builtin-annotate.c 9.3 KB
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/*
 * builtin-annotate.c
 *
 * Builtin annotate command: Analyze the perf.data input file,
 * look up and read DSOs and symbol information and display
 * a histogram of results, along various sorting keys.
 */
#include "builtin.h"

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#include "util/util.h"
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#include "util/color.h"
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#include <linux/list.h>
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#include "util/cache.h"
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#include <linux/rbtree.h>
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#include "util/symbol.h"

#include "perf.h"
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#include "util/debug.h"
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#include "util/evlist.h"
#include "util/evsel.h"
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#include "util/annotate.h"
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#include "util/event.h"
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#include "util/parse-options.h"
#include "util/parse-events.h"
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#include "util/thread.h"
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#include "util/sort.h"
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#include "util/hist.h"
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#include "util/session.h"
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#include "util/tool.h"
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#include "arch/common.h"
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#include <linux/bitmap.h>

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struct perf_annotate {
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	struct perf_tool tool;
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	bool	   force, use_tui, use_stdio, use_gtk;
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	bool	   full_paths;
	bool	   print_line;
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	bool	   skip_missing;
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	const char *sym_hist_filter;
	const char *cpu_list;
	DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
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};
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static int perf_evsel__add_sample(struct perf_evsel *evsel,
				  struct perf_sample *sample,
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				  struct addr_location *al,
				  struct perf_annotate *ann)
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{
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	struct hist_entry *he;
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	int ret;
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	if (ann->sym_hist_filter != NULL &&
	    (al->sym == NULL ||
	     strcmp(ann->sym_hist_filter, al->sym->name) != 0)) {
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		/* We're only interested in a symbol named sym_hist_filter */
		if (al->sym != NULL) {
			rb_erase(&al->sym->rb_node,
				 &al->map->dso->symbols[al->map->type]);
			symbol__delete(al->sym);
		}
		return 0;
	}

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	he = __hists__add_entry(&evsel->hists, al, NULL, 1, 1, 0);
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	if (he == NULL)
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		return -ENOMEM;
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	ret = 0;
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	if (he->ms.sym != NULL) {
		struct annotation *notes = symbol__annotation(he->ms.sym);
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		if (notes->src == NULL && symbol__alloc_hist(he->ms.sym) < 0)
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			return -ENOMEM;

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		ret = hist_entry__inc_addr_samples(he, evsel->idx, al->addr);
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	}

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	evsel->hists.stats.total_period += sample->period;
	hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
	return ret;
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}

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static int process_sample_event(struct perf_tool *tool,
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				union perf_event *event,
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				struct perf_sample *sample,
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				struct perf_evsel *evsel,
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				struct machine *machine)
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{
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	struct perf_annotate *ann = container_of(tool, struct perf_annotate, tool);
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	struct addr_location al;
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	if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
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		pr_warning("problem processing %d event, skipping it.\n",
			   event->header.type);
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		return -1;
	}

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	if (ann->cpu_list && !test_bit(sample->cpu, ann->cpu_bitmap))
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		return 0;

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	if (!al.filtered && perf_evsel__add_sample(evsel, sample, &al, ann)) {
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		pr_warning("problem incrementing symbol count, "
			   "skipping event\n");
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		return -1;
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	}

	return 0;
}

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static int hist_entry__tty_annotate(struct hist_entry *he,
				    struct perf_evsel *evsel,
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				    struct perf_annotate *ann)
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{
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	return symbol__tty_annotate(he->ms.sym, he->ms.map, evsel,
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				    ann->print_line, ann->full_paths, 0, 0);
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}

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static void hists__find_annotations(struct hists *self,
				    struct perf_evsel *evsel,
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				    struct perf_annotate *ann)
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{
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	struct rb_node *nd = rb_first(&self->entries), *next;
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	int key = K_RIGHT;
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	while (nd) {
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		struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
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		struct annotation *notes;
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		if (he->ms.sym == NULL || he->ms.map->dso->annotate_warned)
			goto find_next;
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		notes = symbol__annotation(he->ms.sym);
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		if (notes->src == NULL) {
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find_next:
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			if (key == K_LEFT)
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				nd = rb_prev(nd);
			else
				nd = rb_next(nd);
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			continue;
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		}
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		if (use_browser == 2) {
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			int ret;

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			ret = hist_entry__gtk_annotate(he, evsel, NULL);
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			if (!ret || !ann->skip_missing)
				return;

			/* skip missing symbols */
			nd = rb_next(nd);
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		} else if (use_browser == 1) {
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			key = hist_entry__tui_annotate(he, evsel, NULL);
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			switch (key) {
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			case -1:
				if (!ann->skip_missing)
					return;
				/* fall through */
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			case K_RIGHT:
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				next = rb_next(nd);
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				break;
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			case K_LEFT:
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				next = rb_prev(nd);
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				break;
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			default:
				return;
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			}
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			if (next != NULL)
				nd = next;
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		} else {
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			hist_entry__tty_annotate(he, evsel, ann);
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			nd = rb_next(nd);
			/*
			 * Since we have a hist_entry per IP for the same
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			 * symbol, free he->ms.sym->src to signal we already
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			 * processed this symbol.
			 */
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			free(notes->src);
			notes->src = NULL;
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		}
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	}
}

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static int __cmd_annotate(struct perf_annotate *ann)
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{
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	int ret;
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	struct perf_session *session;
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	struct perf_evsel *pos;
	u64 total_nr_samples;
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	session = perf_session__new(input_name, O_RDONLY,
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				    ann->force, false, &ann->tool);
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	if (session == NULL)
		return -ENOMEM;

