tools/perf/builtin-buildid-list.c

   1 /*
   2  * builtin-buildid-list.c
   3  *
   4  * Builtin buildid-list command: list buildids in perf.data, in the running
   5  * kernel and in ELF files.
   6  *
   7  * Copyright (C) 2009, Red Hat Inc.
   8  * Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
   9  */
  10 #include "builtin.h"
  11 #include "perf.h"
  12 #include "util/build-id.h"
  13 #include "util/cache.h"
  14 #include "util/debug.h"
  15 #include "util/parse-options.h"
  16 #include "util/session.h"
  17 #include "util/symbol.h"
  18
  19 #include <libelf.h>
  20
  21 static const char *input_name;
  22 static bool force;
  23 static bool show_kernel;
  24 static bool with_hits;
  25
  26 static const char * const buildid_list_usage[] = {
  27         "perf buildid-list [<options>]",
  28         NULL
  29 };
  30
  31 static const struct option options[] = {
  32         OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
  33         OPT_STRING('i', "input", &input_name, "file",
  34                     "input file name"),
  35         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
  36         OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
  37         OPT_INCR('v', "verbose", &verbose,
  38                     "be more verbose"),
  39         OPT_END()
  40 };
  41
  42 static int sysfs__fprintf_build_id(FILE *fp)
  43 {
  44         u8 kallsyms_build_id[BUILD_ID_SIZE];
  45         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
  46
  47         if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
  48                                  sizeof(kallsyms_build_id)) != 0)
  49                 return -1;
  50
  51         build_id__sprintf(kallsyms_build_id, sizeof(kallsyms_build_id),
  52                           sbuild_id);
  53         fprintf(fp, "%s\n", sbuild_id);
  54         return 0;
  55 }
  56
  57 static int filename__fprintf_build_id(const char *name, FILE *fp)
  58 {
  59         u8 build_id[BUILD_ID_SIZE];
  60         char sbuild_id[BUILD_ID_SIZE * 2 + 1];
  61
  62         if (filename__read_build_id(name, build_id,
  63                                     sizeof(build_id)) != sizeof(build_id))
  64                 return 0;
  65
  66         build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
  67         return fprintf(fp, "%s\n", sbuild_id);
  68 }
  69
  70 static int perf_session__list_build_ids(void)
  71 {
  72         struct perf_session *session;
  73
  74         elf_version(EV_CURRENT);
  75
  76         session = perf_session__new(input_name, O_RDONLY, force, false,
  77                                     &build_id__mark_dso_hit_ops);
  78         if (session == NULL)
  79                 return -1;
  80
  81         /*
  82          * See if this is an ELF file first:
  83          */
  84         if (filename__fprintf_build_id(session->filename, stdout))
  85                 goto out;
  86
  87         /*
  88          * in pipe-mode, the only way to get the buildids is to parse
  89          * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
  90          */
  91         if (with_hits || session->fd_pipe)
  92                 perf_session__process_events(session, &build_id__mark_dso_hit_ops);
  93
  94         perf_session__fprintf_dsos_buildid(session, stdout, with_hits);
  95 out:
  96         perf_session__delete(session);
  97         return 0;
  98 }
  99
 100 static int __cmd_buildid_list(void)
 101 {
 102         if (show_kernel)
 103                 return sysfs__fprintf_build_id(stdout);
 104
 105         return perf_session__list_build_ids();
 106 }
 107
 108 int cmd_buildid_list(int argc, const char **argv, const char *prefix __used)
 109 {
 110         argc = parse_options(argc, argv, options, buildid_list_usage, 0);
 111         setup_pager();
 112         return __cmd_buildid_list();
 113 }