perf probe: Add perf_probe_event__copy()

Add perf_probe_event__copy() to copy perf_probe_event data structure and
sub data structures under given source perf_probe_event.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160608092940.3116.18034.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 76 insertions, 3 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 7ae3dd10f147..84f4b2b32ab7 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2030,6 +2030,79 @@ void clear_perf_probe_event(struct perf_probe_event *pev)
         memset(pev, 0, sizeof(*pev));
 }
 
+#define strdup_or_goto(str, label)      \
+({ char *__p = NULL; if (str && !(__p = strdup(str))) goto label; __p; })
+
+static int perf_probe_point__copy(struct perf_probe_point *dst,
+                                  struct perf_probe_point *src)
+{
+        dst->file = strdup_or_goto(src->file, out_err);
+        dst->function = strdup_or_goto(src->function, out_err);
+        dst->lazy_line = strdup_or_goto(src->lazy_line, out_err);
+        dst->line = src->line;
+        dst->retprobe = src->retprobe;
+        dst->offset = src->offset;
+        return 0;
+
+out_err:
+        clear_perf_probe_point(dst);
+        return -ENOMEM;
+}
+
+static int perf_probe_arg__copy(struct perf_probe_arg *dst,
+                                struct perf_probe_arg *src)
+{
+        struct perf_probe_arg_field *field, **ppfield;
+
+        dst->name = strdup_or_goto(src->name, out_err);
+        dst->var = strdup_or_goto(src->var, out_err);
+        dst->type = strdup_or_goto(src->type, out_err);
+
+        field = src->field;
+        ppfield = &(dst->field);
+        while (field) {
+                *ppfield = zalloc(sizeof(*field));
+                if (!*ppfield)
+                        goto out_err;
+                (*ppfield)->name = strdup_or_goto(field->name, out_err);
+                (*ppfield)->index = field->index;
+                (*ppfield)->ref = field->ref;
+                field = field->next;
+                ppfield = &((*ppfield)->next);
+        }
+        return 0;
+out_err:
+        return -ENOMEM;
+}
+
+int perf_probe_event__copy(struct perf_probe_event *dst,
+                           struct perf_probe_event *src)
+{
+        int i;
+
+        dst->event = strdup_or_goto(src->event, out_err);
+        dst->group = strdup_or_goto(src->group, out_err);
+        dst->target = strdup_or_goto(src->target, out_err);
+        dst->uprobes = src->uprobes;
+
+        if (perf_probe_point__copy(&dst->point, &src->point) < 0)
+                goto out_err;
+
+        dst->args = zalloc(sizeof(struct perf_probe_arg) * src->nargs);
+        if (!dst->args)
+                goto out_err;
+        dst->nargs = src->nargs;
+
+        for (i = 0; i < src->nargs; i++)
+                if (perf_probe_arg__copy(&dst->args[i], &src->args[i]) < 0)
+                        goto out_err;
+        return 0;
+
+out_err:
+        clear_perf_probe_event(dst);
+        return -ENOMEM;
+}
+
 void clear_probe_trace_event(struct probe_trace_event *tev)
 {
         struct probe_trace_arg_ref *ref, *next;
@@ -2505,9 +2578,6 @@ static int find_probe_functions(struct map *map, char *name,
         return found;
 }
 
-#define strdup_or_goto(str, label)      \
-        ({ char *__p = strdup(str); if (!__p) goto label; __p; })
-
 void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
                                 struct probe_trace_event *tev __maybe_unused,
                                 struct map *map __maybe_unused,
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 5a27eb4fad05..367f886cfe00 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -122,6 +122,9 @@ char *synthesize_perf_probe_command(struct perf_probe_event *pev);
 char *synthesize_probe_trace_command(struct probe_trace_event *tev);
 char *synthesize_perf_probe_arg(struct perf_probe_arg *pa);
 
+int perf_probe_event__copy(struct perf_probe_event *dst,
+                           struct perf_probe_event *src);
+
 /* Check the perf_probe_event needs debuginfo */
 bool perf_probe_event_need_dwarf(struct perf_probe_event *pev);