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build-id.c
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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 <[email protected]>
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 #include "tool.h"
18 
19 static int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
20  union perf_event *event,
21  struct perf_sample *sample __maybe_unused,
22  struct perf_evsel *evsel __maybe_unused,
23  struct machine *machine)
24 {
25  struct addr_location al;
26  u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
27  struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
28 
29  if (thread == NULL) {
30  pr_err("problem processing %d event, skipping it.\n",
31  event->header.type);
32  return -1;
33  }
34 
35  thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
36  event->ip.ip, &al);
37 
38  if (al.map != NULL)
39  al.map->dso->hit = 1;
40 
41  return 0;
42 }
43 
44 static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
45  union perf_event *event,
46  struct perf_sample *sample
47  __maybe_unused,
48  struct machine *machine)
49 {
50  struct thread *thread = machine__findnew_thread(machine, event->fork.tid);
51 
52  dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
53  event->fork.ppid, event->fork.ptid);
54 
55  if (thread) {
56  rb_erase(&thread->rb_node, &machine->threads);
57  machine->last_match = NULL;
58  thread__delete(thread);
59  }
60 
61  return 0;
62 }
63 
65  .sample = build_id__mark_dso_hit,
68  .exit = perf_event__exit_del_thread,
70  .build_id = perf_event__process_build_id,
71 };
72 
73 char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
74 {
75  char build_id_hex[BUILD_ID_SIZE * 2 + 1];
76 
77  if (!self->has_build_id)
78  return NULL;
79 
80  build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
81  if (bf == NULL) {
82  if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
83  build_id_hex, build_id_hex + 2) < 0)
84  return NULL;
85  } else
86  snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
87  build_id_hex, build_id_hex + 2);
88  return bf;
89 }