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	machines__set_symbol_filter(&session->machines, symbol__annotate_init);

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	if (ann->cpu_list) {
		ret = perf_session__cpu_bitmap(session, ann->cpu_list,
					       ann->cpu_bitmap);
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		if (ret)
			goto out_delete;
	}

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	if (!objdump_path) {
		ret = perf_session_env__lookup_objdump(&session->header.env);
		if (ret)
			goto out_delete;
	}

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	ret = perf_session__process_events(session, &ann->tool);
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	if (ret)
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		goto out_delete;
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	if (dump_trace) {
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		perf_session__fprintf_nr_events(session, stdout);
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		goto out_delete;
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	}
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	if (verbose > 3)
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		perf_session__fprintf(session, stdout);
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	if (verbose > 2)
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		perf_session__fprintf_dsos(session, stdout);
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	total_nr_samples = 0;
	list_for_each_entry(pos, &session->evlist->entries, node) {
		struct hists *hists = &pos->hists;
		u32 nr_samples = hists->stats.nr_events[PERF_RECORD_SAMPLE];

		if (nr_samples > 0) {
			total_nr_samples += nr_samples;
			hists__collapse_resort(hists);
			hists__output_resort(hists);
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			if (symbol_conf.event_group &&
			    !perf_evsel__is_group_leader(pos))
				continue;

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			hists__find_annotations(hists, pos, ann);
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		}
	}
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	if (total_nr_samples == 0) {
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		ui__error("The %s file has no samples!\n", session->filename);
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		goto out_delete;
	}
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	if (use_browser == 2)
		perf_gtk__show_annotations();

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out_delete:
	/*
	 * Speed up the exit process, for large files this can
	 * take quite a while.
	 *
	 * XXX Enable this when using valgrind or if we ever
	 * librarize this command.
	 *
	 * Also experiment with obstacks to see how much speed
	 * up we'll get here.
	 *
	 * perf_session__delete(session);
	 */
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	return ret;
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}

static const char * const annotate_usage[] = {
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	"perf annotate [<options>]",
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	NULL
};

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int cmd_annotate(int argc, const char **argv, const char *prefix __maybe_unused)
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{
	struct perf_annotate annotate = {
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		.tool = {
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			.sample	= process_sample_event,
			.mmap	= perf_event__process_mmap,
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			.mmap2	= perf_event__process_mmap2,
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			.comm	= perf_event__process_comm,
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			.exit	= perf_event__process_exit,
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			.fork	= perf_event__process_fork,
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			.ordered_samples = true,
			.ordering_requires_timestamps = true,
		},
	};
	const struct option options[] = {
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	OPT_STRING('i', "input", &input_name, "file",
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		    "input file name"),
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	OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
		   "only consider symbols in these dsos"),
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	OPT_STRING('s', "symbol", &annotate.sym_hist_filter, "symbol",
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		    "symbol to annotate"),
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	OPT_BOOLEAN('f', "force", &annotate.force, "don't complain, do it"),
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	OPT_INCR('v', "verbose", &verbose,
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		    "be more verbose (show symbol address, etc)"),
	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
		    "dump raw trace in ASCII"),
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	OPT_BOOLEAN(0, "gtk", &annotate.use_gtk, "Use the GTK interface"),
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	OPT_BOOLEAN(0, "tui", &annotate.use_tui, "Use the TUI interface"),
	OPT_BOOLEAN(0, "stdio", &annotate.use_stdio, "Use the stdio interface"),
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	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
		   "file", "vmlinux pathname"),
	OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
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		    "load module symbols - WARNING: use only with -k and LIVE kernel"),
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	OPT_BOOLEAN('l', "print-line", &annotate.print_line,
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		    "print matching source lines (may be slow)"),
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	OPT_BOOLEAN('P', "full-paths", &annotate.full_paths,
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		    "Don't shorten the displayed pathnames"),
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	OPT_BOOLEAN(0, "skip-missing", &annotate.skip_missing,
		    "Skip symbols that cannot be annotated"),
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	OPT_STRING('C', "cpu", &annotate.cpu_list, "cpu", "list of cpus to profile"),
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	OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
		   "Look for files with symbols relative to this directory"),
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	OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
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		    "Interleave source code with assembly code (default)"),
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	OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
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		    "Display raw encoding of assembly instructions (default)"),
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	OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
		   "Specify disassembler style (e.g. -M intel for intel syntax)"),
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	OPT_STRING(0, "objdump", &objdump_path, "path",
		   "objdump binary to use for disassembly and annotations"),
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	OPT_BOOLEAN(0, "group", &symbol_conf.event_group,
		    "Show event group information together"),
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	OPT_END()
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	};
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	argc = parse_options(argc, argv, options, annotate_usage, 0);

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	if (annotate.use_stdio)
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		use_browser = 0;
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	else if (annotate.use_tui)
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		use_browser = 1;
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	else if (annotate.use_gtk)
		use_browser = 2;
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	setup_browser(true);
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	symbol_conf.priv_size = sizeof(struct annotation);
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	symbol_conf.try_vmlinux_path = true;

	if (symbol__init() < 0)
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		return -1;
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	if (setup_sorting() < 0)
		usage_with_options(annotate_usage, options);
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	if (argc) {
		/*
		 * Special case: if there's an argument left then assume tha
		 * it's a symbol filter:
		 */
		if (argc > 1)
			usage_with_options(annotate_usage, options);

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		annotate.sym_hist_filter = argv[0];
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	}

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	return __cmd_annotate(&annotate);
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}