fork.ptid);
  49
  50         if (thread) {
  51                 rb_erase(&thread->rb_node, &session->threads);
  52                 session->last_match = NULL;
  53                 thread__delete(thread);
  54         }
  55
  56         return 0;
  57 }
  58
  59 struct perf_event_ops build_id__mark_dso_hit_ops = {
  60         .sample = build_id__mark_dso_hit,
  61         .mmap   = perf_event__process_mmap,
  62         .fork   = perf_event__process_task,
  63         .exit   = perf_event__exit_del_thread,
  64 };
  65
  66 char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
  67 {
  68         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
  69
  70         if (!self->has_build_id)
  71                 return NULL;
  72
  73         build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
  74         if (bf == NULL) {
  75                 if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
  76                              build_id_hex, build_id_hex + 2) < 0)
  77                         return NULL;
  78         } else
  79                 snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
  80                          build_id_hex, build_id_hex + 2);
  81         return bf;
  82 }