builtin-buildid-list.c

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// SPDX-License-Identifier: GPL-2.0
/*
 * builtin-buildid-list.c
 *
 * Builtin buildid-list command: list buildids in perf.data, in the running
 * kernel and in ELF files.
 *
 * Copyright (C) 2009, Red Hat Inc.
 * Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
 */
#include "builtin.h"
#include "perf.h"
#include "util/build-id.h"
#include "util/cache.h"
#include "util/debug.h"
#include <subcmd/parse-options.h>
#include "util/session.h"
#include "util/symbol.h"
#include "util/data.h"
#include <errno.h>

static int sysfs__fprintf_build_id(FILE *fp)
{
    char sbuild_id[SBUILD_ID_SIZE];
    int ret;

    ret = sysfs__sprintf_build_id("/", sbuild_id);
    if (ret != sizeof(sbuild_id))
        return ret < 0 ? ret : -EINVAL;

    return fprintf(fp, "%s\n", sbuild_id);
}

static int filename__fprintf_build_id(const char *name, FILE *fp)
{
    char sbuild_id[SBUILD_ID_SIZE];
    int ret;

    ret = filename__sprintf_build_id(name, sbuild_id);
    if (ret != sizeof(sbuild_id))
        return ret < 0 ? ret : -EINVAL;

    return fprintf(fp, "%s\n", sbuild_id);
}

static bool dso__skip_buildid(struct dso *dso, int with_hits)
{
    return with_hits && !dso->hit;
}

static int perf_session__list_build_ids(bool force, bool with_hits)
{
    struct perf_session *session;
    struct perf_data data = {
        .file      = {
            .path = input_name,
        },
        .mode      = PERF_DATA_MODE_READ,
        .force     = force,
    };

    symbol__elf_init();
    /*
     * See if this is an ELF file first:
     */
    if (filename__fprintf_build_id(input_name, stdout) > 0)
        goto out;

    session = perf_session__new(&data, false, &build_id__mark_dso_hit_ops);
    if (session == NULL)
        return -1;

    /*
     * We take all buildids when the file contains AUX area tracing data
     * because we do not decode the trace because it would take too long.
     */
    if (!perf_data__is_pipe(&data) &&
        perf_header__has_feat(&session->header, HEADER_AUXTRACE))
        with_hits = false;

    /*
     * in pipe-mode, the only way to get the buildids is to parse
     * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
     */
    if (with_hits || perf_data__is_pipe(&data))
        perf_session__process_events(session);

    perf_session__fprintf_dsos_buildid(session, stdout, dso__skip_buildid, with_hits);
    perf_session__delete(session);
out:
    return 0;
}

int cmd_buildid_list(int argc, const char **argv)
{
    bool show_kernel = false;
    bool with_hits = false;
    bool force = false;
    const struct option options[] = {
    OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
    OPT_STRING('i', "input", &input_name, "file", "input file name"),
    OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
    OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
    OPT_INCR('v', "verbose", &verbose, "be more verbose"),
    OPT_END()
    };
    const char * const buildid_list_usage[] = {
        "perf buildid-list [<options>]",
        NULL
    };

    argc = parse_options(argc, argv, options, buildid_list_usage, 0);
    setup_pager();

    if (show_kernel)
        return !(sysfs__fprintf_build_id(stdout) > 0);

    return perf_session__list_build_ids(force, with_hits);
}