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Linux/tools/perf/builtin-buildid-list.c

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  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/debug.h"
 14 #include "util/dso.h"
 15 #include <subcmd/pager.h>
 16 #include <subcmd/parse-options.h>
 17 #include "util/session.h"
 18 #include "util/symbol.h"
 19 #include "util/data.h"
 20 #include <errno.h>
 21 #include <linux/err.h>
 22 
 23 static int sysfs__fprintf_build_id(FILE *fp)
 24 {
 25         char sbuild_id[SBUILD_ID_SIZE];
 26         int ret;
 27 
 28         ret = sysfs__sprintf_build_id("/", sbuild_id);
 29         if (ret != sizeof(sbuild_id))
 30                 return ret < 0 ? ret : -EINVAL;
 31 
 32         return fprintf(fp, "%s\n", sbuild_id);
 33 }
 34 
 35 static int filename__fprintf_build_id(const char *name, FILE *fp)
 36 {
 37         char sbuild_id[SBUILD_ID_SIZE];
 38         int ret;
 39 
 40         ret = filename__sprintf_build_id(name, sbuild_id);
 41         if (ret != sizeof(sbuild_id))
 42                 return ret < 0 ? ret : -EINVAL;
 43 
 44         return fprintf(fp, "%s\n", sbuild_id);
 45 }
 46 
 47 static bool dso__skip_buildid(struct dso *dso, int with_hits)
 48 {
 49         return with_hits && !dso->hit;
 50 }
 51 
 52 static int perf_session__list_build_ids(bool force, bool with_hits)
 53 {
 54         struct perf_session *session;
 55         struct perf_data data = {
 56                 .path  = input_name,
 57                 .mode  = PERF_DATA_MODE_READ,
 58                 .force = force,
 59         };
 60 
 61         symbol__elf_init();
 62         /*
 63          * See if this is an ELF file first:
 64          */
 65         if (filename__fprintf_build_id(input_name, stdout) > 0)
 66                 goto out;
 67 
 68         session = perf_session__new(&data, &build_id__mark_dso_hit_ops);
 69         if (IS_ERR(session))
 70                 return PTR_ERR(session);
 71 
 72         /*
 73          * We take all buildids when the file contains AUX area tracing data
 74          * because we do not decode the trace because it would take too long.
 75          */
 76         if (!perf_data__is_pipe(&data) &&
 77             perf_header__has_feat(&session->header, HEADER_AUXTRACE))
 78                 with_hits = false;
 79 
 80         if (!perf_header__has_feat(&session->header, HEADER_BUILD_ID))
 81                 with_hits = true;
 82 
 83         if (zstd_init(&(session->zstd_data), 0) < 0)
 84                 pr_warning("Decompression initialization failed. Reported data may be incomplete.\n");
 85 
 86         /*
 87          * in pipe-mode, the only way to get the buildids is to parse
 88          * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
 89          */
 90         if (with_hits || perf_data__is_pipe(&data))
 91                 perf_session__process_events(session);
 92 
 93         perf_session__fprintf_dsos_buildid(session, stdout, dso__skip_buildid, with_hits);
 94         perf_session__delete(session);
 95 out:
 96         return 0;
 97 }
 98 
 99 int cmd_buildid_list(int argc, const char **argv)
100 {
101         bool show_kernel = false;
102         bool with_hits = false;
103         bool force = false;
104         const struct option options[] = {
105         OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
106         OPT_STRING('i', "input", &input_name, "file", "input file name"),
107         OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
108         OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
109         OPT_INCR('v', "verbose", &verbose, "be more verbose"),
110         OPT_END()
111         };
112         const char * const buildid_list_usage[] = {
113                 "perf buildid-list [<options>]",
114                 NULL
115         };
116 
117         argc = parse_options(argc, argv, options, buildid_list_usage, 0);
118         setup_pager();
119 
120         if (show_kernel)
121                 return !(sysfs__fprintf_build_id(stdout) > 0);
122 
123         return perf_session__list_build_ids(force, with_hits);
124 }
125 

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