1 files changed, 140 insertions, 0 deletions
diff --git a/tools/perf/util/rblist.c b/tools/perf/util/rblist.c
new file mode 100644
index 000000000..f399b7ec4
--- /dev/null
+++ b/tools/perf/util/rblist.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Based on strlist.c by:
+ * (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "rblist.h"
+
+int rblist__add_node(struct rblist *rblist, const void *new_entry)
+{
+	struct rb_node **p = &rblist->entries.rb_root.rb_node;
+	struct rb_node *parent = NULL, *new_node;
+	bool leftmost = true;
+
+	while (*p != NULL) {
+		int rc;
+
+		parent = *p;
+
+		rc = rblist->node_cmp(parent, new_entry);
+		if (rc > 0)
+			p = &(*p)->rb_left;
+		else if (rc < 0) {
+			p = &(*p)->rb_right;
+			leftmost = false;
+		}
+		else
+			return -EEXIST;
+	}
+
+	new_node = rblist->node_new(rblist, new_entry);
+	if (new_node == NULL)
+		return -ENOMEM;
+
+	rb_link_node(new_node, parent, p);
+	rb_insert_color_cached(new_node, &rblist->entries, leftmost);
+	++rblist->nr_entries;
+
+	return 0;
+}
+
+void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
+{
+	rb_erase_cached(rb_node, &rblist->entries);
+	--rblist->nr_entries;
+	rblist->node_delete(rblist, rb_node);
+}
+
+static struct rb_node *__rblist__findnew(struct rblist *rblist,
+					 const void *entry,
+					 bool create)
+{
+	struct rb_node **p = &rblist->entries.rb_root.rb_node;
+	struct rb_node *parent = NULL, *new_node = NULL;
+	bool leftmost = true;
+
+	while (*p != NULL) {
+		int rc;
+
+		parent = *p;
+
+		rc = rblist->node_cmp(parent, entry);
+		if (rc > 0)
+			p = &(*p)->rb_left;
+		else if (rc < 0) {
+			p = &(*p)->rb_right;
+			leftmost = false;
+		}
+		else
+			return parent;
+	}
+
+	if (create) {
+		new_node = rblist->node_new(rblist, entry);
+		if (new_node) {
+			rb_link_node(new_node, parent, p);
+			rb_insert_color_cached(new_node,
+					       &rblist->entries, leftmost);
+			++rblist->nr_entries;
+		}
+	}
+
+	return new_node;
+}
+
+struct rb_node *rblist__find(struct rblist *rblist, const void *entry)
+{
+	return __rblist__findnew(rblist, entry, false);
+}
+
+struct rb_node *rblist__findnew(struct rblist *rblist, const void *entry)
+{
+	return __rblist__findnew(rblist, entry, true);
+}
+
+void rblist__init(struct rblist *rblist)
+{
+	if (rblist != NULL) {
+		rblist->entries	 = RB_ROOT_CACHED;
+		rblist->nr_entries = 0;
+	}
+
+	return;
+}
+
+void rblist__exit(struct rblist *rblist)
+{
+	struct rb_node *pos, *next = rb_first_cached(&rblist->entries);
+
+	while (next) {
+		pos = next;
+		next = rb_next(pos);
+		rblist__remove_node(rblist, pos);
+	}
+}
+
+void rblist__delete(struct rblist *rblist)
+{
+	if (rblist != NULL) {
+		rblist__exit(rblist);
+		free(rblist);
+	}
+}
+
+struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
+{
+	struct rb_node *node;
+
+	for (node = rb_first_cached(&rblist->entries); node;
+	     node = rb_next(node)) {
+		if (!idx--)
+			return node;
+	}
+
+	return NULL;
+}