perf tools: Support for DWARF CFI unwinding on post processing

This brings the support for DWARF cfi unwinding on perf post
processing. Call frame informations are retrieved and then passed
to libunwind that requests memory and register content from the
applications.

Adding unwind object to handle the user stack backtrace based
on the user register values and user stack dump.

The unwind object access the libunwind via remote interface
and provides to it all the necessary data to unwind the stack.

The unwind interface provides following function:
	unwind__get_entries

And callback (specified in above function) to retrieve
the backtrace entries:
	typedef int (*unwind_entry_cb_t)(struct unwind_entry *entry,
					 void *arg);

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Original-patch-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Ulrich Drepper <drepper@gmail.com>
Link: http://lkml.kernel.org/r/1344345647-11536-12-git-send-email-jolsa@redhat.com
[ Replaced use of perf_session by usage of perf_evsel ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 9 insertions, 9 deletions

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 7c88a243b5db..d61825371adc 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -69,8 +69,8 @@ static int perf_report__add_branch_hist_entry(struct perf_tool *tool,
 
         if ((sort__has_parent || symbol_conf.use_callchain)
             && sample->callchain) {
-                err = machine__resolve_callchain(machine, al->thread,
-                                                 sample->callchain, &parent);
+                err = machine__resolve_callchain(machine, evsel, al->thread,
+                                                 sample, &parent);
                 if (err)
                         return err;
         }
@@ -140,8 +140,8 @@ static int perf_evsel__add_hist_entry(struct perf_evsel *evsel,
         struct hist_entry *he;
 
         if ((sort__has_parent || symbol_conf.use_callchain) && sample->callchain) {
-                err = machine__resolve_callchain(machine, al->thread,
-                                                 sample->callchain, &parent);
+                err = machine__resolve_callchain(machine, evsel, al->thread,
+                                                 sample, &parent);
                 if (err)
                         return err;
         }
@@ -397,17 +397,17 @@ static int __cmd_report(struct perf_report *rep)
                 desc);
         }
 
-        if (dump_trace) {
-                perf_session__fprintf_nr_events(session, stdout);
-                goto out_delete;
-        }
-
         if (verbose > 3)
                 perf_session__fprintf(session, stdout);
 
         if (verbose > 2)
                 perf_session__fprintf_dsos(session, stdout);
 
+        if (dump_trace) {
+                perf_session__fprintf_nr_events(session, stdout);
+                goto out_delete;
+        }
+
         nr_samples = 0;
         list_for_each_entry(pos, &session->evlist->entries, node) {
                 struct hists *hists = &pos->hists;