build-id.c

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/*
 * build-id.c
 *
 * build-id support
 *
 * Copyright (C) 2009, 2010 Red Hat Inc.
 * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <[email protected]>
 */
#include "util.h"
#include <stdio.h>
#include "build-id.h"
#include "event.h"
#include "symbol.h"
#include <linux/kernel.h>
#include "debug.h"
#include "session.h"
#include "tool.h"

static int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
                  union perf_event *event,
                  struct perf_sample *sample __maybe_unused,
                  struct perf_evsel *evsel __maybe_unused,
                  struct machine *machine)
{
    struct addr_location al;
    u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
    struct thread *thread = machine__findnew_thread(machine, event->ip.pid);

    if (thread == NULL) {
        pr_err("problem processing %d event, skipping it.\n",
            event->header.type);
        return -1;
    }

    thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
                  event->ip.ip, &al);

    if (al.map != NULL)
        al.map->dso->hit = 1;

    return 0;
}

static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
                       union perf_event *event,
                       struct perf_sample *sample
                       __maybe_unused,
                       struct machine *machine)
{
    struct thread *thread = machine__findnew_thread(machine, event->fork.tid);

    dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
            event->fork.ppid, event->fork.ptid);

    if (thread) {
        rb_erase(&thread->rb_node, &machine->threads);
        machine->last_match = NULL;
        thread__delete(thread);
    }

    return 0;
}

struct perf_tool build_id__mark_dso_hit_ops = {
    .sample = build_id__mark_dso_hit,
    .mmap   = perf_event__process_mmap,
    .fork   = perf_event__process_task,
    .exit   = perf_event__exit_del_thread,
    .attr        = perf_event__process_attr,
    .build_id    = perf_event__process_build_id,
};

char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
{
    char build_id_hex[BUILD_ID_SIZE * 2 + 1];

    if (!self->has_build_id)
        return NULL;

    build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
    if (bf == NULL) {
        if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
                 build_id_hex, build_id_hex + 2) < 0)
            return NULL;
    } else
        snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
             build_id_hex, build_id_hex + 2);
    return bf;
}