perf hists: Add helper functions for hierarchy mode

The rb_hierarchy_{next,prev,last} functions are to traverse all hist
entries in a hierarchy.  They will be used by various function which
supports hierarchy output.

As the rb_hierarchy_next() is used to traverse the whole hierarchy, it
sometime needs to visit entries regardless of current folding state.  So
add enum hierarchy_move_dir and pass it to __rb_hierarchy_next() for
those cases.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1456326830-30456-5-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 6ddac2f..358af7e 100644 (file)
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1500,6 +1500,62 @@ void hists__output_resort(struct hists *hists, struct ui_progress *prog)
        output_resort(hists, prog, symbol_conf.use_callchain);
 }
 
+static bool can_goto_child(struct hist_entry *he, enum hierarchy_move_dir hmd)
+{
+       if (he->leaf || hmd == HMD_FORCE_SIBLING)
+               return false;
+
+       if (he->unfolded || hmd == HMD_FORCE_CHILD)
+               return true;
+
+       return false;
+}
+
+struct rb_node *rb_hierarchy_last(struct rb_node *node)
+{
+       struct hist_entry *he = rb_entry(node, struct hist_entry, rb_node);
+
+       while (can_goto_child(he, HMD_NORMAL)) {
+               node = rb_last(&he->hroot_out);
+               he = rb_entry(node, struct hist_entry, rb_node);
+       }
+       return node;
+}
+
+struct rb_node *__rb_hierarchy_next(struct rb_node *node, enum hierarchy_move_dir hmd)
+{
+       struct hist_entry *he = rb_entry(node, struct hist_entry, rb_node);
+
+       if (can_goto_child(he, hmd))
+               node = rb_first(&he->hroot_out);
+       else
+               node = rb_next(node);
+
+       while (node == NULL) {
+               he = he->parent_he;
+               if (he == NULL)
+                       break;
+
+               node = rb_next(&he->rb_node);
+       }
+       return node;
+}
+
+struct rb_node *rb_hierarchy_prev(struct rb_node *node)
+{
+       struct hist_entry *he = rb_entry(node, struct hist_entry, rb_node);
+
+       node = rb_prev(node);
+       if (node)
+               return rb_hierarchy_last(node);
+
+       he = he->parent_he;
+       if (he == NULL)
+               return NULL;
+
+       return &he->rb_node;
+}
+
 static void hists__remove_entry_filter(struct hists *hists, struct hist_entry *h,
                                       enum hist_filter filter)
 {

diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 044419b..5690906 100644 (file)
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -418,4 +418,20 @@ int perf_hist_config(const char *var, const char *value);
 
 void perf_hpp_list__init(struct perf_hpp_list *list);
 
+enum hierarchy_move_dir {
+       HMD_NORMAL,
+       HMD_FORCE_SIBLING,
+       HMD_FORCE_CHILD,
+};
+
+struct rb_node *rb_hierarchy_last(struct rb_node *node);
+struct rb_node *__rb_hierarchy_next(struct rb_node *node,
+                                   enum hierarchy_move_dir hmd);
+struct rb_node *rb_hierarchy_prev(struct rb_node *node);
+
+static inline struct rb_node *rb_hierarchy_next(struct rb_node *node)
+{
+       return __rb_hierarchy_next(node, HMD_NORMAL);
+}
+
 #endif /* __PERF_HIST_H */