Root/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
21static const char *input_name;
22static bool force;
23static bool show_kernel;
24static bool with_hits;
25
26static const char * const buildid_list_usage[] = {
27    "perf buildid-list [<options>]",
28    NULL
29};
30
31static 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
42static 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
57static 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
70static 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);
95out:
96    perf_session__delete(session);
97    return 0;
98}
99
100static 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
108int 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}
114

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