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 #include "session.h"
  17
  18 static int build_id__mark_dso_hit(struct perf_event_ops *ops __used,
  19                                   union perf_event *event,
  20                                   struct perf_sample *sample __used,
  21                                   struct perf_evsel *evsel __used,
  22                                   struct perf_session *session)
  23 {
  24         struct addr_location al;
  25         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
  26         struct thread *thread = perf_session__findnew(session, event->ip.pid);
  27
  28         if (thread == NULL) {
  29                 pr_err("problem processing %d event, skipping it.\n",
  30                         event->header.type);
  31                 return -1;
  32         }
  33
  34         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
  35                               event->ip.pid, event->ip.ip, &al);
  36
  37         if (al.map != NULL)
  38                 al.map->dso->hit = 1;
  39
  40         return 0;
  41 }
  42
  43 static int perf_event__exit_del_thread(struct perf_event_ops *ops __used,
  44                                        union perf_event *event,
  45                                        struct perf_sample *sample __used,
  46                                        struct perf_session *session)
  47 {
  48         struct thread *thread = perf_session__findnew(session, event->fork.tid);
  49
  50         dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
  51                     event->fork.ppid, event->fork.ptid);
  52
  53         if (thread) {
  54                 rb_erase(&thread->rb_node, &session->host_machine.threads);
  55                 session->host_machine.last_match = NULL;
  56                 thread__delete(thread);
  57         }
  58
  59         return 0;
  60 }
  61
  62 struct perf_event_ops build_id__mark_dso_hit_ops = {
  63         .sample = build_id__mark_dso_hit,
  64         .mmap   = perf_event__process_mmap,
  65         .fork   = perf_event__process_task,
  66         .exit   = perf_event__exit_del_thread,
  67 };
  68
  69 char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
  70 {
  71         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
  72
  73         if (!self->has_build_id)
  74                 return NULL;
  75
  76         build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
  77         if (bf == NULL) {
  78                 if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
  79                              build_id_hex, build_id_hex + 2) < 0)
  80                         return NULL;
  81         } else
  82                 snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
  83                          build_id_hex, build_id_hex + 2);
  84         return bf;
  85 }